0a70aaf8f5
CoDel is a parameterless queue discipline that handles variable bandwidth and RTT. It can be used as the single queue discipline on an interface or as a sub discipline of existing queue disciplines such as PRIQ, CBQ, HFSC, FAIRQ. Differential Revision: https://reviews.freebsd.org/D3272 Reviewd by: rpaulo, gnn (previous version) Obtained from: pfSense Sponsored by: Rubicon Communications (Netgate)
320 lines
11 KiB
C
320 lines
11 KiB
C
/*-
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* Copyright (c) 1997-1999 Carnegie Mellon University. All Rights Reserved.
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation is hereby granted (including for commercial or
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* for-profit use), provided that both the copyright notice and this
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* permission notice appear in all copies of the software, derivative
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* works, or modified versions, and any portions thereof.
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*
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* THIS SOFTWARE IS EXPERIMENTAL AND IS KNOWN TO HAVE BUGS, SOME OF
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* WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON PROVIDES THIS
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* SOFTWARE IN ITS ``AS IS'' CONDITION, AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* Carnegie Mellon encourages (but does not require) users of this
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* software to return any improvements or extensions that they make,
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* and to grant Carnegie Mellon the rights to redistribute these
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* changes without encumbrance.
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*
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* $KAME: altq_hfsc.h,v 1.12 2003/12/05 05:40:46 kjc Exp $
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* $FreeBSD$
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*/
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#ifndef _ALTQ_ALTQ_HFSC_H_
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#define _ALTQ_ALTQ_HFSC_H_
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#include <net/altq/altq.h>
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#include <net/altq/altq_classq.h>
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#include <net/altq/altq_codel.h>
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#include <net/altq/altq_red.h>
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#include <net/altq/altq_rio.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct service_curve {
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u_int m1; /* slope of the first segment in bits/sec */
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u_int d; /* the x-projection of the first segment in msec */
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u_int m2; /* slope of the second segment in bits/sec */
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};
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/* special class handles */
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#define HFSC_NULLCLASS_HANDLE 0
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#define HFSC_MAX_CLASSES 64
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/* hfsc class flags */
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#define HFCF_RED 0x0001 /* use RED */
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#define HFCF_ECN 0x0002 /* use RED/ECN */
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#define HFCF_RIO 0x0004 /* use RIO */
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#define HFCF_CODEL 0x0008 /* use CoDel */
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#define HFCF_CLEARDSCP 0x0010 /* clear diffserv codepoint */
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#define HFCF_DEFAULTCLASS 0x1000 /* default class */
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/* service curve types */
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#define HFSC_REALTIMESC 1
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#define HFSC_LINKSHARINGSC 2
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#define HFSC_UPPERLIMITSC 4
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#define HFSC_DEFAULTSC (HFSC_REALTIMESC|HFSC_LINKSHARINGSC)
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struct hfsc_classstats {
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u_int class_id;
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u_int32_t class_handle;
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struct service_curve rsc;
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struct service_curve fsc;
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struct service_curve usc; /* upper limit service curve */
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u_int64_t total; /* total work in bytes */
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u_int64_t cumul; /* cumulative work in bytes
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done by real-time criteria */
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u_int64_t d; /* deadline */
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u_int64_t e; /* eligible time */
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u_int64_t vt; /* virtual time */
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u_int64_t f; /* fit time for upper-limit */
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/* info helpful for debugging */
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u_int64_t initvt; /* init virtual time */
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u_int64_t vtoff; /* cl_vt_ipoff */
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u_int64_t cvtmax; /* cl_maxvt */
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u_int64_t myf; /* cl_myf */
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u_int64_t cfmin; /* cl_mincf */
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u_int64_t cvtmin; /* cl_mincvt */
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u_int64_t myfadj; /* cl_myfadj */
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u_int64_t vtadj; /* cl_vtadj */
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u_int64_t cur_time;
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u_int32_t machclk_freq;
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u_int qlength;
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u_int qlimit;
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struct pktcntr xmit_cnt;
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struct pktcntr drop_cnt;
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u_int period;
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u_int vtperiod; /* vt period sequence no */
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u_int parentperiod; /* parent's vt period seqno */
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int nactive; /* number of active children */
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/* codel, red and rio related info */
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int qtype;
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struct redstats red[3];
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struct codel_stats codel;
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};
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#ifdef ALTQ3_COMPAT
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struct hfsc_interface {
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char hfsc_ifname[IFNAMSIZ]; /* interface name (e.g., fxp0) */
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};
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struct hfsc_attach {
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struct hfsc_interface iface;
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u_int bandwidth; /* link bandwidth in bits/sec */
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};
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struct hfsc_add_class {
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struct hfsc_interface iface;
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u_int32_t parent_handle;
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struct service_curve service_curve;
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int qlimit;
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int flags;
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u_int32_t class_handle; /* return value */
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};
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struct hfsc_delete_class {
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struct hfsc_interface iface;
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u_int32_t class_handle;
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};
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struct hfsc_modify_class {
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struct hfsc_interface iface;
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u_int32_t class_handle;
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struct service_curve service_curve;
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int sctype;
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};
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struct hfsc_add_filter {
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struct hfsc_interface iface;
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u_int32_t class_handle;
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struct flow_filter filter;
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u_long filter_handle; /* return value */
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};
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struct hfsc_delete_filter {
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struct hfsc_interface iface;
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u_long filter_handle;
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};
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struct hfsc_class_stats {
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struct hfsc_interface iface;
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int nskip; /* skip # of classes */
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int nclasses; /* # of class stats (WR) */
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u_int64_t cur_time; /* current time */
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u_int32_t machclk_freq; /* machine clock frequency */
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u_int hif_classes; /* # of classes in the tree */
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u_int hif_packets; /* # of packets in the tree */
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struct hfsc_classstats *stats; /* pointer to stats array */
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};
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#define HFSC_IF_ATTACH _IOW('Q', 1, struct hfsc_attach)
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#define HFSC_IF_DETACH _IOW('Q', 2, struct hfsc_interface)
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#define HFSC_ENABLE _IOW('Q', 3, struct hfsc_interface)
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#define HFSC_DISABLE _IOW('Q', 4, struct hfsc_interface)
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#define HFSC_CLEAR_HIERARCHY _IOW('Q', 5, struct hfsc_interface)
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#define HFSC_ADD_CLASS _IOWR('Q', 7, struct hfsc_add_class)
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#define HFSC_DEL_CLASS _IOW('Q', 8, struct hfsc_delete_class)
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#define HFSC_MOD_CLASS _IOW('Q', 9, struct hfsc_modify_class)
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#define HFSC_ADD_FILTER _IOWR('Q', 10, struct hfsc_add_filter)
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#define HFSC_DEL_FILTER _IOW('Q', 11, struct hfsc_delete_filter)
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#define HFSC_GETSTATS _IOWR('Q', 12, struct hfsc_class_stats)
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#endif /* ALTQ3_COMPAT */
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#ifdef _KERNEL
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/*
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* kernel internal service curve representation
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* coordinates are given by 64 bit unsigned integers.
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* x-axis: unit is clock count. for the intel x86 architecture,
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* the raw Pentium TSC (Timestamp Counter) value is used.
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* virtual time is also calculated in this time scale.
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* y-axis: unit is byte.
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*
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* the service curve parameters are converted to the internal
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* representation.
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* the slope values are scaled to avoid overflow.
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* the inverse slope values as well as the y-projection of the 1st
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* segment are kept in order to to avoid 64-bit divide operations
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* that are expensive on 32-bit architectures.
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*
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* note: Intel Pentium TSC never wraps around in several thousands of years.
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* x-axis doesn't wrap around for 1089 years with 1GHz clock.
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* y-axis doesn't wrap around for 4358 years with 1Gbps bandwidth.
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*/
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/* kernel internal representation of a service curve */
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struct internal_sc {
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u_int64_t sm1; /* scaled slope of the 1st segment */
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u_int64_t ism1; /* scaled inverse-slope of the 1st segment */
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u_int64_t dx; /* the x-projection of the 1st segment */
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u_int64_t dy; /* the y-projection of the 1st segment */
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u_int64_t sm2; /* scaled slope of the 2nd segment */
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u_int64_t ism2; /* scaled inverse-slope of the 2nd segment */
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};
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/* runtime service curve */
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struct runtime_sc {
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u_int64_t x; /* current starting position on x-axis */
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u_int64_t y; /* current starting position on x-axis */
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u_int64_t sm1; /* scaled slope of the 1st segment */
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u_int64_t ism1; /* scaled inverse-slope of the 1st segment */
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u_int64_t dx; /* the x-projection of the 1st segment */
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u_int64_t dy; /* the y-projection of the 1st segment */
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u_int64_t sm2; /* scaled slope of the 2nd segment */
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u_int64_t ism2; /* scaled inverse-slope of the 2nd segment */
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};
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struct hfsc_class {
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u_int cl_id; /* class id (just for debug) */
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u_int32_t cl_handle; /* class handle */
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struct hfsc_if *cl_hif; /* back pointer to struct hfsc_if */
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int cl_flags; /* misc flags */
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struct hfsc_class *cl_parent; /* parent class */
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struct hfsc_class *cl_siblings; /* sibling classes */
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struct hfsc_class *cl_children; /* child classes */
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class_queue_t *cl_q; /* class queue structure */
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union {
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struct red *cl_red; /* RED state */
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struct codel *cl_codel; /* CoDel state */
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} cl_aqm;
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#define cl_red cl_aqm.cl_red
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#define cl_codel cl_aqm.cl_codel
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struct altq_pktattr *cl_pktattr; /* saved header used by ECN */
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u_int64_t cl_total; /* total work in bytes */
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u_int64_t cl_cumul; /* cumulative work in bytes
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done by real-time criteria */
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u_int64_t cl_d; /* deadline */
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u_int64_t cl_e; /* eligible time */
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u_int64_t cl_vt; /* virtual time */
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u_int64_t cl_f; /* time when this class will fit for
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link-sharing, max(myf, cfmin) */
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u_int64_t cl_myf; /* my fit-time (as calculated from this
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class's own upperlimit curve) */
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u_int64_t cl_myfadj; /* my fit-time adjustment
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(to cancel history dependence) */
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u_int64_t cl_cfmin; /* earliest children's fit-time (used
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with cl_myf to obtain cl_f) */
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u_int64_t cl_cvtmin; /* minimal virtual time among the
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children fit for link-sharing
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(monotonic within a period) */
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u_int64_t cl_vtadj; /* intra-period cumulative vt
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adjustment */
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u_int64_t cl_vtoff; /* inter-period cumulative vt offset */
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u_int64_t cl_cvtmax; /* max child's vt in the last period */
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u_int64_t cl_initvt; /* init virtual time (for debugging) */
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struct internal_sc *cl_rsc; /* internal real-time service curve */
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struct internal_sc *cl_fsc; /* internal fair service curve */
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struct internal_sc *cl_usc; /* internal upperlimit service curve */
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struct runtime_sc cl_deadline; /* deadline curve */
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struct runtime_sc cl_eligible; /* eligible curve */
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struct runtime_sc cl_virtual; /* virtual curve */
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struct runtime_sc cl_ulimit; /* upperlimit curve */
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u_int cl_vtperiod; /* vt period sequence no */
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u_int cl_parentperiod; /* parent's vt period seqno */
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int cl_nactive; /* number of active children */
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TAILQ_HEAD(acthead, hfsc_class) cl_actc; /* active children list */
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TAILQ_ENTRY(hfsc_class) cl_actlist; /* active children list entry */
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TAILQ_ENTRY(hfsc_class) cl_ellist; /* eligible list entry */
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struct {
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struct pktcntr xmit_cnt;
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struct pktcntr drop_cnt;
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u_int period;
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} cl_stats;
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};
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/*
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* hfsc interface state
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*/
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struct hfsc_if {
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struct hfsc_if *hif_next; /* interface state list */
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struct ifaltq *hif_ifq; /* backpointer to ifaltq */
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struct hfsc_class *hif_rootclass; /* root class */
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struct hfsc_class *hif_defaultclass; /* default class */
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struct hfsc_class *hif_class_tbl[HFSC_MAX_CLASSES];
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struct hfsc_class *hif_pollcache; /* cache for poll operation */
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u_int hif_classes; /* # of classes in the tree */
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u_int hif_packets; /* # of packets in the tree */
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u_int hif_classid; /* class id sequence number */
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TAILQ_HEAD(elighead, hfsc_class) hif_eligible; /* eligible list */
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#ifdef ALTQ3_CLFIER_COMPAT
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struct acc_classifier hif_classifier;
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#endif
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};
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#endif /* _KERNEL */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ALTQ_ALTQ_HFSC_H_ */
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