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