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iflib: introduce isc_dma_width

Description

iflib: introduce isc_dma_width

Some DMA controllers are unable to address the full host memory space
and are instead limited to a subset of address range (e.g. 48-bit).

Allow the driver to specify the maximum allowed DMA addressing width
(in bits) for the NIC hardware, by introducing a new field in
if_softc_ctx.

If said field is omitted (set to 0), the lowaddr of DMA window bounds
defaults to BUS_SPACE_MAXADDR.

Submitted by: Artur Rojek <ar@semihalf.com>
Obtained from: Semihalf
Sponsored by: Amazon, Inc.
Differential Revision: https://reviews.freebsd.org/D28706

Details

Provenance
mwAuthored on Feb 24 2021, 10:56 PM
Differential Revision
D28706: iflib: add new field: isc_dma_width
Parents
R10:cc3fa1e29fda: Fix crash with rtadv-originated multipath IPv6 routes.
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