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<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 lfo1">
<![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 lfo1">
<![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 lfo2">
<![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>
<p class="MsoNormal" style="margin-left:1.25in;text-indent:-.25in;mso-list:l3 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Struct rte_mbuf *clone_buffer;<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.25in;text-indent:-.25in;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Allocate a clone buffer Clone_buffer <b>= rte_pktmbuf_clone</b>(org_mbuf, clone_pool);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:1.25in;text-indent:-.25in;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Constructed IPinIP info in another mbuf and prepended in clone_buffer
<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.25in;text-indent:-.25in;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Call rte_pktmbuf_tx_burst();<o:p></o:p></p>
<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 lfo2">
<![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>
<p class="MsoNormal" style="margin-left:1.25in;text-indent:-.25in;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Modify L3 information of ‘org_mbuf’ <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.25in;text-indent:-.25in;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>and Call rte_pkt_mbuf_tx_burst();<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>
<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:4.3055in" id="Picture_x0020_1" src="cid:image001.jpg@01D916CA.5B7CCA10"><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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