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discussion: RAWETH_ADDITION & HW_CRC_ADDITION #298

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changchengx opened this issue Nov 21, 2024 · 2 comments
Open

discussion: RAWETH_ADDITION & HW_CRC_ADDITION #298

changchengx opened this issue Nov 21, 2024 · 2 comments

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@changchengx
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changchengx commented Nov 21, 2024 •
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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
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@HassanKhadour @sshaulnv Could you help check the above question when you have time?

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

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