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Re: [lwip-devel] Problem with custom buffers when MEM_ALIGNMENT=4 and ET
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From: |
Simon Goldschmidt |
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Subject: |
Re: [lwip-devel] Problem with custom buffers when MEM_ALIGNMENT=4 and ETH_PAD_SIZE=2 |
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Date: |
Wed, 26 Oct 2011 08:45:35 +0200 |
Mason <address@hidden> wrote:
> I think there might be another problem when pbuf_layer = PBUF_LINK
>
> Assume payload = 0x82751742, thus the IP header is at 0x82751742 + 0xd =
> 0x82751750
> but the actual code will set payload to payload_mem + 16
But why would you pass in payload = 0x82751742 if PBUF_LINK_HLEN==16 (which
means ETH_PAD_SIZE=2)?
I would have expected to either pass in
a) payload=0x82751742 for ETH_PAD_SIZE=0
b) payload=0x82751740 for ETH_PAD_SIZE=1
I think payload = 0x82751742 doesn't fit to ETH_PAD_SIZE=1.
Simon
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