Mellanox
Mellanox Quantum Plugin
Mellanox support OpenStack Folsom/Grizzly releases with an open source networking components through Quantum, It delivers higher compute and storage performance and additional functionality such as NIC based switching to provide better security and isolation for virtual cloud environment.
Mellanox Cinder Patch
Mellanox provides an OpenStack Storage (Cinder) plug-in that enables running storage volume traffic over native RDMA transport, providing 5X faster throughput over standard TCP/IP, while significantly increasing infrastructure efficiency by using less CPU resources.
References
1. OpenStack solution page at Mellanox site
For more details, please refer your question to openstack@mellanox.com [1]