freebsd-dev/sys/netipx
Robert Watson 59dd72d040 Remove NETISR_MPSAFE, which allows specific netisr handlers to be directly
dispatched without Giant, and add NETISR_FORCEQUEUE, which allows specific
netisr handlers to always be dispatched via a queue (deferred).  Mark the
usb and if_ppp netisr handlers as NETISR_FORCEQUEUE, and explicitly
acquire Giant in those handlers.

Previously, any netisr handler not marked NETISR_MPSAFE would necessarily
run deferred and with Giant acquired.  This change removes Giant
scaffolding from the netisr infrastructure, but NETISR_FORCEQUEUE allows
non-MPSAFE handlers to continue to force deferred dispatch so as to avoid
lock order reversals between their acqusition of Giant and any calling
context.

It is likely we will be able to remove NETISR_FORCEQUEUE once
IFF_NEEDSGIANT is removed, as non-MPSAFE usb and if_ppp drivers will no
longer be supported.

Reviewed by:	bz
MFC after:	1 month
X-MFC note:	We can't remove NETISR_MPSAFE from stable/7 for KPI reasons,
		but the rest can go back.
2008-07-04 00:21:38 +00:00
..
ipx_cksum.c Use ANSI C function declarations throughout netipx. 2007-05-11 10:38:34 +00:00
ipx_if.h Remove IPX over IP tunneling support, which allows IPX routing over IP 2007-06-13 14:01:43 +00:00
ipx_input.c Remove NETISR_MPSAFE, which allows specific netisr handlers to be directly 2008-07-04 00:21:38 +00:00
ipx_outputfl.c Use ANSI C function declarations throughout netipx. 2007-05-11 10:38:34 +00:00
ipx_pcb.c Use ANSI C function declarations throughout netipx. 2007-05-11 10:38:34 +00:00
ipx_pcb.h Use ANSI C function declarations throughout netipx. 2007-05-11 10:38:34 +00:00
ipx_proto.c Add code to allow the system to handle multiple routing tables. 2008-05-09 23:03:00 +00:00
ipx_usrreq.c Remove IPX over IP tunneling support, which allows IPX routing over IP 2007-06-13 14:01:43 +00:00
ipx_var.h Use ANSI C function declarations throughout netipx. 2007-05-11 10:38:34 +00:00
ipx.c Include priv.h to pick up suser(9) definitions, missed in an earlier 2007-06-13 22:42:43 +00:00
ipx.h Remove IPX over IP tunneling support, which allows IPX routing over IP 2007-06-13 14:01:43 +00:00
README Add a simple netipx TODO list to the end of README, since there are a 2006-03-27 09:10:09 +00:00
spx_debug.c Make tcpstates[] static, and make sure TCPSTATES is defined before 2007-07-30 11:06:42 +00:00
spx_debug.h Make tcpstates[] static, and make sure TCPSTATES is defined before 2007-07-30 11:06:42 +00:00
spx_timer.h Factor out UCB and my copyrights from copyrights of Mike Mitchell; 2007-01-08 22:14:00 +00:00
spx_usrreq.c Rather than m_free(dtom(si)) in spx_reass(), return (1) which causes the 2008-05-29 07:18:43 +00:00
spx_var.h Factor out UCB and my copyrights from copyrights of Mike Mitchell; 2007-01-08 22:14:00 +00:00
spx.h Factor out UCB and my copyrights from copyrights of Mike Mitchell; 2007-01-08 22:14:00 +00:00

$FreeBSD$

This protocol implements IPX/SPX over Ethernet_II frame type 0x8137.
Please note: the SPX implementation may require further work and testing
to insure proper operation.

Mike Mitchell, Network Engineer
AMTECH Systems Corporation, Technology and Manufacturing
8600 Jefferson Street, Albuquerque, New Mexico 87113 (505) 856-8000
supervisor@alb.asctmd.com

John Hay
Some Company
Some Address
jhay@mikom.csir.co.za

Adapted for multi-processor, multi-threaded network stack by Robert N. M.
Watson, Computer Laboratory, University of Cambridge.

--- Copyright Information ---
/*-

Copyright (c) 1984, 1985, 1986, 1987, 1993
The Regents of the University of California.  All rights reserved.

Modifications Copyright (c) 1995, Mike Mitchell
Modifications Copyright (c) 1995, John Hay
Modifications Copyright (c) 2004-2006 Robert N. M. Watson

*/

--- TODO ---

(1) netipx default socket buffer sizes are very small by contemporary
    standards, and should be increased following testing and measurement.

(2) SPX will free the PCB and socket buffer memory on close(), which means
    close() in effects terminates the transfer of any outstanding buffered
    but unsent data.  As with TCP, it should instead grab its own
    reference to the socket so that it is not released, as hold onto it
    until the data transfer is complete.

(3) Raw socket capture of IPX output intercepts packets in the SPX output
    routine in order to feed them back into the raw socket.  This results
    in recursion into the socket code in the transmit path; instead,
    captured packets should be fed into a netisr that reinjects them into
    raw sockets from a new (asynchronous) context.

(4) IPX over IP encapsulation needs work to make it properly MPSAFE.