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authorMichal Kubecek <mkubecek@suse.cz>2020-03-12 21:08:38 +0100
committerDavid S. Miller <davem@davemloft.net>2020-03-12 15:32:33 -0700
commit0c84979c951a85fcb5c77ac2480fd476e283a07c (patch)
tree83256438a6a5aeb2658d6e52b9b154fd1785e741 /Documentation/networking
parentbc9d1c995ecb8cccaac8ead2ed570544c2c885eb (diff)
ethtool: provide channel counts with CHANNELS_GET request
Implement CHANNELS_GET request to get channel counts of a network device. These are traditionally available via ETHTOOL_GCHANNELS ioctl request. Omit attributes for channel types which are not supported by driver or device (zero reported for maximum). v2: (all suggested by Jakub Kicinski) - minor cleanup in channels_prepare_data() - more descriptive channels_reply_size() - omit attributes with zero max count Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
-rw-r--r--Documentation/networking/ethtool-netlink.rst30
1 files changed, 29 insertions, 1 deletions
diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index 026a5fd4a08b..decbbddfd8be 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -195,6 +195,7 @@ Userspace to kernel:
``ETHTOOL_MSG_PRIVFLAGS_SET`` set private flags
``ETHTOOL_MSG_RINGS_GET`` get ring sizes
``ETHTOOL_MSG_RINGS_SET`` set ring sizes
+ ``ETHTOOL_MSG_CHANNELS_GET`` get channel counts
===================================== ================================
Kernel to userspace:
@@ -217,6 +218,7 @@ Kernel to userspace:
``ETHTOOL_MSG_PRIVFLAGS_NTF`` private flags
``ETHTOOL_MSG_RINGS_GET_REPLY`` ring sizes
``ETHTOOL_MSG_RINGS_NTF`` ring sizes
+ ``ETHTOOL_MSG_CHANNELS_GET_REPLY`` channel counts
===================================== =================================
``GET`` requests are sent by userspace applications to retrieve device
@@ -695,6 +697,32 @@ driver. Driver may impose additional constraints and may not suspport all
attributes.
+CHANNELS_GET
+============
+
+Gets channel counts like ``ETHTOOL_GCHANNELS`` ioctl request.
+
+Request contents:
+
+ ==================================== ====== ==========================
+ ``ETHTOOL_A_CHANNELS_HEADER`` nested request header
+ ==================================== ====== ==========================
+
+Kernel response contents:
+
+ ===================================== ====== ==========================
+ ``ETHTOOL_A_CHANNELS_HEADER`` nested reply header
+ ``ETHTOOL_A_CHANNELS_RX_MAX`` u32 max receive channels
+ ``ETHTOOL_A_CHANNELS_TX_MAX`` u32 max transmit channels
+ ``ETHTOOL_A_CHANNELS_OTHER_MAX`` u32 max other channels
+ ``ETHTOOL_A_CHANNELS_COMBINED_MAX`` u32 max combined channels
+ ``ETHTOOL_A_CHANNELS_RX_COUNT`` u32 receive channel count
+ ``ETHTOOL_A_CHANNELS_TX_COUNT`` u32 transmit channel count
+ ``ETHTOOL_A_CHANNELS_OTHER_COUNT`` u32 other channel count
+ ``ETHTOOL_A_CHANNELS_COMBINED_COUNT`` u32 combined channel count
+ ===================================== ====== ==========================
+
+
Request translation
===================
@@ -765,7 +793,7 @@ have their netlink replacement yet.
``ETHTOOL_SRXFHINDIR`` n/a
``ETHTOOL_GFEATURES`` ``ETHTOOL_MSG_FEATURES_GET``
``ETHTOOL_SFEATURES`` ``ETHTOOL_MSG_FEATURES_SET``
- ``ETHTOOL_GCHANNELS`` n/a
+ ``ETHTOOL_GCHANNELS`` ``ETHTOOL_MSG_CHANNELS_GET``
``ETHTOOL_SCHANNELS`` n/a
``ETHTOOL_SET_DUMP`` n/a
``ETHTOOL_GET_DUMP_FLAG`` n/a