From: Eric Dumazet <edumazet@google.com>
Date: Thu, 5 Mar 2015 16:03:06 +0000 (-0800)
Subject: tcp: align tcp_xmit_size_goal() on tcp_tso_autosize()
X-Git-Tag: omap-for-v4.1/wl12xx-dt~34^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6c09fa09d;p=pandora-kernel.git

tcp: align tcp_xmit_size_goal() on tcp_tso_autosize()

With some mss values, it is possible tcp_xmit_size_goal() puts
one segment more in TSO packet than tcp_tso_autosize().

We send then one TSO packet followed by one single MSS.

It is not a serious bug, but we can do slightly better, especially
for drivers using netif_set_gso_max_size() to lower gso_max_size.

Using same formula avoids these corner cases and makes
tcp_xmit_size_goal() a bit faster.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Fixes: 605ad7f184b6 ("tcp: refine TSO autosizing")
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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