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3. Configuration
Ethernet Driver Configuration
Support for Ethtool set/get-channels
The Ethtool get-channels command is available in kernel versions of RHEL 6.4,
SLES 11.2, and 3.0.x and higher.
The Ethtool get-channels command – “ethtool -l <ethx>” displays the following
information:


The current number of Rx/Tx/interrupt queue pairs (a “combined channel”)
created by the NIC function
The maximum number of channels supported by the NIC function
The Ethtool set-channels command - "ethtool -L <ethx> combined N" configures the
number of channels requested for the NIC function.
Notes




You can increase (up to the maximum supported limit) or decrease the number
of channels used by the NIC function.
The NIC driver supports only “combined” channels.
The maximum number of channels supported by an interface is also limited to
the number of cpu-cores in the server.
In older Linux distributions, use the sysfs interface as follows:

The maximum number of channels supported by NIC function:
cat /sys/class/net/<ethx>/max_qs

The current number of channels configured:
cat /sys/class/net/<ethx>/num_qs

To configure the 'N' number of channels requested for the NIC function:
echo N > /sys/class/net<ethx>/num_qs
Support for Ethtool set-dump
The Ethtool set-dump command is available in the kernel versions of RHEL 6.4, SLES
11.2, and 3.0.x and higher. It is supported only on LPe16000-series adapters.
The Ethtool set-dump command - "ethtool -W <ethx> N" can be used as follows:

To trigger a FW dump:
ethtool -W <ethx> 1

To delete an existing dump
ethtool -W <ethx> 2
Notes


An existing dump should be deleted first before triggering a new dump.
In older Linux distributions, use the sysfs interface as follows:

To trigger a FW dump:
# echo 1 > /sys/class/net/<ethx>/trigger_dump

To delete an existing dump:
# echo 1 > /sys/class/net/<ethx>/delete_dump
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