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Code

Bluetooth: ISO: add socket option to report packet seqnum via CMSG

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User applications need a way to track which ISO interval a given SDU
belongs to, to properly detect packet loss. All controllers do not set
timestamps, and it's not guaranteed user application receives all packet
reports (small socket buffer, or controller doesn't send all reports
like Intel AX210 is doing).

Add socket option BT_PKT_SEQNUM that enables reporting of received
packet ISO sequence number in BT_SCM_PKT_SEQNUM CMSG.

Use BT_PKT_SEQNUM == 22 for the socket option, as 21 was used earlier
for a removed experimental feature that never got into mainline.

Signed-off-by: Pauli Virtanen <pav@iki.fi>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Pauli Virtanen 2025-07-14 19:40:37 +03:00 committed by Luiz Augusto von Dentz
parent 15843c7fdb
commit 7565bc5659
3 changed files with 35 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/net/bluetooth/bluetooth.h
View File

@ -244,6 +244,12 @@ struct bt_codecs {
#define BT_ISO_BASE 20
/* Socket option value 21 reserved */
#define BT_PKT_SEQNUM 22
#define BT_SCM_PKT_SEQNUM 0x05
__printf(1, 2)
void bt_info(const char *fmt, ...);
__printf(1, 2)
@ -391,7 +397,8 @@ struct bt_sock {
enum {
BT_SK_DEFER_SETUP,
BT_SK_SUSPEND,
BT_SK_PKT_STATUS
BT_SK_PKT_STATUS,
BT_SK_PKT_SEQNUM,
};
struct bt_sock_list {
@ -475,6 +482,7 @@ struct bt_skb_cb {
u8 pkt_type;
u8 force_active;
u16 expect;
u16 pkt_seqnum;
u8 incoming:1;
u8 pkt_status:2;
union {
@ -488,6 +496,7 @@ struct bt_skb_cb {
#define hci_skb_pkt_type(skb) bt_cb((skb))->pkt_type
#define hci_skb_pkt_status(skb) bt_cb((skb))->pkt_status
#define hci_skb_pkt_seqnum(skb) bt_cb((skb))->pkt_seqnum
#define hci_skb_expect(skb) bt_cb((skb))->expect
#define hci_skb_opcode(skb) bt_cb((skb))->hci.opcode
#define hci_skb_event(skb) bt_cb((skb))->hci.req_event

7
net/bluetooth/af_bluetooth.c
View File

@ -364,6 +364,13 @@ int bt_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
put_cmsg(msg, SOL_BLUETOOTH, BT_SCM_PKT_STATUS,
sizeof(pkt_status), &pkt_status);
}
if (test_bit(BT_SK_PKT_SEQNUM, &bt_sk(sk)->flags)) {
u16 pkt_seqnum = hci_skb_pkt_seqnum(skb);
put_cmsg(msg, SOL_BLUETOOTH, BT_SCM_PKT_SEQNUM,
sizeof(pkt_seqnum), &pkt_seqnum);
}
}
skb_free_datagram(sk, skb);

21
net/bluetooth/iso.c
View File

@ -1687,6 +1687,17 @@ static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
clear_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
break;
case BT_PKT_SEQNUM:
err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
if (err)
break;
if (opt)
set_bit(BT_SK_PKT_SEQNUM, &bt_sk(sk)->flags);
else
clear_bit(BT_SK_PKT_SEQNUM, &bt_sk(sk)->flags);
break;
case BT_ISO_QOS:
if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
sk->sk_state != BT_CONNECT2 &&
@ -2278,7 +2289,7 @@ 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;
__u16 pb, ts, len;
__u16 pb, ts, len, sn;
if (!conn)
goto drop;
@ -2308,6 +2319,7 @@ void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
goto drop;
}
sn = __le16_to_cpu(hdr->sn);
len = __le16_to_cpu(hdr->slen);
} else {
struct hci_iso_data_hdr *hdr;
@ -2318,18 +2330,20 @@ void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
goto drop;
}
sn = __le16_to_cpu(hdr->sn);
len = __le16_to_cpu(hdr->slen);
}
flags = hci_iso_data_flags(len);
len = hci_iso_data_len(len);
BT_DBG("Start: total len %d, frag len %d flags 0x%4.4x", len,
skb->len, flags);
BT_DBG("Start: total len %d, frag len %d flags 0x%4.4x sn %d",
len, skb->len, flags, sn);
if (len == skb->len) {
/* Complete frame received */
hci_skb_pkt_status(skb) = flags & 0x03;
hci_skb_pkt_seqnum(skb) = sn;
iso_recv_frame(conn, skb);
return;
}
@ -2352,6 +2366,7 @@ void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
goto drop;
hci_skb_pkt_status(conn->rx_skb) = flags & 0x03;
hci_skb_pkt_seqnum(conn->rx_skb) = sn;
skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
skb->len);
conn->rx_len = len - skb->len;