/**************************************************************************** * Driver for Solarflare network controllers and boards * Copyright 2011-2013 Solarflare Communications Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation, incorporated herein by reference. */ /* Theory of operation: * * PTP support is assisted by firmware running on the MC, which provides * the hardware timestamping capabilities. Both transmitted and received * PTP event packets are queued onto internal queues for subsequent processing; * this is because the MC operations are relatively long and would block * block NAPI/interrupt operation. * * Receive event processing: * The event contains the packet's UUID and sequence number, together * with the hardware timestamp. The PTP receive packet queue is searched * for this UUID/sequence number and, if found, put on a pending queue. * Packets not matching are delivered without timestamps (MCDI events will * always arrive after the actual packet). * It is important for the operation of the PTP protocol that the ordering * of packets between the event and general port is maintained. * * Work queue processing: * If work waiting, synchronise host/hardware time * * Transmit: send packet through MC, which returns the transmission time * that is converted to an appropriate timestamp. * * Receive: the packet's reception time is converted to an appropriate * timestamp. */ #include #include #include #include #include #include #include #include #include "net_driver.h" #include "efx.h" #include "mcdi.h" #include "mcdi_pcol.h" #include "io.h" #include "farch_regs.h" #include "nic.h" /* Maximum number of events expected to make up a PTP event */ #define MAX_EVENT_FRAGS 3 /* Maximum delay, ms, to begin synchronisation */ #define MAX_SYNCHRONISE_WAIT_MS 2 /* How long, at most, to spend synchronising */ #define SYNCHRONISE_PERIOD_NS 250000 /* How often to update the shared memory time */ #define SYNCHRONISATION_GRANULARITY_NS 200 /* Minimum permitted length of a (corrected) synchronisation time */ #define MIN_SYNCHRONISATION_NS 120 /* Maximum permitted length of a (corrected) synchronisation time */ #define MAX_SYNCHRONISATION_NS 1000 /* How many (MC) receive events that can be queued */ #define MAX_RECEIVE_EVENTS 8 /* Length of (modified) moving average. */ #define AVERAGE_LENGTH 16 /* How long an unmatched event or packet can be held */ #define PKT_EVENT_LIFETIME_MS 10 /* Offsets into PTP packet for identification. These offsets are from the * start of the IP header, not the MAC header. Note that neither PTP V1 nor * PTP V2 permit the use of IPV4 options. */ #define PTP_DPORT_OFFSET 22 #define PTP_V1_VERSION_LENGTH 2 #define PTP_V1_VERSION_OFFSET 28 #define PTP_V1_UUID_LENGTH 6 #define PTP_V1_UUID_OFFSET 50 #define PTP_V1_SEQUENCE_LENGTH 2 #define PTP_V1_SEQUENCE_OFFSET 58 /* The minimum length of a PTP V1 packet for offsets, etc. to be valid: * includes IP header. */ #define PTP_V1_MIN_LENGTH 64 #define PTP_V2_VERSION_LENGTH 1 #define PTP_V2_VERSION_OFFSET 29 #define PTP_V2_UUID_LENGTH 8 #define PTP_V2_UUID_OFFSET 48 /* Although PTP V2 UUIDs are comprised a ClockIdentity (8) and PortNumber (2), * the MC only captures the last six bytes of the clock identity. These values * reflect those, not the ones used in the standard. The standard permits * mapping of V1 UUIDs to V2 UUIDs with these same values. */ #define PTP_V2_MC_UUID_LENGTH 6 #define PTP_V2_MC_UUID_OFFSET 50 #define PTP_V2_SEQUENCE_LENGTH 2 #define PTP_V2_SEQUENCE_OFFSET 58 /* The minimum length of a PTP V2 packet for offsets, etc. to be valid: * includes IP header. */ #define PTP_V2_MIN_LENGTH 63 #define PTP_MIN_LENGTH 63 #define PTP_ADDRESS 0xe0000181 /* 224.0.1.129 */ #define PTP_EVENT_PORT 319 #define PTP_GENERAL_PORT 320 /* Annoyingly the format of the version numbers are different between * versions 1 and 2 so it isn't possible to simply look for 1 or 2. */ #define PTP_VERSION_V1 1 #define PTP_VERSION_V2 2 #define PTP_VERSION_V2_MASK 0x0f enum ptp_packet_state { PTP_PACKET_STATE_UNMATCHED = 0, PTP_PACKET_STATE_MATCHED, PTP_PACKET_STATE_TIMED_OUT, PTP_PACKET_STATE_MATCH_UNWANTED }; /* NIC synchronised with single word of time only comprising * partial seconds and full nanoseconds: 10^9 ~ 2^30 so 2 bits for seconds. */ #define MC_NANOSECOND_BITS 30 #define MC_NANOSECOND_MASK ((1 << MC_NANOSECOND_BITS) - 1) #define MC_SECOND_MASK ((1 << (32 - MC_NANOSECOND_BITS)) - 1) /* Maximum parts-per-billion adjustment that is acceptable */ #define MAX_PPB 1000000 /* Number of bits required to hold the above */ #define MAX_PPB_BITS 20 /* Number of extra bits allowed when calculating fractional ns. * EXTRA_BITS + MC_CMD_PTP_IN_ADJUST_BITS + MAX_PPB_BITS should * be less than 63. */ #define PPB_EXTRA_BITS 2 /* Precalculate scale word to avoid long long division at runtime */ #define PPB_SCALE_WORD ((1LL << (PPB_EXTRA_BITS + MC_CMD_PTP_IN_ADJUST_BITS +\ MAX_PPB_BITS)) / 1000000000LL) #define PTP_SYNC_ATTEMPTS 4 /** * struct efx_ptp_match - Matching structure, stored in sk_buff's cb area. * @words: UUID and (partial) sequence number * @expiry: Time after which the packet should be delivered irrespective of * event arrival. * @state: The state of the packet - whether it is ready for processing or * whether that is of no interest. */ struct efx_ptp_match { u32 words[DIV_ROUND_UP(PTP_V1_UUID_LENGTH, 4)]; unsigned long expiry; enum ptp_packet_state state; }; /** * struct efx_ptp_event_rx - A PTP receive event (from MC) * @seq0: First part of (PTP) UUID * @seq1: Second part of (PTP) UUID and sequence number * @hwtimestamp: Event timestamp */ struct efx_ptp_event_rx { struct list_head link; u32 seq0; u32 seq1; ktime_t hwtimestamp; unsigned long expiry; }; /** * struct efx_ptp_timeset - Synchronisation between host and MC * @host_start: Host time immediately before hardware timestamp taken * @seconds: Hardware timestamp, seconds * @nanoseconds: Hardware timestamp, nanoseconds * @host_end: Host time immediately after hardware timestamp taken * @waitns: Number of nanoseconds between hardware timestamp being read and * host end time being seen * @window: Difference of host_end and host_start * @valid: Whether this timeset is valid */ struct efx_ptp_timeset { u32 host_start; u32 seconds; u32 nanoseconds; u32 host_end; u32 waitns; u32 window; /* Derived: end - start, allowing for wrap */ }; /** * struct efx_ptp_data - Precision Time Protocol (PTP) state * @channel: The PTP channel * @rxq: Receive queue (awaiting timestamps) * @txq: Transmit queue * @evt_list: List of MC receive events awaiting packets * @evt_free_list: List of free events * @evt_lock: Lock for manipulating evt_list and evt_free_list * @rx_evts: Instantiated events (on evt_list and evt_free_list) * @workwq: Work queue for processing pending PTP operations * @work: Work task * @reset_required: A serious error has occurred and the PTP task needs to be * reset (disable, enable). * @rxfilter_event: Receive filter when operating * @rxfilter_general: Receive filter when operating * @config: Current timestamp configuration * @enabled: PTP operation enabled * @mode: Mode in which PTP operating (PTP version) * @evt_frags: Partly assembled PTP events * @evt_frag_idx: Current fragment number * @evt_code: Last event code * @start: Address at which MC indicates ready for synchronisation * @host_time_pps: Host time at last PPS * @last_sync_ns: Last number of nanoseconds between readings when synchronising * @base_sync_ns: Number of nanoseconds for last synchronisation. * @base_sync_valid: Whether base_sync_time is valid. * @current_adjfreq: Current ppb adjustment. * @phc_clock: Pointer to registered phc device * @phc_clock_info: Registration structure for phc device * @pps_work: pps work task for handling pps events * @pps_workwq: pps work queue * @nic_ts_enabled: Flag indicating if NIC generated TS events are handled * @txbuf: Buffer for use when transmitting (PTP) packets to MC (avoids * allocations in main data path). * @debug_ptp_dir: PTP debugfs directory * @missed_rx_sync: Number of packets received without syncrhonisation. * @good_syncs: Number of successful synchronisations. * @no_time_syncs: Number of synchronisations with no good times. * @bad_sync_durations: Number of synchronisations with bad durations. * @bad_syncs: Number of failed synchronisations. * @last_sync_time: Number of nanoseconds for last synchronisation. * @sync_timeouts: Number of synchronisation timeouts * @fast_syncs: Number of synchronisations requiring short delay * @min_sync_delta: Minimum time between event and synchronisation * @max_sync_delta: Maximum time between event and synchronisation * @average_sync_delta: Average time between event and synchronisation. * Modified moving average. * @last_sync_delta: Last time between event and synchronisation * @mc_stats: Context value for MC statistics * @timeset: Last set of synchronisation statistics. */ struct efx_ptp_data { struct efx_channel *channel; struct sk_buff_head rxq; struct sk_buff_head txq; struct list_head evt_list; struct list_head evt_free_list; spinlock_t evt_lock; struct efx_ptp_event_rx rx_evts[MAX_RECEIVE_EVENTS]; struct workqueue_struct *workwq; struct work_struct work; bool reset_required; u32 rxfilter_event; u32 rxfilter_general; bool rxfilter_installed; struct hwtstamp_config config; bool enabled; unsigned int mode; efx_qword_t evt_frags[MAX_EVENT_FRAGS]; int evt_frag_idx; int evt_code; struct efx_buffer start; struct pps_event_time host_time_pps; unsigned last_sync_ns; unsigned base_sync_ns; bool base_sync_valid; s64 current_adjfreq; struct ptp_clock *phc_clock; struct ptp_clock_info phc_clock_info; struct work_struct pps_work; struct workqueue_struct *pps_workwq; bool nic_ts_enabled; MCDI_DECLARE_BUF(txbuf, MC_CMD_PTP_IN_TRANSMIT_LENMAX); struct efx_ptp_timeset timeset[MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_MAXNUM]; }; static int efx_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta); static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta); static int efx_phc_gettime(struct ptp_clock_info *ptp, struct timespec *ts); static int efx_phc_settime(struct ptp_clock_info *ptp, const struct timespec *e_ts); static int efx_phc_enable(struct ptp_clock_info *ptp, struct ptp_clock_request *request, int on); /* Enable MCDI PTP support. */ static int efx_ptp_enable(struct efx_nic *efx) { MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_ENABLE_LEN); MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_ENABLE); MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0); MCDI_SET_DWORD(inbuf, PTP_IN_ENABLE_QUEUE, efx->ptp_data->channel->channel); MCDI_SET_DWORD(inbuf, PTP_IN_ENABLE_MODE, efx->ptp_data->mode); return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), NULL, 0, NULL); } /* Disable MCDI PTP support. * * Note that this function should never rely on the presence of ptp_data - * may be called before that exists. */ static int efx_ptp_disable(struct efx_nic *efx) { MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_DISABLE_LEN); MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_DISABLE); MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0); return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), NULL, 0, NULL); } static void efx_ptp_deliver_rx_queue(struct sk_buff_head *q) { struct sk_buff *skb; while ((skb = skb_dequeue(q))) { local_bh_disable(); netif_receive_skb(skb); local_bh_enable(); } } static void efx_ptp_handle_no_channel(struct efx_nic *efx) { netif_err(efx, drv, efx->net_dev, "ERROR: PTP requires MSI-X and 1 additional interrupt" "vector. PTP disabled\n"); } /* Repeatedly send the host time to the MC which will capture the hardware * time. */ static void efx_ptp_send_times(struct efx_nic *efx, struct pps_event_time *last_time) { struct pps_event_time now; struct timespec limit; struct efx_ptp_data *ptp = efx->ptp_data; struct timespec start; int *mc_running = ptp->start.addr; pps_get_ts(&now); start = now.ts_real; limit = now.ts_real; timespec_add_ns(&limit, SYNCHRONISE_PERIOD_NS); /* Write host time for specified period or until MC is done */ while ((timespec_compare(&now.ts_real, &limit) < 0) && ACCESS_ONCE(*mc_running)) { struct timespec update_time; unsigned int host_time; /* Don't update continuously to avoid saturating the PCIe bus */ update_time = now.ts_real; timespec_add_ns(&update_time, SYNCHRONISATION_GRANULARITY_NS); do { pps_get_ts(&now); } while ((timespec_compare(&now.ts_real, &update_time) < 0) && ACCESS_ONCE(*mc_running)); /* Synchronise NIC with single word of time only */ host_time = (now.ts_real.tv_sec << MC_NANOSECOND_BITS | now.ts_real.tv_nsec); /* Update host time in NIC memory */ efx->type->ptp_write_host_time(efx, host_time); } *last_time = now; } /* Read a timeset from the MC's results and partial process. */ static void efx_ptp_read_timeset(MCDI_DECLARE_STRUCT_PTR(data), struct efx_ptp_timeset *timeset) { unsigned start_ns, end_ns; timeset->host_start = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_HOSTSTART); timeset->seconds = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_SECONDS); timeset->nanoseconds = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_NANOSECONDS); timeset->host_end = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_HOSTEND), timeset->waitns = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_WAITNS); /* Ignore seconds */ start_ns = timeset->host_start & MC_NANOSECOND_MASK; end_ns = timeset->host_end & MC_NANOSECOND_MASK; /* Allow for rollover */ if (end_ns < start_ns) end_ns += NSEC_PER_SEC; /* Determine duration of operation */ timeset->window = end_ns - start_ns; } /* Process times received from MC. * * Extract times from returned results, and establish the minimum value * seen. The minimum value represents the "best" possible time and events * too much greater than this are rejected - the machine is, perhaps, too * busy. A number of readings are taken so that, hopefully, at least one good * synchronisation will be seen in the results. */ static int efx_ptp_process_times(struct efx_nic *efx, MCDI_DECLARE_STRUCT_PTR(synch_buf), size_t response_length, const struct pps_event_time *last_time) { unsigned number_readings = MCDI_VAR_ARRAY_LEN(response_length, PTP_OUT_SYNCHRONIZE_TIMESET); unsigned i; unsigned total; unsigned ngood = 0; unsigned last_good = 0; struct efx_ptp_data *ptp = efx->ptp_data; u32 last_sec; u32 start_sec; struct timespec delta; if (number_readings == 0) return -EAGAIN; /* Read the set of results and increment stats for any results that * appera to be erroneous. */ for (i = 0; i < number_readings; i++) { efx_ptp_read_timeset( MCDI_ARRAY_STRUCT_PTR(synch_buf, PTP_OUT_SYNCHRONIZE_TIMESET, i), &ptp->timeset[i]); } /* Find the last good host-MC synchronization result. The MC times * when it finishes reading the host time so the corrected window time * should be fairly constant for a given platform. */ total = 0; for (i = 0; i < number_readings; i++) if (ptp->timeset[i].window > ptp->timeset[i].waitns) { unsigned win; win = ptp->timeset[i].window - ptp->timeset[i].waitns; if (win >= MIN_SYNCHRONISATION_NS && win < MAX_SYNCHRONISATION_NS) { total += ptp->timeset[i].window; ngood++; last_good = i; } } if (ngood == 0) { netif_warn(efx, drv, efx->net_dev, "PTP no suitable synchronisations %dns\n", ptp->base_sync_ns); return -EAGAIN; } /* Average minimum this synchronisation */ ptp->last_sync_ns = DIV_ROUND_UP(total, ngood); if (!ptp->base_sync_valid || (ptp->last_sync_ns < ptp->base_sync_ns)) { ptp->base_sync_valid = true; ptp->base_sync_ns = ptp->last_sync_ns; } /* Calculate delay from actual PPS to last_time */ delta.tv_nsec = ptp->timeset[last_good].nanoseconds + last_time->ts_real.tv_nsec - (ptp->timeset[last_good].host_start & MC_NANOSECOND_MASK); /* It is possible that the seconds rolled over between taking * the start reading and the last value written by the host. The * timescales are such that a gap of more than one second is never * expected. */ start_sec = ptp->timeset[last_good].host_start >> MC_NANOSECOND_BITS; last_sec = last_time->ts_real.tv_sec & MC_SECOND_MASK; if (start_sec != last_sec) { if (((start_sec + 1) & MC_SECOND_MASK) != last_sec) { netif_warn(efx, hw, efx->net_dev, "PTP bad synchronisation seconds\n"); return -EAGAIN; } else { delta.tv_sec = 1; } } else { delta.tv_sec = 0; } ptp->host_time_pps = *last_time; pps_sub_ts(&ptp->host_time_pps, delta); return 0; } /* Synchronize times between the host and the MC */ static int efx_ptp_synchronize(struct efx_nic *efx, unsigned int num_readings) { struct efx_ptp_data *ptp = efx->ptp_data; MCDI_DECLARE_BUF(synch_buf, MC_CMD_PTP_OUT_SYNCHRONIZE_LENMAX); size_t response_length; int rc; unsigned long timeout; struct pps_event_time last_time = {}; unsigned int loops = 0; int *start = ptp->start.addr; MCDI_SET_DWORD(synch_buf, PTP_IN_OP, MC_CMD_PTP_OP_SYNCHRONIZE); MCDI_SET_DWORD(synch_buf, PTP_IN_PERIPH_ID, 0); MCDI_SET_DWORD(synch_buf, PTP_IN_SYNCHRONIZE_NUMTIMESETS, num_readings); MCDI_SET_QWORD(synch_buf, PTP_IN_SYNCHRONIZE_START_ADDR, ptp->start.dma_addr); /* Clear flag that signals MC ready */ ACCESS_ONCE(*start) = 0; rc = efx_mcdi_rpc_start(efx, MC_CMD_PTP, synch_buf, MC_CMD_PTP_IN_SYNCHRONIZE_LEN); EFX_BUG_ON_PARANOID(rc); /* Wait for start from MCDI (or timeout) */ timeout = jiffies + msecs_to_jiffies(MAX_SYNCHRONISE_WAIT_MS); while (!ACCESS_ONCE(*start) && (time_before(jiffies, timeout))) { udelay(20); /* Usually start MCDI execution quickly */ loops++; } if (ACCESS_ONCE(*start)) efx_ptp_send_times(efx, &last_time); /* Collect results */ rc = efx_mcdi_rpc_finish(efx, MC_CMD_PTP, MC_CMD_PTP_IN_SYNCHRONIZE_LEN, synch_buf, sizeof(synch_buf), &response_length); if (rc == 0) rc = efx_ptp_process_times(efx, synch_buf, response_length, &last_time); return rc; } /* Transmit a PTP packet, via the MCDI interface, to the wire. */ static int efx_ptp_xmit_skb(struct efx_nic *efx, struct sk_buff *skb) { struct efx_ptp_data *ptp_data = efx->ptp_data; struct skb_shared_hwtstamps timestamps; int rc = -EIO; MCDI_DECLARE_BUF(txtime, MC_CMD_PTP_OUT_TRANSMIT_LEN); size_t len; MCDI_SET_DWORD(ptp_data->txbuf, PTP_IN_OP, MC_CMD_PTP_OP_TRANSMIT); MCDI_SET_DWORD(ptp_data->txbuf, PTP_IN_PERIPH_ID, 0); MCDI_SET_DWORD(ptp_data->txbuf, PTP_IN_TRANSMIT_LENGTH, skb->len); if (skb_shinfo(skb)->nr_frags != 0) { rc = skb_linearize(skb); if (rc != 0) goto fail; } if (skb->ip_summed == CHECKSUM_PARTIAL) { rc = skb_checksum_help(skb); if (rc != 0) goto fail; } skb_copy_from_linear_data(skb, MCDI_PTR(ptp_data->txbuf, PTP_IN_TRANSMIT_PACKET), skb->len); rc = efx_mcdi_rpc(efx, MC_CMD_PTP, ptp_data->txbuf, MC_CMD_PTP_IN_TRANSMIT_LEN(skb->len), txtime, sizeof(txtime), &len); if (rc != 0) goto fail; memset(×tamps, 0, sizeof(timestamps)); timestamps.hwtstamp = ktime_set( MCDI_DWORD(txtime, PTP_OUT_TRANSMIT_SECONDS), MCDI_DWORD(txtime, PTP_OUT_TRANSMIT_NANOSECONDS)); skb_tstamp_tx(skb, ×tamps); rc = 0; fail: dev_kfree_skb(skb); return rc; } static void efx_ptp_drop_time_expired_events(struct efx_nic *efx) { struct efx_ptp_data *ptp = efx->ptp_data; struct list_head *cursor; struct list_head *next; /* Drop time-expired events */ spin_lock_bh(&ptp->evt_lock); if (!list_empty(&ptp->evt_list)) { list_for_each_safe(cursor, next, &ptp->evt_list) { struct efx_ptp_event_rx *evt; evt = list_entry(cursor, struct efx_ptp_event_rx, link); if (time_after(jiffies, evt->expiry)) { list_move(&evt->link, &ptp->evt_free_list); netif_warn(efx, hw, efx->net_dev, "PTP rx event dropped\n"); } } } spin_unlock_bh(&ptp->evt_lock); } static enum ptp_packet_state efx_ptp_match_rx(struct efx_nic *efx, struct sk_buff *skb) { struct efx_ptp_data *ptp = efx->ptp_data; bool evts_waiting; struct list_head *cursor; struct list_head *next; struct efx_ptp_match *match; enum ptp_packet_state rc = PTP_PACKET_STATE_UNMATCHED; spin_lock_bh(&ptp->evt_lock); evts_waiting = !list_empty(&ptp->evt_list); spin_unlock_bh(&ptp->evt_lock); if (!evts_waiting) return PTP_PACKET_STATE_UNMATCHED; match = (struct efx_ptp_match *)skb->cb; /* Look for a matching timestamp in the event queue */ spin_lock_bh(&ptp->evt_lock); list_for_each_safe(cursor, next, &ptp->evt_list) { struct efx_ptp_event_rx *evt; evt = list_entry(cursor, struct efx_ptp_event_rx, link); if ((evt->seq0 == match->words[0]) && (evt->seq1 == match->words[1])) { struct skb_shared_hwtstamps *timestamps; /* Match - add in hardware timestamp */ timestamps = skb_hwtstamps(skb); timestamps->hwtstamp = evt->hwtimestamp; match->state = PTP_PACKET_STATE_MATCHED; rc = PTP_PACKET_STATE_MATCHED; list_move(&evt->link, &ptp->evt_free_list); break; } } spin_unlock_bh(&ptp->evt_lock); return rc; } /* Process any queued receive events and corresponding packets * * q is returned with all the packets that are ready for delivery. * true is returned if at least one of those packets requires * synchronisation. */ static bool efx_ptp_process_events(struct efx_nic *efx, struct sk_buff_head *q) { struct efx_ptp_data *ptp = efx->ptp_data; bool rc = false; struct sk_buff *skb; while ((skb = skb_dequeue(&ptp->rxq))) { struct efx_ptp_match *match; match = (struct efx_ptp_match *)skb->cb; if (match->state == PTP_PACKET_STATE_MATCH_UNWANTED) { __skb_queue_tail(q, skb); } else if (efx_ptp_match_rx(efx, skb) == PTP_PACKET_STATE_MATCHED) { rc = true; __skb_queue_tail(q, skb); } else if (time_after(jiffies, match->expiry)) { match->state = PTP_PACKET_STATE_TIMED_OUT; netif_warn(efx, rx_err, efx->net_dev, "PTP packet - no timestamp seen\n"); __skb_queue_tail(q, skb); } else { /* Replace unprocessed entry and stop */ skb_queue_head(&ptp->rxq, skb); break; } } return rc; } /* Complete processing of a received packet */ static inline void efx_ptp_process_rx(struct efx_nic *efx, struct sk_buff *skb) { local_bh_disable(); netif_receive_skb(skb); local_bh_enable(); } static int efx_ptp_start(struct efx_nic *efx) { struct efx_ptp_data *ptp = efx->ptp_data; struct efx_filter_spec rxfilter; int rc; ptp->reset_required = false; /* Must filter on both event and general ports to ensure * that there is no packet re-ordering. */ efx_filter_init_rx(&rxfilter, EFX_FILTER_PRI_REQUIRED, 0, efx_rx_queue_index( efx_channel_get_rx_queue(ptp->channel))); rc = efx_filter_set_ipv4_local(&rxfilter, IPPROTO_UDP, htonl(PTP_ADDRESS), htons(PTP_EVENT_PORT)); if (rc != 0) return rc; rc = efx_filter_insert_filter(efx, &rxfilter, true); if (rc < 0) return rc; ptp->rxfilter_event = rc; efx_filter_init_rx(&rxfilter, EFX_FILTER_PRI_REQUIRED, 0, efx_rx_queue_index( efx_channel_get_rx_queue(ptp->channel))); rc = efx_filter_set_ipv4_local(&rxfilter, IPPROTO_UDP, htonl(PTP_ADDRESS), htons(PTP_GENERAL_PORT)); if (rc != 0) goto fail; rc = efx_filter_insert_filter(efx, &rxfilter, true); if (rc < 0) goto fail; ptp->rxfilter_general = rc; rc = efx_ptp_enable(efx); if (rc != 0) goto fail2; ptp->evt_frag_idx = 0; ptp->current_adjfreq = 0; ptp->rxfilter_installed = true; return 0; fail2: efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, ptp->rxfilter_general); fail: efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, ptp->rxfilter_event); return rc; } static int efx_ptp_stop(struct efx_nic *efx) { struct efx_ptp_data *ptp = efx->ptp_data; int rc = efx_ptp_disable(efx); struct list_head *cursor; struct list_head *next; if (ptp->rxfilter_installed) { efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, ptp->rxfilter_general); efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, ptp->rxfilter_event); ptp->rxfilter_installed = false; } /* Make sure RX packets are really delivered */ efx_ptp_deliver_rx_queue(&efx->ptp_data->rxq); skb_queue_purge(&efx->ptp_data->txq); /* Drop any pending receive events */ spin_lock_bh(&efx->ptp_data->evt_lock); list_for_each_safe(cursor, next, &efx->ptp_data->evt_list) { list_move(cursor, &efx->ptp_data->evt_free_list); } spin_unlock_bh(&efx->ptp_data->evt_lock); return rc; } static void efx_ptp_pps_worker(struct work_struct *work) { struct efx_ptp_data *ptp = container_of(work, struct efx_ptp_data, pps_work); struct efx_nic *efx = ptp->channel->efx; struct ptp_clock_event ptp_evt; if (efx_ptp_synchronize(efx, PTP_SYNC_ATTEMPTS)) return; ptp_evt.type = PTP_CLOCK_PPSUSR; ptp_evt.pps_times = ptp->host_time_pps; ptp_clock_event(ptp->phc_clock, &ptp_evt); } /* Process any pending transmissions and timestamp any received packets. */ static void efx_ptp_worker(struct work_struct *work) { struct efx_ptp_data *ptp_data = container_of(work, struct efx_ptp_data, work); struct efx_nic *efx = ptp_data->channel->efx; struct sk_buff *skb; struct sk_buff_head tempq; if (ptp_data->reset_required) { efx_ptp_stop(efx); efx_ptp_start(efx); return; } efx_ptp_drop_time_expired_events(efx); __skb_queue_head_init(&tempq); if (efx_ptp_process_events(efx, &tempq) || !skb_queue_empty(&ptp_data->txq)) { while ((skb = skb_dequeue(&ptp_data->txq))) efx_ptp_xmit_skb(efx, skb); } while ((skb = __skb_dequeue(&tempq))) efx_ptp_process_rx(efx, skb); } /* Initialise PTP channel and state. * * Setting core_index to zero causes the queue to be initialised and doesn't * overlap with 'rxq0' because ptp.c doesn't use skb_record_rx_queue. */ static int efx_ptp_probe_channel(struct efx_channel *channel) { struct efx_nic *efx = channel->efx; struct efx_ptp_data *ptp; int rc = 0; unsigned int pos; channel->irq_moderation = 0; channel->rx_queue.core_index = 0; ptp = kzalloc(sizeof(struct efx_ptp_data), GFP_KERNEL); efx->ptp_data = ptp; if (!efx->ptp_data) return -ENOMEM; rc = efx_nic_alloc_buffer(efx, &ptp->start, sizeof(int), GFP_KERNEL); if (rc != 0) goto fail1; ptp->channel = channel; skb_queue_head_init(&ptp->rxq); skb_queue_head_init(&ptp->txq); ptp->workwq = create_singlethread_workqueue("sfc_ptp"); if (!ptp->workwq) { rc = -ENOMEM; goto fail2; } INIT_WORK(&ptp->work, efx_ptp_worker); ptp->config.flags = 0; ptp->config.tx_type = HWTSTAMP_TX_OFF; ptp->config.rx_filter = HWTSTAMP_FILTER_NONE; INIT_LIST_HEAD(&ptp->evt_list); INIT_LIST_HEAD(&ptp->evt_free_list); spin_lock_init(&ptp->evt_lock); for (pos = 0; pos < MAX_RECEIVE_EVENTS; pos++) list_add(&ptp->rx_evts[pos].link, &ptp->evt_free_list); ptp->phc_clock_info.owner = THIS_MODULE; snprintf(ptp->phc_clock_info.name, sizeof(ptp->phc_clock_info.name), "%pm", efx->net_dev->perm_addr); ptp->phc_clock_info.max_adj = MAX_PPB; ptp->phc_clock_info.n_alarm = 0; ptp->phc_clock_info.n_ext_ts = 0; ptp->phc_clock_info.n_per_out = 0; ptp->phc_clock_info.pps = 1; ptp->phc_clock_info.adjfreq = efx_phc_adjfreq; ptp->phc_clock_info.adjtime = efx_phc_adjtime; ptp->phc_clock_info.gettime = efx_phc_gettime; ptp->phc_clock_info.settime = efx_phc_settime; ptp->phc_clock_info.enable = efx_phc_enable; ptp->phc_clock = ptp_clock_register(&ptp->phc_clock_info, &efx->pci_dev->dev); if (IS_ERR(ptp->phc_clock)) { rc = PTR_ERR(ptp->phc_clock); goto fail3; } INIT_WORK(&ptp->pps_work, efx_ptp_pps_worker); ptp->pps_workwq = create_singlethread_workqueue("sfc_pps"); if (!ptp->pps_workwq) { rc = -ENOMEM; goto fail4; } ptp->nic_ts_enabled = false; return 0; fail4: ptp_clock_unregister(efx->ptp_data->phc_clock); fail3: destroy_workqueue(efx->ptp_data->workwq); fail2: efx_nic_free_buffer(efx, &ptp->start); fail1: kfree(efx->ptp_data); efx->ptp_data = NULL; return rc; } static void efx_ptp_remove_channel(struct efx_channel *channel) { struct efx_nic *efx = channel->efx; if (!efx->ptp_data) return; (void)efx_ptp_disable(channel->efx); cancel_work_sync(&efx->ptp_data->work); cancel_work_sync(&efx->ptp_data->pps_work); skb_queue_purge(&efx->ptp_data->rxq); skb_queue_purge(&efx->ptp_data->txq); ptp_clock_unregister(efx->ptp_data->phc_clock); destroy_workqueue(efx->ptp_data->workwq); destroy_workqueue(efx->ptp_data->pps_workwq); efx_nic_free_buffer(efx, &efx->ptp_data->start); kfree(efx->ptp_data); } static void efx_ptp_get_channel_name(struct efx_channel *channel, char *buf, size_t len) { snprintf(buf, len, "%s-ptp", channel->efx->name); } /* Determine whether this packet should be processed by the PTP module * or transmitted conventionally. */ bool efx_ptp_is_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) { return efx->ptp_data && efx->ptp_data->enabled && skb->len >= PTP_MIN_LENGTH && skb->len <= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM && likely(skb->protocol == htons(ETH_P_IP)) && ip_hdr(skb)->protocol == IPPROTO_UDP && udp_hdr(skb)->dest == htons(PTP_EVENT_PORT); } /* Receive a PTP packet. Packets are queued until the arrival of * the receive timestamp from the MC - this will probably occur after the * packet arrival because of the processing in the MC. */ static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb) { struct efx_nic *efx = channel->efx; struct efx_ptp_data *ptp = efx->ptp_data; struct efx_ptp_match *match = (struct efx_ptp_match *)skb->cb; u8 *match_data_012, *match_data_345; unsigned int version; match->expiry = jiffies + msecs_to_jiffies(PKT_EVENT_LIFETIME_MS); /* Correct version? */ if (ptp->mode == MC_CMD_PTP_MODE_V1) { if (!pskb_may_pull(skb, PTP_V1_MIN_LENGTH)) { return false; } version = ntohs(*(__be16 *)&skb->data[PTP_V1_VERSION_OFFSET]); if (version != PTP_VERSION_V1) { return false; } /* PTP V1 uses all six bytes of the UUID to match the packet * to the timestamp */ match_data_012 = skb->data + PTP_V1_UUID_OFFSET; match_data_345 = skb->data + PTP_V1_UUID_OFFSET + 3; } else { if (!pskb_may_pull(skb, PTP_V2_MIN_LENGTH)) { return false; } version = skb->data[PTP_V2_VERSION_OFFSET]; if ((version & PTP_VERSION_V2_MASK) != PTP_VERSION_V2) { return false; } /* The original V2 implementation uses bytes 2-7 of * the UUID to match the packet to the timestamp. This * discards two of the bytes of the MAC address used * to create the UUID (SF bug 33070). The PTP V2 * enhanced mode fixes this issue and uses bytes 0-2 * and byte 5-7 of the UUID. */ match_data_345 = skb->data + PTP_V2_UUID_OFFSET + 5; if (ptp->mode == MC_CMD_PTP_MODE_V2) { match_data_012 = skb->data + PTP_V2_UUID_OFFSET + 2; } else { match_data_012 = skb->data + PTP_V2_UUID_OFFSET + 0; BUG_ON(ptp->mode != MC_CMD_PTP_MODE_V2_ENHANCED); } } /* Does this packet require timestamping? */ if (ntohs(*(__be16 *)&skb->data[PTP_DPORT_OFFSET]) == PTP_EVENT_PORT) { struct skb_shared_hwtstamps *timestamps; match->state = PTP_PACKET_STATE_UNMATCHED; /* Clear all timestamps held: filled in later */ timestamps = skb_hwtstamps(skb); memset(timestamps, 0, sizeof(*timestamps)); /* We expect the sequence number to be in the same position in * the packet for PTP V1 and V2 */ BUILD_BUG_ON(PTP_V1_SEQUENCE_OFFSET != PTP_V2_SEQUENCE_OFFSET); BUILD_BUG_ON(PTP_V1_SEQUENCE_LENGTH != PTP_V2_SEQUENCE_LENGTH); /* Extract UUID/Sequence information */ match->words[0] = (match_data_012[0] | (match_data_012[1] << 8) | (match_data_012[2] << 16) | (match_data_345[0] << 24)); match->words[1] = (match_data_345[1] | (match_data_345[2] << 8) | (skb->data[PTP_V1_SEQUENCE_OFFSET + PTP_V1_SEQUENCE_LENGTH - 1] << 16)); } else { match->state = PTP_PACKET_STATE_MATCH_UNWANTED; } skb_queue_tail(&ptp->rxq, skb); queue_work(ptp->workwq, &ptp->work); return true; } /* Transmit a PTP packet. This has to be transmitted by the MC * itself, through an MCDI call. MCDI calls aren't permitted * in the transmit path so defer the actual transmission to a suitable worker. */ int efx_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) { struct efx_ptp_data *ptp = efx->ptp_data; skb_queue_tail(&ptp->txq, skb); if ((udp_hdr(skb)->dest == htons(PTP_EVENT_PORT)) && (skb->len <= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM)) efx_xmit_hwtstamp_pending(skb); queue_work(ptp->workwq, &ptp->work); return NETDEV_TX_OK; } static int efx_ptp_change_mode(struct efx_nic *efx, bool enable_wanted, unsigned int new_mode) { if ((enable_wanted != efx->ptp_data->enabled) || (enable_wanted && (efx->ptp_data->mode != new_mode))) { int rc; if (enable_wanted) { /* Change of mode requires disable */ if (efx->ptp_data->enabled && (efx->ptp_data->mode != new_mode)) { efx->ptp_data->enabled = false; rc = efx_ptp_stop(efx); if (rc != 0) return rc; } /* Set new operating mode and establish * baseline synchronisation, which must * succeed. */ efx->ptp_data->mode = new_mode; rc = efx_ptp_start(efx); if (rc == 0) { rc = efx_ptp_synchronize(efx, PTP_SYNC_ATTEMPTS * 2); if (rc != 0) efx_ptp_stop(efx); } } else { rc = efx_ptp_stop(efx); } if (rc != 0) return rc; efx->ptp_data->enabled = enable_wanted; } return 0; } static int efx_ptp_ts_init(struct efx_nic *efx, struct hwtstamp_config *init) { bool enable_wanted = false; unsigned int new_mode; int rc; if (init->flags) return -EINVAL; if ((init->tx_type != HWTSTAMP_TX_OFF) && (init->tx_type != HWTSTAMP_TX_ON)) return -ERANGE; new_mode = efx->ptp_data->mode; /* Determine whether any PTP HW operations are required */ switch (init->rx_filter) { case HWTSTAMP_FILTER_NONE: break; case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: init->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT; new_mode = MC_CMD_PTP_MODE_V1; enable_wanted = true; break; case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: /* Although these three are accepted only IPV4 packets will be * timestamped */ init->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT; new_mode = MC_CMD_PTP_MODE_V2_ENHANCED; enable_wanted = true; break; case HWTSTAMP_FILTER_PTP_V2_EVENT: case HWTSTAMP_FILTER_PTP_V2_SYNC: case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: /* Non-IP + IPv6 timestamping not supported */ return -ERANGE; break; default: return -ERANGE; } if (init->tx_type != HWTSTAMP_TX_OFF) enable_wanted = true; /* Old versions of the firmware do not support the improved * UUID filtering option (SF bug 33070). If the firmware does * not accept the enhanced mode, fall back to the standard PTP * v2 UUID filtering. */ rc = efx_ptp_change_mode(efx, enable_wanted, new_mode); if ((rc != 0) && (new_mode == MC_CMD_PTP_MODE_V2_ENHANCED)) rc = efx_ptp_change_mode(efx, enable_wanted, MC_CMD_PTP_MODE_V2); if (rc != 0) return rc; efx->ptp_data->config = *init; return 0; } void efx_ptp_get_ts_info(struct efx_nic *efx, struct ethtool_ts_info *ts_info) { struct efx_ptp_data *ptp = efx->ptp_data; if (!ptp) return; ts_info->so_timestamping |= (SOF_TIMESTAMPING_TX_HARDWARE | SOF_TIMESTAMPING_RX_HARDWARE | SOF_TIMESTAMPING_RAW_HARDWARE); ts_info->phc_index = ptp_clock_index(ptp->phc_clock); ts_info->tx_types = 1 << HWTSTAMP_TX_OFF | 1 << HWTSTAMP_TX_ON; ts_info->rx_filters = (1 << HWTSTAMP_FILTER_NONE | 1 << HWTSTAMP_FILTER_PTP_V1_L4_EVENT | 1 << HWTSTAMP_FILTER_PTP_V1_L4_SYNC | 1 << HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ | 1 << HWTSTAMP_FILTER_PTP_V2_L4_EVENT | 1 << HWTSTAMP_FILTER_PTP_V2_L4_SYNC | 1 << HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ); } int efx_ptp_ioctl(struct efx_nic *efx, struct ifreq *ifr, int cmd) { struct hwtstamp_config config; int rc; /* Not a PTP enabled port */ if (!efx->ptp_data) return -EOPNOTSUPP; if (copy_from_user(&config, ifr->ifr_data, sizeof(config))) return -EFAULT; rc = efx_ptp_ts_init(efx, &config); if (rc != 0) return rc; return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ? -EFAULT : 0; } static void ptp_event_failure(struct efx_nic *efx, int expected_frag_len) { struct efx_ptp_data *ptp = efx->ptp_data; netif_err(efx, hw, efx->net_dev, "PTP unexpected event length: got %d expected %d\n", ptp->evt_frag_idx, expected_frag_len); ptp->reset_required = true; queue_work(ptp->workwq, &ptp->work); } /* Process a completed receive event. Put it on the event queue and * start worker thread. This is required because event and their * correspoding packets may come in either order. */ static void ptp_event_rx(struct efx_nic *efx, struct efx_ptp_data *ptp) { struct efx_ptp_event_rx *evt = NULL; if (ptp->evt_frag_idx != 3) { ptp_event_failure(efx, 3); return; } spin_lock_bh(&ptp->evt_lock); if (!list_empty(&ptp->evt_free_list)) { evt = list_first_entry(&ptp->evt_free_list, struct efx_ptp_event_rx, link); list_del(&evt->link); evt->seq0 = EFX_QWORD_FIELD(ptp->evt_frags[2], MCDI_EVENT_DATA); evt->seq1 = (EFX_QWORD_FIELD(ptp->evt_frags[2], MCDI_EVENT_SRC) | (EFX_QWORD_FIELD(ptp->evt_frags[1], MCDI_EVENT_SRC) << 8) | (EFX_QWORD_FIELD(ptp->evt_frags[0], MCDI_EVENT_SRC) << 16)); evt->hwtimestamp = ktime_set( EFX_QWORD_FIELD(ptp->evt_frags[0], MCDI_EVENT_DATA), EFX_QWORD_FIELD(ptp->evt_frags[1], MCDI_EVENT_DATA)); evt->expiry = jiffies + msecs_to_jiffies(PKT_EVENT_LIFETIME_MS); list_add_tail(&evt->link, &ptp->evt_list); queue_work(ptp->workwq, &ptp->work); } else { netif_err(efx, rx_err, efx->net_dev, "No free PTP event"); } spin_unlock_bh(&ptp->evt_lock); } static void ptp_event_fault(struct efx_nic *efx, struct efx_ptp_data *ptp) { int code = EFX_QWORD_FIELD(ptp->evt_frags[0], MCDI_EVENT_DATA); if (ptp->evt_frag_idx != 1) { ptp_event_failure(efx, 1); return; } netif_err(efx, hw, efx->net_dev, "PTP error %d\n", code); } static void ptp_event_pps(struct efx_nic *efx, struct efx_ptp_data *ptp) { if (ptp->nic_ts_enabled) queue_work(ptp->pps_workwq, &ptp->pps_work); } void efx_ptp_event(struct efx_nic *efx, efx_qword_t *ev) { struct efx_ptp_data *ptp = efx->ptp_data; int code = EFX_QWORD_FIELD(*ev, MCDI_EVENT_CODE); if (!ptp->enabled) return; if (ptp->evt_frag_idx == 0) { ptp->evt_code = code; } else if (ptp->evt_code != code) { netif_err(efx, hw, efx->net_dev, "PTP out of sequence event %d\n", code); ptp->evt_frag_idx = 0; } ptp->evt_frags[ptp->evt_frag_idx++] = *ev; if (!MCDI_EVENT_FIELD(*ev, CONT)) { /* Process resulting event */ switch (code) { case MCDI_EVENT_CODE_PTP_RX: ptp_event_rx(efx, ptp); break; case MCDI_EVENT_CODE_PTP_FAULT: ptp_event_fault(efx, ptp); break; case MCDI_EVENT_CODE_PTP_PPS: ptp_event_pps(efx, ptp); break; default: netif_err(efx, hw, efx->net_dev, "PTP unknown event %d\n", code); break; } ptp->evt_frag_idx = 0; } else if (MAX_EVENT_FRAGS == ptp->evt_frag_idx) { netif_err(efx, hw, efx->net_dev, "PTP too many event fragments\n"); ptp->evt_frag_idx = 0; } } static int efx_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta) { struct efx_ptp_data *ptp_data = container_of(ptp, struct efx_ptp_data, phc_clock_info); struct efx_nic *efx = ptp_data->channel->efx; MCDI_DECLARE_BUF(inadj, MC_CMD_PTP_IN_ADJUST_LEN); s64 adjustment_ns; int rc; if (delta > MAX_PPB) delta = MAX_PPB; else if (delta < -MAX_PPB) delta = -MAX_PPB; /* Convert ppb to fixed point ns. */ adjustment_ns = (((s64)delta * PPB_SCALE_WORD) >> (PPB_EXTRA_BITS + MAX_PPB_BITS)); MCDI_SET_DWORD(inadj, PTP_IN_OP, MC_CMD_PTP_OP_ADJUST); MCDI_SET_DWORD(inadj, PTP_IN_PERIPH_ID, 0); MCDI_SET_QWORD(inadj, PTP_IN_ADJUST_FREQ, adjustment_ns); MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_SECONDS, 0); MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_NANOSECONDS, 0); rc = efx_mcdi_rpc(efx, MC_CMD_PTP, inadj, sizeof(inadj), NULL, 0, NULL); if (rc != 0) return rc; ptp_data->current_adjfreq = delta; return 0; } static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta) { struct efx_ptp_data *ptp_data = container_of(ptp, struct efx_ptp_data, phc_clock_info); struct efx_nic *efx = ptp_data->channel->efx; struct timespec delta_ts = ns_to_timespec(delta); MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_ADJUST_LEN); MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_ADJUST); MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0); MCDI_SET_QWORD(inbuf, PTP_IN_ADJUST_FREQ, 0); MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_SECONDS, (u32)delta_ts.tv_sec); MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_NANOSECONDS, (u32)delta_ts.tv_nsec); return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), NULL, 0, NULL); } static int efx_phc_gettime(struct ptp_clock_info *ptp, struct timespec *ts) { struct efx_ptp_data *ptp_data = container_of(ptp, struct efx_ptp_data, phc_clock_info); struct efx_nic *efx = ptp_data->channel->efx; MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_READ_NIC_TIME_LEN); MCDI_DECLARE_BUF(outbuf, MC_CMD_PTP_OUT_READ_NIC_TIME_LEN); int rc; MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_READ_NIC_TIME); MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0); rc = efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), outbuf, sizeof(outbuf), NULL); if (rc != 0) return rc; ts->tv_sec = MCDI_DWORD(outbuf, PTP_OUT_READ_NIC_TIME_SECONDS); ts->tv_nsec = MCDI_DWORD(outbuf, PTP_OUT_READ_NIC_TIME_NANOSECONDS); return 0; } static int efx_phc_settime(struct ptp_clock_info *ptp, const struct timespec *e_ts) { /* Get the current NIC time, efx_phc_gettime. * Subtract from the desired time to get the offset * call efx_phc_adjtime with the offset */ int rc; struct timespec time_now; struct timespec delta; rc = efx_phc_gettime(ptp, &time_now); if (rc != 0) return rc; delta = timespec_sub(*e_ts, time_now); rc = efx_phc_adjtime(ptp, timespec_to_ns(&delta)); if (rc != 0) return rc; return 0; } static int efx_phc_enable(struct ptp_clock_info *ptp, struct ptp_clock_request *request, int enable) { struct efx_ptp_data *ptp_data = container_of(ptp, struct efx_ptp_data, phc_clock_info); if (request->type != PTP_CLK_REQ_PPS) return -EOPNOTSUPP; ptp_data->nic_ts_enabled = !!enable; return 0; } static const struct efx_channel_type efx_ptp_channel_type = { .handle_no_channel = efx_ptp_handle_no_channel, .pre_probe = efx_ptp_probe_channel, .post_remove = efx_ptp_remove_channel, .get_name = efx_ptp_get_channel_name, /* no copy operation; there is no need to reallocate this channel */ .receive_skb = efx_ptp_rx, .keep_eventq = false, }; void efx_ptp_probe(struct efx_nic *efx) { /* Check whether PTP is implemented on this NIC. The DISABLE * operation will succeed if and only if it is implemented. */ if (efx_ptp_disable(efx) == 0) efx->extra_channel_type[EFX_EXTRA_CHANNEL_PTP] = &efx_ptp_channel_type; }