--- /dev/null
+/****************************************************************************
+ * 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 <linux/ip.h>
+#include <linux/udp.h>
+#include <linux/time.h>
+#include <linux/ktime.h>
+#include <linux/module.h>
+#include <linux/net_tstamp.h>
+#include <linux/pps_kernel.h>
+#include <linux/ptp_clock_kernel.h>
+#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 DEFAULT_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
+ * @major: Hardware timestamp, major
+ * @minor: Hardware timestamp, minor
+ * @host_end: Host time immediately after hardware timestamp taken
+ * @wait: Number of NIC clock ticks 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 major;
+ u32 minor;
+ u32 host_end;
+ u32 wait;
+ u32 window; /* Derived: end - start, allowing for wrap */
+};
+
+/**
+ * struct efx_ptp_data - Precision Time Protocol (PTP) state
+ * @efx: The NIC context
+ * @channel: The PTP channel (Siena only)
+ * @rx_ts_inline: Flag for whether RX timestamps are inline (else they are
+ * separate events)
+ * @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)
+ * @time_format: Time format supported by this NIC
+ * @ns_to_nic_time: Function to convert from scalar nanoseconds to NIC time
+ * @nic_to_kernel_time: Function to convert from NIC to kernel time
+ * @min_synchronisation_ns: Minimum acceptable corrected sync window
+ * @ts_corrections.tx: Required driver correction of transmit timestamps
+ * @ts_corrections.rx: Required driver correction of receive timestamps
+ * @ts_corrections.pps_out: PPS output error (information only)
+ * @ts_corrections.pps_in: Required driver correction of PPS input timestamps
+ * @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
+ * @current_adjfreq: Current ppb adjustment.
+ * @phc_clock: Pointer to registered phc device (if primary function)
+ * @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).
+ * @good_syncs: Number of successful synchronisations.
+ * @fast_syncs: Number of synchronisations requiring short delay
+ * @bad_syncs: Number of failed synchronisations.
+ * @sync_timeouts: Number of synchronisation timeouts
+ * @no_time_syncs: Number of synchronisations with no good times.
+ * @invalid_sync_windows: Number of sync windows with bad durations.
+ * @undersize_sync_windows: Number of corrected sync windows that are too small
+ * @oversize_sync_windows: Number of corrected sync windows that are too large
+ * @rx_no_timestamp: Number of packets received without a timestamp.
+ * @timeset: Last set of synchronisation statistics.
+ */
+struct efx_ptp_data {
+ struct efx_nic *efx;
+ struct efx_channel *channel;
+ bool rx_ts_inline;
+ 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;
+ unsigned int time_format;
+ void (*ns_to_nic_time)(s64 ns, u32 *nic_major, u32 *nic_minor);
+ ktime_t (*nic_to_kernel_time)(u32 nic_major, u32 nic_minor,
+ s32 correction);
+ unsigned int min_synchronisation_ns;
+ struct {
+ s32 tx;
+ s32 rx;
+ s32 pps_out;
+ s32 pps_in;
+ } ts_corrections;
+ 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;
+ 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);
+
+ unsigned int good_syncs;
+ unsigned int fast_syncs;
+ unsigned int bad_syncs;
+ unsigned int sync_timeouts;
+ unsigned int no_time_syncs;
+ unsigned int invalid_sync_windows;
+ unsigned int undersize_sync_windows;
+ unsigned int oversize_sync_windows;
+ unsigned int rx_no_timestamp;
+ 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 timespec64 *ts);
+static int efx_phc_settime(struct ptp_clock_info *ptp,
+ const struct timespec64 *e_ts);
+static int efx_phc_enable(struct ptp_clock_info *ptp,
+ struct ptp_clock_request *request, int on);
+
+#define PTP_SW_STAT(ext_name, field_name) \
+ { #ext_name, 0, offsetof(struct efx_ptp_data, field_name) }
+#define PTP_MC_STAT(ext_name, mcdi_name) \
+ { #ext_name, 32, MC_CMD_PTP_OUT_STATUS_STATS_ ## mcdi_name ## _OFST }
+static const struct efx_hw_stat_desc efx_ptp_stat_desc[] = {
+ PTP_SW_STAT(ptp_good_syncs, good_syncs),
+ PTP_SW_STAT(ptp_fast_syncs, fast_syncs),
+ PTP_SW_STAT(ptp_bad_syncs, bad_syncs),
+ PTP_SW_STAT(ptp_sync_timeouts, sync_timeouts),
+ PTP_SW_STAT(ptp_no_time_syncs, no_time_syncs),
+ PTP_SW_STAT(ptp_invalid_sync_windows, invalid_sync_windows),
+ PTP_SW_STAT(ptp_undersize_sync_windows, undersize_sync_windows),
+ PTP_SW_STAT(ptp_oversize_sync_windows, oversize_sync_windows),
+ PTP_SW_STAT(ptp_rx_no_timestamp, rx_no_timestamp),
+ PTP_MC_STAT(ptp_tx_timestamp_packets, TX),
+ PTP_MC_STAT(ptp_rx_timestamp_packets, RX),
+ PTP_MC_STAT(ptp_timestamp_packets, TS),
+ PTP_MC_STAT(ptp_filter_matches, FM),
+ PTP_MC_STAT(ptp_non_filter_matches, NFM),
+};
+#define PTP_STAT_COUNT ARRAY_SIZE(efx_ptp_stat_desc)
+static const unsigned long efx_ptp_stat_mask[] = {
+ [0 ... BITS_TO_LONGS(PTP_STAT_COUNT) - 1] = ~0UL,
+};
+
+size_t efx_ptp_describe_stats(struct efx_nic *efx, u8 *strings)
+{
+ if (!efx->ptp_data)
+ return 0;
+
+ return efx_nic_describe_stats(efx_ptp_stat_desc, PTP_STAT_COUNT,
+ efx_ptp_stat_mask, strings);
+}
+
+size_t efx_ptp_update_stats(struct efx_nic *efx, u64 *stats)
+{
+ MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_STATUS_LEN);
+ MCDI_DECLARE_BUF(outbuf, MC_CMD_PTP_OUT_STATUS_LEN);
+ size_t i;
+ int rc;
+
+ if (!efx->ptp_data)
+ return 0;
+
+ /* Copy software statistics */
+ for (i = 0; i < PTP_STAT_COUNT; i++) {
+ if (efx_ptp_stat_desc[i].dma_width)
+ continue;
+ stats[i] = *(unsigned int *)((char *)efx->ptp_data +
+ efx_ptp_stat_desc[i].offset);
+ }
+
+ /* Fetch MC statistics. We *must* fill in all statistics or
+ * risk leaking kernel memory to userland, so if the MCDI
+ * request fails we pretend we got zeroes.
+ */
+ MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_STATUS);
+ 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) {
+ netif_err(efx, hw, efx->net_dev,
+ "MC_CMD_PTP_OP_STATUS failed (%d)\n", rc);
+ memset(outbuf, 0, sizeof(outbuf));
+ }
+ efx_nic_update_stats(efx_ptp_stat_desc, PTP_STAT_COUNT,
+ efx_ptp_stat_mask,
+ stats, _MCDI_PTR(outbuf, 0), false);
+
+ return PTP_STAT_COUNT;
+}
+
+/* For Siena platforms NIC time is s and ns */
+static void efx_ptp_ns_to_s_ns(s64 ns, u32 *nic_major, u32 *nic_minor)
+{
+ struct timespec ts = ns_to_timespec(ns);
+ *nic_major = ts.tv_sec;
+ *nic_minor = ts.tv_nsec;
+}
+
+static ktime_t efx_ptp_s_ns_to_ktime_correction(u32 nic_major, u32 nic_minor,
+ s32 correction)
+{
+ ktime_t kt = ktime_set(nic_major, nic_minor);
+ if (correction >= 0)
+ kt = ktime_add_ns(kt, (u64)correction);
+ else
+ kt = ktime_sub_ns(kt, (u64)-correction);
+ return kt;
+}
+
+/* To convert from s27 format to ns we multiply then divide by a power of 2.
+ * For the conversion from ns to s27, the operation is also converted to a
+ * multiply and shift.
+ */
+#define S27_TO_NS_SHIFT (27)
+#define NS_TO_S27_MULT (((1ULL << 63) + NSEC_PER_SEC / 2) / NSEC_PER_SEC)
+#define NS_TO_S27_SHIFT (63 - S27_TO_NS_SHIFT)
+#define S27_MINOR_MAX (1 << S27_TO_NS_SHIFT)
+
+/* For Huntington platforms NIC time is in seconds and fractions of a second
+ * where the minor register only uses 27 bits in units of 2^-27s.
+ */
+static void efx_ptp_ns_to_s27(s64 ns, u32 *nic_major, u32 *nic_minor)
+{
+ struct timespec ts = ns_to_timespec(ns);
+ u32 maj = ts.tv_sec;
+ u32 min = (u32)(((u64)ts.tv_nsec * NS_TO_S27_MULT +
+ (1ULL << (NS_TO_S27_SHIFT - 1))) >> NS_TO_S27_SHIFT);
+
+ /* The conversion can result in the minor value exceeding the maximum.
+ * In this case, round up to the next second.
+ */
+ if (min >= S27_MINOR_MAX) {
+ min -= S27_MINOR_MAX;
+ maj++;
+ }
+
+ *nic_major = maj;
+ *nic_minor = min;
+}
+
+static inline ktime_t efx_ptp_s27_to_ktime(u32 nic_major, u32 nic_minor)
+{
+ u32 ns = (u32)(((u64)nic_minor * NSEC_PER_SEC +
+ (1ULL << (S27_TO_NS_SHIFT - 1))) >> S27_TO_NS_SHIFT);
+ return ktime_set(nic_major, ns);
+}
+
+static ktime_t efx_ptp_s27_to_ktime_correction(u32 nic_major, u32 nic_minor,
+ s32 correction)
+{
+ /* Apply the correction and deal with carry */
+ nic_minor += correction;
+ if ((s32)nic_minor < 0) {
+ nic_minor += S27_MINOR_MAX;
+ nic_major--;
+ } else if (nic_minor >= S27_MINOR_MAX) {
+ nic_minor -= S27_MINOR_MAX;
+ nic_major++;
+ }
+
+ return efx_ptp_s27_to_ktime(nic_major, nic_minor);
+}
+
+/* Get PTP attributes and set up time conversions */
+static int efx_ptp_get_attributes(struct efx_nic *efx)
+{
+ MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_GET_ATTRIBUTES_LEN);
+ MCDI_DECLARE_BUF(outbuf, MC_CMD_PTP_OUT_GET_ATTRIBUTES_LEN);
+ struct efx_ptp_data *ptp = efx->ptp_data;
+ int rc;
+ u32 fmt;
+ size_t out_len;
+
+ /* Get the PTP attributes. If the NIC doesn't support the operation we
+ * use the default format for compatibility with older NICs i.e.
+ * seconds and nanoseconds.
+ */
+ MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_GET_ATTRIBUTES);
+ MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0);
+ rc = efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf),
+ outbuf, sizeof(outbuf), &out_len);
+ if (rc == 0)
+ fmt = MCDI_DWORD(outbuf, PTP_OUT_GET_ATTRIBUTES_TIME_FORMAT);
+ else if (rc == -EINVAL)
+ fmt = MC_CMD_PTP_OUT_GET_ATTRIBUTES_SECONDS_NANOSECONDS;
+ else
+ return rc;
+
+ if (fmt == MC_CMD_PTP_OUT_GET_ATTRIBUTES_SECONDS_27FRACTION) {
+ ptp->ns_to_nic_time = efx_ptp_ns_to_s27;
+ ptp->nic_to_kernel_time = efx_ptp_s27_to_ktime_correction;
+ } else if (fmt == MC_CMD_PTP_OUT_GET_ATTRIBUTES_SECONDS_NANOSECONDS) {
+ ptp->ns_to_nic_time = efx_ptp_ns_to_s_ns;
+ ptp->nic_to_kernel_time = efx_ptp_s_ns_to_ktime_correction;
+ } else {
+ return -ERANGE;
+ }
+
+ ptp->time_format = fmt;
+
+ /* MC_CMD_PTP_OP_GET_ATTRIBUTES is an extended version of an older
+ * operation MC_CMD_PTP_OP_GET_TIME_FORMAT that also returns a value
+ * to use for the minimum acceptable corrected synchronization window.
+ * If we have the extra information store it. For older firmware that
+ * does not implement the extended command use the default value.
+ */
+ if (rc == 0 && out_len >= MC_CMD_PTP_OUT_GET_ATTRIBUTES_LEN)
+ ptp->min_synchronisation_ns =
+ MCDI_DWORD(outbuf,
+ PTP_OUT_GET_ATTRIBUTES_SYNC_WINDOW_MIN);
+ else
+ ptp->min_synchronisation_ns = DEFAULT_MIN_SYNCHRONISATION_NS;
+
+ return 0;
+}
+
+/* Get PTP timestamp corrections */
+static int efx_ptp_get_timestamp_corrections(struct efx_nic *efx)
+{
+ MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_GET_TIMESTAMP_CORRECTIONS_LEN);
+ MCDI_DECLARE_BUF(outbuf, MC_CMD_PTP_OUT_GET_TIMESTAMP_CORRECTIONS_LEN);
+ int rc;
+
+ /* Get the timestamp corrections from the NIC. If this operation is
+ * not supported (older NICs) then no correction is required.
+ */
+ MCDI_SET_DWORD(inbuf, PTP_IN_OP,
+ MC_CMD_PTP_OP_GET_TIMESTAMP_CORRECTIONS);
+ 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) {
+ efx->ptp_data->ts_corrections.tx = MCDI_DWORD(outbuf,
+ PTP_OUT_GET_TIMESTAMP_CORRECTIONS_TRANSMIT);
+ efx->ptp_data->ts_corrections.rx = MCDI_DWORD(outbuf,
+ PTP_OUT_GET_TIMESTAMP_CORRECTIONS_RECEIVE);
+ efx->ptp_data->ts_corrections.pps_out = MCDI_DWORD(outbuf,
+ PTP_OUT_GET_TIMESTAMP_CORRECTIONS_PPS_OUT);
+ efx->ptp_data->ts_corrections.pps_in = MCDI_DWORD(outbuf,
+ PTP_OUT_GET_TIMESTAMP_CORRECTIONS_PPS_IN);
+ } else if (rc == -EINVAL) {
+ efx->ptp_data->ts_corrections.tx = 0;
+ efx->ptp_data->ts_corrections.rx = 0;
+ efx->ptp_data->ts_corrections.pps_out = 0;
+ efx->ptp_data->ts_corrections.pps_in = 0;
+ } else {
+ return rc;
+ }
+
+ return 0;
+}
+
+/* Enable MCDI PTP support. */
+static int efx_ptp_enable(struct efx_nic *efx)
+{
+ MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_ENABLE_LEN);
+ MCDI_DECLARE_BUF_OUT_OR_ERR(outbuf, 0);
+ int rc;
+
+ 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 ?
+ efx->ptp_data->channel->channel : 0);
+ MCDI_SET_DWORD(inbuf, PTP_IN_ENABLE_MODE, efx->ptp_data->mode);
+
+ rc = efx_mcdi_rpc_quiet(efx, MC_CMD_PTP, inbuf, sizeof(inbuf),
+ outbuf, sizeof(outbuf), NULL);
+ rc = (rc == -EALREADY) ? 0 : rc;
+ if (rc)
+ efx_mcdi_display_error(efx, MC_CMD_PTP,
+ MC_CMD_PTP_IN_ENABLE_LEN,
+ outbuf, sizeof(outbuf), rc);
+ return rc;
+}
+
+/* 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_DECLARE_BUF_OUT_OR_ERR(outbuf, 0);
+ int rc;
+
+ MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_DISABLE);
+ MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0);
+ rc = efx_mcdi_rpc_quiet(efx, MC_CMD_PTP, inbuf, sizeof(inbuf),
+ outbuf, sizeof(outbuf), NULL);
+ rc = (rc == -EALREADY) ? 0 : rc;
+ if (rc)
+ efx_mcdi_display_error(efx, MC_CMD_PTP,
+ MC_CMD_PTP_IN_DISABLE_LEN,
+ outbuf, sizeof(outbuf), rc);
+ return rc;
+}
+
+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->major = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_MAJOR);
+ timeset->minor = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_MINOR);
+ timeset->host_end = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_HOSTEND),
+ timeset->wait = 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 ngood = 0;
+ unsigned last_good = 0;
+ struct efx_ptp_data *ptp = efx->ptp_data;
+ u32 last_sec;
+ u32 start_sec;
+ struct timespec delta;
+ ktime_t mc_time;
+
+ if (number_readings == 0)
+ return -EAGAIN;
+
+ /* Read the set of results and 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. Increment stats for any results that appear
+ * to be erroneous.
+ */
+ for (i = 0; i < number_readings; i++) {
+ s32 window, corrected;
+ struct timespec wait;
+
+ efx_ptp_read_timeset(
+ MCDI_ARRAY_STRUCT_PTR(synch_buf,
+ PTP_OUT_SYNCHRONIZE_TIMESET, i),
+ &ptp->timeset[i]);
+
+ wait = ktime_to_timespec(
+ ptp->nic_to_kernel_time(0, ptp->timeset[i].wait, 0));
+ window = ptp->timeset[i].window;
+ corrected = window - wait.tv_nsec;
+
+ /* We expect the uncorrected synchronization window to be at
+ * least as large as the interval between host start and end
+ * times. If it is smaller than this then this is mostly likely
+ * to be a consequence of the host's time being adjusted.
+ * Check that the corrected sync window is in a reasonable
+ * range. If it is out of range it is likely to be because an
+ * interrupt or other delay occurred between reading the system
+ * time and writing it to MC memory.
+ */
+ if (window < SYNCHRONISATION_GRANULARITY_NS) {
+ ++ptp->invalid_sync_windows;
+ } else if (corrected >= MAX_SYNCHRONISATION_NS) {
+ ++ptp->oversize_sync_windows;
+ } else if (corrected < ptp->min_synchronisation_ns) {
+ ++ptp->undersize_sync_windows;
+ } else {
+ ngood++;
+ last_good = i;
+ }
+ }
+
+ if (ngood == 0) {
+ netif_warn(efx, drv, efx->net_dev,
+ "PTP no suitable synchronisations\n");
+ return -EAGAIN;
+ }
+
+ /* Calculate delay from last good sync (host time) to last_time.
+ * 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. delta is *not* normalised.
+ */
+ 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 &&
+ ((start_sec + 1) & MC_SECOND_MASK) != last_sec) {
+ netif_warn(efx, hw, efx->net_dev,
+ "PTP bad synchronisation seconds\n");
+ return -EAGAIN;
+ }
+ delta.tv_sec = (last_sec - start_sec) & 1;
+ delta.tv_nsec =
+ last_time->ts_real.tv_nsec -
+ (ptp->timeset[last_good].host_start & MC_NANOSECOND_MASK);
+
+ /* Convert the NIC time at last good sync into kernel time.
+ * No correction is required - this time is the output of a
+ * firmware process.
+ */
+ mc_time = ptp->nic_to_kernel_time(ptp->timeset[last_good].major,
+ ptp->timeset[last_good].minor, 0);
+
+ /* Calculate delay from NIC top of second to last_time */
+ delta.tv_nsec += ktime_to_timespec(mc_time).tv_nsec;
+
+ /* Set PPS timestamp to match NIC top of second */
+ 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 (loops <= 1)
+ ++ptp->fast_syncs;
+ if (!time_before(jiffies, timeout))
+ ++ptp->sync_timeouts;
+
+ 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);
+ if (rc == 0)
+ ++ptp->good_syncs;
+ else
+ ++ptp->no_time_syncs;
+ }
+
+ /* Increment the bad syncs counter if the synchronize fails, whatever
+ * the reason.
+ */
+ if (rc != 0)
+ ++ptp->bad_syncs;
+
+ 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 = ptp_data->nic_to_kernel_time(
+ MCDI_DWORD(txtime, PTP_OUT_TRANSMIT_MAJOR),
+ MCDI_DWORD(txtime, PTP_OUT_TRANSMIT_MINOR),
+ ptp_data->ts_corrections.tx);
+
+ 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;
+
+ if (ptp->rx_ts_inline)
+ return;
+
+ /* 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;
+
+ WARN_ON_ONCE(ptp->rx_ts_inline);
+
+ 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.
+ */
+static void efx_ptp_process_events(struct efx_nic *efx, struct sk_buff_head *q)
+{
+ struct efx_ptp_data *ptp = efx->ptp_data;
+ 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) {
+ __skb_queue_tail(q, skb);
+ } else if (time_after(jiffies, match->expiry)) {
+ match->state = PTP_PACKET_STATE_TIMED_OUT;
+ ++ptp->rx_no_timestamp;
+ __skb_queue_tail(q, skb);
+ } else {
+ /* Replace unprocessed entry and stop */
+ skb_queue_head(&ptp->rxq, skb);
+ break;
+ }
+ }
+}
+
+/* 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 void efx_ptp_remove_multicast_filters(struct efx_nic *efx)
+{
+ struct efx_ptp_data *ptp = efx->ptp_data;
+
+ 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;
+ }
+}
+
+static int efx_ptp_insert_multicast_filters(struct efx_nic *efx)
+{
+ struct efx_ptp_data *ptp = efx->ptp_data;
+ struct efx_filter_spec rxfilter;
+ int rc;
+
+ if (!ptp->channel || ptp->rxfilter_installed)
+ return 0;
+
+ /* 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;
+
+ ptp->rxfilter_installed = true;
+ return 0;
+
+fail:
+ efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED,
+ ptp->rxfilter_event);
+ return rc;
+}
+
+static int efx_ptp_start(struct efx_nic *efx)
+{
+ struct efx_ptp_data *ptp = efx->ptp_data;
+ int rc;
+
+ ptp->reset_required = false;
+
+ rc = efx_ptp_insert_multicast_filters(efx);
+ if (rc)
+ return rc;
+
+ rc = efx_ptp_enable(efx);
+ if (rc != 0)
+ goto fail;
+
+ ptp->evt_frag_idx = 0;
+ ptp->current_adjfreq = 0;
+
+ return 0;
+
+fail:
+ efx_ptp_remove_multicast_filters(efx);
+ return rc;
+}
+
+static int efx_ptp_stop(struct efx_nic *efx)
+{
+ struct efx_ptp_data *ptp = efx->ptp_data;
+ struct list_head *cursor;
+ struct list_head *next;
+ int rc;
+
+ if (ptp == NULL)
+ return 0;
+
+ rc = efx_ptp_disable(efx);
+
+ efx_ptp_remove_multicast_filters(efx);
+
+ /* 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 int efx_ptp_restart(struct efx_nic *efx)
+{
+ if (efx->ptp_data && efx->ptp_data->enabled)
+ return efx_ptp_start(efx);
+ return 0;
+}
+
+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->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);
+}
+
+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->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);
+ efx_ptp_process_events(efx, &tempq);
+
+ while ((skb = skb_dequeue(&ptp_data->txq)))
+ efx_ptp_xmit_skb(efx, skb);
+
+ while ((skb = __skb_dequeue(&tempq)))
+ efx_ptp_process_rx(efx, skb);
+}
+
+static const struct ptp_clock_info efx_phc_clock_info = {
+ .owner = THIS_MODULE,
+ .name = "sfc",
+ .max_adj = MAX_PPB,
+ .n_alarm = 0,
+ .n_ext_ts = 0,
+ .n_per_out = 0,
+ .n_pins = 0,
+ .pps = 1,
+ .adjfreq = efx_phc_adjfreq,
+ .adjtime = efx_phc_adjtime,
+ .gettime64 = efx_phc_gettime,
+ .settime64 = efx_phc_settime,
+ .enable = efx_phc_enable,
+};
+
+/* Initialise PTP state. */
+int efx_ptp_probe(struct efx_nic *efx, struct efx_channel *channel)
+{
+ struct efx_ptp_data *ptp;
+ int rc = 0;
+ unsigned int pos;
+
+ ptp = kzalloc(sizeof(struct efx_ptp_data), GFP_KERNEL);
+ efx->ptp_data = ptp;
+ if (!efx->ptp_data)
+ return -ENOMEM;
+
+ ptp->efx = efx;
+ ptp->channel = channel;
+ ptp->rx_ts_inline = efx_nic_rev(efx) >= EFX_REV_HUNT_A0;
+
+ rc = efx_nic_alloc_buffer(efx, &ptp->start, sizeof(int), GFP_KERNEL);
+ if (rc != 0)
+ goto fail1;
+
+ 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);
+
+ /* Get the NIC PTP attributes and set up time conversions */
+ rc = efx_ptp_get_attributes(efx);
+ if (rc < 0)
+ goto fail3;
+
+ /* Get the timestamp corrections */
+ rc = efx_ptp_get_timestamp_corrections(efx);
+ if (rc < 0)
+ goto fail3;
+
+ if (efx->mcdi->fn_flags &
+ (1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_PRIMARY)) {
+ ptp->phc_clock_info = efx_phc_clock_info;
+ 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;
+}
+
+/* Initialise PTP channel.
+ *
+ * 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;
+
+ channel->irq_moderation = 0;
+ channel->rx_queue.core_index = 0;
+
+ return efx_ptp_probe(efx, channel);
+}
+
+void efx_ptp_remove(struct efx_nic *efx)
+{
+ if (!efx->ptp_data)
+ return;
+
+ (void)efx_ptp_disable(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);
+
+ if (efx->ptp_data->phc_clock) {
+ destroy_workqueue(efx->ptp_data->pps_workwq);
+ ptp_clock_unregister(efx->ptp_data->phc_clock);
+ }
+
+ destroy_workqueue(efx->ptp_data->workwq);
+
+ efx_nic_free_buffer(efx, &efx->ptp_data->start);
+ kfree(efx->ptp_data);
+}
+
+static void efx_ptp_remove_channel(struct efx_channel *channel)
+{
+ efx_ptp_remove(channel->efx);
+}
+
+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)) &&
+ skb_transport_header_was_set(skb) &&
+ skb_network_header_len(skb) >= sizeof(struct iphdr) &&
+ ip_hdr(skb)->protocol == IPPROTO_UDP &&
+ skb_headlen(skb) >=
+ skb_transport_offset(skb) + sizeof(struct udphdr) &&
+ 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;
+ u8 *data;
+
+ 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;
+ }
+ data = skb->data;
+ version = ntohs(*(__be16 *)&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 = data + PTP_V1_UUID_OFFSET;
+ match_data_345 = data + PTP_V1_UUID_OFFSET + 3;
+ } else {
+ if (!pskb_may_pull(skb, PTP_V2_MIN_LENGTH)) {
+ return false;
+ }
+ data = skb->data;
+ version = 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 = data + PTP_V2_UUID_OFFSET + 5;
+ if (ptp->mode == MC_CMD_PTP_MODE_V2) {
+ match_data_012 = data + PTP_V2_UUID_OFFSET + 2;
+ } else {
+ match_data_012 = data + PTP_V2_UUID_OFFSET + 0;
+ BUG_ON(ptp->mode != MC_CMD_PTP_MODE_V2_ENHANCED);
+ }
+ }
+
+ /* Does this packet require timestamping? */
+ if (ntohs(*(__be16 *)&data[PTP_DPORT_OFFSET]) == PTP_EVENT_PORT) {
+ match->state = PTP_PACKET_STATE_UNMATCHED;
+
+ /* 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) |
+ (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;
+}
+
+int efx_ptp_get_mode(struct efx_nic *efx)
+{
+ return efx->ptp_data->mode;
+}
+
+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 = 0;
+
+ 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;
+ if (netif_running(efx->net_dev))
+ 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)
+{
+ int rc;
+
+ if (init->flags)
+ return -EINVAL;
+
+ if ((init->tx_type != HWTSTAMP_TX_OFF) &&
+ (init->tx_type != HWTSTAMP_TX_ON))
+ return -ERANGE;
+
+ rc = efx->type->ptp_set_ts_config(efx, init);
+ if (rc)
+ 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;
+ struct efx_nic *primary = efx->primary;
+
+ ASSERT_RTNL();
+
+ if (!ptp)
+ return;
+
+ ts_info->so_timestamping |= (SOF_TIMESTAMPING_TX_HARDWARE |
+ SOF_TIMESTAMPING_RX_HARDWARE |
+ SOF_TIMESTAMPING_RAW_HARDWARE);
+ if (primary && primary->ptp_data && primary->ptp_data->phc_clock)
+ ts_info->phc_index =
+ ptp_clock_index(primary->ptp_data->phc_clock);
+ ts_info->tx_types = 1 << HWTSTAMP_TX_OFF | 1 << HWTSTAMP_TX_ON;
+ ts_info->rx_filters = ptp->efx->type->hwtstamp_filters;
+}
+
+int efx_ptp_set_ts_config(struct efx_nic *efx, struct ifreq *ifr)
+{
+ 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;
+}
+
+int efx_ptp_get_ts_config(struct efx_nic *efx, struct ifreq *ifr)
+{
+ if (!efx->ptp_data)
+ return -EOPNOTSUPP;
+
+ return copy_to_user(ifr->ifr_data, &efx->ptp_data->config,
+ sizeof(efx->ptp_data->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 (WARN_ON_ONCE(ptp->rx_ts_inline))
+ return;
+
+ 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 = efx->ptp_data->nic_to_kernel_time(
+ EFX_QWORD_FIELD(ptp->evt_frags[0], MCDI_EVENT_DATA),
+ EFX_QWORD_FIELD(ptp->evt_frags[1], MCDI_EVENT_DATA),
+ ptp->ts_corrections.rx);
+ 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 if (net_ratelimit()) {
+ /* Log a rate-limited warning message. */
+ netif_err(efx, rx_err, efx->net_dev, "PTP event queue overflow\n");
+ }
+ 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) {
+ if (net_ratelimit())
+ netif_warn(efx, drv, efx->net_dev,
+ "Received PTP event but PTP not set up\n");
+ return;
+ }
+
+ 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;
+ }
+}
+
+void efx_time_sync_event(struct efx_channel *channel, efx_qword_t *ev)
+{
+ channel->sync_timestamp_major = MCDI_EVENT_FIELD(*ev, PTP_TIME_MAJOR);
+ channel->sync_timestamp_minor =
+ MCDI_EVENT_FIELD(*ev, PTP_TIME_MINOR_26_19) << 19;
+ /* if sync events have been disabled then we want to silently ignore
+ * this event, so throw away result.
+ */
+ (void) cmpxchg(&channel->sync_events_state, SYNC_EVENTS_REQUESTED,
+ SYNC_EVENTS_VALID);
+}
+
+/* make some assumptions about the time representation rather than abstract it,
+ * since we currently only support one type of inline timestamping and only on
+ * EF10.
+ */
+#define MINOR_TICKS_PER_SECOND 0x8000000
+/* Fuzz factor for sync events to be out of order with RX events */
+#define FUZZ (MINOR_TICKS_PER_SECOND / 10)
+#define EXPECTED_SYNC_EVENTS_PER_SECOND 4
+
+static inline u32 efx_rx_buf_timestamp_minor(struct efx_nic *efx, const u8 *eh)
+{
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
+ return __le32_to_cpup((const __le32 *)(eh + efx->rx_packet_ts_offset));
+#else
+ const u8 *data = eh + efx->rx_packet_ts_offset;
+ return (u32)data[0] |
+ (u32)data[1] << 8 |
+ (u32)data[2] << 16 |
+ (u32)data[3] << 24;
+#endif
+}
+
+void __efx_rx_skb_attach_timestamp(struct efx_channel *channel,
+ struct sk_buff *skb)
+{
+ struct efx_nic *efx = channel->efx;
+ u32 pkt_timestamp_major, pkt_timestamp_minor;
+ u32 diff, carry;
+ struct skb_shared_hwtstamps *timestamps;
+
+ pkt_timestamp_minor = (efx_rx_buf_timestamp_minor(efx,
+ skb_mac_header(skb)) +
+ (u32) efx->ptp_data->ts_corrections.rx) &
+ (MINOR_TICKS_PER_SECOND - 1);
+
+ /* get the difference between the packet and sync timestamps,
+ * modulo one second
+ */
+ diff = (pkt_timestamp_minor - channel->sync_timestamp_minor) &
+ (MINOR_TICKS_PER_SECOND - 1);
+ /* do we roll over a second boundary and need to carry the one? */
+ carry = channel->sync_timestamp_minor + diff > MINOR_TICKS_PER_SECOND ?
+ 1 : 0;
+
+ if (diff <= MINOR_TICKS_PER_SECOND / EXPECTED_SYNC_EVENTS_PER_SECOND +
+ FUZZ) {
+ /* packet is ahead of the sync event by a quarter of a second or
+ * less (allowing for fuzz)
+ */
+ pkt_timestamp_major = channel->sync_timestamp_major + carry;
+ } else if (diff >= MINOR_TICKS_PER_SECOND - FUZZ) {
+ /* packet is behind the sync event but within the fuzz factor.
+ * This means the RX packet and sync event crossed as they were
+ * placed on the event queue, which can sometimes happen.
+ */
+ pkt_timestamp_major = channel->sync_timestamp_major - 1 + carry;
+ } else {
+ /* it's outside tolerance in both directions. this might be
+ * indicative of us missing sync events for some reason, so
+ * we'll call it an error rather than risk giving a bogus
+ * timestamp.
+ */
+ netif_vdbg(efx, drv, efx->net_dev,
+ "packet timestamp %x too far from sync event %x:%x\n",
+ pkt_timestamp_minor, channel->sync_timestamp_major,
+ channel->sync_timestamp_minor);
+ return;
+ }
+
+ /* attach the timestamps to the skb */
+ timestamps = skb_hwtstamps(skb);
+ timestamps->hwtstamp =
+ efx_ptp_s27_to_ktime(pkt_timestamp_major, pkt_timestamp_minor);
+}
+
+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->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 = adjustment_ns;
+ return 0;
+}
+
+static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+ u32 nic_major, nic_minor;
+ struct efx_ptp_data *ptp_data = container_of(ptp,
+ struct efx_ptp_data,
+ phc_clock_info);
+ struct efx_nic *efx = ptp_data->efx;
+ MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_ADJUST_LEN);
+
+ efx->ptp_data->ns_to_nic_time(delta, &nic_major, &nic_minor);
+
+ 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, ptp_data->current_adjfreq);
+ MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_MAJOR, nic_major);
+ MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_MINOR, nic_minor);
+ 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 timespec64 *ts)
+{
+ struct efx_ptp_data *ptp_data = container_of(ptp,
+ struct efx_ptp_data,
+ phc_clock_info);
+ struct efx_nic *efx = ptp_data->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;
+ ktime_t kt;
+
+ 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;
+
+ kt = ptp_data->nic_to_kernel_time(
+ MCDI_DWORD(outbuf, PTP_OUT_READ_NIC_TIME_MAJOR),
+ MCDI_DWORD(outbuf, PTP_OUT_READ_NIC_TIME_MINOR), 0);
+ *ts = ktime_to_timespec64(kt);
+ return 0;
+}
+
+static int efx_phc_settime(struct ptp_clock_info *ptp,
+ const struct timespec64 *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 timespec64 time_now;
+ struct timespec64 delta;
+
+ rc = efx_phc_gettime(ptp, &time_now);
+ if (rc != 0)
+ return rc;
+
+ delta = timespec64_sub(*e_ts, time_now);
+
+ rc = efx_phc_adjtime(ptp, timespec64_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_defer_probe_with_channel(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;
+}
+
+void efx_ptp_start_datapath(struct efx_nic *efx)
+{
+ if (efx_ptp_restart(efx))
+ netif_err(efx, drv, efx->net_dev, "Failed to restart PTP.\n");
+ /* re-enable timestamping if it was previously enabled */
+ if (efx->type->ptp_set_ts_sync_events)
+ efx->type->ptp_set_ts_sync_events(efx, true, true);
+}
+
+void efx_ptp_stop_datapath(struct efx_nic *efx)
+{
+ /* temporarily disable timestamping */
+ if (efx->type->ptp_set_ts_sync_events)
+ efx->type->ptp_set_ts_sync_events(efx, false, true);
+ efx_ptp_stop(efx);
+}
Code Review / kvmfornfv.git / blobdiff