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Subject: Re: [PATCH 13/23] io_uring: implement bpf prog registration
To:     Song Liu <songliubraving@fb.com>
Cc:     "io-uring@vger.kernel.org" <io-uring@vger.kernel.org>,
        Networking <netdev@vger.kernel.org>,
        "bpf@vger.kernel.org" <bpf@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Jens Axboe <axboe@kernel.dk>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Andrii Nakryiko <andrii@kernel.org>, Martin Lau <kafai@fb.com>,
        Yonghong Song <yhs@fb.com>,
        John Fastabend <john.fastabend@gmail.com>,
        KP Singh <kpsingh@kernel.org>,
        Horst Schirmeier <horst.schirmeier@tu-dortmund.de>,
        "Franz-B . Tuneke" <franz-bernhard.tuneke@tu-dortmund.de>,
        Christian Dietrich <stettberger@dokucode.de>
References: <cover.1621424513.git.asml.silence@gmail.com>
 <c246d3736b9440532f3e82199a616e3f74d1b8ba.1621424513.git.asml.silence@gmail.com>
 <E5C654FA-1F38-43C4-940D-80563A3B2647@fb.com>
From:   Pavel Begunkov <asml.silence@gmail.com>
Message-ID: <2ae0fcbf-fe4a-b2e6-5e7a-4f62c8e91d7e@gmail.com>
Date:   Fri, 21 May 2021 01:43:30 +0100
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On 5/21/21 12:45 AM, Song Liu wrote:
>> On May 19, 2021, at 7:13 AM, Pavel Begunkov <asml.silence@gmail.com> wrote:
>>
>> [de]register BPF programs through io_uring_register() with new
>> IORING_ATTACH_BPF and IORING_DETACH_BPF commands.
>>
>> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
>> ---
>> fs/io_uring.c                 | 81 +++++++++++++++++++++++++++++++++++
>> include/uapi/linux/io_uring.h |  2 +
>> 2 files changed, 83 insertions(+)
>>
>> diff --git a/fs/io_uring.c b/fs/io_uring.c
>> index 882b16b5e5eb..b13cbcd5c47b 100644
>> --- a/fs/io_uring.c
>> +++ b/fs/io_uring.c
>> @@ -78,6 +78,7 @@
>> #include <linux/task_work.h>
>> #include <linux/pagemap.h>
>> #include <linux/io_uring.h>
>> +#include <linux/bpf.h>
>>
>> #define CREATE_TRACE_POINTS
>> #include <trace/events/io_uring.h>
>> @@ -103,6 +104,8 @@
>> #define IORING_MAX_RESTRICTIONS	(IORING_RESTRICTION_LAST + \
>> 				 IORING_REGISTER_LAST + IORING_OP_LAST)
>>
>> +#define IORING_MAX_BPF_PROGS	100
> 
> Is 100 a realistic number here? 

Arbitrary test value, will update

> 
>> +
>> #define SQE_VALID_FLAGS	(IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK|	\
>> 				IOSQE_IO_HARDLINK | IOSQE_ASYNC | \
>> 				IOSQE_BUFFER_SELECT)
>> @@ -266,6 +269,10 @@ struct io_restriction {
>> 	bool registered;
>> };
>>
> 
> [...]
> 

-- 
Pavel Begunkov