[ofa-general][PATCH 1/3]mlx4: Multiple completion vectors support

[Yevgeny Petrilin]

Roland,

> We encountered a problem that when a machine didn't support the
> required number of vectors (nvec),
> instead of trying to get 2 vectors like in the previous version, it
> didn't use MSI-X at all - causing a major performance degradation.
> Maybe in a case of failure we should try lowering the number of
> vectors to 2 (like in the previous version) or the return value of
> pci_enable_msix and goto no_msi only in case of a second failure.
> 
> Ron
I agree with Ron on this issue, trying to get the number of vectors that was returned by
pci_enable_msix seems to be the better solution in case of failure.

As for the rest of the patch, I didn't find any major problems, except for a small typo:
> +			mdev->profile.prof[i].rx_ring_num = dev->caps.num_comp_vectors;;
The driver worked fine with the new addition.

Thanks,
Yevgeny