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| author | Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu> | 2025-07-09 12:28:08 +0300 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2025-07-15 09:56:01 -0600 |
| commit | 5d49fa9e56bb0e0b085f5c794ba508349385f6b8 (patch) | |
| tree | 06eab03d6ceb9c49ff562cd12ae9cd4c2314879d /drivers/ddr/fsl/mpc86xx_ddr.c | |
| parent | 189d0b4477077f0445772d7899d8bd0a17e1f67a (diff) | |
drivers/net/airoha_eth: fix packet transmission errors
The dma_map_single() function calls one of the functions
* invalidate_dcache_range(),
* flush_dcache_range().
Both of them expect that 'vaddr' is aligned to the ARCH_DMA_MINALIGN
boundary. Unfortunately, RX/TX descriptors are 32-byte long. Thus they
might not be aligned to the ARCH_DMA_MINALIGN boundary. Data flushing
(or invalidating) might do nothing in this case.
The same applies to dma_unmap_single() function.
In the TX path case the issue might prevent package transmission (filled
TX descriptor was not flushed).
To fix an issue a special wrappers for
* dma_map_single(),
* dma_unmap_single()
functions were created. The patch fix flushing/invalidatiog for the
RX path as well.
The bug appears on 32-bit airoha platform, but should be present on
64-bit as well.
The code was tested both on 32-bit and 64-bit airoha boards.
Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu>
Diffstat (limited to 'drivers/ddr/fsl/mpc86xx_ddr.c')
0 files changed, 0 insertions, 0 deletions