From: David S. Miller Date: Mon, 21 Nov 2016 18:20:17 +0000 (-0500) Subject: Merge branch 'tcp-cong-undo_cwnd-mandatory' X-Git-Tag: v5.15~12359^2~207 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9e36ced6335be42e637a827b64f510f143dbb5a7;p=platform%2Fkernel%2Flinux-starfive.git Merge branch 'tcp-cong-undo_cwnd-mandatory' Florian Westphal says: ==================== tcp: make undo_cwnd mandatory for congestion modules highspeed, illinois, scalable, veno and yeah congestion control algorithms don't provide a 'cwnd_undo' function. This makes the stack default to a 'reno undo' which doubles cwnd. However, the ssthresh implementation of these algorithms do not halve the slowstart threshold. This causes similar issue as the one fixed for dctcp in ce6dd23329b1e ("dctcp: avoid bogus doubling of cwnd after loss"). In light of this it seems better to remove the fallback and make undo_cwnd mandatory. First patch fixes those spots where reno undo seems incorrect by providing .cwnd_undo functions, second patch removes the fallback. ==================== Signed-off-by: David S. Miller --- 9e36ced6335be42e637a827b64f510f143dbb5a7