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 <kuba@kernel.org>

tools/net/ynl/generated/Makefile

@@ -9,7 +9,7 @@ endif
 
 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.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 */