drivers/s390/scsi/zfcp_fc.h

   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  * @completion_wq: Wait for completion of open/close command
 189  * @status: Current status of WKA port
 190  * @refcount: Reference count to keep port open as long as it is in use
 191  * @d_id: FC destination id or well-known-address
 192  * @handle: FSF handle for the open WKA port
 193  * @mutex: Mutex used during opening/closing state changes
 194  * @work: For delaying the closing of the WKA port
 195  */
 196 struct zfcp_fc_wka_port {
 197         struct zfcp_adapter     *adapter;
 198         wait_queue_head_t       completion_wq;
 199         enum zfcp_fc_wka_status status;
 200         atomic_t                refcount;
 201         u32                     d_id;
 202         u32                     handle;
 203         struct mutex            mutex;
 204         struct delayed_work     work;
 205 };
 206
 207 /**
 208  * struct zfcp_fc_wka_ports - Data structures for FC generic services
 209  * @ms: FC Management service
 210  * @ts: FC time service
 211  * @ds: FC directory service
 212  * @as: FC alias service
 213  */
 214 struct zfcp_fc_wka_ports {
 215         struct zfcp_fc_wka_port ms;
 216         struct zfcp_fc_wka_port ts;
 217         struct zfcp_fc_wka_port ds;
 218         struct zfcp_fc_wka_port as;
 219 };
 220
 221 /**
 222  * zfcp_fc_scsi_to_fcp - setup FCP command with data from scsi_cmnd
 223  * @fcp: fcp_cmnd to setup
 224  * @scsi: scsi_cmnd where to get LUN, task attributes/flags and CDB
 225  */
 226 static inline
 227 void zfcp_fc_scsi_to_fcp(struct fcp_cmnd *fcp, struct scsi_cmnd *scsi)
 228 {
 229         u32 datalen;
 230
 231         int_to_scsilun(scsi->device->lun, (struct scsi_lun *) &fcp->fc_lun);
 232
 233         fcp->fc_pri_ta = FCP_PTA_SIMPLE;
 234
 235         if (scsi->sc_data_direction == DMA_FROM_DEVICE)
 236                 fcp->fc_flags |= FCP_CFL_RDDATA;
 237         if (scsi->sc_data_direction == DMA_TO_DEVICE)
 238                 fcp->fc_flags |= FCP_CFL_WRDATA;
 239
 240         memcpy(fcp->fc_cdb, scsi->cmnd, scsi->cmd_len);
 241
 242         datalen = scsi_bufflen(scsi);
 243         fcp->fc_dl = cpu_to_be32(datalen);
 244
 245         if (scsi_get_prot_type(scsi) == SCSI_PROT_DIF_TYPE1) {
 246                 datalen += datalen / scsi->device->sector_size * 8;
 247                 fcp->fc_dl = cpu_to_be32(datalen);
 248         }
 249 }
 250
 251 /**
 252  * zfcp_fc_fcp_tm() - Setup FCP command as task management command.
 253  * @fcp: Pointer to FCP_CMND IU to set up.
 254  * @dev: Pointer to SCSI_device where to send the task management command.
 255  * @tm_flags: Task management flags to setup tm command.
 256  */
 257 static inline
 258 void zfcp_fc_fcp_tm(struct fcp_cmnd *fcp, struct scsi_device *dev, u8 tm_flags)
 259 {
 260         int_to_scsilun(dev->lun, (struct scsi_lun *) &fcp->fc_lun);
 261         fcp->fc_tm_flags = tm_flags;
 262 }
 263
 264 /**
 265  * zfcp_fc_evap_fcp_rsp - evaluate FCP RSP IU and update scsi_cmnd accordingly
 266  * @fcp_rsp: FCP RSP IU to evaluate
 267  * @scsi: SCSI command where to update status and sense buffer
 268  */
 269 static inline
 270 void zfcp_fc_eval_fcp_rsp(struct fcp_resp_with_ext *fcp_rsp,
 271                           struct scsi_cmnd *scsi)
 272 {
 273         struct fcp_resp_rsp_info *rsp_info;
 274         char *sense;
 275         u32 sense_len, resid;
 276         u8 rsp_flags;
 277
 278         set_msg_byte(scsi, COMMAND_COMPLETE);
 279         scsi->result |= fcp_rsp->resp.fr_status;
 280
 281         rsp_flags = fcp_rsp->resp.fr_flags;
 282
 283         if (unlikely(rsp_flags & FCP_RSP_LEN_VAL)) {
 284                 rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
 285                 if (rsp_info->rsp_code == FCP_TMF_CMPL)
 286                         set_host_byte(scsi, DID_OK);
 287                 else {
 288                         set_host_byte(scsi, DID_ERROR);
 289                         return;
 290                 }
 291         }
 292
 293         if (unlikely(rsp_flags & FCP_SNS_LEN_VAL)) {
 294                 sense = (char *) &fcp_rsp[1];
 295                 if (rsp_flags & FCP_RSP_LEN_VAL)
 296                         sense += be32_to_cpu(fcp_rsp->ext.fr_rsp_len);
 297                 sense_len = min_t(u32, be32_to_cpu(fcp_rsp->ext.fr_sns_len),
 298                                   SCSI_SENSE_BUFFERSIZE);
 299                 memcpy(scsi->sense_buffer, sense, sense_len);
 300         }
 301
 302         if (unlikely(rsp_flags & FCP_RESID_UNDER)) {
 303                 resid = be32_to_cpu(fcp_rsp->ext.fr_resid);
 304                 scsi_set_resid(scsi, resid);
 305                 if (scsi_bufflen(scsi) - resid < scsi->underflow &&
 306                      !(rsp_flags & FCP_SNS_LEN_VAL) &&
 307                      fcp_rsp->resp.fr_status == SAM_STAT_GOOD)
 308                         set_host_byte(scsi, DID_ERROR);
 309         } else if (unlikely(rsp_flags & FCP_RESID_OVER)) {
 310                 /* FCP_DL was not sufficient for SCSI data length */
 311                 if (fcp_rsp->resp.fr_status == SAM_STAT_GOOD)
 312                         set_host_byte(scsi, DID_ERROR);
 313         }
 314 }
 315
 316 #endif