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openvswitch: Refactor recirc key allocation. 

The logic of allocating and copy key for each 'exec_actions_level'
was specific to execute_recirc(). However, future patches will reuse
as well.  Refactor the logic into its own function clone_key().

Signed-off-by: Andy Zhou <azhou@ovn.org>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
zero-colors
andy zhou 2017-03-20 16:32:28 -07:00 committed by David S. Miller
parent 47c697aa2d
commit 4572ef52a0
1 changed files with 40 additions and 26 deletions
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66
net/openvswitch/actions.c
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2007-2014 Nicira, Inc.
* Copyright (c) 2007-2017 Nicira, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
@ -83,14 +83,31 @@ struct action_fifo {
struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE];
};
struct recirc_keys {
struct action_flow_keys {
struct sw_flow_key key[OVS_DEFERRED_ACTION_THRESHOLD];
};
static struct action_fifo __percpu *action_fifos;
static struct recirc_keys __percpu *recirc_keys;
static struct action_flow_keys __percpu *flow_keys;
static DEFINE_PER_CPU(int, exec_actions_level);
/* Make a clone of the 'key', using the pre-allocated percpu 'flow_keys'
* space. Return NULL if out of key spaces.
*/
static struct sw_flow_key *clone_key(const struct sw_flow_key *key_)
{
struct action_flow_keys *keys = this_cpu_ptr(flow_keys);
int level = this_cpu_read(exec_actions_level);
struct sw_flow_key *key = NULL;
if (level <= OVS_DEFERRED_ACTION_THRESHOLD) {
key = &keys->key[level - 1];
*key = *key_;
}
return key;
}
static void action_fifo_init(struct action_fifo *fifo)
{
fifo->head = 0;
@ -1090,8 +1107,8 @@ static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
struct sw_flow_key *key,
const struct nlattr *a, int rem)
{
struct sw_flow_key *recirc_key;
struct deferred_action *da;
int level;
if (!is_flow_key_valid(key)) {
int err;
@ -1115,29 +1132,26 @@ static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
return 0;
}
level = this_cpu_read(exec_actions_level);
if (level <= OVS_DEFERRED_ACTION_THRESHOLD) {
struct recirc_keys *rks = this_cpu_ptr(recirc_keys);
struct sw_flow_key *recirc_key = &rks->key[level - 1];
*recirc_key = *key;
/* If within the limit of 'OVS_DEFERRED_ACTION_THRESHOLD',
* recirc immediately, otherwise, defer it for later execution.
*/
recirc_key = clone_key(key);
if (recirc_key) {
recirc_key->recirc_id = nla_get_u32(a);
ovs_dp_process_packet(skb, recirc_key);
return 0;
}
da = add_deferred_actions(skb, key, NULL, 0);
if (da) {
da->pkt_key.recirc_id = nla_get_u32(a);
} else {
kfree_skb(skb);
if (net_ratelimit())
pr_warn("%s: deferred action limit reached, drop recirc action\n",
ovs_dp_name(dp));
da = add_deferred_actions(skb, key, NULL, 0);
if (da) {
recirc_key = &da->pkt_key;
recirc_key->recirc_id = nla_get_u32(a);
} else {
/* Log an error in case action fifo is full. */
kfree_skb(skb);
if (net_ratelimit())
pr_warn("%s: deferred action limit reached, drop recirc action\n",
ovs_dp_name(dp));
}
}
return 0;
}
@ -1327,8 +1341,8 @@ int action_fifos_init(void)
if (!action_fifos)
return -ENOMEM;
recirc_keys = alloc_percpu(struct recirc_keys);
if (!recirc_keys) {
flow_keys = alloc_percpu(struct action_flow_keys);
if (!flow_keys) {
free_percpu(action_fifos);
return -ENOMEM;
}
@ -1339,5 +1353,5 @@ int action_fifos_init(void)
void action_fifos_exit(void)
{
free_percpu(action_fifos);
free_percpu(recirc_keys);
free_percpu(flow_keys);
}