linux-kernel - Re: [RESEND PATCH] bluetooth: Set ext scan response only when it exists

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Date:   Sun, 13 Sep 2020 09:48:28 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
Cc:     CrosBT Upstreaming <chromeos-bluetooth-upstreaming@...omium.org>,
        linux-bluetooth <linux-bluetooth@...r.kernel.org>,
        Daniel Winkler <danielwinkler@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Johan Hedberg <johan.hedberg@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [RESEND PATCH] bluetooth: Set ext scan response only when it
 exists

Hi Abhishek,

> Only set extended scan response only when it exists. Otherwise, clear
> the scan response data.
> 
> Per the core spec v5.2, Vol 4, Part E, 7.8.55
> 
> If the advertising set is non-scannable and the Host uses this command
> other than to discard existing data, the Controller shall return the
> error code Invalid HCI Command Parameters (0x12).
> 
> On WCN3991, the controller correctly responds with Invalid Parameters
> when this is sent.  That error causes __hci_req_hci_power_on to fail
> with -EINVAL and LE devices can't connect because background scanning
> isn't configured.
> 
> Here is an hci trace of where this issue occurs during power on:
> 
> < HCI Command: LE Set Extended Advertising Parameters (0x08|0x0036) plen 25
>        Handle: 0x00
>        Properties: 0x0010
>          Use legacy advertising PDUs: ADV_NONCONN_IND
>        Min advertising interval: 181.250 msec (0x0122)
>        Max advertising interval: 181.250 msec (0x0122)
>        Channel map: 37, 38, 39 (0x07)
>        Own address type: Random (0x01)
>        Peer address type: Public (0x00)
>        Peer address: 00:00:00:00:00:00 (OUI 00-00-00)
>        Filter policy: Allow Scan Request from Any, Allow Connect...
>        TX power: 127 dbm (0x7f)
>        Primary PHY: LE 1M (0x01)
>        Secondary max skip: 0x00
>        Secondary PHY: LE 1M (0x01)
>        SID: 0x00
>        Scan request notifications: Disabled (0x00)
>> HCI Event: Command Complete (0x0e) plen 5
>      LE Set Extended Advertising Parameters (0x08|0x0036) ncmd 1
>        Status: Success (0x00)
>        TX power (selected): 9 dbm (0x09)
> < HCI Command: LE Set Advertising Set Random Address (0x08|0x0035) plen 7
>        Advertising handle: 0x00
>        Advertising random address: 08:FD:55:ED:22:28 (OUI 08-FD-55)
>> HCI Event: Command Complete (0x0e) plen 4
>      LE Set Advertising Set Random Address (0x08|0x0035) ncmd
>        Status: Success (0x00)
> < HCI Command: LE Set Extended Scan Response Data (0x08|0x0038) plen 35
>        Handle: 0x00
>        Operation: Complete scan response data (0x03)
>        Fragment preference: Minimize fragmentation (0x01)
>        Data length: 0x0d
>        Name (short): Chromebook
>> HCI Event: Command Complete (0x0e) plen 4
>      LE Set Extended Scan Response Data (0x08|0x0038) ncmd 1
>        Status: Invalid HCI Command Parameters (0x12)
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
> Reviewed-by: Daniel Winkler <danielwinkler@...gle.com>
> ---
> 
> net/bluetooth/hci_request.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel