Since we now have a list of interrupt modes for sysfs,
use that to match module param values. This also allows msi
to be selected as a preferred mode.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
@@ -605,21 +605,24 @@
 static int
 igbuio_config_intr_mode(char *intr_str)
 {
+	unsigned int i;
+
 	if (!intr_str) {
 		pr_info("Use MSIX interrupt by default\n");
 		return 0;
 	}
 
-	if (!strcmp(intr_str, "msix")) {
-		igbuio_intr_mode_preferred = IGBUIO_MSIX_INTR_MODE;
-		pr_info("Use MSIX interrupt\n");
-	} else if (!strcmp(intr_str, "legacy")) {
-		igbuio_intr_mode_preferred = IGBUIO_LEGACY_INTR_MODE;
-		pr_info("Use legacy interrupt\n");
-	} else {
-		pr_info("Error: bad parameter - %s\n", intr_str);
-		return -EINVAL;
-	}
+	for (i = 0; i < ARRAY_SIZE(igbuio_intr_modes); i++) {
+		const char *mode = igbuio_intr_modes[i];
+		if (!strcmp(intr_str, mode)) {
+			pr_info("Use %s interrupt mode\n", mode);
+			igbuio_intr_mode_preferred = i;
+			return 0;
+		}
+ 	}
+
+	pr_warn("bad interrupt mode parameter %s\n", intr_str);
+	return -EINVAL;
 
 	return 0;
 }
@@ -656,6 +659,7 @@
 MODULE_PARM_DESC(intr_mode,
 "igb_uio interrupt mode (default=msix):\n"
 "    msix       Use MSIX interrupt\n"
+"    msi	Use MSI interrupt\n"
 "    legacy     Use Legacy interrupt\n"
 "\n");