Replace a hardcoded buffer size by a sizeof union {}.  This shrinks the
stack-allocated ioctl argument buffer from 256 to 40 bytes.  (This is
not much, but subsequent stack usage particularly by the queue_iso ioctl
handler adds up.)

The new form is also easier to keep up to date than a hardcoded size if
more ioctls are added.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

I was told that there are obscure architectures with non-coherent DMA
which may DMA-map to bus address 0.  We shall not use 0 as a magic
number of uninitialized bus address variables.

The packet->payload_length > 0 test cannot be used either (except in
at_context_queue_packet) because local requests are not DMA-mapped
regardless of payload_length.  Hence add a state flag to struct
fw_packet.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

In the code path which creates request packets, clearly mark a switch
branch which must never be reached with a WARN.

In the code path which creates response packets, replace a BUG by a
friendlier to debug WARN.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

The Topology Map of the local node was created in CPU byte order,
then a temporary big endian copy was created to compute the CRC,
and when a read request to the Topology Map arrived it had to be
converted to big endian byte order again.

We now generate it in big endian byte order in the first place.
This also rids us of 1000 bytes stack usage in tasklet context.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

Move the static config ROM buffer into the scope of the two callers of
generate_config_rom().  That way the ROM length can be passed over as
return value rather than through a pointer argument.

It also becomes more obvious that accesses to the config ROM buffer have
to be serialized and how this is accomplished.  And firewire-core.ko
shrinks a bit as well.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

The config ROM image of the local node was created in CPU byte order,
then a temporary big endian copy was created to compute the CRC, and
finally the card driver created its own big endian copy.

We now generate it in big endian byte order in the first place to avoid
one byte order conversion and the temporary on-stack copy of the ROM
image (1000 bytes stack usage in process context).  Furthermore, two
1000 bytes memset()s are replaced by one 1000 bytes - ROM length sized
memset.

The trivial fw_memcpy_{from,to}_be32() helpers are now superfluous and
removed.  The newly added __compute_block_crc() function will be folded
into fw_compute_block_crc() in a subsequent change.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

Unify some names:
  - "e" for pointers to subtypes of struct event,
  - "event" for struct members and pointers to struct event,
  - "r" for pointers to subtypes of struct client_resource,
  - "resource" for struct members and pointers to struct client_resource,
  - other names for struct members and pointers to other types.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

A few stylistic changes to unify some code patterns in the subsystem:

  - The similar queue_delayed_work helpers fw_schedule_bm_work,
    schedule_iso_resource, and sbp2_queue_work now have the same call
    convention.
  - Two conditional calls of schedule_iso_resource are factored into
    another small helper.
  - An sbp2_target_get helper is added as counterpart to
    sbp2_target_put.

Object size of firewire-core is decreased a little bit, object size of
firewire-sbp2 remains unchanged.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

If copy_from_user in an FW_CDEV_IOC_SEND_RESPONSE ioctl failed, an
inbound_transaction_resource instance is no longer referenced and needs
to be freed.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

The Unit_Characteristics entry of an SBP-2 unit directory is not
mandatory as far as I can tell.  If it is missing, we would probably
fail to log in into the target because firewire-sbp2 would not wait for
status after it sent the login request.

The fix moves the cleanup of tgt->mgt_orb_timeout into a place where it
is executed exactly once before login, rather than 0..n times depending
on the target's config ROM.  With targets with one or more
Unit_Characteristics entries, the result is the same as before.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

The inquiry delay does more harm than good in tests on a recent kernel.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

Per SBP-2 clause 5.3, a target shall store 8...32 bytes of status
information.  Trailing zeros after the first 8 bytes don't need to be
stored, they are implicit.  Fix the status write handler to clear all
unwritten status data.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

This register is 1 kBytes large.  Adjust topology_map.length to prevent
registration of other response handlers in this region and to make sure
that we respond to requests to the upper half of the register.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

The config ROM buffer received from generate_config_rom is a globally
shared static buffer.  Extend the card_mutex protection in fw_add_card
until after the config ROM was copied into the card driver's buffer.
Otherwise, parallelized card driver probes may end up with ROM contents
that were meant for a different card.

firewire-ohci's card->driver->enable hook is safe to be called within
the card_mutex.  Furthermore, it is safe to reorder card_list update
versus card enable, which simplifies the code a little.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

fw_card_get, fw_card_put, fw_card_release are currently not exported for
use outside the firewire-core.  Move their definitions/ declarations
from the subsystem header file to the core header file.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

The selfIDSize field of Self ID Count is 9 bits wide, and we are only
interested in the high 8 bits.  Fix the mask accordingly.  The
previously too large mask didn't do damage though because the next few
bits in the register are reserved and therefore zero with presently
existing hardware.

Also, check for the maximum possible self ID count of 252 (according to
OHCI 1.1 clause 11.2 and IEEE 1394a-2000 clause 4.3.4.1, i.e. up to four
self IDs of up to 63 nodes, even though IEEE 1394 up to edition 2008
defines only up to three self IDs per node).  More than 252 self IDs
would only happen if the self ID receive DMA unit malfunctioned, which
would likely be caught by other self ID buffer checks.  However, check
it early to be sure.  More than 253 quadlets would overflow the Topology
Map CSR.

Reported-By: PaX Team
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

If a target writes invalid status (typically status of a command that
already timed out), firewire-sbp2 attempts to put away an ORB that
doesn't exist.  https://bugzilla.redhat.com/show_bug.cgi?id=519772Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

In dual-buffer DMA mode, no video frames are ever received from R5C832
by libdc1394.  Fallback to packet-per-buffer DMA works reliably.
http://thread.gmane.org/gmane.linux.kernel.firewire.devel/13393/focus=13476Reported-by: NJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

An Agere FW643 OHCI 1.1 card works fine for video reception from one
camera but fails early if receiving from two cameras.  After a short
while, no IR IRQ events occur and the context control register does not
react anymore.  This happens regardless whether both IR DMA contexts are
dual-buffer or one is dual-buffer and the other packet-per-buffer.

This can be worked around by disabling dual buffer DMA mode entirely.
http://sourceforge.net/mailarchive/message.php?msg_name=4A7C0594.2020208%40gmail.com
(Reported by Samuel Audet.)

In another report (by Jonathan Cameron), an FW643 works OK with two
cameras in dual buffer mode.  Whether this is due to different chip
revisions or different usage patterns (different video formats) is not
yet clear.  However, as far as the current capabilities of
firewire-core's isochronous I/O interface are concerned, simply
switching off dual-buffer on non-working and working FW643s alike is not
a problem in practice.  We only need to revisit this issue if we are
going to enhance the interface, e.g. so that applications can explicitly
choose modes.
Reported-by: NSamuel Audet <samuel.audet@gmail.com>
Reported-by: NJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

This fixes a regression due to post 2.6.30 commit "firewire: core: do
not DMA-map stack addresses" 6fdc0370.

As David Moore noted, a previously correct sizeof() expression became
wrong since the commit changed its argument from an array to a pointer.
This resulted in an oops in ohci_cancel_packet in the shared workqueue
thread's context when an isochronous resource was to be freed.
Reported-by: NJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

Increase the command ORB data structure to transport up to 16 bytes long
CDBs (instead of 12 bytes), and tell the SCSI mid layer about it.  This
is notably necessary for READ CAPACITY(16) and friends, i.e. support of
large disks.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

The DMA mapping API cannot map on-stack addresses, as explained in
Documentation/DMA-mapping.txt.  Convert the two cases of on-stack packet
payload buffers in firewire-core (payload of lock requests in the bus
manager work and in iso resource management) to slab-allocated memory.

There are a number on-stack buffers for quadlet write or quadlet read
requests in firewire-core and firewire-sbp2.  These are harmless; they
are copied to/ from card driver internal DMA buffers since quadlet
payloads are inlined with packet headers.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

The new stack is now recommended over the old one if used for industrial
video (IIDC/DCAM) or for storage devices (SBP-2) due to better
performance, improved compatibility, added features, and security.  It
should also be functionally on par with and is more secure than the old
ieee1394 stack in the use case of consumer video devices.

IP-over-1394 support for the new stack is currently emerging, and a
backend of the firedtv DVB driver to the new stack should be available
soon.

The one remaining area where the old stack is still required are audio
devices, as the new stack is not yet able to support the FFADO FireWire
audio framework.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

The AR req handler should not check the generation; higher level code
is the better place to handle bus generation changes.  The target node
ID just needs to be checked for not being the "all nodes" address; in
this case don't handle the request and don't respond.

Use Address_Error and Type_Error rcodes as appropriate.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

Fix some problems from "firewire: net: allow for unordered unit
discovery":
  - fwnet_remove was missing a list_del, causing fwnet_probe to crash if
    called after fwnet_remove, e.g. if firewire-ohci was unloaded and
    reloaded.
  - fwnet_probe should set its new_netdev flag only if it actually
    allocated a net_device.
  - Use dev_set_drvdata and dev_get_drvdata instead of deprecated direct
    access to device.driver_data.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

If isochronous contexts existed when firewire-ohci was unloaded, the
core iso shutdown functions crashed with NULL dereferences, and buffers
etc. weren't released.

How the fix works:  We first copy the card driver's iso shutdown hooks
into the dummy driver, then fw_destroy_nodes notifies upper layers of
devices going away, these should shut down (including their iso
contexts), wait_for_completion(&card->done) will be triggered after
upper layers gave up all fw_device references, after which the card
driver's shutdown proceeds.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

dmap_unmap_page() shall use the same direction as dma_map_page().
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

In the near future, the driver core is going to not allow direct access
to the driver_data pointer in struct device.  Instead, the functions
dev_get_drvdata() and dev_set_drvdata() should be used.  These functions
have been around since the beginning, so are backwards compatible with
all older kernel versions.

Cc: linux1394-devel@lists.sourceforge.net
Acked-by: NStefan Richter <stefanr@s5r6.in-berlin.de>
Cc: Kristian Hoegsberg <krh@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

The .ndo_tx_timeout callback is currently without function; delete it.
Give .watchdog_timeo a proper time value; lower it to 2 seconds.

Decrease the .tx_queue_len from 1000 (as in Ethernet card drivers) to 10
because we have only 64 transaction labels available, and responders
might have further limits of their AR req contexts.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

Decouple the creation and destruction of the net_device from the order
of discovery and removal of nodes with RFC 2734 unit directories since
there is no reliable order.  The net_device is now created when the
first RFC 2734 unit on a card is discovered, and destroyed when the last
RFC 2734 unit on a card went away.  This includes all remote units as
well as the local unit, which is therefore tracked as a peer now too.

Also, locking around the list of peers is slightly extended to guard
against peer removal.  As a side effect, fwnet_peer.pdg_lock has become
superfluous and is deleted.

Peer data (max_rec, speed, node ID, generation) are updated more
carefully.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

Change names of types, variables, functions.
Omit debug code.
Use get_unaligned*, put_unaligned*.
Annotate big endian data.
Handle errors in __init.
Change whitespace.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

The driver is now called firewire-net.  It might implement the transport
of other networking protocols in the future, notably IPv6 per RFC 3146.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

Implement IPv4 over IEEE 1394 as per RFC 2734 for the newer firewire
stack.  This feature has only been present in the older ieee1394 stack
via the eth1394 driver.

Still to do:
  - fix ipv4_priv and ipv4_node lifetime logic
  - fix determination of speeds and max payloads
  - fix bus reset handling
  - fix unaligned memory accesses
  - fix coding style
  - further testing/ improvement of fragment reassembly
  - perhaps multicast support
Signed-off-by: NJay Fenlason <fenlason@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (rebased, copyright note, changelog)

Tlabel is a 6 bits wide datum.  Wrap it after 63 rather than 31 for more
safety against transaction label exhaustion and potential responders'
transaction layer bugs.  (As noted by Guus Sliepen, this change requires
an expansion of tlabel_mask to 64 bits.)
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

This extra check will avoid Broadcast_Channel register related traffic
to many IIDC, SBP-2, and AV/C devices which aren't IRMC or have a
max_rec < 8 (i.e. support < 512 bytes async payload).  This avoids a
little bit of traffic after bus reset and is even more careful with
devices which don't implement this CSR.

The assumption is that no other protocol than IP over 1394 uses the
broadcast channel for streams.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

The IP-over-1394 driver will add child devices beneath card devices
which are not of type fw_device.  Hence firewire-core's callbacks in
device_for_each_child() and device_find_child() need to check for the
device type now.

Initial version written by Jay Fenlason.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

Retrieval of an fw_unit's parent is a common pattern in high-level code.
Wrap it up as device = fw_parent_device(unit).
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>

The source files of firewire-core, firewire-ohci, firewire-sbp2, i.e.
 "drivers/firewire/fw-*.c"
are renamed to
 "drivers/firewire/core-*.c",
 "drivers/firewire/ohci.c",
 "drivers/firewire/sbp2.c".

The old fw- prefix was redundant to the directory name.  The new core-
prefix distinguishes the files according to which driver they belong to.

This change comes a little late, but still before further firewire
drivers are added as anticipated RSN.
Signed-off-by: NStefan Richter <stefanr@s5r6.in-berlin.de>