linux sja1105 bridge mode causes PTP L2 layer data to lose timestamps

[hjk003]

Hi, NXP team. When using a SoC (imx8mp-evk) + Switch (SJA1105) architecture, setting the network bridge mode causes PTP L2 layer data to lose timestamps.
This is our architecture:

        ┌──────────────────────────────┐
        │                              │
        │                              │
        │                              │
        │                              │
        │                              │
        │                  ┌───────────┴───────────────┐
        │                  │         SPI               │
  ┌─────▼─────────┐        │                           │
  │   SPI         │        │                           │
  │ port0         │        │M                          │
  │ port1    port2◄────────┤A                          │
  │    SJA1105    │        │C                          │
  │               │        │1       CPU                │
  │ port3         │        │   MIMX8ML8DVNLZAB         │
  │ port4         │        │                           │
  │               │        │                           │
  └─────── ───────┘        │                           │
                           │        MAC2               │
                           └──────────┬────────────────┘
                                      │
                                      │
                                      │
┌───────── ────────┐                  │
│       RGMII      │                  │
│                  │                  │
│   PHY            │                  │
│   88E1512       M│                  │
│                 D◄──────────────────┘
│                 I│
│                 O│
│                  │
└───────┬──────────┘
        │
        │
        │
        │
        │
        │
        │
        │
        │
        └► OUT

Ports 1 through 4 are each connected to a SoC device.

Linux system configuration

br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.16.2.100  netmask 255.255.255.0  broadcast 172.16.2.255
        inet6 fe80::d053:57ff:feb1:df50  prefixlen 64  scopeid 0x20<link>
        ether d2:53:57:b1:df:50  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 12  bytes 984 (984.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

end0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.2.100  netmask 255.255.255.0  broadcast 192.168.2.255
        inet6 fe80::3065:76ff:feed:96cb  prefixlen 64  scopeid 0x20<link>
        ether 32:65:76:ed:96:cb  txqueuelen 1000  (Ethernet)
        RX packets 2  bytes 132 (132.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 49  bytes 2434 (2.4 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

end1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1504
        inet6 fe80::7c32:f0ff:fefb:c940  prefixlen 64  scopeid 0x20<link>
        ether 7e:32:f0:fb:c9:40  txqueuelen 1000  (Ethernet)
        RX packets 58  bytes 7130 (7.1 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 22  bytes 1828 (1.8 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 210

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 130  bytes 9914 (9.9 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 130  bytes 9914 (9.9 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

swp1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 7e:32:f0:fb:c9:40  txqueuelen 1000  (Ethernet)
        RX packets 58  bytes 6898 (6.8 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

swp2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 7e:32:f0:fb:c9:40  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

swp3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 7e:32:f0:fb:c9:40  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

swp4: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 7e:32:f0:fb:c9:40  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 12  bytes 984 (984.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

root@hawaii-gen2:~# ptp4l -f linux_ptp_bc.conf -m && phc2sys -a -r -m
ptp4l[149.643]: selected /dev/ptp0 as PTP clock
ptp4l[149.645]: port 2 (swp1): just a bunch of devices
ptp4l[149.645]: port 3 (swp2): just a bunch of devices
ptp4l[149.645]: port 4 (swp3): just a bunch of devices
ptp4l[149.645]: port 5 (swp4): just a bunch of devices
ptp4l[149.680]: port 1 (end0): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[149.717]: port 2 (swp1): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[149.753]: port 3 (swp2): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[149.785]: port 4 (swp3): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[149.817]: port 5 (swp4): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[149.817]: port 0 (/var/run/ptp4l): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[149.817]: port 0 (/var/run/ptp4lro): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[150.545]: port 1 (end0): new foreign master 0080ee.fffe.60f9b8-1
ptp4l[154.561]: selected best master clock 0080ee.fffe.60f9b8
ptp4l[154.561]: port 1 (end0): LISTENING to UNCALIBRATED on RS_SLAVE
ptp4l[154.561]: Switched to /dev/ptp0 as PTP clock
ptp4l[155.360]: port 1 (end0): minimum delay request interval 2^-3
ptp4l[156.258]: port 3 (swp2): LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
ptp4l[156.292]: port 4 (swp3): LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
ptp4l[156.452]: port 5 (swp4): LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
ptp4l[156.569]: master offset -1766736492136248875 s0 freq      -0 path delay      1150
ptp4l[156.612]: port 2 (swp1): LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
ptp4l[157.261]: port 2 (swp1): received DELAY_REQ without timestamp
ptp4l[157.262]: port 4 (swp3): received DELAY_REQ without timestamp
ptp4l[157.262]: port 5 (swp4): received DELAY_REQ without timestamp
ptp4l[157.295]: port 2 (swp1): received DELAY_REQ without timestamp
ptp4l[157.295]: port 3 (swp2): received DELAY_REQ without timestamp
ptp4l[157.295]: port 5 (swp4): received DELAY_REQ without timestamp
ptp4l[157.455]: port 2 (swp1): received DELAY_REQ without timestamp
ptp4l[157.455]: port 3 (swp2): received DELAY_REQ without timestamp
ptp4l[157.455]: port 4 (swp3): received DELAY_REQ without timestamp
ptp4l[157.573]: master offset -1766736492136230812 s1 freq  +17991 path delay      -718
ptp4l[157.614]: port 3 (swp2): received DELAY_REQ without timestamp
ptp4l[157.615]: port 4 (swp3): received DELAY_REQ without timestamp
ptp4l[157.615]: port 5 (swp4): received DELAY_REQ without timestamp
ptp4l[158.262]: port 2 (swp1): received DELAY_REQ without timestamp
ptp4l[158.262]: port 4 (swp3): received DELAY_REQ without timestamp
ptp4l[158.262]: port 5 (swp4): received DELAY_REQ without timestamp
ptp4l[158.295]: port 2 (swp1): received DELAY_REQ without timestamp
ptp4l[158.296]: port 3 (swp2): received DELAY_REQ without timestamp
ptp4l[158.296]: port 5 (swp4): received DELAY_REQ without timestamp
ptp4l[158.455]: port 2 (swp1): received DELAY_REQ without timestamp
ptp4l[158.455]: port 3 (swp2): received DELAY_REQ without timestamp
ptp4l[158.455]: port 4 (swp3): received DELAY_REQ without timestamp
ptp4l[158.577]: master offset      -1848 s2 freq  +16143 path delay      -718
ptp4l[158.577]: port 1 (end0): UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED

[Zhiming_Liu]

Hi @hjk003 

你使用的内核版本是什么？这里的MAC1 和MAC2分别是哪个网口？

请使用ethtool -T swp1来查看它已经启用的功能。然后确保/dev/ptp0是你真正需要的接口。

Best Regards,
Zhiming