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

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Date:   Mon, 30 Jan 2023 13:36:10 +0100
From:   Christoph Hellwig <hch@....de>
To:     Israel Rukshin <israelr@...dia.com>
Cc:     Sagi Grimberg <sagi@...mberg.me>,
        Leon Romanovsky <leon@...nel.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Bryan Tan <bryantan@...are.com>,
        Christoph Hellwig <hch@....de>,
        Eric Dumazet <edumazet@...gle.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>,
        Max Gurtovoy <mgurtovoy@...dia.com>, 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

On Mon, Jan 23, 2023 at 02:57:18PM +0200, Israel Rukshin wrote:
>> - what happens with multipathing? when if not all devices are
>> capable. SW fallback?
> SW fallback happens every time the device doesn't support the specific 
> crypto request (which include data-unit-size, mode and dun_bytes).
> So with multipathing, one path uses the HW crypto offload and the other one 
> uses the SW fallback.

That's a big no-go.  The blk-crypto-fallback code is just a toy example
and not actually safe to use in prodution.  Most importantly it just
kmallocs a bio clone and pages for it without any mempool that guarantees
forward progress.