[RFC 1/5] ethdev: add port affinity match item

[Thomas Monjalon]

21/12/2022 11:29, Jiawei Wang:
> +	/**
> +	 * Matches on the physical port affinity of the received packet.
> +	 *
> +	 * See struct rte_flow_item_port_affinity.
> +	 */
> +	RTE_FLOW_ITEM_TYPE_PORT_AFFINITY,
>  };

I'm not sure about the word "affinity".
I think you want to match on a physical port.
It could be a global physical port id or
an index in the group of physical ports connected to a single DPDK port.
In first case, the name of the item could be RTE_FLOW_ITEM_TYPE_PHY_PORT,
in the second case, the name could be RTE_FLOW_ITEM_TYPE_MHPSDP_PHY_PORT,
"MHPSDP" meaning "Multiple Hardware Ports - Single DPDK Port".
We could replace "PHY" with "HW" as well.

Note that we cannot use the new item RTE_FLOW_ITEM_TYPE_REPRESENTED_PORT
because we are in a case where multiple hardware ports are merged
in a single software represented port.


[...]
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this structure may change without prior notice
> + *
> + * RTE_FLOW_ITEM_TYPE_PORT_AFFINITY
> + *
> + * For the multiple hardware ports connect to a single DPDK port (mhpsdp),
> + * use this item to match the hardware port affinity of the packets.
> + */
> +struct rte_flow_item_port_affinity {
> +	uint8_t affinity; /**< port affinity value. */
> +};

We need to define how the port numbering is done.
Is it driver-dependent?
Does it start at 0? etc...