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NetXtreme II User Guide
January 2010
Broadcom Corporation
Page 130 Setting Values for Optional Properties Document ENGSRVT52-CDUM100-R
BNX2I DRIVER
Optional parameters en_tcp_dack, error_mask1, and error_mask2 can be supplied as command line arguments to the
insmod or modprobe command for bnx2i.
error_mask1 and error_mask2
"Config FW iSCSI Error Mask #", use to configure certain iSCSI protocol violation to be treated either as a warning or a fatal
error. All fatal iSCSI protocol violations will result in session recovery (ERL 0). These are bit masks.
Defaults: All violations will be treated as errors.
CAUTION! Do not use error_mask if you are not sure about the consequences. These values are to be discussed with
Broadcom development team on a case-by-case basis. This is just a mechanism to work around iSCSI implementation
issues on the target side and without proper knowledge of iSCSI protocol details, users are advised not to experiment with
these parameters.
en_tcp_dack
"Enable TCP Delayed ACK", enables/disables TCP delayed ACK feature on offloaded iSCSI connections.
Defaults: TCP delayed ACK is ENABLED. For example:
insmod bnx2i.ko en_tcp_dack=0
or
modprobe bnx2i en_tcp_dack=0
sq_size
"Configure SQ size", used to choose send queue size for offloaded connections and SQ size determines the maximum SCSI
commands that can be queued. SQ size also has a bearing on the number of connections that can be offloaded; as QP size
increases, the number of connections supported will decrease. With the default values, the BCM5706/BCM5708 adapter
can offload 28 connections.
Defaults: 128
Range: 32 to 128
Note that Broadcom validation is limited to a power of 2; for example, 32, 64, 128.
rq_size
“Configure RQ size”, used to choose the size of asynchronous buffer queue size per offloaded connections. RQ size is not
required greater than 16 as it is used to place iSCSI ASYNC/NOP/REJECT messages and SCSI sense data.
Defaults: 16
Range: 16 to 32