Author: kp
Date: Fri Jun 26 12:11:22 2020
New Revision: 362650
URL: https://svnweb.freebsd.org/changeset/base/362650
Log:
MFC r360345:
bridge: epoch-ification
Run the bridge datapath under epoch, rather than under the
BRIDGE_LOCK().
We still take the BRIDGE_LOCK() whenever we insert or delete items in
the relevant lists, but we use epoch callbacks to free items so that
it's safe to iterate the lists without the BRIDGE_LOCK.
Tests on mercat5/6 shows this increases bridge throughput significantly,
from 3.7Mpps to 18.6Mpps.
MFC after: The FreeBSD Foundation
Modified:
stable/12/sys/net/if_bridge.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sys/net/if_bridge.c
==============================================================================
--- stable/12/sys/net/if_bridge.c Fri Jun 26 10:08:57 2020
(r362649)
+++ stable/12/sys/net/if_bridge.c Fri Jun 26 12:11:22 2020
(r362650)
@@ -237,6 +237,8 @@ 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 +252,9 @@ 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
@@ -276,6 +281,8 @@ 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 +602,11 @@ 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. */
+ NET_EPOCH_WAIT();
+
uma_zdestroy(V_bridge_rtnode_zone);
}
VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
@@ -757,6 +769,17 @@ 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:
*
@@ -795,8 +818,7 @@ bridge_clone_destroy(struct ifnet *ifp)
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 +844,10 @@ 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 +968,8 @@ bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t da
break;
}
+ NET_EPOCH_EXIT_ET(et);
+
return (error);
}
@@ -957,6 +984,8 @@ 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;
@@ -1018,7 +1047,7 @@ 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 +1068,7 @@ 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 +1078,16 @@ 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:
*
@@ -1129,7 +1168,9 @@ 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 +1187,9 @@ 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
@@ -1529,12 +1572,17 @@ 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);
}
@@ -1873,6 +1921,7 @@ 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 +1932,7 @@ 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 +1942,7 @@ 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 +1959,7 @@ bridge_ifdetach(void *arg __unused, struct ifnet *ifp)
BRIDGE_UNLOCK(sc);
}
BRIDGE_LIST_UNLOCK();
+ NET_EPOCH_EXIT_ET(et);
}
/*
@@ -2067,6 +2119,8 @@ bridge_output(struct ifnet *ifp, struct mbuf *m, struc
struct bridge_softc *sc;
uint16_t vlan;
+ MPASS(in_epoch(net_epoch_preempt));
+
if (m->m_len < ETHER_HDR_LEN) {
m = m_pullup(m, ETHER_HDR_LEN);
if (m == NULL)
@@ -2077,8 +2131,6 @@ bridge_output(struct ifnet *ifp, struct mbuf *m, struc
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 +2152,10 @@ 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 +2189,6 @@ bridge_output(struct ifnet *ifp, struct mbuf *m, struc
}
if (used == 0)
m_freem(m);
- BRIDGE_UNREF(sc);
return (0);
}
@@ -2155,11 +2200,9 @@ sendunicast:
bridge_span(sc, m);
if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) {
m_freem(m);
- BRIDGE_UNLOCK(sc);
return (0);
}
- BRIDGE_UNLOCK(sc);
bridge_enqueue(sc, dst_if, m);
return (0);
}
@@ -2184,10 +2227,8 @@ bridge_transmit(struct ifnet *ifp, struct mbuf *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);
@@ -2221,6 +2262,8 @@ 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 +2342,10 @@ 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 +2373,6 @@ 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 +2388,6 @@ bridge_forward(struct bridge_softc *sc, struct bridge_
return;
drop:
- BRIDGE_UNLOCK(sc);
m_freem(m);
}
@@ -2370,6 +2408,8 @@ bridge_input(struct ifnet *ifp, struct mbuf *m)
uint16_t vlan;
int error;
+ MPASS(in_epoch(net_epoch_preempt));
+
if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
return (m);
@@ -2390,10 +2430,8 @@ bridge_input(struct ifnet *ifp, struct mbuf *m)
m_freem(m);
return (NULL);
}
- BRIDGE_LOCK(sc);
bif = bridge_lookup_member_if(sc, ifp);
if (bif == NULL) {
- BRIDGE_UNLOCK(sc);
return (m);
}
@@ -2406,13 +2444,11 @@ 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);
return (NULL);
}
if ((bif->bif_flags & IFBIF_STP) &&
bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
- BRIDGE_UNLOCK(sc);
return (m);
}
@@ -2423,7 +2459,6 @@ bridge_input(struct ifnet *ifp, struct mbuf *m)
*/
mc = m_dup(m, M_NOWAIT);
if (mc == NULL) {
- BRIDGE_UNLOCK(sc);
return (m);
}
@@ -2455,7 +2490,6 @@ bridge_input(struct ifnet *ifp, struct mbuf *m)
if ((bif->bif_flags & IFBIF_STP) &&
bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) {
- BRIDGE_UNLOCK(sc);
return (m);
}
@@ -2495,7 +2529,6 @@ 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 +2538,11 @@ 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); \
return (NULL); \
} \
} \
m->m_pkthdr.rcvif = iface; \
- BRIDGE_UNLOCK(sc); \
return (m); \
} \
\
@@ -2519,7 +2550,6 @@ 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); \
return (NULL); \
}
@@ -2570,16 +2600,12 @@ 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 +2613,9 @@ 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 +2678,6 @@ bridge_broadcast(struct bridge_softc *sc, struct ifnet
}
if (used == 0)
m_freem(m);
-
-out:
- BRIDGE_UNREF(sc);
}
/*
@@ -2670,6 +2693,8 @@ 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 +2726,8 @@ 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 +2744,24 @@ 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 +2771,11 @@ 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 +2787,22 @@ 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 +2823,7 @@ 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 +3062,7 @@ 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 +3125,18 @@ 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 +3152,9 @@ 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 +3699,20 @@ 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 +3721,8 @@ 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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