/*
* Copyright (c) 2006 Mellanox Technologies. 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.
*
* $Id$
*/
#include <rdma/ib_cm.h>
#include <rdma/ib_cache.h>
#include <net/dst.h>
#include <net/icmp.h>
#include <linux/icmpv6.h>
#include <linux/delay.h>
#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
static int data_debug_level;
module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
MODULE_PARM_DESC(cm_data_debug_level,
"Enable data path debug tracing for connected mode if > 0");
#endif
#include "ipoib.h"
#define IPOIB_CM_IETF_ID 0x1000000000000000ULL
#define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
#define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ)
#define IPOIB_CM_RX_DELAY (3 * 256 * HZ)
#define IPOIB_CM_RX_UPDATE_MASK (0x3)
static struct ib_qp_attr ipoib_cm_err_attr = {
.qp_state = IB_QPS_ERR
};
#define IPOIB_CM_RX_DRAIN_WRID 0x7fffffff
static struct ib_send_wr ipoib_cm_rx_drain_wr = {
.wr_id = IPOIB_CM_RX_DRAIN_WRID,
.opcode = IB_WR_SEND,
};
static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
struct ib_cm_event *event);
static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
u64 mapping[IPOIB_CM_RX_SG])
{
int i;
ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
for (i = 0; i < frags; ++i)
ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
}
static int ipoib_cm_post_receive(struct net_device *dev, int id)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ib_recv_wr *bad_wr;
int i, ret;
priv->cm.rx_wr.wr_id = id | IPOIB_CM_OP_SRQ;
for (i = 0; i < IPOIB_CM_RX_SG; ++i)
priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
if (unlikely(ret)) {
ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
priv->cm.srq_ring[id].mapping);
dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
priv->cm.srq_ring[id].skb = NULL;
}
return ret;
}
static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, int id, int frags,
u64 mapping[IPOIB_CM_RX_SG])
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct sk_buff *skb;
int i;
skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
if (unlikely(!skb))
return NULL;
/*
* IPoIB adds a 4 byte header. So we need 12 more bytes to align the
* IP header to a multiple of 16.
*/
skb_reserve(skb, 12);
mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
DMA_FROM_DEVICE);
if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
dev_kfree_skb_any(skb);
return NULL;
}
for (i = 0; i < frags; i++) {
struct page *page = alloc_page(GFP_ATOMIC);
if (!page)
goto partial_error;
skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page,
0, PAGE_SIZE, DMA_FROM_DEVICE);
if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
goto partial_error;
}
priv->cm.srq_ring[id].skb = skb;
return skb;
partial_error:
ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
for (; i >= 0; --i)
ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
dev_kfree_skb_any(skb);
return NULL;
}
static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv* priv)
{
struct ib_send_wr *bad_wr;
struct ipoib_cm_rx *p;
/* We only reserved 1 extra slot in CQ for drain WRs, so
* make sure we have at most 1 outstanding WR. */
if (list_empty(&priv->cm.rx_flush_list) ||
!list_empty(&priv->cm.rx_drain_list))
return;
/*
* QPs on flush list are error state. This way, a "flush
* error" WC will be immediately generated for each WR we post.
*/
p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
ipoib_warn(priv, "failed to post drain wr\n");
list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
}
static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
{
struct ipoib_cm_rx *p = ctx;
struct ipoib_dev_priv *priv = netdev_priv(p->dev);
unsigned long flags;
if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
return;
spin_lock_irqsave(&priv->lock, flags);
list_move(&p->list, &priv->cm.rx_flush_list);
p->state = IPOIB_CM_RX_FLUSH;
ipoib_cm_start_rx_drain(priv);
spin_unlock_irqrestore(&priv->lock, flags);
}
static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
struct ipoib_cm_rx *p)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ib_qp_init_attr attr = {
.event_handler = ipoib_cm_rx_event_handler,
.send_cq = priv->cq, /* For drain WR */
.recv_cq = priv->cq,
.srq = priv->cm.srq,
.cap.max_send_wr = 1, /* For drain WR */
.cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
.sq_sig_type = IB_SIGNAL_ALL_WR,
.qp_type = IB_QPT_RC,
.qp_context = p,
};
return ib_create_qp(priv->pd, &attr);
}
static int ipoib_cm_modify_rx_qp(struct net_device *dev,
struct ib_cm_id *cm_id, struct ib_qp *qp,
unsigned psn)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ib_qp_attr qp_attr;
int qp_attr_mask, ret;
qp_attr.qp_state = IB_QPS_INIT;
ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
if (ret) {
ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
return ret;
}
ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
if (ret) {
ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
return ret;
}
qp_attr.qp_state = IB_QPS_RTR;
ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
if (ret) {
ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
return ret;
}
qp_attr.rq_psn = psn;
ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
if (ret) {
ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
return ret;
}
/*
* Current Mellanox HCA firmware won't generate completions
* with error for drain WRs unless the QP has been moved to
* RTS first. This work-around leaves a window where a QP has
* moved to error asynchronously, but this will eventually get
* fixed in firmware, so let's not error out if modify QP
* fails.
*/
qp_attr.qp_state = IB_QPS_RTS;
ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
if (ret) {
ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
return 0;
}
ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
if (ret) {
ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
return 0;
}
return 0;
}
static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
struct ib_qp *qp, struct ib_cm_req_event_param *req,
unsigned psn)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_cm_data data = {};
struct ib_cm_rep_param rep = {};
data.qpn = cpu_to_be32(priv->qp->qp_num);
data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
rep.private_data = &data;
rep.private_data_len = sizeof data;
rep.flow_control = 0;
rep.rnr_retry_count = req->rnr_retry_count;
rep.target_ack_delay = 20; /* FIXME */
rep.srq = 1;
rep.qp_num = qp->qp_num;
rep.starting_psn = psn;
return ib_send_cm_rep(cm_id, &rep);
}
static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
{
struct net_device *dev = cm_id->context;
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_cm_rx *p;
unsigned psn;
int ret;
ipoib_dbg(priv, "REQ arrived\n");
p = kzalloc(sizeof *p, GFP_KERNEL);
if (!p)
return -ENOMEM;
p->dev = dev;
p->id = cm_id;
cm_id->context = p;
p->state = IPOIB_CM_RX_LIVE;
p->jiffies = jiffies;
INIT_LIST_HEAD(&p->list);
p->qp = ipoib_cm_create_rx_qp(dev, p);
if (IS_ERR(p->qp)) {
ret = PTR_ERR(p->qp);
goto err_qp;
}
psn = random32() & 0xffffff;
ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
if (ret)
goto err_modify;
spin_lock_irq(&priv->lock);
queue_delayed_work(ipoib_workqueue,
&priv->cm.stale_task, IPOIB_CM_RX_DELAY);
/* Add this entry to passive ids list head, but do not re-add it
* if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
p->jiffies = jiffies;
if (p->state == IPOIB_CM_RX_LIVE)
list_move(&p->list, &priv->cm.passive_ids);
spin_unlock_irq(&priv->lock);
ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
if (ret) {
ipoib_warn(priv, "failed to send REP: %d\n", ret);
if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
ipoib_warn(priv, "unable to move qp to error state\n");
}
return 0;
err_modify:
ib_destroy_qp(p->qp);
err_qp:
kfree(p);
return ret;
}
static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
struct ib_cm_event *event)
{
struct ipoib_cm_rx *p;
struct ipoib_dev_priv *priv;
switch (event->event) {
case IB_CM_REQ_RECEIVED:
return ipoib_cm_req_handler(cm_id, event);
case IB_CM_DREQ_RECEIVED:
p = cm_id->context;
ib_send_cm_drep(cm_id, NULL, 0);
/* Fall through */
case IB_CM_REJ_RECEIVED:
p = cm_id->context;
priv = netdev_priv(p->dev);
if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
ipoib_warn(priv, "unable to move qp to error state\n");
/* Fall through */
default:
return 0;
}
}
/* Adjust length of skb with fragments to match received data */
static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
unsigned int length, struct sk_buff *toskb)
{
int i, num_frags;
unsigned int size;
/* put header into skb */
size = min(length, hdr_space);
skb->tail += size;
skb->len += size;
length -= size;
num_frags = skb_shinfo(skb)->nr_frags;
for (i = 0; i < num_frags; i++) {
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
if (length == 0) {
/* don't need this page */
skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE);
--skb_shinfo(skb)->nr_frags;
} else {
size = min(length, (unsigned) PAGE_SIZE);
frag->size = size;
skb->data_len += size;
skb->truesize += size;
skb->len += size;
length -= size;
}
}
}
void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
unsigned int wr_id = wc->wr_id & ~IPOIB_CM_OP_SRQ;
struct sk_buff *skb, *newskb;
struct ipoib_cm_rx *p;
unsigned long flags;
u64 mapping[IPOIB_CM_RX_SG];
int frags;
ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
wr_id, wc->status);
if (unlikely(wr_id >= ipoib_recvq_size)) {
if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~IPOIB_CM_OP_SRQ)) {
spin_lock_irqsave(&priv->lock, flags);
list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
ipoib_cm_start_rx_drain(priv);
queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
spin_unlock_irqrestore(&priv->lock, flags);
} else
ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
wr_id, ipoib_recvq_size);
return;
}
skb = priv->cm.srq_ring[wr_id].skb;
if (unlikely(wc->status != IB_WC_SUCCESS)) {
ipoib_dbg(priv, "cm recv error "
"(status=%d, wrid=%d vend_err %x)\n",
wc->status, wr_id, wc->vendor_err);
++priv->stats.rx_dropped;
goto repost;
}
if (!likely(wr_id & IPOIB_CM_RX_UPDATE_MASK)) {
p = wc->qp->qp_context;
if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
spin_lock_irqsave(&priv->lock, flags);
p->jiffies = jiffies;
/* Move this entry to list head, but do not re-add it
* if it has been moved out of list. */
if (p->state == IPOIB_CM_RX_LIVE)
list_move(&p->list, &priv->cm.passive_ids);
spin_unlock_irqrestore(&priv->lock, flags);
}
}
frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
(unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
newskb = ipoib_cm_alloc_rx_skb(dev, wr_id, frags, mapping);
if (unlikely(!newskb)) {
/*
* If we can't allocate a new RX buffer, dump
* this packet and reuse the old buffer.
*/
ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
++priv->stats.rx_dropped;
goto repost;
}
ipoib_cm_dma_unmap_rx(priv, frags, priv->cm.srq_ring[wr_id].mapping);
memcpy(priv->cm.srq_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
wc->byte_len, wc->slid);
skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
skb->protocol = ((struct ipoib_header *) skb->data)->proto;
skb_reset_mac_header(skb);
skb_pull(skb, IPOIB_ENCAP_LEN);
dev->last_rx = jiffies;
++priv->stats.rx_packets;
priv->stats.rx_bytes += skb->len;
skb->dev = dev;
/* XXX get correct PACKET_ type here */
skb->pkt_type = PACKET_HOST;
netif_receive_skb(skb);
repost:
if (unlikely(ipoib_cm_post_receive(dev, wr_id)))
ipoib_warn(priv, "ipoib_cm_post_receive failed "
"for buf %d\n", wr_id);
}
static inline int post_send(struct ipoib_dev_priv *priv,
struct ipoib_cm_tx *tx,
unsigned int wr_id,
u64 addr, int len)
{
struct ib_send_wr *bad_wr;
priv->tx_sge.addr = addr;
priv->tx_sge.length = len;
priv->tx_wr.wr_id = wr_id;
return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
}
void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_tx_buf *tx_req;
u64 addr;
if (unlikely(skb->len > tx->mtu)) {
ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
skb->len, tx->mtu);
++priv->stats.tx_dropped;
++priv->stats.tx_errors;
ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
return;
}
ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
tx->tx_head, skb->len, tx->qp->qp_num);
/*
* 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 = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
tx_req->skb = skb;
addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
++priv->stats.tx_errors;
dev_kfree_skb_any(skb);
return;
}
tx_req->mapping = addr;
if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
addr, skb->len))) {
ipoib_warn(priv, "post_send failed\n");
++priv->stats.tx_errors;
ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
dev_kfree_skb_any(skb);
} else {
dev->trans_start = jiffies;
++tx->tx_head;
if (tx->tx_head - tx->tx_tail == ipoib_sendq_size) {
ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
tx->qp->qp_num);
netif_stop_queue(dev);
set_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags);
}
}
}
static void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ipoib_cm_tx *tx,
struct ib_wc *wc)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
unsigned int wr_id = wc->wr_id;
struct ipoib_tx_buf *tx_req;
unsigned long flags;
ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
wr_id, wc->status);
if (unlikely(wr_id >= ipoib_sendq_size)) {
ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
wr_id, ipoib_sendq_size);
return;
}
tx_req = &tx->tx_ring[wr_id];
ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
/* FIXME: is this right? Shouldn't we only increment on success? */
++priv->stats.tx_packets;
priv->stats.tx_bytes += tx_req->skb->len;
dev_kfree_skb_any(tx_req->skb);
spin_lock_irqsave(&priv->tx_lock, flags);
++tx->tx_tail;
if (unlikely(test_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags)) &&
tx->tx_head - tx->tx_tail <= ipoib_sendq_size >> 1) {
clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags);
netif_wake_queue(dev);
}
if (wc->status != IB_WC_SUCCESS &&
wc->status != IB_WC_WR_FLUSH_ERR) {
struct ipoib_neigh *neigh;
ipoib_dbg(priv, "failed cm send event "
"(status=%d, wrid=%d vend_err %x)\n",
wc->status, wr_id, wc->vendor_err);
spin_lock(&priv->lock);
neigh = tx->neigh;
if (neigh) {
neigh->cm = NULL;
list_del(&neigh->list);
if (neigh->ah)
ipoib_put_ah(neigh->ah);
ipoib_neigh_free(dev, neigh);
tx->neigh = NULL;
}
/* queue would be re-started anyway when TX is destroyed,
* but it makes sense to do it ASAP here. */
if (test_and_clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags))
netif_wake_queue(dev);
if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
list_move(&tx->list, &priv->cm.reap_list);
queue_work(ipoib_workqueue, &priv->cm.reap_task);
}
clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
spin_unlock(&priv->lock);
}
spin_unlock_irqrestore(&priv->tx_lock, flags);
}
static void ipoib_cm_tx_completion(struct ib_cq *cq, void *tx_ptr)
{
struct ipoib_cm_tx *tx = tx_ptr;
int n, i;
ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
do {
n = ib_poll_cq(cq, IPOIB_NUM_WC, tx->ibwc);
for (i = 0; i < n; ++i)
ipoib_cm_handle_tx_wc(tx->dev, tx, tx->ibwc + i);
} while (n == IPOIB_NUM_WC);
}
int ipoib_cm_dev_open(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
int ret;
if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
return 0;
priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
if (IS_ERR(priv->cm.id)) {
printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
ret = PTR_ERR(priv->cm.id);
goto err_cm;
}
ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
0, NULL);
if (ret) {
printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
IPOIB_CM_IETF_ID | priv->qp->qp_num);
goto err_listen;
}
return 0;
err_listen:
ib_destroy_cm_id(priv->cm.id);
err_cm:
priv->cm.id = NULL;
return ret;
}
void ipoib_cm_dev_stop(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_cm_rx *p, *n;
unsigned long begin;
LIST_HEAD(list);
int ret;
if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
return;
ib_destroy_cm_id(priv->cm.id);
priv->cm.id = NULL;
spin_lock_irq(&priv->lock);
while (!list_empty(&priv->cm.passive_ids)) {
p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
list_move(&p->list, &priv->cm.rx_error_list);
p->state = IPOIB_CM_RX_ERROR;
spin_unlock_irq(&priv->lock);
ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
if (ret)
ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
spin_lock_irq(&priv->lock);
}
/* Wait for all RX to be drained */
begin = jiffies;
while (!list_empty(&priv->cm.rx_error_list) ||
!list_empty(&priv->cm.rx_flush_list) ||
!list_empty(&priv->cm.rx_drain_list)) {
if (time_after(jiffies, begin + 5 * HZ)) {
ipoib_warn(priv, "RX drain timing out\n");
/*
* assume the HW is wedged and just free up everything.
*/
list_splice_init(&priv->cm.rx_flush_list, &list);
list_splice_init(&priv->cm.rx_error_list, &list);
list_splice_init(&priv->cm.rx_drain_list, &list);
break;
}
spin_unlock_irq(&priv->lock);
msleep(1);
ipoib_drain_cq(dev);
spin_lock_irq(&priv->lock);
}
list_splice_init(&priv->cm.rx_reap_list, &list);
spin_unlock_irq(&priv->lock);
list_for_each_entry_safe(p, n, &list, list) {
ib_destroy_cm_id(p->id);
ib_destroy_qp(p->qp);
kfree(p);
}
cancel_delayed_work(&priv->cm.stale_task);
}
static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
{
struct ipoib_cm_tx *p = cm_id->context;
struct ipoib_dev_priv *priv = netdev_priv(p->dev);
struct ipoib_cm_data *data = event->private_data;
struct sk_buff_head skqueue;
struct ib_qp_attr qp_attr;
int qp_attr_mask, ret;
struct sk_buff *skb;
p->mtu = be32_to_cpu(data->mtu);
if (p->mtu <= IPOIB_ENCAP_LEN) {
ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
p->mtu, IPOIB_ENCAP_LEN);
return -EINVAL;
}
qp_attr.qp_state = IB_QPS_RTR;
ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
if (ret) {
ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
return ret;
}
qp_attr.rq_psn = 0 /* FIXME */;
ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
if (ret) {
ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
return ret;
}
qp_attr.qp_state = IB_QPS_RTS;
ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
if (ret) {
ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
return ret;
}
ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
if (ret) {
ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
return ret;
}
skb_queue_head_init(&skqueue);
spin_lock_irq(&priv->lock);
set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
if (p->neigh)
while ((skb = __skb_dequeue(&p->neigh->queue)))
__skb_queue_tail(&skqueue, skb);
spin_unlock_irq(&priv->lock);
while ((skb = __skb_dequeue(&skqueue))) {
skb->dev = p->dev;
if (dev_queue_xmit(skb))
ipoib_warn(priv, "dev_queue_xmit failed "
"to requeue packet\n");
}
ret = ib_send_cm_rtu(cm_id, NULL, 0);
if (ret) {
ipoib_warn(priv, "failed to send RTU: %d\n", ret);
return ret;
}
return 0;
}
static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ib_cq *cq)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ib_qp_init_attr attr = {};
attr.recv_cq = priv->cq;
attr.srq = priv->cm.srq;
attr.cap.max_send_wr = ipoib_sendq_size;
attr.cap.max_send_sge = 1;
attr.sq_sig_type = IB_SIGNAL_ALL_WR;
attr.qp_type = IB_QPT_RC;
attr.send_cq = cq;
return ib_create_qp(priv->pd, &attr);
}
static int ipoib_cm_send_req(struct net_device *dev,
struct ib_cm_id *id, struct ib_qp *qp,
u32 qpn,
struct ib_sa_path_rec *pathrec)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_cm_data data = {};
struct ib_cm_req_param req = {};
data.qpn = cpu_to_be32(priv->qp->qp_num);
data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
req.primary_path = pathrec;
req.alternate_path = NULL;
req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
req.qp_num = qp->qp_num;
req.qp_type = qp->qp_type;
req.private_data = &data;
req.private_data_len = sizeof data;
req.flow_control = 0;
req.starting_psn = 0; /* FIXME */
/*
* Pick some arbitrary defaults here; we could make these
* module parameters if anyone cared about setting them.
*/
req.responder_resources = 4;
req.remote_cm_response_timeout = 20;
req.local_cm_response_timeout = 20;
req.retry_count = 0; /* RFC draft warns against retries */
req.rnr_retry_count = 0; /* RFC draft warns against retries */
req.max_cm_retries = 15;
req.srq = 1;
return ib_send_cm_req(id, &req);
}
static int ipoib_cm_modify_tx_init(struct net_device *dev,
struct ib_cm_id *cm_id, struct ib_qp *qp)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ib_qp_attr qp_attr;
int qp_attr_mask, ret;
ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
if (ret) {
ipoib_warn(priv, "pkey 0x%x not in cache: %d\n", priv->pkey, ret);
return ret;
}
qp_attr.qp_state = IB_QPS_INIT;
qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
qp_attr.port_num = priv->port;
qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
if (ret) {
ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
return ret;
}
return 0;
}
static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
struct ib_sa_path_rec *pathrec)
{
struct ipoib_dev_priv *priv = netdev_priv(p->dev);
int ret;
p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring,
GFP_KERNEL);
if (!p->tx_ring) {
ipoib_warn(priv, "failed to allocate tx ring\n");
ret = -ENOMEM;
goto err_tx;
}
p->cq = ib_create_cq(priv->ca, ipoib_cm_tx_completion, NULL, p,
ipoib_sendq_size + 1, 0);
if (IS_ERR(p->cq)) {
ret = PTR_ERR(p->cq);
ipoib_warn(priv, "failed to allocate tx cq: %d\n", ret);
goto err_cq;
}
ret = ib_req_notify_cq(p->cq, IB_CQ_NEXT_COMP);
if (ret) {
ipoib_warn(priv, "failed to request completion notification: %d\n", ret);
goto err_req_notify;
}
p->qp = ipoib_cm_create_tx_qp(p->dev, p->cq);
if (IS_ERR(p->qp)) {
ret = PTR_ERR(p->qp);
ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
goto err_qp;
}
p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
if (IS_ERR(p->id)) {
ret = PTR_ERR(p->id);
ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
goto err_id;
}
ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
if (ret) {
ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
goto err_modify;
}
ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
if (ret) {
ipoib_warn(priv, "failed to send cm req: %d\n", ret);
goto err_send_cm;
}
ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n",
p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn);
return 0;
err_send_cm:
err_modify:
ib_destroy_cm_id(p->id);
err_id:
p->id = NULL;
ib_destroy_qp(p->qp);
err_req_notify:
err_qp:
p->qp = NULL;
ib_destroy_cq(p->cq);
err_cq:
p->cq = NULL;
err_tx:
return ret;
}
static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
{
struct ipoib_dev_priv *priv = netdev_priv(p->dev);
struct ipoib_tx_buf *tx_req;
ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
if (p->id)
ib_destroy_cm_id(p->id);
if (p->qp)
ib_destroy_qp(p->qp);
if (p->cq)
ib_destroy_cq(p->cq);
if (test_bit(IPOIB_FLAG_NETIF_STOPPED, &p->flags))
netif_wake_queue(p->dev);
if (p->tx_ring) {
while ((int) p->tx_tail - (int) p->tx_head < 0) {
tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
DMA_TO_DEVICE);
dev_kfree_skb_any(tx_req->skb);
++p->tx_tail;
}
kfree(p->tx_ring);
}
kfree(p);
}
static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
struct ib_cm_event *event)
{
struct ipoib_cm_tx *tx = cm_id->context;
struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
struct net_device *dev = priv->dev;
struct ipoib_neigh *neigh;
int ret;
switch (event->event) {
case IB_CM_DREQ_RECEIVED:
ipoib_dbg(priv, "DREQ received.\n");
ib_send_cm_drep(cm_id, NULL, 0);
break;
case IB_CM_REP_RECEIVED:
ipoib_dbg(priv, "REP received.\n");
ret = ipoib_cm_rep_handler(cm_id, event);
if (ret)
ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
NULL, 0, NULL, 0);
break;
case IB_CM_REQ_ERROR:
case IB_CM_REJ_RECEIVED:
case IB_CM_TIMEWAIT_EXIT:
ipoib_dbg(priv, "CM error %d.\n", event->event);
spin_lock_irq(&priv->tx_lock);
spin_lock(&priv->lock);
neigh = tx->neigh;
if (neigh) {
neigh->cm = NULL;
list_del(&neigh->list);
if (neigh->ah)
ipoib_put_ah(neigh->ah);
ipoib_neigh_free(dev, neigh);
tx->neigh = NULL;
}
if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
list_move(&tx->list, &priv->cm.reap_list);
queue_work(ipoib_workqueue, &priv->cm.reap_task);
}
spin_unlock(&priv->lock);
spin_unlock_irq(&priv->tx_lock);
break;
default:
break;
}
return 0;
}
struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
struct ipoib_neigh *neigh)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_cm_tx *tx;
tx = kzalloc(sizeof *tx, GFP_ATOMIC);
if (!tx)
return NULL;
neigh->cm = tx;
tx->neigh = neigh;
tx->path = path;
tx->dev = dev;
list_add(&tx->list, &priv->cm.start_list);
set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
queue_work(ipoib_workqueue, &priv->cm.start_task);
return tx;
}
void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
{
struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
list_move(&tx->list, &priv->cm.reap_list);
queue_work(ipoib_workqueue, &priv->cm.reap_task);
ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n",
IPOIB_GID_ARG(tx->neigh->dgid));
tx->neigh = NULL;
}
}
static void ipoib_cm_tx_start(struct work_struct *work)
{
struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
cm.start_task);
struct net_device *dev = priv->dev;
struct ipoib_neigh *neigh;
struct ipoib_cm_tx *p;
unsigned long flags;
int ret;
struct ib_sa_path_rec pathrec;
u32 qpn;
spin_lock_irqsave(&priv->tx_lock, flags);
spin_lock(&priv->lock);
while (!list_empty(&priv->cm.start_list)) {
p = list_entry(priv->cm.start_list.next, typeof(*p), list);
list_del_init(&p->list);
neigh = p->neigh;
qpn = IPOIB_QPN(neigh->neighbour->ha);
memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
spin_unlock(&priv->lock);
spin_unlock_irqrestore(&priv->tx_lock, flags);
ret = ipoib_cm_tx_init(p, qpn, &pathrec);
spin_lock_irqsave(&priv->tx_lock, flags);
spin_lock(&priv->lock);
if (ret) {
neigh = p->neigh;
if (neigh) {
neigh->cm = NULL;
list_del(&neigh->list);
if (neigh->ah)
ipoib_put_ah(neigh->ah);
ipoib_neigh_free(dev, neigh);
}
list_del(&p->list);
kfree(p);
}
}
spin_unlock(&priv->lock);
spin_unlock_irqrestore(&priv->tx_lock, flags);
}
static void ipoib_cm_tx_reap(struct work_struct *work)
{
struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
cm.reap_task);
struct ipoib_cm_tx *p;
spin_lock_irq(&priv->tx_lock);
spin_lock(&priv->lock);
while (!list_empty(&priv->cm.reap_list)) {
p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
list_del(&p->list);
spin_unlock(&priv->lock);
spin_unlock_irq(&priv->tx_lock);
ipoib_cm_tx_destroy(p);
spin_lock_irq(&priv->tx_lock);
spin_lock(&priv->lock);
}
spin_unlock(&priv->lock);
spin_unlock_irq(&priv->tx_lock);
}
static void ipoib_cm_skb_reap(struct work_struct *work)
{
struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
cm.skb_task);
struct net_device *dev = priv->dev;
struct sk_buff *skb;
unsigned mtu = priv->mcast_mtu;
spin_lock_irq(&priv->tx_lock);
spin_lock(&priv->lock);
while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
spin_unlock(&priv->lock);
spin_unlock_irq(&priv->tx_lock);
if (skb->protocol == htons(ETH_P_IP))
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
else if (skb->protocol == htons(ETH_P_IPV6))
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
#endif
dev_kfree_skb_any(skb);
spin_lock_irq(&priv->tx_lock);
spin_lock(&priv->lock);
}
spin_unlock(&priv->lock);
spin_unlock_irq(&priv->tx_lock);
}
void ipoib_cm_skb_too_long(struct net_device* dev, struct sk_buff *skb,
unsigned int mtu)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
int e = skb_queue_empty(&priv->cm.skb_queue);
if (skb->dst)
skb->dst->ops->update_pmtu(skb->dst, mtu);
skb_queue_tail(&priv->cm.skb_queue, skb);
if (e)
queue_work(ipoib_workqueue, &priv->cm.skb_task);
}
static void ipoib_cm_rx_reap(struct work_struct *work)
{
struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
cm.rx_reap_task);
struct ipoib_cm_rx *p, *n;
LIST_HEAD(list);
spin_lock_irq(&priv->lock);
list_splice_init(&priv->cm.rx_reap_list, &list);
spin_unlock_irq(&priv->lock);
list_for_each_entry_safe(p, n, &list, list) {
ib_destroy_cm_id(p->id);
ib_destroy_qp(p->qp);
kfree(p);
}
}
static void ipoib_cm_stale_task(struct work_struct *work)
{
struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
cm.stale_task.work);
struct ipoib_cm_rx *p;
int ret;
spin_lock_irq(&priv->lock);
while (!list_empty(&priv->cm.passive_ids)) {
/* List is sorted by LRU, start from tail,
* stop when we see a recently used entry */
p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
break;
list_move(&p->list, &priv->cm.rx_error_list);
p->state = IPOIB_CM_RX_ERROR;
spin_unlock_irq(&priv->lock);
ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
if (ret)
ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
spin_lock_irq(&priv->lock);
}
if (!list_empty(&priv->cm.passive_ids))
queue_delayed_work(ipoib_workqueue,
&priv->cm.stale_task, IPOIB_CM_RX_DELAY);
spin_unlock_irq(&priv->lock);
}
static ssize_t show_mode(struct device *d, struct device_attribute *attr,
char *buf)
{
struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
return sprintf(buf, "connected\n");
else
return sprintf(buf, "datagram\n");
}
static ssize_t set_mode(struct device *d, struct device_attribute *attr,
const char *buf, size_t count)
{
struct net_device *dev = to_net_dev(d);
struct ipoib_dev_priv *priv = netdev_priv(dev);
/* flush paths if we switch modes so that connections are restarted */
if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
ipoib_warn(priv, "enabling connected mode "
"will cause multicast packet drops\n");
ipoib_flush_paths(dev);
return count;
}
if (!strcmp(buf, "datagram\n")) {
clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
dev->mtu = min(priv->mcast_mtu, dev->mtu);
ipoib_flush_paths(dev);
return count;
}
return -EINVAL;
}
static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
int ipoib_cm_add_mode_attr(struct net_device *dev)
{
return device_create_file(&dev->dev, &dev_attr_mode);
}
int ipoib_cm_dev_init(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ib_srq_init_attr srq_init_attr = {
.attr = {
.max_wr = ipoib_recvq_size,
.max_sge = IPOIB_CM_RX_SG
}
};
int ret, i;
INIT_LIST_HEAD(&priv->cm.passive_ids);
INIT_LIST_HEAD(&priv->cm.reap_list);
INIT_LIST_HEAD(&priv->cm.start_list);
INIT_LIST_HEAD(&priv->cm.rx_error_list);
INIT_LIST_HEAD(&priv->cm.rx_flush_list);
INIT_LIST_HEAD(&priv->cm.rx_drain_list);
INIT_LIST_HEAD(&priv->cm.rx_reap_list);
INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
skb_queue_head_init(&priv->cm.skb_queue);
priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
if (IS_ERR(priv->cm.srq)) {
ret = PTR_ERR(priv->cm.srq);
priv->cm.srq = NULL;
return ret;
}
priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring,
GFP_KERNEL);
if (!priv->cm.srq_ring) {
printk(KERN_WARNING "%s: failed to allocate CM ring (%d entries)\n",
priv->ca->name, ipoib_recvq_size);
ipoib_cm_dev_cleanup(dev);
return -ENOMEM;
}
for (i = 0; i < IPOIB_CM_RX_SG; ++i)
priv->cm.rx_sge[i].lkey = priv->mr->lkey;
priv->cm.rx_sge[0].length = IPOIB_CM_HEAD_SIZE;
for (i = 1; i < IPOIB_CM_RX_SG; ++i)
priv->cm.rx_sge[i].length = PAGE_SIZE;
priv->cm.rx_wr.next = NULL;
priv->cm.rx_wr.sg_list = priv->cm.rx_sge;
priv->cm.rx_wr.num_sge = IPOIB_CM_RX_SG;
for (i = 0; i < ipoib_recvq_size; ++i) {
if (!ipoib_cm_alloc_rx_skb(dev, i, IPOIB_CM_RX_SG - 1,
priv->cm.srq_ring[i].mapping)) {
ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
ipoib_cm_dev_cleanup(dev);
return -ENOMEM;
}
if (ipoib_cm_post_receive(dev, i)) {
ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
ipoib_cm_dev_cleanup(dev);
return -EIO;
}
}
priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
return 0;
}
void ipoib_cm_dev_cleanup(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
int i, ret;
if (!priv->cm.srq)
return;
ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
ret = ib_destroy_srq(priv->cm.srq);
if (ret)
ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
priv->cm.srq = NULL;
if (!priv->cm.srq_ring)
return;
for (i = 0; i < ipoib_recvq_size; ++i)
if (priv->cm.srq_ring[i].skb) {
ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
priv->cm.srq_ring[i].mapping);
dev_kfree_skb_any(priv->cm.srq_ring[i].skb);
priv->cm.srq_ring[i].skb = NULL;
}
kfree(priv->cm.srq_ring);
priv->cm.srq_ring = NULL;
}
