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

[Kalesh Anakkur Purayil <kalesh-anakkur.purayil@broadcom.com>]

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Hi Ferruh,

Sorry for the late reply. Please see inline.

On Mon, Sep 27, 2021 at 9:49 PM Ferruh Yigit <ferruh.yigit@intel.com> wrote:

> 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.
>
[Kalesh]: The recovery event we proposed was for a different purpose and
looks different from this.

In that case, PMD itself recovers from the FW error/reset conditions using
a handshaking protocol between PMD and the device FW without needing
application intervention.

I will send a new version of the patch set incorporating the comments I
received on the last version I had sent.

Regards,
Kalesh

>
>
>
> [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 */
> >
>
>

-- 
Regards,
Kalesh A P

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