From owner-svn-src-head@freebsd.org Wed Sep 4 04:38:32 2019 Return-Path: Delivered-To: svn-src-head@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 7AB53E441E; Wed, 4 Sep 2019 04:38:32 +0000 (UTC) (envelope-from tuexen@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 46NWKh2SMzz3JWH; Wed, 4 Sep 2019 04:38:32 +0000 (UTC) (envelope-from tuexen@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 37990E2B4; Wed, 4 Sep 2019 04:38:32 +0000 (UTC) (envelope-from tuexen@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x844cWXK087096; Wed, 4 Sep 2019 04:38:32 GMT (envelope-from tuexen@FreeBSD.org) Received: (from tuexen@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x844cWI8087095; Wed, 4 Sep 2019 04:38:32 GMT (envelope-from tuexen@FreeBSD.org) Message-Id: <201909040438.x844cWI8087095@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: tuexen set sender to tuexen@FreeBSD.org using -f From: Michael Tuexen Date: Wed, 4 Sep 2019 04:38:32 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r351801 - head/sys/netinet X-SVN-Group: head X-SVN-Commit-Author: tuexen X-SVN-Commit-Paths: head/sys/netinet X-SVN-Commit-Revision: 351801 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Sep 2019 04:38:32 -0000 Author: tuexen Date: Wed Sep 4 04:38:31 2019 New Revision: 351801 URL: https://svnweb.freebsd.org/changeset/base/351801 Log: Fix the SACK block generation in the base TCP stack by bringing it in sync with the RACK stack. Reviewed by: rrs@ MFC after: 5 days Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D21513 Modified: head/sys/netinet/tcp_input.c Modified: head/sys/netinet/tcp_input.c ============================================================================== --- head/sys/netinet/tcp_input.c Tue Sep 3 22:26:01 2019 (r351800) +++ head/sys/netinet/tcp_input.c Wed Sep 4 04:38:31 2019 (r351801) @@ -2264,7 +2264,8 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, stru * DSACK - add SACK block for dropped range */ if (tp->t_flags & TF_SACK_PERMIT) { - tcp_update_sack_list(tp, th->th_seq, th->th_seq+tlen); + tcp_update_sack_list(tp, th->th_seq, + th->th_seq + todrop); /* * ACK now, as the next in-sequence segment * will clear the DSACK block again @@ -3051,21 +3052,29 @@ dodata: /* XXX */ * DSACK actually handled in the fastpath * above. */ - tcp_update_sack_list(tp, save_start, save_start + save_tlen); - } else - if ((tlen > 0) && SEQ_GT(tp->rcv_nxt, save_rnxt)) { + tcp_update_sack_list(tp, save_start, + save_start + save_tlen); + } else if ((tlen > 0) && SEQ_GT(tp->rcv_nxt, save_rnxt)) { /* * Cleaning sackblks by using zero length * update. */ - tcp_update_sack_list(tp, save_start, save_start); - } else - if ((tlen > 0) && (tlen >= save_tlen)) { + if ((tp->rcv_numsacks >= 1) && + (tp->sackblks[0].end == save_start)) { + /* partial overlap, recorded at todrop above */ + tcp_update_sack_list(tp, tp->sackblks[0].start, + tp->sackblks[0].end); + } else { + tcp_update_dsack_list(tp, save_start, + save_start + save_tlen); + } + } else if ((tlen > 0) && (tlen >= save_tlen)) { /* Update of sackblks. */ - tcp_update_sack_list(tp, save_start, save_start + save_tlen); - } else - if (tlen > 0) { - tcp_update_sack_list(tp, save_start, save_start+tlen); + tcp_update_dsack_list(tp, save_start, + save_start + save_tlen); + } else if (tlen > 0) { + tcp_update_dsack_list(tp, save_start, + save_start + tlen); } } #if 0