net: sched: flower: only return error from hw offload if skip_sw

Recently introduced tc_setup_flow_action() can fail when parsing tcf_exts
on some unsupported action commands. However, this should not affect the
case when user did not explicitly request hw offload by setting skip_sw
flag. Modify tc_setup_flow_action() callers to only propagate the error if
skip_sw flag is set for filter that is being offloaded, and set extack
error message in that case.
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Fixes: 3a7b6861 ("cls_api: add translator to flow_action representation")
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/cls_flower.c

@@ -396,8 +396,12 @@ static int fl_hw_replace_filter(struct tcf_proto *tp,
 	err = tc_setup_flow_action(&cls_flower.rule->action, &f->exts);
 	if (err) {
 		kfree(cls_flower.rule);
+		if (skip_sw) {
+			NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action");
 			return err;
 		}
+		return 0;
+	}
 
 	err = tc_setup_cb_call(block, TC_SETUP_CLSFLOWER, &cls_flower, skip_sw);
 	kfree(cls_flower.rule);
@@ -1503,8 +1507,12 @@ static int fl_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb,
 						   &f->exts);
 			if (err) {
 				kfree(cls_flower.rule);
+				if (tc_skip_sw(f->flags)) {
+					NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action");
 					return err;
 				}
+				continue;
+			}
 
 			cls_flower.classid = f->res.classid;