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net: Enable 64-bit net device statistics on 32-bit architectures

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Use struct rtnl_link_stats64 as the statistics structure.

On 32-bit architectures, insert 32 bits of padding after/before each
field of struct net_device_stats to make its layout compatible with
struct rtnl_link_stats64.  Add an anonymous union in net_device; move
stats into the union and add struct rtnl_link_stats64 stats64.

Add net_device_ops::ndo_get_stats64, implementations of which will
return a pointer to struct rtnl_link_stats64.  Drivers that implement
this operation must not update the structure asynchronously.

Change dev_get_stats() to call ndo_get_stats64 if available, and to
return a pointer to struct rtnl_link_stats64.  Change callers of
dev_get_stats() accordingly.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2010-06-08 07:19:54 +00:00 • committed by David S. Miller
parent d19b514999
commit be1f3c2c02
7 changed files with 90 additions and 67 deletions
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3
include/linux/if_link.h
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@ -4,7 +4,7 @@
#include <linux/types.h>
#include <linux/netlink.h>
/* The struct should be in sync with struct net_device_stats */
/* This struct should be in sync with struct rtnl_link_stats64 */
struct rtnl_link_stats {
__u32 rx_packets; /* total packets received */
__u32 tx_packets; /* total packets transmitted */
@ -37,6 +37,7 @@ struct rtnl_link_stats {
__u32 tx_compressed;
};
/* The main device statistics structure */
struct rtnl_link_stats64 {
__u64 rx_packets; /* total packets received */
__u64 tx_packets; /* total packets transmitted */