1 /* 2 * Copyright(c) 2007 Intel Corporation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, write to the Free Software Foundation, Inc., 15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 16 * 17 * Maintained at www.Open-FCoE.org 18 */ 19 20 #ifndef _FC_FCP_H_ 21 #define _FC_FCP_H_ 22 23 /* 24 * Fibre Channel Protocol for SCSI. 25 * From T10 FCP-3, T10 project 1560-D Rev 4, Sept. 13, 2005. 26 */ 27 28 /* 29 * fc/fs.h defines FC_TYPE_FCP. 30 */ 31 32 /* 33 * Service parameter page parameters (word 3 bits) for Process Login. 34 */ 35 #define FCP_SPPF_TASK_RETRY_ID 0x0200 /* task retry ID requested */ 36 #define FCP_SPPF_RETRY 0x0100 /* retry supported */ 37 #define FCP_SPPF_CONF_COMPL 0x0080 /* confirmed completion allowed */ 38 #define FCP_SPPF_OVLY_ALLOW 0x0040 /* data overlay allowed */ 39 #define FCP_SPPF_INIT_FCN 0x0020 /* initiator function */ 40 #define FCP_SPPF_TARG_FCN 0x0010 /* target function */ 41 #define FCP_SPPF_RD_XRDY_DIS 0x0002 /* disable XFER_RDY for reads */ 42 #define FCP_SPPF_WR_XRDY_DIS 0x0001 /* disable XFER_RDY for writes */ 43 44 /* 45 * FCP_CMND IU Payload. 46 */ 47 struct fcp_cmnd { 48 __u8 fc_lun[8]; /* logical unit number */ 49 __u8 fc_cmdref; /* command reference number */ 50 __u8 fc_pri_ta; /* priority and task attribute */ 51 __u8 fc_tm_flags; /* task management flags */ 52 __u8 fc_flags; /* additional len & flags */ 53 __u8 fc_cdb[16]; /* base CDB */ 54 __be32 fc_dl; /* data length (must follow fc_cdb) */ 55 }; 56 57 #define FCP_CMND_LEN 32 /* expected length of structure */ 58 59 struct fcp_cmnd32 { 60 __u8 fc_lun[8]; /* logical unit number */ 61 __u8 fc_cmdref; /* command reference number */ 62 __u8 fc_pri_ta; /* priority and task attribute */ 63 __u8 fc_tm_flags; /* task management flags */ 64 __u8 fc_flags; /* additional len & flags */ 65 __u8 fc_cdb[32]; /* base CDB */ 66 __be32 fc_dl; /* data length (must follow fc_cdb) */ 67 }; 68 69 #define FCP_CMND32_LEN 48 /* expected length of structure */ 70 #define FCP_CMND32_ADD_LEN (16 / 4) /* Additional cdb length */ 71 72 /* 73 * fc_pri_ta. 74 */ 75 #define FCP_PTA_SIMPLE 0 /* simple task attribute */ 76 #define FCP_PTA_HEADQ 1 /* head of queue task attribute */ 77 #define FCP_PTA_ORDERED 2 /* ordered task attribute */ 78 #define FCP_PTA_ACA 4 /* auto. contingent allegiance */ 79 #define FCP_PTA_MASK 7 /* mask for task attribute field */ 80 #define FCP_PRI_SHIFT 3 /* priority field starts in bit 3 */ 81 #define FCP_PRI_RESVD_MASK 0x80 /* reserved bits in priority field */ 82 83 /* 84 * fc_tm_flags - task management flags field. 85 */ 86 #define FCP_TMF_CLR_ACA 0x40 /* clear ACA condition */ 87 #define FCP_TMF_TGT_RESET 0x20 /* target reset task management, 88 deprecated as of FCP-3 */ 89 #define FCP_TMF_LUN_RESET 0x10 /* logical unit reset task management */ 90 #define FCP_TMF_CLR_TASK_SET 0x04 /* clear task set */ 91 #define FCP_TMF_ABT_TASK_SET 0x02 /* abort task set */ 92 93 /* 94 * fc_flags. 95 * Bits 7:2 are the additional FCP_CDB length / 4. 96 */ 97 #define FCP_CFL_LEN_MASK 0xfc /* mask for additional length */ 98 #define FCP_CFL_LEN_SHIFT 2 /* shift bits for additional length */ 99 #define FCP_CFL_RDDATA 0x02 /* read data */ 100 #define FCP_CFL_WRDATA 0x01 /* write data */ 101 102 /* 103 * FCP_TXRDY IU - transfer ready payload. 104 */ 105 struct fcp_txrdy { 106 __be32 ft_data_ro; /* data relative offset */ 107 __be32 ft_burst_len; /* burst length */ 108 __u8 _ft_resvd[4]; /* reserved */ 109 }; 110 111 #define FCP_TXRDY_LEN 12 /* expected length of structure */ 112 113 /* 114 * FCP_RESP IU - response payload. 115 * 116 * The response payload comes in three parts: the flags/status, the 117 * sense/response lengths and the sense data/response info section. 118 * 119 * From FCP3r04, note 6 of section 9.5.13: 120 * 121 * Some early implementations presented the FCP_RSP IU without the FCP_RESID, 122 * FCP_SNS_LEN, and FCP_RSP_LEN fields if the FCP_RESID_UNDER, FCP_RESID_OVER, 123 * FCP_SNS_LEN_VALID, and FCP_RSP_LEN_VALID bits were all set to zero. This 124 * non-standard behavior should be tolerated. 125 * 126 * All response frames will always contain the fcp_resp template. Some 127 * will also include the fcp_resp_len template. 128 */ 129 struct fcp_resp { 130 __u8 _fr_resvd[8]; /* reserved */ 131 __be16 fr_retry_delay; /* retry delay timer */ 132 __u8 fr_flags; /* flags */ 133 __u8 fr_status; /* SCSI status code */ 134 }; 135 136 #define FCP_RESP_LEN 12 /* expected length of structure */ 137 138 struct fcp_resp_ext { 139 __be32 fr_resid; /* Residual value */ 140 __be32 fr_sns_len; /* SCSI Sense length */ 141 __be32 fr_rsp_len; /* Response Info length */ 142 143 /* 144 * Optionally followed by RSP info and/or SNS info and/or 145 * bidirectional read residual length, if any. 146 */ 147 }; 148 149 #define FCP_RESP_EXT_LEN 12 /* expected length of the structure */ 150 151 struct fcp_resp_rsp_info { 152 __u8 _fr_resvd[3]; /* reserved */ 153 __u8 rsp_code; /* Response Info Code */ 154 __u8 _fr_resvd2[4]; /* reserved */ 155 }; 156 157 struct fcp_resp_with_ext { 158 struct fcp_resp resp; 159 struct fcp_resp_ext ext; 160 }; 161 162 #define FCP_RESP_WITH_EXT (FCP_RESP_LEN + FCP_RESP_EXT_LEN) 163 164 /* 165 * fr_flags. 166 */ 167 #define FCP_BIDI_RSP 0x80 /* bidirectional read response */ 168 #define FCP_BIDI_READ_UNDER 0x40 /* bidir. read less than requested */ 169 #define FCP_BIDI_READ_OVER 0x20 /* DL insufficient for full transfer */ 170 #define FCP_CONF_REQ 0x10 /* confirmation requested */ 171 #define FCP_RESID_UNDER 0x08 /* transfer shorter than expected */ 172 #define FCP_RESID_OVER 0x04 /* DL insufficient for full transfer */ 173 #define FCP_SNS_LEN_VAL 0x02 /* SNS_LEN field is valid */ 174 #define FCP_RSP_LEN_VAL 0x01 /* RSP_LEN field is valid */ 175 176 /* 177 * rsp_codes 178 */ 179 enum fcp_resp_rsp_codes { 180 FCP_TMF_CMPL = 0, 181 FCP_DATA_LEN_INVALID = 1, 182 FCP_CMND_FIELDS_INVALID = 2, 183 FCP_DATA_PARAM_MISMATCH = 3, 184 FCP_TMF_REJECTED = 4, 185 FCP_TMF_FAILED = 5, 186 FCP_TMF_INVALID_LUN = 9, 187 }; 188 189 /* 190 * FCP SRR Link Service request - Sequence Retransmission Request. 191 */ 192 struct fcp_srr { 193 __u8 srr_op; /* opcode ELS_SRR */ 194 __u8 srr_resvd[3]; /* opcode / reserved - must be zero */ 195 __be16 srr_ox_id; /* OX_ID of failed command */ 196 __be16 srr_rx_id; /* RX_ID of failed command */ 197 __be32 srr_rel_off; /* relative offset */ 198 __u8 srr_r_ctl; /* r_ctl for the information unit */ 199 __u8 srr_resvd2[3]; /* reserved */ 200 }; 201 202 /* 203 * Feature bits in name server FC-4 Features object. 204 */ 205 #define FCP_FEAT_TARG (1 << 0) /* target function supported */ 206 #define FCP_FEAT_INIT (1 << 1) /* initiator function supported */ 207 208 #endif /* _FC_FCP_H_ */ 209