You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
55 lines
2.2 KiB
55 lines
2.2 KiB
IP OVER INFINIBAND
|
|
|
|
The ib_ipoib driver is an implementation of the IP over InfiniBand
|
|
protocol as specified by the latest Internet-Drafts issued by the
|
|
IETF ipoib working group. It is a "native" implementation in the
|
|
sense of setting the interface type to ARPHRD_INFINIBAND and the
|
|
hardware address length to 20 (earlier proprietary implementations
|
|
masqueraded to the kernel as ethernet interfaces).
|
|
|
|
Partitions and P_Keys
|
|
|
|
When the IPoIB driver is loaded, it creates one interface for each
|
|
port using the P_Key at index 0. To create an interface with a
|
|
different P_Key, write the desired P_Key into the main interface's
|
|
/sys/class/net/<intf name>/create_child file. For example:
|
|
|
|
echo 0x8001 > /sys/class/net/ib0/create_child
|
|
|
|
This will create an interface named ib0.8001 with P_Key 0x8001. To
|
|
remove a subinterface, use the "delete_child" file:
|
|
|
|
echo 0x8001 > /sys/class/net/ib0/delete_child
|
|
|
|
The P_Key for any interface is given by the "pkey" file, and the
|
|
main interface for a subinterface is in "parent."
|
|
|
|
Debugging Information
|
|
|
|
By compiling the IPoIB driver with CONFIG_INFINIBAND_IPOIB_DEBUG set
|
|
to 'y', tracing messages are compiled into the driver. They are
|
|
turned on by setting the module parameters debug_level and
|
|
mcast_debug_level to 1. These parameters can be controlled at
|
|
runtime through files in /sys/module/ib_ipoib/.
|
|
|
|
CONFIG_INFINIBAND_IPOIB_DEBUG also enables files in the debugfs
|
|
virtual filesystem. By mounting this filesystem, for example with
|
|
|
|
mount -t debugfs none /sys/kernel/debug
|
|
|
|
it is possible to get statistics about multicast groups from the
|
|
files /sys/kernel/debug/ipoib/ib0_mcg and so on.
|
|
|
|
The performance impact of this option is negligible, so it
|
|
is safe to enable this option with debug_level set to 0 for normal
|
|
operation.
|
|
|
|
CONFIG_INFINIBAND_IPOIB_DEBUG_DATA enables even more debug output in
|
|
the data path when data_debug_level is set to 1. However, even with
|
|
the output disabled, enabling this configuration option will affect
|
|
performance, because it adds tests to the fast path.
|
|
|
|
References
|
|
|
|
IETF IP over InfiniBand (ipoib) Working Group
|
|
http://ietf.org/html.charters/ipoib-charter.html
|
|
|