Re: [PATCH bpf-next v5 0/6] Support direct writes to nf_conn:mark

[Kumar Kartikeya Dwivedi]

On Wed, 7 Sept 2022 at 18:41, Daniel Xu <dxu@xxxxxxxxx> wrote:
>
> Support direct writes to nf_conn:mark from TC and XDP prog types. This
> is useful when applications want to store per-connection metadata. This
> is also particularly useful for applications that run both bpf and
> iptables/nftables because the latter can trivially access this metadata.
>
> One example use case would be if a bpf prog is responsible for advanced
> packet classification and iptables/nftables is later used for routing
> due to pre-existing/legacy code.
>

There are a couple of compile time warnings when conntrack is disabled,

../net/core/filter.c:8608:1: warning: symbol 'nf_conn_btf_access_lock'
was not declared. Should it be static?
../net/core/filter.c:8611:5: warning: symbol 'nfct_bsa' was not
declared. Should it be static?

Most likely because extern declaration is guarded by ifdefs. So just
moving those out of ifdef should work.
I guess you can send that as a follow up fix, or roll it in if you end
up respinning.

Otherwise, for the series:
Acked-by: Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx>