Enabling the use of Jumbo frames in the nexus world differs from the IOS world. On the 5Ks this is a global command set with a policy map. Once this is in place, all interfaces are capable of sending and receiving Jumbo frames.

policy-map type network-qos jumbo
class type network-qos class-default
mtu 9216
system qos
service-policy type network-qos jumbo

Cisco Documentation is here.