Re: [PATCH net] tg3: Expand 4g_overflow_test workaround to skb fragments of any size.

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On 12/19/2013 04:41 PM, Eric Dumazet wrote:
On Thu, 2013-12-19 at 16:24 -0800, Nithin Nayak Sujir wrote:
The current driver assumes that an skb fragment can only be upto jumbo
size. Presumably this was a fast-path optimization. This assumption is
no longer true as fragments can be upto 32k.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Nithin Nayak Sujir <nsujir@xxxxxxxxxxxx>
Signed-off-by: Michael Chan <mchan@xxxxxxxxxxxx>
---
  drivers/net/ethernet/broadcom/tg3.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index f3dd93b..8ab21d7 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -7622,7 +7622,7 @@ static inline int tg3_4g_overflow_test(dma_addr_t mapping, int len)
  {
  	u32 base = (u32) mapping & 0xffffffff;

-	return (base > 0xffffdcc0) && (base + len + 8 < base);
+	return (base + len + 8 < base);
  }

  /* Test for TSO DMA buffers that cross into regions which are within MSS bytes

btw this is also :

return base + len + 8 < base;




I'll send a v2.

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