net/mlx5: fix meter header modify before decap issue

  The meter flows are split into three subflows each, the prefix subflow
with meter action color the packet, the meter subflow filters out the
colored packets, the suffix subflow applies all the remaining actions
to the passed packets. The tag header modify action is added to the
prefix subflow to make the suffix subflow to match the packets from the
prefix subflow.

Currently, the tag header modify action is added at the beginning in the
prefix subflow even before decap action. The header modify action does
not make sense to the later decap action, so the flow create will be
validated as incorrect flow rule and failed.

Move the tag header modify action just before meter action in the prefix
subflow to make the flow with decap action to do the decap first, then
do the tag and meter to fix that issue.

Fixes: 9ea9b049a960 ("net/mlx5: split meter flow")
Cc: stable@dpdk.org

Reported-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Signed-off-by: Suanming Mou <suanmingm@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
---
 drivers/net/mlx5/mlx5_flow.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)
  

From: Suanming Mou
> The meter flows are split into three subflows each, the prefix subflow with
> meter action color the packet, the meter subflow filters out the colored
> packets, the suffix subflow applies all the remaining actions to the passed
> packets. The tag header modify action is added to the prefix subflow to make
> the suffix subflow to match the packets from the prefix subflow.
> 
> Currently, the tag header modify action is added at the beginning in the
> prefix subflow even before decap action. The header modify action does not
> make sense to the later decap action, so the flow create will be validated as
> incorrect flow rule and failed.
> 
> Move the tag header modify action just before meter action in the prefix
> subflow to make the flow with decap action to do the decap first, then do
> the tag and meter to fix that issue.
> 
> Fixes: 9ea9b049a960 ("net/mlx5: split meter flow")
> Cc: stable@dpdk.org
> 
> Reported-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
> Signed-off-by: Suanming Mou <suanmingm@mellanox.com>
> Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>
  

Hi,
> -----Original Message-----
> From: Suanming Mou <suanmingm@mellanox.com>
> Sent: Thursday, February 6, 2020 6:14 AM
> To: Matan Azrad <matan@mellanox.com>; Shahaf Shuler
> <shahafs@mellanox.com>; Slava Ovsiienko <viacheslavo@mellanox.com>
> Cc: dev@dpdk.org; xiangxia.m.yue@gmail.com; Raslan Darawsheh
> <rasland@mellanox.com>; stable@dpdk.org
> Subject: [PATCH] net/mlx5: fix meter header modify before decap issue
> 
> The meter flows are split into three subflows each, the prefix subflow
> with meter action color the packet, the meter subflow filters out the
> colored packets, the suffix subflow applies all the remaining actions
> to the passed packets. The tag header modify action is added to the
> prefix subflow to make the suffix subflow to match the packets from the
> prefix subflow.
> 
> Currently, the tag header modify action is added at the beginning in the
> prefix subflow even before decap action. The header modify action does
> not make sense to the later decap action, so the flow create will be
> validated as incorrect flow rule and failed.
> 
> Move the tag header modify action just before meter action in the prefix
> subflow to make the flow with decap action to do the decap first, then
> do the tag and meter to fix that issue.
> 
> Fixes: 9ea9b049a960 ("net/mlx5: split meter flow")
> Cc: stable@dpdk.org
> 
> Reported-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
> Signed-off-by: Suanming Mou <suanmingm@mellanox.com>
> Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
> ---
>  drivers/net/mlx5/mlx5_flow.c | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
> index 144e07c..7f1830f 100644
> --- a/drivers/net/mlx5/mlx5_flow.c
> +++ b/drivers/net/mlx5/mlx5_flow.c
> @@ -3476,21 +3476,25 @@ uint32_t mlx5_flow_adjust_priority(struct
> rte_eth_dev *dev, int32_t priority,
>  		 struct rte_flow_action actions_sfx[],
>  		 struct rte_flow_action actions_pre[])
>  {
> -	struct rte_flow_action *tag_action;
> +	struct rte_flow_action *tag_action = NULL;
>  	struct mlx5_rte_flow_action_set_tag *set_tag;
>  	struct rte_flow_error error;
>  	const struct rte_flow_action_raw_encap *raw_encap;
>  	const struct rte_flow_action_raw_decap *raw_decap;
>  	uint32_t tag_id;
> 
> -	/* Add the extra tag action first. */
> -	tag_action = actions_pre;
> -	tag_action->type = MLX5_RTE_FLOW_ACTION_TYPE_TAG;
> -	actions_pre++;
>  	/* Prepare the actions for prefix and suffix flow. */
>  	for (; actions->type != RTE_FLOW_ACTION_TYPE_END; actions++) {
>  		switch (actions->type) {
>  		case RTE_FLOW_ACTION_TYPE_METER:
> +			/* Add the extra tag action first. */
> +			tag_action = actions_pre;
> +			tag_action->type =
> MLX5_RTE_FLOW_ACTION_TYPE_TAG;
> +			actions_pre++;
> +			memcpy(actions_pre, actions,
> +			       sizeof(struct rte_flow_action));
> +			actions_pre++;
> +			break;
>  		case RTE_FLOW_ACTION_TYPE_VXLAN_DECAP:
>  		case RTE_FLOW_ACTION_TYPE_NVGRE_DECAP:
>  			memcpy(actions_pre, actions,
> @@ -3545,6 +3549,7 @@ uint32_t mlx5_flow_adjust_priority(struct
> rte_eth_dev *dev, int32_t priority,
>  	 */
>  	tag_id = flow_qrss_get_id(dev);
>  	set_tag->data = tag_id << MLX5_MTR_COLOR_BITS;
> +	assert(tag_action);
>  	tag_action->conf = set_tag;
>  	return tag_id;
>  }
> --
> 1.8.3.1

Patch applied to next-net-mlx,

Kindest regards,
Raslan Darawsheh