netdev - [net-next, v3, 0/2] enetc: support PTP Sync packet one-step timestamping

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Date:   Mon, 12 Apr 2021 17:03:25 +0800
From:   Yangbo Lu <yangbo.lu@....com>
To:     netdev@...r.kernel.org
Cc:     Yangbo Lu <yangbo.lu@....com>,
        "David S . Miller" <davem@...emloft.net>,
        Richard Cochran <richardcochran@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Jakub Kicinski <kuba@...nel.org>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Russell King <linux@...linux.org.uk>
Subject: [net-next, v3, 0/2] enetc: support PTP Sync packet one-step timestamping

This patch-set is to add support for PTP Sync packet one-step timestamping.
Since ENETC single-step register has to be configured dynamically per
packet for correctionField offeset and UDP checksum update, current
one-step timestamping packet has to be sent only when the last one
completes transmitting on hardware. So, on the TX, this patch handles
one-step timestamping packet as below:

- Trasmit packet immediately if no other one in transfer, or queue to
  skb queue if there is already one in transfer.
  The test_and_set_bit_lock() is used here to lock and check state.
- Start a work when complete transfer on hardware, to release the bit
  lock and to send one skb in skb queue if has.

Changes for v2:
	- Rebased.
	- Fixed issues from patchwork checks.
	- netif_tx_lock for one-step timestamping packet sending.
Changes for v3:
	- Used system workqueue.
	- Set bit lock when transmitted one-step packet, and scheduled
	  work when completed. The worker cleared the bit lock, and
	  transmitted one skb in skb queue if has, instead of a loop.

Yangbo Lu (2):
  enetc: mark TX timestamp type per skb
  enetc: support PTP Sync packet one-step timestamping

 drivers/net/ethernet/freescale/enetc/enetc.c  | 193 ++++++++++++++++--
 drivers/net/ethernet/freescale/enetc/enetc.h  |  23 ++-
 .../ethernet/freescale/enetc/enetc_ethtool.c  |   3 +-
 .../net/ethernet/freescale/enetc/enetc_hw.h   |   7 +
 4 files changed, 200 insertions(+), 26 deletions(-)


base-commit: 5b489fea977c2b23e26e2f630478da0f4bfdc879
-- 
2.25.1