[PATCH net-next] mlxsw: spectrum: Fix compilation error when CLS_ACT isn't set

[Ido Schimmel]

When CONFIG_NET_CLS_ACT isn't set 'struct tcf_exts' has no member named
'actions' and we therefore must not access it. Otherwise compilation
fails.

Fix this by introducing a new macro similar to tc_no_actions(), which
always returns 'false' if CONFIG_NET_CLS_ACT isn't set.

Fixes: 763b4b70afcd ("mlxsw: spectrum: Add support in matchall mirror TC 
offloading")
Reported-by: kbuild test robot <fengguang...@intel.com>
Signed-off-by: Jiri Pirko <j...@mellanox.com>
Signed-off-by: Ido Schimmel <ido...@mellanox.com>
---
I know the merge window is already open, but I thought you might want to take
this as well, as it fixes a compilation error.
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum.c | 11 +++++------
 include/net/act_api.h                          |  4 ++++
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 552636b..c3e6150 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -1148,23 +1148,22 @@ static int mlxsw_sp_port_add_cls_matchall(struct 
mlxsw_sp_port *mlxsw_sp_port,
                                          struct tc_cls_matchall_offload *cls,
                                          bool ingress)
 {
-       struct tcf_exts *exts = cls->exts;
        const struct tc_action *a;
        int err;
 
-       if (!list_is_singular(&exts->actions)) {
+       if (!tc_single_action(cls->exts)) {
                netdev_err(mlxsw_sp_port->dev, "only singular actions are 
supported\n");
                return -ENOTSUPP;
        }
 
-       a = list_first_entry(&exts->actions, struct tc_action, list);
-       if (is_tcf_mirred_mirror(a) && protocol == htons(ETH_P_ALL)) {
+       tc_for_each_action(a, cls->exts) {
+               if (!is_tcf_mirred_mirror(a) || protocol != htons(ETH_P_ALL))
+                       return -ENOTSUPP;
+
                err = mlxsw_sp_port_add_cls_matchall_mirror(mlxsw_sp_port, cls,
                                                            a, ingress);
                if (err)
                        return err;
-       } else {
-               return -ENOTSUPP;
        }
 
        return 0;
diff --git a/include/net/act_api.h b/include/net/act_api.h
index fb82b5b..0bb2106 100644
--- a/include/net/act_api.h
+++ b/include/net/act_api.h
@@ -192,6 +192,9 @@ int tcf_action_copy_stats(struct sk_buff *, struct 
tc_action *, int);
 #define tc_for_each_action(_a, _exts) \
        list_for_each_entry(a, &(_exts)->actions, list)
 
+#define tc_single_action(_exts) \
+       (list_is_singular(&(_exts)->actions))
+
 static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
                                           u64 packets, u64 lastuse)
 {
@@ -205,6 +208,7 @@ static inline void tcf_action_stats_update(struct tc_action 
*a, u64 bytes,
 
 #define tc_no_actions(_exts) true
 #define tc_for_each_action(_a, _exts) while ((void)(_a), 0)
+#define tc_single_action(_exts) false
 #define tcf_action_stats_update(a, bytes, packets, lastuse)
 
 #endif /* CONFIG_NET_CLS_ACT */
-- 
2.8.2