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default to doing lla_lookup with shared afdata lock and returning a

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shared lock on the lle - thus restoring parallel performance to
pre-arpv2 level
This commit is contained in:
Kip Macy 2008-12-17 00:14:28 +00:00
parent 991f8615e4
commit 00a46b3122
1 changed files with 10 additions and 9 deletions
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19
sys/netinet/if_ether.c
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@ -251,7 +251,7 @@ arpresolve(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m,
{
INIT_VNET_INET(ifp->if_vnet);
struct llentry *la = 0;
u_int flags;
u_int flags = 0;
int error, renew;
*lle = NULL;
@ -268,18 +268,19 @@ arpresolve(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m,
return (0);
}
}
flags = (ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) ? 0 : LLE_CREATE;
/* XXXXX
* Since this function returns an llentry, the
* lock is held by the caller.
* XXX if caller is required to hold lock, assert it
*/
retry:
IF_AFDATA_LOCK(ifp);
IF_AFDATA_RLOCK(ifp);
la = lla_lookup(LLTABLE(ifp), flags, dst);
IF_AFDATA_UNLOCK(ifp);
IF_AFDATA_RUNLOCK(ifp);
if ((la == NULL) && ((flags & LLE_EXCLUSIVE) == 0)
&& ((ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) == 0)) {
flags |= (LLE_CREATE | LLE_EXCLUSIVE);
IF_AFDATA_WLOCK(ifp);
la = lla_lookup(LLTABLE(ifp), flags, dst);
IF_AFDATA_WUNLOCK(ifp);
}
if (la == NULL) {
if (flags & LLE_CREATE)
log(LOG_DEBUG,