netdev - Re: [RFC PATCH 00/13] Ultra Ethernet driver introduction

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Message-ID: <20250320201200.GL206770@nvidia.com>
Date: Thu, 20 Mar 2025 17:12:00 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Sean Hefty <shefty@...dia.com>
Cc: Yunsheng Lin <linyunsheng@...wei.com>,
	Nikolay Aleksandrov <nikolay@...abrica.net>,
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Subject: Re: [RFC PATCH 00/13] Ultra Ethernet driver introduction

On Thu, Mar 20, 2025 at 08:05:05PM +0000, Sean Hefty wrote:
> > > As the existing rdma subsystem doesn't seems to support the above use
> > > case yet
> > 
> > Why would you say that? If EFA needs SRD and RDM objects in RDMA they
> > can create them, it is not a big issue. To my knowledge they haven't asked for
> > them.
> 
> When looking at how to integrate UET support into verbs, there were
> changes relevant to this discussion that I found needed.
>
> 1. Allow an RDMA device to indicate that it supports multiple transports, separated per port.
> 2. Specify the QP type separate from the protocol.
> 3. Define a reliable, unconnected QP type.
> 
> Lin might be referring to 2 (assuming 3 is resolved).

That's at a verbs level though, at the kernel uAPI level we already have
various ways to do all three..

What you say makes sense to me for verbs.

Jason