On Mon, 2013-05-13 at 14:04 -0700, Nithin Nayak Sujir wrote:
> From: Michael Chan <mchan@xxxxxxxxxxxx>
>
> The 5725 family of devices (asic rev 5762), corrupts TSO packets where
> the buffer is within MSS bytes of a 4G boundary (4G, 8G etc.). Detect
> this condition and trigger the workaround path.
>
> Cc: <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Michael Chan <mchan@xxxxxxxxxxxx>
> Signed-off-by: Nithin Nayak Sujir <nsujir@xxxxxxxxxxxx>
> ---
> drivers/net/ethernet/broadcom/tg3.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
> index 781be76..e285d76 100644
> --- a/drivers/net/ethernet/broadcom/tg3.c
> +++ b/drivers/net/ethernet/broadcom/tg3.c
> @@ -7448,6 +7448,20 @@ static inline int tg3_4g_overflow_test(dma_addr_t mapping, int len)
> return (base > 0xffffdcc0) && (base + len + 8 < base);
> }
>
> +/* Test for TSO DMA buffers that cross into regions which are within MSS bytes
> + * of any 4GB boundaries: 4G, 8G, etc
> + */
> +static inline int tg3_4g_tso_overflow_test(struct tg3 *tp, dma_addr_t mapping,
> + u32 len, u32 mss)
> +{
> + if (tg3_asic_rev(tp) == ASIC_REV_5762 && mss) {
> + u32 base = (u32) mapping & 0xffffffff;
> +
> + return ((base + len + (mss & 0x3fff)) < base);
> + }
> + return 0;
> +}
> +
I am curious : Does this condition even triggers ?
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