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tcp: Apply device TSO segment limit earlier

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Cache the device gso_max_segs in sock::sk_gso_max_segs and use it to
limit the size of TSO skbs.  This avoids the need to fall back to
software GSO for local TCP senders.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2012-07-30 16:11:42 +00:00 • committed by David S. Miller
parent 7e6d06f0de
commit 1485348d24
5 changed files with 20 additions and 11 deletions
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3
net/ipv4/tcp_cong.c
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@ -291,7 +291,8 @@ bool tcp_is_cwnd_limited(const struct sock *sk, u32 in_flight)
left = tp->snd_cwnd - in_flight;
if (sk_can_gso(sk) &&
left * sysctl_tcp_tso_win_divisor < tp->snd_cwnd &&
left * tp->mss_cache < sk->sk_gso_max_size)
left * tp->mss_cache < sk->sk_gso_max_size &&
left < sk->sk_gso_max_segs)
return true;
return left <= tcp_max_tso_deferred_mss(tp);
}