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