RE: [PATCH v2 1/4] eventdev/eth_rx: change eventdev reconfig logic

["Jayatheerthan, Jay" <jay.jayatheerthan@intel.com>]

> -----Original Message-----
> From: Naga Harish K, S V <s.v.naga.harish.k@intel.com>
> Sent: Wednesday, December 14, 2022 12:35 PM
> To: jerinj@marvell.com; Carrillo, Erik G <erik.g.carrillo@intel.com>; Gujjar, Abhinandan S <abhinandan.gujjar@intel.com>
> Cc: dev@dpdk.org; Jayatheerthan, Jay <jay.jayatheerthan@intel.com>
> Subject: [PATCH v2 1/4] eventdev/eth_rx: change eventdev reconfig logic
> 
> When rte_event_eth_rx_adapter_create() or
> rte_event_eth_rx_adapter_create_with_params() is used for creating
> adapter instance, eventdev is reconfigured with additional
> ``rte_event_dev_config::nb_event_ports`` parameter.
> 
> This eventdev reconfig logic is enhanced to increment the
> ``rte_event_dev_config::nb_single_link_event_port_queues``
> parameter if the adapter event port config is of type
> ``RTE_EVENT_PORT_CFG_SINGLE_LINK``.
> 
> With this change the application no longer need to configure the
> eventdev with ``rte_event_dev_config::nb_single_link_event_port_queues``
> parameter required for eth_rx adapter when the adapter is created
> using above mentioned apis.
> 
> Signed-off-by: Naga Harish K S V <s.v.naga.harish.k@intel.com>
> ---
> v2:
> * Fix build error
> ---
> ---
>  .../prog_guide/event_ethernet_rx_adapter.rst   | 18 ++++++++++++++++++
>  lib/eventdev/rte_event_eth_rx_adapter.c        |  3 +++
>  2 files changed, 21 insertions(+)
> 
> diff --git a/doc/guides/prog_guide/event_ethernet_rx_adapter.rst b/doc/guides/prog_guide/event_ethernet_rx_adapter.rst
> index 116c0a27c6..8fc9be0a9d 100644
> --- a/doc/guides/prog_guide/event_ethernet_rx_adapter.rst
> +++ b/doc/guides/prog_guide/event_ethernet_rx_adapter.rst
> @@ -71,6 +71,24 @@ set to true. The function is passed the event device to be associated with
>  the adapter and port configuration for the adapter to setup an event port
>  if the adapter needs to use a service function.
> 
> +Event device configuration for service based adapter
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +When rte_event_eth_rx_adapter_create() or
> +rte_event_eth_rx_adapter_create_with_params() is used for creating
> +adapter instance, eventdev is reconfigured with additional
> +``rte_event_dev_config::nb_event_ports`` parameter.
> +This eventdev reconfig logic also increment the
> +``rte_event_dev_config::nb_single_link_event_port_queues``
> +parameter if the adapter event port config is of type
> +``RTE_EVENT_PORT_CFG_SINGLE_LINK``.
> +
> +So the application is no longer need to configure the
> +event device with ``rte_event_dev_config::nb_event_ports`` and
> +``rte_event_dev_config::nb_single_link_event_port_queues``
> +parameters required for eth_rx adapter when the adapter is created
> +using above mentioned apis.
> +
>  Adding Rx Queues to the Adapter Instance
>  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> diff --git a/lib/eventdev/rte_event_eth_rx_adapter.c b/lib/eventdev/rte_event_eth_rx_adapter.c
> index cf7bbd4d69..34aa87379e 100644
> --- a/lib/eventdev/rte_event_eth_rx_adapter.c
> +++ b/lib/eventdev/rte_event_eth_rx_adapter.c
> @@ -1532,6 +1532,9 @@ rxa_default_conf_cb(uint8_t id, uint8_t dev_id,
>  		rte_event_dev_stop(dev_id);
>  	port_id = dev_conf.nb_event_ports;
>  	dev_conf.nb_event_ports += 1;
> +	if (port_conf->event_port_cfg & RTE_EVENT_PORT_CFG_SINGLE_LINK)
> +		dev_conf.nb_single_link_event_port_queues += 1;

Can add more comments in doxygen for nb_single_link_event_port_queues and nb_event_ports fields pointing out they are configured by application with worker necessity in mind. Adapter necessity is handled in adapter create now.

This comment can be applied to other adapters as well.

> +
>  	ret = rte_event_dev_configure(dev_id, &dev_conf);
>  	if (ret) {
>  		RTE_EDEV_LOG_ERR("failed to configure event dev %u\n",
> --
> 2.25.1