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Thu, 25 Sep 2025 02:55:03 -0700 (PDT) Received: from [192.168.1.105] ([165.50.112.244]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-634a3ae31cfsm919842a12.33.2025.09.25.02.55.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 25 Sep 2025 02:55:02 -0700 (PDT) Message-ID: <0cddb596-a70b-48d4-9d8e-c6cb76abd9d2@gmail.com> Date: Thu, 25 Sep 2025 11:54:59 +0100 Precedence: bulk X-Mailing-List: linux-kernel-mentees@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 0/4] Add XDP RX queue index metadata via kfuncs To: Jakub Sitnicki Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, donald.hunter@gmail.com, andrew+netdev@lunn.ch, ast@kernel.org, daniel@iogearbox.net, hawk@kernel.org, john.fastabend@gmail.com, matttbe@kernel.org, chuck.lever@oracle.com, jdamato@fastly.com, skhawaja@google.com, dw@davidwei.uk, mkarsten@uwaterloo.ca, yoong.siang.song@intel.com, david.hunter.linux@gmail.com, skhan@linuxfoundation.org, horms@kernel.org, sdf@fomichev.me, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org References: <20250923210026.3870-1-mehdi.benhadjkhelifa@gmail.com> <87h5wq50l0.fsf@cloudflare.com> Content-Language: en-US From: Mehdi Ben Hadj Khelifa In-Reply-To: <87h5wq50l0.fsf@cloudflare.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 9/25/25 10:43 AM, Jakub Sitnicki wrote: > On Tue, Sep 23, 2025 at 10:00 PM +01, Mehdi Ben Hadj Khelifa wrote: >> This patch series is intended to make a base for setting >> queue_index in the xdp_rxq_info struct in bpf/cpumap.c to >> the right index. Although that part I still didn't figure >> out yet,I m searching for my guidance to do that as well >> as for the correctness of the patches in this series. > > What is the use case/movtivation behind this work? The goal of the work is to have xdp programs have the correct packet RX queue index after being redirected through cpumap because currently the queue_index gets unset or more accurately set to 0 as a default in xdp_rxq_info. This is my current understanding.I still have to know how I can propogate that HW hint from the NICs to the function where I need it. Regards, Mehdi