Kernel Vrouter: Not able to set jumbo mtu on vhost0

[Vinod Nair]

In Kernel Vrouters running on redhat 7.5 / Centos , setting mtu greater than 1500 is being rejected
On any centos or redhat kernel greater than below this issue is seen

Kernel Version > 3.10.0-693.21.1.el7.x86_64

Redhat has punted the case back to us as it involves vrouter.

https://bugzilla.redhat.com/show_bug.cgi?id=1619780

How reproducible:
 ifconfig vhost0 mtu 8000
SIOCSIFMTU: Invalid argument

[root@server8 ~]# dmesg
[79484.948787] vhost0: Invalid MTU 8000 requested, hw max 1500

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/46015
Submitter: Saurabh (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/46018
Submitter: Saurabh (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/46024
Submitter: Saurabh (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/46025
Submitter: Saurabh (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/46018
Committed: http://github.com/Juniper/contrail-vrouter/commit/e746164b1c9efd3793590d306e3b2dda6f74afda
Submitter: Zuul v3 CI (<email address hidden>)
Branch: master

commit e746164b1c9efd3793590d306e3b2dda6f74afda
Author: Saurabh Gupta <email address hidden>
Date: Thu Sep 6 15:50:51 2018 +0530

Fix for the bug not allowing custom MTU to be set on vhost interface on
centos kernels. max_mtu is now part of net_device->extended struct. Corrected
the reference and the logic so that the initialization is not skipped.
closes-bug: #1790766

Change-Id: I9db33970943050566d3fb76986b06fa5563fddc8

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/46024
Committed: http://github.com/Juniper/contrail-vrouter/commit/4c85f682d4a9b3aec8526469fb8b9317feb3a1b1
Submitter: Zuul v3 CI (<email address hidden>)
Branch: R5.0

commit 4c85f682d4a9b3aec8526469fb8b9317feb3a1b1
Author: Saurabh Gupta <email address hidden>
Date: Thu Sep 6 15:50:51 2018 +0530

Fix for the bug not allowing custom MTU to be set on vhost interface on
centos kernels. max_mtu is now part of net_device->extended struct. Corrected
the reference and the logic so that the initialization is not skipped.
closes-bug: #1790766

Change-Id: I9db33970943050566d3fb76986b06fa5563fddc8

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/46025
Committed: http://github.com/Juniper/contrail-vrouter/commit/e921c5f7ec8a10eb3bba3aeae9cafa67e98d5149
Submitter: Zuul (<email address hidden>)
Branch: R4.1

commit e921c5f7ec8a10eb3bba3aeae9cafa67e98d5149
Author: Saurabh Gupta <email address hidden>
Date: Thu Sep 6 15:50:51 2018 +0530

Fix for the bug not allowing custom MTU to be set on vhost interface on
centos kernels. max_mtu is now part of net_device->extended struct. Corrected
the reference and the logic so that the initialization is not skipped.
closes-bug: #1790766

Change-Id: I9db33970943050566d3fb76986b06fa5563fddc8