Bug 1494265

Summary: Dracut can not use jumbo frames for interfaces on a bond.
Product: Red Hat Enterprise Linux 7 Reporter: Robert LeBlanc <robert>
Component: dracutAssignee: Lukáš Nykrýn <lnykryn>
Status: CLOSED ERRATA QA Contact: Release Test Team <release-test-team-automation>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 7.4CC: dracut-maint-list, jikortus, jstodola
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: dracut-033-520.el7 Doc Type: If docs needed, set a value
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Last Closed: 2018-04-10 18:11:08 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description Flags
Adds MTU parameter to dracut bond= and configures the bond with the MTU. none

Description Robert LeBlanc 2017-09-21 21:28:59 UTC 
Created attachment 1329216 [details]
Adds MTU parameter to dracut bond= and configures the bond with the MTU.

Description of problem:
When configuring an interface on a bond to use jumbo frames in dracut, the interfaces are all set to 1500.

Version-Release number of selected component (if applicable):
7.3, 7.4

How reproducible:
Always

Steps to Reproduce:
1. Add ip=10.4.64.21::10.4.64.1:255.255.192.0::br0.1000:none:9000 bond=bond0:eth0:mode=1 bridge=br0:bond0 vlan=br0.1000:br0 to the command line (may also need rd.neednet=1 if not booting over network).
2. Clear out /etc/sysconfig/network-scripts/ifcfg-*
3. Reboot

Actual results:
# ip link
...
4: eth0: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP mode DEFAULT group default qlen 1000
...
11: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue master br0 state UP mode DEFAULT group default qlen 1000
12: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
13: br0.1000@br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000

Expected results:
Add ip=10.4.64.21::10.4.64.1:255.255.192.0::br0.1000:none:9000 bond=bond0:eth0:mode=1:9000 bridge=br0:bond0 vlan=br0.1000:br0 to the command line

ip link:
...
4: eth0: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 9000 qdisc mq master bond0 state UP mode DEFAULT group default qlen 1000
...
11: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 9000 qdisc noqueue master br0 state UP mode DEFAULT group default qlen 1000
12: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc noqueue state UP mode DEFAULT group default qlen 1000
13: br0.1000@br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc noqueue state UP mode DEFAULT group default qlen 1000

Additional info:
Upstream dracut almost has it right with commit 292548be6ec8e701dab1a532ca072707e890b12e, but there is an error in ifup.sh where $netif should be $bondname. I submitted https://github.com/dracutdevs/dracut/pull/286 to fix that. I'm attaching a good patch that works correctly.
Comment 2 Lukáš Nykrýn 2017-09-22 07:32:41 UTC 
Patch looks good to me, let's just wait for the upstream review.
Comment 3 Robert LeBlanc 2017-10-09 16:00:32 UTC 
Upstream merged the patch.
Comment 4 Lukáš Nykrýn 2017-11-03 12:41:09 UTC 
https://github.com/dracutdevs/dracut/commit/50d75a50fbebf96fe2937352aa2ea10e467b7ebd
https://github.com/dracutdevs/dracut/commit/50c3405ce0a62439708c51be949f275d2714d887
Comment 9 errata-xmlrpc 2018-04-10 18:11:08 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0964