ethtool: add a new command for getting PHC virtual clocks

Add an interface for getting PHC (PTP Hardware Clock)
virtual clocks, which are based on PHC physical clock
providing hardware timestamp to network packets.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

8 files changed, 167 insertions, 1 deletions

diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index 6ea91e41593f..c86628e6a235 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -212,6 +212,7 @@ Userspace to kernel:
   ``ETHTOOL_MSG_FEC_SET``               set FEC settings
   ``ETHTOOL_MSG_MODULE_EEPROM_GET``     read SFP module EEPROM
   ``ETHTOOL_MSG_STATS_GET``             get standard statistics
+  ``ETHTOOL_MSG_PHC_VCLOCKS_GET``       get PHC virtual clocks info
   ===================================== ================================
 
 Kernel to userspace:
@@ -250,6 +251,7 @@ Kernel to userspace:
   ``ETHTOOL_MSG_FEC_NTF``                  FEC settings
   ``ETHTOOL_MSG_MODULE_EEPROM_GET_REPLY``  read SFP module EEPROM
   ``ETHTOOL_MSG_STATS_GET_REPLY``          standard statistics
+  ``ETHTOOL_MSG_PHC_VCLOCKS_GET_REPLY``    PHC virtual clocks info
   ======================================== =================================
 
 ``GET`` requests are sent by userspace applications to retrieve device
@@ -1477,6 +1479,25 @@ Low and high bounds are inclusive, for example:
  etherStatsPkts512to1023Octets 512  1023
  ============================= ==== ====
 
+PHC_VCLOCKS_GET
+===============
+
+Query device PHC virtual clocks information.
+
+Request contents:
+
+  ====================================  ======  ==========================
+  ``ETHTOOL_A_PHC_VCLOCKS_HEADER``      nested  request header
+  ====================================  ======  ==========================
+
+Kernel response contents:
+
+  ====================================  ======  ==========================
+  ``ETHTOOL_A_PHC_VCLOCKS_HEADER``      nested  reply header
+  ``ETHTOOL_A_PHC_VCLOCKS_NUM``         u32     PHC virtual clocks number
+  ``ETHTOOL_A_PHC_VCLOCKS_INDEX``       s32     PHC index array
+  ====================================  ======  ==========================
+
 Request translation
 ===================
 
@@ -1575,4 +1596,5 @@ are netlink only.
   n/a                                 ``ETHTOOL_MSG_CABLE_TEST_ACT``
   n/a                                 ``ETHTOOL_MSG_CABLE_TEST_TDR_ACT``
   n/a                                 ``ETHTOOL_MSG_TUNNEL_INFO_GET``
+  n/a                                 ``ETHTOOL_MSG_PHC_VCLOCKS_GET``
   =================================== =====================================
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 29dbb603bc91..232daaec56e4 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -758,6 +758,16 @@ ethtool_params_from_link_mode(struct ethtool_link_ksettings *link_ksettings,
 			      enum ethtool_link_mode_bit_indices link_mode);
 
 /**
+ * ethtool_get_phc_vclocks - Derive phc vclocks information, and caller
+ *                           is responsible to free memory of vclock_index
+ * @dev: pointer to net_device structure
+ * @vclock_index: pointer to pointer of vclock index
+ *
+ * Return number of phc vclocks
+ */
+int ethtool_get_phc_vclocks(struct net_device *dev, int **vclock_index);
+
+/**
  * ethtool_sprintf - Write formatted string to ethtool string data
  * @data: Pointer to start of string to update
  * @fmt: Format of string to write
diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index c7135c9c37a5..b3b93710eff7 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -46,6 +46,7 @@ enum {
 	ETHTOOL_MSG_FEC_SET,
 	ETHTOOL_MSG_MODULE_EEPROM_GET,
 	ETHTOOL_MSG_STATS_GET,
+	ETHTOOL_MSG_PHC_VCLOCKS_GET,
 
 	/* add new constants above here */
 	__ETHTOOL_MSG_USER_CNT,
@@ -88,6 +89,7 @@ enum {
 	ETHTOOL_MSG_FEC_NTF,
 	ETHTOOL_MSG_MODULE_EEPROM_GET_REPLY,
 	ETHTOOL_MSG_STATS_GET_REPLY,
+	ETHTOOL_MSG_PHC_VCLOCKS_GET_REPLY,
 
 	/* add new constants above here */
 	__ETHTOOL_MSG_KERNEL_CNT,
@@ -440,6 +442,19 @@ enum {
 	ETHTOOL_A_TSINFO_MAX = (__ETHTOOL_A_TSINFO_CNT - 1)
 };
 
+/* PHC VCLOCKS */
+
+enum {
+	ETHTOOL_A_PHC_VCLOCKS_UNSPEC,
+	ETHTOOL_A_PHC_VCLOCKS_HEADER,			/* nest - _A_HEADER_* */
+	ETHTOOL_A_PHC_VCLOCKS_NUM,			/* u32 */
+	ETHTOOL_A_PHC_VCLOCKS_INDEX,			/* array, s32 */
+
+	/* add new constants above here */
+	__ETHTOOL_A_PHC_VCLOCKS_CNT,
+	ETHTOOL_A_PHC_VCLOCKS_MAX = (__ETHTOOL_A_PHC_VCLOCKS_CNT - 1)
+};
+
 /* CABLE TEST */
 
 enum {
diff --git a/net/ethtool/Makefile b/net/ethtool/Makefile
index 723c9a8a8cdf..0a19470efbfb 100644
--- a/net/ethtool/Makefile
+++ b/net/ethtool/Makefile
@@ -7,4 +7,4 @@ obj-$(CONFIG_ETHTOOL_NETLINK)	+= ethtool_nl.o
 ethtool_nl-y	:= netlink.o bitset.o strset.o linkinfo.o linkmodes.o \
 		   linkstate.o debug.o wol.o features.o privflags.o rings.o \
 		   channels.o coalesce.o pause.o eee.o tsinfo.o cabletest.o \
-		   tunnels.o fec.o eeprom.o stats.o
+		   tunnels.o fec.o eeprom.o stats.o phc_vclocks.o
diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index f9dcbad84788..798231b07676 100644
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -4,6 +4,7 @@
 #include <linux/net_tstamp.h>
 #include <linux/phy.h>
 #include <linux/rtnetlink.h>
+#include <linux/ptp_clock_kernel.h>
 
 #include "common.h"
 
@@ -554,6 +555,18 @@ int __ethtool_get_ts_info(struct net_device *dev, struct ethtool_ts_info *info)
 	return 0;
 }
 
+int ethtool_get_phc_vclocks(struct net_device *dev, int **vclock_index)
+{
+	struct ethtool_ts_info info = { };
+	int num = 0;
+
+	if (!__ethtool_get_ts_info(dev, &info))
+		num = ptp_get_vclocks_index(info.phc_index, vclock_index);
+
+	return num;
+}
+EXPORT_SYMBOL(ethtool_get_phc_vclocks);
+
 const struct ethtool_phy_ops *ethtool_phy_ops;
 
 void ethtool_set_ethtool_phy_ops(const struct ethtool_phy_ops *ops)
diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index a7346346114f..73e0f5b626bf 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -248,6 +248,7 @@ ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {
 	[ETHTOOL_MSG_TSINFO_GET]	= &ethnl_tsinfo_request_ops,
 	[ETHTOOL_MSG_MODULE_EEPROM_GET]	= &ethnl_module_eeprom_request_ops,
 	[ETHTOOL_MSG_STATS_GET]		= &ethnl_stats_request_ops,
+	[ETHTOOL_MSG_PHC_VCLOCKS_GET]	= &ethnl_phc_vclocks_request_ops,
 };
 
 static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
@@ -958,6 +959,15 @@ static const struct genl_ops ethtool_genl_ops[] = {
 		.policy = ethnl_stats_get_policy,
 		.maxattr = ARRAY_SIZE(ethnl_stats_get_policy) - 1,
 	},
+	{
+		.cmd	= ETHTOOL_MSG_PHC_VCLOCKS_GET,
+		.doit	= ethnl_default_doit,
+		.start	= ethnl_default_start,
+		.dumpit	= ethnl_default_dumpit,
+		.done	= ethnl_default_done,
+		.policy = ethnl_phc_vclocks_get_policy,
+		.maxattr = ARRAY_SIZE(ethnl_phc_vclocks_get_policy) - 1,
+	},
 };
 
 static const struct genl_multicast_group ethtool_nl_mcgrps[] = {
diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index 3e25a47fd482..3fc395c86702 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -347,6 +347,7 @@ extern const struct ethnl_request_ops ethnl_tsinfo_request_ops;
 extern const struct ethnl_request_ops ethnl_fec_request_ops;
 extern const struct ethnl_request_ops ethnl_module_eeprom_request_ops;
 extern const struct ethnl_request_ops ethnl_stats_request_ops;
+extern const struct ethnl_request_ops ethnl_phc_vclocks_request_ops;
 
 extern const struct nla_policy ethnl_header_policy[ETHTOOL_A_HEADER_FLAGS + 1];
 extern const struct nla_policy ethnl_header_policy_stats[ETHTOOL_A_HEADER_FLAGS + 1];
@@ -382,6 +383,7 @@ extern const struct nla_policy ethnl_fec_get_policy[ETHTOOL_A_FEC_HEADER + 1];
 extern const struct nla_policy ethnl_fec_set_policy[ETHTOOL_A_FEC_AUTO + 1];
 extern const struct nla_policy ethnl_module_eeprom_get_policy[ETHTOOL_A_MODULE_EEPROM_I2C_ADDRESS + 1];
 extern const struct nla_policy ethnl_stats_get_policy[ETHTOOL_A_STATS_GROUPS + 1];
+extern const struct nla_policy ethnl_phc_vclocks_get_policy[ETHTOOL_A_PHC_VCLOCKS_HEADER + 1];
 
 int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info);
 int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info);
diff --git a/net/ethtool/phc_vclocks.c b/net/ethtool/phc_vclocks.c
new file mode 100644
index 000000000000..637b2f5297d5
--- /dev/null
+++ b/net/ethtool/phc_vclocks.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2021 NXP
+ */
+#include "netlink.h"
+#include "common.h"
+
+struct phc_vclocks_req_info {
+	struct ethnl_req_info		base;
+};
+
+struct phc_vclocks_reply_data {
+	struct ethnl_reply_data		base;
+	int				num;
+	int				*index;
+};
+
+#define PHC_VCLOCKS_REPDATA(__reply_base) \
+	container_of(__reply_base, struct phc_vclocks_reply_data, base)
+
+const struct nla_policy ethnl_phc_vclocks_get_policy[] = {
+	[ETHTOOL_A_PHC_VCLOCKS_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
+};
+
+static int phc_vclocks_prepare_data(const struct ethnl_req_info *req_base,
+				    struct ethnl_reply_data *reply_base,
+				    struct genl_info *info)
+{
+	struct phc_vclocks_reply_data *data = PHC_VCLOCKS_REPDATA(reply_base);
+	struct net_device *dev = reply_base->dev;
+	int ret;
+
+	ret = ethnl_ops_begin(dev);
+	if (ret < 0)
+		return ret;
+	data->num = ethtool_get_phc_vclocks(dev, &data->index);
+	ethnl_ops_complete(dev);
+
+	return ret;
+}
+
+static int phc_vclocks_reply_size(const struct ethnl_req_info *req_base,
+				  const struct ethnl_reply_data *reply_base)
+{
+	const struct phc_vclocks_reply_data *data =
+		PHC_VCLOCKS_REPDATA(reply_base);
+	int len = 0;
+
+	if (data->num > 0) {
+		len += nla_total_size(sizeof(u32));
+		len += nla_total_size(sizeof(s32) * data->num);
+	}
+
+	return len;
+}
+
+static int phc_vclocks_fill_reply(struct sk_buff *skb,
+				  const struct ethnl_req_info *req_base,
+				  const struct ethnl_reply_data *reply_base)
+{
+	const struct phc_vclocks_reply_data *data =
+		PHC_VCLOCKS_REPDATA(reply_base);
+
+	if (data->num <= 0)
+		return 0;
+
+	if (nla_put_u32(skb, ETHTOOL_A_PHC_VCLOCKS_NUM, data->num) ||
+	    nla_put(skb, ETHTOOL_A_PHC_VCLOCKS_INDEX,
+		    sizeof(s32) * data->num, data->index))
+		return -EMSGSIZE;
+
+	return 0;
+}
+
+static void phc_vclocks_cleanup_data(struct ethnl_reply_data *reply_base)
+{
+	const struct phc_vclocks_reply_data *data =
+		PHC_VCLOCKS_REPDATA(reply_base);
+
+	kfree(data->index);
+}
+
+const struct ethnl_request_ops ethnl_phc_vclocks_request_ops = {
+	.request_cmd		= ETHTOOL_MSG_PHC_VCLOCKS_GET,
+	.reply_cmd		= ETHTOOL_MSG_PHC_VCLOCKS_GET_REPLY,
+	.hdr_attr		= ETHTOOL_A_PHC_VCLOCKS_HEADER,
+	.req_info_size		= sizeof(struct phc_vclocks_req_info),
+	.reply_data_size	= sizeof(struct phc_vclocks_reply_data),
+
+	.prepare_data		= phc_vclocks_prepare_data,
+	.reply_size		= phc_vclocks_reply_size,
+	.fill_reply		= phc_vclocks_fill_reply,
+	.cleanup_data		= phc_vclocks_cleanup_data,
+};