net/hsr: Added support for HSR v1

This patch adds support for the newer version 1 of the HSR
networking standard. Version 0 is still default and the new
version has to be selected via iproute2.

Main changes are in the supervision frame handling and its
ethertype field.

Signed-off-by: Peter Heise <peter.heise@airbus.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 32 insertions, 11 deletions

diff --git a/net/hsr/hsr_forward.c b/net/hsr/hsr_forward.c
index 7871ed6d3825..5ee1d43f1310 100644
--- a/net/hsr/hsr_forward.c
+++ b/net/hsr/hsr_forward.c
@@ -50,21 +50,40 @@ struct hsr_frame_info {
  */
 static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb)
 {
-	struct hsr_ethhdr_sp *hdr;
+	struct ethhdr *ethHdr;
+	struct hsr_sup_tag *hsrSupTag;
+	struct hsrv1_ethhdr_sp *hsrV1Hdr;
 
 	WARN_ON_ONCE(!skb_mac_header_was_set(skb));
-	hdr = (struct hsr_ethhdr_sp *) skb_mac_header(skb);
+	ethHdr = (struct ethhdr *) skb_mac_header(skb);
 
-	if (!ether_addr_equal(hdr->ethhdr.h_dest,
+	/* Correct addr? */
+	if (!ether_addr_equal(ethHdr->h_dest,
 			      hsr->sup_multicast_addr))
 		return false;
 
-	if (get_hsr_stag_path(&hdr->hsr_sup) != 0x0f)
+	/* Correct ether type?. */
+	if (!(ethHdr->h_proto == htons(ETH_P_PRP)
+			|| ethHdr->h_proto == htons(ETH_P_HSR)))
 		return false;
-	if ((hdr->hsr_sup.HSR_TLV_Type != HSR_TLV_ANNOUNCE) &&
-	    (hdr->hsr_sup.HSR_TLV_Type != HSR_TLV_LIFE_CHECK))
+
+	/* Get the supervision header from correct location. */
+	if (ethHdr->h_proto == htons(ETH_P_HSR)) { /* Okay HSRv1. */
+		hsrV1Hdr = (struct hsrv1_ethhdr_sp *) skb_mac_header(skb);
+		if (hsrV1Hdr->hsr.encap_proto != htons(ETH_P_PRP))
+			return false;
+
+		hsrSupTag = &hsrV1Hdr->hsr_sup;
+	} else {
+		hsrSupTag = &((struct hsrv0_ethhdr_sp *) skb_mac_header(skb))->hsr_sup;
+	}
+
+	if ((hsrSupTag->HSR_TLV_Type != HSR_TLV_ANNOUNCE) &&
+	    (hsrSupTag->HSR_TLV_Type != HSR_TLV_LIFE_CHECK))
 		return false;
-	if (hdr->hsr_sup.HSR_TLV_Length != 12)
+	if ((hsrSupTag->HSR_TLV_Length != 12) &&
+			(hsrSupTag->HSR_TLV_Length !=
+					sizeof(struct hsr_sup_payload)))
 		return false;
 
 	return true;
@@ -110,7 +129,7 @@ static struct sk_buff *frame_get_stripped_skb(struct hsr_frame_info *frame,
 
 
 static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame,
-			 struct hsr_port *port)
+			 struct hsr_port *port, u8 protoVersion)
 {
 	struct hsr_ethhdr *hsr_ethhdr;
 	int lane_id;
@@ -131,7 +150,8 @@ static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame,
 	set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, lsdu_size);
 	hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr);
 	hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto;
-	hsr_ethhdr->ethhdr.h_proto = htons(ETH_P_PRP);
+	hsr_ethhdr->ethhdr.h_proto = htons(protoVersion ?
+			ETH_P_HSR : ETH_P_PRP);
 }
 
 static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o,
@@ -160,7 +180,7 @@ static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o,
 	memmove(dst, src, movelen);
 	skb_reset_mac_header(skb);
 
-	hsr_fill_tag(skb, frame, port);
+	hsr_fill_tag(skb, frame, port, port->hsr->protVersion);
 
 	return skb;
 }
@@ -320,7 +340,8 @@ static int hsr_fill_frame_info(struct hsr_frame_info *frame,
 		/* FIXME: */
 		WARN_ONCE(1, "HSR: VLAN not yet supported");
 	}
-	if (ethhdr->h_proto == htons(ETH_P_PRP)) {
+	if (ethhdr->h_proto == htons(ETH_P_PRP)
+			|| ethhdr->h_proto == htons(ETH_P_HSR)) {
 		frame->skb_std = NULL;
 		frame->skb_hsr = skb;
 		frame->sequence_nr = hsr_get_skb_sequence_nr(skb);