[lwip-devel] [bug #27352] Change ip_addr from struct to typedef (u32_t)

[Simon Goldschmidt]

Follow-up Comment #8, bug #27352 (project lwip):

> When I looked into this, I noticed that all references to an 
> ip_addr within a payload are within a packet

Well, that's the point: without special optimization, all these addresses are
16-bit aligned because of the 14-byte ethernet header. And on some platforms
where the DMA of the MAC can only transfer to/from 32-bit aligned memory, this
means to get these addresses aligned we would have to issue a memcpy/memmove.

For the tx side, this is no problem though, since we only copy the address
(into a packed struct). But we cannot just pass around a received address.

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