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

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

Lexi Winter <lexi.freebsd@le-fay.org> changed:

           What    |Removed                     |Added
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                 CC|                            |lexi.freebsd@le-fay.org

--- Comment #22 from Lexi Winter <lexi.freebsd@le-fay.org> ---
Created attachment 247305
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=247305&action=edit
WIP patch

i've been playing around with this a bit and it seems like for MSI-X to work,
the driver needs a mapping table set up to tell it which msix tx/rx queues are
enabled.

this patch makes the card work, except there's an odd 1-second delay on all
packets:

64 bytes from 10.1.4.1: icmp_seq=0 ttl=64 time=1000.038 ms
64 bytes from 10.1.4.1: icmp_seq=1 ttl=64 time=1000.037 ms
64 bytes from 10.1.4.1: icmp_seq=2 ttl=64 time=1000.035 ms
64 bytes from 10.1.4.1: icmp_seq=3 ttl=64 time=1000.037 ms

this patch only enables RXQ0; the Linux driver also enables TXQ0, but that
prevents msix from working at all for me; either i'm doing something wrong or
there's another step i missed.

alc0@pci0:33:0:0:       class=0x020000 rev=0x10 hdr=0x00 vendor=0x1969
device=0xe0b1 subvendor=0x1462 subdevice=0x7b77
    vendor     = 'Qualcomm Atheros'
    device     = 'Killer E2500 Gigabit Ethernet Controller'
    class      = network
    subclass   = ethernet

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