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authorOctavian Purdila <opurdila@ixiacom.com>2009-12-26 11:51:03 +0000
committerDavid S. Miller <davem@davemloft.net>2009-12-26 20:42:29 -0800
commit0f7b67dd9e1192976f5e5a78934c7a339ff7c45f (patch)
tree123fd1196cea045dcd2b0e2870381f4949cd62db /net/llc
parentb76f5a8427ac2928c07fa4ff2144bb8db072c240 (diff)
llc: optimize multicast delivery
Optimize multicast delivery by doing the actual delivery without holding the lock. Based on the same approach used in UDP code. Signed-off-by: Octavian Purdila <opurdila@ixiacom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/llc')
-rw-r--r--net/llc/llc_sap.c36
1 files changed, 28 insertions, 8 deletions
diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c
index 39760d013ce2..94790e60d072 100644
--- a/net/llc/llc_sap.c
+++ b/net/llc/llc_sap.c
@@ -355,6 +355,24 @@ static inline bool llc_mcast_match(const struct llc_sap *sap,
llc->dev == skb->dev;
}
+static void llc_do_mcast(struct llc_sap *sap, struct sk_buff *skb,
+ struct sock **stack, int count)
+{
+ struct sk_buff *skb1;
+ int i;
+
+ for (i = 0; i < count; i++) {
+ skb1 = skb_clone(skb, GFP_ATOMIC);
+ if (!skb1) {
+ sock_put(stack[i]);
+ continue;
+ }
+
+ llc_sap_rcv(sap, skb1, stack[i]);
+ sock_put(stack[i]);
+ }
+}
+
/**
* llc_sap_mcast - Deliver multicast PDU's to all matching datagram sockets.
* @sap: SAP
@@ -367,25 +385,27 @@ static void llc_sap_mcast(struct llc_sap *sap,
const struct llc_addr *laddr,
struct sk_buff *skb)
{
- struct sock *sk;
+ int i = 0, count = 256 / sizeof(struct sock *);
+ struct sock *sk, *stack[count];
struct hlist_nulls_node *node;
spin_lock_bh(&sap->sk_lock);
sk_nulls_for_each_rcu(sk, node, &sap->sk_list) {
- struct sk_buff *skb1;
if (!llc_mcast_match(sap, laddr, skb, sk))
continue;
- skb1 = skb_clone(skb, GFP_ATOMIC);
- if (!skb1)
- break;
-
sock_hold(sk);
- llc_sap_rcv(sap, skb1, sk);
- sock_put(sk);
+ if (i < count)
+ stack[i++] = sk;
+ else {
+ llc_do_mcast(sap, skb, stack, i);
+ i = 0;
+ }
}
spin_unlock_bh(&sap->sk_lock);
+
+ llc_do_mcast(sap, skb, stack, i);
}

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