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 #define OZ_MAX_TIMER_POOL_SIZE  16
  34
  35 /*------------------------------------------------------------------------------
  36  */
  37 struct oz_binding {
  38         struct packet_type ptype;
  39         char name[OZ_MAX_BINDING_LEN];
  40         struct list_head link;
  41 };
  42
  43 /*------------------------------------------------------------------------------
  44  * Static external variables.
  45  */
  46 static DEFINE_SPINLOCK(g_polling_lock);
  47 static LIST_HEAD(g_pd_list);
  48 static LIST_HEAD(g_binding);
  49 static DEFINE_SPINLOCK(g_binding_lock);
  50 static struct sk_buff_head g_rx_queue;
  51 static u8 g_session_id;
  52 static u16 g_apps = 0x1;
  53 static int g_processing_rx;
  54 /*------------------------------------------------------------------------------
  55  * Context: softirq-serialized
  56  */
  57 static u8 oz_get_new_session_id(u8 exclude)
  58 {
  59         if (++g_session_id == 0)
  60                 g_session_id = 1;
  61         if (g_session_id == exclude) {
  62                 if (++g_session_id == 0)
  63                         g_session_id = 1;
  64         }
  65         return g_session_id;
  66 }
  67 /*------------------------------------------------------------------------------
  68  * Context: softirq-serialized
  69  */
  70 static void oz_send_conn_rsp(struct oz_pd *pd, u8 status)
  71 {
  72         struct sk_buff *skb;
  73         struct net_device *dev = pd->net_dev;
  74         struct oz_hdr *oz_hdr;
  75         struct oz_elt *elt;
  76         struct oz_elt_connect_rsp *body;
  77
  78         int sz = sizeof(struct oz_hdr) + sizeof(struct oz_elt) +
  79                         sizeof(struct oz_elt_connect_rsp);
  80         skb = alloc_skb(sz + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC);
  81         if (skb == NULL)
  82                 return;
  83         skb_reserve(skb, LL_RESERVED_SPACE(dev));
  84         skb_reset_network_header(skb);
  85         oz_hdr = (struct oz_hdr *)skb_put(skb, sz);
  86         elt = (struct oz_elt *)(oz_hdr+1);
  87         body = (struct oz_elt_connect_rsp *)(elt+1);
  88         skb->dev = dev;
  89         skb->protocol = htons(OZ_ETHERTYPE);
  90         /* Fill in device header */
  91         if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr,
  92                         dev->dev_addr, skb->len) < 0) {
  93                 kfree_skb(skb);
  94                 return;
  95         }
  96         oz_hdr->control = (OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT);
  97         oz_hdr->last_pkt_num = 0;
  98         put_unaligned(0, &oz_hdr->pkt_num);
  99         elt->type = OZ_ELT_CONNECT_RSP;
 100         elt->length = sizeof(struct oz_elt_connect_rsp);
 101         memset(body, 0, sizeof(struct oz_elt_connect_rsp));
 102         body->status = status;
 103         if (status == 0) {
 104                 body->mode = pd->mode;
 105                 body->session_id = pd->session_id;
 106                 put_unaligned(cpu_to_le16(pd->total_apps), &body->apps);
 107         }
 108         oz_dbg(ON, "TX: OZ_ELT_CONNECT_RSP %d", status);
 109         dev_queue_xmit(skb);
 110         return;
 111 }
 112 /*------------------------------------------------------------------------------
 113  * Context: softirq-serialized
 114  */
 115 static void pd_set_keepalive(struct oz_pd *pd, u8 kalive)
 116 {
 117         unsigned long keep_alive = kalive & OZ_KALIVE_VALUE_MASK;
 118
 119         switch (kalive & OZ_KALIVE_TYPE_MASK) {
 120         case OZ_KALIVE_SPECIAL:
 121                 pd->keep_alive = keep_alive * 1000*60*60*24*20;
 122                 break;
 123         case OZ_KALIVE_SECS:
 124                 pd->keep_alive = keep_alive*1000;
 125                 break;
 126         case OZ_KALIVE_MINS:
 127                 pd->keep_alive = keep_alive*1000*60;
 128                 break;
 129         case OZ_KALIVE_HOURS:
 130                 pd->keep_alive = keep_alive*1000*60*60;
 131                 break;
 132         default:
 133                 pd->keep_alive = 0;
 134         }
 135         oz_dbg(ON, "Keepalive = %lu mSec\n", pd->keep_alive);
 136 }
 137 /*------------------------------------------------------------------------------
 138  * Context: softirq-serialized
 139  */
 140 static void pd_set_presleep(struct oz_pd *pd, u8 presleep, u8 start_timer)
 141 {
 142         if (presleep)
 143                 pd->presleep = presleep*100;
 144         else
 145                 pd->presleep = OZ_PRESLEEP_TOUT;
 146         if (start_timer) {
 147                 spin_unlock(&g_polling_lock);
 148                 oz_timer_add(pd, OZ_TIMER_TOUT, pd->presleep);
 149                 spin_lock(&g_polling_lock);
 150         }
 151         oz_dbg(ON, "Presleep time = %lu mSec\n", pd->presleep);
 152 }
 153 /*------------------------------------------------------------------------------
 154  * Context: softirq-serialized
 155  */
 156 static struct oz_pd *oz_connect_req(struct oz_pd *cur_pd, struct oz_elt *elt,
 157                         const u8 *pd_addr, struct net_device *net_dev)
 158 {
 159         struct oz_pd *pd;
 160         struct oz_elt_connect_req *body =
 161                         (struct oz_elt_connect_req *)(elt+1);
 162         u8 rsp_status = OZ_STATUS_SUCCESS;
 163         u8 stop_needed = 0;
 164         u16 new_apps = g_apps;
 165         struct net_device *old_net_dev = NULL;
 166         struct oz_pd *free_pd = NULL;
 167
 168         if (cur_pd) {
 169                 pd = cur_pd;
 170                 spin_lock_bh(&g_polling_lock);
 171         } else {
 172                 struct oz_pd *pd2 = NULL;
 173                 struct list_head *e;
 174                 pd = oz_pd_alloc(pd_addr);
 175                 if (pd == NULL)
 176                         return NULL;
 177                 getnstimeofday(&pd->last_rx_timestamp);
 178                 spin_lock_bh(&g_polling_lock);
 179                 list_for_each(e, &g_pd_list) {
 180                         pd2 = container_of(e, struct oz_pd, link);
 181                         if (memcmp(pd2->mac_addr, pd_addr, ETH_ALEN) == 0) {
 182                                 free_pd = pd;
 183                                 pd = pd2;
 184                                 break;
 185                         }
 186                 }
 187                 if (pd != pd2)
 188                         list_add_tail(&pd->link, &g_pd_list);
 189         }
 190         if (pd == NULL) {
 191                 spin_unlock_bh(&g_polling_lock);
 192                 return NULL;
 193         }
 194         if (pd->net_dev != net_dev) {
 195                 old_net_dev = pd->net_dev;
 196                 dev_hold(net_dev);
 197                 pd->net_dev = net_dev;
 198         }
 199         oz_dbg(ON, "Host vendor: %d\n", body->host_vendor);
 200         pd->max_tx_size = OZ_MAX_TX_SIZE;
 201         pd->mode = body->mode;
 202         pd->pd_info = body->pd_info;
 203         if (pd->mode & OZ_F_ISOC_NO_ELTS) {
 204                 pd->ms_per_isoc = body->ms_per_isoc;
 205                 if (!pd->ms_per_isoc)
 206                         pd->ms_per_isoc = 4;
 207
 208                 switch (body->ms_isoc_latency & OZ_LATENCY_MASK) {
 209                 case OZ_ONE_MS_LATENCY:
 210                         pd->isoc_latency = (body->ms_isoc_latency &
 211                                         ~OZ_LATENCY_MASK) / pd->ms_per_isoc;
 212                         break;
 213                 case OZ_TEN_MS_LATENCY:
 214                         pd->isoc_latency = ((body->ms_isoc_latency &
 215                                 ~OZ_LATENCY_MASK) * 10) / pd->ms_per_isoc;
 216                         break;
 217                 default:
 218                         pd->isoc_latency = OZ_MAX_TX_QUEUE_ISOC;
 219                 }
 220         }
 221         if (body->max_len_div16)
 222                 pd->max_tx_size = ((u16)body->max_len_div16)<<4;
 223         oz_dbg(ON, "Max frame:%u Ms per isoc:%u\n",
 224                pd->max_tx_size, pd->ms_per_isoc);
 225         pd->max_stream_buffering = 3*1024;
 226         pd->pulse_period = OZ_QUANTUM;
 227         pd_set_presleep(pd, body->presleep, 0);
 228         pd_set_keepalive(pd, body->keep_alive);
 229
 230         new_apps &= le16_to_cpu(get_unaligned(&body->apps));
 231         if ((new_apps & 0x1) && (body->session_id)) {
 232                 if (pd->session_id) {
 233                         if (pd->session_id != body->session_id) {
 234                                 rsp_status = OZ_STATUS_SESSION_MISMATCH;
 235                                 goto done;
 236                         }
 237                 } else {
 238                         new_apps &= ~0x1;  /* Resume not permitted */
 239                         pd->session_id =
 240                                 oz_get_new_session_id(body->session_id);
 241                 }
 242         } else {
 243                 if (pd->session_id && !body->session_id) {
 244                         rsp_status = OZ_STATUS_SESSION_TEARDOWN;
 245                         stop_needed = 1;
 246                 } else {
 247                         new_apps &= ~0x1;  /* Resume not permitted */
 248                         pd->session_id =
 249                                 oz_get_new_session_id(body->session_id);
 250                 }
 251         }
 252 done:
 253         if (rsp_status == OZ_STATUS_SUCCESS) {
 254                 u16 start_apps = new_apps & ~pd->total_apps & ~0x1;
 255                 u16 stop_apps = pd->total_apps & ~new_apps & ~0x1;
 256                 u16 resume_apps = new_apps & pd->paused_apps  & ~0x1;
 257                 spin_unlock_bh(&g_polling_lock);
 258                 oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
 259                 oz_dbg(ON, "new_apps=0x%x total_apps=0x%x paused_apps=0x%x\n",
 260                        new_apps, pd->total_apps, pd->paused_apps);
 261                 if (start_apps) {
 262                         if (oz_services_start(pd, start_apps, 0))
 263                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 264                 }
 265                 if (resume_apps)
 266                         if (oz_services_start(pd, resume_apps, 1))
 267                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 268                 if (stop_apps)
 269                         oz_services_stop(pd, stop_apps, 0);
 270                 oz_pd_request_heartbeat(pd);
 271         } else {
 272                 spin_unlock_bh(&g_polling_lock);
 273         }
 274         oz_send_conn_rsp(pd, rsp_status);
 275         if (rsp_status != OZ_STATUS_SUCCESS) {
 276                 if (stop_needed)
 277                         oz_pd_stop(pd);
 278                 oz_pd_put(pd);
 279                 pd = NULL;
 280         }
 281         if (old_net_dev)
 282                 dev_put(old_net_dev);
 283         if (free_pd)
 284                 oz_pd_destroy(free_pd);
 285         return pd;
 286 }
 287 /*------------------------------------------------------------------------------
 288  * Context: softirq-serialized
 289  */
 290 static void oz_add_farewell(struct oz_pd *pd, u8 ep_num, u8 index,
 291                         const u8 *report, u8 len)
 292 {
 293         struct oz_farewell *f;
 294         struct oz_farewell *f2;
 295         int found = 0;
 296
 297         f = kmalloc(sizeof(struct oz_farewell) + len, GFP_ATOMIC);
 298         if (!f)
 299                 return;
 300         f->ep_num = ep_num;
 301         f->index = index;
 302         f->len = len;
 303         memcpy(f->report, report, len);
 304         oz_dbg(ON, "RX: Adding farewell report\n");
 305         spin_lock(&g_polling_lock);
 306         list_for_each_entry(f2, &pd->farewell_list, link) {
 307                 if ((f2->ep_num == ep_num) && (f2->index == index)) {
 308                         found = 1;
 309                         list_del(&f2->link);
 310                         break;
 311                 }
 312         }
 313         list_add_tail(&f->link, &pd->farewell_list);
 314         spin_unlock(&g_polling_lock);
 315         if (found)
 316                 kfree(f2);
 317 }
 318 /*------------------------------------------------------------------------------
 319  * Context: softirq-serialized
 320  */
 321 static void oz_rx_frame(struct sk_buff *skb)
 322 {
 323         u8 *mac_hdr;
 324         u8 *src_addr;
 325         struct oz_elt *elt;
 326         int length;
 327         struct oz_pd *pd = NULL;
 328         struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb);
 329         struct timespec current_time;
 330         int dup = 0;
 331         u32 pkt_num;
 332
 333         oz_dbg(RX_FRAMES, "RX frame PN=0x%x LPN=0x%x control=0x%x\n",
 334                oz_hdr->pkt_num, oz_hdr->last_pkt_num, oz_hdr->control);
 335         mac_hdr = skb_mac_header(skb);
 336         src_addr = &mac_hdr[ETH_ALEN] ;
 337         length = skb->len;
 338
 339         /* Check the version field */
 340         if (oz_get_prot_ver(oz_hdr->control) != OZ_PROTOCOL_VERSION) {
 341                 oz_dbg(ON, "Incorrect protocol version: %d\n",
 342                        oz_get_prot_ver(oz_hdr->control));
 343                 goto done;
 344         }
 345
 346         pkt_num = le32_to_cpu(get_unaligned(&oz_hdr->pkt_num));
 347
 348         pd = oz_pd_find(src_addr);
 349         if (pd) {
 350                 if (!(pd->state & OZ_PD_S_CONNECTED))
 351                         oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
 352                 getnstimeofday(&current_time);
 353                 if ((current_time.tv_sec != pd->last_rx_timestamp.tv_sec) ||
 354                         (pd->presleep < MSEC_PER_SEC))  {
 355                         oz_timer_add(pd, OZ_TIMER_TOUT, pd->presleep);
 356                         pd->last_rx_timestamp = current_time;
 357                 }
 358                 if (pkt_num != pd->last_rx_pkt_num) {
 359                         pd->last_rx_pkt_num = pkt_num;
 360                 } else {
 361                         dup = 1;
 362                         oz_dbg(ON, "Duplicate frame\n");
 363                 }
 364         }
 365
 366         if (pd && !dup && ((pd->mode & OZ_MODE_MASK) == OZ_MODE_TRIGGERED)) {
 367                 oz_dbg(RX_FRAMES, "Received TRIGGER Frame\n");
 368                 pd->last_sent_frame = &pd->tx_queue;
 369                 if (oz_hdr->control & OZ_F_ACK) {
 370                         /* Retire completed frames */
 371                         oz_retire_tx_frames(pd, oz_hdr->last_pkt_num);
 372                 }
 373                 if ((oz_hdr->control & OZ_F_ACK_REQUESTED) &&
 374                                 (pd->state == OZ_PD_S_CONNECTED)) {
 375                         int backlog = pd->nb_queued_frames;
 376                         pd->trigger_pkt_num = pkt_num;
 377                         /* Send queued frames */
 378                         oz_send_queued_frames(pd, backlog);
 379                 }
 380         }
 381
 382         length -= sizeof(struct oz_hdr);
 383         elt = (struct oz_elt *)((u8 *)oz_hdr + sizeof(struct oz_hdr));
 384
 385         while (length >= sizeof(struct oz_elt)) {
 386                 length -= sizeof(struct oz_elt) + elt->length;
 387                 if (length < 0)
 388                         break;
 389                 switch (elt->type) {
 390                 case OZ_ELT_CONNECT_REQ:
 391                         oz_dbg(ON, "RX: OZ_ELT_CONNECT_REQ\n");
 392                         pd = oz_connect_req(pd, elt, src_addr, skb->dev);
 393                         break;
 394                 case OZ_ELT_DISCONNECT:
 395                         oz_dbg(ON, "RX: OZ_ELT_DISCONNECT\n");
 396                         if (pd)
 397                                 oz_pd_sleep(pd);
 398                         break;
 399                 case OZ_ELT_UPDATE_PARAM_REQ: {
 400                                 struct oz_elt_update_param *body =
 401                                         (struct oz_elt_update_param *)(elt + 1);
 402                                 oz_dbg(ON, "RX: OZ_ELT_UPDATE_PARAM_REQ\n");
 403                                 if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 404                                         spin_lock(&g_polling_lock);
 405                                         pd_set_keepalive(pd, body->keepalive);
 406                                         pd_set_presleep(pd, body->presleep, 1);
 407                                         spin_unlock(&g_polling_lock);
 408                                 }
 409                         }
 410                         break;
 411                 case OZ_ELT_FAREWELL_REQ: {
 412                                 struct oz_elt_farewell *body =
 413                                         (struct oz_elt_farewell *)(elt + 1);
 414                                 oz_dbg(ON, "RX: OZ_ELT_FAREWELL_REQ\n");
 415                                 oz_add_farewell(pd, body->ep_num,
 416                                         body->index, body->report,
 417                                         elt->length + 1 - sizeof(*body));
 418                         }
 419                         break;
 420                 case OZ_ELT_APP_DATA:
 421                         if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 422                                 struct oz_app_hdr *app_hdr =
 423                                         (struct oz_app_hdr *)(elt+1);
 424                                 if (dup)
 425                                         break;
 426                                 oz_handle_app_elt(pd, app_hdr->app_id, elt);
 427                         }
 428                         break;
 429                 default:
 430                         oz_dbg(ON, "RX: Unknown elt %02x\n", elt->type);
 431                 }
 432                 elt = oz_next_elt(elt);
 433         }
 434 done:
 435         if (pd)
 436                 oz_pd_put(pd);
 437         consume_skb(skb);
 438 }
 439 /*------------------------------------------------------------------------------
 440  * Context: process
 441  */
 442 void oz_protocol_term(void)
 443 {
 444         struct oz_binding *b, *t;
 445
 446         /* Walk the list of bindings and remove each one.
 447          */
 448         spin_lock_bh(&g_binding_lock);
 449         list_for_each_entry_safe(b, t, &g_binding, link) {
 450                 list_del(&b->link);
 451                 spin_unlock_bh(&g_binding_lock);
 452                 dev_remove_pack(&b->ptype);
 453                 if (b->ptype.dev)
 454                         dev_put(b->ptype.dev);
 455                 kfree(b);
 456                 spin_lock_bh(&g_binding_lock);
 457         }
 458         spin_unlock_bh(&g_binding_lock);
 459         /* Walk the list of PDs and stop each one. This causes the PD to be
 460          * removed from the list so we can just pull each one from the head
 461          * of the list.
 462          */
 463         spin_lock_bh(&g_polling_lock);
 464         while (!list_empty(&g_pd_list)) {
 465                 struct oz_pd *pd =
 466                         list_first_entry(&g_pd_list, struct oz_pd, link);
 467                 oz_pd_get(pd);
 468                 spin_unlock_bh(&g_polling_lock);
 469                 oz_pd_stop(pd);
 470                 oz_pd_put(pd);
 471                 spin_lock_bh(&g_polling_lock);
 472         }
 473         spin_unlock_bh(&g_polling_lock);
 474         oz_dbg(ON, "Protocol stopped\n");
 475 }
 476 /*------------------------------------------------------------------------------
 477  * Context: softirq
 478  */
 479 void oz_pd_heartbeat_handler(unsigned long data)
 480 {
 481         struct oz_pd *pd = (struct oz_pd *)data;
 482         u16 apps = 0;
 483
 484         spin_lock_bh(&g_polling_lock);
 485         if (pd->state & OZ_PD_S_CONNECTED)
 486                 apps = pd->total_apps;
 487         spin_unlock_bh(&g_polling_lock);
 488         if (apps)
 489                 oz_pd_heartbeat(pd, apps);
 490
 491 }
 492 /*------------------------------------------------------------------------------
 493  * Context: softirq
 494  */
 495 void oz_pd_timeout_handler(unsigned long data)
 496 {
 497         int type;
 498         struct oz_pd *pd = (struct oz_pd *)data;
 499
 500         spin_lock_bh(&g_polling_lock);
 501         type = pd->timeout_type;
 502         spin_unlock_bh(&g_polling_lock);
 503         switch (type) {
 504         case OZ_TIMER_TOUT:
 505                 oz_pd_sleep(pd);
 506                 break;
 507         case OZ_TIMER_STOP:
 508                 oz_pd_stop(pd);
 509                 break;
 510         }
 511 }
 512 /*------------------------------------------------------------------------------
 513  * Context: Interrupt
 514  */
 515 enum hrtimer_restart oz_pd_heartbeat_event(struct hrtimer *timer)
 516 {
 517         struct oz_pd *pd;
 518
 519         pd = container_of(timer, struct oz_pd, heartbeat);
 520         hrtimer_forward_now(timer, ktime_set(pd->pulse_period /
 521         MSEC_PER_SEC, (pd->pulse_period % MSEC_PER_SEC) * NSEC_PER_MSEC));
 522         tasklet_schedule(&pd->heartbeat_tasklet);
 523         return HRTIMER_RESTART;
 524 }
 525 /*------------------------------------------------------------------------------
 526  * Context: Interrupt
 527  */
 528 enum hrtimer_restart oz_pd_timeout_event(struct hrtimer *timer)
 529 {
 530         struct oz_pd *pd;
 531
 532         pd = container_of(timer, struct oz_pd, timeout);
 533         tasklet_schedule(&pd->timeout_tasklet);
 534         return HRTIMER_NORESTART;
 535 }
 536 /*------------------------------------------------------------------------------
 537  * Context: softirq or process
 538  */
 539 void oz_timer_add(struct oz_pd *pd, int type, unsigned long due_time)
 540 {
 541         spin_lock_bh(&g_polling_lock);
 542         switch (type) {
 543         case OZ_TIMER_TOUT:
 544         case OZ_TIMER_STOP:
 545                 if (hrtimer_active(&pd->timeout)) {
 546                         hrtimer_set_expires(&pd->timeout, ktime_set(due_time /
 547                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 548                                                         NSEC_PER_MSEC));
 549                         hrtimer_start_expires(&pd->timeout, HRTIMER_MODE_REL);
 550                 } else {
 551                         hrtimer_start(&pd->timeout, ktime_set(due_time /
 552                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 553                                         NSEC_PER_MSEC), HRTIMER_MODE_REL);
 554                 }
 555                 pd->timeout_type = type;
 556                 break;
 557         case OZ_TIMER_HEARTBEAT:
 558                 if (!hrtimer_active(&pd->heartbeat))
 559                         hrtimer_start(&pd->heartbeat, ktime_set(due_time /
 560                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 561                                         NSEC_PER_MSEC), HRTIMER_MODE_REL);
 562                 break;
 563         }
 564         spin_unlock_bh(&g_polling_lock);
 565 }
 566 /*------------------------------------------------------------------------------
 567  * Context: softirq or process
 568  */
 569 void oz_pd_request_heartbeat(struct oz_pd *pd)
 570 {
 571         oz_timer_add(pd, OZ_TIMER_HEARTBEAT, pd->pulse_period > 0 ?
 572                                         pd->pulse_period : OZ_QUANTUM);
 573 }
 574 /*------------------------------------------------------------------------------
 575  * Context: softirq or process
 576  */
 577 struct oz_pd *oz_pd_find(const u8 *mac_addr)
 578 {
 579         struct oz_pd *pd;
 580         struct list_head *e;
 581
 582         spin_lock_bh(&g_polling_lock);
 583         list_for_each(e, &g_pd_list) {
 584                 pd = container_of(e, struct oz_pd, link);
 585                 if (memcmp(pd->mac_addr, mac_addr, ETH_ALEN) == 0) {
 586                         atomic_inc(&pd->ref_count);
 587                         spin_unlock_bh(&g_polling_lock);
 588                         return pd;
 589                 }
 590         }
 591         spin_unlock_bh(&g_polling_lock);
 592         return NULL;
 593 }
 594 /*------------------------------------------------------------------------------
 595  * Context: process
 596  */
 597 void oz_app_enable(int app_id, int enable)
 598 {
 599         if (app_id <= OZ_APPID_MAX) {
 600                 spin_lock_bh(&g_polling_lock);
 601                 if (enable)
 602                         g_apps |= (1<<app_id);
 603                 else
 604                         g_apps &= ~(1<<app_id);
 605                 spin_unlock_bh(&g_polling_lock);
 606         }
 607 }
 608 /*------------------------------------------------------------------------------
 609  * Context: softirq
 610  */
 611 static int oz_pkt_recv(struct sk_buff *skb, struct net_device *dev,
 612                 struct packet_type *pt, struct net_device *orig_dev)
 613 {
 614         skb = skb_share_check(skb, GFP_ATOMIC);
 615         if (skb == NULL)
 616                 return 0;
 617         spin_lock_bh(&g_rx_queue.lock);
 618         if (g_processing_rx) {
 619                 /* We already hold the lock so use __ variant.
 620                  */
 621                 __skb_queue_head(&g_rx_queue, skb);
 622                 spin_unlock_bh(&g_rx_queue.lock);
 623         } else {
 624                 g_processing_rx = 1;
 625                 do {
 626
 627                         spin_unlock_bh(&g_rx_queue.lock);
 628                         oz_rx_frame(skb);
 629                         spin_lock_bh(&g_rx_queue.lock);
 630                         if (skb_queue_empty(&g_rx_queue)) {
 631                                 g_processing_rx = 0;
 632                                 spin_unlock_bh(&g_rx_queue.lock);
 633                                 break;
 634                         }
 635                         /* We already hold the lock so use __ variant.
 636                          */
 637                         skb = __skb_dequeue(&g_rx_queue);
 638                 } while (1);
 639         }
 640         return 0;
 641 }
 642 /*------------------------------------------------------------------------------
 643  * Context: process
 644  */
 645 void oz_binding_add(const char *net_dev)
 646 {
 647         struct oz_binding *binding;
 648
 649         binding = kmalloc(sizeof(struct oz_binding), GFP_KERNEL);
 650         if (binding) {
 651                 binding->ptype.type = __constant_htons(OZ_ETHERTYPE);
 652                 binding->ptype.func = oz_pkt_recv;
 653                 memcpy(binding->name, net_dev, OZ_MAX_BINDING_LEN);
 654                 if (net_dev && *net_dev) {
 655                         oz_dbg(ON, "Adding binding: %s\n", net_dev);
 656                         binding->ptype.dev =
 657                                 dev_get_by_name(&init_net, net_dev);
 658                         if (binding->ptype.dev == NULL) {
 659                                 oz_dbg(ON, "Netdev %s not found\n", net_dev);
 660                                 kfree(binding);
 661                                 binding = NULL;
 662                         }
 663                 } else {
 664                         oz_dbg(ON, "Binding to all netcards\n");
 665                         binding->ptype.dev = NULL;
 666                 }
 667                 if (binding) {
 668                         dev_add_pack(&binding->ptype);
 669                         spin_lock_bh(&g_binding_lock);
 670                         list_add_tail(&binding->link, &g_binding);
 671                         spin_unlock_bh(&g_binding_lock);
 672                 }
 673         }
 674 }
 675 /*------------------------------------------------------------------------------
 676  * Context: process
 677  */
 678 static void pd_stop_all_for_device(struct net_device *net_dev)
 679 {
 680         struct list_head h;
 681         struct oz_pd *pd;
 682         struct oz_pd *n;
 683
 684         INIT_LIST_HEAD(&h);
 685         spin_lock_bh(&g_polling_lock);
 686         list_for_each_entry_safe(pd, n, &g_pd_list, link) {
 687                 if (pd->net_dev == net_dev) {
 688                         list_move(&pd->link, &h);
 689                         oz_pd_get(pd);
 690                 }
 691         }
 692         spin_unlock_bh(&g_polling_lock);
 693         while (!list_empty(&h)) {
 694                 pd = list_first_entry(&h, struct oz_pd, link);
 695                 oz_pd_stop(pd);
 696                 oz_pd_put(pd);
 697         }
 698 }
 699 /*------------------------------------------------------------------------------
 700  * Context: process
 701  */
 702 void oz_binding_remove(const char *net_dev)
 703 {
 704         struct oz_binding *binding;
 705         int found = 0;
 706
 707         oz_dbg(ON, "Removing binding: %s\n", net_dev);
 708         spin_lock_bh(&g_binding_lock);
 709         list_for_each_entry(binding, &g_binding, link) {
 710                 if (strncmp(binding->name, net_dev, OZ_MAX_BINDING_LEN) == 0) {
 711                         oz_dbg(ON, "Binding '%s' found\n", net_dev);
 712                         found = 1;
 713                         break;
 714                 }
 715         }
 716         spin_unlock_bh(&g_binding_lock);
 717         if (found) {
 718                 dev_remove_pack(&binding->ptype);
 719                 if (binding->ptype.dev) {
 720                         dev_put(binding->ptype.dev);
 721                         pd_stop_all_for_device(binding->ptype.dev);
 722                 }
 723                 list_del(&binding->link);
 724                 kfree(binding);
 725         }
 726 }
 727 /*------------------------------------------------------------------------------
 728  * Context: process
 729  */
 730 static char *oz_get_next_device_name(char *s, char *dname, int max_size)
 731 {
 732         while (*s == ',')
 733                 s++;
 734         while (*s && (*s != ',') && max_size > 1) {
 735                 *dname++ = *s++;
 736                 max_size--;
 737         }
 738         *dname = 0;
 739         return s;
 740 }
 741 /*------------------------------------------------------------------------------
 742  * Context: process
 743  */
 744 int oz_protocol_init(char *devs)
 745 {
 746         skb_queue_head_init(&g_rx_queue);
 747         if (devs && (devs[0] == '*')) {
 748                 oz_binding_add(NULL);
 749         } else {
 750                 char d[32];
 751                 while (*devs) {
 752                         devs = oz_get_next_device_name(devs, d, sizeof(d));
 753                         if (d[0])
 754                                 oz_binding_add(d);
 755                 }
 756         }
 757         return 0;
 758 }
 759 /*------------------------------------------------------------------------------
 760  * Context: process
 761  */
 762 int oz_get_pd_list(struct oz_mac_addr *addr, int max_count)
 763 {
 764         struct oz_pd *pd;
 765         struct list_head *e;
 766         int count = 0;
 767
 768         spin_lock_bh(&g_polling_lock);
 769         list_for_each(e, &g_pd_list) {
 770                 if (count >= max_count)
 771                         break;
 772                 pd = container_of(e, struct oz_pd, link);
 773                 memcpy(&addr[count++], pd->mac_addr, ETH_ALEN);
 774         }
 775         spin_unlock_bh(&g_polling_lock);
 776         return count;
 777 }
 778 /*------------------------------------------------------------------------------
 779 */
 780 void oz_polling_lock_bh(void)
 781 {
 782         spin_lock_bh(&g_polling_lock);
 783 }
 784 /*------------------------------------------------------------------------------
 785 */
 786 void oz_polling_unlock_bh(void)
 787 {
 788         spin_unlock_bh(&g_polling_lock);
 789 }