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Date:   Mon, 18 Feb 2019 19:22:29 +0100 (CET)
From:   Michal Kubecek <mkubecek@...e.cz>
To:     netdev@...r.kernel.org
Cc:     David Miller <davem@...emloft.net>, Andrew Lunn <andrew@...n.ch>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jiri Pirko <jiri@...nulli.us>, linux-kernel@...r.kernel.org
Subject: [RFC PATCH net-next v3 13/21] ethtool: provide timestamping
 information in GET_INFO request

Add timestamping information as provided by ETHTOOL_GET_TS_INFO ioctl
command in GET_INFO reply if ETH_INFO_IM_TSINFO flag is set in the request.

Add constants for counts of HWTSTAMP_TX_* and HWTSTAM_FILTER_* constants
and provide symbolic names for timestamping related values so that they can
be retrieved in GET_STRSET and GET_INFO requests.

Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
---
 Documentation/networking/ethtool-netlink.txt |  10 +-
 include/uapi/linux/ethtool.h                 |   6 +
 include/uapi/linux/ethtool_netlink.h         |  14 +-
 include/uapi/linux/net_tstamp.h              |  13 ++
 net/ethtool/common.c                         |  24 ++++
 net/ethtool/common.h                         |   2 +
 net/ethtool/info.c                           | 138 +++++++++++++++++++
 net/ethtool/ioctl.c                          |  20 +--
 net/ethtool/netlink.h                        |   9 ++
 net/ethtool/strset.c                         |  18 +++
 10 files changed, 234 insertions(+), 20 deletions(-)

diff --git a/Documentation/networking/ethtool-netlink.txt b/Documentation/networking/ethtool-netlink.txt
index 1e615e111262..c6c7475340e2 100644
--- a/Documentation/networking/ethtool-netlink.txt
+++ b/Documentation/networking/ethtool-netlink.txt
@@ -242,6 +242,11 @@ Kernel response contents:
     ETHA_INFO_PERMADDR		(nested)
         ETHA_PERMADDR_ADDRESS		(binary)	permanent HW address
         ETHA_PERMADDR_TYPE		(u16)		dev->type
+    ETHA_INFO_TSINFO		(nested)	timestamping information
+        ETHA_TSINFO_TIMESTAMPING	(bitset)	supported flags
+        ETHA_TSINFO_PHC_INDEX		(u32)		associated PHC
+        ETHA_TSINFO_TX_TYPES		(bitset)	Tx types
+        ETHA_TSINFO_RX_FILTERS		(bitset)	Rx filters
 
 The meaning of DRVINFO attributes follows the corresponding fields of
 ETHTOOL_GDRVINFO response. Second part with various counts and sizes is
@@ -253,6 +258,9 @@ There is no separate attribute for permanent address length as the length can
 be determined from attribute length (nla_len()). ETHA_PERMADDR_TYPE provides
 net_device::type value to give a hint about what kind of address device has.
 
+ETHA_TSINFO_PHC_INDEX can be unsigned as there is no need for special value;
+if no PHC is associated, the attribute is not present.
+
 GET_INFO requests allow dumps.
 
 
@@ -328,7 +336,7 @@ ETHTOOL_SCHANNELS		n/a
 ETHTOOL_SET_DUMP		n/a
 ETHTOOL_GET_DUMP_FLAG		n/a
 ETHTOOL_GET_DUMP_DATA		n/a
-ETHTOOL_GET_TS_INFO		n/a
+ETHTOOL_GET_TS_INFO		ETHNL_CMD_GET_INFO
 ETHTOOL_GMODULEINFO		n/a
 ETHTOOL_GMODULEEEPROM		n/a
 ETHTOOL_GEEE			n/a
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 9ea278961d80..1b58637d3a4d 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -563,6 +563,9 @@ struct ethtool_pauseparam {
  * @ETH_SS_RSS_HASH_FUNCS: RSS hush function names
  * @ETH_SS_PHY_STATS: Statistic names, for use with %ETHTOOL_GPHYSTATS
  * @ETH_SS_PHY_TUNABLES: PHY tunable names
+ * @ETH_SS_TSTAMP_SOF: timestamping flag names
+ * @ETH_SS_TSTAMP_TX_TYPE: timestamping Tx type names
+ * @ETH_SS_TSTAMP_RX_FILTER: timestamping Rx filter names
  */
 enum ethtool_stringset {
 	ETH_SS_TEST		= 0,
@@ -574,6 +577,9 @@ enum ethtool_stringset {
 	ETH_SS_TUNABLES,
 	ETH_SS_PHY_STATS,
 	ETH_SS_PHY_TUNABLES,
+	ETH_SS_TSTAMP_SOF,
+	ETH_SS_TSTAMP_TX_TYPE,
+	ETH_SS_TSTAMP_RX_FILTER,
 
 	ETH_SS_COUNT
 };
diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index fb756b6a8592..8ab2b7454e81 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -154,8 +154,9 @@ enum {
 
 #define ETH_INFO_IM_DRVINFO			0x01
 #define ETH_INFO_IM_PERMADDR			0x02
+#define ETH_INFO_IM_TSINFO			0x04
 
-#define ETH_INFO_IM_ALL				0x03
+#define ETH_INFO_IM_ALL				0x07
 
 enum {
 	ETHA_DRVINFO_UNSPEC,
@@ -177,6 +178,17 @@ enum {
 	ETHA_PERMADDR_MAX = (__ETHA_PERMADDR_CNT - 1)
 };
 
+enum {
+	ETHA_TSINFO_UNSPEC,
+	ETHA_TSINFO_TIMESTAMPING,		/* bitset */
+	ETHA_TSINFO_PHC_INDEX,			/* u32 */
+	ETHA_TSINFO_TX_TYPES,			/* bitset */
+	ETHA_TSINFO_RX_FILTERS,			/* bitset */
+
+	__ETHA_TSINFO_CNT,
+	ETHA_TSINFO_MAX = (__ETHA_TSINFO_CNT - 1)
+};
+
 /* generic netlink info */
 #define ETHTOOL_GENL_NAME "ethtool"
 #define ETHTOOL_GENL_VERSION 1
diff --git a/include/uapi/linux/net_tstamp.h b/include/uapi/linux/net_tstamp.h
index e5b39721c6e4..e5b0472c4416 100644
--- a/include/uapi/linux/net_tstamp.h
+++ b/include/uapi/linux/net_tstamp.h
@@ -30,6 +30,9 @@ enum {
 	SOF_TIMESTAMPING_OPT_STATS = (1<<12),
 	SOF_TIMESTAMPING_OPT_PKTINFO = (1<<13),
 	SOF_TIMESTAMPING_OPT_TX_SWHW = (1<<14),
+	/* when adding a flag, please update so_timestamping_labels array
+	 * in net/ethtool/info.c
+	 */
 
 	SOF_TIMESTAMPING_LAST = SOF_TIMESTAMPING_OPT_TX_SWHW,
 	SOF_TIMESTAMPING_MASK = (SOF_TIMESTAMPING_LAST - 1) |
@@ -90,6 +93,11 @@ enum hwtstamp_tx_types {
 	 * queue.
 	 */
 	HWTSTAMP_TX_ONESTEP_SYNC,
+	/* when adding a value, please update tstamp_tx_type_labels array
+	 * in net/ethtool/info.c
+	 */
+
+	HWTSTAMP_TX_LAST = HWTSTAMP_TX_ONESTEP_SYNC
 };
 
 /* possible values for hwtstamp_config->rx_filter */
@@ -132,6 +140,11 @@ enum hwtstamp_rx_filters {
 
 	/* NTP, UDP, all versions and packet modes */
 	HWTSTAMP_FILTER_NTP_ALL,
+	/* when adding a value, please update tstamp_rx_filter_labels array
+	 * in net/ethtool/info.c
+	 */
+
+	HWTSTAMP_FILTER_LAST = HWTSTAMP_FILTER_NTP_ALL
 };
 
 /* SCM_TIMESTAMPING_PKTINFO control message */
diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index e0bd7c6c5874..4616816861cc 100644
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
 
 #include <linux/rtnetlink.h>
+#include <linux/phy.h>
+#include <linux/net_tstamp.h>
 #include <net/devlink.h>
 #include "common.h"
 
@@ -135,3 +137,25 @@ int __ethtool_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 
 	return 0;
 }
+
+int __ethtool_get_ts_info(struct net_device *dev, struct ethtool_ts_info *info)
+{
+	const struct ethtool_ops *ops = dev->ethtool_ops;
+	struct phy_device *phydev = dev->phydev;
+	int err = 0;
+
+	memset(info, 0, sizeof(*info));
+	info->cmd = ETHTOOL_GET_TS_INFO;
+
+	if (phydev && phydev->drv && phydev->drv->ts_info) {
+		err = phydev->drv->ts_info(phydev, info);
+	} else if (ops->get_ts_info) {
+		err = ops->get_ts_info(dev, info);
+	} else {
+		info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
+					SOF_TIMESTAMPING_SOFTWARE;
+		info->phc_index = -1;
+	}
+
+	return err;
+}
diff --git a/net/ethtool/common.h b/net/ethtool/common.h
index e87e58b3a274..02cbee79da35 100644
--- a/net/ethtool/common.h
+++ b/net/ethtool/common.h
@@ -16,4 +16,6 @@ extern const char
 phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN];
 
 int __ethtool_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info);
+int __ethtool_get_ts_info(struct net_device *dev, struct ethtool_ts_info *info);
+
 #endif /* _ETHTOOL_COMMON_H */
diff --git a/net/ethtool/info.c b/net/ethtool/info.c
index 05dbd87ebc41..838257db1d31 100644
--- a/net/ethtool/info.c
+++ b/net/ethtool/info.c
@@ -1,15 +1,61 @@
 // SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
 
+#include <linux/net_tstamp.h>
+
 #include "netlink.h"
 #include "common.h"
 #include "bitset.h"
 
+const char *const so_timestamping_labels[] = {
+	"hardware-transmit",		/* SOF_TIMESTAMPING_TX_HARDWARE */
+	"software-transmit",		/* SOF_TIMESTAMPING_TX_SOFTWARE */
+	"hardware-receive",		/* SOF_TIMESTAMPING_RX_HARDWARE */
+	"software-receive",		/* SOF_TIMESTAMPING_RX_SOFTWARE */
+	"software-system-clock",	/* SOF_TIMESTAMPING_SOFTWARE */
+	"hardware-legacy-clock",	/* SOF_TIMESTAMPING_SYS_HARDWARE */
+	"hardware-raw-clock",		/* SOF_TIMESTAMPING_RAW_HARDWARE */
+	"option-id",			/* SOF_TIMESTAMPING_OPT_ID */
+	"sched-transmit",		/* SOF_TIMESTAMPING_TX_SCHED */
+	"ack-transmit",			/* SOF_TIMESTAMPING_TX_ACK */
+	"option-cmsg",			/* SOF_TIMESTAMPING_OPT_CMSG */
+	"option-tsonly",		/* SOF_TIMESTAMPING_OPT_TSONLY */
+	"option-stats",			/* SOF_TIMESTAMPING_OPT_STATS */
+	"option-pktinfo",		/* SOF_TIMESTAMPING_OPT_PKTINFO */
+	"option-tx-swhw",		/* SOF_TIMESTAMPING_OPT_TX_SWHW */
+};
+
+const char *const tstamp_tx_type_labels[] = {
+	[HWTSTAMP_TX_OFF]		= "off",
+	[HWTSTAMP_TX_ON]		= "on",
+	[HWTSTAMP_TX_ONESTEP_SYNC]	= "one-step-sync",
+};
+
+const char *const tstamp_rx_filter_labels[] = {
+	[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",
+};
+
 struct info_data {
 	struct common_req_info		reqinfo_base;
 
 	/* everything below here will be reset for each device in dumps */
 	struct common_reply_data	repdata_base;
 	struct ethtool_drvinfo		drvinfo;
+	struct ethtool_ts_info		tsinfo;
 };
 
 static const struct nla_policy get_info_policy[ETHA_INFO_MAX + 1] = {
@@ -19,6 +65,7 @@ static const struct nla_policy get_info_policy[ETHA_INFO_MAX + 1] = {
 	[ETHA_INFO_COMPACT]		= { .type = NLA_FLAG },
 	[ETHA_INFO_DRVINFO]		= { .type = NLA_REJECT },
 	[ETHA_INFO_PERMADDR]		= { .type = NLA_REJECT },
+	[ETHA_INFO_TSINFO]		= { .type = NLA_REJECT },
 };
 
 static int parse_info(struct common_req_info *req_info, struct sk_buff *skb,
@@ -67,6 +114,11 @@ static int prepare_info(struct common_req_info *req_info,
 		if (ret < 0)
 			req_mask &= ~ETH_INFO_IM_DRVINFO;
 	}
+	if (req_mask & ETH_INFO_IM_TSINFO) {
+		ret = __ethtool_get_ts_info(dev, &data->tsinfo);
+		if (ret < 0)
+			req_mask &= ~ETH_INFO_IM_TSINFO;
+	}
 	ethnl_after_ops(dev);
 
 	data->repdata_base.info_mask = req_mask;
@@ -97,6 +149,42 @@ static int permaddr_size(const struct net_device *dev)
 	return nla_total_size(len);
 }
 
+static int tsinfo_size(const struct ethtool_ts_info *tsinfo, bool compact)
+{
+	const unsigned int flags = compact ? ETHNL_BITSET_COMPACT : 0;
+	int len = 0;
+	int ret;
+
+	/* if any of these exceeds 32, we need a different interface to talk to
+	 * NIC drivers anyway
+	 */
+	BUILD_BUG_ON(__SOF_TIMESTAMPING_COUNT > 32);
+	BUILD_BUG_ON(__HWTSTAMP_TX_COUNT > 32);
+	BUILD_BUG_ON(__HWTSTAMP_FILTER_COUNT > 32);
+
+	ret = ethnl_bitset32_size(__SOF_TIMESTAMPING_COUNT,
+				  &tsinfo->so_timestamping, NULL,
+				  so_timestamping_labels, flags);
+	if (ret < 0)
+		return ret;
+	len += ret;
+	ret = ethnl_bitset32_size(__HWTSTAMP_TX_COUNT,
+				  &tsinfo->tx_types, NULL,
+				  tstamp_tx_type_labels, flags);
+	if (ret < 0)
+		return ret;
+	len += ret;
+	ret = ethnl_bitset32_size(__HWTSTAMP_FILTER_COUNT,
+				  &tsinfo->rx_filters, NULL,
+				  tstamp_rx_filter_labels, flags);
+	if (ret < 0)
+		return ret;
+	len += ret;
+	len += nla_total_size(sizeof(u32));
+
+	return nla_total_size(len);
+}
+
 static int info_size(const struct common_req_info *req_info)
 {
 	const struct info_data *data =
@@ -110,6 +198,13 @@ static int info_size(const struct common_req_info *req_info)
 		len += drvinfo_size(&data->drvinfo);
 	if (info_mask & ETH_INFO_IM_PERMADDR)
 		len += permaddr_size(dev);
+	if (info_mask & ETH_INFO_IM_TSINFO) {
+		int ret = tsinfo_size(&data->tsinfo, req_info->compact);
+
+		if (ret < 0)
+			return ret;
+		len += ret;
+	}
 
 	return len;
 }
@@ -158,6 +253,44 @@ static int fill_permaddr(struct sk_buff *skb, const struct net_device *dev)
 	return ret;
 }
 
+static int fill_tsinfo(struct sk_buff *skb,
+		       const struct ethtool_ts_info *tsinfo, bool compact)
+{
+	const unsigned int flags = compact ? ETHNL_BITSET_COMPACT : 0;
+	struct nlattr *nest = ethnl_nest_start(skb, ETHA_INFO_TSINFO);
+	int ret;
+
+	if (!nest)
+		return -EMSGSIZE;
+	ret = ethnl_put_bitset32(skb, ETHA_TSINFO_TIMESTAMPING,
+				 __SOF_TIMESTAMPING_COUNT,
+				 &tsinfo->so_timestamping, NULL,
+				 so_timestamping_labels, flags);
+	if (ret < 0)
+		goto err;
+	ret = -EMSGSIZE;
+	if (tsinfo->phc_index >= 0 &&
+	    nla_put_u32(skb, ETHA_TSINFO_PHC_INDEX, tsinfo->phc_index))
+		goto err;
+
+	ret = ethnl_put_bitset32(skb, ETHA_TSINFO_TX_TYPES, __HWTSTAMP_TX_COUNT,
+				 &tsinfo->tx_types, NULL, tstamp_tx_type_labels,
+				 flags);
+	if (ret < 0)
+		goto err;
+	ret = ethnl_put_bitset32(skb, ETHA_TSINFO_RX_FILTERS,
+				 __HWTSTAMP_FILTER_COUNT, &tsinfo->rx_filters,
+				 NULL, tstamp_rx_filter_labels, flags);
+	if (ret < 0)
+		goto err;
+
+	nla_nest_end(skb, nest);
+	return 0;
+err:
+	nla_nest_cancel(skb, nest);
+	return ret;
+}
+
 static int fill_info(struct sk_buff *skb,
 		     const struct common_req_info *req_info)
 {
@@ -176,6 +309,11 @@ static int fill_info(struct sk_buff *skb,
 		if (ret < 0)
 			return ret;
 	}
+	if (info_mask & ETH_INFO_IM_TSINFO) {
+		ret = fill_tsinfo(skb, &data->tsinfo, req_info->compact);
+		if (ret < 0)
+			return ret;
+	}
 
 	return 0;
 }
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index c883239001a4..0837849156d3 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -2034,28 +2034,12 @@ static int ethtool_get_dump_data(struct net_device *dev,
 
 static int ethtool_get_ts_info(struct net_device *dev, void __user *useraddr)
 {
-	int err = 0;
+	int err;
 	struct ethtool_ts_info info;
-	const struct ethtool_ops *ops = dev->ethtool_ops;
-	struct phy_device *phydev = dev->phydev;
-
-	memset(&info, 0, sizeof(info));
-	info.cmd = ETHTOOL_GET_TS_INFO;
-
-	if (phydev && phydev->drv && phydev->drv->ts_info) {
-		err = phydev->drv->ts_info(phydev, &info);
-	} else if (ops->get_ts_info) {
-		err = ops->get_ts_info(dev, &info);
-	} else {
-		info.so_timestamping =
-			SOF_TIMESTAMPING_RX_SOFTWARE |
-			SOF_TIMESTAMPING_SOFTWARE;
-		info.phc_index = -1;
-	}
 
+	err = __ethtool_get_ts_info(dev, &info);
 	if (err)
 		return err;
-
 	if (copy_to_user(useraddr, &info, sizeof(info)))
 		err = -EFAULT;
 
diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index 7141ec71a6d3..82a4c1f398d8 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -7,14 +7,23 @@
 #include <linux/netdevice.h>
 #include <net/genetlink.h>
 #include <net/sock.h>
+#include <linux/net_tstamp.h>
 
 #define ETHNL_SET_ERRMSG(info, msg) \
 	do { if (info) GENL_SET_ERR_MSG(info, msg); } while (0)
 
+#define __SOF_TIMESTAMPING_COUNT (const_ilog2(SOF_TIMESTAMPING_LAST) + 1)
+#define __HWTSTAMP_TX_COUNT (HWTSTAMP_TX_LAST + 1)
+#define __HWTSTAMP_FILTER_COUNT (HWTSTAMP_FILTER_LAST + 1)
+
 extern u32 ethnl_bcast_seq;
 
 extern struct genl_family ethtool_genl_family;
 
+extern const char *const so_timestamping_labels[];
+extern const char *const tstamp_tx_type_labels[];
+extern const char *const tstamp_rx_filter_labels[];
+
 struct net_device *ethnl_dev_get(struct genl_info *info, struct nlattr *nest);
 int ethnl_fill_dev(struct sk_buff *msg, struct net_device *dev, u16 attrtype);
 
diff --git a/net/ethtool/strset.c b/net/ethtool/strset.c
index a7d0ec2865fb..5c74498d9c72 100644
--- a/net/ethtool/strset.c
+++ b/net/ethtool/strset.c
@@ -67,6 +67,24 @@ static const struct strset_info info_template[] = {
 		.count		= ARRAY_SIZE(phy_tunable_strings),
 		.data		= { .legacy = phy_tunable_strings },
 	},
+	[ETH_SS_TSTAMP_SOF] = {
+		.type		= ETH_SS_TYPE_SIMPLE,
+		.per_dev	= false,
+		.count		= __SOF_TIMESTAMPING_COUNT,
+		.data		= { .simple = so_timestamping_labels },
+	},
+	[ETH_SS_TSTAMP_TX_TYPE] = {
+		.type		= ETH_SS_TYPE_SIMPLE,
+		.per_dev	= false,
+		.count		= __HWTSTAMP_TX_COUNT,
+		.data		= { .simple = tstamp_tx_type_labels },
+	},
+	[ETH_SS_TSTAMP_RX_FILTER] = {
+		.type		= ETH_SS_TYPE_SIMPLE,
+		.per_dev	= false,
+		.count		= __HWTSTAMP_FILTER_COUNT,
+		.data		= { .simple = tstamp_rx_filter_labels },
+	},
 };
 
 struct strset_data {
-- 
2.20.1

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