@@ -225,6 +225,7 @@ Userspace to kernel:
``ETHTOOL_MSG_RSS_GET`` get RSS settings
``ETHTOOL_MSG_MM_GET`` get MAC merge layer state
``ETHTOOL_MSG_MM_SET`` set MAC merge layer parameters
+ ``ETHTOOL_MSG_TS_GET`` get current timestamping
===================================== =================================
Kernel to userspace:
@@ -268,6 +269,7 @@ Kernel to userspace:
``ETHTOOL_MSG_PSE_GET_REPLY`` PSE parameters
``ETHTOOL_MSG_RSS_GET_REPLY`` RSS settings
``ETHTOOL_MSG_MM_GET_REPLY`` MAC merge layer status
+ ``ETHTOOL_MSG_TS_GET_REPLY`` current timestamping
======================================== =================================
``GET`` requests are sent by userspace applications to retrieve device
@@ -1994,6 +1996,26 @@ The attributes are propagated to the driver through the following structure:
.. kernel-doc:: include/linux/ethtool.h
:identifiers: ethtool_mm_cfg
+TS_GET
+======
+
+Gets current timestamping.
+
+Request contents:
+
+ ================================= ====== ====================
+ ``ETHTOOL_A_TS_HEADER`` nested request header
+ ================================= ====== ====================
+
+Kernel response contents:
+
+ ======================= ====== ==============================
+ ``ETHTOOL_A_TS_HEADER`` nested reply header
+ ``ETHTOOL_A_TS_LAYER`` u32 current timestamping
+ ======================= ====== ==============================
+
+This command get the current timestamp layer.
+
Request translation
===================
@@ -2100,4 +2122,5 @@ are netlink only.
n/a ``ETHTOOL_MSG_PLCA_GET_STATUS``
n/a ``ETHTOOL_MSG_MM_GET``
n/a ``ETHTOOL_MSG_MM_SET``
+ n/a ``ETHTOOL_MSG_TS_GET``
=================================== =====================================
@@ -57,6 +57,7 @@ enum {
ETHTOOL_MSG_PLCA_GET_STATUS,
ETHTOOL_MSG_MM_GET,
ETHTOOL_MSG_MM_SET,
+ ETHTOOL_MSG_TS_GET,
/* add new constants above here */
__ETHTOOL_MSG_USER_CNT,
@@ -109,6 +110,7 @@ enum {
ETHTOOL_MSG_PLCA_NTF,
ETHTOOL_MSG_MM_GET_REPLY,
ETHTOOL_MSG_MM_NTF,
+ ETHTOOL_MSG_TS_GET_REPLY,
/* add new constants above here */
__ETHTOOL_MSG_KERNEL_CNT,
@@ -975,6 +977,18 @@ enum {
ETHTOOL_A_MM_MAX = (__ETHTOOL_A_MM_CNT - 1)
};
+/* TS LAYER */
+
+enum {
+ ETHTOOL_A_TS_UNSPEC,
+ ETHTOOL_A_TS_HEADER, /* nest - _A_HEADER_* */
+ ETHTOOL_A_TS_LAYER, /* u32 */
+
+ /* add new constants above here */
+ __ETHTOOL_A_TS_CNT,
+ ETHTOOL_A_TS_MAX = (__ETHTOOL_A_TS_CNT - 1)
+};
+
/* generic netlink info */
#define ETHTOOL_GENL_NAME "ethtool"
#define ETHTOOL_GENL_VERSION 1
@@ -13,6 +13,16 @@
#include <linux/types.h>
#include <linux/socket.h> /* for SO_TIMESTAMPING */
+/* Layer of the TIMESTAMPING provider */
+enum timestamping_layer {
+ NO_TIMESTAMPING,
+ SOFTWARE_TIMESTAMPING,
+ MAC_TIMESTAMPING,
+ PHY_TIMESTAMPING,
+
+ __TIMESTAMPING_COUNT,
+};
+
/* SO_TIMESTAMPING flags */
enum {
SOF_TIMESTAMPING_TX_HARDWARE = (1<<0),
@@ -8,4 +8,4 @@ ethtool_nl-y := netlink.o bitset.o strset.o linkinfo.o linkmodes.o rss.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 phc_vclocks.o mm.o \
- module.o pse-pd.o plca.o mm.o
+ module.o pse-pd.o plca.o mm.o ts.o
@@ -35,6 +35,7 @@ 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];
+extern const char ts_layer_names[][ETH_GSTRING_LEN];
extern const char udp_tunnel_type_names[][ETH_GSTRING_LEN];
int __ethtool_get_link(struct net_device *dev);
@@ -306,6 +306,7 @@ ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {
[ETHTOOL_MSG_PLCA_GET_STATUS] = ðnl_plca_status_request_ops,
[ETHTOOL_MSG_MM_GET] = ðnl_mm_request_ops,
[ETHTOOL_MSG_MM_SET] = ðnl_mm_request_ops,
+ [ETHTOOL_MSG_TS_GET] = ðnl_ts_request_ops,
};
static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
@@ -1128,6 +1129,15 @@ static const struct genl_ops ethtool_genl_ops[] = {
.policy = ethnl_mm_set_policy,
.maxattr = ARRAY_SIZE(ethnl_mm_set_policy) - 1,
},
+ {
+ .cmd = ETHTOOL_MSG_TS_GET,
+ .doit = ethnl_default_doit,
+ .start = ethnl_default_start,
+ .dumpit = ethnl_default_dumpit,
+ .done = ethnl_default_done,
+ .policy = ethnl_ts_get_policy,
+ .maxattr = ARRAY_SIZE(ethnl_ts_get_policy) - 1,
+ },
};
static const struct genl_multicast_group ethtool_nl_mcgrps[] = {
@@ -395,6 +395,7 @@ extern const struct ethnl_request_ops ethnl_rss_request_ops;
extern const struct ethnl_request_ops ethnl_plca_cfg_request_ops;
extern const struct ethnl_request_ops ethnl_plca_status_request_ops;
extern const struct ethnl_request_ops ethnl_mm_request_ops;
+extern const struct ethnl_request_ops ethnl_ts_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];
@@ -441,6 +442,7 @@ extern const struct nla_policy ethnl_plca_set_cfg_policy[ETHTOOL_A_PLCA_MAX + 1]
extern const struct nla_policy ethnl_plca_get_status_policy[ETHTOOL_A_PLCA_HEADER + 1];
extern const struct nla_policy ethnl_mm_get_policy[ETHTOOL_A_MM_HEADER + 1];
extern const struct nla_policy ethnl_mm_set_policy[ETHTOOL_A_MM_MAX + 1];
+extern const struct nla_policy ethnl_ts_get_policy[ETHTOOL_A_TS_HEADER + 1];
int ethnl_set_features(struct sk_buff *skb, struct genl_info *info);
int ethnl_act_cable_test(struct sk_buff *skb, struct genl_info *info);
new file mode 100644
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/net_tstamp.h>
+#include <linux/phy.h>
+
+#include "netlink.h"
+#include "common.h"
+#include "bitset.h"
+
+struct ts_req_info {
+ struct ethnl_req_info base;
+};
+
+struct ts_reply_data {
+ struct ethnl_reply_data base;
+ enum timestamping_layer ts_layer;
+};
+
+#define TS_REPDATA(__reply_base) \
+ container_of(__reply_base, struct ts_reply_data, base)
+
+/* TS_GET */
+const struct nla_policy ethnl_ts_get_policy[] = {
+ [ETHTOOL_A_TS_HEADER] =
+ NLA_POLICY_NESTED(ethnl_header_policy),
+};
+
+static int ts_prepare_data(const struct ethnl_req_info *req_base,
+ struct ethnl_reply_data *reply_base,
+ const struct genl_info *info)
+{
+ struct ts_reply_data *data = TS_REPDATA(reply_base);
+ struct net_device *dev = reply_base->dev;
+ const struct ethtool_ops *ops = dev->ethtool_ops;
+ int ret;
+
+ ret = ethnl_ops_begin(dev);
+ if (ret < 0)
+ return ret;
+
+ if (phy_has_tsinfo(dev->phydev)) {
+ data->ts_layer = PHY_TIMESTAMPING;
+ } else if (ops->get_ts_info) {
+ struct ethtool_ts_info ts_info = {0};
+
+ ops->get_ts_info(dev, &ts_info);
+ if (ts_info.so_timestamping &
+ SOF_TIMESTAMPING_HARDWARE_MASK)
+ data->ts_layer = MAC_TIMESTAMPING;
+
+ if (ts_info.so_timestamping &
+ SOF_TIMESTAMPING_SOFTWARE_MASK)
+ data->ts_layer = SOFTWARE_TIMESTAMPING;
+ } else {
+ data->ts_layer = NO_TIMESTAMPING;
+ }
+
+ ethnl_ops_complete(dev);
+
+ return ret;
+}
+
+static int ts_reply_size(const struct ethnl_req_info *req_base,
+ const struct ethnl_reply_data *reply_base)
+{
+ return nla_total_size(sizeof(u32));
+}
+
+static int ts_fill_reply(struct sk_buff *skb,
+ const struct ethnl_req_info *req_base,
+ const struct ethnl_reply_data *reply_base)
+{
+ struct ts_reply_data *data = TS_REPDATA(reply_base);
+
+ return nla_put_u32(skb, ETHTOOL_A_TS_LAYER, data->ts_layer);
+}
+
+const struct ethnl_request_ops ethnl_ts_request_ops = {
+ .request_cmd = ETHTOOL_MSG_TS_GET,
+ .reply_cmd = ETHTOOL_MSG_TS_GET_REPLY,
+ .hdr_attr = ETHTOOL_A_TS_HEADER,
+ .req_info_size = sizeof(struct ts_req_info),
+ .reply_data_size = sizeof(struct ts_reply_data),
+
+ .prepare_data = ts_prepare_data,
+ .reply_size = ts_reply_size,
+ .fill_reply = ts_fill_reply,
+};
Time stamping on network packets may happen either in the MAC or in the PHY, but not both. In preparation for making the choice selectable, expose both the current layers via ethtool. In accordance with the kernel implementation as it stands, the current layer will always read as "phy" when a PHY time stamping device is present. Future patches will allow changing the current layer administratively. Signed-off-by: Kory Maincent <kory.maincent@bootlin.com> --- Changes in v2: - Move the introduction of selected_timestamping_layer variable in next patch. Changes in v3: - Move on to ethtool instead of syfs Changes in v4: - Move on to netlink ethtool instead of ioctl. I am not familiar with netlink so there might be some code that does not follow the good code practice. Changes in v5: - Rename timestamping layers. - Set a default value of ts_layer in __ethtool_get_ts_info function. - Separate TS_GET and TS_LIST_GET ethtool command in two separate patches. - Update documentation. Changes in v6: - Moved back to a timestamping_layer simple enum. - Moved back to MAC/PHY_TIMESTAMING namings. - Add SOFTWARE timestamping description. --- Documentation/networking/ethtool-netlink.rst | 23 ++++++++ include/uapi/linux/ethtool_netlink.h | 14 +++++ include/uapi/linux/net_tstamp.h | 10 ++++ net/ethtool/Makefile | 2 +- net/ethtool/common.h | 1 + net/ethtool/netlink.c | 10 ++++ net/ethtool/netlink.h | 2 + net/ethtool/ts.c | 88 ++++++++++++++++++++++++++++ 8 files changed, 149 insertions(+), 1 deletion(-)