From: Vadim Fedorenko <vadim.fedorenko@linux.dev>
To: Jakub Kicinski <kuba@kernel.org>
Cc: Vadim Fedorenko <vadfed@meta.com>,
Martin KaFai Lau <martin.lau@linux.dev>,
Andrii Nakryiko <andrii@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Mykola Lysenko <mykolal@fb.com>,
bpf@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH bpf-next 1/2] bpf: add skcipher API support to TC/XDP programs
Date: Fri, 27 Oct 2023 18:02:54 +0100 [thread overview]
Message-ID: <b3f421b5-e9e2-4719-8529-56f2a0cf1cdf@linux.dev> (raw)
In-Reply-To: <20231026183509.471af050@kernel.org>
On 27/10/2023 02:35, Jakub Kicinski wrote:
> On Fri, 27 Oct 2023 00:29:29 +0100 Vadim Fedorenko wrote:
>>> Does anything prevent them from being used simultaneously
>>> by difference CPUs?
>>
>> The algorithm configuration and the key can be used by different CPUs
>> simultaneously
>
> Makes sense, got confused ctx vs req. You allocate req on the fly.
>
>>>> + case BPF_DYNPTR_TYPE_SKB:
>>>> + return skb_pointer_if_linear(ptr->data, ptr->offset, __bpf_dynptr_size(ptr));
>>>
>>> dynptr takes care of checking if skb can be written to?
>>
>> dynptr is used to take care of size checking, but this particular part is used
>> to provide plain buffer from skb. I'm really sure if we can (or should) encrypt
>> or decrypt in-place, so API now assumes that src and dst are different buffers.
>
> Not sure this answers my question. What I'm asking is basically whether
> for destination we need to call __bpf_dynptr_is_rdonly() or something
> already checks that.
Well, I actually went to simpler implementation. As it's only needed for
dst buffer, move __bpf_dynptr_is_rdonly to helpers and use it to check
dst only and break earlier in case of error. If there will be other
customers of __bpf_dynptr_data_ptr helper, I'll implement it other way.
next prev parent reply other threads:[~2023-10-27 17:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-26 1:59 [PATCH bpf-next 1/2] bpf: add skcipher API support to TC/XDP programs Vadim Fedorenko
2023-10-26 1:59 ` [PATCH bpf-next 2/2] selftests: bpf: crypto skcipher algo selftests Vadim Fedorenko
2023-10-26 14:02 ` Daniel Borkmann
2023-10-26 18:20 ` Vadim Fedorenko
2023-10-26 21:47 ` [PATCH bpf-next 1/2] bpf: add skcipher API support to TC/XDP programs Jakub Kicinski
2023-10-26 23:29 ` Vadim Fedorenko
2023-10-27 1:35 ` Jakub Kicinski
2023-10-27 12:07 ` Vadim Fedorenko
2023-10-27 17:02 ` Vadim Fedorenko [this message]
2023-10-26 22:53 ` Alexei Starovoitov
2023-10-26 23:38 ` Vadim Fedorenko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=b3f421b5-e9e2-4719-8529-56f2a0cf1cdf@linux.dev \
--to=vadim.fedorenko@linux.dev \
--cc=andrii@kernel.org \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=kuba@kernel.org \
--cc=martin.lau@linux.dev \
--cc=mykolal@fb.com \
--cc=netdev@vger.kernel.org \
--cc=vadfed@meta.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).