sfc: add function to determine which TX timestamping method to use

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@solarflare.com>
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/sfc/nic.h b/drivers/net/ethernet/sfc/nic.h
index 54bfbba5ffe6e5a2c56a4d2f9bb232620ac03579..43a3fa1486ec8dcdaa5e68e85af30cf8e6e25334 100644 (file)
--- 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 976d38bf60686a5603bf76a7ac6a2388f7edbe8b..096b2f7a4835ee4a8ce82c756fdba497a0a8d490 100644 (file)
--- 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)                               \