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l2tp: fix locking of 64-bit counters for smp

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L2TP uses 64-bit counters but since these are not updated atomically,
we need to make them safe for smp. This patch addresses that.

Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
James Chapman
2012-04-29 21:48:46 +00:00
committed by David S. Miller
parent 80bcb4238d
commit 5de7aee541
3 changed files with 103 additions and 35 deletions
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62
net/l2tp/l2tp_netlink.c
View File

@@ -225,6 +225,8 @@ static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 pid, u32 seq, int flags,
struct nlattr *nest;
struct sock *sk = NULL;
struct inet_sock *inet;
struct l2tp_stats stats;
unsigned int start;
hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags,
L2TP_CMD_TUNNEL_GET);
@@ -242,16 +244,28 @@ static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 pid, u32 seq, int flags,
if (nest == NULL)
goto nla_put_failure;
if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, tunnel->stats.tx_packets) ||
nla_put_u64(skb, L2TP_ATTR_TX_BYTES, tunnel->stats.tx_bytes) ||
nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, tunnel->stats.tx_errors) ||
nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, tunnel->stats.rx_packets) ||
nla_put_u64(skb, L2TP_ATTR_RX_BYTES, tunnel->stats.rx_bytes) ||
do {
start = u64_stats_fetch_begin(&tunnel->stats.syncp);
stats.tx_packets = tunnel->stats.tx_packets;
stats.tx_bytes = tunnel->stats.tx_bytes;
stats.tx_errors = tunnel->stats.tx_errors;
stats.rx_packets = tunnel->stats.rx_packets;
stats.rx_bytes = tunnel->stats.rx_bytes;
stats.rx_errors = tunnel->stats.rx_errors;
stats.rx_seq_discards = tunnel->stats.rx_seq_discards;
stats.rx_oos_packets = tunnel->stats.rx_oos_packets;
} while (u64_stats_fetch_retry(&tunnel->stats.syncp, start));
if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, stats.tx_packets) ||
nla_put_u64(skb, L2TP_ATTR_TX_BYTES, stats.tx_bytes) ||
nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, stats.tx_errors) ||
nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, stats.rx_packets) ||
nla_put_u64(skb, L2TP_ATTR_RX_BYTES, stats.rx_bytes) ||
nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
tunnel->stats.rx_seq_discards) ||
stats.rx_seq_discards) ||
nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
tunnel->stats.rx_oos_packets) ||
nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, tunnel->stats.rx_errors))
stats.rx_oos_packets) ||
nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, stats.rx_errors))
goto nla_put_failure;
nla_nest_end(skb, nest);
@@ -563,6 +577,8 @@ static int l2tp_nl_session_send(struct sk_buff *skb, u32 pid, u32 seq, int flags
struct nlattr *nest;
struct l2tp_tunnel *tunnel = session->tunnel;
struct sock *sk = NULL;
struct l2tp_stats stats;
unsigned int start;
sk = tunnel->sock;
@@ -600,19 +616,33 @@ static int l2tp_nl_session_send(struct sk_buff *skb, u32 pid, u32 seq, int flags
(session->reorder_timeout &&
nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout)))
goto nla_put_failure;
nest = nla_nest_start(skb, L2TP_ATTR_STATS);
if (nest == NULL)
goto nla_put_failure;
if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, session->stats.tx_packets) ||
nla_put_u64(skb, L2TP_ATTR_TX_BYTES, session->stats.tx_bytes) ||
nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, session->stats.tx_errors) ||
nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, session->stats.rx_packets) ||
nla_put_u64(skb, L2TP_ATTR_RX_BYTES, session->stats.rx_bytes) ||
do {
start = u64_stats_fetch_begin(&session->stats.syncp);
stats.tx_packets = session->stats.tx_packets;
stats.tx_bytes = session->stats.tx_bytes;
stats.tx_errors = session->stats.tx_errors;
stats.rx_packets = session->stats.rx_packets;
stats.rx_bytes = session->stats.rx_bytes;
stats.rx_errors = session->stats.rx_errors;
stats.rx_seq_discards = session->stats.rx_seq_discards;
stats.rx_oos_packets = session->stats.rx_oos_packets;
} while (u64_stats_fetch_retry(&session->stats.syncp, start));
if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, stats.tx_packets) ||
nla_put_u64(skb, L2TP_ATTR_TX_BYTES, stats.tx_bytes) ||
nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, stats.tx_errors) ||
nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, stats.rx_packets) ||
nla_put_u64(skb, L2TP_ATTR_RX_BYTES, stats.rx_bytes) ||
nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
session->stats.rx_seq_discards) ||
stats.rx_seq_discards) ||
nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
session->stats.rx_oos_packets) ||
nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, session->stats.rx_errors))
stats.rx_oos_packets) ||
nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, stats.rx_errors))
goto nla_put_failure;
nla_nest_end(skb, nest);