In order to support this, we are creating a make-shift switch tag out of a VLAN trunk configured on the CPU port. Termination of normal traffic on switch ports only works when not under a vlan_filtering bridge. Termination of management (PTP, BPDU) traffic works under all circumstances because it uses a different tagging mechanism (incl_srcpt). We are making use of the generic CONFIG_NET_DSA_TAG_8021Q code and leveraging it from our own CONFIG_NET_DSA_TAG_SJA1105. There are two types of traffic: regular and link-local. The link-local traffic received on the CPU port is trapped from the switch's regular forwarding decisions because it matched one of the two DMAC filters for management traffic. On transmission, the switch requires special massaging for these link-local frames. Due to a weird implementation of the switching IP, by default it drops link-local frames that originate on the CPU port. It needs to be told where to forward them to, through an SPI command ("management route") that is valid for only a single frame. So when we're sending link-local traffic, we are using the dsa_defer_xmit mechanism.
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| 2 | * Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com> | 2 | * Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com> |
| 3 | */ | 3 | */ |
| 4 | 4 | ||
| 5 | /* Included by drivers/net/dsa/sja1105/sja1105.h */ | 5 | /* Included by drivers/net/dsa/sja1105/sja1105.h and net/dsa/tag_sja1105.c */ |
| 6 | 6 | ||
| 7 | #ifndef _NET_DSA_SJA1105_H | 7 | #ifndef _NET_DSA_SJA1105_H |
| 8 | #define _NET_DSA_SJA1105_H | 8 | #define _NET_DSA_SJA1105_H |
| 9 | 9 | ||
| 10 | #include <linux/skbuff.h> | ||
| 10 | #include <linux/etherdevice.h> | 11 | #include <linux/etherdevice.h> |
| 12 | #include <net/dsa.h> | ||
| 11 | 13 | ||
| 12 | #define ETH_P_SJA1105 ETH_P_DSA_8021Q | 14 | #define ETH_P_SJA1105 ETH_P_DSA_8021Q |
| 13 | 15 | ||
| 14 | /* The switch can only be convinced to stay in unmanaged mode and not trap any | 16 | /* IEEE 802.3 Annex 57A: Slow Protocols PDUs (01:80:C2:xx:xx:xx) */ |
| 15 | * link-local traffic by actually telling it to filter frames sent at the | 17 | #define SJA1105_LINKLOCAL_FILTER_A 0x0180C2000000ull |
| 16 | * 00:00:00:00:00:00 destination MAC. | 18 | #define SJA1105_LINKLOCAL_FILTER_A_MASK 0xFFFFFF000000ull |
| 17 | */ | 19 | /* IEEE 1588 Annex F: Transport of PTP over Ethernet (01:1B:19:xx:xx:xx) */ |
| 18 | #define SJA1105_LINKLOCAL_FILTER_A 0x000000000000ull | 20 | #define SJA1105_LINKLOCAL_FILTER_B 0x011B19000000ull |
| 19 | #define SJA1105_LINKLOCAL_FILTER_A_MASK 0xFFFFFFFFFFFFull | 21 | #define SJA1105_LINKLOCAL_FILTER_B_MASK 0xFFFFFF000000ull |
| 20 | #define SJA1105_LINKLOCAL_FILTER_B 0x000000000000ull | 22 | |
| 21 | #define SJA1105_LINKLOCAL_FILTER_B_MASK 0xFFFFFFFFFFFFull | 23 | enum sja1105_frame_type { |
| 24 | SJA1105_FRAME_TYPE_NORMAL = 0, | ||
| 25 | SJA1105_FRAME_TYPE_LINK_LOCAL, | ||
| 26 | }; | ||
| 27 | |||
| 28 | struct sja1105_skb_cb { | ||
| 29 | enum sja1105_frame_type type; | ||
| 30 | }; | ||
| 31 | |||
| 32 | #define SJA1105_SKB_CB(skb) \ | ||
| 33 | ((struct sja1105_skb_cb *)DSA_SKB_CB_PRIV(skb)) | ||
| 34 | |||
| 35 | struct sja1105_port { | ||
| 36 | struct dsa_port *dp; | ||
| 37 | int mgmt_slot; | ||
| 38 | }; | ||
| 22 | 39 | ||
| 23 | #endif /* _NET_DSA_SJA1105_H */ | 40 | #endif /* _NET_DSA_SJA1105_H */ |