linux-kernel - Re: [PATCH v1 2/2] Bluetooth: sco: expose WBS packet length in socket option

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Date:   Fri, 14 Aug 2020 12:56:05 -0700
From:   Luiz Augusto von Dentz <luiz.dentz@...il.com>
To:     Joseph Hwang <josephsih@...omium.org>
Cc:     "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Joseph Hwang <josephsih@...gle.com>,
        ChromeOS Bluetooth Upstreaming 
        <chromeos-bluetooth-upstreaming@...omium.org>,
        Alain Michaud <alainm@...omium.org>,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>
Subject: Re: [PATCH v1 2/2] Bluetooth: sco: expose WBS packet length in socket option

Hi Joseph,

On Thu, Aug 13, 2020 at 1:42 AM Joseph Hwang <josephsih@...omium.org> wrote:
>
> It is desirable to expose the wideband speech packet length via
> a socket option to the user space so that the user space can set
> the value correctly in configuring the sco connection.
>
> Reviewed-by: Alain Michaud <alainm@...omium.org>
> Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
> Signed-off-by: Joseph Hwang <josephsih@...omium.org>
> ---
>
>  include/net/bluetooth/bluetooth.h | 2 ++
>  net/bluetooth/sco.c               | 8 ++++++++
>  2 files changed, 10 insertions(+)
>
> diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
> index 9125effbf4483d..922cc03143def4 100644
> --- a/include/net/bluetooth/bluetooth.h
> +++ b/include/net/bluetooth/bluetooth.h
> @@ -153,6 +153,8 @@ struct bt_voice {
>
>  #define BT_SCM_PKT_STATUS      0x03
>
> +#define BT_SCO_PKT_LEN         17
> +
>  __printf(1, 2)
>  void bt_info(const char *fmt, ...);
>  __printf(1, 2)
> diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
> index dcf7f96ff417e6..97e4e7c7b8cf62 100644
> --- a/net/bluetooth/sco.c
> +++ b/net/bluetooth/sco.c
> @@ -67,6 +67,7 @@ struct sco_pinfo {
>         __u32           flags;
>         __u16           setting;
>         __u8            cmsg_mask;
> +       __u32           pkt_len;
>         struct sco_conn *conn;
>  };
>
> @@ -267,6 +268,8 @@ static int sco_connect(struct sock *sk)
>                 sco_sock_set_timer(sk, sk->sk_sndtimeo);
>         }
>
> +       sco_pi(sk)->pkt_len = hdev->sco_pkt_len;
> +
>  done:
>         hci_dev_unlock(hdev);
>         hci_dev_put(hdev);
> @@ -1001,6 +1004,11 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
>                         err = -EFAULT;
>                 break;
>
> +       case BT_SCO_PKT_LEN:
> +               if (put_user(sco_pi(sk)->pkt_len, (u32 __user *)optval))
> +                       err = -EFAULT;
> +               break;

Couldn't we expose this via BT_SNDMTU/BT_RCVMTU?

>         default:
>                 err = -ENOPROTOOPT;
>                 break;
> --
> 2.28.0.236.gb10cc79966-goog
>


-- 
Luiz Augusto von Dentz