netdev - Re: [PATCH] chelsio: use netdev_alloc

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Date:	Wed, 20 Mar 2013 11:42:32 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] chelsio: use netdev_alloc_skb

On Wed, 2013-03-20 at 11:30 -0700, Stephen Hemminger wrote:
> This extends on Eric's patch. It uses netdev_alloc_skb which fixes a couple of
> other issues.
>   * driver was never setting skb->dev on the received buffer
>   * copybreak allocation wasn't padding buffer
>   * copybreak assumed that ip alignment padding was always 2 (it is platform dependent)
> 
> Compile tested only, don't have this hardware.
> 
> Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
> 
> 
> --- a/drivers/net/ethernet/chelsio/cxgb/sge.c	2013-03-20 11:13:47.950986878 -0700
> +++ b/drivers/net/ethernet/chelsio/cxgb/sge.c	2013-03-20 11:24:26.942722757 -0700
> @@ -835,7 +835,7 @@ static void refill_free_list(struct sge
>  		struct sk_buff *skb;
>  		dma_addr_t mapping;
>  
> -		skb = dev_alloc_skb(q->rx_buffer_size);
> +		skb = netdev_alloc_skb(sge->netdev, q->rx_buffer_size);
>  		if (!skb)
>  			break;

Well, this (skb->dev = dev) is done in eth_type_trans()

Many drivers use dev_alloc_skb(), I am not sure we really want to change
them.





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