netdev - Re: [PATCH iwl-next v3 2/4] igb: Link queues to NAPI instances

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Message-ID: <Z9rkWLEkwRJXYo2x@LQ3V64L9R2>
Date: Wed, 19 Mar 2025 08:35:52 -0700
From: Joe Damato <jdamato@...tly.com>
To: Kurt Kanzenbach <kurt@...utronix.de>
Cc: Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	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>,
	Gerhard Engleder <gerhard@...leder-embedded.com>,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org
Subject: Re: [PATCH iwl-next v3 2/4] igb: Link queues to NAPI instances

On Wed, Mar 19, 2025 at 11:26:40AM +0100, Kurt Kanzenbach wrote:
> Link queues to NAPI instances via netdev-genl API. This is required to use
> XDP/ZC busy polling. See commit 5ef44b3cb43b ("xsk: Bring back busy polling
> support") for details.
> 
> This also allows users to query the info with netlink:
> 
> |$ ./tools/net/ynl/pyynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
> |                               --dump queue-get --json='{"ifindex": 2}'
> |[{'id': 0, 'ifindex': 2, 'napi-id': 8201, 'type': 'rx'},
> | {'id': 1, 'ifindex': 2, 'napi-id': 8202, 'type': 'rx'},
> | {'id': 2, 'ifindex': 2, 'napi-id': 8203, 'type': 'rx'},
> | {'id': 3, 'ifindex': 2, 'napi-id': 8204, 'type': 'rx'},
> | {'id': 0, 'ifindex': 2, 'napi-id': 8201, 'type': 'tx'},
> | {'id': 1, 'ifindex': 2, 'napi-id': 8202, 'type': 'tx'},
> | {'id': 2, 'ifindex': 2, 'napi-id': 8203, 'type': 'tx'},
> | {'id': 3, 'ifindex': 2, 'napi-id': 8204, 'type': 'tx'}]
> 
> Add rtnl locking to PCI error handlers, because netif_queue_set_napi()
> requires the lock held.
> 
> While at __igb_open() use RCT coding style.
> 
> Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>
> ---
>  drivers/net/ethernet/intel/igb/igb.h      |  2 ++
>  drivers/net/ethernet/intel/igb/igb_main.c | 43 +++++++++++++++++++++++++++----
>  2 files changed, 40 insertions(+), 5 deletions(-)

Reviewed-by: Joe Damato <jdamato@...tly.com>