[PATCH v7 06/18] vdpa/ifc: add block device SW live-migration

[Andy Pei]

Add SW live-migration support to block device.

Signed-off-by: Andy Pei <andy.pei at intel.com>
---
 drivers/vdpa/ifc/ifcvf_vdpa.c | 33 +++++++++++++++++++++++++++++----
 1 file changed, 29 insertions(+), 4 deletions(-)

diff --git a/drivers/vdpa/ifc/ifcvf_vdpa.c b/drivers/vdpa/ifc/ifcvf_vdpa.c
index 07fc3ca..8a260b7 100644
--- a/drivers/vdpa/ifc/ifcvf_vdpa.c
+++ b/drivers/vdpa/ifc/ifcvf_vdpa.c
@@ -312,6 +312,7 @@ struct rte_vdpa_dev_info {
 vdpa_ifcvf_stop(struct ifcvf_internal *internal)
 {
 	struct ifcvf_hw *hw = &internal->hw;
+	struct rte_vhost_vring vq;
 	uint32_t i;
 	int vid;
 	uint64_t features = 0;
@@ -319,6 +320,22 @@ struct rte_vdpa_dev_info {
 	uint64_t len;
 
 	vid = internal->vid;
+
+	/* to make sure no packet is lost for blk device
+	 * do not stop until last_avail_idx == last_used_idx
+	 */
+	if (internal->device_type == IFCVF_BLK) {
+		for (i = 0; i < hw->nr_vring; i++) {
+			rte_vhost_get_vhost_vring(internal->vid, i, &vq);
+			while (vq.avail->idx != vq.used->idx) {
+				ifcvf_notify_queue(hw, i);
+				usleep(10);
+			}
+			hw->vring[i].last_avail_idx = vq.avail->idx;
+			hw->vring[i].last_used_idx = vq.used->idx;
+		}
+	}
+
 	ifcvf_stop_hw(hw);
 
 	for (i = 0; i < hw->nr_vring; i++)
@@ -642,8 +659,10 @@ struct rte_vdpa_dev_info {
 		}
 		hw->vring[i].avail = gpa;
 
-		/* Direct I/O for Tx queue, relay for Rx queue */
-		if (i & 1) {
+		/* NET: Direct I/O for Tx queue, relay for Rx queue
+		 * BLK: relay every queue
+		 */
+		if ((internal->device_type == IFCVF_NET) && (i & 1)) {
 			gpa = hva_to_gpa(vid, (uint64_t)(uintptr_t)vq.used);
 			if (gpa == 0) {
 				DRV_LOG(ERR, "Fail to get GPA for used ring.");
@@ -693,8 +712,12 @@ struct rte_vdpa_dev_info {
 
 	for (i = 0; i < hw->nr_vring; i++) {
 		/* synchronize remaining new used entries if any */
-		if ((i & 1) == 0)
+		if (internal->device_type == IFCVF_NET) {
+			if ((i & 1) == 0)
+				update_used_ring(internal, i);
+		} else if (internal->device_type == IFCVF_BLK) {
 			update_used_ring(internal, i);
+		}
 
 		rte_vhost_get_vhost_vring(vid, i, &vq);
 		len = IFCVF_USED_RING_LEN(vq.size);
@@ -756,7 +779,9 @@ struct rte_vdpa_dev_info {
 		}
 	}
 
-	for (qid = 0; qid < q_num; qid += 2) {
+	for (qid = 0; qid < q_num; qid += 1) {
+		if ((internal->device_type == IFCVF_NET) && (qid & 1))
+			continue;
 		ev.events = EPOLLIN | EPOLLPRI;
 		/* leave a flag to mark it's for interrupt */
 		ev.data.u64 = 1 | qid << 1 |
-- 
1.8.3.1