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 = dev_alloc_skb(sz + OZ_ALLOCATED_SPACE(dev));
 101         if (skb == NULL)
 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, NULL, 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                         const 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 = NULL;
 183         struct oz_pd *free_pd = NULL;
 184         if (cur_pd) {
 185                 pd = cur_pd;
 186                 spin_lock_bh(&g_polling_lock);
 187         } else {
 188                 struct oz_pd *pd2 = NULL;
 189                 struct list_head *e;
 190                 pd = oz_pd_alloc(pd_addr);
 191                 if (pd == NULL)
 192                         return NULL;
 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 == NULL) {
 207                 spin_unlock_bh(&g_polling_lock);
 208                 return NULL;
 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->ms_per_isoc = body->ms_per_isoc;
 221                 if (!pd->ms_per_isoc)
 222                         pd->ms_per_isoc = 4;
 223
 224                 switch (body->ms_isoc_latency & OZ_LATENCY_MASK) {
 225                 case OZ_ONE_MS_LATENCY:
 226                         pd->isoc_latency = (body->ms_isoc_latency &
 227                                         ~OZ_LATENCY_MASK) / pd->ms_per_isoc;
 228                         break;
 229                 case OZ_TEN_MS_LATENCY:
 230                         pd->isoc_latency = ((body->ms_isoc_latency &
 231                                 ~OZ_LATENCY_MASK) * 10) / pd->ms_per_isoc;
 232                         break;
 233                 default:
 234                         pd->isoc_latency = OZ_MAX_TX_QUEUE_ISOC;
 235                 }
 236         }
 237         if (body->max_len_div16)
 238                 pd->max_tx_size = ((u16)body->max_len_div16)<<4;
 239         oz_trace("Max frame:%u Ms per isoc:%u\n",
 240                 pd->max_tx_size, pd->ms_per_isoc);
 241         pd->max_stream_buffering = 3*1024;
 242         pd->timeout_time_j = jiffies + OZ_CONNECTION_TOUT_J;
 243         pd->pulse_period_j = OZ_QUANTUM_J;
 244         pd_set_presleep(pd, body->presleep);
 245         pd_set_keepalive(pd, body->keep_alive);
 246
 247         new_apps &= le16_to_cpu(get_unaligned(&body->apps));
 248         if ((new_apps & 0x1) && (body->session_id)) {
 249                 if (pd->session_id) {
 250                         if (pd->session_id != body->session_id) {
 251                                 rsp_status = OZ_STATUS_SESSION_MISMATCH;
 252                                 goto done;
 253                         }
 254                 } else {
 255                         new_apps &= ~0x1;  /* Resume not permitted */
 256                         pd->session_id =
 257                                 oz_get_new_session_id(body->session_id);
 258                 }
 259         } else {
 260                 if (pd->session_id && !body->session_id) {
 261                         rsp_status = OZ_STATUS_SESSION_TEARDOWN;
 262                         stop_needed = 1;
 263                 } else {
 264                         new_apps &= ~0x1;  /* Resume not permitted */
 265                         pd->session_id =
 266                                 oz_get_new_session_id(body->session_id);
 267                 }
 268         }
 269 done:
 270         if (rsp_status == OZ_STATUS_SUCCESS) {
 271                 u16 start_apps = new_apps & ~pd->total_apps & ~0x1;
 272                 u16 stop_apps = pd->total_apps & ~new_apps & ~0x1;
 273                 u16 resume_apps = new_apps & pd->paused_apps  & ~0x1;
 274                 spin_unlock_bh(&g_polling_lock);
 275                 oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
 276                 oz_timer_delete(pd, OZ_TIMER_STOP);
 277                 oz_trace("new_apps=0x%x total_apps=0x%x paused_apps=0x%x\n",
 278                         new_apps, pd->total_apps, pd->paused_apps);
 279                 if (start_apps) {
 280                         if (oz_services_start(pd, start_apps, 0))
 281                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 282                 }
 283                 if (resume_apps)
 284                         if (oz_services_start(pd, resume_apps, 1))
 285                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 286                 if (stop_apps)
 287                         oz_services_stop(pd, stop_apps, 0);
 288                 oz_pd_request_heartbeat(pd);
 289         } else {
 290                 spin_unlock_bh(&g_polling_lock);
 291         }
 292         oz_send_conn_rsp(pd, rsp_status);
 293         if (rsp_status != OZ_STATUS_SUCCESS) {
 294                 if (stop_needed)
 295                         oz_pd_stop(pd);
 296                 oz_pd_put(pd);
 297                 pd = NULL;
 298         }
 299         if (old_net_dev)
 300                 dev_put(old_net_dev);
 301         if (free_pd)
 302                 oz_pd_destroy(free_pd);
 303         return pd;
 304 }
 305 /*------------------------------------------------------------------------------
 306  * Context: softirq-serialized
 307  */
 308 static void oz_add_farewell(struct oz_pd *pd, u8 ep_num, u8 index,
 309                         const u8 *report, u8 len)
 310 {
 311         struct oz_farewell *f;
 312         struct oz_farewell *f2;
 313         int found = 0;
 314         f = kmalloc(sizeof(struct oz_farewell) + len - 1, GFP_ATOMIC);
 315         if (!f)
 316                 return;
 317         f->ep_num = ep_num;
 318         f->index = index;
 319         memcpy(f->report, report, len);
 320         oz_trace("RX: Adding farewell report\n");
 321         spin_lock(&g_polling_lock);
 322         list_for_each_entry(f2, &pd->farewell_list, link) {
 323                 if ((f2->ep_num == ep_num) && (f2->index == index)) {
 324                         found = 1;
 325                         list_del(&f2->link);
 326                         break;
 327                 }
 328         }
 329         list_add_tail(&f->link, &pd->farewell_list);
 330         spin_unlock(&g_polling_lock);
 331         if (found)
 332                 kfree(f2);
 333 }
 334 /*------------------------------------------------------------------------------
 335  * Context: softirq-serialized
 336  */
 337 static void oz_rx_frame(struct sk_buff *skb)
 338 {
 339         u8 *mac_hdr;
 340         u8 *src_addr;
 341         struct oz_elt *elt;
 342         int length;
 343         struct oz_pd *pd = NULL;
 344         struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb);
 345         int dup = 0;
 346         u32 pkt_num;
 347
 348         oz_event_log(OZ_EVT_RX_PROCESS, 0,
 349                 (((u16)oz_hdr->control)<<8)|oz_hdr->last_pkt_num,
 350                 NULL, oz_hdr->pkt_num);
 351         oz_trace2(OZ_TRACE_RX_FRAMES,
 352                 "RX frame PN=0x%x LPN=0x%x control=0x%x\n",
 353                 oz_hdr->pkt_num, oz_hdr->last_pkt_num, oz_hdr->control);
 354         mac_hdr = skb_mac_header(skb);
 355         src_addr = &mac_hdr[ETH_ALEN] ;
 356         length = skb->len;
 357
 358         /* Check the version field */
 359         if (oz_get_prot_ver(oz_hdr->control) != OZ_PROTOCOL_VERSION) {
 360                 oz_trace("Incorrect protocol version: %d\n",
 361                         oz_get_prot_ver(oz_hdr->control));
 362                 goto done;
 363         }
 364
 365         pkt_num = le32_to_cpu(get_unaligned(&oz_hdr->pkt_num));
 366
 367         pd = oz_pd_find(src_addr);
 368         if (pd) {
 369                 pd->last_rx_time_j = jiffies;
 370                 oz_timer_add(pd, OZ_TIMER_TOUT,
 371                         pd->last_rx_time_j + pd->presleep_j, 1);
 372                 if (pkt_num != pd->last_rx_pkt_num) {
 373                         pd->last_rx_pkt_num = pkt_num;
 374                 } else {
 375                         dup = 1;
 376                         oz_trace("Duplicate frame\n");
 377                 }
 378         }
 379
 380         if (pd && !dup && ((pd->mode & OZ_MODE_MASK) == OZ_MODE_TRIGGERED)) {
 381                 oz_trace2(OZ_TRACE_RX_FRAMES, "Received TRIGGER Frame\n");
 382                 pd->last_sent_frame = &pd->tx_queue;
 383                 if (oz_hdr->control & OZ_F_ACK) {
 384                         /* Retire completed frames */
 385                         oz_retire_tx_frames(pd, oz_hdr->last_pkt_num);
 386                 }
 387                 if ((oz_hdr->control & OZ_F_ACK_REQUESTED) &&
 388                                 (pd->state == OZ_PD_S_CONNECTED)) {
 389                         int backlog = pd->nb_queued_frames;
 390                         pd->trigger_pkt_num = pkt_num;
 391                         /* Send queued frames */
 392                         oz_send_queued_frames(pd, backlog);
 393                 }
 394         }
 395
 396         length -= sizeof(struct oz_hdr);
 397         elt = (struct oz_elt *)((u8 *)oz_hdr + sizeof(struct oz_hdr));
 398
 399         while (length >= sizeof(struct oz_elt)) {
 400                 length -= sizeof(struct oz_elt) + elt->length;
 401                 if (length < 0)
 402                         break;
 403                 switch (elt->type) {
 404                 case OZ_ELT_CONNECT_REQ:
 405                         oz_event_log(OZ_EVT_CONNECT_REQ, 0, 0, NULL, 0);
 406                         oz_trace("RX: OZ_ELT_CONNECT_REQ\n");
 407                         pd = oz_connect_req(pd, elt, src_addr, skb->dev);
 408                         break;
 409                 case OZ_ELT_DISCONNECT:
 410                         oz_trace("RX: OZ_ELT_DISCONNECT\n");
 411                         if (pd)
 412                                 oz_pd_sleep(pd);
 413                         break;
 414                 case OZ_ELT_UPDATE_PARAM_REQ: {
 415                                 struct oz_elt_update_param *body =
 416                                         (struct oz_elt_update_param *)(elt + 1);
 417                                 oz_trace("RX: OZ_ELT_UPDATE_PARAM_REQ\n");
 418                                 if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 419                                         spin_lock(&g_polling_lock);
 420                                         pd_set_keepalive(pd, body->keepalive);
 421                                         pd_set_presleep(pd, body->presleep);
 422                                         spin_unlock(&g_polling_lock);
 423                                 }
 424                         }
 425                         break;
 426                 case OZ_ELT_FAREWELL_REQ: {
 427                                 struct oz_elt_farewell *body =
 428                                         (struct oz_elt_farewell *)(elt + 1);
 429                                 oz_trace("RX: OZ_ELT_FAREWELL_REQ\n");
 430                                 oz_add_farewell(pd, body->ep_num,
 431                                         body->index, body->report,
 432                                         elt->length + 1 - sizeof(*body));
 433                         }
 434                         break;
 435                 case OZ_ELT_APP_DATA:
 436                         if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 437                                 struct oz_app_hdr *app_hdr =
 438                                         (struct oz_app_hdr *)(elt+1);
 439                                 if (dup)
 440                                         break;
 441                                 oz_handle_app_elt(pd, app_hdr->app_id, elt);
 442                         }
 443                         break;
 444                 default:
 445                         oz_trace("RX: Unknown elt %02x\n", elt->type);
 446                 }
 447                 elt = oz_next_elt(elt);
 448         }
 449 done:
 450         if (pd)
 451                 oz_pd_put(pd);
 452         consume_skb(skb);
 453 }
 454 /*------------------------------------------------------------------------------
 455  * Context: process
 456  */
 457 void oz_protocol_term(void)
 458 {
 459         struct list_head *chain;
 460         del_timer_sync(&g_timer);
 461         /* Walk the list of bindings and remove each one.
 462          */
 463         spin_lock_bh(&g_binding_lock);
 464         while (g_binding) {
 465                 struct oz_binding *b = g_binding;
 466                 g_binding = b->next;
 467                 spin_unlock_bh(&g_binding_lock);
 468                 dev_remove_pack(&b->ptype);
 469                 if (b->ptype.dev)
 470                         dev_put(b->ptype.dev);
 471                 kfree(b);
 472                 spin_lock_bh(&g_binding_lock);
 473         }
 474         spin_unlock_bh(&g_binding_lock);
 475         /* Walk the list of PDs and stop each one. This causes the PD to be
 476          * removed from the list so we can just pull each one from the head
 477          * of the list.
 478          */
 479         spin_lock_bh(&g_polling_lock);
 480         while (!list_empty(&g_pd_list)) {
 481                 struct oz_pd *pd =
 482                         list_first_entry(&g_pd_list, struct oz_pd, link);
 483                 oz_pd_get(pd);
 484                 spin_unlock_bh(&g_polling_lock);
 485                 oz_pd_stop(pd);
 486                 oz_pd_put(pd);
 487                 spin_lock_bh(&g_polling_lock);
 488         }
 489         chain = g_timer_pool;
 490         g_timer_pool = NULL;
 491         spin_unlock_bh(&g_polling_lock);
 492         while (chain) {
 493                 struct oz_timer *t = container_of(chain, struct oz_timer, link);
 494                 chain = chain->next;
 495                 kfree(t);
 496         }
 497         oz_trace("Protocol stopped\n");
 498 }
 499 /*------------------------------------------------------------------------------
 500  * Context: softirq
 501  */
 502 static void oz_pd_handle_timer(struct oz_pd *pd, int type)
 503 {
 504         switch (type) {
 505         case OZ_TIMER_TOUT:
 506                 oz_pd_sleep(pd);
 507                 break;
 508         case OZ_TIMER_STOP:
 509                 oz_pd_stop(pd);
 510                 break;
 511         case OZ_TIMER_HEARTBEAT: {
 512                         u16 apps = 0;
 513                         spin_lock_bh(&g_polling_lock);
 514                         pd->heartbeat_requested = 0;
 515                         if (pd->state & OZ_PD_S_CONNECTED)
 516                                 apps = pd->total_apps;
 517                         spin_unlock_bh(&g_polling_lock);
 518                         if (apps)
 519                                 oz_pd_heartbeat(pd, apps);
 520                 }
 521                 break;
 522         }
 523 }
 524 /*------------------------------------------------------------------------------
 525  * Context: softirq
 526  */
 527 static void oz_protocol_timer(unsigned long arg)
 528 {
 529         struct oz_timer *t;
 530         struct oz_timer *t2;
 531         struct oz_pd *pd;
 532         spin_lock_bh(&g_polling_lock);
 533         if (!g_cur_timer) {
 534                 /* This happens if we remove the current timer but can't stop
 535                  * the timer from firing. In this case just get out.
 536                  */
 537                 oz_event_log(OZ_EVT_TIMER, 0, 0, NULL, 0);
 538                 spin_unlock_bh(&g_polling_lock);
 539                 return;
 540         }
 541         g_timer_state = OZ_TIMER_IN_HANDLER;
 542         t = g_cur_timer;
 543         g_cur_timer = NULL;
 544         list_del(&t->link);
 545         spin_unlock_bh(&g_polling_lock);
 546         do {
 547                 pd = t->pd;
 548                 oz_event_log(OZ_EVT_TIMER, 0, t->type, NULL, 0);
 549                 oz_pd_handle_timer(pd, t->type);
 550                 spin_lock_bh(&g_polling_lock);
 551                 if (g_timer_pool_count < OZ_MAX_TIMER_POOL_SIZE) {
 552                         t->link.next = g_timer_pool;
 553                         g_timer_pool = &t->link;
 554                         g_timer_pool_count++;
 555                         t = NULL;
 556                 }
 557                 if (!list_empty(&g_timer_list)) {
 558                         t2 =  container_of(g_timer_list.next,
 559                                 struct oz_timer, link);
 560                         if (time_before_eq(t2->due_time, jiffies))
 561                                 list_del(&t2->link);
 562                         else
 563                                 t2 = NULL;
 564                 } else {
 565                         t2 = NULL;
 566                 }
 567                 spin_unlock_bh(&g_polling_lock);
 568                 oz_pd_put(pd);
 569                 kfree(t);
 570                 t = t2;
 571         } while (t);
 572         g_timer_state = OZ_TIMER_IDLE;
 573         oz_protocol_timer_start();
 574 }
 575 /*------------------------------------------------------------------------------
 576  * Context: softirq
 577  */
 578 static void oz_protocol_timer_start(void)
 579 {
 580         spin_lock_bh(&g_polling_lock);
 581         if (!list_empty(&g_timer_list)) {
 582                 g_cur_timer =
 583                         container_of(g_timer_list.next, struct oz_timer, link);
 584                 if (g_timer_state == OZ_TIMER_SET) {
 585                         oz_event_log(OZ_EVT_TIMER_CTRL, 3,
 586                                 (u16)g_cur_timer->type, NULL,
 587                                 (unsigned)g_cur_timer->due_time);
 588                         mod_timer(&g_timer, g_cur_timer->due_time);
 589                 } else {
 590                         oz_event_log(OZ_EVT_TIMER_CTRL, 4,
 591                                 (u16)g_cur_timer->type, NULL,
 592                                 (unsigned)g_cur_timer->due_time);
 593                         g_timer.expires = g_cur_timer->due_time;
 594                         g_timer.function = oz_protocol_timer;
 595                         g_timer.data = 0;
 596                         add_timer(&g_timer);
 597                 }
 598                 g_timer_state = OZ_TIMER_SET;
 599         } else {
 600                 oz_trace("No queued timers\n");
 601         }
 602         spin_unlock_bh(&g_polling_lock);
 603 }
 604 /*------------------------------------------------------------------------------
 605  * Context: softirq or process
 606  */
 607 void oz_timer_add(struct oz_pd *pd, int type, unsigned long due_time,
 608                 int remove)
 609 {
 610         struct list_head *e;
 611         struct oz_timer *t = NULL;
 612         int restart_needed = 0;
 613         oz_event_log(OZ_EVT_TIMER_CTRL, 1, (u16)type, NULL, (unsigned)due_time);
 614         spin_lock(&g_polling_lock);
 615         if (remove) {
 616                 list_for_each(e, &g_timer_list) {
 617                         t = container_of(e, struct oz_timer, link);
 618                         if ((t->pd == pd) && (t->type == type)) {
 619                                 if (g_cur_timer == t) {
 620                                         restart_needed = 1;
 621                                         g_cur_timer = NULL;
 622                                 }
 623                                 list_del(e);
 624                                 break;
 625                         }
 626                         t = NULL;
 627                 }
 628         }
 629         if (!t) {
 630                 if (g_timer_pool) {
 631                         t = container_of(g_timer_pool, struct oz_timer, link);
 632                         g_timer_pool = g_timer_pool->next;
 633                         g_timer_pool_count--;
 634                 } else {
 635                         t = kmalloc(sizeof(struct oz_timer), GFP_ATOMIC);
 636                 }
 637                 if (t) {
 638                         t->pd = pd;
 639                         t->type = type;
 640                         oz_pd_get(pd);
 641                 }
 642         }
 643         if (t) {
 644                 struct oz_timer *t2;
 645                 t->due_time = due_time;
 646                 list_for_each(e, &g_timer_list) {
 647                         t2 = container_of(e, struct oz_timer, link);
 648                         if (time_before(due_time, t2->due_time)) {
 649                                 if (t2 == g_cur_timer) {
 650                                         g_cur_timer = NULL;
 651                                         restart_needed = 1;
 652                                 }
 653                                 break;
 654                         }
 655                 }
 656                 list_add_tail(&t->link, e);
 657         }
 658         if (g_timer_state == OZ_TIMER_IDLE)
 659                 restart_needed = 1;
 660         else if (g_timer_state == OZ_TIMER_IN_HANDLER)
 661                 restart_needed = 0;
 662         spin_unlock(&g_polling_lock);
 663         if (restart_needed)
 664                 oz_protocol_timer_start();
 665 }
 666 /*------------------------------------------------------------------------------
 667  * Context: softirq or process
 668  */
 669 void oz_timer_delete(struct oz_pd *pd, int type)
 670 {
 671         struct list_head *chain = NULL;
 672         struct oz_timer *t;
 673         struct oz_timer *n;
 674         int restart_needed = 0;
 675         int release = 0;
 676         oz_event_log(OZ_EVT_TIMER_CTRL, 2, (u16)type, NULL, 0);
 677         spin_lock(&g_polling_lock);
 678         list_for_each_entry_safe(t, n, &g_timer_list, link) {
 679                 if ((t->pd == pd) && ((type == 0) || (t->type == type))) {
 680                         if (g_cur_timer == t) {
 681                                 restart_needed = 1;
 682                                 g_cur_timer = NULL;
 683                                 del_timer(&g_timer);
 684                         }
 685                         list_del(&t->link);
 686                         release++;
 687                         if (g_timer_pool_count < OZ_MAX_TIMER_POOL_SIZE) {
 688                                 t->link.next = g_timer_pool;
 689                                 g_timer_pool = &t->link;
 690                                 g_timer_pool_count++;
 691                         } else {
 692                                 t->link.next = chain;
 693                                 chain = &t->link;
 694                         }
 695                         if (type)
 696                                 break;
 697                 }
 698         }
 699         if (g_timer_state == OZ_TIMER_IN_HANDLER)
 700                 restart_needed = 0;
 701         else if (restart_needed)
 702                 g_timer_state = OZ_TIMER_IDLE;
 703         spin_unlock(&g_polling_lock);
 704         if (restart_needed)
 705                 oz_protocol_timer_start();
 706         while (release--)
 707                 oz_pd_put(pd);
 708         while (chain) {
 709                 t = container_of(chain, struct oz_timer, link);
 710                 chain = chain->next;
 711                 kfree(t);
 712         }
 713 }
 714 /*------------------------------------------------------------------------------
 715  * Context: softirq or process
 716  */
 717 void oz_pd_request_heartbeat(struct oz_pd *pd)
 718 {
 719         unsigned long now = jiffies;
 720         unsigned long t;
 721         spin_lock(&g_polling_lock);
 722         if (pd->heartbeat_requested) {
 723                 spin_unlock(&g_polling_lock);
 724                 return;
 725         }
 726         if (pd->pulse_period_j)
 727                 t = ((now / pd->pulse_period_j) + 1) * pd->pulse_period_j;
 728         else
 729                 t = now + 1;
 730         pd->heartbeat_requested = 1;
 731         spin_unlock(&g_polling_lock);
 732         oz_timer_add(pd, OZ_TIMER_HEARTBEAT, t, 0);
 733 }
 734 /*------------------------------------------------------------------------------
 735  * Context: softirq or process
 736  */
 737 struct oz_pd *oz_pd_find(const u8 *mac_addr)
 738 {
 739         struct oz_pd *pd;
 740         struct list_head *e;
 741         spin_lock_bh(&g_polling_lock);
 742         list_for_each(e, &g_pd_list) {
 743                 pd = container_of(e, struct oz_pd, link);
 744                 if (memcmp(pd->mac_addr, mac_addr, ETH_ALEN) == 0) {
 745                         atomic_inc(&pd->ref_count);
 746                         spin_unlock_bh(&g_polling_lock);
 747                         return pd;
 748                 }
 749         }
 750         spin_unlock_bh(&g_polling_lock);
 751         return NULL;
 752 }
 753 /*------------------------------------------------------------------------------
 754  * Context: process
 755  */
 756 void oz_app_enable(int app_id, int enable)
 757 {
 758         if (app_id <= OZ_APPID_MAX) {
 759                 spin_lock_bh(&g_polling_lock);
 760                 if (enable)
 761                         g_apps |= (1<<app_id);
 762                 else
 763                         g_apps &= ~(1<<app_id);
 764                 spin_unlock_bh(&g_polling_lock);
 765         }
 766 }
 767 /*------------------------------------------------------------------------------
 768  * Context: softirq
 769  */
 770 static int oz_pkt_recv(struct sk_buff *skb, struct net_device *dev,
 771                 struct packet_type *pt, struct net_device *orig_dev)
 772 {
 773         oz_event_log(OZ_EVT_RX_FRAME, 0, 0, NULL, 0);
 774         skb = skb_share_check(skb, GFP_ATOMIC);
 775         if (skb == NULL)
 776                 return 0;
 777         spin_lock_bh(&g_rx_queue.lock);
 778         if (g_processing_rx) {
 779                 /* We already hold the lock so use __ variant.
 780                  */
 781                 __skb_queue_head(&g_rx_queue, skb);
 782                 spin_unlock_bh(&g_rx_queue.lock);
 783         } else {
 784                 g_processing_rx = 1;
 785                 do {
 786
 787                         spin_unlock_bh(&g_rx_queue.lock);
 788                         oz_rx_frame(skb);
 789                         spin_lock_bh(&g_rx_queue.lock);
 790                         if (skb_queue_empty(&g_rx_queue)) {
 791                                 g_processing_rx = 0;
 792                                 spin_unlock_bh(&g_rx_queue.lock);
 793                                 break;
 794                         }
 795                         /* We already hold the lock so use __ variant.
 796                          */
 797                         skb = __skb_dequeue(&g_rx_queue);
 798                 } while (1);
 799         }
 800         return 0;
 801 }
 802 /*------------------------------------------------------------------------------
 803  * Context: process
 804  */
 805 void oz_binding_add(char *net_dev)
 806 {
 807         struct oz_binding *binding;
 808
 809         binding = kmalloc(sizeof(struct oz_binding), GFP_KERNEL);
 810         if (binding) {
 811                 binding->ptype.type = __constant_htons(OZ_ETHERTYPE);
 812                 binding->ptype.func = oz_pkt_recv;
 813                 memcpy(binding->name, net_dev, OZ_MAX_BINDING_LEN);
 814                 if (net_dev && *net_dev) {
 815                         oz_trace("Adding binding: %s\n", net_dev);
 816                         binding->ptype.dev =
 817                                 dev_get_by_name(&init_net, net_dev);
 818                         if (binding->ptype.dev == NULL) {
 819                                 oz_trace("Netdev %s not found\n", net_dev);
 820                                 kfree(binding);
 821                                 binding = NULL;
 822                         }
 823                 } else {
 824                         oz_trace("Binding to all netcards\n");
 825                         binding->ptype.dev = NULL;
 826                 }
 827                 if (binding) {
 828                         dev_add_pack(&binding->ptype);
 829                         spin_lock_bh(&g_binding_lock);
 830                         binding->next = g_binding;
 831                         g_binding = binding;
 832                         spin_unlock_bh(&g_binding_lock);
 833                 }
 834         }
 835 }
 836 /*------------------------------------------------------------------------------
 837  * Context: process
 838  */
 839 static int compare_binding_name(char *s1, char *s2)
 840 {
 841         int i;
 842         for (i = 0; i < OZ_MAX_BINDING_LEN; i++) {
 843                 if (*s1 != *s2)
 844                         return 0;
 845                 if (!*s1++)
 846                         return 1;
 847                 s2++;
 848         }
 849         return 1;
 850 }
 851 /*------------------------------------------------------------------------------
 852  * Context: process
 853  */
 854 static void pd_stop_all_for_device(struct net_device *net_dev)
 855 {
 856         struct list_head h;
 857         struct oz_pd *pd;
 858         struct oz_pd *n;
 859         INIT_LIST_HEAD(&h);
 860         spin_lock_bh(&g_polling_lock);
 861         list_for_each_entry_safe(pd, n, &g_pd_list, link) {
 862                 if (pd->net_dev == net_dev) {
 863                         list_move(&pd->link, &h);
 864                         oz_pd_get(pd);
 865                 }
 866         }
 867         spin_unlock_bh(&g_polling_lock);
 868         while (!list_empty(&h)) {
 869                 pd = list_first_entry(&h, struct oz_pd, link);
 870                 oz_pd_stop(pd);
 871                 oz_pd_put(pd);
 872         }
 873 }
 874 /*------------------------------------------------------------------------------
 875  * Context: process
 876  */
 877 void oz_binding_remove(char *net_dev)
 878 {
 879         struct oz_binding *binding;
 880         struct oz_binding **link;
 881         oz_trace("Removing binding: %s\n", net_dev);
 882         spin_lock_bh(&g_binding_lock);
 883         binding = g_binding;
 884         link = &g_binding;
 885         while (binding) {
 886                 if (compare_binding_name(binding->name, net_dev)) {
 887                         oz_trace("Binding '%s' found\n", net_dev);
 888                         *link = binding->next;
 889                         break;
 890                 } else {
 891                         link = &binding;
 892                         binding = binding->next;
 893                 }
 894         }
 895         spin_unlock_bh(&g_binding_lock);
 896         if (binding) {
 897                 dev_remove_pack(&binding->ptype);
 898                 if (binding->ptype.dev) {
 899                         dev_put(binding->ptype.dev);
 900                         pd_stop_all_for_device(binding->ptype.dev);
 901                 }
 902                 kfree(binding);
 903         }
 904 }
 905 /*------------------------------------------------------------------------------
 906  * Context: process
 907  */
 908 static char *oz_get_next_device_name(char *s, char *dname, int max_size)
 909 {
 910         while (*s == ',')
 911                 s++;
 912         while (*s && (*s != ',') && max_size > 1) {
 913                 *dname++ = *s++;
 914                 max_size--;
 915         }
 916         *dname = 0;
 917         return s;
 918 }
 919 /*------------------------------------------------------------------------------
 920  * Context: process
 921  */
 922 int oz_protocol_init(char *devs)
 923 {
 924         skb_queue_head_init(&g_rx_queue);
 925         if (devs && (devs[0] == '*')) {
 926                 oz_binding_add(NULL);
 927         } else {
 928                 char d[32];
 929                 while (*devs) {
 930                         devs = oz_get_next_device_name(devs, d, sizeof(d));
 931                         if (d[0])
 932                                 oz_binding_add(d);
 933                 }
 934         }
 935         init_timer(&g_timer);
 936         return 0;
 937 }
 938 /*------------------------------------------------------------------------------
 939  * Context: process
 940  */
 941 int oz_get_pd_list(struct oz_mac_addr *addr, int max_count)
 942 {
 943         struct oz_pd *pd;
 944         struct list_head *e;
 945         int count = 0;
 946         spin_lock_bh(&g_polling_lock);
 947         list_for_each(e, &g_pd_list) {
 948                 if (count >= max_count)
 949                         break;
 950                 pd = container_of(e, struct oz_pd, link);
 951                 memcpy(&addr[count++], pd->mac_addr, ETH_ALEN);
 952         }
 953         spin_unlock_bh(&g_polling_lock);
 954         return count;
 955 }
 956 /*------------------------------------------------------------------------------
 957 */
 958 void oz_polling_lock_bh(void)
 959 {
 960         spin_lock_bh(&g_polling_lock);
 961 }
 962 /*------------------------------------------------------------------------------
 963 */
 964 void oz_polling_unlock_bh(void)
 965 {
 966         spin_unlock_bh(&g_polling_lock);
 967 }