Mitchell Horne [Fri, 20 Nov 2020 15:21:10 +0000 (15:21 +0000)]
riscv: always initialize the static kernel environment
Ensure we initialize the static environment when not booting via
loader(8), and provide a static buffer if this is the case. This fixes
two issues.
First, performing the initialization ensures that kenv variables set in
the kernel's config file are honored. Previously, any new or overridden
values were ignored.
Second, providing the static buffer allows variables to be set in the
device tree's bootargs property of the chosen node. This can be set by
u-boot or by QEMU's '-append' flag. Attempting to this prior to this
change resulted in an early panic, since the static environment had no
buffer backing it.
Mitchell Horne [Fri, 20 Nov 2020 14:45:45 +0000 (14:45 +0000)]
Make net/ifq.h C++ friendly
Don't use "new" as an identifier, and add explicit casts from void *.
As a general policy, FreeBSD doesn't make any C++ compatibility
guarantees for kernel headers like it does for userland, but it is a
small effort to do so in this case, to the benefit of a downstream
consumer (NetApp).
Reviewed by: rscheff
Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D27286
The problem is that zfs is asked to stop too early in the shutdown
sequence. Other services, such as syslog may still be running and have some
files open (e.g., under /var/log). This of course causes the messages like:
For now, let's remove the shutdown KEYWORD from the zfs service, as people are
reporting problems in their setups:
https://lists.freebsd.org/pipermail/freebsd-current/2020-November/077559.html
In the future, we may think of stopping zfs on shutdown after all the other
services and just before init(8) exits. Another interesting option might be to
a new rcorder(8) KEYWORD like "shutdownjail", but this idea would need to be
discussed a bit.
Michael Tuexen [Fri, 20 Nov 2020 13:00:28 +0000 (13:00 +0000)]
Fix an issue I introuced in r367530: tcp_twcheck() can be called
with to == NULL for SYN segments. So don't assume tp != NULL.
Thanks to jhb@ for reporting and suggesting a fix.
Michal Meloun [Fri, 20 Nov 2020 09:05:36 +0000 (09:05 +0000)]
Also pass interrupt binding request to non-root interrupt controllers.
There are message based controllers that can bind interrupts even if they are
not implemented as root controllers (such as the ITS subblock of GIC).
Alexander Motin [Fri, 20 Nov 2020 01:15:48 +0000 (01:15 +0000)]
Remove parallel SCSI and 1/2Gb FC support from isp(4).
This removes 288KB (36%) of the driver code and zillions of hacks and
workarounds, making single driver uniformly support several different
generations of hardware interfaces, not counting minor card variations.
After years of the hopeless fight, I don't think it worth to continue
support for hardware obsolete for 15-20 years. Instead much cleaner
now code should allow to move forward toward better locking, multiple
queues and other cool features.
All the remaining Qlogic cards starting from 4Gb 24xx to 32Gb 27xx use
the same hardware/firmware interface with minor incremental improvements,
so it seems to be a good new starting point. Except one PCI-X model all
all of them are PCIe and so still usable in modern systems.
psm(4): Disable AUX multiplexer probing on all Lenovo laptops.
Rudimentary AUX multiplexing support was added to kernel to make possible
touchpad initialization on some HP EliteBook laptops with trackpoint.
Disable multiplexer probing on all Lenovo laptops now as they use touchpad
pass-through port rather than AUX multiplexer to connect trackpoint and
at least two model (X120e and X121e) is known for getting PS/2 AUX port
dysfunctional after switching back to hidden multiplexing mode.
AUX MUX probing can be reenabled with setting of hw.psm.mux_disabled loader
tunable to 0.
Mateusz Guzik [Thu, 19 Nov 2020 19:25:47 +0000 (19:25 +0000)]
pipe: thundering herd problem in pipelock
All reads and writes are serialized with a hand-rolled lock, but unlocking it
always wakes up all waiters. Existing flag fields get resized to make room for
introduction of waiter counter without growing the struct.
While here, extend the initial description paragraph to note that fstat(1)
will report on all opened files, belonging to processes the user has access to.
The current paragraph may lead to understand that you can get information on
opened files from processes belonging to other users.
* Add more EXAMPLES covering flags: -A, -B, -c, -f, -i, -H, -l, -q, -R, -w
* While here, change existing wording to use the imperative (remove "To
find")
* Reword first example to be consistent with how grep(1) understand
words (-w)
Mark Johnston [Thu, 19 Nov 2020 18:37:28 +0000 (18:37 +0000)]
callout(9): Fix a race between CPU migration and callout_drain()
Suppose a running callout re-arms itself, and before the callout
finishes running another CPU calls callout_drain() and goes to sleep.
softclock_call_cc() will wake up the draining thread, which may not run
immediately if there is a lot of CPU load. Furthermore, the callout is
still in the callout wheel so it can continue to run and re-arm itself.
Then, suppose that the callout migrates to another CPU before the
draining thread gets a chance to run. The draining thread is in this
loop in _callout_stop_safe():
while (cc_exec_curr(cc) == c) {
CC_UNLOCK(cc);
sleep();
CC_LOCK(cc);
}
but after the migration, cc points to the wrong CPU's callout state.
Then the draining thread goes off and removes the callout from the
wheel, but does so using the wrong lock and per-CPU callout state.
Fix the problem by doing a re-lookup of the callout CPU after sleeping.
Mitchell Horne [Thu, 19 Nov 2020 18:03:40 +0000 (18:03 +0000)]
Add an option for entering KDB on recursive panics
There are many cases where one would choose avoid entering the debugger
on a normal panic, opting instead to reboot and possibly save a kernel
dump. However, recursive kernel panics are an unusual case that might
warrant attention from a human, so provide a secondary tunable,
debug.debugger_on_recursive_panic, to allow entering the debugger only
when this occurs.
For for simplicity in maintaining existing behaviour, the tunable
defaults to zero.
Reviewed by: cem, markj
Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D27271
Section 7 of the manual pages contain lots of very useful information, but
finding the pages is not always obvious - to assist people in finding the
information, add missing cross-references.
Emmanuel Vadot [Thu, 19 Nov 2020 14:27:01 +0000 (14:27 +0000)]
release: Switch the Allwinner board to GPT
Allwinner bootrom have an alternate location for u-boot at 128k.
Work was made recently in u-boot to relocate correctly if loaded from
there.
The advantage of this offset is that we can now use a GPT scheme.
Mateusz Guzik [Thu, 19 Nov 2020 10:00:48 +0000 (10:00 +0000)]
thread: numa-aware zombie reaping
The current global list is a significant problem, in particular induces a lot
of cross-domain thread frees. When running poudriere on a 2 domain box about
half of all frees were of that nature.
Patch below introduces per-domain thread data containing zombie lists and
domain-aware reaping. By default it only reaps from the current domain, only
reaping from others if there is free TID shortage.
A dedicated callout is introduced to reap lingering threads if there happens
to be no activity.
Mateusz Guzik [Thu, 19 Nov 2020 06:30:25 +0000 (06:30 +0000)]
pipe: allow for lockless pipe_stat
pipes get stated all thet time and this avoidably contributed to contention.
The pipe lock is only held to accomodate MAC and to check the type.
Since normally there is no probe for pipe stat depessimize this by having the
flag.
The pipe_state field gets modified with locks held all the time and it's not
feasible to convert them to use atomic store. Move the type flag away to a
separate variable as a simple cleanup and to provide stable field to read.
Use short for both fields to avoid growing the struct.
While here short-circuit MAC for pipe_poll as well.
Mark Johnston [Thu, 19 Nov 2020 03:59:21 +0000 (03:59 +0000)]
vm_phys: Try to clean up NUMA KPIs
It can useful for code outside the VM system to look up the NUMA domain
of a page backing a virtual or physical address, specifically when
creating NUMA-aware data structures. We have _vm_phys_domain() for
this, but the leading underscore implies that it's an internal function,
and vm_phys.h has dependencies on a number of other headers.
Rename vm_phys_domain() to vm_page_domain(), and _vm_phys_domain() to
vm_phys_domain(). Make the latter an inline function.
Add _vm_phys.h and define struct vm_phys_seg there so that it's easier
to use in other headers. Include it from vm_page.h so that
vm_page_domain() can be defined there.
Include machine/vmparam.h from _vm_phys.h since it depends directly on
some constants defined there.
Mark Johnston [Thu, 19 Nov 2020 02:50:48 +0000 (02:50 +0000)]
Remove NO_EVENTTIMERS support
The arm configs that required it have been removed from the tree.
Removing this option makes the callout code easier to read and
discourages developers from adding new configs without eventtimer
drivers.
Reviewed by: ian, imp, mav
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D27270
Gleb Smirnoff [Thu, 19 Nov 2020 02:20:38 +0000 (02:20 +0000)]
Add '-u' switch that would uncompress cores that were compressed by
kernel during dump time.
A real life scenario is that cores are compressed to reduce
size of dumpon partition, but we either don't care about space
in the /var/crash or we have a filesystem level compression of
/var/crash. And we want cores to be uncompressed in /var/crash
because we'd like to instantily read them with kgdb. In this
case we want kernel to write cores compressed, but savecore(1)
write them uncompressed.
Ed Maste [Thu, 19 Nov 2020 00:03:15 +0000 (00:03 +0000)]
libc: fix undefined behavior from signed overflow in strstr and memmem
unsigned char promotes to int, which can overflow when shifted left by
24 bits or more. this has been reported multiple times but then
forgotten. it's expected to be benign UB, but can trap when built with
explicit overflow catching (ubsan or similar). fix it now.
note that promotion to uint32_t is safe and portable even outside of
the assumptions usually made in musl, since either uint32_t has rank
at least unsigned int, so that no further default promotions happen,
or int is wide enough that the shift can't overflow. this is a
desirable property to have in case someone wants to reuse the code
elsewhere.
Ed Maste [Thu, 19 Nov 2020 00:02:12 +0000 (00:02 +0000)]
libc: optimize memmem two-way bad character shift
first, the condition (mem && k < p) is redundant, because mem being
nonzero implies the needle is periodic with period exactly p, in which
case any byte that appears in the needle must appear in the last p
bytes of the needle, bounding the shift (k) by p.
second, the whole point of replacing the shift k by mem (=l-p) is to
prevent shifting by less than mem when discarding the memory on shift,
in which case linear time could not be guaranteed. but as written, the
check also replaced shifts greater than mem by mem, reducing the
benefit of the shift. there is no possible benefit to this reduction of
the shift; since mem is being cleared, the full shift is valid and
more optimal. so only replace the shift by mem when it would be less
than mem.
Mariusz Zaborski [Wed, 18 Nov 2020 21:07:08 +0000 (21:07 +0000)]
jail: introduce per jail suser_enabled setting
The suser_enable sysctl allows to remove a privileged rights from uid 0.
This change introduce per jail setting which allow to make root a
normal user.
Dimitry Andric [Wed, 18 Nov 2020 19:55:24 +0000 (19:55 +0000)]
For llvm's internal function which retrieves the number of available
"hardware threads", use cpuset_getaffinity(2) on FreeBSD, so it will
honor processor sets configured by the cpuset(1) command.
This should make it possible to avoid e.g. lld creating a huge number of
threads on a machine with many cores, even for linking simple programs.
Mateusz Guzik [Wed, 18 Nov 2020 19:47:24 +0000 (19:47 +0000)]
fd: reorder struct file to reduce false sharing
The size on LP64 is 80 bytes, which is just more than a cacheline, does
not lend itself to easy shrinking and rounding up to 2 would be a huge
waste given NOFREE marker.
The least which can be done is to reorder it so that most commonly used
fields are less likely to span different lines, and consequently suffer
less false sharing.
With the change at hand most commonly used fields land in the same line
about 3/4 of the time, as opposed to 2/4.
Stefan Eßer [Wed, 18 Nov 2020 19:44:30 +0000 (19:44 +0000)]
Add function getlocalbase() to libutil.
This function returns the path to the local software base directory, by
default "/usr/local" (or the value of _PATH_LOCALBASE in include/paths.h
when building the world).
The value returned can be overridden by 2 methods:
- the LOCALBASE environment variable (ignored by SUID programs)
- else a non-default user.localbase sysctl value
msun tests: use standard floating-point exception flags on lrint and fenv tests
Some platforms have additional architecture-specific floating-point flags.
Msun test cases lrint and test_fegsetenv (fenv) expects only standard flags,
so make sure to mask them appropriately.
This makes test pass on PowerPC64.
Reviewed by: jhibbits, ngie
Sponsored by: Eldorado Research Institute (eldorado.org.br)
Differential Revision: https://reviews.freebsd.org/D27202
Warner Losh [Wed, 18 Nov 2020 19:22:24 +0000 (19:22 +0000)]
mergemaster: handle symbolic links during update.
/etc/os-release is now a symbolic link to a generated file. Make
mergemaster cope with symbolic links generically. I'm no longer
a big mergemaster user, so this has only been lightly tested
by me, though Kimura-san has ran it through its paces.
Dimitry Andric [Wed, 18 Nov 2020 18:40:58 +0000 (18:40 +0000)]
When elftoolchain's objcopy (or strip) is rewriting a file in-place,
make it create the temporary file in the same directory as the source
file by default, instead of always using $TMPDIR or /tmp. If creating
that file fails because the directory is not writable, also fallback to
$TMPDIR or /tmp.
This has also been submitted upstream as:
https://sourceforge.net/p/elftoolchain/tickets/597/
Marcin Wojtas [Wed, 18 Nov 2020 15:17:55 +0000 (15:17 +0000)]
Add ENI metrics for the ENA driver
The new HAL allows the driver to read extra ENI stats. Exact meaning of
each of them can be found in base/ena_defs/ena_admin_defs.h file and
structure ena_admin_eni_stats.
Those stats are being updated inside of the timer service, which is
executed every second.
ENI metrics are turned off by default. They can be enabled, using the
sysctl node: dev.ena.X.eni_metrics.update_delay
0 value in this node means that the update is turned off. Other values
determine how many seconds must pass, before ENI metrics will be
updated.
Marcin Wojtas [Wed, 18 Nov 2020 15:07:34 +0000 (15:07 +0000)]
Add SPDX license tag to the ENA driver files
Refering to guide: https://wiki.freebsd.org/SPDX the SPDX tag should not
replace the standard license text, however it should be added over the
standard license text to make the automation easier.
Because of that, the old license was kept, but the SPDX tag was added
on top of every ENA driver file.
Marcin Wojtas [Wed, 18 Nov 2020 15:02:12 +0000 (15:02 +0000)]
Add Rx offsets support for the ENA driver
For the first descriptor in a chain the data may start at an offset.
It is optional feature of some devices, so the driver must ack that
it supports it.
The data pointer of the mbuf is simply shifted by the given value.
Marcin Wojtas [Wed, 18 Nov 2020 14:59:22 +0000 (14:59 +0000)]
Adjust ENA driver files to latest ena-com changes
* Use the new API of ena_trace_*
* Fix typo syndrom --> syndrome
* Remove validation of the Rx req ID (already performed in the ena-com)
* Remove usage of deprecated ENA_ASSERT macro
Andrew Gallatin [Wed, 18 Nov 2020 14:55:49 +0000 (14:55 +0000)]
LACP: When suppressing distributing, return ENOBUFS
When links come and go, lacp goes into a "suppress distributing" mode
where it drops traffic for 3 seconds. When in this mode, lagg/lacp
historiclally drops traffic with ENETDOWN. That return value causes TCP
to close any connection where it gets that value back from the lower
parts of the stack. This means that any TCP connection with active
traffic during a 3-second windown when an LACP link comes or goes
would get closed.
TCP treats return values of ENOBUFS as transient errors, and re-schedules
transmission later. So rather than returning ENETDOWN, lets
return ENOBUFS instead. This allows TCP connections to be preserved.
I've tested this by repeatedly bouncing links on a Netlfix CDN server
under a moderate (20Gb/s) load and overved ENOBUFS reported back to
the TCP stack (as reported by a RACK TCP sysctl).
Marcin Wojtas [Wed, 18 Nov 2020 14:50:12 +0000 (14:50 +0000)]
Fix completion descriptors alignment for the ENA
The latest generation hardware requires IO CQ (completion queue)
descriptors memory to be aligned to a 4K. It needs that feature for
the best performance.
Allocating unaligned descriptors will have a big performance impact as
the packet processing in a HW won't be optimized properly. For that
purpose adjust ena_dma_alloc() to support it.
It's a critical fix, especially for the arm64 EC2 instances.
Marcin Wojtas [Wed, 18 Nov 2020 14:30:59 +0000 (14:30 +0000)]
ena-com: Fix ena-com to allocate cdesc aligned to 4k
The latest generation hardware requires IO CQ (completion queue)
descriptors memory to be aligned to a 4K. It needs that feature for
the best performance.
Allocating unaligned descriptors will have a big performance impact as
the packet processing in a HW won't be optimized properly.
It's a critical fix, especially for the arm64 EC2 instances.
Alan Somers [Wed, 18 Nov 2020 04:35:49 +0000 (04:35 +0000)]
nfs: Mark unused statistics variable as reserved
FreeBSD's NFS exporter has long exported some unused statistics fields.
Revision r366992 removed them from nfsstat. This revision renames those
fields in the kernel's exported structures to make it clear to other
consumers that they are unused.
Alexander Motin [Wed, 18 Nov 2020 03:43:03 +0000 (03:43 +0000)]
Move ecmd memory allocation itto separate DMA tag.
Ecmd memory is not directly related to the request queue, only referenced
from it sometimes in target mode. Separate allocation should be easier
in case of fragmented memory and can be skipped when target is not built.
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