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From: Rakesh Pillai <pillair@codeaurora.org>
To: ath10k@lists.infradead.org
Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
	kvalo@codeaurora.org, johannes@sipsolutions.net,
	davem@davemloft.net, kuba@kernel.org, netdev@vger.kernel.org,
	dianders@chromium.org, evgreen@chromium.org,
	Rakesh Pillai <pillair@codeaurora.org>
Subject: [RFC 4/7] ath10k: Do not exhaust budget on process tx completion
Date: Tue, 21 Jul 2020 22:44:23 +0530	[thread overview]
Message-ID: <1595351666-28193-5-git-send-email-pillair@codeaurora.org> (raw)
In-Reply-To: <1595351666-28193-1-git-send-email-pillair@codeaurora.org>

Currently the entire NAPI budget is marked as exhausted
if any tx completion is processed.
In scenarios of bi-directional traffic, this leads to a
situation where the irqs are never enabled and the NAPI
is rescheuled again and again.

Increase the work done quota by the number of tx completions
which are processed in the NAPI context.

Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.1-01040-QCAHLSWMTPLZ-1

Signed-off-by: Rakesh Pillai <pillair@codeaurora.org>
---
 drivers/net/wireless/ath/ath10k/htt_rx.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c
index cac05e7..a4a6618 100644
--- a/drivers/net/wireless/ath/ath10k/htt_rx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
@@ -4077,21 +4077,18 @@ int ath10k_htt_txrx_compl_task(struct ath10k *ar, int budget)
 	/* Deliver received data after processing data from hardware */
 	quota = ath10k_htt_rx_deliver_msdu(ar, quota, budget);
 
-	/* From NAPI documentation:
-	 *  The napi poll() function may also process TX completions, in which
-	 *  case if it processes the entire TX ring then it should count that
-	 *  work as the rest of the budget.
-	 */
-	if ((quota < budget) && !kfifo_is_empty(&htt->txdone_fifo))
-		quota = budget;
-
 	/* kfifo_get: called only within txrx_tasklet so it's neatly serialized.
 	 * From kfifo_get() documentation:
 	 *  Note that with only one concurrent reader and one concurrent writer,
 	 *  you don't need extra locking to use these macro.
 	 */
-	while (kfifo_get(&htt->txdone_fifo, &tx_done))
+	while (kfifo_get(&htt->txdone_fifo, &tx_done)) {
 		ath10k_txrx_tx_unref(htt, &tx_done);
+		quota++;
+	}
+
+	if (quota > budget)
+		resched_napi = true;
 
 	ath10k_mac_tx_push_pending(ar);
 
-- 
2.7.4


WARNING: multiple messages have this Message-ID
From: Rakesh Pillai <pillair@codeaurora.org>
To: ath10k@lists.infradead.org
Cc: netdev@vger.kernel.org, linux-wireless@vger.kernel.org,
	linux-kernel@vger.kernel.org, evgreen@chromium.org,
	dianders@chromium.org, Rakesh Pillai <pillair@codeaurora.org>,
	kuba@kernel.org, johannes@sipsolutions.net, davem@davemloft.net,
	kvalo@codeaurora.org
Subject: [RFC 4/7] ath10k: Do not exhaust budget on process tx completion
Date: Tue, 21 Jul 2020 22:44:23 +0530	[thread overview]
Message-ID: <1595351666-28193-5-git-send-email-pillair@codeaurora.org> (raw)
In-Reply-To: <1595351666-28193-1-git-send-email-pillair@codeaurora.org>

Currently the entire NAPI budget is marked as exhausted
if any tx completion is processed.
In scenarios of bi-directional traffic, this leads to a
situation where the irqs are never enabled and the NAPI
is rescheuled again and again.

Increase the work done quota by the number of tx completions
which are processed in the NAPI context.

Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.1-01040-QCAHLSWMTPLZ-1

Signed-off-by: Rakesh Pillai <pillair@codeaurora.org>
---
 drivers/net/wireless/ath/ath10k/htt_rx.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c
index cac05e7..a4a6618 100644
--- a/drivers/net/wireless/ath/ath10k/htt_rx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
@@ -4077,21 +4077,18 @@ int ath10k_htt_txrx_compl_task(struct ath10k *ar, int budget)
 	/* Deliver received data after processing data from hardware */
 	quota = ath10k_htt_rx_deliver_msdu(ar, quota, budget);
 
-	/* From NAPI documentation:
-	 *  The napi poll() function may also process TX completions, in which
-	 *  case if it processes the entire TX ring then it should count that
-	 *  work as the rest of the budget.
-	 */
-	if ((quota < budget) && !kfifo_is_empty(&htt->txdone_fifo))
-		quota = budget;
-
 	/* kfifo_get: called only within txrx_tasklet so it's neatly serialized.
 	 * From kfifo_get() documentation:
 	 *  Note that with only one concurrent reader and one concurrent writer,
 	 *  you don't need extra locking to use these macro.
 	 */
-	while (kfifo_get(&htt->txdone_fifo, &tx_done))
+	while (kfifo_get(&htt->txdone_fifo, &tx_done)) {
 		ath10k_txrx_tx_unref(htt, &tx_done);
+		quota++;
+	}
+
+	if (quota > budget)
+		resched_napi = true;
 
 	ath10k_mac_tx_push_pending(ar);
 
-- 
2.7.4


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ath10k@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/ath10k

  parent reply	other threads:[~2020-07-21 17:15 UTC|newest]

Thread overview: 96+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-21 17:14 [RFC 0/7] Add support to process rx packets in thread Rakesh Pillai
2020-07-21 17:14 ` Rakesh Pillai
2020-07-21 17:14 ` [RFC 1/7] mac80211: Add check for napi handle before WARN_ON Rakesh Pillai
2020-07-21 17:14   ` Rakesh Pillai
2020-07-22 12:56   ` Johannes Berg
2020-07-22 12:56     ` Johannes Berg
2020-07-23 18:26     ` Rakesh Pillai
2020-07-23 18:26       ` Rakesh Pillai
2020-07-23 20:06       ` Johannes Berg
2020-07-23 20:06         ` Johannes Berg
2020-07-24  6:21         ` Rakesh Pillai
2020-07-24  6:21           ` Rakesh Pillai
2020-07-26 16:19         ` Rakesh Pillai
2020-07-26 16:19           ` Rakesh Pillai
2020-07-30 12:40           ` Johannes Berg
2020-07-30 12:40             ` Johannes Berg
2020-07-21 17:14 ` [RFC 2/7] ath10k: Add support to process rx packet in thread Rakesh Pillai
2020-07-21 17:14   ` Rakesh Pillai
2020-07-21 21:53   ` Rajkumar Manoharan
2020-07-21 21:53     ` Rajkumar Manoharan
2020-07-22 12:27     ` Felix Fietkau
2020-07-22 12:27       ` Felix Fietkau
2020-07-22 12:55       ` Johannes Berg
2020-07-22 12:55         ` Johannes Berg
2020-07-22 13:00         ` Felix Fietkau
2020-07-22 13:00           ` Felix Fietkau
2020-07-23  6:09           ` Rajkumar Manoharan
2020-07-23  6:09             ` Rajkumar Manoharan
2021-03-22 23:57           ` Ben Greear
2021-03-22 23:57             ` Ben Greear
2021-03-23  1:20             ` Brian Norris
2021-03-23  1:20               ` Brian Norris
2021-03-23  3:01               ` Ben Greear
2021-03-23  3:01                 ` Ben Greear
2021-03-23  7:45                 ` Felix Fietkau
2021-03-23  7:45                   ` Felix Fietkau
2021-03-25  9:45                   ` Rakesh Pillai
2021-03-25  9:45                     ` Rakesh Pillai
2021-03-25 10:33                     ` Felix Fietkau
2021-03-25 10:33                       ` Felix Fietkau
2020-07-23 18:25     ` Rakesh Pillai
2020-07-23 18:25       ` Rakesh Pillai
2020-07-24 23:11       ` Jacob Keller
2020-07-24 23:11         ` Jacob Keller
2020-07-21 17:14 ` [RFC 3/7] ath10k: Add module param to enable rx thread Rakesh Pillai
2020-07-21 17:14   ` Rakesh Pillai
2020-07-21 17:14 ` Rakesh Pillai [this message]
2020-07-21 17:14   ` [RFC 4/7] ath10k: Do not exhaust budget on process tx completion Rakesh Pillai
2020-07-21 17:14 ` [RFC 5/7] ath10k: Handle the rx packet processing in thread Rakesh Pillai
2020-07-21 17:14   ` Rakesh Pillai
2020-07-21 17:14 ` [RFC 6/7] ath10k: Add deliver to stack from thread context Rakesh Pillai
2020-07-21 17:14   ` Rakesh Pillai
2020-07-21 17:14 ` [RFC 7/7] ath10k: Handle rx thread suspend and resume Rakesh Pillai
2020-07-21 17:14   ` Rakesh Pillai
2020-07-23 23:06   ` Sebastian Gottschall
2020-07-23 23:06     ` Sebastian Gottschall
2020-07-24  6:19     ` Rakesh Pillai
2020-07-24  6:19       ` Rakesh Pillai
2020-07-21 17:25 ` [RFC 0/7] Add support to process rx packets in thread Andrew Lunn
2020-07-21 17:25   ` Andrew Lunn
2020-07-21 18:05   ` Florian Fainelli
2020-07-21 18:05     ` Florian Fainelli
2020-07-23 18:21     ` Rakesh Pillai
2020-07-23 18:21       ` Rakesh Pillai
2020-07-23 19:02       ` Florian Fainelli
2020-07-23 19:02         ` Florian Fainelli
2020-07-24  6:20         ` Rakesh Pillai
2020-07-24  6:20           ` Rakesh Pillai
2020-07-24 22:28           ` Florian Fainelli
2020-07-24 22:28             ` Florian Fainelli
2020-07-22  9:12   ` David Laight
2020-07-22  9:12     ` David Laight
2020-07-25  8:16     ` Hillf Danton
2020-07-25 10:38       ` Sebastian Gottschall
2020-07-25 10:38         ` Sebastian Gottschall
2020-07-25 12:25         ` Hillf Danton
2020-07-25 14:08         ` Sebastian Gottschall
2020-07-25 14:08           ` Sebastian Gottschall
2020-07-25 14:57           ` Hillf Danton
2020-07-25 15:41             ` Sebastian Gottschall
2020-07-25 15:41               ` Sebastian Gottschall
2020-07-26 11:16               ` David Laight
2020-07-26 11:16                 ` David Laight
2020-07-28 16:59                 ` Rakesh Pillai
2020-07-28 16:59                   ` Rakesh Pillai
2020-07-29  1:34                   ` Hillf Danton
2020-07-25 17:57       ` Felix Fietkau
2020-07-25 17:57         ` Felix Fietkau
2020-07-26  1:22         ` Hillf Danton
2020-07-26  8:10           ` Felix Fietkau
2020-07-26  8:10             ` Felix Fietkau
2020-07-26  8:32             ` Hillf Danton
2020-07-26  8:59               ` Felix Fietkau
2020-07-26  8:59                 ` Felix Fietkau
2020-07-22 16:20   ` Jakub Kicinski
2020-07-22 16:20     ` Jakub Kicinski

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