forked from mirrors/linux
bql: Byte queue limits
Networking stack support for byte queue limits, uses dynamic queue limits library. Byte queue limits are maintained per transmit queue, and a dql structure has been added to netdev_queue structure for this purpose. Configuration of bql is in the tx-<n> sysfs directory for the queue under the byte_queue_limits directory. Configuration includes: limit_min, bql minimum limit limit_max, bql maximum limit hold_time, bql slack hold time Also under the directory are: limit, current byte limit inflight, current number of bytes on the queue Signed-off-by: Tom Herbert <therbert@google.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert
David S. Miller
parent
927fbec13e
commit
114cf58021
4 changed files with 172 additions and 9 deletions
|
|
@ -43,6 +43,7 @@
|
|||
#include <linux/rculist.h>
|
||||
#include <linux/dmaengine.h>
|
||||
#include <linux/workqueue.h>
|
||||
#include <linux/dynamic_queue_limits.h>
|
||||
|
||||
#include <linux/ethtool.h>
|
||||
#include <net/net_namespace.h>
|
||||
|
|
@ -541,7 +542,6 @@ struct netdev_queue {
|
|||
*/
|
||||
struct net_device *dev;
|
||||
struct Qdisc *qdisc;
|
||||
unsigned long state;
|
||||
struct Qdisc *qdisc_sleeping;
|
||||
#ifdef CONFIG_SYSFS
|
||||
struct kobject kobj;
|
||||
|
|
@ -564,6 +564,12 @@ struct netdev_queue {
|
|||
* (/sys/class/net/DEV/Q/trans_timeout)
|
||||
*/
|
||||
unsigned long trans_timeout;
|
||||
|
||||
unsigned long state;
|
||||
|
||||
#ifdef CONFIG_BQL
|
||||
struct dql dql;
|
||||
#endif
|
||||
} ____cacheline_aligned_in_smp;
|
||||
|
||||
static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
|
||||
|
|
@ -1862,6 +1868,15 @@ static inline int netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_qu
|
|||
static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
|
||||
unsigned int bytes)
|
||||
{
|
||||
#ifdef CONFIG_BQL
|
||||
dql_queued(&dev_queue->dql, bytes);
|
||||
if (unlikely(dql_avail(&dev_queue->dql) < 0)) {
|
||||
set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
|
||||
if (unlikely(dql_avail(&dev_queue->dql) >= 0))
|
||||
clear_bit(__QUEUE_STATE_STACK_XOFF,
|
||||
&dev_queue->state);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes)
|
||||
|
|
@ -1872,6 +1887,18 @@ static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes)
|
|||
static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue,
|
||||
unsigned pkts, unsigned bytes)
|
||||
{
|
||||
#ifdef CONFIG_BQL
|
||||
if (likely(bytes)) {
|
||||
dql_completed(&dev_queue->dql, bytes);
|
||||
if (unlikely(test_bit(__QUEUE_STATE_STACK_XOFF,
|
||||
&dev_queue->state) &&
|
||||
dql_avail(&dev_queue->dql) >= 0)) {
|
||||
if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF,
|
||||
&dev_queue->state))
|
||||
netif_schedule_queue(dev_queue);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline void netdev_completed_queue(struct net_device *dev,
|
||||
|
|
@ -1882,6 +1909,9 @@ static inline void netdev_completed_queue(struct net_device *dev,
|
|||
|
||||
static inline void netdev_tx_reset_queue(struct netdev_queue *q)
|
||||
{
|
||||
#ifdef CONFIG_BQL
|
||||
dql_reset(&q->dql);
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline void netdev_reset_queue(struct net_device *dev_queue)
|
||||
|
|
|
|||
|
|
@ -239,6 +239,12 @@ config NETPRIO_CGROUP
|
|||
Cgroup subsystem for use in assigning processes to network priorities on
|
||||
a per-interface basis
|
||||
|
||||
config BQL
|
||||
boolean
|
||||
depends on SYSFS
|
||||
select DQL
|
||||
default y
|
||||
|
||||
config HAVE_BPF_JIT
|
||||
bool
|
||||
|
||||
|
|
|
|||
|
|
@ -5470,6 +5470,9 @@ static void netdev_init_one_queue(struct net_device *dev,
|
|||
queue->xmit_lock_owner = -1;
|
||||
netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
|
||||
queue->dev = dev;
|
||||
#ifdef CONFIG_BQL
|
||||
dql_init(&queue->dql, HZ);
|
||||
#endif
|
||||
}
|
||||
|
||||
static int netif_alloc_netdev_queues(struct net_device *dev)
|
||||
|
|
|
|||
|
|
@ -21,6 +21,7 @@
|
|||
#include <linux/wireless.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include <linux/export.h>
|
||||
#include <linux/jiffies.h>
|
||||
#include <net/wext.h>
|
||||
|
||||
#include "net-sysfs.h"
|
||||
|
|
@ -845,6 +846,116 @@ static ssize_t show_trans_timeout(struct netdev_queue *queue,
|
|||
static struct netdev_queue_attribute queue_trans_timeout =
|
||||
__ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
|
||||
|
||||
#ifdef CONFIG_BQL
|
||||
/*
|
||||
* Byte queue limits sysfs structures and functions.
|
||||
*/
|
||||
static ssize_t bql_show(char *buf, unsigned int value)
|
||||
{
|
||||
return sprintf(buf, "%u\n", value);
|
||||
}
|
||||
|
||||
static ssize_t bql_set(const char *buf, const size_t count,
|
||||
unsigned int *pvalue)
|
||||
{
|
||||
unsigned int value;
|
||||
int err;
|
||||
|
||||
if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
|
||||
value = DQL_MAX_LIMIT;
|
||||
else {
|
||||
err = kstrtouint(buf, 10, &value);
|
||||
if (err < 0)
|
||||
return err;
|
||||
if (value > DQL_MAX_LIMIT)
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
*pvalue = value;
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
static ssize_t bql_show_hold_time(struct netdev_queue *queue,
|
||||
struct netdev_queue_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
struct dql *dql = &queue->dql;
|
||||
|
||||
return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
|
||||
}
|
||||
|
||||
static ssize_t bql_set_hold_time(struct netdev_queue *queue,
|
||||
struct netdev_queue_attribute *attribute,
|
||||
const char *buf, size_t len)
|
||||
{
|
||||
struct dql *dql = &queue->dql;
|
||||
unsigned value;
|
||||
int err;
|
||||
|
||||
err = kstrtouint(buf, 10, &value);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
dql->slack_hold_time = msecs_to_jiffies(value);
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
static struct netdev_queue_attribute bql_hold_time_attribute =
|
||||
__ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
|
||||
bql_set_hold_time);
|
||||
|
||||
static ssize_t bql_show_inflight(struct netdev_queue *queue,
|
||||
struct netdev_queue_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
struct dql *dql = &queue->dql;
|
||||
|
||||
return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
|
||||
}
|
||||
|
||||
static struct netdev_queue_attribute bql_inflight_attribute =
|
||||
__ATTR(inflight, S_IRUGO | S_IWUSR, bql_show_inflight, NULL);
|
||||
|
||||
#define BQL_ATTR(NAME, FIELD) \
|
||||
static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
|
||||
struct netdev_queue_attribute *attr, \
|
||||
char *buf) \
|
||||
{ \
|
||||
return bql_show(buf, queue->dql.FIELD); \
|
||||
} \
|
||||
\
|
||||
static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
|
||||
struct netdev_queue_attribute *attr, \
|
||||
const char *buf, size_t len) \
|
||||
{ \
|
||||
return bql_set(buf, len, &queue->dql.FIELD); \
|
||||
} \
|
||||
\
|
||||
static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \
|
||||
__ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \
|
||||
bql_set_ ## NAME);
|
||||
|
||||
BQL_ATTR(limit, limit)
|
||||
BQL_ATTR(limit_max, max_limit)
|
||||
BQL_ATTR(limit_min, min_limit)
|
||||
|
||||
static struct attribute *dql_attrs[] = {
|
||||
&bql_limit_attribute.attr,
|
||||
&bql_limit_max_attribute.attr,
|
||||
&bql_limit_min_attribute.attr,
|
||||
&bql_hold_time_attribute.attr,
|
||||
&bql_inflight_attribute.attr,
|
||||
NULL
|
||||
};
|
||||
|
||||
static struct attribute_group dql_group = {
|
||||
.name = "byte_queue_limits",
|
||||
.attrs = dql_attrs,
|
||||
};
|
||||
#endif /* CONFIG_BQL */
|
||||
|
||||
#ifdef CONFIG_XPS
|
||||
static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
|
||||
{
|
||||
|
|
@ -1096,17 +1207,17 @@ static struct attribute *netdev_queue_default_attrs[] = {
|
|||
NULL
|
||||
};
|
||||
|
||||
#ifdef CONFIG_XPS
|
||||
static void netdev_queue_release(struct kobject *kobj)
|
||||
{
|
||||
struct netdev_queue *queue = to_netdev_queue(kobj);
|
||||
|
||||
#ifdef CONFIG_XPS
|
||||
xps_queue_release(queue);
|
||||
#endif
|
||||
|
||||
memset(kobj, 0, sizeof(*kobj));
|
||||
dev_put(queue->dev);
|
||||
}
|
||||
#endif /* CONFIG_XPS */
|
||||
|
||||
static struct kobj_type netdev_queue_ktype = {
|
||||
.sysfs_ops = &netdev_queue_sysfs_ops,
|
||||
|
|
@ -1125,14 +1236,21 @@ static int netdev_queue_add_kobject(struct net_device *net, int index)
|
|||
kobj->kset = net->queues_kset;
|
||||
error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
|
||||
"tx-%u", index);
|
||||
if (error) {
|
||||
kobject_put(kobj);
|
||||
return error;
|
||||
}
|
||||
if (error)
|
||||
goto exit;
|
||||
|
||||
#ifdef CONFIG_BQL
|
||||
error = sysfs_create_group(kobj, &dql_group);
|
||||
if (error)
|
||||
goto exit;
|
||||
#endif
|
||||
|
||||
kobject_uevent(kobj, KOBJ_ADD);
|
||||
dev_hold(queue->dev);
|
||||
|
||||
return 0;
|
||||
exit:
|
||||
kobject_put(kobj);
|
||||
return error;
|
||||
}
|
||||
#endif /* CONFIG_SYSFS */
|
||||
|
|
@ -1152,8 +1270,14 @@ netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
|
|||
}
|
||||
}
|
||||
|
||||
while (--i >= new_num)
|
||||
kobject_put(&net->_tx[i].kobj);
|
||||
while (--i >= new_num) {
|
||||
struct netdev_queue *queue = net->_tx + i;
|
||||
|
||||
#ifdef CONFIG_BQL
|
||||
sysfs_remove_group(&queue->kobj, &dql_group);
|
||||
#endif
|
||||
kobject_put(&queue->kobj);
|
||||
}
|
||||
|
||||
return error;
|
||||
#else
|
||||
|
|
|
|||
Loading…
Reference in a new issue