Luigi Rizzo writes:
> Does anyone know of specific reasons to use m_devget()
> to extract received packets from the rx buffer in the "dc"
> driver, as opposed to passing up the mbuf and just
> replacing it with a fresh one in the controller's queue ?
>
> Other drivers just happily do the latter, including the "de"
> driver, so there seems to be no problem with the chipset
> in handling this ?
I imagine that this was done to follow alignment constraints on
non-i386 platforms where having the ip header misaligned is fatal.
(the tulip is not capable of byte granularity DMA, so you can't
intentionally misalign the ethernet header & end up with an aligned IP
header)
I imagine the i386 should be made an exception. See rev 1.17 of
sys/dev/nge/if_nge.c
Drew
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