tools: ynl: generate code for the devlink family

Admittedly the devlink.yaml spec is fairly limitted,
it only covers basic device get and info-get ops.
That's sufficient to be useful (monitoring FW versions
in the fleet). Plus it gives us a chance to exercise
deep nesting and directional messaging in YNL.

Signed-off-by: Jakub Kicinski <[e-mail]>

tools/net/ynl/generated/Makefile

···
 
 TOOL:=../ynl-gen-c.py
 
-GENS:=handshake fou netdev
+GENS:=devlink handshake fou netdev
 SRCS=$(patsubst %,%-user.c,${GENS})
 HDRS=$(patsubst %,%-user.h,${GENS})
 OBJS=$(patsubst %,%-user.o,${GENS})

tools/net/ynl/generated/devlink-user.c

···
+// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
+/* Do not edit directly, auto-generated from: */
+/*	Documentation/netlink/specs/devlink.yaml */
+/* YNL-GEN user source */
+
+#include <stdlib.h>
+#include "devlink-user.h"
+#include "ynl.h"
+#include <linux/devlink.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <libmnl/libmnl.h>
+#include <linux/genetlink.h>
+
+/* Enums */
+static const char * const devlink_op_strmap[] = {
+	[3] = "get",
+	[DEVLINK_CMD_INFO_GET] = "info-get",
+};
+
+const char *devlink_op_str(int op)
+{
+	if (op < 0 || op >= (int)MNL_ARRAY_SIZE(devlink_op_strmap))
+		return NULL;
+	return devlink_op_strmap[op];
+}
+
+/* Policies */
+struct ynl_policy_attr devlink_dl_info_version_policy[DEVLINK_ATTR_MAX + 1] = {
+	[DEVLINK_ATTR_INFO_VERSION_NAME] = { .name = "info-version-name", .type = YNL_PT_NUL_STR, },
+	[DEVLINK_ATTR_INFO_VERSION_VALUE] = { .name = "info-version-value", .type = YNL_PT_NUL_STR, },
+};
+
+struct ynl_policy_nest devlink_dl_info_version_nest = {
+	.max_attr = DEVLINK_ATTR_MAX,
+	.table = devlink_dl_info_version_policy,
+};
+
+struct ynl_policy_attr devlink_dl_reload_stats_entry_policy[DEVLINK_ATTR_MAX + 1] = {
+	[DEVLINK_ATTR_RELOAD_STATS_LIMIT] = { .name = "reload-stats-limit", .type = YNL_PT_U8, },
+	[DEVLINK_ATTR_RELOAD_STATS_VALUE] = { .name = "reload-stats-value", .type = YNL_PT_U32, },
+};
+
+struct ynl_policy_nest devlink_dl_reload_stats_entry_nest = {
+	.max_attr = DEVLINK_ATTR_MAX,
+	.table = devlink_dl_reload_stats_entry_policy,
+};
+
+struct ynl_policy_attr devlink_dl_reload_act_stats_policy[DEVLINK_ATTR_MAX + 1] = {
+	[DEVLINK_ATTR_RELOAD_STATS_ENTRY] = { .name = "reload-stats-entry", .type = YNL_PT_NEST, .nest = &devlink_dl_reload_stats_entry_nest, },
+};
+
+struct ynl_policy_nest devlink_dl_reload_act_stats_nest = {
+	.max_attr = DEVLINK_ATTR_MAX,
+	.table = devlink_dl_reload_act_stats_policy,
+};
+
+struct ynl_policy_attr devlink_dl_reload_act_info_policy[DEVLINK_ATTR_MAX + 1] = {
+	[DEVLINK_ATTR_RELOAD_ACTION] = { .name = "reload-action", .type = YNL_PT_U8, },
+	[DEVLINK_ATTR_RELOAD_ACTION_STATS] = { .name = "reload-action-stats", .type = YNL_PT_NEST, .nest = &devlink_dl_reload_act_stats_nest, },
+};
+
+struct ynl_policy_nest devlink_dl_reload_act_info_nest = {
+	.max_attr = DEVLINK_ATTR_MAX,
+	.table = devlink_dl_reload_act_info_policy,
+};
+
+struct ynl_policy_attr devlink_dl_reload_stats_policy[DEVLINK_ATTR_MAX + 1] = {
+	[DEVLINK_ATTR_RELOAD_ACTION_INFO] = { .name = "reload-action-info", .type = YNL_PT_NEST, .nest = &devlink_dl_reload_act_info_nest, },
+};
+
+struct ynl_policy_nest devlink_dl_reload_stats_nest = {
+	.max_attr = DEVLINK_ATTR_MAX,
+	.table = devlink_dl_reload_stats_policy,
+};
+
+struct ynl_policy_attr devlink_dl_dev_stats_policy[DEVLINK_ATTR_MAX + 1] = {
+	[DEVLINK_ATTR_RELOAD_STATS] = { .name = "reload-stats", .type = YNL_PT_NEST, .nest = &devlink_dl_reload_stats_nest, },
+	[DEVLINK_ATTR_REMOTE_RELOAD_STATS] = { .name = "remote-reload-stats", .type = YNL_PT_NEST, .nest = &devlink_dl_reload_stats_nest, },
+};
+
+struct ynl_policy_nest devlink_dl_dev_stats_nest = {
+	.max_attr = DEVLINK_ATTR_MAX,
+	.table = devlink_dl_dev_stats_policy,
+};
+
+struct ynl_policy_attr devlink_policy[DEVLINK_ATTR_MAX + 1] = {
+	[DEVLINK_ATTR_BUS_NAME] = { .name = "bus-name", .type = YNL_PT_NUL_STR, },
+	[DEVLINK_ATTR_DEV_NAME] = { .name = "dev-name", .type = YNL_PT_NUL_STR, },
+	[DEVLINK_ATTR_PORT_INDEX] = { .name = "port-index", .type = YNL_PT_U32, },
+	[DEVLINK_ATTR_INFO_DRIVER_NAME] = { .name = "info-driver-name", .type = YNL_PT_NUL_STR, },
+	[DEVLINK_ATTR_INFO_SERIAL_NUMBER] = { .name = "info-serial-number", .type = YNL_PT_NUL_STR, },
+	[DEVLINK_ATTR_INFO_VERSION_FIXED] = { .name = "info-version-fixed", .type = YNL_PT_NEST, .nest = &devlink_dl_info_version_nest, },
+	[DEVLINK_ATTR_INFO_VERSION_RUNNING] = { .name = "info-version-running", .type = YNL_PT_NEST, .nest = &devlink_dl_info_version_nest, },
+	[DEVLINK_ATTR_INFO_VERSION_STORED] = { .name = "info-version-stored", .type = YNL_PT_NEST, .nest = &devlink_dl_info_version_nest, },
+	[DEVLINK_ATTR_INFO_VERSION_NAME] = { .name = "info-version-name", .type = YNL_PT_NUL_STR, },
+	[DEVLINK_ATTR_INFO_VERSION_VALUE] = { .name = "info-version-value", .type = YNL_PT_NUL_STR, },
+	[DEVLINK_ATTR_RELOAD_FAILED] = { .name = "reload-failed", .type = YNL_PT_U8, },
+	[DEVLINK_ATTR_RELOAD_ACTION] = { .name = "reload-action", .type = YNL_PT_U8, },
+	[DEVLINK_ATTR_DEV_STATS] = { .name = "dev-stats", .type = YNL_PT_NEST, .nest = &devlink_dl_dev_stats_nest, },
+	[DEVLINK_ATTR_RELOAD_STATS] = { .name = "reload-stats", .type = YNL_PT_NEST, .nest = &devlink_dl_reload_stats_nest, },
+	[DEVLINK_ATTR_RELOAD_STATS_ENTRY] = { .name = "reload-stats-entry", .type = YNL_PT_NEST, .nest = &devlink_dl_reload_stats_entry_nest, },
+	[DEVLINK_ATTR_RELOAD_STATS_LIMIT] = { .name = "reload-stats-limit", .type = YNL_PT_U8, },
+	[DEVLINK_ATTR_RELOAD_STATS_VALUE] = { .name = "reload-stats-value", .type = YNL_PT_U32, },
+	[DEVLINK_ATTR_REMOTE_RELOAD_STATS] = { .name = "remote-reload-stats", .type = YNL_PT_NEST, .nest = &devlink_dl_reload_stats_nest, },
+	[DEVLINK_ATTR_RELOAD_ACTION_INFO] = { .name = "reload-action-info", .type = YNL_PT_NEST, .nest = &devlink_dl_reload_act_info_nest, },
+	[DEVLINK_ATTR_RELOAD_ACTION_STATS] = { .name = "reload-action-stats", .type = YNL_PT_NEST, .nest = &devlink_dl_reload_act_stats_nest, },
+};
+
+struct ynl_policy_nest devlink_nest = {
+	.max_attr = DEVLINK_ATTR_MAX,
+	.table = devlink_policy,
+};
+
+/* Common nested types */
+void devlink_dl_info_version_free(struct devlink_dl_info_version *obj)
+{
+	free(obj->info_version_name);
+	free(obj->info_version_value);
+}
+
+int devlink_dl_info_version_parse(struct ynl_parse_arg *yarg,
+				  const struct nlattr *nested)
+{
+	struct devlink_dl_info_version *dst = yarg->data;
+	const struct nlattr *attr;
+
+	mnl_attr_for_each_nested(attr, nested) {
+		if (mnl_attr_get_type(attr) == DEVLINK_ATTR_INFO_VERSION_NAME) {
+			unsigned int len;
+
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+
+			len = strnlen(mnl_attr_get_str(attr), mnl_attr_get_payload_len(attr));
+			dst->_present.info_version_name_len = len;
+			dst->info_version_name = malloc(len + 1);
+			memcpy(dst->info_version_name, mnl_attr_get_str(attr), len);
+			dst->info_version_name[len] = 0;
+		}
+		else if (mnl_attr_get_type(attr) == DEVLINK_ATTR_INFO_VERSION_VALUE) {
+			unsigned int len;
+
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+
+			len = strnlen(mnl_attr_get_str(attr), mnl_attr_get_payload_len(attr));
+			dst->_present.info_version_value_len = len;
+			dst->info_version_value = malloc(len + 1);
+			memcpy(dst->info_version_value, mnl_attr_get_str(attr), len);
+			dst->info_version_value[len] = 0;
+		}
+	}
+
+	return 0;
+}
+
+void
+devlink_dl_reload_stats_entry_free(struct devlink_dl_reload_stats_entry *obj)
+{
+}
+
+int devlink_dl_reload_stats_entry_parse(struct ynl_parse_arg *yarg,
+					const struct nlattr *nested)
+{
+	struct devlink_dl_reload_stats_entry *dst = yarg->data;
+	const struct nlattr *attr;
+
+	mnl_attr_for_each_nested(attr, nested) {
+		if (mnl_attr_get_type(attr) == DEVLINK_ATTR_RELOAD_STATS_LIMIT) {
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+			dst->_present.reload_stats_limit = 1;
+			dst->reload_stats_limit = mnl_attr_get_u8(attr);
+		}
+		else if (mnl_attr_get_type(attr) == DEVLINK_ATTR_RELOAD_STATS_VALUE) {
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+			dst->_present.reload_stats_value = 1;
+			dst->reload_stats_value = mnl_attr_get_u32(attr);
+		}
+	}
+
+	return 0;
+}
+
+void devlink_dl_reload_act_stats_free(struct devlink_dl_reload_act_stats *obj)
+{
+	unsigned int i;
+
+	for (i = 0; i < obj->n_reload_stats_entry; i++)
+		devlink_dl_reload_stats_entry_free(&obj->reload_stats_entry[i]);
+	free(obj->reload_stats_entry);
+}
+
+int devlink_dl_reload_act_stats_parse(struct ynl_parse_arg *yarg,
+				      const struct nlattr *nested)
+{
+	struct devlink_dl_reload_act_stats *dst = yarg->data;
+	unsigned int n_reload_stats_entry = 0;
+	const struct nlattr *attr;
+	struct ynl_parse_arg parg;
+	int i;
+
+	parg.ys = yarg->ys;
+
+	if (dst->reload_stats_entry)
+		return ynl_error_parse(yarg, "attribute already present (dl-reload-act-stats.reload-stats-entry)");
+
+	mnl_attr_for_each_nested(attr, nested) {
+		if (mnl_attr_get_type(attr) == DEVLINK_ATTR_RELOAD_STATS_ENTRY) {
+			n_reload_stats_entry++;
+		}
+	}
+
+	if (n_reload_stats_entry) {
+		dst->reload_stats_entry = calloc(n_reload_stats_entry, sizeof(*dst->reload_stats_entry));
+		dst->n_reload_stats_entry = n_reload_stats_entry;
+		i = 0;
+		parg.rsp_policy = &devlink_dl_reload_stats_entry_nest;
+		mnl_attr_for_each_nested(attr, nested) {
+			if (mnl_attr_get_type(attr) == DEVLINK_ATTR_RELOAD_STATS_ENTRY) {
+				parg.data = &dst->reload_stats_entry[i];
+				if (devlink_dl_reload_stats_entry_parse(&parg, attr))
+					return MNL_CB_ERROR;
+				i++;
+			}
+		}
+	}
+
+	return 0;
+}
+
+void devlink_dl_reload_act_info_free(struct devlink_dl_reload_act_info *obj)
+{
+	unsigned int i;
+
+	for (i = 0; i < obj->n_reload_action_stats; i++)
+		devlink_dl_reload_act_stats_free(&obj->reload_action_stats[i]);
+	free(obj->reload_action_stats);
+}
+
+int devlink_dl_reload_act_info_parse(struct ynl_parse_arg *yarg,
+				     const struct nlattr *nested)
+{
+	struct devlink_dl_reload_act_info *dst = yarg->data;
+	unsigned int n_reload_action_stats = 0;
+	const struct nlattr *attr;
+	struct ynl_parse_arg parg;
+	int i;
+
+	parg.ys = yarg->ys;
+
+	if (dst->reload_action_stats)
+		return ynl_error_parse(yarg, "attribute already present (dl-reload-act-info.reload-action-stats)");
+
+	mnl_attr_for_each_nested(attr, nested) {
+		if (mnl_attr_get_type(attr) == DEVLINK_ATTR_RELOAD_ACTION) {
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+			dst->_present.reload_action = 1;
+			dst->reload_action = mnl_attr_get_u8(attr);
+		}
+		else if (mnl_attr_get_type(attr) == DEVLINK_ATTR_RELOAD_ACTION_STATS) {
+			n_reload_action_stats++;
+		}
+	}
+
+	if (n_reload_action_stats) {
+		dst->reload_action_stats = calloc(n_reload_action_stats, sizeof(*dst->reload_action_stats));
+		dst->n_reload_action_stats = n_reload_action_stats;
+		i = 0;
+		parg.rsp_policy = &devlink_dl_reload_act_stats_nest;
+		mnl_attr_for_each_nested(attr, nested) {
+			if (mnl_attr_get_type(attr) == DEVLINK_ATTR_RELOAD_ACTION_STATS) {
+				parg.data = &dst->reload_action_stats[i];
+				if (devlink_dl_reload_act_stats_parse(&parg, attr))
+					return MNL_CB_ERROR;
+				i++;
+			}
+		}
+	}
+
+	return 0;
+}
+
+void devlink_dl_reload_stats_free(struct devlink_dl_reload_stats *obj)
+{
+	unsigned int i;
+
+	for (i = 0; i < obj->n_reload_action_info; i++)
+		devlink_dl_reload_act_info_free(&obj->reload_action_info[i]);
+	free(obj->reload_action_info);
+}
+
+int devlink_dl_reload_stats_parse(struct ynl_parse_arg *yarg,
+				  const struct nlattr *nested)
+{
+	struct devlink_dl_reload_stats *dst = yarg->data;
+	unsigned int n_reload_action_info = 0;
+	const struct nlattr *attr;
+	struct ynl_parse_arg parg;
+	int i;
+
+	parg.ys = yarg->ys;
+
+	if (dst->reload_action_info)
+		return ynl_error_parse(yarg, "attribute already present (dl-reload-stats.reload-action-info)");
+
+	mnl_attr_for_each_nested(attr, nested) {
+		if (mnl_attr_get_type(attr) == DEVLINK_ATTR_RELOAD_ACTION_INFO) {
+			n_reload_action_info++;
+		}
+	}
+
+	if (n_reload_action_info) {
+		dst->reload_action_info = calloc(n_reload_action_info, sizeof(*dst->reload_action_info));
+		dst->n_reload_action_info = n_reload_action_info;
+		i = 0;
+		parg.rsp_policy = &devlink_dl_reload_act_info_nest;
+		mnl_attr_for_each_nested(attr, nested) {
+			if (mnl_attr_get_type(attr) == DEVLINK_ATTR_RELOAD_ACTION_INFO) {
+				parg.data = &dst->reload_action_info[i];
+				if (devlink_dl_reload_act_info_parse(&parg, attr))
+					return MNL_CB_ERROR;
+				i++;
+			}
+		}
+	}
+
+	return 0;
+}
+
+void devlink_dl_dev_stats_free(struct devlink_dl_dev_stats *obj)
+{
+	devlink_dl_reload_stats_free(&obj->reload_stats);
+	devlink_dl_reload_stats_free(&obj->remote_reload_stats);
+}
+
+int devlink_dl_dev_stats_parse(struct ynl_parse_arg *yarg,
+			       const struct nlattr *nested)
+{
+	struct devlink_dl_dev_stats *dst = yarg->data;
+	const struct nlattr *attr;
+	struct ynl_parse_arg parg;
+
+	parg.ys = yarg->ys;
+
+	mnl_attr_for_each_nested(attr, nested) {
+		if (mnl_attr_get_type(attr) == DEVLINK_ATTR_RELOAD_STATS) {
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+			dst->_present.reload_stats = 1;
+
+			parg.rsp_policy = &devlink_dl_reload_stats_nest;
+			parg.data = &dst->reload_stats;
+			if (devlink_dl_reload_stats_parse(&parg, attr))
+				return MNL_CB_ERROR;
+		}
+		else if (mnl_attr_get_type(attr) == DEVLINK_ATTR_REMOTE_RELOAD_STATS) {
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+			dst->_present.remote_reload_stats = 1;
+
+			parg.rsp_policy = &devlink_dl_reload_stats_nest;
+			parg.data = &dst->remote_reload_stats;
+			if (devlink_dl_reload_stats_parse(&parg, attr))
+				return MNL_CB_ERROR;
+		}
+	}
+
+	return 0;
+}
+
+/* ============== DEVLINK_CMD_GET ============== */
+/* DEVLINK_CMD_GET - do */
+void devlink_get_req_free(struct devlink_get_req *req)
+{
+	free(req->bus_name);
+	free(req->dev_name);
+	free(req);
+}
+
+void devlink_get_rsp_free(struct devlink_get_rsp *rsp)
+{
+	free(rsp->bus_name);
+	free(rsp->dev_name);
+	devlink_dl_dev_stats_free(&rsp->dev_stats);
+	free(rsp);
+}
+
+int devlink_get_rsp_parse(const struct nlmsghdr *nlh, void *data)
+{
+	struct ynl_parse_arg *yarg = data;
+	struct devlink_get_rsp *dst;
+	const struct nlattr *attr;
+	struct ynl_parse_arg parg;
+
+	dst = yarg->data;
+	parg.ys = yarg->ys;
+
+	mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
+		if (mnl_attr_get_type(attr) == DEVLINK_ATTR_BUS_NAME) {
+			unsigned int len;
+
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+
+			len = strnlen(mnl_attr_get_str(attr), mnl_attr_get_payload_len(attr));
+			dst->_present.bus_name_len = len;
+			dst->bus_name = malloc(len + 1);
+			memcpy(dst->bus_name, mnl_attr_get_str(attr), len);
+			dst->bus_name[len] = 0;
+		}
+		else if (mnl_attr_get_type(attr) == DEVLINK_ATTR_DEV_NAME) {
+			unsigned int len;
+
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+
+			len = strnlen(mnl_attr_get_str(attr), mnl_attr_get_payload_len(attr));
+			dst->_present.dev_name_len = len;
+			dst->dev_name = malloc(len + 1);
+			memcpy(dst->dev_name, mnl_attr_get_str(attr), len);
+			dst->dev_name[len] = 0;
+		}
+		else if (mnl_attr_get_type(attr) == DEVLINK_ATTR_RELOAD_FAILED) {
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+			dst->_present.reload_failed = 1;
+			dst->reload_failed = mnl_attr_get_u8(attr);
+		}
+		else if (mnl_attr_get_type(attr) == DEVLINK_ATTR_RELOAD_ACTION) {
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+			dst->_present.reload_action = 1;
+			dst->reload_action = mnl_attr_get_u8(attr);
+		}
+		else if (mnl_attr_get_type(attr) == DEVLINK_ATTR_DEV_STATS) {
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+			dst->_present.dev_stats = 1;
+
+			parg.rsp_policy = &devlink_dl_dev_stats_nest;
+			parg.data = &dst->dev_stats;
+			if (devlink_dl_dev_stats_parse(&parg, attr))
+				return MNL_CB_ERROR;
+		}
+	}
+
+	return MNL_CB_OK;
+}
+
+struct devlink_get_rsp *
+devlink_get(struct ynl_sock *ys, struct devlink_get_req *req)
+{
+	struct ynl_req_state yrs = { .yarg = { .ys = ys, }, };
+	struct devlink_get_rsp *rsp;
+	struct nlmsghdr *nlh;
+	int err;
+
+	nlh = ynl_gemsg_start_req(ys, ys->family_id, DEVLINK_CMD_GET, 1);
+	ys->req_policy = &devlink_nest;
+	yrs.yarg.rsp_policy = &devlink_nest;
+
+	if (req->_present.bus_name_len)
+		mnl_attr_put_strz(nlh, DEVLINK_ATTR_BUS_NAME, req->bus_name);
+	if (req->_present.dev_name_len)
+		mnl_attr_put_strz(nlh, DEVLINK_ATTR_DEV_NAME, req->dev_name);
+
+	rsp = calloc(1, sizeof(*rsp));
+	yrs.yarg.data = rsp;
+	yrs.cb = devlink_get_rsp_parse;
+	yrs.rsp_cmd = 3;
+
+	err = ynl_exec(ys, nlh, &yrs);
+	if (err < 0)
+		goto err_free;
+
+	return rsp;
+
+err_free:
+	devlink_get_rsp_free(rsp);
+	return NULL;
+}
+
+/* DEVLINK_CMD_GET - dump */
+void devlink_get_list_free(struct devlink_get_list *rsp)
+{
+	struct devlink_get_list *next = rsp;
+
+	while ((void *)next != YNL_LIST_END) {
+		rsp = next;
+		next = rsp->next;
+
+		free(rsp->obj.bus_name);
+		free(rsp->obj.dev_name);
+		devlink_dl_dev_stats_free(&rsp->obj.dev_stats);
+		free(rsp);
+	}
+}
+
+struct devlink_get_list *devlink_get_dump(struct ynl_sock *ys)
+{
+	struct ynl_dump_state yds = {};
+	struct nlmsghdr *nlh;
+	int err;
+
+	yds.ys = ys;
+	yds.alloc_sz = sizeof(struct devlink_get_list);
+	yds.cb = devlink_get_rsp_parse;
+	yds.rsp_cmd = 3;
+	yds.rsp_policy = &devlink_nest;
+
+	nlh = ynl_gemsg_start_dump(ys, ys->family_id, DEVLINK_CMD_GET, 1);
+
+	err = ynl_exec_dump(ys, nlh, &yds);
+	if (err < 0)
+		goto free_list;
+
+	return yds.first;
+
+free_list:
+	devlink_get_list_free(yds.first);
+	return NULL;
+}
+
+/* ============== DEVLINK_CMD_INFO_GET ============== */
+/* DEVLINK_CMD_INFO_GET - do */
+void devlink_info_get_req_free(struct devlink_info_get_req *req)
+{
+	free(req->bus_name);
+	free(req->dev_name);
+	free(req);
+}
+
+void devlink_info_get_rsp_free(struct devlink_info_get_rsp *rsp)
+{
+	unsigned int i;
+
+	free(rsp->bus_name);
+	free(rsp->dev_name);
+	free(rsp->info_driver_name);
+	free(rsp->info_serial_number);
+	for (i = 0; i < rsp->n_info_version_fixed; i++)
+		devlink_dl_info_version_free(&rsp->info_version_fixed[i]);
+	free(rsp->info_version_fixed);
+	for (i = 0; i < rsp->n_info_version_running; i++)
+		devlink_dl_info_version_free(&rsp->info_version_running[i]);
+	free(rsp->info_version_running);
+	for (i = 0; i < rsp->n_info_version_stored; i++)
+		devlink_dl_info_version_free(&rsp->info_version_stored[i]);
+	free(rsp->info_version_stored);
+	free(rsp);
+}
+
+int devlink_info_get_rsp_parse(const struct nlmsghdr *nlh, void *data)
+{
+	unsigned int n_info_version_running = 0;
+	unsigned int n_info_version_stored = 0;
+	unsigned int n_info_version_fixed = 0;
+	struct ynl_parse_arg *yarg = data;
+	struct devlink_info_get_rsp *dst;
+	const struct nlattr *attr;
+	struct ynl_parse_arg parg;
+	int i;
+
+	dst = yarg->data;
+	parg.ys = yarg->ys;
+
+	if (dst->info_version_fixed)
+		return ynl_error_parse(yarg, "attribute already present (devlink.info-version-fixed)");
+	if (dst->info_version_running)
+		return ynl_error_parse(yarg, "attribute already present (devlink.info-version-running)");
+	if (dst->info_version_stored)
+		return ynl_error_parse(yarg, "attribute already present (devlink.info-version-stored)");
+
+	mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
+		if (mnl_attr_get_type(attr) == DEVLINK_ATTR_BUS_NAME) {
+			unsigned int len;
+
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+
+			len = strnlen(mnl_attr_get_str(attr), mnl_attr_get_payload_len(attr));
+			dst->_present.bus_name_len = len;
+			dst->bus_name = malloc(len + 1);
+			memcpy(dst->bus_name, mnl_attr_get_str(attr), len);
+			dst->bus_name[len] = 0;
+		}
+		else if (mnl_attr_get_type(attr) == DEVLINK_ATTR_DEV_NAME) {
+			unsigned int len;
+
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+
+			len = strnlen(mnl_attr_get_str(attr), mnl_attr_get_payload_len(attr));
+			dst->_present.dev_name_len = len;
+			dst->dev_name = malloc(len + 1);
+			memcpy(dst->dev_name, mnl_attr_get_str(attr), len);
+			dst->dev_name[len] = 0;
+		}
+		else if (mnl_attr_get_type(attr) == DEVLINK_ATTR_INFO_DRIVER_NAME) {
+			unsigned int len;
+
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+
+			len = strnlen(mnl_attr_get_str(attr), mnl_attr_get_payload_len(attr));
+			dst->_present.info_driver_name_len = len;
+			dst->info_driver_name = malloc(len + 1);
+			memcpy(dst->info_driver_name, mnl_attr_get_str(attr), len);
+			dst->info_driver_name[len] = 0;
+		}
+		else if (mnl_attr_get_type(attr) == DEVLINK_ATTR_INFO_SERIAL_NUMBER) {
+			unsigned int len;
+
+			if (ynl_attr_validate(yarg, attr))
+				return MNL_CB_ERROR;
+
+			len = strnlen(mnl_attr_get_str(attr), mnl_attr_get_payload_len(attr));
+			dst->_present.info_serial_number_len = len;
+			dst->info_serial_number = malloc(len + 1);
+			memcpy(dst->info_serial_number, mnl_attr_get_str(attr), len);
+			dst->info_serial_number[len] = 0;
+		}
+		else if (mnl_attr_get_type(attr) == DEVLINK_ATTR_INFO_VERSION_FIXED) {
+			n_info_version_fixed++;
+		}
+		else if (mnl_attr_get_type(attr) == DEVLINK_ATTR_INFO_VERSION_RUNNING) {
+			n_info_version_running++;
+		}
+		else if (mnl_attr_get_type(attr) == DEVLINK_ATTR_INFO_VERSION_STORED) {
+			n_info_version_stored++;
+		}
+	}
+
+	if (n_info_version_fixed) {
+		dst->info_version_fixed = calloc(n_info_version_fixed, sizeof(*dst->info_version_fixed));
+		dst->n_info_version_fixed = n_info_version_fixed;
+		i = 0;
+		parg.rsp_policy = &devlink_dl_info_version_nest;
+		mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
+			if (mnl_attr_get_type(attr) == DEVLINK_ATTR_INFO_VERSION_FIXED) {
+				parg.data = &dst->info_version_fixed[i];
+				if (devlink_dl_info_version_parse(&parg, attr))
+					return MNL_CB_ERROR;
+				i++;
+			}
+		}
+	}
+	if (n_info_version_running) {
+		dst->info_version_running = calloc(n_info_version_running, sizeof(*dst->info_version_running));
+		dst->n_info_version_running = n_info_version_running;
+		i = 0;
+		parg.rsp_policy = &devlink_dl_info_version_nest;
+		mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
+			if (mnl_attr_get_type(attr) == DEVLINK_ATTR_INFO_VERSION_RUNNING) {
+				parg.data = &dst->info_version_running[i];
+				if (devlink_dl_info_version_parse(&parg, attr))
+					return MNL_CB_ERROR;
+				i++;
+			}
+		}
+	}
+	if (n_info_version_stored) {
+		dst->info_version_stored = calloc(n_info_version_stored, sizeof(*dst->info_version_stored));
+		dst->n_info_version_stored = n_info_version_stored;
+		i = 0;
+		parg.rsp_policy = &devlink_dl_info_version_nest;
+		mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
+			if (mnl_attr_get_type(attr) == DEVLINK_ATTR_INFO_VERSION_STORED) {
+				parg.data = &dst->info_version_stored[i];
+				if (devlink_dl_info_version_parse(&parg, attr))
+					return MNL_CB_ERROR;
+				i++;
+			}
+		}
+	}
+
+	return MNL_CB_OK;
+}
+
+struct devlink_info_get_rsp *
+devlink_info_get(struct ynl_sock *ys, struct devlink_info_get_req *req)
+{
+	struct ynl_req_state yrs = { .yarg = { .ys = ys, }, };
+	struct devlink_info_get_rsp *rsp;
+	struct nlmsghdr *nlh;
+	int err;
+
+	nlh = ynl_gemsg_start_req(ys, ys->family_id, DEVLINK_CMD_INFO_GET, 1);
+	ys->req_policy = &devlink_nest;
+	yrs.yarg.rsp_policy = &devlink_nest;
+
+	if (req->_present.bus_name_len)
+		mnl_attr_put_strz(nlh, DEVLINK_ATTR_BUS_NAME, req->bus_name);
+	if (req->_present.dev_name_len)
+		mnl_attr_put_strz(nlh, DEVLINK_ATTR_DEV_NAME, req->dev_name);
+
+	rsp = calloc(1, sizeof(*rsp));
+	yrs.yarg.data = rsp;
+	yrs.cb = devlink_info_get_rsp_parse;
+	yrs.rsp_cmd = DEVLINK_CMD_INFO_GET;
+
+	err = ynl_exec(ys, nlh, &yrs);
+	if (err < 0)
+		goto err_free;
+
+	return rsp;
+
+err_free:
+	devlink_info_get_rsp_free(rsp);
+	return NULL;
+}
+
+const struct ynl_family ynl_devlink_family =  {
+	.name		= "devlink",
+};

tools/net/ynl/generated/devlink-user.h

···
+/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
+/* Do not edit directly, auto-generated from: */
+/*	Documentation/netlink/specs/devlink.yaml */
+/* YNL-GEN user header */
+
+#ifndef _LINUX_DEVLINK_GEN_H
+#define _LINUX_DEVLINK_GEN_H
+
+#include <stdlib.h>
+#include <string.h>
+#include <linux/types.h>
+#include <linux/devlink.h>
+
+struct ynl_sock;
+
+extern const struct ynl_family ynl_devlink_family;
+
+/* Enums */
+const char *devlink_op_str(int op);
+
+/* Common nested types */
+struct devlink_dl_info_version {
+	struct {
+		__u32 info_version_name_len;
+		__u32 info_version_value_len;
+	} _present;
+
+	char *info_version_name;
+	char *info_version_value;
+};
+
+struct devlink_dl_reload_stats_entry {
+	struct {
+		__u32 reload_stats_limit:1;
+		__u32 reload_stats_value:1;
+	} _present;
+
+	__u8 reload_stats_limit;
+	__u32 reload_stats_value;
+};
+
+struct devlink_dl_reload_act_stats {
+	unsigned int n_reload_stats_entry;
+	struct devlink_dl_reload_stats_entry *reload_stats_entry;
+};
+
+struct devlink_dl_reload_act_info {
+	struct {
+		__u32 reload_action:1;
+	} _present;
+
+	__u8 reload_action;
+	unsigned int n_reload_action_stats;
+	struct devlink_dl_reload_act_stats *reload_action_stats;
+};
+
+struct devlink_dl_reload_stats {
+	unsigned int n_reload_action_info;
+	struct devlink_dl_reload_act_info *reload_action_info;
+};
+
+struct devlink_dl_dev_stats {
+	struct {
+		__u32 reload_stats:1;
+		__u32 remote_reload_stats:1;
+	} _present;
+
+	struct devlink_dl_reload_stats reload_stats;
+	struct devlink_dl_reload_stats remote_reload_stats;
+};
+
+/* ============== DEVLINK_CMD_GET ============== */
+/* DEVLINK_CMD_GET - do */
+struct devlink_get_req {
+	struct {
+		__u32 bus_name_len;
+		__u32 dev_name_len;
+	} _present;
+
+	char *bus_name;
+	char *dev_name;
+};
+
+static inline struct devlink_get_req *devlink_get_req_alloc(void)
+{
+	return calloc(1, sizeof(struct devlink_get_req));
+}
+void devlink_get_req_free(struct devlink_get_req *req);
+
+static inline void
+devlink_get_req_set_bus_name(struct devlink_get_req *req, const char *bus_name)
+{
+	free(req->bus_name);
+	req->_present.bus_name_len = strlen(bus_name);
+	req->bus_name = malloc(req->_present.bus_name_len + 1);
+	memcpy(req->bus_name, bus_name, req->_present.bus_name_len);
+	req->bus_name[req->_present.bus_name_len] = 0;
+}
+static inline void
+devlink_get_req_set_dev_name(struct devlink_get_req *req, const char *dev_name)
+{
+	free(req->dev_name);
+	req->_present.dev_name_len = strlen(dev_name);
+	req->dev_name = malloc(req->_present.dev_name_len + 1);
+	memcpy(req->dev_name, dev_name, req->_present.dev_name_len);
+	req->dev_name[req->_present.dev_name_len] = 0;
+}
+
+struct devlink_get_rsp {
+	struct {
+		__u32 bus_name_len;
+		__u32 dev_name_len;
+		__u32 reload_failed:1;
+		__u32 reload_action:1;
+		__u32 dev_stats:1;
+	} _present;
+
+	char *bus_name;
+	char *dev_name;
+	__u8 reload_failed;
+	__u8 reload_action;
+	struct devlink_dl_dev_stats dev_stats;
+};
+
+void devlink_get_rsp_free(struct devlink_get_rsp *rsp);
+
+/*
+ * Get devlink instances.
+ */
+struct devlink_get_rsp *
+devlink_get(struct ynl_sock *ys, struct devlink_get_req *req);
+
+/* DEVLINK_CMD_GET - dump */
+struct devlink_get_list {
+	struct devlink_get_list *next;
+	struct devlink_get_rsp obj __attribute__ ((aligned (8)));
+};
+
+void devlink_get_list_free(struct devlink_get_list *rsp);
+
+struct devlink_get_list *devlink_get_dump(struct ynl_sock *ys);
+
+/* ============== DEVLINK_CMD_INFO_GET ============== */
+/* DEVLINK_CMD_INFO_GET - do */
+struct devlink_info_get_req {
+	struct {
+		__u32 bus_name_len;
+		__u32 dev_name_len;
+	} _present;
+
+	char *bus_name;
+	char *dev_name;
+};
+
+static inline struct devlink_info_get_req *devlink_info_get_req_alloc(void)
+{
+	return calloc(1, sizeof(struct devlink_info_get_req));
+}
+void devlink_info_get_req_free(struct devlink_info_get_req *req);
+
+static inline void
+devlink_info_get_req_set_bus_name(struct devlink_info_get_req *req,
+				  const char *bus_name)
+{
+	free(req->bus_name);
+	req->_present.bus_name_len = strlen(bus_name);
+	req->bus_name = malloc(req->_present.bus_name_len + 1);
+	memcpy(req->bus_name, bus_name, req->_present.bus_name_len);
+	req->bus_name[req->_present.bus_name_len] = 0;
+}
+static inline void
+devlink_info_get_req_set_dev_name(struct devlink_info_get_req *req,
+				  const char *dev_name)
+{
+	free(req->dev_name);
+	req->_present.dev_name_len = strlen(dev_name);
+	req->dev_name = malloc(req->_present.dev_name_len + 1);
+	memcpy(req->dev_name, dev_name, req->_present.dev_name_len);
+	req->dev_name[req->_present.dev_name_len] = 0;
+}
+
+struct devlink_info_get_rsp {
+	struct {
+		__u32 bus_name_len;
+		__u32 dev_name_len;
+		__u32 info_driver_name_len;
+		__u32 info_serial_number_len;
+	} _present;
+
+	char *bus_name;
+	char *dev_name;
+	char *info_driver_name;
+	char *info_serial_number;
+	unsigned int n_info_version_fixed;
+	struct devlink_dl_info_version *info_version_fixed;
+	unsigned int n_info_version_running;
+	struct devlink_dl_info_version *info_version_running;
+	unsigned int n_info_version_stored;
+	struct devlink_dl_info_version *info_version_stored;
+};
+
+void devlink_info_get_rsp_free(struct devlink_info_get_rsp *rsp);
+
+/*
+ * Get device information, like driver name, hardware and firmware versions etc.
+ */
+struct devlink_info_get_rsp *
+devlink_info_get(struct ynl_sock *ys, struct devlink_info_get_req *req);
+
+#endif /* _LINUX_DEVLINK_GEN_H */