[dpdk-dev] [PATCH v2 2/7] fm10k: setup rx queue interrupts for PF and VF

[Shaopeng He]

In interrupt mode, each rx queue can have one interrupt to notify the up
layer application when packets are available in that queue. Some queues
also can share one interrupt.
Currently, fm10k needs one separate interrupt for mailbox. So, only those
drivers which support multiple interrupt vectors e.g. vfio-pci can work
in fm10k interrupt mode.
This patch uses the RXINT/INT_MAP registers to map interrupt causes
(rx queue and other events) to vectors, and enable these interrupts
through kernel drivers like vfio-pci.

Signed-off-by: Shaopeng He <shaopeng.he at intel.com>
---
 drivers/net/fm10k/fm10k_ethdev.c | 93 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 86 insertions(+), 7 deletions(-)

diff --git a/drivers/net/fm10k/fm10k_ethdev.c b/drivers/net/fm10k/fm10k_ethdev.c
index a82cd59..68ae1ba 100644
--- a/drivers/net/fm10k/fm10k_ethdev.c
+++ b/drivers/net/fm10k/fm10k_ethdev.c
@@ -52,6 +52,8 @@
 /* Number of chars per uint32 type */
 #define CHARS_PER_UINT32 (sizeof(uint32_t))
 #define BIT_MASK_PER_UINT32 ((1 << CHARS_PER_UINT32) - 1)
+/* default 1:1 map from queue ID to interrupt vector ID */
+#define Q2V(dev, queue_id) (dev->pci_dev->intr_handle.intr_vec[queue_id])
 
 static void fm10k_close_mbx_service(struct fm10k_hw *hw);
 static void fm10k_dev_promiscuous_enable(struct rte_eth_dev *dev);
@@ -67,6 +69,8 @@ static void
 fm10k_MACVLAN_remove_all(struct rte_eth_dev *dev);
 static void fm10k_tx_queue_release(void *queue);
 static void fm10k_rx_queue_release(void *queue);
+static int
+fm10k_dev_rxq_interrupt_setup(struct rte_eth_dev *dev);
 
 static void
 fm10k_mbx_initlock(struct fm10k_hw *hw)
@@ -406,6 +410,7 @@ static int
 fm10k_dev_rx_init(struct rte_eth_dev *dev)
 {
 	struct fm10k_hw *hw = FM10K_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct rte_intr_handle *intr_handle = &dev->pci_dev->intr_handle;
 	int i, ret;
 	struct fm10k_rx_queue *rxq;
 	uint64_t base_addr;
@@ -413,10 +418,23 @@ fm10k_dev_rx_init(struct rte_eth_dev *dev)
 	uint32_t rxdctl = FM10K_RXDCTL_WRITE_BACK_MIN_DELAY;
 	uint16_t buf_size;
 
-	/* Disable RXINT to avoid possible interrupt */
-	for (i = 0; i < hw->mac.max_queues; i++)
+	/* enable RXINT for interrupt mode */
+	i = 0;
+	if (rte_intr_dp_is_en(intr_handle)) {
+		for (; i < dev->data->nb_rx_queues; i++) {
+			FM10K_WRITE_REG(hw, FM10K_RXINT(i), Q2V(dev, i));
+			if (hw->mac.type == fm10k_mac_pf)
+				FM10K_WRITE_REG(hw, FM10K_ITR(Q2V(dev, i)),
+					FM10K_ITR_AUTOMASK | FM10K_ITR_MASK_CLEAR);
+			else
+				FM10K_WRITE_REG(hw, FM10K_VFITR(Q2V(dev, i)),
+					FM10K_ITR_AUTOMASK | FM10K_ITR_MASK_CLEAR);
+		}
+	}
+	/* Disable other RXINT to avoid possible interrupt */
+	for (; i < hw->mac.max_queues; i++)
 		FM10K_WRITE_REG(hw, FM10K_RXINT(i),
-				3 << FM10K_RXINT_TIMER_SHIFT);
+			3 << FM10K_RXINT_TIMER_SHIFT);
 
 	/* Setup RX queues */
 	for (i = 0; i < dev->data->nb_rx_queues; ++i) {
@@ -741,6 +759,9 @@ fm10k_dev_start(struct rte_eth_dev *dev)
 		return diag;
 	}
 
+	if (fm10k_dev_rxq_interrupt_setup(dev))
+		return -EIO;
+
 	diag = fm10k_dev_rx_init(dev);
 	if (diag) {
 		PMD_INIT_LOG(ERR, "RX init failed: %d", diag);
@@ -1778,6 +1799,64 @@ fm10k_dev_disable_intr_vf(struct rte_eth_dev *dev)
 }
 
 static int
+fm10k_dev_rxq_interrupt_setup(struct rte_eth_dev *dev)
+{
+	struct fm10k_hw *hw = FM10K_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct rte_intr_handle *intr_handle = &dev->pci_dev->intr_handle;
+	uint32_t intr_vector, vec;
+	uint16_t queue_id;
+	int result = 0;
+
+	/* fm10k needs one separate interrupt for mailbox,
+	 * so only drivers which support multiple interrupt vectors
+	 * e.g. vfio-pci can work for fm10k interrupt mode
+	 */
+	if (!rte_intr_cap_multiple(intr_handle) ||
+			dev->data->dev_conf.intr_conf.rxq == 0)
+		return result;
+
+	intr_vector = dev->data->nb_rx_queues;
+
+	/* disable interrupt first */
+	rte_intr_disable(&dev->pci_dev->intr_handle);
+	if (hw->mac.type == fm10k_mac_pf)
+		fm10k_dev_disable_intr_pf(dev);
+	else
+		fm10k_dev_disable_intr_vf(dev);
+
+	if (rte_intr_efd_enable(intr_handle, intr_vector)) {
+		PMD_INIT_LOG(ERR, "Failed to init event fd");
+		result = -EIO;
+	}
+
+	if (rte_intr_dp_is_en(intr_handle) && !result) {
+		intr_handle->intr_vec =	rte_zmalloc("intr_vec",
+			dev->data->nb_rx_queues * sizeof(int), 0);
+		if (intr_handle->intr_vec) {
+			for (queue_id = 0, vec = RX_VEC_START;
+					queue_id < dev->data->nb_rx_queues;
+					queue_id++) {
+				intr_handle->intr_vec[queue_id] = vec;
+				if (vec < intr_handle->nb_efd - 1 + RX_VEC_START)
+					vec++;
+			}
+		} else {
+			PMD_INIT_LOG(ERR, "Failed to allocate %d rx_queues"
+				" intr_vec", dev->data->nb_rx_queues);
+			result = -ENOMEM;
+		}
+	}
+
+	if (hw->mac.type == fm10k_mac_pf)
+		fm10k_dev_enable_intr_pf(dev);
+	else
+		fm10k_dev_enable_intr_vf(dev);
+	rte_intr_enable(&dev->pci_dev->intr_handle);
+	hw->mac.ops.update_int_moderator(hw);
+	return result;
+}
+
+static int
 fm10k_dev_handle_fault(struct fm10k_hw *hw, uint32_t eicr)
 {
 	struct fm10k_fault fault;
@@ -2060,7 +2139,7 @@ static int
 eth_fm10k_dev_init(struct rte_eth_dev *dev)
 {
 	struct fm10k_hw *hw = FM10K_DEV_PRIVATE_TO_HW(dev->data->dev_private);
-	int diag;
+	int diag, i;
 	struct fm10k_macvlan_filter_info *macvlan;
 
 	PMD_INIT_FUNC_TRACE();
@@ -2177,7 +2256,7 @@ eth_fm10k_dev_init(struct rte_eth_dev *dev)
 		fm10k_dev_enable_intr_vf(dev);
 	}
 
-	/* Enable uio intr after callback registered */
+	/* Enable intr after callback registered */
 	rte_intr_enable(&(dev->pci_dev->intr_handle));
 
 	hw->mac.ops.update_int_moderator(hw);
@@ -2185,7 +2264,6 @@ eth_fm10k_dev_init(struct rte_eth_dev *dev)
 	/* Make sure Switch Manager is ready before going forward. */
 	if (hw->mac.type == fm10k_mac_pf) {
 		int switch_ready = 0;
-		int i;
 
 		for (i = 0; i < MAX_QUERY_SWITCH_STATE_TIMES; i++) {
 			fm10k_mbx_lock(hw);
@@ -2291,7 +2369,8 @@ static struct eth_driver rte_pmd_fm10k = {
 	.pci_drv = {
 		.name = "rte_pmd_fm10k",
 		.id_table = pci_id_fm10k_map,
-		.drv_flags = RTE_PCI_DRV_NEED_MAPPING | RTE_PCI_DRV_DETACHABLE,
+		.drv_flags = RTE_PCI_DRV_NEED_MAPPING | RTE_PCI_DRV_INTR_LSC |
+			RTE_PCI_DRV_DETACHABLE,
 	},
 	.eth_dev_init = eth_fm10k_dev_init,
 	.eth_dev_uninit = eth_fm10k_dev_uninit,
-- 
1.9.3