netdev - [PATCH net-next 03/12] sfc: add function to determine which TX timestamping method to use

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Message-ID: <02094aaa-b22b-d47c-57ac-507b36df3705@solarflare.com>
Date:   Thu, 25 Jan 2018 17:24:56 +0000
From:   Edward Cree <ecree@...arflare.com>
To:     <linux-net-drivers@...arflare.com>, <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <levans@...arflare.com>
Subject: [PATCH net-next 03/12] sfc: add function to determine which TX
 timestamping method to use

From: Martin Habets <mhabets@...arflare.com>

Use MC capability MC_CMD_GET_CAPABILITIES_V2_OUT_TX_MAC_TIMESTAMPING to
 detect whether the NIC supports timestamping packets sent out the main
 datapath.

Signed-off-by: Martin Habets <mhabets@...arflare.com>
Signed-off-by: Edward Cree <ecree@...arflare.com>
---
 drivers/net/ethernet/sfc/nic.h |  1 +
 drivers/net/ethernet/sfc/ptp.c | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/net/ethernet/sfc/nic.h b/drivers/net/ethernet/sfc/nic.h
index 54bfbba5ffe6..43a3fa1486ec 100644
--- a/drivers/net/ethernet/sfc/nic.h
+++ b/drivers/net/ethernet/sfc/nic.h
@@ -471,6 +471,7 @@ static inline void efx_rx_skb_attach_timestamp(struct efx_channel *channel,
 }
 void efx_ptp_start_datapath(struct efx_nic *efx);
 void efx_ptp_stop_datapath(struct efx_nic *efx);
+bool efx_ptp_use_mac_tx_timestamps(struct efx_nic *efx);
 ktime_t efx_ptp_nic_to_kernel_time(struct efx_tx_queue *tx_queue);
 
 extern const struct efx_nic_type falcon_a1_nic_type;
diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c
index 976d38bf6068..096b2f7a4835 100644
--- a/drivers/net/ethernet/sfc/ptp.c
+++ b/drivers/net/ethernet/sfc/ptp.c
@@ -329,6 +329,16 @@ static int efx_phc_settime(struct ptp_clock_info *ptp,
 static int efx_phc_enable(struct ptp_clock_info *ptp,
 			  struct ptp_clock_request *request, int on);
 
+bool efx_ptp_use_mac_tx_timestamps(struct efx_nic *efx)
+{
+	struct efx_ef10_nic_data *nic_data = efx->nic_data;
+
+	return ((efx_nic_rev(efx) >= EFX_REV_HUNT_A0) &&
+		(nic_data->datapath_caps2 &
+		 (1 << MC_CMD_GET_CAPABILITIES_V2_OUT_TX_MAC_TIMESTAMPING_LBN)
+		));
+}
+
 #define PTP_SW_STAT(ext_name, field_name)				\
 	{ #ext_name, 0, offsetof(struct efx_ptp_data, field_name) }
 #define PTP_MC_STAT(ext_name, mcdi_name)				\