netdev - [PATCH net-next 1/4] netconsole: extract message fragmentation into send_msg

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Message-Id: <20251128-netconsole_send_msg-v1-1-8cca4bbce9bc@debian.org>
Date: Fri, 28 Nov 2025 06:20:46 -0800
From: Breno Leitao <leitao@...ian.org>
To: Breno Leitao <leitao@...ian.org>, Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Shuah Khan <shuah@...nel.org>, Simon Horman <horms@...nel.org>, 
 Jonathan Corbet <corbet@....net>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, linux-doc@...r.kernel.org, 
 gustavold@...il.com, asantostc@...il.com, calvin@...nvd.org, 
 kernel-team@...a.com, Petr Mladek <pmladek@...e.com>
Subject: [PATCH net-next 1/4] netconsole: extract message fragmentation
 into send_msg_udp()

Extract the message fragmentation logic from write_msg() into a
dedicated send_msg_udp() function. This improves code readability
and prepares for future enhancements.

The new send_msg_udp() function handles splitting messages that
exceed MAX_PRINT_CHUNK into smaller fragments and sending them
sequentially. This function is placed before send_ext_msg_udp()
to maintain a logical ordering of related functions.

No functional changes - this is purely a refactoring commit.

Signed-off-by: Breno Leitao <leitao@...ian.org>
Reviewed-by: Petr Mladek <pmladek@...e.com>
---
 drivers/net/netconsole.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 9cb4dfc242f5..dc3bd7c9b049 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -1725,12 +1725,24 @@ static void write_ext_msg(struct console *con, const char *msg,
 	spin_unlock_irqrestore(&target_list_lock, flags);
 }

+static void send_msg_udp(struct netconsole_target *nt, const char *msg,
+			 unsigned int len)
+{
+	const char *tmp = msg;
+	int frag, left = len;
+
+	while (left > 0) {
+		frag = min(left, MAX_PRINT_CHUNK);
+		send_udp(nt, tmp, frag);
+		tmp += frag;
+		left -= frag;
+	}
+}
+
 static void write_msg(struct console *con, const char *msg, unsigned int len)
 {
-	int frag, left;
 	unsigned long flags;
 	struct netconsole_target *nt;
-	const char *tmp;

 	if (oops_only && !oops_in_progress)
 		return;
@@ -1747,13 +1759,7 @@ static void write_msg(struct console *con, const char *msg, unsigned int len)
 			 * at least one target if we die inside here, instead
 			 * of unnecessarily keeping all targets in lock-step.
 			 */
-			tmp = msg;
-			for (left = len; left;) {
-				frag = min(left, MAX_PRINT_CHUNK);
-				send_udp(nt, tmp, frag);
-				tmp += frag;
-				left -= frag;
-			}
+			send_msg_udp(nt, msg, len);
 		}
 	}
 	spin_unlock_irqrestore(&target_list_lock, flags);

-- 
2.47.3