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

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 10 Aug 2022 00:26:11 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230807

--- Comment #14 from Ed Maste <emaste@freebsd.org> ---
OpenBSD's version of the driver has a slightly different approach for the same
thing, but it all involves the code around the comment

                /*
                 * Force maximum payload size to 128 bytes for
                 * E2200/E2400/E2500/AR8162/AR8171/AR8172.
                 * Otherwise it triggers DMA write error.
                 */

OpenBSD changed the if condition to

                if ((sc->alc_flags &
                    (ALC_FLAG_E2X00 | ALC_FLAG_AR816X_FAMILY)) != 0)
                        sc->alc_dma_wr_burst = 0;

In any case, if any version of the patch is confirmed to "fix" the issue we can
get something committed.

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