1 files changed, 589 insertions, 0 deletions
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_phc.c b/drivers/net/ethernet/pensando/ionic/ionic_phc.c
new file mode 100644
index 000000000000..86ae5011ac9b
--- /dev/null
+++ b/drivers/net/ethernet/pensando/ionic/ionic_phc.c
@@ -0,0 +1,589 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2017 - 2021 Pensando Systems, Inc */
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+
+#include "ionic.h"
+#include "ionic_bus.h"
+#include "ionic_lif.h"
+#include "ionic_ethtool.h"
+
+static int ionic_hwstamp_tx_mode(int config_tx_type)
+{
+	switch (config_tx_type) {
+	case HWTSTAMP_TX_OFF:
+		return IONIC_TXSTAMP_OFF;
+	case HWTSTAMP_TX_ON:
+		return IONIC_TXSTAMP_ON;
+	case HWTSTAMP_TX_ONESTEP_SYNC:
+		return IONIC_TXSTAMP_ONESTEP_SYNC;
+#ifdef HAVE_HWSTAMP_TX_ONESTEP_P2P
+	case HWTSTAMP_TX_ONESTEP_P2P:
+		return IONIC_TXSTAMP_ONESTEP_P2P;
+#endif
+	default:
+		return -ERANGE;
+	}
+}
+
+static u64 ionic_hwstamp_rx_filt(int config_rx_filter)
+{
+	switch (config_rx_filter) {
+	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
+		return IONIC_PKT_CLS_PTP1_ALL;
+	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
+		return IONIC_PKT_CLS_PTP1_SYNC;
+	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
+		return IONIC_PKT_CLS_PTP1_SYNC | IONIC_PKT_CLS_PTP1_DREQ;
+
+	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+		return IONIC_PKT_CLS_PTP2_L4_ALL;
+	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+		return IONIC_PKT_CLS_PTP2_L4_SYNC;
+	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
+		return IONIC_PKT_CLS_PTP2_L4_SYNC | IONIC_PKT_CLS_PTP2_L4_DREQ;
+
+	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+		return IONIC_PKT_CLS_PTP2_L2_ALL;
+	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+		return IONIC_PKT_CLS_PTP2_L2_SYNC;
+	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+		return IONIC_PKT_CLS_PTP2_L2_SYNC | IONIC_PKT_CLS_PTP2_L2_DREQ;
+
+	case HWTSTAMP_FILTER_PTP_V2_EVENT:
+		return IONIC_PKT_CLS_PTP2_ALL;
+	case HWTSTAMP_FILTER_PTP_V2_SYNC:
+		return IONIC_PKT_CLS_PTP2_SYNC;
+	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+		return IONIC_PKT_CLS_PTP2_SYNC | IONIC_PKT_CLS_PTP2_DREQ;
+
+	case HWTSTAMP_FILTER_NTP_ALL:
+		return IONIC_PKT_CLS_NTP_ALL;
+
+	default:
+		return 0;
+	}
+}
+
+int ionic_lif_hwstamp_set(struct ionic_lif *lif, struct ifreq *ifr)
+{
+	struct ionic *ionic = lif->ionic;
+	struct hwtstamp_config config;
+	int tx_mode = 0;
+	u64 rx_filt = 0;
+	int err, err2;
+	bool rx_all;
+	__le64 mask;
+
+	if (!lif->phc || !lif->phc->ptp)
+		return -EOPNOTSUPP;
+
+	if (ifr) {
+		if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
+			return -EFAULT;
+	} else {
+		/* if called with ifr == NULL, behave as if called with the
+		 * current ts_config from the initial cleared state.
+		 */
+		memcpy(&config, &lif->phc->ts_config, sizeof(config));
+		memset(&lif->phc->ts_config, 0, sizeof(config));
+	}
+
+	tx_mode = ionic_hwstamp_tx_mode(config.tx_type);
+	if (tx_mode < 0)
+		return tx_mode;
+
+	mask = cpu_to_le64(BIT_ULL(tx_mode));
+	if ((ionic->ident.lif.eth.hwstamp_tx_modes & mask) != mask)
+		return -ERANGE;
+
+	rx_filt = ionic_hwstamp_rx_filt(config.rx_filter);
+	rx_all = config.rx_filter != HWTSTAMP_FILTER_NONE && !rx_filt;
+
+	mask = cpu_to_le64(rx_filt);
+	if ((ionic->ident.lif.eth.hwstamp_rx_filters & mask) != mask) {
+		rx_filt = 0;
+		rx_all = true;
+		config.rx_filter = HWTSTAMP_FILTER_ALL;
+	}
+
+	dev_dbg(ionic->dev, "config_rx_filter %d rx_filt %#llx rx_all %d\n",
+		config.rx_filter, rx_filt, rx_all);
+
+	mutex_lock(&lif->phc->config_lock);
+
+	if (tx_mode) {
+		err = ionic_lif_create_hwstamp_txq(lif);
+		if (err)
+			goto err_queues;
+	}
+
+	if (rx_filt) {
+		err = ionic_lif_create_hwstamp_rxq(lif);
+		if (err)
+			goto err_queues;
+	}
+
+	if (tx_mode != lif->phc->ts_config_tx_mode) {
+		err = ionic_lif_set_hwstamp_txmode(lif, tx_mode);
+		if (err)
+			goto err_txmode;
+	}
+
+	if (rx_filt != lif->phc->ts_config_rx_filt) {
+		err = ionic_lif_set_hwstamp_rxfilt(lif, rx_filt);
+		if (err)
+			goto err_rxfilt;
+	}
+
+	if (rx_all != (lif->phc->ts_config.rx_filter == HWTSTAMP_FILTER_ALL)) {
+		err = ionic_lif_config_hwstamp_rxq_all(lif, rx_all);
+		if (err)
+			goto err_rxall;
+	}
+
+	if (ifr) {
+		err = copy_to_user(ifr->ifr_data, &config, sizeof(config));
+		if (err) {
+			err = -EFAULT;
+			goto err_final;
+		}
+	}
+
+	memcpy(&lif->phc->ts_config, &config, sizeof(config));
+	lif->phc->ts_config_rx_filt = rx_filt;
+	lif->phc->ts_config_tx_mode = tx_mode;
+
+	mutex_unlock(&lif->phc->config_lock);
+
+	return 0;
+
+err_final:
+	if (rx_all != (lif->phc->ts_config.rx_filter == HWTSTAMP_FILTER_ALL)) {
+		rx_all = lif->phc->ts_config.rx_filter == HWTSTAMP_FILTER_ALL;
+		err2 = ionic_lif_config_hwstamp_rxq_all(lif, rx_all);
+		if (err2)
+			dev_err(ionic->dev,
+				"Failed to revert all-rxq timestamp config: %d\n", err2);
+	}
+err_rxall:
+	if (rx_filt != lif->phc->ts_config_rx_filt) {
+		rx_filt = lif->phc->ts_config_rx_filt;
+		err2 = ionic_lif_set_hwstamp_rxfilt(lif, rx_filt);
+		if (err2)
+			dev_err(ionic->dev,
+				"Failed to revert rx timestamp filter: %d\n", err2);
+	}
+err_rxfilt:
+	if (tx_mode != lif->phc->ts_config_tx_mode) {
+		tx_mode = lif->phc->ts_config_tx_mode;
+		err2 = ionic_lif_set_hwstamp_txmode(lif, tx_mode);
+		if (err2)
+			dev_err(ionic->dev,
+				"Failed to revert tx timestamp mode: %d\n", err2);
+	}
+err_txmode:
+	/* special queues remain allocated, just unused */
+err_queues:
+	mutex_unlock(&lif->phc->config_lock);
+	return err;
+}
+
+int ionic_lif_hwstamp_get(struct ionic_lif *lif, struct ifreq *ifr)
+{
+	struct hwtstamp_config config;
+
+	if (!lif->phc || !lif->phc->ptp)
+		return -EOPNOTSUPP;
+
+	mutex_lock(&lif->phc->config_lock);
+	memcpy(&config, &lif->phc->ts_config, sizeof(config));
+	mutex_unlock(&lif->phc->config_lock);
+
+	return copy_to_user(ifr->ifr_data, &config, sizeof(config));
+}
+
+static u64 ionic_hwstamp_read(struct ionic *ionic,
+			      struct ptp_system_timestamp *sts)
+{
+	u32 tick_high_before, tick_high, tick_low;
+
+	/* read and discard low part to defeat hw staging of high part */
+	(void)ioread32(&ionic->idev.hwstamp_regs->tick_low);
+
+	tick_high_before = ioread32(&ionic->idev.hwstamp_regs->tick_high);
+
+	ptp_read_system_prets(sts);
+	tick_low = ioread32(&ionic->idev.hwstamp_regs->tick_low);
+	ptp_read_system_postts(sts);
+
+	tick_high = ioread32(&ionic->idev.hwstamp_regs->tick_high);
+
+	/* If tick_high changed, re-read tick_low once more.  Assume tick_high
+	 * cannot change again so soon as in the span of re-reading tick_low.
+	 */
+	if (tick_high != tick_high_before) {
+		ptp_read_system_prets(sts);
+		tick_low = ioread32(&ionic->idev.hwstamp_regs->tick_low);
+		ptp_read_system_postts(sts);
+	}
+
+	return (u64)tick_low | ((u64)tick_high << 32);
+}
+
+static u64 ionic_cc_read(const struct cyclecounter *cc)
+{
+	struct ionic_phc *phc = container_of(cc, struct ionic_phc, cc);
+	struct ionic *ionic = phc->lif->ionic;
+
+	return ionic_hwstamp_read(ionic, NULL);
+}
+
+static int ionic_setphc_cmd(struct ionic_phc *phc, struct ionic_admin_ctx *ctx)
+{
+	ctx->work = COMPLETION_INITIALIZER_ONSTACK(ctx->work);
+
+	ctx->cmd.lif_setphc.opcode = IONIC_CMD_LIF_SETPHC;
+	ctx->cmd.lif_setphc.lif_index = cpu_to_le16(phc->lif->index);
+
+	ctx->cmd.lif_setphc.tick = cpu_to_le64(phc->tc.cycle_last);
+	ctx->cmd.lif_setphc.nsec = cpu_to_le64(phc->tc.nsec);
+	ctx->cmd.lif_setphc.frac = cpu_to_le64(phc->tc.frac);
+	ctx->cmd.lif_setphc.mult = cpu_to_le32(phc->cc.mult);
+	ctx->cmd.lif_setphc.shift = cpu_to_le32(phc->cc.shift);
+
+	return ionic_adminq_post(phc->lif, ctx);
+}
+
+static int ionic_phc_adjfine(struct ptp_clock_info *info, long scaled_ppm)
+{
+	struct ionic_phc *phc = container_of(info, struct ionic_phc, ptp_info);
+	struct ionic_admin_ctx ctx = {};
+	unsigned long irqflags;
+	s64 adj;
+	int err;
+
+	/* Reject phc adjustments during device upgrade */
+	if (test_bit(IONIC_LIF_F_FW_RESET, phc->lif->state))
+		return -EBUSY;
+
+	/* Adjustment value scaled by 2^16 million */
+	adj = (s64)scaled_ppm * phc->init_cc_mult;
+
+	/* Adjustment value to scale */
+	adj /= (s64)SCALED_PPM;
+
+	/* Final adjusted multiplier */
+	adj += phc->init_cc_mult;
+
+	spin_lock_irqsave(&phc->lock, irqflags);
+
+	/* update the point-in-time basis to now, before adjusting the rate */
+	timecounter_read(&phc->tc);
+	phc->cc.mult = adj;
+
+	/* Setphc commands are posted in-order, sequenced by phc->lock.  We
+	 * need to drop the lock before waiting for the command to complete.
+	 */
+	err = ionic_setphc_cmd(phc, &ctx);
+
+	spin_unlock_irqrestore(&phc->lock, irqflags);
+
+	return ionic_adminq_wait(phc->lif, &ctx, err);
+}
+
+static int ionic_phc_adjtime(struct ptp_clock_info *info, s64 delta)
+{
+	struct ionic_phc *phc = container_of(info, struct ionic_phc, ptp_info);
+	struct ionic_admin_ctx ctx = {};
+	unsigned long irqflags;
+	int err;
+
+	/* Reject phc adjustments during device upgrade */
+	if (test_bit(IONIC_LIF_F_FW_RESET, phc->lif->state))
+		return -EBUSY;
+
+	spin_lock_irqsave(&phc->lock, irqflags);
+
+	timecounter_adjtime(&phc->tc, delta);
+
+	/* Setphc commands are posted in-order, sequenced by phc->lock.  We
+	 * need to drop the lock before waiting for the command to complete.
+	 */
+	err = ionic_setphc_cmd(phc, &ctx);
+
+	spin_unlock_irqrestore(&phc->lock, irqflags);
+
+	return ionic_adminq_wait(phc->lif, &ctx, err);
+}
+
+static int ionic_phc_settime64(struct ptp_clock_info *info,
+			       const struct timespec64 *ts)
+{
+	struct ionic_phc *phc = container_of(info, struct ionic_phc, ptp_info);
+	struct ionic_admin_ctx ctx = {};
+	unsigned long irqflags;
+	int err;
+	u64 ns;
+
+	/* Reject phc adjustments during device upgrade */
+	if (test_bit(IONIC_LIF_F_FW_RESET, phc->lif->state))
+		return -EBUSY;
+
+	ns = timespec64_to_ns(ts);
+
+	spin_lock_irqsave(&phc->lock, irqflags);
+
+	timecounter_init(&phc->tc, &phc->cc, ns);
+
+	/* Setphc commands are posted in-order, sequenced by phc->lock.  We
+	 * need to drop the lock before waiting for the command to complete.
+	 */
+	err = ionic_setphc_cmd(phc, &ctx);
+
+	spin_unlock_irqrestore(&phc->lock, irqflags);
+
+	return ionic_adminq_wait(phc->lif, &ctx, err);
+}
+
+static int ionic_phc_gettimex64(struct ptp_clock_info *info,
+				struct timespec64 *ts,
+				struct ptp_system_timestamp *sts)
+{
+	struct ionic_phc *phc = container_of(info, struct ionic_phc, ptp_info);
+	struct ionic *ionic = phc->lif->ionic;
+	unsigned long irqflags;
+	u64 tick, ns;
+
+	/* Do not attempt to read device time during upgrade */
+	if (test_bit(IONIC_LIF_F_FW_RESET, phc->lif->state))
+		return -EBUSY;
+
+	spin_lock_irqsave(&phc->lock, irqflags);
+
+	tick = ionic_hwstamp_read(ionic, sts);
+
+	ns = timecounter_cyc2time(&phc->tc, tick);
+
+	spin_unlock_irqrestore(&phc->lock, irqflags);
+
+	*ts = ns_to_timespec64(ns);
+
+	return 0;
+}
+
+static long ionic_phc_aux_work(struct ptp_clock_info *info)
+{
+	struct ionic_phc *phc = container_of(info, struct ionic_phc, ptp_info);
+	struct ionic_admin_ctx ctx = {};
+	unsigned long irqflags;
+	int err;
+
+	/* Do not update phc during device upgrade, but keep polling to resume
+	 * after upgrade.  Since we don't update the point in time basis, there
+	 * is no expectation that we are maintaining the phc time during the
+	 * upgrade.  After upgrade, it will need to be readjusted back to the
+	 * correct time by the ptp daemon.
+	 */
+	if (test_bit(IONIC_LIF_F_FW_RESET, phc->lif->state))
+		return phc->aux_work_delay;
+
+	spin_lock_irqsave(&phc->lock, irqflags);
+
+	/* update point-in-time basis to now */
+	timecounter_read(&phc->tc);
+
+	/* Setphc commands are posted in-order, sequenced by phc->lock.  We
+	 * need to drop the lock before waiting for the command to complete.
+	 */
+	err = ionic_setphc_cmd(phc, &ctx);
+
+	spin_unlock_irqrestore(&phc->lock, irqflags);
+
+	ionic_adminq_wait(phc->lif, &ctx, err);
+
+	return phc->aux_work_delay;
+}
+
+ktime_t ionic_lif_phc_ktime(struct ionic_lif *lif, u64 tick)
+{
+	unsigned long irqflags;
+	u64 ns;
+
+	if (!lif->phc)
+		return 0;
+
+	spin_lock_irqsave(&lif->phc->lock, irqflags);
+	ns = timecounter_cyc2time(&lif->phc->tc, tick);
+	spin_unlock_irqrestore(&lif->phc->lock, irqflags);
+
+	return ns_to_ktime(ns);
+}
+
+static const struct ptp_clock_info ionic_ptp_info = {
+	.owner		= THIS_MODULE,
+	.name		= "ionic_ptp",
+	.adjfine	= ionic_phc_adjfine,
+	.adjtime	= ionic_phc_adjtime,
+	.gettimex64	= ionic_phc_gettimex64,
+	.settime64	= ionic_phc_settime64,
+	.do_aux_work	= ionic_phc_aux_work,
+};
+
+void ionic_lif_register_phc(struct ionic_lif *lif)
+{
+	if (!lif->phc || !(lif->hw_features & IONIC_ETH_HW_TIMESTAMP))
+		return;
+
+	lif->phc->ptp = ptp_clock_register(&lif->phc->ptp_info, lif->ionic->dev);
+
+	if (IS_ERR(lif->phc->ptp)) {
+		dev_warn(lif->ionic->dev, "Cannot register phc device: %ld\n",
+			 PTR_ERR(lif->phc->ptp));
+
+		lif->phc->ptp = NULL;
+	}
+
+	if (lif->phc->ptp)
+		ptp_schedule_worker(lif->phc->ptp, lif->phc->aux_work_delay);
+}
+
+void ionic_lif_unregister_phc(struct ionic_lif *lif)
+{
+	if (!lif->phc || !lif->phc->ptp)
+		return;
+
+	ptp_clock_unregister(lif->phc->ptp);
+
+	lif->phc->ptp = NULL;
+}
+
+void ionic_lif_alloc_phc(struct ionic_lif *lif)
+{
+	struct ionic *ionic = lif->ionic;
+	struct ionic_phc *phc;
+	u64 delay, diff, mult;
+	u64 frac = 0;
+	u64 features;
+	u32 shift;
+
+	if (!ionic->idev.hwstamp_regs)
+		return;
+
+	features = le64_to_cpu(ionic->ident.lif.eth.config.features);
+	if (!(features & IONIC_ETH_HW_TIMESTAMP))
+		return;
+
+	phc = devm_kzalloc(ionic->dev, sizeof(*phc), GFP_KERNEL);
+	if (!phc)
+		return;
+
+	phc->lif = lif;
+
+	phc->cc.read = ionic_cc_read;
+	phc->cc.mask = le64_to_cpu(ionic->ident.dev.hwstamp_mask);
+	phc->cc.mult = le32_to_cpu(ionic->ident.dev.hwstamp_mult);
+	phc->cc.shift = le32_to_cpu(ionic->ident.dev.hwstamp_shift);
+
+	if (!phc->cc.mult) {
+		dev_err(lif->ionic->dev,
+			"Invalid device PHC mask multiplier %u, disabling HW timestamp support\n",
+			phc->cc.mult);
+		devm_kfree(lif->ionic->dev, phc);
+		lif->phc = NULL;
+		return;
+	}
+
+	dev_dbg(lif->ionic->dev, "Device PHC mask %#llx mult %u shift %u\n",
+		phc->cc.mask, phc->cc.mult, phc->cc.shift);
+
+	spin_lock_init(&phc->lock);
+	mutex_init(&phc->config_lock);
+
+	/* max ticks is limited by the multiplier, or by the update period. */
+	if (phc->cc.shift + 2 + ilog2(IONIC_PHC_UPDATE_NS) >= 64) {
+		/* max ticks that do not overflow when multiplied by max
+		 * adjusted multiplier (twice the initial multiplier)
+		 */
+		diff = U64_MAX / phc->cc.mult / 2;
+	} else {
+		/* approx ticks at four times the update period */
+		diff = (u64)IONIC_PHC_UPDATE_NS << (phc->cc.shift + 2);
+		diff = DIV_ROUND_UP(diff, phc->cc.mult);
+	}
+
+	/* transform to bitmask */
+	diff |= diff >> 1;
+	diff |= diff >> 2;
+	diff |= diff >> 4;
+	diff |= diff >> 8;
+	diff |= diff >> 16;
+	diff |= diff >> 32;
+
+	/* constrain to the hardware bitmask, and use this as the bitmask */
+	diff &= phc->cc.mask;
+	phc->cc.mask = diff;
+
+	/* the wrap period is now defined by diff (or phc->cc.mask)
+	 *
+	 * we will update the time basis at about 1/4 the wrap period, so
+	 * should not see a difference of more than +/- diff/4.
+	 *
+	 * this is sufficient not see a difference of more than +/- diff/2, as
+	 * required by timecounter_cyc2time, to detect an old time stamp.
+	 *
+	 * adjust the initial multiplier, being careful to avoid overflow:
+	 *  - do not overflow 63 bits: init_cc_mult * SCALED_PPM
+	 *  - do not overflow 64 bits: max_mult * (diff / 2)
+	 *
+	 * we want to increase the initial multiplier as much as possible, to
+	 * allow for more precise adjustment in ionic_phc_adjfine.
+	 *
+	 * only adjust the multiplier if we can double it or more.
+	 */
+	mult = U64_MAX / 2 / max(diff / 2, SCALED_PPM);
+	shift = mult / phc->cc.mult;
+	if (shift >= 2) {
+		/* initial multiplier will be 2^n of hardware cc.mult */
+		shift = fls(shift);
+		/* increase cc.mult and cc.shift by the same 2^n and n. */
+		phc->cc.mult <<= shift;
+		phc->cc.shift += shift;
+	}
+
+	dev_dbg(lif->ionic->dev, "Initial PHC mask %#llx mult %u shift %u\n",
+		phc->cc.mask, phc->cc.mult, phc->cc.shift);
+
+	/* frequency adjustments are relative to the initial multiplier */
+	phc->init_cc_mult = phc->cc.mult;
+
+	timecounter_init(&phc->tc, &phc->cc, ktime_get_real_ns());
+
+	/* Update cycle_last at 1/4 the wrap period, or IONIC_PHC_UPDATE_NS */
+	delay = min_t(u64, IONIC_PHC_UPDATE_NS,
+		      cyclecounter_cyc2ns(&phc->cc, diff / 4, 0, &frac));
+	dev_dbg(lif->ionic->dev, "Work delay %llu ms\n", delay / NSEC_PER_MSEC);
+
+	phc->aux_work_delay = nsecs_to_jiffies(delay);
+
+	phc->ptp_info = ionic_ptp_info;
+
+	/* We have allowed to adjust the multiplier up to +/- 1 part per 1.
+	 * Here expressed as NORMAL_PPB (1 billion parts per billion).
+	 */
+	phc->ptp_info.max_adj = NORMAL_PPB;
+
+	lif->phc = phc;
+}
+
+void ionic_lif_free_phc(struct ionic_lif *lif)
+{
+	if (!lif->phc)
+		return;
+
+	mutex_destroy(&lif->phc->config_lock);
+
+	devm_kfree(lif->ionic->dev, lif->phc);
+	lif->phc = NULL;
+}