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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>
This commit is contained in:
Octavian Purdila 2009-12-26 11:51:03 +00:00 committed by David S. Miller
parent b76f5a8427
commit 0f7b67dd9e
1 changed files with 28 additions and 8 deletions
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36
net/llc/llc_sap.c
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@ -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);
}