[Bug 230807] if_alc(4): Driver not working for Killer Networking E2200

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230807

--- Comment #28 from commit-hook@FreeBSD.org ---
A commit in branch stable/14 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=07f3a9eb1c35cab2d371895f9ed5bc33d27e1815

commit 07f3a9eb1c35cab2d371895f9ed5bc33d27e1815
Author:     Lexi Winter <lexi@le-Fay.ORG>
AuthorDate: 2024-04-22 22:09:26 +0000
Commit:     Warner Losh <imp@FreeBSD.org>
CommitDate: 2024-05-21 19:43:34 +0000

    alc(4): disable MSI-X by default on Killer cards

    Several users with alc(4)-based "Killer" Ethernet cards have reported
    issues with this driver not passing traffic, which are solved by
    disabling MSI-X using the provided tunable.

    To work around this issue, disable MSI-X by default on this card.

    This is done by having msix_disable default to 2, which means
    "auto-detect".  The user can still override this to either 0 or 1 as
    desired.

    Since these are slow (1Gbps) Ethernet ICs used in low-end systems, it's
    unlikely this will cause any practical performance issues; on the other
    hand, the card not working by default likely causes issues for many new
    FreeBSD users who find their network port doesn't work and have no idea
    why.

    PR:             230807
    MFC after:      1 week

    Reviewed by: imp
    Pull Request: https://github.com/freebsd/freebsd-src/pull/1185

    (cherry picked from commit 05a95d19cb248203acdd4e069d3eedfe597c3b49)

 share/man/man4/alc.4 |  6 +++++-
 sys/dev/alc/if_alc.c | 24 +++++++++++++++++++++++-
 2 files changed, 28 insertions(+), 2 deletions(-)

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