Hi all, On the RHEL9.2 with DPDK 22.11.1 version, DPDK primary application failed to add RSS flow on TAP sub-device, when loading the TAP BPF byte-code instructions.
This "struct bpf_insn l3_l4_hash_insns[]" array(from file: drivers/net/tap/tap_bpf_insns.h) is in eBPF bytecode instructions format, this eBPF failed to load on TAP PMD with the following error: ===================== rss_add_actions(): Failed to load BPF section 'l3_l4' (7): Argument list too long. net_failsafe: Failed to create a flow on sub_device 1." ===================== On Kernel-version: 5.15.0 #9 SMP PREEMPT Arch: x86_64 GNU/Linux When added some debug logs on Kernel BPF verifier code, we could see that instruction processed were reached to 1 Million. But, the Byte code has only 1698 instructions only. Why the Kernel BPF verifier is processing beyond 1,698 instructions ? The same byte-code(with DPDK-22.11.1) worked well with RHEL8.x and not working in RHEL-9.x version. Does anybody faced such issues ? Please let me know how to debug such issues on Byte-code. Thanks, Madhukar.
