Re: [PATCH v2] pci: fix check uio bind

["Gaëtan Rivet" <gaetan.rivet@6wind.com>]

On Tue, Oct 24, 2017 at 07:44:53AM +0000, Jianfeng Tan wrote:
> When checking if any devices bound to uio, we did not exclud
> those which are blacklisted (or in the case that a whitelist
> is specified).
> 
> This patch fixes it by only checking whitelisted devices, or
> not-blacklisted devices depending on the bus scan mode.
> 
> Fixes: 815c7deaed2d ("pci: get IOMMU class on Linux")
> 
> Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
Small nit below, but otherwise:

Reviewed-by: Gaetan Rivet <gaetan.rivet@6wind.com>
> ---
> v2:
>   - Accept two suggestions from Gaetan.
> 
>  lib/librte_eal/linuxapp/eal/eal_pci.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
> index b4dbf95..4d1de07 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_pci.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
> @@ -516,8 +516,29 @@ static inline int
>  pci_one_device_bound_uio(void)
>  {
>  	struct rte_pci_device *dev = NULL;
> +	struct rte_devargs *devargs;
> +	int need_check;

Both could have been declared within the loop instead, but this is
really a detail and isn't worth a v3 IMO, so do as you please.

>  
>  	FOREACH_DEVICE_ON_PCIBUS(dev) {
> +		devargs = dev->device.devargs;
> +
> +		need_check = 0;
> +		switch (rte_pci_bus.bus.conf.scan_mode) {
> +		case RTE_BUS_SCAN_WHITELIST:
> +			if (devargs && devargs->policy == RTE_DEV_WHITELISTED)
> +				need_check = 1;
> +			break;
> +		case RTE_BUS_SCAN_UNDEFINED:
> +		case RTE_BUS_SCAN_BLACKLIST:
> +			if (devargs == NULL ||
> +			    devargs->policy != RTE_DEV_BLACKLISTED)
> +				need_check = 1;
> +			break;
> +		}
> +
> +		if (!need_check)
> +			continue;
> +
>  		if (dev->kdrv == RTE_KDRV_IGB_UIO ||
>  		   dev->kdrv == RTE_KDRV_UIO_GENERIC) {
>  			return 1;
> -- 
> 2.7.4
> 

-- 
Gaëtan Rivet
6WIND