linux-kernel - [PATCH 5.3 083/197] net: aquantia: do not pass lro session with invalid tcp checksum

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Message-Id: <20191027203356.188185690@linuxfoundation.org>
Date:   Sun, 27 Oct 2019 22:00:01 +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,
        Dmitry Bogdanov <dmitry.bogdanov@...antia.com>,
        Igor Russkikh <igor.russkikh@...antia.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.3 083/197] net: aquantia: do not pass lro session with invalid tcp checksum

From: Dmitry Bogdanov <dmitry.bogdanov@...antia.com>

[ Upstream commit d08b9a0a3ebdf71b0aabe576c7dd48e57e80e0f0 ]

Individual descriptors on LRO TCP session should be checked
for CRC errors. It was discovered that HW recalculates
L4 checksums on LRO session and does not break it up on bad L4
csum.

Thus, driver should aggregate HW LRO L4 statuses from all individual
buffers of LRO session and drop packet if one of the buffers has bad
L4 checksum.

Fixes: f38f1ee8aeb2 ("net: aquantia: check rx csum for all packets in LRO session")
Signed-off-by: Dmitry Bogdanov <dmitry.bogdanov@...antia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@...antia.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/aquantia/atlantic/aq_ring.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/aquantia/atlantic/aq_ring.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_ring.c
@@ -313,6 +313,7 @@ int aq_ring_rx_clean(struct aq_ring_s *s
 					break;
 
 				buff->is_error |= buff_->is_error;
+				buff->is_cso_err |= buff_->is_cso_err;
 
 			} while (!buff_->is_eop);
 
@@ -320,7 +321,7 @@ int aq_ring_rx_clean(struct aq_ring_s *s
 				err = 0;
 				goto err_exit;
 			}
-			if (buff->is_error) {
+			if (buff->is_error || buff->is_cso_err) {
 				buff_ = buff;
 				do {
 					next_ = buff_->next,