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Add hash support to neigh cache

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This patch adds keygen function to the neigh object

Signed-off-by: Shrijeet Mukherjee <shm@cumulusnetworks.com>
Signed-off-by: Nolan Leake <nolan@cumulusnetworks.com>
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Reviewed-by: Wilson Kok <wkok@cumulusnetworks.com>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
This commit is contained in:
roopa 2012-11-09 14:41:35 -08:00 • committed by Thomas Graf
parent e16e8fdcdb
commit 6f24cf12ca
1 changed files with 46 additions and 0 deletions
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46
lib/route/neigh.c
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@ -151,6 +151,7 @@
#include <netlink-local.h>
#include <netlink/netlink.h>
#include <netlink/utils.h>
#include <netlink/hashtable.h>
#include <netlink/route/rtnl.h>
#include <netlink/route/neighbour.h>
#include <netlink/route/link.h>
@ -197,6 +198,50 @@ static int neigh_clone(struct nl_object *_dst, struct nl_object *_src)
return 0;
}
static void neigh_keygen(struct nl_object *obj, uint32_t *hashkey,
uint32_t table_sz)
{
struct rtnl_neigh *neigh = (struct rtnl_neigh *) obj;
unsigned int nkey_sz;
struct nl_addr *addr = NULL;
struct neigh_hash_key {
uint32_t n_family;
uint32_t n_ifindex;
char n_addr[0];
} __attribute__((packed)) *nkey;
char buf[INET6_ADDRSTRLEN+5];
if (neigh->n_dst)
addr = neigh->n_dst;
nkey_sz = sizeof(*nkey);
if (addr)
nkey_sz += nl_addr_get_len(addr);
nkey = calloc(1, nkey_sz);
if (!nkey) {
*hashkey = 0;
return;
}
nkey->n_family = neigh->n_family;
nkey->n_ifindex = neigh->n_ifindex;
if (addr)
memcpy(nkey->n_addr,
nl_addr_get_binary_addr(addr),
nl_addr_get_len(addr));
*hashkey = nl_hash(nkey, nkey_sz, 0) % table_sz;
NL_DBG(5, "neigh %p key (fam %d dev %d addr %s) keysz %d hash 0x%x\n",
neigh, nkey->n_family, nkey->n_ifindex,
nl_addr2str(addr, buf, sizeof(buf)),
nkey_sz, *hashkey);
free(nkey);
return;
}
static int neigh_compare(struct nl_object *_a, struct nl_object *_b,
uint32_t attrs, int flags)
{
@ -825,6 +870,7 @@ static struct nl_object_ops neigh_obj_ops = {
[NL_DUMP_STATS] = neigh_dump_stats,
},
.oo_compare = neigh_compare,
.oo_keygen = neigh_keygen,
.oo_attrs2str = neigh_attrs2str,
.oo_id_attrs = (NEIGH_ATTR_IFINDEX | NEIGH_ATTR_DST | NEIGH_ATTR_FAMILY),
};