1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /**************************************************************************** |
3 | * Driver for Solarflare network controllers and boards |
4 | * Copyright 2011-2013 Solarflare Communications Inc. |
5 | */ |
6 | |
7 | /* Theory of operation: |
8 | * |
9 | * PTP support is assisted by firmware running on the MC, which provides |
10 | * the hardware timestamping capabilities. Both transmitted and received |
11 | * PTP event packets are queued onto internal queues for subsequent processing; |
12 | * this is because the MC operations are relatively long and would block |
13 | * block NAPI/interrupt operation. |
14 | * |
15 | * Receive event processing: |
16 | * The event contains the packet's UUID and sequence number, together |
17 | * with the hardware timestamp. The PTP receive packet queue is searched |
18 | * for this UUID/sequence number and, if found, put on a pending queue. |
19 | * Packets not matching are delivered without timestamps (MCDI events will |
20 | * always arrive after the actual packet). |
21 | * It is important for the operation of the PTP protocol that the ordering |
22 | * of packets between the event and general port is maintained. |
23 | * |
24 | * Work queue processing: |
25 | * If work waiting, synchronise host/hardware time |
26 | * |
27 | * Transmit: send packet through MC, which returns the transmission time |
28 | * that is converted to an appropriate timestamp. |
29 | * |
30 | * Receive: the packet's reception time is converted to an appropriate |
31 | * timestamp. |
32 | */ |
33 | #include <linux/ip.h> |
34 | #include <linux/udp.h> |
35 | #include <linux/time.h> |
36 | #include <linux/errno.h> |
37 | #include <linux/ktime.h> |
38 | #include <linux/module.h> |
39 | #include <linux/pps_kernel.h> |
40 | #include <linux/ptp_clock_kernel.h> |
41 | #include "net_driver.h" |
42 | #include "efx.h" |
43 | #include "mcdi.h" |
44 | #include "mcdi_pcol.h" |
45 | #include "io.h" |
46 | #include "tx.h" |
47 | #include "nic.h" /* indirectly includes ptp.h */ |
48 | #include "efx_channels.h" |
49 | |
50 | /* Maximum number of events expected to make up a PTP event */ |
51 | #define MAX_EVENT_FRAGS 3 |
52 | |
53 | /* Maximum delay, ms, to begin synchronisation */ |
54 | #define MAX_SYNCHRONISE_WAIT_MS 2 |
55 | |
56 | /* How long, at most, to spend synchronising */ |
57 | #define SYNCHRONISE_PERIOD_NS 250000 |
58 | |
59 | /* How often to update the shared memory time */ |
60 | #define SYNCHRONISATION_GRANULARITY_NS 200 |
61 | |
62 | /* Minimum permitted length of a (corrected) synchronisation time */ |
63 | #define DEFAULT_MIN_SYNCHRONISATION_NS 120 |
64 | |
65 | /* Maximum permitted length of a (corrected) synchronisation time */ |
66 | #define MAX_SYNCHRONISATION_NS 1000 |
67 | |
68 | /* How many (MC) receive events that can be queued */ |
69 | #define MAX_RECEIVE_EVENTS 8 |
70 | |
71 | /* Length of (modified) moving average. */ |
72 | #define AVERAGE_LENGTH 16 |
73 | |
74 | /* How long an unmatched event or packet can be held */ |
75 | #define PKT_EVENT_LIFETIME_MS 10 |
76 | |
77 | /* How long unused unicast filters can be held */ |
78 | #define UCAST_FILTER_EXPIRY_JIFFIES msecs_to_jiffies(30000) |
79 | |
80 | /* Offsets into PTP packet for identification. These offsets are from the |
81 | * start of the IP header, not the MAC header. Note that neither PTP V1 nor |
82 | * PTP V2 permit the use of IPV4 options. |
83 | */ |
84 | #define PTP_DPORT_OFFSET 22 |
85 | |
86 | #define PTP_V1_VERSION_LENGTH 2 |
87 | #define PTP_V1_VERSION_OFFSET 28 |
88 | |
89 | #define PTP_V1_SEQUENCE_LENGTH 2 |
90 | #define PTP_V1_SEQUENCE_OFFSET 58 |
91 | |
92 | /* The minimum length of a PTP V1 packet for offsets, etc. to be valid: |
93 | * includes IP header. |
94 | */ |
95 | #define PTP_V1_MIN_LENGTH 64 |
96 | |
97 | #define PTP_V2_VERSION_LENGTH 1 |
98 | #define PTP_V2_VERSION_OFFSET 29 |
99 | |
100 | #define PTP_V2_SEQUENCE_LENGTH 2 |
101 | #define PTP_V2_SEQUENCE_OFFSET 58 |
102 | |
103 | /* The minimum length of a PTP V2 packet for offsets, etc. to be valid: |
104 | * includes IP header. |
105 | */ |
106 | #define PTP_V2_MIN_LENGTH 63 |
107 | |
108 | #define PTP_MIN_LENGTH 63 |
109 | |
110 | #define PTP_ADDR_IPV4 0xe0000181 /* 224.0.1.129 */ |
111 | |
112 | /* ff0e::181 */ |
113 | static const struct in6_addr ptp_addr_ipv6 = { { { |
114 | 0xff, 0x0e, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01, 0x81 } } }; |
115 | |
116 | /* 01-1B-19-00-00-00 */ |
117 | static const u8 ptp_addr_ether[ETH_ALEN] __aligned(2) = { |
118 | 0x01, 0x1b, 0x19, 0x00, 0x00, 0x00 }; |
119 | |
120 | #define PTP_EVENT_PORT 319 |
121 | #define PTP_GENERAL_PORT 320 |
122 | |
123 | /* Annoyingly the format of the version numbers are different between |
124 | * versions 1 and 2 so it isn't possible to simply look for 1 or 2. |
125 | */ |
126 | #define PTP_VERSION_V1 1 |
127 | |
128 | #define PTP_VERSION_V2 2 |
129 | #define PTP_VERSION_V2_MASK 0x0f |
130 | |
131 | enum ptp_packet_state { |
132 | PTP_PACKET_STATE_UNMATCHED = 0, |
133 | PTP_PACKET_STATE_MATCHED, |
134 | PTP_PACKET_STATE_TIMED_OUT, |
135 | PTP_PACKET_STATE_MATCH_UNWANTED |
136 | }; |
137 | |
138 | /* NIC synchronised with single word of time only comprising |
139 | * partial seconds and full nanoseconds: 10^9 ~ 2^30 so 2 bits for seconds. |
140 | */ |
141 | #define MC_NANOSECOND_BITS 30 |
142 | #define MC_NANOSECOND_MASK ((1 << MC_NANOSECOND_BITS) - 1) |
143 | #define MC_SECOND_MASK ((1 << (32 - MC_NANOSECOND_BITS)) - 1) |
144 | |
145 | /* Maximum parts-per-billion adjustment that is acceptable */ |
146 | #define MAX_PPB 1000000 |
147 | |
148 | /* Precalculate scale word to avoid long long division at runtime */ |
149 | /* This is equivalent to 2^66 / 10^9. */ |
150 | #define PPB_SCALE_WORD ((1LL << (57)) / 1953125LL) |
151 | |
152 | /* How much to shift down after scaling to convert to FP40 */ |
153 | #define PPB_SHIFT_FP40 26 |
154 | /* ... and FP44. */ |
155 | #define PPB_SHIFT_FP44 22 |
156 | |
157 | #define PTP_SYNC_ATTEMPTS 4 |
158 | |
159 | /** |
160 | * struct efx_ptp_match - Matching structure, stored in sk_buff's cb area. |
161 | * @expiry: Time after which the packet should be delivered irrespective of |
162 | * event arrival. |
163 | * @state: The state of the packet - whether it is ready for processing or |
164 | * whether that is of no interest. |
165 | */ |
166 | struct efx_ptp_match { |
167 | unsigned long expiry; |
168 | enum ptp_packet_state state; |
169 | }; |
170 | |
171 | /** |
172 | * struct efx_ptp_event_rx - A PTP receive event (from MC) |
173 | * @link: list of events |
174 | * @seq0: First part of (PTP) UUID |
175 | * @seq1: Second part of (PTP) UUID and sequence number |
176 | * @hwtimestamp: Event timestamp |
177 | * @expiry: Time which the packet arrived |
178 | */ |
179 | struct efx_ptp_event_rx { |
180 | struct list_head link; |
181 | u32 seq0; |
182 | u32 seq1; |
183 | ktime_t hwtimestamp; |
184 | unsigned long expiry; |
185 | }; |
186 | |
187 | /** |
188 | * struct efx_ptp_timeset - Synchronisation between host and MC |
189 | * @host_start: Host time immediately before hardware timestamp taken |
190 | * @major: Hardware timestamp, major |
191 | * @minor: Hardware timestamp, minor |
192 | * @host_end: Host time immediately after hardware timestamp taken |
193 | * @wait: Number of NIC clock ticks between hardware timestamp being read and |
194 | * host end time being seen |
195 | * @window: Difference of host_end and host_start |
196 | * @valid: Whether this timeset is valid |
197 | */ |
198 | struct efx_ptp_timeset { |
199 | u32 host_start; |
200 | u32 major; |
201 | u32 minor; |
202 | u32 host_end; |
203 | u32 wait; |
204 | u32 window; /* Derived: end - start, allowing for wrap */ |
205 | }; |
206 | |
207 | /** |
208 | * struct efx_ptp_rxfilter - Filter for PTP packets |
209 | * @list: Node of the list where the filter is added |
210 | * @ether_type: Network protocol of the filter (ETHER_P_IP / ETHER_P_IPV6) |
211 | * @loc_port: UDP port of the filter (PTP_EVENT_PORT / PTP_GENERAL_PORT) |
212 | * @loc_host: IPv4/v6 address of the filter |
213 | * @expiry: time when the filter expires, in jiffies |
214 | * @handle: Handle ID for the MCDI filters table |
215 | */ |
216 | struct efx_ptp_rxfilter { |
217 | struct list_head list; |
218 | __be16 ether_type; |
219 | __be16 loc_port; |
220 | __be32 loc_host[4]; |
221 | unsigned long expiry; |
222 | int handle; |
223 | }; |
224 | |
225 | /** |
226 | * struct efx_ptp_data - Precision Time Protocol (PTP) state |
227 | * @efx: The NIC context |
228 | * @channel: The PTP channel (for Medford and Medford2) |
229 | * @rxq: Receive SKB queue (awaiting timestamps) |
230 | * @txq: Transmit SKB queue |
231 | * @workwq: Work queue for processing pending PTP operations |
232 | * @work: Work task |
233 | * @cleanup_work: Work task for periodic cleanup |
234 | * @reset_required: A serious error has occurred and the PTP task needs to be |
235 | * reset (disable, enable). |
236 | * @rxfilters_mcast: Receive filters for multicast PTP packets |
237 | * @rxfilters_ucast: Receive filters for unicast PTP packets |
238 | * @config: Current timestamp configuration |
239 | * @enabled: PTP operation enabled |
240 | * @mode: Mode in which PTP operating (PTP version) |
241 | * @ns_to_nic_time: Function to convert from scalar nanoseconds to NIC time |
242 | * @nic_to_kernel_time: Function to convert from NIC to kernel time |
243 | * @nic_time: contains time details |
244 | * @nic_time.minor_max: Wrap point for NIC minor times |
245 | * @nic_time.sync_event_diff_min: Minimum acceptable difference between time |
246 | * in packet prefix and last MCDI time sync event i.e. how much earlier than |
247 | * the last sync event time a packet timestamp can be. |
248 | * @nic_time.sync_event_diff_max: Maximum acceptable difference between time |
249 | * in packet prefix and last MCDI time sync event i.e. how much later than |
250 | * the last sync event time a packet timestamp can be. |
251 | * @nic_time.sync_event_minor_shift: Shift required to make minor time from |
252 | * field in MCDI time sync event. |
253 | * @min_synchronisation_ns: Minimum acceptable corrected sync window |
254 | * @capabilities: Capabilities flags from the NIC |
255 | * @ts_corrections: contains corrections details |
256 | * @ts_corrections.ptp_tx: Required driver correction of PTP packet transmit |
257 | * timestamps |
258 | * @ts_corrections.ptp_rx: Required driver correction of PTP packet receive |
259 | * timestamps |
260 | * @ts_corrections.pps_out: PPS output error (information only) |
261 | * @ts_corrections.pps_in: Required driver correction of PPS input timestamps |
262 | * @ts_corrections.general_tx: Required driver correction of general packet |
263 | * transmit timestamps |
264 | * @ts_corrections.general_rx: Required driver correction of general packet |
265 | * receive timestamps |
266 | * @evt_frags: Partly assembled PTP events |
267 | * @evt_frag_idx: Current fragment number |
268 | * @evt_code: Last event code |
269 | * @start: Address at which MC indicates ready for synchronisation |
270 | * @host_time_pps: Host time at last PPS |
271 | * @adjfreq_ppb_shift: Shift required to convert scaled parts-per-billion |
272 | * frequency adjustment into a fixed point fractional nanosecond format. |
273 | * @current_adjfreq: Current ppb adjustment. |
274 | * @phc_clock: Pointer to registered phc device (if primary function) |
275 | * @phc_clock_info: Registration structure for phc device |
276 | * @pps_work: pps work task for handling pps events |
277 | * @pps_workwq: pps work queue |
278 | * @nic_ts_enabled: Flag indicating if NIC generated TS events are handled |
279 | * @txbuf: Buffer for use when transmitting (PTP) packets to MC (avoids |
280 | * allocations in main data path). |
281 | * @good_syncs: Number of successful synchronisations. |
282 | * @fast_syncs: Number of synchronisations requiring short delay |
283 | * @bad_syncs: Number of failed synchronisations. |
284 | * @sync_timeouts: Number of synchronisation timeouts |
285 | * @no_time_syncs: Number of synchronisations with no good times. |
286 | * @invalid_sync_windows: Number of sync windows with bad durations. |
287 | * @undersize_sync_windows: Number of corrected sync windows that are too small |
288 | * @oversize_sync_windows: Number of corrected sync windows that are too large |
289 | * @rx_no_timestamp: Number of packets received without a timestamp. |
290 | * @timeset: Last set of synchronisation statistics. |
291 | * @xmit_skb: Transmit SKB function. |
292 | */ |
293 | struct efx_ptp_data { |
294 | struct efx_nic *efx; |
295 | struct efx_channel *channel; |
296 | struct sk_buff_head rxq; |
297 | struct sk_buff_head txq; |
298 | struct workqueue_struct *workwq; |
299 | struct work_struct work; |
300 | struct delayed_work cleanup_work; |
301 | bool reset_required; |
302 | struct list_head rxfilters_mcast; |
303 | struct list_head rxfilters_ucast; |
304 | struct hwtstamp_config config; |
305 | bool enabled; |
306 | unsigned int mode; |
307 | void (*ns_to_nic_time)(s64 ns, u32 *nic_major, u32 *nic_minor); |
308 | ktime_t (*nic_to_kernel_time)(u32 nic_major, u32 nic_minor, |
309 | s32 correction); |
310 | struct { |
311 | u32 minor_max; |
312 | u32 sync_event_diff_min; |
313 | u32 sync_event_diff_max; |
314 | unsigned int sync_event_minor_shift; |
315 | } nic_time; |
316 | unsigned int min_synchronisation_ns; |
317 | unsigned int capabilities; |
318 | struct { |
319 | s32 ptp_tx; |
320 | s32 ptp_rx; |
321 | s32 pps_out; |
322 | s32 pps_in; |
323 | s32 general_tx; |
324 | s32 general_rx; |
325 | } ts_corrections; |
326 | efx_qword_t evt_frags[MAX_EVENT_FRAGS]; |
327 | int evt_frag_idx; |
328 | int evt_code; |
329 | struct efx_buffer start; |
330 | struct pps_event_time host_time_pps; |
331 | unsigned int adjfreq_ppb_shift; |
332 | s64 current_adjfreq; |
333 | struct ptp_clock *phc_clock; |
334 | struct ptp_clock_info phc_clock_info; |
335 | struct work_struct pps_work; |
336 | struct workqueue_struct *pps_workwq; |
337 | bool nic_ts_enabled; |
338 | efx_dword_t txbuf[MCDI_TX_BUF_LEN(MC_CMD_PTP_IN_TRANSMIT_LENMAX)]; |
339 | |
340 | unsigned int good_syncs; |
341 | unsigned int fast_syncs; |
342 | unsigned int bad_syncs; |
343 | unsigned int sync_timeouts; |
344 | unsigned int no_time_syncs; |
345 | unsigned int invalid_sync_windows; |
346 | unsigned int undersize_sync_windows; |
347 | unsigned int oversize_sync_windows; |
348 | unsigned int rx_no_timestamp; |
349 | struct efx_ptp_timeset |
350 | timeset[MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_MAXNUM]; |
351 | void (*xmit_skb)(struct efx_nic *efx, struct sk_buff *skb); |
352 | }; |
353 | |
354 | static int efx_phc_adjfine(struct ptp_clock_info *ptp, long scaled_ppm); |
355 | static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta); |
356 | static int efx_phc_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts); |
357 | static int efx_phc_settime(struct ptp_clock_info *ptp, |
358 | const struct timespec64 *e_ts); |
359 | static int efx_phc_enable(struct ptp_clock_info *ptp, |
360 | struct ptp_clock_request *request, int on); |
361 | static int efx_ptp_insert_unicast_filter(struct efx_nic *efx, |
362 | struct sk_buff *skb); |
363 | |
364 | bool efx_ptp_use_mac_tx_timestamps(struct efx_nic *efx) |
365 | { |
366 | return efx_has_cap(efx, TX_MAC_TIMESTAMPING); |
367 | } |
368 | |
369 | /* PTP 'extra' channel is still a traffic channel, but we only create TX queues |
370 | * if PTP uses MAC TX timestamps, not if PTP uses the MC directly to transmit. |
371 | */ |
372 | static bool efx_ptp_want_txqs(struct efx_channel *channel) |
373 | { |
374 | return efx_ptp_use_mac_tx_timestamps(efx: channel->efx); |
375 | } |
376 | |
377 | #define PTP_SW_STAT(ext_name, field_name) \ |
378 | { #ext_name, 0, offsetof(struct efx_ptp_data, field_name) } |
379 | #define PTP_MC_STAT(ext_name, mcdi_name) \ |
380 | { #ext_name, 32, MC_CMD_PTP_OUT_STATUS_STATS_ ## mcdi_name ## _OFST } |
381 | static const struct efx_hw_stat_desc efx_ptp_stat_desc[] = { |
382 | PTP_SW_STAT(ptp_good_syncs, good_syncs), |
383 | PTP_SW_STAT(ptp_fast_syncs, fast_syncs), |
384 | PTP_SW_STAT(ptp_bad_syncs, bad_syncs), |
385 | PTP_SW_STAT(ptp_sync_timeouts, sync_timeouts), |
386 | PTP_SW_STAT(ptp_no_time_syncs, no_time_syncs), |
387 | PTP_SW_STAT(ptp_invalid_sync_windows, invalid_sync_windows), |
388 | PTP_SW_STAT(ptp_undersize_sync_windows, undersize_sync_windows), |
389 | PTP_SW_STAT(ptp_oversize_sync_windows, oversize_sync_windows), |
390 | PTP_SW_STAT(ptp_rx_no_timestamp, rx_no_timestamp), |
391 | PTP_MC_STAT(ptp_tx_timestamp_packets, TX), |
392 | PTP_MC_STAT(ptp_rx_timestamp_packets, RX), |
393 | PTP_MC_STAT(ptp_timestamp_packets, TS), |
394 | PTP_MC_STAT(ptp_filter_matches, FM), |
395 | PTP_MC_STAT(ptp_non_filter_matches, NFM), |
396 | }; |
397 | #define PTP_STAT_COUNT ARRAY_SIZE(efx_ptp_stat_desc) |
398 | static const unsigned long efx_ptp_stat_mask[] = { |
399 | [0 ... BITS_TO_LONGS(PTP_STAT_COUNT) - 1] = ~0UL, |
400 | }; |
401 | |
402 | size_t efx_ptp_describe_stats(struct efx_nic *efx, u8 *strings) |
403 | { |
404 | if (!efx->ptp_data) |
405 | return 0; |
406 | |
407 | return efx_nic_describe_stats(desc: efx_ptp_stat_desc, PTP_STAT_COUNT, |
408 | mask: efx_ptp_stat_mask, names: strings); |
409 | } |
410 | |
411 | size_t efx_ptp_update_stats(struct efx_nic *efx, u64 *stats) |
412 | { |
413 | MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_STATUS_LEN); |
414 | MCDI_DECLARE_BUF(outbuf, MC_CMD_PTP_OUT_STATUS_LEN); |
415 | size_t i; |
416 | int rc; |
417 | |
418 | if (!efx->ptp_data) |
419 | return 0; |
420 | |
421 | /* Copy software statistics */ |
422 | for (i = 0; i < PTP_STAT_COUNT; i++) { |
423 | if (efx_ptp_stat_desc[i].dma_width) |
424 | continue; |
425 | stats[i] = *(unsigned int *)((char *)efx->ptp_data + |
426 | efx_ptp_stat_desc[i].offset); |
427 | } |
428 | |
429 | /* Fetch MC statistics. We *must* fill in all statistics or |
430 | * risk leaking kernel memory to userland, so if the MCDI |
431 | * request fails we pretend we got zeroes. |
432 | */ |
433 | MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_STATUS); |
434 | MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0); |
435 | rc = efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, inlen: sizeof(inbuf), |
436 | outbuf, outlen: sizeof(outbuf), NULL); |
437 | if (rc) |
438 | memset(outbuf, 0, sizeof(outbuf)); |
439 | efx_nic_update_stats(desc: efx_ptp_stat_desc, PTP_STAT_COUNT, |
440 | mask: efx_ptp_stat_mask, |
441 | stats, _MCDI_PTR(outbuf, 0), accumulate: false); |
442 | |
443 | return PTP_STAT_COUNT; |
444 | } |
445 | |
446 | /* To convert from s27 format to ns we multiply then divide by a power of 2. |
447 | * For the conversion from ns to s27, the operation is also converted to a |
448 | * multiply and shift. |
449 | */ |
450 | #define S27_TO_NS_SHIFT (27) |
451 | #define NS_TO_S27_MULT (((1ULL << 63) + NSEC_PER_SEC / 2) / NSEC_PER_SEC) |
452 | #define NS_TO_S27_SHIFT (63 - S27_TO_NS_SHIFT) |
453 | #define S27_MINOR_MAX (1 << S27_TO_NS_SHIFT) |
454 | |
455 | /* For Huntington platforms NIC time is in seconds and fractions of a second |
456 | * where the minor register only uses 27 bits in units of 2^-27s. |
457 | */ |
458 | static void efx_ptp_ns_to_s27(s64 ns, u32 *nic_major, u32 *nic_minor) |
459 | { |
460 | struct timespec64 ts = ns_to_timespec64(nsec: ns); |
461 | u32 maj = (u32)ts.tv_sec; |
462 | u32 min = (u32)(((u64)ts.tv_nsec * NS_TO_S27_MULT + |
463 | (1ULL << (NS_TO_S27_SHIFT - 1))) >> NS_TO_S27_SHIFT); |
464 | |
465 | /* The conversion can result in the minor value exceeding the maximum. |
466 | * In this case, round up to the next second. |
467 | */ |
468 | if (min >= S27_MINOR_MAX) { |
469 | min -= S27_MINOR_MAX; |
470 | maj++; |
471 | } |
472 | |
473 | *nic_major = maj; |
474 | *nic_minor = min; |
475 | } |
476 | |
477 | static inline ktime_t efx_ptp_s27_to_ktime(u32 nic_major, u32 nic_minor) |
478 | { |
479 | u32 ns = (u32)(((u64)nic_minor * NSEC_PER_SEC + |
480 | (1ULL << (S27_TO_NS_SHIFT - 1))) >> S27_TO_NS_SHIFT); |
481 | return ktime_set(secs: nic_major, nsecs: ns); |
482 | } |
483 | |
484 | static ktime_t efx_ptp_s27_to_ktime_correction(u32 nic_major, u32 nic_minor, |
485 | s32 correction) |
486 | { |
487 | /* Apply the correction and deal with carry */ |
488 | nic_minor += correction; |
489 | if ((s32)nic_minor < 0) { |
490 | nic_minor += S27_MINOR_MAX; |
491 | nic_major--; |
492 | } else if (nic_minor >= S27_MINOR_MAX) { |
493 | nic_minor -= S27_MINOR_MAX; |
494 | nic_major++; |
495 | } |
496 | |
497 | return efx_ptp_s27_to_ktime(nic_major, nic_minor); |
498 | } |
499 | |
500 | /* For Medford2 platforms the time is in seconds and quarter nanoseconds. */ |
501 | static void efx_ptp_ns_to_s_qns(s64 ns, u32 *nic_major, u32 *nic_minor) |
502 | { |
503 | struct timespec64 ts = ns_to_timespec64(nsec: ns); |
504 | |
505 | *nic_major = (u32)ts.tv_sec; |
506 | *nic_minor = ts.tv_nsec * 4; |
507 | } |
508 | |
509 | static ktime_t efx_ptp_s_qns_to_ktime_correction(u32 nic_major, u32 nic_minor, |
510 | s32 correction) |
511 | { |
512 | ktime_t kt; |
513 | |
514 | nic_minor = DIV_ROUND_CLOSEST(nic_minor, 4); |
515 | correction = DIV_ROUND_CLOSEST(correction, 4); |
516 | |
517 | kt = ktime_set(secs: nic_major, nsecs: nic_minor); |
518 | |
519 | if (correction >= 0) |
520 | kt = ktime_add_ns(kt, (u64)correction); |
521 | else |
522 | kt = ktime_sub_ns(kt, (u64)-correction); |
523 | return kt; |
524 | } |
525 | |
526 | struct efx_channel *efx_ptp_channel(struct efx_nic *efx) |
527 | { |
528 | return efx->ptp_data ? efx->ptp_data->channel : NULL; |
529 | } |
530 | |
531 | void efx_ptp_update_channel(struct efx_nic *efx, struct efx_channel *channel) |
532 | { |
533 | if (efx->ptp_data) |
534 | efx->ptp_data->channel = channel; |
535 | } |
536 | |
537 | static u32 last_sync_timestamp_major(struct efx_nic *efx) |
538 | { |
539 | struct efx_channel *channel = efx_ptp_channel(efx); |
540 | u32 major = 0; |
541 | |
542 | if (channel) |
543 | major = channel->sync_timestamp_major; |
544 | return major; |
545 | } |
546 | |
547 | /* The 8000 series and later can provide the time from the MAC, which is only |
548 | * 48 bits long and provides meta-information in the top 2 bits. |
549 | */ |
550 | static ktime_t |
551 | efx_ptp_mac_nic_to_ktime_correction(struct efx_nic *efx, |
552 | struct efx_ptp_data *ptp, |
553 | u32 nic_major, u32 nic_minor, |
554 | s32 correction) |
555 | { |
556 | u32 sync_timestamp; |
557 | ktime_t kt = { 0 }; |
558 | s16 delta; |
559 | |
560 | if (!(nic_major & 0x80000000)) { |
561 | WARN_ON_ONCE(nic_major >> 16); |
562 | |
563 | /* Medford provides 48 bits of timestamp, so we must get the top |
564 | * 16 bits from the timesync event state. |
565 | * |
566 | * We only have the lower 16 bits of the time now, but we do |
567 | * have a full resolution timestamp at some point in past. As |
568 | * long as the difference between the (real) now and the sync |
569 | * is less than 2^15, then we can reconstruct the difference |
570 | * between those two numbers using only the lower 16 bits of |
571 | * each. |
572 | * |
573 | * Put another way |
574 | * |
575 | * a - b = ((a mod k) - b) mod k |
576 | * |
577 | * when -k/2 < (a-b) < k/2. In our case k is 2^16. We know |
578 | * (a mod k) and b, so can calculate the delta, a - b. |
579 | * |
580 | */ |
581 | sync_timestamp = last_sync_timestamp_major(efx); |
582 | |
583 | /* Because delta is s16 this does an implicit mask down to |
584 | * 16 bits which is what we need, assuming |
585 | * MEDFORD_TX_SECS_EVENT_BITS is 16. delta is signed so that |
586 | * we can deal with the (unlikely) case of sync timestamps |
587 | * arriving from the future. |
588 | */ |
589 | delta = nic_major - sync_timestamp; |
590 | |
591 | /* Recover the fully specified time now, by applying the offset |
592 | * to the (fully specified) sync time. |
593 | */ |
594 | nic_major = sync_timestamp + delta; |
595 | |
596 | kt = ptp->nic_to_kernel_time(nic_major, nic_minor, |
597 | correction); |
598 | } |
599 | return kt; |
600 | } |
601 | |
602 | ktime_t efx_ptp_nic_to_kernel_time(struct efx_tx_queue *tx_queue) |
603 | { |
604 | struct efx_nic *efx = tx_queue->efx; |
605 | struct efx_ptp_data *ptp = efx->ptp_data; |
606 | ktime_t kt; |
607 | |
608 | if (efx_ptp_use_mac_tx_timestamps(efx)) |
609 | kt = efx_ptp_mac_nic_to_ktime_correction(efx, ptp, |
610 | nic_major: tx_queue->completed_timestamp_major, |
611 | nic_minor: tx_queue->completed_timestamp_minor, |
612 | correction: ptp->ts_corrections.general_tx); |
613 | else |
614 | kt = ptp->nic_to_kernel_time( |
615 | tx_queue->completed_timestamp_major, |
616 | tx_queue->completed_timestamp_minor, |
617 | ptp->ts_corrections.general_tx); |
618 | return kt; |
619 | } |
620 | |
621 | /* Get PTP attributes and set up time conversions */ |
622 | static int efx_ptp_get_attributes(struct efx_nic *efx) |
623 | { |
624 | MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_GET_ATTRIBUTES_LEN); |
625 | MCDI_DECLARE_BUF(outbuf, MC_CMD_PTP_OUT_GET_ATTRIBUTES_LEN); |
626 | struct efx_ptp_data *ptp = efx->ptp_data; |
627 | int rc; |
628 | u32 fmt; |
629 | size_t out_len; |
630 | |
631 | /* Get the PTP attributes. If the NIC doesn't support the operation we |
632 | * use the default format for compatibility with older NICs i.e. |
633 | * seconds and nanoseconds. |
634 | */ |
635 | MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_GET_ATTRIBUTES); |
636 | MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0); |
637 | rc = efx_mcdi_rpc_quiet(efx, MC_CMD_PTP, inbuf, inlen: sizeof(inbuf), |
638 | outbuf, outlen: sizeof(outbuf), outlen_actual: &out_len); |
639 | if (rc == 0) { |
640 | fmt = MCDI_DWORD(outbuf, PTP_OUT_GET_ATTRIBUTES_TIME_FORMAT); |
641 | } else if (rc == -EINVAL) { |
642 | fmt = MC_CMD_PTP_OUT_GET_ATTRIBUTES_SECONDS_NANOSECONDS; |
643 | } else if (rc == -EPERM) { |
644 | pci_info(efx->pci_dev, "no PTP support\n" ); |
645 | return rc; |
646 | } else { |
647 | efx_mcdi_display_error(efx, MC_CMD_PTP, inlen: sizeof(inbuf), |
648 | outbuf, outlen: sizeof(outbuf), rc); |
649 | return rc; |
650 | } |
651 | |
652 | switch (fmt) { |
653 | case MC_CMD_PTP_OUT_GET_ATTRIBUTES_SECONDS_27FRACTION: |
654 | ptp->ns_to_nic_time = efx_ptp_ns_to_s27; |
655 | ptp->nic_to_kernel_time = efx_ptp_s27_to_ktime_correction; |
656 | ptp->nic_time.minor_max = 1 << 27; |
657 | ptp->nic_time.sync_event_minor_shift = 19; |
658 | break; |
659 | case MC_CMD_PTP_OUT_GET_ATTRIBUTES_SECONDS_QTR_NANOSECONDS: |
660 | ptp->ns_to_nic_time = efx_ptp_ns_to_s_qns; |
661 | ptp->nic_to_kernel_time = efx_ptp_s_qns_to_ktime_correction; |
662 | ptp->nic_time.minor_max = 4000000000UL; |
663 | ptp->nic_time.sync_event_minor_shift = 24; |
664 | break; |
665 | default: |
666 | return -ERANGE; |
667 | } |
668 | |
669 | /* Precalculate acceptable difference between the minor time in the |
670 | * packet prefix and the last MCDI time sync event. We expect the |
671 | * packet prefix timestamp to be after of sync event by up to one |
672 | * sync event interval (0.25s) but we allow it to exceed this by a |
673 | * fuzz factor of (0.1s) |
674 | */ |
675 | ptp->nic_time.sync_event_diff_min = ptp->nic_time.minor_max |
676 | - (ptp->nic_time.minor_max / 10); |
677 | ptp->nic_time.sync_event_diff_max = (ptp->nic_time.minor_max / 4) |
678 | + (ptp->nic_time.minor_max / 10); |
679 | |
680 | /* MC_CMD_PTP_OP_GET_ATTRIBUTES has been extended twice from an older |
681 | * operation MC_CMD_PTP_OP_GET_TIME_FORMAT. The function now may return |
682 | * a value to use for the minimum acceptable corrected synchronization |
683 | * window and may return further capabilities. |
684 | * If we have the extra information store it. For older firmware that |
685 | * does not implement the extended command use the default value. |
686 | */ |
687 | if (rc == 0 && |
688 | out_len >= MC_CMD_PTP_OUT_GET_ATTRIBUTES_CAPABILITIES_OFST) |
689 | ptp->min_synchronisation_ns = |
690 | MCDI_DWORD(outbuf, |
691 | PTP_OUT_GET_ATTRIBUTES_SYNC_WINDOW_MIN); |
692 | else |
693 | ptp->min_synchronisation_ns = DEFAULT_MIN_SYNCHRONISATION_NS; |
694 | |
695 | if (rc == 0 && |
696 | out_len >= MC_CMD_PTP_OUT_GET_ATTRIBUTES_LEN) |
697 | ptp->capabilities = MCDI_DWORD(outbuf, |
698 | PTP_OUT_GET_ATTRIBUTES_CAPABILITIES); |
699 | else |
700 | ptp->capabilities = 0; |
701 | |
702 | /* Set up the shift for conversion between frequency |
703 | * adjustments in parts-per-billion and the fixed-point |
704 | * fractional ns format that the adapter uses. |
705 | */ |
706 | if (ptp->capabilities & (1 << MC_CMD_PTP_OUT_GET_ATTRIBUTES_FP44_FREQ_ADJ_LBN)) |
707 | ptp->adjfreq_ppb_shift = PPB_SHIFT_FP44; |
708 | else |
709 | ptp->adjfreq_ppb_shift = PPB_SHIFT_FP40; |
710 | |
711 | return 0; |
712 | } |
713 | |
714 | /* Get PTP timestamp corrections */ |
715 | static int efx_ptp_get_timestamp_corrections(struct efx_nic *efx) |
716 | { |
717 | MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_GET_TIMESTAMP_CORRECTIONS_LEN); |
718 | MCDI_DECLARE_BUF(outbuf, MC_CMD_PTP_OUT_GET_TIMESTAMP_CORRECTIONS_V2_LEN); |
719 | int rc; |
720 | size_t out_len; |
721 | |
722 | /* Get the timestamp corrections from the NIC. If this operation is |
723 | * not supported (older NICs) then no correction is required. |
724 | */ |
725 | MCDI_SET_DWORD(inbuf, PTP_IN_OP, |
726 | MC_CMD_PTP_OP_GET_TIMESTAMP_CORRECTIONS); |
727 | MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0); |
728 | |
729 | rc = efx_mcdi_rpc_quiet(efx, MC_CMD_PTP, inbuf, inlen: sizeof(inbuf), |
730 | outbuf, outlen: sizeof(outbuf), outlen_actual: &out_len); |
731 | if (rc == 0) { |
732 | efx->ptp_data->ts_corrections.ptp_tx = MCDI_DWORD(outbuf, |
733 | PTP_OUT_GET_TIMESTAMP_CORRECTIONS_TRANSMIT); |
734 | efx->ptp_data->ts_corrections.ptp_rx = MCDI_DWORD(outbuf, |
735 | PTP_OUT_GET_TIMESTAMP_CORRECTIONS_RECEIVE); |
736 | efx->ptp_data->ts_corrections.pps_out = MCDI_DWORD(outbuf, |
737 | PTP_OUT_GET_TIMESTAMP_CORRECTIONS_PPS_OUT); |
738 | efx->ptp_data->ts_corrections.pps_in = MCDI_DWORD(outbuf, |
739 | PTP_OUT_GET_TIMESTAMP_CORRECTIONS_PPS_IN); |
740 | |
741 | if (out_len >= MC_CMD_PTP_OUT_GET_TIMESTAMP_CORRECTIONS_V2_LEN) { |
742 | efx->ptp_data->ts_corrections.general_tx = MCDI_DWORD( |
743 | outbuf, |
744 | PTP_OUT_GET_TIMESTAMP_CORRECTIONS_V2_GENERAL_TX); |
745 | efx->ptp_data->ts_corrections.general_rx = MCDI_DWORD( |
746 | outbuf, |
747 | PTP_OUT_GET_TIMESTAMP_CORRECTIONS_V2_GENERAL_RX); |
748 | } else { |
749 | efx->ptp_data->ts_corrections.general_tx = |
750 | efx->ptp_data->ts_corrections.ptp_tx; |
751 | efx->ptp_data->ts_corrections.general_rx = |
752 | efx->ptp_data->ts_corrections.ptp_rx; |
753 | } |
754 | } else if (rc == -EINVAL) { |
755 | efx->ptp_data->ts_corrections.ptp_tx = 0; |
756 | efx->ptp_data->ts_corrections.ptp_rx = 0; |
757 | efx->ptp_data->ts_corrections.pps_out = 0; |
758 | efx->ptp_data->ts_corrections.pps_in = 0; |
759 | efx->ptp_data->ts_corrections.general_tx = 0; |
760 | efx->ptp_data->ts_corrections.general_rx = 0; |
761 | } else { |
762 | efx_mcdi_display_error(efx, MC_CMD_PTP, inlen: sizeof(inbuf), outbuf, |
763 | outlen: sizeof(outbuf), rc); |
764 | return rc; |
765 | } |
766 | |
767 | return 0; |
768 | } |
769 | |
770 | /* Enable MCDI PTP support. */ |
771 | static int efx_ptp_enable(struct efx_nic *efx) |
772 | { |
773 | MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_ENABLE_LEN); |
774 | MCDI_DECLARE_BUF_ERR(outbuf); |
775 | int rc; |
776 | |
777 | MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_ENABLE); |
778 | MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0); |
779 | MCDI_SET_DWORD(inbuf, PTP_IN_ENABLE_QUEUE, |
780 | efx->ptp_data->channel ? |
781 | efx->ptp_data->channel->channel : 0); |
782 | MCDI_SET_DWORD(inbuf, PTP_IN_ENABLE_MODE, efx->ptp_data->mode); |
783 | |
784 | rc = efx_mcdi_rpc_quiet(efx, MC_CMD_PTP, inbuf, inlen: sizeof(inbuf), |
785 | outbuf, outlen: sizeof(outbuf), NULL); |
786 | rc = (rc == -EALREADY) ? 0 : rc; |
787 | if (rc) |
788 | efx_mcdi_display_error(efx, MC_CMD_PTP, |
789 | MC_CMD_PTP_IN_ENABLE_LEN, |
790 | outbuf, outlen: sizeof(outbuf), rc); |
791 | return rc; |
792 | } |
793 | |
794 | /* Disable MCDI PTP support. |
795 | * |
796 | * Note that this function should never rely on the presence of ptp_data - |
797 | * may be called before that exists. |
798 | */ |
799 | static int efx_ptp_disable(struct efx_nic *efx) |
800 | { |
801 | MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_DISABLE_LEN); |
802 | MCDI_DECLARE_BUF_ERR(outbuf); |
803 | int rc; |
804 | |
805 | MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_DISABLE); |
806 | MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0); |
807 | rc = efx_mcdi_rpc_quiet(efx, MC_CMD_PTP, inbuf, inlen: sizeof(inbuf), |
808 | outbuf, outlen: sizeof(outbuf), NULL); |
809 | rc = (rc == -EALREADY) ? 0 : rc; |
810 | /* If we get ENOSYS, the NIC doesn't support PTP, and thus this function |
811 | * should only have been called during probe. |
812 | */ |
813 | if (rc == -ENOSYS || rc == -EPERM) |
814 | pci_info(efx->pci_dev, "no PTP support\n" ); |
815 | else if (rc) |
816 | efx_mcdi_display_error(efx, MC_CMD_PTP, |
817 | MC_CMD_PTP_IN_DISABLE_LEN, |
818 | outbuf, outlen: sizeof(outbuf), rc); |
819 | return rc; |
820 | } |
821 | |
822 | static void efx_ptp_deliver_rx_queue(struct sk_buff_head *q) |
823 | { |
824 | struct sk_buff *skb; |
825 | |
826 | while ((skb = skb_dequeue(list: q))) { |
827 | local_bh_disable(); |
828 | netif_receive_skb(skb); |
829 | local_bh_enable(); |
830 | } |
831 | } |
832 | |
833 | static void efx_ptp_handle_no_channel(struct efx_nic *efx) |
834 | { |
835 | netif_err(efx, drv, efx->net_dev, |
836 | "ERROR: PTP requires MSI-X and 1 additional interrupt" |
837 | "vector. PTP disabled\n" ); |
838 | } |
839 | |
840 | /* Repeatedly send the host time to the MC which will capture the hardware |
841 | * time. |
842 | */ |
843 | static void efx_ptp_send_times(struct efx_nic *efx, |
844 | struct pps_event_time *last_time) |
845 | { |
846 | struct pps_event_time now; |
847 | struct timespec64 limit; |
848 | struct efx_ptp_data *ptp = efx->ptp_data; |
849 | int *mc_running = ptp->start.addr; |
850 | |
851 | pps_get_ts(ts: &now); |
852 | limit = now.ts_real; |
853 | timespec64_add_ns(a: &limit, SYNCHRONISE_PERIOD_NS); |
854 | |
855 | /* Write host time for specified period or until MC is done */ |
856 | while ((timespec64_compare(lhs: &now.ts_real, rhs: &limit) < 0) && |
857 | READ_ONCE(*mc_running)) { |
858 | struct timespec64 update_time; |
859 | unsigned int host_time; |
860 | |
861 | /* Don't update continuously to avoid saturating the PCIe bus */ |
862 | update_time = now.ts_real; |
863 | timespec64_add_ns(a: &update_time, SYNCHRONISATION_GRANULARITY_NS); |
864 | do { |
865 | pps_get_ts(ts: &now); |
866 | } while ((timespec64_compare(lhs: &now.ts_real, rhs: &update_time) < 0) && |
867 | READ_ONCE(*mc_running)); |
868 | |
869 | /* Synchronise NIC with single word of time only */ |
870 | host_time = (now.ts_real.tv_sec << MC_NANOSECOND_BITS | |
871 | now.ts_real.tv_nsec); |
872 | /* Update host time in NIC memory */ |
873 | efx->type->ptp_write_host_time(efx, host_time); |
874 | } |
875 | *last_time = now; |
876 | } |
877 | |
878 | /* Read a timeset from the MC's results and partial process. */ |
879 | static void efx_ptp_read_timeset(MCDI_DECLARE_STRUCT_PTR(data), |
880 | struct efx_ptp_timeset *timeset) |
881 | { |
882 | unsigned start_ns, end_ns; |
883 | |
884 | timeset->host_start = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_HOSTSTART); |
885 | timeset->major = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_MAJOR); |
886 | timeset->minor = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_MINOR); |
887 | timeset->host_end = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_HOSTEND), |
888 | timeset->wait = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_WAITNS); |
889 | |
890 | /* Ignore seconds */ |
891 | start_ns = timeset->host_start & MC_NANOSECOND_MASK; |
892 | end_ns = timeset->host_end & MC_NANOSECOND_MASK; |
893 | /* Allow for rollover */ |
894 | if (end_ns < start_ns) |
895 | end_ns += NSEC_PER_SEC; |
896 | /* Determine duration of operation */ |
897 | timeset->window = end_ns - start_ns; |
898 | } |
899 | |
900 | /* Process times received from MC. |
901 | * |
902 | * Extract times from returned results, and establish the minimum value |
903 | * seen. The minimum value represents the "best" possible time and events |
904 | * too much greater than this are rejected - the machine is, perhaps, too |
905 | * busy. A number of readings are taken so that, hopefully, at least one good |
906 | * synchronisation will be seen in the results. |
907 | */ |
908 | static int |
909 | efx_ptp_process_times(struct efx_nic *efx, MCDI_DECLARE_STRUCT_PTR(synch_buf), |
910 | size_t response_length, |
911 | const struct pps_event_time *last_time) |
912 | { |
913 | unsigned number_readings = |
914 | MCDI_VAR_ARRAY_LEN(response_length, |
915 | PTP_OUT_SYNCHRONIZE_TIMESET); |
916 | unsigned i; |
917 | unsigned ngood = 0; |
918 | unsigned last_good = 0; |
919 | struct efx_ptp_data *ptp = efx->ptp_data; |
920 | u32 last_sec; |
921 | u32 start_sec; |
922 | struct timespec64 delta; |
923 | ktime_t mc_time; |
924 | |
925 | if (number_readings == 0) |
926 | return -EAGAIN; |
927 | |
928 | /* Read the set of results and find the last good host-MC |
929 | * synchronization result. The MC times when it finishes reading the |
930 | * host time so the corrected window time should be fairly constant |
931 | * for a given platform. Increment stats for any results that appear |
932 | * to be erroneous. |
933 | */ |
934 | for (i = 0; i < number_readings; i++) { |
935 | s32 window, corrected; |
936 | struct timespec64 wait; |
937 | |
938 | efx_ptp_read_timeset( |
939 | MCDI_ARRAY_STRUCT_PTR(synch_buf, |
940 | PTP_OUT_SYNCHRONIZE_TIMESET, i), |
941 | timeset: &ptp->timeset[i]); |
942 | |
943 | wait = ktime_to_timespec64( |
944 | ptp->nic_to_kernel_time(0, ptp->timeset[i].wait, 0)); |
945 | window = ptp->timeset[i].window; |
946 | corrected = window - wait.tv_nsec; |
947 | |
948 | /* We expect the uncorrected synchronization window to be at |
949 | * least as large as the interval between host start and end |
950 | * times. If it is smaller than this then this is mostly likely |
951 | * to be a consequence of the host's time being adjusted. |
952 | * Check that the corrected sync window is in a reasonable |
953 | * range. If it is out of range it is likely to be because an |
954 | * interrupt or other delay occurred between reading the system |
955 | * time and writing it to MC memory. |
956 | */ |
957 | if (window < SYNCHRONISATION_GRANULARITY_NS) { |
958 | ++ptp->invalid_sync_windows; |
959 | } else if (corrected >= MAX_SYNCHRONISATION_NS) { |
960 | ++ptp->oversize_sync_windows; |
961 | } else if (corrected < ptp->min_synchronisation_ns) { |
962 | ++ptp->undersize_sync_windows; |
963 | } else { |
964 | ngood++; |
965 | last_good = i; |
966 | } |
967 | } |
968 | |
969 | if (ngood == 0) { |
970 | netif_warn(efx, drv, efx->net_dev, |
971 | "PTP no suitable synchronisations\n" ); |
972 | return -EAGAIN; |
973 | } |
974 | |
975 | /* Calculate delay from last good sync (host time) to last_time. |
976 | * It is possible that the seconds rolled over between taking |
977 | * the start reading and the last value written by the host. The |
978 | * timescales are such that a gap of more than one second is never |
979 | * expected. delta is *not* normalised. |
980 | */ |
981 | start_sec = ptp->timeset[last_good].host_start >> MC_NANOSECOND_BITS; |
982 | last_sec = last_time->ts_real.tv_sec & MC_SECOND_MASK; |
983 | if (start_sec != last_sec && |
984 | ((start_sec + 1) & MC_SECOND_MASK) != last_sec) { |
985 | netif_warn(efx, hw, efx->net_dev, |
986 | "PTP bad synchronisation seconds\n" ); |
987 | return -EAGAIN; |
988 | } |
989 | delta.tv_sec = (last_sec - start_sec) & 1; |
990 | delta.tv_nsec = |
991 | last_time->ts_real.tv_nsec - |
992 | (ptp->timeset[last_good].host_start & MC_NANOSECOND_MASK); |
993 | |
994 | /* Convert the NIC time at last good sync into kernel time. |
995 | * No correction is required - this time is the output of a |
996 | * firmware process. |
997 | */ |
998 | mc_time = ptp->nic_to_kernel_time(ptp->timeset[last_good].major, |
999 | ptp->timeset[last_good].minor, 0); |
1000 | |
1001 | /* Calculate delay from NIC top of second to last_time */ |
1002 | delta.tv_nsec += ktime_to_timespec64(mc_time).tv_nsec; |
1003 | |
1004 | /* Set PPS timestamp to match NIC top of second */ |
1005 | ptp->host_time_pps = *last_time; |
1006 | pps_sub_ts(ts: &ptp->host_time_pps, delta); |
1007 | |
1008 | return 0; |
1009 | } |
1010 | |
1011 | /* Synchronize times between the host and the MC */ |
1012 | static int efx_ptp_synchronize(struct efx_nic *efx, unsigned int num_readings) |
1013 | { |
1014 | struct efx_ptp_data *ptp = efx->ptp_data; |
1015 | MCDI_DECLARE_BUF(synch_buf, MC_CMD_PTP_OUT_SYNCHRONIZE_LENMAX); |
1016 | size_t response_length; |
1017 | int rc; |
1018 | unsigned long timeout; |
1019 | struct pps_event_time last_time = {}; |
1020 | unsigned int loops = 0; |
1021 | int *start = ptp->start.addr; |
1022 | |
1023 | MCDI_SET_DWORD(synch_buf, PTP_IN_OP, MC_CMD_PTP_OP_SYNCHRONIZE); |
1024 | MCDI_SET_DWORD(synch_buf, PTP_IN_PERIPH_ID, 0); |
1025 | MCDI_SET_DWORD(synch_buf, PTP_IN_SYNCHRONIZE_NUMTIMESETS, |
1026 | num_readings); |
1027 | MCDI_SET_QWORD(synch_buf, PTP_IN_SYNCHRONIZE_START_ADDR, |
1028 | ptp->start.dma_addr); |
1029 | |
1030 | /* Clear flag that signals MC ready */ |
1031 | WRITE_ONCE(*start, 0); |
1032 | rc = efx_mcdi_rpc_start(efx, MC_CMD_PTP, inbuf: synch_buf, |
1033 | MC_CMD_PTP_IN_SYNCHRONIZE_LEN); |
1034 | EFX_WARN_ON_ONCE_PARANOID(rc); |
1035 | |
1036 | /* Wait for start from MCDI (or timeout) */ |
1037 | timeout = jiffies + msecs_to_jiffies(MAX_SYNCHRONISE_WAIT_MS); |
1038 | while (!READ_ONCE(*start) && (time_before(jiffies, timeout))) { |
1039 | udelay(20); /* Usually start MCDI execution quickly */ |
1040 | loops++; |
1041 | } |
1042 | |
1043 | if (loops <= 1) |
1044 | ++ptp->fast_syncs; |
1045 | if (!time_before(jiffies, timeout)) |
1046 | ++ptp->sync_timeouts; |
1047 | |
1048 | if (READ_ONCE(*start)) |
1049 | efx_ptp_send_times(efx, last_time: &last_time); |
1050 | |
1051 | /* Collect results */ |
1052 | rc = efx_mcdi_rpc_finish(efx, MC_CMD_PTP, |
1053 | MC_CMD_PTP_IN_SYNCHRONIZE_LEN, |
1054 | outbuf: synch_buf, outlen: sizeof(synch_buf), |
1055 | outlen_actual: &response_length); |
1056 | if (rc == 0) { |
1057 | rc = efx_ptp_process_times(efx, synch_buf, response_length, |
1058 | last_time: &last_time); |
1059 | if (rc == 0) |
1060 | ++ptp->good_syncs; |
1061 | else |
1062 | ++ptp->no_time_syncs; |
1063 | } |
1064 | |
1065 | /* Increment the bad syncs counter if the synchronize fails, whatever |
1066 | * the reason. |
1067 | */ |
1068 | if (rc != 0) |
1069 | ++ptp->bad_syncs; |
1070 | |
1071 | return rc; |
1072 | } |
1073 | |
1074 | /* Transmit a PTP packet via the dedicated hardware timestamped queue. */ |
1075 | static void efx_ptp_xmit_skb_queue(struct efx_nic *efx, struct sk_buff *skb) |
1076 | { |
1077 | struct efx_ptp_data *ptp_data = efx->ptp_data; |
1078 | u8 type = efx_tx_csum_type_skb(skb); |
1079 | struct efx_tx_queue *tx_queue; |
1080 | |
1081 | tx_queue = efx_channel_get_tx_queue(channel: ptp_data->channel, type); |
1082 | if (tx_queue && tx_queue->timestamping) { |
1083 | skb_get(skb); |
1084 | |
1085 | /* This code invokes normal driver TX code which is always |
1086 | * protected from softirqs when called from generic TX code, |
1087 | * which in turn disables preemption. Look at __dev_queue_xmit |
1088 | * which uses rcu_read_lock_bh disabling preemption for RCU |
1089 | * plus disabling softirqs. We do not need RCU reader |
1090 | * protection here. |
1091 | * |
1092 | * Although it is theoretically safe for current PTP TX/RX code |
1093 | * running without disabling softirqs, there are three good |
1094 | * reasond for doing so: |
1095 | * |
1096 | * 1) The code invoked is mainly implemented for non-PTP |
1097 | * packets and it is always executed with softirqs |
1098 | * disabled. |
1099 | * 2) This being a single PTP packet, better to not |
1100 | * interrupt its processing by softirqs which can lead |
1101 | * to high latencies. |
1102 | * 3) netdev_xmit_more checks preemption is disabled and |
1103 | * triggers a BUG_ON if not. |
1104 | */ |
1105 | local_bh_disable(); |
1106 | efx_enqueue_skb(tx_queue, skb); |
1107 | local_bh_enable(); |
1108 | |
1109 | /* We need to add the filters after enqueuing the packet. |
1110 | * Otherwise, there's high latency in sending back the |
1111 | * timestamp, causing ptp4l timeouts |
1112 | */ |
1113 | efx_ptp_insert_unicast_filter(efx, skb); |
1114 | dev_consume_skb_any(skb); |
1115 | } else { |
1116 | WARN_ONCE(1, "PTP channel has no timestamped tx queue\n" ); |
1117 | dev_kfree_skb_any(skb); |
1118 | } |
1119 | } |
1120 | |
1121 | /* Transmit a PTP packet, via the MCDI interface, to the wire. */ |
1122 | static void efx_ptp_xmit_skb_mc(struct efx_nic *efx, struct sk_buff *skb) |
1123 | { |
1124 | MCDI_DECLARE_BUF(txtime, MC_CMD_PTP_OUT_TRANSMIT_LEN); |
1125 | struct efx_ptp_data *ptp_data = efx->ptp_data; |
1126 | struct skb_shared_hwtstamps timestamps; |
1127 | size_t len; |
1128 | int rc; |
1129 | |
1130 | MCDI_SET_DWORD(ptp_data->txbuf, PTP_IN_OP, MC_CMD_PTP_OP_TRANSMIT); |
1131 | MCDI_SET_DWORD(ptp_data->txbuf, PTP_IN_PERIPH_ID, 0); |
1132 | MCDI_SET_DWORD(ptp_data->txbuf, PTP_IN_TRANSMIT_LENGTH, skb->len); |
1133 | if (skb_shinfo(skb)->nr_frags != 0) { |
1134 | rc = skb_linearize(skb); |
1135 | if (rc != 0) |
1136 | goto fail; |
1137 | } |
1138 | |
1139 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1140 | rc = skb_checksum_help(skb); |
1141 | if (rc != 0) |
1142 | goto fail; |
1143 | } |
1144 | skb_copy_from_linear_data(skb, |
1145 | MCDI_PTR(ptp_data->txbuf, |
1146 | PTP_IN_TRANSMIT_PACKET), |
1147 | len: skb->len); |
1148 | rc = efx_mcdi_rpc(efx, MC_CMD_PTP, |
1149 | inbuf: ptp_data->txbuf, MC_CMD_PTP_IN_TRANSMIT_LEN(skb->len), |
1150 | outbuf: txtime, outlen: sizeof(txtime), outlen_actual: &len); |
1151 | if (rc != 0) |
1152 | goto fail; |
1153 | |
1154 | memset(×tamps, 0, sizeof(timestamps)); |
1155 | timestamps.hwtstamp = ptp_data->nic_to_kernel_time( |
1156 | MCDI_DWORD(txtime, PTP_OUT_TRANSMIT_MAJOR), |
1157 | MCDI_DWORD(txtime, PTP_OUT_TRANSMIT_MINOR), |
1158 | ptp_data->ts_corrections.ptp_tx); |
1159 | |
1160 | skb_tstamp_tx(orig_skb: skb, hwtstamps: ×tamps); |
1161 | |
1162 | /* Add the filters after sending back the timestamp to avoid delaying it |
1163 | * or ptp4l may timeout. |
1164 | */ |
1165 | efx_ptp_insert_unicast_filter(efx, skb); |
1166 | |
1167 | fail: |
1168 | dev_kfree_skb_any(skb); |
1169 | |
1170 | return; |
1171 | } |
1172 | |
1173 | /* Process any queued receive events and corresponding packets |
1174 | * |
1175 | * q is returned with all the packets that are ready for delivery. |
1176 | */ |
1177 | static void efx_ptp_process_events(struct efx_nic *efx, struct sk_buff_head *q) |
1178 | { |
1179 | struct efx_ptp_data *ptp = efx->ptp_data; |
1180 | struct sk_buff *skb; |
1181 | |
1182 | while ((skb = skb_dequeue(list: &ptp->rxq))) { |
1183 | struct efx_ptp_match *match; |
1184 | |
1185 | match = (struct efx_ptp_match *)skb->cb; |
1186 | if (match->state == PTP_PACKET_STATE_MATCH_UNWANTED) { |
1187 | __skb_queue_tail(list: q, newsk: skb); |
1188 | } else if (time_after(jiffies, match->expiry)) { |
1189 | match->state = PTP_PACKET_STATE_TIMED_OUT; |
1190 | ++ptp->rx_no_timestamp; |
1191 | __skb_queue_tail(list: q, newsk: skb); |
1192 | } else { |
1193 | /* Replace unprocessed entry and stop */ |
1194 | skb_queue_head(list: &ptp->rxq, newsk: skb); |
1195 | break; |
1196 | } |
1197 | } |
1198 | } |
1199 | |
1200 | /* Complete processing of a received packet */ |
1201 | static inline void efx_ptp_process_rx(struct efx_nic *efx, struct sk_buff *skb) |
1202 | { |
1203 | local_bh_disable(); |
1204 | netif_receive_skb(skb); |
1205 | local_bh_enable(); |
1206 | } |
1207 | |
1208 | static struct efx_ptp_rxfilter * |
1209 | efx_ptp_find_filter(struct list_head *filter_list, struct efx_filter_spec *spec) |
1210 | { |
1211 | struct efx_ptp_rxfilter *rxfilter; |
1212 | |
1213 | list_for_each_entry(rxfilter, filter_list, list) { |
1214 | if (rxfilter->ether_type == spec->ether_type && |
1215 | rxfilter->loc_port == spec->loc_port && |
1216 | !memcmp(p: rxfilter->loc_host, q: spec->loc_host, size: sizeof(spec->loc_host))) |
1217 | return rxfilter; |
1218 | } |
1219 | |
1220 | return NULL; |
1221 | } |
1222 | |
1223 | static void efx_ptp_remove_one_filter(struct efx_nic *efx, |
1224 | struct efx_ptp_rxfilter *rxfilter) |
1225 | { |
1226 | efx_filter_remove_id_safe(efx, priority: EFX_FILTER_PRI_REQUIRED, |
1227 | filter_id: rxfilter->handle); |
1228 | list_del(entry: &rxfilter->list); |
1229 | kfree(objp: rxfilter); |
1230 | } |
1231 | |
1232 | static void efx_ptp_remove_filters(struct efx_nic *efx, |
1233 | struct list_head *filter_list) |
1234 | { |
1235 | struct efx_ptp_rxfilter *rxfilter, *tmp; |
1236 | |
1237 | list_for_each_entry_safe(rxfilter, tmp, filter_list, list) |
1238 | efx_ptp_remove_one_filter(efx, rxfilter); |
1239 | } |
1240 | |
1241 | static void efx_ptp_init_filter(struct efx_nic *efx, |
1242 | struct efx_filter_spec *rxfilter) |
1243 | { |
1244 | struct efx_channel *channel = efx->ptp_data->channel; |
1245 | struct efx_rx_queue *queue = efx_channel_get_rx_queue(channel); |
1246 | |
1247 | efx_filter_init_rx(spec: rxfilter, priority: EFX_FILTER_PRI_REQUIRED, flags: 0, |
1248 | rxq_id: efx_rx_queue_index(rx_queue: queue)); |
1249 | } |
1250 | |
1251 | static int efx_ptp_insert_filter(struct efx_nic *efx, |
1252 | struct list_head *filter_list, |
1253 | struct efx_filter_spec *spec, |
1254 | unsigned long expiry) |
1255 | { |
1256 | struct efx_ptp_data *ptp = efx->ptp_data; |
1257 | struct efx_ptp_rxfilter *rxfilter; |
1258 | int rc; |
1259 | |
1260 | rxfilter = efx_ptp_find_filter(filter_list, spec); |
1261 | if (rxfilter) { |
1262 | rxfilter->expiry = expiry; |
1263 | return 0; |
1264 | } |
1265 | |
1266 | rxfilter = kzalloc(size: sizeof(*rxfilter), GFP_KERNEL); |
1267 | if (!rxfilter) |
1268 | return -ENOMEM; |
1269 | |
1270 | rc = efx_filter_insert_filter(efx, spec, replace_equal: true); |
1271 | if (rc < 0) |
1272 | goto fail; |
1273 | |
1274 | rxfilter->handle = rc; |
1275 | rxfilter->ether_type = spec->ether_type; |
1276 | rxfilter->loc_port = spec->loc_port; |
1277 | memcpy(rxfilter->loc_host, spec->loc_host, sizeof(spec->loc_host)); |
1278 | rxfilter->expiry = expiry; |
1279 | list_add(new: &rxfilter->list, head: filter_list); |
1280 | |
1281 | queue_delayed_work(wq: ptp->workwq, dwork: &ptp->cleanup_work, |
1282 | UCAST_FILTER_EXPIRY_JIFFIES + 1); |
1283 | |
1284 | return 0; |
1285 | |
1286 | fail: |
1287 | kfree(objp: rxfilter); |
1288 | return rc; |
1289 | } |
1290 | |
1291 | static int efx_ptp_insert_ipv4_filter(struct efx_nic *efx, |
1292 | struct list_head *filter_list, |
1293 | __be32 addr, u16 port, |
1294 | unsigned long expiry) |
1295 | { |
1296 | struct efx_filter_spec spec; |
1297 | |
1298 | efx_ptp_init_filter(efx, rxfilter: &spec); |
1299 | efx_filter_set_ipv4_local(spec: &spec, IPPROTO_UDP, host: addr, htons(port)); |
1300 | return efx_ptp_insert_filter(efx, filter_list, spec: &spec, expiry); |
1301 | } |
1302 | |
1303 | static int efx_ptp_insert_ipv6_filter(struct efx_nic *efx, |
1304 | struct list_head *filter_list, |
1305 | const struct in6_addr *addr, u16 port, |
1306 | unsigned long expiry) |
1307 | { |
1308 | struct efx_filter_spec spec; |
1309 | |
1310 | efx_ptp_init_filter(efx, rxfilter: &spec); |
1311 | efx_filter_set_ipv6_local(spec: &spec, IPPROTO_UDP, host: addr, htons(port)); |
1312 | return efx_ptp_insert_filter(efx, filter_list, spec: &spec, expiry); |
1313 | } |
1314 | |
1315 | static int efx_ptp_insert_eth_multicast_filter(struct efx_nic *efx) |
1316 | { |
1317 | struct efx_ptp_data *ptp = efx->ptp_data; |
1318 | struct efx_filter_spec spec; |
1319 | |
1320 | efx_ptp_init_filter(efx, rxfilter: &spec); |
1321 | efx_filter_set_eth_local(spec: &spec, vid: EFX_FILTER_VID_UNSPEC, addr: ptp_addr_ether); |
1322 | spec.match_flags |= EFX_FILTER_MATCH_ETHER_TYPE; |
1323 | spec.ether_type = htons(ETH_P_1588); |
1324 | return efx_ptp_insert_filter(efx, filter_list: &ptp->rxfilters_mcast, spec: &spec, expiry: 0); |
1325 | } |
1326 | |
1327 | static int efx_ptp_insert_multicast_filters(struct efx_nic *efx) |
1328 | { |
1329 | struct efx_ptp_data *ptp = efx->ptp_data; |
1330 | int rc; |
1331 | |
1332 | if (!ptp->channel || !list_empty(head: &ptp->rxfilters_mcast)) |
1333 | return 0; |
1334 | |
1335 | /* Must filter on both event and general ports to ensure |
1336 | * that there is no packet re-ordering. |
1337 | */ |
1338 | rc = efx_ptp_insert_ipv4_filter(efx, filter_list: &ptp->rxfilters_mcast, |
1339 | htonl(PTP_ADDR_IPV4), PTP_EVENT_PORT, |
1340 | expiry: 0); |
1341 | if (rc < 0) |
1342 | goto fail; |
1343 | |
1344 | rc = efx_ptp_insert_ipv4_filter(efx, filter_list: &ptp->rxfilters_mcast, |
1345 | htonl(PTP_ADDR_IPV4), PTP_GENERAL_PORT, |
1346 | expiry: 0); |
1347 | if (rc < 0) |
1348 | goto fail; |
1349 | |
1350 | /* if the NIC supports hw timestamps by the MAC, we can support |
1351 | * PTP over IPv6 and Ethernet |
1352 | */ |
1353 | if (efx_ptp_use_mac_tx_timestamps(efx)) { |
1354 | rc = efx_ptp_insert_ipv6_filter(efx, filter_list: &ptp->rxfilters_mcast, |
1355 | addr: &ptp_addr_ipv6, PTP_EVENT_PORT, expiry: 0); |
1356 | if (rc < 0) |
1357 | goto fail; |
1358 | |
1359 | rc = efx_ptp_insert_ipv6_filter(efx, filter_list: &ptp->rxfilters_mcast, |
1360 | addr: &ptp_addr_ipv6, PTP_GENERAL_PORT, expiry: 0); |
1361 | if (rc < 0) |
1362 | goto fail; |
1363 | |
1364 | rc = efx_ptp_insert_eth_multicast_filter(efx); |
1365 | |
1366 | /* Not all firmware variants support this filter */ |
1367 | if (rc < 0 && rc != -EPROTONOSUPPORT) |
1368 | goto fail; |
1369 | } |
1370 | |
1371 | return 0; |
1372 | |
1373 | fail: |
1374 | efx_ptp_remove_filters(efx, filter_list: &ptp->rxfilters_mcast); |
1375 | return rc; |
1376 | } |
1377 | |
1378 | static bool efx_ptp_valid_unicast_event_pkt(struct sk_buff *skb) |
1379 | { |
1380 | if (skb->protocol == htons(ETH_P_IP)) { |
1381 | return ip_hdr(skb)->daddr != htonl(PTP_ADDR_IPV4) && |
1382 | ip_hdr(skb)->protocol == IPPROTO_UDP && |
1383 | udp_hdr(skb)->source == htons(PTP_EVENT_PORT); |
1384 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
1385 | return !ipv6_addr_equal(a1: &ipv6_hdr(skb)->daddr, a2: &ptp_addr_ipv6) && |
1386 | ipv6_hdr(skb)->nexthdr == IPPROTO_UDP && |
1387 | udp_hdr(skb)->source == htons(PTP_EVENT_PORT); |
1388 | } |
1389 | return false; |
1390 | } |
1391 | |
1392 | static int efx_ptp_insert_unicast_filter(struct efx_nic *efx, |
1393 | struct sk_buff *skb) |
1394 | { |
1395 | struct efx_ptp_data *ptp = efx->ptp_data; |
1396 | unsigned long expiry; |
1397 | int rc; |
1398 | |
1399 | if (!efx_ptp_valid_unicast_event_pkt(skb)) |
1400 | return -EINVAL; |
1401 | |
1402 | expiry = jiffies + UCAST_FILTER_EXPIRY_JIFFIES; |
1403 | |
1404 | if (skb->protocol == htons(ETH_P_IP)) { |
1405 | __be32 addr = ip_hdr(skb)->saddr; |
1406 | |
1407 | rc = efx_ptp_insert_ipv4_filter(efx, filter_list: &ptp->rxfilters_ucast, |
1408 | addr, PTP_EVENT_PORT, expiry); |
1409 | if (rc < 0) |
1410 | goto out; |
1411 | |
1412 | rc = efx_ptp_insert_ipv4_filter(efx, filter_list: &ptp->rxfilters_ucast, |
1413 | addr, PTP_GENERAL_PORT, expiry); |
1414 | } else if (efx_ptp_use_mac_tx_timestamps(efx)) { |
1415 | /* IPv6 PTP only supported by devices with MAC hw timestamp */ |
1416 | struct in6_addr *addr = &ipv6_hdr(skb)->saddr; |
1417 | |
1418 | rc = efx_ptp_insert_ipv6_filter(efx, filter_list: &ptp->rxfilters_ucast, |
1419 | addr, PTP_EVENT_PORT, expiry); |
1420 | if (rc < 0) |
1421 | goto out; |
1422 | |
1423 | rc = efx_ptp_insert_ipv6_filter(efx, filter_list: &ptp->rxfilters_ucast, |
1424 | addr, PTP_GENERAL_PORT, expiry); |
1425 | } else { |
1426 | return -EOPNOTSUPP; |
1427 | } |
1428 | |
1429 | out: |
1430 | return rc; |
1431 | } |
1432 | |
1433 | static int efx_ptp_start(struct efx_nic *efx) |
1434 | { |
1435 | struct efx_ptp_data *ptp = efx->ptp_data; |
1436 | int rc; |
1437 | |
1438 | ptp->reset_required = false; |
1439 | |
1440 | rc = efx_ptp_insert_multicast_filters(efx); |
1441 | if (rc) |
1442 | return rc; |
1443 | |
1444 | rc = efx_ptp_enable(efx); |
1445 | if (rc != 0) |
1446 | goto fail; |
1447 | |
1448 | ptp->evt_frag_idx = 0; |
1449 | ptp->current_adjfreq = 0; |
1450 | |
1451 | return 0; |
1452 | |
1453 | fail: |
1454 | efx_ptp_remove_filters(efx, filter_list: &ptp->rxfilters_mcast); |
1455 | return rc; |
1456 | } |
1457 | |
1458 | static int efx_ptp_stop(struct efx_nic *efx) |
1459 | { |
1460 | struct efx_ptp_data *ptp = efx->ptp_data; |
1461 | int rc; |
1462 | |
1463 | if (ptp == NULL) |
1464 | return 0; |
1465 | |
1466 | rc = efx_ptp_disable(efx); |
1467 | |
1468 | efx_ptp_remove_filters(efx, filter_list: &ptp->rxfilters_mcast); |
1469 | efx_ptp_remove_filters(efx, filter_list: &ptp->rxfilters_ucast); |
1470 | |
1471 | /* Make sure RX packets are really delivered */ |
1472 | efx_ptp_deliver_rx_queue(q: &efx->ptp_data->rxq); |
1473 | skb_queue_purge(list: &efx->ptp_data->txq); |
1474 | |
1475 | return rc; |
1476 | } |
1477 | |
1478 | static int efx_ptp_restart(struct efx_nic *efx) |
1479 | { |
1480 | if (efx->ptp_data && efx->ptp_data->enabled) |
1481 | return efx_ptp_start(efx); |
1482 | return 0; |
1483 | } |
1484 | |
1485 | static void efx_ptp_pps_worker(struct work_struct *work) |
1486 | { |
1487 | struct efx_ptp_data *ptp = |
1488 | container_of(work, struct efx_ptp_data, pps_work); |
1489 | struct efx_nic *efx = ptp->efx; |
1490 | struct ptp_clock_event ptp_evt; |
1491 | |
1492 | if (efx_ptp_synchronize(efx, PTP_SYNC_ATTEMPTS)) |
1493 | return; |
1494 | |
1495 | ptp_evt.type = PTP_CLOCK_PPSUSR; |
1496 | ptp_evt.pps_times = ptp->host_time_pps; |
1497 | ptp_clock_event(ptp: ptp->phc_clock, event: &ptp_evt); |
1498 | } |
1499 | |
1500 | static void efx_ptp_worker(struct work_struct *work) |
1501 | { |
1502 | struct efx_ptp_data *ptp_data = |
1503 | container_of(work, struct efx_ptp_data, work); |
1504 | struct efx_nic *efx = ptp_data->efx; |
1505 | struct sk_buff *skb; |
1506 | struct sk_buff_head tempq; |
1507 | |
1508 | if (ptp_data->reset_required) { |
1509 | efx_ptp_stop(efx); |
1510 | efx_ptp_start(efx); |
1511 | return; |
1512 | } |
1513 | |
1514 | __skb_queue_head_init(list: &tempq); |
1515 | efx_ptp_process_events(efx, q: &tempq); |
1516 | |
1517 | while ((skb = skb_dequeue(list: &ptp_data->txq))) |
1518 | ptp_data->xmit_skb(efx, skb); |
1519 | |
1520 | while ((skb = __skb_dequeue(list: &tempq))) |
1521 | efx_ptp_process_rx(efx, skb); |
1522 | } |
1523 | |
1524 | static void efx_ptp_cleanup_worker(struct work_struct *work) |
1525 | { |
1526 | struct efx_ptp_data *ptp = |
1527 | container_of(work, struct efx_ptp_data, cleanup_work.work); |
1528 | struct efx_ptp_rxfilter *rxfilter, *tmp; |
1529 | |
1530 | list_for_each_entry_safe(rxfilter, tmp, &ptp->rxfilters_ucast, list) { |
1531 | if (time_is_before_jiffies(rxfilter->expiry)) |
1532 | efx_ptp_remove_one_filter(efx: ptp->efx, rxfilter); |
1533 | } |
1534 | |
1535 | if (!list_empty(head: &ptp->rxfilters_ucast)) { |
1536 | queue_delayed_work(wq: ptp->workwq, dwork: &ptp->cleanup_work, |
1537 | UCAST_FILTER_EXPIRY_JIFFIES + 1); |
1538 | } |
1539 | } |
1540 | |
1541 | static const struct ptp_clock_info efx_phc_clock_info = { |
1542 | .owner = THIS_MODULE, |
1543 | .name = "sfc" , |
1544 | .max_adj = MAX_PPB, |
1545 | .n_alarm = 0, |
1546 | .n_ext_ts = 0, |
1547 | .n_per_out = 0, |
1548 | .n_pins = 0, |
1549 | .pps = 1, |
1550 | .adjfine = efx_phc_adjfine, |
1551 | .adjtime = efx_phc_adjtime, |
1552 | .gettime64 = efx_phc_gettime, |
1553 | .settime64 = efx_phc_settime, |
1554 | .enable = efx_phc_enable, |
1555 | }; |
1556 | |
1557 | /* Initialise PTP state. */ |
1558 | int efx_ptp_probe(struct efx_nic *efx, struct efx_channel *channel) |
1559 | { |
1560 | struct efx_ptp_data *ptp; |
1561 | int rc = 0; |
1562 | |
1563 | if (efx->ptp_data) { |
1564 | efx->ptp_data->channel = channel; |
1565 | return 0; |
1566 | } |
1567 | |
1568 | ptp = kzalloc(size: sizeof(struct efx_ptp_data), GFP_KERNEL); |
1569 | efx->ptp_data = ptp; |
1570 | if (!efx->ptp_data) |
1571 | return -ENOMEM; |
1572 | |
1573 | ptp->efx = efx; |
1574 | ptp->channel = channel; |
1575 | |
1576 | rc = efx_nic_alloc_buffer(efx, buffer: &ptp->start, len: sizeof(int), GFP_KERNEL); |
1577 | if (rc != 0) |
1578 | goto fail1; |
1579 | |
1580 | skb_queue_head_init(list: &ptp->rxq); |
1581 | skb_queue_head_init(list: &ptp->txq); |
1582 | ptp->workwq = create_singlethread_workqueue("sfc_ptp" ); |
1583 | if (!ptp->workwq) { |
1584 | rc = -ENOMEM; |
1585 | goto fail2; |
1586 | } |
1587 | |
1588 | if (efx_ptp_use_mac_tx_timestamps(efx)) { |
1589 | ptp->xmit_skb = efx_ptp_xmit_skb_queue; |
1590 | /* Request sync events on this channel. */ |
1591 | channel->sync_events_state = SYNC_EVENTS_QUIESCENT; |
1592 | } else { |
1593 | ptp->xmit_skb = efx_ptp_xmit_skb_mc; |
1594 | } |
1595 | |
1596 | INIT_WORK(&ptp->work, efx_ptp_worker); |
1597 | INIT_DELAYED_WORK(&ptp->cleanup_work, efx_ptp_cleanup_worker); |
1598 | ptp->config.flags = 0; |
1599 | ptp->config.tx_type = HWTSTAMP_TX_OFF; |
1600 | ptp->config.rx_filter = HWTSTAMP_FILTER_NONE; |
1601 | INIT_LIST_HEAD(list: &ptp->rxfilters_mcast); |
1602 | INIT_LIST_HEAD(list: &ptp->rxfilters_ucast); |
1603 | |
1604 | /* Get the NIC PTP attributes and set up time conversions */ |
1605 | rc = efx_ptp_get_attributes(efx); |
1606 | if (rc < 0) |
1607 | goto fail3; |
1608 | |
1609 | /* Get the timestamp corrections */ |
1610 | rc = efx_ptp_get_timestamp_corrections(efx); |
1611 | if (rc < 0) |
1612 | goto fail3; |
1613 | |
1614 | if (efx->mcdi->fn_flags & |
1615 | (1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_PRIMARY)) { |
1616 | ptp->phc_clock_info = efx_phc_clock_info; |
1617 | ptp->phc_clock = ptp_clock_register(info: &ptp->phc_clock_info, |
1618 | parent: &efx->pci_dev->dev); |
1619 | if (IS_ERR(ptr: ptp->phc_clock)) { |
1620 | rc = PTR_ERR(ptr: ptp->phc_clock); |
1621 | goto fail3; |
1622 | } else if (ptp->phc_clock) { |
1623 | INIT_WORK(&ptp->pps_work, efx_ptp_pps_worker); |
1624 | ptp->pps_workwq = create_singlethread_workqueue("sfc_pps" ); |
1625 | if (!ptp->pps_workwq) { |
1626 | rc = -ENOMEM; |
1627 | goto fail4; |
1628 | } |
1629 | } |
1630 | } |
1631 | ptp->nic_ts_enabled = false; |
1632 | |
1633 | return 0; |
1634 | fail4: |
1635 | ptp_clock_unregister(ptp: efx->ptp_data->phc_clock); |
1636 | |
1637 | fail3: |
1638 | destroy_workqueue(wq: efx->ptp_data->workwq); |
1639 | |
1640 | fail2: |
1641 | efx_nic_free_buffer(efx, buffer: &ptp->start); |
1642 | |
1643 | fail1: |
1644 | kfree(objp: efx->ptp_data); |
1645 | efx->ptp_data = NULL; |
1646 | |
1647 | return rc; |
1648 | } |
1649 | |
1650 | /* Initialise PTP channel. |
1651 | * |
1652 | * Setting core_index to zero causes the queue to be initialised and doesn't |
1653 | * overlap with 'rxq0' because ptp.c doesn't use skb_record_rx_queue. |
1654 | */ |
1655 | static int efx_ptp_probe_channel(struct efx_channel *channel) |
1656 | { |
1657 | struct efx_nic *efx = channel->efx; |
1658 | int rc; |
1659 | |
1660 | channel->irq_moderation_us = 0; |
1661 | channel->rx_queue.core_index = 0; |
1662 | |
1663 | rc = efx_ptp_probe(efx, channel); |
1664 | /* Failure to probe PTP is not fatal; this channel will just not be |
1665 | * used for anything. |
1666 | * In the case of EPERM, efx_ptp_probe will print its own message (in |
1667 | * efx_ptp_get_attributes()), so we don't need to. |
1668 | */ |
1669 | if (rc && rc != -EPERM) |
1670 | netif_warn(efx, drv, efx->net_dev, |
1671 | "Failed to probe PTP, rc=%d\n" , rc); |
1672 | return 0; |
1673 | } |
1674 | |
1675 | void efx_ptp_remove(struct efx_nic *efx) |
1676 | { |
1677 | if (!efx->ptp_data) |
1678 | return; |
1679 | |
1680 | (void)efx_ptp_disable(efx); |
1681 | |
1682 | cancel_work_sync(work: &efx->ptp_data->work); |
1683 | cancel_delayed_work_sync(dwork: &efx->ptp_data->cleanup_work); |
1684 | if (efx->ptp_data->pps_workwq) |
1685 | cancel_work_sync(work: &efx->ptp_data->pps_work); |
1686 | |
1687 | skb_queue_purge(list: &efx->ptp_data->rxq); |
1688 | skb_queue_purge(list: &efx->ptp_data->txq); |
1689 | |
1690 | if (efx->ptp_data->phc_clock) { |
1691 | destroy_workqueue(wq: efx->ptp_data->pps_workwq); |
1692 | ptp_clock_unregister(ptp: efx->ptp_data->phc_clock); |
1693 | } |
1694 | |
1695 | destroy_workqueue(wq: efx->ptp_data->workwq); |
1696 | |
1697 | efx_nic_free_buffer(efx, buffer: &efx->ptp_data->start); |
1698 | kfree(objp: efx->ptp_data); |
1699 | efx->ptp_data = NULL; |
1700 | } |
1701 | |
1702 | static void efx_ptp_remove_channel(struct efx_channel *channel) |
1703 | { |
1704 | efx_ptp_remove(efx: channel->efx); |
1705 | } |
1706 | |
1707 | static void efx_ptp_get_channel_name(struct efx_channel *channel, |
1708 | char *buf, size_t len) |
1709 | { |
1710 | snprintf(buf, size: len, fmt: "%s-ptp" , channel->efx->name); |
1711 | } |
1712 | |
1713 | /* Determine whether this packet should be processed by the PTP module |
1714 | * or transmitted conventionally. |
1715 | */ |
1716 | bool efx_ptp_is_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) |
1717 | { |
1718 | return efx->ptp_data && |
1719 | efx->ptp_data->enabled && |
1720 | skb->len >= PTP_MIN_LENGTH && |
1721 | skb->len <= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM && |
1722 | likely(skb->protocol == htons(ETH_P_IP)) && |
1723 | skb_transport_header_was_set(skb) && |
1724 | skb_network_header_len(skb) >= sizeof(struct iphdr) && |
1725 | ip_hdr(skb)->protocol == IPPROTO_UDP && |
1726 | skb_headlen(skb) >= |
1727 | skb_transport_offset(skb) + sizeof(struct udphdr) && |
1728 | udp_hdr(skb)->dest == htons(PTP_EVENT_PORT); |
1729 | } |
1730 | |
1731 | /* Receive a PTP packet. Packets are queued until the arrival of |
1732 | * the receive timestamp from the MC - this will probably occur after the |
1733 | * packet arrival because of the processing in the MC. |
1734 | */ |
1735 | static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb) |
1736 | { |
1737 | struct efx_nic *efx = channel->efx; |
1738 | struct efx_ptp_data *ptp = efx->ptp_data; |
1739 | struct efx_ptp_match *match = (struct efx_ptp_match *)skb->cb; |
1740 | unsigned int version; |
1741 | u8 *data; |
1742 | |
1743 | match->expiry = jiffies + msecs_to_jiffies(PKT_EVENT_LIFETIME_MS); |
1744 | |
1745 | /* Correct version? */ |
1746 | if (ptp->mode == MC_CMD_PTP_MODE_V1) { |
1747 | if (!pskb_may_pull(skb, PTP_V1_MIN_LENGTH)) { |
1748 | return false; |
1749 | } |
1750 | data = skb->data; |
1751 | version = ntohs(*(__be16 *)&data[PTP_V1_VERSION_OFFSET]); |
1752 | if (version != PTP_VERSION_V1) { |
1753 | return false; |
1754 | } |
1755 | } else { |
1756 | if (!pskb_may_pull(skb, PTP_V2_MIN_LENGTH)) { |
1757 | return false; |
1758 | } |
1759 | data = skb->data; |
1760 | version = data[PTP_V2_VERSION_OFFSET]; |
1761 | if ((version & PTP_VERSION_V2_MASK) != PTP_VERSION_V2) { |
1762 | return false; |
1763 | } |
1764 | } |
1765 | |
1766 | /* Does this packet require timestamping? */ |
1767 | if (ntohs(*(__be16 *)&data[PTP_DPORT_OFFSET]) == PTP_EVENT_PORT) { |
1768 | match->state = PTP_PACKET_STATE_UNMATCHED; |
1769 | |
1770 | /* We expect the sequence number to be in the same position in |
1771 | * the packet for PTP V1 and V2 |
1772 | */ |
1773 | BUILD_BUG_ON(PTP_V1_SEQUENCE_OFFSET != PTP_V2_SEQUENCE_OFFSET); |
1774 | BUILD_BUG_ON(PTP_V1_SEQUENCE_LENGTH != PTP_V2_SEQUENCE_LENGTH); |
1775 | } else { |
1776 | match->state = PTP_PACKET_STATE_MATCH_UNWANTED; |
1777 | } |
1778 | |
1779 | skb_queue_tail(list: &ptp->rxq, newsk: skb); |
1780 | queue_work(wq: ptp->workwq, work: &ptp->work); |
1781 | |
1782 | return true; |
1783 | } |
1784 | |
1785 | /* Transmit a PTP packet. This has to be transmitted by the MC |
1786 | * itself, through an MCDI call. MCDI calls aren't permitted |
1787 | * in the transmit path so defer the actual transmission to a suitable worker. |
1788 | */ |
1789 | int efx_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) |
1790 | { |
1791 | struct efx_ptp_data *ptp = efx->ptp_data; |
1792 | |
1793 | skb_queue_tail(list: &ptp->txq, newsk: skb); |
1794 | |
1795 | if ((udp_hdr(skb)->dest == htons(PTP_EVENT_PORT)) && |
1796 | (skb->len <= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM)) |
1797 | efx_xmit_hwtstamp_pending(skb); |
1798 | queue_work(wq: ptp->workwq, work: &ptp->work); |
1799 | |
1800 | return NETDEV_TX_OK; |
1801 | } |
1802 | |
1803 | int efx_ptp_get_mode(struct efx_nic *efx) |
1804 | { |
1805 | return efx->ptp_data->mode; |
1806 | } |
1807 | |
1808 | int efx_ptp_change_mode(struct efx_nic *efx, bool enable_wanted, |
1809 | unsigned int new_mode) |
1810 | { |
1811 | if ((enable_wanted != efx->ptp_data->enabled) || |
1812 | (enable_wanted && (efx->ptp_data->mode != new_mode))) { |
1813 | int rc = 0; |
1814 | |
1815 | if (enable_wanted) { |
1816 | /* Change of mode requires disable */ |
1817 | if (efx->ptp_data->enabled && |
1818 | (efx->ptp_data->mode != new_mode)) { |
1819 | efx->ptp_data->enabled = false; |
1820 | rc = efx_ptp_stop(efx); |
1821 | if (rc != 0) |
1822 | return rc; |
1823 | } |
1824 | |
1825 | /* Set new operating mode and establish |
1826 | * baseline synchronisation, which must |
1827 | * succeed. |
1828 | */ |
1829 | efx->ptp_data->mode = new_mode; |
1830 | if (netif_running(dev: efx->net_dev)) |
1831 | rc = efx_ptp_start(efx); |
1832 | if (rc == 0) { |
1833 | rc = efx_ptp_synchronize(efx, |
1834 | PTP_SYNC_ATTEMPTS * 2); |
1835 | if (rc != 0) |
1836 | efx_ptp_stop(efx); |
1837 | } |
1838 | } else { |
1839 | rc = efx_ptp_stop(efx); |
1840 | } |
1841 | |
1842 | if (rc != 0) |
1843 | return rc; |
1844 | |
1845 | efx->ptp_data->enabled = enable_wanted; |
1846 | } |
1847 | |
1848 | return 0; |
1849 | } |
1850 | |
1851 | static int efx_ptp_ts_init(struct efx_nic *efx, struct hwtstamp_config *init) |
1852 | { |
1853 | int rc; |
1854 | |
1855 | if ((init->tx_type != HWTSTAMP_TX_OFF) && |
1856 | (init->tx_type != HWTSTAMP_TX_ON)) |
1857 | return -ERANGE; |
1858 | |
1859 | rc = efx->type->ptp_set_ts_config(efx, init); |
1860 | if (rc) |
1861 | return rc; |
1862 | |
1863 | efx->ptp_data->config = *init; |
1864 | return 0; |
1865 | } |
1866 | |
1867 | void efx_ptp_get_ts_info(struct efx_nic *efx, struct ethtool_ts_info *ts_info) |
1868 | { |
1869 | struct efx_ptp_data *ptp = efx->ptp_data; |
1870 | struct efx_nic *primary = efx->primary; |
1871 | |
1872 | ASSERT_RTNL(); |
1873 | |
1874 | if (!ptp) |
1875 | return; |
1876 | |
1877 | ts_info->so_timestamping |= (SOF_TIMESTAMPING_TX_HARDWARE | |
1878 | SOF_TIMESTAMPING_RX_HARDWARE | |
1879 | SOF_TIMESTAMPING_RAW_HARDWARE); |
1880 | /* Check licensed features. If we don't have the license for TX |
1881 | * timestamps, the NIC will not support them. |
1882 | */ |
1883 | if (efx_ptp_use_mac_tx_timestamps(efx)) { |
1884 | struct efx_ef10_nic_data *nic_data = efx->nic_data; |
1885 | |
1886 | if (!(nic_data->licensed_features & |
1887 | (1 << LICENSED_V3_FEATURES_TX_TIMESTAMPS_LBN))) |
1888 | ts_info->so_timestamping &= |
1889 | ~SOF_TIMESTAMPING_TX_HARDWARE; |
1890 | } |
1891 | if (primary && primary->ptp_data && primary->ptp_data->phc_clock) |
1892 | ts_info->phc_index = |
1893 | ptp_clock_index(ptp: primary->ptp_data->phc_clock); |
1894 | ts_info->tx_types = 1 << HWTSTAMP_TX_OFF | 1 << HWTSTAMP_TX_ON; |
1895 | ts_info->rx_filters = ptp->efx->type->hwtstamp_filters; |
1896 | } |
1897 | |
1898 | int efx_ptp_set_ts_config(struct efx_nic *efx, struct ifreq *ifr) |
1899 | { |
1900 | struct hwtstamp_config config; |
1901 | int rc; |
1902 | |
1903 | /* Not a PTP enabled port */ |
1904 | if (!efx->ptp_data) |
1905 | return -EOPNOTSUPP; |
1906 | |
1907 | if (copy_from_user(to: &config, from: ifr->ifr_data, n: sizeof(config))) |
1908 | return -EFAULT; |
1909 | |
1910 | rc = efx_ptp_ts_init(efx, init: &config); |
1911 | if (rc != 0) |
1912 | return rc; |
1913 | |
1914 | return copy_to_user(to: ifr->ifr_data, from: &config, n: sizeof(config)) |
1915 | ? -EFAULT : 0; |
1916 | } |
1917 | |
1918 | int efx_ptp_get_ts_config(struct efx_nic *efx, struct ifreq *ifr) |
1919 | { |
1920 | if (!efx->ptp_data) |
1921 | return -EOPNOTSUPP; |
1922 | |
1923 | return copy_to_user(to: ifr->ifr_data, from: &efx->ptp_data->config, |
1924 | n: sizeof(efx->ptp_data->config)) ? -EFAULT : 0; |
1925 | } |
1926 | |
1927 | static void ptp_event_failure(struct efx_nic *efx, int expected_frag_len) |
1928 | { |
1929 | struct efx_ptp_data *ptp = efx->ptp_data; |
1930 | |
1931 | netif_err(efx, hw, efx->net_dev, |
1932 | "PTP unexpected event length: got %d expected %d\n" , |
1933 | ptp->evt_frag_idx, expected_frag_len); |
1934 | ptp->reset_required = true; |
1935 | queue_work(wq: ptp->workwq, work: &ptp->work); |
1936 | } |
1937 | |
1938 | static void ptp_event_fault(struct efx_nic *efx, struct efx_ptp_data *ptp) |
1939 | { |
1940 | int code = EFX_QWORD_FIELD(ptp->evt_frags[0], MCDI_EVENT_DATA); |
1941 | if (ptp->evt_frag_idx != 1) { |
1942 | ptp_event_failure(efx, expected_frag_len: 1); |
1943 | return; |
1944 | } |
1945 | |
1946 | netif_err(efx, hw, efx->net_dev, "PTP error %d\n" , code); |
1947 | } |
1948 | |
1949 | static void ptp_event_pps(struct efx_nic *efx, struct efx_ptp_data *ptp) |
1950 | { |
1951 | if (ptp->nic_ts_enabled) |
1952 | queue_work(wq: ptp->pps_workwq, work: &ptp->pps_work); |
1953 | } |
1954 | |
1955 | void efx_ptp_event(struct efx_nic *efx, efx_qword_t *ev) |
1956 | { |
1957 | struct efx_ptp_data *ptp = efx->ptp_data; |
1958 | int code = EFX_QWORD_FIELD(*ev, MCDI_EVENT_CODE); |
1959 | |
1960 | if (!ptp) { |
1961 | if (!efx->ptp_warned) { |
1962 | netif_warn(efx, drv, efx->net_dev, |
1963 | "Received PTP event but PTP not set up\n" ); |
1964 | efx->ptp_warned = true; |
1965 | } |
1966 | return; |
1967 | } |
1968 | |
1969 | if (!ptp->enabled) |
1970 | return; |
1971 | |
1972 | if (ptp->evt_frag_idx == 0) { |
1973 | ptp->evt_code = code; |
1974 | } else if (ptp->evt_code != code) { |
1975 | netif_err(efx, hw, efx->net_dev, |
1976 | "PTP out of sequence event %d\n" , code); |
1977 | ptp->evt_frag_idx = 0; |
1978 | } |
1979 | |
1980 | ptp->evt_frags[ptp->evt_frag_idx++] = *ev; |
1981 | if (!MCDI_EVENT_FIELD(*ev, CONT)) { |
1982 | /* Process resulting event */ |
1983 | switch (code) { |
1984 | case MCDI_EVENT_CODE_PTP_FAULT: |
1985 | ptp_event_fault(efx, ptp); |
1986 | break; |
1987 | case MCDI_EVENT_CODE_PTP_PPS: |
1988 | ptp_event_pps(efx, ptp); |
1989 | break; |
1990 | default: |
1991 | netif_err(efx, hw, efx->net_dev, |
1992 | "PTP unknown event %d\n" , code); |
1993 | break; |
1994 | } |
1995 | ptp->evt_frag_idx = 0; |
1996 | } else if (MAX_EVENT_FRAGS == ptp->evt_frag_idx) { |
1997 | netif_err(efx, hw, efx->net_dev, |
1998 | "PTP too many event fragments\n" ); |
1999 | ptp->evt_frag_idx = 0; |
2000 | } |
2001 | } |
2002 | |
2003 | void efx_time_sync_event(struct efx_channel *channel, efx_qword_t *ev) |
2004 | { |
2005 | struct efx_nic *efx = channel->efx; |
2006 | struct efx_ptp_data *ptp = efx->ptp_data; |
2007 | |
2008 | /* When extracting the sync timestamp minor value, we should discard |
2009 | * the least significant two bits. These are not required in order |
2010 | * to reconstruct full-range timestamps and they are optionally used |
2011 | * to report status depending on the options supplied when subscribing |
2012 | * for sync events. |
2013 | */ |
2014 | channel->sync_timestamp_major = MCDI_EVENT_FIELD(*ev, PTP_TIME_MAJOR); |
2015 | channel->sync_timestamp_minor = |
2016 | (MCDI_EVENT_FIELD(*ev, PTP_TIME_MINOR_MS_8BITS) & 0xFC) |
2017 | << ptp->nic_time.sync_event_minor_shift; |
2018 | |
2019 | /* if sync events have been disabled then we want to silently ignore |
2020 | * this event, so throw away result. |
2021 | */ |
2022 | (void) cmpxchg(&channel->sync_events_state, SYNC_EVENTS_REQUESTED, |
2023 | SYNC_EVENTS_VALID); |
2024 | } |
2025 | |
2026 | static inline u32 efx_rx_buf_timestamp_minor(struct efx_nic *efx, const u8 *eh) |
2027 | { |
2028 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
2029 | return __le32_to_cpup(p: (const __le32 *)(eh + efx->rx_packet_ts_offset)); |
2030 | #else |
2031 | const u8 *data = eh + efx->rx_packet_ts_offset; |
2032 | return (u32)data[0] | |
2033 | (u32)data[1] << 8 | |
2034 | (u32)data[2] << 16 | |
2035 | (u32)data[3] << 24; |
2036 | #endif |
2037 | } |
2038 | |
2039 | void __efx_rx_skb_attach_timestamp(struct efx_channel *channel, |
2040 | struct sk_buff *skb) |
2041 | { |
2042 | struct efx_nic *efx = channel->efx; |
2043 | struct efx_ptp_data *ptp = efx->ptp_data; |
2044 | u32 pkt_timestamp_major, pkt_timestamp_minor; |
2045 | u32 diff, carry; |
2046 | struct skb_shared_hwtstamps *timestamps; |
2047 | |
2048 | if (channel->sync_events_state != SYNC_EVENTS_VALID) |
2049 | return; |
2050 | |
2051 | pkt_timestamp_minor = efx_rx_buf_timestamp_minor(efx, eh: skb_mac_header(skb)); |
2052 | |
2053 | /* get the difference between the packet and sync timestamps, |
2054 | * modulo one second |
2055 | */ |
2056 | diff = pkt_timestamp_minor - channel->sync_timestamp_minor; |
2057 | if (pkt_timestamp_minor < channel->sync_timestamp_minor) |
2058 | diff += ptp->nic_time.minor_max; |
2059 | |
2060 | /* do we roll over a second boundary and need to carry the one? */ |
2061 | carry = (channel->sync_timestamp_minor >= ptp->nic_time.minor_max - diff) ? |
2062 | 1 : 0; |
2063 | |
2064 | if (diff <= ptp->nic_time.sync_event_diff_max) { |
2065 | /* packet is ahead of the sync event by a quarter of a second or |
2066 | * less (allowing for fuzz) |
2067 | */ |
2068 | pkt_timestamp_major = channel->sync_timestamp_major + carry; |
2069 | } else if (diff >= ptp->nic_time.sync_event_diff_min) { |
2070 | /* packet is behind the sync event but within the fuzz factor. |
2071 | * This means the RX packet and sync event crossed as they were |
2072 | * placed on the event queue, which can sometimes happen. |
2073 | */ |
2074 | pkt_timestamp_major = channel->sync_timestamp_major - 1 + carry; |
2075 | } else { |
2076 | /* it's outside tolerance in both directions. this might be |
2077 | * indicative of us missing sync events for some reason, so |
2078 | * we'll call it an error rather than risk giving a bogus |
2079 | * timestamp. |
2080 | */ |
2081 | netif_vdbg(efx, drv, efx->net_dev, |
2082 | "packet timestamp %x too far from sync event %x:%x\n" , |
2083 | pkt_timestamp_minor, channel->sync_timestamp_major, |
2084 | channel->sync_timestamp_minor); |
2085 | return; |
2086 | } |
2087 | |
2088 | /* attach the timestamps to the skb */ |
2089 | timestamps = skb_hwtstamps(skb); |
2090 | timestamps->hwtstamp = |
2091 | ptp->nic_to_kernel_time(pkt_timestamp_major, |
2092 | pkt_timestamp_minor, |
2093 | ptp->ts_corrections.general_rx); |
2094 | } |
2095 | |
2096 | static int efx_phc_adjfine(struct ptp_clock_info *ptp, long scaled_ppm) |
2097 | { |
2098 | struct efx_ptp_data *ptp_data = container_of(ptp, |
2099 | struct efx_ptp_data, |
2100 | phc_clock_info); |
2101 | s32 delta = scaled_ppm_to_ppb(ppm: scaled_ppm); |
2102 | struct efx_nic *efx = ptp_data->efx; |
2103 | MCDI_DECLARE_BUF(inadj, MC_CMD_PTP_IN_ADJUST_LEN); |
2104 | s64 adjustment_ns; |
2105 | int rc; |
2106 | |
2107 | if (delta > MAX_PPB) |
2108 | delta = MAX_PPB; |
2109 | else if (delta < -MAX_PPB) |
2110 | delta = -MAX_PPB; |
2111 | |
2112 | /* Convert ppb to fixed point ns taking care to round correctly. */ |
2113 | adjustment_ns = ((s64)delta * PPB_SCALE_WORD + |
2114 | (1 << (ptp_data->adjfreq_ppb_shift - 1))) >> |
2115 | ptp_data->adjfreq_ppb_shift; |
2116 | |
2117 | MCDI_SET_DWORD(inadj, PTP_IN_OP, MC_CMD_PTP_OP_ADJUST); |
2118 | MCDI_SET_DWORD(inadj, PTP_IN_PERIPH_ID, 0); |
2119 | MCDI_SET_QWORD(inadj, PTP_IN_ADJUST_FREQ, adjustment_ns); |
2120 | MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_SECONDS, 0); |
2121 | MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_NANOSECONDS, 0); |
2122 | rc = efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf: inadj, inlen: sizeof(inadj), |
2123 | NULL, outlen: 0, NULL); |
2124 | if (rc != 0) |
2125 | return rc; |
2126 | |
2127 | ptp_data->current_adjfreq = adjustment_ns; |
2128 | return 0; |
2129 | } |
2130 | |
2131 | static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta) |
2132 | { |
2133 | u32 nic_major, nic_minor; |
2134 | struct efx_ptp_data *ptp_data = container_of(ptp, |
2135 | struct efx_ptp_data, |
2136 | phc_clock_info); |
2137 | struct efx_nic *efx = ptp_data->efx; |
2138 | MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_ADJUST_LEN); |
2139 | |
2140 | efx->ptp_data->ns_to_nic_time(delta, &nic_major, &nic_minor); |
2141 | |
2142 | MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_ADJUST); |
2143 | MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0); |
2144 | MCDI_SET_QWORD(inbuf, PTP_IN_ADJUST_FREQ, ptp_data->current_adjfreq); |
2145 | MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_MAJOR, nic_major); |
2146 | MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_MINOR, nic_minor); |
2147 | return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, inlen: sizeof(inbuf), |
2148 | NULL, outlen: 0, NULL); |
2149 | } |
2150 | |
2151 | static int efx_phc_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts) |
2152 | { |
2153 | struct efx_ptp_data *ptp_data = container_of(ptp, |
2154 | struct efx_ptp_data, |
2155 | phc_clock_info); |
2156 | struct efx_nic *efx = ptp_data->efx; |
2157 | MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_READ_NIC_TIME_LEN); |
2158 | MCDI_DECLARE_BUF(outbuf, MC_CMD_PTP_OUT_READ_NIC_TIME_LEN); |
2159 | int rc; |
2160 | ktime_t kt; |
2161 | |
2162 | MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_READ_NIC_TIME); |
2163 | MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0); |
2164 | |
2165 | rc = efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, inlen: sizeof(inbuf), |
2166 | outbuf, outlen: sizeof(outbuf), NULL); |
2167 | if (rc != 0) |
2168 | return rc; |
2169 | |
2170 | kt = ptp_data->nic_to_kernel_time( |
2171 | MCDI_DWORD(outbuf, PTP_OUT_READ_NIC_TIME_MAJOR), |
2172 | MCDI_DWORD(outbuf, PTP_OUT_READ_NIC_TIME_MINOR), 0); |
2173 | *ts = ktime_to_timespec64(kt); |
2174 | return 0; |
2175 | } |
2176 | |
2177 | static int efx_phc_settime(struct ptp_clock_info *ptp, |
2178 | const struct timespec64 *e_ts) |
2179 | { |
2180 | /* Get the current NIC time, efx_phc_gettime. |
2181 | * Subtract from the desired time to get the offset |
2182 | * call efx_phc_adjtime with the offset |
2183 | */ |
2184 | int rc; |
2185 | struct timespec64 time_now; |
2186 | struct timespec64 delta; |
2187 | |
2188 | rc = efx_phc_gettime(ptp, ts: &time_now); |
2189 | if (rc != 0) |
2190 | return rc; |
2191 | |
2192 | delta = timespec64_sub(lhs: *e_ts, rhs: time_now); |
2193 | |
2194 | rc = efx_phc_adjtime(ptp, delta: timespec64_to_ns(ts: &delta)); |
2195 | if (rc != 0) |
2196 | return rc; |
2197 | |
2198 | return 0; |
2199 | } |
2200 | |
2201 | static int efx_phc_enable(struct ptp_clock_info *ptp, |
2202 | struct ptp_clock_request *request, |
2203 | int enable) |
2204 | { |
2205 | struct efx_ptp_data *ptp_data = container_of(ptp, |
2206 | struct efx_ptp_data, |
2207 | phc_clock_info); |
2208 | if (request->type != PTP_CLK_REQ_PPS) |
2209 | return -EOPNOTSUPP; |
2210 | |
2211 | ptp_data->nic_ts_enabled = !!enable; |
2212 | return 0; |
2213 | } |
2214 | |
2215 | static const struct efx_channel_type efx_ptp_channel_type = { |
2216 | .handle_no_channel = efx_ptp_handle_no_channel, |
2217 | .pre_probe = efx_ptp_probe_channel, |
2218 | .post_remove = efx_ptp_remove_channel, |
2219 | .get_name = efx_ptp_get_channel_name, |
2220 | .copy = efx_copy_channel, |
2221 | .receive_skb = efx_ptp_rx, |
2222 | .want_txqs = efx_ptp_want_txqs, |
2223 | .keep_eventq = false, |
2224 | }; |
2225 | |
2226 | void efx_ptp_defer_probe_with_channel(struct efx_nic *efx) |
2227 | { |
2228 | /* Check whether PTP is implemented on this NIC. The DISABLE |
2229 | * operation will succeed if and only if it is implemented. |
2230 | */ |
2231 | if (efx_ptp_disable(efx) == 0) |
2232 | efx->extra_channel_type[EFX_EXTRA_CHANNEL_PTP] = |
2233 | &efx_ptp_channel_type; |
2234 | } |
2235 | |
2236 | void efx_ptp_start_datapath(struct efx_nic *efx) |
2237 | { |
2238 | if (efx_ptp_restart(efx)) |
2239 | netif_err(efx, drv, efx->net_dev, "Failed to restart PTP.\n" ); |
2240 | /* re-enable timestamping if it was previously enabled */ |
2241 | if (efx->type->ptp_set_ts_sync_events) |
2242 | efx->type->ptp_set_ts_sync_events(efx, true, true); |
2243 | } |
2244 | |
2245 | void efx_ptp_stop_datapath(struct efx_nic *efx) |
2246 | { |
2247 | /* temporarily disable timestamping */ |
2248 | if (efx->type->ptp_set_ts_sync_events) |
2249 | efx->type->ptp_set_ts_sync_events(efx, false, true); |
2250 | efx_ptp_stop(efx); |
2251 | } |
2252 | |