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net: an interface that appears after boot starts the stack

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With the native r8169 out of the registry, the TUF A15 boots with no
network device; netinit() saw none and left the stack off, and
net_attach_late() then refused every interface that came later -- its
comment assumed netinit() was still to run. Linux's r8169 under LDLS
got as far as registering ldls0 and was turned away. A late interface
now starts the stack, whose first act is to attach every device there
is; net_eth_attach() refuses a device it already has, for the window
in which both could offer it.

LDLS says which refusal it got: EBUSY is another process, anything else
is the kernel.

Tested in QEMU with -nic none and netecho: no interface at boot, then
ldls0 with a DHCP lease and ping answered.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
This commit is contained in:
Nexoniarz 2026-10-25 15:38:06 +01:00
commit a9d2e14004
3 changed files with 21 additions and 4 deletions
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12
kernel/net/net.c
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@ -194,8 +194,16 @@ net_attach_late(struct device *d)
{
int idx;
if (!net_ready)
return -1; // netinit() has not run; it will pick this up
// No stack yet. Either netinit() is still to run, or it ran on a machine
// with no network device and left the stack off -- which is every boot
// now that the laptop's RTL8168 is driven by a process (LDLS) that only
// appears later. Start it: net_thread's first act is to attach every
// network device there is, and that now includes this one.
if (!net_ready) {
if (!net_started)
netinit();
return net_started ? 0 : -1;
}
lwip_sys_lock();
idx = net_eth_attach(d);