On Wed, Aug 19, 2020 at 11:23 AM Pali Rohár <pali@xxxxxxxxxx> wrote:
>
> On Wednesday 19 August 2020 11:21:00 Luiz Augusto von Dentz wrote:
> > Hi Pali,
> >
> > On Wed, Aug 19, 2020 at 7:37 AM Pali Rohár <pali@xxxxxxxxxx> wrote:
> > >
> > > On Friday 14 August 2020 12:56:05 Luiz Augusto von Dentz wrote:
> > > > Hi Joseph,
> > > >
> > > > On Thu, Aug 13, 2020 at 1:42 AM Joseph Hwang <josephsih@xxxxxxxxxxxx> 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@xxxxxxxxxxxx>
> > > > > Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@xxxxxxxxxxxx>
> > > > > Signed-off-by: Joseph Hwang <josephsih@xxxxxxxxxxxx>
> > > > > ---
> > > > >
> > > > > 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?
> > >
> > > Hello!
> > >
> > > There is already SCO_OPTIONS sock option, uses struct sco_options and
> > > contains 'mtu' member.
> > >
> > > I think that instead of adding new sock option, existing SCO_OPTIONS
> > > option should be used.
> >
> > We are moving away from type specific options to so options like
> > BT_SNDMTU/BT_RCVMTU should be supported in all socket types.
>
> Yes, this make sense.
>
> But I guess that SCO_OPTIONS should be provided for backward
> compatibility as it is already used by lot of userspace applications.
>
> So for me it looks like that BT_SNDMTU/BT_RCVMTU should return same
> value as SCO_OPTIONS.
Yep, luckily we can do this here because SCO MTU is symmetric.
> > >
> > > > > default:
> > > > > err = -ENOPROTOOPT;
> > > > > break;
> > > > > --
> > > > > 2.28.0.236.gb10cc79966-goog
> > > > >
> > > >
> > > >
> > > > --
> > > > Luiz Augusto von Dentz
> >
> >
> >
> > --
> > Luiz Augusto von Dentz
--
Luiz Augusto von Dentz
