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Diffstat (limited to '')
| -rw-r--r-- | include/scsi/srp.h | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/include/scsi/srp.h b/include/scsi/srp.h new file mode 100644 index 000000000..177d8026e --- /dev/null +++ b/include/scsi/srp.h @@ -0,0 +1,318 @@ +/* + * Copyright (c) 2005 Cisco Systems. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * $Id$ + */ + +#ifndef SCSI_SRP_H +#define SCSI_SRP_H + +/* + * Structures and constants for the SCSI RDMA Protocol (SRP) as + * defined by the INCITS T10 committee. This file was written using + * draft Revision 16a of the SRP standard. + */ + +#include <linux/types.h> +#include <scsi/scsi.h> + +enum { + SRP_LOGIN_REQ = 0x00, + SRP_TSK_MGMT = 0x01, + SRP_CMD = 0x02, + SRP_I_LOGOUT = 0x03, + SRP_LOGIN_RSP = 0xc0, + SRP_RSP = 0xc1, + SRP_LOGIN_REJ = 0xc2, + SRP_T_LOGOUT = 0x80, + SRP_CRED_REQ = 0x81, + SRP_AER_REQ = 0x82, + SRP_CRED_RSP = 0x41, + SRP_AER_RSP = 0x42 +}; + +enum { + SRP_BUF_FORMAT_DIRECT = 1 << 1, + SRP_BUF_FORMAT_INDIRECT = 1 << 2 +}; + +enum { + SRP_NO_DATA_DESC = 0, + SRP_DATA_DESC_DIRECT = 1, + SRP_DATA_DESC_INDIRECT = 2, + SRP_DATA_DESC_IMM = 3, /* new in SRP2 */ +}; + +enum { + SRP_TSK_ABORT_TASK = 0x01, + SRP_TSK_ABORT_TASK_SET = 0x02, + SRP_TSK_CLEAR_TASK_SET = 0x04, + SRP_TSK_LUN_RESET = 0x08, + SRP_TSK_CLEAR_ACA = 0x40 +}; + +enum srp_login_rej_reason { + SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL = 0x00010000, + SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES = 0x00010001, + SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE = 0x00010002, + SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL = 0x00010003, + SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT = 0x00010004, + SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED = 0x00010005, + SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED = 0x00010006 +}; + +enum { + SRP_REV10_IB_IO_CLASS = 0xff00, + SRP_REV16A_IB_IO_CLASS = 0x0100 +}; + +struct srp_direct_buf { + __be64 va; + __be32 key; + __be32 len; +}; + +/* + * We need the packed attribute because the SRP spec puts the list of + * descriptors at an offset of 20, which is not aligned to the size of + * struct srp_direct_buf. The whole structure must be packed to avoid + * having the 20-byte structure padded to 24 bytes on 64-bit architectures. + */ +struct srp_indirect_buf { + struct srp_direct_buf table_desc; + __be32 len; + struct srp_direct_buf desc_list[]; +} __attribute__((packed)); + +/* Immediate data buffer descriptor as defined in SRP2. */ +struct srp_imm_buf { + __be32 len; +}; + +/* srp_login_req.flags */ +enum { + SRP_MULTICHAN_SINGLE = 0, + SRP_MULTICHAN_MULTI = 1, + SRP_IMMED_REQUESTED = 0x80, /* new in SRP2 */ +}; + +struct srp_login_req { + u8 opcode; + u8 reserved1[7]; + u64 tag; + __be32 req_it_iu_len; + u8 reserved2[4]; + __be16 req_buf_fmt; + u8 req_flags; + u8 reserved3[1]; + __be16 imm_data_offset; /* new in SRP2 */ + u8 reserved4[2]; + u8 initiator_port_id[16]; + u8 target_port_id[16]; +}; + +/** + * struct srp_login_req_rdma - RDMA/CM login parameters. + * + * RDMA/CM over InfiniBand can only carry 92 - 36 = 56 bytes of private + * data. The %srp_login_req_rdma structure contains the same information as + * %srp_login_req but with the reserved data removed. + */ +struct srp_login_req_rdma { + u64 tag; + __be16 req_buf_fmt; + u8 req_flags; + u8 opcode; + __be32 req_it_iu_len; + u8 initiator_port_id[16]; + u8 target_port_id[16]; + __be16 imm_data_offset; + u8 reserved[6]; +}; + +/* srp_login_rsp.rsp_flags */ +enum { + SRP_LOGIN_RSP_MULTICHAN_NO_CHAN = 0x0, + SRP_LOGIN_RSP_MULTICHAN_TERMINATED = 0x1, + SRP_LOGIN_RSP_MULTICHAN_MAINTAINED = 0x2, + SRP_LOGIN_RSP_IMMED_SUPP = 0x80, /* new in SRP2 */ +}; + +/* + * The SRP spec defines the size of the LOGIN_RSP structure to be 52 + * bytes, so it needs to be packed to avoid having it padded to 56 + * bytes on 64-bit architectures. + */ +struct srp_login_rsp { + u8 opcode; + u8 reserved1[3]; + __be32 req_lim_delta; + u64 tag; + __be32 max_it_iu_len; + __be32 max_ti_iu_len; + __be16 buf_fmt; + u8 rsp_flags; + u8 reserved2[25]; +} __attribute__((packed)); + +struct srp_login_rej { + u8 opcode; + u8 reserved1[3]; + __be32 reason; + u64 tag; + u8 reserved2[8]; + __be16 buf_fmt; + u8 reserved3[6]; +}; + +struct srp_i_logout { + u8 opcode; + u8 reserved[7]; + u64 tag; +}; + +struct srp_t_logout { + u8 opcode; + u8 sol_not; + u8 reserved[2]; + __be32 reason; + u64 tag; +}; + +/* + * We need the packed attribute because the SRP spec only aligns the + * 8-byte LUN field to 4 bytes. + */ +struct srp_tsk_mgmt { + u8 opcode; + u8 sol_not; + u8 reserved1[6]; + u64 tag; + u8 reserved2[4]; + struct scsi_lun lun; + u8 reserved3[2]; + u8 tsk_mgmt_func; + u8 reserved4; + u64 task_tag; + u8 reserved5[8]; +}; + +/* + * We need the packed attribute because the SRP spec only aligns the + * 8-byte LUN field to 4 bytes. + */ +struct srp_cmd { + u8 opcode; + u8 sol_not; + u8 reserved1[3]; + u8 buf_fmt; + u8 data_out_desc_cnt; + u8 data_in_desc_cnt; + u64 tag; + u8 reserved2[4]; + struct scsi_lun lun; + u8 reserved3; + u8 task_attr; + u8 reserved4; + u8 add_cdb_len; + u8 cdb[16]; + u8 add_data[]; +}; + +enum { + SRP_RSP_FLAG_RSPVALID = 1 << 0, + SRP_RSP_FLAG_SNSVALID = 1 << 1, + SRP_RSP_FLAG_DOOVER = 1 << 2, + SRP_RSP_FLAG_DOUNDER = 1 << 3, + SRP_RSP_FLAG_DIOVER = 1 << 4, + SRP_RSP_FLAG_DIUNDER = 1 << 5 +}; + +/* + * The SRP spec defines the size of the RSP structure to be 36 bytes, + * so it needs to be packed to avoid having it padded to 40 bytes on + * 64-bit architectures. + */ +struct srp_rsp { + u8 opcode; + u8 sol_not; + u8 reserved1[2]; + __be32 req_lim_delta; + u64 tag; + u8 reserved2[2]; + u8 flags; + u8 status; + __be32 data_out_res_cnt; + __be32 data_in_res_cnt; + __be32 sense_data_len; + __be32 resp_data_len; + u8 data[]; +} __attribute__((packed)); + +struct srp_cred_req { + u8 opcode; + u8 sol_not; + u8 reserved[2]; + __be32 req_lim_delta; + u64 tag; +}; + +struct srp_cred_rsp { + u8 opcode; + u8 reserved[7]; + u64 tag; +}; + +/* + * The SRP spec defines the fixed portion of the AER_REQ structure to be + * 36 bytes, so it needs to be packed to avoid having it padded to 40 bytes + * on 64-bit architectures. + */ +struct srp_aer_req { + u8 opcode; + u8 sol_not; + u8 reserved[2]; + __be32 req_lim_delta; + u64 tag; + u32 reserved2; + struct scsi_lun lun; + __be32 sense_data_len; + u32 reserved3; + u8 sense_data[]; +} __attribute__((packed)); + +struct srp_aer_rsp { + u8 opcode; + u8 reserved[7]; + u64 tag; +}; + +#endif /* SCSI_SRP_H */ |