netdev - Re: [PATCH] net: sh_eth: fix skb_over

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Message-ID: <1328601310.2476.3.camel@edumazet-laptop>
Date:	Tue, 07 Feb 2012 08:55:10 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Shimoda, Yoshihiro" <yoshihiro.shimoda.uh@...esas.com>
Cc:	netdev@...r.kernel.org,
	Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>
Subject: Re: [PATCH] net: sh_eth: fix skb_over_panic happen

Le mardi 07 février 2012 à 15:54 +0900, Shimoda, Yoshihiro a écrit :
> When this GETHER controller received a large frame (about 1800 bytes
> or more), skb_over_panic() happened. This is because the previous
> driver set the RFLR to 0x1000 (4096 bytes) and the skb allocate size
> is smaller than 4096 bytes. So, the controller accepted such a frame.
> 
> The controller can discard a large frame by the RFLR setting.
> So, the patch modifies the value of RFLR to mtu + ETH_HLEN +
> ETH_FCS_LEN.
> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> ---
>  drivers/net/ethernet/renesas/sh_eth.c |    2 +-
>  drivers/net/ethernet/renesas/sh_eth.h |    3 ---
>  2 files changed, 1 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
> index 813d41c..9e899b0 100644
> --- a/drivers/net/ethernet/renesas/sh_eth.c
> +++ b/drivers/net/ethernet/renesas/sh_eth.c
> @@ -817,7 +817,7 @@ static int sh_eth_dev_init(struct net_device *ndev)
>  		sh_eth_write(ndev, 0, TRIMD);
> 
>  	/* Recv frame limit set register */
> -	sh_eth_write(ndev, RFLR_VALUE, RFLR);
> +	sh_eth_write(ndev, ndev->mtu + ETH_HLEN + ETH_FCS_LEN, RFLR);
> 

No VLAN_HDR ?



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