Pileus Git - ~andy/linux/blob - drivers/staging/ozwpan/ozproto.c

   1 /* -----------------------------------------------------------------------------
   2  * Copyright (c) 2011 Ozmo Inc
   3  * Released under the GNU General Public License Version 2 (GPLv2).
   4  * -----------------------------------------------------------------------------
   5  */
   6 #include <linux/init.h>
   7 #include <linux/module.h>
   8 #include <linux/timer.h>
   9 #include <linux/sched.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/errno.h>
  12 #include <linux/ieee80211.h>
  13 #include "ozconfig.h"
  14 #include "ozprotocol.h"
  15 #include "ozeltbuf.h"
  16 #include "ozpd.h"
  17 #include "ozproto.h"
  18 #include "ozusbsvc.h"
  19 #include "oztrace.h"
  20 #include "ozappif.h"
  21 #include "ozevent.h"
  22 #include <asm/unaligned.h>
  23 #include <linux/uaccess.h>
  24 #include <net/psnap.h>
  25 /*------------------------------------------------------------------------------
  26  */
  27 #define OZ_CF_CONN_SUCCESS      1
  28 #define OZ_CF_CONN_FAILURE      2
  29
  30 #define OZ_DO_STOP              1
  31 #define OZ_DO_SLEEP             2
  32
  33 /* States of the timer.
  34  */
  35 #define OZ_TIMER_IDLE           0
  36 #define OZ_TIMER_SET            1
  37 #define OZ_TIMER_IN_HANDLER     2
  38
  39 #define OZ_MAX_TIMER_POOL_SIZE  16
  40
  41 /*------------------------------------------------------------------------------
  42  */
  43 struct oz_binding {
  44         struct packet_type ptype;
  45         char name[OZ_MAX_BINDING_LEN];
  46         struct oz_binding *next;
  47 };
  48
  49 struct oz_timer {
  50         struct list_head link;
  51         struct oz_pd *pd;
  52         unsigned long due_time;
  53         int type;
  54 };
  55 /*------------------------------------------------------------------------------
  56  * Static external variables.
  57  */
  58 static DEFINE_SPINLOCK(g_polling_lock);
  59 static LIST_HEAD(g_pd_list);
  60 static struct oz_binding *g_binding ;
  61 static DEFINE_SPINLOCK(g_binding_lock);
  62 static struct sk_buff_head g_rx_queue;
  63 static u8 g_session_id;
  64 static u16 g_apps = 0x1;
  65 static int g_processing_rx;
  66 static struct timer_list g_timer;
  67 static struct oz_timer *g_cur_timer;
  68 static struct list_head *g_timer_pool;
  69 static int g_timer_pool_count;
  70 static int g_timer_state = OZ_TIMER_IDLE;
  71 static LIST_HEAD(g_timer_list);
  72 /*------------------------------------------------------------------------------
  73  */
  74 static void oz_protocol_timer_start(void);
  75 /*------------------------------------------------------------------------------
  76  * Context: softirq-serialized
  77  */
  78 static u8 oz_get_new_session_id(u8 exclude)
  79 {
  80         if (++g_session_id == 0)
  81                 g_session_id = 1;
  82         if (g_session_id == exclude) {
  83                 if (++g_session_id == 0)
  84                         g_session_id = 1;
  85         }
  86         return g_session_id;
  87 }
  88 /*------------------------------------------------------------------------------
  89  * Context: softirq-serialized
  90  */
  91 static void oz_send_conn_rsp(struct oz_pd *pd, u8 status)
  92 {
  93         struct sk_buff *skb;
  94         struct net_device *dev = pd->net_dev;
  95         struct oz_hdr *oz_hdr;
  96         struct oz_elt *elt;
  97         struct oz_elt_connect_rsp *body;
  98         int sz = sizeof(struct oz_hdr) + sizeof(struct oz_elt) +
  99                         sizeof(struct oz_elt_connect_rsp);
 100         skb = alloc_skb(sz + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 101         if (skb == 0)
 102                 return;
 103         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 104         skb_reset_network_header(skb);
 105         oz_hdr = (struct oz_hdr *)skb_put(skb, sz);
 106         elt = (struct oz_elt *)(oz_hdr+1);
 107         body = (struct oz_elt_connect_rsp *)(elt+1);
 108         skb->dev = dev;
 109         skb->protocol = htons(OZ_ETHERTYPE);
 110         /* Fill in device header */
 111         if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr,
 112                         dev->dev_addr, skb->len) < 0) {
 113                 kfree_skb(skb);
 114                 return;
 115         }
 116         oz_hdr->control = (OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT);
 117         oz_hdr->last_pkt_num = 0;
 118         put_unaligned(0, &oz_hdr->pkt_num);
 119         oz_event_log(OZ_EVT_CONNECT_RSP, 0, 0, 0, 0);
 120         elt->type = OZ_ELT_CONNECT_RSP;
 121         elt->length = sizeof(struct oz_elt_connect_rsp);
 122         memset(body, 0, sizeof(struct oz_elt_connect_rsp));
 123         body->status = status;
 124         if (status == 0) {
 125                 body->mode = pd->mode;
 126                 body->session_id = pd->session_id;
 127                 put_unaligned(cpu_to_le16(pd->total_apps), &body->apps);
 128         }
 129         oz_trace("TX: OZ_ELT_CONNECT_RSP %d", status);
 130         dev_queue_xmit(skb);
 131         return;
 132 }
 133 /*------------------------------------------------------------------------------
 134  * Context: softirq-serialized
 135  */
 136 static void pd_set_keepalive(struct oz_pd *pd, u8 kalive)
 137 {
 138         unsigned long keep_alive = kalive & OZ_KALIVE_VALUE_MASK;
 139
 140         switch (kalive & OZ_KALIVE_TYPE_MASK) {
 141         case OZ_KALIVE_SPECIAL:
 142                 pd->keep_alive_j =
 143                         oz_ms_to_jiffies(keep_alive * 1000*60*60*24*20);
 144                 break;
 145         case OZ_KALIVE_SECS:
 146                 pd->keep_alive_j = oz_ms_to_jiffies(keep_alive*1000);
 147                 break;
 148         case OZ_KALIVE_MINS:
 149                 pd->keep_alive_j = oz_ms_to_jiffies(keep_alive*1000*60);
 150                 break;
 151         case OZ_KALIVE_HOURS:
 152                 pd->keep_alive_j = oz_ms_to_jiffies(keep_alive*1000*60*60);
 153                 break;
 154         default:
 155                 pd->keep_alive_j = 0;
 156         }
 157         oz_trace("Keepalive = %lu jiffies\n", pd->keep_alive_j);
 158 }
 159 /*------------------------------------------------------------------------------
 160  * Context: softirq-serialized
 161  */
 162 static void pd_set_presleep(struct oz_pd *pd, u8 presleep)
 163 {
 164         if (presleep)
 165                 pd->presleep_j = oz_ms_to_jiffies(presleep*100);
 166         else
 167                 pd->presleep_j = OZ_PRESLEEP_TOUT_J;
 168         oz_trace("Presleep time = %lu jiffies\n", pd->presleep_j);
 169 }
 170 /*------------------------------------------------------------------------------
 171  * Context: softirq-serialized
 172  */
 173 static struct oz_pd *oz_connect_req(struct oz_pd *cur_pd, struct oz_elt *elt,
 174                         u8 *pd_addr, struct net_device *net_dev)
 175 {
 176         struct oz_pd *pd;
 177         struct oz_elt_connect_req *body =
 178                         (struct oz_elt_connect_req *)(elt+1);
 179         u8 rsp_status = OZ_STATUS_SUCCESS;
 180         u8 stop_needed = 0;
 181         u16 new_apps = g_apps;
 182         struct net_device *old_net_dev = 0;
 183         struct oz_pd *free_pd = 0;
 184         if (cur_pd) {
 185                 pd = cur_pd;
 186                 spin_lock_bh(&g_polling_lock);
 187         } else {
 188                 struct oz_pd *pd2 = 0;
 189                 struct list_head *e;
 190                 pd = oz_pd_alloc(pd_addr);
 191                 if (pd == 0)
 192                         return 0;
 193                 pd->last_rx_time_j = jiffies;
 194                 spin_lock_bh(&g_polling_lock);
 195                 list_for_each(e, &g_pd_list) {
 196                         pd2 = container_of(e, struct oz_pd, link);
 197                         if (memcmp(pd2->mac_addr, pd_addr, ETH_ALEN) == 0) {
 198                                 free_pd = pd;
 199                                 pd = pd2;
 200                                 break;
 201                         }
 202                 }
 203                 if (pd != pd2)
 204                         list_add_tail(&pd->link, &g_pd_list);
 205         }
 206         if (pd == 0) {
 207                 spin_unlock_bh(&g_polling_lock);
 208                 return 0;
 209         }
 210         if (pd->net_dev != net_dev) {
 211                 old_net_dev = pd->net_dev;
 212                 dev_hold(net_dev);
 213                 pd->net_dev = net_dev;
 214         }
 215         oz_trace("Host vendor: %d\n", body->host_vendor);
 216         pd->max_tx_size = OZ_MAX_TX_SIZE;
 217         pd->mode = body->mode;
 218         pd->pd_info = body->pd_info;
 219         if (pd->mode & OZ_F_ISOC_NO_ELTS) {
 220                 pd->mode |= OZ_F_ISOC_ANYTIME;
 221                 pd->ms_per_isoc = body->ms_per_isoc;
 222                 if (!pd->ms_per_isoc)
 223                         pd->ms_per_isoc = 4;
 224         }
 225         if (body->max_len_div16)
 226                 pd->max_tx_size = ((u16)body->max_len_div16)<<4;
 227         oz_trace("Max frame:%u Ms per isoc:%u\n",
 228                 pd->max_tx_size, pd->ms_per_isoc);
 229         pd->max_stream_buffering = 3*1024;
 230         pd->timeout_time_j = jiffies + OZ_CONNECTION_TOUT_J;
 231         pd->pulse_period_j = OZ_QUANTUM_J;
 232         pd_set_presleep(pd, body->presleep);
 233         pd_set_keepalive(pd, body->keep_alive);
 234
 235         new_apps &= le16_to_cpu(get_unaligned(&body->apps));
 236         if ((new_apps & 0x1) && (body->session_id)) {
 237                 if (pd->session_id) {
 238                         if (pd->session_id != body->session_id) {
 239                                 rsp_status = OZ_STATUS_SESSION_MISMATCH;
 240                                 goto done;
 241                         }
 242                 } else {
 243                         new_apps &= ~0x1;  /* Resume not permitted */
 244                         pd->session_id =
 245                                 oz_get_new_session_id(body->session_id);
 246                 }
 247         } else {
 248                 if (pd->session_id && !body->session_id) {
 249                         rsp_status = OZ_STATUS_SESSION_TEARDOWN;
 250                         stop_needed = 1;
 251                 } else {
 252                         new_apps &= ~0x1;  /* Resume not permitted */
 253                         pd->session_id =
 254                                 oz_get_new_session_id(body->session_id);
 255                 }
 256         }
 257 done:
 258         if (rsp_status == OZ_STATUS_SUCCESS) {
 259                 u16 start_apps = new_apps & ~pd->total_apps & ~0x1;
 260                 u16 stop_apps = pd->total_apps & ~new_apps & ~0x1;
 261                 u16 resume_apps = new_apps & pd->paused_apps  & ~0x1;
 262                 spin_unlock_bh(&g_polling_lock);
 263                 oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
 264                 oz_timer_delete(pd, OZ_TIMER_STOP);
 265                 oz_trace("new_apps=0x%x total_apps=0x%x paused_apps=0x%x\n",
 266                         new_apps, pd->total_apps, pd->paused_apps);
 267                 if (start_apps) {
 268                         if (oz_services_start(pd, start_apps, 0))
 269                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 270                 }
 271                 if (resume_apps)
 272                         if (oz_services_start(pd, resume_apps, 1))
 273                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 274                 if (stop_apps)
 275                         oz_services_stop(pd, stop_apps, 0);
 276                 oz_pd_request_heartbeat(pd);
 277         } else {
 278                 spin_unlock_bh(&g_polling_lock);
 279         }
 280         oz_send_conn_rsp(pd, rsp_status);
 281         if (rsp_status != OZ_STATUS_SUCCESS) {
 282                 if (stop_needed)
 283                         oz_pd_stop(pd);
 284                 oz_pd_put(pd);
 285                 pd = 0;
 286         }
 287         if (old_net_dev)
 288                 dev_put(old_net_dev);
 289         if (free_pd)
 290                 oz_pd_destroy(free_pd);
 291         return pd;
 292 }
 293 /*------------------------------------------------------------------------------
 294  * Context: softirq-serialized
 295  */
 296 static void oz_add_farewell(struct oz_pd *pd, u8 ep_num, u8 index,
 297                         u8 *report, u8 len)
 298 {
 299         struct oz_farewell *f;
 300         struct oz_farewell *f2;
 301         int found = 0;
 302         f = kmalloc(sizeof(struct oz_farewell) + len - 1, GFP_ATOMIC);
 303         if (!f)
 304                 return;
 305         f->ep_num = ep_num;
 306         f->index = index;
 307         memcpy(f->report, report, len);
 308         oz_trace("RX: Adding farewell report\n");
 309         spin_lock(&g_polling_lock);
 310         list_for_each_entry(f2, &pd->farewell_list, link) {
 311                 if ((f2->ep_num == ep_num) && (f2->index == index)) {
 312                         found = 1;
 313                         list_del(&f2->link);
 314                         break;
 315                 }
 316         }
 317         list_add_tail(&f->link, &pd->farewell_list);
 318         spin_unlock(&g_polling_lock);
 319         if (found)
 320                 kfree(f2);
 321 }
 322 /*------------------------------------------------------------------------------
 323  * Context: softirq-serialized
 324  */
 325 static void oz_rx_frame(struct sk_buff *skb)
 326 {
 327         u8 *mac_hdr;
 328         u8 *src_addr;
 329         struct oz_elt *elt;
 330         int length;
 331         struct oz_pd *pd = 0;
 332         struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb);
 333         int dup = 0;
 334         u32 pkt_num;
 335
 336         oz_event_log(OZ_EVT_RX_PROCESS, 0,
 337                 (((u16)oz_hdr->control)<<8)|oz_hdr->last_pkt_num,
 338                 0, oz_hdr->pkt_num);
 339         oz_trace2(OZ_TRACE_RX_FRAMES,
 340                 "RX frame PN=0x%x LPN=0x%x control=0x%x\n",
 341                 oz_hdr->pkt_num, oz_hdr->last_pkt_num, oz_hdr->control);
 342         mac_hdr = skb_mac_header(skb);
 343         src_addr = &mac_hdr[ETH_ALEN] ;
 344         length = skb->len;
 345
 346         /* Check the version field */
 347         if (oz_get_prot_ver(oz_hdr->control) != OZ_PROTOCOL_VERSION) {
 348                 oz_trace("Incorrect protocol version: %d\n",
 349                         oz_get_prot_ver(oz_hdr->control));
 350                 goto done;
 351         }
 352
 353         pkt_num = le32_to_cpu(get_unaligned(&oz_hdr->pkt_num));
 354
 355         pd = oz_pd_find(src_addr);
 356         if (pd) {
 357                 pd->last_rx_time_j = jiffies;
 358                 oz_timer_add(pd, OZ_TIMER_TOUT,
 359                         pd->last_rx_time_j + pd->presleep_j, 1);
 360                 if (pkt_num != pd->last_rx_pkt_num) {
 361                         pd->last_rx_pkt_num = pkt_num;
 362                 } else {
 363                         dup = 1;
 364                         oz_trace("Duplicate frame\n");
 365                 }
 366         }
 367
 368         if (pd && !dup && ((pd->mode & OZ_MODE_MASK) == OZ_MODE_TRIGGERED)) {
 369                 pd->last_sent_frame = &pd->tx_queue;
 370                 if (oz_hdr->control & OZ_F_ACK) {
 371                         /* Retire completed frames */
 372                         oz_retire_tx_frames(pd, oz_hdr->last_pkt_num);
 373                 }
 374                 if ((oz_hdr->control & OZ_F_ACK_REQUESTED) &&
 375                                 (pd->state == OZ_PD_S_CONNECTED)) {
 376                         int backlog = pd->nb_queued_frames;
 377                         pd->trigger_pkt_num = pkt_num;
 378                         /* Send queued frames */
 379                         while (oz_prepare_frame(pd, 0) >= 0)
 380                                 ;
 381                         oz_send_queued_frames(pd, backlog);
 382                 }
 383         }
 384
 385         length -= sizeof(struct oz_hdr);
 386         elt = (struct oz_elt *)((u8 *)oz_hdr + sizeof(struct oz_hdr));
 387
 388         while (length >= sizeof(struct oz_elt)) {
 389                 length -= sizeof(struct oz_elt) + elt->length;
 390                 if (length < 0)
 391                         break;
 392                 switch (elt->type) {
 393                 case OZ_ELT_CONNECT_REQ:
 394                         oz_event_log(OZ_EVT_CONNECT_REQ, 0, 0, 0, 0);
 395                         oz_trace("RX: OZ_ELT_CONNECT_REQ\n");
 396                         pd = oz_connect_req(pd, elt, src_addr, skb->dev);
 397                         break;
 398                 case OZ_ELT_DISCONNECT:
 399                         oz_trace("RX: OZ_ELT_DISCONNECT\n");
 400                         if (pd)
 401                                 oz_pd_sleep(pd);
 402                         break;
 403                 case OZ_ELT_UPDATE_PARAM_REQ: {
 404                                 struct oz_elt_update_param *body =
 405                                         (struct oz_elt_update_param *)(elt + 1);
 406                                 oz_trace("RX: OZ_ELT_UPDATE_PARAM_REQ\n");
 407                                 if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 408                                         spin_lock(&g_polling_lock);
 409                                         pd_set_keepalive(pd, body->keepalive);
 410                                         pd_set_presleep(pd, body->presleep);
 411                                         spin_unlock(&g_polling_lock);
 412                                 }
 413                         }
 414                         break;
 415                 case OZ_ELT_FAREWELL_REQ: {
 416                                 struct oz_elt_farewell *body =
 417                                         (struct oz_elt_farewell *)(elt + 1);
 418                                 oz_trace("RX: OZ_ELT_FAREWELL_REQ\n");
 419                                 oz_add_farewell(pd, body->ep_num,
 420                                         body->index, body->report,
 421                                         elt->length + 1 - sizeof(*body));
 422                         }
 423                         break;
 424                 case OZ_ELT_APP_DATA:
 425                         if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 426                                 struct oz_app_hdr *app_hdr =
 427                                         (struct oz_app_hdr *)(elt+1);
 428                                 if (dup)
 429                                         break;
 430                                 oz_handle_app_elt(pd, app_hdr->app_id, elt);
 431                         }
 432                         break;
 433                 default:
 434                         oz_trace("RX: Unknown elt %02x\n", elt->type);
 435                 }
 436                 elt = oz_next_elt(elt);
 437         }
 438 done:
 439         if (pd)
 440                 oz_pd_put(pd);
 441         consume_skb(skb);
 442 }
 443 /*------------------------------------------------------------------------------
 444  * Context: process
 445  */
 446 void oz_protocol_term(void)
 447 {
 448         struct list_head *chain = 0;
 449         del_timer_sync(&g_timer);
 450         /* Walk the list of bindings and remove each one.
 451          */
 452         spin_lock_bh(&g_binding_lock);
 453         while (g_binding) {
 454                 struct oz_binding *b = g_binding;
 455                 g_binding = b->next;
 456                 spin_unlock_bh(&g_binding_lock);
 457                 dev_remove_pack(&b->ptype);
 458                 if (b->ptype.dev)
 459                         dev_put(b->ptype.dev);
 460                 kfree(b);
 461                 spin_lock_bh(&g_binding_lock);
 462         }
 463         spin_unlock_bh(&g_binding_lock);
 464         /* Walk the list of PDs and stop each one. This causes the PD to be
 465          * removed from the list so we can just pull each one from the head
 466          * of the list.
 467          */
 468         spin_lock_bh(&g_polling_lock);
 469         while (!list_empty(&g_pd_list)) {
 470                 struct oz_pd *pd =
 471                         list_first_entry(&g_pd_list, struct oz_pd, link);
 472                 oz_pd_get(pd);
 473                 spin_unlock_bh(&g_polling_lock);
 474                 oz_pd_stop(pd);
 475                 oz_pd_put(pd);
 476                 spin_lock_bh(&g_polling_lock);
 477         }
 478         chain = g_timer_pool;
 479         g_timer_pool = 0;
 480         spin_unlock_bh(&g_polling_lock);
 481         while (chain) {
 482                 struct oz_timer *t = container_of(chain, struct oz_timer, link);
 483                 chain = chain->next;
 484                 kfree(t);
 485         }
 486         oz_trace("Protocol stopped\n");
 487 }
 488 /*------------------------------------------------------------------------------
 489  * Context: softirq
 490  */
 491 static void oz_pd_handle_timer(struct oz_pd *pd, int type)
 492 {
 493         switch (type) {
 494         case OZ_TIMER_TOUT:
 495                 oz_pd_sleep(pd);
 496                 break;
 497         case OZ_TIMER_STOP:
 498                 oz_pd_stop(pd);
 499                 break;
 500         case OZ_TIMER_HEARTBEAT: {
 501                         u16 apps = 0;
 502                         spin_lock_bh(&g_polling_lock);
 503                         pd->heartbeat_requested = 0;
 504                         if (pd->state & OZ_PD_S_CONNECTED)
 505                                 apps = pd->total_apps;
 506                         spin_unlock_bh(&g_polling_lock);
 507                         if (apps)
 508                                 oz_pd_heartbeat(pd, apps);
 509                 }
 510                 break;
 511         }
 512 }
 513 /*------------------------------------------------------------------------------
 514  * Context: softirq
 515  */
 516 static void oz_protocol_timer(unsigned long arg)
 517 {
 518         struct oz_timer *t;
 519         struct oz_timer *t2;
 520         struct oz_pd *pd;
 521         spin_lock_bh(&g_polling_lock);
 522         if (!g_cur_timer) {
 523                 /* This happens if we remove the current timer but can't stop
 524                  * the timer from firing. In this case just get out.
 525                  */
 526                 oz_event_log(OZ_EVT_TIMER, 0, 0, 0, 0);
 527                 spin_unlock_bh(&g_polling_lock);
 528                 return;
 529         }
 530         g_timer_state = OZ_TIMER_IN_HANDLER;
 531         t = g_cur_timer;
 532         g_cur_timer = 0;
 533         list_del(&t->link);
 534         spin_unlock_bh(&g_polling_lock);
 535         do {
 536                 pd = t->pd;
 537                 oz_event_log(OZ_EVT_TIMER, 0, t->type, 0, 0);
 538                 oz_pd_handle_timer(pd, t->type);
 539                 spin_lock_bh(&g_polling_lock);
 540                 if (g_timer_pool_count < OZ_MAX_TIMER_POOL_SIZE) {
 541                         t->link.next = g_timer_pool;
 542                         g_timer_pool = &t->link;
 543                         g_timer_pool_count++;
 544                         t = 0;
 545                 }
 546                 if (!list_empty(&g_timer_list)) {
 547                         t2 =  container_of(g_timer_list.next,
 548                                 struct oz_timer, link);
 549                         if (time_before_eq(t2->due_time, jiffies))
 550                                 list_del(&t2->link);
 551                         else
 552                                 t2 = 0;
 553                 } else {
 554                         t2 = 0;
 555                 }
 556                 spin_unlock_bh(&g_polling_lock);
 557                 oz_pd_put(pd);
 558                 if (t)
 559                         kfree(t);
 560                 t = t2;
 561         } while (t);
 562         g_timer_state = OZ_TIMER_IDLE;
 563         oz_protocol_timer_start();
 564 }
 565 /*------------------------------------------------------------------------------
 566  * Context: softirq
 567  */
 568 static void oz_protocol_timer_start(void)
 569 {
 570         spin_lock_bh(&g_polling_lock);
 571         if (!list_empty(&g_timer_list)) {
 572                 g_cur_timer =
 573                         container_of(g_timer_list.next, struct oz_timer, link);
 574                 if (g_timer_state == OZ_TIMER_SET) {
 575                         oz_event_log(OZ_EVT_TIMER_CTRL, 3,
 576                                 (u16)g_cur_timer->type, 0,
 577                                 (unsigned)g_cur_timer->due_time);
 578                         mod_timer(&g_timer, g_cur_timer->due_time);
 579                 } else {
 580                         oz_event_log(OZ_EVT_TIMER_CTRL, 4,
 581                                 (u16)g_cur_timer->type, 0,
 582                                 (unsigned)g_cur_timer->due_time);
 583                         g_timer.expires = g_cur_timer->due_time;
 584                         g_timer.function = oz_protocol_timer;
 585                         g_timer.data = 0;
 586                         add_timer(&g_timer);
 587                 }
 588                 g_timer_state = OZ_TIMER_SET;
 589         } else {
 590                 oz_trace("No queued timers\n");
 591         }
 592         spin_unlock_bh(&g_polling_lock);
 593 }
 594 /*------------------------------------------------------------------------------
 595  * Context: softirq or process
 596  */
 597 void oz_timer_add(struct oz_pd *pd, int type, unsigned long due_time,
 598                 int remove)
 599 {
 600         struct list_head *e;
 601         struct oz_timer *t = 0;
 602         int restart_needed = 0;
 603         oz_event_log(OZ_EVT_TIMER_CTRL, 1, (u16)type, 0, (unsigned)due_time);
 604         spin_lock(&g_polling_lock);
 605         if (remove) {
 606                 list_for_each(e, &g_timer_list) {
 607                         t = container_of(e, struct oz_timer, link);
 608                         if ((t->pd == pd) && (t->type == type)) {
 609                                 if (g_cur_timer == t) {
 610                                         restart_needed = 1;
 611                                         g_cur_timer = 0;
 612                                 }
 613                                 list_del(e);
 614                                 break;
 615                         }
 616                         t = 0;
 617                 }
 618         }
 619         if (!t) {
 620                 if (g_timer_pool) {
 621                         t = container_of(g_timer_pool, struct oz_timer, link);
 622                         g_timer_pool = g_timer_pool->next;
 623                         g_timer_pool_count--;
 624                 } else {
 625                         t = kmalloc(sizeof(struct oz_timer), GFP_ATOMIC);
 626                 }
 627                 if (t) {
 628                         t->pd = pd;
 629                         t->type = type;
 630                         oz_pd_get(pd);
 631                 }
 632         }
 633         if (t) {
 634                 struct oz_timer *t2;
 635                 t->due_time = due_time;
 636                 list_for_each(e, &g_timer_list) {
 637                         t2 = container_of(e, struct oz_timer, link);
 638                         if (time_before(due_time, t2->due_time)) {
 639                                 if (t2 == g_cur_timer) {
 640                                         g_cur_timer = 0;
 641                                         restart_needed = 1;
 642                                 }
 643                                 break;
 644                         }
 645                 }
 646                 list_add_tail(&t->link, e);
 647         }
 648         if (g_timer_state == OZ_TIMER_IDLE)
 649                 restart_needed = 1;
 650         else if (g_timer_state == OZ_TIMER_IN_HANDLER)
 651                 restart_needed = 0;
 652         spin_unlock(&g_polling_lock);
 653         if (restart_needed)
 654                 oz_protocol_timer_start();
 655 }
 656 /*------------------------------------------------------------------------------
 657  * Context: softirq or process
 658  */
 659 void oz_timer_delete(struct oz_pd *pd, int type)
 660 {
 661         struct list_head *chain = 0;
 662         struct oz_timer *t;
 663         struct oz_timer *n;
 664         int restart_needed = 0;
 665         int release = 0;
 666         oz_event_log(OZ_EVT_TIMER_CTRL, 2, (u16)type, 0, 0);
 667         spin_lock(&g_polling_lock);
 668         list_for_each_entry_safe(t, n, &g_timer_list, link) {
 669                 if ((t->pd == pd) && ((type == 0) || (t->type == type))) {
 670                         if (g_cur_timer == t) {
 671                                 restart_needed = 1;
 672                                 g_cur_timer = 0;
 673                                 del_timer(&g_timer);
 674                         }
 675                         list_del(&t->link);
 676                         release++;
 677                         if (g_timer_pool_count < OZ_MAX_TIMER_POOL_SIZE) {
 678                                 t->link.next = g_timer_pool;
 679                                 g_timer_pool = &t->link;
 680                                 g_timer_pool_count++;
 681                         } else {
 682                                 t->link.next = chain;
 683                                 chain = &t->link;
 684                         }
 685                         if (type)
 686                                 break;
 687                 }
 688         }
 689         if (g_timer_state == OZ_TIMER_IN_HANDLER)
 690                 restart_needed = 0;
 691         else if (restart_needed)
 692                 g_timer_state = OZ_TIMER_IDLE;
 693         spin_unlock(&g_polling_lock);
 694         if (restart_needed)
 695                 oz_protocol_timer_start();
 696         while (release--)
 697                 oz_pd_put(pd);
 698         while (chain) {
 699                 t = container_of(chain, struct oz_timer, link);
 700                 chain = chain->next;
 701                 kfree(t);
 702         }
 703 }
 704 /*------------------------------------------------------------------------------
 705  * Context: softirq or process
 706  */
 707 void oz_pd_request_heartbeat(struct oz_pd *pd)
 708 {
 709         unsigned long now = jiffies;
 710         unsigned long t;
 711         spin_lock(&g_polling_lock);
 712         if (pd->heartbeat_requested) {
 713                 spin_unlock(&g_polling_lock);
 714                 return;
 715         }
 716         if (pd->pulse_period_j)
 717                 t = ((now / pd->pulse_period_j) + 1) * pd->pulse_period_j;
 718         else
 719                 t = now + 1;
 720         pd->heartbeat_requested = 1;
 721         spin_unlock(&g_polling_lock);
 722         oz_timer_add(pd, OZ_TIMER_HEARTBEAT, t, 0);
 723 }
 724 /*------------------------------------------------------------------------------
 725  * Context: softirq or process
 726  */
 727 struct oz_pd *oz_pd_find(u8 *mac_addr)
 728 {
 729         struct oz_pd *pd;
 730         struct list_head *e;
 731         spin_lock_bh(&g_polling_lock);
 732         list_for_each(e, &g_pd_list) {
 733                 pd = container_of(e, struct oz_pd, link);
 734                 if (memcmp(pd->mac_addr, mac_addr, ETH_ALEN) == 0) {
 735                         atomic_inc(&pd->ref_count);
 736                         spin_unlock_bh(&g_polling_lock);
 737                         return pd;
 738                 }
 739         }
 740         spin_unlock_bh(&g_polling_lock);
 741         return 0;
 742 }
 743 /*------------------------------------------------------------------------------
 744  * Context: process
 745  */
 746 void oz_app_enable(int app_id, int enable)
 747 {
 748         if (app_id <= OZ_APPID_MAX) {
 749                 spin_lock_bh(&g_polling_lock);
 750                 if (enable)
 751                         g_apps |= (1<<app_id);
 752                 else
 753                         g_apps &= ~(1<<app_id);
 754                 spin_unlock_bh(&g_polling_lock);
 755         }
 756 }
 757 /*------------------------------------------------------------------------------
 758  * Context: softirq
 759  */
 760 static int oz_pkt_recv(struct sk_buff *skb, struct net_device *dev,
 761                 struct packet_type *pt, struct net_device *orig_dev)
 762 {
 763         oz_event_log(OZ_EVT_RX_FRAME, 0, 0, 0, 0);
 764         skb = skb_share_check(skb, GFP_ATOMIC);
 765         if (skb == 0)
 766                 return 0;
 767         spin_lock_bh(&g_rx_queue.lock);
 768         if (g_processing_rx) {
 769                 /* We already hold the lock so use __ variant.
 770                  */
 771                 __skb_queue_head(&g_rx_queue, skb);
 772                 spin_unlock_bh(&g_rx_queue.lock);
 773         } else {
 774                 g_processing_rx = 1;
 775                 do {
 776
 777                         spin_unlock_bh(&g_rx_queue.lock);
 778                         oz_rx_frame(skb);
 779                         spin_lock_bh(&g_rx_queue.lock);
 780                         if (skb_queue_empty(&g_rx_queue)) {
 781                                 g_processing_rx = 0;
 782                                 spin_unlock_bh(&g_rx_queue.lock);
 783                                 break;
 784                         }
 785                         /* We already hold the lock so use __ variant.
 786                          */
 787                         skb = __skb_dequeue(&g_rx_queue);
 788                 } while (1);
 789         }
 790         return 0;
 791 }
 792 /*------------------------------------------------------------------------------
 793  * Context: process
 794  */
 795 void oz_binding_add(char *net_dev)
 796 {
 797         struct oz_binding *binding;
 798
 799         binding = kmalloc(sizeof(struct oz_binding), GFP_ATOMIC);
 800         if (binding) {
 801                 binding->ptype.type = __constant_htons(OZ_ETHERTYPE);
 802                 binding->ptype.func = oz_pkt_recv;
 803                 memcpy(binding->name, net_dev, OZ_MAX_BINDING_LEN);
 804                 if (net_dev && *net_dev) {
 805                         oz_trace("Adding binding: %s\n", net_dev);
 806                         binding->ptype.dev =
 807                                 dev_get_by_name(&init_net, net_dev);
 808                         if (binding->ptype.dev == 0) {
 809                                 oz_trace("Netdev %s not found\n", net_dev);
 810                                 kfree(binding);
 811                                 binding = 0;
 812                         }
 813                 } else {
 814                         oz_trace("Binding to all netcards\n");
 815                         binding->ptype.dev = 0;
 816                 }
 817                 if (binding) {
 818                         dev_add_pack(&binding->ptype);
 819                         spin_lock_bh(&g_binding_lock);
 820                         binding->next = g_binding;
 821                         g_binding = binding;
 822                         spin_unlock_bh(&g_binding_lock);
 823                 }
 824         }
 825 }
 826 /*------------------------------------------------------------------------------
 827  * Context: process
 828  */
 829 static int compare_binding_name(char *s1, char *s2)
 830 {
 831         int i;
 832         for (i = 0; i < OZ_MAX_BINDING_LEN; i++) {
 833                 if (*s1 != *s2)
 834                         return 0;
 835                 if (!*s1++)
 836                         return 1;
 837                 s2++;
 838         }
 839         return 1;
 840 }
 841 /*------------------------------------------------------------------------------
 842  * Context: process
 843  */
 844 static void pd_stop_all_for_device(struct net_device *net_dev)
 845 {
 846         struct list_head h;
 847         struct oz_pd *pd;
 848         struct oz_pd *n;
 849         INIT_LIST_HEAD(&h);
 850         spin_lock_bh(&g_polling_lock);
 851         list_for_each_entry_safe(pd, n, &g_pd_list, link) {
 852                 if (pd->net_dev == net_dev) {
 853                         list_move(&pd->link, &h);
 854                         oz_pd_get(pd);
 855                 }
 856         }
 857         spin_unlock_bh(&g_polling_lock);
 858         while (!list_empty(&h)) {
 859                 pd = list_first_entry(&h, struct oz_pd, link);
 860                 oz_pd_stop(pd);
 861                 oz_pd_put(pd);
 862         }
 863 }
 864 /*------------------------------------------------------------------------------
 865  * Context: process
 866  */
 867 void oz_binding_remove(char *net_dev)
 868 {
 869         struct oz_binding *binding = 0;
 870         struct oz_binding **link;
 871         oz_trace("Removing binding: %s\n", net_dev);
 872         spin_lock_bh(&g_binding_lock);
 873         binding = g_binding;
 874         link = &g_binding;
 875         while (binding) {
 876                 if (compare_binding_name(binding->name, net_dev)) {
 877                         oz_trace("Binding '%s' found\n", net_dev);
 878                         *link = binding->next;
 879                         break;
 880                 } else {
 881                         link = &binding;
 882                         binding = binding->next;
 883                 }
 884         }
 885         spin_unlock_bh(&g_binding_lock);
 886         if (binding) {
 887                 dev_remove_pack(&binding->ptype);
 888                 if (binding->ptype.dev) {
 889                         dev_put(binding->ptype.dev);
 890                         pd_stop_all_for_device(binding->ptype.dev);
 891                 }
 892                 kfree(binding);
 893         }
 894 }
 895 /*------------------------------------------------------------------------------
 896  * Context: process
 897  */
 898 static char *oz_get_next_device_name(char *s, char *dname, int max_size)
 899 {
 900         while (*s == ',')
 901                 s++;
 902         while (*s && (*s != ',') && max_size > 1) {
 903                 *dname++ = *s++;
 904                 max_size--;
 905         }
 906         *dname = 0;
 907         return s;
 908 }
 909 /*------------------------------------------------------------------------------
 910  * Context: process
 911  */
 912 int oz_protocol_init(char *devs)
 913 {
 914         skb_queue_head_init(&g_rx_queue);
 915         if (devs && (devs[0] == '*')) {
 916                 oz_binding_add(0);
 917         } else {
 918                 char d[32];
 919                 while (*devs) {
 920                         devs = oz_get_next_device_name(devs, d, sizeof(d));
 921                         if (d[0])
 922                                 oz_binding_add(d);
 923                 }
 924         }
 925         init_timer(&g_timer);
 926         return 0;
 927 }
 928 /*------------------------------------------------------------------------------
 929  * Context: process
 930  */
 931 int oz_get_pd_list(struct oz_mac_addr *addr, int max_count)
 932 {
 933         struct oz_pd *pd;
 934         struct list_head *e;
 935         int count = 0;
 936         spin_lock_bh(&g_polling_lock);
 937         list_for_each(e, &g_pd_list) {
 938                 if (count >= max_count)
 939                         break;
 940                 pd = container_of(e, struct oz_pd, link);
 941                 memcpy(&addr[count++], pd->mac_addr, ETH_ALEN);
 942         }
 943         spin_unlock_bh(&g_polling_lock);
 944         return count;
 945 }
 946 /*------------------------------------------------------------------------------
 947 */
 948 void oz_polling_lock_bh(void)
 949 {
 950         spin_lock_bh(&g_polling_lock);
 951 }
 952 /*------------------------------------------------------------------------------
 953 */
 954 void oz_polling_unlock_bh(void)
 955 {
 956         spin_unlock_bh(&g_polling_lock);
 957 }