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| author |   Alexander Duyck <alexander.h.duyck@intel.com> | 2016-10-28 11:43:49 -0400 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-10-31 15:00:47 -0400 |
| commit | 8d059b0f6f5b1d3acf829454e1087818ad660058 (patch) | |
| tree | 8e6f21ec540692e9417cbc75a0da706a6b8669cc /net | |
| parent | net: Move functions for configuring traffic classes out of inline headers (diff) | |
| download | linux-dev-8d059b0f6f5b1d3acf829454e1087818ad660058.tar.xz linux-dev-8d059b0f6f5b1d3acf829454e1087818ad660058.zip | |
net: Add sysfs value to determine queue traffic class
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/dev.c | 17 | ||||
| -rw-r--r-- | net/core/net-sysfs.c | 20 |
2 files changed, 36 insertions, 1 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 2d54be912136..db0fdbbcd9b8 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1948,6 +1948,23 @@ static void netif_setup_tc(struct net_device *dev, unsigned int txq) } } +int netdev_txq_to_tc(struct net_device *dev, unsigned int txq) +{ + if (dev->num_tc) { + struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; + int i; + + for (i = 0; i < TC_MAX_QUEUE; i++, tc++) { + if ((txq - tc->offset) < tc->count) + return i; + } + + return -1; + } + + return 0; +} + #ifdef CONFIG_XPS static DEFINE_MUTEX(xps_map_mutex); #define xmap_dereference(P) \ diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index d4fe28606ff5..38bd9b933195 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -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, |