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.
293 lines
7.1 KiB
293 lines
7.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* net/sched/sch_mq.c Classful multiqueue dummy scheduler |
|
* |
|
* Copyright (c) 2009 Patrick McHardy <[email protected]> |
|
*/ |
|
|
|
#include <linux/types.h> |
|
#include <linux/slab.h> |
|
#include <linux/kernel.h> |
|
#include <linux/export.h> |
|
#include <linux/string.h> |
|
#include <linux/errno.h> |
|
#include <linux/skbuff.h> |
|
#include <net/netlink.h> |
|
#include <net/pkt_cls.h> |
|
#include <net/pkt_sched.h> |
|
#include <net/sch_generic.h> |
|
|
|
struct mq_sched { |
|
struct Qdisc **qdiscs; |
|
}; |
|
|
|
static int mq_offload(struct Qdisc *sch, enum tc_mq_command cmd) |
|
{ |
|
struct net_device *dev = qdisc_dev(sch); |
|
struct tc_mq_qopt_offload opt = { |
|
.command = cmd, |
|
.handle = sch->handle, |
|
}; |
|
|
|
if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) |
|
return -EOPNOTSUPP; |
|
|
|
return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_MQ, &opt); |
|
} |
|
|
|
static int mq_offload_stats(struct Qdisc *sch) |
|
{ |
|
struct tc_mq_qopt_offload opt = { |
|
.command = TC_MQ_STATS, |
|
.handle = sch->handle, |
|
.stats = { |
|
.bstats = &sch->bstats, |
|
.qstats = &sch->qstats, |
|
}, |
|
}; |
|
|
|
return qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_MQ, &opt); |
|
} |
|
|
|
static void mq_destroy(struct Qdisc *sch) |
|
{ |
|
struct net_device *dev = qdisc_dev(sch); |
|
struct mq_sched *priv = qdisc_priv(sch); |
|
unsigned int ntx; |
|
|
|
mq_offload(sch, TC_MQ_DESTROY); |
|
|
|
if (!priv->qdiscs) |
|
return; |
|
for (ntx = 0; ntx < dev->num_tx_queues && priv->qdiscs[ntx]; ntx++) |
|
qdisc_put(priv->qdiscs[ntx]); |
|
kfree(priv->qdiscs); |
|
} |
|
|
|
static int mq_init(struct Qdisc *sch, struct nlattr *opt, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct net_device *dev = qdisc_dev(sch); |
|
struct mq_sched *priv = qdisc_priv(sch); |
|
struct netdev_queue *dev_queue; |
|
struct Qdisc *qdisc; |
|
unsigned int ntx; |
|
|
|
if (sch->parent != TC_H_ROOT) |
|
return -EOPNOTSUPP; |
|
|
|
if (!netif_is_multiqueue(dev)) |
|
return -EOPNOTSUPP; |
|
|
|
/* pre-allocate qdiscs, attachment can't fail */ |
|
priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]), |
|
GFP_KERNEL); |
|
if (!priv->qdiscs) |
|
return -ENOMEM; |
|
|
|
for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { |
|
dev_queue = netdev_get_tx_queue(dev, ntx); |
|
qdisc = qdisc_create_dflt(dev_queue, get_default_qdisc_ops(dev, ntx), |
|
TC_H_MAKE(TC_H_MAJ(sch->handle), |
|
TC_H_MIN(ntx + 1)), |
|
extack); |
|
if (!qdisc) |
|
return -ENOMEM; |
|
priv->qdiscs[ntx] = qdisc; |
|
qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; |
|
} |
|
|
|
sch->flags |= TCQ_F_MQROOT; |
|
|
|
mq_offload(sch, TC_MQ_CREATE); |
|
return 0; |
|
} |
|
|
|
static void mq_attach(struct Qdisc *sch) |
|
{ |
|
struct net_device *dev = qdisc_dev(sch); |
|
struct mq_sched *priv = qdisc_priv(sch); |
|
struct Qdisc *qdisc, *old; |
|
unsigned int ntx; |
|
|
|
for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { |
|
qdisc = priv->qdiscs[ntx]; |
|
old = dev_graft_qdisc(qdisc->dev_queue, qdisc); |
|
if (old) |
|
qdisc_put(old); |
|
#ifdef CONFIG_NET_SCHED |
|
if (ntx < dev->real_num_tx_queues) |
|
qdisc_hash_add(qdisc, false); |
|
#endif |
|
|
|
} |
|
kfree(priv->qdiscs); |
|
priv->qdiscs = NULL; |
|
} |
|
|
|
static int mq_dump(struct Qdisc *sch, struct sk_buff *skb) |
|
{ |
|
struct net_device *dev = qdisc_dev(sch); |
|
struct Qdisc *qdisc; |
|
unsigned int ntx; |
|
__u32 qlen = 0; |
|
|
|
sch->q.qlen = 0; |
|
memset(&sch->bstats, 0, sizeof(sch->bstats)); |
|
memset(&sch->qstats, 0, sizeof(sch->qstats)); |
|
|
|
/* MQ supports lockless qdiscs. However, statistics accounting needs |
|
* to account for all, none, or a mix of locked and unlocked child |
|
* qdiscs. Percpu stats are added to counters in-band and locking |
|
* qdisc totals are added at end. |
|
*/ |
|
for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { |
|
qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping; |
|
spin_lock_bh(qdisc_lock(qdisc)); |
|
|
|
if (qdisc_is_percpu_stats(qdisc)) { |
|
qlen = qdisc_qlen_sum(qdisc); |
|
__gnet_stats_copy_basic(NULL, &sch->bstats, |
|
qdisc->cpu_bstats, |
|
&qdisc->bstats); |
|
__gnet_stats_copy_queue(&sch->qstats, |
|
qdisc->cpu_qstats, |
|
&qdisc->qstats, qlen); |
|
sch->q.qlen += qlen; |
|
} else { |
|
sch->q.qlen += qdisc->q.qlen; |
|
sch->bstats.bytes += qdisc->bstats.bytes; |
|
sch->bstats.packets += qdisc->bstats.packets; |
|
sch->qstats.qlen += qdisc->qstats.qlen; |
|
sch->qstats.backlog += qdisc->qstats.backlog; |
|
sch->qstats.drops += qdisc->qstats.drops; |
|
sch->qstats.requeues += qdisc->qstats.requeues; |
|
sch->qstats.overlimits += qdisc->qstats.overlimits; |
|
} |
|
|
|
spin_unlock_bh(qdisc_lock(qdisc)); |
|
} |
|
|
|
return mq_offload_stats(sch); |
|
} |
|
|
|
static struct netdev_queue *mq_queue_get(struct Qdisc *sch, unsigned long cl) |
|
{ |
|
struct net_device *dev = qdisc_dev(sch); |
|
unsigned long ntx = cl - 1; |
|
|
|
if (ntx >= dev->num_tx_queues) |
|
return NULL; |
|
return netdev_get_tx_queue(dev, ntx); |
|
} |
|
|
|
static struct netdev_queue *mq_select_queue(struct Qdisc *sch, |
|
struct tcmsg *tcm) |
|
{ |
|
return mq_queue_get(sch, TC_H_MIN(tcm->tcm_parent)); |
|
} |
|
|
|
static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new, |
|
struct Qdisc **old, struct netlink_ext_ack *extack) |
|
{ |
|
struct netdev_queue *dev_queue = mq_queue_get(sch, cl); |
|
struct tc_mq_qopt_offload graft_offload; |
|
struct net_device *dev = qdisc_dev(sch); |
|
|
|
if (dev->flags & IFF_UP) |
|
dev_deactivate(dev); |
|
|
|
*old = dev_graft_qdisc(dev_queue, new); |
|
if (new) |
|
new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; |
|
if (dev->flags & IFF_UP) |
|
dev_activate(dev); |
|
|
|
graft_offload.handle = sch->handle; |
|
graft_offload.graft_params.queue = cl - 1; |
|
graft_offload.graft_params.child_handle = new ? new->handle : 0; |
|
graft_offload.command = TC_MQ_GRAFT; |
|
|
|
qdisc_offload_graft_helper(qdisc_dev(sch), sch, new, *old, |
|
TC_SETUP_QDISC_MQ, &graft_offload, extack); |
|
return 0; |
|
} |
|
|
|
static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl) |
|
{ |
|
struct netdev_queue *dev_queue = mq_queue_get(sch, cl); |
|
|
|
return dev_queue->qdisc_sleeping; |
|
} |
|
|
|
static unsigned long mq_find(struct Qdisc *sch, u32 classid) |
|
{ |
|
unsigned int ntx = TC_H_MIN(classid); |
|
|
|
if (!mq_queue_get(sch, ntx)) |
|
return 0; |
|
return ntx; |
|
} |
|
|
|
static int mq_dump_class(struct Qdisc *sch, unsigned long cl, |
|
struct sk_buff *skb, struct tcmsg *tcm) |
|
{ |
|
struct netdev_queue *dev_queue = mq_queue_get(sch, cl); |
|
|
|
tcm->tcm_parent = TC_H_ROOT; |
|
tcm->tcm_handle |= TC_H_MIN(cl); |
|
tcm->tcm_info = dev_queue->qdisc_sleeping->handle; |
|
return 0; |
|
} |
|
|
|
static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl, |
|
struct gnet_dump *d) |
|
{ |
|
struct netdev_queue *dev_queue = mq_queue_get(sch, cl); |
|
|
|
sch = dev_queue->qdisc_sleeping; |
|
if (gnet_stats_copy_basic(&sch->running, d, sch->cpu_bstats, |
|
&sch->bstats) < 0 || |
|
qdisc_qstats_copy(d, sch) < 0) |
|
return -1; |
|
return 0; |
|
} |
|
|
|
static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg) |
|
{ |
|
struct net_device *dev = qdisc_dev(sch); |
|
unsigned int ntx; |
|
|
|
if (arg->stop) |
|
return; |
|
|
|
arg->count = arg->skip; |
|
for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) { |
|
if (arg->fn(sch, ntx + 1, arg) < 0) { |
|
arg->stop = 1; |
|
break; |
|
} |
|
arg->count++; |
|
} |
|
} |
|
|
|
static const struct Qdisc_class_ops mq_class_ops = { |
|
.select_queue = mq_select_queue, |
|
.graft = mq_graft, |
|
.leaf = mq_leaf, |
|
.find = mq_find, |
|
.walk = mq_walk, |
|
.dump = mq_dump_class, |
|
.dump_stats = mq_dump_class_stats, |
|
}; |
|
|
|
struct Qdisc_ops mq_qdisc_ops __read_mostly = { |
|
.cl_ops = &mq_class_ops, |
|
.id = "mq", |
|
.priv_size = sizeof(struct mq_sched), |
|
.init = mq_init, |
|
.destroy = mq_destroy, |
|
.attach = mq_attach, |
|
.dump = mq_dump, |
|
.owner = THIS_MODULE, |
|
};
|
|
|