User Manual

Rev 2.1-1.0.6

Mellanox Technologies

ioc_guid A 16-digit hexadecimal number specifying the eight byte I/O controller

GUID portion of the 16-byte target port identifier.

dgid A 32-digit hexadecimal number specifying the destination GID.

pkey A four-digit hexadecimal number specifying the InfiniBand partition

key.

service_id A 16-digit hexadecimal number specifying the InfiniBand service ID

used to establish communication with the SRP target. How to find out

the value of the service ID is specified in the documentation of the SRP

target.

max_sect A decimal number specifying the maximum number of 512-byte sectors

to be transferred via a single SCSI command.

max_cmd_per_lun A decimal number specifying the maximum number of outstanding

commands for a single LUN.

io_class A hexadecimal number specifying the SRP I/O class. Must be either

0xff00 (rev 10) or 0x0100 (rev 16a). The I/O class defines the format of

the SRP initiator and target port identifiers.

initiator_ext A 16-digit hexadecimal number specifying the identifier extension por-

tion of the SRP initiator port identifier. This data is sent by the initiator

to the target in the SRP_LOGIN_REQ request.

cmd_sg_entries A number in the range 1..255 that specifies the maximum number of

data buffer descriptors stored in the SRP_CMD information unit itself.

With allow_ext_sg=0 the parameter cmd_sg_entries defines the maxi-

mum S/G list length for a single SRP_CMD, and commands whose S/G

list length exceeds this limit after S/G list collapsing will fail.

allow_ext_sg Whether ib_srp is allowed to include a partial memory descriptor list in

an SRP_CMD instead of the entire list. If a partial memory descriptor

list has been included in an SRP_CMD the remaining memory descrip-

tors are communicated from initiator to target via an additional RDMA

transfer. Setting allow_ext_sg to 1 increases the maximum amount of

data that can be transferred between initiator and target via a single

SCSI command. Since not all SRP target implementations support par-

tial memory descriptor lists the default value for this option is 0.

sg_tablesize A number in the range 1..2048 specifying the maximum S/G list length

the SCSI layer is allowed to pass to ib_srp. Specifying a value that

exceeds cmd_sg_entries is only safe with partial memory descriptor list

support enabled (allow_ext_sg=1).

comp_vector A number in the range 0..n-1 specifying the MSI-X completion vector.

Some HCA's allocate multiple (n) MSI-X vectors per HCA port. If the

IRQ affinity masks of these interrupts have been configured such that

each MSI-X interrupt is handled by a different CPU then the

comp_vector parameter can be used to spread the SRP completion

workload over multiple CPU's.