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/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 "ozdbg.h"
  14 #include "ozprotocol.h"
  15 #include "ozeltbuf.h"
  16 #include "ozpd.h"
  17 #include "ozproto.h"
  18 #include "ozusbsvc.h"
  19
  20 #include "ozappif.h"
  21 #include <asm/unaligned.h>
  22 #include <linux/uaccess.h>
  23 #include <net/psnap.h>
  24
  25 #define OZ_CF_CONN_SUCCESS      1
  26 #define OZ_CF_CONN_FAILURE      2
  27
  28 #define OZ_DO_STOP              1
  29 #define OZ_DO_SLEEP             2
  30
  31 #define OZ_MAX_TIMER_POOL_SIZE  16
  32
  33 struct oz_binding {
  34         struct packet_type ptype;
  35         char name[OZ_MAX_BINDING_LEN];
  36         struct list_head link;
  37 };
  38
  39 /*
  40  * Static external variables.
  41  */
  42 static DEFINE_SPINLOCK(g_polling_lock);
  43 static LIST_HEAD(g_pd_list);
  44 static LIST_HEAD(g_binding);
  45 static DEFINE_SPINLOCK(g_binding_lock);
  46 static struct sk_buff_head g_rx_queue;
  47 static u8 g_session_id;
  48 static u16 g_apps = 0x1;
  49 static int g_processing_rx;
  50
  51 /*
  52  * Context: softirq-serialized
  53  */
  54 static u8 oz_get_new_session_id(u8 exclude)
  55 {
  56         if (++g_session_id == 0)
  57                 g_session_id = 1;
  58         if (g_session_id == exclude) {
  59                 if (++g_session_id == 0)
  60                         g_session_id = 1;
  61         }
  62         return g_session_id;
  63 }
  64
  65 /*
  66  * Context: softirq-serialized
  67  */
  68 static void oz_send_conn_rsp(struct oz_pd *pd, u8 status)
  69 {
  70         struct sk_buff *skb;
  71         struct net_device *dev = pd->net_dev;
  72         struct oz_hdr *oz_hdr;
  73         struct oz_elt *elt;
  74         struct oz_elt_connect_rsp *body;
  75
  76         int sz = sizeof(struct oz_hdr) + sizeof(struct oz_elt) +
  77                         sizeof(struct oz_elt_connect_rsp);
  78         skb = alloc_skb(sz + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC);
  79         if (skb == NULL)
  80                 return;
  81         skb_reserve(skb, LL_RESERVED_SPACE(dev));
  82         skb_reset_network_header(skb);
  83         oz_hdr = (struct oz_hdr *)skb_put(skb, sz);
  84         elt = (struct oz_elt *)(oz_hdr+1);
  85         body = (struct oz_elt_connect_rsp *)(elt+1);
  86         skb->dev = dev;
  87         skb->protocol = htons(OZ_ETHERTYPE);
  88         /* Fill in device header */
  89         if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr,
  90                         dev->dev_addr, skb->len) < 0) {
  91                 kfree_skb(skb);
  92                 return;
  93         }
  94         oz_hdr->control = (OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT);
  95         oz_hdr->last_pkt_num = 0;
  96         put_unaligned(0, &oz_hdr->pkt_num);
  97         elt->type = OZ_ELT_CONNECT_RSP;
  98         elt->length = sizeof(struct oz_elt_connect_rsp);
  99         memset(body, 0, sizeof(struct oz_elt_connect_rsp));
 100         body->status = status;
 101         if (status == 0) {
 102                 body->mode = pd->mode;
 103                 body->session_id = pd->session_id;
 104                 put_unaligned(cpu_to_le16(pd->total_apps), &body->apps);
 105         }
 106         oz_dbg(ON, "TX: OZ_ELT_CONNECT_RSP %d", status);
 107         dev_queue_xmit(skb);
 108         return;
 109 }
 110
 111 /*
 112  * Context: softirq-serialized
 113  */
 114 static void pd_set_keepalive(struct oz_pd *pd, u8 kalive)
 115 {
 116         unsigned long keep_alive = kalive & OZ_KALIVE_VALUE_MASK;
 117
 118         switch (kalive & OZ_KALIVE_TYPE_MASK) {
 119         case OZ_KALIVE_SPECIAL:
 120                 pd->keep_alive = keep_alive * 1000*60*60*24*20;
 121                 break;
 122         case OZ_KALIVE_SECS:
 123                 pd->keep_alive = keep_alive*1000;
 124                 break;
 125         case OZ_KALIVE_MINS:
 126                 pd->keep_alive = keep_alive*1000*60;
 127                 break;
 128         case OZ_KALIVE_HOURS:
 129                 pd->keep_alive = keep_alive*1000*60*60;
 130                 break;
 131         default:
 132                 pd->keep_alive = 0;
 133         }
 134         oz_dbg(ON, "Keepalive = %lu mSec\n", pd->keep_alive);
 135 }
 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 /*
 155  * Context: softirq-serialized
 156  */
 157 static struct oz_pd *oz_connect_req(struct oz_pd *cur_pd, struct oz_elt *elt,
 158                         const u8 *pd_addr, struct net_device *net_dev)
 159 {
 160         struct oz_pd *pd;
 161         struct oz_elt_connect_req *body =
 162                         (struct oz_elt_connect_req *)(elt+1);
 163         u8 rsp_status = OZ_STATUS_SUCCESS;
 164         u8 stop_needed = 0;
 165         u16 new_apps = g_apps;
 166         struct net_device *old_net_dev = NULL;
 167         struct oz_pd *free_pd = NULL;
 168
 169         if (cur_pd) {
 170                 pd = cur_pd;
 171                 spin_lock_bh(&g_polling_lock);
 172         } else {
 173                 struct oz_pd *pd2 = NULL;
 174                 struct list_head *e;
 175                 pd = oz_pd_alloc(pd_addr);
 176                 if (pd == NULL)
 177                         return NULL;
 178                 getnstimeofday(&pd->last_rx_timestamp);
 179                 spin_lock_bh(&g_polling_lock);
 180                 list_for_each(e, &g_pd_list) {
 181                         pd2 = container_of(e, struct oz_pd, link);
 182                         if (memcmp(pd2->mac_addr, pd_addr, ETH_ALEN) == 0) {
 183                                 free_pd = pd;
 184                                 pd = pd2;
 185                                 break;
 186                         }
 187                 }
 188                 if (pd != pd2)
 189                         list_add_tail(&pd->link, &g_pd_list);
 190         }
 191         if (pd == NULL) {
 192                 spin_unlock_bh(&g_polling_lock);
 193                 return NULL;
 194         }
 195         if (pd->net_dev != net_dev) {
 196                 old_net_dev = pd->net_dev;
 197                 dev_hold(net_dev);
 198                 pd->net_dev = net_dev;
 199         }
 200         oz_dbg(ON, "Host vendor: %d\n", body->host_vendor);
 201         pd->max_tx_size = OZ_MAX_TX_SIZE;
 202         pd->mode = body->mode;
 203         pd->pd_info = body->pd_info;
 204         if (pd->mode & OZ_F_ISOC_NO_ELTS) {
 205                 pd->ms_per_isoc = body->ms_per_isoc;
 206                 if (!pd->ms_per_isoc)
 207                         pd->ms_per_isoc = 4;
 208
 209                 switch (body->ms_isoc_latency & OZ_LATENCY_MASK) {
 210                 case OZ_ONE_MS_LATENCY:
 211                         pd->isoc_latency = (body->ms_isoc_latency &
 212                                         ~OZ_LATENCY_MASK) / pd->ms_per_isoc;
 213                         break;
 214                 case OZ_TEN_MS_LATENCY:
 215                         pd->isoc_latency = ((body->ms_isoc_latency &
 216                                 ~OZ_LATENCY_MASK) * 10) / pd->ms_per_isoc;
 217                         break;
 218                 default:
 219                         pd->isoc_latency = OZ_MAX_TX_QUEUE_ISOC;
 220                 }
 221         }
 222         if (body->max_len_div16)
 223                 pd->max_tx_size = ((u16)body->max_len_div16)<<4;
 224         oz_dbg(ON, "Max frame:%u Ms per isoc:%u\n",
 225                pd->max_tx_size, pd->ms_per_isoc);
 226         pd->max_stream_buffering = 3*1024;
 227         pd->pulse_period = OZ_QUANTUM;
 228         pd_set_presleep(pd, body->presleep, 0);
 229         pd_set_keepalive(pd, body->keep_alive);
 230
 231         new_apps &= le16_to_cpu(get_unaligned(&body->apps));
 232         if ((new_apps & 0x1) && (body->session_id)) {
 233                 if (pd->session_id) {
 234                         if (pd->session_id != body->session_id) {
 235                                 rsp_status = OZ_STATUS_SESSION_MISMATCH;
 236                                 goto done;
 237                         }
 238                 } else {
 239                         new_apps &= ~0x1;  /* Resume not permitted */
 240                         pd->session_id =
 241                                 oz_get_new_session_id(body->session_id);
 242                 }
 243         } else {
 244                 if (pd->session_id && !body->session_id) {
 245                         rsp_status = OZ_STATUS_SESSION_TEARDOWN;
 246                         stop_needed = 1;
 247                 } else {
 248                         new_apps &= ~0x1;  /* Resume not permitted */
 249                         pd->session_id =
 250                                 oz_get_new_session_id(body->session_id);
 251                 }
 252         }
 253 done:
 254         if (rsp_status == OZ_STATUS_SUCCESS) {
 255                 u16 start_apps = new_apps & ~pd->total_apps & ~0x1;
 256                 u16 stop_apps = pd->total_apps & ~new_apps & ~0x1;
 257                 u16 resume_apps = new_apps & pd->paused_apps  & ~0x1;
 258                 spin_unlock_bh(&g_polling_lock);
 259                 oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
 260                 oz_dbg(ON, "new_apps=0x%x total_apps=0x%x paused_apps=0x%x\n",
 261                        new_apps, pd->total_apps, pd->paused_apps);
 262                 if (start_apps) {
 263                         if (oz_services_start(pd, start_apps, 0))
 264                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 265                 }
 266                 if (resume_apps)
 267                         if (oz_services_start(pd, resume_apps, 1))
 268                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 269                 if (stop_apps)
 270                         oz_services_stop(pd, stop_apps, 0);
 271                 oz_pd_request_heartbeat(pd);
 272         } else {
 273                 spin_unlock_bh(&g_polling_lock);
 274         }
 275         oz_send_conn_rsp(pd, rsp_status);
 276         if (rsp_status != OZ_STATUS_SUCCESS) {
 277                 if (stop_needed)
 278                         oz_pd_stop(pd);
 279                 oz_pd_put(pd);
 280                 pd = NULL;
 281         }
 282         if (old_net_dev)
 283                 dev_put(old_net_dev);
 284         if (free_pd)
 285                 oz_pd_destroy(free_pd);
 286         return pd;
 287 }
 288
 289 /*
 290  * Context: softirq-serialized
 291  */
 292 static void oz_add_farewell(struct oz_pd *pd, u8 ep_num, u8 index,
 293                         const u8 *report, u8 len)
 294 {
 295         struct oz_farewell *f;
 296         struct oz_farewell *f2;
 297         int found = 0;
 298
 299         f = kmalloc(sizeof(struct oz_farewell) + len, GFP_ATOMIC);
 300         if (!f)
 301                 return;
 302         f->ep_num = ep_num;
 303         f->index = index;
 304         f->len = len;
 305         memcpy(f->report, report, len);
 306         oz_dbg(ON, "RX: Adding farewell report\n");
 307         spin_lock(&g_polling_lock);
 308         list_for_each_entry(f2, &pd->farewell_list, link) {
 309                 if ((f2->ep_num == ep_num) && (f2->index == index)) {
 310                         found = 1;
 311                         list_del(&f2->link);
 312                         break;
 313                 }
 314         }
 315         list_add_tail(&f->link, &pd->farewell_list);
 316         spin_unlock(&g_polling_lock);
 317         if (found)
 318                 kfree(f2);
 319 }
 320
 321 /*
 322  * Context: softirq-serialized
 323  */
 324 static void oz_rx_frame(struct sk_buff *skb)
 325 {
 326         u8 *mac_hdr;
 327         u8 *src_addr;
 328         struct oz_elt *elt;
 329         int length;
 330         struct oz_pd *pd = NULL;
 331         struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb);
 332         struct timespec current_time;
 333         int dup = 0;
 334         u32 pkt_num;
 335
 336         oz_dbg(RX_FRAMES, "RX frame PN=0x%x LPN=0x%x control=0x%x\n",
 337                oz_hdr->pkt_num, oz_hdr->last_pkt_num, oz_hdr->control);
 338         mac_hdr = skb_mac_header(skb);
 339         src_addr = &mac_hdr[ETH_ALEN];
 340         length = skb->len;
 341
 342         /* Check the version field */
 343         if (oz_get_prot_ver(oz_hdr->control) != OZ_PROTOCOL_VERSION) {
 344                 oz_dbg(ON, "Incorrect protocol version: %d\n",
 345                        oz_get_prot_ver(oz_hdr->control));
 346                 goto done;
 347         }
 348
 349         pkt_num = le32_to_cpu(get_unaligned(&oz_hdr->pkt_num));
 350
 351         pd = oz_pd_find(src_addr);
 352         if (pd) {
 353                 if (!(pd->state & OZ_PD_S_CONNECTED))
 354                         oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
 355                 getnstimeofday(&current_time);
 356                 if ((current_time.tv_sec != pd->last_rx_timestamp.tv_sec) ||
 357                         (pd->presleep < MSEC_PER_SEC))  {
 358                         oz_timer_add(pd, OZ_TIMER_TOUT, pd->presleep);
 359                         pd->last_rx_timestamp = current_time;
 360                 }
 361                 if (pkt_num != pd->last_rx_pkt_num) {
 362                         pd->last_rx_pkt_num = pkt_num;
 363                 } else {
 364                         dup = 1;
 365                         oz_dbg(ON, "Duplicate frame\n");
 366                 }
 367         }
 368
 369         if (pd && !dup && ((pd->mode & OZ_MODE_MASK) == OZ_MODE_TRIGGERED)) {
 370                 oz_dbg(RX_FRAMES, "Received TRIGGER Frame\n");
 371                 pd->last_sent_frame = &pd->tx_queue;
 372                 if (oz_hdr->control & OZ_F_ACK) {
 373                         /* Retire completed frames */
 374                         oz_retire_tx_frames(pd, oz_hdr->last_pkt_num);
 375                 }
 376                 if ((oz_hdr->control & OZ_F_ACK_REQUESTED) &&
 377                                 (pd->state == OZ_PD_S_CONNECTED)) {
 378                         int backlog = pd->nb_queued_frames;
 379                         pd->trigger_pkt_num = pkt_num;
 380                         /* Send queued frames */
 381                         oz_send_queued_frames(pd, backlog);
 382                 }
 383         }
 384
 385         length -= sizeof(struct oz_hdr);
 386         elt = (struct oz_elt *)((u8 *)oz_hdr + sizeof(struct oz_hdr));
 387
 388         while (length >= sizeof(struct oz_elt)) {
 389                 length -= sizeof(struct oz_elt) + elt->length;
 390                 if (length < 0)
 391                         break;
 392                 switch (elt->type) {
 393                 case OZ_ELT_CONNECT_REQ:
 394                         oz_dbg(ON, "RX: OZ_ELT_CONNECT_REQ\n");
 395                         pd = oz_connect_req(pd, elt, src_addr, skb->dev);
 396                         break;
 397                 case OZ_ELT_DISCONNECT:
 398                         oz_dbg(ON, "RX: OZ_ELT_DISCONNECT\n");
 399                         if (pd)
 400                                 oz_pd_sleep(pd);
 401                         break;
 402                 case OZ_ELT_UPDATE_PARAM_REQ: {
 403                                 struct oz_elt_update_param *body =
 404                                         (struct oz_elt_update_param *)(elt + 1);
 405                                 oz_dbg(ON, "RX: OZ_ELT_UPDATE_PARAM_REQ\n");
 406                                 if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 407                                         spin_lock(&g_polling_lock);
 408                                         pd_set_keepalive(pd, body->keepalive);
 409                                         pd_set_presleep(pd, body->presleep, 1);
 410                                         spin_unlock(&g_polling_lock);
 411                                 }
 412                         }
 413                         break;
 414                 case OZ_ELT_FAREWELL_REQ: {
 415                                 struct oz_elt_farewell *body =
 416                                         (struct oz_elt_farewell *)(elt + 1);
 417                                 oz_dbg(ON, "RX: OZ_ELT_FAREWELL_REQ\n");
 418                                 oz_add_farewell(pd, body->ep_num,
 419                                         body->index, body->report,
 420                                         elt->length + 1 - sizeof(*body));
 421                         }
 422                         break;
 423                 case OZ_ELT_APP_DATA:
 424                         if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 425                                 struct oz_app_hdr *app_hdr =
 426                                         (struct oz_app_hdr *)(elt+1);
 427                                 if (dup)
 428                                         break;
 429                                 oz_handle_app_elt(pd, app_hdr->app_id, elt);
 430                         }
 431                         break;
 432                 default:
 433                         oz_dbg(ON, "RX: Unknown elt %02x\n", elt->type);
 434                 }
 435                 elt = oz_next_elt(elt);
 436         }
 437 done:
 438         if (pd)
 439                 oz_pd_put(pd);
 440         consume_skb(skb);
 441 }
 442
 443 /*
 444  * Context: process
 445  */
 446 void oz_protocol_term(void)
 447 {
 448         struct oz_binding *b, *t;
 449
 450         /* Walk the list of bindings and remove each one.
 451          */
 452         spin_lock_bh(&g_binding_lock);
 453         list_for_each_entry_safe(b, t, &g_binding, link) {
 454                 list_del(&b->link);
 455                 spin_unlock_bh(&g_binding_lock);
 456                 dev_remove_pack(&b->ptype);
 457                 if (b->ptype.dev)
 458                         dev_put(b->ptype.dev);
 459                 kfree(b);
 460                 spin_lock_bh(&g_binding_lock);
 461         }
 462         spin_unlock_bh(&g_binding_lock);
 463         /* Walk the list of PDs and stop each one. This causes the PD to be
 464          * removed from the list so we can just pull each one from the head
 465          * of the list.
 466          */
 467         spin_lock_bh(&g_polling_lock);
 468         while (!list_empty(&g_pd_list)) {
 469                 struct oz_pd *pd =
 470                         list_first_entry(&g_pd_list, struct oz_pd, link);
 471                 oz_pd_get(pd);
 472                 spin_unlock_bh(&g_polling_lock);
 473                 oz_pd_stop(pd);
 474                 oz_pd_put(pd);
 475                 spin_lock_bh(&g_polling_lock);
 476         }
 477         spin_unlock_bh(&g_polling_lock);
 478         oz_dbg(ON, "Protocol stopped\n");
 479 }
 480
 481 /*
 482  * Context: softirq
 483  */
 484 void oz_pd_heartbeat_handler(unsigned long data)
 485 {
 486         struct oz_pd *pd = (struct oz_pd *)data;
 487         u16 apps = 0;
 488
 489         spin_lock_bh(&g_polling_lock);
 490         if (pd->state & OZ_PD_S_CONNECTED)
 491                 apps = pd->total_apps;
 492         spin_unlock_bh(&g_polling_lock);
 493         if (apps)
 494                 oz_pd_heartbeat(pd, apps);
 495         oz_pd_put(pd);
 496 }
 497
 498 /*
 499  * Context: softirq
 500  */
 501 void oz_pd_timeout_handler(unsigned long data)
 502 {
 503         int type;
 504         struct oz_pd *pd = (struct oz_pd *)data;
 505
 506         spin_lock_bh(&g_polling_lock);
 507         type = pd->timeout_type;
 508         spin_unlock_bh(&g_polling_lock);
 509         switch (type) {
 510         case OZ_TIMER_TOUT:
 511                 oz_pd_sleep(pd);
 512                 break;
 513         case OZ_TIMER_STOP:
 514                 oz_pd_stop(pd);
 515                 break;
 516         }
 517         oz_pd_put(pd);
 518 }
 519
 520 /*
 521  * Context: Interrupt
 522  */
 523 enum hrtimer_restart oz_pd_heartbeat_event(struct hrtimer *timer)
 524 {
 525         struct oz_pd *pd;
 526
 527         pd = container_of(timer, struct oz_pd, heartbeat);
 528         hrtimer_forward_now(timer, ktime_set(pd->pulse_period /
 529         MSEC_PER_SEC, (pd->pulse_period % MSEC_PER_SEC) * NSEC_PER_MSEC));
 530         oz_pd_get(pd);
 531         tasklet_schedule(&pd->heartbeat_tasklet);
 532         return HRTIMER_RESTART;
 533 }
 534
 535 /*
 536  * Context: Interrupt
 537  */
 538 enum hrtimer_restart oz_pd_timeout_event(struct hrtimer *timer)
 539 {
 540         struct oz_pd *pd;
 541
 542         pd = container_of(timer, struct oz_pd, timeout);
 543         oz_pd_get(pd);
 544         tasklet_schedule(&pd->timeout_tasklet);
 545         return HRTIMER_NORESTART;
 546 }
 547
 548 /*
 549  * Context: softirq or process
 550  */
 551 void oz_timer_add(struct oz_pd *pd, int type, unsigned long due_time)
 552 {
 553         spin_lock_bh(&g_polling_lock);
 554         switch (type) {
 555         case OZ_TIMER_TOUT:
 556         case OZ_TIMER_STOP:
 557                 if (hrtimer_active(&pd->timeout)) {
 558                         hrtimer_set_expires(&pd->timeout, ktime_set(due_time /
 559                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 560                                                         NSEC_PER_MSEC));
 561                         hrtimer_start_expires(&pd->timeout, HRTIMER_MODE_REL);
 562                 } else {
 563                         hrtimer_start(&pd->timeout, ktime_set(due_time /
 564                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 565                                         NSEC_PER_MSEC), HRTIMER_MODE_REL);
 566                 }
 567                 pd->timeout_type = type;
 568                 break;
 569         case OZ_TIMER_HEARTBEAT:
 570                 if (!hrtimer_active(&pd->heartbeat))
 571                         hrtimer_start(&pd->heartbeat, ktime_set(due_time /
 572                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 573                                         NSEC_PER_MSEC), HRTIMER_MODE_REL);
 574                 break;
 575         }
 576         spin_unlock_bh(&g_polling_lock);
 577 }
 578
 579 /*
 580  * Context: softirq or process
 581  */
 582 void oz_pd_request_heartbeat(struct oz_pd *pd)
 583 {
 584         oz_timer_add(pd, OZ_TIMER_HEARTBEAT, pd->pulse_period > 0 ?
 585                                         pd->pulse_period : OZ_QUANTUM);
 586 }
 587
 588 /*
 589  * Context: softirq or process
 590  */
 591 struct oz_pd *oz_pd_find(const u8 *mac_addr)
 592 {
 593         struct oz_pd *pd;
 594         struct list_head *e;
 595
 596         spin_lock_bh(&g_polling_lock);
 597         list_for_each(e, &g_pd_list) {
 598                 pd = container_of(e, struct oz_pd, link);
 599                 if (memcmp(pd->mac_addr, mac_addr, ETH_ALEN) == 0) {
 600                         atomic_inc(&pd->ref_count);
 601                         spin_unlock_bh(&g_polling_lock);
 602                         return pd;
 603                 }
 604         }
 605         spin_unlock_bh(&g_polling_lock);
 606         return NULL;
 607 }
 608
 609 /*
 610  * Context: process
 611  */
 612 void oz_app_enable(int app_id, int enable)
 613 {
 614         if (app_id <= OZ_APPID_MAX) {
 615                 spin_lock_bh(&g_polling_lock);
 616                 if (enable)
 617                         g_apps |= (1<<app_id);
 618                 else
 619                         g_apps &= ~(1<<app_id);
 620                 spin_unlock_bh(&g_polling_lock);
 621         }
 622 }
 623
 624 /*
 625  * Context: softirq
 626  */
 627 static int oz_pkt_recv(struct sk_buff *skb, struct net_device *dev,
 628                 struct packet_type *pt, struct net_device *orig_dev)
 629 {
 630         skb = skb_share_check(skb, GFP_ATOMIC);
 631         if (skb == NULL)
 632                 return 0;
 633         spin_lock_bh(&g_rx_queue.lock);
 634         if (g_processing_rx) {
 635                 /* We already hold the lock so use __ variant.
 636                  */
 637                 __skb_queue_head(&g_rx_queue, skb);
 638                 spin_unlock_bh(&g_rx_queue.lock);
 639         } else {
 640                 g_processing_rx = 1;
 641                 do {
 642
 643                         spin_unlock_bh(&g_rx_queue.lock);
 644                         oz_rx_frame(skb);
 645                         spin_lock_bh(&g_rx_queue.lock);
 646                         if (skb_queue_empty(&g_rx_queue)) {
 647                                 g_processing_rx = 0;
 648                                 spin_unlock_bh(&g_rx_queue.lock);
 649                                 break;
 650                         }
 651                         /* We already hold the lock so use __ variant.
 652                          */
 653                         skb = __skb_dequeue(&g_rx_queue);
 654                 } while (1);
 655         }
 656         return 0;
 657 }
 658
 659 /*
 660  * Context: process
 661  */
 662 void oz_binding_add(const char *net_dev)
 663 {
 664         struct oz_binding *binding;
 665
 666         binding = kmalloc(sizeof(struct oz_binding), GFP_KERNEL);
 667         if (binding) {
 668                 binding->ptype.type = __constant_htons(OZ_ETHERTYPE);
 669                 binding->ptype.func = oz_pkt_recv;
 670                 memcpy(binding->name, net_dev, OZ_MAX_BINDING_LEN);
 671                 if (net_dev && *net_dev) {
 672                         oz_dbg(ON, "Adding binding: %s\n", net_dev);
 673                         binding->ptype.dev =
 674                                 dev_get_by_name(&init_net, net_dev);
 675                         if (binding->ptype.dev == NULL) {
 676                                 oz_dbg(ON, "Netdev %s not found\n", net_dev);
 677                                 kfree(binding);
 678                                 binding = NULL;
 679                         }
 680                 } else {
 681                         oz_dbg(ON, "Binding to all netcards\n");
 682                         binding->ptype.dev = NULL;
 683                 }
 684                 if (binding) {
 685                         dev_add_pack(&binding->ptype);
 686                         spin_lock_bh(&g_binding_lock);
 687                         list_add_tail(&binding->link, &g_binding);
 688                         spin_unlock_bh(&g_binding_lock);
 689                 }
 690         }
 691 }
 692
 693 /*
 694  * Context: process
 695  */
 696 static void pd_stop_all_for_device(struct net_device *net_dev)
 697 {
 698         struct list_head h;
 699         struct oz_pd *pd;
 700         struct oz_pd *n;
 701
 702         INIT_LIST_HEAD(&h);
 703         spin_lock_bh(&g_polling_lock);
 704         list_for_each_entry_safe(pd, n, &g_pd_list, link) {
 705                 if (pd->net_dev == net_dev) {
 706                         list_move(&pd->link, &h);
 707                         oz_pd_get(pd);
 708                 }
 709         }
 710         spin_unlock_bh(&g_polling_lock);
 711         while (!list_empty(&h)) {
 712                 pd = list_first_entry(&h, struct oz_pd, link);
 713                 oz_pd_stop(pd);
 714                 oz_pd_put(pd);
 715         }
 716 }
 717
 718 /*
 719  * Context: process
 720  */
 721 void oz_binding_remove(const char *net_dev)
 722 {
 723         struct oz_binding *binding;
 724         int found = 0;
 725
 726         oz_dbg(ON, "Removing binding: %s\n", net_dev);
 727         spin_lock_bh(&g_binding_lock);
 728         list_for_each_entry(binding, &g_binding, link) {
 729                 if (strncmp(binding->name, net_dev, OZ_MAX_BINDING_LEN) == 0) {
 730                         oz_dbg(ON, "Binding '%s' found\n", net_dev);
 731                         found = 1;
 732                         break;
 733                 }
 734         }
 735         spin_unlock_bh(&g_binding_lock);
 736         if (found) {
 737                 dev_remove_pack(&binding->ptype);
 738                 if (binding->ptype.dev) {
 739                         dev_put(binding->ptype.dev);
 740                         pd_stop_all_for_device(binding->ptype.dev);
 741                 }
 742                 list_del(&binding->link);
 743                 kfree(binding);
 744         }
 745 }
 746
 747 /*
 748  * Context: process
 749  */
 750 static char *oz_get_next_device_name(char *s, char *dname, int max_size)
 751 {
 752         while (*s == ',')
 753                 s++;
 754         while (*s && (*s != ',') && max_size > 1) {
 755                 *dname++ = *s++;
 756                 max_size--;
 757         }
 758         *dname = 0;
 759         return s;
 760 }
 761
 762 /*
 763  * Context: process
 764  */
 765 int oz_protocol_init(char *devs)
 766 {
 767         skb_queue_head_init(&g_rx_queue);
 768         if (devs && (devs[0] == '*')) {
 769                 oz_binding_add(NULL);
 770         } else {
 771                 char d[32];
 772                 while (*devs) {
 773                         devs = oz_get_next_device_name(devs, d, sizeof(d));
 774                         if (d[0])
 775                                 oz_binding_add(d);
 776                 }
 777         }
 778         return 0;
 779 }
 780
 781 /*
 782  * Context: process
 783  */
 784 int oz_get_pd_list(struct oz_mac_addr *addr, int max_count)
 785 {
 786         struct oz_pd *pd;
 787         struct list_head *e;
 788         int count = 0;
 789
 790         spin_lock_bh(&g_polling_lock);
 791         list_for_each(e, &g_pd_list) {
 792                 if (count >= max_count)
 793                         break;
 794                 pd = container_of(e, struct oz_pd, link);
 795                 memcpy(&addr[count++], pd->mac_addr, ETH_ALEN);
 796         }
 797         spin_unlock_bh(&g_polling_lock);
 798         return count;
 799 }
 800
 801 void oz_polling_lock_bh(void)
 802 {
 803         spin_lock_bh(&g_polling_lock);
 804 }
 805
 806 void oz_polling_unlock_bh(void)
 807 {
 808         spin_unlock_bh(&g_polling_lock);
 809 }