1 /******************************************************************************* 2 3 Intel 10 Gigabit PCI Express Linux driver 4 Copyright(c) 1999 - 2013 Intel Corporation. 5 6 This program is free software; you can redistribute it and/or modify it 7 under the terms and conditions of the GNU General Public License, 8 version 2, as published by the Free Software Foundation. 9 10 This program is distributed in the hope it will be useful, but WITHOUT 11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 more details. 14 15 You should have received a copy of the GNU General Public License along with 16 this program; if not, write to the Free Software Foundation, Inc., 17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 18 19 The full GNU General Public License is included in this distribution in 20 the file called "COPYING". 21 22 Contact Information: 23 Linux NICS <linux.nics@intel.com> 24 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net> 25 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 26 27 *******************************************************************************/ 28 #include "ixgbe.h" 29 #include <linux/export.h> 30 #include <linux/ptp_classify.h> 31 32 /* 33 * The 82599 and the X540 do not have true 64bit nanosecond scale 34 * counter registers. Instead, SYSTIME is defined by a fixed point 35 * system which allows the user to define the scale counter increment 36 * value at every level change of the oscillator driving the SYSTIME 37 * value. For both devices the TIMINCA:IV field defines this 38 * increment. On the X540 device, 31 bits are provided. However on the 39 * 82599 only provides 24 bits. The time unit is determined by the 40 * clock frequency of the oscillator in combination with the TIMINCA 41 * register. When these devices link at 10Gb the oscillator has a 42 * period of 6.4ns. In order to convert the scale counter into 43 * nanoseconds the cyclecounter and timecounter structures are 44 * used. The SYSTIME registers need to be converted to ns values by use 45 * of only a right shift (division by power of 2). The following math 46 * determines the largest incvalue that will fit into the available 47 * bits in the TIMINCA register. 48 * 49 * PeriodWidth: Number of bits to store the clock period 50 * MaxWidth: The maximum width value of the TIMINCA register 51 * Period: The clock period for the oscillator 52 * round(): discard the fractional portion of the calculation 53 * 54 * Period * [ 2 ^ ( MaxWidth - PeriodWidth ) ] 55 * 56 * For the X540, MaxWidth is 31 bits, and the base period is 6.4 ns 57 * For the 82599, MaxWidth is 24 bits, and the base period is 6.4 ns 58 * 59 * The period also changes based on the link speed: 60 * At 10Gb link or no link, the period remains the same. 61 * At 1Gb link, the period is multiplied by 10. (64ns) 62 * At 100Mb link, the period is multiplied by 100. (640ns) 63 * 64 * The calculated value allows us to right shift the SYSTIME register 65 * value in order to quickly convert it into a nanosecond clock, 66 * while allowing for the maximum possible adjustment value. 67 * 68 * These diagrams are only for the 10Gb link period 69 * 70 * SYSTIMEH SYSTIMEL 71 * +--------------+ +--------------+ 72 * X540 | 32 | | 1 | 3 | 28 | 73 * *--------------+ +--------------+ 74 * \________ 36 bits ______/ fract 75 * 76 * +--------------+ +--------------+ 77 * 82599 | 32 | | 8 | 3 | 21 | 78 * *--------------+ +--------------+ 79 * \________ 43 bits ______/ fract 80 * 81 * The 36 bit X540 SYSTIME overflows every 82 * 2^36 * 10^-9 / 60 = 1.14 minutes or 69 seconds 83 * 84 * The 43 bit 82599 SYSTIME overflows every 85 * 2^43 * 10^-9 / 3600 = 2.4 hours 86 */ 87 #define IXGBE_INCVAL_10GB 0x66666666 88 #define IXGBE_INCVAL_1GB 0x40000000 89 #define IXGBE_INCVAL_100 0x50000000 90 91 #define IXGBE_INCVAL_SHIFT_10GB 28 92 #define IXGBE_INCVAL_SHIFT_1GB 24 93 #define IXGBE_INCVAL_SHIFT_100 21 94 95 #define IXGBE_INCVAL_SHIFT_82599 7 96 #define IXGBE_INCPER_SHIFT_82599 24 97 #define IXGBE_MAX_TIMEADJ_VALUE 0x7FFFFFFFFFFFFFFFULL 98 99 #define IXGBE_OVERFLOW_PERIOD (HZ * 30) 100 #define IXGBE_PTP_TX_TIMEOUT (HZ * 15) 101 102 #ifndef NSECS_PER_SEC 103 #define NSECS_PER_SEC 1000000000ULL 104 #endif 105 106 /** 107 * ixgbe_ptp_setup_sdp 108 * @hw: the hardware private structure 109 * 110 * this function enables or disables the clock out feature on SDP0 for 111 * the X540 device. It will create a 1second periodic output that can 112 * be used as the PPS (via an interrupt). 113 * 114 * It calculates when the systime will be on an exact second, and then 115 * aligns the start of the PPS signal to that value. The shift is 116 * necessary because it can change based on the link speed. 117 */ 118 static void ixgbe_ptp_setup_sdp(struct ixgbe_adapter *adapter) 119 { 120 struct ixgbe_hw *hw = &adapter->hw; 121 int shift = adapter->cc.shift; 122 u32 esdp, tsauxc, clktiml, clktimh, trgttiml, trgttimh, rem; 123 u64 ns = 0, clock_edge = 0; 124 125 if ((adapter->flags2 & IXGBE_FLAG2_PTP_PPS_ENABLED) && 126 (hw->mac.type == ixgbe_mac_X540)) { 127 128 /* disable the pin first */ 129 IXGBE_WRITE_REG(hw, IXGBE_TSAUXC, 0x0); 130 IXGBE_WRITE_FLUSH(hw); 131 132 esdp = IXGBE_READ_REG(hw, IXGBE_ESDP); 133 134 /* 135 * enable the SDP0 pin as output, and connected to the 136 * native function for Timesync (ClockOut) 137 */ 138 esdp |= (IXGBE_ESDP_SDP0_DIR | 139 IXGBE_ESDP_SDP0_NATIVE); 140 141 /* 142 * enable the Clock Out feature on SDP0, and allow 143 * interrupts to occur when the pin changes 144 */ 145 tsauxc = (IXGBE_TSAUXC_EN_CLK | 146 IXGBE_TSAUXC_SYNCLK | 147 IXGBE_TSAUXC_SDP0_INT); 148 149 /* clock period (or pulse length) */ 150 clktiml = (u32)(NSECS_PER_SEC << shift); 151 clktimh = (u32)((NSECS_PER_SEC << shift) >> 32); 152 153 /* 154 * Account for the cyclecounter wrap-around value by 155 * using the converted ns value of the current time to 156 * check for when the next aligned second would occur. 157 */ 158 clock_edge |= (u64)IXGBE_READ_REG(hw, IXGBE_SYSTIML); 159 clock_edge |= (u64)IXGBE_READ_REG(hw, IXGBE_SYSTIMH) << 32; 160 ns = timecounter_cyc2time(&adapter->tc, clock_edge); 161 162 div_u64_rem(ns, NSECS_PER_SEC, &rem); 163 clock_edge += ((NSECS_PER_SEC - (u64)rem) << shift); 164 165 /* specify the initial clock start time */ 166 trgttiml = (u32)clock_edge; 167 trgttimh = (u32)(clock_edge >> 32); 168 169 IXGBE_WRITE_REG(hw, IXGBE_CLKTIML, clktiml); 170 IXGBE_WRITE_REG(hw, IXGBE_CLKTIMH, clktimh); 171 IXGBE_WRITE_REG(hw, IXGBE_TRGTTIML0, trgttiml); 172 IXGBE_WRITE_REG(hw, IXGBE_TRGTTIMH0, trgttimh); 173 174 IXGBE_WRITE_REG(hw, IXGBE_ESDP, esdp); 175 IXGBE_WRITE_REG(hw, IXGBE_TSAUXC, tsauxc); 176 } else { 177 IXGBE_WRITE_REG(hw, IXGBE_TSAUXC, 0x0); 178 } 179 180 IXGBE_WRITE_FLUSH(hw); 181 } 182 183 /** 184 * ixgbe_ptp_read - read raw cycle counter (to be used by time counter) 185 * @cc: the cyclecounter structure 186 * 187 * this function reads the cyclecounter registers and is called by the 188 * cyclecounter structure used to construct a ns counter from the 189 * arbitrary fixed point registers 190 */ 191 static cycle_t ixgbe_ptp_read(const struct cyclecounter *cc) 192 { 193 struct ixgbe_adapter *adapter = 194 container_of(cc, struct ixgbe_adapter, cc); 195 struct ixgbe_hw *hw = &adapter->hw; 196 u64 stamp = 0; 197 198 stamp |= (u64)IXGBE_READ_REG(hw, IXGBE_SYSTIML); 199 stamp |= (u64)IXGBE_READ_REG(hw, IXGBE_SYSTIMH) << 32; 200 201 return stamp; 202 } 203 204 /** 205 * ixgbe_ptp_adjfreq 206 * @ptp: the ptp clock structure 207 * @ppb: parts per billion adjustment from base 208 * 209 * adjust the frequency of the ptp cycle counter by the 210 * indicated ppb from the base frequency. 211 */ 212 static int ixgbe_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb) 213 { 214 struct ixgbe_adapter *adapter = 215 container_of(ptp, struct ixgbe_adapter, ptp_caps); 216 struct ixgbe_hw *hw = &adapter->hw; 217 u64 freq; 218 u32 diff, incval; 219 int neg_adj = 0; 220 221 if (ppb < 0) { 222 neg_adj = 1; 223 ppb = -ppb; 224 } 225 226 smp_mb(); 227 incval = ACCESS_ONCE(adapter->base_incval); 228 229 freq = incval; 230 freq *= ppb; 231 diff = div_u64(freq, 1000000000ULL); 232 233 incval = neg_adj ? (incval - diff) : (incval + diff); 234 235 switch (hw->mac.type) { 236 case ixgbe_mac_X540: 237 IXGBE_WRITE_REG(hw, IXGBE_TIMINCA, incval); 238 break; 239 case ixgbe_mac_82599EB: 240 IXGBE_WRITE_REG(hw, IXGBE_TIMINCA, 241 (1 << IXGBE_INCPER_SHIFT_82599) | 242 incval); 243 break; 244 default: 245 break; 246 } 247 248 return 0; 249 } 250 251 /** 252 * ixgbe_ptp_adjtime 253 * @ptp: the ptp clock structure 254 * @delta: offset to adjust the cycle counter by 255 * 256 * adjust the timer by resetting the timecounter structure. 257 */ 258 static int ixgbe_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta) 259 { 260 struct ixgbe_adapter *adapter = 261 container_of(ptp, struct ixgbe_adapter, ptp_caps); 262 unsigned long flags; 263 u64 now; 264 265 spin_lock_irqsave(&adapter->tmreg_lock, flags); 266 267 now = timecounter_read(&adapter->tc); 268 now += delta; 269 270 /* reset the timecounter */ 271 timecounter_init(&adapter->tc, 272 &adapter->cc, 273 now); 274 275 spin_unlock_irqrestore(&adapter->tmreg_lock, flags); 276 277 ixgbe_ptp_setup_sdp(adapter); 278 279 return 0; 280 } 281 282 /** 283 * ixgbe_ptp_gettime 284 * @ptp: the ptp clock structure 285 * @ts: timespec structure to hold the current time value 286 * 287 * read the timecounter and return the correct value on ns, 288 * after converting it into a struct timespec. 289 */ 290 static int ixgbe_ptp_gettime(struct ptp_clock_info *ptp, struct timespec *ts) 291 { 292 struct ixgbe_adapter *adapter = 293 container_of(ptp, struct ixgbe_adapter, ptp_caps); 294 u64 ns; 295 u32 remainder; 296 unsigned long flags; 297 298 spin_lock_irqsave(&adapter->tmreg_lock, flags); 299 ns = timecounter_read(&adapter->tc); 300 spin_unlock_irqrestore(&adapter->tmreg_lock, flags); 301 302 ts->tv_sec = div_u64_rem(ns, 1000000000ULL, &remainder); 303 ts->tv_nsec = remainder; 304 305 return 0; 306 } 307 308 /** 309 * ixgbe_ptp_settime 310 * @ptp: the ptp clock structure 311 * @ts: the timespec containing the new time for the cycle counter 312 * 313 * reset the timecounter to use a new base value instead of the kernel 314 * wall timer value. 315 */ 316 static int ixgbe_ptp_settime(struct ptp_clock_info *ptp, 317 const struct timespec *ts) 318 { 319 struct ixgbe_adapter *adapter = 320 container_of(ptp, struct ixgbe_adapter, ptp_caps); 321 u64 ns; 322 unsigned long flags; 323 324 ns = ts->tv_sec * 1000000000ULL; 325 ns += ts->tv_nsec; 326 327 /* reset the timecounter */ 328 spin_lock_irqsave(&adapter->tmreg_lock, flags); 329 timecounter_init(&adapter->tc, &adapter->cc, ns); 330 spin_unlock_irqrestore(&adapter->tmreg_lock, flags); 331 332 ixgbe_ptp_setup_sdp(adapter); 333 return 0; 334 } 335 336 /** 337 * ixgbe_ptp_enable 338 * @ptp: the ptp clock structure 339 * @rq: the requested feature to change 340 * @on: whether to enable or disable the feature 341 * 342 * enable (or disable) ancillary features of the phc subsystem. 343 * our driver only supports the PPS feature on the X540 344 */ 345 static int ixgbe_ptp_enable(struct ptp_clock_info *ptp, 346 struct ptp_clock_request *rq, int on) 347 { 348 struct ixgbe_adapter *adapter = 349 container_of(ptp, struct ixgbe_adapter, ptp_caps); 350 351 /** 352 * When PPS is enabled, unmask the interrupt for the ClockOut 353 * feature, so that the interrupt handler can send the PPS 354 * event when the clock SDP triggers. Clear mask when PPS is 355 * disabled 356 */ 357 if (rq->type == PTP_CLK_REQ_PPS) { 358 switch (adapter->hw.mac.type) { 359 case ixgbe_mac_X540: 360 if (on) 361 adapter->flags2 |= IXGBE_FLAG2_PTP_PPS_ENABLED; 362 else 363 adapter->flags2 &= ~IXGBE_FLAG2_PTP_PPS_ENABLED; 364 365 ixgbe_ptp_setup_sdp(adapter); 366 return 0; 367 default: 368 break; 369 } 370 } 371 372 return -ENOTSUPP; 373 } 374 375 /** 376 * ixgbe_ptp_check_pps_event 377 * @adapter: the private adapter structure 378 * @eicr: the interrupt cause register value 379 * 380 * This function is called by the interrupt routine when checking for 381 * interrupts. It will check and handle a pps event. 382 */ 383 void ixgbe_ptp_check_pps_event(struct ixgbe_adapter *adapter, u32 eicr) 384 { 385 struct ixgbe_hw *hw = &adapter->hw; 386 struct ptp_clock_event event; 387 388 event.type = PTP_CLOCK_PPS; 389 390 /* this check is necessary in case the interrupt was enabled via some 391 * alternative means (ex. debug_fs). Better to check here than 392 * everywhere that calls this function. 393 */ 394 if (!adapter->ptp_clock) 395 return; 396 397 switch (hw->mac.type) { 398 case ixgbe_mac_X540: 399 ptp_clock_event(adapter->ptp_clock, &event); 400 break; 401 default: 402 break; 403 } 404 } 405 406 /** 407 * ixgbe_ptp_overflow_check - watchdog task to detect SYSTIME overflow 408 * @adapter: private adapter struct 409 * 410 * this watchdog task periodically reads the timecounter 411 * in order to prevent missing when the system time registers wrap 412 * around. This needs to be run approximately twice a minute. 413 */ 414 void ixgbe_ptp_overflow_check(struct ixgbe_adapter *adapter) 415 { 416 bool timeout = time_is_before_jiffies(adapter->last_overflow_check + 417 IXGBE_OVERFLOW_PERIOD); 418 struct timespec ts; 419 420 if (timeout) { 421 ixgbe_ptp_gettime(&adapter->ptp_caps, &ts); 422 adapter->last_overflow_check = jiffies; 423 } 424 } 425 426 /** 427 * ixgbe_ptp_rx_hang - detect error case when Rx timestamp registers latched 428 * @adapter: private network adapter structure 429 * 430 * this watchdog task is scheduled to detect error case where hardware has 431 * dropped an Rx packet that was timestamped when the ring is full. The 432 * particular error is rare but leaves the device in a state unable to timestamp 433 * any future packets. 434 */ 435 void ixgbe_ptp_rx_hang(struct ixgbe_adapter *adapter) 436 { 437 struct ixgbe_hw *hw = &adapter->hw; 438 struct ixgbe_ring *rx_ring; 439 u32 tsyncrxctl = IXGBE_READ_REG(hw, IXGBE_TSYNCRXCTL); 440 unsigned long rx_event; 441 int n; 442 443 /* if we don't have a valid timestamp in the registers, just update the 444 * timeout counter and exit 445 */ 446 if (!(tsyncrxctl & IXGBE_TSYNCRXCTL_VALID)) { 447 adapter->last_rx_ptp_check = jiffies; 448 return; 449 } 450 451 /* determine the most recent watchdog or rx_timestamp event */ 452 rx_event = adapter->last_rx_ptp_check; 453 for (n = 0; n < adapter->num_rx_queues; n++) { 454 rx_ring = adapter->rx_ring[n]; 455 if (time_after(rx_ring->last_rx_timestamp, rx_event)) 456 rx_event = rx_ring->last_rx_timestamp; 457 } 458 459 /* only need to read the high RXSTMP register to clear the lock */ 460 if (time_is_before_jiffies(rx_event + 5*HZ)) { 461 IXGBE_READ_REG(hw, IXGBE_RXSTMPH); 462 adapter->last_rx_ptp_check = jiffies; 463 464 e_warn(drv, "clearing RX Timestamp hang"); 465 } 466 } 467 468 /** 469 * ixgbe_ptp_tx_hwtstamp - utility function which checks for TX time stamp 470 * @adapter: the private adapter struct 471 * 472 * if the timestamp is valid, we convert it into the timecounter ns 473 * value, then store that result into the shhwtstamps structure which 474 * is passed up the network stack 475 */ 476 static void ixgbe_ptp_tx_hwtstamp(struct ixgbe_adapter *adapter) 477 { 478 struct ixgbe_hw *hw = &adapter->hw; 479 struct skb_shared_hwtstamps shhwtstamps; 480 u64 regval = 0, ns; 481 unsigned long flags; 482 483 regval |= (u64)IXGBE_READ_REG(hw, IXGBE_TXSTMPL); 484 regval |= (u64)IXGBE_READ_REG(hw, IXGBE_TXSTMPH) << 32; 485 486 spin_lock_irqsave(&adapter->tmreg_lock, flags); 487 ns = timecounter_cyc2time(&adapter->tc, regval); 488 spin_unlock_irqrestore(&adapter->tmreg_lock, flags); 489 490 memset(&shhwtstamps, 0, sizeof(shhwtstamps)); 491 shhwtstamps.hwtstamp = ns_to_ktime(ns); 492 skb_tstamp_tx(adapter->ptp_tx_skb, &shhwtstamps); 493 494 dev_kfree_skb_any(adapter->ptp_tx_skb); 495 adapter->ptp_tx_skb = NULL; 496 clear_bit_unlock(__IXGBE_PTP_TX_IN_PROGRESS, &adapter->state); 497 } 498 499 /** 500 * ixgbe_ptp_tx_hwtstamp_work 501 * @work: pointer to the work struct 502 * 503 * This work item polls TSYNCTXCTL valid bit to determine when a Tx hardware 504 * timestamp has been taken for the current skb. It is necesary, because the 505 * descriptor's "done" bit does not correlate with the timestamp event. 506 */ 507 static void ixgbe_ptp_tx_hwtstamp_work(struct work_struct *work) 508 { 509 struct ixgbe_adapter *adapter = container_of(work, struct ixgbe_adapter, 510 ptp_tx_work); 511 struct ixgbe_hw *hw = &adapter->hw; 512 bool timeout = time_is_before_jiffies(adapter->ptp_tx_start + 513 IXGBE_PTP_TX_TIMEOUT); 514 u32 tsynctxctl; 515 516 if (timeout) { 517 dev_kfree_skb_any(adapter->ptp_tx_skb); 518 adapter->ptp_tx_skb = NULL; 519 clear_bit_unlock(__IXGBE_PTP_TX_IN_PROGRESS, &adapter->state); 520 e_warn(drv, "clearing Tx Timestamp hang"); 521 return; 522 } 523 524 tsynctxctl = IXGBE_READ_REG(hw, IXGBE_TSYNCTXCTL); 525 if (tsynctxctl & IXGBE_TSYNCTXCTL_VALID) 526 ixgbe_ptp_tx_hwtstamp(adapter); 527 else 528 /* reschedule to keep checking if it's not available yet */ 529 schedule_work(&adapter->ptp_tx_work); 530 } 531 532 /** 533 * __ixgbe_ptp_rx_hwtstamp - utility function which checks for RX time stamp 534 * @q_vector: structure containing interrupt and ring information 535 * @skb: particular skb to send timestamp with 536 * 537 * if the timestamp is valid, we convert it into the timecounter ns 538 * value, then store that result into the shhwtstamps structure which 539 * is passed up the network stack 540 */ 541 void __ixgbe_ptp_rx_hwtstamp(struct ixgbe_q_vector *q_vector, 542 struct sk_buff *skb) 543 { 544 struct ixgbe_adapter *adapter; 545 struct ixgbe_hw *hw; 546 struct skb_shared_hwtstamps *shhwtstamps; 547 u64 regval = 0, ns; 548 u32 tsyncrxctl; 549 unsigned long flags; 550 551 /* we cannot process timestamps on a ring without a q_vector */ 552 if (!q_vector || !q_vector->adapter) 553 return; 554 555 adapter = q_vector->adapter; 556 hw = &adapter->hw; 557 558 /* 559 * Read the tsyncrxctl register afterwards in order to prevent taking an 560 * I/O hit on every packet. 561 */ 562 tsyncrxctl = IXGBE_READ_REG(hw, IXGBE_TSYNCRXCTL); 563 if (!(tsyncrxctl & IXGBE_TSYNCRXCTL_VALID)) 564 return; 565 566 regval |= (u64)IXGBE_READ_REG(hw, IXGBE_RXSTMPL); 567 regval |= (u64)IXGBE_READ_REG(hw, IXGBE_RXSTMPH) << 32; 568 569 570 spin_lock_irqsave(&adapter->tmreg_lock, flags); 571 ns = timecounter_cyc2time(&adapter->tc, regval); 572 spin_unlock_irqrestore(&adapter->tmreg_lock, flags); 573 574 shhwtstamps = skb_hwtstamps(skb); 575 shhwtstamps->hwtstamp = ns_to_ktime(ns); 576 } 577 578 int ixgbe_ptp_get_ts_config(struct ixgbe_adapter *adapter, struct ifreq *ifr) 579 { 580 struct hwtstamp_config *config = &adapter->tstamp_config; 581 582 return copy_to_user(ifr->ifr_data, config, 583 sizeof(*config)) ? -EFAULT : 0; 584 } 585 586 /** 587 * ixgbe_ptp_set_ts_config - control hardware time stamping 588 * @adapter: pointer to adapter struct 589 * @ifreq: ioctl data 590 * 591 * Outgoing time stamping can be enabled and disabled. Play nice and 592 * disable it when requested, although it shouldn't cause any overhead 593 * when no packet needs it. At most one packet in the queue may be 594 * marked for time stamping, otherwise it would be impossible to tell 595 * for sure to which packet the hardware time stamp belongs. 596 * 597 * Incoming time stamping has to be configured via the hardware 598 * filters. Not all combinations are supported, in particular event 599 * type has to be specified. Matching the kind of event packet is 600 * not supported, with the exception of "all V2 events regardless of 601 * level 2 or 4". 602 * 603 * Since hardware always timestamps Path delay packets when timestamping V2 604 * packets, regardless of the type specified in the register, only use V2 605 * Event mode. This more accurately tells the user what the hardware is going 606 * to do anyways. 607 */ 608 int ixgbe_ptp_set_ts_config(struct ixgbe_adapter *adapter, struct ifreq *ifr) 609 { 610 struct ixgbe_hw *hw = &adapter->hw; 611 struct hwtstamp_config config; 612 u32 tsync_tx_ctl = IXGBE_TSYNCTXCTL_ENABLED; 613 u32 tsync_rx_ctl = IXGBE_TSYNCRXCTL_ENABLED; 614 u32 tsync_rx_mtrl = PTP_EV_PORT << 16; 615 bool is_l2 = false; 616 u32 regval; 617 618 if (copy_from_user(&config, ifr->ifr_data, sizeof(config))) 619 return -EFAULT; 620 621 /* reserved for future extensions */ 622 if (config.flags) 623 return -EINVAL; 624 625 switch (config.tx_type) { 626 case HWTSTAMP_TX_OFF: 627 tsync_tx_ctl = 0; 628 case HWTSTAMP_TX_ON: 629 break; 630 default: 631 return -ERANGE; 632 } 633 634 switch (config.rx_filter) { 635 case HWTSTAMP_FILTER_NONE: 636 tsync_rx_ctl = 0; 637 tsync_rx_mtrl = 0; 638 break; 639 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: 640 tsync_rx_ctl |= IXGBE_TSYNCRXCTL_TYPE_L4_V1; 641 tsync_rx_mtrl |= IXGBE_RXMTRL_V1_SYNC_MSG; 642 break; 643 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: 644 tsync_rx_ctl |= IXGBE_TSYNCRXCTL_TYPE_L4_V1; 645 tsync_rx_mtrl |= IXGBE_RXMTRL_V1_DELAY_REQ_MSG; 646 break; 647 case HWTSTAMP_FILTER_PTP_V2_EVENT: 648 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: 649 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: 650 case HWTSTAMP_FILTER_PTP_V2_SYNC: 651 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: 652 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: 653 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: 654 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: 655 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: 656 tsync_rx_ctl |= IXGBE_TSYNCRXCTL_TYPE_EVENT_V2; 657 is_l2 = true; 658 config.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT; 659 break; 660 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: 661 case HWTSTAMP_FILTER_ALL: 662 default: 663 /* 664 * register RXMTRL must be set in order to do V1 packets, 665 * therefore it is not possible to time stamp both V1 Sync and 666 * Delay_Req messages and hardware does not support 667 * timestamping all packets => return error 668 */ 669 config.rx_filter = HWTSTAMP_FILTER_NONE; 670 return -ERANGE; 671 } 672 673 if (hw->mac.type == ixgbe_mac_82598EB) { 674 if (tsync_rx_ctl | tsync_tx_ctl) 675 return -ERANGE; 676 return 0; 677 } 678 679 /* define ethertype filter for timestamping L2 packets */ 680 if (is_l2) 681 IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_1588), 682 (IXGBE_ETQF_FILTER_EN | /* enable filter */ 683 IXGBE_ETQF_1588 | /* enable timestamping */ 684 ETH_P_1588)); /* 1588 eth protocol type */ 685 else 686 IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_1588), 0); 687 688 689 /* enable/disable TX */ 690 regval = IXGBE_READ_REG(hw, IXGBE_TSYNCTXCTL); 691 regval &= ~IXGBE_TSYNCTXCTL_ENABLED; 692 regval |= tsync_tx_ctl; 693 IXGBE_WRITE_REG(hw, IXGBE_TSYNCTXCTL, regval); 694 695 /* enable/disable RX */ 696 regval = IXGBE_READ_REG(hw, IXGBE_TSYNCRXCTL); 697 regval &= ~(IXGBE_TSYNCRXCTL_ENABLED | IXGBE_TSYNCRXCTL_TYPE_MASK); 698 regval |= tsync_rx_ctl; 699 IXGBE_WRITE_REG(hw, IXGBE_TSYNCRXCTL, regval); 700 701 /* define which PTP packets are time stamped */ 702 IXGBE_WRITE_REG(hw, IXGBE_RXMTRL, tsync_rx_mtrl); 703 704 IXGBE_WRITE_FLUSH(hw); 705 706 /* clear TX/RX time stamp registers, just to be sure */ 707 regval = IXGBE_READ_REG(hw, IXGBE_TXSTMPH); 708 regval = IXGBE_READ_REG(hw, IXGBE_RXSTMPH); 709 710 /* save these settings for future reference */ 711 memcpy(&adapter->tstamp_config, &config, 712 sizeof(adapter->tstamp_config)); 713 714 return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ? 715 -EFAULT : 0; 716 } 717 718 /** 719 * ixgbe_ptp_start_cyclecounter - create the cycle counter from hw 720 * @adapter: pointer to the adapter structure 721 * 722 * This function should be called to set the proper values for the TIMINCA 723 * register and tell the cyclecounter structure what the tick rate of SYSTIME 724 * is. It does not directly modify SYSTIME registers or the timecounter 725 * structure. It should be called whenever a new TIMINCA value is necessary, 726 * such as during initialization or when the link speed changes. 727 */ 728 void ixgbe_ptp_start_cyclecounter(struct ixgbe_adapter *adapter) 729 { 730 struct ixgbe_hw *hw = &adapter->hw; 731 u32 incval = 0; 732 u32 shift = 0; 733 unsigned long flags; 734 735 /** 736 * Scale the NIC cycle counter by a large factor so that 737 * relatively small corrections to the frequency can be added 738 * or subtracted. The drawbacks of a large factor include 739 * (a) the clock register overflows more quickly, (b) the cycle 740 * counter structure must be able to convert the systime value 741 * to nanoseconds using only a multiplier and a right-shift, 742 * and (c) the value must fit within the timinca register space 743 * => math based on internal DMA clock rate and available bits 744 * 745 * Note that when there is no link, internal DMA clock is same as when 746 * link speed is 10Gb. Set the registers correctly even when link is 747 * down to preserve the clock setting 748 */ 749 switch (adapter->link_speed) { 750 case IXGBE_LINK_SPEED_100_FULL: 751 incval = IXGBE_INCVAL_100; 752 shift = IXGBE_INCVAL_SHIFT_100; 753 break; 754 case IXGBE_LINK_SPEED_1GB_FULL: 755 incval = IXGBE_INCVAL_1GB; 756 shift = IXGBE_INCVAL_SHIFT_1GB; 757 break; 758 case IXGBE_LINK_SPEED_10GB_FULL: 759 default: 760 incval = IXGBE_INCVAL_10GB; 761 shift = IXGBE_INCVAL_SHIFT_10GB; 762 break; 763 } 764 765 /** 766 * Modify the calculated values to fit within the correct 767 * number of bits specified by the hardware. The 82599 doesn't 768 * have the same space as the X540, so bitshift the calculated 769 * values to fit. 770 */ 771 switch (hw->mac.type) { 772 case ixgbe_mac_X540: 773 IXGBE_WRITE_REG(hw, IXGBE_TIMINCA, incval); 774 break; 775 case ixgbe_mac_82599EB: 776 incval >>= IXGBE_INCVAL_SHIFT_82599; 777 shift -= IXGBE_INCVAL_SHIFT_82599; 778 IXGBE_WRITE_REG(hw, IXGBE_TIMINCA, 779 (1 << IXGBE_INCPER_SHIFT_82599) | 780 incval); 781 break; 782 default: 783 /* other devices aren't supported */ 784 return; 785 } 786 787 /* update the base incval used to calculate frequency adjustment */ 788 ACCESS_ONCE(adapter->base_incval) = incval; 789 smp_mb(); 790 791 /* need lock to prevent incorrect read while modifying cyclecounter */ 792 spin_lock_irqsave(&adapter->tmreg_lock, flags); 793 794 memset(&adapter->cc, 0, sizeof(adapter->cc)); 795 adapter->cc.read = ixgbe_ptp_read; 796 adapter->cc.mask = CLOCKSOURCE_MASK(64); 797 adapter->cc.shift = shift; 798 adapter->cc.mult = 1; 799 800 spin_unlock_irqrestore(&adapter->tmreg_lock, flags); 801 } 802 803 /** 804 * ixgbe_ptp_reset 805 * @adapter: the ixgbe private board structure 806 * 807 * When the MAC resets, all timesync features are reset. This function should be 808 * called to re-enable the PTP clock structure. It will re-init the timecounter 809 * structure based on the kernel time as well as setup the cycle counter data. 810 */ 811 void ixgbe_ptp_reset(struct ixgbe_adapter *adapter) 812 { 813 struct ixgbe_hw *hw = &adapter->hw; 814 unsigned long flags; 815 816 /* set SYSTIME registers to 0 just in case */ 817 IXGBE_WRITE_REG(hw, IXGBE_SYSTIML, 0x00000000); 818 IXGBE_WRITE_REG(hw, IXGBE_SYSTIMH, 0x00000000); 819 IXGBE_WRITE_FLUSH(hw); 820 821 /* Reset the saved tstamp_config */ 822 memset(&adapter->tstamp_config, 0, sizeof(adapter->tstamp_config)); 823 824 ixgbe_ptp_start_cyclecounter(adapter); 825 826 spin_lock_irqsave(&adapter->tmreg_lock, flags); 827 828 /* reset the ns time counter */ 829 timecounter_init(&adapter->tc, &adapter->cc, 830 ktime_to_ns(ktime_get_real())); 831 832 spin_unlock_irqrestore(&adapter->tmreg_lock, flags); 833 834 /* 835 * Now that the shift has been calculated and the systime 836 * registers reset, (re-)enable the Clock out feature 837 */ 838 ixgbe_ptp_setup_sdp(adapter); 839 } 840 841 /** 842 * ixgbe_ptp_init 843 * @adapter: the ixgbe private adapter structure 844 * 845 * This function performs the required steps for enabling ptp 846 * support. If ptp support has already been loaded it simply calls the 847 * cyclecounter init routine and exits. 848 */ 849 void ixgbe_ptp_init(struct ixgbe_adapter *adapter) 850 { 851 struct net_device *netdev = adapter->netdev; 852 853 switch (adapter->hw.mac.type) { 854 case ixgbe_mac_X540: 855 snprintf(adapter->ptp_caps.name, 856 sizeof(adapter->ptp_caps.name), 857 "%s", netdev->name); 858 adapter->ptp_caps.owner = THIS_MODULE; 859 adapter->ptp_caps.max_adj = 250000000; 860 adapter->ptp_caps.n_alarm = 0; 861 adapter->ptp_caps.n_ext_ts = 0; 862 adapter->ptp_caps.n_per_out = 0; 863 adapter->ptp_caps.pps = 1; 864 adapter->ptp_caps.adjfreq = ixgbe_ptp_adjfreq; 865 adapter->ptp_caps.adjtime = ixgbe_ptp_adjtime; 866 adapter->ptp_caps.gettime = ixgbe_ptp_gettime; 867 adapter->ptp_caps.settime = ixgbe_ptp_settime; 868 adapter->ptp_caps.enable = ixgbe_ptp_enable; 869 break; 870 case ixgbe_mac_82599EB: 871 snprintf(adapter->ptp_caps.name, 872 sizeof(adapter->ptp_caps.name), 873 "%s", netdev->name); 874 adapter->ptp_caps.owner = THIS_MODULE; 875 adapter->ptp_caps.max_adj = 250000000; 876 adapter->ptp_caps.n_alarm = 0; 877 adapter->ptp_caps.n_ext_ts = 0; 878 adapter->ptp_caps.n_per_out = 0; 879 adapter->ptp_caps.pps = 0; 880 adapter->ptp_caps.adjfreq = ixgbe_ptp_adjfreq; 881 adapter->ptp_caps.adjtime = ixgbe_ptp_adjtime; 882 adapter->ptp_caps.gettime = ixgbe_ptp_gettime; 883 adapter->ptp_caps.settime = ixgbe_ptp_settime; 884 adapter->ptp_caps.enable = ixgbe_ptp_enable; 885 break; 886 default: 887 adapter->ptp_clock = NULL; 888 return; 889 } 890 891 spin_lock_init(&adapter->tmreg_lock); 892 INIT_WORK(&adapter->ptp_tx_work, ixgbe_ptp_tx_hwtstamp_work); 893 894 adapter->ptp_clock = ptp_clock_register(&adapter->ptp_caps, 895 &adapter->pdev->dev); 896 if (IS_ERR(adapter->ptp_clock)) { 897 adapter->ptp_clock = NULL; 898 e_dev_err("ptp_clock_register failed\n"); 899 } else 900 e_dev_info("registered PHC device on %s\n", netdev->name); 901 902 ixgbe_ptp_reset(adapter); 903 904 /* enter the IXGBE_PTP_RUNNING state */ 905 set_bit(__IXGBE_PTP_RUNNING, &adapter->state); 906 907 return; 908 } 909 910 /** 911 * ixgbe_ptp_stop - disable ptp device and stop the overflow check 912 * @adapter: pointer to adapter struct 913 * 914 * this function stops the ptp support, and cancels the delayed work. 915 */ 916 void ixgbe_ptp_stop(struct ixgbe_adapter *adapter) 917 { 918 /* Leave the IXGBE_PTP_RUNNING state. */ 919 if (!test_and_clear_bit(__IXGBE_PTP_RUNNING, &adapter->state)) 920 return; 921 922 /* stop the PPS signal */ 923 adapter->flags2 &= ~IXGBE_FLAG2_PTP_PPS_ENABLED; 924 ixgbe_ptp_setup_sdp(adapter); 925 926 cancel_work_sync(&adapter->ptp_tx_work); 927 if (adapter->ptp_tx_skb) { 928 dev_kfree_skb_any(adapter->ptp_tx_skb); 929 adapter->ptp_tx_skb = NULL; 930 clear_bit_unlock(__IXGBE_PTP_TX_IN_PROGRESS, &adapter->state); 931 } 932 933 if (adapter->ptp_clock) { 934 ptp_clock_unregister(adapter->ptp_clock); 935 adapter->ptp_clock = NULL; 936 e_dev_info("removed PHC on %s\n", 937 adapter->netdev->name); 938 } 939 } 940