discussion: RAWETH_ADDITION & HW_CRC_ADDITION

[changchengx]

The RAWETH_ADDITION is defined as 18 and HW_CRC_ADDITION is defined as 4

#define RAWETH_ADDITION    (18)
#define HW_CRC_ADDITION    (4)

Initially, the frame length is set to be ctx->size - RAWETH_ADDITION
Question

• Why RAWETH_ADDITION is set to be 18 instead of 14?
• Why the sge.length is set to be user_param->size - HW_CRC_ADDITION?
• How to get the result of FCS if there's reserved space(HW_CRC_ADDITION) for FCS?

[changchengx]

@HassanKhadour @sshaulnv Could you help check the above question when you have time?

[changchengx]

From my perspective, RAWETH_ADDITION could be set to be 14. sge.length could be set to be user_param->size