Commit 704806ca authored by Yishai Hadas's avatar Yishai Hadas Committed by Alex Williamson
Browse files

virtio: Extend the admin command to include the result size 



Extend the admin command by incorporating a result size field.

This allows higher layers to determine the actual result size from the
backend when this information is not included in the result_sg.

The additional information introduced here will be used in subsequent
patches of this series.

Acked-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarYishai Hadas <yishaih@nvidia.com>
Link: https://lore.kernel.org/r/20241113115200.209269-3-yishaih@nvidia.com


Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent 7c1ae151

drivers/virtio/virtio_pci_modern.c

+3 −1
Original line number Diff line number Diff line
@@ -64,8 +64,10 @@ void vp_modern_avq_done(struct virtqueue *vq) 
	spin_lock_irqsave(&admin_vq->lock, flags);

	do {

		virtqueue_disable_cb(vq);

		while ((cmd = virtqueue_get_buf(vq, &len)))

		while ((cmd = virtqueue_get_buf(vq, &len))) {

			cmd->result_sg_size = len;

			complete(&cmd->completion);

		}

	} while (!virtqueue_enable_cb(vq));

	spin_unlock_irqrestore(&admin_vq->lock, flags);

}

include/linux/virtio.h

+1 −0
Original line number Diff line number Diff line
@@ -111,6 +111,7 @@ struct virtio_admin_cmd { 
	struct scatterlist *data_sg;

	struct scatterlist *result_sg;

	struct completion completion;

	u32 result_sg_size;

	int ret;

};