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Date: Wed, 24 Jun 2020 11:19:17 +0300
From: Ido Schimmel <idosch@...sch.org>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, jiri@...lanox.com,
petrm@...lanox.com, amitc@...lanox.com, mlxsw@...lanox.com,
mkubecek@...e.cz, jacob.e.keller@...el.com, andrew@...n.ch,
f.fainelli@...il.com, linux@...pel-privat.de,
Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 04/10] Documentation: networking: ethtool-netlink: Add link extended state
From: Amit Cohen <amitc@...lanox.com>
Add link extended state attributes.
Signed-off-by: Amit Cohen <amitc@...lanox.com>
Reviewed-by: Petr Machata <petrm@...lanox.com>
Reviewed-by: Jiri Pirko <jiri@...lanox.com>
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
Documentation/networking/ethtool-netlink.rst | 110 ++++++++++++++++++-
1 file changed, 106 insertions(+), 4 deletions(-)
diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index 82470c36c27a..a7cc53f905f5 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -443,10 +443,11 @@ supports.
LINKSTATE_GET
=============
-Requests link state information. At the moment, only link up/down flag (as
-provided by ``ETHTOOL_GLINK`` ioctl command) is provided but some future
-extensions are planned (e.g. link down reason). This request does not have any
-attributes.
+Requests link state information. Link up/down flag (as provided by
+``ETHTOOL_GLINK`` ioctl command) is provided. Optionally, extended state might
+be provided as well. In general, extended state describes reasons for why a port
+is down, or why it operates in some non-obvious mode. This request does not have
+any attributes.
Request contents:
@@ -461,16 +462,117 @@ Kernel response contents:
``ETHTOOL_A_LINKSTATE_LINK`` bool link state (up/down)
``ETHTOOL_A_LINKSTATE_SQI`` u32 Current Signal Quality Index
``ETHTOOL_A_LINKSTATE_SQI_MAX`` u32 Max support SQI value
+ ``ETHTOOL_A_LINKSTATE_EXT_STATE`` u8 link extended state
+ ``ETHTOOL_A_LINKSTATE_EXT_SUBSTATE`` u8 link extended substate
==================================== ====== ============================
For most NIC drivers, the value of ``ETHTOOL_A_LINKSTATE_LINK`` returns
carrier flag provided by ``netif_carrier_ok()`` but there are drivers which
define their own handler.
+``ETHTOOL_A_LINKSTATE_EXT_STATE`` and ``ETHTOOL_A_LINKSTATE_EXT_SUBSTATE`` are
+optional values. ethtool core can provide either both
+``ETHTOOL_A_LINKSTATE_EXT_STATE`` and ``ETHTOOL_A_LINKSTATE_EXT_SUBSTATE``,
+or only ``ETHTOOL_A_LINKSTATE_EXT_STATE``, or none of them.
+
``LINKSTATE_GET`` allows dump requests (kernel returns reply messages for all
devices supporting the request).
+Link extended states:
+
+ ============================ =============================================
+ ``Autoneg`` States relating to the autonegotiation or
+ issues therein
+
+ ``Link training failure`` Failure during link training
+
+ ``Link logical mismatch`` Logical mismatch in physical coding sublayer
+ or forward error correction sublayer
+
+ ``Bad signal integrity`` Signal integrity issues
+
+ ``No cable`` No cable connected
+
+ ``Cable issue`` Failure is related to cable,
+ e.g., unsupported cable
+
+ ``EEPROM issue`` Failure is related to EEPROM, e.g., failure
+ during reading or parsing the data
+
+ ``Calibration failure`` Failure during calibration algorithm
+
+ ``Power budget exceeded`` The hardware is not able to provide the
+ power required from cable or module
+
+ ``Overheat`` The module is overheated
+ ============================ =============================================
+
+Link extended substates:
+
+ Autoneg substates:
+
+ ============================================== =============================================
+ ``No partner detected`` Peer side is down
+
+ ``Ack not received`` Ack not received from peer side
+
+ ``Next page exchange failed`` Next page exchange failed
+
+ ``No partner detected during force mode`` Peer side is down during force mode or there
+ is no agreement of speed
+
+ ``FEC mismatch during override`` Forward error correction modes in both sides
+ are mismatched
+
+ ``No HCD`` No Highest Common Denominator
+ ============================================== =============================================
+
+ Link training substates:
+
+ ============================================== =============================================
+ ``KR frame lock not acquired`` Frames were not recognized, the lock failed
+
+ ``KR link inhibit timeout`` The lock did not occur before timeout
+
+ ``KR Link partner did not set receiver ready`` Peer side did not send ready signal after
+ training process
+
+ ``Remote side is not ready yet`` Remote side is not ready yet
+
+ ============================================== =============================================
+
+ Link logical mismatch substates:
+
+ ============================================== =============================================
+ ``PCS did not acquire block lock`` Physical coding sublayer was not locked in
+ first phase - block lock
+
+ ``PCS did not acquire AM lock`` Physical coding sublayer was not locked in
+ second phase - alignment markers lock
+
+ ``PCS did not get align_status`` Physical coding sublayer did not get align
+ status
+
+ ``FC FEC is not locked`` FC forward error correction is not locked
+
+ ``RS FEC is not locked`` RS forward error correction is not locked
+ ============================================== =============================================
+
+ Bad signal integrity substates:
+
+ ============================================== =============================================
+ ``Large number of physical errors`` Large number of physical errors
+
+ ``Unsupported rate`` The system attempted to operate the cable at
+ a rate that is not formally supported, which
+ led to signal integrity issues
+
+ ``Unsupported cable`` Unsupported cable
+
+ ``Cable test failure`` Cable test failure
+ ============================================== =============================================
+
DEBUG_GET
=========
--
2.26.2
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