1What: /sys/class/infiniband_srp/srp-<hca>-<port_number>/add_target 2Date: January 2, 2006 3KernelVersion: 2.6.15 4Contact: linux-rdma@vger.kernel.org 5Description: Interface for making ib_srp connect to a new target. 6 One can request ib_srp to connect to a new target by writing 7 a comma-separated list of login parameters to this sysfs 8 attribute. The supported parameters are: 9 * id_ext, a 16-digit hexadecimal number specifying the eight 10 byte identifier extension in the 16-byte SRP target port 11 identifier. The target port identifier is sent by ib_srp 12 to the target in the SRP_LOGIN_REQ request. 13 * ioc_guid, a 16-digit hexadecimal number specifying the eight 14 byte I/O controller GUID portion of the 16-byte target port 15 identifier. 16 * dgid, a 32-digit hexadecimal number specifying the 17 destination GID. 18 * pkey, a four-digit hexadecimal number specifying the 19 InfiniBand partition key. 20 * service_id, a 16-digit hexadecimal number specifying the 21 InfiniBand service ID used to establish communication with 22 the SRP target. How to find out the value of the service ID 23 is specified in the documentation of the SRP target. 24 * max_sect, a decimal number specifying the maximum number of 25 512-byte sectors to be transferred via a single SCSI command. 26 * max_cmd_per_lun, a decimal number specifying the maximum 27 number of outstanding commands for a single LUN. 28 * io_class, a hexadecimal number specifying the SRP I/O class. 29 Must be either 0xff00 (rev 10) or 0x0100 (rev 16a). The I/O 30 class defines the format of the SRP initiator and target 31 port identifiers. 32 * initiator_ext, a 16-digit hexadecimal number specifying the 33 identifier extension portion of the SRP initiator port 34 identifier. This data is sent by the initiator to the target 35 in the SRP_LOGIN_REQ request. 36 * cmd_sg_entries, a number in the range 1..255 that specifies 37 the maximum number of data buffer descriptors stored in the 38 SRP_CMD information unit itself. With allow_ext_sg=0 the 39 parameter cmd_sg_entries defines the maximum S/G list length 40 for a single SRP_CMD, and commands whose S/G list length 41 exceeds this limit after S/G list collapsing will fail. 42 * allow_ext_sg, whether ib_srp is allowed to include a partial 43 memory descriptor list in an SRP_CMD instead of the entire 44 list. If a partial memory descriptor list has been included 45 in an SRP_CMD the remaining memory descriptors are 46 communicated from initiator to target via an additional RDMA 47 transfer. Setting allow_ext_sg to 1 increases the maximum 48 amount of data that can be transferred between initiator and 49 target via a single SCSI command. Since not all SRP target 50 implementations support partial memory descriptor lists the 51 default value for this option is 0. 52 * sg_tablesize, a number in the range 1..2048 specifying the 53 maximum S/G list length the SCSI layer is allowed to pass to 54 ib_srp. Specifying a value that exceeds cmd_sg_entries is 55 only safe with partial memory descriptor list support enabled 56 (allow_ext_sg=1). 57 * comp_vector, a number in the range 0..n-1 specifying the 58 MSI-X completion vector of the first RDMA channel. Some 59 HCA's allocate multiple (n) MSI-X vectors per HCA port. If 60 the IRQ affinity masks of these interrupts have been 61 configured such that each MSI-X interrupt is handled by a 62 different CPU then the comp_vector parameter can be used to 63 spread the SRP completion workload over multiple CPU's. 64 * tl_retry_count, a number in the range 2..7 specifying the 65 IB RC retry count. 66 * queue_size, the maximum number of commands that the 67 initiator is allowed to queue per SCSI host. The default 68 value for this parameter is 62. The lowest supported value 69 is 2. 70 71What: /sys/class/infiniband_srp/srp-<hca>-<port_number>/ibdev 72Date: January 2, 2006 73KernelVersion: 2.6.15 74Contact: linux-rdma@vger.kernel.org 75Description: HCA name (<hca>). 76 77What: /sys/class/infiniband_srp/srp-<hca>-<port_number>/port 78Date: January 2, 2006 79KernelVersion: 2.6.15 80Contact: linux-rdma@vger.kernel.org 81Description: HCA port number (<port_number>). 82 83What: /sys/class/scsi_host/host<n>/allow_ext_sg 84Date: May 19, 2011 85KernelVersion: 2.6.39 86Contact: linux-rdma@vger.kernel.org 87Description: Whether ib_srp is allowed to include a partial memory 88 descriptor list in an SRP_CMD when communicating with an SRP 89 target. 90 91What: /sys/class/scsi_host/host<n>/ch_count 92Date: April 1, 2015 93KernelVersion: 3.19 94Contact: linux-rdma@vger.kernel.org 95Description: Number of RDMA channels used for communication with the SRP 96 target. 97 98What: /sys/class/scsi_host/host<n>/cmd_sg_entries 99Date: May 19, 2011 100KernelVersion: 2.6.39 101Contact: linux-rdma@vger.kernel.org 102Description: Maximum number of data buffer descriptors that may be sent to 103 the target in a single SRP_CMD request. 104 105What: /sys/class/scsi_host/host<n>/comp_vector 106Date: September 2, 2013 107KernelVersion: 3.11 108Contact: linux-rdma@vger.kernel.org 109Description: Completion vector used for the first RDMA channel. 110 111What: /sys/class/scsi_host/host<n>/dgid 112Date: June 17, 2006 113KernelVersion: 2.6.17 114Contact: linux-rdma@vger.kernel.org 115Description: InfiniBand destination GID used for communication with the SRP 116 target. Differs from orig_dgid if port redirection has happened. 117 118What: /sys/class/scsi_host/host<n>/id_ext 119Date: June 17, 2006 120KernelVersion: 2.6.17 121Contact: linux-rdma@vger.kernel.org 122Description: Eight-byte identifier extension portion of the 16-byte target 123 port identifier. 124 125What: /sys/class/scsi_host/host<n>/ioc_guid 126Date: June 17, 2006 127KernelVersion: 2.6.17 128Contact: linux-rdma@vger.kernel.org 129Description: Eight-byte I/O controller GUID portion of the 16-byte target 130 port identifier. 131 132What: /sys/class/scsi_host/host<n>/local_ib_device 133Date: November 29, 2006 134KernelVersion: 2.6.19 135Contact: linux-rdma@vger.kernel.org 136Description: Name of the InfiniBand HCA used for communicating with the 137 SRP target. 138 139What: /sys/class/scsi_host/host<n>/local_ib_port 140Date: November 29, 2006 141KernelVersion: 2.6.19 142Contact: linux-rdma@vger.kernel.org 143Description: Number of the HCA port used for communicating with the 144 SRP target. 145 146What: /sys/class/scsi_host/host<n>/orig_dgid 147Date: June 17, 2006 148KernelVersion: 2.6.17 149Contact: linux-rdma@vger.kernel.org 150Description: InfiniBand destination GID specified in the parameters 151 written to the add_target sysfs attribute. 152 153What: /sys/class/scsi_host/host<n>/pkey 154Date: June 17, 2006 155KernelVersion: 2.6.17 156Contact: linux-rdma@vger.kernel.org 157Description: A 16-bit number representing the InfiniBand partition key used 158 for communication with the SRP target. 159 160What: /sys/class/scsi_host/host<n>/req_lim 161Date: October 20, 2010 162KernelVersion: 2.6.36 163Contact: linux-rdma@vger.kernel.org 164Description: Number of requests ib_srp can send to the target before it has 165 to wait for more credits. For more information see also the 166 SRP credit algorithm in the SRP specification. 167 168What: /sys/class/scsi_host/host<n>/service_id 169Date: June 17, 2006 170KernelVersion: 2.6.17 171Contact: linux-rdma@vger.kernel.org 172Description: InfiniBand service ID used for establishing communication with 173 the SRP target. 174 175What: /sys/class/scsi_host/host<n>/sgid 176Date: February 1, 2014 177KernelVersion: 3.13 178Contact: linux-rdma@vger.kernel.org 179Description: InfiniBand GID of the source port used for communication with 180 the SRP target. 181 182What: /sys/class/scsi_host/host<n>/zero_req_lim 183Date: September 20, 2006 184KernelVersion: 2.6.18 185Contact: linux-rdma@vger.kernel.org 186Description: Number of times the initiator had to wait before sending a 187 request to the target because it ran out of credits. For more 188 information see also the SRP credit algorithm in the SRP 189 specification. 190