Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

At long last, commit the zero copy sockets code.

MAKEDEV: Add MAKEDEV glue for the ti(4) device nodes.

ti.4: Update the ti(4) man page to include information on the
TI_JUMBO_HDRSPLIT and TI_PRIVATE_JUMBOS kernel options,
and also include information about the new character
device interface and the associated ioctls.

man9/Makefile: Add jumbo.9 and zero_copy.9 man pages and associated
links.

jumbo.9: New man page describing the jumbo buffer allocator
interface and operation.

zero_copy.9: New man page describing the general characteristics of
the zero copy send and receive code, and what an
application author should do to take advantage of the
zero copy functionality.

NOTES: Add entries for ZERO_COPY_SOCKETS, TI_PRIVATE_JUMBOS,
TI_JUMBO_HDRSPLIT, MSIZE, and MCLSHIFT.

conf/files: Add uipc_jumbo.c and uipc_cow.c.

conf/options: Add the 5 options mentioned above.

kern_subr.c: Receive side zero copy implementation. This takes
"disposable" pages attached to an mbuf, gives them to
a user process, and then recycles the user's page.
This is only active when ZERO_COPY_SOCKETS is turned on
and the kern.ipc.zero_copy.receive sysctl variable is
set to 1.

uipc_cow.c: Send side zero copy functions. Takes a page written
by the user and maps it copy on write and assigns it
kernel virtual address space. Removes copy on write
mapping once the buffer has been freed by the network
stack.

uipc_jumbo.c: Jumbo disposable page allocator code. This allocates
(optionally) disposable pages for network drivers that
want to give the user the option of doing zero copy
receive.

uipc_socket.c: Add kern.ipc.zero_copy.{send,receive} sysctls that are
enabled if ZERO_COPY_SOCKETS is turned on.

Add zero copy send support to sosend() -- pages get
mapped into the kernel instead of getting copied if
they meet size and alignment restrictions.

uipc_syscalls.c:Un-staticize some of the sf* functions so that they
can be used elsewhere. (uipc_cow.c)

if_media.c: In the SIOCGIFMEDIA ioctl in ifmedia_ioctl(), avoid
calling malloc() with M_WAITOK. Return an error if
the M_NOWAIT malloc fails.

The ti(4) driver and the wi(4) driver, at least, call
this with a mutex held. This causes witness warnings
for 'ifconfig -a' with a wi(4) or ti(4) board in the
system. (I've only verified for ti(4)).

ip_output.c: Fragment large datagrams so that each segment contains
a multiple of PAGE_SIZE amount of data plus headers.
This allows the receiver to potentially do page
flipping on receives.

if_ti.c: Add zero copy receive support to the ti(4) driver. If
TI_PRIVATE_JUMBOS is not defined, it now uses the
jumbo(9) buffer allocator for jumbo receive buffers.

Add a new character device interface for the ti(4)
driver for the new debugging interface. This allows
(a patched version of) gdb to talk to the Tigon board
and debug the firmware. There are also a few additional
debugging ioctls available through this interface.

Add header splitting support to the ti(4) driver.

Tweak some of the default interrupt coalescing
parameters to more useful defaults.

Add hooks for supporting transmit flow control, but
leave it turned off with a comment describing why it
is turned off.

if_tireg.h: Change the firmware rev to 12.4.11, since we're really
at 12.4.11 plus fixes from 12.4.13.

Add defines needed for debugging.

Remove the ti_stats structure, it is now defined in
sys/tiio.h.

ti_fw.h: 12.4.11 firmware.

ti_fw2.h: 12.4.11 firmware, plus selected fixes from 12.4.13,
and my header splitting patches. Revision 12.4.13
doesn't handle 10/100 negotiation properly. (This
firmware is the same as what was in the tree previously,
with the addition of header splitting support.)

sys/jumbo.h: Jumbo buffer allocator interface.

sys/mbuf.h: Add a new external mbuf type, EXT_DISPOSABLE, to
indicate that the payload buffer can be thrown away /
flipped to a userland process.

socketvar.h: Add prototype for socow_setup.

tiio.h: ioctl interface to the character portion of the ti(4)
driver, plus associated structure/type definitions.

uio.h: Change prototype for uiomoveco() so that we'll know
whether the source page is disposable.

ufs_readwrite.c:Update for new prototype of uiomoveco().

vm_fault.c: In vm_fault(), check to see whether we need to do a page
based copy on write fault.

vm_object.c: Add a new function, vm_object_allocate_wait(). This
does the same thing that vm_object allocate does, except
that it gives the caller the opportunity to specify whether
it should wait on the uma_zalloc() of the object structre.

This allows vm objects to be allocated while holding a
mutex. (Without generating WITNESS warnings.)

vm_object_allocate() is implemented as a call to
vm_object_allocate_wait() with the malloc flag set to
M_WAITOK.

vm_object.h: Add prototype for vm_object_allocate_wait().

vm_page.c: Add page-based copy on write setup, clear and fault
routines.

vm_page.h: Add page based COW function prototypes and variable in
the vm_page structure.

Many thanks to Drew Gallatin, who wrote the zero copy send and receive
code, and to all the other folks who have tested and reviewed this code
over the years.

Use a custom Tigon 2 firmware image, hopefully temporarily. This is
the 12.4.11 firmware with a few changes to the link handling code merged
in from the 12.4.13 release. I'm doing this because the 12.4.13 firmware
doesn't seem to handle 10/100 link settings properly on 1000baseT cards.
Note that the revision codes still identify the firmware as 12.4.13
because both ti_fw2.h and ti_fw.h have to have the same revision values,
and I wanted to keep the 12.4.13 firmware for Tigon 1 cards.

It's nice to have firmware source.

Update the Tigon driver to support 1000baseTX gigE over copper AceNIC
cards. This basically involves switching to the 12.4.13 firmware, plus
a couple of minor tweaks to the driver.

Also changed the jumbo buffer allocation scheme just a little to avoid
'failed to allocate jumbo buffer' conditions in certain cases.

Update the Tigon firmware to 12.3.21. This fixes a few bugs and adds support
for cards with 2MB of on-board SRAM.

Update Tigon firmware yet again, this time to version 12.3.20.

Update the Tigon driver to use the 12.3.18 firmware release from Alteon.
(No changes to the driver code itself.)

Approved by: jkh

Update the Tigon driver firmware images to the latest release from
Alteon (12.6.15).

$Id$ -> $FreeBSD$

Convert the Alteon Tigon gigabit ethernet driver to newbus. Also upgrade
to the latest firmware release from Alteon (12.3.12).

Upgrade firmware images Alteon's latest release (12.3.10). This fixes a
bug in the stats accounting (nicSendBDs counter was bogus when TX ring was
configured to be in host memory).

Update if_tireg.h to look for new firmware fix level.

Add driver support for gigabit ethernet adapters based on the Alteon
Networks Tigon 1 and Tigon 2 chipsets. There are a _lot_ of OEM'ed
gigabit ethernet adapters out there which use the Alteon chipset so
this driver covers a fair amount of hardware. I know that it works with
the Alteon AceNIC, 3Com 3c985 and Netgear GA620, however it should also
work with the DEC/Compaq EtherWORKS 1000, Silicon Graphics Gigabit
ethernet board, NEC Gigabit Ethernet board and maybe even the IBM and
and Sun boards. The Netgear board is the cheapest (~$350US) but still
yields fairly good performance.

Support is provided for jumbo frames with all adapters (just set the
MTU to something larger than 1500 bytes), as well as hardware multicast
filtering and vlan tagging (in conjunction with the vlan support in
-current, which I should merge into -stable soon). There are some hooks
for checksum offload support, but they're turned off for now since
FreeBSD doesn't have an officially sanctioned way to support checksum
offloading (yet).

I have not added the 'device ti0' entry to GENERIC since the driver
with all the firmware compiled in is quite large, and it doesn't really
fit into the category of generic hardware.