1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * This file is part of wl1251 4 * 5 * Copyright (c) 1998-2007 Texas Instruments Incorporated 6 * Copyright (C) 2008 Nokia Corporation 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 12 #include "wl1251.h" 13 #include "reg.h" 14 #include "tx.h" 15 #include "ps.h" 16 #include "io.h" 17 #include "event.h" 18 19 static bool wl1251_tx_double_buffer_busy(struct wl1251 *wl, u32 data_out_count) 20 { 21 int used, data_in_count; 22 23 data_in_count = wl->data_in_count; 24 25 if (data_in_count < data_out_count) 26 /* data_in_count has wrapped */ 27 data_in_count += TX_STATUS_DATA_OUT_COUNT_MASK + 1; 28 29 used = data_in_count - data_out_count; 30 31 WARN_ON(used < 0); 32 WARN_ON(used > DP_TX_PACKET_RING_CHUNK_NUM); 33 34 if (used >= DP_TX_PACKET_RING_CHUNK_NUM) 35 return true; 36 else 37 return false; 38 } 39 40 static int wl1251_tx_path_status(struct wl1251 *wl) 41 { 42 u32 status, addr, data_out_count; 43 bool busy; 44 45 addr = wl->data_path->tx_control_addr; 46 status = wl1251_mem_read32(wl, addr); 47 data_out_count = status & TX_STATUS_DATA_OUT_COUNT_MASK; 48 busy = wl1251_tx_double_buffer_busy(wl, data_out_count); 49 50 if (busy) 51 return -EBUSY; 52 53 return 0; 54 } 55 56 static int wl1251_tx_id(struct wl1251 *wl, struct sk_buff *skb) 57 { 58 int i; 59 60 for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++) 61 if (wl->tx_frames[i] == NULL) { 62 wl->tx_frames[i] = skb; 63 return i; 64 } 65 66 return -EBUSY; 67 } 68 69 static void wl1251_tx_control(struct tx_double_buffer_desc *tx_hdr, 70 struct ieee80211_tx_info *control, u16 fc) 71 { 72 *(u16 *)&tx_hdr->control = 0; 73 74 tx_hdr->control.rate_policy = 0; 75 76 /* 802.11 packets */ 77 tx_hdr->control.packet_type = 0; 78 79 /* Also disable retry and ACK policy for injected packets */ 80 if ((control->flags & IEEE80211_TX_CTL_NO_ACK) || 81 (control->flags & IEEE80211_TX_CTL_INJECTED)) { 82 tx_hdr->control.rate_policy = 1; 83 tx_hdr->control.ack_policy = 1; 84 } 85 86 tx_hdr->control.tx_complete = 1; 87 88 if ((fc & IEEE80211_FTYPE_DATA) && 89 ((fc & IEEE80211_STYPE_QOS_DATA) || 90 (fc & IEEE80211_STYPE_QOS_NULLFUNC))) 91 tx_hdr->control.qos = 1; 92 } 93 94 /* RSN + MIC = 8 + 8 = 16 bytes (worst case - AES). */ 95 #define MAX_MSDU_SECURITY_LENGTH 16 96 #define MAX_MPDU_SECURITY_LENGTH 16 97 #define WLAN_QOS_HDR_LEN 26 98 #define MAX_MPDU_HEADER_AND_SECURITY (MAX_MPDU_SECURITY_LENGTH + \ 99 WLAN_QOS_HDR_LEN) 100 #define HW_BLOCK_SIZE 252 101 static void wl1251_tx_frag_block_num(struct tx_double_buffer_desc *tx_hdr) 102 { 103 u16 payload_len, frag_threshold, mem_blocks; 104 u16 num_mpdus, mem_blocks_per_frag; 105 106 frag_threshold = IEEE80211_MAX_FRAG_THRESHOLD; 107 tx_hdr->frag_threshold = cpu_to_le16(frag_threshold); 108 109 payload_len = le16_to_cpu(tx_hdr->length) + MAX_MSDU_SECURITY_LENGTH; 110 111 if (payload_len > frag_threshold) { 112 mem_blocks_per_frag = 113 ((frag_threshold + MAX_MPDU_HEADER_AND_SECURITY) / 114 HW_BLOCK_SIZE) + 1; 115 num_mpdus = payload_len / frag_threshold; 116 mem_blocks = num_mpdus * mem_blocks_per_frag; 117 payload_len -= num_mpdus * frag_threshold; 118 num_mpdus++; 119 120 } else { 121 mem_blocks_per_frag = 0; 122 mem_blocks = 0; 123 num_mpdus = 1; 124 } 125 126 mem_blocks += (payload_len / HW_BLOCK_SIZE) + 1; 127 128 if (num_mpdus > 1) 129 mem_blocks += min(num_mpdus, mem_blocks_per_frag); 130 131 tx_hdr->num_mem_blocks = mem_blocks; 132 } 133 134 static int wl1251_tx_fill_hdr(struct wl1251 *wl, struct sk_buff *skb, 135 struct ieee80211_tx_info *control) 136 { 137 struct tx_double_buffer_desc *tx_hdr; 138 struct ieee80211_rate *rate; 139 int id; 140 u16 fc; 141 142 if (!skb) 143 return -EINVAL; 144 145 id = wl1251_tx_id(wl, skb); 146 if (id < 0) 147 return id; 148 149 fc = *(u16 *)skb->data; 150 tx_hdr = skb_push(skb, sizeof(*tx_hdr)); 151 152 tx_hdr->length = cpu_to_le16(skb->len - sizeof(*tx_hdr)); 153 rate = ieee80211_get_tx_rate(wl->hw, control); 154 tx_hdr->rate = cpu_to_le16(rate->hw_value); 155 tx_hdr->expiry_time = cpu_to_le32(1 << 16); 156 tx_hdr->id = id; 157 158 tx_hdr->xmit_queue = wl1251_tx_get_queue(skb_get_queue_mapping(skb)); 159 160 wl1251_tx_control(tx_hdr, control, fc); 161 wl1251_tx_frag_block_num(tx_hdr); 162 163 return 0; 164 } 165 166 /* We copy the packet to the target */ 167 static int wl1251_tx_send_packet(struct wl1251 *wl, struct sk_buff *skb, 168 struct ieee80211_tx_info *control) 169 { 170 struct tx_double_buffer_desc *tx_hdr; 171 int len; 172 u32 addr; 173 174 if (!skb) 175 return -EINVAL; 176 177 tx_hdr = (struct tx_double_buffer_desc *) skb->data; 178 179 if (control->control.hw_key && 180 control->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) { 181 int hdrlen; 182 __le16 fc; 183 u16 length; 184 u8 *pos; 185 186 fc = *(__le16 *)(skb->data + sizeof(*tx_hdr)); 187 length = le16_to_cpu(tx_hdr->length) + WL1251_TKIP_IV_SPACE; 188 tx_hdr->length = cpu_to_le16(length); 189 190 hdrlen = ieee80211_hdrlen(fc); 191 192 pos = skb_push(skb, WL1251_TKIP_IV_SPACE); 193 memmove(pos, pos + WL1251_TKIP_IV_SPACE, 194 sizeof(*tx_hdr) + hdrlen); 195 } 196 197 /* Revisit. This is a workaround for getting non-aligned packets. 198 This happens at least with EAPOL packets from the user space. 199 Our DMA requires packets to be aligned on a 4-byte boundary. 200 */ 201 if (unlikely((long)skb->data & 0x03)) { 202 int offset = (4 - (long)skb->data) & 0x03; 203 wl1251_debug(DEBUG_TX, "skb offset %d", offset); 204 205 /* check whether the current skb can be used */ 206 if (skb_cloned(skb) || (skb_tailroom(skb) < offset)) { 207 struct sk_buff *newskb = skb_copy_expand(skb, 0, 3, 208 GFP_KERNEL); 209 210 if (unlikely(newskb == NULL)) 211 return -EINVAL; 212 213 tx_hdr = (struct tx_double_buffer_desc *) newskb->data; 214 215 dev_kfree_skb_any(skb); 216 wl->tx_frames[tx_hdr->id] = skb = newskb; 217 218 offset = (4 - (long)skb->data) & 0x03; 219 wl1251_debug(DEBUG_TX, "new skb offset %d", offset); 220 } 221 222 /* align the buffer on a 4-byte boundary */ 223 if (offset) { 224 unsigned char *src = skb->data; 225 skb_reserve(skb, offset); 226 memmove(skb->data, src, skb->len); 227 tx_hdr = (struct tx_double_buffer_desc *) skb->data; 228 } 229 } 230 231 /* Our skb->data at this point includes the HW header */ 232 len = WL1251_TX_ALIGN(skb->len); 233 234 if (wl->data_in_count & 0x1) 235 addr = wl->data_path->tx_packet_ring_addr + 236 wl->data_path->tx_packet_ring_chunk_size; 237 else 238 addr = wl->data_path->tx_packet_ring_addr; 239 240 wl1251_mem_write(wl, addr, skb->data, len); 241 242 wl1251_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u rate 0x%x " 243 "queue %d", tx_hdr->id, skb, tx_hdr->length, 244 tx_hdr->rate, tx_hdr->xmit_queue); 245 246 return 0; 247 } 248 249 static void wl1251_tx_trigger(struct wl1251 *wl) 250 { 251 u32 data, addr; 252 253 if (wl->data_in_count & 0x1) { 254 addr = ACX_REG_INTERRUPT_TRIG_H; 255 data = INTR_TRIG_TX_PROC1; 256 } else { 257 addr = ACX_REG_INTERRUPT_TRIG; 258 data = INTR_TRIG_TX_PROC0; 259 } 260 261 wl1251_reg_write32(wl, addr, data); 262 263 /* Bumping data in */ 264 wl->data_in_count = (wl->data_in_count + 1) & 265 TX_STATUS_DATA_OUT_COUNT_MASK; 266 } 267 268 static void enable_tx_for_packet_injection(struct wl1251 *wl) 269 { 270 int ret; 271 272 ret = wl1251_cmd_join(wl, BSS_TYPE_STA_BSS, wl->channel, 273 wl->beacon_int, wl->dtim_period); 274 if (ret < 0) { 275 wl1251_warning("join failed"); 276 return; 277 } 278 279 ret = wl1251_event_wait(wl, JOIN_EVENT_COMPLETE_ID, 100); 280 if (ret < 0) { 281 wl1251_warning("join timeout"); 282 return; 283 } 284 285 wl->joined = true; 286 } 287 288 /* caller must hold wl->mutex */ 289 static int wl1251_tx_frame(struct wl1251 *wl, struct sk_buff *skb) 290 { 291 struct ieee80211_tx_info *info; 292 int ret = 0; 293 u8 idx; 294 295 info = IEEE80211_SKB_CB(skb); 296 297 if (info->control.hw_key) { 298 if (unlikely(wl->monitor_present)) 299 return -EINVAL; 300 301 idx = info->control.hw_key->hw_key_idx; 302 if (unlikely(wl->default_key != idx)) { 303 ret = wl1251_acx_default_key(wl, idx); 304 if (ret < 0) 305 return ret; 306 } 307 } 308 309 /* Enable tx path in monitor mode for packet injection */ 310 if ((wl->vif == NULL) && !wl->joined) 311 enable_tx_for_packet_injection(wl); 312 313 ret = wl1251_tx_path_status(wl); 314 if (ret < 0) 315 return ret; 316 317 ret = wl1251_tx_fill_hdr(wl, skb, info); 318 if (ret < 0) 319 return ret; 320 321 ret = wl1251_tx_send_packet(wl, skb, info); 322 if (ret < 0) 323 return ret; 324 325 wl1251_tx_trigger(wl); 326 327 return ret; 328 } 329 330 void wl1251_tx_work(struct work_struct *work) 331 { 332 struct wl1251 *wl = container_of(work, struct wl1251, tx_work); 333 struct sk_buff *skb; 334 bool woken_up = false; 335 int ret; 336 337 mutex_lock(&wl->mutex); 338 339 if (unlikely(wl->state == WL1251_STATE_OFF)) 340 goto out; 341 342 while ((skb = skb_dequeue(&wl->tx_queue))) { 343 if (!woken_up) { 344 ret = wl1251_ps_elp_wakeup(wl); 345 if (ret < 0) 346 goto out; 347 woken_up = true; 348 } 349 350 ret = wl1251_tx_frame(wl, skb); 351 if (ret == -EBUSY) { 352 skb_queue_head(&wl->tx_queue, skb); 353 goto out; 354 } else if (ret < 0) { 355 dev_kfree_skb(skb); 356 goto out; 357 } 358 } 359 360 out: 361 if (woken_up) 362 wl1251_ps_elp_sleep(wl); 363 364 mutex_unlock(&wl->mutex); 365 } 366 367 static const char *wl1251_tx_parse_status(u8 status) 368 { 369 /* 8 bit status field, one character per bit plus null */ 370 static char buf[9]; 371 int i = 0; 372 373 memset(buf, 0, sizeof(buf)); 374 375 if (status & TX_DMA_ERROR) 376 buf[i++] = 'm'; 377 if (status & TX_DISABLED) 378 buf[i++] = 'd'; 379 if (status & TX_RETRY_EXCEEDED) 380 buf[i++] = 'r'; 381 if (status & TX_TIMEOUT) 382 buf[i++] = 't'; 383 if (status & TX_KEY_NOT_FOUND) 384 buf[i++] = 'k'; 385 if (status & TX_ENCRYPT_FAIL) 386 buf[i++] = 'e'; 387 if (status & TX_UNAVAILABLE_PRIORITY) 388 buf[i++] = 'p'; 389 390 /* bit 0 is unused apparently */ 391 392 return buf; 393 } 394 395 static void wl1251_tx_packet_cb(struct wl1251 *wl, 396 struct tx_result *result) 397 { 398 struct ieee80211_tx_info *info; 399 struct sk_buff *skb; 400 int hdrlen; 401 u8 *frame; 402 403 skb = wl->tx_frames[result->id]; 404 if (skb == NULL) { 405 wl1251_error("SKB for packet %d is NULL", result->id); 406 return; 407 } 408 409 info = IEEE80211_SKB_CB(skb); 410 411 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) && 412 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 413 (result->status == TX_SUCCESS)) 414 info->flags |= IEEE80211_TX_STAT_ACK; 415 416 info->status.rates[0].count = result->ack_failures + 1; 417 wl->stats.retry_count += result->ack_failures; 418 419 /* 420 * We have to remove our private TX header before pushing 421 * the skb back to mac80211. 422 */ 423 frame = skb_pull(skb, sizeof(struct tx_double_buffer_desc)); 424 if (info->control.hw_key && 425 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) { 426 hdrlen = ieee80211_get_hdrlen_from_skb(skb); 427 memmove(frame + WL1251_TKIP_IV_SPACE, frame, hdrlen); 428 skb_pull(skb, WL1251_TKIP_IV_SPACE); 429 } 430 431 wl1251_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x" 432 " status 0x%x (%s)", 433 result->id, skb, result->ack_failures, result->rate, 434 result->status, wl1251_tx_parse_status(result->status)); 435 436 437 ieee80211_tx_status(wl->hw, skb); 438 439 wl->tx_frames[result->id] = NULL; 440 } 441 442 /* Called upon reception of a TX complete interrupt */ 443 void wl1251_tx_complete(struct wl1251 *wl) 444 { 445 int i, result_index, num_complete = 0, queue_len; 446 struct tx_result *result, *result_ptr; 447 unsigned long flags; 448 449 if (unlikely(wl->state != WL1251_STATE_ON)) 450 return; 451 452 result = kmalloc_array(FW_TX_CMPLT_BLOCK_SIZE, sizeof(*result), GFP_KERNEL); 453 if (!result) { 454 wl1251_error("can not allocate result buffer"); 455 return; 456 } 457 458 /* First we read the result */ 459 wl1251_mem_read(wl, wl->data_path->tx_complete_addr, result, 460 FW_TX_CMPLT_BLOCK_SIZE * sizeof(*result)); 461 462 result_index = wl->next_tx_complete; 463 464 for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++) { 465 result_ptr = &result[result_index]; 466 467 if (result_ptr->done_1 == 1 && 468 result_ptr->done_2 == 1) { 469 wl1251_tx_packet_cb(wl, result_ptr); 470 471 result_ptr->done_1 = 0; 472 result_ptr->done_2 = 0; 473 474 result_index = (result_index + 1) & 475 (FW_TX_CMPLT_BLOCK_SIZE - 1); 476 num_complete++; 477 } else { 478 break; 479 } 480 } 481 482 queue_len = skb_queue_len(&wl->tx_queue); 483 484 if ((num_complete > 0) && (queue_len > 0)) { 485 /* firmware buffer has space, reschedule tx_work */ 486 wl1251_debug(DEBUG_TX, "tx_complete: reschedule tx_work"); 487 ieee80211_queue_work(wl->hw, &wl->tx_work); 488 } 489 490 if (wl->tx_queue_stopped && 491 queue_len <= WL1251_TX_QUEUE_LOW_WATERMARK) { 492 /* tx_queue has space, restart queues */ 493 wl1251_debug(DEBUG_TX, "tx_complete: waking queues"); 494 spin_lock_irqsave(&wl->wl_lock, flags); 495 ieee80211_wake_queues(wl->hw); 496 wl->tx_queue_stopped = false; 497 spin_unlock_irqrestore(&wl->wl_lock, flags); 498 } 499 500 /* Every completed frame needs to be acknowledged */ 501 if (num_complete) { 502 /* 503 * If we've wrapped, we have to clear 504 * the results in 2 steps. 505 */ 506 if (result_index > wl->next_tx_complete) { 507 /* Only 1 write is needed */ 508 wl1251_mem_write(wl, 509 wl->data_path->tx_complete_addr + 510 (wl->next_tx_complete * 511 sizeof(struct tx_result)), 512 &result[wl->next_tx_complete], 513 num_complete * 514 sizeof(struct tx_result)); 515 516 517 } else if (result_index < wl->next_tx_complete) { 518 /* 2 writes are needed */ 519 wl1251_mem_write(wl, 520 wl->data_path->tx_complete_addr + 521 (wl->next_tx_complete * 522 sizeof(struct tx_result)), 523 &result[wl->next_tx_complete], 524 (FW_TX_CMPLT_BLOCK_SIZE - 525 wl->next_tx_complete) * 526 sizeof(struct tx_result)); 527 528 wl1251_mem_write(wl, 529 wl->data_path->tx_complete_addr, 530 result, 531 (num_complete - 532 FW_TX_CMPLT_BLOCK_SIZE + 533 wl->next_tx_complete) * 534 sizeof(struct tx_result)); 535 536 } else { 537 /* We have to write the whole array */ 538 wl1251_mem_write(wl, 539 wl->data_path->tx_complete_addr, 540 result, 541 FW_TX_CMPLT_BLOCK_SIZE * 542 sizeof(struct tx_result)); 543 } 544 545 } 546 547 kfree(result); 548 wl->next_tx_complete = result_index; 549 } 550 551 /* caller must hold wl->mutex */ 552 void wl1251_tx_flush(struct wl1251 *wl) 553 { 554 int i; 555 struct sk_buff *skb; 556 struct ieee80211_tx_info *info; 557 558 /* TX failure */ 559 /* control->flags = 0; FIXME */ 560 561 while ((skb = skb_dequeue(&wl->tx_queue))) { 562 info = IEEE80211_SKB_CB(skb); 563 564 wl1251_debug(DEBUG_TX, "flushing skb 0x%p", skb); 565 566 if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)) 567 continue; 568 569 ieee80211_tx_status(wl->hw, skb); 570 } 571 572 for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++) 573 if (wl->tx_frames[i] != NULL) { 574 skb = wl->tx_frames[i]; 575 info = IEEE80211_SKB_CB(skb); 576 577 if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)) 578 continue; 579 580 ieee80211_tx_status(wl->hw, skb); 581 wl->tx_frames[i] = NULL; 582 } 583 } 584