linux-kernel - Re: [PATCH v4 0/2] Bluetooth: Improve retrying of connection attempts

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Message-ID: <13f5b50e-94b7-42ea-a47b-7d6270105d1d@v0yd.nl>
Date: Wed, 7 Feb 2024 00:28:06 +0100
From: Jonas Dreßler <verdre@...d.nl>
To: Luiz Augusto von Dentz <luiz.dentz@...il.com>
Cc: Marcel Holtmann <marcel@...tmann.org>,
 Johan Hedberg <johan.hedberg@...il.com>, linux-bluetooth@...r.kernel.org,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v4 0/2] Bluetooth: Improve retrying of connection attempts

Hi Luiz,

On 06.02.24 23:22, Luiz Augusto von Dentz wrote:
> Hi Jonas,
> 
> On Tue, Feb 6, 2024 at 6:08 AM Jonas Dreßler <verdre@...d.nl> wrote:
>>
>> Since commit 4c67bc74f016 ("[Bluetooth] Support concurrent connect
>> requests"), the kernel supports trying to connect again in case the
>> bluetooth card is busy and fails to connect.
>>
>> The logic that should handle this became a bit spotty over time, and also
>> cards these days appear to fail with more errors than just "Command
>> Disallowed".
>>
>> This series refactores the handling of concurrent connection requests
>> by serializing all "Create Connection" commands for ACL connections
>> similar to how we do it for LE connections.
>>
>> ---
>>
>> v1: https://lore.kernel.org/linux-bluetooth/20240102185933.64179-1-verdre@v0yd.nl/
>> v2: https://lore.kernel.org/linux-bluetooth/20240108183938.468426-1-verdre@v0yd.nl/
>> v3: https://lore.kernel.org/linux-bluetooth/20240108224614.56900-1-verdre@v0yd.nl/
>> v4:
>>    - Removed first two commits since they are already applied
>>    - Removed a BT_DBG() message in the acl_create_connection() function
>>      while moving to hci_sync because it seemed out of place in hci_sync
>>    - Added a mention of the test failure in mgmt-tester to commit message
>>
>> Jonas Dreßler (2):
>>    Bluetooth: hci_conn: Only do ACL connections sequentially
>>    Bluetooth: Remove pending ACL connection attempts
>>
>>   include/net/bluetooth/hci.h      |  1 +
>>   include/net/bluetooth/hci_core.h |  1 -
>>   include/net/bluetooth/hci_sync.h |  3 ++
>>   net/bluetooth/hci_conn.c         | 83 +++-----------------------------
>>   net/bluetooth/hci_event.c        | 21 ++------
>>   net/bluetooth/hci_sync.c         | 70 +++++++++++++++++++++++++++
>>   6 files changed, 86 insertions(+), 93 deletions(-)
>>
>> --
>> 2.43.0
> 
> 
> Doesn't seem to work with the new test:
> 
> Sequential connect - setup complete
> Sequential connect - run
>    Create connection finished
>    Connect failed for Pair Device
>    Create connection finished
> Sequential connect - test timed out
> Sequential connect - teardown
> 

Oh you're right, it's because of the increased delay to 5.12 seconds for
sending the page timeout. We're actually waiting for connections to fail,
so the test will now take at least 5.12s * 3 instead of 2s * 3, which means
test timeout needs to be increased from 7 to more like 16 seconds.

Sorry for not catching this one, should've run the test before submitting
the patch...

Cheers,
Jonas