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net: Get rid of rtnl_link_stats64 / net_device_stats union

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In commit be1f3c2c02 "net: Enable 64-bit
net device statistics on 32-bit architectures" I redefined struct
net_device_stats so that it could be used in a union with struct
rtnl_link_stats64, avoiding the need for explicit copying or
conversion between the two.  However, this is unsafe because there is
no locking required and no lock consistently held around calls to
dev_get_stats() and use of the statistics structure it returns.

In commit 28172739f0 "net: fix 64 bit
counters on 32 bit arches" Eric Dumazet dealt with that problem by
requiring callers of dev_get_stats() to provide storage for the
result.  This means that the net_device::stats64 field and the padding
in struct net_device_stats are now redundant, so remove them.

Update the comment on net_device_ops::ndo_get_stats64 to reflect its
new usage.

Change dev_txq_stats_fold() to use struct rtnl_link_stats64, since
that is what all its callers are really using and it is no longer
going to be compatible with struct net_device_stats.

Eric Dumazet suggested the separate function for the structure
conversion.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2010-07-09 09:11:52 +00:00 • committed by David S. Miller
parent cc7b86c1a8
commit 3cfde79c6c
4 changed files with 56 additions and 49 deletions
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70
include/linux/netdevice.h
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@ -162,42 +162,32 @@ static inline bool dev_xmit_complete(int rc)
/*
* Old network device statistics. Fields are native words
* (unsigned long) so they can be read and written atomically.
* Each field is padded to 64 bits for compatibility with
* rtnl_link_stats64.
*/
#if BITS_PER_LONG == 64
#define NET_DEVICE_STATS_DEFINE(name) unsigned long name
#elif defined(__LITTLE_ENDIAN)
#define NET_DEVICE_STATS_DEFINE(name) unsigned long name, pad_ ## name
#else
#define NET_DEVICE_STATS_DEFINE(name) unsigned long pad_ ## name, name
#endif
struct net_device_stats {
NET_DEVICE_STATS_DEFINE(rx_packets);
NET_DEVICE_STATS_DEFINE(tx_packets);
NET_DEVICE_STATS_DEFINE(rx_bytes);
NET_DEVICE_STATS_DEFINE(tx_bytes);
NET_DEVICE_STATS_DEFINE(rx_errors);
NET_DEVICE_STATS_DEFINE(tx_errors);
NET_DEVICE_STATS_DEFINE(rx_dropped);
NET_DEVICE_STATS_DEFINE(tx_dropped);
NET_DEVICE_STATS_DEFINE(multicast);
NET_DEVICE_STATS_DEFINE(collisions);
NET_DEVICE_STATS_DEFINE(rx_length_errors);
NET_DEVICE_STATS_DEFINE(rx_over_errors);
NET_DEVICE_STATS_DEFINE(rx_crc_errors);
NET_DEVICE_STATS_DEFINE(rx_frame_errors);
NET_DEVICE_STATS_DEFINE(rx_fifo_errors);
NET_DEVICE_STATS_DEFINE(rx_missed_errors);
NET_DEVICE_STATS_DEFINE(tx_aborted_errors);
NET_DEVICE_STATS_DEFINE(tx_carrier_errors);
NET_DEVICE_STATS_DEFINE(tx_fifo_errors);
NET_DEVICE_STATS_DEFINE(tx_heartbeat_errors);
NET_DEVICE_STATS_DEFINE(tx_window_errors);
NET_DEVICE_STATS_DEFINE(rx_compressed);
NET_DEVICE_STATS_DEFINE(tx_compressed);
unsigned long rx_packets;
unsigned long tx_packets;
unsigned long rx_bytes;
unsigned long tx_bytes;
unsigned long rx_errors;
unsigned long tx_errors;
unsigned long rx_dropped;
unsigned long tx_dropped;
unsigned long multicast;
unsigned long collisions;
unsigned long rx_length_errors;
unsigned long rx_over_errors;
unsigned long rx_crc_errors;
unsigned long rx_frame_errors;
unsigned long rx_fifo_errors;
unsigned long rx_missed_errors;
unsigned long tx_aborted_errors;
unsigned long tx_carrier_errors;
unsigned long tx_fifo_errors;
unsigned long tx_heartbeat_errors;
unsigned long tx_window_errors;
unsigned long rx_compressed;
unsigned long tx_compressed;
};
#endif /* __KERNEL__ */
@ -666,14 +656,13 @@ struct netdev_rx_queue {
* Callback uses when the transmitter has not made any progress
* for dev->watchdog ticks.
*
* struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev
* struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
* struct rtnl_link_stats64 *storage);
* struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
* Called when a user wants to get the network device usage
* statistics. Drivers must do one of the following:
* 1. Define @ndo_get_stats64 to update a rtnl_link_stats64 structure
* (which should normally be dev->stats64) and return a ponter to
* it. The structure must not be changed asynchronously.
* 1. Define @ndo_get_stats64 to fill in a zero-initialised
* rtnl_link_stats64 structure passed by the caller.
* 2. Define @ndo_get_stats to update a net_device_stats structure
* (which should normally be dev->stats) and return a pointer to
* it. The structure may be changed asynchronously only if each
@ -888,10 +877,7 @@ struct net_device {
int ifindex;
int iflink;
union {
struct rtnl_link_stats64 stats64;
struct net_device_stats stats;
};
struct net_device_stats stats;
#ifdef CONFIG_WIRELESS_EXT
/* List of functions to handle Wireless Extensions (instead of ioctl).
@ -2147,7 +2133,7 @@ extern void dev_mcast_init(void);
extern const struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
struct rtnl_link_stats64 *storage);
extern void dev_txq_stats_fold(const struct net_device *dev,
struct net_device_stats *stats);
struct rtnl_link_stats64 *stats);
extern int netdev_max_backlog;
extern int netdev_tstamp_prequeue;