iflib MSI init

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iflib MSI init

shreyank amartya
Hi,

I'm trying to initialize a network interface using iflib. While configuring
MSI interrupts for the device, the number of vectors returned by the
pci_msi_count is 32 (max supported) in my case due to which the condition
(vectors == 1) fails and as a result legacy mode is selected. Is this
intentional? In which case, how can I make sure number of MSI vectors is 1?

/sys/net/iflib.c

   6126 msi:
   6127         vectors = pci_msi_count(dev);
   6128         scctx->isc_nrxqsets = 1;
   6129         scctx->isc_ntxqsets = 1;
   6130         scctx->isc_vectors = vectors;
   6131         if (vectors == 1 && pci_alloc_msi(dev, &vectors) == 0) {
   6132                 device_printf(dev,"Using an MSI interrupt\n");
   6133                 scctx->isc_intr = IFLIB_INTR_MSI;
   6134         } else {
   6135                 scctx->isc_vectors = 1;
   6136                 device_printf(dev,"Using a Legacy interrupt\n");
   6137                 scctx->isc_intr = IFLIB_INTR_LEGACY;
   6138         }
   6139
   6140         return (vectors);



Thanks
Shreyank Amartya
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