Bug 1008566 - InfiniBand device matching
InfiniBand device matching
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: NetworkManager (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
: rc
: ---
Assigned To: Dan Winship
Desktop QE
Depends On:
  Show dependency treegraph
Reported: 2013-09-16 11:37 EDT by Dan Winship
Modified: 2014-06-17 22:49 EDT (History)
6 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2014-06-13 07:17:37 EDT
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Add additional checks to spec_match_list (1.45 KB, patch)
2013-09-17 09:01 EDT, Thomas Haller
no flags Details | Diff

  None (edit)
Description Dan Winship 2013-09-16 11:37:51 EDT
Doug Ledford says:

> You can't match on the whole HWADDR in the ifcfg-*_ib? files.  Only
> the last 8 bytes are tied to the hardware like a MAC address, the
> remainder of the bytes are all things that can change due to external
> factors and should not be considered when matching interfaces on the
> system against interface definition files.  Currently, multiple of the
> rdma-dev-0? machines exhibit this behavior because I changed the subnet
> prefix, which changes byte 9 of the HWADDR.

This affects (at least) libnm-glib's nm_device_connection_compatible(), and the daemon's nm_device_check_connection_compatible() and nm_match_spec_hwaddr().
Comment 1 Dan Winship 2013-09-16 18:22:01 EDT
patches in danw/ib branch in git
Comment 2 Thomas Haller 2013-09-17 09:01:32 EDT
Created attachment 798804 [details]
Add additional checks to spec_match_list

nm_device_get_hw_address "can" return NULL, so check for it.

Apart from the attached patch, it looks good to me.
Comment 3 Jirka Klimes 2013-09-17 12:39:48 EDT
> infiniband: only check the last 8 bytes when doing hwaddr matches

Don't be want to compare case insensitively (I guess specs comes from the user)?
-strcmp (spec_str + 40, hwaddr_str + 36)
+strcasecmp (spec_str + 40, hwaddr_str + 36)

if (   g_str_has_prefix (iter->data, "mac:")
should be
if (   g_str_has_prefix (spec_str, "mac:")
to be consistent.

(In reply to Thomas Haller from comment #2)
> nm_device_get_hw_address "can" return NULL, so check for it.
nm_device_get_hw_address () is also used in nm-device-infiniband.c, so the check for NULL should be done there too.
Comment 4 Dan Winship 2013-09-23 09:48:59 EDT
(In reply to Thomas Haller from comment #2)
> nm_device_get_hw_address "can" return NULL, so check for it.

Only for devices that sometimes don't have a hardware address (like bluetooth). It can't return NULL for InifiniBand.

However, the suggestion to short-circuit the check if specs is NULL makes sense, and I added that in another patch.

(In reply to Jirka Klimes from comment #3)
> Don't be want to compare case insensitively

oh, yes. Fixed and re-pushed.

(I assume that even though both of you only commented on this bug, that you reviewed the whole branch, including the part that applies to bug 1008568?)
Comment 5 Dan Winship 2013-09-24 11:56:51 EDT
fixed in git
Comment 7 Vladimir Benes 2014-04-03 07:14:06 EDT
ifcfg file with infiniband mac address seems to be working correctly
Comment 8 Ludek Smid 2014-06-13 07:17:37 EDT
This request was resolved in Red Hat Enterprise Linux 7.0.

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