Ethernet Raw socket not sending with pldm payload size more than 24 bytes

[Kumar Thangavel]

Classification: Public
Hi All,

         We are working on pldm over NCSI NIC firmware update feature. We are using Raw socket to send the NCSI packets to NIC cards.
         This raw socket is working for the pldm over NCSI sensor commands. Pldm sensor commands having pldm payload as 6 bytes length only. We could see it in the tcpdump.

         The same raw socket is not working for pldm over NCSI NIC firmware update commands.
         We are facing issues if we send the pldm payload length more than 24 bytes.
         The commands are not sending with the pldm payload length of more than 24 bytes. Not sending in the TCP stack itself. That is also not captured in tcpdump.

         In the raw socket, We framed the packet like Ethernet header - 14 bytes, ncsi header - 16 bytes, pldm payload - 28 bytes.
         So, The commands are not sending if we send ethernet payload size greater than 54 bytes.

         But if we send less than 54, the commands are sending properly and got correct responses.
         We tried with ncsi netlink library also to send the commands. There also we are facing same issue.

         Could you please point us if there is any known issues or workaround for this issue.

Thanks,
Kumar.

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