netdev - Re: [PATCH net v3 2/2] virtio-net: unbreak vq resizing when coalescing is not negotiated

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Message-ID: <20240801082947-mutt-send-email-mst@kernel.org>
Date: Thu, 1 Aug 2024 08:30:44 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Heng Qi <hengqi@...ux.alibaba.com>
Cc: netdev@...r.kernel.org, Jason Wang <jasowang@...hat.com>,
	virtualization@...ts.linux.dev, Paolo Abeni <pabeni@...hat.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eugenio Pérez <eperezma@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Subject: Re: [PATCH net v3 2/2] virtio-net: unbreak vq resizing when
 coalescing is not negotiated

On Thu, Aug 01, 2024 at 08:27:39PM +0800, Heng Qi wrote:
> Don't break the resize action if the vq coalescing feature
> named VIRTIO_NET_F_VQ_NOTF_COAL is not negotiated.
> 
> Fixes: f61fe5f081cf ("virtio-net: fix the vq coalescing setting for vq resize")
> Signed-off-by: Heng Qi <hengqi@...ux.alibaba.com>
> Reviewed-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> Acked-by: Eugenio Pé rez <eperezma@...hat.com>
> Acked-by: Jason Wang <jasowang@...hat.com>
> ---
> v2->v3:
>   - Break out the feature check and the fix into separate patches.
> 
> v1->v2:
>   - Rephrase the subject.
>   - Put the feature check inside the virtnet_send_{r,t}x_ctrl_coal_vq_cmd().
> 
>  drivers/net/virtio_net.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index b1176be8fcfd..2b566d893ea3 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -3749,7 +3749,7 @@ static int virtnet_set_ringparam(struct net_device *dev,
>  			err = virtnet_send_tx_ctrl_coal_vq_cmd(vi, i,
>  							       vi->intr_coal_tx.max_usecs,
>  							       vi->intr_coal_tx.max_packets);
> -			if (err)
> +			if (err && err != -EOPNOTSUPP)
>  				return err;
>  		}
>  
> @@ -3764,7 +3764,7 @@ static int virtnet_set_ringparam(struct net_device *dev,
>  							       vi->intr_coal_rx.max_usecs,
>  							       vi->intr_coal_rx.max_packets);
>  			mutex_unlock(&vi->rq[i].dim_lock);
> -			if (err)
> +			if (err && err != -EOPNOTSUPP)
>  				return err;


This needs a comment.


>  		}
>  	}
> -- 
> 2.32.0.3.g01195cf9f