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bridge: set priority of STP packets

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Spanning Tree Protocol packets should have always been marked as
control packets, this causes them to get queued in the high prirority
FIFO. As Radia Perlman mentioned in her LCA talk, STP dies if bridge
gets overloaded and can't communicate. This is a long-standing bug back
to the first versions of Linux bridge.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 547b4e7181)
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Stephen Hemminger 2013-02-11 08:22:22 +00:00 committed by Willy Tarreau
parent 6f96a94d97
commit 48bff07f50
1 changed files with 2 additions and 0 deletions
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2
net/bridge/br_stp_bpdu.c
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@ -15,6 +15,7 @@
#include <linux/netfilter_bridge.h>
#include <linux/etherdevice.h>
#include <linux/llc.h>
#include <linux/pkt_sched.h>
#include <net/net_namespace.h>
#include <net/llc.h>
#include <net/llc_pdu.h>
@ -39,6 +40,7 @@ static void br_send_bpdu(struct net_bridge_port *p,
skb->dev = p->dev;
skb->protocol = htons(ETH_P_802_2);
skb->priority = TC_PRIO_CONTROL;
skb_reserve(skb, LLC_RESERVE);
memcpy(__skb_put(skb, length), data, length);