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authorOctavian Purdila <opurdila@ixiacom.com>2009-12-26 11:51:04 +0000
committerDavid S. Miller <davem@davemloft.net>2009-12-26 20:43:57 -0800
commit6d2e3ea284463d5ab34e9cf2a41d0b8627b95d02 (patch)
tree86ee780b06adfe388ac64dd66ece598be69b29ec
parent0f7b67dd9e1192976f5e5a78934c7a339ff7c45f (diff)
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llc: use a device based hash table to speed up multicast delivery
This patch adds a per SAP device based hash table to solve the multicast delivery scalability issue when we have large number of interfaces and a large number of sockets bound to the same SAP. Signed-off-by: Octavian Purdila <opurdila@ixiacom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/net/llc.h11
-rw-r--r--include/net/llc_conn.h1
-rw-r--r--net/llc/llc_conn.c10
-rw-r--r--net/llc/llc_sap.c8
4 files changed, 27 insertions, 3 deletions
diff --git a/include/net/llc.h b/include/net/llc.h
index 1559cf10e874..dbef5917905b 100644
--- a/include/net/llc.h
+++ b/include/net/llc.h
@@ -32,6 +32,9 @@ struct llc_addr {
#define LLC_SAP_STATE_INACTIVE 1
#define LLC_SAP_STATE_ACTIVE 2
+#define LLC_SK_DEV_HASH_BITS 6
+#define LLC_SK_DEV_HASH_ENTRIES (1<<LLC_SK_DEV_HASH_BITS)
+
/**
* struct llc_sap - Defines the SAP component
*
@@ -56,8 +59,16 @@ struct llc_sap {
struct list_head node;
spinlock_t sk_lock;
struct hlist_nulls_head sk_list;
+ struct hlist_head sk_dev_hash[LLC_SK_DEV_HASH_ENTRIES];
};
+static inline
+struct hlist_head *llc_sk_dev_hash(struct llc_sap *sap, int ifindex)
+{
+ return &sap->sk_dev_hash[ifindex % LLC_SK_DEV_HASH_ENTRIES];
+}
+
+
#define LLC_DEST_INVALID 0 /* Invalid LLC PDU type */
#define LLC_DEST_SAP 1 /* Type 1 goes here */
#define LLC_DEST_CONN 2 /* Type 2 goes here */
diff --git a/include/net/llc_conn.h b/include/net/llc_conn.h
index fe982fd94c4a..2f97d8ddce92 100644
--- a/include/net/llc_conn.h
+++ b/include/net/llc_conn.h
@@ -77,6 +77,7 @@ struct llc_sock {
received and caused sending FRMR.
Used for resending FRMR */
u32 cmsg_flags;
+ struct hlist_node dev_hash_node;
};
static inline struct llc_sock *llc_sk(const struct sock *sk)
diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c
index 77bb3816655e..10cdfe2db830 100644
--- a/net/llc/llc_conn.c
+++ b/net/llc/llc_conn.c
@@ -682,10 +682,15 @@ static int llc_find_offset(int state, int ev_type)
*/
void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk)
{
+ struct llc_sock *llc = llc_sk(sk);
+ struct hlist_head *dev_hb = llc_sk_dev_hash(sap, llc->dev->ifindex);
+
llc_sap_hold(sap);
- spin_lock_bh(&sap->sk_lock);
llc_sk(sk)->sap = sap;
+
+ spin_lock_bh(&sap->sk_lock);
sk_nulls_add_node_rcu(sk, &sap->sk_list);
+ hlist_add_head(&llc->dev_hash_node, dev_hb);
spin_unlock_bh(&sap->sk_lock);
}
@@ -699,8 +704,11 @@ void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk)
*/
void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk)
{
+ struct llc_sock *llc = llc_sk(sk);
+
spin_lock_bh(&sap->sk_lock);
sk_nulls_del_node_init_rcu(sk);
+ hlist_del(&llc->dev_hash_node);
spin_unlock_bh(&sap->sk_lock);
llc_sap_put(sap);
}
diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c
index 94790e60d072..94cb706f6cc4 100644
--- a/net/llc/llc_sap.c
+++ b/net/llc/llc_sap.c
@@ -387,10 +387,14 @@ static void llc_sap_mcast(struct llc_sap *sap,
{
int i = 0, count = 256 / sizeof(struct sock *);
struct sock *sk, *stack[count];
- struct hlist_nulls_node *node;
+ struct hlist_node *node;
+ struct llc_sock *llc;
+ struct hlist_head *dev_hb = llc_sk_dev_hash(sap, skb->dev->ifindex);
spin_lock_bh(&sap->sk_lock);
- sk_nulls_for_each_rcu(sk, node, &sap->sk_list) {
+ hlist_for_each_entry(llc, node, dev_hb, dev_hash_node) {
+
+ sk = &llc->sk;
if (!llc_mcast_match(sap, laddr, skb, sk))
continue;