1 /******************************************************************************
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.
8 * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
10 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
11 * Copyright(c) 2018 - 2019 Intel Corporation
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of version 2 of the GNU General Public License as
15 * published by the Free Software Foundation.
17 * This program is distributed in the hope that it will be useful, but WITHOUT
18 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
22 * The full GNU General Public License is included in this distribution in the
23 * file called COPYING.
25 * Contact Information:
26 * Intel Linux Wireless <linuxwifi@intel.com>
27 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
31 * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
32 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
33 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
34 * Copyright(c) 2018 - 2019 Intel Corporation
35 * All rights reserved.
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
41 * * Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * * Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in
45 * the documentation and/or other materials provided with the
47 * * Neither the name Intel Corporation nor the names of its
48 * contributors may be used to endorse or promote products derived
49 * from this software without specific prior written permission.
51 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
52 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
53 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
54 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
55 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
56 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
57 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
58 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
59 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
60 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
61 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
63 *****************************************************************************/
64 #include <linux/etherdevice.h>
65 #include <linux/ieee80211.h>
66 #include <linux/slab.h>
67 #include <linux/sched.h>
68 #include <linux/pm_runtime.h>
69 #include <net/ip6_checksum.h>
72 #include "iwl-debug.h"
77 #include "iwl-op-mode.h"
79 #include "fw/api/tx.h"
81 #define IWL_TX_CRC_SIZE 4
82 #define IWL_TX_DELIMITER_SIZE 4
84 /*************** DMA-QUEUE-GENERAL-FUNCTIONS *****
89 * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer
90 * of buffer descriptors, each of which points to one or more data buffers for
91 * the device to read from or fill. Driver and device exchange status of each
92 * queue via "read" and "write" pointers. Driver keeps minimum of 2 empty
93 * entries in each circular buffer, to protect against confusing empty and full
96 * The device reads or writes the data in the queues via the device's several
97 * DMA/FIFO channels. Each queue is mapped to a single DMA channel.
99 * For Tx queue, there are low mark and high mark limits. If, after queuing
100 * the packet for Tx, free space become < low mark, Tx queue stopped. When
101 * reclaiming packets (on 'tx done IRQ), if free space become > high mark,
104 ***************************************************/
106 int iwl_queue_space(struct iwl_trans *trans, const struct iwl_txq *q)
112 * To avoid ambiguity between empty and completely full queues, there
113 * should always be less than max_tfd_queue_size elements in the queue.
114 * If q->n_window is smaller than max_tfd_queue_size, there is no need
115 * to reserve any queue entries for this purpose.
117 if (q->n_window < trans->cfg->base_params->max_tfd_queue_size)
120 max = trans->cfg->base_params->max_tfd_queue_size - 1;
123 * max_tfd_queue_size is a power of 2, so the following is equivalent to
124 * modulo by max_tfd_queue_size and is well defined.
126 used = (q->write_ptr - q->read_ptr) &
127 (trans->cfg->base_params->max_tfd_queue_size - 1);
129 if (WARN_ON(used > max))
136 * iwl_queue_init - Initialize queue's high/low-water and read/write indexes
138 static int iwl_queue_init(struct iwl_txq *q, int slots_num)
140 q->n_window = slots_num;
142 /* slots_num must be power-of-two size, otherwise
143 * iwl_pcie_get_cmd_index is broken. */
144 if (WARN_ON(!is_power_of_2(slots_num)))
147 q->low_mark = q->n_window / 4;
151 q->high_mark = q->n_window / 8;
152 if (q->high_mark < 2)
161 int iwl_pcie_alloc_dma_ptr(struct iwl_trans *trans,
162 struct iwl_dma_ptr *ptr, size_t size)
164 if (WARN_ON(ptr->addr))
167 ptr->addr = dma_alloc_coherent(trans->dev, size,
168 &ptr->dma, GFP_KERNEL);
175 void iwl_pcie_free_dma_ptr(struct iwl_trans *trans, struct iwl_dma_ptr *ptr)
177 if (unlikely(!ptr->addr))
180 dma_free_coherent(trans->dev, ptr->size, ptr->addr, ptr->dma);
181 memset(ptr, 0, sizeof(*ptr));
184 static void iwl_pcie_txq_stuck_timer(struct timer_list *t)
186 struct iwl_txq *txq = from_timer(txq, t, stuck_timer);
187 struct iwl_trans_pcie *trans_pcie = txq->trans_pcie;
188 struct iwl_trans *trans = iwl_trans_pcie_get_trans(trans_pcie);
190 spin_lock(&txq->lock);
191 /* check if triggered erroneously */
192 if (txq->read_ptr == txq->write_ptr) {
193 spin_unlock(&txq->lock);
196 spin_unlock(&txq->lock);
198 iwl_trans_pcie_log_scd_error(trans, txq);
200 iwl_force_nmi(trans);
204 * iwl_pcie_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array
206 static void iwl_pcie_txq_update_byte_cnt_tbl(struct iwl_trans *trans,
207 struct iwl_txq *txq, u16 byte_cnt,
210 struct iwlagn_scd_bc_tbl *scd_bc_tbl;
211 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
212 int write_ptr = txq->write_ptr;
213 int txq_id = txq->id;
215 u16 len = byte_cnt + IWL_TX_CRC_SIZE + IWL_TX_DELIMITER_SIZE;
217 struct iwl_tx_cmd *tx_cmd =
218 (void *)txq->entries[txq->write_ptr].cmd->payload;
219 u8 sta_id = tx_cmd->sta_id;
221 scd_bc_tbl = trans_pcie->scd_bc_tbls.addr;
223 sec_ctl = tx_cmd->sec_ctl;
225 switch (sec_ctl & TX_CMD_SEC_MSK) {
227 len += IEEE80211_CCMP_MIC_LEN;
229 case TX_CMD_SEC_TKIP:
230 len += IEEE80211_TKIP_ICV_LEN;
233 len += IEEE80211_WEP_IV_LEN + IEEE80211_WEP_ICV_LEN;
236 if (trans_pcie->bc_table_dword)
237 len = DIV_ROUND_UP(len, 4);
239 if (WARN_ON(len > 0xFFF || write_ptr >= TFD_QUEUE_SIZE_MAX))
242 bc_ent = cpu_to_le16(len | (sta_id << 12));
244 scd_bc_tbl[txq_id].tfd_offset[write_ptr] = bc_ent;
246 if (write_ptr < TFD_QUEUE_SIZE_BC_DUP)
248 tfd_offset[TFD_QUEUE_SIZE_MAX + write_ptr] = bc_ent;
251 static void iwl_pcie_txq_inval_byte_cnt_tbl(struct iwl_trans *trans,
254 struct iwl_trans_pcie *trans_pcie =
255 IWL_TRANS_GET_PCIE_TRANS(trans);
256 struct iwlagn_scd_bc_tbl *scd_bc_tbl = trans_pcie->scd_bc_tbls.addr;
257 int txq_id = txq->id;
258 int read_ptr = txq->read_ptr;
261 struct iwl_tx_cmd *tx_cmd =
262 (void *)txq->entries[read_ptr].cmd->payload;
264 WARN_ON(read_ptr >= TFD_QUEUE_SIZE_MAX);
266 if (txq_id != trans_pcie->cmd_queue)
267 sta_id = tx_cmd->sta_id;
269 bc_ent = cpu_to_le16(1 | (sta_id << 12));
271 scd_bc_tbl[txq_id].tfd_offset[read_ptr] = bc_ent;
273 if (read_ptr < TFD_QUEUE_SIZE_BC_DUP)
275 tfd_offset[TFD_QUEUE_SIZE_MAX + read_ptr] = bc_ent;
279 * iwl_pcie_txq_inc_wr_ptr - Send new write index to hardware
281 static void iwl_pcie_txq_inc_wr_ptr(struct iwl_trans *trans,
284 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
286 int txq_id = txq->id;
288 lockdep_assert_held(&txq->lock);
291 * explicitly wake up the NIC if:
292 * 1. shadow registers aren't enabled
293 * 2. NIC is woken up for CMD regardless of shadow outside this function
294 * 3. there is a chance that the NIC is asleep
296 if (!trans->cfg->base_params->shadow_reg_enable &&
297 txq_id != trans_pcie->cmd_queue &&
298 test_bit(STATUS_TPOWER_PMI, &trans->status)) {
300 * wake up nic if it's powered down ...
301 * uCode will wake up, and interrupt us again, so next
302 * time we'll skip this part.
304 reg = iwl_read32(trans, CSR_UCODE_DRV_GP1);
306 if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
307 IWL_DEBUG_INFO(trans, "Tx queue %d requesting wakeup, GP1 = 0x%x\n",
309 iwl_set_bit(trans, CSR_GP_CNTRL,
310 BIT(trans->cfg->csr->flag_mac_access_req));
311 txq->need_update = true;
317 * if not in power-save mode, uCode will never sleep when we're
318 * trying to tx (during RFKILL, we're not trying to tx).
320 IWL_DEBUG_TX(trans, "Q:%d WR: 0x%x\n", txq_id, txq->write_ptr);
322 iwl_write32(trans, HBUS_TARG_WRPTR,
323 txq->write_ptr | (txq_id << 8));
326 void iwl_pcie_txq_check_wrptrs(struct iwl_trans *trans)
328 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
331 for (i = 0; i < trans->cfg->base_params->num_of_queues; i++) {
332 struct iwl_txq *txq = trans_pcie->txq[i];
334 if (!test_bit(i, trans_pcie->queue_used))
337 spin_lock_bh(&txq->lock);
338 if (txq->need_update) {
339 iwl_pcie_txq_inc_wr_ptr(trans, txq);
340 txq->need_update = false;
342 spin_unlock_bh(&txq->lock);
346 static inline dma_addr_t iwl_pcie_tfd_tb_get_addr(struct iwl_trans *trans,
350 if (trans->cfg->use_tfh) {
351 struct iwl_tfh_tfd *tfd = _tfd;
352 struct iwl_tfh_tb *tb = &tfd->tbs[idx];
354 return (dma_addr_t)(le64_to_cpu(tb->addr));
356 struct iwl_tfd *tfd = _tfd;
357 struct iwl_tfd_tb *tb = &tfd->tbs[idx];
358 dma_addr_t addr = get_unaligned_le32(&tb->lo);
361 if (sizeof(dma_addr_t) <= sizeof(u32))
364 hi_len = le16_to_cpu(tb->hi_n_len) & 0xF;
367 * shift by 16 twice to avoid warnings on 32-bit
368 * (where this code never runs anyway due to the
369 * if statement above)
371 return addr | ((hi_len << 16) << 16);
375 static inline void iwl_pcie_tfd_set_tb(struct iwl_trans *trans, void *tfd,
376 u8 idx, dma_addr_t addr, u16 len)
378 struct iwl_tfd *tfd_fh = (void *)tfd;
379 struct iwl_tfd_tb *tb = &tfd_fh->tbs[idx];
381 u16 hi_n_len = len << 4;
383 put_unaligned_le32(addr, &tb->lo);
384 hi_n_len |= iwl_get_dma_hi_addr(addr);
386 tb->hi_n_len = cpu_to_le16(hi_n_len);
388 tfd_fh->num_tbs = idx + 1;
391 static inline u8 iwl_pcie_tfd_get_num_tbs(struct iwl_trans *trans, void *_tfd)
393 if (trans->cfg->use_tfh) {
394 struct iwl_tfh_tfd *tfd = _tfd;
396 return le16_to_cpu(tfd->num_tbs) & 0x1f;
398 struct iwl_tfd *tfd = _tfd;
400 return tfd->num_tbs & 0x1f;
404 static void iwl_pcie_tfd_unmap(struct iwl_trans *trans,
405 struct iwl_cmd_meta *meta,
406 struct iwl_txq *txq, int index)
408 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
410 void *tfd = iwl_pcie_get_tfd(trans, txq, index);
412 /* Sanity check on number of chunks */
413 num_tbs = iwl_pcie_tfd_get_num_tbs(trans, tfd);
415 if (num_tbs > trans_pcie->max_tbs) {
416 IWL_ERR(trans, "Too many chunks: %i\n", num_tbs);
417 /* @todo issue fatal error, it is quite serious situation */
421 /* first TB is never freed - it's the bidirectional DMA data */
423 for (i = 1; i < num_tbs; i++) {
424 if (meta->tbs & BIT(i))
425 dma_unmap_page(trans->dev,
426 iwl_pcie_tfd_tb_get_addr(trans, tfd, i),
427 iwl_pcie_tfd_tb_get_len(trans, tfd, i),
430 dma_unmap_single(trans->dev,
431 iwl_pcie_tfd_tb_get_addr(trans, tfd,
433 iwl_pcie_tfd_tb_get_len(trans, tfd,
438 if (trans->cfg->use_tfh) {
439 struct iwl_tfh_tfd *tfd_fh = (void *)tfd;
443 struct iwl_tfd *tfd_fh = (void *)tfd;
451 * iwl_pcie_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr]
452 * @trans - transport private data
454 * @dma_dir - the direction of the DMA mapping
456 * Does NOT advance any TFD circular buffer read/write indexes
457 * Does NOT free the TFD itself (which is within circular buffer)
459 void iwl_pcie_txq_free_tfd(struct iwl_trans *trans, struct iwl_txq *txq)
461 /* rd_ptr is bounded by TFD_QUEUE_SIZE_MAX and
462 * idx is bounded by n_window
464 int rd_ptr = txq->read_ptr;
465 int idx = iwl_pcie_get_cmd_index(txq, rd_ptr);
467 lockdep_assert_held(&txq->lock);
469 /* We have only q->n_window txq->entries, but we use
470 * TFD_QUEUE_SIZE_MAX tfds
472 iwl_pcie_tfd_unmap(trans, &txq->entries[idx].meta, txq, rd_ptr);
478 skb = txq->entries[idx].skb;
480 /* Can be called from irqs-disabled context
481 * If skb is not NULL, it means that the whole queue is being
482 * freed and that the queue is not empty - free the skb
485 iwl_op_mode_free_skb(trans->op_mode, skb);
486 txq->entries[idx].skb = NULL;
491 static int iwl_pcie_txq_build_tfd(struct iwl_trans *trans, struct iwl_txq *txq,
492 dma_addr_t addr, u16 len, bool reset)
494 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
498 tfd = txq->tfds + trans_pcie->tfd_size * txq->write_ptr;
501 memset(tfd, 0, trans_pcie->tfd_size);
503 num_tbs = iwl_pcie_tfd_get_num_tbs(trans, tfd);
505 /* Each TFD can point to a maximum max_tbs Tx buffers */
506 if (num_tbs >= trans_pcie->max_tbs) {
507 IWL_ERR(trans, "Error can not send more than %d chunks\n",
508 trans_pcie->max_tbs);
512 if (WARN(addr & ~IWL_TX_DMA_MASK,
513 "Unaligned address = %llx\n", (unsigned long long)addr))
516 iwl_pcie_tfd_set_tb(trans, tfd, num_tbs, addr, len);
521 int iwl_pcie_txq_alloc(struct iwl_trans *trans, struct iwl_txq *txq,
522 int slots_num, bool cmd_queue)
524 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
525 size_t tfd_sz = trans_pcie->tfd_size *
526 trans->cfg->base_params->max_tfd_queue_size;
530 if (WARN_ON(txq->entries || txq->tfds))
533 if (trans->cfg->use_tfh)
534 tfd_sz = trans_pcie->tfd_size * slots_num;
536 timer_setup(&txq->stuck_timer, iwl_pcie_txq_stuck_timer, 0);
537 txq->trans_pcie = trans_pcie;
539 txq->n_window = slots_num;
541 txq->entries = kcalloc(slots_num,
542 sizeof(struct iwl_pcie_txq_entry),
549 for (i = 0; i < slots_num; i++) {
550 txq->entries[i].cmd =
551 kmalloc(sizeof(struct iwl_device_cmd),
553 if (!txq->entries[i].cmd)
557 /* Circular buffer of transmit frame descriptors (TFDs),
558 * shared with device */
559 txq->tfds = dma_alloc_coherent(trans->dev, tfd_sz,
560 &txq->dma_addr, GFP_KERNEL);
564 BUILD_BUG_ON(IWL_FIRST_TB_SIZE_ALIGN != sizeof(*txq->first_tb_bufs));
566 tb0_buf_sz = sizeof(*txq->first_tb_bufs) * slots_num;
568 txq->first_tb_bufs = dma_alloc_coherent(trans->dev, tb0_buf_sz,
571 if (!txq->first_tb_bufs)
576 dma_free_coherent(trans->dev, tfd_sz, txq->tfds, txq->dma_addr);
578 if (txq->entries && cmd_queue)
579 for (i = 0; i < slots_num; i++)
580 kfree(txq->entries[i].cmd);
588 int iwl_pcie_txq_init(struct iwl_trans *trans, struct iwl_txq *txq,
589 int slots_num, bool cmd_queue)
592 u32 tfd_queue_max_size = trans->cfg->base_params->max_tfd_queue_size;
594 txq->need_update = false;
596 /* max_tfd_queue_size must be power-of-two size, otherwise
597 * iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */
598 if (WARN_ONCE(tfd_queue_max_size & (tfd_queue_max_size - 1),
599 "Max tfd queue size must be a power of two, but is %d",
603 /* Initialize queue's high/low-water marks, and head/tail indexes */
604 ret = iwl_queue_init(txq, slots_num);
608 spin_lock_init(&txq->lock);
611 static struct lock_class_key iwl_pcie_cmd_queue_lock_class;
613 lockdep_set_class(&txq->lock, &iwl_pcie_cmd_queue_lock_class);
616 __skb_queue_head_init(&txq->overflow_q);
621 void iwl_pcie_free_tso_page(struct iwl_trans_pcie *trans_pcie,
624 struct page **page_ptr;
626 page_ptr = (void *)((u8 *)skb->cb + trans_pcie->page_offs);
629 __free_page(*page_ptr);
634 static void iwl_pcie_clear_cmd_in_flight(struct iwl_trans *trans)
636 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
638 lockdep_assert_held(&trans_pcie->reg_lock);
640 if (trans_pcie->ref_cmd_in_flight) {
641 trans_pcie->ref_cmd_in_flight = false;
642 IWL_DEBUG_RPM(trans, "clear ref_cmd_in_flight - unref\n");
643 iwl_trans_unref(trans);
646 if (!trans->cfg->base_params->apmg_wake_up_wa)
648 if (WARN_ON(!trans_pcie->cmd_hold_nic_awake))
651 trans_pcie->cmd_hold_nic_awake = false;
652 __iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
653 BIT(trans->cfg->csr->flag_mac_access_req));
657 * iwl_pcie_txq_unmap - Unmap any remaining DMA mappings and free skb's
659 static void iwl_pcie_txq_unmap(struct iwl_trans *trans, int txq_id)
661 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
662 struct iwl_txq *txq = trans_pcie->txq[txq_id];
664 spin_lock_bh(&txq->lock);
665 while (txq->write_ptr != txq->read_ptr) {
666 IWL_DEBUG_TX_REPLY(trans, "Q %d Free %d\n",
667 txq_id, txq->read_ptr);
669 if (txq_id != trans_pcie->cmd_queue) {
670 struct sk_buff *skb = txq->entries[txq->read_ptr].skb;
672 if (WARN_ON_ONCE(!skb))
675 iwl_pcie_free_tso_page(trans_pcie, skb);
677 iwl_pcie_txq_free_tfd(trans, txq);
678 txq->read_ptr = iwl_queue_inc_wrap(trans, txq->read_ptr);
680 if (txq->read_ptr == txq->write_ptr) {
683 spin_lock_irqsave(&trans_pcie->reg_lock, flags);
684 if (txq_id != trans_pcie->cmd_queue) {
685 IWL_DEBUG_RPM(trans, "Q %d - last tx freed\n",
687 iwl_trans_unref(trans);
689 iwl_pcie_clear_cmd_in_flight(trans);
691 spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
695 while (!skb_queue_empty(&txq->overflow_q)) {
696 struct sk_buff *skb = __skb_dequeue(&txq->overflow_q);
698 iwl_op_mode_free_skb(trans->op_mode, skb);
701 spin_unlock_bh(&txq->lock);
703 /* just in case - this queue may have been stopped */
704 iwl_wake_queue(trans, txq);
708 * iwl_pcie_txq_free - Deallocate DMA queue.
709 * @txq: Transmit queue to deallocate.
711 * Empty queue by removing and destroying all BD's.
713 * 0-fill, but do not free "txq" descriptor structure.
715 static void iwl_pcie_txq_free(struct iwl_trans *trans, int txq_id)
717 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
718 struct iwl_txq *txq = trans_pcie->txq[txq_id];
719 struct device *dev = trans->dev;
725 iwl_pcie_txq_unmap(trans, txq_id);
727 /* De-alloc array of command/tx buffers */
728 if (txq_id == trans_pcie->cmd_queue)
729 for (i = 0; i < txq->n_window; i++) {
730 kzfree(txq->entries[i].cmd);
731 kzfree(txq->entries[i].free_buf);
734 /* De-alloc circular buffer of TFDs */
736 dma_free_coherent(dev,
737 trans_pcie->tfd_size *
738 trans->cfg->base_params->max_tfd_queue_size,
739 txq->tfds, txq->dma_addr);
743 dma_free_coherent(dev,
744 sizeof(*txq->first_tb_bufs) * txq->n_window,
745 txq->first_tb_bufs, txq->first_tb_dma);
751 del_timer_sync(&txq->stuck_timer);
753 /* 0-fill queue descriptor structure */
754 memset(txq, 0, sizeof(*txq));
757 void iwl_pcie_tx_start(struct iwl_trans *trans, u32 scd_base_addr)
759 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
760 int nq = trans->cfg->base_params->num_of_queues;
763 int clear_dwords = (SCD_TRANS_TBL_OFFSET_QUEUE(nq) -
764 SCD_CONTEXT_MEM_LOWER_BOUND) / sizeof(u32);
766 /* make sure all queue are not stopped/used */
767 memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped));
768 memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used));
770 trans_pcie->scd_base_addr =
771 iwl_read_prph(trans, SCD_SRAM_BASE_ADDR);
773 WARN_ON(scd_base_addr != 0 &&
774 scd_base_addr != trans_pcie->scd_base_addr);
776 /* reset context data, TX status and translation data */
777 iwl_trans_write_mem(trans, trans_pcie->scd_base_addr +
778 SCD_CONTEXT_MEM_LOWER_BOUND,
781 iwl_write_prph(trans, SCD_DRAM_BASE_ADDR,
782 trans_pcie->scd_bc_tbls.dma >> 10);
784 /* The chain extension of the SCD doesn't work well. This feature is
785 * enabled by default by the HW, so we need to disable it manually.
787 if (trans->cfg->base_params->scd_chain_ext_wa)
788 iwl_write_prph(trans, SCD_CHAINEXT_EN, 0);
790 iwl_trans_ac_txq_enable(trans, trans_pcie->cmd_queue,
791 trans_pcie->cmd_fifo,
792 trans_pcie->cmd_q_wdg_timeout);
794 /* Activate all Tx DMA/FIFO channels */
795 iwl_scd_activate_fifos(trans);
797 /* Enable DMA channel */
798 for (chan = 0; chan < FH_TCSR_CHNL_NUM; chan++)
799 iwl_write_direct32(trans, FH_TCSR_CHNL_TX_CONFIG_REG(chan),
800 FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
801 FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE);
803 /* Update FH chicken bits */
804 reg_val = iwl_read_direct32(trans, FH_TX_CHICKEN_BITS_REG);
805 iwl_write_direct32(trans, FH_TX_CHICKEN_BITS_REG,
806 reg_val | FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN);
808 /* Enable L1-Active */
809 if (trans->cfg->device_family < IWL_DEVICE_FAMILY_8000)
810 iwl_clear_bits_prph(trans, APMG_PCIDEV_STT_REG,
811 APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
814 void iwl_trans_pcie_tx_reset(struct iwl_trans *trans)
816 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
820 * we should never get here in gen2 trans mode return early to avoid
821 * having invalid accesses
823 if (WARN_ON_ONCE(trans->cfg->gen2))
826 for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;
828 struct iwl_txq *txq = trans_pcie->txq[txq_id];
829 if (trans->cfg->use_tfh)
830 iwl_write_direct64(trans,
831 FH_MEM_CBBC_QUEUE(trans, txq_id),
834 iwl_write_direct32(trans,
835 FH_MEM_CBBC_QUEUE(trans, txq_id),
837 iwl_pcie_txq_unmap(trans, txq_id);
842 /* Tell NIC where to find the "keep warm" buffer */
843 iwl_write_direct32(trans, FH_KW_MEM_ADDR_REG,
844 trans_pcie->kw.dma >> 4);
847 * Send 0 as the scd_base_addr since the device may have be reset
848 * while we were in WoWLAN in which case SCD_SRAM_BASE_ADDR will
851 iwl_pcie_tx_start(trans, 0);
854 static void iwl_pcie_tx_stop_fh(struct iwl_trans *trans)
856 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
861 spin_lock(&trans_pcie->irq_lock);
863 if (!iwl_trans_grab_nic_access(trans, &flags))
866 /* Stop each Tx DMA channel */
867 for (ch = 0; ch < FH_TCSR_CHNL_NUM; ch++) {
868 iwl_write32(trans, FH_TCSR_CHNL_TX_CONFIG_REG(ch), 0x0);
869 mask |= FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(ch);
872 /* Wait for DMA channels to be idle */
873 ret = iwl_poll_bit(trans, FH_TSSR_TX_STATUS_REG, mask, mask, 5000);
876 "Failing on timeout while stopping DMA channel %d [0x%08x]\n",
877 ch, iwl_read32(trans, FH_TSSR_TX_STATUS_REG));
879 iwl_trans_release_nic_access(trans, &flags);
882 spin_unlock(&trans_pcie->irq_lock);
886 * iwl_pcie_tx_stop - Stop all Tx DMA channels
888 int iwl_pcie_tx_stop(struct iwl_trans *trans)
890 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
893 /* Turn off all Tx DMA fifos */
894 iwl_scd_deactivate_fifos(trans);
896 /* Turn off all Tx DMA channels */
897 iwl_pcie_tx_stop_fh(trans);
900 * This function can be called before the op_mode disabled the
901 * queues. This happens when we have an rfkill interrupt.
902 * Since we stop Tx altogether - mark the queues as stopped.
904 memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped));
905 memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used));
907 /* This can happen: start_hw, stop_device */
908 if (!trans_pcie->txq_memory)
911 /* Unmap DMA from host system and free skb's */
912 for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;
914 iwl_pcie_txq_unmap(trans, txq_id);
920 * iwl_trans_tx_free - Free TXQ Context
922 * Destroy all TX DMA queues and structures
924 void iwl_pcie_tx_free(struct iwl_trans *trans)
927 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
929 memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used));
932 if (trans_pcie->txq_memory) {
934 txq_id < trans->cfg->base_params->num_of_queues;
936 iwl_pcie_txq_free(trans, txq_id);
937 trans_pcie->txq[txq_id] = NULL;
941 kfree(trans_pcie->txq_memory);
942 trans_pcie->txq_memory = NULL;
944 iwl_pcie_free_dma_ptr(trans, &trans_pcie->kw);
946 iwl_pcie_free_dma_ptr(trans, &trans_pcie->scd_bc_tbls);
950 * iwl_pcie_tx_alloc - allocate TX context
951 * Allocate all Tx DMA structures and initialize them
953 static int iwl_pcie_tx_alloc(struct iwl_trans *trans)
956 int txq_id, slots_num;
957 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
958 u16 bc_tbls_size = trans->cfg->base_params->num_of_queues;
960 bc_tbls_size *= (trans->cfg->device_family >= IWL_DEVICE_FAMILY_22560) ?
961 sizeof(struct iwl_gen3_bc_tbl) :
962 sizeof(struct iwlagn_scd_bc_tbl);
964 /*It is not allowed to alloc twice, so warn when this happens.
965 * We cannot rely on the previous allocation, so free and fail */
966 if (WARN_ON(trans_pcie->txq_memory)) {
971 ret = iwl_pcie_alloc_dma_ptr(trans, &trans_pcie->scd_bc_tbls,
974 IWL_ERR(trans, "Scheduler BC Table allocation failed\n");
978 /* Alloc keep-warm buffer */
979 ret = iwl_pcie_alloc_dma_ptr(trans, &trans_pcie->kw, IWL_KW_SIZE);
981 IWL_ERR(trans, "Keep Warm allocation failed\n");
985 trans_pcie->txq_memory = kcalloc(trans->cfg->base_params->num_of_queues,
986 sizeof(struct iwl_txq), GFP_KERNEL);
987 if (!trans_pcie->txq_memory) {
988 IWL_ERR(trans, "Not enough memory for txq\n");
993 /* Alloc and init all Tx queues, including the command queue (#4/#9) */
994 for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;
996 bool cmd_queue = (txq_id == trans_pcie->cmd_queue);
999 slots_num = max_t(u32, TFD_CMD_SLOTS,
1000 trans->cfg->min_txq_size);
1002 slots_num = TFD_TX_CMD_SLOTS;
1003 trans_pcie->txq[txq_id] = &trans_pcie->txq_memory[txq_id];
1004 ret = iwl_pcie_txq_alloc(trans, trans_pcie->txq[txq_id],
1005 slots_num, cmd_queue);
1007 IWL_ERR(trans, "Tx %d queue alloc failed\n", txq_id);
1010 trans_pcie->txq[txq_id]->id = txq_id;
1016 iwl_pcie_tx_free(trans);
1021 int iwl_pcie_tx_init(struct iwl_trans *trans)
1023 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1025 int txq_id, slots_num;
1028 if (!trans_pcie->txq_memory) {
1029 ret = iwl_pcie_tx_alloc(trans);
1035 spin_lock(&trans_pcie->irq_lock);
1037 /* Turn off all Tx DMA fifos */
1038 iwl_scd_deactivate_fifos(trans);
1040 /* Tell NIC where to find the "keep warm" buffer */
1041 iwl_write_direct32(trans, FH_KW_MEM_ADDR_REG,
1042 trans_pcie->kw.dma >> 4);
1044 spin_unlock(&trans_pcie->irq_lock);
1046 /* Alloc and init all Tx queues, including the command queue (#4/#9) */
1047 for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;
1049 bool cmd_queue = (txq_id == trans_pcie->cmd_queue);
1052 slots_num = max_t(u32, TFD_CMD_SLOTS,
1053 trans->cfg->min_txq_size);
1055 slots_num = TFD_TX_CMD_SLOTS;
1056 ret = iwl_pcie_txq_init(trans, trans_pcie->txq[txq_id],
1057 slots_num, cmd_queue);
1059 IWL_ERR(trans, "Tx %d queue init failed\n", txq_id);
1064 * Tell nic where to find circular buffer of TFDs for a
1065 * given Tx queue, and enable the DMA channel used for that
1067 * Circular buffer (TFD queue in DRAM) physical base address
1069 iwl_write_direct32(trans, FH_MEM_CBBC_QUEUE(trans, txq_id),
1070 trans_pcie->txq[txq_id]->dma_addr >> 8);
1073 iwl_set_bits_prph(trans, SCD_GP_CTRL, SCD_GP_CTRL_AUTO_ACTIVE_MODE);
1074 if (trans->cfg->base_params->num_of_queues > 20)
1075 iwl_set_bits_prph(trans, SCD_GP_CTRL,
1076 SCD_GP_CTRL_ENABLE_31_QUEUES);
1080 /*Upon error, free only if we allocated something */
1082 iwl_pcie_tx_free(trans);
1086 static inline void iwl_pcie_txq_progress(struct iwl_txq *txq)
1088 lockdep_assert_held(&txq->lock);
1090 if (!txq->wd_timeout)
1094 * station is asleep and we send data - that must
1095 * be uAPSD or PS-Poll. Don't rearm the timer.
1101 * if empty delete timer, otherwise move timer forward
1102 * since we're making progress on this queue
1104 if (txq->read_ptr == txq->write_ptr)
1105 del_timer(&txq->stuck_timer);
1107 mod_timer(&txq->stuck_timer, jiffies + txq->wd_timeout);
1110 /* Frees buffers until index _not_ inclusive */
1111 void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn,
1112 struct sk_buff_head *skbs)
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 tfd_num = iwl_pcie_get_cmd_index(txq, ssn);
1117 int read_ptr = iwl_pcie_get_cmd_index(txq, txq->read_ptr);
1120 /* This function is not meant to release cmd queue*/
1121 if (WARN_ON(txq_id == trans_pcie->cmd_queue))
1124 spin_lock_bh(&txq->lock);
1126 if (!test_bit(txq_id, trans_pcie->queue_used)) {
1127 IWL_DEBUG_TX_QUEUES(trans, "Q %d inactive - ignoring idx %d\n",
1132 if (read_ptr == tfd_num)
1135 IWL_DEBUG_TX_REPLY(trans, "[Q %d] %d -> %d (%d)\n",
1136 txq_id, txq->read_ptr, tfd_num, ssn);
1138 /*Since we free until index _not_ inclusive, the one before index is
1139 * the last we will free. This one must be used */
1140 last_to_free = iwl_queue_dec_wrap(trans, tfd_num);
1142 if (!iwl_queue_used(txq, last_to_free)) {
1144 "%s: Read index for txq id (%d), last_to_free %d is out of range [0-%d] %d %d.\n",
1145 __func__, txq_id, last_to_free,
1146 trans->cfg->base_params->max_tfd_queue_size,
1147 txq->write_ptr, txq->read_ptr);
1151 if (WARN_ON(!skb_queue_empty(skbs)))
1155 read_ptr != tfd_num;
1156 txq->read_ptr = iwl_queue_inc_wrap(trans, txq->read_ptr),
1157 read_ptr = iwl_pcie_get_cmd_index(txq, txq->read_ptr)) {
1158 struct sk_buff *skb = txq->entries[read_ptr].skb;
1160 if (WARN_ON_ONCE(!skb))
1163 iwl_pcie_free_tso_page(trans_pcie, skb);
1165 __skb_queue_tail(skbs, skb);
1167 txq->entries[read_ptr].skb = NULL;
1169 if (!trans->cfg->use_tfh)
1170 iwl_pcie_txq_inval_byte_cnt_tbl(trans, txq);
1172 iwl_pcie_txq_free_tfd(trans, txq);
1175 iwl_pcie_txq_progress(txq);
1177 if (iwl_queue_space(trans, txq) > txq->low_mark &&
1178 test_bit(txq_id, trans_pcie->queue_stopped)) {
1179 struct sk_buff_head overflow_skbs;
1181 __skb_queue_head_init(&overflow_skbs);
1182 skb_queue_splice_init(&txq->overflow_q, &overflow_skbs);
1185 * We are going to transmit from the overflow queue.
1186 * Remember this state so that wait_for_txq_empty will know we
1187 * are adding more packets to the TFD queue. It cannot rely on
1188 * the state of &txq->overflow_q, as we just emptied it, but
1189 * haven't TXed the content yet.
1191 txq->overflow_tx = true;
1194 * This is tricky: we are in reclaim path which is non
1195 * re-entrant, so noone will try to take the access the
1196 * txq data from that path. We stopped tx, so we can't
1197 * have tx as well. Bottom line, we can unlock and re-lock
1200 spin_unlock_bh(&txq->lock);
1202 while (!skb_queue_empty(&overflow_skbs)) {
1203 struct sk_buff *skb = __skb_dequeue(&overflow_skbs);
1204 struct iwl_device_cmd *dev_cmd_ptr;
1206 dev_cmd_ptr = *(void **)((u8 *)skb->cb +
1207 trans_pcie->dev_cmd_offs);
1210 * Note that we can very well be overflowing again.
1211 * In that case, iwl_queue_space will be small again
1212 * and we won't wake mac80211's queue.
1214 iwl_trans_tx(trans, skb, dev_cmd_ptr, txq_id);
1217 if (iwl_queue_space(trans, txq) > txq->low_mark)
1218 iwl_wake_queue(trans, txq);
1220 spin_lock_bh(&txq->lock);
1221 txq->overflow_tx = false;
1224 if (txq->read_ptr == txq->write_ptr) {
1225 IWL_DEBUG_RPM(trans, "Q %d - last tx reclaimed\n", txq->id);
1226 iwl_trans_unref(trans);
1230 spin_unlock_bh(&txq->lock);
1233 static int iwl_pcie_set_cmd_in_flight(struct iwl_trans *trans,
1234 const struct iwl_host_cmd *cmd)
1236 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1237 const struct iwl_cfg *cfg = trans->cfg;
1240 lockdep_assert_held(&trans_pcie->reg_lock);
1242 /* Make sure the NIC is still alive in the bus */
1243 if (test_bit(STATUS_TRANS_DEAD, &trans->status))
1246 if (!(cmd->flags & CMD_SEND_IN_IDLE) &&
1247 !trans_pcie->ref_cmd_in_flight) {
1248 trans_pcie->ref_cmd_in_flight = true;
1249 IWL_DEBUG_RPM(trans, "set ref_cmd_in_flight - ref\n");
1250 iwl_trans_ref(trans);
1254 * wake up the NIC to make sure that the firmware will see the host
1255 * command - we will let the NIC sleep once all the host commands
1256 * returned. This needs to be done only on NICs that have
1257 * apmg_wake_up_wa set.
1259 if (cfg->base_params->apmg_wake_up_wa &&
1260 !trans_pcie->cmd_hold_nic_awake) {
1261 __iwl_trans_pcie_set_bit(trans, CSR_GP_CNTRL,
1262 BIT(cfg->csr->flag_mac_access_req));
1264 ret = iwl_poll_bit(trans, CSR_GP_CNTRL,
1265 BIT(cfg->csr->flag_val_mac_access_en),
1266 (BIT(cfg->csr->flag_mac_clock_ready) |
1267 CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP),
1270 __iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
1271 BIT(cfg->csr->flag_mac_access_req));
1272 IWL_ERR(trans, "Failed to wake NIC for hcmd\n");
1275 trans_pcie->cmd_hold_nic_awake = true;
1282 * iwl_pcie_cmdq_reclaim - Reclaim TX command queue entries already Tx'd
1284 * When FW advances 'R' index, all entries between old and new 'R' index
1285 * need to be reclaimed. As result, some free space forms. If there is
1286 * enough free space (> low mark), wake the stack that feeds us.
1288 void iwl_pcie_cmdq_reclaim(struct iwl_trans *trans, int txq_id, int idx)
1290 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1291 struct iwl_txq *txq = trans_pcie->txq[txq_id];
1292 unsigned long flags;
1296 lockdep_assert_held(&txq->lock);
1298 idx = iwl_pcie_get_cmd_index(txq, idx);
1299 r = iwl_pcie_get_cmd_index(txq, txq->read_ptr);
1301 if (idx >= trans->cfg->base_params->max_tfd_queue_size ||
1302 (!iwl_queue_used(txq, idx))) {
1303 WARN_ONCE(test_bit(txq_id, trans_pcie->queue_used),
1304 "%s: Read index for DMA queue txq id (%d), index %d is out of range [0-%d] %d %d.\n",
1305 __func__, txq_id, idx,
1306 trans->cfg->base_params->max_tfd_queue_size,
1307 txq->write_ptr, txq->read_ptr);
1311 for (idx = iwl_queue_inc_wrap(trans, idx); r != idx;
1312 r = iwl_queue_inc_wrap(trans, r)) {
1313 txq->read_ptr = iwl_queue_inc_wrap(trans, txq->read_ptr);
1316 IWL_ERR(trans, "HCMD skipped: index (%d) %d %d\n",
1317 idx, txq->write_ptr, r);
1318 iwl_force_nmi(trans);
1322 if (txq->read_ptr == txq->write_ptr) {
1323 spin_lock_irqsave(&trans_pcie->reg_lock, flags);
1324 iwl_pcie_clear_cmd_in_flight(trans);
1325 spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
1328 iwl_pcie_txq_progress(txq);
1331 static int iwl_pcie_txq_set_ratid_map(struct iwl_trans *trans, u16 ra_tid,
1334 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1339 scd_q2ratid = ra_tid & SCD_QUEUE_RA_TID_MAP_RATID_MSK;
1341 tbl_dw_addr = trans_pcie->scd_base_addr +
1342 SCD_TRANS_TBL_OFFSET_QUEUE(txq_id);
1344 tbl_dw = iwl_trans_read_mem32(trans, tbl_dw_addr);
1347 tbl_dw = (scd_q2ratid << 16) | (tbl_dw & 0x0000FFFF);
1349 tbl_dw = scd_q2ratid | (tbl_dw & 0xFFFF0000);
1351 iwl_trans_write_mem32(trans, tbl_dw_addr, tbl_dw);
1356 /* Receiver address (actually, Rx station's index into station table),
1357 * combined with Traffic ID (QOS priority), in format used by Tx Scheduler */
1358 #define BUILD_RAxTID(sta_id, tid) (((sta_id) << 4) + (tid))
1360 bool iwl_trans_pcie_txq_enable(struct iwl_trans *trans, int txq_id, u16 ssn,
1361 const struct iwl_trans_txq_scd_cfg *cfg,
1362 unsigned int wdg_timeout)
1364 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1365 struct iwl_txq *txq = trans_pcie->txq[txq_id];
1367 bool scd_bug = false;
1369 if (test_and_set_bit(txq_id, trans_pcie->queue_used))
1370 WARN_ONCE(1, "queue %d already used - expect issues", txq_id);
1372 txq->wd_timeout = msecs_to_jiffies(wdg_timeout);
1377 /* Disable the scheduler prior configuring the cmd queue */
1378 if (txq_id == trans_pcie->cmd_queue &&
1379 trans_pcie->scd_set_active)
1380 iwl_scd_enable_set_active(trans, 0);
1382 /* Stop this Tx queue before configuring it */
1383 iwl_scd_txq_set_inactive(trans, txq_id);
1385 /* Set this queue as a chain-building queue unless it is CMD */
1386 if (txq_id != trans_pcie->cmd_queue)
1387 iwl_scd_txq_set_chain(trans, txq_id);
1389 if (cfg->aggregate) {
1390 u16 ra_tid = BUILD_RAxTID(cfg->sta_id, cfg->tid);
1392 /* Map receiver-address / traffic-ID to this queue */
1393 iwl_pcie_txq_set_ratid_map(trans, ra_tid, txq_id);
1395 /* enable aggregations for the queue */
1396 iwl_scd_txq_enable_agg(trans, txq_id);
1400 * disable aggregations for the queue, this will also
1401 * make the ra_tid mapping configuration irrelevant
1402 * since it is now a non-AGG queue.
1404 iwl_scd_txq_disable_agg(trans, txq_id);
1406 ssn = txq->read_ptr;
1410 * If we need to move the SCD write pointer by steps of
1411 * 0x40, 0x80 or 0xc0, it gets stuck. Avoids this and let
1412 * the op_mode know by returning true later.
1413 * Do this only in case cfg is NULL since this trick can
1414 * be done only if we have DQA enabled which is true for mvm
1415 * only. And mvm never sets a cfg pointer.
1416 * This is really ugly, but this is the easiest way out for
1417 * this sad hardware issue.
1418 * This bug has been fixed on devices 9000 and up.
1420 scd_bug = !trans->cfg->mq_rx_supported &&
1421 !((ssn - txq->write_ptr) & 0x3f) &&
1422 (ssn != txq->write_ptr);
1427 /* Place first TFD at index corresponding to start sequence number.
1428 * Assumes that ssn_idx is valid (!= 0xFFF) */
1429 txq->read_ptr = (ssn & 0xff);
1430 txq->write_ptr = (ssn & 0xff);
1431 iwl_write_direct32(trans, HBUS_TARG_WRPTR,
1432 (ssn & 0xff) | (txq_id << 8));
1435 u8 frame_limit = cfg->frame_limit;
1437 iwl_write_prph(trans, SCD_QUEUE_RDPTR(txq_id), ssn);
1439 /* Set up Tx window size and frame limit for this queue */
1440 iwl_trans_write_mem32(trans, trans_pcie->scd_base_addr +
1441 SCD_CONTEXT_QUEUE_OFFSET(txq_id), 0);
1442 iwl_trans_write_mem32(trans,
1443 trans_pcie->scd_base_addr +
1444 SCD_CONTEXT_QUEUE_OFFSET(txq_id) + sizeof(u32),
1445 SCD_QUEUE_CTX_REG2_VAL(WIN_SIZE, frame_limit) |
1446 SCD_QUEUE_CTX_REG2_VAL(FRAME_LIMIT, frame_limit));
1448 /* Set up status area in SRAM, map to Tx DMA/FIFO, activate */
1449 iwl_write_prph(trans, SCD_QUEUE_STATUS_BITS(txq_id),
1450 (1 << SCD_QUEUE_STTS_REG_POS_ACTIVE) |
1451 (cfg->fifo << SCD_QUEUE_STTS_REG_POS_TXF) |
1452 (1 << SCD_QUEUE_STTS_REG_POS_WSL) |
1453 SCD_QUEUE_STTS_REG_MSK);
1455 /* enable the scheduler for this queue (only) */
1456 if (txq_id == trans_pcie->cmd_queue &&
1457 trans_pcie->scd_set_active)
1458 iwl_scd_enable_set_active(trans, BIT(txq_id));
1460 IWL_DEBUG_TX_QUEUES(trans,
1461 "Activate queue %d on FIFO %d WrPtr: %d\n",
1462 txq_id, fifo, ssn & 0xff);
1464 IWL_DEBUG_TX_QUEUES(trans,
1465 "Activate queue %d WrPtr: %d\n",
1466 txq_id, ssn & 0xff);
1472 void iwl_trans_pcie_txq_set_shared_mode(struct iwl_trans *trans, u32 txq_id,
1475 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1476 struct iwl_txq *txq = trans_pcie->txq[txq_id];
1478 txq->ampdu = !shared_mode;
1481 void iwl_trans_pcie_txq_disable(struct iwl_trans *trans, int txq_id,
1484 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1485 u32 stts_addr = trans_pcie->scd_base_addr +
1486 SCD_TX_STTS_QUEUE_OFFSET(txq_id);
1487 static const u32 zero_val[4] = {};
1489 trans_pcie->txq[txq_id]->frozen_expiry_remainder = 0;
1490 trans_pcie->txq[txq_id]->frozen = false;
1493 * Upon HW Rfkill - we stop the device, and then stop the queues
1494 * in the op_mode. Just for the sake of the simplicity of the op_mode,
1495 * allow the op_mode to call txq_disable after it already called
1498 if (!test_and_clear_bit(txq_id, trans_pcie->queue_used)) {
1499 WARN_ONCE(test_bit(STATUS_DEVICE_ENABLED, &trans->status),
1500 "queue %d not used", txq_id);
1504 if (configure_scd) {
1505 iwl_scd_txq_set_inactive(trans, txq_id);
1507 iwl_trans_write_mem(trans, stts_addr, (void *)zero_val,
1508 ARRAY_SIZE(zero_val));
1511 iwl_pcie_txq_unmap(trans, txq_id);
1512 trans_pcie->txq[txq_id]->ampdu = false;
1514 IWL_DEBUG_TX_QUEUES(trans, "Deactivate queue %d\n", txq_id);
1517 /*************** HOST COMMAND QUEUE FUNCTIONS *****/
1520 * iwl_pcie_enqueue_hcmd - enqueue a uCode command
1521 * @priv: device private data point
1522 * @cmd: a pointer to the ucode command structure
1524 * The function returns < 0 values to indicate the operation
1525 * failed. On success, it returns the index (>= 0) of command in the
1528 static int iwl_pcie_enqueue_hcmd(struct iwl_trans *trans,
1529 struct iwl_host_cmd *cmd)
1531 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1532 struct iwl_txq *txq = trans_pcie->txq[trans_pcie->cmd_queue];
1533 struct iwl_device_cmd *out_cmd;
1534 struct iwl_cmd_meta *out_meta;
1535 unsigned long flags;
1536 void *dup_buf = NULL;
1537 dma_addr_t phys_addr;
1539 u16 copy_size, cmd_size, tb0_size;
1540 bool had_nocopy = false;
1541 u8 group_id = iwl_cmd_groupid(cmd->id);
1544 const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
1545 u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
1547 if (WARN(!trans->wide_cmd_header &&
1548 group_id > IWL_ALWAYS_LONG_GROUP,
1549 "unsupported wide command %#x\n", cmd->id))
1552 if (group_id != 0) {
1553 copy_size = sizeof(struct iwl_cmd_header_wide);
1554 cmd_size = sizeof(struct iwl_cmd_header_wide);
1556 copy_size = sizeof(struct iwl_cmd_header);
1557 cmd_size = sizeof(struct iwl_cmd_header);
1560 /* need one for the header if the first is NOCOPY */
1561 BUILD_BUG_ON(IWL_MAX_CMD_TBS_PER_TFD > IWL_NUM_OF_TBS - 1);
1563 for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
1564 cmddata[i] = cmd->data[i];
1565 cmdlen[i] = cmd->len[i];
1570 /* need at least IWL_FIRST_TB_SIZE copied */
1571 if (copy_size < IWL_FIRST_TB_SIZE) {
1572 int copy = IWL_FIRST_TB_SIZE - copy_size;
1574 if (copy > cmdlen[i])
1581 if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) {
1583 if (WARN_ON(cmd->dataflags[i] & IWL_HCMD_DFL_DUP)) {
1587 } else if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP) {
1589 * This is also a chunk that isn't copied
1590 * to the static buffer so set had_nocopy.
1594 /* only allowed once */
1595 if (WARN_ON(dup_buf)) {
1600 dup_buf = kmemdup(cmddata[i], cmdlen[i],
1605 /* NOCOPY must not be followed by normal! */
1606 if (WARN_ON(had_nocopy)) {
1610 copy_size += cmdlen[i];
1612 cmd_size += cmd->len[i];
1616 * If any of the command structures end up being larger than
1617 * the TFD_MAX_PAYLOAD_SIZE and they aren't dynamically
1618 * allocated into separate TFDs, then we will need to
1619 * increase the size of the buffers.
1621 if (WARN(copy_size > TFD_MAX_PAYLOAD_SIZE,
1622 "Command %s (%#x) is too large (%d bytes)\n",
1623 iwl_get_cmd_string(trans, cmd->id),
1624 cmd->id, copy_size)) {
1629 spin_lock_bh(&txq->lock);
1631 if (iwl_queue_space(trans, txq) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
1632 spin_unlock_bh(&txq->lock);
1634 IWL_ERR(trans, "No space in command queue\n");
1635 iwl_op_mode_cmd_queue_full(trans->op_mode);
1640 idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr);
1641 out_cmd = txq->entries[idx].cmd;
1642 out_meta = &txq->entries[idx].meta;
1644 memset(out_meta, 0, sizeof(*out_meta)); /* re-initialize to NULL */
1645 if (cmd->flags & CMD_WANT_SKB)
1646 out_meta->source = cmd;
1648 /* set up the header */
1649 if (group_id != 0) {
1650 out_cmd->hdr_wide.cmd = iwl_cmd_opcode(cmd->id);
1651 out_cmd->hdr_wide.group_id = group_id;
1652 out_cmd->hdr_wide.version = iwl_cmd_version(cmd->id);
1653 out_cmd->hdr_wide.length =
1654 cpu_to_le16(cmd_size -
1655 sizeof(struct iwl_cmd_header_wide));
1656 out_cmd->hdr_wide.reserved = 0;
1657 out_cmd->hdr_wide.sequence =
1658 cpu_to_le16(QUEUE_TO_SEQ(trans_pcie->cmd_queue) |
1659 INDEX_TO_SEQ(txq->write_ptr));
1661 cmd_pos = sizeof(struct iwl_cmd_header_wide);
1662 copy_size = sizeof(struct iwl_cmd_header_wide);
1664 out_cmd->hdr.cmd = iwl_cmd_opcode(cmd->id);
1665 out_cmd->hdr.sequence =
1666 cpu_to_le16(QUEUE_TO_SEQ(trans_pcie->cmd_queue) |
1667 INDEX_TO_SEQ(txq->write_ptr));
1668 out_cmd->hdr.group_id = 0;
1670 cmd_pos = sizeof(struct iwl_cmd_header);
1671 copy_size = sizeof(struct iwl_cmd_header);
1674 /* and copy the data that needs to be copied */
1675 for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
1681 /* copy everything if not nocopy/dup */
1682 if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
1683 IWL_HCMD_DFL_DUP))) {
1686 memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
1693 * Otherwise we need at least IWL_FIRST_TB_SIZE copied
1694 * in total (for bi-directional DMA), but copy up to what
1695 * we can fit into the payload for debug dump purposes.
1697 copy = min_t(int, TFD_MAX_PAYLOAD_SIZE - cmd_pos, cmd->len[i]);
1699 memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
1702 /* However, treat copy_size the proper way, we need it below */
1703 if (copy_size < IWL_FIRST_TB_SIZE) {
1704 copy = IWL_FIRST_TB_SIZE - copy_size;
1706 if (copy > cmd->len[i])
1713 "Sending command %s (%.2x.%.2x), seq: 0x%04X, %d bytes at %d[%d]:%d\n",
1714 iwl_get_cmd_string(trans, cmd->id),
1715 group_id, out_cmd->hdr.cmd,
1716 le16_to_cpu(out_cmd->hdr.sequence),
1717 cmd_size, txq->write_ptr, idx, trans_pcie->cmd_queue);
1719 /* start the TFD with the minimum copy bytes */
1720 tb0_size = min_t(int, copy_size, IWL_FIRST_TB_SIZE);
1721 memcpy(&txq->first_tb_bufs[idx], &out_cmd->hdr, tb0_size);
1722 iwl_pcie_txq_build_tfd(trans, txq,
1723 iwl_pcie_get_first_tb_dma(txq, idx),
1726 /* map first command fragment, if any remains */
1727 if (copy_size > tb0_size) {
1728 phys_addr = dma_map_single(trans->dev,
1729 ((u8 *)&out_cmd->hdr) + tb0_size,
1730 copy_size - tb0_size,
1732 if (dma_mapping_error(trans->dev, phys_addr)) {
1733 iwl_pcie_tfd_unmap(trans, out_meta, txq,
1739 iwl_pcie_txq_build_tfd(trans, txq, phys_addr,
1740 copy_size - tb0_size, false);
1743 /* map the remaining (adjusted) nocopy/dup fragments */
1744 for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
1745 const void *data = cmddata[i];
1749 if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
1752 if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP)
1754 phys_addr = dma_map_single(trans->dev, (void *)data,
1755 cmdlen[i], DMA_TO_DEVICE);
1756 if (dma_mapping_error(trans->dev, phys_addr)) {
1757 iwl_pcie_tfd_unmap(trans, out_meta, txq,
1763 iwl_pcie_txq_build_tfd(trans, txq, phys_addr, cmdlen[i], false);
1766 BUILD_BUG_ON(IWL_TFH_NUM_TBS > sizeof(out_meta->tbs) * BITS_PER_BYTE);
1767 out_meta->flags = cmd->flags;
1768 if (WARN_ON_ONCE(txq->entries[idx].free_buf))
1769 kzfree(txq->entries[idx].free_buf);
1770 txq->entries[idx].free_buf = dup_buf;
1772 trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size, &out_cmd->hdr_wide);
1774 /* start timer if queue currently empty */
1775 if (txq->read_ptr == txq->write_ptr && txq->wd_timeout)
1776 mod_timer(&txq->stuck_timer, jiffies + txq->wd_timeout);
1778 spin_lock_irqsave(&trans_pcie->reg_lock, flags);
1779 ret = iwl_pcie_set_cmd_in_flight(trans, cmd);
1782 spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
1786 /* Increment and update queue's write index */
1787 txq->write_ptr = iwl_queue_inc_wrap(trans, txq->write_ptr);
1788 iwl_pcie_txq_inc_wr_ptr(trans, txq);
1790 spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
1793 spin_unlock_bh(&txq->lock);
1801 * iwl_pcie_hcmd_complete - Pull unused buffers off the queue and reclaim them
1802 * @rxb: Rx buffer to reclaim
1804 void iwl_pcie_hcmd_complete(struct iwl_trans *trans,
1805 struct iwl_rx_cmd_buffer *rxb)
1807 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1808 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
1811 int txq_id = SEQ_TO_QUEUE(sequence);
1812 int index = SEQ_TO_INDEX(sequence);
1814 struct iwl_device_cmd *cmd;
1815 struct iwl_cmd_meta *meta;
1816 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1817 struct iwl_txq *txq = trans_pcie->txq[trans_pcie->cmd_queue];
1819 /* If a Tx command is being handled and it isn't in the actual
1820 * command queue then there a command routing bug has been introduced
1821 * in the queue management code. */
1822 if (WARN(txq_id != trans_pcie->cmd_queue,
1823 "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n",
1824 txq_id, trans_pcie->cmd_queue, sequence, txq->read_ptr,
1826 iwl_print_hex_error(trans, pkt, 32);
1830 spin_lock_bh(&txq->lock);
1832 cmd_index = iwl_pcie_get_cmd_index(txq, index);
1833 cmd = txq->entries[cmd_index].cmd;
1834 meta = &txq->entries[cmd_index].meta;
1835 group_id = cmd->hdr.group_id;
1836 cmd_id = iwl_cmd_id(cmd->hdr.cmd, group_id, 0);
1838 iwl_pcie_tfd_unmap(trans, meta, txq, index);
1840 /* Input error checking is done when commands are added to queue. */
1841 if (meta->flags & CMD_WANT_SKB) {
1842 struct page *p = rxb_steal_page(rxb);
1844 meta->source->resp_pkt = pkt;
1845 meta->source->_rx_page_addr = (unsigned long)page_address(p);
1846 meta->source->_rx_page_order = trans_pcie->rx_page_order;
1849 if (meta->flags & CMD_WANT_ASYNC_CALLBACK)
1850 iwl_op_mode_async_cb(trans->op_mode, cmd);
1852 iwl_pcie_cmdq_reclaim(trans, txq_id, index);
1854 if (!(meta->flags & CMD_ASYNC)) {
1855 if (!test_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status)) {
1857 "HCMD_ACTIVE already clear for command %s\n",
1858 iwl_get_cmd_string(trans, cmd_id));
1860 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
1861 IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n",
1862 iwl_get_cmd_string(trans, cmd_id));
1863 wake_up(&trans_pcie->wait_command_queue);
1866 if (meta->flags & CMD_MAKE_TRANS_IDLE) {
1867 IWL_DEBUG_INFO(trans, "complete %s - mark trans as idle\n",
1868 iwl_get_cmd_string(trans, cmd->hdr.cmd));
1869 set_bit(STATUS_TRANS_IDLE, &trans->status);
1870 wake_up(&trans_pcie->d0i3_waitq);
1873 if (meta->flags & CMD_WAKE_UP_TRANS) {
1874 IWL_DEBUG_INFO(trans, "complete %s - clear trans idle flag\n",
1875 iwl_get_cmd_string(trans, cmd->hdr.cmd));
1876 clear_bit(STATUS_TRANS_IDLE, &trans->status);
1877 wake_up(&trans_pcie->d0i3_waitq);
1882 spin_unlock_bh(&txq->lock);
1885 #define HOST_COMPLETE_TIMEOUT (2 * HZ)
1887 static int iwl_pcie_send_hcmd_async(struct iwl_trans *trans,
1888 struct iwl_host_cmd *cmd)
1892 /* An asynchronous command can not expect an SKB to be set. */
1893 if (WARN_ON(cmd->flags & CMD_WANT_SKB))
1896 ret = iwl_pcie_enqueue_hcmd(trans, cmd);
1899 "Error sending %s: enqueue_hcmd failed: %d\n",
1900 iwl_get_cmd_string(trans, cmd->id), ret);
1906 static int iwl_pcie_send_hcmd_sync(struct iwl_trans *trans,
1907 struct iwl_host_cmd *cmd)
1909 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1910 struct iwl_txq *txq = trans_pcie->txq[trans_pcie->cmd_queue];
1914 IWL_DEBUG_INFO(trans, "Attempting to send sync command %s\n",
1915 iwl_get_cmd_string(trans, cmd->id));
1917 if (WARN(test_and_set_bit(STATUS_SYNC_HCMD_ACTIVE,
1919 "Command %s: a command is already active!\n",
1920 iwl_get_cmd_string(trans, cmd->id)))
1923 IWL_DEBUG_INFO(trans, "Setting HCMD_ACTIVE for command %s\n",
1924 iwl_get_cmd_string(trans, cmd->id));
1926 if (pm_runtime_suspended(&trans_pcie->pci_dev->dev)) {
1927 ret = wait_event_timeout(trans_pcie->d0i3_waitq,
1928 pm_runtime_active(&trans_pcie->pci_dev->dev),
1929 msecs_to_jiffies(IWL_TRANS_IDLE_TIMEOUT));
1931 IWL_ERR(trans, "Timeout exiting D0i3 before hcmd\n");
1936 cmd_idx = iwl_pcie_enqueue_hcmd(trans, cmd);
1939 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
1941 "Error sending %s: enqueue_hcmd failed: %d\n",
1942 iwl_get_cmd_string(trans, cmd->id), ret);
1946 ret = wait_event_timeout(trans_pcie->wait_command_queue,
1947 !test_bit(STATUS_SYNC_HCMD_ACTIVE,
1949 HOST_COMPLETE_TIMEOUT);
1951 IWL_ERR(trans, "Error sending %s: time out after %dms.\n",
1952 iwl_get_cmd_string(trans, cmd->id),
1953 jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
1955 IWL_ERR(trans, "Current CMD queue read_ptr %d write_ptr %d\n",
1956 txq->read_ptr, txq->write_ptr);
1958 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
1959 IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n",
1960 iwl_get_cmd_string(trans, cmd->id));
1963 iwl_trans_sync_nmi(trans);
1967 if (test_bit(STATUS_FW_ERROR, &trans->status)) {
1968 iwl_trans_pcie_dump_regs(trans);
1969 IWL_ERR(trans, "FW error in SYNC CMD %s\n",
1970 iwl_get_cmd_string(trans, cmd->id));
1976 if (!(cmd->flags & CMD_SEND_IN_RFKILL) &&
1977 test_bit(STATUS_RFKILL_OPMODE, &trans->status)) {
1978 IWL_DEBUG_RF_KILL(trans, "RFKILL in SYNC CMD... no rsp\n");
1983 if ((cmd->flags & CMD_WANT_SKB) && !cmd->resp_pkt) {
1984 IWL_ERR(trans, "Error: Response NULL in '%s'\n",
1985 iwl_get_cmd_string(trans, cmd->id));
1993 if (cmd->flags & CMD_WANT_SKB) {
1995 * Cancel the CMD_WANT_SKB flag for the cmd in the
1996 * TX cmd queue. Otherwise in case the cmd comes
1997 * in later, it will possibly set an invalid
1998 * address (cmd->meta.source).
2000 txq->entries[cmd_idx].meta.flags &= ~CMD_WANT_SKB;
2003 if (cmd->resp_pkt) {
2005 cmd->resp_pkt = NULL;
2011 int iwl_trans_pcie_send_hcmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd)
2013 /* Make sure the NIC is still alive in the bus */
2014 if (test_bit(STATUS_TRANS_DEAD, &trans->status))
2017 if (!(cmd->flags & CMD_SEND_IN_RFKILL) &&
2018 test_bit(STATUS_RFKILL_OPMODE, &trans->status)) {
2019 IWL_DEBUG_RF_KILL(trans, "Dropping CMD 0x%x: RF KILL\n",
2024 if (cmd->flags & CMD_ASYNC)
2025 return iwl_pcie_send_hcmd_async(trans, cmd);
2027 /* We still can fail on RFKILL that can be asserted while we wait */
2028 return iwl_pcie_send_hcmd_sync(trans, cmd);
2031 static int iwl_fill_data_tbs(struct iwl_trans *trans, struct sk_buff *skb,
2032 struct iwl_txq *txq, u8 hdr_len,
2033 struct iwl_cmd_meta *out_meta)
2039 * Set up TFD's third entry to point directly to remainder
2040 * of skb's head, if any
2042 head_tb_len = skb_headlen(skb) - hdr_len;
2044 if (head_tb_len > 0) {
2045 dma_addr_t tb_phys = dma_map_single(trans->dev,
2046 skb->data + hdr_len,
2047 head_tb_len, DMA_TO_DEVICE);
2048 if (unlikely(dma_mapping_error(trans->dev, tb_phys)))
2050 trace_iwlwifi_dev_tx_tb(trans->dev, skb,
2051 skb->data + hdr_len,
2053 iwl_pcie_txq_build_tfd(trans, txq, tb_phys, head_tb_len, false);
2056 /* set up the remaining entries to point to the data */
2057 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2058 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2062 if (!skb_frag_size(frag))
2065 tb_phys = skb_frag_dma_map(trans->dev, frag, 0,
2066 skb_frag_size(frag), DMA_TO_DEVICE);
2068 if (unlikely(dma_mapping_error(trans->dev, tb_phys)))
2070 trace_iwlwifi_dev_tx_tb(trans->dev, skb,
2071 skb_frag_address(frag),
2072 skb_frag_size(frag));
2073 tb_idx = iwl_pcie_txq_build_tfd(trans, txq, tb_phys,
2074 skb_frag_size(frag), false);
2078 out_meta->tbs |= BIT(tb_idx);
2085 struct iwl_tso_hdr_page *get_page_hdr(struct iwl_trans *trans, size_t len)
2087 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
2088 struct iwl_tso_hdr_page *p = this_cpu_ptr(trans_pcie->tso_hdr_page);
2093 /* enough room on this page */
2094 if (p->pos + len < (u8 *)page_address(p->page) + PAGE_SIZE)
2097 /* We don't have enough room on this page, get a new one. */
2098 __free_page(p->page);
2101 p->page = alloc_page(GFP_ATOMIC);
2104 p->pos = page_address(p->page);
2108 static void iwl_compute_pseudo_hdr_csum(void *iph, struct tcphdr *tcph,
2109 bool ipv6, unsigned int len)
2112 struct ipv6hdr *iphv6 = iph;
2114 tcph->check = ~csum_ipv6_magic(&iphv6->saddr, &iphv6->daddr,
2115 len + tcph->doff * 4,
2118 struct iphdr *iphv4 = iph;
2120 ip_send_check(iphv4);
2121 tcph->check = ~csum_tcpudp_magic(iphv4->saddr, iphv4->daddr,
2122 len + tcph->doff * 4,
2127 static int iwl_fill_data_tbs_amsdu(struct iwl_trans *trans, struct sk_buff *skb,
2128 struct iwl_txq *txq, u8 hdr_len,
2129 struct iwl_cmd_meta *out_meta,
2130 struct iwl_device_cmd *dev_cmd, u16 tb1_len)
2132 struct iwl_tx_cmd *tx_cmd = (void *)dev_cmd->payload;
2133 struct iwl_trans_pcie *trans_pcie = txq->trans_pcie;
2134 struct ieee80211_hdr *hdr = (void *)skb->data;
2135 unsigned int snap_ip_tcp_hdrlen, ip_hdrlen, total_len, hdr_room;
2136 unsigned int mss = skb_shinfo(skb)->gso_size;
2137 u16 length, iv_len, amsdu_pad;
2139 struct iwl_tso_hdr_page *hdr_page;
2140 struct page **page_ptr;
2143 /* if the packet is protected, then it must be CCMP or GCMP */
2144 BUILD_BUG_ON(IEEE80211_CCMP_HDR_LEN != IEEE80211_GCMP_HDR_LEN);
2145 iv_len = ieee80211_has_protected(hdr->frame_control) ?
2146 IEEE80211_CCMP_HDR_LEN : 0;
2148 trace_iwlwifi_dev_tx(trans->dev, skb,
2149 iwl_pcie_get_tfd(trans, txq, txq->write_ptr),
2150 trans_pcie->tfd_size,
2151 &dev_cmd->hdr, IWL_FIRST_TB_SIZE + tb1_len, 0);
2153 ip_hdrlen = skb_transport_header(skb) - skb_network_header(skb);
2154 snap_ip_tcp_hdrlen = 8 + ip_hdrlen + tcp_hdrlen(skb);
2155 total_len = skb->len - snap_ip_tcp_hdrlen - hdr_len - iv_len;
2158 /* total amount of header we may need for this A-MSDU */
2159 hdr_room = DIV_ROUND_UP(total_len, mss) *
2160 (3 + snap_ip_tcp_hdrlen + sizeof(struct ethhdr)) + iv_len;
2162 /* Our device supports 9 segments at most, it will fit in 1 page */
2163 hdr_page = get_page_hdr(trans, hdr_room);
2167 get_page(hdr_page->page);
2168 start_hdr = hdr_page->pos;
2169 page_ptr = (void *)((u8 *)skb->cb + trans_pcie->page_offs);
2170 *page_ptr = hdr_page->page;
2171 memcpy(hdr_page->pos, skb->data + hdr_len, iv_len);
2172 hdr_page->pos += iv_len;
2175 * Pull the ieee80211 header + IV to be able to use TSO core,
2176 * we will restore it for the tx_status flow.
2178 skb_pull(skb, hdr_len + iv_len);
2181 * Remove the length of all the headers that we don't actually
2182 * have in the MPDU by themselves, but that we duplicate into
2183 * all the different MSDUs inside the A-MSDU.
2185 le16_add_cpu(&tx_cmd->len, -snap_ip_tcp_hdrlen);
2187 tso_start(skb, &tso);
2190 /* this is the data left for this subframe */
2191 unsigned int data_left =
2192 min_t(unsigned int, mss, total_len);
2193 struct sk_buff *csum_skb = NULL;
2194 unsigned int hdr_tb_len;
2195 dma_addr_t hdr_tb_phys;
2196 struct tcphdr *tcph;
2197 u8 *iph, *subf_hdrs_start = hdr_page->pos;
2199 total_len -= data_left;
2201 memset(hdr_page->pos, 0, amsdu_pad);
2202 hdr_page->pos += amsdu_pad;
2203 amsdu_pad = (4 - (sizeof(struct ethhdr) + snap_ip_tcp_hdrlen +
2205 ether_addr_copy(hdr_page->pos, ieee80211_get_DA(hdr));
2206 hdr_page->pos += ETH_ALEN;
2207 ether_addr_copy(hdr_page->pos, ieee80211_get_SA(hdr));
2208 hdr_page->pos += ETH_ALEN;
2210 length = snap_ip_tcp_hdrlen + data_left;
2211 *((__be16 *)hdr_page->pos) = cpu_to_be16(length);
2212 hdr_page->pos += sizeof(length);
2215 * This will copy the SNAP as well which will be considered
2218 tso_build_hdr(skb, hdr_page->pos, &tso, data_left, !total_len);
2219 iph = hdr_page->pos + 8;
2220 tcph = (void *)(iph + ip_hdrlen);
2222 /* For testing on current hardware only */
2223 if (trans_pcie->sw_csum_tx) {
2224 csum_skb = alloc_skb(data_left + tcp_hdrlen(skb),
2229 iwl_compute_pseudo_hdr_csum(iph, tcph,
2234 skb_put_data(csum_skb, tcph, tcp_hdrlen(skb));
2235 skb_reset_transport_header(csum_skb);
2236 csum_skb->csum_start =
2237 (unsigned char *)tcp_hdr(csum_skb) -
2241 hdr_page->pos += snap_ip_tcp_hdrlen;
2243 hdr_tb_len = hdr_page->pos - start_hdr;
2244 hdr_tb_phys = dma_map_single(trans->dev, start_hdr,
2245 hdr_tb_len, DMA_TO_DEVICE);
2246 if (unlikely(dma_mapping_error(trans->dev, hdr_tb_phys))) {
2247 dev_kfree_skb(csum_skb);
2250 iwl_pcie_txq_build_tfd(trans, txq, hdr_tb_phys,
2252 trace_iwlwifi_dev_tx_tb(trans->dev, skb, start_hdr,
2254 /* add this subframe's headers' length to the tx_cmd */
2255 le16_add_cpu(&tx_cmd->len, hdr_page->pos - subf_hdrs_start);
2257 /* prepare the start_hdr for the next subframe */
2258 start_hdr = hdr_page->pos;
2260 /* put the payload */
2262 unsigned int size = min_t(unsigned int, tso.size,
2266 if (trans_pcie->sw_csum_tx)
2267 skb_put_data(csum_skb, tso.data, size);
2269 tb_phys = dma_map_single(trans->dev, tso.data,
2270 size, DMA_TO_DEVICE);
2271 if (unlikely(dma_mapping_error(trans->dev, tb_phys))) {
2272 dev_kfree_skb(csum_skb);
2276 iwl_pcie_txq_build_tfd(trans, txq, tb_phys,
2278 trace_iwlwifi_dev_tx_tb(trans->dev, skb, tso.data,
2282 tso_build_data(skb, &tso, size);
2285 /* For testing on early hardware only */
2286 if (trans_pcie->sw_csum_tx) {
2289 csum = skb_checksum(csum_skb,
2290 skb_checksum_start_offset(csum_skb),
2292 skb_checksum_start_offset(csum_skb),
2294 dev_kfree_skb(csum_skb);
2295 dma_sync_single_for_cpu(trans->dev, hdr_tb_phys,
2296 hdr_tb_len, DMA_TO_DEVICE);
2297 tcph->check = csum_fold(csum);
2298 dma_sync_single_for_device(trans->dev, hdr_tb_phys,
2299 hdr_tb_len, DMA_TO_DEVICE);
2303 /* re -add the WiFi header and IV */
2304 skb_push(skb, hdr_len + iv_len);
2308 #else /* CONFIG_INET */
2309 static int iwl_fill_data_tbs_amsdu(struct iwl_trans *trans, struct sk_buff *skb,
2310 struct iwl_txq *txq, u8 hdr_len,
2311 struct iwl_cmd_meta *out_meta,
2312 struct iwl_device_cmd *dev_cmd, u16 tb1_len)
2314 /* No A-MSDU without CONFIG_INET */
2319 #endif /* CONFIG_INET */
2321 int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb,
2322 struct iwl_device_cmd *dev_cmd, int txq_id)
2324 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
2325 struct ieee80211_hdr *hdr;
2326 struct iwl_tx_cmd *tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
2327 struct iwl_cmd_meta *out_meta;
2328 struct iwl_txq *txq;
2329 dma_addr_t tb0_phys, tb1_phys, scratch_phys;
2333 bool wait_write_ptr;
2339 txq = trans_pcie->txq[txq_id];
2341 if (WARN_ONCE(!test_bit(txq_id, trans_pcie->queue_used),
2342 "TX on unused queue %d\n", txq_id))
2345 if (unlikely(trans_pcie->sw_csum_tx &&
2346 skb->ip_summed == CHECKSUM_PARTIAL)) {
2347 int offs = skb_checksum_start_offset(skb);
2348 int csum_offs = offs + skb->csum_offset;
2351 if (skb_ensure_writable(skb, csum_offs + sizeof(__sum16)))
2354 csum = skb_checksum(skb, offs, skb->len - offs, 0);
2355 *(__sum16 *)(skb->data + csum_offs) = csum_fold(csum);
2357 skb->ip_summed = CHECKSUM_UNNECESSARY;
2360 if (skb_is_nonlinear(skb) &&
2361 skb_shinfo(skb)->nr_frags > IWL_PCIE_MAX_FRAGS(trans_pcie) &&
2362 __skb_linearize(skb))
2365 /* mac80211 always puts the full header into the SKB's head,
2366 * so there's no need to check if it's readable there
2368 hdr = (struct ieee80211_hdr *)skb->data;
2369 fc = hdr->frame_control;
2370 hdr_len = ieee80211_hdrlen(fc);
2372 spin_lock(&txq->lock);
2374 if (iwl_queue_space(trans, txq) < txq->high_mark) {
2375 iwl_stop_queue(trans, txq);
2377 /* don't put the packet on the ring, if there is no room */
2378 if (unlikely(iwl_queue_space(trans, txq) < 3)) {
2379 struct iwl_device_cmd **dev_cmd_ptr;
2381 dev_cmd_ptr = (void *)((u8 *)skb->cb +
2382 trans_pcie->dev_cmd_offs);
2384 *dev_cmd_ptr = dev_cmd;
2385 __skb_queue_tail(&txq->overflow_q, skb);
2387 spin_unlock(&txq->lock);
2392 /* In AGG mode, the index in the ring must correspond to the WiFi
2393 * sequence number. This is a HW requirements to help the SCD to parse
2395 * Check here that the packets are in the right place on the ring.
2397 wifi_seq = IEEE80211_SEQ_TO_SN(le16_to_cpu(hdr->seq_ctrl));
2398 WARN_ONCE(txq->ampdu &&
2399 (wifi_seq & 0xff) != txq->write_ptr,
2400 "Q: %d WiFi Seq %d tfdNum %d",
2401 txq_id, wifi_seq, txq->write_ptr);
2403 /* Set up driver data for this TFD */
2404 txq->entries[txq->write_ptr].skb = skb;
2405 txq->entries[txq->write_ptr].cmd = dev_cmd;
2407 dev_cmd->hdr.sequence =
2408 cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
2409 INDEX_TO_SEQ(txq->write_ptr)));
2411 tb0_phys = iwl_pcie_get_first_tb_dma(txq, txq->write_ptr);
2412 scratch_phys = tb0_phys + sizeof(struct iwl_cmd_header) +
2413 offsetof(struct iwl_tx_cmd, scratch);
2415 tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys);
2416 tx_cmd->dram_msb_ptr = iwl_get_dma_hi_addr(scratch_phys);
2418 /* Set up first empty entry in queue's array of Tx/cmd buffers */
2419 out_meta = &txq->entries[txq->write_ptr].meta;
2420 out_meta->flags = 0;
2423 * The second TB (tb1) points to the remainder of the TX command
2424 * and the 802.11 header - dword aligned size
2425 * (This calculation modifies the TX command, so do it before the
2426 * setup of the first TB)
2428 len = sizeof(struct iwl_tx_cmd) + sizeof(struct iwl_cmd_header) +
2429 hdr_len - IWL_FIRST_TB_SIZE;
2430 /* do not align A-MSDU to dword as the subframe header aligns it */
2431 amsdu = ieee80211_is_data_qos(fc) &&
2432 (*ieee80211_get_qos_ctl(hdr) &
2433 IEEE80211_QOS_CTL_A_MSDU_PRESENT);
2434 if (trans_pcie->sw_csum_tx || !amsdu) {
2435 tb1_len = ALIGN(len, 4);
2436 /* Tell NIC about any 2-byte padding after MAC header */
2438 tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_MH_PAD);
2444 * The first TB points to bi-directional DMA data, we'll
2445 * memcpy the data into it later.
2447 iwl_pcie_txq_build_tfd(trans, txq, tb0_phys,
2448 IWL_FIRST_TB_SIZE, true);
2450 /* there must be data left over for TB1 or this code must be changed */
2451 BUILD_BUG_ON(sizeof(struct iwl_tx_cmd) < IWL_FIRST_TB_SIZE);
2453 /* map the data for TB1 */
2454 tb1_addr = ((u8 *)&dev_cmd->hdr) + IWL_FIRST_TB_SIZE;
2455 tb1_phys = dma_map_single(trans->dev, tb1_addr, tb1_len, DMA_TO_DEVICE);
2456 if (unlikely(dma_mapping_error(trans->dev, tb1_phys)))
2458 iwl_pcie_txq_build_tfd(trans, txq, tb1_phys, tb1_len, false);
2460 trace_iwlwifi_dev_tx(trans->dev, skb,
2461 iwl_pcie_get_tfd(trans, txq,
2463 trans_pcie->tfd_size,
2464 &dev_cmd->hdr, IWL_FIRST_TB_SIZE + tb1_len,
2468 * If gso_size wasn't set, don't give the frame "amsdu treatment"
2469 * (adding subframes, etc.).
2470 * This can happen in some testing flows when the amsdu was already
2471 * pre-built, and we just need to send the resulting skb.
2473 if (amsdu && skb_shinfo(skb)->gso_size) {
2474 if (unlikely(iwl_fill_data_tbs_amsdu(trans, skb, txq, hdr_len,
2479 struct sk_buff *frag;
2481 if (unlikely(iwl_fill_data_tbs(trans, skb, txq, hdr_len,
2485 skb_walk_frags(skb, frag) {
2486 if (unlikely(iwl_fill_data_tbs(trans, frag, txq, 0,
2492 /* building the A-MSDU might have changed this data, so memcpy it now */
2493 memcpy(&txq->first_tb_bufs[txq->write_ptr], dev_cmd, IWL_FIRST_TB_SIZE);
2495 tfd = iwl_pcie_get_tfd(trans, txq, txq->write_ptr);
2496 /* Set up entry for this TFD in Tx byte-count array */
2497 iwl_pcie_txq_update_byte_cnt_tbl(trans, txq, le16_to_cpu(tx_cmd->len),
2498 iwl_pcie_tfd_get_num_tbs(trans, tfd));
2500 wait_write_ptr = ieee80211_has_morefrags(fc);
2502 /* start timer if queue currently empty */
2503 if (txq->read_ptr == txq->write_ptr) {
2504 if (txq->wd_timeout) {
2506 * If the TXQ is active, then set the timer, if not,
2507 * set the timer in remainder so that the timer will
2508 * be armed with the right value when the station will
2512 mod_timer(&txq->stuck_timer,
2513 jiffies + txq->wd_timeout);
2515 txq->frozen_expiry_remainder = txq->wd_timeout;
2517 IWL_DEBUG_RPM(trans, "Q: %d first tx - take ref\n", txq->id);
2518 iwl_trans_ref(trans);
2521 /* Tell device the write index *just past* this latest filled TFD */
2522 txq->write_ptr = iwl_queue_inc_wrap(trans, txq->write_ptr);
2523 if (!wait_write_ptr)
2524 iwl_pcie_txq_inc_wr_ptr(trans, txq);
2527 * At this point the frame is "transmitted" successfully
2528 * and we will get a TX status notification eventually.
2530 spin_unlock(&txq->lock);
2533 iwl_pcie_tfd_unmap(trans, out_meta, txq, txq->write_ptr);
2534 spin_unlock(&txq->lock);