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/etherdevice.h>
  12 #include <linux/errno.h>
  13 #include <linux/ieee80211.h>
  14 #include <linux/slab.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 struct oz_binding {
  34         struct packet_type ptype;
  35         char name[OZ_MAX_BINDING_LEN];
  36         struct list_head link;
  37 };
  38
  39 /*
  40  * External variable
  41  */
  42
  43 DEFINE_SPINLOCK(g_polling_lock);
  44 /*
  45  * Static external variables.
  46  */
  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 struct kmem_cache *oz_elt_info_cache;
  56 struct kmem_cache *oz_tx_frame_cache;
  57
  58 /*
  59  * Context: softirq-serialized
  60  */
  61 static u8 oz_get_new_session_id(u8 exclude)
  62 {
  63         if (++g_session_id == 0)
  64                 g_session_id = 1;
  65         if (g_session_id == exclude) {
  66                 if (++g_session_id == 0)
  67                         g_session_id = 1;
  68         }
  69         return g_session_id;
  70 }
  71
  72 /*
  73  * Context: softirq-serialized
  74  */
  75 static void oz_send_conn_rsp(struct oz_pd *pd, u8 status)
  76 {
  77         struct sk_buff *skb;
  78         struct net_device *dev = pd->net_dev;
  79         struct oz_hdr *oz_hdr;
  80         struct oz_elt *elt;
  81         struct oz_elt_connect_rsp *body;
  82
  83         int sz = sizeof(struct oz_hdr) + sizeof(struct oz_elt) +
  84                         sizeof(struct oz_elt_connect_rsp);
  85         skb = alloc_skb(sz + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC);
  86         if (skb == NULL)
  87                 return;
  88         skb_reserve(skb, LL_RESERVED_SPACE(dev));
  89         skb_reset_network_header(skb);
  90         oz_hdr = (struct oz_hdr *)skb_put(skb, sz);
  91         elt = (struct oz_elt *)(oz_hdr+1);
  92         body = (struct oz_elt_connect_rsp *)(elt+1);
  93         skb->dev = dev;
  94         skb->protocol = htons(OZ_ETHERTYPE);
  95         /* Fill in device header */
  96         if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr,
  97                         dev->dev_addr, skb->len) < 0) {
  98                 kfree_skb(skb);
  99                 return;
 100         }
 101         oz_hdr->control = (OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT);
 102         oz_hdr->last_pkt_num = 0;
 103         put_unaligned(0, &oz_hdr->pkt_num);
 104         elt->type = OZ_ELT_CONNECT_RSP;
 105         elt->length = sizeof(struct oz_elt_connect_rsp);
 106         memset(body, 0, sizeof(struct oz_elt_connect_rsp));
 107         body->status = status;
 108         if (status == 0) {
 109                 body->mode = pd->mode;
 110                 body->session_id = pd->session_id;
 111                 put_unaligned(cpu_to_le16(pd->total_apps), &body->apps);
 112         }
 113         oz_dbg(ON, "TX: OZ_ELT_CONNECT_RSP %d", status);
 114         dev_queue_xmit(skb);
 115 }
 116
 117 /*
 118  * Context: softirq-serialized
 119  */
 120 static void pd_set_keepalive(struct oz_pd *pd, u8 kalive)
 121 {
 122         unsigned long keep_alive = kalive & OZ_KALIVE_VALUE_MASK;
 123
 124         switch (kalive & OZ_KALIVE_TYPE_MASK) {
 125         case OZ_KALIVE_SPECIAL:
 126                 pd->keep_alive = keep_alive * 1000*60*60*24*20;
 127                 break;
 128         case OZ_KALIVE_SECS:
 129                 pd->keep_alive = keep_alive*1000;
 130                 break;
 131         case OZ_KALIVE_MINS:
 132                 pd->keep_alive = keep_alive*1000*60;
 133                 break;
 134         case OZ_KALIVE_HOURS:
 135                 pd->keep_alive = keep_alive*1000*60*60;
 136                 break;
 137         default:
 138                 pd->keep_alive = 0;
 139         }
 140         oz_dbg(ON, "Keepalive = %lu mSec\n", pd->keep_alive);
 141 }
 142
 143 /*
 144  * Context: softirq-serialized
 145  */
 146 static void pd_set_presleep(struct oz_pd *pd, u8 presleep, u8 start_timer)
 147 {
 148         if (presleep)
 149                 pd->presleep = presleep*100;
 150         else
 151                 pd->presleep = OZ_PRESLEEP_TOUT;
 152         if (start_timer) {
 153                 spin_unlock(&g_polling_lock);
 154                 oz_timer_add(pd, OZ_TIMER_TOUT, pd->presleep);
 155                 spin_lock(&g_polling_lock);
 156         }
 157         oz_dbg(ON, "Presleep time = %lu mSec\n", pd->presleep);
 158 }
 159
 160 /*
 161  * Context: softirq-serialized
 162  */
 163 static struct oz_pd *oz_connect_req(struct oz_pd *cur_pd, struct oz_elt *elt,
 164                         const u8 *pd_addr, struct net_device *net_dev)
 165 {
 166         struct oz_pd *pd;
 167         struct oz_elt_connect_req *body =
 168                         (struct oz_elt_connect_req *)(elt+1);
 169         u8 rsp_status = OZ_STATUS_SUCCESS;
 170         u8 stop_needed = 0;
 171         u16 new_apps = g_apps;
 172         struct net_device *old_net_dev = NULL;
 173         struct oz_pd *free_pd = NULL;
 174
 175         if (cur_pd) {
 176                 pd = cur_pd;
 177                 spin_lock_bh(&g_polling_lock);
 178         } else {
 179                 struct oz_pd *pd2 = NULL;
 180                 struct list_head *e;
 181
 182                 pd = oz_pd_alloc(pd_addr);
 183                 if (pd == NULL)
 184                         return NULL;
 185                 getnstimeofday(&pd->last_rx_timestamp);
 186                 spin_lock_bh(&g_polling_lock);
 187                 list_for_each(e, &g_pd_list) {
 188                         pd2 = list_entry(e, struct oz_pd, link);
 189                         if (ether_addr_equal(pd2->mac_addr, pd_addr)) {
 190                                 free_pd = pd;
 191                                 pd = pd2;
 192                                 break;
 193                         }
 194                 }
 195                 if (pd != pd2)
 196                         list_add_tail(&pd->link, &g_pd_list);
 197         }
 198         if (pd == NULL) {
 199                 spin_unlock_bh(&g_polling_lock);
 200                 return NULL;
 201         }
 202         if (pd->net_dev != net_dev) {
 203                 old_net_dev = pd->net_dev;
 204                 dev_hold(net_dev);
 205                 pd->net_dev = net_dev;
 206         }
 207         oz_dbg(ON, "Host vendor: %d\n", body->host_vendor);
 208         pd->max_tx_size = OZ_MAX_TX_SIZE;
 209         pd->mode = body->mode;
 210         pd->pd_info = body->pd_info;
 211         if (pd->mode & OZ_F_ISOC_NO_ELTS) {
 212                 pd->ms_per_isoc = body->ms_per_isoc;
 213                 if (!pd->ms_per_isoc)
 214                         pd->ms_per_isoc = 4;
 215
 216                 switch (body->ms_isoc_latency & OZ_LATENCY_MASK) {
 217                 case OZ_ONE_MS_LATENCY:
 218                         pd->isoc_latency = (body->ms_isoc_latency &
 219                                         ~OZ_LATENCY_MASK) / pd->ms_per_isoc;
 220                         break;
 221                 case OZ_TEN_MS_LATENCY:
 222                         pd->isoc_latency = ((body->ms_isoc_latency &
 223                                 ~OZ_LATENCY_MASK) * 10) / pd->ms_per_isoc;
 224                         break;
 225                 default:
 226                         pd->isoc_latency = OZ_MAX_TX_QUEUE_ISOC;
 227                 }
 228         }
 229         if (body->max_len_div16)
 230                 pd->max_tx_size = ((u16)body->max_len_div16)<<4;
 231         oz_dbg(ON, "Max frame:%u Ms per isoc:%u\n",
 232                pd->max_tx_size, pd->ms_per_isoc);
 233         pd->max_stream_buffering = 3*1024;
 234         pd->pulse_period = OZ_QUANTUM;
 235         pd_set_presleep(pd, body->presleep, 0);
 236         pd_set_keepalive(pd, body->keep_alive);
 237
 238         new_apps &= le16_to_cpu(get_unaligned(&body->apps));
 239         if ((new_apps & 0x1) && (body->session_id)) {
 240                 if (pd->session_id) {
 241                         if (pd->session_id != body->session_id) {
 242                                 rsp_status = OZ_STATUS_SESSION_MISMATCH;
 243                                 goto done;
 244                         }
 245                 } else {
 246                         new_apps &= ~0x1;  /* Resume not permitted */
 247                         pd->session_id =
 248                                 oz_get_new_session_id(body->session_id);
 249                 }
 250         } else {
 251                 if (pd->session_id && !body->session_id) {
 252                         rsp_status = OZ_STATUS_SESSION_TEARDOWN;
 253                         stop_needed = 1;
 254                 } else {
 255                         new_apps &= ~0x1;  /* Resume not permitted */
 256                         pd->session_id =
 257                                 oz_get_new_session_id(body->session_id);
 258                 }
 259         }
 260 done:
 261         if (rsp_status == OZ_STATUS_SUCCESS) {
 262                 u16 start_apps = new_apps & ~pd->total_apps & ~0x1;
 263                 u16 stop_apps = pd->total_apps & ~new_apps & ~0x1;
 264                 u16 resume_apps = new_apps & pd->paused_apps  & ~0x1;
 265
 266                 spin_unlock_bh(&g_polling_lock);
 267                 oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
 268                 oz_dbg(ON, "new_apps=0x%x total_apps=0x%x paused_apps=0x%x\n",
 269                        new_apps, pd->total_apps, pd->paused_apps);
 270                 if (start_apps) {
 271                         if (oz_services_start(pd, start_apps, 0))
 272                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 273                 }
 274                 if (resume_apps)
 275                         if (oz_services_start(pd, resume_apps, 1))
 276                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 277                 if (stop_apps)
 278                         oz_services_stop(pd, stop_apps, 0);
 279                 oz_pd_request_heartbeat(pd);
 280         } else {
 281                 spin_unlock_bh(&g_polling_lock);
 282         }
 283         oz_send_conn_rsp(pd, rsp_status);
 284         if (rsp_status != OZ_STATUS_SUCCESS) {
 285                 if (stop_needed)
 286                         oz_pd_stop(pd);
 287                 oz_pd_put(pd);
 288                 pd = NULL;
 289         }
 290         if (old_net_dev)
 291                 dev_put(old_net_dev);
 292         if (free_pd)
 293                 oz_pd_destroy(free_pd);
 294         return pd;
 295 }
 296
 297 /*
 298  * Context: softirq-serialized
 299  */
 300 static void oz_add_farewell(struct oz_pd *pd, u8 ep_num, u8 index,
 301                         const u8 *report, u8 len)
 302 {
 303         struct oz_farewell *f;
 304         struct oz_farewell *f2;
 305         int found = 0;
 306
 307         f = kmalloc(sizeof(struct oz_farewell) + len, GFP_ATOMIC);
 308         if (!f)
 309                 return;
 310         f->ep_num = ep_num;
 311         f->index = index;
 312         f->len = len;
 313         memcpy(f->report, report, len);
 314         oz_dbg(ON, "RX: Adding farewell report\n");
 315         spin_lock(&g_polling_lock);
 316         list_for_each_entry(f2, &pd->farewell_list, link) {
 317                 if ((f2->ep_num == ep_num) && (f2->index == index)) {
 318                         found = 1;
 319                         list_del(&f2->link);
 320                         break;
 321                 }
 322         }
 323         list_add_tail(&f->link, &pd->farewell_list);
 324         spin_unlock(&g_polling_lock);
 325         if (found)
 326                 kfree(f2);
 327 }
 328
 329 /*
 330  * Context: softirq-serialized
 331  */
 332 static void oz_rx_frame(struct sk_buff *skb)
 333 {
 334         u8 *mac_hdr;
 335         u8 *src_addr;
 336         struct oz_elt *elt;
 337         int length;
 338         struct oz_pd *pd = NULL;
 339         struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb);
 340         struct timespec current_time;
 341         int dup = 0;
 342         u32 pkt_num;
 343
 344         oz_dbg(RX_FRAMES, "RX frame PN=0x%x LPN=0x%x control=0x%x\n",
 345                oz_hdr->pkt_num, oz_hdr->last_pkt_num, oz_hdr->control);
 346         mac_hdr = skb_mac_header(skb);
 347         src_addr = &mac_hdr[ETH_ALEN];
 348         length = skb->len;
 349
 350         /* Check the version field */
 351         if (oz_get_prot_ver(oz_hdr->control) != OZ_PROTOCOL_VERSION) {
 352                 oz_dbg(ON, "Incorrect protocol version: %d\n",
 353                        oz_get_prot_ver(oz_hdr->control));
 354                 goto done;
 355         }
 356
 357         pkt_num = le32_to_cpu(get_unaligned(&oz_hdr->pkt_num));
 358
 359         pd = oz_pd_find(src_addr);
 360         if (pd) {
 361                 if (!(pd->state & OZ_PD_S_CONNECTED))
 362                         oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
 363                 getnstimeofday(&current_time);
 364                 if ((current_time.tv_sec != pd->last_rx_timestamp.tv_sec) ||
 365                         (pd->presleep < MSEC_PER_SEC))  {
 366                         oz_timer_add(pd, OZ_TIMER_TOUT, pd->presleep);
 367                         pd->last_rx_timestamp = current_time;
 368                 }
 369                 if (pkt_num != pd->last_rx_pkt_num) {
 370                         pd->last_rx_pkt_num = pkt_num;
 371                 } else {
 372                         dup = 1;
 373                         oz_dbg(ON, "Duplicate frame\n");
 374                 }
 375         }
 376
 377         if (pd && !dup && ((pd->mode & OZ_MODE_MASK) == OZ_MODE_TRIGGERED)) {
 378                 oz_dbg(RX_FRAMES, "Received TRIGGER Frame\n");
 379                 pd->last_sent_frame = &pd->tx_queue;
 380                 if (oz_hdr->control & OZ_F_ACK) {
 381                         /* Retire completed frames */
 382                         oz_retire_tx_frames(pd, oz_hdr->last_pkt_num);
 383                 }
 384                 if ((oz_hdr->control & OZ_F_ACK_REQUESTED) &&
 385                                 (pd->state == OZ_PD_S_CONNECTED)) {
 386                         int backlog = pd->nb_queued_frames;
 387
 388                         pd->trigger_pkt_num = pkt_num;
 389                         /* Send queued frames */
 390                         oz_send_queued_frames(pd, backlog);
 391                 }
 392         }
 393
 394         length -= sizeof(struct oz_hdr);
 395         elt = (struct oz_elt *)((u8 *)oz_hdr + sizeof(struct oz_hdr));
 396
 397         while (length >= sizeof(struct oz_elt)) {
 398                 length -= sizeof(struct oz_elt) + elt->length;
 399                 if (length < 0)
 400                         break;
 401                 switch (elt->type) {
 402                 case OZ_ELT_CONNECT_REQ:
 403                         oz_dbg(ON, "RX: OZ_ELT_CONNECT_REQ\n");
 404                         pd = oz_connect_req(pd, elt, src_addr, skb->dev);
 405                         break;
 406                 case OZ_ELT_DISCONNECT:
 407                         oz_dbg(ON, "RX: OZ_ELT_DISCONNECT\n");
 408                         if (pd)
 409                                 oz_pd_sleep(pd);
 410                         break;
 411                 case OZ_ELT_UPDATE_PARAM_REQ: {
 412                                 struct oz_elt_update_param *body =
 413                                         (struct oz_elt_update_param *)(elt + 1);
 414                                 oz_dbg(ON, "RX: OZ_ELT_UPDATE_PARAM_REQ\n");
 415                                 if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 416                                         spin_lock(&g_polling_lock);
 417                                         pd_set_keepalive(pd, body->keepalive);
 418                                         pd_set_presleep(pd, body->presleep, 1);
 419                                         spin_unlock(&g_polling_lock);
 420                                 }
 421                         }
 422                         break;
 423                 case OZ_ELT_FAREWELL_REQ: {
 424                                 struct oz_elt_farewell *body =
 425                                         (struct oz_elt_farewell *)(elt + 1);
 426                                 oz_dbg(ON, "RX: OZ_ELT_FAREWELL_REQ\n");
 427                                 oz_add_farewell(pd, body->ep_num,
 428                                         body->index, body->report,
 429                                         elt->length + 1 - sizeof(*body));
 430                         }
 431                         break;
 432                 case OZ_ELT_APP_DATA:
 433                         if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 434                                 struct oz_app_hdr *app_hdr =
 435                                         (struct oz_app_hdr *)(elt+1);
 436                                 if (dup)
 437                                         break;
 438                                 oz_handle_app_elt(pd, app_hdr->app_id, elt);
 439                         }
 440                         break;
 441                 default:
 442                         oz_dbg(ON, "RX: Unknown elt %02x\n", elt->type);
 443                 }
 444                 elt = oz_next_elt(elt);
 445         }
 446 done:
 447         if (pd)
 448                 oz_pd_put(pd);
 449         consume_skb(skb);
 450 }
 451
 452 /*
 453  * Context: process
 454  */
 455 void oz_protocol_term(void)
 456 {
 457         struct oz_binding *b, *t;
 458
 459         /* Walk the list of bindings and remove each one.
 460          */
 461         spin_lock_bh(&g_binding_lock);
 462         list_for_each_entry_safe(b, t, &g_binding, link) {
 463                 list_del(&b->link);
 464                 spin_unlock_bh(&g_binding_lock);
 465                 dev_remove_pack(&b->ptype);
 466                 if (b->ptype.dev)
 467                         dev_put(b->ptype.dev);
 468                 kfree(b);
 469                 spin_lock_bh(&g_binding_lock);
 470         }
 471         spin_unlock_bh(&g_binding_lock);
 472         /* Walk the list of PDs and stop each one. This causes the PD to be
 473          * removed from the list so we can just pull each one from the head
 474          * of the list.
 475          */
 476         spin_lock_bh(&g_polling_lock);
 477         while (!list_empty(&g_pd_list)) {
 478                 struct oz_pd *pd =
 479                         list_first_entry(&g_pd_list, struct oz_pd, link);
 480                 oz_pd_get(pd);
 481                 spin_unlock_bh(&g_polling_lock);
 482                 oz_pd_stop(pd);
 483                 oz_pd_put(pd);
 484                 spin_lock_bh(&g_polling_lock);
 485         }
 486         spin_unlock_bh(&g_polling_lock);
 487         oz_dbg(ON, "Protocol stopped\n");
 488
 489         kmem_cache_destroy(oz_tx_frame_cache);
 490         kmem_cache_destroy(oz_elt_info_cache);
 491 }
 492
 493 /*
 494  * Context: softirq
 495  */
 496 void oz_pd_heartbeat_handler(unsigned long data)
 497 {
 498         struct oz_pd *pd = (struct oz_pd *)data;
 499         u16 apps = 0;
 500
 501         spin_lock_bh(&g_polling_lock);
 502         if (pd->state & OZ_PD_S_CONNECTED)
 503                 apps = pd->total_apps;
 504         spin_unlock_bh(&g_polling_lock);
 505         if (apps)
 506                 oz_pd_heartbeat(pd, apps);
 507         oz_pd_put(pd);
 508 }
 509
 510 /*
 511  * Context: softirq
 512  */
 513 void oz_pd_timeout_handler(unsigned long data)
 514 {
 515         int type;
 516         struct oz_pd *pd = (struct oz_pd *)data;
 517
 518         spin_lock_bh(&g_polling_lock);
 519         type = pd->timeout_type;
 520         spin_unlock_bh(&g_polling_lock);
 521         switch (type) {
 522         case OZ_TIMER_TOUT:
 523                 oz_pd_sleep(pd);
 524                 break;
 525         case OZ_TIMER_STOP:
 526                 oz_pd_stop(pd);
 527                 break;
 528         }
 529         oz_pd_put(pd);
 530 }
 531
 532 /*
 533  * Context: Interrupt
 534  */
 535 enum hrtimer_restart oz_pd_heartbeat_event(struct hrtimer *timer)
 536 {
 537         struct oz_pd *pd;
 538
 539         pd = container_of(timer, struct oz_pd, heartbeat);
 540         hrtimer_forward_now(timer, ktime_set(pd->pulse_period /
 541         MSEC_PER_SEC, (pd->pulse_period % MSEC_PER_SEC) * NSEC_PER_MSEC));
 542         oz_pd_get(pd);
 543         tasklet_schedule(&pd->heartbeat_tasklet);
 544         return HRTIMER_RESTART;
 545 }
 546
 547 /*
 548  * Context: Interrupt
 549  */
 550 enum hrtimer_restart oz_pd_timeout_event(struct hrtimer *timer)
 551 {
 552         struct oz_pd *pd;
 553
 554         pd = container_of(timer, struct oz_pd, timeout);
 555         oz_pd_get(pd);
 556         tasklet_schedule(&pd->timeout_tasklet);
 557         return HRTIMER_NORESTART;
 558 }
 559
 560 /*
 561  * Context: softirq or process
 562  */
 563 void oz_timer_add(struct oz_pd *pd, int type, unsigned long due_time)
 564 {
 565         spin_lock_bh(&g_polling_lock);
 566         switch (type) {
 567         case OZ_TIMER_TOUT:
 568         case OZ_TIMER_STOP:
 569                 if (hrtimer_active(&pd->timeout)) {
 570                         hrtimer_set_expires(&pd->timeout, ktime_set(due_time /
 571                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 572                                                         NSEC_PER_MSEC));
 573                         hrtimer_start_expires(&pd->timeout, HRTIMER_MODE_REL);
 574                 } else {
 575                         hrtimer_start(&pd->timeout, ktime_set(due_time /
 576                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 577                                         NSEC_PER_MSEC), HRTIMER_MODE_REL);
 578                 }
 579                 pd->timeout_type = type;
 580                 break;
 581         case OZ_TIMER_HEARTBEAT:
 582                 if (!hrtimer_active(&pd->heartbeat))
 583                         hrtimer_start(&pd->heartbeat, ktime_set(due_time /
 584                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 585                                         NSEC_PER_MSEC), HRTIMER_MODE_REL);
 586                 break;
 587         }
 588         spin_unlock_bh(&g_polling_lock);
 589 }
 590
 591 /*
 592  * Context: softirq or process
 593  */
 594 void oz_pd_request_heartbeat(struct oz_pd *pd)
 595 {
 596         oz_timer_add(pd, OZ_TIMER_HEARTBEAT, pd->pulse_period > 0 ?
 597                                         pd->pulse_period : OZ_QUANTUM);
 598 }
 599
 600 /*
 601  * Context: softirq or process
 602  */
 603 struct oz_pd *oz_pd_find(const u8 *mac_addr)
 604 {
 605         struct oz_pd *pd;
 606
 607         spin_lock_bh(&g_polling_lock);
 608         list_for_each_entry(pd, &g_pd_list, link) {
 609                 if (ether_addr_equal(pd->mac_addr, mac_addr)) {
 610                         oz_pd_get(pd);
 611                         spin_unlock_bh(&g_polling_lock);
 612                         return pd;
 613                 }
 614         }
 615         spin_unlock_bh(&g_polling_lock);
 616         return NULL;
 617 }
 618
 619 /*
 620  * Context: process
 621  */
 622 void oz_app_enable(int app_id, int enable)
 623 {
 624         if (app_id < OZ_NB_APPS) {
 625                 spin_lock_bh(&g_polling_lock);
 626                 if (enable)
 627                         g_apps |= (1<<app_id);
 628                 else
 629                         g_apps &= ~(1<<app_id);
 630                 spin_unlock_bh(&g_polling_lock);
 631         }
 632 }
 633
 634 /*
 635  * Context: softirq
 636  */
 637 static int oz_pkt_recv(struct sk_buff *skb, struct net_device *dev,
 638                 struct packet_type *pt, struct net_device *orig_dev)
 639 {
 640         skb = skb_share_check(skb, GFP_ATOMIC);
 641         if (skb == NULL)
 642                 return 0;
 643         spin_lock_bh(&g_rx_queue.lock);
 644         if (g_processing_rx) {
 645                 /* We already hold the lock so use __ variant.
 646                  */
 647                 __skb_queue_head(&g_rx_queue, skb);
 648                 spin_unlock_bh(&g_rx_queue.lock);
 649         } else {
 650                 g_processing_rx = 1;
 651                 do {
 652
 653                         spin_unlock_bh(&g_rx_queue.lock);
 654                         oz_rx_frame(skb);
 655                         spin_lock_bh(&g_rx_queue.lock);
 656                         if (skb_queue_empty(&g_rx_queue)) {
 657                                 g_processing_rx = 0;
 658                                 spin_unlock_bh(&g_rx_queue.lock);
 659                                 break;
 660                         }
 661                         /* We already hold the lock so use __ variant.
 662                          */
 663                         skb = __skb_dequeue(&g_rx_queue);
 664                 } while (1);
 665         }
 666         return 0;
 667 }
 668
 669 /*
 670  * Context: process
 671  */
 672 void oz_binding_add(const char *net_dev)
 673 {
 674         struct oz_binding *binding;
 675
 676         binding = kzalloc(sizeof(struct oz_binding), GFP_KERNEL);
 677         if (!binding)
 678                 return;
 679
 680         binding->ptype.type = htons(OZ_ETHERTYPE);
 681         binding->ptype.func = oz_pkt_recv;
 682         if (net_dev && *net_dev) {
 683                 memcpy(binding->name, net_dev, OZ_MAX_BINDING_LEN);
 684                 oz_dbg(ON, "Adding binding: %s\n", net_dev);
 685                 binding->ptype.dev = dev_get_by_name(&init_net, net_dev);
 686                 if (binding->ptype.dev == NULL) {
 687                         oz_dbg(ON, "Netdev %s not found\n", net_dev);
 688                         kfree(binding);
 689                         return;
 690                 }
 691         }
 692         dev_add_pack(&binding->ptype);
 693         spin_lock_bh(&g_binding_lock);
 694         list_add_tail(&binding->link, &g_binding);
 695         spin_unlock_bh(&g_binding_lock);
 696 }
 697
 698 /*
 699  * Context: process
 700  */
 701 static void pd_stop_all_for_device(struct net_device *net_dev)
 702 {
 703         LIST_HEAD(h);
 704         struct oz_pd *pd;
 705         struct oz_pd *n;
 706
 707         spin_lock_bh(&g_polling_lock);
 708         list_for_each_entry_safe(pd, n, &g_pd_list, link) {
 709                 if (pd->net_dev == net_dev) {
 710                         list_move(&pd->link, &h);
 711                         oz_pd_get(pd);
 712                 }
 713         }
 714         spin_unlock_bh(&g_polling_lock);
 715         while (!list_empty(&h)) {
 716                 pd = list_first_entry(&h, struct oz_pd, link);
 717                 oz_pd_stop(pd);
 718                 oz_pd_put(pd);
 719         }
 720 }
 721
 722 /*
 723  * Context: process
 724  */
 725 void oz_binding_remove(const char *net_dev)
 726 {
 727         struct oz_binding *binding;
 728         int found = 0;
 729
 730         oz_dbg(ON, "Removing binding: %s\n", net_dev);
 731         spin_lock_bh(&g_binding_lock);
 732         list_for_each_entry(binding, &g_binding, link) {
 733                 if (strncmp(binding->name, net_dev, OZ_MAX_BINDING_LEN) == 0) {
 734                         oz_dbg(ON, "Binding '%s' found\n", net_dev);
 735                         found = 1;
 736                         break;
 737                 }
 738         }
 739         spin_unlock_bh(&g_binding_lock);
 740         if (found) {
 741                 dev_remove_pack(&binding->ptype);
 742                 if (binding->ptype.dev) {
 743                         dev_put(binding->ptype.dev);
 744                         pd_stop_all_for_device(binding->ptype.dev);
 745                 }
 746                 list_del(&binding->link);
 747                 kfree(binding);
 748         }
 749 }
 750
 751 /*
 752  * Context: process
 753  */
 754 static char *oz_get_next_device_name(char *s, char *dname, int max_size)
 755 {
 756         while (*s == ',')
 757                 s++;
 758         while (*s && (*s != ',') && max_size > 1) {
 759                 *dname++ = *s++;
 760                 max_size--;
 761         }
 762         *dname = 0;
 763         return s;
 764 }
 765
 766 /*
 767  * Context: process
 768  */
 769 int oz_protocol_init(char *devs)
 770 {
 771         oz_elt_info_cache = KMEM_CACHE(oz_elt_info, 0);
 772         if (!oz_elt_info_cache)
 773                 return -ENOMEM;
 774
 775         oz_tx_frame_cache = KMEM_CACHE(oz_tx_frame, 0);
 776         if (!oz_tx_frame_cache) {
 777                 kmem_cache_destroy(oz_elt_info_cache);
 778                 return -ENOMEM;
 779         }
 780
 781         skb_queue_head_init(&g_rx_queue);
 782         if (devs[0] == '*') {
 783                 oz_binding_add(NULL);
 784         } else {
 785                 char d[32];
 786
 787                 while (*devs) {
 788                         devs = oz_get_next_device_name(devs, d, sizeof(d));
 789                         if (d[0])
 790                                 oz_binding_add(d);
 791                 }
 792         }
 793         return 0;
 794 }
 795
 796 /*
 797  * Context: process
 798  */
 799 int oz_get_pd_list(struct oz_mac_addr *addr, int max_count)
 800 {
 801         struct oz_pd *pd;
 802         int count = 0;
 803
 804         spin_lock_bh(&g_polling_lock);
 805         list_for_each_entry(pd, &g_pd_list, link) {
 806                 if (count >= max_count)
 807                         break;
 808                 ether_addr_copy((u8 *)&addr[count++], pd->mac_addr);
 809         }
 810         spin_unlock_bh(&g_polling_lock);
 811         return count;
 812 }
 813