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069363018f
understand exactly what it is about SMPng that tickles this bug. What I do know is that the foo_init() routine in most drivers is often called twice when an interface is brought up. One time is due to the ifconfig(8) command calling the SIOCSIFFLAGS ioctl to set the IFF_UP flag, and another is probably due to the kernel calling ifp->if_init at some point. In any case, the SMPng changes seem to affect the timing of these two events in such a way that there is a significant delay before any packets are sent onto the wire after the interface is first brought up. This manifested itself locally as an SMPng test machine which failed to obtain an address via DHCP when booting up. It looks like the second call to fxp_init() is happening faster now than it did before, and I think it catches the chip while it's in the process of dealing with the configuration command from the first call. Whatever the case, a FXP_CSR_SCB_CNA interrupt event is now generated shortly after the second fxp_init() call. (This interrupt is apparently never generated by a non-SMPng kernel, so nobody noticed.) There are two problems with this: first, fxp_intr() does not handle the FXP_CSR_SCB_CNA interrupt event (it never tests for it or does anything to deal with it), and second, the meaning of FXP_CSR_SCB_CNA is not documented in the driver. (Apparently it means "command unit not active.") Bad coder. No biscuit. The fix is to have the FXP_CSR_SCB_CNA interrupt handled just like the FXP_SCB_STATACK_CXTNO interrupt. This prevents the state machine for the configuration/RX filter programming stuff from getting wedged for several seconds and preventing packet transmission. Noticed by: jhb |
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| contrib | ||
| crypto | ||
| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| kerberosIV | ||
| lib | ||
| libexec | ||
| release | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| COPYRIGHT | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.upgrade | ||
| README | ||
| UPDATING | ||
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel, the kernel-modules and the contents of /etc. The ``buildkernel'' and ``installkernel'' targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/handbook/kernelconfig.html And in the config(8) man page. Note: If you want to build and install the kernel with the ``buildkernel'' and ``installkernel'' targets, you have to build world before. More information is available in the handbook. The sample kernel configuration files reside in the sys/i386/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file NOTES contains entries and documentation for all possible devices, not just those commonly used. It is the successor of the ancient LINT file, but in contrast to LINT, it is not buildable as a kernel but a pure reference and documentation file. Source Roadmap: --------------- bin System/User commands. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberosIV Kerberos package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. sbin System commands. secure DES and DES-related utilities - NOT FOR EXPORT! share Shared resources. sys Kernel sources. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/handbook/synching.html