net: hsr: add offloading support
Add support for offloading of HSR/PRP (IEC 62439-3) tag insertion
tag removal, duplicate generation and forwarding.
For HSR, insertion involves the switch adding a 6 byte HSR header after
the 14 byte Ethernet header. For PRP it adds a 6 byte trailer.
Tag removal involves automatically stripping the HSR/PRP header/trailer
in the switch. This is possible when the switch also performs auto
deduplication using the HSR/PRP header/trailer (making it no longer
required).
Forwarding involves automatically forwarding between redundant ports in
an HSR. This is crucial because delay is accumulated as a frame passes
through each node in the ring.
Duplication involves the switch automatically sending a single frame
from the CPU port to both redundant ports. This is required because the
inserted HSR/PRP header/trailer must contain the same sequence number
on the frames sent out both redundant ports.
Export is_hsr_master so DSA can tell them apart from other devices in
dsa_slave_changeupper.
Signed-off-by: George McCollister <george.mccollister@gmail.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/hsr/hsr_main.h b/net/hsr/hsr_main.h
index a9c30a6..a169808 100644
--- a/net/hsr/hsr_main.h
+++ b/net/hsr/hsr_main.h
@@ -13,6 +13,7 @@
#include <linux/netdevice.h>
#include <linux/list.h>
#include <linux/if_vlan.h>
+#include <linux/if_hsr.h>
/* Time constants as specified in the HSR specification (IEC-62439-3 2010)
* Table 8.
@@ -171,13 +172,6 @@ struct hsr_port {
enum hsr_port_type type;
};
-/* used by driver internally to differentiate various protocols */
-enum hsr_version {
- HSR_V0 = 0,
- HSR_V1,
- PRP_V1,
-};
-
struct hsr_frame_info;
struct hsr_node;