The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_congctl.h

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    1 /*      $NetBSD: tcp_congctl.h,v 1.3 2006/10/21 10:24:47 yamt 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 *, const struct tcphdr *);
   47         void (*slow_retransmit)(struct tcpcb *);
   48         void (*fast_retransmit_newack)(struct tcpcb *, const struct tcphdr *);
   49         void (*newack)(struct tcpcb *, const struct tcphdr *);
   50         void (*cong_exp)(struct tcpcb *);
   51         
   52         uint32_t refcnt;
   53 };
   54 
   55 extern struct tcp_congctl tcp_reno_ctl;
   56 extern struct tcp_congctl tcp_newreno_ctl;
   57 
   58 extern struct simplelock tcp_congctl_slock;
   59 
   60 #define TCPCC_MAXLEN 12
   61 
   62 /* currently selected global congestion control */
   63 struct tcp_congctl *tcp_congctl_global;
   64 char   tcp_congctl_global_name[TCPCC_MAXLEN];
   65 
   66 /* available global congestion control algorithms */
   67 char   tcp_congctl_avail[10 * TCPCC_MAXLEN];
   68 
   69 void   tcp_congctl_init(void);
   70 int    tcp_congctl_register(const char *, struct tcp_congctl *);
   71 int    tcp_congctl_unregister(const char *);
   72 int    tcp_congctl_select(struct tcpcb *, const char *);
   73 const char *
   74        tcp_congctl_bystruct(const struct tcp_congctl *);
   75 
   76 #endif /* _NETINET_TCP_CONGCTL_H */

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