forked from Minki/linux
408eccce32
This commit fixes a build error reported by Fengguang, that is
triggered when CONFIG_NETWORK_PHY_TIMESTAMPING is not set:
ERROR: "ptp_classify_raw" [drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.ko] undefined!
The fix is to introduce its own file for the PTP BPF classifier,
so that PTP_1588_CLOCK and/or NETWORK_PHY_TIMESTAMPING can select
it independently from each other. IXP4xx driver on ARM needs to
select it as well since it does not seem to select PTP_1588_CLOCK
or similar that would pull it in automatically.
This also allows for hiding all of the internals of the BPF PTP
program inside that file, and only exporting relevant API bits
to drivers.
This patch also adds a kdoc documentation of ptp_classify_raw()
API to make it clear that it can return PTP_CLASS_* defines. Also,
the BPF program has been translated into bpf_asm code, so that it
can be more easily read and altered (extensively documented in [1]).
In the kernel tree under tools/net/ we have bpf_asm and bpf_dbg
tools, so the commented program can simply be translated via
`./bpf_asm -c prog` where prog is a file that contains the
commented code. This makes it easily readable/verifiable and when
there's a need to change something, jump offsets etc do not need
to be replaced manually which can be very error prone. Instead,
a newly translated version via bpf_asm can simply replace the old
code. I have checked opcode diffs before/after and it's the very
same filter.
[1] Documentation/networking/filter.txt
Fixes: 164d8c6665 ("net: ptp: do not reimplement PTP/BPF classifier")
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Jiri Benc <jbenc@redhat.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
32 lines
944 B
Plaintext
32 lines
944 B
Plaintext
#
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# Intel XScale IXP device configuration
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#
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config NET_VENDOR_XSCALE
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bool "Intel XScale IXP devices"
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default y
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depends on NET_VENDOR_INTEL && (ARM && ARCH_IXP4XX && \
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IXP4XX_NPE && IXP4XX_QMGR)
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---help---
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If you have a network (Ethernet) card belonging to this class, say Y
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and read the Ethernet-HOWTO, available from
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<http://www.tldp.org/docs.html#howto>.
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Note that the answer to this question does not directly affect the
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kernel: saying N will just cause the configurator to skip all
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the questions about XSacle IXP devices. If you say Y, you will be
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asked for your specific card in the following questions.
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if NET_VENDOR_XSCALE
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config IXP4XX_ETH
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tristate "Intel IXP4xx Ethernet support"
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depends on ARM && ARCH_IXP4XX && IXP4XX_NPE && IXP4XX_QMGR
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select PHYLIB
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select NET_PTP_CLASSIFY
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---help---
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Say Y here if you want to use built-in Ethernet ports
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on IXP4xx processor.
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endif # NET_VENDOR_XSCALE
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