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Commit 4b7f7e20 authored by Rusty Russell's avatar Rusty Russell
Browse files

virtio: set max_segment_size and max_sectors to infinite. 



Setting max_segment_size allows more than 64k per sg element, unless
the host specified a limit.  Setting max_sectors indicates that our
max_hw_segments is the only limit.

Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent 1b4aa2fa

drivers/block/virtio_blk.c

+5 −0
Original line number Diff line number Diff line
@@ -277,6 +277,9 @@ static int virtblk_probe(struct virtio_device *vdev) 
	}

	set_capacity(vblk->disk, cap);



	/* No real sector limit. */

	blk_queue_max_sectors(vblk->disk->queue, -1U);



	/* Host can optionally specify maximum segment size and number of

	 * segments. */

	err = virtio_config_val(vdev, VIRTIO_BLK_F_SIZE_MAX,
@@ -284,6 +287,8 @@ static int virtblk_probe(struct virtio_device *vdev) 
				&v);

	if (!err)

		blk_queue_max_segment_size(vblk->disk->queue, v);

	else

		blk_queue_max_segment_size(vblk->disk->queue, -1UL);



	err = virtio_config_val(vdev, VIRTIO_BLK_F_SEG_MAX,

				offsetof(struct virtio_blk_config, seg_max),