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Diffstat (limited to 'sys/net/altq/altq_red.h')
| -rw-r--r-- | sys/net/altq/altq_red.h | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/sys/net/altq/altq_red.h b/sys/net/altq/altq_red.h new file mode 100644 index 000000000000..13edb4870a62 --- /dev/null +++ b/sys/net/altq/altq_red.h @@ -0,0 +1,123 @@ +/*- + * Copyright (C) 1997-2003 + * Sony Computer Science Laboratories Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $KAME: altq_red.h,v 1.8 2003/07/10 12:07:49 kjc Exp $ + */ + +#ifndef _ALTQ_ALTQ_RED_H_ +#define _ALTQ_ALTQ_RED_H_ + +#include <net/altq/altq_classq.h> + +/* red flags */ +#define REDF_ECN4 0x01 /* use packet marking for IPv4 packets */ +#define REDF_ECN6 0x02 /* use packet marking for IPv6 packets */ +#define REDF_ECN (REDF_ECN4 | REDF_ECN6) +#define REDF_FLOWVALVE 0x04 /* use flowvalve (aka penalty-box) */ + +/* + * simpler versions of red parameters and statistics used by other + * disciplines (e.g., CBQ) + */ +struct redparams { + int th_min; /* red min threshold */ + int th_max; /* red max threshold */ + int inv_pmax; /* inverse of max drop probability */ +}; + +struct redstats { + int q_avg; + struct pktcntr xmit_cnt; + struct pktcntr drop_cnt; + u_int drop_forced; + u_int drop_unforced; + u_int marked_packets; +}; + +#ifdef _KERNEL + +/* weight table structure for idle time calibration */ +struct wtab { + struct wtab *w_next; + int w_weight; + int w_param_max; + int w_refcount; + int32_t w_tab[32]; +}; + +typedef struct red { + int red_pkttime; /* average packet time in micro sec + used for idle calibration */ + int red_flags; /* red flags */ + + /* red parameters */ + int red_weight; /* weight for EWMA */ + int red_inv_pmax; /* inverse of max drop probability */ + int red_thmin; /* red min threshold */ + int red_thmax; /* red max threshold */ + + /* variables for internal use */ + int red_wshift; /* log(red_weight) */ + int red_thmin_s; /* th_min scaled by avgshift */ + int red_thmax_s; /* th_max scaled by avgshift */ + int red_probd; /* drop probability denominator */ + + int red_avg; /* queue len avg scaled by avgshift */ + int red_count; /* packet count since last dropped/ + marked packet */ + int red_idle; /* queue was empty */ + int red_old; /* avg is above th_min */ + struct wtab *red_wtab; /* weight table */ + struct timeval red_last; /* time when the queue becomes idle */ + + struct { + struct pktcntr xmit_cnt; + struct pktcntr drop_cnt; + u_int drop_forced; + u_int drop_unforced; + u_int marked_packets; + } red_stats; +} red_t; + +/* red drop types */ +#define DTYPE_NODROP 0 /* no drop */ +#define DTYPE_FORCED 1 /* a "forced" drop */ +#define DTYPE_EARLY 2 /* an "unforced" (early) drop */ + +extern red_t *red_alloc(int, int, int, int, int, int); +extern void red_destroy(red_t *); +extern void red_getstats(red_t *, struct redstats *); +extern int red_addq(red_t *, class_queue_t *, struct mbuf *, + struct altq_pktattr *); +extern struct mbuf *red_getq(red_t *, class_queue_t *); +extern int drop_early(int, int, int); +extern int mark_ecn(struct mbuf *, struct altq_pktattr *, int); +extern struct wtab *wtab_alloc(int); +extern int wtab_destroy(struct wtab *); +extern int32_t pow_w(struct wtab *, int); + +#endif /* _KERNEL */ + +#endif /* _ALTQ_ALTQ_RED_H_ */ |