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@fastly.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

On Wed, Sep 25, 2024 at 9:51 PM Joe Damato <jdamato@fastly.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@fastly.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@broadcom.com>