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Subject[PATCH net-next 12/12] ethtool: provide timestamping information with TIMESTAMP_GET request
Date
Implement TIMESTAMP_GET request to get timestamping information for
a network device. This is traditionally available via ETHTOOL_GET_TS_INFO
ioctl request.

Move part of ethtool_get_ts_info() into common.c so that ioctl and netlink
code use the same logic to get timestamping information from the device.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
---
Documentation/networking/ethtool-netlink.rst | 30 +++-
include/uapi/linux/ethtool_netlink.h | 17 +++
net/ethtool/Makefile | 2 +-
net/ethtool/common.c | 21 +++
net/ethtool/common.h | 1 +
net/ethtool/ioctl.c | 23 +--
net/ethtool/netlink.c | 8 ++
net/ethtool/netlink.h | 1 +
net/ethtool/timestamp.c | 143 +++++++++++++++++++
9 files changed, 225 insertions(+), 21 deletions(-)
create mode 100644 net/ethtool/timestamp.c

diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index f1950a0a6c93..478196b36be6 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -203,6 +203,7 @@ Userspace to kernel:
``ETHTOOL_MSG_PAUSE_SET`` set pause parameters
``ETHTOOL_MSG_EEE_GET`` get EEE settings
``ETHTOOL_MSG_EEE_SET`` set EEE settings
+ ``ETHTOOL_MSG_TIMESTAMP_GET`` get timestamping info
===================================== ================================

Kernel to userspace:
@@ -233,6 +234,7 @@ Kernel to userspace:
``ETHTOOL_MSG_PAUSE_NTF`` pause parameters
``ETHTOOL_MSG_EEE_GET_REPLY`` EEE settings
``ETHTOOL_MSG_EEE_NTF`` EEE settings
+ ``ETHTOOL_MSG_TIMESTAMP_GET_REPLY`` timestamping info
===================================== =================================

``GET`` requests are sent by userspace applications to retrieve device
@@ -928,6 +930,32 @@ but only first 32 can be set at the moment as that is what the ``ethtool_ops``
callback supports.


+TIMESTAMP_GET
+=============
+
+Gets timestamping information like ``ETHTOOL_GET_TS_INFO`` ioctl request.
+
+Request contents:
+
+ ===================================== ====== ==========================
+ ``ETHTOOL_A_TIMESTAMP_HEADER`` nested request header
+ ===================================== ====== ==========================
+
+Kernel response contents:
+
+ ===================================== ====== ==========================
+ ``ETHTOOL_A_TIMESTAMP_HEADER`` nested request header
+ ``ETHTOOL_A_TIMESTAMP_TIMESTAMPING`` bitset SO_TIMESTAMPING flags
+ ``ETHTOOL_A_TIMESTAMP_TX_TYPES`` bitset supported Tx types
+ ``ETHTOOL_A_TIMESTAMP_RX_FILTERS`` bitset supported Rx filters
+ ``ETHTOOL_A_TIMESTAMP_PHC_INDEX`` u32 PTP hw clock index
+ ===================================== ====== ==========================
+
+``ETHTOOL_A_TIMESTAMP_PHC_INDEX`` is absent if there is no associated PHC
+(there is no special value for this case). The bitset attributes are omitted
+if they would be empty (no bit set).
+
+
Request translation
===================

@@ -1003,7 +1031,7 @@ have their netlink replacement yet.
``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`` ``ETHTOOL_MSG_TIMESTAMP_GET``
``ETHTOOL_GMODULEINFO`` n/a
``ETHTOOL_GMODULEEEPROM`` n/a
``ETHTOOL_GEEE`` ``ETHTOOL_MSG_EEE_GET``
diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index bacdd5363510..3db2732592b3 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -38,6 +38,7 @@ enum {
ETHTOOL_MSG_PAUSE_SET,
ETHTOOL_MSG_EEE_GET,
ETHTOOL_MSG_EEE_SET,
+ ETHTOOL_MSG_TIMESTAMP_GET,

/* add new constants above here */
__ETHTOOL_MSG_USER_CNT,
@@ -72,6 +73,7 @@ enum {
ETHTOOL_MSG_PAUSE_NTF,
ETHTOOL_MSG_EEE_GET_REPLY,
ETHTOOL_MSG_EEE_NTF,
+ ETHTOOL_MSG_TIMESTAMP_GET_REPLY,

/* add new constants above here */
__ETHTOOL_MSG_KERNEL_CNT,
@@ -386,6 +388,21 @@ enum {
ETHTOOL_A_EEE_MAX = (__ETHTOOL_A_EEE_CNT - 1)
};

+/* TIMESTAMP */
+
+enum {
+ ETHTOOL_A_TIMESTAMP_UNSPEC,
+ ETHTOOL_A_TIMESTAMP_HEADER, /* nest - _A_HEADER_* */
+ ETHTOOL_A_TIMESTAMP_TIMESTAMPING, /* bitset */
+ ETHTOOL_A_TIMESTAMP_TX_TYPES, /* bitset */
+ ETHTOOL_A_TIMESTAMP_RX_FILTERS, /* bitset */
+ ETHTOOL_A_TIMESTAMP_PHC_INDEX, /* u32 */
+
+ /* add new constants above here */
+ __ETHTOOL_A_TIMESTAMP_CNT,
+ ETHTOOL_A_TIMESTAMP_MAX = (__ETHTOOL_A_TIMESTAMP_CNT - 1)
+};
+
/* generic netlink info */
#define ETHTOOL_GENL_NAME "ethtool"
#define ETHTOOL_GENL_VERSION 1
diff --git a/net/ethtool/Makefile b/net/ethtool/Makefile
index a790f408aa5d..17da981bdea7 100644
--- a/net/ethtool/Makefile
+++ b/net/ethtool/Makefile
@@ -6,4 +6,4 @@ 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
+ channels.o coalesce.o pause.o eee.o timestamp.o
diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index 6faa1e0f99a4..9b03ca6c5a6e 100644
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only

#include <linux/net_tstamp.h>
+#include <linux/phy.h>

#include "common.h"

@@ -349,3 +350,23 @@ int ethtool_check_ops(const struct ethtool_ops *ops)
*/
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;
+
+ memset(info, 0, sizeof(*info));
+ info->cmd = ETHTOOL_GET_TS_INFO;
+
+ if (phy_has_tsinfo(phydev))
+ return phy_ts_info(phydev, info);
+ if (ops->get_ts_info)
+ return ops->get_ts_info(dev, info);
+
+ info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
+ SOF_TIMESTAMPING_SOFTWARE;
+ info->phc_index = -1;
+
+ return 0;
+}
diff --git a/net/ethtool/common.h b/net/ethtool/common.h
index c54c8d57fd8f..a62f68ccc43a 100644
--- a/net/ethtool/common.h
+++ b/net/ethtool/common.h
@@ -35,5 +35,6 @@ bool convert_legacy_settings_to_link_ksettings(
struct ethtool_link_ksettings *link_ksettings,
const struct ethtool_cmd *legacy_settings);
int ethtool_get_max_rxfh_channel(struct net_device *dev, u32 *max);
+int __ethtool_get_ts_info(struct net_device *dev, struct ethtool_ts_info *info);

#endif /* _ETHTOOL_COMMON_H */
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 05a2bf64a96b..89d0b1827aaf 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -2140,32 +2140,17 @@ 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;
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 (phy_has_tsinfo(phydev)) {
- err = phy_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;
- }
+ int err;

+ err = __ethtool_get_ts_info(dev, &info);
if (err)
return err;

if (copy_to_user(useraddr, &info, sizeof(info)))
- err = -EFAULT;
+ return -EFAULT;

- return err;
+ return 0;
}

static int __ethtool_get_module_info(struct net_device *dev,
diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index e525c7b8ba4d..25422ff0b87d 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -230,6 +230,7 @@ ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {
[ETHTOOL_MSG_COALESCE_GET] = &ethnl_coalesce_request_ops,
[ETHTOOL_MSG_PAUSE_GET] = &ethnl_pause_request_ops,
[ETHTOOL_MSG_EEE_GET] = &ethnl_eee_request_ops,
+ [ETHTOOL_MSG_TIMESTAMP_GET] = &ethnl_timestamp_request_ops,
};

static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
@@ -831,6 +832,13 @@ static const struct genl_ops ethtool_genl_ops[] = {
.flags = GENL_UNS_ADMIN_PERM,
.doit = ethnl_set_eee,
},
+ {
+ .cmd = ETHTOOL_MSG_TIMESTAMP_GET,
+ .doit = ethnl_default_doit,
+ .start = ethnl_default_start,
+ .dumpit = ethnl_default_dumpit,
+ .done = ethnl_default_done,
+ },
};

static const struct genl_multicast_group ethtool_nl_mcgrps[] = {
diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index a251957d535e..a8dbb2943940 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -344,6 +344,7 @@ extern const struct ethnl_request_ops ethnl_channels_request_ops;
extern const struct ethnl_request_ops ethnl_coalesce_request_ops;
extern const struct ethnl_request_ops ethnl_pause_request_ops;
extern const struct ethnl_request_ops ethnl_eee_request_ops;
+extern const struct ethnl_request_ops ethnl_timestamp_request_ops;

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/timestamp.c b/net/ethtool/timestamp.c
new file mode 100644
index 000000000000..30e6118acdaf
--- /dev/null
+++ b/net/ethtool/timestamp.c
@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/net_tstamp.h>
+
+#include "netlink.h"
+#include "common.h"
+#include "bitset.h"
+
+struct timestamp_req_info {
+ struct ethnl_req_info base;
+};
+
+struct timestamp_reply_data {
+ struct ethnl_reply_data base;
+ struct ethtool_ts_info ts_info;
+};
+
+#define TIMESTAMP_REPDATA(__reply_base) \
+ container_of(__reply_base, struct timestamp_reply_data, base)
+
+static const struct nla_policy
+timestamp_get_policy[ETHTOOL_A_TIMESTAMP_MAX + 1] = {
+ [ETHTOOL_A_TIMESTAMP_UNSPEC] = { .type = NLA_REJECT },
+ [ETHTOOL_A_TIMESTAMP_HEADER] = { .type = NLA_NESTED },
+ [ETHTOOL_A_TIMESTAMP_TIMESTAMPING] = { .type = NLA_REJECT },
+ [ETHTOOL_A_TIMESTAMP_TX_TYPES] = { .type = NLA_REJECT },
+ [ETHTOOL_A_TIMESTAMP_RX_FILTERS] = { .type = NLA_REJECT },
+ [ETHTOOL_A_TIMESTAMP_PHC_INDEX] = { .type = NLA_REJECT },
+};
+
+static int timestamp_prepare_data(const struct ethnl_req_info *req_base,
+ struct ethnl_reply_data *reply_base,
+ struct genl_info *info)
+{
+ struct timestamp_reply_data *data = TIMESTAMP_REPDATA(reply_base);
+ struct net_device *dev = reply_base->dev;
+ int ret;
+
+ ret = ethnl_ops_begin(dev);
+ if (ret < 0)
+ return ret;
+ ret = __ethtool_get_ts_info(dev, &data->ts_info);
+ ethnl_ops_complete(dev);
+
+ return ret;
+}
+
+static int timestamp_reply_size(const struct ethnl_req_info *req_base,
+ const struct ethnl_reply_data *reply_base)
+{
+ const struct timestamp_reply_data *data = TIMESTAMP_REPDATA(reply_base);
+ bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
+ const struct ethtool_ts_info *ts_info = &data->ts_info;
+ int len = 0;
+ int ret;
+
+ BUILD_BUG_ON(__SOF_TIMESTAMPING_CNT > 32);
+ BUILD_BUG_ON(__HWTSTAMP_TX_CNT > 32);
+ BUILD_BUG_ON(__HWTSTAMP_FILTER_CNT > 32);
+
+ if (ts_info->so_timestamping) {
+ ret = ethnl_bitset32_size(&ts_info->so_timestamping, NULL,
+ __SOF_TIMESTAMPING_CNT,
+ sof_timestamping_names, compact);
+ if (ret < 0)
+ return ret;
+ len += ret; /* _TIMESTAMP_TIMESTAMPING */
+ }
+ if (ts_info->tx_types) {
+ ret = ethnl_bitset32_size(&ts_info->tx_types, NULL,
+ __HWTSTAMP_TX_CNT,
+ ts_tx_type_names, compact);
+ if (ret < 0)
+ return ret;
+ len += ret; /* _TIMESTAMP_TX_TYPES */
+ }
+ if (ts_info->rx_filters) {
+ ret = ethnl_bitset32_size(&ts_info->rx_filters, NULL,
+ __HWTSTAMP_FILTER_CNT,
+ ts_rx_filter_names, compact);
+ if (ret < 0)
+ return ret;
+ len += ret; /* _TIMESTAMP_RX_FILTERS */
+ }
+ if (ts_info->phc_index >= 0)
+ len += nla_total_size(sizeof(u32)); /* _TIMESTAMP_PHC_INDEX */
+
+ return len;
+}
+
+static int timestamp_fill_reply(struct sk_buff *skb,
+ const struct ethnl_req_info *req_base,
+ const struct ethnl_reply_data *reply_base)
+{
+ const struct timestamp_reply_data *data = TIMESTAMP_REPDATA(reply_base);
+ bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
+ const struct ethtool_ts_info *ts_info = &data->ts_info;
+ int ret;
+
+ if (ts_info->so_timestamping) {
+ ret = ethnl_put_bitset32(skb, ETHTOOL_A_TIMESTAMP_TIMESTAMPING,
+ &ts_info->so_timestamping, NULL,
+ __SOF_TIMESTAMPING_CNT,
+ sof_timestamping_names, compact);
+ if (ret < 0)
+ return ret;
+ }
+ if (ts_info->tx_types) {
+ ret = ethnl_put_bitset32(skb, ETHTOOL_A_TIMESTAMP_TX_TYPES,
+ &ts_info->tx_types, NULL,
+ __HWTSTAMP_TX_CNT,
+ ts_tx_type_names, compact);
+ if (ret < 0)
+ return ret;
+ }
+ if (ts_info->rx_filters) {
+ ret = ethnl_put_bitset32(skb, ETHTOOL_A_TIMESTAMP_RX_FILTERS,
+ &ts_info->rx_filters, NULL,
+ __HWTSTAMP_FILTER_CNT,
+ ts_rx_filter_names, compact);
+ if (ret < 0)
+ return ret;
+ }
+ if (ts_info->phc_index >= 0 &&
+ nla_put_u32(skb, ETHTOOL_A_TIMESTAMP_PHC_INDEX, ts_info->phc_index))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
+const struct ethnl_request_ops ethnl_timestamp_request_ops = {
+ .request_cmd = ETHTOOL_MSG_TIMESTAMP_GET,
+ .reply_cmd = ETHTOOL_MSG_TIMESTAMP_GET_REPLY,
+ .hdr_attr = ETHTOOL_A_TIMESTAMP_HEADER,
+ .max_attr = ETHTOOL_A_TIMESTAMP_MAX,
+ .req_info_size = sizeof(struct timestamp_req_info),
+ .reply_data_size = sizeof(struct timestamp_reply_data),
+ .request_policy = timestamp_get_policy,
+
+ .prepare_data = timestamp_prepare_data,
+ .reply_size = timestamp_reply_size,
+ .fill_reply = timestamp_fill_reply,
+};
--
2.25.1
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