[PATCH AUTOSEL 5.5 22/66] net: atlantic: checksum compat issue

[Sasha Levin]

From: Dmitry Bezrukov <dbezrukov@xxxxxxxxxxx>

[ Upstream commit 15beab0a9d797be1b7c67458da007a62269be29a ]

Yet another checksum offload compatibility issue was found.

The known issue is that AQC HW marks tcp packets with 0xFFFF checksum
as invalid (1). This is workarounded in driver, passing all the suspicious
packets up to the stack for further csum validation.

Another HW problem (2) is that it hides invalid csum of LRO aggregated
packets inside of the individual descriptors. That was workarounded
by forced scan of all LRO descriptors for checksum errors.

However the scan logic was joint for both LRO and multi-descriptor
packets (jumbos). And this causes the issue.

We have to drop LRO packets with the detected bad checksum
because of (2), but we have to pass jumbo packets to stack because of (1).

When using windows tcp partner with jumbo frames but with LSO disabled
driver discards such frames as bad checksummed. But only LRO frames
should be dropped, not jumbos.

On such a configurations tcp stream have a chance of drops and stucks.

(1) 76f254d4afe2 ("net: aquantia: tcp checksum 0xffff being handled incorrectly")
(2) d08b9a0a3ebd ("net: aquantia: do not pass lro session with invalid tcp checksum")

Fixes: d08b9a0a3ebd ("net: aquantia: do not pass lro session with invalid tcp checksum")
Signed-off-by: Dmitry Bezrukov <dbezrukov@xxxxxxxxxxx>
Signed-off-by: Igor Russkikh <irusskikh@xxxxxxxxxxx>
Signed-off-by: Dmitry Bogdanov <dbogdanov@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/ethernet/aquantia/atlantic/aq_ring.c          | 3 ++-
 drivers/net/ethernet/aquantia/atlantic/aq_ring.h          | 3 ++-
 drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c | 5 +++--
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_ring.c b/drivers/net/ethernet/aquantia/atlantic/aq_ring.c
index 951d86f8b66e8..6941999ae845d 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_ring.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_ring.c
@@ -351,7 +351,8 @@ int aq_ring_rx_clean(struct aq_ring_s *self,
 				err = 0;
 				goto err_exit;
 			}
-			if (buff->is_error || buff->is_cso_err) {
+			if (buff->is_error ||
+			    (buff->is_lro && buff->is_cso_err)) {
 				buff_ = buff;
 				do {
 					next_ = buff_->next,
diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_ring.h b/drivers/net/ethernet/aquantia/atlantic/aq_ring.h
index 991e4d31b0948..2c96f20f62891 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_ring.h
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_ring.h
@@ -78,7 +78,8 @@ struct __packed aq_ring_buff_s {
 			u32 is_cleaned:1;
 			u32 is_error:1;
 			u32 is_vlan:1;
-			u32 rsvd3:4;
+			u32 is_lro:1;
+			u32 rsvd3:3;
 			u16 eop_index;
 			u16 rsvd4;
 		};
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 ec041f78d0634..5784da26f8683 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
@@ -823,6 +823,8 @@ static int hw_atl_b0_hw_ring_rx_receive(struct aq_hw_s *self,
 			}
 		}
 
+		buff->is_lro = !!(HW_ATL_B0_RXD_WB_STAT2_RSCCNT &
+				  rxd_wb->status);
 		if (HW_ATL_B0_RXD_WB_STAT2_EOP & rxd_wb->status) {
 			buff->len = rxd_wb->pkt_len %
 				AQ_CFG_RX_FRAME_MAX;
@@ -835,8 +837,7 @@ static int hw_atl_b0_hw_ring_rx_receive(struct aq_hw_s *self,
 				rxd_wb->pkt_len > AQ_CFG_RX_FRAME_MAX ?
 				AQ_CFG_RX_FRAME_MAX : rxd_wb->pkt_len;
 
-			if (HW_ATL_B0_RXD_WB_STAT2_RSCCNT &
-				rxd_wb->status) {
+			if (buff->is_lro) {
 				/* LRO */
 				buff->next = rxd_wb->next_desc_ptr;
 				++ring->stats.rx.lro_packets;
-- 
2.20.1