wlan - Sync netproto/802_11 from FreeBSD part 1/N

* Sync netproto/802_11 from FreeBSD, fbsd git dd885b9a0a0e, May 11 2016.

80211 - Update up to FreeBSD's r287029 (only skipping a few minor changes)

Taken-From: FreeBSD

wlan - Update wlan from Adrian / FreeBSD

* Update the wlan infrastructure, initially working with ath.

wlan/atheros - Remove debugging

* Remove left-over debug kprintf.

wlan/atheros - Synchronize sleep state code from FreeBSD

* Synchronize Adrian Chadd's sleep state code and wlan updates.

* With this commit if the wlan or ath interface is in a 'down' state,
it w

wlan/atheros - Synchronize sleep state code from FreeBSD

* Synchronize Adrian Chadd's sleep state code and wlan updates.

* With this commit if the wlan or ath interface is in a 'down' state,
it will use full sleep mode and save power.

* We get all of ATH through today but the 802_11 changes are a bit
too substantial so this commit only brings in the sleep state code
through today (3-May-2014).

* There is a bunch of other 802_11 work that needs to be brought in
but it's like 20,000 lines of patches so... not today.

* Verified operational on Acer C720 chromebook. full-sleep mode saves
0.3-0.4W. Network sleep mode code is also verified to be operational
but does not appear to save any power at the moment.

Also verified: beacons are working properly for wakeups on packet
reception.

show more ...

altq: Add byte based limit and counter

- This avoids having too much mbufs sitting on the send queue for TSO
capable devices. Even by default, DragonFly has already limited TSO
burst to at most

altq: Add byte based limit and counter

- This avoids having too much mbufs sitting on the send queue for TSO
capable devices. Even by default, DragonFly has already limited TSO
burst to at most 4 TCP segments, for TSO capable devices, there still
could be 4 times mbufs sitting on the send queue compared with non-TSO
capable devices.
- This paves way for the AQMs, which require send queue byte counter,
e.g. CoDel.

For ethernet devices, the byte based limit is (1514 x max_packets).

For other devices, e.g. pseudo devices, the byte based limit is
(MCLBYTES x max_packets).

show more ...

if: Multiple TX queue support step 1 of many; introduce ifaltq subqueue

Put the plain queue information, e.g. queue header and tail, serializer,
packet staging scoreboard and ifnet.if_start schedule

if: Multiple TX queue support step 1 of many; introduce ifaltq subqueue

Put the plain queue information, e.g. queue header and tail, serializer,
packet staging scoreboard and ifnet.if_start schedule netmsg etc. into
its own structure (subqueue). ifaltq structure could have multiple of
subqueues based on the count that drivers can specify.

Subqueue's enqueue, dequeue, purging and states updating are protected
by the subqueue's serializer, so for hardwares supporting multiple TX
queues, contention on queuing operation could be greatly reduced.

The subqueue is passed to if_start to let the driver know which hardware
TX queue to work on. Only the related driver's TX queue serializer will
be held, so for hardwares supporting multiple TX queues, contention on
driver's TX queue serializer could be greatly reduced.

Bunch of ifsq_ prefixed functions are added, which is used to perform
various operations on subqueues. Commonly used ifq_ prefixed functions
are still kept mainly for the drivers which do not support multiple TX
queues (well, these functions also ease the netif/ convertion in this
step :).

All of the pseudo network devices under sys/net are converted to use the
new subqueue operation. netproto/802_11 is converted too. igb(4) is
converted to use the new subqueue operation, the rest of the network
drivers are only changed for the if_start interface modification.

For ALTQs which have packet scheduler enabled, only the first subqueue
is used (*).

(*) Whether we should utilize multiple TX queues if ALTQ's packet scheduler
is enabled is quite questionable. Mainly because hardware's multiple TX
queue packet dequeue mechanism could have negative impact on ALTQ's packet
scheduler's decision.

show more ...

kernel/802_11: Remove unused variables.

kernel: Fix sizeof()s that were taking a pointer.

wlan - Rip out all wlan locks part 1/2

* Rip out all the individiual wlan locks

wlan - Convert lockmgr locking to a global token.

Use the lwkt_token API to synchronize the wlan layer entry points.

Discussed-With: dillon

Fix remaining M_NOWAIT and use ieee80211_handoff instead of if_transmit.

Second pass at converting the net80211 to DragonFly.

First pass at converting the net80211 infrastrcture from FreeBSD.