netdev - Re: [PATCH net v2 2/2] net: ethoc: Correctly pad short packets

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Message-ID: <20160712122440.GA19495@octofox.metropolis>
Date:	Tue, 12 Jul 2016 15:24:40 +0300
From:	Max Filippov <jcmvbkbc@...il.com>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	colin.king@...onical.com, tklauser@...tanz.ch,
	thierry.reding@...il.com
Subject: Re: [PATCH net v2 2/2] net: ethoc: Correctly pad short packets

Hi Florian,

On Mon, Jul 11, 2016 at 04:35:55PM -0700, Florian Fainelli wrote:
> Even though the hardware can be doing zero padding, we want the SKB to
> be going out on the wire with the appropriate size. This fixes packet
> truncations observed with e.g: ARP packets.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  drivers/net/ethernet/ethoc.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/net/ethernet/ethoc.c b/drivers/net/ethernet/ethoc.c
> index 06ae14a8e946..ca678d46c322 100644
> --- a/drivers/net/ethernet/ethoc.c
> +++ b/drivers/net/ethernet/ethoc.c
> @@ -860,6 +860,11 @@ static netdev_tx_t ethoc_start_xmit(struct sk_buff *skb, struct net_device *dev)
>  	unsigned int entry;
>  	void *dest;
>  
> +	if (skb_put_padto(skb, ETHOC_ZLEN)) {
> +		dev->stats.tx_errors++;
> +		goto out;
> +	}

skb_put_padto says that skb is freed on error, so this shoudn't go to
label 'out' on error where skb is freed again?

-- 
Thanks.
-- Max