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net: aquantia: tcp checksum 0xffff being handled incorrectly

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Thats a known quirk in windows tcp stack it can produce 0xffff checksum.
Thats incorrect but it is.

Atlantic HW with LRO enabled handles that incorrectly and changes csum to
0xfffe - but indicates that csum is invalid. This causes driver to pass
packet to linux networking stack with CSUM_NONE, stack eventually drops
the packet.

There is a quirk in atlantic HW to enable correct processing of
0xffff incorrect csum. Enable it.

The visible bug is that windows link partner with software generated csums
caused TCP connection to be unstable since all packets that csum value
are dropped.

Reported-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Nikita Danilov <ndanilov@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikita Danilov 2019-05-25 09:58:05 +00:00 committed by David S. Miller
parent eaeb3b7494
commit 76f254d4af
1 changed files with 1 additions and 2 deletions
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3
drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c
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@ -266,12 +266,11 @@ static int hw_atl_b0_hw_offload_set(struct aq_hw_s *self,
*/
hw_atl_rpo_lro_max_coalescing_interval_set(self, 50);
hw_atl_rpo_lro_qsessions_lim_set(self, 1U);
hw_atl_rpo_lro_total_desc_lim_set(self, 2U);
hw_atl_rpo_lro_patch_optimization_en_set(self, 0U);
hw_atl_rpo_lro_patch_optimization_en_set(self, 1U);
hw_atl_rpo_lro_min_pay_of_first_pkt_set(self, 10U);