net/caif/cfcnfg.c

   1 /*
   2  * Copyright (C) ST-Ericsson AB 2010
   3  * Author:      Sjur Brendeland/sjur.brandeland@stericsson.com
   4  * License terms: GNU General Public License (GPL) version 2
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
   8
   9 #include <linux/kernel.h>
  10 #include <linux/stddef.h>
  11 #include <linux/slab.h>
  12 #include <linux/netdevice.h>
  13 #include <net/caif/caif_layer.h>
  14 #include <net/caif/cfpkt.h>
  15 #include <net/caif/cfcnfg.h>
  16 #include <net/caif/cfctrl.h>
  17 #include <net/caif/cfmuxl.h>
  18 #include <net/caif/cffrml.h>
  19 #include <net/caif/cfserl.h>
  20 #include <net/caif/cfsrvl.h>
  21
  22 #include <linux/module.h>
  23 #include <asm/atomic.h>
  24
  25 #define MAX_PHY_LAYERS 7
  26
  27 #define container_obj(layr) container_of(layr, struct cfcnfg, layer)
  28
  29 /* Information about CAIF physical interfaces held by Config Module in order
  30  * to manage physical interfaces
  31  */
  32 struct cfcnfg_phyinfo {
  33         /* Pointer to the layer below the MUX (framing layer) */
  34         struct cflayer *frm_layer;
  35         /* Pointer to the lowest actual physical layer */
  36         struct cflayer *phy_layer;
  37         /* Unique identifier of the physical interface */
  38         unsigned int id;
  39         /* Preference of the physical in interface */
  40         enum cfcnfg_phy_preference pref;
  41
  42         /* Reference count, number of channels using the device */
  43         int phy_ref_count;
  44
  45         /* Information about the physical device */
  46         struct dev_info dev_info;
  47
  48         /* Interface index */
  49         int ifindex;
  50
  51         /* Use Start of frame extension */
  52         bool use_stx;
  53
  54         /* Use Start of frame checksum */
  55         bool use_fcs;
  56 };
  57
  58 struct cfcnfg {
  59         struct cflayer layer;
  60         struct cflayer *ctrl;
  61         struct cflayer *mux;
  62         u8 last_phyid;
  63         struct cfcnfg_phyinfo phy_layers[MAX_PHY_LAYERS];
  64 };
  65
  66 static void cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id,
  67                              enum cfctrl_srv serv, u8 phyid,
  68                              struct cflayer *adapt_layer);
  69 static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id);
  70 static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
  71                              struct cflayer *adapt_layer);
  72 static void cfctrl_resp_func(void);
  73 static void cfctrl_enum_resp(void);
  74
  75 struct cfcnfg *cfcnfg_create(void)
  76 {
  77         struct cfcnfg *this;
  78         struct cfctrl_rsp *resp;
  79         /* Initiate this layer */
  80         this = kzalloc(sizeof(struct cfcnfg), GFP_ATOMIC);
  81         if (!this) {
  82                 pr_warn("Out of memory\n");
  83                 return NULL;
  84         }
  85         this->mux = cfmuxl_create();
  86         if (!this->mux)
  87                 goto out_of_mem;
  88         this->ctrl = cfctrl_create();
  89         if (!this->ctrl)
  90                 goto out_of_mem;
  91         /* Initiate response functions */
  92         resp = cfctrl_get_respfuncs(this->ctrl);
  93         resp->enum_rsp = cfctrl_enum_resp;
  94         resp->linkerror_ind = cfctrl_resp_func;
  95         resp->linkdestroy_rsp = cfcnfg_linkdestroy_rsp;
  96         resp->sleep_rsp = cfctrl_resp_func;
  97         resp->wake_rsp = cfctrl_resp_func;
  98         resp->restart_rsp = cfctrl_resp_func;
  99         resp->radioset_rsp = cfctrl_resp_func;
 100         resp->linksetup_rsp = cfcnfg_linkup_rsp;
 101         resp->reject_rsp = cfcnfg_reject_rsp;
 102
 103         this->last_phyid = 1;
 104
 105         cfmuxl_set_uplayer(this->mux, this->ctrl, 0);
 106         layer_set_dn(this->ctrl, this->mux);
 107         layer_set_up(this->ctrl, this);
 108         return this;
 109 out_of_mem:
 110         pr_warn("Out of memory\n");
 111         kfree(this->mux);
 112         kfree(this->ctrl);
 113         kfree(this);
 114         return NULL;
 115 }
 116 EXPORT_SYMBOL(cfcnfg_create);
 117
 118 void cfcnfg_remove(struct cfcnfg *cfg)
 119 {
 120         if (cfg) {
 121                 kfree(cfg->mux);
 122                 kfree(cfg->ctrl);
 123                 kfree(cfg);
 124         }
 125 }
 126
 127 static void cfctrl_resp_func(void)
 128 {
 129 }
 130
 131 static void cfctrl_enum_resp(void)
 132 {
 133 }
 134
 135 struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg,
 136                                   enum cfcnfg_phy_preference phy_pref)
 137 {
 138         u16 i;
 139
 140         /* Try to match with specified preference */
 141         for (i = 1; i < MAX_PHY_LAYERS; i++) {
 142                 if (cnfg->phy_layers[i].id == i &&
 143                      cnfg->phy_layers[i].pref == phy_pref &&
 144                      cnfg->phy_layers[i].frm_layer != NULL) {
 145                         caif_assert(cnfg->phy_layers != NULL);
 146                         caif_assert(cnfg->phy_layers[i].id == i);
 147                         return &cnfg->phy_layers[i].dev_info;
 148                 }
 149         }
 150         /* Otherwise just return something */
 151         for (i = 1; i < MAX_PHY_LAYERS; i++) {
 152                 if (cnfg->phy_layers[i].id == i) {
 153                         caif_assert(cnfg->phy_layers != NULL);
 154                         caif_assert(cnfg->phy_layers[i].id == i);
 155                         return &cnfg->phy_layers[i].dev_info;
 156                 }
 157         }
 158
 159         return NULL;
 160 }
 161
 162 static struct cfcnfg_phyinfo *cfcnfg_get_phyinfo(struct cfcnfg *cnfg,
 163                                                         u8 phyid)
 164 {
 165         int i;
 166         /* Try to match with specified preference */
 167         for (i = 0; i < MAX_PHY_LAYERS; i++)
 168                 if (cnfg->phy_layers[i].frm_layer != NULL &&
 169                     cnfg->phy_layers[i].id == phyid)
 170                         return &cnfg->phy_layers[i];
 171         return NULL;
 172 }
 173
 174
 175 int cfcnfg_get_id_from_ifi(struct cfcnfg *cnfg, int ifi)
 176 {
 177         int i;
 178         for (i = 0; i < MAX_PHY_LAYERS; i++)
 179                 if (cnfg->phy_layers[i].frm_layer != NULL &&
 180                                 cnfg->phy_layers[i].ifindex == ifi)
 181                         return i;
 182         return -ENODEV;
 183 }
 184
 185 int cfcnfg_disconn_adapt_layer(struct cfcnfg *cnfg, struct cflayer *adap_layer)
 186 {
 187         u8 channel_id = 0;
 188         int ret = 0;
 189         struct cflayer *servl = NULL;
 190         struct cfcnfg_phyinfo *phyinfo = NULL;
 191         u8 phyid = 0;
 192
 193         caif_assert(adap_layer != NULL);
 194         channel_id = adap_layer->id;
 195         if (adap_layer->dn == NULL || channel_id == 0) {
 196                 pr_err("adap_layer->dn == NULL or adap_layer->id is 0\n");
 197                 ret = -ENOTCONN;
 198                 goto end;
 199         }
 200         servl = cfmuxl_remove_uplayer(cnfg->mux, channel_id);
 201         if (servl == NULL) {
 202                 pr_err("PROTOCOL ERROR - Error removing service_layer Channel_Id(%d)",
 203                        channel_id);
 204                 ret = -EINVAL;
 205                 goto end;
 206         }
 207         layer_set_up(servl, NULL);
 208         ret = cfctrl_linkdown_req(cnfg->ctrl, channel_id, adap_layer);
 209         if (ret)
 210                 goto end;
 211         caif_assert(channel_id == servl->id);
 212         if (adap_layer->dn != NULL) {
 213                 phyid = cfsrvl_getphyid(adap_layer->dn);
 214
 215                 phyinfo = cfcnfg_get_phyinfo(cnfg, phyid);
 216                 if (phyinfo == NULL) {
 217                         pr_warn("No interface to send disconnect to\n");
 218                         ret = -ENODEV;
 219                         goto end;
 220                 }
 221                 if (phyinfo->id != phyid ||
 222                         phyinfo->phy_layer->id != phyid ||
 223                         phyinfo->frm_layer->id != phyid) {
 224                         pr_err("Inconsistency in phy registration\n");
 225                         ret = -EINVAL;
 226                         goto end;
 227                 }
 228         }
 229         if (phyinfo != NULL && --phyinfo->phy_ref_count == 0 &&
 230                 phyinfo->phy_layer != NULL &&
 231                 phyinfo->phy_layer->modemcmd != NULL) {
 232                 phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
 233                                              _CAIF_MODEMCMD_PHYIF_USELESS);
 234         }
 235 end:
 236         cfsrvl_put(servl);
 237         cfctrl_cancel_req(cnfg->ctrl, adap_layer);
 238         if (adap_layer->ctrlcmd != NULL)
 239                 adap_layer->ctrlcmd(adap_layer, CAIF_CTRLCMD_DEINIT_RSP, 0);
 240         return ret;
 241
 242 }
 243 EXPORT_SYMBOL(cfcnfg_disconn_adapt_layer);
 244
 245 void cfcnfg_release_adap_layer(struct cflayer *adap_layer)
 246 {
 247         if (adap_layer->dn)
 248                 cfsrvl_put(adap_layer->dn);
 249 }
 250 EXPORT_SYMBOL(cfcnfg_release_adap_layer);
 251
 252 static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id)
 253 {
 254 }
 255
 256 int protohead[CFCTRL_SRV_MASK] = {
 257         [CFCTRL_SRV_VEI] = 4,
 258         [CFCTRL_SRV_DATAGRAM] = 7,
 259         [CFCTRL_SRV_UTIL] = 4,
 260         [CFCTRL_SRV_RFM] = 3,
 261         [CFCTRL_SRV_DBG] = 3,
 262 };
 263
 264 int cfcnfg_add_adaptation_layer(struct cfcnfg *cnfg,
 265                                 struct cfctrl_link_param *param,
 266                                 struct cflayer *adap_layer,
 267                                 int *ifindex,
 268                                 int *proto_head,
 269                                 int *proto_tail)
 270 {
 271         struct cflayer *frml;
 272         if (adap_layer == NULL) {
 273                 pr_err("adap_layer is zero\n");
 274                 return -EINVAL;
 275         }
 276         if (adap_layer->receive == NULL) {
 277                 pr_err("adap_layer->receive is NULL\n");
 278                 return -EINVAL;
 279         }
 280         if (adap_layer->ctrlcmd == NULL) {
 281                 pr_err("adap_layer->ctrlcmd == NULL\n");
 282                 return -EINVAL;
 283         }
 284         frml = cnfg->phy_layers[param->phyid].frm_layer;
 285         if (frml == NULL) {
 286                 pr_err("Specified PHY type does not exist!\n");
 287                 return -ENODEV;
 288         }
 289         caif_assert(param->phyid == cnfg->phy_layers[param->phyid].id);
 290         caif_assert(cnfg->phy_layers[param->phyid].frm_layer->id ==
 291                      param->phyid);
 292         caif_assert(cnfg->phy_layers[param->phyid].phy_layer->id ==
 293                      param->phyid);
 294
 295         *ifindex = cnfg->phy_layers[param->phyid].ifindex;
 296         *proto_head =
 297                 protohead[param->linktype]+
 298                 (cnfg->phy_layers[param->phyid].use_stx ? 1 : 0);
 299
 300         *proto_tail = 2;
 301
 302         /* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */
 303         cfctrl_enum_req(cnfg->ctrl, param->phyid);
 304         return cfctrl_linkup_request(cnfg->ctrl, param, adap_layer);
 305 }
 306 EXPORT_SYMBOL(cfcnfg_add_adaptation_layer);
 307
 308 static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
 309                              struct cflayer *adapt_layer)
 310 {
 311         if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL)
 312                 adapt_layer->ctrlcmd(adapt_layer,
 313                                      CAIF_CTRLCMD_INIT_FAIL_RSP, 0);
 314 }
 315
 316 static void
 317 cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv,
 318                  u8 phyid, struct cflayer *adapt_layer)
 319 {
 320         struct cfcnfg *cnfg = container_obj(layer);
 321         struct cflayer *servicel = NULL;
 322         struct cfcnfg_phyinfo *phyinfo;
 323         struct net_device *netdev;
 324
 325         if (adapt_layer == NULL) {
 326                 pr_debug("link setup response but no client exist, send linkdown back\n");
 327                 cfctrl_linkdown_req(cnfg->ctrl, channel_id, NULL);
 328                 return;
 329         }
 330
 331         caif_assert(cnfg != NULL);
 332         caif_assert(phyid != 0);
 333         phyinfo = &cnfg->phy_layers[phyid];
 334         caif_assert(phyinfo->id == phyid);
 335         caif_assert(phyinfo->phy_layer != NULL);
 336         caif_assert(phyinfo->phy_layer->id == phyid);
 337
 338         phyinfo->phy_ref_count++;
 339         if (phyinfo->phy_ref_count == 1 &&
 340             phyinfo->phy_layer->modemcmd != NULL) {
 341                 phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
 342                                              _CAIF_MODEMCMD_PHYIF_USEFULL);
 343         }
 344         adapt_layer->id = channel_id;
 345
 346         switch (serv) {
 347         case CFCTRL_SRV_VEI:
 348                 servicel = cfvei_create(channel_id, &phyinfo->dev_info);
 349                 break;
 350         case CFCTRL_SRV_DATAGRAM:
 351                 servicel = cfdgml_create(channel_id, &phyinfo->dev_info);
 352                 break;
 353         case CFCTRL_SRV_RFM:
 354                 netdev = phyinfo->dev_info.dev;
 355                 servicel = cfrfml_create(channel_id, &phyinfo->dev_info,
 356                                                 netdev->mtu);
 357                 break;
 358         case CFCTRL_SRV_UTIL:
 359                 servicel = cfutill_create(channel_id, &phyinfo->dev_info);
 360                 break;
 361         case CFCTRL_SRV_VIDEO:
 362                 servicel = cfvidl_create(channel_id, &phyinfo->dev_info);
 363                 break;
 364         case CFCTRL_SRV_DBG:
 365                 servicel = cfdbgl_create(channel_id, &phyinfo->dev_info);
 366                 break;
 367         default:
 368                 pr_err("Protocol error. Link setup response - unknown channel type\n");
 369                 return;
 370         }
 371         if (!servicel) {
 372                 pr_warn("Out of memory\n");
 373                 return;
 374         }
 375         layer_set_dn(servicel, cnfg->mux);
 376         cfmuxl_set_uplayer(cnfg->mux, servicel, channel_id);
 377         layer_set_up(servicel, adapt_layer);
 378         layer_set_dn(adapt_layer, servicel);
 379         cfsrvl_get(servicel);
 380         servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0);
 381 }
 382
 383 void
 384 cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type,
 385                      struct net_device *dev, struct cflayer *phy_layer,
 386                      u16 *phyid, enum cfcnfg_phy_preference pref,
 387                      bool fcs, bool stx)
 388 {
 389         struct cflayer *frml;
 390         struct cflayer *phy_driver = NULL;
 391         int i;
 392
 393
 394         if (cnfg->phy_layers[cnfg->last_phyid].frm_layer == NULL) {
 395                 *phyid = cnfg->last_phyid;
 396
 397                 /* range: * 1..(MAX_PHY_LAYERS-1) */
 398                 cnfg->last_phyid =
 399                     (cnfg->last_phyid % (MAX_PHY_LAYERS - 1)) + 1;
 400         } else {
 401                 *phyid = 0;
 402                 for (i = 1; i < MAX_PHY_LAYERS; i++) {
 403                         if (cnfg->phy_layers[i].frm_layer == NULL) {
 404                                 *phyid = i;
 405                                 break;
 406                         }
 407                 }
 408         }
 409         if (*phyid == 0) {
 410                 pr_err("No Available PHY ID\n");
 411                 return;
 412         }
 413
 414         switch (phy_type) {
 415         case CFPHYTYPE_FRAG:
 416                 phy_driver =
 417                     cfserl_create(CFPHYTYPE_FRAG, *phyid, stx);
 418                 if (!phy_driver) {
 419                         pr_warn("Out of memory\n");
 420                         return;
 421                 }
 422
 423                 break;
 424         case CFPHYTYPE_CAIF:
 425                 phy_driver = NULL;
 426                 break;
 427         default:
 428                 pr_err("%d\n", phy_type);
 429                 return;
 430                 break;
 431         }
 432
 433         phy_layer->id = *phyid;
 434         cnfg->phy_layers[*phyid].pref = pref;
 435         cnfg->phy_layers[*phyid].id = *phyid;
 436         cnfg->phy_layers[*phyid].dev_info.id = *phyid;
 437         cnfg->phy_layers[*phyid].dev_info.dev = dev;
 438         cnfg->phy_layers[*phyid].phy_layer = phy_layer;
 439         cnfg->phy_layers[*phyid].phy_ref_count = 0;
 440         cnfg->phy_layers[*phyid].ifindex = dev->ifindex;
 441         cnfg->phy_layers[*phyid].use_stx = stx;
 442         cnfg->phy_layers[*phyid].use_fcs = fcs;
 443
 444         phy_layer->type = phy_type;
 445         frml = cffrml_create(*phyid, fcs);
 446         if (!frml) {
 447                 pr_warn("Out of memory\n");
 448                 return;
 449         }
 450         cnfg->phy_layers[*phyid].frm_layer = frml;
 451         cfmuxl_set_dnlayer(cnfg->mux, frml, *phyid);
 452         layer_set_up(frml, cnfg->mux);
 453
 454         if (phy_driver != NULL) {
 455                 phy_driver->id = *phyid;
 456                 layer_set_dn(frml, phy_driver);
 457                 layer_set_up(phy_driver, frml);
 458                 layer_set_dn(phy_driver, phy_layer);
 459                 layer_set_up(phy_layer, phy_driver);
 460         } else {
 461                 layer_set_dn(frml, phy_layer);
 462                 layer_set_up(phy_layer, frml);
 463         }
 464 }
 465 EXPORT_SYMBOL(cfcnfg_add_phy_layer);
 466
 467 int cfcnfg_del_phy_layer(struct cfcnfg *cnfg, struct cflayer *phy_layer)
 468 {
 469         struct cflayer *frml, *frml_dn;
 470         u16 phyid;
 471         phyid = phy_layer->id;
 472         caif_assert(phyid == cnfg->phy_layers[phyid].id);
 473         caif_assert(phy_layer == cnfg->phy_layers[phyid].phy_layer);
 474         caif_assert(phy_layer->id == phyid);
 475         caif_assert(cnfg->phy_layers[phyid].frm_layer->id == phyid);
 476
 477         memset(&cnfg->phy_layers[phy_layer->id], 0,
 478                sizeof(struct cfcnfg_phyinfo));
 479         frml = cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id);
 480         frml_dn = frml->dn;
 481         cffrml_set_uplayer(frml, NULL);
 482         cffrml_set_dnlayer(frml, NULL);
 483         kfree(frml);
 484
 485         if (phy_layer != frml_dn) {
 486                 layer_set_up(frml_dn, NULL);
 487                 layer_set_dn(frml_dn, NULL);
 488                 kfree(frml_dn);
 489         }
 490         layer_set_up(phy_layer, NULL);
 491         return 0;
 492 }
 493 EXPORT_SYMBOL(cfcnfg_del_phy_layer);