Do the first adjustments in the client-side code to pass
the link pointer (instead of sdata) to most places etc.

This is just preparation, so the real MLO patches become
smaller.

Note that this isn't complete, notably there are still
quite a few references to sta->deflink and sta->sta.deflink.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Remove the IEEE80211_STA_RESET_SIGNAL_AVE flag and use
a bool instead, but invert the polarity (now calling it
tracking_signal_avg) so we don't have to initialize it,
and put that into the link instead.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

To prepare a bit more for MLO in the client code,
track the AP's address (for now only the BSSID, but
will track the AP MLD's address later) separately
from the per-link BSSID.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

This variable is only written to, remove it.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Take the link into account in the QoS settings (EDCA parameters)
APIs.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

In MLO, expect the driver fully handles powersave handling,
including tracking whether or not a beacon was received,
the DTIM period, etc.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

This really shouldn't be in a per-link config, we don't want
to let anyone control it that way (if anything, link powersave
could be forced through APIs to activate/deactivate a link),
and we don't support powersave in software with devices that
can do MLO.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

It might be useful to drivers to be able to pass only the
link_conf pointer, rather than both the pointer and the
link_id; add the link_id to the link_conf to facility that.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

In station/client mode, the link data needs a bit more
initialization and destruction than just zero-init and
kfree() respectively, implement that.

This required some shuffling of the link data handling
in general, as we should set it up in setup and do the
teardown in teardown, otherwise we're asymmetric in
case of interface type changes.

Also stop using kfree_rcu(), we cannot guarantee that
nothing is scheduling things that live within the link
(e.g. the u.mgd.request_smps_work) until we're sure it
cannot be referenced anymore, therefore synchronize
instead. This isn't very efficient, but we can always
optimize it later.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

This function can be static.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

At least the quantenna driver calls wdev_chandef() here
which now requires the lock, so acquire it.

Fixes: 7b0a0e3c ("wifi: cfg80211: do some rework towards MLO link APIs")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

With the split into keys[]/deflink.gtk[] arrays, WEP keys are
still installed into the keys[] array, but we didn't look them
up there. This meant they weren't deleted correctly.

Fix this by looking up the key there even if it's not pairwise
so we can be sure we don't have it.

Fixes: bfd8403a ("wifi: mac80211: reorg some iface data structs for MLD")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Separate out the connection downgrade flags from the ifmgd->flags
and put them into the link information instead. While at it, make
them a separate sparse type so we don't get confused about where
they belong and have static checking on correct handling.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Align the mac80211 implementation with P802.11be_D2.0.
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Align the mac80211 implementation with P802.11be_D1.5.
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

There are a few places that check ps_sdata and/or the dynamic
PS timeout, but they're erroneous in case SUPPORTS_DYNAMIC_PS
is set by the driver.

Skip the entire recalculation in this case so we cannot get
into those paths elsewhere, and so we simplify this for the
purpose of implementing MLO.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

If we don't really have multiple links, omit the link ID from
link debug prints, otherwise we change the format for all of
the existing drivers (most of which might never support MLO),
and also have extra noise in the logs.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Do address matching with link addresses as well.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

For multi-link operation, this cannot work as the req->bss pointer
will be NULL, and we'll need to do more work on this to really add
tracing for the MLO case here. Drop the BSS elements for now as
they're not the most useful thing, and it's hard to size things
correctly for the MLO case (without adding a lot of code that's
also executed when tracing isn't enabled.)
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

We might assign -1 to it in some cases when key is NULL,
which means the key_idx isn't used but can lead to a
warning from static checkers such as smatch.

Make the struct member signed simply to avoid that, we
only need a range of -1..3 anyway.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Since for an MLD station the default link is added together
with the add station command, allow also setting the link
MAC address.
Otherwise, it is needed to use the modify link API only
for setting the link MAC address.
Signed-off-by: Shaul Triebitz <shaul.triebitz@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Since links can be added and removed dynamically, we need to
somehow protect the sdata->link[] and vif->link_conf[] array
pointers from disappearing when accessing them without locks.
RCU-ify the pointers to achieve this, which requires quite a
bit of rework.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Since this will need to refer - at least in part - to the link
stations of an MLD, hold the wdev mutex for driver convenience.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Since we deal with links in an MLD here, hold the wdev
mutex now.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Since we deal with links, and that requires looking at wdev links,
we should hold the wdev mutex for driver convenience.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Implement callbacks for cfg80211 add_link_station, mod_link_station,
and del_link_station API.
Signed-off-by: Shaul Triebitz <shaul.triebitz@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Put the link_station_parameters structure in the station_parameters
structure (and remove the station_parameters fields already existing
in link_station_parameters).
Now, for an MLD station, the default link is added together with
the station.
Signed-off-by: Shaul Triebitz <shaul.triebitz@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Add an API for adding/modifying/removing a link of a station.
Signed-off-by: Shaul Triebitz <shaul.triebitz@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Similar to ieee80211_get_sband but get the sband of the link_conf.
Signed-off-by: Shaul Triebitz <shaul.triebitz@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

AP SMPS was removed and not needed anymore. Remove the leftovers.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Management frames are transmitted from link address and not device
address. Allow that.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Check all the MLO links to decide whether offchannel TX is needed.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

When checking whether or not to accept a frame in RX,
take into account the configured link addresses. Also
look up the link station correctly.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Instead of open-coding it, use sdata_dereference().
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Accept frames from all the links' channels.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

ieee80211s_update_metric function uses sta_set_rate_info_tx
function to get struct rate_info data from ieee80211_tx_rate
struct, present in ieee80211_sta->deflink.tx_stats. However,
drivers can skip tx rate calculation by setting rate idx as
-1. Such drivers provides rate_info directly and hence
ieee80211s metric is updated incorrectly since ieee80211_tx_rate
has inconsistent data.

Add fix to use rate_info directly if present instead of
sta_set_rate_info_tx for updating ieee80211s metric.
Signed-off-by: Aditya Kumar Singh <quic_adisi@quicinc.com>
Link: https://lore.kernel.org/r/20220701133611.544-1-quic_adisi@quicinc.comSigned-off-by: Johannes Berg <johannes.berg@intel.com>

WDS needs 4addr packets to trigger AP for wlan0.sta creation.
However, the 4addr null frame is sent at a high rate so that
sometimes the AP can't receive it. Switch to using min rate.
Signed-off-by: Lian Chen <lian.chen@mediatek.com>
Link: https://lore.kernel.org/r/20220714091636.59107-1-lian.chen@mediatek.comSigned-off-by: Johannes Berg <johannes.berg@intel.com>

The strlcpy should not be used because it doesn't limit the source
length. Preferred is strscpy.
Signed-off-by: XueBing Chen <chenxuebing@jari.cn>
Link: https://lore.kernel.org/r/2d2fcbf7.e33.181eda8e70e.Coremail.chenxuebing@jari.cnSigned-off-by: Johannes Berg <johannes.berg@intel.com>

In AP mode, multicast traffic is handled very differently from normal traffic,
especially if at least one client is in powersave mode.
This means that multicast packets can be buffered a lot longer than normal
unicast packets, and can eat up the AQL budget very quickly because of the low
data rate.
Along with the recent change to maintain a global PHY AQL limit, this can lead
to significant latency spikes for unicast traffic.

Since queueing multicast to hardware is currently not constrained by AQL limits
anyway, let's just exclude it from the AQL pending airtime calculation entirely.

Fixes: 8e4bac06 ("wifi: mac80211: add a per-PHY AQL limit to improve fairness")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20220713083444.86129-1-nbd@nbd.nameSigned-off-by: Johannes Berg <johannes.berg@intel.com>

We won't really have enough skbs to need a 64-bit cookie,
and on 32-bit platforms storing the 64-bit cookie into the
void *rate_driver_data doesn't work anyway. Switch back to
using just a 32-bit cookie and uintptr_t for the type to
avoid compiler warnings about all this.

Fixes: 4ee186fa ("wifi: mac80211_hwsim: fix race condition in pending packet")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>