When you have a version of onePK that has DPSS support on Nexus, then yes, you will be able to inject entire L2 frames of a custom format to the OUTPUT of interfaces. However, there may be hardware validation of frames that could cause the packet to be dropped by the hardware, so exactly what frame formats you will be able to create will have limits. Some of the validation may also depend on the configuration of the interface you are injecting packets to.
Thanks for your interest in Data Path Service Set (DPSS) support on the Nexus switching platforms.
While there are no plans to support DPSS on the Nexus switching platforms in the near term, can you provide the target Nexus switching platform numbers you have in mind along with a brief description of what you plan to do with them and how you see them providing value to your company? I'd be more than happy to get this on the radar for future development.
I was looking to OnePK as a perfect tookit to perform a POC in Cisco gear for a zero touch alternative to the Spanning Tree Protocol I have developed. For that, I would need DPSS support on the Nexus switching platforms.
Moreover, from my large experience in networking support and operation, I see a lot of potentialities in terms of security, management and traffic engineering, at L2 level.