@@ -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 +1393,86 @@ 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 group of stats |
+ +-+---------------------------------+--------+--------------------------------+
+ | | ``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_GRP_STAT`` | nested | nest containing a statistic |
+ +-+---------------------------------+--------+--------------------------------+
+ | | ``ETHTOOL_A_STATS_GRP_HIST_RX`` | nested | histogram statistic (Rx) |
+ +-+---------------------------------+--------+--------------------------------+
+ | | ``ETHTOOL_A_STATS_GRP_HIST_TX`` | nested | histogram statistic (Tx) |
+ +-+---------------------------------+--------+--------------------------------+
+
+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 to the ``ETHTOOL_A_STATS_GRP`` nest under
+``ETHTOOL_A_STATS_GRP_STAT``. ``ETHTOOL_A_STATS_GRP_STAT`` should contain
+single 8 byte (u64) attribute inside - the type of that attribute is
+the statistic ID and the value is the value of the statistic.
+Each group has its own interpretation of statistic IDs.
+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 inside ``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_GRP_HIST_RX`` and ``ETHTOOL_A_STATS_GRP_HIST_TX`` nests
+contain the following attributes:
+
+ ================================= ====== ===================================
+ 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
+ ================================= ====== ===================================
+
+Low and high bounds are inclusive, for example:
+
+ ============================= ==== ====
+ RFC statistic low high
+ ============================= ==== ====
+ etherStatsPkts64Octets 0 64
+ etherStatsPkts512to1023Octets 512 1023
+ ============================= ==== ====
+
Request translation
===================
Add documentation for ETHTOOL_MSG_STATS_GET. Signed-off-by: Jakub Kicinski <kuba@kernel.org> --- Documentation/networking/ethtool-netlink.rst | 82 ++++++++++++++++++++ 1 file changed, 82 insertions(+)