Commit acd16380 authored by Harshitha Ramamurthy's avatar Harshitha Ramamurthy Committed by Jakub Kicinski
Browse files

gve: Add initial PTP device support 



If the device supports reading of the nic clock, add support
to initialize and register the PTP clock.

Signed-off-by: default avatarZiwei Xiao <ziweixiao@google.com>
Reviewed-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarHarshitha Ramamurthy <hramamurthy@google.com>
Link: https://patch.msgid.link/20250614000754.164827-4-hramamurthy@google.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent e0c9d568

drivers/net/ethernet/google/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ if NET_VENDOR_GOOGLE 
config GVE

	tristate "Google Virtual NIC (gVNIC) support"

	depends on (PCI_MSI && (X86 || CPU_LITTLE_ENDIAN))

	depends on PTP_1588_CLOCK_OPTIONAL

	select PAGE_POOL

	help

	  This driver supports Google Virtual NIC (gVNIC)"

drivers/net/ethernet/google/gve/Makefile

+3 −1
Original line number Diff line number Diff line 
# Makefile for the Google virtual Ethernet (gve) driver



obj-$(CONFIG_GVE) += gve.o

gve-objs := gve_main.o gve_tx.o gve_tx_dqo.o gve_rx.o gve_rx_dqo.o gve_ethtool.o gve_adminq.o gve_utils.o gve_flow_rule.o \

gve-y := gve_main.o gve_tx.o gve_tx_dqo.o gve_rx.o gve_rx_dqo.o gve_ethtool.o gve_adminq.o gve_utils.o gve_flow_rule.o \

	    gve_buffer_mgmt_dqo.o



gve-$(CONFIG_PTP_1588_CLOCK) += gve_ptp.o

drivers/net/ethernet/google/gve/gve.h

+8 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include <linux/ethtool_netlink.h>

#include <linux/netdevice.h>

#include <linux/pci.h>

#include <linux/ptp_clock_kernel.h>

#include <linux/u64_stats_sync.h>

#include <net/page_pool/helpers.h>

#include <net/xdp.h>
@@ -750,6 +751,12 @@ struct gve_rss_config { 
	u32 *hash_lut;

};



struct gve_ptp {

	struct ptp_clock_info info;

	struct ptp_clock *clock;

	struct gve_priv *priv;

};



struct gve_priv {

	struct net_device *dev;

	struct gve_tx_ring *tx; /* array of tx_cfg.num_queues */
@@ -874,6 +881,7 @@ struct gve_priv { 


	/* True if the device supports reading the nic clock */

	bool nic_timestamp_supported;

	struct gve_ptp *ptp;

};



enum gve_service_task_flags_bit {

drivers/net/ethernet/google/gve/gve_ptp.c

0 → 100644
+59 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: (GPL-2.0 OR MIT)

/* Google virtual Ethernet (gve) driver

 *

 * Copyright (C) 2025 Google LLC

 */



#include "gve.h"



static const struct ptp_clock_info gve_ptp_caps = {

	.owner          = THIS_MODULE,

	.name		= "gve clock",

};



static int __maybe_unused gve_ptp_init(struct gve_priv *priv)

{

	struct gve_ptp *ptp;

	int err;



	if (!priv->nic_timestamp_supported) {

		dev_dbg(&priv->pdev->dev, "Device does not support PTP\n");

		return -EOPNOTSUPP;

	}



	priv->ptp = kzalloc(sizeof(*priv->ptp), GFP_KERNEL);

	if (!priv->ptp)

		return -ENOMEM;



	ptp = priv->ptp;

	ptp->info = gve_ptp_caps;

	ptp->clock = ptp_clock_register(&ptp->info, &priv->pdev->dev);



	if (IS_ERR(ptp->clock)) {

		dev_err(&priv->pdev->dev, "PTP clock registration failed\n");

		err  = PTR_ERR(ptp->clock);

		goto free_ptp;

	}



	ptp->priv = priv;

	return 0;



free_ptp:

	kfree(ptp);

	priv->ptp = NULL;

	return err;

}



static void __maybe_unused gve_ptp_release(struct gve_priv *priv)

{

	struct gve_ptp *ptp = priv->ptp;



	if (!ptp)

		return;



	if (ptp->clock)

		ptp_clock_unregister(ptp->clock);



	kfree(ptp);

	priv->ptp = NULL;

}