From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Lorenzo Bianconi <lorenzo@kernel.org>
Cc: bpf@vger.kernel.org, netdev@vger.kernel.org,
lorenzo.bianconi@redhat.com, davem@davemloft.net,
kuba@kernel.org, ast@kernel.org, daniel@iogearbox.net,
dsahern@kernel.org, komachi.yoshiki@gmail.com, brouer@redhat.com,
memxor@gmail.com, andrii.nakryiko@gmail.com
Subject: Re: [RFC bpf-next 1/2] net: bridge: add unstable br_fdb_find_port_from_ifindex helper
Date: Wed, 26 Jan 2022 13:03:56 +0100 [thread overview]
Message-ID: <87bkzy3dqr.fsf@toke.dk> (raw)
In-Reply-To: <YfEzl0wL+51wa6z7@lore-desk>
Lorenzo Bianconi <lorenzo@kernel.org> writes:
>> > + rcu_read_lock();
>>
>> This is not needed when the function is only being called from XDP...
>
> don't we need it since we do not hold the rtnl here?
No. XDP programs always run under local_bh_disable() which "counts" as
an rcu_read_lock(); I did some cleanup around this a while ago, see this
commit for a longer explanation:
782347b6bcad ("xdp: Add proper __rcu annotations to redirect map entries")
-Toke
next prev parent reply other threads:[~2022-01-26 12:04 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-24 17:20 [RFC bpf-next 0/2] introduce bpf fdb lookup helper for xdp Lorenzo Bianconi
2022-01-24 17:20 ` [RFC bpf-next 1/2] net: bridge: add unstable br_fdb_find_port_from_ifindex helper Lorenzo Bianconi
2022-01-24 17:50 ` Toke Høiland-Jørgensen
2022-01-26 11:42 ` Lorenzo Bianconi
2022-01-26 12:03 ` Kumar Kartikeya Dwivedi
2022-01-26 20:11 ` Andrii Nakryiko
2022-01-26 12:03 ` Toke Høiland-Jørgensen [this message]
2022-01-26 14:04 ` Lorenzo Bianconi
2022-01-24 18:32 ` Nikolay Aleksandrov
2022-01-25 5:09 ` Alexei Starovoitov
2022-01-26 11:09 ` Lorenzo Bianconi
2022-01-26 12:02 ` Toke Høiland-Jørgensen
2022-01-26 11:27 ` Lorenzo Bianconi
2022-01-26 12:08 ` Kumar Kartikeya Dwivedi
2022-01-26 12:39 ` Nikolay Aleksandrov
2022-01-26 12:50 ` Toke Høiland-Jørgensen
2022-01-26 12:57 ` Nikolay Aleksandrov
2022-01-26 15:00 ` Lorenzo Bianconi
2022-01-24 17:20 ` [RFC bpf-next 2/2] samples: bpf: add xdp fdb lookup program Lorenzo Bianconi
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