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fsl/fman: detect FMan erratum A050385

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Detect the presence of the A050385 erratum.

Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Madalin Bucur 2020-03-04 18:04:27 +02:00 committed by David S. Miller
parent b54d390086
commit b281f7b93b
3 changed files with 51 additions and 0 deletions
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28
drivers/net/ethernet/freescale/fman/Kconfig
View File

@ -8,3 +8,31 @@ config FSL_FMAN
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.

18
drivers/net/ethernet/freescale/fman/fman.c
View File

@ -1,5 +1,6 @@
/*
* Copyright 2008-2015 Freescale Semiconductor Inc.
* Copyright 2020 NXP
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
@ -566,6 +567,10 @@ struct fman_cfg {
u32 qmi_def_tnums_thresh;
};
#ifdef CONFIG_DPAA_ERRATUM_A050385
static bool fman_has_err_a050385;
#endif
static irqreturn_t fman_exceptions(struct fman *fman,
enum fman_exceptions exception)
{
@ -2518,6 +2523,14 @@ struct fman *fman_bind(struct device *fm_dev)
}
EXPORT_SYMBOL(fman_bind);
#ifdef CONFIG_DPAA_ERRATUM_A050385
bool fman_has_errata_a050385(void)
{
return fman_has_err_a050385;
}
EXPORT_SYMBOL(fman_has_errata_a050385);
#endif
static irqreturn_t fman_err_irq(int irq, void *handle)
{
struct fman *fman = (struct fman *)handle;
@ -2845,6 +2858,11 @@ static struct fman *read_dts_node(struct platform_device *of_dev)
goto fman_free;
}
#ifdef CONFIG_DPAA_ERRATUM_A050385
fman_has_err_a050385 =
of_property_read_bool(fm_node, "fsl,erratum-a050385");
#endif
return fman;
fman_node_put:

5
drivers/net/ethernet/freescale/fman/fman.h
View File

@ -1,5 +1,6 @@
/*
* Copyright 2008-2015 Freescale Semiconductor Inc.
* Copyright 2020 NXP
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
@ -398,6 +399,10 @@ u16 fman_get_max_frm(void);
int fman_get_rx_extra_headroom(void);
#ifdef CONFIG_DPAA_ERRATUM_A050385
bool fman_has_errata_a050385(void);
#endif
struct fman *fman_bind(struct device *dev);
#endif /* __FM_H */