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net: Move main gso loop out of dev_hard_start_xmit() into helper.

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There is a slight policy change happening here as well.

The previous code would drop the entire rest of the GSO skb if any of
them got, for example, a congestion notification.

That makes no sense, anything NET_XMIT_MASK and below is something
like congestion or policing.  And in the congestion case it doesn't
even mean the packet was actually dropped.

Just continue until dev_xmit_complete() evaluates to false.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2014-08-29 21:19:14 -07:00
parent 2ea2551375
commit 7f2e870f2a
1 changed files with 29 additions and 19 deletions
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48
net/core/dev.c
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@ -2616,6 +2616,34 @@ static int xmit_one(struct sk_buff *skb, struct net_device *dev,
return rc; return rc;
} }
static struct sk_buff *xmit_list(struct sk_buff *first, struct net_device *dev,
struct netdev_queue *txq, int *ret)
{
struct sk_buff *skb = first;
int rc = NETDEV_TX_OK;
while (skb) {
struct sk_buff *next = skb->next;
skb->next = NULL;
rc = xmit_one(skb, dev, txq);
if (unlikely(!dev_xmit_complete(rc))) {
skb->next = next;
goto out;
}
skb = next;
if (netif_xmit_stopped(txq) && skb) {
rc = NETDEV_TX_BUSY;
break;
}
}
out:
*ret = rc;
return skb;
}
int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
struct netdev_queue *txq) struct netdev_queue *txq)
{ {
@ -2681,25 +2709,7 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
} }
gso: gso:
do { skb->next = xmit_list(skb->next, dev, txq, &rc);
struct sk_buff *nskb = skb->next;
skb->next = nskb->next;
nskb->next = NULL;
rc = xmit_one(nskb, dev, txq);
if (unlikely(rc != NETDEV_TX_OK)) {
if (rc & ~NETDEV_TX_MASK)
goto out_kfree_gso_skb;
nskb->next = skb->next;
skb->next = nskb;
return rc;
}
if (unlikely(netif_xmit_stopped(txq) && skb->next))
return NETDEV_TX_BUSY;
} while (skb->next);
out_kfree_gso_skb:
if (likely(skb->next == NULL)) { if (likely(skb->next == NULL)) {
skb->destructor = DEV_GSO_CB(skb)->destructor; skb->destructor = DEV_GSO_CB(skb)->destructor;
consume_skb(skb); consume_skb(skb);