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Commit 68972c46 authored by Johannes Berg's avatar Johannes Berg
Browse files

iwlwifi: make TX seqno validation more efficient 



Accessing the device in Tx path is not a good idea.
Mirror the data in DRAM.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 8eb38710

drivers/net/wireless/iwlwifi/pcie/internal.h

+2 −0
Original line number Diff line number Diff line
@@ -217,6 +217,7 @@ struct iwl_pcie_txq_scratch_buf { 
 * @trans_pcie: pointer back to transport (for timer)

 * @need_update: indicates need to update read/write index

 * @active: stores if queue is active

 * @ampdu: true if this queue is an ampdu queue for an specific RA/TID

 *

 * A Tx queue consists of circular buffer of BDs (a.k.a. TFDs, transmit frame

 * descriptors) and required locking structures.
@@ -232,6 +233,7 @@ struct iwl_txq { 
	struct iwl_trans_pcie *trans_pcie;

	u8 need_update;

	u8 active;

	bool ampdu;

};



static inline dma_addr_t

drivers/net/wireless/iwlwifi/pcie/tx.c

+5 −5
Original line number Diff line number Diff line
@@ -1073,6 +1073,7 @@ void iwl_trans_pcie_txq_enable(struct iwl_trans *trans, int txq_id, int fifo, 


		/* enable aggregations for the queue */

		iwl_set_bits_prph(trans, SCD_AGGR_SEL, BIT(txq_id));

		trans_pcie->txq[txq_id].ampdu = true;

	} else {

		/*

		 * disable aggregations for the queue, this will also make the
@@ -1129,6 +1130,7 @@ void iwl_trans_pcie_txq_disable(struct iwl_trans *trans, int txq_id) 
			    ARRAY_SIZE(zero_val));



	iwl_pcie_txq_unmap(trans, txq_id);

	trans_pcie->txq[txq_id].ampdu = false;



	IWL_DEBUG_TX_QUEUES(trans, "Deactivate queue %d\n", txq_id);

}
@@ -1599,7 +1601,7 @@ int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb, 
	u8 wait_write_ptr = 0;

	__le16 fc = hdr->frame_control;

	u8 hdr_len = ieee80211_hdrlen(fc);

	u16 __maybe_unused wifi_seq;

	u16 wifi_seq;



	txq = &trans_pcie->txq[txq_id];

	q = &txq->q;
@@ -1616,13 +1618,11 @@ int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb, 
	 * the BA.

	 * Check here that the packets are in the right place on the ring.

	 */

#ifdef CONFIG_IWLWIFI_DEBUG

	wifi_seq = IEEE80211_SEQ_TO_SN(le16_to_cpu(hdr->seq_ctrl));

	WARN_ONCE((iwl_read_prph(trans, SCD_AGGR_SEL) & BIT(txq_id)) &&

		  ((wifi_seq & 0xff) != q->write_ptr),

	WARN_ONCE(trans_pcie->txq[txq_id].ampdu &&

		  (wifi_seq & 0xff) != q->write_ptr,

		  "Q: %d WiFi Seq %d tfdNum %d",

		  txq_id, wifi_seq, q->write_ptr);

#endif



	/* Set up driver data for this TFD */

	txq->entries[q->write_ptr].skb = skb;