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From: Kumar Thangavel <thangavel.k@hcl.com>
To: "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Subject: Ethernet Raw socket not sending with pldm payload size more than 24
 bytes
Thread-Topic: Ethernet Raw socket not sending with pldm payload size more than
 24 bytes
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Date: Thu, 18 Mar 2021 06:41:48 +0000
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Classification: Public
Hi All,

         We are working on pldm over NCSI NIC firmware update feature. We a=
re 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 captur=
ed 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. Ther=
e also we are facing same issue.

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

Thanks,
Kumar.

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<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">Classification: <b><s=
pan style=3D"color:green">Public</span></b><span style=3D"font-size:12.0pt"=
><o:p></o:p></span></p>
<p class=3D"MsoNormal">Hi All,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; We =
are working on pldm over NCSI NIC firmware update feature. We are using Raw=
 socket to send the NCSI packets to NIC cards.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;Thi=
s 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 th=
e tcpdump.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The=
 same raw socket is not working for pldm over NCSI NIC firmware update comm=
ands.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;We are facing issues if we send the pldm payload length more than 24 byte=
s.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;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 t=
cpdump.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; In =
the raw socket, We framed the packet like Ethernet header &#8211; 14 bytes,=
 ncsi header &#8211; 16 bytes, pldm payload &#8211; 28 bytes.<o:p></o:p></p=
>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;So,=
 The commands are not sending if we send ethernet payload size greater than=
 54 bytes.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; But=
 if we send less than 54, the commands are sending properly and got correct=
 responses.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;We tried with ncsi netlink library also to send the commands. There also =
we are facing same issue.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Cou=
ld you please point us if there is any known issues or workaround for this =
issue.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal">Kumar.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <o:=
p></o:p></p>
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tents (with or without referred errors) shall therefore not attach any liab=
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 those of the author and may not necessarily reflect the views or opinions =
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 disclosure, modification, distribution and / or publication of this messag=
e without the prior written consent
 of authorized representative of HCL is strictly prohibited. If you have re=
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