Re: [PATCH net-next V2 0/5] selftests: drv-net: Test XDP native support

[Jakub Kicinski <kuba@kernel.org>]

On Thu, 10 Jul 2025 11:43:46 -0700 Mohsin Bashir wrote:
> This patch series add tests to validate XDP native support for PASS,
> DROP, ABORT, and TX actions, as well as headroom and tailroom adjustment.
> For adjustment tests, validate support for both the extension and
> shrinking cases across various packet sizes and offset values.

The program does not load in the CI :(

509: (15) if r1 == 0x0 goto pc+142    ; frame1: R1=scalar(smin=umin=umin32=1,smax=umax=0xffffffff,var_off=(0x0; 0xffffffff))
510: (25) if r1 > 0x100 goto pc+141   ; frame1: R1=scalar(smin=umin=smin32=umin32=1,smax=umax=smax32=umax32=256,var_off=(0x0; 0x1ff))
511: (bf) r3 = r10                    ; frame1: R3_w=fp0 R10=fp0\n; if (bpf_xdp_load_bytes(ctx, 0, tmp_buff, hdr_len) < 0) @ xdp_native.bpf.c:377
512: (07) r3 += -256                  ; frame1: R3_w=fp-256
513: (bf) r1 = r7                     ; frame1: R1_w=ctx() R7=ctx()
514: (b7) r2 = 0                      ; frame1: R2_w=0
515: (bf) r4 = r8                     ; frame1: R4_w=scalar(id=3) R8=scalar(id=3)
516: (7b) *(u64 *)(r10 -280) = r5     ; frame1: R5=32 R10=fp0 fp-280_w=32
517: (85) call bpf_xdp_load_bytes#189
R4 min value is negative, either use unsigned or 'var &= const'
processed 262 insns (limit 1000000) max_states_per_insn 1 total_states 26 peak_states 26 mark_read 7
-- END PROG LOAD LOG

I suppose it may be due to compiler version:
$ clang --version
clang version 15.0.7 (AWS 15.0.7-3.amzn2023.0.4)

LMK if you need more info / can't repro, but I think the suggestion
makes sense?