[dpdk-dev] [PATCH v2] net/e1000: fix cannot getting Rx interrupts issue

[Xiaoyun Li <xiaoyun.li@intel.com>]

When using VFIO and MSIX interrupt mode, cannot get Rx interrupts. Because
when enabling the interrupt vectors, the offset is computed in a way which
only supports IGB_UIO. But the offset should be different when using VFIO.
This patch fixes this issue.

Fixes: c3cd3de0ab50 ("igb: enable Rx queue interrupts for PF")
Cc: stable@dpdk.org

Signed-off-by: Xiaoyun Li <xiaoyun.li@intel.com>
---
v2:
* Modify the commit log to be more clear.

 drivers/net/e1000/igb_ethdev.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index 003bdf0..dc70d22 100644
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -5387,7 +5387,14 @@ eth_igb_rx_queue_intr_disable(struct rte_eth_dev *dev, uint16_t queue_id)
 {
 	struct e1000_hw *hw =
 		E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
-	uint32_t mask = 1 << 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 vec = E1000_MISC_VEC_ID;
+
+	if (rte_intr_allow_others(intr_handle))
+		vec = E1000_RX_VEC_START;
+
+	uint32_t mask = 1 << (queue_id + vec);
 
 	E1000_WRITE_REG(hw, E1000_EIMC, mask);
 	E1000_WRITE_FLUSH(hw);
@@ -5402,7 +5409,12 @@ eth_igb_rx_queue_intr_enable(struct rte_eth_dev *dev, uint16_t queue_id)
 		E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 	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 = 1 << queue_id;
+	uint32_t vec = E1000_MISC_VEC_ID;
+
+	if (rte_intr_allow_others(intr_handle))
+		vec = E1000_RX_VEC_START;
+
+	uint32_t mask = 1 << (queue_id + vec);
 	uint32_t regval;
 
 	regval = E1000_READ_REG(hw, E1000_EIMS);
-- 
2.7.4