Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1 | /**************************************************************************** |
Ben Hutchings | f7a6d2c | 2013-08-29 23:32:48 +0100 | [diff] [blame] | 2 | * Driver for Solarflare network controllers and boards |
| 3 | * Copyright 2011-2013 Solarflare Communications Inc. |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 4 | * |
| 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. |
| 8 | */ |
| 9 | |
| 10 | /* Theory of operation: |
| 11 | * |
| 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. |
| 17 | * |
| 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. |
| 26 | * |
| 27 | * Work queue processing: |
| 28 | * If work waiting, synchronise host/hardware time |
| 29 | * |
| 30 | * Transmit: send packet through MC, which returns the transmission time |
| 31 | * that is converted to an appropriate timestamp. |
| 32 | * |
| 33 | * Receive: the packet's reception time is converted to an appropriate |
| 34 | * timestamp. |
| 35 | */ |
| 36 | #include <linux/ip.h> |
| 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" |
| 45 | #include "efx.h" |
| 46 | #include "mcdi.h" |
| 47 | #include "mcdi_pcol.h" |
| 48 | #include "io.h" |
Ben Hutchings | 8b8a95a | 2012-09-18 01:57:07 +0100 | [diff] [blame] | 49 | #include "farch_regs.h" |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 50 | #include "nic.h" |
| 51 | |
| 52 | /* Maximum number of events expected to make up a PTP event */ |
| 53 | #define MAX_EVENT_FRAGS 3 |
| 54 | |
| 55 | /* Maximum delay, ms, to begin synchronisation */ |
| 56 | #define MAX_SYNCHRONISE_WAIT_MS 2 |
| 57 | |
| 58 | /* How long, at most, to spend synchronising */ |
| 59 | #define SYNCHRONISE_PERIOD_NS 250000 |
| 60 | |
| 61 | /* How often to update the shared memory time */ |
| 62 | #define SYNCHRONISATION_GRANULARITY_NS 200 |
| 63 | |
| 64 | /* Minimum permitted length of a (corrected) synchronisation time */ |
| 65 | #define MIN_SYNCHRONISATION_NS 120 |
| 66 | |
| 67 | /* Maximum permitted length of a (corrected) synchronisation time */ |
| 68 | #define MAX_SYNCHRONISATION_NS 1000 |
| 69 | |
| 70 | /* How many (MC) receive events that can be queued */ |
| 71 | #define MAX_RECEIVE_EVENTS 8 |
| 72 | |
| 73 | /* Length of (modified) moving average. */ |
| 74 | #define AVERAGE_LENGTH 16 |
| 75 | |
| 76 | /* How long an unmatched event or packet can be held */ |
| 77 | #define PKT_EVENT_LIFETIME_MS 10 |
| 78 | |
| 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. |
| 82 | */ |
| 83 | #define PTP_DPORT_OFFSET 22 |
| 84 | |
| 85 | #define PTP_V1_VERSION_LENGTH 2 |
| 86 | #define PTP_V1_VERSION_OFFSET 28 |
| 87 | |
| 88 | #define PTP_V1_UUID_LENGTH 6 |
| 89 | #define PTP_V1_UUID_OFFSET 50 |
| 90 | |
| 91 | #define PTP_V1_SEQUENCE_LENGTH 2 |
| 92 | #define PTP_V1_SEQUENCE_OFFSET 58 |
| 93 | |
| 94 | /* The minimum length of a PTP V1 packet for offsets, etc. to be valid: |
| 95 | * includes IP header. |
| 96 | */ |
| 97 | #define PTP_V1_MIN_LENGTH 64 |
| 98 | |
| 99 | #define PTP_V2_VERSION_LENGTH 1 |
| 100 | #define PTP_V2_VERSION_OFFSET 29 |
| 101 | |
Laurence Evans | c939a31 | 2012-11-15 10:56:07 +0000 | [diff] [blame] | 102 | #define PTP_V2_UUID_LENGTH 8 |
| 103 | #define PTP_V2_UUID_OFFSET 48 |
| 104 | |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 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. |
| 109 | */ |
| 110 | #define PTP_V2_MC_UUID_LENGTH 6 |
| 111 | #define PTP_V2_MC_UUID_OFFSET 50 |
| 112 | |
| 113 | #define PTP_V2_SEQUENCE_LENGTH 2 |
| 114 | #define PTP_V2_SEQUENCE_OFFSET 58 |
| 115 | |
| 116 | /* The minimum length of a PTP V2 packet for offsets, etc. to be valid: |
| 117 | * includes IP header. |
| 118 | */ |
| 119 | #define PTP_V2_MIN_LENGTH 63 |
| 120 | |
| 121 | #define PTP_MIN_LENGTH 63 |
| 122 | |
| 123 | #define PTP_ADDRESS 0xe0000181 /* 224.0.1.129 */ |
| 124 | #define PTP_EVENT_PORT 319 |
| 125 | #define PTP_GENERAL_PORT 320 |
| 126 | |
| 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. |
| 129 | */ |
| 130 | #define PTP_VERSION_V1 1 |
| 131 | |
| 132 | #define PTP_VERSION_V2 2 |
| 133 | #define PTP_VERSION_V2_MASK 0x0f |
| 134 | |
| 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 |
| 140 | }; |
| 141 | |
| 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. |
| 144 | */ |
| 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) |
| 148 | |
| 149 | /* Maximum parts-per-billion adjustment that is acceptable */ |
| 150 | #define MAX_PPB 1000000 |
| 151 | |
| 152 | /* Number of bits required to hold the above */ |
| 153 | #define MAX_PPB_BITS 20 |
| 154 | |
| 155 | /* Number of extra bits allowed when calculating fractional ns. |
| 156 | * EXTRA_BITS + MC_CMD_PTP_IN_ADJUST_BITS + MAX_PPB_BITS should |
| 157 | * be less than 63. |
| 158 | */ |
| 159 | #define PPB_EXTRA_BITS 2 |
| 160 | |
| 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) |
| 164 | |
| 165 | #define PTP_SYNC_ATTEMPTS 4 |
| 166 | |
| 167 | /** |
| 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 |
| 171 | * event arrival. |
| 172 | * @state: The state of the packet - whether it is ready for processing or |
| 173 | * whether that is of no interest. |
| 174 | */ |
| 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; |
| 179 | }; |
| 180 | |
| 181 | /** |
| 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 |
| 186 | */ |
| 187 | struct efx_ptp_event_rx { |
| 188 | struct list_head link; |
| 189 | u32 seq0; |
| 190 | u32 seq1; |
| 191 | ktime_t hwtimestamp; |
| 192 | unsigned long expiry; |
| 193 | }; |
| 194 | |
| 195 | /** |
| 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 |
| 205 | */ |
| 206 | struct efx_ptp_timeset { |
| 207 | u32 host_start; |
| 208 | u32 seconds; |
| 209 | u32 nanoseconds; |
| 210 | u32 host_end; |
| 211 | u32 waitns; |
| 212 | u32 window; /* Derived: end - start, allowing for wrap */ |
| 213 | }; |
| 214 | |
| 215 | /** |
| 216 | * struct efx_ptp_data - Precision Time Protocol (PTP) state |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 217 | * @efx: The NIC context |
| 218 | * @channel: The PTP channel (Siena only) |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 219 | * @rxq: Receive queue (awaiting timestamps) |
| 220 | * @txq: Transmit queue |
| 221 | * @evt_list: List of MC receive events awaiting packets |
| 222 | * @evt_free_list: List of free events |
| 223 | * @evt_lock: Lock for manipulating evt_list and evt_free_list |
Laurence Evans | f321160 | 2013-01-28 14:51:17 +0000 | [diff] [blame] | 224 | * @evt_overflow: Boolean indicating that event list has overflowed |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 225 | * @rx_evts: Instantiated events (on evt_list and evt_free_list) |
| 226 | * @workwq: Work queue for processing pending PTP operations |
| 227 | * @work: Work task |
| 228 | * @reset_required: A serious error has occurred and the PTP task needs to be |
| 229 | * reset (disable, enable). |
| 230 | * @rxfilter_event: Receive filter when operating |
| 231 | * @rxfilter_general: Receive filter when operating |
| 232 | * @config: Current timestamp configuration |
| 233 | * @enabled: PTP operation enabled |
| 234 | * @mode: Mode in which PTP operating (PTP version) |
| 235 | * @evt_frags: Partly assembled PTP events |
| 236 | * @evt_frag_idx: Current fragment number |
| 237 | * @evt_code: Last event code |
| 238 | * @start: Address at which MC indicates ready for synchronisation |
| 239 | * @host_time_pps: Host time at last PPS |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 240 | * @current_adjfreq: Current ppb adjustment. |
| 241 | * @phc_clock: Pointer to registered phc device |
| 242 | * @phc_clock_info: Registration structure for phc device |
| 243 | * @pps_work: pps work task for handling pps events |
| 244 | * @pps_workwq: pps work queue |
| 245 | * @nic_ts_enabled: Flag indicating if NIC generated TS events are handled |
| 246 | * @txbuf: Buffer for use when transmitting (PTP) packets to MC (avoids |
| 247 | * allocations in main data path). |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 248 | * @timeset: Last set of synchronisation statistics. |
| 249 | */ |
| 250 | struct efx_ptp_data { |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 251 | struct efx_nic *efx; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 252 | struct efx_channel *channel; |
| 253 | struct sk_buff_head rxq; |
| 254 | struct sk_buff_head txq; |
| 255 | struct list_head evt_list; |
| 256 | struct list_head evt_free_list; |
| 257 | spinlock_t evt_lock; |
Laurence Evans | f321160 | 2013-01-28 14:51:17 +0000 | [diff] [blame] | 258 | bool evt_overflow; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 259 | struct efx_ptp_event_rx rx_evts[MAX_RECEIVE_EVENTS]; |
| 260 | struct workqueue_struct *workwq; |
| 261 | struct work_struct work; |
| 262 | bool reset_required; |
| 263 | u32 rxfilter_event; |
| 264 | u32 rxfilter_general; |
| 265 | bool rxfilter_installed; |
| 266 | struct hwtstamp_config config; |
| 267 | bool enabled; |
| 268 | unsigned int mode; |
| 269 | efx_qword_t evt_frags[MAX_EVENT_FRAGS]; |
| 270 | int evt_frag_idx; |
| 271 | int evt_code; |
| 272 | struct efx_buffer start; |
| 273 | struct pps_event_time host_time_pps; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 274 | s64 current_adjfreq; |
| 275 | struct ptp_clock *phc_clock; |
| 276 | struct ptp_clock_info phc_clock_info; |
| 277 | struct work_struct pps_work; |
| 278 | struct workqueue_struct *pps_workwq; |
| 279 | bool nic_ts_enabled; |
Ben Hutchings | c5bb0e9 | 2012-09-14 17:31:33 +0100 | [diff] [blame] | 280 | MCDI_DECLARE_BUF(txbuf, MC_CMD_PTP_IN_TRANSMIT_LENMAX); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 281 | struct efx_ptp_timeset |
| 282 | timeset[MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_MAXNUM]; |
| 283 | }; |
| 284 | |
| 285 | static int efx_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta); |
| 286 | static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta); |
| 287 | static int efx_phc_gettime(struct ptp_clock_info *ptp, struct timespec *ts); |
| 288 | static int efx_phc_settime(struct ptp_clock_info *ptp, |
| 289 | const struct timespec *e_ts); |
| 290 | static int efx_phc_enable(struct ptp_clock_info *ptp, |
| 291 | struct ptp_clock_request *request, int on); |
| 292 | |
| 293 | /* Enable MCDI PTP support. */ |
| 294 | static int efx_ptp_enable(struct efx_nic *efx) |
| 295 | { |
Ben Hutchings | 59cfc47 | 2012-09-14 17:30:10 +0100 | [diff] [blame] | 296 | MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_ENABLE_LEN); |
Edward Cree | 1e0b812 | 2013-05-31 18:36:12 +0100 | [diff] [blame] | 297 | MCDI_DECLARE_BUF_OUT_OR_ERR(outbuf, 0); |
| 298 | int rc; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 299 | |
| 300 | MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_ENABLE); |
Laurence Evans | c1d828b | 2013-03-06 15:33:17 +0000 | [diff] [blame] | 301 | MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 302 | MCDI_SET_DWORD(inbuf, PTP_IN_ENABLE_QUEUE, |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 303 | efx->ptp_data->channel ? |
| 304 | efx->ptp_data->channel->channel : 0); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 305 | MCDI_SET_DWORD(inbuf, PTP_IN_ENABLE_MODE, efx->ptp_data->mode); |
| 306 | |
Edward Cree | 1e0b812 | 2013-05-31 18:36:12 +0100 | [diff] [blame] | 307 | rc = efx_mcdi_rpc_quiet(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), |
| 308 | outbuf, sizeof(outbuf), NULL); |
| 309 | rc = (rc == -EALREADY) ? 0 : rc; |
| 310 | if (rc) |
| 311 | efx_mcdi_display_error(efx, MC_CMD_PTP, |
| 312 | MC_CMD_PTP_IN_ENABLE_LEN, |
| 313 | outbuf, sizeof(outbuf), rc); |
| 314 | return rc; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 315 | } |
| 316 | |
| 317 | /* Disable MCDI PTP support. |
| 318 | * |
| 319 | * Note that this function should never rely on the presence of ptp_data - |
| 320 | * may be called before that exists. |
| 321 | */ |
| 322 | static int efx_ptp_disable(struct efx_nic *efx) |
| 323 | { |
Ben Hutchings | 59cfc47 | 2012-09-14 17:30:10 +0100 | [diff] [blame] | 324 | MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_DISABLE_LEN); |
Edward Cree | 1e0b812 | 2013-05-31 18:36:12 +0100 | [diff] [blame] | 325 | MCDI_DECLARE_BUF_OUT_OR_ERR(outbuf, 0); |
| 326 | int rc; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 327 | |
| 328 | MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_DISABLE); |
Laurence Evans | c1d828b | 2013-03-06 15:33:17 +0000 | [diff] [blame] | 329 | MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0); |
Edward Cree | 1e0b812 | 2013-05-31 18:36:12 +0100 | [diff] [blame] | 330 | rc = efx_mcdi_rpc_quiet(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), |
| 331 | outbuf, sizeof(outbuf), NULL); |
| 332 | rc = (rc == -EALREADY) ? 0 : rc; |
| 333 | if (rc) |
| 334 | efx_mcdi_display_error(efx, MC_CMD_PTP, |
| 335 | MC_CMD_PTP_IN_DISABLE_LEN, |
| 336 | outbuf, sizeof(outbuf), rc); |
| 337 | return rc; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | static void efx_ptp_deliver_rx_queue(struct sk_buff_head *q) |
| 341 | { |
| 342 | struct sk_buff *skb; |
| 343 | |
| 344 | while ((skb = skb_dequeue(q))) { |
| 345 | local_bh_disable(); |
| 346 | netif_receive_skb(skb); |
| 347 | local_bh_enable(); |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | static void efx_ptp_handle_no_channel(struct efx_nic *efx) |
| 352 | { |
| 353 | netif_err(efx, drv, efx->net_dev, |
| 354 | "ERROR: PTP requires MSI-X and 1 additional interrupt" |
| 355 | "vector. PTP disabled\n"); |
| 356 | } |
| 357 | |
| 358 | /* Repeatedly send the host time to the MC which will capture the hardware |
| 359 | * time. |
| 360 | */ |
| 361 | static void efx_ptp_send_times(struct efx_nic *efx, |
| 362 | struct pps_event_time *last_time) |
| 363 | { |
| 364 | struct pps_event_time now; |
| 365 | struct timespec limit; |
| 366 | struct efx_ptp_data *ptp = efx->ptp_data; |
| 367 | struct timespec start; |
| 368 | int *mc_running = ptp->start.addr; |
| 369 | |
| 370 | pps_get_ts(&now); |
| 371 | start = now.ts_real; |
| 372 | limit = now.ts_real; |
| 373 | timespec_add_ns(&limit, SYNCHRONISE_PERIOD_NS); |
| 374 | |
| 375 | /* Write host time for specified period or until MC is done */ |
| 376 | while ((timespec_compare(&now.ts_real, &limit) < 0) && |
| 377 | ACCESS_ONCE(*mc_running)) { |
| 378 | struct timespec update_time; |
| 379 | unsigned int host_time; |
| 380 | |
| 381 | /* Don't update continuously to avoid saturating the PCIe bus */ |
| 382 | update_time = now.ts_real; |
| 383 | timespec_add_ns(&update_time, SYNCHRONISATION_GRANULARITY_NS); |
| 384 | do { |
| 385 | pps_get_ts(&now); |
| 386 | } while ((timespec_compare(&now.ts_real, &update_time) < 0) && |
| 387 | ACCESS_ONCE(*mc_running)); |
| 388 | |
| 389 | /* Synchronise NIC with single word of time only */ |
| 390 | host_time = (now.ts_real.tv_sec << MC_NANOSECOND_BITS | |
| 391 | now.ts_real.tv_nsec); |
| 392 | /* Update host time in NIC memory */ |
Laurence Evans | 977a5d5 | 2013-03-07 11:46:58 +0000 | [diff] [blame] | 393 | efx->type->ptp_write_host_time(efx, host_time); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 394 | } |
| 395 | *last_time = now; |
| 396 | } |
| 397 | |
| 398 | /* Read a timeset from the MC's results and partial process. */ |
Ben Hutchings | c5bb0e9 | 2012-09-14 17:31:33 +0100 | [diff] [blame] | 399 | static void efx_ptp_read_timeset(MCDI_DECLARE_STRUCT_PTR(data), |
| 400 | struct efx_ptp_timeset *timeset) |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 401 | { |
| 402 | unsigned start_ns, end_ns; |
| 403 | |
| 404 | timeset->host_start = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_HOSTSTART); |
| 405 | timeset->seconds = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_SECONDS); |
| 406 | timeset->nanoseconds = MCDI_DWORD(data, |
| 407 | PTP_OUT_SYNCHRONIZE_NANOSECONDS); |
| 408 | timeset->host_end = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_HOSTEND), |
| 409 | timeset->waitns = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_WAITNS); |
| 410 | |
| 411 | /* Ignore seconds */ |
| 412 | start_ns = timeset->host_start & MC_NANOSECOND_MASK; |
| 413 | end_ns = timeset->host_end & MC_NANOSECOND_MASK; |
| 414 | /* Allow for rollover */ |
| 415 | if (end_ns < start_ns) |
| 416 | end_ns += NSEC_PER_SEC; |
| 417 | /* Determine duration of operation */ |
| 418 | timeset->window = end_ns - start_ns; |
| 419 | } |
| 420 | |
| 421 | /* Process times received from MC. |
| 422 | * |
| 423 | * Extract times from returned results, and establish the minimum value |
| 424 | * seen. The minimum value represents the "best" possible time and events |
| 425 | * too much greater than this are rejected - the machine is, perhaps, too |
| 426 | * busy. A number of readings are taken so that, hopefully, at least one good |
| 427 | * synchronisation will be seen in the results. |
| 428 | */ |
Ben Hutchings | c5bb0e9 | 2012-09-14 17:31:33 +0100 | [diff] [blame] | 429 | static int |
| 430 | efx_ptp_process_times(struct efx_nic *efx, MCDI_DECLARE_STRUCT_PTR(synch_buf), |
| 431 | size_t response_length, |
| 432 | const struct pps_event_time *last_time) |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 433 | { |
Ben Hutchings | c5bb0e9 | 2012-09-14 17:31:33 +0100 | [diff] [blame] | 434 | unsigned number_readings = |
| 435 | MCDI_VAR_ARRAY_LEN(response_length, |
| 436 | PTP_OUT_SYNCHRONIZE_TIMESET); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 437 | unsigned i; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 438 | unsigned ngood = 0; |
| 439 | unsigned last_good = 0; |
| 440 | struct efx_ptp_data *ptp = efx->ptp_data; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 441 | u32 last_sec; |
| 442 | u32 start_sec; |
| 443 | struct timespec delta; |
| 444 | |
| 445 | if (number_readings == 0) |
| 446 | return -EAGAIN; |
| 447 | |
Laurence Evans | dfd8d58 | 2013-11-21 10:38:24 +0000 | [diff] [blame^] | 448 | /* Read the set of results and find the last good host-MC |
| 449 | * synchronization result. The MC times when it finishes reading the |
| 450 | * host time so the corrected window time should be fairly constant |
| 451 | * for a given platform. |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 452 | */ |
| 453 | for (i = 0; i < number_readings; i++) { |
Laurence Evans | dfd8d58 | 2013-11-21 10:38:24 +0000 | [diff] [blame^] | 454 | s32 window, corrected; |
| 455 | |
Ben Hutchings | c5bb0e9 | 2012-09-14 17:31:33 +0100 | [diff] [blame] | 456 | efx_ptp_read_timeset( |
| 457 | MCDI_ARRAY_STRUCT_PTR(synch_buf, |
| 458 | PTP_OUT_SYNCHRONIZE_TIMESET, i), |
| 459 | &ptp->timeset[i]); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 460 | |
Laurence Evans | dfd8d58 | 2013-11-21 10:38:24 +0000 | [diff] [blame^] | 461 | window = ptp->timeset[i].window; |
| 462 | corrected = window - ptp->timeset[i].waitns; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 463 | |
Laurence Evans | dfd8d58 | 2013-11-21 10:38:24 +0000 | [diff] [blame^] | 464 | /* We expect the uncorrected synchronization window to be at |
| 465 | * least as large as the interval between host start and end |
| 466 | * times. If it is smaller than this then this is mostly likely |
| 467 | * to be a consequence of the host's time being adjusted. |
| 468 | * Check that the corrected sync window is in a reasonable |
| 469 | * range. If it is out of range it is likely to be because an |
| 470 | * interrupt or other delay occurred between reading the system |
| 471 | * time and writing it to MC memory. |
| 472 | */ |
| 473 | if (window >= SYNCHRONISATION_GRANULARITY_NS && |
| 474 | corrected < MAX_SYNCHRONISATION_NS && |
| 475 | corrected >= MIN_SYNCHRONISATION_NS) { |
| 476 | ngood++; |
| 477 | last_good = i; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 478 | } |
Laurence Evans | dfd8d58 | 2013-11-21 10:38:24 +0000 | [diff] [blame^] | 479 | } |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 480 | |
| 481 | if (ngood == 0) { |
| 482 | netif_warn(efx, drv, efx->net_dev, |
Laurence Evans | 94cd60d | 2013-11-21 10:38:24 +0000 | [diff] [blame] | 483 | "PTP no suitable synchronisations\n"); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 484 | return -EAGAIN; |
| 485 | } |
| 486 | |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 487 | /* Calculate delay from actual PPS to last_time */ |
| 488 | delta.tv_nsec = |
| 489 | ptp->timeset[last_good].nanoseconds + |
| 490 | last_time->ts_real.tv_nsec - |
| 491 | (ptp->timeset[last_good].host_start & MC_NANOSECOND_MASK); |
| 492 | |
| 493 | /* It is possible that the seconds rolled over between taking |
| 494 | * the start reading and the last value written by the host. The |
| 495 | * timescales are such that a gap of more than one second is never |
| 496 | * expected. |
| 497 | */ |
| 498 | start_sec = ptp->timeset[last_good].host_start >> MC_NANOSECOND_BITS; |
| 499 | last_sec = last_time->ts_real.tv_sec & MC_SECOND_MASK; |
| 500 | if (start_sec != last_sec) { |
| 501 | if (((start_sec + 1) & MC_SECOND_MASK) != last_sec) { |
| 502 | netif_warn(efx, hw, efx->net_dev, |
| 503 | "PTP bad synchronisation seconds\n"); |
| 504 | return -EAGAIN; |
| 505 | } else { |
| 506 | delta.tv_sec = 1; |
| 507 | } |
| 508 | } else { |
| 509 | delta.tv_sec = 0; |
| 510 | } |
| 511 | |
| 512 | ptp->host_time_pps = *last_time; |
| 513 | pps_sub_ts(&ptp->host_time_pps, delta); |
| 514 | |
| 515 | return 0; |
| 516 | } |
| 517 | |
| 518 | /* Synchronize times between the host and the MC */ |
| 519 | static int efx_ptp_synchronize(struct efx_nic *efx, unsigned int num_readings) |
| 520 | { |
| 521 | struct efx_ptp_data *ptp = efx->ptp_data; |
Ben Hutchings | 59cfc47 | 2012-09-14 17:30:10 +0100 | [diff] [blame] | 522 | MCDI_DECLARE_BUF(synch_buf, MC_CMD_PTP_OUT_SYNCHRONIZE_LENMAX); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 523 | size_t response_length; |
| 524 | int rc; |
| 525 | unsigned long timeout; |
| 526 | struct pps_event_time last_time = {}; |
| 527 | unsigned int loops = 0; |
| 528 | int *start = ptp->start.addr; |
| 529 | |
| 530 | MCDI_SET_DWORD(synch_buf, PTP_IN_OP, MC_CMD_PTP_OP_SYNCHRONIZE); |
Laurence Evans | c1d828b | 2013-03-06 15:33:17 +0000 | [diff] [blame] | 531 | MCDI_SET_DWORD(synch_buf, PTP_IN_PERIPH_ID, 0); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 532 | MCDI_SET_DWORD(synch_buf, PTP_IN_SYNCHRONIZE_NUMTIMESETS, |
| 533 | num_readings); |
Ben Hutchings | 338f74d | 2012-10-10 23:20:17 +0100 | [diff] [blame] | 534 | MCDI_SET_QWORD(synch_buf, PTP_IN_SYNCHRONIZE_START_ADDR, |
| 535 | ptp->start.dma_addr); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 536 | |
| 537 | /* Clear flag that signals MC ready */ |
| 538 | ACCESS_ONCE(*start) = 0; |
Ben Hutchings | df2cd8a | 2012-09-19 00:56:18 +0100 | [diff] [blame] | 539 | rc = efx_mcdi_rpc_start(efx, MC_CMD_PTP, synch_buf, |
| 540 | MC_CMD_PTP_IN_SYNCHRONIZE_LEN); |
| 541 | EFX_BUG_ON_PARANOID(rc); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 542 | |
| 543 | /* Wait for start from MCDI (or timeout) */ |
| 544 | timeout = jiffies + msecs_to_jiffies(MAX_SYNCHRONISE_WAIT_MS); |
| 545 | while (!ACCESS_ONCE(*start) && (time_before(jiffies, timeout))) { |
| 546 | udelay(20); /* Usually start MCDI execution quickly */ |
| 547 | loops++; |
| 548 | } |
| 549 | |
| 550 | if (ACCESS_ONCE(*start)) |
| 551 | efx_ptp_send_times(efx, &last_time); |
| 552 | |
| 553 | /* Collect results */ |
| 554 | rc = efx_mcdi_rpc_finish(efx, MC_CMD_PTP, |
| 555 | MC_CMD_PTP_IN_SYNCHRONIZE_LEN, |
| 556 | synch_buf, sizeof(synch_buf), |
| 557 | &response_length); |
| 558 | if (rc == 0) |
| 559 | rc = efx_ptp_process_times(efx, synch_buf, response_length, |
| 560 | &last_time); |
| 561 | |
| 562 | return rc; |
| 563 | } |
| 564 | |
| 565 | /* Transmit a PTP packet, via the MCDI interface, to the wire. */ |
| 566 | static int efx_ptp_xmit_skb(struct efx_nic *efx, struct sk_buff *skb) |
| 567 | { |
Ben Hutchings | c5bb0e9 | 2012-09-14 17:31:33 +0100 | [diff] [blame] | 568 | struct efx_ptp_data *ptp_data = efx->ptp_data; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 569 | struct skb_shared_hwtstamps timestamps; |
| 570 | int rc = -EIO; |
Ben Hutchings | 59cfc47 | 2012-09-14 17:30:10 +0100 | [diff] [blame] | 571 | MCDI_DECLARE_BUF(txtime, MC_CMD_PTP_OUT_TRANSMIT_LEN); |
Ben Hutchings | 9528b92 | 2012-09-14 17:31:41 +0100 | [diff] [blame] | 572 | size_t len; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 573 | |
Ben Hutchings | c5bb0e9 | 2012-09-14 17:31:33 +0100 | [diff] [blame] | 574 | MCDI_SET_DWORD(ptp_data->txbuf, PTP_IN_OP, MC_CMD_PTP_OP_TRANSMIT); |
Laurence Evans | c1d828b | 2013-03-06 15:33:17 +0000 | [diff] [blame] | 575 | MCDI_SET_DWORD(ptp_data->txbuf, PTP_IN_PERIPH_ID, 0); |
Ben Hutchings | c5bb0e9 | 2012-09-14 17:31:33 +0100 | [diff] [blame] | 576 | MCDI_SET_DWORD(ptp_data->txbuf, PTP_IN_TRANSMIT_LENGTH, skb->len); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 577 | if (skb_shinfo(skb)->nr_frags != 0) { |
| 578 | rc = skb_linearize(skb); |
| 579 | if (rc != 0) |
| 580 | goto fail; |
| 581 | } |
| 582 | |
| 583 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 584 | rc = skb_checksum_help(skb); |
| 585 | if (rc != 0) |
| 586 | goto fail; |
| 587 | } |
| 588 | skb_copy_from_linear_data(skb, |
Ben Hutchings | c5bb0e9 | 2012-09-14 17:31:33 +0100 | [diff] [blame] | 589 | MCDI_PTR(ptp_data->txbuf, |
| 590 | PTP_IN_TRANSMIT_PACKET), |
Ben Hutchings | 9528b92 | 2012-09-14 17:31:41 +0100 | [diff] [blame] | 591 | skb->len); |
| 592 | rc = efx_mcdi_rpc(efx, MC_CMD_PTP, |
| 593 | ptp_data->txbuf, MC_CMD_PTP_IN_TRANSMIT_LEN(skb->len), |
| 594 | txtime, sizeof(txtime), &len); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 595 | if (rc != 0) |
| 596 | goto fail; |
| 597 | |
| 598 | memset(×tamps, 0, sizeof(timestamps)); |
| 599 | timestamps.hwtstamp = ktime_set( |
| 600 | MCDI_DWORD(txtime, PTP_OUT_TRANSMIT_SECONDS), |
| 601 | MCDI_DWORD(txtime, PTP_OUT_TRANSMIT_NANOSECONDS)); |
| 602 | |
| 603 | skb_tstamp_tx(skb, ×tamps); |
| 604 | |
| 605 | rc = 0; |
| 606 | |
| 607 | fail: |
| 608 | dev_kfree_skb(skb); |
| 609 | |
| 610 | return rc; |
| 611 | } |
| 612 | |
| 613 | static void efx_ptp_drop_time_expired_events(struct efx_nic *efx) |
| 614 | { |
| 615 | struct efx_ptp_data *ptp = efx->ptp_data; |
| 616 | struct list_head *cursor; |
| 617 | struct list_head *next; |
| 618 | |
| 619 | /* Drop time-expired events */ |
| 620 | spin_lock_bh(&ptp->evt_lock); |
| 621 | if (!list_empty(&ptp->evt_list)) { |
| 622 | list_for_each_safe(cursor, next, &ptp->evt_list) { |
| 623 | struct efx_ptp_event_rx *evt; |
| 624 | |
| 625 | evt = list_entry(cursor, struct efx_ptp_event_rx, |
| 626 | link); |
| 627 | if (time_after(jiffies, evt->expiry)) { |
Wei Yongjun | 9545f4e | 2012-10-07 03:41:50 +0000 | [diff] [blame] | 628 | list_move(&evt->link, &ptp->evt_free_list); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 629 | netif_warn(efx, hw, efx->net_dev, |
| 630 | "PTP rx event dropped\n"); |
| 631 | } |
| 632 | } |
| 633 | } |
Laurence Evans | f321160 | 2013-01-28 14:51:17 +0000 | [diff] [blame] | 634 | /* If the event overflow flag is set and the event list is now empty |
| 635 | * clear the flag to re-enable the overflow warning message. |
| 636 | */ |
| 637 | if (ptp->evt_overflow && list_empty(&ptp->evt_list)) |
| 638 | ptp->evt_overflow = false; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 639 | spin_unlock_bh(&ptp->evt_lock); |
| 640 | } |
| 641 | |
| 642 | static enum ptp_packet_state efx_ptp_match_rx(struct efx_nic *efx, |
| 643 | struct sk_buff *skb) |
| 644 | { |
| 645 | struct efx_ptp_data *ptp = efx->ptp_data; |
| 646 | bool evts_waiting; |
| 647 | struct list_head *cursor; |
| 648 | struct list_head *next; |
| 649 | struct efx_ptp_match *match; |
| 650 | enum ptp_packet_state rc = PTP_PACKET_STATE_UNMATCHED; |
| 651 | |
| 652 | spin_lock_bh(&ptp->evt_lock); |
| 653 | evts_waiting = !list_empty(&ptp->evt_list); |
| 654 | spin_unlock_bh(&ptp->evt_lock); |
| 655 | |
| 656 | if (!evts_waiting) |
| 657 | return PTP_PACKET_STATE_UNMATCHED; |
| 658 | |
| 659 | match = (struct efx_ptp_match *)skb->cb; |
| 660 | /* Look for a matching timestamp in the event queue */ |
| 661 | spin_lock_bh(&ptp->evt_lock); |
| 662 | list_for_each_safe(cursor, next, &ptp->evt_list) { |
| 663 | struct efx_ptp_event_rx *evt; |
| 664 | |
| 665 | evt = list_entry(cursor, struct efx_ptp_event_rx, link); |
| 666 | if ((evt->seq0 == match->words[0]) && |
| 667 | (evt->seq1 == match->words[1])) { |
| 668 | struct skb_shared_hwtstamps *timestamps; |
| 669 | |
| 670 | /* Match - add in hardware timestamp */ |
| 671 | timestamps = skb_hwtstamps(skb); |
| 672 | timestamps->hwtstamp = evt->hwtimestamp; |
| 673 | |
| 674 | match->state = PTP_PACKET_STATE_MATCHED; |
| 675 | rc = PTP_PACKET_STATE_MATCHED; |
Wei Yongjun | 9545f4e | 2012-10-07 03:41:50 +0000 | [diff] [blame] | 676 | list_move(&evt->link, &ptp->evt_free_list); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 677 | break; |
| 678 | } |
| 679 | } |
Laurence Evans | f321160 | 2013-01-28 14:51:17 +0000 | [diff] [blame] | 680 | /* If the event overflow flag is set and the event list is now empty |
| 681 | * clear the flag to re-enable the overflow warning message. |
| 682 | */ |
| 683 | if (ptp->evt_overflow && list_empty(&ptp->evt_list)) |
| 684 | ptp->evt_overflow = false; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 685 | spin_unlock_bh(&ptp->evt_lock); |
| 686 | |
| 687 | return rc; |
| 688 | } |
| 689 | |
| 690 | /* Process any queued receive events and corresponding packets |
| 691 | * |
| 692 | * q is returned with all the packets that are ready for delivery. |
| 693 | * true is returned if at least one of those packets requires |
| 694 | * synchronisation. |
| 695 | */ |
| 696 | static bool efx_ptp_process_events(struct efx_nic *efx, struct sk_buff_head *q) |
| 697 | { |
| 698 | struct efx_ptp_data *ptp = efx->ptp_data; |
| 699 | bool rc = false; |
| 700 | struct sk_buff *skb; |
| 701 | |
| 702 | while ((skb = skb_dequeue(&ptp->rxq))) { |
| 703 | struct efx_ptp_match *match; |
| 704 | |
| 705 | match = (struct efx_ptp_match *)skb->cb; |
| 706 | if (match->state == PTP_PACKET_STATE_MATCH_UNWANTED) { |
| 707 | __skb_queue_tail(q, skb); |
| 708 | } else if (efx_ptp_match_rx(efx, skb) == |
| 709 | PTP_PACKET_STATE_MATCHED) { |
| 710 | rc = true; |
| 711 | __skb_queue_tail(q, skb); |
| 712 | } else if (time_after(jiffies, match->expiry)) { |
| 713 | match->state = PTP_PACKET_STATE_TIMED_OUT; |
Ben Hutchings | 35f9a7a | 2013-12-06 22:10:46 +0000 | [diff] [blame] | 714 | if (net_ratelimit()) |
| 715 | netif_warn(efx, rx_err, efx->net_dev, |
| 716 | "PTP packet - no timestamp seen\n"); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 717 | __skb_queue_tail(q, skb); |
| 718 | } else { |
| 719 | /* Replace unprocessed entry and stop */ |
| 720 | skb_queue_head(&ptp->rxq, skb); |
| 721 | break; |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | return rc; |
| 726 | } |
| 727 | |
| 728 | /* Complete processing of a received packet */ |
| 729 | static inline void efx_ptp_process_rx(struct efx_nic *efx, struct sk_buff *skb) |
| 730 | { |
| 731 | local_bh_disable(); |
| 732 | netif_receive_skb(skb); |
| 733 | local_bh_enable(); |
| 734 | } |
| 735 | |
Ben Hutchings | 62a1c70 | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 736 | static void efx_ptp_remove_multicast_filters(struct efx_nic *efx) |
| 737 | { |
| 738 | struct efx_ptp_data *ptp = efx->ptp_data; |
| 739 | |
| 740 | if (ptp->rxfilter_installed) { |
| 741 | efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, |
| 742 | ptp->rxfilter_general); |
| 743 | efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, |
| 744 | ptp->rxfilter_event); |
| 745 | ptp->rxfilter_installed = false; |
| 746 | } |
| 747 | } |
| 748 | |
| 749 | static int efx_ptp_insert_multicast_filters(struct efx_nic *efx) |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 750 | { |
| 751 | struct efx_ptp_data *ptp = efx->ptp_data; |
| 752 | struct efx_filter_spec rxfilter; |
| 753 | int rc; |
| 754 | |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 755 | if (!ptp->channel || ptp->rxfilter_installed) |
Ben Hutchings | 62a1c70 | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 756 | return 0; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 757 | |
| 758 | /* Must filter on both event and general ports to ensure |
| 759 | * that there is no packet re-ordering. |
| 760 | */ |
| 761 | efx_filter_init_rx(&rxfilter, EFX_FILTER_PRI_REQUIRED, 0, |
| 762 | efx_rx_queue_index( |
| 763 | efx_channel_get_rx_queue(ptp->channel))); |
| 764 | rc = efx_filter_set_ipv4_local(&rxfilter, IPPROTO_UDP, |
| 765 | htonl(PTP_ADDRESS), |
| 766 | htons(PTP_EVENT_PORT)); |
| 767 | if (rc != 0) |
| 768 | return rc; |
| 769 | |
| 770 | rc = efx_filter_insert_filter(efx, &rxfilter, true); |
| 771 | if (rc < 0) |
| 772 | return rc; |
| 773 | ptp->rxfilter_event = rc; |
| 774 | |
| 775 | efx_filter_init_rx(&rxfilter, EFX_FILTER_PRI_REQUIRED, 0, |
| 776 | efx_rx_queue_index( |
| 777 | efx_channel_get_rx_queue(ptp->channel))); |
| 778 | rc = efx_filter_set_ipv4_local(&rxfilter, IPPROTO_UDP, |
| 779 | htonl(PTP_ADDRESS), |
| 780 | htons(PTP_GENERAL_PORT)); |
| 781 | if (rc != 0) |
| 782 | goto fail; |
| 783 | |
| 784 | rc = efx_filter_insert_filter(efx, &rxfilter, true); |
| 785 | if (rc < 0) |
| 786 | goto fail; |
| 787 | ptp->rxfilter_general = rc; |
| 788 | |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 789 | ptp->rxfilter_installed = true; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 790 | return 0; |
| 791 | |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 792 | fail: |
| 793 | efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, |
| 794 | ptp->rxfilter_event); |
Ben Hutchings | 62a1c70 | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 795 | return rc; |
| 796 | } |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 797 | |
Ben Hutchings | 62a1c70 | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 798 | static int efx_ptp_start(struct efx_nic *efx) |
| 799 | { |
| 800 | struct efx_ptp_data *ptp = efx->ptp_data; |
| 801 | int rc; |
| 802 | |
| 803 | ptp->reset_required = false; |
| 804 | |
| 805 | rc = efx_ptp_insert_multicast_filters(efx); |
| 806 | if (rc) |
| 807 | return rc; |
| 808 | |
| 809 | rc = efx_ptp_enable(efx); |
| 810 | if (rc != 0) |
| 811 | goto fail; |
| 812 | |
| 813 | ptp->evt_frag_idx = 0; |
| 814 | ptp->current_adjfreq = 0; |
| 815 | |
| 816 | return 0; |
| 817 | |
| 818 | fail: |
| 819 | efx_ptp_remove_multicast_filters(efx); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 820 | return rc; |
| 821 | } |
| 822 | |
| 823 | static int efx_ptp_stop(struct efx_nic *efx) |
| 824 | { |
| 825 | struct efx_ptp_data *ptp = efx->ptp_data; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 826 | struct list_head *cursor; |
| 827 | struct list_head *next; |
Alexandre Rames | 2ea4dc2 | 2013-11-08 10:20:31 +0000 | [diff] [blame] | 828 | int rc; |
| 829 | |
| 830 | if (ptp == NULL) |
| 831 | return 0; |
| 832 | |
| 833 | rc = efx_ptp_disable(efx); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 834 | |
Ben Hutchings | 62a1c70 | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 835 | efx_ptp_remove_multicast_filters(efx); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 836 | |
| 837 | /* Make sure RX packets are really delivered */ |
| 838 | efx_ptp_deliver_rx_queue(&efx->ptp_data->rxq); |
| 839 | skb_queue_purge(&efx->ptp_data->txq); |
| 840 | |
| 841 | /* Drop any pending receive events */ |
| 842 | spin_lock_bh(&efx->ptp_data->evt_lock); |
| 843 | list_for_each_safe(cursor, next, &efx->ptp_data->evt_list) { |
Wei Yongjun | 9545f4e | 2012-10-07 03:41:50 +0000 | [diff] [blame] | 844 | list_move(cursor, &efx->ptp_data->evt_free_list); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 845 | } |
Laurence Evans | f321160 | 2013-01-28 14:51:17 +0000 | [diff] [blame] | 846 | ptp->evt_overflow = false; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 847 | spin_unlock_bh(&efx->ptp_data->evt_lock); |
| 848 | |
| 849 | return rc; |
| 850 | } |
| 851 | |
Alexandre Rames | 2ea4dc2 | 2013-11-08 10:20:31 +0000 | [diff] [blame] | 852 | static int efx_ptp_restart(struct efx_nic *efx) |
| 853 | { |
| 854 | if (efx->ptp_data && efx->ptp_data->enabled) |
| 855 | return efx_ptp_start(efx); |
| 856 | return 0; |
| 857 | } |
| 858 | |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 859 | static void efx_ptp_pps_worker(struct work_struct *work) |
| 860 | { |
| 861 | struct efx_ptp_data *ptp = |
| 862 | container_of(work, struct efx_ptp_data, pps_work); |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 863 | struct efx_nic *efx = ptp->efx; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 864 | struct ptp_clock_event ptp_evt; |
| 865 | |
| 866 | if (efx_ptp_synchronize(efx, PTP_SYNC_ATTEMPTS)) |
| 867 | return; |
| 868 | |
| 869 | ptp_evt.type = PTP_CLOCK_PPSUSR; |
| 870 | ptp_evt.pps_times = ptp->host_time_pps; |
| 871 | ptp_clock_event(ptp->phc_clock, &ptp_evt); |
| 872 | } |
| 873 | |
| 874 | /* Process any pending transmissions and timestamp any received packets. |
| 875 | */ |
| 876 | static void efx_ptp_worker(struct work_struct *work) |
| 877 | { |
| 878 | struct efx_ptp_data *ptp_data = |
| 879 | container_of(work, struct efx_ptp_data, work); |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 880 | struct efx_nic *efx = ptp_data->efx; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 881 | struct sk_buff *skb; |
| 882 | struct sk_buff_head tempq; |
| 883 | |
| 884 | if (ptp_data->reset_required) { |
| 885 | efx_ptp_stop(efx); |
| 886 | efx_ptp_start(efx); |
| 887 | return; |
| 888 | } |
| 889 | |
| 890 | efx_ptp_drop_time_expired_events(efx); |
| 891 | |
| 892 | __skb_queue_head_init(&tempq); |
| 893 | if (efx_ptp_process_events(efx, &tempq) || |
| 894 | !skb_queue_empty(&ptp_data->txq)) { |
| 895 | |
| 896 | while ((skb = skb_dequeue(&ptp_data->txq))) |
| 897 | efx_ptp_xmit_skb(efx, skb); |
| 898 | } |
| 899 | |
| 900 | while ((skb = __skb_dequeue(&tempq))) |
| 901 | efx_ptp_process_rx(efx, skb); |
| 902 | } |
| 903 | |
Ben Hutchings | 5d0dab0 | 2013-10-16 18:32:41 +0100 | [diff] [blame] | 904 | static const struct ptp_clock_info efx_phc_clock_info = { |
| 905 | .owner = THIS_MODULE, |
| 906 | .name = "sfc", |
| 907 | .max_adj = MAX_PPB, |
| 908 | .n_alarm = 0, |
| 909 | .n_ext_ts = 0, |
| 910 | .n_per_out = 0, |
| 911 | .pps = 1, |
| 912 | .adjfreq = efx_phc_adjfreq, |
| 913 | .adjtime = efx_phc_adjtime, |
| 914 | .gettime = efx_phc_gettime, |
| 915 | .settime = efx_phc_settime, |
| 916 | .enable = efx_phc_enable, |
| 917 | }; |
| 918 | |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 919 | /* Initialise PTP state. */ |
| 920 | int efx_ptp_probe(struct efx_nic *efx, struct efx_channel *channel) |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 921 | { |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 922 | struct efx_ptp_data *ptp; |
| 923 | int rc = 0; |
| 924 | unsigned int pos; |
| 925 | |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 926 | ptp = kzalloc(sizeof(struct efx_ptp_data), GFP_KERNEL); |
| 927 | efx->ptp_data = ptp; |
| 928 | if (!efx->ptp_data) |
| 929 | return -ENOMEM; |
| 930 | |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 931 | ptp->efx = efx; |
| 932 | ptp->channel = channel; |
| 933 | |
Ben Hutchings | 0d19a54 | 2012-09-18 21:59:52 +0100 | [diff] [blame] | 934 | rc = efx_nic_alloc_buffer(efx, &ptp->start, sizeof(int), GFP_KERNEL); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 935 | if (rc != 0) |
| 936 | goto fail1; |
| 937 | |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 938 | skb_queue_head_init(&ptp->rxq); |
| 939 | skb_queue_head_init(&ptp->txq); |
| 940 | ptp->workwq = create_singlethread_workqueue("sfc_ptp"); |
| 941 | if (!ptp->workwq) { |
| 942 | rc = -ENOMEM; |
| 943 | goto fail2; |
| 944 | } |
| 945 | |
| 946 | INIT_WORK(&ptp->work, efx_ptp_worker); |
| 947 | ptp->config.flags = 0; |
| 948 | ptp->config.tx_type = HWTSTAMP_TX_OFF; |
| 949 | ptp->config.rx_filter = HWTSTAMP_FILTER_NONE; |
| 950 | INIT_LIST_HEAD(&ptp->evt_list); |
| 951 | INIT_LIST_HEAD(&ptp->evt_free_list); |
| 952 | spin_lock_init(&ptp->evt_lock); |
| 953 | for (pos = 0; pos < MAX_RECEIVE_EVENTS; pos++) |
| 954 | list_add(&ptp->rx_evts[pos].link, &ptp->evt_free_list); |
Laurence Evans | f321160 | 2013-01-28 14:51:17 +0000 | [diff] [blame] | 955 | ptp->evt_overflow = false; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 956 | |
Ben Hutchings | 5d0dab0 | 2013-10-16 18:32:41 +0100 | [diff] [blame] | 957 | ptp->phc_clock_info = efx_phc_clock_info; |
Richard Cochran | 1ef7615 | 2012-09-22 07:02:03 +0000 | [diff] [blame] | 958 | ptp->phc_clock = ptp_clock_register(&ptp->phc_clock_info, |
| 959 | &efx->pci_dev->dev); |
Wei Yongjun | 155d940 | 2013-05-07 02:19:25 +0000 | [diff] [blame] | 960 | if (IS_ERR(ptp->phc_clock)) { |
| 961 | rc = PTR_ERR(ptp->phc_clock); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 962 | goto fail3; |
Wei Yongjun | 155d940 | 2013-05-07 02:19:25 +0000 | [diff] [blame] | 963 | } |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 964 | |
| 965 | INIT_WORK(&ptp->pps_work, efx_ptp_pps_worker); |
| 966 | ptp->pps_workwq = create_singlethread_workqueue("sfc_pps"); |
| 967 | if (!ptp->pps_workwq) { |
| 968 | rc = -ENOMEM; |
| 969 | goto fail4; |
| 970 | } |
| 971 | ptp->nic_ts_enabled = false; |
| 972 | |
| 973 | return 0; |
| 974 | fail4: |
| 975 | ptp_clock_unregister(efx->ptp_data->phc_clock); |
| 976 | |
| 977 | fail3: |
| 978 | destroy_workqueue(efx->ptp_data->workwq); |
| 979 | |
| 980 | fail2: |
| 981 | efx_nic_free_buffer(efx, &ptp->start); |
| 982 | |
| 983 | fail1: |
| 984 | kfree(efx->ptp_data); |
| 985 | efx->ptp_data = NULL; |
| 986 | |
| 987 | return rc; |
| 988 | } |
| 989 | |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 990 | /* Initialise PTP channel. |
| 991 | * |
| 992 | * Setting core_index to zero causes the queue to be initialised and doesn't |
| 993 | * overlap with 'rxq0' because ptp.c doesn't use skb_record_rx_queue. |
| 994 | */ |
| 995 | static int efx_ptp_probe_channel(struct efx_channel *channel) |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 996 | { |
| 997 | struct efx_nic *efx = channel->efx; |
| 998 | |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 999 | channel->irq_moderation = 0; |
| 1000 | channel->rx_queue.core_index = 0; |
| 1001 | |
| 1002 | return efx_ptp_probe(efx, channel); |
| 1003 | } |
| 1004 | |
| 1005 | void efx_ptp_remove(struct efx_nic *efx) |
| 1006 | { |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1007 | if (!efx->ptp_data) |
| 1008 | return; |
| 1009 | |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 1010 | (void)efx_ptp_disable(efx); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1011 | |
| 1012 | cancel_work_sync(&efx->ptp_data->work); |
| 1013 | cancel_work_sync(&efx->ptp_data->pps_work); |
| 1014 | |
| 1015 | skb_queue_purge(&efx->ptp_data->rxq); |
| 1016 | skb_queue_purge(&efx->ptp_data->txq); |
| 1017 | |
| 1018 | ptp_clock_unregister(efx->ptp_data->phc_clock); |
| 1019 | |
| 1020 | destroy_workqueue(efx->ptp_data->workwq); |
| 1021 | destroy_workqueue(efx->ptp_data->pps_workwq); |
| 1022 | |
| 1023 | efx_nic_free_buffer(efx, &efx->ptp_data->start); |
| 1024 | kfree(efx->ptp_data); |
| 1025 | } |
| 1026 | |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 1027 | static void efx_ptp_remove_channel(struct efx_channel *channel) |
| 1028 | { |
| 1029 | efx_ptp_remove(channel->efx); |
| 1030 | } |
| 1031 | |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1032 | static void efx_ptp_get_channel_name(struct efx_channel *channel, |
| 1033 | char *buf, size_t len) |
| 1034 | { |
| 1035 | snprintf(buf, len, "%s-ptp", channel->efx->name); |
| 1036 | } |
| 1037 | |
| 1038 | /* Determine whether this packet should be processed by the PTP module |
| 1039 | * or transmitted conventionally. |
| 1040 | */ |
| 1041 | bool efx_ptp_is_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) |
| 1042 | { |
| 1043 | return efx->ptp_data && |
| 1044 | efx->ptp_data->enabled && |
| 1045 | skb->len >= PTP_MIN_LENGTH && |
| 1046 | skb->len <= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM && |
| 1047 | likely(skb->protocol == htons(ETH_P_IP)) && |
Ben Hutchings | e5a498e | 2013-12-06 19:26:40 +0000 | [diff] [blame] | 1048 | skb_transport_header_was_set(skb) && |
| 1049 | skb_network_header_len(skb) >= sizeof(struct iphdr) && |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1050 | ip_hdr(skb)->protocol == IPPROTO_UDP && |
Ben Hutchings | e5a498e | 2013-12-06 19:26:40 +0000 | [diff] [blame] | 1051 | skb_headlen(skb) >= |
| 1052 | skb_transport_offset(skb) + sizeof(struct udphdr) && |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1053 | udp_hdr(skb)->dest == htons(PTP_EVENT_PORT); |
| 1054 | } |
| 1055 | |
| 1056 | /* Receive a PTP packet. Packets are queued until the arrival of |
| 1057 | * the receive timestamp from the MC - this will probably occur after the |
| 1058 | * packet arrival because of the processing in the MC. |
| 1059 | */ |
Ben Hutchings | 4a74dc6 | 2013-03-05 20:13:54 +0000 | [diff] [blame] | 1060 | static bool efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb) |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1061 | { |
| 1062 | struct efx_nic *efx = channel->efx; |
| 1063 | struct efx_ptp_data *ptp = efx->ptp_data; |
| 1064 | struct efx_ptp_match *match = (struct efx_ptp_match *)skb->cb; |
Laurence Evans | c939a31 | 2012-11-15 10:56:07 +0000 | [diff] [blame] | 1065 | u8 *match_data_012, *match_data_345; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1066 | unsigned int version; |
| 1067 | |
| 1068 | match->expiry = jiffies + msecs_to_jiffies(PKT_EVENT_LIFETIME_MS); |
| 1069 | |
| 1070 | /* Correct version? */ |
| 1071 | if (ptp->mode == MC_CMD_PTP_MODE_V1) { |
Alexandre Rames | 97d48a1 | 2013-01-11 12:26:21 +0000 | [diff] [blame] | 1072 | if (!pskb_may_pull(skb, PTP_V1_MIN_LENGTH)) { |
Ben Hutchings | 4a74dc6 | 2013-03-05 20:13:54 +0000 | [diff] [blame] | 1073 | return false; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1074 | } |
| 1075 | version = ntohs(*(__be16 *)&skb->data[PTP_V1_VERSION_OFFSET]); |
| 1076 | if (version != PTP_VERSION_V1) { |
Ben Hutchings | 4a74dc6 | 2013-03-05 20:13:54 +0000 | [diff] [blame] | 1077 | return false; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1078 | } |
Laurence Evans | c939a31 | 2012-11-15 10:56:07 +0000 | [diff] [blame] | 1079 | |
| 1080 | /* PTP V1 uses all six bytes of the UUID to match the packet |
| 1081 | * to the timestamp |
| 1082 | */ |
| 1083 | match_data_012 = skb->data + PTP_V1_UUID_OFFSET; |
| 1084 | match_data_345 = skb->data + PTP_V1_UUID_OFFSET + 3; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1085 | } else { |
Alexandre Rames | 97d48a1 | 2013-01-11 12:26:21 +0000 | [diff] [blame] | 1086 | if (!pskb_may_pull(skb, PTP_V2_MIN_LENGTH)) { |
Ben Hutchings | 4a74dc6 | 2013-03-05 20:13:54 +0000 | [diff] [blame] | 1087 | return false; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1088 | } |
| 1089 | version = skb->data[PTP_V2_VERSION_OFFSET]; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1090 | if ((version & PTP_VERSION_V2_MASK) != PTP_VERSION_V2) { |
Ben Hutchings | 4a74dc6 | 2013-03-05 20:13:54 +0000 | [diff] [blame] | 1091 | return false; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1092 | } |
Laurence Evans | c939a31 | 2012-11-15 10:56:07 +0000 | [diff] [blame] | 1093 | |
| 1094 | /* The original V2 implementation uses bytes 2-7 of |
| 1095 | * the UUID to match the packet to the timestamp. This |
| 1096 | * discards two of the bytes of the MAC address used |
| 1097 | * to create the UUID (SF bug 33070). The PTP V2 |
| 1098 | * enhanced mode fixes this issue and uses bytes 0-2 |
| 1099 | * and byte 5-7 of the UUID. |
| 1100 | */ |
| 1101 | match_data_345 = skb->data + PTP_V2_UUID_OFFSET + 5; |
| 1102 | if (ptp->mode == MC_CMD_PTP_MODE_V2) { |
| 1103 | match_data_012 = skb->data + PTP_V2_UUID_OFFSET + 2; |
| 1104 | } else { |
| 1105 | match_data_012 = skb->data + PTP_V2_UUID_OFFSET + 0; |
| 1106 | BUG_ON(ptp->mode != MC_CMD_PTP_MODE_V2_ENHANCED); |
| 1107 | } |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1108 | } |
| 1109 | |
| 1110 | /* Does this packet require timestamping? */ |
| 1111 | if (ntohs(*(__be16 *)&skb->data[PTP_DPORT_OFFSET]) == PTP_EVENT_PORT) { |
| 1112 | struct skb_shared_hwtstamps *timestamps; |
| 1113 | |
| 1114 | match->state = PTP_PACKET_STATE_UNMATCHED; |
| 1115 | |
| 1116 | /* Clear all timestamps held: filled in later */ |
| 1117 | timestamps = skb_hwtstamps(skb); |
| 1118 | memset(timestamps, 0, sizeof(*timestamps)); |
| 1119 | |
Laurence Evans | c939a31 | 2012-11-15 10:56:07 +0000 | [diff] [blame] | 1120 | /* We expect the sequence number to be in the same position in |
| 1121 | * the packet for PTP V1 and V2 |
| 1122 | */ |
| 1123 | BUILD_BUG_ON(PTP_V1_SEQUENCE_OFFSET != PTP_V2_SEQUENCE_OFFSET); |
| 1124 | BUILD_BUG_ON(PTP_V1_SEQUENCE_LENGTH != PTP_V2_SEQUENCE_LENGTH); |
| 1125 | |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1126 | /* Extract UUID/Sequence information */ |
Laurence Evans | c939a31 | 2012-11-15 10:56:07 +0000 | [diff] [blame] | 1127 | match->words[0] = (match_data_012[0] | |
| 1128 | (match_data_012[1] << 8) | |
| 1129 | (match_data_012[2] << 16) | |
| 1130 | (match_data_345[0] << 24)); |
| 1131 | match->words[1] = (match_data_345[1] | |
| 1132 | (match_data_345[2] << 8) | |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1133 | (skb->data[PTP_V1_SEQUENCE_OFFSET + |
| 1134 | PTP_V1_SEQUENCE_LENGTH - 1] << |
| 1135 | 16)); |
| 1136 | } else { |
| 1137 | match->state = PTP_PACKET_STATE_MATCH_UNWANTED; |
| 1138 | } |
| 1139 | |
| 1140 | skb_queue_tail(&ptp->rxq, skb); |
| 1141 | queue_work(ptp->workwq, &ptp->work); |
Ben Hutchings | 4a74dc6 | 2013-03-05 20:13:54 +0000 | [diff] [blame] | 1142 | |
| 1143 | return true; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1144 | } |
| 1145 | |
| 1146 | /* Transmit a PTP packet. This has to be transmitted by the MC |
| 1147 | * itself, through an MCDI call. MCDI calls aren't permitted |
| 1148 | * in the transmit path so defer the actual transmission to a suitable worker. |
| 1149 | */ |
| 1150 | int efx_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) |
| 1151 | { |
| 1152 | struct efx_ptp_data *ptp = efx->ptp_data; |
| 1153 | |
| 1154 | skb_queue_tail(&ptp->txq, skb); |
| 1155 | |
| 1156 | if ((udp_hdr(skb)->dest == htons(PTP_EVENT_PORT)) && |
| 1157 | (skb->len <= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM)) |
| 1158 | efx_xmit_hwtstamp_pending(skb); |
| 1159 | queue_work(ptp->workwq, &ptp->work); |
| 1160 | |
| 1161 | return NETDEV_TX_OK; |
| 1162 | } |
| 1163 | |
| 1164 | static int efx_ptp_change_mode(struct efx_nic *efx, bool enable_wanted, |
| 1165 | unsigned int new_mode) |
| 1166 | { |
| 1167 | if ((enable_wanted != efx->ptp_data->enabled) || |
| 1168 | (enable_wanted && (efx->ptp_data->mode != new_mode))) { |
Alexandre Rames | 2ea4dc2 | 2013-11-08 10:20:31 +0000 | [diff] [blame] | 1169 | int rc = 0; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1170 | |
| 1171 | if (enable_wanted) { |
| 1172 | /* Change of mode requires disable */ |
| 1173 | if (efx->ptp_data->enabled && |
| 1174 | (efx->ptp_data->mode != new_mode)) { |
| 1175 | efx->ptp_data->enabled = false; |
| 1176 | rc = efx_ptp_stop(efx); |
| 1177 | if (rc != 0) |
| 1178 | return rc; |
| 1179 | } |
| 1180 | |
| 1181 | /* Set new operating mode and establish |
| 1182 | * baseline synchronisation, which must |
| 1183 | * succeed. |
| 1184 | */ |
| 1185 | efx->ptp_data->mode = new_mode; |
Alexandre Rames | 2ea4dc2 | 2013-11-08 10:20:31 +0000 | [diff] [blame] | 1186 | if (netif_running(efx->net_dev)) |
| 1187 | rc = efx_ptp_start(efx); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1188 | if (rc == 0) { |
| 1189 | rc = efx_ptp_synchronize(efx, |
| 1190 | PTP_SYNC_ATTEMPTS * 2); |
| 1191 | if (rc != 0) |
| 1192 | efx_ptp_stop(efx); |
| 1193 | } |
| 1194 | } else { |
| 1195 | rc = efx_ptp_stop(efx); |
| 1196 | } |
| 1197 | |
| 1198 | if (rc != 0) |
| 1199 | return rc; |
| 1200 | |
| 1201 | efx->ptp_data->enabled = enable_wanted; |
| 1202 | } |
| 1203 | |
| 1204 | return 0; |
| 1205 | } |
| 1206 | |
| 1207 | static int efx_ptp_ts_init(struct efx_nic *efx, struct hwtstamp_config *init) |
| 1208 | { |
| 1209 | bool enable_wanted = false; |
| 1210 | unsigned int new_mode; |
| 1211 | int rc; |
| 1212 | |
| 1213 | if (init->flags) |
| 1214 | return -EINVAL; |
| 1215 | |
| 1216 | if ((init->tx_type != HWTSTAMP_TX_OFF) && |
| 1217 | (init->tx_type != HWTSTAMP_TX_ON)) |
| 1218 | return -ERANGE; |
| 1219 | |
| 1220 | new_mode = efx->ptp_data->mode; |
| 1221 | /* Determine whether any PTP HW operations are required */ |
| 1222 | switch (init->rx_filter) { |
| 1223 | case HWTSTAMP_FILTER_NONE: |
| 1224 | break; |
| 1225 | case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: |
| 1226 | case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: |
| 1227 | case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: |
| 1228 | init->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT; |
| 1229 | new_mode = MC_CMD_PTP_MODE_V1; |
| 1230 | enable_wanted = true; |
| 1231 | break; |
| 1232 | case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: |
| 1233 | case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: |
| 1234 | case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: |
| 1235 | /* Although these three are accepted only IPV4 packets will be |
| 1236 | * timestamped |
| 1237 | */ |
| 1238 | init->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT; |
Laurence Evans | c939a31 | 2012-11-15 10:56:07 +0000 | [diff] [blame] | 1239 | new_mode = MC_CMD_PTP_MODE_V2_ENHANCED; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1240 | enable_wanted = true; |
| 1241 | break; |
| 1242 | case HWTSTAMP_FILTER_PTP_V2_EVENT: |
| 1243 | case HWTSTAMP_FILTER_PTP_V2_SYNC: |
| 1244 | case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: |
| 1245 | case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: |
| 1246 | case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: |
| 1247 | case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: |
| 1248 | /* Non-IP + IPv6 timestamping not supported */ |
| 1249 | return -ERANGE; |
| 1250 | break; |
| 1251 | default: |
| 1252 | return -ERANGE; |
| 1253 | } |
| 1254 | |
| 1255 | if (init->tx_type != HWTSTAMP_TX_OFF) |
| 1256 | enable_wanted = true; |
| 1257 | |
Laurence Evans | c939a31 | 2012-11-15 10:56:07 +0000 | [diff] [blame] | 1258 | /* Old versions of the firmware do not support the improved |
| 1259 | * UUID filtering option (SF bug 33070). If the firmware does |
| 1260 | * not accept the enhanced mode, fall back to the standard PTP |
| 1261 | * v2 UUID filtering. |
| 1262 | */ |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1263 | rc = efx_ptp_change_mode(efx, enable_wanted, new_mode); |
Laurence Evans | c939a31 | 2012-11-15 10:56:07 +0000 | [diff] [blame] | 1264 | if ((rc != 0) && (new_mode == MC_CMD_PTP_MODE_V2_ENHANCED)) |
| 1265 | rc = efx_ptp_change_mode(efx, enable_wanted, MC_CMD_PTP_MODE_V2); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1266 | if (rc != 0) |
| 1267 | return rc; |
| 1268 | |
| 1269 | efx->ptp_data->config = *init; |
| 1270 | |
| 1271 | return 0; |
| 1272 | } |
| 1273 | |
Ben Hutchings | 62ebac9 | 2013-04-08 17:34:58 +0100 | [diff] [blame] | 1274 | void efx_ptp_get_ts_info(struct efx_nic *efx, struct ethtool_ts_info *ts_info) |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1275 | { |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1276 | struct efx_ptp_data *ptp = efx->ptp_data; |
| 1277 | |
| 1278 | if (!ptp) |
Ben Hutchings | 62ebac9 | 2013-04-08 17:34:58 +0100 | [diff] [blame] | 1279 | return; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1280 | |
Ben Hutchings | 62ebac9 | 2013-04-08 17:34:58 +0100 | [diff] [blame] | 1281 | ts_info->so_timestamping |= (SOF_TIMESTAMPING_TX_HARDWARE | |
| 1282 | SOF_TIMESTAMPING_RX_HARDWARE | |
| 1283 | SOF_TIMESTAMPING_RAW_HARDWARE); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1284 | ts_info->phc_index = ptp_clock_index(ptp->phc_clock); |
| 1285 | ts_info->tx_types = 1 << HWTSTAMP_TX_OFF | 1 << HWTSTAMP_TX_ON; |
| 1286 | ts_info->rx_filters = (1 << HWTSTAMP_FILTER_NONE | |
| 1287 | 1 << HWTSTAMP_FILTER_PTP_V1_L4_EVENT | |
| 1288 | 1 << HWTSTAMP_FILTER_PTP_V1_L4_SYNC | |
| 1289 | 1 << HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ | |
| 1290 | 1 << HWTSTAMP_FILTER_PTP_V2_L4_EVENT | |
| 1291 | 1 << HWTSTAMP_FILTER_PTP_V2_L4_SYNC | |
| 1292 | 1 << HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1293 | } |
| 1294 | |
Ben Hutchings | 433dc9b | 2013-11-14 01:26:21 +0000 | [diff] [blame] | 1295 | int efx_ptp_set_ts_config(struct efx_nic *efx, struct ifreq *ifr) |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1296 | { |
| 1297 | struct hwtstamp_config config; |
| 1298 | int rc; |
| 1299 | |
| 1300 | /* Not a PTP enabled port */ |
| 1301 | if (!efx->ptp_data) |
| 1302 | return -EOPNOTSUPP; |
| 1303 | |
| 1304 | if (copy_from_user(&config, ifr->ifr_data, sizeof(config))) |
| 1305 | return -EFAULT; |
| 1306 | |
| 1307 | rc = efx_ptp_ts_init(efx, &config); |
| 1308 | if (rc != 0) |
| 1309 | return rc; |
| 1310 | |
| 1311 | return copy_to_user(ifr->ifr_data, &config, sizeof(config)) |
| 1312 | ? -EFAULT : 0; |
| 1313 | } |
| 1314 | |
Ben Hutchings | 433dc9b | 2013-11-14 01:26:21 +0000 | [diff] [blame] | 1315 | int efx_ptp_get_ts_config(struct efx_nic *efx, struct ifreq *ifr) |
| 1316 | { |
| 1317 | if (!efx->ptp_data) |
| 1318 | return -EOPNOTSUPP; |
| 1319 | |
| 1320 | return copy_to_user(ifr->ifr_data, &efx->ptp_data->config, |
| 1321 | sizeof(efx->ptp_data->config)) ? -EFAULT : 0; |
| 1322 | } |
| 1323 | |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1324 | static void ptp_event_failure(struct efx_nic *efx, int expected_frag_len) |
| 1325 | { |
| 1326 | struct efx_ptp_data *ptp = efx->ptp_data; |
| 1327 | |
| 1328 | netif_err(efx, hw, efx->net_dev, |
| 1329 | "PTP unexpected event length: got %d expected %d\n", |
| 1330 | ptp->evt_frag_idx, expected_frag_len); |
| 1331 | ptp->reset_required = true; |
| 1332 | queue_work(ptp->workwq, &ptp->work); |
| 1333 | } |
| 1334 | |
| 1335 | /* Process a completed receive event. Put it on the event queue and |
| 1336 | * start worker thread. This is required because event and their |
| 1337 | * correspoding packets may come in either order. |
| 1338 | */ |
| 1339 | static void ptp_event_rx(struct efx_nic *efx, struct efx_ptp_data *ptp) |
| 1340 | { |
| 1341 | struct efx_ptp_event_rx *evt = NULL; |
| 1342 | |
| 1343 | if (ptp->evt_frag_idx != 3) { |
| 1344 | ptp_event_failure(efx, 3); |
| 1345 | return; |
| 1346 | } |
| 1347 | |
| 1348 | spin_lock_bh(&ptp->evt_lock); |
| 1349 | if (!list_empty(&ptp->evt_free_list)) { |
| 1350 | evt = list_first_entry(&ptp->evt_free_list, |
| 1351 | struct efx_ptp_event_rx, link); |
| 1352 | list_del(&evt->link); |
| 1353 | |
| 1354 | evt->seq0 = EFX_QWORD_FIELD(ptp->evt_frags[2], MCDI_EVENT_DATA); |
| 1355 | evt->seq1 = (EFX_QWORD_FIELD(ptp->evt_frags[2], |
| 1356 | MCDI_EVENT_SRC) | |
| 1357 | (EFX_QWORD_FIELD(ptp->evt_frags[1], |
| 1358 | MCDI_EVENT_SRC) << 8) | |
| 1359 | (EFX_QWORD_FIELD(ptp->evt_frags[0], |
| 1360 | MCDI_EVENT_SRC) << 16)); |
| 1361 | evt->hwtimestamp = ktime_set( |
| 1362 | EFX_QWORD_FIELD(ptp->evt_frags[0], MCDI_EVENT_DATA), |
| 1363 | EFX_QWORD_FIELD(ptp->evt_frags[1], MCDI_EVENT_DATA)); |
| 1364 | evt->expiry = jiffies + msecs_to_jiffies(PKT_EVENT_LIFETIME_MS); |
| 1365 | list_add_tail(&evt->link, &ptp->evt_list); |
| 1366 | |
| 1367 | queue_work(ptp->workwq, &ptp->work); |
Laurence Evans | f321160 | 2013-01-28 14:51:17 +0000 | [diff] [blame] | 1368 | } else if (!ptp->evt_overflow) { |
| 1369 | /* Log a warning message and set the event overflow flag. |
| 1370 | * The message won't be logged again until the event queue |
| 1371 | * becomes empty. |
| 1372 | */ |
| 1373 | netif_err(efx, rx_err, efx->net_dev, "PTP event queue overflow\n"); |
| 1374 | ptp->evt_overflow = true; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1375 | } |
| 1376 | spin_unlock_bh(&ptp->evt_lock); |
| 1377 | } |
| 1378 | |
| 1379 | static void ptp_event_fault(struct efx_nic *efx, struct efx_ptp_data *ptp) |
| 1380 | { |
| 1381 | int code = EFX_QWORD_FIELD(ptp->evt_frags[0], MCDI_EVENT_DATA); |
| 1382 | if (ptp->evt_frag_idx != 1) { |
| 1383 | ptp_event_failure(efx, 1); |
| 1384 | return; |
| 1385 | } |
| 1386 | |
| 1387 | netif_err(efx, hw, efx->net_dev, "PTP error %d\n", code); |
| 1388 | } |
| 1389 | |
| 1390 | static void ptp_event_pps(struct efx_nic *efx, struct efx_ptp_data *ptp) |
| 1391 | { |
| 1392 | if (ptp->nic_ts_enabled) |
| 1393 | queue_work(ptp->pps_workwq, &ptp->pps_work); |
| 1394 | } |
| 1395 | |
| 1396 | void efx_ptp_event(struct efx_nic *efx, efx_qword_t *ev) |
| 1397 | { |
| 1398 | struct efx_ptp_data *ptp = efx->ptp_data; |
| 1399 | int code = EFX_QWORD_FIELD(*ev, MCDI_EVENT_CODE); |
| 1400 | |
| 1401 | if (!ptp->enabled) |
| 1402 | return; |
| 1403 | |
| 1404 | if (ptp->evt_frag_idx == 0) { |
| 1405 | ptp->evt_code = code; |
| 1406 | } else if (ptp->evt_code != code) { |
| 1407 | netif_err(efx, hw, efx->net_dev, |
| 1408 | "PTP out of sequence event %d\n", code); |
| 1409 | ptp->evt_frag_idx = 0; |
| 1410 | } |
| 1411 | |
| 1412 | ptp->evt_frags[ptp->evt_frag_idx++] = *ev; |
| 1413 | if (!MCDI_EVENT_FIELD(*ev, CONT)) { |
| 1414 | /* Process resulting event */ |
| 1415 | switch (code) { |
| 1416 | case MCDI_EVENT_CODE_PTP_RX: |
| 1417 | ptp_event_rx(efx, ptp); |
| 1418 | break; |
| 1419 | case MCDI_EVENT_CODE_PTP_FAULT: |
| 1420 | ptp_event_fault(efx, ptp); |
| 1421 | break; |
| 1422 | case MCDI_EVENT_CODE_PTP_PPS: |
| 1423 | ptp_event_pps(efx, ptp); |
| 1424 | break; |
| 1425 | default: |
| 1426 | netif_err(efx, hw, efx->net_dev, |
| 1427 | "PTP unknown event %d\n", code); |
| 1428 | break; |
| 1429 | } |
| 1430 | ptp->evt_frag_idx = 0; |
| 1431 | } else if (MAX_EVENT_FRAGS == ptp->evt_frag_idx) { |
| 1432 | netif_err(efx, hw, efx->net_dev, |
| 1433 | "PTP too many event fragments\n"); |
| 1434 | ptp->evt_frag_idx = 0; |
| 1435 | } |
| 1436 | } |
| 1437 | |
| 1438 | static int efx_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta) |
| 1439 | { |
| 1440 | struct efx_ptp_data *ptp_data = container_of(ptp, |
| 1441 | struct efx_ptp_data, |
| 1442 | phc_clock_info); |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 1443 | struct efx_nic *efx = ptp_data->efx; |
Ben Hutchings | 59cfc47 | 2012-09-14 17:30:10 +0100 | [diff] [blame] | 1444 | MCDI_DECLARE_BUF(inadj, MC_CMD_PTP_IN_ADJUST_LEN); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1445 | s64 adjustment_ns; |
| 1446 | int rc; |
| 1447 | |
| 1448 | if (delta > MAX_PPB) |
| 1449 | delta = MAX_PPB; |
| 1450 | else if (delta < -MAX_PPB) |
| 1451 | delta = -MAX_PPB; |
| 1452 | |
| 1453 | /* Convert ppb to fixed point ns. */ |
| 1454 | adjustment_ns = (((s64)delta * PPB_SCALE_WORD) >> |
| 1455 | (PPB_EXTRA_BITS + MAX_PPB_BITS)); |
| 1456 | |
| 1457 | MCDI_SET_DWORD(inadj, PTP_IN_OP, MC_CMD_PTP_OP_ADJUST); |
Laurence Evans | c1d828b | 2013-03-06 15:33:17 +0000 | [diff] [blame] | 1458 | MCDI_SET_DWORD(inadj, PTP_IN_PERIPH_ID, 0); |
Ben Hutchings | 338f74d | 2012-10-10 23:20:17 +0100 | [diff] [blame] | 1459 | MCDI_SET_QWORD(inadj, PTP_IN_ADJUST_FREQ, adjustment_ns); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1460 | MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_SECONDS, 0); |
| 1461 | MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_NANOSECONDS, 0); |
| 1462 | rc = efx_mcdi_rpc(efx, MC_CMD_PTP, inadj, sizeof(inadj), |
| 1463 | NULL, 0, NULL); |
| 1464 | if (rc != 0) |
| 1465 | return rc; |
| 1466 | |
Ben Hutchings | cd6fe65 | 2013-12-05 17:24:06 +0000 | [diff] [blame] | 1467 | ptp_data->current_adjfreq = adjustment_ns; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1468 | return 0; |
| 1469 | } |
| 1470 | |
| 1471 | static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta) |
| 1472 | { |
| 1473 | struct efx_ptp_data *ptp_data = container_of(ptp, |
| 1474 | struct efx_ptp_data, |
| 1475 | phc_clock_info); |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 1476 | struct efx_nic *efx = ptp_data->efx; |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1477 | struct timespec delta_ts = ns_to_timespec(delta); |
Ben Hutchings | 59cfc47 | 2012-09-14 17:30:10 +0100 | [diff] [blame] | 1478 | MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_ADJUST_LEN); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1479 | |
| 1480 | MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_ADJUST); |
Laurence Evans | c1d828b | 2013-03-06 15:33:17 +0000 | [diff] [blame] | 1481 | MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0); |
Ben Hutchings | cd6fe65 | 2013-12-05 17:24:06 +0000 | [diff] [blame] | 1482 | MCDI_SET_QWORD(inbuf, PTP_IN_ADJUST_FREQ, ptp_data->current_adjfreq); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1483 | MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_SECONDS, (u32)delta_ts.tv_sec); |
| 1484 | MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_NANOSECONDS, (u32)delta_ts.tv_nsec); |
| 1485 | return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), |
| 1486 | NULL, 0, NULL); |
| 1487 | } |
| 1488 | |
| 1489 | static int efx_phc_gettime(struct ptp_clock_info *ptp, struct timespec *ts) |
| 1490 | { |
| 1491 | struct efx_ptp_data *ptp_data = container_of(ptp, |
| 1492 | struct efx_ptp_data, |
| 1493 | phc_clock_info); |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 1494 | struct efx_nic *efx = ptp_data->efx; |
Ben Hutchings | 59cfc47 | 2012-09-14 17:30:10 +0100 | [diff] [blame] | 1495 | MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_READ_NIC_TIME_LEN); |
| 1496 | MCDI_DECLARE_BUF(outbuf, MC_CMD_PTP_OUT_READ_NIC_TIME_LEN); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1497 | int rc; |
| 1498 | |
| 1499 | MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_READ_NIC_TIME); |
Laurence Evans | c1d828b | 2013-03-06 15:33:17 +0000 | [diff] [blame] | 1500 | MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1501 | |
| 1502 | rc = efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), |
| 1503 | outbuf, sizeof(outbuf), NULL); |
| 1504 | if (rc != 0) |
| 1505 | return rc; |
| 1506 | |
| 1507 | ts->tv_sec = MCDI_DWORD(outbuf, PTP_OUT_READ_NIC_TIME_SECONDS); |
| 1508 | ts->tv_nsec = MCDI_DWORD(outbuf, PTP_OUT_READ_NIC_TIME_NANOSECONDS); |
| 1509 | return 0; |
| 1510 | } |
| 1511 | |
| 1512 | static int efx_phc_settime(struct ptp_clock_info *ptp, |
| 1513 | const struct timespec *e_ts) |
| 1514 | { |
| 1515 | /* Get the current NIC time, efx_phc_gettime. |
| 1516 | * Subtract from the desired time to get the offset |
| 1517 | * call efx_phc_adjtime with the offset |
| 1518 | */ |
| 1519 | int rc; |
| 1520 | struct timespec time_now; |
| 1521 | struct timespec delta; |
| 1522 | |
| 1523 | rc = efx_phc_gettime(ptp, &time_now); |
| 1524 | if (rc != 0) |
| 1525 | return rc; |
| 1526 | |
| 1527 | delta = timespec_sub(*e_ts, time_now); |
| 1528 | |
Julia Lawall | 56567c6 | 2013-01-21 03:02:48 +0000 | [diff] [blame] | 1529 | rc = efx_phc_adjtime(ptp, timespec_to_ns(&delta)); |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1530 | if (rc != 0) |
| 1531 | return rc; |
| 1532 | |
| 1533 | return 0; |
| 1534 | } |
| 1535 | |
| 1536 | static int efx_phc_enable(struct ptp_clock_info *ptp, |
| 1537 | struct ptp_clock_request *request, |
| 1538 | int enable) |
| 1539 | { |
| 1540 | struct efx_ptp_data *ptp_data = container_of(ptp, |
| 1541 | struct efx_ptp_data, |
| 1542 | phc_clock_info); |
| 1543 | if (request->type != PTP_CLK_REQ_PPS) |
| 1544 | return -EOPNOTSUPP; |
| 1545 | |
| 1546 | ptp_data->nic_ts_enabled = !!enable; |
| 1547 | return 0; |
| 1548 | } |
| 1549 | |
| 1550 | static const struct efx_channel_type efx_ptp_channel_type = { |
| 1551 | .handle_no_channel = efx_ptp_handle_no_channel, |
| 1552 | .pre_probe = efx_ptp_probe_channel, |
| 1553 | .post_remove = efx_ptp_remove_channel, |
| 1554 | .get_name = efx_ptp_get_channel_name, |
| 1555 | /* no copy operation; there is no need to reallocate this channel */ |
| 1556 | .receive_skb = efx_ptp_rx, |
| 1557 | .keep_eventq = false, |
| 1558 | }; |
| 1559 | |
Ben Hutchings | ac36baf | 2013-10-15 17:54:56 +0100 | [diff] [blame] | 1560 | void efx_ptp_defer_probe_with_channel(struct efx_nic *efx) |
Stuart Hodgson | 7c236c4 | 2012-09-03 11:09:36 +0100 | [diff] [blame] | 1561 | { |
| 1562 | /* Check whether PTP is implemented on this NIC. The DISABLE |
| 1563 | * operation will succeed if and only if it is implemented. |
| 1564 | */ |
| 1565 | if (efx_ptp_disable(efx) == 0) |
| 1566 | efx->extra_channel_type[EFX_EXTRA_CHANNEL_PTP] = |
| 1567 | &efx_ptp_channel_type; |
| 1568 | } |
Alexandre Rames | 2ea4dc2 | 2013-11-08 10:20:31 +0000 | [diff] [blame] | 1569 | |
| 1570 | void efx_ptp_start_datapath(struct efx_nic *efx) |
| 1571 | { |
| 1572 | if (efx_ptp_restart(efx)) |
| 1573 | netif_err(efx, drv, efx->net_dev, "Failed to restart PTP.\n"); |
| 1574 | } |
| 1575 | |
| 1576 | void efx_ptp_stop_datapath(struct efx_nic *efx) |
| 1577 | { |
| 1578 | efx_ptp_stop(efx); |
| 1579 | } |