Re: Fwd: [PATCHv2 1/1] RDMA/rxe: Disable ipv6 features when ipv6.disable set in cmdline

[Jason Gunthorpe <jgg@nvidia.com>]

On Sun, Mar 07, 2021 at 12:59:07AM +0800, Zhu Yanjun wrote:
> From: Zhu Yanjun <zyjzyj2000@gmail.com>
> 
> When ipv6.disable=1 is set in cmdline, ipv6 is actually disabled
> in the stack. As such, the operations of ipv6 in RXE will fail.
> So ipv6 features in RXE should also be disabled in RXE.
> 
> Fixes: 8700e3e7c4857 ("Soft RoCE driver")
> Reported-by: Yi Zhang <yi.zhang@redhat.com>
> Signed-off-by: Zhu Yanjun <zyjzyj2000@gmail.com>
> Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
> Tested-by: Yi Zhang <yi.zhang@redhat.com>
> V1->V2: Modify the pr_info messages
>  drivers/infiniband/sw/rxe/rxe_net.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/infiniband/sw/rxe/rxe_net.c
> b/drivers/infiniband/sw/rxe/rxe_net.c
> index 0701bd1ffd1a..6ef092cb575e 100644
> +++ b/drivers/infiniband/sw/rxe/rxe_net.c
> @@ -72,6 +72,11 @@ static struct dst_entry *rxe_find_route6(struct
> net_device *ndev,
>         struct dst_entry *ndst;
>         struct flowi6 fl6 = { { 0 } };
> 
> +       if (!ipv6_mod_enabled()) {
> +               pr_info("IPv6 is disabled");
> +               return NULL;
> +       }

Why doesn't a similar touch of ipv6_stub in
drivers/infiniband/core/addr.c need a similar protection?

Also do not print.

Jason