linux.git/net/mac80211/debugfs_netdev.c, branch v6.12.80

wifi: mac80211: prohibit deactivating all links

2025-02-08T08:57:14+00:00

[ Upstream commit 7553477cbfd784b128297f9ed43751688415bbaa ]

In the internal API this calls this is a WARN_ON, but that
should remain since internally we want to know about bugs
that may cause this. Prevent deactivating all links in the
debugfs write directly.

Reported-by: syzbot+0c5d8e65f23569a8ffec@syzkaller.appspotmail.com
Fixes: 3d9011029227 ("wifi: mac80211: implement link switching")
Signed-off-by: Johannes Berg 
Link: https://patch.msgid.link/20241230091408.505bd125c35a.Ic3c1f9572b980a952a444cad62b09b9c6721732b@changeid
Signed-off-by: Johannes Berg 
Signed-off-by: Sasha Levin

wifi: mac80211: fix driver debugfs for vif type change

2024-02-02T12:09:55+00:00

If a driver implements the change_interface() method, we switch
interface type without taking the interface down, but still will
recreate the debugfs for it since it's a new type. As such, we
should use the ieee80211_debugfs_recreate_netdev() function here
to also recreate the driver's files, if it is indeed from a type
change while up.

Link: https://msgid.link/20240129155402.7311a36ffeeb.I18df02bbeb685d4250911de5ffbaf090f60c3803@changeid
Signed-off-by: Johannes Berg

wifi: mac80211: add/remove driver debugfs entries as appropriate

2023-12-19T12:08:00+00:00

When an interface is removed, we should also be deleting the driver
debugfs entries (as it might still exist in DOWN state in mac80211). At
the same time, when adding an interface, we can check the
IEEE80211_SDATA_IN_DRIVER flag to know whether the interface was
previously known to the driver and is simply being reconfigured.

Fixes: a1f5dcb1c0c1 ("wifi: mac80211: add a driver callback to add vif debugfs")
Signed-off-by: Benjamin Berg 
Reviewed-by: Gregory Greenman 
Signed-off-by: Miri Korenblit 
Link: https://msgid.link/20231220043149.a9f64c359424.I7076526b5297ae8f832228079c999f7b8e147a4c@changeid
Signed-off-by: Johannes Berg

wifi: mac80211: use wiphy locked debugfs for sdata/link

2023-11-27T10:25:09+00:00

The debugfs files for netdevs (sdata) and links are removed
with the wiphy mutex held, which may deadlock. Use the new
wiphy locked debugfs to avoid that.

Signed-off-by: Johannes Berg

wifi: mac80211: Rename and update IEEE80211_VIF_DISABLE_SMPS_OVERRIDE

2023-10-23T09:43:27+00:00

EMLSR operation and SMPS operation cannot coexist. Thus, when EMLSR is
enabled, all SMPS signaling towards the AP should be stopped (it is
expected that the AP will consider SMPS to be off).

Rename IEEE80211_VIF_DISABLE_SMPS_OVERRIDE to IEEE80211_VIF_EML_ACTIVE
and use the flag as an indication from the driver that EMLSR is enabled.
When EMLSR is enabled SMPS flows towards the AP MLD should be stopped.

Signed-off-by: Ilan Peer 
Signed-off-by: Gregory Greenman 
Link: https://lore.kernel.org/r/20230928172905.fb2c2f9a0645.If6df5357568abd623a081f0f33b07e63fb8bba99@changeid
Signed-off-by: Johannes Berg

wifi: mac80211: handle debugfs when switching to/from MLO

2023-10-23T09:43:26+00:00

In MLO, we have a per-link debugfs directory which contains the
per-link files. In case of non-MLO we would like to put the per-link
files in the netdev directory to keep it how it was before MLO.

- Upon interface creation the netdev will be created with the per-link
  files in it.
- Upon switching to MLO: delete the entire netdev directory and then
  recreate it without the per-link files. Then the per-link directories
  with the per-link files in it will be created in ieee80211_link_init()
- Upon switching to non-MLO: delete the entire netdev directory
  (including the per-link directories) and recreate it with the per-link
  files in it.

Note that this also aligns to always call the vif link debugfs
method for the deflink as promised in the documentation, which
wasn't done before.

Signed-off-by: Miri Korenblit 
Signed-off-by: Johannes Berg 
Signed-off-by: Gregory Greenman 
Link: https://lore.kernel.org/r/20230928172905.082e698caca9.I5bef7b2026e0f58b4a958b3d1f459ac5baeccfc9@changeid
Signed-off-by: Johannes Berg

wifi: cfg80211: remove wdev mutex

2023-09-11T09:27:23+00:00

Since we're now protecting everything with the wiphy mutex
(and were really using it for almost everything before),
there's no longer any real reason to have a separate wdev
mutex. It may feel better, but really has no value.

Signed-off-by: Johannes Berg

wifi: mac80211: hold wiphy lock in netdev/link debugfs

2023-09-11T09:27:18+00:00

It's no longer really needed to ensure that the debugfs
file isn't going away, debugfs handles that. So there's
no point in holding dev_base_lock or RTNL here, but we
should instead hold the wiphy lock since drivers will
be allowed to depend on that. Do that, which requires
splitting the sdata and link macros a bit.

Signed-off-by: Johannes Berg

wifi: mac80211: Add debugfs entry to report dormant links

2023-06-19T10:05:19+00:00

Add debugfs entry to report dormant (valid but disabled) links.

Signed-off-by: Ilan Peer 
Signed-off-by: Gregory Greenman 
Link: https://lore.kernel.org/r/20230611121219.7fa5f022adfb.Iff6fa3e1a3b00ae726612f9d5a31f7fe2fcbfc68@changeid
Signed-off-by: Johannes Berg

wifi: mac80211: Fix permissions for valid_links debugfs entry

2023-06-14T10:31:55+00:00

The entry should be a read only one and not a write only one. Fix it.

Fixes: 3d9011029227 ("wifi: mac80211: implement link switching")
Signed-off-by: Ilan Peer 
Signed-off-by: Gregory Greenman 
Link: https://lore.kernel.org/r/20230611121219.c75316990411.I1565a7fcba8a37f83efffb0cc6b71c572b896e94@changeid
[remove x16 change since it doesn't work yet]
Signed-off-by: Johannes Berg