linux-kernel - Re: [PATCH rdma-next 2/2] RDMA/mana_ib: Implement get_dma

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Message-ID: <20240419121357.GB223006@ziepe.ca>
Date: Fri, 19 Apr 2024 09:13:57 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Konstantin Taranov <kotaranov@...rosoft.com>
Cc: Konstantin Taranov <kotaranov@...ux.microsoft.com>,
	"sharmaajay@...rosoft.com" <sharmaajay@...rosoft.com>,
	Long Li <longli@...rosoft.com>, "leon@...nel.org" <leon@...nel.org>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH rdma-next 2/2] RDMA/mana_ib: Implement get_dma_mr

On Fri, Apr 19, 2024 at 09:14:14AM +0000, Konstantin Taranov wrote:
> > From: Jason Gunthorpe <jgg@...pe.ca>
> > On Wed, Apr 17, 2024 at 07:20:59AM -0700, Konstantin Taranov wrote:
> > > From: Konstantin Taranov <kotaranov@...rosoft.com>
> > >
> > > Implement allocation of DMA-mapped memory regions.
> > >
> > > Signed-off-by: Konstantin Taranov <kotaranov@...rosoft.com>
> > > ---
> > >  drivers/infiniband/hw/mana/device.c |  1 +
> > >  drivers/infiniband/hw/mana/mr.c     | 36
> > +++++++++++++++++++++++++++++
> > >  include/net/mana/gdma.h             |  5 ++++
> > >  3 files changed, 42 insertions(+)
> > 
> > What is the point of doing this without supporting enough verbs to allow a
> > kernel ULP?
> > 
> 
> True, the proposed code is useless at this state.
> Nevertheless, mana_ib team aims to send kernel ULP patches after we are done
> with uverbs pathes (i.e., udata is not null). As this change does not conflict with the
> current effort, I decided to send this patch now. I can extend the series to make
> it more useful.
> 
> Jason, could  you suggest a minimal list of ib_device_ops methods, that includes
> get_dma_mr, which can be approved?

Is there any chance you can send a single series to support a
ULP. NVMe or something like?

Jason