Date: Fri, 28 Aug 2009 21:10:26 +0000 (UTC) From: Robert Watson <rwatson@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r196630 - in stable/8/sys: . amd64/include/xen cddl/contrib/opensolaris contrib/dev/acpica contrib/pf dev/xen/xenpci net netinet netinet6 Message-ID: <200908282110.n7SLAQpi036619@svn.freebsd.org>
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Author: rwatson Date: Fri Aug 28 21:10:26 2009 New Revision: 196630 URL: http://svn.freebsd.org/changeset/base/196630 Log: Merge r196535 from head to stable/8: Use locks specific to the lltable code, rather than borrow the ifnet list/index locks, to protect link layer address tables. This avoids lock order issues during interface teardown, but maintains the bug that sysctl copy routines may be called while a non-sleepable lock is held. Reviewed by: bz, kmacy, qingli Approved by: re (kib) Modified: stable/8/sys/ (props changed) stable/8/sys/amd64/include/xen/ (props changed) stable/8/sys/cddl/contrib/opensolaris/ (props changed) stable/8/sys/contrib/dev/acpica/ (props changed) stable/8/sys/contrib/pf/ (props changed) stable/8/sys/dev/xen/xenpci/ (props changed) stable/8/sys/net/if_llatbl.c stable/8/sys/net/if_llatbl.h stable/8/sys/netinet/in.c stable/8/sys/netinet6/in6.c Modified: stable/8/sys/net/if_llatbl.c ============================================================================== --- stable/8/sys/net/if_llatbl.c Fri Aug 28 21:07:43 2009 (r196629) +++ stable/8/sys/net/if_llatbl.c Fri Aug 28 21:10:26 2009 (r196630) @@ -62,6 +62,9 @@ static SLIST_HEAD(, lltable) lltables = extern void arprequest(struct ifnet *, struct in_addr *, struct in_addr *, u_char *); +struct rwlock lltable_rwlock; +RW_SYSINIT(lltable_rwlock, &lltable_rwlock, "lltable_rwlock"); + /* * Dump arp state for a specific address family. */ @@ -71,7 +74,7 @@ lltable_sysctl_dumparp(int af, struct sy struct lltable *llt; int error = 0; - IFNET_RLOCK(); + LLTABLE_RLOCK(); SLIST_FOREACH(llt, &lltables, llt_link) { if (llt->llt_af == af) { error = llt->llt_dump(llt, wr); @@ -80,7 +83,7 @@ lltable_sysctl_dumparp(int af, struct sy } } done: - IFNET_RUNLOCK(); + LLTABLE_RUNLOCK(); return (error); } @@ -144,8 +147,6 @@ llentry_update(struct llentry **llep, st /* * Free all entries from given table and free itself. - * Since lltables collects from all of the intefaces, - * the caller of this function must acquire IFNET_WLOCK(). */ void lltable_free(struct lltable *llt) @@ -155,9 +156,9 @@ lltable_free(struct lltable *llt) KASSERT(llt != NULL, ("%s: llt is NULL", __func__)); - IFNET_WLOCK(); + LLTABLE_WLOCK(); SLIST_REMOVE(&lltables, llt, lltable, llt_link); - IFNET_WUNLOCK(); + LLTABLE_WUNLOCK(); for (i=0; i < LLTBL_HASHTBL_SIZE; i++) { LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { @@ -178,7 +179,7 @@ lltable_drain(int af) struct llentry *lle; register int i; - IFNET_RLOCK(); + LLTABLE_RLOCK(); SLIST_FOREACH(llt, &lltables, llt_link) { if (llt->llt_af != af) continue; @@ -192,7 +193,7 @@ lltable_drain(int af) } } } - IFNET_RUNLOCK(); + LLTABLE_RUNLOCK(); } void @@ -200,14 +201,14 @@ lltable_prefix_free(int af, struct socka { struct lltable *llt; - IFNET_RLOCK_NOSLEEP(); + LLTABLE_RLOCK(); SLIST_FOREACH(llt, &lltables, llt_link) { if (llt->llt_af != af) continue; llt->llt_prefix_free(llt, prefix, mask); } - IFNET_RUNLOCK_NOSLEEP(); + LLTABLE_RUNLOCK(); } @@ -230,9 +231,9 @@ lltable_init(struct ifnet *ifp, int af) for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) LIST_INIT(&llt->lle_head[i]); - IFNET_WLOCK(); + LLTABLE_WLOCK(); SLIST_INSERT_HEAD(&lltables, llt, llt_link); - IFNET_WUNLOCK(); + LLTABLE_WUNLOCK(); return (llt); } @@ -300,13 +301,13 @@ lla_rt_output(struct rt_msghdr *rtm, str } /* XXX linked list may be too expensive */ - IFNET_RLOCK_NOSLEEP(); + LLTABLE_RLOCK(); SLIST_FOREACH(llt, &lltables, llt_link) { if (llt->llt_af == dst->sa_family && llt->llt_ifp == ifp) break; } - IFNET_RUNLOCK_NOSLEEP(); + LLTABLE_RUNLOCK(); KASSERT(llt != NULL, ("Yep, ugly hacks are bad\n")); if (flags && LLE_CREATE) Modified: stable/8/sys/net/if_llatbl.h ============================================================================== --- stable/8/sys/net/if_llatbl.h Fri Aug 28 21:07:43 2009 (r196629) +++ stable/8/sys/net/if_llatbl.h Fri Aug 28 21:10:26 2009 (r196630) @@ -41,6 +41,13 @@ struct rt_addrinfo; struct llentry; LIST_HEAD(llentries, llentry); +extern struct rwlock lltable_rwlock; +#define LLTABLE_RLOCK() rw_rlock(&lltable_rwlock) +#define LLTABLE_RUNLOCK() rw_runlock(&lltable_rwlock) +#define LLTABLE_WLOCK() rw_wlock(&lltable_rwlock) +#define LLTABLE_WUNLOCK() rw_wunlock(&lltable_rwlock) +#define LLTABLE_LOCK_ASSERT() rw_assert(&lltable_rwlock, RA_LOCKED) + /* * Code referencing llentry must at least hold * a shared lock Modified: stable/8/sys/netinet/in.c ============================================================================== --- stable/8/sys/netinet/in.c Fri Aug 28 21:07:43 2009 (r196629) +++ stable/8/sys/netinet/in.c Fri Aug 28 21:10:26 2009 (r196630) @@ -1407,7 +1407,7 @@ in_lltable_dump(struct lltable *llt, str } arpc; int error, i; - IFNET_RLOCK_ASSERT(); + LLTABLE_LOCK_ASSERT(); error = 0; for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { Modified: stable/8/sys/netinet6/in6.c ============================================================================== --- stable/8/sys/netinet6/in6.c Fri Aug 28 21:07:43 2009 (r196629) +++ stable/8/sys/netinet6/in6.c Fri Aug 28 21:10:26 2009 (r196630) @@ -2495,7 +2495,7 @@ in6_lltable_dump(struct lltable *llt, st } ndpc; int i, error; - IFNET_RLOCK_ASSERT(); + LLTABLE_LOCK_ASSERT(); error = 0; for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
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