netdev - Re: [PATCH 3/3] ixgb: increase skb size to prevent dma over skb boundary

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Date:	Mon, 7 Dec 2009 12:54:40 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Neil Horman <nhorman@...driver.com>
Cc:	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net,
	davem@...emloft.net, jesse.brandeburg@...el.com,
	bruce.w.allan@...el.com, peter.p.waskiewicz.jr@...el.com,
	john.ronciak@...el.com
Subject: Re: [PATCH 3/3] ixgb: increase skb size to prevent dma over skb 
	boundary

On Mon, Dec 7, 2009 at 06:49, Neil Horman <nhorman@...driver.com> wrote:
> Update xgb driver to not allow dma beyond the end of the allocated skb
>
> Signed-off-by: Neil Horman <nhorman@...driver.com>
>
> ixgb_main.c |   13 +++++++++----
> 1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
> index bcd0f01..2d8e699 100644
> --- a/drivers/net/ixgb/ixgb_main.c
> +++ b/drivers/net/ixgb/ixgb_main.c
> @@ -798,14 +798,19 @@ ixgb_setup_rctl(struct ixgb_adapter *adapter)
>
>        rctl |= IXGB_RCTL_SECRC;
>
> -       if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
> +       if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048) {
>                rctl |= IXGB_RCTL_BSIZE_2048;
> -       else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
> +               adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
> +       } else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096) {
>                rctl |= IXGB_RCTL_BSIZE_4096;
> -       else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
> +               adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
> +       } else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192) {
>                rctl |= IXGB_RCTL_BSIZE_8192;
> -       else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
> +               adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
> +       } else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384) {
>                rctl |= IXGB_RCTL_BSIZE_16384;
> +               adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
> +       }
>
>        IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
>  }
> --

I have added this patch to my queue of ixgb patches for
reveiw/testing.  Upon successful review/testing I will submit to
Dave/netdev.

-- 
Cheers,
Jeff
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