Date: Sun, 15 Nov 2020 11:46:45 +0000 (UTC) From: Kristof Provost <kp@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r367705 - stable/12/sys/net Message-ID: <202011151146.0AFBkjKq068200@repo.freebsd.org>
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Author: kp Date: Sun Nov 15 11:46:44 2020 New Revision: 367705 URL: https://svnweb.freebsd.org/changeset/base/367705 Log: bridge: epoch-ification Undo the revert (r363568). This commit still violates epoch rules by sleeping within NET_EPOCH. That will be resolved in the following commit. Modified: stable/12/sys/net/if_bridge.c Modified: stable/12/sys/net/if_bridge.c ============================================================================== --- stable/12/sys/net/if_bridge.c Sun Nov 15 11:28:02 2020 (r367704) +++ stable/12/sys/net/if_bridge.c Sun Nov 15 11:46:44 2020 (r367705) @@ -189,41 +189,14 @@ extern void nd6_setmtu(struct ifnet *); */ #define BRIDGE_LOCK_INIT(_sc) do { \ mtx_init(&(_sc)->sc_mtx, "if_bridge", NULL, MTX_DEF); \ - cv_init(&(_sc)->sc_cv, "if_bridge_cv"); \ } while (0) #define BRIDGE_LOCK_DESTROY(_sc) do { \ mtx_destroy(&(_sc)->sc_mtx); \ - cv_destroy(&(_sc)->sc_cv); \ } while (0) #define BRIDGE_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) #define BRIDGE_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) #define BRIDGE_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_mtx, MA_OWNED) #define BRIDGE_UNLOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_mtx, MA_NOTOWNED) -#define BRIDGE_LOCK2REF(_sc, _err) do { \ - mtx_assert(&(_sc)->sc_mtx, MA_OWNED); \ - if ((_sc)->sc_iflist_xcnt > 0) \ - (_err) = EBUSY; \ - else \ - (_sc)->sc_iflist_ref++; \ - mtx_unlock(&(_sc)->sc_mtx); \ -} while (0) -#define BRIDGE_UNREF(_sc) do { \ - mtx_lock(&(_sc)->sc_mtx); \ - (_sc)->sc_iflist_ref--; \ - if (((_sc)->sc_iflist_xcnt > 0) && ((_sc)->sc_iflist_ref == 0)) \ - cv_broadcast(&(_sc)->sc_cv); \ - mtx_unlock(&(_sc)->sc_mtx); \ -} while (0) -#define BRIDGE_XLOCK(_sc) do { \ - mtx_assert(&(_sc)->sc_mtx, MA_OWNED); \ - (_sc)->sc_iflist_xcnt++; \ - while ((_sc)->sc_iflist_ref > 0) \ - cv_wait(&(_sc)->sc_cv, &(_sc)->sc_mtx); \ -} while (0) -#define BRIDGE_XDROP(_sc) do { \ - mtx_assert(&(_sc)->sc_mtx, MA_OWNED); \ - (_sc)->sc_iflist_xcnt--; \ -} while (0) /* * Bridge interface list entry. @@ -237,6 +210,8 @@ struct bridge_iflist { uint32_t bif_addrmax; /* max # of addresses */ uint32_t bif_addrcnt; /* cur. # of addresses */ uint32_t bif_addrexceeded;/* # of address violations */ + + struct epoch_context bif_epoch_ctx; }; /* @@ -250,6 +225,9 @@ struct bridge_rtnode { uint8_t brt_flags; /* address flags */ uint8_t brt_addr[ETHER_ADDR_LEN]; uint16_t brt_vlan; /* vlan id */ + + struct vnet *brt_vnet; + struct epoch_context brt_epoch_ctx; }; #define brt_ifp brt_dst->bif_ifp @@ -260,13 +238,10 @@ struct bridge_softc { struct ifnet *sc_ifp; /* make this an interface */ LIST_ENTRY(bridge_softc) sc_list; struct mtx sc_mtx; - struct cv sc_cv; uint32_t sc_brtmax; /* max # of addresses */ uint32_t sc_brtcnt; /* cur. # of addresses */ uint32_t sc_brttimeout; /* rt timeout in seconds */ struct callout sc_brcallout; /* bridge callout */ - uint32_t sc_iflist_ref; /* refcount for sc_iflist */ - uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ CK_LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ CK_LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ CK_LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ @@ -276,6 +251,8 @@ struct bridge_softc { uint32_t sc_brtexceeded; /* # of cache drops */ struct ifnet *sc_ifaddr; /* member mac copied from */ struct ether_addr sc_defaddr; /* Default MAC address */ + + struct epoch_context sc_epoch_ctx; }; VNET_DEFINE_STATIC(struct mtx, bridge_list_mtx); @@ -595,6 +572,11 @@ vnet_bridge_uninit(const void *unused __unused) if_clone_detach(V_bridge_cloner); V_bridge_cloner = NULL; BRIDGE_LIST_LOCK_DESTROY(); + + /* Before we can destroy the uma zone, because there are callbacks that + * use it. */ + epoch_drain_callbacks(net_epoch_preempt); + uma_zdestroy(V_bridge_rtnode_zone); } VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, @@ -757,6 +739,17 @@ bridge_clone_create(struct if_clone *ifc, int unit, ca return (0); } +static void +bridge_clone_destroy_cb(struct epoch_context *ctx) +{ + struct bridge_softc *sc; + + sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx); + + BRIDGE_LOCK_DESTROY(sc); + free(sc, M_DEVBUF); +} + /* * bridge_clone_destroy: * @@ -767,7 +760,9 @@ bridge_clone_destroy(struct ifnet *ifp) { struct bridge_softc *sc = ifp->if_softc; struct bridge_iflist *bif; + struct epoch_tracker et; + NET_EPOCH_ENTER_ET(et); BRIDGE_LOCK(sc); bridge_stop(ifp, 1); @@ -792,11 +787,12 @@ bridge_clone_destroy(struct ifnet *ifp) BRIDGE_LIST_UNLOCK(); bstp_detach(&sc->sc_stp); + NET_EPOCH_EXIT_ET(et); + ether_ifdetach(ifp); if_free(ifp); - BRIDGE_LOCK_DESTROY(sc); - free(sc, M_DEVBUF); + epoch_call(net_epoch_preempt, &sc->sc_epoch_ctx, bridge_clone_destroy_cb); } /* @@ -822,7 +818,10 @@ bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t da struct ifdrv *ifd = (struct ifdrv *) data; const struct bridge_control *bc; int error = 0, oldmtu; + struct epoch_tracker et; + NET_EPOCH_ENTER_ET(et); + switch (cmd) { case SIOCADDMULTI: @@ -943,6 +942,8 @@ bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t da break; } + NET_EPOCH_EXIT_ET(et); + return (error); } @@ -957,6 +958,8 @@ bridge_mutecaps(struct bridge_softc *sc) struct bridge_iflist *bif; int enabled, mask; + BRIDGE_LOCK_ASSERT(sc); + /* Initial bitmask of capabilities to test */ mask = BRIDGE_IFCAPS_MASK; @@ -965,7 +968,6 @@ bridge_mutecaps(struct bridge_softc *sc) mask &= bif->bif_savedcaps; } - BRIDGE_XLOCK(sc); CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { enabled = bif->bif_ifp->if_capenable; enabled &= ~BRIDGE_IFCAPS_STRIP; @@ -976,8 +978,6 @@ bridge_mutecaps(struct bridge_softc *sc) bridge_set_ifcap(sc, bif, enabled); BRIDGE_LOCK(sc); } - BRIDGE_XDROP(sc); - } static void @@ -1018,7 +1018,7 @@ bridge_lookup_member(struct bridge_softc *sc, const ch struct bridge_iflist *bif; struct ifnet *ifp; - BRIDGE_LOCK_ASSERT(sc); + MPASS(in_epoch(net_epoch_preempt)); CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { ifp = bif->bif_ifp; @@ -1039,7 +1039,7 @@ bridge_lookup_member_if(struct bridge_softc *sc, struc { struct bridge_iflist *bif; - BRIDGE_LOCK_ASSERT(sc); + MPASS(in_epoch(net_epoch_preempt)); CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { if (bif->bif_ifp == member_ifp) @@ -1049,6 +1049,16 @@ bridge_lookup_member_if(struct bridge_softc *sc, struc return (NULL); } +static void +bridge_delete_member_cb(struct epoch_context *ctx) +{ + struct bridge_iflist *bif; + + bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx); + + free(bif, M_DEVBUF); +} + /* * bridge_delete_member: * @@ -1068,9 +1078,7 @@ bridge_delete_member(struct bridge_softc *sc, struct b bstp_disable(&bif->bif_stp); ifs->if_bridge = NULL; - BRIDGE_XLOCK(sc); CK_LIST_REMOVE(bif, bif_next); - BRIDGE_XDROP(sc); /* * If removing the interface that gave the bridge its mac address, set @@ -1129,7 +1137,9 @@ bridge_delete_member(struct bridge_softc *sc, struct b } bstp_destroy(&bif->bif_stp); /* prepare to free */ BRIDGE_LOCK(sc); - free(bif, M_DEVBUF); + + epoch_call(net_epoch_preempt, &bif->bif_epoch_ctx, + bridge_delete_member_cb); } /* @@ -1146,7 +1156,9 @@ bridge_delete_span(struct bridge_softc *sc, struct bri ("%s: not a span interface", __func__)); CK_LIST_REMOVE(bif, bif_next); - free(bif, M_DEVBUF); + + epoch_call(net_epoch_preempt, &bif->bif_epoch_ctx, + bridge_delete_member_cb); } static int @@ -1202,7 +1214,6 @@ bridge_ioctl_add(struct bridge_softc *sc, void *arg) * If any, remove all inet6 addresses from the member * interfaces. */ - BRIDGE_XLOCK(sc); CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { if (in6ifa_llaonifp(bif->bif_ifp)) { BRIDGE_UNLOCK(sc); @@ -1215,7 +1226,6 @@ bridge_ioctl_add(struct bridge_softc *sc, void *arg) bif->bif_ifp->if_xname); } } - BRIDGE_XDROP(sc); if (in6ifa_llaonifp(ifs)) { BRIDGE_UNLOCK(sc); in6_ifdetach(ifs); @@ -1424,9 +1434,9 @@ bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) bifc->ifbic_len = buflen; return (0); } - BRIDGE_UNLOCK(sc); - outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); - BRIDGE_LOCK(sc); + outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); + if (outbuf == NULL) + return (ENOMEM); count = 0; buf = outbuf; @@ -1486,9 +1496,9 @@ bridge_ioctl_rts(struct bridge_softc *sc, void *arg) count++; buflen = sizeof(bareq) * count; - BRIDGE_UNLOCK(sc); - outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); - BRIDGE_LOCK(sc); + outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); + if (outbuf == NULL) + return (ENOMEM); count = 0; buf = outbuf; @@ -1529,12 +1539,17 @@ bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) struct bridge_iflist *bif; int error; + MPASS(in_epoch(net_epoch_preempt)); + bif = bridge_lookup_member(sc, req->ifba_ifsname); if (bif == NULL) return (ENOENT); + /* bridge_rtupdate() may acquire the lock. */ + BRIDGE_UNLOCK(sc); error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, req->ifba_flags); + BRIDGE_LOCK(sc); return (error); } @@ -1809,9 +1824,9 @@ bridge_ioctl_gifsstp(struct bridge_softc *sc, void *ar return (0); } - BRIDGE_UNLOCK(sc); - outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); - BRIDGE_LOCK(sc); + outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); + if (outbuf == NULL) + return (ENOMEM); count = 0; buf = outbuf; @@ -1873,6 +1888,7 @@ bridge_ifdetach(void *arg __unused, struct ifnet *ifp) { struct bridge_softc *sc = ifp->if_bridge; struct bridge_iflist *bif; + struct epoch_tracker et; if (ifp->if_flags & IFF_RENAMING) return; @@ -1883,6 +1899,7 @@ bridge_ifdetach(void *arg __unused, struct ifnet *ifp) */ return; } + NET_EPOCH_ENTER_ET(et); /* Check if the interface is a bridge member */ if (sc != NULL) { BRIDGE_LOCK(sc); @@ -1892,6 +1909,7 @@ bridge_ifdetach(void *arg __unused, struct ifnet *ifp) bridge_delete_member(sc, bif, 1); BRIDGE_UNLOCK(sc); + NET_EPOCH_EXIT_ET(et); return; } @@ -1908,6 +1926,7 @@ bridge_ifdetach(void *arg __unused, struct ifnet *ifp) BRIDGE_UNLOCK(sc); } BRIDGE_LIST_UNLOCK(); + NET_EPOCH_EXIT_ET(et); } /* @@ -2062,23 +2081,26 @@ static int bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, struct rtentry *rt) { + struct epoch_tracker et; struct ether_header *eh; struct ifnet *dst_if; struct bridge_softc *sc; uint16_t vlan; + NET_EPOCH_ENTER_ET(et); + if (m->m_len < ETHER_HDR_LEN) { m = m_pullup(m, ETHER_HDR_LEN); - if (m == NULL) + if (m == NULL) { + NET_EPOCH_EXIT_ET(et); return (0); + } } eh = mtod(m, struct ether_header *); sc = ifp->if_bridge; vlan = VLANTAGOF(m); - BRIDGE_LOCK(sc); - /* * If bridge is down, but the original output interface is up, * go ahead and send out that interface. Otherwise, the packet @@ -2100,16 +2122,10 @@ bridge_output(struct ifnet *ifp, struct mbuf *m, struc if (dst_if == NULL) { struct bridge_iflist *bif; struct mbuf *mc; - int error = 0, used = 0; + int used = 0; bridge_span(sc, m); - BRIDGE_LOCK2REF(sc, error); - if (error) { - m_freem(m); - return (0); - } - CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { dst_if = bif->bif_ifp; @@ -2143,7 +2159,7 @@ bridge_output(struct ifnet *ifp, struct mbuf *m, struc } if (used == 0) m_freem(m); - BRIDGE_UNREF(sc); + NET_EPOCH_EXIT_ET(et); return (0); } @@ -2155,12 +2171,12 @@ sendunicast: bridge_span(sc, m); if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { m_freem(m); - BRIDGE_UNLOCK(sc); + NET_EPOCH_EXIT_ET(et); return (0); } - BRIDGE_UNLOCK(sc); bridge_enqueue(sc, dst_if, m); + NET_EPOCH_EXIT_ET(et); return (0); } @@ -2173,25 +2189,28 @@ sendunicast: static int bridge_transmit(struct ifnet *ifp, struct mbuf *m) { + struct epoch_tracker et; struct bridge_softc *sc; struct ether_header *eh; struct ifnet *dst_if; int error = 0; + NET_EPOCH_ENTER_ET(et); + sc = ifp->if_softc; ETHER_BPF_MTAP(ifp, m); eh = mtod(m, struct ether_header *); - BRIDGE_LOCK(sc); if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { - BRIDGE_UNLOCK(sc); error = bridge_enqueue(sc, dst_if, m); } else bridge_broadcast(sc, ifp, m, 0); + NET_EPOCH_EXIT_ET(et); + return (error); } @@ -2221,6 +2240,8 @@ bridge_forward(struct bridge_softc *sc, struct bridge_ uint8_t *dst; int error; + MPASS(in_epoch(net_epoch_preempt)); + src_if = m->m_pkthdr.rcvif; ifp = sc->sc_ifp; @@ -2299,12 +2320,10 @@ bridge_forward(struct bridge_softc *sc, struct bridge_ || PFIL_HOOKED(&V_inet6_pfil_hook) #endif ) { - BRIDGE_UNLOCK(sc); if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) return; if (m == NULL) return; - BRIDGE_LOCK(sc); } if (dst_if == NULL) { @@ -2332,8 +2351,6 @@ bridge_forward(struct bridge_softc *sc, struct bridge_ dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) goto drop; - BRIDGE_UNLOCK(sc); - if (PFIL_HOOKED(&V_inet_pfil_hook) #ifdef INET6 || PFIL_HOOKED(&V_inet6_pfil_hook) @@ -2349,7 +2366,6 @@ bridge_forward(struct bridge_softc *sc, struct bridge_ return; drop: - BRIDGE_UNLOCK(sc); m_freem(m); } @@ -2362,6 +2378,7 @@ drop: static struct mbuf * bridge_input(struct ifnet *ifp, struct mbuf *m) { + struct epoch_tracker et; struct bridge_softc *sc = ifp->if_bridge; struct bridge_iflist *bif, *bif2; struct ifnet *bifp; @@ -2370,8 +2387,12 @@ bridge_input(struct ifnet *ifp, struct mbuf *m) uint16_t vlan; int error; - if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) + NET_EPOCH_ENTER_ET(et); + + if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { + NET_EPOCH_EXIT_ET(et); return (m); + } bifp = sc->sc_ifp; vlan = VLANTAGOF(m); @@ -2388,12 +2409,12 @@ bridge_input(struct ifnet *ifp, struct mbuf *m) if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); m_freem(m); + NET_EPOCH_EXIT_ET(et); return (NULL); } - BRIDGE_LOCK(sc); bif = bridge_lookup_member_if(sc, ifp); if (bif == NULL) { - BRIDGE_UNLOCK(sc); + NET_EPOCH_EXIT_ET(et); return (m); } @@ -2406,13 +2427,13 @@ bridge_input(struct ifnet *ifp, struct mbuf *m) if (memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ - BRIDGE_UNLOCK(sc); + NET_EPOCH_EXIT_ET(et); return (NULL); } if ((bif->bif_flags & IFBIF_STP) && bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { - BRIDGE_UNLOCK(sc); + NET_EPOCH_EXIT_ET(et); return (m); } @@ -2423,7 +2444,7 @@ bridge_input(struct ifnet *ifp, struct mbuf *m) */ mc = m_dup(m, M_NOWAIT); if (mc == NULL) { - BRIDGE_UNLOCK(sc); + NET_EPOCH_EXIT_ET(et); return (m); } @@ -2450,12 +2471,13 @@ bridge_input(struct ifnet *ifp, struct mbuf *m) } /* Return the original packet for local processing. */ + NET_EPOCH_EXIT_ET(et); return (m); } if ((bif->bif_flags & IFBIF_STP) && bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { - BRIDGE_UNLOCK(sc); + NET_EPOCH_EXIT_ET(et); return (m); } @@ -2495,7 +2517,6 @@ bridge_input(struct ifnet *ifp, struct mbuf *m) OR_PFIL_HOOKED_INET6)) { \ if (bridge_pfil(&m, NULL, ifp, \ PFIL_IN) != 0 || m == NULL) { \ - BRIDGE_UNLOCK(sc); \ return (NULL); \ } \ eh = mtod(m, struct ether_header *); \ @@ -2505,13 +2526,13 @@ bridge_input(struct ifnet *ifp, struct mbuf *m) error = bridge_rtupdate(sc, eh->ether_shost, \ vlan, bif, 0, IFBAF_DYNAMIC); \ if (error && bif->bif_addrmax) { \ - BRIDGE_UNLOCK(sc); \ m_freem(m); \ + NET_EPOCH_EXIT_ET(et); \ return (NULL); \ } \ } \ m->m_pkthdr.rcvif = iface; \ - BRIDGE_UNLOCK(sc); \ + NET_EPOCH_EXIT_ET(et); \ return (m); \ } \ \ @@ -2519,8 +2540,8 @@ bridge_input(struct ifnet *ifp, struct mbuf *m) if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ OR_CARP_CHECK_WE_ARE_SRC((iface)) \ ) { \ - BRIDGE_UNLOCK(sc); \ m_freem(m); \ + NET_EPOCH_EXIT_ET(et); \ return (NULL); \ } @@ -2551,6 +2572,7 @@ bridge_input(struct ifnet *ifp, struct mbuf *m) /* Perform the bridge forwarding function. */ bridge_forward(sc, bif, m); + NET_EPOCH_EXIT_ET(et); return (NULL); } @@ -2570,16 +2592,12 @@ bridge_broadcast(struct bridge_softc *sc, struct ifnet struct bridge_iflist *dbif, *sbif; struct mbuf *mc; struct ifnet *dst_if; - int error = 0, used = 0, i; + int used = 0, i; + MPASS(in_epoch(net_epoch_preempt)); + sbif = bridge_lookup_member_if(sc, src_if); - BRIDGE_LOCK2REF(sc, error); - if (error) { - m_freem(m); - return; - } - /* Filter on the bridge interface before broadcasting */ if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) #ifdef INET6 @@ -2587,9 +2605,9 @@ bridge_broadcast(struct bridge_softc *sc, struct ifnet #endif )) { if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) - goto out; + return; if (m == NULL) - goto out; + return; } CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { @@ -2652,9 +2670,6 @@ bridge_broadcast(struct bridge_softc *sc, struct ifnet } if (used == 0) m_freem(m); - -out: - BRIDGE_UNREF(sc); } /* @@ -2670,6 +2685,8 @@ bridge_span(struct bridge_softc *sc, struct mbuf *m) struct ifnet *dst_if; struct mbuf *mc; + MPASS(in_epoch(net_epoch_preempt)); + if (CK_LIST_EMPTY(&sc->sc_spanlist)) return; @@ -2701,7 +2718,8 @@ bridge_rtupdate(struct bridge_softc *sc, const uint8_t struct bridge_rtnode *brt; int error; - BRIDGE_LOCK_ASSERT(sc); + MPASS(in_epoch(net_epoch_preempt)); + BRIDGE_UNLOCK_ASSERT(sc); /* Check the source address is valid and not multicast. */ if (ETHER_IS_MULTICAST(dst) || @@ -2718,13 +2736,24 @@ bridge_rtupdate(struct bridge_softc *sc, const uint8_t * update it, otherwise create a new one. */ if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { + BRIDGE_LOCK(sc); + + /* Check again, now that we have the lock. There could have + * been a race and we only want to insert this once. */ + if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) != NULL) { + BRIDGE_UNLOCK(sc); + return (0); + } + if (sc->sc_brtcnt >= sc->sc_brtmax) { sc->sc_brtexceeded++; + BRIDGE_UNLOCK(sc); return (ENOSPC); } /* Check per interface address limits (if enabled) */ if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { bif->bif_addrexceeded++; + BRIDGE_UNLOCK(sc); return (ENOSPC); } @@ -2734,8 +2763,11 @@ bridge_rtupdate(struct bridge_softc *sc, const uint8_t * address. */ brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO); - if (brt == NULL) + if (brt == NULL) { + BRIDGE_UNLOCK(sc); return (ENOMEM); + } + brt->brt_vnet = curvnet; if (bif->bif_flags & IFBIF_STICKY) brt->brt_flags = IFBAF_STICKY; @@ -2747,17 +2779,22 @@ bridge_rtupdate(struct bridge_softc *sc, const uint8_t if ((error = bridge_rtnode_insert(sc, brt)) != 0) { uma_zfree(V_bridge_rtnode_zone, brt); + BRIDGE_UNLOCK(sc); return (error); } brt->brt_dst = bif; bif->bif_addrcnt++; + + BRIDGE_UNLOCK(sc); } if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && brt->brt_dst != bif) { + BRIDGE_LOCK(sc); brt->brt_dst->bif_addrcnt--; brt->brt_dst = bif; brt->brt_dst->bif_addrcnt++; + BRIDGE_UNLOCK(sc); } if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) @@ -2778,7 +2815,7 @@ bridge_rtlookup(struct bridge_softc *sc, const uint8_t { struct bridge_rtnode *brt; - BRIDGE_LOCK_ASSERT(sc); + MPASS(in_epoch(net_epoch_preempt)); if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) return (NULL); @@ -3017,7 +3054,7 @@ bridge_rtnode_lookup(struct bridge_softc *sc, const ui uint32_t hash; int dir; - BRIDGE_LOCK_ASSERT(sc); + MPASS(in_epoch(net_epoch_preempt)); hash = bridge_rthash(sc, addr); CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { @@ -3080,6 +3117,18 @@ out: return (0); } +static void +bridge_rtnode_destroy_cb(struct epoch_context *ctx) +{ + struct bridge_rtnode *brt; + + brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx); + + CURVNET_SET(brt->brt_vnet); + uma_zfree(V_bridge_rtnode_zone, brt); + CURVNET_RESTORE(); +} + /* * bridge_rtnode_destroy: * @@ -3095,7 +3144,9 @@ bridge_rtnode_destroy(struct bridge_softc *sc, struct CK_LIST_REMOVE(brt, brt_list); sc->sc_brtcnt--; brt->brt_dst->bif_addrcnt--; - uma_zfree(V_bridge_rtnode_zone, brt); + + epoch_call(net_epoch_preempt, &brt->brt_epoch_ctx, + bridge_rtnode_destroy_cb); } /* @@ -3640,17 +3691,20 @@ bridge_linkstate(struct ifnet *ifp) { struct bridge_softc *sc = ifp->if_bridge; struct bridge_iflist *bif; + struct epoch_tracker et; - BRIDGE_LOCK(sc); + NET_EPOCH_ENTER_ET(et); + bif = bridge_lookup_member_if(sc, ifp); if (bif == NULL) { - BRIDGE_UNLOCK(sc); + NET_EPOCH_EXIT_ET(et); return; } bridge_linkcheck(sc); - BRIDGE_UNLOCK(sc); bstp_linkstate(&bif->bif_stp); + + NET_EPOCH_EXIT_ET(et); } static void @@ -3659,7 +3713,8 @@ bridge_linkcheck(struct bridge_softc *sc) struct bridge_iflist *bif; int new_link, hasls; - BRIDGE_LOCK_ASSERT(sc); + MPASS(in_epoch(net_epoch_preempt)); + new_link = LINK_STATE_DOWN; hasls = 0; /* Our link is considered up if at least one of our ports is active */
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