ethtool: add timestamping related string sets

Add three string sets related to timestamping information:

ETH_SS_SOF_TIMESTAMPING: SOF_TIMESTAMPING_* flags
ETH_SS_TS_TX_TYPES: timestamping Tx types
ETH_SS_TS_RX_FILTERS: timestamping Rx filters

These will be used for TIMESTAMP_GET request.

v2: avoid compiler warning ("enumeration value not handled in switch")
in net_hwtstamp_validate()

v3: omit dash in Tx type names ("one-step-*" -> "onestep-*"), suggested by
Richard Cochran

Signed-off-by: Michal Kubecek <[e-mail]>
Acked-by: Richard Cochran <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/uapi/linux/ethtool.h

···
  * @ETH_SS_LINK_MODES: link mode names
  * @ETH_SS_MSG_CLASSES: debug message class names
  * @ETH_SS_WOL_MODES: wake-on-lan modes
+ * @ETH_SS_SOF_TIMESTAMPING: SOF_TIMESTAMPING_* flags
+ * @ETH_SS_TS_TX_TYPES: timestamping Tx types
+ * @ETH_SS_TS_RX_FILTERS: timestamping Rx filters
  */
 enum ethtool_stringset {
 	ETH_SS_TEST		= 0,
···
 	ETH_SS_LINK_MODES,
 	ETH_SS_MSG_CLASSES,
 	ETH_SS_WOL_MODES,
+	ETH_SS_SOF_TIMESTAMPING,
+	ETH_SS_TS_TX_TYPES,
+	ETH_SS_TS_RX_FILTERS,
 
 	/* add new constants above here */
 	ETH_SS_COUNT

include/uapi/linux/net_tstamp.h

···
 	 * receive a time stamp via the socket error queue.
 	 */
 	HWTSTAMP_TX_ONESTEP_P2P,
+
+	/* add new constants above here */
+	__HWTSTAMP_TX_CNT
 };
 
 /* possible values for hwtstamp_config->rx_filter */
···
 
 	/* NTP, UDP, all versions and packet modes */
 	HWTSTAMP_FILTER_NTP_ALL,
+
+	/* add new constants above here */
+	__HWTSTAMP_FILTER_CNT
 };
 
 /* SCM_TIMESTAMPING_PKTINFO control message */

net/core/dev_ioctl.c

···
 	case HWTSTAMP_TX_ONESTEP_P2P:
 		tx_type_valid = 1;
 		break;
+	case __HWTSTAMP_TX_CNT:
+		/* not a real value */
+		break;
 	}
 
 	switch (rx_filter) {
···
 	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
 	case HWTSTAMP_FILTER_NTP_ALL:
 		rx_filter_valid = 1;
+		break;
+	case __HWTSTAMP_FILTER_CNT:
+		/* not a real value */
 		break;
 	}
 

net/ethtool/common.c

···
 // SPDX-License-Identifier: GPL-2.0-only
 
+#include <linux/net_tstamp.h>
+
 #include "common.h"
 
 const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] = {
···
 	[const_ilog2(WAKE_FILTER)]	= "filter",
 };
 static_assert(ARRAY_SIZE(wol_mode_names) == WOL_MODE_COUNT);
+
+const char sof_timestamping_names[][ETH_GSTRING_LEN] = {
+	[const_ilog2(SOF_TIMESTAMPING_TX_HARDWARE)]  = "hardware-transmit",
+	[const_ilog2(SOF_TIMESTAMPING_TX_SOFTWARE)]  = "software-transmit",
+	[const_ilog2(SOF_TIMESTAMPING_RX_HARDWARE)]  = "hardware-receive",
+	[const_ilog2(SOF_TIMESTAMPING_RX_SOFTWARE)]  = "software-receive",
+	[const_ilog2(SOF_TIMESTAMPING_SOFTWARE)]     = "software-system-clock",
+	[const_ilog2(SOF_TIMESTAMPING_SYS_HARDWARE)] = "hardware-legacy-clock",
+	[const_ilog2(SOF_TIMESTAMPING_RAW_HARDWARE)] = "hardware-raw-clock",
+	[const_ilog2(SOF_TIMESTAMPING_OPT_ID)]       = "option-id",
+	[const_ilog2(SOF_TIMESTAMPING_TX_SCHED)]     = "sched-transmit",
+	[const_ilog2(SOF_TIMESTAMPING_TX_ACK)]       = "ack-transmit",
+	[const_ilog2(SOF_TIMESTAMPING_OPT_CMSG)]     = "option-cmsg",
+	[const_ilog2(SOF_TIMESTAMPING_OPT_TSONLY)]   = "option-tsonly",
+	[const_ilog2(SOF_TIMESTAMPING_OPT_STATS)]    = "option-stats",
+	[const_ilog2(SOF_TIMESTAMPING_OPT_PKTINFO)]  = "option-pktinfo",
+	[const_ilog2(SOF_TIMESTAMPING_OPT_TX_SWHW)]  = "option-tx-swhw",
+};
+static_assert(ARRAY_SIZE(sof_timestamping_names) == __SOF_TIMESTAMPING_CNT);
+
+const char ts_tx_type_names[][ETH_GSTRING_LEN] = {
+	[HWTSTAMP_TX_OFF]		= "off",
+	[HWTSTAMP_TX_ON]		= "on",
+	[HWTSTAMP_TX_ONESTEP_SYNC]	= "onestep-sync",
+	[HWTSTAMP_TX_ONESTEP_P2P]	= "onestep-p2p",
+};
+static_assert(ARRAY_SIZE(ts_tx_type_names) == __HWTSTAMP_TX_CNT);
+
+const char ts_rx_filter_names[][ETH_GSTRING_LEN] = {
+	[HWTSTAMP_FILTER_NONE]			= "none",
+	[HWTSTAMP_FILTER_ALL]			= "all",
+	[HWTSTAMP_FILTER_SOME]			= "some",
+	[HWTSTAMP_FILTER_PTP_V1_L4_EVENT]	= "ptpv1-l4-event",
+	[HWTSTAMP_FILTER_PTP_V1_L4_SYNC]	= "ptpv1-l4-sync",
+	[HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ]	= "ptpv1-l4-delay-req",
+	[HWTSTAMP_FILTER_PTP_V2_L4_EVENT]	= "ptpv2-l4-event",
+	[HWTSTAMP_FILTER_PTP_V2_L4_SYNC]	= "ptpv2-l4-sync",
+	[HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ]	= "ptpv2-l4-delay-req",
+	[HWTSTAMP_FILTER_PTP_V2_L2_EVENT]	= "ptpv2-l2-event",
+	[HWTSTAMP_FILTER_PTP_V2_L2_SYNC]	= "ptpv2-l2-sync",
+	[HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ]	= "ptpv2-l2-delay-req",
+	[HWTSTAMP_FILTER_PTP_V2_EVENT]		= "ptpv2-event",
+	[HWTSTAMP_FILTER_PTP_V2_SYNC]		= "ptpv2-sync",
+	[HWTSTAMP_FILTER_PTP_V2_DELAY_REQ]	= "ptpv2-delay-req",
+	[HWTSTAMP_FILTER_NTP_ALL]		= "ntp-all",
+};
+static_assert(ARRAY_SIZE(ts_rx_filter_names) == __HWTSTAMP_FILTER_CNT);
 
 /* return false if legacy contained non-0 deprecated fields
  * maxtxpkt/maxrxpkt. rest of ksettings always updated

net/ethtool/common.h

···
 #define ETHTOOL_LINK_MODE(speed, type, duplex) \
 	ETHTOOL_LINK_MODE_ ## speed ## base ## type ## _ ## duplex ## _BIT
 
+#define __SOF_TIMESTAMPING_CNT (const_ilog2(SOF_TIMESTAMPING_LAST) + 1)
+
 extern const char
 netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN];
 extern const char
···
 extern const char link_mode_names[][ETH_GSTRING_LEN];
 extern const char netif_msg_class_names[][ETH_GSTRING_LEN];
 extern const char wol_mode_names[][ETH_GSTRING_LEN];
+extern const char sof_timestamping_names[][ETH_GSTRING_LEN];
+extern const char ts_tx_type_names[][ETH_GSTRING_LEN];
+extern const char ts_rx_filter_names[][ETH_GSTRING_LEN];
 
 int __ethtool_get_link(struct net_device *dev);
 

net/ethtool/strset.c

···
 		.count		= WOL_MODE_COUNT,
 		.strings	= wol_mode_names,
 	},
+	[ETH_SS_SOF_TIMESTAMPING] = {
+		.per_dev	= false,
+		.count		= __SOF_TIMESTAMPING_CNT,
+		.strings	= sof_timestamping_names,
+	},
+	[ETH_SS_TS_TX_TYPES] = {
+		.per_dev	= false,
+		.count		= __HWTSTAMP_TX_CNT,
+		.strings	= ts_tx_type_names,
+	},
+	[ETH_SS_TS_RX_FILTERS] = {
+		.per_dev	= false,
+		.count		= __HWTSTAMP_FILTER_CNT,
+		.strings	= ts_rx_filter_names,
+	},
 };
 
 struct strset_req_info {