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[NET]: Fix neighbour destructor handling. 

->neigh_destructor() is killed (not used), replaced with
->neigh_cleanup(), which is called when neighbor entry goes to dead
state. At this point everything is still valid: neigh->dev,
neigh->parms etc.

The device should guarantee that dead neighbor entries (neigh->dead !=
0) do not get private part initialized, otherwise nobody will cleanup
it.

I think this is enough for ipoib which is the only user of this thing.
Initialization private part of neighbor entries happens in ipib
start_xmit routine, which is not reached when device is down.  But it
would be better to add explicit test for neigh->dead in any case.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Kuznetsov 2007-03-24 12:52:16 -07:00 committed by David S. Miller
parent e1701c68c1
commit ecbb416939
4 changed files with 14 additions and 17 deletions
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6
drivers/infiniband/ulp/ipoib/ipoib_main.c
View File

@ -814,7 +814,7 @@ static void ipoib_set_mcast_list(struct net_device *dev)
queue_work(ipoib_workqueue, &priv->restart_task);
}
static void ipoib_neigh_destructor(struct neighbour *n)
static void ipoib_neigh_cleanup(struct neighbour *n)
{
struct ipoib_neigh *neigh;
struct ipoib_dev_priv *priv = netdev_priv(n->dev);
@ -822,7 +822,7 @@ static void ipoib_neigh_destructor(struct neighbour *n)
struct ipoib_ah *ah = NULL;
ipoib_dbg(priv,
"neigh_destructor for %06x " IPOIB_GID_FMT "\n",
"neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
IPOIB_QPN(n->ha),
IPOIB_GID_RAW_ARG(n->ha + 4));
@ -874,7 +874,7 @@ void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
{
parms->neigh_destructor = ipoib_neigh_destructor;
parms->neigh_cleanup = ipoib_neigh_cleanup;
return 0;
}

2
include/net/neighbour.h
View File

@ -36,7 +36,7 @@ struct neigh_parms
struct net_device *dev;
struct neigh_parms *next;
int (*neigh_setup)(struct neighbour *);
void (*neigh_destructor)(struct neighbour *);
void (*neigh_cleanup)(struct neighbour *);
struct neigh_table *tbl;
void *sysctl_table;

9
net/atm/clip.c
View File

@ -261,14 +261,6 @@ static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb)
spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags);
}
static void clip_neigh_destroy(struct neighbour *neigh)
{
DPRINTK("clip_neigh_destroy (neigh %p)\n", neigh);
if (NEIGH2ENTRY(neigh)->vccs)
printk(KERN_CRIT "clip_neigh_destroy: vccs != NULL !!!\n");
NEIGH2ENTRY(neigh)->vccs = (void *) NEIGHBOR_DEAD;
}
static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb)
{
DPRINTK("clip_neigh_solicit (neigh %p, skb %p)\n", neigh, skb);
@ -342,7 +334,6 @@ static struct neigh_table clip_tbl = {
/* parameters are copied from ARP ... */
.parms = {
.tbl = &clip_tbl,
.neigh_destructor = clip_neigh_destroy,
.base_reachable_time = 30 * HZ,
.retrans_time = 1 * HZ,
.gc_staletime = 60 * HZ,

14
net/core/neighbour.c
View File

@ -140,6 +140,8 @@ static int neigh_forced_gc(struct neigh_table *tbl)
n->dead = 1;
shrunk = 1;
write_unlock(&n->lock);
if (n->parms->neigh_cleanup)
n->parms->neigh_cleanup(n);
neigh_release(n);
continue;
}
@ -211,6 +213,8 @@ static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev)
NEIGH_PRINTK2("neigh %p is stray.\n", n);
}
write_unlock(&n->lock);
if (n->parms->neigh_cleanup)
n->parms->neigh_cleanup(n);
neigh_release(n);
}
}
@ -582,9 +586,6 @@ void neigh_destroy(struct neighbour *neigh)
kfree(hh);
}
if (neigh->parms->neigh_destructor)
(neigh->parms->neigh_destructor)(neigh);
skb_queue_purge(&neigh->arp_queue);
dev_put(neigh->dev);
@ -675,6 +676,8 @@ static void neigh_periodic_timer(unsigned long arg)
*np = n->next;
n->dead = 1;
write_unlock(&n->lock);
if (n->parms->neigh_cleanup)
n->parms->neigh_cleanup(n);
neigh_release(n);
continue;
}
@ -2088,8 +2091,11 @@ void __neigh_for_each_release(struct neigh_table *tbl,
} else
np = &n->next;
write_unlock(&n->lock);
if (release)
if (release) {
if (n->parms->neigh_cleanup)
n->parms->neigh_cleanup(n);
neigh_release(n);
}
}
}
}