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2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b 
 kernel/drivers/net/ethernet/intel/igb/igb_ptp.c
....@@ -53,13 +53,15 @@
5353  *   2^40 * 10^-9 /  60  = 18.3 minutes.
5454  *
5555  * SYSTIM is converted to real time using a timecounter. As
56
- * timecounter_cyc2time() allows old timestamps, the timecounter
57
- * needs to be updated at least once per half of the SYSTIM interval.
58
- * Scheduling of delayed work is not very accurate, so we aim for 8
59
- * minutes to be sure the actual interval is shorter than 9.16 minutes.
56
+ * timecounter_cyc2time() allows old timestamps, the timecounter needs
57
+ * to be updated at least once per half of the SYSTIM interval.
58
+ * Scheduling of delayed work is not very accurate, and also the NIC
59
+ * clock can be adjusted to run up to 6% faster and the system clock
60
+ * up to 10% slower, so we aim for 6 minutes to be sure the actual
61
+ * interval in the NIC time is shorter than 9.16 minutes.
6062  */
6163 
62
-#define IGB_SYSTIM_OVERFLOW_PERIOD	(HZ * 60 * 8)
64
+#define IGB_SYSTIM_OVERFLOW_PERIOD	(HZ * 60 * 6)
6365 #define IGB_PTP_TX_TIMEOUT		(HZ * 15)
6466 #define INCPERIOD_82576			BIT(E1000_TIMINCA_16NS_SHIFT)
6567 #define INCVALUE_82576_MASK		GENMASK(E1000_TIMINCA_16NS_SHIFT - 1, 0)
....@@ -275,17 +277,25 @@
275277 	return 0;
276278 }
277279 
278
-static int igb_ptp_gettime_82576(struct ptp_clock_info *ptp,
279
-				 struct timespec64 *ts)
280
+static int igb_ptp_gettimex_82576(struct ptp_clock_info *ptp,
281
+				  struct timespec64 *ts,
282
+				  struct ptp_system_timestamp *sts)
280283 {
281284 	struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
282285 					       ptp_caps);
286
+	struct e1000_hw *hw = &igb->hw;
283287 	unsigned long flags;
288
+	u32 lo, hi;
284289 	u64 ns;
285290 
286291 	spin_lock_irqsave(&igb->tmreg_lock, flags);
287292 
288
-	ns = timecounter_read(&igb->tc);
293
+	ptp_read_system_prets(sts);
294
+	lo = rd32(E1000_SYSTIML);
295
+	ptp_read_system_postts(sts);
296
+	hi = rd32(E1000_SYSTIMH);
297
+
298
+	ns = timecounter_cyc2time(&igb->tc, ((u64)hi << 32) | lo);
289299 
290300 	spin_unlock_irqrestore(&igb->tmreg_lock, flags);
291301 
....@@ -294,16 +304,50 @@
294304 	return 0;
295305 }
296306 
297
-static int igb_ptp_gettime_i210(struct ptp_clock_info *ptp,
298
-				struct timespec64 *ts)
307
+static int igb_ptp_gettimex_82580(struct ptp_clock_info *ptp,
308
+				  struct timespec64 *ts,
309
+				  struct ptp_system_timestamp *sts)
299310 {
300311 	struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
301312 					       ptp_caps);
313
+	struct e1000_hw *hw = &igb->hw;
314
+	unsigned long flags;
315
+	u32 lo, hi;
316
+	u64 ns;
317
+
318
+	spin_lock_irqsave(&igb->tmreg_lock, flags);
319
+
320
+	ptp_read_system_prets(sts);
321
+	rd32(E1000_SYSTIMR);
322
+	ptp_read_system_postts(sts);
323
+	lo = rd32(E1000_SYSTIML);
324
+	hi = rd32(E1000_SYSTIMH);
325
+
326
+	ns = timecounter_cyc2time(&igb->tc, ((u64)hi << 32) | lo);
327
+
328
+	spin_unlock_irqrestore(&igb->tmreg_lock, flags);
329
+
330
+	*ts = ns_to_timespec64(ns);
331
+
332
+	return 0;
333
+}
334
+
335
+static int igb_ptp_gettimex_i210(struct ptp_clock_info *ptp,
336
+				 struct timespec64 *ts,
337
+				 struct ptp_system_timestamp *sts)
338
+{
339
+	struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
340
+					       ptp_caps);
341
+	struct e1000_hw *hw = &igb->hw;
302342 	unsigned long flags;
303343 
304344 	spin_lock_irqsave(&igb->tmreg_lock, flags);
305345 
306
-	igb_ptp_read_i210(igb, ts);
346
+	ptp_read_system_prets(sts);
347
+	rd32(E1000_SYSTIMR);
348
+	ptp_read_system_postts(sts);
349
+	ts->tv_nsec = rd32(E1000_SYSTIML);
350
+	ts->tv_sec = rd32(E1000_SYSTIMH);
307351 
308352 	spin_unlock_irqrestore(&igb->tmreg_lock, flags);
309353 
....@@ -477,6 +521,19 @@
477521 
478522 	switch (rq->type) {
479523 	case PTP_CLK_REQ_EXTTS:
524
+		/* Reject requests with unsupported flags */
525
+		if (rq->extts.flags & ~(PTP_ENABLE_FEATURE |
526
+					PTP_RISING_EDGE |
527
+					PTP_FALLING_EDGE |
528
+					PTP_STRICT_FLAGS))
529
+			return -EOPNOTSUPP;
530
+
531
+		/* Reject requests failing to enable both edges. */
532
+		if ((rq->extts.flags & PTP_STRICT_FLAGS) &&
533
+		    (rq->extts.flags & PTP_ENABLE_FEATURE) &&
534
+		    (rq->extts.flags & PTP_EXTTS_EDGES) != PTP_EXTTS_EDGES)
535
+			return -EOPNOTSUPP;
536
+
480537 		if (on) {
481538 			pin = ptp_find_pin(igb->ptp_clock, PTP_PF_EXTTS,
482539 					   rq->extts.index);
....@@ -507,6 +564,10 @@
507564 		return 0;
508565 
509566 	case PTP_CLK_REQ_PEROUT:
567
+		/* Reject requests with unsupported flags */
568
+		if (rq->perout.flags)
569
+			return -EOPNOTSUPP;
570
+
510571 		if (on) {
511572 			pin = ptp_find_pin(igb->ptp_clock, PTP_PF_PEROUT,
512573 					   rq->perout.index);
....@@ -656,9 +717,12 @@
656717 	struct igb_adapter *igb =
657718 		container_of(work, struct igb_adapter, ptp_overflow_work.work);
658719 	struct timespec64 ts;
720
+	u64 ns;
659721 
660
-	igb->ptp_caps.gettime64(&igb->ptp_caps, &ts);
722
+	/* Update the timecounter */
723
+	ns = timecounter_read(&igb->tc);
661724 
725
+	ts = ns_to_timespec64(ns);
662726 	pr_debug("igb overflow check at %lld.%09lu\n",
663727 		 (long long) ts.tv_sec, ts.tv_nsec);
664728 
....@@ -792,6 +856,9 @@
792856 	dev_kfree_skb_any(skb);
793857 }
794858 
859
+#define IGB_RET_PTP_DISABLED 1
860
+#define IGB_RET_PTP_INVALID 2
861
+
795862 /**
796863  * igb_ptp_rx_pktstamp - retrieve Rx per packet timestamp
797864  * @q_vector: Pointer to interrupt specific structure
....@@ -800,19 +867,29 @@
800867  *
801868  * This function is meant to retrieve a timestamp from the first buffer of an
802869  * incoming frame.  The value is stored in little endian format starting on
803
- * byte 8.
870
+ * byte 8
871
+ *
872
+ * Returns: 0 if success, nonzero if failure
804873  **/
805
-void igb_ptp_rx_pktstamp(struct igb_q_vector *q_vector, void *va,
806
-			 struct sk_buff *skb)
874
+int igb_ptp_rx_pktstamp(struct igb_q_vector *q_vector, void *va,
875
+			struct sk_buff *skb)
807876 {
808
-	__le64 *regval = (__le64 *)va;
809877 	struct igb_adapter *adapter = q_vector->adapter;
878
+	__le64 *regval = (__le64 *)va;
810879 	int adjust = 0;
880
+
881
+	if (!(adapter->ptp_flags & IGB_PTP_ENABLED))
882
+		return IGB_RET_PTP_DISABLED;
811883 
812884 	/* The timestamp is recorded in little endian format.
813885 	 * DWORD: 0        1        2        3
814886 	 * Field: Reserved Reserved SYSTIML  SYSTIMH
815887 	 */
888
+
889
+	/* check reserved dwords are zero, be/le doesn't matter for zero */
890
+	if (regval[0])
891
+		return IGB_RET_PTP_INVALID;
892
+
816893 	igb_ptp_systim_to_hwtstamp(adapter, skb_hwtstamps(skb),
817894 				   le64_to_cpu(regval[1]));
818895 
....@@ -832,6 +909,8 @@
832909 	}
833910 	skb_hwtstamps(skb)->hwtstamp =
834911 		ktime_sub_ns(skb_hwtstamps(skb)->hwtstamp, adjust);
912
+
913
+	return 0;
835914 }
836915 
837916 /**
....@@ -842,13 +921,15 @@
842921  * This function is meant to retrieve a timestamp from the internal registers
843922  * of the adapter and store it in the skb.
844923  **/
845
-void igb_ptp_rx_rgtstamp(struct igb_q_vector *q_vector,
846
-			 struct sk_buff *skb)
924
+void igb_ptp_rx_rgtstamp(struct igb_q_vector *q_vector, struct sk_buff *skb)
847925 {
848926 	struct igb_adapter *adapter = q_vector->adapter;
849927 	struct e1000_hw *hw = &adapter->hw;
850
-	u64 regval;
851928 	int adjust = 0;
929
+	u64 regval;
930
+
931
+	if (!(adapter->ptp_flags & IGB_PTP_ENABLED))
932
+		return;
852933 
853934 	/* If this bit is set, then the RX registers contain the time stamp. No
854935 	 * other packet will be time stamped until we read these registers, so
....@@ -893,8 +974,8 @@
893974 
894975 /**
895976  * igb_ptp_get_ts_config - get hardware time stamping config
896
- * @netdev:
897
- * @ifreq:
977
+ * @netdev: netdev struct
978
+ * @ifr: interface struct
898979  *
899980  * Get the hwtstamp_config settings to return to the user. Rather than attempt
900981  * to deconstruct the settings from the registers, just return a shadow copy
....@@ -989,7 +1070,7 @@
9891070 			config->rx_filter = HWTSTAMP_FILTER_ALL;
9901071 			break;
9911072 		}
992
-		/* fall through */
1073
+		fallthrough;
9931074 	default:
9941075 		config->rx_filter = HWTSTAMP_FILTER_NONE;
9951076 		return -ERANGE;
....@@ -1077,8 +1158,8 @@
10771158 
10781159 /**
10791160  * igb_ptp_set_ts_config - set hardware time stamping config
1080
- * @netdev:
1081
- * @ifreq:
1161
+ * @netdev: netdev struct
1162
+ * @ifr: interface struct
10821163  *
10831164  **/
10841165 int igb_ptp_set_ts_config(struct net_device *netdev, struct ifreq *ifr)
....@@ -1124,7 +1205,7 @@
11241205 		adapter->ptp_caps.pps = 0;
11251206 		adapter->ptp_caps.adjfreq = igb_ptp_adjfreq_82576;
11261207 		adapter->ptp_caps.adjtime = igb_ptp_adjtime_82576;
1127
-		adapter->ptp_caps.gettime64 = igb_ptp_gettime_82576;
1208
+		adapter->ptp_caps.gettimex64 = igb_ptp_gettimex_82576;
11281209 		adapter->ptp_caps.settime64 = igb_ptp_settime_82576;
11291210 		adapter->ptp_caps.enable = igb_ptp_feature_enable;
11301211 		adapter->cc.read = igb_ptp_read_82576;
....@@ -1143,7 +1224,7 @@
11431224 		adapter->ptp_caps.pps = 0;
11441225 		adapter->ptp_caps.adjfine = igb_ptp_adjfine_82580;
11451226 		adapter->ptp_caps.adjtime = igb_ptp_adjtime_82576;
1146
-		adapter->ptp_caps.gettime64 = igb_ptp_gettime_82576;
1227
+		adapter->ptp_caps.gettimex64 = igb_ptp_gettimex_82580;
11471228 		adapter->ptp_caps.settime64 = igb_ptp_settime_82576;
11481229 		adapter->ptp_caps.enable = igb_ptp_feature_enable;
11491230 		adapter->cc.read = igb_ptp_read_82580;
....@@ -1171,7 +1252,7 @@
11711252 		adapter->ptp_caps.pin_config = adapter->sdp_config;
11721253 		adapter->ptp_caps.adjfine = igb_ptp_adjfine_82580;
11731254 		adapter->ptp_caps.adjtime = igb_ptp_adjtime_i210;
1174
-		adapter->ptp_caps.gettime64 = igb_ptp_gettime_i210;
1255
+		adapter->ptp_caps.gettimex64 = igb_ptp_gettimex_i210;
11751256 		adapter->ptp_caps.settime64 = igb_ptp_settime_i210;
11761257 		adapter->ptp_caps.enable = igb_ptp_feature_enable_i210;
11771258 		adapter->ptp_caps.verify = igb_ptp_verify_pin;
....@@ -1180,18 +1261,6 @@
11801261 		adapter->ptp_clock = NULL;
11811262 		return;
11821263 	}
1183
-
1184
-	spin_lock_init(&adapter->tmreg_lock);
1185
-	INIT_WORK(&adapter->ptp_tx_work, igb_ptp_tx_work);
1186
-
1187
-	if (adapter->ptp_flags & IGB_PTP_OVERFLOW_CHECK)
1188
-		INIT_DELAYED_WORK(&adapter->ptp_overflow_work,
1189
-				  igb_ptp_overflow_check);
1190
-
1191
-	adapter->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
1192
-	adapter->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
1193
-
1194
-	igb_ptp_reset(adapter);
11951264 
11961265 	adapter->ptp_clock = ptp_clock_register(&adapter->ptp_caps,
11971266 						&adapter->pdev->dev);
....@@ -1202,6 +1271,18 @@
12021271 		dev_info(&adapter->pdev->dev, "added PHC on %s\n",
12031272 			 adapter->netdev->name);
12041273 		adapter->ptp_flags |= IGB_PTP_ENABLED;
1274
+
1275
+		spin_lock_init(&adapter->tmreg_lock);
1276
+		INIT_WORK(&adapter->ptp_tx_work, igb_ptp_tx_work);
1277
+
1278
+		if (adapter->ptp_flags & IGB_PTP_OVERFLOW_CHECK)
1279
+			INIT_DELAYED_WORK(&adapter->ptp_overflow_work,
1280
+					  igb_ptp_overflow_check);
1281
+
1282
+		adapter->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
1283
+		adapter->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
1284
+
1285
+		igb_ptp_reset(adapter);
12051286 	}
12061287 }
12071288