netdev - [PATCH v4 net-next] tipc: adjust tipc_nodeid2string() to return string length

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Message-ID: <20250926074113.914399-1-dmantipov@yandex.ru>
Date: Fri, 26 Sep 2025 10:41:13 +0300
From: Dmitry Antipov <dmantipov@...dex.ru>
To: Tung Quang Nguyen <tung.quang.nguyen@....tech>
Cc: Simon Horman <horms@...nel.org>,
	Jon Maloy <jmaloy@...hat.com>,
	"David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	tipc-discussion@...ts.sourceforge.net,
	netdev@...r.kernel.org,
	Dmitry Antipov <dmantipov@...dex.ru>
Subject: [PATCH v4 net-next] tipc: adjust tipc_nodeid2string() to return string length

Since the value returned by 'tipc_nodeid2string()' is not used, the
function may be adjusted to return the length of the result, which
is helpful to drop a few calls to 'strlen()' in 'tipc_link_create()'
and 'tipc_link_bc_create()'. Compile tested only.

Signed-off-by: Dmitry Antipov <dmantipov@...dex.ru>
---
v4: revert to v2's behavior and prefer NODE_ID_LEN over
    explicit constant (Tung Quang Nguyen)
v3: convert to check against NODE_ID_LEN (Simon Horman)
v2: adjusted to target net-next (Tung Quang Nguyen)
---
 net/tipc/addr.c | 6 +++---
 net/tipc/addr.h | 2 +-
 net/tipc/link.c | 9 +++------
 3 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/net/tipc/addr.c b/net/tipc/addr.c
index fd0796269eed..6f5c54cbf8d9 100644
--- a/net/tipc/addr.c
+++ b/net/tipc/addr.c
@@ -79,7 +79,7 @@ void tipc_set_node_addr(struct net *net, u32 addr)
 	pr_info("Node number set to %u\n", addr);
 }
 
-char *tipc_nodeid2string(char *str, u8 *id)
+int tipc_nodeid2string(char *str, u8 *id)
 {
 	int i;
 	u8 c;
@@ -109,7 +109,7 @@ char *tipc_nodeid2string(char *str, u8 *id)
 	if (i == NODE_ID_LEN) {
 		memcpy(str, id, NODE_ID_LEN);
 		str[NODE_ID_LEN] = 0;
-		return str;
+		return i;
 	}
 
 	/* Translate to hex string */
@@ -120,5 +120,5 @@ char *tipc_nodeid2string(char *str, u8 *id)
 	for (i = NODE_ID_STR_LEN - 2; str[i] == '0'; i--)
 		str[i] = 0;
 
-	return str;
+	return i + 1;
 }
diff --git a/net/tipc/addr.h b/net/tipc/addr.h
index 93f82398283d..a113cf7e1f89 100644
--- a/net/tipc/addr.h
+++ b/net/tipc/addr.h
@@ -130,6 +130,6 @@ static inline int in_own_node(struct net *net, u32 addr)
 bool tipc_in_scope(bool legacy_format, u32 domain, u32 addr);
 void tipc_set_node_id(struct net *net, u8 *id);
 void tipc_set_node_addr(struct net *net, u32 addr);
-char *tipc_nodeid2string(char *str, u8 *id);
+int tipc_nodeid2string(char *str, u8 *id);
 
 #endif
diff --git a/net/tipc/link.c b/net/tipc/link.c
index 3ee44d731700..931f55f781a1 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -495,11 +495,9 @@ bool tipc_link_create(struct net *net, char *if_name, int bearer_id,
 
 	/* Set link name for unicast links only */
 	if (peer_id) {
-		tipc_nodeid2string(self_str, tipc_own_id(net));
-		if (strlen(self_str) > 16)
+		if (tipc_nodeid2string(self_str, tipc_own_id(net)) > NODE_ID_LEN)
 			sprintf(self_str, "%x", self);
-		tipc_nodeid2string(peer_str, peer_id);
-		if (strlen(peer_str) > 16)
+		if (tipc_nodeid2string(peer_str, peer_id) > NODE_ID_LEN)
 			sprintf(peer_str, "%x", peer);
 	}
 	/* Peer i/f name will be completed by reset/activate message */
@@ -570,8 +568,7 @@ bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, u8 *peer_id,
 	if (peer_id) {
 		char peer_str[NODE_ID_STR_LEN] = {0,};
 
-		tipc_nodeid2string(peer_str, peer_id);
-		if (strlen(peer_str) > 16)
+		if (tipc_nodeid2string(peer_str, peer_id) > NODE_ID_LEN)
 			sprintf(peer_str, "%x", peer);
 		/* Broadcast receiver link name: "broadcast-link:<peer>" */
 		snprintf(l->name, sizeof(l->name), "%s:%s", tipc_bclink_name,
-- 
2.51.0