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netdev: introduce dev_get_stats()

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In order for the network device ops get_stats call to be immutable, the handling
of the default internal network device stats block has to be changed. Add a new
helper function which replaces the old use of internal_get_stats.

Note: change return code to make it clear that the caller should not
go changing the returned statistics.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2008-11-19 21:40:23 -08:00 committed by David S. Miller
parent d314774cf2
commit eeda3fd64f
8 changed files with 33 additions and 18 deletions
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4
arch/s390/appldata/appldata_net_sum.c
View File

@ -67,7 +67,6 @@ static void appldata_get_net_sum_data(void *data)
int i;
struct appldata_net_sum_data *net_data;
struct net_device *dev;
struct net_device_stats *stats;
unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors,
tx_errors, rx_dropped, tx_dropped, collisions;
@ -86,7 +85,8 @@ static void appldata_get_net_sum_data(void *data)
collisions = 0;
read_lock(&dev_base_lock);
for_each_netdev(&init_net, dev) {
stats = dev->get_stats(dev);
const struct net_device_stats *stats = dev_get_stats(dev);
rx_packets += stats->rx_packets;
tx_packets += stats->tx_packets;
rx_bytes += stats->rx_bytes;

5
drivers/net/bonding/bond_main.c
View File

@ -3899,7 +3899,7 @@ static int bond_close(struct net_device *bond_dev)
static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
struct net_device_stats *stats = &(bond->stats), *sstats;
struct net_device_stats *stats = &bond->stats;
struct net_device_stats local_stats;
struct slave *slave;
int i;
@ -3909,7 +3909,8 @@ static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
read_lock_bh(&bond->lock);
bond_for_each_slave(bond, slave, i) {
sstats = slave->dev->get_stats(slave->dev);
const struct net_device_stats *sstats = dev_get_stats(slave->dev);
local_stats.rx_packets += sstats->rx_packets;
local_stats.rx_bytes += sstats->rx_bytes;
local_stats.rx_errors += sstats->rx_errors;

2
drivers/net/sfc/ethtool.c
View File

@ -426,7 +426,7 @@ static void efx_ethtool_get_stats(struct net_device *net_dev,
EFX_BUG_ON_PARANOID(stats->n_stats != EFX_ETHTOOL_NUM_STATS);
/* Update MAC and NIC statistics */
net_dev->get_stats(net_dev);
dev_get_stats(net_dev);
/* Fill detailed statistics buffer */
for (i = 0; i < EFX_ETHTOOL_NUM_STATS; i++) {

4
drivers/parisc/led.c
View File

@ -360,13 +360,13 @@ static __inline__ int led_get_net_activity(void)
read_lock(&dev_base_lock);
rcu_read_lock();
for_each_netdev(&init_net, dev) {
struct net_device_stats *stats;
const struct net_device_stats *stats;
struct in_device *in_dev = __in_dev_get_rcu(dev);
if (!in_dev || !in_dev->ifa_list)
continue;
if (ipv4_is_loopback(in_dev->ifa_list->ifa_local))
continue;
stats = dev->get_stats(dev);
stats = dev_get_stats(dev);
rx_total += stats->rx_packets;
tx_total += stats->tx_packets;
}

4
include/linux/netdevice.h
View File

@ -864,9 +864,9 @@ struct net_device
unsigned short vid);
#ifdef CONFIG_NET_POLL_CONTROLLER
void (*poll_controller)(struct net_device *dev);
#endif
#endif
};
#endif
};
#define to_net_dev(d) container_of(d, struct net_device, dev)
@ -1780,6 +1780,8 @@ extern void netdev_features_change(struct net_device *dev);
/* Load a device via the kmod */
extern void dev_load(struct net *net, const char *name);
extern void dev_mcast_init(void);
extern const struct net_device_stats *dev_get_stats(struct net_device *dev);
extern int netdev_max_backlog;
extern int weight_p;
extern int netdev_set_master(struct net_device *dev, struct net_device *master);

23
net/core/dev.c
View File

@ -2620,7 +2620,7 @@ void dev_seq_stop(struct seq_file *seq, void *v)
static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
struct net_device_stats *stats = dev->get_stats(dev);
const struct net_device_stats *stats = dev_get_stats(dev);
seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
"%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
@ -4288,10 +4288,24 @@ void netdev_run_todo(void)
}
}
static struct net_device_stats *internal_stats(struct net_device *dev)
{
return &dev->stats;
/**
* dev_get_stats - get network device statistics
* @dev: device to get statistics from
*
* Get network statistics from device. The device driver may provide
* its own method by setting dev->netdev_ops->get_stats; otherwise
* the internal statistics structure is used.
*/
const struct net_device_stats *dev_get_stats(struct net_device *dev)
{
const struct net_device_ops *ops = dev->netdev_ops;
if (ops->ndo_get_stats)
return ops->ndo_get_stats(dev);
else
return &dev->stats;
}
EXPORT_SYMBOL(dev_get_stats);
static void netdev_init_one_queue(struct net_device *dev,
struct netdev_queue *queue,
@ -4370,7 +4384,6 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
netdev_init_queues(dev);
dev->get_stats = internal_stats;
netpoll_netdev_init(dev);
setup(dev);
strcpy(dev->name, name);

3
net/core/net-sysfs.c
View File

@ -270,7 +270,6 @@ static ssize_t netstat_show(const struct device *d,
unsigned long offset)
{
struct net_device *dev = to_net_dev(d);
struct net_device_stats *stats;
ssize_t ret = -EINVAL;
WARN_ON(offset > sizeof(struct net_device_stats) ||
@ -278,7 +277,7 @@ static ssize_t netstat_show(const struct device *d,
read_lock(&dev_base_lock);
if (dev_isalive(dev)) {
stats = dev->get_stats(dev);
const struct net_device_stats *stats = dev_get_stats(dev);
ret = sprintf(buf, fmt_ulong,
*(unsigned long *)(((u8 *) stats) + offset));
}

6
net/core/rtnetlink.c
View File

@ -551,7 +551,7 @@ static void set_operstate(struct net_device *dev, unsigned char transition)
}
static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
struct net_device_stats *b)
const struct net_device_stats *b)
{
a->rx_packets = b->rx_packets;
a->tx_packets = b->tx_packets;
@ -609,7 +609,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
struct netdev_queue *txq;
struct ifinfomsg *ifm;
struct nlmsghdr *nlh;
struct net_device_stats *stats;
const struct net_device_stats *stats;
struct nlattr *attr;
nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
@ -666,7 +666,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
if (attr == NULL)
goto nla_put_failure;
stats = dev->get_stats(dev);
stats = dev_get_stats(dev);
copy_rtnl_link_stats(nla_data(attr), stats);
if (dev->rtnl_link_ops) {