netdev - [PATCH 1/3] igb: Link IRQs to NAPI instances

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Message-Id: <20250210-igb_irq-v1-1-bde078cdb9df@linutronix.de>
Date: Mon, 10 Feb 2025 10:19:35 +0100
From: Kurt Kanzenbach <kurt@...utronix.de>
To: Tony Nguyen <anthony.l.nguyen@...el.com>, 
 Przemek Kitszel <przemyslaw.kitszel@...el.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>, 
 Joe Damato <jdamato@...tly.com>, intel-wired-lan@...ts.osuosl.org, 
 netdev@...r.kernel.org, Kurt Kanzenbach <kurt@...utronix.de>
Subject: [PATCH 1/3] igb: Link IRQs to NAPI instances

Link IRQs to NAPI instances via netdev-genl API. This allows users to query
that information via netlink:

|$ ./tools/net/ynl/pyynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
|                               --dump napi-get --json='{"ifindex": 2}'
|[{'defer-hard-irqs': 0,
|  'gro-flush-timeout': 0,
|  'id': 8204,
|  'ifindex': 2,
|  'irq': 127,
|  'irq-suspend-timeout': 0},
| {'defer-hard-irqs': 0,
|  'gro-flush-timeout': 0,
|  'id': 8203,
|  'ifindex': 2,
|  'irq': 126,
|  'irq-suspend-timeout': 0},
| {'defer-hard-irqs': 0,
|  'gro-flush-timeout': 0,
|  'id': 8202,
|  'ifindex': 2,
|  'irq': 125,
|  'irq-suspend-timeout': 0},
| {'defer-hard-irqs': 0,
|  'gro-flush-timeout': 0,
|  'id': 8201,
|  'ifindex': 2,
|  'irq': 124,
|  'irq-suspend-timeout': 0}]
|$ cat /proc/interrupts | grep enp2s0
|123:          0          1 IR-PCI-MSIX-0000:02:00.0   0-edge      enp2s0
|124:          0          7 IR-PCI-MSIX-0000:02:00.0   1-edge      enp2s0-TxRx-0
|125:          0          0 IR-PCI-MSIX-0000:02:00.0   2-edge      enp2s0-TxRx-1
|126:          0          5 IR-PCI-MSIX-0000:02:00.0   3-edge      enp2s0-TxRx-2
|127:          0          0 IR-PCI-MSIX-0000:02:00.0   4-edge      enp2s0-TxRx-3

Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>
---
 drivers/net/ethernet/intel/igb/igb_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index d368b753a4675d01b5dfa50dee4cd218e6a5e14b..d4128d19cc08f62f95682069bb5ed9b8bbbf10cb 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -947,6 +947,9 @@ static int igb_request_msix(struct igb_adapter *adapter)
 				  q_vector);
 		if (err)
 			goto err_free;
+
+		netif_napi_set_irq(&q_vector->napi,
+				   adapter->msix_entries[vector].vector);
 	}
 
 	igb_configure_msix(adapter);

-- 
2.39.5