Re: [PATCH v2 2/2] bus/pci: fix secondary process save 'FD' problem

[fengchengwen <fengchengwen@huawei.com>]

Hi,

The pci_uio_alloc_resource in drivers/bus/pci/bsd should also modified.

How about add subfunction: pci_uio_init_intr() which includes access/rte_intr_fd_set/rte_intr_fd_get/rte_intr_type_set?

Thanks

On 2024/1/29 17:22, Chaoyong He wrote:
> From: Zerun Fu <zerun.fu@corigine.com>
> 
> In the previous logic the 'fd' was only saved in the primary process,
> but for some devices this value is also used in the secondary logic.
> 
> For example, the call of 'rte_pci_find_ext_capability()' will fail in
> the secondary process.
> 
> Fix this problem by getting and saving the value of 'fd' also in the
> secondary process logic.
> 
> Fixes: 9b957f378abf ("pci: merge uio functions for linux and bsd")
> Cc: mukawa@igel.co.jp
> Cc: stable@dpdk.org
> 
> Signed-off-by: Zerun Fu <zerun.fu@corigine.com>
> Reviewed-by: Chaoyong He <chaoyong.he@corigine.com>
> Reviewed-by: Long Wu <long.wu@corigine.com>
> Reviewed-by: Peng Zhang <peng.zhang@corigine.com>
> ---
>  drivers/bus/pci/linux/pci_uio.c  | 5 ++++-
>  drivers/bus/pci/pci_common_uio.c | 8 ++++----
>  2 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/bus/pci/linux/pci_uio.c b/drivers/bus/pci/linux/pci_uio.c
> index 97d740dfe5..6680e42efb 100644
> --- a/drivers/bus/pci/linux/pci_uio.c
> +++ b/drivers/bus/pci/linux/pci_uio.c
> @@ -237,7 +237,7 @@ pci_uio_alloc_resource(struct rte_pci_device *dev,
>  	}
>  	snprintf(devname, sizeof(devname), "/dev/uio%u", uio_num);
>  
> -	/* save fd if in primary process */
> +	/* save fd */
>  	fd = open(devname, O_RDWR);
>  	if (fd < 0) {
>  		RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
> @@ -261,6 +261,9 @@ pci_uio_alloc_resource(struct rte_pci_device *dev,
>  	if (rte_intr_dev_fd_set(dev->intr_handle, uio_cfg_fd))
>  		goto error;
>  
> +	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
> +		return 0;
> +
>  	if (dev->kdrv == RTE_PCI_KDRV_IGB_UIO) {
>  		if (rte_intr_type_set(dev->intr_handle, RTE_INTR_HANDLE_UIO))
>  			goto error;
> diff --git a/drivers/bus/pci/pci_common_uio.c b/drivers/bus/pci/pci_common_uio.c
> index fcd8a49daf..b6f79b067d 100644
> --- a/drivers/bus/pci/pci_common_uio.c
> +++ b/drivers/bus/pci/pci_common_uio.c
> @@ -122,15 +122,15 @@ pci_uio_map_resource(struct rte_pci_device *dev)
>  	if (rte_intr_dev_fd_set(dev->intr_handle, -1))
>  		return -1;
>  
> -	/* secondary processes - use already recorded details */
> -	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
> -		return pci_uio_map_secondary(dev);
> -
>  	/* allocate uio resource */
>  	ret = pci_uio_alloc_resource(dev, &uio_res);
>  	if (ret)
>  		return ret;
>  
> +	/* secondary processes - use already recorded details */
> +	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
> +		return pci_uio_map_secondary(dev);
> +
>  	/* Map all BARs */
>  	for (i = 0; i != PCI_MAX_RESOURCE; i++) {
>  		/* skip empty BAR */
>