]> git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/commit
tcp: properly update lost_cnt_hint during shifting
authorYan, Zheng <zheng.z.yan@intel.com>
Sun, 2 Oct 2011 04:21:50 +0000 (04:21 +0000)
committerDavid S. Miller <davem@davemloft.net>
Wed, 5 Oct 2011 03:31:24 +0000 (23:31 -0400)
commit1e5289e121372a3494402b1b131b41bfe1cf9b7f
treebbab77cce265f29d9b494446fd0eb0a0819878d6
parent260fcbeb1ae9e768a44c9925338fbacb0d7e5ba9
tcp: properly update lost_cnt_hint during shifting

lost_skb_hint is used by tcp_mark_head_lost() to mark the first unhandled skb.
lost_cnt_hint is the number of packets or sacked packets before the lost_skb_hint;
When shifting a skb that is before the lost_skb_hint, if tcp_is_fack() is ture,
the skb has already been counted in the lost_cnt_hint; if tcp_is_fack() is false,
tcp_sacktag_one() will increase the lost_cnt_hint. So tcp_shifted_skb() does not
need to adjust the lost_cnt_hint by itself. When shifting a skb that is equal to
lost_skb_hint, the shifted packets will not be counted by tcp_mark_head_lost().
So tcp_shifted_skb() should adjust the lost_cnt_hint even tcp_is_fack(tp) is true.

Signed-off-by: Zheng Yan <zheng.z.yan@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/tcp_input.c