From fb98e84fc1ad71996903ef573d3bd02083762520 Mon Sep 17 00:00:00 2001
From: Intel <intel.com>
Date: Thu, 20 Dec 2012 00:00:00 +0100
Subject: [PATCH] igb_uio: allow to configure interrupt mode

Signed-off-by: Intel
---
 lib/librte_eal/linuxapp/igb_uio/igb_uio.c | 41 +++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
index 18e2dd144d..51dd153bac 100644
--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
@@ -66,7 +66,8 @@ struct rte_uio_pci_dev {
 		msix_entries[IGBUIO_NUM_MSI_VECTORS]; /* pointer to the msix vectors to be allocated later */
 };
 
-static const enum igbuio_intr_mode igbuio_intr_mode_preferred = IGBUIO_MSIX_INTR_MODE;
+static char *intr_mode = NULL;
+static enum igbuio_intr_mode igbuio_intr_mode_preferred = IGBUIO_MSIX_INTR_MODE;
 
 /* PCI device id table */
 static struct pci_device_id igbuio_pci_ids[] = {
@@ -401,7 +402,8 @@ igbuio_pci_remove(struct pci_dev *dev)
 
 	uio_unregister_device(info);
 	igbuio_pci_release_iomem(info);
-	if (((struct rte_uio_pci_dev *)info->priv)->mode == IGBUIO_MSIX_INTR_MODE)
+	if (((struct rte_uio_pci_dev *)info->priv)->mode ==
+					IGBUIO_MSIX_INTR_MODE)
 		pci_disable_msix(dev);
 	pci_release_regions(dev);
 	pci_disable_device(dev);
@@ -409,6 +411,28 @@ igbuio_pci_remove(struct pci_dev *dev)
 	kfree(info);
 }
 
+static int
+igbuio_config_intr_mode(char *intr_str)
+{
+	if (!intr_str) {
+		printk(KERN_INFO "Use MSIX interrupt by default\n");
+		return 0;
+	}
+
+	if (!strcmp(intr_str, "msix")) {
+		igbuio_intr_mode_preferred = IGBUIO_MSIX_INTR_MODE;
+		printk(KERN_INFO "Use MSIX interrupt\n");
+	} else if (!strcmp(intr_str, "legacy")) {
+		igbuio_intr_mode_preferred = IGBUIO_LEGACY_INTR_MODE;
+		printk(KERN_INFO "Use legacy interrupt\n");
+	} else {
+		printk(KERN_INFO "Error: bad parameter - %s\n", intr_str);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static struct pci_driver igbuio_pci_driver = {
 	.name = "igb_uio",
 	.id_table = igbuio_pci_ids,
@@ -419,6 +443,12 @@ static struct pci_driver igbuio_pci_driver = {
 static int __init
 igbuio_pci_init_module(void)
 {
+	int ret;
+
+	ret = igbuio_config_intr_mode(intr_mode);
+	if (ret < 0)
+		return ret;
+
 	return pci_register_driver(&igbuio_pci_driver);
 }
 
@@ -431,6 +461,13 @@ igbuio_pci_exit_module(void)
 module_init(igbuio_pci_init_module);
 module_exit(igbuio_pci_exit_module);
 
+module_param(intr_mode, charp, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(intr_mode,
+"igb_uio interrupt mode (default=msix):\n"
+"    msix       Use MSIX interrupt\n"
+"    legacy     Use Legacy interrupt\n"
+"\n");
+
 MODULE_DESCRIPTION("UIO driver for Intel IGB PCI cards");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Intel Corporation");
-- 
2.20.1