netdev - [patch net-next v4 4/7] devlink: extend pr_out_nested

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Message-ID: <20231027101403.958745-5-jiri@resnulli.us>
Date: Fri, 27 Oct 2023 12:14:00 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: stephen@...workplumber.org,
	dsahern@...il.com,
	daniel.machon@...rochip.com
Subject: [patch net-next v4 4/7] devlink: extend pr_out_nested_handle() to print object

From: Jiri Pirko <jiri@...dia.com>

For existing pr_out_nested_handle() user (line card), the output stays
the same. For the new users, introduce __pr_out_nested_handle()
to allow to print devlink instance as object allowing to carry
attributes in it (like netns).

Note that as __pr_out_handle_start() and pr_out_handle_end() are newly
used, the function is moved below the definitions.

Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
v3->v4:
- rebased on top of snprintf patch
v2->v3:
- new patch
---
 devlink/devlink.c | 53 +++++++++++++++++++++++++++++------------------
 1 file changed, 33 insertions(+), 20 deletions(-)

diff --git a/devlink/devlink.c b/devlink/devlink.c
index 90f6f8ff90e2..f06f3069e80a 100644
--- a/devlink/devlink.c
+++ b/devlink/devlink.c
@@ -2747,26 +2747,6 @@ static bool should_arr_last_handle_end(struct dl *dl, const char *bus_name,
 	       !cmp_arr_last_handle(dl, bus_name, dev_name);
 }
 
-static void pr_out_nested_handle(struct nlattr *nla_nested_dl)
-{
-	struct nlattr *tb[DEVLINK_ATTR_MAX + 1] = {};
-	char buf[64];
-	int err;
-
-	err = mnl_attr_parse_nested(nla_nested_dl, attr_cb, tb);
-	if (err != MNL_CB_OK)
-		return;
-
-	if (!tb[DEVLINK_ATTR_BUS_NAME] ||
-	    !tb[DEVLINK_ATTR_DEV_NAME])
-		return;
-
-	snprintf(buf, sizeof(buf), "%s/%s",
-		 mnl_attr_get_str(tb[DEVLINK_ATTR_BUS_NAME]),
-		 mnl_attr_get_str(tb[DEVLINK_ATTR_DEV_NAME]));
-	print_string(PRINT_ANY, "nested_devlink", " nested_devlink %s", buf);
-}
-
 static void __pr_out_handle_start(struct dl *dl, struct nlattr **tb,
 				  bool content, bool array)
 {
@@ -2862,6 +2842,39 @@ static void pr_out_selftests_handle_end(struct dl *dl)
 		__pr_out_newline();
 }
 
+static void __pr_out_nested_handle(struct dl *dl, struct nlattr *nla_nested_dl,
+				   bool is_object)
+{
+	struct nlattr *tb[DEVLINK_ATTR_MAX + 1] = {};
+	int err;
+
+	err = mnl_attr_parse_nested(nla_nested_dl, attr_cb, tb);
+	if (err != MNL_CB_OK)
+		return;
+
+	if (!tb[DEVLINK_ATTR_BUS_NAME] ||
+	    !tb[DEVLINK_ATTR_DEV_NAME])
+		return;
+
+	if (!is_object) {
+		char buf[64];
+
+		snprintf(buf, sizeof(buf), "%s/%s",
+			 mnl_attr_get_str(tb[DEVLINK_ATTR_BUS_NAME]),
+			 mnl_attr_get_str(tb[DEVLINK_ATTR_DEV_NAME]));
+		print_string(PRINT_ANY, "nested_devlink", " nested_devlink %s", buf);
+		return;
+	}
+
+	__pr_out_handle_start(dl, tb, false, false);
+	pr_out_handle_end(dl);
+}
+
+static void pr_out_nested_handle(struct nlattr *nla_nested_dl)
+{
+	__pr_out_nested_handle(NULL, nla_nested_dl, false);
+}
+
 static bool cmp_arr_last_port_handle(struct dl *dl, const char *bus_name,
 				     const char *dev_name, uint32_t port_index)
 {
-- 
2.41.0