[dpdk-dev] [PATCH v2 11/27] event/dlb2: add v2.5 unmap queue

[Timothy McDaniel <timothy.mcdaniel@intel.com>]

Update low level functions to account for new register map
and hardware access macros.

Signed-off-by: Timothy McDaniel <timothy.mcdaniel@intel.com>
---
 drivers/event/dlb2/pf/base/dlb2_resource.c    | 331 ------------------
 .../event/dlb2/pf/base/dlb2_resource_new.c    | 298 ++++++++++++++++
 2 files changed, 298 insertions(+), 331 deletions(-)

diff --git a/drivers/event/dlb2/pf/base/dlb2_resource.c b/drivers/event/dlb2/pf/base/dlb2_resource.c
index d59df5e39..ab5b080c1 100644
--- a/drivers/event/dlb2/pf/base/dlb2_resource.c
+++ b/drivers/event/dlb2/pf/base/dlb2_resource.c
@@ -1225,26 +1225,6 @@ dlb2_get_domain_used_dir_pq(struct dlb2_hw *hw,
 	return NULL;
 }
 
-static bool
-dlb2_port_find_slot_with_pending_map_queue(struct dlb2_ldb_port *port,
-					   struct dlb2_ldb_queue *queue,
-					   int *slot)
-{
-	int i;
-
-	for (i = 0; i < DLB2_MAX_NUM_QIDS_PER_LDB_CQ; i++) {
-		struct dlb2_ldb_port_qid_map *map = &port->qid_map[i];
-
-		if (map->state == DLB2_QUEUE_UNMAP_IN_PROG_PENDING_MAP &&
-		    map->pending_qid == queue->id.phys_id)
-			break;
-	}
-
-	*slot = i;
-
-	return (i < DLB2_MAX_NUM_QIDS_PER_LDB_CQ);
-}
-
 static struct dlb2_ldb_queue *
 dlb2_get_domain_ldb_queue(u32 id,
 			  bool vdev_req,
@@ -1265,317 +1245,6 @@ dlb2_get_domain_ldb_queue(u32 id,
 	return NULL;
 }
 
-static struct dlb2_ldb_port *
-dlb2_get_domain_used_ldb_port(u32 id,
-			      bool vdev_req,
-			      struct dlb2_hw_domain *domain)
-{
-	struct dlb2_list_entry *iter;
-	struct dlb2_ldb_port *port;
-	int i;
-	RTE_SET_USED(iter);
-
-	if (id >= DLB2_MAX_NUM_LDB_PORTS)
-		return NULL;
-
-	for (i = 0; i < DLB2_NUM_COS_DOMAINS; i++) {
-		DLB2_DOM_LIST_FOR(domain->used_ldb_ports[i], port, iter)
-			if ((!vdev_req && port->id.phys_id == id) ||
-			    (vdev_req && port->id.virt_id == id))
-				return port;
-
-		DLB2_DOM_LIST_FOR(domain->avail_ldb_ports[i], port, iter)
-			if ((!vdev_req && port->id.phys_id == id) ||
-			    (vdev_req && port->id.virt_id == id))
-				return port;
-	}
-
-	return NULL;
-}
-
-static void dlb2_log_unmap_qid(struct dlb2_hw *hw,
-			       u32 domain_id,
-			       struct dlb2_unmap_qid_args *args,
-			       bool vdev_req,
-			       unsigned int vdev_id)
-{
-	DLB2_HW_DBG(hw, "DLB2 unmap QID arguments:\n");
-	if (vdev_req)
-		DLB2_HW_DBG(hw, "(Request from vdev %d)\n", vdev_id);
-	DLB2_HW_DBG(hw, "\tDomain ID: %d\n",
-		    domain_id);
-	DLB2_HW_DBG(hw, "\tPort ID:   %d\n",
-		    args->port_id);
-	DLB2_HW_DBG(hw, "\tQueue ID:  %d\n",
-		    args->qid);
-	if (args->qid < DLB2_MAX_NUM_LDB_QUEUES)
-		DLB2_HW_DBG(hw, "\tQueue's num mappings:  %d\n",
-			    hw->rsrcs.ldb_queues[args->qid].num_mappings);
-}
-
-static int dlb2_verify_unmap_qid_args(struct dlb2_hw *hw,
-				      u32 domain_id,
-				      struct dlb2_unmap_qid_args *args,
-				      struct dlb2_cmd_response *resp,
-				      bool vdev_req,
-				      unsigned int vdev_id)
-{
-	enum dlb2_qid_map_state state;
-	struct dlb2_hw_domain *domain;
-	struct dlb2_ldb_queue *queue;
-	struct dlb2_ldb_port *port;
-	int slot;
-	int id;
-
-	domain = dlb2_get_domain_from_id(hw, domain_id, vdev_req, vdev_id);
-
-	if (domain == NULL) {
-		resp->status = DLB2_ST_INVALID_DOMAIN_ID;
-		return -EINVAL;
-	}
-
-	if (!domain->configured) {
-		resp->status = DLB2_ST_DOMAIN_NOT_CONFIGURED;
-		return -EINVAL;
-	}
-
-	id = args->port_id;
-
-	port = dlb2_get_domain_used_ldb_port(id, vdev_req, domain);
-
-	if (port == NULL || !port->configured) {
-		resp->status = DLB2_ST_INVALID_PORT_ID;
-		return -EINVAL;
-	}
-
-	if (port->domain_id.phys_id != domain->id.phys_id) {
-		resp->status = DLB2_ST_INVALID_PORT_ID;
-		return -EINVAL;
-	}
-
-	queue = dlb2_get_domain_ldb_queue(args->qid, vdev_req, domain);
-
-	if (queue == NULL || !queue->configured) {
-		DLB2_HW_ERR(hw, "[%s()] Can't unmap unconfigured queue %d\n",
-			    __func__, args->qid);
-		resp->status = DLB2_ST_INVALID_QID;
-		return -EINVAL;
-	}
-
-	/*
-	 * Verify that the port has the queue mapped. From the application's
-	 * perspective a queue is mapped if it is actually mapped, the map is
-	 * in progress, or the map is blocked pending an unmap.
-	 */
-	state = DLB2_QUEUE_MAPPED;
-	if (dlb2_port_find_slot_queue(port, state, queue, &slot))
-		return 0;
-
-	state = DLB2_QUEUE_MAP_IN_PROG;
-	if (dlb2_port_find_slot_queue(port, state, queue, &slot))
-		return 0;
-
-	if (dlb2_port_find_slot_with_pending_map_queue(port, queue, &slot))
-		return 0;
-
-	resp->status = DLB2_ST_INVALID_QID;
-	return -EINVAL;
-}
-
-int dlb2_hw_unmap_qid(struct dlb2_hw *hw,
-		      u32 domain_id,
-		      struct dlb2_unmap_qid_args *args,
-		      struct dlb2_cmd_response *resp,
-		      bool vdev_req,
-		      unsigned int vdev_id)
-{
-	struct dlb2_hw_domain *domain;
-	struct dlb2_ldb_queue *queue;
-	enum dlb2_qid_map_state st;
-	struct dlb2_ldb_port *port;
-	bool unmap_complete;
-	int i, ret, id;
-
-	dlb2_log_unmap_qid(hw, domain_id, args, vdev_req, vdev_id);
-
-	/*
-	 * Verify that hardware resources are available before attempting to
-	 * satisfy the request. This simplifies the error unwinding code.
-	 */
-	ret = dlb2_verify_unmap_qid_args(hw,
-					 domain_id,
-					 args,
-					 resp,
-					 vdev_req,
-					 vdev_id);
-	if (ret)
-		return ret;
-
-	domain = dlb2_get_domain_from_id(hw, domain_id, vdev_req, vdev_id);
-	if (domain == NULL) {
-		DLB2_HW_ERR(hw,
-			    "[%s():%d] Internal error: domain not found\n",
-			    __func__, __LINE__);
-		return -EFAULT;
-	}
-
-	id = args->port_id;
-
-	port = dlb2_get_domain_used_ldb_port(id, vdev_req, domain);
-	if (port == NULL) {
-		DLB2_HW_ERR(hw,
-			    "[%s():%d] Internal error: port not found\n",
-			    __func__, __LINE__);
-		return -EFAULT;
-	}
-
-	queue = dlb2_get_domain_ldb_queue(args->qid, vdev_req, domain);
-	if (queue == NULL) {
-		DLB2_HW_ERR(hw,
-			    "[%s():%d] Internal error: queue not found\n",
-			    __func__, __LINE__);
-		return -EFAULT;
-	}
-
-	/*
-	 * If the queue hasn't been mapped yet, we need to update the slot's
-	 * state and re-enable the queue's inflights.
-	 */
-	st = DLB2_QUEUE_MAP_IN_PROG;
-	if (dlb2_port_find_slot_queue(port, st, queue, &i)) {
-		if (i >= DLB2_MAX_NUM_QIDS_PER_LDB_CQ) {
-			DLB2_HW_ERR(hw,
-				    "[%s():%d] Internal error: port slot tracking failed\n",
-				    __func__, __LINE__);
-			return -EFAULT;
-		}
-
-		/*
-		 * Since the in-progress map was aborted, re-enable the QID's
-		 * inflights.
-		 */
-		if (queue->num_pending_additions == 0)
-			dlb2_ldb_queue_set_inflight_limit(hw, queue);
-
-		st = DLB2_QUEUE_UNMAPPED;
-		ret = dlb2_port_slot_state_transition(hw, port, queue, i, st);
-		if (ret)
-			return ret;
-
-		goto unmap_qid_done;
-	}
-
-	/*
-	 * If the queue mapping is on hold pending an unmap, we simply need to
-	 * update the slot's state.
-	 */
-	if (dlb2_port_find_slot_with_pending_map_queue(port, queue, &i)) {
-		if (i >= DLB2_MAX_NUM_QIDS_PER_LDB_CQ) {
-			DLB2_HW_ERR(hw,
-				    "[%s():%d] Internal error: port slot tracking failed\n",
-				    __func__, __LINE__);
-			return -EFAULT;
-		}
-
-		st = DLB2_QUEUE_UNMAP_IN_PROG;
-		ret = dlb2_port_slot_state_transition(hw, port, queue, i, st);
-		if (ret)
-			return ret;
-
-		goto unmap_qid_done;
-	}
-
-	st = DLB2_QUEUE_MAPPED;
-	if (!dlb2_port_find_slot_queue(port, st, queue, &i)) {
-		DLB2_HW_ERR(hw,
-			    "[%s()] Internal error: no available CQ slots\n",
-			    __func__);
-		return -EFAULT;
-	}
-
-	if (i >= DLB2_MAX_NUM_QIDS_PER_LDB_CQ) {
-		DLB2_HW_ERR(hw,
-			    "[%s():%d] Internal error: port slot tracking failed\n",
-			    __func__, __LINE__);
-		return -EFAULT;
-	}
-
-	/*
-	 * QID->CQ mapping removal is an asynchronous procedure. It requires
-	 * stopping the DLB2 from scheduling this CQ, draining all inflights
-	 * from the CQ, then unmapping the queue from the CQ. This function
-	 * simply marks the port as needing the queue unmapped, and (if
-	 * necessary) starts the unmapping worker thread.
-	 */
-	dlb2_ldb_port_cq_disable(hw, port);
-
-	st = DLB2_QUEUE_UNMAP_IN_PROG;
-	ret = dlb2_port_slot_state_transition(hw, port, queue, i, st);
-	if (ret)
-		return ret;
-
-	/*
-	 * Attempt to finish the unmapping now, in case the port has no
-	 * outstanding inflights. If that's not the case, this will fail and
-	 * the unmapping will be completed at a later time.
-	 */
-	unmap_complete = dlb2_domain_finish_unmap_port(hw, domain, port);
-
-	/*
-	 * If the unmapping couldn't complete immediately, launch the worker
-	 * thread (if it isn't already launched) to finish it later.
-	 */
-	if (!unmap_complete && !os_worker_active(hw))
-		os_schedule_work(hw);
-
-unmap_qid_done:
-	resp->status = 0;
-
-	return 0;
-}
-
-static void
-dlb2_log_pending_port_unmaps_args(struct dlb2_hw *hw,
-				  struct dlb2_pending_port_unmaps_args *args,
-				  bool vdev_req,
-				  unsigned int vdev_id)
-{
-	DLB2_HW_DBG(hw, "DLB unmaps in progress arguments:\n");
-	if (vdev_req)
-		DLB2_HW_DBG(hw, "(Request from VF %d)\n", vdev_id);
-	DLB2_HW_DBG(hw, "\tPort ID: %d\n", args->port_id);
-}
-
-int dlb2_hw_pending_port_unmaps(struct dlb2_hw *hw,
-				u32 domain_id,
-				struct dlb2_pending_port_unmaps_args *args,
-				struct dlb2_cmd_response *resp,
-				bool vdev_req,
-				unsigned int vdev_id)
-{
-	struct dlb2_hw_domain *domain;
-	struct dlb2_ldb_port *port;
-
-	dlb2_log_pending_port_unmaps_args(hw, args, vdev_req, vdev_id);
-
-	domain = dlb2_get_domain_from_id(hw, domain_id, vdev_req, vdev_id);
-
-	if (domain == NULL) {
-		resp->status = DLB2_ST_INVALID_DOMAIN_ID;
-		return -EINVAL;
-	}
-
-	port = dlb2_get_domain_used_ldb_port(args->port_id, vdev_req, domain);
-	if (port == NULL || !port->configured) {
-		resp->status = DLB2_ST_INVALID_PORT_ID;
-		return -EINVAL;
-	}
-
-	resp->id = port->num_pending_removals;
-
-	return 0;
-}
-
 static int dlb2_verify_start_domain_args(struct dlb2_hw *hw,
 					 u32 domain_id,
 					 struct dlb2_cmd_response *resp,
diff --git a/drivers/event/dlb2/pf/base/dlb2_resource_new.c b/drivers/event/dlb2/pf/base/dlb2_resource_new.c
index 5277a2643..181922fe3 100644
--- a/drivers/event/dlb2/pf/base/dlb2_resource_new.c
+++ b/drivers/event/dlb2/pf/base/dlb2_resource_new.c
@@ -5476,3 +5476,301 @@ int dlb2_hw_map_qid(struct dlb2_hw *hw,
 
 	return 0;
 }
+
+static void dlb2_log_unmap_qid(struct dlb2_hw *hw,
+			       u32 domain_id,
+			       struct dlb2_unmap_qid_args *args,
+			       bool vdev_req,
+			       unsigned int vdev_id)
+{
+	DLB2_HW_DBG(hw, "DLB2 unmap QID arguments:\n");
+	if (vdev_req)
+		DLB2_HW_DBG(hw, "(Request from vdev %d)\n", vdev_id);
+	DLB2_HW_DBG(hw, "\tDomain ID: %d\n",
+		    domain_id);
+	DLB2_HW_DBG(hw, "\tPort ID:   %d\n",
+		    args->port_id);
+	DLB2_HW_DBG(hw, "\tQueue ID:  %d\n",
+		    args->qid);
+	if (args->qid < DLB2_MAX_NUM_LDB_QUEUES)
+		DLB2_HW_DBG(hw, "\tQueue's num mappings:  %d\n",
+			    hw->rsrcs.ldb_queues[args->qid].num_mappings);
+}
+
+static int dlb2_verify_unmap_qid_args(struct dlb2_hw *hw,
+				      u32 domain_id,
+				      struct dlb2_unmap_qid_args *args,
+				      struct dlb2_cmd_response *resp,
+				      bool vdev_req,
+				      unsigned int vdev_id,
+				      struct dlb2_hw_domain **out_domain,
+				      struct dlb2_ldb_port **out_port,
+				      struct dlb2_ldb_queue **out_queue)
+{
+	enum dlb2_qid_map_state state;
+	struct dlb2_hw_domain *domain;
+	struct dlb2_ldb_queue *queue;
+	struct dlb2_ldb_port *port;
+	int slot;
+	int id;
+
+	domain = dlb2_get_domain_from_id(hw, domain_id, vdev_req, vdev_id);
+
+	if (!domain) {
+		resp->status = DLB2_ST_INVALID_DOMAIN_ID;
+		return -EINVAL;
+	}
+
+	if (!domain->configured) {
+		resp->status = DLB2_ST_DOMAIN_NOT_CONFIGURED;
+		return -EINVAL;
+	}
+
+	id = args->port_id;
+
+	port = dlb2_get_domain_used_ldb_port(id, vdev_req, domain);
+
+	if (!port || !port->configured) {
+		resp->status = DLB2_ST_INVALID_PORT_ID;
+		return -EINVAL;
+	}
+
+	if (port->domain_id.phys_id != domain->id.phys_id) {
+		resp->status = DLB2_ST_INVALID_PORT_ID;
+		return -EINVAL;
+	}
+
+	queue = dlb2_get_domain_ldb_queue(args->qid, vdev_req, domain);
+
+	if (!queue || !queue->configured) {
+		DLB2_HW_ERR(hw, "[%s()] Can't unmap unconfigured queue %d\n",
+			    __func__, args->qid);
+		resp->status = DLB2_ST_INVALID_QID;
+		return -EINVAL;
+	}
+
+	/*
+	 * Verify that the port has the queue mapped. From the application's
+	 * perspective a queue is mapped if it is actually mapped, the map is
+	 * in progress, or the map is blocked pending an unmap.
+	 */
+	state = DLB2_QUEUE_MAPPED;
+	if (dlb2_port_find_slot_queue(port, state, queue, &slot))
+		goto done;
+
+	state = DLB2_QUEUE_MAP_IN_PROG;
+	if (dlb2_port_find_slot_queue(port, state, queue, &slot))
+		goto done;
+
+	if (dlb2_port_find_slot_with_pending_map_queue(port, queue, &slot))
+		goto done;
+
+	resp->status = DLB2_ST_INVALID_QID;
+	return -EINVAL;
+
+done:
+	*out_domain = domain;
+	*out_port = port;
+	*out_queue = queue;
+
+	return 0;
+}
+
+/**
+ * dlb2_hw_unmap_qid() - Unmap a load-balanced queue from a load-balanced port
+ * @hw: dlb2_hw handle for a particular device.
+ * @domain_id: domain ID.
+ * @args: unmap QID arguments.
+ * @resp: response structure.
+ * @vdev_req: indicates whether this request came from a vdev.
+ * @vdev_id: If vdev_req is true, this contains the vdev's ID.
+ *
+ * This function configures the DLB to stop scheduling QEs from the specified
+ * queue to the specified port.
+ *
+ * A successful return does not necessarily mean the mapping was removed. If
+ * this function is unable to immediately unmap the queue from the port, it
+ * will add the requested operation to a per-port list of pending map/unmap
+ * operations, and (if it's not already running) launch a kernel thread that
+ * periodically attempts to process all pending operations. See
+ * dlb2_hw_map_qid() for more details.
+ *
+ * A vdev can be either an SR-IOV virtual function or a Scalable IOV virtual
+ * device.
+ *
+ * Return:
+ * Returns 0 upon success, < 0 otherwise. If an error occurs, resp->status is
+ * assigned a detailed error code from enum dlb2_error.
+ *
+ * Errors:
+ * EINVAL - A requested resource is unavailable, invalid port or queue ID, or
+ *	    the domain is not configured.
+ * EFAULT - Internal error (resp->status not set).
+ */
+int dlb2_hw_unmap_qid(struct dlb2_hw *hw,
+		      u32 domain_id,
+		      struct dlb2_unmap_qid_args *args,
+		      struct dlb2_cmd_response *resp,
+		      bool vdev_req,
+		      unsigned int vdev_id)
+{
+	struct dlb2_hw_domain *domain;
+	struct dlb2_ldb_queue *queue;
+	enum dlb2_qid_map_state st;
+	struct dlb2_ldb_port *port;
+	bool unmap_complete;
+	int i, ret;
+
+	dlb2_log_unmap_qid(hw, domain_id, args, vdev_req, vdev_id);
+
+	/*
+	 * Verify that hardware resources are available before attempting to
+	 * satisfy the request. This simplifies the error unwinding code.
+	 */
+	ret = dlb2_verify_unmap_qid_args(hw,
+					 domain_id,
+					 args,
+					 resp,
+					 vdev_req,
+					 vdev_id,
+					 &domain,
+					 &port,
+					 &queue);
+	if (ret)
+		return ret;
+
+	/*
+	 * If the queue hasn't been mapped yet, we need to update the slot's
+	 * state and re-enable the queue's inflights.
+	 */
+	st = DLB2_QUEUE_MAP_IN_PROG;
+	if (dlb2_port_find_slot_queue(port, st, queue, &i)) {
+		/*
+		 * Since the in-progress map was aborted, re-enable the QID's
+		 * inflights.
+		 */
+		if (queue->num_pending_additions == 0)
+			dlb2_ldb_queue_set_inflight_limit(hw, queue);
+
+		st = DLB2_QUEUE_UNMAPPED;
+		ret = dlb2_port_slot_state_transition(hw, port, queue, i, st);
+		if (ret)
+			return ret;
+
+		goto unmap_qid_done;
+	}
+
+	/*
+	 * If the queue mapping is on hold pending an unmap, we simply need to
+	 * update the slot's state.
+	 */
+	if (dlb2_port_find_slot_with_pending_map_queue(port, queue, &i)) {
+		st = DLB2_QUEUE_UNMAP_IN_PROG;
+		ret = dlb2_port_slot_state_transition(hw, port, queue, i, st);
+		if (ret)
+			return ret;
+
+		goto unmap_qid_done;
+	}
+
+	st = DLB2_QUEUE_MAPPED;
+	if (!dlb2_port_find_slot_queue(port, st, queue, &i)) {
+		DLB2_HW_ERR(hw,
+			    "[%s()] Internal error: no available CQ slots\n",
+			    __func__);
+		return -EFAULT;
+	}
+
+	/*
+	 * QID->CQ mapping removal is an asynchronous procedure. It requires
+	 * stopping the DLB2 from scheduling this CQ, draining all inflights
+	 * from the CQ, then unmapping the queue from the CQ. This function
+	 * simply marks the port as needing the queue unmapped, and (if
+	 * necessary) starts the unmapping worker thread.
+	 */
+	dlb2_ldb_port_cq_disable(hw, port);
+
+	st = DLB2_QUEUE_UNMAP_IN_PROG;
+	ret = dlb2_port_slot_state_transition(hw, port, queue, i, st);
+	if (ret)
+		return ret;
+
+	/*
+	 * Attempt to finish the unmapping now, in case the port has no
+	 * outstanding inflights. If that's not the case, this will fail and
+	 * the unmapping will be completed at a later time.
+	 */
+	unmap_complete = dlb2_domain_finish_unmap_port(hw, domain, port);
+
+	/*
+	 * If the unmapping couldn't complete immediately, launch the worker
+	 * thread (if it isn't already launched) to finish it later.
+	 */
+	if (!unmap_complete && !os_worker_active(hw))
+		os_schedule_work(hw);
+
+unmap_qid_done:
+	resp->status = 0;
+
+	return 0;
+}
+
+static void
+dlb2_log_pending_port_unmaps_args(struct dlb2_hw *hw,
+				  struct dlb2_pending_port_unmaps_args *args,
+				  bool vdev_req,
+				  unsigned int vdev_id)
+{
+	DLB2_HW_DBG(hw, "DLB unmaps in progress arguments:\n");
+	if (vdev_req)
+		DLB2_HW_DBG(hw, "(Request from VF %d)\n", vdev_id);
+	DLB2_HW_DBG(hw, "\tPort ID: %d\n", args->port_id);
+}
+
+/**
+ * dlb2_hw_pending_port_unmaps() - returns the number of unmap operations in
+ *	progress.
+ * @hw: dlb2_hw handle for a particular device.
+ * @domain_id: domain ID.
+ * @args: number of unmaps in progress args
+ * @resp: response structure.
+ * @vdev_req: indicates whether this request came from a vdev.
+ * @vdev_id: If vdev_req is true, this contains the vdev's ID.
+ *
+ * Return:
+ * Returns 0 upon success, < 0 otherwise. If an error occurs, resp->status is
+ * assigned a detailed error code from enum dlb2_error. If successful, resp->id
+ * contains the number of unmaps in progress.
+ *
+ * Errors:
+ * EINVAL - Invalid port ID.
+ */
+int dlb2_hw_pending_port_unmaps(struct dlb2_hw *hw,
+				u32 domain_id,
+				struct dlb2_pending_port_unmaps_args *args,
+				struct dlb2_cmd_response *resp,
+				bool vdev_req,
+				unsigned int vdev_id)
+{
+	struct dlb2_hw_domain *domain;
+	struct dlb2_ldb_port *port;
+
+	dlb2_log_pending_port_unmaps_args(hw, args, vdev_req, vdev_id);
+
+	domain = dlb2_get_domain_from_id(hw, domain_id, vdev_req, vdev_id);
+
+	if (!domain) {
+		resp->status = DLB2_ST_INVALID_DOMAIN_ID;
+		return -EINVAL;
+	}
+
+	port = dlb2_get_domain_used_ldb_port(args->port_id, vdev_req, domain);
+	if (!port || !port->configured) {
+		resp->status = DLB2_ST_INVALID_PORT_ID;
+		return -EINVAL;
+	}
+
+	resp->id = port->num_pending_removals;
+
+	return 0;
+}
-- 
2.23.0