net: atlantic: loopback tests via private flags

[linux.git] / Documentation / networking / device_drivers / aquantia / atlantic.txt

diff --git a/Documentation/networking/device_drivers/aquantia/atlantic.txt b/Documentation/networking/device_drivers/aquantia/atlantic.txt
index d235cbaeccc65afb4675ec3b8f1109694f3854bb..cf3e88ca885e566085ef882869c47dc04d7a0b2e 100644 (file)
--- a/Documentation/networking/device_drivers/aquantia/atlantic.txt
+++ b/Documentation/networking/device_drivers/aquantia/atlantic.txt
@@ -325,6 +325,31 @@ Supported ethtool options
  Example:
  ethtool -N eth0 flow-type udp4 action 0 loc 32
 
+ Private flags (testing)
+ ---------------------------------
+
+ Atlantic driver supports private flags for hardware custom features:
+
+       $ ethtool --show-priv-flags ethX
+
+       Private flags for ethX:
+       DMASystemLoopback  : off
+       PKTSystemLoopback  : off
+       DMANetworkLoopback : off
+       PHYInternalLoopback: off
+       PHYExternalLoopback: off
+
+ Example:
+
+       $ ethtool --set-priv-flags ethX DMASystemLoopback on
+
+ DMASystemLoopback:   DMA Host loopback.
+ PKTSystemLoopback:   Packet buffer host loopback.
+ DMANetworkLoopback:  Network side loopback on DMA block.
+ PHYInternalLoopback: Internal loopback on Phy.
+ PHYExternalLoopback: External loopback on Phy (with loopback ethernet cable).
+
+
 Command Line Parameters
 =======================
 The following command line parameters are available on atlantic driver: