Lines Matching full:ptp
9 * PTP support is assisted by firmware running on the MC, which provides
11 * PTP event packets are queued onto internal queues for subsequent processing;
17 * with the hardware timestamp. The PTP receive packet queue is searched
21 * It is important for the operation of the PTP protocol that the ordering
47 #include "nic.h" /* indirectly includes ptp.h */
50 /* Maximum number of events expected to make up a PTP event */
77 /* Offsets into PTP packet for identification. These offsets are from the
78 * start of the IP header, not the MAC header. Note that neither PTP V1 nor
79 * PTP V2 permit the use of IPV4 options.
92 /* The minimum length of a PTP V1 packet for offsets, etc. to be valid:
103 /* Although PTP V2 UUIDs are comprised a ClockIdentity (8) and PortNumber (2),
114 /* The minimum length of a PTP V2 packet for offsets, etc. to be valid:
181 * struct efx_ptp_event_rx - A PTP receive event (from MC)
183 * @seq0: First part of (PTP) UUID
184 * @seq1: Second part of (PTP) UUID and sequence number
217 * struct efx_ptp_data - Precision Time Protocol (PTP) state
219 * @channel: The PTP channel (Siena only)
228 * @workwq: Work queue for processing pending PTP operations
230 * @reset_required: A serious error has occurred and the PTP task needs to be
235 * @enabled: PTP operation enabled
236 * @mode: Mode in which PTP operating (PTP version)
252 * @ts_corrections.ptp_tx: Required driver correction of PTP packet transmit
254 * @ts_corrections.ptp_rx: Required driver correction of PTP packet receive
262 * @evt_frags: Partly assembled PTP events
275 * @txbuf: Buffer for use when transmitting (PTP) packets to MC (avoids
354 static int efx_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta);
355 static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta);
356 static int efx_phc_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts);
357 static int efx_phc_settime(struct ptp_clock_info *ptp,
359 static int efx_phc_enable(struct ptp_clock_info *ptp,
367 /* PTP 'extra' channel is still a traffic channel, but we only create TX queues
368 * if PTP uses MAC TX timestamps, not if PTP uses the MC directly to transmit.
569 struct efx_ptp_data *ptp, in efx_ptp_mac_nic_to_ktime_correction() argument
613 kt = ptp->nic_to_kernel_time(nic_major, nic_minor, in efx_ptp_mac_nic_to_ktime_correction()
622 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_nic_to_kernel_time() local
626 kt = efx_ptp_mac_nic_to_ktime_correction(efx, ptp, in efx_ptp_nic_to_kernel_time()
629 ptp->ts_corrections.general_tx); in efx_ptp_nic_to_kernel_time()
631 kt = ptp->nic_to_kernel_time( in efx_ptp_nic_to_kernel_time()
634 ptp->ts_corrections.general_tx); in efx_ptp_nic_to_kernel_time()
638 /* Get PTP attributes and set up time conversions */
643 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_get_attributes() local
648 /* Get the PTP attributes. If the NIC doesn't support the operation we in efx_ptp_get_attributes()
661 pci_info(efx->pci_dev, "no PTP support\n"); in efx_ptp_get_attributes()
671 ptp->ns_to_nic_time = efx_ptp_ns_to_s27; in efx_ptp_get_attributes()
672 ptp->nic_to_kernel_time = efx_ptp_s27_to_ktime_correction; in efx_ptp_get_attributes()
673 ptp->nic_time.minor_max = 1 << 27; in efx_ptp_get_attributes()
674 ptp->nic_time.sync_event_minor_shift = 19; in efx_ptp_get_attributes()
677 ptp->ns_to_nic_time = efx_ptp_ns_to_s_ns; in efx_ptp_get_attributes()
678 ptp->nic_to_kernel_time = efx_ptp_s_ns_to_ktime_correction; in efx_ptp_get_attributes()
679 ptp->nic_time.minor_max = 1000000000; in efx_ptp_get_attributes()
680 ptp->nic_time.sync_event_minor_shift = 22; in efx_ptp_get_attributes()
683 ptp->ns_to_nic_time = efx_ptp_ns_to_s_qns; in efx_ptp_get_attributes()
684 ptp->nic_to_kernel_time = efx_ptp_s_qns_to_ktime_correction; in efx_ptp_get_attributes()
685 ptp->nic_time.minor_max = 4000000000UL; in efx_ptp_get_attributes()
686 ptp->nic_time.sync_event_minor_shift = 24; in efx_ptp_get_attributes()
698 ptp->nic_time.sync_event_diff_min = ptp->nic_time.minor_max in efx_ptp_get_attributes()
699 - (ptp->nic_time.minor_max / 10); in efx_ptp_get_attributes()
700 ptp->nic_time.sync_event_diff_max = (ptp->nic_time.minor_max / 4) in efx_ptp_get_attributes()
701 + (ptp->nic_time.minor_max / 10); in efx_ptp_get_attributes()
712 ptp->min_synchronisation_ns = in efx_ptp_get_attributes()
716 ptp->min_synchronisation_ns = DEFAULT_MIN_SYNCHRONISATION_NS; in efx_ptp_get_attributes()
720 ptp->capabilities = MCDI_DWORD(outbuf, in efx_ptp_get_attributes()
723 ptp->capabilities = 0; in efx_ptp_get_attributes()
729 if (ptp->capabilities & (1 << MC_CMD_PTP_OUT_GET_ATTRIBUTES_FP44_FREQ_ADJ_LBN)) in efx_ptp_get_attributes()
730 ptp->adjfreq_ppb_shift = PPB_SHIFT_FP44; in efx_ptp_get_attributes()
732 ptp->adjfreq_ppb_shift = PPB_SHIFT_FP40; in efx_ptp_get_attributes()
737 /* Get PTP timestamp corrections */
793 /* Enable MCDI PTP support. */
817 /* Disable MCDI PTP support.
833 /* If we get ENOSYS, the NIC doesn't support PTP, and thus this function in efx_ptp_disable()
837 pci_info(efx->pci_dev, "no PTP support\n"); in efx_ptp_disable()
859 "ERROR: PTP requires MSI-X and 1 additional interrupt" in efx_ptp_handle_no_channel()
860 "vector. PTP disabled\n"); in efx_ptp_handle_no_channel()
871 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_send_times() local
872 int *mc_running = ptp->start.addr; in efx_ptp_send_times()
942 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_process_times() local
964 &ptp->timeset[i]); in efx_ptp_process_times()
967 ptp->nic_to_kernel_time(0, ptp->timeset[i].wait, 0)); in efx_ptp_process_times()
968 window = ptp->timeset[i].window; in efx_ptp_process_times()
981 ++ptp->invalid_sync_windows; in efx_ptp_process_times()
983 ++ptp->oversize_sync_windows; in efx_ptp_process_times()
984 } else if (corrected < ptp->min_synchronisation_ns) { in efx_ptp_process_times()
985 ++ptp->undersize_sync_windows; in efx_ptp_process_times()
994 "PTP no suitable synchronisations\n"); in efx_ptp_process_times()
1004 start_sec = ptp->timeset[last_good].host_start >> MC_NANOSECOND_BITS; in efx_ptp_process_times()
1009 "PTP bad synchronisation seconds\n"); in efx_ptp_process_times()
1015 (ptp->timeset[last_good].host_start & MC_NANOSECOND_MASK); in efx_ptp_process_times()
1021 mc_time = ptp->nic_to_kernel_time(ptp->timeset[last_good].major, in efx_ptp_process_times()
1022 ptp->timeset[last_good].minor, 0); in efx_ptp_process_times()
1028 ptp->host_time_pps = *last_time; in efx_ptp_process_times()
1029 pps_sub_ts(&ptp->host_time_pps, delta); in efx_ptp_process_times()
1037 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_synchronize() local
1044 int *start = ptp->start.addr; in efx_ptp_synchronize()
1051 ptp->start.dma_addr); in efx_ptp_synchronize()
1067 ++ptp->fast_syncs; in efx_ptp_synchronize()
1069 ++ptp->sync_timeouts; in efx_ptp_synchronize()
1083 ++ptp->good_syncs; in efx_ptp_synchronize()
1085 ++ptp->no_time_syncs; in efx_ptp_synchronize()
1092 ++ptp->bad_syncs; in efx_ptp_synchronize()
1097 /* Transmit a PTP packet via the dedicated hardware timestamped queue. */
1113 * Although it is theoretically safe for current PTP TX/RX code in efx_ptp_xmit_skb_queue()
1117 * 1) The code invoked is mainly implemented for non-PTP in efx_ptp_xmit_skb_queue()
1120 * 2) This being a single PTP packet, better to not in efx_ptp_xmit_skb_queue()
1130 WARN_ONCE(1, "PTP channel has no timestamped tx queue\n"); in efx_ptp_xmit_skb_queue()
1135 /* Transmit a PTP packet, via the MCDI interface, to the wire. */
1186 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_drop_time_expired_events() local
1190 if (ptp->rx_ts_inline) in efx_ptp_drop_time_expired_events()
1194 spin_lock_bh(&ptp->evt_lock); in efx_ptp_drop_time_expired_events()
1195 list_for_each_safe(cursor, next, &ptp->evt_list) { in efx_ptp_drop_time_expired_events()
1201 list_move(&evt->link, &ptp->evt_free_list); in efx_ptp_drop_time_expired_events()
1203 "PTP rx event dropped\n"); in efx_ptp_drop_time_expired_events()
1206 spin_unlock_bh(&ptp->evt_lock); in efx_ptp_drop_time_expired_events()
1212 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_match_rx() local
1219 WARN_ON_ONCE(ptp->rx_ts_inline); in efx_ptp_match_rx()
1221 spin_lock_bh(&ptp->evt_lock); in efx_ptp_match_rx()
1222 evts_waiting = !list_empty(&ptp->evt_list); in efx_ptp_match_rx()
1223 spin_unlock_bh(&ptp->evt_lock); in efx_ptp_match_rx()
1230 spin_lock_bh(&ptp->evt_lock); in efx_ptp_match_rx()
1231 list_for_each_safe(cursor, next, &ptp->evt_list) { in efx_ptp_match_rx()
1245 list_move(&evt->link, &ptp->evt_free_list); in efx_ptp_match_rx()
1249 spin_unlock_bh(&ptp->evt_lock); in efx_ptp_match_rx()
1260 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_process_events() local
1263 while ((skb = skb_dequeue(&ptp->rxq))) { in efx_ptp_process_events()
1274 ++ptp->rx_no_timestamp; in efx_ptp_process_events()
1278 skb_queue_head(&ptp->rxq, skb); in efx_ptp_process_events()
1294 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_remove_multicast_filters() local
1296 while (ptp->rxfilters_count) { in efx_ptp_remove_multicast_filters()
1297 ptp->rxfilters_count--; in efx_ptp_remove_multicast_filters()
1299 ptp->rxfilters[ptp->rxfilters_count]); in efx_ptp_remove_multicast_filters()
1316 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_insert_filter() local
1321 ptp->rxfilters[ptp->rxfilters_count] = rc; in efx_ptp_insert_filter()
1322 ptp->rxfilters_count++; in efx_ptp_insert_filter()
1360 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_insert_multicast_filters() local
1363 if (!ptp->channel || ptp->rxfilters_count) in efx_ptp_insert_multicast_filters()
1378 * PTP over IPv6 and Ethernet in efx_ptp_insert_multicast_filters()
1403 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_start() local
1406 ptp->reset_required = false; in efx_ptp_start()
1416 ptp->evt_frag_idx = 0; in efx_ptp_start()
1417 ptp->current_adjfreq = 0; in efx_ptp_start()
1428 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_stop() local
1433 if (ptp == NULL) in efx_ptp_stop()
1463 struct efx_ptp_data *ptp = in efx_ptp_pps_worker() local
1465 struct efx_nic *efx = ptp->efx; in efx_ptp_pps_worker()
1472 ptp_evt.pps_times = ptp->host_time_pps; in efx_ptp_pps_worker()
1473 ptp_clock_event(ptp->phc_clock, &ptp_evt); in efx_ptp_pps_worker()
1518 /* Initialise PTP state. */
1521 struct efx_ptp_data *ptp; in efx_ptp_probe() local
1530 ptp = kzalloc(sizeof(struct efx_ptp_data), GFP_KERNEL); in efx_ptp_probe()
1531 efx->ptp_data = ptp; in efx_ptp_probe()
1535 ptp->efx = efx; in efx_ptp_probe()
1536 ptp->channel = channel; in efx_ptp_probe()
1537 ptp->rx_ts_inline = efx_nic_rev(efx) >= EFX_REV_HUNT_A0; in efx_ptp_probe()
1539 rc = efx_nic_alloc_buffer(efx, &ptp->start, sizeof(int), GFP_KERNEL); in efx_ptp_probe()
1543 skb_queue_head_init(&ptp->rxq); in efx_ptp_probe()
1544 skb_queue_head_init(&ptp->txq); in efx_ptp_probe()
1545 ptp->workwq = create_singlethread_workqueue("sfc_ptp"); in efx_ptp_probe()
1546 if (!ptp->workwq) { in efx_ptp_probe()
1552 ptp->xmit_skb = efx_ptp_xmit_skb_queue; in efx_ptp_probe()
1556 ptp->xmit_skb = efx_ptp_xmit_skb_mc; in efx_ptp_probe()
1559 INIT_WORK(&ptp->work, efx_ptp_worker); in efx_ptp_probe()
1560 ptp->config.flags = 0; in efx_ptp_probe()
1561 ptp->config.tx_type = HWTSTAMP_TX_OFF; in efx_ptp_probe()
1562 ptp->config.rx_filter = HWTSTAMP_FILTER_NONE; in efx_ptp_probe()
1563 INIT_LIST_HEAD(&ptp->evt_list); in efx_ptp_probe()
1564 INIT_LIST_HEAD(&ptp->evt_free_list); in efx_ptp_probe()
1565 spin_lock_init(&ptp->evt_lock); in efx_ptp_probe()
1567 list_add(&ptp->rx_evts[pos].link, &ptp->evt_free_list); in efx_ptp_probe()
1569 /* Get the NIC PTP attributes and set up time conversions */ in efx_ptp_probe()
1581 ptp->phc_clock_info = efx_phc_clock_info; in efx_ptp_probe()
1582 ptp->phc_clock = ptp_clock_register(&ptp->phc_clock_info, in efx_ptp_probe()
1584 if (IS_ERR(ptp->phc_clock)) { in efx_ptp_probe()
1585 rc = PTR_ERR(ptp->phc_clock); in efx_ptp_probe()
1587 } else if (ptp->phc_clock) { in efx_ptp_probe()
1588 INIT_WORK(&ptp->pps_work, efx_ptp_pps_worker); in efx_ptp_probe()
1589 ptp->pps_workwq = create_singlethread_workqueue("sfc_pps"); in efx_ptp_probe()
1590 if (!ptp->pps_workwq) { in efx_ptp_probe()
1596 ptp->nic_ts_enabled = false; in efx_ptp_probe()
1606 efx_nic_free_buffer(efx, &ptp->start); in efx_ptp_probe()
1615 /* Initialise PTP channel.
1618 * overlap with 'rxq0' because ptp.c doesn't use skb_record_rx_queue.
1629 /* Failure to probe PTP is not fatal; this channel will just not be in efx_ptp_probe_channel()
1636 "Failed to probe PTP, rc=%d\n", rc); in efx_ptp_probe_channel()
1674 snprintf(buf, len, "%s-ptp", channel->efx->name); in efx_ptp_get_channel_name()
1677 /* Determine whether this packet should be processed by the PTP module
1695 /* Receive a PTP packet. Packets are queued until the arrival of
1702 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_rx() local
1711 if (ptp->mode == MC_CMD_PTP_MODE_V1) { in efx_ptp_rx()
1721 /* PTP V1 uses all six bytes of the UUID to match the packet in efx_ptp_rx()
1739 * to create the UUID (SF bug 33070). The PTP V2 in efx_ptp_rx()
1744 if (ptp->mode == MC_CMD_PTP_MODE_V2) { in efx_ptp_rx()
1748 BUG_ON(ptp->mode != MC_CMD_PTP_MODE_V2_ENHANCED); in efx_ptp_rx()
1757 * the packet for PTP V1 and V2 in efx_ptp_rx()
1776 skb_queue_tail(&ptp->rxq, skb); in efx_ptp_rx()
1777 queue_work(ptp->workwq, &ptp->work); in efx_ptp_rx()
1782 /* Transmit a PTP packet. This has to be transmitted by the MC
1788 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_tx() local
1790 skb_queue_tail(&ptp->txq, skb); in efx_ptp_tx()
1795 queue_work(ptp->workwq, &ptp->work); in efx_ptp_tx()
1866 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_get_ts_info() local
1871 if (!ptp) in efx_ptp_get_ts_info()
1892 ts_info->rx_filters = ptp->efx->type->hwtstamp_filters; in efx_ptp_get_ts_info()
1900 /* Not a PTP enabled port */ in efx_ptp_set_ts_config()
1926 struct efx_ptp_data *ptp = efx->ptp_data; in ptp_event_failure() local
1929 "PTP unexpected event length: got %d expected %d\n", in ptp_event_failure()
1930 ptp->evt_frag_idx, expected_frag_len); in ptp_event_failure()
1931 ptp->reset_required = true; in ptp_event_failure()
1932 queue_work(ptp->workwq, &ptp->work); in ptp_event_failure()
1939 static void ptp_event_rx(struct efx_nic *efx, struct efx_ptp_data *ptp) in ptp_event_rx() argument
1943 if (WARN_ON_ONCE(ptp->rx_ts_inline)) in ptp_event_rx()
1946 if (ptp->evt_frag_idx != 3) { in ptp_event_rx()
1951 spin_lock_bh(&ptp->evt_lock); in ptp_event_rx()
1952 if (!list_empty(&ptp->evt_free_list)) { in ptp_event_rx()
1953 evt = list_first_entry(&ptp->evt_free_list, in ptp_event_rx()
1957 evt->seq0 = EFX_QWORD_FIELD(ptp->evt_frags[2], MCDI_EVENT_DATA); in ptp_event_rx()
1958 evt->seq1 = (EFX_QWORD_FIELD(ptp->evt_frags[2], in ptp_event_rx()
1960 (EFX_QWORD_FIELD(ptp->evt_frags[1], in ptp_event_rx()
1962 (EFX_QWORD_FIELD(ptp->evt_frags[0], in ptp_event_rx()
1965 EFX_QWORD_FIELD(ptp->evt_frags[0], MCDI_EVENT_DATA), in ptp_event_rx()
1966 EFX_QWORD_FIELD(ptp->evt_frags[1], MCDI_EVENT_DATA), in ptp_event_rx()
1967 ptp->ts_corrections.ptp_rx); in ptp_event_rx()
1969 list_add_tail(&evt->link, &ptp->evt_list); in ptp_event_rx()
1971 queue_work(ptp->workwq, &ptp->work); in ptp_event_rx()
1974 netif_err(efx, rx_err, efx->net_dev, "PTP event queue overflow\n"); in ptp_event_rx()
1976 spin_unlock_bh(&ptp->evt_lock); in ptp_event_rx()
1979 static void ptp_event_fault(struct efx_nic *efx, struct efx_ptp_data *ptp) in ptp_event_fault() argument
1981 int code = EFX_QWORD_FIELD(ptp->evt_frags[0], MCDI_EVENT_DATA); in ptp_event_fault()
1982 if (ptp->evt_frag_idx != 1) { in ptp_event_fault()
1987 netif_err(efx, hw, efx->net_dev, "PTP error %d\n", code); in ptp_event_fault()
1990 static void ptp_event_pps(struct efx_nic *efx, struct efx_ptp_data *ptp) in ptp_event_pps() argument
1992 if (ptp->nic_ts_enabled) in ptp_event_pps()
1993 queue_work(ptp->pps_workwq, &ptp->pps_work); in ptp_event_pps()
1998 struct efx_ptp_data *ptp = efx->ptp_data; in efx_ptp_event() local
2001 if (!ptp) { in efx_ptp_event()
2004 "Received PTP event but PTP not set up\n"); in efx_ptp_event()
2010 if (!ptp->enabled) in efx_ptp_event()
2013 if (ptp->evt_frag_idx == 0) { in efx_ptp_event()
2014 ptp->evt_code = code; in efx_ptp_event()
2015 } else if (ptp->evt_code != code) { in efx_ptp_event()
2017 "PTP out of sequence event %d\n", code); in efx_ptp_event()
2018 ptp->evt_frag_idx = 0; in efx_ptp_event()
2021 ptp->evt_frags[ptp->evt_frag_idx++] = *ev; in efx_ptp_event()
2026 ptp_event_rx(efx, ptp); in efx_ptp_event()
2029 ptp_event_fault(efx, ptp); in efx_ptp_event()
2032 ptp_event_pps(efx, ptp); in efx_ptp_event()
2036 "PTP unknown event %d\n", code); in efx_ptp_event()
2039 ptp->evt_frag_idx = 0; in efx_ptp_event()
2040 } else if (MAX_EVENT_FRAGS == ptp->evt_frag_idx) { in efx_ptp_event()
2042 "PTP too many event fragments\n"); in efx_ptp_event()
2043 ptp->evt_frag_idx = 0; in efx_ptp_event()
2050 struct efx_ptp_data *ptp = efx->ptp_data; in efx_time_sync_event() local
2061 << ptp->nic_time.sync_event_minor_shift; in efx_time_sync_event()
2087 struct efx_ptp_data *ptp = efx->ptp_data; in __efx_rx_skb_attach_timestamp() local
2102 diff += ptp->nic_time.minor_max; in __efx_rx_skb_attach_timestamp()
2105 carry = (channel->sync_timestamp_minor >= ptp->nic_time.minor_max - diff) ? in __efx_rx_skb_attach_timestamp()
2108 if (diff <= ptp->nic_time.sync_event_diff_max) { in __efx_rx_skb_attach_timestamp()
2113 } else if (diff >= ptp->nic_time.sync_event_diff_min) { in __efx_rx_skb_attach_timestamp()
2135 ptp->nic_to_kernel_time(pkt_timestamp_major, in __efx_rx_skb_attach_timestamp()
2137 ptp->ts_corrections.general_rx); in __efx_rx_skb_attach_timestamp()
2140 static int efx_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta) in efx_phc_adjfreq() argument
2142 struct efx_ptp_data *ptp_data = container_of(ptp, in efx_phc_adjfreq()
2174 static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta) in efx_phc_adjtime() argument
2177 struct efx_ptp_data *ptp_data = container_of(ptp, in efx_phc_adjtime()
2194 static int efx_phc_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts) in efx_phc_gettime() argument
2196 struct efx_ptp_data *ptp_data = container_of(ptp, in efx_phc_gettime()
2220 static int efx_phc_settime(struct ptp_clock_info *ptp, in efx_phc_settime() argument
2231 rc = efx_phc_gettime(ptp, &time_now); in efx_phc_settime()
2237 rc = efx_phc_adjtime(ptp, timespec64_to_ns(&delta)); in efx_phc_settime()
2244 static int efx_phc_enable(struct ptp_clock_info *ptp, in efx_phc_enable() argument
2248 struct efx_ptp_data *ptp_data = container_of(ptp, in efx_phc_enable()
2271 /* Check whether PTP is implemented on this NIC. The DISABLE in efx_ptp_defer_probe_with_channel()
2282 netif_err(efx, drv, efx->net_dev, "Failed to restart PTP.\n"); in efx_ptp_start_datapath()