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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Maor Gottlieb <maorg@mellanox.com>,
	Leon Romanovsky <leonro@mellanox.com>,
	Jason Gunthorpe <jgg@mellanox.com>,
	Sasha Levin <sashal@kernel.org>,
	linux-rdma@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 126/671] IB/mlx5: Don't override existing ip_protocol
Date: Thu, 16 Jan 2020 11:50:35 -0500
Message-ID: <20200116165940.10720-9-sashal@kernel.org> (raw)
In-Reply-To: <20200116165940.10720-1-sashal@kernel.org>

From: Maor Gottlieb <maorg@mellanox.com>

[ Upstream commit 6113cc44015b41ca51c0a76fed82522b68108dac ]

Two flow specifications can set the ip protocol field in
the flow table entry:

1) IB_FLOW_SPEC_TCP/UDP/GRE - set the ip protocol accordingly.
2) IB_FLOW_SPEC_IPV4/6 - has ip_protocol field for users
who want to receive specific L4 packets.

We need to avoid overriding of the ip_protocol with zeros,
in case that the user first put the L4 specification and
only then the L3.

Fixes: ca0d47538528b ('IB/mlx5: Add support in TOS and protocol to flow steering')
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/infiniband/hw/mlx5/main.c | 53 +++++++++++++++++++++----------
 1 file changed, 37 insertions(+), 16 deletions(-)

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index df5be462dd28..2db34f7b5ced 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -2390,10 +2390,29 @@ static u8 get_match_criteria_enable(u32 *match_criteria)
 	return match_criteria_enable;
 }
 
-static void set_proto(void *outer_c, void *outer_v, u8 mask, u8 val)
+static int set_proto(void *outer_c, void *outer_v, u8 mask, u8 val)
 {
-	MLX5_SET(fte_match_set_lyr_2_4, outer_c, ip_protocol, mask);
-	MLX5_SET(fte_match_set_lyr_2_4, outer_v, ip_protocol, val);
+	u8 entry_mask;
+	u8 entry_val;
+	int err = 0;
+
+	if (!mask)
+		goto out;
+
+	entry_mask = MLX5_GET(fte_match_set_lyr_2_4, outer_c,
+			      ip_protocol);
+	entry_val = MLX5_GET(fte_match_set_lyr_2_4, outer_v,
+			     ip_protocol);
+	if (!entry_mask) {
+		MLX5_SET(fte_match_set_lyr_2_4, outer_c, ip_protocol, mask);
+		MLX5_SET(fte_match_set_lyr_2_4, outer_v, ip_protocol, val);
+		goto out;
+	}
+	/* Don't override existing ip protocol */
+	if (mask != entry_mask || val != entry_val)
+		err = -EINVAL;
+out:
+	return err;
 }
 
 static void set_flow_label(void *misc_c, void *misc_v, u32 mask, u32 val,
@@ -2597,8 +2616,10 @@ static int parse_flow_attr(struct mlx5_core_dev *mdev, u32 *match_c,
 		set_tos(headers_c, headers_v,
 			ib_spec->ipv4.mask.tos, ib_spec->ipv4.val.tos);
 
-		set_proto(headers_c, headers_v,
-			  ib_spec->ipv4.mask.proto, ib_spec->ipv4.val.proto);
+		if (set_proto(headers_c, headers_v,
+			      ib_spec->ipv4.mask.proto,
+			      ib_spec->ipv4.val.proto))
+			return -EINVAL;
 		break;
 	case IB_FLOW_SPEC_IPV6:
 		if (FIELDS_NOT_SUPPORTED(ib_spec->ipv6.mask, LAST_IPV6_FIELD))
@@ -2637,9 +2658,10 @@ static int parse_flow_attr(struct mlx5_core_dev *mdev, u32 *match_c,
 			ib_spec->ipv6.mask.traffic_class,
 			ib_spec->ipv6.val.traffic_class);
 
-		set_proto(headers_c, headers_v,
-			  ib_spec->ipv6.mask.next_hdr,
-			  ib_spec->ipv6.val.next_hdr);
+		if (set_proto(headers_c, headers_v,
+			      ib_spec->ipv6.mask.next_hdr,
+			      ib_spec->ipv6.val.next_hdr))
+			return -EINVAL;
 
 		set_flow_label(misc_params_c, misc_params_v,
 			       ntohl(ib_spec->ipv6.mask.flow_label),
@@ -2660,10 +2682,8 @@ static int parse_flow_attr(struct mlx5_core_dev *mdev, u32 *match_c,
 					 LAST_TCP_UDP_FIELD))
 			return -EOPNOTSUPP;
 
-		MLX5_SET(fte_match_set_lyr_2_4, headers_c, ip_protocol,
-			 0xff);
-		MLX5_SET(fte_match_set_lyr_2_4, headers_v, ip_protocol,
-			 IPPROTO_TCP);
+		if (set_proto(headers_c, headers_v, 0xff, IPPROTO_TCP))
+			return -EINVAL;
 
 		MLX5_SET(fte_match_set_lyr_2_4, headers_c, tcp_sport,
 			 ntohs(ib_spec->tcp_udp.mask.src_port));
@@ -2680,10 +2700,8 @@ static int parse_flow_attr(struct mlx5_core_dev *mdev, u32 *match_c,
 					 LAST_TCP_UDP_FIELD))
 			return -EOPNOTSUPP;
 
-		MLX5_SET(fte_match_set_lyr_2_4, headers_c, ip_protocol,
-			 0xff);
-		MLX5_SET(fte_match_set_lyr_2_4, headers_v, ip_protocol,
-			 IPPROTO_UDP);
+		if (set_proto(headers_c, headers_v, 0xff, IPPROTO_UDP))
+			return -EINVAL;
 
 		MLX5_SET(fte_match_set_lyr_2_4, headers_c, udp_sport,
 			 ntohs(ib_spec->tcp_udp.mask.src_port));
@@ -2699,6 +2717,9 @@ static int parse_flow_attr(struct mlx5_core_dev *mdev, u32 *match_c,
 		if (ib_spec->gre.mask.c_ks_res0_ver)
 			return -EOPNOTSUPP;
 
+		if (set_proto(headers_c, headers_v, 0xff, IPPROTO_GRE))
+			return -EINVAL;
+
 		MLX5_SET(fte_match_set_lyr_2_4, headers_c, ip_protocol,
 			 0xff);
 		MLX5_SET(fte_match_set_lyr_2_4, headers_v, ip_protocol,
-- 
2.20.1


  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200116165940.10720-1-sashal@kernel.org>
2020-01-16 16:50 ` [PATCH AUTOSEL 4.19 123/671] IB/iser: Pass the correct number of entries for dma mapped SGL Sasha Levin
2020-01-16 16:50 ` Sasha Levin [this message]
2020-01-16 16:50 ` [PATCH AUTOSEL 4.19 133/671] net/mlx5: Take lock with IRQs disabled to avoid deadlock Sasha Levin
2020-01-16 16:51 ` [PATCH AUTOSEL 4.19 167/671] iw_cxgb4: use tos when importing the endpoint Sasha Levin
2020-01-16 16:51 ` [PATCH AUTOSEL 4.19 168/671] iw_cxgb4: use tos when finding ipv6 routes Sasha Levin
2020-01-16 16:51 ` [PATCH AUTOSEL 4.19 178/671] RDMA/mlx5: Fix memory leak in case we fail to add an IB device Sasha Levin
2020-01-16 16:51 ` [PATCH AUTOSEL 4.19 201/671] net/mlx5: Delete unused FPGA QPN variable Sasha Levin
2020-01-16 16:52 ` [PATCH AUTOSEL 4.19 243/671] net/mlx5: Fix multiple updates of steering rules in parallel Sasha Levin
2020-01-16 16:52 ` [PATCH AUTOSEL 4.19 244/671] net/mlx5e: IPoIB, Fix RX checksum statistics update Sasha Levin

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