net: lantiq_xrx200: add ingress SG DMA support

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This patch adds support for scatter gather DMA. DMA in PMAC splits
the packet into several buffers when the MTU on the CPU port is
less than the MTU of the switch. The first buffer starts at an
offset of NET_IP_ALIGN. In subsequent buffers, dma ignores the
offset. Thanks to this patch, the user can still connect to the
device in such a situation. For normal configurations, the patch
has no effect on performance.

Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Aleksander Jan Bajkowski 2022-01-03 20:43:16 +01:00 • committed by David S. Miller

parent 7a71c8aa0a

commit c3e6b2c35b

1 changed files with 40 additions and 7 deletions

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drivers/net/ethernet/lantiq_xrx200.c

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