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Date: Sat, 28 Apr 2007 15:46:01 +1000
From: Rusty Russell <rusty@...tcorp.com.au>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
Jeff Garzik <jgarzik@...ox.com>, buytenh@....org
Subject: Re: [NET]: Get rid of NETIF_F_INTERNAL_STATS
On Wed, 2007-04-11 at 22:23 +1000, Herbert Xu wrote:
> On Wed, Apr 11, 2007 at 10:15:51PM +1000, Rusty Russell wrote:
> >
> > Actually, I did this precisely because I really didn't want to start
> > exposing bogus stats in /proc/net/dev. An audit might clarify if this
> > is an actual issue.
>
> Fair enough. Still returning zeros when get_stats isn't available
> would seem safe enough. I wasn't able to find any drivers which
> didn't have get_stats.
OK, I did a quick check, and the only one I could find was br_if.c which
calls register_netdevice() and doesn't set get_stats. I don't think
that zeroes in this case matters.
So here's a patch inspired by Herbert's patch, but also gets all those
places which I modified previously to check for get_stats returning
NULL.
==
Remove NETIF_F_INTERNAL_STATS: default to internal stats.
Herbert Xu conviced me that a new flag was overkill; every driver
currently overrides get_stats, so we might as well make the internal
one the default. If someone did fail to set get_stats, they would now
get all 0 stats instead of "No statistics available".
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
diff -r ceab3c131ee5 arch/s390/appldata/appldata_net_sum.c
--- a/arch/s390/appldata/appldata_net_sum.c Sat Apr 28 14:39:41 2007 +1000
+++ b/arch/s390/appldata/appldata_net_sum.c Sat Apr 28 15:09:46 2007 +1000
@@ -109,9 +109,6 @@ static void appldata_get_net_sum_data(vo
read_lock(&dev_base_lock);
for (dev = dev_base; dev != NULL; dev = dev->next) {
stats = dev->get_stats(dev);
- if (stats == NULL) {
- continue;
- }
rx_packets += stats->rx_packets;
tx_packets += stats->tx_packets;
rx_bytes += stats->rx_bytes;
diff -r ceab3c131ee5 drivers/net/bonding/bond_main.c
--- a/drivers/net/bonding/bond_main.c Sat Apr 28 14:39:41 2007 +1000
+++ b/drivers/net/bonding/bond_main.c Sat Apr 28 15:10:24 2007 +1000
@@ -1360,13 +1360,6 @@ int bond_enslave(struct net_device *bond
goto err_undo_flags;
}
- if (slave_dev->get_stats == NULL) {
- printk(KERN_NOTICE DRV_NAME
- ": %s: the driver for slave device %s does not provide "
- "get_stats function, network statistics will be "
- "inaccurate.\n", bond_dev->name, slave_dev->name);
- }
-
new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
if (!new_slave) {
res = -ENOMEM;
@@ -3641,33 +3634,31 @@ static struct net_device_stats *bond_get
bond_for_each_slave(bond, slave, i) {
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;
- stats->rx_dropped += sstats->rx_dropped;
-
- stats->tx_packets += sstats->tx_packets;
- stats->tx_bytes += sstats->tx_bytes;
- stats->tx_errors += sstats->tx_errors;
- stats->tx_dropped += sstats->tx_dropped;
-
- stats->multicast += sstats->multicast;
- stats->collisions += sstats->collisions;
-
- stats->rx_length_errors += sstats->rx_length_errors;
- stats->rx_over_errors += sstats->rx_over_errors;
- stats->rx_crc_errors += sstats->rx_crc_errors;
- stats->rx_frame_errors += sstats->rx_frame_errors;
- stats->rx_fifo_errors += sstats->rx_fifo_errors;
- stats->rx_missed_errors += sstats->rx_missed_errors;
-
- stats->tx_aborted_errors += sstats->tx_aborted_errors;
- stats->tx_carrier_errors += sstats->tx_carrier_errors;
- stats->tx_fifo_errors += sstats->tx_fifo_errors;
- stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
- stats->tx_window_errors += sstats->tx_window_errors;
- }
+ stats->rx_packets += sstats->rx_packets;
+ stats->rx_bytes += sstats->rx_bytes;
+ stats->rx_errors += sstats->rx_errors;
+ stats->rx_dropped += sstats->rx_dropped;
+
+ stats->tx_packets += sstats->tx_packets;
+ stats->tx_bytes += sstats->tx_bytes;
+ stats->tx_errors += sstats->tx_errors;
+ stats->tx_dropped += sstats->tx_dropped;
+
+ stats->multicast += sstats->multicast;
+ stats->collisions += sstats->collisions;
+
+ stats->rx_length_errors += sstats->rx_length_errors;
+ stats->rx_over_errors += sstats->rx_over_errors;
+ stats->rx_crc_errors += sstats->rx_crc_errors;
+ stats->rx_frame_errors += sstats->rx_frame_errors;
+ stats->rx_fifo_errors += sstats->rx_fifo_errors;
+ stats->rx_missed_errors += sstats->rx_missed_errors;
+
+ stats->tx_aborted_errors += sstats->tx_aborted_errors;
+ stats->tx_carrier_errors += sstats->tx_carrier_errors;
+ stats->tx_fifo_errors += sstats->tx_fifo_errors;
+ stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
+ stats->tx_window_errors += sstats->tx_window_errors;
}
read_unlock_bh(&bond->lock);
diff -r ceab3c131ee5 drivers/parisc/led.c
--- a/drivers/parisc/led.c Sat Apr 28 14:39:41 2007 +1000
+++ b/drivers/parisc/led.c Sat Apr 28 15:09:36 2007 +1000
@@ -373,8 +373,6 @@ static __inline__ int led_get_net_activi
if (LOOPBACK(in_dev->ifa_list->ifa_local))
continue;
stats = dev->get_stats(dev);
- if (!stats)
- continue;
rx_total += stats->rx_packets;
tx_total += stats->tx_packets;
}
diff -r ceab3c131ee5 include/linux/netdevice.h
--- a/include/linux/netdevice.h Sat Apr 28 14:39:41 2007 +1000
+++ b/include/linux/netdevice.h Sat Apr 28 15:09:13 2007 +1000
@@ -325,7 +325,6 @@ 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
diff -r ceab3c131ee5 net/core/dev.c
--- a/net/core/dev.c Sat Apr 28 14:39:41 2007 +1000
+++ b/net/core/dev.c Sat Apr 28 15:09:02 2007 +1000
@@ -2105,26 +2105,23 @@ static void dev_seq_printf_stats(struct
{
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,
- stats->rx_errors,
- stats->rx_dropped + stats->rx_missed_errors,
- stats->rx_fifo_errors,
- stats->rx_length_errors + stats->rx_over_errors +
- stats->rx_crc_errors + stats->rx_frame_errors,
- stats->rx_compressed, stats->multicast,
- stats->tx_bytes, stats->tx_packets,
- stats->tx_errors, stats->tx_dropped,
- stats->tx_fifo_errors, stats->collisions,
- stats->tx_carrier_errors +
- stats->tx_aborted_errors +
- stats->tx_window_errors +
- stats->tx_heartbeat_errors,
- stats->tx_compressed);
- } else
- seq_printf(seq, "%6s: No statistics available.\n", dev->name);
+ 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,
+ stats->rx_errors,
+ stats->rx_dropped + stats->rx_missed_errors,
+ stats->rx_fifo_errors,
+ stats->rx_length_errors + stats->rx_over_errors +
+ stats->rx_crc_errors + stats->rx_frame_errors,
+ stats->rx_compressed, stats->multicast,
+ stats->tx_bytes, stats->tx_packets,
+ stats->tx_errors, stats->tx_dropped,
+ stats->tx_fifo_errors, stats->collisions,
+ stats->tx_carrier_errors +
+ stats->tx_aborted_errors +
+ stats->tx_window_errors +
+ stats->tx_heartbeat_errors,
+ stats->tx_compressed);
}
/*
@@ -3287,11 +3284,9 @@ 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;
+static struct net_device_stats *internal_stats(struct net_device *dev)
+{
+ return &dev->stats;
}
/**
@@ -3329,7 +3324,7 @@ struct net_device *alloc_netdev(int size
if (sizeof_priv)
dev->priv = netdev_priv(dev);
- dev->get_stats = maybe_internal_stats;
+ dev->get_stats = internal_stats;
setup(dev);
strcpy(dev->name, name);
return dev;
-
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