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tg3: Fix data corruption on 5725 with TSO 

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@vger.kernel.org>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: Nithin Nayak Sujir <nsujir@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2013-05-13 11:04:16 +00:00 committed by David S. Miller
parent 44f3b503c1
commit 0f0d15100a
1 changed files with 17 additions and 0 deletions
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17
drivers/net/ethernet/broadcom/tg3.c
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@ -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;
}
/* Test for DMA addresses > 40-bit */
static inline int tg3_40bit_overflow_test(struct tg3 *tp, dma_addr_t mapping,
int len)
@ -7484,6 +7498,9 @@ static bool tg3_tx_frag_set(struct tg3_napi *tnapi, u32 *entry, u32 *budget,
if (tg3_4g_overflow_test(map, len))
hwbug = true;
if (tg3_4g_tso_overflow_test(tp, map, len, mss))
hwbug = true;
if (tg3_40bit_overflow_test(tp, map, len))
hwbug = true;