diff options
Diffstat (limited to 'net/sched/sch_prio.c')
| -rw-r--r-- | net/sched/sch_prio.c | 444 |
1 files changed, 444 insertions, 0 deletions
diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c new file mode 100644 index 000000000000..3ac0f495bad0 --- /dev/null +++ b/net/sched/sch_prio.c @@ -0,0 +1,444 @@ +/* + * net/sched/sch_prio.c Simple 3-band priority "scheduler". + * + * 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. + * + * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> + * Fixes: 19990609: J Hadi Salim <hadi@nortelnetworks.com>: + * Init -- EINVAL when opt undefined + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <asm/uaccess.h> +#include <asm/system.h> +#include <linux/bitops.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/socket.h> +#include <linux/sockios.h> +#include <linux/in.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/if_ether.h> +#include <linux/inet.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/notifier.h> +#include <net/ip.h> +#include <net/route.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <net/pkt_sched.h> + + +struct prio_sched_data +{ + int bands; + struct tcf_proto *filter_list; + u8 prio2band[TC_PRIO_MAX+1]; + struct Qdisc *queues[TCQ_PRIO_BANDS]; +}; + + +static struct Qdisc * +prio_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) +{ + struct prio_sched_data *q = qdisc_priv(sch); + u32 band = skb->priority; + struct tcf_result res; + + *qerr = NET_XMIT_DROP; + if (TC_H_MAJ(skb->priority) != sch->handle) { +#ifdef CONFIG_NET_CLS_ACT + switch (tc_classify(skb, q->filter_list, &res)) { + case TC_ACT_STOLEN: + case TC_ACT_QUEUED: + *qerr = NET_XMIT_SUCCESS; + case TC_ACT_SHOT: + return NULL; + }; + + if (!q->filter_list ) { +#else + if (!q->filter_list || tc_classify(skb, q->filter_list, &res)) { +#endif + if (TC_H_MAJ(band)) + band = 0; + return q->queues[q->prio2band[band&TC_PRIO_MAX]]; + } + band = res.classid; + } + band = TC_H_MIN(band) - 1; + if (band > q->bands) + return q->queues[q->prio2band[0]]; + + return q->queues[band]; +} + +static int +prio_enqueue(struct sk_buff *skb, struct Qdisc *sch) +{ + struct Qdisc *qdisc; + int ret; + + qdisc = prio_classify(skb, sch, &ret); +#ifdef CONFIG_NET_CLS_ACT + if (qdisc == NULL) { + if (ret == NET_XMIT_DROP) + sch->qstats.drops++; + kfree_skb(skb); + return ret; + } +#endif + + if ((ret = qdisc->enqueue(skb, qdisc)) == NET_XMIT_SUCCESS) { + sch->bstats.bytes += skb->len; + sch->bstats.packets++; + sch->q.qlen++; + return NET_XMIT_SUCCESS; + } + sch->qstats.drops++; + return ret; +} + + +static int +prio_requeue(struct sk_buff *skb, struct Qdisc* sch) +{ + struct Qdisc *qdisc; + int ret; + + qdisc = prio_classify(skb, sch, &ret); +#ifdef CONFIG_NET_CLS_ACT + if (qdisc == NULL) { + if (ret == NET_XMIT_DROP) + sch->qstats.drops++; + kfree_skb(skb); + return ret; + } +#endif + + if ((ret = qdisc->ops->requeue(skb, qdisc)) == NET_XMIT_SUCCESS) { + sch->q.qlen++; + sch->qstats.requeues++; + return 0; + } + sch->qstats.drops++; + return NET_XMIT_DROP; +} + + +static struct sk_buff * +prio_dequeue(struct Qdisc* sch) +{ + struct sk_buff *skb; + struct prio_sched_data *q = qdisc_priv(sch); + int prio; + struct Qdisc *qdisc; + + for (prio = 0; prio < q->bands; prio++) { + qdisc = q->queues[prio]; + skb = qdisc->dequeue(qdisc); + if (skb) { + sch->q.qlen--; + return skb; + } + } + return NULL; + +} + +static unsigned int prio_drop(struct Qdisc* sch) +{ + struct prio_sched_data *q = qdisc_priv(sch); + int prio; + unsigned int len; + struct Qdisc *qdisc; + + for (prio = q->bands-1; prio >= 0; prio--) { + qdisc = q->queues[prio]; + if ((len = qdisc->ops->drop(qdisc)) != 0) { + sch->q.qlen--; + return len; + } + } + return 0; +} + + +static void +prio_reset(struct Qdisc* sch) +{ + int prio; + struct prio_sched_data *q = qdisc_priv(sch); + + for (prio=0; prio<q->bands; prio++) + qdisc_reset(q->queues[prio]); + sch->q.qlen = 0; +} + +static void +prio_destroy(struct Qdisc* sch) +{ + int prio; + struct prio_sched_data *q = qdisc_priv(sch); + struct tcf_proto *tp; + + while ((tp = q->filter_list) != NULL) { + q->filter_list = tp->next; + tcf_destroy(tp); + } + + for (prio=0; prio<q->bands; prio++) + qdisc_destroy(q->queues[prio]); +} + +static int prio_tune(struct Qdisc *sch, struct rtattr *opt) +{ + struct prio_sched_data *q = qdisc_priv(sch); + struct tc_prio_qopt *qopt = RTA_DATA(opt); + int i; + + if (opt->rta_len < RTA_LENGTH(sizeof(*qopt))) + return -EINVAL; + if (qopt->bands > TCQ_PRIO_BANDS || qopt->bands < 2) + return -EINVAL; + + for (i=0; i<=TC_PRIO_MAX; i++) { + if (qopt->priomap[i] >= qopt->bands) + return -EINVAL; + } + + sch_tree_lock(sch); + q->bands = qopt->bands; + memcpy(q->prio2band, qopt->priomap, TC_PRIO_MAX+1); + + for (i=q->bands; i<TCQ_PRIO_BANDS; i++) { + struct Qdisc *child = xchg(&q->queues[i], &noop_qdisc); + if (child != &noop_qdisc) + qdisc_destroy(child); + } + sch_tree_unlock(sch); + + for (i=0; i<=TC_PRIO_MAX; i++) { + int band = q->prio2band[i]; + if (q->queues[band] == &noop_qdisc) { + struct Qdisc *child; + child = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops); + if (child) { + sch_tree_lock(sch); + child = xchg(&q->queues[band], child); + + if (child != &noop_qdisc) + qdisc_destroy(child); + sch_tree_unlock(sch); + } + } + } + return 0; +} + +static int prio_init(struct Qdisc *sch, struct rtattr *opt) +{ + struct prio_sched_data *q = qdisc_priv(sch); + int i; + + for (i=0; i<TCQ_PRIO_BANDS; i++) + q->queues[i] = &noop_qdisc; + + if (opt == NULL) { + return -EINVAL; + } else { + int err; + + if ((err= prio_tune(sch, opt)) != 0) + return err; + } + return 0; +} + +static int prio_dump(struct Qdisc *sch, struct sk_buff *skb) +{ + struct prio_sched_data *q = qdisc_priv(sch); + unsigned char *b = skb->tail; + struct tc_prio_qopt opt; + + opt.bands = q->bands; + memcpy(&opt.priomap, q->prio2band, TC_PRIO_MAX+1); + RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt); + return skb->len; + +rtattr_failure: + skb_trim(skb, b - skb->data); + return -1; +} + +static int prio_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, + struct Qdisc **old) +{ + struct prio_sched_data *q = qdisc_priv(sch); + unsigned long band = arg - 1; + + if (band >= q->bands) + return -EINVAL; + + if (new == NULL) + new = &noop_qdisc; + + sch_tree_lock(sch); + *old = q->queues[band]; + q->queues[band] = new; + sch->q.qlen -= (*old)->q.qlen; + qdisc_reset(*old); + sch_tree_unlock(sch); + + return 0; +} + +static struct Qdisc * +prio_leaf(struct Qdisc *sch, unsigned long arg) +{ + struct prio_sched_data *q = qdisc_priv(sch); + unsigned long band = arg - 1; + + if (band >= q->bands) + return NULL; + + return q->queues[band]; +} + +static unsigned long prio_get(struct Qdisc *sch, u32 classid) +{ + struct prio_sched_data *q = qdisc_priv(sch); + unsigned long band = TC_H_MIN(classid); + + if (band - 1 >= q->bands) + return 0; + return band; +} + +static unsigned long prio_bind(struct Qdisc *sch, unsigned long parent, u32 classid) +{ + return prio_get(sch, classid); +} + + +static void prio_put(struct Qdisc *q, unsigned long cl) +{ + return; +} + +static int prio_change(struct Qdisc *sch, u32 handle, u32 parent, struct rtattr **tca, unsigned long *arg) +{ + unsigned long cl = *arg; + struct prio_sched_data *q = qdisc_priv(sch); + + if (cl - 1 > q->bands) + return -ENOENT; + return 0; +} + +static int prio_delete(struct Qdisc *sch, unsigned long cl) +{ + struct prio_sched_data *q = qdisc_priv(sch); + if (cl - 1 > q->bands) + return -ENOENT; + return 0; +} + + +static int prio_dump_class(struct Qdisc *sch, unsigned long cl, struct sk_buff *skb, + struct tcmsg *tcm) +{ + struct prio_sched_data *q = qdisc_priv(sch); + + if (cl - 1 > q->bands) + return -ENOENT; + tcm->tcm_handle |= TC_H_MIN(cl); + if (q->queues[cl-1]) + tcm->tcm_info = q->queues[cl-1]->handle; + return 0; +} + +static void prio_walk(struct Qdisc *sch, struct qdisc_walker *arg) +{ + struct prio_sched_data *q = qdisc_priv(sch); + int prio; + + if (arg->stop) + return; + + for (prio = 0; prio < q->bands; prio++) { + if (arg->count < arg->skip) { + arg->count++; + continue; + } + if (arg->fn(sch, prio+1, arg) < 0) { + arg->stop = 1; + break; + } + arg->count++; + } +} + +static struct tcf_proto ** prio_find_tcf(struct Qdisc *sch, unsigned long cl) +{ + struct prio_sched_data *q = qdisc_priv(sch); + + if (cl) + return NULL; + return &q->filter_list; +} + +static struct Qdisc_class_ops prio_class_ops = { + .graft = prio_graft, + .leaf = prio_leaf, + .get = prio_get, + .put = prio_put, + .change = prio_change, + .delete = prio_delete, + .walk = prio_walk, + .tcf_chain = prio_find_tcf, + .bind_tcf = prio_bind, + .unbind_tcf = prio_put, + .dump = prio_dump_class, +}; + +static struct Qdisc_ops prio_qdisc_ops = { + .next = NULL, + .cl_ops = &prio_class_ops, + .id = "prio", + .priv_size = sizeof(struct prio_sched_data), + .enqueue = prio_enqueue, + .dequeue = prio_dequeue, + .requeue = prio_requeue, + .drop = prio_drop, + .init = prio_init, + .reset = prio_reset, + .destroy = prio_destroy, + .change = prio_tune, + .dump = prio_dump, + .owner = THIS_MODULE, +}; + +static int __init prio_module_init(void) +{ + return register_qdisc(&prio_qdisc_ops); +} + +static void __exit prio_module_exit(void) +{ + unregister_qdisc(&prio_qdisc_ops); +} + +module_init(prio_module_init) +module_exit(prio_module_exit) + +MODULE_LICENSE("GPL"); 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