lib/vhost: move changing vsession interrupt_mode to rte_vhost_user

This functionality is specific for rte_vhost,
so move it to appropriate file.
Renamed to include vhost_user_* prefix.

Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Change-Id: I9630902f52d4944d0d18a39dfbff05945ce2bdba
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/11024
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>

lib/vhost/rte_vhost_user.c

@@ -425,6 +425,55 @@ static const struct vhost_device_ops g_spdk_vhost_ops = {
 	.destroy_connection = destroy_connection,
 };
 
+void
+vhost_user_session_set_interrupt_mode(struct spdk_vhost_session *vsession, bool interrupt_mode)
+{
+	uint16_t i;
+	bool packed_ring;
+	int rc = 0;
+
+	packed_ring = ((vsession->negotiated_features & (1ULL << VIRTIO_F_RING_PACKED)) != 0);
+
+	for (i = 0; i < vsession->max_queues; i++) {
+		struct spdk_vhost_virtqueue *q = &vsession->virtqueue[i];
+		uint64_t num_events = 1;
+
+		/* vring.desc and vring.desc_packed are in a union struct
+		 * so q->vring.desc can replace q->vring.desc_packed.
+		 */
+		if (q->vring.desc == NULL || q->vring.size == 0) {
+			continue;
+		}
+
+		if (interrupt_mode) {
+			/* Enable I/O submission notifications, we'll be interrupting. */
+			if (packed_ring) {
+				* (volatile uint16_t *) &q->vring.device_event->flags = VRING_PACKED_EVENT_FLAG_ENABLE;
+			} else {
+				* (volatile uint16_t *) &q->vring.used->flags = 0;
+			}
+
+			/* In case of race condition, always kick vring when switch to intr */
+			rc = write(q->vring.kickfd, &num_events, sizeof(num_events));
+			if (rc < 0) {
+				SPDK_ERRLOG("failed to kick vring: %s.\n", spdk_strerror(errno));
+			}
+
+			vsession->interrupt_mode = true;
+		} else {
+			/* Disable I/O submission notifications, we'll be polling. */
+			if (packed_ring) {
+				* (volatile uint16_t *) &q->vring.device_event->flags = VRING_PACKED_EVENT_FLAG_DISABLE;
+			} else {
+				* (volatile uint16_t *) &q->vring.used->flags = VRING_USED_F_NO_NOTIFY;
+			}
+
+			vsession->interrupt_mode = false;
+		}
+	}
+}
+
+
 static enum rte_vhost_msg_result
 extern_vhost_pre_msg_handler(int vid, void *_msg)
 {

lib/vhost/vhost.c

@@ -1083,54 +1083,6 @@ vhost_dev_foreach_session(struct spdk_vhost_dev *vdev,
 	spdk_thread_send_msg(vdev->thread, foreach_session, ev_ctx);
 }
 
-void
-vhost_session_set_interrupt_mode(struct spdk_vhost_session *vsession, bool interrupt_mode)
-{
-	uint16_t i;
-	bool packed_ring;
-	int rc = 0;
-
-	packed_ring = ((vsession->negotiated_features & (1ULL << VIRTIO_F_RING_PACKED)) != 0);
-
-	for (i = 0; i < vsession->max_queues; i++) {
-		struct spdk_vhost_virtqueue *q = &vsession->virtqueue[i];
-		uint64_t num_events = 1;
-
-		/* vring.desc and vring.desc_packed are in a union struct
-		 * so q->vring.desc can replace q->vring.desc_packed.
-		 */
-		if (q->vring.desc == NULL || q->vring.size == 0) {
-			continue;
-		}
-
-		if (interrupt_mode) {
-			/* Enable I/O submission notifications, we'll be interrupting. */
-			if (packed_ring) {
-				* (volatile uint16_t *) &q->vring.device_event->flags = VRING_PACKED_EVENT_FLAG_ENABLE;
-			} else {
-				* (volatile uint16_t *) &q->vring.used->flags = 0;
-			}
-
-			/* In case of race condition, always kick vring when switch to intr */
-			rc = write(q->vring.kickfd, &num_events, sizeof(num_events));
-			if (rc < 0) {
-				SPDK_ERRLOG("failed to kick vring: %s.\n", spdk_strerror(errno));
-			}
-
-			vsession->interrupt_mode = true;
-		} else {
-			/* Disable I/O submission notifications, we'll be polling. */
-			if (packed_ring) {
-				* (volatile uint16_t *) &q->vring.device_event->flags = VRING_PACKED_EVENT_FLAG_DISABLE;
-			} else {
-				* (volatile uint16_t *) &q->vring.used->flags = VRING_USED_F_NO_NOTIFY;
-			}
-
-			vsession->interrupt_mode = false;
-		}
-	}
-}
-
 void
 vhost_dump_info_json(struct spdk_vhost_dev *vdev, struct spdk_json_write_ctx *w)
 {

lib/vhost/vhost_blk.c

@@ -1072,7 +1072,7 @@ vhost_blk_poller_set_interrupt_mode(struct spdk_poller *poller, void *cb_arg, bo
 {
 	struct spdk_vhost_blk_session *bvsession = cb_arg;
 
-	vhost_session_set_interrupt_mode(&bvsession->vsession, interrupt_mode);
+	vhost_user_session_set_interrupt_mode(&bvsession->vsession, interrupt_mode);
 }
 
 static struct spdk_vhost_blk_dev *

lib/vhost/vhost_internal.h

@@ -423,7 +423,8 @@ void vhost_dump_info_json(struct spdk_vhost_dev *vdev, struct spdk_json_write_ct
 /*
  * Set vhost session to run in interrupt or poll mode
  */
-void vhost_session_set_interrupt_mode(struct spdk_vhost_session *vsession, bool interrupt_mode);
+void vhost_user_session_set_interrupt_mode(struct spdk_vhost_session *vsession,
+		bool interrupt_mode);
 
 /*
  * Memory registration functions used in start/stop device callbacks