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

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Date:   Wed, 19 Sep 2018 23:03:04 +0000
From:   "Nikolova, Tatyana E" <tatyana.e.nikolova@...el.com>
To:     Jason Gunthorpe <jgg@...pe.ca>,
        "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

Hi Jason,

> > What is the correct way for a user space application to check whether
> > a NIC supports SEND_WITH_INVAL? We are currently examining the
> > device_cap_flags in the structure returned by ibv_query_device.
> > Specifically, we're looking at IBV_DEVICE_MEM_MGT_EXTENSIONS.
> However,
> > for i40iw, that flag is set. I'm concerned that the feature support
> > flags are common between user space and the kernel, but the actual
> support differs in this case.
> 
> That is the correct thing to do. Sadly the i40iw driver is broken, it should be
> fixed to either mask those flags or implement the functionality.
> 

A fix to add SEND_WITH_INVAL support to the user space i40iw is coming.
It is currently in regression testing.

Thank you,
Tatyana 

> Jason