[PATCH] vhost-scsi: introduce an ioctl to get the minimum tpgt

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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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