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([2a01:4b00:bd21:4f00:7cc6:d3ca:494:116c]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43783e0196bsm6653831f8f.23.2026.02.11.10.58.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Feb 2026 10:58:41 -0800 (PST) Message-ID: <1e797bda-a74b-4873-9bfe-f7a6a6263dd0@gmail.com> Date: Wed, 11 Feb 2026 18:58:42 +0000 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH io_uring-7.1 v5 0/5] BPF controlled io_uring To: Jens Axboe , io-uring@vger.kernel.org Cc: bpf@vger.kernel.org, Alexei Starovoitov References: <90c1f09e-9334-4036-a6be-ad7d2f91bfc7@kernel.dk> Content-Language: en-US From: Pavel Begunkov In-Reply-To: <90c1f09e-9334-4036-a6be-ad7d2f91bfc7@kernel.dk> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/11/26 15:24, Jens Axboe wrote: > On 2/11/26 7:32 AM, Pavel Begunkov wrote: ... >> It might need more specialised kfuncs in the future, but the core >> functionality is implemented with just two simple functions. One >> returns region memory, which gives BPF access to CQ/SQ/etc. And >> the second is for submitting requests. It's also given a structure >> as an argument, which is used to pass waiting parameters. >> >> It showed good numbers in a test that sequentially executes N nop >> requests, where BPF was more than twice as fast than a 2-nop >> request link implementation. >> >> I've got ideas on how the user space part while writing toy programs, >> mostly about simplifying life to BPF writers, but I want to turn it >> into something more cohesive before posting. > > This looks nifty. Do you have a repo on the liburing side with some > examples to play with? Nope, it's all in a pretty dirty state yet. The selftest is pretty good in that regard, it show cases a fixed QD workload. It's easy to convert it to reads, and that works well, but I guess I need to add something to show how to use the memory region to pass parameters, e.g. iovs to readv reqs. -- Pavel Begunkov