This is a note to let you know that I've just added the patch titled
net: mvneta: fix improper tx queue usage in mvneta_tx()
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-mvneta-fix-improper-tx-queue-usage-in-mvneta_tx.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 16de7d010ca855f01e129ce7e1e12e19522a24c5 Mon Sep 17 00:00:00 2001
From: Willy Tarreau <w@xxxxxx>
Date: Thu, 11 Apr 2013 23:00:37 +0200
Subject: net: mvneta: fix improper tx queue usage in mvneta_tx()
From: Willy Tarreau <w@xxxxxx>
[ Upstream commit ee40a116ebf139f900c3d2e6febb8388738e96d0 ]
mvneta_tx() was using a static tx queue number causing crashes as
soon as a little bit of traffic was sent via the interface, because
it is normally expected that the same queue should be used as in
dev_queue_xmit().
As suggested by Ben Hutchings, let's use skb_get_queue_mapping() to
get the proper Tx queue number, and use alloc_etherdev_mqs() instead
of alloc_etherdev_mq() to create the queues.
Both my Mirabox and my OpenBlocks AX3 used to crash without this patch
and don't anymore with it. The issue appeared in 3.8 but became more
visible after the fix allowing GSO to be enabled.
Original work was done by Dmitri Epshtein and Thomas Petazzoni. I
just adapted it to take care of Ben's comments.
Signed-off-by: Willy Tarreau <w@xxxxxx>
Cc: Dmitri Epshtein <dima@xxxxxxxxxxx>
Cc: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
Cc: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
Cc: Ben Hutchings <bhutchings@xxxxxxxxxxxxxx>
Tested-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/marvell/mvneta.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -375,7 +375,6 @@ static int rxq_number = 8;
static int txq_number = 8;
static int rxq_def;
-static int txq_def;
#define MVNETA_DRIVER_NAME "mvneta"
#define MVNETA_DRIVER_VERSION "1.0"
@@ -1476,7 +1475,8 @@ error:
static int mvneta_tx(struct sk_buff *skb, struct net_device *dev)
{
struct mvneta_port *pp = netdev_priv(dev);
- struct mvneta_tx_queue *txq = &pp->txqs[txq_def];
+ u16 txq_id = skb_get_queue_mapping(skb);
+ struct mvneta_tx_queue *txq = &pp->txqs[txq_id];
struct mvneta_tx_desc *tx_desc;
struct netdev_queue *nq;
int frags = 0;
@@ -1486,7 +1486,7 @@ static int mvneta_tx(struct sk_buff *skb
goto out;
frags = skb_shinfo(skb)->nr_frags + 1;
- nq = netdev_get_tx_queue(dev, txq_def);
+ nq = netdev_get_tx_queue(dev, txq_id);
/* Get a descriptor for the first part of the packet */
tx_desc = mvneta_txq_next_desc_get(txq);
@@ -2690,7 +2690,7 @@ static int mvneta_probe(struct platform_
return -EINVAL;
}
- dev = alloc_etherdev_mq(sizeof(struct mvneta_port), 8);
+ dev = alloc_etherdev_mqs(sizeof(struct mvneta_port), txq_number, rxq_number);
if (!dev)
return -ENOMEM;
@@ -2844,4 +2844,3 @@ module_param(rxq_number, int, S_IRUGO);
module_param(txq_number, int, S_IRUGO);
module_param(rxq_def, int, S_IRUGO);
-module_param(txq_def, int, S_IRUGO);
Patches currently in stable-queue which might be from w@xxxxxx are
queue-3.8/net-mvneta-fix-improper-tx-queue-usage-in-mvneta_tx.patch
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