Otherwise accept filters compiled into the kernel do not preempt
preloaded accept filter modules. Then, the preloaded file registers its
accept filter module before the kernel, and the kernel's attempt fails
since duplicate accept filter list entries are not permitted. This
causes the preloaded file's module to be released, since
module_register_init() does a lookup by name, so the preloaded file is
unloaded, and the accept filter's callback points to random memory since
preload_delete_name() unmaps the file on x86 as of r336505.
Add a new ACCEPT_FILTER_DEFINE macro which wraps the accept filter and
module definitions, and ensures that a module version is defined.
PR: 245870
Reported by: Thomas von Dein <freebsd@daemon.de>
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
The DIC and IDC bits in the CTR_EL0 register signal to the kernel when it
can relax the instruction cache synchronisation operations. The IDC bit
means we can relax cleaning the data cache to the point of unification
while the DIC bit means we don't need to invalidate the instruction cache
for data coherence. In both cases an appropriate barrier is still needed.
For now only implement the case where both bits are set, as is the case
on the Neoverse-N1 as used in the Amazon AWS Graviton 2 CPU. Note that
this behaviour is a optional on the N1 so we may later need to implement
only one or the other bit being set.
There is a tunable to disable each flag on boot.
Testing on a 4 core Graviton 2 instance found a significant improvement
in sys and real time when running "make buildkernel -j4", with no
significant difference in user time.
Reviewed by: markj
Sponsored by: Innovate UK
Differential Revision: https://reviews.freebsd.org/D24853
Previously we would create an isrc for each MSI/MSI-X interrupt. This
causes issues for other interrupt sources in the system, e.g. a GPIO
driver, as they may be unable to allocate interrupts. This works around
this by allocating the isrc only when needed.
Reported by: alisaidi@amazon.com
Reviewed by: mmel
Sponsored by: Innovaate UK
Differential Revision: https://reviews.freebsd.org/D24876
Since handlers are call in a thread context we can simply use a workqueue
to emulate those functions.
The DRM code was patched to do that already, having it in linuxkpi allows us
to not patch the upstream code.
Sponsored-by: The FreeBSD Foundation
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D24859
pci_dev_present shows if a set of pci ids are present in the system.
It just wraps pci_find_device.
Needed by DRMv5.2
Submitted by: Austing Shafer (ashafer@badland.io)
Differential Revision: https://reviews.freebsd.org/D24796
The only difference with init_waitqueue_head is that the name and the
lock class key are provided but we don't use those so use init_waitqueue_head
directly.
Sponsored-by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D24861
cem noted that on FreeBSD snprintf() can not fail and code should not
check for that.
A followup commit will replace the usage of snprintf() in the SCTP
sources with a variadic macro SCTP_SNPRINTF, which will simply map to
snprintf() on FreeBSD and do a checking similar to r361209 on
other platforms.
This is independent of the recently-discussed global change, which is still
in review/discussion stage.
This is effectively a measure for consistency in the ZFS world, where
FreeBSD was the only platform (as far as I could find) that allowed this.
What ZFS exposes is decidedly not useful for any real purposes, to
paraphrase (hopefully faithfully) jhb's findings when exploring this:
The size of a directory in ZFS is the number of directory entries within.
When reading a directory, you would instead get the leading part of its raw
contents; the amount you get being dictated by the "size," i.e. number of
directory entries. There's decidedly (luckily) no stack disclosure happening
here, though the behavior is bizarre and almost certainly a historical
accident.
This change has already been upstreamed to OpenZFS.
MFC after: 1 week
A page (even physmem) can be marked as cache-inhibited. Attempting to use
'dcbz' to zero a page mapped cache-inhibited triggers an alignment
exception, which is fatal in kernel. This was seen when testing hardware
acceleration with X on POWER9.
At some point in the future, this should be changed to a more straight
forward zero loop instead of bzero(), and a similar change be made to the
other pmaps.
Reported by: pkubaj@
Note that in_pcb_lport and in_pcb_lport_dest can be called with a NULL
local address for IPv6 sockets; handle it. Found by syzkaller.
Reported by: cem
MFC after: 1 month
Previously, tcp_connect() would bind a local port before connecting,
forcing the local port to be unique across all outgoing TCP connections
for the address family. Instead, choose a local port after selecting
the destination and the local address, requiring only that the tuple
is unique and does not match a wildcard binding.
Reviewed by: tuexen (rscheff, rrs previous version)
MFC after: 1 month
Sponsored by: Forcepoint LLC
Differential Revision: https://reviews.freebsd.org/D24781
mbuf lists.
This function is currently trivial, but will that will change when
support for building NFS messages in ext_pgs mbufs is added.
Adding support for ext_pgs mbufs is needed for KERN_TLS, which will
be used to implement nfs-over-tls.
This calculate the offset of the end of the member in the given struct.
Needed by DRM in Linux v5.3
Sponsored-by: The FreeBSD Foudation
Differential Revision: https://reviews.freebsd.org/D24849
Same as mutex_init, the lock_class_key argument seems to be only used for
debug in Linux, simply ignore it for now.
Needed by DRM in Linux v5.3
Sponsored-by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D24848
This function decrement the counter and if the result is 0 it acquires
the mutex and returns 1, if not it simply returns 0.
Needed by DRM from Linux v5.3
Sponsored-by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D24847
Currently NH_IS_VALID() simly aliases to RT_LINK_IS_UP(), so we're
checking the same thing twice.
In the near future the implementation of this check will be simpler,
as there are plans to introduce control-plane interface status monitoring
similar to ipfw interface tracker.
This restriction already present in case of indirect mapping, do the same
in case of extents.
PR: 246182
Reported by: Teran McKinney
MFC after: 2 weeks
Make ext2fs compatible with changes introduced in e2fsprogs v1.45.2.
Now the tail of inode bitmap is filled with 0xff pattern explicitly during
bitmap initialization phase to avoid e2fsck error like:
"Padding at end of inode bitmap is not set."
My preivous logic was a bit wrong. This caused transmissions that failed due
to a mix of short and long retries to count intermediate rates as OK if the
LONG retry count indicated some retries had made it to this intermediate rate,
but the SHORT retry count was the one that caused the whole transmit to fail.
Now status is passed in again - and this is the status for the whole transmission -
and then update_stats() does some quick math to see if the current transmission
series hit its long retry count or not before updating things as a success
or failure.
Fix another collateral damage of r357614: netisr is initialised way before
malloc() is available hence it can't use sysctl_handle_string() that
allocates temporary buffer. Handle that internally in
sysctl_netisr_dispatch_policy().
PR: 246114
Reported by: delphij
Reviewed by: kib
Approved by: kib (mentor)
Differential Revision: https://reviews.freebsd.org/D24858
into account and remove the requirement that the MCS rate is "higher" if we're
considering a new rate.
Ok, another fun one.
* In order for reliable non-software retried higher MCS rates, the TX schedules
(inconsistently!) use hard-coded lower rates at the end of the schedule.
Now, hard-coded is a problem because (a) it means that aggregate formation
is limited by the SLOWEST rate, so I never formed large AMDU frames for
3 stream rates, and (b) if the AP disables lower rates as base rates, it
complains about "unknown rix" every frame you transmit at that rate.
So, for now just disable the third and fourth schedule entry for AMPDUs.
Now I'm forming 32k and 64k aggregates for the higher density MCS rates
much more reliably.
It would be much nicer if the rate schedule stuff wasn't fixed but instead
I'd just populate ath_rc_series[] when I fetch the rates. This is all a
holdover of ye olde pre-11n stuff and I really just need to nuke it.
But for now, ye hack.
* The check for "is this MCS rate better" based on MCS itself is just garbage.
It meant things like going MCS0->7 would be fine, and say 0->8->16 is fine,
(as they're equivalent encoding but 1,2,3 spatial streams), BUT it meant
going something like MCS7->11 would fail even though it's likely that
MCS11 would just be better, both for EWMA/BER and throughput.
So for now just use the average tx time. The "right" way for this comparison
would be to compare PHY bitrates rather than MCS / rate indexes, but I'm not
yet there. The bit rates ARE available in the PHY index, but honestly
I have a lot of other cleaning up to here before I think about that.
* Don't include the RTS/CTS retry count (and thus time) into the average tx time
caluation. It just makes temporarily failures make the rate look bad by
QUITE A LOT, as RTS/CTS exchanges are (a) long, and (b) mostly irrelevant
to the actual rate being tried. If we keep hitting RTS/CTS failures then
there's something ELSE wrong on the channel, not our selected rate.
- thr_kill(2) and thr_exit(2) generally (no argument auditing here.
- A set of syscalls for the process descriptor family, specifically:
pdfork(2), pdgetpid(2) and pdkill(2)
For these syscalls, audit the file descriptor. In the case of pdfork(2)
a pointer to an integer (file descriptor) is passed in as an argument.
We audit the post initialized file descriptor (not the random garbage
that would have been passed in). We will also audit the child process
which was created from the fork operation (similar to what is done for
the fork(2) syscall).
pdkill(2) we audit the signal value and fd, and finally pdgetpid(2)
just the file descriptor:
- Following is a sample of the produced audit trails:
header,111,11,pdfork(2),0,Sat May 16 03:07:50 2020, + 394 msec
argument,0,0x39d,child PID
argument,2,0x2,flags
argument,1,0x8,fd
subject,root,root,0,root,0,924,0,0,0.0.0.0
return,success,925
header,79,11,pdgetpid(2),0,Sat May 16 03:07:50 2020, + 394 msec
argument,1,0x8,fd
subject,root,root,0,root,0,924,0,0,0.0.0.0
return,success,0
trailer,79
header,135,11,pdkill(2),0,Sat May 16 03:07:50 2020, + 395 msec
argument,1,0x8,fd
argument,2,0xf,signal
process_ex,root,root,0,root,0,925,0,0,0.0.0.0
subject,root,root,0,root,0,924,0,0,0.0.0.0
return,success,0
trailer,135
MFC after: 1 week
The most likely users of the QORIQ64 config nowadays are users of AmigaOne
X5000 systems, which are desktops. They need a framebuffer and
keyboard/mouse, so add these to the config so it works by default once
drm-current-kmod is installed.
The CU-SeeMe videoconferencing client and associated protocol is at this
point a historical artifact; there is no need to retain support for this
protocol today.
Reviewed by: philip, markj, allanjude
Relnotes: Yes
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D24790
* Fix formatting, cause reasons;
* Put back the "and the chosen rate is within 90% of the current rate" logic;
* Ensure the best rate and the current rate aren't the same; this ...
* ... fixes the packets_since_switch[] tracking to actually conut how many
frames since the rate switched, so now I know how stable stuff is; and
* Ensure that MCS can go up to a higher MCS at this or any other spatial stream.
My previous quick hack attempt was doing > rather than >= so you had to go
to both a higher root MCS rate (0..7) and spatial stream. Eg, you couldn't
go from MCS0 (1ss) to MCS8 (2ss) this way.
The best rate and switching rate logic still have a bunch more work to do
because they're still quite touchy when it comes to average tx time but at least
now it's choosing higher rates correctly when it wants to try a higher rate.
Tested:
* AR9380, STA mode
Some laptops don't send ACPI "lid status changed" notifications upon
opening the lid if the system was currently suspended. In r358219
this was partially fixed, updating the "lid_status" variable upon
resume even if there is no "status changed" notification from ACPI.
Unfortunately the fix in r358219 did not include notifying userland
via devd; this causes problems on systems using upowerd (e.g. KDE),
since upowerd remembers the most recent devd notification about the
lid status rather than querying the sysctl to get the current status.
This showed up as two symptoms when KDE's "When laptop lid closed: Sleep"
option is set:
1. 50% of the time, closing the lid would not trigger S3 sleep.
2. 50% of the time, plugging/unplugging AC power would trigger S3 sleep.
PR: 246477
MFC after: 3 days
Right now we optionally allocate 8 counters per table entry, so in
addition to memory consumed by counters, we require 8 pointers worth of
space in each entry even when counters are not allocated (the default).
Instead, define a UMA zone that returns contiguous per-CPU counter
arrays for use in table entries. On amd64 this reduces sizeof(struct
pfr_kentry) from 216 to 160. The smaller size also results in better
slab efficiency, so memory usage for large tables is reduced by about
28%.
Reviewed by: kp
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D24843
My initial rate control code was .. suboptimal. I wanted to at least get MCS
rates sent, but it didn't do anywhere near enough to handle low signal level links
or remotely keep accurate statistics.
So, 8 years later, here's what I should've done back then.
* Firstly, I wasn't at all tracking packet sizes other than the two buckets
(250 and 1600 bytes.) So, extend it to include 4096, 8192, 16384, 32768 and
65536. I may go add 2048 at some point if I find it's useful.
This is important for a few reasons. First, when forming A-MPDU or AMSDU
aggregates the frame sizes are larger, and thus the TX time calculation
is woefully, increasingly wrong. Secondly, the behaviour of 802.11 channels
isn't some fixed thing, both due to channel conditions and radios themselves.
Notably, there was some observations done a few years ago on 11n chipsets
which noticed longer aggregates showed an increase in failed A-MPDU sub-frame
reception as you got further along in the transmit time. It could be due to
a variety of things - transmitter linearity, channel conditions changing,
frequency/phase drift, etc - but the observation was to potentially form
shorter aggregates to improve BER.
* .. and then modify the ath TX path to report the length of the aggregate sent,
so as the statistics kept would line up with the correct bucket.
* Then on the rate control look-up side - i was also only using the first frame
length for an A-MPDU rate control lookup which isn't good enough here.
So, add a new method that walks the TID software queue for that node to
find out what the likely length of data available is. It isn't ALL of the
data in the queue because we'll only ever send enough data to fit inside the
block-ack window, so limit how many bytes we return to roughly what ath_tx_form_aggr()
would do.
* .. and cache that in the first ath_buf in the aggregate so it and the eventual
AMPDU length can be returned to the rate control code.
* THEN, modify the rate control code to look at them both when deciding which bucket
to attribute the sent frame on. I'm erring on the side of caution and using the
size bucket that the lookup is based on.
Ok, so now the rate lookups and statistics are "more correct". However, MCS rates
are not the same as 11abg rates in that they're not a monotonically incrementing
set of faster rates and you can't assume that just because a given MCS rate fails,
the next higher one wouldn't work better or be a lower average tx time.
So, I had to do a bunch of surgery to the best rate and sample rate math.
This is the bit that's a WIP.
* First, simplify the statistics updates (update_stats()) to do a single pass on
all rates.
* Next, make sure that each rate average tx time is updated based on /its/ failure/success.
Eg if you sent a frame with { MCS15, MCS12, MCS8 } and MCS8 succeeded, MCS15 and MCS
12 would have their average tx time updated for /their/ part of the transmission,
not the whole transmission.
* Next, EWMA wasn't being fully calculated based on the /failures/ in each of the
rate attempts. So, if MCS15, MCS12 failed above but MCS8 didn't, then ensure
that the statistics noted that /all/ subframes failed at those rates, rather than
the eventual set of transmitted/sent frames. This ensures the EWMA /and/ average
TX time are updated correctly.
* When picking a sample rate and initial rate, probe rates aroud the current MCS
but limit it to MCS0..7 /for all spatial streams/, rather than doing crazy things
like hitting MCS7 and then probing MCS8 - MCS8 is basically MCS0 but two spatial
streams. It's a /lot/ slower than MCS7. Also, the reverse is true - if we're at
MCS8 then don't probe MCS7 as part of it, it's not likely to succeed.
* Fix bugs in pick_best_rate() where I was /immediately/ choosing the highest MCS
rate if there weren't any frames yet transmitted. I was defaulting to 25% EWMA and
.. then each comparison would accept the higher rate. Just skip those; sampling
will fill in the details.
So, this seems to work a lot better. It's not perfect; I'm still seeing a lot of
instability around higher MCS rates because there are bursts of loss/retransmissions
that aren't /too/ bad. But i'll keep iterating over this and tidying up my hacks.
Ok, so why this still something I'm poking at? rather than porting minstrel_ht?
ath_rate_sample tries to minimise airtime, not maximise throughput. I have
extended it with an EWMA based on sub-frame success/failures - high MCS rates
that have partially successful receptions still show super short average frame
times, but a /lot/ of retransmits have to happen for that to work.
So for MCS rates I also track this EWMA and ensure that the rates I'm choosing
don't have super crappy packet failures. I don't mind not getting lower
peak throughput versus minstrel_ht; instead I want to see if I can make "minimise
airtime" work well.
Tested:
* AR9380, STA mode
* AR9344, STA mode
* AR9580, STA/AP mode
