[Bug 265714] igc(4) drops link under high traffic

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265714

--- Comment #72 from [email protected] ---
A commit in branch stable/15 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=fd9a9cbcdf27e8dabec9c4ce3edf4c4f868f0cf2

commit fd9a9cbcdf27e8dabec9c4ce3edf4c4f868f0cf2
Author:     Kevin Bowling <[email protected]>
AuthorDate: 2026-08-03 09:55:15 +0000
Commit:     Kevin Bowling <[email protected]>
CommitDate: 2026-08-08 00:37:45 +0000

    igc: Disable PCIe L1.2 on I225

    I225 devices can incorrectly enter L1 substates while CLKREQ# is
    asserted, both while idle and in D3.  Disable ASPM and PCI-PM L1.2 on
    I225 to prevent the resulting packet loss.

    Keep the I226 workaround ASPM-only because it addresses a separate
    traffic exit latency observation.

    PR:             265714

    (cherry picked from commit 4a28d390f5fbae2483e88805559881b04ccf9a80)

 sys/dev/igc/if_igc.c   | 42 ++++++++++++++++++++++--------------------
 sys/dev/igc/igc_base.c | 29 +++++++++++++++++++++++++++++
 sys/dev/igc/igc_base.h |  1 +
 3 files changed, 52 insertions(+), 20 deletions(-)

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