What: /sys/class/infiniband_srp/srp--/add_target Date: January 2, 2006 KernelVersion: 2.6.15 Contact: linux-rdma@vger.kernel.org Description: Interface for making ib_srp connect to a new target. One can request ib_srp to connect to a new target by writing a comma-separated list of login parameters to this sysfs attribute. The supported parameters are: * id_ext, a 16-digit hexadecimal number specifying the eight byte identifier extension in the 16-byte SRP target port identifier. The target port identifier is sent by ib_srp to the target in the SRP_LOGIN_REQ request. * 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 portion 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 maximum 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 descriptors 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 partial 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 of the first RDMA channel. 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. * tl_retry_count, a number in the range 2..7 specifying the IB RC retry count. * queue_size, the maximum number of commands that the initiator is allowed to queue per SCSI host. The default value for this parameter is 62. The lowest supported value is 2. * max_it_iu_size, a decimal number specifying the maximum initiator to target information unit length. What: /sys/class/infiniband_srp/srp--/ibdev Date: January 2, 2006 KernelVersion: 2.6.15 Contact: linux-rdma@vger.kernel.org Description: HCA name (). What: /sys/class/infiniband_srp/srp--/port Date: January 2, 2006 KernelVersion: 2.6.15 Contact: linux-rdma@vger.kernel.org Description: HCA port number (). What: /sys/class/scsi_host/host/allow_ext_sg Date: May 19, 2011 KernelVersion: 2.6.39 Contact: linux-rdma@vger.kernel.org Description: Whether ib_srp is allowed to include a partial memory descriptor list in an SRP_CMD when communicating with an SRP target. What: /sys/class/scsi_host/host/ch_count Date: April 1, 2015 KernelVersion: 3.19 Contact: linux-rdma@vger.kernel.org Description: Number of RDMA channels used for communication with the SRP target. What: /sys/class/scsi_host/host/cmd_sg_entries Date: May 19, 2011 KernelVersion: 2.6.39 Contact: linux-rdma@vger.kernel.org Description: Maximum number of data buffer descriptors that may be sent to the target in a single SRP_CMD request. What: /sys/class/scsi_host/host/comp_vector Date: September 2, 2013 KernelVersion: 3.11 Contact: linux-rdma@vger.kernel.org Description: Completion vector used for the first RDMA channel. What: /sys/class/scsi_host/host/dgid Date: June 17, 2006 KernelVersion: 2.6.17 Contact: linux-rdma@vger.kernel.org Description: InfiniBand destination GID used for communication with the SRP target. Differs from orig_dgid if port redirection has happened. What: /sys/class/scsi_host/host/id_ext Date: June 17, 2006 KernelVersion: 2.6.17 Contact: linux-rdma@vger.kernel.org Description: Eight-byte identifier extension portion of the 16-byte target port identifier. What: /sys/class/scsi_host/host/ioc_guid Date: June 17, 2006 KernelVersion: 2.6.17 Contact: linux-rdma@vger.kernel.org Description: Eight-byte I/O controller GUID portion of the 16-byte target port identifier. What: /sys/class/scsi_host/host/local_ib_device Date: November 29, 2006 KernelVersion: 2.6.19 Contact: linux-rdma@vger.kernel.org Description: Name of the InfiniBand HCA used for communicating with the SRP target. What: /sys/class/scsi_host/host/local_ib_port Date: November 29, 2006 KernelVersion: 2.6.19 Contact: linux-rdma@vger.kernel.org Description: Number of the HCA port used for communicating with the SRP target. What: /sys/class/scsi_host/host/orig_dgid Date: June 17, 2006 KernelVersion: 2.6.17 Contact: linux-rdma@vger.kernel.org Description: InfiniBand destination GID specified in the parameters written to the add_target sysfs attribute. What: /sys/class/scsi_host/host/pkey Date: June 17, 2006 KernelVersion: 2.6.17 Contact: linux-rdma@vger.kernel.org Description: A 16-bit number representing the InfiniBand partition key used for communication with the SRP target. What: /sys/class/scsi_host/host/req_lim Date: October 20, 2010 KernelVersion: 2.6.36 Contact: linux-rdma@vger.kernel.org Description: Number of requests ib_srp can send to the target before it has to wait for more credits. For more information see also the SRP credit algorithm in the SRP specification. What: /sys/class/scsi_host/host/service_id Date: June 17, 2006 KernelVersion: 2.6.17 Contact: linux-rdma@vger.kernel.org Description: InfiniBand service ID used for establishing communication with the SRP target. What: /sys/class/scsi_host/host/sgid Date: February 1, 2014 KernelVersion: 3.13 Contact: linux-rdma@vger.kernel.org Description: InfiniBand GID of the source port used for communication with the SRP target. What: /sys/class/scsi_host/host/zero_req_lim Date: September 20, 2006 KernelVersion: 2.6.18 Contact: linux-rdma@vger.kernel.org Description: Number of times the initiator had to wait before sending a request to the target because it ran out of credits. For more information see also the SRP credit algorithm in the SRP specification.