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| author | Pravin B Shelar <pshelar@nicira.com> | 2013-07-30 15:39:39 -0700 |
|---|---|---|
| committer | Jesse Gross <jesse@nicira.com> | 2013-08-23 16:37:59 -0700 |
| commit | d57170b1b1d71382a0d9cf31b01364a97add3f19 (patch) | |
| tree | 7d8ce91219303f31fa7e08ab22c0735580cfcde3 /net/openvswitch | |
| parent | 2771399ac9986c75437a83b1c723493cfcdfa439 (diff) | |
| download | linux-d57170b1b1d71382a0d9cf31b01364a97add3f19.tar.gz linux-d57170b1b1d71382a0d9cf31b01364a97add3f19.tar.bz2 linux-d57170b1b1d71382a0d9cf31b01364a97add3f19.zip | |
openvswitch: Use RCU lock for flow dump operation.
Flow dump operation is read-only operation. There is no need to
take ovs-lock. Following patch use rcu-lock for dumping flows.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
Diffstat (limited to 'net/openvswitch')
| -rw-r--r-- | net/openvswitch/datapath.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c index f2ed7600084e..e6fb866e4ed4 100644 --- a/net/openvswitch/datapath.c +++ b/net/openvswitch/datapath.c @@ -1104,7 +1104,6 @@ static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, u32 seq, u32 flags, u8 cmd) { const int skb_orig_len = skb->len; - const struct sw_flow_actions *sf_acts; struct nlattr *start; struct ovs_flow_stats stats; struct ovs_header *ovs_header; @@ -1113,8 +1112,6 @@ static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, u8 tcp_flags; int err; - sf_acts = ovsl_dereference(flow->sf_acts); - ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd); if (!ovs_header) return -EMSGSIZE; @@ -1161,6 +1158,11 @@ static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, */ start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); if (start) { + const struct sw_flow_actions *sf_acts; + + sf_acts = rcu_dereference_check(flow->sf_acts, + lockdep_ovsl_is_held()); + err = actions_to_attr(sf_acts->actions, sf_acts->actions_len, skb); if (!err) nla_nest_end(skb, start); @@ -1440,15 +1442,14 @@ static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) struct datapath *dp; struct flow_table *table; - ovs_lock(); + rcu_read_lock(); dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); if (!dp) { - ovs_unlock(); + rcu_read_unlock(); return -ENODEV; } - table = ovsl_dereference(dp->table); - + table = rcu_dereference(dp->table); for (;;) { struct sw_flow *flow; u32 bucket, obj; @@ -1468,7 +1469,7 @@ static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) cb->args[0] = bucket; cb->args[1] = obj; } - ovs_unlock(); + rcu_read_unlock(); return skb->len; } |