has observable overhead when the buffer pages are not resident or not
mapped. The overhead comes at least from two factors, one is the
additional work needed to detect the situation, prepare and execute
the rollbacks. Another is the consequence of the i/o splitting into
the batches of the held pages, causing filesystems see series of the
smaller i/o requests instead of the single large request.
Note that expected case of the resident i/o buffer does not expose
these issues. Provide a prefaulting for the userspace i/o buffers,
disabled by default. I am careful of not enabling prefaulting by
default for now, since it would be detrimental for the applications
which speculatively pass extra-large buffers of anonymous memory to
not deal with buffer sizing (if such apps exist).
Found and tested by: bde, emaste
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
use CTASSERTs now that we have them...
Replace a draft w/ RFC that's over 10 years old.
Note that _AALG and _EALG do not need to match what the IKE daemons
think they should be.. This is part of the KABI... I decided to
renumber AESCTR, but since we've never had working AESCTR mode, I'm
not really breaking anything.. and it shortens a loop by quite
a bit..
remove SKIPJACK IPsec support... SKIPJACK never made it out of draft
(in 1999), only has 80bit key, NIST recommended it stop being used
after 2010, and setkey nor any of the IKE daemons I checked supported
it...
jmgurney/ipsecgcm: a357a33, c75808b, e008669, b27b6d6
Reviewed by: gnn (earlier version)
The IPsec SA statistic keeping is used even for decision making on expiry/rekeying SAs.
When there are multiple transformations being done the statistic keeping might be wrong.
This mostly impacts multiple encapsulations on IPsec since the usual scenario it is not noticed due to the code path not taken.
Differential Revision: https://reviews.freebsd.org/D3239
Reviewed by: ae, gnn
Approved by: gnn(mentor)
Right now there is a chance that sysctl unregister will cause reader to
block on the sx lock associated with sysctl rmlock, in which case kernels
with debug enabled will panic.
Brightness is controlled through sysctl dev.gpiobacklight.X.brightness:
- any value greater than 0: backlight is on
- any value less than or equal to 0: backlight is off
FDT bindings docs in Linux tree:
Documentation/devicetree/bindings/video/backlight/gpio-backlight.txt
In tf_dequeue(), if we reach the end of the list without finding a
non-cancelled element, "tmp" will be a pointer into the list head, so the
tmp->canceled check is bogus. Use a flag instead.
Submitted by: Tao Liu <Tao.Liu@isilon.com>
Reviewed by: hselasky
MFC after: 1 week
Sponsored by: EMC / Isilon Storage Division
Differential Revision: https://reviews.freebsd.org/D3244
the VM_FAULT_CHANGE_WIRING flag to VM_FAULT_WIRE. Assert that the
flag is only passed when faulting on the wired map entry. Remove the
vm_page_unwire() call, which should be never reachable.
Since VM_FAULT_WIRE flag implies wired map entry, the TRYPAGER() macro
is reduced to the testing of the fs.object having a default pager.
Inline the check.
Suggested and reviewed by: alc
Tested by: pho (previous version)
MFC after: 1 week
The check added in r285872 can trigger for valid buffers if the buffer space
used happens to be just after unmapped_buf in KVA space.
Discussed with: kib
Sponsored by: Citrix Systems R&D
This includes additional functions to be protected: those that
have local array definitions, or have references to local frame
addresses. This is a new option in GCC-4.9 that was relicensed
by Han Shen from Google under GPLv2 for OpenBSD.
Obtained from: OpenBSD (2014-01-14)
MFC after: 2 weeks
FreeBSD provides a feature called Adaptive Mutexes, which allows
a thread to spin for a while when the mutex is taken instead of
immediately going to sleep. This causes issues when called from
syscall handler if interrupts are masked. If every other core
also attempts to access the same mutex there is a chance that
all of them are spinning on the same lock at the same time.
If interrupts are disabled, no kernel preemtion can occur and
the system becomes unresponsive.
This patch enables interrupts when syscall is being executed
and masks them as soon as it is completed.
Reviewed by: andrew
Obtained from: Semihalf
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3246
This is a clean-up patch from a serie delivering support for
Annapurna Labs Alpine PoC.
The HAL files have already been added to sys/contrib/alpine-hal
so there is no need for them in the platform directory.
This patch removes obsolete files.
Reviewed by: andrew
Obtained from: Semihalf
Sponsored by: Annapurna Labs
Differential Revision: https://reviews.freebsd.org/D3248
ELF Tool Chain built on FreeBSD's ar and elfdump, but has a number of
improvements and enhancements. Bring them into contrib in order to start
integrating into our build.
issues on some EC2 instance types. Users may want to experiment with
removing this from loader.conf and measuring the performance impact on
the EC2 instances they are using.
the blkfront driver to perform I/Os of up to 2 MB, subject to support from
the blkback to which it is connected and the initiation of such large I/Os
by the rest of the kernel. In practice, the I/O size is increased from 40 kB
to 128 kB.
The changes to xen/interface/io/blkif.h consist merely of merging updates
from the upstream Xen repository.
In dev/xen/blkfront/block.h we add some convenience macros and structure
fields used for indirect-page I/Os: The device records its negotiated limit
on the number of indirect pages used, while each I/O command structure gains
permanently allocated page(s) for indirect page references and the Xen grant
references for those pages.
In dev/xen/blkfront/blkfront.c we now check in xbd_queue_cb whether a request
is small enough to handle without an indirection page, and either follow the
previous behaviour or use new code for issuing an indirect segment I/O. In
xbd_connect we read the size of indirect segment I/Os supported by the backend
and select the maximum size we will use; then allocate the pages and Xen grant
references for each I/O command structure. In xbd_free those grants and pages
are released.
A new loader tunable, hw.xbd.xbd_enable_indirect, can be set to 0 in order to
disable this functionality; it works by pretending that the backend does not
support this feature. Some backends exhibit a loss of performance with large
I/Os, so users may wish to test with and without this functionality enabled.
Reviewed by: royger
MFC after: 3 days
Relnotes: yes
R_Free(). This matches the other macros and reduces the chances to clash
with other headers.
This also fixes the build of radix.c outside of the kernel environment.
Reviewed by: glebius
unconfirmed clientid structure for the same client on the last hash list,
this old entry would not be removed/deleted. I do not think this bug would have
caused serious problems, since the new entry would have been before the old one
on the list. This old entry would have eventually been scavenged/removed.
Detected while reading the code looking for another bug.
MFC after: 3 days
When firewalls force a reloop of packets and the caller supplied a route the reference to the route might be reduced twice creating issues.
This is especially the scenario when a packet is looped because of operation in the firewall but the new route lookup gives a down route.
Differential Revision: https://reviews.freebsd.org/D3037
Reviewed by: gnn
Approved by: gnn(mentor)
We previously disabled CLANG_FULL on (little-endian) ARM because the
build failed. This is no longer the case and as of Clang 3.5 we cannot
build any part of the in-tree Clang with in-tree GCC, so it's no longer
necessary to disable CLANG_FULL.
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D2525
ELF Tool Chain elfcopy is nearly a drop-in replacement for GNU objcopy,
but does not currently support PE output which is needed for building
x86 UEFI bits.
Add a src.conf knob to allow installing it as objcopy and set it by
default for aarch64 only, where we don't have a native binutils.
Reviewed by: bapt
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D2887
ip_output has a big chunk of code used to handle special cases with pfil consumers which also forces a reloop on it.
Gather all this code together to make it readable and properly handle the reloop cases.
Some of the issues identified:
M_IP_NEXTHOP is not handled properly in existing code.
route reference leaking is possible with in FIB number change
route flags checking is not consistent in the function
Differential Revision: https://reviews.freebsd.org/D3022
Reviewed by: gnn
Approved by: gnn(mentor)
MFC after: 4 weeks
non-inline urgent data and introduce an mbuf exhaustion attack vector
similar to FreeBSD-SA-15:15.tcp, but not requiring VNETs.
Address the issue described in FreeBSD-SA-15:15.tcp.
Reviewed by: glebius
Approved by: so
Approved by: jmallett (mentor)
Security: FreeBSD-SA-15:15.tcp
Sponsored by: Norse Corp, Inc.
