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xps: Add CONFIG_XPS

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This patch adds XPS_CONFIG option to enable and disable XPS.  This is
done in the same manner as RPS_CONFIG.  This is also fixes build
failure in XPS code when SMP is not enabled.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2010-11-26 08:36:09 +00:00 committed by David S. Miller
parent 8fa9208e30
commit bf26414510
5 changed files with 73 additions and 43 deletions
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52
include/linux/netdevice.h
View file

@ -535,30 +535,6 @@ struct rps_map {
};
#define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + (_num * sizeof(u16)))
/*
* This structure holds an XPS map which can be of variable length. The
* map is an array of queues.
*/
struct xps_map {
unsigned int len;
unsigned int alloc_len;
struct rcu_head rcu;
u16 queues[0];
};
#define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + (_num * sizeof(u16)))
#define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map)) \
/ sizeof(u16))
/*
* This structure holds all XPS maps for device. Maps are indexed by CPU.
*/
struct xps_dev_maps {
struct rcu_head rcu;
struct xps_map *cpu_map[0];
};
#define XPS_DEV_MAPS_SIZE (sizeof(struct xps_dev_maps) + \
(nr_cpu_ids * sizeof(struct xps_map *)))
/*
* The rps_dev_flow structure contains the mapping of a flow to a CPU and the
* tail pointer for that CPU's input queue at the time of last enqueue.
@ -626,6 +602,32 @@ struct netdev_rx_queue {
} ____cacheline_aligned_in_smp;
#endif /* CONFIG_RPS */
#ifdef CONFIG_XPS
/*
* This structure holds an XPS map which can be of variable length. The
* map is an array of queues.
*/
struct xps_map {
unsigned int len;
unsigned int alloc_len;
struct rcu_head rcu;
u16 queues[0];
};
#define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + (_num * sizeof(u16)))
#define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map)) \
/ sizeof(u16))
/*
* This structure holds all XPS maps for device. Maps are indexed by CPU.
*/
struct xps_dev_maps {
struct rcu_head rcu;
struct xps_map *cpu_map[0];
};
#define XPS_DEV_MAPS_SIZE (sizeof(struct xps_dev_maps) + \
(nr_cpu_ids * sizeof(struct xps_map *)))
#endif /* CONFIG_XPS */
/*
* This structure defines the management hooks for network devices.
* The following hooks can be defined; unless noted otherwise, they are
@ -1046,7 +1048,9 @@ struct net_device {
unsigned long tx_queue_len; /* Max frames per queue allowed */
spinlock_t tx_global_lock;
#ifdef CONFIG_XPS
struct xps_dev_maps *xps_maps;
#endif
/* These may be needed for future network-power-down code. */

5
net/Kconfig
View file

@ -220,6 +220,11 @@ config RPS
depends on SMP && SYSFS && USE_GENERIC_SMP_HELPERS
default y
config XPS
boolean
depends on SMP && SYSFS && USE_GENERIC_SMP_HELPERS
default y
menu "Network testing"
config NET_PKTGEN

9
net/core/dev.c
View file

@ -1567,6 +1567,9 @@ int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
txq);
if (rc)
return rc;
if (txq < dev->real_num_tx_queues)
qdisc_reset_all_tx_gt(dev, txq);
}
@ -2148,7 +2151,7 @@ static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
{
#ifdef CONFIG_RPS
#ifdef CONFIG_XPS
struct xps_dev_maps *dev_maps;
struct xps_map *map;
int queue_index = -1;
@ -5085,9 +5088,9 @@ void netif_stacked_transfer_operstate(const struct net_device *rootdev,
}
EXPORT_SYMBOL(netif_stacked_transfer_operstate);
#ifdef CONFIG_RPS
static int netif_alloc_rx_queues(struct net_device *dev)
{
#ifdef CONFIG_RPS
unsigned int i, count = dev->num_rx_queues;
struct netdev_rx_queue *rx;
@ -5102,9 +5105,9 @@ static int netif_alloc_rx_queues(struct net_device *dev)
for (i = 0; i < count; i++)
rx[i].dev = dev;
#endif
return 0;
}
#endif
static int netif_alloc_netdev_queues(struct net_device *dev)
{

47
net/core/net-sysfs.c
View file

@ -751,10 +751,12 @@ static int rx_queue_add_kobject(struct net_device *net, int index)
return error;
}
#endif /* CONFIG_RPS */
int
net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
{
#ifdef CONFIG_RPS
int i;
int error = 0;
@ -770,8 +772,12 @@ net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
kobject_put(&net->_rx[i].kobj);
return error;
#else
return 0;
#endif
}
#ifdef CONFIG_XPS
/*
* netdev_queue sysfs structures and functions.
*/
@ -1090,10 +1096,12 @@ static int netdev_queue_add_kobject(struct net_device *net, int index)
return error;
}
#endif /* CONFIG_XPS */
int
netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
{
#ifdef CONFIG_XPS
int i;
int error = 0;
@ -1109,27 +1117,36 @@ netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
kobject_put(&net->_tx[i].kobj);
return error;
#else
return 0;
#endif
}
static int register_queue_kobjects(struct net_device *net)
{
int error = 0, txq = 0, rxq = 0;
int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
#if defined(CONFIG_RPS) || defined(CONFIG_XPS)
net->queues_kset = kset_create_and_add("queues",
NULL, &net->dev.kobj);
if (!net->queues_kset)
return -ENOMEM;
#endif
error = net_rx_queue_update_kobjects(net, 0, net->real_num_rx_queues);
#ifdef CONFIG_RPS
real_rx = net->real_num_rx_queues;
#endif
real_tx = net->real_num_tx_queues;
error = net_rx_queue_update_kobjects(net, 0, real_rx);
if (error)
goto error;
rxq = net->real_num_rx_queues;
rxq = real_rx;
error = netdev_queue_update_kobjects(net, 0,
net->real_num_tx_queues);
error = netdev_queue_update_kobjects(net, 0, real_tx);
if (error)
goto error;
txq = net->real_num_tx_queues;
txq = real_tx;
return 0;
@ -1141,11 +1158,19 @@ static int register_queue_kobjects(struct net_device *net)
static void remove_queue_kobjects(struct net_device *net)
{
net_rx_queue_update_kobjects(net, net->real_num_rx_queues, 0);
netdev_queue_update_kobjects(net, net->real_num_tx_queues, 0);
int real_rx = 0, real_tx = 0;
#ifdef CONFIG_RPS
real_rx = net->real_num_rx_queues;
#endif
real_tx = net->real_num_tx_queues;
net_rx_queue_update_kobjects(net, real_rx, 0);
netdev_queue_update_kobjects(net, real_tx, 0);
#if defined(CONFIG_RPS) || defined(CONFIG_XPS)
kset_unregister(net->queues_kset);
#endif
}
#endif /* CONFIG_RPS */
static const void *net_current_ns(void)
{
@ -1244,9 +1269,7 @@ void netdev_unregister_kobject(struct net_device * net)
kobject_get(&dev->kobj);
#ifdef CONFIG_RPS
remove_queue_kobjects(net);
#endif
device_del(dev);
}
@ -1285,13 +1308,11 @@ int netdev_register_kobject(struct net_device *net)
if (error)
return error;
#ifdef CONFIG_RPS
error = register_queue_kobjects(net);
if (error) {
device_del(dev);
return error;
}
#endif
return error;
}

3
net/core/net-sysfs.h
View file

@ -4,11 +4,8 @@
int netdev_kobject_init(void);
int netdev_register_kobject(struct net_device *);
void netdev_unregister_kobject(struct net_device *);
#ifdef CONFIG_RPS
int net_rx_queue_update_kobjects(struct net_device *, int old_num, int new_num);
int netdev_queue_update_kobjects(struct net_device *net,
int old_num, int new_num);
#endif
#endif