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Message-Id: <20250506-feature_ptp_source-v2-1-dec1c3181a7e@bootlin.com>
Date: Tue, 06 May 2025 14:18:45 +0200
From: Kory Maincent <kory.maincent@...tlin.com>
To: Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>,
Donald Hunter <donald.hunter@...il.com>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
Willem de Bruijn <willemdebruijn.kernel@...il.com>,
Jason Xing <kernelxing@...cent.com>,
Richard Cochran <richardcochran@...il.com>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
Maxime Chevallier <maxime.chevallier@...tlin.com>,
"Russell King (Oracle)" <linux@...linux.org.uk>,
Kory Maincent <kory.maincent@...tlin.com>
Subject: [PATCH net-next v2] net: Add support for providing the PTP
hardware source in tsinfo
Multi-PTP source support within a network topology has been merged,
but the hardware timestamp source is not yet exposed to users.
Currently, users only see the PTP index, which does not indicate
whether the timestamp comes from a PHY or a MAC.
Add support for reporting the hwtstamp source using a
hwtstamp-source field, alongside hwtstamp-phyindex, to describe
the origin of the hardware timestamp.
Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
---
Change in v2:
- Move hwtstamp_source enum from uapi/linux/net_tstamp.h to
uapi/linux/ethtool.h
- Remove HWTSTAMP_SOURCE_UNSPEC enum value.
- Made a few change in net/ethtool/common.c to report the source only
if get_ts_info does not return an error and if there is a hardware
timestamp with a phc index.
- Link to v1: https://lore.kernel.org/r/20250425-feature_ptp_source-v1-1-c2dfe7b2b8b4@bootlin.com
---
Documentation/netlink/specs/ethtool.yaml | 16 ++++++++++++++
include/linux/ethtool.h | 4 ++++
include/linux/net_tstamp.h | 7 +------
include/uapi/linux/ethtool.h | 12 +++++++++++
include/uapi/linux/ethtool_netlink_generated.h | 2 ++
net/ethtool/common.c | 29 +++++++++++++++++++++-----
net/ethtool/tsinfo.c | 23 ++++++++++++++++++++
7 files changed, 82 insertions(+), 11 deletions(-)
diff --git a/Documentation/netlink/specs/ethtool.yaml b/Documentation/netlink/specs/ethtool.yaml
index c650cd3dcb80bc93c5039dc8ba2c5c18793ff987..20c6b2bf5defabcb4db7753c50233a9fc4c341e6 100644
--- a/Documentation/netlink/specs/ethtool.yaml
+++ b/Documentation/netlink/specs/ethtool.yaml
@@ -98,6 +98,13 @@ definitions:
name: tcp-data-split
type: enum
entries: [ unknown, disabled, enabled ]
+ -
+ name: ts-hwtstamp-source
+ enum-name: hwtstamp-source
+ header: linux/ethtool.h
+ type: enum
+ name-prefix: hwtstamp-source
+ entries: [ netdev, phylib ]
attribute-sets:
-
@@ -896,6 +903,13 @@ attribute-sets:
name: hwtstamp-provider
type: nest
nested-attributes: ts-hwtstamp-provider
+ -
+ name: hwtstamp-source
+ type: u32
+ enum: ts-hwtstamp-source
+ -
+ name: hwtstamp-phyindex
+ type: u32
-
name: cable-result
attr-cnt-name: __ethtool-a-cable-result-cnt
@@ -1981,6 +1995,8 @@ operations:
- phc-index
- stats
- hwtstamp-provider
+ - hwtstamp-source
+ - hwtstamp-phyindex
dump: *tsinfo-get-op
-
name: cable-test-act
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 117718c2481439d09f60cd596012dfa0feef3ca8..f18fc8269f7066eadd6fa823e0d43b4ae50b8c46 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -830,6 +830,8 @@ struct ethtool_rxfh_param {
* @so_timestamping: bit mask of the sum of the supported SO_TIMESTAMPING flags
* @phc_index: device index of the associated PHC, or -1 if there is none
* @phc_qualifier: qualifier of the associated PHC
+ * @phc_source: source device of the associated PHC
+ * @phc_phyindex: index of PHY device source of the associated PHC
* @tx_types: bit mask of the supported hwtstamp_tx_types enumeration values
* @rx_filters: bit mask of the supported hwtstamp_rx_filters enumeration values
*/
@@ -838,6 +840,8 @@ struct kernel_ethtool_ts_info {
u32 so_timestamping;
int phc_index;
enum hwtstamp_provider_qualifier phc_qualifier;
+ enum hwtstamp_source phc_source;
+ int phc_phyindex;
enum hwtstamp_tx_types tx_types;
enum hwtstamp_rx_filters rx_filters;
};
diff --git a/include/linux/net_tstamp.h b/include/linux/net_tstamp.h
index ff0758e88ea1008efe533cde003b12719bf4fcd3..efbd0229e0419bd07d854616a4344c6e97aa765f 100644
--- a/include/linux/net_tstamp.h
+++ b/include/linux/net_tstamp.h
@@ -4,6 +4,7 @@
#define _LINUX_NET_TIMESTAMPING_H_
#include <uapi/linux/net_tstamp.h>
+#include <uapi/linux/ethtool.h>
#define SOF_TIMESTAMPING_SOFTWARE_MASK (SOF_TIMESTAMPING_RX_SOFTWARE | \
SOF_TIMESTAMPING_TX_SOFTWARE | \
@@ -13,12 +14,6 @@
SOF_TIMESTAMPING_TX_HARDWARE | \
SOF_TIMESTAMPING_RAW_HARDWARE)
-enum hwtstamp_source {
- HWTSTAMP_SOURCE_UNSPEC,
- HWTSTAMP_SOURCE_NETDEV,
- HWTSTAMP_SOURCE_PHYLIB,
-};
-
/**
* struct hwtstamp_provider_desc - hwtstamp provider description
*
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 84833cca29fec4dcf07626f1094d2e4a230e3301..1d886682b4b531be1c318ab425a1d5dea6572285 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -1730,6 +1730,18 @@ struct ethtool_ts_info {
__u32 rx_reserved[3];
};
+/**
+ * enum hwtstamp_source - Source of the hardware timestamp
+ * @HWTSTAMP_SOURCE_NETDEV: Hardware timestamp comes from a MAC or a device
+ * which has MAC and PHY integrated
+ * @HWTSTAMP_SOURCE_PHYLIB: Hardware timestamp comes from one PHY device
+ * of the network topology
+ */
+enum hwtstamp_source {
+ HWTSTAMP_SOURCE_NETDEV = 1,
+ HWTSTAMP_SOURCE_PHYLIB,
+};
+
/*
* %ETHTOOL_SFEATURES changes features present in features[].valid to the
* values of corresponding bits in features[].requested. Bits in .requested
diff --git a/include/uapi/linux/ethtool_netlink_generated.h b/include/uapi/linux/ethtool_netlink_generated.h
index 30c8dad6214e9a882f1707e4835e9efc73c3f92e..7cbcf44d0a3284490006961d3513c58ccda98038 100644
--- a/include/uapi/linux/ethtool_netlink_generated.h
+++ b/include/uapi/linux/ethtool_netlink_generated.h
@@ -401,6 +401,8 @@ enum {
ETHTOOL_A_TSINFO_PHC_INDEX,
ETHTOOL_A_TSINFO_STATS,
ETHTOOL_A_TSINFO_HWTSTAMP_PROVIDER,
+ ETHTOOL_A_TSINFO_HWTSTAMP_SOURCE,
+ ETHTOOL_A_TSINFO_HWTSTAMP_PHYINDEX,
__ETHTOOL_A_TSINFO_CNT,
ETHTOOL_A_TSINFO_MAX = (__ETHTOOL_A_TSINFO_CNT - 1)
diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index 49bea6b45bd5c1951ff1a52a9f30791040044d10..eb253e0fd61b5d84c0d5d6c24e19e665b6182f2f 100644
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -921,9 +921,18 @@ int ethtool_get_ts_info_by_phc(struct net_device *dev,
phy = ethtool_phy_get_ts_info_by_phc(dev, info, hwprov_desc);
if (IS_ERR(phy))
- err = PTR_ERR(phy);
- else
- err = 0;
+ return PTR_ERR(phy);
+
+ /* Report the phc source only if we have a real
+ * phc source with an index.
+ */
+ if (info->phc_index >= 0) {
+ info->phc_source = HWTSTAMP_SOURCE_PHYLIB;
+ info->phc_phyindex = phy->phyindex;
+ }
+ err = 0;
+ } else if (!err && info->phc_index >= 0) {
+ info->phc_source = HWTSTAMP_SOURCE_NETDEV;
}
info->so_timestamping |= SOF_TIMESTAMPING_RX_SOFTWARE |
@@ -947,10 +956,20 @@ int __ethtool_get_ts_info(struct net_device *dev,
ethtool_init_tsinfo(info);
if (phy_is_default_hwtstamp(phydev) &&
- phy_has_tsinfo(phydev))
+ phy_has_tsinfo(phydev)) {
err = phy_ts_info(phydev, info);
- else if (ops->get_ts_info)
+ /* Report the phc source only if we have a real
+ * phc source with an index.
+ */
+ if (!err && info->phc_index >= 0) {
+ info->phc_source = HWTSTAMP_SOURCE_PHYLIB;
+ info->phc_phyindex = phydev->phyindex;
+ }
+ } else if (ops->get_ts_info) {
err = ops->get_ts_info(dev, info);
+ if (!err && info->phc_index >= 0)
+ info->phc_source = HWTSTAMP_SOURCE_NETDEV;
+ }
info->so_timestamping |= SOF_TIMESTAMPING_RX_SOFTWARE |
SOF_TIMESTAMPING_SOFTWARE;
diff --git a/net/ethtool/tsinfo.c b/net/ethtool/tsinfo.c
index 8130b406ef107f7311cba15c5aafba3ba82bb5a3..8c654caa6805a5727f479d5438d7a4a2786b8d52 100644
--- a/net/ethtool/tsinfo.c
+++ b/net/ethtool/tsinfo.c
@@ -160,6 +160,12 @@ static int tsinfo_reply_size(const struct ethnl_req_info *req_base,
/* _TSINFO_HWTSTAMP_PROVIDER */
len += nla_total_size(0) + 2 * nla_total_size(sizeof(u32));
}
+ if (ts_info->phc_source) {
+ len += nla_total_size(sizeof(u32)); /* _TSINFO_HWTSTAMP_SOURCE */
+ if (ts_info->phc_phyindex)
+ /* _TSINFO_HWTSTAMP_PHYINDEX */
+ len += nla_total_size(sizeof(u32));
+ }
if (req_base->flags & ETHTOOL_FLAG_STATS)
len += nla_total_size(0) + /* _TSINFO_STATS */
nla_total_size_64bit(sizeof(u64)) * ETHTOOL_TS_STAT_CNT;
@@ -259,6 +265,16 @@ static int tsinfo_fill_reply(struct sk_buff *skb,
nla_nest_end(skb, nest);
}
+ if (ts_info->phc_source) {
+ if (nla_put_u32(skb, ETHTOOL_A_TSINFO_HWTSTAMP_SOURCE,
+ ts_info->phc_source))
+ return -EMSGSIZE;
+
+ if (ts_info->phc_phyindex &&
+ nla_put_u32(skb, ETHTOOL_A_TSINFO_HWTSTAMP_PHYINDEX,
+ ts_info->phc_phyindex))
+ return -EMSGSIZE;
+ }
if (req_base->flags & ETHTOOL_FLAG_STATS &&
tsinfo_put_stats(skb, &data->stats))
return -EMSGSIZE;
@@ -346,6 +362,11 @@ static int ethnl_tsinfo_dump_one_phydev(struct sk_buff *skb,
if (ret < 0)
goto err;
+ if (reply_data->ts_info.phc_index >= 0) {
+ reply_data->ts_info.phc_source = HWTSTAMP_SOURCE_PHYLIB;
+ reply_data->ts_info.phc_phyindex = phydev->phyindex;
+ }
+
ret = ethnl_tsinfo_end_dump(skb, dev, req_info, reply_data, ehdr);
if (ret < 0)
goto err;
@@ -389,6 +410,8 @@ static int ethnl_tsinfo_dump_one_netdev(struct sk_buff *skb,
if (ret < 0)
goto err;
+ if (reply_data->ts_info.phc_index >= 0)
+ reply_data->ts_info.phc_source = HWTSTAMP_SOURCE_NETDEV;
ret = ethnl_tsinfo_end_dump(skb, dev, req_info, reply_data,
ehdr);
if (ret < 0)
---
base-commit: 836b313a14a316290886dcc2ce7e78bf5ecc8658
change-id: 20250418-feature_ptp_source-df4a98c94139
Best regards,
--
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com
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