[RFC v2 05/10] vhost: add ASID support to VDUSE IOTLB operations

["Eugenio Pérez" <eperezma@redhat.com>]

From: Maxime Coquelin <maxime.coquelin@redhat.com>

Make use of the newly introduced address space ID when
calling Vhost IOTLB API.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>

---
Eugenio Pérez changes:
* Use the new GET_FD2 ioctl.
* Adapt the entry.v1 accesses to new format
---
 lib/vhost/vduse.c | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/lib/vhost/vduse.c b/lib/vhost/vduse.c
index bb3a4363baad..4e1920f9441e 100644
--- a/lib/vhost/vduse.c
+++ b/lib/vhost/vduse.c
@@ -71,7 +71,7 @@ vduse_iotlb_remove_notify(uint64_t addr, uint64_t offset, uint64_t size)
 static int
 vduse_iotlb_miss(struct virtio_net *dev, int asid, uint64_t iova, uint8_t perm __rte_unused)
 {
-	struct vduse_iotlb_entry entry;
+	struct vduse_iotlb_entry_v2 entry = {};
 	uint64_t size, page_size;
 	struct stat stat;
 	void *mmap_addr;
@@ -79,8 +79,9 @@ vduse_iotlb_miss(struct virtio_net *dev, int asid, uint64_t iova, uint8_t perm _
 
 	entry.start = iova;
 	entry.last = iova + 1;
+	entry.asid = asid;
 
-	ret = ioctl(dev->vduse_dev_fd, VDUSE_IOTLB_GET_FD, &entry);
+	ret = ioctl(dev->vduse_dev_fd, VDUSE_IOTLB_GET_FD2, &entry);
 	if (ret < 0) {
 		VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to get IOTLB entry for 0x%" PRIx64,
 				iova);
@@ -90,6 +91,7 @@ vduse_iotlb_miss(struct virtio_net *dev, int asid, uint64_t iova, uint8_t perm _
 	fd = ret;
 
 	VHOST_CONFIG_LOG(dev->ifname, DEBUG, "New IOTLB entry:");
+	VHOST_CONFIG_LOG(dev->ifname, DEBUG, "\tASID: %d", entry.asid);
 	VHOST_CONFIG_LOG(dev->ifname, DEBUG, "\tIOVA: %" PRIx64 " - %" PRIx64,
 			(uint64_t)entry.start, (uint64_t)entry.last);
 	VHOST_CONFIG_LOG(dev->ifname, DEBUG, "\toffset: %" PRIx64, (uint64_t)entry.offset);
@@ -458,10 +460,24 @@ vduse_events_handler(int fd, void *arg, int *close __rte_unused)
 		resp.result = VDUSE_REQ_RESULT_OK;
 		break;
 	case VDUSE_UPDATE_IOTLB:
-		VHOST_CONFIG_LOG(dev->ifname, INFO, "\tIOVA range: %" PRIx64 " - %" PRIx64,
-				(uint64_t)req.iova.start, (uint64_t)req.iova.last);
-		vhost_user_iotlb_cache_remove(dev, 0, req.iova.start,
-				req.iova.last - req.iova.start + 1); /* ToDo: use ASID once API available, using 0 for now */
+		{
+			uint64_t start, last;
+			uint32_t asid;
+
+			if (dev->vduse_api_ver < 1) {
+				start = req.iova.start;
+				last = req.iova.last;
+				asid = 0;
+			} else {
+				start = req.iova_v2.start;
+				last = req.iova_v2.last;
+				asid = req.iova_v2.asid;
+			}
+
+			VHOST_CONFIG_LOG(dev->ifname, INFO, "\t(ASID %d) IOVA range: %" PRIx64 " - %" PRIx64,
+				asid, start, last);
+			vhost_user_iotlb_cache_remove(dev, asid, start, last - start + 1);
+		}
 		resp.result = VDUSE_REQ_RESULT_OK;
 		break;
 	case VDUSE_SET_VQ_GROUP_ASID:
-- 
2.53.0