[dpdk-dev] [PATCH v3 5/5] net/ixgbe: remove the unnecessary call rte_intr_enable.

[xiangxia.m.yue@gmail.com]

From: Tonghao Zhang <xiangxia.m.yue@gmail.com>

When binding the ixgbe pf or vf to vfio and call the
rte_eth_dev_rx_intr_enable frequently, the interrupt setting
(msi_set_mask_bit) will take more CPU as show below. rte_intr_enable
calls the ioctl to map the fd to interrupts frequently.

perf top:
5.45%  [kernel]   [k] msi_set_mask_bit

It is unnecessary to call the rte_intr_enable in
ixgbe_dev_rx_queue_intr_enable. Because the fds has been mapped to
interrupt and not unmapped in ixgbe_dev_rx_queue_intr_disable.

With the patch, msi_set_mask_bit is not listed in perl anymore.

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 7928144..ef01e0c 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -4253,7 +4253,7 @@ static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
  */
 static int
 ixgbe_dev_interrupt_action(struct rte_eth_dev *dev,
-			   struct rte_intr_handle *intr_handle)
+			   __rte_unused struct rte_intr_handle *intr_handle)
 {
 	struct ixgbe_interrupt *intr =
 		IXGBE_DEV_PRIVATE_TO_INTR(dev->data->dev_private);
@@ -4304,7 +4304,6 @@ static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 
 	PMD_DRV_LOG(DEBUG, "enable intr immediately");
 	ixgbe_enable_intr(dev);
-	rte_intr_enable(intr_handle);
 
 	return 0;
 }
@@ -4327,8 +4326,6 @@ static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 ixgbe_dev_interrupt_delayed_handler(void *param)
 {
 	struct rte_eth_dev *dev = (struct rte_eth_dev *)param;
-	struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
-	struct rte_intr_handle *intr_handle = &pci_dev->intr_handle;
 	struct ixgbe_interrupt *intr =
 		IXGBE_DEV_PRIVATE_TO_INTR(dev->data->dev_private);
 	struct ixgbe_hw *hw =
@@ -4366,7 +4363,6 @@ static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 
 	PMD_DRV_LOG(DEBUG, "enable intr in delayed handler S[%08x]", eicr);
 	ixgbe_enable_intr(dev);
-	rte_intr_enable(intr_handle);
 }
 
 /**
@@ -5607,8 +5603,6 @@ static void ixgbevf_set_vfta_all(struct rte_eth_dev *dev, bool on)
 	RTE_SET_USED(queue_id);
 	IXGBE_WRITE_REG(hw, IXGBE_VTEIMS, intr->mask);
 
-	rte_intr_enable(intr_handle);
-
 	return 0;
 }
 
@@ -5635,8 +5629,6 @@ static void ixgbevf_set_vfta_all(struct rte_eth_dev *dev, bool on)
 static int
 ixgbe_dev_rx_queue_intr_enable(struct rte_eth_dev *dev, uint16_t queue_id)
 {
-	struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
-	struct rte_intr_handle *intr_handle = &pci_dev->intr_handle;
 	uint32_t mask;
 	struct ixgbe_hw *hw =
 		IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
@@ -5656,7 +5648,6 @@ static void ixgbevf_set_vfta_all(struct rte_eth_dev *dev, bool on)
 		mask &= (1 << (queue_id - 32));
 		IXGBE_WRITE_REG(hw, IXGBE_EIMS_EX(1), mask);
 	}
-	rte_intr_enable(intr_handle);
 
 	return 0;
 }
-- 
1.8.3.1