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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