linux-kernel - Re: [RFC PATCH 2/2] block: virtio-blk: support multi virt queues per virtio-blk device

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Date:	Mon, 16 Jun 2014 22:17:05 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Ming Lei <ming.lei@...onical.com>, Jens Axboe <axboe@...nel.dk>,
	linux-kernel@...r.kernel.org
Cc:	linux-api@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Stefan Hajnoczi <stefanha@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Ming Lei <ming.lei@...onical.com>
Subject: Re: [RFC PATCH 2/2] block: virtio-blk: support multi virt queues per virtio-blk device

Ming Lei <ming.lei@...onical.com> writes:
> +	if (virtio_has_feature(vdev, VIRTIO_BLK_F_MQ))
> +		err = virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ,
> +				   struct virtio_blk_config, num_queues,
> +				   &num_vqs);
> +	else
> +		num_vqs = 1;

This is redundant: virtio_cread_feature() checks the feature.

So, either:
        if (virtio_has_feature(vdev, VIRTIO_BLK_F_MQ))
                virtio_cread(vdev, struct virtio_blk_config, num_queues,
          		     &num_vqs);
        else
                num_vqs = 1;

Or:
	err = virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ,
			   struct virtio_blk_config, num_queues,
			   &num_vqs);
        if (err)
                num_vqs = 1;

Otherwise, the patch looks pretty straight-forward.

Cheers,
Rusty.
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