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linux/net/sched/sch_mqprio.c
Jakub Kicinski 1e080f1775 net: sched: update default qdisc visibility after Tx queue cnt changes 
mq / mqprio make the default child qdiscs visible. They only do
so for the qdiscs which are within real_num_tx_queues when the
device is registered. Depending on order of calls in the driver,
or if user space changes config via ethtool -L the number of
qdiscs visible under tc qdisc show will differ from the number
of queues. This is confusing to users and potentially to system
configuration scripts which try to make sure qdiscs have the
right parameters.

Add a new Qdisc_ops callback and make relevant qdiscs TTRT.

Note that this uncovers the "shortcut" created by
commit 1f27cde313 ("net: sched: use pfifo_fast for non real queues")
The default child qdiscs beyond initial real_num_tx are always
pfifo_fast, no matter what the sysfs setting is. Fixing this
gets a little tricky because we'd need to keep a reference
on whatever the default qdisc was at the time of creation.
In practice this is likely an non-issue the qdiscs likely have
to be configured to non-default settings, so whatever user space
is doing such configuration can replace the pfifos... now that
it will see them.

Reported-by: Matthew Massey <matthewmassey@fb.com>
Reviewed-by: Dave Taht <dave.taht@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-09-15 15:46:02 +01:00

667 lines
17 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-only
/*
* net/sched/sch_mqprio.c
*
* Copyright (c) 2010 John Fastabend <john.r.fastabend@intel.com>
*/
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/module.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/sch_generic.h>
#include <net/pkt_cls.h>
struct mqprio_sched {
struct Qdisc **qdiscs;
u16 mode;
u16 shaper;
int hw_offload;
u32 flags;
u64 min_rate[TC_QOPT_MAX_QUEUE];
u64 max_rate[TC_QOPT_MAX_QUEUE];
};
static void mqprio_destroy(struct Qdisc *sch)
{
struct net_device *dev = qdisc_dev(sch);
struct mqprio_sched *priv = qdisc_priv(sch);
unsigned int ntx;
if (priv->qdiscs) {
for (ntx = 0;
ntx < dev->num_tx_queues && priv->qdiscs[ntx];
ntx++)
qdisc_put(priv->qdiscs[ntx]);
kfree(priv->qdiscs);
}
if (priv->hw_offload && dev->netdev_ops->ndo_setup_tc) {
struct tc_mqprio_qopt_offload mqprio = { { 0 } };
switch (priv->mode) {
case TC_MQPRIO_MODE_DCB:
case TC_MQPRIO_MODE_CHANNEL:
dev->netdev_ops->ndo_setup_tc(dev,
TC_SETUP_QDISC_MQPRIO,
&mqprio);
break;
default:
return;
}
} else {
netdev_set_num_tc(dev, 0);
}
}
static int mqprio_parse_opt(struct net_device *dev, struct tc_mqprio_qopt *qopt)
{
int i, j;
/* Verify num_tc is not out of max range */
if (qopt->num_tc > TC_MAX_QUEUE)
return -EINVAL;
/* Verify priority mapping uses valid tcs */
for (i = 0; i < TC_BITMASK + 1; i++) {
if (qopt->prio_tc_map[i] >= qopt->num_tc)
return -EINVAL;
}
/* Limit qopt->hw to maximum supported offload value. Drivers have
* the option of overriding this later if they don't support the a
* given offload type.
*/
if (qopt->hw > TC_MQPRIO_HW_OFFLOAD_MAX)
qopt->hw = TC_MQPRIO_HW_OFFLOAD_MAX;
/* If hardware offload is requested we will leave it to the device
* to either populate the queue counts itself or to validate the
* provided queue counts. If ndo_setup_tc is not present then
* hardware doesn't support offload and we should return an error.
*/
if (qopt->hw)
return dev->netdev_ops->ndo_setup_tc ? 0 : -EINVAL;
for (i = 0; i < qopt->num_tc; i++) {
unsigned int last = qopt->offset[i] + qopt->count[i];
/* Verify the queue count is in tx range being equal to the
* real_num_tx_queues indicates the last queue is in use.
*/
if (qopt->offset[i] >= dev->real_num_tx_queues ||
!qopt->count[i] ||
last > dev->real_num_tx_queues)
return -EINVAL;
/* Verify that the offset and counts do not overlap */
for (j = i + 1; j < qopt->num_tc; j++) {
if (last > qopt->offset[j])
return -EINVAL;
}
}
return 0;
}
static const struct nla_policy mqprio_policy[TCA_MQPRIO_MAX + 1] = {
[TCA_MQPRIO_MODE] = { .len = sizeof(u16) },
[TCA_MQPRIO_SHAPER] = { .len = sizeof(u16) },
[TCA_MQPRIO_MIN_RATE64] = { .type = NLA_NESTED },
[TCA_MQPRIO_MAX_RATE64] = { .type = NLA_NESTED },
};
static int parse_attr(struct nlattr *tb[], int maxtype, struct nlattr *nla,
const struct nla_policy *policy, int len)
{
int nested_len = nla_len(nla) - NLA_ALIGN(len);
if (nested_len >= nla_attr_size(0))
return nla_parse_deprecated(tb, maxtype,
nla_data(nla) + NLA_ALIGN(len),
nested_len, policy, NULL);
memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1));
return 0;
}
static int mqprio_init(struct Qdisc *sch, struct nlattr *opt,
struct netlink_ext_ack *extack)
{
struct net_device *dev = qdisc_dev(sch);
struct mqprio_sched *priv = qdisc_priv(sch);
struct netdev_queue *dev_queue;
struct Qdisc *qdisc;
int i, err = -EOPNOTSUPP;
struct tc_mqprio_qopt *qopt = NULL;
struct nlattr *tb[TCA_MQPRIO_MAX + 1];
struct nlattr *attr;
int rem;
int len;
BUILD_BUG_ON(TC_MAX_QUEUE != TC_QOPT_MAX_QUEUE);
BUILD_BUG_ON(TC_BITMASK != TC_QOPT_BITMASK);
if (sch->parent != TC_H_ROOT)
return -EOPNOTSUPP;
if (!netif_is_multiqueue(dev))
return -EOPNOTSUPP;
/* make certain can allocate enough classids to handle queues */
if (dev->num_tx_queues >= TC_H_MIN_PRIORITY)
return -ENOMEM;
if (!opt || nla_len(opt) < sizeof(*qopt))
return -EINVAL;
qopt = nla_data(opt);
if (mqprio_parse_opt(dev, qopt))
return -EINVAL;
len = nla_len(opt) - NLA_ALIGN(sizeof(*qopt));
if (len > 0) {
err = parse_attr(tb, TCA_MQPRIO_MAX, opt, mqprio_policy,
sizeof(*qopt));
if (err < 0)
return err;
if (!qopt->hw)
return -EINVAL;
if (tb[TCA_MQPRIO_MODE]) {
priv->flags |= TC_MQPRIO_F_MODE;
priv->mode = *(u16 *)nla_data(tb[TCA_MQPRIO_MODE]);
}
if (tb[TCA_MQPRIO_SHAPER]) {
priv->flags |= TC_MQPRIO_F_SHAPER;
priv->shaper = *(u16 *)nla_data(tb[TCA_MQPRIO_SHAPER]);
}
if (tb[TCA_MQPRIO_MIN_RATE64]) {
if (priv->shaper != TC_MQPRIO_SHAPER_BW_RATE)
return -EINVAL;
i = 0;
nla_for_each_nested(attr, tb[TCA_MQPRIO_MIN_RATE64],
rem) {
if (nla_type(attr) != TCA_MQPRIO_MIN_RATE64)
return -EINVAL;
if (i >= qopt->num_tc)
break;
priv->min_rate[i] = *(u64 *)nla_data(attr);
i++;
}
priv->flags |= TC_MQPRIO_F_MIN_RATE;
}
if (tb[TCA_MQPRIO_MAX_RATE64]) {
if (priv->shaper != TC_MQPRIO_SHAPER_BW_RATE)
return -EINVAL;
i = 0;
nla_for_each_nested(attr, tb[TCA_MQPRIO_MAX_RATE64],
rem) {
if (nla_type(attr) != TCA_MQPRIO_MAX_RATE64)
return -EINVAL;
if (i >= qopt->num_tc)
break;
priv->max_rate[i] = *(u64 *)nla_data(attr);
i++;
}
priv->flags |= TC_MQPRIO_F_MAX_RATE;
}
}
/* pre-allocate qdisc, attachment can't fail */
priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
GFP_KERNEL);
if (!priv->qdiscs)
return -ENOMEM;
for (i = 0; i < dev->num_tx_queues; i++) {
dev_queue = netdev_get_tx_queue(dev, i);
qdisc = qdisc_create_dflt(dev_queue,
get_default_qdisc_ops(dev, i),
TC_H_MAKE(TC_H_MAJ(sch->handle),
TC_H_MIN(i + 1)), extack);
if (!qdisc)
return -ENOMEM;
priv->qdiscs[i] = qdisc;
qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
}
/* If the mqprio options indicate that hardware should own
* the queue mapping then run ndo_setup_tc otherwise use the
* supplied and verified mapping
*/
if (qopt->hw) {
struct tc_mqprio_qopt_offload mqprio = {.qopt = *qopt};
switch (priv->mode) {
case TC_MQPRIO_MODE_DCB:
if (priv->shaper != TC_MQPRIO_SHAPER_DCB)
return -EINVAL;
break;
case TC_MQPRIO_MODE_CHANNEL:
mqprio.flags = priv->flags;
if (priv->flags & TC_MQPRIO_F_MODE)
mqprio.mode = priv->mode;
if (priv->flags & TC_MQPRIO_F_SHAPER)
mqprio.shaper = priv->shaper;
if (priv->flags & TC_MQPRIO_F_MIN_RATE)
for (i = 0; i < mqprio.qopt.num_tc; i++)
mqprio.min_rate[i] = priv->min_rate[i];
if (priv->flags & TC_MQPRIO_F_MAX_RATE)
for (i = 0; i < mqprio.qopt.num_tc; i++)
mqprio.max_rate[i] = priv->max_rate[i];
break;
default:
return -EINVAL;
}
err = dev->netdev_ops->ndo_setup_tc(dev,
TC_SETUP_QDISC_MQPRIO,
&mqprio);
if (err)
return err;
priv->hw_offload = mqprio.qopt.hw;
} else {
netdev_set_num_tc(dev, qopt->num_tc);
for (i = 0; i < qopt->num_tc; i++)
netdev_set_tc_queue(dev, i,
qopt->count[i], qopt->offset[i]);
}
/* Always use supplied priority mappings */
for (i = 0; i < TC_BITMASK + 1; i++)
netdev_set_prio_tc_map(dev, i, qopt->prio_tc_map[i]);
sch->flags |= TCQ_F_MQROOT;
return 0;
}
static void mqprio_attach(struct Qdisc *sch)
{
struct net_device *dev = qdisc_dev(sch);
struct mqprio_sched *priv = qdisc_priv(sch);
struct Qdisc *qdisc, *old;
unsigned int ntx;
/* Attach underlying qdisc */
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);
if (ntx < dev->real_num_tx_queues)
qdisc_hash_add(qdisc, false);
}
kfree(priv->qdiscs);
priv->qdiscs = NULL;
}
static void mqprio_change_real_num_tx(struct Qdisc *sch,
unsigned int new_real_tx)
{
struct net_device *dev = qdisc_dev(sch);
struct Qdisc *qdisc;
unsigned int i;
for (i = new_real_tx; i < dev->real_num_tx_queues; i++) {
qdisc = netdev_get_tx_queue(dev, i)->qdisc_sleeping;
/* Only update the default qdiscs we created,
* qdiscs with handles are always hashed.
*/
if (qdisc != &noop_qdisc && !qdisc->handle)
qdisc_hash_del(qdisc);
}
for (i = dev->real_num_tx_queues; i < new_real_tx; i++) {
qdisc = netdev_get_tx_queue(dev, i)->qdisc_sleeping;
if (qdisc != &noop_qdisc && !qdisc->handle)
qdisc_hash_add(qdisc, false);
}
}
static struct netdev_queue *mqprio_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 int mqprio_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
struct Qdisc **old, struct netlink_ext_ack *extack)
{
struct net_device *dev = qdisc_dev(sch);
struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
if (!dev_queue)
return -EINVAL;
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);
return 0;
}
static int dump_rates(struct mqprio_sched *priv,
struct tc_mqprio_qopt *opt, struct sk_buff *skb)
{
struct nlattr *nest;
int i;
if (priv->flags & TC_MQPRIO_F_MIN_RATE) {
nest = nla_nest_start_noflag(skb, TCA_MQPRIO_MIN_RATE64);
if (!nest)
goto nla_put_failure;
for (i = 0; i < opt->num_tc; i++) {
if (nla_put(skb, TCA_MQPRIO_MIN_RATE64,
sizeof(priv->min_rate[i]),
&priv->min_rate[i]))
goto nla_put_failure;
}
nla_nest_end(skb, nest);
}
if (priv->flags & TC_MQPRIO_F_MAX_RATE) {
nest = nla_nest_start_noflag(skb, TCA_MQPRIO_MAX_RATE64);
if (!nest)
goto nla_put_failure;
for (i = 0; i < opt->num_tc; i++) {
if (nla_put(skb, TCA_MQPRIO_MAX_RATE64,
sizeof(priv->max_rate[i]),
&priv->max_rate[i]))
goto nla_put_failure;
}
nla_nest_end(skb, nest);
}
return 0;
nla_put_failure:
nla_nest_cancel(skb, nest);
return -1;
}
static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
{
struct net_device *dev = qdisc_dev(sch);
struct mqprio_sched *priv = qdisc_priv(sch);
struct nlattr *nla = (struct nlattr *)skb_tail_pointer(skb);
struct tc_mqprio_qopt opt = { 0 };
struct Qdisc *qdisc;
unsigned int ntx, tc;
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)) {
__u32 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.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));
}
opt.num_tc = netdev_get_num_tc(dev);
memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map));
opt.hw = priv->hw_offload;
for (tc = 0; tc < netdev_get_num_tc(dev); tc++) {
opt.count[tc] = dev->tc_to_txq[tc].count;
opt.offset[tc] = dev->tc_to_txq[tc].offset;
}
if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
goto nla_put_failure;
if ((priv->flags & TC_MQPRIO_F_MODE) &&
nla_put_u16(skb, TCA_MQPRIO_MODE, priv->mode))
goto nla_put_failure;
if ((priv->flags & TC_MQPRIO_F_SHAPER) &&
nla_put_u16(skb, TCA_MQPRIO_SHAPER, priv->shaper))
goto nla_put_failure;
if ((priv->flags & TC_MQPRIO_F_MIN_RATE ||
priv->flags & TC_MQPRIO_F_MAX_RATE) &&
(dump_rates(priv, &opt, skb) != 0))
goto nla_put_failure;
return nla_nest_end(skb, nla);
nla_put_failure:
nlmsg_trim(skb, nla);
return -1;
}
static struct Qdisc *mqprio_leaf(struct Qdisc *sch, unsigned long cl)
{
struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
if (!dev_queue)
return NULL;
return dev_queue->qdisc_sleeping;
}
static unsigned long mqprio_find(struct Qdisc *sch, u32 classid)
{
struct net_device *dev = qdisc_dev(sch);
unsigned int ntx = TC_H_MIN(classid);
/* There are essentially two regions here that have valid classid
* values. The first region will have a classid value of 1 through
* num_tx_queues. All of these are backed by actual Qdiscs.
*/
if (ntx < TC_H_MIN_PRIORITY)
return (ntx <= dev->num_tx_queues) ? ntx : 0;
/* The second region represents the hardware traffic classes. These
* are represented by classid values of TC_H_MIN_PRIORITY through
* TC_H_MIN_PRIORITY + netdev_get_num_tc - 1
*/
return ((ntx - TC_H_MIN_PRIORITY) < netdev_get_num_tc(dev)) ? ntx : 0;
}
static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
struct sk_buff *skb, struct tcmsg *tcm)
{
if (cl < TC_H_MIN_PRIORITY) {
struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
struct net_device *dev = qdisc_dev(sch);
int tc = netdev_txq_to_tc(dev, cl - 1);
tcm->tcm_parent = (tc < 0) ? 0 :
TC_H_MAKE(TC_H_MAJ(sch->handle),
TC_H_MIN(tc + TC_H_MIN_PRIORITY));
tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
} else {
tcm->tcm_parent = TC_H_ROOT;
tcm->tcm_info = 0;
}
tcm->tcm_handle |= TC_H_MIN(cl);
return 0;
}
static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
struct gnet_dump *d)
__releases(d->lock)
__acquires(d->lock)
{
if (cl >= TC_H_MIN_PRIORITY) {
int i;
__u32 qlen = 0;
struct gnet_stats_queue qstats = {0};
struct gnet_stats_basic_packed bstats = {0};
struct net_device *dev = qdisc_dev(sch);
struct netdev_tc_txq tc = dev->tc_to_txq[cl & TC_BITMASK];
/* Drop lock here it will be reclaimed before touching
* statistics this is required because the d->lock we
* hold here is the look on dev_queue->qdisc_sleeping
* also acquired below.
*/
if (d->lock)
spin_unlock_bh(d->lock);
for (i = tc.offset; i < tc.offset + tc.count; i++) {
struct netdev_queue *q = netdev_get_tx_queue(dev, i);
struct Qdisc *qdisc = rtnl_dereference(q->qdisc);
struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL;
struct gnet_stats_queue __percpu *cpu_qstats = NULL;
spin_lock_bh(qdisc_lock(qdisc));
if (qdisc_is_percpu_stats(qdisc)) {
cpu_bstats = qdisc->cpu_bstats;
cpu_qstats = qdisc->cpu_qstats;
}
qlen = qdisc_qlen_sum(qdisc);
__gnet_stats_copy_basic(NULL, &sch->bstats,
cpu_bstats, &qdisc->bstats);
__gnet_stats_copy_queue(&sch->qstats,
cpu_qstats,
&qdisc->qstats,
qlen);
spin_unlock_bh(qdisc_lock(qdisc));
}
/* Reclaim root sleeping lock before completing stats */
if (d->lock)
spin_lock_bh(d->lock);
if (gnet_stats_copy_basic(NULL, d, NULL, &bstats) < 0 ||
gnet_stats_copy_queue(d, NULL, &qstats, qlen) < 0)
return -1;
} else {
struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
sch = dev_queue->qdisc_sleeping;
if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch), d,
sch->cpu_bstats, &sch->bstats) < 0 ||
qdisc_qstats_copy(d, sch) < 0)
return -1;
}
return 0;
}
static void mqprio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
{
struct net_device *dev = qdisc_dev(sch);
unsigned long ntx;
if (arg->stop)
return;
/* Walk hierarchy with a virtual class per tc */
arg->count = arg->skip;
for (ntx = arg->skip; ntx < netdev_get_num_tc(dev); ntx++) {
if (arg->fn(sch, ntx + TC_H_MIN_PRIORITY, arg) < 0) {
arg->stop = 1;
return;
}
arg->count++;
}
/* Pad the values and skip over unused traffic classes */
if (ntx < TC_MAX_QUEUE) {
arg->count = TC_MAX_QUEUE;
ntx = TC_MAX_QUEUE;
}
/* Reset offset, sort out remaining per-queue qdiscs */
for (ntx -= TC_MAX_QUEUE; ntx < dev->num_tx_queues; ntx++) {
if (arg->fn(sch, ntx + 1, arg) < 0) {
arg->stop = 1;
return;
}
arg->count++;
}
}
static struct netdev_queue *mqprio_select_queue(struct Qdisc *sch,
struct tcmsg *tcm)
{
return mqprio_queue_get(sch, TC_H_MIN(tcm->tcm_parent));
}
static const struct Qdisc_class_ops mqprio_class_ops = {
.graft = mqprio_graft,
.leaf = mqprio_leaf,
.find = mqprio_find,
.walk = mqprio_walk,
.dump = mqprio_dump_class,
.dump_stats = mqprio_dump_class_stats,
.select_queue = mqprio_select_queue,
};
static struct Qdisc_ops mqprio_qdisc_ops __read_mostly = {
.cl_ops = &mqprio_class_ops,
.id = "mqprio",
.priv_size = sizeof(struct mqprio_sched),
.init = mqprio_init,
.destroy = mqprio_destroy,
.attach = mqprio_attach,
.change_real_num_tx = mqprio_change_real_num_tx,
.dump = mqprio_dump,
.owner = THIS_MODULE,
};
static int __init mqprio_module_init(void)
{
return register_qdisc(&mqprio_qdisc_ops);
}
static void __exit mqprio_module_exit(void)
{
unregister_qdisc(&mqprio_qdisc_ops);
}
module_init(mqprio_module_init);
module_exit(mqprio_module_exit);
MODULE_LICENSE("GPL");
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