diff options
Diffstat (limited to 'net/ipv4/tcp.c')
| -rw-r--r-- | net/ipv4/tcp.c | 39 |
1 files changed, 32 insertions, 7 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 27ce13ece510..47c217905864 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket @@ -205,11 +206,6 @@ * Hirokazu Takahashi : Use copy_from_user() instead of * csum_and_copy_from_user() if possible. * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or(at your option) any later version. - * * Description of States: * * TCP_SYN_SENT sent a connection request, waiting for ack @@ -321,6 +317,11 @@ struct tcp_splice_state { unsigned long tcp_memory_pressure __read_mostly; EXPORT_SYMBOL_GPL(tcp_memory_pressure); +DEFINE_STATIC_KEY_FALSE(tcp_rx_skb_cache_key); +EXPORT_SYMBOL(tcp_rx_skb_cache_key); + +DEFINE_STATIC_KEY_FALSE(tcp_tx_skb_cache_key); + void tcp_enter_memory_pressure(struct sock *sk) { unsigned long val; @@ -2740,6 +2741,21 @@ static int tcp_repair_options_est(struct sock *sk, return 0; } +DEFINE_STATIC_KEY_FALSE(tcp_tx_delay_enabled); +EXPORT_SYMBOL(tcp_tx_delay_enabled); + +static void tcp_enable_tx_delay(void) +{ + if (!static_branch_unlikely(&tcp_tx_delay_enabled)) { + static int __tcp_tx_delay_enabled = 0; + + if (cmpxchg(&__tcp_tx_delay_enabled, 0, 1) == 0) { + static_branch_enable(&tcp_tx_delay_enabled); + pr_info("TCP_TX_DELAY enabled\n"); + } + } +} + /* * Socket option code for TCP. */ @@ -2806,8 +2822,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level, if (optlen == TCP_FASTOPEN_KEY_BUF_LENGTH) backup_key = key + TCP_FASTOPEN_KEY_LENGTH; - return tcp_fastopen_reset_cipher(net, sk, key, backup_key, - TCP_FASTOPEN_KEY_LENGTH); + return tcp_fastopen_reset_cipher(net, sk, key, backup_key); } default: /* fallthru */ @@ -3091,6 +3106,11 @@ static int do_tcp_setsockopt(struct sock *sk, int level, else tp->recvmsg_inq = val; break; + case TCP_TX_DELAY: + if (val) + tcp_enable_tx_delay(); + tp->tcp_tx_delay = val; + break; default: err = -ENOPROTOOPT; break; @@ -3550,6 +3570,10 @@ static int do_tcp_getsockopt(struct sock *sk, int level, val = tp->fastopen_no_cookie; break; + case TCP_TX_DELAY: + val = tp->tcp_tx_delay; + break; + case TCP_TIMESTAMP: val = tcp_time_stamp_raw() + tp->tsoffset; break; @@ -3883,6 +3907,7 @@ void __init tcp_init(void) unsigned long limit; unsigned int i; + BUILD_BUG_ON(TCP_MIN_SND_MSS <= MAX_TCP_OPTION_SPACE); BUILD_BUG_ON(sizeof(struct tcp_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); |