include/scsi/fc_encode.h

   1 /*
   2  * Copyright(c) 2008 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  * Maintained at www.Open-FCoE.org
  18  */
  19
  20 #ifndef _FC_ENCODE_H_
  21 #define _FC_ENCODE_H_
  22 #include <asm/unaligned.h>
  23
  24 /*
  25  * F_CTL values for simple requests and responses.
  26  */
  27 #define FC_FCTL_REQ     (FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT)
  28 #define FC_FCTL_RESP    (FC_FC_EX_CTX | FC_FC_LAST_SEQ | \
  29                         FC_FC_END_SEQ | FC_FC_SEQ_INIT)
  30
  31 struct fc_ns_rft {
  32         struct fc_ns_fid fid;   /* port ID object */
  33         struct fc_ns_fts fts;   /* FC4-types object */
  34 };
  35
  36 struct fc_ct_req {
  37         struct fc_ct_hdr hdr;
  38         union {
  39                 struct fc_ns_gid_ft gid;
  40                 struct fc_ns_rn_id  rn;
  41                 struct fc_ns_rft rft;
  42                 struct fc_ns_rff_id rff;
  43                 struct fc_ns_fid fid;
  44                 struct fc_ns_rsnn snn;
  45                 struct fc_ns_rspn spn;
  46         } payload;
  47 };
  48
  49 static inline void __fc_fill_fc_hdr(struct fc_frame_header *fh,
  50                                     enum fc_rctl r_ctl,
  51                                     u32 did, u32 sid, enum fc_fh_type type,
  52                                     u32 f_ctl, u32 parm_offset)
  53 {
  54         WARN_ON(r_ctl == 0);
  55         fh->fh_r_ctl = r_ctl;
  56         hton24(fh->fh_d_id, did);
  57         hton24(fh->fh_s_id, sid);
  58         fh->fh_type = type;
  59         hton24(fh->fh_f_ctl, f_ctl);
  60         fh->fh_cs_ctl = 0;
  61         fh->fh_df_ctl = 0;
  62         fh->fh_parm_offset = htonl(parm_offset);
  63 }
  64
  65 /**
  66  * fill FC header fields in specified fc_frame
  67  */
  68 static inline void fc_fill_fc_hdr(struct fc_frame *fp, enum fc_rctl r_ctl,
  69                                   u32 did, u32 sid, enum fc_fh_type type,
  70                                   u32 f_ctl, u32 parm_offset)
  71 {
  72         struct fc_frame_header *fh;
  73
  74         fh = fc_frame_header_get(fp);
  75         __fc_fill_fc_hdr(fh, r_ctl, did, sid, type, f_ctl, parm_offset);
  76 }
  77
  78 /**
  79  * fc_adisc_fill() - Fill in adisc request frame
  80  * @lport: local port.
  81  * @fp: fc frame where payload will be placed.
  82  */
  83 static inline void fc_adisc_fill(struct fc_lport *lport, struct fc_frame *fp)
  84 {
  85         struct fc_els_adisc *adisc;
  86
  87         adisc = fc_frame_payload_get(fp, sizeof(*adisc));
  88         memset(adisc, 0, sizeof(*adisc));
  89         adisc->adisc_cmd = ELS_ADISC;
  90         put_unaligned_be64(lport->wwpn, &adisc->adisc_wwpn);
  91         put_unaligned_be64(lport->wwnn, &adisc->adisc_wwnn);
  92         hton24(adisc->adisc_port_id, lport->port_id);
  93 }
  94
  95 /**
  96  * fc_ct_hdr_fill- fills ct header and reset ct payload
  97  * returns pointer to ct request.
  98  */
  99 static inline struct fc_ct_req *fc_ct_hdr_fill(const struct fc_frame *fp,
 100                                                unsigned int op, size_t req_size)
 101 {
 102         struct fc_ct_req *ct;
 103         size_t ct_plen;
 104
 105         ct_plen  = sizeof(struct fc_ct_hdr) + req_size;
 106         ct = fc_frame_payload_get(fp, ct_plen);
 107         memset(ct, 0, ct_plen);
 108         ct->hdr.ct_rev = FC_CT_REV;
 109         ct->hdr.ct_fs_type = FC_FST_DIR;
 110         ct->hdr.ct_fs_subtype = FC_NS_SUBTYPE;
 111         ct->hdr.ct_cmd = htons((u16) op);
 112         return ct;
 113 }
 114
 115 /**
 116  * fc_ct_fill() - Fill in a name service request frame
 117  * @lport: local port.
 118  * @fc_id: FC_ID of non-destination rport for GPN_ID and similar inquiries.
 119  * @fp: frame to contain payload.
 120  * @op: CT opcode.
 121  * @r_ctl: pointer to FC header R_CTL.
 122  * @fh_type: pointer to FC-4 type.
 123  */
 124 static inline int fc_ct_fill(struct fc_lport *lport,
 125                       u32 fc_id, struct fc_frame *fp,
 126                       unsigned int op, enum fc_rctl *r_ctl,
 127                       enum fc_fh_type *fh_type)
 128 {
 129         struct fc_ct_req *ct;
 130         size_t len;
 131
 132         switch (op) {
 133         case FC_NS_GPN_FT:
 134                 ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_gid_ft));
 135                 ct->payload.gid.fn_fc4_type = FC_TYPE_FCP;
 136                 break;
 137
 138         case FC_NS_GPN_ID:
 139                 ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_fid));
 140                 hton24(ct->payload.fid.fp_fid, fc_id);
 141                 break;
 142
 143         case FC_NS_RFT_ID:
 144                 ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rft));
 145                 hton24(ct->payload.rft.fid.fp_fid, lport->port_id);
 146                 ct->payload.rft.fts = lport->fcts;
 147                 break;
 148
 149         case FC_NS_RFF_ID:
 150                 ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rff_id));
 151                 hton24(ct->payload.rff.fr_fid.fp_fid, lport->port_id);
 152                 ct->payload.rff.fr_type = FC_TYPE_FCP;
 153                 if (lport->service_params & FCP_SPPF_INIT_FCN)
 154                         ct->payload.rff.fr_feat = FCP_FEAT_INIT;
 155                 if (lport->service_params & FCP_SPPF_TARG_FCN)
 156                         ct->payload.rff.fr_feat |= FCP_FEAT_TARG;
 157                 break;
 158
 159         case FC_NS_RNN_ID:
 160                 ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rn_id));
 161                 hton24(ct->payload.rn.fr_fid.fp_fid, lport->port_id);
 162                 put_unaligned_be64(lport->wwnn, &ct->payload.rn.fr_wwn);
 163                 break;
 164
 165         case FC_NS_RSPN_ID:
 166                 len = strnlen(fc_host_symbolic_name(lport->host), 255);
 167                 ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rspn) + len);
 168                 hton24(ct->payload.spn.fr_fid.fp_fid, lport->port_id);
 169                 strncpy(ct->payload.spn.fr_name,
 170                         fc_host_symbolic_name(lport->host), len);
 171                 ct->payload.spn.fr_name_len = len;
 172                 break;
 173
 174         case FC_NS_RSNN_NN:
 175                 len = strnlen(fc_host_symbolic_name(lport->host), 255);
 176                 ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rsnn) + len);
 177                 put_unaligned_be64(lport->wwnn, &ct->payload.snn.fr_wwn);
 178                 strncpy(ct->payload.snn.fr_name,
 179                         fc_host_symbolic_name(lport->host), len);
 180                 ct->payload.snn.fr_name_len = len;
 181                 break;
 182
 183         default:
 184                 return -EINVAL;
 185         }
 186         *r_ctl = FC_RCTL_DD_UNSOL_CTL;
 187         *fh_type = FC_TYPE_CT;
 188         return 0;
 189 }
 190
 191 /**
 192  * fc_plogi_fill - Fill in plogi request frame
 193  */
 194 static inline void fc_plogi_fill(struct fc_lport *lport, struct fc_frame *fp,
 195                                  unsigned int op)
 196 {
 197         struct fc_els_flogi *plogi;
 198         struct fc_els_csp *csp;
 199         struct fc_els_cssp *cp;
 200
 201         plogi = fc_frame_payload_get(fp, sizeof(*plogi));
 202         memset(plogi, 0, sizeof(*plogi));
 203         plogi->fl_cmd = (u8) op;
 204         put_unaligned_be64(lport->wwpn, &plogi->fl_wwpn);
 205         put_unaligned_be64(lport->wwnn, &plogi->fl_wwnn);
 206
 207         csp = &plogi->fl_csp;
 208         csp->sp_hi_ver = 0x20;
 209         csp->sp_lo_ver = 0x20;
 210         csp->sp_bb_cred = htons(10);    /* this gets set by gateway */
 211         csp->sp_bb_data = htons((u16) lport->mfs);
 212         cp = &plogi->fl_cssp[3 - 1];    /* class 3 parameters */
 213         cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
 214         csp->sp_features = htons(FC_SP_FT_CIRO);
 215         csp->sp_tot_seq = htons(255);   /* seq. we accept */
 216         csp->sp_rel_off = htons(0x1f);
 217         csp->sp_e_d_tov = htonl(lport->e_d_tov);
 218
 219         cp->cp_rdfs = htons((u16) lport->mfs);
 220         cp->cp_con_seq = htons(255);
 221         cp->cp_open_seq = 1;
 222 }
 223
 224 /**
 225  * fc_flogi_fill - Fill in a flogi request frame.
 226  */
 227 static inline void fc_flogi_fill(struct fc_lport *lport, struct fc_frame *fp)
 228 {
 229         struct fc_els_csp *sp;
 230         struct fc_els_cssp *cp;
 231         struct fc_els_flogi *flogi;
 232
 233         flogi = fc_frame_payload_get(fp, sizeof(*flogi));
 234         memset(flogi, 0, sizeof(*flogi));
 235         flogi->fl_cmd = (u8) ELS_FLOGI;
 236         put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn);
 237         put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn);
 238         sp = &flogi->fl_csp;
 239         sp->sp_hi_ver = 0x20;
 240         sp->sp_lo_ver = 0x20;
 241         sp->sp_bb_cred = htons(10);     /* this gets set by gateway */
 242         sp->sp_bb_data = htons((u16) lport->mfs);
 243         cp = &flogi->fl_cssp[3 - 1];    /* class 3 parameters */
 244         cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
 245         if (lport->does_npiv)
 246                 sp->sp_features = htons(FC_SP_FT_NPIV);
 247 }
 248
 249 /**
 250  * fc_fdisc_fill - Fill in a fdisc request frame.
 251  */
 252 static inline void fc_fdisc_fill(struct fc_lport *lport, struct fc_frame *fp)
 253 {
 254         struct fc_els_csp *sp;
 255         struct fc_els_cssp *cp;
 256         struct fc_els_flogi *fdisc;
 257
 258         fdisc = fc_frame_payload_get(fp, sizeof(*fdisc));
 259         memset(fdisc, 0, sizeof(*fdisc));
 260         fdisc->fl_cmd = (u8) ELS_FDISC;
 261         put_unaligned_be64(lport->wwpn, &fdisc->fl_wwpn);
 262         put_unaligned_be64(lport->wwnn, &fdisc->fl_wwnn);
 263         sp = &fdisc->fl_csp;
 264         sp->sp_hi_ver = 0x20;
 265         sp->sp_lo_ver = 0x20;
 266         sp->sp_bb_cred = htons(10);     /* this gets set by gateway */
 267         sp->sp_bb_data = htons((u16) lport->mfs);
 268         cp = &fdisc->fl_cssp[3 - 1];    /* class 3 parameters */
 269         cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
 270 }
 271
 272 /**
 273  * fc_logo_fill - Fill in a logo request frame.
 274  */
 275 static inline void fc_logo_fill(struct fc_lport *lport, struct fc_frame *fp)
 276 {
 277         struct fc_els_logo *logo;
 278
 279         logo = fc_frame_payload_get(fp, sizeof(*logo));
 280         memset(logo, 0, sizeof(*logo));
 281         logo->fl_cmd = ELS_LOGO;
 282         hton24(logo->fl_n_port_id, lport->port_id);
 283         logo->fl_n_port_wwn = htonll(lport->wwpn);
 284 }
 285
 286 /**
 287  * fc_rtv_fill - Fill in RTV (read timeout value) request frame.
 288  */
 289 static inline void fc_rtv_fill(struct fc_lport *lport, struct fc_frame *fp)
 290 {
 291         struct fc_els_rtv *rtv;
 292
 293         rtv = fc_frame_payload_get(fp, sizeof(*rtv));
 294         memset(rtv, 0, sizeof(*rtv));
 295         rtv->rtv_cmd = ELS_RTV;
 296 }
 297
 298 /**
 299  * fc_rec_fill - Fill in rec request frame
 300  */
 301 static inline void fc_rec_fill(struct fc_lport *lport, struct fc_frame *fp)
 302 {
 303         struct fc_els_rec *rec;
 304         struct fc_exch *ep = fc_seq_exch(fr_seq(fp));
 305
 306         rec = fc_frame_payload_get(fp, sizeof(*rec));
 307         memset(rec, 0, sizeof(*rec));
 308         rec->rec_cmd = ELS_REC;
 309         hton24(rec->rec_s_id, lport->port_id);
 310         rec->rec_ox_id = htons(ep->oxid);
 311         rec->rec_rx_id = htons(ep->rxid);
 312 }
 313
 314 /**
 315  * fc_prli_fill - Fill in prli request frame
 316  */
 317 static inline void fc_prli_fill(struct fc_lport *lport, struct fc_frame *fp)
 318 {
 319         struct {
 320                 struct fc_els_prli prli;
 321                 struct fc_els_spp spp;
 322         } *pp;
 323
 324         pp = fc_frame_payload_get(fp, sizeof(*pp));
 325         memset(pp, 0, sizeof(*pp));
 326         pp->prli.prli_cmd = ELS_PRLI;
 327         pp->prli.prli_spp_len = sizeof(struct fc_els_spp);
 328         pp->prli.prli_len = htons(sizeof(*pp));
 329         pp->spp.spp_type = FC_TYPE_FCP;
 330         pp->spp.spp_flags = FC_SPP_EST_IMG_PAIR;
 331         pp->spp.spp_params = htonl(lport->service_params);
 332 }
 333
 334 /**
 335  * fc_scr_fill - Fill in a scr request frame.
 336  */
 337 static inline void fc_scr_fill(struct fc_lport *lport, struct fc_frame *fp)
 338 {
 339         struct fc_els_scr *scr;
 340
 341         scr = fc_frame_payload_get(fp, sizeof(*scr));
 342         memset(scr, 0, sizeof(*scr));
 343         scr->scr_cmd = ELS_SCR;
 344         scr->scr_reg_func = ELS_SCRF_FULL;
 345 }
 346
 347 /**
 348  * fc_els_fill - Fill in an ELS  request frame
 349  */
 350 static inline int fc_els_fill(struct fc_lport *lport,
 351                        u32 did,
 352                        struct fc_frame *fp, unsigned int op,
 353                        enum fc_rctl *r_ctl, enum fc_fh_type *fh_type)
 354 {
 355         switch (op) {
 356         case ELS_ADISC:
 357                 fc_adisc_fill(lport, fp);
 358                 break;
 359
 360         case ELS_PLOGI:
 361                 fc_plogi_fill(lport, fp, ELS_PLOGI);
 362                 break;
 363
 364         case ELS_FLOGI:
 365                 fc_flogi_fill(lport, fp);
 366                 break;
 367
 368         case ELS_FDISC:
 369                 fc_fdisc_fill(lport, fp);
 370                 break;
 371
 372         case ELS_LOGO:
 373                 fc_logo_fill(lport, fp);
 374                 break;
 375
 376         case ELS_RTV:
 377                 fc_rtv_fill(lport, fp);
 378                 break;
 379
 380         case ELS_REC:
 381                 fc_rec_fill(lport, fp);
 382                 break;
 383
 384         case ELS_PRLI:
 385                 fc_prli_fill(lport, fp);
 386                 break;
 387
 388         case ELS_SCR:
 389                 fc_scr_fill(lport, fp);
 390                 break;
 391
 392         default:
 393                 return -EINVAL;
 394         }
 395
 396         *r_ctl = FC_RCTL_ELS_REQ;
 397         *fh_type = FC_TYPE_ELS;
 398         return 0;
 399 }
 400 #endif /* _FC_ENCODE_H_ */