tree c83ba26d5cc2e970c271f46d64b47e9767bce908
parent 3a68f19d7afb80f548d016effbc6ed52643a8085
author Ben Hutchings <bhutchings@solarflare.com> 1357861914 +0000
committer Ben Hutchings <bhutchings@solarflare.com> 1361890636 +0000

sfc: Fix efx_rx_buf_offset() in the presence of swiotlb

We assume that the mapping between DMA and virtual addresses is done
on whole pages, so we can find the page offset of an RX buffer using
the lower bits of the DMA address.  However, swiotlb maps in units of
2K, breaking this assumption.

Add an explicit page_offset field to struct efx_rx_buffer.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>