linux-kernel - Re: [PATCH] ath10k: snoc: enable threaded napi on WCN3990

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Message-ID: <CACTWRwvhRUFvdv06YkQEgnz1Zyig_FqCeJU06VypT0Lvzv5OXw@mail.gmail.com>
Date:   Fri, 27 Jan 2023 14:08:23 -0800
From:   Abhishek Kumar <kuabhs@...omium.org>
To:     Kalle Valo <kvalo@...nel.org>
Cc:     Manikanta Pubbisetty <quic_mpubbise@...cinc.com>,
        ath10k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH] ath10k: snoc: enable threaded napi on WCN3990

Thanks for all the comments. I will call dev_set_threaded() directly
without HW params and rollout a v2 soon.

On Thu, Jan 12, 2023 at 2:15 AM Kalle Valo <kvalo@...nel.org> wrote:
>
> Abhishek Kumar <kuabhs@...omium.org> writes:
>
> >> > --- a/drivers/net/wireless/ath/ath10k/snoc.c
> >> > +++ b/drivers/net/wireless/ath/ath10k/snoc.c
> >> > @@ -927,6 +927,9 @@ static int ath10k_snoc_hif_start(struct ath10k *ar)
> >> >
> >> >       bitmap_clear(ar_snoc->pending_ce_irqs, 0, CE_COUNT_MAX);
> >> >
> >> > +     if (ar->hw_params.enable_threaded_napi)
> >> > +             dev_set_threaded(&ar->napi_dev, true);
> >> > +
> >>
> >> Since this is done in the API specific to WCN3990, we do not need
> >> hw_param for this.
> >
> > Just so that I am clear, are you suggesting to enable this by default
> > in snoc.c, similar to what you did in
> >
> > https://lore.kernel.org/all/20220905071805.31625-2-quic_mpubbise@quicinc.com/
> >
> > If my understanding is correct and there is no objection, I can remove
> > hw_param and enable it by default on snoc.c . I used hw_param because,
> > as I see it, threaded NAPI can have some adverse effect on the cache
> > utilization and power.
>
> WCN3990 is the only device using SNOC bus so the hw_param is not needed.
> It's safe to call dev_set_threaded() in ath10k_snoc_hif_start()
> unconditionally as it only affects WCN3990.
>
> --
> https://patchwork.kernel.org/project/linux-wireless/list/
>
> https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches