On Fri, 06 Apr 2018 15:16:39 +0200, Sascha Hauer wrote:
> For network boot we once used to hardcode eth0, but in latest changes
> this was changed to work with different network devices and the 'ifup
> eth0' was replaced with 'ifup -a' which lead to the result that we now
> detect all devices in order to eventually also bring up USB network
> adapters. In most of the cases this is not desired. When a board has
> internal network support this is likely to be used. With this patch
> we only detect all devices when we do not have a network device already.
> For the unusual case in which a USB network adapter shall be used
> even when an internal network interface is present we introduce the
> global variable "global.net.ifup_force_detect" which can be used to
> force detection of devices.
>
> Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Tested-by: Michael Tretter <m.tretter@xxxxxxxxxxxxxx>
Michael
> ---
> net/ifup.c | 21 ++++++++++++++++++++-
> 1 file changed, 20 insertions(+), 1 deletion(-)
>
> diff --git a/net/ifup.c b/net/ifup.c
> index 827c5c03d1..d550f82530 100644
> --- a/net/ifup.c
> +++ b/net/ifup.c
> @@ -28,6 +28,9 @@
> #include <globalvar.h>
> #include <string.h>
> #include <driver.h>
> +#include <init.h>
> +#include <globalvar.h>
> +#include <magicvar.h>
> #include <linux/stat.h>
>
> static int eth_discover(char *file)
> @@ -245,6 +248,8 @@ int ifup(const char *ethname, unsigned flags)
> return ifup_edev(edev, flags);
> }
>
> +static int net_ifup_force_detect;
> +
> int ifup_all(unsigned flags)
> {
> struct eth_device *edev;
> @@ -266,7 +271,9 @@ int ifup_all(unsigned flags)
>
> closedir(dir);
>
> - device_detect_all();
> + if ((flags & IFUP_FLAG_FORCE) || net_ifup_force_detect ||
> + list_empty(&netdev_list))
> + device_detect_all();
>
> for_each_netdev(edev)
> ifup_edev(edev, flags);
> @@ -274,6 +281,18 @@ int ifup_all(unsigned flags)
> return 0;
> }
>
> +static int ifup_all_init(void)
> +{
> + globalvar_add_simple_bool("net.ifup_force_detect", &net_ifup_force_detect);
> +
> + return 0;
> +}
> +late_initcall(ifup_all_init);
> +
> +BAREBOX_MAGICVAR_NAMED(global_net_ifup_force_detect,
> + global.net.ifup_force_detect,
> + "net: force detection of devices on ifup -a");
> +
> #if IS_ENABLED(CONFIG_NET_CMD_IFUP)
>
> static int do_ifup(int argc, char *argv[])
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