[dpdk-dev] [PATCH 1/2] net/i40e: enable hotplug in i40e

[Jeff Guo <jia.guo@intel.com>]

This patch aim to enable hotplug in i40e pmd driver. Firstly it set
the flags RTE_PCI_DRV_INTR_RMV in drv_flags to announce the hotplug
ability, and then use rte_dev_event_callback_register to register
the hotplug event callback to eal, when eal detect the hotplug event,
will call the callback to process it, if the event is hotplug remove,
it will trigger the RTE_ETH_EVENT_INTR_RMV event into ethdev callback
to letapp process the hotplug for the ethdev.

This is an example for other driver, that if any driver support hotplug
feature could be use this way to enable hotplug

Signed-off-by: Jeff Guo <jia.guo@intel.com>
---
 drivers/net/i40e/i40e_ethdev.c | 46 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 13c5d32..ad4231f 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -688,7 +688,7 @@ static int eth_i40e_pci_remove(struct rte_pci_device *pci_dev)
 static struct rte_pci_driver rte_i40e_pmd = {
 	.id_table = pci_id_i40e_map,
 	.drv_flags = RTE_PCI_DRV_NEED_MAPPING | RTE_PCI_DRV_INTR_LSC |
-		     RTE_PCI_DRV_IOVA_AS_VA,
+		     RTE_PCI_DRV_IOVA_AS_VA | RTE_PCI_DRV_INTR_RMV,
 	.probe = eth_i40e_pci_probe,
 	.remove = eth_i40e_pci_remove,
 };
@@ -1183,6 +1183,47 @@ i40e_aq_debug_write_global_register(struct i40e_hw *hw,
 	return i40e_aq_debug_write_register(hw, reg_addr, reg_val, cmd_details);
 }
 
+static void
+eth_dev_event_callback(char *device_name, enum rte_dev_event_type type,
+		       __rte_unused void *arg)
+{
+	uint32_t pid;
+
+	if (type >= RTE_DEV_EVENT_MAX) {
+		fprintf(stderr, "%s called upon invalid event %d\n",
+			__func__, type);
+		fflush(stderr);
+	}
+
+	switch (type) {
+	case RTE_DEV_EVENT_REMOVE:
+		PMD_DRV_LOG(INFO, "The device: %s has been removed!\n",
+			    device_name);
+
+		if (!device_name)
+			return;
+
+		for (pid = 0; pid < RTE_MAX_ETHPORTS; pid++) {
+			if (rte_eth_devices[pid].device) {
+				if (!strcmp(device_name,
+				    rte_eth_devices[pid].device->name)) {
+					_rte_eth_dev_callback_process(
+						&rte_eth_devices[pid],
+						RTE_ETH_EVENT_INTR_RMV, NULL);
+					continue;
+				}
+			}
+		}
+		break;
+	case RTE_DEV_EVENT_ADD:
+		RTE_LOG(INFO, EAL, "The device: %s has been added!\n",
+			device_name);
+		break;
+	default:
+		break;
+	}
+}
+
 static int
 eth_i40e_dev_init(struct rte_eth_dev *dev, void *init_params __rte_unused)
 {
@@ -1442,6 +1483,9 @@ eth_i40e_dev_init(struct rte_eth_dev *dev, void *init_params __rte_unused)
 	rte_intr_callback_register(intr_handle,
 				   i40e_dev_interrupt_handler, dev);
 
+	/* register the device event callback */
+	rte_dev_event_callback_register(NULL, eth_dev_event_callback, NULL);
+
 	/* configure and enable device interrupt */
 	i40e_pf_config_irq0(hw, TRUE);
 	i40e_pf_enable_irq0(hw);
-- 
2.7.4