1 /* 2 * This file is part of wl1271 3 * 4 * Copyright (C) 2009 Nokia Corporation 5 * 6 * Contact: Luciano Coelho <luciano.coelho@nokia.com> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * version 2 as published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 20 * 02110-1301 USA 21 * 22 */ 23 24 #include <linux/kernel.h> 25 #include <linux/module.h> 26 #include <linux/etherdevice.h> 27 28 #include "wlcore.h" 29 #include "debug.h" 30 #include "io.h" 31 #include "ps.h" 32 #include "tx.h" 33 #include "event.h" 34 #include "hw_ops.h" 35 36 /* 37 * TODO: this is here just for now, it must be removed when the data 38 * operations are in place. 39 */ 40 #include "../wl12xx/reg.h" 41 42 static int wl1271_set_default_wep_key(struct wl1271 *wl, 43 struct wl12xx_vif *wlvif, u8 id) 44 { 45 int ret; 46 bool is_ap = (wlvif->bss_type == BSS_TYPE_AP_BSS); 47 48 if (is_ap) 49 ret = wl12xx_cmd_set_default_wep_key(wl, id, 50 wlvif->ap.bcast_hlid); 51 else 52 ret = wl12xx_cmd_set_default_wep_key(wl, id, wlvif->sta.hlid); 53 54 if (ret < 0) 55 return ret; 56 57 wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id); 58 return 0; 59 } 60 61 static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb) 62 { 63 int id; 64 65 id = find_first_zero_bit(wl->tx_frames_map, wl->num_tx_desc); 66 if (id >= wl->num_tx_desc) 67 return -EBUSY; 68 69 __set_bit(id, wl->tx_frames_map); 70 wl->tx_frames[id] = skb; 71 wl->tx_frames_cnt++; 72 return id; 73 } 74 75 void wl1271_free_tx_id(struct wl1271 *wl, int id) 76 { 77 if (__test_and_clear_bit(id, wl->tx_frames_map)) { 78 if (unlikely(wl->tx_frames_cnt == wl->num_tx_desc)) 79 clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags); 80 81 wl->tx_frames[id] = NULL; 82 wl->tx_frames_cnt--; 83 } 84 } 85 EXPORT_SYMBOL(wl1271_free_tx_id); 86 87 static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl, 88 struct sk_buff *skb) 89 { 90 struct ieee80211_hdr *hdr; 91 92 /* 93 * add the station to the known list before transmitting the 94 * authentication response. this way it won't get de-authed by FW 95 * when transmitting too soon. 96 */ 97 hdr = (struct ieee80211_hdr *)(skb->data + 98 sizeof(struct wl1271_tx_hw_descr)); 99 if (ieee80211_is_auth(hdr->frame_control)) 100 wl1271_acx_set_inconnection_sta(wl, hdr->addr1); 101 } 102 103 static void wl1271_tx_regulate_link(struct wl1271 *wl, 104 struct wl12xx_vif *wlvif, 105 u8 hlid) 106 { 107 bool fw_ps, single_sta; 108 u8 tx_pkts; 109 110 if (WARN_ON(!test_bit(hlid, wlvif->links_map))) 111 return; 112 113 fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map); 114 tx_pkts = wl->links[hlid].allocated_pkts; 115 single_sta = (wl->active_sta_count == 1); 116 117 /* 118 * if in FW PS and there is enough data in FW we can put the link 119 * into high-level PS and clean out its TX queues. 120 * Make an exception if this is the only connected station. In this 121 * case FW-memory congestion is not a problem. 122 */ 123 if (!single_sta && fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS) 124 wl12xx_ps_link_start(wl, wlvif, hlid, true); 125 } 126 127 bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb) 128 { 129 return wl->dummy_packet == skb; 130 } 131 EXPORT_SYMBOL(wl12xx_is_dummy_packet); 132 133 u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif, 134 struct sk_buff *skb) 135 { 136 struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb); 137 138 if (control->control.sta) { 139 struct wl1271_station *wl_sta; 140 141 wl_sta = (struct wl1271_station *) 142 control->control.sta->drv_priv; 143 return wl_sta->hlid; 144 } else { 145 struct ieee80211_hdr *hdr; 146 147 if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags)) 148 return wl->system_hlid; 149 150 hdr = (struct ieee80211_hdr *)skb->data; 151 if (is_multicast_ether_addr(ieee80211_get_DA(hdr))) 152 return wlvif->ap.bcast_hlid; 153 else 154 return wlvif->ap.global_hlid; 155 } 156 } 157 158 u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif, 159 struct sk_buff *skb) 160 { 161 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 162 163 if (!wlvif || wl12xx_is_dummy_packet(wl, skb)) 164 return wl->system_hlid; 165 166 if (wlvif->bss_type == BSS_TYPE_AP_BSS) 167 return wl12xx_tx_get_hlid_ap(wl, wlvif, skb); 168 169 if ((test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags) || 170 test_bit(WLVIF_FLAG_IBSS_JOINED, &wlvif->flags)) && 171 !ieee80211_is_auth(hdr->frame_control) && 172 !ieee80211_is_assoc_req(hdr->frame_control)) 173 return wlvif->sta.hlid; 174 else 175 return wlvif->dev_hlid; 176 } 177 178 unsigned int wlcore_calc_packet_alignment(struct wl1271 *wl, 179 unsigned int packet_length) 180 { 181 if ((wl->quirks & WLCORE_QUIRK_TX_PAD_LAST_FRAME) || 182 !(wl->quirks & WLCORE_QUIRK_TX_BLOCKSIZE_ALIGN)) 183 return ALIGN(packet_length, WL1271_TX_ALIGN_TO); 184 else 185 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE); 186 } 187 EXPORT_SYMBOL(wlcore_calc_packet_alignment); 188 189 static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif, 190 struct sk_buff *skb, u32 extra, u32 buf_offset, 191 u8 hlid, bool is_gem) 192 { 193 struct wl1271_tx_hw_descr *desc; 194 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra; 195 u32 total_blocks; 196 int id, ret = -EBUSY, ac; 197 u32 spare_blocks; 198 199 if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE) 200 return -EAGAIN; 201 202 spare_blocks = wlcore_hw_get_spare_blocks(wl, is_gem); 203 204 /* allocate free identifier for the packet */ 205 id = wl1271_alloc_tx_id(wl, skb); 206 if (id < 0) 207 return id; 208 209 total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks); 210 211 if (total_blocks <= wl->tx_blocks_available) { 212 desc = (struct wl1271_tx_hw_descr *)skb_push( 213 skb, total_len - skb->len); 214 215 wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks, 216 spare_blocks); 217 218 desc->id = id; 219 220 wl->tx_blocks_available -= total_blocks; 221 wl->tx_allocated_blocks += total_blocks; 222 223 /* If the FW was empty before, arm the Tx watchdog */ 224 if (wl->tx_allocated_blocks == total_blocks) 225 wl12xx_rearm_tx_watchdog_locked(wl); 226 227 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); 228 wl->tx_allocated_pkts[ac]++; 229 230 if (!wl12xx_is_dummy_packet(wl, skb) && wlvif && 231 wlvif->bss_type == BSS_TYPE_AP_BSS && 232 test_bit(hlid, wlvif->ap.sta_hlid_map)) 233 wl->links[hlid].allocated_pkts++; 234 235 ret = 0; 236 237 wl1271_debug(DEBUG_TX, 238 "tx_allocate: size: %d, blocks: %d, id: %d", 239 total_len, total_blocks, id); 240 } else { 241 wl1271_free_tx_id(wl, id); 242 } 243 244 return ret; 245 } 246 247 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif, 248 struct sk_buff *skb, u32 extra, 249 struct ieee80211_tx_info *control, u8 hlid) 250 { 251 struct timespec ts; 252 struct wl1271_tx_hw_descr *desc; 253 int ac, rate_idx; 254 s64 hosttime; 255 u16 tx_attr = 0; 256 __le16 frame_control; 257 struct ieee80211_hdr *hdr; 258 u8 *frame_start; 259 bool is_dummy; 260 261 desc = (struct wl1271_tx_hw_descr *) skb->data; 262 frame_start = (u8 *)(desc + 1); 263 hdr = (struct ieee80211_hdr *)(frame_start + extra); 264 frame_control = hdr->frame_control; 265 266 /* relocate space for security header */ 267 if (extra) { 268 int hdrlen = ieee80211_hdrlen(frame_control); 269 memmove(frame_start, hdr, hdrlen); 270 skb_set_network_header(skb, skb_network_offset(skb) + extra); 271 } 272 273 /* configure packet life time */ 274 getnstimeofday(&ts); 275 hosttime = (timespec_to_ns(&ts) >> 10); 276 desc->start_time = cpu_to_le32(hosttime - wl->time_offset); 277 278 is_dummy = wl12xx_is_dummy_packet(wl, skb); 279 if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS) 280 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU); 281 else 282 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU); 283 284 /* queue */ 285 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); 286 desc->tid = skb->priority; 287 288 if (is_dummy) { 289 /* 290 * FW expects the dummy packet to have an invalid session id - 291 * any session id that is different than the one set in the join 292 */ 293 tx_attr = (SESSION_COUNTER_INVALID << 294 TX_HW_ATTR_OFST_SESSION_COUNTER) & 295 TX_HW_ATTR_SESSION_COUNTER; 296 297 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ; 298 } else if (wlvif) { 299 /* configure the tx attributes */ 300 tx_attr = wlvif->session_counter << 301 TX_HW_ATTR_OFST_SESSION_COUNTER; 302 } 303 304 desc->hlid = hlid; 305 if (is_dummy || !wlvif) 306 rate_idx = 0; 307 else if (wlvif->bss_type != BSS_TYPE_AP_BSS) { 308 /* 309 * if the packets are data packets 310 * send them with AP rate policies (EAPOLs are an exception), 311 * otherwise use default basic rates 312 */ 313 if (skb->protocol == cpu_to_be16(ETH_P_PAE)) 314 rate_idx = wlvif->sta.basic_rate_idx; 315 else if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE) 316 rate_idx = wlvif->sta.p2p_rate_idx; 317 else if (ieee80211_is_data(frame_control)) 318 rate_idx = wlvif->sta.ap_rate_idx; 319 else 320 rate_idx = wlvif->sta.basic_rate_idx; 321 } else { 322 if (hlid == wlvif->ap.global_hlid) 323 rate_idx = wlvif->ap.mgmt_rate_idx; 324 else if (hlid == wlvif->ap.bcast_hlid || 325 skb->protocol == cpu_to_be16(ETH_P_PAE)) 326 /* send AP bcast and EAPOLs using the min basic rate */ 327 rate_idx = wlvif->ap.bcast_rate_idx; 328 else 329 rate_idx = wlvif->ap.ucast_rate_idx[ac]; 330 } 331 332 tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY; 333 334 /* for WEP shared auth - no fw encryption is needed */ 335 if (ieee80211_is_auth(frame_control) && 336 ieee80211_has_protected(frame_control)) 337 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT; 338 339 desc->tx_attr = cpu_to_le16(tx_attr); 340 341 wlcore_hw_set_tx_desc_csum(wl, desc, skb); 342 wlcore_hw_set_tx_desc_data_len(wl, desc, skb); 343 } 344 345 /* caller must hold wl->mutex */ 346 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif, 347 struct sk_buff *skb, u32 buf_offset) 348 { 349 struct ieee80211_tx_info *info; 350 u32 extra = 0; 351 int ret = 0; 352 u32 total_len; 353 u8 hlid; 354 bool is_dummy; 355 bool is_gem = false; 356 357 if (!skb) { 358 wl1271_error("discarding null skb"); 359 return -EINVAL; 360 } 361 362 info = IEEE80211_SKB_CB(skb); 363 364 /* TODO: handle dummy packets on multi-vifs */ 365 is_dummy = wl12xx_is_dummy_packet(wl, skb); 366 367 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) && 368 info->control.hw_key && 369 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) 370 extra = WL1271_EXTRA_SPACE_TKIP; 371 372 if (info->control.hw_key) { 373 bool is_wep; 374 u8 idx = info->control.hw_key->hw_key_idx; 375 u32 cipher = info->control.hw_key->cipher; 376 377 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) || 378 (cipher == WLAN_CIPHER_SUITE_WEP104); 379 380 if (unlikely(is_wep && wlvif->default_key != idx)) { 381 ret = wl1271_set_default_wep_key(wl, wlvif, idx); 382 if (ret < 0) 383 return ret; 384 wlvif->default_key = idx; 385 } 386 387 is_gem = (cipher == WL1271_CIPHER_SUITE_GEM); 388 } 389 hlid = wl12xx_tx_get_hlid(wl, wlvif, skb); 390 if (hlid == WL12XX_INVALID_LINK_ID) { 391 wl1271_error("invalid hlid. dropping skb 0x%p", skb); 392 return -EINVAL; 393 } 394 395 ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid, 396 is_gem); 397 if (ret < 0) 398 return ret; 399 400 wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid); 401 402 if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) { 403 wl1271_tx_ap_update_inconnection_sta(wl, skb); 404 wl1271_tx_regulate_link(wl, wlvif, hlid); 405 } 406 407 /* 408 * The length of each packet is stored in terms of 409 * words. Thus, we must pad the skb data to make sure its 410 * length is aligned. The number of padding bytes is computed 411 * and set in wl1271_tx_fill_hdr. 412 * In special cases, we want to align to a specific block size 413 * (eg. for wl128x with SDIO we align to 256). 414 */ 415 total_len = wlcore_calc_packet_alignment(wl, skb->len); 416 417 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len); 418 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len); 419 420 /* Revert side effects in the dummy packet skb, so it can be reused */ 421 if (is_dummy) 422 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr)); 423 424 return total_len; 425 } 426 427 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set, 428 enum ieee80211_band rate_band) 429 { 430 struct ieee80211_supported_band *band; 431 u32 enabled_rates = 0; 432 int bit; 433 434 band = wl->hw->wiphy->bands[rate_band]; 435 for (bit = 0; bit < band->n_bitrates; bit++) { 436 if (rate_set & 0x1) 437 enabled_rates |= band->bitrates[bit].hw_value; 438 rate_set >>= 1; 439 } 440 441 /* MCS rates indication are on bits 16 - 31 */ 442 rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates; 443 444 for (bit = 0; bit < 16; bit++) { 445 if (rate_set & 0x1) 446 enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit); 447 rate_set >>= 1; 448 } 449 450 return enabled_rates; 451 } 452 453 void wl1271_handle_tx_low_watermark(struct wl1271 *wl) 454 { 455 int i; 456 457 for (i = 0; i < NUM_TX_QUEUES; i++) { 458 if (wlcore_is_queue_stopped_by_reason(wl, i, 459 WLCORE_QUEUE_STOP_REASON_WATERMARK) && 460 wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) { 461 /* firmware buffer has space, restart queues */ 462 wlcore_wake_queue(wl, i, 463 WLCORE_QUEUE_STOP_REASON_WATERMARK); 464 } 465 } 466 } 467 468 static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl, 469 struct sk_buff_head *queues) 470 { 471 int i, q = -1, ac; 472 u32 min_pkts = 0xffffffff; 473 474 /* 475 * Find a non-empty ac where: 476 * 1. There are packets to transmit 477 * 2. The FW has the least allocated blocks 478 * 479 * We prioritize the ACs according to VO>VI>BE>BK 480 */ 481 for (i = 0; i < NUM_TX_QUEUES; i++) { 482 ac = wl1271_tx_get_queue(i); 483 if (!skb_queue_empty(&queues[ac]) && 484 (wl->tx_allocated_pkts[ac] < min_pkts)) { 485 q = ac; 486 min_pkts = wl->tx_allocated_pkts[q]; 487 } 488 } 489 490 if (q == -1) 491 return NULL; 492 493 return &queues[q]; 494 } 495 496 static struct sk_buff *wl12xx_lnk_skb_dequeue(struct wl1271 *wl, 497 struct wl1271_link *lnk) 498 { 499 struct sk_buff *skb; 500 unsigned long flags; 501 struct sk_buff_head *queue; 502 503 queue = wl1271_select_queue(wl, lnk->tx_queue); 504 if (!queue) 505 return NULL; 506 507 skb = skb_dequeue(queue); 508 if (skb) { 509 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); 510 spin_lock_irqsave(&wl->wl_lock, flags); 511 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0); 512 wl->tx_queue_count[q]--; 513 spin_unlock_irqrestore(&wl->wl_lock, flags); 514 } 515 516 return skb; 517 } 518 519 static struct sk_buff *wl12xx_vif_skb_dequeue(struct wl1271 *wl, 520 struct wl12xx_vif *wlvif) 521 { 522 struct sk_buff *skb = NULL; 523 int i, h, start_hlid; 524 525 /* start from the link after the last one */ 526 start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS; 527 528 /* dequeue according to AC, round robin on each link */ 529 for (i = 0; i < WL12XX_MAX_LINKS; i++) { 530 h = (start_hlid + i) % WL12XX_MAX_LINKS; 531 532 /* only consider connected stations */ 533 if (!test_bit(h, wlvif->links_map)) 534 continue; 535 536 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[h]); 537 if (!skb) 538 continue; 539 540 wlvif->last_tx_hlid = h; 541 break; 542 } 543 544 if (!skb) 545 wlvif->last_tx_hlid = 0; 546 547 return skb; 548 } 549 550 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl) 551 { 552 unsigned long flags; 553 struct wl12xx_vif *wlvif = wl->last_wlvif; 554 struct sk_buff *skb = NULL; 555 556 /* continue from last wlvif (round robin) */ 557 if (wlvif) { 558 wl12xx_for_each_wlvif_continue(wl, wlvif) { 559 skb = wl12xx_vif_skb_dequeue(wl, wlvif); 560 if (skb) { 561 wl->last_wlvif = wlvif; 562 break; 563 } 564 } 565 } 566 567 /* dequeue from the system HLID before the restarting wlvif list */ 568 if (!skb) 569 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[wl->system_hlid]); 570 571 /* do a new pass over the wlvif list */ 572 if (!skb) { 573 wl12xx_for_each_wlvif(wl, wlvif) { 574 skb = wl12xx_vif_skb_dequeue(wl, wlvif); 575 if (skb) { 576 wl->last_wlvif = wlvif; 577 break; 578 } 579 580 /* 581 * No need to continue after last_wlvif. The previous 582 * pass should have found it. 583 */ 584 if (wlvif == wl->last_wlvif) 585 break; 586 } 587 } 588 589 if (!skb && 590 test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) { 591 int q; 592 593 skb = wl->dummy_packet; 594 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); 595 spin_lock_irqsave(&wl->wl_lock, flags); 596 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0); 597 wl->tx_queue_count[q]--; 598 spin_unlock_irqrestore(&wl->wl_lock, flags); 599 } 600 601 return skb; 602 } 603 604 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif, 605 struct sk_buff *skb) 606 { 607 unsigned long flags; 608 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); 609 610 if (wl12xx_is_dummy_packet(wl, skb)) { 611 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags); 612 } else { 613 u8 hlid = wl12xx_tx_get_hlid(wl, wlvif, skb); 614 skb_queue_head(&wl->links[hlid].tx_queue[q], skb); 615 616 /* make sure we dequeue the same packet next time */ 617 wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) % 618 WL12XX_MAX_LINKS; 619 } 620 621 spin_lock_irqsave(&wl->wl_lock, flags); 622 wl->tx_queue_count[q]++; 623 spin_unlock_irqrestore(&wl->wl_lock, flags); 624 } 625 626 static bool wl1271_tx_is_data_present(struct sk_buff *skb) 627 { 628 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data); 629 630 return ieee80211_is_data_present(hdr->frame_control); 631 } 632 633 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids) 634 { 635 struct wl12xx_vif *wlvif; 636 u32 timeout; 637 u8 hlid; 638 639 if (!wl->conf.rx_streaming.interval) 640 return; 641 642 if (!wl->conf.rx_streaming.always && 643 !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags)) 644 return; 645 646 timeout = wl->conf.rx_streaming.duration; 647 wl12xx_for_each_wlvif_sta(wl, wlvif) { 648 bool found = false; 649 for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) { 650 if (test_bit(hlid, wlvif->links_map)) { 651 found = true; 652 break; 653 } 654 } 655 656 if (!found) 657 continue; 658 659 /* enable rx streaming */ 660 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags)) 661 ieee80211_queue_work(wl->hw, 662 &wlvif->rx_streaming_enable_work); 663 664 mod_timer(&wlvif->rx_streaming_timer, 665 jiffies + msecs_to_jiffies(timeout)); 666 } 667 } 668 669 /* 670 * Returns failure values only in case of failed bus ops within this function. 671 * wl1271_prepare_tx_frame retvals won't be returned in order to avoid 672 * triggering recovery by higher layers when not necessary. 673 * In case a FW command fails within wl1271_prepare_tx_frame fails a recovery 674 * will be queued in wl1271_cmd_send. -EAGAIN/-EBUSY from prepare_tx_frame 675 * can occur and are legitimate so don't propagate. -EINVAL will emit a WARNING 676 * within prepare_tx_frame code but there's nothing we should do about those 677 * as well. 678 */ 679 int wlcore_tx_work_locked(struct wl1271 *wl) 680 { 681 struct wl12xx_vif *wlvif; 682 struct sk_buff *skb; 683 struct wl1271_tx_hw_descr *desc; 684 u32 buf_offset = 0, last_len = 0; 685 bool sent_packets = false; 686 unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0}; 687 int ret = 0; 688 int bus_ret = 0; 689 690 if (unlikely(wl->state == WL1271_STATE_OFF)) 691 return 0; 692 693 while ((skb = wl1271_skb_dequeue(wl))) { 694 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 695 bool has_data = false; 696 697 wlvif = NULL; 698 if (!wl12xx_is_dummy_packet(wl, skb) && info->control.vif) 699 wlvif = wl12xx_vif_to_data(info->control.vif); 700 701 has_data = wlvif && wl1271_tx_is_data_present(skb); 702 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset); 703 if (ret == -EAGAIN) { 704 /* 705 * Aggregation buffer is full. 706 * Flush buffer and try again. 707 */ 708 wl1271_skb_queue_head(wl, wlvif, skb); 709 710 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, 711 last_len); 712 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA, 713 wl->aggr_buf, buf_offset, true); 714 if (bus_ret < 0) 715 goto out; 716 717 sent_packets = true; 718 buf_offset = 0; 719 continue; 720 } else if (ret == -EBUSY) { 721 /* 722 * Firmware buffer is full. 723 * Queue back last skb, and stop aggregating. 724 */ 725 wl1271_skb_queue_head(wl, wlvif, skb); 726 /* No work left, avoid scheduling redundant tx work */ 727 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags); 728 goto out_ack; 729 } else if (ret < 0) { 730 if (wl12xx_is_dummy_packet(wl, skb)) 731 /* 732 * fw still expects dummy packet, 733 * so re-enqueue it 734 */ 735 wl1271_skb_queue_head(wl, wlvif, skb); 736 else 737 ieee80211_free_txskb(wl->hw, skb); 738 goto out_ack; 739 } 740 last_len = ret; 741 buf_offset += last_len; 742 wl->tx_packets_count++; 743 if (has_data) { 744 desc = (struct wl1271_tx_hw_descr *) skb->data; 745 __set_bit(desc->hlid, active_hlids); 746 } 747 } 748 749 out_ack: 750 if (buf_offset) { 751 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len); 752 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf, 753 buf_offset, true); 754 if (bus_ret < 0) 755 goto out; 756 757 sent_packets = true; 758 } 759 if (sent_packets) { 760 /* 761 * Interrupt the firmware with the new packets. This is only 762 * required for older hardware revisions 763 */ 764 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) { 765 bus_ret = wlcore_write32(wl, WL12XX_HOST_WR_ACCESS, 766 wl->tx_packets_count); 767 if (bus_ret < 0) 768 goto out; 769 } 770 771 wl1271_handle_tx_low_watermark(wl); 772 } 773 wl12xx_rearm_rx_streaming(wl, active_hlids); 774 775 out: 776 return bus_ret; 777 } 778 779 void wl1271_tx_work(struct work_struct *work) 780 { 781 struct wl1271 *wl = container_of(work, struct wl1271, tx_work); 782 int ret; 783 784 mutex_lock(&wl->mutex); 785 ret = wl1271_ps_elp_wakeup(wl); 786 if (ret < 0) 787 goto out; 788 789 ret = wlcore_tx_work_locked(wl); 790 if (ret < 0) { 791 wl12xx_queue_recovery_work(wl); 792 goto out; 793 } 794 795 wl1271_ps_elp_sleep(wl); 796 out: 797 mutex_unlock(&wl->mutex); 798 } 799 800 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index) 801 { 802 u8 flags = 0; 803 804 /* 805 * TODO: use wl12xx constants when this code is moved to wl12xx, as 806 * only it uses Tx-completion. 807 */ 808 if (rate_class_index <= 8) 809 flags |= IEEE80211_TX_RC_MCS; 810 811 /* 812 * TODO: use wl12xx constants when this code is moved to wl12xx, as 813 * only it uses Tx-completion. 814 */ 815 if (rate_class_index == 0) 816 flags |= IEEE80211_TX_RC_SHORT_GI; 817 818 return flags; 819 } 820 821 static void wl1271_tx_complete_packet(struct wl1271 *wl, 822 struct wl1271_tx_hw_res_descr *result) 823 { 824 struct ieee80211_tx_info *info; 825 struct ieee80211_vif *vif; 826 struct wl12xx_vif *wlvif; 827 struct sk_buff *skb; 828 int id = result->id; 829 int rate = -1; 830 u8 rate_flags = 0; 831 u8 retries = 0; 832 833 /* check for id legality */ 834 if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) { 835 wl1271_warning("TX result illegal id: %d", id); 836 return; 837 } 838 839 skb = wl->tx_frames[id]; 840 info = IEEE80211_SKB_CB(skb); 841 842 if (wl12xx_is_dummy_packet(wl, skb)) { 843 wl1271_free_tx_id(wl, id); 844 return; 845 } 846 847 /* info->control is valid as long as we don't update info->status */ 848 vif = info->control.vif; 849 wlvif = wl12xx_vif_to_data(vif); 850 851 /* update the TX status info */ 852 if (result->status == TX_SUCCESS) { 853 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) 854 info->flags |= IEEE80211_TX_STAT_ACK; 855 rate = wlcore_rate_to_idx(wl, result->rate_class_index, 856 wlvif->band); 857 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index); 858 retries = result->ack_failures; 859 } else if (result->status == TX_RETRY_EXCEEDED) { 860 wl->stats.excessive_retries++; 861 retries = result->ack_failures; 862 } 863 864 info->status.rates[0].idx = rate; 865 info->status.rates[0].count = retries; 866 info->status.rates[0].flags = rate_flags; 867 info->status.ack_signal = -1; 868 869 wl->stats.retry_count += result->ack_failures; 870 871 /* 872 * update sequence number only when relevant, i.e. only in 873 * sessions of TKIP, AES and GEM (not in open or WEP sessions) 874 */ 875 if (info->control.hw_key && 876 (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP || 877 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP || 878 info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) { 879 u8 fw_lsb = result->tx_security_sequence_number_lsb; 880 u8 cur_lsb = wlvif->tx_security_last_seq_lsb; 881 882 /* 883 * update security sequence number, taking care of potential 884 * wrap-around 885 */ 886 wlvif->tx_security_seq += (fw_lsb - cur_lsb) & 0xff; 887 wlvif->tx_security_last_seq_lsb = fw_lsb; 888 } 889 890 /* remove private header from packet */ 891 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr)); 892 893 /* remove TKIP header space if present */ 894 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) && 895 info->control.hw_key && 896 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) { 897 int hdrlen = ieee80211_get_hdrlen_from_skb(skb); 898 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data, 899 hdrlen); 900 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP); 901 } 902 903 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x" 904 " status 0x%x", 905 result->id, skb, result->ack_failures, 906 result->rate_class_index, result->status); 907 908 /* return the packet to the stack */ 909 skb_queue_tail(&wl->deferred_tx_queue, skb); 910 queue_work(wl->freezable_wq, &wl->netstack_work); 911 wl1271_free_tx_id(wl, result->id); 912 } 913 914 /* Called upon reception of a TX complete interrupt */ 915 int wlcore_tx_complete(struct wl1271 *wl) 916 { 917 struct wl1271_acx_mem_map *memmap = wl->target_mem_map; 918 u32 count, fw_counter; 919 u32 i; 920 int ret; 921 922 /* read the tx results from the chipset */ 923 ret = wlcore_read(wl, le32_to_cpu(memmap->tx_result), 924 wl->tx_res_if, sizeof(*wl->tx_res_if), false); 925 if (ret < 0) 926 goto out; 927 928 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter); 929 930 /* write host counter to chipset (to ack) */ 931 ret = wlcore_write32(wl, le32_to_cpu(memmap->tx_result) + 932 offsetof(struct wl1271_tx_hw_res_if, 933 tx_result_host_counter), fw_counter); 934 if (ret < 0) 935 goto out; 936 937 count = fw_counter - wl->tx_results_count; 938 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count); 939 940 /* verify that the result buffer is not getting overrun */ 941 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN)) 942 wl1271_warning("TX result overflow from chipset: %d", count); 943 944 /* process the results */ 945 for (i = 0; i < count; i++) { 946 struct wl1271_tx_hw_res_descr *result; 947 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK; 948 949 /* process the packet */ 950 result = &(wl->tx_res_if->tx_results_queue[offset]); 951 wl1271_tx_complete_packet(wl, result); 952 953 wl->tx_results_count++; 954 } 955 956 out: 957 return ret; 958 } 959 EXPORT_SYMBOL(wlcore_tx_complete); 960 961 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid) 962 { 963 struct sk_buff *skb; 964 int i; 965 unsigned long flags; 966 struct ieee80211_tx_info *info; 967 int total[NUM_TX_QUEUES]; 968 969 for (i = 0; i < NUM_TX_QUEUES; i++) { 970 total[i] = 0; 971 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) { 972 wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb); 973 974 if (!wl12xx_is_dummy_packet(wl, skb)) { 975 info = IEEE80211_SKB_CB(skb); 976 info->status.rates[0].idx = -1; 977 info->status.rates[0].count = 0; 978 ieee80211_tx_status_ni(wl->hw, skb); 979 } 980 981 total[i]++; 982 } 983 } 984 985 spin_lock_irqsave(&wl->wl_lock, flags); 986 for (i = 0; i < NUM_TX_QUEUES; i++) 987 wl->tx_queue_count[i] -= total[i]; 988 spin_unlock_irqrestore(&wl->wl_lock, flags); 989 990 wl1271_handle_tx_low_watermark(wl); 991 } 992 993 /* caller must hold wl->mutex and TX must be stopped */ 994 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif) 995 { 996 int i; 997 998 /* TX failure */ 999 for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) { 1000 if (wlvif->bss_type == BSS_TYPE_AP_BSS) 1001 wl1271_free_sta(wl, wlvif, i); 1002 else 1003 wlvif->sta.ba_rx_bitmap = 0; 1004 1005 wl->links[i].allocated_pkts = 0; 1006 wl->links[i].prev_freed_pkts = 0; 1007 } 1008 wlvif->last_tx_hlid = 0; 1009 1010 } 1011 /* caller must hold wl->mutex and TX must be stopped */ 1012 void wl12xx_tx_reset(struct wl1271 *wl) 1013 { 1014 int i; 1015 struct sk_buff *skb; 1016 struct ieee80211_tx_info *info; 1017 1018 /* only reset the queues if something bad happened */ 1019 if (WARN_ON_ONCE(wl1271_tx_total_queue_count(wl) != 0)) { 1020 for (i = 0; i < WL12XX_MAX_LINKS; i++) 1021 wl1271_tx_reset_link_queues(wl, i); 1022 1023 for (i = 0; i < NUM_TX_QUEUES; i++) 1024 wl->tx_queue_count[i] = 0; 1025 } 1026 1027 /* 1028 * Make sure the driver is at a consistent state, in case this 1029 * function is called from a context other than interface removal. 1030 * This call will always wake the TX queues. 1031 */ 1032 wl1271_handle_tx_low_watermark(wl); 1033 1034 for (i = 0; i < wl->num_tx_desc; i++) { 1035 if (wl->tx_frames[i] == NULL) 1036 continue; 1037 1038 skb = wl->tx_frames[i]; 1039 wl1271_free_tx_id(wl, i); 1040 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb); 1041 1042 if (!wl12xx_is_dummy_packet(wl, skb)) { 1043 /* 1044 * Remove private headers before passing the skb to 1045 * mac80211 1046 */ 1047 info = IEEE80211_SKB_CB(skb); 1048 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr)); 1049 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) && 1050 info->control.hw_key && 1051 info->control.hw_key->cipher == 1052 WLAN_CIPHER_SUITE_TKIP) { 1053 int hdrlen = ieee80211_get_hdrlen_from_skb(skb); 1054 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, 1055 skb->data, hdrlen); 1056 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP); 1057 } 1058 1059 info->status.rates[0].idx = -1; 1060 info->status.rates[0].count = 0; 1061 1062 ieee80211_tx_status_ni(wl->hw, skb); 1063 } 1064 } 1065 } 1066 1067 #define WL1271_TX_FLUSH_TIMEOUT 500000 1068 1069 /* caller must *NOT* hold wl->mutex */ 1070 void wl1271_tx_flush(struct wl1271 *wl) 1071 { 1072 unsigned long timeout; 1073 int i; 1074 timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT); 1075 1076 /* only one flush should be in progress, for consistent queue state */ 1077 mutex_lock(&wl->flush_mutex); 1078 1079 wlcore_stop_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH); 1080 1081 while (!time_after(jiffies, timeout)) { 1082 mutex_lock(&wl->mutex); 1083 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d", 1084 wl->tx_frames_cnt, 1085 wl1271_tx_total_queue_count(wl)); 1086 if ((wl->tx_frames_cnt == 0) && 1087 (wl1271_tx_total_queue_count(wl) == 0)) { 1088 mutex_unlock(&wl->mutex); 1089 goto out; 1090 } 1091 mutex_unlock(&wl->mutex); 1092 msleep(1); 1093 } 1094 1095 wl1271_warning("Unable to flush all TX buffers, timed out."); 1096 1097 /* forcibly flush all Tx buffers on our queues */ 1098 mutex_lock(&wl->mutex); 1099 for (i = 0; i < WL12XX_MAX_LINKS; i++) 1100 wl1271_tx_reset_link_queues(wl, i); 1101 mutex_unlock(&wl->mutex); 1102 1103 out: 1104 wlcore_wake_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH); 1105 mutex_unlock(&wl->flush_mutex); 1106 } 1107 EXPORT_SYMBOL_GPL(wl1271_tx_flush); 1108 1109 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set) 1110 { 1111 if (WARN_ON(!rate_set)) 1112 return 0; 1113 1114 return BIT(__ffs(rate_set)); 1115 } 1116 1117 void wlcore_stop_queue_locked(struct wl1271 *wl, u8 queue, 1118 enum wlcore_queue_stop_reason reason) 1119 { 1120 bool stopped = !!wl->queue_stop_reasons[queue]; 1121 1122 /* queue should not be stopped for this reason */ 1123 WARN_ON(test_and_set_bit(reason, &wl->queue_stop_reasons[queue])); 1124 1125 if (stopped) 1126 return; 1127 1128 ieee80211_stop_queue(wl->hw, wl1271_tx_get_mac80211_queue(queue)); 1129 } 1130 1131 void wlcore_stop_queue(struct wl1271 *wl, u8 queue, 1132 enum wlcore_queue_stop_reason reason) 1133 { 1134 unsigned long flags; 1135 1136 spin_lock_irqsave(&wl->wl_lock, flags); 1137 wlcore_stop_queue_locked(wl, queue, reason); 1138 spin_unlock_irqrestore(&wl->wl_lock, flags); 1139 } 1140 1141 void wlcore_wake_queue(struct wl1271 *wl, u8 queue, 1142 enum wlcore_queue_stop_reason reason) 1143 { 1144 unsigned long flags; 1145 1146 spin_lock_irqsave(&wl->wl_lock, flags); 1147 1148 /* queue should not be clear for this reason */ 1149 WARN_ON(!test_and_clear_bit(reason, &wl->queue_stop_reasons[queue])); 1150 1151 if (wl->queue_stop_reasons[queue]) 1152 goto out; 1153 1154 ieee80211_wake_queue(wl->hw, wl1271_tx_get_mac80211_queue(queue)); 1155 1156 out: 1157 spin_unlock_irqrestore(&wl->wl_lock, flags); 1158 } 1159 1160 void wlcore_stop_queues(struct wl1271 *wl, 1161 enum wlcore_queue_stop_reason reason) 1162 { 1163 int i; 1164 1165 for (i = 0; i < NUM_TX_QUEUES; i++) 1166 wlcore_stop_queue(wl, i, reason); 1167 } 1168 EXPORT_SYMBOL_GPL(wlcore_stop_queues); 1169 1170 void wlcore_wake_queues(struct wl1271 *wl, 1171 enum wlcore_queue_stop_reason reason) 1172 { 1173 int i; 1174 1175 for (i = 0; i < NUM_TX_QUEUES; i++) 1176 wlcore_wake_queue(wl, i, reason); 1177 } 1178 EXPORT_SYMBOL_GPL(wlcore_wake_queues); 1179 1180 void wlcore_reset_stopped_queues(struct wl1271 *wl) 1181 { 1182 int i; 1183 unsigned long flags; 1184 1185 spin_lock_irqsave(&wl->wl_lock, flags); 1186 1187 for (i = 0; i < NUM_TX_QUEUES; i++) { 1188 if (!wl->queue_stop_reasons[i]) 1189 continue; 1190 1191 wl->queue_stop_reasons[i] = 0; 1192 ieee80211_wake_queue(wl->hw, 1193 wl1271_tx_get_mac80211_queue(i)); 1194 } 1195 1196 spin_unlock_irqrestore(&wl->wl_lock, flags); 1197 } 1198 1199 bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl, u8 queue, 1200 enum wlcore_queue_stop_reason reason) 1201 { 1202 return test_bit(reason, &wl->queue_stop_reasons[queue]); 1203 } 1204 1205 bool wlcore_is_queue_stopped(struct wl1271 *wl, u8 queue) 1206 { 1207 return !!wl->queue_stop_reasons[queue]; 1208 } 1209