Eran Ben Elisha | ef9814d | 2015-12-29 14:58:31 +0200 | [diff] [blame] | 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 | |
Eran Ben Elisha | 3d8c38a | 2015-12-29 14:58:32 +0200 | [diff] [blame^] | 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 | |
Eran Ben Elisha | ef9814d | 2015-12-29 14:58:31 +0200 | [diff] [blame] | 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"); |
Eran Ben Elisha | 3d8c38a | 2015-12-29 14:58:32 +0200 | [diff] [blame^] | 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 | } |
Eran Ben Elisha | ef9814d | 2015-12-29 14:58:31 +0200 | [diff] [blame] | 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 | |
Eran Ben Elisha | 3d8c38a | 2015-12-29 14:58:32 +0200 | [diff] [blame^] | 281 | if (priv->tstamp.ptp) { |
| 282 | ptp_clock_unregister(priv->tstamp.ptp); |
| 283 | priv->tstamp.ptp = NULL; |
| 284 | } |
| 285 | |
Eran Ben Elisha | ef9814d | 2015-12-29 14:58:31 +0200 | [diff] [blame] | 286 | cancel_delayed_work_sync(&tstamp->overflow_work); |
| 287 | } |