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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20240925162048.16208-2-jdamato@fastly.com>
Date: Wed, 25 Sep 2024 16:20:47 +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: [RFC net-next v2 1/2] 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 | 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