kernel/linux.git/net/mac80211/chan.c, branch v6.2

wifi: mac80211: isolate driver from inactive links

2022-09-06T08:12:44+00:00

In order to let the driver select active links and properly make multi-link connections, as a first step isolate the driver from inactive links, and set the active links to be only the association link for client-side interfaces. For AP side nothing changes since APs always have to have all their links active. To simplify things, update the for_each_sta_active_link() API to include the appropriate vif pointer. This also implies not allocating a chanctx for an inactive link, which requires a few more changes. Since we now no longer try to program multiple links to the driver, remove the check in the MLME code. Signed-off-by: Johannes Berg

wifi: mac80211: replace link_id with link_conf in switch/(un)assign_vif_chanctx()

2022-07-15T09:43:20+00:00

Since mac80211 already has a protected pointer to link_conf, pass it to the driver to avoid additional RCU locking. Signed-off-by: Gregory Greenman Signed-off-by: Johannes Berg

wifi: mac80211: don't check carrier in chanctx code

2022-07-15T09:43:20+00:00

We check here that we don't enable TX (netif_carrier_ok()) before we actually start using some channel context, but to our knowledge this check has never triggered, and with MLO it's just wrong since links can be added and removed much more dynamically than before. Simply remove the checks, there's no really good way to do anything that would replace them. Signed-off-by: Andrei Otcheretianski Signed-off-by: Johannes Berg

wifi: mac80211: tighten locking check

2022-07-15T09:43:19+00:00

When we remove a link that doesn't have a channel context, we don't really need the local->mtx locking. Tighten the check here. Signed-off-by: Johannes Berg

wifi: mac80211: mlme: first adjustments for MLO

2022-07-15T09:43:16+00:00

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

wifi: mac80211: RCU-ify link/link_conf pointers

2022-07-15T09:43:14+00:00

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

wifi: mac80211: RCU-ify link STA pointers

2022-06-20T10:57:08+00:00

We need to be able to access these in a race-free way under traffic while adding/removing them, so RCU-ify the pointers. This requires passing a link_sta to a lot of functions so we don't have to do the RCU handling everywhere. Signed-off-by: Johannes Berg

wifi: mac80211: make channel context code MLO-aware

2022-06-20T10:55:15+00:00

Make the channel context code MLO aware, along with some functions that it uses, so that the chan.c file is now MLD-clean and no longer uses deflink/bss_conf/etc. Signed-off-by: Johannes Berg

wifi: mac80211: split bss_info_changed method

2022-06-20T10:55:09+00:00

Split the bss_info_changed method to vif_cfg_changed and link_info_changed, with the latter getting a link ID. Also change the 'changed' parameter to u64 already, we know we need that. Signed-off-by: Johannes Berg

wifi: mac80211: reorg some iface data structs for MLD

2022-06-20T10:55:06+00:00

Start reorganizing interface related data structures toward MLD. The most complex part here is for the keys, since we have to split the various kinds of GTKs off to the link but still need to use (for WEP) the other keys as a fallback even for multicast frames. Signed-off-by: Johannes Berg