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tcp_congctl.h revision 1.1 
      1 /*	$NetBSD: tcp_congctl.h,v 1.1 2006/10/09 16:27:07 rpaulo Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2006 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Rui Paulo.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #ifndef _NETINET_TCP_CONGCTL_H
     40 #define _NETINET_TCP_CONGCTL_H
     41 
     42 /*
     43  * Congestion control function table.
     44  */
     45 struct tcp_congctl {
     46 	int  (*fast_retransmit)(struct tcpcb *, struct tcphdr *);
     47 	void (*slow_retransmit)(struct tcpcb *);
     48 	void (*fast_retransmit_newack)(struct tcpcb *, struct tcphdr *);
     49 	void (*newack)(struct tcpcb *, struct tcphdr *);
     50 
     51 	uint32_t refcnt;
     52 };
     53 
     54 extern struct tcp_congctl tcp_reno_ctl;
     55 extern struct tcp_congctl tcp_newreno_ctl;
     56 
     57 extern struct simplelock tcp_congctl_slock;
     58 
     59 #define TCPCC_MAXLEN 12
     60 
     61 /* currently selected global congestion control */
     62 struct tcp_congctl *tcp_congctl_global;
     63 char   tcp_congctl_global_name[TCPCC_MAXLEN];
     64 
     65 /* available global congestion control algorithms */
     66 char   tcp_congctl_avail[10 * TCPCC_MAXLEN];
     67 
     68 void   tcp_congctl_init(void);
     69 int    tcp_congctl_register(const char *, struct tcp_congctl *);
     70 int    tcp_congctl_unregister(const char *);
     71 int    tcp_congctl_select(struct tcpcb *, const char *);
     72 const char *
     73        tcp_congctl_bystruct(const struct tcp_congctl *);
     74 
     75 inline void tcp_reno_congestion_exp(struct tcpcb *);
     76 
     77 #endif /* _NETINET_TCP_CONGCTL_H */
     78