[libvirt] [PATCH 2/5] virnetdev: Document reasons for ignoring some SIOCETHTOOL errno values
Recently reverted commit id '6f2a0198' showed a need to add extra
comments when dealing with filtering of potential "non-issues".
Scanning through upstream patch postings indicates early on the
reasons for the filtering of specific ioctl failures were provided;
however, when converted from causing an error to VIR_DEBUG's the
reasons were missing. A future read/change of the code incorrectly
assumed they could or should be removed.
Signed-off-by: John Ferlan <jferlan(a)redhat.com>
---
src/util/virnetdev.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/src/util/virnetdev.c b/src/util/virnetdev.c
index 971e24d..3bd7dbb 100644
--- a/src/util/virnetdev.c
+++ b/src/util/virnetdev.c
@@ -3166,13 +3166,13 @@ virNetDevSendEthtoolIoctl(const char *ifname, void *cmd)
ret = ioctl(sock, SIOCETHTOOL, &ifr);
if (ret != 0) {
switch (errno) {
- case EPERM:
+ case EPERM: /* attempt to call SIOCETHTOOL from unprivileged code */
VIR_DEBUG("ethtool ioctl: permission denied");
break;
- case EINVAL:
+ case EINVAL: /* kernel doesn't support SIOCETHTOOL */
VIR_DEBUG("ethtool ioctl: invalid request");
break;
- case EOPNOTSUPP:
+ case EOPNOTSUPP: /* kernel doesn't support specific feature */
VIR_DEBUG("ethtool ioctl: request not supported");
break;
default:
--
2.1.0