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tcp: do not set queue_mapping on SYNACK

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At the time of commit fff3269907 ("tcp: reflect SYN queue_mapping into
SYNACK packets") we had little ways to cope with SYN floods.

We no longer need to reflect incoming skb queue mappings, and instead
can pick a TX queue based on cpu cooking the SYNACK, with normal XPS
affinities.

Note that all SYNACK retransmits were picking TX queue 0, this no longer
is a win given that SYNACK rtx are now distributed on all cpus.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2015-10-16 13:00:01 -07:00
committed by David S. Miller
parent 951b5d959f
commit dc6ef6be52
6 changed files with 4 additions and 9 deletions
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2
include/net/tcp.h
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@@ -1716,7 +1716,7 @@ struct tcp_request_sock_ops {
__u32 (*init_seq)(const struct sk_buff *skb);
int (*send_synack)(const struct sock *sk, struct dst_entry *dst,
struct flowi *fl, struct request_sock *req,
u16 queue_mapping, struct tcp_fastopen_cookie *foc,
struct tcp_fastopen_cookie *foc,
bool attach_req);
};