Commit 0eaa4c1d authored by P Praneesh's avatar P Praneesh Committed by Kalle Valo
Browse files

ath11k: add processor_id based ring_selector logic 



Current ring selector logic follows round-robin scheduling,
when a process switch from one processor to another each time,
the data in the cache would have to be invalidated
and re-loaded from RAM leads to poor cache utilization.

Therefore smp_processor_id() attempt to keep processes
on the same processor via processor affinity which improves
cache utilization. Also, ring selection could be chosen round
robin when the processor_id based ring selection does not
have the resources.

Tested-on : IPQ8074 hw2.0 AHB WLAN.HK.2.4.0.1-00874-QCAHKSWPL_SILICONZ-1

Signed-off-by: default avatarP Praneesh <ppranees@codeaurora.org>
Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1604914915-12831-1-git-send-email-ppranees@codeaurora.org
parent c134d1f8

drivers/net/wireless/ath/ath11k/core.h

+0 −3
Original line number Diff line number Diff line
@@ -728,9 +728,6 @@ struct ath11k_base { 
	} stats;

	u32 pktlog_defs_checksum;



	/* Round robbin based TCL ring selector */

	atomic_t tcl_ring_selector;



	struct ath11k_dbring_cap *db_caps;

	u32 num_db_cap;

drivers/net/wireless/ath/ath11k/dp_tx.c

+4 −4
Original line number Diff line number Diff line
@@ -105,14 +105,14 @@ int ath11k_dp_tx(struct ath11k *ar, struct ath11k_vif *arvif, 


	pool_id = skb_get_queue_mapping(skb) & (ATH11K_HW_MAX_QUEUES - 1);



	/* Let the default ring selection be based on a round robin

	 * fashion where one of the 3 tcl rings are selected based on

	 * the tcl_ring_selector counter. In case that ring

	/* Let the default ring selection be based on current processor

	 * number, where one of the 3 tcl rings are selected based on

	 * the smp_processor_id(). In case that ring

	 * is full/busy, we resort to other available rings.

	 * If all rings are full, we drop the packet.

	 * //TODO Add throttling logic when all rings are full

	 */

	ring_selector = atomic_inc_return(&ab->tcl_ring_selector);

	ring_selector = smp_processor_id();



tcl_ring_sel:

	tcl_ring_retry = false;