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Message-Id: <20231009155138.86458-16-kory.maincent@bootlin.com>
Date: Mon, 9 Oct 2023 17:51:37 +0200
From: Köry Maincent <kory.maincent@...tlin.com>
To: netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
"David S . Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Jonathan Corbet <corbet@....net>,
Jay Vosburgh <j.vosburgh@...il.com>,
Andy Gospodarek <andy@...yhouse.net>,
Nicolas Ferre <nicolas.ferre@...rochip.com>,
Claudiu Beznea <claudiu.beznea@...on.dev>,
Horatiu Vultur <horatiu.vultur@...rochip.com>,
UNGLinuxDriver@...rochip.com,
Florian Fainelli <florian.fainelli@...adcom.com>,
Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
Andrew Lunn <andrew@...n.ch>,
Heiner Kallweit <hkallweit1@...il.com>,
Russell King <linux@...linux.org.uk>,
Richard Cochran <richardcochran@...il.com>,
Radu Pirea <radu-nicolae.pirea@....nxp.com>,
Willem de Bruijn <willemdebruijn.kernel@...il.com>,
Vladimir Oltean <vladimir.oltean@....com>,
Michael Walle <michael@...le.cc>,
Jacob Keller <jacob.e.keller@...el.com>,
Maxime Chevallier <maxime.chevallier@...tlin.com>,
Kory Maincent <kory.maincent@...tlin.com>
Subject: [PATCH net-next v5 15/16] net ethtool: net: Let the active time stamping layer be selectable
From: Kory Maincent <kory.maincent@...tlin.com>
Now that the current timestamp is saved in a variable lets add the
ETHTOOL_MSG_TS_SET ethtool netlink socket to make it selectable.
Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
---
Changes in v2:
- Move selected_timestamping_layer introduction in this patch.
- Replace strmcmp by sysfs_streq.
- Use the PHY timestamp only if available.
Changes in v3:
- Add a devicetree binding to select the preferred timestamp
- Replace the way to select timestamp through ethtool instead of sysfs
You can test it with the ethtool source on branch feature_ptp of:
https://github.com/kmaincent/ethtool
Changes in v4:
- Change the API to select MAC default time stamping instead of the PHY.
- Add a whitelist to no break the old timestamp PHY default preferences
for current PHY.
- Replace the ethtool ioctl by netlink.
- Add a netdev notifier to allow network device to create trap on PTP
packets. Not tested as it need to change the lan966x driver that
implement packet traps. I will do after the hwtstamp management change
to NDOs.
Changes in v5:
- Remove the netdev notifier added in v4.
- Extract the default timestamp API change in another patch.
---
Documentation/networking/ethtool-netlink.rst | 17 +++++
include/uapi/linux/ethtool_netlink.h | 1 +
net/ethtool/netlink.c | 8 +++
net/ethtool/netlink.h | 1 +
net/ethtool/ts.c | 66 ++++++++++++++++++++
5 files changed, 93 insertions(+)
diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index 963a5aacac8d..eb7f8592986b 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -227,6 +227,7 @@ Userspace to kernel:
``ETHTOOL_MSG_MM_SET`` set MAC merge layer parameters
``ETHTOOL_MSG_TS_GET`` get current timestamping
``ETHTOOL_MSG_TS_LIST_GET`` list available timestampings
+ ``ETHTOOL_MSG_TS_SET`` set current timestamping
===================================== =================================
Kernel to userspace:
@@ -2038,6 +2039,21 @@ Kernel response contents:
This command lists all the possible timestamp layer available.
+TS_SET
+======
+
+Modify the selected timestamping.
+
+Request contents:
+
+ ======================= ====== ===================
+ ``ETHTOOL_A_TS_HEADER`` nested reply header
+ ``ETHTOOL_A_TS_LAYER`` u32 timestamping
+ ======================= ====== ===================
+
+This command set the timestamping with one that should be listed by the
+TSLIST_GET command.
+
Request translation
===================
@@ -2146,4 +2162,5 @@ are netlink only.
n/a ``ETHTOOL_MSG_MM_SET``
n/a ``ETHTOOL_MSG_TSLIST_GET``
n/a ``ETHTOOL_MSG_TS_GET``
+ n/a ``ETHTOOL_MSG_TS_SET``
=================================== =====================================
diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index 62b885d44d06..df6c4fcc62c1 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -59,6 +59,7 @@ enum {
ETHTOOL_MSG_MM_SET,
ETHTOOL_MSG_TS_GET,
ETHTOOL_MSG_TS_LIST_GET,
+ ETHTOOL_MSG_TS_SET,
/* add new constants above here */
__ETHTOOL_MSG_USER_CNT,
diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index 842c9db1531f..8322bf71f80d 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -308,6 +308,7 @@ ethnl_default_requests[__ETHTOOL_MSG_USER_CNT] = {
[ETHTOOL_MSG_MM_SET] = ðnl_mm_request_ops,
[ETHTOOL_MSG_TS_GET] = ðnl_ts_request_ops,
[ETHTOOL_MSG_TS_LIST_GET] = ðnl_ts_list_request_ops,
+ [ETHTOOL_MSG_TS_SET] = ðnl_ts_request_ops,
};
static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)
@@ -1148,6 +1149,13 @@ static const struct genl_ops ethtool_genl_ops[] = {
.policy = ethnl_ts_get_policy,
.maxattr = ARRAY_SIZE(ethnl_ts_get_policy) - 1,
},
+ {
+ .cmd = ETHTOOL_MSG_TS_SET,
+ .flags = GENL_UNS_ADMIN_PERM,
+ .doit = ethnl_default_set_doit,
+ .policy = ethnl_ts_set_policy,
+ .maxattr = ARRAY_SIZE(ethnl_ts_set_policy) - 1,
+ },
};
static const struct genl_multicast_group ethtool_nl_mcgrps[] = {
diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index ea8c312db3af..8fedf234b824 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -444,6 +444,7 @@ extern const struct nla_policy ethnl_plca_get_status_policy[ETHTOOL_A_PLCA_HEADE
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];
+extern const struct nla_policy ethnl_ts_set_policy[ETHTOOL_A_TS_MAX + 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);
diff --git a/net/ethtool/ts.c b/net/ethtool/ts.c
index 11041a16de5b..f77297965e03 100644
--- a/net/ethtool/ts.c
+++ b/net/ethtool/ts.c
@@ -59,6 +59,69 @@ static int ts_fill_reply(struct sk_buff *skb,
return nla_put_u32(skb, ETHTOOL_A_TS_LAYER, data->ts_layer);
}
+/* TS_SET */
+const struct nla_policy ethnl_ts_set_policy[] = {
+ [ETHTOOL_A_TS_HEADER] = NLA_POLICY_NESTED(ethnl_header_policy),
+ [ETHTOOL_A_TS_LAYER] = NLA_POLICY_RANGE(NLA_U32, 0,
+ __TIMESTAMPING_COUNT - 1)
+};
+
+static int ethnl_set_ts_validate(struct ethnl_req_info *req_info,
+ struct genl_info *info)
+{
+ struct nlattr **tb = info->attrs;
+ const struct net_device_ops *ops = req_info->dev->netdev_ops;
+
+ if (!tb[ETHTOOL_A_TS_LAYER])
+ return 0;
+
+ if (!ops->ndo_hwtstamp_set)
+ return -EOPNOTSUPP;
+
+ return 1;
+}
+
+static int ethnl_set_ts(struct ethnl_req_info *req_info, struct genl_info *info)
+{
+ struct net_device *dev = req_info->dev;
+ const struct ethtool_ops *ops = dev->ethtool_ops;
+ struct kernel_hwtstamp_config config = {0};
+ struct nlattr **tb = info->attrs;
+ bool mod = false;
+ u32 ts_layer;
+ int ret;
+
+ ts_layer = dev->ts_layer;
+ ethnl_update_u32(&ts_layer, tb[ETHTOOL_A_TS_LAYER], &mod);
+
+ if (!mod)
+ return 0;
+
+ if (ts_layer & NETDEV_TIMESTAMPING && !ops->get_ts_info) {
+ NL_SET_ERR_MSG_ATTR(info->extack, tb[ETHTOOL_A_TS_LAYER],
+ "this device cannot support timestamping");
+ return -EINVAL;
+ }
+
+ if (ts_layer & PHYLIB_TIMESTAMPING && !phy_has_tsinfo(dev->phydev)) {
+ NL_SET_ERR_MSG_ATTR(info->extack, tb[ETHTOOL_A_TS_LAYER],
+ "this device cannot support timestamping");
+ return -EINVAL;
+ }
+
+ /* Disable time stamping in the current layer. */
+ if (netif_device_present(dev) &&
+ dev->ts_layer & (PHYLIB_TIMESTAMPING | NETDEV_TIMESTAMPING)) {
+ ret = dev_set_hwtstamp_phylib(dev, &config, info->extack);
+ if (ret < 0)
+ return ret;
+ }
+
+ dev->ts_layer = ts_layer;
+
+ return 1;
+}
+
const struct ethnl_request_ops ethnl_ts_request_ops = {
.request_cmd = ETHTOOL_MSG_TS_GET,
.reply_cmd = ETHTOOL_MSG_TS_GET_REPLY,
@@ -69,6 +132,9 @@ const struct ethnl_request_ops ethnl_ts_request_ops = {
.prepare_data = ts_prepare_data,
.reply_size = ts_reply_size,
.fill_reply = ts_fill_reply,
+
+ .set_validate = ethnl_set_ts_validate,
+ .set = ethnl_set_ts,
};
/* TS_LIST_GET */
--
2.25.1
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