From owner-dev-commits-src-branches@freebsd.org Fri Jan 29 11:01:39 2021 Return-Path: Delivered-To: dev-commits-src-branches@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id A140F4E732F; Fri, 29 Jan 2021 11:01:39 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4DRvXz44pvz4jXP; Fri, 29 Jan 2021 11:01:39 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 6B055214D0; Fri, 29 Jan 2021 11:01:39 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 10TB1dwl027475; Fri, 29 Jan 2021 11:01:39 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 10TB1djv027474; Fri, 29 Jan 2021 11:01:39 GMT (envelope-from git) Date: Fri, 29 Jan 2021 11:01:39 GMT Message-Id: <202101291101.10TB1djv027474@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Richard Scheffenegger Subject: git: 76dd854f47f4 - stable/13 - TCP PRR: Patch div/0 in tcp_prr_partialack MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: rscheff X-Git-Repository: src X-Git-Refname: refs/heads/stable/13 X-Git-Reftype: branch X-Git-Commit: 76dd854f47f4aea703093647a158f280d383ea6d Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-branches@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commits to the stable branches of the FreeBSD src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 Jan 2021 11:01:39 -0000 The branch stable/13 has been updated by rscheff: URL: https://cgit.FreeBSD.org/src/commit/?id=76dd854f47f4aea703093647a158f280d383ea6d commit 76dd854f47f4aea703093647a158f280d383ea6d Author: Richard Scheffenegger AuthorDate: 2021-01-26 15:06:32 +0000 Commit: Richard Scheffenegger CommitDate: 2021-01-29 10:57:21 +0000 TCP PRR: Patch div/0 in tcp_prr_partialack Adding a safety net prior to the division in tcp_prr_partialack function, which was missed in D28114. Reviewed-by: tuexen, mm, @transport MFC: 3 days Differential Revision: https://reviews.freebsd.org/D28326 (cherry picked from commit 6a376af0cd212be4e16d013d35a0e2eec1dbb8ae) --- sys/netinet/tcp_input.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c index 4b8f91ed9d0b..459b78cd444a 100644 --- a/sys/netinet/tcp_input.c +++ b/sys/netinet/tcp_input.c @@ -510,7 +510,6 @@ cc_post_recovery(struct tcpcb *tp, struct tcphdr *th) } /* XXXLAS: EXIT_RECOVERY ? */ tp->t_bytes_acked = 0; - tp->sackhint.recover_fs = 0; } /* @@ -3948,10 +3947,13 @@ tcp_prr_partialack(struct tcpcb *tp, struct tcphdr *th) /* * Proportional Rate Reduction */ - if (pipe > tp->snd_ssthresh) + if (pipe > tp->snd_ssthresh) { + if (tp->sackhint.recover_fs == 0) + tp->sackhint.recover_fs = + max(1, tp->snd_nxt - tp->snd_una); snd_cnt = (tp->sackhint.prr_delivered * tp->snd_ssthresh / tp->sackhint.recover_fs) - tp->sackhint.sack_bytes_rexmit; - else { + } else { if (V_tcp_do_prr_conservative) limit = tp->sackhint.prr_delivered - tp->sackhint.sack_bytes_rexmit;