blob: 2c3dca41d3bd9f22872a619ba69d503e7d4c0b9d [file] [log] [blame]
/*
* Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
* Copyright (c) 2005 Mellanox Technologies. All rights reserved.
* Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/delay.h>
#include <linux/moduleparam.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <rdma/ib_cache.h>
#include "ipoib.h"
#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
static int data_debug_level;
module_param(data_debug_level, int, 0644);
MODULE_PARM_DESC(data_debug_level,
"Enable data path debug tracing if > 0");
#endif
struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
struct ib_pd *pd, struct rdma_ah_attr *attr)
{
struct ipoib_ah *ah;
struct ib_ah *vah;
ah = kmalloc(sizeof(*ah), GFP_KERNEL);
if (!ah)
return ERR_PTR(-ENOMEM);
ah->dev = dev;
ah->last_send = 0;
kref_init(&ah->ref);
vah = rdma_create_ah(pd, attr, RDMA_CREATE_AH_SLEEPABLE);
if (IS_ERR(vah)) {
kfree(ah);
ah = (struct ipoib_ah *)vah;
} else {
ah->ah = vah;
ipoib_dbg(ipoib_priv(dev), "Created ah %p\n", ah->ah);
}
return ah;
}
void ipoib_free_ah(struct kref *kref)
{
struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
struct ipoib_dev_priv *priv = ipoib_priv(ah->dev);
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
list_add_tail(&ah->list, &priv->dead_ahs);
spin_unlock_irqrestore(&priv->lock, flags);
}
static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
u64 mapping[IPOIB_UD_RX_SG])
{
ib_dma_unmap_single(priv->ca, mapping[0],
IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
DMA_FROM_DEVICE);
}
static int ipoib_ib_post_receive(struct net_device *dev, int id)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
int ret;
priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
ret = ib_post_recv(priv->qp, &priv->rx_wr, NULL);
if (unlikely(ret)) {
ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
dev_kfree_skb_any(priv->rx_ring[id].skb);
priv->rx_ring[id].skb = NULL;
}
return ret;
}
static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct sk_buff *skb;
int buf_size;
u64 *mapping;
buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
skb = dev_alloc_skb(buf_size + IPOIB_HARD_LEN);
if (unlikely(!skb))
return NULL;
/*
* the IP header will be at IPOIP_HARD_LEN + IB_GRH_BYTES, that is
* 64 bytes aligned
*/
skb_reserve(skb, sizeof(struct ipoib_pseudo_header));
mapping = priv->rx_ring[id].mapping;
mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
DMA_FROM_DEVICE);
if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
goto error;
priv->rx_ring[id].skb = skb;
return skb;
error:
dev_kfree_skb_any(skb);
return NULL;
}
static int ipoib_ib_post_receives(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
int i;
for (i = 0; i < ipoib_recvq_size; ++i) {
if (!ipoib_alloc_rx_skb(dev, i)) {
ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
return -ENOMEM;
}
if (ipoib_ib_post_receive(dev, i)) {
ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
return -EIO;
}
}
return 0;
}
static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
struct sk_buff *skb;
u64 mapping[IPOIB_UD_RX_SG];
union ib_gid *dgid;
union ib_gid *sgid;
ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
wr_id, wc->status);
if (unlikely(wr_id >= ipoib_recvq_size)) {
ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
wr_id, ipoib_recvq_size);
return;
}
skb = priv->rx_ring[wr_id].skb;
if (unlikely(wc->status != IB_WC_SUCCESS)) {
if (wc->status != IB_WC_WR_FLUSH_ERR)
ipoib_warn(priv,
"failed recv event (status=%d, wrid=%d vend_err %#x)\n",
wc->status, wr_id, wc->vendor_err);
ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
dev_kfree_skb_any(skb);
priv->rx_ring[wr_id].skb = NULL;
return;
}
memcpy(mapping, priv->rx_ring[wr_id].mapping,
IPOIB_UD_RX_SG * sizeof(*mapping));
/*
* If we can't allocate a new RX buffer, dump
* this packet and reuse the old buffer.
*/
if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
++dev->stats.rx_dropped;
goto repost;
}
ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
wc->byte_len, wc->slid);
ipoib_ud_dma_unmap_rx(priv, mapping);
skb_put(skb, wc->byte_len);
/* First byte of dgid signals multicast when 0xff */
dgid = &((struct ib_grh *)skb->data)->dgid;
if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff)
skb->pkt_type = PACKET_HOST;
else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0)
skb->pkt_type = PACKET_BROADCAST;
else
skb->pkt_type = PACKET_MULTICAST;
sgid = &((struct ib_grh *)skb->data)->sgid;
/*
* Drop packets that this interface sent, ie multicast packets
* that the HCA has replicated.
*/
if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) {
int need_repost = 1;
if ((wc->wc_flags & IB_WC_GRH) &&
sgid->global.interface_id != priv->local_gid.global.interface_id)
need_repost = 0;
if (need_repost) {
dev_kfree_skb_any(skb);
goto repost;
}
}
skb_pull(skb, IB_GRH_BYTES);
skb->protocol = ((struct ipoib_header *) skb->data)->proto;
skb_add_pseudo_hdr(skb);
++dev->stats.rx_packets;
dev->stats.rx_bytes += skb->len;
if (skb->pkt_type == PACKET_MULTICAST)
dev->stats.multicast++;
skb->dev = dev;
if ((dev->features & NETIF_F_RXCSUM) &&
likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
skb->ip_summed = CHECKSUM_UNNECESSARY;
napi_gro_receive(&priv->recv_napi, skb);
repost:
if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
ipoib_warn(priv, "ipoib_ib_post_receive failed "
"for buf %d\n", wr_id);
}
int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req)
{
struct sk_buff *skb = tx_req->skb;
u64 *mapping = tx_req->mapping;
int i;
int off;
if (skb_headlen(skb)) {
mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
DMA_TO_DEVICE);
if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
return -EIO;
off = 1;
} else
off = 0;
for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
mapping[i + off] = ib_dma_map_page(ca,
skb_frag_page(frag),
skb_frag_off(frag),
skb_frag_size(frag),
DMA_TO_DEVICE);
if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
goto partial_error;
}
return 0;
partial_error:
for (; i > 0; --i) {
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE);
}
if (off)
ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
return -EIO;
}
void ipoib_dma_unmap_tx(struct ipoib_dev_priv *priv,
struct ipoib_tx_buf *tx_req)
{
struct sk_buff *skb = tx_req->skb;
u64 *mapping = tx_req->mapping;
int i;
int off;
if (skb_headlen(skb)) {
ib_dma_unmap_single(priv->ca, mapping[0], skb_headlen(skb),
DMA_TO_DEVICE);
off = 1;
} else
off = 0;
for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
ib_dma_unmap_page(priv->ca, mapping[i + off],
skb_frag_size(frag), DMA_TO_DEVICE);
}
}
/*
* As the result of a completion error the QP Can be transferred to SQE states.
* The function checks if the (send)QP is in SQE state and
* moves it back to RTS state, that in order to have it functional again.
*/
static void ipoib_qp_state_validate_work(struct work_struct *work)
{
struct ipoib_qp_state_validate *qp_work =
container_of(work, struct ipoib_qp_state_validate, work);
struct ipoib_dev_priv *priv = qp_work->priv;
struct ib_qp_attr qp_attr;
struct ib_qp_init_attr query_init_attr;
int ret;
ret = ib_query_qp(priv->qp, &qp_attr, IB_QP_STATE, &query_init_attr);
if (ret) {
ipoib_warn(priv, "%s: Failed to query QP ret: %d\n",
__func__, ret);
goto free_res;
}
pr_info("%s: QP: 0x%x is in state: %d\n",
__func__, priv->qp->qp_num, qp_attr.qp_state);
/* currently support only in SQE->RTS transition*/
if (qp_attr.qp_state == IB_QPS_SQE) {
qp_attr.qp_state = IB_QPS_RTS;
ret = ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE);
if (ret) {
pr_warn("failed(%d) modify QP:0x%x SQE->RTS\n",
ret, priv->qp->qp_num);
goto free_res;
}
pr_info("%s: QP: 0x%x moved from IB_QPS_SQE to IB_QPS_RTS\n",
__func__, priv->qp->qp_num);
} else {
pr_warn("QP (%d) will stay in state: %d\n",
priv->qp->qp_num, qp_attr.qp_state);
}
free_res:
kfree(qp_work);
}
static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
unsigned int wr_id = wc->wr_id;
struct ipoib_tx_buf *tx_req;
ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
wr_id, wc->status);
if (unlikely(wr_id >= ipoib_sendq_size)) {
ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
wr_id, ipoib_sendq_size);
return;
}
tx_req = &priv->tx_ring[wr_id];
ipoib_dma_unmap_tx(priv, tx_req);
++dev->stats.tx_packets;
dev->stats.tx_bytes += tx_req->skb->len;
dev_kfree_skb_any(tx_req->skb);
++priv->tx_tail;
++priv->global_tx_tail;
if (unlikely(netif_queue_stopped(dev) &&
((priv->global_tx_head - priv->global_tx_tail) <=
ipoib_sendq_size >> 1) &&
test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)))
netif_wake_queue(dev);
if (wc->status != IB_WC_SUCCESS &&
wc->status != IB_WC_WR_FLUSH_ERR) {
struct ipoib_qp_state_validate *qp_work;
ipoib_warn(priv,
"failed send event (status=%d, wrid=%d vend_err %#x)\n",
wc->status, wr_id, wc->vendor_err);
qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC);
if (!qp_work)
return;
INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work);
qp_work->priv = priv;
queue_work(priv->wq, &qp_work->work);
}
}
static int poll_tx(struct ipoib_dev_priv *priv)
{
int n, i;
struct ib_wc *wc;
n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
for (i = 0; i < n; ++i) {
wc = priv->send_wc + i;
if (wc->wr_id & IPOIB_OP_CM)
ipoib_cm_handle_tx_wc(priv->dev, priv->send_wc + i);
else
ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
}
return n == MAX_SEND_CQE;
}
int ipoib_rx_poll(struct napi_struct *napi, int budget)
{
struct ipoib_dev_priv *priv =
container_of(napi, struct ipoib_dev_priv, recv_napi);
struct net_device *dev = priv->dev;
int done;
int t;
int n, i;
done = 0;
poll_more:
while (done < budget) {
int max = (budget - done);
t = min(IPOIB_NUM_WC, max);
n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
for (i = 0; i < n; i++) {
struct ib_wc *wc = priv->ibwc + i;
if (wc->wr_id & IPOIB_OP_RECV) {
++done;
if (wc->wr_id & IPOIB_OP_CM)
ipoib_cm_handle_rx_wc(dev, wc);
else
ipoib_ib_handle_rx_wc(dev, wc);
} else {
pr_warn("%s: Got unexpected wqe id\n", __func__);
}
}
if (n != t)
break;
}
if (done < budget) {
napi_complete(napi);
if (unlikely(ib_req_notify_cq(priv->recv_cq,
IB_CQ_NEXT_COMP |
IB_CQ_REPORT_MISSED_EVENTS)) &&
napi_reschedule(napi))
goto poll_more;
}
return done;
}
int ipoib_tx_poll(struct napi_struct *napi, int budget)
{
struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv,
send_napi);
struct net_device *dev = priv->dev;
int n, i;
struct ib_wc *wc;
poll_more:
n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
for (i = 0; i < n; i++) {
wc = priv->send_wc + i;
if (wc->wr_id & IPOIB_OP_CM)
ipoib_cm_handle_tx_wc(dev, wc);
else
ipoib_ib_handle_tx_wc(dev, wc);
}
if (n < budget) {
napi_complete(napi);
if (unlikely(ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
IB_CQ_REPORT_MISSED_EVENTS)) &&
napi_reschedule(napi))
goto poll_more;
}
return n < 0 ? 0 : n;
}
void ipoib_ib_rx_completion(struct ib_cq *cq, void *ctx_ptr)
{
struct ipoib_dev_priv *priv = ctx_ptr;
napi_schedule(&priv->recv_napi);
}
void ipoib_ib_tx_completion(struct ib_cq *cq, void *ctx_ptr)
{
struct ipoib_dev_priv *priv = ctx_ptr;
napi_schedule(&priv->send_napi);
}
static inline int post_send(struct ipoib_dev_priv *priv,
unsigned int wr_id,
struct ib_ah *address, u32 dqpn,
struct ipoib_tx_buf *tx_req,
void *head, int hlen)
{
struct sk_buff *skb = tx_req->skb;
ipoib_build_sge(priv, tx_req);
priv->tx_wr.wr.wr_id = wr_id;
priv->tx_wr.remote_qpn = dqpn;
priv->tx_wr.ah = address;
if (head) {
priv->tx_wr.mss = skb_shinfo(skb)->gso_size;
priv->tx_wr.header = head;
priv->tx_wr.hlen = hlen;
priv->tx_wr.wr.opcode = IB_WR_LSO;
} else
priv->tx_wr.wr.opcode = IB_WR_SEND;
return ib_post_send(priv->qp, &priv->tx_wr.wr, NULL);
}
int ipoib_send(struct net_device *dev, struct sk_buff *skb,
struct ib_ah *address, u32 dqpn)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ipoib_tx_buf *tx_req;
int hlen, rc;
void *phead;
unsigned int usable_sge = priv->max_send_sge - !!skb_headlen(skb);
if (skb_is_gso(skb)) {
hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
phead = skb->data;
if (unlikely(!skb_pull(skb, hlen))) {
ipoib_warn(priv, "linear data too small\n");
++dev->stats.tx_dropped;
++dev->stats.tx_errors;
dev_kfree_skb_any(skb);
return -1;
}
} else {
if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
++dev->stats.tx_dropped;
++dev->stats.tx_errors;
ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
return -1;
}
phead = NULL;
hlen = 0;
}
if (skb_shinfo(skb)->nr_frags > usable_sge) {
if (skb_linearize(skb) < 0) {
ipoib_warn(priv, "skb could not be linearized\n");
++dev->stats.tx_dropped;
++dev->stats.tx_errors;
dev_kfree_skb_any(skb);
return -1;
}
/* Does skb_linearize return ok without reducing nr_frags? */
if (skb_shinfo(skb)->nr_frags > usable_sge) {
ipoib_warn(priv, "too many frags after skb linearize\n");
++dev->stats.tx_dropped;
++dev->stats.tx_errors;
dev_kfree_skb_any(skb);
return -1;
}
}
ipoib_dbg_data(priv,
"sending packet, length=%d address=%p dqpn=0x%06x\n",
skb->len, address, dqpn);
/*
* We put the skb into the tx_ring _before_ we call post_send()
* because it's entirely possible that the completion handler will
* run before we execute anything after the post_send(). That
* means we have to make sure everything is properly recorded and
* our state is consistent before we call post_send().
*/
tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
tx_req->skb = skb;
if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
++dev->stats.tx_errors;
dev_kfree_skb_any(skb);
return -1;
}
if (skb->ip_summed == CHECKSUM_PARTIAL)
priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM;
else
priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
/* increase the tx_head after send success, but use it for queue state */
if ((priv->global_tx_head - priv->global_tx_tail) ==
ipoib_sendq_size - 1) {
ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
netif_stop_queue(dev);
}
skb_orphan(skb);
skb_dst_drop(skb);
if (netif_queue_stopped(dev))
if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
IB_CQ_REPORT_MISSED_EVENTS) < 0)
ipoib_warn(priv, "request notify on send CQ failed\n");
rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
address, dqpn, tx_req, phead, hlen);
if (unlikely(rc)) {
ipoib_warn(priv, "post_send failed, error %d\n", rc);
++dev->stats.tx_errors;
ipoib_dma_unmap_tx(priv, tx_req);
dev_kfree_skb_any(skb);
if (netif_queue_stopped(dev))
netif_wake_queue(dev);
rc = 0;
} else {
netif_trans_update(dev);
rc = priv->tx_head;
++priv->tx_head;
++priv->global_tx_head;
}
return rc;
}
static void ipoib_reap_dead_ahs(struct ipoib_dev_priv *priv)
{
struct ipoib_ah *ah, *tah;
unsigned long flags;
netif_tx_lock_bh(priv->dev);
spin_lock_irqsave(&priv->lock, flags);
list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
list_del(&ah->list);
rdma_destroy_ah(ah->ah, 0);
kfree(ah);
}
spin_unlock_irqrestore(&priv->lock, flags);
netif_tx_unlock_bh(priv->dev);
}
void ipoib_reap_ah(struct work_struct *work)
{
struct ipoib_dev_priv *priv =
container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
ipoib_reap_dead_ahs(priv);
if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
queue_delayed_work(priv->wq, &priv->ah_reap_task,
round_jiffies_relative(HZ));
}
static void ipoib_start_ah_reaper(struct ipoib_dev_priv *priv)
{
clear_bit(IPOIB_STOP_REAPER, &priv->flags);
queue_delayed_work(priv->wq, &priv->ah_reap_task,
round_jiffies_relative(HZ));
}
static void ipoib_stop_ah_reaper(struct ipoib_dev_priv *priv)
{
set_bit(IPOIB_STOP_REAPER, &priv->flags);
cancel_delayed_work(&priv->ah_reap_task);
/*
* After ipoib_stop_ah_reaper() we always go through
* ipoib_reap_dead_ahs() which ensures the work is really stopped and
* does a final flush out of the dead_ah's list
*/
}
static int recvs_pending(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
int pending = 0;
int i;
for (i = 0; i < ipoib_recvq_size; ++i)
if (priv->rx_ring[i].skb)
++pending;
return pending;
}
static void check_qp_movement_and_print(struct ipoib_dev_priv *priv,
struct ib_qp *qp,
enum ib_qp_state new_state)
{
struct ib_qp_attr qp_attr;
struct ib_qp_init_attr query_init_attr;
int ret;
ret = ib_query_qp(qp, &qp_attr, IB_QP_STATE, &query_init_attr);
if (ret) {
ipoib_warn(priv, "%s: Failed to query QP\n", __func__);
return;
}
/* print according to the new-state and the previous state.*/
if (new_state == IB_QPS_ERR && qp_attr.qp_state == IB_QPS_RESET)
ipoib_dbg(priv, "Failed modify QP, IB_QPS_RESET to IB_QPS_ERR, acceptable\n");
else
ipoib_warn(priv, "Failed to modify QP to state: %d from state: %d\n",
new_state, qp_attr.qp_state);
}
static void ipoib_napi_enable(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
napi_enable(&priv->recv_napi);
napi_enable(&priv->send_napi);
}
static void ipoib_napi_disable(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
napi_disable(&priv->recv_napi);
napi_disable(&priv->send_napi);
}
int ipoib_ib_dev_stop_default(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ib_qp_attr qp_attr;
unsigned long begin;
struct ipoib_tx_buf *tx_req;
int i;
if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
ipoib_napi_disable(dev);
ipoib_cm_dev_stop(dev);
/*
* Move our QP to the error state and then reinitialize in
* when all work requests have completed or have been flushed.
*/
qp_attr.qp_state = IB_QPS_ERR;
if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
check_qp_movement_and_print(priv, priv->qp, IB_QPS_ERR);
/* Wait for all sends and receives to complete */
begin = jiffies;
while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
if (time_after(jiffies, begin + 5 * HZ)) {
ipoib_warn(priv,
"timing out; %d sends %d receives not completed\n",
priv->tx_head - priv->tx_tail,
recvs_pending(dev));
/*
* assume the HW is wedged and just free up
* all our pending work requests.
*/
while ((int)priv->tx_tail - (int)priv->tx_head < 0) {
tx_req = &priv->tx_ring[priv->tx_tail &
(ipoib_sendq_size - 1)];
ipoib_dma_unmap_tx(priv, tx_req);
dev_kfree_skb_any(tx_req->skb);
++priv->tx_tail;
++priv->global_tx_tail;
}
for (i = 0; i < ipoib_recvq_size; ++i) {
struct ipoib_rx_buf *rx_req;
rx_req = &priv->rx_ring[i];
if (!rx_req->skb)
continue;
ipoib_ud_dma_unmap_rx(priv,
priv->rx_ring[i].mapping);
dev_kfree_skb_any(rx_req->skb);
rx_req->skb = NULL;
}
goto timeout;
}
ipoib_drain_cq(dev);
usleep_range(1000, 2000);
}
ipoib_dbg(priv, "All sends and receives done.\n");
timeout:
qp_attr.qp_state = IB_QPS_RESET;
if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
ipoib_warn(priv, "Failed to modify QP to RESET state\n");
ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
return 0;
}
int ipoib_ib_dev_open_default(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
int ret;
ret = ipoib_init_qp(dev);
if (ret) {
ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
return -1;
}
ret = ipoib_ib_post_receives(dev);
if (ret) {
ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
goto out;
}
ret = ipoib_cm_dev_open(dev);
if (ret) {
ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
goto out;
}
if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
ipoib_napi_enable(dev);
return 0;
out:
return -1;
}
int ipoib_ib_dev_open(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
ipoib_pkey_dev_check_presence(dev);
if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey,
(!(priv->pkey & 0x7fff) ? "Invalid" : "not found"));
return -1;
}
ipoib_start_ah_reaper(priv);
if (priv->rn_ops->ndo_open(dev)) {
pr_warn("%s: Failed to open dev\n", dev->name);
goto dev_stop;
}
set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
return 0;
dev_stop:
ipoib_stop_ah_reaper(priv);
return -1;
}
void ipoib_ib_dev_stop(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
priv->rn_ops->ndo_stop(dev);
clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
ipoib_stop_ah_reaper(priv);
}
void ipoib_pkey_dev_check_presence(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct rdma_netdev *rn = netdev_priv(dev);
if (!(priv->pkey & 0x7fff) ||
ib_find_pkey(priv->ca, priv->port, priv->pkey,
&priv->pkey_index)) {
clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
} else {
if (rn->set_id)
rn->set_id(dev, priv->pkey_index);
set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
}
}
void ipoib_ib_dev_up(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
ipoib_pkey_dev_check_presence(dev);
if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
ipoib_dbg(priv, "PKEY is not assigned.\n");
return;
}
set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
ipoib_mcast_start_thread(dev);
}
void ipoib_ib_dev_down(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
ipoib_dbg(priv, "downing ib_dev\n");
clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
netif_carrier_off(dev);
ipoib_mcast_stop_thread(dev);
ipoib_mcast_dev_flush(dev);
ipoib_flush_paths(dev);
}
void ipoib_drain_cq(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
int i, n;
/*
* We call completion handling routines that expect to be
* called from the BH-disabled NAPI poll context, so disable
* BHs here too.
*/
local_bh_disable();
do {
n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
for (i = 0; i < n; ++i) {
/*
* Convert any successful completions to flush
* errors to avoid passing packets up the
* stack after bringing the device down.
*/
if (priv->ibwc[i].status == IB_WC_SUCCESS)
priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
else
ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
} else {
pr_warn("%s: Got unexpected wqe id\n", __func__);
}
}
} while (n == IPOIB_NUM_WC);
while (poll_tx(priv))
; /* nothing */
local_bh_enable();
}
/*
* Takes whatever value which is in pkey index 0 and updates priv->pkey
* returns 0 if the pkey value was changed.
*/
static inline int update_parent_pkey(struct ipoib_dev_priv *priv)
{
int result;
u16 prev_pkey;
prev_pkey = priv->pkey;
result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
if (result) {
ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n",
priv->port, result);
return result;
}
priv->pkey |= 0x8000;
if (prev_pkey != priv->pkey) {
ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n",
prev_pkey, priv->pkey);
/*
* Update the pkey in the broadcast address, while making sure to set
* the full membership bit, so that we join the right broadcast group.
*/
priv->dev->broadcast[8] = priv->pkey >> 8;
priv->dev->broadcast[9] = priv->pkey & 0xff;
return 0;
}
return 1;
}
/*
* returns 0 if pkey value was found in a different slot.
*/
static inline int update_child_pkey(struct ipoib_dev_priv *priv)
{
u16 old_index = priv->pkey_index;
priv->pkey_index = 0;
ipoib_pkey_dev_check_presence(priv->dev);
if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
(old_index == priv->pkey_index))
return 1;
return 0;
}
/*
* returns true if the device address of the ipoib interface has changed and the
* new address is a valid one (i.e in the gid table), return false otherwise.
*/
static bool ipoib_dev_addr_changed_valid(struct ipoib_dev_priv *priv)
{
union ib_gid search_gid;
union ib_gid gid0;
int err;
u16 index;
u32 port;
bool ret = false;
if (rdma_query_gid(priv->ca, priv->port, 0, &gid0))
return false;
netif_addr_lock_bh(priv->dev);
/* The subnet prefix may have changed, update it now so we won't have
* to do it later
*/
priv->local_gid.global.subnet_prefix = gid0.global.subnet_prefix;
dev_addr_mod(priv->dev, 4, (u8 *)&gid0.global.subnet_prefix,
sizeof(gid0.global.subnet_prefix));
search_gid.global.subnet_prefix = gid0.global.subnet_prefix;
search_gid.global.interface_id = priv->local_gid.global.interface_id;
netif_addr_unlock_bh(priv->dev);
err = ib_find_gid(priv->ca, &search_gid, &port, &index);
netif_addr_lock_bh(priv->dev);
if (search_gid.global.interface_id !=
priv->local_gid.global.interface_id)
/* There was a change while we were looking up the gid, bail
* here and let the next work sort this out
*/
goto out;
/* The next section of code needs some background:
* Per IB spec the port GUID can't change if the HCA is powered on.
* port GUID is the basis for GID at index 0 which is the basis for
* the default device address of a ipoib interface.
*
* so it seems the flow should be:
* if user_changed_dev_addr && gid in gid tbl
* set bit dev_addr_set
* return true
* else
* return false
*
* The issue is that there are devices that don't follow the spec,
* they change the port GUID when the HCA is powered, so in order
* not to break userspace applications, We need to check if the
* user wanted to control the device address and we assume that
* if he sets the device address back to be based on GID index 0,
* he no longer wishs to control it.
*
* If the user doesn't control the the device address,
* IPOIB_FLAG_DEV_ADDR_SET is set and ib_find_gid failed it means
* the port GUID has changed and GID at index 0 has changed
* so we need to change priv->local_gid and priv->dev->dev_addr
* to reflect the new GID.
*/
if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
if (!err && port == priv->port) {
set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
if (index == 0)
clear_bit(IPOIB_FLAG_DEV_ADDR_CTRL,
&priv->flags);
else
set_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags);
ret = true;
} else {
ret = false;
}
} else {
if (!err && port == priv->port) {
ret = true;
} else {
if (!test_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags)) {
memcpy(&priv->local_gid, &gid0,
sizeof(priv->local_gid));
dev_addr_mod(priv->dev, 4, (u8 *)&gid0,
sizeof(priv->local_gid));
ret = true;
}
}
}
out:
netif_addr_unlock_bh(priv->dev);
return ret;
}
static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
enum ipoib_flush_level level,
int nesting)
{
struct ipoib_dev_priv *cpriv;
struct net_device *dev = priv->dev;
int result;
down_read_nested(&priv->vlan_rwsem, nesting);
/*
* Flush any child interfaces too -- they might be up even if
* the parent is down.
*/
list_for_each_entry(cpriv, &priv->child_intfs, list)
__ipoib_ib_dev_flush(cpriv, level, nesting + 1);
up_read(&priv->vlan_rwsem);
if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) &&
level != IPOIB_FLUSH_HEAVY) {
/* Make sure the dev_addr is set even if not flushing */
if (level == IPOIB_FLUSH_LIGHT)
ipoib_dev_addr_changed_valid(priv);
ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
return;
}
if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
/* interface is down. update pkey and leave. */
if (level == IPOIB_FLUSH_HEAVY) {
if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
update_parent_pkey(priv);
else
update_child_pkey(priv);
} else if (level == IPOIB_FLUSH_LIGHT)
ipoib_dev_addr_changed_valid(priv);
ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
return;
}
if (level == IPOIB_FLUSH_HEAVY) {
/* child devices chase their origin pkey value, while non-child
* (parent) devices should always takes what present in pkey index 0
*/
if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
result = update_child_pkey(priv);
if (result) {
/* restart QP only if P_Key index is changed */
ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
return;
}
} else {
result = update_parent_pkey(priv);
/* restart QP only if P_Key value changed */
if (result) {
ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n");
return;
}
}
}
if (level == IPOIB_FLUSH_LIGHT) {
int oper_up;
ipoib_mark_paths_invalid(dev);
/* Set IPoIB operation as down to prevent races between:
* the flush flow which leaves MCG and on the fly joins
* which can happen during that time. mcast restart task
* should deal with join requests we missed.
*/
oper_up = test_and_clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
ipoib_mcast_dev_flush(dev);
if (oper_up)
set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
ipoib_reap_dead_ahs(priv);
}
if (level >= IPOIB_FLUSH_NORMAL)
ipoib_ib_dev_down(dev);
if (level == IPOIB_FLUSH_HEAVY) {
if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
ipoib_ib_dev_stop(dev);
if (ipoib_ib_dev_open(dev))
return;
if (netif_queue_stopped(dev))
netif_start_queue(dev);
}
/*
* The device could have been brought down between the start and when
* we get here, don't bring it back up if it's not configured up
*/
if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
if (level >= IPOIB_FLUSH_NORMAL)
ipoib_ib_dev_up(dev);
if (ipoib_dev_addr_changed_valid(priv))
ipoib_mcast_restart_task(&priv->restart_task);
}
}
void ipoib_ib_dev_flush_light(struct work_struct *work)
{
struct ipoib_dev_priv *priv =
container_of(work, struct ipoib_dev_priv, flush_light);
__ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0);
}
void ipoib_ib_dev_flush_normal(struct work_struct *work)
{
struct ipoib_dev_priv *priv =
container_of(work, struct ipoib_dev_priv, flush_normal);
__ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0);
}
void ipoib_ib_dev_flush_heavy(struct work_struct *work)
{
struct ipoib_dev_priv *priv =
container_of(work, struct ipoib_dev_priv, flush_heavy);
rtnl_lock();
__ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0);
rtnl_unlock();
}
void ipoib_ib_dev_cleanup(struct net_device *dev)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
ipoib_dbg(priv, "cleaning up ib_dev\n");
/*
* We must make sure there are no more (path) completions
* that may wish to touch priv fields that are no longer valid
*/
ipoib_flush_paths(dev);
ipoib_mcast_stop_thread(dev);
ipoib_mcast_dev_flush(dev);
/*
* All of our ah references aren't free until after
* ipoib_mcast_dev_flush(), ipoib_flush_paths, and
* the neighbor garbage collection is stopped and reaped.
* That should all be done now, so make a final ah flush.
*/
ipoib_reap_dead_ahs(priv);
clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
priv->rn_ops->ndo_uninit(dev);
if (priv->pd) {
ib_dealloc_pd(priv->pd);
priv->pd = NULL;
}
}