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User-configurable physical MTU for individual links

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This patch allows users to specify the physical layer MTU for individual links
when in multipath mode. For example:

{
  "settings":
  {
    "defaultBondingPolicy": "custom-balance-xor",
    "policies":
    {
      "custom-balance-xor":
      {
        "basePolicy": "balance-xor",
        "failoverInterval": 5000,
        "links": {
          "weird_5g_link": { "mtu": 1300 },
          "enp5s0": { "mtu": 1400  }
        }
      }
    }
  }
}
This commit is contained in:
Joseph Henry 2023-01-11 20:12:15 -08:00 • committed by Sean OMeara
parent eccc31a4b9
commit 39f3f5b2d9
6 changed files with 36 additions and 7 deletions
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11
node/Switch.cpp
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@ -1009,7 +1009,8 @@ bool Switch::_trySend(void *tPtr,Packet &packet,bool encrypt,int32_t flowId)
Mutex::Lock _l(peer->_paths_m);
for(int i=0;i<ZT_MAX_PEER_NETWORK_PATHS;++i) {
if (peer->_paths[i].p && peer->_paths[i].p->alive(now)) {
_sendViaSpecificPath(tPtr,peer,peer->_paths[i].p,now,packet,encrypt,flowId);
uint16_t userSpecifiedMtu = peer->_paths[i].p->mtu();
_sendViaSpecificPath(tPtr,peer,peer->_paths[i].p, userSpecifiedMtu,now,packet,encrypt,flowId);
}
}
return true;
@ -1025,7 +1026,8 @@ bool Switch::_trySend(void *tPtr,Packet &packet,bool encrypt,int32_t flowId)
}
}
if (viaPath) {
_sendViaSpecificPath(tPtr,peer,viaPath,now,packet,encrypt,flowId);
uint16_t userSpecifiedMtu = viaPath->mtu();
_sendViaSpecificPath(tPtr,peer,viaPath,userSpecifiedMtu,now,packet,encrypt,flowId);
return true;
}
}
@ -1033,12 +1035,15 @@ bool Switch::_trySend(void *tPtr,Packet &packet,bool encrypt,int32_t flowId)
return false;
}
void Switch::_sendViaSpecificPath(void *tPtr,SharedPtr<Peer> peer,SharedPtr<Path> viaPath,int64_t now,Packet &packet,bool encrypt,int32_t flowId)
void Switch::_sendViaSpecificPath(void *tPtr,SharedPtr<Peer> peer,SharedPtr<Path> viaPath,uint16_t userSpecifiedMtu, int64_t now,Packet &packet,bool encrypt,int32_t flowId)
{
unsigned int mtu = ZT_DEFAULT_PHYSMTU;
uint64_t trustedPathId = 0;
RR->topology->getOutboundPathInfo(viaPath->address(),mtu,trustedPathId);
if (userSpecifiedMtu > 0) {
mtu = userSpecifiedMtu;
}
unsigned int chunkSize = std::min(packet.size(),mtu);
packet.setFragmented(chunkSize < packet.size());