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net neigh: Optimize neighbor entry size calculation. 

When allocating memory for neighbour cache entry, if
tbl->entry_size is not set, we always calculate
sizeof(struct neighbour) + tbl->key_len, which is common
in the same table.

With this change, set tbl->entry_size during the table
initialization phase, if it was not set, and use it in
neigh_alloc() and neighbour_priv().

This change also allow us to have both of protocol private
data and device priate data at tha same time.

Note that the only user of prototcol private is DECnet
and the only user of device private is ATM CLIP.
Since those are exclusive, we have not been facing issues
here.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki / 吉藤英明 2013-01-24 00:44:23 +00:00 committed by David S. Miller
parent cdda88912d
commit 08433eff2d
2 changed files with 8 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/neighbour.h
View File

@ -184,7 +184,7 @@ struct neigh_table {
static inline void *neighbour_priv(const struct neighbour *n)
{
return (char *)n + ALIGN(sizeof(*n) + n->tbl->key_len, NEIGH_PRIV_ALIGN);
return (char *)n + n->tbl->entry_size;
}
/* flags for neigh_update() */

16
net/core/neighbour.c
View File

@ -290,15 +290,7 @@ static struct neighbour *neigh_alloc(struct neigh_table *tbl, struct net_device
goto out_entries;
}
if (tbl->entry_size)
n = kzalloc(tbl->entry_size, GFP_ATOMIC);
else {
int sz = sizeof(*n) + tbl->key_len;
sz = ALIGN(sz, NEIGH_PRIV_ALIGN);
sz += dev->neigh_priv_len;
n = kzalloc(sz, GFP_ATOMIC);
}
n = kzalloc(tbl->entry_size + dev->neigh_priv_len, GFP_ATOMIC);
if (!n)
goto out_entries;
@ -1546,6 +1538,12 @@ static void neigh_table_init_no_netlink(struct neigh_table *tbl)
if (!tbl->nht || !tbl->phash_buckets)
panic("cannot allocate neighbour cache hashes");
if (!tbl->entry_size)
tbl->entry_size = ALIGN(offsetof(struct neighbour, primary_key) +
tbl->key_len, NEIGH_PRIV_ALIGN);
else
WARN_ON(tbl->entry_size % NEIGH_PRIV_ALIGN);
rwlock_init(&tbl->lock);
INIT_DEFERRABLE_WORK(&tbl->gc_work, neigh_periodic_work);
schedule_delayed_work(&tbl->gc_work, tbl->parms.reachable_time);