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