Re: [dpdk-dev] [PATCH] net/thunderx: manage PCI device mapping for SQS VFs

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 6/1/2017 2:05 PM, Jerin Jacob wrote:
> Since the commit e84ad157b7bc ("pci: unmap resources if probe fails"),
> EAL unmaps the PCI device if ethdev probe returns positive or
> negative value.
> 
> nicvf thunderx PMD needs special treatment for Secondary queue set(SQS)
> PCIe VF devices, where, it expects to not unmap or free the memory
> without registering the ethdev subsystem.
> 
> To keep the same behavior, moved the PCI map function inside
> the driver without using the EAL services.

What do you think adding a flag something like
RTE_PCI_DRV_FIXED_MAPPING? Does mapping but not unmap on error.
This would be more generic solution.

I am concerned about calling eal level API from PMD.

> 
> Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
> Signed-off-by: Angela Czubak <aczubak@caviumnetworks.com>
> ---
>  drivers/net/thunderx/nicvf_ethdev.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/thunderx/nicvf_ethdev.c b/drivers/net/thunderx/nicvf_ethdev.c
> index 796701b0f..6ec2f9266 100644
> --- a/drivers/net/thunderx/nicvf_ethdev.c
> +++ b/drivers/net/thunderx/nicvf_ethdev.c
> @@ -2025,6 +2025,13 @@ nicvf_eth_dev_init(struct rte_eth_dev *eth_dev)
>  	}
>  
>  	pci_dev = RTE_ETH_DEV_TO_PCI(eth_dev);
> +
> +	ret = rte_pci_map_device(pci_dev);
> +	if (ret) {
> +		PMD_INIT_LOG(ERR, "Failed to map pci device");
> +		goto fail;
> +	}
> +
>  	rte_eth_copy_pci_info(eth_dev, pci_dev);
>  
>  	nic->device_id = pci_dev->id.device_id;
> @@ -2171,7 +2178,7 @@ static int nicvf_eth_pci_remove(struct rte_pci_device *pci_dev)
>  
>  static struct rte_pci_driver rte_nicvf_pmd = {
>  	.id_table = pci_id_nicvf_map,
> -	.drv_flags = RTE_PCI_DRV_NEED_MAPPING | RTE_PCI_DRV_INTR_LSC,
> +	.drv_flags = RTE_PCI_DRV_INTR_LSC,
>  	.probe = nicvf_eth_pci_probe,
>  	.remove = nicvf_eth_pci_remove,
>  };
>