linux-kernel - [PATCH 3.16 26/55] macvlan: allow to enqueue broadcast pkt on virtual device

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Message-Id: <20141013022444.879115350@linuxfoundation.org>
Date:	Mon, 13 Oct 2014 04:24:40 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Herbert Xu <herbert@...dor.apana.org.au>,
	Thibaut Collet <thibaut.collet@...nd.com>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.16 26/55] macvlan: allow to enqueue broadcast pkt on virtual device

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Nicolas Dichtel <nicolas.dichtel@...nd.com>

[ Upstream commit 07d92d5cc977a7fe1e683e1d4a6f723f7f2778cb ]

Since commit 412ca1550cbe ("macvlan: Move broadcasts into a work queue"), the
driver uses tx_queue_len of the master device as the limit of packets enqueuing.
Problem is that virtual drivers have this value set to 0, thus all broadcast
packets were rejected.
Because tx_queue_len was arbitrarily chosen, I replace it with a static limit
of 1000 (also arbitrarily chosen).

CC: Herbert Xu <herbert@...dor.apana.org.au>
Reported-by: Thibaut Collet <thibaut.collet@...nd.com>
Suggested-by: Thibaut Collet <thibaut.collet@...nd.com>
Tested-by: Thibaut Collet <thibaut.collet@...nd.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/macvlan.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -36,6 +36,7 @@
 #include <linux/netpoll.h>
 
 #define MACVLAN_HASH_SIZE	(1 << BITS_PER_BYTE)
+#define MACVLAN_BC_QUEUE_LEN	1000
 
 struct macvlan_port {
 	struct net_device	*dev;
@@ -248,7 +249,7 @@ static void macvlan_broadcast_enqueue(st
 		goto err;
 
 	spin_lock(&port->bc_queue.lock);
-	if (skb_queue_len(&port->bc_queue) < skb->dev->tx_queue_len) {
+	if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
 		__skb_queue_tail(&port->bc_queue, nskb);
 		err = 0;
 	}


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