Re: [dpdk-dev] [PATCH] ethdev: modify comment of INTR RESET event

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 7/26/2021 7:43 AM, Chengwen Feng wrote:
> According to the definition of rte_eth_dev_reset(), the
> RTE_ETH_EVENT_INTR_RESET event could also use when PF resets.
> 

Can you please highlight the part in the 'rte_eth_dev_reset()' definition
related to the RESET event usage for PF?

> This patch modifies the comment of RTE_ETH_EVENT_INTR_RESET event, so
> that it could use in all resets.
> 

The original intention seems as the comment mentions, please check related
commits [1].

As far as I can get from below comments, usecase is,
- PF sends reset command to VFs (driver internal command)
- VF sends RESET event to application, to request reset to be performed by
application.

So event is more like a reset request from driver to application.

Overall it is OK to extend the usage of the RESET event to PF, if there is a
usecase for it. What is your usecase?
And should we extend comment (API documentation) a little more to clarify when
this even should be sent and what application should do when event received,
what do you think?

btw, cc'ed Ajit & Kales, as far as I remember in the past they suggest a recover
event, maybe relevant with this discussion.



[1]
Commit ae19955e7c86 ("i40evf: support reporting PF reset")
Commit 514302ff6e00 ("ethdev: add NIC reset operation")

> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
> ---
>  lib/ethdev/rte_ethdev.h | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/lib/ethdev/rte_ethdev.h b/lib/ethdev/rte_ethdev.h
> index d2b27c3..e6646a6 100644
> --- a/lib/ethdev/rte_ethdev.h
> +++ b/lib/ethdev/rte_ethdev.h
> @@ -3499,8 +3499,7 @@ enum rte_eth_event_type {
>  	RTE_ETH_EVENT_INTR_LSC, /**< lsc interrupt event */
>  	RTE_ETH_EVENT_QUEUE_STATE,
>  				/**< queue state event (enabled/disabled) */
> -	RTE_ETH_EVENT_INTR_RESET,
> -			/**< reset interrupt event, sent to VF on PF reset */
> +	RTE_ETH_EVENT_INTR_RESET, /**< reset interrupt event */
>  	RTE_ETH_EVENT_VF_MBOX,  /**< message from the VF received by PF */
>  	RTE_ETH_EVENT_MACSEC,   /**< MACsec offload related event */
>  	RTE_ETH_EVENT_INTR_RMV, /**< device removal event */
>