CVS commit: src/sys/dev/ic

["Tobias Nygren" <tnn%netbsd.org@localhost>]

Module Name:    src
Committed By:   tnn
Date:           Tue Oct 15 16:30:49 UTC 2019

Modified Files:
        src/sys/dev/ic: dwc_gmac.c

Log Message:
awge: fix issue that caused rx packets to be corrupt with DIAGNOSTIC kernel

It seems the hardware can only reliably do rx DMA to addresses that are
dcache size aligned. This is hinted at by some GMAC data sheets but hard to
find an authoritative source.

on non-DIAGNOSTIC kernels we always implicitly get MCLBYTES-aligned mbuf
data pointers, but with the reintroduction of POOL_REDZONE for DIAGNOSTIC
we can get 8-byte alignment due to redzone padding. So align rx pointers to
64 bytes which should be good for both arm32 and aarch64.

While here change some bus_dmamap_load() to bus_dmamap_load_mbuf() and add
one missing bus_dmamap_sync(). Also fixes the code to not assume that
MCLBYTES == AWGE_MAX_PACKET. User may override MCLSHIFT in kernel config.


To generate a diff of this commit:
cvs rdiff -u -r1.65 -r1.66 src/sys/dev/ic/dwc_gmac.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.