Double Zero support

[ripatel-fd]

Firedancer does not yet support Double Zero. See sub issues

Firedancer can gain Double Zero support via two ways:
The 'fast track' option is to use sockets. Comes with a performance hit but is good enough for mainnet. The proper implementation uses XDP.

Fast track

• Socket tile support ([v0.5] sock tile #4339)
• Extract dst IP from ancillary data / cmsg ([net 2.0] Fix RX dst IPs in socket tile #4451)
• Allow setting src IP using ancillary data / cmsg (net 2.0: Fix TX src IPs in socket tile #4459)
• Let app tiles accept traffic for all dst IPs (multihoming)
  • quic tile ([net 2.0] fd_quic multihoming #4458)
  • shred tile (net 2.0: shred tile multihoming #4465)
  • gossip tile
  • repair tile (net 2.0: repair tile multihoming #4463)
  • sender tile
• Confirm we expose required Agave config options for DZ

Proper Implementation

In addition to the 'fast track' items, these items are required to get XDP support:

• Net src IP logic: Let app tiles use src IP '0.0.0.0' when initiating a UDP flow. True src IP to be filled in by the net tile according to the routing table (net 2.0: XDP pref source address selection #4460)
  • prefsrc fallback [net 2.0] prefsrc fallback #4464
• Netlink tunnel config monitor
• XDP GRE RX support
• XDP GRE TX support
• Modify XDP program to accept traffic for all dst IPs (Optimize XDP program #4371)
• Add reverse path filter
• Support a large route table