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Tue, 17 Feb 2026 06:32:52 -0800 (PST) Received: from localhost.localdomain ([49.207.200.244]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-824c6b935c6sm14770821b3a.47.2026.02.17.06.32.45 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 17 Feb 2026 06:32:51 -0800 (PST) From: Anand Kumar Shaw To: bpf@vger.kernel.org, netdev@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, hawk@kernel.org, john.fastabend@gmail.com, davem@davemloft.net, kuba@kernel.org, sdf@fomichev.me, edumazet@google.com, pabeni@redhat.com, horms@kernel.org, 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, linux-kernel@vger.kernel.org, Anand Kumar Shaw Subject: [PATCH 0/2] xdp: propagate rx queue_index through xdp_frame Date: Tue, 17 Feb 2026 20:02:40 +0530 Message-Id: <20260217143242.4404-1-anandkrshawheritage@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When an XDP frame is redirected via cpumap or devmap, the original RX queue index is lost. BPF programs running on the second-stage (SEC("xdp/cpumap") or SEC("xdp/devmap")) always see ctx->rx_queue_index as 0, and SKBs built from xdp_frame lack proper RX queue metadata. This series adds a queue_index field to struct xdp_frame, populates it during the xdp_buff to xdp_frame conversion (both normal and zero-copy paths), and consumes it in cpumap and devmap when reconstructing xdp_rxq_info. It also calls skb_record_rx_queue() in __xdp_build_skb_from_frame(), resolving a documented gap. Patch 1 adds the field and populates it in the conversion paths. Patch 2 sets rxq.queue_index in cpumap and devmap, resolving a TODO left since the original cpumap implementation. struct xdp_frame grows by 4 bytes (40 -> 44 bytes), still within a single 64-byte cacheline. Anand Kumar Shaw (2): xdp: propagate queue_index through xdp_frame bpf: report queue_index to xdp_rxq_info in cpumap and devmap include/net/xdp.h | 2 ++ kernel/bpf/cpumap.c | 2 +- kernel/bpf/devmap.c | 1 + net/core/xdp.c | 3 ++- 4 files changed, 6 insertions(+), 2 deletions(-) -- 2.39.5 (Apple Git-154)