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Date:   Thu, 12 May 2022 14:01:33 -0700
From:   Eric Dumazet <>
To:     Martin KaFai Lau <>
Cc:     netdev <>,
        David Miller <>,
        Jakub Kicinski <>,
        kernel-team <>, Paolo Abeni <>
Subject: Re: [PATCH net-next 0/4] net: inet: Retire port only listening_hash

On Wed, May 11, 2022 at 5:05 PM Martin KaFai Lau <> wrote:
> This series is to retire the port only listening_hash.
> The listen sk is currently stored in two hash tables,
> listening_hash (hashed by port) and lhash2 (hashed by port and address).
> After commit 0ee58dad5b06 ("net: tcp6: prefer listeners bound to an address")
> and commit d9fbc7f6431f ("net: tcp: prefer listeners bound to an address"),
> the TCP-SYN lookup fast path does not use listening_hash.
> The commit 05c0b35709c5 ("tcp: seq_file: Replace listening_hash with lhash2")
> also moved the seq_file (/proc/net/tcp) iteration usage from
> listening_hash to lhash2.
> There are still a few listening_hash usages left.
> One of them is inet_reuseport_add_sock() which uses the listening_hash
> to search a listen sk during the listen() system call.  This turns
> out to be very slow on use cases that listen on many different
> VIPs at a popular port (e.g. 443).  [ On top of the slowness in
> adding to the tail in the IPv6 case ]. A latter patch has a
> selftest to demonstrate this case.
> This series takes this chance to move all remaining listening_hash
> usages to lhash2 and then retire listening_hash.
> Martin KaFai Lau (4):
>   net: inet: Remove count from inet_listen_hashbucket
>   net: inet: Open code inet_hash2 and inet_unhash2
>   net: inet: Retire port only listening_hash
>   net: selftests: Stress reuseport listen

Nice patches, thanks Martin.

Reviewed-by: Eric Dumazet <>

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