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net: hsr: add offloading support

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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>
This commit is contained in:
George McCollister 2021-02-09 19:02:11 -06:00 • committed by David S. Miller
parent 78be9217c4
commit dcf0cd1cc5
12 changed files with 109 additions and 26 deletions
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9
include/linux/netdev_features.h
View file

@ -86,6 +86,11 @@ enum {
NETIF_F_HW_MACSEC_BIT, /* Offload MACsec operations */
NETIF_F_GRO_UDP_FWD_BIT, /* Allow UDP GRO for forwarding */
NETIF_F_HW_HSR_TAG_INS_BIT, /* Offload HSR tag insertion */
NETIF_F_HW_HSR_TAG_RM_BIT, /* Offload HSR tag removal */
NETIF_F_HW_HSR_FWD_BIT, /* Offload HSR forwarding */
NETIF_F_HW_HSR_DUP_BIT, /* Offload HSR duplication */
/*
* Add your fresh new feature above and remember to update
* netdev_features_strings[] in net/core/ethtool.c and maybe
@ -159,6 +164,10 @@ enum {
#define NETIF_F_GSO_FRAGLIST __NETIF_F(GSO_FRAGLIST)
#define NETIF_F_HW_MACSEC __NETIF_F(HW_MACSEC)
#define NETIF_F_GRO_UDP_FWD __NETIF_F(GRO_UDP_FWD)
#define NETIF_F_HW_HSR_TAG_INS __NETIF_F(HW_HSR_TAG_INS)
#define NETIF_F_HW_HSR_TAG_RM __NETIF_F(HW_HSR_TAG_RM)
#define NETIF_F_HW_HSR_FWD __NETIF_F(HW_HSR_FWD)
#define NETIF_F_HW_HSR_DUP __NETIF_F(HW_HSR_DUP)
/* Finds the next feature with the highest number of the range of start till 0.
*/