Dell Broadcom NetXtreme Family of Adapters User Manual page 33

By default, the open-iscsi daemon connects to discovered targets using software initiator (transport name = 'tcp'). Users who
wish to offload iSCSI connection onto CNIC device should explicitly change transport binding of the iSCSI node. This can be
done using iscsiadm cli utility as follows,
iscsiadm --mode node --targetname iqn.2004-06.com.broadcom:tg1 \
--portal 192.168.1.100 --op=update
--name=node.transport_name --value=${XPORT_NAME}
where XPORT_NAME=bcm570x-xxyyzz
xx - pci bus number of the NX2 device
yy - pci device number of the NX2 device
zz - pci function number of the NX2 device
Network interface to iscsi transport name binding can be obtained by executing the following.
dmesg | grep "bnx2i: netif"
Sample output in a system with two NetXtreme II devices:
bnx2i: netif=eth1, iscsi=bcm570x-050000
bnx2i: netif=eth0, iscsi=bcm570x-030000
If you wish to switch back to use the software initiator, use the following:
iscsiadm --mode node --targetname iqn.2004-06.com.broadcom:tg1 \
--portal 192.168.1.100 --op=update
--name=node.transport_name --value=tcp
Making Connections to iSCSI Targets
Refer to open-iscsi documentation for a comprehensive list of iscsiadm commands. This is a sample list of commands to
discovery targets and to create iscsi connections to a target.
Add static entry
iscsiadm -m node -p <ipaddr[:port]> -T iqn.2007-05.com.broadcom:target1 -o new
iSCSI target discovery using 'SendTargets'
iscsiadm -m discovery --type sendtargets -p <ipaddr[:port]>
Login to target using 'iscsiadm' command
iscsiadm --mode node --targetname <iqn.targetname> --portal <ipaddr[:port]> --login
List all drives active in the system
'fdisk -l'
Maximize Offload iSCSI Connections
With default driver parameters set, which includes 128 outstanding commands, bnx2i can offload a maximum of 28 iSCSI
connections. This is not a hard limit, but just a simple on-chip resource allocation math. bnx2i will be able to offload > 28
connections by reducing the shared queue size which in turn limits the maximum outstanding tasks on a connection. Driver
logs the following message to syslog when the maximum allowed connection offload limit is reached - "bnx2i: unable to
allocate iSCSI context resources"
Linux iSCSI Offload FAQ
Not all Broadcom NetXtreme II adapters support iSCSI offload.
The iSCSI session will not recover after a hot remove and hot plug.
The iSCSI driver/firmware will not offload iSCSI connections onto a jumbo frame-enabled CNIC device.
For MPIO to work properly, iSCSI nopout should be enabled on each iSCSI session. Refer to open-iscsi documentation
for procedures on setting up noop_out_interval and noop_out_timeout values.
In the scenario where multiple CNIC devices are in the system and the system is booted via Broadcom's iSCSI boot solution,
ensure that the iscsi node under /etc/iscsi/nodes for the boot target is bound to the NIC that is used for booting.
Please read all Restrictions and Disclaimers.
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