netdev - Re: [PATCH bpf-next/net 0/6] bpf: Allow opt-out from sk->sk_prot->memory

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Message-ID: <87ldlnfrf2.fsf@linux.dev>
Date: Mon, 06 Oct 2025 18:10:09 -0700
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: Kuniyuki Iwashima <kuniyu@...gle.com>
Cc: Alexei Starovoitov <ast@...nel.org>,  Andrii Nakryiko
 <andrii@...nel.org>,  Daniel Borkmann <daniel@...earbox.net>,  Martin
 KaFai Lau <martin.lau@...ux.dev>,  John Fastabend
 <john.fastabend@...il.com>,  Stanislav Fomichev <sdf@...ichev.me>,  "David
 S. Miller" <davem@...emloft.net>,  Eric Dumazet <edumazet@...gle.com>,
  Jakub Kicinski <kuba@...nel.org>,  Paolo Abeni <pabeni@...hat.com>,  Neal
 Cardwell <ncardwell@...gle.com>,  Willem de Bruijn <willemb@...gle.com>,
  Mina Almasry <almasrymina@...gle.com>,  Kuniyuki Iwashima
 <kuni1840@...il.com>,  bpf@...r.kernel.org,  netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next/net 0/6] bpf: Allow opt-out from
 sk->sk_prot->memory_allocated.

Kuniyuki Iwashima <kuniyu@...gle.com> writes:

> This series allows opting out of the global per-protocol memory
> accounting if socket is configured as such by sysctl or BPF prog.
>
> This series is v11 of the series below [0], but I start as a new series
> because the changes now fall in net and bpf subsystems only.
>
> I discussed with Roman Gushchin offlist, and he suggested not mixing
> two independent subsystems and it would be cleaner not to depend on
> memcg.
>
> So, sk->sk_memcg and memcg code are no longer touched, and instead we
> use another hole near sk->sk_prot to store a flag for the net feature.
>
> Overview of the series:
>
>   patch 1 is misc cleanup
>   patch 2 allows opt-out from sk->sk_prot->memory_allocated
>   patch 3 introduces net.core.bypass_prot_mem
>   patch 4 & 5 supports flagging sk->sk_bypass_prot_mem via bpf_setsockopt()
>   patch 6 is selftest

Acked-by: Roman Gushchin <roman.gushchin@...ux.dev>
for the series.

Thanks!