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Message-ID: <1307130531.2600.8.camel@edumazet-laptop>
Date: Fri, 03 Jun 2011 21:48:51 +0200
From: Eric Dumazet <eric.dumazet@...il.com>
To: Neil Horman <nhorman@...driver.com>
Cc: netdev@...r.kernel.org, Jay Vosburgh <fubar@...ibm.com>,
Andy Gospodarek <andy@...yhouse.net>,
"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] bonding: reset queue mapping prior to transmission to
physical device (v4)
Le vendredi 03 juin 2011 à 15:24 -0400, Neil Horman a écrit :
> The bonding driver is multiqueue enabled, in which each queue represents a slave
> to enable optional steering of output frames to given slaves against the default
> output policy. However, it needs to reset the skb->queue_mapping prior to
> queuing to the physical device or the physical slave (if it is multiqueue) could
> wind up transmitting on an unintended tx queue
>
> Change Notes:
> v2) Based on first pass review, updated the patch to restore the origional queue
> mapping that was found in bond_select_queue, rather than simply resetting to
> zero. This preserves the value of queue_mapping when it was set on receive in
> the forwarding case which is desireable.
>
> v3) Fixed spelling an casting error in skb->cb
>
> v4) fixed to store raw queue_mapping to avoid double decrement
>
> Signed-off-by: Neil Horman <nhorman@...driver.com>
> CC: Jay Vosburgh <fubar@...ibm.com>
> CC: Andy Gospodarek <andy@...yhouse.net>
> CC: "David S. Miller" <davem@...emloft.net>
> ---
> drivers/net/bonding/bond_main.c | 8 ++++++++
> 1 files changed, 8 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index 17b4dd9..76adf27 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -400,6 +400,9 @@ int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
> {
> skb->dev = slave_dev;
> skb->priority = 1;
> +
> + skb->queue_mapping = ((u16 *)skb->cb)[0];
Please dont do that. Use a helper.
For example :
#define bond_queue_mapping(skb) (*(unsigned int *)((skb)->cb))
skb->queue_mapping = bond_queue_mapping(skb);
> +
> if (unlikely(netpoll_tx_running(slave_dev)))
> bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
> else
> @@ -4216,6 +4219,11 @@ static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
> */
> u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
>
> + /*
> + * Save the original txq to restore before passing to the driver
> + */
> + ((u16 *)skb->cb)[0] = skb->queue_mapping;
bond_queue_mapping(skb) = skb->queue_mapping;
> +
> if (unlikely(txq >= dev->real_num_tx_queues)) {
> do {
> txq -= dev->real_num_tx_queues;
--
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