ibd(7D) Devices ibd(7D)
NAME
ibd - Infiniband IPoIB device driver
SYNOPSIS
/dev/ibd*
DESCRIPTION
The ibd driver implements the IETF IP over Infiniband protocol and provides IPoIB service for all IBA ports present in the system.
The ibd driver is a multi-threaded, loadable, clonable, STREAMS hardware driver supporting the connectionless Data Link Provider Interface,
dlpi(7P)). The ibd driver provides basic support for the IBA Unreliable Datagram Queue Pair hardware. Functions include QP initialization,
frame transmit and receive, multicast and promiscuous mode support, and statistics reporting.
Use the cloning, character-special device /dev/ibd to access all ibd devices installed within the system.
The ibd driver is dependent on GLD, a loadable kernel module that provides the ibd driver with the DLPI and STREAMS functionality required
of a LAN driver. Except as noted in the Application Programming Interface section of this manpage, see gld(7D) for more details on the
primitives supported by the driver. The GLD module is located at /kernel/misc/sparcv9/gld on 64 bit systems and at /kernel/misc/gld on 32
bit systems.
The ibd driver expects certain configuration of the IBA fabric prior to operation (which also implies the SM must be active and managing
the fabric). Specifically, the IBA multicast group representing the IPv4 limited broadcast address 255.255.255.255 (also defined as broad-
cast-GID in IETF documents) must be created prior to initializing the device. IBA properties (including mtu, qkey and sl) of this group is
used by the driver to create any other IBA multicast group as instructed by higher level (IP) software. The driver probes for the existance
of this broadcast-GID during attach(9E).
APPLICATION PROGRAMMING INTERFACE (DLPI)
The values returned by the driver in the DL_INFO_ACK primitive in response to your DL_INFO_REQ are:
o Maximum SDU is the MTU associated with the broadcast-GID group, less the 4 byte IPoIB header.
o Minimum SDU is 0.
o dlsap address length is 22.
o MAC type is DL_IB.
o The sap length value is -2, meaning the physical address component is followed immediately by a 2-byte sap component within the DLSAP
address.
o Broadcast address value is the MAC address consisting of the 4 bytes of QPN 00:FF:FF:FF prepended to the IBA multicast address of the
broadcast-GID.
Due to the nature of link address definition for IPoIB, the DL_SET_PHYS_ADDR_REQ DLPI primitive is not supported.
In the transmit case for streams that have been put in raw mode via the DLIOCRAW ioctl, the DLPI application must prepend the 20 byte
IPoIB destination address to the data it wants to transmit over-the-wire. In the receive case, applications receive the IP/ARP data-
gram along with the IETF defined 4 byte header.
WARNING
This section describes warning messages that might be generated by the driver. Please note that while the format of these messages may be
modified in future versions, the same general information will be provided.
While joining IBA multicast groups corresponding to IP multicast groups as part of multicast promiscuous operations as required by IP mul-
ticast routers, or as part of running snoop(1M), it is possible that joins to some multicast groups can fail due to inherent resource con-
straints in the IBA components. In such cases, warning message similar to the following appear in the system log, indicating the interface
on which the failure occurred:
NOTICE: ibd0: Could not get list of IBA multicast groups
NOTICE: ibd0: IBA promiscuous mode missed multicast group
NOTICE: ibd0: IBA promiscuous mode missed new multicast gid
Also, if the IBA SM indicates that multicast trap support is suspended or unavailable, the system log contains a message similar to:
NOTICE: ibd0: IBA multicast support degraded due to
unavailability of multicast traps
And when the SM indicates trap support is restored:
NOTICE: ibd0: IBA multicast support restored due to
availability of multicast traps
Additionally, if the IBA link transitions to an unavailable state (that is, the IBA link state becomes "Down," "Initialize" or "Armed") and
then becomes active again, the driver tries to rejoin previously joined groups if required. Failure to rejoin multicast groups will trigger
messages like:
NOTICE: ibd0: Failure on port up to rejoin multicast gid
If the corresponding HCA port is in the unavailable state defined above when initializing an ibd interface using ifconfig(1M), a message is
emitted by the driver:
NOTICE: ibd0: Port is not active
Further, as described above, if the broadcast-GID is not found, or the associated MTU is higher than what the HCA port can support, the
following messages are printed to the system log:
NOTICE: ibd0: IPoIB broadcast group absent
NOTICE: ibd0: IPoIB broadcast group MTU 4096 greater than port's
maximum MTU 2048
In all cases of these reported problems when running ifconfig(1M), it should be checked that IBA cabling is intact, an SM is running on the
fabric, and the broadcast-GID with appropriate properties has been created in the IBA partition.
CONFIGURATION
The IPoIB service comes preconfigured on all HCA ports in the system. To turn the service off, or back on after turning it off, refer to
documentation in cfgadm_ib(1M).
FILES
/dev/ibd*
special character device
/kernel/drv/ib.conf
configuration file to start IPoIB service
/kernel/drv/sparcv9/ibd
64-bit SPARC device driver
/kernel/drv/amd64/ibd
64-bit x86 device driver
/kernel/drv/ibd
32-bit x86 device driver
SEE ALSO
cfgadm(1M), cfgadm_ib(1M), ifconfig(1M), syslogd(1M), gld(7D), ib(7D), kstat(7D), streamio(7I), dlpi(7P), attributes(5), attach(9E)
SunOS 5.10 9 Oct 2004 ibd(7D)