net: hsrprp: allow HSR to forward PRP frames

Per IEC62439, there is no limitation on PRP frames being sent on HSR port.
This change adds a check when detecting frame type to only mark frames
as PRP frames if they carry a PRP RCT and PRP is the protocol for the
active port. So now PRP frames being forwarded through an HSR port
should be detected as standard type frames and be forwarded
successfully. e.g. Sending a PRP tagged frame out an HSR port should
result in successful transmit, where resulting frame carries both HSR
and PRP tags.

Signed-off-by: Aaron Kramer <a-kramer@ti.com>

net/hsr-prp/hsr_prp_forward.c

@@ -738,7 +738,8 @@ static int fill_frame_info(struct hsr_prp_frame_info *frame,
 		struct prp_rct *rct = skb_get_PRP_rct(skb);
 
 		if (rct &&
-		    prp_check_lsdu_size(skb, rct, frame->is_supervision)) {
+		    prp_check_lsdu_size(skb, rct, frame->is_supervision) &&
+					port->priv->prot_version == PRP_V1) {
 			frame->skb_hsr = NULL;
 			frame->skb_std = NULL;
 			frame->skb_prp = skb;