1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * zfcp device driver 4 * 5 * Fibre Channel related definitions and inline functions for the zfcp 6 * device driver 7 * 8 * Copyright IBM Corp. 2009, 2017 9 */ 10 11 #ifndef ZFCP_FC_H 12 #define ZFCP_FC_H 13 14 #include <scsi/fc/fc_els.h> 15 #include <scsi/fc/fc_fcp.h> 16 #include <scsi/fc/fc_ns.h> 17 #include <scsi/scsi_cmnd.h> 18 #include <scsi/scsi_tcq.h> 19 #include "zfcp_fsf.h" 20 21 #define ZFCP_FC_CT_SIZE_PAGE (PAGE_SIZE - sizeof(struct fc_ct_hdr)) 22 #define ZFCP_FC_GPN_FT_ENT_PAGE (ZFCP_FC_CT_SIZE_PAGE \ 23 / sizeof(struct fc_gpn_ft_resp)) 24 #define ZFCP_FC_GPN_FT_NUM_BUFS 4 /* memory pages */ 25 26 #define ZFCP_FC_GPN_FT_MAX_SIZE (ZFCP_FC_GPN_FT_NUM_BUFS * PAGE_SIZE \ 27 - sizeof(struct fc_ct_hdr)) 28 #define ZFCP_FC_GPN_FT_MAX_ENT (ZFCP_FC_GPN_FT_NUM_BUFS * \ 29 (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) 30 31 #define ZFCP_FC_CTELS_TMO (2 * FC_DEF_R_A_TOV / 1000) 32 33 /** 34 * struct zfcp_fc_event - FC HBAAPI event for internal queueing from irq context 35 * @code: Event code 36 * @data: Event data 37 * @list: list_head for zfcp_fc_events list 38 */ 39 struct zfcp_fc_event { 40 enum fc_host_event_code code; 41 u32 data; 42 struct list_head list; 43 }; 44 45 /** 46 * struct zfcp_fc_events - Infrastructure for posting FC events from irq context 47 * @list: List for queueing of events from irq context to workqueue 48 * @list_lock: Lock for event list 49 * @work: work_struct for forwarding events in workqueue 50 */ 51 struct zfcp_fc_events { 52 struct list_head list; 53 spinlock_t list_lock; 54 struct work_struct work; 55 }; 56 57 /** 58 * struct zfcp_fc_gid_pn_req - container for ct header plus gid_pn request 59 * @ct_hdr: FC GS common transport header 60 * @gid_pn: GID_PN request 61 */ 62 struct zfcp_fc_gid_pn_req { 63 struct fc_ct_hdr ct_hdr; 64 struct fc_ns_gid_pn gid_pn; 65 } __packed; 66 67 /** 68 * struct zfcp_fc_gid_pn_rsp - container for ct header plus gid_pn response 69 * @ct_hdr: FC GS common transport header 70 * @gid_pn: GID_PN response 71 */ 72 struct zfcp_fc_gid_pn_rsp { 73 struct fc_ct_hdr ct_hdr; 74 struct fc_gid_pn_resp gid_pn; 75 } __packed; 76 77 /** 78 * struct zfcp_fc_gpn_ft - container for ct header plus gpn_ft request 79 * @ct_hdr: FC GS common transport header 80 * @gpn_ft: GPN_FT request 81 */ 82 struct zfcp_fc_gpn_ft_req { 83 struct fc_ct_hdr ct_hdr; 84 struct fc_ns_gid_ft gpn_ft; 85 } __packed; 86 87 /** 88 * struct zfcp_fc_gspn_req - container for ct header plus GSPN_ID request 89 * @ct_hdr: FC GS common transport header 90 * @gspn: GSPN_ID request 91 */ 92 struct zfcp_fc_gspn_req { 93 struct fc_ct_hdr ct_hdr; 94 struct fc_gid_pn_resp gspn; 95 } __packed; 96 97 /** 98 * struct zfcp_fc_gspn_rsp - container for ct header plus GSPN_ID response 99 * @ct_hdr: FC GS common transport header 100 * @gspn: GSPN_ID response 101 * @name: The name string of the GSPN_ID response 102 */ 103 struct zfcp_fc_gspn_rsp { 104 struct fc_ct_hdr ct_hdr; 105 struct fc_gspn_resp gspn; 106 char name[FC_SYMBOLIC_NAME_SIZE]; 107 } __packed; 108 109 /** 110 * struct zfcp_fc_rspn_req - container for ct header plus RSPN_ID request 111 * @ct_hdr: FC GS common transport header 112 * @rspn: RSPN_ID request 113 * @name: The name string of the RSPN_ID request 114 */ 115 struct zfcp_fc_rspn_req { 116 struct fc_ct_hdr ct_hdr; 117 struct fc_ns_rspn rspn; 118 char name[FC_SYMBOLIC_NAME_SIZE]; 119 } __packed; 120 121 /** 122 * struct zfcp_fc_req - Container for FC ELS and CT requests sent from zfcp 123 * @ct_els: data required for issuing fsf command 124 * @sg_req: scatterlist entry for request data, refers to embedded @u submember 125 * @sg_rsp: scatterlist entry for response data, refers to embedded @u submember 126 * @u: request and response specific data 127 * @u.adisc: ADISC specific data 128 * @u.adisc.req: ADISC request 129 * @u.adisc.rsp: ADISC response 130 * @u.gid_pn: GID_PN specific data 131 * @u.gid_pn.req: GID_PN request 132 * @u.gid_pn.rsp: GID_PN response 133 * @u.gpn_ft: GPN_FT specific data 134 * @u.gpn_ft.sg_rsp2: GPN_FT response, not embedded here, allocated elsewhere 135 * @u.gpn_ft.req: GPN_FT request 136 * @u.gspn: GSPN specific data 137 * @u.gspn.req: GSPN request 138 * @u.gspn.rsp: GSPN response 139 * @u.rspn: RSPN specific data 140 * @u.rspn.req: RSPN request 141 * @u.rspn.rsp: RSPN response 142 */ 143 struct zfcp_fc_req { 144 struct zfcp_fsf_ct_els ct_els; 145 struct scatterlist sg_req; 146 struct scatterlist sg_rsp; 147 union { 148 struct { 149 struct fc_els_adisc req; 150 struct fc_els_adisc rsp; 151 } adisc; 152 struct { 153 struct zfcp_fc_gid_pn_req req; 154 struct zfcp_fc_gid_pn_rsp rsp; 155 } gid_pn; 156 struct { 157 struct scatterlist sg_rsp2[ZFCP_FC_GPN_FT_NUM_BUFS - 1]; 158 struct zfcp_fc_gpn_ft_req req; 159 } gpn_ft; 160 struct { 161 struct zfcp_fc_gspn_req req; 162 struct zfcp_fc_gspn_rsp rsp; 163 } gspn; 164 struct { 165 struct zfcp_fc_rspn_req req; 166 struct fc_ct_hdr rsp; 167 } rspn; 168 } u; 169 }; 170 171 /** 172 * enum zfcp_fc_wka_status - FC WKA port status in zfcp 173 * @ZFCP_FC_WKA_PORT_OFFLINE: Port is closed and not in use 174 * @ZFCP_FC_WKA_PORT_CLOSING: The FSF "close port" request is pending 175 * @ZFCP_FC_WKA_PORT_OPENING: The FSF "open port" request is pending 176 * @ZFCP_FC_WKA_PORT_ONLINE: The port is open and the port handle is valid 177 */ 178 enum zfcp_fc_wka_status { 179 ZFCP_FC_WKA_PORT_OFFLINE, 180 ZFCP_FC_WKA_PORT_CLOSING, 181 ZFCP_FC_WKA_PORT_OPENING, 182 ZFCP_FC_WKA_PORT_ONLINE, 183 }; 184 185 /** 186 * struct zfcp_fc_wka_port - representation of well-known-address (WKA) FC port 187 * @adapter: Pointer to adapter structure this WKA port belongs to 188 * @opened: Wait for completion of open command 189 * @closed: Wait for completion of close command 190 * @status: Current status of WKA port 191 * @refcount: Reference count to keep port open as long as it is in use 192 * @d_id: FC destination id or well-known-address 193 * @handle: FSF handle for the open WKA port 194 * @mutex: Mutex used during opening/closing state changes 195 * @work: For delaying the closing of the WKA port 196 */ 197 struct zfcp_fc_wka_port { 198 struct zfcp_adapter *adapter; 199 wait_queue_head_t opened; 200 wait_queue_head_t closed; 201 enum zfcp_fc_wka_status status; 202 atomic_t refcount; 203 u32 d_id; 204 u32 handle; 205 struct mutex mutex; 206 struct delayed_work work; 207 }; 208 209 /** 210 * struct zfcp_fc_wka_ports - Data structures for FC generic services 211 * @ms: FC Management service 212 * @ts: FC time service 213 * @ds: FC directory service 214 * @as: FC alias service 215 */ 216 struct zfcp_fc_wka_ports { 217 struct zfcp_fc_wka_port ms; 218 struct zfcp_fc_wka_port ts; 219 struct zfcp_fc_wka_port ds; 220 struct zfcp_fc_wka_port as; 221 }; 222 223 /** 224 * zfcp_fc_scsi_to_fcp - setup FCP command with data from scsi_cmnd 225 * @fcp: fcp_cmnd to setup 226 * @scsi: scsi_cmnd where to get LUN, task attributes/flags and CDB 227 */ 228 static inline 229 void zfcp_fc_scsi_to_fcp(struct fcp_cmnd *fcp, struct scsi_cmnd *scsi) 230 { 231 u32 datalen; 232 233 int_to_scsilun(scsi->device->lun, (struct scsi_lun *) &fcp->fc_lun); 234 235 fcp->fc_pri_ta = FCP_PTA_SIMPLE; 236 237 if (scsi->sc_data_direction == DMA_FROM_DEVICE) 238 fcp->fc_flags |= FCP_CFL_RDDATA; 239 if (scsi->sc_data_direction == DMA_TO_DEVICE) 240 fcp->fc_flags |= FCP_CFL_WRDATA; 241 242 memcpy(fcp->fc_cdb, scsi->cmnd, scsi->cmd_len); 243 244 datalen = scsi_bufflen(scsi); 245 fcp->fc_dl = cpu_to_be32(datalen); 246 247 if (scsi_get_prot_type(scsi) == SCSI_PROT_DIF_TYPE1) { 248 datalen += datalen / scsi->device->sector_size * 8; 249 fcp->fc_dl = cpu_to_be32(datalen); 250 } 251 } 252 253 /** 254 * zfcp_fc_fcp_tm() - Setup FCP command as task management command. 255 * @fcp: Pointer to FCP_CMND IU to set up. 256 * @dev: Pointer to SCSI_device where to send the task management command. 257 * @tm_flags: Task management flags to setup tm command. 258 */ 259 static inline 260 void zfcp_fc_fcp_tm(struct fcp_cmnd *fcp, struct scsi_device *dev, u8 tm_flags) 261 { 262 int_to_scsilun(dev->lun, (struct scsi_lun *) &fcp->fc_lun); 263 fcp->fc_tm_flags = tm_flags; 264 } 265 266 /** 267 * zfcp_fc_evap_fcp_rsp - evaluate FCP RSP IU and update scsi_cmnd accordingly 268 * @fcp_rsp: FCP RSP IU to evaluate 269 * @scsi: SCSI command where to update status and sense buffer 270 */ 271 static inline 272 void zfcp_fc_eval_fcp_rsp(struct fcp_resp_with_ext *fcp_rsp, 273 struct scsi_cmnd *scsi) 274 { 275 struct fcp_resp_rsp_info *rsp_info; 276 char *sense; 277 u32 sense_len, resid; 278 u8 rsp_flags; 279 280 scsi->result |= fcp_rsp->resp.fr_status; 281 282 rsp_flags = fcp_rsp->resp.fr_flags; 283 284 if (unlikely(rsp_flags & FCP_RSP_LEN_VAL)) { 285 rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1]; 286 if (rsp_info->rsp_code == FCP_TMF_CMPL) 287 set_host_byte(scsi, DID_OK); 288 else { 289 set_host_byte(scsi, DID_ERROR); 290 return; 291 } 292 } 293 294 if (unlikely(rsp_flags & FCP_SNS_LEN_VAL)) { 295 sense = (char *) &fcp_rsp[1]; 296 if (rsp_flags & FCP_RSP_LEN_VAL) 297 sense += be32_to_cpu(fcp_rsp->ext.fr_rsp_len); 298 sense_len = min_t(u32, be32_to_cpu(fcp_rsp->ext.fr_sns_len), 299 SCSI_SENSE_BUFFERSIZE); 300 memcpy(scsi->sense_buffer, sense, sense_len); 301 } 302 303 if (unlikely(rsp_flags & FCP_RESID_UNDER)) { 304 resid = be32_to_cpu(fcp_rsp->ext.fr_resid); 305 scsi_set_resid(scsi, resid); 306 if (scsi_bufflen(scsi) - resid < scsi->underflow && 307 !(rsp_flags & FCP_SNS_LEN_VAL) && 308 fcp_rsp->resp.fr_status == SAM_STAT_GOOD) 309 set_host_byte(scsi, DID_ERROR); 310 } else if (unlikely(rsp_flags & FCP_RESID_OVER)) { 311 /* FCP_DL was not sufficient for SCSI data length */ 312 if (fcp_rsp->resp.fr_status == SAM_STAT_GOOD) 313 set_host_byte(scsi, DID_ERROR); 314 } 315 } 316 317 #endif 318