add support for datalinks other than ethernet

[drunkirishcoder]

Description

Add a trait Datalink that makes it possible to support a different datalink for IP packets. The only other applicable datalink supported by DPDK is InfiniBand through Mellanox NICs. #144

This is a breaking change. Previously it was assumed that IP packets (both v4 and v6) will only be encapsulated inside an Ethernet frame, which is the overwhelming majority of the use case of DPDK. After the change, the struct becomes a generic struct, Ipv4<E: Datalink>.

Type of change

• Bug fix
• New feature
• New protocol
• Breaking change
• Documentation update

Checklist

• Associated tests
• Associated documentation

[codecov]

Codecov Report

❌ Patch coverage is 70.14634% with 306 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.44%. Comparing base (87ecc82) to head (b1e9b9d).
⚠️ Report is 10 commits behind head on djin/0.2.0-alpha.

Files with missing lines	Patch %	Lines
core/src/runtime/port.rs	59.46%	107 Missing ⚠️
core/src/runtime/mod.rs	12.85%	61 Missing ⚠️
core/src/runtime/pcap_dump.rs	39.75%	50 Missing ⚠️
core/src/runtime/lcore.rs	58.00%	21 Missing ⚠️
core/src/packets/size_of.rs	0.00%	14 Missing ⚠️
core/src/testils/proptest/strategy.rs	39.13%	14 Missing ⚠️
core/src/runtime/config.rs	77.58%	13 Missing ⚠️
core/src/runtime/mempool.rs	82.97%	8 Missing ⚠️
core/src/testils/packet.rs	27.27%	8 Missing ⚠️
core/src/packets/icmp/v4/echo_reply.rs	71.42%	2 Missing ⚠️
... and 5 more

Additional details and impacted files

@@                 Coverage Diff                  @@
##           djin/0.2.0-alpha     #145      +/-   ##
====================================================
+ Coverage             68.40%   76.44%   +8.04%     
====================================================
  Files                    66       50      -16     
  Lines                  5972     5048     -924     
====================================================
- Hits                   4085     3859     -226     
+ Misses                 1887     1189     -698     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.