- Merge from HEAD

strict kobj signatures: fix assortment of miibus_writereg impls

return type should be int, not void

Reviewed by: imp, current@
Approved by: jhb (mentor)

When user_frac in the polling subsystem is low it is going to busy the
CPU for too long period than necessary. Additively, interfaces are kept
polled (in the tick) even if no more packets are availa

When user_frac in the polling subsystem is low it is going to busy the
CPU for too long period than necessary. Additively, interfaces are kept
polled (in the tick) even if no more packets are available.
In order to avoid such situations a new generic mechanism can be
implemented in proactive way, keeping track of the time spent on any
packet and fragmenting the time for any tick, stopping the processing
as soon as possible.

In order to implement such mechanism, the polling handler needs to
change, returning the number of packets processed.
While the intended logic is not part of this patch, the polling KPI is
broken by this commit, adding an int return value and the new flag
IFCAP_POLLING_NOCOUNT (which will signal that the return value is
meaningless for the installed handler and checking should be skipped).

Bump __FreeBSD_version in order to signal such situation.

Reviewed by: emaste
Sponsored by: Sandvine Incorporated

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- Move ether_ifdetach earlier.
- Drain callouts after ether_ifdetach.

Suggested by: jhb

Use callout_init_mtx to simplify locking somewhat. While we're here, rearrange
some operations in smc_detach to remove the need for the smc_shutdown variable.

Suggested by: jhb

Make sure we drain our taskqueues and stop our callouts in detach.

Switch to using a normal mutex instead of a spin mutex.

We still use the interrupt filter due to performance problems that show up if
we don't. The main problem seen is that, due to the interrupt b

Switch to using a normal mutex instead of a spin mutex.

We still use the interrupt filter due to performance problems that show up if
we don't. The main problem seen is that, due to the interrupt being edge
triggered, we occasionally miss interrupts which leads us to not notice that
we can transmit more packets. Using the new approach, which just schedules
a task on a taskqueue, we are guaranteed to have the task run even if the
interrupt arrived while we were already executing. If we were to use an
ithread the system would mask the interrupt while the handler is run and we'd
miss interrupts.

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Convert bus_space_{read,write}_* calls to bus_{read,write}_* calls.

Suggested by: jhb

This is a rewritten driver for the SMSC LAN91C111. It's based in part on the
sn(4) driver and also looking at newer drivers. The reason for the rewrite is
to support MII and to try and resolve some

This is a rewritten driver for the SMSC LAN91C111. It's based in part on the
sn(4) driver and also looking at newer drivers. The reason for the rewrite is
to support MII and to try and resolve some performance issues found when trying
to use the sn(4) driver on the Gumstix network boards.

For reference, the SMSC LAN91C111 is a non-PCI ethernet part whose lineage
dates back to Ye Olde Days of ISA. It seems to get some use in the embedded
space these days on parts lacking on-board MACs or on-board PCI controllers,
such as the XScale PXA line of ARM CPUs.

This also includes a driver for the SMSC LAN83C183 10/100 PHY.

Man page to follow.

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