[PATCH v2] eal_pci: Fix max_vfs missing for none igb_uio driver

[Michael Qiu <michael.qiu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

max_vfs will only be created by igb_uio driver, for other
drivers like vfio or pci_uio_generic, max_vfs will miss.

But sriov_numvfs is not driver related, just get the vf numbers
from that field.

Signed-off-by: Michael Qiu <michael.qiu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
v2 --> v1:
	backport for kernel version less than 3.8

 lib/librte_eal/linuxapp/eal/eal_pci.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index b5f5410..fcf5511 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -272,8 +272,16 @@ pci_scan_one(const char *dirname, uint16_t domain, uint8_t bus,
 	dev->max_vfs = 0;
 	snprintf(filename, sizeof(filename), "%s/max_vfs", dirname);
 	if (!access(filename, F_OK) &&
-	    eal_parse_sysfs_value(filename, &tmp) == 0) {
+	    eal_parse_sysfs_value(filename, &tmp) == 0)
 		dev->max_vfs = (uint16_t)tmp;
+	else {
+		/* for none igb_uio driver, need kernel
+		 * version greater than 3.8 */
+		snprintf(filename, sizeof(filename),
+			 "%s/sriov_numvfs", dirname);
+		if (!access(filename, F_OK) &&
+		    eal_parse_sysfs_value(filename, &tmp) == 0)
+			dev->max_vfs = (uint16_t)tmp;
 	}
 
 	/* get numa node */
-- 
1.9.3