Author: sephe Date: Fri Apr 1 06:43:05 2016 New Revision: 297483 URL: https://svnweb.freebsd.org/changeset/base/297483
Log: tcp/lro: Change SLIST to LIST, so that removing an entry is O(1) This is kinda critical to the performance when the CPU is slow and network bandwidth is high, e.g. in the hypervisor. Reviewed by: rrs, gallatin, Dexuan Cui <decui microsoft com> Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D5765 Modified: head/sys/compat/linuxkpi/common/include/linux/list.h head/sys/netinet/tcp_lro.c head/sys/netinet/tcp_lro.h Modified: head/sys/compat/linuxkpi/common/include/linux/list.h ============================================================================== --- head/sys/compat/linuxkpi/common/include/linux/list.h Fri Apr 1 06:28:33 2016 (r297482) +++ head/sys/compat/linuxkpi/common/include/linux/list.h Fri Apr 1 06:43:05 2016 (r297483) @@ -61,6 +61,7 @@ #include <netinet/in.h> #include <netinet/in_pcb.h> #include <netinet/in_var.h> +#include <netinet/tcp_lro.h> #include <netinet6/in6_var.h> #include <netinet6/nd6.h> Modified: head/sys/netinet/tcp_lro.c ============================================================================== --- head/sys/netinet/tcp_lro.c Fri Apr 1 06:28:33 2016 (r297482) +++ head/sys/netinet/tcp_lro.c Fri Apr 1 06:43:05 2016 (r297483) @@ -93,8 +93,8 @@ tcp_lro_init_args(struct lro_ctrl *lc, s lc->lro_ackcnt_lim = TCP_LRO_ACKCNT_MAX; lc->lro_length_lim = TCP_LRO_LENGTH_MAX; lc->ifp = ifp; - SLIST_INIT(&lc->lro_free); - SLIST_INIT(&lc->lro_active); + LIST_INIT(&lc->lro_free); + LIST_INIT(&lc->lro_active); /* compute size to allocate */ size = (lro_mbufs * sizeof(struct mbuf *)) + @@ -113,7 +113,7 @@ tcp_lro_init_args(struct lro_ctrl *lc, s /* setup linked list */ for (i = 0; i != lro_entries; i++) - SLIST_INSERT_HEAD(&lc->lro_free, le + i, next); + LIST_INSERT_HEAD(&lc->lro_free, le + i, next); return (0); } @@ -125,11 +125,11 @@ tcp_lro_free(struct lro_ctrl *lc) unsigned x; /* reset LRO free list */ - SLIST_INIT(&lc->lro_free); + LIST_INIT(&lc->lro_free); /* free active mbufs, if any */ - while ((le = SLIST_FIRST(&lc->lro_active)) != NULL) { - SLIST_REMOVE_HEAD(&lc->lro_active, next); + while ((le = LIST_FIRST(&lc->lro_active)) != NULL) { + LIST_REMOVE(le, next); m_freem(le->m_head); } @@ -233,8 +233,8 @@ tcp_lro_rx_done(struct lro_ctrl *lc) { struct lro_entry *le; - while ((le = SLIST_FIRST(&lc->lro_active)) != NULL) { - SLIST_REMOVE_HEAD(&lc->lro_active, next); + while ((le = LIST_FIRST(&lc->lro_active)) != NULL) { + LIST_REMOVE(le, next); tcp_lro_flush(lc, le); } } @@ -245,14 +245,14 @@ tcp_lro_flush_inactive(struct lro_ctrl * struct lro_entry *le, *le_tmp; struct timeval tv; - if (SLIST_EMPTY(&lc->lro_active)) + if (LIST_EMPTY(&lc->lro_active)) return; getmicrotime(&tv); timevalsub(&tv, timeout); - SLIST_FOREACH_SAFE(le, &lc->lro_active, next, le_tmp) { + LIST_FOREACH_SAFE(le, &lc->lro_active, next, le_tmp) { if (timevalcmp(&tv, &le->mtime, >=)) { - SLIST_REMOVE(&lc->lro_active, le, lro_entry, next); + LIST_REMOVE(le, next); tcp_lro_flush(lc, le); } } @@ -348,7 +348,7 @@ tcp_lro_flush(struct lro_ctrl *lc, struc lc->lro_queued += le->append_cnt + 1; lc->lro_flushed++; bzero(le, sizeof(*le)); - SLIST_INSERT_HEAD(&lc->lro_free, le, next); + LIST_INSERT_HEAD(&lc->lro_free, le, next); } static int @@ -593,7 +593,7 @@ tcp_lro_rx(struct lro_ctrl *lc, struct m seq = ntohl(th->th_seq); /* Try to find a matching previous segment. */ - SLIST_FOREACH(le, &lc->lro_active, next) { + LIST_FOREACH(le, &lc->lro_active, next) { if (le->eh_type != eh_type) continue; if (le->source_port != th->th_sport || @@ -620,7 +620,7 @@ tcp_lro_rx(struct lro_ctrl *lc, struct m /* Flush now if appending will result in overflow. */ if (le->p_len > (lc->lro_length_lim - tcp_data_len)) { - SLIST_REMOVE(&lc->lro_active, le, lro_entry, next); + LIST_REMOVE(le, next); tcp_lro_flush(lc, le); break; } @@ -629,7 +629,7 @@ tcp_lro_rx(struct lro_ctrl *lc, struct m if (__predict_false(seq != le->next_seq || (tcp_data_len == 0 && le->ack_seq == th->th_ack))) { /* Out of order packet or duplicate ACK. */ - SLIST_REMOVE(&lc->lro_active, le, lro_entry, next); + LIST_REMOVE(le, next); tcp_lro_flush(lc, le); return (TCP_LRO_CANNOT); } @@ -662,8 +662,7 @@ tcp_lro_rx(struct lro_ctrl *lc, struct m * be further delayed. */ if (le->append_cnt >= lc->lro_ackcnt_lim) { - SLIST_REMOVE(&lc->lro_active, le, lro_entry, - next); + LIST_REMOVE(le, next); tcp_lro_flush(lc, le); } return (0); @@ -687,7 +686,7 @@ tcp_lro_rx(struct lro_ctrl *lc, struct m * overflow, pro-actively flush now. */ if (le->p_len > (lc->lro_length_lim - lc->ifp->if_mtu)) { - SLIST_REMOVE(&lc->lro_active, le, lro_entry, next); + LIST_REMOVE(le, next); tcp_lro_flush(lc, le); } else getmicrotime(&le->mtime); @@ -696,13 +695,13 @@ tcp_lro_rx(struct lro_ctrl *lc, struct m } /* Try to find an empty slot. */ - if (SLIST_EMPTY(&lc->lro_free)) + if (LIST_EMPTY(&lc->lro_free)) return (TCP_LRO_NO_ENTRIES); /* Start a new segment chain. */ - le = SLIST_FIRST(&lc->lro_free); - SLIST_REMOVE_HEAD(&lc->lro_free, next); - SLIST_INSERT_HEAD(&lc->lro_active, le, next); + le = LIST_FIRST(&lc->lro_free); + LIST_REMOVE(le, next); + LIST_INSERT_HEAD(&lc->lro_active, le, next); getmicrotime(&le->mtime); /* Start filling in details. */ Modified: head/sys/netinet/tcp_lro.h ============================================================================== --- head/sys/netinet/tcp_lro.h Fri Apr 1 06:28:33 2016 (r297482) +++ head/sys/netinet/tcp_lro.h Fri Apr 1 06:43:05 2016 (r297483) @@ -41,9 +41,8 @@ #define TCP_LRO_SEQUENCE(mb) \ (mb)->m_pkthdr.PH_loc.thirtytwo[0] -struct lro_entry -{ - SLIST_ENTRY(lro_entry) next; +struct lro_entry { + LIST_ENTRY(lro_entry) next; struct mbuf *m_head; struct mbuf *m_tail; union { @@ -72,7 +71,7 @@ struct lro_entry uint16_t timestamp; /* flag, not a TCP hdr field. */ struct timeval mtime; }; -SLIST_HEAD(lro_head, lro_entry); +LIST_HEAD(lro_head, lro_entry); #define le_ip4 leip.ip4 #define le_ip6 leip.ip6 _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"