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