netdev - Re: pull-request: bpf-next 2025-09-23

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Message-ID: <20250924172924.72c85b24@kernel.org>
Date: Wed, 24 Sep 2025 17:29:24 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Martin KaFai Lau <martin.lau@...ux.dev>
Cc: Amery Hung <ameryhung@...il.com>, David Miller <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Alexei
 Starovoitov <ast@...nel.org>, Andrii Nakryiko <andrii@...nel.org>, Daniel
 Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
 bpf@...r.kernel.org
Subject: Re: pull-request: bpf-next 2025-09-23

On Wed, 24 Sep 2025 17:09:52 -0700 Martin KaFai Lau wrote:
> On 9/24/25 3:18 PM, Jakub Kicinski wrote:
> > 74: (15) if r1 == 0x20 goto pc+309 384: frame1: R0=map_value(map=map_xdp_setup,ks=4,vs=4) R1=32 R2=0xfffffeff R3=scalar(smin=0xffffffff80000000,smax=0x7fffffff) R4=16 R5=1 R6=2 R7=ctx() R8=pkt(off=34,r=42) R9=scalar() R10=fp0 fp-336=mmmmmmmm
> > ; switch (*val) { @ xdp_native.bpf.c:594
> > 384: (b7) r4 = 32                     ; frame1: R4_w=32
> > 385: (05) goto pc+1
> > 387: (7b) *(u64 *)(r10 -352) = r5     ; frame1: R5=1 R10=fp0 fp-352_w=1
> > 388: (1f) r8 -= r9  
> 
> The "hdr_len = (void *)udph_ptr - data + sizeof(struct udphdr);" calculation 
> needs to reload the ctx->data after filter_udphdr(). Amery will send a fix.

Phew! no compiler update needed :) Thank you!