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bonding: fix bond_get_stats()

bond_get_stats() can be called from rtnetlink (with RTNL held)
or from /proc/net/dev seq handler (with RCU held)

The logic added in commit 5f0c5f7 ("bonding: make global bonding
stats more reliable") kind of assumed only one cpu could run there.

If multiple threads are reading /proc/net/dev, stats can be really
messed up after a while.

A second problem is that some fields are 32bit, so we need to properly
handle the wrap around problem.

Given that RTNL is not always held, we need to use
bond_for_each_slave_rcu().

Fixes: 5f0c5f7 ("bonding: make global bonding stats more reliable")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Andy Gospodarek <gospo@cumulusnetworks.com>
Cc: Jay Vosburgh <j.vosburgh@gmail.com>
Cc: Veaceslav Falico <vfalico@gmail.com>
Reviewed-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Eric Dumazet authored and davem330 committed Mar 18, 2016
1 parent eee5772 commit fe30937b65354c7fec244caebbdaae68e28ca797
Showing with 36 additions and 31 deletions.
  1. +35 −31 drivers/net/bonding/bond_main.c
  2. +1 −0 include/net/bonding.h
@@ -3301,6 +3301,30 @@ static int bond_close(struct net_device *bond_dev)
return 0;
}
/* fold stats, assuming all rtnl_link_stats64 fields are u64, but
* that some drivers can provide 32bit values only.
*/
static void bond_fold_stats(struct rtnl_link_stats64 *_res,
const struct rtnl_link_stats64 *_new,
const struct rtnl_link_stats64 *_old)
{
const u64 *new = (const u64 *)_new;
const u64 *old = (const u64 *)_old;
u64 *res = (u64 *)_res;
int i;
for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
u64 nv = new[i];
u64 ov = old[i];
/* detects if this particular field is 32bit only */
if (((nv | ov) >> 32) == 0)
res[i] += (u32)nv - (u32)ov;
else
res[i] += nv - ov;
}
}
static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
struct rtnl_link_stats64 *stats)
{
@@ -3309,44 +3333,23 @@ static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
struct list_head *iter;
struct slave *slave;
spin_lock(&bond->stats_lock);
memcpy(stats, &bond->bond_stats, sizeof(*stats));
bond_for_each_slave(bond, slave, iter) {
const struct rtnl_link_stats64 *sstats =
rcu_read_lock();
bond_for_each_slave_rcu(bond, slave, iter) {
const struct rtnl_link_stats64 *new =
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_nohandler += sstats->rx_nohandler - pstats->rx_nohandler;
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->multicast += sstats->multicast - pstats->multicast;
stats->collisions += sstats->collisions - pstats->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->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;
bond_fold_stats(stats, new, &slave->slave_stats);
/* save off the slave stats for the next run */
memcpy(pstats, sstats, sizeof(*sstats));
memcpy(&slave->slave_stats, new, sizeof(*new));
}
rcu_read_unlock();
memcpy(&bond->bond_stats, stats, sizeof(*stats));
spin_unlock(&bond->stats_lock);
return stats;
}
@@ -4160,6 +4163,7 @@ void bond_setup(struct net_device *bond_dev)
struct bonding *bond = netdev_priv(bond_dev);
spin_lock_init(&bond->mode_lock);
spin_lock_init(&bond->stats_lock);
bond->params = bonding_defaults;
/* Initialize pointers */
View
@@ -215,6 +215,7 @@ struct bonding {
* ALB mode (6) - to sync the use and modifications of its hash table
*/
spinlock_t mode_lock;
spinlock_t stats_lock;
u8 send_peer_notif;
u8 igmp_retrans;
#ifdef CONFIG_PROC_FS

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