On Mon, 2013-05-13 at 14:34 -0700, Nithin Nayak Sujir wrote:
>
> On 05/13/2013 02:14 PM, Eric Dumazet wrote:
> >> +/* 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 ?
> >
>
> Yes, it's a rare problem to occur and was reported in our lab. After we
> implemented this fix, the problem didn't happen again.
>
I just cant figure out which part of the kernel could allocate a
fragment spanning a 4G region.
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