macvlan: don't broadcast PAUSE frames to macvlan devices

[Patrick McHardy <kaber@trash.net>]

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commit 19e521e49972878b133cb1449a5ac38052d36f3d
Author: Patrick McHardy <kaber@trash.net>
Date:   Wed Nov 26 11:48:09 2008 +0100

    macvlan: don't broadcast PAUSE frames to macvlan devices
    
    PAUSE frames are only relevant for the real device, broadcasting them
    to all macvlan devices can cause a significant load increase.
    
    Reported-by: Ben Greear <greearb@candelatech.com>
    Tested-by: Ben Greear <greearb@candelatech.com>
    Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index e887921..7e24b50 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -70,6 +70,9 @@ static void macvlan_broadcast(struct sk_buff *skb,
 	struct sk_buff *nskb;
 	unsigned int i;
 
+	if (skb->protocol == htons(ETH_P_PAUSE))
+		return;
+
 	for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
 		hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
 			dev = vlan->dev;