From: fdanis-oss <noreply@github.com>
To: linux-bluetooth@vger.kernel.org
Subject: [bluez/bluez] 50da77: obexd: client: Fix connect RX MTU
Date: Tue, 26 Aug 2025 02:15:02 -0700 [thread overview]
Message-ID: <bluez/bluez/push/refs/heads/995586/000000-50da77@github.com> (raw)
Branch: refs/heads/995586
Home: https://github.com/bluez/bluez
Commit: 50da77ff57d484042901c8486d345d378ece453f
https://github.com/bluez/bluez/commit/50da77ff57d484042901c8486d345d378ece453f
Author: Frédéric Danis <frederic.danis@collabora.com>
Date: 2025-08-26 (Tue, 26 Aug 2025)
Changed paths:
M obexd/client/session.c
Log Message:
-----------
obexd: client: Fix connect RX MTU
OBEX download from iPhone is currently slow due to small packet size
used to transfer data which doesn't follow the MTU negotiated during
L2CAP connection, i.e. 672 bytes instead of 32767:
< ACL Data TX: Handle 11 flags 0x00 dlen 12
L2CAP: Connection Request (0x02) ident 18 len 4
PSM: 4103 (0x1007)
Source CID: 72
> ACL Data RX: Handle 11 flags 0x02 dlen 16
L2CAP: Connection Response (0x03) ident 18 len 8
Destination CID: 14608
Source CID: 72
Result: Connection successful (0x0000)
Status: No further information available (0x0000)
< ACL Data TX: Handle 11 flags 0x00 dlen 27
L2CAP: Configure Request (0x04) ident 20 len 19
Destination CID: 14608
Flags: 0x0000
Option: Maximum Transmission Unit (0x01) [mandatory]
MTU: 32767
Option: Retransmission and Flow Control (0x04) [mandatory]
Mode: Enhanced Retransmission (0x03)
TX window size: 63
Max transmit: 3
Retransmission timeout: 2000
Monitor timeout: 12000
Maximum PDU size: 1009
> ACL Data RX: Handle 11 flags 0x02 dlen 26
L2CAP: Configure Request (0x04) ident 72 len 18
Destination CID: 72
Flags: 0x0000
Option: Retransmission and Flow Control (0x04) [mandatory]
Mode: Enhanced Retransmission (0x03)
TX window size: 32
Max transmit: 255
Retransmission timeout: 0
Monitor timeout: 0
Maximum PDU size: 65527
Option: Frame Check Sequence (0x05) [mandatory]
FCS: 16-bit FCS (0x01)
< ACL Data TX: Handle 11 flags 0x00 dlen 29
L2CAP: Configure Response (0x05) ident 72 len 21
Source CID: 14608
Flags: 0x0000
Result: Success (0x0000)
Option: Maximum Transmission Unit (0x01) [mandatory]
MTU: 672
Option: Retransmission and Flow Control (0x04) [mandatory]
Mode: Enhanced Retransmission (0x03)
TX window size: 32
Max transmit: 255
Retransmission timeout: 2000
Monitor timeout: 12000
Maximum PDU size: 1009
> ACL Data RX: Handle 11 flags 0x02 dlen 32
L2CAP: Configure Response (0x05) ident 20 len 24
Source CID: 72
Flags: 0x0000
Result: Success (0x0000)
Option: Maximum Transmission Unit (0x01) [mandatory]
MTU: 32767
Option: Retransmission and Flow Control (0x04) [mandatory]
Mode: Enhanced Retransmission (0x03)
TX window size: 63
Max transmit: 3
Retransmission timeout: 2000
Monitor timeout: 12000
Maximum PDU size: 1009
Option: Frame Check Sequence (0x05) [mandatory]
FCS: 16-bit FCS (0x01)
...
< ACL Data TX: Handle 11 flags 0x00 dlen 34
Channel: 14608 len 30 ctrl 0x0000 [PSM 4103 mode Enhanced Retransmission (0x03)] {chan 8}
I-frame: Unsegmented TxSeq 0 ReqSeq 0
00 00 80 00 1a 10 00 02 a0 46 00 13 71 63 dd 54 .........F..qc.T
4a 7e 11 e2 b4 7c 00 50 c2 49 00 48 b4 55 J~...|.P.I.H.U
...
> ACL Data RX: Handle 11 flags 0x02 dlen 680
Channel: 72 len 676 ctrl 0x0202 [PSM 4103 mode Enhanced Retransmission (0x03)] {chan 8}
I-frame: Unsegmented TxSeq 1 ReqSeq 2
< ACL Data TX: Handle 11 flags 0x00 dlen 13
Channel: 14608 len 9 ctrl 0x0204 [PSM 4103 mode Enhanced Retransmission (0x03)] {chan 8}
I-frame: Unsegmented TxSeq 2 ReqSeq 2
> ACL Data RX: Handle 11 flags 0x02 dlen 680
Channel: 72 len 676 ctrl 0x0304 [PSM 4103 mode Enhanced Retransmission (0x03)] {chan 8}
I-frame: Unsegmented TxSeq 2 ReqSeq 3
The OBEX CONNECT request uses the negotiated output MTU (672, 0x02a0)
as the maximum OBEX packet length the client is able to receive
instead of the negotiated input MTU (32767).
This commit swap rx_mtu and tx_mtu as g_obex_new() is defined as:
GObex *g_obex_new(GIOChannel *io, GObexTransportType transport_type,
gssize rx_mtu, gssize tx_mtu);
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