Hi, I would like to understand why the Source device L2CAP mtu is always set to the remote device mtu during L2CAP connection? https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git/tree/net/bluetooth/l2cap_core.c#n3370 https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git/tree/net/bluetooth/l2cap_core.c#n3474 I tried to set the specific MTU for specific profile connection( For Ex: A2DP connection - PSM 25) patch mentioned below, but the same is not reflected because of the below code. https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git/tree/net/bluetooth/l2cap_core.c#n3474 Here the patch to set the MTU from the use space bluez. diff --git a/profiles/audio/a2dp.c b/profiles/audio/a2dp.c index 58e1534a4..7d8a718c0 100644 --- a/profiles/audio/a2dp.c +++ b/profiles/audio/a2dp.c @@ -1573,6 +1573,7 @@ static bool a2dp_server_listen(struct a2dp_server *server) BT_IO_OPT_SOURCE_BDADDR, btd_adapter_get_address(server->adapter), BT_IO_OPT_PSM, AVDTP_PSM, + BT_IO_OPT_OMTU, AVDTP_MTU, BT_IO_OPT_SEC_LEVEL, BT_IO_SEC_MEDIUM, BT_IO_OPT_MASTER, true, BT_IO_OPT_INVALID); diff --git a/profiles/audio/avdtp.c b/profiles/audio/avdtp.c index 51ead684a..786702cec 100644 --- a/profiles/audio/avdtp.c +++ b/profiles/audio/avdtp.c @@ -2394,6 +2394,7 @@ static GIOChannel *l2cap_connect(struct avdtp *session) BT_IO_OPT_DEST_BDADDR, device_get_address(session->device), BT_IO_OPT_PSM, AVDTP_PSM, + BT_IO_OPT_OMTU, AVDTP_MTU, BT_IO_OPT_SEC_LEVEL, BT_IO_SEC_MEDIUM, BT_IO_OPT_INVALID); if (!io) { diff --git a/profiles/audio/avdtp.h b/profiles/audio/avdtp.h index 621a6e3cf..372b2579d 100644 --- a/profiles/audio/avdtp.h +++ b/profiles/audio/avdtp.h Can you please suggest what is the best way to set the L2CAP mtu as user defined. Thanks Chethan
