netdev - [PATCH 6/7] vxge: independent interrupt moderation

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Message-Id: <1292025782-16372-6-git-send-email-jon.mason@exar.com>
Date:	Fri, 10 Dec 2010 18:03:01 -0600
From:	Jon Mason <jon.mason@...r.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org,
	Sivakumar Subramani <sivakumar.subramani@...r.com>,
	Sreenivasa Honnur <sreenivasa.honnur@...r.com>,
	Ram Vepa <ram.vepa@...r.com>
Subject: [PATCH 6/7] vxge: independent interrupt moderation

Configure the workload clock register and TIM register for independent
interrupt moderation based on the individual vpath utilization instead
of common link utilization.  This greatly improves latency.

Signed-off-by: Jon Mason <jon.mason@...r.com>
Signed-off-by: Ram Vepa <ram.vepa@...r.com>
---
 drivers/net/vxge/vxge-config.c |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/vxge/vxge-config.c b/drivers/net/vxge/vxge-config.c
index 1169aa3..01c05f5 100644
--- a/drivers/net/vxge/vxge-config.c
+++ b/drivers/net/vxge/vxge-config.c
@@ -4422,8 +4422,7 @@ __vxge_hw_vpath_tim_configure(struct __vxge_hw_device *hldev, u32 vp_id)
 
 		if (config->tti.util_sel != VXGE_HW_USE_FLASH_DEFAULT) {
 			val64 &= ~VXGE_HW_TIM_CFG3_INT_NUM_UTIL_SEL(0x3f);
-			val64 |= VXGE_HW_TIM_CFG3_INT_NUM_UTIL_SEL(
-					config->tti.util_sel);
+			val64 |= VXGE_HW_TIM_CFG3_INT_NUM_UTIL_SEL(vp_id);
 		}
 
 		if (config->tti.ltimer_val != VXGE_HW_USE_FLASH_DEFAULT) {
@@ -4527,8 +4526,7 @@ __vxge_hw_vpath_tim_configure(struct __vxge_hw_device *hldev, u32 vp_id)
 
 		if (config->rti.util_sel != VXGE_HW_USE_FLASH_DEFAULT) {
 			val64 &= ~VXGE_HW_TIM_CFG3_INT_NUM_UTIL_SEL(0x3f);
-			val64 |= VXGE_HW_TIM_CFG3_INT_NUM_UTIL_SEL(
-					config->rti.util_sel);
+			val64 |= VXGE_HW_TIM_CFG3_INT_NUM_UTIL_SEL(vp_id);
 		}
 
 		if (config->rti.ltimer_val != VXGE_HW_USE_FLASH_DEFAULT) {
@@ -4549,6 +4547,11 @@ __vxge_hw_vpath_tim_configure(struct __vxge_hw_device *hldev, u32 vp_id)
 	writeq(val64, &vp_reg->tim_cfg2_int_num[VXGE_HW_VPATH_INTR_BMAP]);
 	writeq(val64, &vp_reg->tim_cfg3_int_num[VXGE_HW_VPATH_INTR_BMAP]);
 
+	val64 = VXGE_HW_TIM_WRKLD_CLC_WRKLD_EVAL_PRD(150);
+	val64 |= VXGE_HW_TIM_WRKLD_CLC_WRKLD_EVAL_DIV(0);
+	val64 |= VXGE_HW_TIM_WRKLD_CLC_CNT_RX_TX(3);
+	writeq(val64, &vp_reg->tim_wrkld_clc);
+
 	return status;
 }
 
-- 
1.7.0.4

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