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tcp: dont drop MTU reduction indications

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ICMP messages generated in output path if frame length is bigger than
mtu are actually lost because socket is owned by user (doing the xmit)

One example is the ipgre_tunnel_xmit() calling
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));

We had a similar case fixed in commit a34a101e1e (ipv6: disable GSO on
sockets hitting dst_allfrag).

Problem of such fix is that it relied on retransmit timers, so short tcp
sessions paid a too big latency increase price.

This patch uses the tcp_release_cb() infrastructure so that MTU
reduction messages (ICMP messages) are not lost, and no extra delay
is added in TCP transmits.

Reported-by: Maciej Żenczykowski <[email protected]>
Diagnosed-by: Neal Cardwell <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Cc: Nandita Dukkipati <[email protected]>
Cc: Tom Herbert <[email protected]>
Cc: Tore Anderson <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2012-07-23 09:48:52 +02:00 • committed by David S. Miller
commit 563d34d057
5 changed files with 51 additions and 21 deletions
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1
include/net/sock.h
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@ -859,6 +859,7 @@ struct proto {
struct sk_buff *skb);
void (*release_cb)(struct sock *sk);
void (*mtu_reduced)(struct sock *sk);
/* Keeping track of sk's, looking them up, and port selection methods. */
void (*hash)(struct sock *sk);