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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
Download Patch File Download Diff File Expand all files Collapse all files

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) {