linux-kernel - Re: [PATCH net 3/4] virtio_net: Sync rss config to device when virtnet

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Message-ID: <ZyqAI--BgVBo1Kt1@LQ3V64L9R2>
Date: Tue, 5 Nov 2024 12:29:23 -0800
From: Joe Damato <jdamato@...tly.com>
To: Philo Lu <lulie@...ux.alibaba.com>
Cc: netdev@...r.kernel.org, mst@...hat.com, jasowang@...hat.com,
	xuanzhuo@...ux.alibaba.com, eperezma@...hat.com,
	andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, andrew@...nix.com,
	virtualization@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 3/4] virtio_net: Sync rss config to device when
 virtnet_probe

On Mon, Nov 04, 2024 at 04:57:05PM +0800, Philo Lu wrote:
> During virtnet_probe, default rss configuration is initialized, but was
> not committed to the device. This patch fix this by sending rss command
> after device ready in virtnet_probe. Otherwise, the actual rss
> configuration used by device can be different with that read by user
> from driver, which may confuse the user.
> 
> If the command committing fails, driver rss will be disabled.
> 
> Fixes: c7114b1249fa ("drivers/net/virtio_net: Added basic RSS support.")
> Signed-off-by: Philo Lu <lulie@...ux.alibaba.com>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> ---
>  drivers/net/virtio_net.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index acc3e5dc112e..59d9fdf562e0 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -6584,6 +6584,15 @@ static int virtnet_probe(struct virtio_device *vdev)
>  
>  	virtio_device_ready(vdev);
>  
> +	if (vi->has_rss || vi->has_rss_hash_report) {
> +		if (!virtnet_commit_rss_command(vi)) {
> +			dev_warn(&vdev->dev, "RSS disabled because committing failed.\n");
> +			dev->hw_features &= ~NETIF_F_RXHASH;
> +			vi->has_rss_hash_report = false;
> +			vi->has_rss = false;
> +		}
> +	}
> +
>  	virtnet_set_queues(vi, vi->curr_queue_pairs);
>  
>  	/* a random MAC address has been assigned, notify the device.

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