Messages in this thread | | | Subject | Re: [PATCH bpf-next 5/6] bpf: sockmap: allow update from BPF | From | Yonghong Song <> | Date | Wed, 19 Aug 2020 13:35:22 -0700 |
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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 <lmb@cloudflare.com>
Acked-by: Yonghong Song <yhs@fb.com>
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