pkg/sriov: Restore VF name after rebinding

[DmytroLinkin]

Due to kernel driver constraints, on cmdDel the plugin is required to rebind the VF in order to restore the VF's GUID value. During VF rebind the kernel may assign the VF netdev a new name from predefined scheme, which can differs from its initial name that the plugin caches. This may cause conflicts with other VFs that are currently cached and processed by plugin. For example: Two pods were created:

• Pod A with and corresponding netdev ib0.
• Pod B with and corresponding netdev ib1.

If pod B is deleted first, then after GUID value is restored (driver rebind occurs) it will get the netdev name ib0. This causes the plugin to fail on Pod A pod deletion, when, on CmdDel, it tries to move

netdev to the host netns, since its cached (original) name `ib0' already exist. We fix that by restoring initial name from the cached config after VF rebinding. Fix: #51

[coveralls]

Pull Request Test Coverage Report for Build 137

• 14 of 24 (58.33%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.5%) to 44.383%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/sriov/sriov.go	14	24	58.33%
<!--	Total:	14	24	58.33%	-->

Totals
Change from base Build 161:	0.5%
Covered Lines:	241
Relevant Lines:	543

---

💛 - Coveralls