Hello:
This patch was applied to bluetooth/bluetooth-next.git (master)
by Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>:
On Thu, 12 Jun 2025 09:50:34 +0200 you wrote:
> 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 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
>
> [...]
Here is the summary with links:
- Bluetooth: L2CAP: Fix L2CAP MTU negotiation
https://git.kernel.org/bluetooth/bluetooth-next/c/d5c2d5e0f1d3
You are awesome, thank you!
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