mi: add arbitration feature get function

The set feature is prohibited for the management endpoint support.

Signed-off-by: Tokunori Ikegami <[email protected]>

Author: ikegami-t

src/libnvme.map

@@ -1,5 +1,7 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
 LIBNVME_UNRELEASED {
+	global:
+		nvme_mi_admin_get_features_arbitration;
 };
 
 LIBNVME_1_14 {

src/nvme/mi.c

@@ -1398,6 +1398,31 @@ int nvme_mi_admin_get_features(nvme_mi_ctrl_t ctrl,
 	return 0;
 }
 
+static int __nvme_mi_admin_get_features(nvme_mi_ctrl_t ctrl, enum nvme_features_id fid,
+					enum nvme_get_features_sel sel, __u32 *result)
+{
+	struct nvme_get_features_args args = {
+		.args_size = sizeof(args),
+		.fid = fid,
+		.nsid = NVME_NSID_NONE,
+		.sel = sel,
+		.cdw11 = 0,
+		.uuidx = NVME_UUID_NONE,
+		.data_len = 0,
+		.data = NULL,
+		.timeout = NVME_DEFAULT_IOCTL_TIMEOUT,
+		.result = result,
+	};
+
+	return nvme_mi_admin_get_features(ctrl, &args);
+}
+
+int nvme_mi_admin_get_features_arbitration(nvme_mi_ctrl_t ctrl, enum nvme_get_features_sel sel,
+					   __u32 *result)
+{
+	return __nvme_mi_admin_get_features(ctrl, NVME_FEAT_FID_ARBITRATION, sel, result);
+}
+
 int nvme_mi_admin_set_features(nvme_mi_ctrl_t ctrl,
 			       struct nvme_set_features_args *args)
 {

src/nvme/mi.h

@@ -3137,6 +3137,18 @@ int nvme_mi_admin_security_recv(nvme_mi_ctrl_t ctrl,
 int nvme_mi_admin_get_features(nvme_mi_ctrl_t ctrl,
 			       struct nvme_get_features_args *args);
 
+/**
+ * nvme_mi_admin_get_features_arbitration() - Get arbitration feature
+ * @ctrl: Controller to send command to
+ * @sel: Select which type of attribute to return, see &enum nvme_get_features_sel
+ * @result: The feature data is returned in this argument
+ *
+ * Return: The nvme command status if a response was received (see
+ * &enum nvme_status_field) or -1 with errno set otherwise.
+ */
+int nvme_mi_admin_get_features_arbitration(nvme_mi_ctrl_t ctrl, enum nvme_get_features_sel sel,
+					   __u32 *result);
+
 /**
  * nvme_mi_admin_get_features_data() - Helper function for &nvme_mi_admin_get_features()
  * @ctrl: Controller to send command to