tcp: ensure to use the most recently sent skb when filling the rate sample
If an ACK (s)acks multiple skbs, we favor the information from the most recently sent skb by choosing the skb with the highest prior_delivered count. But in the interval between receiving ACKs, we send multiple skbs with the same prior_delivered, because the tp->delivered only changes when we receive an ACK. We used RACK's solution, copying tcp_rack_sent_after() as tcp_skb_sent_after() helper to determine "which packet was sent last?". Later, we will use tcp_skb_sent_after() instead in RACK. Fixes: b9f64820 ("tcp: track data delivery rate for a TCP connection") Signed-off-by:Pengcheng Yang <yangpc@wangsu.com> Cc: Paolo Abeni <pabeni@redhat.com> Acked-by:
Neal Cardwell <ncardwell@google.com> Tested-by:
Neal Cardwell <ncardwell@google.com> Reviewed-by:
Eric Dumazet <edumazet@google.com> Link: https://lore.kernel.org/r/1650422081-22153-1-git-send-email-yangpc@wangsu.com Signed-off-by:
Jakub Kicinski <kuba@kernel.org>
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