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+/* $KAME: altq_red.h,v 1.8 2003/07/10 12:07:49 kjc Exp $ */
+
+/*
+ * 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.
+ */
+
+#ifndef _ALTQ_ALTQ_RED_H_
+#define _ALTQ_ALTQ_RED_H_
+
+#include <altq/altq_classq.h>
+
+#ifdef ALTQ3_COMPAT
+struct red_interface {
+ char red_ifname[IFNAMSIZ];
+};
+
+struct red_stats {
+ struct red_interface iface;
+ int q_len;
+ int q_avg;
+
+ struct pktcntr xmit_cnt;
+ struct pktcntr drop_cnt;
+ u_int drop_forced;
+ u_int drop_unforced;
+ u_int marked_packets;
+
+ /* static red parameters */
+ int q_limit;
+ int weight;
+ int inv_pmax;
+ int th_min;
+ int th_max;
+
+ /* flowvalve related stuff */
+ u_int fv_flows;
+ u_int fv_pass;
+ u_int fv_predrop;
+ u_int fv_alloc;
+ u_int fv_escape;
+};
+
+struct red_conf {
+ struct red_interface iface;
+ 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 */
+ int red_limit; /* max queue length */
+ int red_pkttime; /* average packet time in usec */
+ int red_flags; /* see below */
+};
+#endif /* ALTQ3_COMPAT */
+
+/* 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 ALTQ3_COMPAT
+/*
+ * IOCTLs for RED
+ */
+#define RED_IF_ATTACH _IOW('Q', 1, struct red_interface)
+#define RED_IF_DETACH _IOW('Q', 2, struct red_interface)
+#define RED_ENABLE _IOW('Q', 3, struct red_interface)
+#define RED_DISABLE _IOW('Q', 4, struct red_interface)
+#define RED_CONFIG _IOWR('Q', 6, struct red_conf)
+#define RED_GETSTATS _IOWR('Q', 12, struct red_stats)
+#define RED_SETDEFAULTS _IOW('Q', 30, struct redparams)
+#endif /* ALTQ3_COMPAT */
+
+#ifdef _KERNEL
+
+#ifdef ALTQ3_COMPAT
+struct flowvalve;
+#endif
+
+/* 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 */
+
+#ifdef ALTQ3_COMPAT
+ struct flowvalve *red_flowvalve; /* flowvalve state */
+#endif
+
+ 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;
+
+#ifdef ALTQ3_COMPAT
+typedef struct red_queue {
+ struct red_queue *rq_next; /* next red_state in the list */
+ struct ifaltq *rq_ifq; /* backpointer to ifaltq */
+
+ class_queue_t *rq_q;
+
+ red_t *rq_red;
+} red_queue_t;
+#endif /* ALTQ3_COMPAT */
+
+/* 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_ */