1. 24 Nov, 2023 34 commits
  2. 17 Nov, 2023 6 commits
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb: Adjust DHCP server to provide dedicated IPv6 to each Radio Unit · cbc3929c
      Kirill Smelkov authored
      By reusing recently added "split TAP" infrastructure we can adjust dnsmasq
      configuration to provide unique IPv6 to each RU.
      
      - ru_mac_addr becomes per-RU setting and without default. We talked with Lu, and
        since now all Lopcomm units are shipped from the factory with unique MAC, it
        both does not make sense to provide the default, and we can rely on all units
        to have different MACs and configure DHCP replies based on that.
      
      - No need to provide /64 network to every RU. We cannot actually do that anyway
        because normally SlapOS provides /71 address range for its slaptap. In the
        new configuration everything works with smaller networks just ok.
      
      /cc @jhuge, @xavier_thompson, @Daetalus
      /reviewed-by @lu.xu
      /reviewed-on nexedi/slapos!1472
      cbc3929c
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb: Remove DNS options from for-RU DHCP configuration · 30b4cec5
      Kirill Smelkov authored
      Those options are not needed, because we need to only provide IPv6 address to
      RU, and also they are not very meaningful: in the current form we tell RU that
      DNS addresses sit at RU.addr+1 and RU.addr+2, i.e. in the IP range we give to
      RU and also at the addresses where no DNS server is actually running.
      
      It was probably a thinko to add those options initially.
      
      /cc @jhuge, @xavier_thompson, @Daetalus
      /reviewed-by @lu.xu
      /reviewed-on nexedi/slapos!1472
      30b4cec5
    • Kirill Smelkov's avatar
      software/ors-amarisoft: Split dnsmasq.cfg into for-core and for-enb · 9f2b9db5
      Kirill Smelkov authored
      Core Network and ENB use dnsmasq for completely different purposes:
      
      - core network uses it to provide DNS server, while
      - enb uses dnsmasq to provide DHCP server for Radio Units to be able to access
        Control & Management channel on the CPRI link.
      
      -> Even though both those services are handled via same dnsmasq program, it
         makes sense to split dnsmasq config for clarity and as preparation for
         further adjustments of enb part.
      
         We also push config rendering down to -core and -enb instances also for
         clarity, and because in enb case rendering will need to know set of
         configured Radio Units - information that will become loaded only at
         instance-enb.
      
      /cc @jhuge, @xavier_thompson, @Daetalus
      /reviewed-by @lu.xu
      /reviewed-on nexedi/slapos!1472
      9f2b9db5
    • Kirill Smelkov's avatar
      software/ors-amarisoft: Provide dedicated TAP interface for each Radio Unit · 49ce8ef5
      Kirill Smelkov authored
      SlapOS provides to each partition dedicated TAP interface, so that an instance
      could organize internal networking. In practice this is used by KVM software
      release and here in ors-amarisoft, where we feed to eNB such TAP interface for
      CPRI-based radio unit so that eNB, in turn, could provide access to CPRI
      Control and Management channel via provided TAP.
      
      However there is a problem: SlapOS provides only one TAP interface per
      instance, while we need to have one TAP for each Radio Unit.
      
      -> Solve this problem by creating TAP "subinterfaces" per each RU ourselves.
      
      The interfaces we create are full TAP interfaces, just we name them with prefix
      based on main interface, and we allocate only part of address space of sole
      SlapOS TAP to each subtap. For example if SlapOS provided us slaptap16 with
      2401:5180:0:66:a200::/71 IPv6 range and we want to split it for 2 radio units,
      we'll be splitting it into 3 regions as follows:
      
          slaptap16: split 2401:5180:0:66:a200::/71 by 2
          preserve         2401:5180:0:66:a200::/73
          -> slaptap16-1   2401:5180:0:66:a280::/73
          -> slaptap16-2   2401:5180:0:66:a300::/73
      
      Here we preserve 2401:5180:0:66:a200::/73 for usage on original slaptap16, and
      we create slaptap16-1 and slaptap16-2 with correspondingly allocated address
      range subparts for the RUs.
      
      The splitting is done easily but depends on having networking administration
      capability to be able to work. We solve this with employing
      /opt/amarisoft/setcap, which we already use for dnsmasq, and with compiled
      trampoline program because setcap does not really work directly on scripts.
      
      To avoid hard dependency on having network capability rights, we fallback to
      using regular SlapOS slaptap in case there is only one RU.
      
      ru/lopcomm/* and enb.cfg are adapted straightforwardly, but dnsmasq adaptation
      is left to a later step not to mix everything into one pile.
      
      NOTE that relying on setcap is not a good in the long term and should be
           reworked once SlapOS is improved to provide ability for instances to
           request several TAP interfaces. Please see discussion at
           nexedi/slapos!1471 (comment 194356)
           for details.
      
      /cc @jhuge, @lu.xu, @xavier_thompson, @Daetalus
      /reviewed-on nexedi/slapos!1471
      49ce8ef5
    • Kirill Smelkov's avatar
      software/ors-amarisoft: gnb: Move DRB configuration to standalone file · 695518f2
      Kirill Smelkov authored
      A preparatory step for multiRU for the same reason as for LTE and also to be
      able to support Carrier Aggregation in between NR and LTE cells in the future
      (called Dual Connectivity by 3GPP).
      
      /cc @xavier_thompson, @Daetalus
      /reviewed-by @jhuge, @lu.xu
      /reviewed-on !1473
      695518f2
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb: Don't use #define inside DRB template · accc2c86
      Kirill Smelkov authored
      When there will be multiple cells and so multiple DRB files referenced from enb.cfg,
      eNB will complain with an error that "there are multiple #define" for T_REORDERING.
      
      -> Use jinja2 templating instead to handle FDD/TDD conditions.
      
      /cc @xavier_thompson, @Daetalus
      /reviewed-by @jhuge, @lu.xu
      /reviewed-on nexedi/slapos!1473
      accc2c86