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net: Add sysfs value to determine queue traffic class

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Add a sysfs attribute for a Tx queue that allows us to determine the
traffic class for a given queue.  This will allow us to more easily
determine this in the future.  It is needed as XPS will take the traffic
class for a group of queues into account in order to avoid pulling traffic
from one traffic class into another.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck
2016-10-28 11:43:49 -04:00
committed by David S. Miller
parent 9cf1f6a8c4
commit 8d059b0f6f
3 changed files with 37 additions and 1 deletions
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20
net/core/net-sysfs.c
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@@ -1024,7 +1024,6 @@ static ssize_t show_trans_timeout(struct netdev_queue *queue,
return sprintf(buf, "%lu", trans_timeout);
}
#ifdef CONFIG_XPS
static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
{
struct net_device *dev = queue->dev;
@@ -1036,6 +1035,21 @@ static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
return i;
}
static ssize_t show_traffic_class(struct netdev_queue *queue,
struct netdev_queue_attribute *attribute,
char *buf)
{
struct net_device *dev = queue->dev;
int index = get_netdev_queue_index(queue);
int tc = netdev_txq_to_tc(dev, index);
if (tc < 0)
return -EINVAL;
return sprintf(buf, "%u\n", tc);
}
#ifdef CONFIG_XPS
static ssize_t show_tx_maxrate(struct netdev_queue *queue,
struct netdev_queue_attribute *attribute,
char *buf)
@@ -1078,6 +1092,9 @@ static struct netdev_queue_attribute queue_tx_maxrate =
static struct netdev_queue_attribute queue_trans_timeout =
__ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
static struct netdev_queue_attribute queue_traffic_class =
__ATTR(traffic_class, S_IRUGO, show_traffic_class, NULL);
#ifdef CONFIG_BQL
/*
* Byte queue limits sysfs structures and functions.
@@ -1263,6 +1280,7 @@ static struct netdev_queue_attribute xps_cpus_attribute =
static struct attribute *netdev_queue_default_attrs[] = {
&queue_trans_timeout.attr,
&queue_traffic_class.attr,
#ifdef CONFIG_XPS
&xps_cpus_attribute.attr,
&queue_tx_maxrate.attr,