linux-kernel - Re: [PATCH AUTOSEL 5.11 10/38] net: correct sk_acceptq_is

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Date:   Wed, 31 Mar 2021 22:56:20 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        liuyacan <yacanliu@....com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.11 10/38] net: correct sk_acceptq_is_full()

On Wed, Mar 31, 2021 at 06:17:27PM +0200, Eric Dumazet wrote:
>
>
>On 3/30/21 12:21 AM, Sasha Levin wrote:
>> From: liuyacan <yacanliu@....com>
>>
>> [ Upstream commit f211ac154577ec9ccf07c15f18a6abf0d9bdb4ab ]
>>
>> The "backlog" argument in listen() specifies
>> the maximom length of pending connections,
>> so the accept queue should be considered full
>> if there are exactly "backlog" elements.
>>
>> Signed-off-by: liuyacan <yacanliu@....com>
>> Signed-off-by: David S. Miller <davem@...emloft.net>
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>> ---
>>  include/net/sock.h | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/include/net/sock.h b/include/net/sock.h
>> index 129d200bccb4..a95f38a4b8c6 100644
>> --- a/include/net/sock.h
>> +++ b/include/net/sock.h
>> @@ -936,7 +936,7 @@ static inline void sk_acceptq_added(struct sock *sk)
>>
>>  static inline bool sk_acceptq_is_full(const struct sock *sk)
>>  {
>> -	return READ_ONCE(sk->sk_ack_backlog) > READ_ONCE(sk->sk_max_ack_backlog);
>> +	return READ_ONCE(sk->sk_ack_backlog) >= READ_ONCE(sk->sk_max_ack_backlog);
>>  }
>>
>>  /*
>>
>
>
>????
>
>I have not seen this patch going in our trees.
>
>First, there was no Fixes: tag, so this is quite unfortunate.
>
>Second, we already had such wrong patches in the past.
>
>Please look at commits
>64a146513f8f12ba204b7bf5cb7e9505594ead42 [NET]: Revert incorrect accept queue backlog changes.
>8488df894d05d6fa41c2bd298c335f944bb0e401 [NET]: Fix bugs in "Whether sock accept queue is full" checking
>
>Please revert  this patch, thanks !

Dropped, thanks for letting me know!

-- 
Thanks,
Sasha