From: Stefan Metzmacher <metze@samba.org>
To: David Howells <dhowells@redhat.com>
Cc: smfrench@gmail.com, tom@talpey.com,
Long Li <longli@microsoft.com>,
Namjae Jeon <linkinjeon@kernel.org>,
linux-cifs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] cifs: Fix problem with encrypted RDMA data read
Date: Wed, 16 Nov 2022 10:05:11 +0100 [thread overview]
Message-ID: <88b441af-d6ae-4d46-aae5-0b649e76031d@samba.org> (raw)
In-Reply-To: <2147870.1668582019@warthog.procyon.org.uk>
Am 16.11.22 um 08:00 schrieb David Howells:
> Stefan Metzmacher <metze@samba.org> wrote:
>
>> I'm not sure I understand why this would fix anything when encryption is
>> enabled.
>>
>> Is the payload still be offloaded as plaintext? Otherwise we wouldn't have
>> use_rdma_mr... So this rather looks like a fix for the non encrypted case.
>
> The "inline"[*] PDUs are encrypted, but the direct RDMA data transmission is
> not. I'm not sure if this is a bug in ksmbd.
It's a bug in the client!
> As I understand it, encrypting and decrypting the directly transferred
> data would need to be done by the NIC, not the cifs driver.
No, the encryption needs to happen above the RDMA/NIC layer.
metze
next prev parent reply other threads:[~2022-11-16 9:05 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-15 22:44 [PATCH] cifs: Fix problem with encrypted RDMA data read David Howells
2022-11-16 0:57 ` Stefan Metzmacher
2022-11-16 5:19 ` Namjae Jeon
2022-11-16 8:36 ` Stefan Metzmacher
2022-11-16 15:41 ` Tom Talpey
2022-11-16 15:44 ` Stefan Metzmacher
2022-11-16 16:14 ` Tom Talpey
2022-11-16 19:53 ` Stefan Metzmacher
2022-11-16 21:21 ` Tom Talpey
2022-11-16 16:44 ` David Howells
2022-11-16 7:00 ` David Howells
2022-11-16 9:05 ` Stefan Metzmacher [this message]
2022-11-16 12:14 ` David Howells
2022-11-16 12:53 ` Stefan Metzmacher
2022-11-16 13:09 ` David Howells
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