tcp: simplify tcp_mark_skb_lost

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This patch consolidates and simplifes the loss marking logic used
by a few loss detections (RACK, RFC6675, NewReno). Previously
each detection uses a subset of several intertwined subroutines.
This unncessary complexity has led to bugs (and fixes of bug fixes).

tcp_mark_skb_lost now is the single one routine to mark a packet loss
when a loss detection caller deems an skb ist lost:

   1. rewind tp->retransmit_hint_skb if skb has lower sequence or
      all lost ones have been retransmitted.

   2. book-keeping: adjust flags and counts depending on if skb was
      retransmitted or not.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Yuchung Cheng 2020-09-25 10:04:30 -07:00 • committed by David S. Miller

parent fd2146741c

commit 686989700c

1 changed files with 22 additions and 37 deletions

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59

net/ipv4/tcp_input.c

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