[SRU][Bionic][PATCH 2/5] net/mlx5e: Properly order min inline mode setup while parsing TC matches

[Juerg Haefliger]

From: Or Gerlitz <ogerlitz at mellanox.com>

BugLink: https://bugs.launchpad.net/bugs/1842502

Set the initial value to none instead of L2, and set to L2
where the previous initial value was assumed. Make sure to
parse L2 matches before L3 matches and L3 before L4.

This is a pre-step to get the match level for more purposes
other than the validating the needed vs. actual inline level.

Signed-off-by: Or Gerlitz <ogerlitz at mellanox.com>
Reviewed-by: Roi Dayan <roid at mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm at mellanox.com>
(cherry picked from commit 547829004c98941f73d010c87c2111e29a6c03ae)
Signed-off-by: Juerg Haefliger <juergh at canonical.com>
---
 .../net/ethernet/mellanox/mlx5/core/en_tc.c   | 129 +++++++++++-------
 1 file changed, 76 insertions(+), 53 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 52e6e943e75a..9a869a008d47 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -730,7 +730,7 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 	u16 addr_type = 0;
 	u8 ip_proto = 0;
 
-	*min_inline = MLX5_INLINE_MODE_L2;
+	*min_inline = MLX5_INLINE_MODE_NONE;
 
 	if (f->dissector->used_keys &
 	    ~(BIT(FLOW_DISSECTOR_KEY_CONTROL) |
@@ -780,58 +780,6 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 					 inner_headers);
 	}
 
-	if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_CONTROL)) {
-		struct flow_dissector_key_control *key =
-			skb_flow_dissector_target(f->dissector,
-						  FLOW_DISSECTOR_KEY_CONTROL,
-						  f->key);
-
-		struct flow_dissector_key_control *mask =
-			skb_flow_dissector_target(f->dissector,
-						  FLOW_DISSECTOR_KEY_CONTROL,
-						  f->mask);
-		addr_type = key->addr_type;
-
-		/* the HW doesn't support frag first/later */
-		if (mask->flags & FLOW_DIS_FIRST_FRAG)
-			return -EOPNOTSUPP;
-
-		if (mask->flags & FLOW_DIS_IS_FRAGMENT) {
-			MLX5_SET(fte_match_set_lyr_2_4, headers_c, frag, 1);
-			MLX5_SET(fte_match_set_lyr_2_4, headers_v, frag,
-				 key->flags & FLOW_DIS_IS_FRAGMENT);
-
-			/* the HW doesn't need L3 inline to match on frag=no */
-			if (key->flags & FLOW_DIS_IS_FRAGMENT)
-				*min_inline = MLX5_INLINE_MODE_IP;
-		}
-	}
-
-	if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_BASIC)) {
-		struct flow_dissector_key_basic *key =
-			skb_flow_dissector_target(f->dissector,
-						  FLOW_DISSECTOR_KEY_BASIC,
-						  f->key);
-		struct flow_dissector_key_basic *mask =
-			skb_flow_dissector_target(f->dissector,
-						  FLOW_DISSECTOR_KEY_BASIC,
-						  f->mask);
-		ip_proto = key->ip_proto;
-
-		MLX5_SET(fte_match_set_lyr_2_4, headers_c, ethertype,
-			 ntohs(mask->n_proto));
-		MLX5_SET(fte_match_set_lyr_2_4, headers_v, ethertype,
-			 ntohs(key->n_proto));
-
-		MLX5_SET(fte_match_set_lyr_2_4, headers_c, ip_protocol,
-			 mask->ip_proto);
-		MLX5_SET(fte_match_set_lyr_2_4, headers_v, ip_protocol,
-			 key->ip_proto);
-
-		if (mask->ip_proto)
-			*min_inline = MLX5_INLINE_MODE_IP;
-	}
-
 	if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
 		struct flow_dissector_key_eth_addrs *key =
 			skb_flow_dissector_target(f->dissector,
@@ -855,6 +803,9 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 		ether_addr_copy(MLX5_ADDR_OF(fte_match_set_lyr_2_4, headers_v,
 					     smac_47_16),
 				key->src);
+
+		if (!is_zero_ether_addr(mask->src) || !is_zero_ether_addr(mask->dst))
+			*min_inline = MLX5_INLINE_MODE_L2;
 	}
 
 	if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_VLAN)) {
@@ -875,12 +826,82 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 
 			MLX5_SET(fte_match_set_lyr_2_4, headers_c, first_prio, mask->vlan_priority);
 			MLX5_SET(fte_match_set_lyr_2_4, headers_v, first_prio, key->vlan_priority);
+
+			*min_inline = MLX5_INLINE_MODE_L2;
 		}
 	} else {
 		MLX5_SET(fte_match_set_lyr_2_4, headers_c, svlan_tag, 1);
 		MLX5_SET(fte_match_set_lyr_2_4, headers_c, cvlan_tag, 1);
 	}
 
+	if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_BASIC)) {
+		struct flow_dissector_key_basic *key =
+			skb_flow_dissector_target(f->dissector,
+						  FLOW_DISSECTOR_KEY_BASIC,
+						  f->key);
+		struct flow_dissector_key_basic *mask =
+			skb_flow_dissector_target(f->dissector,
+						  FLOW_DISSECTOR_KEY_BASIC,
+						  f->mask);
+		MLX5_SET(fte_match_set_lyr_2_4, headers_c, ethertype,
+			 ntohs(mask->n_proto));
+		MLX5_SET(fte_match_set_lyr_2_4, headers_v, ethertype,
+			 ntohs(key->n_proto));
+
+		if (mask->n_proto)
+			*min_inline = MLX5_INLINE_MODE_L2;
+	}
+
+	if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_CONTROL)) {
+		struct flow_dissector_key_control *key =
+			skb_flow_dissector_target(f->dissector,
+						  FLOW_DISSECTOR_KEY_CONTROL,
+						  f->key);
+
+		struct flow_dissector_key_control *mask =
+			skb_flow_dissector_target(f->dissector,
+						  FLOW_DISSECTOR_KEY_CONTROL,
+						  f->mask);
+		addr_type = key->addr_type;
+
+		/* the HW doesn't support frag first/later */
+		if (mask->flags & FLOW_DIS_FIRST_FRAG)
+			return -EOPNOTSUPP;
+
+		if (mask->flags & FLOW_DIS_IS_FRAGMENT) {
+			MLX5_SET(fte_match_set_lyr_2_4, headers_c, frag, 1);
+			MLX5_SET(fte_match_set_lyr_2_4, headers_v, frag,
+				 key->flags & FLOW_DIS_IS_FRAGMENT);
+
+			/* the HW doesn't need L3 inline to match on frag=no */
+			if (!(key->flags & FLOW_DIS_IS_FRAGMENT))
+				*min_inline = MLX5_INLINE_MODE_L2;
+	/* ***  L2 attributes parsing up to here *** */
+			else
+				*min_inline = MLX5_INLINE_MODE_IP;
+		}
+	}
+
+	if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_BASIC)) {
+		struct flow_dissector_key_basic *key =
+			skb_flow_dissector_target(f->dissector,
+						  FLOW_DISSECTOR_KEY_BASIC,
+						  f->key);
+		struct flow_dissector_key_basic *mask =
+			skb_flow_dissector_target(f->dissector,
+						  FLOW_DISSECTOR_KEY_BASIC,
+						  f->mask);
+		ip_proto = key->ip_proto;
+
+		MLX5_SET(fte_match_set_lyr_2_4, headers_c, ip_protocol,
+			 mask->ip_proto);
+		MLX5_SET(fte_match_set_lyr_2_4, headers_v, ip_protocol,
+			 key->ip_proto);
+
+		if (mask->ip_proto)
+			*min_inline = MLX5_INLINE_MODE_IP;
+	}
+
 	if (addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
 		struct flow_dissector_key_ipv4_addrs *key =
 			skb_flow_dissector_target(f->dissector,
@@ -965,6 +986,8 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 			*min_inline = MLX5_INLINE_MODE_IP;
 	}
 
+	/* ***  L3 attributes parsing up to here *** */
+
 	if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_PORTS)) {
 		struct flow_dissector_key_ports *key =
 			skb_flow_dissector_target(f->dissector,
-- 
2.20.1