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authorIlpo Järvinen <ilpo.jarvinen@helsinki.fi>2007-12-25 00:33:45 -0500
committerDavid S. Miller <davem@davemloft.net>2008-01-28 18:00:06 -0500
commit0e3a4803aa06cd7bc2cfc1d04289df4f6027640a (patch)
treec3af99ceea81cd14e14c96fe0c85f39236de933b /fs/befs
parent7ffc49a6ee92b7138c2ee28073a8e10e58335d62 (diff)
[TCP]: Force TSO splits to MSS boundaries
If snd_wnd - snd_nxt wasn't multiple of MSS, skb was split on odd boundary by the callers of tcp_window_allows. We try really hard to avoid unnecessary modulos. Therefore the old caller side check "if (skb->len < limit)" was too wide as well because limit is not bound in any way to skb->len and can cause spurious testing for trimming in the middle of the queue while we only wanted that to happen at the tail of the queue. A simple additional caller side check for tcp_write_queue_tail would likely have resulted 2 x modulos because the limit would have to be first calculated from window, however, doing that unnecessary modulo is not mandatory. After a minor change to the algorithm, simply determine first if the modulo is needed at all and at that point immediately decide also from which value it should be calculated from. This approach also kills some duplicated code. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
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