From: Peng Li <lipeng321@huawei.com>
Date: Tue, 18 Dec 2018 19:37:54 +0800
Subject: net: hns3: update coalesce param per second
Patch-mainline: v5.0-rc1
Git-commit: 7445565cd064679421e3cf4d440589ee723f6c08
References: bsc#1104353 FATE#326415

coalesce param updates every 100 napi times, it may update a little
late if ping test after a high rate flow, may over napi poll is called
100 times as ping test sends packets every second.

This patch updates coalesce param every second, instead with every
100 napi times. It can not update the param 100% in time, but the
lag time is very short.

Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c |    8 +++-----
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.h |    4 ----
 2 files changed, 3 insertions(+), 9 deletions(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -240,7 +240,6 @@ static void hns3_vector_gl_rl_init(struc
 	tqp_vector->tx_group.coal.int_gl = HNS3_INT_GL_50K;
 	tqp_vector->rx_group.coal.int_gl = HNS3_INT_GL_50K;
 
-	tqp_vector->int_adapt_down = HNS3_INT_ADAPT_DOWN_START;
 	tqp_vector->rx_group.coal.flow_level = HNS3_FLOW_LOW;
 	tqp_vector->tx_group.coal.flow_level = HNS3_FLOW_LOW;
 }
@@ -2846,10 +2845,10 @@ static void hns3_update_new_int_gl(struc
 	struct hns3_enet_ring_group *tx_group = &tqp_vector->tx_group;
 	bool rx_update, tx_update;
 
-	if (tqp_vector->int_adapt_down > 0) {
-		tqp_vector->int_adapt_down--;
+	/* update param every 1000ms */
+	if (time_before(jiffies,
+			tqp_vector->last_jiffies + msecs_to_jiffies(1000)))
 		return;
-	}
 
 	if (rx_group->coal.gl_adapt_enable) {
 		rx_update = hns3_get_new_int_gl(rx_group);
@@ -2866,7 +2865,6 @@ static void hns3_update_new_int_gl(struc
 	}
 
 	tqp_vector->last_jiffies = jiffies;
-	tqp_vector->int_adapt_down = HNS3_INT_ADAPT_DOWN_START;
 }
 
 static int hns3_nic_common_poll(struct napi_struct *napi, int budget)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
@@ -476,8 +476,6 @@ enum hns3_link_mode_bits {
 #define HNS3_INT_RL_MAX			0x00EC
 #define HNS3_INT_RL_ENABLE_MASK		0x40
 
-#define HNS3_INT_ADAPT_DOWN_START	100
-
 struct hns3_enet_coalesce {
 	u16 int_gl;
 	u8 gl_adapt_enable;
@@ -512,8 +510,6 @@ struct hns3_enet_tqp_vector {
 
 	char name[HNAE3_INT_NAME_LEN];
 
-	/* when 0 should adjust interrupt coalesce parameter */
-	u8 int_adapt_down;
 	unsigned long last_jiffies;
 } ____cacheline_internodealigned_in_smp;