Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2295 insertions, 0 deletions

diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c
new file mode 100644
index 000000000..692c7f132
--- /dev/null
+++ b/drivers/net/ethernet/sfc/ptp.c
@@ -0,0 +1,2295 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/****************************************************************************
+ * Driver for Solarflare network controllers and boards
+ * Copyright 2011-2013 Solarflare Communications Inc.
+ */
+
+/* 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/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 "tx.h"
+#include "nic.h" /* indirectly includes ptp.h */
+#include "efx_channels.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_RXFILTERS_LEN	5
+
+#define PTP_ADDR_IPV4		0xe0000181	/* 224.0.1.129 */
+#define PTP_ADDR_IPV6		{0xff, 0x0e, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
+				0, 0x01, 0x81}	/* ff0e::181 */
+#define PTP_EVENT_PORT		319
+#define PTP_GENERAL_PORT	320
+#define PTP_ADDR_ETHER		{0x01, 0x1b, 0x19, 0, 0, 0} /* 01-1B-19-00-00-00 */
+
+/* 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
+
+/* Precalculate scale word to avoid long long division at runtime */
+/* This is equivalent to 2^66 / 10^9. */
+#define PPB_SCALE_WORD  ((1LL << (57)) / 1953125LL)
+
+/* How much to shift down after scaling to convert to FP40 */
+#define PPB_SHIFT_FP40		26
+/* ... and FP44. */
+#define PPB_SHIFT_FP44		22
+
+#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)
+ * @link: list of events
+ * @seq0: First part of (PTP) UUID
+ * @seq1: Second part of (PTP) UUID and sequence number
+ * @hwtimestamp: Event timestamp
+ * @expiry: Time which the packet arrived
+ */
+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 SKB queue (awaiting timestamps)
+ * @txq: Transmit SKB 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).
+ * @rxfilters: Receive filters when operating
+ * @rxfilters_count: Num of installed rxfilters, should be == PTP_RXFILTERS_LEN
+ * @config: Current timestamp configuration
+ * @enabled: PTP operation enabled
+ * @mode: Mode in which PTP operating (PTP version)
+ * @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
+ * @nic_time: contains time details
+ * @nic_time.minor_max: Wrap point for NIC minor times
+ * @nic_time.sync_event_diff_min: Minimum acceptable difference between time
+ * in packet prefix and last MCDI time sync event i.e. how much earlier than
+ * the last sync event time a packet timestamp can be.
+ * @nic_time.sync_event_diff_max: Maximum acceptable difference between time
+ * in packet prefix and last MCDI time sync event i.e. how much later than
+ * the last sync event time a packet timestamp can be.
+ * @nic_time.sync_event_minor_shift: Shift required to make minor time from
+ * field in MCDI time sync event.
+ * @min_synchronisation_ns: Minimum acceptable corrected sync window
+ * @capabilities: Capabilities flags from the NIC
+ * @ts_corrections: contains corrections details
+ * @ts_corrections.ptp_tx: Required driver correction of PTP packet transmit
+ *                         timestamps
+ * @ts_corrections.ptp_rx: Required driver correction of PTP packet receive
+ *                         timestamps
+ * @ts_corrections.pps_out: PPS output error (information only)
+ * @ts_corrections.pps_in: Required driver correction of PPS input timestamps
+ * @ts_corrections.general_tx: Required driver correction of general packet
+ *                             transmit timestamps
+ * @ts_corrections.general_rx: Required driver correction of general packet
+ *                             receive 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
+ * @adjfreq_ppb_shift: Shift required to convert scaled parts-per-billion
+ * frequency adjustment into a fixed point fractional nanosecond format.
+ * @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.
+ * @xmit_skb: Transmit SKB function.
+ */
+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 rxfilters[PTP_RXFILTERS_LEN];
+	size_t rxfilters_count;
+	struct hwtstamp_config config;
+	bool enabled;
+	unsigned int mode;
+	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);
+	struct {
+		u32 minor_max;
+		u32 sync_event_diff_min;
+		u32 sync_event_diff_max;
+		unsigned int sync_event_minor_shift;
+	} nic_time;
+	unsigned int min_synchronisation_ns;
+	unsigned int capabilities;
+	struct {
+		s32 ptp_tx;
+		s32 ptp_rx;
+		s32 pps_out;
+		s32 pps_in;
+		s32 general_tx;
+		s32 general_rx;
+	} 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;
+	unsigned int adjfreq_ppb_shift;
+	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;
+	efx_dword_t txbuf[MCDI_TX_BUF_LEN(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];
+	void (*xmit_skb)(struct efx_nic *efx, struct sk_buff *skb);
+};
+
+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);
+
+bool efx_ptp_use_mac_tx_timestamps(struct efx_nic *efx)
+{
+	return efx_has_cap(efx, TX_MAC_TIMESTAMPING);
+}
+
+/* PTP 'extra' channel is still a traffic channel, but we only create TX queues
+ * if PTP uses MAC TX timestamps, not if PTP uses the MC directly to transmit.
+ */
+static bool efx_ptp_want_txqs(struct efx_channel *channel)
+{
+	return efx_ptp_use_mac_tx_timestamps(channel->efx);
+}
+
+#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)
+		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 timespec64 ts = ns_to_timespec64(ns);
+	*nic_major = (u32)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 timespec64 ts = ns_to_timespec64(ns);
+	u32 maj = (u32)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);
+}
+
+/* For Medford2 platforms the time is in seconds and quarter nanoseconds. */
+static void efx_ptp_ns_to_s_qns(s64 ns, u32 *nic_major, u32 *nic_minor)
+{
+	struct timespec64 ts = ns_to_timespec64(ns);
+
+	*nic_major = (u32)ts.tv_sec;
+	*nic_minor = ts.tv_nsec * 4;
+}
+
+static ktime_t efx_ptp_s_qns_to_ktime_correction(u32 nic_major, u32 nic_minor,
+						 s32 correction)
+{
+	ktime_t kt;
+
+	nic_minor = DIV_ROUND_CLOSEST(nic_minor, 4);
+	correction = DIV_ROUND_CLOSEST(correction, 4);
+
+	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;
+}
+
+struct efx_channel *efx_ptp_channel(struct efx_nic *efx)
+{
+	return efx->ptp_data ? efx->ptp_data->channel : NULL;
+}
+
+void efx_ptp_update_channel(struct efx_nic *efx, struct efx_channel *channel)
+{
+	if (efx->ptp_data)
+		efx->ptp_data->channel = channel;
+}
+
+static u32 last_sync_timestamp_major(struct efx_nic *efx)
+{
+	struct efx_channel *channel = efx_ptp_channel(efx);
+	u32 major = 0;
+
+	if (channel)
+		major = channel->sync_timestamp_major;
+	return major;
+}
+
+/* The 8000 series and later can provide the time from the MAC, which is only
+ * 48 bits long and provides meta-information in the top 2 bits.
+ */
+static ktime_t
+efx_ptp_mac_nic_to_ktime_correction(struct efx_nic *efx,
+				    struct efx_ptp_data *ptp,
+				    u32 nic_major, u32 nic_minor,
+				    s32 correction)
+{
+	u32 sync_timestamp;
+	ktime_t kt = { 0 };
+	s16 delta;
+
+	if (!(nic_major & 0x80000000)) {
+		WARN_ON_ONCE(nic_major >> 16);
+
+		/* Medford provides 48 bits of timestamp, so we must get the top
+		 * 16 bits from the timesync event state.
+		 *
+		 * We only have the lower 16 bits of the time now, but we do
+		 * have a full resolution timestamp at some point in past. As
+		 * long as the difference between the (real) now and the sync
+		 * is less than 2^15, then we can reconstruct the difference
+		 * between those two numbers using only the lower 16 bits of
+		 * each.
+		 *
+		 * Put another way
+		 *
+		 * a - b = ((a mod k) - b) mod k
+		 *
+		 * when -k/2 < (a-b) < k/2. In our case k is 2^16. We know
+		 * (a mod k) and b, so can calculate the delta, a - b.
+		 *
+		 */
+		sync_timestamp = last_sync_timestamp_major(efx);
+
+		/* Because delta is s16 this does an implicit mask down to
+		 * 16 bits which is what we need, assuming
+		 * MEDFORD_TX_SECS_EVENT_BITS is 16. delta is signed so that
+		 * we can deal with the (unlikely) case of sync timestamps
+		 * arriving from the future.
+		 */
+		delta = nic_major - sync_timestamp;
+
+		/* Recover the fully specified time now, by applying the offset
+		 * to the (fully specified) sync time.
+		 */
+		nic_major = sync_timestamp + delta;
+
+		kt = ptp->nic_to_kernel_time(nic_major, nic_minor,
+					     correction);
+	}
+	return kt;
+}
+
+ktime_t efx_ptp_nic_to_kernel_time(struct efx_tx_queue *tx_queue)
+{
+	struct efx_nic *efx = tx_queue->efx;
+	struct efx_ptp_data *ptp = efx->ptp_data;
+	ktime_t kt;
+
+	if (efx_ptp_use_mac_tx_timestamps(efx))
+		kt = efx_ptp_mac_nic_to_ktime_correction(efx, ptp,
+				tx_queue->completed_timestamp_major,
+				tx_queue->completed_timestamp_minor,
+				ptp->ts_corrections.general_tx);
+	else
+		kt = ptp->nic_to_kernel_time(
+				tx_queue->completed_timestamp_major,
+				tx_queue->completed_timestamp_minor,
+				ptp->ts_corrections.general_tx);
+	return kt;
+}
+
+/* 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_quiet(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 if (rc == -EPERM) {
+		pci_info(efx->pci_dev, "no PTP support\n");
+		return rc;
+	} else {
+		efx_mcdi_display_error(efx, MC_CMD_PTP, sizeof(inbuf),
+				       outbuf, sizeof(outbuf), rc);
+		return rc;
+	}
+
+	switch (fmt) {
+	case 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;
+		ptp->nic_time.minor_max = 1 << 27;
+		ptp->nic_time.sync_event_minor_shift = 19;
+		break;
+	case 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;
+		ptp->nic_time.minor_max = 1000000000;
+		ptp->nic_time.sync_event_minor_shift = 22;
+		break;
+	case MC_CMD_PTP_OUT_GET_ATTRIBUTES_SECONDS_QTR_NANOSECONDS:
+		ptp->ns_to_nic_time = efx_ptp_ns_to_s_qns;
+		ptp->nic_to_kernel_time = efx_ptp_s_qns_to_ktime_correction;
+		ptp->nic_time.minor_max = 4000000000UL;
+		ptp->nic_time.sync_event_minor_shift = 24;
+		break;
+	default:
+		return -ERANGE;
+	}
+
+	/* Precalculate acceptable difference between the minor time in the
+	 * packet prefix and the last MCDI time sync event. We expect the
+	 * packet prefix timestamp to be after of sync event by up to one
+	 * sync event interval (0.25s) but we allow it to exceed this by a
+	 * fuzz factor of (0.1s)
+	 */
+	ptp->nic_time.sync_event_diff_min = ptp->nic_time.minor_max
+		- (ptp->nic_time.minor_max / 10);
+	ptp->nic_time.sync_event_diff_max = (ptp->nic_time.minor_max / 4)
+		+ (ptp->nic_time.minor_max / 10);
+
+	/* MC_CMD_PTP_OP_GET_ATTRIBUTES has been extended twice from an older
+	 * operation MC_CMD_PTP_OP_GET_TIME_FORMAT. The function now may return
+	 * a value to use for the minimum acceptable corrected synchronization
+	 * window and may return further capabilities.
+	 * 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_CAPABILITIES_OFST)
+		ptp->min_synchronisation_ns =
+			MCDI_DWORD(outbuf,
+				   PTP_OUT_GET_ATTRIBUTES_SYNC_WINDOW_MIN);
+	else
+		ptp->min_synchronisation_ns = DEFAULT_MIN_SYNCHRONISATION_NS;
+
+	if (rc == 0 &&
+	    out_len >= MC_CMD_PTP_OUT_GET_ATTRIBUTES_LEN)
+		ptp->capabilities = MCDI_DWORD(outbuf,
+					PTP_OUT_GET_ATTRIBUTES_CAPABILITIES);
+	else
+		ptp->capabilities = 0;
+
+	/* Set up the shift for conversion between frequency
+	 * adjustments in parts-per-billion and the fixed-point
+	 * fractional ns format that the adapter uses.
+	 */
+	if (ptp->capabilities & (1 << MC_CMD_PTP_OUT_GET_ATTRIBUTES_FP44_FREQ_ADJ_LBN))
+		ptp->adjfreq_ppb_shift = PPB_SHIFT_FP44;
+	else
+		ptp->adjfreq_ppb_shift = PPB_SHIFT_FP40;
+
+	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_V2_LEN);
+	int rc;
+	size_t out_len;
+
+	/* 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_quiet(efx, MC_CMD_PTP, inbuf, sizeof(inbuf),
+				outbuf, sizeof(outbuf), &out_len);
+	if (rc == 0) {
+		efx->ptp_data->ts_corrections.ptp_tx = MCDI_DWORD(outbuf,
+			PTP_OUT_GET_TIMESTAMP_CORRECTIONS_TRANSMIT);
+		efx->ptp_data->ts_corrections.ptp_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);
+
+		if (out_len >= MC_CMD_PTP_OUT_GET_TIMESTAMP_CORRECTIONS_V2_LEN) {
+			efx->ptp_data->ts_corrections.general_tx = MCDI_DWORD(
+				outbuf,
+				PTP_OUT_GET_TIMESTAMP_CORRECTIONS_V2_GENERAL_TX);
+			efx->ptp_data->ts_corrections.general_rx = MCDI_DWORD(
+				outbuf,
+				PTP_OUT_GET_TIMESTAMP_CORRECTIONS_V2_GENERAL_RX);
+		} else {
+			efx->ptp_data->ts_corrections.general_tx =
+				efx->ptp_data->ts_corrections.ptp_tx;
+			efx->ptp_data->ts_corrections.general_rx =
+				efx->ptp_data->ts_corrections.ptp_rx;
+		}
+	} else if (rc == -EINVAL) {
+		efx->ptp_data->ts_corrections.ptp_tx = 0;
+		efx->ptp_data->ts_corrections.ptp_rx = 0;
+		efx->ptp_data->ts_corrections.pps_out = 0;
+		efx->ptp_data->ts_corrections.pps_in = 0;
+		efx->ptp_data->ts_corrections.general_tx = 0;
+		efx->ptp_data->ts_corrections.general_rx = 0;
+	} else {
+		efx_mcdi_display_error(efx, MC_CMD_PTP, sizeof(inbuf), outbuf,
+				       sizeof(outbuf), rc);
+		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_ERR(outbuf);
+	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_ERR(outbuf);
+	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 we get ENOSYS, the NIC doesn't support PTP, and thus this function
+	 * should only have been called during probe.
+	 */
+	if (rc == -ENOSYS || rc == -EPERM)
+		pci_info(efx->pci_dev, "no PTP support\n");
+	else 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 timespec64 limit;
+	struct efx_ptp_data *ptp = efx->ptp_data;
+	int *mc_running = ptp->start.addr;
+
+	pps_get_ts(&now);
+	limit = now.ts_real;
+	timespec64_add_ns(&limit, SYNCHRONISE_PERIOD_NS);
+
+	/* Write host time for specified period or until MC is done */
+	while ((timespec64_compare(&now.ts_real, &limit) < 0) &&
+	       READ_ONCE(*mc_running)) {
+		struct timespec64 update_time;
+		unsigned int host_time;
+
+		/* Don't update continuously to avoid saturating the PCIe bus */
+		update_time = now.ts_real;
+		timespec64_add_ns(&update_time, SYNCHRONISATION_GRANULARITY_NS);
+		do {
+			pps_get_ts(&now);
+		} while ((timespec64_compare(&now.ts_real, &update_time) < 0) &&
+			 READ_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 timespec64 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 timespec64 wait;
+
+		efx_ptp_read_timeset(
+			MCDI_ARRAY_STRUCT_PTR(synch_buf,
+					      PTP_OUT_SYNCHRONIZE_TIMESET, i),
+			&ptp->timeset[i]);
+
+		wait = ktime_to_timespec64(
+			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_timespec64(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 */
+	WRITE_ONCE(*start, 0);
+	rc = efx_mcdi_rpc_start(efx, MC_CMD_PTP, synch_buf,
+				MC_CMD_PTP_IN_SYNCHRONIZE_LEN);
+	EFX_WARN_ON_ONCE_PARANOID(rc);
+
+	/* Wait for start from MCDI (or timeout) */
+	timeout = jiffies + msecs_to_jiffies(MAX_SYNCHRONISE_WAIT_MS);
+	while (!READ_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 (READ_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 dedicated hardware timestamped queue. */
+static void efx_ptp_xmit_skb_queue(struct efx_nic *efx, struct sk_buff *skb)
+{
+	struct efx_ptp_data *ptp_data = efx->ptp_data;
+	u8 type = efx_tx_csum_type_skb(skb);
+	struct efx_tx_queue *tx_queue;
+
+	tx_queue = efx_channel_get_tx_queue(ptp_data->channel, type);
+	if (tx_queue && tx_queue->timestamping) {
+		/* This code invokes normal driver TX code which is always
+		 * protected from softirqs when called from generic TX code,
+		 * which in turn disables preemption. Look at __dev_queue_xmit
+		 * which uses rcu_read_lock_bh disabling preemption for RCU
+		 * plus disabling softirqs. We do not need RCU reader
+		 * protection here.
+		 *
+		 * Although it is theoretically safe for current PTP TX/RX code
+		 * running without disabling softirqs, there are three good
+		 * reasond for doing so:
+		 *
+		 *      1) The code invoked is mainly implemented for non-PTP
+		 *         packets and it is always executed with softirqs
+		 *         disabled.
+		 *      2) This being a single PTP packet, better to not
+		 *         interrupt its processing by softirqs which can lead
+		 *         to high latencies.
+		 *      3) netdev_xmit_more checks preemption is disabled and
+		 *         triggers a BUG_ON if not.
+		 */
+		local_bh_disable();
+		efx_enqueue_skb(tx_queue, skb);
+		local_bh_enable();
+	} else {
+		WARN_ONCE(1, "PTP channel has no timestamped tx queue\n");
+		dev_kfree_skb_any(skb);
+	}
+}
+
+/* Transmit a PTP packet, via the MCDI interface, to the wire. */
+static void efx_ptp_xmit_skb_mc(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(&timestamps, 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.ptp_tx);
+
+	skb_tstamp_tx(skb, &timestamps);
+
+	rc = 0;
+
+fail:
+	dev_kfree_skb_any(skb);
+
+	return;
+}
+
+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);
+	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;
+
+	while (ptp->rxfilters_count) {
+		ptp->rxfilters_count--;
+		efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED,
+					  ptp->rxfilters[ptp->rxfilters_count]);
+	}
+}
+
+static void efx_ptp_init_filter(struct efx_nic *efx,
+				struct efx_filter_spec *rxfilter)
+{
+	struct efx_channel *channel = efx->ptp_data->channel;
+	struct efx_rx_queue *queue = efx_channel_get_rx_queue(channel);
+
+	efx_filter_init_rx(rxfilter, EFX_FILTER_PRI_REQUIRED, 0,
+			   efx_rx_queue_index(queue));
+}
+
+static int efx_ptp_insert_filter(struct efx_nic *efx,
+				 struct efx_filter_spec *rxfilter)
+{
+	struct efx_ptp_data *ptp = efx->ptp_data;
+
+	int rc = efx_filter_insert_filter(efx, rxfilter, true);
+	if (rc < 0)
+		return rc;
+	ptp->rxfilters[ptp->rxfilters_count] = rc;
+	ptp->rxfilters_count++;
+	return 0;
+}
+
+static int efx_ptp_insert_ipv4_filter(struct efx_nic *efx, u16 port)
+{
+	struct efx_filter_spec rxfilter;
+
+	efx_ptp_init_filter(efx, &rxfilter);
+	efx_filter_set_ipv4_local(&rxfilter, IPPROTO_UDP, htonl(PTP_ADDR_IPV4),
+				  htons(port));
+	return efx_ptp_insert_filter(efx, &rxfilter);
+}
+
+static int efx_ptp_insert_ipv6_filter(struct efx_nic *efx, u16 port)
+{
+	const struct in6_addr addr = {{PTP_ADDR_IPV6}};
+	struct efx_filter_spec rxfilter;
+
+	efx_ptp_init_filter(efx, &rxfilter);
+	efx_filter_set_ipv6_local(&rxfilter, IPPROTO_UDP, &addr, htons(port));
+	return efx_ptp_insert_filter(efx, &rxfilter);
+}
+
+static int efx_ptp_insert_eth_filter(struct efx_nic *efx)
+{
+	const u8 addr[ETH_ALEN] = PTP_ADDR_ETHER;
+	struct efx_filter_spec rxfilter;
+
+	efx_ptp_init_filter(efx, &rxfilter);
+	efx_filter_set_eth_local(&rxfilter, EFX_FILTER_VID_UNSPEC, addr);
+	rxfilter.match_flags |= EFX_FILTER_MATCH_ETHER_TYPE;
+	rxfilter.ether_type = htons(ETH_P_1588);
+	return efx_ptp_insert_filter(efx, &rxfilter);
+}
+
+static int efx_ptp_insert_multicast_filters(struct efx_nic *efx)
+{
+	struct efx_ptp_data *ptp = efx->ptp_data;
+	int rc;
+
+	if (!ptp->channel || ptp->rxfilters_count)
+		return 0;
+
+	/* Must filter on both event and general ports to ensure
+	 * that there is no packet re-ordering.
+	 */
+	rc = efx_ptp_insert_ipv4_filter(efx, PTP_EVENT_PORT);
+	if (rc < 0)
+		goto fail;
+
+	rc = efx_ptp_insert_ipv4_filter(efx, PTP_GENERAL_PORT);
+	if (rc < 0)
+		goto fail;
+
+	/* if the NIC supports hw timestamps by the MAC, we can support
+	 * PTP over IPv6 and Ethernet
+	 */
+	if (efx_ptp_use_mac_tx_timestamps(efx)) {
+		rc = efx_ptp_insert_ipv6_filter(efx, PTP_EVENT_PORT);
+		if (rc < 0)
+			goto fail;
+
+		rc = efx_ptp_insert_ipv6_filter(efx, PTP_GENERAL_PORT);
+		if (rc < 0)
+			goto fail;
+
+		rc = efx_ptp_insert_eth_filter(efx);
+		/* Not all firmware variants support this filter */
+		if (rc < 0 && rc != -EPROTONOSUPPORT)
+			goto fail;
+	}
+
+	return 0;
+
+fail:
+	efx_ptp_remove_multicast_filters(efx);
+	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)))
+		ptp_data->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;
+
+	if (efx->ptp_data) {
+		efx->ptp_data->channel = channel;
+		return 0;
+	}
+
+	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;
+	}
+
+	if (efx_ptp_use_mac_tx_timestamps(efx)) {
+		ptp->xmit_skb = efx_ptp_xmit_skb_queue;
+		/* Request sync events on this channel. */
+		channel->sync_events_state = SYNC_EVENTS_QUIESCENT;
+	} else {
+		ptp->xmit_skb = efx_ptp_xmit_skb_mc;
+	}
+
+	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;
+		} else if (ptp->phc_clock) {
+			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;
+	int rc;
+
+	channel->irq_moderation_us = 0;
+	channel->rx_queue.core_index = 0;
+
+	rc = efx_ptp_probe(efx, channel);
+	/* Failure to probe PTP is not fatal; this channel will just not be
+	 * used for anything.
+	 * In the case of EPERM, efx_ptp_probe will print its own message (in
+	 * efx_ptp_get_attributes()), so we don't need to.
+	 */
+	if (rc && rc != -EPERM)
+		netif_warn(efx, drv, efx->net_dev,
+			   "Failed to probe PTP, rc=%d\n", rc);
+	return 0;
+}
+
+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);
+	if (efx->ptp_data->pps_workwq)
+		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);
+	efx->ptp_data = NULL;
+}
+
+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->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);
+	/* Check licensed features.  If we don't have the license for TX
+	 * timestamps, the NIC will not support them.
+	 */
+	if (efx_ptp_use_mac_tx_timestamps(efx)) {
+		struct efx_ef10_nic_data *nic_data = efx->nic_data;
+
+		if (!(nic_data->licensed_features &
+		      (1 << LICENSED_V3_FEATURES_TX_TIMESTAMPS_LBN)))
+			ts_info->so_timestamping &=
+				~SOF_TIMESTAMPING_TX_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.ptp_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 (!efx->ptp_warned) {
+			netif_warn(efx, drv, efx->net_dev,
+				   "Received PTP event but PTP not set up\n");
+			efx->ptp_warned = true;
+		}
+		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)
+{
+	struct efx_nic *efx = channel->efx;
+	struct efx_ptp_data *ptp = efx->ptp_data;
+
+	/* When extracting the sync timestamp minor value, we should discard
+	 * the least significant two bits. These are not required in order
+	 * to reconstruct full-range timestamps and they are optionally used
+	 * to report status depending on the options supplied when subscribing
+	 * for sync events.
+	 */
+	channel->sync_timestamp_major = MCDI_EVENT_FIELD(*ev, PTP_TIME_MAJOR);
+	channel->sync_timestamp_minor =
+		(MCDI_EVENT_FIELD(*ev, PTP_TIME_MINOR_MS_8BITS) & 0xFC)
+			<< ptp->nic_time.sync_event_minor_shift;
+
+	/* 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);
+}
+
+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;
+	struct efx_ptp_data *ptp = efx->ptp_data;
+	u32 pkt_timestamp_major, pkt_timestamp_minor;
+	u32 diff, carry;
+	struct skb_shared_hwtstamps *timestamps;
+
+	if (channel->sync_events_state != SYNC_EVENTS_VALID)
+		return;
+
+	pkt_timestamp_minor = efx_rx_buf_timestamp_minor(efx, skb_mac_header(skb));
+
+	/* get the difference between the packet and sync timestamps,
+	 * modulo one second
+	 */
+	diff = pkt_timestamp_minor - channel->sync_timestamp_minor;
+	if (pkt_timestamp_minor < channel->sync_timestamp_minor)
+		diff += ptp->nic_time.minor_max;
+
+	/* do we roll over a second boundary and need to carry the one? */
+	carry = (channel->sync_timestamp_minor >= ptp->nic_time.minor_max - diff) ?
+		1 : 0;
+
+	if (diff <= ptp->nic_time.sync_event_diff_max) {
+		/* 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 >= ptp->nic_time.sync_event_diff_min) {
+		/* 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 =
+		ptp->nic_to_kernel_time(pkt_timestamp_major,
+					pkt_timestamp_minor,
+					ptp->ts_corrections.general_rx);
+}
+
+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 taking care to round correctly. */
+	adjustment_ns = ((s64)delta * PPB_SCALE_WORD +
+			 (1 << (ptp_data->adjfreq_ppb_shift - 1))) >>
+			ptp_data->adjfreq_ppb_shift;
+
+	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,
+	.copy                   = efx_copy_channel,
+	.receive_skb		= efx_ptp_rx,
+	.want_txqs		= efx_ptp_want_txqs,
+	.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);
+}