Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from: pfg

MFC r312604 and r312605:

Simplify the handling of small packets padding in cpsw:
- Pad small packets to 60 bytes and not 64 (exclude the CRC bytes);
- Pad the packet using m_append(9), if the packet has enough space for
padding, which is usually true, it will not be necessary append a newly
allocated mbuf to the chain.

Suggested by: yongari

MFC r312608:

Handle the rx queue stall while reading the packets from NIC (when the
descriptor state will not change anymore). This seems to eliminate the
race where we can miss a stalled queue under high load.

While here remove the unnecessary curly brackets.

Reported by: Konstantin Kormashev <konstantin@netgate.com>

MFC r312636:

Properly assemble an mbuf chain out of received fragments.

Remove the rx_batch hack, it makes no difference now that most of bugs have
been sorted out.

MFC r312637:

Be a little more pedantic here, the TRM says the hardware is supposed to
only clean the OWNER bit on SOP descriptors.

Sponsored by: Rubicon Communications, LLC (Netgate)

MFC r309345:

The RX_FREEBUFFER registers are a write to increment field.
Writing the full queue size to it every time was makeing it overflow with a
lot of bogus values.

This fixes the interrupt storms on irq 40.

MFC r309347:

MDIO_PHYACCESS_ACK is only valid for read access, remove it from
miibus_writereg.

Reduce the DELAY() between reads while waiting for MII access.

Spotted by: yongari

Sponsored by: Rubicon Communications, LLC (Netgate)

MFC r309113:

Add the etherswitch(4) support for TI CPSW.
Adds VLAN and port management abilities for etherswitchcfg(8).

The code is conditionally enabled for now, because it is not necessary on
single ethernet use cases.

Obtained from: pfSense
Sponsored by: Rubicon Communications, LLC (Netgate)

MFC r306717:

if_cpsw overhaul:
- Fix RX and TX teardown:
. TX teardown would not reclaim the abandoned descriptors;
. Interrupt storms in RX teardown;
. Fixed the acknowledge of the teardown completion interrupt.

- Remove temporary lists for the descriptors;

- Simplified the descriptor handling (less writes and reads from
descriptors where possible);

- Better debug;

- Add support for the RX threshold interrupts:
With interrupt moderation only, an RX overrun is likely to happen. The
RX threshold is set to trigger a non paced interrupt everytime your RX
free buffers are under the minimum threshold, helping to prevent the rx
overrun.

The NIC now survive when pushed over its limits (where previously it would
lock up in a few seconds).

uFW (600MHz SoC) can now forward up to 560Mb/s of UDP traffic (netmap
pkt-gen as source and sink). TCP forwarding rate is over 350Mb/s.

No difference (other than CPU use) was seen on Beaglebone black (1GHz SoC)
for his fast ethernet.

Tested on: uFW, BBB
Sponsored by: Rubicon Communications, LLC (Netgate)

MFC r306376:

Add a sysctl to control the interrupt pacing on AM335x integrated switch.
The hardware can be set to limit the number of interrupts from 2 to 63
interrupts per ms.

To keep the compatibility with the TI documentation the sysctl take the
interval between the interrupts pulses: 16~500 us.

Sponsored by: Rubicon Communications, LLC (Netgate)

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Fix a lockup in tx path for cspw.

Sometimes the software loses the race when appending more descriptors to
the tx ring and the tx queue stops.

This commit detects this condition and restart the tx queue whenever it stall.

Tested by: sobomax@, Keith White <kwhite@site.uottawa.ca>,
Paul Mather <paul@gromit.dlib.vt.edu>
Sponsored by: Rubicon Communications (Netgate)
Approved by: re (kib)

Count the input and output packets.

Sponsored by: Rubicon Communications (Netgate)

Add support for dual emac mode.

In dual emac mode, the CPSW subsystem provides two independent ethernets.

This is implemented (as recommended by TI's TRM) with a mixture of switch
settings (vlans) and specific features of CPSW subsystem.

The driver was splitted to accommodate the shared parts (RX and TX rings
for example) while it still provides two independent ethernets.

Each of the ethernet ports driver has it's own set of MDIO registers among
the other private settings.

Previously this driver always operate in promisc mode, now the Switch ALE
(address table entry) is properly initialized and enabled.

The driver is also tested (and known to work) with both ports operating in
single port mode (active_slave 0 or 1).

Tested on uBMC (dual emac mode, both ports in single mode, giga and fast
ethernet) and BBB (single port, fast ethernet).

Sponsored by: Rubicon Communications (Netgate)

Fixes a few style(9) issues, remove extra blank lines.

No functional changes.

Sponsored by: Rubicon Comunications (Netgate)

Switch TI platform support code from using FreeBSD's custom-baked DTS
files to vendor-provided ones. It should make easier to adopt platform
code to new revisions of hardware and to use DTS overlays for various
Beaglebone extensions (shields/capes).

Original dts filenames were not changed, they're now wrappers over dts
files provided by TI. So make sure you update .dtb files on your
devices as part of kernel update

GPIO addressing was changed: instead of one global /dev/gpioc0 there
are per-bank instances of /dev/gpiocX. Each bank has 32 pins so for
instance pin 121 on /dev/gpioc0 in old addressing scheme is now pin 25
on /dev/gpioc3

On Pandaboard serial console devices was changed from /dev/ttyu0 to
/dev/ttyu2 so you'll have to update /etc/ttys to get login prompt
on serial port in multiuser mode. Single user mode serial console
should work as-is

Differential Revision: https://reviews.freebsd.org/D2146
Reviewed by: rpaulo, ian, Michal Meloun, Svatopluk Kraus

Another overhaul of the CPSW driver for BeagleBone

Major changes:
* Finally tracked down the flow control setting that
seems to have been causing TX stalls and watchdog timeouts
* RX and TX paths now share a lot more code
* TX interrupt is no longer used; we instead GC finished
tx queue entries at the bottom of the start routine.
* TX start now queues fragmented packets directly; it only
invokes defrag() for occasional very fragmented packets.
* "sysctl dev.cpsw" dumps controller statistics and queue counts
* Host Error Interrupt will give extensive debugging information
if the controller chokes on the queued data.

While trying to track down the root cause for
TX stalls in this driver, I've also had some
time to evaluate the effectiveness of different
watchdog strategies.

This is the latest attempt, which consolidates
all of the watchdog logic in one place and
consistently detects TX stalls and resets within
a couple of seconds.

Overhauled CPSW driver for TI CPSW Ethernet module
(as used in AM335x SoC for BeagleBone).

Among other things:
* Watchdog reset doesn't hang the driver.
* Disconnecting cable doesn't hang the driver.
* ifconfig up/down doesn't hang the driver
* Out-of-memory no longer panics the driver.

Known issues:
* Doesn't have good support for fragmented packets
(calls m_defrag() on TX, assumes RX packets are never fragmented)
* Promisc and allmulti still unimplimented
* addmulti and delmulti still unimplemented
* TX queue still stalls (but watchdog now consistently recovers in ~5s)
* No sysctl monitoring
* Only supports port0
* No switch configuration support
* Not tested on anything but BeagleBone

Committed from: BeagleBone

Merging of projects/armv6, part 10

- Support for Texas Instruments SoCs:
- AM335x
- OMAP4

- Kernel configs, DTS for Beaglebone and Pandaboard

Submitted by: Ben Gray, Damjan Marion