• Alessandro Rubini's avatar
    pfilter: simplify the rule-set and make it stronger. Use one set only. · e35610a6
    Alessandro Rubini authored
    This changes the pfilter rule-set, to make it ready for vlan addition.
    Moreover, it removes the choice between three rule-sets and uses one
    that works for everyone (we'll add the vlan option later on).
    Moreover, we prepare for the option of peer-delay PTP and UDP-based PTP.
    As a side effect, one Kconfig option is removed.
    We know for sure that what goes to the "streamer" protocol
    is re-checked, so the streamer can get some "everything else", exactly
    like the 7S wr-nic (that sends to the host everything unused).
    This is the current rule set:
         - everything tagged is dropped
         - CPU: arp broadcast, not unicast (i.e. requests only).
         - CPU: PTP ethtype. Any mac address.
         - CPU: ICMP unicast, not broadcast.
         - CPU: UDP (uni/multicast), ports  bootpc, ptp-event, ptp-general.
         - Etherbone (class 7): UDP (uni/multicast) and port 0xebd0
         - Other fabric (class 6): anything not Etherbone (inverted class 7 bit)
    This counts up to 28 rules. We have 4 more rules available and we may
    add options, either at build time or run time to add udp ports or
    other ethertypes.  Or not...
    2 caveats:
      - frames for the CPU will have class bits 0x41 instead of 0x01, because
      everything not etherbone will receive bit 6. This is not a problem, as
      the CPU is not checking the class bits.
      - the wr-nic gateware, when using this new sw code base, must be
      changed to use classes 6 and 7 like everybody else, not classes 7
      and 5.
    Signed-off-by: Alessandro Rubini's avatarAlessandro Rubini <rubini@gnudd.com>
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