Hi,
I have a setup with TI processor using the cpsw driver from Linux
mainline, kernel version 5.4. I'm using IEEE 802.3 network transport and
sending PTP frames on Ethernet. When sending SYNC, FOLLOW_UP and
DELAY_REQ that has a length of 58 bytes they get padded up to 64 bytes.
When receiving FOLLOW_UP and DELAY_REQ in linuxptp they are dropped with
message "bad message" because the stack treats the padding as a TLV
entry (suffix_post_recv in msg.c returns 4) and the pdulen and
messageLength mismatch.
IEEE 802.3 minimum PDU size is 64 bytes. PTP messages SYNC, FOLLOW_UP
and DELAY_REQ is smaller than that, 58 bytes. Are there any spec telling
how to send PTP messages smaller than 64 bytes on Ethernet?
On the other side in my setup I have a PC with e1000e driver. On that
side when sending SYNC, FOLLOW_UP and DELAY_REQ over Ethernet the PDUs
are padded to 60 bytes. Also tested a NXP processor (i.Mx8mp) and that
one also padded to 60 bytes. A slightly different approach that is
working with linuxptp. Is my issue with the TI processor a driver issue
with the cpsw driver in Linux?
Thanks,
/Peter
_______________________________________________
Linuxptp-users mailing list
Linuxptp-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linuxptp-users
