datapath: Rename last_action() as nla_is_last() and move to netlink.h

The original motivation for this change was to allow the helper to be used
in files other than actions.c as part of work on an odp select group
action.

It was as pointed out by Thomas Graf that this helper would be best off
living in netlink.h. Furthermore, I think that the generic nature of this
helper means it is best off in netlink.h regardless of if it is used more
than one .c file or not. Thus, I would like it considered independent of
the work on an odp select group action.

Cc: Thomas Graf <tgraf@suug.ch>
Cc: Pravin Shelar <pshelar@nicira.com>
Cc: Andy Zhou <azhou@nicira.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Acked-by: Thomas Graf <tgraf@noironetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/netlink.h b/include/net/netlink.h
index 7b903e1bdbbb0e38d71a7b7cb9d8e8911918226e..64158353ecb2750a3165dc07e915755ccb801522 100644 (file)
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -1185,4 +1185,14 @@ static inline int nla_validate_nested(const struct nlattr *start, int maxtype,
 #define nla_for_each_nested(pos, nla, rem) \
        nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem)
 
+/**
+ * nla_is_last - Test if attribute is last in stream
+ * @nla: attribute to test
+ * @rem: bytes remaining in stream
+ */
+static inline bool nla_is_last(const struct nlattr *nla, int rem)
+{
+       return nla->nla_len == rem;
+}
+
 #endif

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 006886dbee36b075fc7054ec1ddc87781a75d739..922c133b1933c9cad99f45629b70d5165ec91f91 100644 (file)
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -504,11 +504,6 @@ static int output_userspace(struct datapath *dp, struct sk_buff *skb,
        return ovs_dp_upcall(dp, skb, &upcall);
 }
 
-static bool last_action(const struct nlattr *a, int rem)
-{
-       return a->nla_len == rem;
-}
-
 static int sample(struct datapath *dp, struct sk_buff *skb,
                  struct sw_flow_key *key, const struct nlattr *attr)
 {
@@ -543,7 +538,7 @@ static int sample(struct datapath *dp, struct sk_buff *skb,
         * user space. This skb will be consumed by its caller.
         */
        if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE &&
-                  last_action(a, rem)))
+                  nla_is_last(a, rem)))
                return output_userspace(dp, skb, key, a);
 
        skb = skb_clone(skb, GFP_ATOMIC);
@@ -633,7 +628,7 @@ static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
        if (err)
                return err;
 
-       if (!last_action(a, rem)) {
+       if (!nla_is_last(a, rem)) {
                /* Recirc action is the not the last action
                 * of the action list, need to clone the skb.
                 */
@@ -707,7 +702,7 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
 
                case OVS_ACTION_ATTR_RECIRC:
                        err = execute_recirc(dp, skb, key, a, rem);
-                       if (last_action(a, rem)) {
+                       if (nla_is_last(a, rem)) {
                                /* If this is the last action, the skb has
                                 * been consumed or freed.
                                 * Return immediately.