Author: gallatin Date: Thu Jul 28 19:32:25 2016 New Revision: 303457 URL: https://svnweb.freebsd.org/changeset/base/303457
Log: Call tcp_notify() directly to shoot down routes, rather than calling in_pcbnotifyall(). This avoids lock contention on tcbinfo due to in_pcbnotifyall() holding the tcbinfo write lock while walking all connections. Reviewed by: rrs, karels MFC after: 2 weeks Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D7251 Modified: head/sys/netinet/tcp_subr.c Modified: head/sys/netinet/tcp_subr.c ============================================================================== --- head/sys/netinet/tcp_subr.c Thu Jul 28 18:40:43 2016 (r303456) +++ head/sys/netinet/tcp_subr.c Thu Jul 28 19:32:25 2016 (r303457) @@ -1950,11 +1950,7 @@ tcp_ctlinput(int cmd, struct sockaddr *s else if (V_icmp_may_rst && (cmd == PRC_UNREACH_ADMIN_PROHIB || cmd == PRC_UNREACH_PORT || cmd == PRC_TIMXCEED_INTRANS) && ip) notify = tcp_drop_syn_sent; - else if (PRC_IS_REDIRECT(cmd)) { - /* signal EHOSTDOWN, as it flushes the cached route */ - in_pcbnotifyall(&V_tcbinfo, faddr, EHOSTDOWN, notify); - return; - } + /* * Hostdead is ugly because it goes linearly through all PCBs. * XXX: We never get this from ICMP, otherwise it makes an @@ -1975,7 +1971,12 @@ tcp_ctlinput(int cmd, struct sockaddr *s INP_INFO_RLOCK(&V_tcbinfo); inp = in_pcblookup(&V_tcbinfo, faddr, th->th_dport, ip->ip_src, th->th_sport, INPLOOKUP_WLOCKPCB, NULL); - if (inp != NULL) { + if (inp != NULL && PRC_IS_REDIRECT(cmd)) { + /* signal EHOSTDOWN, as it flushes the cached route */ + inp = (*notify)(inp, EHOSTDOWN); + if (inp != NULL) + INP_WUNLOCK(inp); + } else if (inp != NULL) { if (!(inp->inp_flags & INP_TIMEWAIT) && !(inp->inp_flags & INP_DROPPED) && !(inp->inp_socket == NULL)) { _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "[email protected]"
