From 1a2c6181c4a1922021b4d7df373bba612c3e5f04 Mon Sep 17 00:00:00 2001 From: Christoph Paasch Date: Sun, 17 Mar 2013 08:23:34 +0000 Subject: tcp: Remove TCPCT TCPCT uses option-number 253, reserved for experimental use and should not be used in production environments. Further, TCPCT does not fully implement RFC 6013. As a nice side-effect, removing TCPCT increases TCP's performance for very short flows: Doing an apache-benchmark with -c 100 -n 100000, sending HTTP-requests for files of 1KB size. before this patch: average (among 7 runs) of 20845.5 Requests/Second after: average (among 7 runs) of 21403.6 Requests/Second Signed-off-by: Christoph Paasch Signed-off-by: David S. Miller --- net/ipv4/tcp_minisocks.c | 40 +++++----------------------------------- 1 file changed, 5 insertions(+), 35 deletions(-) (limited to 'net/ipv4/tcp_minisocks.c') diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c index 4bdb09fca401..8f0234f8bb95 100644 --- a/net/ipv4/tcp_minisocks.c +++ b/net/ipv4/tcp_minisocks.c @@ -93,13 +93,12 @@ tcp_timewait_state_process(struct inet_timewait_sock *tw, struct sk_buff *skb, const struct tcphdr *th) { struct tcp_options_received tmp_opt; - const u8 *hash_location; struct tcp_timewait_sock *tcptw = tcp_twsk((struct sock *)tw); bool paws_reject = false; tmp_opt.saw_tstamp = 0; if (th->doff > (sizeof(*th) >> 2) && tcptw->tw_ts_recent_stamp) { - tcp_parse_options(skb, &tmp_opt, &hash_location, 0, NULL); + tcp_parse_options(skb, &tmp_opt, 0, NULL); if (tmp_opt.saw_tstamp) { tmp_opt.rcv_tsecr -= tcptw->tw_ts_offset; @@ -388,32 +387,6 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req, struct tcp_request_sock *treq = tcp_rsk(req); struct inet_connection_sock *newicsk = inet_csk(newsk); struct tcp_sock *newtp = tcp_sk(newsk); - struct tcp_sock *oldtp = tcp_sk(sk); - struct tcp_cookie_values *oldcvp = oldtp->cookie_values; - - /* TCP Cookie Transactions require space for the cookie pair, - * as it differs for each connection. There is no need to - * copy any s_data_payload stored at the original socket. - * Failure will prevent resuming the connection. - * - * Presumed copied, in order of appearance: - * cookie_in_always, cookie_out_never - */ - if (oldcvp != NULL) { - struct tcp_cookie_values *newcvp = - kzalloc(sizeof(*newtp->cookie_values), - GFP_ATOMIC); - - if (newcvp != NULL) { - kref_init(&newcvp->kref); - newcvp->cookie_desired = - oldcvp->cookie_desired; - newtp->cookie_values = newcvp; - } else { - /* Not Yet Implemented */ - newtp->cookie_values = NULL; - } - } /* Now setup tcp_sock */ newtp->pred_flags = 0; @@ -422,8 +395,7 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req, newtp->rcv_nxt = treq->rcv_isn + 1; newtp->snd_sml = newtp->snd_una = - newtp->snd_nxt = newtp->snd_up = - treq->snt_isn + 1 + tcp_s_data_size(oldtp); + newtp->snd_nxt = newtp->snd_up = treq->snt_isn + 1; tcp_prequeue_init(newtp); INIT_LIST_HEAD(&newtp->tsq_node); @@ -460,8 +432,7 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req, tcp_set_ca_state(newsk, TCP_CA_Open); tcp_init_xmit_timers(newsk); skb_queue_head_init(&newtp->out_of_order_queue); - newtp->write_seq = newtp->pushed_seq = - treq->snt_isn + 1 + tcp_s_data_size(oldtp); + newtp->write_seq = newtp->pushed_seq = treq->snt_isn + 1; newtp->rx_opt.saw_tstamp = 0; @@ -538,7 +509,6 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb, bool fastopen) { struct tcp_options_received tmp_opt; - const u8 *hash_location; struct sock *child; const struct tcphdr *th = tcp_hdr(skb); __be32 flg = tcp_flag_word(th) & (TCP_FLAG_RST|TCP_FLAG_SYN|TCP_FLAG_ACK); @@ -548,7 +518,7 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb, tmp_opt.saw_tstamp = 0; if (th->doff > (sizeof(struct tcphdr)>>2)) { - tcp_parse_options(skb, &tmp_opt, &hash_location, 0, NULL); + tcp_parse_options(skb, &tmp_opt, 0, NULL); if (tmp_opt.saw_tstamp) { tmp_opt.ts_recent = req->ts_recent; @@ -648,7 +618,7 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb, */ if ((flg & TCP_FLAG_ACK) && !fastopen && (TCP_SKB_CB(skb)->ack_seq != - tcp_rsk(req)->snt_isn + 1 + tcp_s_data_size(tcp_sk(sk)))) + tcp_rsk(req)->snt_isn + 1)) return sk; /* Also, it would be not so bad idea to check rcv_tsecr, which -- cgit v1.2.3-59-g8ed1b