1 /****************************************************************************
2 * Driver for Solarflare Solarstorm network controllers and boards
3 * Copyright 2011 Solarflare Communications Inc.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation, incorporated herein by reference.
10 /* Theory of operation:
12 * PTP support is assisted by firmware running on the MC, which provides
13 * the hardware timestamping capabilities. Both transmitted and received
14 * PTP event packets are queued onto internal queues for subsequent processing;
15 * this is because the MC operations are relatively long and would block
16 * block NAPI/interrupt operation.
18 * Receive event processing:
19 * The event contains the packet's UUID and sequence number, together
20 * with the hardware timestamp. The PTP receive packet queue is searched
21 * for this UUID/sequence number and, if found, put on a pending queue.
22 * Packets not matching are delivered without timestamps (MCDI events will
23 * always arrive after the actual packet).
24 * It is important for the operation of the PTP protocol that the ordering
25 * of packets between the event and general port is maintained.
27 * Work queue processing:
28 * If work waiting, synchronise host/hardware time
30 * Transmit: send packet through MC, which returns the transmission time
31 * that is converted to an appropriate timestamp.
33 * Receive: the packet's reception time is converted to an appropriate
37 #include <linux/udp.h>
38 #include <linux/time.h>
39 #include <linux/ktime.h>
40 #include <linux/module.h>
41 #include <linux/net_tstamp.h>
42 #include <linux/pps_kernel.h>
43 #include <linux/ptp_clock_kernel.h>
44 #include "net_driver.h"
47 #include "mcdi_pcol.h"
52 /* Maximum number of events expected to make up a PTP event */
53 #define MAX_EVENT_FRAGS 3
55 /* Maximum delay, ms, to begin synchronisation */
56 #define MAX_SYNCHRONISE_WAIT_MS 2
58 /* How long, at most, to spend synchronising */
59 #define SYNCHRONISE_PERIOD_NS 250000
61 /* How often to update the shared memory time */
62 #define SYNCHRONISATION_GRANULARITY_NS 200
64 /* Minimum permitted length of a (corrected) synchronisation time */
65 #define MIN_SYNCHRONISATION_NS 120
67 /* Maximum permitted length of a (corrected) synchronisation time */
68 #define MAX_SYNCHRONISATION_NS 1000
70 /* How many (MC) receive events that can be queued */
71 #define MAX_RECEIVE_EVENTS 8
73 /* Length of (modified) moving average. */
74 #define AVERAGE_LENGTH 16
76 /* How long an unmatched event or packet can be held */
77 #define PKT_EVENT_LIFETIME_MS 10
79 /* Offsets into PTP packet for identification. These offsets are from the
80 * start of the IP header, not the MAC header. Note that neither PTP V1 nor
81 * PTP V2 permit the use of IPV4 options.
83 #define PTP_DPORT_OFFSET 22
85 #define PTP_V1_VERSION_LENGTH 2
86 #define PTP_V1_VERSION_OFFSET 28
88 #define PTP_V1_UUID_LENGTH 6
89 #define PTP_V1_UUID_OFFSET 50
91 #define PTP_V1_SEQUENCE_LENGTH 2
92 #define PTP_V1_SEQUENCE_OFFSET 58
94 /* The minimum length of a PTP V1 packet for offsets, etc. to be valid:
97 #define PTP_V1_MIN_LENGTH 64
99 #define PTP_V2_VERSION_LENGTH 1
100 #define PTP_V2_VERSION_OFFSET 29
102 #define PTP_V2_UUID_LENGTH 8
103 #define PTP_V2_UUID_OFFSET 48
105 /* Although PTP V2 UUIDs are comprised a ClockIdentity (8) and PortNumber (2),
106 * the MC only captures the last six bytes of the clock identity. These values
107 * reflect those, not the ones used in the standard. The standard permits
108 * mapping of V1 UUIDs to V2 UUIDs with these same values.
110 #define PTP_V2_MC_UUID_LENGTH 6
111 #define PTP_V2_MC_UUID_OFFSET 50
113 #define PTP_V2_SEQUENCE_LENGTH 2
114 #define PTP_V2_SEQUENCE_OFFSET 58
116 /* The minimum length of a PTP V2 packet for offsets, etc. to be valid:
117 * includes IP header.
119 #define PTP_V2_MIN_LENGTH 63
121 #define PTP_MIN_LENGTH 63
123 #define PTP_ADDRESS 0xe0000181 /* 224.0.1.129 */
124 #define PTP_EVENT_PORT 319
125 #define PTP_GENERAL_PORT 320
127 /* Annoyingly the format of the version numbers are different between
128 * versions 1 and 2 so it isn't possible to simply look for 1 or 2.
130 #define PTP_VERSION_V1 1
132 #define PTP_VERSION_V2 2
133 #define PTP_VERSION_V2_MASK 0x0f
135 enum ptp_packet_state
{
136 PTP_PACKET_STATE_UNMATCHED
= 0,
137 PTP_PACKET_STATE_MATCHED
,
138 PTP_PACKET_STATE_TIMED_OUT
,
139 PTP_PACKET_STATE_MATCH_UNWANTED
142 /* NIC synchronised with single word of time only comprising
143 * partial seconds and full nanoseconds: 10^9 ~ 2^30 so 2 bits for seconds.
145 #define MC_NANOSECOND_BITS 30
146 #define MC_NANOSECOND_MASK ((1 << MC_NANOSECOND_BITS) - 1)
147 #define MC_SECOND_MASK ((1 << (32 - MC_NANOSECOND_BITS)) - 1)
149 /* Maximum parts-per-billion adjustment that is acceptable */
150 #define MAX_PPB 1000000
152 /* Number of bits required to hold the above */
153 #define MAX_PPB_BITS 20
155 /* Number of extra bits allowed when calculating fractional ns.
156 * EXTRA_BITS + MC_CMD_PTP_IN_ADJUST_BITS + MAX_PPB_BITS should
159 #define PPB_EXTRA_BITS 2
161 /* Precalculate scale word to avoid long long division at runtime */
162 #define PPB_SCALE_WORD ((1LL << (PPB_EXTRA_BITS + MC_CMD_PTP_IN_ADJUST_BITS +\
163 MAX_PPB_BITS)) / 1000000000LL)
165 #define PTP_SYNC_ATTEMPTS 4
168 * struct efx_ptp_match - Matching structure, stored in sk_buff's cb area.
169 * @words: UUID and (partial) sequence number
170 * @expiry: Time after which the packet should be delivered irrespective of
172 * @state: The state of the packet - whether it is ready for processing or
173 * whether that is of no interest.
175 struct efx_ptp_match
{
176 u32 words
[DIV_ROUND_UP(PTP_V1_UUID_LENGTH
, 4)];
177 unsigned long expiry
;
178 enum ptp_packet_state state
;
182 * struct efx_ptp_event_rx - A PTP receive event (from MC)
183 * @seq0: First part of (PTP) UUID
184 * @seq1: Second part of (PTP) UUID and sequence number
185 * @hwtimestamp: Event timestamp
187 struct efx_ptp_event_rx
{
188 struct list_head link
;
192 unsigned long expiry
;
196 * struct efx_ptp_timeset - Synchronisation between host and MC
197 * @host_start: Host time immediately before hardware timestamp taken
198 * @seconds: Hardware timestamp, seconds
199 * @nanoseconds: Hardware timestamp, nanoseconds
200 * @host_end: Host time immediately after hardware timestamp taken
201 * @waitns: Number of nanoseconds between hardware timestamp being read and
202 * host end time being seen
203 * @window: Difference of host_end and host_start
204 * @valid: Whether this timeset is valid
206 struct efx_ptp_timeset
{
212 u32 window
; /* Derived: end - start, allowing for wrap */
216 * struct efx_ptp_data - Precision Time Protocol (PTP) state
217 * @channel: The PTP channel
218 * @rxq: Receive queue (awaiting timestamps)
219 * @txq: Transmit queue
220 * @evt_list: List of MC receive events awaiting packets
221 * @evt_free_list: List of free events
222 * @evt_lock: Lock for manipulating evt_list and evt_free_list
223 * @rx_evts: Instantiated events (on evt_list and evt_free_list)
224 * @workwq: Work queue for processing pending PTP operations
226 * @reset_required: A serious error has occurred and the PTP task needs to be
227 * reset (disable, enable).
228 * @rxfilter_event: Receive filter when operating
229 * @rxfilter_general: Receive filter when operating
230 * @config: Current timestamp configuration
231 * @enabled: PTP operation enabled
232 * @mode: Mode in which PTP operating (PTP version)
233 * @evt_frags: Partly assembled PTP events
234 * @evt_frag_idx: Current fragment number
235 * @evt_code: Last event code
236 * @start: Address at which MC indicates ready for synchronisation
237 * @host_time_pps: Host time at last PPS
238 * @last_sync_ns: Last number of nanoseconds between readings when synchronising
239 * @base_sync_ns: Number of nanoseconds for last synchronisation.
240 * @base_sync_valid: Whether base_sync_time is valid.
241 * @current_adjfreq: Current ppb adjustment.
242 * @phc_clock: Pointer to registered phc device
243 * @phc_clock_info: Registration structure for phc device
244 * @pps_work: pps work task for handling pps events
245 * @pps_workwq: pps work queue
246 * @nic_ts_enabled: Flag indicating if NIC generated TS events are handled
247 * @txbuf: Buffer for use when transmitting (PTP) packets to MC (avoids
248 * allocations in main data path).
249 * @debug_ptp_dir: PTP debugfs directory
250 * @missed_rx_sync: Number of packets received without syncrhonisation.
251 * @good_syncs: Number of successful synchronisations.
252 * @no_time_syncs: Number of synchronisations with no good times.
253 * @bad_sync_durations: Number of synchronisations with bad durations.
254 * @bad_syncs: Number of failed synchronisations.
255 * @last_sync_time: Number of nanoseconds for last synchronisation.
256 * @sync_timeouts: Number of synchronisation timeouts
257 * @fast_syncs: Number of synchronisations requiring short delay
258 * @min_sync_delta: Minimum time between event and synchronisation
259 * @max_sync_delta: Maximum time between event and synchronisation
260 * @average_sync_delta: Average time between event and synchronisation.
261 * Modified moving average.
262 * @last_sync_delta: Last time between event and synchronisation
263 * @mc_stats: Context value for MC statistics
264 * @timeset: Last set of synchronisation statistics.
266 struct efx_ptp_data
{
267 struct efx_channel
*channel
;
268 struct sk_buff_head rxq
;
269 struct sk_buff_head txq
;
270 struct list_head evt_list
;
271 struct list_head evt_free_list
;
273 struct efx_ptp_event_rx rx_evts
[MAX_RECEIVE_EVENTS
];
274 struct workqueue_struct
*workwq
;
275 struct work_struct work
;
278 u32 rxfilter_general
;
279 bool rxfilter_installed
;
280 struct hwtstamp_config config
;
283 efx_qword_t evt_frags
[MAX_EVENT_FRAGS
];
286 struct efx_buffer start
;
287 struct pps_event_time host_time_pps
;
288 unsigned last_sync_ns
;
289 unsigned base_sync_ns
;
290 bool base_sync_valid
;
292 struct ptp_clock
*phc_clock
;
293 struct ptp_clock_info phc_clock_info
;
294 struct work_struct pps_work
;
295 struct workqueue_struct
*pps_workwq
;
297 u8 txbuf
[ALIGN(MC_CMD_PTP_IN_TRANSMIT_LEN(
298 MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM
), 4)];
299 struct efx_ptp_timeset
300 timeset
[MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_MAXNUM
];
303 static int efx_phc_adjfreq(struct ptp_clock_info
*ptp
, s32 delta
);
304 static int efx_phc_adjtime(struct ptp_clock_info
*ptp
, s64 delta
);
305 static int efx_phc_gettime(struct ptp_clock_info
*ptp
, struct timespec
*ts
);
306 static int efx_phc_settime(struct ptp_clock_info
*ptp
,
307 const struct timespec
*e_ts
);
308 static int efx_phc_enable(struct ptp_clock_info
*ptp
,
309 struct ptp_clock_request
*request
, int on
);
311 /* Enable MCDI PTP support. */
312 static int efx_ptp_enable(struct efx_nic
*efx
)
314 u8 inbuf
[MC_CMD_PTP_IN_ENABLE_LEN
];
316 MCDI_SET_DWORD(inbuf
, PTP_IN_OP
, MC_CMD_PTP_OP_ENABLE
);
317 MCDI_SET_DWORD(inbuf
, PTP_IN_ENABLE_QUEUE
,
318 efx
->ptp_data
->channel
->channel
);
319 MCDI_SET_DWORD(inbuf
, PTP_IN_ENABLE_MODE
, efx
->ptp_data
->mode
);
321 return efx_mcdi_rpc(efx
, MC_CMD_PTP
, inbuf
, sizeof(inbuf
),
325 /* Disable MCDI PTP support.
327 * Note that this function should never rely on the presence of ptp_data -
328 * may be called before that exists.
330 static int efx_ptp_disable(struct efx_nic
*efx
)
332 u8 inbuf
[MC_CMD_PTP_IN_DISABLE_LEN
];
334 MCDI_SET_DWORD(inbuf
, PTP_IN_OP
, MC_CMD_PTP_OP_DISABLE
);
335 return efx_mcdi_rpc(efx
, MC_CMD_PTP
, inbuf
, sizeof(inbuf
),
339 static void efx_ptp_deliver_rx_queue(struct sk_buff_head
*q
)
343 while ((skb
= skb_dequeue(q
))) {
345 netif_receive_skb(skb
);
350 static void efx_ptp_handle_no_channel(struct efx_nic
*efx
)
352 netif_err(efx
, drv
, efx
->net_dev
,
353 "ERROR: PTP requires MSI-X and 1 additional interrupt"
354 "vector. PTP disabled\n");
357 /* Repeatedly send the host time to the MC which will capture the hardware
360 static void efx_ptp_send_times(struct efx_nic
*efx
,
361 struct pps_event_time
*last_time
)
363 struct pps_event_time now
;
364 struct timespec limit
;
365 struct efx_ptp_data
*ptp
= efx
->ptp_data
;
366 struct timespec start
;
367 int *mc_running
= ptp
->start
.addr
;
372 timespec_add_ns(&limit
, SYNCHRONISE_PERIOD_NS
);
374 /* Write host time for specified period or until MC is done */
375 while ((timespec_compare(&now
.ts_real
, &limit
) < 0) &&
376 ACCESS_ONCE(*mc_running
)) {
377 struct timespec update_time
;
378 unsigned int host_time
;
380 /* Don't update continuously to avoid saturating the PCIe bus */
381 update_time
= now
.ts_real
;
382 timespec_add_ns(&update_time
, SYNCHRONISATION_GRANULARITY_NS
);
385 } while ((timespec_compare(&now
.ts_real
, &update_time
) < 0) &&
386 ACCESS_ONCE(*mc_running
));
388 /* Synchronise NIC with single word of time only */
389 host_time
= (now
.ts_real
.tv_sec
<< MC_NANOSECOND_BITS
|
390 now
.ts_real
.tv_nsec
);
391 /* Update host time in NIC memory */
392 _efx_writed(efx
, cpu_to_le32(host_time
),
393 FR_CZ_MC_TREG_SMEM
+ MC_SMEM_P0_PTP_TIME_OFST
);
398 /* Read a timeset from the MC's results and partial process. */
399 static void efx_ptp_read_timeset(u8
*data
, struct efx_ptp_timeset
*timeset
)
401 unsigned start_ns
, end_ns
;
403 timeset
->host_start
= MCDI_DWORD(data
, PTP_OUT_SYNCHRONIZE_HOSTSTART
);
404 timeset
->seconds
= MCDI_DWORD(data
, PTP_OUT_SYNCHRONIZE_SECONDS
);
405 timeset
->nanoseconds
= MCDI_DWORD(data
,
406 PTP_OUT_SYNCHRONIZE_NANOSECONDS
);
407 timeset
->host_end
= MCDI_DWORD(data
, PTP_OUT_SYNCHRONIZE_HOSTEND
),
408 timeset
->waitns
= MCDI_DWORD(data
, PTP_OUT_SYNCHRONIZE_WAITNS
);
411 start_ns
= timeset
->host_start
& MC_NANOSECOND_MASK
;
412 end_ns
= timeset
->host_end
& MC_NANOSECOND_MASK
;
413 /* Allow for rollover */
414 if (end_ns
< start_ns
)
415 end_ns
+= NSEC_PER_SEC
;
416 /* Determine duration of operation */
417 timeset
->window
= end_ns
- start_ns
;
420 /* Process times received from MC.
422 * Extract times from returned results, and establish the minimum value
423 * seen. The minimum value represents the "best" possible time and events
424 * too much greater than this are rejected - the machine is, perhaps, too
425 * busy. A number of readings are taken so that, hopefully, at least one good
426 * synchronisation will be seen in the results.
428 static int efx_ptp_process_times(struct efx_nic
*efx
, u8
*synch_buf
,
429 size_t response_length
,
430 const struct pps_event_time
*last_time
)
432 unsigned number_readings
= (response_length
/
433 MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_LEN
);
436 unsigned min_set
= 0;
439 unsigned last_good
= 0;
440 struct efx_ptp_data
*ptp
= efx
->ptp_data
;
441 bool min_valid
= false;
444 struct timespec delta
;
446 if (number_readings
== 0)
449 /* Find minimum value in this set of results, discarding clearly
452 for (i
= 0; i
< number_readings
; i
++) {
453 efx_ptp_read_timeset(synch_buf
, &ptp
->timeset
[i
]);
454 synch_buf
+= MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_LEN
;
455 if (ptp
->timeset
[i
].window
> SYNCHRONISATION_GRANULARITY_NS
) {
457 if (ptp
->timeset
[i
].window
< min_set
)
458 min_set
= ptp
->timeset
[i
].window
;
461 min_set
= ptp
->timeset
[i
].window
;
467 if (ptp
->base_sync_valid
&& (min_set
> ptp
->base_sync_ns
))
468 min
= ptp
->base_sync_ns
;
472 min
= SYNCHRONISATION_GRANULARITY_NS
;
475 /* Discard excessively long synchronise durations. The MC times
476 * when it finishes reading the host time so the corrected window
477 * time should be fairly constant for a given platform.
480 for (i
= 0; i
< number_readings
; i
++)
481 if (ptp
->timeset
[i
].window
> ptp
->timeset
[i
].waitns
) {
484 win
= ptp
->timeset
[i
].window
- ptp
->timeset
[i
].waitns
;
485 if (win
>= MIN_SYNCHRONISATION_NS
&&
486 win
< MAX_SYNCHRONISATION_NS
) {
487 total
+= ptp
->timeset
[i
].window
;
494 netif_warn(efx
, drv
, efx
->net_dev
,
495 "PTP no suitable synchronisations %dns %dns\n",
496 ptp
->base_sync_ns
, min_set
);
500 /* Average minimum this synchronisation */
501 ptp
->last_sync_ns
= DIV_ROUND_UP(total
, ngood
);
502 if (!ptp
->base_sync_valid
|| (ptp
->last_sync_ns
< ptp
->base_sync_ns
)) {
503 ptp
->base_sync_valid
= true;
504 ptp
->base_sync_ns
= ptp
->last_sync_ns
;
507 /* Calculate delay from actual PPS to last_time */
509 ptp
->timeset
[last_good
].nanoseconds
+
510 last_time
->ts_real
.tv_nsec
-
511 (ptp
->timeset
[last_good
].host_start
& MC_NANOSECOND_MASK
);
513 /* It is possible that the seconds rolled over between taking
514 * the start reading and the last value written by the host. The
515 * timescales are such that a gap of more than one second is never
518 start_sec
= ptp
->timeset
[last_good
].host_start
>> MC_NANOSECOND_BITS
;
519 last_sec
= last_time
->ts_real
.tv_sec
& MC_SECOND_MASK
;
520 if (start_sec
!= last_sec
) {
521 if (((start_sec
+ 1) & MC_SECOND_MASK
) != last_sec
) {
522 netif_warn(efx
, hw
, efx
->net_dev
,
523 "PTP bad synchronisation seconds\n");
532 ptp
->host_time_pps
= *last_time
;
533 pps_sub_ts(&ptp
->host_time_pps
, delta
);
538 /* Synchronize times between the host and the MC */
539 static int efx_ptp_synchronize(struct efx_nic
*efx
, unsigned int num_readings
)
541 struct efx_ptp_data
*ptp
= efx
->ptp_data
;
542 u8 synch_buf
[MC_CMD_PTP_OUT_SYNCHRONIZE_LENMAX
];
543 size_t response_length
;
545 unsigned long timeout
;
546 struct pps_event_time last_time
= {};
547 unsigned int loops
= 0;
548 int *start
= ptp
->start
.addr
;
550 MCDI_SET_DWORD(synch_buf
, PTP_IN_OP
, MC_CMD_PTP_OP_SYNCHRONIZE
);
551 MCDI_SET_DWORD(synch_buf
, PTP_IN_SYNCHRONIZE_NUMTIMESETS
,
553 MCDI_SET_DWORD(synch_buf
, PTP_IN_SYNCHRONIZE_START_ADDR_LO
,
554 (u32
)ptp
->start
.dma_addr
);
555 MCDI_SET_DWORD(synch_buf
, PTP_IN_SYNCHRONIZE_START_ADDR_HI
,
556 (u32
)((u64
)ptp
->start
.dma_addr
>> 32));
558 /* Clear flag that signals MC ready */
559 ACCESS_ONCE(*start
) = 0;
560 efx_mcdi_rpc_start(efx
, MC_CMD_PTP
, synch_buf
,
561 MC_CMD_PTP_IN_SYNCHRONIZE_LEN
);
563 /* Wait for start from MCDI (or timeout) */
564 timeout
= jiffies
+ msecs_to_jiffies(MAX_SYNCHRONISE_WAIT_MS
);
565 while (!ACCESS_ONCE(*start
) && (time_before(jiffies
, timeout
))) {
566 udelay(20); /* Usually start MCDI execution quickly */
570 if (ACCESS_ONCE(*start
))
571 efx_ptp_send_times(efx
, &last_time
);
573 /* Collect results */
574 rc
= efx_mcdi_rpc_finish(efx
, MC_CMD_PTP
,
575 MC_CMD_PTP_IN_SYNCHRONIZE_LEN
,
576 synch_buf
, sizeof(synch_buf
),
579 rc
= efx_ptp_process_times(efx
, synch_buf
, response_length
,
585 /* Transmit a PTP packet, via the MCDI interface, to the wire. */
586 static int efx_ptp_xmit_skb(struct efx_nic
*efx
, struct sk_buff
*skb
)
588 u8
*txbuf
= efx
->ptp_data
->txbuf
;
589 struct skb_shared_hwtstamps timestamps
;
591 /* MCDI driver requires word aligned lengths */
592 size_t len
= ALIGN(MC_CMD_PTP_IN_TRANSMIT_LEN(skb
->len
), 4);
593 u8 txtime
[MC_CMD_PTP_OUT_TRANSMIT_LEN
];
595 MCDI_SET_DWORD(txbuf
, PTP_IN_OP
, MC_CMD_PTP_OP_TRANSMIT
);
596 MCDI_SET_DWORD(txbuf
, PTP_IN_TRANSMIT_LENGTH
, skb
->len
);
597 if (skb_shinfo(skb
)->nr_frags
!= 0) {
598 rc
= skb_linearize(skb
);
603 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
604 rc
= skb_checksum_help(skb
);
608 skb_copy_from_linear_data(skb
,
609 &txbuf
[MC_CMD_PTP_IN_TRANSMIT_PACKET_OFST
],
611 rc
= efx_mcdi_rpc(efx
, MC_CMD_PTP
, txbuf
, len
, txtime
,
612 sizeof(txtime
), &len
);
616 memset(×tamps
, 0, sizeof(timestamps
));
617 timestamps
.hwtstamp
= ktime_set(
618 MCDI_DWORD(txtime
, PTP_OUT_TRANSMIT_SECONDS
),
619 MCDI_DWORD(txtime
, PTP_OUT_TRANSMIT_NANOSECONDS
));
621 skb_tstamp_tx(skb
, ×tamps
);
631 static void efx_ptp_drop_time_expired_events(struct efx_nic
*efx
)
633 struct efx_ptp_data
*ptp
= efx
->ptp_data
;
634 struct list_head
*cursor
;
635 struct list_head
*next
;
637 /* Drop time-expired events */
638 spin_lock_bh(&ptp
->evt_lock
);
639 if (!list_empty(&ptp
->evt_list
)) {
640 list_for_each_safe(cursor
, next
, &ptp
->evt_list
) {
641 struct efx_ptp_event_rx
*evt
;
643 evt
= list_entry(cursor
, struct efx_ptp_event_rx
,
645 if (time_after(jiffies
, evt
->expiry
)) {
646 list_move(&evt
->link
, &ptp
->evt_free_list
);
647 netif_warn(efx
, hw
, efx
->net_dev
,
648 "PTP rx event dropped\n");
652 spin_unlock_bh(&ptp
->evt_lock
);
655 static enum ptp_packet_state
efx_ptp_match_rx(struct efx_nic
*efx
,
658 struct efx_ptp_data
*ptp
= efx
->ptp_data
;
660 struct list_head
*cursor
;
661 struct list_head
*next
;
662 struct efx_ptp_match
*match
;
663 enum ptp_packet_state rc
= PTP_PACKET_STATE_UNMATCHED
;
665 spin_lock_bh(&ptp
->evt_lock
);
666 evts_waiting
= !list_empty(&ptp
->evt_list
);
667 spin_unlock_bh(&ptp
->evt_lock
);
670 return PTP_PACKET_STATE_UNMATCHED
;
672 match
= (struct efx_ptp_match
*)skb
->cb
;
673 /* Look for a matching timestamp in the event queue */
674 spin_lock_bh(&ptp
->evt_lock
);
675 list_for_each_safe(cursor
, next
, &ptp
->evt_list
) {
676 struct efx_ptp_event_rx
*evt
;
678 evt
= list_entry(cursor
, struct efx_ptp_event_rx
, link
);
679 if ((evt
->seq0
== match
->words
[0]) &&
680 (evt
->seq1
== match
->words
[1])) {
681 struct skb_shared_hwtstamps
*timestamps
;
683 /* Match - add in hardware timestamp */
684 timestamps
= skb_hwtstamps(skb
);
685 timestamps
->hwtstamp
= evt
->hwtimestamp
;
687 match
->state
= PTP_PACKET_STATE_MATCHED
;
688 rc
= PTP_PACKET_STATE_MATCHED
;
689 list_move(&evt
->link
, &ptp
->evt_free_list
);
693 spin_unlock_bh(&ptp
->evt_lock
);
698 /* Process any queued receive events and corresponding packets
700 * q is returned with all the packets that are ready for delivery.
701 * true is returned if at least one of those packets requires
704 static bool efx_ptp_process_events(struct efx_nic
*efx
, struct sk_buff_head
*q
)
706 struct efx_ptp_data
*ptp
= efx
->ptp_data
;
710 while ((skb
= skb_dequeue(&ptp
->rxq
))) {
711 struct efx_ptp_match
*match
;
713 match
= (struct efx_ptp_match
*)skb
->cb
;
714 if (match
->state
== PTP_PACKET_STATE_MATCH_UNWANTED
) {
715 __skb_queue_tail(q
, skb
);
716 } else if (efx_ptp_match_rx(efx
, skb
) ==
717 PTP_PACKET_STATE_MATCHED
) {
719 __skb_queue_tail(q
, skb
);
720 } else if (time_after(jiffies
, match
->expiry
)) {
721 match
->state
= PTP_PACKET_STATE_TIMED_OUT
;
722 netif_warn(efx
, rx_err
, efx
->net_dev
,
723 "PTP packet - no timestamp seen\n");
724 __skb_queue_tail(q
, skb
);
726 /* Replace unprocessed entry and stop */
727 skb_queue_head(&ptp
->rxq
, skb
);
735 /* Complete processing of a received packet */
736 static inline void efx_ptp_process_rx(struct efx_nic
*efx
, struct sk_buff
*skb
)
739 netif_receive_skb(skb
);
743 static int efx_ptp_start(struct efx_nic
*efx
)
745 struct efx_ptp_data
*ptp
= efx
->ptp_data
;
746 struct efx_filter_spec rxfilter
;
749 ptp
->reset_required
= false;
751 /* Must filter on both event and general ports to ensure
752 * that there is no packet re-ordering.
754 efx_filter_init_rx(&rxfilter
, EFX_FILTER_PRI_REQUIRED
, 0,
756 efx_channel_get_rx_queue(ptp
->channel
)));
757 rc
= efx_filter_set_ipv4_local(&rxfilter
, IPPROTO_UDP
,
759 htons(PTP_EVENT_PORT
));
763 rc
= efx_filter_insert_filter(efx
, &rxfilter
, true);
766 ptp
->rxfilter_event
= rc
;
768 efx_filter_init_rx(&rxfilter
, EFX_FILTER_PRI_REQUIRED
, 0,
770 efx_channel_get_rx_queue(ptp
->channel
)));
771 rc
= efx_filter_set_ipv4_local(&rxfilter
, IPPROTO_UDP
,
773 htons(PTP_GENERAL_PORT
));
777 rc
= efx_filter_insert_filter(efx
, &rxfilter
, true);
780 ptp
->rxfilter_general
= rc
;
782 rc
= efx_ptp_enable(efx
);
786 ptp
->evt_frag_idx
= 0;
787 ptp
->current_adjfreq
= 0;
788 ptp
->rxfilter_installed
= true;
793 efx_filter_remove_id_safe(efx
, EFX_FILTER_PRI_REQUIRED
,
794 ptp
->rxfilter_general
);
796 efx_filter_remove_id_safe(efx
, EFX_FILTER_PRI_REQUIRED
,
797 ptp
->rxfilter_event
);
802 static int efx_ptp_stop(struct efx_nic
*efx
)
804 struct efx_ptp_data
*ptp
= efx
->ptp_data
;
805 int rc
= efx_ptp_disable(efx
);
806 struct list_head
*cursor
;
807 struct list_head
*next
;
809 if (ptp
->rxfilter_installed
) {
810 efx_filter_remove_id_safe(efx
, EFX_FILTER_PRI_REQUIRED
,
811 ptp
->rxfilter_general
);
812 efx_filter_remove_id_safe(efx
, EFX_FILTER_PRI_REQUIRED
,
813 ptp
->rxfilter_event
);
814 ptp
->rxfilter_installed
= false;
817 /* Make sure RX packets are really delivered */
818 efx_ptp_deliver_rx_queue(&efx
->ptp_data
->rxq
);
819 skb_queue_purge(&efx
->ptp_data
->txq
);
821 /* Drop any pending receive events */
822 spin_lock_bh(&efx
->ptp_data
->evt_lock
);
823 list_for_each_safe(cursor
, next
, &efx
->ptp_data
->evt_list
) {
824 list_move(cursor
, &efx
->ptp_data
->evt_free_list
);
826 spin_unlock_bh(&efx
->ptp_data
->evt_lock
);
831 static void efx_ptp_pps_worker(struct work_struct
*work
)
833 struct efx_ptp_data
*ptp
=
834 container_of(work
, struct efx_ptp_data
, pps_work
);
835 struct efx_nic
*efx
= ptp
->channel
->efx
;
836 struct ptp_clock_event ptp_evt
;
838 if (efx_ptp_synchronize(efx
, PTP_SYNC_ATTEMPTS
))
841 ptp_evt
.type
= PTP_CLOCK_PPSUSR
;
842 ptp_evt
.pps_times
= ptp
->host_time_pps
;
843 ptp_clock_event(ptp
->phc_clock
, &ptp_evt
);
846 /* Process any pending transmissions and timestamp any received packets.
848 static void efx_ptp_worker(struct work_struct
*work
)
850 struct efx_ptp_data
*ptp_data
=
851 container_of(work
, struct efx_ptp_data
, work
);
852 struct efx_nic
*efx
= ptp_data
->channel
->efx
;
854 struct sk_buff_head tempq
;
856 if (ptp_data
->reset_required
) {
862 efx_ptp_drop_time_expired_events(efx
);
864 __skb_queue_head_init(&tempq
);
865 if (efx_ptp_process_events(efx
, &tempq
) ||
866 !skb_queue_empty(&ptp_data
->txq
)) {
868 while ((skb
= skb_dequeue(&ptp_data
->txq
)))
869 efx_ptp_xmit_skb(efx
, skb
);
872 while ((skb
= __skb_dequeue(&tempq
)))
873 efx_ptp_process_rx(efx
, skb
);
876 /* Initialise PTP channel and state.
878 * Setting core_index to zero causes the queue to be initialised and doesn't
879 * overlap with 'rxq0' because ptp.c doesn't use skb_record_rx_queue.
881 static int efx_ptp_probe_channel(struct efx_channel
*channel
)
883 struct efx_nic
*efx
= channel
->efx
;
884 struct efx_ptp_data
*ptp
;
888 channel
->irq_moderation
= 0;
889 channel
->rx_queue
.core_index
= 0;
891 ptp
= kzalloc(sizeof(struct efx_ptp_data
), GFP_KERNEL
);
896 rc
= efx_nic_alloc_buffer(efx
, &ptp
->start
, sizeof(int));
900 ptp
->channel
= channel
;
901 skb_queue_head_init(&ptp
->rxq
);
902 skb_queue_head_init(&ptp
->txq
);
903 ptp
->workwq
= create_singlethread_workqueue("sfc_ptp");
909 INIT_WORK(&ptp
->work
, efx_ptp_worker
);
910 ptp
->config
.flags
= 0;
911 ptp
->config
.tx_type
= HWTSTAMP_TX_OFF
;
912 ptp
->config
.rx_filter
= HWTSTAMP_FILTER_NONE
;
913 INIT_LIST_HEAD(&ptp
->evt_list
);
914 INIT_LIST_HEAD(&ptp
->evt_free_list
);
915 spin_lock_init(&ptp
->evt_lock
);
916 for (pos
= 0; pos
< MAX_RECEIVE_EVENTS
; pos
++)
917 list_add(&ptp
->rx_evts
[pos
].link
, &ptp
->evt_free_list
);
919 ptp
->phc_clock_info
.owner
= THIS_MODULE
;
920 snprintf(ptp
->phc_clock_info
.name
,
921 sizeof(ptp
->phc_clock_info
.name
),
922 "%pm", efx
->net_dev
->perm_addr
);
923 ptp
->phc_clock_info
.max_adj
= MAX_PPB
;
924 ptp
->phc_clock_info
.n_alarm
= 0;
925 ptp
->phc_clock_info
.n_ext_ts
= 0;
926 ptp
->phc_clock_info
.n_per_out
= 0;
927 ptp
->phc_clock_info
.pps
= 1;
928 ptp
->phc_clock_info
.adjfreq
= efx_phc_adjfreq
;
929 ptp
->phc_clock_info
.adjtime
= efx_phc_adjtime
;
930 ptp
->phc_clock_info
.gettime
= efx_phc_gettime
;
931 ptp
->phc_clock_info
.settime
= efx_phc_settime
;
932 ptp
->phc_clock_info
.enable
= efx_phc_enable
;
934 ptp
->phc_clock
= ptp_clock_register(&ptp
->phc_clock_info
,
939 INIT_WORK(&ptp
->pps_work
, efx_ptp_pps_worker
);
940 ptp
->pps_workwq
= create_singlethread_workqueue("sfc_pps");
941 if (!ptp
->pps_workwq
) {
945 ptp
->nic_ts_enabled
= false;
949 ptp_clock_unregister(efx
->ptp_data
->phc_clock
);
952 destroy_workqueue(efx
->ptp_data
->workwq
);
955 efx_nic_free_buffer(efx
, &ptp
->start
);
958 kfree(efx
->ptp_data
);
959 efx
->ptp_data
= NULL
;
964 static void efx_ptp_remove_channel(struct efx_channel
*channel
)
966 struct efx_nic
*efx
= channel
->efx
;
971 (void)efx_ptp_disable(channel
->efx
);
973 cancel_work_sync(&efx
->ptp_data
->work
);
974 cancel_work_sync(&efx
->ptp_data
->pps_work
);
976 skb_queue_purge(&efx
->ptp_data
->rxq
);
977 skb_queue_purge(&efx
->ptp_data
->txq
);
979 ptp_clock_unregister(efx
->ptp_data
->phc_clock
);
981 destroy_workqueue(efx
->ptp_data
->workwq
);
982 destroy_workqueue(efx
->ptp_data
->pps_workwq
);
984 efx_nic_free_buffer(efx
, &efx
->ptp_data
->start
);
985 kfree(efx
->ptp_data
);
988 static void efx_ptp_get_channel_name(struct efx_channel
*channel
,
989 char *buf
, size_t len
)
991 snprintf(buf
, len
, "%s-ptp", channel
->efx
->name
);
994 /* Determine whether this packet should be processed by the PTP module
995 * or transmitted conventionally.
997 bool efx_ptp_is_ptp_tx(struct efx_nic
*efx
, struct sk_buff
*skb
)
999 return efx
->ptp_data
&&
1000 efx
->ptp_data
->enabled
&&
1001 skb
->len
>= PTP_MIN_LENGTH
&&
1002 skb
->len
<= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM
&&
1003 likely(skb
->protocol
== htons(ETH_P_IP
)) &&
1004 ip_hdr(skb
)->protocol
== IPPROTO_UDP
&&
1005 udp_hdr(skb
)->dest
== htons(PTP_EVENT_PORT
);
1008 /* Receive a PTP packet. Packets are queued until the arrival of
1009 * the receive timestamp from the MC - this will probably occur after the
1010 * packet arrival because of the processing in the MC.
1012 static bool efx_ptp_rx(struct efx_channel
*channel
, struct sk_buff
*skb
)
1014 struct efx_nic
*efx
= channel
->efx
;
1015 struct efx_ptp_data
*ptp
= efx
->ptp_data
;
1016 struct efx_ptp_match
*match
= (struct efx_ptp_match
*)skb
->cb
;
1017 u8
*match_data_012
, *match_data_345
;
1018 unsigned int version
;
1020 match
->expiry
= jiffies
+ msecs_to_jiffies(PKT_EVENT_LIFETIME_MS
);
1022 /* Correct version? */
1023 if (ptp
->mode
== MC_CMD_PTP_MODE_V1
) {
1024 if (skb
->len
< PTP_V1_MIN_LENGTH
) {
1027 version
= ntohs(*(__be16
*)&skb
->data
[PTP_V1_VERSION_OFFSET
]);
1028 if (version
!= PTP_VERSION_V1
) {
1032 /* PTP V1 uses all six bytes of the UUID to match the packet
1035 match_data_012
= skb
->data
+ PTP_V1_UUID_OFFSET
;
1036 match_data_345
= skb
->data
+ PTP_V1_UUID_OFFSET
+ 3;
1038 if (skb
->len
< PTP_V2_MIN_LENGTH
) {
1041 version
= skb
->data
[PTP_V2_VERSION_OFFSET
];
1042 if ((version
& PTP_VERSION_V2_MASK
) != PTP_VERSION_V2
) {
1046 /* The original V2 implementation uses bytes 2-7 of
1047 * the UUID to match the packet to the timestamp. This
1048 * discards two of the bytes of the MAC address used
1049 * to create the UUID (SF bug 33070). The PTP V2
1050 * enhanced mode fixes this issue and uses bytes 0-2
1051 * and byte 5-7 of the UUID.
1053 match_data_345
= skb
->data
+ PTP_V2_UUID_OFFSET
+ 5;
1054 if (ptp
->mode
== MC_CMD_PTP_MODE_V2
) {
1055 match_data_012
= skb
->data
+ PTP_V2_UUID_OFFSET
+ 2;
1057 match_data_012
= skb
->data
+ PTP_V2_UUID_OFFSET
+ 0;
1058 BUG_ON(ptp
->mode
!= MC_CMD_PTP_MODE_V2_ENHANCED
);
1062 /* Does this packet require timestamping? */
1063 if (ntohs(*(__be16
*)&skb
->data
[PTP_DPORT_OFFSET
]) == PTP_EVENT_PORT
) {
1064 struct skb_shared_hwtstamps
*timestamps
;
1066 match
->state
= PTP_PACKET_STATE_UNMATCHED
;
1068 /* Clear all timestamps held: filled in later */
1069 timestamps
= skb_hwtstamps(skb
);
1070 memset(timestamps
, 0, sizeof(*timestamps
));
1072 /* We expect the sequence number to be in the same position in
1073 * the packet for PTP V1 and V2
1075 BUILD_BUG_ON(PTP_V1_SEQUENCE_OFFSET
!= PTP_V2_SEQUENCE_OFFSET
);
1076 BUILD_BUG_ON(PTP_V1_SEQUENCE_LENGTH
!= PTP_V2_SEQUENCE_LENGTH
);
1078 /* Extract UUID/Sequence information */
1079 match
->words
[0] = (match_data_012
[0] |
1080 (match_data_012
[1] << 8) |
1081 (match_data_012
[2] << 16) |
1082 (match_data_345
[0] << 24));
1083 match
->words
[1] = (match_data_345
[1] |
1084 (match_data_345
[2] << 8) |
1085 (skb
->data
[PTP_V1_SEQUENCE_OFFSET
+
1086 PTP_V1_SEQUENCE_LENGTH
- 1] <<
1089 match
->state
= PTP_PACKET_STATE_MATCH_UNWANTED
;
1092 skb_queue_tail(&ptp
->rxq
, skb
);
1093 queue_work(ptp
->workwq
, &ptp
->work
);
1098 /* Transmit a PTP packet. This has to be transmitted by the MC
1099 * itself, through an MCDI call. MCDI calls aren't permitted
1100 * in the transmit path so defer the actual transmission to a suitable worker.
1102 int efx_ptp_tx(struct efx_nic
*efx
, struct sk_buff
*skb
)
1104 struct efx_ptp_data
*ptp
= efx
->ptp_data
;
1106 skb_queue_tail(&ptp
->txq
, skb
);
1108 if ((udp_hdr(skb
)->dest
== htons(PTP_EVENT_PORT
)) &&
1109 (skb
->len
<= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM
))
1110 efx_xmit_hwtstamp_pending(skb
);
1111 queue_work(ptp
->workwq
, &ptp
->work
);
1113 return NETDEV_TX_OK
;
1116 static int efx_ptp_change_mode(struct efx_nic
*efx
, bool enable_wanted
,
1117 unsigned int new_mode
)
1119 if ((enable_wanted
!= efx
->ptp_data
->enabled
) ||
1120 (enable_wanted
&& (efx
->ptp_data
->mode
!= new_mode
))) {
1123 if (enable_wanted
) {
1124 /* Change of mode requires disable */
1125 if (efx
->ptp_data
->enabled
&&
1126 (efx
->ptp_data
->mode
!= new_mode
)) {
1127 efx
->ptp_data
->enabled
= false;
1128 rc
= efx_ptp_stop(efx
);
1133 /* Set new operating mode and establish
1134 * baseline synchronisation, which must
1137 efx
->ptp_data
->mode
= new_mode
;
1138 rc
= efx_ptp_start(efx
);
1140 rc
= efx_ptp_synchronize(efx
,
1141 PTP_SYNC_ATTEMPTS
* 2);
1146 rc
= efx_ptp_stop(efx
);
1152 efx
->ptp_data
->enabled
= enable_wanted
;
1158 static int efx_ptp_ts_init(struct efx_nic
*efx
, struct hwtstamp_config
*init
)
1160 bool enable_wanted
= false;
1161 unsigned int new_mode
;
1167 if ((init
->tx_type
!= HWTSTAMP_TX_OFF
) &&
1168 (init
->tx_type
!= HWTSTAMP_TX_ON
))
1171 new_mode
= efx
->ptp_data
->mode
;
1172 /* Determine whether any PTP HW operations are required */
1173 switch (init
->rx_filter
) {
1174 case HWTSTAMP_FILTER_NONE
:
1176 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT
:
1177 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC
:
1178 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ
:
1179 init
->rx_filter
= HWTSTAMP_FILTER_PTP_V1_L4_EVENT
;
1180 new_mode
= MC_CMD_PTP_MODE_V1
;
1181 enable_wanted
= true;
1183 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT
:
1184 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC
:
1185 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ
:
1186 /* Although these three are accepted only IPV4 packets will be
1189 init
->rx_filter
= HWTSTAMP_FILTER_PTP_V2_L4_EVENT
;
1190 new_mode
= MC_CMD_PTP_MODE_V2_ENHANCED
;
1191 enable_wanted
= true;
1193 case HWTSTAMP_FILTER_PTP_V2_EVENT
:
1194 case HWTSTAMP_FILTER_PTP_V2_SYNC
:
1195 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ
:
1196 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT
:
1197 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC
:
1198 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ
:
1199 /* Non-IP + IPv6 timestamping not supported */
1206 if (init
->tx_type
!= HWTSTAMP_TX_OFF
)
1207 enable_wanted
= true;
1209 /* Old versions of the firmware do not support the improved
1210 * UUID filtering option (SF bug 33070). If the firmware does
1211 * not accept the enhanced mode, fall back to the standard PTP
1212 * v2 UUID filtering.
1214 rc
= efx_ptp_change_mode(efx
, enable_wanted
, new_mode
);
1215 if ((rc
!= 0) && (new_mode
== MC_CMD_PTP_MODE_V2_ENHANCED
))
1216 rc
= efx_ptp_change_mode(efx
, enable_wanted
, MC_CMD_PTP_MODE_V2
);
1220 efx
->ptp_data
->config
= *init
;
1226 efx_ptp_get_ts_info(struct net_device
*net_dev
, struct ethtool_ts_info
*ts_info
)
1228 struct efx_nic
*efx
= netdev_priv(net_dev
);
1229 struct efx_ptp_data
*ptp
= efx
->ptp_data
;
1234 ts_info
->so_timestamping
= (SOF_TIMESTAMPING_TX_HARDWARE
|
1235 SOF_TIMESTAMPING_RX_HARDWARE
|
1236 SOF_TIMESTAMPING_RAW_HARDWARE
);
1237 ts_info
->phc_index
= ptp_clock_index(ptp
->phc_clock
);
1238 ts_info
->tx_types
= 1 << HWTSTAMP_TX_OFF
| 1 << HWTSTAMP_TX_ON
;
1239 ts_info
->rx_filters
= (1 << HWTSTAMP_FILTER_NONE
|
1240 1 << HWTSTAMP_FILTER_PTP_V1_L4_EVENT
|
1241 1 << HWTSTAMP_FILTER_PTP_V1_L4_SYNC
|
1242 1 << HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ
|
1243 1 << HWTSTAMP_FILTER_PTP_V2_L4_EVENT
|
1244 1 << HWTSTAMP_FILTER_PTP_V2_L4_SYNC
|
1245 1 << HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ
);
1249 int efx_ptp_ioctl(struct efx_nic
*efx
, struct ifreq
*ifr
, int cmd
)
1251 struct hwtstamp_config config
;
1254 /* Not a PTP enabled port */
1258 if (copy_from_user(&config
, ifr
->ifr_data
, sizeof(config
)))
1261 rc
= efx_ptp_ts_init(efx
, &config
);
1265 return copy_to_user(ifr
->ifr_data
, &config
, sizeof(config
))
1269 static void ptp_event_failure(struct efx_nic
*efx
, int expected_frag_len
)
1271 struct efx_ptp_data
*ptp
= efx
->ptp_data
;
1273 netif_err(efx
, hw
, efx
->net_dev
,
1274 "PTP unexpected event length: got %d expected %d\n",
1275 ptp
->evt_frag_idx
, expected_frag_len
);
1276 ptp
->reset_required
= true;
1277 queue_work(ptp
->workwq
, &ptp
->work
);
1280 /* Process a completed receive event. Put it on the event queue and
1281 * start worker thread. This is required because event and their
1282 * correspoding packets may come in either order.
1284 static void ptp_event_rx(struct efx_nic
*efx
, struct efx_ptp_data
*ptp
)
1286 struct efx_ptp_event_rx
*evt
= NULL
;
1288 if (ptp
->evt_frag_idx
!= 3) {
1289 ptp_event_failure(efx
, 3);
1293 spin_lock_bh(&ptp
->evt_lock
);
1294 if (!list_empty(&ptp
->evt_free_list
)) {
1295 evt
= list_first_entry(&ptp
->evt_free_list
,
1296 struct efx_ptp_event_rx
, link
);
1297 list_del(&evt
->link
);
1299 evt
->seq0
= EFX_QWORD_FIELD(ptp
->evt_frags
[2], MCDI_EVENT_DATA
);
1300 evt
->seq1
= (EFX_QWORD_FIELD(ptp
->evt_frags
[2],
1302 (EFX_QWORD_FIELD(ptp
->evt_frags
[1],
1303 MCDI_EVENT_SRC
) << 8) |
1304 (EFX_QWORD_FIELD(ptp
->evt_frags
[0],
1305 MCDI_EVENT_SRC
) << 16));
1306 evt
->hwtimestamp
= ktime_set(
1307 EFX_QWORD_FIELD(ptp
->evt_frags
[0], MCDI_EVENT_DATA
),
1308 EFX_QWORD_FIELD(ptp
->evt_frags
[1], MCDI_EVENT_DATA
));
1309 evt
->expiry
= jiffies
+ msecs_to_jiffies(PKT_EVENT_LIFETIME_MS
);
1310 list_add_tail(&evt
->link
, &ptp
->evt_list
);
1312 queue_work(ptp
->workwq
, &ptp
->work
);
1314 netif_err(efx
, rx_err
, efx
->net_dev
, "No free PTP event");
1316 spin_unlock_bh(&ptp
->evt_lock
);
1319 static void ptp_event_fault(struct efx_nic
*efx
, struct efx_ptp_data
*ptp
)
1321 int code
= EFX_QWORD_FIELD(ptp
->evt_frags
[0], MCDI_EVENT_DATA
);
1322 if (ptp
->evt_frag_idx
!= 1) {
1323 ptp_event_failure(efx
, 1);
1327 netif_err(efx
, hw
, efx
->net_dev
, "PTP error %d\n", code
);
1330 static void ptp_event_pps(struct efx_nic
*efx
, struct efx_ptp_data
*ptp
)
1332 if (ptp
->nic_ts_enabled
)
1333 queue_work(ptp
->pps_workwq
, &ptp
->pps_work
);
1336 void efx_ptp_event(struct efx_nic
*efx
, efx_qword_t
*ev
)
1338 struct efx_ptp_data
*ptp
= efx
->ptp_data
;
1339 int code
= EFX_QWORD_FIELD(*ev
, MCDI_EVENT_CODE
);
1344 if (ptp
->evt_frag_idx
== 0) {
1345 ptp
->evt_code
= code
;
1346 } else if (ptp
->evt_code
!= code
) {
1347 netif_err(efx
, hw
, efx
->net_dev
,
1348 "PTP out of sequence event %d\n", code
);
1349 ptp
->evt_frag_idx
= 0;
1352 ptp
->evt_frags
[ptp
->evt_frag_idx
++] = *ev
;
1353 if (!MCDI_EVENT_FIELD(*ev
, CONT
)) {
1354 /* Process resulting event */
1356 case MCDI_EVENT_CODE_PTP_RX
:
1357 ptp_event_rx(efx
, ptp
);
1359 case MCDI_EVENT_CODE_PTP_FAULT
:
1360 ptp_event_fault(efx
, ptp
);
1362 case MCDI_EVENT_CODE_PTP_PPS
:
1363 ptp_event_pps(efx
, ptp
);
1366 netif_err(efx
, hw
, efx
->net_dev
,
1367 "PTP unknown event %d\n", code
);
1370 ptp
->evt_frag_idx
= 0;
1371 } else if (MAX_EVENT_FRAGS
== ptp
->evt_frag_idx
) {
1372 netif_err(efx
, hw
, efx
->net_dev
,
1373 "PTP too many event fragments\n");
1374 ptp
->evt_frag_idx
= 0;
1378 static int efx_phc_adjfreq(struct ptp_clock_info
*ptp
, s32 delta
)
1380 struct efx_ptp_data
*ptp_data
= container_of(ptp
,
1381 struct efx_ptp_data
,
1383 struct efx_nic
*efx
= ptp_data
->channel
->efx
;
1384 u8 inadj
[MC_CMD_PTP_IN_ADJUST_LEN
];
1388 if (delta
> MAX_PPB
)
1390 else if (delta
< -MAX_PPB
)
1393 /* Convert ppb to fixed point ns. */
1394 adjustment_ns
= (((s64
)delta
* PPB_SCALE_WORD
) >>
1395 (PPB_EXTRA_BITS
+ MAX_PPB_BITS
));
1397 MCDI_SET_DWORD(inadj
, PTP_IN_OP
, MC_CMD_PTP_OP_ADJUST
);
1398 MCDI_SET_DWORD(inadj
, PTP_IN_ADJUST_FREQ_LO
, (u32
)adjustment_ns
);
1399 MCDI_SET_DWORD(inadj
, PTP_IN_ADJUST_FREQ_HI
,
1400 (u32
)(adjustment_ns
>> 32));
1401 MCDI_SET_DWORD(inadj
, PTP_IN_ADJUST_SECONDS
, 0);
1402 MCDI_SET_DWORD(inadj
, PTP_IN_ADJUST_NANOSECONDS
, 0);
1403 rc
= efx_mcdi_rpc(efx
, MC_CMD_PTP
, inadj
, sizeof(inadj
),
1408 ptp_data
->current_adjfreq
= delta
;
1412 static int efx_phc_adjtime(struct ptp_clock_info
*ptp
, s64 delta
)
1414 struct efx_ptp_data
*ptp_data
= container_of(ptp
,
1415 struct efx_ptp_data
,
1417 struct efx_nic
*efx
= ptp_data
->channel
->efx
;
1418 struct timespec delta_ts
= ns_to_timespec(delta
);
1419 u8 inbuf
[MC_CMD_PTP_IN_ADJUST_LEN
];
1421 MCDI_SET_DWORD(inbuf
, PTP_IN_OP
, MC_CMD_PTP_OP_ADJUST
);
1422 MCDI_SET_DWORD(inbuf
, PTP_IN_ADJUST_FREQ_LO
, 0);
1423 MCDI_SET_DWORD(inbuf
, PTP_IN_ADJUST_FREQ_HI
, 0);
1424 MCDI_SET_DWORD(inbuf
, PTP_IN_ADJUST_SECONDS
, (u32
)delta_ts
.tv_sec
);
1425 MCDI_SET_DWORD(inbuf
, PTP_IN_ADJUST_NANOSECONDS
, (u32
)delta_ts
.tv_nsec
);
1426 return efx_mcdi_rpc(efx
, MC_CMD_PTP
, inbuf
, sizeof(inbuf
),
1430 static int efx_phc_gettime(struct ptp_clock_info
*ptp
, struct timespec
*ts
)
1432 struct efx_ptp_data
*ptp_data
= container_of(ptp
,
1433 struct efx_ptp_data
,
1435 struct efx_nic
*efx
= ptp_data
->channel
->efx
;
1436 u8 inbuf
[MC_CMD_PTP_IN_READ_NIC_TIME_LEN
];
1437 u8 outbuf
[MC_CMD_PTP_OUT_READ_NIC_TIME_LEN
];
1440 MCDI_SET_DWORD(inbuf
, PTP_IN_OP
, MC_CMD_PTP_OP_READ_NIC_TIME
);
1442 rc
= efx_mcdi_rpc(efx
, MC_CMD_PTP
, inbuf
, sizeof(inbuf
),
1443 outbuf
, sizeof(outbuf
), NULL
);
1447 ts
->tv_sec
= MCDI_DWORD(outbuf
, PTP_OUT_READ_NIC_TIME_SECONDS
);
1448 ts
->tv_nsec
= MCDI_DWORD(outbuf
, PTP_OUT_READ_NIC_TIME_NANOSECONDS
);
1452 static int efx_phc_settime(struct ptp_clock_info
*ptp
,
1453 const struct timespec
*e_ts
)
1455 /* Get the current NIC time, efx_phc_gettime.
1456 * Subtract from the desired time to get the offset
1457 * call efx_phc_adjtime with the offset
1460 struct timespec time_now
;
1461 struct timespec delta
;
1463 rc
= efx_phc_gettime(ptp
, &time_now
);
1467 delta
= timespec_sub(*e_ts
, time_now
);
1469 rc
= efx_phc_adjtime(ptp
, timespec_to_ns(&delta
));
1476 static int efx_phc_enable(struct ptp_clock_info
*ptp
,
1477 struct ptp_clock_request
*request
,
1480 struct efx_ptp_data
*ptp_data
= container_of(ptp
,
1481 struct efx_ptp_data
,
1483 if (request
->type
!= PTP_CLK_REQ_PPS
)
1486 ptp_data
->nic_ts_enabled
= !!enable
;
1490 static const struct efx_channel_type efx_ptp_channel_type
= {
1491 .handle_no_channel
= efx_ptp_handle_no_channel
,
1492 .pre_probe
= efx_ptp_probe_channel
,
1493 .post_remove
= efx_ptp_remove_channel
,
1494 .get_name
= efx_ptp_get_channel_name
,
1495 /* no copy operation; there is no need to reallocate this channel */
1496 .receive_skb
= efx_ptp_rx
,
1497 .keep_eventq
= false,
1500 void efx_ptp_probe(struct efx_nic
*efx
)
1502 /* Check whether PTP is implemented on this NIC. The DISABLE
1503 * operation will succeed if and only if it is implemented.
1505 if (efx_ptp_disable(efx
) == 0)
1506 efx
->extra_channel_type
[EFX_EXTRA_CHANNEL_PTP
] =
1507 &efx_ptp_channel_type
;