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feat(PRU-ICSS): Add documentation for PTP in switch mode
Add documentation for running PTP to synchronise time between master and slave DUTs in switch mode. Signed-off-by: MD Danish Anwar <[email protected]>
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‎source/linux/Foundational_Components/PRU-ICSS/Linux_Drivers/PRU_ICSSG_Ethernet_Switch.rst‎

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@@ -166,6 +166,195 @@ To disable cut through on all queues
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devlink dev param set platform/icssg1-eth name cut_thru value 0 cmode runtime
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PTP
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"""
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PTP can be run during switch mode. To run PTP in switch mode, 3 AM64x EVMs need to be connected with middle EVM acting as the switch. Use the following ptp config file on all slave EVMs. For Master EVM, priority1 filed needs to be changed.
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.. code-block:: text
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:caption: gPTP.cfg
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# 802.1AS example configuration containing those attributes which
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# differ from the defaults. See the file, default.cfg, for the
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# complete list of available options.
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#
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[global]
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gmCapable 1
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priority1 248
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priority2 248
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logAnnounceInterval 0
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logSyncInterval -3
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syncReceiptTimeout 3
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neighborPropDelayThresh 800
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min_neighbor_prop_delay -20000000
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assume_two_step 1
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path_trace_enabled 1
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follow_up_info 1
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transportSpecific 0x1
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ptp_dst_mac 01:80:C2:00:00:0E
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network_transport L2
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delay_mechanism P2P
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ingressLatency 88
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egressLatency 288
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**Steps:**
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1. On EVM1 run below command assuming eth1 is the ICSSG interface connected and ptp2 is the device associated with it.
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.. code-block:: console
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ptp4l -P -2 -H -i eth1 -f gPTP.cfg --step_threshold=1 -m -q -p /dev/ptp2
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2. On EVM3 run below command assuming eth2 is the ICSSG interface connected and ptp2 is the device associated with it.
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.. code-block:: console
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ptp4l -P -2 -H -i eth2 -f gPTP.cfg --step_threshold=1 -m -q -p /dev/ptp2
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3. On EVM2 acting as the switch run below command assuming eth1 and eth2 are the ICSSG interfaces connected and ptp2 is the device associated with them.
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.. code-block:: console
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# Edit priority1 of EVM2 to make sure it runs as master.
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sed -i 's/priority1 248/priority1 100/g' gPTP.cfg
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# Add mdb entry for switch interface with multicast mac address used for forwarding PTP packets.
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# This address is same as ptp_dst_mac field in gPTP.cfg file.
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bridge mdb add dev br0 port br0 grp $ptp_dst_mac permanent vid 1
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# Start PTP on Master EVM
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ptp4l -P -2 -H -i eth1 -i eth2 -f gPTP.cfg --step_threshold=1 -m -q -p /dev/ptp2
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**Observed Outputs:**
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1. On EVM1
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.. code-block:: console
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root@am64xx-evm:~# cat gPTP.cfg | grep priority
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priority1 248
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priority2 248
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root@am64xx-evm:~# ptp4l -P -2 -H -i eth1 -f gPTP.cfg --step_threshold=1 -m -q -p /dev/ptp2
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ptp4l[3673.262]: selected /dev/ptp2 as PTP clock
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ptp4l[3673.296]: port 1: INITIALIZING to LISTENING on INIT_COMPLETE
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ptp4l[3673.297]: port 0: INITIALIZING to LISTENING on INIT_COMPLETE
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ptp4l[3676.325]: port 1: LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
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ptp4l[3676.325]: selected local clock 70ff76.fffe.1e2db3 as best master
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ptp4l[3676.325]: port 1: assuming the grand master role
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ptp4l[3677.050]: port 1: new foreign master 70ff76.fffe.1f3f8e-1
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ptp4l[3679.050]: selected best master clock 70ff76.fffe.1f3f8e
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ptp4l[3679.050]: port 1: MASTER to UNCALIBRATED on RS_SLAVE
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ptp4l[3679.433]: port 1: UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED
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ptp4l[3680.183]: rms 11123 max 14721 freq +9512 +/- 7654 delay 83 +/- 0
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ptp4l[3681.184]: rms 2050 max 3143 freq +2824 +/- 2781 delay 83 +/- 0
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ptp4l[3682.184]: rms 3425 max 3591 freq -3401 +/- 910 delay 83 +/- 0
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ptp4l[3683.185]: rms 2175 max 2887 freq -4622 +/- 87 delay 83 +/- 0
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ptp4l[3684.185]: rms 705 max 1163 freq -3960 +/- 252 delay 83 +/- 0
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ptp4l[3685.185]: rms 124 max 196 freq -3218 +/- 159 delay 84 +/- 0
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ptp4l[3686.186]: rms 203 max 216 freq -2865 +/- 49 delay 84 +/- 0
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ptp4l[3687.186]: rms 121 max 156 freq -2810 +/- 8 delay 84 +/- 0
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ptp4l[3688.186]: rms 39 max 64 freq -2846 +/- 13 delay 84 +/- 0
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ptp4l[3689.187]: rms 6 max 12 freq -2886 +/- 8 delay 84 +/- 0
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ptp4l[3690.187]: rms 14 max 20 freq -2910 +/- 7 delay 84 +/- 0
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ptp4l[3691.188]: rms 7 max 12 freq -2911 +/- 5 delay 84 +/- 0
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ptp4l[3692.188]: rms 5 max 9 freq -2909 +/- 6 delay 85 +/- 0
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ptp4l[3693.189]: rms 4 max 8 freq -2908 +/- 6 delay 84 +/- 0
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ptp4l[3694.189]: rms 5 max 7 freq -2907 +/- 7 delay 85 +/- 0
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ptp4l[3695.189]: rms 3 max 8 freq -2911 +/- 4 delay 84 +/- 0
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ptp4l[3696.190]: rms 4 max 8 freq -2913 +/- 5 delay 84 +/- 0
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ptp4l[3697.190]: rms 3 max 4 freq -2908 +/- 4 delay 84 +/- 0
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ptp4l[3698.191]: rms 4 max 9 freq -2908 +/- 6 delay 83 +/- 0
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ptp4l[3699.191]: rms 5 max 9 freq -2905 +/- 6 delay 83 +/- 0
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ptp4l[3700.191]: rms 5 max 9 freq -2913 +/- 5 delay 85 +/- 0
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ptp4l[3701.192]: rms 4 max 7 freq -2911 +/- 5 delay 83 +/- 0
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ptp4l[3702.192]: rms 4 max 5 freq -2908 +/- 5 delay 83 +/- 0
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ptp4l[3703.192]: rms 5 max 8 freq -2905 +/- 6 delay 84 +/- 0
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ptp4l[3704.193]: rms 6 max 8 freq -2897 +/- 3 delay 84 +/- 0
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ptp4l[3705.193]: rms 5 max 8 freq -2898 +/- 7 delay 84 +/- 0
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ptp4l[3706.193]: rms 5 max 12 freq -2904 +/- 6 delay 84 +/- 0
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ptp4l[3707.194]: rms 4 max 9 freq -2907 +/- 5 delay 85 +/- 0
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ptp4l[3708.194]: rms 3 max 6 freq -2907 +/- 4 delay 86 +/- 0
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ptp4l[3709.195]: rms 5 max 7 freq -2905 +/- 7 delay 85 +/- 0
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2. On EVM2 actings as switch
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.. code-block:: console
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root@am64xx-evm:~# cat gPTP.cfg | grep priority
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priority1 100
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priority2 248
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root@am64xx-evm:~# ptp4l -P -2 -H -i eth1 -i eth2 -f gPTP.cfg --step_threshold=1 -m -q -p /dev/ptp2
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ptp4l[3635.479]: selected /dev/ptp2 as PTP clock
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ptp4l[3635.516]: port 1: INITIALIZING to LISTENING on INIT_COMPLETE
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ptp4l[3635.548]: port 2: INITIALIZING to LISTENING on INIT_COMPLETE
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ptp4l[3635.549]: port 0: INITIALIZING to LISTENING on INIT_COMPLETE
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ptp4l[3638.522]: port 1: LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
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ptp4l[3638.522]: selected local clock 70ff76.fffe.1f3f8e as best master
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ptp4l[3638.522]: port 1: assuming the grand master role
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ptp4l[3639.278]: port 2: LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
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ptp4l[3639.278]: selected local clock 70ff76.fffe.1f3f8e as best master
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ptp4l[3639.278]: port 1: assuming the grand master role
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ptp4l[3639.278]: port 2: assuming the grand master role
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ptp4l[3660.790]: port 2: new foreign master 70ff76.fffe.1f3e6a-1
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ptp4l[3662.790]: selected best master clock 70ff76.fffe.1f3e6a
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ptp4l[3662.790]: port 1: assuming the grand master role
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ptp4l[3662.791]: port 2: assuming the grand master role
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ptp4l[3663.800]: port 1: new foreign master 70ff76.fffe.1e2db3-1
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ptp4l[3665.800]: selected best master clock 70ff76.fffe.1e2db3
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ptp4l[3665.800]: port 1: assuming the grand master role
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ptp4l[3665.800]: port 2: assuming the grand master role
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3. On EVM3
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.. code-block:: console
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root@am64xx-evm:~# cat gPTP.cfg | grep priority
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priority1 248
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priority2 248
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root@am64xx-evm:~# ptp4l -P -2 -H -i eth2 -f gPTP.cfg --step_threshold=1 -m -q -p /dev/ptp2
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ptp4l[3651.298]: selected /dev/ptp2 as PTP clock
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ptp4l[3651.336]: port 1: INITIALIZING to LISTENING on INIT_COMPLETE
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ptp4l[3651.337]: port 0: INITIALIZING to LISTENING on INIT_COMPLETE
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ptp4l[3654.775]: port 1: LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
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ptp4l[3654.775]: selected local clock 70ff76.fffe.1f3e6a as best master
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ptp4l[3654.775]: port 1: assuming the grand master role
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ptp4l[3655.266]: port 1: new foreign master 70ff76.fffe.1f3f8e-2
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ptp4l[3657.266]: selected best master clock 70ff76.fffe.1f3f8e
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ptp4l[3657.266]: port 1: MASTER to UNCALIBRATED on RS_SLAVE
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ptp4l[3657.520]: port 1: UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED
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ptp4l[3658.270]: rms 6047 max 8004 freq +5665 +/- 4160 delay 88 +/- 0
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ptp4l[3659.271]: rms 1112 max 1709 freq +2037 +/- 1510 delay 89 +/- 0
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ptp4l[3660.271]: rms 1865 max 1953 freq -1356 +/- 501 delay 89 +/- 0
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ptp4l[3661.271]: rms 1190 max 1582 freq -2032 +/- 45 delay 90 +/- 0
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ptp4l[3662.272]: rms 386 max 637 freq -1668 +/- 142 delay 89 +/- 0
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ptp4l[3663.272]: rms 71 max 111 freq -1256 +/- 89 delay 89 +/- 0
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ptp4l[3664.272]: rms 109 max 119 freq -1070 +/- 27 delay 89 +/- 0
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ptp4l[3665.273]: rms 67 max 83 freq -1037 +/- 5 delay 89 +/- 0
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ptp4l[3666.273]: rms 22 max 35 freq -1056 +/- 8 delay 89 +/- 0
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ptp4l[3667.273]: rms 6 max 11 freq -1073 +/- 8 delay 89 +/- 0
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ptp4l[3668.274]: rms 10 max 13 freq -1094 +/- 4 delay 89 +/- 0
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ptp4l[3669.274]: rms 3 max 5 freq -1090 +/- 3 delay 89 +/- 0
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ptp4l[3670.274]: rms 3 max 5 freq -1087 +/- 4 delay 89 +/- 0
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ptp4l[3671.274]: rms 5 max 7 freq -1086 +/- 6 delay 89 +/- 0
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ptp4l[3672.275]: rms 4 max 7 freq -1089 +/- 5 delay 89 +/- 0
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ptp4l[3673.275]: rms 5 max 7 freq -1087 +/- 7 delay 89 +/- 0
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ptp4l[3674.275]: rms 3 max 4 freq -1088 +/- 4 delay 88 +/- 0
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ptp4l[3675.276]: rms 4 max 8 freq -1091 +/- 5 delay 88 +/- 0
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ptp4l[3676.276]: rms 5 max 6 freq -1084 +/- 5 delay 90 +/- 0
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ptp4l[3677.276]: rms 3 max 6 freq -1085 +/- 5 delay 90 +/- 0
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ptp4l[3678.276]: rms 5 max 10 freq -1084 +/- 7 delay 90 +/- 0
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ptp4l[3679.277]: rms 4 max 9 freq -1088 +/- 5 delay 89 +/- 0
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ptp4l[3680.277]: rms 5 max 8 freq -1092 +/- 5 delay 88 +/- 0
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ptp4l[3681.277]: rms 3 max 5 freq -1089 +/- 4 delay 89 +/- 0
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ptp4l[3682.277]: rms 5 max 8 freq -1084 +/- 6 delay 88 +/- 0
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ptp4l[3683.278]: rms 4 max 7 freq -1088 +/- 6 delay 89 +/- 0
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ptp4l[3684.278]: rms 5 max 7 freq -1086 +/- 7 delay 89 +/- 0
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ptp4l[3685.278]: rms 3 max 8 freq -1087 +/- 5 delay 88 +/- 0
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ptp4l[3686.279]: rms 4 max 8 freq -1088 +/- 5 delay 88 +/- 0
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ptp4l[3687.279]: rms 4 max 8 freq -1088 +/- 5 delay 88 +/- 0
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**Results:** It can be observed that the clocks on Slave devices are getting synchronised with the clock on Master device.
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SRAM Requirement
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""""""""""""""""
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