net neigh: RCU conversion of neigh hash table
David
This is the first step for RCU conversion of neigh code.
Next patches will convert hash_buckets[] and "struct neighbour" to RCU
protected objects.
Thanks
[PATCH net-next] net neigh: RCU conversion of neigh hash table
Instead of storing hash_buckets, hash_mask and hash_rnd in "struct
neigh_table", a new structure is defined :
struct neigh_hash_table {
struct neighbour **hash_buckets;
unsigned int hash_mask;
__u32 hash_rnd;
struct rcu_head rcu;
};
And "struct neigh_table" has an RCU protected pointer to such a
neigh_hash_table.
This means the signature of (*hash)() function changed: We need to add a
third parameter with the actual hash_rnd value, since this is not
anymore a neigh_table field.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/decnet/dn_neigh.c b/net/decnet/dn_neigh.c
index 0363bb95..a085dbc 100644
--- a/net/decnet/dn_neigh.c
+++ b/net/decnet/dn_neigh.c
@@ -48,7 +48,6 @@
#include <net/dn_neigh.h>
#include <net/dn_route.h>
-static u32 dn_neigh_hash(const void *pkey, const struct net_device *dev);
static int dn_neigh_construct(struct neighbour *);
static void dn_long_error_report(struct neighbour *, struct sk_buff *);
static void dn_short_error_report(struct neighbour *, struct sk_buff *);
@@ -93,6 +92,13 @@
.queue_xmit = dev_queue_xmit
};
+static u32 dn_neigh_hash(const void *pkey,
+ const struct net_device *dev,
+ __u32 hash_rnd)
+{
+ return jhash_2words(*(__u16 *)pkey, 0, hash_rnd);
+}
+
struct neigh_table dn_neigh_table = {
.family = PF_DECnet,
.entry_size = sizeof(struct dn_neigh),
@@ -122,11 +128,6 @@
.gc_thresh3 = 1024,
};
-static u32 dn_neigh_hash(const void *pkey, const struct net_device *dev)
-{
- return jhash_2words(*(__u16 *)pkey, 0, dn_neigh_table.hash_rnd);
-}
-
static int dn_neigh_construct(struct neighbour *neigh)
{
struct net_device *dev = neigh->dev;
