Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 1 | /* ----------------------------------------------------------------------------- |
| 2 | * Copyright (c) 2011 Ozmo Inc |
| 3 | * Released under the GNU General Public License Version 2 (GPLv2). |
| 4 | * ----------------------------------------------------------------------------- |
| 5 | */ |
| 6 | #include <linux/init.h> |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/timer.h> |
| 9 | #include <linux/sched.h> |
| 10 | #include <linux/netdevice.h> |
| 11 | #include <linux/errno.h> |
| 12 | #include "ozconfig.h" |
| 13 | #include "ozprotocol.h" |
| 14 | #include "ozeltbuf.h" |
| 15 | #include "ozpd.h" |
| 16 | #include "ozproto.h" |
| 17 | #include "oztrace.h" |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 18 | #include "ozevent.h" |
| 19 | #include "ozcdev.h" |
| 20 | #include "ozusbsvc.h" |
| 21 | #include <asm/unaligned.h> |
| 22 | #include <linux/uaccess.h> |
| 23 | #include <net/psnap.h> |
| 24 | /*------------------------------------------------------------------------------ |
| 25 | */ |
| 26 | #define OZ_MAX_TX_POOL_SIZE 6 |
| 27 | /* Maximum number of uncompleted isoc frames that can be pending. |
| 28 | */ |
| 29 | #define OZ_MAX_SUBMITTED_ISOC 16 |
| 30 | /*------------------------------------------------------------------------------ |
| 31 | */ |
| 32 | static struct oz_tx_frame *oz_tx_frame_alloc(struct oz_pd *pd); |
| 33 | static void oz_tx_frame_free(struct oz_pd *pd, struct oz_tx_frame *f); |
| 34 | static struct sk_buff *oz_build_frame(struct oz_pd *pd, struct oz_tx_frame *f); |
| 35 | static int oz_send_isoc_frame(struct oz_pd *pd); |
| 36 | static void oz_retire_frame(struct oz_pd *pd, struct oz_tx_frame *f); |
| 37 | static void oz_isoc_stream_free(struct oz_isoc_stream *st); |
| 38 | static int oz_send_next_queued_frame(struct oz_pd *pd, int *more_data); |
| 39 | static void oz_isoc_destructor(struct sk_buff *skb); |
| 40 | static int oz_def_app_init(void); |
| 41 | static void oz_def_app_term(void); |
| 42 | static int oz_def_app_start(struct oz_pd *pd, int resume); |
| 43 | static void oz_def_app_stop(struct oz_pd *pd, int pause); |
| 44 | static void oz_def_app_rx(struct oz_pd *pd, struct oz_elt *elt); |
| 45 | /*------------------------------------------------------------------------------ |
| 46 | * Counts the uncompleted isoc frames submitted to netcard. |
| 47 | */ |
| 48 | static atomic_t g_submitted_isoc = ATOMIC_INIT(0); |
| 49 | /* Application handler functions. |
| 50 | */ |
| 51 | static struct oz_app_if g_app_if[OZ_APPID_MAX] = { |
| 52 | {oz_usb_init, |
| 53 | oz_usb_term, |
| 54 | oz_usb_start, |
| 55 | oz_usb_stop, |
| 56 | oz_usb_rx, |
| 57 | oz_usb_heartbeat, |
| 58 | oz_usb_farewell, |
| 59 | OZ_APPID_USB}, |
| 60 | |
| 61 | {oz_def_app_init, |
| 62 | oz_def_app_term, |
| 63 | oz_def_app_start, |
| 64 | oz_def_app_stop, |
| 65 | oz_def_app_rx, |
| 66 | 0, |
| 67 | 0, |
| 68 | OZ_APPID_UNUSED1}, |
| 69 | |
| 70 | {oz_def_app_init, |
| 71 | oz_def_app_term, |
| 72 | oz_def_app_start, |
| 73 | oz_def_app_stop, |
| 74 | oz_def_app_rx, |
| 75 | 0, |
| 76 | 0, |
| 77 | OZ_APPID_UNUSED2}, |
| 78 | |
| 79 | {oz_cdev_init, |
| 80 | oz_cdev_term, |
| 81 | oz_cdev_start, |
| 82 | oz_cdev_stop, |
| 83 | oz_cdev_rx, |
| 84 | 0, |
| 85 | 0, |
| 86 | OZ_APPID_SERIAL}, |
| 87 | }; |
| 88 | /*------------------------------------------------------------------------------ |
| 89 | * Context: process |
| 90 | */ |
| 91 | static int oz_def_app_init(void) |
| 92 | { |
| 93 | return 0; |
| 94 | } |
| 95 | /*------------------------------------------------------------------------------ |
| 96 | * Context: process |
| 97 | */ |
| 98 | static void oz_def_app_term(void) |
| 99 | { |
| 100 | } |
| 101 | /*------------------------------------------------------------------------------ |
| 102 | * Context: softirq |
| 103 | */ |
| 104 | static int oz_def_app_start(struct oz_pd *pd, int resume) |
| 105 | { |
| 106 | return 0; |
| 107 | } |
| 108 | /*------------------------------------------------------------------------------ |
| 109 | * Context: softirq |
| 110 | */ |
| 111 | static void oz_def_app_stop(struct oz_pd *pd, int pause) |
| 112 | { |
| 113 | } |
| 114 | /*------------------------------------------------------------------------------ |
| 115 | * Context: softirq |
| 116 | */ |
| 117 | static void oz_def_app_rx(struct oz_pd *pd, struct oz_elt *elt) |
| 118 | { |
| 119 | } |
| 120 | /*------------------------------------------------------------------------------ |
| 121 | * Context: softirq or process |
| 122 | */ |
| 123 | void oz_pd_set_state(struct oz_pd *pd, unsigned state) |
| 124 | { |
| 125 | pd->state = state; |
| 126 | oz_event_log(OZ_EVT_PD_STATE, 0, 0, 0, state); |
| 127 | #ifdef WANT_TRACE |
| 128 | switch (state) { |
| 129 | case OZ_PD_S_IDLE: |
| 130 | oz_trace("PD State: OZ_PD_S_IDLE\n"); |
| 131 | break; |
| 132 | case OZ_PD_S_CONNECTED: |
| 133 | oz_trace("PD State: OZ_PD_S_CONNECTED\n"); |
| 134 | break; |
| 135 | case OZ_PD_S_STOPPED: |
| 136 | oz_trace("PD State: OZ_PD_S_STOPPED\n"); |
| 137 | break; |
| 138 | case OZ_PD_S_SLEEP: |
| 139 | oz_trace("PD State: OZ_PD_S_SLEEP\n"); |
| 140 | break; |
| 141 | } |
| 142 | #endif /* WANT_TRACE */ |
| 143 | } |
| 144 | /*------------------------------------------------------------------------------ |
| 145 | * Context: softirq or process |
| 146 | */ |
| 147 | void oz_pd_get(struct oz_pd *pd) |
| 148 | { |
| 149 | atomic_inc(&pd->ref_count); |
| 150 | } |
| 151 | /*------------------------------------------------------------------------------ |
| 152 | * Context: softirq or process |
| 153 | */ |
| 154 | void oz_pd_put(struct oz_pd *pd) |
| 155 | { |
| 156 | if (atomic_dec_and_test(&pd->ref_count)) |
| 157 | oz_pd_destroy(pd); |
| 158 | } |
| 159 | /*------------------------------------------------------------------------------ |
| 160 | * Context: softirq-serialized |
| 161 | */ |
| 162 | struct oz_pd *oz_pd_alloc(u8 *mac_addr) |
| 163 | { |
Greg Kroah-Hartman | 1ec41a3 | 2012-03-02 16:51:09 -0800 | [diff] [blame] | 164 | struct oz_pd *pd = kzalloc(sizeof(struct oz_pd), GFP_ATOMIC); |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 165 | if (pd) { |
| 166 | int i; |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 167 | atomic_set(&pd->ref_count, 2); |
| 168 | for (i = 0; i < OZ_APPID_MAX; i++) |
| 169 | spin_lock_init(&pd->app_lock[i]); |
| 170 | pd->last_rx_pkt_num = 0xffffffff; |
| 171 | oz_pd_set_state(pd, OZ_PD_S_IDLE); |
| 172 | pd->max_tx_size = OZ_MAX_TX_SIZE; |
| 173 | memcpy(pd->mac_addr, mac_addr, ETH_ALEN); |
| 174 | if (0 != oz_elt_buf_init(&pd->elt_buff)) { |
Greg Kroah-Hartman | 1ec41a3 | 2012-03-02 16:51:09 -0800 | [diff] [blame] | 175 | kfree(pd); |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 176 | pd = 0; |
| 177 | } |
| 178 | spin_lock_init(&pd->tx_frame_lock); |
| 179 | INIT_LIST_HEAD(&pd->tx_queue); |
| 180 | INIT_LIST_HEAD(&pd->farewell_list); |
| 181 | pd->last_sent_frame = &pd->tx_queue; |
| 182 | spin_lock_init(&pd->stream_lock); |
| 183 | INIT_LIST_HEAD(&pd->stream_list); |
| 184 | } |
| 185 | return pd; |
| 186 | } |
| 187 | /*------------------------------------------------------------------------------ |
| 188 | * Context: softirq or process |
| 189 | */ |
| 190 | void oz_pd_destroy(struct oz_pd *pd) |
| 191 | { |
| 192 | struct list_head *e; |
| 193 | struct oz_tx_frame *f; |
| 194 | struct oz_isoc_stream *st; |
| 195 | struct oz_farewell *fwell; |
| 196 | oz_trace("Destroying PD\n"); |
| 197 | /* Delete any streams. |
| 198 | */ |
| 199 | e = pd->stream_list.next; |
| 200 | while (e != &pd->stream_list) { |
| 201 | st = container_of(e, struct oz_isoc_stream, link); |
| 202 | e = e->next; |
| 203 | oz_isoc_stream_free(st); |
| 204 | } |
| 205 | /* Free any queued tx frames. |
| 206 | */ |
| 207 | e = pd->tx_queue.next; |
| 208 | while (e != &pd->tx_queue) { |
| 209 | f = container_of(e, struct oz_tx_frame, link); |
| 210 | e = e->next; |
| 211 | oz_retire_frame(pd, f); |
| 212 | } |
| 213 | oz_elt_buf_term(&pd->elt_buff); |
| 214 | /* Free any farewells. |
| 215 | */ |
| 216 | e = pd->farewell_list.next; |
| 217 | while (e != &pd->farewell_list) { |
| 218 | fwell = container_of(e, struct oz_farewell, link); |
| 219 | e = e->next; |
Greg Kroah-Hartman | 1ec41a3 | 2012-03-02 16:51:09 -0800 | [diff] [blame] | 220 | kfree(fwell); |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 221 | } |
| 222 | /* Deallocate all frames in tx pool. |
| 223 | */ |
| 224 | while (pd->tx_pool) { |
| 225 | e = pd->tx_pool; |
| 226 | pd->tx_pool = e->next; |
Greg Kroah-Hartman | 1ec41a3 | 2012-03-02 16:51:09 -0800 | [diff] [blame] | 227 | kfree(container_of(e, struct oz_tx_frame, link)); |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 228 | } |
| 229 | if (pd->net_dev) |
| 230 | dev_put(pd->net_dev); |
Greg Kroah-Hartman | 1ec41a3 | 2012-03-02 16:51:09 -0800 | [diff] [blame] | 231 | kfree(pd); |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 232 | } |
| 233 | /*------------------------------------------------------------------------------ |
| 234 | * Context: softirq-serialized |
| 235 | */ |
| 236 | int oz_services_start(struct oz_pd *pd, u16 apps, int resume) |
| 237 | { |
| 238 | struct oz_app_if *ai; |
| 239 | int rc = 0; |
| 240 | oz_trace("oz_services_start(0x%x) resume(%d)\n", apps, resume); |
| 241 | for (ai = g_app_if; ai < &g_app_if[OZ_APPID_MAX]; ai++) { |
| 242 | if (apps & (1<<ai->app_id)) { |
| 243 | if (ai->start(pd, resume)) { |
| 244 | rc = -1; |
| 245 | oz_trace("Unabled to start service %d\n", |
| 246 | ai->app_id); |
| 247 | break; |
| 248 | } |
| 249 | oz_polling_lock_bh(); |
| 250 | pd->total_apps |= (1<<ai->app_id); |
| 251 | if (resume) |
| 252 | pd->paused_apps &= ~(1<<ai->app_id); |
| 253 | oz_polling_unlock_bh(); |
| 254 | } |
| 255 | } |
| 256 | return rc; |
| 257 | } |
| 258 | /*------------------------------------------------------------------------------ |
| 259 | * Context: softirq or process |
| 260 | */ |
| 261 | void oz_services_stop(struct oz_pd *pd, u16 apps, int pause) |
| 262 | { |
| 263 | struct oz_app_if *ai; |
| 264 | oz_trace("oz_stop_services(0x%x) pause(%d)\n", apps, pause); |
| 265 | for (ai = g_app_if; ai < &g_app_if[OZ_APPID_MAX]; ai++) { |
| 266 | if (apps & (1<<ai->app_id)) { |
| 267 | oz_polling_lock_bh(); |
| 268 | if (pause) { |
| 269 | pd->paused_apps |= (1<<ai->app_id); |
| 270 | } else { |
| 271 | pd->total_apps &= ~(1<<ai->app_id); |
| 272 | pd->paused_apps &= ~(1<<ai->app_id); |
| 273 | } |
| 274 | oz_polling_unlock_bh(); |
| 275 | ai->stop(pd, pause); |
| 276 | } |
| 277 | } |
| 278 | } |
| 279 | /*------------------------------------------------------------------------------ |
| 280 | * Context: softirq |
| 281 | */ |
| 282 | void oz_pd_heartbeat(struct oz_pd *pd, u16 apps) |
| 283 | { |
| 284 | struct oz_app_if *ai; |
| 285 | int more = 0; |
| 286 | for (ai = g_app_if; ai < &g_app_if[OZ_APPID_MAX]; ai++) { |
| 287 | if (ai->heartbeat && (apps & (1<<ai->app_id))) { |
| 288 | if (ai->heartbeat(pd)) |
| 289 | more = 1; |
| 290 | } |
| 291 | } |
| 292 | if (more) |
| 293 | oz_pd_request_heartbeat(pd); |
| 294 | if (pd->mode & OZ_F_ISOC_ANYTIME) { |
| 295 | int count = 8; |
| 296 | while (count-- && (oz_send_isoc_frame(pd) >= 0)) |
| 297 | ; |
| 298 | } |
| 299 | } |
| 300 | /*------------------------------------------------------------------------------ |
| 301 | * Context: softirq or process |
| 302 | */ |
| 303 | void oz_pd_stop(struct oz_pd *pd) |
| 304 | { |
| 305 | u16 stop_apps = 0; |
| 306 | oz_trace("oz_pd_stop() State = 0x%x\n", pd->state); |
| 307 | oz_pd_indicate_farewells(pd); |
| 308 | oz_polling_lock_bh(); |
| 309 | stop_apps = pd->total_apps; |
| 310 | pd->total_apps = 0; |
| 311 | pd->paused_apps = 0; |
| 312 | oz_polling_unlock_bh(); |
| 313 | oz_services_stop(pd, stop_apps, 0); |
| 314 | oz_polling_lock_bh(); |
| 315 | oz_pd_set_state(pd, OZ_PD_S_STOPPED); |
| 316 | /* Remove from PD list.*/ |
| 317 | list_del(&pd->link); |
| 318 | oz_polling_unlock_bh(); |
| 319 | oz_trace("pd ref count = %d\n", atomic_read(&pd->ref_count)); |
| 320 | oz_timer_delete(pd, 0); |
| 321 | oz_pd_put(pd); |
| 322 | } |
| 323 | /*------------------------------------------------------------------------------ |
| 324 | * Context: softirq |
| 325 | */ |
| 326 | int oz_pd_sleep(struct oz_pd *pd) |
| 327 | { |
| 328 | int do_stop = 0; |
| 329 | u16 stop_apps = 0; |
| 330 | oz_polling_lock_bh(); |
| 331 | if (pd->state & (OZ_PD_S_SLEEP | OZ_PD_S_STOPPED)) { |
| 332 | oz_polling_unlock_bh(); |
| 333 | return 0; |
| 334 | } |
| 335 | if (pd->keep_alive_j && pd->session_id) { |
| 336 | oz_pd_set_state(pd, OZ_PD_S_SLEEP); |
| 337 | pd->pulse_time_j = jiffies + pd->keep_alive_j; |
| 338 | oz_trace("Sleep Now %lu until %lu\n", |
| 339 | jiffies, pd->pulse_time_j); |
| 340 | } else { |
| 341 | do_stop = 1; |
| 342 | } |
| 343 | stop_apps = pd->total_apps; |
| 344 | oz_polling_unlock_bh(); |
| 345 | if (do_stop) { |
| 346 | oz_pd_stop(pd); |
| 347 | } else { |
| 348 | oz_services_stop(pd, stop_apps, 1); |
| 349 | oz_timer_add(pd, OZ_TIMER_STOP, jiffies + pd->keep_alive_j, 1); |
| 350 | } |
| 351 | return do_stop; |
| 352 | } |
| 353 | /*------------------------------------------------------------------------------ |
| 354 | * Context: softirq |
| 355 | */ |
| 356 | static struct oz_tx_frame *oz_tx_frame_alloc(struct oz_pd *pd) |
| 357 | { |
| 358 | struct oz_tx_frame *f = 0; |
| 359 | spin_lock_bh(&pd->tx_frame_lock); |
| 360 | if (pd->tx_pool) { |
| 361 | f = container_of(pd->tx_pool, struct oz_tx_frame, link); |
| 362 | pd->tx_pool = pd->tx_pool->next; |
| 363 | pd->tx_pool_count--; |
| 364 | } |
| 365 | spin_unlock_bh(&pd->tx_frame_lock); |
| 366 | if (f == 0) |
Greg Kroah-Hartman | 1ec41a3 | 2012-03-02 16:51:09 -0800 | [diff] [blame] | 367 | f = kmalloc(sizeof(struct oz_tx_frame), GFP_ATOMIC); |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 368 | if (f) { |
| 369 | f->total_size = sizeof(struct oz_hdr); |
| 370 | INIT_LIST_HEAD(&f->link); |
| 371 | INIT_LIST_HEAD(&f->elt_list); |
| 372 | } |
| 373 | return f; |
| 374 | } |
| 375 | /*------------------------------------------------------------------------------ |
| 376 | * Context: softirq or process |
| 377 | */ |
| 378 | static void oz_tx_frame_free(struct oz_pd *pd, struct oz_tx_frame *f) |
| 379 | { |
| 380 | spin_lock_bh(&pd->tx_frame_lock); |
| 381 | if (pd->tx_pool_count < OZ_MAX_TX_POOL_SIZE) { |
| 382 | f->link.next = pd->tx_pool; |
| 383 | pd->tx_pool = &f->link; |
| 384 | pd->tx_pool_count++; |
| 385 | f = 0; |
| 386 | } else { |
Greg Kroah-Hartman | 1ec41a3 | 2012-03-02 16:51:09 -0800 | [diff] [blame] | 387 | kfree(f); |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 388 | } |
| 389 | spin_unlock_bh(&pd->tx_frame_lock); |
| 390 | if (f) |
Greg Kroah-Hartman | 1ec41a3 | 2012-03-02 16:51:09 -0800 | [diff] [blame] | 391 | kfree(f); |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 392 | } |
| 393 | /*------------------------------------------------------------------------------ |
| 394 | * Context: softirq |
| 395 | */ |
| 396 | int oz_prepare_frame(struct oz_pd *pd, int empty) |
| 397 | { |
| 398 | struct oz_tx_frame *f; |
| 399 | if ((pd->mode & OZ_MODE_MASK) != OZ_MODE_TRIGGERED) |
| 400 | return -1; |
| 401 | if (pd->nb_queued_frames >= OZ_MAX_QUEUED_FRAMES) |
| 402 | return -1; |
| 403 | if (!empty && !oz_are_elts_available(&pd->elt_buff)) |
| 404 | return -1; |
| 405 | f = oz_tx_frame_alloc(pd); |
| 406 | if (f == 0) |
| 407 | return -1; |
| 408 | f->hdr.control = |
| 409 | (OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT) | OZ_F_ACK_REQUESTED; |
| 410 | ++pd->last_tx_pkt_num; |
| 411 | put_unaligned(cpu_to_le32(pd->last_tx_pkt_num), &f->hdr.pkt_num); |
| 412 | if (empty == 0) { |
| 413 | oz_select_elts_for_tx(&pd->elt_buff, 0, &f->total_size, |
| 414 | pd->max_tx_size, &f->elt_list); |
| 415 | } |
| 416 | spin_lock(&pd->tx_frame_lock); |
| 417 | list_add_tail(&f->link, &pd->tx_queue); |
| 418 | pd->nb_queued_frames++; |
| 419 | spin_unlock(&pd->tx_frame_lock); |
| 420 | return 0; |
| 421 | } |
| 422 | /*------------------------------------------------------------------------------ |
| 423 | * Context: softirq-serialized |
| 424 | */ |
| 425 | static struct sk_buff *oz_build_frame(struct oz_pd *pd, struct oz_tx_frame *f) |
| 426 | { |
| 427 | struct sk_buff *skb = 0; |
| 428 | struct net_device *dev = pd->net_dev; |
| 429 | struct oz_hdr *oz_hdr; |
| 430 | struct oz_elt *elt; |
| 431 | struct list_head *e; |
| 432 | /* Allocate skb with enough space for the lower layers as well |
| 433 | * as the space we need. |
| 434 | */ |
| 435 | skb = alloc_skb(f->total_size + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC); |
| 436 | if (skb == 0) |
| 437 | return 0; |
| 438 | /* Reserve the head room for lower layers. |
| 439 | */ |
| 440 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| 441 | skb_reset_network_header(skb); |
| 442 | skb->dev = dev; |
| 443 | skb->protocol = htons(OZ_ETHERTYPE); |
| 444 | if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr, |
| 445 | dev->dev_addr, skb->len) < 0) |
| 446 | goto fail; |
| 447 | /* Push the tail to the end of the area we are going to copy to. |
| 448 | */ |
| 449 | oz_hdr = (struct oz_hdr *)skb_put(skb, f->total_size); |
| 450 | f->hdr.last_pkt_num = pd->trigger_pkt_num & OZ_LAST_PN_MASK; |
| 451 | memcpy(oz_hdr, &f->hdr, sizeof(struct oz_hdr)); |
| 452 | /* Copy the elements into the frame body. |
| 453 | */ |
| 454 | elt = (struct oz_elt *)(oz_hdr+1); |
| 455 | for (e = f->elt_list.next; e != &f->elt_list; e = e->next) { |
| 456 | struct oz_elt_info *ei; |
| 457 | ei = container_of(e, struct oz_elt_info, link); |
| 458 | memcpy(elt, ei->data, ei->length); |
| 459 | elt = oz_next_elt(elt); |
| 460 | } |
| 461 | return skb; |
| 462 | fail: |
| 463 | kfree_skb(skb); |
| 464 | return 0; |
| 465 | } |
| 466 | /*------------------------------------------------------------------------------ |
| 467 | * Context: softirq or process |
| 468 | */ |
| 469 | static void oz_retire_frame(struct oz_pd *pd, struct oz_tx_frame *f) |
| 470 | { |
| 471 | struct list_head *e; |
| 472 | struct oz_elt_info *ei; |
| 473 | e = f->elt_list.next; |
| 474 | while (e != &f->elt_list) { |
| 475 | ei = container_of(e, struct oz_elt_info, link); |
| 476 | e = e->next; |
| 477 | list_del_init(&ei->link); |
| 478 | if (ei->callback) |
| 479 | ei->callback(pd, ei->context); |
| 480 | spin_lock_bh(&pd->elt_buff.lock); |
| 481 | oz_elt_info_free(&pd->elt_buff, ei); |
| 482 | spin_unlock_bh(&pd->elt_buff.lock); |
| 483 | } |
| 484 | oz_tx_frame_free(pd, f); |
| 485 | if (pd->elt_buff.free_elts > pd->elt_buff.max_free_elts) |
| 486 | oz_trim_elt_pool(&pd->elt_buff); |
| 487 | } |
| 488 | /*------------------------------------------------------------------------------ |
| 489 | * Context: softirq-serialized |
| 490 | */ |
| 491 | static int oz_send_next_queued_frame(struct oz_pd *pd, int *more_data) |
| 492 | { |
| 493 | struct sk_buff *skb; |
| 494 | struct oz_tx_frame *f; |
| 495 | struct list_head *e; |
| 496 | *more_data = 0; |
| 497 | spin_lock(&pd->tx_frame_lock); |
| 498 | e = pd->last_sent_frame->next; |
| 499 | if (e == &pd->tx_queue) { |
| 500 | spin_unlock(&pd->tx_frame_lock); |
| 501 | return -1; |
| 502 | } |
| 503 | pd->last_sent_frame = e; |
| 504 | if (e->next != &pd->tx_queue) |
| 505 | *more_data = 1; |
| 506 | f = container_of(e, struct oz_tx_frame, link); |
| 507 | skb = oz_build_frame(pd, f); |
| 508 | spin_unlock(&pd->tx_frame_lock); |
| 509 | oz_trace2(OZ_TRACE_TX_FRAMES, "TX frame PN=0x%x\n", f->hdr.pkt_num); |
| 510 | if (skb) { |
| 511 | oz_event_log(OZ_EVT_TX_FRAME, |
| 512 | 0, |
| 513 | (((u16)f->hdr.control)<<8)|f->hdr.last_pkt_num, |
| 514 | 0, f->hdr.pkt_num); |
| 515 | if (dev_queue_xmit(skb) < 0) |
| 516 | return -1; |
| 517 | } |
| 518 | return 0; |
| 519 | } |
| 520 | /*------------------------------------------------------------------------------ |
| 521 | * Context: softirq-serialized |
| 522 | */ |
| 523 | void oz_send_queued_frames(struct oz_pd *pd, int backlog) |
| 524 | { |
| 525 | int more; |
| 526 | if (backlog < OZ_MAX_QUEUED_FRAMES) { |
| 527 | if (oz_send_next_queued_frame(pd, &more) >= 0) { |
| 528 | while (more && oz_send_next_queued_frame(pd, &more)) |
| 529 | ; |
| 530 | } else { |
| 531 | if (((pd->mode & OZ_F_ISOC_ANYTIME) == 0) |
| 532 | || (pd->isoc_sent == 0)) { |
| 533 | if (oz_prepare_frame(pd, 1) >= 0) |
| 534 | oz_send_next_queued_frame(pd, &more); |
| 535 | } |
| 536 | } |
| 537 | } else { |
| 538 | oz_send_next_queued_frame(pd, &more); |
| 539 | } |
| 540 | } |
| 541 | /*------------------------------------------------------------------------------ |
| 542 | * Context: softirq |
| 543 | */ |
| 544 | static int oz_send_isoc_frame(struct oz_pd *pd) |
| 545 | { |
| 546 | struct sk_buff *skb = 0; |
| 547 | struct net_device *dev = pd->net_dev; |
| 548 | struct oz_hdr *oz_hdr; |
| 549 | struct oz_elt *elt; |
| 550 | struct list_head *e; |
| 551 | struct list_head list; |
| 552 | int total_size = sizeof(struct oz_hdr); |
| 553 | INIT_LIST_HEAD(&list); |
| 554 | |
| 555 | oz_select_elts_for_tx(&pd->elt_buff, 1, &total_size, |
| 556 | pd->max_tx_size, &list); |
| 557 | if (list.next == &list) |
| 558 | return 0; |
| 559 | skb = alloc_skb(total_size + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC); |
| 560 | if (skb == 0) { |
| 561 | oz_trace("Cannot alloc skb\n"); |
| 562 | oz_elt_info_free_chain(&pd->elt_buff, &list); |
| 563 | return -1; |
| 564 | } |
| 565 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| 566 | skb_reset_network_header(skb); |
| 567 | skb->dev = dev; |
| 568 | skb->protocol = htons(OZ_ETHERTYPE); |
| 569 | if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr, |
| 570 | dev->dev_addr, skb->len) < 0) { |
| 571 | kfree_skb(skb); |
| 572 | return -1; |
| 573 | } |
| 574 | oz_hdr = (struct oz_hdr *)skb_put(skb, total_size); |
| 575 | oz_hdr->control = (OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT) | OZ_F_ISOC; |
| 576 | oz_hdr->last_pkt_num = pd->trigger_pkt_num & OZ_LAST_PN_MASK; |
| 577 | elt = (struct oz_elt *)(oz_hdr+1); |
| 578 | |
| 579 | for (e = list.next; e != &list; e = e->next) { |
| 580 | struct oz_elt_info *ei; |
| 581 | ei = container_of(e, struct oz_elt_info, link); |
| 582 | memcpy(elt, ei->data, ei->length); |
| 583 | elt = oz_next_elt(elt); |
| 584 | } |
| 585 | oz_event_log(OZ_EVT_TX_ISOC, 0, 0, 0, 0); |
| 586 | dev_queue_xmit(skb); |
| 587 | oz_elt_info_free_chain(&pd->elt_buff, &list); |
| 588 | return 0; |
| 589 | } |
| 590 | /*------------------------------------------------------------------------------ |
| 591 | * Context: softirq-serialized |
| 592 | */ |
| 593 | void oz_retire_tx_frames(struct oz_pd *pd, u8 lpn) |
| 594 | { |
| 595 | struct list_head *e; |
| 596 | struct oz_tx_frame *f; |
| 597 | struct list_head *first = 0; |
| 598 | struct list_head *last = 0; |
| 599 | u8 diff; |
| 600 | u32 pkt_num; |
| 601 | |
| 602 | spin_lock(&pd->tx_frame_lock); |
| 603 | e = pd->tx_queue.next; |
| 604 | while (e != &pd->tx_queue) { |
| 605 | f = container_of(e, struct oz_tx_frame, link); |
| 606 | pkt_num = le32_to_cpu(get_unaligned(&f->hdr.pkt_num)); |
| 607 | diff = (lpn - (pkt_num & OZ_LAST_PN_MASK)) & OZ_LAST_PN_MASK; |
| 608 | if (diff > OZ_LAST_PN_HALF_CYCLE) |
| 609 | break; |
| 610 | if (first == 0) |
| 611 | first = e; |
| 612 | last = e; |
| 613 | e = e->next; |
| 614 | pd->nb_queued_frames--; |
| 615 | } |
| 616 | if (first) { |
| 617 | last->next->prev = &pd->tx_queue; |
| 618 | pd->tx_queue.next = last->next; |
| 619 | last->next = 0; |
| 620 | } |
| 621 | pd->last_sent_frame = &pd->tx_queue; |
| 622 | spin_unlock(&pd->tx_frame_lock); |
| 623 | while (first) { |
| 624 | f = container_of(first, struct oz_tx_frame, link); |
| 625 | first = first->next; |
| 626 | oz_retire_frame(pd, f); |
| 627 | } |
| 628 | } |
| 629 | /*------------------------------------------------------------------------------ |
| 630 | * Precondition: stream_lock must be held. |
| 631 | * Context: softirq |
| 632 | */ |
| 633 | static struct oz_isoc_stream *pd_stream_find(struct oz_pd *pd, u8 ep_num) |
| 634 | { |
| 635 | struct list_head *e; |
| 636 | struct oz_isoc_stream *st; |
| 637 | list_for_each(e, &pd->stream_list) { |
| 638 | st = container_of(e, struct oz_isoc_stream, link); |
| 639 | if (st->ep_num == ep_num) |
| 640 | return st; |
| 641 | } |
| 642 | return 0; |
| 643 | } |
| 644 | /*------------------------------------------------------------------------------ |
| 645 | * Context: softirq |
| 646 | */ |
| 647 | int oz_isoc_stream_create(struct oz_pd *pd, u8 ep_num) |
| 648 | { |
| 649 | struct oz_isoc_stream *st = |
Greg Kroah-Hartman | 1ec41a3 | 2012-03-02 16:51:09 -0800 | [diff] [blame] | 650 | kzalloc(sizeof(struct oz_isoc_stream), GFP_ATOMIC); |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 651 | if (!st) |
Greg Kroah-Hartman | 1ec41a3 | 2012-03-02 16:51:09 -0800 | [diff] [blame] | 652 | return -ENOMEM; |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 653 | st->ep_num = ep_num; |
| 654 | spin_lock_bh(&pd->stream_lock); |
| 655 | if (!pd_stream_find(pd, ep_num)) { |
| 656 | list_add(&st->link, &pd->stream_list); |
| 657 | st = 0; |
| 658 | } |
| 659 | spin_unlock_bh(&pd->stream_lock); |
| 660 | if (st) |
Greg Kroah-Hartman | 1ec41a3 | 2012-03-02 16:51:09 -0800 | [diff] [blame] | 661 | kfree(st); |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 662 | return 0; |
| 663 | } |
| 664 | /*------------------------------------------------------------------------------ |
| 665 | * Context: softirq or process |
| 666 | */ |
| 667 | static void oz_isoc_stream_free(struct oz_isoc_stream *st) |
| 668 | { |
| 669 | if (st->skb) |
| 670 | kfree_skb(st->skb); |
Greg Kroah-Hartman | 1ec41a3 | 2012-03-02 16:51:09 -0800 | [diff] [blame] | 671 | kfree(st); |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 672 | } |
| 673 | /*------------------------------------------------------------------------------ |
| 674 | * Context: softirq |
| 675 | */ |
| 676 | int oz_isoc_stream_delete(struct oz_pd *pd, u8 ep_num) |
| 677 | { |
| 678 | struct oz_isoc_stream *st; |
| 679 | spin_lock_bh(&pd->stream_lock); |
| 680 | st = pd_stream_find(pd, ep_num); |
| 681 | if (st) |
| 682 | list_del(&st->link); |
| 683 | spin_unlock_bh(&pd->stream_lock); |
| 684 | if (st) |
| 685 | oz_isoc_stream_free(st); |
| 686 | return 0; |
| 687 | } |
| 688 | /*------------------------------------------------------------------------------ |
| 689 | * Context: any |
| 690 | */ |
| 691 | static void oz_isoc_destructor(struct sk_buff *skb) |
| 692 | { |
| 693 | atomic_dec(&g_submitted_isoc); |
| 694 | oz_event_log(OZ_EVT_TX_ISOC_DONE, atomic_read(&g_submitted_isoc), |
| 695 | 0, skb, 0); |
| 696 | } |
| 697 | /*------------------------------------------------------------------------------ |
| 698 | * Context: softirq |
| 699 | */ |
| 700 | int oz_send_isoc_unit(struct oz_pd *pd, u8 ep_num, u8 *data, int len) |
| 701 | { |
| 702 | struct net_device *dev = pd->net_dev; |
| 703 | struct oz_isoc_stream *st; |
| 704 | u8 nb_units = 0; |
| 705 | struct sk_buff *skb = 0; |
| 706 | struct oz_hdr *oz_hdr = 0; |
| 707 | int size = 0; |
| 708 | spin_lock_bh(&pd->stream_lock); |
| 709 | st = pd_stream_find(pd, ep_num); |
| 710 | if (st) { |
| 711 | skb = st->skb; |
| 712 | st->skb = 0; |
| 713 | nb_units = st->nb_units; |
| 714 | st->nb_units = 0; |
| 715 | oz_hdr = st->oz_hdr; |
| 716 | size = st->size; |
| 717 | } |
| 718 | spin_unlock_bh(&pd->stream_lock); |
| 719 | if (!st) |
| 720 | return 0; |
| 721 | if (!skb) { |
| 722 | /* Allocate enough space for max size frame. */ |
| 723 | skb = alloc_skb(pd->max_tx_size + OZ_ALLOCATED_SPACE(dev), |
| 724 | GFP_ATOMIC); |
| 725 | if (skb == 0) |
| 726 | return 0; |
| 727 | /* Reserve the head room for lower layers. */ |
| 728 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| 729 | skb_reset_network_header(skb); |
| 730 | skb->dev = dev; |
| 731 | skb->protocol = htons(OZ_ETHERTYPE); |
| 732 | size = sizeof(struct oz_hdr) + sizeof(struct oz_isoc_large); |
| 733 | oz_hdr = (struct oz_hdr *)skb_put(skb, size); |
| 734 | } |
| 735 | memcpy(skb_put(skb, len), data, len); |
| 736 | size += len; |
| 737 | if (++nb_units < pd->ms_per_isoc) { |
| 738 | spin_lock_bh(&pd->stream_lock); |
| 739 | st->skb = skb; |
| 740 | st->nb_units = nb_units; |
| 741 | st->oz_hdr = oz_hdr; |
| 742 | st->size = size; |
| 743 | spin_unlock_bh(&pd->stream_lock); |
| 744 | } else { |
| 745 | struct oz_hdr oz; |
| 746 | struct oz_isoc_large iso; |
| 747 | spin_lock_bh(&pd->stream_lock); |
| 748 | iso.frame_number = st->frame_num; |
| 749 | st->frame_num += nb_units; |
| 750 | spin_unlock_bh(&pd->stream_lock); |
| 751 | oz.control = |
| 752 | (OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT) | OZ_F_ISOC; |
| 753 | oz.last_pkt_num = pd->trigger_pkt_num & OZ_LAST_PN_MASK; |
| 754 | oz.pkt_num = 0; |
| 755 | iso.endpoint = ep_num; |
| 756 | iso.format = OZ_DATA_F_ISOC_LARGE; |
| 757 | iso.ms_data = nb_units; |
| 758 | memcpy(oz_hdr, &oz, sizeof(oz)); |
| 759 | memcpy(oz_hdr+1, &iso, sizeof(iso)); |
| 760 | if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr, |
| 761 | dev->dev_addr, skb->len) < 0) { |
| 762 | kfree_skb(skb); |
| 763 | return -1; |
| 764 | } |
| 765 | if (atomic_read(&g_submitted_isoc) < OZ_MAX_SUBMITTED_ISOC) { |
| 766 | skb->destructor = oz_isoc_destructor; |
| 767 | atomic_inc(&g_submitted_isoc); |
| 768 | oz_event_log(OZ_EVT_TX_ISOC, nb_units, iso.frame_number, |
| 769 | skb, atomic_read(&g_submitted_isoc)); |
| 770 | if (dev_queue_xmit(skb) < 0) |
| 771 | return -1; |
| 772 | } else { |
| 773 | oz_event_log(OZ_EVT_TX_ISOC_DROP, 0, 0, 0, 0); |
| 774 | kfree_skb(skb); |
| 775 | } |
| 776 | } |
| 777 | return 0; |
| 778 | } |
| 779 | /*------------------------------------------------------------------------------ |
| 780 | * Context: process |
| 781 | */ |
| 782 | void oz_apps_init(void) |
| 783 | { |
| 784 | int i; |
| 785 | for (i = 0; i < OZ_APPID_MAX; i++) |
| 786 | if (g_app_if[i].init) |
| 787 | g_app_if[i].init(); |
| 788 | } |
| 789 | /*------------------------------------------------------------------------------ |
| 790 | * Context: process |
| 791 | */ |
| 792 | void oz_apps_term(void) |
| 793 | { |
| 794 | int i; |
| 795 | /* Terminate all the apps. */ |
| 796 | for (i = 0; i < OZ_APPID_MAX; i++) |
| 797 | if (g_app_if[i].term) |
| 798 | g_app_if[i].term(); |
| 799 | } |
| 800 | /*------------------------------------------------------------------------------ |
| 801 | * Context: softirq-serialized |
| 802 | */ |
| 803 | void oz_handle_app_elt(struct oz_pd *pd, u8 app_id, struct oz_elt *elt) |
| 804 | { |
| 805 | struct oz_app_if *ai; |
Dan Carpenter | 92a6253 | 2012-03-02 09:59:55 +0300 | [diff] [blame] | 806 | if (app_id == 0 || app_id > OZ_APPID_MAX) |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 807 | return; |
| 808 | ai = &g_app_if[app_id-1]; |
| 809 | ai->rx(pd, elt); |
| 810 | } |
| 811 | /*------------------------------------------------------------------------------ |
| 812 | * Context: softirq or process |
| 813 | */ |
| 814 | void oz_pd_indicate_farewells(struct oz_pd *pd) |
| 815 | { |
| 816 | struct oz_farewell *f; |
| 817 | struct oz_app_if *ai = &g_app_if[OZ_APPID_USB-1]; |
| 818 | while (1) { |
| 819 | oz_polling_lock_bh(); |
| 820 | if (list_empty(&pd->farewell_list)) { |
| 821 | oz_polling_unlock_bh(); |
| 822 | break; |
| 823 | } |
| 824 | f = list_first_entry(&pd->farewell_list, |
| 825 | struct oz_farewell, link); |
| 826 | list_del(&f->link); |
| 827 | oz_polling_unlock_bh(); |
| 828 | if (ai->farewell) |
| 829 | ai->farewell(pd, f->ep_num, f->report, f->len); |
Greg Kroah-Hartman | 1ec41a3 | 2012-03-02 16:51:09 -0800 | [diff] [blame] | 830 | kfree(f); |
Chris Kelly | bc3157d | 2012-02-20 21:11:37 +0000 | [diff] [blame] | 831 | } |
| 832 | } |