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

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Date:   Thu, 13 Aug 2020 16:41:29 +0800
From:   Joseph Hwang <josephsih@...omium.org>
To:     linux-bluetooth@...r.kernel.org, marcel@...tmann.org,
        luiz.dentz@...il.com
Cc:     josephsih@...gle.com, chromeos-bluetooth-upstreaming@...omium.org,
        Joseph Hwang <josephsih@...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@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH v1 2/2] Bluetooth: sco: expose WBS packet length in socket option

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