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Wed, 12 Apr 2017 17:48:10 +0000 From: Angela Czubak To: dts@dpdk.org Message-ID: Date: Wed, 12 Apr 2017 19:48:00 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [31.172.191.173] X-ClientProxiedBy: AM5P189CA0017.EURP189.PROD.OUTLOOK.COM (10.161.53.30) To SN2PR0701MB813.namprd07.prod.outlook.com (10.160.16.147) X-MS-Office365-Filtering-Correlation-Id: d24aaf12-6cc2-434d-2e4b-08d481cc15d2 X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:(22001)(201703131423075)(201703031133081); SRVR:SN2PR0701MB813; X-Microsoft-Exchange-Diagnostics: 1; SN2PR0701MB813; 3:Cm207NMiBeNR6gZWJo/ukGPsb7Z7U4KYOtFSO9i/WXkzyvgnXwdotZpj8BhrSBM9d49L2CzfJrTPTWQDWpSurg3PuZuqYnyctaa9BzvYz0odKipwkZHRY5FwGQDARo+IofVP68jsAQ5PfgOsUc4+6/BntpgnTpqRLxBTZU+pym10P0gPM+AWzFLEgLSoGcB1tiut62X39yqx6FFjS22kTNd4i6AelRBFna52gyzzMUGDn+Sqv8sW0hC2zSCyyOz19+Uw/InNTBqO2cfiuBxXGzDFwAz4q1gcVmb1uNsE2hZ87RXJbDC1/48/fJaeI2oFdu3SSc/BOB/XAfUjsxSOyA==; 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First of all, what are the expectations when it comes to max-pkt-len? I mean, self.dut.send_expect("port config all max-pkt-len %d" % jumbo_size, "testpmd> ") (and jumbo_size=2048) calls rte_eth_dev_set_mtu. How should this function interpret MTU? It believe it is not clearly stated, however for many drivers MTU is length of the IP header + its payload. Is there a DPDK convention saying otherwise? I mean, in send_packet_method padding is calculated subtracting both IP header size and ether header size. I just want to know where the border of dropping a packet should lie. Secondly, why HEADER_SIZE['eth'] is equal 18? Does it take into account FCS? Are is there any other reason? And why rx_bytes_exp and tx_bytes_exp is decreased by at least 4? (send_packet method). Last but not least, why for powerville, psringville or kawela_4 jumbo_size is increased by 4? This happens as well in test_enable_disablejumbo. Thanks in advance for the response. Regards, Angela Czubak