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13 June 2022, 11:31:42 UTC
Revision 1e5289e121372a3494402b1b131b41bfe1cf9b7f authored by Yan, Zheng on 02 October 2011, 04:21:50 UTC, committed by David S. Miller on 05 October 2011, 03:31:24 UTC 
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>
1 parent 260fcbe
History
Tip revision: 1e5289e121372a3494402b1b131b41bfe1cf9b7f authored by Yan, Zheng on 02 October 2011, 04:21:50 UTC
tcp: properly update lost_cnt_hint during shifting
Tip revision: 1e5289e
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