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

Message

Yangbo Lu April 12, 2021, 9:03 a.m. UTC

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