Date: Tue, 17 May 2016 04:53:22 +0000 (UTC) From: Sepherosa Ziehau <sephe@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r300004 - stable/10/sys/netinet Message-ID: <201605170453.u4H4rME4088068@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: sephe Date: Tue May 17 04:53:21 2016 New Revision: 300004 URL: https://svnweb.freebsd.org/changeset/base/300004 Log: MFC r298769, r299315 r298769 ============= tcp/syncache: Set flowid and hash type properly for SYN|ACK So the underlying drivers can use it to select the sending queue properly for SYN|ACK instead of rolling their own hash. Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D6120 r299315 ============= tcp/syncache: Add comment for syncache_respond Suggested by: hiren, hps Reviewed by: sbruno Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D6148 Modified: stable/10/sys/netinet/tcp_syncache.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/netinet/tcp_syncache.c ============================================================================== --- stable/10/sys/netinet/tcp_syncache.c Tue May 17 04:40:00 2016 (r300003) +++ stable/10/sys/netinet/tcp_syncache.c Tue May 17 04:53:21 2016 (r300004) @@ -124,7 +124,7 @@ SYSCTL_VNET_INT(_net_inet_tcp, OID_AUTO, static void syncache_drop(struct syncache *, struct syncache_head *); static void syncache_free(struct syncache *); static void syncache_insert(struct syncache *, struct syncache_head *); -static int syncache_respond(struct syncache *); +static int syncache_respond(struct syncache *, const struct mbuf *); static struct socket *syncache_socket(struct syncache *, struct socket *, struct mbuf *m); static int syncache_sysctl_count(SYSCTL_HANDLER_ARGS); @@ -480,7 +480,7 @@ syncache_timer(void *xsch) free(s, M_TCPLOG); } - (void) syncache_respond(sc); + (void) syncache_respond(sc, NULL); TCPSTAT_INC(tcps_sc_retransmitted); syncache_timeout(sc, sch, 0); } @@ -1307,7 +1307,7 @@ syncache_add(struct in_conninfo *inc, st s, __func__); free(s, M_TCPLOG); } - if (syncache_respond(sc) == 0) { + if (syncache_respond(sc, m) == 0) { sc->sc_rxmits = 0; syncache_timeout(sc, sch, 1); TCPSTAT_INC(tcps_sndacks); @@ -1476,7 +1476,7 @@ skip_alloc: /* * Do a standard 3-way handshake. */ - if (syncache_respond(sc) == 0) { + if (syncache_respond(sc, m) == 0) { if (V_tcp_syncookies && V_tcp_syncookiesonly && sc != &scs) syncache_free(sc); else if (sc != &scs) @@ -1506,8 +1506,12 @@ tfo_done: return (rv); } +/* + * Send SYN|ACK to the peer. Either in response to the peer's SYN, + * i.e. m0 != NULL, or upon 3WHS ACK timeout, i.e. m0 == NULL. + */ static int -syncache_respond(struct syncache *sc) +syncache_respond(struct syncache *sc, const struct mbuf *m0) { struct ip *ip = NULL; struct mbuf *m; @@ -1664,6 +1668,15 @@ syncache_respond(struct syncache *sc) M_SETFIB(m, sc->sc_inc.inc_fibnum); m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); + /* + * If we have peer's SYN and it has a flowid, then let's assign it to + * our SYN|ACK. ip6_output() and ip_output() will not assign flowid + * to SYN|ACK due to lack of inp here. + */ + if (m0 != NULL && M_HASHTYPE_GET(m0) != M_HASHTYPE_NONE) { + m->m_pkthdr.flowid = m0->m_pkthdr.flowid; + M_HASHTYPE_SET(m, M_HASHTYPE_GET(m0)); + } #ifdef INET6 if (sc->sc_inc.inc_flags & INC_ISIPV6) { m->m_pkthdr.csum_flags = CSUM_TCP_IPV6;
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201605170453.u4H4rME4088068>