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Tue, 21 Oct 2025 03:14:02 -0700 (PDT) Message-ID: <4c849c04-6647-432c-807c-5fa7afa7fb47@gmail.com> Date: Tue, 21 Oct 2025 12:13:52 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH bpf-next v2] bpf/cpumap.c: Remove unnecessary TODO comment To: Jesper Dangaard Brouer , ast@kernel.org, daniel@iogearbox.net, davem@davemloft.net, kuba@kernel.org, john.fastabend@gmail.com, sdf@fomichev.me, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, kpsingh@kernel.org, haoluo@google.com, jolsa@kernel.org Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, skhan@linuxfoundation.org, david.hunter.linux@gmail.com, khalid@kernel.org, linux-kernel-mentees@lists.linuxfoundation.org References: <20251020170254.14622-1-mehdi.benhadjkhelifa@gmail.com> Content-Language: en-US From: Mehdi Ben Hadj Khelifa In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 10/21/25 10:37 AM, Jesper Dangaard Brouer wrote: > > > On 20/10/2025 19.02, Mehdi Ben Hadj Khelifa wrote: >> After discussion with bpf maintainers[1], queue_index could >> be propagated to the remote XDP program by the xdp_md struct[2] >> which makes this todo a misguide for future effort. >> >> [1]:https://lore.kernel.org/all/87y0q23j2w.fsf@cloudflare.com/ >> [2]:https://docs.ebpf.io/linux/helper-function/bpf_xdp_adjust_meta/ >> >> Signed-off-by: Mehdi Ben Hadj Khelifa >> --- >> Changelog: >> >> Changes from v1: >> >> -Added a comment to clarify that RX queue_index is lost after the frame >> redirection. >> >> Link:https://lore.kernel.org/bpf/d9819687-5b0d-4bfa-9aec- >> aef71b847383@gmail.com/T/#mcb6a0315f174d02db3c9bc4fa556cc939c87a706 >>   kernel/bpf/cpumap.c | 5 ++++- >>   1 file changed, 4 insertions(+), 1 deletion(-) >> >> diff --git a/kernel/bpf/cpumap.c b/kernel/bpf/cpumap.c >> index 703e5df1f4ef..6856a4a67840 100644 >> --- a/kernel/bpf/cpumap.c >> +++ b/kernel/bpf/cpumap.c >> @@ -195,7 +195,10 @@ static int cpu_map_bpf_prog_run_xdp(struct >> bpf_cpu_map_entry *rcpu, >>           rxq.dev = xdpf->dev_rx; >>           rxq.mem.type = xdpf->mem_type; >> -        /* TODO: report queue_index to xdp_rxq_info */ >> +        /* The NIC RX queue_index is lost after the frame redirection >> +         * but in case of need, it can be passed as a custom XDP >> +         * metadata via xdp_md struct to the remote XDP program > > Argh, saying XDP metadata is accessed via the xdp_md struct is just wrong. > Ack, I didn't clarify that XDP metadata should be propagated via the bpf_xdp_adjust_meta like mentionned in the link[2]... Maybe I was thinking more in the technical side that xdp_md->data_meta would hold the value internally... I will send a v3 with appropriate changes. Thanks for the review. Best Regards, Mehdi Ben Hadj Khelifa > Nacked-by: Jesper Dangaard Brouer > >> +         */ >>           xdp_convert_frame_to_buff(xdpf, &xdp); >