netdev - Re: [PATCH 3/3] drivers/net/ixgbe/ixgbe_main.c: get tx queue mapping specified in socket

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Date:	Wed, 15 Dec 2010 12:54:17 -0800
From:	John Fastabend <john.r.fastabend@...el.com>
To:	"Yu, Fenghua" <fenghua.yu@...el.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"Tang, Xinan" <xinan.tang@...el.com>,
	Junchang Wang <junchangwang@...il.com>,
	netdev <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] drivers/net/ixgbe/ixgbe_main.c: get tx queue mapping
 specified in socket

On 12/15/2010 12:02 PM, Yu, Fenghua wrote:
> From: Fenghua Yu <fenghua.yu@...el.com>
> 
> Instead of using calculated tx queue mapping, this patch selects tx queue mapping
> which is specified in socket.
> 
> By doing this, tx queue mapping can be bigger than the number of cores and
> stressfully use multiqueue TSS. Or application can specify some of cores/queues
> to send packets and implement flexible load balance policies.
> 
> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
> Signed-off-by: Junchang Wang <junchangwang@...il.com>
> Signed-off-by: Xinan Tang <xinan.tang@...el.com>
> ---
>  drivers/net/ixgbe/ixgbe_main.c |    9 ++++++++-
>  1 files changed, 8 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
> index eee0b29..4d98928 100644
> --- a/drivers/net/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ixgbe/ixgbe_main.c
> @@ -6255,7 +6255,14 @@ static int ixgbe_maybe_stop_tx(struct net_device *netdev,
>  static u16 ixgbe_select_queue(struct net_device *dev, struct sk_buff *skb)
>  {
>  	struct ixgbe_adapter *adapter = netdev_priv(dev);
> -	int txq = smp_processor_id();
> +	int txq;
> +
> +	txq = sk_tx_queue_get(skb->sk);
> +
> +	if (txq >= 0 && txq < dev->real_num_tx_queues)
> +		return txq;
> +
> +	txq = smp_processor_id();
>  #ifdef IXGBE_FCOE
>  	__be16 protocol;
>  

We are trying to remove stuff from select_queue not add it. I believe however you solve this problem should be generic and not specific to ixgbe.

Thanks,
John.
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