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

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Message-ID: <f6e661b2-f2f8-1747-2180-b7e6aa0b4bcd@nvidia.com>
Date:   Wed, 18 Jan 2023 10:58:02 +0200
From:   Israel Rukshin <israelr@...dia.com>
To:     Eric Biggers <ebiggers@...nel.org>,
        Leon Romanovsky <leon@...nel.org>
Cc:     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>,
        Sagi Grimberg <sagi@...mberg.me>,
        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

Hi Eric,

On 1/18/2023 8:47 AM, Eric Biggers wrote:
> Hi Leon,
>
> On Mon, Jan 16, 2023 at 03:05:47PM +0200, Leon Romanovsky wrote:
>> >From Israel,
>>
>> The purpose of this patchset is to add support for inline
>> encryption/decryption of the data at storage protocols like nvmf over
>> RDMA (at a similar way like integrity is used via unique mkey).
>>
>> This patchset adds support for plaintext keys. The patches were tested
>> on BF-3 HW with fscrypt tool to test this feature, which showed reduce
>> in CPU utilization when comparing at 64k or more IO size. The CPU utilization
>> was improved by more than 50% comparing to the SW only solution at this case.
>>
>> How to configure fscrypt to enable plaintext keys:
>>   # mkfs.ext4 -O encrypt /dev/nvme0n1
>>   # mount /dev/nvme0n1 /mnt/crypto -o inlinecrypt
>>   # head -c 64 /dev/urandom > /tmp/master_key
>>   # fscryptctl add_key /mnt/crypto/ < /tmp/master_key
>>   # mkdir /mnt/crypto/test1
>>   # fscryptctl set_policy 152c41b2ea39fa3d90ea06448456e7fb /mnt/crypto/test1
>>     ** “152c41b2ea39fa3d90ea06448456e7fb” is the output of the
>>        “fscryptctl add_key” command.
>>   # echo foo > /mnt/crypto/test1/foo
>>
>> Notes:
>>   - At plaintext mode only, the user set a master key and the fscrypt
>>     driver derived from it the DEK and the key identifier.
>>   - 152c41b2ea39fa3d90ea06448456e7fb is the derived key identifier
>>   - Only on the first IO, nvme-rdma gets a callback to load the derived DEK.
>>
>> There is no special configuration to support crypto at nvme modules.
>>
>> Thanks
> Very interesting work!  Can you Cc me on future versions?
>
> I'm glad to see that this hardware allows all 16 IV bytes to be specified.
>
> Does it also handle programming and evicting keys efficiently?
>
> Also, just checking: have you tested that the ciphertext that this inline
> encryption hardware produces is correct?  That's always super important to test.
> There are xfstests that test for it, e.g. generic/582.  Another way to test it
> is to just manually test whether encrypted files that were created when the
> filesystem was mounted with '-o inlinecrypt' show the same contents when the
> filesystem is *not* mounted with '-o inlinecrypt' (or vice versa).
sure, I ran the manual test of comparing the encrypted files content 
with and without the '-o inlinecrypt' at the mount command.
>
> - Eric
  - Israel