net: add linux.bootarg parameter from ifup call

This sets a `ip=dhcp` or
`ip=<clientip>:<serverip>:<gatewayip>:<netmaskip>::<iface>:` bootarg for
the network device upon execution of 'ifup'. This is the only point
where we can distinguish between a static ip and a dhcp-based network
setup and thus set a valid bootarg options as it will be required for
nfs boot, for example.

Signed-off-by: Enrico Jorns <ejo@pengutronix.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/eth.c b/net/eth.c
index 6f8e78d8d3..dac2400b81 100644
--- a/net/eth.c
+++ b/net/eth.c
@@ -384,6 +384,8 @@ int eth_register(struct eth_device *edev)
 	dev_add_param_ip(dev, "netmask", NULL, NULL, &edev->netmask, edev);
 	dev_add_param_mac(dev, "ethaddr", eth_param_set_ethaddr, NULL,
 			edev->ethaddr, edev);
+	edev->bootarg = xstrdup("");
+	dev_add_param_string(dev, "linux.bootargs", NULL, NULL, &edev->bootarg, NULL);
 
 	if (edev->init)
 		edev->init(edev);