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ath11k: add processor_id based ring_selector logic

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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: P Praneesh <ppranees@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1604914915-12831-1-git-send-email-ppranees@codeaurora.org
This commit is contained in:
P Praneesh
2020-11-09 15:11:55 +05:30
committed by Kalle Valo
parent c134d1f8c4
commit 0eaa4c1d34
2 changed files with 4 additions and 7 deletions
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3
drivers/net/wireless/ath/ath11k/core.h
View File

@@ -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;

8
drivers/net/wireless/ath/ath11k/dp_tx.c
View File

@@ -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;