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authorAlexander Duyck <alexander.h.duyck@intel.com>2013-01-10 08:57:46 +0000
committerDavid S. Miller <davem@davemloft.net>2013-01-10 22:47:04 -0800
commit024e9679a2daaa67642693366fb63a6b8c61b9f3 (patch)
tree2661a1d8f50699e508f7bb0fbe83c90bbd2de3d2
parent01c5f864e62b1c1ee72fb492c6c5e47a162a507b (diff)
downloadop-kernel-dev-024e9679a2daaa67642693366fb63a6b8c61b9f3.zip
op-kernel-dev-024e9679a2daaa67642693366fb63a6b8c61b9f3.tar.gz
net: Add support for XPS without sysfs being defined
This patch makes it so that we can support transmit packet steering without sysfs needing to be enabled. The reason for making this change is to make it so that a driver can make use of the XPS even while the sysfs portion of the interface is not present. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/linux/netdevice.h1
-rw-r--r--net/Kconfig2
-rw-r--r--net/core/dev.c26
-rw-r--r--net/core/net-sysfs.c14
4 files changed, 21 insertions, 22 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 59fe9da..aa7ad8a 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2104,7 +2104,6 @@ static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
}
#ifdef CONFIG_XPS
-extern void netif_reset_xps_queue(struct net_device *dev, u16 index);
extern int netif_set_xps_queue(struct net_device *dev, struct cpumask *mask,
u16 index);
#else
diff --git a/net/Kconfig b/net/Kconfig
index 30b48f5..3cc5be0 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -232,7 +232,7 @@ config RFS_ACCEL
config XPS
boolean
- depends on SMP && SYSFS && USE_GENERIC_SMP_HELPERS
+ depends on SMP && USE_GENERIC_SMP_HELPERS
default y
config NETPRIO_CGROUP
diff --git a/net/core/dev.c b/net/core/dev.c
index 41d5120..95de4c0 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1887,10 +1887,10 @@ static struct xps_map *remove_xps_queue(struct xps_dev_maps *dev_maps,
return map;
}
-void netif_reset_xps_queue(struct net_device *dev, u16 index)
+static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index)
{
struct xps_dev_maps *dev_maps;
- int cpu;
+ int cpu, i;
bool active = false;
mutex_lock(&xps_map_mutex);
@@ -1900,7 +1900,11 @@ void netif_reset_xps_queue(struct net_device *dev, u16 index)
goto out_no_maps;
for_each_possible_cpu(cpu) {
- if (remove_xps_queue(dev_maps, cpu, index))
+ for (i = index; i < dev->num_tx_queues; i++) {
+ if (!remove_xps_queue(dev_maps, cpu, i))
+ break;
+ }
+ if (i == dev->num_tx_queues)
active = true;
}
@@ -1909,8 +1913,10 @@ void netif_reset_xps_queue(struct net_device *dev, u16 index)
kfree_rcu(dev_maps, rcu);
}
- netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index),
- NUMA_NO_NODE);
+ for (i = index; i < dev->num_tx_queues; i++)
+ netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i),
+ NUMA_NO_NODE);
+
out_no_maps:
mutex_unlock(&xps_map_mutex);
}
@@ -2096,8 +2102,12 @@ int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
if (dev->num_tc)
netif_setup_tc(dev, txq);
- if (txq < dev->real_num_tx_queues)
+ if (txq < dev->real_num_tx_queues) {
qdisc_reset_all_tx_gt(dev, txq);
+#ifdef CONFIG_XPS
+ netif_reset_xps_queues_gt(dev, txq);
+#endif
+ }
}
dev->real_num_tx_queues = txq;
@@ -5919,6 +5929,10 @@ static void rollback_registered_many(struct list_head *head)
/* Remove entries from kobject tree */
netdev_unregister_kobject(dev);
+#ifdef CONFIG_XPS
+ /* Remove XPS queueing entries */
+ netif_reset_xps_queues_gt(dev, 0);
+#endif
}
synchronize_net();
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 5ad489d..a5b89a6 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -1002,16 +1002,6 @@ static ssize_t show_xps_map(struct netdev_queue *queue,
return len;
}
-static void xps_queue_release(struct netdev_queue *queue)
-{
- struct net_device *dev = queue->dev;
- unsigned long index;
-
- index = get_netdev_queue_index(queue);
-
- netif_reset_xps_queue(dev, index);
-}
-
static ssize_t store_xps_map(struct netdev_queue *queue,
struct netdev_queue_attribute *attribute,
const char *buf, size_t len)
@@ -1058,10 +1048,6 @@ 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);
}
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