Annotation of sys/altq/altq_hfsc.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: altq_hfsc.h,v 1.6 2004/01/14 08:42:23 kjc Exp $ */
! 2: /* $KAME: altq_hfsc.h,v 1.8 2002/11/29 04:36:23 kjc Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1997-1999 Carnegie Mellon University. All Rights Reserved.
! 6: *
! 7: * Permission to use, copy, modify, and distribute this software and
! 8: * its documentation is hereby granted (including for commercial or
! 9: * for-profit use), provided that both the copyright notice and this
! 10: * permission notice appear in all copies of the software, derivative
! 11: * works, or modified versions, and any portions thereof.
! 12: *
! 13: * THIS SOFTWARE IS EXPERIMENTAL AND IS KNOWN TO HAVE BUGS, SOME OF
! 14: * WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON PROVIDES THIS
! 15: * SOFTWARE IN ITS ``AS IS'' CONDITION, AND ANY EXPRESS OR IMPLIED
! 16: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 17: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
! 18: * DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
! 19: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 20: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
! 21: * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
! 22: * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
! 23: * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
! 25: * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
! 26: * DAMAGE.
! 27: *
! 28: * Carnegie Mellon encourages (but does not require) users of this
! 29: * software to return any improvements or extensions that they make,
! 30: * and to grant Carnegie Mellon the rights to redistribute these
! 31: * changes without encumbrance.
! 32: */
! 33: #ifndef _ALTQ_ALTQ_HFSC_H_
! 34: #define _ALTQ_ALTQ_HFSC_H_
! 35:
! 36: #include <altq/altq.h>
! 37: #include <altq/altq_classq.h>
! 38: #include <altq/altq_red.h>
! 39: #include <altq/altq_rio.h>
! 40:
! 41: #ifdef __cplusplus
! 42: extern "C" {
! 43: #endif
! 44:
! 45: struct service_curve {
! 46: u_int m1; /* slope of the first segment in bits/sec */
! 47: u_int d; /* the x-projection of the first segment in msec */
! 48: u_int m2; /* slope of the second segment in bits/sec */
! 49: };
! 50:
! 51: /* special class handles */
! 52: #define HFSC_NULLCLASS_HANDLE 0
! 53: #define HFSC_MAX_CLASSES 64
! 54:
! 55: /* hfsc class flags */
! 56: #define HFCF_RED 0x0001 /* use RED */
! 57: #define HFCF_ECN 0x0002 /* use RED/ECN */
! 58: #define HFCF_RIO 0x0004 /* use RIO */
! 59: #define HFCF_CLEARDSCP 0x0010 /* clear diffserv codepoint */
! 60: #define HFCF_DEFAULTCLASS 0x1000 /* default class */
! 61:
! 62: /* service curve types */
! 63: #define HFSC_REALTIMESC 1
! 64: #define HFSC_LINKSHARINGSC 2
! 65: #define HFSC_UPPERLIMITSC 4
! 66: #define HFSC_DEFAULTSC (HFSC_REALTIMESC|HFSC_LINKSHARINGSC)
! 67:
! 68: struct hfsc_classstats {
! 69: u_int class_id;
! 70: u_int32_t class_handle;
! 71: struct service_curve rsc;
! 72: struct service_curve fsc;
! 73: struct service_curve usc; /* upper limit service curve */
! 74:
! 75: u_int64_t total; /* total work in bytes */
! 76: u_int64_t cumul; /* cumulative work in bytes
! 77: done by real-time criteria */
! 78: u_int64_t d; /* deadline */
! 79: u_int64_t e; /* eligible time */
! 80: u_int64_t vt; /* virtual time */
! 81: u_int64_t f; /* fit time for upper-limit */
! 82:
! 83: /* info helpful for debugging */
! 84: u_int64_t initvt; /* init virtual time */
! 85: u_int64_t vtoff; /* cl_vt_ipoff */
! 86: u_int64_t cvtmax; /* cl_maxvt */
! 87: u_int64_t myf; /* cl_myf */
! 88: u_int64_t cfmin; /* cl_mincf */
! 89: u_int64_t cvtmin; /* cl_mincvt */
! 90: u_int64_t myfadj; /* cl_myfadj */
! 91: u_int64_t vtadj; /* cl_vtadj */
! 92: u_int64_t cur_time;
! 93: u_int32_t machclk_freq;
! 94:
! 95: u_int qlength;
! 96: u_int qlimit;
! 97: struct pktcntr xmit_cnt;
! 98: struct pktcntr drop_cnt;
! 99: u_int period;
! 100:
! 101: u_int vtperiod; /* vt period sequence no */
! 102: u_int parentperiod; /* parent's vt period seqno */
! 103: int nactive; /* number of active children */
! 104:
! 105: /* red and rio related info */
! 106: int qtype;
! 107: struct redstats red[3];
! 108: };
! 109:
! 110: #ifdef _KERNEL
! 111: /*
! 112: * kernel internal service curve representation
! 113: * coordinates are given by 64 bit unsigned integers.
! 114: * x-axis: unit is clock count. for the intel x86 architecture,
! 115: * the raw Pentium TSC (Timestamp Counter) value is used.
! 116: * virtual time is also calculated in this time scale.
! 117: * y-axis: unit is byte.
! 118: *
! 119: * the service curve parameters are converted to the internal
! 120: * representation.
! 121: * the slope values are scaled to avoid overflow.
! 122: * the inverse slope values as well as the y-projection of the 1st
! 123: * segment are kept in order to to avoid 64-bit divide operations
! 124: * that are expensive on 32-bit architectures.
! 125: *
! 126: * note: Intel Pentium TSC never wraps around in several thousands of years.
! 127: * x-axis doesn't wrap around for 1089 years with 1GHz clock.
! 128: * y-axis doesn't wrap around for 4358 years with 1Gbps bandwidth.
! 129: */
! 130:
! 131: /* kernel internal representation of a service curve */
! 132: struct internal_sc {
! 133: u_int64_t sm1; /* scaled slope of the 1st segment */
! 134: u_int64_t ism1; /* scaled inverse-slope of the 1st segment */
! 135: u_int64_t dx; /* the x-projection of the 1st segment */
! 136: u_int64_t dy; /* the y-projection of the 1st segment */
! 137: u_int64_t sm2; /* scaled slope of the 2nd segment */
! 138: u_int64_t ism2; /* scaled inverse-slope of the 2nd segment */
! 139: };
! 140:
! 141: /* runtime service curve */
! 142: struct runtime_sc {
! 143: u_int64_t x; /* current starting position on x-axis */
! 144: u_int64_t y; /* current starting position on x-axis */
! 145: u_int64_t sm1; /* scaled slope of the 1st segment */
! 146: u_int64_t ism1; /* scaled inverse-slope of the 1st segment */
! 147: u_int64_t dx; /* the x-projection of the 1st segment */
! 148: u_int64_t dy; /* the y-projection of the 1st segment */
! 149: u_int64_t sm2; /* scaled slope of the 2nd segment */
! 150: u_int64_t ism2; /* scaled inverse-slope of the 2nd segment */
! 151: };
! 152:
! 153: /* for TAILQ based ellist and actlist implementation */
! 154: struct hfsc_class;
! 155: typedef TAILQ_HEAD(_eligible, hfsc_class) ellist_t;
! 156: typedef TAILQ_ENTRY(hfsc_class) elentry_t;
! 157: typedef TAILQ_HEAD(_active, hfsc_class) actlist_t;
! 158: typedef TAILQ_ENTRY(hfsc_class) actentry_t;
! 159: #define ellist_first(s) TAILQ_FIRST(s)
! 160: #define actlist_first(s) TAILQ_FIRST(s)
! 161: #define actlist_last(s) TAILQ_LAST(s, _active)
! 162:
! 163: struct hfsc_class {
! 164: u_int cl_id; /* class id (just for debug) */
! 165: u_int32_t cl_handle; /* class handle */
! 166: struct hfsc_if *cl_hif; /* back pointer to struct hfsc_if */
! 167: int cl_flags; /* misc flags */
! 168:
! 169: struct hfsc_class *cl_parent; /* parent class */
! 170: struct hfsc_class *cl_siblings; /* sibling classes */
! 171: struct hfsc_class *cl_children; /* child classes */
! 172:
! 173: class_queue_t *cl_q; /* class queue structure */
! 174: struct red *cl_red; /* RED state */
! 175: struct altq_pktattr *cl_pktattr; /* saved header used by ECN */
! 176:
! 177: u_int64_t cl_total; /* total work in bytes */
! 178: u_int64_t cl_cumul; /* cumulative work in bytes
! 179: done by real-time criteria */
! 180: u_int64_t cl_d; /* deadline */
! 181: u_int64_t cl_e; /* eligible time */
! 182: u_int64_t cl_vt; /* virtual time */
! 183: u_int64_t cl_f; /* time when this class will fit for
! 184: link-sharing, max(myf, cfmin) */
! 185: u_int64_t cl_myf; /* my fit-time (as calculated from this
! 186: class's own upperlimit curve) */
! 187: u_int64_t cl_myfadj; /* my fit-time adjustment
! 188: (to cancel history dependence) */
! 189: u_int64_t cl_cfmin; /* earliest children's fit-time (used
! 190: with cl_myf to obtain cl_f) */
! 191: u_int64_t cl_cvtmin; /* minimal virtual time among the
! 192: children fit for link-sharing
! 193: (monotonic within a period) */
! 194: u_int64_t cl_vtadj; /* intra-period cumulative vt
! 195: adjustment */
! 196: u_int64_t cl_vtoff; /* inter-period cumulative vt offset */
! 197: u_int64_t cl_cvtmax; /* max child's vt in the last period */
! 198:
! 199: u_int64_t cl_initvt; /* init virtual time (for debugging) */
! 200:
! 201: struct internal_sc *cl_rsc; /* internal real-time service curve */
! 202: struct internal_sc *cl_fsc; /* internal fair service curve */
! 203: struct internal_sc *cl_usc; /* internal upperlimit service curve */
! 204: struct runtime_sc cl_deadline; /* deadline curve */
! 205: struct runtime_sc cl_eligible; /* eligible curve */
! 206: struct runtime_sc cl_virtual; /* virtual curve */
! 207: struct runtime_sc cl_ulimit; /* upperlimit curve */
! 208:
! 209: u_int cl_vtperiod; /* vt period sequence no */
! 210: u_int cl_parentperiod; /* parent's vt period seqno */
! 211: int cl_nactive; /* number of active children */
! 212: actlist_t *cl_actc; /* active children list */
! 213:
! 214: actentry_t cl_actlist; /* active children list entry */
! 215: elentry_t cl_ellist; /* eligible list entry */
! 216:
! 217: struct {
! 218: struct pktcntr xmit_cnt;
! 219: struct pktcntr drop_cnt;
! 220: u_int period;
! 221: } cl_stats;
! 222: };
! 223:
! 224: /*
! 225: * hfsc interface state
! 226: */
! 227: struct hfsc_if {
! 228: struct hfsc_if *hif_next; /* interface state list */
! 229: struct ifaltq *hif_ifq; /* backpointer to ifaltq */
! 230: struct hfsc_class *hif_rootclass; /* root class */
! 231: struct hfsc_class *hif_defaultclass; /* default class */
! 232: struct hfsc_class *hif_class_tbl[HFSC_MAX_CLASSES];
! 233: struct hfsc_class *hif_pollcache; /* cache for poll operation */
! 234:
! 235: u_int hif_classes; /* # of classes in the tree */
! 236: u_int hif_packets; /* # of packets in the tree */
! 237: u_int hif_classid; /* class id sequence number */
! 238:
! 239: ellist_t *hif_eligible; /* eligible list */
! 240: };
! 241:
! 242: #endif /* _KERNEL */
! 243:
! 244: #ifdef __cplusplus
! 245: }
! 246: #endif
! 247:
! 248: #endif /* _ALTQ_ALTQ_HFSC_H_ */
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