1 /****************************************************************************** 2 * 3 * This file is provided under a dual BSD/GPLv2 license. When using or 4 * redistributing this file, you may do so under either license. 5 * 6 * GPL LICENSE SUMMARY 7 * 8 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. 9 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 10 * Copyright(c) 2016 Intel Deutschland GmbH 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of version 2 of the GNU General Public License as 14 * published by the Free Software Foundation. 15 * 16 * This program is distributed in the hope that it will be useful, but 17 * WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, 24 * USA 25 * 26 * The full GNU General Public License is included in this distribution 27 * in the file called COPYING. 28 * 29 * Contact Information: 30 * Intel Linux Wireless <linuxwifi@intel.com> 31 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 32 * 33 * BSD LICENSE 34 * 35 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. 36 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 37 * All rights reserved. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 43 * * Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * * Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in 47 * the documentation and/or other materials provided with the 48 * distribution. 49 * * Neither the name Intel Corporation nor the names of its 50 * contributors may be used to endorse or promote products derived 51 * from this software without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 54 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 55 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 56 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 57 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 58 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 59 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 60 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 61 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 62 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 63 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 64 * 65 *****************************************************************************/ 66 #include <linux/ieee80211.h> 67 #include <linux/etherdevice.h> 68 #include <linux/tcp.h> 69 #include <net/ip.h> 70 71 #include "iwl-trans.h" 72 #include "iwl-eeprom-parse.h" 73 #include "mvm.h" 74 #include "sta.h" 75 #include "fw-dbg.h" 76 77 static void 78 iwl_mvm_bar_check_trigger(struct iwl_mvm *mvm, const u8 *addr, 79 u16 tid, u16 ssn) 80 { 81 struct iwl_fw_dbg_trigger_tlv *trig; 82 struct iwl_fw_dbg_trigger_ba *ba_trig; 83 84 if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_BA)) 85 return; 86 87 trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_BA); 88 ba_trig = (void *)trig->data; 89 90 if (!iwl_fw_dbg_trigger_check_stop(mvm, NULL, trig)) 91 return; 92 93 if (!(le16_to_cpu(ba_trig->tx_bar) & BIT(tid))) 94 return; 95 96 iwl_mvm_fw_dbg_collect_trig(mvm, trig, 97 "BAR sent to %pM, tid %d, ssn %d", 98 addr, tid, ssn); 99 } 100 101 /* 102 * Sets most of the Tx cmd's fields 103 */ 104 void iwl_mvm_set_tx_cmd(struct iwl_mvm *mvm, struct sk_buff *skb, 105 struct iwl_tx_cmd *tx_cmd, 106 struct ieee80211_tx_info *info, u8 sta_id) 107 { 108 struct ieee80211_hdr *hdr = (void *)skb->data; 109 __le16 fc = hdr->frame_control; 110 u32 tx_flags = le32_to_cpu(tx_cmd->tx_flags); 111 u32 len = skb->len + FCS_LEN; 112 u8 ac; 113 114 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) 115 tx_flags |= TX_CMD_FLG_ACK; 116 else 117 tx_flags &= ~TX_CMD_FLG_ACK; 118 119 if (ieee80211_is_probe_resp(fc)) 120 tx_flags |= TX_CMD_FLG_TSF; 121 122 if (ieee80211_has_morefrags(fc)) 123 tx_flags |= TX_CMD_FLG_MORE_FRAG; 124 125 if (ieee80211_is_data_qos(fc)) { 126 u8 *qc = ieee80211_get_qos_ctl(hdr); 127 tx_cmd->tid_tspec = qc[0] & 0xf; 128 tx_flags &= ~TX_CMD_FLG_SEQ_CTL; 129 } else if (ieee80211_is_back_req(fc)) { 130 struct ieee80211_bar *bar = (void *)skb->data; 131 u16 control = le16_to_cpu(bar->control); 132 u16 ssn = le16_to_cpu(bar->start_seq_num); 133 134 tx_flags |= TX_CMD_FLG_ACK | TX_CMD_FLG_BAR; 135 tx_cmd->tid_tspec = (control & 136 IEEE80211_BAR_CTRL_TID_INFO_MASK) >> 137 IEEE80211_BAR_CTRL_TID_INFO_SHIFT; 138 WARN_ON_ONCE(tx_cmd->tid_tspec >= IWL_MAX_TID_COUNT); 139 iwl_mvm_bar_check_trigger(mvm, bar->ra, tx_cmd->tid_tspec, 140 ssn); 141 } else { 142 tx_cmd->tid_tspec = IWL_TID_NON_QOS; 143 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) 144 tx_flags |= TX_CMD_FLG_SEQ_CTL; 145 else 146 tx_flags &= ~TX_CMD_FLG_SEQ_CTL; 147 } 148 149 /* Default to 0 (BE) when tid_spec is set to IWL_TID_NON_QOS */ 150 if (tx_cmd->tid_tspec < IWL_MAX_TID_COUNT) 151 ac = tid_to_mac80211_ac[tx_cmd->tid_tspec]; 152 else 153 ac = tid_to_mac80211_ac[0]; 154 155 tx_flags |= iwl_mvm_bt_coex_tx_prio(mvm, hdr, info, ac) << 156 TX_CMD_FLG_BT_PRIO_POS; 157 158 if (ieee80211_is_mgmt(fc)) { 159 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc)) 160 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_ASSOC); 161 else if (ieee80211_is_action(fc)) 162 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_NONE); 163 else 164 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_MGMT); 165 166 /* The spec allows Action frames in A-MPDU, we don't support 167 * it 168 */ 169 WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU); 170 } else if (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO) { 171 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_MGMT); 172 } else { 173 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_NONE); 174 } 175 176 if (ieee80211_is_data(fc) && len > mvm->rts_threshold && 177 !is_multicast_ether_addr(ieee80211_get_DA(hdr))) 178 tx_flags |= TX_CMD_FLG_PROT_REQUIRE; 179 180 if (fw_has_capa(&mvm->fw->ucode_capa, 181 IWL_UCODE_TLV_CAPA_TXPOWER_INSERTION_SUPPORT) && 182 ieee80211_action_contains_tpc(skb)) 183 tx_flags |= TX_CMD_FLG_WRITE_TX_POWER; 184 185 tx_cmd->tx_flags = cpu_to_le32(tx_flags); 186 /* Total # bytes to be transmitted */ 187 tx_cmd->len = cpu_to_le16((u16)skb->len + 188 (uintptr_t)info->driver_data[0]); 189 tx_cmd->next_frame_len = 0; 190 tx_cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE); 191 tx_cmd->sta_id = sta_id; 192 } 193 194 /* 195 * Sets the fields in the Tx cmd that are rate related 196 */ 197 void iwl_mvm_set_tx_cmd_rate(struct iwl_mvm *mvm, struct iwl_tx_cmd *tx_cmd, 198 struct ieee80211_tx_info *info, 199 struct ieee80211_sta *sta, __le16 fc) 200 { 201 u32 rate_flags; 202 int rate_idx; 203 u8 rate_plcp; 204 205 /* Set retry limit on RTS packets */ 206 tx_cmd->rts_retry_limit = IWL_RTS_DFAULT_RETRY_LIMIT; 207 208 /* Set retry limit on DATA packets and Probe Responses*/ 209 if (ieee80211_is_probe_resp(fc)) { 210 tx_cmd->data_retry_limit = IWL_MGMT_DFAULT_RETRY_LIMIT; 211 tx_cmd->rts_retry_limit = 212 min(tx_cmd->data_retry_limit, tx_cmd->rts_retry_limit); 213 } else if (ieee80211_is_back_req(fc)) { 214 tx_cmd->data_retry_limit = IWL_BAR_DFAULT_RETRY_LIMIT; 215 } else { 216 tx_cmd->data_retry_limit = IWL_DEFAULT_TX_RETRY; 217 } 218 219 /* 220 * for data packets, rate info comes from the table inside the fw. This 221 * table is controlled by LINK_QUALITY commands 222 */ 223 224 if (ieee80211_is_data(fc) && sta) { 225 tx_cmd->initial_rate_index = 0; 226 tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_STA_RATE); 227 return; 228 } else if (ieee80211_is_back_req(fc)) { 229 tx_cmd->tx_flags |= 230 cpu_to_le32(TX_CMD_FLG_ACK | TX_CMD_FLG_BAR); 231 } 232 233 /* HT rate doesn't make sense for a non data frame */ 234 WARN_ONCE(info->control.rates[0].flags & IEEE80211_TX_RC_MCS, 235 "Got an HT rate (flags:0x%x/mcs:%d) for a non data frame (fc:0x%x)\n", 236 info->control.rates[0].flags, 237 info->control.rates[0].idx, 238 le16_to_cpu(fc)); 239 240 rate_idx = info->control.rates[0].idx; 241 /* if the rate isn't a well known legacy rate, take the lowest one */ 242 if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT_LEGACY) 243 rate_idx = rate_lowest_index( 244 &mvm->nvm_data->bands[info->band], sta); 245 246 /* For 5 GHZ band, remap mac80211 rate indices into driver indices */ 247 if (info->band == IEEE80211_BAND_5GHZ) 248 rate_idx += IWL_FIRST_OFDM_RATE; 249 250 /* For 2.4 GHZ band, check that there is no need to remap */ 251 BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0); 252 253 /* Get PLCP rate for tx_cmd->rate_n_flags */ 254 rate_plcp = iwl_mvm_mac80211_idx_to_hwrate(rate_idx); 255 256 mvm->mgmt_last_antenna_idx = 257 iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm), 258 mvm->mgmt_last_antenna_idx); 259 260 if (info->band == IEEE80211_BAND_2GHZ && 261 !iwl_mvm_bt_coex_is_shared_ant_avail(mvm)) 262 rate_flags = mvm->cfg->non_shared_ant << RATE_MCS_ANT_POS; 263 else 264 rate_flags = 265 BIT(mvm->mgmt_last_antenna_idx) << RATE_MCS_ANT_POS; 266 267 /* Set CCK flag as needed */ 268 if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE)) 269 rate_flags |= RATE_MCS_CCK_MSK; 270 271 /* Set the rate in the TX cmd */ 272 tx_cmd->rate_n_flags = cpu_to_le32((u32)rate_plcp | rate_flags); 273 } 274 275 /* 276 * Sets the fields in the Tx cmd that are crypto related 277 */ 278 static void iwl_mvm_set_tx_cmd_crypto(struct iwl_mvm *mvm, 279 struct ieee80211_tx_info *info, 280 struct iwl_tx_cmd *tx_cmd, 281 struct sk_buff *skb_frag, 282 int hdrlen) 283 { 284 struct ieee80211_key_conf *keyconf = info->control.hw_key; 285 u8 *crypto_hdr = skb_frag->data + hdrlen; 286 u64 pn; 287 288 switch (keyconf->cipher) { 289 case WLAN_CIPHER_SUITE_CCMP: 290 case WLAN_CIPHER_SUITE_CCMP_256: 291 iwl_mvm_set_tx_cmd_ccmp(info, tx_cmd); 292 pn = atomic64_inc_return(&keyconf->tx_pn); 293 crypto_hdr[0] = pn; 294 crypto_hdr[2] = 0; 295 crypto_hdr[3] = 0x20 | (keyconf->keyidx << 6); 296 crypto_hdr[1] = pn >> 8; 297 crypto_hdr[4] = pn >> 16; 298 crypto_hdr[5] = pn >> 24; 299 crypto_hdr[6] = pn >> 32; 300 crypto_hdr[7] = pn >> 40; 301 break; 302 303 case WLAN_CIPHER_SUITE_TKIP: 304 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP; 305 pn = atomic64_inc_return(&keyconf->tx_pn); 306 ieee80211_tkip_add_iv(crypto_hdr, keyconf, pn); 307 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key); 308 break; 309 310 case WLAN_CIPHER_SUITE_WEP104: 311 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128; 312 /* fall through */ 313 case WLAN_CIPHER_SUITE_WEP40: 314 tx_cmd->sec_ctl |= TX_CMD_SEC_WEP | 315 ((keyconf->keyidx << TX_CMD_SEC_WEP_KEY_IDX_POS) & 316 TX_CMD_SEC_WEP_KEY_IDX_MSK); 317 318 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen); 319 break; 320 default: 321 tx_cmd->sec_ctl |= TX_CMD_SEC_EXT; 322 } 323 } 324 325 /* 326 * Allocates and sets the Tx cmd the driver data pointers in the skb 327 */ 328 static struct iwl_device_cmd * 329 iwl_mvm_set_tx_params(struct iwl_mvm *mvm, struct sk_buff *skb, 330 int hdrlen, struct ieee80211_sta *sta, u8 sta_id) 331 { 332 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 333 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 334 struct iwl_device_cmd *dev_cmd; 335 struct iwl_tx_cmd *tx_cmd; 336 337 dev_cmd = iwl_trans_alloc_tx_cmd(mvm->trans); 338 339 if (unlikely(!dev_cmd)) 340 return NULL; 341 342 memset(dev_cmd, 0, sizeof(*dev_cmd)); 343 dev_cmd->hdr.cmd = TX_CMD; 344 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload; 345 346 if (info->control.hw_key) 347 iwl_mvm_set_tx_cmd_crypto(mvm, info, tx_cmd, skb, hdrlen); 348 349 iwl_mvm_set_tx_cmd(mvm, skb, tx_cmd, info, sta_id); 350 351 iwl_mvm_set_tx_cmd_rate(mvm, tx_cmd, info, sta, hdr->frame_control); 352 353 memset(&info->status, 0, sizeof(info->status)); 354 memset(info->driver_data, 0, sizeof(info->driver_data)); 355 356 info->driver_data[1] = dev_cmd; 357 358 return dev_cmd; 359 } 360 361 int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb) 362 { 363 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 364 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 365 struct iwl_device_cmd *dev_cmd; 366 struct iwl_tx_cmd *tx_cmd; 367 u8 sta_id; 368 int hdrlen = ieee80211_hdrlen(hdr->frame_control); 369 370 if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU)) 371 return -1; 372 373 if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM && 374 (!info->control.vif || 375 info->hw_queue != info->control.vif->cab_queue))) 376 return -1; 377 378 /* This holds the amsdu headers length */ 379 info->driver_data[0] = (void *)(uintptr_t)0; 380 381 /* 382 * IWL_MVM_OFFCHANNEL_QUEUE is used for ROC packets that can be used 383 * in 2 different types of vifs, P2P & STATION. P2P uses the offchannel 384 * queue. STATION (HS2.0) uses the auxiliary context of the FW, 385 * and hence needs to be sent on the aux queue 386 */ 387 if (IEEE80211_SKB_CB(skb)->hw_queue == IWL_MVM_OFFCHANNEL_QUEUE && 388 info->control.vif->type == NL80211_IFTYPE_STATION) 389 IEEE80211_SKB_CB(skb)->hw_queue = mvm->aux_queue; 390 391 /* 392 * If the interface on which the frame is sent is the P2P_DEVICE 393 * or an AP/GO interface use the broadcast station associated 394 * with it; otherwise if the interface is a managed interface 395 * use the AP station associated with it for multicast traffic 396 * (this is not possible for unicast packets as a TLDS discovery 397 * response are sent without a station entry); otherwise use the 398 * AUX station. 399 */ 400 sta_id = mvm->aux_sta.sta_id; 401 if (info->control.vif) { 402 struct iwl_mvm_vif *mvmvif = 403 iwl_mvm_vif_from_mac80211(info->control.vif); 404 405 if (info->control.vif->type == NL80211_IFTYPE_P2P_DEVICE || 406 info->control.vif->type == NL80211_IFTYPE_AP) 407 sta_id = mvmvif->bcast_sta.sta_id; 408 else if (info->control.vif->type == NL80211_IFTYPE_STATION && 409 is_multicast_ether_addr(hdr->addr1)) { 410 u8 ap_sta_id = ACCESS_ONCE(mvmvif->ap_sta_id); 411 412 if (ap_sta_id != IWL_MVM_STATION_COUNT) 413 sta_id = ap_sta_id; 414 } 415 } 416 417 IWL_DEBUG_TX(mvm, "station Id %d, queue=%d\n", sta_id, info->hw_queue); 418 419 dev_cmd = iwl_mvm_set_tx_params(mvm, skb, hdrlen, NULL, sta_id); 420 if (!dev_cmd) 421 return -1; 422 423 /* From now on, we cannot access info->control */ 424 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload; 425 426 /* Copy MAC header from skb into command buffer */ 427 memcpy(tx_cmd->hdr, hdr, hdrlen); 428 429 if (iwl_trans_tx(mvm->trans, skb, dev_cmd, info->hw_queue)) { 430 iwl_trans_free_tx_cmd(mvm->trans, dev_cmd); 431 return -1; 432 } 433 434 /* 435 * Increase the pending frames counter, so that later when a reply comes 436 * in and the counter is decreased - we don't start getting negative 437 * values. 438 * Note that we don't need to make sure it isn't agg'd, since we're 439 * TXing non-sta 440 */ 441 atomic_inc(&mvm->pending_frames[sta_id]); 442 443 return 0; 444 } 445 446 #ifdef CONFIG_INET 447 static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb, 448 struct ieee80211_sta *sta, 449 struct sk_buff_head *mpdus_skb) 450 { 451 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 452 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 453 struct ieee80211_hdr *hdr = (void *)skb->data; 454 unsigned int mss = skb_shinfo(skb)->gso_size; 455 struct sk_buff *tmp, *next; 456 char cb[sizeof(skb->cb)]; 457 unsigned int num_subframes, tcp_payload_len, subf_len, max_amsdu_len; 458 bool ipv4 = (skb->protocol == htons(ETH_P_IP)); 459 u16 ip_base_id = ipv4 ? ntohs(ip_hdr(skb)->id) : 0; 460 u16 amsdu_add, snap_ip_tcp, pad, i = 0; 461 unsigned int dbg_max_amsdu_len; 462 u8 *qc, tid, txf; 463 464 snap_ip_tcp = 8 + skb_transport_header(skb) - skb_network_header(skb) + 465 tcp_hdrlen(skb); 466 467 qc = ieee80211_get_qos_ctl(hdr); 468 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 469 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT)) 470 return -EINVAL; 471 472 if (!sta->max_amsdu_len || 473 !ieee80211_is_data_qos(hdr->frame_control) || 474 !mvmsta->tlc_amsdu) { 475 num_subframes = 1; 476 pad = 0; 477 goto segment; 478 } 479 480 /* 481 * No need to lock amsdu_in_ampdu_allowed since it can't be modified 482 * during an BA session. 483 */ 484 if (info->flags & IEEE80211_TX_CTL_AMPDU && 485 !mvmsta->tid_data[tid].amsdu_in_ampdu_allowed) { 486 num_subframes = 1; 487 pad = 0; 488 goto segment; 489 } 490 491 max_amsdu_len = sta->max_amsdu_len; 492 dbg_max_amsdu_len = ACCESS_ONCE(mvm->max_amsdu_len); 493 494 /* the Tx FIFO to which this A-MSDU will be routed */ 495 txf = iwl_mvm_ac_to_tx_fifo[tid_to_mac80211_ac[tid]]; 496 497 /* 498 * Don't send an AMSDU that will be longer than the TXF. 499 * Add a security margin of 256 for the TX command + headers. 500 * We also want to have the start of the next packet inside the 501 * fifo to be able to send bursts. 502 */ 503 max_amsdu_len = min_t(unsigned int, max_amsdu_len, 504 mvm->shared_mem_cfg.txfifo_size[txf] - 256); 505 506 if (dbg_max_amsdu_len) 507 max_amsdu_len = min_t(unsigned int, max_amsdu_len, 508 dbg_max_amsdu_len); 509 510 /* 511 * Limit A-MSDU in A-MPDU to 4095 bytes when VHT is not 512 * supported. This is a spec requirement (IEEE 802.11-2015 513 * section 8.7.3 NOTE 3). 514 */ 515 if (info->flags & IEEE80211_TX_CTL_AMPDU && 516 !sta->vht_cap.vht_supported) 517 max_amsdu_len = min_t(unsigned int, max_amsdu_len, 4095); 518 519 /* Sub frame header + SNAP + IP header + TCP header + MSS */ 520 subf_len = sizeof(struct ethhdr) + snap_ip_tcp + mss; 521 pad = (4 - subf_len) & 0x3; 522 523 /* 524 * If we have N subframes in the A-MSDU, then the A-MSDU's size is 525 * N * subf_len + (N - 1) * pad. 526 */ 527 num_subframes = (max_amsdu_len + pad) / (subf_len + pad); 528 if (num_subframes > 1) 529 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 530 531 tcp_payload_len = skb_tail_pointer(skb) - skb_transport_header(skb) - 532 tcp_hdrlen(skb) + skb->data_len; 533 534 /* 535 * Make sure we have enough TBs for the A-MSDU: 536 * 2 for each subframe 537 * 1 more for each fragment 538 * 1 more for the potential data in the header 539 */ 540 num_subframes = 541 min_t(unsigned int, num_subframes, 542 (mvm->trans->max_skb_frags - 1 - 543 skb_shinfo(skb)->nr_frags) / 2); 544 545 /* This skb fits in one single A-MSDU */ 546 if (num_subframes * mss >= tcp_payload_len) { 547 /* 548 * Compute the length of all the data added for the A-MSDU. 549 * This will be used to compute the length to write in the TX 550 * command. We have: SNAP + IP + TCP for n -1 subframes and 551 * ETH header for n subframes. Note that the original skb 552 * already had one set of SNAP / IP / TCP headers. 553 */ 554 num_subframes = DIV_ROUND_UP(tcp_payload_len, mss); 555 info = IEEE80211_SKB_CB(skb); 556 amsdu_add = num_subframes * sizeof(struct ethhdr) + 557 (num_subframes - 1) * (snap_ip_tcp + pad); 558 /* This holds the amsdu headers length */ 559 info->driver_data[0] = (void *)(uintptr_t)amsdu_add; 560 561 __skb_queue_tail(mpdus_skb, skb); 562 return 0; 563 } 564 565 /* 566 * Trick the segmentation function to make it 567 * create SKBs that can fit into one A-MSDU. 568 */ 569 segment: 570 skb_shinfo(skb)->gso_size = num_subframes * mss; 571 memcpy(cb, skb->cb, sizeof(cb)); 572 573 next = skb_gso_segment(skb, NETIF_F_CSUM_MASK | NETIF_F_SG); 574 skb_shinfo(skb)->gso_size = mss; 575 if (WARN_ON_ONCE(IS_ERR(next))) 576 return -EINVAL; 577 else if (next) 578 consume_skb(skb); 579 580 while (next) { 581 tmp = next; 582 next = tmp->next; 583 584 memcpy(tmp->cb, cb, sizeof(tmp->cb)); 585 /* 586 * Compute the length of all the data added for the A-MSDU. 587 * This will be used to compute the length to write in the TX 588 * command. We have: SNAP + IP + TCP for n -1 subframes and 589 * ETH header for n subframes. 590 */ 591 tcp_payload_len = skb_tail_pointer(tmp) - 592 skb_transport_header(tmp) - 593 tcp_hdrlen(tmp) + tmp->data_len; 594 595 if (ipv4) 596 ip_hdr(tmp)->id = htons(ip_base_id + i * num_subframes); 597 598 if (tcp_payload_len > mss) { 599 num_subframes = DIV_ROUND_UP(tcp_payload_len, mss); 600 info = IEEE80211_SKB_CB(tmp); 601 amsdu_add = num_subframes * sizeof(struct ethhdr) + 602 (num_subframes - 1) * (snap_ip_tcp + pad); 603 info->driver_data[0] = (void *)(uintptr_t)amsdu_add; 604 skb_shinfo(tmp)->gso_size = mss; 605 } else { 606 qc = ieee80211_get_qos_ctl((void *)tmp->data); 607 608 if (ipv4) 609 ip_send_check(ip_hdr(tmp)); 610 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT; 611 skb_shinfo(tmp)->gso_size = 0; 612 } 613 614 tmp->prev = NULL; 615 tmp->next = NULL; 616 617 __skb_queue_tail(mpdus_skb, tmp); 618 i++; 619 } 620 621 return 0; 622 } 623 #else /* CONFIG_INET */ 624 static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb, 625 struct ieee80211_sta *sta, 626 struct sk_buff_head *mpdus_skb) 627 { 628 /* Impossible to get TSO with CONFIG_INET */ 629 WARN_ON(1); 630 631 return -1; 632 } 633 #endif 634 635 /* 636 * Sets the fields in the Tx cmd that are crypto related 637 */ 638 static int iwl_mvm_tx_mpdu(struct iwl_mvm *mvm, struct sk_buff *skb, 639 struct ieee80211_sta *sta) 640 { 641 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 642 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 643 struct iwl_mvm_sta *mvmsta; 644 struct iwl_device_cmd *dev_cmd; 645 struct iwl_tx_cmd *tx_cmd; 646 __le16 fc; 647 u16 seq_number = 0; 648 u8 tid = IWL_MAX_TID_COUNT; 649 u8 txq_id = info->hw_queue; 650 bool is_data_qos = false, is_ampdu = false; 651 int hdrlen; 652 653 mvmsta = iwl_mvm_sta_from_mac80211(sta); 654 fc = hdr->frame_control; 655 hdrlen = ieee80211_hdrlen(fc); 656 657 if (WARN_ON_ONCE(!mvmsta)) 658 return -1; 659 660 if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT)) 661 return -1; 662 663 dev_cmd = iwl_mvm_set_tx_params(mvm, skb, hdrlen, sta, mvmsta->sta_id); 664 if (!dev_cmd) 665 goto drop; 666 667 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload; 668 /* From now on, we cannot access info->control */ 669 670 /* 671 * we handle that entirely ourselves -- for uAPSD the firmware 672 * will always send a notification, and for PS-Poll responses 673 * we'll notify mac80211 when getting frame status 674 */ 675 info->flags &= ~IEEE80211_TX_STATUS_EOSP; 676 677 spin_lock(&mvmsta->lock); 678 679 if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) { 680 u8 *qc = NULL; 681 qc = ieee80211_get_qos_ctl(hdr); 682 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK; 683 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT)) 684 goto drop_unlock_sta; 685 686 seq_number = mvmsta->tid_data[tid].seq_number; 687 seq_number &= IEEE80211_SCTL_SEQ; 688 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); 689 hdr->seq_ctrl |= cpu_to_le16(seq_number); 690 is_data_qos = true; 691 is_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU; 692 } 693 694 /* Copy MAC header from skb into command buffer */ 695 memcpy(tx_cmd->hdr, hdr, hdrlen); 696 697 WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM); 698 699 if (sta->tdls) { 700 /* default to TID 0 for non-QoS packets */ 701 u8 tdls_tid = tid == IWL_MAX_TID_COUNT ? 0 : tid; 702 703 txq_id = mvmsta->hw_queue[tid_to_mac80211_ac[tdls_tid]]; 704 } 705 706 if (is_ampdu) { 707 if (WARN_ON_ONCE(mvmsta->tid_data[tid].state != IWL_AGG_ON)) 708 goto drop_unlock_sta; 709 txq_id = mvmsta->tid_data[tid].txq_id; 710 } 711 712 IWL_DEBUG_TX(mvm, "TX to [%d|%d] Q:%d - seq: 0x%x\n", mvmsta->sta_id, 713 tid, txq_id, IEEE80211_SEQ_TO_SN(seq_number)); 714 715 if (iwl_trans_tx(mvm->trans, skb, dev_cmd, txq_id)) 716 goto drop_unlock_sta; 717 718 if (is_data_qos && !ieee80211_has_morefrags(fc)) 719 mvmsta->tid_data[tid].seq_number = seq_number + 0x10; 720 721 spin_unlock(&mvmsta->lock); 722 723 if (txq_id < mvm->first_agg_queue) 724 atomic_inc(&mvm->pending_frames[mvmsta->sta_id]); 725 726 return 0; 727 728 drop_unlock_sta: 729 iwl_trans_free_tx_cmd(mvm->trans, dev_cmd); 730 spin_unlock(&mvmsta->lock); 731 drop: 732 return -1; 733 } 734 735 int iwl_mvm_tx_skb(struct iwl_mvm *mvm, struct sk_buff *skb, 736 struct ieee80211_sta *sta) 737 { 738 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 739 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 740 struct sk_buff_head mpdus_skbs; 741 unsigned int payload_len; 742 int ret; 743 744 if (WARN_ON_ONCE(!mvmsta)) 745 return -1; 746 747 if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT)) 748 return -1; 749 750 /* This holds the amsdu headers length */ 751 info->driver_data[0] = (void *)(uintptr_t)0; 752 753 if (!skb_is_gso(skb)) 754 return iwl_mvm_tx_mpdu(mvm, skb, sta); 755 756 payload_len = skb_tail_pointer(skb) - skb_transport_header(skb) - 757 tcp_hdrlen(skb) + skb->data_len; 758 759 if (payload_len <= skb_shinfo(skb)->gso_size) 760 return iwl_mvm_tx_mpdu(mvm, skb, sta); 761 762 __skb_queue_head_init(&mpdus_skbs); 763 764 ret = iwl_mvm_tx_tso(mvm, skb, sta, &mpdus_skbs); 765 if (ret) 766 return ret; 767 768 if (WARN_ON(skb_queue_empty(&mpdus_skbs))) 769 return ret; 770 771 while (!skb_queue_empty(&mpdus_skbs)) { 772 skb = __skb_dequeue(&mpdus_skbs); 773 774 ret = iwl_mvm_tx_mpdu(mvm, skb, sta); 775 if (ret) { 776 __skb_queue_purge(&mpdus_skbs); 777 return ret; 778 } 779 } 780 781 return 0; 782 } 783 784 static void iwl_mvm_check_ratid_empty(struct iwl_mvm *mvm, 785 struct ieee80211_sta *sta, u8 tid) 786 { 787 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 788 struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid]; 789 struct ieee80211_vif *vif = mvmsta->vif; 790 791 lockdep_assert_held(&mvmsta->lock); 792 793 if ((tid_data->state == IWL_AGG_ON || 794 tid_data->state == IWL_EMPTYING_HW_QUEUE_DELBA) && 795 iwl_mvm_tid_queued(tid_data) == 0) { 796 /* 797 * Now that this aggregation queue is empty tell mac80211 so it 798 * knows we no longer have frames buffered for the station on 799 * this TID (for the TIM bitmap calculation.) 800 */ 801 ieee80211_sta_set_buffered(sta, tid, false); 802 } 803 804 if (tid_data->ssn != tid_data->next_reclaimed) 805 return; 806 807 switch (tid_data->state) { 808 case IWL_EMPTYING_HW_QUEUE_ADDBA: 809 IWL_DEBUG_TX_QUEUES(mvm, 810 "Can continue addBA flow ssn = next_recl = %d\n", 811 tid_data->next_reclaimed); 812 tid_data->state = IWL_AGG_STARTING; 813 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid); 814 break; 815 816 case IWL_EMPTYING_HW_QUEUE_DELBA: 817 IWL_DEBUG_TX_QUEUES(mvm, 818 "Can continue DELBA flow ssn = next_recl = %d\n", 819 tid_data->next_reclaimed); 820 iwl_mvm_disable_txq(mvm, tid_data->txq_id, 821 vif->hw_queue[tid_to_mac80211_ac[tid]], tid, 822 CMD_ASYNC); 823 tid_data->state = IWL_AGG_OFF; 824 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid); 825 break; 826 827 default: 828 break; 829 } 830 } 831 832 #ifdef CONFIG_IWLWIFI_DEBUG 833 const char *iwl_mvm_get_tx_fail_reason(u32 status) 834 { 835 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x 836 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x 837 838 switch (status & TX_STATUS_MSK) { 839 case TX_STATUS_SUCCESS: 840 return "SUCCESS"; 841 TX_STATUS_POSTPONE(DELAY); 842 TX_STATUS_POSTPONE(FEW_BYTES); 843 TX_STATUS_POSTPONE(BT_PRIO); 844 TX_STATUS_POSTPONE(QUIET_PERIOD); 845 TX_STATUS_POSTPONE(CALC_TTAK); 846 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY); 847 TX_STATUS_FAIL(SHORT_LIMIT); 848 TX_STATUS_FAIL(LONG_LIMIT); 849 TX_STATUS_FAIL(UNDERRUN); 850 TX_STATUS_FAIL(DRAIN_FLOW); 851 TX_STATUS_FAIL(RFKILL_FLUSH); 852 TX_STATUS_FAIL(LIFE_EXPIRE); 853 TX_STATUS_FAIL(DEST_PS); 854 TX_STATUS_FAIL(HOST_ABORTED); 855 TX_STATUS_FAIL(BT_RETRY); 856 TX_STATUS_FAIL(STA_INVALID); 857 TX_STATUS_FAIL(FRAG_DROPPED); 858 TX_STATUS_FAIL(TID_DISABLE); 859 TX_STATUS_FAIL(FIFO_FLUSHED); 860 TX_STATUS_FAIL(SMALL_CF_POLL); 861 TX_STATUS_FAIL(FW_DROP); 862 TX_STATUS_FAIL(STA_COLOR_MISMATCH); 863 } 864 865 return "UNKNOWN"; 866 867 #undef TX_STATUS_FAIL 868 #undef TX_STATUS_POSTPONE 869 } 870 #endif /* CONFIG_IWLWIFI_DEBUG */ 871 872 void iwl_mvm_hwrate_to_tx_rate(u32 rate_n_flags, 873 enum ieee80211_band band, 874 struct ieee80211_tx_rate *r) 875 { 876 if (rate_n_flags & RATE_HT_MCS_GF_MSK) 877 r->flags |= IEEE80211_TX_RC_GREEN_FIELD; 878 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) { 879 case RATE_MCS_CHAN_WIDTH_20: 880 break; 881 case RATE_MCS_CHAN_WIDTH_40: 882 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 883 break; 884 case RATE_MCS_CHAN_WIDTH_80: 885 r->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH; 886 break; 887 case RATE_MCS_CHAN_WIDTH_160: 888 r->flags |= IEEE80211_TX_RC_160_MHZ_WIDTH; 889 break; 890 } 891 if (rate_n_flags & RATE_MCS_SGI_MSK) 892 r->flags |= IEEE80211_TX_RC_SHORT_GI; 893 if (rate_n_flags & RATE_MCS_HT_MSK) { 894 r->flags |= IEEE80211_TX_RC_MCS; 895 r->idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK; 896 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 897 ieee80211_rate_set_vht( 898 r, rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK, 899 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >> 900 RATE_VHT_MCS_NSS_POS) + 1); 901 r->flags |= IEEE80211_TX_RC_VHT_MCS; 902 } else { 903 r->idx = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags, 904 band); 905 } 906 } 907 908 /** 909 * translate ucode response to mac80211 tx status control values 910 */ 911 static void iwl_mvm_hwrate_to_tx_status(u32 rate_n_flags, 912 struct ieee80211_tx_info *info) 913 { 914 struct ieee80211_tx_rate *r = &info->status.rates[0]; 915 916 info->status.antenna = 917 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS); 918 iwl_mvm_hwrate_to_tx_rate(rate_n_flags, info->band, r); 919 } 920 921 static void iwl_mvm_tx_status_check_trigger(struct iwl_mvm *mvm, 922 u32 status) 923 { 924 struct iwl_fw_dbg_trigger_tlv *trig; 925 struct iwl_fw_dbg_trigger_tx_status *status_trig; 926 int i; 927 928 if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_TX_STATUS)) 929 return; 930 931 trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_TX_STATUS); 932 status_trig = (void *)trig->data; 933 934 if (!iwl_fw_dbg_trigger_check_stop(mvm, NULL, trig)) 935 return; 936 937 for (i = 0; i < ARRAY_SIZE(status_trig->statuses); i++) { 938 /* don't collect on status 0 */ 939 if (!status_trig->statuses[i].status) 940 break; 941 942 if (status_trig->statuses[i].status != (status & TX_STATUS_MSK)) 943 continue; 944 945 iwl_mvm_fw_dbg_collect_trig(mvm, trig, 946 "Tx status %d was received", 947 status & TX_STATUS_MSK); 948 break; 949 } 950 } 951 952 static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm, 953 struct iwl_rx_packet *pkt) 954 { 955 struct ieee80211_sta *sta; 956 u16 sequence = le16_to_cpu(pkt->hdr.sequence); 957 int txq_id = SEQ_TO_QUEUE(sequence); 958 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data; 959 int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid); 960 int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid); 961 u32 status = le16_to_cpu(tx_resp->status.status); 962 u16 ssn = iwl_mvm_get_scd_ssn(tx_resp); 963 struct iwl_mvm_sta *mvmsta; 964 struct sk_buff_head skbs; 965 u8 skb_freed = 0; 966 u16 next_reclaimed, seq_ctl; 967 bool is_ndp = false; 968 969 __skb_queue_head_init(&skbs); 970 971 seq_ctl = le16_to_cpu(tx_resp->seq_ctl); 972 973 /* we can free until ssn % q.n_bd not inclusive */ 974 iwl_trans_reclaim(mvm->trans, txq_id, ssn, &skbs); 975 976 while (!skb_queue_empty(&skbs)) { 977 struct sk_buff *skb = __skb_dequeue(&skbs); 978 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 979 980 skb_freed++; 981 982 iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]); 983 984 memset(&info->status, 0, sizeof(info->status)); 985 986 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 987 988 /* inform mac80211 about what happened with the frame */ 989 switch (status & TX_STATUS_MSK) { 990 case TX_STATUS_SUCCESS: 991 case TX_STATUS_DIRECT_DONE: 992 info->flags |= IEEE80211_TX_STAT_ACK; 993 break; 994 case TX_STATUS_FAIL_DEST_PS: 995 info->flags |= IEEE80211_TX_STAT_TX_FILTERED; 996 break; 997 default: 998 break; 999 } 1000 1001 iwl_mvm_tx_status_check_trigger(mvm, status); 1002 1003 info->status.rates[0].count = tx_resp->failure_frame + 1; 1004 iwl_mvm_hwrate_to_tx_status(le32_to_cpu(tx_resp->initial_rate), 1005 info); 1006 info->status.status_driver_data[1] = 1007 (void *)(uintptr_t)le32_to_cpu(tx_resp->initial_rate); 1008 1009 /* Single frame failure in an AMPDU queue => send BAR */ 1010 if (txq_id >= mvm->first_agg_queue && 1011 !(info->flags & IEEE80211_TX_STAT_ACK) && 1012 !(info->flags & IEEE80211_TX_STAT_TX_FILTERED)) 1013 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK; 1014 1015 /* W/A FW bug: seq_ctl is wrong when the status isn't success */ 1016 if (status != TX_STATUS_SUCCESS) { 1017 struct ieee80211_hdr *hdr = (void *)skb->data; 1018 seq_ctl = le16_to_cpu(hdr->seq_ctrl); 1019 } 1020 1021 if (unlikely(!seq_ctl)) { 1022 struct ieee80211_hdr *hdr = (void *)skb->data; 1023 1024 /* 1025 * If it is an NDP, we can't update next_reclaim since 1026 * its sequence control is 0. Note that for that same 1027 * reason, NDPs are never sent to A-MPDU'able queues 1028 * so that we can never have more than one freed frame 1029 * for a single Tx resonse (see WARN_ON below). 1030 */ 1031 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 1032 is_ndp = true; 1033 } 1034 1035 /* 1036 * TODO: this is not accurate if we are freeing more than one 1037 * packet. 1038 */ 1039 info->status.tx_time = 1040 le16_to_cpu(tx_resp->wireless_media_time); 1041 BUILD_BUG_ON(ARRAY_SIZE(info->status.status_driver_data) < 1); 1042 info->status.status_driver_data[0] = 1043 (void *)(uintptr_t)tx_resp->reduced_tpc; 1044 1045 ieee80211_tx_status(mvm->hw, skb); 1046 } 1047 1048 if (txq_id >= mvm->first_agg_queue) { 1049 /* If this is an aggregation queue, we use the ssn since: 1050 * ssn = wifi seq_num % 256. 1051 * The seq_ctl is the sequence control of the packet to which 1052 * this Tx response relates. But if there is a hole in the 1053 * bitmap of the BA we received, this Tx response may allow to 1054 * reclaim the hole and all the subsequent packets that were 1055 * already acked. In that case, seq_ctl != ssn, and the next 1056 * packet to be reclaimed will be ssn and not seq_ctl. In that 1057 * case, several packets will be reclaimed even if 1058 * frame_count = 1. 1059 * 1060 * The ssn is the index (% 256) of the latest packet that has 1061 * treated (acked / dropped) + 1. 1062 */ 1063 next_reclaimed = ssn; 1064 } else { 1065 /* The next packet to be reclaimed is the one after this one */ 1066 next_reclaimed = IEEE80211_SEQ_TO_SN(seq_ctl + 0x10); 1067 } 1068 1069 IWL_DEBUG_TX_REPLY(mvm, 1070 "TXQ %d status %s (0x%08x)\n", 1071 txq_id, iwl_mvm_get_tx_fail_reason(status), status); 1072 1073 IWL_DEBUG_TX_REPLY(mvm, 1074 "\t\t\t\tinitial_rate 0x%x retries %d, idx=%d ssn=%d next_reclaimed=0x%x seq_ctl=0x%x\n", 1075 le32_to_cpu(tx_resp->initial_rate), 1076 tx_resp->failure_frame, SEQ_TO_INDEX(sequence), 1077 ssn, next_reclaimed, seq_ctl); 1078 1079 rcu_read_lock(); 1080 1081 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]); 1082 /* 1083 * sta can't be NULL otherwise it'd mean that the sta has been freed in 1084 * the firmware while we still have packets for it in the Tx queues. 1085 */ 1086 if (WARN_ON_ONCE(!sta)) 1087 goto out; 1088 1089 if (!IS_ERR(sta)) { 1090 mvmsta = iwl_mvm_sta_from_mac80211(sta); 1091 1092 if (tid != IWL_TID_NON_QOS) { 1093 struct iwl_mvm_tid_data *tid_data = 1094 &mvmsta->tid_data[tid]; 1095 bool send_eosp_ndp = false; 1096 1097 spin_lock_bh(&mvmsta->lock); 1098 if (!is_ndp) { 1099 tid_data->next_reclaimed = next_reclaimed; 1100 IWL_DEBUG_TX_REPLY(mvm, 1101 "Next reclaimed packet:%d\n", 1102 next_reclaimed); 1103 } else { 1104 IWL_DEBUG_TX_REPLY(mvm, 1105 "NDP - don't update next_reclaimed\n"); 1106 } 1107 1108 iwl_mvm_check_ratid_empty(mvm, sta, tid); 1109 1110 if (mvmsta->sleep_tx_count) { 1111 mvmsta->sleep_tx_count--; 1112 if (mvmsta->sleep_tx_count && 1113 !iwl_mvm_tid_queued(tid_data)) { 1114 /* 1115 * The number of frames in the queue 1116 * dropped to 0 even if we sent less 1117 * frames than we thought we had on the 1118 * Tx queue. 1119 * This means we had holes in the BA 1120 * window that we just filled, ask 1121 * mac80211 to send EOSP since the 1122 * firmware won't know how to do that. 1123 * Send NDP and the firmware will send 1124 * EOSP notification that will trigger 1125 * a call to ieee80211_sta_eosp(). 1126 */ 1127 send_eosp_ndp = true; 1128 } 1129 } 1130 1131 spin_unlock_bh(&mvmsta->lock); 1132 if (send_eosp_ndp) { 1133 iwl_mvm_sta_modify_sleep_tx_count(mvm, sta, 1134 IEEE80211_FRAME_RELEASE_UAPSD, 1135 1, tid, false, false); 1136 mvmsta->sleep_tx_count = 0; 1137 ieee80211_send_eosp_nullfunc(sta, tid); 1138 } 1139 } 1140 1141 if (mvmsta->next_status_eosp) { 1142 mvmsta->next_status_eosp = false; 1143 ieee80211_sta_eosp(sta); 1144 } 1145 } else { 1146 mvmsta = NULL; 1147 } 1148 1149 /* 1150 * If the txq is not an AMPDU queue, there is no chance we freed 1151 * several skbs. Check that out... 1152 */ 1153 if (txq_id >= mvm->first_agg_queue) 1154 goto out; 1155 1156 /* We can't free more than one frame at once on a shared queue */ 1157 WARN_ON(skb_freed > 1); 1158 1159 /* If we have still frames for this STA nothing to do here */ 1160 if (!atomic_sub_and_test(skb_freed, &mvm->pending_frames[sta_id])) 1161 goto out; 1162 1163 if (mvmsta && mvmsta->vif->type == NL80211_IFTYPE_AP) { 1164 1165 /* 1166 * If there are no pending frames for this STA and 1167 * the tx to this station is not disabled, notify 1168 * mac80211 that this station can now wake up in its 1169 * STA table. 1170 * If mvmsta is not NULL, sta is valid. 1171 */ 1172 1173 spin_lock_bh(&mvmsta->lock); 1174 1175 if (!mvmsta->disable_tx) 1176 ieee80211_sta_block_awake(mvm->hw, sta, false); 1177 1178 spin_unlock_bh(&mvmsta->lock); 1179 } 1180 1181 if (PTR_ERR(sta) == -EBUSY || PTR_ERR(sta) == -ENOENT) { 1182 /* 1183 * We are draining and this was the last packet - pre_rcu_remove 1184 * has been called already. We might be after the 1185 * synchronize_net already. 1186 * Don't rely on iwl_mvm_rm_sta to see the empty Tx queues. 1187 */ 1188 set_bit(sta_id, mvm->sta_drained); 1189 schedule_work(&mvm->sta_drained_wk); 1190 } 1191 1192 out: 1193 rcu_read_unlock(); 1194 } 1195 1196 #ifdef CONFIG_IWLWIFI_DEBUG 1197 #define AGG_TX_STATE_(x) case AGG_TX_STATE_ ## x: return #x 1198 static const char *iwl_get_agg_tx_status(u16 status) 1199 { 1200 switch (status & AGG_TX_STATE_STATUS_MSK) { 1201 AGG_TX_STATE_(TRANSMITTED); 1202 AGG_TX_STATE_(UNDERRUN); 1203 AGG_TX_STATE_(BT_PRIO); 1204 AGG_TX_STATE_(FEW_BYTES); 1205 AGG_TX_STATE_(ABORT); 1206 AGG_TX_STATE_(LAST_SENT_TTL); 1207 AGG_TX_STATE_(LAST_SENT_TRY_CNT); 1208 AGG_TX_STATE_(LAST_SENT_BT_KILL); 1209 AGG_TX_STATE_(SCD_QUERY); 1210 AGG_TX_STATE_(TEST_BAD_CRC32); 1211 AGG_TX_STATE_(RESPONSE); 1212 AGG_TX_STATE_(DUMP_TX); 1213 AGG_TX_STATE_(DELAY_TX); 1214 } 1215 1216 return "UNKNOWN"; 1217 } 1218 1219 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm, 1220 struct iwl_rx_packet *pkt) 1221 { 1222 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data; 1223 struct agg_tx_status *frame_status = &tx_resp->status; 1224 int i; 1225 1226 for (i = 0; i < tx_resp->frame_count; i++) { 1227 u16 fstatus = le16_to_cpu(frame_status[i].status); 1228 1229 IWL_DEBUG_TX_REPLY(mvm, 1230 "status %s (0x%04x), try-count (%d) seq (0x%x)\n", 1231 iwl_get_agg_tx_status(fstatus), 1232 fstatus & AGG_TX_STATE_STATUS_MSK, 1233 (fstatus & AGG_TX_STATE_TRY_CNT_MSK) >> 1234 AGG_TX_STATE_TRY_CNT_POS, 1235 le16_to_cpu(frame_status[i].sequence)); 1236 } 1237 } 1238 #else 1239 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm, 1240 struct iwl_rx_packet *pkt) 1241 {} 1242 #endif /* CONFIG_IWLWIFI_DEBUG */ 1243 1244 static void iwl_mvm_rx_tx_cmd_agg(struct iwl_mvm *mvm, 1245 struct iwl_rx_packet *pkt) 1246 { 1247 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data; 1248 int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid); 1249 int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid); 1250 u16 sequence = le16_to_cpu(pkt->hdr.sequence); 1251 struct ieee80211_sta *sta; 1252 1253 if (WARN_ON_ONCE(SEQ_TO_QUEUE(sequence) < mvm->first_agg_queue)) 1254 return; 1255 1256 if (WARN_ON_ONCE(tid == IWL_TID_NON_QOS)) 1257 return; 1258 1259 iwl_mvm_rx_tx_cmd_agg_dbg(mvm, pkt); 1260 1261 rcu_read_lock(); 1262 1263 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]); 1264 1265 if (!WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) { 1266 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1267 mvmsta->tid_data[tid].rate_n_flags = 1268 le32_to_cpu(tx_resp->initial_rate); 1269 mvmsta->tid_data[tid].tx_time = 1270 le16_to_cpu(tx_resp->wireless_media_time); 1271 } 1272 1273 rcu_read_unlock(); 1274 } 1275 1276 void iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb) 1277 { 1278 struct iwl_rx_packet *pkt = rxb_addr(rxb); 1279 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data; 1280 1281 if (tx_resp->frame_count == 1) 1282 iwl_mvm_rx_tx_cmd_single(mvm, pkt); 1283 else 1284 iwl_mvm_rx_tx_cmd_agg(mvm, pkt); 1285 } 1286 1287 static void iwl_mvm_tx_info_from_ba_notif(struct ieee80211_tx_info *info, 1288 struct iwl_mvm_ba_notif *ba_notif, 1289 struct iwl_mvm_tid_data *tid_data) 1290 { 1291 info->flags |= IEEE80211_TX_STAT_AMPDU; 1292 info->status.ampdu_ack_len = ba_notif->txed_2_done; 1293 info->status.ampdu_len = ba_notif->txed; 1294 iwl_mvm_hwrate_to_tx_status(tid_data->rate_n_flags, 1295 info); 1296 /* TODO: not accounted if the whole A-MPDU failed */ 1297 info->status.tx_time = tid_data->tx_time; 1298 info->status.status_driver_data[0] = 1299 (void *)(uintptr_t)ba_notif->reduced_txp; 1300 info->status.status_driver_data[1] = 1301 (void *)(uintptr_t)tid_data->rate_n_flags; 1302 } 1303 1304 void iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb) 1305 { 1306 struct iwl_rx_packet *pkt = rxb_addr(rxb); 1307 struct iwl_mvm_ba_notif *ba_notif = (void *)pkt->data; 1308 struct sk_buff_head reclaimed_skbs; 1309 struct iwl_mvm_tid_data *tid_data; 1310 struct ieee80211_sta *sta; 1311 struct iwl_mvm_sta *mvmsta; 1312 struct sk_buff *skb; 1313 int sta_id, tid, freed; 1314 /* "flow" corresponds to Tx queue */ 1315 u16 scd_flow = le16_to_cpu(ba_notif->scd_flow); 1316 /* "ssn" is start of block-ack Tx window, corresponds to index 1317 * (in Tx queue's circular buffer) of first TFD/frame in window */ 1318 u16 ba_resp_scd_ssn = le16_to_cpu(ba_notif->scd_ssn); 1319 1320 sta_id = ba_notif->sta_id; 1321 tid = ba_notif->tid; 1322 1323 if (WARN_ONCE(sta_id >= IWL_MVM_STATION_COUNT || 1324 tid >= IWL_MAX_TID_COUNT, 1325 "sta_id %d tid %d", sta_id, tid)) 1326 return; 1327 1328 rcu_read_lock(); 1329 1330 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]); 1331 1332 /* Reclaiming frames for a station that has been deleted ? */ 1333 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) { 1334 rcu_read_unlock(); 1335 return; 1336 } 1337 1338 mvmsta = iwl_mvm_sta_from_mac80211(sta); 1339 tid_data = &mvmsta->tid_data[tid]; 1340 1341 if (tid_data->txq_id != scd_flow) { 1342 IWL_ERR(mvm, 1343 "invalid BA notification: Q %d, tid %d, flow %d\n", 1344 tid_data->txq_id, tid, scd_flow); 1345 rcu_read_unlock(); 1346 return; 1347 } 1348 1349 spin_lock_bh(&mvmsta->lock); 1350 1351 __skb_queue_head_init(&reclaimed_skbs); 1352 1353 /* 1354 * Release all TFDs before the SSN, i.e. all TFDs in front of 1355 * block-ack window (we assume that they've been successfully 1356 * transmitted ... if not, it's too late anyway). 1357 */ 1358 iwl_trans_reclaim(mvm->trans, scd_flow, ba_resp_scd_ssn, 1359 &reclaimed_skbs); 1360 1361 IWL_DEBUG_TX_REPLY(mvm, 1362 "BA_NOTIFICATION Received from %pM, sta_id = %d\n", 1363 (u8 *)&ba_notif->sta_addr_lo32, 1364 ba_notif->sta_id); 1365 IWL_DEBUG_TX_REPLY(mvm, 1366 "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n", 1367 ba_notif->tid, le16_to_cpu(ba_notif->seq_ctl), 1368 (unsigned long long)le64_to_cpu(ba_notif->bitmap), 1369 scd_flow, ba_resp_scd_ssn, ba_notif->txed, 1370 ba_notif->txed_2_done); 1371 1372 IWL_DEBUG_TX_REPLY(mvm, "reduced txp from ba notif %d\n", 1373 ba_notif->reduced_txp); 1374 tid_data->next_reclaimed = ba_resp_scd_ssn; 1375 1376 iwl_mvm_check_ratid_empty(mvm, sta, tid); 1377 1378 freed = 0; 1379 1380 skb_queue_walk(&reclaimed_skbs, skb) { 1381 struct ieee80211_hdr *hdr = (void *)skb->data; 1382 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1383 1384 if (ieee80211_is_data_qos(hdr->frame_control)) 1385 freed++; 1386 else 1387 WARN_ON_ONCE(1); 1388 1389 iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]); 1390 1391 memset(&info->status, 0, sizeof(info->status)); 1392 /* Packet was transmitted successfully, failures come as single 1393 * frames because before failing a frame the firmware transmits 1394 * it without aggregation at least once. 1395 */ 1396 info->flags |= IEEE80211_TX_STAT_ACK; 1397 1398 /* this is the first skb we deliver in this batch */ 1399 /* put the rate scaling data there */ 1400 if (freed == 1) 1401 iwl_mvm_tx_info_from_ba_notif(info, ba_notif, tid_data); 1402 } 1403 1404 spin_unlock_bh(&mvmsta->lock); 1405 1406 /* We got a BA notif with 0 acked or scd_ssn didn't progress which is 1407 * possible (i.e. first MPDU in the aggregation wasn't acked) 1408 * Still it's important to update RS about sent vs. acked. 1409 */ 1410 if (skb_queue_empty(&reclaimed_skbs)) { 1411 struct ieee80211_tx_info ba_info = {}; 1412 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 1413 1414 if (mvmsta->vif) 1415 chanctx_conf = 1416 rcu_dereference(mvmsta->vif->chanctx_conf); 1417 1418 if (WARN_ON_ONCE(!chanctx_conf)) 1419 goto out; 1420 1421 ba_info.band = chanctx_conf->def.chan->band; 1422 iwl_mvm_tx_info_from_ba_notif(&ba_info, ba_notif, tid_data); 1423 1424 IWL_DEBUG_TX_REPLY(mvm, "No reclaim. Update rs directly\n"); 1425 iwl_mvm_rs_tx_status(mvm, sta, tid, &ba_info); 1426 } 1427 1428 out: 1429 rcu_read_unlock(); 1430 1431 while (!skb_queue_empty(&reclaimed_skbs)) { 1432 skb = __skb_dequeue(&reclaimed_skbs); 1433 ieee80211_tx_status(mvm->hw, skb); 1434 } 1435 } 1436 1437 /* 1438 * Note that there are transports that buffer frames before they reach 1439 * the firmware. This means that after flush_tx_path is called, the 1440 * queue might not be empty. The race-free way to handle this is to: 1441 * 1) set the station as draining 1442 * 2) flush the Tx path 1443 * 3) wait for the transport queues to be empty 1444 */ 1445 int iwl_mvm_flush_tx_path(struct iwl_mvm *mvm, u32 tfd_msk, u32 flags) 1446 { 1447 int ret; 1448 struct iwl_tx_path_flush_cmd flush_cmd = { 1449 .queues_ctl = cpu_to_le32(tfd_msk), 1450 .flush_ctl = cpu_to_le16(DUMP_TX_FIFO_FLUSH), 1451 }; 1452 1453 ret = iwl_mvm_send_cmd_pdu(mvm, TXPATH_FLUSH, flags, 1454 sizeof(flush_cmd), &flush_cmd); 1455 if (ret) 1456 IWL_ERR(mvm, "Failed to send flush command (%d)\n", ret); 1457 return ret; 1458 } 1459