linux-kernel - Re: [PATCH v2 8/8] ib_uverbs: Support for kernel implementation of XRC

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Message-ID: <20160916193102.GB28859@obsidianresearch.com>
Date:   Fri, 16 Sep 2016 13:31:03 -0600
From:   Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:     Knut Omang <knut.omang@...cle.com>
Cc:     Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        Matan Barak <matanb@...lanox.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Leon Romanovsky <leonro@...lanox.com>,
        Yishai Hadas <yishaih@...lanox.com>,
        Majd Dibbiny <majd@...lanox.com>,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Or Gerlitz <ogerlitz@...lanox.com>
Subject: Re: [PATCH v2 8/8] ib_uverbs: Support for kernel implementation of
 XRC

On Fri, Sep 16, 2016 at 08:31:19PM +0200, Knut Omang wrote:
> +++ b/include/uapi/rdma/ib_user_verbs.h
> @@ -725,6 +725,8 @@ struct ib_uverbs_send_wr {
>  			__u32 reserved;
>  		} ud;
>  	} wr;
> +	__u32 xrc_remote_srq_num;
> +	__u32 reserved;
>  };

You still need to discuss why this is OK...

Are you doing all this just to be able to use the existing post_send user
space path in the common code? Is there a kernel XRC user planned?

Another approach would be to implement post_send in your driver and
not rely on this common code path.

Jason