Re: [PATCHv2 net-next 2/3] bonding: use correct return value

[Toke Høiland-Jørgensen]

Hangbin Liu <liuhangbin@xxxxxxxxx> writes:

> When a slave already has an XDP program loaded, the correct return value
> should be -EEXIST instead of -EOPNOTSUPP.
>
> Fixes: 9e2ee5c7e7c3 ("net, bonding: Add XDP support to the bonding driver")
> Reviewed-by: Nikolay Aleksandrov <razor@xxxxxxxxxxxxx>
> Signed-off-by: Hangbin Liu <liuhangbin@xxxxxxxxx>
> ---
>  drivers/net/bonding/bond_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index f0f76b6ac8be..6887a867fe8b 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -5699,7 +5699,7 @@ static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog,
>  		if (dev_xdp_prog_count(slave_dev) > 0) {
>  			SLAVE_NL_ERR(dev, slave_dev, extack,
>  				     "Slave has XDP program loaded, please unload before enslaving");
> -			err = -EOPNOTSUPP;
> +			err = -EEXIST;

Hmm, this has been UAPI since kernel 5.15, so can we really change it
now? What's the purpose of changing it, anyway?

-Toke