[dpdk-dev] Questions about keeping CRC

Min Hu (Connor) humin29 at huawei.com
Fri Mar 19 13:13:20 CET 2021


Hi, all,
	DPDK has introduced one offload: DEV_RX_OFFLOAD_KEEP_CRC. It means that 
the device has the ablility of keeping CRC(four bytes at the end of 
packet)of packet in RX.
	In common scenarios, When one packet enter into NIC device, NIC
will check the CRC and then strip the CRC,at last send the packet into 
the buffer.
	So my question is:
	 why the DEV_RX_OFFLOAD_KEEP_CRC is introduced into DPDK?  I think that 
when the packet enter into the NIC, the CRC will has no significance to 
APP. Or is there any scenarios that CRC is useful for APP?
	Thanks for your reply.


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