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ae06c70b | 1 | // SPDX-License-Identifier: GPL-2.0 |
51dce24b | 2 | /* Copyright(c) 2013 - 2018 Intel Corporation. */ |
beb0dff1 JK |
3 | |
4 | #include "i40e.h" | |
beb0dff1 JK |
5 | #include <linux/ptp_classify.h> |
6 | ||
7 | /* The XL710 timesync is very much like Intel's 82599 design when it comes to | |
8 | * the fundamental clock design. However, the clock operations are much simpler | |
9 | * in the XL710 because the device supports a full 64 bits of nanoseconds. | |
10 | * Because the field is so wide, we can forgo the cycle counter and just | |
11 | * operate with the nanosecond field directly without fear of overflow. | |
12 | * | |
13 | * Much like the 82599, the update period is dependent upon the link speed: | |
14 | * At 40Gb link or no link, the period is 1.6ns. | |
15 | * At 10Gb link, the period is multiplied by 2. (3.2ns) | |
16 | * At 1Gb link, the period is multiplied by 20. (32ns) | |
17 | * 1588 functionality is not supported at 100Mbps. | |
18 | */ | |
830e0dd9 JK |
19 | #define I40E_PTP_40GB_INCVAL 0x0199999999ULL |
20 | #define I40E_PTP_10GB_INCVAL_MULT 2 | |
21 | #define I40E_PTP_1GB_INCVAL_MULT 20 | |
beb0dff1 | 22 | |
41a1d04b JB |
23 | #define I40E_PRTTSYN_CTL1_TSYNTYPE_V1 BIT(I40E_PRTTSYN_CTL1_TSYNTYPE_SHIFT) |
24 | #define I40E_PRTTSYN_CTL1_TSYNTYPE_V2 (2 << \ | |
beb0dff1 | 25 | I40E_PRTTSYN_CTL1_TSYNTYPE_SHIFT) |
beb0dff1 JK |
26 | |
27 | /** | |
28 | * i40e_ptp_read - Read the PHC time from the device | |
29 | * @pf: Board private structure | |
30 | * @ts: timespec structure to hold the current time value | |
9a2d57a7 | 31 | * @sts: structure to hold the system time before and after reading the PHC |
beb0dff1 JK |
32 | * |
33 | * This function reads the PRTTSYN_TIME registers and stores them in a | |
34 | * timespec. However, since the registers are 64 bits of nanoseconds, we must | |
35 | * convert the result to a timespec before we can return. | |
36 | **/ | |
9a2d57a7 ML |
37 | static void i40e_ptp_read(struct i40e_pf *pf, struct timespec64 *ts, |
38 | struct ptp_system_timestamp *sts) | |
beb0dff1 JK |
39 | { |
40 | struct i40e_hw *hw = &pf->hw; | |
41 | u32 hi, lo; | |
42 | u64 ns; | |
43 | ||
44 | /* The timer latches on the lowest register read. */ | |
9a2d57a7 | 45 | ptp_read_system_prets(sts); |
beb0dff1 | 46 | lo = rd32(hw, I40E_PRTTSYN_TIME_L); |
9a2d57a7 | 47 | ptp_read_system_postts(sts); |
beb0dff1 JK |
48 | hi = rd32(hw, I40E_PRTTSYN_TIME_H); |
49 | ||
50 | ns = (((u64)hi) << 32) | lo; | |
51 | ||
6f7a9b8a | 52 | *ts = ns_to_timespec64(ns); |
beb0dff1 JK |
53 | } |
54 | ||
55 | /** | |
56 | * i40e_ptp_write - Write the PHC time to the device | |
57 | * @pf: Board private structure | |
58 | * @ts: timespec structure that holds the new time value | |
59 | * | |
60 | * This function writes the PRTTSYN_TIME registers with the user value. Since | |
61 | * we receive a timespec from the stack, we must convert that timespec into | |
62 | * nanoseconds before programming the registers. | |
63 | **/ | |
6f7a9b8a | 64 | static void i40e_ptp_write(struct i40e_pf *pf, const struct timespec64 *ts) |
beb0dff1 JK |
65 | { |
66 | struct i40e_hw *hw = &pf->hw; | |
6f7a9b8a | 67 | u64 ns = timespec64_to_ns(ts); |
beb0dff1 JK |
68 | |
69 | /* The timer will not update until the high register is written, so | |
70 | * write the low register first. | |
71 | */ | |
72 | wr32(hw, I40E_PRTTSYN_TIME_L, ns & 0xFFFFFFFF); | |
73 | wr32(hw, I40E_PRTTSYN_TIME_H, ns >> 32); | |
74 | } | |
75 | ||
76 | /** | |
77 | * i40e_ptp_convert_to_hwtstamp - Convert device clock to system time | |
78 | * @hwtstamps: Timestamp structure to update | |
79 | * @timestamp: Timestamp from the hardware | |
80 | * | |
81 | * We need to convert the NIC clock value into a hwtstamp which can be used by | |
82 | * the upper level timestamping functions. Since the timestamp is simply a 64- | |
83 | * bit nanosecond value, we can call ns_to_ktime directly to handle this. | |
84 | **/ | |
85 | static void i40e_ptp_convert_to_hwtstamp(struct skb_shared_hwtstamps *hwtstamps, | |
86 | u64 timestamp) | |
87 | { | |
88 | memset(hwtstamps, 0, sizeof(*hwtstamps)); | |
89 | ||
90 | hwtstamps->hwtstamp = ns_to_ktime(timestamp); | |
91 | } | |
92 | ||
93 | /** | |
94 | * i40e_ptp_adjfreq - Adjust the PHC frequency | |
95 | * @ptp: The PTP clock structure | |
96 | * @ppb: Parts per billion adjustment from the base | |
97 | * | |
98 | * Adjust the frequency of the PHC by the indicated parts per billion from the | |
99 | * base frequency. | |
100 | **/ | |
101 | static int i40e_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb) | |
102 | { | |
103 | struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps); | |
104 | struct i40e_hw *hw = &pf->hw; | |
105 | u64 adj, freq, diff; | |
106 | int neg_adj = 0; | |
107 | ||
108 | if (ppb < 0) { | |
109 | neg_adj = 1; | |
110 | ppb = -ppb; | |
111 | } | |
112 | ||
830e0dd9 | 113 | freq = I40E_PTP_40GB_INCVAL; |
beb0dff1 JK |
114 | freq *= ppb; |
115 | diff = div_u64(freq, 1000000000ULL); | |
116 | ||
117 | if (neg_adj) | |
830e0dd9 | 118 | adj = I40E_PTP_40GB_INCVAL - diff; |
beb0dff1 | 119 | else |
830e0dd9 JK |
120 | adj = I40E_PTP_40GB_INCVAL + diff; |
121 | ||
122 | /* At some link speeds, the base incval is so large that directly | |
123 | * multiplying by ppb would result in arithmetic overflow even when | |
124 | * using a u64. Avoid this by instead calculating the new incval | |
125 | * always in terms of the 40GbE clock rate and then multiplying by the | |
126 | * link speed factor afterwards. This does result in slightly lower | |
127 | * precision at lower link speeds, but it is fairly minor. | |
128 | */ | |
129 | smp_mb(); /* Force any pending update before accessing. */ | |
130 | adj *= READ_ONCE(pf->ptp_adj_mult); | |
beb0dff1 JK |
131 | |
132 | wr32(hw, I40E_PRTTSYN_INC_L, adj & 0xFFFFFFFF); | |
133 | wr32(hw, I40E_PRTTSYN_INC_H, adj >> 32); | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | /** | |
139 | * i40e_ptp_adjtime - Adjust the PHC time | |
140 | * @ptp: The PTP clock structure | |
141 | * @delta: Offset in nanoseconds to adjust the PHC time by | |
142 | * | |
4d607043 | 143 | * Adjust the current clock time by a delta specified in nanoseconds. |
beb0dff1 JK |
144 | **/ |
145 | static int i40e_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta) | |
146 | { | |
147 | struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps); | |
b3ccbbce | 148 | struct timespec64 now, then; |
beb0dff1 | 149 | |
b3ccbbce | 150 | then = ns_to_timespec64(delta); |
19551262 | 151 | mutex_lock(&pf->tmreg_lock); |
beb0dff1 | 152 | |
9a2d57a7 | 153 | i40e_ptp_read(pf, &now, NULL); |
b3ccbbce | 154 | now = timespec64_add(now, then); |
6f7a9b8a | 155 | i40e_ptp_write(pf, (const struct timespec64 *)&now); |
beb0dff1 | 156 | |
19551262 | 157 | mutex_unlock(&pf->tmreg_lock); |
beb0dff1 JK |
158 | |
159 | return 0; | |
160 | } | |
161 | ||
162 | /** | |
9a2d57a7 | 163 | * i40e_ptp_gettimex - Get the time of the PHC |
beb0dff1 JK |
164 | * @ptp: The PTP clock structure |
165 | * @ts: timespec structure to hold the current time value | |
9a2d57a7 | 166 | * @sts: structure to hold the system time before and after reading the PHC |
beb0dff1 JK |
167 | * |
168 | * Read the device clock and return the correct value on ns, after converting it | |
169 | * into a timespec struct. | |
170 | **/ | |
9a2d57a7 ML |
171 | static int i40e_ptp_gettimex(struct ptp_clock_info *ptp, struct timespec64 *ts, |
172 | struct ptp_system_timestamp *sts) | |
beb0dff1 JK |
173 | { |
174 | struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps); | |
beb0dff1 | 175 | |
19551262 | 176 | mutex_lock(&pf->tmreg_lock); |
9a2d57a7 | 177 | i40e_ptp_read(pf, ts, sts); |
19551262 | 178 | mutex_unlock(&pf->tmreg_lock); |
beb0dff1 JK |
179 | |
180 | return 0; | |
181 | } | |
182 | ||
183 | /** | |
184 | * i40e_ptp_settime - Set the time of the PHC | |
185 | * @ptp: The PTP clock structure | |
186 | * @ts: timespec structure that holds the new time value | |
187 | * | |
188 | * Set the device clock to the user input value. The conversion from timespec | |
189 | * to ns happens in the write function. | |
190 | **/ | |
191 | static int i40e_ptp_settime(struct ptp_clock_info *ptp, | |
6f7a9b8a | 192 | const struct timespec64 *ts) |
beb0dff1 JK |
193 | { |
194 | struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps); | |
beb0dff1 | 195 | |
19551262 | 196 | mutex_lock(&pf->tmreg_lock); |
beb0dff1 | 197 | i40e_ptp_write(pf, ts); |
19551262 | 198 | mutex_unlock(&pf->tmreg_lock); |
beb0dff1 JK |
199 | |
200 | return 0; | |
201 | } | |
202 | ||
beb0dff1 | 203 | /** |
69d1a70c | 204 | * i40e_ptp_feature_enable - Enable/disable ancillary features of the PHC subsystem |
beb0dff1 JK |
205 | * @ptp: The PTP clock structure |
206 | * @rq: The requested feature to change | |
207 | * @on: Enable/disable flag | |
208 | * | |
209 | * The XL710 does not support any of the ancillary features of the PHC | |
210 | * subsystem, so this function may just return. | |
211 | **/ | |
69d1a70c JK |
212 | static int i40e_ptp_feature_enable(struct ptp_clock_info *ptp, |
213 | struct ptp_clock_request *rq, int on) | |
beb0dff1 JK |
214 | { |
215 | return -EOPNOTSUPP; | |
216 | } | |
217 | ||
12490501 JK |
218 | /** |
219 | * i40e_ptp_update_latch_events - Read I40E_PRTTSYN_STAT_1 and latch events | |
220 | * @pf: the PF data structure | |
221 | * | |
222 | * This function reads I40E_PRTTSYN_STAT_1 and updates the corresponding timers | |
223 | * for noticed latch events. This allows the driver to keep track of the first | |
224 | * time a latch event was noticed which will be used to help clear out Rx | |
225 | * timestamps for packets that got dropped or lost. | |
226 | * | |
227 | * This function will return the current value of I40E_PRTTSYN_STAT_1 and is | |
228 | * expected to be called only while under the ptp_rx_lock. | |
229 | **/ | |
230 | static u32 i40e_ptp_get_rx_events(struct i40e_pf *pf) | |
231 | { | |
232 | struct i40e_hw *hw = &pf->hw; | |
233 | u32 prttsyn_stat, new_latch_events; | |
234 | int i; | |
235 | ||
236 | prttsyn_stat = rd32(hw, I40E_PRTTSYN_STAT_1); | |
237 | new_latch_events = prttsyn_stat & ~pf->latch_event_flags; | |
238 | ||
239 | /* Update the jiffies time for any newly latched timestamp. This | |
240 | * ensures that we store the time that we first discovered a timestamp | |
241 | * was latched by the hardware. The service task will later determine | |
242 | * if we should free the latch and drop that timestamp should too much | |
243 | * time pass. This flow ensures that we only update jiffies for new | |
244 | * events latched since the last time we checked, and not all events | |
245 | * currently latched, so that the service task accounting remains | |
246 | * accurate. | |
247 | */ | |
248 | for (i = 0; i < 4; i++) { | |
249 | if (new_latch_events & BIT(i)) | |
250 | pf->latch_events[i] = jiffies; | |
251 | } | |
252 | ||
253 | /* Finally, we store the current status of the Rx timestamp latches */ | |
254 | pf->latch_event_flags = prttsyn_stat; | |
255 | ||
256 | return prttsyn_stat; | |
257 | } | |
258 | ||
beb0dff1 JK |
259 | /** |
260 | * i40e_ptp_rx_hang - Detect error case when Rx timestamp registers are hung | |
61189556 | 261 | * @pf: The PF private data structure |
beb0dff1 JK |
262 | * |
263 | * This watchdog task is scheduled to detect error case where hardware has | |
264 | * dropped an Rx packet that was timestamped when the ring is full. The | |
265 | * particular error is rare but leaves the device in a state unable to timestamp | |
266 | * any future packets. | |
267 | **/ | |
61189556 | 268 | void i40e_ptp_rx_hang(struct i40e_pf *pf) |
beb0dff1 | 269 | { |
beb0dff1 | 270 | struct i40e_hw *hw = &pf->hw; |
e6e3fc2b | 271 | unsigned int i, cleared = 0; |
beb0dff1 | 272 | |
b535a013 JK |
273 | /* Since we cannot turn off the Rx timestamp logic if the device is |
274 | * configured for Tx timestamping, we check if Rx timestamping is | |
275 | * configured. We don't want to spuriously warn about Rx timestamp | |
276 | * hangs if we don't care about the timestamps. | |
277 | */ | |
278 | if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_rx) | |
beb0dff1 JK |
279 | return; |
280 | ||
12490501 | 281 | spin_lock_bh(&pf->ptp_rx_lock); |
beb0dff1 | 282 | |
12490501 JK |
283 | /* Update current latch times for Rx events */ |
284 | i40e_ptp_get_rx_events(pf); | |
beb0dff1 | 285 | |
12490501 JK |
286 | /* Check all the currently latched Rx events and see whether they have |
287 | * been latched for over a second. It is assumed that any timestamp | |
288 | * should have been cleared within this time, or else it was captured | |
289 | * for a dropped frame that the driver never received. Thus, we will | |
290 | * clear any timestamp that has been latched for over 1 second. | |
291 | */ | |
292 | for (i = 0; i < 4; i++) { | |
293 | if ((pf->latch_event_flags & BIT(i)) && | |
294 | time_is_before_jiffies(pf->latch_events[i] + HZ)) { | |
295 | rd32(hw, I40E_PRTTSYN_RXTIME_H(i)); | |
296 | pf->latch_event_flags &= ~BIT(i); | |
e6e3fc2b | 297 | cleared++; |
12490501 | 298 | } |
beb0dff1 JK |
299 | } |
300 | ||
12490501 | 301 | spin_unlock_bh(&pf->ptp_rx_lock); |
e6e3fc2b JK |
302 | |
303 | /* Log a warning if more than 2 timestamps got dropped in the same | |
304 | * check. We don't want to warn about all drops because it can occur | |
305 | * in normal scenarios such as PTP frames on multicast addresses we | |
306 | * aren't listening to. However, administrator should know if this is | |
307 | * the reason packets aren't receiving timestamps. | |
308 | */ | |
309 | if (cleared > 2) | |
310 | dev_dbg(&pf->pdev->dev, | |
311 | "Dropped %d missed RXTIME timestamp events\n", | |
312 | cleared); | |
313 | ||
314 | /* Finally, update the rx_hwtstamp_cleared counter */ | |
315 | pf->rx_hwtstamp_cleared += cleared; | |
beb0dff1 JK |
316 | } |
317 | ||
0bc0706b JK |
318 | /** |
319 | * i40e_ptp_tx_hang - Detect error case when Tx timestamp register is hung | |
320 | * @pf: The PF private data structure | |
321 | * | |
322 | * This watchdog task is run periodically to make sure that we clear the Tx | |
323 | * timestamp logic if we don't obtain a timestamp in a reasonable amount of | |
324 | * time. It is unexpected in the normal case but if it occurs it results in | |
9c0c3b83 | 325 | * permanently preventing timestamps of future packets. |
0bc0706b JK |
326 | **/ |
327 | void i40e_ptp_tx_hang(struct i40e_pf *pf) | |
328 | { | |
c79756cb JK |
329 | struct sk_buff *skb; |
330 | ||
0bc0706b JK |
331 | if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_tx) |
332 | return; | |
333 | ||
334 | /* Nothing to do if we're not already waiting for a timestamp */ | |
335 | if (!test_bit(__I40E_PTP_TX_IN_PROGRESS, pf->state)) | |
336 | return; | |
337 | ||
338 | /* We already have a handler routine which is run when we are notified | |
339 | * of a Tx timestamp in the hardware. If we don't get an interrupt | |
340 | * within a second it is reasonable to assume that we never will. | |
341 | */ | |
342 | if (time_is_before_jiffies(pf->ptp_tx_start + HZ)) { | |
c79756cb | 343 | skb = pf->ptp_tx_skb; |
0bc0706b JK |
344 | pf->ptp_tx_skb = NULL; |
345 | clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state); | |
c79756cb JK |
346 | |
347 | /* Free the skb after we clear the bitlock */ | |
348 | dev_kfree_skb_any(skb); | |
0bc0706b JK |
349 | pf->tx_hwtstamp_timeouts++; |
350 | } | |
351 | } | |
352 | ||
beb0dff1 JK |
353 | /** |
354 | * i40e_ptp_tx_hwtstamp - Utility function which returns the Tx timestamp | |
355 | * @pf: Board private structure | |
356 | * | |
357 | * Read the value of the Tx timestamp from the registers, convert it into a | |
358 | * value consumable by the stack, and store that result into the shhwtstamps | |
359 | * struct before returning it up the stack. | |
360 | **/ | |
361 | void i40e_ptp_tx_hwtstamp(struct i40e_pf *pf) | |
362 | { | |
363 | struct skb_shared_hwtstamps shhwtstamps; | |
bbc4e7d2 | 364 | struct sk_buff *skb = pf->ptp_tx_skb; |
beb0dff1 JK |
365 | struct i40e_hw *hw = &pf->hw; |
366 | u32 hi, lo; | |
367 | u64 ns; | |
368 | ||
22b4777d JK |
369 | if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_tx) |
370 | return; | |
371 | ||
372 | /* don't attempt to timestamp if we don't have an skb */ | |
373 | if (!pf->ptp_tx_skb) | |
374 | return; | |
375 | ||
beb0dff1 JK |
376 | lo = rd32(hw, I40E_PRTTSYN_TXTIME_L); |
377 | hi = rd32(hw, I40E_PRTTSYN_TXTIME_H); | |
378 | ||
379 | ns = (((u64)hi) << 32) | lo; | |
beb0dff1 | 380 | i40e_ptp_convert_to_hwtstamp(&shhwtstamps, ns); |
bbc4e7d2 JK |
381 | |
382 | /* Clear the bit lock as soon as possible after reading the register, | |
383 | * and prior to notifying the stack via skb_tstamp_tx(). Otherwise | |
384 | * applications might wake up and attempt to request another transmit | |
385 | * timestamp prior to the bit lock being cleared. | |
386 | */ | |
beb0dff1 | 387 | pf->ptp_tx_skb = NULL; |
0da36b97 | 388 | clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state); |
bbc4e7d2 JK |
389 | |
390 | /* Notify the stack and free the skb after we've unlocked */ | |
391 | skb_tstamp_tx(skb, &shhwtstamps); | |
392 | dev_kfree_skb_any(skb); | |
beb0dff1 JK |
393 | } |
394 | ||
395 | /** | |
396 | * i40e_ptp_rx_hwtstamp - Utility function which checks for an Rx timestamp | |
397 | * @pf: Board private structure | |
398 | * @skb: Particular skb to send timestamp with | |
399 | * @index: Index into the receive timestamp registers for the timestamp | |
400 | * | |
401 | * The XL710 receives a notification in the receive descriptor with an offset | |
402 | * into the set of RXTIME registers where the timestamp is for that skb. This | |
403 | * function goes and fetches the receive timestamp from that offset, if a valid | |
404 | * one exists. The RXTIME registers are in ns, so we must convert the result | |
405 | * first. | |
406 | **/ | |
407 | void i40e_ptp_rx_hwtstamp(struct i40e_pf *pf, struct sk_buff *skb, u8 index) | |
408 | { | |
409 | u32 prttsyn_stat, hi, lo; | |
410 | struct i40e_hw *hw; | |
411 | u64 ns; | |
412 | ||
413 | /* Since we cannot turn off the Rx timestamp logic if the device is | |
414 | * doing Tx timestamping, check if Rx timestamping is configured. | |
415 | */ | |
22b4777d | 416 | if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_rx) |
beb0dff1 JK |
417 | return; |
418 | ||
419 | hw = &pf->hw; | |
420 | ||
12490501 JK |
421 | spin_lock_bh(&pf->ptp_rx_lock); |
422 | ||
423 | /* Get current Rx events and update latch times */ | |
424 | prttsyn_stat = i40e_ptp_get_rx_events(pf); | |
beb0dff1 | 425 | |
12490501 JK |
426 | /* TODO: Should we warn about missing Rx timestamp event? */ |
427 | if (!(prttsyn_stat & BIT(index))) { | |
428 | spin_unlock_bh(&pf->ptp_rx_lock); | |
beb0dff1 | 429 | return; |
12490501 JK |
430 | } |
431 | ||
432 | /* Clear the latched event since we're about to read its register */ | |
433 | pf->latch_event_flags &= ~BIT(index); | |
beb0dff1 JK |
434 | |
435 | lo = rd32(hw, I40E_PRTTSYN_RXTIME_L(index)); | |
436 | hi = rd32(hw, I40E_PRTTSYN_RXTIME_H(index)); | |
437 | ||
12490501 JK |
438 | spin_unlock_bh(&pf->ptp_rx_lock); |
439 | ||
beb0dff1 JK |
440 | ns = (((u64)hi) << 32) | lo; |
441 | ||
442 | i40e_ptp_convert_to_hwtstamp(skb_hwtstamps(skb), ns); | |
443 | } | |
444 | ||
445 | /** | |
446 | * i40e_ptp_set_increment - Utility function to update clock increment rate | |
447 | * @pf: Board private structure | |
448 | * | |
449 | * During a link change, the DMA frequency that drives the 1588 logic will | |
450 | * change. In order to keep the PRTTSYN_TIME registers in units of nanoseconds, | |
451 | * we must update the increment value per clock tick. | |
452 | **/ | |
453 | void i40e_ptp_set_increment(struct i40e_pf *pf) | |
454 | { | |
455 | struct i40e_link_status *hw_link_info; | |
456 | struct i40e_hw *hw = &pf->hw; | |
457 | u64 incval; | |
830e0dd9 | 458 | u32 mult; |
beb0dff1 JK |
459 | |
460 | hw_link_info = &hw->phy.link_info; | |
461 | ||
462 | i40e_aq_get_link_info(&pf->hw, true, NULL, NULL); | |
463 | ||
464 | switch (hw_link_info->link_speed) { | |
465 | case I40E_LINK_SPEED_10GB: | |
830e0dd9 | 466 | mult = I40E_PTP_10GB_INCVAL_MULT; |
beb0dff1 JK |
467 | break; |
468 | case I40E_LINK_SPEED_1GB: | |
830e0dd9 | 469 | mult = I40E_PTP_1GB_INCVAL_MULT; |
beb0dff1 JK |
470 | break; |
471 | case I40E_LINK_SPEED_100MB: | |
e684fa34 SN |
472 | { |
473 | static int warn_once; | |
474 | ||
475 | if (!warn_once) { | |
476 | dev_warn(&pf->pdev->dev, | |
477 | "1588 functionality is not supported at 100 Mbps. Stopping the PHC.\n"); | |
478 | warn_once++; | |
479 | } | |
830e0dd9 | 480 | mult = 0; |
beb0dff1 | 481 | break; |
e684fa34 | 482 | } |
beb0dff1 JK |
483 | case I40E_LINK_SPEED_40GB: |
484 | default: | |
830e0dd9 | 485 | mult = 1; |
beb0dff1 JK |
486 | break; |
487 | } | |
488 | ||
830e0dd9 JK |
489 | /* The increment value is calculated by taking the base 40GbE incvalue |
490 | * and multiplying it by a factor based on the link speed. | |
491 | */ | |
492 | incval = I40E_PTP_40GB_INCVAL * mult; | |
493 | ||
beb0dff1 JK |
494 | /* Write the new increment value into the increment register. The |
495 | * hardware will not update the clock until both registers have been | |
496 | * written. | |
497 | */ | |
498 | wr32(hw, I40E_PRTTSYN_INC_L, incval & 0xFFFFFFFF); | |
499 | wr32(hw, I40E_PRTTSYN_INC_H, incval >> 32); | |
500 | ||
501 | /* Update the base adjustement value. */ | |
830e0dd9 | 502 | WRITE_ONCE(pf->ptp_adj_mult, mult); |
beb0dff1 JK |
503 | smp_mb(); /* Force the above update. */ |
504 | } | |
505 | ||
506 | /** | |
507 | * i40e_ptp_get_ts_config - ioctl interface to read the HW timestamping | |
508 | * @pf: Board private structure | |
f5254429 | 509 | * @ifr: ioctl data |
beb0dff1 JK |
510 | * |
511 | * Obtain the current hardware timestamping settigs as requested. To do this, | |
512 | * keep a shadow copy of the timestamp settings rather than attempting to | |
513 | * deconstruct it from the registers. | |
514 | **/ | |
515 | int i40e_ptp_get_ts_config(struct i40e_pf *pf, struct ifreq *ifr) | |
516 | { | |
517 | struct hwtstamp_config *config = &pf->tstamp_config; | |
518 | ||
fe88bda9 JK |
519 | if (!(pf->flags & I40E_FLAG_PTP)) |
520 | return -EOPNOTSUPP; | |
521 | ||
beb0dff1 JK |
522 | return copy_to_user(ifr->ifr_data, config, sizeof(*config)) ? |
523 | -EFAULT : 0; | |
524 | } | |
525 | ||
526 | /** | |
18946455 | 527 | * i40e_ptp_set_timestamp_mode - setup hardware for requested timestamp mode |
beb0dff1 | 528 | * @pf: Board private structure |
18946455 | 529 | * @config: hwtstamp settings requested or saved |
beb0dff1 | 530 | * |
18946455 JK |
531 | * Control hardware registers to enter the specific mode requested by the |
532 | * user. Also used during reset path to ensure that timestamp settings are | |
533 | * maintained. | |
beb0dff1 | 534 | * |
18946455 JK |
535 | * Note: modifies config in place, and may update the requested mode to be |
536 | * more broad if the specific filter is not directly supported. | |
beb0dff1 | 537 | **/ |
18946455 JK |
538 | static int i40e_ptp_set_timestamp_mode(struct i40e_pf *pf, |
539 | struct hwtstamp_config *config) | |
beb0dff1 JK |
540 | { |
541 | struct i40e_hw *hw = &pf->hw; | |
fe88bda9 | 542 | u32 tsyntype, regval; |
beb0dff1 | 543 | |
beb0dff1 JK |
544 | /* Reserved for future extensions. */ |
545 | if (config->flags) | |
546 | return -EINVAL; | |
547 | ||
beb0dff1 JK |
548 | switch (config->tx_type) { |
549 | case HWTSTAMP_TX_OFF: | |
550 | pf->ptp_tx = false; | |
551 | break; | |
552 | case HWTSTAMP_TX_ON: | |
553 | pf->ptp_tx = true; | |
554 | break; | |
555 | default: | |
556 | return -ERANGE; | |
557 | } | |
558 | ||
559 | switch (config->rx_filter) { | |
560 | case HWTSTAMP_FILTER_NONE: | |
561 | pf->ptp_rx = false; | |
4fda14ca JK |
562 | /* We set the type to V1, but do not enable UDP packet |
563 | * recognition. In this way, we should be as close to | |
564 | * disabling PTP Rx timestamps as possible since V1 packets | |
565 | * are always UDP, since L2 packets are a V2 feature. | |
566 | */ | |
567 | tsyntype = I40E_PRTTSYN_CTL1_TSYNTYPE_V1; | |
beb0dff1 JK |
568 | break; |
569 | case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: | |
570 | case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: | |
571 | case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: | |
d36e41dc | 572 | if (!(pf->hw_features & I40E_HW_PTP_L4_CAPABLE)) |
1e28e861 | 573 | return -ERANGE; |
beb0dff1 JK |
574 | pf->ptp_rx = true; |
575 | tsyntype = I40E_PRTTSYN_CTL1_V1MESSTYPE0_MASK | | |
576 | I40E_PRTTSYN_CTL1_TSYNTYPE_V1 | | |
577 | I40E_PRTTSYN_CTL1_UDP_ENA_MASK; | |
578 | config->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT; | |
579 | break; | |
580 | case HWTSTAMP_FILTER_PTP_V2_EVENT: | |
beb0dff1 JK |
581 | case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: |
582 | case HWTSTAMP_FILTER_PTP_V2_SYNC: | |
beb0dff1 JK |
583 | case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: |
584 | case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: | |
beb0dff1 | 585 | case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: |
d36e41dc | 586 | if (!(pf->hw_features & I40E_HW_PTP_L4_CAPABLE)) |
1e28e861 | 587 | return -ERANGE; |
5463fce6 | 588 | fallthrough; |
1e28e861 JK |
589 | case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: |
590 | case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: | |
591 | case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: | |
beb0dff1 JK |
592 | pf->ptp_rx = true; |
593 | tsyntype = I40E_PRTTSYN_CTL1_V2MESSTYPE0_MASK | | |
1e28e861 | 594 | I40E_PRTTSYN_CTL1_TSYNTYPE_V2; |
d36e41dc | 595 | if (pf->hw_features & I40E_HW_PTP_L4_CAPABLE) { |
1e28e861 JK |
596 | tsyntype |= I40E_PRTTSYN_CTL1_UDP_ENA_MASK; |
597 | config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT; | |
598 | } else { | |
599 | config->rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT; | |
600 | } | |
beb0dff1 | 601 | break; |
e3412575 | 602 | case HWTSTAMP_FILTER_NTP_ALL: |
beb0dff1 JK |
603 | case HWTSTAMP_FILTER_ALL: |
604 | default: | |
605 | return -ERANGE; | |
606 | } | |
607 | ||
608 | /* Clear out all 1588-related registers to clear and unlatch them. */ | |
12490501 | 609 | spin_lock_bh(&pf->ptp_rx_lock); |
beb0dff1 JK |
610 | rd32(hw, I40E_PRTTSYN_STAT_0); |
611 | rd32(hw, I40E_PRTTSYN_TXTIME_H); | |
612 | rd32(hw, I40E_PRTTSYN_RXTIME_H(0)); | |
613 | rd32(hw, I40E_PRTTSYN_RXTIME_H(1)); | |
614 | rd32(hw, I40E_PRTTSYN_RXTIME_H(2)); | |
615 | rd32(hw, I40E_PRTTSYN_RXTIME_H(3)); | |
12490501 JK |
616 | pf->latch_event_flags = 0; |
617 | spin_unlock_bh(&pf->ptp_rx_lock); | |
beb0dff1 JK |
618 | |
619 | /* Enable/disable the Tx timestamp interrupt based on user input. */ | |
620 | regval = rd32(hw, I40E_PRTTSYN_CTL0); | |
621 | if (pf->ptp_tx) | |
622 | regval |= I40E_PRTTSYN_CTL0_TXTIME_INT_ENA_MASK; | |
623 | else | |
624 | regval &= ~I40E_PRTTSYN_CTL0_TXTIME_INT_ENA_MASK; | |
625 | wr32(hw, I40E_PRTTSYN_CTL0, regval); | |
626 | ||
627 | regval = rd32(hw, I40E_PFINT_ICR0_ENA); | |
628 | if (pf->ptp_tx) | |
629 | regval |= I40E_PFINT_ICR0_ENA_TIMESYNC_MASK; | |
630 | else | |
631 | regval &= ~I40E_PFINT_ICR0_ENA_TIMESYNC_MASK; | |
632 | wr32(hw, I40E_PFINT_ICR0_ENA, regval); | |
633 | ||
4fda14ca JK |
634 | /* Although there is no simple on/off switch for Rx, we "disable" Rx |
635 | * timestamps by setting to V1 only mode and clear the UDP | |
636 | * recognition. This ought to disable all PTP Rx timestamps as V1 | |
637 | * packets are always over UDP. Note that software is configured to | |
638 | * ignore Rx timestamps via the pf->ptp_rx flag. | |
beb0dff1 | 639 | */ |
4fda14ca JK |
640 | regval = rd32(hw, I40E_PRTTSYN_CTL1); |
641 | /* clear everything but the enable bit */ | |
642 | regval &= I40E_PRTTSYN_CTL1_TSYNENA_MASK; | |
643 | /* now enable bits for desired Rx timestamps */ | |
644 | regval |= tsyntype; | |
645 | wr32(hw, I40E_PRTTSYN_CTL1, regval); | |
beb0dff1 | 646 | |
18946455 JK |
647 | return 0; |
648 | } | |
649 | ||
650 | /** | |
651 | * i40e_ptp_set_ts_config - ioctl interface to control the HW timestamping | |
652 | * @pf: Board private structure | |
f5254429 | 653 | * @ifr: ioctl data |
18946455 JK |
654 | * |
655 | * Respond to the user filter requests and make the appropriate hardware | |
656 | * changes here. The XL710 cannot support splitting of the Tx/Rx timestamping | |
657 | * logic, so keep track in software of whether to indicate these timestamps | |
658 | * or not. | |
659 | * | |
660 | * It is permissible to "upgrade" the user request to a broader filter, as long | |
661 | * as the user receives the timestamps they care about and the user is notified | |
662 | * the filter has been broadened. | |
663 | **/ | |
664 | int i40e_ptp_set_ts_config(struct i40e_pf *pf, struct ifreq *ifr) | |
665 | { | |
d19af2af | 666 | struct hwtstamp_config config; |
18946455 JK |
667 | int err; |
668 | ||
fe88bda9 JK |
669 | if (!(pf->flags & I40E_FLAG_PTP)) |
670 | return -EOPNOTSUPP; | |
671 | ||
d19af2af | 672 | if (copy_from_user(&config, ifr->ifr_data, sizeof(config))) |
18946455 JK |
673 | return -EFAULT; |
674 | ||
d19af2af | 675 | err = i40e_ptp_set_timestamp_mode(pf, &config); |
18946455 JK |
676 | if (err) |
677 | return err; | |
678 | ||
d19af2af JK |
679 | /* save these settings for future reference */ |
680 | pf->tstamp_config = config; | |
681 | ||
682 | return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ? | |
beb0dff1 JK |
683 | -EFAULT : 0; |
684 | } | |
685 | ||
686 | /** | |
fbd5e2df | 687 | * i40e_ptp_create_clock - Create PTP clock device for userspace |
beb0dff1 JK |
688 | * @pf: Board private structure |
689 | * | |
fbd5e2df JK |
690 | * This function creates a new PTP clock device. It only creates one if we |
691 | * don't already have one, so it is safe to call. Will return error if it | |
692 | * can't create one, but success if we already have a device. Should be used | |
693 | * by i40e_ptp_init to create clock initially, and prevent global resets from | |
694 | * creating new clock devices. | |
beb0dff1 | 695 | **/ |
fbd5e2df | 696 | static long i40e_ptp_create_clock(struct i40e_pf *pf) |
beb0dff1 | 697 | { |
fbd5e2df JK |
698 | /* no need to create a clock device if we already have one */ |
699 | if (!IS_ERR_OR_NULL(pf->ptp_clock)) | |
700 | return 0; | |
beb0dff1 | 701 | |
4ff2d854 | 702 | strlcpy(pf->ptp_caps.name, i40e_driver_name, |
7eb74ff8 | 703 | sizeof(pf->ptp_caps.name) - 1); |
beb0dff1 JK |
704 | pf->ptp_caps.owner = THIS_MODULE; |
705 | pf->ptp_caps.max_adj = 999999999; | |
706 | pf->ptp_caps.n_ext_ts = 0; | |
707 | pf->ptp_caps.pps = 0; | |
708 | pf->ptp_caps.adjfreq = i40e_ptp_adjfreq; | |
709 | pf->ptp_caps.adjtime = i40e_ptp_adjtime; | |
9a2d57a7 | 710 | pf->ptp_caps.gettimex64 = i40e_ptp_gettimex; |
6f7a9b8a | 711 | pf->ptp_caps.settime64 = i40e_ptp_settime; |
69d1a70c | 712 | pf->ptp_caps.enable = i40e_ptp_feature_enable; |
beb0dff1 JK |
713 | |
714 | /* Attempt to register the clock before enabling the hardware. */ | |
715 | pf->ptp_clock = ptp_clock_register(&pf->ptp_caps, &pf->pdev->dev); | |
6995b36c | 716 | if (IS_ERR(pf->ptp_clock)) |
fbd5e2df | 717 | return PTR_ERR(pf->ptp_clock); |
fbd5e2df JK |
718 | |
719 | /* clear the hwtstamp settings here during clock create, instead of | |
720 | * during regular init, so that we can maintain settings across a | |
721 | * reset or suspend. | |
722 | */ | |
723 | pf->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE; | |
724 | pf->tstamp_config.tx_type = HWTSTAMP_TX_OFF; | |
725 | ||
bf4bf09b | 726 | /* Set the previous "reset" time to the current Kernel clock time */ |
c4d8d90c | 727 | ktime_get_real_ts64(&pf->ptp_prev_hw_time); |
bf4bf09b JK |
728 | pf->ptp_reset_start = ktime_get(); |
729 | ||
fbd5e2df JK |
730 | return 0; |
731 | } | |
732 | ||
bf4bf09b JK |
733 | /** |
734 | * i40e_ptp_save_hw_time - Save the current PTP time as ptp_prev_hw_time | |
735 | * @pf: Board private structure | |
736 | * | |
737 | * Read the current PTP time and save it into pf->ptp_prev_hw_time. This should | |
738 | * be called at the end of preparing to reset, just before hardware reset | |
739 | * occurs, in order to preserve the PTP time as close as possible across | |
740 | * resets. | |
741 | */ | |
742 | void i40e_ptp_save_hw_time(struct i40e_pf *pf) | |
743 | { | |
744 | /* don't try to access the PTP clock if it's not enabled */ | |
745 | if (!(pf->flags & I40E_FLAG_PTP)) | |
746 | return; | |
747 | ||
748 | i40e_ptp_gettimex(&pf->ptp_caps, &pf->ptp_prev_hw_time, NULL); | |
749 | /* Get a monotonic starting time for this reset */ | |
750 | pf->ptp_reset_start = ktime_get(); | |
751 | } | |
752 | ||
753 | /** | |
754 | * i40e_ptp_restore_hw_time - Restore the ptp_prev_hw_time + delta to PTP regs | |
755 | * @pf: Board private structure | |
756 | * | |
757 | * Restore the PTP hardware clock registers. We previously cached the PTP | |
758 | * hardware time as pf->ptp_prev_hw_time. To be as accurate as possible, | |
759 | * update this value based on the time delta since the time was saved, using | |
760 | * CLOCK_MONOTONIC (via ktime_get()) to calculate the time difference. | |
761 | * | |
762 | * This ensures that the hardware clock is restored to nearly what it should | |
763 | * have been if a reset had not occurred. | |
764 | */ | |
765 | void i40e_ptp_restore_hw_time(struct i40e_pf *pf) | |
766 | { | |
767 | ktime_t delta = ktime_sub(ktime_get(), pf->ptp_reset_start); | |
768 | ||
769 | /* Update the previous HW time with the ktime delta */ | |
770 | timespec64_add_ns(&pf->ptp_prev_hw_time, ktime_to_ns(delta)); | |
771 | ||
772 | /* Restore the hardware clock registers */ | |
773 | i40e_ptp_settime(&pf->ptp_caps, &pf->ptp_prev_hw_time); | |
774 | } | |
775 | ||
fbd5e2df JK |
776 | /** |
777 | * i40e_ptp_init - Initialize the 1588 support after device probe or reset | |
778 | * @pf: Board private structure | |
779 | * | |
780 | * This function sets device up for 1588 support. The first time it is run, it | |
781 | * will create a PHC clock device. It does not create a clock device if one | |
782 | * already exists. It also reconfigures the device after a reset. | |
bf4bf09b JK |
783 | * |
784 | * The first time a clock is created, i40e_ptp_create_clock will set | |
785 | * pf->ptp_prev_hw_time to the current system time. During resets, it is | |
786 | * expected that this timespec will be set to the last known PTP clock time, | |
787 | * in order to preserve the clock time as close as possible across a reset. | |
fbd5e2df JK |
788 | **/ |
789 | void i40e_ptp_init(struct i40e_pf *pf) | |
790 | { | |
791 | struct net_device *netdev = pf->vsi[pf->lan_vsi]->netdev; | |
792 | struct i40e_hw *hw = &pf->hw; | |
fe88bda9 | 793 | u32 pf_id; |
fbd5e2df JK |
794 | long err; |
795 | ||
fe88bda9 JK |
796 | /* Only one PF is assigned to control 1588 logic per port. Do not |
797 | * enable any support for PFs not assigned via PRTTSYN_CTL0.PF_ID | |
798 | */ | |
799 | pf_id = (rd32(hw, I40E_PRTTSYN_CTL0) & I40E_PRTTSYN_CTL0_PF_ID_MASK) >> | |
800 | I40E_PRTTSYN_CTL0_PF_ID_SHIFT; | |
801 | if (hw->pf_id != pf_id) { | |
802 | pf->flags &= ~I40E_FLAG_PTP; | |
803 | dev_info(&pf->pdev->dev, "%s: PTP not supported on %s\n", | |
804 | __func__, | |
805 | netdev->name); | |
806 | return; | |
807 | } | |
808 | ||
19551262 | 809 | mutex_init(&pf->tmreg_lock); |
12490501 | 810 | spin_lock_init(&pf->ptp_rx_lock); |
fbd5e2df JK |
811 | |
812 | /* ensure we have a clock device */ | |
813 | err = i40e_ptp_create_clock(pf); | |
814 | if (err) { | |
beb0dff1 JK |
815 | pf->ptp_clock = NULL; |
816 | dev_err(&pf->pdev->dev, "%s: ptp_clock_register failed\n", | |
817 | __func__); | |
efee95f4 | 818 | } else if (pf->ptp_clock) { |
beb0dff1 JK |
819 | u32 regval; |
820 | ||
6dec1017 SN |
821 | if (pf->hw.debug_mask & I40E_DEBUG_LAN) |
822 | dev_info(&pf->pdev->dev, "PHC enabled\n"); | |
beb0dff1 JK |
823 | pf->flags |= I40E_FLAG_PTP; |
824 | ||
825 | /* Ensure the clocks are running. */ | |
826 | regval = rd32(hw, I40E_PRTTSYN_CTL0); | |
827 | regval |= I40E_PRTTSYN_CTL0_TSYNENA_MASK; | |
828 | wr32(hw, I40E_PRTTSYN_CTL0, regval); | |
829 | regval = rd32(hw, I40E_PRTTSYN_CTL1); | |
830 | regval |= I40E_PRTTSYN_CTL1_TSYNENA_MASK; | |
831 | wr32(hw, I40E_PRTTSYN_CTL1, regval); | |
832 | ||
833 | /* Set the increment value per clock tick. */ | |
834 | i40e_ptp_set_increment(pf); | |
835 | ||
18946455 JK |
836 | /* reset timestamping mode */ |
837 | i40e_ptp_set_timestamp_mode(pf, &pf->tstamp_config); | |
beb0dff1 | 838 | |
bf4bf09b JK |
839 | /* Restore the clock time based on last known value */ |
840 | i40e_ptp_restore_hw_time(pf); | |
beb0dff1 JK |
841 | } |
842 | } | |
843 | ||
844 | /** | |
845 | * i40e_ptp_stop - Disable the driver/hardware support and unregister the PHC | |
846 | * @pf: Board private structure | |
847 | * | |
848 | * This function handles the cleanup work required from the initialization by | |
849 | * clearing out the important information and unregistering the PHC. | |
850 | **/ | |
851 | void i40e_ptp_stop(struct i40e_pf *pf) | |
852 | { | |
853 | pf->flags &= ~I40E_FLAG_PTP; | |
854 | pf->ptp_tx = false; | |
855 | pf->ptp_rx = false; | |
856 | ||
beb0dff1 | 857 | if (pf->ptp_tx_skb) { |
bdf27523 JK |
858 | struct sk_buff *skb = pf->ptp_tx_skb; |
859 | ||
beb0dff1 | 860 | pf->ptp_tx_skb = NULL; |
0da36b97 | 861 | clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state); |
bdf27523 | 862 | dev_kfree_skb_any(skb); |
beb0dff1 JK |
863 | } |
864 | ||
865 | if (pf->ptp_clock) { | |
866 | ptp_clock_unregister(pf->ptp_clock); | |
867 | pf->ptp_clock = NULL; | |
868 | dev_info(&pf->pdev->dev, "%s: removed PHC on %s\n", __func__, | |
869 | pf->vsi[pf->lan_vsi]->netdev->name); | |
870 | } | |
871 | } |