linux-kernel - Re: [PATCH rdma-next v1 00/11] Add Enhanced Connection Established (ECE)

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Message-ID: <20200313140006.GJ31504@unreal>
Date:   Fri, 13 Mar 2020 16:00:06 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Doug Ledford <dledford@...hat.com>,
        Gal Pressman <galpress@...zon.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        Mark Zhang <markz@...lanox.com>,
        Yishai Hadas <yishaih@...lanox.com>
Subject: Re: [PATCH rdma-next v1 00/11] Add Enhanced Connection Established
 (ECE)

On Fri, Mar 13, 2020 at 10:53:03AM -0300, Jason Gunthorpe wrote:
> On Tue, Mar 10, 2020 at 11:14:27AM +0200, Leon Romanovsky wrote:
> > From: Leon Romanovsky <leonro@...lanox.com>
> >
> > Changelog:
> >  v1: Dropped field_avail patch in favor of mass conversion to use function
> >      which already exists in the kernel code.
> >  v0: https://lore.kernel.org/lkml/20200305150105.207959-1-leon@kernel.org
> >
> > Enhanced Connection Established or ECE is new negotiation scheme
> > introduced in IBTA v1.4 to exchange extra information about nodes
> > capabilities and later negotiate them at the connection establishment
> > phase.
> >
> > The RDMA-CM messages (REQ, REP, SIDR_REQ and SIDR_REP) were extended
> > to carry two fields, one new and another gained new functionality:
> >  * VendorID is a new field that indicates that common subset of vendor
> >    option bits are supported as indicated by that VendorID.
> >  * AttributeModifier already exists, but overloaded to indicate which
> >    vendor options are supported by this VendorID.
> >
> > This is kernel part of such functionality which is responsible to get data
> > from librdmacm and properly create and handle RDMA-CM messages.
> >
> > Thanks
> >
> > Leon Romanovsky (11):
> >   RDMA/mlx4: Delete duplicated offsetofend implementation
> >   RDMA/mlx5: Use offsetofend() instead of duplicated variant
> >   RDMA/cm: Delete not implemented CM peer to peer communication
>
> These ones applied to for-next

Thanks

>
> >   RDMA/efa: Use in-kernel offsetofend() to check field availability
>
> This needs resending

I'm not convinced yet.

>
> >   RDMA/cm: Add Enhanced Connection Establishment (ECE) bits
> >   RDMA/uapi: Add ECE definitions to UCMA
> >   RDMA/ucma: Extend ucma_connect to receive ECE parameters
> >   RDMA/ucma: Deliver ECE parameters through UCMA events
> >   RDMA/cm: Send and receive ECE parameter over the wire
> >   RDMA/cma: Connect ECE to rdma_accept
> >   RDMA/cma: Provide ECE reject reason
>
> These need userspace to not be RFC

Sure, thanks.

>
> Jason