iwlwifi: move queue mapping out of transport

The queue mapping is not only dynamic, it
is also dependent on the uCode, as we can
already see today with the dual-mode and
non-dual-mode being different.

Move the queue mapping out of the transport
layer and let the higher layer manage it.
Part of the transport configuration is how
to set up the queues.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 34 insertions, 184 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c b/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
index 98cd71fb385e..0a2337253532 100644
--- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
+++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
@@ -369,21 +369,13 @@ error:
 }
 
 static int iwl_trans_txq_init(struct iwl_trans *trans, struct iwl_tx_queue *txq,
-		      int slots_num, u32 txq_id)
+			      int slots_num, u32 txq_id)
 {
 	int ret;
 
 	txq->need_update = 0;
 	memset(txq->meta, 0, sizeof(txq->meta[0]) * slots_num);
 
-	/*
-	 * For the default queues 0-3, set up the swq_id
-	 * already -- all others need to get one later
-	 * (if they need one at all).
-	 */
-	if (txq_id < 4)
-		iwl_set_swq_id(txq, txq_id, txq_id);
-
 	/* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
 	 * iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */
 	BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
@@ -894,59 +886,6 @@ static int iwl_prepare_card_hw(struct iwl_trans *trans)
 	return ret;
 }
 
-#define IWL_AC_UNSET -1
-
-struct queue_to_fifo_ac {
-	s8 fifo, ac;
-};
-
-static const struct queue_to_fifo_ac iwlagn_default_queue_to_tx_fifo[] = {
-	{ IWL_TX_FIFO_VO, IEEE80211_AC_VO, },
-	{ IWL_TX_FIFO_VI, IEEE80211_AC_VI, },
-	{ IWL_TX_FIFO_BE, IEEE80211_AC_BE, },
-	{ IWL_TX_FIFO_BK, IEEE80211_AC_BK, },
-	{ IWLAGN_CMD_FIFO_NUM, IWL_AC_UNSET, },
-	{ IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
-	{ IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
-	{ IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
-	{ IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
-	{ IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
-	{ IWL_TX_FIFO_UNUSED, IWL_AC_UNSET, },
-};
-
-static const struct queue_to_fifo_ac iwlagn_ipan_queue_to_tx_fifo[] = {
-	{ IWL_TX_FIFO_VO, IEEE80211_AC_VO, },
-	{ IWL_TX_FIFO_VI, IEEE80211_AC_VI, },
-	{ IWL_TX_FIFO_BE, IEEE80211_AC_BE, },
-	{ IWL_TX_FIFO_BK, IEEE80211_AC_BK, },
-	{ IWL_TX_FIFO_BK_IPAN, IEEE80211_AC_BK, },
-	{ IWL_TX_FIFO_BE_IPAN, IEEE80211_AC_BE, },
-	{ IWL_TX_FIFO_VI_IPAN, IEEE80211_AC_VI, },
-	{ IWL_TX_FIFO_VO_IPAN, IEEE80211_AC_VO, },
-	{ IWL_TX_FIFO_BE_IPAN, 2, },
-	{ IWLAGN_CMD_FIFO_NUM, IWL_AC_UNSET, },
-	{ IWL_TX_FIFO_AUX, IWL_AC_UNSET, },
-};
-
-static const u8 iwlagn_bss_ac_to_fifo[] = {
-	IWL_TX_FIFO_VO,
-	IWL_TX_FIFO_VI,
-	IWL_TX_FIFO_BE,
-	IWL_TX_FIFO_BK,
-};
-static const u8 iwlagn_bss_ac_to_queue[] = {
-	0, 1, 2, 3,
-};
-static const u8 iwlagn_pan_ac_to_fifo[] = {
-	IWL_TX_FIFO_VO_IPAN,
-	IWL_TX_FIFO_VI_IPAN,
-	IWL_TX_FIFO_BE_IPAN,
-	IWL_TX_FIFO_BK_IPAN,
-};
-static const u8 iwlagn_pan_ac_to_queue[] = {
-	7, 6, 5, 4,
-};
-
 /*
  * ucode
  */
@@ -1027,19 +966,8 @@ static int iwl_trans_pcie_start_fw(struct iwl_trans *trans,
 				   const struct fw_img *fw)
 {
 	int ret;
-	struct iwl_trans_pcie *trans_pcie =
-		IWL_TRANS_GET_PCIE_TRANS(trans);
 	bool hw_rfkill;
 
-	trans_pcie->ac_to_queue[IWL_RXON_CTX_BSS] = iwlagn_bss_ac_to_queue;
-	trans_pcie->ac_to_queue[IWL_RXON_CTX_PAN] = iwlagn_pan_ac_to_queue;
-
-	trans_pcie->ac_to_fifo[IWL_RXON_CTX_BSS] = iwlagn_bss_ac_to_fifo;
-	trans_pcie->ac_to_fifo[IWL_RXON_CTX_PAN] = iwlagn_pan_ac_to_fifo;
-
-	trans_pcie->mcast_queue[IWL_RXON_CTX_BSS] = 0;
-	trans_pcie->mcast_queue[IWL_RXON_CTX_PAN] = IWL_IPAN_MCAST_QUEUE;
-
 	/* This may fail if AMT took ownership of the device */
 	if (iwl_prepare_card_hw(trans)) {
 		IWL_WARN(trans, "Exit HW not ready\n");
@@ -1097,9 +1025,7 @@ static void iwl_trans_txq_set_sched(struct iwl_trans *trans, u32 mask)
 
 static void iwl_tx_start(struct iwl_trans *trans)
 {
-	const struct queue_to_fifo_ac *queue_to_fifo;
-	struct iwl_trans_pcie *trans_pcie =
-		IWL_TRANS_GET_PCIE_TRANS(trans);
+	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 	u32 a;
 	unsigned long flags;
 	int i, chan;
@@ -1165,41 +1091,19 @@ static void iwl_tx_start(struct iwl_trans *trans)
 	/* Activate all Tx DMA/FIFO channels */
 	iwl_trans_txq_set_sched(trans, IWL_MASK(0, 7));
 
-	/* map queues to FIFOs */
-	if (trans->shrd->valid_contexts != BIT(IWL_RXON_CTX_BSS))
-		queue_to_fifo = iwlagn_ipan_queue_to_tx_fifo;
-	else
-		queue_to_fifo = iwlagn_default_queue_to_tx_fifo;
-
 	iwl_trans_set_wr_ptrs(trans, trans_pcie->cmd_queue, 0);
 
-	/* make sure all queue are not stopped */
-	memset(&trans_pcie->queue_stopped[0], 0,
-		sizeof(trans_pcie->queue_stopped));
-	for (i = 0; i < 4; i++)
-		atomic_set(&trans_pcie->queue_stop_count[i], 0);
-
-	/* reset to 0 to enable all the queue first */
-	trans_pcie->txq_ctx_active_msk = 0;
+	/* make sure all queue are not stopped/used */
+	memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped));
+	memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used));
 
-	BUILD_BUG_ON(ARRAY_SIZE(iwlagn_default_queue_to_tx_fifo) <
-						IWLAGN_FIRST_AMPDU_QUEUE);
-	BUILD_BUG_ON(ARRAY_SIZE(iwlagn_ipan_queue_to_tx_fifo) <
-						IWLAGN_FIRST_AMPDU_QUEUE);
+	for (i = 0; i < trans_pcie->n_q_to_fifo; i++) {
+		int fifo = trans_pcie->setup_q_to_fifo[i];
 
-	for (i = 0; i < IWLAGN_FIRST_AMPDU_QUEUE; i++) {
-		int fifo = queue_to_fifo[i].fifo;
-		int ac = queue_to_fifo[i].ac;
+		set_bit(i, trans_pcie->queue_used);
 
-		iwl_txq_ctx_activate(trans_pcie, i);
-
-		if (fifo == IWL_TX_FIFO_UNUSED)
-			continue;
-
-		if (ac != IWL_AC_UNSET)
-			iwl_set_swq_id(&trans_pcie->txq[i], ac, i);
 		iwl_trans_tx_queue_set_status(trans, &trans_pcie->txq[i],
-					      fifo, 0);
+					      fifo, true);
 	}
 
 	spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
@@ -1324,70 +1228,32 @@ static void iwl_trans_pcie_wowlan_suspend(struct iwl_trans *trans)
 }
 
 static int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb,
-		struct iwl_device_cmd *dev_cmd, enum iwl_rxon_context_id ctx,
-		u8 sta_id, u8 tid)
+			     struct iwl_device_cmd *dev_cmd, int txq_id)
 {
 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
-	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 	struct iwl_tx_cmd *tx_cmd = (struct iwl_tx_cmd *) dev_cmd->payload;
 	struct iwl_cmd_meta *out_meta;
 	struct iwl_tx_queue *txq;
 	struct iwl_queue *q;
-
 	dma_addr_t phys_addr = 0;
 	dma_addr_t txcmd_phys;
 	dma_addr_t scratch_phys;
 	u16 len, firstlen, secondlen;
 	u8 wait_write_ptr = 0;
-	u8 txq_id;
-	bool is_agg = false;
 	__le16 fc = hdr->frame_control;
 	u8 hdr_len = ieee80211_hdrlen(fc);
 	u16 __maybe_unused wifi_seq;
 
-	/*
-	 * Send this frame after DTIM -- there's a special queue
-	 * reserved for this for contexts that support AP mode.
-	 */
-	if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
-		txq_id = trans_pcie->mcast_queue[ctx];
-
-		/*
-		 * The microcode will clear the more data
-		 * bit in the last frame it transmits.
-		 */
-		hdr->frame_control |=
-			cpu_to_le16(IEEE80211_FCTL_MOREDATA);
-	} else if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)
-		txq_id = IWL_AUX_QUEUE;
-	else
-		txq_id =
-		    trans_pcie->ac_to_queue[ctx][skb_get_queue_mapping(skb)];
-
-	/* aggregation is on for this <sta,tid> */
-	if (info->flags & IEEE80211_TX_CTL_AMPDU) {
-		WARN_ON(tid >= IWL_MAX_TID_COUNT);
-		txq_id = trans_pcie->agg_txq[sta_id][tid];
-		is_agg = true;
-	}
-
 	txq = &trans_pcie->txq[txq_id];
 	q = &txq->q;
 
-	spin_lock(&txq->lock);
+	if (unlikely(!test_bit(txq_id, trans_pcie->queue_used))) {
+		WARN_ON_ONCE(1);
+		return -EINVAL;
+	}
 
-	/* In AGG mode, the index in the ring must correspond to the WiFi
-	 * sequence number. This is a HW requirements to help the SCD to parse
-	 * the BA.
-	 * Check here that the packets are in the right place on the ring.
-	 */
-#ifdef CONFIG_IWLWIFI_DEBUG
-	wifi_seq = SEQ_TO_SN(le16_to_cpu(hdr->seq_ctrl));
-	WARN_ONCE(is_agg && ((wifi_seq & 0xff) != q->write_ptr),
-		  "Q: %d WiFi Seq %d tfdNum %d",
-		  txq_id, wifi_seq, q->write_ptr);
-#endif
+	spin_lock(&txq->lock);
 
 	/* Set up driver data for this TFD */
 	txq->skbs[q->write_ptr] = skb;
@@ -1564,8 +1430,8 @@ static void iwl_trans_pcie_stop_hw(struct iwl_trans *trans)
 	iwl_enable_rfkill_int(trans);
 }
 
-static int iwl_trans_pcie_reclaim(struct iwl_trans *trans, int sta_id, int tid,
-		      int txq_id, int ssn, struct sk_buff_head *skbs)
+static void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn,
+				   struct sk_buff_head *skbs)
 {
 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 	struct iwl_tx_queue *txq = &trans_pcie->txq[txq_id];
@@ -1577,33 +1443,15 @@ static int iwl_trans_pcie_reclaim(struct iwl_trans *trans, int sta_id, int tid,
 
 	txq->time_stamp = jiffies;
 
-	if (unlikely(txq_id >= IWLAGN_FIRST_AMPDU_QUEUE &&
-		     tid != IWL_TID_NON_QOS &&
-		     txq_id != trans_pcie->agg_txq[sta_id][tid])) {
-		/*
-		 * FIXME: this is a uCode bug which need to be addressed,
-		 * log the information and return for now.
-		 * Since it is can possibly happen very often and in order
-		 * not to fill the syslog, don't use IWL_ERR or IWL_WARN
-		 */
-		IWL_DEBUG_TX_QUEUES(trans, "Bad queue mapping txq_id %d, "
-			"agg_txq[sta_id[tid] %d", txq_id,
-			trans_pcie->agg_txq[sta_id][tid]);
-		spin_unlock(&txq->lock);
-		return 1;
-	}
-
 	if (txq->q.read_ptr != tfd_num) {
-		IWL_DEBUG_TX_REPLY(trans, "[Q %d | AC %d] %d -> %d (%d)\n",
-				txq_id, iwl_get_queue_ac(txq), txq->q.read_ptr,
-				tfd_num, ssn);
+		IWL_DEBUG_TX_REPLY(trans, "[Q %d] %d -> %d (%d)\n",
+				   txq_id, txq->q.read_ptr, tfd_num, ssn);
 		freed = iwl_tx_queue_reclaim(trans, txq_id, tfd_num, skbs);
 		if (iwl_queue_space(&txq->q) > txq->q.low_mark)
 			iwl_wake_queue(trans, txq);
 	}
 
 	spin_unlock(&txq->lock);
-	return 0;
 }
 
 static void iwl_trans_pcie_write8(struct iwl_trans *trans, u32 ofs, u8 val)
@@ -1622,7 +1470,7 @@ static u32 iwl_trans_pcie_read32(struct iwl_trans *trans, u32 ofs)
 }
 
 static void iwl_trans_pcie_configure(struct iwl_trans *trans,
-			      const struct iwl_trans_config *trans_cfg)
+				     const struct iwl_trans_config *trans_cfg)
 {
 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 
@@ -1634,6 +1482,17 @@ static void iwl_trans_pcie_configure(struct iwl_trans *trans,
 	if (trans_pcie->n_no_reclaim_cmds)
 		memcpy(trans_pcie->no_reclaim_cmds, trans_cfg->no_reclaim_cmds,
 		       trans_pcie->n_no_reclaim_cmds * sizeof(u8));
+
+	trans_pcie->n_q_to_fifo = trans_cfg->n_queue_to_fifo;
+
+	if (WARN_ON(trans_pcie->n_q_to_fifo > IWL_MAX_HW_QUEUES))
+		trans_pcie->n_q_to_fifo = IWL_MAX_HW_QUEUES;
+
+	/* at least the command queue must be mapped */
+	WARN_ON(!trans_pcie->n_q_to_fifo);
+
+	memcpy(trans_pcie->setup_q_to_fifo, trans_cfg->queue_to_fifo,
+	       trans_pcie->n_q_to_fifo * sizeof(u8));
 }
 
 static void iwl_trans_pcie_free(struct iwl_trans *trans)
@@ -1957,18 +1816,10 @@ static ssize_t iwl_dbgfs_tx_queue_read(struct file *file,
 		txq = &trans_pcie->txq[cnt];
 		q = &txq->q;
 		pos += scnprintf(buf + pos, bufsz - pos,
-				"hwq %.2d: read=%u write=%u stop=%d"
-				" swq_id=%#.2x (ac %d/hwq %d)\n",
+				"hwq %.2d: read=%u write=%u use=%d stop=%d\n",
 				cnt, q->read_ptr, q->write_ptr,
-				!!test_bit(cnt, trans_pcie->queue_stopped),
-				txq->swq_id, txq->swq_id & 3,
-				(txq->swq_id >> 2) & 0x1f);
-		if (cnt >= 4)
-			continue;
-		/* for the ACs, display the stop count too */
-		pos += scnprintf(buf + pos, bufsz - pos,
-			"        stop-count: %d\n",
-			atomic_read(&trans_pcie->queue_stop_count[cnt]));
+				!!test_bit(cnt, trans_pcie->queue_used),
+				!!test_bit(cnt, trans_pcie->queue_stopped));
 	}
 	ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);
 	kfree(buf);
@@ -2210,7 +2061,6 @@ const struct iwl_trans_ops trans_ops_pcie = {
 	.reclaim = iwl_trans_pcie_reclaim,
 
 	.tx_agg_disable = iwl_trans_pcie_tx_agg_disable,
-	.tx_agg_alloc = iwl_trans_pcie_tx_agg_alloc,
 	.tx_agg_setup = iwl_trans_pcie_tx_agg_setup,
 
 	.free = iwl_trans_pcie_free,