drivers/net/ethernet/qlogic/qede/qede_ptp.c

   1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
   2 /* QLogic qede NIC Driver
   3  * Copyright (c) 2015-2017  QLogic Corporation
   4  * Copyright (c) 2019-2020 Marvell International Ltd.
   5  */
   6
   7 #include "qede_ptp.h"
   8 #define QEDE_PTP_TX_TIMEOUT (2 * HZ)
   9
  10 struct qede_ptp {
  11         const struct qed_eth_ptp_ops    *ops;
  12         struct ptp_clock_info           clock_info;
  13         struct cyclecounter             cc;
  14         struct timecounter              tc;
  15         struct ptp_clock                *clock;
  16         struct work_struct              work;
  17         unsigned long                   ptp_tx_start;
  18         struct qede_dev                 *edev;
  19         struct sk_buff                  *tx_skb;
  20
  21         /* ptp spinlock is used for protecting the cycle/time counter fields
  22          * and, also for serializing the qed PTP API invocations.
  23          */
  24         spinlock_t                      lock;
  25         bool                            hw_ts_ioctl_called;
  26         u16                             tx_type;
  27         u16                             rx_filter;
  28 };
  29
  30 /**
  31  * qede_ptp_adjfreq() - Adjust the frequency of the PTP cycle counter.
  32  *
  33  * @info: The PTP clock info structure.
  34  * @ppb: Parts per billion adjustment from base.
  35  *
  36  * Return: Zero on success, negative errno otherwise.
  37  */
  38 static int qede_ptp_adjfreq(struct ptp_clock_info *info, s32 ppb)
  39 {
  40         struct qede_ptp *ptp = container_of(info, struct qede_ptp, clock_info);
  41         struct qede_dev *edev = ptp->edev;
  42         int rc;
  43
  44         __qede_lock(edev);
  45         if (edev->state == QEDE_STATE_OPEN) {
  46                 spin_lock_bh(&ptp->lock);
  47                 rc = ptp->ops->adjfreq(edev->cdev, ppb);
  48                 spin_unlock_bh(&ptp->lock);
  49         } else {
  50                 DP_ERR(edev, "PTP adjfreq called while interface is down\n");
  51                 rc = -EFAULT;
  52         }
  53         __qede_unlock(edev);
  54
  55         return rc;
  56 }
  57
  58 static int qede_ptp_adjtime(struct ptp_clock_info *info, s64 delta)
  59 {
  60         struct qede_dev *edev;
  61         struct qede_ptp *ptp;
  62
  63         ptp = container_of(info, struct qede_ptp, clock_info);
  64         edev = ptp->edev;
  65
  66         DP_VERBOSE(edev, QED_MSG_DEBUG, "PTP adjtime called, delta = %llx\n",
  67                    delta);
  68
  69         spin_lock_bh(&ptp->lock);
  70         timecounter_adjtime(&ptp->tc, delta);
  71         spin_unlock_bh(&ptp->lock);
  72
  73         return 0;
  74 }
  75
  76 static int qede_ptp_gettime(struct ptp_clock_info *info, struct timespec64 *ts)
  77 {
  78         struct qede_dev *edev;
  79         struct qede_ptp *ptp;
  80         u64 ns;
  81
  82         ptp = container_of(info, struct qede_ptp, clock_info);
  83         edev = ptp->edev;
  84
  85         spin_lock_bh(&ptp->lock);
  86         ns = timecounter_read(&ptp->tc);
  87         spin_unlock_bh(&ptp->lock);
  88
  89         DP_VERBOSE(edev, QED_MSG_DEBUG, "PTP gettime called, ns = %llu\n", ns);
  90
  91         *ts = ns_to_timespec64(ns);
  92
  93         return 0;
  94 }
  95
  96 static int qede_ptp_settime(struct ptp_clock_info *info,
  97                             const struct timespec64 *ts)
  98 {
  99         struct qede_dev *edev;
 100         struct qede_ptp *ptp;
 101         u64 ns;
 102
 103         ptp = container_of(info, struct qede_ptp, clock_info);
 104         edev = ptp->edev;
 105
 106         ns = timespec64_to_ns(ts);
 107
 108         DP_VERBOSE(edev, QED_MSG_DEBUG, "PTP settime called, ns = %llu\n", ns);
 109
 110         /* Re-init the timecounter */
 111         spin_lock_bh(&ptp->lock);
 112         timecounter_init(&ptp->tc, &ptp->cc, ns);
 113         spin_unlock_bh(&ptp->lock);
 114
 115         return 0;
 116 }
 117
 118 /* Enable (or disable) ancillary features of the phc subsystem */
 119 static int qede_ptp_ancillary_feature_enable(struct ptp_clock_info *info,
 120                                              struct ptp_clock_request *rq,
 121                                              int on)
 122 {
 123         struct qede_dev *edev;
 124         struct qede_ptp *ptp;
 125
 126         ptp = container_of(info, struct qede_ptp, clock_info);
 127         edev = ptp->edev;
 128
 129         DP_ERR(edev, "PHC ancillary features are not supported\n");
 130
 131         return -ENOTSUPP;
 132 }
 133
 134 static void qede_ptp_task(struct work_struct *work)
 135 {
 136         struct skb_shared_hwtstamps shhwtstamps;
 137         struct qede_dev *edev;
 138         struct qede_ptp *ptp;
 139         u64 timestamp, ns;
 140         bool timedout;
 141         int rc;
 142
 143         ptp = container_of(work, struct qede_ptp, work);
 144         edev = ptp->edev;
 145         timedout = time_is_before_jiffies(ptp->ptp_tx_start +
 146                                           QEDE_PTP_TX_TIMEOUT);
 147
 148         /* Read Tx timestamp registers */
 149         spin_lock_bh(&ptp->lock);
 150         rc = ptp->ops->read_tx_ts(edev->cdev, &timestamp);
 151         spin_unlock_bh(&ptp->lock);
 152         if (rc) {
 153                 if (unlikely(timedout)) {
 154                         DP_INFO(edev, "Tx timestamp is not recorded\n");
 155                         dev_kfree_skb_any(ptp->tx_skb);
 156                         ptp->tx_skb = NULL;
 157                         clear_bit_unlock(QEDE_FLAGS_PTP_TX_IN_PRORGESS,
 158                                          &edev->flags);
 159                         edev->ptp_skip_txts++;
 160                 } else {
 161                         /* Reschedule to keep checking for a valid TS value */
 162                         schedule_work(&ptp->work);
 163                 }
 164                 return;
 165         }
 166
 167         ns = timecounter_cyc2time(&ptp->tc, timestamp);
 168         memset(&shhwtstamps, 0, sizeof(shhwtstamps));
 169         shhwtstamps.hwtstamp = ns_to_ktime(ns);
 170         skb_tstamp_tx(ptp->tx_skb, &shhwtstamps);
 171         dev_kfree_skb_any(ptp->tx_skb);
 172         ptp->tx_skb = NULL;
 173         clear_bit_unlock(QEDE_FLAGS_PTP_TX_IN_PRORGESS, &edev->flags);
 174
 175         DP_VERBOSE(edev, QED_MSG_DEBUG,
 176                    "Tx timestamp, timestamp cycles = %llu, ns = %llu\n",
 177                    timestamp, ns);
 178 }
 179
 180 /* Read the PHC. This API is invoked with ptp_lock held. */
 181 static u64 qede_ptp_read_cc(const struct cyclecounter *cc)
 182 {
 183         struct qede_dev *edev;
 184         struct qede_ptp *ptp;
 185         u64 phc_cycles;
 186         int rc;
 187
 188         ptp = container_of(cc, struct qede_ptp, cc);
 189         edev = ptp->edev;
 190         rc = ptp->ops->read_cc(edev->cdev, &phc_cycles);
 191         if (rc)
 192                 WARN_ONCE(1, "PHC read err %d\n", rc);
 193
 194         DP_VERBOSE(edev, QED_MSG_DEBUG, "PHC read cycles = %llu\n", phc_cycles);
 195
 196         return phc_cycles;
 197 }
 198
 199 static int qede_ptp_cfg_filters(struct qede_dev *edev)
 200 {
 201         enum qed_ptp_hwtstamp_tx_type tx_type = QED_PTP_HWTSTAMP_TX_ON;
 202         enum qed_ptp_filter_type rx_filter = QED_PTP_FILTER_NONE;
 203         struct qede_ptp *ptp = edev->ptp;
 204
 205         if (!ptp)
 206                 return -EIO;
 207
 208         if (!ptp->hw_ts_ioctl_called) {
 209                 DP_INFO(edev, "TS IOCTL not called\n");
 210                 return 0;
 211         }
 212
 213         switch (ptp->tx_type) {
 214         case HWTSTAMP_TX_ON:
 215                 set_bit(QEDE_FLAGS_TX_TIMESTAMPING_EN, &edev->flags);
 216                 tx_type = QED_PTP_HWTSTAMP_TX_ON;
 217                 break;
 218
 219         case HWTSTAMP_TX_OFF:
 220                 clear_bit(QEDE_FLAGS_TX_TIMESTAMPING_EN, &edev->flags);
 221                 tx_type = QED_PTP_HWTSTAMP_TX_OFF;
 222                 break;
 223
 224         case HWTSTAMP_TX_ONESTEP_SYNC:
 225         case HWTSTAMP_TX_ONESTEP_P2P:
 226                 DP_ERR(edev, "One-step timestamping is not supported\n");
 227                 return -ERANGE;
 228         }
 229
 230         spin_lock_bh(&ptp->lock);
 231         switch (ptp->rx_filter) {
 232         case HWTSTAMP_FILTER_NONE:
 233                 rx_filter = QED_PTP_FILTER_NONE;
 234                 break;
 235         case HWTSTAMP_FILTER_ALL:
 236         case HWTSTAMP_FILTER_SOME:
 237         case HWTSTAMP_FILTER_NTP_ALL:
 238                 ptp->rx_filter = HWTSTAMP_FILTER_NONE;
 239                 rx_filter = QED_PTP_FILTER_ALL;
 240                 break;
 241         case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
 242                 ptp->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
 243                 rx_filter = QED_PTP_FILTER_V1_L4_EVENT;
 244                 break;
 245         case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
 246         case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
 247                 ptp->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
 248                 /* Initialize PTP detection for UDP/IPv4 events */
 249                 rx_filter = QED_PTP_FILTER_V1_L4_GEN;
 250                 break;
 251         case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
 252                 ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
 253                 rx_filter = QED_PTP_FILTER_V2_L4_EVENT;
 254                 break;
 255         case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
 256         case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
 257                 ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT;
 258                 /* Initialize PTP detection for UDP/IPv4 or UDP/IPv6 events */
 259                 rx_filter = QED_PTP_FILTER_V2_L4_GEN;
 260                 break;
 261         case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
 262                 ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
 263                 rx_filter = QED_PTP_FILTER_V2_L2_EVENT;
 264                 break;
 265         case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
 266         case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
 267                 ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
 268                 /* Initialize PTP detection L2 events */
 269                 rx_filter = QED_PTP_FILTER_V2_L2_GEN;
 270                 break;
 271         case HWTSTAMP_FILTER_PTP_V2_EVENT:
 272                 ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
 273                 rx_filter = QED_PTP_FILTER_V2_EVENT;
 274                 break;
 275         case HWTSTAMP_FILTER_PTP_V2_SYNC:
 276         case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
 277                 ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
 278                 /* Initialize PTP detection L2, UDP/IPv4 or UDP/IPv6 events */
 279                 rx_filter = QED_PTP_FILTER_V2_GEN;
 280                 break;
 281         }
 282
 283         ptp->ops->cfg_filters(edev->cdev, rx_filter, tx_type);
 284
 285         spin_unlock_bh(&ptp->lock);
 286
 287         return 0;
 288 }
 289
 290 int qede_ptp_hw_ts(struct qede_dev *edev, struct ifreq *ifr)
 291 {
 292         struct hwtstamp_config config;
 293         struct qede_ptp *ptp;
 294         int rc;
 295
 296         ptp = edev->ptp;
 297         if (!ptp)
 298                 return -EIO;
 299
 300         if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
 301                 return -EFAULT;
 302
 303         DP_VERBOSE(edev, QED_MSG_DEBUG,
 304                    "HWTSTAMP IOCTL: Requested tx_type = %d, requested rx_filters = %d\n",
 305                    config.tx_type, config.rx_filter);
 306
 307         if (config.flags) {
 308                 DP_ERR(edev, "config.flags is reserved for future use\n");
 309                 return -EINVAL;
 310         }
 311
 312         ptp->hw_ts_ioctl_called = 1;
 313         ptp->tx_type = config.tx_type;
 314         ptp->rx_filter = config.rx_filter;
 315
 316         rc = qede_ptp_cfg_filters(edev);
 317         if (rc)
 318                 return rc;
 319
 320         config.rx_filter = ptp->rx_filter;
 321
 322         return copy_to_user(ifr->ifr_data, &config,
 323                             sizeof(config)) ? -EFAULT : 0;
 324 }
 325
 326 int qede_ptp_get_ts_info(struct qede_dev *edev, struct ethtool_ts_info *info)
 327 {
 328         struct qede_ptp *ptp = edev->ptp;
 329
 330         if (!ptp) {
 331                 info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
 332                                         SOF_TIMESTAMPING_RX_SOFTWARE |
 333                                         SOF_TIMESTAMPING_SOFTWARE;
 334                 info->phc_index = -1;
 335
 336                 return 0;
 337         }
 338
 339         info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
 340                                 SOF_TIMESTAMPING_RX_SOFTWARE |
 341                                 SOF_TIMESTAMPING_SOFTWARE |
 342                                 SOF_TIMESTAMPING_TX_HARDWARE |
 343                                 SOF_TIMESTAMPING_RX_HARDWARE |
 344                                 SOF_TIMESTAMPING_RAW_HARDWARE;
 345
 346         if (ptp->clock)
 347                 info->phc_index = ptp_clock_index(ptp->clock);
 348         else
 349                 info->phc_index = -1;
 350
 351         info->rx_filters = BIT(HWTSTAMP_FILTER_NONE) |
 352                            BIT(HWTSTAMP_FILTER_PTP_V1_L4_EVENT) |
 353                            BIT(HWTSTAMP_FILTER_PTP_V1_L4_SYNC) |
 354                            BIT(HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ) |
 355                            BIT(HWTSTAMP_FILTER_PTP_V2_L4_EVENT) |
 356                            BIT(HWTSTAMP_FILTER_PTP_V2_L4_SYNC) |
 357                            BIT(HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ) |
 358                            BIT(HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
 359                            BIT(HWTSTAMP_FILTER_PTP_V2_L2_SYNC) |
 360                            BIT(HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ) |
 361                            BIT(HWTSTAMP_FILTER_PTP_V2_EVENT) |
 362                            BIT(HWTSTAMP_FILTER_PTP_V2_SYNC) |
 363                            BIT(HWTSTAMP_FILTER_PTP_V2_DELAY_REQ);
 364
 365         info->tx_types = BIT(HWTSTAMP_TX_OFF) | BIT(HWTSTAMP_TX_ON);
 366
 367         return 0;
 368 }
 369
 370 void qede_ptp_disable(struct qede_dev *edev)
 371 {
 372         struct qede_ptp *ptp;
 373
 374         ptp = edev->ptp;
 375         if (!ptp)
 376                 return;
 377
 378         if (ptp->clock) {
 379                 ptp_clock_unregister(ptp->clock);
 380                 ptp->clock = NULL;
 381         }
 382
 383         /* Cancel PTP work queue. Should be done after the Tx queues are
 384          * drained to prevent additional scheduling.
 385          */
 386         cancel_work_sync(&ptp->work);
 387         if (ptp->tx_skb) {
 388                 dev_kfree_skb_any(ptp->tx_skb);
 389                 ptp->tx_skb = NULL;
 390                 clear_bit_unlock(QEDE_FLAGS_PTP_TX_IN_PRORGESS, &edev->flags);
 391         }
 392
 393         /* Disable PTP in HW */
 394         spin_lock_bh(&ptp->lock);
 395         ptp->ops->disable(edev->cdev);
 396         spin_unlock_bh(&ptp->lock);
 397
 398         kfree(ptp);
 399         edev->ptp = NULL;
 400 }
 401
 402 static int qede_ptp_init(struct qede_dev *edev)
 403 {
 404         struct qede_ptp *ptp;
 405         int rc;
 406
 407         ptp = edev->ptp;
 408         if (!ptp)
 409                 return -EINVAL;
 410
 411         spin_lock_init(&ptp->lock);
 412
 413         /* Configure PTP in HW */
 414         rc = ptp->ops->enable(edev->cdev);
 415         if (rc) {
 416                 DP_INFO(edev, "PTP HW enable failed\n");
 417                 return rc;
 418         }
 419
 420         /* Init work queue for Tx timestamping */
 421         INIT_WORK(&ptp->work, qede_ptp_task);
 422
 423         /* Init cyclecounter and timecounter */
 424         memset(&ptp->cc, 0, sizeof(ptp->cc));
 425         ptp->cc.read = qede_ptp_read_cc;
 426         ptp->cc.mask = CYCLECOUNTER_MASK(64);
 427         ptp->cc.shift = 0;
 428         ptp->cc.mult = 1;
 429
 430         timecounter_init(&ptp->tc, &ptp->cc, ktime_to_ns(ktime_get_real()));
 431
 432         return 0;
 433 }
 434
 435 int qede_ptp_enable(struct qede_dev *edev)
 436 {
 437         struct qede_ptp *ptp;
 438         int rc;
 439
 440         ptp = kzalloc(sizeof(*ptp), GFP_KERNEL);
 441         if (!ptp) {
 442                 DP_INFO(edev, "Failed to allocate struct for PTP\n");
 443                 return -ENOMEM;
 444         }
 445
 446         ptp->edev = edev;
 447         ptp->ops = edev->ops->ptp;
 448         if (!ptp->ops) {
 449                 DP_INFO(edev, "PTP enable failed\n");
 450                 rc = -EIO;
 451                 goto err1;
 452         }
 453
 454         edev->ptp = ptp;
 455
 456         rc = qede_ptp_init(edev);
 457         if (rc)
 458                 goto err1;
 459
 460         qede_ptp_cfg_filters(edev);
 461
 462         /* Fill the ptp_clock_info struct and register PTP clock */
 463         ptp->clock_info.owner = THIS_MODULE;
 464         snprintf(ptp->clock_info.name, 16, "%s", edev->ndev->name);
 465         ptp->clock_info.max_adj = QED_MAX_PHC_DRIFT_PPB;
 466         ptp->clock_info.n_alarm = 0;
 467         ptp->clock_info.n_ext_ts = 0;
 468         ptp->clock_info.n_per_out = 0;
 469         ptp->clock_info.pps = 0;
 470         ptp->clock_info.adjfreq = qede_ptp_adjfreq;
 471         ptp->clock_info.adjtime = qede_ptp_adjtime;
 472         ptp->clock_info.gettime64 = qede_ptp_gettime;
 473         ptp->clock_info.settime64 = qede_ptp_settime;
 474         ptp->clock_info.enable = qede_ptp_ancillary_feature_enable;
 475
 476         ptp->clock = ptp_clock_register(&ptp->clock_info, &edev->pdev->dev);
 477         if (IS_ERR(ptp->clock)) {
 478                 DP_ERR(edev, "PTP clock registration failed\n");
 479                 qede_ptp_disable(edev);
 480                 rc = -EINVAL;
 481                 goto err2;
 482         }
 483
 484         return 0;
 485
 486 err1:
 487         kfree(ptp);
 488 err2:
 489         edev->ptp = NULL;
 490
 491         return rc;
 492 }
 493
 494 void qede_ptp_tx_ts(struct qede_dev *edev, struct sk_buff *skb)
 495 {
 496         struct qede_ptp *ptp;
 497
 498         ptp = edev->ptp;
 499         if (!ptp)
 500                 return;
 501
 502         if (test_and_set_bit_lock(QEDE_FLAGS_PTP_TX_IN_PRORGESS,
 503                                   &edev->flags)) {
 504                 DP_ERR(edev, "Timestamping in progress\n");
 505                 edev->ptp_skip_txts++;
 506                 return;
 507         }
 508
 509         if (unlikely(!test_bit(QEDE_FLAGS_TX_TIMESTAMPING_EN, &edev->flags))) {
 510                 DP_ERR(edev,
 511                        "Tx timestamping was not enabled, this packet will not be timestamped\n");
 512                 clear_bit_unlock(QEDE_FLAGS_PTP_TX_IN_PRORGESS, &edev->flags);
 513                 edev->ptp_skip_txts++;
 514         } else if (unlikely(ptp->tx_skb)) {
 515                 DP_ERR(edev,
 516                        "The device supports only a single outstanding packet to timestamp, this packet will not be timestamped\n");
 517                 clear_bit_unlock(QEDE_FLAGS_PTP_TX_IN_PRORGESS, &edev->flags);
 518                 edev->ptp_skip_txts++;
 519         } else {
 520                 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
 521                 /* schedule check for Tx timestamp */
 522                 ptp->tx_skb = skb_get(skb);
 523                 ptp->ptp_tx_start = jiffies;
 524                 schedule_work(&ptp->work);
 525         }
 526 }
 527
 528 void qede_ptp_rx_ts(struct qede_dev *edev, struct sk_buff *skb)
 529 {
 530         struct qede_ptp *ptp;
 531         u64 timestamp, ns;
 532         int rc;
 533
 534         ptp = edev->ptp;
 535         if (!ptp)
 536                 return;
 537
 538         spin_lock_bh(&ptp->lock);
 539         rc = ptp->ops->read_rx_ts(edev->cdev, &timestamp);
 540         if (rc) {
 541                 spin_unlock_bh(&ptp->lock);
 542                 DP_INFO(edev, "Invalid Rx timestamp\n");
 543                 return;
 544         }
 545
 546         ns = timecounter_cyc2time(&ptp->tc, timestamp);
 547         spin_unlock_bh(&ptp->lock);
 548         skb_hwtstamps(skb)->hwtstamp = ns_to_ktime(ns);
 549         DP_VERBOSE(edev, QED_MSG_DEBUG,
 550                    "Rx timestamp, timestamp cycles = %llu, ns = %llu\n",
 551                    timestamp, ns);
 552 }