From owner-svn-src-stable@freebsd.org Thu Jun 20 07:50:40 2019 Return-Path: Delivered-To: svn-src-stable@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 2A01D15D67FF; Thu, 20 Jun 2019 07:50:40 +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 B781E6F795; Thu, 20 Jun 2019 07:50:39 +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 543939020; Thu, 20 Jun 2019 07:50:39 +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 x5K7oddM006668; Thu, 20 Jun 2019 07:50:39 GMT (envelope-from tuexen@FreeBSD.org) Received: (from tuexen@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x5K7odkA006667; Thu, 20 Jun 2019 07:50:39 GMT (envelope-from tuexen@FreeBSD.org) Message-Id: <201906200750.x5K7odkA006667@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: tuexen set sender to tuexen@FreeBSD.org using -f From: Michael Tuexen Date: Thu, 20 Jun 2019 07:50:39 +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: r349226 - stable/12/sys/netinet/tcp_stacks X-SVN-Group: stable-12 X-SVN-Commit-Author: tuexen X-SVN-Commit-Paths: stable/12/sys/netinet/tcp_stacks X-SVN-Commit-Revision: 349226 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: B781E6F795 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)[-0.996,0]; NEURAL_HAM_SHORT(-0.95)[-0.952,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; NEURAL_HAM_LONG(-1.00)[-1.000,0] X-BeenThere: svn-src-stable@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for all the -stable branches of the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jun 2019 07:50:40 -0000 Author: tuexen Date: Thu Jun 20 07:50:38 2019 New Revision: 349226 URL: https://svnweb.freebsd.org/changeset/base/349226 Log: MFC r348728: r347382 added receiver side DSACK support for the TCP base stack. The corresponding changes for the RACK stack where missed and are added by this commit. Modified: stable/12/sys/netinet/tcp_stacks/rack.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/netinet/tcp_stacks/rack.c ============================================================================== --- stable/12/sys/netinet/tcp_stacks/rack.c Thu Jun 20 07:17:16 2019 (r349225) +++ stable/12/sys/netinet/tcp_stacks/rack.c Thu Jun 20 07:50:38 2019 (r349226) @@ -1790,6 +1790,17 @@ rack_drop_checks(struct tcpopt *to, struct mbuf *m, st TCPSTAT_INC(tcps_rcvpartduppack); TCPSTAT_ADD(tcps_rcvpartdupbyte, todrop); } + /* + * 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); + /* + * ACK now, as the next in-sequence segment + * will clear the DSACK block again + */ + tp->t_flags |= TF_ACKNOW; + } *drop_hdrlen += todrop; /* drop from the top afterwards */ th->th_seq += todrop; tlen -= todrop; @@ -4822,6 +4833,8 @@ dodata: /* XXX */ if ((tlen || (thflags & TH_FIN) || tfo_syn) && TCPS_HAVERCVDFIN(tp->t_state) == 0) { tcp_seq save_start = th->th_seq; + tcp_seq save_rnxt = tp->rcv_nxt; + int save_tlen = tlen; m_adj(m, drop_hdrlen); /* delayed header drop */ /* @@ -4864,11 +4877,29 @@ dodata: /* XXX */ * m_adj() doesn't actually frees any mbufs when * trimming from the head. */ - thflags = tcp_reass(tp, th, &save_start, &tlen, m); + tcp_seq temp = save_start; + thflags = tcp_reass(tp, th, &temp, &tlen, m); tp->t_flags |= TF_ACKNOW; } - if (tlen > 0) - tcp_update_sack_list(tp, save_start, save_start + tlen); + if (((tlen == 0) && (save_tlen > 0) && + (SEQ_LT(save_start, save_rnxt)))) { + /* + * 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)) { + /* + * Cleaning sackblks by using zero length + * update. + */ + tcp_update_sack_list(tp, save_start, save_start); + } 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); + } } else { m_freem(m); thflags &= ~TH_FIN;