[dpdk-dev] [PATCH v2 06/11] ixgbe: fix rx intr compatible issue with PF mbox

[Cunming Liang <cunming.liang@intel.com>]

When ixgbe runs as a PF, mbox interrupt is prerequisite to make VF start normally.
And PF sometimes won't 'dev_start', so the mbox interrupt register during 'dev_init' is required.
The patch rolls back the interrupt register for mbox,lsc to the 'dev_init'.
As UIO doesn't support multiple vector, mbox has to occupy the only one.
It adds condition check on 'dev_start', rxq interrupt is not allowed when PF running in IOV mode via UIO.

Signed-off-by: Cunming Liang <cunming.liang@intel.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 45 +++++++++++++++++++++++++++-------------
 1 file changed, 31 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 4e1467c..366923f 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -1032,6 +1032,13 @@ eth_ixgbe_dev_init(struct rte_eth_dev *eth_dev)
 			eth_dev->data->port_id, pci_dev->id.vendor_id,
 			pci_dev->id.device_id);
 
+	rte_intr_callback_register(&pci_dev->intr_handle,
+				   ixgbe_dev_interrupt_handler,
+				   (void *)eth_dev);
+
+	/* enable uio/vfio intr/eventfd mapping */
+	rte_intr_enable(&pci_dev->intr_handle);
+
 	/* enable support intr */
 	ixgbe_enable_intr(eth_dev);
 
@@ -1708,17 +1715,19 @@ ixgbe_dev_start(struct rte_eth_dev *dev)
 	ixgbe_pf_host_configure(dev);
 
 	/* check and configure queue intr-vector mapping */
-	if (dev->data->dev_conf.intr_conf.rxq != 0)
+	if (((RTE_ETH_DEV_SRIOV(dev).active &&
+	      rte_intr_cap_multiple(intr_handle)) ||
+	     !RTE_ETH_DEV_SRIOV(dev).active) &&
+	    dev->data->dev_conf.intr_conf.rxq != 0) {
 		intr_vector = dev->data->nb_rx_queues;
-
-	if (rte_intr_efd_enable(intr_handle, intr_vector))
-		return -1;
+		if (rte_intr_efd_enable(intr_handle, intr_vector))
+			return -1;
+	}
 
 	if (rte_intr_dp_is_en(intr_handle) && !intr_handle->intr_vec) {
 		intr_handle->intr_vec =
 			rte_zmalloc("intr_vec",
-				    dev->data->nb_rx_queues * sizeof(int),
-				    0);
+				    dev->data->nb_rx_queues * sizeof(int), 0);
 		if (intr_handle->intr_vec == NULL) {
 			PMD_INIT_LOG(ERR, "Failed to allocate %d rx_queues"
 				     " intr_vec\n", dev->data->nb_rx_queues);
@@ -1805,20 +1814,22 @@ ixgbe_dev_start(struct rte_eth_dev *dev)
 
 skip_link_setup:
 
-	/* check if lsc interrupt is enabled */
-	if (dev->data->dev_conf.intr_conf.lsc != 0) {
-		if (rte_intr_allow_others(intr_handle)) {
-			rte_intr_callback_register(intr_handle,
-						   ixgbe_dev_interrupt_handler,
-						   (void *)dev);
+	if (rte_intr_allow_others(intr_handle)) {
+		/* check if lsc interrupt is enabled */
+		if (dev->data->dev_conf.intr_conf.lsc != 0)
 			ixgbe_dev_lsc_interrupt_setup(dev);
-		} else
+	} else {
+		rte_intr_callback_unregister(intr_handle,
+					     ixgbe_dev_interrupt_handler,
+					     (void *)dev);
+		if (dev->data->dev_conf.intr_conf.lsc != 0)
 			PMD_INIT_LOG(INFO, "lsc won't enable because of"
 				     " no intr multiplex\n");
 	}
 
 	/* check if rxq interrupt is enabled */
-	if (dev->data->dev_conf.intr_conf.rxq != 0)
+	if (dev->data->dev_conf.intr_conf.rxq != 0 &&
+	    rte_intr_dp_is_en(intr_handle))
 		ixgbe_dev_rxq_interrupt_setup(dev);
 
 	/* enable uio/vfio intr/eventfd mapping */
@@ -1930,6 +1941,12 @@ ixgbe_dev_stop(struct rte_eth_dev *dev)
 	memset(filter_info->fivetuple_mask, 0,
 		sizeof(uint32_t) * IXGBE_5TUPLE_ARRAY_SIZE);
 
+	if (!rte_intr_allow_others(intr_handle))
+		/* resume to the default handler */
+		rte_intr_callback_register(intr_handle,
+					   ixgbe_dev_interrupt_handler,
+					   (void *)dev);
+
 	/* Clean datapath event and queue/vec mapping */
 	rte_intr_efd_disable(intr_handle);
 	if (intr_handle->intr_vec != NULL) {
-- 
2.4.3