linux-kernel - Re: [RFC net-next v2 1/2] tg3: Link IRQs to NAPI instances

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Message-ID: <CALs4sv3K7Jz=ktXPefM+kAX+nmyDnJQhXafaBSCpyuap1FtaRA@mail.gmail.com>
Date: Fri, 27 Sep 2024 09:28:05 +0530
From: Pavan Chebbi <pavan.chebbi@...adcom.com>
To: Joe Damato <jdamato@...tly.com>
Cc: netdev@...r.kernel.org, Michael Chan <mchan@...adcom.com>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC net-next v2 1/2] tg3: Link IRQs to NAPI instances

On Wed, Sep 25, 2024 at 9:51 PM Joe Damato <jdamato@...tly.com> wrote:
>
> Link IRQs to NAPI instances with netif_napi_set_irq. This information
> can be queried with the netdev-genl API.
>
> Compare the output of /proc/interrupts for my tg3 device with the output of
> netdev-genl after applying this patch:
>
> $ cat /proc/interrupts | grep eth0 | cut -f1 --delimiter=':'
>  331
>  332
>  333
>  334
>  335
>
> $ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
>                          --dump napi-get --json='{"ifindex": 2}'
>
> [{'id': 149, 'ifindex': 2, 'irq': 335},
>  {'id': 148, 'ifindex': 2, 'irq': 334},
>  {'id': 147, 'ifindex': 2, 'irq': 333},
>  {'id': 146, 'ifindex': 2, 'irq': 332},
>  {'id': 145, 'ifindex': 2, 'irq': 331}]
>
> Signed-off-by: Joe Damato <jdamato@...tly.com>
> ---
>  drivers/net/ethernet/broadcom/tg3.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
> index 378815917741..ddf0bb65c929 100644
> --- a/drivers/net/ethernet/broadcom/tg3.c
> +++ b/drivers/net/ethernet/broadcom/tg3.c
> @@ -7413,9 +7413,10 @@ static void tg3_napi_init(struct tg3 *tp)
>  {
>         int i;
>
> -       netif_napi_add(tp->dev, &tp->napi[0].napi, tg3_poll);
> -       for (i = 1; i < tp->irq_cnt; i++)
> -               netif_napi_add(tp->dev, &tp->napi[i].napi, tg3_poll_msix);
> +       for (i = 0; i < tp->irq_cnt; i++) {
> +               netif_napi_add(tp->dev, &tp->napi[i].napi, i ? tg3_poll_msix : tg3_poll);
> +               netif_napi_set_irq(&tp->napi[i].napi, tp->napi[i].irq_vec);
> +       }
>  }
>
>  static void tg3_napi_fini(struct tg3 *tp)
> --
> 2.25.1
>

Thank you. LGTM. You can use Reviewed-by: Pavan Chebbi
<pavan.chebbi@...adcom.com>

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