bnxt_en: check for ingress qdisc in flower offload

Check for ingress-only qdisc for flower offload, as other qdiscs
are not supported for flower offload.
Suggested-by: NJiri Pirko <jiri@resnulli.us>
Signed-off-by: NSathya Perla <sathya.perla@broadcom.com>
Reviewed-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c

@@ -750,6 +750,10 @@ int bnxt_tc_setup_flower(struct bnxt *bp, u16 src_fid,
 {
 	int rc = 0;
 
+	if (!is_classid_clsact_ingress(cls_flower->common.classid) ||
+	    cls_flower->common.chain_index)
+		return -EOPNOTSUPP;
+
 	switch (cls_flower->command) {
 	case TC_CLSFLOWER_REPLACE:
 		rc = bnxt_tc_add_flow(bp, src_fid, cls_flower);