From: Pavel Hrdina <phrdina@redhat.com>
Date: Thu, 7 Mar 2019 16:52:55 +0000 (+0100)
Subject: util: skip RDMA detection for non-PCI network devices
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=f38ef0fac0582ac0cbb749af9d3f8ba515a6084a;p=libvirt.git

util: skip RDMA detection for non-PCI network devices

Only PCI devices have '/sys/class/net/<ifname>/device/resource' so we
need to skip this check for all other network devices.

Without this patch and RDMA enabled libvirt will not detect any network
device that doesn't have the path above which includes 'lo', 'virbr',
'tun', etc.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1639258

Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
---

diff --git a/src/util/virnetdev.c b/src/util/virnetdev.c
index aeb9caab2a..699f2a0acb 100644
--- a/src/util/virnetdev.c
+++ b/src/util/virnetdev.c
@@ -2914,8 +2914,14 @@ virNetDevRDMAFeature(const char *ifname,
 
     if (virAsprintf(&eth_devpath, SYSFS_NET_DIR "%s/device/resource", ifname) < 0)
         goto cleanup;
-    if (!virFileExists(eth_devpath))
+
+    /* If /sys/class/net/<ifname>/device/resource doesn't exist it is not a PCI
+     * device and therefore it will not have RDMA. */
+    if (!virFileExists(eth_devpath)) {
+        ret = 0;
         goto cleanup;
+    }
+
     if (virFileReadAll(eth_devpath, RESOURCE_FILE_LEN, &eth_res_buf) < 0)
         goto cleanup;