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Fix a bug in mxge's LRO which can cause dup acks to

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get aggregated & hence prevent TCP from entering
fast retransmit.

Pointed out by: jeff
Reviewed by: gnn
MFC after:	7 days
This commit is contained in:
gallatin 2011-04-07 13:49:44 +00:00
parent d582d39710
commit 5754f4c1c2
1 changed files with 4 additions and 2 deletions
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6
sys/dev/mxge/mxge_lro.c
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@ -237,8 +237,10 @@ mxge_lro_rx(struct mxge_slice_state *ss, struct mbuf *m_head, uint32_t csum)
lro->dest_ip == ip->ip_dst.s_addr) {
/* Try to append it */
if (__predict_false(seq != lro->next_seq)) {
/* out of order packet */
if (__predict_false(seq != lro->next_seq ||
(tcp_data_len == 0 &&
lro->ack_seq == tcp->th_ack))) {
/* out of order packet or dup ack */
SLIST_REMOVE(&ss->lro_active, lro,
lro_entry, next);
mxge_lro_flush(ss, lro);