netdev - [PATCH net v4 2/2] net/mlx5e: Don't overwrite pedit action when multiple pedit used

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Date:   Sun, 27 Jan 2019 03:06:36 -0800
From:   xiangxia.m.yue@...il.com
To:     saeedm@...lanox.com, gerlitz.or@...il.com
Cc:     netdev@...r.kernel.org, Tonghao Zhang <xiangxia.m.yue@...il.com>,
        Or Gerlitz <ogerlitz@...lanox.com>
Subject: [PATCH net v4 2/2] net/mlx5e: Don't overwrite pedit action when multiple pedit used

From: Tonghao Zhang <xiangxia.m.yue@...il.com>

In some case, we may use multiple pedit actions to modify packets.
The command shown as below: the last pedit action is effective.

$ tc filter add dev netdev_rep parent ffff: protocol ip prio 1	\
	flower skip_sw ip_proto icmp dst_ip 3.3.3.3		\
	action pedit ex munge ip dst set 192.168.1.100 pipe	\
	action pedit ex munge eth src set 00:00:00:00:00:01 pipe	\
	action pedit ex munge eth dst set 00:00:00:00:00:02 pipe	\
	action csum ip pipe	\
	action tunnel_key set src_ip 1.1.1.100 dst_ip 1.1.1.200 dst_port 4789 id 100 \
	action mirred egress redirect dev vxlan0

To fix it, we add max_mod_hdr_actions to mlx5e_tc_flow_parse_attr struction,
max_mod_hdr_actions will store the max pedit action number we support and
num_mod_hdr_actions indicates how many pedit action we used, and store all
pedit action to mod_hdr_actions.

Fixes: d79b6df6b10a ("net/mlx5e: Add parsing of TC pedit actions to HW format")
Cc: Or Gerlitz <ogerlitz@...lanox.com>
Signed-off-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
---
v2: Fix comment message and change tag from net-next to net.
---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 26 +++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index cae6c6d..833a29a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -128,6 +128,7 @@ struct mlx5e_tc_flow_parse_attr {
 	struct net_device *filter_dev;
 	struct mlx5_flow_spec spec;
 	int num_mod_hdr_actions;
+	int max_mod_hdr_actions;
 	void *mod_hdr_actions;
 	int mirred_ifindex[MLX5_MAX_FLOW_FWD_VPORTS];
 };
@@ -1934,9 +1935,9 @@ struct mlx5_fields {
 	OFFLOAD(UDP_DPORT, 2, udp.dest,   0),
 };
 
-/* On input attr->num_mod_hdr_actions tells how many HW actions can be parsed at
- * max from the SW pedit action. On success, it says how many HW actions were
- * actually parsed.
+/* On input attr->max_mod_hdr_actions tells how many HW actions can be parsed at
+ * max from the SW pedit action. On success, attr->num_mod_hdr_actions
+ * says how many HW actions were actually parsed.
  */
 static int offload_pedit_fields(struct pedit_headers *masks,
 				struct pedit_headers *vals,
@@ -1960,9 +1961,11 @@ static int offload_pedit_fields(struct pedit_headers *masks,
 	add_vals = &vals[TCA_PEDIT_KEY_EX_CMD_ADD];
 
 	action_size = MLX5_UN_SZ_BYTES(set_action_in_add_action_in_auto);
-	action = parse_attr->mod_hdr_actions;
-	max_actions = parse_attr->num_mod_hdr_actions;
-	nactions = 0;
+	action = parse_attr->mod_hdr_actions +
+		 parse_attr->num_mod_hdr_actions * action_size;
+
+	max_actions = parse_attr->max_mod_hdr_actions;
+	nactions = parse_attr->num_mod_hdr_actions;
 
 	for (i = 0; i < ARRAY_SIZE(fields); i++) {
 		f = &fields[i];
@@ -2073,7 +2076,8 @@ static int alloc_mod_hdr_actions(struct mlx5e_priv *priv,
 	if (!parse_attr->mod_hdr_actions)
 		return -ENOMEM;
 
-	parse_attr->num_mod_hdr_actions = max_actions;
+	parse_attr->max_mod_hdr_actions = max_actions;
+	parse_attr->num_mod_hdr_actions = 0;
 	return 0;
 }
 
@@ -2119,9 +2123,11 @@ static int parse_tc_pedit_action(struct mlx5e_priv *priv,
 			goto out_err;
 	}
 
-	err = alloc_mod_hdr_actions(priv, a, namespace, parse_attr);
-	if (err)
-		goto out_err;
+	if (!parse_attr->mod_hdr_actions) {
+		err = alloc_mod_hdr_actions(priv, a, namespace, parse_attr);
+		if (err)
+			goto out_err;
+	}
 
 	err = offload_pedit_fields(masks, vals, parse_attr, extack);
 	if (err < 0)
-- 
1.8.3.1