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 #define PHY_NAME_LEN 20
  27
  28 #define container_obj(layr) container_of(layr, struct cfcnfg, layer)
  29 #define RFM_FRAGMENT_SIZE 4030
  30
  31 /* Information about CAIF physical interfaces held by Config Module in order
  32  * to manage physical interfaces
  33  */
  34 struct cfcnfg_phyinfo {
  35         /* Pointer to the layer below the MUX (framing layer) */
  36         struct cflayer *frm_layer;
  37         /* Pointer to the lowest actual physical layer */
  38         struct cflayer *phy_layer;
  39         /* Unique identifier of the physical interface */
  40         unsigned int id;
  41         /* Preference of the physical in interface */
  42         enum cfcnfg_phy_preference pref;
  43
  44         /* Reference count, number of channels using the device */
  45         int phy_ref_count;
  46
  47         /* Information about the physical device */
  48         struct dev_info dev_info;
  49
  50         /* Interface index */
  51         int ifindex;
  52
  53         /* Use Start of frame extension */
  54         bool use_stx;
  55
  56         /* Use Start of frame checksum */
  57         bool use_fcs;
  58 };
  59
  60 struct cfcnfg {
  61         struct cflayer layer;
  62         struct cflayer *ctrl;
  63         struct cflayer *mux;
  64         u8 last_phyid;
  65         struct cfcnfg_phyinfo phy_layers[MAX_PHY_LAYERS];
  66 };
  67
  68 static void cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id,
  69                              enum cfctrl_srv serv, u8 phyid,
  70                              struct cflayer *adapt_layer);
  71 static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id);
  72 static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
  73                              struct cflayer *adapt_layer);
  74 static void cfctrl_resp_func(void);
  75 static void cfctrl_enum_resp(void);
  76
  77 struct cfcnfg *cfcnfg_create(void)
  78 {
  79         struct cfcnfg *this;
  80         struct cfctrl_rsp *resp;
  81         /* Initiate this layer */
  82         this = kzalloc(sizeof(struct cfcnfg), GFP_ATOMIC);
  83         if (!this) {
  84                 pr_warn("Out of memory\n");
  85                 return NULL;
  86         }
  87         this->mux = cfmuxl_create();
  88         if (!this->mux)
  89                 goto out_of_mem;
  90         this->ctrl = cfctrl_create();
  91         if (!this->ctrl)
  92                 goto out_of_mem;
  93         /* Initiate response functions */
  94         resp = cfctrl_get_respfuncs(this->ctrl);
  95         resp->enum_rsp = cfctrl_enum_resp;
  96         resp->linkerror_ind = cfctrl_resp_func;
  97         resp->linkdestroy_rsp = cfcnfg_linkdestroy_rsp;
  98         resp->sleep_rsp = cfctrl_resp_func;
  99         resp->wake_rsp = cfctrl_resp_func;
 100         resp->restart_rsp = cfctrl_resp_func;
 101         resp->radioset_rsp = cfctrl_resp_func;
 102         resp->linksetup_rsp = cfcnfg_linkup_rsp;
 103         resp->reject_rsp = cfcnfg_reject_rsp;
 104
 105         this->last_phyid = 1;
 106
 107         cfmuxl_set_uplayer(this->mux, this->ctrl, 0);
 108         layer_set_dn(this->ctrl, this->mux);
 109         layer_set_up(this->ctrl, this);
 110         return this;
 111 out_of_mem:
 112         pr_warn("Out of memory\n");
 113         kfree(this->mux);
 114         kfree(this->ctrl);
 115         kfree(this);
 116         return NULL;
 117 }
 118 EXPORT_SYMBOL(cfcnfg_create);
 119
 120 void cfcnfg_remove(struct cfcnfg *cfg)
 121 {
 122         if (cfg) {
 123                 kfree(cfg->mux);
 124                 kfree(cfg->ctrl);
 125                 kfree(cfg);
 126         }
 127 }
 128
 129 static void cfctrl_resp_func(void)
 130 {
 131 }
 132
 133 static void cfctrl_enum_resp(void)
 134 {
 135 }
 136
 137 struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg,
 138                                   enum cfcnfg_phy_preference phy_pref)
 139 {
 140         u16 i;
 141
 142         /* Try to match with specified preference */
 143         for (i = 1; i < MAX_PHY_LAYERS; i++) {
 144                 if (cnfg->phy_layers[i].id == i &&
 145                      cnfg->phy_layers[i].pref == phy_pref &&
 146                      cnfg->phy_layers[i].frm_layer != NULL) {
 147                         caif_assert(cnfg->phy_layers != NULL);
 148                         caif_assert(cnfg->phy_layers[i].id == i);
 149                         return &cnfg->phy_layers[i].dev_info;
 150                 }
 151         }
 152         /* Otherwise just return something */
 153         for (i = 1; i < MAX_PHY_LAYERS; i++) {
 154                 if (cnfg->phy_layers[i].id == i) {
 155                         caif_assert(cnfg->phy_layers != NULL);
 156                         caif_assert(cnfg->phy_layers[i].id == i);
 157                         return &cnfg->phy_layers[i].dev_info;
 158                 }
 159         }
 160
 161         return NULL;
 162 }
 163
 164 static struct cfcnfg_phyinfo *cfcnfg_get_phyinfo(struct cfcnfg *cnfg,
 165                                                         u8 phyid)
 166 {
 167         int i;
 168         /* Try to match with specified preference */
 169         for (i = 0; i < MAX_PHY_LAYERS; i++)
 170                 if (cnfg->phy_layers[i].frm_layer != NULL &&
 171                     cnfg->phy_layers[i].id == phyid)
 172                         return &cnfg->phy_layers[i];
 173         return NULL;
 174 }
 175
 176
 177 int cfcnfg_get_id_from_ifi(struct cfcnfg *cnfg, int ifi)
 178 {
 179         int i;
 180         for (i = 0; i < MAX_PHY_LAYERS; i++)
 181                 if (cnfg->phy_layers[i].frm_layer != NULL &&
 182                                 cnfg->phy_layers[i].ifindex == ifi)
 183                         return i;
 184         return -ENODEV;
 185 }
 186
 187 int cfcnfg_disconn_adapt_layer(struct cfcnfg *cnfg, struct cflayer *adap_layer)
 188 {
 189         u8 channel_id = 0;
 190         int ret = 0;
 191         struct cflayer *servl = NULL;
 192         struct cfcnfg_phyinfo *phyinfo = NULL;
 193         u8 phyid = 0;
 194         caif_assert(adap_layer != NULL);
 195         channel_id = adap_layer->id;
 196         if (adap_layer->dn == NULL || channel_id == 0) {
 197                 pr_err("adap_layer->dn == NULL or adap_layer->id is 0\n");
 198                 ret = -ENOTCONN;
 199                 goto end;
 200         }
 201         servl = cfmuxl_remove_uplayer(cnfg->mux, channel_id);
 202         if (servl == NULL)
 203                 goto end;
 204         layer_set_up(servl, NULL);
 205         ret = cfctrl_linkdown_req(cnfg->ctrl, channel_id, adap_layer);
 206         if (servl == NULL) {
 207                 pr_err("PROTOCOL ERROR - Error removing service_layer Channel_Id(%d)",
 208                        channel_id);
 209                 ret = -EINVAL;
 210                 goto end;
 211         }
 212         caif_assert(channel_id == servl->id);
 213         if (adap_layer->dn != NULL) {
 214                 phyid = cfsrvl_getphyid(adap_layer->dn);
 215
 216                 phyinfo = cfcnfg_get_phyinfo(cnfg, phyid);
 217                 if (phyinfo == NULL) {
 218                         pr_warn("No interface to send disconnect to\n");
 219                         ret = -ENODEV;
 220                         goto end;
 221                 }
 222                 if (phyinfo->id != phyid ||
 223                         phyinfo->phy_layer->id != phyid ||
 224                         phyinfo->frm_layer->id != phyid) {
 225                         pr_err("Inconsistency in phy registration\n");
 226                         ret = -EINVAL;
 227                         goto end;
 228                 }
 229         }
 230         if (phyinfo != NULL && --phyinfo->phy_ref_count == 0 &&
 231                 phyinfo->phy_layer != NULL &&
 232                 phyinfo->phy_layer->modemcmd != NULL) {
 233                 phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
 234                                              _CAIF_MODEMCMD_PHYIF_USELESS);
 235         }
 236 end:
 237         cfsrvl_put(servl);
 238         cfctrl_cancel_req(cnfg->ctrl, adap_layer);
 239         if (adap_layer->ctrlcmd != NULL)
 240                 adap_layer->ctrlcmd(adap_layer, CAIF_CTRLCMD_DEINIT_RSP, 0);
 241         return ret;
 242
 243 }
 244 EXPORT_SYMBOL(cfcnfg_disconn_adapt_layer);
 245
 246 void cfcnfg_release_adap_layer(struct cflayer *adap_layer)
 247 {
 248         if (adap_layer->dn)
 249                 cfsrvl_put(adap_layer->dn);
 250 }
 251 EXPORT_SYMBOL(cfcnfg_release_adap_layer);
 252
 253 static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id)
 254 {
 255 }
 256
 257 int protohead[CFCTRL_SRV_MASK] = {
 258         [CFCTRL_SRV_VEI] = 4,
 259         [CFCTRL_SRV_DATAGRAM] = 7,
 260         [CFCTRL_SRV_UTIL] = 4,
 261         [CFCTRL_SRV_RFM] = 3,
 262         [CFCTRL_SRV_DBG] = 3,
 263 };
 264
 265 int cfcnfg_add_adaptation_layer(struct cfcnfg *cnfg,
 266                                 struct cfctrl_link_param *param,
 267                                 struct cflayer *adap_layer,
 268                                 int *ifindex,
 269                                 int *proto_head,
 270                                 int *proto_tail)
 271 {
 272         struct cflayer *frml;
 273         if (adap_layer == NULL) {
 274                 pr_err("adap_layer is zero\n");
 275                 return -EINVAL;
 276         }
 277         if (adap_layer->receive == NULL) {
 278                 pr_err("adap_layer->receive is NULL\n");
 279                 return -EINVAL;
 280         }
 281         if (adap_layer->ctrlcmd == NULL) {
 282                 pr_err("adap_layer->ctrlcmd == NULL\n");
 283                 return -EINVAL;
 284         }
 285         frml = cnfg->phy_layers[param->phyid].frm_layer;
 286         if (frml == NULL) {
 287                 pr_err("Specified PHY type does not exist!\n");
 288                 return -ENODEV;
 289         }
 290         caif_assert(param->phyid == cnfg->phy_layers[param->phyid].id);
 291         caif_assert(cnfg->phy_layers[param->phyid].frm_layer->id ==
 292                      param->phyid);
 293         caif_assert(cnfg->phy_layers[param->phyid].phy_layer->id ==
 294                      param->phyid);
 295
 296         *ifindex = cnfg->phy_layers[param->phyid].ifindex;
 297         *proto_head =
 298                 protohead[param->linktype]+
 299                 (cnfg->phy_layers[param->phyid].use_stx ? 1 : 0);
 300
 301         *proto_tail = 2;
 302
 303         /* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */
 304         cfctrl_enum_req(cnfg->ctrl, param->phyid);
 305         return cfctrl_linkup_request(cnfg->ctrl, param, adap_layer);
 306 }
 307 EXPORT_SYMBOL(cfcnfg_add_adaptation_layer);
 308
 309 static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
 310                              struct cflayer *adapt_layer)
 311 {
 312         if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL)
 313                 adapt_layer->ctrlcmd(adapt_layer,
 314                                      CAIF_CTRLCMD_INIT_FAIL_RSP, 0);
 315 }
 316
 317 static void
 318 cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv,
 319                  u8 phyid, struct cflayer *adapt_layer)
 320 {
 321         struct cfcnfg *cnfg = container_obj(layer);
 322         struct cflayer *servicel = NULL;
 323         struct cfcnfg_phyinfo *phyinfo;
 324         struct net_device *netdev;
 325
 326         if (adapt_layer == NULL) {
 327                 pr_debug("link setup response but no client exist, send linkdown back\n");
 328                 cfctrl_linkdown_req(cnfg->ctrl, channel_id, NULL);
 329                 return;
 330         }
 331
 332         caif_assert(cnfg != NULL);
 333         caif_assert(phyid != 0);
 334         phyinfo = &cnfg->phy_layers[phyid];
 335         caif_assert(phyinfo->id == phyid);
 336         caif_assert(phyinfo->phy_layer != NULL);
 337         caif_assert(phyinfo->phy_layer->id == phyid);
 338
 339         phyinfo->phy_ref_count++;
 340         if (phyinfo->phy_ref_count == 1 &&
 341             phyinfo->phy_layer->modemcmd != NULL) {
 342                 phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
 343                                              _CAIF_MODEMCMD_PHYIF_USEFULL);
 344         }
 345         adapt_layer->id = channel_id;
 346
 347         switch (serv) {
 348         case CFCTRL_SRV_VEI:
 349                 servicel = cfvei_create(channel_id, &phyinfo->dev_info);
 350                 break;
 351         case CFCTRL_SRV_DATAGRAM:
 352                 servicel = cfdgml_create(channel_id, &phyinfo->dev_info);
 353                 break;
 354         case CFCTRL_SRV_RFM:
 355                 netdev = phyinfo->dev_info.dev;
 356                 servicel = cfrfml_create(channel_id, &phyinfo->dev_info,
 357                                                 netdev->mtu);
 358                 break;
 359         case CFCTRL_SRV_UTIL:
 360                 servicel = cfutill_create(channel_id, &phyinfo->dev_info);
 361                 break;
 362         case CFCTRL_SRV_VIDEO:
 363                 servicel = cfvidl_create(channel_id, &phyinfo->dev_info);
 364                 break;
 365         case CFCTRL_SRV_DBG:
 366                 servicel = cfdbgl_create(channel_id, &phyinfo->dev_info);
 367                 break;
 368         default:
 369                 pr_err("Protocol error. Link setup response - unknown channel type\n");
 370                 return;
 371         }
 372         if (!servicel) {
 373                 pr_warn("Out of memory\n");
 374                 return;
 375         }
 376         layer_set_dn(servicel, cnfg->mux);
 377         cfmuxl_set_uplayer(cnfg->mux, servicel, channel_id);
 378         layer_set_up(servicel, adapt_layer);
 379         layer_set_dn(adapt_layer, servicel);
 380         cfsrvl_get(servicel);
 381         servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0);
 382 }
 383
 384 void
 385 cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type,
 386                      struct net_device *dev, struct cflayer *phy_layer,
 387                      u16 *phyid, enum cfcnfg_phy_preference pref,
 388                      bool fcs, bool stx)
 389 {
 390         struct cflayer *frml;
 391         struct cflayer *phy_driver = NULL;
 392         int i;
 393
 394
 395         if (cnfg->phy_layers[cnfg->last_phyid].frm_layer == NULL) {
 396                 *phyid = cnfg->last_phyid;
 397
 398                 /* range: * 1..(MAX_PHY_LAYERS-1) */
 399                 cnfg->last_phyid =
 400                     (cnfg->last_phyid % (MAX_PHY_LAYERS - 1)) + 1;
 401         } else {
 402                 *phyid = 0;
 403                 for (i = 1; i < MAX_PHY_LAYERS; i++) {
 404                         if (cnfg->phy_layers[i].frm_layer == NULL) {
 405                                 *phyid = i;
 406                                 break;
 407                         }
 408                 }
 409         }
 410         if (*phyid == 0) {
 411                 pr_err("No Available PHY ID\n");
 412                 return;
 413         }
 414
 415         switch (phy_type) {
 416         case CFPHYTYPE_FRAG:
 417                 phy_driver =
 418                     cfserl_create(CFPHYTYPE_FRAG, *phyid, stx);
 419                 if (!phy_driver) {
 420                         pr_warn("Out of memory\n");
 421                         return;
 422                 }
 423
 424                 break;
 425         case CFPHYTYPE_CAIF:
 426                 phy_driver = NULL;
 427                 break;
 428         default:
 429                 pr_err("%d\n", phy_type);
 430                 return;
 431                 break;
 432         }
 433
 434         phy_layer->id = *phyid;
 435         cnfg->phy_layers[*phyid].pref = pref;
 436         cnfg->phy_layers[*phyid].id = *phyid;
 437         cnfg->phy_layers[*phyid].dev_info.id = *phyid;
 438         cnfg->phy_layers[*phyid].dev_info.dev = dev;
 439         cnfg->phy_layers[*phyid].phy_layer = phy_layer;
 440         cnfg->phy_layers[*phyid].phy_ref_count = 0;
 441         cnfg->phy_layers[*phyid].ifindex = dev->ifindex;
 442         cnfg->phy_layers[*phyid].use_stx = stx;
 443         cnfg->phy_layers[*phyid].use_fcs = fcs;
 444
 445         phy_layer->type = phy_type;
 446         frml = cffrml_create(*phyid, fcs);
 447         if (!frml) {
 448                 pr_warn("Out of memory\n");
 449                 return;
 450         }
 451         cnfg->phy_layers[*phyid].frm_layer = frml;
 452         cfmuxl_set_dnlayer(cnfg->mux, frml, *phyid);
 453         layer_set_up(frml, cnfg->mux);
 454
 455         if (phy_driver != NULL) {
 456                 phy_driver->id = *phyid;
 457                 layer_set_dn(frml, phy_driver);
 458                 layer_set_up(phy_driver, frml);
 459                 layer_set_dn(phy_driver, phy_layer);
 460                 layer_set_up(phy_layer, phy_driver);
 461         } else {
 462                 layer_set_dn(frml, phy_layer);
 463                 layer_set_up(phy_layer, frml);
 464         }
 465 }
 466 EXPORT_SYMBOL(cfcnfg_add_phy_layer);
 467
 468 int cfcnfg_del_phy_layer(struct cfcnfg *cnfg, struct cflayer *phy_layer)
 469 {
 470         struct cflayer *frml, *frml_dn;
 471         u16 phyid;
 472         phyid = phy_layer->id;
 473         caif_assert(phyid == cnfg->phy_layers[phyid].id);
 474         caif_assert(phy_layer == cnfg->phy_layers[phyid].phy_layer);
 475         caif_assert(phy_layer->id == phyid);
 476         caif_assert(cnfg->phy_layers[phyid].frm_layer->id == phyid);
 477
 478         memset(&cnfg->phy_layers[phy_layer->id], 0,
 479                sizeof(struct cfcnfg_phyinfo));
 480         frml = cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id);
 481         frml_dn = frml->dn;
 482         cffrml_set_uplayer(frml, NULL);
 483         cffrml_set_dnlayer(frml, NULL);
 484         kfree(frml);
 485
 486         if (phy_layer != frml_dn) {
 487                 layer_set_up(frml_dn, NULL);
 488                 layer_set_dn(frml_dn, NULL);
 489                 kfree(frml_dn);
 490         }
 491         layer_set_up(phy_layer, NULL);
 492         return 0;
 493 }
 494 EXPORT_SYMBOL(cfcnfg_del_phy_layer);