Re: [dpdk-dev] [PATCH v5 5/7] net/mlx5: support modify VLAN priority on VLAN hdr

[Slava Ovsiienko <viacheslavo@mellanox.com>]

> -----Original Message-----
> From: Moti Haimovsky <motih@mellanox.com>
> Sent: Monday, September 9, 2019 18:57
> To: Slava Ovsiienko <viacheslavo@mellanox.com>; Raslan Darawsheh
> <rasland@mellanox.com>
> Cc: dev@dpdk.org
> Subject: [PATCH v5 5/7] net/mlx5: support modify VLAN priority on VLAN hdr
> 
> This commit adds support for modifying the VLAN priority (PCP) field in
> about-to-be-pushed VLAN header.
> This feature can only modify the PCP field of a new VLAN header yet to be
> pushed. It does not support modifying an existing or already pushed VLAN
> headers.
> 
> Signed-off-by: Moti Haimovsky <motih@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>

> ---
> v4:
> - Fixed typo in an error message.
> ---
>  doc/guides/nics/mlx5.rst               |  5 ++-
>  doc/guides/rel_notes/release_19_11.rst |  1 +
>  drivers/net/mlx5/mlx5_flow_dv.c        | 62
> ++++++++++++++++++++++++++++++++++
>  3 files changed, 67 insertions(+), 1 deletion(-)
> 
> diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst index
> 875a87f..01215f4 100644
> --- a/doc/guides/nics/mlx5.rst
> +++ b/doc/guides/nics/mlx5.rst
> @@ -132,6 +132,8 @@ Limitations
> 
>  - VLAN push offload is not supported on ingress traffic.
> 
> +- VLAN set PCP offload is not supported on existing headers.
> +
>  - A multi segment packet must have not more segments than reported by
> dev_infos_get()
>    in tx_desc_lim.nb_seg_max field. This value depends on maximal supported
> Tx descriptor
>    size and ``txq_inline_min`` settings and may be from 2 (worst case forced
> by maximal @@ -1042,7 +1044,8 @@ Supported hardware offloads
>     +-----------------------+-----------------+-----------------+
>     | | VLAN                | | DPDK 19.11    | | DPDK 19.11    |
>     | | (of_pop_vlan /      | | OFED 4.6-4    | | OFED 4.6-4    |
> -   | | of_push_vlan)       | | ConnectX-5    | | ConnectX-5    |
> +   | | of_push_vlan /      | | ConnectX-5    | | ConnectX-5    |
> +   | | of_set_vlan_pcp)    |                 |                 |
>     +-----------------------+-----------------+-----------------+
> 
>  Notes for testpmd
> diff --git a/doc/guides/rel_notes/release_19_11.rst
> b/doc/guides/rel_notes/release_19_11.rst
> index afe92ab..5067a1c 100644
> --- a/doc/guides/rel_notes/release_19_11.rst
> +++ b/doc/guides/rel_notes/release_19_11.rst
> @@ -229,4 +229,5 @@ Tested Platforms
> 
>    * Added support for VLAN pop flow offload command.
>    * Added support for VLAN push flow offload command.
> +  * Added support for VLAN set PCP offload command.
> 
> diff --git a/drivers/net/mlx5/mlx5_flow_dv.c
> b/drivers/net/mlx5/mlx5_flow_dv.c index 2780735..73459a0 100644
> --- a/drivers/net/mlx5/mlx5_flow_dv.c
> +++ b/drivers/net/mlx5/mlx5_flow_dv.c
> @@ -974,6 +974,47 @@ struct field_modify_info modify_tcp[] = {  }
> 
>  /**
> + * Validate the set VLAN PCP.
> + *
> + * @param[in] action_flags
> + *   Holds the actions detected until now.
> + * @param[in] actions
> + *   Pointer to the list of actions remaining in the flow rule.
> + * @param[in] attr
> + *   Pointer to flow attributes
> + * @param[out] error
> + *   Pointer to error structure.
> + *
> + * @return
> + *   0 on success, a negative errno value otherwise and rte_errno is set.
> + */
> +static int
> +flow_dv_validate_action_set_vlan_pcp(uint64_t action_flags,
> +				     const struct rte_flow_action actions[],
> +				     struct rte_flow_error *error)
> +{
> +	const struct rte_flow_action *action = actions;
> +	const struct rte_flow_action_of_set_vlan_pcp *conf = action->conf;
> +
> +	if (conf->vlan_pcp > 7)
> +		return rte_flow_error_set(error, EINVAL,
> +					  RTE_FLOW_ERROR_TYPE_ACTION,
> action,
> +					  "VLAN PCP value is too big");
> +	if (mlx5_flow_find_action(actions,
> +
> RTE_FLOW_ACTION_TYPE_OF_PUSH_VLAN) == NULL)
> +		return rte_flow_error_set(error, ENOTSUP,
> +					  RTE_FLOW_ERROR_TYPE_ACTION,
> action,
> +					  "set VLAN PCP can only be used "
> +					  "with push VLAN action");
> +	if (action_flags & MLX5_FLOW_ACTION_OF_PUSH_VLAN)
> +		return rte_flow_error_set(error, ENOTSUP,
> +					  RTE_FLOW_ERROR_TYPE_ACTION,
> action,
> +					  "set VLAN PCP action must precede
> "
> +					  "the push VLAN action");
> +	return 0;
> +}
> +
> +/**
>   * Validate count action.
>   *
>   * @param[in] dev
> @@ -3396,6 +3437,13 @@ struct field_modify_info modify_tcp[] = {
>  			action_flags |=
> MLX5_FLOW_ACTION_OF_PUSH_VLAN;
>  			++actions_n;
>  			break;
> +		case RTE_FLOW_ACTION_TYPE_OF_SET_VLAN_PCP:
> +			ret = flow_dv_validate_action_set_vlan_pcp
> +						(action_flags, actions, error);
> +			if (ret < 0)
> +				return ret;
> +			/* Count PCP with push_vlan command. */
> +			break;
>  		case RTE_FLOW_ACTION_TYPE_VXLAN_ENCAP:
>  		case RTE_FLOW_ACTION_TYPE_NVGRE_ENCAP:
>  			ret =
> flow_dv_validate_action_l2_encap(action_flags,
> @@ -4989,6 +5037,7 @@ struct field_modify_info modify_tcp[] = {
>  	uint8_t next_protocol = 0xff;
>  	struct rte_vlan_hdr vlan = { 0 };
>  	bool vlan_inherited = false;
> +	uint16_t vlan_tci;
> 
>  	flow->group = attr->group;
>  	if (attr->transfer)
> @@ -5118,6 +5167,19 @@ struct field_modify_info modify_tcp[] = {
>  					   dev_flow->dv.push_vlan_res-
> >action;
>  			action_flags |=
> MLX5_FLOW_ACTION_OF_PUSH_VLAN;
>  			break;
> +		case RTE_FLOW_ACTION_TYPE_OF_SET_VLAN_PCP:
> +			if (!vlan_inherited) {
> +				flow_dev_get_vlan_info_from_items(items,
> &vlan);
> +				vlan_inherited = true;
> +			}
> +			vlan_tci =
> +			    ((const struct rte_flow_action_of_set_vlan_pcp *)
> +						       actions->conf)-
> >vlan_pcp;
> +			vlan_tci = vlan_tci <<
> MLX5DV_FLOW_VLAN_PCP_SHIFT;
> +			vlan.vlan_tci &= ~MLX5DV_FLOW_VLAN_PCP_MASK;
> +			vlan.vlan_tci |= vlan_tci;
> +			/* Push VLAN command will use this value */
> +			break;
>  		case RTE_FLOW_ACTION_TYPE_VXLAN_ENCAP:
>  		case RTE_FLOW_ACTION_TYPE_NVGRE_ENCAP:
>  			if (flow_dv_create_action_l2_encap(dev, actions,
> --
> 1.8.3.1