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linux-stable/include/linux/if_hsr.h

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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>
2021-02-10 01:02:11 +00:00
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_IF_HSR_H_
#define _LINUX_IF_HSR_H_
/* used to differentiate various protocols */
enum hsr_version {
HSR_V0 = 0,
HSR_V1,
PRP_V1,
};
flow_dissector: Add support for HSR Network drivers such as igb or igc call eth_get_headlen() to determine the header length for their to be constructed skbs in receive path. When running HSR on top of these drivers, it results in triggering BUG_ON() in skb_pull(). The reason is the skb headlen is not sufficient for HSR to work correctly. skb_pull() notices that. For instance, eth_get_headlen() returns 14 bytes for TCP traffic over HSR which is not correct. The problem is, the flow dissection code does not take HSR into account. Therefore, add support for it. Reported-by: Anthony Harivel <anthony.harivel@linutronix.de> Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de> Link: https://lore.kernel.org/r/20220228195856.88187-1-kurt@linutronix.de Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-02-28 19:58:56 +00:00
/* HSR Tag.
* As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,
* path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest,
* h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr,
* encapsulated protocol } instead.
*
* Field names as defined in the IEC:2010 standard for HSR.
*/
struct hsr_tag {
__be16 path_and_LSDU_size;
__be16 sequence_nr;
__be16 encap_proto;
} __packed;
#define HSR_HLEN 6
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>
2021-02-10 01:02:11 +00:00
#if IS_ENABLED(CONFIG_HSR)
extern bool is_hsr_master(struct net_device *dev);
extern int hsr_get_version(struct net_device *dev, enum hsr_version *ver);
#else
static inline bool is_hsr_master(struct net_device *dev)
{
return false;
}
static inline int hsr_get_version(struct net_device *dev,
enum hsr_version *ver)
{
return -EINVAL;
}
#endif /* CONFIG_HSR */
#endif /*_LINUX_IF_HSR_H_*/
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