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Date: Wed, 28 Mar 2007 08:52:24 -0700
From: Stephen Hemminger <shemminger@...l.org>
To: Rusty Russell <rusty@...tcorp.com.au>
CC: netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] Inline net_device_stats
Rusty Russell wrote:
> Hi all,
>
> Does something like this make sense for future drivers?
>
> Cheers,
> Rusty.
> ===
> Network drivers which keep stats allocate their own stats structure
> then write a get_stats() function to return them. It would be nice if
> this were done by default.
>
> 1) Add a new "stats" field to "struct net_device".
> 2) Add a new feature field to say "this driver uses the internal one"
> 3) Have a default "get_stats" which returns NULL if that feature not set.
> 4) Change callers to check result of get_stats call for NULL, not if
> ->get_stats is set.
>
> This should not break backwards compatibility with older drivers, yet
> allow modern drivers to shed some boilerplate code.
>
> Lightly tested: works for a modified lguest network driver.
>
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> ---
> 0 files changed
>
> diff -r 1ccab0a087b7 arch/s390/appldata/appldata_net_sum.c
> --- a/arch/s390/appldata/appldata_net_sum.c Tue Mar 27 13:46:10 2007 +1000
> +++ b/arch/s390/appldata/appldata_net_sum.c Tue Mar 27 14:28:47 2007 +1000
> @@ -108,10 +108,10 @@ static void appldata_get_net_sum_data(vo
> collisions = 0;
> read_lock(&dev_base_lock);
> for (dev = dev_base; dev != NULL; dev = dev->next) {
> - if (dev->get_stats == NULL) {
> + stats = dev->get_stats(dev);
> + if (stats == NULL) {
> continue;
> }
> - stats = dev->get_stats(dev);
> rx_packets += stats->rx_packets;
> tx_packets += stats->tx_packets;
> rx_bytes += stats->rx_bytes;
> diff -r 1ccab0a087b7 drivers/net/bonding/bond_main.c
> --- a/drivers/net/bonding/bond_main.c Tue Mar 27 13:46:10 2007 +1000
> +++ b/drivers/net/bonding/bond_main.c Tue Mar 27 14:29:08 2007 +1000
> @@ -3621,9 +3621,8 @@ static struct net_device_stats *bond_get
> read_lock_bh(&bond->lock);
>
> bond_for_each_slave(bond, slave, i) {
> - if (slave->dev->get_stats) {
> - sstats = slave->dev->get_stats(slave->dev);
> -
> + sstats = slave->dev->get_stats(slave->dev);
> + if (sstats) {
> stats->rx_packets += sstats->rx_packets;
> stats->rx_bytes += sstats->rx_bytes;
> stats->rx_errors += sstats->rx_errors;
> diff -r 1ccab0a087b7 drivers/parisc/led.c
> --- a/drivers/parisc/led.c Tue Mar 27 13:46:10 2007 +1000
> +++ b/drivers/parisc/led.c Tue Mar 27 14:29:17 2007 +1000
> @@ -372,9 +372,9 @@ static __inline__ int led_get_net_activi
> continue;
> if (LOOPBACK(in_dev->ifa_list->ifa_local))
> continue;
> - if (!dev->get_stats)
> + stats = dev->get_stats(dev);
> + if (!stats)
> continue;
> - stats = dev->get_stats(dev);
> rx_total += stats->rx_packets;
> tx_total += stats->tx_packets;
> }
> diff -r 1ccab0a087b7 include/linux/netdevice.h
> --- a/include/linux/netdevice.h Tue Mar 27 13:46:10 2007 +1000
> +++ b/include/linux/netdevice.h Tue Mar 27 14:21:09 2007 +1000
> @@ -325,6 +325,7 @@ struct net_device
> #define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
> #define NETIF_F_GSO 2048 /* Enable software GSO. */
> #define NETIF_F_LLTX 4096 /* LockLess TX */
> +#define NETIF_F_INTERNAL_STATS 8192 /* Use stats structure in net_device */
>
> /* Segmentation offload features */
> #define NETIF_F_GSO_SHIFT 16
> @@ -349,6 +350,7 @@ struct net_device
>
>
> struct net_device_stats* (*get_stats)(struct net_device *dev);
> + struct net_device_stats stats;
>
> #ifdef CONFIG_WIRELESS_EXT
> /* List of functions to handle Wireless Extensions (instead of ioctl).
> diff -r 1ccab0a087b7 net/core/dev.c
> --- a/net/core/dev.c Tue Mar 27 13:46:10 2007 +1000
> +++ b/net/core/dev.c Tue Mar 27 14:30:05 2007 +1000
> @@ -825,7 +825,6 @@ static int default_rebuild_header(struct
> return 1;
> }
>
> -
> /**
> * dev_open - prepare an interface for use.
> * @dev: device to open
> @@ -2120,9 +2119,9 @@ void dev_seq_stop(struct seq_file *seq,
>
> static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
> {
> - if (dev->get_stats) {
> - struct net_device_stats *stats = dev->get_stats(dev);
> -
> + struct net_device_stats *stats = dev->get_stats(dev);
> +
> + if (stats) {
> seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
> "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
> dev->name, stats->rx_bytes, stats->rx_packets,
> @@ -3146,6 +3145,13 @@ out:
> mutex_unlock(&net_todo_run_mutex);
> }
>
> +static struct net_device_stats *maybe_internal_stats(struct net_device *dev)
> +{
> + if (dev->features & NETIF_F_INTERNAL_STATS)
> + return &dev->stats;
> + return NULL;
> +}
> +
> /**
> * alloc_netdev - allocate network device
> * @sizeof_priv: size of private data to allocate space for
> @@ -3181,6 +3187,7 @@ struct net_device *alloc_netdev(int size
> if (sizeof_priv)
> dev->priv = netdev_priv(dev);
>
> + dev->get_stats = maybe_internal_stats;
> setup(dev);
> strcpy(dev->name, name);
> return dev;
>
>
>
It would make sense to do it per-cpu and 64 bit for the non-error counters.
-
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