netdev - [PATCH V4 net-next 1/6] net: Introduce peer to peer one step PTP time stamping.

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Message-Id: <0c508bcc9552a078451dbe3dd66580cc353b6fec.1559109077.git.richardcochran@gmail.com>
Date:   Tue, 28 May 2019 22:58:02 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     netdev@...r.kernel.org
Cc:     David Miller <davem@...emloft.net>, devicetree@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        Miroslav Lichvar <mlichvar@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH V4 net-next 1/6] net: Introduce peer to peer one step PTP time stamping.

The 1588 standard defines one step operation for both Sync and
PDelay_Resp messages.  Up until now, hardware with P2P one step has
been rare, and kernel support was lacking.  This patch adds support of
the mode in anticipation of new hardware developments.

Signed-off-by: Richard Cochran <richardcochran@...il.com>
---
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c | 1 +
 include/uapi/linux/net_tstamp.h                  | 8 ++++++++
 net/core/dev_ioctl.c                             | 1 +
 3 files changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index 03ac10b1cd1e..44a378f26bbd 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -15380,6 +15380,7 @@ int bnx2x_configure_ptp_filters(struct bnx2x *bp)
 		REG_WR(bp, rule, BNX2X_PTP_TX_ON_RULE_MASK);
 		break;
 	case HWTSTAMP_TX_ONESTEP_SYNC:
+	case HWTSTAMP_TX_ONESTEP_P2P:
 		BNX2X_ERR("One-step timestamping is not supported\n");
 		return -ERANGE;
 	}
diff --git a/include/uapi/linux/net_tstamp.h b/include/uapi/linux/net_tstamp.h
index e5b39721c6e4..f96e650d0af9 100644
--- a/include/uapi/linux/net_tstamp.h
+++ b/include/uapi/linux/net_tstamp.h
@@ -90,6 +90,14 @@ enum hwtstamp_tx_types {
 	 * queue.
 	 */
 	HWTSTAMP_TX_ONESTEP_SYNC,
+
+	/*
+	 * Same as HWTSTAMP_TX_ONESTEP_SYNC, but also enables time
+	 * stamp insertion directly into PDelay_Resp packets. In this
+	 * case, neither transmitted Sync nor PDelay_Resp packets will
+	 * receive a time stamp via the socket error queue.
+	 */
+	HWTSTAMP_TX_ONESTEP_P2P,
 };
 
 /* possible values for hwtstamp_config->rx_filter */
diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
index 5163d900bb4f..dbaebbe573f0 100644
--- a/net/core/dev_ioctl.c
+++ b/net/core/dev_ioctl.c
@@ -187,6 +187,7 @@ static int net_hwtstamp_validate(struct ifreq *ifr)
 	case HWTSTAMP_TX_OFF:
 	case HWTSTAMP_TX_ON:
 	case HWTSTAMP_TX_ONESTEP_SYNC:
+	case HWTSTAMP_TX_ONESTEP_P2P:
 		tx_type_valid = 1;
 		break;
 	}
-- 
2.11.0