Subject: [PATCH net-next-2.6] udp: Optimise multicast reception

From: Eric Dumazet <[email-masked]>
Date: Fri, 06 Nov 2009 16:59:51 +0100

Eric Dumazet a écrit :

> Yes, but this single skb freeing is in multicast very slow path
> (it happens if we receive a multicast packet with no listener, which should
>  not happen with multicast aware network...)
> 
> 
> If you really want to optimize this part, we could use an array of
> 32 (or 64) socket pointers, to be able to perform the really expensive
> work (skb_clone(), udp_queue_rcv_skb()) outside of the lock.
> 
> Something like this untested patch :

I did some tests and made one fix.

With this kind of stacking, we eventually could try a rcu lookup as well.

[PATCH net-next-2.6] udp: Optimise multicast reception

UDP multicast rx path is a bit complex and can hold a spinlock
for a long time.

Using a small (32 or 64 entries) stack of socket pointers can help
to perform expensive operations (skb_clone(), udp_queue_rcv_skb())
outside of the lock, in most cases.

Signed-off-by: Eric Dumazet <[email-masked]>
---
 net/ipv4/udp.c |   70 ++++++++++++++++++++++++++++++-----------------
 1 files changed, 46 insertions(+), 24 deletions(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index d5e75e9..89637d0 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1190,6 +1190,24 @@ drop:
 	return -1;
 }
 
+
+static void flush_stack(struct sock **stack, unsigned int count,
+			struct sk_buff *skb, unsigned int final)
+{
+	unsigned int i;
+	struct sk_buff *skb1 = NULL;
+
+	for (i = 0; i < count; i++) {
+		if (likely(skb1 == NULL))
+			skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
+
+		if (skb1 && udp_queue_rcv_skb(stack[i], skb1) <= 0)
+			skb1 = NULL;
+	}
+	if (skb1)
+		consume_skb(skb1);
+}
+
 /*
  *	Multicasts and broadcasts go to each listener.
  *
@@ -1201,38 +1219,42 @@ static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
 				    __be32 saddr, __be32 daddr,
 				    struct udp_table *udptable)
 {
-	struct sock *sk;
+	struct sock *sk, *stack[256 / sizeof(struct sock *)];
 	struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
 	int dif;
+	unsigned int i, count = 0;
 
 	spin_lock(&hslot->lock);
 	sk = sk_nulls_head(&hslot->head);
 	dif = skb->dev->ifindex;
 	sk = udp_v4_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
-	if (sk) {
-		struct sock *sknext = NULL;
-
-		do {
-			struct sk_buff *skb1 = skb;
-
-			sknext = udp_v4_mcast_next(net, sk_nulls_next(sk), uh->dest,
-						   daddr, uh->source, saddr,
-						   dif);
-			if (sknext)
-				skb1 = skb_clone(skb, GFP_ATOMIC);
-
-			if (skb1) {
-				int ret = udp_queue_rcv_skb(sk, skb1);
-				if (ret > 0)
-					/* we should probably re-process instead
-					 * of dropping packets here. */
-					kfree_skb(skb1);
-			}
-			sk = sknext;
-		} while (sknext);
-	} else
-		consume_skb(skb);
+	while (sk) {
+		stack[count++] = sk;
+		sk = udp_v4_mcast_next(net, sk_nulls_next(sk), uh->dest,
+				       daddr, uh->source, saddr, dif);
+		if (unlikely(count == ARRAY_SIZE(stack))) {
+			if (!sk)
+				break;
+			flush_stack(stack, count, skb, ~0);
+			count = 0;
+		}
+
+	}
+	/*
+	 * before releasing the lock, we must take reference on sockets
+	 */
+	for (i = 0; i < count; i++)
+		sock_hold(stack[i]);
+
 	spin_unlock(&hslot->lock);
+
+	/*
+	 * do the slow work with no lock held
+	 */
+	flush_stack(stack, count, skb, count - 1);
+
+	for (i = 0; i < count; i++)
+		sock_put(stack[i]);
 	return 0;
 }