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Date:   Wed, 1 Feb 2023 05:39:43 -0800
From:   Christoph Hellwig <hch@infradead.org>
To:     Stefan Metzmacher <metze@samba.org>
Cc:     linux-cifs@vger.kernel.org, Steve French <smfrench@gmail.com>,
        Tom Talpey <tom@talpey.com>, Long Li <longli@microsoft.com>,
        Namjae Jeon <linkinjeon@kernel.org>,
        David Howells <dhowells@redhat.com>, stable@vger.kernel.org
Subject: Re: [PATCH 0/3] avoid plaintext rdma offset if encryption is required
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On Wed, Feb 01, 2023 at 01:04:40PM +0100, Stefan Metzmacher wrote:
> I think it is a security problem to send confidential data in plaintext
> over the wire, so we should avoid doing that even if rdma is in use.

Yep.

> Modern Windows servers support signed and encrypted rdma offload,
> but we don't support this yet...

There is a series out on the list for encryption offload to mlx5
hardware, whch is one way to handle this.  If not you need to bounce
buffer.