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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>
hifive-unleashed-5.1
Pravin B Shelar 2013-07-30 15:39:39 -07:00 committed by Jesse Gross
parent 2771399ac9
commit d57170b1b1
1 changed files with 9 additions and 8 deletions
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17
net/openvswitch/datapath.c
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@ -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;
}