From ef547f2ac16bd9d77a780a0e7c70857e69e8f23f Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Fri, 2 Oct 2015 11:43:37 -0700 Subject: [PATCH] tcp: remove max_qlen_log This control variable was set at first listen(fd, backlog) call, but not updated if application tried to increase or decrease backlog. It made sense at the time listener had a non resizeable hash table. Also rounding to powers of two was not very friendly. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- include/net/inet_connection_sock.h | 2 +- include/net/request_sock.h | 10 ++-------- net/core/request_sock.c | 8 +------- net/ipv4/inet_connection_sock.c | 4 ++-- 4 files changed, 6 insertions(+), 18 deletions(-) diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h index 730aa034cd3d..3208a65d1c28 100644 --- a/include/net/inet_connection_sock.h +++ b/include/net/inet_connection_sock.h @@ -295,7 +295,7 @@ static inline int inet_csk_reqsk_queue_young(const struct sock *sk) static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk) { - return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue); + return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog; } void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req); diff --git a/include/net/request_sock.h b/include/net/request_sock.h index a66ab1345373..bae6936d75c4 100644 --- a/include/net/request_sock.h +++ b/include/net/request_sock.h @@ -157,7 +157,7 @@ struct fastopen_queue { struct request_sock_queue { spinlock_t rskq_lock; u8 rskq_defer_accept; - u8 max_qlen_log; + u32 synflood_warned; atomic_t qlen; atomic_t young; @@ -169,8 +169,7 @@ struct request_sock_queue { */ }; -void reqsk_queue_alloc(struct request_sock_queue *queue, - unsigned int nr_table_entries); +void reqsk_queue_alloc(struct request_sock_queue *queue); void reqsk_fastopen_remove(struct sock *sk, struct request_sock *req, bool reset); @@ -240,9 +239,4 @@ static inline int reqsk_queue_len_young(const struct request_sock_queue *queue) return atomic_read(&queue->young); } -static inline int reqsk_queue_is_full(const struct request_sock_queue *queue) -{ - return reqsk_queue_len(queue) >> queue->max_qlen_log; -} - #endif /* _REQUEST_SOCK_H */ diff --git a/net/core/request_sock.c b/net/core/request_sock.c index ecf74189bd3f..15c853806518 100644 --- a/net/core/request_sock.c +++ b/net/core/request_sock.c @@ -37,13 +37,8 @@ int sysctl_max_syn_backlog = 256; EXPORT_SYMBOL(sysctl_max_syn_backlog); -void reqsk_queue_alloc(struct request_sock_queue *queue, - unsigned int nr_table_entries) +void reqsk_queue_alloc(struct request_sock_queue *queue) { - nr_table_entries = min_t(u32, nr_table_entries, sysctl_max_syn_backlog); - nr_table_entries = max_t(u32, nr_table_entries, 8); - nr_table_entries = roundup_pow_of_two(nr_table_entries + 1); - spin_lock_init(&queue->rskq_lock); spin_lock_init(&queue->fastopenq.lock); @@ -53,7 +48,6 @@ void reqsk_queue_alloc(struct request_sock_queue *queue, queue->fastopenq.max_qlen = 0; queue->rskq_accept_head = NULL; - queue->max_qlen_log = ilog2(nr_table_entries); } /* diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c index 775483283fa7..5f6e31a4aeae 100644 --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -579,7 +579,7 @@ static void reqsk_timer_handler(unsigned long data) * ones are about to clog our table. */ qlen = reqsk_queue_len(queue); - if (qlen >> (queue->max_qlen_log - 1)) { + if ((qlen << 1) > sk_listener->sk_max_ack_backlog) { int young = reqsk_queue_len_young(queue) << 1; while (thresh > 2) { @@ -732,7 +732,7 @@ int inet_csk_listen_start(struct sock *sk, const int nr_table_entries) struct inet_connection_sock *icsk = inet_csk(sk); struct inet_sock *inet = inet_sk(sk); - reqsk_queue_alloc(&icsk->icsk_accept_queue, nr_table_entries); + reqsk_queue_alloc(&icsk->icsk_accept_queue); sk->sk_max_ack_backlog = 0; sk->sk_ack_backlog = 0;