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Date: Tue, 9 Nov 2010 12:47:38 -0800 (PST)
From: Tom Herbert <therbert@...gle.com>
To: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 2/2] net: Simplify RX queue allocation
This patch move RX queue allocation to alloc_netdev_mq and freeing of
the queues to free_netdev (symmetric to TX queue allocation). Each
kobject RX queue takes a reference to the queue's device so that the
device can't be freed before all the kobjects have been released-- this
obviates the need for reference counts specific to RX queues.
Signed-off-by: Tom Herbert <therbert@...gle.com>
---
include/linux/netdevice.h | 3 +--
net/core/dev.c | 15 ++++++++++-----
net/core/net-sysfs.c | 7 ++-----
3 files changed, 13 insertions(+), 12 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index d8fd2c2..da59595 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -592,8 +592,7 @@ struct netdev_rx_queue {
struct rps_map __rcu *rps_map;
struct rps_dev_flow_table __rcu *rps_flow_table;
struct kobject kobj;
- struct netdev_rx_queue *first;
- atomic_t count;
+ struct net_device *dev;
} ____cacheline_aligned_in_smp;
#endif /* CONFIG_RPS */
diff --git a/net/core/dev.c b/net/core/dev.c
index 8f9c76e..87d89ba 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5034,7 +5034,7 @@ static int netif_alloc_rx_queues(struct net_device *dev)
* reference count.
*/
for (i = 0; i < count; i++)
- rx[i].first = rx;
+ rx[i].dev = dev;
#endif
return 0;
}
@@ -5110,10 +5110,6 @@ int register_netdevice(struct net_device *dev)
dev->iflink = -1;
- ret = netif_alloc_rx_queues(dev);
- if (ret)
- goto out;
-
netdev_init_queues(dev);
/* Init, if this function is available */
@@ -5579,6 +5575,8 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
#ifdef CONFIG_RPS
dev->num_rx_queues = queue_count;
dev->real_num_rx_queues = queue_count;
+ if (netif_alloc_rx_queues(dev))
+ goto free_pcpu;
#endif
dev->gso_max_size = GSO_MAX_SIZE;
@@ -5596,6 +5594,10 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
free_pcpu:
free_percpu(dev->pcpu_refcnt);
kfree(dev->_tx);
+#ifdef CONFIG_RPS
+ kfree(dev->_rx);
+#endif
+
free_p:
kfree(p);
return NULL;
@@ -5617,6 +5619,9 @@ void free_netdev(struct net_device *dev)
release_net(dev_net(dev));
kfree(dev->_tx);
+#ifdef CONFIG_RPS
+ kfree(dev->_rx);
+#endif
kfree(rcu_dereference_raw(dev->ingress_queue));
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index a5ff5a8..3ba526b 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -706,7 +706,6 @@ static struct attribute *rx_queue_default_attrs[] = {
static void rx_queue_release(struct kobject *kobj)
{
struct netdev_rx_queue *queue = to_rx_queue(kobj);
- struct netdev_rx_queue *first = queue->first;
struct rps_map *map;
struct rps_dev_flow_table *flow_table;
@@ -719,8 +718,7 @@ static void rx_queue_release(struct kobject *kobj)
if (flow_table)
call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
- if (atomic_dec_and_test(&first->count))
- kfree(first);
+ dev_put(queue->dev);
}
static struct kobj_type rx_queue_ktype = {
@@ -732,7 +730,6 @@ static struct kobj_type rx_queue_ktype = {
static int rx_queue_add_kobject(struct net_device *net, int index)
{
struct netdev_rx_queue *queue = net->_rx + index;
- struct netdev_rx_queue *first = queue->first;
struct kobject *kobj = &queue->kobj;
int error = 0;
@@ -745,7 +742,7 @@ static int rx_queue_add_kobject(struct net_device *net, int index)
}
kobject_uevent(kobj, KOBJ_ADD);
- atomic_inc(&first->count);
+ dev_hold(queue->dev);
return error;
}
--
1.7.3.1
--
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