Hey Neel,
I suspect that the ath0 controller does not support MSI/MSI-x
interrupts. The output of 'pciconf -lvbc' on the host will confirm if
this is the case.

thanks for the hint. The controller should support MSI interrupts.

root@test10:/usr/src/sys # pciconf -lvbc

ath0@pci0:5:0:0: class=0x028000 card=0x30a4168c chip=0x002e168c rev=0x01 hdr=0x00
    vendor     = 'Atheros Communications Inc.'
    device     = 'AR9287 Wireless Network Adapter (PCI-Express)'
    class      = network
bar [10] = type Memory, range 64, base 0xf7100000, size 65536, enabled
    cap 01[40] = powerspec 3  supports D0 D1 D3  current D0
    cap 05[50] = MSI supports 1 message
cap 10[60] = PCI-Express 2 legacy endpoint max data 128(128) link x1(x1)
                 speed 2.5(2.5) ASPM L0s/L1(L0s/L1)
    ecap 0001[100] = AER 1 0 fatal 0 non-fatal 1 corrected
    ecap 0002[140] = VC 1 max VC0
    ecap 0003[160] = Serial 1 001517ffff241412
    ecap 0004[170] = Power Budgeting 1

But as I read in https://wiki.freebsd.org/dev/ath_hal%284%29/AR9300, MSI interrupts are not supported before AR9300 HAL.

So i'll buy an other card and try again.

But it would be a good idea to add the check for supported MSI/MSI-x interrupts to the https://wiki.freebsd.org/bhyve/pci_passthru .



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