mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
444 lines
9.7 KiB
444 lines
9.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* net/sched/sch_prio.c Simple 3-band priority "scheduler". |
|
* |
|
* Authors: Alexey Kuznetsov, <[email protected]> |
|
* Fixes: 19990609: J Hadi Salim <[email protected]>: |
|
* Init -- EINVAL when opt undefined |
|
*/ |
|
|
|
#include <linux/module.h> |
|
#include <linux/slab.h> |
|
#include <linux/types.h> |
|
#include <linux/kernel.h> |
|
#include <linux/string.h> |
|
#include <linux/errno.h> |
|
#include <linux/skbuff.h> |
|
#include <net/netlink.h> |
|
#include <net/pkt_sched.h> |
|
#include <net/pkt_cls.h> |
|
|
|
struct prio_sched_data { |
|
int bands; |
|
struct tcf_proto __rcu *filter_list; |
|
struct tcf_block *block; |
|
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; |
|
struct tcf_proto *fl; |
|
int err; |
|
|
|
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
|
if (TC_H_MAJ(skb->priority) != sch->handle) { |
|
fl = rcu_dereference_bh(q->filter_list); |
|
err = tcf_classify(skb, NULL, fl, &res, false); |
|
#ifdef CONFIG_NET_CLS_ACT |
|
switch (err) { |
|
case TC_ACT_STOLEN: |
|
case TC_ACT_QUEUED: |
|
case TC_ACT_TRAP: |
|
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
|
fallthrough; |
|
case TC_ACT_SHOT: |
|
return NULL; |
|
} |
|
#endif |
|
if (!fl || err < 0) { |
|
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 sk_buff **to_free) |
|
{ |
|
unsigned int len = qdisc_pkt_len(skb); |
|
struct Qdisc *qdisc; |
|
int ret; |
|
|
|
qdisc = prio_classify(skb, sch, &ret); |
|
#ifdef CONFIG_NET_CLS_ACT |
|
if (qdisc == NULL) { |
|
|
|
if (ret & __NET_XMIT_BYPASS) |
|
qdisc_qstats_drop(sch); |
|
__qdisc_drop(skb, to_free); |
|
return ret; |
|
} |
|
#endif |
|
|
|
ret = qdisc_enqueue(skb, qdisc, to_free); |
|
if (ret == NET_XMIT_SUCCESS) { |
|
sch->qstats.backlog += len; |
|
sch->q.qlen++; |
|
return NET_XMIT_SUCCESS; |
|
} |
|
if (net_xmit_drop_count(ret)) |
|
qdisc_qstats_drop(sch); |
|
return ret; |
|
} |
|
|
|
static struct sk_buff *prio_peek(struct Qdisc *sch) |
|
{ |
|
struct prio_sched_data *q = qdisc_priv(sch); |
|
int prio; |
|
|
|
for (prio = 0; prio < q->bands; prio++) { |
|
struct Qdisc *qdisc = q->queues[prio]; |
|
struct sk_buff *skb = qdisc->ops->peek(qdisc); |
|
if (skb) |
|
return skb; |
|
} |
|
return NULL; |
|
} |
|
|
|
static struct sk_buff *prio_dequeue(struct Qdisc *sch) |
|
{ |
|
struct prio_sched_data *q = qdisc_priv(sch); |
|
int prio; |
|
|
|
for (prio = 0; prio < q->bands; prio++) { |
|
struct Qdisc *qdisc = q->queues[prio]; |
|
struct sk_buff *skb = qdisc_dequeue_peeked(qdisc); |
|
if (skb) { |
|
qdisc_bstats_update(sch, skb); |
|
qdisc_qstats_backlog_dec(sch, skb); |
|
sch->q.qlen--; |
|
return skb; |
|
} |
|
} |
|
return NULL; |
|
|
|
} |
|
|
|
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->qstats.backlog = 0; |
|
sch->q.qlen = 0; |
|
} |
|
|
|
static int prio_offload(struct Qdisc *sch, struct tc_prio_qopt *qopt) |
|
{ |
|
struct net_device *dev = qdisc_dev(sch); |
|
struct tc_prio_qopt_offload opt = { |
|
.handle = sch->handle, |
|
.parent = sch->parent, |
|
}; |
|
|
|
if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) |
|
return -EOPNOTSUPP; |
|
|
|
if (qopt) { |
|
opt.command = TC_PRIO_REPLACE; |
|
opt.replace_params.bands = qopt->bands; |
|
memcpy(&opt.replace_params.priomap, qopt->priomap, |
|
TC_PRIO_MAX + 1); |
|
opt.replace_params.qstats = &sch->qstats; |
|
} else { |
|
opt.command = TC_PRIO_DESTROY; |
|
} |
|
|
|
return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_PRIO, &opt); |
|
} |
|
|
|
static void |
|
prio_destroy(struct Qdisc *sch) |
|
{ |
|
int prio; |
|
struct prio_sched_data *q = qdisc_priv(sch); |
|
|
|
tcf_block_put(q->block); |
|
prio_offload(sch, NULL); |
|
for (prio = 0; prio < q->bands; prio++) |
|
qdisc_put(q->queues[prio]); |
|
} |
|
|
|
static int prio_tune(struct Qdisc *sch, struct nlattr *opt, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct prio_sched_data *q = qdisc_priv(sch); |
|
struct Qdisc *queues[TCQ_PRIO_BANDS]; |
|
int oldbands = q->bands, i; |
|
struct tc_prio_qopt *qopt; |
|
|
|
if (nla_len(opt) < sizeof(*qopt)) |
|
return -EINVAL; |
|
qopt = nla_data(opt); |
|
|
|
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; |
|
} |
|
|
|
/* Before commit, make sure we can allocate all new qdiscs */ |
|
for (i = oldbands; i < qopt->bands; i++) { |
|
queues[i] = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, |
|
TC_H_MAKE(sch->handle, i + 1), |
|
extack); |
|
if (!queues[i]) { |
|
while (i > oldbands) |
|
qdisc_put(queues[--i]); |
|
return -ENOMEM; |
|
} |
|
} |
|
|
|
prio_offload(sch, qopt); |
|
sch_tree_lock(sch); |
|
q->bands = qopt->bands; |
|
memcpy(q->prio2band, qopt->priomap, TC_PRIO_MAX+1); |
|
|
|
for (i = q->bands; i < oldbands; i++) |
|
qdisc_tree_flush_backlog(q->queues[i]); |
|
|
|
for (i = oldbands; i < q->bands; i++) { |
|
q->queues[i] = queues[i]; |
|
if (q->queues[i] != &noop_qdisc) |
|
qdisc_hash_add(q->queues[i], true); |
|
} |
|
|
|
sch_tree_unlock(sch); |
|
|
|
for (i = q->bands; i < oldbands; i++) |
|
qdisc_put(q->queues[i]); |
|
return 0; |
|
} |
|
|
|
static int prio_init(struct Qdisc *sch, struct nlattr *opt, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct prio_sched_data *q = qdisc_priv(sch); |
|
int err; |
|
|
|
if (!opt) |
|
return -EINVAL; |
|
|
|
err = tcf_block_get(&q->block, &q->filter_list, sch, extack); |
|
if (err) |
|
return err; |
|
|
|
return prio_tune(sch, opt, extack); |
|
} |
|
|
|
static int prio_dump_offload(struct Qdisc *sch) |
|
{ |
|
struct tc_prio_qopt_offload hw_stats = { |
|
.command = TC_PRIO_STATS, |
|
.handle = sch->handle, |
|
.parent = sch->parent, |
|
{ |
|
.stats = { |
|
.bstats = &sch->bstats, |
|
.qstats = &sch->qstats, |
|
}, |
|
}, |
|
}; |
|
|
|
return qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_PRIO, &hw_stats); |
|
} |
|
|
|
static int prio_dump(struct Qdisc *sch, struct sk_buff *skb) |
|
{ |
|
struct prio_sched_data *q = qdisc_priv(sch); |
|
unsigned char *b = skb_tail_pointer(skb); |
|
struct tc_prio_qopt opt; |
|
int err; |
|
|
|
opt.bands = q->bands; |
|
memcpy(&opt.priomap, q->prio2band, TC_PRIO_MAX + 1); |
|
|
|
err = prio_dump_offload(sch); |
|
if (err) |
|
goto nla_put_failure; |
|
|
|
if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
|
goto nla_put_failure; |
|
|
|
return skb->len; |
|
|
|
nla_put_failure: |
|
nlmsg_trim(skb, b); |
|
return -1; |
|
} |
|
|
|
static int prio_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, |
|
struct Qdisc **old, struct netlink_ext_ack *extack) |
|
{ |
|
struct prio_sched_data *q = qdisc_priv(sch); |
|
struct tc_prio_qopt_offload graft_offload; |
|
unsigned long band = arg - 1; |
|
|
|
if (!new) { |
|
new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, |
|
TC_H_MAKE(sch->handle, arg), extack); |
|
if (!new) |
|
new = &noop_qdisc; |
|
else |
|
qdisc_hash_add(new, true); |
|
} |
|
|
|
*old = qdisc_replace(sch, new, &q->queues[band]); |
|
|
|
graft_offload.handle = sch->handle; |
|
graft_offload.parent = sch->parent; |
|
graft_offload.graft_params.band = band; |
|
graft_offload.graft_params.child_handle = new->handle; |
|
graft_offload.command = TC_PRIO_GRAFT; |
|
|
|
qdisc_offload_graft_helper(qdisc_dev(sch), sch, new, *old, |
|
TC_SETUP_QDISC_PRIO, &graft_offload, |
|
extack); |
|
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; |
|
|
|
return q->queues[band]; |
|
} |
|
|
|
static unsigned long prio_find(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_find(sch, classid); |
|
} |
|
|
|
|
|
static void prio_unbind(struct Qdisc *q, unsigned long cl) |
|
{ |
|
} |
|
|
|
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); |
|
|
|
tcm->tcm_handle |= TC_H_MIN(cl); |
|
tcm->tcm_info = q->queues[cl-1]->handle; |
|
return 0; |
|
} |
|
|
|
static int prio_dump_class_stats(struct Qdisc *sch, unsigned long cl, |
|
struct gnet_dump *d) |
|
{ |
|
struct prio_sched_data *q = qdisc_priv(sch); |
|
struct Qdisc *cl_q; |
|
|
|
cl_q = q->queues[cl - 1]; |
|
if (gnet_stats_copy_basic(d, cl_q->cpu_bstats, |
|
&cl_q->bstats, true) < 0 || |
|
qdisc_qstats_copy(d, cl_q) < 0) |
|
return -1; |
|
|
|
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_block *prio_tcf_block(struct Qdisc *sch, unsigned long cl, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct prio_sched_data *q = qdisc_priv(sch); |
|
|
|
if (cl) |
|
return NULL; |
|
return q->block; |
|
} |
|
|
|
static const struct Qdisc_class_ops prio_class_ops = { |
|
.graft = prio_graft, |
|
.leaf = prio_leaf, |
|
.find = prio_find, |
|
.walk = prio_walk, |
|
.tcf_block = prio_tcf_block, |
|
.bind_tcf = prio_bind, |
|
.unbind_tcf = prio_unbind, |
|
.dump = prio_dump_class, |
|
.dump_stats = prio_dump_class_stats, |
|
}; |
|
|
|
static struct Qdisc_ops prio_qdisc_ops __read_mostly = { |
|
.next = NULL, |
|
.cl_ops = &prio_class_ops, |
|
.id = "prio", |
|
.priv_size = sizeof(struct prio_sched_data), |
|
.enqueue = prio_enqueue, |
|
.dequeue = prio_dequeue, |
|
.peek = prio_peek, |
|
.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");
|
|
|