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igc: Enable PCIe PTM

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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>
Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Vinicius Costa Gomes 2021-07-26 20:36:56 -07:00 committed by Tony Nguyen
parent 014408cd62
commit 1b5d73fb86
1 changed files with 6 additions and 0 deletions
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6
drivers/net/ethernet/intel/igc/igc_main.c
View file

@ -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"
@ -6174,6 +6176,10 @@ 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;