[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20230130123610.GB19948@lst.de>
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.
Powered by blists - more mailing lists