drivers/s390/scsi/zfcp_fc.h

   1 /*
   2  * zfcp device driver
   3  *
   4  * Fibre Channel related definitions and inline functions for the zfcp
   5  * device driver
   6  *
   7  * Copyright IBM Corporation 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_gid_pn_req - container for ct header plus gid_pn request
  34  * @ct_hdr: FC GS common transport header
  35  * @gid_pn: GID_PN request
  36  */
  37 struct zfcp_fc_gid_pn_req {
  38         struct fc_ct_hdr        ct_hdr;
  39         struct fc_ns_gid_pn     gid_pn;
  40 } __packed;
  41
  42 /**
  43  * struct zfcp_fc_gid_pn_resp - container for ct header plus gid_pn response
  44  * @ct_hdr: FC GS common transport header
  45  * @gid_pn: GID_PN response
  46  */
  47 struct zfcp_fc_gid_pn_resp {
  48         struct fc_ct_hdr        ct_hdr;
  49         struct fc_gid_pn_resp   gid_pn;
  50 } __packed;
  51
  52 /**
  53  * struct zfcp_fc_gid_pn - everything required in zfcp for gid_pn request
  54  * @ct: data passed to zfcp_fsf for issuing fsf request
  55  * @sg_req: scatterlist entry for request data
  56  * @sg_resp: scatterlist entry for response data
  57  * @gid_pn_req: GID_PN request data
  58  * @gid_pn_resp: GID_PN response data
  59  */
  60 struct zfcp_fc_gid_pn {
  61         struct zfcp_fsf_ct_els ct;
  62         struct scatterlist sg_req;
  63         struct scatterlist sg_resp;
  64         struct zfcp_fc_gid_pn_req gid_pn_req;
  65         struct zfcp_fc_gid_pn_resp gid_pn_resp;
  66         struct zfcp_port *port;
  67 };
  68
  69 /**
  70  * struct zfcp_fc_gpn_ft - container for ct header plus gpn_ft request
  71  * @ct_hdr: FC GS common transport header
  72  * @gpn_ft: GPN_FT request
  73  */
  74 struct zfcp_fc_gpn_ft_req {
  75         struct fc_ct_hdr        ct_hdr;
  76         struct fc_ns_gid_ft     gpn_ft;
  77 } __packed;
  78
  79 /**
  80  * struct zfcp_fc_gpn_ft_resp - container for ct header plus gpn_ft response
  81  * @ct_hdr: FC GS common transport header
  82  * @gpn_ft: Array of gpn_ft response data to fill one memory page
  83  */
  84 struct zfcp_fc_gpn_ft_resp {
  85         struct fc_ct_hdr        ct_hdr;
  86         struct fc_gpn_ft_resp   gpn_ft[ZFCP_FC_GPN_FT_ENT_PAGE];
  87 } __packed;
  88
  89 /**
  90  * struct zfcp_fc_gpn_ft - zfcp data for gpn_ft request
  91  * @ct: data passed to zfcp_fsf for issuing fsf request
  92  * @sg_req: scatter list entry for gpn_ft request
  93  * @sg_resp: scatter list entries for gpn_ft responses (per memory page)
  94  */
  95 struct zfcp_fc_gpn_ft {
  96         struct zfcp_fsf_ct_els ct;
  97         struct scatterlist sg_req;
  98         struct scatterlist sg_resp[ZFCP_FC_GPN_FT_NUM_BUFS];
  99 };
 100
 101 /**
 102  * struct zfcp_fc_els_adisc - everything required in zfcp for issuing ELS ADISC
 103  * @els: data required for issuing els fsf command
 104  * @req: scatterlist entry for ELS ADISC request
 105  * @resp: scatterlist entry for ELS ADISC response
 106  * @adisc_req: ELS ADISC request data
 107  * @adisc_resp: ELS ADISC response data
 108  */
 109 struct zfcp_fc_els_adisc {
 110         struct zfcp_fsf_ct_els els;
 111         struct scatterlist req;
 112         struct scatterlist resp;
 113         struct fc_els_adisc adisc_req;
 114         struct fc_els_adisc adisc_resp;
 115 };
 116
 117 /**
 118  * enum zfcp_fc_wka_status - FC WKA port status in zfcp
 119  * @ZFCP_FC_WKA_PORT_OFFLINE: Port is closed and not in use
 120  * @ZFCP_FC_WKA_PORT_CLOSING: The FSF "close port" request is pending
 121  * @ZFCP_FC_WKA_PORT_OPENING: The FSF "open port" request is pending
 122  * @ZFCP_FC_WKA_PORT_ONLINE: The port is open and the port handle is valid
 123  */
 124 enum zfcp_fc_wka_status {
 125         ZFCP_FC_WKA_PORT_OFFLINE,
 126         ZFCP_FC_WKA_PORT_CLOSING,
 127         ZFCP_FC_WKA_PORT_OPENING,
 128         ZFCP_FC_WKA_PORT_ONLINE,
 129 };
 130
 131 /**
 132  * struct zfcp_fc_wka_port - representation of well-known-address (WKA) FC port
 133  * @adapter: Pointer to adapter structure this WKA port belongs to
 134  * @completion_wq: Wait for completion of open/close command
 135  * @status: Current status of WKA port
 136  * @refcount: Reference count to keep port open as long as it is in use
 137  * @d_id: FC destination id or well-known-address
 138  * @handle: FSF handle for the open WKA port
 139  * @mutex: Mutex used during opening/closing state changes
 140  * @work: For delaying the closing of the WKA port
 141  */
 142 struct zfcp_fc_wka_port {
 143         struct zfcp_adapter     *adapter;
 144         wait_queue_head_t       completion_wq;
 145         enum zfcp_fc_wka_status status;
 146         atomic_t                refcount;
 147         u32                     d_id;
 148         u32                     handle;
 149         struct mutex            mutex;
 150         struct delayed_work     work;
 151 };
 152
 153 /**
 154  * struct zfcp_fc_wka_ports - Data structures for FC generic services
 155  * @ms: FC Management service
 156  * @ts: FC time service
 157  * @ds: FC directory service
 158  * @as: FC alias service
 159  */
 160 struct zfcp_fc_wka_ports {
 161         struct zfcp_fc_wka_port ms;
 162         struct zfcp_fc_wka_port ts;
 163         struct zfcp_fc_wka_port ds;
 164         struct zfcp_fc_wka_port as;
 165 };
 166
 167 /**
 168  * zfcp_fc_scsi_to_fcp - setup FCP command with data from scsi_cmnd
 169  * @fcp: fcp_cmnd to setup
 170  * @scsi: scsi_cmnd where to get LUN, task attributes/flags and CDB
 171  */
 172 static inline
 173 void zfcp_fc_scsi_to_fcp(struct fcp_cmnd *fcp, struct scsi_cmnd *scsi)
 174 {
 175         char tag[2];
 176
 177         int_to_scsilun(scsi->device->lun, (struct scsi_lun *) &fcp->fc_lun);
 178
 179         if (scsi_populate_tag_msg(scsi, tag)) {
 180                 switch (tag[0]) {
 181                 case MSG_ORDERED_TAG:
 182                         fcp->fc_pri_ta |= FCP_PTA_ORDERED;
 183                         break;
 184                 case MSG_SIMPLE_TAG:
 185                         fcp->fc_pri_ta |= FCP_PTA_SIMPLE;
 186                         break;
 187                 };
 188         } else
 189                 fcp->fc_pri_ta = FCP_PTA_SIMPLE;
 190
 191         if (scsi->sc_data_direction == DMA_FROM_DEVICE)
 192                 fcp->fc_flags |= FCP_CFL_RDDATA;
 193         if (scsi->sc_data_direction == DMA_TO_DEVICE)
 194                 fcp->fc_flags |= FCP_CFL_WRDATA;
 195
 196         memcpy(fcp->fc_cdb, scsi->cmnd, scsi->cmd_len);
 197
 198         fcp->fc_dl = scsi_bufflen(scsi);
 199 }
 200
 201 /**
 202  * zfcp_fc_fcp_tm - setup FCP command as task management command
 203  * @fcp: fcp_cmnd to setup
 204  * @dev: scsi_device where to send the task management command
 205  * @tm: task management flags to setup tm command
 206  */
 207 static inline
 208 void zfcp_fc_fcp_tm(struct fcp_cmnd *fcp, struct scsi_device *dev, u8 tm_flags)
 209 {
 210         int_to_scsilun(dev->lun, (struct scsi_lun *) &fcp->fc_lun);
 211         fcp->fc_tm_flags |= tm_flags;
 212 }
 213
 214 /**
 215  * zfcp_fc_evap_fcp_rsp - evaluate FCP RSP IU and update scsi_cmnd accordingly
 216  * @fcp_rsp: FCP RSP IU to evaluate
 217  * @scsi: SCSI command where to update status and sense buffer
 218  */
 219 static inline
 220 void zfcp_fc_eval_fcp_rsp(struct fcp_resp_with_ext *fcp_rsp,
 221                           struct scsi_cmnd *scsi)
 222 {
 223         struct fcp_resp_rsp_info *rsp_info;
 224         char *sense;
 225         u32 sense_len, resid;
 226         u8 rsp_flags;
 227
 228         set_msg_byte(scsi, COMMAND_COMPLETE);
 229         scsi->result |= fcp_rsp->resp.fr_status;
 230
 231         rsp_flags = fcp_rsp->resp.fr_flags;
 232
 233         if (unlikely(rsp_flags & FCP_RSP_LEN_VAL)) {
 234                 rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
 235                 if (rsp_info->rsp_code == FCP_TMF_CMPL)
 236                         set_host_byte(scsi, DID_OK);
 237                 else {
 238                         set_host_byte(scsi, DID_ERROR);
 239                         return;
 240                 }
 241         }
 242
 243         if (unlikely(rsp_flags & FCP_SNS_LEN_VAL)) {
 244                 sense = (char *) &fcp_rsp[1];
 245                 if (rsp_flags & FCP_RSP_LEN_VAL)
 246                         sense += fcp_rsp->ext.fr_sns_len;
 247                 sense_len = min(fcp_rsp->ext.fr_sns_len,
 248                                 (u32) SCSI_SENSE_BUFFERSIZE);
 249                 memcpy(scsi->sense_buffer, sense, sense_len);
 250         }
 251
 252         if (unlikely(rsp_flags & FCP_RESID_UNDER)) {
 253                 resid = fcp_rsp->ext.fr_resid;
 254                 scsi_set_resid(scsi, resid);
 255                 if (scsi_bufflen(scsi) - resid < scsi->underflow &&
 256                      !(rsp_flags & FCP_SNS_LEN_VAL) &&
 257                      fcp_rsp->resp.fr_status == SAM_STAT_GOOD)
 258                         set_host_byte(scsi, DID_ERROR);
 259         }
 260 }
 261
 262 #endif