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Message-ID: <CABBYNZ+StxjHC4f_JmPdJg2iv+o+ngyEuSvsBZB7Rrr=9juouQ@mail.gmail.com>
Date: Tue, 29 Apr 2025 10:31:25 -0400
From: Luiz Augusto von Dentz <luiz.dentz@...il.com>
To: Pauli Virtanen <pav@....fi>
Cc: yang.li@...ogic.com, linux-bluetooth@...r.kernel.org,
netdev@...r.kernel.org
Subject: Re: [PATCH] iso: add BT_ISO_TS optional to enable ISO timestamp
Hi Pauli,
On Tue, Apr 29, 2025 at 10:29 AM Pauli Virtanen <pav@....fi> wrote:
>
> ti, 2025-04-29 kello 17:26 +0300, Pauli Virtanen kirjoitti:
> > Hi,
> >
> > ti, 2025-04-29 kello 11:35 +0800, Yang Li via B4 Relay kirjoitti:
> > > From: Yang Li <yang.li@...ogic.com>
> > >
> > > Application layer programs (like pipewire) need to use
> > > iso timestamp information for audio synchronization.
> >
> > I think the timestamp should be put into CMSG, same ways as packet
> > status is. The packet body should then always contain only the payload.
>
> Or, this maybe should instead use the SOF_TIMESTAMPING_RX_HARDWARE
> mechanism, which would avoid adding a new API.
Either that or we use BT_PKT_STATUS, does SOF_TIMESTAMPING_RX_HARDWARE
requires the use of errqueue?
> > >
> > > Signed-off-by: Yang Li <yang.li@...ogic.com>
> > > ---
> > > include/net/bluetooth/bluetooth.h | 4 ++-
> > > net/bluetooth/iso.c | 58 +++++++++++++++++++++++++++++++++------
> > > 2 files changed, 52 insertions(+), 10 deletions(-)
> > >
> > > diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
> > > index bbefde319f95..a102bd76647c 100644
> > > --- a/include/net/bluetooth/bluetooth.h
> > > +++ b/include/net/bluetooth/bluetooth.h
> > > @@ -242,6 +242,7 @@ struct bt_codecs {
> > > #define BT_CODEC_MSBC 0x05
> > >
> > > #define BT_ISO_BASE 20
> > > +#define BT_ISO_TS 21
> > >
> > > __printf(1, 2)
> > > void bt_info(const char *fmt, ...);
> > > @@ -390,7 +391,8 @@ struct bt_sock {
> > > enum {
> > > BT_SK_DEFER_SETUP,
> > > BT_SK_SUSPEND,
> > > - BT_SK_PKT_STATUS
> > > + BT_SK_PKT_STATUS,
> > > + BT_SK_ISO_TS
> > > };
> > >
> > > struct bt_sock_list {
> > > diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c
> > > index 2f348f48e99d..2c1fdea4b8c1 100644
> > > --- a/net/bluetooth/iso.c
> > > +++ b/net/bluetooth/iso.c
> > > @@ -1718,7 +1718,21 @@ static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
> > > iso_pi(sk)->base_len = optlen;
> > >
> > > break;
> > > + case BT_ISO_TS:
> > > + if (optlen != sizeof(opt)) {
> > > + err = -EINVAL;
> > > + break;
> > > + }
> > >
> > > + err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
> > > + if (err)
> > > + break;
> > > +
> > > + if (opt)
> > > + set_bit(BT_SK_ISO_TS, &bt_sk(sk)->flags);
> > > + else
> > > + clear_bit(BT_SK_ISO_TS, &bt_sk(sk)->flags);
> > > + break;
> > > default:
> > > err = -ENOPROTOOPT;
> > > break;
> > > @@ -1789,7 +1803,16 @@ static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
> > > err = -EFAULT;
> > >
> > > break;
> > > + case BT_ISO_TS:
> > > + if (len < sizeof(u32)) {
> > > + err = -EINVAL;
> > > + break;
> > > + }
> > >
> > > + if (put_user(test_bit(BT_SK_ISO_TS, &bt_sk(sk)->flags),
> > > + (u32 __user *)optval))
> > > + err = -EFAULT;
> > > + break;
> > > default:
> > > err = -ENOPROTOOPT;
> > > break;
> > > @@ -2271,13 +2294,21 @@ static void iso_disconn_cfm(struct hci_conn *hcon, __u8 reason)
> > > void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
> > > {
> > > struct iso_conn *conn = hcon->iso_data;
> > > + struct sock *sk;
> > > __u16 pb, ts, len;
> > >
> > > if (!conn)
> > > goto drop;
> > >
> > > - pb = hci_iso_flags_pb(flags);
> > > - ts = hci_iso_flags_ts(flags);
> > > + iso_conn_lock(conn);
> > > + sk = conn->sk;
> > > + iso_conn_unlock(conn);
> > > +
> > > + if (!sk)
> > > + goto drop;
> > > +
> > > + pb = hci_iso_flags_pb(flags);
> > > + ts = hci_iso_flags_ts(flags);
> > >
> > > BT_DBG("conn %p len %d pb 0x%x ts 0x%x", conn, skb->len, pb, ts);
> > >
> > > @@ -2294,17 +2325,26 @@ void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
> > > if (ts) {
> > > struct hci_iso_ts_data_hdr *hdr;
> > >
> > > - /* TODO: add timestamp to the packet? */
> > > - hdr = skb_pull_data(skb, HCI_ISO_TS_DATA_HDR_SIZE);
> > > - if (!hdr) {
> > > - BT_ERR("Frame is too short (len %d)", skb->len);
> > > - goto drop;
> > > - }
> > > + if (test_bit(BT_SK_ISO_TS, &bt_sk(sk)->flags)) {
> > > + hdr = (struct hci_iso_ts_data_hdr *)skb->data;
> > > + len = hdr->slen + HCI_ISO_TS_DATA_HDR_SIZE;
> > > + } else {
> > > + hdr = skb_pull_data(skb, HCI_ISO_TS_DATA_HDR_SIZE);
> > > + if (!hdr) {
> > > + BT_ERR("Frame is too short (len %d)", skb->len);
> > > + goto drop;
> > > + }
> > >
> > > - len = __le16_to_cpu(hdr->slen);
> > > + len = __le16_to_cpu(hdr->slen);
> > > + }
> > > } else {
> > > struct hci_iso_data_hdr *hdr;
> > >
> > > + if (test_bit(BT_SK_ISO_TS, &bt_sk(sk)->flags)) {
> > > + BT_ERR("Invalid option BT_SK_ISO_TS");
> > > + clear_bit(BT_SK_ISO_TS, &bt_sk(sk)->flags);
> > > + }
> > > +
> > > hdr = skb_pull_data(skb, HCI_ISO_DATA_HDR_SIZE);
> > > if (!hdr) {
> > > BT_ERR("Frame is too short (len %d)", skb->len);
> > >
> > > ---
> > > base-commit: 16b4f97defefd93cfaea017a7c3e8849322f7dde
> > > change-id: 20250421-iso_ts-c82a300ae784
> > >
> > > Best regards,
--
Luiz Augusto von Dentz
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