drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c

   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) 2017 Intel Deutschland GmbH
   9  * Copyright(c) 2018        Intel Corporation
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of version 2 of the GNU General Public License as
  13  * published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * BSD LICENSE
  21  *
  22  * Copyright(c) 2017 Intel Deutschland GmbH
  23  * Copyright(c) 2018        Intel Corporation
  24  * All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  *
  30  *  * Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  *  * Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in
  34  *    the documentation and/or other materials provided with the
  35  *    distribution.
  36  *  * Neither the name Intel Corporation nor the names of its
  37  *    contributors may be used to endorse or promote products derived
  38  *    from this software without specific prior written permission.
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  41  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  42  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  43  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  44  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  46  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  47  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  48  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  49  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  50  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  51  *
  52  *****************************************************************************/
  53 #include <linux/pm_runtime.h>
  54 #include <net/tso.h>
  55 #include <linux/tcp.h>
  56
  57 #include "iwl-debug.h"
  58 #include "iwl-csr.h"
  59 #include "iwl-io.h"
  60 #include "internal.h"
  61 #include "fw/api/tx.h"
  62
  63  /*
  64  * iwl_pcie_gen2_tx_stop - Stop all Tx DMA channels
  65  */
  66 void iwl_pcie_gen2_tx_stop(struct iwl_trans *trans)
  67 {
  68         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
  69         int txq_id;
  70
  71         /*
  72          * This function can be called before the op_mode disabled the
  73          * queues. This happens when we have an rfkill interrupt.
  74          * Since we stop Tx altogether - mark the queues as stopped.
  75          */
  76         memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped));
  77         memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used));
  78
  79         /* Unmap DMA from host system and free skb's */
  80         for (txq_id = 0; txq_id < ARRAY_SIZE(trans_pcie->txq); txq_id++) {
  81                 if (!trans_pcie->txq[txq_id])
  82                         continue;
  83                 iwl_pcie_gen2_txq_unmap(trans, txq_id);
  84         }
  85 }
  86
  87 /*
  88  * iwl_pcie_txq_update_byte_tbl - Set up entry in Tx byte-count array
  89  */
  90 static void iwl_pcie_gen2_update_byte_tbl(struct iwl_trans_pcie *trans_pcie,
  91                                           struct iwl_txq *txq, u16 byte_cnt,
  92                                           int num_tbs)
  93 {
  94         struct iwlagn_scd_bc_tbl *scd_bc_tbl = txq->bc_tbl.addr;
  95         struct iwl_trans *trans = iwl_trans_pcie_get_trans(trans_pcie);
  96         struct iwl_gen3_bc_tbl *scd_bc_tbl_gen3 = txq->bc_tbl.addr;
  97         int idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr);
  98         u8 filled_tfd_size, num_fetch_chunks;
  99         u16 len = byte_cnt;
 100         __le16 bc_ent;
 101
 102         if (trans_pcie->bc_table_dword)
 103                 len = DIV_ROUND_UP(len, 4);
 104
 105         if (WARN_ON(len > 0xFFF || idx >= txq->n_window))
 106                 return;
 107
 108         filled_tfd_size = offsetof(struct iwl_tfh_tfd, tbs) +
 109                                    num_tbs * sizeof(struct iwl_tfh_tb);
 110         /*
 111          * filled_tfd_size contains the number of filled bytes in the TFD.
 112          * Dividing it by 64 will give the number of chunks to fetch
 113          * to SRAM- 0 for one chunk, 1 for 2 and so on.
 114          * If, for example, TFD contains only 3 TBs then 32 bytes
 115          * of the TFD are used, and only one chunk of 64 bytes should
 116          * be fetched
 117          */
 118         num_fetch_chunks = DIV_ROUND_UP(filled_tfd_size, 64) - 1;
 119
 120         bc_ent = cpu_to_le16(len | (num_fetch_chunks << 12));
 121         if (trans->cfg->device_family >= IWL_DEVICE_FAMILY_22560)
 122                 scd_bc_tbl_gen3->tfd_offset[idx] = bc_ent;
 123         else
 124                 scd_bc_tbl->tfd_offset[idx] = bc_ent;
 125 }
 126
 127 /*
 128  * iwl_pcie_gen2_txq_inc_wr_ptr - Send new write index to hardware
 129  */
 130 static void iwl_pcie_gen2_txq_inc_wr_ptr(struct iwl_trans *trans,
 131                                          struct iwl_txq *txq)
 132 {
 133         lockdep_assert_held(&txq->lock);
 134
 135         IWL_DEBUG_TX(trans, "Q:%d WR: 0x%x\n", txq->id, txq->write_ptr);
 136
 137         /*
 138          * if not in power-save mode, uCode will never sleep when we're
 139          * trying to tx (during RFKILL, we're not trying to tx).
 140          */
 141         iwl_write32(trans, HBUS_TARG_WRPTR, txq->write_ptr | (txq->id << 16));
 142 }
 143
 144 static u8 iwl_pcie_gen2_get_num_tbs(struct iwl_trans *trans,
 145                                     struct iwl_tfh_tfd *tfd)
 146 {
 147         return le16_to_cpu(tfd->num_tbs) & 0x1f;
 148 }
 149
 150 static void iwl_pcie_gen2_tfd_unmap(struct iwl_trans *trans,
 151                                     struct iwl_cmd_meta *meta,
 152                                     struct iwl_tfh_tfd *tfd)
 153 {
 154         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 155         int i, num_tbs;
 156
 157         /* Sanity check on number of chunks */
 158         num_tbs = iwl_pcie_gen2_get_num_tbs(trans, tfd);
 159
 160         if (num_tbs > trans_pcie->max_tbs) {
 161                 IWL_ERR(trans, "Too many chunks: %i\n", num_tbs);
 162                 return;
 163         }
 164
 165         /* first TB is never freed - it's the bidirectional DMA data */
 166         for (i = 1; i < num_tbs; i++) {
 167                 if (meta->tbs & BIT(i))
 168                         dma_unmap_page(trans->dev,
 169                                        le64_to_cpu(tfd->tbs[i].addr),
 170                                        le16_to_cpu(tfd->tbs[i].tb_len),
 171                                        DMA_TO_DEVICE);
 172                 else
 173                         dma_unmap_single(trans->dev,
 174                                          le64_to_cpu(tfd->tbs[i].addr),
 175                                          le16_to_cpu(tfd->tbs[i].tb_len),
 176                                          DMA_TO_DEVICE);
 177         }
 178
 179         tfd->num_tbs = 0;
 180 }
 181
 182 static void iwl_pcie_gen2_free_tfd(struct iwl_trans *trans, struct iwl_txq *txq)
 183 {
 184         /* rd_ptr is bounded by TFD_QUEUE_SIZE_MAX and
 185          * idx is bounded by n_window
 186          */
 187         int idx = iwl_pcie_get_cmd_index(txq, txq->read_ptr);
 188
 189         lockdep_assert_held(&txq->lock);
 190
 191         iwl_pcie_gen2_tfd_unmap(trans, &txq->entries[idx].meta,
 192                                 iwl_pcie_get_tfd(trans, txq, idx));
 193
 194         /* free SKB */
 195         if (txq->entries) {
 196                 struct sk_buff *skb;
 197
 198                 skb = txq->entries[idx].skb;
 199
 200                 /* Can be called from irqs-disabled context
 201                  * If skb is not NULL, it means that the whole queue is being
 202                  * freed and that the queue is not empty - free the skb
 203                  */
 204                 if (skb) {
 205                         iwl_op_mode_free_skb(trans->op_mode, skb);
 206                         txq->entries[idx].skb = NULL;
 207                 }
 208         }
 209 }
 210
 211 static int iwl_pcie_gen2_set_tb(struct iwl_trans *trans,
 212                                 struct iwl_tfh_tfd *tfd, dma_addr_t addr,
 213                                 u16 len)
 214 {
 215         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 216         int idx = iwl_pcie_gen2_get_num_tbs(trans, tfd);
 217         struct iwl_tfh_tb *tb = &tfd->tbs[idx];
 218
 219         /* Each TFD can point to a maximum max_tbs Tx buffers */
 220         if (le16_to_cpu(tfd->num_tbs) >= trans_pcie->max_tbs) {
 221                 IWL_ERR(trans, "Error can not send more than %d chunks\n",
 222                         trans_pcie->max_tbs);
 223                 return -EINVAL;
 224         }
 225
 226         put_unaligned_le64(addr, &tb->addr);
 227         tb->tb_len = cpu_to_le16(len);
 228
 229         tfd->num_tbs = cpu_to_le16(idx + 1);
 230
 231         return idx;
 232 }
 233
 234 static int iwl_pcie_gen2_build_amsdu(struct iwl_trans *trans,
 235                                      struct sk_buff *skb,
 236                                      struct iwl_tfh_tfd *tfd, int start_len,
 237                                      u8 hdr_len, struct iwl_device_cmd *dev_cmd)
 238 {
 239 #ifdef CONFIG_INET
 240         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 241         struct iwl_tx_cmd *tx_cmd = (void *)dev_cmd->payload;
 242         struct ieee80211_hdr *hdr = (void *)skb->data;
 243         unsigned int snap_ip_tcp_hdrlen, ip_hdrlen, total_len, hdr_room;
 244         unsigned int mss = skb_shinfo(skb)->gso_size;
 245         u16 length, amsdu_pad;
 246         u8 *start_hdr;
 247         struct iwl_tso_hdr_page *hdr_page;
 248         struct page **page_ptr;
 249         struct tso_t tso;
 250
 251         trace_iwlwifi_dev_tx(trans->dev, skb, tfd, sizeof(*tfd),
 252                              &dev_cmd->hdr, start_len, 0);
 253
 254         ip_hdrlen = skb_transport_header(skb) - skb_network_header(skb);
 255         snap_ip_tcp_hdrlen = 8 + ip_hdrlen + tcp_hdrlen(skb);
 256         total_len = skb->len - snap_ip_tcp_hdrlen - hdr_len;
 257         amsdu_pad = 0;
 258
 259         /* total amount of header we may need for this A-MSDU */
 260         hdr_room = DIV_ROUND_UP(total_len, mss) *
 261                 (3 + snap_ip_tcp_hdrlen + sizeof(struct ethhdr));
 262
 263         /* Our device supports 9 segments at most, it will fit in 1 page */
 264         hdr_page = get_page_hdr(trans, hdr_room);
 265         if (!hdr_page)
 266                 return -ENOMEM;
 267
 268         get_page(hdr_page->page);
 269         start_hdr = hdr_page->pos;
 270         page_ptr = (void *)((u8 *)skb->cb + trans_pcie->page_offs);
 271         *page_ptr = hdr_page->page;
 272
 273         /*
 274          * Pull the ieee80211 header to be able to use TSO core,
 275          * we will restore it for the tx_status flow.
 276          */
 277         skb_pull(skb, hdr_len);
 278
 279         /*
 280          * Remove the length of all the headers that we don't actually
 281          * have in the MPDU by themselves, but that we duplicate into
 282          * all the different MSDUs inside the A-MSDU.
 283          */
 284         le16_add_cpu(&tx_cmd->len, -snap_ip_tcp_hdrlen);
 285
 286         tso_start(skb, &tso);
 287
 288         while (total_len) {
 289                 /* this is the data left for this subframe */
 290                 unsigned int data_left = min_t(unsigned int, mss, total_len);
 291                 struct sk_buff *csum_skb = NULL;
 292                 unsigned int tb_len;
 293                 dma_addr_t tb_phys;
 294                 u8 *subf_hdrs_start = hdr_page->pos;
 295
 296                 total_len -= data_left;
 297
 298                 memset(hdr_page->pos, 0, amsdu_pad);
 299                 hdr_page->pos += amsdu_pad;
 300                 amsdu_pad = (4 - (sizeof(struct ethhdr) + snap_ip_tcp_hdrlen +
 301                                   data_left)) & 0x3;
 302                 ether_addr_copy(hdr_page->pos, ieee80211_get_DA(hdr));
 303                 hdr_page->pos += ETH_ALEN;
 304                 ether_addr_copy(hdr_page->pos, ieee80211_get_SA(hdr));
 305                 hdr_page->pos += ETH_ALEN;
 306
 307                 length = snap_ip_tcp_hdrlen + data_left;
 308                 *((__be16 *)hdr_page->pos) = cpu_to_be16(length);
 309                 hdr_page->pos += sizeof(length);
 310
 311                 /*
 312                  * This will copy the SNAP as well which will be considered
 313                  * as MAC header.
 314                  */
 315                 tso_build_hdr(skb, hdr_page->pos, &tso, data_left, !total_len);
 316
 317                 hdr_page->pos += snap_ip_tcp_hdrlen;
 318
 319                 tb_len = hdr_page->pos - start_hdr;
 320                 tb_phys = dma_map_single(trans->dev, start_hdr,
 321                                          tb_len, DMA_TO_DEVICE);
 322                 if (unlikely(dma_mapping_error(trans->dev, tb_phys))) {
 323                         dev_kfree_skb(csum_skb);
 324                         goto out_err;
 325                 }
 326                 iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, tb_len);
 327                 trace_iwlwifi_dev_tx_tso_chunk(trans->dev, start_hdr, tb_len);
 328                 /* add this subframe's headers' length to the tx_cmd */
 329                 le16_add_cpu(&tx_cmd->len, hdr_page->pos - subf_hdrs_start);
 330
 331                 /* prepare the start_hdr for the next subframe */
 332                 start_hdr = hdr_page->pos;
 333
 334                 /* put the payload */
 335                 while (data_left) {
 336                         tb_len = min_t(unsigned int, tso.size, data_left);
 337                         tb_phys = dma_map_single(trans->dev, tso.data,
 338                                                  tb_len, DMA_TO_DEVICE);
 339                         if (unlikely(dma_mapping_error(trans->dev, tb_phys))) {
 340                                 dev_kfree_skb(csum_skb);
 341                                 goto out_err;
 342                         }
 343                         iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, tb_len);
 344                         trace_iwlwifi_dev_tx_tso_chunk(trans->dev, tso.data,
 345                                                        tb_len);
 346
 347                         data_left -= tb_len;
 348                         tso_build_data(skb, &tso, tb_len);
 349                 }
 350         }
 351
 352         /* re -add the WiFi header */
 353         skb_push(skb, hdr_len);
 354
 355         return 0;
 356
 357 out_err:
 358 #endif
 359         return -EINVAL;
 360 }
 361
 362 static struct
 363 iwl_tfh_tfd *iwl_pcie_gen2_build_tx_amsdu(struct iwl_trans *trans,
 364                                           struct iwl_txq *txq,
 365                                           struct iwl_device_cmd *dev_cmd,
 366                                           struct sk_buff *skb,
 367                                           struct iwl_cmd_meta *out_meta,
 368                                           int hdr_len,
 369                                           int tx_cmd_len)
 370 {
 371         int idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr);
 372         struct iwl_tfh_tfd *tfd = iwl_pcie_get_tfd(trans, txq, idx);
 373         dma_addr_t tb_phys;
 374         int len;
 375         void *tb1_addr;
 376
 377         tb_phys = iwl_pcie_get_first_tb_dma(txq, idx);
 378
 379         iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, IWL_FIRST_TB_SIZE);
 380
 381         /*
 382          * The second TB (tb1) points to the remainder of the TX command
 383          * and the 802.11 header - dword aligned size
 384          * (This calculation modifies the TX command, so do it before the
 385          * setup of the first TB)
 386          */
 387         len = tx_cmd_len + sizeof(struct iwl_cmd_header) + hdr_len -
 388               IWL_FIRST_TB_SIZE;
 389
 390         /* do not align A-MSDU to dword as the subframe header aligns it */
 391
 392         /* map the data for TB1 */
 393         tb1_addr = ((u8 *)&dev_cmd->hdr) + IWL_FIRST_TB_SIZE;
 394         tb_phys = dma_map_single(trans->dev, tb1_addr, len, DMA_TO_DEVICE);
 395         if (unlikely(dma_mapping_error(trans->dev, tb_phys)))
 396                 goto out_err;
 397         iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, len);
 398
 399         if (iwl_pcie_gen2_build_amsdu(trans, skb, tfd,
 400                                       len + IWL_FIRST_TB_SIZE,
 401                                       hdr_len, dev_cmd))
 402                 goto out_err;
 403
 404         /* building the A-MSDU might have changed this data, memcpy it now */
 405         memcpy(&txq->first_tb_bufs[idx], &dev_cmd->hdr, IWL_FIRST_TB_SIZE);
 406         return tfd;
 407
 408 out_err:
 409         iwl_pcie_gen2_tfd_unmap(trans, out_meta, tfd);
 410         return NULL;
 411 }
 412
 413 static struct
 414 iwl_tfh_tfd *iwl_pcie_gen2_build_tx(struct iwl_trans *trans,
 415                                     struct iwl_txq *txq,
 416                                     struct iwl_device_cmd *dev_cmd,
 417                                     struct sk_buff *skb,
 418                                     struct iwl_cmd_meta *out_meta,
 419                                     int hdr_len,
 420                                     int tx_cmd_len)
 421 {
 422         int idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr);
 423         struct iwl_tfh_tfd *tfd = iwl_pcie_get_tfd(trans, txq, idx);
 424         dma_addr_t tb_phys;
 425         int i, len, tb1_len, tb2_len;
 426         void *tb1_addr;
 427
 428         tb_phys = iwl_pcie_get_first_tb_dma(txq, idx);
 429
 430         /* The first TB points to bi-directional DMA data */
 431         memcpy(&txq->first_tb_bufs[idx], &dev_cmd->hdr, IWL_FIRST_TB_SIZE);
 432
 433         iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, IWL_FIRST_TB_SIZE);
 434
 435         /*
 436          * The second TB (tb1) points to the remainder of the TX command
 437          * and the 802.11 header - dword aligned size
 438          * (This calculation modifies the TX command, so do it before the
 439          * setup of the first TB)
 440          */
 441         len = tx_cmd_len + sizeof(struct iwl_cmd_header) + hdr_len -
 442               IWL_FIRST_TB_SIZE;
 443
 444         tb1_len = ALIGN(len, 4);
 445
 446         /* map the data for TB1 */
 447         tb1_addr = ((u8 *)&dev_cmd->hdr) + IWL_FIRST_TB_SIZE;
 448         tb_phys = dma_map_single(trans->dev, tb1_addr, tb1_len, DMA_TO_DEVICE);
 449         if (unlikely(dma_mapping_error(trans->dev, tb_phys)))
 450                 goto out_err;
 451         iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, tb1_len);
 452
 453         /* set up TFD's third entry to point to remainder of skb's head */
 454         tb2_len = skb_headlen(skb) - hdr_len;
 455
 456         if (tb2_len > 0) {
 457                 tb_phys = dma_map_single(trans->dev, skb->data + hdr_len,
 458                                          tb2_len, DMA_TO_DEVICE);
 459                 if (unlikely(dma_mapping_error(trans->dev, tb_phys)))
 460                         goto out_err;
 461                 iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, tb2_len);
 462         }
 463
 464         /* set up the remaining entries to point to the data */
 465         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 466                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 467                 int tb_idx;
 468
 469                 if (!skb_frag_size(frag))
 470                         continue;
 471
 472                 tb_phys = skb_frag_dma_map(trans->dev, frag, 0,
 473                                            skb_frag_size(frag), DMA_TO_DEVICE);
 474
 475                 if (unlikely(dma_mapping_error(trans->dev, tb_phys)))
 476                         goto out_err;
 477                 tb_idx = iwl_pcie_gen2_set_tb(trans, tfd, tb_phys,
 478                                               skb_frag_size(frag));
 479
 480                 out_meta->tbs |= BIT(tb_idx);
 481         }
 482
 483         trace_iwlwifi_dev_tx(trans->dev, skb, tfd, sizeof(*tfd), &dev_cmd->hdr,
 484                              IWL_FIRST_TB_SIZE + tb1_len, hdr_len);
 485         trace_iwlwifi_dev_tx_data(trans->dev, skb, hdr_len);
 486
 487         return tfd;
 488
 489 out_err:
 490         iwl_pcie_gen2_tfd_unmap(trans, out_meta, tfd);
 491         return NULL;
 492 }
 493
 494 static
 495 struct iwl_tfh_tfd *iwl_pcie_gen2_build_tfd(struct iwl_trans *trans,
 496                                             struct iwl_txq *txq,
 497                                             struct iwl_device_cmd *dev_cmd,
 498                                             struct sk_buff *skb,
 499                                             struct iwl_cmd_meta *out_meta)
 500 {
 501         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 502         int idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr);
 503         struct iwl_tfh_tfd *tfd = iwl_pcie_get_tfd(trans, txq, idx);
 504         int len, hdr_len;
 505         bool amsdu;
 506
 507         /* There must be data left over for TB1 or this code must be changed */
 508         BUILD_BUG_ON(sizeof(struct iwl_tx_cmd_gen2) < IWL_FIRST_TB_SIZE);
 509
 510         memset(tfd, 0, sizeof(*tfd));
 511
 512         if (trans->cfg->device_family < IWL_DEVICE_FAMILY_22560)
 513                 len = sizeof(struct iwl_tx_cmd_gen2);
 514         else
 515                 len = sizeof(struct iwl_tx_cmd_gen3);
 516
 517         amsdu = ieee80211_is_data_qos(hdr->frame_control) &&
 518                         (*ieee80211_get_qos_ctl(hdr) &
 519                          IEEE80211_QOS_CTL_A_MSDU_PRESENT);
 520
 521         hdr_len = ieee80211_hdrlen(hdr->frame_control);
 522
 523         /*
 524          * Only build A-MSDUs here if doing so by GSO, otherwise it may be
 525          * an A-MSDU for other reasons, e.g. NAN or an A-MSDU having been
 526          * built in the higher layers already.
 527          */
 528         if (amsdu && skb_shinfo(skb)->gso_size)
 529                 return iwl_pcie_gen2_build_tx_amsdu(trans, txq, dev_cmd, skb,
 530                                                     out_meta, hdr_len, len);
 531
 532         return iwl_pcie_gen2_build_tx(trans, txq, dev_cmd, skb, out_meta,
 533                                       hdr_len, len);
 534 }
 535
 536 int iwl_trans_pcie_gen2_tx(struct iwl_trans *trans, struct sk_buff *skb,
 537                            struct iwl_device_cmd *dev_cmd, int txq_id)
 538 {
 539         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 540         struct iwl_cmd_meta *out_meta;
 541         struct iwl_txq *txq = trans_pcie->txq[txq_id];
 542         u16 cmd_len;
 543         int idx;
 544         void *tfd;
 545
 546         if (WARN_ONCE(!test_bit(txq_id, trans_pcie->queue_used),
 547                       "TX on unused queue %d\n", txq_id))
 548                 return -EINVAL;
 549
 550         if (skb_is_nonlinear(skb) &&
 551             skb_shinfo(skb)->nr_frags > IWL_PCIE_MAX_FRAGS(trans_pcie) &&
 552             __skb_linearize(skb))
 553                 return -ENOMEM;
 554
 555         spin_lock(&txq->lock);
 556
 557         if (iwl_queue_space(trans, txq) < txq->high_mark) {
 558                 iwl_stop_queue(trans, txq);
 559
 560                 /* don't put the packet on the ring, if there is no room */
 561                 if (unlikely(iwl_queue_space(trans, txq) < 3)) {
 562                         struct iwl_device_cmd **dev_cmd_ptr;
 563
 564                         dev_cmd_ptr = (void *)((u8 *)skb->cb +
 565                                                trans_pcie->dev_cmd_offs);
 566
 567                         *dev_cmd_ptr = dev_cmd;
 568                         __skb_queue_tail(&txq->overflow_q, skb);
 569                         spin_unlock(&txq->lock);
 570                         return 0;
 571                 }
 572         }
 573
 574         idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr);
 575
 576         /* Set up driver data for this TFD */
 577         txq->entries[idx].skb = skb;
 578         txq->entries[idx].cmd = dev_cmd;
 579
 580         dev_cmd->hdr.sequence =
 581                 cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
 582                             INDEX_TO_SEQ(idx)));
 583
 584         /* Set up first empty entry in queue's array of Tx/cmd buffers */
 585         out_meta = &txq->entries[idx].meta;
 586         out_meta->flags = 0;
 587
 588         tfd = iwl_pcie_gen2_build_tfd(trans, txq, dev_cmd, skb, out_meta);
 589         if (!tfd) {
 590                 spin_unlock(&txq->lock);
 591                 return -1;
 592         }
 593
 594         if (trans->cfg->device_family >= IWL_DEVICE_FAMILY_22560) {
 595                 struct iwl_tx_cmd_gen3 *tx_cmd_gen3 =
 596                         (void *)dev_cmd->payload;
 597
 598                 cmd_len = le16_to_cpu(tx_cmd_gen3->len);
 599         } else {
 600                 struct iwl_tx_cmd_gen2 *tx_cmd_gen2 =
 601                         (void *)dev_cmd->payload;
 602
 603                 cmd_len = le16_to_cpu(tx_cmd_gen2->len);
 604         }
 605
 606         /* Set up entry for this TFD in Tx byte-count array */
 607         iwl_pcie_gen2_update_byte_tbl(trans_pcie, txq, cmd_len,
 608                                       iwl_pcie_gen2_get_num_tbs(trans, tfd));
 609
 610         /* start timer if queue currently empty */
 611         if (txq->read_ptr == txq->write_ptr) {
 612                 if (txq->wd_timeout)
 613                         mod_timer(&txq->stuck_timer, jiffies + txq->wd_timeout);
 614                 IWL_DEBUG_RPM(trans, "Q: %d first tx - take ref\n", txq->id);
 615                 iwl_trans_ref(trans);
 616         }
 617
 618         /* Tell device the write index *just past* this latest filled TFD */
 619         txq->write_ptr = iwl_queue_inc_wrap(trans, txq->write_ptr);
 620         iwl_pcie_gen2_txq_inc_wr_ptr(trans, txq);
 621         /*
 622          * At this point the frame is "transmitted" successfully
 623          * and we will get a TX status notification eventually.
 624          */
 625         spin_unlock(&txq->lock);
 626         return 0;
 627 }
 628
 629 /*************** HOST COMMAND QUEUE FUNCTIONS   *****/
 630
 631 /*
 632  * iwl_pcie_gen2_enqueue_hcmd - enqueue a uCode command
 633  * @priv: device private data point
 634  * @cmd: a pointer to the ucode command structure
 635  *
 636  * The function returns < 0 values to indicate the operation
 637  * failed. On success, it returns the index (>= 0) of command in the
 638  * command queue.
 639  */
 640 static int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
 641                                       struct iwl_host_cmd *cmd)
 642 {
 643         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 644         struct iwl_txq *txq = trans_pcie->txq[trans_pcie->cmd_queue];
 645         struct iwl_device_cmd *out_cmd;
 646         struct iwl_cmd_meta *out_meta;
 647         unsigned long flags;
 648         void *dup_buf = NULL;
 649         dma_addr_t phys_addr;
 650         int i, cmd_pos, idx;
 651         u16 copy_size, cmd_size, tb0_size;
 652         bool had_nocopy = false;
 653         u8 group_id = iwl_cmd_groupid(cmd->id);
 654         const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
 655         u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
 656         struct iwl_tfh_tfd *tfd;
 657         unsigned long flags2;
 658
 659         copy_size = sizeof(struct iwl_cmd_header_wide);
 660         cmd_size = sizeof(struct iwl_cmd_header_wide);
 661
 662         for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
 663                 cmddata[i] = cmd->data[i];
 664                 cmdlen[i] = cmd->len[i];
 665
 666                 if (!cmd->len[i])
 667                         continue;
 668
 669                 /* need at least IWL_FIRST_TB_SIZE copied */
 670                 if (copy_size < IWL_FIRST_TB_SIZE) {
 671                         int copy = IWL_FIRST_TB_SIZE - copy_size;
 672
 673                         if (copy > cmdlen[i])
 674                                 copy = cmdlen[i];
 675                         cmdlen[i] -= copy;
 676                         cmddata[i] += copy;
 677                         copy_size += copy;
 678                 }
 679
 680                 if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) {
 681                         had_nocopy = true;
 682                         if (WARN_ON(cmd->dataflags[i] & IWL_HCMD_DFL_DUP)) {
 683                                 idx = -EINVAL;
 684                                 goto free_dup_buf;
 685                         }
 686                 } else if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP) {
 687                         /*
 688                          * This is also a chunk that isn't copied
 689                          * to the static buffer so set had_nocopy.
 690                          */
 691                         had_nocopy = true;
 692
 693                         /* only allowed once */
 694                         if (WARN_ON(dup_buf)) {
 695                                 idx = -EINVAL;
 696                                 goto free_dup_buf;
 697                         }
 698
 699                         dup_buf = kmemdup(cmddata[i], cmdlen[i],
 700                                           GFP_ATOMIC);
 701                         if (!dup_buf)
 702                                 return -ENOMEM;
 703                 } else {
 704                         /* NOCOPY must not be followed by normal! */
 705                         if (WARN_ON(had_nocopy)) {
 706                                 idx = -EINVAL;
 707                                 goto free_dup_buf;
 708                         }
 709                         copy_size += cmdlen[i];
 710                 }
 711                 cmd_size += cmd->len[i];
 712         }
 713
 714         /*
 715          * If any of the command structures end up being larger than the
 716          * TFD_MAX_PAYLOAD_SIZE and they aren't dynamically allocated into
 717          * separate TFDs, then we will need to increase the size of the buffers
 718          */
 719         if (WARN(copy_size > TFD_MAX_PAYLOAD_SIZE,
 720                  "Command %s (%#x) is too large (%d bytes)\n",
 721                  iwl_get_cmd_string(trans, cmd->id), cmd->id, copy_size)) {
 722                 idx = -EINVAL;
 723                 goto free_dup_buf;
 724         }
 725
 726         spin_lock_irqsave(&txq->lock, flags2);
 727
 728         idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr);
 729         tfd = iwl_pcie_get_tfd(trans, txq, txq->write_ptr);
 730         memset(tfd, 0, sizeof(*tfd));
 731
 732         if (iwl_queue_space(trans, txq) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
 733                 spin_unlock_irqrestore(&txq->lock, flags2);
 734
 735                 IWL_ERR(trans, "No space in command queue\n");
 736                 iwl_op_mode_cmd_queue_full(trans->op_mode);
 737                 idx = -ENOSPC;
 738                 goto free_dup_buf;
 739         }
 740
 741         out_cmd = txq->entries[idx].cmd;
 742         out_meta = &txq->entries[idx].meta;
 743
 744         /* re-initialize to NULL */
 745         memset(out_meta, 0, sizeof(*out_meta));
 746         if (cmd->flags & CMD_WANT_SKB)
 747                 out_meta->source = cmd;
 748
 749         /* set up the header */
 750         out_cmd->hdr_wide.cmd = iwl_cmd_opcode(cmd->id);
 751         out_cmd->hdr_wide.group_id = group_id;
 752         out_cmd->hdr_wide.version = iwl_cmd_version(cmd->id);
 753         out_cmd->hdr_wide.length =
 754                 cpu_to_le16(cmd_size - sizeof(struct iwl_cmd_header_wide));
 755         out_cmd->hdr_wide.reserved = 0;
 756         out_cmd->hdr_wide.sequence =
 757                 cpu_to_le16(QUEUE_TO_SEQ(trans_pcie->cmd_queue) |
 758                                          INDEX_TO_SEQ(txq->write_ptr));
 759
 760         cmd_pos = sizeof(struct iwl_cmd_header_wide);
 761         copy_size = sizeof(struct iwl_cmd_header_wide);
 762
 763         /* and copy the data that needs to be copied */
 764         for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
 765                 int copy;
 766
 767                 if (!cmd->len[i])
 768                         continue;
 769
 770                 /* copy everything if not nocopy/dup */
 771                 if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
 772                                            IWL_HCMD_DFL_DUP))) {
 773                         copy = cmd->len[i];
 774
 775                         memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
 776                         cmd_pos += copy;
 777                         copy_size += copy;
 778                         continue;
 779                 }
 780
 781                 /*
 782                  * Otherwise we need at least IWL_FIRST_TB_SIZE copied
 783                  * in total (for bi-directional DMA), but copy up to what
 784                  * we can fit into the payload for debug dump purposes.
 785                  */
 786                 copy = min_t(int, TFD_MAX_PAYLOAD_SIZE - cmd_pos, cmd->len[i]);
 787
 788                 memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
 789                 cmd_pos += copy;
 790
 791                 /* However, treat copy_size the proper way, we need it below */
 792                 if (copy_size < IWL_FIRST_TB_SIZE) {
 793                         copy = IWL_FIRST_TB_SIZE - copy_size;
 794
 795                         if (copy > cmd->len[i])
 796                                 copy = cmd->len[i];
 797                         copy_size += copy;
 798                 }
 799         }
 800
 801         IWL_DEBUG_HC(trans,
 802                      "Sending command %s (%.2x.%.2x), seq: 0x%04X, %d bytes at %d[%d]:%d\n",
 803                      iwl_get_cmd_string(trans, cmd->id), group_id,
 804                      out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence),
 805                      cmd_size, txq->write_ptr, idx, trans_pcie->cmd_queue);
 806
 807         /* start the TFD with the minimum copy bytes */
 808         tb0_size = min_t(int, copy_size, IWL_FIRST_TB_SIZE);
 809         memcpy(&txq->first_tb_bufs[idx], &out_cmd->hdr, tb0_size);
 810         iwl_pcie_gen2_set_tb(trans, tfd, iwl_pcie_get_first_tb_dma(txq, idx),
 811                              tb0_size);
 812
 813         /* map first command fragment, if any remains */
 814         if (copy_size > tb0_size) {
 815                 phys_addr = dma_map_single(trans->dev,
 816                                            ((u8 *)&out_cmd->hdr) + tb0_size,
 817                                            copy_size - tb0_size,
 818                                            DMA_TO_DEVICE);
 819                 if (dma_mapping_error(trans->dev, phys_addr)) {
 820                         idx = -ENOMEM;
 821                         iwl_pcie_gen2_tfd_unmap(trans, out_meta, tfd);
 822                         goto out;
 823                 }
 824                 iwl_pcie_gen2_set_tb(trans, tfd, phys_addr,
 825                                      copy_size - tb0_size);
 826         }
 827
 828         /* map the remaining (adjusted) nocopy/dup fragments */
 829         for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
 830                 const void *data = cmddata[i];
 831
 832                 if (!cmdlen[i])
 833                         continue;
 834                 if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
 835                                            IWL_HCMD_DFL_DUP)))
 836                         continue;
 837                 if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP)
 838                         data = dup_buf;
 839                 phys_addr = dma_map_single(trans->dev, (void *)data,
 840                                            cmdlen[i], DMA_TO_DEVICE);
 841                 if (dma_mapping_error(trans->dev, phys_addr)) {
 842                         idx = -ENOMEM;
 843                         iwl_pcie_gen2_tfd_unmap(trans, out_meta, tfd);
 844                         goto out;
 845                 }
 846                 iwl_pcie_gen2_set_tb(trans, tfd, phys_addr, cmdlen[i]);
 847         }
 848
 849         BUILD_BUG_ON(IWL_TFH_NUM_TBS > sizeof(out_meta->tbs) * BITS_PER_BYTE);
 850         out_meta->flags = cmd->flags;
 851         if (WARN_ON_ONCE(txq->entries[idx].free_buf))
 852                 kzfree(txq->entries[idx].free_buf);
 853         txq->entries[idx].free_buf = dup_buf;
 854
 855         trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size, &out_cmd->hdr_wide);
 856
 857         /* start timer if queue currently empty */
 858         if (txq->read_ptr == txq->write_ptr && txq->wd_timeout)
 859                 mod_timer(&txq->stuck_timer, jiffies + txq->wd_timeout);
 860
 861         spin_lock_irqsave(&trans_pcie->reg_lock, flags);
 862         if (!(cmd->flags & CMD_SEND_IN_IDLE) &&
 863             !trans_pcie->ref_cmd_in_flight) {
 864                 trans_pcie->ref_cmd_in_flight = true;
 865                 IWL_DEBUG_RPM(trans, "set ref_cmd_in_flight - ref\n");
 866                 iwl_trans_ref(trans);
 867         }
 868         /* Increment and update queue's write index */
 869         txq->write_ptr = iwl_queue_inc_wrap(trans, txq->write_ptr);
 870         iwl_pcie_gen2_txq_inc_wr_ptr(trans, txq);
 871         spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
 872
 873 out:
 874         spin_unlock_irqrestore(&txq->lock, flags2);
 875 free_dup_buf:
 876         if (idx < 0)
 877                 kfree(dup_buf);
 878         return idx;
 879 }
 880
 881 #define HOST_COMPLETE_TIMEOUT   (2 * HZ)
 882
 883 static int iwl_pcie_gen2_send_hcmd_sync(struct iwl_trans *trans,
 884                                         struct iwl_host_cmd *cmd)
 885 {
 886         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 887         const char *cmd_str = iwl_get_cmd_string(trans, cmd->id);
 888         struct iwl_txq *txq = trans_pcie->txq[trans_pcie->cmd_queue];
 889         int cmd_idx;
 890         int ret;
 891
 892         IWL_DEBUG_INFO(trans, "Attempting to send sync command %s\n", cmd_str);
 893
 894         if (WARN(test_and_set_bit(STATUS_SYNC_HCMD_ACTIVE,
 895                                   &trans->status),
 896                  "Command %s: a command is already active!\n", cmd_str))
 897                 return -EIO;
 898
 899         IWL_DEBUG_INFO(trans, "Setting HCMD_ACTIVE for command %s\n", cmd_str);
 900
 901         if (pm_runtime_suspended(&trans_pcie->pci_dev->dev)) {
 902                 ret = wait_event_timeout(trans_pcie->d0i3_waitq,
 903                                  pm_runtime_active(&trans_pcie->pci_dev->dev),
 904                                  msecs_to_jiffies(IWL_TRANS_IDLE_TIMEOUT));
 905                 if (!ret) {
 906                         IWL_ERR(trans, "Timeout exiting D0i3 before hcmd\n");
 907                         return -ETIMEDOUT;
 908                 }
 909         }
 910
 911         cmd_idx = iwl_pcie_gen2_enqueue_hcmd(trans, cmd);
 912         if (cmd_idx < 0) {
 913                 ret = cmd_idx;
 914                 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
 915                 IWL_ERR(trans, "Error sending %s: enqueue_hcmd failed: %d\n",
 916                         cmd_str, ret);
 917                 return ret;
 918         }
 919
 920         ret = wait_event_timeout(trans_pcie->wait_command_queue,
 921                                  !test_bit(STATUS_SYNC_HCMD_ACTIVE,
 922                                            &trans->status),
 923                                  HOST_COMPLETE_TIMEOUT);
 924         if (!ret) {
 925                 IWL_ERR(trans, "Error sending %s: time out after %dms.\n",
 926                         cmd_str, jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
 927
 928                 IWL_ERR(trans, "Current CMD queue read_ptr %d write_ptr %d\n",
 929                         txq->read_ptr, txq->write_ptr);
 930
 931                 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
 932                 IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n",
 933                                cmd_str);
 934                 ret = -ETIMEDOUT;
 935
 936                 iwl_force_nmi(trans);
 937                 iwl_trans_fw_error(trans);
 938
 939                 goto cancel;
 940         }
 941
 942         if (test_bit(STATUS_FW_ERROR, &trans->status)) {
 943                 IWL_ERR(trans, "FW error in SYNC CMD %s\n", cmd_str);
 944                 dump_stack();
 945                 ret = -EIO;
 946                 goto cancel;
 947         }
 948
 949         if (!(cmd->flags & CMD_SEND_IN_RFKILL) &&
 950             test_bit(STATUS_RFKILL_OPMODE, &trans->status)) {
 951                 IWL_DEBUG_RF_KILL(trans, "RFKILL in SYNC CMD... no rsp\n");
 952                 ret = -ERFKILL;
 953                 goto cancel;
 954         }
 955
 956         if ((cmd->flags & CMD_WANT_SKB) && !cmd->resp_pkt) {
 957                 IWL_ERR(trans, "Error: Response NULL in '%s'\n", cmd_str);
 958                 ret = -EIO;
 959                 goto cancel;
 960         }
 961
 962         return 0;
 963
 964 cancel:
 965         if (cmd->flags & CMD_WANT_SKB) {
 966                 /*
 967                  * Cancel the CMD_WANT_SKB flag for the cmd in the
 968                  * TX cmd queue. Otherwise in case the cmd comes
 969                  * in later, it will possibly set an invalid
 970                  * address (cmd->meta.source).
 971                  */
 972                 txq->entries[cmd_idx].meta.flags &= ~CMD_WANT_SKB;
 973         }
 974
 975         if (cmd->resp_pkt) {
 976                 iwl_free_resp(cmd);
 977                 cmd->resp_pkt = NULL;
 978         }
 979
 980         return ret;
 981 }
 982
 983 int iwl_trans_pcie_gen2_send_hcmd(struct iwl_trans *trans,
 984                                   struct iwl_host_cmd *cmd)
 985 {
 986         if (!(cmd->flags & CMD_SEND_IN_RFKILL) &&
 987             test_bit(STATUS_RFKILL_OPMODE, &trans->status)) {
 988                 IWL_DEBUG_RF_KILL(trans, "Dropping CMD 0x%x: RF KILL\n",
 989                                   cmd->id);
 990                 return -ERFKILL;
 991         }
 992
 993         if (cmd->flags & CMD_ASYNC) {
 994                 int ret;
 995
 996                 /* An asynchronous command can not expect an SKB to be set. */
 997                 if (WARN_ON(cmd->flags & CMD_WANT_SKB))
 998                         return -EINVAL;
 999
1000                 ret = iwl_pcie_gen2_enqueue_hcmd(trans, cmd);
1001                 if (ret < 0) {
1002                         IWL_ERR(trans,
1003                                 "Error sending %s: enqueue_hcmd failed: %d\n",
1004                                 iwl_get_cmd_string(trans, cmd->id), ret);
1005                         return ret;
1006                 }
1007                 return 0;
1008         }
1009
1010         return iwl_pcie_gen2_send_hcmd_sync(trans, cmd);
1011 }
1012
1013 /*
1014  * iwl_pcie_gen2_txq_unmap -  Unmap any remaining DMA mappings and free skb's
1015  */
1016 void iwl_pcie_gen2_txq_unmap(struct iwl_trans *trans, int txq_id)
1017 {
1018         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1019         struct iwl_txq *txq = trans_pcie->txq[txq_id];
1020
1021         spin_lock_bh(&txq->lock);
1022         while (txq->write_ptr != txq->read_ptr) {
1023                 IWL_DEBUG_TX_REPLY(trans, "Q %d Free %d\n",
1024                                    txq_id, txq->read_ptr);
1025
1026                 if (txq_id != trans_pcie->cmd_queue) {
1027                         int idx = iwl_pcie_get_cmd_index(txq, txq->read_ptr);
1028                         struct sk_buff *skb = txq->entries[idx].skb;
1029
1030                         if (WARN_ON_ONCE(!skb))
1031                                 continue;
1032
1033                         iwl_pcie_free_tso_page(trans_pcie, skb);
1034                 }
1035                 iwl_pcie_gen2_free_tfd(trans, txq);
1036                 txq->read_ptr = iwl_queue_inc_wrap(trans, txq->read_ptr);
1037
1038                 if (txq->read_ptr == txq->write_ptr) {
1039                         unsigned long flags;
1040
1041                         spin_lock_irqsave(&trans_pcie->reg_lock, flags);
1042                         if (txq_id != trans_pcie->cmd_queue) {
1043                                 IWL_DEBUG_RPM(trans, "Q %d - last tx freed\n",
1044                                               txq->id);
1045                                 iwl_trans_unref(trans);
1046                         } else if (trans_pcie->ref_cmd_in_flight) {
1047                                 trans_pcie->ref_cmd_in_flight = false;
1048                                 IWL_DEBUG_RPM(trans,
1049                                               "clear ref_cmd_in_flight\n");
1050                                 iwl_trans_unref(trans);
1051                         }
1052                         spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
1053                 }
1054         }
1055
1056         while (!skb_queue_empty(&txq->overflow_q)) {
1057                 struct sk_buff *skb = __skb_dequeue(&txq->overflow_q);
1058
1059                 iwl_op_mode_free_skb(trans->op_mode, skb);
1060         }
1061
1062         spin_unlock_bh(&txq->lock);
1063
1064         /* just in case - this queue may have been stopped */
1065         iwl_wake_queue(trans, txq);
1066 }
1067
1068 static void iwl_pcie_gen2_txq_free_memory(struct iwl_trans *trans,
1069                                           struct iwl_txq *txq)
1070 {
1071         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1072         struct device *dev = trans->dev;
1073
1074         /* De-alloc circular buffer of TFDs */
1075         if (txq->tfds) {
1076                 dma_free_coherent(dev,
1077                                   trans_pcie->tfd_size * txq->n_window,
1078                                   txq->tfds, txq->dma_addr);
1079                 dma_free_coherent(dev,
1080                                   sizeof(*txq->first_tb_bufs) * txq->n_window,
1081                                   txq->first_tb_bufs, txq->first_tb_dma);
1082         }
1083
1084         kfree(txq->entries);
1085         iwl_pcie_free_dma_ptr(trans, &txq->bc_tbl);
1086         kfree(txq);
1087 }
1088
1089 /*
1090  * iwl_pcie_txq_free - Deallocate DMA queue.
1091  * @txq: Transmit queue to deallocate.
1092  *
1093  * Empty queue by removing and destroying all BD's.
1094  * Free all buffers.
1095  * 0-fill, but do not free "txq" descriptor structure.
1096  */
1097 static void iwl_pcie_gen2_txq_free(struct iwl_trans *trans, int txq_id)
1098 {
1099         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1100         struct iwl_txq *txq = trans_pcie->txq[txq_id];
1101         int i;
1102
1103         if (WARN_ON(!txq))
1104                 return;
1105
1106         iwl_pcie_gen2_txq_unmap(trans, txq_id);
1107
1108         /* De-alloc array of command/tx buffers */
1109         if (txq_id == trans_pcie->cmd_queue)
1110                 for (i = 0; i < txq->n_window; i++) {
1111                         kzfree(txq->entries[i].cmd);
1112                         kzfree(txq->entries[i].free_buf);
1113                 }
1114         del_timer_sync(&txq->stuck_timer);
1115
1116         iwl_pcie_gen2_txq_free_memory(trans, txq);
1117
1118         trans_pcie->txq[txq_id] = NULL;
1119
1120         clear_bit(txq_id, trans_pcie->queue_used);
1121 }
1122
1123 int iwl_trans_pcie_dyn_txq_alloc(struct iwl_trans *trans,
1124                                  struct iwl_tx_queue_cfg_cmd *cmd,
1125                                  int cmd_id, int size,
1126                                  unsigned int timeout)
1127 {
1128         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1129         struct iwl_tx_queue_cfg_rsp *rsp;
1130         struct iwl_txq *txq;
1131         struct iwl_host_cmd hcmd = {
1132                 .id = cmd_id,
1133                 .len = { sizeof(*cmd) },
1134                 .data = { cmd, },
1135                 .flags = CMD_WANT_SKB,
1136         };
1137         int ret, qid;
1138         u32 wr_ptr;
1139
1140         txq = kzalloc(sizeof(*txq), GFP_KERNEL);
1141         if (!txq)
1142                 return -ENOMEM;
1143         ret = iwl_pcie_alloc_dma_ptr(trans, &txq->bc_tbl,
1144                                      (trans->cfg->device_family >=
1145                                       IWL_DEVICE_FAMILY_22560) ?
1146                                      sizeof(struct iwl_gen3_bc_tbl) :
1147                                      sizeof(struct iwlagn_scd_bc_tbl));
1148         if (ret) {
1149                 IWL_ERR(trans, "Scheduler BC Table allocation failed\n");
1150                 kfree(txq);
1151                 return -ENOMEM;
1152         }
1153
1154         ret = iwl_pcie_txq_alloc(trans, txq, size, false);
1155         if (ret) {
1156                 IWL_ERR(trans, "Tx queue alloc failed\n");
1157                 goto error;
1158         }
1159         ret = iwl_pcie_txq_init(trans, txq, size, false);
1160         if (ret) {
1161                 IWL_ERR(trans, "Tx queue init failed\n");
1162                 goto error;
1163         }
1164
1165         txq->wd_timeout = msecs_to_jiffies(timeout);
1166
1167         cmd->tfdq_addr = cpu_to_le64(txq->dma_addr);
1168         cmd->byte_cnt_addr = cpu_to_le64(txq->bc_tbl.dma);
1169         cmd->cb_size = cpu_to_le32(TFD_QUEUE_CB_SIZE(size));
1170
1171         ret = iwl_trans_send_cmd(trans, &hcmd);
1172         if (ret)
1173                 goto error;
1174
1175         if (WARN_ON(iwl_rx_packet_payload_len(hcmd.resp_pkt) != sizeof(*rsp))) {
1176                 ret = -EINVAL;
1177                 goto error_free_resp;
1178         }
1179
1180         rsp = (void *)hcmd.resp_pkt->data;
1181         qid = le16_to_cpu(rsp->queue_number);
1182         wr_ptr = le16_to_cpu(rsp->write_pointer);
1183
1184         if (qid >= ARRAY_SIZE(trans_pcie->txq)) {
1185                 WARN_ONCE(1, "queue index %d unsupported", qid);
1186                 ret = -EIO;
1187                 goto error_free_resp;
1188         }
1189
1190         if (test_and_set_bit(qid, trans_pcie->queue_used)) {
1191                 WARN_ONCE(1, "queue %d already used", qid);
1192                 ret = -EIO;
1193                 goto error_free_resp;
1194         }
1195
1196         txq->id = qid;
1197         trans_pcie->txq[qid] = txq;
1198         wr_ptr &= (trans->cfg->base_params->max_tfd_queue_size - 1);
1199
1200         /* Place first TFD at index corresponding to start sequence number */
1201         txq->read_ptr = wr_ptr;
1202         txq->write_ptr = wr_ptr;
1203         iwl_write_direct32(trans, HBUS_TARG_WRPTR,
1204                            (txq->write_ptr) | (qid << 16));
1205         IWL_DEBUG_TX_QUEUES(trans, "Activate queue %d\n", qid);
1206
1207         iwl_free_resp(&hcmd);
1208         return qid;
1209
1210 error_free_resp:
1211         iwl_free_resp(&hcmd);
1212 error:
1213         iwl_pcie_gen2_txq_free_memory(trans, txq);
1214         return ret;
1215 }
1216
1217 void iwl_trans_pcie_dyn_txq_free(struct iwl_trans *trans, int queue)
1218 {
1219         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1220
1221         /*
1222          * Upon HW Rfkill - we stop the device, and then stop the queues
1223          * in the op_mode. Just for the sake of the simplicity of the op_mode,
1224          * allow the op_mode to call txq_disable after it already called
1225          * stop_device.
1226          */
1227         if (!test_and_clear_bit(queue, trans_pcie->queue_used)) {
1228                 WARN_ONCE(test_bit(STATUS_DEVICE_ENABLED, &trans->status),
1229                           "queue %d not used", queue);
1230                 return;
1231         }
1232
1233         iwl_pcie_gen2_txq_unmap(trans, queue);
1234
1235         iwl_pcie_gen2_txq_free_memory(trans, trans_pcie->txq[queue]);
1236         trans_pcie->txq[queue] = NULL;
1237
1238         IWL_DEBUG_TX_QUEUES(trans, "Deactivate queue %d\n", queue);
1239 }
1240
1241 void iwl_pcie_gen2_tx_free(struct iwl_trans *trans)
1242 {
1243         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1244         int i;
1245
1246         memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used));
1247
1248         /* Free all TX queues */
1249         for (i = 0; i < ARRAY_SIZE(trans_pcie->txq); i++) {
1250                 if (!trans_pcie->txq[i])
1251                         continue;
1252
1253                 iwl_pcie_gen2_txq_free(trans, i);
1254         }
1255 }
1256
1257 int iwl_pcie_gen2_tx_init(struct iwl_trans *trans)
1258 {
1259         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1260         struct iwl_txq *cmd_queue;
1261         int txq_id = trans_pcie->cmd_queue, ret;
1262
1263         /* alloc and init the command queue */
1264         if (!trans_pcie->txq[txq_id]) {
1265                 cmd_queue = kzalloc(sizeof(*cmd_queue), GFP_KERNEL);
1266                 if (!cmd_queue) {
1267                         IWL_ERR(trans, "Not enough memory for command queue\n");
1268                         return -ENOMEM;
1269                 }
1270                 trans_pcie->txq[txq_id] = cmd_queue;
1271                 ret = iwl_pcie_txq_alloc(trans, cmd_queue, TFD_CMD_SLOTS, true);
1272                 if (ret) {
1273                         IWL_ERR(trans, "Tx %d queue init failed\n", txq_id);
1274                         goto error;
1275                 }
1276         } else {
1277                 cmd_queue = trans_pcie->txq[txq_id];
1278         }
1279
1280         ret = iwl_pcie_txq_init(trans, cmd_queue, TFD_CMD_SLOTS, true);
1281         if (ret) {
1282                 IWL_ERR(trans, "Tx %d queue alloc failed\n", txq_id);
1283                 goto error;
1284         }
1285         trans_pcie->txq[txq_id]->id = txq_id;
1286         set_bit(txq_id, trans_pcie->queue_used);
1287
1288         return 0;
1289
1290 error:
1291         iwl_pcie_gen2_tx_free(trans);
1292         return ret;
1293 }
1294