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net: sched: cls_u32: clean tc_u_common hashtable

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* calculate key *once*, not for each hash chain element
* let tc_u_hash() return the pointer to chain head rather than index -
callers are cleaner that way.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Al Viro 2018-10-08 06:22:39 -04:00 committed by David S. Miller
parent 07743ca5c9
commit 4895c42f62
1 changed files with 9 additions and 15 deletions
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24
net/sched/cls_u32.c
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@ -343,19 +343,16 @@ static void *tc_u_common_ptr(const struct tcf_proto *tp)
return block->q;
}
static unsigned int tc_u_hash(const struct tcf_proto *tp)
static struct hlist_head *tc_u_hash(void *key)
{
return hash_ptr(tc_u_common_ptr(tp), U32_HASH_SHIFT);
return tc_u_common_hash + hash_ptr(key, U32_HASH_SHIFT);
}
static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
static struct tc_u_common *tc_u_common_find(void *key)
{
struct tc_u_common *tc;
unsigned int h;
h = tc_u_hash(tp);
hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) {
if (tc->ptr == tc_u_common_ptr(tp))
hlist_for_each_entry(tc, tc_u_hash(key), hnode) {
if (tc->ptr == key)
return tc;
}
return NULL;
@ -364,10 +361,8 @@ static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
static int u32_init(struct tcf_proto *tp)
{
struct tc_u_hnode *root_ht;
struct tc_u_common *tp_c;
unsigned int h;
tp_c = tc_u_common_find(tp);
void *key = tc_u_common_ptr(tp);
struct tc_u_common *tp_c = tc_u_common_find(key);
root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
if (root_ht == NULL)
@ -385,12 +380,11 @@ static int u32_init(struct tcf_proto *tp)
kfree(root_ht);
return -ENOBUFS;
}
tp_c->ptr = tc_u_common_ptr(tp);
tp_c->ptr = key;
INIT_HLIST_NODE(&tp_c->hnode);
idr_init(&tp_c->handle_idr);
h = tc_u_hash(tp);
hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]);
hlist_add_head(&tp_c->hnode, tc_u_hash(key));
}
tp_c->refcnt++;