net: mvneta: fix improper tx queue usage in mvneta_tx()

From 4f2069c92a27790e6071dc2a80f92c166e0b0ca4 Mon Sep 17 00:00:00 2001
From: Willy Tarreau <w@1wt.eu>
Date: Thu, 11 Apr 2013 23:00:37 +0200
Subject: net: mvneta: fix improper tx queue usage in mvneta_tx()

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@1wt.eu>
Cc: Dmitri Epshtein <dima@marvell.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Gregory CLEMENT <gregory.clement@free-electrons.com>
Cc: Ben Hutchings <bhutchings@solarflare.com>
---
 drivers/net/ethernet/marvell/mvneta.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

Hi Willy

On 04/15/2013 08:35 AM, Willy Tarreau wrote:
> From 4f2069c92a27790e6071dc2a80f92c166e0b0ca4 Mon Sep 17 00:00:00 2001
> From: Willy Tarreau <w@1wt.eu>
> Date: Thu, 11 Apr 2013 23:00:37 +0200
> Subject: net: mvneta: fix improper tx queue usage in mvneta_tx()
> 
> 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.

Thanks for this work. I have tested on a DB-MV784MP-GP board in SMP
with 4 CPUs. Without this patch a "iperf -P 4" lead to a kernel crash
in 80% of the case and to a hang in the remaining cases. Now after
a dozen of tests on this board, I didn't see any crash or hang.
You can add my
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

Thanks,

> 
> Signed-off-by: Willy Tarreau <w@1wt.eu>
> Cc: Dmitri Epshtein <dima@marvell.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> Cc: Gregory CLEMENT <gregory.clement@free-electrons.com>
> Cc: Ben Hutchings <bhutchings@solarflare.com>
> ---
>  drivers/net/ethernet/marvell/mvneta.c | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
> index 1e628ce..a47a097 100644
> --- a/drivers/net/ethernet/marvell/mvneta.c
> +++ b/drivers/net/ethernet/marvell/mvneta.c
> @@ -374,7 +374,6 @@ 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"
> @@ -1475,7 +1474,8 @@ 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;
> @@ -1485,7 +1485,7 @@ static int mvneta_tx(struct sk_buff *skb, struct net_device *dev)
>  		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);
> @@ -2689,7 +2689,7 @@ static int mvneta_probe(struct platform_device *pdev)
>  		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);
>

On Mon, Apr 15, 2013 at 01:50:37PM +0200, Gregory CLEMENT wrote:
> Hi Willy
> 
> On 04/15/2013 08:35 AM, Willy Tarreau wrote:
> > From 4f2069c92a27790e6071dc2a80f92c166e0b0ca4 Mon Sep 17 00:00:00 2001
> > From: Willy Tarreau <w@1wt.eu>
> > Date: Thu, 11 Apr 2013 23:00:37 +0200
> > Subject: net: mvneta: fix improper tx queue usage in mvneta_tx()
> > 
> > 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.
> 
> Thanks for this work. I have tested on a DB-MV784MP-GP board in SMP
> with 4 CPUs. Without this patch a "iperf -P 4" lead to a kernel crash
> in 80% of the case and to a hang in the remaining cases. Now after
> a dozen of tests on this board, I didn't see any crash or hang.
> You can add my
> Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

Thanks for testing Gregory !

Willy

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From: Willy Tarreau <w@1wt.eu>
Date: Mon, 15 Apr 2013 08:35:37 +0200

> From 4f2069c92a27790e6071dc2a80f92c166e0b0ca4 Mon Sep 17 00:00:00 2001
> From: Willy Tarreau <w@1wt.eu>
> Date: Thu, 11 Apr 2013 23:00:37 +0200
> Subject: net: mvneta: fix improper tx queue usage in mvneta_tx()
> 
> 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@1wt.eu>

Applied.
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