netdev - [PATCH v4 5/5] Bluetooth: SCO: add TX timestamping socket-level mechanism

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Message-ID: <79a6ebae9e43c390a9d06278a38f00c8d3af81b6.1739988644.git.pav@iki.fi>
Date: Wed, 19 Feb 2025 20:13:37 +0200
From: Pauli Virtanen <pav@....fi>
To: linux-bluetooth@...r.kernel.org
Cc: Pauli Virtanen <pav@....fi>,
	Luiz Augusto von Dentz <luiz.dentz@...il.com>,
	netdev@...r.kernel.org,
	davem@...emloft.net,
	kuba@...nel.org,
	willemdebruijn.kernel@...il.com
Subject: [PATCH v4 5/5] Bluetooth: SCO: add TX timestamping socket-level mechanism

Support TX timestamping in SCO sockets.

Support MSG_ERRQUEUE in SCO recvmsg.

Signed-off-by: Pauli Virtanen <pav@....fi>
---

Notes:
    v4: no changes

 net/bluetooth/sco.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index aa7bfe26cb40..f39c57ac594f 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -370,7 +370,8 @@ static int sco_connect(struct sock *sk)
 	return err;
 }
 
-static int sco_send_frame(struct sock *sk, struct sk_buff *skb)
+static int sco_send_frame(struct sock *sk, struct sk_buff *skb,
+			  const struct sockcm_cookie *sockc)
 {
 	struct sco_conn *conn = sco_pi(sk)->conn;
 	int len = skb->len;
@@ -381,6 +382,7 @@ static int sco_send_frame(struct sock *sk, struct sk_buff *skb)
 
 	BT_DBG("sk %p len %d", sk, len);
 
+	hci_setup_tx_timestamp(skb, 1, sockc);
 	hci_send_sco(conn->hcon, skb);
 
 	return len;
@@ -776,6 +778,7 @@ static int sco_sock_sendmsg(struct socket *sock, struct msghdr *msg,
 {
 	struct sock *sk = sock->sk;
 	struct sk_buff *skb;
+	struct sockcm_cookie sockc;
 	int err;
 
 	BT_DBG("sock %p, sk %p", sock, sk);
@@ -787,6 +790,14 @@ static int sco_sock_sendmsg(struct socket *sock, struct msghdr *msg,
 	if (msg->msg_flags & MSG_OOB)
 		return -EOPNOTSUPP;
 
+	sockcm_init(&sockc, sk);
+
+	if (msg->msg_controllen) {
+		err = sock_cmsg_send(sk, msg, &sockc);
+		if (err)
+			return err;
+	}
+
 	skb = bt_skb_sendmsg(sk, msg, len, len, 0, 0);
 	if (IS_ERR(skb))
 		return PTR_ERR(skb);
@@ -794,7 +805,7 @@ static int sco_sock_sendmsg(struct socket *sock, struct msghdr *msg,
 	lock_sock(sk);
 
 	if (sk->sk_state == BT_CONNECTED)
-		err = sco_send_frame(sk, skb);
+		err = sco_send_frame(sk, skb, &sockc);
 	else
 		err = -ENOTCONN;
 
@@ -860,6 +871,10 @@ static int sco_sock_recvmsg(struct socket *sock, struct msghdr *msg,
 	struct sock *sk = sock->sk;
 	struct sco_pinfo *pi = sco_pi(sk);
 
+	if (unlikely(flags & MSG_ERRQUEUE))
+		return sock_recv_errqueue(sk, msg, len, SOL_BLUETOOTH,
+					  BT_SCM_ERROR);
+
 	lock_sock(sk);
 
 	if (sk->sk_state == BT_CONNECT2 &&
-- 
2.48.1