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Date:   Wed, 19 Aug 2020 13:35:22 -0700
From:   Yonghong Song <>
To:     Lorenz Bauer <>, <>,
        <>, Alexei Starovoitov <>,
        Daniel Borkmann <>,
        "David S. Miller" <>,
        Jakub Kicinski <>
CC:     <>, <>,
        <>, <>
Subject: Re: [PATCH bpf-next 5/6] bpf: sockmap: allow update from BPF

On 8/19/20 2:24 AM, Lorenz Bauer wrote:
> Allow calling bpf_map_update_elem on sockmap and sockhash from a BPF
> context. The synchronization required for this is a bit fiddly: we
> need to prevent the socket from changing it's state while we add it
> to the sockmap, since we rely on getting a callback via
> sk_prot->unhash. However, we can't just lock_sock like in
> sock_map_sk_acquire because that might sleep. So instead we disable
> softirq processing and use bh_lock_sock to prevent further
> modification.
> Signed-off-by: Lorenz Bauer <>

Acked-by: Yonghong Song <>

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