Merge tag 'docs-5.15' of git://git.lwn.net/linux

[linux-2.6-microblaze.git] / Documentation / networking / ethtool-netlink.rst

diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index c86628e..d9b55b7 100644 (file)
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -595,6 +595,14 @@ Link extended substates:
                                                                        that is not formally
                                                                        supported, which led to
                                                                        signal integrity issues
+
+  ``ETHTOOL_LINK_EXT_SUBSTATE_BSI_SERDES_REFERENCE_CLOCK_LOST``        The external clock signal for
+                                                                       SerDes is too weak or
+                                                                       unavailable.
+
+  ``ETHTOOL_LINK_EXT_SUBSTATE_BSI_SERDES_ALOS``                        The received signal for
+                                                                       SerDes is too weak because
+                                                                       analog loss of signal.
   =================================================================    =============================
 
   Cable issue substates:
@@ -939,12 +947,25 @@ Kernel response contents:
   ``ETHTOOL_A_COALESCE_TX_USECS_HIGH``         u32     delay (us), high Tx
   ``ETHTOOL_A_COALESCE_TX_MAX_FRAMES_HIGH``    u32     max packets, high Tx
   ``ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL``  u32     rate sampling interval
+  ``ETHTOOL_A_COALESCE_USE_CQE_TX``            bool    timer reset mode, Tx
+  ``ETHTOOL_A_COALESCE_USE_CQE_RX``            bool    timer reset mode, Rx
   ===========================================  ======  =======================
 
 Attributes are only included in reply if their value is not zero or the
 corresponding bit in ``ethtool_ops::supported_coalesce_params`` is set (i.e.
 they are declared as supported by driver).
 
+Timer reset mode (``ETHTOOL_A_COALESCE_USE_CQE_TX`` and
+``ETHTOOL_A_COALESCE_USE_CQE_RX``) controls the interaction between packet
+arrival and the various time based delay parameters. By default timers are
+expected to limit the max delay between any packet arrival/departure and a
+corresponding interrupt. In this mode timer should be started by packet
+arrival (sometimes delivery of previous interrupt) and reset when interrupt
+is delivered.
+Setting the appropriate attribute to 1 will enable ``CQE`` mode, where
+each packet event resets the timer. In this mode timer is used to force
+the interrupt if queue goes idle, while busy queues depend on the packet
+limit to trigger interrupts.
 
 COALESCE_SET
 ============
@@ -977,6 +998,8 @@ Request contents:
   ``ETHTOOL_A_COALESCE_TX_USECS_HIGH``         u32     delay (us), high Tx
   ``ETHTOOL_A_COALESCE_TX_MAX_FRAMES_HIGH``    u32     max packets, high Tx
   ``ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL``  u32     rate sampling interval
+  ``ETHTOOL_A_COALESCE_USE_CQE_TX``            bool    timer reset mode, Tx
+  ``ETHTOOL_A_COALESCE_USE_CQE_RX``            bool    timer reset mode, Rx
   ===========================================  ======  =======================
 
 Request is rejected if it attributes declared as unsupported by driver (i.e.