blob: 854772dd52fd18b7e5fa8073844b62ed7994c91d [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Ursula Brauna4cf0442017-01-09 16:55:14 +01002/*
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
4 *
5 * IB infrastructure:
6 * Establish SMC-R as an Infiniband Client to be notified about added and
7 * removed IB devices of type RDMA.
8 * Determine device and port characteristics for these IB devices.
9 *
10 * Copyright IBM Corp. 2016
11 *
12 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
13 */
14
Jakub Kicinskib6459412021-12-28 16:49:13 -080015#include <linux/etherdevice.h>
16#include <linux/if_vlan.h>
Ursula Brauna4cf0442017-01-09 16:55:14 +010017#include <linux/random.h>
Ursula Braunbd4ad572017-01-09 16:55:20 +010018#include <linux/workqueue.h>
Ursula Braun10428dd2017-07-28 13:56:22 +020019#include <linux/scatterlist.h>
Ursula Braun6dabd402019-11-16 17:47:29 +010020#include <linux/wait.h>
Ursula Braun92f3cb02020-07-08 17:05:13 +020021#include <linux/mutex.h>
Karsten Graul24fb6812021-10-16 11:37:48 +020022#include <linux/inetdevice.h>
Ursula Brauna4cf0442017-01-09 16:55:14 +010023#include <rdma/ib_verbs.h>
Parav Panditddb457c2018-06-05 08:40:19 +030024#include <rdma/ib_cache.h>
Ursula Brauna4cf0442017-01-09 16:55:14 +010025
Thomas Richter6812baa2017-01-09 16:55:15 +010026#include "smc_pnet.h"
Ursula Brauna4cf0442017-01-09 16:55:14 +010027#include "smc_ib.h"
Ursula Brauncd6851f2017-01-09 16:55:18 +010028#include "smc_core.h"
Ursula Braunf38ba1792017-01-09 16:55:19 +010029#include "smc_wr.h"
Ursula Brauna4cf0442017-01-09 16:55:14 +010030#include "smc.h"
Guvenc Gulcea3db10e2020-12-01 20:20:49 +010031#include "smc_netlink.h"
Ursula Brauna4cf0442017-01-09 16:55:14 +010032
Ursula Braunc9f4c6c2018-03-14 11:01:00 +010033#define SMC_MAX_CQE 32766 /* max. # of completion queue elements */
34
Ursula Braunbd4ad572017-01-09 16:55:20 +010035#define SMC_QP_MIN_RNR_TIMER 5
36#define SMC_QP_TIMEOUT 15 /* 4096 * 2 ** timeout usec */
37#define SMC_QP_RETRY_CNT 7 /* 7: infinite */
38#define SMC_QP_RNR_RETRY 7 /* 7: infinite */
39
Ursula Brauna4cf0442017-01-09 16:55:14 +010040struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */
Ursula Braun92f3cb02020-07-08 17:05:13 +020041 .mutex = __MUTEX_INITIALIZER(smc_ib_devices.mutex),
Ursula Brauna4cf0442017-01-09 16:55:14 +010042 .list = LIST_HEAD_INIT(smc_ib_devices.list),
43};
44
Hans Wippel366bb242020-02-25 22:41:21 +010045u8 local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */
Ursula Brauna4cf0442017-01-09 16:55:14 +010046
Ursula Braunbd4ad572017-01-09 16:55:20 +010047static int smc_ib_modify_qp_init(struct smc_link *lnk)
48{
49 struct ib_qp_attr qp_attr;
50
51 memset(&qp_attr, 0, sizeof(qp_attr));
52 qp_attr.qp_state = IB_QPS_INIT;
53 qp_attr.pkey_index = 0;
54 qp_attr.port_num = lnk->ibport;
55 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE
56 | IB_ACCESS_REMOTE_WRITE;
57 return ib_modify_qp(lnk->roce_qp, &qp_attr,
58 IB_QP_STATE | IB_QP_PKEY_INDEX |
59 IB_QP_ACCESS_FLAGS | IB_QP_PORT);
60}
61
62static int smc_ib_modify_qp_rtr(struct smc_link *lnk)
63{
64 enum ib_qp_attr_mask qp_attr_mask =
65 IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN |
66 IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER;
67 struct ib_qp_attr qp_attr;
Karsten Graul24fb6812021-10-16 11:37:48 +020068 u8 hop_lim = 1;
Ursula Braunbd4ad572017-01-09 16:55:20 +010069
70 memset(&qp_attr, 0, sizeof(qp_attr));
71 qp_attr.qp_state = IB_QPS_RTR;
72 qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu);
Dasaratharaman Chandramouli44c58482017-04-29 14:41:29 -040073 qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE;
Dasaratharaman Chandramoulid8966fc2017-04-29 14:41:28 -040074 rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport);
Karsten Graul24fb6812021-10-16 11:37:48 +020075 if (lnk->lgr->smc_version == SMC_V2 && lnk->lgr->uses_gateway)
76 hop_lim = IPV6_DEFAULT_HOPLIMIT;
77 rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, lnk->sgid_index, hop_lim, 0);
Dasaratharaman Chandramoulid8966fc2017-04-29 14:41:28 -040078 rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid);
Karsten Graul24fb6812021-10-16 11:37:48 +020079 if (lnk->lgr->smc_version == SMC_V2 && lnk->lgr->uses_gateway)
80 memcpy(&qp_attr.ah_attr.roce.dmac, lnk->lgr->nexthop_mac,
81 sizeof(lnk->lgr->nexthop_mac));
82 else
83 memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac,
84 sizeof(lnk->peer_mac));
Ursula Braunbd4ad572017-01-09 16:55:20 +010085 qp_attr.dest_qp_num = lnk->peer_qpn;
86 qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */
87 qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming
88 * requests
89 */
90 qp_attr.min_rnr_timer = SMC_QP_MIN_RNR_TIMER;
91
92 return ib_modify_qp(lnk->roce_qp, &qp_attr, qp_attr_mask);
93}
94
95int smc_ib_modify_qp_rts(struct smc_link *lnk)
96{
97 struct ib_qp_attr qp_attr;
98
99 memset(&qp_attr, 0, sizeof(qp_attr));
100 qp_attr.qp_state = IB_QPS_RTS;
101 qp_attr.timeout = SMC_QP_TIMEOUT; /* local ack timeout */
102 qp_attr.retry_cnt = SMC_QP_RETRY_CNT; /* retry count */
103 qp_attr.rnr_retry = SMC_QP_RNR_RETRY; /* RNR retries, 7=infinite */
104 qp_attr.sq_psn = lnk->psn_initial; /* starting send packet seq # */
105 qp_attr.max_rd_atomic = 1; /* # of outstanding RDMA reads and
106 * atomic ops allowed
107 */
108 return ib_modify_qp(lnk->roce_qp, &qp_attr,
109 IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
110 IB_QP_SQ_PSN | IB_QP_RNR_RETRY |
111 IB_QP_MAX_QP_RD_ATOMIC);
112}
113
Dust Li349d4312021-12-28 17:03:25 +0800114int smc_ib_modify_qp_error(struct smc_link *lnk)
Ursula Braunbd4ad572017-01-09 16:55:20 +0100115{
116 struct ib_qp_attr qp_attr;
117
118 memset(&qp_attr, 0, sizeof(qp_attr));
Dust Li349d4312021-12-28 17:03:25 +0800119 qp_attr.qp_state = IB_QPS_ERR;
Ursula Braunbd4ad572017-01-09 16:55:20 +0100120 return ib_modify_qp(lnk->roce_qp, &qp_attr, IB_QP_STATE);
121}
122
123int smc_ib_ready_link(struct smc_link *lnk)
124{
Stefan Raspl00e5fb22018-07-23 13:53:10 +0200125 struct smc_link_group *lgr = smc_get_lgr(lnk);
Ursula Braunbd4ad572017-01-09 16:55:20 +0100126 int rc = 0;
127
128 rc = smc_ib_modify_qp_init(lnk);
129 if (rc)
130 goto out;
131
132 rc = smc_ib_modify_qp_rtr(lnk);
133 if (rc)
134 goto out;
135 smc_wr_remember_qp_attr(lnk);
136 rc = ib_req_notify_cq(lnk->smcibdev->roce_cq_recv,
137 IB_CQ_SOLICITED_MASK);
138 if (rc)
139 goto out;
140 rc = smc_wr_rx_post_init(lnk);
141 if (rc)
142 goto out;
143 smc_wr_remember_qp_attr(lnk);
144
145 if (lgr->role == SMC_SERV) {
146 rc = smc_ib_modify_qp_rts(lnk);
147 if (rc)
148 goto out;
149 smc_wr_remember_qp_attr(lnk);
150 }
151out:
152 return rc;
153}
154
Ursula Braun7005ada2018-07-25 16:35:31 +0200155static int smc_ib_fill_mac(struct smc_ib_device *smcibdev, u8 ibport)
Ursula Braunbe6a3f32018-06-28 19:05:04 +0200156{
Jason Gunthorpeb4c296f2018-08-17 16:45:51 -0600157 const struct ib_gid_attr *attr;
Parav Pandit5102eca2019-05-02 10:48:06 +0300158 int rc;
Ursula Braunbe6a3f32018-06-28 19:05:04 +0200159
Jason Gunthorpeb4c296f2018-08-17 16:45:51 -0600160 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, 0);
161 if (IS_ERR(attr))
Ursula Braunbe6a3f32018-06-28 19:05:04 +0200162 return -ENODEV;
163
Parav Pandit5102eca2019-05-02 10:48:06 +0300164 rc = rdma_read_gid_l2_fields(attr, NULL, smcibdev->mac[ibport - 1]);
Jason Gunthorpeb4c296f2018-08-17 16:45:51 -0600165 rdma_put_gid_attr(attr);
166 return rc;
Ursula Braunbe6a3f32018-06-28 19:05:04 +0200167}
168
169/* Create an identifier unique for this instance of SMC-R.
170 * The MAC-address of the first active registered IB device
171 * plus a random 2-byte number is used to create this identifier.
172 * This name is delivered to the peer during connection initialization.
173 */
174static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev,
175 u8 ibport)
176{
177 memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1],
178 sizeof(smcibdev->mac[ibport - 1]));
Hans Wippel366bb242020-02-25 22:41:21 +0100179}
180
Hans Wippela082ec82020-02-25 22:41:22 +0100181bool smc_ib_is_valid_local_systemid(void)
Hans Wippel366bb242020-02-25 22:41:21 +0100182{
183 return !is_zero_ether_addr(&local_systemid[2]);
184}
185
186static void smc_ib_init_local_systemid(void)
187{
Ursula Braunbe6a3f32018-06-28 19:05:04 +0200188 get_random_bytes(&local_systemid[0], 2);
189}
190
191bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport)
192{
193 return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE;
194}
195
Karsten Graule5c47442021-10-16 11:37:45 +0200196int smc_ib_find_route(__be32 saddr, __be32 daddr,
197 u8 nexthop_mac[], u8 *uses_gateway)
198{
199 struct neighbour *neigh = NULL;
200 struct rtable *rt = NULL;
201 struct flowi4 fl4 = {
202 .saddr = saddr,
203 .daddr = daddr
204 };
205
206 if (daddr == cpu_to_be32(INADDR_NONE))
207 goto out;
208 rt = ip_route_output_flow(&init_net, &fl4, NULL);
209 if (IS_ERR(rt))
210 goto out;
211 if (rt->rt_uses_gateway && rt->rt_gw_family != AF_INET)
212 goto out;
213 neigh = rt->dst.ops->neigh_lookup(&rt->dst, NULL, &fl4.daddr);
214 if (neigh) {
215 memcpy(nexthop_mac, neigh->ha, ETH_ALEN);
216 *uses_gateway = rt->rt_uses_gateway;
217 return 0;
218 }
219out:
220 return -ENOENT;
221}
222
Karsten Graul24fb6812021-10-16 11:37:48 +0200223static int smc_ib_determine_gid_rcu(const struct net_device *ndev,
224 const struct ib_gid_attr *attr,
225 u8 gid[], u8 *sgid_index,
226 struct smc_init_info_smcrv2 *smcrv2)
227{
228 if (!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) {
229 if (gid)
230 memcpy(gid, &attr->gid, SMC_GID_SIZE);
231 if (sgid_index)
232 *sgid_index = attr->index;
233 return 0;
234 }
235 if (smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
236 smc_ib_gid_to_ipv4((u8 *)&attr->gid) != cpu_to_be32(INADDR_NONE)) {
237 struct in_device *in_dev = __in_dev_get_rcu(ndev);
238 const struct in_ifaddr *ifa;
239 bool subnet_match = false;
240
241 if (!in_dev)
242 goto out;
243 in_dev_for_each_ifa_rcu(ifa, in_dev) {
244 if (!inet_ifa_match(smcrv2->saddr, ifa))
245 continue;
246 subnet_match = true;
247 break;
248 }
249 if (!subnet_match)
250 goto out;
251 if (smcrv2->daddr && smc_ib_find_route(smcrv2->saddr,
252 smcrv2->daddr,
253 smcrv2->nexthop_mac,
254 &smcrv2->uses_gateway))
255 goto out;
256
257 if (gid)
258 memcpy(gid, &attr->gid, SMC_GID_SIZE);
259 if (sgid_index)
260 *sgid_index = attr->index;
261 return 0;
262 }
263out:
264 return -ENODEV;
265}
266
Ursula Braun7005ada2018-07-25 16:35:31 +0200267/* determine the gid for an ib-device port and vlan id */
268int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
Karsten Graul24fb6812021-10-16 11:37:48 +0200269 unsigned short vlan_id, u8 gid[], u8 *sgid_index,
270 struct smc_init_info_smcrv2 *smcrv2)
Ursula Braun7005ada2018-07-25 16:35:31 +0200271{
Jason Gunthorpeb4c296f2018-08-17 16:45:51 -0600272 const struct ib_gid_attr *attr;
Parav Pandit5102eca2019-05-02 10:48:06 +0300273 const struct net_device *ndev;
Ursula Braun7005ada2018-07-25 16:35:31 +0200274 int i;
275
276 for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
Jason Gunthorpeb4c296f2018-08-17 16:45:51 -0600277 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
278 if (IS_ERR(attr))
Ursula Braun7005ada2018-07-25 16:35:31 +0200279 continue;
Jason Gunthorpeb4c296f2018-08-17 16:45:51 -0600280
Parav Pandit5102eca2019-05-02 10:48:06 +0300281 rcu_read_lock();
282 ndev = rdma_read_gid_attr_ndev_rcu(attr);
283 if (!IS_ERR(ndev) &&
Karsten Graul41a0be32020-11-18 22:40:38 +0100284 ((!vlan_id && !is_vlan_dev(ndev)) ||
285 (vlan_id && is_vlan_dev(ndev) &&
Karsten Graul24fb6812021-10-16 11:37:48 +0200286 vlan_dev_vlan_id(ndev) == vlan_id))) {
287 if (!smc_ib_determine_gid_rcu(ndev, attr, gid,
288 sgid_index, smcrv2)) {
289 rcu_read_unlock();
290 rdma_put_gid_attr(attr);
291 return 0;
292 }
Ursula Braun7005ada2018-07-25 16:35:31 +0200293 }
Parav Pandit5102eca2019-05-02 10:48:06 +0300294 rcu_read_unlock();
Jason Gunthorpeb4c296f2018-08-17 16:45:51 -0600295 rdma_put_gid_attr(attr);
Ursula Braun7005ada2018-07-25 16:35:31 +0200296 }
297 return -ENODEV;
298}
299
Karsten Graul29397e32021-10-16 11:37:52 +0200300/* check if gid is still defined on smcibdev */
301static bool smc_ib_check_link_gid(u8 gid[SMC_GID_SIZE], bool smcrv2,
302 struct smc_ib_device *smcibdev, u8 ibport)
303{
304 const struct ib_gid_attr *attr;
305 bool rc = false;
306 int i;
307
308 for (i = 0; !rc && i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
309 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
310 if (IS_ERR(attr))
311 continue;
312
313 rcu_read_lock();
314 if ((!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) ||
315 (smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
316 !(ipv6_addr_type((const struct in6_addr *)&attr->gid)
317 & IPV6_ADDR_LINKLOCAL)))
318 if (!memcmp(gid, &attr->gid, SMC_GID_SIZE))
319 rc = true;
320 rcu_read_unlock();
321 rdma_put_gid_attr(attr);
322 }
323 return rc;
324}
325
326/* check all links if the gid is still defined on smcibdev */
327static void smc_ib_gid_check(struct smc_ib_device *smcibdev, u8 ibport)
328{
329 struct smc_link_group *lgr;
330 int i;
331
332 spin_lock_bh(&smc_lgr_list.lock);
333 list_for_each_entry(lgr, &smc_lgr_list.list, list) {
334 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
335 SMC_MAX_PNETID_LEN))
336 continue; /* lgr is not affected */
337 if (list_empty(&lgr->list))
338 continue;
339 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
340 if (lgr->lnk[i].state == SMC_LNK_UNUSED ||
341 lgr->lnk[i].smcibdev != smcibdev)
342 continue;
343 if (!smc_ib_check_link_gid(lgr->lnk[i].gid,
344 lgr->smc_version == SMC_V2,
345 smcibdev, ibport))
346 smcr_port_err(smcibdev, ibport);
347 }
348 }
349 spin_unlock_bh(&smc_lgr_list.lock);
350}
351
Ursula Braunbe6a3f32018-06-28 19:05:04 +0200352static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport)
353{
354 int rc;
355
356 memset(&smcibdev->pattr[ibport - 1], 0,
357 sizeof(smcibdev->pattr[ibport - 1]));
358 rc = ib_query_port(smcibdev->ibdev, ibport,
359 &smcibdev->pattr[ibport - 1]);
360 if (rc)
361 goto out;
362 /* the SMC protocol requires specification of the RoCE MAC address */
Ursula Braun7005ada2018-07-25 16:35:31 +0200363 rc = smc_ib_fill_mac(smcibdev, ibport);
Ursula Braunbe6a3f32018-06-28 19:05:04 +0200364 if (rc)
365 goto out;
Hans Wippel366bb242020-02-25 22:41:21 +0100366 if (!smc_ib_is_valid_local_systemid() &&
Ursula Braunbe6a3f32018-06-28 19:05:04 +0200367 smc_ib_port_active(smcibdev, ibport))
368 /* create unique system identifier */
369 smc_ib_define_local_systemid(smcibdev, ibport);
370out:
371 return rc;
372}
373
Ursula Braunbd4ad572017-01-09 16:55:20 +0100374/* process context wrapper for might_sleep smc_ib_remember_port_attr */
375static void smc_ib_port_event_work(struct work_struct *work)
376{
377 struct smc_ib_device *smcibdev = container_of(
378 work, struct smc_ib_device, port_event_work);
379 u8 port_idx;
380
381 for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) {
382 smc_ib_remember_port_attr(smcibdev, port_idx + 1);
383 clear_bit(port_idx, &smcibdev->port_event_mask);
Ursula Braunc3d94942019-10-09 10:07:46 +0200384 if (!smc_ib_port_active(smcibdev, port_idx + 1)) {
385 set_bit(port_idx, smcibdev->ports_going_away);
Karsten Graul541afa12020-05-01 12:48:08 +0200386 smcr_port_err(smcibdev, port_idx + 1);
Ursula Braunc3d94942019-10-09 10:07:46 +0200387 } else {
388 clear_bit(port_idx, smcibdev->ports_going_away);
Karsten Graul1f90a052020-05-01 12:48:07 +0200389 smcr_port_add(smcibdev, port_idx + 1);
Karsten Graul29397e32021-10-16 11:37:52 +0200390 smc_ib_gid_check(smcibdev, port_idx + 1);
Ursula Braunc3d94942019-10-09 10:07:46 +0200391 }
Ursula Braunbd4ad572017-01-09 16:55:20 +0100392 }
393}
394
395/* can be called in IRQ context */
396static void smc_ib_global_event_handler(struct ib_event_handler *handler,
397 struct ib_event *ibevent)
398{
399 struct smc_ib_device *smcibdev;
Ursula Braun5613f202020-02-17 16:24:55 +0100400 bool schedule = false;
Ursula Braunbd4ad572017-01-09 16:55:20 +0100401 u8 port_idx;
402
403 smcibdev = container_of(handler, struct smc_ib_device, event_handler);
Ursula Braunbd4ad572017-01-09 16:55:20 +0100404
405 switch (ibevent->event) {
Ursula Braunbd4ad572017-01-09 16:55:20 +0100406 case IB_EVENT_DEVICE_FATAL:
Karsten Graul81cf6432019-02-12 16:29:55 +0100407 /* terminate all ports on device */
Ursula Braunc3d94942019-10-09 10:07:46 +0200408 for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) {
Karsten Graul81cf6432019-02-12 16:29:55 +0100409 set_bit(port_idx, &smcibdev->port_event_mask);
Ursula Braun5613f202020-02-17 16:24:55 +0100410 if (!test_and_set_bit(port_idx,
411 smcibdev->ports_going_away))
412 schedule = true;
Ursula Braunc3d94942019-10-09 10:07:46 +0200413 }
Ursula Braun5613f202020-02-17 16:24:55 +0100414 if (schedule)
415 schedule_work(&smcibdev->port_event_work);
416 break;
417 case IB_EVENT_PORT_ACTIVE:
418 port_idx = ibevent->element.port_num - 1;
419 if (port_idx >= SMC_MAX_PORTS)
420 break;
421 set_bit(port_idx, &smcibdev->port_event_mask);
422 if (test_and_clear_bit(port_idx, smcibdev->ports_going_away))
423 schedule_work(&smcibdev->port_event_work);
Ursula Braunbd4ad572017-01-09 16:55:20 +0100424 break;
Karsten Graul81cf6432019-02-12 16:29:55 +0100425 case IB_EVENT_PORT_ERR:
Ursula Braun5613f202020-02-17 16:24:55 +0100426 port_idx = ibevent->element.port_num - 1;
427 if (port_idx >= SMC_MAX_PORTS)
428 break;
429 set_bit(port_idx, &smcibdev->port_event_mask);
430 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
431 schedule_work(&smcibdev->port_event_work);
432 break;
Karsten Graul81cf6432019-02-12 16:29:55 +0100433 case IB_EVENT_GID_CHANGE:
434 port_idx = ibevent->element.port_num - 1;
Ursula Braun5613f202020-02-17 16:24:55 +0100435 if (port_idx >= SMC_MAX_PORTS)
436 break;
437 set_bit(port_idx, &smcibdev->port_event_mask);
438 schedule_work(&smcibdev->port_event_work);
Karsten Graul81cf6432019-02-12 16:29:55 +0100439 break;
Ursula Braunbd4ad572017-01-09 16:55:20 +0100440 default:
441 break;
442 }
443}
444
Ursula Braunf38ba1792017-01-09 16:55:19 +0100445void smc_ib_dealloc_protection_domain(struct smc_link *lnk)
446{
Ursula Braunda05bf22018-01-26 09:28:46 +0100447 if (lnk->roce_pd)
448 ib_dealloc_pd(lnk->roce_pd);
Ursula Braunf38ba1792017-01-09 16:55:19 +0100449 lnk->roce_pd = NULL;
450}
451
452int smc_ib_create_protection_domain(struct smc_link *lnk)
453{
454 int rc;
455
Ursula Braun897e1c22017-07-28 13:56:16 +0200456 lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0);
Ursula Braunf38ba1792017-01-09 16:55:19 +0100457 rc = PTR_ERR_OR_ZERO(lnk->roce_pd);
458 if (IS_ERR(lnk->roce_pd))
459 lnk->roce_pd = NULL;
460 return rc;
461}
462
Guvenc Gulcea3db10e2020-12-01 20:20:49 +0100463static bool smcr_diag_is_dev_critical(struct smc_lgr_list *smc_lgr,
464 struct smc_ib_device *smcibdev)
465{
466 struct smc_link_group *lgr;
467 bool rc = false;
468 int i;
469
470 spin_lock_bh(&smc_lgr->lock);
471 list_for_each_entry(lgr, &smc_lgr->list, list) {
472 if (lgr->is_smcd)
473 continue;
474 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
475 if (lgr->lnk[i].state == SMC_LNK_UNUSED ||
476 lgr->lnk[i].smcibdev != smcibdev)
477 continue;
478 if (lgr->type == SMC_LGR_SINGLE ||
479 lgr->type == SMC_LGR_ASYMMETRIC_LOCAL) {
480 rc = true;
481 goto out;
482 }
483 }
484 }
485out:
486 spin_unlock_bh(&smc_lgr->lock);
487 return rc;
488}
489
490static int smc_nl_handle_dev_port(struct sk_buff *skb,
491 struct ib_device *ibdev,
492 struct smc_ib_device *smcibdev,
493 int port)
494{
495 char smc_pnet[SMC_MAX_PNETID_LEN + 1];
496 struct nlattr *port_attrs;
497 unsigned char port_state;
498 int lnk_count = 0;
499
500 port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT + port);
501 if (!port_attrs)
502 goto errout;
503
504 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR,
505 smcibdev->pnetid_by_user[port]))
506 goto errattr;
Guvenc Gulce8a446532021-01-12 17:21:22 +0100507 memcpy(smc_pnet, &smcibdev->pnetid[port], SMC_MAX_PNETID_LEN);
508 smc_pnet[SMC_MAX_PNETID_LEN] = 0;
Guvenc Gulcea3db10e2020-12-01 20:20:49 +0100509 if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet))
510 goto errattr;
511 if (nla_put_u32(skb, SMC_NLA_DEV_PORT_NETDEV,
512 smcibdev->ndev_ifidx[port]))
513 goto errattr;
514 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_VALID, 1))
515 goto errattr;
516 port_state = smc_ib_port_active(smcibdev, port + 1);
517 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_STATE, port_state))
518 goto errattr;
519 lnk_count = atomic_read(&smcibdev->lnk_cnt_by_port[port]);
520 if (nla_put_u32(skb, SMC_NLA_DEV_PORT_LNK_CNT, lnk_count))
521 goto errattr;
522 nla_nest_end(skb, port_attrs);
523 return 0;
524errattr:
525 nla_nest_cancel(skb, port_attrs);
526errout:
527 return -EMSGSIZE;
528}
529
Karsten Graul995433b2020-12-15 10:10:58 +0100530static bool smc_nl_handle_pci_values(const struct smc_pci_dev *smc_pci_dev,
531 struct sk_buff *skb)
532{
533 if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev->pci_fid))
534 return false;
535 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev->pci_pchid))
536 return false;
537 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev->pci_vendor))
538 return false;
539 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev->pci_device))
540 return false;
541 if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev->pci_id))
542 return false;
543 return true;
544}
545
Guvenc Gulcea3db10e2020-12-01 20:20:49 +0100546static int smc_nl_handle_smcr_dev(struct smc_ib_device *smcibdev,
547 struct sk_buff *skb,
548 struct netlink_callback *cb)
549{
Guvenc Gulce8a446532021-01-12 17:21:22 +0100550 char smc_ibname[IB_DEVICE_NAME_MAX];
Guvenc Gulcea3db10e2020-12-01 20:20:49 +0100551 struct smc_pci_dev smc_pci_dev;
552 struct pci_dev *pci_dev;
553 unsigned char is_crit;
554 struct nlattr *attrs;
555 void *nlh;
556 int i;
557
558 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
559 &smc_gen_nl_family, NLM_F_MULTI,
560 SMC_NETLINK_GET_DEV_SMCR);
561 if (!nlh)
562 goto errmsg;
563 attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCR);
564 if (!attrs)
565 goto errout;
566 is_crit = smcr_diag_is_dev_critical(&smc_lgr_list, smcibdev);
567 if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, is_crit))
568 goto errattr;
Karsten Graul995433b2020-12-15 10:10:58 +0100569 if (smcibdev->ibdev->dev.parent) {
570 memset(&smc_pci_dev, 0, sizeof(smc_pci_dev));
571 pci_dev = to_pci_dev(smcibdev->ibdev->dev.parent);
572 smc_set_pci_values(pci_dev, &smc_pci_dev);
573 if (!smc_nl_handle_pci_values(&smc_pci_dev, skb))
574 goto errattr;
575 }
Guvenc Gulcea3db10e2020-12-01 20:20:49 +0100576 snprintf(smc_ibname, sizeof(smc_ibname), "%s", smcibdev->ibdev->name);
577 if (nla_put_string(skb, SMC_NLA_DEV_IB_NAME, smc_ibname))
578 goto errattr;
579 for (i = 1; i <= SMC_MAX_PORTS; i++) {
580 if (!rdma_is_port_valid(smcibdev->ibdev, i))
581 continue;
582 if (smc_nl_handle_dev_port(skb, smcibdev->ibdev,
583 smcibdev, i - 1))
584 goto errattr;
585 }
586
587 nla_nest_end(skb, attrs);
588 genlmsg_end(skb, nlh);
589 return 0;
590
591errattr:
592 nla_nest_cancel(skb, attrs);
593errout:
594 genlmsg_cancel(skb, nlh);
595errmsg:
596 return -EMSGSIZE;
597}
598
599static void smc_nl_prep_smcr_dev(struct smc_ib_devices *dev_list,
600 struct sk_buff *skb,
601 struct netlink_callback *cb)
602{
603 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
604 struct smc_ib_device *smcibdev;
605 int snum = cb_ctx->pos[0];
606 int num = 0;
607
608 mutex_lock(&dev_list->mutex);
609 list_for_each_entry(smcibdev, &dev_list->list, list) {
610 if (num < snum)
611 goto next;
612 if (smc_nl_handle_smcr_dev(smcibdev, skb, cb))
613 goto errout;
614next:
615 num++;
616 }
617errout:
618 mutex_unlock(&dev_list->mutex);
619 cb_ctx->pos[0] = num;
620}
621
622int smcr_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb)
623{
624 smc_nl_prep_smcr_dev(&smc_ib_devices, skb, cb);
625 return skb->len;
626}
627
Ursula Braunf38ba1792017-01-09 16:55:19 +0100628static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv)
629{
Karsten Graule5f3aa02019-01-30 18:51:07 +0100630 struct smc_link *lnk = (struct smc_link *)priv;
631 struct smc_ib_device *smcibdev = lnk->smcibdev;
Ursula Braunda05bf22018-01-26 09:28:46 +0100632 u8 port_idx;
633
Ursula Braunf38ba1792017-01-09 16:55:19 +0100634 switch (ibevent->event) {
Karsten Graul81cf6432019-02-12 16:29:55 +0100635 case IB_EVENT_QP_FATAL:
Ursula Braunf38ba1792017-01-09 16:55:19 +0100636 case IB_EVENT_QP_ACCESS_ERR:
Karsten Graule5f3aa02019-01-30 18:51:07 +0100637 port_idx = ibevent->element.qp->port - 1;
Ursula Braun5613f202020-02-17 16:24:55 +0100638 if (port_idx >= SMC_MAX_PORTS)
639 break;
640 set_bit(port_idx, &smcibdev->port_event_mask);
641 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
Karsten Graul81cf6432019-02-12 16:29:55 +0100642 schedule_work(&smcibdev->port_event_work);
Ursula Braunf38ba1792017-01-09 16:55:19 +0100643 break;
644 default:
645 break;
646 }
647}
648
649void smc_ib_destroy_queue_pair(struct smc_link *lnk)
650{
Ursula Braunda05bf22018-01-26 09:28:46 +0100651 if (lnk->roce_qp)
652 ib_destroy_qp(lnk->roce_qp);
Ursula Braunf38ba1792017-01-09 16:55:19 +0100653 lnk->roce_qp = NULL;
654}
655
656/* create a queue pair within the protection domain for a link */
657int smc_ib_create_queue_pair(struct smc_link *lnk)
658{
Karsten Graul8799e312021-10-16 11:37:49 +0200659 int sges_per_buf = (lnk->lgr->smc_version == SMC_V2) ? 2 : 1;
Ursula Braunf38ba1792017-01-09 16:55:19 +0100660 struct ib_qp_init_attr qp_attr = {
661 .event_handler = smc_ib_qp_event_handler,
662 .qp_context = lnk,
663 .send_cq = lnk->smcibdev->roce_cq_send,
664 .recv_cq = lnk->smcibdev->roce_cq_recv,
665 .srq = NULL,
666 .cap = {
Ursula Braunf38ba1792017-01-09 16:55:19 +0100667 /* include unsolicited rdma_writes as well,
668 * there are max. 2 RDMA_WRITE per 1 WR_SEND
669 */
Ursula Braun652a1e42017-07-28 13:56:17 +0200670 .max_send_wr = SMC_WR_BUF_CNT * 3,
Ursula Braunf38ba1792017-01-09 16:55:19 +0100671 .max_recv_wr = SMC_WR_BUF_CNT * 3,
672 .max_send_sge = SMC_IB_MAX_SEND_SGE,
Karsten Graul8799e312021-10-16 11:37:49 +0200673 .max_recv_sge = sges_per_buf,
Guangguan Wangb632eb02022-05-16 13:51:36 +0800674 .max_inline_data = 0,
Ursula Braunf38ba1792017-01-09 16:55:19 +0100675 },
676 .sq_sig_type = IB_SIGNAL_REQ_WR,
677 .qp_type = IB_QPT_RC,
678 };
679 int rc;
680
681 lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr);
682 rc = PTR_ERR_OR_ZERO(lnk->roce_qp);
683 if (IS_ERR(lnk->roce_qp))
684 lnk->roce_qp = NULL;
685 else
686 smc_wr_remember_qp_attr(lnk);
687 return rc;
688}
689
Ursula Braun897e1c22017-07-28 13:56:16 +0200690void smc_ib_put_memory_region(struct ib_mr *mr)
691{
692 ib_dereg_mr(mr);
693}
694
Karsten Graul387707f2020-04-29 17:10:40 +0200695static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot, u8 link_idx)
Ursula Braun897e1c22017-07-28 13:56:16 +0200696{
697 unsigned int offset = 0;
698 int sg_num;
699
700 /* map the largest prefix of a dma mapped SG list */
Wen Gub8d19942022-07-14 17:44:04 +0800701 sg_num = ib_map_mr_sg(buf_slot->mr[link_idx],
Karsten Graul387707f2020-04-29 17:10:40 +0200702 buf_slot->sgt[link_idx].sgl,
703 buf_slot->sgt[link_idx].orig_nents,
Ursula Braun897e1c22017-07-28 13:56:16 +0200704 &offset, PAGE_SIZE);
705
706 return sg_num;
707}
708
709/* Allocate a memory region and map the dma mapped SG list of buf_slot */
710int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
Karsten Graul387707f2020-04-29 17:10:40 +0200711 struct smc_buf_desc *buf_slot, u8 link_idx)
Ursula Braun897e1c22017-07-28 13:56:16 +0200712{
Wen Gub8d19942022-07-14 17:44:04 +0800713 if (buf_slot->mr[link_idx])
Ursula Braun897e1c22017-07-28 13:56:16 +0200714 return 0; /* already done */
715
Wen Gub8d19942022-07-14 17:44:04 +0800716 buf_slot->mr[link_idx] =
Ursula Braun897e1c22017-07-28 13:56:16 +0200717 ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order);
Wen Gub8d19942022-07-14 17:44:04 +0800718 if (IS_ERR(buf_slot->mr[link_idx])) {
Ursula Braun897e1c22017-07-28 13:56:16 +0200719 int rc;
720
Wen Gub8d19942022-07-14 17:44:04 +0800721 rc = PTR_ERR(buf_slot->mr[link_idx]);
722 buf_slot->mr[link_idx] = NULL;
Ursula Braun897e1c22017-07-28 13:56:16 +0200723 return rc;
724 }
725
Wen Gub8d19942022-07-14 17:44:04 +0800726 if (smc_ib_map_mr_sg(buf_slot, link_idx) !=
727 buf_slot->sgt[link_idx].orig_nents)
Ursula Braun897e1c22017-07-28 13:56:16 +0200728 return -EINVAL;
729
730 return 0;
731}
732
Guangguan Wang0ef69e72022-07-14 17:44:01 +0800733bool smc_ib_is_sg_need_sync(struct smc_link *lnk,
734 struct smc_buf_desc *buf_slot)
735{
736 struct scatterlist *sg;
737 unsigned int i;
738 bool ret = false;
739
740 /* for now there is just one DMA address */
741 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
742 buf_slot->sgt[lnk->link_idx].nents, i) {
743 if (!sg_dma_len(sg))
744 break;
745 if (dma_need_sync(lnk->smcibdev->ibdev->dma_device,
746 sg_dma_address(sg))) {
747 ret = true;
748 goto out;
749 }
750 }
751
752out:
753 return ret;
754}
755
Ursula Braun10428dd2017-07-28 13:56:22 +0200756/* synchronize buffer usage for cpu access */
Karsten Graul387707f2020-04-29 17:10:40 +0200757void smc_ib_sync_sg_for_cpu(struct smc_link *lnk,
Ursula Braun10428dd2017-07-28 13:56:22 +0200758 struct smc_buf_desc *buf_slot,
759 enum dma_data_direction data_direction)
760{
761 struct scatterlist *sg;
762 unsigned int i;
763
Guangguan Wang0ef69e72022-07-14 17:44:01 +0800764 if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx)))
765 return;
766
Ursula Braun10428dd2017-07-28 13:56:22 +0200767 /* for now there is just one DMA address */
Karsten Graul387707f2020-04-29 17:10:40 +0200768 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
769 buf_slot->sgt[lnk->link_idx].nents, i) {
Ursula Braun10428dd2017-07-28 13:56:22 +0200770 if (!sg_dma_len(sg))
771 break;
Karsten Graul387707f2020-04-29 17:10:40 +0200772 ib_dma_sync_single_for_cpu(lnk->smcibdev->ibdev,
Ursula Braun10428dd2017-07-28 13:56:22 +0200773 sg_dma_address(sg),
774 sg_dma_len(sg),
775 data_direction);
776 }
777}
778
779/* synchronize buffer usage for device access */
Karsten Graul387707f2020-04-29 17:10:40 +0200780void smc_ib_sync_sg_for_device(struct smc_link *lnk,
Ursula Braun10428dd2017-07-28 13:56:22 +0200781 struct smc_buf_desc *buf_slot,
782 enum dma_data_direction data_direction)
783{
784 struct scatterlist *sg;
785 unsigned int i;
786
Guangguan Wang0ef69e72022-07-14 17:44:01 +0800787 if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx)))
788 return;
789
Ursula Braun10428dd2017-07-28 13:56:22 +0200790 /* for now there is just one DMA address */
Karsten Graul387707f2020-04-29 17:10:40 +0200791 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
792 buf_slot->sgt[lnk->link_idx].nents, i) {
Ursula Braun10428dd2017-07-28 13:56:22 +0200793 if (!sg_dma_len(sg))
794 break;
Karsten Graul387707f2020-04-29 17:10:40 +0200795 ib_dma_sync_single_for_device(lnk->smcibdev->ibdev,
Ursula Braun10428dd2017-07-28 13:56:22 +0200796 sg_dma_address(sg),
797 sg_dma_len(sg),
798 data_direction);
799 }
800}
801
Ursula Brauna3fe3d02017-07-28 13:56:15 +0200802/* Map a new TX or RX buffer SG-table to DMA */
Karsten Graul387707f2020-04-29 17:10:40 +0200803int smc_ib_buf_map_sg(struct smc_link *lnk,
Ursula Brauna3fe3d02017-07-28 13:56:15 +0200804 struct smc_buf_desc *buf_slot,
805 enum dma_data_direction data_direction)
806{
807 int mapped_nents;
808
Karsten Graul387707f2020-04-29 17:10:40 +0200809 mapped_nents = ib_dma_map_sg(lnk->smcibdev->ibdev,
810 buf_slot->sgt[lnk->link_idx].sgl,
811 buf_slot->sgt[lnk->link_idx].orig_nents,
Ursula Brauna3fe3d02017-07-28 13:56:15 +0200812 data_direction);
813 if (!mapped_nents)
814 return -ENOMEM;
815
816 return mapped_nents;
817}
818
Karsten Graul387707f2020-04-29 17:10:40 +0200819void smc_ib_buf_unmap_sg(struct smc_link *lnk,
Ursula Brauna3fe3d02017-07-28 13:56:15 +0200820 struct smc_buf_desc *buf_slot,
821 enum dma_data_direction data_direction)
822{
Karsten Graul387707f2020-04-29 17:10:40 +0200823 if (!buf_slot->sgt[lnk->link_idx].sgl->dma_address)
Ursula Brauna3fe3d02017-07-28 13:56:15 +0200824 return; /* already unmapped */
825
Karsten Graul387707f2020-04-29 17:10:40 +0200826 ib_dma_unmap_sg(lnk->smcibdev->ibdev,
827 buf_slot->sgt[lnk->link_idx].sgl,
828 buf_slot->sgt[lnk->link_idx].orig_nents,
Ursula Brauna3fe3d02017-07-28 13:56:15 +0200829 data_direction);
Karsten Graul387707f2020-04-29 17:10:40 +0200830 buf_slot->sgt[lnk->link_idx].sgl->dma_address = 0;
Ursula Brauna3fe3d02017-07-28 13:56:15 +0200831}
832
Ursula Braunbd4ad572017-01-09 16:55:20 +0100833long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev)
834{
835 struct ib_cq_init_attr cqattr = {
Ursula Braunc9f4c6c2018-03-14 11:01:00 +0100836 .cqe = SMC_MAX_CQE, .comp_vector = 0 };
837 int cqe_size_order, smc_order;
Ursula Braunbd4ad572017-01-09 16:55:20 +0100838 long rc;
839
Karsten Graul63673592020-07-18 15:06:12 +0200840 mutex_lock(&smcibdev->mutex);
841 rc = 0;
842 if (smcibdev->initialized)
843 goto out;
Ursula Braunc9f4c6c2018-03-14 11:01:00 +0100844 /* the calculated number of cq entries fits to mlx5 cq allocation */
845 cqe_size_order = cache_line_size() == 128 ? 7 : 6;
846 smc_order = MAX_ORDER - cqe_size_order - 1;
847 if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE)
848 cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2;
Ursula Braunbd4ad572017-01-09 16:55:20 +0100849 smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev,
850 smc_wr_tx_cq_handler, NULL,
851 smcibdev, &cqattr);
852 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send);
853 if (IS_ERR(smcibdev->roce_cq_send)) {
854 smcibdev->roce_cq_send = NULL;
Karsten Graul63673592020-07-18 15:06:12 +0200855 goto out;
Ursula Braunbd4ad572017-01-09 16:55:20 +0100856 }
857 smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev,
858 smc_wr_rx_cq_handler, NULL,
859 smcibdev, &cqattr);
860 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv);
861 if (IS_ERR(smcibdev->roce_cq_recv)) {
862 smcibdev->roce_cq_recv = NULL;
863 goto err;
864 }
Ursula Braunbd4ad572017-01-09 16:55:20 +0100865 smc_wr_add_dev(smcibdev);
866 smcibdev->initialized = 1;
Karsten Graul63673592020-07-18 15:06:12 +0200867 goto out;
Ursula Braunbd4ad572017-01-09 16:55:20 +0100868
869err:
870 ib_destroy_cq(smcibdev->roce_cq_send);
Karsten Graul63673592020-07-18 15:06:12 +0200871out:
872 mutex_unlock(&smcibdev->mutex);
Ursula Braunbd4ad572017-01-09 16:55:20 +0100873 return rc;
874}
875
876static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev)
877{
Karsten Graul63673592020-07-18 15:06:12 +0200878 mutex_lock(&smcibdev->mutex);
Ursula Braunbd4ad572017-01-09 16:55:20 +0100879 if (!smcibdev->initialized)
Karsten Graul63673592020-07-18 15:06:12 +0200880 goto out;
Ursula Braunda05bf22018-01-26 09:28:46 +0100881 smcibdev->initialized = 0;
Ursula Braunbd4ad572017-01-09 16:55:20 +0100882 ib_destroy_cq(smcibdev->roce_cq_recv);
883 ib_destroy_cq(smcibdev->roce_cq_send);
Ursula Braun6a37ad32019-11-14 13:02:46 +0100884 smc_wr_remove_dev(smcibdev);
Karsten Graul63673592020-07-18 15:06:12 +0200885out:
886 mutex_unlock(&smcibdev->mutex);
Ursula Braunbd4ad572017-01-09 16:55:20 +0100887}
888
Ursula Brauna4cf0442017-01-09 16:55:14 +0100889static struct ib_client smc_ib_client;
890
Guvenc Gulce3d453f52020-12-01 20:20:40 +0100891static void smc_copy_netdev_ifindex(struct smc_ib_device *smcibdev, int port)
892{
893 struct ib_device *ibdev = smcibdev->ibdev;
894 struct net_device *ndev;
895
896 if (!ibdev->ops.get_netdev)
897 return;
898 ndev = ibdev->ops.get_netdev(ibdev, port + 1);
899 if (ndev) {
900 smcibdev->ndev_ifidx[port] = ndev->ifindex;
901 dev_put(ndev);
902 }
903}
904
905void smc_ib_ndev_change(struct net_device *ndev, unsigned long event)
906{
907 struct smc_ib_device *smcibdev;
908 struct ib_device *libdev;
909 struct net_device *lndev;
910 u8 port_cnt;
911 int i;
912
913 mutex_lock(&smc_ib_devices.mutex);
914 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
915 port_cnt = smcibdev->ibdev->phys_port_cnt;
916 for (i = 0; i < min_t(size_t, port_cnt, SMC_MAX_PORTS); i++) {
917 libdev = smcibdev->ibdev;
918 if (!libdev->ops.get_netdev)
919 continue;
920 lndev = libdev->ops.get_netdev(libdev, i + 1);
Yajun Deng1160dfa2021-08-05 19:55:27 +0800921 dev_put(lndev);
Guvenc Gulce3d453f52020-12-01 20:20:40 +0100922 if (lndev != ndev)
923 continue;
924 if (event == NETDEV_REGISTER)
925 smcibdev->ndev_ifidx[i] = ndev->ifindex;
926 if (event == NETDEV_UNREGISTER)
927 smcibdev->ndev_ifidx[i] = 0;
928 }
929 }
930 mutex_unlock(&smc_ib_devices.mutex);
931}
932
Ursula Brauna4cf0442017-01-09 16:55:14 +0100933/* callback function for ib_register_client() */
Jason Gunthorpe11a0ae42020-04-21 20:24:40 +0300934static int smc_ib_add_dev(struct ib_device *ibdev)
Ursula Brauna4cf0442017-01-09 16:55:14 +0100935{
936 struct smc_ib_device *smcibdev;
Ursula Braunbe6a3f32018-06-28 19:05:04 +0200937 u8 port_cnt;
938 int i;
Ursula Brauna4cf0442017-01-09 16:55:14 +0100939
940 if (ibdev->node_type != RDMA_NODE_IB_CA)
Jason Gunthorpe11a0ae42020-04-21 20:24:40 +0300941 return -EOPNOTSUPP;
Ursula Brauna4cf0442017-01-09 16:55:14 +0100942
943 smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL);
944 if (!smcibdev)
Jason Gunthorpe11a0ae42020-04-21 20:24:40 +0300945 return -ENOMEM;
Ursula Brauna4cf0442017-01-09 16:55:14 +0100946
947 smcibdev->ibdev = ibdev;
Ursula Braunbd4ad572017-01-09 16:55:20 +0100948 INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work);
Ursula Braun6dabd402019-11-16 17:47:29 +0100949 atomic_set(&smcibdev->lnk_cnt, 0);
950 init_waitqueue_head(&smcibdev->lnks_deleted);
Karsten Graul63673592020-07-18 15:06:12 +0200951 mutex_init(&smcibdev->mutex);
Ursula Braun92f3cb02020-07-08 17:05:13 +0200952 mutex_lock(&smc_ib_devices.mutex);
Ursula Brauna4cf0442017-01-09 16:55:14 +0100953 list_add_tail(&smcibdev->list, &smc_ib_devices.list);
Ursula Braun92f3cb02020-07-08 17:05:13 +0200954 mutex_unlock(&smc_ib_devices.mutex);
Ursula Brauna4cf0442017-01-09 16:55:14 +0100955 ib_set_client_data(ibdev, &smc_ib_client, smcibdev);
Ursula Braunbe6a3f32018-06-28 19:05:04 +0200956 INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev,
957 smc_ib_global_event_handler);
958 ib_register_event_handler(&smcibdev->event_handler);
959
960 /* trigger reading of the port attributes */
961 port_cnt = smcibdev->ibdev->phys_port_cnt;
Karsten Graul0a99be42020-05-05 15:01:20 +0200962 pr_warn_ratelimited("smc: adding ib device %s with port count %d\n",
963 smcibdev->ibdev->name, port_cnt);
Ursula Braunbe6a3f32018-06-28 19:05:04 +0200964 for (i = 0;
965 i < min_t(size_t, port_cnt, SMC_MAX_PORTS);
Ursula Braun0afff912018-06-28 19:05:05 +0200966 i++) {
Ursula Braunbe6a3f32018-06-28 19:05:04 +0200967 set_bit(i, &smcibdev->port_event_mask);
Ursula Braun0afff912018-06-28 19:05:05 +0200968 /* determine pnetids of the port */
Karsten Graulfdff7042020-04-29 17:10:37 +0200969 if (smc_pnetid_by_dev_port(ibdev->dev.parent, i,
970 smcibdev->pnetid[i]))
971 smc_pnetid_by_table_ib(smcibdev, i + 1);
Guvenc Gulce3d453f52020-12-01 20:20:40 +0100972 smc_copy_netdev_ifindex(smcibdev, i);
Karsten Graul0a99be42020-05-05 15:01:20 +0200973 pr_warn_ratelimited("smc: ib device %s port %d has pnetid "
974 "%.16s%s\n",
975 smcibdev->ibdev->name, i + 1,
976 smcibdev->pnetid[i],
977 smcibdev->pnetid_by_user[i] ?
978 " (user defined)" :
979 "");
Ursula Braun0afff912018-06-28 19:05:05 +0200980 }
Ursula Braunbe6a3f32018-06-28 19:05:04 +0200981 schedule_work(&smcibdev->port_event_work);
Jason Gunthorpe11a0ae42020-04-21 20:24:40 +0300982 return 0;
Ursula Brauna4cf0442017-01-09 16:55:14 +0100983}
984
Ursula Braun0b29ec642019-11-14 13:02:47 +0100985/* callback function for ib_unregister_client() */
Ursula Brauna4cf0442017-01-09 16:55:14 +0100986static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data)
987{
Jason Gunthorpe15879822020-04-07 20:20:09 -0300988 struct smc_ib_device *smcibdev = client_data;
Ursula Brauna4cf0442017-01-09 16:55:14 +0100989
Ursula Braun92f3cb02020-07-08 17:05:13 +0200990 mutex_lock(&smc_ib_devices.mutex);
Ursula Brauna4cf0442017-01-09 16:55:14 +0100991 list_del_init(&smcibdev->list); /* remove from smc_ib_devices */
Ursula Braun92f3cb02020-07-08 17:05:13 +0200992 mutex_unlock(&smc_ib_devices.mutex);
Karsten Graul0a99be42020-05-05 15:01:20 +0200993 pr_warn_ratelimited("smc: removing ib device %s\n",
994 smcibdev->ibdev->name);
Ursula Braun0b29ec642019-11-14 13:02:47 +0100995 smc_smcr_terminate_all(smcibdev);
Ursula Braunbd4ad572017-01-09 16:55:20 +0100996 smc_ib_cleanup_per_ibdev(smcibdev);
Ursula Braunbe6a3f32018-06-28 19:05:04 +0200997 ib_unregister_event_handler(&smcibdev->event_handler);
Karsten Graulece0d7bd2020-03-10 09:33:30 +0100998 cancel_work_sync(&smcibdev->port_event_work);
Ursula Brauna4cf0442017-01-09 16:55:14 +0100999 kfree(smcibdev);
1000}
1001
1002static struct ib_client smc_ib_client = {
1003 .name = "smc_ib",
1004 .add = smc_ib_add_dev,
1005 .remove = smc_ib_remove_dev,
1006};
1007
1008int __init smc_ib_register_client(void)
1009{
Hans Wippel366bb242020-02-25 22:41:21 +01001010 smc_ib_init_local_systemid();
Ursula Brauna4cf0442017-01-09 16:55:14 +01001011 return ib_register_client(&smc_ib_client);
1012}
1013
1014void smc_ib_unregister_client(void)
1015{
1016 ib_unregister_client(&smc_ib_client);
1017}