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

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
iwl_pcie_gen2_tx_stop
iwl_pcie_gen2_update_byte_tbl
iwl_pcie_gen2_txq_inc_wr_ptr
iwl_pcie_gen2_get_num_tbs
iwl_pcie_gen2_tfd_unmap
iwl_pcie_gen2_free_tfd
iwl_pcie_gen2_set_tb
iwl_pcie_gen2_build_amsdu
iwl_pcie_gen2_build_tx_amsdu
iwl_pcie_gen2_tx_add_frags
iwl_pcie_gen2_build_tx
iwl_pcie_gen2_build_tfd
iwl_trans_pcie_gen2_tx
iwl_pcie_gen2_enqueue_hcmd
iwl_pcie_gen2_send_hcmd_sync
iwl_trans_pcie_gen2_send_hcmd
iwl_pcie_gen2_txq_unmap
iwl_pcie_gen2_txq_free_memory
iwl_pcie_gen2_txq_free
iwl_trans_pcie_dyn_txq_alloc_dma
iwl_trans_pcie_txq_alloc_response
iwl_trans_pcie_dyn_txq_alloc
iwl_trans_pcie_dyn_txq_free
iwl_pcie_gen2_tx_free
iwl_pcie_gen2_tx_init
   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 - 2019 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 - 2019 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 <net/tso.h>
  54 #include <linux/tcp.h>
  55 
  56 #include "iwl-debug.h"
  57 #include "iwl-csr.h"
  58 #include "iwl-io.h"
  59 #include "internal.h"
  60 #include "fw/api/tx.h"
  61 
  62  /*
  63  * iwl_pcie_gen2_tx_stop - Stop all Tx DMA channels
  64  */
  65 void iwl_pcie_gen2_tx_stop(struct iwl_trans *trans)
  66 {
  67         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
  68         int txq_id;
  69 
  70         /*
  71          * This function can be called before the op_mode disabled the
  72          * queues. This happens when we have an rfkill interrupt.
  73          * Since we stop Tx altogether - mark the queues as stopped.
  74          */
  75         memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped));
  76         memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used));
  77 
  78         /* Unmap DMA from host system and free skb's */
  79         for (txq_id = 0; txq_id < ARRAY_SIZE(trans_pcie->txq); txq_id++) {
  80                 if (!trans_pcie->txq[txq_id])
  81                         continue;
  82                 iwl_pcie_gen2_txq_unmap(trans, txq_id);
  83         }
  84 }
  85 
  86 /*
  87  * iwl_pcie_txq_update_byte_tbl - Set up entry in Tx byte-count array
  88  */
  89 void iwl_pcie_gen2_update_byte_tbl(struct iwl_trans_pcie *trans_pcie,
  90                                    struct iwl_txq *txq, u16 byte_cnt,
  91                                    int num_tbs)
  92 {
  93         struct iwlagn_scd_bc_tbl *scd_bc_tbl = txq->bc_tbl.addr;
  94         struct iwl_trans *trans = iwl_trans_pcie_get_trans(trans_pcie);
  95         struct iwl_gen3_bc_tbl *scd_bc_tbl_gen3 = txq->bc_tbl.addr;
  96         int idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr);
  97         u8 filled_tfd_size, num_fetch_chunks;
  98         u16 len = byte_cnt;
  99         __le16 bc_ent;
 100 
 101         if (WARN(idx >= txq->n_window, "%d >= %d\n", idx, txq->n_window))
 102                 return;
 103 
 104         filled_tfd_size = offsetof(struct iwl_tfh_tfd, tbs) +
 105                                    num_tbs * sizeof(struct iwl_tfh_tb);
 106         /*
 107          * filled_tfd_size contains the number of filled bytes in the TFD.
 108          * Dividing it by 64 will give the number of chunks to fetch
 109          * to SRAM- 0 for one chunk, 1 for 2 and so on.
 110          * If, for example, TFD contains only 3 TBs then 32 bytes
 111          * of the TFD are used, and only one chunk of 64 bytes should
 112          * be fetched
 113          */
 114         num_fetch_chunks = DIV_ROUND_UP(filled_tfd_size, 64) - 1;
 115 
 116         if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_22560) {
 117                 /* Starting from 22560, the HW expects bytes */
 118                 WARN_ON(trans_pcie->bc_table_dword);
 119                 WARN_ON(len > 0x3FFF);
 120                 bc_ent = cpu_to_le16(len | (num_fetch_chunks << 14));
 121                 scd_bc_tbl_gen3->tfd_offset[idx] = bc_ent;
 122         } else {
 123                 /* Until 22560, the HW expects DW */
 124                 WARN_ON(!trans_pcie->bc_table_dword);
 125                 len = DIV_ROUND_UP(len, 4);
 126                 WARN_ON(len > 0xFFF);
 127                 bc_ent = cpu_to_le16(len | (num_fetch_chunks << 12));
 128                 scd_bc_tbl->tfd_offset[idx] = bc_ent;
 129         }
 130 }
 131 
 132 /*
 133  * iwl_pcie_gen2_txq_inc_wr_ptr - Send new write index to hardware
 134  */
 135 void iwl_pcie_gen2_txq_inc_wr_ptr(struct iwl_trans *trans,
 136                                   struct iwl_txq *txq)
 137 {
 138         lockdep_assert_held(&txq->lock);
 139 
 140         IWL_DEBUG_TX(trans, "Q:%d WR: 0x%x\n", txq->id, txq->write_ptr);
 141 
 142         /*
 143          * if not in power-save mode, uCode will never sleep when we're
 144          * trying to tx (during RFKILL, we're not trying to tx).
 145          */
 146         iwl_write32(trans, HBUS_TARG_WRPTR, txq->write_ptr | (txq->id << 16));
 147 }
 148 
 149 static u8 iwl_pcie_gen2_get_num_tbs(struct iwl_trans *trans,
 150                                     struct iwl_tfh_tfd *tfd)
 151 {
 152         return le16_to_cpu(tfd->num_tbs) & 0x1f;
 153 }
 154 
 155 static void iwl_pcie_gen2_tfd_unmap(struct iwl_trans *trans,
 156                                     struct iwl_cmd_meta *meta,
 157                                     struct iwl_tfh_tfd *tfd)
 158 {
 159         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 160         int i, num_tbs;
 161 
 162         /* Sanity check on number of chunks */
 163         num_tbs = iwl_pcie_gen2_get_num_tbs(trans, tfd);
 164 
 165         if (num_tbs > trans_pcie->max_tbs) {
 166                 IWL_ERR(trans, "Too many chunks: %i\n", num_tbs);
 167                 return;
 168         }
 169 
 170         /* first TB is never freed - it's the bidirectional DMA data */
 171         for (i = 1; i < num_tbs; i++) {
 172                 if (meta->tbs & BIT(i))
 173                         dma_unmap_page(trans->dev,
 174                                        le64_to_cpu(tfd->tbs[i].addr),
 175                                        le16_to_cpu(tfd->tbs[i].tb_len),
 176                                        DMA_TO_DEVICE);
 177                 else
 178                         dma_unmap_single(trans->dev,
 179                                          le64_to_cpu(tfd->tbs[i].addr),
 180                                          le16_to_cpu(tfd->tbs[i].tb_len),
 181                                          DMA_TO_DEVICE);
 182         }
 183 
 184         tfd->num_tbs = 0;
 185 }
 186 
 187 static void iwl_pcie_gen2_free_tfd(struct iwl_trans *trans, struct iwl_txq *txq)
 188 {
 189         /* rd_ptr is bounded by TFD_QUEUE_SIZE_MAX and
 190          * idx is bounded by n_window
 191          */
 192         int idx = iwl_pcie_get_cmd_index(txq, txq->read_ptr);
 193 
 194         lockdep_assert_held(&txq->lock);
 195 
 196         iwl_pcie_gen2_tfd_unmap(trans, &txq->entries[idx].meta,
 197                                 iwl_pcie_get_tfd(trans, txq, idx));
 198 
 199         /* free SKB */
 200         if (txq->entries) {
 201                 struct sk_buff *skb;
 202 
 203                 skb = txq->entries[idx].skb;
 204 
 205                 /* Can be called from irqs-disabled context
 206                  * If skb is not NULL, it means that the whole queue is being
 207                  * freed and that the queue is not empty - free the skb
 208                  */
 209                 if (skb) {
 210                         iwl_op_mode_free_skb(trans->op_mode, skb);
 211                         txq->entries[idx].skb = NULL;
 212                 }
 213         }
 214 }
 215 
 216 static int iwl_pcie_gen2_set_tb(struct iwl_trans *trans,
 217                                 struct iwl_tfh_tfd *tfd, dma_addr_t addr,
 218                                 u16 len)
 219 {
 220         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 221         int idx = iwl_pcie_gen2_get_num_tbs(trans, tfd);
 222         struct iwl_tfh_tb *tb;
 223 
 224         if (WARN_ON(idx >= IWL_TFH_NUM_TBS))
 225                 return -EINVAL;
 226         tb = &tfd->tbs[idx];
 227 
 228         /* Each TFD can point to a maximum max_tbs Tx buffers */
 229         if (le16_to_cpu(tfd->num_tbs) >= trans_pcie->max_tbs) {
 230                 IWL_ERR(trans, "Error can not send more than %d chunks\n",
 231                         trans_pcie->max_tbs);
 232                 return -EINVAL;
 233         }
 234 
 235         put_unaligned_le64(addr, &tb->addr);
 236         tb->tb_len = cpu_to_le16(len);
 237 
 238         tfd->num_tbs = cpu_to_le16(idx + 1);
 239 
 240         return idx;
 241 }
 242 
 243 static int iwl_pcie_gen2_build_amsdu(struct iwl_trans *trans,
 244                                      struct sk_buff *skb,
 245                                      struct iwl_tfh_tfd *tfd, int start_len,
 246                                      u8 hdr_len,
 247                                      struct iwl_device_tx_cmd *dev_cmd)
 248 {
 249 #ifdef CONFIG_INET
 250         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 251         struct iwl_tx_cmd_gen2 *tx_cmd = (void *)dev_cmd->payload;
 252         struct ieee80211_hdr *hdr = (void *)skb->data;
 253         unsigned int snap_ip_tcp_hdrlen, ip_hdrlen, total_len, hdr_room;
 254         unsigned int mss = skb_shinfo(skb)->gso_size;
 255         u16 length, amsdu_pad;
 256         u8 *start_hdr;
 257         struct iwl_tso_hdr_page *hdr_page;
 258         struct page **page_ptr;
 259         struct tso_t tso;
 260 
 261         trace_iwlwifi_dev_tx(trans->dev, skb, tfd, sizeof(*tfd),
 262                              &dev_cmd->hdr, start_len, 0);
 263 
 264         ip_hdrlen = skb_transport_header(skb) - skb_network_header(skb);
 265         snap_ip_tcp_hdrlen = 8 + ip_hdrlen + tcp_hdrlen(skb);
 266         total_len = skb->len - snap_ip_tcp_hdrlen - hdr_len;
 267         amsdu_pad = 0;
 268 
 269         /* total amount of header we may need for this A-MSDU */
 270         hdr_room = DIV_ROUND_UP(total_len, mss) *
 271                 (3 + snap_ip_tcp_hdrlen + sizeof(struct ethhdr));
 272 
 273         /* Our device supports 9 segments at most, it will fit in 1 page */
 274         hdr_page = get_page_hdr(trans, hdr_room);
 275         if (!hdr_page)
 276                 return -ENOMEM;
 277 
 278         get_page(hdr_page->page);
 279         start_hdr = hdr_page->pos;
 280         page_ptr = (void *)((u8 *)skb->cb + trans_pcie->page_offs);
 281         *page_ptr = hdr_page->page;
 282 
 283         /*
 284          * Pull the ieee80211 header to be able to use TSO core,
 285          * we will restore it for the tx_status flow.
 286          */
 287         skb_pull(skb, hdr_len);
 288 
 289         /*
 290          * Remove the length of all the headers that we don't actually
 291          * have in the MPDU by themselves, but that we duplicate into
 292          * all the different MSDUs inside the A-MSDU.
 293          */
 294         le16_add_cpu(&tx_cmd->len, -snap_ip_tcp_hdrlen);
 295 
 296         tso_start(skb, &tso);
 297 
 298         while (total_len) {
 299                 /* this is the data left for this subframe */
 300                 unsigned int data_left = min_t(unsigned int, mss, total_len);
 301                 struct sk_buff *csum_skb = NULL;
 302                 unsigned int tb_len;
 303                 dma_addr_t tb_phys;
 304                 u8 *subf_hdrs_start = hdr_page->pos;
 305 
 306                 total_len -= data_left;
 307 
 308                 memset(hdr_page->pos, 0, amsdu_pad);
 309                 hdr_page->pos += amsdu_pad;
 310                 amsdu_pad = (4 - (sizeof(struct ethhdr) + snap_ip_tcp_hdrlen +
 311                                   data_left)) & 0x3;
 312                 ether_addr_copy(hdr_page->pos, ieee80211_get_DA(hdr));
 313                 hdr_page->pos += ETH_ALEN;
 314                 ether_addr_copy(hdr_page->pos, ieee80211_get_SA(hdr));
 315                 hdr_page->pos += ETH_ALEN;
 316 
 317                 length = snap_ip_tcp_hdrlen + data_left;
 318                 *((__be16 *)hdr_page->pos) = cpu_to_be16(length);
 319                 hdr_page->pos += sizeof(length);
 320 
 321                 /*
 322                  * This will copy the SNAP as well which will be considered
 323                  * as MAC header.
 324                  */
 325                 tso_build_hdr(skb, hdr_page->pos, &tso, data_left, !total_len);
 326 
 327                 hdr_page->pos += snap_ip_tcp_hdrlen;
 328 
 329                 tb_len = hdr_page->pos - start_hdr;
 330                 tb_phys = dma_map_single(trans->dev, start_hdr,
 331                                          tb_len, DMA_TO_DEVICE);
 332                 if (unlikely(dma_mapping_error(trans->dev, tb_phys))) {
 333                         dev_kfree_skb(csum_skb);
 334                         goto out_err;
 335                 }
 336                 iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, tb_len);
 337                 trace_iwlwifi_dev_tx_tb(trans->dev, skb, start_hdr, tb_len);
 338                 /* add this subframe's headers' length to the tx_cmd */
 339                 le16_add_cpu(&tx_cmd->len, hdr_page->pos - subf_hdrs_start);
 340 
 341                 /* prepare the start_hdr for the next subframe */
 342                 start_hdr = hdr_page->pos;
 343 
 344                 /* put the payload */
 345                 while (data_left) {
 346                         tb_len = min_t(unsigned int, tso.size, data_left);
 347                         tb_phys = dma_map_single(trans->dev, tso.data,
 348                                                  tb_len, DMA_TO_DEVICE);
 349                         if (unlikely(dma_mapping_error(trans->dev, tb_phys))) {
 350                                 dev_kfree_skb(csum_skb);
 351                                 goto out_err;
 352                         }
 353                         iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, tb_len);
 354                         trace_iwlwifi_dev_tx_tb(trans->dev, skb, tso.data,
 355                                                 tb_len);
 356 
 357                         data_left -= tb_len;
 358                         tso_build_data(skb, &tso, tb_len);
 359                 }
 360         }
 361 
 362         /* re -add the WiFi header */
 363         skb_push(skb, hdr_len);
 364 
 365         return 0;
 366 
 367 out_err:
 368 #endif
 369         return -EINVAL;
 370 }
 371 
 372 static struct
 373 iwl_tfh_tfd *iwl_pcie_gen2_build_tx_amsdu(struct iwl_trans *trans,
 374                                           struct iwl_txq *txq,
 375                                           struct iwl_device_tx_cmd *dev_cmd,
 376                                           struct sk_buff *skb,
 377                                           struct iwl_cmd_meta *out_meta,
 378                                           int hdr_len,
 379                                           int tx_cmd_len)
 380 {
 381         int idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr);
 382         struct iwl_tfh_tfd *tfd = iwl_pcie_get_tfd(trans, txq, idx);
 383         dma_addr_t tb_phys;
 384         int len;
 385         void *tb1_addr;
 386 
 387         tb_phys = iwl_pcie_get_first_tb_dma(txq, idx);
 388 
 389         iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, IWL_FIRST_TB_SIZE);
 390 
 391         /*
 392          * The second TB (tb1) points to the remainder of the TX command
 393          * and the 802.11 header - dword aligned size
 394          * (This calculation modifies the TX command, so do it before the
 395          * setup of the first TB)
 396          */
 397         len = tx_cmd_len + sizeof(struct iwl_cmd_header) + hdr_len -
 398               IWL_FIRST_TB_SIZE;
 399 
 400         /* do not align A-MSDU to dword as the subframe header aligns it */
 401 
 402         /* map the data for TB1 */
 403         tb1_addr = ((u8 *)&dev_cmd->hdr) + IWL_FIRST_TB_SIZE;
 404         tb_phys = dma_map_single(trans->dev, tb1_addr, len, DMA_TO_DEVICE);
 405         if (unlikely(dma_mapping_error(trans->dev, tb_phys)))
 406                 goto out_err;
 407         /*
 408          * No need for _with_wa(), we ensure (via alignment) that the data
 409          * here can never cross or end at a page boundary.
 410          */
 411         iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, len);
 412 
 413         if (iwl_pcie_gen2_build_amsdu(trans, skb, tfd,
 414                                       len + IWL_FIRST_TB_SIZE,
 415                                       hdr_len, dev_cmd))
 416                 goto out_err;
 417 
 418         /* building the A-MSDU might have changed this data, memcpy it now */
 419         memcpy(&txq->first_tb_bufs[idx], dev_cmd, IWL_FIRST_TB_SIZE);
 420         return tfd;
 421 
 422 out_err:
 423         iwl_pcie_gen2_tfd_unmap(trans, out_meta, tfd);
 424         return NULL;
 425 }
 426 
 427 static int iwl_pcie_gen2_tx_add_frags(struct iwl_trans *trans,
 428                                       struct sk_buff *skb,
 429                                       struct iwl_tfh_tfd *tfd,
 430                                       struct iwl_cmd_meta *out_meta)
 431 {
 432         int i;
 433 
 434         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 435                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 436                 dma_addr_t tb_phys;
 437                 int tb_idx;
 438 
 439                 if (!skb_frag_size(frag))
 440                         continue;
 441 
 442                 tb_phys = skb_frag_dma_map(trans->dev, frag, 0,
 443                                            skb_frag_size(frag), DMA_TO_DEVICE);
 444 
 445                 if (unlikely(dma_mapping_error(trans->dev, tb_phys)))
 446                         return -ENOMEM;
 447                 tb_idx = iwl_pcie_gen2_set_tb(trans, tfd, tb_phys,
 448                                               skb_frag_size(frag));
 449                 trace_iwlwifi_dev_tx_tb(trans->dev, skb,
 450                                         skb_frag_address(frag),
 451                                         skb_frag_size(frag));
 452                 if (tb_idx < 0)
 453                         return tb_idx;
 454 
 455                 out_meta->tbs |= BIT(tb_idx);
 456         }
 457 
 458         return 0;
 459 }
 460 
 461 static struct
 462 iwl_tfh_tfd *iwl_pcie_gen2_build_tx(struct iwl_trans *trans,
 463                                     struct iwl_txq *txq,
 464                                     struct iwl_device_tx_cmd *dev_cmd,
 465                                     struct sk_buff *skb,
 466                                     struct iwl_cmd_meta *out_meta,
 467                                     int hdr_len,
 468                                     int tx_cmd_len,
 469                                     bool pad)
 470 {
 471         int idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr);
 472         struct iwl_tfh_tfd *tfd = iwl_pcie_get_tfd(trans, txq, idx);
 473         dma_addr_t tb_phys;
 474         int len, tb1_len, tb2_len;
 475         void *tb1_addr;
 476         struct sk_buff *frag;
 477 
 478         tb_phys = iwl_pcie_get_first_tb_dma(txq, idx);
 479 
 480         /* The first TB points to bi-directional DMA data */
 481         memcpy(&txq->first_tb_bufs[idx], dev_cmd, IWL_FIRST_TB_SIZE);
 482 
 483         iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, IWL_FIRST_TB_SIZE);
 484 
 485         /*
 486          * The second TB (tb1) points to the remainder of the TX command
 487          * and the 802.11 header - dword aligned size
 488          * (This calculation modifies the TX command, so do it before the
 489          * setup of the first TB)
 490          */
 491         len = tx_cmd_len + sizeof(struct iwl_cmd_header) + hdr_len -
 492               IWL_FIRST_TB_SIZE;
 493 
 494         if (pad)
 495                 tb1_len = ALIGN(len, 4);
 496         else
 497                 tb1_len = len;
 498 
 499         /* map the data for TB1 */
 500         tb1_addr = ((u8 *)&dev_cmd->hdr) + IWL_FIRST_TB_SIZE;
 501         tb_phys = dma_map_single(trans->dev, tb1_addr, tb1_len, DMA_TO_DEVICE);
 502         if (unlikely(dma_mapping_error(trans->dev, tb_phys)))
 503                 goto out_err;
 504         /*
 505          * No need for _with_wa(), we ensure (via alignment) that the data
 506          * here can never cross or end at a page boundary.
 507          */
 508         iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, tb1_len);
 509         trace_iwlwifi_dev_tx(trans->dev, skb, tfd, sizeof(*tfd), &dev_cmd->hdr,
 510                              IWL_FIRST_TB_SIZE + tb1_len, hdr_len);
 511 
 512         /* set up TFD's third entry to point to remainder of skb's head */
 513         tb2_len = skb_headlen(skb) - hdr_len;
 514 
 515         if (tb2_len > 0) {
 516                 tb_phys = dma_map_single(trans->dev, skb->data + hdr_len,
 517                                          tb2_len, DMA_TO_DEVICE);
 518                 if (unlikely(dma_mapping_error(trans->dev, tb_phys)))
 519                         goto out_err;
 520                 iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, tb2_len);
 521                 trace_iwlwifi_dev_tx_tb(trans->dev, skb,
 522                                         skb->data + hdr_len,
 523                                         tb2_len);
 524         }
 525 
 526         if (iwl_pcie_gen2_tx_add_frags(trans, skb, tfd, out_meta))
 527                 goto out_err;
 528 
 529         skb_walk_frags(skb, frag) {
 530                 tb_phys = dma_map_single(trans->dev, frag->data,
 531                                          skb_headlen(frag), DMA_TO_DEVICE);
 532                 if (unlikely(dma_mapping_error(trans->dev, tb_phys)))
 533                         goto out_err;
 534                 iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, skb_headlen(frag));
 535                 trace_iwlwifi_dev_tx_tb(trans->dev, skb,
 536                                         frag->data,
 537                                         skb_headlen(frag));
 538                 if (iwl_pcie_gen2_tx_add_frags(trans, frag, tfd, out_meta))
 539                         goto out_err;
 540         }
 541 
 542         return tfd;
 543 
 544 out_err:
 545         iwl_pcie_gen2_tfd_unmap(trans, out_meta, tfd);
 546         return NULL;
 547 }
 548 
 549 static
 550 struct iwl_tfh_tfd *iwl_pcie_gen2_build_tfd(struct iwl_trans *trans,
 551                                             struct iwl_txq *txq,
 552                                             struct iwl_device_tx_cmd *dev_cmd,
 553                                             struct sk_buff *skb,
 554                                             struct iwl_cmd_meta *out_meta)
 555 {
 556         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 557         int idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr);
 558         struct iwl_tfh_tfd *tfd = iwl_pcie_get_tfd(trans, txq, idx);
 559         int len, hdr_len;
 560         bool amsdu;
 561 
 562         /* There must be data left over for TB1 or this code must be changed */
 563         BUILD_BUG_ON(sizeof(struct iwl_tx_cmd_gen2) < IWL_FIRST_TB_SIZE);
 564 
 565         memset(tfd, 0, sizeof(*tfd));
 566 
 567         if (trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_22560)
 568                 len = sizeof(struct iwl_tx_cmd_gen2);
 569         else
 570                 len = sizeof(struct iwl_tx_cmd_gen3);
 571 
 572         amsdu = ieee80211_is_data_qos(hdr->frame_control) &&
 573                         (*ieee80211_get_qos_ctl(hdr) &
 574                          IEEE80211_QOS_CTL_A_MSDU_PRESENT);
 575 
 576         hdr_len = ieee80211_hdrlen(hdr->frame_control);
 577 
 578         /*
 579          * Only build A-MSDUs here if doing so by GSO, otherwise it may be
 580          * an A-MSDU for other reasons, e.g. NAN or an A-MSDU having been
 581          * built in the higher layers already.
 582          */
 583         if (amsdu && skb_shinfo(skb)->gso_size)
 584                 return iwl_pcie_gen2_build_tx_amsdu(trans, txq, dev_cmd, skb,
 585                                                     out_meta, hdr_len, len);
 586 
 587         return iwl_pcie_gen2_build_tx(trans, txq, dev_cmd, skb, out_meta,
 588                                       hdr_len, len, !amsdu);
 589 }
 590 
 591 int iwl_trans_pcie_gen2_tx(struct iwl_trans *trans, struct sk_buff *skb,
 592                            struct iwl_device_tx_cmd *dev_cmd, int txq_id)
 593 {
 594         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 595         struct iwl_cmd_meta *out_meta;
 596         struct iwl_txq *txq = trans_pcie->txq[txq_id];
 597         u16 cmd_len;
 598         int idx;
 599         void *tfd;
 600 
 601         if (WARN_ONCE(!test_bit(txq_id, trans_pcie->queue_used),
 602                       "TX on unused queue %d\n", txq_id))
 603                 return -EINVAL;
 604 
 605         if (skb_is_nonlinear(skb) &&
 606             skb_shinfo(skb)->nr_frags > IWL_PCIE_MAX_FRAGS(trans_pcie) &&
 607             __skb_linearize(skb))
 608                 return -ENOMEM;
 609 
 610         spin_lock(&txq->lock);
 611 
 612         if (iwl_queue_space(trans, txq) < txq->high_mark) {
 613                 iwl_stop_queue(trans, txq);
 614 
 615                 /* don't put the packet on the ring, if there is no room */
 616                 if (unlikely(iwl_queue_space(trans, txq) < 3)) {
 617                         struct iwl_device_tx_cmd **dev_cmd_ptr;
 618 
 619                         dev_cmd_ptr = (void *)((u8 *)skb->cb +
 620                                                trans_pcie->dev_cmd_offs);
 621 
 622                         *dev_cmd_ptr = dev_cmd;
 623                         __skb_queue_tail(&txq->overflow_q, skb);
 624                         spin_unlock(&txq->lock);
 625                         return 0;
 626                 }
 627         }
 628 
 629         idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr);
 630 
 631         /* Set up driver data for this TFD */
 632         txq->entries[idx].skb = skb;
 633         txq->entries[idx].cmd = dev_cmd;
 634 
 635         dev_cmd->hdr.sequence =
 636                 cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
 637                             INDEX_TO_SEQ(idx)));
 638 
 639         /* Set up first empty entry in queue's array of Tx/cmd buffers */
 640         out_meta = &txq->entries[idx].meta;
 641         out_meta->flags = 0;
 642 
 643         tfd = iwl_pcie_gen2_build_tfd(trans, txq, dev_cmd, skb, out_meta);
 644         if (!tfd) {
 645                 spin_unlock(&txq->lock);
 646                 return -1;
 647         }
 648 
 649         if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_22560) {
 650                 struct iwl_tx_cmd_gen3 *tx_cmd_gen3 =
 651                         (void *)dev_cmd->payload;
 652 
 653                 cmd_len = le16_to_cpu(tx_cmd_gen3->len);
 654         } else {
 655                 struct iwl_tx_cmd_gen2 *tx_cmd_gen2 =
 656                         (void *)dev_cmd->payload;
 657 
 658                 cmd_len = le16_to_cpu(tx_cmd_gen2->len);
 659         }
 660 
 661         /* Set up entry for this TFD in Tx byte-count array */
 662         iwl_pcie_gen2_update_byte_tbl(trans_pcie, txq, cmd_len,
 663                                       iwl_pcie_gen2_get_num_tbs(trans, tfd));
 664 
 665         /* start timer if queue currently empty */
 666         if (txq->read_ptr == txq->write_ptr && txq->wd_timeout)
 667                 mod_timer(&txq->stuck_timer, jiffies + txq->wd_timeout);
 668 
 669         /* Tell device the write index *just past* this latest filled TFD */
 670         txq->write_ptr = iwl_queue_inc_wrap(trans, txq->write_ptr);
 671         iwl_pcie_gen2_txq_inc_wr_ptr(trans, txq);
 672         /*
 673          * At this point the frame is "transmitted" successfully
 674          * and we will get a TX status notification eventually.
 675          */
 676         spin_unlock(&txq->lock);
 677         return 0;
 678 }
 679 
 680 /*************** HOST COMMAND QUEUE FUNCTIONS   *****/
 681 
 682 /*
 683  * iwl_pcie_gen2_enqueue_hcmd - enqueue a uCode command
 684  * @priv: device private data point
 685  * @cmd: a pointer to the ucode command structure
 686  *
 687  * The function returns < 0 values to indicate the operation
 688  * failed. On success, it returns the index (>= 0) of command in the
 689  * command queue.
 690  */
 691 static int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
 692                                       struct iwl_host_cmd *cmd)
 693 {
 694         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 695         struct iwl_txq *txq = trans_pcie->txq[trans_pcie->cmd_queue];
 696         struct iwl_device_cmd *out_cmd;
 697         struct iwl_cmd_meta *out_meta;
 698         unsigned long flags;
 699         void *dup_buf = NULL;
 700         dma_addr_t phys_addr;
 701         int i, cmd_pos, idx;
 702         u16 copy_size, cmd_size, tb0_size;
 703         bool had_nocopy = false;
 704         u8 group_id = iwl_cmd_groupid(cmd->id);
 705         const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
 706         u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
 707         struct iwl_tfh_tfd *tfd;
 708 
 709         copy_size = sizeof(struct iwl_cmd_header_wide);
 710         cmd_size = sizeof(struct iwl_cmd_header_wide);
 711 
 712         for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
 713                 cmddata[i] = cmd->data[i];
 714                 cmdlen[i] = cmd->len[i];
 715 
 716                 if (!cmd->len[i])
 717                         continue;
 718 
 719                 /* need at least IWL_FIRST_TB_SIZE copied */
 720                 if (copy_size < IWL_FIRST_TB_SIZE) {
 721                         int copy = IWL_FIRST_TB_SIZE - copy_size;
 722 
 723                         if (copy > cmdlen[i])
 724                                 copy = cmdlen[i];
 725                         cmdlen[i] -= copy;
 726                         cmddata[i] += copy;
 727                         copy_size += copy;
 728                 }
 729 
 730                 if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) {
 731                         had_nocopy = true;
 732                         if (WARN_ON(cmd->dataflags[i] & IWL_HCMD_DFL_DUP)) {
 733                                 idx = -EINVAL;
 734                                 goto free_dup_buf;
 735                         }
 736                 } else if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP) {
 737                         /*
 738                          * This is also a chunk that isn't copied
 739                          * to the static buffer so set had_nocopy.
 740                          */
 741                         had_nocopy = true;
 742 
 743                         /* only allowed once */
 744                         if (WARN_ON(dup_buf)) {
 745                                 idx = -EINVAL;
 746                                 goto free_dup_buf;
 747                         }
 748 
 749                         dup_buf = kmemdup(cmddata[i], cmdlen[i],
 750                                           GFP_ATOMIC);
 751                         if (!dup_buf)
 752                                 return -ENOMEM;
 753                 } else {
 754                         /* NOCOPY must not be followed by normal! */
 755                         if (WARN_ON(had_nocopy)) {
 756                                 idx = -EINVAL;
 757                                 goto free_dup_buf;
 758                         }
 759                         copy_size += cmdlen[i];
 760                 }
 761                 cmd_size += cmd->len[i];
 762         }
 763 
 764         /*
 765          * If any of the command structures end up being larger than the
 766          * TFD_MAX_PAYLOAD_SIZE and they aren't dynamically allocated into
 767          * separate TFDs, then we will need to increase the size of the buffers
 768          */
 769         if (WARN(copy_size > TFD_MAX_PAYLOAD_SIZE,
 770                  "Command %s (%#x) is too large (%d bytes)\n",
 771                  iwl_get_cmd_string(trans, cmd->id), cmd->id, copy_size)) {
 772                 idx = -EINVAL;
 773                 goto free_dup_buf;
 774         }
 775 
 776         spin_lock_bh(&txq->lock);
 777 
 778         idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr);
 779         tfd = iwl_pcie_get_tfd(trans, txq, txq->write_ptr);
 780         memset(tfd, 0, sizeof(*tfd));
 781 
 782         if (iwl_queue_space(trans, txq) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
 783                 spin_unlock_bh(&txq->lock);
 784 
 785                 IWL_ERR(trans, "No space in command queue\n");
 786                 iwl_op_mode_cmd_queue_full(trans->op_mode);
 787                 idx = -ENOSPC;
 788                 goto free_dup_buf;
 789         }
 790 
 791         out_cmd = txq->entries[idx].cmd;
 792         out_meta = &txq->entries[idx].meta;
 793 
 794         /* re-initialize to NULL */
 795         memset(out_meta, 0, sizeof(*out_meta));
 796         if (cmd->flags & CMD_WANT_SKB)
 797                 out_meta->source = cmd;
 798 
 799         /* set up the header */
 800         out_cmd->hdr_wide.cmd = iwl_cmd_opcode(cmd->id);
 801         out_cmd->hdr_wide.group_id = group_id;
 802         out_cmd->hdr_wide.version = iwl_cmd_version(cmd->id);
 803         out_cmd->hdr_wide.length =
 804                 cpu_to_le16(cmd_size - sizeof(struct iwl_cmd_header_wide));
 805         out_cmd->hdr_wide.reserved = 0;
 806         out_cmd->hdr_wide.sequence =
 807                 cpu_to_le16(QUEUE_TO_SEQ(trans_pcie->cmd_queue) |
 808                                          INDEX_TO_SEQ(txq->write_ptr));
 809 
 810         cmd_pos = sizeof(struct iwl_cmd_header_wide);
 811         copy_size = sizeof(struct iwl_cmd_header_wide);
 812 
 813         /* and copy the data that needs to be copied */
 814         for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
 815                 int copy;
 816 
 817                 if (!cmd->len[i])
 818                         continue;
 819 
 820                 /* copy everything if not nocopy/dup */
 821                 if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
 822                                            IWL_HCMD_DFL_DUP))) {
 823                         copy = cmd->len[i];
 824 
 825                         memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
 826                         cmd_pos += copy;
 827                         copy_size += copy;
 828                         continue;
 829                 }
 830 
 831                 /*
 832                  * Otherwise we need at least IWL_FIRST_TB_SIZE copied
 833                  * in total (for bi-directional DMA), but copy up to what
 834                  * we can fit into the payload for debug dump purposes.
 835                  */
 836                 copy = min_t(int, TFD_MAX_PAYLOAD_SIZE - cmd_pos, cmd->len[i]);
 837 
 838                 memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
 839                 cmd_pos += copy;
 840 
 841                 /* However, treat copy_size the proper way, we need it below */
 842                 if (copy_size < IWL_FIRST_TB_SIZE) {
 843                         copy = IWL_FIRST_TB_SIZE - copy_size;
 844 
 845                         if (copy > cmd->len[i])
 846                                 copy = cmd->len[i];
 847                         copy_size += copy;
 848                 }
 849         }
 850 
 851         IWL_DEBUG_HC(trans,
 852                      "Sending command %s (%.2x.%.2x), seq: 0x%04X, %d bytes at %d[%d]:%d\n",
 853                      iwl_get_cmd_string(trans, cmd->id), group_id,
 854                      out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence),
 855                      cmd_size, txq->write_ptr, idx, trans_pcie->cmd_queue);
 856 
 857         /* start the TFD with the minimum copy bytes */
 858         tb0_size = min_t(int, copy_size, IWL_FIRST_TB_SIZE);
 859         memcpy(&txq->first_tb_bufs[idx], out_cmd, tb0_size);
 860         iwl_pcie_gen2_set_tb(trans, tfd, iwl_pcie_get_first_tb_dma(txq, idx),
 861                              tb0_size);
 862 
 863         /* map first command fragment, if any remains */
 864         if (copy_size > tb0_size) {
 865                 phys_addr = dma_map_single(trans->dev,
 866                                            (u8 *)out_cmd + tb0_size,
 867                                            copy_size - tb0_size,
 868                                            DMA_TO_DEVICE);
 869                 if (dma_mapping_error(trans->dev, phys_addr)) {
 870                         idx = -ENOMEM;
 871                         iwl_pcie_gen2_tfd_unmap(trans, out_meta, tfd);
 872                         goto out;
 873                 }
 874                 iwl_pcie_gen2_set_tb(trans, tfd, phys_addr,
 875                                      copy_size - tb0_size);
 876         }
 877 
 878         /* map the remaining (adjusted) nocopy/dup fragments */
 879         for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
 880                 const void *data = cmddata[i];
 881 
 882                 if (!cmdlen[i])
 883                         continue;
 884                 if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
 885                                            IWL_HCMD_DFL_DUP)))
 886                         continue;
 887                 if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP)
 888                         data = dup_buf;
 889                 phys_addr = dma_map_single(trans->dev, (void *)data,
 890                                            cmdlen[i], DMA_TO_DEVICE);
 891                 if (dma_mapping_error(trans->dev, phys_addr)) {
 892                         idx = -ENOMEM;
 893                         iwl_pcie_gen2_tfd_unmap(trans, out_meta, tfd);
 894                         goto out;
 895                 }
 896                 iwl_pcie_gen2_set_tb(trans, tfd, phys_addr, cmdlen[i]);
 897         }
 898 
 899         BUILD_BUG_ON(IWL_TFH_NUM_TBS > sizeof(out_meta->tbs) * BITS_PER_BYTE);
 900         out_meta->flags = cmd->flags;
 901         if (WARN_ON_ONCE(txq->entries[idx].free_buf))
 902                 kzfree(txq->entries[idx].free_buf);
 903         txq->entries[idx].free_buf = dup_buf;
 904 
 905         trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size, &out_cmd->hdr_wide);
 906 
 907         /* start timer if queue currently empty */
 908         if (txq->read_ptr == txq->write_ptr && txq->wd_timeout)
 909                 mod_timer(&txq->stuck_timer, jiffies + txq->wd_timeout);
 910 
 911         spin_lock_irqsave(&trans_pcie->reg_lock, flags);
 912         /* Increment and update queue's write index */
 913         txq->write_ptr = iwl_queue_inc_wrap(trans, txq->write_ptr);
 914         iwl_pcie_gen2_txq_inc_wr_ptr(trans, txq);
 915         spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
 916 
 917 out:
 918         spin_unlock_bh(&txq->lock);
 919 free_dup_buf:
 920         if (idx < 0)
 921                 kfree(dup_buf);
 922         return idx;
 923 }
 924 
 925 #define HOST_COMPLETE_TIMEOUT   (2 * HZ)
 926 
 927 static int iwl_pcie_gen2_send_hcmd_sync(struct iwl_trans *trans,
 928                                         struct iwl_host_cmd *cmd)
 929 {
 930         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 931         const char *cmd_str = iwl_get_cmd_string(trans, cmd->id);
 932         struct iwl_txq *txq = trans_pcie->txq[trans_pcie->cmd_queue];
 933         int cmd_idx;
 934         int ret;
 935 
 936         IWL_DEBUG_INFO(trans, "Attempting to send sync command %s\n", cmd_str);
 937 
 938         if (WARN(test_and_set_bit(STATUS_SYNC_HCMD_ACTIVE,
 939                                   &trans->status),
 940                  "Command %s: a command is already active!\n", cmd_str))
 941                 return -EIO;
 942 
 943         IWL_DEBUG_INFO(trans, "Setting HCMD_ACTIVE for command %s\n", cmd_str);
 944 
 945         cmd_idx = iwl_pcie_gen2_enqueue_hcmd(trans, cmd);
 946         if (cmd_idx < 0) {
 947                 ret = cmd_idx;
 948                 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
 949                 IWL_ERR(trans, "Error sending %s: enqueue_hcmd failed: %d\n",
 950                         cmd_str, ret);
 951                 return ret;
 952         }
 953 
 954         ret = wait_event_timeout(trans_pcie->wait_command_queue,
 955                                  !test_bit(STATUS_SYNC_HCMD_ACTIVE,
 956                                            &trans->status),
 957                                  HOST_COMPLETE_TIMEOUT);
 958         if (!ret) {
 959                 IWL_ERR(trans, "Error sending %s: time out after %dms.\n",
 960                         cmd_str, jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
 961 
 962                 IWL_ERR(trans, "Current CMD queue read_ptr %d write_ptr %d\n",
 963                         txq->read_ptr, txq->write_ptr);
 964 
 965                 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
 966                 IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n",
 967                                cmd_str);
 968                 ret = -ETIMEDOUT;
 969 
 970                 iwl_trans_pcie_sync_nmi(trans);
 971                 goto cancel;
 972         }
 973 
 974         if (test_bit(STATUS_FW_ERROR, &trans->status)) {
 975                 IWL_ERR(trans, "FW error in SYNC CMD %s\n", cmd_str);
 976                 dump_stack();
 977                 ret = -EIO;
 978                 goto cancel;
 979         }
 980 
 981         if (!(cmd->flags & CMD_SEND_IN_RFKILL) &&
 982             test_bit(STATUS_RFKILL_OPMODE, &trans->status)) {
 983                 IWL_DEBUG_RF_KILL(trans, "RFKILL in SYNC CMD... no rsp\n");
 984                 ret = -ERFKILL;
 985                 goto cancel;
 986         }
 987 
 988         if ((cmd->flags & CMD_WANT_SKB) && !cmd->resp_pkt) {
 989                 IWL_ERR(trans, "Error: Response NULL in '%s'\n", cmd_str);
 990                 ret = -EIO;
 991                 goto cancel;
 992         }
 993 
 994         return 0;
 995 
 996 cancel:
 997         if (cmd->flags & CMD_WANT_SKB) {
 998                 /*
 999                  * Cancel the CMD_WANT_SKB flag for the cmd in the
1000                  * TX cmd queue. Otherwise in case the cmd comes
1001                  * in later, it will possibly set an invalid
1002                  * address (cmd->meta.source).
1003                  */
1004                 txq->entries[cmd_idx].meta.flags &= ~CMD_WANT_SKB;
1005         }
1006 
1007         if (cmd->resp_pkt) {
1008                 iwl_free_resp(cmd);
1009                 cmd->resp_pkt = NULL;
1010         }
1011 
1012         return ret;
1013 }
1014 
1015 int iwl_trans_pcie_gen2_send_hcmd(struct iwl_trans *trans,
1016                                   struct iwl_host_cmd *cmd)
1017 {
1018         if (!(cmd->flags & CMD_SEND_IN_RFKILL) &&
1019             test_bit(STATUS_RFKILL_OPMODE, &trans->status)) {
1020                 IWL_DEBUG_RF_KILL(trans, "Dropping CMD 0x%x: RF KILL\n",
1021                                   cmd->id);
1022                 return -ERFKILL;
1023         }
1024 
1025         if (cmd->flags & CMD_ASYNC) {
1026                 int ret;
1027 
1028                 /* An asynchronous command can not expect an SKB to be set. */
1029                 if (WARN_ON(cmd->flags & CMD_WANT_SKB))
1030                         return -EINVAL;
1031 
1032                 ret = iwl_pcie_gen2_enqueue_hcmd(trans, cmd);
1033                 if (ret < 0) {
1034                         IWL_ERR(trans,
1035                                 "Error sending %s: enqueue_hcmd failed: %d\n",
1036                                 iwl_get_cmd_string(trans, cmd->id), ret);
1037                         return ret;
1038                 }
1039                 return 0;
1040         }
1041 
1042         return iwl_pcie_gen2_send_hcmd_sync(trans, cmd);
1043 }
1044 
1045 /*
1046  * iwl_pcie_gen2_txq_unmap -  Unmap any remaining DMA mappings and free skb's
1047  */
1048 void iwl_pcie_gen2_txq_unmap(struct iwl_trans *trans, int txq_id)
1049 {
1050         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1051         struct iwl_txq *txq = trans_pcie->txq[txq_id];
1052 
1053         spin_lock_bh(&txq->lock);
1054         while (txq->write_ptr != txq->read_ptr) {
1055                 IWL_DEBUG_TX_REPLY(trans, "Q %d Free %d\n",
1056                                    txq_id, txq->read_ptr);
1057 
1058                 if (txq_id != trans_pcie->cmd_queue) {
1059                         int idx = iwl_pcie_get_cmd_index(txq, txq->read_ptr);
1060                         struct sk_buff *skb = txq->entries[idx].skb;
1061 
1062                         if (WARN_ON_ONCE(!skb))
1063                                 continue;
1064 
1065                         iwl_pcie_free_tso_page(trans_pcie, skb);
1066                 }
1067                 iwl_pcie_gen2_free_tfd(trans, txq);
1068                 txq->read_ptr = iwl_queue_inc_wrap(trans, txq->read_ptr);
1069         }
1070 
1071         while (!skb_queue_empty(&txq->overflow_q)) {
1072                 struct sk_buff *skb = __skb_dequeue(&txq->overflow_q);
1073 
1074                 iwl_op_mode_free_skb(trans->op_mode, skb);
1075         }
1076 
1077         spin_unlock_bh(&txq->lock);
1078 
1079         /* just in case - this queue may have been stopped */
1080         iwl_wake_queue(trans, txq);
1081 }
1082 
1083 void iwl_pcie_gen2_txq_free_memory(struct iwl_trans *trans,
1084                                    struct iwl_txq *txq)
1085 {
1086         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1087         struct device *dev = trans->dev;
1088 
1089         /* De-alloc circular buffer of TFDs */
1090         if (txq->tfds) {
1091                 dma_free_coherent(dev,
1092                                   trans_pcie->tfd_size * txq->n_window,
1093                                   txq->tfds, txq->dma_addr);
1094                 dma_free_coherent(dev,
1095                                   sizeof(*txq->first_tb_bufs) * txq->n_window,
1096                                   txq->first_tb_bufs, txq->first_tb_dma);
1097         }
1098 
1099         kfree(txq->entries);
1100         iwl_pcie_free_dma_ptr(trans, &txq->bc_tbl);
1101         kfree(txq);
1102 }
1103 
1104 /*
1105  * iwl_pcie_txq_free - Deallocate DMA queue.
1106  * @txq: Transmit queue to deallocate.
1107  *
1108  * Empty queue by removing and destroying all BD's.
1109  * Free all buffers.
1110  * 0-fill, but do not free "txq" descriptor structure.
1111  */
1112 static void iwl_pcie_gen2_txq_free(struct iwl_trans *trans, int txq_id)
1113 {
1114         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1115         struct iwl_txq *txq = trans_pcie->txq[txq_id];
1116         int i;
1117 
1118         if (WARN_ON(!txq))
1119                 return;
1120 
1121         iwl_pcie_gen2_txq_unmap(trans, txq_id);
1122 
1123         /* De-alloc array of command/tx buffers */
1124         if (txq_id == trans_pcie->cmd_queue)
1125                 for (i = 0; i < txq->n_window; i++) {
1126                         kzfree(txq->entries[i].cmd);
1127                         kzfree(txq->entries[i].free_buf);
1128                 }
1129         del_timer_sync(&txq->stuck_timer);
1130 
1131         iwl_pcie_gen2_txq_free_memory(trans, txq);
1132 
1133         trans_pcie->txq[txq_id] = NULL;
1134 
1135         clear_bit(txq_id, trans_pcie->queue_used);
1136 }
1137 
1138 int iwl_trans_pcie_dyn_txq_alloc_dma(struct iwl_trans *trans,
1139                                      struct iwl_txq **intxq, int size,
1140                                      unsigned int timeout)
1141 {
1142         int ret;
1143 
1144         struct iwl_txq *txq;
1145         txq = kzalloc(sizeof(*txq), GFP_KERNEL);
1146         if (!txq)
1147                 return -ENOMEM;
1148         ret = iwl_pcie_alloc_dma_ptr(trans, &txq->bc_tbl,
1149                                      (trans->trans_cfg->device_family >=
1150                                       IWL_DEVICE_FAMILY_22560) ?
1151                                      sizeof(struct iwl_gen3_bc_tbl) :
1152                                      sizeof(struct iwlagn_scd_bc_tbl));
1153         if (ret) {
1154                 IWL_ERR(trans, "Scheduler BC Table allocation failed\n");
1155                 kfree(txq);
1156                 return -ENOMEM;
1157         }
1158 
1159         ret = iwl_pcie_txq_alloc(trans, txq, size, false);
1160         if (ret) {
1161                 IWL_ERR(trans, "Tx queue alloc failed\n");
1162                 goto error;
1163         }
1164         ret = iwl_pcie_txq_init(trans, txq, size, false);
1165         if (ret) {
1166                 IWL_ERR(trans, "Tx queue init failed\n");
1167                 goto error;
1168         }
1169 
1170         txq->wd_timeout = msecs_to_jiffies(timeout);
1171 
1172         *intxq = txq;
1173         return 0;
1174 
1175 error:
1176         iwl_pcie_gen2_txq_free_memory(trans, txq);
1177         return ret;
1178 }
1179 
1180 int iwl_trans_pcie_txq_alloc_response(struct iwl_trans *trans,
1181                                       struct iwl_txq *txq,
1182                                       struct iwl_host_cmd *hcmd)
1183 {
1184         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1185         struct iwl_tx_queue_cfg_rsp *rsp;
1186         int ret, qid;
1187         u32 wr_ptr;
1188 
1189         if (WARN_ON(iwl_rx_packet_payload_len(hcmd->resp_pkt) !=
1190                     sizeof(*rsp))) {
1191                 ret = -EINVAL;
1192                 goto error_free_resp;
1193         }
1194 
1195         rsp = (void *)hcmd->resp_pkt->data;
1196         qid = le16_to_cpu(rsp->queue_number);
1197         wr_ptr = le16_to_cpu(rsp->write_pointer);
1198 
1199         if (qid >= ARRAY_SIZE(trans_pcie->txq)) {
1200                 WARN_ONCE(1, "queue index %d unsupported", qid);
1201                 ret = -EIO;
1202                 goto error_free_resp;
1203         }
1204 
1205         if (test_and_set_bit(qid, trans_pcie->queue_used)) {
1206                 WARN_ONCE(1, "queue %d already used", qid);
1207                 ret = -EIO;
1208                 goto error_free_resp;
1209         }
1210 
1211         txq->id = qid;
1212         trans_pcie->txq[qid] = txq;
1213         wr_ptr &= (trans->trans_cfg->base_params->max_tfd_queue_size - 1);
1214 
1215         /* Place first TFD at index corresponding to start sequence number */
1216         txq->read_ptr = wr_ptr;
1217         txq->write_ptr = wr_ptr;
1218 
1219         IWL_DEBUG_TX_QUEUES(trans, "Activate queue %d\n", qid);
1220 
1221         iwl_free_resp(hcmd);
1222         return qid;
1223 
1224 error_free_resp:
1225         iwl_free_resp(hcmd);
1226         iwl_pcie_gen2_txq_free_memory(trans, txq);
1227         return ret;
1228 }
1229 
1230 int iwl_trans_pcie_dyn_txq_alloc(struct iwl_trans *trans,
1231                                  __le16 flags, u8 sta_id, u8 tid,
1232                                  int cmd_id, int size,
1233                                  unsigned int timeout)
1234 {
1235         struct iwl_txq *txq = NULL;
1236         struct iwl_tx_queue_cfg_cmd cmd = {
1237                 .flags = flags,
1238                 .sta_id = sta_id,
1239                 .tid = tid,
1240         };
1241         struct iwl_host_cmd hcmd = {
1242                 .id = cmd_id,
1243                 .len = { sizeof(cmd) },
1244                 .data = { &cmd, },
1245                 .flags = CMD_WANT_SKB,
1246         };
1247         int ret;
1248 
1249         ret = iwl_trans_pcie_dyn_txq_alloc_dma(trans, &txq, size, timeout);
1250         if (ret)
1251                 return ret;
1252 
1253         cmd.tfdq_addr = cpu_to_le64(txq->dma_addr);
1254         cmd.byte_cnt_addr = cpu_to_le64(txq->bc_tbl.dma);
1255         cmd.cb_size = cpu_to_le32(TFD_QUEUE_CB_SIZE(size));
1256 
1257         ret = iwl_trans_send_cmd(trans, &hcmd);
1258         if (ret)
1259                 goto error;
1260 
1261         return iwl_trans_pcie_txq_alloc_response(trans, txq, &hcmd);
1262 
1263 error:
1264         iwl_pcie_gen2_txq_free_memory(trans, txq);
1265         return ret;
1266 }
1267 
1268 void iwl_trans_pcie_dyn_txq_free(struct iwl_trans *trans, int queue)
1269 {
1270         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1271 
1272         /*
1273          * Upon HW Rfkill - we stop the device, and then stop the queues
1274          * in the op_mode. Just for the sake of the simplicity of the op_mode,
1275          * allow the op_mode to call txq_disable after it already called
1276          * stop_device.
1277          */
1278         if (!test_and_clear_bit(queue, trans_pcie->queue_used)) {
1279                 WARN_ONCE(test_bit(STATUS_DEVICE_ENABLED, &trans->status),
1280                           "queue %d not used", queue);
1281                 return;
1282         }
1283 
1284         iwl_pcie_gen2_txq_unmap(trans, queue);
1285 
1286         iwl_pcie_gen2_txq_free_memory(trans, trans_pcie->txq[queue]);
1287         trans_pcie->txq[queue] = NULL;
1288 
1289         IWL_DEBUG_TX_QUEUES(trans, "Deactivate queue %d\n", queue);
1290 }
1291 
1292 void iwl_pcie_gen2_tx_free(struct iwl_trans *trans)
1293 {
1294         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1295         int i;
1296 
1297         memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used));
1298 
1299         /* Free all TX queues */
1300         for (i = 0; i < ARRAY_SIZE(trans_pcie->txq); i++) {
1301                 if (!trans_pcie->txq[i])
1302                         continue;
1303 
1304                 iwl_pcie_gen2_txq_free(trans, i);
1305         }
1306 }
1307 
1308 int iwl_pcie_gen2_tx_init(struct iwl_trans *trans, int txq_id, int queue_size)
1309 {
1310         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1311         struct iwl_txq *queue;
1312         int ret;
1313 
1314         /* alloc and init the tx queue */
1315         if (!trans_pcie->txq[txq_id]) {
1316                 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
1317                 if (!queue) {
1318                         IWL_ERR(trans, "Not enough memory for tx queue\n");
1319                         return -ENOMEM;
1320                 }
1321                 trans_pcie->txq[txq_id] = queue;
1322                 ret = iwl_pcie_txq_alloc(trans, queue, queue_size, true);
1323                 if (ret) {
1324                         IWL_ERR(trans, "Tx %d queue init failed\n", txq_id);
1325                         goto error;
1326                 }
1327         } else {
1328                 queue = trans_pcie->txq[txq_id];
1329         }
1330 
1331         ret = iwl_pcie_txq_init(trans, queue, queue_size,
1332                                 (txq_id == trans_pcie->cmd_queue));
1333         if (ret) {
1334                 IWL_ERR(trans, "Tx %d queue alloc failed\n", txq_id);
1335                 goto error;
1336         }
1337         trans_pcie->txq[txq_id]->id = txq_id;
1338         set_bit(txq_id, trans_pcie->queue_used);
1339 
1340         return 0;
1341 
1342 error:
1343         iwl_pcie_gen2_tx_free(trans);
1344         return ret;
1345 }
1346
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c

DEFINITIONS
