[dpdk-dev] [PATCH] net/mlx5: fix mask used for IPv6 item validation

[Dekel Peled <dekelp@mellanox.com>]

The nic_mask struct in function mlx5_flow_validate_item_ipv6()
includes hop_limits field.
This is redundant since matching on this item is not supported using
Verbs flow engine (dv_flow_en=0).

(Separate patch will be sent to handle this issue for DV flow engine.)

Setting a rule including match on this field will fail:
testpmd> flow create 0 ingress pattern eth / ipv6 hop is 1 / end actions
drop / end
port_flow_complain(): Caught PMD error type 1 (cause unspecified):
hardware refuses to create flow: Operation not supported

This patch removes the redundant field from nic_mask, to ensure that
such flow rules will be rejected by PMD validation:
testpmd> flow create 0 ingress pattern eth / ipv6 hop is 1 / end actions
drop / end
port_flow_complain(): Caught PMD error type 13 (specific pattern item):
cause: 0x7fffffffa2c8, mask enables non supported bits: Operation not
supported

The related lines in function flow_verbs_translate_item_ipv6() are
removed as well, since they are redundant.

Fixes: 23c1d42c7138 ("net/mlx5: split flow validation to dedicated function")
Fixes: 84c406e74524 ("net/mlx5: add flow translate function")
Cc: stable@dpdk.org

Signed-off-by: Dekel Peled <dekelp@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>
---
 drivers/net/mlx5/mlx5_flow.c       | 1 -
 drivers/net/mlx5/mlx5_flow_verbs.c | 3 ---
 2 files changed, 4 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 16c1ef3..41072da 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -1640,7 +1640,6 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 				"\xff\xff\xff\xff\xff\xff\xff\xff",
 			.vtc_flow = RTE_BE32(0xffffffff),
 			.proto = 0xff,
-			.hop_limits = 0xff,
 		},
 	};
 	const int tunnel = !!(item_flags & MLX5_FLOW_LAYER_TUNNEL);
diff --git a/drivers/net/mlx5/mlx5_flow_verbs.c b/drivers/net/mlx5/mlx5_flow_verbs.c
index 04845f8..459e7b6 100644
--- a/drivers/net/mlx5/mlx5_flow_verbs.c
+++ b/drivers/net/mlx5/mlx5_flow_verbs.c
@@ -494,14 +494,12 @@
 		ipv6.val.traffic_class = (vtc_flow_val & RTE_IPV6_HDR_TC_MASK) >>
 					 RTE_IPV6_HDR_TC_SHIFT;
 		ipv6.val.next_hdr = spec->hdr.proto;
-		ipv6.val.hop_limit = spec->hdr.hop_limits;
 		ipv6.mask.flow_label =
 			rte_cpu_to_be_32((vtc_flow_mask & RTE_IPV6_HDR_FL_MASK) >>
 					 RTE_IPV6_HDR_FL_SHIFT);
 		ipv6.mask.traffic_class = (vtc_flow_mask & RTE_IPV6_HDR_TC_MASK) >>
 					  RTE_IPV6_HDR_TC_SHIFT;
 		ipv6.mask.next_hdr = mask->hdr.proto;
-		ipv6.mask.hop_limit = mask->hdr.hop_limits;
 		/* Remove unwanted bits from values. */
 		for (i = 0; i < RTE_DIM(ipv6.val.src_ip); ++i) {
 			ipv6.val.src_ip[i] &= ipv6.mask.src_ip[i];
@@ -510,7 +508,6 @@
 		ipv6.val.flow_label &= ipv6.mask.flow_label;
 		ipv6.val.traffic_class &= ipv6.mask.traffic_class;
 		ipv6.val.next_hdr &= ipv6.mask.next_hdr;
-		ipv6.val.hop_limit &= ipv6.mask.hop_limit;
 	}
 	flow_verbs_spec_add(&dev_flow->verbs, &ipv6, size);
 }
-- 
1.8.3.1