From owner-svn-src-stable-12@freebsd.org Fri Jan 25 18:30:13 2019 Return-Path: Delivered-To: svn-src-stable-12@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 8B9D414BD94A; Fri, 25 Jan 2019 18:30:13 +0000 (UTC) (envelope-from shurd@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) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 305F68FF40; Fri, 25 Jan 2019 18:30:13 +0000 (UTC) (envelope-from shurd@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 13C8DC119; Fri, 25 Jan 2019 18:30:13 +0000 (UTC) (envelope-from shurd@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x0PIUCqM036874; Fri, 25 Jan 2019 18:30:12 GMT (envelope-from shurd@FreeBSD.org) Received: (from shurd@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x0PIUC5K036873; Fri, 25 Jan 2019 18:30:12 GMT (envelope-from shurd@FreeBSD.org) Message-Id: <201901251830.x0PIUC5K036873@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: shurd set sender to shurd@FreeBSD.org using -f From: Stephen Hurd Date: Fri, 25 Jan 2019 18:30:12 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r343441 - stable/12/sys/netinet X-SVN-Group: stable-12 X-SVN-Commit-Author: shurd X-SVN-Commit-Paths: stable/12/sys/netinet X-SVN-Commit-Revision: 343441 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 305F68FF40 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.95 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-0.998,0]; NEURAL_HAM_SHORT(-0.95)[-0.955,0]; NEURAL_HAM_LONG(-1.00)[-0.999,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US] X-BeenThere: svn-src-stable-12@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for only the 12-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Jan 2019 18:30:13 -0000 Author: shurd Date: Fri Jan 25 18:30:12 2019 New Revision: 343441 URL: https://svnweb.freebsd.org/changeset/base/343441 Log: MFC r343047: Fix window update issue when scaling disabled When the TCP window scale option is not used, and the window opens up enough in one soreceive, a window update will not be sent. For example, if recwin == 65535, so->so_rcv.sb_hiwat >= 262144, and so->so_rcv.sb_hiwat <= 524272, the window update will never be sent. This is because recwin and adv are clamped to TCP_MAXWIN << tp->rcv_scale, and so will never be >= so->so_rcv.sb_hiwat / 4 or <= so->so_rcv.sb_hiwat / 8. This patch ensures a window update is sent if the window opens by TCP_MAXWIN << tp->rcv_scale, which should only happen when the window size goes from zero to the max expressible. This issue looks like it was introduced in r306769 when recwin was clamped to TCP_MAXWIN << tp->rcv_scale. Sponsored by: Limelight Networks Differential Revision: https://reviews.freebsd.org/D18821 Modified: stable/12/sys/netinet/tcp_output.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/netinet/tcp_output.c ============================================================================== --- stable/12/sys/netinet/tcp_output.c Fri Jan 25 17:09:26 2019 (r343440) +++ stable/12/sys/netinet/tcp_output.c Fri Jan 25 18:30:12 2019 (r343441) @@ -656,7 +656,8 @@ after_sack_rexmit: if (adv >= (int32_t)(2 * tp->t_maxseg) && (adv >= (int32_t)(so->so_rcv.sb_hiwat / 4) || recwin <= (so->so_rcv.sb_hiwat / 8) || - so->so_rcv.sb_hiwat <= 8 * tp->t_maxseg)) + so->so_rcv.sb_hiwat <= 8 * tp->t_maxseg || + adv >= TCP_MAXWIN << tp->rcv_scale)) goto send; if (2 * adv >= (int32_t)so->so_rcv.sb_hiwat) goto send;