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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /net/sched/sch_hfsc.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/sched/sch_hfsc.c')
-rw-r--r--net/sched/sch_hfsc.c1697
1 files changed, 1697 insertions, 0 deletions
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
new file mode 100644
index 0000000000..880c5f16b2
--- /dev/null
+++ b/net/sched/sch_hfsc.c
@@ -0,0 +1,1697 @@
+/*
+ * Copyright (c) 2003 Patrick McHardy, <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * 2003-10-17 - Ported from altq
+ */
+/*
+ * Copyright (c) 1997-1999 Carnegie Mellon University. All Rights Reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software and
+ * its documentation is hereby granted (including for commercial or
+ * for-profit use), provided that both the copyright notice and this
+ * permission notice appear in all copies of the software, derivative
+ * works, or modified versions, and any portions thereof.
+ *
+ * THIS SOFTWARE IS EXPERIMENTAL AND IS KNOWN TO HAVE BUGS, SOME OF
+ * WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON PROVIDES THIS
+ * SOFTWARE IN ITS ``AS IS'' CONDITION, 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 CARNEGIE MELLON UNIVERSITY 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.
+ *
+ * Carnegie Mellon encourages (but does not require) users of this
+ * software to return any improvements or extensions that they make,
+ * and to grant Carnegie Mellon the rights to redistribute these
+ * changes without encumbrance.
+ */
+/*
+ * H-FSC is described in Proceedings of SIGCOMM'97,
+ * "A Hierarchical Fair Service Curve Algorithm for Link-Sharing,
+ * Real-Time and Priority Service"
+ * by Ion Stoica, Hui Zhang, and T. S. Eugene Ng.
+ *
+ * Oleg Cherevko <olwi@aq.ml.com.ua> added the upperlimit for link-sharing.
+ * when a class has an upperlimit, the fit-time is computed from the
+ * upperlimit service curve. the link-sharing scheduler does not schedule
+ * a class whose fit-time exceeds the current time.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/compiler.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/rbtree.h>
+#include <linux/init.h>
+#include <linux/rtnetlink.h>
+#include <linux/pkt_sched.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <net/pkt_cls.h>
+#include <asm/div64.h>
+
+/*
+ * kernel internal service curve representation:
+ * coordinates are given by 64 bit unsigned integers.
+ * x-axis: unit is clock count.
+ * y-axis: unit is byte.
+ *
+ * The service curve parameters are converted to the internal
+ * representation. The slope values are scaled to avoid overflow.
+ * the inverse slope values as well as the y-projection of the 1st
+ * segment are kept in order to avoid 64-bit divide operations
+ * that are expensive on 32-bit architectures.
+ */
+
+struct internal_sc {
+ u64 sm1; /* scaled slope of the 1st segment */
+ u64 ism1; /* scaled inverse-slope of the 1st segment */
+ u64 dx; /* the x-projection of the 1st segment */
+ u64 dy; /* the y-projection of the 1st segment */
+ u64 sm2; /* scaled slope of the 2nd segment */
+ u64 ism2; /* scaled inverse-slope of the 2nd segment */
+};
+
+/* runtime service curve */
+struct runtime_sc {
+ u64 x; /* current starting position on x-axis */
+ u64 y; /* current starting position on y-axis */
+ u64 sm1; /* scaled slope of the 1st segment */
+ u64 ism1; /* scaled inverse-slope of the 1st segment */
+ u64 dx; /* the x-projection of the 1st segment */
+ u64 dy; /* the y-projection of the 1st segment */
+ u64 sm2; /* scaled slope of the 2nd segment */
+ u64 ism2; /* scaled inverse-slope of the 2nd segment */
+};
+
+enum hfsc_class_flags {
+ HFSC_RSC = 0x1,
+ HFSC_FSC = 0x2,
+ HFSC_USC = 0x4
+};
+
+struct hfsc_class {
+ struct Qdisc_class_common cl_common;
+
+ struct gnet_stats_basic_sync bstats;
+ struct gnet_stats_queue qstats;
+ struct net_rate_estimator __rcu *rate_est;
+ struct tcf_proto __rcu *filter_list; /* filter list */
+ struct tcf_block *block;
+ unsigned int level; /* class level in hierarchy */
+
+ struct hfsc_sched *sched; /* scheduler data */
+ struct hfsc_class *cl_parent; /* parent class */
+ struct list_head siblings; /* sibling classes */
+ struct list_head children; /* child classes */
+ struct Qdisc *qdisc; /* leaf qdisc */
+
+ struct rb_node el_node; /* qdisc's eligible tree member */
+ struct rb_root vt_tree; /* active children sorted by cl_vt */
+ struct rb_node vt_node; /* parent's vt_tree member */
+ struct rb_root cf_tree; /* active children sorted by cl_f */
+ struct rb_node cf_node; /* parent's cf_heap member */
+
+ u64 cl_total; /* total work in bytes */
+ u64 cl_cumul; /* cumulative work in bytes done by
+ real-time criteria */
+
+ u64 cl_d; /* deadline*/
+ u64 cl_e; /* eligible time */
+ u64 cl_vt; /* virtual time */
+ u64 cl_f; /* time when this class will fit for
+ link-sharing, max(myf, cfmin) */
+ u64 cl_myf; /* my fit-time (calculated from this
+ class's own upperlimit curve) */
+ u64 cl_cfmin; /* earliest children's fit-time (used
+ with cl_myf to obtain cl_f) */
+ u64 cl_cvtmin; /* minimal virtual time among the
+ children fit for link-sharing
+ (monotonic within a period) */
+ u64 cl_vtadj; /* intra-period cumulative vt
+ adjustment */
+ u64 cl_cvtoff; /* largest virtual time seen among
+ the children */
+
+ struct internal_sc cl_rsc; /* internal real-time service curve */
+ struct internal_sc cl_fsc; /* internal fair service curve */
+ struct internal_sc cl_usc; /* internal upperlimit service curve */
+ struct runtime_sc cl_deadline; /* deadline curve */
+ struct runtime_sc cl_eligible; /* eligible curve */
+ struct runtime_sc cl_virtual; /* virtual curve */
+ struct runtime_sc cl_ulimit; /* upperlimit curve */
+
+ u8 cl_flags; /* which curves are valid */
+ u32 cl_vtperiod; /* vt period sequence number */
+ u32 cl_parentperiod;/* parent's vt period sequence number*/
+ u32 cl_nactive; /* number of active children */
+};
+
+struct hfsc_sched {
+ u16 defcls; /* default class id */
+ struct hfsc_class root; /* root class */
+ struct Qdisc_class_hash clhash; /* class hash */
+ struct rb_root eligible; /* eligible tree */
+ struct qdisc_watchdog watchdog; /* watchdog timer */
+};
+
+#define HT_INFINITY 0xffffffffffffffffULL /* infinite time value */
+
+
+/*
+ * eligible tree holds backlogged classes being sorted by their eligible times.
+ * there is one eligible tree per hfsc instance.
+ */
+
+static void
+eltree_insert(struct hfsc_class *cl)
+{
+ struct rb_node **p = &cl->sched->eligible.rb_node;
+ struct rb_node *parent = NULL;
+ struct hfsc_class *cl1;
+
+ while (*p != NULL) {
+ parent = *p;
+ cl1 = rb_entry(parent, struct hfsc_class, el_node);
+ if (cl->cl_e >= cl1->cl_e)
+ p = &parent->rb_right;
+ else
+ p = &parent->rb_left;
+ }
+ rb_link_node(&cl->el_node, parent, p);
+ rb_insert_color(&cl->el_node, &cl->sched->eligible);
+}
+
+static inline void
+eltree_remove(struct hfsc_class *cl)
+{
+ rb_erase(&cl->el_node, &cl->sched->eligible);
+}
+
+static inline void
+eltree_update(struct hfsc_class *cl)
+{
+ eltree_remove(cl);
+ eltree_insert(cl);
+}
+
+/* find the class with the minimum deadline among the eligible classes */
+static inline struct hfsc_class *
+eltree_get_mindl(struct hfsc_sched *q, u64 cur_time)
+{
+ struct hfsc_class *p, *cl = NULL;
+ struct rb_node *n;
+
+ for (n = rb_first(&q->eligible); n != NULL; n = rb_next(n)) {
+ p = rb_entry(n, struct hfsc_class, el_node);
+ if (p->cl_e > cur_time)
+ break;
+ if (cl == NULL || p->cl_d < cl->cl_d)
+ cl = p;
+ }
+ return cl;
+}
+
+/* find the class with minimum eligible time among the eligible classes */
+static inline struct hfsc_class *
+eltree_get_minel(struct hfsc_sched *q)
+{
+ struct rb_node *n;
+
+ n = rb_first(&q->eligible);
+ if (n == NULL)
+ return NULL;
+ return rb_entry(n, struct hfsc_class, el_node);
+}
+
+/*
+ * vttree holds holds backlogged child classes being sorted by their virtual
+ * time. each intermediate class has one vttree.
+ */
+static void
+vttree_insert(struct hfsc_class *cl)
+{
+ struct rb_node **p = &cl->cl_parent->vt_tree.rb_node;
+ struct rb_node *parent = NULL;
+ struct hfsc_class *cl1;
+
+ while (*p != NULL) {
+ parent = *p;
+ cl1 = rb_entry(parent, struct hfsc_class, vt_node);
+ if (cl->cl_vt >= cl1->cl_vt)
+ p = &parent->rb_right;
+ else
+ p = &parent->rb_left;
+ }
+ rb_link_node(&cl->vt_node, parent, p);
+ rb_insert_color(&cl->vt_node, &cl->cl_parent->vt_tree);
+}
+
+static inline void
+vttree_remove(struct hfsc_class *cl)
+{
+ rb_erase(&cl->vt_node, &cl->cl_parent->vt_tree);
+}
+
+static inline void
+vttree_update(struct hfsc_class *cl)
+{
+ vttree_remove(cl);
+ vttree_insert(cl);
+}
+
+static inline struct hfsc_class *
+vttree_firstfit(struct hfsc_class *cl, u64 cur_time)
+{
+ struct hfsc_class *p;
+ struct rb_node *n;
+
+ for (n = rb_first(&cl->vt_tree); n != NULL; n = rb_next(n)) {
+ p = rb_entry(n, struct hfsc_class, vt_node);
+ if (p->cl_f <= cur_time)
+ return p;
+ }
+ return NULL;
+}
+
+/*
+ * get the leaf class with the minimum vt in the hierarchy
+ */
+static struct hfsc_class *
+vttree_get_minvt(struct hfsc_class *cl, u64 cur_time)
+{
+ /* if root-class's cfmin is bigger than cur_time nothing to do */
+ if (cl->cl_cfmin > cur_time)
+ return NULL;
+
+ while (cl->level > 0) {
+ cl = vttree_firstfit(cl, cur_time);
+ if (cl == NULL)
+ return NULL;
+ /*
+ * update parent's cl_cvtmin.
+ */
+ if (cl->cl_parent->cl_cvtmin < cl->cl_vt)
+ cl->cl_parent->cl_cvtmin = cl->cl_vt;
+ }
+ return cl;
+}
+
+static void
+cftree_insert(struct hfsc_class *cl)
+{
+ struct rb_node **p = &cl->cl_parent->cf_tree.rb_node;
+ struct rb_node *parent = NULL;
+ struct hfsc_class *cl1;
+
+ while (*p != NULL) {
+ parent = *p;
+ cl1 = rb_entry(parent, struct hfsc_class, cf_node);
+ if (cl->cl_f >= cl1->cl_f)
+ p = &parent->rb_right;
+ else
+ p = &parent->rb_left;
+ }
+ rb_link_node(&cl->cf_node, parent, p);
+ rb_insert_color(&cl->cf_node, &cl->cl_parent->cf_tree);
+}
+
+static inline void
+cftree_remove(struct hfsc_class *cl)
+{
+ rb_erase(&cl->cf_node, &cl->cl_parent->cf_tree);
+}
+
+static inline void
+cftree_update(struct hfsc_class *cl)
+{
+ cftree_remove(cl);
+ cftree_insert(cl);
+}
+
+/*
+ * service curve support functions
+ *
+ * external service curve parameters
+ * m: bps
+ * d: us
+ * internal service curve parameters
+ * sm: (bytes/psched_us) << SM_SHIFT
+ * ism: (psched_us/byte) << ISM_SHIFT
+ * dx: psched_us
+ *
+ * The clock source resolution with ktime and PSCHED_SHIFT 10 is 1.024us.
+ *
+ * sm and ism are scaled in order to keep effective digits.
+ * SM_SHIFT and ISM_SHIFT are selected to keep at least 4 effective
+ * digits in decimal using the following table.
+ *
+ * bits/sec 100Kbps 1Mbps 10Mbps 100Mbps 1Gbps
+ * ------------+-------------------------------------------------------
+ * bytes/1.024us 12.8e-3 128e-3 1280e-3 12800e-3 128000e-3
+ *
+ * 1.024us/byte 78.125 7.8125 0.78125 0.078125 0.0078125
+ *
+ * So, for PSCHED_SHIFT 10 we need: SM_SHIFT 20, ISM_SHIFT 18.
+ */
+#define SM_SHIFT (30 - PSCHED_SHIFT)
+#define ISM_SHIFT (8 + PSCHED_SHIFT)
+
+#define SM_MASK ((1ULL << SM_SHIFT) - 1)
+#define ISM_MASK ((1ULL << ISM_SHIFT) - 1)
+
+static inline u64
+seg_x2y(u64 x, u64 sm)
+{
+ u64 y;
+
+ /*
+ * compute
+ * y = x * sm >> SM_SHIFT
+ * but divide it for the upper and lower bits to avoid overflow
+ */
+ y = (x >> SM_SHIFT) * sm + (((x & SM_MASK) * sm) >> SM_SHIFT);
+ return y;
+}
+
+static inline u64
+seg_y2x(u64 y, u64 ism)
+{
+ u64 x;
+
+ if (y == 0)
+ x = 0;
+ else if (ism == HT_INFINITY)
+ x = HT_INFINITY;
+ else {
+ x = (y >> ISM_SHIFT) * ism
+ + (((y & ISM_MASK) * ism) >> ISM_SHIFT);
+ }
+ return x;
+}
+
+/* Convert m (bps) into sm (bytes/psched us) */
+static u64
+m2sm(u32 m)
+{
+ u64 sm;
+
+ sm = ((u64)m << SM_SHIFT);
+ sm += PSCHED_TICKS_PER_SEC - 1;
+ do_div(sm, PSCHED_TICKS_PER_SEC);
+ return sm;
+}
+
+/* convert m (bps) into ism (psched us/byte) */
+static u64
+m2ism(u32 m)
+{
+ u64 ism;
+
+ if (m == 0)
+ ism = HT_INFINITY;
+ else {
+ ism = ((u64)PSCHED_TICKS_PER_SEC << ISM_SHIFT);
+ ism += m - 1;
+ do_div(ism, m);
+ }
+ return ism;
+}
+
+/* convert d (us) into dx (psched us) */
+static u64
+d2dx(u32 d)
+{
+ u64 dx;
+
+ dx = ((u64)d * PSCHED_TICKS_PER_SEC);
+ dx += USEC_PER_SEC - 1;
+ do_div(dx, USEC_PER_SEC);
+ return dx;
+}
+
+/* convert sm (bytes/psched us) into m (bps) */
+static u32
+sm2m(u64 sm)
+{
+ u64 m;
+
+ m = (sm * PSCHED_TICKS_PER_SEC) >> SM_SHIFT;
+ return (u32)m;
+}
+
+/* convert dx (psched us) into d (us) */
+static u32
+dx2d(u64 dx)
+{
+ u64 d;
+
+ d = dx * USEC_PER_SEC;
+ do_div(d, PSCHED_TICKS_PER_SEC);
+ return (u32)d;
+}
+
+static void
+sc2isc(struct tc_service_curve *sc, struct internal_sc *isc)
+{
+ isc->sm1 = m2sm(sc->m1);
+ isc->ism1 = m2ism(sc->m1);
+ isc->dx = d2dx(sc->d);
+ isc->dy = seg_x2y(isc->dx, isc->sm1);
+ isc->sm2 = m2sm(sc->m2);
+ isc->ism2 = m2ism(sc->m2);
+}
+
+/*
+ * initialize the runtime service curve with the given internal
+ * service curve starting at (x, y).
+ */
+static void
+rtsc_init(struct runtime_sc *rtsc, struct internal_sc *isc, u64 x, u64 y)
+{
+ rtsc->x = x;
+ rtsc->y = y;
+ rtsc->sm1 = isc->sm1;
+ rtsc->ism1 = isc->ism1;
+ rtsc->dx = isc->dx;
+ rtsc->dy = isc->dy;
+ rtsc->sm2 = isc->sm2;
+ rtsc->ism2 = isc->ism2;
+}
+
+/*
+ * calculate the y-projection of the runtime service curve by the
+ * given x-projection value
+ */
+static u64
+rtsc_y2x(struct runtime_sc *rtsc, u64 y)
+{
+ u64 x;
+
+ if (y < rtsc->y)
+ x = rtsc->x;
+ else if (y <= rtsc->y + rtsc->dy) {
+ /* x belongs to the 1st segment */
+ if (rtsc->dy == 0)
+ x = rtsc->x + rtsc->dx;
+ else
+ x = rtsc->x + seg_y2x(y - rtsc->y, rtsc->ism1);
+ } else {
+ /* x belongs to the 2nd segment */
+ x = rtsc->x + rtsc->dx
+ + seg_y2x(y - rtsc->y - rtsc->dy, rtsc->ism2);
+ }
+ return x;
+}
+
+static u64
+rtsc_x2y(struct runtime_sc *rtsc, u64 x)
+{
+ u64 y;
+
+ if (x <= rtsc->x)
+ y = rtsc->y;
+ else if (x <= rtsc->x + rtsc->dx)
+ /* y belongs to the 1st segment */
+ y = rtsc->y + seg_x2y(x - rtsc->x, rtsc->sm1);
+ else
+ /* y belongs to the 2nd segment */
+ y = rtsc->y + rtsc->dy
+ + seg_x2y(x - rtsc->x - rtsc->dx, rtsc->sm2);
+ return y;
+}
+
+/*
+ * update the runtime service curve by taking the minimum of the current
+ * runtime service curve and the service curve starting at (x, y).
+ */
+static void
+rtsc_min(struct runtime_sc *rtsc, struct internal_sc *isc, u64 x, u64 y)
+{
+ u64 y1, y2, dx, dy;
+ u32 dsm;
+
+ if (isc->sm1 <= isc->sm2) {
+ /* service curve is convex */
+ y1 = rtsc_x2y(rtsc, x);
+ if (y1 < y)
+ /* the current rtsc is smaller */
+ return;
+ rtsc->x = x;
+ rtsc->y = y;
+ return;
+ }
+
+ /*
+ * service curve is concave
+ * compute the two y values of the current rtsc
+ * y1: at x
+ * y2: at (x + dx)
+ */
+ y1 = rtsc_x2y(rtsc, x);
+ if (y1 <= y) {
+ /* rtsc is below isc, no change to rtsc */
+ return;
+ }
+
+ y2 = rtsc_x2y(rtsc, x + isc->dx);
+ if (y2 >= y + isc->dy) {
+ /* rtsc is above isc, replace rtsc by isc */
+ rtsc->x = x;
+ rtsc->y = y;
+ rtsc->dx = isc->dx;
+ rtsc->dy = isc->dy;
+ return;
+ }
+
+ /*
+ * the two curves intersect
+ * compute the offsets (dx, dy) using the reverse
+ * function of seg_x2y()
+ * seg_x2y(dx, sm1) == seg_x2y(dx, sm2) + (y1 - y)
+ */
+ dx = (y1 - y) << SM_SHIFT;
+ dsm = isc->sm1 - isc->sm2;
+ do_div(dx, dsm);
+ /*
+ * check if (x, y1) belongs to the 1st segment of rtsc.
+ * if so, add the offset.
+ */
+ if (rtsc->x + rtsc->dx > x)
+ dx += rtsc->x + rtsc->dx - x;
+ dy = seg_x2y(dx, isc->sm1);
+
+ rtsc->x = x;
+ rtsc->y = y;
+ rtsc->dx = dx;
+ rtsc->dy = dy;
+}
+
+static void
+init_ed(struct hfsc_class *cl, unsigned int next_len)
+{
+ u64 cur_time = psched_get_time();
+
+ /* update the deadline curve */
+ rtsc_min(&cl->cl_deadline, &cl->cl_rsc, cur_time, cl->cl_cumul);
+
+ /*
+ * update the eligible curve.
+ * for concave, it is equal to the deadline curve.
+ * for convex, it is a linear curve with slope m2.
+ */
+ cl->cl_eligible = cl->cl_deadline;
+ if (cl->cl_rsc.sm1 <= cl->cl_rsc.sm2) {
+ cl->cl_eligible.dx = 0;
+ cl->cl_eligible.dy = 0;
+ }
+
+ /* compute e and d */
+ cl->cl_e = rtsc_y2x(&cl->cl_eligible, cl->cl_cumul);
+ cl->cl_d = rtsc_y2x(&cl->cl_deadline, cl->cl_cumul + next_len);
+
+ eltree_insert(cl);
+}
+
+static void
+update_ed(struct hfsc_class *cl, unsigned int next_len)
+{
+ cl->cl_e = rtsc_y2x(&cl->cl_eligible, cl->cl_cumul);
+ cl->cl_d = rtsc_y2x(&cl->cl_deadline, cl->cl_cumul + next_len);
+
+ eltree_update(cl);
+}
+
+static inline void
+update_d(struct hfsc_class *cl, unsigned int next_len)
+{
+ cl->cl_d = rtsc_y2x(&cl->cl_deadline, cl->cl_cumul + next_len);
+}
+
+static inline void
+update_cfmin(struct hfsc_class *cl)
+{
+ struct rb_node *n = rb_first(&cl->cf_tree);
+ struct hfsc_class *p;
+
+ if (n == NULL) {
+ cl->cl_cfmin = 0;
+ return;
+ }
+ p = rb_entry(n, struct hfsc_class, cf_node);
+ cl->cl_cfmin = p->cl_f;
+}
+
+static void
+init_vf(struct hfsc_class *cl, unsigned int len)
+{
+ struct hfsc_class *max_cl;
+ struct rb_node *n;
+ u64 vt, f, cur_time;
+ int go_active;
+
+ cur_time = 0;
+ go_active = 1;
+ for (; cl->cl_parent != NULL; cl = cl->cl_parent) {
+ if (go_active && cl->cl_nactive++ == 0)
+ go_active = 1;
+ else
+ go_active = 0;
+
+ if (go_active) {
+ n = rb_last(&cl->cl_parent->vt_tree);
+ if (n != NULL) {
+ max_cl = rb_entry(n, struct hfsc_class, vt_node);
+ /*
+ * set vt to the average of the min and max
+ * classes. if the parent's period didn't
+ * change, don't decrease vt of the class.
+ */
+ vt = max_cl->cl_vt;
+ if (cl->cl_parent->cl_cvtmin != 0)
+ vt = (cl->cl_parent->cl_cvtmin + vt)/2;
+
+ if (cl->cl_parent->cl_vtperiod !=
+ cl->cl_parentperiod || vt > cl->cl_vt)
+ cl->cl_vt = vt;
+ } else {
+ /*
+ * first child for a new parent backlog period.
+ * initialize cl_vt to the highest value seen
+ * among the siblings. this is analogous to
+ * what cur_time would provide in realtime case.
+ */
+ cl->cl_vt = cl->cl_parent->cl_cvtoff;
+ cl->cl_parent->cl_cvtmin = 0;
+ }
+
+ /* update the virtual curve */
+ rtsc_min(&cl->cl_virtual, &cl->cl_fsc, cl->cl_vt, cl->cl_total);
+ cl->cl_vtadj = 0;
+
+ cl->cl_vtperiod++; /* increment vt period */
+ cl->cl_parentperiod = cl->cl_parent->cl_vtperiod;
+ if (cl->cl_parent->cl_nactive == 0)
+ cl->cl_parentperiod++;
+ cl->cl_f = 0;
+
+ vttree_insert(cl);
+ cftree_insert(cl);
+
+ if (cl->cl_flags & HFSC_USC) {
+ /* class has upper limit curve */
+ if (cur_time == 0)
+ cur_time = psched_get_time();
+
+ /* update the ulimit curve */
+ rtsc_min(&cl->cl_ulimit, &cl->cl_usc, cur_time,
+ cl->cl_total);
+ /* compute myf */
+ cl->cl_myf = rtsc_y2x(&cl->cl_ulimit,
+ cl->cl_total);
+ }
+ }
+
+ f = max(cl->cl_myf, cl->cl_cfmin);
+ if (f != cl->cl_f) {
+ cl->cl_f = f;
+ cftree_update(cl);
+ }
+ update_cfmin(cl->cl_parent);
+ }
+}
+
+static void
+update_vf(struct hfsc_class *cl, unsigned int len, u64 cur_time)
+{
+ u64 f; /* , myf_bound, delta; */
+ int go_passive = 0;
+
+ if (cl->qdisc->q.qlen == 0 && cl->cl_flags & HFSC_FSC)
+ go_passive = 1;
+
+ for (; cl->cl_parent != NULL; cl = cl->cl_parent) {
+ cl->cl_total += len;
+
+ if (!(cl->cl_flags & HFSC_FSC) || cl->cl_nactive == 0)
+ continue;
+
+ if (go_passive && --cl->cl_nactive == 0)
+ go_passive = 1;
+ else
+ go_passive = 0;
+
+ /* update vt */
+ cl->cl_vt = rtsc_y2x(&cl->cl_virtual, cl->cl_total) + cl->cl_vtadj;
+
+ /*
+ * if vt of the class is smaller than cvtmin,
+ * the class was skipped in the past due to non-fit.
+ * if so, we need to adjust vtadj.
+ */
+ if (cl->cl_vt < cl->cl_parent->cl_cvtmin) {
+ cl->cl_vtadj += cl->cl_parent->cl_cvtmin - cl->cl_vt;
+ cl->cl_vt = cl->cl_parent->cl_cvtmin;
+ }
+
+ if (go_passive) {
+ /* no more active child, going passive */
+
+ /* update cvtoff of the parent class */
+ if (cl->cl_vt > cl->cl_parent->cl_cvtoff)
+ cl->cl_parent->cl_cvtoff = cl->cl_vt;
+
+ /* remove this class from the vt tree */
+ vttree_remove(cl);
+
+ cftree_remove(cl);
+ update_cfmin(cl->cl_parent);
+
+ continue;
+ }
+
+ /* update the vt tree */
+ vttree_update(cl);
+
+ /* update f */
+ if (cl->cl_flags & HFSC_USC) {
+ cl->cl_myf = rtsc_y2x(&cl->cl_ulimit, cl->cl_total);
+#if 0
+ cl->cl_myf = cl->cl_myfadj + rtsc_y2x(&cl->cl_ulimit,
+ cl->cl_total);
+ /*
+ * This code causes classes to stay way under their
+ * limit when multiple classes are used at gigabit
+ * speed. needs investigation. -kaber
+ */
+ /*
+ * if myf lags behind by more than one clock tick
+ * from the current time, adjust myfadj to prevent
+ * a rate-limited class from going greedy.
+ * in a steady state under rate-limiting, myf
+ * fluctuates within one clock tick.
+ */
+ myf_bound = cur_time - PSCHED_JIFFIE2US(1);
+ if (cl->cl_myf < myf_bound) {
+ delta = cur_time - cl->cl_myf;
+ cl->cl_myfadj += delta;
+ cl->cl_myf += delta;
+ }
+#endif
+ }
+
+ f = max(cl->cl_myf, cl->cl_cfmin);
+ if (f != cl->cl_f) {
+ cl->cl_f = f;
+ cftree_update(cl);
+ update_cfmin(cl->cl_parent);
+ }
+ }
+}
+
+static unsigned int
+qdisc_peek_len(struct Qdisc *sch)
+{
+ struct sk_buff *skb;
+ unsigned int len;
+
+ skb = sch->ops->peek(sch);
+ if (unlikely(skb == NULL)) {
+ qdisc_warn_nonwc("qdisc_peek_len", sch);
+ return 0;
+ }
+ len = qdisc_pkt_len(skb);
+
+ return len;
+}
+
+static void
+hfsc_adjust_levels(struct hfsc_class *cl)
+{
+ struct hfsc_class *p;
+ unsigned int level;
+
+ do {
+ level = 0;
+ list_for_each_entry(p, &cl->children, siblings) {
+ if (p->level >= level)
+ level = p->level + 1;
+ }
+ cl->level = level;
+ } while ((cl = cl->cl_parent) != NULL);
+}
+
+static inline struct hfsc_class *
+hfsc_find_class(u32 classid, struct Qdisc *sch)
+{
+ struct hfsc_sched *q = qdisc_priv(sch);
+ struct Qdisc_class_common *clc;
+
+ clc = qdisc_class_find(&q->clhash, classid);
+ if (clc == NULL)
+ return NULL;
+ return container_of(clc, struct hfsc_class, cl_common);
+}
+
+static void
+hfsc_change_rsc(struct hfsc_class *cl, struct tc_service_curve *rsc,
+ u64 cur_time)
+{
+ sc2isc(rsc, &cl->cl_rsc);
+ rtsc_init(&cl->cl_deadline, &cl->cl_rsc, cur_time, cl->cl_cumul);
+ cl->cl_eligible = cl->cl_deadline;
+ if (cl->cl_rsc.sm1 <= cl->cl_rsc.sm2) {
+ cl->cl_eligible.dx = 0;
+ cl->cl_eligible.dy = 0;
+ }
+ cl->cl_flags |= HFSC_RSC;
+}
+
+static void
+hfsc_change_fsc(struct hfsc_class *cl, struct tc_service_curve *fsc)
+{
+ sc2isc(fsc, &cl->cl_fsc);
+ rtsc_init(&cl->cl_virtual, &cl->cl_fsc, cl->cl_vt, cl->cl_total);
+ cl->cl_flags |= HFSC_FSC;
+}
+
+static void
+hfsc_change_usc(struct hfsc_class *cl, struct tc_service_curve *usc,
+ u64 cur_time)
+{
+ sc2isc(usc, &cl->cl_usc);
+ rtsc_init(&cl->cl_ulimit, &cl->cl_usc, cur_time, cl->cl_total);
+ cl->cl_flags |= HFSC_USC;
+}
+
+static void
+hfsc_upgrade_rt(struct hfsc_class *cl)
+{
+ cl->cl_fsc = cl->cl_rsc;
+ rtsc_init(&cl->cl_virtual, &cl->cl_fsc, cl->cl_vt, cl->cl_total);
+ cl->cl_flags |= HFSC_FSC;
+}
+
+static const struct nla_policy hfsc_policy[TCA_HFSC_MAX + 1] = {
+ [TCA_HFSC_RSC] = { .len = sizeof(struct tc_service_curve) },
+ [TCA_HFSC_FSC] = { .len = sizeof(struct tc_service_curve) },
+ [TCA_HFSC_USC] = { .len = sizeof(struct tc_service_curve) },
+};
+
+static int
+hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
+ struct nlattr **tca, unsigned long *arg,
+ struct netlink_ext_ack *extack)
+{
+ struct hfsc_sched *q = qdisc_priv(sch);
+ struct hfsc_class *cl = (struct hfsc_class *)*arg;
+ struct hfsc_class *parent = NULL;
+ struct nlattr *opt = tca[TCA_OPTIONS];
+ struct nlattr *tb[TCA_HFSC_MAX + 1];
+ struct tc_service_curve *rsc = NULL, *fsc = NULL, *usc = NULL;
+ u64 cur_time;
+ int err;
+
+ if (opt == NULL)
+ return -EINVAL;
+
+ err = nla_parse_nested_deprecated(tb, TCA_HFSC_MAX, opt, hfsc_policy,
+ NULL);
+ if (err < 0)
+ return err;
+
+ if (tb[TCA_HFSC_RSC]) {
+ rsc = nla_data(tb[TCA_HFSC_RSC]);
+ if (rsc->m1 == 0 && rsc->m2 == 0)
+ rsc = NULL;
+ }
+
+ if (tb[TCA_HFSC_FSC]) {
+ fsc = nla_data(tb[TCA_HFSC_FSC]);
+ if (fsc->m1 == 0 && fsc->m2 == 0)
+ fsc = NULL;
+ }
+
+ if (tb[TCA_HFSC_USC]) {
+ usc = nla_data(tb[TCA_HFSC_USC]);
+ if (usc->m1 == 0 && usc->m2 == 0)
+ usc = NULL;
+ }
+
+ if (cl != NULL) {
+ int old_flags;
+
+ if (parentid) {
+ if (cl->cl_parent &&
+ cl->cl_parent->cl_common.classid != parentid)
+ return -EINVAL;
+ if (cl->cl_parent == NULL && parentid != TC_H_ROOT)
+ return -EINVAL;
+ }
+ cur_time = psched_get_time();
+
+ if (tca[TCA_RATE]) {
+ err = gen_replace_estimator(&cl->bstats, NULL,
+ &cl->rate_est,
+ NULL,
+ true,
+ tca[TCA_RATE]);
+ if (err)
+ return err;
+ }
+
+ sch_tree_lock(sch);
+ old_flags = cl->cl_flags;
+
+ if (rsc != NULL)
+ hfsc_change_rsc(cl, rsc, cur_time);
+ if (fsc != NULL)
+ hfsc_change_fsc(cl, fsc);
+ if (usc != NULL)
+ hfsc_change_usc(cl, usc, cur_time);
+
+ if (cl->qdisc->q.qlen != 0) {
+ int len = qdisc_peek_len(cl->qdisc);
+
+ if (cl->cl_flags & HFSC_RSC) {
+ if (old_flags & HFSC_RSC)
+ update_ed(cl, len);
+ else
+ init_ed(cl, len);
+ }
+
+ if (cl->cl_flags & HFSC_FSC) {
+ if (old_flags & HFSC_FSC)
+ update_vf(cl, 0, cur_time);
+ else
+ init_vf(cl, len);
+ }
+ }
+ sch_tree_unlock(sch);
+
+ return 0;
+ }
+
+ if (parentid == TC_H_ROOT)
+ return -EEXIST;
+
+ parent = &q->root;
+ if (parentid) {
+ parent = hfsc_find_class(parentid, sch);
+ if (parent == NULL)
+ return -ENOENT;
+ }
+
+ if (classid == 0 || TC_H_MAJ(classid ^ sch->handle) != 0)
+ return -EINVAL;
+ if (hfsc_find_class(classid, sch))
+ return -EEXIST;
+
+ if (rsc == NULL && fsc == NULL)
+ return -EINVAL;
+
+ cl = kzalloc(sizeof(struct hfsc_class), GFP_KERNEL);
+ if (cl == NULL)
+ return -ENOBUFS;
+
+ err = tcf_block_get(&cl->block, &cl->filter_list, sch, extack);
+ if (err) {
+ kfree(cl);
+ return err;
+ }
+
+ if (tca[TCA_RATE]) {
+ err = gen_new_estimator(&cl->bstats, NULL, &cl->rate_est,
+ NULL, true, tca[TCA_RATE]);
+ if (err) {
+ tcf_block_put(cl->block);
+ kfree(cl);
+ return err;
+ }
+ }
+
+ if (rsc != NULL)
+ hfsc_change_rsc(cl, rsc, 0);
+ if (fsc != NULL)
+ hfsc_change_fsc(cl, fsc);
+ if (usc != NULL)
+ hfsc_change_usc(cl, usc, 0);
+
+ cl->cl_common.classid = classid;
+ cl->sched = q;
+ cl->cl_parent = parent;
+ cl->qdisc = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
+ classid, NULL);
+ if (cl->qdisc == NULL)
+ cl->qdisc = &noop_qdisc;
+ else
+ qdisc_hash_add(cl->qdisc, true);
+ INIT_LIST_HEAD(&cl->children);
+ cl->vt_tree = RB_ROOT;
+ cl->cf_tree = RB_ROOT;
+
+ sch_tree_lock(sch);
+ /* Check if the inner class is a misconfigured 'rt' */
+ if (!(parent->cl_flags & HFSC_FSC) && parent != &q->root) {
+ NL_SET_ERR_MSG(extack,
+ "Forced curve change on parent 'rt' to 'sc'");
+ hfsc_upgrade_rt(parent);
+ }
+ qdisc_class_hash_insert(&q->clhash, &cl->cl_common);
+ list_add_tail(&cl->siblings, &parent->children);
+ if (parent->level == 0)
+ qdisc_purge_queue(parent->qdisc);
+ hfsc_adjust_levels(parent);
+ sch_tree_unlock(sch);
+
+ qdisc_class_hash_grow(sch, &q->clhash);
+
+ *arg = (unsigned long)cl;
+ return 0;
+}
+
+static void
+hfsc_destroy_class(struct Qdisc *sch, struct hfsc_class *cl)
+{
+ struct hfsc_sched *q = qdisc_priv(sch);
+
+ tcf_block_put(cl->block);
+ qdisc_put(cl->qdisc);
+ gen_kill_estimator(&cl->rate_est);
+ if (cl != &q->root)
+ kfree(cl);
+}
+
+static int
+hfsc_delete_class(struct Qdisc *sch, unsigned long arg,
+ struct netlink_ext_ack *extack)
+{
+ struct hfsc_sched *q = qdisc_priv(sch);
+ struct hfsc_class *cl = (struct hfsc_class *)arg;
+
+ if (cl->level > 0 || qdisc_class_in_use(&cl->cl_common) ||
+ cl == &q->root) {
+ NL_SET_ERR_MSG(extack, "HFSC class in use");
+ return -EBUSY;
+ }
+
+ sch_tree_lock(sch);
+
+ list_del(&cl->siblings);
+ hfsc_adjust_levels(cl->cl_parent);
+
+ qdisc_purge_queue(cl->qdisc);
+ qdisc_class_hash_remove(&q->clhash, &cl->cl_common);
+
+ sch_tree_unlock(sch);
+
+ hfsc_destroy_class(sch, cl);
+ return 0;
+}
+
+static struct hfsc_class *
+hfsc_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
+{
+ struct hfsc_sched *q = qdisc_priv(sch);
+ struct hfsc_class *head, *cl;
+ struct tcf_result res;
+ struct tcf_proto *tcf;
+ int result;
+
+ if (TC_H_MAJ(skb->priority ^ sch->handle) == 0 &&
+ (cl = hfsc_find_class(skb->priority, sch)) != NULL)
+ if (cl->level == 0)
+ return cl;
+
+ *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
+ head = &q->root;
+ tcf = rcu_dereference_bh(q->root.filter_list);
+ while (tcf && (result = tcf_classify(skb, NULL, tcf, &res, false)) >= 0) {
+#ifdef CONFIG_NET_CLS_ACT
+ switch (result) {
+ case TC_ACT_QUEUED:
+ case TC_ACT_STOLEN:
+ case TC_ACT_TRAP:
+ *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
+ fallthrough;
+ case TC_ACT_SHOT:
+ return NULL;
+ }
+#endif
+ cl = (struct hfsc_class *)res.class;
+ if (!cl) {
+ cl = hfsc_find_class(res.classid, sch);
+ if (!cl)
+ break; /* filter selected invalid classid */
+ if (cl->level >= head->level)
+ break; /* filter may only point downwards */
+ }
+
+ if (cl->level == 0)
+ return cl; /* hit leaf class */
+
+ /* apply inner filter chain */
+ tcf = rcu_dereference_bh(cl->filter_list);
+ head = cl;
+ }
+
+ /* classification failed, try default class */
+ cl = hfsc_find_class(TC_H_MAKE(TC_H_MAJ(sch->handle), q->defcls), sch);
+ if (cl == NULL || cl->level > 0)
+ return NULL;
+
+ return cl;
+}
+
+static int
+hfsc_graft_class(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
+ struct Qdisc **old, struct netlink_ext_ack *extack)
+{
+ struct hfsc_class *cl = (struct hfsc_class *)arg;
+
+ if (cl->level > 0)
+ return -EINVAL;
+ if (new == NULL) {
+ new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
+ cl->cl_common.classid, NULL);
+ if (new == NULL)
+ new = &noop_qdisc;
+ }
+
+ *old = qdisc_replace(sch, new, &cl->qdisc);
+ return 0;
+}
+
+static struct Qdisc *
+hfsc_class_leaf(struct Qdisc *sch, unsigned long arg)
+{
+ struct hfsc_class *cl = (struct hfsc_class *)arg;
+
+ if (cl->level == 0)
+ return cl->qdisc;
+
+ return NULL;
+}
+
+static void
+hfsc_qlen_notify(struct Qdisc *sch, unsigned long arg)
+{
+ struct hfsc_class *cl = (struct hfsc_class *)arg;
+
+ /* vttree is now handled in update_vf() so that update_vf(cl, 0, 0)
+ * needs to be called explicitly to remove a class from vttree.
+ */
+ update_vf(cl, 0, 0);
+ if (cl->cl_flags & HFSC_RSC)
+ eltree_remove(cl);
+}
+
+static unsigned long
+hfsc_search_class(struct Qdisc *sch, u32 classid)
+{
+ return (unsigned long)hfsc_find_class(classid, sch);
+}
+
+static unsigned long
+hfsc_bind_tcf(struct Qdisc *sch, unsigned long parent, u32 classid)
+{
+ struct hfsc_class *p = (struct hfsc_class *)parent;
+ struct hfsc_class *cl = hfsc_find_class(classid, sch);
+
+ if (cl != NULL) {
+ if (p != NULL && p->level <= cl->level)
+ return 0;
+ qdisc_class_get(&cl->cl_common);
+ }
+
+ return (unsigned long)cl;
+}
+
+static void
+hfsc_unbind_tcf(struct Qdisc *sch, unsigned long arg)
+{
+ struct hfsc_class *cl = (struct hfsc_class *)arg;
+
+ qdisc_class_put(&cl->cl_common);
+}
+
+static struct tcf_block *hfsc_tcf_block(struct Qdisc *sch, unsigned long arg,
+ struct netlink_ext_ack *extack)
+{
+ struct hfsc_sched *q = qdisc_priv(sch);
+ struct hfsc_class *cl = (struct hfsc_class *)arg;
+
+ if (cl == NULL)
+ cl = &q->root;
+
+ return cl->block;
+}
+
+static int
+hfsc_dump_sc(struct sk_buff *skb, int attr, struct internal_sc *sc)
+{
+ struct tc_service_curve tsc;
+
+ tsc.m1 = sm2m(sc->sm1);
+ tsc.d = dx2d(sc->dx);
+ tsc.m2 = sm2m(sc->sm2);
+ if (nla_put(skb, attr, sizeof(tsc), &tsc))
+ goto nla_put_failure;
+
+ return skb->len;
+
+ nla_put_failure:
+ return -1;
+}
+
+static int
+hfsc_dump_curves(struct sk_buff *skb, struct hfsc_class *cl)
+{
+ if ((cl->cl_flags & HFSC_RSC) &&
+ (hfsc_dump_sc(skb, TCA_HFSC_RSC, &cl->cl_rsc) < 0))
+ goto nla_put_failure;
+
+ if ((cl->cl_flags & HFSC_FSC) &&
+ (hfsc_dump_sc(skb, TCA_HFSC_FSC, &cl->cl_fsc) < 0))
+ goto nla_put_failure;
+
+ if ((cl->cl_flags & HFSC_USC) &&
+ (hfsc_dump_sc(skb, TCA_HFSC_USC, &cl->cl_usc) < 0))
+ goto nla_put_failure;
+
+ return skb->len;
+
+ nla_put_failure:
+ return -1;
+}
+
+static int
+hfsc_dump_class(struct Qdisc *sch, unsigned long arg, struct sk_buff *skb,
+ struct tcmsg *tcm)
+{
+ struct hfsc_class *cl = (struct hfsc_class *)arg;
+ struct nlattr *nest;
+
+ tcm->tcm_parent = cl->cl_parent ? cl->cl_parent->cl_common.classid :
+ TC_H_ROOT;
+ tcm->tcm_handle = cl->cl_common.classid;
+ if (cl->level == 0)
+ tcm->tcm_info = cl->qdisc->handle;
+
+ nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
+ if (nest == NULL)
+ goto nla_put_failure;
+ if (hfsc_dump_curves(skb, cl) < 0)
+ goto nla_put_failure;
+ return nla_nest_end(skb, nest);
+
+ nla_put_failure:
+ nla_nest_cancel(skb, nest);
+ return -EMSGSIZE;
+}
+
+static int
+hfsc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
+ struct gnet_dump *d)
+{
+ struct hfsc_class *cl = (struct hfsc_class *)arg;
+ struct tc_hfsc_stats xstats;
+ __u32 qlen;
+
+ qdisc_qstats_qlen_backlog(cl->qdisc, &qlen, &cl->qstats.backlog);
+ xstats.level = cl->level;
+ xstats.period = cl->cl_vtperiod;
+ xstats.work = cl->cl_total;
+ xstats.rtwork = cl->cl_cumul;
+
+ if (gnet_stats_copy_basic(d, NULL, &cl->bstats, true) < 0 ||
+ gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
+ gnet_stats_copy_queue(d, NULL, &cl->qstats, qlen) < 0)
+ return -1;
+
+ return gnet_stats_copy_app(d, &xstats, sizeof(xstats));
+}
+
+
+
+static void
+hfsc_walk(struct Qdisc *sch, struct qdisc_walker *arg)
+{
+ struct hfsc_sched *q = qdisc_priv(sch);
+ struct hfsc_class *cl;
+ unsigned int i;
+
+ if (arg->stop)
+ return;
+
+ for (i = 0; i < q->clhash.hashsize; i++) {
+ hlist_for_each_entry(cl, &q->clhash.hash[i],
+ cl_common.hnode) {
+ if (!tc_qdisc_stats_dump(sch, (unsigned long)cl, arg))
+ return;
+ }
+ }
+}
+
+static void
+hfsc_schedule_watchdog(struct Qdisc *sch)
+{
+ struct hfsc_sched *q = qdisc_priv(sch);
+ struct hfsc_class *cl;
+ u64 next_time = 0;
+
+ cl = eltree_get_minel(q);
+ if (cl)
+ next_time = cl->cl_e;
+ if (q->root.cl_cfmin != 0) {
+ if (next_time == 0 || next_time > q->root.cl_cfmin)
+ next_time = q->root.cl_cfmin;
+ }
+ if (next_time)
+ qdisc_watchdog_schedule(&q->watchdog, next_time);
+}
+
+static int
+hfsc_init_qdisc(struct Qdisc *sch, struct nlattr *opt,
+ struct netlink_ext_ack *extack)
+{
+ struct hfsc_sched *q = qdisc_priv(sch);
+ struct tc_hfsc_qopt *qopt;
+ int err;
+
+ qdisc_watchdog_init(&q->watchdog, sch);
+
+ if (!opt || nla_len(opt) < sizeof(*qopt))
+ return -EINVAL;
+ qopt = nla_data(opt);
+
+ q->defcls = qopt->defcls;
+ err = qdisc_class_hash_init(&q->clhash);
+ if (err < 0)
+ return err;
+ q->eligible = RB_ROOT;
+
+ err = tcf_block_get(&q->root.block, &q->root.filter_list, sch, extack);
+ if (err)
+ return err;
+
+ gnet_stats_basic_sync_init(&q->root.bstats);
+ q->root.cl_common.classid = sch->handle;
+ q->root.sched = q;
+ q->root.qdisc = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
+ sch->handle, NULL);
+ if (q->root.qdisc == NULL)
+ q->root.qdisc = &noop_qdisc;
+ else
+ qdisc_hash_add(q->root.qdisc, true);
+ INIT_LIST_HEAD(&q->root.children);
+ q->root.vt_tree = RB_ROOT;
+ q->root.cf_tree = RB_ROOT;
+
+ qdisc_class_hash_insert(&q->clhash, &q->root.cl_common);
+ qdisc_class_hash_grow(sch, &q->clhash);
+
+ return 0;
+}
+
+static int
+hfsc_change_qdisc(struct Qdisc *sch, struct nlattr *opt,
+ struct netlink_ext_ack *extack)
+{
+ struct hfsc_sched *q = qdisc_priv(sch);
+ struct tc_hfsc_qopt *qopt;
+
+ if (nla_len(opt) < sizeof(*qopt))
+ return -EINVAL;
+ qopt = nla_data(opt);
+
+ sch_tree_lock(sch);
+ q->defcls = qopt->defcls;
+ sch_tree_unlock(sch);
+
+ return 0;
+}
+
+static void
+hfsc_reset_class(struct hfsc_class *cl)
+{
+ cl->cl_total = 0;
+ cl->cl_cumul = 0;
+ cl->cl_d = 0;
+ cl->cl_e = 0;
+ cl->cl_vt = 0;
+ cl->cl_vtadj = 0;
+ cl->cl_cvtmin = 0;
+ cl->cl_cvtoff = 0;
+ cl->cl_vtperiod = 0;
+ cl->cl_parentperiod = 0;
+ cl->cl_f = 0;
+ cl->cl_myf = 0;
+ cl->cl_cfmin = 0;
+ cl->cl_nactive = 0;
+
+ cl->vt_tree = RB_ROOT;
+ cl->cf_tree = RB_ROOT;
+ qdisc_reset(cl->qdisc);
+
+ if (cl->cl_flags & HFSC_RSC)
+ rtsc_init(&cl->cl_deadline, &cl->cl_rsc, 0, 0);
+ if (cl->cl_flags & HFSC_FSC)
+ rtsc_init(&cl->cl_virtual, &cl->cl_fsc, 0, 0);
+ if (cl->cl_flags & HFSC_USC)
+ rtsc_init(&cl->cl_ulimit, &cl->cl_usc, 0, 0);
+}
+
+static void
+hfsc_reset_qdisc(struct Qdisc *sch)
+{
+ struct hfsc_sched *q = qdisc_priv(sch);
+ struct hfsc_class *cl;
+ unsigned int i;
+
+ for (i = 0; i < q->clhash.hashsize; i++) {
+ hlist_for_each_entry(cl, &q->clhash.hash[i], cl_common.hnode)
+ hfsc_reset_class(cl);
+ }
+ q->eligible = RB_ROOT;
+ qdisc_watchdog_cancel(&q->watchdog);
+}
+
+static void
+hfsc_destroy_qdisc(struct Qdisc *sch)
+{
+ struct hfsc_sched *q = qdisc_priv(sch);
+ struct hlist_node *next;
+ struct hfsc_class *cl;
+ unsigned int i;
+
+ for (i = 0; i < q->clhash.hashsize; i++) {
+ hlist_for_each_entry(cl, &q->clhash.hash[i], cl_common.hnode) {
+ tcf_block_put(cl->block);
+ cl->block = NULL;
+ }
+ }
+ for (i = 0; i < q->clhash.hashsize; i++) {
+ hlist_for_each_entry_safe(cl, next, &q->clhash.hash[i],
+ cl_common.hnode)
+ hfsc_destroy_class(sch, cl);
+ }
+ qdisc_class_hash_destroy(&q->clhash);
+ qdisc_watchdog_cancel(&q->watchdog);
+}
+
+static int
+hfsc_dump_qdisc(struct Qdisc *sch, struct sk_buff *skb)
+{
+ struct hfsc_sched *q = qdisc_priv(sch);
+ unsigned char *b = skb_tail_pointer(skb);
+ struct tc_hfsc_qopt qopt;
+
+ qopt.defcls = q->defcls;
+ if (nla_put(skb, TCA_OPTIONS, sizeof(qopt), &qopt))
+ goto nla_put_failure;
+ return skb->len;
+
+ nla_put_failure:
+ nlmsg_trim(skb, b);
+ return -1;
+}
+
+static int
+hfsc_enqueue(struct sk_buff *skb, struct Qdisc *sch, struct sk_buff **to_free)
+{
+ unsigned int len = qdisc_pkt_len(skb);
+ struct hfsc_class *cl;
+ int err;
+ bool first;
+
+ cl = hfsc_classify(skb, sch, &err);
+ if (cl == NULL) {
+ if (err & __NET_XMIT_BYPASS)
+ qdisc_qstats_drop(sch);
+ __qdisc_drop(skb, to_free);
+ return err;
+ }
+
+ first = !cl->qdisc->q.qlen;
+ err = qdisc_enqueue(skb, cl->qdisc, to_free);
+ if (unlikely(err != NET_XMIT_SUCCESS)) {
+ if (net_xmit_drop_count(err)) {
+ cl->qstats.drops++;
+ qdisc_qstats_drop(sch);
+ }
+ return err;
+ }
+
+ if (first) {
+ if (cl->cl_flags & HFSC_RSC)
+ init_ed(cl, len);
+ if (cl->cl_flags & HFSC_FSC)
+ init_vf(cl, len);
+ /*
+ * If this is the first packet, isolate the head so an eventual
+ * head drop before the first dequeue operation has no chance
+ * to invalidate the deadline.
+ */
+ if (cl->cl_flags & HFSC_RSC)
+ cl->qdisc->ops->peek(cl->qdisc);
+
+ }
+
+ sch->qstats.backlog += len;
+ sch->q.qlen++;
+
+ return NET_XMIT_SUCCESS;
+}
+
+static struct sk_buff *
+hfsc_dequeue(struct Qdisc *sch)
+{
+ struct hfsc_sched *q = qdisc_priv(sch);
+ struct hfsc_class *cl;
+ struct sk_buff *skb;
+ u64 cur_time;
+ unsigned int next_len;
+ int realtime = 0;
+
+ if (sch->q.qlen == 0)
+ return NULL;
+
+ cur_time = psched_get_time();
+
+ /*
+ * if there are eligible classes, use real-time criteria.
+ * find the class with the minimum deadline among
+ * the eligible classes.
+ */
+ cl = eltree_get_mindl(q, cur_time);
+ if (cl) {
+ realtime = 1;
+ } else {
+ /*
+ * use link-sharing criteria
+ * get the class with the minimum vt in the hierarchy
+ */
+ cl = vttree_get_minvt(&q->root, cur_time);
+ if (cl == NULL) {
+ qdisc_qstats_overlimit(sch);
+ hfsc_schedule_watchdog(sch);
+ return NULL;
+ }
+ }
+
+ skb = qdisc_dequeue_peeked(cl->qdisc);
+ if (skb == NULL) {
+ qdisc_warn_nonwc("HFSC", cl->qdisc);
+ return NULL;
+ }
+
+ bstats_update(&cl->bstats, skb);
+ update_vf(cl, qdisc_pkt_len(skb), cur_time);
+ if (realtime)
+ cl->cl_cumul += qdisc_pkt_len(skb);
+
+ if (cl->cl_flags & HFSC_RSC) {
+ if (cl->qdisc->q.qlen != 0) {
+ /* update ed */
+ next_len = qdisc_peek_len(cl->qdisc);
+ if (realtime)
+ update_ed(cl, next_len);
+ else
+ update_d(cl, next_len);
+ } else {
+ /* the class becomes passive */
+ eltree_remove(cl);
+ }
+ }
+
+ qdisc_bstats_update(sch, skb);
+ qdisc_qstats_backlog_dec(sch, skb);
+ sch->q.qlen--;
+
+ return skb;
+}
+
+static const struct Qdisc_class_ops hfsc_class_ops = {
+ .change = hfsc_change_class,
+ .delete = hfsc_delete_class,
+ .graft = hfsc_graft_class,
+ .leaf = hfsc_class_leaf,
+ .qlen_notify = hfsc_qlen_notify,
+ .find = hfsc_search_class,
+ .bind_tcf = hfsc_bind_tcf,
+ .unbind_tcf = hfsc_unbind_tcf,
+ .tcf_block = hfsc_tcf_block,
+ .dump = hfsc_dump_class,
+ .dump_stats = hfsc_dump_class_stats,
+ .walk = hfsc_walk
+};
+
+static struct Qdisc_ops hfsc_qdisc_ops __read_mostly = {
+ .id = "hfsc",
+ .init = hfsc_init_qdisc,
+ .change = hfsc_change_qdisc,
+ .reset = hfsc_reset_qdisc,
+ .destroy = hfsc_destroy_qdisc,
+ .dump = hfsc_dump_qdisc,
+ .enqueue = hfsc_enqueue,
+ .dequeue = hfsc_dequeue,
+ .peek = qdisc_peek_dequeued,
+ .cl_ops = &hfsc_class_ops,
+ .priv_size = sizeof(struct hfsc_sched),
+ .owner = THIS_MODULE
+};
+
+static int __init
+hfsc_init(void)
+{
+ return register_qdisc(&hfsc_qdisc_ops);
+}
+
+static void __exit
+hfsc_cleanup(void)
+{
+ unregister_qdisc(&hfsc_qdisc_ops);
+}
+
+MODULE_LICENSE("GPL");
+module_init(hfsc_init);
+module_exit(hfsc_cleanup);