Re: [Intel-wired-lan] [PATCH net-next v3 1/2] ice: Implement control of FCS/CRC stripping

[Tony Nguyen <anthony.l.nguyen@intel.com>]

On 7/25/2022 12:02 AM, Anatolii Gerasymenko wrote:
> From: Jesse Brandeburg <jesse.brandeburg@intel.com>
> 
> 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 <on|off>
> 
> 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 <jesse.brandeburg@intel.com>
> Co-Developed-by: Grzegorz Nitka <grzegorz.nitka@intel.com>
> Signed-off-by: Grzegorz Nitka <grzegorz.nitka@intel.com>
> Co-Developed-by: Benjamin Mikailenko <benjamin.mikailenko@intel.com>
> Signed-off-by: Benjamin Mikailenko <benjamin.mikailenko@intel.com>
> Co-Developed-by: Anatolii Gerasymenko <anatolii.gerasymenko@intel.com>
> Signed-off-by: Anatolii Gerasymenko <anatolii.gerasymenko@intel.com>

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