linux-kernel - Re: [PATCH] rdma: move the ib_wr

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Date:   Mon, 17 Sep 2018 15:08:24 -0600
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     "Walker, Benjamin" <benjamin.walker@...el.com>
Cc:     "Howell, Seth" <seth.howell@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "monis@...lanox.com" <monis@...lanox.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "dledford@...hat.com" <dledford@...hat.com>
Subject: Re: [PATCH] rdma: move the ib_wr_opcode enum to include/uapi

On Mon, Sep 17, 2018 at 08:38:16PM +0000, Walker, Benjamin wrote:
> On Mon, 2018-08-20 at 14:32 -0700, Howell, Seth wrote:
> > Hi Jason,
> > 
> > I apologize for the few days of radio silence on this one. I was able to apply
> > your patch on my local configuration and can confirm that it fixes the issue
> > of send with invalidate being improperly mapped between a user-space process
> > and the kernel rxe driver.
> > 
> > Thanks again for your time and help.
> > 
> > Seth Howell
> > 
> > From: linux-rdma-owner@...r.kernel.org [mailto:
> > linux-rdma-owner@...r.kernel.org] On Behalf Of Jason Gunthorpe
> > Sent: Thursday, August 16, 2018 11:01 AM
> > To: Howell, Seth <seth.howell@...el.com>
> > Cc: Walker, Benjamin <benjamin.walker@...el.com>; Doug Ledford <
> > dledford@...hat.com>; linux-rdma@...r.kernel.org; linux-kernel@...r.kernel.org
> > ; Moni Shoua <monis@...lanox.com>
> > Subject: Re: [PATCH] rdma: move the ib_wr_opcode enum to include/uapi
> > 
> > On Wed, Aug 15, 2018 at 11:27:36PM +0000, Howell, Seth wrote:
> > 
> > > Thank you for taking the time to review this issue. The patch you 
> > > submitted will definitely fix the problem I was facing.
> > 
> > Can you test it to be certain?
> > 
> > Thanks,
> > Jason
> 
> We've recently run into this same issue on i40iw, which appears to make the same
> mistake of using the kernel version of the enum instead of the userspace
> version. 

Confused by this?? i40iw_upost_send does not handle the kernel numbers
at all, as far as I can see? How does it develop a kernel dependency??

> What's the current status here? Can it be merged? I just checked and
> do not see it merged to Linux master.

Oh! This apparently got lost, thanks for bringing it up again.

> Running a user-space NVMe-oF target with RDMA and a recent Linux kernel
> initiator is not currently possible on rxe or i40iw because it requires send
> with invalidate support.

Okay, but i40iw doesn't seem to support send with invalidate at all in
userspace?

i40iw_upost_send() swithces on opcode, doesn't handle SEND_INV and
then blows up in the default clause - how does this patch make any
difference???

Jason