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From:   Alain Michaud <alainmichaud@google.com>
Date:   Mon, 6 Jul 2020 22:20:41 -0400
Message-ID: <CALWDO_UXbOn9WNcR6nU-haFd2uKxeJFg0WFezchOxO7GcajCtg@mail.gmail.com>
Subject: Re: [PATCH v3] Bluetooth: le_simult_central_peripheral experimental feature
To:     Alain Michaud <alainm@chromium.org>
Cc:     BlueZ <linux-bluetooth@vger.kernel.org>
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Here is the userspace change associated with this change:
https://patchwork.kernel.org/project/bluetooth/list/?series=313771

On Mon, Jul 6, 2020 at 11:44 AM Alain Michaud <alainm@chromium.org> wrote:
>
> This patch adds an le_simult_central_peripheral features which allows a
> clients to determine if the controller is able to support peripheral and
> central connections separately and at the same time.
>
> Signed-off-by: Alain Michaud <alainm@chromium.org>
> ---
>
> Changes in v3:
>  - Back to the original design of V1 and integrated Marcel's feedback.
>
> Changes in v2:
>  - Slight change of design based on offline feedback
>
>  net/bluetooth/mgmt.c | 24 ++++++++++++++++++++++--
>  1 file changed, 22 insertions(+), 2 deletions(-)
>
> diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
> index 5e9b9728eeac..b34e6f3c07ec 100644
> --- a/net/bluetooth/mgmt.c
> +++ b/net/bluetooth/mgmt.c
> @@ -3753,12 +3753,19 @@ static const u8 debug_uuid[16] = {
>  };
>  #endif
>
> +/* 671b10b5-42c0-4696-9227-eb28d1b049d6 */
> +static const u8 le_simult_central_peripheral[16] = {
> +       0xd6, 0x49, 0xb0, 0xd1, 0x28, 0xeb, 0x27, 0x92,
> +       0x96, 0x46, 0xc0, 0x42, 0xb5, 0x10, 0x1b, 0x67,
> +};
> +
>  static int read_exp_features_info(struct sock *sk, struct hci_dev *hdev,
>                                   void *data, u16 data_len)
>  {
> -       char buf[42];
> +       char buf[44];
>         struct mgmt_rp_read_exp_features_info *rp = (void *)buf;
>         u16 idx = 0;
> +       u32 flags;
>
>         bt_dev_dbg(hdev, "sock %p", sk);
>
> @@ -3766,7 +3773,7 @@ static int read_exp_features_info(struct sock *sk, struct hci_dev *hdev,
>
>  #ifdef CONFIG_BT_FEATURE_DEBUG
>         if (!hdev) {
> -               u32 flags = bt_dbg_get() ? BIT(0) : 0;
> +               flags = bt_dbg_get() ? BIT(0) : 0;
>
>                 memcpy(rp->features[idx].uuid, debug_uuid, 16);
>                 rp->features[idx].flags = cpu_to_le32(flags);
> @@ -3774,6 +3781,19 @@ static int read_exp_features_info(struct sock *sk, struct hci_dev *hdev,
>         }
>  #endif
>
> +       flags = 0;
> +       memcpy(rp->features[idx].uuid, le_simult_central_peripheral,
> +              sizeof(le_simult_central_peripheral));
> +
> +       if (hdev && test_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks) &&
> +           (hdev->le_states[4] & 0x08) &&      /* Central */
> +           (hdev->le_states[4] & 0x40) &&      /* Peripheral */
> +           (hdev->le_states[3] & 0x10)         /* Simultaneous */)
> +               flags |= BIT(0);
> +
> +       rp->features[idx].flags = cpu_to_le32(flags);
> +       idx++;
> +
>         rp->feature_count = cpu_to_le16(idx);
>
>         /* After reading the experimental features information, enable
> --
> 2.27.0.212.ge8ba1cc988-goog
>