GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-21 14:11:20 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

openvswitch: Factor out allocation and verification of actions.

Browse source 
As the size of the flow key grows, it can put some pressure on the
stack. This is particularly true in ovs_flow_cmd_set(), which needs several
copies of the key on the stack. One of those uses is logically separate,
so this factors it out to reduce stack pressure and improve readibility.

Signed-off-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: Andy Zhou <azhou@nicira.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesse Gross 2014-10-03 15:35:32 -07:00 • committed by David S. Miller
parent f0b128c1e2
commit 6b205b2ca1
1 changed files with 27 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

36
net/openvswitch/datapath.c
View file

@ -933,11 +933,34 @@ error:
return error; return error;
} }
static struct sw_flow_actions *get_flow_actions(const struct nlattr *a,
const struct sw_flow_key *key,
const struct sw_flow_mask *mask)
{
struct sw_flow_actions *acts;
struct sw_flow_key masked_key;
int error;
acts = ovs_nla_alloc_flow_actions(nla_len(a));
if (IS_ERR(acts))
return acts;
ovs_flow_mask_key(&masked_key, key, mask);
error = ovs_nla_copy_actions(a, &masked_key, 0, &acts);
if (error) {
OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
kfree(acts);
return ERR_PTR(error);
}
return acts;
}
static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
{ {
struct nlattr **a = info->attrs; struct nlattr **a = info->attrs;
struct ovs_header *ovs_header = info->userhdr; struct ovs_header *ovs_header = info->userhdr;
struct sw_flow_key key, masked_key; struct sw_flow_key key;
struct sw_flow *flow; struct sw_flow *flow;
struct sw_flow_mask mask; struct sw_flow_mask mask;
struct sk_buff *reply = NULL; struct sk_buff *reply = NULL;
@ -959,17 +982,10 @@ static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
/* Validate actions. */ /* Validate actions. */
if (a[OVS_FLOW_ATTR_ACTIONS]) { if (a[OVS_FLOW_ATTR_ACTIONS]) {
acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS])); acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask);
if (IS_ERR(acts)) {
error = PTR_ERR(acts); error = PTR_ERR(acts);
if (IS_ERR(acts))
goto error; goto error;
ovs_flow_mask_key(&masked_key, &key, &mask);
error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
&masked_key, 0, &acts);
if (error) {
OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
goto err_kfree_acts;
} }
} }