From: Gonglei <arei.gonglei@xxxxxxxxxx>
In order to support to assign a boot order for
vhost-scsi device, we should get the tpgt for
user level (such as Qemu). and at present, we
only support the minimum tpgt can boot.
Signed-off-by: Gonglei <arei.gonglei@xxxxxxxxxx>
Signed-off-by: Bo Su <subo7@xxxxxxxxxx>
---
drivers/vhost/scsi.c | 41 +++++++++++++++++++++++++++++++++++++++++
include/uapi/linux/vhost.h | 2 ++
2 files changed, 43 insertions(+)
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index d695b16..12e79b9 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -1522,6 +1522,38 @@ err_dev:
return ret;
}
+static int vhost_scsi_get_first_tpgt(
+ struct vhost_scsi *vs,
+ struct vhost_scsi_target *t)
+{
+ struct tcm_vhost_tpg *tv_tpg;
+ struct tcm_vhost_tport *tv_tport;
+ int tpgt = -1;
+
+ mutex_lock(&tcm_vhost_mutex);
+ mutex_lock(&vs->dev.mutex);
+
+ list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) {
+ tv_tport = tv_tpg->tport;
+
+ if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
+ if (tpgt < 0)
+ tpgt = tv_tpg->tport_tpgt;
+ else if (tpgt > tv_tpg->tport_tpgt)
+ tpgt = tv_tpg->tport_tpgt;
+ }
+ }
+
+ mutex_unlock(&vs->dev.mutex);
+ mutex_unlock(&tcm_vhost_mutex);
+
+ if (tpgt < 0)
+ return -ENXIO;
+
+ t->vhost_tpgt = tpgt;
+ return 0;
+}
+
static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
{
struct vhost_virtqueue *vq;
@@ -1657,6 +1689,15 @@ vhost_scsi_ioctl(struct file *f,
if (put_user(events_missed, eventsp))
return -EFAULT;
return 0;
+ case VHOST_SCSI_GET_TPGT:
+ if (copy_from_user(&backend, argp, sizeof(backend)))
+ return -EFAULT;
+ r = vhost_scsi_get_first_tpgt(vs, &backend);
+ if (r < 0)
+ return r;
+ if (copy_to_user(argp, &backend, sizeof(backend)))
+ return -EFAULT;
+ return 0;
case VHOST_GET_FEATURES:
features = VHOST_SCSI_FEATURES;
if (copy_to_user(featurep, &features, sizeof features))
diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index bb6a5b4..5d350f7 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -155,4 +155,6 @@ struct vhost_scsi_target {
#define VHOST_SCSI_SET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x43, __u32)
#define VHOST_SCSI_GET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x44, __u32)
+#define VHOST_SCSI_GET_TPGT _IOW(VHOST_VIRTIO, 0x45, struct vhost_scsi_target)
+
#endif
--
1.7.12.4
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