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/etherdevice.h>
  13 #include <linux/errno.h>
  14 #include <linux/ieee80211.h>
  15 #include "ozdbg.h"
  16 #include "ozprotocol.h"
  17 #include "ozeltbuf.h"
  18 #include "ozpd.h"
  19 #include "ozproto.h"
  20 #include "ozusbsvc.h"
  21
  22 #include "ozappif.h"
  23 #include <asm/unaligned.h>
  24 #include <linux/uaccess.h>
  25 #include <net/psnap.h>
  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 struct oz_binding {
  36         struct packet_type ptype;
  37         char name[OZ_MAX_BINDING_LEN];
  38         struct list_head link;
  39 };
  40
  41 /*
  42  * Static external variables.
  43  */
  44 static DEFINE_SPINLOCK(g_polling_lock);
  45 static LIST_HEAD(g_pd_list);
  46 static LIST_HEAD(g_binding);
  47 static DEFINE_SPINLOCK(g_binding_lock);
  48 static struct sk_buff_head g_rx_queue;
  49 static u8 g_session_id;
  50 static u16 g_apps = 0x1;
  51 static int g_processing_rx;
  52
  53 /*
  54  * Context: softirq-serialized
  55  */
  56 static u8 oz_get_new_session_id(u8 exclude)
  57 {
  58         if (++g_session_id == 0)
  59                 g_session_id = 1;
  60         if (g_session_id == exclude) {
  61                 if (++g_session_id == 0)
  62                         g_session_id = 1;
  63         }
  64         return g_session_id;
  65 }
  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 /*
 114  * Context: softirq-serialized
 115  */
 116 static void pd_set_keepalive(struct oz_pd *pd, u8 kalive)
 117 {
 118         unsigned long keep_alive = kalive & OZ_KALIVE_VALUE_MASK;
 119
 120         switch (kalive & OZ_KALIVE_TYPE_MASK) {
 121         case OZ_KALIVE_SPECIAL:
 122                 pd->keep_alive = keep_alive * 1000*60*60*24*20;
 123                 break;
 124         case OZ_KALIVE_SECS:
 125                 pd->keep_alive = keep_alive*1000;
 126                 break;
 127         case OZ_KALIVE_MINS:
 128                 pd->keep_alive = keep_alive*1000*60;
 129                 break;
 130         case OZ_KALIVE_HOURS:
 131                 pd->keep_alive = keep_alive*1000*60*60;
 132                 break;
 133         default:
 134                 pd->keep_alive = 0;
 135         }
 136         oz_dbg(ON, "Keepalive = %lu mSec\n", pd->keep_alive);
 137 }
 138
 139 /*
 140  * Context: softirq-serialized
 141  */
 142 static void pd_set_presleep(struct oz_pd *pd, u8 presleep, u8 start_timer)
 143 {
 144         if (presleep)
 145                 pd->presleep = presleep*100;
 146         else
 147                 pd->presleep = OZ_PRESLEEP_TOUT;
 148         if (start_timer) {
 149                 spin_unlock(&g_polling_lock);
 150                 oz_timer_add(pd, OZ_TIMER_TOUT, pd->presleep);
 151                 spin_lock(&g_polling_lock);
 152         }
 153         oz_dbg(ON, "Presleep time = %lu mSec\n", pd->presleep);
 154 }
 155
 156 /*
 157  * Context: softirq-serialized
 158  */
 159 static struct oz_pd *oz_connect_req(struct oz_pd *cur_pd, struct oz_elt *elt,
 160                         const u8 *pd_addr, struct net_device *net_dev)
 161 {
 162         struct oz_pd *pd;
 163         struct oz_elt_connect_req *body =
 164                         (struct oz_elt_connect_req *)(elt+1);
 165         u8 rsp_status = OZ_STATUS_SUCCESS;
 166         u8 stop_needed = 0;
 167         u16 new_apps = g_apps;
 168         struct net_device *old_net_dev = NULL;
 169         struct oz_pd *free_pd = NULL;
 170
 171         if (cur_pd) {
 172                 pd = cur_pd;
 173                 spin_lock_bh(&g_polling_lock);
 174         } else {
 175                 struct oz_pd *pd2 = NULL;
 176                 struct list_head *e;
 177                 pd = oz_pd_alloc(pd_addr);
 178                 if (pd == NULL)
 179                         return NULL;
 180                 getnstimeofday(&pd->last_rx_timestamp);
 181                 spin_lock_bh(&g_polling_lock);
 182                 list_for_each(e, &g_pd_list) {
 183                         pd2 = container_of(e, struct oz_pd, link);
 184                         if (ether_addr_equal(pd2->mac_addr, pd_addr)) {
 185                                 free_pd = pd;
 186                                 pd = pd2;
 187                                 break;
 188                         }
 189                 }
 190                 if (pd != pd2)
 191                         list_add_tail(&pd->link, &g_pd_list);
 192         }
 193         if (pd == NULL) {
 194                 spin_unlock_bh(&g_polling_lock);
 195                 return NULL;
 196         }
 197         if (pd->net_dev != net_dev) {
 198                 old_net_dev = pd->net_dev;
 199                 dev_hold(net_dev);
 200                 pd->net_dev = net_dev;
 201         }
 202         oz_dbg(ON, "Host vendor: %d\n", body->host_vendor);
 203         pd->max_tx_size = OZ_MAX_TX_SIZE;
 204         pd->mode = body->mode;
 205         pd->pd_info = body->pd_info;
 206         if (pd->mode & OZ_F_ISOC_NO_ELTS) {
 207                 pd->ms_per_isoc = body->ms_per_isoc;
 208                 if (!pd->ms_per_isoc)
 209                         pd->ms_per_isoc = 4;
 210
 211                 switch (body->ms_isoc_latency & OZ_LATENCY_MASK) {
 212                 case OZ_ONE_MS_LATENCY:
 213                         pd->isoc_latency = (body->ms_isoc_latency &
 214                                         ~OZ_LATENCY_MASK) / pd->ms_per_isoc;
 215                         break;
 216                 case OZ_TEN_MS_LATENCY:
 217                         pd->isoc_latency = ((body->ms_isoc_latency &
 218                                 ~OZ_LATENCY_MASK) * 10) / pd->ms_per_isoc;
 219                         break;
 220                 default:
 221                         pd->isoc_latency = OZ_MAX_TX_QUEUE_ISOC;
 222                 }
 223         }
 224         if (body->max_len_div16)
 225                 pd->max_tx_size = ((u16)body->max_len_div16)<<4;
 226         oz_dbg(ON, "Max frame:%u Ms per isoc:%u\n",
 227                pd->max_tx_size, pd->ms_per_isoc);
 228         pd->max_stream_buffering = 3*1024;
 229         pd->pulse_period = OZ_QUANTUM;
 230         pd_set_presleep(pd, body->presleep, 0);
 231         pd_set_keepalive(pd, body->keep_alive);
 232
 233         new_apps &= le16_to_cpu(get_unaligned(&body->apps));
 234         if ((new_apps & 0x1) && (body->session_id)) {
 235                 if (pd->session_id) {
 236                         if (pd->session_id != body->session_id) {
 237                                 rsp_status = OZ_STATUS_SESSION_MISMATCH;
 238                                 goto done;
 239                         }
 240                 } else {
 241                         new_apps &= ~0x1;  /* Resume not permitted */
 242                         pd->session_id =
 243                                 oz_get_new_session_id(body->session_id);
 244                 }
 245         } else {
 246                 if (pd->session_id && !body->session_id) {
 247                         rsp_status = OZ_STATUS_SESSION_TEARDOWN;
 248                         stop_needed = 1;
 249                 } else {
 250                         new_apps &= ~0x1;  /* Resume not permitted */
 251                         pd->session_id =
 252                                 oz_get_new_session_id(body->session_id);
 253                 }
 254         }
 255 done:
 256         if (rsp_status == OZ_STATUS_SUCCESS) {
 257                 u16 start_apps = new_apps & ~pd->total_apps & ~0x1;
 258                 u16 stop_apps = pd->total_apps & ~new_apps & ~0x1;
 259                 u16 resume_apps = new_apps & pd->paused_apps  & ~0x1;
 260                 spin_unlock_bh(&g_polling_lock);
 261                 oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
 262                 oz_dbg(ON, "new_apps=0x%x total_apps=0x%x paused_apps=0x%x\n",
 263                        new_apps, pd->total_apps, pd->paused_apps);
 264                 if (start_apps) {
 265                         if (oz_services_start(pd, start_apps, 0))
 266                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 267                 }
 268                 if (resume_apps)
 269                         if (oz_services_start(pd, resume_apps, 1))
 270                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 271                 if (stop_apps)
 272                         oz_services_stop(pd, stop_apps, 0);
 273                 oz_pd_request_heartbeat(pd);
 274         } else {
 275                 spin_unlock_bh(&g_polling_lock);
 276         }
 277         oz_send_conn_rsp(pd, rsp_status);
 278         if (rsp_status != OZ_STATUS_SUCCESS) {
 279                 if (stop_needed)
 280                         oz_pd_stop(pd);
 281                 oz_pd_put(pd);
 282                 pd = NULL;
 283         }
 284         if (old_net_dev)
 285                 dev_put(old_net_dev);
 286         if (free_pd)
 287                 oz_pd_destroy(free_pd);
 288         return pd;
 289 }
 290
 291 /*
 292  * Context: softirq-serialized
 293  */
 294 static void oz_add_farewell(struct oz_pd *pd, u8 ep_num, u8 index,
 295                         const u8 *report, u8 len)
 296 {
 297         struct oz_farewell *f;
 298         struct oz_farewell *f2;
 299         int found = 0;
 300
 301         f = kmalloc(sizeof(struct oz_farewell) + len, GFP_ATOMIC);
 302         if (!f)
 303                 return;
 304         f->ep_num = ep_num;
 305         f->index = index;
 306         f->len = len;
 307         memcpy(f->report, report, len);
 308         oz_dbg(ON, "RX: Adding farewell report\n");
 309         spin_lock(&g_polling_lock);
 310         list_for_each_entry(f2, &pd->farewell_list, link) {
 311                 if ((f2->ep_num == ep_num) && (f2->index == index)) {
 312                         found = 1;
 313                         list_del(&f2->link);
 314                         break;
 315                 }
 316         }
 317         list_add_tail(&f->link, &pd->farewell_list);
 318         spin_unlock(&g_polling_lock);
 319         if (found)
 320                 kfree(f2);
 321 }
 322
 323 /*
 324  * Context: softirq-serialized
 325  */
 326 static void oz_rx_frame(struct sk_buff *skb)
 327 {
 328         u8 *mac_hdr;
 329         u8 *src_addr;
 330         struct oz_elt *elt;
 331         int length;
 332         struct oz_pd *pd = NULL;
 333         struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb);
 334         struct timespec current_time;
 335         int dup = 0;
 336         u32 pkt_num;
 337
 338         oz_dbg(RX_FRAMES, "RX frame PN=0x%x LPN=0x%x control=0x%x\n",
 339                oz_hdr->pkt_num, oz_hdr->last_pkt_num, oz_hdr->control);
 340         mac_hdr = skb_mac_header(skb);
 341         src_addr = &mac_hdr[ETH_ALEN] ;
 342         length = skb->len;
 343
 344         /* Check the version field */
 345         if (oz_get_prot_ver(oz_hdr->control) != OZ_PROTOCOL_VERSION) {
 346                 oz_dbg(ON, "Incorrect protocol version: %d\n",
 347                        oz_get_prot_ver(oz_hdr->control));
 348                 goto done;
 349         }
 350
 351         pkt_num = le32_to_cpu(get_unaligned(&oz_hdr->pkt_num));
 352
 353         pd = oz_pd_find(src_addr);
 354         if (pd) {
 355                 if (!(pd->state & OZ_PD_S_CONNECTED))
 356                         oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
 357                 getnstimeofday(&current_time);
 358                 if ((current_time.tv_sec != pd->last_rx_timestamp.tv_sec) ||
 359                         (pd->presleep < MSEC_PER_SEC))  {
 360                         oz_timer_add(pd, OZ_TIMER_TOUT, pd->presleep);
 361                         pd->last_rx_timestamp = current_time;
 362                 }
 363                 if (pkt_num != pd->last_rx_pkt_num) {
 364                         pd->last_rx_pkt_num = pkt_num;
 365                 } else {
 366                         dup = 1;
 367                         oz_dbg(ON, "Duplicate frame\n");
 368                 }
 369         }
 370
 371         if (pd && !dup && ((pd->mode & OZ_MODE_MASK) == OZ_MODE_TRIGGERED)) {
 372                 oz_dbg(RX_FRAMES, "Received TRIGGER Frame\n");
 373                 pd->last_sent_frame = &pd->tx_queue;
 374                 if (oz_hdr->control & OZ_F_ACK) {
 375                         /* Retire completed frames */
 376                         oz_retire_tx_frames(pd, oz_hdr->last_pkt_num);
 377                 }
 378                 if ((oz_hdr->control & OZ_F_ACK_REQUESTED) &&
 379                                 (pd->state == OZ_PD_S_CONNECTED)) {
 380                         int backlog = pd->nb_queued_frames;
 381                         pd->trigger_pkt_num = pkt_num;
 382                         /* Send queued frames */
 383                         oz_send_queued_frames(pd, backlog);
 384                 }
 385         }
 386
 387         length -= sizeof(struct oz_hdr);
 388         elt = (struct oz_elt *)((u8 *)oz_hdr + sizeof(struct oz_hdr));
 389
 390         while (length >= sizeof(struct oz_elt)) {
 391                 length -= sizeof(struct oz_elt) + elt->length;
 392                 if (length < 0)
 393                         break;
 394                 switch (elt->type) {
 395                 case OZ_ELT_CONNECT_REQ:
 396                         oz_dbg(ON, "RX: OZ_ELT_CONNECT_REQ\n");
 397                         pd = oz_connect_req(pd, elt, src_addr, skb->dev);
 398                         break;
 399                 case OZ_ELT_DISCONNECT:
 400                         oz_dbg(ON, "RX: OZ_ELT_DISCONNECT\n");
 401                         if (pd)
 402                                 oz_pd_sleep(pd);
 403                         break;
 404                 case OZ_ELT_UPDATE_PARAM_REQ: {
 405                                 struct oz_elt_update_param *body =
 406                                         (struct oz_elt_update_param *)(elt + 1);
 407                                 oz_dbg(ON, "RX: OZ_ELT_UPDATE_PARAM_REQ\n");
 408                                 if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 409                                         spin_lock(&g_polling_lock);
 410                                         pd_set_keepalive(pd, body->keepalive);
 411                                         pd_set_presleep(pd, body->presleep, 1);
 412                                         spin_unlock(&g_polling_lock);
 413                                 }
 414                         }
 415                         break;
 416                 case OZ_ELT_FAREWELL_REQ: {
 417                                 struct oz_elt_farewell *body =
 418                                         (struct oz_elt_farewell *)(elt + 1);
 419                                 oz_dbg(ON, "RX: OZ_ELT_FAREWELL_REQ\n");
 420                                 oz_add_farewell(pd, body->ep_num,
 421                                         body->index, body->report,
 422                                         elt->length + 1 - sizeof(*body));
 423                         }
 424                         break;
 425                 case OZ_ELT_APP_DATA:
 426                         if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 427                                 struct oz_app_hdr *app_hdr =
 428                                         (struct oz_app_hdr *)(elt+1);
 429                                 if (dup)
 430                                         break;
 431                                 oz_handle_app_elt(pd, app_hdr->app_id, elt);
 432                         }
 433                         break;
 434                 default:
 435                         oz_dbg(ON, "RX: Unknown elt %02x\n", elt->type);
 436                 }
 437                 elt = oz_next_elt(elt);
 438         }
 439 done:
 440         if (pd)
 441                 oz_pd_put(pd);
 442         consume_skb(skb);
 443 }
 444
 445 /*
 446  * Context: process
 447  */
 448 void oz_protocol_term(void)
 449 {
 450         struct oz_binding *b, *t;
 451
 452         /* Walk the list of bindings and remove each one.
 453          */
 454         spin_lock_bh(&g_binding_lock);
 455         list_for_each_entry_safe(b, t, &g_binding, link) {
 456                 list_del(&b->link);
 457                 spin_unlock_bh(&g_binding_lock);
 458                 dev_remove_pack(&b->ptype);
 459                 if (b->ptype.dev)
 460                         dev_put(b->ptype.dev);
 461                 kfree(b);
 462                 spin_lock_bh(&g_binding_lock);
 463         }
 464         spin_unlock_bh(&g_binding_lock);
 465         /* Walk the list of PDs and stop each one. This causes the PD to be
 466          * removed from the list so we can just pull each one from the head
 467          * of the list.
 468          */
 469         spin_lock_bh(&g_polling_lock);
 470         while (!list_empty(&g_pd_list)) {
 471                 struct oz_pd *pd =
 472                         list_first_entry(&g_pd_list, struct oz_pd, link);
 473                 oz_pd_get(pd);
 474                 spin_unlock_bh(&g_polling_lock);
 475                 oz_pd_stop(pd);
 476                 oz_pd_put(pd);
 477                 spin_lock_bh(&g_polling_lock);
 478         }
 479         spin_unlock_bh(&g_polling_lock);
 480         oz_dbg(ON, "Protocol stopped\n");
 481 }
 482
 483 /*
 484  * Context: softirq
 485  */
 486 void oz_pd_heartbeat_handler(unsigned long data)
 487 {
 488         struct oz_pd *pd = (struct oz_pd *)data;
 489         u16 apps = 0;
 490
 491         spin_lock_bh(&g_polling_lock);
 492         if (pd->state & OZ_PD_S_CONNECTED)
 493                 apps = pd->total_apps;
 494         spin_unlock_bh(&g_polling_lock);
 495         if (apps)
 496                 oz_pd_heartbeat(pd, apps);
 497         oz_pd_put(pd);
 498 }
 499
 500 /*
 501  * Context: softirq
 502  */
 503 void oz_pd_timeout_handler(unsigned long data)
 504 {
 505         int type;
 506         struct oz_pd *pd = (struct oz_pd *)data;
 507
 508         spin_lock_bh(&g_polling_lock);
 509         type = pd->timeout_type;
 510         spin_unlock_bh(&g_polling_lock);
 511         switch (type) {
 512         case OZ_TIMER_TOUT:
 513                 oz_pd_sleep(pd);
 514                 break;
 515         case OZ_TIMER_STOP:
 516                 oz_pd_stop(pd);
 517                 break;
 518         }
 519         oz_pd_put(pd);
 520 }
 521
 522 /*
 523  * Context: Interrupt
 524  */
 525 enum hrtimer_restart oz_pd_heartbeat_event(struct hrtimer *timer)
 526 {
 527         struct oz_pd *pd;
 528
 529         pd = container_of(timer, struct oz_pd, heartbeat);
 530         hrtimer_forward_now(timer, ktime_set(pd->pulse_period /
 531         MSEC_PER_SEC, (pd->pulse_period % MSEC_PER_SEC) * NSEC_PER_MSEC));
 532         oz_pd_get(pd);
 533         tasklet_schedule(&pd->heartbeat_tasklet);
 534         return HRTIMER_RESTART;
 535 }
 536
 537 /*
 538  * Context: Interrupt
 539  */
 540 enum hrtimer_restart oz_pd_timeout_event(struct hrtimer *timer)
 541 {
 542         struct oz_pd *pd;
 543
 544         pd = container_of(timer, struct oz_pd, timeout);
 545         oz_pd_get(pd);
 546         tasklet_schedule(&pd->timeout_tasklet);
 547         return HRTIMER_NORESTART;
 548 }
 549
 550 /*
 551  * Context: softirq or process
 552  */
 553 void oz_timer_add(struct oz_pd *pd, int type, unsigned long due_time)
 554 {
 555         spin_lock_bh(&g_polling_lock);
 556         switch (type) {
 557         case OZ_TIMER_TOUT:
 558         case OZ_TIMER_STOP:
 559                 if (hrtimer_active(&pd->timeout)) {
 560                         hrtimer_set_expires(&pd->timeout, ktime_set(due_time /
 561                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 562                                                         NSEC_PER_MSEC));
 563                         hrtimer_start_expires(&pd->timeout, HRTIMER_MODE_REL);
 564                 } else {
 565                         hrtimer_start(&pd->timeout, ktime_set(due_time /
 566                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 567                                         NSEC_PER_MSEC), HRTIMER_MODE_REL);
 568                 }
 569                 pd->timeout_type = type;
 570                 break;
 571         case OZ_TIMER_HEARTBEAT:
 572                 if (!hrtimer_active(&pd->heartbeat))
 573                         hrtimer_start(&pd->heartbeat, ktime_set(due_time /
 574                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 575                                         NSEC_PER_MSEC), HRTIMER_MODE_REL);
 576                 break;
 577         }
 578         spin_unlock_bh(&g_polling_lock);
 579 }
 580
 581 /*
 582  * Context: softirq or process
 583  */
 584 void oz_pd_request_heartbeat(struct oz_pd *pd)
 585 {
 586         oz_timer_add(pd, OZ_TIMER_HEARTBEAT, pd->pulse_period > 0 ?
 587                                         pd->pulse_period : OZ_QUANTUM);
 588 }
 589
 590 /*
 591  * Context: softirq or process
 592  */
 593 struct oz_pd *oz_pd_find(const u8 *mac_addr)
 594 {
 595         struct oz_pd *pd;
 596         struct list_head *e;
 597
 598         spin_lock_bh(&g_polling_lock);
 599         list_for_each(e, &g_pd_list) {
 600                 pd = container_of(e, struct oz_pd, link);
 601                 if (ether_addr_equal(pd->mac_addr, mac_addr)) {
 602                         atomic_inc(&pd->ref_count);
 603                         spin_unlock_bh(&g_polling_lock);
 604                         return pd;
 605                 }
 606         }
 607         spin_unlock_bh(&g_polling_lock);
 608         return NULL;
 609 }
 610
 611 /*
 612  * Context: process
 613  */
 614 void oz_app_enable(int app_id, int enable)
 615 {
 616         if (app_id <= OZ_APPID_MAX) {
 617                 spin_lock_bh(&g_polling_lock);
 618                 if (enable)
 619                         g_apps |= (1<<app_id);
 620                 else
 621                         g_apps &= ~(1<<app_id);
 622                 spin_unlock_bh(&g_polling_lock);
 623         }
 624 }
 625
 626 /*
 627  * Context: softirq
 628  */
 629 static int oz_pkt_recv(struct sk_buff *skb, struct net_device *dev,
 630                 struct packet_type *pt, struct net_device *orig_dev)
 631 {
 632         skb = skb_share_check(skb, GFP_ATOMIC);
 633         if (skb == NULL)
 634                 return 0;
 635         spin_lock_bh(&g_rx_queue.lock);
 636         if (g_processing_rx) {
 637                 /* We already hold the lock so use __ variant.
 638                  */
 639                 __skb_queue_head(&g_rx_queue, skb);
 640                 spin_unlock_bh(&g_rx_queue.lock);
 641         } else {
 642                 g_processing_rx = 1;
 643                 do {
 644
 645                         spin_unlock_bh(&g_rx_queue.lock);
 646                         oz_rx_frame(skb);
 647                         spin_lock_bh(&g_rx_queue.lock);
 648                         if (skb_queue_empty(&g_rx_queue)) {
 649                                 g_processing_rx = 0;
 650                                 spin_unlock_bh(&g_rx_queue.lock);
 651                                 break;
 652                         }
 653                         /* We already hold the lock so use __ variant.
 654                          */
 655                         skb = __skb_dequeue(&g_rx_queue);
 656                 } while (1);
 657         }
 658         return 0;
 659 }
 660
 661 /*
 662  * Context: process
 663  */
 664 void oz_binding_add(const char *net_dev)
 665 {
 666         struct oz_binding *binding;
 667
 668         binding = kmalloc(sizeof(struct oz_binding), GFP_KERNEL);
 669         if (binding) {
 670                 binding->ptype.type = __constant_htons(OZ_ETHERTYPE);
 671                 binding->ptype.func = oz_pkt_recv;
 672                 memcpy(binding->name, net_dev, OZ_MAX_BINDING_LEN);
 673                 if (net_dev && *net_dev) {
 674                         oz_dbg(ON, "Adding binding: %s\n", net_dev);
 675                         binding->ptype.dev =
 676                                 dev_get_by_name(&init_net, net_dev);
 677                         if (binding->ptype.dev == NULL) {
 678                                 oz_dbg(ON, "Netdev %s not found\n", net_dev);
 679                                 kfree(binding);
 680                                 binding = NULL;
 681                         }
 682                 } else {
 683                         oz_dbg(ON, "Binding to all netcards\n");
 684                         binding->ptype.dev = NULL;
 685                 }
 686                 if (binding) {
 687                         dev_add_pack(&binding->ptype);
 688                         spin_lock_bh(&g_binding_lock);
 689                         list_add_tail(&binding->link, &g_binding);
 690                         spin_unlock_bh(&g_binding_lock);
 691                 }
 692         }
 693 }
 694
 695 /*
 696  * Context: process
 697  */
 698 static void pd_stop_all_for_device(struct net_device *net_dev)
 699 {
 700         struct list_head h;
 701         struct oz_pd *pd;
 702         struct oz_pd *n;
 703
 704         INIT_LIST_HEAD(&h);
 705         spin_lock_bh(&g_polling_lock);
 706         list_for_each_entry_safe(pd, n, &g_pd_list, link) {
 707                 if (pd->net_dev == net_dev) {
 708                         list_move(&pd->link, &h);
 709                         oz_pd_get(pd);
 710                 }
 711         }
 712         spin_unlock_bh(&g_polling_lock);
 713         while (!list_empty(&h)) {
 714                 pd = list_first_entry(&h, struct oz_pd, link);
 715                 oz_pd_stop(pd);
 716                 oz_pd_put(pd);
 717         }
 718 }
 719
 720 /*
 721  * Context: process
 722  */
 723 void oz_binding_remove(const char *net_dev)
 724 {
 725         struct oz_binding *binding;
 726         int found = 0;
 727
 728         oz_dbg(ON, "Removing binding: %s\n", net_dev);
 729         spin_lock_bh(&g_binding_lock);
 730         list_for_each_entry(binding, &g_binding, link) {
 731                 if (strncmp(binding->name, net_dev, OZ_MAX_BINDING_LEN) == 0) {
 732                         oz_dbg(ON, "Binding '%s' found\n", net_dev);
 733                         found = 1;
 734                         break;
 735                 }
 736         }
 737         spin_unlock_bh(&g_binding_lock);
 738         if (found) {
 739                 dev_remove_pack(&binding->ptype);
 740                 if (binding->ptype.dev) {
 741                         dev_put(binding->ptype.dev);
 742                         pd_stop_all_for_device(binding->ptype.dev);
 743                 }
 744                 list_del(&binding->link);
 745                 kfree(binding);
 746         }
 747 }
 748
 749 /*
 750  * Context: process
 751  */
 752 static char *oz_get_next_device_name(char *s, char *dname, int max_size)
 753 {
 754         while (*s == ',')
 755                 s++;
 756         while (*s && (*s != ',') && max_size > 1) {
 757                 *dname++ = *s++;
 758                 max_size--;
 759         }
 760         *dname = 0;
 761         return s;
 762 }
 763
 764 /*
 765  * Context: process
 766  */
 767 int oz_protocol_init(char *devs)
 768 {
 769         skb_queue_head_init(&g_rx_queue);
 770         if (devs && (devs[0] == '*')) {
 771                 oz_binding_add(NULL);
 772         } else {
 773                 char d[32];
 774                 while (*devs) {
 775                         devs = oz_get_next_device_name(devs, d, sizeof(d));
 776                         if (d[0])
 777                                 oz_binding_add(d);
 778                 }
 779         }
 780         return 0;
 781 }
 782
 783 /*
 784  * Context: process
 785  */
 786 int oz_get_pd_list(struct oz_mac_addr *addr, int max_count)
 787 {
 788         struct oz_pd *pd;
 789         struct list_head *e;
 790         int count = 0;
 791
 792         spin_lock_bh(&g_polling_lock);
 793         list_for_each(e, &g_pd_list) {
 794                 if (count >= max_count)
 795                         break;
 796                 pd = container_of(e, struct oz_pd, link);
 797                 memcpy(&addr[count++], pd->mac_addr, ETH_ALEN);
 798         }
 799         spin_unlock_bh(&g_polling_lock);
 800         return count;
 801 }
 802
 803 void oz_polling_lock_bh(void)
 804 {
 805         spin_lock_bh(&g_polling_lock);
 806 }
 807
 808 void oz_polling_unlock_bh(void)
 809 {
 810         spin_unlock_bh(&g_polling_lock);
 811 }