netdev - [patch iproute2-next v5 7/7] devlink: print nested devlink handle for devlink dev

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Date: Tue,  7 Nov 2023 09:06:07 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: stephen@...workplumber.org,
	dsahern@...il.com,
	daniel.machon@...rochip.com
Subject: [patch iproute2-next v5 7/7] devlink: print nested devlink handle for devlink dev

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

Devlink dev may contain one or more nested devlink instances.
Print them using previously introduced pr_out_nested_handle_obj()
helper.

Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
v2->v3:
- rebased on top of new patch "devlink: extend pr_out_nested_handle() to
  print object" and previous patch to use pr_out_nested_handle_obj()
---
 devlink/devlink.c | 30 ++++++++++++++++++++++++++----
 1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/devlink/devlink.c b/devlink/devlink.c
index ae31e7cf34e3..f999e5940c63 100644
--- a/devlink/devlink.c
+++ b/devlink/devlink.c
@@ -3860,13 +3860,35 @@ static void pr_out_reload_data(struct dl *dl, struct nlattr **tb)
 	pr_out_object_end(dl);
 }
 
+static void pr_out_dev_nested(struct dl *dl, const struct nlmsghdr *nlh)
+{
+	int i = 0, count = 0;
+	struct nlattr *attr;
+
+	mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
+		if (mnl_attr_get_type(attr) == DEVLINK_ATTR_NESTED_DEVLINK)
+			count++;
+	}
+	if (!count)
+		return;
+
+	mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) {
+		if (mnl_attr_get_type(attr) != DEVLINK_ATTR_NESTED_DEVLINK)
+			continue;
+		pr_out_nested_handle_obj(dl, attr, i == 0, i == count - 1);
+		i++;
+	}
+}
 
-static void pr_out_dev(struct dl *dl, struct nlattr **tb)
+static void pr_out_dev(struct dl *dl, const struct nlmsghdr *nlh,
+		       struct nlattr **tb)
 {
 	if ((tb[DEVLINK_ATTR_RELOAD_FAILED] && mnl_attr_get_u8(tb[DEVLINK_ATTR_RELOAD_FAILED])) ||
-	    (tb[DEVLINK_ATTR_DEV_STATS] && dl->stats)) {
+	    (tb[DEVLINK_ATTR_DEV_STATS] && dl->stats) ||
+	     tb[DEVLINK_ATTR_NESTED_DEVLINK]) {
 		__pr_out_handle_start(dl, tb, true, false);
 		pr_out_reload_data(dl, tb);
+		pr_out_dev_nested(dl, nlh);
 		pr_out_handle_end(dl);
 	} else {
 		pr_out_handle(dl, tb);
@@ -3883,7 +3905,7 @@ static int cmd_dev_show_cb(const struct nlmsghdr *nlh, void *data)
 	if (!tb[DEVLINK_ATTR_BUS_NAME] || !tb[DEVLINK_ATTR_DEV_NAME])
 		return MNL_CB_ERROR;
 
-	pr_out_dev(dl, tb);
+	pr_out_dev(dl, nlh, tb);
 	return MNL_CB_OK;
 }
 
@@ -6810,7 +6832,7 @@ static int cmd_mon_show_cb(const struct nlmsghdr *nlh, void *data)
 			return MNL_CB_ERROR;
 		pr_out_mon_header(genl->cmd);
 		dl->stats = true;
-		pr_out_dev(dl, tb);
+		pr_out_dev(dl, nlh, tb);
 		pr_out_mon_footer();
 		break;
 	case DEVLINK_CMD_PORT_GET: /* fall through */
-- 
2.41.0