• Daniel Borkmann's avatar
    net: ptp: move PTP classifier in its own file · 408eccce
    Daniel Borkmann authored
    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: 164d8c66 ("net: ptp: do not reimplement PTP/BPF classifier")
    Reported-by: default avatarFengguang Wu <fengguang.wu@intel.com>
    Signed-off-by: default avatarDaniel Borkmann <dborkman@redhat.com>
    Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
    Cc: Richard Cochran <richardcochran@gmail.com>
    Cc: Jiri Benc <jbenc@redhat.com>
    Acked-by: default avatarRichard Cochran <richardcochran@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    408eccce
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