Re: [dpdk-dev] [PATCH v9 1/3] ethdev: add actions to modify TCP header fields

[Andrew Rybchenko <arybchenko@solarflare.com>]

On 01.07.2019 18:43, Dekel Peled wrote:
> Add actions:
> - INC_TCP_SEQ - Increase sequence number in the outermost TCP header.
> - DEC_TCP_SEQ - Decrease sequence number in the outermost TCP header.
> - INC_TCP_ACK - Increase acknowledgment number in the outermost TCP
> 		header.
> - DEC_TCP_ACK - Decrease acknowledgment number in the outermost TCP
> 		header.
>
> Original work by Xiaoyu Min.
>
> This patch uses the new approach introduced by [1], using a simple
> integer instead of using an action-specific structure for each of
> the new actions.
>
> [1] http://patches.dpdk.org/patch/55773/
>
> Signed-off-by: Dekel Peled <dekelp@mellanox.com>
> Acked-by: Andrew Rybchenko <arybchenko@solarflare.com>
> ---
>   doc/guides/prog_guide/rte_flow.rst | 32 ++++++++++++++++++++++++++++++++
>   lib/librte_ethdev/rte_flow.c       |  4 ++++
>   lib/librte_ethdev/rte_flow.h       | 32 ++++++++++++++++++++++++++++++++
>   3 files changed, 68 insertions(+)
>
> diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst
> index 67deed7..bbe32db 100644
> --- a/doc/guides/prog_guide/rte_flow.rst
> +++ b/doc/guides/prog_guide/rte_flow.rst
> @@ -2346,6 +2346,38 @@ Otherwise, RTE_FLOW_ERROR_TYPE_ACTION error will be returned.
>      | ``mac_addr`` | MAC address   |
>      +--------------+---------------+
>   
> +Action: ``INC_TCP_SEQ``
> +^^^^^^^^^^^^^^^^^^^^^^^
> +
> +Increase sequence number in the outermost TCP header.
> +Value to increase TCP sequence number by is a big-endian 32 bit integer.
> +
> +Using this action on non-matching traffic will result in undefined behavior.
> +
> +Action: ``DEC_TCP_SEQ``
> +^^^^^^^^^^^^^^^^^^^^^^^
> +
> +Decrease sequence number in the outermost TCP header.
> +Value to decrease TCP sequence number by is a big-endian 32 bit integer.
> +
> +Using this action on non-matching traffic will result in undefined behavior.
> +
> +Action: ``INC_TCP_ACK``
> +^^^^^^^^^^^^^^^^^^^^^^^
> +
> +Increase acknowledgment number in the outermost TCP header.
> +Value to increase TCP acknowledgment number by is a big-endian 32 bit integer.
> +
> +Using this action on non-matching traffic will result in undefined behavior.
> +
> +Action: ``DEC_TCP_ACK``
> +^^^^^^^^^^^^^^^^^^^^^^^
> +
> +Decrease acknowledgment number in the outermost TCP header.
> +Value to decrease TCP acknowledgment number by is a big-endian 32 bit integer.
> +
> +Using this action on non-matching traffic will result in undefined behavior.
> +
>   Negative types
>   ~~~~~~~~~~~~~~
>   
> diff --git a/lib/librte_ethdev/rte_flow.c b/lib/librte_ethdev/rte_flow.c
> index 3277be1..0c9f6c6 100644
> --- a/lib/librte_ethdev/rte_flow.c
> +++ b/lib/librte_ethdev/rte_flow.c
> @@ -143,6 +143,10 @@ struct rte_flow_desc_data {
>   	MK_FLOW_ACTION(SET_TTL, sizeof(struct rte_flow_action_set_ttl)),
>   	MK_FLOW_ACTION(SET_MAC_SRC, sizeof(struct rte_flow_action_set_mac)),
>   	MK_FLOW_ACTION(SET_MAC_DST, sizeof(struct rte_flow_action_set_mac)),
> +	MK_FLOW_ACTION(INC_TCP_SEQ, sizeof(rte_be32_t)),
> +	MK_FLOW_ACTION(DEC_TCP_SEQ, sizeof(rte_be32_t)),
> +	MK_FLOW_ACTION(INC_TCP_ACK, sizeof(rte_be32_t)),
> +	MK_FLOW_ACTION(DEC_TCP_ACK, sizeof(rte_be32_t)),
>   };
>   
>   static int
> diff --git a/lib/librte_ethdev/rte_flow.h b/lib/librte_ethdev/rte_flow.h
> index 2232856..28445f4 100644
> --- a/lib/librte_ethdev/rte_flow.h
> +++ b/lib/librte_ethdev/rte_flow.h
> @@ -1651,6 +1651,38 @@ enum rte_flow_action_type {
>   	 * See struct rte_flow_action_set_mac.
>   	 */
>   	RTE_FLOW_ACTION_TYPE_SET_MAC_DST,
> +
> +	/**
> +	 * Increase sequence number in the outermost TCP header.
> +	 *
> +	 * Using this action on non-matching traffic will result in
> +	 * undefined behavior.
> +	 */
> +	RTE_FLOW_ACTION_TYPE_INC_TCP_SEQ,
> +
> +	/**
> +	 * Decrease sequence number in the outermost TCP header.
> +	 *
> +	 * Using this action on non-matching traffic will result in
> +	 * undefined behavior.
> +	 */
> +	RTE_FLOW_ACTION_TYPE_DEC_TCP_SEQ,
> +
> +	/**
> +	 * Increase acknowledgment number in the outermost TCP header.
> +	 *
> +	 * Using this action on non-matching traffic will result in
> +	 * undefined behavior.
> +	 */
> +	RTE_FLOW_ACTION_TYPE_INC_TCP_ACK,
> +
> +	/**
> +	 * Decrease acknowledgment number in the outermost TCP header.
> +	 *
> +	 * Using this action on non-matching traffic will result in
> +	 * undefined behavior.
> +	 */
> +	RTE_FLOW_ACTION_TYPE_DEC_TCP_ACK,
>   };
>   
>   /**

Other actions have type of configuration data description in a comment just
before the action enum element. I'm not sure why it is skipped here.
It is really vital information.