diff mbox series

[next-queue,v6,3/4] igc: Enable PCIe PTM

Message ID 20210727033657.39885-4-vinicius.gomes@intel.com
State New
Headers show
Series igc: Add support for PCIe PTM | expand

Commit Message

Vinicius Costa Gomes July 27, 2021, 3:36 a.m. UTC
Enables PCIe PTM (Precision Time Measurement) support in the igc
driver. Notifies the PCI devices that PCIe PTM should be enabled.

PCIe PTM is similar protocol to PTP (Precision Time Protocol) running
in the PCIe fabric, it allows devices to report time measurements from
their internal clocks and the correlation with the PCIe root clock.

The i225 NIC exposes some registers that expose those time
measurements, those registers will be used, in later patches, to
implement the PTP_SYS_OFFSET_PRECISE ioctl().

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
---
 drivers/net/ethernet/intel/igc/igc_main.c | 6 ++++++
 1 file changed, 6 insertions(+)

Comments

Fuxbrumer, Dvora Aug. 4, 2021, 12:57 p.m. UTC | #1
On 7/27/2021 06:36, Vinicius Costa Gomes wrote:
> Enables PCIe PTM (Precision Time Measurement) support in the igc

> driver. Notifies the PCI devices that PCIe PTM should be enabled.

> 

> PCIe PTM is similar protocol to PTP (Precision Time Protocol) running

> in the PCIe fabric, it allows devices to report time measurements from

> their internal clocks and the correlation with the PCIe root clock.

> 

> The i225 NIC exposes some registers that expose those time

> measurements, those registers will be used, in later patches, to

> implement the PTP_SYS_OFFSET_PRECISE ioctl().

> 

> Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>

> ---

>   drivers/net/ethernet/intel/igc/igc_main.c | 6 ++++++

>   1 file changed, 6 insertions(+)

> 

Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com>
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 4dc7c4d70929..0600c11c2d64 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -12,6 +12,8 @@ 
 #include <net/pkt_sched.h>
 #include <linux/bpf_trace.h>
 #include <net/xdp_sock_drv.h>
+#include <linux/pci.h>
+
 #include <net/ipv6.h>
 
 #include "igc.h"
@@ -6183,6 +6185,10 @@  static int igc_probe(struct pci_dev *pdev,
 
 	pci_enable_pcie_error_reporting(pdev);
 
+	err = pci_enable_ptm(pdev, NULL);
+	if (err < 0)
+		dev_info(&pdev->dev, "PCIe PTM not supported by PCIe bus/controller\n");
+
 	pci_set_master(pdev);
 
 	err = -ENOMEM;