On Sunday, 1 November 2020, 12:10:08 CET, Vladimir Oltean wrote:

On Sun, Nov 01, 2020 at 10:35:01AM +0100, Christian Eggers wrote:

quoted

Hi Vladimir,

On Friday, 30 October 2020, 19:24:47 CET, Vladimir Oltean wrote:

quoted

On Thu, Oct 22, 2020 at 12:17:48PM +0200, Christian Eggers wrote:

quoted

I tried to study the effect of setting the ocmode bit on the KSZ
either to
master or to slave. The main visible change is, that some PTP message
types
are be filtered out on RX:
- in "master" mode, "Sync" messages from other nodes will not be
received
(but everything else like "Announce" seem to work)
- in "slave" mode, "Delay_Req" messages from other nodes will not be
received

Could you dump the contents of your REG_PTP_MSG_CONF2 register?

runtime register value is 0x1004 (matches default value from the data
sheet). The Linux driver doesn't touch this register. Below is a dump of
all PTP related (global) registers.

So the bit 5 ("Enable Dropping of Sync/Follow_Up and Delay_Req PTP
Messages") is not set. When the PTP messages are dropped, do you know
which error counter in ethtool -S is increasing?

I am not sure whether I understand the question. My assumption is that the
KSZ9563 simply doesn't forward specific PTP packages from the slave ports to 
the CPU port. In my imagination this happens in hardware and is not visible in
software.

I have run "ethtool -S" two times on the PTP master clock (E2E mode):
- When "ocmode" is set to master (DelayReq messages can be received)
- When "ocmode" is set to slave (DelayReq messages cannot be received)

Here is the diff output:

--- /home/root/ethtool1
+++ /home/root/ethtool2

@@ -1,8 +1,8 @@
 NIC statistics:
-     tx_packets: 1421
-     tx_bytes: 133641
-     rx_packets: 488
-     rx_bytes: 35904
+     tx_packets: 1455
+     tx_bytes: 136783
+     rx_packets: 496
+     rx_bytes: 36459
      rx_hi: 0
      rx_undersize: 0
      rx_fragments: 0

@@ -14,10 +14,10 @@
      rx_mac_ctrl: 0
      rx_pause: 0
      rx_bcast: 4
-     rx_mcast: 667
+     rx_mcast: 683
      rx_ucast: 0
      rx_64_or_less: 0
-     rx_65_127: 659
+     rx_65_127: 675
      rx_128_255: 11
      rx_256_511: 1
      rx_512_1023: 0

@@ -27,15 +27,15 @@
      tx_hi: 0
      tx_late_col: 0
      tx_pause: 0
-     tx_bcast: 713
-     tx_mcast: 1852
-     tx_ucast: 324
+     tx_bcast: 733
+     tx_mcast: 1897
+     tx_ucast: 333
      tx_deferred: 0
      tx_total_col: 0
      tx_exc_col: 0
      tx_single_col: 0
      tx_mult_col: 0
-     rx_total: 61158
-     tx_total: 307225
+     rx_total: 62577
+     tx_total: 313773
      rx_discards: 20
      tx_discards: 0

regards
Christian