linux-kernel - [PATCH 4.19 23/67] net: aquantia: fix rx checksum offload bits

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Date:   Thu, 20 Dec 2018 10:18:35 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Igor Russkikh <igor.russkikh@...antia.com>,
        Dmitry Bogdanov <dmitry.bogdanov@...antia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 23/67] net: aquantia: fix rx checksum offload bits

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 37c4b91f955fdd5f4ad771956b97d35f1321098e ]

The last set of csum offload fixes had a leak:

Checksum enabled status bits from rx descriptor were incorrectly
interpreted. Consequently all the other valid logic worked on zero bits.
That caused rx checksum offloads never to trigger.

Tested by dumping rx descriptors and validating resulting csum_level.

Reported-by: Igor Russkikh <igor.russkikh@...antia.com>
Signed-off-by: Dmitry Bogdanov <dmitry.bogdanov@...antia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@...antia.com>
Fixes: ad703c2b9127f ("net: aquantia: invalid checksumm offload implementation")
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c
index 88705dee5b95..56363ff5c891 100644
--- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c
+++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c
@@ -667,7 +667,7 @@ static int hw_atl_b0_hw_ring_rx_receive(struct aq_hw_s *self,
 
 		rx_stat = (0x0000003CU & rxd_wb->status) >> 2;
 
-		is_rx_check_sum_enabled = (rxd_wb->type) & (0x3U << 19);
+		is_rx_check_sum_enabled = (rxd_wb->type >> 19) & 0x3U;
 
 		pkt_type = 0xFFU & (rxd_wb->type >> 4);
 
-- 
2.19.1