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Date: Fri, 15 Jan 2016 13:48:53 +0800
From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
To: Santosh Shukla <sshukla@mvista.com>
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Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v4 06/14] eal: pci: vfio: add rd/wr func for
	pci bar space
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On Thu, Jan 14, 2016 at 06:58:29PM +0530, Santosh Shukla wrote:
...
> +int rte_eal_pci_read_bar(const struct rte_pci_device *device,
> +			 void *buf, size_t len, off_t offset,
> +			 int bar_idx)
> +
> +{
> +#ifdef VFIO_PRESENT
> +	const struct rte_intr_handle *intr_handle = &device->intr_handle;
> +	return pci_vfio_read_bar(intr_handle, buf, len, offset, bar_idx);
> +#else
> +	/* UIO's not applicable */
> +	RTE_SET_USED(device);
> +	RTE_SET_USED(buf);
> +	RTE_SET_USED(len);
> +	RTE_SET_USED(offset);
> +	RTE_SET_USED(bar_idx);
> +	return 0;
> +#endif

Maybe you could do that like what pci_map_device() does:

	switch(dev->kdrv) {
	case RTE_KDRV_NIC_VFIO:
		return pci_vfio_read_bar(..);
		break;
	default:
		RTE_LOG(.... not supported by driver: %d\n"..);
		break;
	}

With that, you could get rid of those ugly RTE_SET_USED....

	--yliu