drivers/staging/ozwpan/ozproto.c

   1 /* -----------------------------------------------------------------------------
   2  * Copyright (c) 2011 Ozmo Inc
   3  * Released under the GNU General Public License Version 2 (GPLv2).
   4  * -----------------------------------------------------------------------------
   5  */
   6
   7 #include <linux/init.h>
   8 #include <linux/module.h>
   9 #include <linux/timer.h>
  10 #include <linux/sched.h>
  11 #include <linux/netdevice.h>
  12 #include <linux/errno.h>
  13 #include <linux/ieee80211.h>
  14 #include "ozdbg.h"
  15 #include "ozprotocol.h"
  16 #include "ozeltbuf.h"
  17 #include "ozpd.h"
  18 #include "ozproto.h"
  19 #include "ozusbsvc.h"
  20
  21 #include "ozappif.h"
  22 #include <asm/unaligned.h>
  23 #include <linux/uaccess.h>
  24 #include <net/psnap.h>
  25
  26 #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  * Static external variables.
  42  */
  43 static DEFINE_SPINLOCK(g_polling_lock);
  44 static LIST_HEAD(g_pd_list);
  45 static LIST_HEAD(g_binding);
  46 static DEFINE_SPINLOCK(g_binding_lock);
  47 static struct sk_buff_head g_rx_queue;
  48 static u8 g_session_id;
  49 static u16 g_apps = 0x1;
  50 static int g_processing_rx;
  51
  52 /*
  53  * Context: softirq-serialized
  54  */
  55 static u8 oz_get_new_session_id(u8 exclude)
  56 {
  57         if (++g_session_id == 0)
  58                 g_session_id = 1;
  59         if (g_session_id == exclude) {
  60                 if (++g_session_id == 0)
  61                         g_session_id = 1;
  62         }
  63         return g_session_id;
  64 }
  65
  66 /*
  67  * Context: softirq-serialized
  68  */
  69 static void oz_send_conn_rsp(struct oz_pd *pd, u8 status)
  70 {
  71         struct sk_buff *skb;
  72         struct net_device *dev = pd->net_dev;
  73         struct oz_hdr *oz_hdr;
  74         struct oz_elt *elt;
  75         struct oz_elt_connect_rsp *body;
  76
  77         int sz = sizeof(struct oz_hdr) + sizeof(struct oz_elt) +
  78                         sizeof(struct oz_elt_connect_rsp);
  79         skb = alloc_skb(sz + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC);
  80         if (skb == NULL)
  81                 return;
  82         skb_reserve(skb, LL_RESERVED_SPACE(dev));
  83         skb_reset_network_header(skb);
  84         oz_hdr = (struct oz_hdr *)skb_put(skb, sz);
  85         elt = (struct oz_elt *)(oz_hdr+1);
  86         body = (struct oz_elt_connect_rsp *)(elt+1);
  87         skb->dev = dev;
  88         skb->protocol = htons(OZ_ETHERTYPE);
  89         /* Fill in device header */
  90         if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr,
  91                         dev->dev_addr, skb->len) < 0) {
  92                 kfree_skb(skb);
  93                 return;
  94         }
  95         oz_hdr->control = (OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT);
  96         oz_hdr->last_pkt_num = 0;
  97         put_unaligned(0, &oz_hdr->pkt_num);
  98         elt->type = OZ_ELT_CONNECT_RSP;
  99         elt->length = sizeof(struct oz_elt_connect_rsp);
 100         memset(body, 0, sizeof(struct oz_elt_connect_rsp));
 101         body->status = status;
 102         if (status == 0) {
 103                 body->mode = pd->mode;
 104                 body->session_id = pd->session_id;
 105                 put_unaligned(cpu_to_le16(pd->total_apps), &body->apps);
 106         }
 107         oz_dbg(ON, "TX: OZ_ELT_CONNECT_RSP %d", status);
 108         dev_queue_xmit(skb);
 109         return;
 110 }
 111
 112 /*
 113  * Context: softirq-serialized
 114  */
 115 static void pd_set_keepalive(struct oz_pd *pd, u8 kalive)
 116 {
 117         unsigned long keep_alive = kalive & OZ_KALIVE_VALUE_MASK;
 118
 119         switch (kalive & OZ_KALIVE_TYPE_MASK) {
 120         case OZ_KALIVE_SPECIAL:
 121                 pd->keep_alive = keep_alive * 1000*60*60*24*20;
 122                 break;
 123         case OZ_KALIVE_SECS:
 124                 pd->keep_alive = keep_alive*1000;
 125                 break;
 126         case OZ_KALIVE_MINS:
 127                 pd->keep_alive = keep_alive*1000*60;
 128                 break;
 129         case OZ_KALIVE_HOURS:
 130                 pd->keep_alive = keep_alive*1000*60*60;
 131                 break;
 132         default:
 133                 pd->keep_alive = 0;
 134         }
 135         oz_dbg(ON, "Keepalive = %lu mSec\n", pd->keep_alive);
 136 }
 137
 138 /*
 139  * Context: softirq-serialized
 140  */
 141 static void pd_set_presleep(struct oz_pd *pd, u8 presleep, u8 start_timer)
 142 {
 143         if (presleep)
 144                 pd->presleep = presleep*100;
 145         else
 146                 pd->presleep = OZ_PRESLEEP_TOUT;
 147         if (start_timer) {
 148                 spin_unlock(&g_polling_lock);
 149                 oz_timer_add(pd, OZ_TIMER_TOUT, pd->presleep);
 150                 spin_lock(&g_polling_lock);
 151         }
 152         oz_dbg(ON, "Presleep time = %lu mSec\n", pd->presleep);
 153 }
 154
 155 /*
 156  * Context: softirq-serialized
 157  */
 158 static struct oz_pd *oz_connect_req(struct oz_pd *cur_pd, struct oz_elt *elt,
 159                         const u8 *pd_addr, struct net_device *net_dev)
 160 {
 161         struct oz_pd *pd;
 162         struct oz_elt_connect_req *body =
 163                         (struct oz_elt_connect_req *)(elt+1);
 164         u8 rsp_status = OZ_STATUS_SUCCESS;
 165         u8 stop_needed = 0;
 166         u16 new_apps = g_apps;
 167         struct net_device *old_net_dev = NULL;
 168         struct oz_pd *free_pd = NULL;
 169
 170         if (cur_pd) {
 171                 pd = cur_pd;
 172                 spin_lock_bh(&g_polling_lock);
 173         } else {
 174                 struct oz_pd *pd2 = NULL;
 175                 struct list_head *e;
 176                 pd = oz_pd_alloc(pd_addr);
 177                 if (pd == NULL)
 178                         return NULL;
 179                 getnstimeofday(&pd->last_rx_timestamp);
 180                 spin_lock_bh(&g_polling_lock);
 181                 list_for_each(e, &g_pd_list) {
 182                         pd2 = container_of(e, struct oz_pd, link);
 183                         if (memcmp(pd2->mac_addr, pd_addr, ETH_ALEN) == 0) {
 184                                 free_pd = pd;
 185                                 pd = pd2;
 186                                 break;
 187                         }
 188                 }
 189                 if (pd != pd2)
 190                         list_add_tail(&pd->link, &g_pd_list);
 191         }
 192         if (pd == NULL) {
 193                 spin_unlock_bh(&g_polling_lock);
 194                 return NULL;
 195         }
 196         if (pd->net_dev != net_dev) {
 197                 old_net_dev = pd->net_dev;
 198                 dev_hold(net_dev);
 199                 pd->net_dev = net_dev;
 200         }
 201         oz_dbg(ON, "Host vendor: %d\n", body->host_vendor);
 202         pd->max_tx_size = OZ_MAX_TX_SIZE;
 203         pd->mode = body->mode;
 204         pd->pd_info = body->pd_info;
 205         if (pd->mode & OZ_F_ISOC_NO_ELTS) {
 206                 pd->ms_per_isoc = body->ms_per_isoc;
 207                 if (!pd->ms_per_isoc)
 208                         pd->ms_per_isoc = 4;
 209
 210                 switch (body->ms_isoc_latency & OZ_LATENCY_MASK) {
 211                 case OZ_ONE_MS_LATENCY:
 212                         pd->isoc_latency = (body->ms_isoc_latency &
 213                                         ~OZ_LATENCY_MASK) / pd->ms_per_isoc;
 214                         break;
 215                 case OZ_TEN_MS_LATENCY:
 216                         pd->isoc_latency = ((body->ms_isoc_latency &
 217                                 ~OZ_LATENCY_MASK) * 10) / pd->ms_per_isoc;
 218                         break;
 219                 default:
 220                         pd->isoc_latency = OZ_MAX_TX_QUEUE_ISOC;
 221                 }
 222         }
 223         if (body->max_len_div16)
 224                 pd->max_tx_size = ((u16)body->max_len_div16)<<4;
 225         oz_dbg(ON, "Max frame:%u Ms per isoc:%u\n",
 226                pd->max_tx_size, pd->ms_per_isoc);
 227         pd->max_stream_buffering = 3*1024;
 228         pd->pulse_period = OZ_QUANTUM;
 229         pd_set_presleep(pd, body->presleep, 0);
 230         pd_set_keepalive(pd, body->keep_alive);
 231
 232         new_apps &= le16_to_cpu(get_unaligned(&body->apps));
 233         if ((new_apps & 0x1) && (body->session_id)) {
 234                 if (pd->session_id) {
 235                         if (pd->session_id != body->session_id) {
 236                                 rsp_status = OZ_STATUS_SESSION_MISMATCH;
 237                                 goto done;
 238                         }
 239                 } else {
 240                         new_apps &= ~0x1;  /* Resume not permitted */
 241                         pd->session_id =
 242                                 oz_get_new_session_id(body->session_id);
 243                 }
 244         } else {
 245                 if (pd->session_id && !body->session_id) {
 246                         rsp_status = OZ_STATUS_SESSION_TEARDOWN;
 247                         stop_needed = 1;
 248                 } else {
 249                         new_apps &= ~0x1;  /* Resume not permitted */
 250                         pd->session_id =
 251                                 oz_get_new_session_id(body->session_id);
 252                 }
 253         }
 254 done:
 255         if (rsp_status == OZ_STATUS_SUCCESS) {
 256                 u16 start_apps = new_apps & ~pd->total_apps & ~0x1;
 257                 u16 stop_apps = pd->total_apps & ~new_apps & ~0x1;
 258                 u16 resume_apps = new_apps & pd->paused_apps  & ~0x1;
 259                 spin_unlock_bh(&g_polling_lock);
 260                 oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
 261                 oz_dbg(ON, "new_apps=0x%x total_apps=0x%x paused_apps=0x%x\n",
 262                        new_apps, pd->total_apps, pd->paused_apps);
 263                 if (start_apps) {
 264                         if (oz_services_start(pd, start_apps, 0))
 265                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 266                 }
 267                 if (resume_apps)
 268                         if (oz_services_start(pd, resume_apps, 1))
 269                                 rsp_status = OZ_STATUS_TOO_MANY_PDS;
 270                 if (stop_apps)
 271                         oz_services_stop(pd, stop_apps, 0);
 272                 oz_pd_request_heartbeat(pd);
 273         } else {
 274                 spin_unlock_bh(&g_polling_lock);
 275         }
 276         oz_send_conn_rsp(pd, rsp_status);
 277         if (rsp_status != OZ_STATUS_SUCCESS) {
 278                 if (stop_needed)
 279                         oz_pd_stop(pd);
 280                 oz_pd_put(pd);
 281                 pd = NULL;
 282         }
 283         if (old_net_dev)
 284                 dev_put(old_net_dev);
 285         if (free_pd)
 286                 oz_pd_destroy(free_pd);
 287         return pd;
 288 }
 289
 290 /*
 291  * Context: softirq-serialized
 292  */
 293 static void oz_add_farewell(struct oz_pd *pd, u8 ep_num, u8 index,
 294                         const u8 *report, u8 len)
 295 {
 296         struct oz_farewell *f;
 297         struct oz_farewell *f2;
 298         int found = 0;
 299
 300         f = kmalloc(sizeof(struct oz_farewell) + len, GFP_ATOMIC);
 301         if (!f)
 302                 return;
 303         f->ep_num = ep_num;
 304         f->index = index;
 305         f->len = len;
 306         memcpy(f->report, report, len);
 307         oz_dbg(ON, "RX: Adding farewell report\n");
 308         spin_lock(&g_polling_lock);
 309         list_for_each_entry(f2, &pd->farewell_list, link) {
 310                 if ((f2->ep_num == ep_num) && (f2->index == index)) {
 311                         found = 1;
 312                         list_del(&f2->link);
 313                         break;
 314                 }
 315         }
 316         list_add_tail(&f->link, &pd->farewell_list);
 317         spin_unlock(&g_polling_lock);
 318         if (found)
 319                 kfree(f2);
 320 }
 321
 322 /*
 323  * Context: softirq-serialized
 324  */
 325 static void oz_rx_frame(struct sk_buff *skb)
 326 {
 327         u8 *mac_hdr;
 328         u8 *src_addr;
 329         struct oz_elt *elt;
 330         int length;
 331         struct oz_pd *pd = NULL;
 332         struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb);
 333         struct timespec current_time;
 334         int dup = 0;
 335         u32 pkt_num;
 336
 337         oz_dbg(RX_FRAMES, "RX frame PN=0x%x LPN=0x%x control=0x%x\n",
 338                oz_hdr->pkt_num, oz_hdr->last_pkt_num, oz_hdr->control);
 339         mac_hdr = skb_mac_header(skb);
 340         src_addr = &mac_hdr[ETH_ALEN] ;
 341         length = skb->len;
 342
 343         /* Check the version field */
 344         if (oz_get_prot_ver(oz_hdr->control) != OZ_PROTOCOL_VERSION) {
 345                 oz_dbg(ON, "Incorrect protocol version: %d\n",
 346                        oz_get_prot_ver(oz_hdr->control));
 347                 goto done;
 348         }
 349
 350         pkt_num = le32_to_cpu(get_unaligned(&oz_hdr->pkt_num));
 351
 352         pd = oz_pd_find(src_addr);
 353         if (pd) {
 354                 if (!(pd->state & OZ_PD_S_CONNECTED))
 355                         oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
 356                 getnstimeofday(&current_time);
 357                 if ((current_time.tv_sec != pd->last_rx_timestamp.tv_sec) ||
 358                         (pd->presleep < MSEC_PER_SEC))  {
 359                         oz_timer_add(pd, OZ_TIMER_TOUT, pd->presleep);
 360                         pd->last_rx_timestamp = current_time;
 361                 }
 362                 if (pkt_num != pd->last_rx_pkt_num) {
 363                         pd->last_rx_pkt_num = pkt_num;
 364                 } else {
 365                         dup = 1;
 366                         oz_dbg(ON, "Duplicate frame\n");
 367                 }
 368         }
 369
 370         if (pd && !dup && ((pd->mode & OZ_MODE_MASK) == OZ_MODE_TRIGGERED)) {
 371                 oz_dbg(RX_FRAMES, "Received TRIGGER Frame\n");
 372                 pd->last_sent_frame = &pd->tx_queue;
 373                 if (oz_hdr->control & OZ_F_ACK) {
 374                         /* Retire completed frames */
 375                         oz_retire_tx_frames(pd, oz_hdr->last_pkt_num);
 376                 }
 377                 if ((oz_hdr->control & OZ_F_ACK_REQUESTED) &&
 378                                 (pd->state == OZ_PD_S_CONNECTED)) {
 379                         int backlog = pd->nb_queued_frames;
 380                         pd->trigger_pkt_num = pkt_num;
 381                         /* Send queued frames */
 382                         oz_send_queued_frames(pd, backlog);
 383                 }
 384         }
 385
 386         length -= sizeof(struct oz_hdr);
 387         elt = (struct oz_elt *)((u8 *)oz_hdr + sizeof(struct oz_hdr));
 388
 389         while (length >= sizeof(struct oz_elt)) {
 390                 length -= sizeof(struct oz_elt) + elt->length;
 391                 if (length < 0)
 392                         break;
 393                 switch (elt->type) {
 394                 case OZ_ELT_CONNECT_REQ:
 395                         oz_dbg(ON, "RX: OZ_ELT_CONNECT_REQ\n");
 396                         pd = oz_connect_req(pd, elt, src_addr, skb->dev);
 397                         break;
 398                 case OZ_ELT_DISCONNECT:
 399                         oz_dbg(ON, "RX: OZ_ELT_DISCONNECT\n");
 400                         if (pd)
 401                                 oz_pd_sleep(pd);
 402                         break;
 403                 case OZ_ELT_UPDATE_PARAM_REQ: {
 404                                 struct oz_elt_update_param *body =
 405                                         (struct oz_elt_update_param *)(elt + 1);
 406                                 oz_dbg(ON, "RX: OZ_ELT_UPDATE_PARAM_REQ\n");
 407                                 if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 408                                         spin_lock(&g_polling_lock);
 409                                         pd_set_keepalive(pd, body->keepalive);
 410                                         pd_set_presleep(pd, body->presleep, 1);
 411                                         spin_unlock(&g_polling_lock);
 412                                 }
 413                         }
 414                         break;
 415                 case OZ_ELT_FAREWELL_REQ: {
 416                                 struct oz_elt_farewell *body =
 417                                         (struct oz_elt_farewell *)(elt + 1);
 418                                 oz_dbg(ON, "RX: OZ_ELT_FAREWELL_REQ\n");
 419                                 oz_add_farewell(pd, body->ep_num,
 420                                         body->index, body->report,
 421                                         elt->length + 1 - sizeof(*body));
 422                         }
 423                         break;
 424                 case OZ_ELT_APP_DATA:
 425                         if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
 426                                 struct oz_app_hdr *app_hdr =
 427                                         (struct oz_app_hdr *)(elt+1);
 428                                 if (dup)
 429                                         break;
 430                                 oz_handle_app_elt(pd, app_hdr->app_id, elt);
 431                         }
 432                         break;
 433                 default:
 434                         oz_dbg(ON, "RX: Unknown elt %02x\n", elt->type);
 435                 }
 436                 elt = oz_next_elt(elt);
 437         }
 438 done:
 439         if (pd)
 440                 oz_pd_put(pd);
 441         consume_skb(skb);
 442 }
 443
 444 /*
 445  * Context: process
 446  */
 447 void oz_protocol_term(void)
 448 {
 449         struct oz_binding *b, *t;
 450
 451         /* Walk the list of bindings and remove each one.
 452          */
 453         spin_lock_bh(&g_binding_lock);
 454         list_for_each_entry_safe(b, t, &g_binding, link) {
 455                 list_del(&b->link);
 456                 spin_unlock_bh(&g_binding_lock);
 457                 dev_remove_pack(&b->ptype);
 458                 if (b->ptype.dev)
 459                         dev_put(b->ptype.dev);
 460                 kfree(b);
 461                 spin_lock_bh(&g_binding_lock);
 462         }
 463         spin_unlock_bh(&g_binding_lock);
 464         /* Walk the list of PDs and stop each one. This causes the PD to be
 465          * removed from the list so we can just pull each one from the head
 466          * of the list.
 467          */
 468         spin_lock_bh(&g_polling_lock);
 469         while (!list_empty(&g_pd_list)) {
 470                 struct oz_pd *pd =
 471                         list_first_entry(&g_pd_list, struct oz_pd, link);
 472                 oz_pd_get(pd);
 473                 spin_unlock_bh(&g_polling_lock);
 474                 oz_pd_stop(pd);
 475                 oz_pd_put(pd);
 476                 spin_lock_bh(&g_polling_lock);
 477         }
 478         spin_unlock_bh(&g_polling_lock);
 479         oz_dbg(ON, "Protocol stopped\n");
 480 }
 481
 482 /*
 483  * Context: softirq
 484  */
 485 void oz_pd_heartbeat_handler(unsigned long data)
 486 {
 487         struct oz_pd *pd = (struct oz_pd *)data;
 488         u16 apps = 0;
 489
 490         spin_lock_bh(&g_polling_lock);
 491         if (pd->state & OZ_PD_S_CONNECTED)
 492                 apps = pd->total_apps;
 493         spin_unlock_bh(&g_polling_lock);
 494         if (apps)
 495                 oz_pd_heartbeat(pd, apps);
 496         oz_pd_put(pd);
 497 }
 498
 499 /*
 500  * Context: softirq
 501  */
 502 void oz_pd_timeout_handler(unsigned long data)
 503 {
 504         int type;
 505         struct oz_pd *pd = (struct oz_pd *)data;
 506
 507         spin_lock_bh(&g_polling_lock);
 508         type = pd->timeout_type;
 509         spin_unlock_bh(&g_polling_lock);
 510         switch (type) {
 511         case OZ_TIMER_TOUT:
 512                 oz_pd_sleep(pd);
 513                 break;
 514         case OZ_TIMER_STOP:
 515                 oz_pd_stop(pd);
 516                 break;
 517         }
 518         oz_pd_put(pd);
 519 }
 520
 521 /*
 522  * Context: Interrupt
 523  */
 524 enum hrtimer_restart oz_pd_heartbeat_event(struct hrtimer *timer)
 525 {
 526         struct oz_pd *pd;
 527
 528         pd = container_of(timer, struct oz_pd, heartbeat);
 529         hrtimer_forward_now(timer, ktime_set(pd->pulse_period /
 530         MSEC_PER_SEC, (pd->pulse_period % MSEC_PER_SEC) * NSEC_PER_MSEC));
 531         oz_pd_get(pd);
 532         tasklet_schedule(&pd->heartbeat_tasklet);
 533         return HRTIMER_RESTART;
 534 }
 535
 536 /*
 537  * Context: Interrupt
 538  */
 539 enum hrtimer_restart oz_pd_timeout_event(struct hrtimer *timer)
 540 {
 541         struct oz_pd *pd;
 542
 543         pd = container_of(timer, struct oz_pd, timeout);
 544         oz_pd_get(pd);
 545         tasklet_schedule(&pd->timeout_tasklet);
 546         return HRTIMER_NORESTART;
 547 }
 548
 549 /*
 550  * Context: softirq or process
 551  */
 552 void oz_timer_add(struct oz_pd *pd, int type, unsigned long due_time)
 553 {
 554         spin_lock_bh(&g_polling_lock);
 555         switch (type) {
 556         case OZ_TIMER_TOUT:
 557         case OZ_TIMER_STOP:
 558                 if (hrtimer_active(&pd->timeout)) {
 559                         hrtimer_set_expires(&pd->timeout, ktime_set(due_time /
 560                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 561                                                         NSEC_PER_MSEC));
 562                         hrtimer_start_expires(&pd->timeout, HRTIMER_MODE_REL);
 563                 } else {
 564                         hrtimer_start(&pd->timeout, ktime_set(due_time /
 565                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 566                                         NSEC_PER_MSEC), HRTIMER_MODE_REL);
 567                 }
 568                 pd->timeout_type = type;
 569                 break;
 570         case OZ_TIMER_HEARTBEAT:
 571                 if (!hrtimer_active(&pd->heartbeat))
 572                         hrtimer_start(&pd->heartbeat, ktime_set(due_time /
 573                         MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
 574                                         NSEC_PER_MSEC), HRTIMER_MODE_REL);
 575                 break;
 576         }
 577         spin_unlock_bh(&g_polling_lock);
 578 }
 579
 580 /*
 581  * Context: softirq or process
 582  */
 583 void oz_pd_request_heartbeat(struct oz_pd *pd)
 584 {
 585         oz_timer_add(pd, OZ_TIMER_HEARTBEAT, pd->pulse_period > 0 ?
 586                                         pd->pulse_period : OZ_QUANTUM);
 587 }
 588
 589 /*
 590  * Context: softirq or process
 591  */
 592 struct oz_pd *oz_pd_find(const u8 *mac_addr)
 593 {
 594         struct oz_pd *pd;
 595         struct list_head *e;
 596
 597         spin_lock_bh(&g_polling_lock);
 598         list_for_each(e, &g_pd_list) {
 599                 pd = container_of(e, struct oz_pd, link);
 600                 if (memcmp(pd->mac_addr, mac_addr, ETH_ALEN) == 0) {
 601                         atomic_inc(&pd->ref_count);
 602                         spin_unlock_bh(&g_polling_lock);
 603                         return pd;
 604                 }
 605         }
 606         spin_unlock_bh(&g_polling_lock);
 607         return NULL;
 608 }
 609
 610 /*
 611  * Context: process
 612  */
 613 void oz_app_enable(int app_id, int enable)
 614 {
 615         if (app_id <= OZ_APPID_MAX) {
 616                 spin_lock_bh(&g_polling_lock);
 617                 if (enable)
 618                         g_apps |= (1<<app_id);
 619                 else
 620                         g_apps &= ~(1<<app_id);
 621                 spin_unlock_bh(&g_polling_lock);
 622         }
 623 }
 624
 625 /*
 626  * Context: softirq
 627  */
 628 static int oz_pkt_recv(struct sk_buff *skb, struct net_device *dev,
 629                 struct packet_type *pt, struct net_device *orig_dev)
 630 {
 631         skb = skb_share_check(skb, GFP_ATOMIC);
 632         if (skb == NULL)
 633                 return 0;
 634         spin_lock_bh(&g_rx_queue.lock);
 635         if (g_processing_rx) {
 636                 /* We already hold the lock so use __ variant.
 637                  */
 638                 __skb_queue_head(&g_rx_queue, skb);
 639                 spin_unlock_bh(&g_rx_queue.lock);
 640         } else {
 641                 g_processing_rx = 1;
 642                 do {
 643
 644                         spin_unlock_bh(&g_rx_queue.lock);
 645                         oz_rx_frame(skb);
 646                         spin_lock_bh(&g_rx_queue.lock);
 647                         if (skb_queue_empty(&g_rx_queue)) {
 648                                 g_processing_rx = 0;
 649                                 spin_unlock_bh(&g_rx_queue.lock);
 650                                 break;
 651                         }
 652                         /* We already hold the lock so use __ variant.
 653                          */
 654                         skb = __skb_dequeue(&g_rx_queue);
 655                 } while (1);
 656         }
 657         return 0;
 658 }
 659
 660 /*
 661  * Context: process
 662  */
 663 void oz_binding_add(const char *net_dev)
 664 {
 665         struct oz_binding *binding;
 666
 667         binding = kmalloc(sizeof(struct oz_binding), GFP_KERNEL);
 668         if (binding) {
 669                 binding->ptype.type = __constant_htons(OZ_ETHERTYPE);
 670                 binding->ptype.func = oz_pkt_recv;
 671                 memcpy(binding->name, net_dev, OZ_MAX_BINDING_LEN);
 672                 if (net_dev && *net_dev) {
 673                         oz_dbg(ON, "Adding binding: %s\n", net_dev);
 674                         binding->ptype.dev =
 675                                 dev_get_by_name(&init_net, net_dev);
 676                         if (binding->ptype.dev == NULL) {
 677                                 oz_dbg(ON, "Netdev %s not found\n", net_dev);
 678                                 kfree(binding);
 679                                 binding = NULL;
 680                         }
 681                 } else {
 682                         oz_dbg(ON, "Binding to all netcards\n");
 683                         binding->ptype.dev = NULL;
 684                 }
 685                 if (binding) {
 686                         dev_add_pack(&binding->ptype);
 687                         spin_lock_bh(&g_binding_lock);
 688                         list_add_tail(&binding->link, &g_binding);
 689                         spin_unlock_bh(&g_binding_lock);
 690                 }
 691         }
 692 }
 693
 694 /*
 695  * Context: process
 696  */
 697 static void pd_stop_all_for_device(struct net_device *net_dev)
 698 {
 699         struct list_head h;
 700         struct oz_pd *pd;
 701         struct oz_pd *n;
 702
 703         INIT_LIST_HEAD(&h);
 704         spin_lock_bh(&g_polling_lock);
 705         list_for_each_entry_safe(pd, n, &g_pd_list, link) {
 706                 if (pd->net_dev == net_dev) {
 707                         list_move(&pd->link, &h);
 708                         oz_pd_get(pd);
 709                 }
 710         }
 711         spin_unlock_bh(&g_polling_lock);
 712         while (!list_empty(&h)) {
 713                 pd = list_first_entry(&h, struct oz_pd, link);
 714                 oz_pd_stop(pd);
 715                 oz_pd_put(pd);
 716         }
 717 }
 718
 719 /*
 720  * Context: process
 721  */
 722 void oz_binding_remove(const char *net_dev)
 723 {
 724         struct oz_binding *binding;
 725         int found = 0;
 726
 727         oz_dbg(ON, "Removing binding: %s\n", net_dev);
 728         spin_lock_bh(&g_binding_lock);
 729         list_for_each_entry(binding, &g_binding, link) {
 730                 if (strncmp(binding->name, net_dev, OZ_MAX_BINDING_LEN) == 0) {
 731                         oz_dbg(ON, "Binding '%s' found\n", net_dev);
 732                         found = 1;
 733                         break;
 734                 }
 735         }
 736         spin_unlock_bh(&g_binding_lock);
 737         if (found) {
 738                 dev_remove_pack(&binding->ptype);
 739                 if (binding->ptype.dev) {
 740                         dev_put(binding->ptype.dev);
 741                         pd_stop_all_for_device(binding->ptype.dev);
 742                 }
 743                 list_del(&binding->link);
 744                 kfree(binding);
 745         }
 746 }
 747
 748 /*
 749  * Context: process
 750  */
 751 static char *oz_get_next_device_name(char *s, char *dname, int max_size)
 752 {
 753         while (*s == ',')
 754                 s++;
 755         while (*s && (*s != ',') && max_size > 1) {
 756                 *dname++ = *s++;
 757                 max_size--;
 758         }
 759         *dname = 0;
 760         return s;
 761 }
 762
 763 /*
 764  * Context: process
 765  */
 766 int oz_protocol_init(char *devs)
 767 {
 768         skb_queue_head_init(&g_rx_queue);
 769         if (devs && (devs[0] == '*')) {
 770                 oz_binding_add(NULL);
 771         } else {
 772                 char d[32];
 773                 while (*devs) {
 774                         devs = oz_get_next_device_name(devs, d, sizeof(d));
 775                         if (d[0])
 776                                 oz_binding_add(d);
 777                 }
 778         }
 779         return 0;
 780 }
 781
 782 /*
 783  * Context: process
 784  */
 785 int oz_get_pd_list(struct oz_mac_addr *addr, int max_count)
 786 {
 787         struct oz_pd *pd;
 788         struct list_head *e;
 789         int count = 0;
 790
 791         spin_lock_bh(&g_polling_lock);
 792         list_for_each(e, &g_pd_list) {
 793                 if (count >= max_count)
 794                         break;
 795                 pd = container_of(e, struct oz_pd, link);
 796                 memcpy(&addr[count++], pd->mac_addr, ETH_ALEN);
 797         }
 798         spin_unlock_bh(&g_polling_lock);
 799         return count;
 800 }
 801
 802 void oz_polling_lock_bh(void)
 803 {
 804         spin_lock_bh(&g_polling_lock);
 805 }
 806
 807 void oz_polling_unlock_bh(void)
 808 {
 809         spin_unlock_bh(&g_polling_lock);
 810 }