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authorEric Dumazet <edumazet@google.com>2016-06-27 17:38:50 +0200
committerDavid S. Miller <davem@davemloft.net>2016-06-29 05:25:11 -0400
commita3d2e9f8eb1487f4191ff08ce2d3d63702c65a90 (patch)
tree6bd92ff1c7e9c968a795b73804f7cc2869f68659 /Documentation
parent96183182ad05d1ce31b9048921c12bf4ad621eaf (diff)
tcp: do not send too big packets at retransmit time
Arjun reported a bug in TCP stack and bisected it to a recent commit. In case where we process SACK, we can coalesce multiple skbs into fat ones (tcp_shift_skb_data()), to lower write queue overhead, because we do not expect to retransmit these packets. However, SACK reneging can happen, forcing the sender to retransmit all these packets. If skb->len is above 64KB, we then send buggy IP packets that could hang TSO engine on cxgb4. Neal suggested to use tcp_tso_autosize() instead of tp->gso_segs so that we cook packets of optimal size vs TCP/pacing. Thanks to Arjun for reporting the bug and running the tests ! Fixes: 10d3be569243 ("tcp-tso: do not split TSO packets at retransmit time") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Arjun V <arjun@chelsio.com> Tested-by: Arjun V <arjun@chelsio.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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