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39 lines
1.6 KiB
39 lines
1.6 KiB
# SPDX-License-Identifier: GPL-2.0-only |
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config FSL_FMAN |
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tristate "FMan support" |
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depends on FSL_SOC || ARCH_LAYERSCAPE || COMPILE_TEST |
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select GENERIC_ALLOCATOR |
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select PHYLIB |
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select CRC32 |
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default n |
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help |
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Freescale Data-Path Acceleration Architecture Frame Manager |
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(FMan) support |
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config DPAA_ERRATUM_A050385 |
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bool |
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depends on ARM64 && FSL_DPAA |
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default y |
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help |
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DPAA FMan erratum A050385 software workaround implementation: |
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align buffers, data start, SG fragment length to avoid FMan DMA |
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splits. |
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FMAN DMA read or writes under heavy traffic load may cause FMAN |
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internal resource leak thus stopping further packet processing. |
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The FMAN internal queue can overflow when FMAN splits single |
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read or write transactions into multiple smaller transactions |
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such that more than 17 AXI transactions are in flight from FMAN |
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to interconnect. When the FMAN internal queue overflows, it can |
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stall further packet processing. The issue can occur with any |
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one of the following three conditions: |
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1. FMAN AXI transaction crosses 4K address boundary (Errata |
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A010022) |
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2. FMAN DMA address for an AXI transaction is not 16 byte |
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aligned, i.e. the last 4 bits of an address are non-zero |
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3. Scatter Gather (SG) frames have more than one SG buffer in |
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the SG list and any one of the buffers, except the last |
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buffer in the SG list has data size that is not a multiple |
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of 16 bytes, i.e., other than 16, 32, 48, 64, etc. |
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With any one of the above three conditions present, there is |
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likelihood of stalled FMAN packet processing, especially under |
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stress with multiple ports injecting line-rate traffic.
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