2000-10-05  Hugo Tyson  <hmt@redhat.com>

	* src/if_ebsa285.c: Deal with device interrupts in a nested
	fashion - disable/restore is the semantics now, rather than
	unconditionally unmasking.  Also go directly to the 21285 PIC's
	interrupt control registers to gain atomicity for these.  Poll for
	ready received packets when acknowledging an interrupt in the
	tranmitting world; a race here could lose an Rx interrupt.  Which
	doesn't matter on a busy system, but in quieter times...  there
	will always be such a race because of the vague way the i82559's
	status bits reflect how it's yanking the interrupt line; you have
	to poll until the interrupt is gone before returning else spurious
	interrupt failures occur.  The issue is to close the window as
	tightly as possible, which this change achieves at a minor cost in
	performance - because of the time spent polling when not required.

2000-09-11  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c (i82559_poll): Only diddle the interface we
	were asked to.  This is more correct in terms of the intent of the
	API, though it shouldn't really be necessary.

2000-09-06  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c (pci_init_find_82559s): Add asserts and an
	unconditional check that the PCI window as configured matches the
	address and size of the pci_window region from the MLT.  This is
	here because at present the MLT and CT cannot intercommunicate
	enough.  The separation of the PCI window is needed because
	otherwise the malloc heap will eat all memory.  [This is related
	to CR 902624-CR, "MLT needs to be configuration aware"]

2000-09-01  Hugo Tyson  <hmt@cygnus.co.uk>

	* OVERVIEW: This is part of the change to the network stack to
	greatly reduce latencies both of (other) DSRs and of thread
	scheduling.  All the work that the network stack *and* individual
	ether drivers used to do in DSRs (including alarm callbacks and
	data copies to/from the device memory) is moved into a "fast
	network thread" instead.  It calls a device's "deliver" function
	to do the work that was previously in the DSR.  This is a separate
	thread so that it can be set higher priority than application
	threads in order to minimize packet loss (depending on the
	driver), if required (the application threads presumed to be
	higher priority in turn than the network thread).  A crucial
	consequence of this is that we are no longer locking against DSRs,
	so a plain mutex can be used rather than the global scheduler
	lock, thus simplifying all the splfoo/splx() style functions.

	* src/if_ebsa285.c: Minor: fix the big assert in i82559_send()
	which suffered a race condition when called from the fast thread
	rather than from a DSR.  Major: Add a "deliver" entry to the
	interface record for the "fast thread" implementation of the
	network internal comms system.  Provide a pass-up DSR to the
	logical ether driver's DSR and appropriate delivery routine(s).
	i82559_poll() now calls i82559_deliver() rather than the DSR.  Add
	valid data for mux'd DSR to pass on up.

2000-09-01  Hugo Tyson  <hmt@cygnus.co.uk>

	* tests/test_net_realtime.h: Tighten up the latency requirements
	by a factor of 5; it all seems happy, so committed.

2000-08-25  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c (i82559_ioctl): A little further diddling; have
	a bool to say whether the dot3 info is filled in.

2000-08-24  Hugo Tyson  <hmt@cygnus.co.uk>

	* cdl/ebsa285_eth_drivers.cdl: Do not export a symbol for the
	device info file (include/ebsa285_info.h) since nobody needs
	(portably) to include it now.

	* src/if_ebsa285.c (i82559_ioctl): Handle new ioctl calls
	ETH_DRV_GET_IF_STATS_UD and ETH_DRV_GET_IF_STATS to get loads of
	statistical information out.  _UD means update.  The nonUD one can
	be used instead mostly, if we find the performance hit too large.
	This should allow SNMP (a) to not explode, (b) to get useful info
	out of other device implementations than this one.

	* include/ebsa285_info.h: Remove all the macro cruft for feature
	detecting of lots of individual statistics; we now just have a
	catch-all struct that SNMP uses, defined in the common ether
	driver environment.

2000-08-15  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c (PacketRxReady): Put back the check for very
	small packets into the driver; the layer above checks for that
	(defensive programming) but only *after* asserting that the size
	is large enough, to help detect that scenario from other drivers.
	I believe we only have struct ether_header available if CYGPKG_NET
	but I could be wrong.
	[CASE 104353]

2000-08-08  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c (eth_set_promiscuous_mode):
	- ccs->config_bytes[18]=0x70;
	+ ccs->config_bytes[18]=0x72; // Keep the Padding Enable bit
	...otherwise short frame sends don't work in promisc mode.
	[CASE 104289]

2000-08-07  Gary Thomas  <gthomas@redhat.com>

	* src/if_ebsa285.c (pciwindow_mem_alloc): Take out very noisy debug.

2000-08-03  Gary Thomas  <gthomas@redhat.com>

	* src/if_ebsa285.c: Changes for stand-alone mode.

	* cdl/ebsa285_eth_drivers.cdl: Ethernet driver package hierarchy changed.
	Add option to control number of interfaces.

2000-07-28  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c (PacketRxReady): Do not attempt to forward
	short packets; eth_drv.c assumes there is at least a header there.
	(i82559_recv): Also be more careful and ASSERTive about -ve buffer
	sizes; be more defensive about sglists.  [CASE 104206]

2000-07-26  Gary Thomas  <gthomas@redhat.com>

	* src/if_ebsa285.c: Update for new eth_drv interfaces.

2000-07-18  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c (i82559_poll): Fill in the flesh of this, it
	just calls ISR and DSR repeatedly.
	(i82559_start): Look in the device record for promiscuous mode
	flag; it should be passed though the common layer, but it's not
	[yet] - this change from Andrew Lunn/ASCOM.  Also a fix and delay
	to the promisc mode code per se.

2000-07-17  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c (i82559_poll): New function, just to fill in
	the interface record; not used.

2000-06-27  Hugo Tyson  <hmt@cygnus.co.uk>

	* cdl/ebsa285_eth_drivers.cdl: Add sesquipedalian option
	CYGDBG_DEVS_ETH_ARM_EBSA285_KEEP_82559_STATISTICS in (now)
	component CYGDBG_DEVS_ETH_ARM_EBSA285_KEEP_STATISTICS to control
	keeping (well, harvesting really) the i82559's internal stats.
	Reputedly, it doesn't service the net whilst this is happening, so
	it could be viewed a bad thing.  Hence the option.

	* include/ebsa285_info.h: Only describe the I82559_COUNTERS
	i82559_counters[2]; structs if full stats are to be kept.

	* src/if_ebsa285.c (update_statistics): Only include this if full
	stats are to be kept.

2000-06-27  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c (ResetRxRing): Re-do the management of the
	RxRing; have an end-of-list flag (EL) in the last entry, and as
	you unload filled slots, drag it round after you.

2000-06-14  Hugo Tyson  <hmt@cygnus.co.uk>

	* cdl/ebsa285_eth_drivers.cdl: Add option to control statistics
	keeping.

	* include/ebsa285_info.h: Act on it.

2000-06-13  Hugo Tyson  <hmt@cygnus.co.uk>

	* cdl/ebsa285_eth_drivers.cdl: Properly include the new header
	file and define symbols to allow client code to get at it without
	knowing the particular device driver name.

	* include/ebsa285_info.h: New file: export various statistics
	information about the driver for use by monitoring and
	network-management systems.  This requires exposing the
	(otherwise) internal structures of the driver.

	* src/if_ebsa285.c: remove a lot of structure definitions &c that
	are now necessarily in the new header; add a couple of new
	routines which provide status and update statistics from the
	device into memory; tidy up control of whether stats-keeping is
	enabled.

2000-06-06  Hugo Tyson  <hmt@cygnus.co.uk>

	* cdl/ebsa285_eth_drivers.cdl (define_proc): Add #define of
	CYGDAT_DEVS_ETH_DESCRIPTION in the config file for information.

2000-05-12  Hugo Tyson  <hmt@cygnus.co.uk>

	* tests/test_net_realtime.h (tnr_print_activity): New routine to
	check the system is working, tidied up the API.  It works!

2000-05-11  Hugo Tyson  <hmt@cygnus.co.uk>

	* cdl/ebsa285_eth_drivers.cdl: Added export of the test header
	below, and config opts for controlling EEPROM writing and all the
	status chatter as the device starts up.

	* src/if_ebsa285.c: Reworked the code for reading and setting the
	EEPROM that holds the MAC address.  This is very ugly, but now
	more reliable.  Also tidied up printing cruft with neater
	configury, and made it an option (for safety) whether it's
	possible to write the EEPROM at all.

	* tests/test_net_realtime.h: New file - it is intended to be used
	by networking tests to verify that latency is not compromised by
	the stack and driver.  It's very platform specific, hence the
	location in here.  This is a preliminary version only.

2000-04-27  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c: A serious re-write.  This cuts out a lot of
	code from the old version and improves the performance greatly.

	The cruft was mainly doing lots of explicit event communication
	between the ISR and DSR, when in fact all the state needed is
	present in the tx/rx rings.  So both ISRs and DSRs regard their
	call as an opportunity to progress everything they can, rather
	than only dealing with one interrupt cause at a time; the
	connection between them is now rather looser.

	Interrups can now be re-enabled after the ISR (in other words they
	are not masked in the ISR), no need to wait for the DSR, but in
	consequence some DSR code must mask/unmask intrs as it works.

	The 82559 appears to be a little slow in reacting to commands and
	state changes, so some interrupts were being lost - or persisting
	beyond their desired life - so there's some kinda polling code to
	deal with that also.  We also rely on the foreground to kind of
	poll in the same way, in the send/can_send calls - we know the
	stack will re-try if necessary, though this is rare.

	The driver now works (albeit at much reduced performance) with as
	few as 6 rx and tx buffers - in other words the "queue full/out of
	rx buffers" states have been tested and all is well.  It works
	generally fine with 8 buffers of each kind.

	The mux ISR and DSR are now rather more polled than the old
	versions; we just try to do things with both devices (if active)
	by simply calling each unitary ISR/DSR respectively.

	I also re-ordered some of the code, moving utilities to the end of
	the file and grouping together Tx and Rx machines a bit better.

2000-04-13  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c: Attribution to Ron Spence, Pacific Softworks
	added as a contributor.

2000-04-07  Hugo Tyson  <hmt@cygnus.co.uk>

	* ecos.db: Re-organize device packages.  This is a massive change
	involving deleting all the sources for serial and ethernet drivers
	from where they used to live in
	    packages/io/serial/current/src/ARCH/PLATFORM.[ch]
	    packages/net/drivers/eth/PLATFORM/current/src/...
	and reinstating them in
	    packages/devs/serial/ARCH/PLATFORM/current/src/...
	    packages/devs/eth/ARCH/PLATFORM/current/src/...

	All these new packages are properly defined in ecos.db, and are
	all of type "hardware" so that a "target" can grab them.
	
	This directory layout is descriptive of the devices we have right
	now, arch and platform are separate levels just to make it easier
	to navigate in the filesystem and similar to the HAL structure in
	the filesystem.

	It is *not* prescriptive of future work; for example, the mythical
	common highly-portable 16550 serial driver which works on many
	targets would be called "devs/serial/s16550/current", or a serial
	device for a particular board (cogent springs to mind) that can
	work with different CPUs fitted is "devs/serial/cogent/current".

	Changelogs have been preserved and replicated over all the new
	packages, so that no history is lost.

	The contents of individual source files are unchanged; they build
	in just the same emvironment except for a very few cases where the
	config file name changed in this movement.

	Targets in ecos.db have been redefined to bring in all relevant
	hardware packages including net and serial drivers (but the newly
	included packages are only active if their desired parent is
	available.)
	
	The names of CDL options (and their #defines of course) stay the
	same for the serial drivers, for backward compatibility.

	* templates/*/current.ect: these have had CYGPKG_IO_SERIAL added
	rather than it being in (almost) all target definitions.
	
2000-03-29  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c (i82559_recv): Be happy with NULLs in the
	SGlist; it means the caller is out of memory so drop the packet on
	the floor.  Also remove a completely redundant test.

2000-03-06  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c (i82559_can_send): Update net driver to new
	interface style.  This is incomplete wrt promiscuous mode, but
	that's probably about all.

2000-02-14  Gary Thomas  <gthomas@cygnus.co.uk>

	* cdl/ebsa285_eth_drivers.cdl: Update CDL to indicate multiple 
	interface support.

2000-02-14  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c (pci_init_find_82559s): Tidy comments somewhat
	and set debug and stats collecting defines to most friendly
	settings.

2000-02-10  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c (PacketRxReady): Fix bug; current descriptor
	was not being write back for the callback to use.  Hence asserts
	on state of rfd were firing in busy times - that leading rfd had
	already been drained.

	Also rationalized meaning of DEBUG printy symbols a bit - it's now
	chatty during startup/foreground manipulations but not in any
	performance related activities ie. rx or tx.

2000-02-09  John Dallaway  <jld@cygnus.co.uk>

	* cdl/ebsa285_eth_drivers.cdl:

	Reparent under CYGPKG_NET_ETH_DRIVERS and tidy display strings.

2000-02-08  Hugo Tyson  <hmt@cygnus.co.uk>

	* src/if_ebsa285.c: New File.
	* cdl/ebsa285_eth_drivers.cdl: New File.

	Initial Checkin of EBSA285 Ethernet driver.

	It's one monolithic file at present, and should be split up into a
	more generic Intel 82559 driver plus platform-specific parts (PCI
	et al) plus eCos/Red-Hat-BSD-stack parts.
	
//===========================================================================
//####COPYRIGHTBEGIN####
//                                                                          
// -------------------------------------------                              
// The contents of this file are subject to the Red Hat eCos Public License 
// Version 1.1 (the "License"); you may not use this file except in         
// compliance with the License.  You may obtain a copy of the License at    
// http://www.redhat.com/                                                   
//                                                                          
// Software distributed under the License is distributed on an "AS IS"      
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
// License for the specific language governing rights and limitations under 
// the License.                                                             
//                                                                          
// The Original Code is eCos - Embedded Configurable Operating System,      
// released September 30, 1998.                                             
//                                                                          
// The Initial Developer of the Original Code is Red Hat.                   
// Portions created by Red Hat are                                          
// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
// All Rights Reserved.                                                     
// -------------------------------------------                              
//                                                                          
//####COPYRIGHTEND####
//===========================================================================
	
	

