Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1 | /* |
Divy Le Ray | a02d44a | 2008-10-13 18:47:30 -0700 | [diff] [blame] | 2 | * Copyright (c) 2005-2008 Chelsio, Inc. All rights reserved. |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3 | * |
Divy Le Ray | 1d68e93 | 2007-01-30 19:44:35 -0800 | [diff] [blame] | 4 | * This software is available to you under a choice of one of two |
| 5 | * licenses. You may choose to be licensed under the terms of the GNU |
| 6 | * General Public License (GPL) Version 2, available from the file |
| 7 | * COPYING in the main directory of this source tree, or the |
| 8 | * OpenIB.org BSD license below: |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 9 | * |
Divy Le Ray | 1d68e93 | 2007-01-30 19:44:35 -0800 | [diff] [blame] | 10 | * Redistribution and use in source and binary forms, with or |
| 11 | * without modification, are permitted provided that the following |
| 12 | * conditions are met: |
| 13 | * |
| 14 | * - Redistributions of source code must retain the above |
| 15 | * copyright notice, this list of conditions and the following |
| 16 | * disclaimer. |
| 17 | * |
| 18 | * - Redistributions in binary form must reproduce the above |
| 19 | * copyright notice, this list of conditions and the following |
| 20 | * disclaimer in the documentation and/or other materials |
| 21 | * provided with the distribution. |
| 22 | * |
| 23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| 27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 30 | * SOFTWARE. |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 31 | */ |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 32 | #include <linux/skbuff.h> |
| 33 | #include <linux/netdevice.h> |
| 34 | #include <linux/etherdevice.h> |
| 35 | #include <linux/if_vlan.h> |
| 36 | #include <linux/ip.h> |
| 37 | #include <linux/tcp.h> |
| 38 | #include <linux/dma-mapping.h> |
Karen Xie | a109a5b | 2008-12-18 22:56:20 -0800 | [diff] [blame] | 39 | #include <net/arp.h> |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 40 | #include "common.h" |
| 41 | #include "regs.h" |
| 42 | #include "sge_defs.h" |
| 43 | #include "t3_cpl.h" |
| 44 | #include "firmware_exports.h" |
| 45 | |
| 46 | #define USE_GTS 0 |
| 47 | |
| 48 | #define SGE_RX_SM_BUF_SIZE 1536 |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 49 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 50 | #define SGE_RX_COPY_THRES 256 |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 51 | #define SGE_RX_PULL_LEN 128 |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 52 | |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 53 | #define SGE_PG_RSVD SMP_CACHE_BYTES |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 54 | /* |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 55 | * Page chunk size for FL0 buffers if FL0 is to be populated with page chunks. |
| 56 | * It must be a divisor of PAGE_SIZE. If set to 0 FL0 will use sk_buffs |
| 57 | * directly. |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 58 | */ |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 59 | #define FL0_PG_CHUNK_SIZE 2048 |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 60 | #define FL0_PG_ORDER 0 |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 61 | #define FL0_PG_ALLOC_SIZE (PAGE_SIZE << FL0_PG_ORDER) |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 62 | #define FL1_PG_CHUNK_SIZE (PAGE_SIZE > 8192 ? 16384 : 8192) |
| 63 | #define FL1_PG_ORDER (PAGE_SIZE > 8192 ? 0 : 1) |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 64 | #define FL1_PG_ALLOC_SIZE (PAGE_SIZE << FL1_PG_ORDER) |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 65 | |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 66 | #define SGE_RX_DROP_THRES 16 |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 67 | #define RX_RECLAIM_PERIOD (HZ/4) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 68 | |
| 69 | /* |
Divy Le Ray | 26b3871 | 2009-03-12 21:13:43 +0000 | [diff] [blame] | 70 | * Max number of Rx buffers we replenish at a time. |
| 71 | */ |
| 72 | #define MAX_RX_REFILL 16U |
| 73 | /* |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 74 | * Period of the Tx buffer reclaim timer. This timer does not need to run |
| 75 | * frequently as Tx buffers are usually reclaimed by new Tx packets. |
| 76 | */ |
| 77 | #define TX_RECLAIM_PERIOD (HZ / 4) |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 78 | #define TX_RECLAIM_TIMER_CHUNK 64U |
| 79 | #define TX_RECLAIM_CHUNK 16U |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 80 | |
| 81 | /* WR size in bytes */ |
| 82 | #define WR_LEN (WR_FLITS * 8) |
| 83 | |
| 84 | /* |
| 85 | * Types of Tx queues in each queue set. Order here matters, do not change. |
| 86 | */ |
| 87 | enum { TXQ_ETH, TXQ_OFLD, TXQ_CTRL }; |
| 88 | |
| 89 | /* Values for sge_txq.flags */ |
| 90 | enum { |
| 91 | TXQ_RUNNING = 1 << 0, /* fetch engine is running */ |
| 92 | TXQ_LAST_PKT_DB = 1 << 1, /* last packet rang the doorbell */ |
| 93 | }; |
| 94 | |
| 95 | struct tx_desc { |
Al Viro | fb8e444 | 2007-08-23 03:04:12 -0400 | [diff] [blame] | 96 | __be64 flit[TX_DESC_FLITS]; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 97 | }; |
| 98 | |
| 99 | struct rx_desc { |
| 100 | __be32 addr_lo; |
| 101 | __be32 len_gen; |
| 102 | __be32 gen2; |
| 103 | __be32 addr_hi; |
| 104 | }; |
| 105 | |
| 106 | struct tx_sw_desc { /* SW state per Tx descriptor */ |
| 107 | struct sk_buff *skb; |
Divy Le Ray | 23561c9 | 2007-11-16 11:22:05 -0800 | [diff] [blame] | 108 | u8 eop; /* set if last descriptor for packet */ |
| 109 | u8 addr_idx; /* buffer index of first SGL entry in descriptor */ |
| 110 | u8 fragidx; /* first page fragment associated with descriptor */ |
| 111 | s8 sflit; /* start flit of first SGL entry in descriptor */ |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 112 | }; |
| 113 | |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 114 | struct rx_sw_desc { /* SW state per Rx descriptor */ |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 115 | union { |
| 116 | struct sk_buff *skb; |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 117 | struct fl_pg_chunk pg_chunk; |
| 118 | }; |
| 119 | DECLARE_PCI_UNMAP_ADDR(dma_addr); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 120 | }; |
| 121 | |
| 122 | struct rsp_desc { /* response queue descriptor */ |
| 123 | struct rss_header rss_hdr; |
| 124 | __be32 flags; |
| 125 | __be32 len_cq; |
| 126 | u8 imm_data[47]; |
| 127 | u8 intr_gen; |
| 128 | }; |
| 129 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 130 | /* |
Divy Le Ray | 99d7cf3 | 2007-02-24 16:44:06 -0800 | [diff] [blame] | 131 | * Holds unmapping information for Tx packets that need deferred unmapping. |
| 132 | * This structure lives at skb->head and must be allocated by callers. |
| 133 | */ |
| 134 | struct deferred_unmap_info { |
| 135 | struct pci_dev *pdev; |
| 136 | dma_addr_t addr[MAX_SKB_FRAGS + 1]; |
| 137 | }; |
| 138 | |
| 139 | /* |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 140 | * Maps a number of flits to the number of Tx descriptors that can hold them. |
| 141 | * The formula is |
| 142 | * |
| 143 | * desc = 1 + (flits - 2) / (WR_FLITS - 1). |
| 144 | * |
| 145 | * HW allows up to 4 descriptors to be combined into a WR. |
| 146 | */ |
| 147 | static u8 flit_desc_map[] = { |
| 148 | 0, |
| 149 | #if SGE_NUM_GENBITS == 1 |
| 150 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 151 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, |
| 152 | 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, |
| 153 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 |
| 154 | #elif SGE_NUM_GENBITS == 2 |
| 155 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 156 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, |
| 157 | 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, |
| 158 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, |
| 159 | #else |
| 160 | # error "SGE_NUM_GENBITS must be 1 or 2" |
| 161 | #endif |
| 162 | }; |
| 163 | |
| 164 | static inline struct sge_qset *fl_to_qset(const struct sge_fl *q, int qidx) |
| 165 | { |
| 166 | return container_of(q, struct sge_qset, fl[qidx]); |
| 167 | } |
| 168 | |
| 169 | static inline struct sge_qset *rspq_to_qset(const struct sge_rspq *q) |
| 170 | { |
| 171 | return container_of(q, struct sge_qset, rspq); |
| 172 | } |
| 173 | |
| 174 | static inline struct sge_qset *txq_to_qset(const struct sge_txq *q, int qidx) |
| 175 | { |
| 176 | return container_of(q, struct sge_qset, txq[qidx]); |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * refill_rspq - replenish an SGE response queue |
| 181 | * @adapter: the adapter |
| 182 | * @q: the response queue to replenish |
| 183 | * @credits: how many new responses to make available |
| 184 | * |
| 185 | * Replenishes a response queue by making the supplied number of responses |
| 186 | * available to HW. |
| 187 | */ |
| 188 | static inline void refill_rspq(struct adapter *adapter, |
| 189 | const struct sge_rspq *q, unsigned int credits) |
| 190 | { |
Divy Le Ray | afefce6 | 2007-11-16 11:22:21 -0800 | [diff] [blame] | 191 | rmb(); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 192 | t3_write_reg(adapter, A_SG_RSPQ_CREDIT_RETURN, |
| 193 | V_RSPQ(q->cntxt_id) | V_CREDITS(credits)); |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * need_skb_unmap - does the platform need unmapping of sk_buffs? |
| 198 | * |
| 199 | * Returns true if the platfrom needs sk_buff unmapping. The compiler |
| 200 | * optimizes away unecessary code if this returns true. |
| 201 | */ |
| 202 | static inline int need_skb_unmap(void) |
| 203 | { |
| 204 | /* |
| 205 | * This structure is used to tell if the platfrom needs buffer |
| 206 | * unmapping by checking if DECLARE_PCI_UNMAP_ADDR defines anything. |
| 207 | */ |
| 208 | struct dummy { |
| 209 | DECLARE_PCI_UNMAP_ADDR(addr); |
| 210 | }; |
| 211 | |
| 212 | return sizeof(struct dummy) != 0; |
| 213 | } |
| 214 | |
| 215 | /** |
| 216 | * unmap_skb - unmap a packet main body and its page fragments |
| 217 | * @skb: the packet |
| 218 | * @q: the Tx queue containing Tx descriptors for the packet |
| 219 | * @cidx: index of Tx descriptor |
| 220 | * @pdev: the PCI device |
| 221 | * |
| 222 | * Unmap the main body of an sk_buff and its page fragments, if any. |
| 223 | * Because of the fairly complicated structure of our SGLs and the desire |
Divy Le Ray | 23561c9 | 2007-11-16 11:22:05 -0800 | [diff] [blame] | 224 | * to conserve space for metadata, the information necessary to unmap an |
| 225 | * sk_buff is spread across the sk_buff itself (buffer lengths), the HW Tx |
| 226 | * descriptors (the physical addresses of the various data buffers), and |
| 227 | * the SW descriptor state (assorted indices). The send functions |
| 228 | * initialize the indices for the first packet descriptor so we can unmap |
| 229 | * the buffers held in the first Tx descriptor here, and we have enough |
| 230 | * information at this point to set the state for the next Tx descriptor. |
| 231 | * |
| 232 | * Note that it is possible to clean up the first descriptor of a packet |
| 233 | * before the send routines have written the next descriptors, but this |
| 234 | * race does not cause any problem. We just end up writing the unmapping |
| 235 | * info for the descriptor first. |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 236 | */ |
| 237 | static inline void unmap_skb(struct sk_buff *skb, struct sge_txq *q, |
| 238 | unsigned int cidx, struct pci_dev *pdev) |
| 239 | { |
| 240 | const struct sg_ent *sgp; |
Divy Le Ray | 23561c9 | 2007-11-16 11:22:05 -0800 | [diff] [blame] | 241 | struct tx_sw_desc *d = &q->sdesc[cidx]; |
| 242 | int nfrags, frag_idx, curflit, j = d->addr_idx; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 243 | |
Divy Le Ray | 23561c9 | 2007-11-16 11:22:05 -0800 | [diff] [blame] | 244 | sgp = (struct sg_ent *)&q->desc[cidx].flit[d->sflit]; |
| 245 | frag_idx = d->fragidx; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 246 | |
Divy Le Ray | 23561c9 | 2007-11-16 11:22:05 -0800 | [diff] [blame] | 247 | if (frag_idx == 0 && skb_headlen(skb)) { |
| 248 | pci_unmap_single(pdev, be64_to_cpu(sgp->addr[0]), |
| 249 | skb_headlen(skb), PCI_DMA_TODEVICE); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 250 | j = 1; |
| 251 | } |
| 252 | |
Divy Le Ray | 23561c9 | 2007-11-16 11:22:05 -0800 | [diff] [blame] | 253 | curflit = d->sflit + 1 + j; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 254 | nfrags = skb_shinfo(skb)->nr_frags; |
| 255 | |
| 256 | while (frag_idx < nfrags && curflit < WR_FLITS) { |
| 257 | pci_unmap_page(pdev, be64_to_cpu(sgp->addr[j]), |
| 258 | skb_shinfo(skb)->frags[frag_idx].size, |
| 259 | PCI_DMA_TODEVICE); |
| 260 | j ^= 1; |
| 261 | if (j == 0) { |
| 262 | sgp++; |
| 263 | curflit++; |
| 264 | } |
| 265 | curflit++; |
| 266 | frag_idx++; |
| 267 | } |
| 268 | |
Divy Le Ray | 23561c9 | 2007-11-16 11:22:05 -0800 | [diff] [blame] | 269 | if (frag_idx < nfrags) { /* SGL continues into next Tx descriptor */ |
| 270 | d = cidx + 1 == q->size ? q->sdesc : d + 1; |
| 271 | d->fragidx = frag_idx; |
| 272 | d->addr_idx = j; |
| 273 | d->sflit = curflit - WR_FLITS - j; /* sflit can be -1 */ |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 274 | } |
| 275 | } |
| 276 | |
| 277 | /** |
| 278 | * free_tx_desc - reclaims Tx descriptors and their buffers |
| 279 | * @adapter: the adapter |
| 280 | * @q: the Tx queue to reclaim descriptors from |
| 281 | * @n: the number of descriptors to reclaim |
| 282 | * |
| 283 | * Reclaims Tx descriptors from an SGE Tx queue and frees the associated |
| 284 | * Tx buffers. Called with the Tx queue lock held. |
| 285 | */ |
| 286 | static void free_tx_desc(struct adapter *adapter, struct sge_txq *q, |
| 287 | unsigned int n) |
| 288 | { |
| 289 | struct tx_sw_desc *d; |
| 290 | struct pci_dev *pdev = adapter->pdev; |
| 291 | unsigned int cidx = q->cidx; |
| 292 | |
Divy Le Ray | 99d7cf3 | 2007-02-24 16:44:06 -0800 | [diff] [blame] | 293 | const int need_unmap = need_skb_unmap() && |
| 294 | q->cntxt_id >= FW_TUNNEL_SGEEC_START; |
| 295 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 296 | d = &q->sdesc[cidx]; |
| 297 | while (n--) { |
| 298 | if (d->skb) { /* an SGL is present */ |
Divy Le Ray | 99d7cf3 | 2007-02-24 16:44:06 -0800 | [diff] [blame] | 299 | if (need_unmap) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 300 | unmap_skb(d->skb, q, cidx, pdev); |
Divy Le Ray | 23561c9 | 2007-11-16 11:22:05 -0800 | [diff] [blame] | 301 | if (d->eop) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 302 | kfree_skb(d->skb); |
| 303 | } |
| 304 | ++d; |
| 305 | if (++cidx == q->size) { |
| 306 | cidx = 0; |
| 307 | d = q->sdesc; |
| 308 | } |
| 309 | } |
| 310 | q->cidx = cidx; |
| 311 | } |
| 312 | |
| 313 | /** |
| 314 | * reclaim_completed_tx - reclaims completed Tx descriptors |
| 315 | * @adapter: the adapter |
| 316 | * @q: the Tx queue to reclaim completed descriptors from |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 317 | * @chunk: maximum number of descriptors to reclaim |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 318 | * |
| 319 | * Reclaims Tx descriptors that the SGE has indicated it has processed, |
| 320 | * and frees the associated buffers if possible. Called with the Tx |
| 321 | * queue's lock held. |
| 322 | */ |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 323 | static inline unsigned int reclaim_completed_tx(struct adapter *adapter, |
| 324 | struct sge_txq *q, |
| 325 | unsigned int chunk) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 326 | { |
| 327 | unsigned int reclaim = q->processed - q->cleaned; |
| 328 | |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 329 | reclaim = min(chunk, reclaim); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 330 | if (reclaim) { |
| 331 | free_tx_desc(adapter, q, reclaim); |
| 332 | q->cleaned += reclaim; |
| 333 | q->in_use -= reclaim; |
| 334 | } |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 335 | return q->processed - q->cleaned; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 336 | } |
| 337 | |
| 338 | /** |
| 339 | * should_restart_tx - are there enough resources to restart a Tx queue? |
| 340 | * @q: the Tx queue |
| 341 | * |
| 342 | * Checks if there are enough descriptors to restart a suspended Tx queue. |
| 343 | */ |
| 344 | static inline int should_restart_tx(const struct sge_txq *q) |
| 345 | { |
| 346 | unsigned int r = q->processed - q->cleaned; |
| 347 | |
| 348 | return q->in_use - r < (q->size >> 1); |
| 349 | } |
| 350 | |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 351 | static void clear_rx_desc(struct pci_dev *pdev, const struct sge_fl *q, |
| 352 | struct rx_sw_desc *d) |
Divy Le Ray | 9bb2b31 | 2009-03-12 21:13:49 +0000 | [diff] [blame] | 353 | { |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 354 | if (q->use_pages && d->pg_chunk.page) { |
| 355 | (*d->pg_chunk.p_cnt)--; |
| 356 | if (!*d->pg_chunk.p_cnt) |
| 357 | pci_unmap_page(pdev, |
Divy Le Ray | 10b6d95 | 2009-05-28 11:23:02 +0000 | [diff] [blame] | 358 | d->pg_chunk.mapping, |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 359 | q->alloc_size, PCI_DMA_FROMDEVICE); |
| 360 | |
| 361 | put_page(d->pg_chunk.page); |
Divy Le Ray | 9bb2b31 | 2009-03-12 21:13:49 +0000 | [diff] [blame] | 362 | d->pg_chunk.page = NULL; |
| 363 | } else { |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 364 | pci_unmap_single(pdev, pci_unmap_addr(d, dma_addr), |
| 365 | q->buf_size, PCI_DMA_FROMDEVICE); |
Divy Le Ray | 9bb2b31 | 2009-03-12 21:13:49 +0000 | [diff] [blame] | 366 | kfree_skb(d->skb); |
| 367 | d->skb = NULL; |
| 368 | } |
| 369 | } |
| 370 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 371 | /** |
| 372 | * free_rx_bufs - free the Rx buffers on an SGE free list |
| 373 | * @pdev: the PCI device associated with the adapter |
| 374 | * @rxq: the SGE free list to clean up |
| 375 | * |
| 376 | * Release the buffers on an SGE free-buffer Rx queue. HW fetching from |
| 377 | * this queue should be stopped before calling this function. |
| 378 | */ |
| 379 | static void free_rx_bufs(struct pci_dev *pdev, struct sge_fl *q) |
| 380 | { |
| 381 | unsigned int cidx = q->cidx; |
| 382 | |
| 383 | while (q->credits--) { |
| 384 | struct rx_sw_desc *d = &q->sdesc[cidx]; |
| 385 | |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 386 | |
| 387 | clear_rx_desc(pdev, q, d); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 388 | if (++cidx == q->size) |
| 389 | cidx = 0; |
| 390 | } |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 391 | |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 392 | if (q->pg_chunk.page) { |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 393 | __free_pages(q->pg_chunk.page, q->order); |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 394 | q->pg_chunk.page = NULL; |
| 395 | } |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 396 | } |
| 397 | |
| 398 | /** |
| 399 | * add_one_rx_buf - add a packet buffer to a free-buffer list |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 400 | * @va: buffer start VA |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 401 | * @len: the buffer length |
| 402 | * @d: the HW Rx descriptor to write |
| 403 | * @sd: the SW Rx descriptor to write |
| 404 | * @gen: the generation bit value |
| 405 | * @pdev: the PCI device associated with the adapter |
| 406 | * |
| 407 | * Add a buffer of the given length to the supplied HW and SW Rx |
| 408 | * descriptors. |
| 409 | */ |
Divy Le Ray | b1fb1f2 | 2008-05-21 18:56:16 -0700 | [diff] [blame] | 410 | static inline int add_one_rx_buf(void *va, unsigned int len, |
| 411 | struct rx_desc *d, struct rx_sw_desc *sd, |
| 412 | unsigned int gen, struct pci_dev *pdev) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 413 | { |
| 414 | dma_addr_t mapping; |
| 415 | |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 416 | mapping = pci_map_single(pdev, va, len, PCI_DMA_FROMDEVICE); |
FUJITA Tomonori | 8d8bb39 | 2008-07-25 19:44:49 -0700 | [diff] [blame] | 417 | if (unlikely(pci_dma_mapping_error(pdev, mapping))) |
Divy Le Ray | b1fb1f2 | 2008-05-21 18:56:16 -0700 | [diff] [blame] | 418 | return -ENOMEM; |
| 419 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 420 | pci_unmap_addr_set(sd, dma_addr, mapping); |
| 421 | |
| 422 | d->addr_lo = cpu_to_be32(mapping); |
| 423 | d->addr_hi = cpu_to_be32((u64) mapping >> 32); |
| 424 | wmb(); |
| 425 | d->len_gen = cpu_to_be32(V_FLD_GEN1(gen)); |
| 426 | d->gen2 = cpu_to_be32(V_FLD_GEN2(gen)); |
Divy Le Ray | b1fb1f2 | 2008-05-21 18:56:16 -0700 | [diff] [blame] | 427 | return 0; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 428 | } |
| 429 | |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 430 | static inline int add_one_rx_chunk(dma_addr_t mapping, struct rx_desc *d, |
| 431 | unsigned int gen) |
| 432 | { |
| 433 | d->addr_lo = cpu_to_be32(mapping); |
| 434 | d->addr_hi = cpu_to_be32((u64) mapping >> 32); |
| 435 | wmb(); |
| 436 | d->len_gen = cpu_to_be32(V_FLD_GEN1(gen)); |
| 437 | d->gen2 = cpu_to_be32(V_FLD_GEN2(gen)); |
| 438 | return 0; |
| 439 | } |
| 440 | |
| 441 | static int alloc_pg_chunk(struct adapter *adapter, struct sge_fl *q, |
| 442 | struct rx_sw_desc *sd, gfp_t gfp, |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 443 | unsigned int order) |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 444 | { |
| 445 | if (!q->pg_chunk.page) { |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 446 | dma_addr_t mapping; |
| 447 | |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 448 | q->pg_chunk.page = alloc_pages(gfp, order); |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 449 | if (unlikely(!q->pg_chunk.page)) |
| 450 | return -ENOMEM; |
| 451 | q->pg_chunk.va = page_address(q->pg_chunk.page); |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 452 | q->pg_chunk.p_cnt = q->pg_chunk.va + (PAGE_SIZE << order) - |
| 453 | SGE_PG_RSVD; |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 454 | q->pg_chunk.offset = 0; |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 455 | mapping = pci_map_page(adapter->pdev, q->pg_chunk.page, |
| 456 | 0, q->alloc_size, PCI_DMA_FROMDEVICE); |
Divy Le Ray | 10b6d95 | 2009-05-28 11:23:02 +0000 | [diff] [blame] | 457 | q->pg_chunk.mapping = mapping; |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 458 | } |
| 459 | sd->pg_chunk = q->pg_chunk; |
| 460 | |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 461 | prefetch(sd->pg_chunk.p_cnt); |
| 462 | |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 463 | q->pg_chunk.offset += q->buf_size; |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 464 | if (q->pg_chunk.offset == (PAGE_SIZE << order)) |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 465 | q->pg_chunk.page = NULL; |
| 466 | else { |
| 467 | q->pg_chunk.va += q->buf_size; |
| 468 | get_page(q->pg_chunk.page); |
| 469 | } |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 470 | |
| 471 | if (sd->pg_chunk.offset == 0) |
| 472 | *sd->pg_chunk.p_cnt = 1; |
| 473 | else |
| 474 | *sd->pg_chunk.p_cnt += 1; |
| 475 | |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 476 | return 0; |
| 477 | } |
| 478 | |
Divy Le Ray | 26b3871 | 2009-03-12 21:13:43 +0000 | [diff] [blame] | 479 | static inline void ring_fl_db(struct adapter *adap, struct sge_fl *q) |
| 480 | { |
| 481 | if (q->pend_cred >= q->credits / 4) { |
| 482 | q->pend_cred = 0; |
| 483 | t3_write_reg(adap, A_SG_KDOORBELL, V_EGRCNTX(q->cntxt_id)); |
| 484 | } |
| 485 | } |
| 486 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 487 | /** |
| 488 | * refill_fl - refill an SGE free-buffer list |
| 489 | * @adapter: the adapter |
| 490 | * @q: the free-list to refill |
| 491 | * @n: the number of new buffers to allocate |
| 492 | * @gfp: the gfp flags for allocating new buffers |
| 493 | * |
| 494 | * (Re)populate an SGE free-buffer list with up to @n new packet buffers, |
| 495 | * allocated with the supplied gfp flags. The caller must assure that |
| 496 | * @n does not exceed the queue's capacity. |
| 497 | */ |
Divy Le Ray | b1fb1f2 | 2008-05-21 18:56:16 -0700 | [diff] [blame] | 498 | static int refill_fl(struct adapter *adap, struct sge_fl *q, int n, gfp_t gfp) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 499 | { |
| 500 | struct rx_sw_desc *sd = &q->sdesc[q->pidx]; |
| 501 | struct rx_desc *d = &q->desc[q->pidx]; |
Divy Le Ray | b1fb1f2 | 2008-05-21 18:56:16 -0700 | [diff] [blame] | 502 | unsigned int count = 0; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 503 | |
| 504 | while (n--) { |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 505 | dma_addr_t mapping; |
Divy Le Ray | b1fb1f2 | 2008-05-21 18:56:16 -0700 | [diff] [blame] | 506 | int err; |
| 507 | |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 508 | if (q->use_pages) { |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 509 | if (unlikely(alloc_pg_chunk(adap, q, sd, gfp, |
| 510 | q->order))) { |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 511 | nomem: q->alloc_failed++; |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 512 | break; |
| 513 | } |
Divy Le Ray | 10b6d95 | 2009-05-28 11:23:02 +0000 | [diff] [blame] | 514 | mapping = sd->pg_chunk.mapping + sd->pg_chunk.offset; |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 515 | pci_unmap_addr_set(sd, dma_addr, mapping); |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 516 | |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 517 | add_one_rx_chunk(mapping, d, q->gen); |
| 518 | pci_dma_sync_single_for_device(adap->pdev, mapping, |
| 519 | q->buf_size - SGE_PG_RSVD, |
| 520 | PCI_DMA_FROMDEVICE); |
| 521 | } else { |
| 522 | void *buf_start; |
| 523 | |
| 524 | struct sk_buff *skb = alloc_skb(q->buf_size, gfp); |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 525 | if (!skb) |
| 526 | goto nomem; |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 527 | |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 528 | sd->skb = skb; |
| 529 | buf_start = skb->data; |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 530 | err = add_one_rx_buf(buf_start, q->buf_size, d, sd, |
| 531 | q->gen, adap->pdev); |
| 532 | if (unlikely(err)) { |
| 533 | clear_rx_desc(adap->pdev, q, sd); |
| 534 | break; |
| 535 | } |
Divy Le Ray | b1fb1f2 | 2008-05-21 18:56:16 -0700 | [diff] [blame] | 536 | } |
| 537 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 538 | d++; |
| 539 | sd++; |
| 540 | if (++q->pidx == q->size) { |
| 541 | q->pidx = 0; |
| 542 | q->gen ^= 1; |
| 543 | sd = q->sdesc; |
| 544 | d = q->desc; |
| 545 | } |
Divy Le Ray | b1fb1f2 | 2008-05-21 18:56:16 -0700 | [diff] [blame] | 546 | count++; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 547 | } |
Divy Le Ray | 26b3871 | 2009-03-12 21:13:43 +0000 | [diff] [blame] | 548 | |
| 549 | q->credits += count; |
| 550 | q->pend_cred += count; |
| 551 | ring_fl_db(adap, q); |
Divy Le Ray | b1fb1f2 | 2008-05-21 18:56:16 -0700 | [diff] [blame] | 552 | |
| 553 | return count; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 554 | } |
| 555 | |
| 556 | static inline void __refill_fl(struct adapter *adap, struct sge_fl *fl) |
| 557 | { |
Divy Le Ray | 26b3871 | 2009-03-12 21:13:43 +0000 | [diff] [blame] | 558 | refill_fl(adap, fl, min(MAX_RX_REFILL, fl->size - fl->credits), |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 559 | GFP_ATOMIC | __GFP_COMP); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | /** |
| 563 | * recycle_rx_buf - recycle a receive buffer |
| 564 | * @adapter: the adapter |
| 565 | * @q: the SGE free list |
| 566 | * @idx: index of buffer to recycle |
| 567 | * |
| 568 | * Recycles the specified buffer on the given free list by adding it at |
| 569 | * the next available slot on the list. |
| 570 | */ |
| 571 | static void recycle_rx_buf(struct adapter *adap, struct sge_fl *q, |
| 572 | unsigned int idx) |
| 573 | { |
| 574 | struct rx_desc *from = &q->desc[idx]; |
| 575 | struct rx_desc *to = &q->desc[q->pidx]; |
| 576 | |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 577 | q->sdesc[q->pidx] = q->sdesc[idx]; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 578 | to->addr_lo = from->addr_lo; /* already big endian */ |
| 579 | to->addr_hi = from->addr_hi; /* likewise */ |
| 580 | wmb(); |
| 581 | to->len_gen = cpu_to_be32(V_FLD_GEN1(q->gen)); |
| 582 | to->gen2 = cpu_to_be32(V_FLD_GEN2(q->gen)); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 583 | |
| 584 | if (++q->pidx == q->size) { |
| 585 | q->pidx = 0; |
| 586 | q->gen ^= 1; |
| 587 | } |
Divy Le Ray | 26b3871 | 2009-03-12 21:13:43 +0000 | [diff] [blame] | 588 | |
| 589 | q->credits++; |
| 590 | q->pend_cred++; |
| 591 | ring_fl_db(adap, q); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 592 | } |
| 593 | |
| 594 | /** |
| 595 | * alloc_ring - allocate resources for an SGE descriptor ring |
| 596 | * @pdev: the PCI device |
| 597 | * @nelem: the number of descriptors |
| 598 | * @elem_size: the size of each descriptor |
| 599 | * @sw_size: the size of the SW state associated with each ring element |
| 600 | * @phys: the physical address of the allocated ring |
| 601 | * @metadata: address of the array holding the SW state for the ring |
| 602 | * |
| 603 | * Allocates resources for an SGE descriptor ring, such as Tx queues, |
| 604 | * free buffer lists, or response queues. Each SGE ring requires |
| 605 | * space for its HW descriptors plus, optionally, space for the SW state |
| 606 | * associated with each HW entry (the metadata). The function returns |
| 607 | * three values: the virtual address for the HW ring (the return value |
| 608 | * of the function), the physical address of the HW ring, and the address |
| 609 | * of the SW ring. |
| 610 | */ |
| 611 | static void *alloc_ring(struct pci_dev *pdev, size_t nelem, size_t elem_size, |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 612 | size_t sw_size, dma_addr_t * phys, void *metadata) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 613 | { |
| 614 | size_t len = nelem * elem_size; |
| 615 | void *s = NULL; |
| 616 | void *p = dma_alloc_coherent(&pdev->dev, len, phys, GFP_KERNEL); |
| 617 | |
| 618 | if (!p) |
| 619 | return NULL; |
Divy Le Ray | 5256554 | 2008-11-26 15:35:59 -0800 | [diff] [blame] | 620 | if (sw_size && metadata) { |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 621 | s = kcalloc(nelem, sw_size, GFP_KERNEL); |
| 622 | |
| 623 | if (!s) { |
| 624 | dma_free_coherent(&pdev->dev, len, p, *phys); |
| 625 | return NULL; |
| 626 | } |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 627 | *(void **)metadata = s; |
Divy Le Ray | 5256554 | 2008-11-26 15:35:59 -0800 | [diff] [blame] | 628 | } |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 629 | memset(p, 0, len); |
| 630 | return p; |
| 631 | } |
| 632 | |
| 633 | /** |
Divy Le Ray | 204e2f9 | 2008-05-06 19:26:01 -0700 | [diff] [blame] | 634 | * t3_reset_qset - reset a sge qset |
| 635 | * @q: the queue set |
| 636 | * |
| 637 | * Reset the qset structure. |
| 638 | * the NAPI structure is preserved in the event of |
| 639 | * the qset's reincarnation, for example during EEH recovery. |
| 640 | */ |
| 641 | static void t3_reset_qset(struct sge_qset *q) |
| 642 | { |
| 643 | if (q->adap && |
| 644 | !(q->adap->flags & NAPI_INIT)) { |
| 645 | memset(q, 0, sizeof(*q)); |
| 646 | return; |
| 647 | } |
| 648 | |
| 649 | q->adap = NULL; |
| 650 | memset(&q->rspq, 0, sizeof(q->rspq)); |
| 651 | memset(q->fl, 0, sizeof(struct sge_fl) * SGE_RXQ_PER_SET); |
| 652 | memset(q->txq, 0, sizeof(struct sge_txq) * SGE_TXQ_PER_SET); |
| 653 | q->txq_stopped = 0; |
Divy Le Ray | 20d3fc1 | 2008-10-08 17:36:03 -0700 | [diff] [blame] | 654 | q->tx_reclaim_timer.function = NULL; /* for t3_stop_sge_timers() */ |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 655 | q->rx_reclaim_timer.function = NULL; |
Herbert Xu | 7be2df4 | 2009-01-21 14:39:13 -0800 | [diff] [blame] | 656 | q->lro_frag_tbl.nr_frags = q->lro_frag_tbl.len = 0; |
Divy Le Ray | 204e2f9 | 2008-05-06 19:26:01 -0700 | [diff] [blame] | 657 | } |
| 658 | |
| 659 | |
| 660 | /** |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 661 | * free_qset - free the resources of an SGE queue set |
| 662 | * @adapter: the adapter owning the queue set |
| 663 | * @q: the queue set |
| 664 | * |
| 665 | * Release the HW and SW resources associated with an SGE queue set, such |
| 666 | * as HW contexts, packet buffers, and descriptor rings. Traffic to the |
| 667 | * queue set must be quiesced prior to calling this. |
| 668 | */ |
Stephen Hemminger | 9265fab | 2007-10-08 16:22:29 -0700 | [diff] [blame] | 669 | static void t3_free_qset(struct adapter *adapter, struct sge_qset *q) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 670 | { |
| 671 | int i; |
| 672 | struct pci_dev *pdev = adapter->pdev; |
| 673 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 674 | for (i = 0; i < SGE_RXQ_PER_SET; ++i) |
| 675 | if (q->fl[i].desc) { |
Roland Dreier | b1186de | 2008-03-20 13:30:48 -0700 | [diff] [blame] | 676 | spin_lock_irq(&adapter->sge.reg_lock); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 677 | t3_sge_disable_fl(adapter, q->fl[i].cntxt_id); |
Roland Dreier | b1186de | 2008-03-20 13:30:48 -0700 | [diff] [blame] | 678 | spin_unlock_irq(&adapter->sge.reg_lock); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 679 | free_rx_bufs(pdev, &q->fl[i]); |
| 680 | kfree(q->fl[i].sdesc); |
| 681 | dma_free_coherent(&pdev->dev, |
| 682 | q->fl[i].size * |
| 683 | sizeof(struct rx_desc), q->fl[i].desc, |
| 684 | q->fl[i].phys_addr); |
| 685 | } |
| 686 | |
| 687 | for (i = 0; i < SGE_TXQ_PER_SET; ++i) |
| 688 | if (q->txq[i].desc) { |
Roland Dreier | b1186de | 2008-03-20 13:30:48 -0700 | [diff] [blame] | 689 | spin_lock_irq(&adapter->sge.reg_lock); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 690 | t3_sge_enable_ecntxt(adapter, q->txq[i].cntxt_id, 0); |
Roland Dreier | b1186de | 2008-03-20 13:30:48 -0700 | [diff] [blame] | 691 | spin_unlock_irq(&adapter->sge.reg_lock); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 692 | if (q->txq[i].sdesc) { |
| 693 | free_tx_desc(adapter, &q->txq[i], |
| 694 | q->txq[i].in_use); |
| 695 | kfree(q->txq[i].sdesc); |
| 696 | } |
| 697 | dma_free_coherent(&pdev->dev, |
| 698 | q->txq[i].size * |
| 699 | sizeof(struct tx_desc), |
| 700 | q->txq[i].desc, q->txq[i].phys_addr); |
| 701 | __skb_queue_purge(&q->txq[i].sendq); |
| 702 | } |
| 703 | |
| 704 | if (q->rspq.desc) { |
Roland Dreier | b1186de | 2008-03-20 13:30:48 -0700 | [diff] [blame] | 705 | spin_lock_irq(&adapter->sge.reg_lock); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 706 | t3_sge_disable_rspcntxt(adapter, q->rspq.cntxt_id); |
Roland Dreier | b1186de | 2008-03-20 13:30:48 -0700 | [diff] [blame] | 707 | spin_unlock_irq(&adapter->sge.reg_lock); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 708 | dma_free_coherent(&pdev->dev, |
| 709 | q->rspq.size * sizeof(struct rsp_desc), |
| 710 | q->rspq.desc, q->rspq.phys_addr); |
| 711 | } |
| 712 | |
Divy Le Ray | 204e2f9 | 2008-05-06 19:26:01 -0700 | [diff] [blame] | 713 | t3_reset_qset(q); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 714 | } |
| 715 | |
| 716 | /** |
| 717 | * init_qset_cntxt - initialize an SGE queue set context info |
| 718 | * @qs: the queue set |
| 719 | * @id: the queue set id |
| 720 | * |
| 721 | * Initializes the TIDs and context ids for the queues of a queue set. |
| 722 | */ |
| 723 | static void init_qset_cntxt(struct sge_qset *qs, unsigned int id) |
| 724 | { |
| 725 | qs->rspq.cntxt_id = id; |
| 726 | qs->fl[0].cntxt_id = 2 * id; |
| 727 | qs->fl[1].cntxt_id = 2 * id + 1; |
| 728 | qs->txq[TXQ_ETH].cntxt_id = FW_TUNNEL_SGEEC_START + id; |
| 729 | qs->txq[TXQ_ETH].token = FW_TUNNEL_TID_START + id; |
| 730 | qs->txq[TXQ_OFLD].cntxt_id = FW_OFLD_SGEEC_START + id; |
| 731 | qs->txq[TXQ_CTRL].cntxt_id = FW_CTRL_SGEEC_START + id; |
| 732 | qs->txq[TXQ_CTRL].token = FW_CTRL_TID_START + id; |
| 733 | } |
| 734 | |
| 735 | /** |
| 736 | * sgl_len - calculates the size of an SGL of the given capacity |
| 737 | * @n: the number of SGL entries |
| 738 | * |
| 739 | * Calculates the number of flits needed for a scatter/gather list that |
| 740 | * can hold the given number of entries. |
| 741 | */ |
| 742 | static inline unsigned int sgl_len(unsigned int n) |
| 743 | { |
| 744 | /* alternatively: 3 * (n / 2) + 2 * (n & 1) */ |
| 745 | return (3 * n) / 2 + (n & 1); |
| 746 | } |
| 747 | |
| 748 | /** |
| 749 | * flits_to_desc - returns the num of Tx descriptors for the given flits |
| 750 | * @n: the number of flits |
| 751 | * |
| 752 | * Calculates the number of Tx descriptors needed for the supplied number |
| 753 | * of flits. |
| 754 | */ |
| 755 | static inline unsigned int flits_to_desc(unsigned int n) |
| 756 | { |
| 757 | BUG_ON(n >= ARRAY_SIZE(flit_desc_map)); |
| 758 | return flit_desc_map[n]; |
| 759 | } |
| 760 | |
| 761 | /** |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 762 | * get_packet - return the next ingress packet buffer from a free list |
| 763 | * @adap: the adapter that received the packet |
| 764 | * @fl: the SGE free list holding the packet |
| 765 | * @len: the packet length including any SGE padding |
| 766 | * @drop_thres: # of remaining buffers before we start dropping packets |
| 767 | * |
| 768 | * Get the next packet from a free list and complete setup of the |
| 769 | * sk_buff. If the packet is small we make a copy and recycle the |
| 770 | * original buffer, otherwise we use the original buffer itself. If a |
| 771 | * positive drop threshold is supplied packets are dropped and their |
| 772 | * buffers recycled if (a) the number of remaining buffers is under the |
| 773 | * threshold and the packet is too big to copy, or (b) the packet should |
| 774 | * be copied but there is no memory for the copy. |
| 775 | */ |
| 776 | static struct sk_buff *get_packet(struct adapter *adap, struct sge_fl *fl, |
| 777 | unsigned int len, unsigned int drop_thres) |
| 778 | { |
| 779 | struct sk_buff *skb = NULL; |
| 780 | struct rx_sw_desc *sd = &fl->sdesc[fl->cidx]; |
| 781 | |
| 782 | prefetch(sd->skb->data); |
| 783 | fl->credits--; |
| 784 | |
| 785 | if (len <= SGE_RX_COPY_THRES) { |
| 786 | skb = alloc_skb(len, GFP_ATOMIC); |
| 787 | if (likely(skb != NULL)) { |
| 788 | __skb_put(skb, len); |
| 789 | pci_dma_sync_single_for_cpu(adap->pdev, |
| 790 | pci_unmap_addr(sd, dma_addr), len, |
| 791 | PCI_DMA_FROMDEVICE); |
| 792 | memcpy(skb->data, sd->skb->data, len); |
| 793 | pci_dma_sync_single_for_device(adap->pdev, |
| 794 | pci_unmap_addr(sd, dma_addr), len, |
| 795 | PCI_DMA_FROMDEVICE); |
| 796 | } else if (!drop_thres) |
| 797 | goto use_orig_buf; |
| 798 | recycle: |
| 799 | recycle_rx_buf(adap, fl, fl->cidx); |
| 800 | return skb; |
| 801 | } |
| 802 | |
Divy Le Ray | 26b3871 | 2009-03-12 21:13:43 +0000 | [diff] [blame] | 803 | if (unlikely(fl->credits < drop_thres) && |
| 804 | refill_fl(adap, fl, min(MAX_RX_REFILL, fl->size - fl->credits - 1), |
| 805 | GFP_ATOMIC | __GFP_COMP) == 0) |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 806 | goto recycle; |
| 807 | |
| 808 | use_orig_buf: |
| 809 | pci_unmap_single(adap->pdev, pci_unmap_addr(sd, dma_addr), |
| 810 | fl->buf_size, PCI_DMA_FROMDEVICE); |
| 811 | skb = sd->skb; |
| 812 | skb_put(skb, len); |
| 813 | __refill_fl(adap, fl); |
| 814 | return skb; |
| 815 | } |
| 816 | |
| 817 | /** |
| 818 | * get_packet_pg - return the next ingress packet buffer from a free list |
| 819 | * @adap: the adapter that received the packet |
| 820 | * @fl: the SGE free list holding the packet |
| 821 | * @len: the packet length including any SGE padding |
| 822 | * @drop_thres: # of remaining buffers before we start dropping packets |
| 823 | * |
| 824 | * Get the next packet from a free list populated with page chunks. |
| 825 | * If the packet is small we make a copy and recycle the original buffer, |
| 826 | * otherwise we attach the original buffer as a page fragment to a fresh |
| 827 | * sk_buff. If a positive drop threshold is supplied packets are dropped |
| 828 | * and their buffers recycled if (a) the number of remaining buffers is |
| 829 | * under the threshold and the packet is too big to copy, or (b) there's |
| 830 | * no system memory. |
| 831 | * |
| 832 | * Note: this function is similar to @get_packet but deals with Rx buffers |
| 833 | * that are page chunks rather than sk_buffs. |
| 834 | */ |
| 835 | static struct sk_buff *get_packet_pg(struct adapter *adap, struct sge_fl *fl, |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 836 | struct sge_rspq *q, unsigned int len, |
| 837 | unsigned int drop_thres) |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 838 | { |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 839 | struct sk_buff *newskb, *skb; |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 840 | struct rx_sw_desc *sd = &fl->sdesc[fl->cidx]; |
| 841 | |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 842 | dma_addr_t dma_addr = pci_unmap_addr(sd, dma_addr); |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 843 | |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 844 | newskb = skb = q->pg_skb; |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 845 | if (!skb && (len <= SGE_RX_COPY_THRES)) { |
| 846 | newskb = alloc_skb(len, GFP_ATOMIC); |
| 847 | if (likely(newskb != NULL)) { |
| 848 | __skb_put(newskb, len); |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 849 | pci_dma_sync_single_for_cpu(adap->pdev, dma_addr, len, |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 850 | PCI_DMA_FROMDEVICE); |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 851 | memcpy(newskb->data, sd->pg_chunk.va, len); |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 852 | pci_dma_sync_single_for_device(adap->pdev, dma_addr, |
| 853 | len, |
| 854 | PCI_DMA_FROMDEVICE); |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 855 | } else if (!drop_thres) |
| 856 | return NULL; |
| 857 | recycle: |
| 858 | fl->credits--; |
| 859 | recycle_rx_buf(adap, fl, fl->cidx); |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 860 | q->rx_recycle_buf++; |
| 861 | return newskb; |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 862 | } |
| 863 | |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 864 | if (unlikely(q->rx_recycle_buf || (!skb && fl->credits <= drop_thres))) |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 865 | goto recycle; |
| 866 | |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 867 | prefetch(sd->pg_chunk.p_cnt); |
| 868 | |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 869 | if (!skb) |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 870 | newskb = alloc_skb(SGE_RX_PULL_LEN, GFP_ATOMIC); |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 871 | |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 872 | if (unlikely(!newskb)) { |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 873 | if (!drop_thres) |
| 874 | return NULL; |
| 875 | goto recycle; |
| 876 | } |
| 877 | |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 878 | pci_dma_sync_single_for_cpu(adap->pdev, dma_addr, len, |
| 879 | PCI_DMA_FROMDEVICE); |
| 880 | (*sd->pg_chunk.p_cnt)--; |
| 881 | if (!*sd->pg_chunk.p_cnt) |
| 882 | pci_unmap_page(adap->pdev, |
Divy Le Ray | 10b6d95 | 2009-05-28 11:23:02 +0000 | [diff] [blame] | 883 | sd->pg_chunk.mapping, |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 884 | fl->alloc_size, |
| 885 | PCI_DMA_FROMDEVICE); |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 886 | if (!skb) { |
| 887 | __skb_put(newskb, SGE_RX_PULL_LEN); |
| 888 | memcpy(newskb->data, sd->pg_chunk.va, SGE_RX_PULL_LEN); |
| 889 | skb_fill_page_desc(newskb, 0, sd->pg_chunk.page, |
| 890 | sd->pg_chunk.offset + SGE_RX_PULL_LEN, |
| 891 | len - SGE_RX_PULL_LEN); |
| 892 | newskb->len = len; |
| 893 | newskb->data_len = len - SGE_RX_PULL_LEN; |
Divy Le Ray | 8f43580 | 2009-03-12 21:13:54 +0000 | [diff] [blame] | 894 | newskb->truesize += newskb->data_len; |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 895 | } else { |
| 896 | skb_fill_page_desc(newskb, skb_shinfo(newskb)->nr_frags, |
| 897 | sd->pg_chunk.page, |
| 898 | sd->pg_chunk.offset, len); |
| 899 | newskb->len += len; |
| 900 | newskb->data_len += len; |
Divy Le Ray | 8f43580 | 2009-03-12 21:13:54 +0000 | [diff] [blame] | 901 | newskb->truesize += len; |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 902 | } |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 903 | |
| 904 | fl->credits--; |
| 905 | /* |
| 906 | * We do not refill FLs here, we let the caller do it to overlap a |
| 907 | * prefetch. |
| 908 | */ |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 909 | return newskb; |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 910 | } |
| 911 | |
| 912 | /** |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 913 | * get_imm_packet - return the next ingress packet buffer from a response |
| 914 | * @resp: the response descriptor containing the packet data |
| 915 | * |
| 916 | * Return a packet containing the immediate data of the given response. |
| 917 | */ |
| 918 | static inline struct sk_buff *get_imm_packet(const struct rsp_desc *resp) |
| 919 | { |
| 920 | struct sk_buff *skb = alloc_skb(IMMED_PKT_SIZE, GFP_ATOMIC); |
| 921 | |
| 922 | if (skb) { |
| 923 | __skb_put(skb, IMMED_PKT_SIZE); |
Arnaldo Carvalho de Melo | 27d7ff4 | 2007-03-31 11:55:19 -0300 | [diff] [blame] | 924 | skb_copy_to_linear_data(skb, resp->imm_data, IMMED_PKT_SIZE); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 925 | } |
| 926 | return skb; |
| 927 | } |
| 928 | |
| 929 | /** |
| 930 | * calc_tx_descs - calculate the number of Tx descriptors for a packet |
| 931 | * @skb: the packet |
| 932 | * |
| 933 | * Returns the number of Tx descriptors needed for the given Ethernet |
| 934 | * packet. Ethernet packets require addition of WR and CPL headers. |
| 935 | */ |
| 936 | static inline unsigned int calc_tx_descs(const struct sk_buff *skb) |
| 937 | { |
| 938 | unsigned int flits; |
| 939 | |
| 940 | if (skb->len <= WR_LEN - sizeof(struct cpl_tx_pkt)) |
| 941 | return 1; |
| 942 | |
| 943 | flits = sgl_len(skb_shinfo(skb)->nr_frags + 1) + 2; |
| 944 | if (skb_shinfo(skb)->gso_size) |
| 945 | flits++; |
| 946 | return flits_to_desc(flits); |
| 947 | } |
| 948 | |
| 949 | /** |
| 950 | * make_sgl - populate a scatter/gather list for a packet |
| 951 | * @skb: the packet |
| 952 | * @sgp: the SGL to populate |
| 953 | * @start: start address of skb main body data to include in the SGL |
| 954 | * @len: length of skb main body data to include in the SGL |
| 955 | * @pdev: the PCI device |
| 956 | * |
| 957 | * Generates a scatter/gather list for the buffers that make up a packet |
| 958 | * and returns the SGL size in 8-byte words. The caller must size the SGL |
| 959 | * appropriately. |
| 960 | */ |
| 961 | static inline unsigned int make_sgl(const struct sk_buff *skb, |
| 962 | struct sg_ent *sgp, unsigned char *start, |
| 963 | unsigned int len, struct pci_dev *pdev) |
| 964 | { |
| 965 | dma_addr_t mapping; |
| 966 | unsigned int i, j = 0, nfrags; |
| 967 | |
| 968 | if (len) { |
| 969 | mapping = pci_map_single(pdev, start, len, PCI_DMA_TODEVICE); |
| 970 | sgp->len[0] = cpu_to_be32(len); |
| 971 | sgp->addr[0] = cpu_to_be64(mapping); |
| 972 | j = 1; |
| 973 | } |
| 974 | |
| 975 | nfrags = skb_shinfo(skb)->nr_frags; |
| 976 | for (i = 0; i < nfrags; i++) { |
| 977 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
| 978 | |
| 979 | mapping = pci_map_page(pdev, frag->page, frag->page_offset, |
| 980 | frag->size, PCI_DMA_TODEVICE); |
| 981 | sgp->len[j] = cpu_to_be32(frag->size); |
| 982 | sgp->addr[j] = cpu_to_be64(mapping); |
| 983 | j ^= 1; |
| 984 | if (j == 0) |
| 985 | ++sgp; |
| 986 | } |
| 987 | if (j) |
| 988 | sgp->len[j] = 0; |
| 989 | return ((nfrags + (len != 0)) * 3) / 2 + j; |
| 990 | } |
| 991 | |
| 992 | /** |
| 993 | * check_ring_tx_db - check and potentially ring a Tx queue's doorbell |
| 994 | * @adap: the adapter |
| 995 | * @q: the Tx queue |
| 996 | * |
| 997 | * Ring the doorbel if a Tx queue is asleep. There is a natural race, |
| 998 | * where the HW is going to sleep just after we checked, however, |
| 999 | * then the interrupt handler will detect the outstanding TX packet |
| 1000 | * and ring the doorbell for us. |
| 1001 | * |
| 1002 | * When GTS is disabled we unconditionally ring the doorbell. |
| 1003 | */ |
| 1004 | static inline void check_ring_tx_db(struct adapter *adap, struct sge_txq *q) |
| 1005 | { |
| 1006 | #if USE_GTS |
| 1007 | clear_bit(TXQ_LAST_PKT_DB, &q->flags); |
| 1008 | if (test_and_set_bit(TXQ_RUNNING, &q->flags) == 0) { |
| 1009 | set_bit(TXQ_LAST_PKT_DB, &q->flags); |
| 1010 | t3_write_reg(adap, A_SG_KDOORBELL, |
| 1011 | F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); |
| 1012 | } |
| 1013 | #else |
| 1014 | wmb(); /* write descriptors before telling HW */ |
| 1015 | t3_write_reg(adap, A_SG_KDOORBELL, |
| 1016 | F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); |
| 1017 | #endif |
| 1018 | } |
| 1019 | |
| 1020 | static inline void wr_gen2(struct tx_desc *d, unsigned int gen) |
| 1021 | { |
| 1022 | #if SGE_NUM_GENBITS == 2 |
| 1023 | d->flit[TX_DESC_FLITS - 1] = cpu_to_be64(gen); |
| 1024 | #endif |
| 1025 | } |
| 1026 | |
| 1027 | /** |
| 1028 | * write_wr_hdr_sgl - write a WR header and, optionally, SGL |
| 1029 | * @ndesc: number of Tx descriptors spanned by the SGL |
| 1030 | * @skb: the packet corresponding to the WR |
| 1031 | * @d: first Tx descriptor to be written |
| 1032 | * @pidx: index of above descriptors |
| 1033 | * @q: the SGE Tx queue |
| 1034 | * @sgl: the SGL |
| 1035 | * @flits: number of flits to the start of the SGL in the first descriptor |
| 1036 | * @sgl_flits: the SGL size in flits |
| 1037 | * @gen: the Tx descriptor generation |
| 1038 | * @wr_hi: top 32 bits of WR header based on WR type (big endian) |
| 1039 | * @wr_lo: low 32 bits of WR header based on WR type (big endian) |
| 1040 | * |
| 1041 | * Write a work request header and an associated SGL. If the SGL is |
| 1042 | * small enough to fit into one Tx descriptor it has already been written |
| 1043 | * and we just need to write the WR header. Otherwise we distribute the |
| 1044 | * SGL across the number of descriptors it spans. |
| 1045 | */ |
| 1046 | static void write_wr_hdr_sgl(unsigned int ndesc, struct sk_buff *skb, |
| 1047 | struct tx_desc *d, unsigned int pidx, |
| 1048 | const struct sge_txq *q, |
| 1049 | const struct sg_ent *sgl, |
| 1050 | unsigned int flits, unsigned int sgl_flits, |
Al Viro | fb8e444 | 2007-08-23 03:04:12 -0400 | [diff] [blame] | 1051 | unsigned int gen, __be32 wr_hi, |
| 1052 | __be32 wr_lo) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1053 | { |
| 1054 | struct work_request_hdr *wrp = (struct work_request_hdr *)d; |
| 1055 | struct tx_sw_desc *sd = &q->sdesc[pidx]; |
| 1056 | |
| 1057 | sd->skb = skb; |
| 1058 | if (need_skb_unmap()) { |
Divy Le Ray | 23561c9 | 2007-11-16 11:22:05 -0800 | [diff] [blame] | 1059 | sd->fragidx = 0; |
| 1060 | sd->addr_idx = 0; |
| 1061 | sd->sflit = flits; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1062 | } |
| 1063 | |
| 1064 | if (likely(ndesc == 1)) { |
Divy Le Ray | 23561c9 | 2007-11-16 11:22:05 -0800 | [diff] [blame] | 1065 | sd->eop = 1; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1066 | wrp->wr_hi = htonl(F_WR_SOP | F_WR_EOP | V_WR_DATATYPE(1) | |
| 1067 | V_WR_SGLSFLT(flits)) | wr_hi; |
| 1068 | wmb(); |
| 1069 | wrp->wr_lo = htonl(V_WR_LEN(flits + sgl_flits) | |
| 1070 | V_WR_GEN(gen)) | wr_lo; |
| 1071 | wr_gen2(d, gen); |
| 1072 | } else { |
| 1073 | unsigned int ogen = gen; |
| 1074 | const u64 *fp = (const u64 *)sgl; |
| 1075 | struct work_request_hdr *wp = wrp; |
| 1076 | |
| 1077 | wrp->wr_hi = htonl(F_WR_SOP | V_WR_DATATYPE(1) | |
| 1078 | V_WR_SGLSFLT(flits)) | wr_hi; |
| 1079 | |
| 1080 | while (sgl_flits) { |
| 1081 | unsigned int avail = WR_FLITS - flits; |
| 1082 | |
| 1083 | if (avail > sgl_flits) |
| 1084 | avail = sgl_flits; |
| 1085 | memcpy(&d->flit[flits], fp, avail * sizeof(*fp)); |
| 1086 | sgl_flits -= avail; |
| 1087 | ndesc--; |
| 1088 | if (!sgl_flits) |
| 1089 | break; |
| 1090 | |
| 1091 | fp += avail; |
| 1092 | d++; |
Divy Le Ray | 23561c9 | 2007-11-16 11:22:05 -0800 | [diff] [blame] | 1093 | sd->eop = 0; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1094 | sd++; |
| 1095 | if (++pidx == q->size) { |
| 1096 | pidx = 0; |
| 1097 | gen ^= 1; |
| 1098 | d = q->desc; |
| 1099 | sd = q->sdesc; |
| 1100 | } |
| 1101 | |
| 1102 | sd->skb = skb; |
| 1103 | wrp = (struct work_request_hdr *)d; |
| 1104 | wrp->wr_hi = htonl(V_WR_DATATYPE(1) | |
| 1105 | V_WR_SGLSFLT(1)) | wr_hi; |
| 1106 | wrp->wr_lo = htonl(V_WR_LEN(min(WR_FLITS, |
| 1107 | sgl_flits + 1)) | |
| 1108 | V_WR_GEN(gen)) | wr_lo; |
| 1109 | wr_gen2(d, gen); |
| 1110 | flits = 1; |
| 1111 | } |
Divy Le Ray | 23561c9 | 2007-11-16 11:22:05 -0800 | [diff] [blame] | 1112 | sd->eop = 1; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1113 | wrp->wr_hi |= htonl(F_WR_EOP); |
| 1114 | wmb(); |
| 1115 | wp->wr_lo = htonl(V_WR_LEN(WR_FLITS) | V_WR_GEN(ogen)) | wr_lo; |
| 1116 | wr_gen2((struct tx_desc *)wp, ogen); |
| 1117 | WARN_ON(ndesc != 0); |
| 1118 | } |
| 1119 | } |
| 1120 | |
| 1121 | /** |
| 1122 | * write_tx_pkt_wr - write a TX_PKT work request |
| 1123 | * @adap: the adapter |
| 1124 | * @skb: the packet to send |
| 1125 | * @pi: the egress interface |
| 1126 | * @pidx: index of the first Tx descriptor to write |
| 1127 | * @gen: the generation value to use |
| 1128 | * @q: the Tx queue |
| 1129 | * @ndesc: number of descriptors the packet will occupy |
| 1130 | * @compl: the value of the COMPL bit to use |
| 1131 | * |
| 1132 | * Generate a TX_PKT work request to send the supplied packet. |
| 1133 | */ |
| 1134 | static void write_tx_pkt_wr(struct adapter *adap, struct sk_buff *skb, |
| 1135 | const struct port_info *pi, |
| 1136 | unsigned int pidx, unsigned int gen, |
| 1137 | struct sge_txq *q, unsigned int ndesc, |
| 1138 | unsigned int compl) |
| 1139 | { |
| 1140 | unsigned int flits, sgl_flits, cntrl, tso_info; |
| 1141 | struct sg_ent *sgp, sgl[MAX_SKB_FRAGS / 2 + 1]; |
| 1142 | struct tx_desc *d = &q->desc[pidx]; |
| 1143 | struct cpl_tx_pkt *cpl = (struct cpl_tx_pkt *)d; |
| 1144 | |
Divy Le Ray | 3fa58c88 | 2009-03-26 16:39:14 +0000 | [diff] [blame] | 1145 | cpl->len = htonl(skb->len); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1146 | cntrl = V_TXPKT_INTF(pi->port_id); |
| 1147 | |
| 1148 | if (vlan_tx_tag_present(skb) && pi->vlan_grp) |
| 1149 | cntrl |= F_TXPKT_VLAN_VLD | V_TXPKT_VLAN(vlan_tx_tag_get(skb)); |
| 1150 | |
| 1151 | tso_info = V_LSO_MSS(skb_shinfo(skb)->gso_size); |
| 1152 | if (tso_info) { |
| 1153 | int eth_type; |
| 1154 | struct cpl_tx_pkt_lso *hdr = (struct cpl_tx_pkt_lso *)cpl; |
| 1155 | |
| 1156 | d->flit[2] = 0; |
| 1157 | cntrl |= V_TXPKT_OPCODE(CPL_TX_PKT_LSO); |
| 1158 | hdr->cntrl = htonl(cntrl); |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1159 | eth_type = skb_network_offset(skb) == ETH_HLEN ? |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1160 | CPL_ETH_II : CPL_ETH_II_VLAN; |
| 1161 | tso_info |= V_LSO_ETH_TYPE(eth_type) | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1162 | V_LSO_IPHDR_WORDS(ip_hdr(skb)->ihl) | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1163 | V_LSO_TCPHDR_WORDS(tcp_hdr(skb)->doff); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1164 | hdr->lso_info = htonl(tso_info); |
| 1165 | flits = 3; |
| 1166 | } else { |
| 1167 | cntrl |= V_TXPKT_OPCODE(CPL_TX_PKT); |
| 1168 | cntrl |= F_TXPKT_IPCSUM_DIS; /* SW calculates IP csum */ |
| 1169 | cntrl |= V_TXPKT_L4CSUM_DIS(skb->ip_summed != CHECKSUM_PARTIAL); |
| 1170 | cpl->cntrl = htonl(cntrl); |
| 1171 | |
| 1172 | if (skb->len <= WR_LEN - sizeof(*cpl)) { |
| 1173 | q->sdesc[pidx].skb = NULL; |
| 1174 | if (!skb->data_len) |
Arnaldo Carvalho de Melo | d626f62 | 2007-03-27 18:55:52 -0300 | [diff] [blame] | 1175 | skb_copy_from_linear_data(skb, &d->flit[2], |
| 1176 | skb->len); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1177 | else |
| 1178 | skb_copy_bits(skb, 0, &d->flit[2], skb->len); |
| 1179 | |
| 1180 | flits = (skb->len + 7) / 8 + 2; |
| 1181 | cpl->wr.wr_hi = htonl(V_WR_BCNTLFLT(skb->len & 7) | |
| 1182 | V_WR_OP(FW_WROPCODE_TUNNEL_TX_PKT) |
| 1183 | | F_WR_SOP | F_WR_EOP | compl); |
| 1184 | wmb(); |
| 1185 | cpl->wr.wr_lo = htonl(V_WR_LEN(flits) | V_WR_GEN(gen) | |
| 1186 | V_WR_TID(q->token)); |
| 1187 | wr_gen2(d, gen); |
| 1188 | kfree_skb(skb); |
| 1189 | return; |
| 1190 | } |
| 1191 | |
| 1192 | flits = 2; |
| 1193 | } |
| 1194 | |
| 1195 | sgp = ndesc == 1 ? (struct sg_ent *)&d->flit[flits] : sgl; |
| 1196 | sgl_flits = make_sgl(skb, sgp, skb->data, skb_headlen(skb), adap->pdev); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1197 | |
| 1198 | write_wr_hdr_sgl(ndesc, skb, d, pidx, q, sgl, flits, sgl_flits, gen, |
| 1199 | htonl(V_WR_OP(FW_WROPCODE_TUNNEL_TX_PKT) | compl), |
| 1200 | htonl(V_WR_TID(q->token))); |
| 1201 | } |
| 1202 | |
Divy Le Ray | 82ad332 | 2008-12-16 01:09:39 -0800 | [diff] [blame] | 1203 | static inline void t3_stop_tx_queue(struct netdev_queue *txq, |
| 1204 | struct sge_qset *qs, struct sge_txq *q) |
Krishna Kumar | a8cc21f | 2008-01-30 12:30:16 +0530 | [diff] [blame] | 1205 | { |
Divy Le Ray | 82ad332 | 2008-12-16 01:09:39 -0800 | [diff] [blame] | 1206 | netif_tx_stop_queue(txq); |
Krishna Kumar | a8cc21f | 2008-01-30 12:30:16 +0530 | [diff] [blame] | 1207 | set_bit(TXQ_ETH, &qs->txq_stopped); |
| 1208 | q->stops++; |
| 1209 | } |
| 1210 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1211 | /** |
| 1212 | * eth_xmit - add a packet to the Ethernet Tx queue |
| 1213 | * @skb: the packet |
| 1214 | * @dev: the egress net device |
| 1215 | * |
| 1216 | * Add a packet to an SGE Tx queue. Runs with softirqs disabled. |
| 1217 | */ |
| 1218 | int t3_eth_xmit(struct sk_buff *skb, struct net_device *dev) |
| 1219 | { |
Divy Le Ray | 82ad332 | 2008-12-16 01:09:39 -0800 | [diff] [blame] | 1220 | int qidx; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1221 | unsigned int ndesc, pidx, credits, gen, compl; |
| 1222 | const struct port_info *pi = netdev_priv(dev); |
Divy Le Ray | 5fbf816 | 2007-08-29 19:15:47 -0700 | [diff] [blame] | 1223 | struct adapter *adap = pi->adapter; |
Divy Le Ray | 82ad332 | 2008-12-16 01:09:39 -0800 | [diff] [blame] | 1224 | struct netdev_queue *txq; |
| 1225 | struct sge_qset *qs; |
| 1226 | struct sge_txq *q; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1227 | |
| 1228 | /* |
| 1229 | * The chip min packet length is 9 octets but play safe and reject |
| 1230 | * anything shorter than an Ethernet header. |
| 1231 | */ |
| 1232 | if (unlikely(skb->len < ETH_HLEN)) { |
| 1233 | dev_kfree_skb(skb); |
| 1234 | return NETDEV_TX_OK; |
| 1235 | } |
| 1236 | |
Divy Le Ray | 82ad332 | 2008-12-16 01:09:39 -0800 | [diff] [blame] | 1237 | qidx = skb_get_queue_mapping(skb); |
| 1238 | qs = &pi->qs[qidx]; |
| 1239 | q = &qs->txq[TXQ_ETH]; |
| 1240 | txq = netdev_get_tx_queue(dev, qidx); |
| 1241 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1242 | spin_lock(&q->lock); |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 1243 | reclaim_completed_tx(adap, q, TX_RECLAIM_CHUNK); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1244 | |
| 1245 | credits = q->size - q->in_use; |
| 1246 | ndesc = calc_tx_descs(skb); |
| 1247 | |
| 1248 | if (unlikely(credits < ndesc)) { |
Divy Le Ray | 82ad332 | 2008-12-16 01:09:39 -0800 | [diff] [blame] | 1249 | t3_stop_tx_queue(txq, qs, q); |
Krishna Kumar | a8cc21f | 2008-01-30 12:30:16 +0530 | [diff] [blame] | 1250 | dev_err(&adap->pdev->dev, |
| 1251 | "%s: Tx ring %u full while queue awake!\n", |
| 1252 | dev->name, q->cntxt_id & 7); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1253 | spin_unlock(&q->lock); |
| 1254 | return NETDEV_TX_BUSY; |
| 1255 | } |
| 1256 | |
| 1257 | q->in_use += ndesc; |
Divy Le Ray | cd7e903 | 2008-03-13 00:13:30 -0700 | [diff] [blame] | 1258 | if (unlikely(credits - ndesc < q->stop_thres)) { |
Divy Le Ray | 82ad332 | 2008-12-16 01:09:39 -0800 | [diff] [blame] | 1259 | t3_stop_tx_queue(txq, qs, q); |
Divy Le Ray | cd7e903 | 2008-03-13 00:13:30 -0700 | [diff] [blame] | 1260 | |
| 1261 | if (should_restart_tx(q) && |
| 1262 | test_and_clear_bit(TXQ_ETH, &qs->txq_stopped)) { |
| 1263 | q->restarts++; |
Divy Le Ray | 82ad332 | 2008-12-16 01:09:39 -0800 | [diff] [blame] | 1264 | netif_tx_wake_queue(txq); |
Divy Le Ray | cd7e903 | 2008-03-13 00:13:30 -0700 | [diff] [blame] | 1265 | } |
| 1266 | } |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1267 | |
| 1268 | gen = q->gen; |
| 1269 | q->unacked += ndesc; |
| 1270 | compl = (q->unacked & 8) << (S_WR_COMPL - 3); |
| 1271 | q->unacked &= 7; |
| 1272 | pidx = q->pidx; |
| 1273 | q->pidx += ndesc; |
| 1274 | if (q->pidx >= q->size) { |
| 1275 | q->pidx -= q->size; |
| 1276 | q->gen ^= 1; |
| 1277 | } |
| 1278 | |
| 1279 | /* update port statistics */ |
| 1280 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
| 1281 | qs->port_stats[SGE_PSTAT_TX_CSUM]++; |
| 1282 | if (skb_shinfo(skb)->gso_size) |
| 1283 | qs->port_stats[SGE_PSTAT_TSO]++; |
| 1284 | if (vlan_tx_tag_present(skb) && pi->vlan_grp) |
| 1285 | qs->port_stats[SGE_PSTAT_VLANINS]++; |
| 1286 | |
| 1287 | dev->trans_start = jiffies; |
| 1288 | spin_unlock(&q->lock); |
| 1289 | |
| 1290 | /* |
| 1291 | * We do not use Tx completion interrupts to free DMAd Tx packets. |
| 1292 | * This is good for performamce but means that we rely on new Tx |
| 1293 | * packets arriving to run the destructors of completed packets, |
| 1294 | * which open up space in their sockets' send queues. Sometimes |
| 1295 | * we do not get such new packets causing Tx to stall. A single |
| 1296 | * UDP transmitter is a good example of this situation. We have |
| 1297 | * a clean up timer that periodically reclaims completed packets |
| 1298 | * but it doesn't run often enough (nor do we want it to) to prevent |
| 1299 | * lengthy stalls. A solution to this problem is to run the |
| 1300 | * destructor early, after the packet is queued but before it's DMAd. |
| 1301 | * A cons is that we lie to socket memory accounting, but the amount |
| 1302 | * of extra memory is reasonable (limited by the number of Tx |
| 1303 | * descriptors), the packets do actually get freed quickly by new |
| 1304 | * packets almost always, and for protocols like TCP that wait for |
| 1305 | * acks to really free up the data the extra memory is even less. |
| 1306 | * On the positive side we run the destructors on the sending CPU |
| 1307 | * rather than on a potentially different completing CPU, usually a |
| 1308 | * good thing. We also run them without holding our Tx queue lock, |
| 1309 | * unlike what reclaim_completed_tx() would otherwise do. |
| 1310 | * |
| 1311 | * Run the destructor before telling the DMA engine about the packet |
| 1312 | * to make sure it doesn't complete and get freed prematurely. |
| 1313 | */ |
| 1314 | if (likely(!skb_shared(skb))) |
| 1315 | skb_orphan(skb); |
| 1316 | |
| 1317 | write_tx_pkt_wr(adap, skb, pi, pidx, gen, q, ndesc, compl); |
| 1318 | check_ring_tx_db(adap, q); |
| 1319 | return NETDEV_TX_OK; |
| 1320 | } |
| 1321 | |
| 1322 | /** |
| 1323 | * write_imm - write a packet into a Tx descriptor as immediate data |
| 1324 | * @d: the Tx descriptor to write |
| 1325 | * @skb: the packet |
| 1326 | * @len: the length of packet data to write as immediate data |
| 1327 | * @gen: the generation bit value to write |
| 1328 | * |
| 1329 | * Writes a packet as immediate data into a Tx descriptor. The packet |
| 1330 | * contains a work request at its beginning. We must write the packet |
Divy Le Ray | 27186dc | 2007-08-21 20:49:15 -0700 | [diff] [blame] | 1331 | * carefully so the SGE doesn't read it accidentally before it's written |
| 1332 | * in its entirety. |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1333 | */ |
| 1334 | static inline void write_imm(struct tx_desc *d, struct sk_buff *skb, |
| 1335 | unsigned int len, unsigned int gen) |
| 1336 | { |
| 1337 | struct work_request_hdr *from = (struct work_request_hdr *)skb->data; |
| 1338 | struct work_request_hdr *to = (struct work_request_hdr *)d; |
| 1339 | |
Divy Le Ray | 27186dc | 2007-08-21 20:49:15 -0700 | [diff] [blame] | 1340 | if (likely(!skb->data_len)) |
| 1341 | memcpy(&to[1], &from[1], len - sizeof(*from)); |
| 1342 | else |
| 1343 | skb_copy_bits(skb, sizeof(*from), &to[1], len - sizeof(*from)); |
| 1344 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1345 | to->wr_hi = from->wr_hi | htonl(F_WR_SOP | F_WR_EOP | |
| 1346 | V_WR_BCNTLFLT(len & 7)); |
| 1347 | wmb(); |
| 1348 | to->wr_lo = from->wr_lo | htonl(V_WR_GEN(gen) | |
| 1349 | V_WR_LEN((len + 7) / 8)); |
| 1350 | wr_gen2(d, gen); |
| 1351 | kfree_skb(skb); |
| 1352 | } |
| 1353 | |
| 1354 | /** |
| 1355 | * check_desc_avail - check descriptor availability on a send queue |
| 1356 | * @adap: the adapter |
| 1357 | * @q: the send queue |
| 1358 | * @skb: the packet needing the descriptors |
| 1359 | * @ndesc: the number of Tx descriptors needed |
| 1360 | * @qid: the Tx queue number in its queue set (TXQ_OFLD or TXQ_CTRL) |
| 1361 | * |
| 1362 | * Checks if the requested number of Tx descriptors is available on an |
| 1363 | * SGE send queue. If the queue is already suspended or not enough |
| 1364 | * descriptors are available the packet is queued for later transmission. |
| 1365 | * Must be called with the Tx queue locked. |
| 1366 | * |
| 1367 | * Returns 0 if enough descriptors are available, 1 if there aren't |
| 1368 | * enough descriptors and the packet has been queued, and 2 if the caller |
| 1369 | * needs to retry because there weren't enough descriptors at the |
| 1370 | * beginning of the call but some freed up in the mean time. |
| 1371 | */ |
| 1372 | static inline int check_desc_avail(struct adapter *adap, struct sge_txq *q, |
| 1373 | struct sk_buff *skb, unsigned int ndesc, |
| 1374 | unsigned int qid) |
| 1375 | { |
| 1376 | if (unlikely(!skb_queue_empty(&q->sendq))) { |
| 1377 | addq_exit:__skb_queue_tail(&q->sendq, skb); |
| 1378 | return 1; |
| 1379 | } |
| 1380 | if (unlikely(q->size - q->in_use < ndesc)) { |
| 1381 | struct sge_qset *qs = txq_to_qset(q, qid); |
| 1382 | |
| 1383 | set_bit(qid, &qs->txq_stopped); |
| 1384 | smp_mb__after_clear_bit(); |
| 1385 | |
| 1386 | if (should_restart_tx(q) && |
| 1387 | test_and_clear_bit(qid, &qs->txq_stopped)) |
| 1388 | return 2; |
| 1389 | |
| 1390 | q->stops++; |
| 1391 | goto addq_exit; |
| 1392 | } |
| 1393 | return 0; |
| 1394 | } |
| 1395 | |
| 1396 | /** |
| 1397 | * reclaim_completed_tx_imm - reclaim completed control-queue Tx descs |
| 1398 | * @q: the SGE control Tx queue |
| 1399 | * |
| 1400 | * This is a variant of reclaim_completed_tx() that is used for Tx queues |
| 1401 | * that send only immediate data (presently just the control queues) and |
| 1402 | * thus do not have any sk_buffs to release. |
| 1403 | */ |
| 1404 | static inline void reclaim_completed_tx_imm(struct sge_txq *q) |
| 1405 | { |
| 1406 | unsigned int reclaim = q->processed - q->cleaned; |
| 1407 | |
| 1408 | q->in_use -= reclaim; |
| 1409 | q->cleaned += reclaim; |
| 1410 | } |
| 1411 | |
| 1412 | static inline int immediate(const struct sk_buff *skb) |
| 1413 | { |
Divy Le Ray | 27186dc | 2007-08-21 20:49:15 -0700 | [diff] [blame] | 1414 | return skb->len <= WR_LEN; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1415 | } |
| 1416 | |
| 1417 | /** |
| 1418 | * ctrl_xmit - send a packet through an SGE control Tx queue |
| 1419 | * @adap: the adapter |
| 1420 | * @q: the control queue |
| 1421 | * @skb: the packet |
| 1422 | * |
| 1423 | * Send a packet through an SGE control Tx queue. Packets sent through |
| 1424 | * a control queue must fit entirely as immediate data in a single Tx |
| 1425 | * descriptor and have no page fragments. |
| 1426 | */ |
| 1427 | static int ctrl_xmit(struct adapter *adap, struct sge_txq *q, |
| 1428 | struct sk_buff *skb) |
| 1429 | { |
| 1430 | int ret; |
| 1431 | struct work_request_hdr *wrp = (struct work_request_hdr *)skb->data; |
| 1432 | |
| 1433 | if (unlikely(!immediate(skb))) { |
| 1434 | WARN_ON(1); |
| 1435 | dev_kfree_skb(skb); |
| 1436 | return NET_XMIT_SUCCESS; |
| 1437 | } |
| 1438 | |
| 1439 | wrp->wr_hi |= htonl(F_WR_SOP | F_WR_EOP); |
| 1440 | wrp->wr_lo = htonl(V_WR_TID(q->token)); |
| 1441 | |
| 1442 | spin_lock(&q->lock); |
| 1443 | again:reclaim_completed_tx_imm(q); |
| 1444 | |
| 1445 | ret = check_desc_avail(adap, q, skb, 1, TXQ_CTRL); |
| 1446 | if (unlikely(ret)) { |
| 1447 | if (ret == 1) { |
| 1448 | spin_unlock(&q->lock); |
| 1449 | return NET_XMIT_CN; |
| 1450 | } |
| 1451 | goto again; |
| 1452 | } |
| 1453 | |
| 1454 | write_imm(&q->desc[q->pidx], skb, skb->len, q->gen); |
| 1455 | |
| 1456 | q->in_use++; |
| 1457 | if (++q->pidx >= q->size) { |
| 1458 | q->pidx = 0; |
| 1459 | q->gen ^= 1; |
| 1460 | } |
| 1461 | spin_unlock(&q->lock); |
| 1462 | wmb(); |
| 1463 | t3_write_reg(adap, A_SG_KDOORBELL, |
| 1464 | F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); |
| 1465 | return NET_XMIT_SUCCESS; |
| 1466 | } |
| 1467 | |
| 1468 | /** |
| 1469 | * restart_ctrlq - restart a suspended control queue |
| 1470 | * @qs: the queue set cotaining the control queue |
| 1471 | * |
| 1472 | * Resumes transmission on a suspended Tx control queue. |
| 1473 | */ |
| 1474 | static void restart_ctrlq(unsigned long data) |
| 1475 | { |
| 1476 | struct sk_buff *skb; |
| 1477 | struct sge_qset *qs = (struct sge_qset *)data; |
| 1478 | struct sge_txq *q = &qs->txq[TXQ_CTRL]; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1479 | |
| 1480 | spin_lock(&q->lock); |
| 1481 | again:reclaim_completed_tx_imm(q); |
| 1482 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1483 | while (q->in_use < q->size && |
| 1484 | (skb = __skb_dequeue(&q->sendq)) != NULL) { |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1485 | |
| 1486 | write_imm(&q->desc[q->pidx], skb, skb->len, q->gen); |
| 1487 | |
| 1488 | if (++q->pidx >= q->size) { |
| 1489 | q->pidx = 0; |
| 1490 | q->gen ^= 1; |
| 1491 | } |
| 1492 | q->in_use++; |
| 1493 | } |
| 1494 | |
| 1495 | if (!skb_queue_empty(&q->sendq)) { |
| 1496 | set_bit(TXQ_CTRL, &qs->txq_stopped); |
| 1497 | smp_mb__after_clear_bit(); |
| 1498 | |
| 1499 | if (should_restart_tx(q) && |
| 1500 | test_and_clear_bit(TXQ_CTRL, &qs->txq_stopped)) |
| 1501 | goto again; |
| 1502 | q->stops++; |
| 1503 | } |
| 1504 | |
| 1505 | spin_unlock(&q->lock); |
Divy Le Ray | afefce6 | 2007-11-16 11:22:21 -0800 | [diff] [blame] | 1506 | wmb(); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1507 | t3_write_reg(qs->adap, A_SG_KDOORBELL, |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1508 | F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); |
| 1509 | } |
| 1510 | |
Divy Le Ray | 14ab989 | 2007-01-30 19:43:50 -0800 | [diff] [blame] | 1511 | /* |
| 1512 | * Send a management message through control queue 0 |
| 1513 | */ |
| 1514 | int t3_mgmt_tx(struct adapter *adap, struct sk_buff *skb) |
| 1515 | { |
Divy Le Ray | 204e2f9 | 2008-05-06 19:26:01 -0700 | [diff] [blame] | 1516 | int ret; |
Divy Le Ray | bc4b6b52 | 2007-12-17 18:47:41 -0800 | [diff] [blame] | 1517 | local_bh_disable(); |
| 1518 | ret = ctrl_xmit(adap, &adap->sge.qs[0].txq[TXQ_CTRL], skb); |
| 1519 | local_bh_enable(); |
| 1520 | |
| 1521 | return ret; |
Divy Le Ray | 14ab989 | 2007-01-30 19:43:50 -0800 | [diff] [blame] | 1522 | } |
| 1523 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1524 | /** |
Divy Le Ray | 99d7cf3 | 2007-02-24 16:44:06 -0800 | [diff] [blame] | 1525 | * deferred_unmap_destructor - unmap a packet when it is freed |
| 1526 | * @skb: the packet |
| 1527 | * |
| 1528 | * This is the packet destructor used for Tx packets that need to remain |
| 1529 | * mapped until they are freed rather than until their Tx descriptors are |
| 1530 | * freed. |
| 1531 | */ |
| 1532 | static void deferred_unmap_destructor(struct sk_buff *skb) |
| 1533 | { |
| 1534 | int i; |
| 1535 | const dma_addr_t *p; |
| 1536 | const struct skb_shared_info *si; |
| 1537 | const struct deferred_unmap_info *dui; |
Divy Le Ray | 99d7cf3 | 2007-02-24 16:44:06 -0800 | [diff] [blame] | 1538 | |
| 1539 | dui = (struct deferred_unmap_info *)skb->head; |
| 1540 | p = dui->addr; |
| 1541 | |
Divy Le Ray | 23561c9 | 2007-11-16 11:22:05 -0800 | [diff] [blame] | 1542 | if (skb->tail - skb->transport_header) |
| 1543 | pci_unmap_single(dui->pdev, *p++, |
| 1544 | skb->tail - skb->transport_header, |
| 1545 | PCI_DMA_TODEVICE); |
Divy Le Ray | 99d7cf3 | 2007-02-24 16:44:06 -0800 | [diff] [blame] | 1546 | |
| 1547 | si = skb_shinfo(skb); |
| 1548 | for (i = 0; i < si->nr_frags; i++) |
| 1549 | pci_unmap_page(dui->pdev, *p++, si->frags[i].size, |
| 1550 | PCI_DMA_TODEVICE); |
| 1551 | } |
| 1552 | |
| 1553 | static void setup_deferred_unmapping(struct sk_buff *skb, struct pci_dev *pdev, |
| 1554 | const struct sg_ent *sgl, int sgl_flits) |
| 1555 | { |
| 1556 | dma_addr_t *p; |
| 1557 | struct deferred_unmap_info *dui; |
| 1558 | |
| 1559 | dui = (struct deferred_unmap_info *)skb->head; |
| 1560 | dui->pdev = pdev; |
| 1561 | for (p = dui->addr; sgl_flits >= 3; sgl++, sgl_flits -= 3) { |
| 1562 | *p++ = be64_to_cpu(sgl->addr[0]); |
| 1563 | *p++ = be64_to_cpu(sgl->addr[1]); |
| 1564 | } |
| 1565 | if (sgl_flits) |
| 1566 | *p = be64_to_cpu(sgl->addr[0]); |
| 1567 | } |
| 1568 | |
| 1569 | /** |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1570 | * write_ofld_wr - write an offload work request |
| 1571 | * @adap: the adapter |
| 1572 | * @skb: the packet to send |
| 1573 | * @q: the Tx queue |
| 1574 | * @pidx: index of the first Tx descriptor to write |
| 1575 | * @gen: the generation value to use |
| 1576 | * @ndesc: number of descriptors the packet will occupy |
| 1577 | * |
| 1578 | * Write an offload work request to send the supplied packet. The packet |
| 1579 | * data already carry the work request with most fields populated. |
| 1580 | */ |
| 1581 | static void write_ofld_wr(struct adapter *adap, struct sk_buff *skb, |
| 1582 | struct sge_txq *q, unsigned int pidx, |
| 1583 | unsigned int gen, unsigned int ndesc) |
| 1584 | { |
| 1585 | unsigned int sgl_flits, flits; |
| 1586 | struct work_request_hdr *from; |
| 1587 | struct sg_ent *sgp, sgl[MAX_SKB_FRAGS / 2 + 1]; |
| 1588 | struct tx_desc *d = &q->desc[pidx]; |
| 1589 | |
| 1590 | if (immediate(skb)) { |
| 1591 | q->sdesc[pidx].skb = NULL; |
| 1592 | write_imm(d, skb, skb->len, gen); |
| 1593 | return; |
| 1594 | } |
| 1595 | |
| 1596 | /* Only TX_DATA builds SGLs */ |
| 1597 | |
| 1598 | from = (struct work_request_hdr *)skb->data; |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 1599 | memcpy(&d->flit[1], &from[1], |
| 1600 | skb_transport_offset(skb) - sizeof(*from)); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1601 | |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 1602 | flits = skb_transport_offset(skb) / 8; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1603 | sgp = ndesc == 1 ? (struct sg_ent *)&d->flit[flits] : sgl; |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 1604 | sgl_flits = make_sgl(skb, sgp, skb_transport_header(skb), |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1605 | skb->tail - skb->transport_header, |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1606 | adap->pdev); |
Divy Le Ray | 99d7cf3 | 2007-02-24 16:44:06 -0800 | [diff] [blame] | 1607 | if (need_skb_unmap()) { |
| 1608 | setup_deferred_unmapping(skb, adap->pdev, sgp, sgl_flits); |
| 1609 | skb->destructor = deferred_unmap_destructor; |
Divy Le Ray | 99d7cf3 | 2007-02-24 16:44:06 -0800 | [diff] [blame] | 1610 | } |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1611 | |
| 1612 | write_wr_hdr_sgl(ndesc, skb, d, pidx, q, sgl, flits, sgl_flits, |
| 1613 | gen, from->wr_hi, from->wr_lo); |
| 1614 | } |
| 1615 | |
| 1616 | /** |
| 1617 | * calc_tx_descs_ofld - calculate # of Tx descriptors for an offload packet |
| 1618 | * @skb: the packet |
| 1619 | * |
| 1620 | * Returns the number of Tx descriptors needed for the given offload |
| 1621 | * packet. These packets are already fully constructed. |
| 1622 | */ |
| 1623 | static inline unsigned int calc_tx_descs_ofld(const struct sk_buff *skb) |
| 1624 | { |
Divy Le Ray | 27186dc | 2007-08-21 20:49:15 -0700 | [diff] [blame] | 1625 | unsigned int flits, cnt; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1626 | |
Divy Le Ray | 27186dc | 2007-08-21 20:49:15 -0700 | [diff] [blame] | 1627 | if (skb->len <= WR_LEN) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1628 | return 1; /* packet fits as immediate data */ |
| 1629 | |
Arnaldo Carvalho de Melo | ea2ae17 | 2007-04-25 17:55:53 -0700 | [diff] [blame] | 1630 | flits = skb_transport_offset(skb) / 8; /* headers */ |
Divy Le Ray | 27186dc | 2007-08-21 20:49:15 -0700 | [diff] [blame] | 1631 | cnt = skb_shinfo(skb)->nr_frags; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1632 | if (skb->tail != skb->transport_header) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1633 | cnt++; |
| 1634 | return flits_to_desc(flits + sgl_len(cnt)); |
| 1635 | } |
| 1636 | |
| 1637 | /** |
| 1638 | * ofld_xmit - send a packet through an offload queue |
| 1639 | * @adap: the adapter |
| 1640 | * @q: the Tx offload queue |
| 1641 | * @skb: the packet |
| 1642 | * |
| 1643 | * Send an offload packet through an SGE offload queue. |
| 1644 | */ |
| 1645 | static int ofld_xmit(struct adapter *adap, struct sge_txq *q, |
| 1646 | struct sk_buff *skb) |
| 1647 | { |
| 1648 | int ret; |
| 1649 | unsigned int ndesc = calc_tx_descs_ofld(skb), pidx, gen; |
| 1650 | |
| 1651 | spin_lock(&q->lock); |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 1652 | again: reclaim_completed_tx(adap, q, TX_RECLAIM_CHUNK); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1653 | |
| 1654 | ret = check_desc_avail(adap, q, skb, ndesc, TXQ_OFLD); |
| 1655 | if (unlikely(ret)) { |
| 1656 | if (ret == 1) { |
| 1657 | skb->priority = ndesc; /* save for restart */ |
| 1658 | spin_unlock(&q->lock); |
| 1659 | return NET_XMIT_CN; |
| 1660 | } |
| 1661 | goto again; |
| 1662 | } |
| 1663 | |
| 1664 | gen = q->gen; |
| 1665 | q->in_use += ndesc; |
| 1666 | pidx = q->pidx; |
| 1667 | q->pidx += ndesc; |
| 1668 | if (q->pidx >= q->size) { |
| 1669 | q->pidx -= q->size; |
| 1670 | q->gen ^= 1; |
| 1671 | } |
| 1672 | spin_unlock(&q->lock); |
| 1673 | |
| 1674 | write_ofld_wr(adap, skb, q, pidx, gen, ndesc); |
| 1675 | check_ring_tx_db(adap, q); |
| 1676 | return NET_XMIT_SUCCESS; |
| 1677 | } |
| 1678 | |
| 1679 | /** |
| 1680 | * restart_offloadq - restart a suspended offload queue |
| 1681 | * @qs: the queue set cotaining the offload queue |
| 1682 | * |
| 1683 | * Resumes transmission on a suspended Tx offload queue. |
| 1684 | */ |
| 1685 | static void restart_offloadq(unsigned long data) |
| 1686 | { |
| 1687 | struct sk_buff *skb; |
| 1688 | struct sge_qset *qs = (struct sge_qset *)data; |
| 1689 | struct sge_txq *q = &qs->txq[TXQ_OFLD]; |
Divy Le Ray | 5fbf816 | 2007-08-29 19:15:47 -0700 | [diff] [blame] | 1690 | const struct port_info *pi = netdev_priv(qs->netdev); |
| 1691 | struct adapter *adap = pi->adapter; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1692 | |
| 1693 | spin_lock(&q->lock); |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 1694 | again: reclaim_completed_tx(adap, q, TX_RECLAIM_CHUNK); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1695 | |
| 1696 | while ((skb = skb_peek(&q->sendq)) != NULL) { |
| 1697 | unsigned int gen, pidx; |
| 1698 | unsigned int ndesc = skb->priority; |
| 1699 | |
| 1700 | if (unlikely(q->size - q->in_use < ndesc)) { |
| 1701 | set_bit(TXQ_OFLD, &qs->txq_stopped); |
| 1702 | smp_mb__after_clear_bit(); |
| 1703 | |
| 1704 | if (should_restart_tx(q) && |
| 1705 | test_and_clear_bit(TXQ_OFLD, &qs->txq_stopped)) |
| 1706 | goto again; |
| 1707 | q->stops++; |
| 1708 | break; |
| 1709 | } |
| 1710 | |
| 1711 | gen = q->gen; |
| 1712 | q->in_use += ndesc; |
| 1713 | pidx = q->pidx; |
| 1714 | q->pidx += ndesc; |
| 1715 | if (q->pidx >= q->size) { |
| 1716 | q->pidx -= q->size; |
| 1717 | q->gen ^= 1; |
| 1718 | } |
| 1719 | __skb_unlink(skb, &q->sendq); |
| 1720 | spin_unlock(&q->lock); |
| 1721 | |
| 1722 | write_ofld_wr(adap, skb, q, pidx, gen, ndesc); |
| 1723 | spin_lock(&q->lock); |
| 1724 | } |
| 1725 | spin_unlock(&q->lock); |
| 1726 | |
| 1727 | #if USE_GTS |
| 1728 | set_bit(TXQ_RUNNING, &q->flags); |
| 1729 | set_bit(TXQ_LAST_PKT_DB, &q->flags); |
| 1730 | #endif |
Divy Le Ray | afefce6 | 2007-11-16 11:22:21 -0800 | [diff] [blame] | 1731 | wmb(); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1732 | t3_write_reg(adap, A_SG_KDOORBELL, |
| 1733 | F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); |
| 1734 | } |
| 1735 | |
| 1736 | /** |
| 1737 | * queue_set - return the queue set a packet should use |
| 1738 | * @skb: the packet |
| 1739 | * |
| 1740 | * Maps a packet to the SGE queue set it should use. The desired queue |
| 1741 | * set is carried in bits 1-3 in the packet's priority. |
| 1742 | */ |
| 1743 | static inline int queue_set(const struct sk_buff *skb) |
| 1744 | { |
| 1745 | return skb->priority >> 1; |
| 1746 | } |
| 1747 | |
| 1748 | /** |
| 1749 | * is_ctrl_pkt - return whether an offload packet is a control packet |
| 1750 | * @skb: the packet |
| 1751 | * |
| 1752 | * Determines whether an offload packet should use an OFLD or a CTRL |
| 1753 | * Tx queue. This is indicated by bit 0 in the packet's priority. |
| 1754 | */ |
| 1755 | static inline int is_ctrl_pkt(const struct sk_buff *skb) |
| 1756 | { |
| 1757 | return skb->priority & 1; |
| 1758 | } |
| 1759 | |
| 1760 | /** |
| 1761 | * t3_offload_tx - send an offload packet |
| 1762 | * @tdev: the offload device to send to |
| 1763 | * @skb: the packet |
| 1764 | * |
| 1765 | * Sends an offload packet. We use the packet priority to select the |
| 1766 | * appropriate Tx queue as follows: bit 0 indicates whether the packet |
| 1767 | * should be sent as regular or control, bits 1-3 select the queue set. |
| 1768 | */ |
| 1769 | int t3_offload_tx(struct t3cdev *tdev, struct sk_buff *skb) |
| 1770 | { |
| 1771 | struct adapter *adap = tdev2adap(tdev); |
| 1772 | struct sge_qset *qs = &adap->sge.qs[queue_set(skb)]; |
| 1773 | |
| 1774 | if (unlikely(is_ctrl_pkt(skb))) |
| 1775 | return ctrl_xmit(adap, &qs->txq[TXQ_CTRL], skb); |
| 1776 | |
| 1777 | return ofld_xmit(adap, &qs->txq[TXQ_OFLD], skb); |
| 1778 | } |
| 1779 | |
| 1780 | /** |
| 1781 | * offload_enqueue - add an offload packet to an SGE offload receive queue |
| 1782 | * @q: the SGE response queue |
| 1783 | * @skb: the packet |
| 1784 | * |
| 1785 | * Add a new offload packet to an SGE response queue's offload packet |
| 1786 | * queue. If the packet is the first on the queue it schedules the RX |
| 1787 | * softirq to process the queue. |
| 1788 | */ |
| 1789 | static inline void offload_enqueue(struct sge_rspq *q, struct sk_buff *skb) |
| 1790 | { |
David S. Miller | 147e70e | 2008-09-22 01:29:52 -0700 | [diff] [blame] | 1791 | int was_empty = skb_queue_empty(&q->rx_queue); |
| 1792 | |
| 1793 | __skb_queue_tail(&q->rx_queue, skb); |
| 1794 | |
| 1795 | if (was_empty) { |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1796 | struct sge_qset *qs = rspq_to_qset(q); |
| 1797 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1798 | napi_schedule(&qs->napi); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1799 | } |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1800 | } |
| 1801 | |
| 1802 | /** |
| 1803 | * deliver_partial_bundle - deliver a (partial) bundle of Rx offload pkts |
| 1804 | * @tdev: the offload device that will be receiving the packets |
| 1805 | * @q: the SGE response queue that assembled the bundle |
| 1806 | * @skbs: the partial bundle |
| 1807 | * @n: the number of packets in the bundle |
| 1808 | * |
| 1809 | * Delivers a (partial) bundle of Rx offload packets to an offload device. |
| 1810 | */ |
| 1811 | static inline void deliver_partial_bundle(struct t3cdev *tdev, |
| 1812 | struct sge_rspq *q, |
| 1813 | struct sk_buff *skbs[], int n) |
| 1814 | { |
| 1815 | if (n) { |
| 1816 | q->offload_bundles++; |
| 1817 | tdev->recv(tdev, skbs, n); |
| 1818 | } |
| 1819 | } |
| 1820 | |
| 1821 | /** |
| 1822 | * ofld_poll - NAPI handler for offload packets in interrupt mode |
| 1823 | * @dev: the network device doing the polling |
| 1824 | * @budget: polling budget |
| 1825 | * |
| 1826 | * The NAPI handler for offload packets when a response queue is serviced |
| 1827 | * by the hard interrupt handler, i.e., when it's operating in non-polling |
| 1828 | * mode. Creates small packet batches and sends them through the offload |
| 1829 | * receive handler. Batches need to be of modest size as we do prefetches |
| 1830 | * on the packets in each. |
| 1831 | */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1832 | static int ofld_poll(struct napi_struct *napi, int budget) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1833 | { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1834 | struct sge_qset *qs = container_of(napi, struct sge_qset, napi); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1835 | struct sge_rspq *q = &qs->rspq; |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1836 | struct adapter *adapter = qs->adap; |
| 1837 | int work_done = 0; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1838 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1839 | while (work_done < budget) { |
David S. Miller | 147e70e | 2008-09-22 01:29:52 -0700 | [diff] [blame] | 1840 | struct sk_buff *skb, *tmp, *skbs[RX_BUNDLE_SIZE]; |
| 1841 | struct sk_buff_head queue; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1842 | int ngathered; |
| 1843 | |
| 1844 | spin_lock_irq(&q->lock); |
David S. Miller | 147e70e | 2008-09-22 01:29:52 -0700 | [diff] [blame] | 1845 | __skb_queue_head_init(&queue); |
| 1846 | skb_queue_splice_init(&q->rx_queue, &queue); |
| 1847 | if (skb_queue_empty(&queue)) { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1848 | napi_complete(napi); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1849 | spin_unlock_irq(&q->lock); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1850 | return work_done; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1851 | } |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1852 | spin_unlock_irq(&q->lock); |
| 1853 | |
David S. Miller | 147e70e | 2008-09-22 01:29:52 -0700 | [diff] [blame] | 1854 | ngathered = 0; |
| 1855 | skb_queue_walk_safe(&queue, skb, tmp) { |
| 1856 | if (work_done >= budget) |
| 1857 | break; |
| 1858 | work_done++; |
| 1859 | |
| 1860 | __skb_unlink(skb, &queue); |
| 1861 | prefetch(skb->data); |
| 1862 | skbs[ngathered] = skb; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1863 | if (++ngathered == RX_BUNDLE_SIZE) { |
| 1864 | q->offload_bundles++; |
| 1865 | adapter->tdev.recv(&adapter->tdev, skbs, |
| 1866 | ngathered); |
| 1867 | ngathered = 0; |
| 1868 | } |
| 1869 | } |
David S. Miller | 147e70e | 2008-09-22 01:29:52 -0700 | [diff] [blame] | 1870 | if (!skb_queue_empty(&queue)) { |
| 1871 | /* splice remaining packets back onto Rx queue */ |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1872 | spin_lock_irq(&q->lock); |
David S. Miller | 147e70e | 2008-09-22 01:29:52 -0700 | [diff] [blame] | 1873 | skb_queue_splice(&queue, &q->rx_queue); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1874 | spin_unlock_irq(&q->lock); |
| 1875 | } |
| 1876 | deliver_partial_bundle(&adapter->tdev, q, skbs, ngathered); |
| 1877 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1878 | |
| 1879 | return work_done; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1880 | } |
| 1881 | |
| 1882 | /** |
| 1883 | * rx_offload - process a received offload packet |
| 1884 | * @tdev: the offload device receiving the packet |
| 1885 | * @rq: the response queue that received the packet |
| 1886 | * @skb: the packet |
| 1887 | * @rx_gather: a gather list of packets if we are building a bundle |
| 1888 | * @gather_idx: index of the next available slot in the bundle |
| 1889 | * |
| 1890 | * Process an ingress offload pakcet and add it to the offload ingress |
| 1891 | * queue. Returns the index of the next available slot in the bundle. |
| 1892 | */ |
| 1893 | static inline int rx_offload(struct t3cdev *tdev, struct sge_rspq *rq, |
| 1894 | struct sk_buff *skb, struct sk_buff *rx_gather[], |
| 1895 | unsigned int gather_idx) |
| 1896 | { |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1897 | skb_reset_mac_header(skb); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 1898 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 1899 | skb_reset_transport_header(skb); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1900 | |
| 1901 | if (rq->polling) { |
| 1902 | rx_gather[gather_idx++] = skb; |
| 1903 | if (gather_idx == RX_BUNDLE_SIZE) { |
| 1904 | tdev->recv(tdev, rx_gather, RX_BUNDLE_SIZE); |
| 1905 | gather_idx = 0; |
| 1906 | rq->offload_bundles++; |
| 1907 | } |
| 1908 | } else |
| 1909 | offload_enqueue(rq, skb); |
| 1910 | |
| 1911 | return gather_idx; |
| 1912 | } |
| 1913 | |
| 1914 | /** |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1915 | * restart_tx - check whether to restart suspended Tx queues |
| 1916 | * @qs: the queue set to resume |
| 1917 | * |
| 1918 | * Restarts suspended Tx queues of an SGE queue set if they have enough |
| 1919 | * free resources to resume operation. |
| 1920 | */ |
| 1921 | static void restart_tx(struct sge_qset *qs) |
| 1922 | { |
| 1923 | if (test_bit(TXQ_ETH, &qs->txq_stopped) && |
| 1924 | should_restart_tx(&qs->txq[TXQ_ETH]) && |
| 1925 | test_and_clear_bit(TXQ_ETH, &qs->txq_stopped)) { |
| 1926 | qs->txq[TXQ_ETH].restarts++; |
| 1927 | if (netif_running(qs->netdev)) |
Divy Le Ray | 82ad332 | 2008-12-16 01:09:39 -0800 | [diff] [blame] | 1928 | netif_tx_wake_queue(qs->tx_q); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1929 | } |
| 1930 | |
| 1931 | if (test_bit(TXQ_OFLD, &qs->txq_stopped) && |
| 1932 | should_restart_tx(&qs->txq[TXQ_OFLD]) && |
| 1933 | test_and_clear_bit(TXQ_OFLD, &qs->txq_stopped)) { |
| 1934 | qs->txq[TXQ_OFLD].restarts++; |
| 1935 | tasklet_schedule(&qs->txq[TXQ_OFLD].qresume_tsk); |
| 1936 | } |
| 1937 | if (test_bit(TXQ_CTRL, &qs->txq_stopped) && |
| 1938 | should_restart_tx(&qs->txq[TXQ_CTRL]) && |
| 1939 | test_and_clear_bit(TXQ_CTRL, &qs->txq_stopped)) { |
| 1940 | qs->txq[TXQ_CTRL].restarts++; |
| 1941 | tasklet_schedule(&qs->txq[TXQ_CTRL].qresume_tsk); |
| 1942 | } |
| 1943 | } |
| 1944 | |
| 1945 | /** |
Karen Xie | a109a5b | 2008-12-18 22:56:20 -0800 | [diff] [blame] | 1946 | * cxgb3_arp_process - process an ARP request probing a private IP address |
| 1947 | * @adapter: the adapter |
| 1948 | * @skb: the skbuff containing the ARP request |
| 1949 | * |
| 1950 | * Check if the ARP request is probing the private IP address |
| 1951 | * dedicated to iSCSI, generate an ARP reply if so. |
| 1952 | */ |
| 1953 | static void cxgb3_arp_process(struct adapter *adapter, struct sk_buff *skb) |
| 1954 | { |
| 1955 | struct net_device *dev = skb->dev; |
| 1956 | struct port_info *pi; |
| 1957 | struct arphdr *arp; |
| 1958 | unsigned char *arp_ptr; |
| 1959 | unsigned char *sha; |
| 1960 | __be32 sip, tip; |
| 1961 | |
| 1962 | if (!dev) |
| 1963 | return; |
| 1964 | |
| 1965 | skb_reset_network_header(skb); |
| 1966 | arp = arp_hdr(skb); |
| 1967 | |
| 1968 | if (arp->ar_op != htons(ARPOP_REQUEST)) |
| 1969 | return; |
| 1970 | |
| 1971 | arp_ptr = (unsigned char *)(arp + 1); |
| 1972 | sha = arp_ptr; |
| 1973 | arp_ptr += dev->addr_len; |
| 1974 | memcpy(&sip, arp_ptr, sizeof(sip)); |
| 1975 | arp_ptr += sizeof(sip); |
| 1976 | arp_ptr += dev->addr_len; |
| 1977 | memcpy(&tip, arp_ptr, sizeof(tip)); |
| 1978 | |
| 1979 | pi = netdev_priv(dev); |
| 1980 | if (tip != pi->iscsi_ipv4addr) |
| 1981 | return; |
| 1982 | |
| 1983 | arp_send(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, |
| 1984 | dev->dev_addr, sha); |
| 1985 | |
| 1986 | } |
| 1987 | |
| 1988 | static inline int is_arp(struct sk_buff *skb) |
| 1989 | { |
| 1990 | return skb->protocol == htons(ETH_P_ARP); |
| 1991 | } |
| 1992 | |
| 1993 | /** |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 1994 | * rx_eth - process an ingress ethernet packet |
| 1995 | * @adap: the adapter |
| 1996 | * @rq: the response queue that received the packet |
| 1997 | * @skb: the packet |
| 1998 | * @pad: amount of padding at the start of the buffer |
| 1999 | * |
| 2000 | * Process an ingress ethernet pakcet and deliver it to the stack. |
| 2001 | * The padding is 2 if the packet was delivered in an Rx buffer and 0 |
| 2002 | * if it was immediate data in a response. |
| 2003 | */ |
| 2004 | static void rx_eth(struct adapter *adap, struct sge_rspq *rq, |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2005 | struct sk_buff *skb, int pad, int lro) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2006 | { |
| 2007 | struct cpl_rx_pkt *p = (struct cpl_rx_pkt *)(skb->data + pad); |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2008 | struct sge_qset *qs = rspq_to_qset(rq); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2009 | struct port_info *pi; |
| 2010 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2011 | skb_pull(skb, sizeof(*p) + pad); |
Arnaldo Carvalho de Melo | 4c13eb6 | 2007-04-25 17:40:23 -0700 | [diff] [blame] | 2012 | skb->protocol = eth_type_trans(skb, adap->port[p->iff]); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2013 | pi = netdev_priv(skb->dev); |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 2014 | if ((pi->rx_offload & T3_RX_CSUM) && p->csum_valid && |
| 2015 | p->csum == htons(0xffff) && !p->fragment) { |
Karen Xie | a109a5b | 2008-12-18 22:56:20 -0800 | [diff] [blame] | 2016 | qs->port_stats[SGE_PSTAT_RX_CSUM_GOOD]++; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2017 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 2018 | } else |
| 2019 | skb->ip_summed = CHECKSUM_NONE; |
David S. Miller | 0c8dfc8 | 2009-01-27 16:22:32 -0800 | [diff] [blame] | 2020 | skb_record_rx_queue(skb, qs - &adap->sge.qs[0]); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2021 | |
| 2022 | if (unlikely(p->vlan_valid)) { |
| 2023 | struct vlan_group *grp = pi->vlan_grp; |
| 2024 | |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2025 | qs->port_stats[SGE_PSTAT_VLANEX]++; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2026 | if (likely(grp)) |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2027 | if (lro) |
Herbert Xu | 7be2df4 | 2009-01-21 14:39:13 -0800 | [diff] [blame] | 2028 | vlan_gro_receive(&qs->napi, grp, |
| 2029 | ntohs(p->vlan), skb); |
Karen Xie | a109a5b | 2008-12-18 22:56:20 -0800 | [diff] [blame] | 2030 | else { |
| 2031 | if (unlikely(pi->iscsi_ipv4addr && |
| 2032 | is_arp(skb))) { |
| 2033 | unsigned short vtag = ntohs(p->vlan) & |
| 2034 | VLAN_VID_MASK; |
| 2035 | skb->dev = vlan_group_get_device(grp, |
| 2036 | vtag); |
| 2037 | cxgb3_arp_process(adap, skb); |
| 2038 | } |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2039 | __vlan_hwaccel_rx(skb, grp, ntohs(p->vlan), |
| 2040 | rq->polling); |
Karen Xie | a109a5b | 2008-12-18 22:56:20 -0800 | [diff] [blame] | 2041 | } |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2042 | else |
| 2043 | dev_kfree_skb_any(skb); |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2044 | } else if (rq->polling) { |
| 2045 | if (lro) |
Herbert Xu | 7be2df4 | 2009-01-21 14:39:13 -0800 | [diff] [blame] | 2046 | napi_gro_receive(&qs->napi, skb); |
Karen Xie | a109a5b | 2008-12-18 22:56:20 -0800 | [diff] [blame] | 2047 | else { |
| 2048 | if (unlikely(pi->iscsi_ipv4addr && is_arp(skb))) |
| 2049 | cxgb3_arp_process(adap, skb); |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2050 | netif_receive_skb(skb); |
Karen Xie | a109a5b | 2008-12-18 22:56:20 -0800 | [diff] [blame] | 2051 | } |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2052 | } else |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2053 | netif_rx(skb); |
| 2054 | } |
| 2055 | |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2056 | static inline int is_eth_tcp(u32 rss) |
| 2057 | { |
| 2058 | return G_HASHTYPE(ntohl(rss)) == RSS_HASH_4_TUPLE; |
| 2059 | } |
| 2060 | |
| 2061 | /** |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2062 | * lro_add_page - add a page chunk to an LRO session |
| 2063 | * @adap: the adapter |
| 2064 | * @qs: the associated queue set |
| 2065 | * @fl: the free list containing the page chunk to add |
| 2066 | * @len: packet length |
| 2067 | * @complete: Indicates the last fragment of a frame |
| 2068 | * |
| 2069 | * Add a received packet contained in a page chunk to an existing LRO |
| 2070 | * session. |
| 2071 | */ |
| 2072 | static void lro_add_page(struct adapter *adap, struct sge_qset *qs, |
| 2073 | struct sge_fl *fl, int len, int complete) |
| 2074 | { |
| 2075 | struct rx_sw_desc *sd = &fl->sdesc[fl->cidx]; |
| 2076 | struct cpl_rx_pkt *cpl; |
Herbert Xu | 7be2df4 | 2009-01-21 14:39:13 -0800 | [diff] [blame] | 2077 | struct skb_frag_struct *rx_frag = qs->lro_frag_tbl.frags; |
| 2078 | int nr_frags = qs->lro_frag_tbl.nr_frags; |
| 2079 | int frag_len = qs->lro_frag_tbl.len; |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2080 | int offset = 0; |
| 2081 | |
| 2082 | if (!nr_frags) { |
| 2083 | offset = 2 + sizeof(struct cpl_rx_pkt); |
| 2084 | qs->lro_va = cpl = sd->pg_chunk.va + 2; |
| 2085 | } |
| 2086 | |
| 2087 | fl->credits--; |
| 2088 | |
| 2089 | len -= offset; |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 2090 | pci_dma_sync_single_for_cpu(adap->pdev, |
| 2091 | pci_unmap_addr(sd, dma_addr), |
| 2092 | fl->buf_size - SGE_PG_RSVD, |
| 2093 | PCI_DMA_FROMDEVICE); |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2094 | |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 2095 | (*sd->pg_chunk.p_cnt)--; |
| 2096 | if (!*sd->pg_chunk.p_cnt) |
| 2097 | pci_unmap_page(adap->pdev, |
Divy Le Ray | 10b6d95 | 2009-05-28 11:23:02 +0000 | [diff] [blame] | 2098 | sd->pg_chunk.mapping, |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 2099 | fl->alloc_size, |
| 2100 | PCI_DMA_FROMDEVICE); |
| 2101 | |
| 2102 | prefetch(qs->lro_va); |
Divy Le Ray | b2b964f | 2009-03-12 21:13:59 +0000 | [diff] [blame] | 2103 | |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2104 | rx_frag += nr_frags; |
| 2105 | rx_frag->page = sd->pg_chunk.page; |
| 2106 | rx_frag->page_offset = sd->pg_chunk.offset + offset; |
| 2107 | rx_frag->size = len; |
| 2108 | frag_len += len; |
Herbert Xu | 7be2df4 | 2009-01-21 14:39:13 -0800 | [diff] [blame] | 2109 | qs->lro_frag_tbl.nr_frags++; |
| 2110 | qs->lro_frag_tbl.len = frag_len; |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2111 | |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 2112 | |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2113 | if (!complete) |
| 2114 | return; |
| 2115 | |
Herbert Xu | 7be2df4 | 2009-01-21 14:39:13 -0800 | [diff] [blame] | 2116 | qs->lro_frag_tbl.ip_summed = CHECKSUM_UNNECESSARY; |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2117 | cpl = qs->lro_va; |
| 2118 | |
| 2119 | if (unlikely(cpl->vlan_valid)) { |
| 2120 | struct net_device *dev = qs->netdev; |
| 2121 | struct port_info *pi = netdev_priv(dev); |
| 2122 | struct vlan_group *grp = pi->vlan_grp; |
| 2123 | |
| 2124 | if (likely(grp != NULL)) { |
Herbert Xu | 7be2df4 | 2009-01-21 14:39:13 -0800 | [diff] [blame] | 2125 | vlan_gro_frags(&qs->napi, grp, ntohs(cpl->vlan), |
| 2126 | &qs->lro_frag_tbl); |
| 2127 | goto out; |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2128 | } |
| 2129 | } |
Herbert Xu | 7be2df4 | 2009-01-21 14:39:13 -0800 | [diff] [blame] | 2130 | napi_gro_frags(&qs->napi, &qs->lro_frag_tbl); |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2131 | |
Herbert Xu | 7be2df4 | 2009-01-21 14:39:13 -0800 | [diff] [blame] | 2132 | out: |
| 2133 | qs->lro_frag_tbl.nr_frags = qs->lro_frag_tbl.len = 0; |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2134 | } |
| 2135 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2136 | /** |
| 2137 | * handle_rsp_cntrl_info - handles control information in a response |
| 2138 | * @qs: the queue set corresponding to the response |
| 2139 | * @flags: the response control flags |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2140 | * |
| 2141 | * Handles the control information of an SGE response, such as GTS |
| 2142 | * indications and completion credits for the queue set's Tx queues. |
Divy Le Ray | 6195c71 | 2007-01-30 19:43:56 -0800 | [diff] [blame] | 2143 | * HW coalesces credits, we don't do any extra SW coalescing. |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2144 | */ |
Divy Le Ray | 6195c71 | 2007-01-30 19:43:56 -0800 | [diff] [blame] | 2145 | static inline void handle_rsp_cntrl_info(struct sge_qset *qs, u32 flags) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2146 | { |
| 2147 | unsigned int credits; |
| 2148 | |
| 2149 | #if USE_GTS |
| 2150 | if (flags & F_RSPD_TXQ0_GTS) |
| 2151 | clear_bit(TXQ_RUNNING, &qs->txq[TXQ_ETH].flags); |
| 2152 | #endif |
| 2153 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2154 | credits = G_RSPD_TXQ0_CR(flags); |
| 2155 | if (credits) |
| 2156 | qs->txq[TXQ_ETH].processed += credits; |
| 2157 | |
Divy Le Ray | 6195c71 | 2007-01-30 19:43:56 -0800 | [diff] [blame] | 2158 | credits = G_RSPD_TXQ2_CR(flags); |
| 2159 | if (credits) |
| 2160 | qs->txq[TXQ_CTRL].processed += credits; |
| 2161 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2162 | # if USE_GTS |
| 2163 | if (flags & F_RSPD_TXQ1_GTS) |
| 2164 | clear_bit(TXQ_RUNNING, &qs->txq[TXQ_OFLD].flags); |
| 2165 | # endif |
Divy Le Ray | 6195c71 | 2007-01-30 19:43:56 -0800 | [diff] [blame] | 2166 | credits = G_RSPD_TXQ1_CR(flags); |
| 2167 | if (credits) |
| 2168 | qs->txq[TXQ_OFLD].processed += credits; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2169 | } |
| 2170 | |
| 2171 | /** |
| 2172 | * check_ring_db - check if we need to ring any doorbells |
| 2173 | * @adapter: the adapter |
| 2174 | * @qs: the queue set whose Tx queues are to be examined |
| 2175 | * @sleeping: indicates which Tx queue sent GTS |
| 2176 | * |
| 2177 | * Checks if some of a queue set's Tx queues need to ring their doorbells |
| 2178 | * to resume transmission after idling while they still have unprocessed |
| 2179 | * descriptors. |
| 2180 | */ |
| 2181 | static void check_ring_db(struct adapter *adap, struct sge_qset *qs, |
| 2182 | unsigned int sleeping) |
| 2183 | { |
| 2184 | if (sleeping & F_RSPD_TXQ0_GTS) { |
| 2185 | struct sge_txq *txq = &qs->txq[TXQ_ETH]; |
| 2186 | |
| 2187 | if (txq->cleaned + txq->in_use != txq->processed && |
| 2188 | !test_and_set_bit(TXQ_LAST_PKT_DB, &txq->flags)) { |
| 2189 | set_bit(TXQ_RUNNING, &txq->flags); |
| 2190 | t3_write_reg(adap, A_SG_KDOORBELL, F_SELEGRCNTX | |
| 2191 | V_EGRCNTX(txq->cntxt_id)); |
| 2192 | } |
| 2193 | } |
| 2194 | |
| 2195 | if (sleeping & F_RSPD_TXQ1_GTS) { |
| 2196 | struct sge_txq *txq = &qs->txq[TXQ_OFLD]; |
| 2197 | |
| 2198 | if (txq->cleaned + txq->in_use != txq->processed && |
| 2199 | !test_and_set_bit(TXQ_LAST_PKT_DB, &txq->flags)) { |
| 2200 | set_bit(TXQ_RUNNING, &txq->flags); |
| 2201 | t3_write_reg(adap, A_SG_KDOORBELL, F_SELEGRCNTX | |
| 2202 | V_EGRCNTX(txq->cntxt_id)); |
| 2203 | } |
| 2204 | } |
| 2205 | } |
| 2206 | |
| 2207 | /** |
| 2208 | * is_new_response - check if a response is newly written |
| 2209 | * @r: the response descriptor |
| 2210 | * @q: the response queue |
| 2211 | * |
| 2212 | * Returns true if a response descriptor contains a yet unprocessed |
| 2213 | * response. |
| 2214 | */ |
| 2215 | static inline int is_new_response(const struct rsp_desc *r, |
| 2216 | const struct sge_rspq *q) |
| 2217 | { |
| 2218 | return (r->intr_gen & F_RSPD_GEN2) == q->gen; |
| 2219 | } |
| 2220 | |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 2221 | static inline void clear_rspq_bufstate(struct sge_rspq * const q) |
| 2222 | { |
| 2223 | q->pg_skb = NULL; |
| 2224 | q->rx_recycle_buf = 0; |
| 2225 | } |
| 2226 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2227 | #define RSPD_GTS_MASK (F_RSPD_TXQ0_GTS | F_RSPD_TXQ1_GTS) |
| 2228 | #define RSPD_CTRL_MASK (RSPD_GTS_MASK | \ |
| 2229 | V_RSPD_TXQ0_CR(M_RSPD_TXQ0_CR) | \ |
| 2230 | V_RSPD_TXQ1_CR(M_RSPD_TXQ1_CR) | \ |
| 2231 | V_RSPD_TXQ2_CR(M_RSPD_TXQ2_CR)) |
| 2232 | |
| 2233 | /* How long to delay the next interrupt in case of memory shortage, in 0.1us. */ |
| 2234 | #define NOMEM_INTR_DELAY 2500 |
| 2235 | |
| 2236 | /** |
| 2237 | * process_responses - process responses from an SGE response queue |
| 2238 | * @adap: the adapter |
| 2239 | * @qs: the queue set to which the response queue belongs |
| 2240 | * @budget: how many responses can be processed in this round |
| 2241 | * |
| 2242 | * Process responses from an SGE response queue up to the supplied budget. |
| 2243 | * Responses include received packets as well as credits and other events |
| 2244 | * for the queues that belong to the response queue's queue set. |
| 2245 | * A negative budget is effectively unlimited. |
| 2246 | * |
| 2247 | * Additionally choose the interrupt holdoff time for the next interrupt |
| 2248 | * on this queue. If the system is under memory shortage use a fairly |
| 2249 | * long delay to help recovery. |
| 2250 | */ |
| 2251 | static int process_responses(struct adapter *adap, struct sge_qset *qs, |
| 2252 | int budget) |
| 2253 | { |
| 2254 | struct sge_rspq *q = &qs->rspq; |
| 2255 | struct rsp_desc *r = &q->desc[q->cidx]; |
| 2256 | int budget_left = budget; |
Divy Le Ray | 6195c71 | 2007-01-30 19:43:56 -0800 | [diff] [blame] | 2257 | unsigned int sleeping = 0; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2258 | struct sk_buff *offload_skbs[RX_BUNDLE_SIZE]; |
| 2259 | int ngathered = 0; |
| 2260 | |
| 2261 | q->next_holdoff = q->holdoff_tmr; |
| 2262 | |
| 2263 | while (likely(budget_left && is_new_response(r, q))) { |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2264 | int packet_complete, eth, ethpad = 2, lro = qs->lro_enabled; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2265 | struct sk_buff *skb = NULL; |
| 2266 | u32 len, flags = ntohl(r->flags); |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 2267 | __be32 rss_hi = *(const __be32 *)r, |
| 2268 | rss_lo = r->rss_hdr.rss_hash_val; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2269 | |
| 2270 | eth = r->rss_hdr.opcode == CPL_RX_PKT; |
| 2271 | |
| 2272 | if (unlikely(flags & F_RSPD_ASYNC_NOTIF)) { |
| 2273 | skb = alloc_skb(AN_PKT_SIZE, GFP_ATOMIC); |
| 2274 | if (!skb) |
| 2275 | goto no_mem; |
| 2276 | |
| 2277 | memcpy(__skb_put(skb, AN_PKT_SIZE), r, AN_PKT_SIZE); |
| 2278 | skb->data[0] = CPL_ASYNC_NOTIF; |
| 2279 | rss_hi = htonl(CPL_ASYNC_NOTIF << 24); |
| 2280 | q->async_notif++; |
| 2281 | } else if (flags & F_RSPD_IMM_DATA_VALID) { |
| 2282 | skb = get_imm_packet(r); |
| 2283 | if (unlikely(!skb)) { |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 2284 | no_mem: |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2285 | q->next_holdoff = NOMEM_INTR_DELAY; |
| 2286 | q->nomem++; |
| 2287 | /* consume one credit since we tried */ |
| 2288 | budget_left--; |
| 2289 | break; |
| 2290 | } |
| 2291 | q->imm_data++; |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 2292 | ethpad = 0; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2293 | } else if ((len = ntohl(r->len_cq)) != 0) { |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 2294 | struct sge_fl *fl; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2295 | |
Divy Le Ray | 65ab838 | 2009-02-04 16:31:39 -0800 | [diff] [blame] | 2296 | lro &= eth && is_eth_tcp(rss_hi); |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2297 | |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 2298 | fl = (len & F_RSPD_FLQ) ? &qs->fl[1] : &qs->fl[0]; |
| 2299 | if (fl->use_pages) { |
| 2300 | void *addr = fl->sdesc[fl->cidx].pg_chunk.va; |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 2301 | |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 2302 | prefetch(&qs->lro_frag_tbl); |
| 2303 | |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 2304 | prefetch(addr); |
| 2305 | #if L1_CACHE_BYTES < 128 |
| 2306 | prefetch(addr + L1_CACHE_BYTES); |
| 2307 | #endif |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 2308 | __refill_fl(adap, fl); |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2309 | if (lro > 0) { |
| 2310 | lro_add_page(adap, qs, fl, |
| 2311 | G_RSPD_LEN(len), |
| 2312 | flags & F_RSPD_EOP); |
| 2313 | goto next_fl; |
| 2314 | } |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 2315 | |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 2316 | skb = get_packet_pg(adap, fl, q, |
| 2317 | G_RSPD_LEN(len), |
| 2318 | eth ? |
| 2319 | SGE_RX_DROP_THRES : 0); |
| 2320 | q->pg_skb = skb; |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 2321 | } else |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 2322 | skb = get_packet(adap, fl, G_RSPD_LEN(len), |
| 2323 | eth ? SGE_RX_DROP_THRES : 0); |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 2324 | if (unlikely(!skb)) { |
| 2325 | if (!eth) |
| 2326 | goto no_mem; |
| 2327 | q->rx_drops++; |
| 2328 | } else if (unlikely(r->rss_hdr.opcode == CPL_TRACE_PKT)) |
| 2329 | __skb_pull(skb, 2); |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2330 | next_fl: |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2331 | if (++fl->cidx == fl->size) |
| 2332 | fl->cidx = 0; |
| 2333 | } else |
| 2334 | q->pure_rsps++; |
| 2335 | |
| 2336 | if (flags & RSPD_CTRL_MASK) { |
| 2337 | sleeping |= flags & RSPD_GTS_MASK; |
Divy Le Ray | 6195c71 | 2007-01-30 19:43:56 -0800 | [diff] [blame] | 2338 | handle_rsp_cntrl_info(qs, flags); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2339 | } |
| 2340 | |
| 2341 | r++; |
| 2342 | if (unlikely(++q->cidx == q->size)) { |
| 2343 | q->cidx = 0; |
| 2344 | q->gen ^= 1; |
| 2345 | r = q->desc; |
| 2346 | } |
| 2347 | prefetch(r); |
| 2348 | |
| 2349 | if (++q->credits >= (q->size / 4)) { |
| 2350 | refill_rspq(adap, q, q->credits); |
| 2351 | q->credits = 0; |
| 2352 | } |
| 2353 | |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 2354 | packet_complete = flags & |
| 2355 | (F_RSPD_EOP | F_RSPD_IMM_DATA_VALID | |
| 2356 | F_RSPD_ASYNC_NOTIF); |
| 2357 | |
| 2358 | if (skb != NULL && packet_complete) { |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2359 | if (eth) |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2360 | rx_eth(adap, q, skb, ethpad, lro); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2361 | else { |
Divy Le Ray | afefce6 | 2007-11-16 11:22:21 -0800 | [diff] [blame] | 2362 | q->offload_pkts++; |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 2363 | /* Preserve the RSS info in csum & priority */ |
| 2364 | skb->csum = rss_hi; |
| 2365 | skb->priority = rss_lo; |
| 2366 | ngathered = rx_offload(&adap->tdev, q, skb, |
| 2367 | offload_skbs, |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 2368 | ngathered); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2369 | } |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 2370 | |
| 2371 | if (flags & F_RSPD_EOP) |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2372 | clear_rspq_bufstate(q); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2373 | } |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2374 | --budget_left; |
| 2375 | } |
| 2376 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2377 | deliver_partial_bundle(&adap->tdev, q, offload_skbs, ngathered); |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 2378 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2379 | if (sleeping) |
| 2380 | check_ring_db(adap, qs, sleeping); |
| 2381 | |
| 2382 | smp_mb(); /* commit Tx queue .processed updates */ |
| 2383 | if (unlikely(qs->txq_stopped != 0)) |
| 2384 | restart_tx(qs); |
| 2385 | |
| 2386 | budget -= budget_left; |
| 2387 | return budget; |
| 2388 | } |
| 2389 | |
| 2390 | static inline int is_pure_response(const struct rsp_desc *r) |
| 2391 | { |
Roland Dreier | c5419e6 | 2008-11-28 21:55:42 -0800 | [diff] [blame] | 2392 | __be32 n = r->flags & htonl(F_RSPD_ASYNC_NOTIF | F_RSPD_IMM_DATA_VALID); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2393 | |
| 2394 | return (n | r->len_cq) == 0; |
| 2395 | } |
| 2396 | |
| 2397 | /** |
| 2398 | * napi_rx_handler - the NAPI handler for Rx processing |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2399 | * @napi: the napi instance |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2400 | * @budget: how many packets we can process in this round |
| 2401 | * |
| 2402 | * Handler for new data events when using NAPI. |
| 2403 | */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2404 | static int napi_rx_handler(struct napi_struct *napi, int budget) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2405 | { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2406 | struct sge_qset *qs = container_of(napi, struct sge_qset, napi); |
| 2407 | struct adapter *adap = qs->adap; |
| 2408 | int work_done = process_responses(adap, qs, budget); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2409 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2410 | if (likely(work_done < budget)) { |
| 2411 | napi_complete(napi); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2412 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2413 | /* |
| 2414 | * Because we don't atomically flush the following |
| 2415 | * write it is possible that in very rare cases it can |
| 2416 | * reach the device in a way that races with a new |
| 2417 | * response being written plus an error interrupt |
| 2418 | * causing the NAPI interrupt handler below to return |
| 2419 | * unhandled status to the OS. To protect against |
| 2420 | * this would require flushing the write and doing |
| 2421 | * both the write and the flush with interrupts off. |
| 2422 | * Way too expensive and unjustifiable given the |
| 2423 | * rarity of the race. |
| 2424 | * |
| 2425 | * The race cannot happen at all with MSI-X. |
| 2426 | */ |
| 2427 | t3_write_reg(adap, A_SG_GTS, V_RSPQ(qs->rspq.cntxt_id) | |
| 2428 | V_NEWTIMER(qs->rspq.next_holdoff) | |
| 2429 | V_NEWINDEX(qs->rspq.cidx)); |
| 2430 | } |
| 2431 | return work_done; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2432 | } |
| 2433 | |
| 2434 | /* |
| 2435 | * Returns true if the device is already scheduled for polling. |
| 2436 | */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2437 | static inline int napi_is_scheduled(struct napi_struct *napi) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2438 | { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2439 | return test_bit(NAPI_STATE_SCHED, &napi->state); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2440 | } |
| 2441 | |
| 2442 | /** |
| 2443 | * process_pure_responses - process pure responses from a response queue |
| 2444 | * @adap: the adapter |
| 2445 | * @qs: the queue set owning the response queue |
| 2446 | * @r: the first pure response to process |
| 2447 | * |
| 2448 | * A simpler version of process_responses() that handles only pure (i.e., |
| 2449 | * non data-carrying) responses. Such respones are too light-weight to |
| 2450 | * justify calling a softirq under NAPI, so we handle them specially in |
| 2451 | * the interrupt handler. The function is called with a pointer to a |
| 2452 | * response, which the caller must ensure is a valid pure response. |
| 2453 | * |
| 2454 | * Returns 1 if it encounters a valid data-carrying response, 0 otherwise. |
| 2455 | */ |
| 2456 | static int process_pure_responses(struct adapter *adap, struct sge_qset *qs, |
| 2457 | struct rsp_desc *r) |
| 2458 | { |
| 2459 | struct sge_rspq *q = &qs->rspq; |
Divy Le Ray | 6195c71 | 2007-01-30 19:43:56 -0800 | [diff] [blame] | 2460 | unsigned int sleeping = 0; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2461 | |
| 2462 | do { |
| 2463 | u32 flags = ntohl(r->flags); |
| 2464 | |
| 2465 | r++; |
| 2466 | if (unlikely(++q->cidx == q->size)) { |
| 2467 | q->cidx = 0; |
| 2468 | q->gen ^= 1; |
| 2469 | r = q->desc; |
| 2470 | } |
| 2471 | prefetch(r); |
| 2472 | |
| 2473 | if (flags & RSPD_CTRL_MASK) { |
| 2474 | sleeping |= flags & RSPD_GTS_MASK; |
Divy Le Ray | 6195c71 | 2007-01-30 19:43:56 -0800 | [diff] [blame] | 2475 | handle_rsp_cntrl_info(qs, flags); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2476 | } |
| 2477 | |
| 2478 | q->pure_rsps++; |
| 2479 | if (++q->credits >= (q->size / 4)) { |
| 2480 | refill_rspq(adap, q, q->credits); |
| 2481 | q->credits = 0; |
| 2482 | } |
| 2483 | } while (is_new_response(r, q) && is_pure_response(r)); |
| 2484 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2485 | if (sleeping) |
| 2486 | check_ring_db(adap, qs, sleeping); |
| 2487 | |
| 2488 | smp_mb(); /* commit Tx queue .processed updates */ |
| 2489 | if (unlikely(qs->txq_stopped != 0)) |
| 2490 | restart_tx(qs); |
| 2491 | |
| 2492 | return is_new_response(r, q); |
| 2493 | } |
| 2494 | |
| 2495 | /** |
| 2496 | * handle_responses - decide what to do with new responses in NAPI mode |
| 2497 | * @adap: the adapter |
| 2498 | * @q: the response queue |
| 2499 | * |
| 2500 | * This is used by the NAPI interrupt handlers to decide what to do with |
| 2501 | * new SGE responses. If there are no new responses it returns -1. If |
| 2502 | * there are new responses and they are pure (i.e., non-data carrying) |
| 2503 | * it handles them straight in hard interrupt context as they are very |
| 2504 | * cheap and don't deliver any packets. Finally, if there are any data |
| 2505 | * signaling responses it schedules the NAPI handler. Returns 1 if it |
| 2506 | * schedules NAPI, 0 if all new responses were pure. |
| 2507 | * |
| 2508 | * The caller must ascertain NAPI is not already running. |
| 2509 | */ |
| 2510 | static inline int handle_responses(struct adapter *adap, struct sge_rspq *q) |
| 2511 | { |
| 2512 | struct sge_qset *qs = rspq_to_qset(q); |
| 2513 | struct rsp_desc *r = &q->desc[q->cidx]; |
| 2514 | |
| 2515 | if (!is_new_response(r, q)) |
| 2516 | return -1; |
| 2517 | if (is_pure_response(r) && process_pure_responses(adap, qs, r) == 0) { |
| 2518 | t3_write_reg(adap, A_SG_GTS, V_RSPQ(q->cntxt_id) | |
| 2519 | V_NEWTIMER(q->holdoff_tmr) | V_NEWINDEX(q->cidx)); |
| 2520 | return 0; |
| 2521 | } |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2522 | napi_schedule(&qs->napi); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2523 | return 1; |
| 2524 | } |
| 2525 | |
| 2526 | /* |
| 2527 | * The MSI-X interrupt handler for an SGE response queue for the non-NAPI case |
| 2528 | * (i.e., response queue serviced in hard interrupt). |
| 2529 | */ |
| 2530 | irqreturn_t t3_sge_intr_msix(int irq, void *cookie) |
| 2531 | { |
| 2532 | struct sge_qset *qs = cookie; |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2533 | struct adapter *adap = qs->adap; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2534 | struct sge_rspq *q = &qs->rspq; |
| 2535 | |
| 2536 | spin_lock(&q->lock); |
| 2537 | if (process_responses(adap, qs, -1) == 0) |
| 2538 | q->unhandled_irqs++; |
| 2539 | t3_write_reg(adap, A_SG_GTS, V_RSPQ(q->cntxt_id) | |
| 2540 | V_NEWTIMER(q->next_holdoff) | V_NEWINDEX(q->cidx)); |
| 2541 | spin_unlock(&q->lock); |
| 2542 | return IRQ_HANDLED; |
| 2543 | } |
| 2544 | |
| 2545 | /* |
| 2546 | * The MSI-X interrupt handler for an SGE response queue for the NAPI case |
| 2547 | * (i.e., response queue serviced by NAPI polling). |
| 2548 | */ |
Stephen Hemminger | 9265fab | 2007-10-08 16:22:29 -0700 | [diff] [blame] | 2549 | static irqreturn_t t3_sge_intr_msix_napi(int irq, void *cookie) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2550 | { |
| 2551 | struct sge_qset *qs = cookie; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2552 | struct sge_rspq *q = &qs->rspq; |
| 2553 | |
| 2554 | spin_lock(&q->lock); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2555 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2556 | if (handle_responses(qs->adap, q) < 0) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2557 | q->unhandled_irqs++; |
| 2558 | spin_unlock(&q->lock); |
| 2559 | return IRQ_HANDLED; |
| 2560 | } |
| 2561 | |
| 2562 | /* |
| 2563 | * The non-NAPI MSI interrupt handler. This needs to handle data events from |
| 2564 | * SGE response queues as well as error and other async events as they all use |
| 2565 | * the same MSI vector. We use one SGE response queue per port in this mode |
| 2566 | * and protect all response queues with queue 0's lock. |
| 2567 | */ |
| 2568 | static irqreturn_t t3_intr_msi(int irq, void *cookie) |
| 2569 | { |
| 2570 | int new_packets = 0; |
| 2571 | struct adapter *adap = cookie; |
| 2572 | struct sge_rspq *q = &adap->sge.qs[0].rspq; |
| 2573 | |
| 2574 | spin_lock(&q->lock); |
| 2575 | |
| 2576 | if (process_responses(adap, &adap->sge.qs[0], -1)) { |
| 2577 | t3_write_reg(adap, A_SG_GTS, V_RSPQ(q->cntxt_id) | |
| 2578 | V_NEWTIMER(q->next_holdoff) | V_NEWINDEX(q->cidx)); |
| 2579 | new_packets = 1; |
| 2580 | } |
| 2581 | |
| 2582 | if (adap->params.nports == 2 && |
| 2583 | process_responses(adap, &adap->sge.qs[1], -1)) { |
| 2584 | struct sge_rspq *q1 = &adap->sge.qs[1].rspq; |
| 2585 | |
| 2586 | t3_write_reg(adap, A_SG_GTS, V_RSPQ(q1->cntxt_id) | |
| 2587 | V_NEWTIMER(q1->next_holdoff) | |
| 2588 | V_NEWINDEX(q1->cidx)); |
| 2589 | new_packets = 1; |
| 2590 | } |
| 2591 | |
| 2592 | if (!new_packets && t3_slow_intr_handler(adap) == 0) |
| 2593 | q->unhandled_irqs++; |
| 2594 | |
| 2595 | spin_unlock(&q->lock); |
| 2596 | return IRQ_HANDLED; |
| 2597 | } |
| 2598 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2599 | static int rspq_check_napi(struct sge_qset *qs) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2600 | { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2601 | struct sge_rspq *q = &qs->rspq; |
| 2602 | |
| 2603 | if (!napi_is_scheduled(&qs->napi) && |
| 2604 | is_new_response(&q->desc[q->cidx], q)) { |
| 2605 | napi_schedule(&qs->napi); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2606 | return 1; |
| 2607 | } |
| 2608 | return 0; |
| 2609 | } |
| 2610 | |
| 2611 | /* |
| 2612 | * The MSI interrupt handler for the NAPI case (i.e., response queues serviced |
| 2613 | * by NAPI polling). Handles data events from SGE response queues as well as |
| 2614 | * error and other async events as they all use the same MSI vector. We use |
| 2615 | * one SGE response queue per port in this mode and protect all response |
| 2616 | * queues with queue 0's lock. |
| 2617 | */ |
Stephen Hemminger | 9265fab | 2007-10-08 16:22:29 -0700 | [diff] [blame] | 2618 | static irqreturn_t t3_intr_msi_napi(int irq, void *cookie) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2619 | { |
| 2620 | int new_packets; |
| 2621 | struct adapter *adap = cookie; |
| 2622 | struct sge_rspq *q = &adap->sge.qs[0].rspq; |
| 2623 | |
| 2624 | spin_lock(&q->lock); |
| 2625 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2626 | new_packets = rspq_check_napi(&adap->sge.qs[0]); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2627 | if (adap->params.nports == 2) |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2628 | new_packets += rspq_check_napi(&adap->sge.qs[1]); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2629 | if (!new_packets && t3_slow_intr_handler(adap) == 0) |
| 2630 | q->unhandled_irqs++; |
| 2631 | |
| 2632 | spin_unlock(&q->lock); |
| 2633 | return IRQ_HANDLED; |
| 2634 | } |
| 2635 | |
| 2636 | /* |
| 2637 | * A helper function that processes responses and issues GTS. |
| 2638 | */ |
| 2639 | static inline int process_responses_gts(struct adapter *adap, |
| 2640 | struct sge_rspq *rq) |
| 2641 | { |
| 2642 | int work; |
| 2643 | |
| 2644 | work = process_responses(adap, rspq_to_qset(rq), -1); |
| 2645 | t3_write_reg(adap, A_SG_GTS, V_RSPQ(rq->cntxt_id) | |
| 2646 | V_NEWTIMER(rq->next_holdoff) | V_NEWINDEX(rq->cidx)); |
| 2647 | return work; |
| 2648 | } |
| 2649 | |
| 2650 | /* |
| 2651 | * The legacy INTx interrupt handler. This needs to handle data events from |
| 2652 | * SGE response queues as well as error and other async events as they all use |
| 2653 | * the same interrupt pin. We use one SGE response queue per port in this mode |
| 2654 | * and protect all response queues with queue 0's lock. |
| 2655 | */ |
| 2656 | static irqreturn_t t3_intr(int irq, void *cookie) |
| 2657 | { |
| 2658 | int work_done, w0, w1; |
| 2659 | struct adapter *adap = cookie; |
| 2660 | struct sge_rspq *q0 = &adap->sge.qs[0].rspq; |
| 2661 | struct sge_rspq *q1 = &adap->sge.qs[1].rspq; |
| 2662 | |
| 2663 | spin_lock(&q0->lock); |
| 2664 | |
| 2665 | w0 = is_new_response(&q0->desc[q0->cidx], q0); |
| 2666 | w1 = adap->params.nports == 2 && |
| 2667 | is_new_response(&q1->desc[q1->cidx], q1); |
| 2668 | |
| 2669 | if (likely(w0 | w1)) { |
| 2670 | t3_write_reg(adap, A_PL_CLI, 0); |
| 2671 | t3_read_reg(adap, A_PL_CLI); /* flush */ |
| 2672 | |
| 2673 | if (likely(w0)) |
| 2674 | process_responses_gts(adap, q0); |
| 2675 | |
| 2676 | if (w1) |
| 2677 | process_responses_gts(adap, q1); |
| 2678 | |
| 2679 | work_done = w0 | w1; |
| 2680 | } else |
| 2681 | work_done = t3_slow_intr_handler(adap); |
| 2682 | |
| 2683 | spin_unlock(&q0->lock); |
| 2684 | return IRQ_RETVAL(work_done != 0); |
| 2685 | } |
| 2686 | |
| 2687 | /* |
| 2688 | * Interrupt handler for legacy INTx interrupts for T3B-based cards. |
| 2689 | * Handles data events from SGE response queues as well as error and other |
| 2690 | * async events as they all use the same interrupt pin. We use one SGE |
| 2691 | * response queue per port in this mode and protect all response queues with |
| 2692 | * queue 0's lock. |
| 2693 | */ |
| 2694 | static irqreturn_t t3b_intr(int irq, void *cookie) |
| 2695 | { |
| 2696 | u32 map; |
| 2697 | struct adapter *adap = cookie; |
| 2698 | struct sge_rspq *q0 = &adap->sge.qs[0].rspq; |
| 2699 | |
| 2700 | t3_write_reg(adap, A_PL_CLI, 0); |
| 2701 | map = t3_read_reg(adap, A_SG_DATA_INTR); |
| 2702 | |
| 2703 | if (unlikely(!map)) /* shared interrupt, most likely */ |
| 2704 | return IRQ_NONE; |
| 2705 | |
| 2706 | spin_lock(&q0->lock); |
| 2707 | |
| 2708 | if (unlikely(map & F_ERRINTR)) |
| 2709 | t3_slow_intr_handler(adap); |
| 2710 | |
| 2711 | if (likely(map & 1)) |
| 2712 | process_responses_gts(adap, q0); |
| 2713 | |
| 2714 | if (map & 2) |
| 2715 | process_responses_gts(adap, &adap->sge.qs[1].rspq); |
| 2716 | |
| 2717 | spin_unlock(&q0->lock); |
| 2718 | return IRQ_HANDLED; |
| 2719 | } |
| 2720 | |
| 2721 | /* |
| 2722 | * NAPI interrupt handler for legacy INTx interrupts for T3B-based cards. |
| 2723 | * Handles data events from SGE response queues as well as error and other |
| 2724 | * async events as they all use the same interrupt pin. We use one SGE |
| 2725 | * response queue per port in this mode and protect all response queues with |
| 2726 | * queue 0's lock. |
| 2727 | */ |
| 2728 | static irqreturn_t t3b_intr_napi(int irq, void *cookie) |
| 2729 | { |
| 2730 | u32 map; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2731 | struct adapter *adap = cookie; |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2732 | struct sge_qset *qs0 = &adap->sge.qs[0]; |
| 2733 | struct sge_rspq *q0 = &qs0->rspq; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2734 | |
| 2735 | t3_write_reg(adap, A_PL_CLI, 0); |
| 2736 | map = t3_read_reg(adap, A_SG_DATA_INTR); |
| 2737 | |
| 2738 | if (unlikely(!map)) /* shared interrupt, most likely */ |
| 2739 | return IRQ_NONE; |
| 2740 | |
| 2741 | spin_lock(&q0->lock); |
| 2742 | |
| 2743 | if (unlikely(map & F_ERRINTR)) |
| 2744 | t3_slow_intr_handler(adap); |
| 2745 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2746 | if (likely(map & 1)) |
| 2747 | napi_schedule(&qs0->napi); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2748 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2749 | if (map & 2) |
| 2750 | napi_schedule(&adap->sge.qs[1].napi); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2751 | |
| 2752 | spin_unlock(&q0->lock); |
| 2753 | return IRQ_HANDLED; |
| 2754 | } |
| 2755 | |
| 2756 | /** |
| 2757 | * t3_intr_handler - select the top-level interrupt handler |
| 2758 | * @adap: the adapter |
| 2759 | * @polling: whether using NAPI to service response queues |
| 2760 | * |
| 2761 | * Selects the top-level interrupt handler based on the type of interrupts |
| 2762 | * (MSI-X, MSI, or legacy) and whether NAPI will be used to service the |
| 2763 | * response queues. |
| 2764 | */ |
Jeff Garzik | 7c23997 | 2007-10-19 03:12:20 -0400 | [diff] [blame] | 2765 | irq_handler_t t3_intr_handler(struct adapter *adap, int polling) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2766 | { |
| 2767 | if (adap->flags & USING_MSIX) |
| 2768 | return polling ? t3_sge_intr_msix_napi : t3_sge_intr_msix; |
| 2769 | if (adap->flags & USING_MSI) |
| 2770 | return polling ? t3_intr_msi_napi : t3_intr_msi; |
| 2771 | if (adap->params.rev > 0) |
| 2772 | return polling ? t3b_intr_napi : t3b_intr; |
| 2773 | return t3_intr; |
| 2774 | } |
| 2775 | |
Divy Le Ray | b881955 | 2007-12-17 18:47:31 -0800 | [diff] [blame] | 2776 | #define SGE_PARERR (F_CPPARITYERROR | F_OCPARITYERROR | F_RCPARITYERROR | \ |
| 2777 | F_IRPARITYERROR | V_ITPARITYERROR(M_ITPARITYERROR) | \ |
| 2778 | V_FLPARITYERROR(M_FLPARITYERROR) | F_LODRBPARITYERROR | \ |
| 2779 | F_HIDRBPARITYERROR | F_LORCQPARITYERROR | \ |
| 2780 | F_HIRCQPARITYERROR) |
| 2781 | #define SGE_FRAMINGERR (F_UC_REQ_FRAMINGERROR | F_R_REQ_FRAMINGERROR) |
| 2782 | #define SGE_FATALERR (SGE_PARERR | SGE_FRAMINGERR | F_RSPQCREDITOVERFOW | \ |
| 2783 | F_RSPQDISABLED) |
| 2784 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2785 | /** |
| 2786 | * t3_sge_err_intr_handler - SGE async event interrupt handler |
| 2787 | * @adapter: the adapter |
| 2788 | * |
| 2789 | * Interrupt handler for SGE asynchronous (non-data) events. |
| 2790 | */ |
| 2791 | void t3_sge_err_intr_handler(struct adapter *adapter) |
| 2792 | { |
Divy Le Ray | fc88219 | 2009-03-12 21:14:09 +0000 | [diff] [blame] | 2793 | unsigned int v, status = t3_read_reg(adapter, A_SG_INT_CAUSE) & |
| 2794 | ~F_FLEMPTY; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2795 | |
Divy Le Ray | b881955 | 2007-12-17 18:47:31 -0800 | [diff] [blame] | 2796 | if (status & SGE_PARERR) |
| 2797 | CH_ALERT(adapter, "SGE parity error (0x%x)\n", |
| 2798 | status & SGE_PARERR); |
| 2799 | if (status & SGE_FRAMINGERR) |
| 2800 | CH_ALERT(adapter, "SGE framing error (0x%x)\n", |
| 2801 | status & SGE_FRAMINGERR); |
| 2802 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2803 | if (status & F_RSPQCREDITOVERFOW) |
| 2804 | CH_ALERT(adapter, "SGE response queue credit overflow\n"); |
| 2805 | |
| 2806 | if (status & F_RSPQDISABLED) { |
| 2807 | v = t3_read_reg(adapter, A_SG_RSPQ_FL_STATUS); |
| 2808 | |
| 2809 | CH_ALERT(adapter, |
| 2810 | "packet delivered to disabled response queue " |
| 2811 | "(0x%x)\n", (v >> S_RSPQ0DISABLED) & 0xff); |
| 2812 | } |
| 2813 | |
Divy Le Ray | 6e3f03b | 2007-08-21 20:49:10 -0700 | [diff] [blame] | 2814 | if (status & (F_HIPIODRBDROPERR | F_LOPIODRBDROPERR)) |
| 2815 | CH_ALERT(adapter, "SGE dropped %s priority doorbell\n", |
| 2816 | status & F_HIPIODRBDROPERR ? "high" : "lo"); |
| 2817 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2818 | t3_write_reg(adapter, A_SG_INT_CAUSE, status); |
Divy Le Ray | b881955 | 2007-12-17 18:47:31 -0800 | [diff] [blame] | 2819 | if (status & SGE_FATALERR) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2820 | t3_fatal_err(adapter); |
| 2821 | } |
| 2822 | |
| 2823 | /** |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 2824 | * sge_timer_tx - perform periodic maintenance of an SGE qset |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2825 | * @data: the SGE queue set to maintain |
| 2826 | * |
| 2827 | * Runs periodically from a timer to perform maintenance of an SGE queue |
| 2828 | * set. It performs two tasks: |
| 2829 | * |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 2830 | * Cleans up any completed Tx descriptors that may still be pending. |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2831 | * Normal descriptor cleanup happens when new packets are added to a Tx |
| 2832 | * queue so this timer is relatively infrequent and does any cleanup only |
| 2833 | * if the Tx queue has not seen any new packets in a while. We make a |
| 2834 | * best effort attempt to reclaim descriptors, in that we don't wait |
| 2835 | * around if we cannot get a queue's lock (which most likely is because |
| 2836 | * someone else is queueing new packets and so will also handle the clean |
| 2837 | * up). Since control queues use immediate data exclusively we don't |
| 2838 | * bother cleaning them up here. |
| 2839 | * |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 2840 | */ |
| 2841 | static void sge_timer_tx(unsigned long data) |
| 2842 | { |
| 2843 | struct sge_qset *qs = (struct sge_qset *)data; |
| 2844 | struct port_info *pi = netdev_priv(qs->netdev); |
| 2845 | struct adapter *adap = pi->adapter; |
| 2846 | unsigned int tbd[SGE_TXQ_PER_SET] = {0, 0}; |
| 2847 | unsigned long next_period; |
| 2848 | |
| 2849 | if (spin_trylock(&qs->txq[TXQ_ETH].lock)) { |
| 2850 | tbd[TXQ_ETH] = reclaim_completed_tx(adap, &qs->txq[TXQ_ETH], |
| 2851 | TX_RECLAIM_TIMER_CHUNK); |
| 2852 | spin_unlock(&qs->txq[TXQ_ETH].lock); |
| 2853 | } |
| 2854 | if (spin_trylock(&qs->txq[TXQ_OFLD].lock)) { |
| 2855 | tbd[TXQ_OFLD] = reclaim_completed_tx(adap, &qs->txq[TXQ_OFLD], |
| 2856 | TX_RECLAIM_TIMER_CHUNK); |
| 2857 | spin_unlock(&qs->txq[TXQ_OFLD].lock); |
| 2858 | } |
| 2859 | |
| 2860 | next_period = TX_RECLAIM_PERIOD >> |
| 2861 | (max(tbd[TXQ_ETH], tbd[TXQ_OFLD]) / |
| 2862 | TX_RECLAIM_TIMER_CHUNK); |
| 2863 | mod_timer(&qs->tx_reclaim_timer, jiffies + next_period); |
| 2864 | } |
| 2865 | |
| 2866 | /* |
| 2867 | * sge_timer_rx - perform periodic maintenance of an SGE qset |
| 2868 | * @data: the SGE queue set to maintain |
| 2869 | * |
| 2870 | * a) Replenishes Rx queues that have run out due to memory shortage. |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2871 | * Normally new Rx buffers are added when existing ones are consumed but |
| 2872 | * when out of memory a queue can become empty. We try to add only a few |
| 2873 | * buffers here, the queue will be replenished fully as these new buffers |
| 2874 | * are used up if memory shortage has subsided. |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 2875 | * |
| 2876 | * b) Return coalesced response queue credits in case a response queue is |
| 2877 | * starved. |
| 2878 | * |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2879 | */ |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 2880 | static void sge_timer_rx(unsigned long data) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2881 | { |
| 2882 | spinlock_t *lock; |
| 2883 | struct sge_qset *qs = (struct sge_qset *)data; |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 2884 | struct port_info *pi = netdev_priv(qs->netdev); |
| 2885 | struct adapter *adap = pi->adapter; |
| 2886 | u32 status; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2887 | |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 2888 | lock = adap->params.rev > 0 ? |
| 2889 | &qs->rspq.lock : &adap->sge.qs[0].rspq.lock; |
Divy Le Ray | bae73f4 | 2007-02-24 16:44:12 -0800 | [diff] [blame] | 2890 | |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 2891 | if (!spin_trylock_irq(lock)) |
| 2892 | goto out; |
Divy Le Ray | bae73f4 | 2007-02-24 16:44:12 -0800 | [diff] [blame] | 2893 | |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 2894 | if (napi_is_scheduled(&qs->napi)) |
| 2895 | goto unlock; |
| 2896 | |
| 2897 | if (adap->params.rev < 4) { |
| 2898 | status = t3_read_reg(adap, A_SG_RSPQ_FL_STATUS); |
| 2899 | |
| 2900 | if (status & (1 << qs->rspq.cntxt_id)) { |
| 2901 | qs->rspq.starved++; |
| 2902 | if (qs->rspq.credits) { |
| 2903 | qs->rspq.credits--; |
| 2904 | refill_rspq(adap, &qs->rspq, 1); |
| 2905 | qs->rspq.restarted++; |
| 2906 | t3_write_reg(adap, A_SG_RSPQ_FL_STATUS, |
| 2907 | 1 << qs->rspq.cntxt_id); |
Divy Le Ray | bae73f4 | 2007-02-24 16:44:12 -0800 | [diff] [blame] | 2908 | } |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2909 | } |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2910 | } |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 2911 | |
| 2912 | if (qs->fl[0].credits < qs->fl[0].size) |
| 2913 | __refill_fl(adap, &qs->fl[0]); |
| 2914 | if (qs->fl[1].credits < qs->fl[1].size) |
| 2915 | __refill_fl(adap, &qs->fl[1]); |
| 2916 | |
| 2917 | unlock: |
| 2918 | spin_unlock_irq(lock); |
| 2919 | out: |
| 2920 | mod_timer(&qs->rx_reclaim_timer, jiffies + RX_RECLAIM_PERIOD); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2921 | } |
| 2922 | |
| 2923 | /** |
| 2924 | * t3_update_qset_coalesce - update coalescing settings for a queue set |
| 2925 | * @qs: the SGE queue set |
| 2926 | * @p: new queue set parameters |
| 2927 | * |
| 2928 | * Update the coalescing settings for an SGE queue set. Nothing is done |
| 2929 | * if the queue set is not initialized yet. |
| 2930 | */ |
| 2931 | void t3_update_qset_coalesce(struct sge_qset *qs, const struct qset_params *p) |
| 2932 | { |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2933 | qs->rspq.holdoff_tmr = max(p->coalesce_usecs * 10, 1U);/* can't be 0 */ |
| 2934 | qs->rspq.polling = p->polling; |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 2935 | qs->napi.poll = p->polling ? napi_rx_handler : ofld_poll; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2936 | } |
| 2937 | |
| 2938 | /** |
| 2939 | * t3_sge_alloc_qset - initialize an SGE queue set |
| 2940 | * @adapter: the adapter |
| 2941 | * @id: the queue set id |
| 2942 | * @nports: how many Ethernet ports will be using this queue set |
| 2943 | * @irq_vec_idx: the IRQ vector index for response queue interrupts |
| 2944 | * @p: configuration parameters for this queue set |
| 2945 | * @ntxq: number of Tx queues for the queue set |
| 2946 | * @netdev: net device associated with this queue set |
Divy Le Ray | 82ad332 | 2008-12-16 01:09:39 -0800 | [diff] [blame] | 2947 | * @netdevq: net device TX queue associated with this queue set |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2948 | * |
| 2949 | * Allocate resources and initialize an SGE queue set. A queue set |
| 2950 | * comprises a response queue, two Rx free-buffer queues, and up to 3 |
| 2951 | * Tx queues. The Tx queues are assigned roles in the order Ethernet |
| 2952 | * queue, offload queue, and control queue. |
| 2953 | */ |
| 2954 | int t3_sge_alloc_qset(struct adapter *adapter, unsigned int id, int nports, |
| 2955 | int irq_vec_idx, const struct qset_params *p, |
Divy Le Ray | 82ad332 | 2008-12-16 01:09:39 -0800 | [diff] [blame] | 2956 | int ntxq, struct net_device *dev, |
| 2957 | struct netdev_queue *netdevq) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2958 | { |
Divy Le Ray | b1fb1f2 | 2008-05-21 18:56:16 -0700 | [diff] [blame] | 2959 | int i, avail, ret = -ENOMEM; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2960 | struct sge_qset *q = &adapter->sge.qs[id]; |
| 2961 | |
| 2962 | init_qset_cntxt(q, id); |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 2963 | setup_timer(&q->tx_reclaim_timer, sge_timer_tx, (unsigned long)q); |
| 2964 | setup_timer(&q->rx_reclaim_timer, sge_timer_rx, (unsigned long)q); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 2965 | |
| 2966 | q->fl[0].desc = alloc_ring(adapter->pdev, p->fl_size, |
| 2967 | sizeof(struct rx_desc), |
| 2968 | sizeof(struct rx_sw_desc), |
| 2969 | &q->fl[0].phys_addr, &q->fl[0].sdesc); |
| 2970 | if (!q->fl[0].desc) |
| 2971 | goto err; |
| 2972 | |
| 2973 | q->fl[1].desc = alloc_ring(adapter->pdev, p->jumbo_size, |
| 2974 | sizeof(struct rx_desc), |
| 2975 | sizeof(struct rx_sw_desc), |
| 2976 | &q->fl[1].phys_addr, &q->fl[1].sdesc); |
| 2977 | if (!q->fl[1].desc) |
| 2978 | goto err; |
| 2979 | |
| 2980 | q->rspq.desc = alloc_ring(adapter->pdev, p->rspq_size, |
| 2981 | sizeof(struct rsp_desc), 0, |
| 2982 | &q->rspq.phys_addr, NULL); |
| 2983 | if (!q->rspq.desc) |
| 2984 | goto err; |
| 2985 | |
| 2986 | for (i = 0; i < ntxq; ++i) { |
| 2987 | /* |
| 2988 | * The control queue always uses immediate data so does not |
| 2989 | * need to keep track of any sk_buffs. |
| 2990 | */ |
| 2991 | size_t sz = i == TXQ_CTRL ? 0 : sizeof(struct tx_sw_desc); |
| 2992 | |
| 2993 | q->txq[i].desc = alloc_ring(adapter->pdev, p->txq_size[i], |
| 2994 | sizeof(struct tx_desc), sz, |
| 2995 | &q->txq[i].phys_addr, |
| 2996 | &q->txq[i].sdesc); |
| 2997 | if (!q->txq[i].desc) |
| 2998 | goto err; |
| 2999 | |
| 3000 | q->txq[i].gen = 1; |
| 3001 | q->txq[i].size = p->txq_size[i]; |
| 3002 | spin_lock_init(&q->txq[i].lock); |
| 3003 | skb_queue_head_init(&q->txq[i].sendq); |
| 3004 | } |
| 3005 | |
| 3006 | tasklet_init(&q->txq[TXQ_OFLD].qresume_tsk, restart_offloadq, |
| 3007 | (unsigned long)q); |
| 3008 | tasklet_init(&q->txq[TXQ_CTRL].qresume_tsk, restart_ctrlq, |
| 3009 | (unsigned long)q); |
| 3010 | |
| 3011 | q->fl[0].gen = q->fl[1].gen = 1; |
| 3012 | q->fl[0].size = p->fl_size; |
| 3013 | q->fl[1].size = p->jumbo_size; |
| 3014 | |
| 3015 | q->rspq.gen = 1; |
| 3016 | q->rspq.size = p->rspq_size; |
| 3017 | spin_lock_init(&q->rspq.lock); |
David S. Miller | 147e70e | 2008-09-22 01:29:52 -0700 | [diff] [blame] | 3018 | skb_queue_head_init(&q->rspq.rx_queue); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3019 | |
| 3020 | q->txq[TXQ_ETH].stop_thres = nports * |
| 3021 | flits_to_desc(sgl_len(MAX_SKB_FRAGS + 1) + 3); |
| 3022 | |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 3023 | #if FL0_PG_CHUNK_SIZE > 0 |
| 3024 | q->fl[0].buf_size = FL0_PG_CHUNK_SIZE; |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 3025 | #else |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 3026 | q->fl[0].buf_size = SGE_RX_SM_BUF_SIZE + sizeof(struct cpl_rx_data); |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 3027 | #endif |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 3028 | #if FL1_PG_CHUNK_SIZE > 0 |
| 3029 | q->fl[1].buf_size = FL1_PG_CHUNK_SIZE; |
| 3030 | #else |
Divy Le Ray | cf992af | 2007-05-30 21:10:47 -0700 | [diff] [blame] | 3031 | q->fl[1].buf_size = is_offload(adapter) ? |
| 3032 | (16 * 1024) - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) : |
| 3033 | MAX_FRAME_SIZE + 2 + sizeof(struct cpl_rx_pkt); |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 3034 | #endif |
| 3035 | |
| 3036 | q->fl[0].use_pages = FL0_PG_CHUNK_SIZE > 0; |
| 3037 | q->fl[1].use_pages = FL1_PG_CHUNK_SIZE > 0; |
| 3038 | q->fl[0].order = FL0_PG_ORDER; |
| 3039 | q->fl[1].order = FL1_PG_ORDER; |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 3040 | q->fl[0].alloc_size = FL0_PG_ALLOC_SIZE; |
| 3041 | q->fl[1].alloc_size = FL1_PG_ALLOC_SIZE; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3042 | |
Roland Dreier | b1186de | 2008-03-20 13:30:48 -0700 | [diff] [blame] | 3043 | spin_lock_irq(&adapter->sge.reg_lock); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3044 | |
| 3045 | /* FL threshold comparison uses < */ |
| 3046 | ret = t3_sge_init_rspcntxt(adapter, q->rspq.cntxt_id, irq_vec_idx, |
| 3047 | q->rspq.phys_addr, q->rspq.size, |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 3048 | q->fl[0].buf_size - SGE_PG_RSVD, 1, 0); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3049 | if (ret) |
| 3050 | goto err_unlock; |
| 3051 | |
| 3052 | for (i = 0; i < SGE_RXQ_PER_SET; ++i) { |
| 3053 | ret = t3_sge_init_flcntxt(adapter, q->fl[i].cntxt_id, 0, |
| 3054 | q->fl[i].phys_addr, q->fl[i].size, |
Divy Le Ray | 5e68b77 | 2009-03-26 16:39:29 +0000 | [diff] [blame] | 3055 | q->fl[i].buf_size - SGE_PG_RSVD, |
| 3056 | p->cong_thres, 1, 0); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3057 | if (ret) |
| 3058 | goto err_unlock; |
| 3059 | } |
| 3060 | |
| 3061 | ret = t3_sge_init_ecntxt(adapter, q->txq[TXQ_ETH].cntxt_id, USE_GTS, |
| 3062 | SGE_CNTXT_ETH, id, q->txq[TXQ_ETH].phys_addr, |
| 3063 | q->txq[TXQ_ETH].size, q->txq[TXQ_ETH].token, |
| 3064 | 1, 0); |
| 3065 | if (ret) |
| 3066 | goto err_unlock; |
| 3067 | |
| 3068 | if (ntxq > 1) { |
| 3069 | ret = t3_sge_init_ecntxt(adapter, q->txq[TXQ_OFLD].cntxt_id, |
| 3070 | USE_GTS, SGE_CNTXT_OFLD, id, |
| 3071 | q->txq[TXQ_OFLD].phys_addr, |
| 3072 | q->txq[TXQ_OFLD].size, 0, 1, 0); |
| 3073 | if (ret) |
| 3074 | goto err_unlock; |
| 3075 | } |
| 3076 | |
| 3077 | if (ntxq > 2) { |
| 3078 | ret = t3_sge_init_ecntxt(adapter, q->txq[TXQ_CTRL].cntxt_id, 0, |
| 3079 | SGE_CNTXT_CTRL, id, |
| 3080 | q->txq[TXQ_CTRL].phys_addr, |
| 3081 | q->txq[TXQ_CTRL].size, |
| 3082 | q->txq[TXQ_CTRL].token, 1, 0); |
| 3083 | if (ret) |
| 3084 | goto err_unlock; |
| 3085 | } |
| 3086 | |
Roland Dreier | b1186de | 2008-03-20 13:30:48 -0700 | [diff] [blame] | 3087 | spin_unlock_irq(&adapter->sge.reg_lock); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3088 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3089 | q->adap = adapter; |
| 3090 | q->netdev = dev; |
Divy Le Ray | 82ad332 | 2008-12-16 01:09:39 -0800 | [diff] [blame] | 3091 | q->tx_q = netdevq; |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 3092 | t3_update_qset_coalesce(q, p); |
Divy Le Ray | b47385b | 2008-05-21 18:56:26 -0700 | [diff] [blame] | 3093 | |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 3094 | avail = refill_fl(adapter, &q->fl[0], q->fl[0].size, |
| 3095 | GFP_KERNEL | __GFP_COMP); |
Divy Le Ray | b1fb1f2 | 2008-05-21 18:56:16 -0700 | [diff] [blame] | 3096 | if (!avail) { |
| 3097 | CH_ALERT(adapter, "free list queue 0 initialization failed\n"); |
| 3098 | goto err; |
| 3099 | } |
| 3100 | if (avail < q->fl[0].size) |
| 3101 | CH_WARN(adapter, "free list queue 0 enabled with %d credits\n", |
| 3102 | avail); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3103 | |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 3104 | avail = refill_fl(adapter, &q->fl[1], q->fl[1].size, |
| 3105 | GFP_KERNEL | __GFP_COMP); |
Divy Le Ray | b1fb1f2 | 2008-05-21 18:56:16 -0700 | [diff] [blame] | 3106 | if (avail < q->fl[1].size) |
| 3107 | CH_WARN(adapter, "free list queue 1 enabled with %d credits\n", |
| 3108 | avail); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3109 | refill_rspq(adapter, &q->rspq, q->rspq.size - 1); |
| 3110 | |
| 3111 | t3_write_reg(adapter, A_SG_GTS, V_RSPQ(q->rspq.cntxt_id) | |
| 3112 | V_NEWTIMER(q->rspq.holdoff_tmr)); |
| 3113 | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3114 | return 0; |
| 3115 | |
Divy Le Ray | b1fb1f2 | 2008-05-21 18:56:16 -0700 | [diff] [blame] | 3116 | err_unlock: |
Roland Dreier | b1186de | 2008-03-20 13:30:48 -0700 | [diff] [blame] | 3117 | spin_unlock_irq(&adapter->sge.reg_lock); |
Divy Le Ray | b1fb1f2 | 2008-05-21 18:56:16 -0700 | [diff] [blame] | 3118 | err: |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3119 | t3_free_qset(adapter, q); |
| 3120 | return ret; |
| 3121 | } |
| 3122 | |
| 3123 | /** |
Divy Le Ray | 3156378 | 2009-03-26 16:39:09 +0000 | [diff] [blame] | 3124 | * t3_start_sge_timers - start SGE timer call backs |
| 3125 | * @adap: the adapter |
| 3126 | * |
| 3127 | * Starts each SGE queue set's timer call back |
| 3128 | */ |
| 3129 | void t3_start_sge_timers(struct adapter *adap) |
| 3130 | { |
| 3131 | int i; |
| 3132 | |
| 3133 | for (i = 0; i < SGE_QSETS; ++i) { |
| 3134 | struct sge_qset *q = &adap->sge.qs[i]; |
| 3135 | |
| 3136 | if (q->tx_reclaim_timer.function) |
| 3137 | mod_timer(&q->tx_reclaim_timer, jiffies + TX_RECLAIM_PERIOD); |
| 3138 | |
| 3139 | if (q->rx_reclaim_timer.function) |
| 3140 | mod_timer(&q->rx_reclaim_timer, jiffies + RX_RECLAIM_PERIOD); |
| 3141 | } |
| 3142 | } |
| 3143 | |
| 3144 | /** |
Divy Le Ray | 0ca41c0 | 2008-09-25 14:05:28 +0000 | [diff] [blame] | 3145 | * t3_stop_sge_timers - stop SGE timer call backs |
| 3146 | * @adap: the adapter |
| 3147 | * |
| 3148 | * Stops each SGE queue set's timer call back |
| 3149 | */ |
| 3150 | void t3_stop_sge_timers(struct adapter *adap) |
| 3151 | { |
| 3152 | int i; |
| 3153 | |
| 3154 | for (i = 0; i < SGE_QSETS; ++i) { |
| 3155 | struct sge_qset *q = &adap->sge.qs[i]; |
| 3156 | |
| 3157 | if (q->tx_reclaim_timer.function) |
| 3158 | del_timer_sync(&q->tx_reclaim_timer); |
Divy Le Ray | 42c8ea1 | 2009-03-12 21:14:04 +0000 | [diff] [blame] | 3159 | if (q->rx_reclaim_timer.function) |
| 3160 | del_timer_sync(&q->rx_reclaim_timer); |
Divy Le Ray | 0ca41c0 | 2008-09-25 14:05:28 +0000 | [diff] [blame] | 3161 | } |
| 3162 | } |
| 3163 | |
| 3164 | /** |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3165 | * t3_free_sge_resources - free SGE resources |
| 3166 | * @adap: the adapter |
| 3167 | * |
| 3168 | * Frees resources used by the SGE queue sets. |
| 3169 | */ |
| 3170 | void t3_free_sge_resources(struct adapter *adap) |
| 3171 | { |
| 3172 | int i; |
| 3173 | |
| 3174 | for (i = 0; i < SGE_QSETS; ++i) |
| 3175 | t3_free_qset(adap, &adap->sge.qs[i]); |
| 3176 | } |
| 3177 | |
| 3178 | /** |
| 3179 | * t3_sge_start - enable SGE |
| 3180 | * @adap: the adapter |
| 3181 | * |
| 3182 | * Enables the SGE for DMAs. This is the last step in starting packet |
| 3183 | * transfers. |
| 3184 | */ |
| 3185 | void t3_sge_start(struct adapter *adap) |
| 3186 | { |
| 3187 | t3_set_reg_field(adap, A_SG_CONTROL, F_GLOBALENABLE, F_GLOBALENABLE); |
| 3188 | } |
| 3189 | |
| 3190 | /** |
| 3191 | * t3_sge_stop - disable SGE operation |
| 3192 | * @adap: the adapter |
| 3193 | * |
| 3194 | * Disables the DMA engine. This can be called in emeregencies (e.g., |
| 3195 | * from error interrupts) or from normal process context. In the latter |
| 3196 | * case it also disables any pending queue restart tasklets. Note that |
| 3197 | * if it is called in interrupt context it cannot disable the restart |
| 3198 | * tasklets as it cannot wait, however the tasklets will have no effect |
| 3199 | * since the doorbells are disabled and the driver will call this again |
| 3200 | * later from process context, at which time the tasklets will be stopped |
| 3201 | * if they are still running. |
| 3202 | */ |
| 3203 | void t3_sge_stop(struct adapter *adap) |
| 3204 | { |
| 3205 | t3_set_reg_field(adap, A_SG_CONTROL, F_GLOBALENABLE, 0); |
| 3206 | if (!in_interrupt()) { |
| 3207 | int i; |
| 3208 | |
| 3209 | for (i = 0; i < SGE_QSETS; ++i) { |
| 3210 | struct sge_qset *qs = &adap->sge.qs[i]; |
| 3211 | |
| 3212 | tasklet_kill(&qs->txq[TXQ_OFLD].qresume_tsk); |
| 3213 | tasklet_kill(&qs->txq[TXQ_CTRL].qresume_tsk); |
| 3214 | } |
| 3215 | } |
| 3216 | } |
| 3217 | |
| 3218 | /** |
| 3219 | * t3_sge_init - initialize SGE |
| 3220 | * @adap: the adapter |
| 3221 | * @p: the SGE parameters |
| 3222 | * |
| 3223 | * Performs SGE initialization needed every time after a chip reset. |
| 3224 | * We do not initialize any of the queue sets here, instead the driver |
| 3225 | * top-level must request those individually. We also do not enable DMA |
| 3226 | * here, that should be done after the queues have been set up. |
| 3227 | */ |
| 3228 | void t3_sge_init(struct adapter *adap, struct sge_params *p) |
| 3229 | { |
| 3230 | unsigned int ctrl, ups = ffs(pci_resource_len(adap->pdev, 2) >> 12); |
| 3231 | |
| 3232 | ctrl = F_DROPPKT | V_PKTSHIFT(2) | F_FLMODE | F_AVOIDCQOVFL | |
Divy Le Ray | b881955 | 2007-12-17 18:47:31 -0800 | [diff] [blame] | 3233 | F_CQCRDTCTRL | F_CONGMODE | F_TNLFLMODE | F_FATLPERREN | |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3234 | V_HOSTPAGESIZE(PAGE_SHIFT - 11) | F_BIGENDIANINGRESS | |
| 3235 | V_USERSPACESIZE(ups ? ups - 1 : 0) | F_ISCSICOALESCING; |
| 3236 | #if SGE_NUM_GENBITS == 1 |
| 3237 | ctrl |= F_EGRGENCTRL; |
| 3238 | #endif |
| 3239 | if (adap->params.rev > 0) { |
| 3240 | if (!(adap->flags & (USING_MSIX | USING_MSI))) |
| 3241 | ctrl |= F_ONEINTMULTQ | F_OPTONEINTMULTQ; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3242 | } |
| 3243 | t3_write_reg(adap, A_SG_CONTROL, ctrl); |
| 3244 | t3_write_reg(adap, A_SG_EGR_RCQ_DRB_THRSH, V_HIRCQDRBTHRSH(512) | |
| 3245 | V_LORCQDRBTHRSH(512)); |
| 3246 | t3_write_reg(adap, A_SG_TIMER_TICK, core_ticks_per_usec(adap) / 10); |
| 3247 | t3_write_reg(adap, A_SG_CMDQ_CREDIT_TH, V_THRESHOLD(32) | |
Divy Le Ray | 6195c71 | 2007-01-30 19:43:56 -0800 | [diff] [blame] | 3248 | V_TIMEOUT(200 * core_ticks_per_usec(adap))); |
Divy Le Ray | b881955 | 2007-12-17 18:47:31 -0800 | [diff] [blame] | 3249 | t3_write_reg(adap, A_SG_HI_DRB_HI_THRSH, |
| 3250 | adap->params.rev < T3_REV_C ? 1000 : 500); |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3251 | t3_write_reg(adap, A_SG_HI_DRB_LO_THRSH, 256); |
| 3252 | t3_write_reg(adap, A_SG_LO_DRB_HI_THRSH, 1000); |
| 3253 | t3_write_reg(adap, A_SG_LO_DRB_LO_THRSH, 256); |
| 3254 | t3_write_reg(adap, A_SG_OCO_BASE, V_BASE1(0xfff)); |
| 3255 | t3_write_reg(adap, A_SG_DRB_PRI_THRESH, 63 * 1024); |
| 3256 | } |
| 3257 | |
| 3258 | /** |
| 3259 | * t3_sge_prep - one-time SGE initialization |
| 3260 | * @adap: the associated adapter |
| 3261 | * @p: SGE parameters |
| 3262 | * |
| 3263 | * Performs one-time initialization of SGE SW state. Includes determining |
| 3264 | * defaults for the assorted SGE parameters, which admins can change until |
| 3265 | * they are used to initialize the SGE. |
| 3266 | */ |
Roland Dreier | 7b9b094 | 2008-01-29 14:45:11 -0800 | [diff] [blame] | 3267 | void t3_sge_prep(struct adapter *adap, struct sge_params *p) |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3268 | { |
| 3269 | int i; |
| 3270 | |
| 3271 | p->max_pkt_size = (16 * 1024) - sizeof(struct cpl_rx_data) - |
| 3272 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
| 3273 | |
| 3274 | for (i = 0; i < SGE_QSETS; ++i) { |
| 3275 | struct qset_params *q = p->qset + i; |
| 3276 | |
| 3277 | q->polling = adap->params.rev > 0; |
| 3278 | q->coalesce_usecs = 5; |
| 3279 | q->rspq_size = 1024; |
Divy Le Ray | e0994eb | 2007-02-24 16:44:17 -0800 | [diff] [blame] | 3280 | q->fl_size = 1024; |
Divy Le Ray | 7385ecf | 2008-05-21 18:56:21 -0700 | [diff] [blame] | 3281 | q->jumbo_size = 512; |
Divy Le Ray | 4d22de3 | 2007-01-18 22:04:14 -0500 | [diff] [blame] | 3282 | q->txq_size[TXQ_ETH] = 1024; |
| 3283 | q->txq_size[TXQ_OFLD] = 1024; |
| 3284 | q->txq_size[TXQ_CTRL] = 256; |
| 3285 | q->cong_thres = 0; |
| 3286 | } |
| 3287 | |
| 3288 | spin_lock_init(&adap->sge.reg_lock); |
| 3289 | } |
| 3290 | |
| 3291 | /** |
| 3292 | * t3_get_desc - dump an SGE descriptor for debugging purposes |
| 3293 | * @qs: the queue set |
| 3294 | * @qnum: identifies the specific queue (0..2: Tx, 3:response, 4..5: Rx) |
| 3295 | * @idx: the descriptor index in the queue |
| 3296 | * @data: where to dump the descriptor contents |
| 3297 | * |
| 3298 | * Dumps the contents of a HW descriptor of an SGE queue. Returns the |
| 3299 | * size of the descriptor. |
| 3300 | */ |
| 3301 | int t3_get_desc(const struct sge_qset *qs, unsigned int qnum, unsigned int idx, |
| 3302 | unsigned char *data) |
| 3303 | { |
| 3304 | if (qnum >= 6) |
| 3305 | return -EINVAL; |
| 3306 | |
| 3307 | if (qnum < 3) { |
| 3308 | if (!qs->txq[qnum].desc || idx >= qs->txq[qnum].size) |
| 3309 | return -EINVAL; |
| 3310 | memcpy(data, &qs->txq[qnum].desc[idx], sizeof(struct tx_desc)); |
| 3311 | return sizeof(struct tx_desc); |
| 3312 | } |
| 3313 | |
| 3314 | if (qnum == 3) { |
| 3315 | if (!qs->rspq.desc || idx >= qs->rspq.size) |
| 3316 | return -EINVAL; |
| 3317 | memcpy(data, &qs->rspq.desc[idx], sizeof(struct rsp_desc)); |
| 3318 | return sizeof(struct rsp_desc); |
| 3319 | } |
| 3320 | |
| 3321 | qnum -= 4; |
| 3322 | if (!qs->fl[qnum].desc || idx >= qs->fl[qnum].size) |
| 3323 | return -EINVAL; |
| 3324 | memcpy(data, &qs->fl[qnum].desc[idx], sizeof(struct rx_desc)); |
| 3325 | return sizeof(struct rx_desc); |
| 3326 | } |