Re: [PATCH 06/12] net/failsafe: add fail-safe PMD

[Stephen Hemminger <stephen@networkplumber.org>]

On Fri,  3 Mar 2017 16:40:28 +0100
Gaetan Rivet <gaetan.rivet@6wind.com> wrote:

> +
> +static struct rte_eth_dev *
> +pci_addr_to_eth_dev(struct rte_pci_addr *addr)
> +{
> +	uint8_t pid;
> +
> +	if (addr == NULL)
> +		return NULL;
> +	for (pid = 0; pid < RTE_MAX_ETHPORTS; pid++) {
> +		struct rte_pci_addr *addr2;
> +		struct rte_eth_dev *edev;
> +
> +		edev = &rte_eth_devices[pid];
> +		if (edev->device == NULL ||
> +		    edev->device->devargs == NULL)
> +			continue;
> +		addr2 = &edev->device->devargs->pci.addr;
> +		if (rte_eal_compare_pci_addr(addr, addr2) == 0)
> +			return edev;
> +	}
> +	return NULL;
> +}
> +
> +static int
> +pci_scan_one(struct sub_device *sdev)
> +{
> +	struct rte_devargs *da;
> +	char dirname[PATH_MAX];
> +
> +	da = &sdev->devargs;
> +	snprintf(dirname, sizeof(dirname),
> +		"%s/" PCI_PRI_FMT,
> +		pci_get_sysfs_path(),
> +		da->pci.addr.domain,
> +		da->pci.addr.bus,
> +		da->pci.addr.devid,
> +		da->pci.addr.function);
> +	errno = 0;
> +	if (rte_eal_pci_parse_sysfs_entry(&sdev->pci_device,
> +		dirname, &da->pci.addr) < 0) {
> +		if (errno == ENOENT) {
> +			DEBUG("Could not scan requested device " PCI_PRI_FMT,
> +				da->pci.addr.domain,
> +				da->pci.addr.bus,
> +				da->pci.addr.devid,
> +				da->pci.addr.function);
> +		} else {
> +			ERROR("Error while scanning sysfs entry %s",
> +					dirname);
> +			return -1;
> +		}
> +	} else {
> +		sdev->state = DEV_SCANNED;
> +	}
> +	return 0;
> +}

This needs to be generic and in EAL.
A bigger problem is that it PCI specific and therefore won't work in environments
where devices are attached to different busses (SOC and Hyper-V).

Please rework to play well with bus model.