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charset="us-ascii"; Format="flowed" Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 7/25/2022 12:02 AM, Anatolii Gerasymenko wrote: > From: Jesse Brandeburg > > The driver can allow the user to configure whether the CRC aka the FCS > (Frame Check Sequence) is DMA'd to the host as part of the receive > buffer. The driver usually wants this feature disabled so that the > hardware checks the FCS and strips it in order to save PCI bandwidth. > > Control the reception of FCS to the host using the command: > ethtool -K eth0 rx-fcs > > The default shown in ethtool -k eth0 | grep fcs; should be "off", as the > hardware will drop any frame with a bad checksum, and DMA of the > checksum is useless overhead especially for small packets. > > Testing Hints: > test the FCS/CRC arrives with received packets using > tcpdump -nnpi eth0 -xxxx > and it should show crc data as the last 4 bytes of the packet. Can also > use wireshark to turn on CRC checking and check the data is correct. > > Signed-off-by: Jesse Brandeburg > Co-Developed-by: Grzegorz Nitka > Signed-off-by: Grzegorz Nitka > Co-Developed-by: Benjamin Mikailenko > Signed-off-by: Benjamin Mikailenko > Co-Developed-by: Anatolii Gerasymenko > Signed-off-by: Anatolii Gerasymenko WARNING: 'Co-developed-by:' is the preferred signature form _______________________________________________ Intel-wired-lan mailing list Intel-wired-lan@osuosl.org https://lists.osuosl.org/mailman/listinfo/intel-wired-lan