drivers/net/ethernet/mellanox/mlx5/core/en_clock.c

   1 /*
   2  * Copyright (c) 2015, Mellanox Technologies. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/clocksource.h>
  34 #include "en.h"
  35
  36 enum {
  37         MLX5E_CYCLES_SHIFT      = 23
  38 };
  39
  40 void mlx5e_fill_hwstamp(struct mlx5e_tstamp *tstamp, u64 timestamp,
  41                         struct skb_shared_hwtstamps *hwts)
  42 {
  43         u64 nsec;
  44
  45         read_lock(&tstamp->lock);
  46         nsec = timecounter_cyc2time(&tstamp->clock, timestamp);
  47         read_unlock(&tstamp->lock);
  48
  49         hwts->hwtstamp = ns_to_ktime(nsec);
  50 }
  51
  52 static cycle_t mlx5e_read_internal_timer(const struct cyclecounter *cc)
  53 {
  54         struct mlx5e_tstamp *tstamp = container_of(cc, struct mlx5e_tstamp,
  55                                                    cycles);
  56
  57         return mlx5_read_internal_timer(tstamp->mdev) & cc->mask;
  58 }
  59
  60 static void mlx5e_timestamp_overflow(struct work_struct *work)
  61 {
  62         struct delayed_work *dwork = to_delayed_work(work);
  63         struct mlx5e_tstamp *tstamp = container_of(dwork, struct mlx5e_tstamp,
  64                                                    overflow_work);
  65
  66         write_lock(&tstamp->lock);
  67         timecounter_read(&tstamp->clock);
  68         write_unlock(&tstamp->lock);
  69         schedule_delayed_work(&tstamp->overflow_work, tstamp->overflow_period);
  70 }
  71
  72 int mlx5e_hwstamp_set(struct net_device *dev, struct ifreq *ifr)
  73 {
  74         struct mlx5e_priv *priv = netdev_priv(dev);
  75         struct hwtstamp_config config;
  76
  77         if (!MLX5_CAP_GEN(priv->mdev, device_frequency_khz))
  78                 return -EOPNOTSUPP;
  79
  80         if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
  81                 return -EFAULT;
  82
  83         /* TX HW timestamp */
  84         switch (config.tx_type) {
  85         case HWTSTAMP_TX_OFF:
  86         case HWTSTAMP_TX_ON:
  87                 break;
  88         default:
  89                 return -ERANGE;
  90         }
  91
  92         /* RX HW timestamp */
  93         switch (config.rx_filter) {
  94         case HWTSTAMP_FILTER_NONE:
  95                 break;
  96         case HWTSTAMP_FILTER_ALL:
  97         case HWTSTAMP_FILTER_SOME:
  98         case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
  99         case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
 100         case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
 101         case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
 102         case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
 103         case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
 104         case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
 105         case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
 106         case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
 107         case HWTSTAMP_FILTER_PTP_V2_EVENT:
 108         case HWTSTAMP_FILTER_PTP_V2_SYNC:
 109         case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
 110                 config.rx_filter = HWTSTAMP_FILTER_ALL;
 111                 break;
 112         default:
 113                 return -ERANGE;
 114         }
 115
 116         memcpy(&priv->tstamp.hwtstamp_config, &config, sizeof(config));
 117
 118         return copy_to_user(ifr->ifr_data, &config,
 119                             sizeof(config)) ? -EFAULT : 0;
 120 }
 121
 122 int mlx5e_hwstamp_get(struct net_device *dev, struct ifreq *ifr)
 123 {
 124         struct mlx5e_priv *priv = netdev_priv(dev);
 125         struct hwtstamp_config *cfg = &priv->tstamp.hwtstamp_config;
 126
 127         if (!MLX5_CAP_GEN(priv->mdev, device_frequency_khz))
 128                 return -EOPNOTSUPP;
 129
 130         return copy_to_user(ifr->ifr_data, cfg, sizeof(*cfg)) ? -EFAULT : 0;
 131 }
 132
 133 static int mlx5e_ptp_settime(struct ptp_clock_info *ptp,
 134                              const struct timespec64 *ts)
 135 {
 136         struct mlx5e_tstamp *tstamp = container_of(ptp, struct mlx5e_tstamp,
 137                                                    ptp_info);
 138         u64 ns = timespec64_to_ns(ts);
 139
 140         write_lock(&tstamp->lock);
 141         timecounter_init(&tstamp->clock, &tstamp->cycles, ns);
 142         write_unlock(&tstamp->lock);
 143
 144         return 0;
 145 }
 146
 147 static int mlx5e_ptp_gettime(struct ptp_clock_info *ptp,
 148                              struct timespec64 *ts)
 149 {
 150         struct mlx5e_tstamp *tstamp = container_of(ptp, struct mlx5e_tstamp,
 151                                                    ptp_info);
 152         u64 ns;
 153
 154         write_lock(&tstamp->lock);
 155         ns = timecounter_read(&tstamp->clock);
 156         write_unlock(&tstamp->lock);
 157
 158         *ts = ns_to_timespec64(ns);
 159
 160         return 0;
 161 }
 162
 163 static int mlx5e_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
 164 {
 165         struct mlx5e_tstamp *tstamp = container_of(ptp, struct mlx5e_tstamp,
 166                                                    ptp_info);
 167
 168         write_lock(&tstamp->lock);
 169         timecounter_adjtime(&tstamp->clock, delta);
 170         write_unlock(&tstamp->lock);
 171
 172         return 0;
 173 }
 174
 175 static int mlx5e_ptp_adjfreq(struct ptp_clock_info *ptp, s32 delta)
 176 {
 177         u64 adj;
 178         u32 diff;
 179         int neg_adj = 0;
 180         struct mlx5e_tstamp *tstamp = container_of(ptp, struct mlx5e_tstamp,
 181                                                   ptp_info);
 182
 183         if (delta < 0) {
 184                 neg_adj = 1;
 185                 delta = -delta;
 186         }
 187
 188         adj = tstamp->nominal_c_mult;
 189         adj *= delta;
 190         diff = div_u64(adj, 1000000000ULL);
 191
 192         write_lock(&tstamp->lock);
 193         timecounter_read(&tstamp->clock);
 194         tstamp->cycles.mult = neg_adj ? tstamp->nominal_c_mult - diff :
 195                                         tstamp->nominal_c_mult + diff;
 196         write_unlock(&tstamp->lock);
 197
 198         return 0;
 199 }
 200
 201 static const struct ptp_clock_info mlx5e_ptp_clock_info = {
 202         .owner          = THIS_MODULE,
 203         .max_adj        = 100000000,
 204         .n_alarm        = 0,
 205         .n_ext_ts       = 0,
 206         .n_per_out      = 0,
 207         .n_pins         = 0,
 208         .pps            = 0,
 209         .adjfreq        = mlx5e_ptp_adjfreq,
 210         .adjtime        = mlx5e_ptp_adjtime,
 211         .gettime64      = mlx5e_ptp_gettime,
 212         .settime64      = mlx5e_ptp_settime,
 213         .enable         = NULL,
 214 };
 215
 216 static void mlx5e_timestamp_init_config(struct mlx5e_tstamp *tstamp)
 217 {
 218         tstamp->hwtstamp_config.tx_type = HWTSTAMP_TX_OFF;
 219         tstamp->hwtstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
 220 }
 221
 222 void mlx5e_timestamp_init(struct mlx5e_priv *priv)
 223 {
 224         struct mlx5e_tstamp *tstamp = &priv->tstamp;
 225         u64 ns;
 226         u64 frac = 0;
 227         u32 dev_freq;
 228
 229         mlx5e_timestamp_init_config(tstamp);
 230         dev_freq = MLX5_CAP_GEN(priv->mdev, device_frequency_khz);
 231         if (!dev_freq) {
 232                 mlx5_core_warn(priv->mdev, "invalid device_frequency_khz, aborting HW clock init\n");
 233                 return;
 234         }
 235         rwlock_init(&tstamp->lock);
 236         tstamp->cycles.read = mlx5e_read_internal_timer;
 237         tstamp->cycles.shift = MLX5E_CYCLES_SHIFT;
 238         tstamp->cycles.mult = clocksource_khz2mult(dev_freq,
 239                                                    tstamp->cycles.shift);
 240         tstamp->nominal_c_mult = tstamp->cycles.mult;
 241         tstamp->cycles.mask = CLOCKSOURCE_MASK(41);
 242         tstamp->mdev = priv->mdev;
 243
 244         timecounter_init(&tstamp->clock, &tstamp->cycles,
 245                          ktime_to_ns(ktime_get_real()));
 246
 247         /* Calculate period in seconds to call the overflow watchdog - to make
 248          * sure counter is checked at least once every wrap around.
 249          */
 250         ns = cyclecounter_cyc2ns(&tstamp->cycles, tstamp->cycles.mask,
 251                                  frac, &frac);
 252         do_div(ns, NSEC_PER_SEC / 2 / HZ);
 253         tstamp->overflow_period = ns;
 254
 255         INIT_DELAYED_WORK(&tstamp->overflow_work, mlx5e_timestamp_overflow);
 256         if (tstamp->overflow_period)
 257                 schedule_delayed_work(&tstamp->overflow_work, 0);
 258         else
 259                 mlx5_core_warn(priv->mdev, "invalid overflow period, overflow_work is not scheduled\n");
 260
 261         /* Configure the PHC */
 262         tstamp->ptp_info = mlx5e_ptp_clock_info;
 263         snprintf(tstamp->ptp_info.name, 16, "mlx5 ptp");
 264
 265         tstamp->ptp = ptp_clock_register(&tstamp->ptp_info,
 266                                          &priv->mdev->pdev->dev);
 267         if (IS_ERR_OR_NULL(tstamp->ptp)) {
 268                 mlx5_core_warn(priv->mdev, "ptp_clock_register failed %ld\n",
 269                                PTR_ERR(tstamp->ptp));
 270                 tstamp->ptp = NULL;
 271         }
 272 }
 273
 274 void mlx5e_timestamp_cleanup(struct mlx5e_priv *priv)
 275 {
 276         struct mlx5e_tstamp *tstamp = &priv->tstamp;
 277
 278         if (!MLX5_CAP_GEN(priv->mdev, device_frequency_khz))
 279                 return;
 280
 281         if (priv->tstamp.ptp) {
 282                 ptp_clock_unregister(priv->tstamp.ptp);
 283                 priv->tstamp.ptp = NULL;
 284         }
 285
 286         cancel_delayed_work_sync(&tstamp->overflow_work);
 287 }