diff options
| author |   Stephen Hemminger <shemminger@osdl.org> | 2006-12-01 16:36:22 -0800 |
|---|---|---|
| committer |   Jeff Garzik <jeff@garzik.org> | 2006-12-02 00:24:50 -0500 |
| commit | cabdfb373ae74036225826ce260c16a8e260eb0b (patch) | |
| tree | 3e0f126e924fd6ec95b9339ba4889fb668eb8e87 /drivers/net/chelsio/sge.c | |
| parent | [PATCH] chelsio: statistics improvement (diff) | |
| download | linux-dev-cabdfb373ae74036225826ce260c16a8e260eb0b.tar.xz linux-dev-cabdfb373ae74036225826ce260c16a8e260eb0b.zip | |
[PATCH] chelesio: transmit locking (plus bug fix).
If transmit lock is contended on, then push return code back
and retry at higher level.
Bugfix: If buffer is reallocated because of lack of headroom
and the send is blocked, then drop packet. This is necessary
because caller would end up requeuing a freed skb.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/net/chelsio/sge.c')
| -rw-r--r-- | drivers/net/chelsio/sge.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/drivers/net/chelsio/sge.c b/drivers/net/chelsio/sge.c index 9911048d8213..0ca8d876e16f 100644 --- a/drivers/net/chelsio/sge.c +++ b/drivers/net/chelsio/sge.c @@ -1778,7 +1778,9 @@ static int t1_sge_tx(struct sk_buff *skb, struct adapter *adapter, struct cmdQ *q = &sge->cmdQ[qid]; unsigned int credits, pidx, genbit, count, use_sched_skb = 0; - spin_lock(&q->lock); + if (!spin_trylock(&q->lock)) + return NETDEV_TX_LOCKED; + reclaim_completed_tx(sge, q); pidx = q->pidx; @@ -1887,6 +1889,8 @@ int t1_start_xmit(struct sk_buff *skb, struct net_device *dev) struct sge *sge = adapter->sge; struct sge_port_stats *st = per_cpu_ptr(sge->port_stats[dev->if_port], smp_processor_id()); struct cpl_tx_pkt *cpl; + struct sk_buff *orig_skb = skb; + int ret; if (skb->protocol == htons(ETH_P_CPL5)) goto send; @@ -1930,8 +1934,6 @@ int t1_start_xmit(struct sk_buff *skb, struct net_device *dev) * Complain when this happens but try to fix things up. */ if (unlikely(skb_headroom(skb) < dev->hard_header_len - ETH_HLEN)) { - struct sk_buff *orig_skb = skb; - pr_debug("%s: headroom %d header_len %d\n", dev->name, skb_headroom(skb), dev->hard_header_len); @@ -1991,7 +1993,16 @@ int t1_start_xmit(struct sk_buff *skb, struct net_device *dev) send: st->tx_packets++; dev->trans_start = jiffies; - return t1_sge_tx(skb, adapter, 0, dev); + ret = t1_sge_tx(skb, adapter, 0, dev); + + /* If transmit busy, and we reallocated skb's due to headroom limit, + * then silently discard to avoid leak. + */ + if (unlikely(ret != NETDEV_TX_OK && skb != orig_skb)) { + dev_kfree_skb_any(skb); + ret = NETDEV_TX_OK; + } + return ret; } /* |