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openvswitch: kernel datapath clone action

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Add 'clone' action to kernel datapath by using existing functions.
When actions within clone don't modify the current flow, the flow
key is not cloned before executing clone actions.

This is a follow up patch for this incomplete work:
https://patchwork.ozlabs.org/patch/722096/

v1 -> v2:
Refactor as advised by reviewer.

Signed-off-by: Yifeng Sun <pkusunyifeng@gmail.com>
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>
This commit is contained in:
Yifeng Sun
2018-07-02 08:18:03 -07:00
committed by David S. Miller
parent 20fbdc3572
commit b233504033
4 changed files with 114 additions and 0 deletions
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33
net/openvswitch/actions.c
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@@ -1057,6 +1057,28 @@ static int sample(struct datapath *dp, struct sk_buff *skb,
clone_flow_key);
}
/* When 'last' is true, clone() should always consume the 'skb'.
* Otherwise, clone() should keep 'skb' intact regardless what
* actions are executed within clone().
*/
static int clone(struct datapath *dp, struct sk_buff *skb,
struct sw_flow_key *key, const struct nlattr *attr,
bool last)
{
struct nlattr *actions;
struct nlattr *clone_arg;
int rem = nla_len(attr);
bool dont_clone_flow_key;
/* The first action is always 'OVS_CLONE_ATTR_ARG'. */
clone_arg = nla_data(attr);
dont_clone_flow_key = nla_get_u32(clone_arg);
actions = nla_next(clone_arg, &rem);
return clone_execute(dp, skb, key, 0, actions, rem, last,
!dont_clone_flow_key);
}
static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key,
const struct nlattr *attr)
{
@@ -1336,6 +1358,17 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
consume_skb(skb);
return 0;
}
break;
case OVS_ACTION_ATTR_CLONE: {
bool last = nla_is_last(a, rem);
err = clone(dp, skb, key, a, last);
if (last)
return err;
break;
}
}
if (unlikely(err)) {