netdev - [PATCH net-next 2/3] net: axienet: Support software transmit time stamping.

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Message-Id: <79b2d20c323484b8f86690ea56dae52b1be6a8e9.1576520432.git.richardcochran@gmail.com>
Date:   Mon, 16 Dec 2019 10:32:55 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     netdev@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org,
        David Miller <davem@...emloft.net>,
        Michal Simek <michal.simek@...inx.com>,
        Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
Subject: [PATCH net-next 2/3] net: axienet: Support software transmit time stamping.

MAC drivers are expected to invoke the transmit time stamping hook in
order to support both software time stamping and PHY time stamping.
This patch adds the missing hook.  In addition, drivers calling
netif_rx() should first check for PHY time stamping by calling
skb_defer_rx_timestamp().

Signed-off-by: Richard Cochran <richardcochran@...il.com>
---
 drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 53644abe52da..05fa7371c39a 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -675,6 +675,9 @@ axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 	cur_p->skb = skb;
 
 	tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
+
+	skb_tx_timestamp(skb);
+
 	/* Start the transfer */
 	axienet_dma_out32(lp, XAXIDMA_TX_TDESC_OFFSET, tail_p);
 	if (++lp->tx_bd_tail >= lp->tx_bd_num)
@@ -736,7 +739,8 @@ static void axienet_recv(struct net_device *ndev)
 			skb->ip_summed = CHECKSUM_COMPLETE;
 		}
 
-		netif_rx(skb);
+		if (!skb_defer_rx_timestamp(skb))
+			netif_rx(skb);
 
 		size += length;
 		packets++;
@@ -1367,6 +1371,7 @@ static const struct ethtool_ops axienet_ethtool_ops = {
 	.set_pauseparam = axienet_ethtools_set_pauseparam,
 	.get_coalesce   = axienet_ethtools_get_coalesce,
 	.set_coalesce   = axienet_ethtools_set_coalesce,
+	.get_ts_info	= ethtool_op_get_ts_info,
 	.get_link_ksettings = axienet_ethtools_get_link_ksettings,
 	.set_link_ksettings = axienet_ethtools_set_link_ksettings,
 };
-- 
2.20.1