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* [PATCH BlueZ v1] l2test: Attempt to update BT_SNDMTU/omtu when using -D
@ 2026-03-04 17:59 Luiz Augusto von Dentz
  2026-03-04 18:55 ` [BlueZ,v1] " bluez.test.bot
  0 siblings, 1 reply; 2+ messages in thread
From: Luiz Augusto von Dentz @ 2026-03-04 17:59 UTC (permalink / raw)
  To: linux-bluetooth

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

This attempts to update the omtu using getsockopt(BT_SNDMTU) since it
can be updated after the initial connection and there are tests such
L2CAP/ECFC/BV-23-C that attempts to check that the updated MTU is used.

Fixes: https://github.com/bluez/bluez/issues/1941
---
 tools/l2test.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tools/l2test.c b/tools/l2test.c
index aa05f5247c5e..48fff715f23b 100644
--- a/tools/l2test.c
+++ b/tools/l2test.c
@@ -957,6 +957,7 @@ static void do_send(int sk)
 {
 	uint32_t seq;
 	int i, fd, len, buflen, size, sent;
+	socklen_t optlen;
 
 	syslog(LOG_INFO, "Sending ...");
 
@@ -1021,8 +1022,15 @@ static void do_send(int sk)
 		}
 
 		if (num_frames && send_delay && count &&
-						!(seq % (count + seq_start)))
+						!(seq % (count + seq_start))) {
 			usleep(send_delay);
+			/* Attempt to update the BT_SNDMTU/omtu */
+			if (getsockopt(sk, SOL_BLUETOOTH, BT_SNDMTU, &omtu,
+					&optlen) < 0)
+				syslog(LOG_ERR,
+					"getsockopt(BT_SNDMTU): %s (%d)",
+					strerror(errno), errno);
+		}
 	}
 }
 
-- 
2.53.0


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2026-03-04 17:59 [PATCH BlueZ v1] l2test: Attempt to update BT_SNDMTU/omtu when using -D Luiz Augusto von Dentz
2026-03-04 18:55 ` [BlueZ,v1] " bluez.test.bot

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