linux-kernel - [PATCH v2] Bluetooth: ISO: Support SOCK

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Message-Id: <20250702-iso_ts-v2-1-723d199c8068@amlogic.com>
Date: Wed, 02 Jul 2025 19:35:48 +0800
From: Yang Li via B4 Relay <devnull+yang.li.amlogic.com@...nel.org>
To: Marcel Holtmann <marcel@...tmann.org>, 
 Johan Hedberg <johan.hedberg@...il.com>, 
 Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>
Cc: linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Yang Li <yang.li@...ogic.com>
Subject: [PATCH v2] Bluetooth: ISO: Support SOCK_RCVTSTAMP via CMSG for ISO
 sockets

From: Yang Li <yang.li@...ogic.com>

User-space applications (e.g., PipeWire) depend on
ISO-formatted timestamps for precise audio sync.

Signed-off-by: Yang Li <yang.li@...ogic.com>
---
Changes in v2:
- Support SOCK_RCVTSTAMPNS via CMSG for ISO sockets
- Link to v1: https://lore.kernel.org/r/20250429-iso_ts-v1-1-e586f30de6cb@amlogic.com
---
 net/bluetooth/iso.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c
index fc22782cbeeb..6927c593a1d6 100644
--- a/net/bluetooth/iso.c
+++ b/net/bluetooth/iso.c
@@ -2308,6 +2308,9 @@ void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
 				goto drop;
 			}

+			/* Record the timestamp to skb*/
+			skb->skb_mstamp_ns = le32_to_cpu(hdr->ts);
+
 			len = __le16_to_cpu(hdr->slen);
 		} else {
 			struct hci_iso_data_hdr *hdr;

---
base-commit: 3bc46213b81278f3a9df0324768e152de71eb9fe
change-id: 20250421-iso_ts-c82a300ae784

Best regards,
-- 
Yang Li <yang.li@...ogic.com>