nvmf: allow removal of listen addresses at runtime

Change-Id: I53ffdd061ba068070f66a752780229ecfe53e737
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-on: https://review.gerrithub.io/398688
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>

include/spdk/nvmf.h

@@ -317,6 +317,18 @@ const char *spdk_nvmf_host_get_nqn(struct spdk_nvmf_host *host);
 int spdk_nvmf_subsystem_add_listener(struct spdk_nvmf_subsystem *subsystem,
 				     struct spdk_nvme_transport_id *trid);
 
+/**
+ * Stop accepting new connections on the address provided
+ *
+ * May only be performed on subsystems in the PAUSED or INACTIVE states.
+ *
+ * \param subsystem Subsystem to remove listener from
+ * \param trid The address to no longer accept connections from
+ * \return 0 on success. Negated errno value on failure.
+ */
+int spdk_nvmf_subsystem_remove_listener(struct spdk_nvmf_subsystem *subsystem,
+					const struct spdk_nvme_transport_id *trid);
+
 /**
  * Check if connections originated from the given address are allowed to connect to the subsystem.
  *

lib/nvmf/subsystem.c

@@ -700,6 +700,28 @@ spdk_nvmf_subsystem_add_listener(struct spdk_nvmf_subsystem *subsystem,
 	return 0;
 }
 
+int
+spdk_nvmf_subsystem_remove_listener(struct spdk_nvmf_subsystem *subsystem,
+				    const struct spdk_nvme_transport_id *trid)
+{
+	struct spdk_nvmf_listener *listener;
+
+	if (!(subsystem->state == SPDK_NVMF_SUBSYSTEM_INACTIVE ||
+	      subsystem->state == SPDK_NVMF_SUBSYSTEM_PAUSED)) {
+		return -EAGAIN;
+	}
+
+	listener = _spdk_nvmf_subsystem_find_listener(subsystem, trid);
+	if (listener == NULL) {
+		return -ENOENT;
+	}
+
+	TAILQ_REMOVE(&subsystem->listeners, listener, link);
+	free(listener);
+
+	return 0;
+}
+
 /*
  * TODO: this is the whitelist and will be called during connection setup
  */