drivers/net/ethernet/qlogic/qede/qede_ptp.c - linux/torvalds/linux - Git at Google

 /* QLogic qede NIC Driver
  * Copyright (c) 2015-2017  QLogic Corporation
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
  * General Public License (GPL) Version 2, available from the file
  * COPYING in the main directory of this source tree, or the
  * OpenIB.org BSD license below:
  *
  *     Redistribution and use in source and binary forms, with or
  *     without modification, are permitted provided that the following
  *     conditions are met:
  *
  *      - Redistributions of source code must retain the above
  *        copyright notice, this list of conditions and the following
  *        disclaimer.
  *
  *      - Redistributions in binary form must reproduce the above
  *        copyright notice, this list of conditions and the following
  *        disclaimer in the documentation and /or other materials
  *        provided with the distribution.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
 #include "qede_ptp.h"
 #define QEDE_PTP_TX_TIMEOUT (2 * HZ)

 struct qede_ptp {
 	const struct qed_eth_ptp_ops	*ops;
 	struct ptp_clock_info		clock_info;
 	struct cyclecounter		cc;
 	struct timecounter		tc;
 	struct ptp_clock		*clock;
 	struct work_struct		work;
 	unsigned long			ptp_tx_start;
 	struct qede_dev			*edev;
 	struct sk_buff			*tx_skb;

 	/* ptp spinlock is used for protecting the cycle/time counter fields
 	 * and, also for serializing the qed PTP API invocations.
 	 */
 	spinlock_t			lock;
 	bool				hw_ts_ioctl_called;
 	u16				tx_type;
 	u16				rx_filter;
 };

 /**
  * qede_ptp_adjfreq
  * @ptp: the ptp clock structure
  * @ppb: parts per billion adjustment from base
  *
  * Adjust the frequency of the ptp cycle counter by the
  * indicated ppb from the base frequency.
  */
 static int qede_ptp_adjfreq(struct ptp_clock_info *info, s32 ppb)
 {
 	struct qede_ptp *ptp = container_of(info, struct qede_ptp, clock_info);
 	struct qede_dev *edev = ptp->edev;
 	int rc;

 	__qede_lock(edev);
 	if (edev->state == QEDE_STATE_OPEN) {
 		spin_lock_bh(&ptp->lock);
 		rc = ptp->ops->adjfreq(edev->cdev, ppb);
 		spin_unlock_bh(&ptp->lock);
 	} else {
 		DP_ERR(edev, "PTP adjfreq called while interface is down\n");
 		rc = -EFAULT;
 	}
 	__qede_unlock(edev);

 	return rc;
 }

 static int qede_ptp_adjtime(struct ptp_clock_info *info, s64 delta)
 {
 	struct qede_dev *edev;
 	struct qede_ptp *ptp;

 	ptp = container_of(info, struct qede_ptp, clock_info);
 	edev = ptp->edev;

 	DP_VERBOSE(edev, QED_MSG_DEBUG, "PTP adjtime called, delta = %llx\n",
 		   delta);

 	spin_lock_bh(&ptp->lock);
 	timecounter_adjtime(&ptp->tc, delta);
 	spin_unlock_bh(&ptp->lock);

 	return 0;
 }

 static int qede_ptp_gettime(struct ptp_clock_info *info, struct timespec64 *ts)
 {
 	struct qede_dev *edev;
 	struct qede_ptp *ptp;
 	u64 ns;

 	ptp = container_of(info, struct qede_ptp, clock_info);
 	edev = ptp->edev;

 	spin_lock_bh(&ptp->lock);
 	ns = timecounter_read(&ptp->tc);
 	spin_unlock_bh(&ptp->lock);

 	DP_VERBOSE(edev, QED_MSG_DEBUG, "PTP gettime called, ns = %llu\n", ns);

 	*ts = ns_to_timespec64(ns);

 	return 0;
 }

 static int qede_ptp_settime(struct ptp_clock_info *info,
 			    const struct timespec64 *ts)
 {
 	struct qede_dev *edev;
 	struct qede_ptp *ptp;
 	u64 ns;

 	ptp = container_of(info, struct qede_ptp, clock_info);
 	edev = ptp->edev;

 	ns = timespec64_to_ns(ts);

 	DP_VERBOSE(edev, QED_MSG_DEBUG, "PTP settime called, ns = %llu\n", ns);

 	/* Re-init the timecounter */
 	spin_lock_bh(&ptp->lock);
 	timecounter_init(&ptp->tc, &ptp->cc, ns);
 	spin_unlock_bh(&ptp->lock);

 	return 0;
 }

 /* Enable (or disable) ancillary features of the phc subsystem */
 static int qede_ptp_ancillary_feature_enable(struct ptp_clock_info *info,
 					     struct ptp_clock_request *rq,
 					     int on)
 {
 	struct qede_dev *edev;
 	struct qede_ptp *ptp;

 	ptp = container_of(info, struct qede_ptp, clock_info);
 	edev = ptp->edev;

 	DP_ERR(edev, "PHC ancillary features are not supported\n");

 	return -ENOTSUPP;
 }

 static void qede_ptp_task(struct work_struct *work)
 {
 	struct skb_shared_hwtstamps shhwtstamps;
 	struct qede_dev *edev;
 	struct qede_ptp *ptp;
 	u64 timestamp, ns;
 	bool timedout;
 	int rc;

 	ptp = container_of(work, struct qede_ptp, work);
 	edev = ptp->edev;
 	timedout = time_is_before_jiffies(ptp->ptp_tx_start +
 					  QEDE_PTP_TX_TIMEOUT);

 	/* Read Tx timestamp registers */
 	spin_lock_bh(&ptp->lock);
 	rc = ptp->ops->read_tx_ts(edev->cdev, &timestamp);
 	spin_unlock_bh(&ptp->lock);
 	if (rc) {
 		if (unlikely(timedout)) {
 			DP_INFO(edev, "Tx timestamp is not recorded\n");
 			dev_kfree_skb_any(ptp->tx_skb);
 			ptp->tx_skb = NULL;
 			clear_bit_unlock(QEDE_FLAGS_PTP_TX_IN_PRORGESS,
 					 &edev->flags);
 			edev->ptp_skip_txts++;
 		} else {
 			/* Reschedule to keep checking for a valid TS value */
 			schedule_work(&ptp->work);
 		}
 		return;
 	}

 	ns = timecounter_cyc2time(&ptp->tc, timestamp);
 	memset(&shhwtstamps, 0, sizeof(shhwtstamps));
 	shhwtstamps.hwtstamp = ns_to_ktime(ns);
 	skb_tstamp_tx(ptp->tx_skb, &shhwtstamps);
 	dev_kfree_skb_any(ptp->tx_skb);
 	ptp->tx_skb = NULL;
 	clear_bit_unlock(QEDE_FLAGS_PTP_TX_IN_PRORGESS, &edev->flags);

 	DP_VERBOSE(edev, QED_MSG_DEBUG,
 		   "Tx timestamp, timestamp cycles = %llu, ns = %llu\n",
 		   timestamp, ns);
 }

 /* Read the PHC. This API is invoked with ptp_lock held. */
 static u64 qede_ptp_read_cc(const struct cyclecounter *cc)
 {
 	struct qede_dev *edev;
 	struct qede_ptp *ptp;
 	u64 phc_cycles;
 	int rc;

 	ptp = container_of(cc, struct qede_ptp, cc);
 	edev = ptp->edev;
 	rc = ptp->ops->read_cc(edev->cdev, &phc_cycles);
 	if (rc)
 		WARN_ONCE(1, "PHC read err %d\n", rc);

 	DP_VERBOSE(edev, QED_MSG_DEBUG, "PHC read cycles = %llu\n", phc_cycles);

 	return phc_cycles;
 }

 static int qede_ptp_cfg_filters(struct qede_dev *edev)
 {
 	enum qed_ptp_hwtstamp_tx_type tx_type = QED_PTP_HWTSTAMP_TX_ON;
 	enum qed_ptp_filter_type rx_filter = QED_PTP_FILTER_NONE;
 	struct qede_ptp *ptp = edev->ptp;

 	if (!ptp)
 		return -EIO;

 	if (!ptp->hw_ts_ioctl_called) {
 		DP_INFO(edev, "TS IOCTL not called\n");
 		return 0;
 	}

 	switch (ptp->tx_type) {
 	case HWTSTAMP_TX_ON:
 		set_bit(QEDE_FLAGS_TX_TIMESTAMPING_EN, &edev->flags);
 		tx_type = QED_PTP_HWTSTAMP_TX_ON;
 		break;

 	case HWTSTAMP_TX_OFF:
 		clear_bit(QEDE_FLAGS_TX_TIMESTAMPING_EN, &edev->flags);
 		tx_type = QED_PTP_HWTSTAMP_TX_OFF;
 		break;

 	case HWTSTAMP_TX_ONESTEP_SYNC:
 	case HWTSTAMP_TX_ONESTEP_P2P:
 		DP_ERR(edev, "One-step timestamping is not supported\n");
 		return -ERANGE;
 	}

 	spin_lock_bh(&ptp->lock);
 	switch (ptp->rx_filter) {
 	case HWTSTAMP_FILTER_NONE:
 		rx_filter = QED_PTP_FILTER_NONE;
 		break;
 	case HWTSTAMP_FILTER_ALL:
 	case HWTSTAMP_FILTER_SOME:
 	case HWTSTAMP_FILTER_NTP_ALL:
 		ptp->rx_filter = HWTSTAMP_FILTER_NONE;
 		rx_filter = QED_PTP_FILTER_ALL;
 		break;
 	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
 		ptp->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
 		rx_filter = QED_PTP_FILTER_V1_L4_EVENT;
 		break;
 	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
 	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
 		ptp->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
 		/* Initialize PTP detection for UDP/IPv4 events */
 		rx_filter = QED_PTP_FILTER_V1_L4_GEN;
 		break;
 	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
 		ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
 		rx_filter = QED_PTP_FILTER_V2_L4_EVENT;
 		break;
 	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
 	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
 		ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
 		/* Initialize PTP detection for UDP/IPv4 or UDP/IPv6 events */
 		rx_filter = QED_PTP_FILTER_V2_L4_GEN;
 		break;
 	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
 		ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
 		rx_filter = QED_PTP_FILTER_V2_L2_EVENT;
 		break;
 	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
 	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
 		ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
 		/* Initialize PTP detection L2 events */
 		rx_filter = QED_PTP_FILTER_V2_L2_GEN;
 		break;
 	case HWTSTAMP_FILTER_PTP_V2_EVENT:
 		ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
 		rx_filter = QED_PTP_FILTER_V2_EVENT;
 		break;
 	case HWTSTAMP_FILTER_PTP_V2_SYNC:
 	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
 		ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
 		/* Initialize PTP detection L2, UDP/IPv4 or UDP/IPv6 events */
 		rx_filter = QED_PTP_FILTER_V2_GEN;
 		break;
 	}

 	ptp->ops->cfg_filters(edev->cdev, rx_filter, tx_type);

 	spin_unlock_bh(&ptp->lock);

 	return 0;
 }

 int qede_ptp_hw_ts(struct qede_dev *edev, struct ifreq *ifr)
 {
 	struct hwtstamp_config config;
 	struct qede_ptp *ptp;
 	int rc;

 	ptp = edev->ptp;
 	if (!ptp)
 		return -EIO;

 	if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
 		return -EFAULT;

 	DP_VERBOSE(edev, QED_MSG_DEBUG,
 		   "HWTSTAMP IOCTL: Requested tx_type = %d, requested rx_filters = %d\n",
 		   config.tx_type, config.rx_filter);

 	if (config.flags) {
 		DP_ERR(edev, "config.flags is reserved for future use\n");
 		return -EINVAL;
 	}

 	ptp->hw_ts_ioctl_called = 1;
 	ptp->tx_type = config.tx_type;
 	ptp->rx_filter = config.rx_filter;

 	rc = qede_ptp_cfg_filters(edev);
 	if (rc)
 		return rc;

 	config.rx_filter = ptp->rx_filter;

 	return copy_to_user(ifr->ifr_data, &config,
 			    sizeof(config)) ? -EFAULT : 0;
 }

 int qede_ptp_get_ts_info(struct qede_dev *edev, struct ethtool_ts_info *info)
 {
 	struct qede_ptp *ptp = edev->ptp;

 	if (!ptp) {
 		info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
 					SOF_TIMESTAMPING_RX_SOFTWARE |
 					SOF_TIMESTAMPING_SOFTWARE;
 		info->phc_index = -1;

 		return 0;
 	}

 	info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
 				SOF_TIMESTAMPING_RX_SOFTWARE |
 				SOF_TIMESTAMPING_SOFTWARE |
 				SOF_TIMESTAMPING_TX_HARDWARE |
 				SOF_TIMESTAMPING_RX_HARDWARE |
 				SOF_TIMESTAMPING_RAW_HARDWARE;

 	if (ptp->clock)
 		info->phc_index = ptp_clock_index(ptp->clock);
 	else
 		info->phc_index = -1;

 	info->rx_filters = BIT(HWTSTAMP_FILTER_NONE) |
 			   BIT(HWTSTAMP_FILTER_PTP_V1_L4_EVENT) |
 			   BIT(HWTSTAMP_FILTER_PTP_V1_L4_SYNC) |
 			   BIT(HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ) |
 			   BIT(HWTSTAMP_FILTER_PTP_V2_L4_EVENT) |
 			   BIT(HWTSTAMP_FILTER_PTP_V2_L4_SYNC) |
 			   BIT(HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ) |
 			   BIT(HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
 			   BIT(HWTSTAMP_FILTER_PTP_V2_L2_SYNC) |
 			   BIT(HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ) |
 			   BIT(HWTSTAMP_FILTER_PTP_V2_EVENT) |
 			   BIT(HWTSTAMP_FILTER_PTP_V2_SYNC) |
 			   BIT(HWTSTAMP_FILTER_PTP_V2_DELAY_REQ);

 	info->tx_types = BIT(HWTSTAMP_TX_OFF) | BIT(HWTSTAMP_TX_ON);

 	return 0;
 }

 void qede_ptp_disable(struct qede_dev *edev)
 {
 	struct qede_ptp *ptp;

 	ptp = edev->ptp;
 	if (!ptp)
 		return;

 	if (ptp->clock) {
 		ptp_clock_unregister(ptp->clock);
 		ptp->clock = NULL;
 	}

 	/* Cancel PTP work queue. Should be done after the Tx queues are
 	 * drained to prevent additional scheduling.
 	 */
 	cancel_work_sync(&ptp->work);
 	if (ptp->tx_skb) {
 		dev_kfree_skb_any(ptp->tx_skb);
 		ptp->tx_skb = NULL;
 	}

 	/* Disable PTP in HW */
 	spin_lock_bh(&ptp->lock);
 	ptp->ops->disable(edev->cdev);
 	spin_unlock_bh(&ptp->lock);

 	kfree(ptp);
 	edev->ptp = NULL;
 }

 static int qede_ptp_init(struct qede_dev *edev, bool init_tc)
 {
 	struct qede_ptp *ptp;
 	int rc;

 	ptp = edev->ptp;
 	if (!ptp)
 		return -EINVAL;

 	spin_lock_init(&ptp->lock);

 	/* Configure PTP in HW */
 	rc = ptp->ops->enable(edev->cdev);
 	if (rc) {
 		DP_INFO(edev, "PTP HW enable failed\n");
 		return rc;
 	}

 	/* Init work queue for Tx timestamping */
 	INIT_WORK(&ptp->work, qede_ptp_task);

 	/* Init cyclecounter and timecounter. This is done only in the first
 	 * load. If done in every load, PTP application will fail when doing
 	 * unload / load (e.g. MTU change) while it is running.
 	 */
 	if (init_tc) {
 		memset(&ptp->cc, 0, sizeof(ptp->cc));
 		ptp->cc.read = qede_ptp_read_cc;
 		ptp->cc.mask = CYCLECOUNTER_MASK(64);
 		ptp->cc.shift = 0;
 		ptp->cc.mult = 1;

 		timecounter_init(&ptp->tc, &ptp->cc,
 				 ktime_to_ns(ktime_get_real()));
 	}

 	return rc;
 }

 int qede_ptp_enable(struct qede_dev *edev, bool init_tc)
 {
 	struct qede_ptp *ptp;
 	int rc;

 	ptp = kzalloc(sizeof(*ptp), GFP_KERNEL);
 	if (!ptp) {
 		DP_INFO(edev, "Failed to allocate struct for PTP\n");
 		return -ENOMEM;
 	}

 	ptp->edev = edev;
 	ptp->ops = edev->ops->ptp;
 	if (!ptp->ops) {
 		DP_INFO(edev, "PTP enable failed\n");
 		rc = -EIO;
 		goto err1;
 	}

 	edev->ptp = ptp;

 	rc = qede_ptp_init(edev, init_tc);
 	if (rc)
 		goto err1;

 	qede_ptp_cfg_filters(edev);

 	/* Fill the ptp_clock_info struct and register PTP clock */
 	ptp->clock_info.owner = THIS_MODULE;
 	snprintf(ptp->clock_info.name, 16, "%s", edev->ndev->name);
 	ptp->clock_info.max_adj = QED_MAX_PHC_DRIFT_PPB;
 	ptp->clock_info.n_alarm = 0;
 	ptp->clock_info.n_ext_ts = 0;
 	ptp->clock_info.n_per_out = 0;
 	ptp->clock_info.pps = 0;
 	ptp->clock_info.adjfreq = qede_ptp_adjfreq;
 	ptp->clock_info.adjtime = qede_ptp_adjtime;
 	ptp->clock_info.gettime64 = qede_ptp_gettime;
 	ptp->clock_info.settime64 = qede_ptp_settime;
 	ptp->clock_info.enable = qede_ptp_ancillary_feature_enable;

 	ptp->clock = ptp_clock_register(&ptp->clock_info, &edev->pdev->dev);
 	if (IS_ERR(ptp->clock)) {
 		DP_ERR(edev, "PTP clock registration failed\n");
 		qede_ptp_disable(edev);
 		rc = -EINVAL;
 		goto err2;
 	}

 	return 0;

 err1:
 	kfree(ptp);
 err2:
 	edev->ptp = NULL;

 	return rc;
 }

 void qede_ptp_tx_ts(struct qede_dev *edev, struct sk_buff *skb)
 {
 	struct qede_ptp *ptp;

 	ptp = edev->ptp;
 	if (!ptp)
 		return;

 	if (test_and_set_bit_lock(QEDE_FLAGS_PTP_TX_IN_PRORGESS,
 				  &edev->flags)) {
 		DP_ERR(edev, "Timestamping in progress\n");
 		edev->ptp_skip_txts++;
 		return;
 	}

 	if (unlikely(!test_bit(QEDE_FLAGS_TX_TIMESTAMPING_EN, &edev->flags))) {
 		DP_ERR(edev,
 		       "Tx timestamping was not enabled, this packet will not be timestamped\n");
 		clear_bit_unlock(QEDE_FLAGS_PTP_TX_IN_PRORGESS, &edev->flags);
 		edev->ptp_skip_txts++;
 	} else if (unlikely(ptp->tx_skb)) {
 		DP_ERR(edev,
 		       "The device supports only a single outstanding packet to timestamp, this packet will not be timestamped\n");
 		clear_bit_unlock(QEDE_FLAGS_PTP_TX_IN_PRORGESS, &edev->flags);
 		edev->ptp_skip_txts++;
 	} else {
 		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
 		/* schedule check for Tx timestamp */
 		ptp->tx_skb = skb_get(skb);
 		ptp->ptp_tx_start = jiffies;
 		schedule_work(&ptp->work);
 	}
 }

 void qede_ptp_rx_ts(struct qede_dev *edev, struct sk_buff *skb)
 {
 	struct qede_ptp *ptp;
 	u64 timestamp, ns;
 	int rc;

 	ptp = edev->ptp;
 	if (!ptp)
 		return;

 	spin_lock_bh(&ptp->lock);
 	rc = ptp->ops->read_rx_ts(edev->cdev, &timestamp);
 	if (rc) {
 		spin_unlock_bh(&ptp->lock);
 		DP_INFO(edev, "Invalid Rx timestamp\n");
 		return;
 	}

 	ns = timecounter_cyc2time(&ptp->tc, timestamp);
 	spin_unlock_bh(&ptp->lock);
 	skb_hwtstamps(skb)->hwtstamp = ns_to_ktime(ns);
 	DP_VERBOSE(edev, QED_MSG_DEBUG,
 		   "Rx timestamp, timestamp cycles = %llu, ns = %llu\n",
 		   timestamp, ns);
 }
	/* QLogic qede NIC Driver
	* Copyright (c) 2015-2017 QLogic Corporation
	*
	* This software is available to you under a choice of one of two
	* licenses. You may choose to be licensed under the terms of the GNU
	* General Public License (GPL) Version 2, available from the file
	* COPYING in the main directory of this source tree, or the
	* OpenIB.org BSD license below:
	*
	* Redistribution and use in source and binary forms, with or
	* without modification, are permitted provided that the following
	* conditions are met:
	*
	* - Redistributions of source code must retain the above
	* copyright notice, this list of conditions and the following
	* disclaimer.
	*
	* - Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following
	* disclaimer in the documentation and /or other materials
	* provided with the distribution.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	* SOFTWARE.
	*/
	#include "qede_ptp.h"
	#define QEDE_PTP_TX_TIMEOUT (2 * HZ)

	struct qede_ptp {
	const struct qed_eth_ptp_ops *ops;
	struct ptp_clock_info clock_info;
	struct cyclecounter cc;
	struct timecounter tc;
	struct ptp_clock *clock;
	struct work_struct work;
	unsigned long ptp_tx_start;
	struct qede_dev *edev;
	struct sk_buff *tx_skb;

	/* ptp spinlock is used for protecting the cycle/time counter fields
	* and, also for serializing the qed PTP API invocations.
	*/
	spinlock_t lock;
	bool hw_ts_ioctl_called;
	u16 tx_type;
	u16 rx_filter;
	};

	/**
	* qede_ptp_adjfreq
	* @ptp: the ptp clock structure
	* @ppb: parts per billion adjustment from base
	*
	* Adjust the frequency of the ptp cycle counter by the
	* indicated ppb from the base frequency.
	*/
	static int qede_ptp_adjfreq(struct ptp_clock_info *info, s32 ppb)
	{
	struct qede_ptp *ptp = container_of(info, struct qede_ptp, clock_info);
	struct qede_dev *edev = ptp->edev;
	int rc;

	__qede_lock(edev);
	if (edev->state == QEDE_STATE_OPEN) {
	spin_lock_bh(&ptp->lock);
	rc = ptp->ops->adjfreq(edev->cdev, ppb);
	spin_unlock_bh(&ptp->lock);
	} else {
	DP_ERR(edev, "PTP adjfreq called while interface is down\n");
	rc = -EFAULT;
	}
	__qede_unlock(edev);

	return rc;
	}

	static int qede_ptp_adjtime(struct ptp_clock_info *info, s64 delta)
	{
	struct qede_dev *edev;
	struct qede_ptp *ptp;

	ptp = container_of(info, struct qede_ptp, clock_info);
	edev = ptp->edev;

	DP_VERBOSE(edev, QED_MSG_DEBUG, "PTP adjtime called, delta = %llx\n",
	delta);

	spin_lock_bh(&ptp->lock);
	timecounter_adjtime(&ptp->tc, delta);
	spin_unlock_bh(&ptp->lock);

	return 0;
	}

	static int qede_ptp_gettime(struct ptp_clock_info info, struct timespec64 ts)
	{
	struct qede_dev *edev;
	struct qede_ptp *ptp;
	u64 ns;

	ptp = container_of(info, struct qede_ptp, clock_info);
	edev = ptp->edev;

	spin_lock_bh(&ptp->lock);
	ns = timecounter_read(&ptp->tc);
	spin_unlock_bh(&ptp->lock);

	DP_VERBOSE(edev, QED_MSG_DEBUG, "PTP gettime called, ns = %llu\n", ns);

	*ts = ns_to_timespec64(ns);

	return 0;
	}

	static int qede_ptp_settime(struct ptp_clock_info *info,
	const struct timespec64 *ts)
	{
	struct qede_dev *edev;
	struct qede_ptp *ptp;
	u64 ns;

	ptp = container_of(info, struct qede_ptp, clock_info);
	edev = ptp->edev;

	ns = timespec64_to_ns(ts);

	DP_VERBOSE(edev, QED_MSG_DEBUG, "PTP settime called, ns = %llu\n", ns);

	/* Re-init the timecounter */
	spin_lock_bh(&ptp->lock);
	timecounter_init(&ptp->tc, &ptp->cc, ns);
	spin_unlock_bh(&ptp->lock);

	return 0;
	}

	/* Enable (or disable) ancillary features of the phc subsystem */
	static int qede_ptp_ancillary_feature_enable(struct ptp_clock_info *info,
	struct ptp_clock_request *rq,
	int on)
	{
	struct qede_dev *edev;
	struct qede_ptp *ptp;

	ptp = container_of(info, struct qede_ptp, clock_info);
	edev = ptp->edev;

	DP_ERR(edev, "PHC ancillary features are not supported\n");

	return -ENOTSUPP;
	}

	static void qede_ptp_task(struct work_struct *work)
	{
	struct skb_shared_hwtstamps shhwtstamps;
	struct qede_dev *edev;
	struct qede_ptp *ptp;
	u64 timestamp, ns;
	bool timedout;
	int rc;

	ptp = container_of(work, struct qede_ptp, work);
	edev = ptp->edev;
	timedout = time_is_before_jiffies(ptp->ptp_tx_start +
	QEDE_PTP_TX_TIMEOUT);

	/* Read Tx timestamp registers */
	spin_lock_bh(&ptp->lock);
	rc = ptp->ops->read_tx_ts(edev->cdev, &timestamp);
	spin_unlock_bh(&ptp->lock);
	if (rc) {
	if (unlikely(timedout)) {
	DP_INFO(edev, "Tx timestamp is not recorded\n");
	dev_kfree_skb_any(ptp->tx_skb);
	ptp->tx_skb = NULL;
	clear_bit_unlock(QEDE_FLAGS_PTP_TX_IN_PRORGESS,
	&edev->flags);
	edev->ptp_skip_txts++;
	} else {
	/* Reschedule to keep checking for a valid TS value */
	schedule_work(&ptp->work);
	}
	return;
	}

	ns = timecounter_cyc2time(&ptp->tc, timestamp);
	memset(&shhwtstamps, 0, sizeof(shhwtstamps));
	shhwtstamps.hwtstamp = ns_to_ktime(ns);
	skb_tstamp_tx(ptp->tx_skb, &shhwtstamps);
	dev_kfree_skb_any(ptp->tx_skb);
	ptp->tx_skb = NULL;
	clear_bit_unlock(QEDE_FLAGS_PTP_TX_IN_PRORGESS, &edev->flags);

	DP_VERBOSE(edev, QED_MSG_DEBUG,
	"Tx timestamp, timestamp cycles = %llu, ns = %llu\n",
	timestamp, ns);
	}

	/* Read the PHC. This API is invoked with ptp_lock held. */
	static u64 qede_ptp_read_cc(const struct cyclecounter *cc)
	{
	struct qede_dev *edev;
	struct qede_ptp *ptp;
	u64 phc_cycles;
	int rc;

	ptp = container_of(cc, struct qede_ptp, cc);
	edev = ptp->edev;
	rc = ptp->ops->read_cc(edev->cdev, &phc_cycles);
	if (rc)
	WARN_ONCE(1, "PHC read err %d\n", rc);

	DP_VERBOSE(edev, QED_MSG_DEBUG, "PHC read cycles = %llu\n", phc_cycles);

	return phc_cycles;
	}

	static int qede_ptp_cfg_filters(struct qede_dev *edev)
	{
	enum qed_ptp_hwtstamp_tx_type tx_type = QED_PTP_HWTSTAMP_TX_ON;
	enum qed_ptp_filter_type rx_filter = QED_PTP_FILTER_NONE;
	struct qede_ptp *ptp = edev->ptp;

	if (!ptp)
	return -EIO;

	if (!ptp->hw_ts_ioctl_called) {
	DP_INFO(edev, "TS IOCTL not called\n");
	return 0;
	}

	switch (ptp->tx_type) {
	case HWTSTAMP_TX_ON:
	set_bit(QEDE_FLAGS_TX_TIMESTAMPING_EN, &edev->flags);
	tx_type = QED_PTP_HWTSTAMP_TX_ON;
	break;

	case HWTSTAMP_TX_OFF:
	clear_bit(QEDE_FLAGS_TX_TIMESTAMPING_EN, &edev->flags);
	tx_type = QED_PTP_HWTSTAMP_TX_OFF;
	break;

	case HWTSTAMP_TX_ONESTEP_SYNC:
	case HWTSTAMP_TX_ONESTEP_P2P:
	DP_ERR(edev, "One-step timestamping is not supported\n");
	return -ERANGE;
	}

	spin_lock_bh(&ptp->lock);
	switch (ptp->rx_filter) {
	case HWTSTAMP_FILTER_NONE:
	rx_filter = QED_PTP_FILTER_NONE;
	break;
	case HWTSTAMP_FILTER_ALL:
	case HWTSTAMP_FILTER_SOME:
	case HWTSTAMP_FILTER_NTP_ALL:
	ptp->rx_filter = HWTSTAMP_FILTER_NONE;
	rx_filter = QED_PTP_FILTER_ALL;
	break;
	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
	ptp->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
	rx_filter = QED_PTP_FILTER_V1_L4_EVENT;
	break;
	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
	ptp->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
	/* Initialize PTP detection for UDP/IPv4 events */
	rx_filter = QED_PTP_FILTER_V1_L4_GEN;
	break;
	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
	ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
	rx_filter = QED_PTP_FILTER_V2_L4_EVENT;
	break;
	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
	ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
	/* Initialize PTP detection for UDP/IPv4 or UDP/IPv6 events */
	rx_filter = QED_PTP_FILTER_V2_L4_GEN;
	break;
	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
	ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
	rx_filter = QED_PTP_FILTER_V2_L2_EVENT;
	break;
	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
	ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
	/* Initialize PTP detection L2 events */
	rx_filter = QED_PTP_FILTER_V2_L2_GEN;
	break;
	case HWTSTAMP_FILTER_PTP_V2_EVENT:
	ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
	rx_filter = QED_PTP_FILTER_V2_EVENT;
	break;
	case HWTSTAMP_FILTER_PTP_V2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
	ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
	/* Initialize PTP detection L2, UDP/IPv4 or UDP/IPv6 events */
	rx_filter = QED_PTP_FILTER_V2_GEN;
	break;
	}

	ptp->ops->cfg_filters(edev->cdev, rx_filter, tx_type);

	spin_unlock_bh(&ptp->lock);

	return 0;
	}

	int qede_ptp_hw_ts(struct qede_dev edev, struct ifreq ifr)
	{
	struct hwtstamp_config config;
	struct qede_ptp *ptp;
	int rc;

	ptp = edev->ptp;
	if (!ptp)
	return -EIO;

	if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
	return -EFAULT;

	DP_VERBOSE(edev, QED_MSG_DEBUG,
	"HWTSTAMP IOCTL: Requested tx_type = %d, requested rx_filters = %d\n",
	config.tx_type, config.rx_filter);

	if (config.flags) {
	DP_ERR(edev, "config.flags is reserved for future use\n");
	return -EINVAL;
	}

	ptp->hw_ts_ioctl_called = 1;
	ptp->tx_type = config.tx_type;
	ptp->rx_filter = config.rx_filter;

	rc = qede_ptp_cfg_filters(edev);
	if (rc)
	return rc;

	config.rx_filter = ptp->rx_filter;

	return copy_to_user(ifr->ifr_data, &config,
	sizeof(config)) ? -EFAULT : 0;
	}

	int qede_ptp_get_ts_info(struct qede_dev edev, struct ethtool_ts_info info)
	{
	struct qede_ptp *ptp = edev->ptp;

	if (!ptp) {
	info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE \|
	SOF_TIMESTAMPING_RX_SOFTWARE \|
	SOF_TIMESTAMPING_SOFTWARE;
	info->phc_index = -1;

	return 0;
	}

	info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE \|
	SOF_TIMESTAMPING_RX_SOFTWARE \|
	SOF_TIMESTAMPING_SOFTWARE \|
	SOF_TIMESTAMPING_TX_HARDWARE \|
	SOF_TIMESTAMPING_RX_HARDWARE \|
	SOF_TIMESTAMPING_RAW_HARDWARE;

	if (ptp->clock)
	info->phc_index = ptp_clock_index(ptp->clock);
	else
	info->phc_index = -1;

	info->rx_filters = BIT(HWTSTAMP_FILTER_NONE) \|
	BIT(HWTSTAMP_FILTER_PTP_V1_L4_EVENT) \|
	BIT(HWTSTAMP_FILTER_PTP_V1_L4_SYNC) \|
	BIT(HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ) \|
	BIT(HWTSTAMP_FILTER_PTP_V2_L4_EVENT) \|
	BIT(HWTSTAMP_FILTER_PTP_V2_L4_SYNC) \|
	BIT(HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ) \|
	BIT(HWTSTAMP_FILTER_PTP_V2_L2_EVENT) \|
	BIT(HWTSTAMP_FILTER_PTP_V2_L2_SYNC) \|
	BIT(HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ) \|
	BIT(HWTSTAMP_FILTER_PTP_V2_EVENT) \|
	BIT(HWTSTAMP_FILTER_PTP_V2_SYNC) \|
	BIT(HWTSTAMP_FILTER_PTP_V2_DELAY_REQ);

	info->tx_types = BIT(HWTSTAMP_TX_OFF) \| BIT(HWTSTAMP_TX_ON);

	return 0;
	}

	void qede_ptp_disable(struct qede_dev *edev)
	{
	struct qede_ptp *ptp;

	ptp = edev->ptp;
	if (!ptp)
	return;

	if (ptp->clock) {
	ptp_clock_unregister(ptp->clock);
	ptp->clock = NULL;
	}

	/* Cancel PTP work queue. Should be done after the Tx queues are
	* drained to prevent additional scheduling.
	*/
	cancel_work_sync(&ptp->work);
	if (ptp->tx_skb) {
	dev_kfree_skb_any(ptp->tx_skb);
	ptp->tx_skb = NULL;
	}

	/* Disable PTP in HW */
	spin_lock_bh(&ptp->lock);
	ptp->ops->disable(edev->cdev);
	spin_unlock_bh(&ptp->lock);

	kfree(ptp);
	edev->ptp = NULL;
	}

	static int qede_ptp_init(struct qede_dev *edev, bool init_tc)
	{
	struct qede_ptp *ptp;
	int rc;

	ptp = edev->ptp;
	if (!ptp)
	return -EINVAL;

	spin_lock_init(&ptp->lock);

	/* Configure PTP in HW */
	rc = ptp->ops->enable(edev->cdev);
	if (rc) {
	DP_INFO(edev, "PTP HW enable failed\n");
	return rc;
	}

	/* Init work queue for Tx timestamping */
	INIT_WORK(&ptp->work, qede_ptp_task);

	/* Init cyclecounter and timecounter. This is done only in the first
	* load. If done in every load, PTP application will fail when doing
	* unload / load (e.g. MTU change) while it is running.
	*/
	if (init_tc) {
	memset(&ptp->cc, 0, sizeof(ptp->cc));
	ptp->cc.read = qede_ptp_read_cc;
	ptp->cc.mask = CYCLECOUNTER_MASK(64);
	ptp->cc.shift = 0;
	ptp->cc.mult = 1;

	timecounter_init(&ptp->tc, &ptp->cc,
	ktime_to_ns(ktime_get_real()));
	}

	return rc;
	}

	int qede_ptp_enable(struct qede_dev *edev, bool init_tc)
	{
	struct qede_ptp *ptp;
	int rc;

	ptp = kzalloc(sizeof(*ptp), GFP_KERNEL);
	if (!ptp) {
	DP_INFO(edev, "Failed to allocate struct for PTP\n");
	return -ENOMEM;
	}

	ptp->edev = edev;
	ptp->ops = edev->ops->ptp;
	if (!ptp->ops) {
	DP_INFO(edev, "PTP enable failed\n");
	rc = -EIO;
	goto err1;
	}

	edev->ptp = ptp;

	rc = qede_ptp_init(edev, init_tc);
	if (rc)
	goto err1;

	qede_ptp_cfg_filters(edev);

	/* Fill the ptp_clock_info struct and register PTP clock */
	ptp->clock_info.owner = THIS_MODULE;
	snprintf(ptp->clock_info.name, 16, "%s", edev->ndev->name);
	ptp->clock_info.max_adj = QED_MAX_PHC_DRIFT_PPB;
	ptp->clock_info.n_alarm = 0;
	ptp->clock_info.n_ext_ts = 0;
	ptp->clock_info.n_per_out = 0;
	ptp->clock_info.pps = 0;
	ptp->clock_info.adjfreq = qede_ptp_adjfreq;
	ptp->clock_info.adjtime = qede_ptp_adjtime;
	ptp->clock_info.gettime64 = qede_ptp_gettime;
	ptp->clock_info.settime64 = qede_ptp_settime;
	ptp->clock_info.enable = qede_ptp_ancillary_feature_enable;

	ptp->clock = ptp_clock_register(&ptp->clock_info, &edev->pdev->dev);
	if (IS_ERR(ptp->clock)) {
	DP_ERR(edev, "PTP clock registration failed\n");
	qede_ptp_disable(edev);
	rc = -EINVAL;
	goto err2;
	}

	return 0;

	err1:
	kfree(ptp);
	err2:
	edev->ptp = NULL;

	return rc;
	}

	void qede_ptp_tx_ts(struct qede_dev edev, struct sk_buff skb)
	{
	struct qede_ptp *ptp;

	ptp = edev->ptp;
	if (!ptp)
	return;

	if (test_and_set_bit_lock(QEDE_FLAGS_PTP_TX_IN_PRORGESS,
	&edev->flags)) {
	DP_ERR(edev, "Timestamping in progress\n");
	edev->ptp_skip_txts++;
	return;
	}

	if (unlikely(!test_bit(QEDE_FLAGS_TX_TIMESTAMPING_EN, &edev->flags))) {
	DP_ERR(edev,
	"Tx timestamping was not enabled, this packet will not be timestamped\n");
	clear_bit_unlock(QEDE_FLAGS_PTP_TX_IN_PRORGESS, &edev->flags);
	edev->ptp_skip_txts++;
	} else if (unlikely(ptp->tx_skb)) {
	DP_ERR(edev,
	"The device supports only a single outstanding packet to timestamp, this packet will not be timestamped\n");
	clear_bit_unlock(QEDE_FLAGS_PTP_TX_IN_PRORGESS, &edev->flags);
	edev->ptp_skip_txts++;
	} else {
	skb_shinfo(skb)->tx_flags \|= SKBTX_IN_PROGRESS;
	/* schedule check for Tx timestamp */
	ptp->tx_skb = skb_get(skb);
	ptp->ptp_tx_start = jiffies;
	schedule_work(&ptp->work);
	}
	}

	void qede_ptp_rx_ts(struct qede_dev edev, struct sk_buff skb)
	{
	struct qede_ptp *ptp;
	u64 timestamp, ns;
	int rc;

	ptp = edev->ptp;
	if (!ptp)
	return;

	spin_lock_bh(&ptp->lock);
	rc = ptp->ops->read_rx_ts(edev->cdev, &timestamp);
	if (rc) {
	spin_unlock_bh(&ptp->lock);
	DP_INFO(edev, "Invalid Rx timestamp\n");
	return;
	}

	ns = timecounter_cyc2time(&ptp->tc, timestamp);
	spin_unlock_bh(&ptp->lock);
	skb_hwtstamps(skb)->hwtstamp = ns_to_ktime(ns);
	DP_VERBOSE(edev, QED_MSG_DEBUG,
	"Rx timestamp, timestamp cycles = %llu, ns = %llu\n",
	timestamp, ns);
	}