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Miller" , Jakub Kicinski Cc: netdev , Eric Dumazet , Eric Dumazet , iuyacan Subject: [PATCH net] Revert "net: correct sk_acceptq_is_full()" Date: Wed, 31 Mar 2021 09:35:12 -0700 Message-Id: <20210331163512.577893-1-eric.dumazet@gmail.com> X-Mailer: git-send-email 2.31.0.291.g576ba9dcdaf-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Eric Dumazet This reverts commit f211ac154577ec9ccf07c15f18a6abf0d9bdb4ab. We had similar attempt in the past, and we reverted it. History: 64a146513f8f12ba204b7bf5cb7e9505594ead42 [NET]: Revert incorrect accept queue backlog changes. 8488df894d05d6fa41c2bd298c335f944bb0e401 [NET]: Fix bugs in "Whether sock accept queue is full" checking I am adding a fat comment so that future attempts will be much harder. Fixes: f211ac154577 ("net: correct sk_acceptq_is_full()") Cc: iuyacan Signed-off-by: Eric Dumazet --- include/net/sock.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/include/net/sock.h b/include/net/sock.h index 3e3a5da2ce5aedbcfaca1880eb7c2e239c86b5ae..8487f58da36d21335f690edd2194986c3d4fed23 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -934,9 +934,13 @@ static inline void sk_acceptq_added(struct sock *sk) WRITE_ONCE(sk->sk_ack_backlog, sk->sk_ack_backlog + 1); } +/* Note: If you think the test should be: + * return READ_ONCE(sk->sk_ack_backlog) >= READ_ONCE(sk->sk_max_ack_backlog); + * Then please take a look at commit 64a146513f8f ("[NET]: Revert incorrect accept queue backlog changes.") + */ 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); } /*