linux-kernel - Re: [PATCH v7 0/5] Bluetooth: Add new MGMT interface for advertising add

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Date:   Thu, 3 Dec 2020 23:01:47 +0100
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Daniel Winkler <danielwinkler@...gle.com>
Cc:     linux-bluetooth <linux-bluetooth@...r.kernel.org>,
        CrosBT Upstreaming <chromeos-bluetooth-upstreaming@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH v7 0/5] Bluetooth: Add new MGMT interface for advertising
 add

Hi Daniel,

> This patch series defines the new two-call MGMT interface for adding
> new advertising instances. Similarly to the hci advertising commands, a
> mgmt call to set parameters is expected to be first, followed by a mgmt
> call to set advertising data/scan response. The members of the
> parameters request are optional; the caller defines a "params" bitfield
> in the structure that indicates which parameters were intentionally set,
> and others are set to defaults.
> 
> The main feature here is the introduction of min/max parameters and tx
> power that can be requested by the client. Min/max parameters will be
> used both with and without extended advertising support, and tx power
> will be used with extended advertising support. After a call to set
> advertising parameters, the selected transmission power will be
> propagated in the reponse to alert userspace to the actual power used.
> 
> Additionally, to inform userspace of the controller LE Tx power
> capabilities for the client's benefit, this series also changes the
> security info MGMT command to more flexibly contain other capabilities,
> such as LE min and max tx power.
> 
> All changes have been tested on hatch (extended advertising) and kukui
> (no extended advertising) chromebooks with manual testing verifying
> correctness of parameters/data in btmon traces, and our automated test
> suite of 25 single- and multi-advertising usage scenarios.
> 
> A separate patch series will add support in bluetoothd. Thanks in
> advance for your feedback!
> 
> Daniel Winkler
> 
> 
> Changes in v7:
> - Rebase onto bluetooth-next/master
> 
> Changes in v6:
> - Only populate LE tx power range if controller reports it
> 
> Changes in v5:
> - Ensure data/scan rsp length is returned for non-ext adv
> 
> Changes in v4:
> - Add remaining data and scan response length to MGMT params response
> - Moving optional params into 'flags' field of MGMT command
> - Combine LE tx range into a single EIR field for MGMT capabilities cmd
> 
> Changes in v3:
> - Adding selected tx power to adv params mgmt response, removing event
> - Re-using security info MGMT command to carry controller capabilities
> 
> Changes in v2:
> - Fixed sparse error in Capabilities MGMT command
> 
> Daniel Winkler (5):
>  Bluetooth: Add helper to set adv data
>  Bluetooth: Break add adv into two mgmt commands
>  Bluetooth: Use intervals and tx power from mgmt cmds
>  Bluetooth: Query LE tx power on startup
>  Bluetooth: Change MGMT security info CMD to be more generic
> 
> include/net/bluetooth/hci.h      |   7 +
> include/net/bluetooth/hci_core.h |  12 +-
> include/net/bluetooth/mgmt.h     |  49 +++-
> net/bluetooth/hci_core.c         |  47 +++-
> net/bluetooth/hci_event.c        |  19 ++
> net/bluetooth/hci_request.c      |  29 ++-
> net/bluetooth/mgmt.c             | 430 +++++++++++++++++++++++++++++--
> 7 files changed, 548 insertions(+), 45 deletions(-)

all 5 patches have been applied to bluetooth-next tree.

Regards

Marcel