netdev - [PATCH next-queue v5 3/4] igc: Enable PCIe PTM

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Date:   Fri,  4 Jun 2021 17:23:55 -0700
From:   Vinicius Costa Gomes <vinicius.gomes@...el.com>
To:     intel-wired-lan@...ts.osuosl.org
Cc:     Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        sasha.neftin@...el.com, anthony.l.nguyen@...el.com,
        linux-pci@...r.kernel.org, bhelgaas@...gle.com,
        netdev@...r.kernel.org, mlichvar@...hat.com,
        richardcochran@...il.com, hch@...radead.org, helgaas@...nel.org
Subject: [PATCH next-queue v5 3/4] igc: Enable PCIe PTM

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@...el.com>
---
 drivers/net/ethernet/intel/igc/igc_main.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index a05e6d8ec660..f23d0303e53b 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"
@@ -5864,6 +5866,10 @@ static int igc_probe(struct pci_dev *pdev,
 
 	pci_enable_pcie_error_reporting(pdev);
 
+	err = pci_enable_ptm(pdev, NULL);
+	if (err < 0)
+		dev_err(&pdev->dev, "PTM not supported\n");
+
 	pci_set_master(pdev);
 
 	err = -ENOMEM;
-- 
2.31.1