[dpdk-dev] [PATCH] net/mlx5: use PCI BDF as the port name

[Ferruh Yigit]

On 1/22/2018 9:30 AM, Yuanhan Liu wrote:
> It is suggested to use PCI BDF to identify a port for port addition
> in OVS-DPDK. While mlx5 has its own naming style: name it by ib dev
> name. This breaks the typical OVS DPDK use case and brings more puzzle
> to the end users.
> 
> To fix it, this patch changes it to use PCI BDF as the name, too.
> Also, a postfix " port %u" is added, just in case their might be more
> than 1 port assoicated with a PCI device.
> 
> Signed-off-by: Yuanhan Liu <yliu at fridaylinux.org>

<...>

> @@ -633,14 +635,15 @@ mlx5_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
>  			.inline_max_packet_sz = MLX5_ARG_UNSET,
>  		};
>  
> +		len = snprintf(name, sizeof(name), PCI_PRI_FMT,
> +			 pci_dev->addr.domain, pci_dev->addr.bus,
> +			 pci_dev->addr.devid, pci_dev->addr.function);
> +		if (device_attr.orig_attr.phys_port_cnt > 1)
> +			snprintf(name + len, sizeof(name), " port %u", i);

Getting a build error [1] with icc [2].

Because commit 9a761de8ea14 ("net/mlx5: flow counter support") adds variable
"device_attr" into loop scope, but there is already a variable with same name in
function scope.
In this case the variable in the loop scope should be used and compiler error
looks correct, not sure why others compilers not complain about it.

[1]
.../dpdk/drivers/net/mlx5/mlx5.c(729): error #592: variable "device_attr" is
used before its value is set
                if (device_attr.orig_attr.phys_port_cnt > 1)

                    ^

[2]
icc (ICC) 18.0.1 20171018