xdp: tx_loop: allow overriding MACs and IP

[alessandrod]

This is useful for sending via bonded NICs, skipping the bond device and targeting the slaved NICs directly so they can be used in zero copy mode.

Slaved NICs don't have an IP assigned to them, so the source IP can't be discovered but must be passed explicitly (eg the bond IP).

Overriding MACs can be useful while testing to ensure frames don't leave the switch/metro.

[Copilot]

Pull Request Overview

This PR extends the XDP tx_loop function to allow overriding source/destination MAC addresses and source IP addresses. This enables sending packets via bonded NICs by targeting slave NICs directly for zero-copy mode support, while manually specifying network parameters that would normally be auto-discovered from the device.

Key changes:

• Adds optional parameters for overriding source MAC, source IP, and destination MAC addresses
• Modifies the function signature to accept generic address collections
• Updates MAC address handling throughout the device and networking code

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
xdp/src/tx_loop.rs	Extends tx_loop function signature with optional MAC/IP overrides and implements fallback logic
xdp/src/device.rs	Changes mac_addr() return type from raw bytes to MacAddress wrapper type
turbine/src/xdp.rs	Updates tx_loop call site to pass None values for new optional parameters

[alessandrod]

I plan to rework this with a builder, but doing that separately or the diff will blow up for no reason

[bw-solana]

1 question and 1 nit, but LGTM

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 59 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.8%. Comparing base (3297ff4) to head (2396c0f).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #7285     +/-   ##
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- Coverage    82.8%    82.8%   -0.1%     
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  Files         801      801             
  Lines      363392   363418     +26     
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- Hits       301027   300947     -80     
- Misses      62365    62471    +106     

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