| What: /sys/class/infiniband_srp/srp-<hca>-<port_number>/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. |
| |
| What: /sys/class/infiniband_srp/srp-<hca>-<port_number>/ibdev |
| Date: January 2, 2006 |
| KernelVersion: 2.6.15 |
| Contact: linux-rdma@vger.kernel.org |
| Description: HCA name (<hca>). |
| |
| What: /sys/class/infiniband_srp/srp-<hca>-<port_number>/port |
| Date: January 2, 2006 |
| KernelVersion: 2.6.15 |
| Contact: linux-rdma@vger.kernel.org |
| Description: HCA port number (<port_number>). |
| |
| What: /sys/class/scsi_host/host<n>/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<n>/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<n>/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<n>/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<n>/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<n>/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<n>/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<n>/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<n>/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<n>/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<n>/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<n>/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<n>/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<n>/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<n>/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. |
