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 #include <linux/kernel.h>
   7 #include <linux/stddef.h>
   8 #include <linux/slab.h>
   9 #include <linux/netdevice.h>
  10 #include <net/caif/caif_layer.h>
  11 #include <net/caif/cfpkt.h>
  12 #include <net/caif/cfcnfg.h>
  13 #include <net/caif/cfctrl.h>
  14 #include <net/caif/cfmuxl.h>
  15 #include <net/caif/cffrml.h>
  16 #include <net/caif/cfserl.h>
  17 #include <net/caif/cfsrvl.h>
  18
  19 #include <linux/module.h>
  20 #include <asm/atomic.h>
  21
  22 #define MAX_PHY_LAYERS 7
  23 #define PHY_NAME_LEN 20
  24
  25 #define container_obj(layr) container_of(layr, struct cfcnfg, layer)
  26 #define RFM_FRAGMENT_SIZE 4030
  27
  28 /* Information about CAIF physical interfaces held by Config Module in order
  29  * to manage physical interfaces
  30  */
  31 struct cfcnfg_phyinfo {
  32         /* Pointer to the layer below the MUX (framing layer) */
  33         struct cflayer *frm_layer;
  34         /* Pointer to the lowest actual physical layer */
  35         struct cflayer *phy_layer;
  36         /* Unique identifier of the physical interface */
  37         unsigned int id;
  38         /* Preference of the physical in interface */
  39         enum cfcnfg_phy_preference pref;
  40
  41         /* Reference count, number of channels using the device */
  42         int phy_ref_count;
  43
  44         /* Information about the physical device */
  45         struct dev_info dev_info;
  46
  47         /* Interface index */
  48         int ifindex;
  49
  50         /* Use Start of frame extension */
  51         bool use_stx;
  52
  53         /* Use Start of frame checksum */
  54         bool use_fcs;
  55 };
  56
  57 struct cfcnfg {
  58         struct cflayer layer;
  59         struct cflayer *ctrl;
  60         struct cflayer *mux;
  61         u8 last_phyid;
  62         struct cfcnfg_phyinfo phy_layers[MAX_PHY_LAYERS];
  63 };
  64
  65 static void cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id,
  66                              enum cfctrl_srv serv, u8 phyid,
  67                              struct cflayer *adapt_layer);
  68 static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id);
  69 static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
  70                              struct cflayer *adapt_layer);
  71 static void cfctrl_resp_func(void);
  72 static void cfctrl_enum_resp(void);
  73
  74 struct cfcnfg *cfcnfg_create(void)
  75 {
  76         struct cfcnfg *this;
  77         struct cfctrl_rsp *resp;
  78         /* Initiate this layer */
  79         this = kzalloc(sizeof(struct cfcnfg), GFP_ATOMIC);
  80         if (!this) {
  81                 pr_warning("CAIF: %s(): Out of memory\n", __func__);
  82                 return NULL;
  83         }
  84         this->mux = cfmuxl_create();
  85         if (!this->mux)
  86                 goto out_of_mem;
  87         this->ctrl = cfctrl_create();
  88         if (!this->ctrl)
  89                 goto out_of_mem;
  90         /* Initiate response functions */
  91         resp = cfctrl_get_respfuncs(this->ctrl);
  92         resp->enum_rsp = cfctrl_enum_resp;
  93         resp->linkerror_ind = cfctrl_resp_func;
  94         resp->linkdestroy_rsp = cfcnfg_linkdestroy_rsp;
  95         resp->sleep_rsp = cfctrl_resp_func;
  96         resp->wake_rsp = cfctrl_resp_func;
  97         resp->restart_rsp = cfctrl_resp_func;
  98         resp->radioset_rsp = cfctrl_resp_func;
  99         resp->linksetup_rsp = cfcnfg_linkup_rsp;
 100         resp->reject_rsp = cfcnfg_reject_rsp;
 101
 102         this->last_phyid = 1;
 103
 104         cfmuxl_set_uplayer(this->mux, this->ctrl, 0);
 105         layer_set_dn(this->ctrl, this->mux);
 106         layer_set_up(this->ctrl, this);
 107         return this;
 108 out_of_mem:
 109         pr_warning("CAIF: %s(): Out of memory\n", __func__);
 110         kfree(this->mux);
 111         kfree(this->ctrl);
 112         kfree(this);
 113         return NULL;
 114 }
 115 EXPORT_SYMBOL(cfcnfg_create);
 116
 117 void cfcnfg_remove(struct cfcnfg *cfg)
 118 {
 119         if (cfg) {
 120                 kfree(cfg->mux);
 121                 kfree(cfg->ctrl);
 122                 kfree(cfg);
 123         }
 124 }
 125
 126 static void cfctrl_resp_func(void)
 127 {
 128 }
 129
 130 static void cfctrl_enum_resp(void)
 131 {
 132 }
 133
 134 struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg,
 135                                   enum cfcnfg_phy_preference phy_pref)
 136 {
 137         u16 i;
 138
 139         /* Try to match with specified preference */
 140         for (i = 1; i < MAX_PHY_LAYERS; i++) {
 141                 if (cnfg->phy_layers[i].id == i &&
 142                      cnfg->phy_layers[i].pref == phy_pref &&
 143                      cnfg->phy_layers[i].frm_layer != NULL) {
 144                         caif_assert(cnfg->phy_layers != NULL);
 145                         caif_assert(cnfg->phy_layers[i].id == i);
 146                         return &cnfg->phy_layers[i].dev_info;
 147                 }
 148         }
 149         /* Otherwise just return something */
 150         for (i = 1; i < MAX_PHY_LAYERS; i++) {
 151                 if (cnfg->phy_layers[i].id == i) {
 152                         caif_assert(cnfg->phy_layers != NULL);
 153                         caif_assert(cnfg->phy_layers[i].id == i);
 154                         return &cnfg->phy_layers[i].dev_info;
 155                 }
 156         }
 157
 158         return NULL;
 159 }
 160
 161 static struct cfcnfg_phyinfo *cfcnfg_get_phyinfo(struct cfcnfg *cnfg,
 162                                                         u8 phyid)
 163 {
 164         int i;
 165         /* Try to match with specified preference */
 166         for (i = 0; i < MAX_PHY_LAYERS; i++)
 167                 if (cnfg->phy_layers[i].frm_layer != NULL &&
 168                     cnfg->phy_layers[i].id == phyid)
 169                         return &cnfg->phy_layers[i];
 170         return NULL;
 171 }
 172
 173 int cfcnfg_get_named(struct cfcnfg *cnfg, char *name)
 174 {
 175         int i;
 176
 177         /* Try to match with specified name */
 178         for (i = 0; i < MAX_PHY_LAYERS; i++) {
 179                 if (cnfg->phy_layers[i].frm_layer != NULL
 180                     && strcmp(cnfg->phy_layers[i].phy_layer->name,
 181                               name) == 0)
 182                         return cnfg->phy_layers[i].frm_layer->id;
 183         }
 184         return 0;
 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("CAIF: %s():adap_layer->id is 0\n", __func__);
 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("CAIF: %s(): PROTOCOL ERROR "
 208                        "- Error removing service_layer Channel_Id(%d)",
 209                         __func__, channel_id);
 210                 ret = -EINVAL;
 211                 goto end;
 212         }
 213         caif_assert(channel_id == servl->id);
 214         if (adap_layer->dn != NULL) {
 215                 phyid = cfsrvl_getphyid(adap_layer->dn);
 216
 217                 phyinfo = cfcnfg_get_phyinfo(cnfg, phyid);
 218                 if (phyinfo == NULL) {
 219                         pr_warning("CAIF: %s(): "
 220                                 "No interface to send disconnect to\n",
 221                                 __func__);
 222                         ret = -ENODEV;
 223                         goto end;
 224                 }
 225                 if (phyinfo->id != phyid ||
 226                         phyinfo->phy_layer->id != phyid ||
 227                         phyinfo->frm_layer->id != phyid) {
 228                         pr_err("CAIF: %s(): "
 229                                 "Inconsistency in phy registration\n",
 230                                 __func__);
 231                         ret = -EINVAL;
 232                         goto end;
 233                 }
 234         }
 235         if (phyinfo != NULL && --phyinfo->phy_ref_count == 0 &&
 236                 phyinfo->phy_layer != NULL &&
 237                 phyinfo->phy_layer->modemcmd != NULL) {
 238                 phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
 239                                              _CAIF_MODEMCMD_PHYIF_USELESS);
 240         }
 241 end:
 242         cfsrvl_put(servl);
 243         cfctrl_cancel_req(cnfg->ctrl, adap_layer);
 244         if (adap_layer->ctrlcmd != NULL)
 245                 adap_layer->ctrlcmd(adap_layer, CAIF_CTRLCMD_DEINIT_RSP, 0);
 246         return ret;
 247
 248 }
 249 EXPORT_SYMBOL(cfcnfg_disconn_adapt_layer);
 250
 251 void cfcnfg_release_adap_layer(struct cflayer *adap_layer)
 252 {
 253         if (adap_layer->dn)
 254                 cfsrvl_put(adap_layer->dn);
 255 }
 256 EXPORT_SYMBOL(cfcnfg_release_adap_layer);
 257
 258 static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id)
 259 {
 260 }
 261
 262 int protohead[CFCTRL_SRV_MASK] = {
 263         [CFCTRL_SRV_VEI] = 4,
 264         [CFCTRL_SRV_DATAGRAM] = 7,
 265         [CFCTRL_SRV_UTIL] = 4,
 266         [CFCTRL_SRV_RFM] = 3,
 267         [CFCTRL_SRV_DBG] = 3,
 268 };
 269
 270 int cfcnfg_add_adaptation_layer(struct cfcnfg *cnfg,
 271                                 struct cfctrl_link_param *param,
 272                                 struct cflayer *adap_layer,
 273                                 int *ifindex,
 274                                 int *proto_head,
 275                                 int *proto_tail)
 276 {
 277         struct cflayer *frml;
 278         if (adap_layer == NULL) {
 279                 pr_err("CAIF: %s(): adap_layer is zero", __func__);
 280                 return -EINVAL;
 281         }
 282         if (adap_layer->receive == NULL) {
 283                 pr_err("CAIF: %s(): adap_layer->receive is NULL", __func__);
 284                 return -EINVAL;
 285         }
 286         if (adap_layer->ctrlcmd == NULL) {
 287                 pr_err("CAIF: %s(): adap_layer->ctrlcmd == NULL", __func__);
 288                 return -EINVAL;
 289         }
 290         frml = cnfg->phy_layers[param->phyid].frm_layer;
 291         if (frml == NULL) {
 292                 pr_err("CAIF: %s(): Specified PHY type does not exist!",
 293                         __func__);
 294                 return -ENODEV;
 295         }
 296         caif_assert(param->phyid == cnfg->phy_layers[param->phyid].id);
 297         caif_assert(cnfg->phy_layers[param->phyid].frm_layer->id ==
 298                      param->phyid);
 299         caif_assert(cnfg->phy_layers[param->phyid].phy_layer->id ==
 300                      param->phyid);
 301
 302         *ifindex = cnfg->phy_layers[param->phyid].ifindex;
 303         *proto_head =
 304                 protohead[param->linktype]+
 305                 (cnfg->phy_layers[param->phyid].use_stx ? 1 : 0);
 306
 307         *proto_tail = 2;
 308
 309         /* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */
 310         cfctrl_enum_req(cnfg->ctrl, param->phyid);
 311         return cfctrl_linkup_request(cnfg->ctrl, param, adap_layer);
 312 }
 313 EXPORT_SYMBOL(cfcnfg_add_adaptation_layer);
 314
 315 static void cfcnfg_reject_rsp(struct cflayer *layer, u8 channel_id,
 316                              struct cflayer *adapt_layer)
 317 {
 318         if (adapt_layer != NULL && adapt_layer->ctrlcmd != NULL)
 319                 adapt_layer->ctrlcmd(adapt_layer,
 320                                      CAIF_CTRLCMD_INIT_FAIL_RSP, 0);
 321 }
 322
 323 static void
 324 cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv,
 325                  u8 phyid, struct cflayer *adapt_layer)
 326 {
 327         struct cfcnfg *cnfg = container_obj(layer);
 328         struct cflayer *servicel = NULL;
 329         struct cfcnfg_phyinfo *phyinfo;
 330         struct net_device *netdev;
 331
 332         if (adapt_layer == NULL) {
 333                 pr_debug("CAIF: %s(): link setup response "
 334                                 "but no client exist, send linkdown back\n",
 335                                 __func__);
 336                 cfctrl_linkdown_req(cnfg->ctrl, channel_id, NULL);
 337                 return;
 338         }
 339
 340         caif_assert(cnfg != NULL);
 341         caif_assert(phyid != 0);
 342         phyinfo = &cnfg->phy_layers[phyid];
 343         caif_assert(phyinfo->id == phyid);
 344         caif_assert(phyinfo->phy_layer != NULL);
 345         caif_assert(phyinfo->phy_layer->id == phyid);
 346
 347         phyinfo->phy_ref_count++;
 348         if (phyinfo->phy_ref_count == 1 &&
 349             phyinfo->phy_layer->modemcmd != NULL) {
 350                 phyinfo->phy_layer->modemcmd(phyinfo->phy_layer,
 351                                              _CAIF_MODEMCMD_PHYIF_USEFULL);
 352         }
 353         adapt_layer->id = channel_id;
 354
 355         switch (serv) {
 356         case CFCTRL_SRV_VEI:
 357                 servicel = cfvei_create(channel_id, &phyinfo->dev_info);
 358                 break;
 359         case CFCTRL_SRV_DATAGRAM:
 360                 servicel = cfdgml_create(channel_id, &phyinfo->dev_info);
 361                 break;
 362         case CFCTRL_SRV_RFM:
 363                 netdev = phyinfo->dev_info.dev;
 364                 servicel = cfrfml_create(channel_id, &phyinfo->dev_info,
 365                                                 netdev->mtu);
 366                 break;
 367         case CFCTRL_SRV_UTIL:
 368                 servicel = cfutill_create(channel_id, &phyinfo->dev_info);
 369                 break;
 370         case CFCTRL_SRV_VIDEO:
 371                 servicel = cfvidl_create(channel_id, &phyinfo->dev_info);
 372                 break;
 373         case CFCTRL_SRV_DBG:
 374                 servicel = cfdbgl_create(channel_id, &phyinfo->dev_info);
 375                 break;
 376         default:
 377                 pr_err("CAIF: %s(): Protocol error. "
 378                         "Link setup response - unknown channel type\n",
 379                         __func__);
 380                 return;
 381         }
 382         if (!servicel) {
 383                 pr_warning("CAIF: %s(): Out of memory\n", __func__);
 384                 return;
 385         }
 386         layer_set_dn(servicel, cnfg->mux);
 387         cfmuxl_set_uplayer(cnfg->mux, servicel, channel_id);
 388         layer_set_up(servicel, adapt_layer);
 389         layer_set_dn(adapt_layer, servicel);
 390         cfsrvl_get(servicel);
 391         servicel->ctrlcmd(servicel, CAIF_CTRLCMD_INIT_RSP, 0);
 392 }
 393
 394 void
 395 cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type,
 396                      struct net_device *dev, struct cflayer *phy_layer,
 397                      u16 *phyid, enum cfcnfg_phy_preference pref,
 398                      bool fcs, bool stx)
 399 {
 400         struct cflayer *frml;
 401         struct cflayer *phy_driver = NULL;
 402         int i;
 403
 404
 405         if (cnfg->phy_layers[cnfg->last_phyid].frm_layer == NULL) {
 406                 *phyid = cnfg->last_phyid;
 407
 408                 /* range: * 1..(MAX_PHY_LAYERS-1) */
 409                 cnfg->last_phyid =
 410                     (cnfg->last_phyid % (MAX_PHY_LAYERS - 1)) + 1;
 411         } else {
 412                 *phyid = 0;
 413                 for (i = 1; i < MAX_PHY_LAYERS; i++) {
 414                         if (cnfg->phy_layers[i].frm_layer == NULL) {
 415                                 *phyid = i;
 416                                 break;
 417                         }
 418                 }
 419         }
 420         if (*phyid == 0) {
 421                 pr_err("CAIF: %s(): No Available PHY ID\n", __func__);
 422                 return;
 423         }
 424
 425         switch (phy_type) {
 426         case CFPHYTYPE_FRAG:
 427                 phy_driver =
 428                     cfserl_create(CFPHYTYPE_FRAG, *phyid, stx);
 429                 if (!phy_driver) {
 430                         pr_warning("CAIF: %s(): Out of memory\n", __func__);
 431                         return;
 432                 }
 433
 434                 break;
 435         case CFPHYTYPE_CAIF:
 436                 phy_driver = NULL;
 437                 break;
 438         default:
 439                 pr_err("CAIF: %s(): %d", __func__, phy_type);
 440                 return;
 441                 break;
 442         }
 443
 444         phy_layer->id = *phyid;
 445         cnfg->phy_layers[*phyid].pref = pref;
 446         cnfg->phy_layers[*phyid].id = *phyid;
 447         cnfg->phy_layers[*phyid].dev_info.id = *phyid;
 448         cnfg->phy_layers[*phyid].dev_info.dev = dev;
 449         cnfg->phy_layers[*phyid].phy_layer = phy_layer;
 450         cnfg->phy_layers[*phyid].phy_ref_count = 0;
 451         cnfg->phy_layers[*phyid].ifindex = dev->ifindex;
 452         cnfg->phy_layers[*phyid].use_stx = stx;
 453         cnfg->phy_layers[*phyid].use_fcs = fcs;
 454
 455         phy_layer->type = phy_type;
 456         frml = cffrml_create(*phyid, fcs);
 457         if (!frml) {
 458                 pr_warning("CAIF: %s(): Out of memory\n", __func__);
 459                 return;
 460         }
 461         cnfg->phy_layers[*phyid].frm_layer = frml;
 462         cfmuxl_set_dnlayer(cnfg->mux, frml, *phyid);
 463         layer_set_up(frml, cnfg->mux);
 464
 465         if (phy_driver != NULL) {
 466                 phy_driver->id = *phyid;
 467                 layer_set_dn(frml, phy_driver);
 468                 layer_set_up(phy_driver, frml);
 469                 layer_set_dn(phy_driver, phy_layer);
 470                 layer_set_up(phy_layer, phy_driver);
 471         } else {
 472                 layer_set_dn(frml, phy_layer);
 473                 layer_set_up(phy_layer, frml);
 474         }
 475 }
 476 EXPORT_SYMBOL(cfcnfg_add_phy_layer);
 477
 478 int cfcnfg_del_phy_layer(struct cfcnfg *cnfg, struct cflayer *phy_layer)
 479 {
 480         struct cflayer *frml, *frml_dn;
 481         u16 phyid;
 482         phyid = phy_layer->id;
 483         caif_assert(phyid == cnfg->phy_layers[phyid].id);
 484         caif_assert(phy_layer == cnfg->phy_layers[phyid].phy_layer);
 485         caif_assert(phy_layer->id == phyid);
 486         caif_assert(cnfg->phy_layers[phyid].frm_layer->id == phyid);
 487
 488         memset(&cnfg->phy_layers[phy_layer->id], 0,
 489                sizeof(struct cfcnfg_phyinfo));
 490         frml = cfmuxl_remove_dnlayer(cnfg->mux, phy_layer->id);
 491         frml_dn = frml->dn;
 492         cffrml_set_uplayer(frml, NULL);
 493         cffrml_set_dnlayer(frml, NULL);
 494         kfree(frml);
 495
 496         if (phy_layer != frml_dn) {
 497                 layer_set_up(frml_dn, NULL);
 498                 layer_set_dn(frml_dn, NULL);
 499                 kfree(frml_dn);
 500         }
 501         layer_set_up(phy_layer, NULL);
 502         return 0;
 503 }
 504 EXPORT_SYMBOL(cfcnfg_del_phy_layer);