Re: [dpdk-dev] [PATCH 2/6] net/mlx5: fix PCI probing error flow

[Raslan Darawsheh <rasland@nvidia.com>]

Hi,

> -----Original Message-----
> From: Michael Baum <michaelba@nvidia.com>
> Sent: Tuesday, August 31, 2021 11:37 PM
> To: dev@dpdk.org
> Cc: Matan Azrad <matan@nvidia.com>; Raslan Darawsheh
> <rasland@nvidia.com>; Slava Ovsiienko <viacheslavo@nvidia.com>;
> stable@dpdk.org
> Subject: [PATCH 2/6] net/mlx5: fix PCI probing error flow
> 
How about changing to something like this:
Fix memory leak in PCI prob
> In PCI probing, there is internal probe function that is called several times for
> several PFs.
During PCI probe, the internal probe function is called per PF.
> 
> When one of them fails, the previous PFs are not destroyed what may cause
> a memory leak.
If one of them fails, it was missing a prober destroy for the previously probed PFs
> 
> Destroy them.
This fixes the behavior by destroying all previously probed PF's
> 
> Fixes: 08c2772fc747 ("net/mlx5: support list of representor PF")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Michael Baum <michaelba@nvidia.com>
> ---
>  drivers/net/mlx5/linux/mlx5_os.c | 13 ++++++++++++-
>  drivers/net/mlx5/mlx5.c          |  2 +-
>  drivers/net/mlx5/mlx5.h          |  1 +
>  3 files changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/mlx5/linux/mlx5_os.c
> b/drivers/net/mlx5/linux/mlx5_os.c
> index 5f8766aa48..3d204f99f7 100644
> --- a/drivers/net/mlx5/linux/mlx5_os.c
> +++ b/drivers/net/mlx5/linux/mlx5_os.c
> @@ -2700,9 +2700,20 @@ mlx5_os_pci_probe(struct rte_pci_device
> *pci_dev)
> 
>  	if (eth_da.nb_ports > 0) {
>  		/* Iterate all port if devargs pf is range: "pf[0-1]vf[...]". */
> -		for (p = 0; p < eth_da.nb_ports; p++)
> +		for (p = 0; p < eth_da.nb_ports; p++) {
>  			ret = mlx5_os_pci_probe_pf(pci_dev, &eth_da,
>  						   eth_da.ports[p]);
> +			if (ret)
> +				break;
> +		}
> +		if (ret) {
> +			DRV_LOG(ERR, "Probe of PCI device " PCI_PRI_FMT "
> "
> +				"aborted due to proding failure of PF %u",
> +				pci_dev->addr.domain, pci_dev->addr.bus,
> +				pci_dev->addr.devid, pci_dev-
> >addr.function,
> +				eth_da.ports[p]);
> +			mlx5_net_remove(&pci_dev->device);
> +		}
>  	} else {
>  		ret = mlx5_os_pci_probe_pf(pci_dev, &eth_da, 0);
>  	}
> diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c index
> f0ec2d1279..02ea2e781e 100644
> --- a/drivers/net/mlx5/mlx5.c
> +++ b/drivers/net/mlx5/mlx5.c
> @@ -2386,7 +2386,7 @@ mlx5_eth_find_next(uint16_t port_id, struct
> rte_device *odev)
>   * @return
>   *   0 on success, the function cannot fail.
>   */
> -static int
> +int
>  mlx5_net_remove(struct rte_device *dev)  {
>  	uint16_t port_id;
> diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h index
> e02714e231..3581414b78 100644
> --- a/drivers/net/mlx5/mlx5.h
> +++ b/drivers/net/mlx5/mlx5.h
> @@ -1483,6 +1483,7 @@ int mlx5_udp_tunnel_port_add(struct rte_eth_dev
> *dev,
>  			      struct rte_eth_udp_tunnel *udp_tunnel);
> uint16_t mlx5_eth_find_next(uint16_t port_id, struct rte_device *odev);  int
> mlx5_dev_close(struct rte_eth_dev *dev);
> +int mlx5_net_remove(struct rte_device *dev);
>  bool mlx5_is_hpf(struct rte_eth_dev *dev);  bool mlx5_is_sf_repr(struct
> rte_eth_dev *dev);  void mlx5_age_event_prepare(struct
> mlx5_dev_ctx_shared *sh);
> --
> 2.25.1