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Date: Wed, 14 Apr 2021 13:23:21 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, andrew@...n.ch, mkubecek@...e.cz,
idosch@...dia.com, Jakub Kicinski <kuba@...nel.org>
Subject: [RFC net-next 2/6] docs: ethtool: document standard statistics
Add documentation for ETHTOOL_MSG_STATS_GET.
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
Documentation/networking/ethtool-netlink.rst | 74 ++++++++++++++++++++
1 file changed, 74 insertions(+)
diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index f8219e2f489e..086a80eb17be 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -210,6 +210,7 @@ All constants identifying message types use ``ETHTOOL_CMD_`` prefix and suffix
``ETHTOOL_MSG_TUNNEL_INFO_GET`` get tunnel offload info
``ETHTOOL_MSG_FEC_GET`` get FEC settings
``ETHTOOL_MSG_FEC_SET`` set FEC settings
+ ``ETHTOOL_MSG_STATS_GET`` get standard statistics
===================================== ================================
Kernel to userspace:
@@ -246,6 +247,7 @@ All constants identifying message types use ``ETHTOOL_CMD_`` prefix and suffix
``ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY`` tunnel offload info
``ETHTOOL_MSG_FEC_GET_REPLY`` FEC settings
``ETHTOOL_MSG_FEC_NTF`` FEC settings
+ ``ETHTOOL_MSG_STATS_GET_REPLY`` standard statistics
===================================== =================================
``GET`` requests are sent by userspace applications to retrieve device
@@ -1391,6 +1393,78 @@ accessible.
``ETHTOOL_A_MODULE_EEPROM_DATA`` has an attribute length equal to the amount of
bytes driver actually read.
+STATS_GET
+=========
+
+Get standard statistics for the interface. Note that this is not
+a re-implementation of ``ETHTOOL_GSTATS`` which exposed driver-defined
+stats.
+
+Request contents:
+
+ ======================================= ====== ==========================
+ ``ETHTOOL_A_STATS_HEADER`` nested request header
+ ``ETHTOOL_A_STATS_GROUPS`` bitset requested groups of stats
+ ======================================= ====== ==========================
+
+Kernel response contents:
+
+ +---------------------------------+--------+----------------------------------+
+ | ``ETHTOOL_A_STATS_HEADER`` | nested | reply header |
+ +---------------------------------+--------+----------------------------------+
+ | ``ETHTOOL_A_STATS_GRP`` | nested | one or more groups of statistics |
+ +-+-------------------------------+--------+----------------------------------+
+ | | ``ETHTOOL_A_STATS_GRP_ID`` | u32 | group ID - ``ETHTOOL_STATS_*`` |
+ +-+-------------------------------+--------+----------------------------------+
+ | | ``ETHTOOL_A_STATS_GRP_SS_ID`` | u32 | string set ID for names |
+ +-+-------------------------------+--------+----------------------------------+
+ | | ``ETHTOOL_A_STATS_*`` | u64 | actual statistics |
+ +-+-------------------------------+--------+----------------------------------+
+
+Users specify which groups of statistics they are requesting via
+the ``ETHTOOL_A_STATS_GROUPS`` bitset. Currently defined values are:
+
+ ====================== ======== ===============================================
+ ETHTOOL_STATS_ETH_MAC eth-mac Basic IEEE 802.3 MAC statistics (30.3.1.1.*)
+ ETHTOOL_STATS_ETH_PHY eth-phy Basic IEEE 802.3 PHY statistics (30.3.2.1.*)
+ ETHTOOL_STATS_ETH_CTRL eth-ctrl Basic IEEE 802.3 MAC Ctrl statistics (30.3.3.*)
+ ETHTOOL_STATS_RMON rmon RMON (RFC 2819) statistics
+ ====================== ======== ===============================================
+
+Each group should have a corresponding ``ETHTOOL_A_STATS_GRP`` in the reply.
+``ETHTOOL_A_STATS_GRP_ID`` identifies which group's statistics nest contains.
+``ETHTOOL_A_STATS_GRP_SS_ID`` identifies the string set ID for the names of
+the statistics in the group, if available.
+
+Statistics are added directly to the ``ETHTOOL_A_STATS_GRP`` nest. Each group
+has its own interpretation of attribute IDs above
+``ETHTOOL_A_STATS_GRP_FIRST_ATTR``. Attribute IDs correspond to strings from
+the string set identified by ``ETHTOOL_A_STATS_GRP_SS_ID``. Complex statistics
+(such as RMON histogram entries) are also listed directly in
+``ETHTOOL_A_STATS_GRP`` and do not have a string defined in the string set.
+
+RMON "histogram" counters count number of packets within given size range.
+Because RFC does not specify the ranges beyond the standard 1518 MTU devices
+differ in definition of buckets. For this reason the definition of packet ranges
+is left to each driver.
+
+ ================================= ====== ===================================
+ ETHTOOL_A_STATS_RMON_HIST nested contains the attributes below
+ ETHTOOL_A_STATS_RMON_HIST_BKT_LOW u32 low bound of the packet size bucket
+ ETHTOOL_A_STATS_RMON_HIST_BKT_HI u32 high bound of the bucket
+ ETHTOOL_A_STATS_RMON_HIST_VAL u64 packet counter
+ ETHTOOL_A_STATS_RMON_HIST_TX nested same as HIST but counting Tx pkts
+ ================================= ====== ===================================
+
+Low and high bounds are inclusive, for example:
+
+ ============================= ==== ====
+ RFC statistic low high
+ ============================= ==== ====
+ etherStatsPkts64Octets 0 64
+ etherStatsPkts512to1023Octets 512 1023
+ ============================= ==== ====
+
Request translation
===================
--
2.30.2
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