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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

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Conflicts:
	drivers/net/xen-netback/netback.c

A bug fix overlapped with changing how the netback SKB control
block is implemented.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2014-03-31 16:56:43 -04:00
parent ce22bb6122 17e84a9253
commit 0b70195e0c
2 changed files with 30 additions and 4 deletions
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32
drivers/net/xen-netback/netback.c
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@@ -191,8 +191,8 @@ static bool start_new_rx_buffer(int offset, unsigned long size, int head)
* into multiple copies tend to give large frags their
* own buffers as before.
*/
if ((offset + size > MAX_BUFFER_OFFSET) &&
(size <= MAX_BUFFER_OFFSET) && offset && !head)
BUG_ON(size > MAX_BUFFER_OFFSET);
if ((offset + size > MAX_BUFFER_OFFSET) && offset && !head)
return true;
return false;
@@ -511,6 +511,8 @@ static void xenvif_rx_action(struct xenvif *vif)
while ((skb = skb_dequeue(&vif->rx_queue)) != NULL) {
RING_IDX max_slots_needed;
RING_IDX old_req_cons;
RING_IDX ring_slots_used;
int i;
/* We need a cheap worse case estimate for the number of
@@ -522,9 +524,28 @@ static void xenvif_rx_action(struct xenvif *vif)
PAGE_SIZE);
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
unsigned int size;
unsigned int offset;
size = skb_frag_size(&skb_shinfo(skb)->frags[i]);
max_slots_needed += DIV_ROUND_UP(size, PAGE_SIZE);
offset = skb_shinfo(skb)->frags[i].page_offset;
/* For a worse-case estimate we need to factor in
* the fragment page offset as this will affect the
* number of times xenvif_gop_frag_copy() will
* call start_new_rx_buffer().
*/
max_slots_needed += DIV_ROUND_UP(offset + size,
PAGE_SIZE);
}
/* To avoid the estimate becoming too pessimal for some
* frontends that limit posted rx requests, cap the estimate
* at MAX_SKB_FRAGS.
*/
if (max_slots_needed > MAX_SKB_FRAGS)
max_slots_needed = MAX_SKB_FRAGS;
/* We may need one more slot for GSO metadata */
if (skb_is_gso(skb) &&
(skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4 ||
skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6))
@@ -539,8 +560,11 @@ static void xenvif_rx_action(struct xenvif *vif)
} else
vif->rx_last_skb_slots = 0;
old_req_cons = vif->rx.req_cons;
XENVIF_RX_CB(skb)->meta_slots_used = xenvif_gop_skb(skb, &npo);
BUG_ON(XENVIF_RX_CB(skb)->meta_slots_used > max_slots_needed);
ring_slots_used = vif->rx.req_cons - old_req_cons;
BUG_ON(ring_slots_used > max_slots_needed);
__skb_queue_tail(&rxq, skb);
}