| /* |
| * Copyright (c) 2015, Mellanox Technologies. All rights reserved. |
| * |
| * 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 <linux/clocksource.h> |
| #include "en.h" |
| |
| enum { |
| MLX5E_CYCLES_SHIFT = 23 |
| }; |
| |
| void mlx5e_fill_hwstamp(struct mlx5e_tstamp *tstamp, u64 timestamp, |
| struct skb_shared_hwtstamps *hwts) |
| { |
| u64 nsec; |
| |
| read_lock(&tstamp->lock); |
| nsec = timecounter_cyc2time(&tstamp->clock, timestamp); |
| read_unlock(&tstamp->lock); |
| |
| hwts->hwtstamp = ns_to_ktime(nsec); |
| } |
| |
| static cycle_t mlx5e_read_internal_timer(const struct cyclecounter *cc) |
| { |
| struct mlx5e_tstamp *tstamp = container_of(cc, struct mlx5e_tstamp, |
| cycles); |
| |
| return mlx5_read_internal_timer(tstamp->mdev) & cc->mask; |
| } |
| |
| static void mlx5e_timestamp_overflow(struct work_struct *work) |
| { |
| struct delayed_work *dwork = to_delayed_work(work); |
| struct mlx5e_tstamp *tstamp = container_of(dwork, struct mlx5e_tstamp, |
| overflow_work); |
| unsigned long flags; |
| |
| write_lock_irqsave(&tstamp->lock, flags); |
| timecounter_read(&tstamp->clock); |
| write_unlock_irqrestore(&tstamp->lock, flags); |
| schedule_delayed_work(&tstamp->overflow_work, tstamp->overflow_period); |
| } |
| |
| int mlx5e_hwstamp_set(struct net_device *dev, struct ifreq *ifr) |
| { |
| struct mlx5e_priv *priv = netdev_priv(dev); |
| struct hwtstamp_config config; |
| |
| if (!MLX5_CAP_GEN(priv->mdev, device_frequency_khz)) |
| return -EOPNOTSUPP; |
| |
| if (copy_from_user(&config, ifr->ifr_data, sizeof(config))) |
| return -EFAULT; |
| |
| /* TX HW timestamp */ |
| switch (config.tx_type) { |
| case HWTSTAMP_TX_OFF: |
| case HWTSTAMP_TX_ON: |
| break; |
| default: |
| return -ERANGE; |
| } |
| |
| /* RX HW timestamp */ |
| switch (config.rx_filter) { |
| case HWTSTAMP_FILTER_NONE: |
| break; |
| case HWTSTAMP_FILTER_ALL: |
| case HWTSTAMP_FILTER_SOME: |
| case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: |
| case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: |
| case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: |
| case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: |
| case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: |
| case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: |
| case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: |
| case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: |
| case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: |
| case HWTSTAMP_FILTER_PTP_V2_EVENT: |
| case HWTSTAMP_FILTER_PTP_V2_SYNC: |
| case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: |
| config.rx_filter = HWTSTAMP_FILTER_ALL; |
| break; |
| default: |
| return -ERANGE; |
| } |
| |
| memcpy(&priv->tstamp.hwtstamp_config, &config, sizeof(config)); |
| |
| return copy_to_user(ifr->ifr_data, &config, |
| sizeof(config)) ? -EFAULT : 0; |
| } |
| |
| int mlx5e_hwstamp_get(struct net_device *dev, struct ifreq *ifr) |
| { |
| struct mlx5e_priv *priv = netdev_priv(dev); |
| struct hwtstamp_config *cfg = &priv->tstamp.hwtstamp_config; |
| |
| if (!MLX5_CAP_GEN(priv->mdev, device_frequency_khz)) |
| return -EOPNOTSUPP; |
| |
| return copy_to_user(ifr->ifr_data, cfg, sizeof(*cfg)) ? -EFAULT : 0; |
| } |
| |
| static int mlx5e_ptp_settime(struct ptp_clock_info *ptp, |
| const struct timespec64 *ts) |
| { |
| struct mlx5e_tstamp *tstamp = container_of(ptp, struct mlx5e_tstamp, |
| ptp_info); |
| u64 ns = timespec64_to_ns(ts); |
| unsigned long flags; |
| |
| write_lock_irqsave(&tstamp->lock, flags); |
| timecounter_init(&tstamp->clock, &tstamp->cycles, ns); |
| write_unlock_irqrestore(&tstamp->lock, flags); |
| |
| return 0; |
| } |
| |
| static int mlx5e_ptp_gettime(struct ptp_clock_info *ptp, |
| struct timespec64 *ts) |
| { |
| struct mlx5e_tstamp *tstamp = container_of(ptp, struct mlx5e_tstamp, |
| ptp_info); |
| u64 ns; |
| unsigned long flags; |
| |
| write_lock_irqsave(&tstamp->lock, flags); |
| ns = timecounter_read(&tstamp->clock); |
| write_unlock_irqrestore(&tstamp->lock, flags); |
| |
| *ts = ns_to_timespec64(ns); |
| |
| return 0; |
| } |
| |
| static int mlx5e_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta) |
| { |
| struct mlx5e_tstamp *tstamp = container_of(ptp, struct mlx5e_tstamp, |
| ptp_info); |
| unsigned long flags; |
| |
| write_lock_irqsave(&tstamp->lock, flags); |
| timecounter_adjtime(&tstamp->clock, delta); |
| write_unlock_irqrestore(&tstamp->lock, flags); |
| |
| return 0; |
| } |
| |
| static int mlx5e_ptp_adjfreq(struct ptp_clock_info *ptp, s32 delta) |
| { |
| u64 adj; |
| u32 diff; |
| unsigned long flags; |
| int neg_adj = 0; |
| struct mlx5e_tstamp *tstamp = container_of(ptp, struct mlx5e_tstamp, |
| ptp_info); |
| |
| if (delta < 0) { |
| neg_adj = 1; |
| delta = -delta; |
| } |
| |
| adj = tstamp->nominal_c_mult; |
| adj *= delta; |
| diff = div_u64(adj, 1000000000ULL); |
| |
| write_lock_irqsave(&tstamp->lock, flags); |
| timecounter_read(&tstamp->clock); |
| tstamp->cycles.mult = neg_adj ? tstamp->nominal_c_mult - diff : |
| tstamp->nominal_c_mult + diff; |
| write_unlock_irqrestore(&tstamp->lock, flags); |
| |
| return 0; |
| } |
| |
| static const struct ptp_clock_info mlx5e_ptp_clock_info = { |
| .owner = THIS_MODULE, |
| .max_adj = 100000000, |
| .n_alarm = 0, |
| .n_ext_ts = 0, |
| .n_per_out = 0, |
| .n_pins = 0, |
| .pps = 0, |
| .adjfreq = mlx5e_ptp_adjfreq, |
| .adjtime = mlx5e_ptp_adjtime, |
| .gettime64 = mlx5e_ptp_gettime, |
| .settime64 = mlx5e_ptp_settime, |
| .enable = NULL, |
| }; |
| |
| static void mlx5e_timestamp_init_config(struct mlx5e_tstamp *tstamp) |
| { |
| tstamp->hwtstamp_config.tx_type = HWTSTAMP_TX_OFF; |
| tstamp->hwtstamp_config.rx_filter = HWTSTAMP_FILTER_NONE; |
| } |
| |
| void mlx5e_timestamp_init(struct mlx5e_priv *priv) |
| { |
| struct mlx5e_tstamp *tstamp = &priv->tstamp; |
| u64 ns; |
| u64 frac = 0; |
| u32 dev_freq; |
| |
| mlx5e_timestamp_init_config(tstamp); |
| dev_freq = MLX5_CAP_GEN(priv->mdev, device_frequency_khz); |
| if (!dev_freq) { |
| mlx5_core_warn(priv->mdev, "invalid device_frequency_khz, aborting HW clock init\n"); |
| return; |
| } |
| rwlock_init(&tstamp->lock); |
| tstamp->cycles.read = mlx5e_read_internal_timer; |
| tstamp->cycles.shift = MLX5E_CYCLES_SHIFT; |
| tstamp->cycles.mult = clocksource_khz2mult(dev_freq, |
| tstamp->cycles.shift); |
| tstamp->nominal_c_mult = tstamp->cycles.mult; |
| tstamp->cycles.mask = CLOCKSOURCE_MASK(41); |
| tstamp->mdev = priv->mdev; |
| |
| timecounter_init(&tstamp->clock, &tstamp->cycles, |
| ktime_to_ns(ktime_get_real())); |
| |
| /* Calculate period in seconds to call the overflow watchdog - to make |
| * sure counter is checked at least once every wrap around. |
| */ |
| ns = cyclecounter_cyc2ns(&tstamp->cycles, tstamp->cycles.mask, |
| frac, &frac); |
| do_div(ns, NSEC_PER_SEC / 2 / HZ); |
| tstamp->overflow_period = ns; |
| |
| INIT_DELAYED_WORK(&tstamp->overflow_work, mlx5e_timestamp_overflow); |
| if (tstamp->overflow_period) |
| schedule_delayed_work(&tstamp->overflow_work, 0); |
| else |
| mlx5_core_warn(priv->mdev, "invalid overflow period, overflow_work is not scheduled\n"); |
| |
| /* Configure the PHC */ |
| tstamp->ptp_info = mlx5e_ptp_clock_info; |
| snprintf(tstamp->ptp_info.name, 16, "mlx5 ptp"); |
| |
| tstamp->ptp = ptp_clock_register(&tstamp->ptp_info, |
| &priv->mdev->pdev->dev); |
| if (IS_ERR_OR_NULL(tstamp->ptp)) { |
| mlx5_core_warn(priv->mdev, "ptp_clock_register failed %ld\n", |
| PTR_ERR(tstamp->ptp)); |
| tstamp->ptp = NULL; |
| } |
| } |
| |
| void mlx5e_timestamp_cleanup(struct mlx5e_priv *priv) |
| { |
| struct mlx5e_tstamp *tstamp = &priv->tstamp; |
| |
| if (!MLX5_CAP_GEN(priv->mdev, device_frequency_khz)) |
| return; |
| |
| if (priv->tstamp.ptp) { |
| ptp_clock_unregister(priv->tstamp.ptp); |
| priv->tstamp.ptp = NULL; |
| } |
| |
| cancel_delayed_work_sync(&tstamp->overflow_work); |
| } |