Currently, a channel width change updates the 802.11n HT info data in
net80211 but it doesn't trigger any device changes. So the device
driver may decide that HT40 frames can be transmitted but the last
device channel set only had HT20 set.
Now, a task is scheduled so a hardware reset or change isn't done
during any active ongoing RX. It also means that it's serialised
with the other task operations (eg channel change.)
This isn't the final incantation of this work, see below.
For now, any unmodified drivers will simply receive a channel
change log entry. A subsequent patch to ath(4) will introduce
some basic channel change handling (by resetting the NIC.)
Other NICs may need to update their rate control information.
TODO:
* There's still a small window at the present moment where the
channel width has been updated but the task hasn't been fired.
The final version of this should likely pass in a channel width
field to the driver and let the driver atomically do whatever
it needs to before changing the channel.
PR: kern/166286
adjust the IEEE80211_HTRATE_MAXSIZE constant, only MCS0 - 76 are valid
the other bits in the mcsset IE (77 - 127) are either reserved or used
for TX parameters.
o add a new facility for components to register send+recv handlers
o ieee80211_send_action and ieee80211_recv_action now use the registered
handlers to dispatch operations
o rev ieee80211_send_action api to enable passing arbitrary data
o rev ieee80211_recv_action api to pass the 802.11 frame header as it may
be difficult to locate
o update existing IEEE80211_ACTION_CAT_BA and IEEE80211_ACTION_CAT_HT handling
o update mwl for api rev
Reviewed by: rpaulo
Approved by: re (kensmith)
o correct BAR frame construction for AMPDU
o retransmit BAR frames until ACK'd or timeout (use tunables to
control behaviour, default is very aggressive)
o defer seq# update until BAR frame is ACK'd
o add BAR response handling callback for driver to interpose and
push new state to device or push pending aggregates
While here also:
o add backpointer to node in the per-tid tx aggregation data structure
o move ampdu tx state setup/teardown work to separate functions
o change ieee80211_parse_htcap and ieee80211_parse_htinfo to save only
internal state obtained from the ie's; no dynamic state such as
ni_chw is altered
o add ieee80211_ht_updateparams to parse ht cap+info ie's and update
dynamic node state
o change ieee80211_ht_node_init to not take an htcap ie that is parsed;
instead have the caller make a separate call as one caller wants to
parse the ie while another wants to parse both cap+info ie's and
update state so can better do this with ieee80211_ht_updateparams
These changes fix sta mode state handling where the node's channel
width was shifted to ht20/ht40 prematurely.
o use txa_start to form the addba request and purge txa_seqstart
o fill txa_start before calling ic_addba_request to permit drivers
to override when they handle seq# generation (e.g. mwl)
Note this includes changes to all drivers and moves some device firmware
loading to use firmware(9) and a separate module (e.g. ral). Also there
no longer are separate wlan_scan* modules; this functionality is now
bundled into the wlan module.
Supported by: Hobnob and Marvell
Reviewed by: many
Obtained from: Atheros (some bits)
o add driver callback to handle notification of beacon changes;
this is required for devices that manage beacon frames themselves
(devices must override the default handler which does nothing)
o move beacon update-related flags from ieee80211com to the beacon
offsets storage (or handle however a driver wants)
o expand beacon offsets structure with members needed for 11h/dfs
and appie's
o change calling convention for ieee80211_beacon_alloc and
ieee80211_beacon_update
o add overlapping bss support for 11g; requires driver to pass
beacon frames from overlapping bss up to net80211 which is not
presently done by any driver
o move HT beacon contents update to a routine in the HT code area
Reviewed by: avatar, thompsa, sephe
Approved by: re (blanket wireless)
o major overhaul of the way channels are handled: channels are now
fully enumerated and uniquely identify the operating characteristics;
these changes are visible to user applications which require changes
o make scanning support independent of the state machine to enable
background scanning and roaming
o move scanning support into loadable modules based on the operating
mode to enable different policies and reduce the memory footprint
on systems w/ constrained resources
o add background scanning in station mode (no support for adhoc/ibss
mode yet)
o significantly speedup sta mode scanning with a variety of techniques
o add roaming support when background scanning is supported; for now
we use a simple algorithm to trigger a roam: we threshold the rssi
and tx rate, if either drops too low we try to roam to a new ap
o add tx fragmentation support
o add first cut at 802.11n support: this code works with forthcoming
drivers but is incomplete; it's included now to establish a baseline
for other drivers to be developed and for user applications
o adjust max_linkhdr et. al. to reflect 802.11 requirements; this eliminates
prepending mbufs for traffic generated locally
o add support for Atheros protocol extensions; mainly the fast frames
encapsulation (note this can be used with any card that can tx+rx
large frames correctly)
o add sta support for ap's that beacon both WPA1+2 support
o change all data types from bsd-style to posix-style
o propagate noise floor data from drivers to net80211 and on to user apps
o correct various issues in the sta mode state machine related to handling
authentication and association failures
o enable the addition of sta mode power save support for drivers that need
net80211 support (not in this commit)
o remove old WI compatibility ioctls (wicontrol is officially dead)
o change the data structures returned for get sta info and get scan
results so future additions will not break user apps
o fixed tx rate is now maintained internally as an ieee rate and not an
index into the rate set; this needs to be extended to deal with
multi-mode operation
o add extended channel specifications to radiotap to enable 11n sniffing
Drivers:
o ath: add support for bg scanning, tx fragmentation, fast frames,
dynamic turbo (lightly tested), 11n (sniffing only and needs
new hal)
o awi: compile tested only
o ndis: lightly tested
o ipw: lightly tested
o iwi: add support for bg scanning (well tested but may have some
rough edges)
o ral, ural, rum: add suppoort for bg scanning, calibrate rssi data
o wi: lightly tested
This work is based on contributions by Atheros, kmacy, sephe, thompsa,
mlaier, kevlo, and others. Much of the scanning work was supported by
Atheros. The 11n work was supported by Marvell.
