On 15/11/2014 04:47, Ming Lei wrote:
> Since virtio_scsi has supported multi virtqueue already,
> it is natural to map the virtque to hw-queue of blk-mq.
>
> Cc: Paolo Bonzini <pbonz...@redhat.com>
> Signed-off-by: Ming Lei <ming....@canonical.com>
> ---
> V1:
> - support non-mq too
>
> drivers/scsi/virtio_scsi.c | 17 ++++++++++++++++-
> 1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
> index b83846f..d3af70e 100644
> --- a/drivers/scsi/virtio_scsi.c
> +++ b/drivers/scsi/virtio_scsi.c
> @@ -561,6 +561,15 @@ static int virtscsi_queuecommand_single(struct Scsi_Host
> *sh,
> return virtscsi_queuecommand(vscsi, &vscsi->req_vqs[0], sc);
> }
>
> +static struct virtio_scsi_vq *virtscsi_pick_vq_mq(struct virtio_scsi *vscsi,
> + struct scsi_cmnd *sc)
> +{
> + u32 tag = blk_mq_unique_tag(sc->request);
> + u16 hwq = blk_mq_unique_tag_to_hwq(tag);
> +
> + return &vscsi->req_vqs[hwq];
> +}
> +
> static struct virtio_scsi_vq *virtscsi_pick_vq(struct virtio_scsi *vscsi,
> struct virtio_scsi_target_state
> *tgt)
> {
> @@ -604,7 +613,12 @@ static int virtscsi_queuecommand_multi(struct Scsi_Host
> *sh,
> struct virtio_scsi *vscsi = shost_priv(sh);
> struct virtio_scsi_target_state *tgt =
> scsi_target(sc->device)->hostdata;
> - struct virtio_scsi_vq *req_vq = virtscsi_pick_vq(vscsi, tgt);
> + struct virtio_scsi_vq *req_vq;
> +
> + if (shost_use_blk_mq(sh))
> + req_vq = virtscsi_pick_vq_mq(vscsi, sc);
> + else
> + req_vq = virtscsi_pick_vq(vscsi, tgt);
>
> return virtscsi_queuecommand(vscsi, req_vq, sc);
> }
> @@ -983,6 +997,7 @@ static int virtscsi_probe(struct virtio_device *vdev)
> shost->max_id = num_targets;
> shost->max_channel = 0;
> shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE;
> + shost->nr_hw_queues = num_queues;
>
> if (virtio_has_feature(vdev, VIRTIO_SCSI_F_T10_PI)) {
> host_prot = SHOST_DIF_TYPE1_PROTECTION |
> SHOST_DIF_TYPE2_PROTECTION |
>
Reviewed-by: Paolo Bonzini <pbonz...@redhat.com>
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