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Message-Id: <1411693935-4191-1-git-send-email-gospo@cumulusnetworks.com>
Date: Thu, 25 Sep 2014 21:12:15 -0400
From: Andy Gospodarek <gospo@...ulusnetworks.com>
To: netdev@...r.kernel.org
Cc: j.vosburgh@...il.com, vfalico@...il.com, nikolay@...hat.com
Subject: [PATCH net-next v3] bonding: make global bonding stats more reliable
As the code stands today, bonding stats are based simply on the stats
from the member interfaces. If a member was to be removed from a bond,
the stats would instantly drop. This would be confusing to an admin
would would suddonly see interface stats drop while traffic is still
flowing.
In addition to preventing the stats drops mentioned above, new members
will now be added to the bond and only traffic received after the member
was added to the bond will be counted as part of bonding stats.
v2: Changes suggested by Nik to properly allocate/free stats memory.
v3: Properly destroy workqueue and fix netlink configuration path.
Signed-off-by: Andy Gospodarek <gospo@...ulusnetworks.com>
---
drivers/net/bonding/bond_main.c | 84 +++++++++++++++++++++++++-------------
drivers/net/bonding/bond_netlink.c | 13 +++++-
drivers/net/bonding/bonding.h | 3 ++
3 files changed, 71 insertions(+), 29 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 5390475..10c2dc3 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1147,17 +1147,26 @@ static struct slave *bond_alloc_slave(struct bonding *bond)
slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
if (!slave)
- return NULL;
+ goto slave_fail;
+
+ slave->slave_stats = kzalloc(sizeof(struct rtnl_link_stats64),
+ GFP_KERNEL);
+ if (!slave->slave_stats)
+ goto slave_stats_fail;
if (BOND_MODE(bond) == BOND_MODE_8023AD) {
SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
GFP_KERNEL);
- if (!SLAVE_AD_INFO(slave)) {
- kfree(slave);
- return NULL;
- }
+ if (!SLAVE_AD_INFO(slave))
+ goto slave_ad_fail;
}
return slave;
+slave_ad_fail:
+ kfree(slave->slave_stats);
+slave_stats_fail:
+ kfree(slave);
+slave_fail:
+ return NULL;
}
static void bond_free_slave(struct slave *slave)
@@ -1167,6 +1176,7 @@ static void bond_free_slave(struct slave *slave)
if (BOND_MODE(bond) == BOND_MODE_8023AD)
kfree(SLAVE_AD_INFO(slave));
+ kfree(slave->slave_stats);
kfree(slave);
}
@@ -1344,6 +1354,8 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
}
slave_dev->priv_flags |= IFF_BONDING;
+ /* initialize slave stats */
+ dev_get_stats(new_slave->dev, new_slave->slave_stats);
if (bond_is_lb(bond)) {
/* bond_alb_init_slave() must be called before all other stages since
@@ -3085,38 +3097,43 @@ static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
struct list_head *iter;
struct slave *slave;
- memset(stats, 0, sizeof(*stats));
+ memcpy(stats, bond->bond_stats, sizeof(*stats));
bond_for_each_slave(bond, slave, iter) {
const struct rtnl_link_stats64 *sstats =
dev_get_stats(slave->dev, &temp);
+ struct rtnl_link_stats64 *pstats = slave->slave_stats;
+
+ stats->rx_packets += sstats->rx_packets - pstats->rx_packets;
+ stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes;
+ stats->rx_errors += sstats->rx_errors - pstats->rx_errors;
+ stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped;
- 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 - pstats->tx_packets;;
+ stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes;
+ stats->tx_errors += sstats->tx_errors - pstats->tx_errors;
+ stats->tx_dropped += sstats->tx_dropped - pstats->tx_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 - pstats->multicast;
+ stats->collisions += sstats->collisions - pstats->collisions;
- stats->multicast += sstats->multicast;
- stats->collisions += sstats->collisions;
+ stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors;
+ stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors;
+ stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors;
+ stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors;
+ stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors;
+ stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors;
- 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 - pstats->tx_aborted_errors;
+ stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors;
+ stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors;
+ stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors;
+ stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_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;
+ /* save off the slave stats for the next run */
+ memcpy(pstats, sstats, sizeof(*sstats));
}
+ memcpy(bond->bond_stats, stats, sizeof(*stats));
return stats;
}
@@ -3790,6 +3807,9 @@ static void bond_destructor(struct net_device *bond_dev)
struct bonding *bond = netdev_priv(bond_dev);
if (bond->wq)
destroy_workqueue(bond->wq);
+ if (bond->bond_stats)
+ kfree(bond->bond_stats);
+
free_netdev(bond_dev);
}
@@ -4274,7 +4294,8 @@ unsigned int bond_get_num_tx_queues(void)
int bond_create(struct net *net, const char *name)
{
struct net_device *bond_dev;
- int res;
+ struct bonding *bond;
+ int res = -ENOMEM;
rtnl_lock();
@@ -4286,8 +4307,15 @@ int bond_create(struct net *net, const char *name)
rtnl_unlock();
return -ENOMEM;
}
+ /* alloc persistent stats for the bond */
+ bond = netdev_priv(bond_dev);
+ bond->bond_stats = kzalloc(sizeof(struct rtnl_link_stats64),
+ GFP_KERNEL);
+ if (!bond->bond_stats)
+ printk(KERN_CRIT "Stats not available!\n");
dev_net_set(bond_dev, net);
+
bond_dev->rtnl_link_ops = &bond_link_ops;
res = register_netdevice(bond_dev);
diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index c13d83e..2fdcbe2 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -381,10 +381,21 @@ static int bond_newlink(struct net *src_net, struct net_device *bond_dev,
struct nlattr *tb[], struct nlattr *data[])
{
int err;
+ struct bonding *bond = netdev_priv(bond_dev);
+
+ /* alloc persistent stats for the bond if not already allocated */
+ if (!bond->bond_stats) {
+ bond->bond_stats = kzalloc(sizeof(struct rtnl_link_stats64),
+ GFP_KERNEL);
+ if (!bond->bond_stats)
+ return -ENOMEM;
+ }
err = bond_changelink(bond_dev, tb, data);
- if (err < 0)
+ if (err < 0) {
+ kfree(bond->bond_stats);
return err;
+ }
return register_netdevice(bond_dev);
}
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index 6140bf0..fe25265 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -24,6 +24,7 @@
#include <linux/inetdevice.h>
#include <linux/etherdevice.h>
#include <linux/reciprocal_div.h>
+#include <linux/if_link.h>
#include "bond_3ad.h"
#include "bond_alb.h"
@@ -175,6 +176,7 @@ struct slave {
struct netpoll *np;
#endif
struct kobject kobj;
+ struct rtnl_link_stats64 *slave_stats;
};
/*
@@ -224,6 +226,7 @@ struct bonding {
/* debugging support via debugfs */
struct dentry *debug_dir;
#endif /* CONFIG_DEBUG_FS */
+ struct rtnl_link_stats64 *bond_stats;
};
#define bond_slave_get_rcu(dev) \
--
1.9.3
--
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