freebsd with flexible iflib nic queues
1ed7bf1e3b
incoming ARP packet and route request adding/removing
ARP entries. The root of the problem is that
struct llinfo_arp was accessed without any locks.
To close race we will use locking provided by
rtentry, that references this llinfo_arp:
- Make arplookup() return a locked rtentry.
- In arpresolve() hold the lock provided by
rt_check()/arplookup() until the end of function,
covering all accesses to the rtentry itself and
llinfo_arp it refers to.
- In in_arpinput() do not drop lock provided by
arplookup() during first part of the function.
- Simplify logic in the first part of in_arpinput(),
removing one level of indentation.
- In the second part of in_arpinput() hold rtentry
lock while copying address.
o Fix a condition when route entry is destroyed, while
another thread is contested on its lock:
- When storing a pointer to rtentry in llinfo_arp list,
always add a reference to this rtentry, to prevent
rtentry being destroyed via RTM_DELETE request.
- Remove this reference when removing entry from
llinfo_arp list.
o Further cleanup of arptimer():
- Inline arptfree() into arptimer().
- Use official queue(3) way to pass LIST.
- Hold rtentry lock while reading its structure.
- Do not check that sdl_family is AF_LINK, but
assert this.
Reviewed by: sam
Stress test: http://www.holm.cc/stress/log/cons141.html
Stress test: http://people.freebsd.org/~pho/stress/log/cons144.html
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| bin | ||
| contrib | ||
| crypto | ||
| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| ObsoleteFiles.inc | ||
| 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/doc/en_US.ISO8859-1/books/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 might need to build world before. More information is available in the handbook. The sample kernel configuration files reside in the sys/<arch>/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. kerberos5 Kerberos5 (Heimdal) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. sbin System commands. secure Cryptographic libraries and commands. 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/doc/en_US.ISO8859-1/books/handbook/synching.html