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Commit 47a0489c authored by Bob Copeland's avatar Bob Copeland Committed by Johannes Berg
Browse files

mac80211: mesh: use hlist for rmc cache 



The RMC cache has 256 list heads plus a u32, which puts it at the
unfortunate size of 4104 bytes with padding.  kmalloc() will then
round this up to the next power-of-two, so we wind up actually
using two pages here where most of the second is wasted.

Switch to hlist heads here to reduce the structure size down to
fit within a page.

Signed-off-by: default avatarBob Copeland <me@bobcopeland.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 0aa7fabb

net/mac80211/mesh.c

+10 −8
Original line number Diff line number Diff line
@@ -174,22 +174,23 @@ int mesh_rmc_init(struct ieee80211_sub_if_data *sdata) 
		return -ENOMEM;

	sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;

	for (i = 0; i < RMC_BUCKETS; i++)

		INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);

		INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);

	return 0;

}



void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)

{

	struct mesh_rmc *rmc = sdata->u.mesh.rmc;

	struct rmc_entry *p, *n;

	struct rmc_entry *p;

	struct hlist_node *n;

	int i;



	if (!sdata->u.mesh.rmc)

		return;



	for (i = 0; i < RMC_BUCKETS; i++) {

		list_for_each_entry_safe(p, n, &rmc->bucket[i], list) {

			list_del(&p->list);

		hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {

			hlist_del(&p->list);

			kmem_cache_free(rm_cache, p);

		}

	}
@@ -218,7 +219,8 @@ int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, 
	u32 seqnum = 0;

	int entries = 0;

	u8 idx;

	struct rmc_entry *p, *n;

	struct rmc_entry *p;

	struct hlist_node *n;



	if (!rmc)

		return -1;
@@ -226,11 +228,11 @@ int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, 
	/* Don't care about endianness since only match matters */

	memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));

	idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;

	list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {

	hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {

		++entries;

		if (time_after(jiffies, p->exp_time) ||

		    entries == RMC_QUEUE_MAX_LEN) {

			list_del(&p->list);

			hlist_del(&p->list);

			kmem_cache_free(rm_cache, p);

			--entries;

		} else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
@@ -244,7 +246,7 @@ int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, 
	p->seqnum = seqnum;

	p->exp_time = jiffies + RMC_TIMEOUT;

	memcpy(p->sa, sa, ETH_ALEN);

	list_add(&p->list, &rmc->bucket[idx]);

	hlist_add_head(&p->list, &rmc->bucket[idx]);

	return 0;

}

net/mac80211/mesh.h

+2 −2
Original line number Diff line number Diff line
@@ -158,14 +158,14 @@ struct mesh_table { 
 * that are found in the cache.

 */

struct rmc_entry {

	struct list_head list;

	struct hlist_node list;

	u32 seqnum;

	unsigned long exp_time;

	u8 sa[ETH_ALEN];

};



struct mesh_rmc {

	struct list_head bucket[RMC_BUCKETS];

	struct hlist_head bucket[RMC_BUCKETS];

	u32 idx_mask;

};