Re: [PATCH net-next] switchdev: fix handling for drivers not supporting IPv4 fib add/del ops

[Florian Fainelli <f.fainelli@gmail.com>]

On 10/06/15 17:04, sfeldma@gmail.com wrote:
> From: Scott Feldman <sfeldma@gmail.com>
> 
> If CONFIG_NET_SWITCHDEV is enabled, but port driver does not implement
> support for IPv4 FIB add/del ops, don't fail route add/del offload
> operations.  Route adds will not be marked as OFFLOAD.  Routes will be
> installed in the kernel FIB, as usual.
> 
> This was report/fixed by Florian when testing DSA driver with net-next on
> devices with L2 offload support but no L3 offload support. What he reported
> was an initial route installed from DHCP client would fail (route not
> installed to kernel FIB).  This was triggering the setting of
> ipv4.fib_offload_disabled, which would disable route offloading after the
> first failure.  So subsequent attempts to install the route would succeed.
> 
> There is follow-on work/discussion to address the handling of route install
> failures, but for now, let's differentiate between no support and failed
> support.
> 
> Reported-by: Florian Fainelli <f.fainelli@gmail.com>
> Signed-off-by: Scott Feldman <sfeldma@gmail.com>

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

> ---
>  net/switchdev/switchdev.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
> index 99bced4..28637e9 100644
> --- a/net/switchdev/switchdev.c
> +++ b/net/switchdev/switchdev.c
> @@ -853,7 +853,7 @@ int switchdev_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
>  	if (!err)
>  		fi->fib_flags |= RTNH_F_OFFLOAD;
>  
> -	return err;
> +	return err == -EOPNOTSUPP ? 0 : err;
>  }
>  EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_add);
>  
> @@ -898,7 +898,7 @@ int switchdev_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi,
>  	if (!err)
>  		fi->fib_flags &= ~RTNH_F_OFFLOAD;
>  
> -	return err;
> +	return err == -EOPNOTSUPP ? 0 : err;
>  }
>  EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_del);
>  
> 


-- 
Florian