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
 125  * @sg_rsp: scatterlist entry for response data
 126  * @u: request specific data
 127  */
 128 struct zfcp_fc_req {
 129         struct zfcp_fsf_ct_els                          ct_els;
 130         struct scatterlist                              sg_req;
 131         struct scatterlist                              sg_rsp;
 132         union {
 133                 struct {
 134                         struct fc_els_adisc             req;
 135                         struct fc_els_adisc             rsp;
 136                 } adisc;
 137                 struct {
 138                         struct zfcp_fc_gid_pn_req       req;
 139                         struct zfcp_fc_gid_pn_rsp       rsp;
 140                 } gid_pn;
 141                 struct {
 142                         struct scatterlist sg_rsp2[ZFCP_FC_GPN_FT_NUM_BUFS - 1];
 143                         struct zfcp_fc_gpn_ft_req       req;
 144                 } gpn_ft;
 145                 struct {
 146                         struct zfcp_fc_gspn_req         req;
 147                         struct zfcp_fc_gspn_rsp         rsp;
 148                 } gspn;
 149                 struct {
 150                         struct zfcp_fc_rspn_req         req;
 151                         struct fc_ct_hdr                rsp;
 152                 } rspn;
 153         } u;
 154 };
 155
 156 /**
 157  * enum zfcp_fc_wka_status - FC WKA port status in zfcp
 158  * @ZFCP_FC_WKA_PORT_OFFLINE: Port is closed and not in use
 159  * @ZFCP_FC_WKA_PORT_CLOSING: The FSF "close port" request is pending
 160  * @ZFCP_FC_WKA_PORT_OPENING: The FSF "open port" request is pending
 161  * @ZFCP_FC_WKA_PORT_ONLINE: The port is open and the port handle is valid
 162  */
 163 enum zfcp_fc_wka_status {
 164         ZFCP_FC_WKA_PORT_OFFLINE,
 165         ZFCP_FC_WKA_PORT_CLOSING,
 166         ZFCP_FC_WKA_PORT_OPENING,
 167         ZFCP_FC_WKA_PORT_ONLINE,
 168 };
 169
 170 /**
 171  * struct zfcp_fc_wka_port - representation of well-known-address (WKA) FC port
 172  * @adapter: Pointer to adapter structure this WKA port belongs to
 173  * @opened: Wait for completion of open command
 174  * @closed: Wait for completion of close command
 175  * @status: Current status of WKA port
 176  * @refcount: Reference count to keep port open as long as it is in use
 177  * @d_id: FC destination id or well-known-address
 178  * @handle: FSF handle for the open WKA port
 179  * @mutex: Mutex used during opening/closing state changes
 180  * @work: For delaying the closing of the WKA port
 181  */
 182 struct zfcp_fc_wka_port {
 183         struct zfcp_adapter     *adapter;
 184         wait_queue_head_t       opened;
 185         wait_queue_head_t       closed;
 186         enum zfcp_fc_wka_status status;
 187         atomic_t                refcount;
 188         u32                     d_id;
 189         u32                     handle;
 190         struct mutex            mutex;
 191         struct delayed_work     work;
 192 };
 193
 194 /**
 195  * struct zfcp_fc_wka_ports - Data structures for FC generic services
 196  * @ms: FC Management service
 197  * @ts: FC time service
 198  * @ds: FC directory service
 199  * @as: FC alias service
 200  */
 201 struct zfcp_fc_wka_ports {
 202         struct zfcp_fc_wka_port ms;
 203         struct zfcp_fc_wka_port ts;
 204         struct zfcp_fc_wka_port ds;
 205         struct zfcp_fc_wka_port as;
 206 };
 207
 208 /**
 209  * zfcp_fc_scsi_to_fcp - setup FCP command with data from scsi_cmnd
 210  * @fcp: fcp_cmnd to setup
 211  * @scsi: scsi_cmnd where to get LUN, task attributes/flags and CDB
 212  * @tm: task management flags to setup task management command
 213  */
 214 static inline
 215 void zfcp_fc_scsi_to_fcp(struct fcp_cmnd *fcp, struct scsi_cmnd *scsi,
 216                          u8 tm_flags)
 217 {
 218         u32 datalen;
 219
 220         int_to_scsilun(scsi->device->lun, (struct scsi_lun *) &fcp->fc_lun);
 221
 222         if (unlikely(tm_flags)) {
 223                 fcp->fc_tm_flags = tm_flags;
 224                 return;
 225         }
 226
 227         fcp->fc_pri_ta = FCP_PTA_SIMPLE;
 228
 229         if (scsi->sc_data_direction == DMA_FROM_DEVICE)
 230                 fcp->fc_flags |= FCP_CFL_RDDATA;
 231         if (scsi->sc_data_direction == DMA_TO_DEVICE)
 232                 fcp->fc_flags |= FCP_CFL_WRDATA;
 233
 234         memcpy(fcp->fc_cdb, scsi->cmnd, scsi->cmd_len);
 235
 236         datalen = scsi_bufflen(scsi);
 237         fcp->fc_dl = cpu_to_be32(datalen);
 238
 239         if (scsi_get_prot_type(scsi) == SCSI_PROT_DIF_TYPE1) {
 240                 datalen += datalen / scsi->device->sector_size * 8;
 241                 fcp->fc_dl = cpu_to_be32(datalen);
 242         }
 243 }
 244
 245 /**
 246  * zfcp_fc_evap_fcp_rsp - evaluate FCP RSP IU and update scsi_cmnd accordingly
 247  * @fcp_rsp: FCP RSP IU to evaluate
 248  * @scsi: SCSI command where to update status and sense buffer
 249  */
 250 static inline
 251 void zfcp_fc_eval_fcp_rsp(struct fcp_resp_with_ext *fcp_rsp,
 252                           struct scsi_cmnd *scsi)
 253 {
 254         struct fcp_resp_rsp_info *rsp_info;
 255         char *sense;
 256         u32 sense_len, resid;
 257         u8 rsp_flags;
 258
 259         set_msg_byte(scsi, COMMAND_COMPLETE);
 260         scsi->result |= fcp_rsp->resp.fr_status;
 261
 262         rsp_flags = fcp_rsp->resp.fr_flags;
 263
 264         if (unlikely(rsp_flags & FCP_RSP_LEN_VAL)) {
 265                 rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
 266                 if (rsp_info->rsp_code == FCP_TMF_CMPL)
 267                         set_host_byte(scsi, DID_OK);
 268                 else {
 269                         set_host_byte(scsi, DID_ERROR);
 270                         return;
 271                 }
 272         }
 273
 274         if (unlikely(rsp_flags & FCP_SNS_LEN_VAL)) {
 275                 sense = (char *) &fcp_rsp[1];
 276                 if (rsp_flags & FCP_RSP_LEN_VAL)
 277                         sense += be32_to_cpu(fcp_rsp->ext.fr_rsp_len);
 278                 sense_len = min_t(u32, be32_to_cpu(fcp_rsp->ext.fr_sns_len),
 279                                   SCSI_SENSE_BUFFERSIZE);
 280                 memcpy(scsi->sense_buffer, sense, sense_len);
 281         }
 282
 283         if (unlikely(rsp_flags & FCP_RESID_UNDER)) {
 284                 resid = be32_to_cpu(fcp_rsp->ext.fr_resid);
 285                 scsi_set_resid(scsi, resid);
 286                 if (scsi_bufflen(scsi) - resid < scsi->underflow &&
 287                      !(rsp_flags & FCP_SNS_LEN_VAL) &&
 288                      fcp_rsp->resp.fr_status == SAM_STAT_GOOD)
 289                         set_host_byte(scsi, DID_ERROR);
 290         } else if (unlikely(rsp_flags & FCP_RESID_OVER)) {
 291                 /* FCP_DL was not sufficient for SCSI data length */
 292                 if (fcp_rsp->resp.fr_status == SAM_STAT_GOOD)
 293                         set_host_byte(scsi, DID_ERROR);
 294         }
 295 }
 296
 297 #endif