netdev - [patch iproute2-main REPOST] devlink: load ifname map on demand from ifname_map_rev

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Date:   Fri, 25 Nov 2022 10:12:51 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     stephen@...workplumber.org, dsahern@...il.com
Subject: [patch iproute2-main REPOST] devlink: load ifname map on demand from ifname_map_rev_lookup() as well

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

Commit 5cddbb274eab ("devlink: load port-ifname map on demand") changed
the ifname map to be loaded on demand from ifname_map_lookup(). However,
it didn't put this on-demand loading into ifname_map_rev_lookup() which
causes ifname_map_rev_lookup() to return -ENOENT all the time.

Fix this by triggering on-demand ifname map load
from ifname_map_rev_lookup() as well.

Fixes: 5cddbb274eab ("devlink: load port-ifname map on demand")
Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
 devlink/devlink.c | 35 +++++++++++++++++++++++++++--------
 1 file changed, 27 insertions(+), 8 deletions(-)

diff --git a/devlink/devlink.c b/devlink/devlink.c
index 8aefa101b2f8..150b4e63ead1 100644
--- a/devlink/devlink.c
+++ b/devlink/devlink.c
@@ -838,6 +838,23 @@ static int ifname_map_load(struct dl *dl)
 	return 0;
 }
 
+static int ifname_map_check_load(struct dl *dl)
+{
+	int err;
+
+	if (dl->map_loaded)
+		return 0;
+
+	err = ifname_map_load(dl);
+	if (err) {
+		pr_err("Failed to create index map\n");
+		return err;
+	}
+	dl->map_loaded = true;
+	return 0;
+}
+
+
 static int ifname_map_lookup(struct dl *dl, const char *ifname,
 			     char **p_bus_name, char **p_dev_name,
 			     uint32_t *p_port_index)
@@ -845,14 +862,10 @@ static int ifname_map_lookup(struct dl *dl, const char *ifname,
 	struct ifname_map *ifname_map;
 	int err;
 
-	if (!dl->map_loaded) {
-		err = ifname_map_load(dl);
-		if (err) {
-			pr_err("Failed to create index map\n");
-			return err;
-		}
-		dl->map_loaded = true;
-	}
+	err = ifname_map_check_load(dl);
+	if (err)
+		return err;
+
 	list_for_each_entry(ifname_map, &dl->ifname_map_list, list) {
 		if (strcmp(ifname, ifname_map->ifname) == 0) {
 			*p_bus_name = ifname_map->bus_name;
@@ -870,6 +883,12 @@ static int ifname_map_rev_lookup(struct dl *dl, const char *bus_name,
 {
 	struct ifname_map *ifname_map;
 
+	int err;
+
+	err = ifname_map_check_load(dl);
+	if (err)
+		return err;
+
 	list_for_each_entry(ifname_map, &dl->ifname_map_list, list) {
 		if (strcmp(bus_name, ifname_map->bus_name) == 0 &&
 		    strcmp(dev_name, ifname_map->dev_name) == 0 &&
-- 
2.37.3