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netdev: The ingress_lock member is no longer needed. 

Every qdisc is assosciated with a queue, and in the case of ingress
qdiscs that will now be netdev->rx_queue so using that queue's lock is
the thing to do.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-07-08 17:33:13 -07:00
parent dc2b48475a
commit 555353cfa1
5 changed files with 17 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/ifb.c
View File

@ -229,13 +229,13 @@ module_param(numifbs, int, 0);
MODULE_PARM_DESC(numifbs, "Number of ifb devices");
/*
* dev_ifb->tx_queue.lock is usually taken after dev->ingress_lock,
* dev_ifb->tx_queue.lock is usually taken after dev->rx_queue.lock,
* reversely to e.g. qdisc_lock_tree(). It should be safe until
* ifb doesn't take dev->tx_queue.lock with dev_ifb->ingress_lock.
* ifb doesn't take dev->tx_queue.lock with dev_ifb->rx_queue.lock.
* But lockdep should know that ifb has different locks from dev.
*/
static struct lock_class_key ifb_tx_queue_lock_key;
static struct lock_class_key ifb_ingress_lock_key;
static struct lock_class_key ifb_rx_queue_lock_key;
static int __init ifb_init_one(int index)
@ -259,7 +259,7 @@ static int __init ifb_init_one(int index)
goto err;
lockdep_set_class(&dev_ifb->tx_queue.lock, &ifb_tx_queue_lock_key);
lockdep_set_class(&dev_ifb->ingress_lock, &ifb_ingress_lock_key);
lockdep_set_class(&dev_ifb->rx_queue.lock, &ifb_rx_queue_lock_key);
return 0;

2
include/linux/netdevice.h
View File

@ -632,8 +632,6 @@ struct net_device
struct netdev_queue rx_queue;
struct netdev_queue tx_queue ____cacheline_aligned_in_smp;
/* ingress path synchronizer */
spinlock_t ingress_lock;
struct Qdisc *qdisc_ingress;
/*

12
net/core/dev.c
View File

@ -2014,10 +2014,11 @@ static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
*/
static int ing_filter(struct sk_buff *skb)
{
struct Qdisc *q;
struct net_device *dev = skb->dev;
int result = TC_ACT_OK;
u32 ttl = G_TC_RTTL(skb->tc_verd);
struct netdev_queue *rxq;
int result = TC_ACT_OK;
struct Qdisc *q;
if (MAX_RED_LOOP < ttl++) {
printk(KERN_WARNING
@ -2029,10 +2030,12 @@ static int ing_filter(struct sk_buff *skb)
skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
spin_lock(&dev->ingress_lock);
rxq = &dev->rx_queue;
spin_lock(&rxq->lock);
if ((q = dev->qdisc_ingress) != NULL)
result = q->enqueue(skb, q);
spin_unlock(&dev->ingress_lock);
spin_unlock(&rxq->lock);
return result;
}
@ -3795,7 +3798,6 @@ int register_netdevice(struct net_device *dev)
spin_lock_init(&dev->_xmit_lock);
netdev_set_lockdep_class(&dev->_xmit_lock, dev->type);
dev->xmit_lock_owner = -1;
spin_lock_init(&dev->ingress_lock);
dev->iflink = -1;

3
net/sched/sch_api.c
View File

@ -601,12 +601,11 @@ qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
sch->parent = parent;
sch->stats_lock = &dev_queue->lock;
if (handle == TC_H_INGRESS) {
sch->flags |= TCQ_F_INGRESS;
sch->stats_lock = &dev->ingress_lock;
handle = TC_H_MAKE(TC_H_INGRESS, 0);
} else {
sch->stats_lock = &dev_queue->lock;
if (handle == 0) {
handle = qdisc_alloc_handle(dev);
err = -ENOMEM;

10
net/sched/sch_generic.c
View File

@ -35,24 +35,24 @@
* - enqueue, dequeue are serialized via top level device
* spinlock queue->lock.
* - ingress filtering is serialized via top level device
* spinlock dev->ingress_lock.
* spinlock dev->rx_queue.lock.
* - updates to tree and tree walking are only done under the rtnl mutex.
*/
void qdisc_lock_tree(struct net_device *dev)
__acquires(dev->tx_queue.lock)
__acquires(dev->ingress_lock)
__acquires(dev->rx_queue.lock)
{
spin_lock_bh(&dev->tx_queue.lock);
spin_lock(&dev->ingress_lock);
spin_lock(&dev->rx_queue.lock);
}
EXPORT_SYMBOL(qdisc_lock_tree);
void qdisc_unlock_tree(struct net_device *dev)
__releases(dev->ingress_lock)
__releases(dev->rx_queue.lock)
__releases(dev->tx_queue.lock)
{
spin_unlock(&dev->ingress_lock);
spin_unlock(&dev->rx_queue.lock);
spin_unlock_bh(&dev->tx_queue.lock);
}
EXPORT_SYMBOL(qdisc_unlock_tree);