[PATCH net-next v4 2/9] net/sched: act_pedit, setup offload action for action stats query

[Oz Shlomo <ozsh@nvidia.com>]

A single tc pedit action may be translated to multiple flow_offload
actions.
Offload only actions that translate to a single pedit command value.

Signed-off-by: Oz Shlomo <ozsh@nvidia.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>

---
Change log:

V1 -> V2:
    - Add extack message on error
    - Assign the flow action id outside the for loop.
      Ensure the rest of the pedit actions follow the assigned id.

V2 -> V3:
    - Fix last_cmd initialization

V3 -> V4:
    - Compare all action types to the first action
---
 net/sched/act_pedit.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
index c42fcc47dd6d..35ebe5d5c261 100644
--- a/net/sched/act_pedit.c
+++ b/net/sched/act_pedit.c
@@ -545,7 +545,28 @@ static int tcf_pedit_offload_act_setup(struct tc_action *act, void *entry_data,
 		}
 		*index_inc = k;
 	} else {
-		return -EOPNOTSUPP;
+		struct flow_offload_action *fl_action = entry_data;
+		u32 cmd = tcf_pedit_cmd(act, 0);
+		int k;
+
+		switch (cmd) {
+		case TCA_PEDIT_KEY_EX_CMD_SET:
+			fl_action->id = FLOW_ACTION_MANGLE;
+			break;
+		case TCA_PEDIT_KEY_EX_CMD_ADD:
+			fl_action->id = FLOW_ACTION_ADD;
+			break;
+		default:
+			NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit command offload");
+			return -EOPNOTSUPP;
+		}
+
+		for (k = 1; k < tcf_pedit_nkeys(act); k++) {
+			if (cmd != tcf_pedit_cmd(act, k)) {
+				NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit command offload");
+				return -EOPNOTSUPP;
+			}
+		}
 	}
 
 	return 0;
-- 
1.8.3.1