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From: Michal Krawczyk <mk@semihalf.com>
To: dev@dpdk.org
Cc: gtzalik@amazon.com, igorch@amazon.com,
	Michal Krawczyk <mk@semihalf.com>,
	Marcin Wojtas <mw@semihalf.com>,
	Evgeny Schemeilin <evgenys@amazon.com>
Subject: [dpdk-dev] [PATCH 04/20] net/ena/base: exponential delay in polling functions
Date: Thu, 17 Sep 2020 07:30:19 +0200
Message-ID: <20200917053035.1889989-5-mk@semihalf.com> (raw)
In-Reply-To: <20200917053035.1889989-1-mk@semihalf.com>

Instead of the fixes, 5 ms delay in the polling functions, use
values into given range (by default from 100 us 5000 us) and increase
them exponentially each time, the operation isn't finished.

This change can improve responsiveness of the driver for the fast
operations.

Signed-off-by: Michal Krawczyk <mk@semihalf.com>
Reviewed-by: Igor Chauskin <igorch@amazon.com>
Reviewed-by: Guy Tzalik <gtzalik@amazon.com>
---
 drivers/net/ena/base/ena_com.c       | 35 ++++++++++++++++++++--------
 drivers/net/ena/base/ena_com.h       |  3 +++
 drivers/net/ena/base/ena_plat_dpdk.h |  1 +
 3 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ena/base/ena_com.c b/drivers/net/ena/base/ena_com.c
index 0a6a92ebea..b4e54318c6 100644
--- a/drivers/net/ena/base/ena_com.c
+++ b/drivers/net/ena/base/ena_com.c
@@ -34,7 +34,9 @@
 
 #define ENA_REGS_ADMIN_INTR_MASK 1
 
-#define ENA_POLL_MS	5
+#define ENA_MIN_ADMIN_POLL_US 100
+
+#define ENA_MAX_ADMIN_POLL_US 5000
 
 /*****************************************************************************/
 /*****************************************************************************/
@@ -524,12 +526,20 @@ static int ena_com_comp_status_to_errno(u8 comp_status)
 	return ENA_COM_INVAL;
 }
 
+static void ena_delay_exponential_backoff_us(u32 exp, u32 delay_us)
+{
+	delay_us = ENA_MAX32(ENA_MIN_ADMIN_POLL_US, delay_us);
+	delay_us = ENA_MIN32(delay_us * (1U << exp), ENA_MAX_ADMIN_POLL_US);
+	ENA_USLEEP(delay_us);
+}
+
 static int ena_com_wait_and_process_admin_cq_polling(struct ena_comp_ctx *comp_ctx,
 						     struct ena_com_admin_queue *admin_queue)
 {
 	unsigned long flags = 0;
 	ena_time_t timeout;
 	int ret;
+	u32 exp = 0;
 
 	timeout = ENA_GET_SYSTEM_TIMEOUT(admin_queue->completion_timeout);
 
@@ -553,7 +563,8 @@ static int ena_com_wait_and_process_admin_cq_polling(struct ena_comp_ctx *comp_c
 			goto err;
 		}
 
-		ENA_MSLEEP(ENA_POLL_MS);
+		ena_delay_exponential_backoff_us(exp++,
+						 admin_queue->ena_dev->ena_min_poll_delay_us);
 	}
 
 	if (unlikely(comp_ctx->status == ENA_CMD_ABORTED)) {
@@ -947,12 +958,13 @@ static void ena_com_io_queue_free(struct ena_com_dev *ena_dev,
 static int wait_for_reset_state(struct ena_com_dev *ena_dev, u32 timeout,
 				u16 exp_state)
 {
-	u32 val, i;
+	u32 val, exp = 0;
+	ena_time_t timeout_stamp;
 
-	/* Convert timeout from resolution of 100ms to ENA_POLL_MS */
-	timeout = (timeout * 100) / ENA_POLL_MS;
+	/* Convert timeout from resolution of 100ms to us resolution. */
+	timeout_stamp = ENA_GET_SYSTEM_TIMEOUT(100 * 1000 * timeout);
 
-	for (i = 0; i < timeout; i++) {
+	while (1) {
 		val = ena_com_reg_bar_read32(ena_dev, ENA_REGS_DEV_STS_OFF);
 
 		if (unlikely(val == ENA_MMIO_READ_TIMEOUT)) {
@@ -964,10 +976,11 @@ static int wait_for_reset_state(struct ena_com_dev *ena_dev, u32 timeout,
 			exp_state)
 			return 0;
 
-		ENA_MSLEEP(ENA_POLL_MS);
-	}
+		if (ENA_TIME_EXPIRE(timeout_stamp))
+			return ENA_COM_TIMER_EXPIRED;
 
-	return ENA_COM_TIMER_EXPIRED;
+		ena_delay_exponential_backoff_us(exp++, ena_dev->ena_min_poll_delay_us);
+	}
 }
 
 static bool ena_com_check_supported_feature_id(struct ena_com_dev *ena_dev,
@@ -1458,11 +1471,12 @@ void ena_com_wait_for_abort_completion(struct ena_com_dev *ena_dev)
 {
 	struct ena_com_admin_queue *admin_queue = &ena_dev->admin_queue;
 	unsigned long flags = 0;
+	u32 exp = 0;
 
 	ENA_SPINLOCK_LOCK(admin_queue->q_lock, flags);
 	while (ATOMIC32_READ(&admin_queue->outstanding_cmds) != 0) {
 		ENA_SPINLOCK_UNLOCK(admin_queue->q_lock, flags);
-		ENA_MSLEEP(ENA_POLL_MS);
+		ena_delay_exponential_backoff_us(exp++, ena_dev->ena_min_poll_delay_us);
 		ENA_SPINLOCK_LOCK(admin_queue->q_lock, flags);
 	}
 	ENA_SPINLOCK_UNLOCK(admin_queue->q_lock, flags);
@@ -1827,6 +1841,7 @@ int ena_com_admin_init(struct ena_com_dev *ena_dev,
 	if (ret)
 		goto error;
 
+	admin_queue->ena_dev = ena_dev;
 	admin_queue->running_state = true;
 
 	return 0;
diff --git a/drivers/net/ena/base/ena_com.h b/drivers/net/ena/base/ena_com.h
index 61074eaf63..2acf6d8ae5 100644
--- a/drivers/net/ena/base/ena_com.h
+++ b/drivers/net/ena/base/ena_com.h
@@ -202,6 +202,7 @@ struct ena_com_stats_admin {
 struct ena_com_admin_queue {
 	void *q_dmadev;
 	void *bus;
+	struct ena_com_dev *ena_dev;
 	ena_spinlock_t q_lock; /* spinlock for the admin queue */
 
 	struct ena_comp_ctx *comp_ctx;
@@ -322,6 +323,8 @@ struct ena_com_dev {
 	struct ena_intr_moder_entry *intr_moder_tbl;
 
 	struct ena_com_llq_info llq_info;
+
+	u32 ena_min_poll_delay_us;
 };
 
 struct ena_com_dev_get_features_ctx {
diff --git a/drivers/net/ena/base/ena_plat_dpdk.h b/drivers/net/ena/base/ena_plat_dpdk.h
index d9b728c4d6..ae4fd8f868 100644
--- a/drivers/net/ena/base/ena_plat_dpdk.h
+++ b/drivers/net/ena/base/ena_plat_dpdk.h
@@ -57,6 +57,7 @@ typedef uint64_t dma_addr_t;
 #define ENA_ABORT() abort()
 
 #define ENA_MSLEEP(x) rte_delay_us_sleep(x * 1000)
+#define ENA_USLEEP(x) rte_delay_us_sleep(x)
 #define ENA_UDELAY(x) rte_delay_us_block(x)
 
 #define ENA_TOUCH(x) ((void)(x))
-- 
2.25.1


  parent reply	other threads:[~2020-09-17  5:31 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-17  5:30 [dpdk-dev] [PATCH 00/20] Upgrade HAL and add ENI metrics support Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 01/20] net/ena/base: use min/max macros with type conversion Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 02/20] net/ena/base: specify operations of rte_delay Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 03/20] net/ena/base: support 'resource busy' admin status Michal Krawczyk
2020-09-17  5:30 ` Michal Krawczyk [this message]
2020-09-17  5:30 ` [dpdk-dev] [PATCH 05/20] net/ena/base: fix release of wait event Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 06/20] net/ena/base: remove MMIOWB_NOT_DEFINED ifdef Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 07/20] net/ena/base: rework setup of accelerated LLQ mode Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 08/20] net/ena/base: add ENI stats Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 09/20] net/ena/base: split RSS function and hash getters Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 10/20] net/ena/base: do not use hardcoded RSS key buffer size Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 11/20] net/ena/base: check for RSS key configuration support Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 12/20] net/ena/base: minor style adjustments Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 13/20] net/ena/base: add missing unlikely Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 14/20] net/ena/base: store admin stats as u64 Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 15/20] net/ena/base: add check for meta desc being NULL Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 16/20] net/ena/base: convert values to u32 before shifting Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 17/20] net/ena/base: simplify loop copying Rx descs Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 18/20] net/ena/base: update generation date and commit Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 19/20] net/ena: lock dynamic usages of the admin queue Michal Krawczyk
2020-09-17  5:30 ` [dpdk-dev] [PATCH 20/20] net/ena: expose ENI stats as additional xstats Michal Krawczyk
2020-09-17 17:02 ` [dpdk-dev] [PATCH 00/20] Upgrade HAL and add ENI metrics support Stephen Hemminger
2020-09-22 12:24   ` Ferruh Yigit

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