38 lines
1.5 KiB
Plaintext
38 lines
1.5 KiB
Plaintext
config FSL_FMAN
|
|
tristate "FMan support"
|
|
depends on FSL_SOC || ARCH_LAYERSCAPE || COMPILE_TEST
|
|
select GENERIC_ALLOCATOR
|
|
select PHYLIB
|
|
default n
|
|
help
|
|
Freescale Data-Path Acceleration Architecture Frame Manager
|
|
(FMan) support
|
|
|
|
config DPAA_ERRATUM_A050385
|
|
bool
|
|
depends on ARM64 && FSL_DPAA
|
|
default y
|
|
help
|
|
DPAA FMan erratum A050385 software workaround implementation:
|
|
align buffers, data start, SG fragment length to avoid FMan DMA
|
|
splits.
|
|
FMAN DMA read or writes under heavy traffic load may cause FMAN
|
|
internal resource leak thus stopping further packet processing.
|
|
The FMAN internal queue can overflow when FMAN splits single
|
|
read or write transactions into multiple smaller transactions
|
|
such that more than 17 AXI transactions are in flight from FMAN
|
|
to interconnect. When the FMAN internal queue overflows, it can
|
|
stall further packet processing. The issue can occur with any
|
|
one of the following three conditions:
|
|
1. FMAN AXI transaction crosses 4K address boundary (Errata
|
|
A010022)
|
|
2. FMAN DMA address for an AXI transaction is not 16 byte
|
|
aligned, i.e. the last 4 bits of an address are non-zero
|
|
3. Scatter Gather (SG) frames have more than one SG buffer in
|
|
the SG list and any one of the buffers, except the last
|
|
buffer in the SG list has data size that is not a multiple
|
|
of 16 bytes, i.e., other than 16, 32, 48, 64, etc.
|
|
With any one of the above three conditions present, there is
|
|
likelihood of stalled FMAN packet processing, especially under
|
|
stress with multiple ports injecting line-rate traffic.
|