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Message-ID: <20240309084440.299358-2-rrameshbabu@nvidia.com>
Date: Sat, 9 Mar 2024 00:44:35 -0800
From: Rahul Rameshbabu <rrameshbabu@...dia.com>
To: rrameshbabu@...dia.com
Cc: ahmed.zaki@...el.com,
aleksander.lobakin@...el.com,
alexandre.torgue@...s.st.com,
andrew@...n.ch,
corbet@....net,
davem@...emloft.net,
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gal@...dia.com,
hkallweit1@...il.com,
jacob.e.keller@...el.com,
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joabreu@...opsys.com,
justinstitt@...gle.com,
kory.maincent@...tlin.com,
kuba@...nel.org,
leon@...nel.org,
linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org,
liuhangbin@...il.com,
maxime.chevallier@...tlin.com,
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pabeni@...hat.com,
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rdunlap@...radead.org,
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saeed@...nel.org,
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Subject: [PATCH RFC v2 1/6] ethtool: add interface to read Tx hardware timestamping statistics
Multiple network devices that support hardware timestamping appear to have
common behavior with regards to timestamp handling. Implement common Tx
hardware timestamping statistics in a tx_stats struct_group. Common Rx
hardware timestamping statistics can subsequently be implemented in a
rx_stats struct_group for ethtool_ts_stats.
Signed-off-by: Rahul Rameshbabu <rrameshbabu@...dia.com>
---
Documentation/netlink/specs/ethtool.yaml | 20 +++++++++
include/linux/ethtool.h | 21 ++++++++++
include/uapi/linux/ethtool_netlink.h | 15 +++++++
net/ethtool/tsinfo.c | 52 +++++++++++++++++++++++-
4 files changed, 107 insertions(+), 1 deletion(-)
diff --git a/Documentation/netlink/specs/ethtool.yaml b/Documentation/netlink/specs/ethtool.yaml
index 197208f419dc..f99b003c78c0 100644
--- a/Documentation/netlink/specs/ethtool.yaml
+++ b/Documentation/netlink/specs/ethtool.yaml
@@ -559,6 +559,21 @@ attribute-sets:
-
name: tx-lpi-timer
type: u32
+ -
+ name: ts-stat
+ attributes:
+ -
+ name: pad
+ type: pad
+ -
+ name: tx-pkts
+ type: u64
+ -
+ name: tx-lost
+ type: u64
+ -
+ name: tx-err
+ type: u64
-
name: tsinfo
attributes:
@@ -581,6 +596,10 @@ attribute-sets:
-
name: phc-index
type: u32
+ -
+ name: stats
+ type: nest
+ nested-attributes: ts-stat
-
name: cable-result
attributes:
@@ -1388,6 +1407,7 @@ operations:
- tx-types
- rx-filters
- phc-index
+ - stats
dump: *tsinfo-get-op
-
name: cable-test-act
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index b90c33607594..a1704938a6fb 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -483,6 +483,24 @@ struct ethtool_rmon_stats {
);
};
+/**
+ * struct ethtool_ts_stats - HW timestamping statistics
+ * @tx_stats: struct group for TX HW timestamping
+ * @pkts: Number of packets successfully timestamped by the queried
+ * layer.
+ * @lost: Number of packet timestamps that failed to get applied on a
+ * packet by the queried layer.
+ * @err: Number of timestamping errors that occurred on the queried
+ * layer.
+ */
+struct ethtool_ts_stats {
+ struct_group(tx_stats,
+ u64 pkts;
+ u64 lost;
+ u64 err;
+ );
+};
+
#define ETH_MODULE_EEPROM_PAGE_LEN 128
#define ETH_MODULE_MAX_I2C_ADDRESS 0x7f
@@ -759,6 +777,7 @@ struct ethtool_rxfh_param {
* It may be called with RCU, or rtnl or reference on the device.
* Drivers supporting transmit time stamps in software should set this to
* ethtool_op_get_ts_info().
+ * @get_ts_stats: Query the device hardware timestamping statistics.
* @get_module_info: Get the size and type of the eeprom contained within
* a plug-in module.
* @get_module_eeprom: Get the eeprom information from the plug-in module
@@ -901,6 +920,8 @@ struct ethtool_ops {
struct ethtool_dump *, void *);
int (*set_dump)(struct net_device *, struct ethtool_dump *);
int (*get_ts_info)(struct net_device *, struct ethtool_ts_info *);
+ void (*get_ts_stats)(struct net_device *dev,
+ struct ethtool_ts_stats *ts_stats);
int (*get_module_info)(struct net_device *,
struct ethtool_modinfo *);
int (*get_module_eeprom)(struct net_device *,
diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index 3f89074aa06c..046a78d9421d 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -478,12 +478,27 @@ enum {
ETHTOOL_A_TSINFO_TX_TYPES, /* bitset */
ETHTOOL_A_TSINFO_RX_FILTERS, /* bitset */
ETHTOOL_A_TSINFO_PHC_INDEX, /* u32 */
+ ETHTOOL_A_TSINFO_STATS, /* nest - _A_TSINFO_STAT */
/* add new constants above here */
__ETHTOOL_A_TSINFO_CNT,
ETHTOOL_A_TSINFO_MAX = (__ETHTOOL_A_TSINFO_CNT - 1)
};
+enum {
+ ETHTOOL_A_TS_STAT_UNSPEC,
+ ETHTOOL_A_TS_STAT_PAD,
+
+ ETHTOOL_A_TS_STAT_TX_PKT, /* array, u64 */
+ ETHTOOL_A_TS_STAT_TX_LOST, /* array, u64 */
+ ETHTOOL_A_TS_STAT_TX_ERR, /* array, u64 */
+
+ /* add new constants above here */
+ __ETHTOOL_A_TS_STAT_CNT,
+ ETHTOOL_A_TS_STAT_MAX = (__ETHTOOL_A_TS_STAT_CNT - 1)
+
+};
+
/* PHC VCLOCKS */
enum {
diff --git a/net/ethtool/tsinfo.c b/net/ethtool/tsinfo.c
index 9daed0aab162..0d1370ded122 100644
--- a/net/ethtool/tsinfo.c
+++ b/net/ethtool/tsinfo.c
@@ -13,14 +13,18 @@ struct tsinfo_req_info {
struct tsinfo_reply_data {
struct ethnl_reply_data base;
struct ethtool_ts_info ts_info;
+ struct ethtool_ts_stats stats;
};
#define TSINFO_REPDATA(__reply_base) \
container_of(__reply_base, struct tsinfo_reply_data, base)
+#define ETHTOOL_TS_STAT_CNT \
+ (__ETHTOOL_A_TS_STAT_CNT - (ETHTOOL_A_TS_STAT_PAD + 1))
+
const struct nla_policy ethnl_tsinfo_get_policy[] = {
[ETHTOOL_A_TSINFO_HEADER] =
- NLA_POLICY_NESTED(ethnl_header_policy),
+ NLA_POLICY_NESTED(ethnl_header_policy_stats),
};
static int tsinfo_prepare_data(const struct ethnl_req_info *req_base,
@@ -34,6 +38,12 @@ static int tsinfo_prepare_data(const struct ethnl_req_info *req_base,
ret = ethnl_ops_begin(dev);
if (ret < 0)
return ret;
+ if (req_base->flags & ETHTOOL_FLAG_STATS &&
+ dev->ethtool_ops->get_ts_stats) {
+ ethtool_stats_init((u64 *)&data->stats,
+ sizeof(data->stats) / sizeof(u64));
+ dev->ethtool_ops->get_ts_stats(dev, &data->stats);
+ }
ret = __ethtool_get_ts_info(dev, &data->ts_info);
ethnl_ops_complete(dev);
@@ -79,10 +89,47 @@ static int tsinfo_reply_size(const struct ethnl_req_info *req_base,
}
if (ts_info->phc_index >= 0)
len += nla_total_size(sizeof(u32)); /* _TSINFO_PHC_INDEX */
+ if (req_base->flags & ETHTOOL_FLAG_STATS)
+ len += nla_total_size(0) + /* _TSINFO_STATS */
+ nla_total_size_64bit(sizeof(u64)) * ETHTOOL_TS_STAT_CNT;
return len;
}
+static int tsinfo_put_stat(struct sk_buff *skb, u64 val, u16 attrtype)
+{
+ if (val == ETHTOOL_STAT_NOT_SET)
+ return 0;
+ if (nla_put_u64_64bit(skb, attrtype, val, ETHTOOL_A_TS_STAT_PAD))
+ return -EMSGSIZE;
+ return 0;
+}
+
+static int tsinfo_put_stats(struct sk_buff *skb,
+ const struct ethtool_ts_stats *stats)
+{
+ struct nlattr *nest;
+
+ nest = nla_nest_start(skb, ETHTOOL_A_TSINFO_STATS);
+ if (!nest)
+ return -EMSGSIZE;
+
+ if (tsinfo_put_stat(skb, stats->tx_stats.pkts,
+ ETHTOOL_A_TS_STAT_TX_PKT) ||
+ tsinfo_put_stat(skb, stats->tx_stats.lost,
+ ETHTOOL_A_TS_STAT_TX_LOST) ||
+ tsinfo_put_stat(skb, stats->tx_stats.err,
+ ETHTOOL_A_TS_STAT_TX_ERR))
+ goto err_cancel;
+
+ nla_nest_end(skb, nest);
+ return 0;
+
+err_cancel:
+ nla_nest_cancel(skb, nest);
+ return -EMSGSIZE;
+}
+
static int tsinfo_fill_reply(struct sk_buff *skb,
const struct ethnl_req_info *req_base,
const struct ethnl_reply_data *reply_base)
@@ -119,6 +166,9 @@ static int tsinfo_fill_reply(struct sk_buff *skb,
if (ts_info->phc_index >= 0 &&
nla_put_u32(skb, ETHTOOL_A_TSINFO_PHC_INDEX, ts_info->phc_index))
return -EMSGSIZE;
+ if (req_base->flags & ETHTOOL_FLAG_STATS &&
+ tsinfo_put_stats(skb, &data->stats))
+ return -EMSGSIZE;
return 0;
}
--
2.42.0
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