|WARNING| app/testpmd: fix stale queue-count check order

[dpdklab at iol.unh.edu]

Test-Label: ai-code-review
Test-Status: WARNING
https://dpdk.org/patch/169102

_AI Code Review_

=== Patch Review: series.patch (via Claude) ===
Review date: 2026-09-04

# DPDK Patch Review

## Summary
This patch fixes a bug in testpmd where queue count validation could incorrectly reject valid queue counts due to stale cached device information. The fix is straightforward: refresh the device info cache (`init_port_config()`) before rebuilding the forwarding stream configuration (`fwd_config_setup()`).

## Findings

### Correctness (No Issues)
 No resource leaks, use-after-free, or race conditions identified
 No NULL pointer dereferences
 No missing error checks
 No incorrect error propagation
 The logic change appears correct: refreshing cached data before using it is the right fix

### Code Style (No Issues)
 Indentation and formatting are correct (tabs for indentation)
 No trailing whitespace
 No forbidden tokens
 No deprecated API usage
 Function call order change is straightforward and clear

### API and Documentation

**Warning:** Missing release notes entry

This is a bug fix that changes observable behavior (a queue count that was previously rejected will now be accepted). The patch correctly includes:
- `Fixes:` tag referencing the commit that introduced the issue
- `Cc: stable at dpdk.org` for backporting

However, it should also update the release notes to document this fix, as it affects user-visible behavior. Add an entry to `doc/guides/rel_notes/release_XX_XX.rst` (where XX_XX is the current release) under the "Fixed Issues" section describing the queue count validation fix.

### Process Compliance
 Patch is self-contained and should compile independently
 Commit message is clear and explains the problem and solution
 Appropriate tags for stable backport

## Recommendation

**Approve with minor addition:** Add a release notes entry documenting this fix. The code change itself is correct.

Example release notes entry:
```rst
* **Fixed queue count validation in testpmd.**

  Fixed an issue where testpmd would incorrectly reject valid queue counts
  when using ``port config all txq/rxq`` if the device's queue limits had
  changed since the port was started (for example, after a traffic management
  hierarchy commit).
```