linux-kernel - [PATCH net-next] tg3: Link IRQs to NAPI instances

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Message-Id: <20240912155830.14688-1-jdamato@fastly.com>
Date: Thu, 12 Sep 2024 15:58:30 +0000
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: Joe Damato <jdamato@...tly.com>,
	Pavan Chebbi <pavan.chebbi@...adcom.com>,
	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>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net-next] tg3: Link IRQs to NAPI instances

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 | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 378815917741..c187b13ab3e6 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -7393,6 +7393,14 @@ static int tg3_poll(struct napi_struct *napi, int budget)
 	return work_done;
 }
 
+static void tg3_napi_set_irq(struct tg3 *tp)
+{
+	int i;
+
+	for (i = 0; i < tp->irq_cnt; i++)
+		netif_napi_set_irq(&tp->napi[i].napi, tp->napi[i].irq_vec);
+}
+
 static void tg3_napi_disable(struct tg3 *tp)
 {
 	int i;
@@ -11652,7 +11660,7 @@ static int tg3_start(struct tg3 *tp, bool reset_phy, bool test_irq,
 		goto out_ints_fini;
 
 	tg3_napi_init(tp);
-
+	tg3_napi_set_irq(tp);
 	tg3_napi_enable(tp);
 
 	for (i = 0; i < tp->irq_cnt; i++) {
-- 
2.25.1