[ovs-dev] [gmane.linux.network] [PATCHv3 1/2] net: Enable 64-bit net device statistics on 32-bit architectures
Ben Pfaff
blp at nicira.com
Sun Jun 13 23:08:46 UTC 2010
Upstream Linux is moving toward enabling 64-bit device statistics
even on 32-bit architectures. Here's the first patch, which
David Miller has already applied to next-next (which will be
merged into the next upstream Linux).
-------------------- Start of forwarded message --------------------
Path: news.gmane.org!not-for-mail
From: Ben Hutchings <bhutchings at solarflare.com>
Newsgroups: gmane.linux.network
Subject: [PATCHv3 1/2] net: Enable 64-bit net device statistics on 32-bit
architectures
Message-ID: <1276017594.2185.11.camel at achroite.uk.solarflarecom.com>
Cc: Stephen Hemminger <shemminger at vyatta.com>,
Arnd Bergmann <arnd at arndb.de>, netdev at vger.kernel.org,
linux-net-drivers at solarflare.com
To: David Miller <davem at davemloft.net>
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 at solarflare.com>
---
Changes from v2:
- Keep type of net_device_stats fields as unsigned long rather than
making it explicitly u32 or u64
- Update bonding driver, which calls dev_get_stats() and must now
implement net_device_ops::ndo_get_stats64
Changes from v1:
- Remove accessor macros
Compile-tested allmodconfig on i386; this version should introduce no
new warnings.
Tested that 64-bit statistics work on i386 with bonding and sfc drivers
(using the following patch).
Ben.
drivers/net/bonding/bond_main.c | 13 +++---
include/linux/if_link.h | 3 +-
include/linux/netdevice.h | 91 +++++++++++++++++++++++----------------
net/8021q/vlanproc.c | 13 +++---
net/core/dev.c | 19 +++++---
net/core/net-sysfs.c | 12 +++---
net/core/rtnetlink.c | 6 +-
7 files changed, 90 insertions(+), 67 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 5e12462..275f555 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3774,20 +3774,21 @@ static int bond_close(struct net_device *bond_dev)
return 0;
}
-static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
+static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
- struct net_device_stats *stats = &bond_dev->stats;
- struct net_device_stats local_stats;
+ struct rtnl_link_stats64 *stats = &bond_dev->stats64;
+ struct rtnl_link_stats64 local_stats;
struct slave *slave;
int i;
- memset(&local_stats, 0, sizeof(struct net_device_stats));
+ memset(&local_stats, 0, sizeof(local_stats));
read_lock_bh(&bond->lock);
bond_for_each_slave(bond, slave, i) {
- const struct net_device_stats *sstats = dev_get_stats(slave->dev);
+ const struct rtnl_link_stats64 *sstats =
+ dev_get_stats(slave->dev);
local_stats.rx_packets += sstats->rx_packets;
local_stats.rx_bytes += sstats->rx_bytes;
@@ -4488,7 +4489,7 @@ static const struct net_device_ops bond_netdev_ops = {
.ndo_open = bond_open,
.ndo_stop = bond_close,
.ndo_start_xmit = bond_start_xmit,
- .ndo_get_stats = bond_get_stats,
+ .ndo_get_stats64 = bond_get_stats,
.ndo_do_ioctl = bond_do_ioctl,
.ndo_set_multicast_list = bond_set_multicast_list,
.ndo_change_mtu = bond_change_mtu,
diff --git a/include/linux/if_link.h b/include/linux/if_link.h
index 85c812d..7fcad2e 100644
--- a/include/linux/if_link.h
+++ b/include/linux/if_link.h
@@ -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 */
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index a249161..d85a38e 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -159,45 +159,49 @@ static inline bool dev_xmit_complete(int rc)
#define MAX_HEADER (LL_MAX_HEADER + 48)
#endif
-#endif /* __KERNEL__ */
-
/*
- * Network device statistics. Akin to the 2.0 ether stats but
- * with byte counters.
+ * 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 {
- unsigned long rx_packets; /* total packets received */
- unsigned long tx_packets; /* total packets transmitted */
- unsigned long rx_bytes; /* total bytes received */
- unsigned long tx_bytes; /* total bytes transmitted */
- unsigned long rx_errors; /* bad packets received */
- unsigned long tx_errors; /* packet transmit problems */
- unsigned long rx_dropped; /* no space in linux buffers */
- unsigned long tx_dropped; /* no space available in linux */
- unsigned long multicast; /* multicast packets received */
- unsigned long collisions;
-
- /* detailed rx_errors: */
- unsigned long rx_length_errors;
- unsigned long rx_over_errors; /* receiver ring buff overflow */
- unsigned long rx_crc_errors; /* recved pkt with crc error */
- unsigned long rx_frame_errors; /* recv'd frame alignment error */
- unsigned long rx_fifo_errors; /* recv'r fifo overrun */
- unsigned long rx_missed_errors; /* receiver missed packet */
-
- /* detailed tx_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;
-
- /* for cslip etc */
- unsigned long rx_compressed;
- unsigned long tx_compressed;
+ 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);
};
+#endif /* __KERNEL__ */
+
/* Media selection options. */
enum {
@@ -660,10 +664,19 @@ 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 net_device_stats* (*ndo_get_stats)(struct net_device *dev);
* Called when a user wants to get the network device usage
- * statistics. If not defined, the counters in dev->stats will
- * be used.
+ * 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.
+ * 2. Define @ndo_get_stats to update a net_device_stats64 structure
+ * (which should normally be dev->stats) and return a pointer to
+ * it. The structure may be changed asynchronously only if each
+ * field is written atomically.
+ * 3. Update dev->stats asynchronously and atomically, and define
+ * neither operation.
*
* void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp);
* If device support VLAN receive accleration
@@ -718,6 +731,7 @@ struct net_device_ops {
struct neigh_parms *);
void (*ndo_tx_timeout) (struct net_device *dev);
+ struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev);
struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
void (*ndo_vlan_rx_register)(struct net_device *dev,
@@ -867,7 +881,10 @@ struct net_device {
int ifindex;
int iflink;
- struct net_device_stats stats;
+ union {
+ struct rtnl_link_stats64 stats64;
+ struct net_device_stats stats;
+ };
#ifdef CONFIG_WIRELESS_EXT
/* List of functions to handle Wireless Extensions (instead of ioctl).
@@ -2118,7 +2135,7 @@ 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 const struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev);
extern void dev_txq_stats_fold(const struct net_device *dev, struct net_device_stats *stats);
extern int netdev_max_backlog;
diff --git a/net/8021q/vlanproc.c b/net/8021q/vlanproc.c
index afead35..df56f5c 100644
--- a/net/8021q/vlanproc.c
+++ b/net/8021q/vlanproc.c
@@ -278,8 +278,9 @@ static int vlandev_seq_show(struct seq_file *seq, void *offset)
{
struct net_device *vlandev = (struct net_device *) seq->private;
const struct vlan_dev_info *dev_info = vlan_dev_info(vlandev);
- const struct net_device_stats *stats;
+ const struct rtnl_link_stats64 *stats;
static const char fmt[] = "%30s %12lu\n";
+ static const char fmt64[] = "%30s %12llu\n";
int i;
if (!is_vlan_dev(vlandev))
@@ -291,12 +292,12 @@ static int vlandev_seq_show(struct seq_file *seq, void *offset)
vlandev->name, dev_info->vlan_id,
(int)(dev_info->flags & 1), vlandev->priv_flags);
- seq_printf(seq, fmt, "total frames received", stats->rx_packets);
- seq_printf(seq, fmt, "total bytes received", stats->rx_bytes);
- seq_printf(seq, fmt, "Broadcast/Multicast Rcvd", stats->multicast);
+ seq_printf(seq, fmt64, "total frames received", stats->rx_packets);
+ seq_printf(seq, fmt64, "total bytes received", stats->rx_bytes);
+ seq_printf(seq, fmt64, "Broadcast/Multicast Rcvd", stats->multicast);
seq_puts(seq, "\n");
- seq_printf(seq, fmt, "total frames transmitted", stats->tx_packets);
- seq_printf(seq, fmt, "total bytes transmitted", stats->tx_bytes);
+ seq_printf(seq, fmt64, "total frames transmitted", stats->tx_packets);
+ seq_printf(seq, fmt64, "total bytes transmitted", stats->tx_bytes);
seq_printf(seq, fmt, "total headroom inc",
dev_info->cnt_inc_headroom_on_tx);
seq_printf(seq, fmt, "total encap on xmit",
diff --git a/net/core/dev.c b/net/core/dev.c
index 983a3c1..71a6fd8 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3686,10 +3686,10 @@ void dev_seq_stop(struct seq_file *seq, void *v)
static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
- const struct net_device_stats *stats = dev_get_stats(dev);
+ const struct rtnl_link_stats64 *stats = dev_get_stats(dev);
- seq_printf(seq, "%6s: %7lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
- "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
+ seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
+ "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
dev->name, stats->rx_bytes, stats->rx_packets,
stats->rx_errors,
stats->rx_dropped + stats->rx_missed_errors,
@@ -5266,18 +5266,21 @@ EXPORT_SYMBOL(dev_txq_stats_fold);
* @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.
+ * its own method by setting dev->netdev_ops->get_stats64 or
+ * 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 rtnl_link_stats64 *dev_get_stats(struct net_device *dev)
{
const struct net_device_ops *ops = dev->netdev_ops;
+ if (ops->ndo_get_stats64)
+ return ops->ndo_get_stats64(dev);
if (ops->ndo_get_stats)
- return ops->ndo_get_stats(dev);
+ return (struct rtnl_link_stats64 *)ops->ndo_get_stats(dev);
dev_txq_stats_fold(dev, &dev->stats);
- return &dev->stats;
+ return &dev->stats64;
}
EXPORT_SYMBOL(dev_get_stats);
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 99e7052..ea3bb4c 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -29,6 +29,7 @@ static const char fmt_hex[] = "%#x\n";
static const char fmt_long_hex[] = "%#lx\n";
static const char fmt_dec[] = "%d\n";
static const char fmt_ulong[] = "%lu\n";
+static const char fmt_u64[] = "%llu\n";
static inline int dev_isalive(const struct net_device *dev)
{
@@ -324,14 +325,13 @@ static ssize_t netstat_show(const struct device *d,
struct net_device *dev = to_net_dev(d);
ssize_t ret = -EINVAL;
- WARN_ON(offset > sizeof(struct net_device_stats) ||
- offset % sizeof(unsigned long) != 0);
+ WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
+ offset % sizeof(u64) != 0);
read_lock(&dev_base_lock);
if (dev_isalive(dev)) {
- const struct net_device_stats *stats = dev_get_stats(dev);
- ret = sprintf(buf, fmt_ulong,
- *(unsigned long *)(((u8 *) stats) + offset));
+ const struct rtnl_link_stats64 *stats = dev_get_stats(dev);
+ ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
}
read_unlock(&dev_base_lock);
return ret;
@@ -343,7 +343,7 @@ static ssize_t show_##name(struct device *d, \
struct device_attribute *attr, char *buf) \
{ \
return netstat_show(d, attr, buf, \
- offsetof(struct net_device_stats, name)); \
+ offsetof(struct rtnl_link_stats64, name)); \
} \
static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 1a2af24..e645778 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -579,7 +579,7 @@ static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
}
static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
- const struct net_device_stats *b)
+ const struct rtnl_link_stats64 *b)
{
a->rx_packets = b->rx_packets;
a->tx_packets = b->tx_packets;
@@ -610,7 +610,7 @@ static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
a->tx_compressed = b->tx_compressed;
}
-static void copy_rtnl_link_stats64(void *v, const struct net_device_stats *b)
+static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
{
struct rtnl_link_stats64 a;
@@ -791,7 +791,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
{
struct ifinfomsg *ifm;
struct nlmsghdr *nlh;
- const struct net_device_stats *stats;
+ const struct rtnl_link_stats64 *stats;
struct nlattr *attr;
nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
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