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<div class="WordSection1">
<p class="MsoNormal">That’s expected behavior.<o:p></o:p></p>
<p class="MsoNormal">rte_mbuf_clone() doesn’t duplicate your packet data – instead<o:p></o:p></p>
<p class="MsoNormal">new mbuf just attaches to existing data packet.<o:p></o:p></p>
<p class="MsoNormal">If you need to modify one (or both) packet data after cloning –<o:p></o:p></p>
<p class="MsoNormal">you can use rte_pktmbuf_copy() instead.<o:p></o:p></p>
<p class="MsoNormal">As another alternative – have a look at examples/ip_multicast –<o:p></o:p></p>
<p class="MsoNormal">It demonstrates how to send sake packet to multiple ip destinations<o:p></o:p></p>
<p class="MsoNormal">over multiple ports without modifying the entire packet. <o:p></o:p></p>
<p class="MsoNormal">It looks that you are trying to do something quite similar.<o:p></o:p></p>
<p class="MsoNormal">Konstantin<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div style="border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt">
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> NAGENDRA BALAGANI <nagendra.balagani@oracle.com>
<br>
<b>Sent:</b> Friday, December 23, 2022 7:01 AM<br>
<b>To:</b> dev@dpdk.org<br>
<b>Cc:</b> Kapil Kumar Jain <kapil.k.jain@oracle.com><br>
<b>Subject:</b> Strange behavior with rte_pktmbuf_clone cal<o:p></o:p></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am seeing strange behavior where rte_pktmbuf_clone is not giving desired result.<o:p></o:p></p>
<p class="MsoNormal">Here is the detailed info, in my dpdk application , once I received the packet info in mbuf, I need to send the same packet to two destinations, the sequence I should follow is,
<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.5in;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">(i)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>First, Tunnel the packet to one of desired destination, so I created the shallow copy using rte_pktmbuf_clone, had another mbuf for Outer IP Header for IPinIP tunnel and sent to NIC.
<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.5in;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">(ii)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Second, I need to modify the source and destination ip addresses of the packet and send out.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The issue, I am seeing is the tunneled packet (clone) have modified IP addresses from (ii).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Code flow:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Main() <o:p></o:p></p>
<p class="MsoNormal">{<o:p></o:p></p>
<p class="MsoNormal">Struct rte_mbuf *org_mbuf; //lets assume this org_mbuf is holding the packet info.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.5in;mso-list:l2 level1 lfo4">
<![if !supportLists]><span style="mso-list:Ignore">(i)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Towards First destination.<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">Build_tunnel_packet(org_mbuf) {<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoNormal" style="margin-left:.75in;mso-list:l3 level1 lfo6">Struct rte_mbuf *clone_buffer;<o:p></o:p></li></ul>
<ul style="margin-top:0in" type="disc">
<li class="MsoNormal" style="margin-left:.75in;mso-list:l0 level1 lfo8">Allocate a clone buffer Clone_buffer
<b>= rte_pktmbuf_clone</b>(org_mbuf, clone_pool);<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoNormal" style="margin-left:.75in;mso-list:l0 level1 lfo8">Constructed IPinIP info in another mbuf and prepended in clone_buffer
<o:p></o:p></li><li class="MsoNormal" style="margin-left:.75in;mso-list:l0 level1 lfo8">Call rte_pktmbuf_tx_burst();<o:p></o:p></li></ul>
<p class="MsoNormal" style="text-indent:.5in">}<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.5in;mso-list:l2 level1 lfo4">
<![if !supportLists]><span style="mso-list:Ignore">(ii)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Towards another destination.<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">Modify_l3_and_route(org_mbuf)<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">{<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoNormal" style="margin-left:.75in;mso-list:l0 level1 lfo8">Modify L3 information of ‘org_mbuf’
<o:p></o:p></li><li class="MsoNormal" style="margin-left:.75in;mso-list:l0 level1 lfo8">and Call rte_pkt_mbuf_tx_burst();<o:p></o:p></li></ul>
<p class="MsoNormal" style="text-indent:.5in">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><img width="1016" height="413" style="width:10.5833in;height:4.302in" id="Picture_x0020_1" src="cid:image002.jpg@01D916EA.D92B9250"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In the above screenshot, the packet 37 should tunneled as it is by adding the outer ip layer(i.e 182.16.146.*), but the inner L3 information also getting changed (which I am modifying in the second step) for some packets.
<o:p></o:p></p>
<p class="MsoNormal">Using, rte_pktmbuf_copy(), solving the issue, but in expense of extra mbuf.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please, help me in understanding what is wrong in the case of rte_pktmbuf_clone()?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<br>
Nagendra<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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