On Wed, 2013-02-06 at 13:20 +0800, Asias He wrote: > This adds virtio-scsi multi-queue support to tcm_vhost. > > Guest side virtio-scsi multi-queue support can be found here: > > https://lkml.org/lkml/2012/12/18/166 > > Some initial perf numbers: > 1 queue, 4 targets, 1 lun per target > 4K request size, 50% randread + 50% randwrite: 127K/127k IOPS > > 4 queues, 4 targets, 1 lun per target > 4K request size, 50% randread + 50% randwrite: 181K/181k IOPS > Nice single LUN small block random I/O improvement here with 4x vqueues. Curious to see how virtio-scsi small block performance looks with SCSI-core to multi-LUN tcm_vhost endpoints as well.. 8-) Btw, this does not apply atop current target-pending.git/for-next with your other pending vhost patch series, and AFAICT this patch is supposed to apply on top of your last PATCH-v3, no..? --nab > Signed-off-by: Asias He <asias@xxxxxxxxxx> > --- > drivers/vhost/tcm_vhost.c | 46 +++++++++++++++++++++++++++++----------------- > drivers/vhost/tcm_vhost.h | 2 ++ > 2 files changed, 31 insertions(+), 17 deletions(-) > > diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c > index 81ecda5..9951297 100644 > --- a/drivers/vhost/tcm_vhost.c > +++ b/drivers/vhost/tcm_vhost.c > @@ -48,6 +48,7 @@ > #include <linux/virtio_net.h> /* TODO vhost.h currently depends on this */ > #include <linux/virtio_scsi.h> > #include <linux/llist.h> > +#include <linux/bitmap.h> > > #include "vhost.c" > #include "vhost.h" > @@ -59,7 +60,8 @@ enum { > VHOST_SCSI_VQ_IO = 2, > }; > > -#define VHOST_SCSI_MAX_TARGET 256 > +#define VHOST_SCSI_MAX_TARGET 256 > +#define VHOST_SCSI_MAX_VQ 128 > > struct vhost_scsi { > /* Protected by vhost_scsi->dev.mutex */ > @@ -68,7 +70,7 @@ struct vhost_scsi { > bool vs_endpoint; > > struct vhost_dev dev; > - struct vhost_virtqueue vqs[3]; > + struct vhost_virtqueue vqs[VHOST_SCSI_MAX_VQ]; > > struct vhost_work vs_completion_work; /* cmd completion work item */ > struct llist_head vs_completion_list; /* cmd completion queue */ > @@ -366,12 +368,14 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work *work) > { > struct vhost_scsi *vs = container_of(work, struct vhost_scsi, > vs_completion_work); > + DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); > struct virtio_scsi_cmd_resp v_rsp; > struct tcm_vhost_cmd *tv_cmd; > struct llist_node *llnode; > struct se_cmd *se_cmd; > - int ret; > + int ret, vq; > > + bitmap_zero(signal, VHOST_SCSI_MAX_VQ); > llnode = llist_del_all(&vs->vs_completion_list); > while (llnode) { > tv_cmd = llist_entry(llnode, struct tcm_vhost_cmd, > @@ -390,15 +394,20 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work *work) > memcpy(v_rsp.sense, tv_cmd->tvc_sense_buf, > v_rsp.sense_len); > ret = copy_to_user(tv_cmd->tvc_resp, &v_rsp, sizeof(v_rsp)); > - if (likely(ret == 0)) > - vhost_add_used(&vs->vqs[2], tv_cmd->tvc_vq_desc, 0); > - else > + if (likely(ret == 0)) { > + vhost_add_used(tv_cmd->tvc_vq, tv_cmd->tvc_vq_desc, 0); > + vq = tv_cmd->tvc_vq - vs->vqs; > + __set_bit(vq, signal); > + } else > pr_err("Faulted on virtio_scsi_cmd_resp\n"); > > vhost_scsi_free_cmd(tv_cmd); > } > > - vhost_signal(&vs->dev, &vs->vqs[2]); > + vq = -1; > + while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) > + < VHOST_SCSI_MAX_VQ) > + vhost_signal(&vs->dev, &vs->vqs[vq]); > } > > static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd( > @@ -561,9 +570,9 @@ static void tcm_vhost_submission_work(struct work_struct *work) > } > } > > -static void vhost_scsi_handle_vq(struct vhost_scsi *vs) > +static void vhost_scsi_handle_vq(struct vhost_scsi *vs, > + struct vhost_virtqueue *vq) > { > - struct vhost_virtqueue *vq = &vs->vqs[2]; > struct virtio_scsi_cmd_req v_req; > struct tcm_vhost_tpg *tv_tpg; > struct tcm_vhost_cmd *tv_cmd; > @@ -656,7 +665,7 @@ static void vhost_scsi_handle_vq(struct vhost_scsi *vs) > ret = __copy_to_user(resp, &rsp, sizeof(rsp)); > if (!ret) > vhost_add_used_and_signal(&vs->dev, > - &vs->vqs[2], head, 0); > + vq, head, 0); > else > pr_err("Faulted on virtio_scsi_cmd_resp\n"); > > @@ -678,6 +687,7 @@ static void vhost_scsi_handle_vq(struct vhost_scsi *vs) > ": %d\n", tv_cmd, exp_data_len, data_direction); > > tv_cmd->tvc_vhost = vs; > + tv_cmd->tvc_vq = vq; > > if (unlikely(vq->iov[out].iov_len != > sizeof(struct virtio_scsi_cmd_resp))) { > @@ -758,7 +768,7 @@ static void vhost_scsi_handle_kick(struct vhost_work *work) > poll.work); > struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); > > - vhost_scsi_handle_vq(vs); > + vhost_scsi_handle_vq(vs, vq); > } > > /* > @@ -879,7 +889,7 @@ err: > static int vhost_scsi_open(struct inode *inode, struct file *f) > { > struct vhost_scsi *s; > - int r; > + int r, i; > > s = kzalloc(sizeof(*s), GFP_KERNEL); > if (!s) > @@ -889,8 +899,9 @@ static int vhost_scsi_open(struct inode *inode, struct file *f) > > s->vqs[VHOST_SCSI_VQ_CTL].handle_kick = vhost_scsi_ctl_handle_kick; > s->vqs[VHOST_SCSI_VQ_EVT].handle_kick = vhost_scsi_evt_handle_kick; > - s->vqs[VHOST_SCSI_VQ_IO].handle_kick = vhost_scsi_handle_kick; > - r = vhost_dev_init(&s->dev, s->vqs, 3); > + for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) > + s->vqs[i].handle_kick = vhost_scsi_handle_kick; > + r = vhost_dev_init(&s->dev, s->vqs, VHOST_SCSI_MAX_VQ); > if (r < 0) { > kfree(s); > return r; > @@ -922,9 +933,10 @@ static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) > > static void vhost_scsi_flush(struct vhost_scsi *vs) > { > - vhost_scsi_flush_vq(vs, VHOST_SCSI_VQ_CTL); > - vhost_scsi_flush_vq(vs, VHOST_SCSI_VQ_EVT); > - vhost_scsi_flush_vq(vs, VHOST_SCSI_VQ_IO); > + int i; > + > + for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) > + vhost_scsi_flush_vq(vs, i); > } > > static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features) > diff --git a/drivers/vhost/tcm_vhost.h b/drivers/vhost/tcm_vhost.h > index 519a550..1d2ae7a 100644 > --- a/drivers/vhost/tcm_vhost.h > +++ b/drivers/vhost/tcm_vhost.h > @@ -23,6 +23,8 @@ struct tcm_vhost_cmd { > struct virtio_scsi_cmd_resp __user *tvc_resp; > /* Pointer to vhost_scsi for our device */ > struct vhost_scsi *tvc_vhost; > + /* Pointer to vhost_virtqueue for the cmd */ > + struct vhost_virtqueue *tvc_vq; > /* Pointer to vhost nexus memory */ > struct tcm_vhost_nexus *tvc_nexus; > /* The TCM I/O descriptor that is accessed via container_of() */ -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
