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 "ozdbg.h"
  15 #include "ozprotocol.h"
  16 #include "ozeltbuf.h"
  17 #include "ozpd.h"
  18 #include "ozproto.h"
  19 #include "ozusbsvc.h"
  20
  21 #include "ozappif.h"
  22 #include <asm/unaligned.h>
  23 #include <linux/uaccess.h>
  24 #include <net/psnap.h>
  25
  26 #define OZ_CF_CONN_SUCCESS      1
  27 #define OZ_CF_CONN_FAILURE      2
  28
  29 #define OZ_DO_STOP              1
  30 #define OZ_DO_SLEEP             2
  31
  32 #define OZ_MAX_TIMER_POOL_SIZE  16
  33
  34 struct oz_binding {
  35         struct packet_type ptype;
  36         char name[OZ_MAX_BINDING_LEN];
  37         struct list_head link;
  38 };
  39
  40 /*
  41  * External variable
  42  */
  43
  44 DEFINE_SPINLOCK(g_polling_lock);
  45 /*
  46  * Static external variables.
  47  */
  48 static LIST_HEAD(g_pd_list);
  49 static LIST_HEAD(g_binding);
  50 static DEFINE_SPINLOCK(g_binding_lock);
  51 static struct sk_buff_head g_rx_queue;
  52 static u8 g_session_id;
  53 static u16 g_apps = 0x1;
  54 static int g_processing_rx;
  55
  56 /*
  57  * Context: softirq-serialized
  58  */
  59 static u8 oz_get_new_session_id(u8 exclude)
  60 {
  61         if (++g_session_id == 0)
  62                 g_session_id = 1;
  63         if (g_session_id == exclude) {
  64                 if (++g_session_id == 0)
  65                         g_session_id = 1;
  66         }
  67         return g_session_id;
  68 }
  69
  70 /*
  71  * Context: softirq-serialized
  72  */
  73 static void oz_send_conn_rsp(struct oz_pd *pd, u8 status)
  74 {
  75         struct sk_buff *skb;
  76         struct net_device *dev = pd->net_dev;
  77         struct oz_hdr *oz_hdr;
  78         struct oz_elt *elt;
  79         struct oz_elt_connect_rsp *body;
  80
  81         int sz = sizeof(struct oz_hdr) + sizeof(struct oz_elt) +
  82                         sizeof(struct oz_elt_connect_rsp);
  83         skb = alloc_skb(sz + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC);
  84         if (skb == NULL)
  85                 return;
  86         skb_reserve(skb, LL_RESERVED_SPACE(dev));
  87         skb_reset_network_header(skb);
  88         oz_hdr = (struct oz_hdr *)skb_put(skb, sz);
  89         elt = (struct oz_elt *)(oz_hdr+1);
  90         body = (struct oz_elt_connect_rsp *)(elt+1);
  91         skb->dev = dev;
  92         skb->protocol = htons(OZ_ETHERTYPE);
  93         /* Fill in device header */
  94         if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr,
  95                         dev->dev_addr, skb->len) < 0) {
  96                 kfree_skb(skb);
  97                 return;
  98         }
  99         oz_hdr->control = (OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT);
 100         oz_hdr->last_pkt_num = 0;
 101         put_unaligned(0, &oz_hdr->pkt_num);
 102         elt->type = OZ_ELT_CONNECT_RSP;
 103         elt->length = sizeof(struct oz_elt_connect_rsp);
 104         memset(body, 0, sizeof(struct oz_elt_connect_rsp));
 105         body->status = status;
 106         if (status == 0) {
 107                 body->mode = pd->mode;
 108                 body->session_id = pd->session_id;
 109                 put_unaligned(cpu_to_le16(pd->total_apps), &body->apps);
 110         }
 111         oz_dbg(ON, "TX: OZ_ELT_CONNECT_RSP %d", status);
 112         dev_queue_xmit(skb);
 113         return;
 114 }
 115
 116 /*
 117  * Context: softirq-serialized
 118  */
 119 static void pd_set_keepalive(struct oz_pd *pd, u8 kalive)
 120 {
 121         unsigned long keep_alive = kalive & OZ_KALIVE_VALUE_MASK;
 122
 123         switch (kalive & OZ_KALIVE_TYPE_MASK) {
 124         case OZ_KALIVE_SPECIAL:
 125                 pd->keep_alive = keep_alive * 1000*60*60*24*20;
 126                 break;
 127         case OZ_KALIVE_SECS:
 128                 pd->keep_alive = keep_alive*1000;
 129                 break;
 130         case OZ_KALIVE_MINS:
 131                 pd->keep_alive = keep_alive*1000*60;
 132                 break;
 133         case OZ_KALIVE_HOURS:
 134                 pd->keep_alive = keep_alive*1000*60*60;
 135                 break;
 136         default:
 137                 pd->keep_alive = 0;
 138         }
 139         oz_dbg(ON, "Keepalive = %lu mSec\n", pd->keep_alive);
 140 }
 141
 142 /*
 143  * Context: softirq-serialized
 144  */
 145 static void pd_set_presleep(struct oz_pd *pd, u8 presleep, u8 start_timer)
 146 {
 147         if (presleep)
 148                 pd->presleep = presleep*100;
 149         else
 150                 pd->presleep = OZ_PRESLEEP_TOUT;
 151         if (start_timer) {
 152                 spin_unlock(&g_polling_lock);
 153                 oz_timer_add(pd, OZ_TIMER_TOUT, pd->presleep);
 154                 spin_lock(&g_polling_lock);
 155         }
 156         oz_dbg(ON, "Presleep time = %lu mSec\n", pd->presleep);
 157 }
 158
 159 /*
 160  * Context: softirq-serialized
 161  */
 162 static struct oz_pd *oz_connect_req(struct oz_pd *cur_pd, struct oz_elt *elt,
 163                         const u8 *pd_addr, struct net_device *net_dev)
 164 {
 165         struct oz_pd *pd;
 166         struct oz_elt_connect_req *body =
 167                         (struct oz_elt_connect_req *)(elt+1);
 168         u8 rsp_status = OZ_STATUS_SUCCESS;
 169         u8 stop_needed = 0;
 170         u16 new_apps = g_apps;
 171         struct net_device *old_net_dev = NULL;
 172         struct oz_pd *free_pd = NULL;
 173
 174         if (cur_pd) {
 175                 pd = cur_pd;
 176                 spin_lock_bh(&g_polling_lock);
 177         } else {
 178                 struct oz_pd *pd2 = NULL;
 179                 struct list_head *e;
 180                 pd = oz_pd_alloc(pd_addr);
 181                 if (pd == NULL)
 182                         return NULL;
 183                 getnstimeofday(&pd->last_rx_timestamp);
 184                 spin_lock_bh(&g_polling_lock);
 185                 list_for_each(e, &g_pd_list) {
 186                         pd2 = container_of(e, struct oz_pd, link);
 187                         if (ether_addr_equal(pd2->mac_addr, pd_addr)) {
 188                                 free_pd = pd;
 189                                 pd = pd2;
 190                                 break;
 191                         }
 192                 }
 193                 if (pd != pd2)
 194                         list_add_tail(&pd->link, &g_pd_list);
 195         }
 196         if (pd == NULL) {
 197                 spin_unlock_bh(&g_polling_lock);
 198                 return NULL;
 199         }
 200         if (pd->net_dev != net_dev) {
 201                 old_net_dev = pd->net_dev;
 202                 dev_hold(net_dev);
 203                 pd->net_dev = net_dev;
 204         }
 205         oz_dbg(ON, "Host vendor: %d\n", body->host_vendor);
 206         pd->max_tx_size = OZ_MAX_TX_SIZE;
 207         pd->mode = body->mode;
 208         pd->pd_info = body->pd_info;
 209         if (pd->mode & OZ_F_ISOC_NO_ELTS) {
 210                 pd->ms_per_isoc = body->ms_per_isoc;
 211                 if (!pd->ms_per_isoc)
 212                         pd->ms_per_isoc = 4;
 213
 214                 switch (body->ms_isoc_latency & OZ_LATENCY_MASK) {
 215                 case OZ_ONE_MS_LATENCY:
 216                         pd->isoc_latency = (body->ms_isoc_latency &
 217                                         ~OZ_LATENCY_MASK) / pd->ms_per_isoc;
 218                         break;
 219                 case OZ_TEN_MS_LATENCY:
 220                         pd->isoc_latency = ((body->ms_isoc_latency &
 221                                 ~OZ_LATENCY_MASK) * 10) / pd->ms_per_isoc;
 222                         break;
 223                 default:
 224                         pd->isoc_latency = OZ_MAX_TX_QUEUE_ISOC;
 225                 }
 226         }
 227         if (body->max_len_div16)
 228                 pd->max_tx_size = ((u16)body->max_len_div16)<<4;
 229         oz_dbg(ON, "Max frame:%u Ms per isoc:%u\n",
 230                pd->max_tx_size, pd->ms_per_isoc);
 231         pd->max_stream_buffering = 3*1024;
 232         pd->pulse_period = OZ_QUANTUM;
 233         pd_set_presleep(pd, body->presleep, 0);
 234         pd_set_keepalive(pd, body->keep_alive);
 235
 236         new_apps &= le16_to_cpu(get_unaligned(&body->apps));
 237         if ((new_apps & 0x1) && (body->session_id)) {
 238                 if (pd->session_id) {
 239                         if (pd->session_id != body->session_id) {
 240                                 rsp_status = OZ_STATUS_SESSION_MISMATCH;
 241                                 goto done;
 242                         }
 243                 } else {
 244                         new_apps &= ~0x1;  /* Resume not permitted */
 245                         pd->session_id =
 246                                 oz_get_new_session_id(body->session_id);
 247                 }
 248         } else {
 249                 if (pd->session_id && !body->session_id) {
 250                         rsp_status = OZ_STATUS_SESSION_TEARDOWN;
 251                         stop_needed = 1;
 252                 } else {
 253                         new_apps &= ~0x1;  /* Resume not permitted */
 254                         pd->session_id =
 255                                 oz_get_new_session_id(body->session_id);
 256                 }
 257         }
 258 done:
 259         if (rsp_status == OZ_STATUS_SUCCESS) {
 260                 u16 start_apps = new_apps & ~pd->total_apps & ~0x1;
 261                 u16 stop_apps = pd->total_apps & ~new_apps & ~0x1;
 262                 u16 resume_apps = new_apps & pd->paused_apps  & ~0x1;
 263                 spin_unlock_bh(&g_polling_lock);
 264                 oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
 265                 oz_dbg(ON, "new_apps=0x%x total_apps=0x%x paused_apps=0x%x\n",
 266                        new_apps, pd->total_apps, pd->paused_apps);
 267                 if (start_apps) {
 268                         if (oz_services_start(pd, start_apps, 0))
 269                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 270                 }
 271                 if (resume_apps)
 272                         if (oz_services_start(pd, resume_apps, 1))
 273                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 274                 if (stop_apps)
 275                         oz_services_stop(pd, stop_apps, 0);
 276                 oz_pd_request_heartbeat(pd);
 277         } else {
 278                 spin_unlock_bh(&g_polling_lock);
 279         }
 280         oz_send_conn_rsp(pd, rsp_status);
 281         if (rsp_status != OZ_STATUS_SUCCESS) {
 282                 if (stop_needed)
 283                         oz_pd_stop(pd);
 284                 oz_pd_put(pd);
 285                 pd = NULL;
 286         }
 287         if (old_net_dev)
 288                 dev_put(old_net_dev);
 289         if (free_pd)
 290                 oz_pd_destroy(free_pd);
 291         return pd;
 292 }
 293
 294 /*
 295  * Context: softirq-serialized
 296  */
 297 static void oz_add_farewell(struct oz_pd *pd, u8 ep_num, u8 index,
 298                         const u8 *report, u8 len)
 299 {
 300         struct oz_farewell *f;
 301         struct oz_farewell *f2;
 302         int found = 0;
 303
 304         f = kmalloc(sizeof(struct oz_farewell) + len, GFP_ATOMIC);
 305         if (!f)
 306                 return;
 307         f->ep_num = ep_num;
 308         f->index = index;
 309         f->len = len;
 310         memcpy(f->report, report, len);
 311         oz_dbg(ON, "RX: Adding farewell report\n");
 312         spin_lock(&g_polling_lock);
 313         list_for_each_entry(f2, &pd->farewell_list, link) {
 314                 if ((f2->ep_num == ep_num) && (f2->index == index)) {
 315                         found = 1;
 316                         list_del(&f2->link);
 317                         break;
 318                 }
 319         }
 320         list_add_tail(&f->link, &pd->farewell_list);
 321         spin_unlock(&g_polling_lock);
 322         if (found)
 323                 kfree(f2);
 324 }
 325
 326 /*
 327  * Context: softirq-serialized
 328  */
 329 static void oz_rx_frame(struct sk_buff *skb)
 330 {
 331         u8 *mac_hdr;
 332         u8 *src_addr;
 333         struct oz_elt *elt;
 334         int length;
 335         struct oz_pd *pd = NULL;
 336         struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb);
 337         struct timespec current_time;
 338         int dup = 0;
 339         u32 pkt_num;
 340
 341         oz_dbg(RX_FRAMES, "RX frame PN=0x%x LPN=0x%x control=0x%x\n",
 342                oz_hdr->pkt_num, oz_hdr->last_pkt_num, oz_hdr->control);
 343         mac_hdr = skb_mac_header(skb);
 344         src_addr = &mac_hdr[ETH_ALEN];
 345         length = skb->len;
 346
 347         /* Check the version field */
 348         if (oz_get_prot_ver(oz_hdr->control) != OZ_PROTOCOL_VERSION) {
 349                 oz_dbg(ON, "Incorrect protocol version: %d\n",
 350                        oz_get_prot_ver(oz_hdr->control));
 351                 goto done;
 352         }
 353
 354         pkt_num = le32_to_cpu(get_unaligned(&oz_hdr->pkt_num));
 355
 356         pd = oz_pd_find(src_addr);
 357         if (pd) {
 358                 if (!(pd->state & OZ_PD_S_CONNECTED))
 359                         oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
 360                 getnstimeofday(&current_time);
 361                 if ((current_time.tv_sec != pd->last_rx_timestamp.tv_sec) ||
 362                         (pd->presleep < MSEC_PER_SEC))  {
 363                         oz_timer_add(pd, OZ_TIMER_TOUT, pd->presleep);
 364                         pd->last_rx_timestamp = current_time;
 365                 }
 366                 if (pkt_num != pd->last_rx_pkt_num) {
 367                         pd->last_rx_pkt_num = pkt_num;
 368                 } else {
 369                         dup = 1;
 370                         oz_dbg(ON, "Duplicate frame\n");
 371                 }
 372         }
 373
 374         if (pd && !dup && ((pd->mode & OZ_MODE_MASK) == OZ_MODE_TRIGGERED)) {
 375                 oz_dbg(RX_FRAMES, "Received TRIGGER Frame\n");
 376                 pd->last_sent_frame = &pd->tx_queue;
 377                 if (oz_hdr->control & OZ_F_ACK) {
 378                         /* Retire completed frames */
 379                         oz_retire_tx_frames(pd, oz_hdr->last_pkt_num);
 380                 }
 381                 if ((oz_hdr->control & OZ_F_ACK_REQUESTED) &&
 382                                 (pd->state == OZ_PD_S_CONNECTED)) {
 383                         int backlog = pd->nb_queued_frames;
 384                         pd->trigger_pkt_num = pkt_num;
 385                         /* Send queued frames */
 386                         oz_send_queued_frames(pd, backlog);
 387                 }
 388         }
 389
 390         length -= sizeof(struct oz_hdr);
 391         elt = (struct oz_elt *)((u8 *)oz_hdr + sizeof(struct oz_hdr));
 392
 393         while (length >= sizeof(struct oz_elt)) {
 394                 length -= sizeof(struct oz_elt) + elt->length;
 395                 if (length < 0)
 396                         break;
 397                 switch (elt->type) {
 398                 case OZ_ELT_CONNECT_REQ:
 399                         oz_dbg(ON, "RX: OZ_ELT_CONNECT_REQ\n");
 400                         pd = oz_connect_req(pd, elt, src_addr, skb->dev);
 401                         break;
 402                 case OZ_ELT_DISCONNECT:
 403                         oz_dbg(ON, "RX: OZ_ELT_DISCONNECT\n");
 404                         if (pd)
 405                                 oz_pd_sleep(pd);
 406                         break;
 407                 case OZ_ELT_UPDATE_PARAM_REQ: {
 408                                 struct oz_elt_update_param *body =
 409                                         (struct oz_elt_update_param *)(elt + 1);
 410                                 oz_dbg(ON, "RX: OZ_ELT_UPDATE_PARAM_REQ\n");
 411                                 if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 412                                         spin_lock(&g_polling_lock);
 413                                         pd_set_keepalive(pd, body->keepalive);
 414                                         pd_set_presleep(pd, body->presleep, 1);
 415                                         spin_unlock(&g_polling_lock);
 416                                 }
 417                         }
 418                         break;
 419                 case OZ_ELT_FAREWELL_REQ: {
 420                                 struct oz_elt_farewell *body =
 421                                         (struct oz_elt_farewell *)(elt + 1);
 422                                 oz_dbg(ON, "RX: OZ_ELT_FAREWELL_REQ\n");
 423                                 oz_add_farewell(pd, body->ep_num,
 424                                         body->index, body->report,
 425                                         elt->length + 1 - sizeof(*body));
 426                         }
 427                         break;
 428                 case OZ_ELT_APP_DATA:
 429                         if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 430                                 struct oz_app_hdr *app_hdr =
 431                                         (struct oz_app_hdr *)(elt+1);
 432                                 if (dup)
 433                                         break;
 434                                 oz_handle_app_elt(pd, app_hdr->app_id, elt);
 435                         }
 436                         break;
 437                 default:
 438                         oz_dbg(ON, "RX: Unknown elt %02x\n", elt->type);
 439                 }
 440                 elt = oz_next_elt(elt);
 441         }
 442 done:
 443         if (pd)
 444                 oz_pd_put(pd);
 445         consume_skb(skb);
 446 }
 447
 448 /*
 449  * Context: process
 450  */
 451 void oz_protocol_term(void)
 452 {
 453         struct oz_binding *b, *t;
 454
 455         /* Walk the list of bindings and remove each one.
 456          */
 457         spin_lock_bh(&g_binding_lock);
 458         list_for_each_entry_safe(b, t, &g_binding, link) {
 459                 list_del(&b->link);
 460                 spin_unlock_bh(&g_binding_lock);
 461                 dev_remove_pack(&b->ptype);
 462                 if (b->ptype.dev)
 463                         dev_put(b->ptype.dev);
 464                 kfree(b);
 465                 spin_lock_bh(&g_binding_lock);
 466         }
 467         spin_unlock_bh(&g_binding_lock);
 468         /* Walk the list of PDs and stop each one. This causes the PD to be
 469          * removed from the list so we can just pull each one from the head
 470          * of the list.
 471          */
 472         spin_lock_bh(&g_polling_lock);
 473         while (!list_empty(&g_pd_list)) {
 474                 struct oz_pd *pd =
 475                         list_first_entry(&g_pd_list, struct oz_pd, link);
 476                 oz_pd_get(pd);
 477                 spin_unlock_bh(&g_polling_lock);
 478                 oz_pd_stop(pd);
 479                 oz_pd_put(pd);
 480                 spin_lock_bh(&g_polling_lock);
 481         }
 482         spin_unlock_bh(&g_polling_lock);
 483         oz_dbg(ON, "Protocol stopped\n");
 484 }
 485
 486 /*
 487  * Context: softirq
 488  */
 489 void oz_pd_heartbeat_handler(unsigned long data)
 490 {
 491         struct oz_pd *pd = (struct oz_pd *)data;
 492         u16 apps = 0;
 493
 494         spin_lock_bh(&g_polling_lock);
 495         if (pd->state & OZ_PD_S_CONNECTED)
 496                 apps = pd->total_apps;
 497         spin_unlock_bh(&g_polling_lock);
 498         if (apps)
 499                 oz_pd_heartbeat(pd, apps);
 500         oz_pd_put(pd);
 501 }
 502
 503 /*
 504  * Context: softirq
 505  */
 506 void oz_pd_timeout_handler(unsigned long data)
 507 {
 508         int type;
 509         struct oz_pd *pd = (struct oz_pd *)data;
 510
 511         spin_lock_bh(&g_polling_lock);
 512         type = pd->timeout_type;
 513         spin_unlock_bh(&g_polling_lock);
 514         switch (type) {
 515         case OZ_TIMER_TOUT:
 516                 oz_pd_sleep(pd);
 517                 break;
 518         case OZ_TIMER_STOP:
 519                 oz_pd_stop(pd);
 520                 break;
 521         }
 522         oz_pd_put(pd);
 523 }
 524
 525 /*
 526  * Context: Interrupt
 527  */
 528 enum hrtimer_restart oz_pd_heartbeat_event(struct hrtimer *timer)
 529 {
 530         struct oz_pd *pd;
 531
 532         pd = container_of(timer, struct oz_pd, heartbeat);
 533         hrtimer_forward_now(timer, ktime_set(pd->pulse_period /
 534         MSEC_PER_SEC, (pd->pulse_period % MSEC_PER_SEC) * NSEC_PER_MSEC));
 535         oz_pd_get(pd);
 536         tasklet_schedule(&pd->heartbeat_tasklet);
 537         return HRTIMER_RESTART;
 538 }
 539
 540 /*
 541  * Context: Interrupt
 542  */
 543 enum hrtimer_restart oz_pd_timeout_event(struct hrtimer *timer)
 544 {
 545         struct oz_pd *pd;
 546
 547         pd = container_of(timer, struct oz_pd, timeout);
 548         oz_pd_get(pd);
 549         tasklet_schedule(&pd->timeout_tasklet);
 550         return HRTIMER_NORESTART;
 551 }
 552
 553 /*
 554  * Context: softirq or process
 555  */
 556 void oz_timer_add(struct oz_pd *pd, int type, unsigned long due_time)
 557 {
 558         spin_lock_bh(&g_polling_lock);
 559         switch (type) {
 560         case OZ_TIMER_TOUT:
 561         case OZ_TIMER_STOP:
 562                 if (hrtimer_active(&pd->timeout)) {
 563                         hrtimer_set_expires(&pd->timeout, ktime_set(due_time /
 564                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 565                                                         NSEC_PER_MSEC));
 566                         hrtimer_start_expires(&pd->timeout, HRTIMER_MODE_REL);
 567                 } else {
 568                         hrtimer_start(&pd->timeout, ktime_set(due_time /
 569                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 570                                         NSEC_PER_MSEC), HRTIMER_MODE_REL);
 571                 }
 572                 pd->timeout_type = type;
 573                 break;
 574         case OZ_TIMER_HEARTBEAT:
 575                 if (!hrtimer_active(&pd->heartbeat))
 576                         hrtimer_start(&pd->heartbeat, ktime_set(due_time /
 577                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 578                                         NSEC_PER_MSEC), HRTIMER_MODE_REL);
 579                 break;
 580         }
 581         spin_unlock_bh(&g_polling_lock);
 582 }
 583
 584 /*
 585  * Context: softirq or process
 586  */
 587 void oz_pd_request_heartbeat(struct oz_pd *pd)
 588 {
 589         oz_timer_add(pd, OZ_TIMER_HEARTBEAT, pd->pulse_period > 0 ?
 590                                         pd->pulse_period : OZ_QUANTUM);
 591 }
 592
 593 /*
 594  * Context: softirq or process
 595  */
 596 struct oz_pd *oz_pd_find(const u8 *mac_addr)
 597 {
 598         struct oz_pd *pd;
 599         struct list_head *e;
 600
 601         spin_lock_bh(&g_polling_lock);
 602         list_for_each(e, &g_pd_list) {
 603                 pd = container_of(e, struct oz_pd, link);
 604                 if (ether_addr_equal(pd->mac_addr, mac_addr)) {
 605                         atomic_inc(&pd->ref_count);
 606                         spin_unlock_bh(&g_polling_lock);
 607                         return pd;
 608                 }
 609         }
 610         spin_unlock_bh(&g_polling_lock);
 611         return NULL;
 612 }
 613
 614 /*
 615  * Context: process
 616  */
 617 void oz_app_enable(int app_id, int enable)
 618 {
 619         if (app_id <= OZ_APPID_MAX) {
 620                 spin_lock_bh(&g_polling_lock);
 621                 if (enable)
 622                         g_apps |= (1<<app_id);
 623                 else
 624                         g_apps &= ~(1<<app_id);
 625                 spin_unlock_bh(&g_polling_lock);
 626         }
 627 }
 628
 629 /*
 630  * Context: softirq
 631  */
 632 static int oz_pkt_recv(struct sk_buff *skb, struct net_device *dev,
 633                 struct packet_type *pt, struct net_device *orig_dev)
 634 {
 635         skb = skb_share_check(skb, GFP_ATOMIC);
 636         if (skb == NULL)
 637                 return 0;
 638         spin_lock_bh(&g_rx_queue.lock);
 639         if (g_processing_rx) {
 640                 /* We already hold the lock so use __ variant.
 641                  */
 642                 __skb_queue_head(&g_rx_queue, skb);
 643                 spin_unlock_bh(&g_rx_queue.lock);
 644         } else {
 645                 g_processing_rx = 1;
 646                 do {
 647
 648                         spin_unlock_bh(&g_rx_queue.lock);
 649                         oz_rx_frame(skb);
 650                         spin_lock_bh(&g_rx_queue.lock);
 651                         if (skb_queue_empty(&g_rx_queue)) {
 652                                 g_processing_rx = 0;
 653                                 spin_unlock_bh(&g_rx_queue.lock);
 654                                 break;
 655                         }
 656                         /* We already hold the lock so use __ variant.
 657                          */
 658                         skb = __skb_dequeue(&g_rx_queue);
 659                 } while (1);
 660         }
 661         return 0;
 662 }
 663
 664 /*
 665  * Context: process
 666  */
 667 void oz_binding_add(const char *net_dev)
 668 {
 669         struct oz_binding *binding;
 670
 671         binding = kzalloc(sizeof(struct oz_binding), GFP_KERNEL);
 672         if (!binding)
 673                 return;
 674
 675         binding->ptype.type = htons(OZ_ETHERTYPE);
 676         binding->ptype.func = oz_pkt_recv;
 677         if (net_dev && *net_dev) {
 678                 memcpy(binding->name, net_dev, OZ_MAX_BINDING_LEN);
 679                 oz_dbg(ON, "Adding binding: %s\n", net_dev);
 680                 binding->ptype.dev = dev_get_by_name(&init_net, net_dev);
 681                 if (binding->ptype.dev == NULL) {
 682                         oz_dbg(ON, "Netdev %s not found\n", net_dev);
 683                         kfree(binding);
 684                         return;
 685                 }
 686         }
 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  * 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[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                 ether_addr_copy((u8 *)&addr[count++], pd->mac_addr);
 796         }
 797         spin_unlock_bh(&g_polling_lock);
 798         return count;
 799 }
 800