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<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Enviroment information;<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">DPDK versiyon 17.05<o:p></o:p></p>
<p class="MsoNormal">Kernel version 4.4.0<o:p></o:p></p>
<p class="MsoNormal">OS – Ubuntu 16.05<o:p></o:p></p>
<p class="MsoNormal">INTEL NIC XL710 <o:p></o:p></p>
<p class="MsoNormal">Last i40e driver and NVM is installed.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas;color:black;background:white">ethtool -k ens2f2 :<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:15.0pt;background:white;vertical-align:baseline">
<span style="font-size:10.5pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:TR">tx-checksumming: on</span><span style="font-size:10.5pt;font-family:Consolas;color:#333333;mso-fareast-language:TR"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:15.0pt;background:white;vertical-align:baseline">
<span style="font-size:10.5pt;font-family:Consolas;color:#333333;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:TR"> </span><span style="font-size:10.5pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:TR">tx-checksum-ipv4:
on</span><span style="font-size:10.5pt;font-family:Consolas;color:#333333;mso-fareast-language:TR"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:15.0pt;background:white;vertical-align:baseline">
<span style="font-size:10.5pt;font-family:Consolas;color:#333333;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:TR"> </span><span style="font-size:10.5pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:TR">tx-checksum-ip-generic:
off [fixed]</span><span style="font-size:10.5pt;font-family:Consolas;color:#333333;mso-fareast-language:TR"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:15.0pt;background:white;vertical-align:baseline">
<span style="font-size:10.5pt;font-family:Consolas;color:#333333;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:TR"> </span><span style="font-size:10.5pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:TR">tx-checksum-ipv6:
on</span><span style="font-size:10.5pt;font-family:Consolas;color:#333333;mso-fareast-language:TR"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:15.0pt;background:white;vertical-align:baseline">
<span style="font-size:10.5pt;font-family:Consolas;color:#333333;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:TR"> </span><span style="font-size:10.5pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:TR">tx-checksum-fcoe-crc:
off [fixed]</span><span style="font-size:10.5pt;font-family:Consolas;color:#333333;mso-fareast-language:TR"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:15.0pt;background:white;vertical-align:baseline">
<span style="font-size:10.5pt;font-family:Consolas;color:#333333;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:TR"> </span><span style="font-size:10.5pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:TR">tx-checksum-sctp:
on</span><span style="font-size:10.5pt;font-family:Consolas;color:#333333;mso-fareast-language:TR"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:15.0pt;background:white;vertical-align:baseline">
<span style="font-size:10.5pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:TR">rx-fcs: off [fixed]</span><span style="font-size:10.5pt;font-family:Consolas;color:#333333;mso-fareast-language:TR"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:15.0pt;background:white;vertical-align:baseline">
<span style="font-size:10.5pt;font-family:Consolas;color:black;border:none windowtext 1.0pt;padding:0cm;mso-fareast-language:TR">rx-all: off [fixed]</span><span style="font-size:10.5pt;font-family:Consolas;color:#333333;mso-fareast-language:TR"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What is CRC or FCS :<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="https://www.firewall.cx/networking-topics/ethernet/ethernet-frame-formats/201-ethernet-ii.html">https://www.firewall.cx/networking-topics/ethernet/ethernet-frame-formats/201-ethernet-ii.html</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">State:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">Even if strip_crc flag is up in port_config, NIC doesnt strip CRC.
<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">After stripping Ethernet Header from message-buf, CRC still there. So it breaks fragmentation when specific byte length income. For Example; Message with IP header -> 1480, Ether
Header 6+6+2 = 14 byte. Frame length looks 1498 byte. Looks like 4 byte Crc, it has. After Ether header is stripped , 1488 byte left.
<o:p></o:p></li></ul>
<p class="MsoNormal">[code]<o:p></o:p></p>
<p class="MsoNormal">static struct rte_eth_conf port_conf = {<o:p></o:p></p>
<p class="MsoNormal"> .rxmode =<o:p></o:p></p>
<p class="MsoNormal"> {<o:p></o:p></p>
<p class="MsoNormal"> .header_split = 0, /* Header Split disabled */<o:p></o:p></p>
<p class="MsoNormal"> .hw_ip_checksum = 0, /* IP checksum offload disabled */<o:p></o:p></p>
<p class="MsoNormal"> .hw_vlan_filter = 0, /* VLAN filtering disabled */<o:p></o:p></p>
<p class="MsoNormal"> .jumbo_frame = 0, /* Jumbo Frame Support disabled */<o:p></o:p></p>
<p class="MsoNormal"> .hw_strip_crc = 1, /* CRC stripped by hardware */<o:p></o:p></p>
<p class="MsoNormal"> },<o:p></o:p></p>
<p class="MsoNormal"> .txmode =<o:p></o:p></p>
<p class="MsoNormal"> {<o:p></o:p></p>
<p class="MsoNormal"> .mq_mode = ETH_MQ_TX_NONE,<o:p></o:p></p>
<p class="MsoNormal"> },<o:p></o:p></p>
<p class="MsoNormal">};<o:p></o:p></p>
<p class="MsoNormal">[/code]<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is there any function to strip CRC bytes or what is best way? Big thanks to help.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have an idea that,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">After stripping Ethernet Header ,<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">If total length of message is bigger than IP header length , there is a CRC,
<u>it needs to strip somehow?</u><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">If total length of message is equal to IP header length, no problem.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">If total length of message is less than IP header length, message is broken.<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best Regards.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:TR">___<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:TR">Yasin CANER<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:TR">Lider Mühendis<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:TR">Ulak Haberleşme A.Ş. Ankara<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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