linux-kernel - Re: [PATCH rdma-next 00/13] Add RDMA inline crypto support

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Message-ID: <c3c636b4-b46b-ddab-6446-bc55349a96e3@grimberg.me>
Date:   Tue, 14 Feb 2023 12:01:15 +0200
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Max Gurtovoy <mgurtovoy@...dia.com>, Christoph Hellwig <hch@....de>
Cc:     Leon Romanovsky <leon@...nel.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Bryan Tan <bryantan@...are.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Israel Rukshin <israelr@...dia.com>,
        Jakub Kicinski <kuba@...nel.org>, Jens Axboe <axboe@...com>,
        Keith Busch <kbusch@...nel.org>, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>, netdev@...r.kernel.org,
        Paolo Abeni <pabeni@...hat.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Selvin Xavier <selvin.xavier@...adcom.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Vishnu Dasa <vdasa@...are.com>,
        Yishai Hadas <yishaih@...dia.com>
Subject: Re: [PATCH rdma-next 00/13] Add RDMA inline crypto support


>>> Today, if one would like to run both features using a capable device 
>>> then
>>> the PI will be offloaded (no SW fallback) and the Encryption will be 
>>> using
>>> SW fallback.
>> It's not just running both - it's offering both as currently registering
>> these fatures is mutally incompatible.
> 
> For sure we would like to offer both, but as mentioned before, this will 
> require blk layer instrumentation and ib_core instrumentation to some 
> pipeline_mr or something like that.

Can you explain what is needed in the block layer that prevents queueing
a request that has PI and crypto ctx?

As for the rdma portion, I don't know enough if this is something
that is supported by the HW and lacks a SW interface, or inherently
unsupported in HW...