r358158 tsoome Feb. 20, 2020, 8:53 a.m.
Add missing check of malloc() result.
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r358157 tsoome Feb. 20, 2020, 8:48 a.m.
Add missing check of malloc() result.
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r358156 adrian Feb. 20, 2020, 7:12 a.m.
The epoch stuff with taskqueues works fine if the driver never calls
the receive path in other contexts, but this driver does.  If there was
a chip reset during active receive then part of the reset will call
the receive path to flush out any active packets before reinitialising
the receive queue and that needs to be done with the epoch held.

So:

* make the receive task a normal task again
* explicitly call epoch enter/exit around the legacy and newer DMA
  receive paths
* add a couple of epoch asserts to ensure that the receive packet
  path itself is called with epoch held.

This fixes it on my Atom eeepc laptop (circa 2010!) that I did
all of my initial 802.11n work in this driver and net80211.

Tested:

* AR9285, STA mode

TODO:

* Test on EDMA chipset (AR9380)
* Test in AP/adhoc modes, just to be sure (eg for beacon
  receive processing in particular.)
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r358155 delphij Feb. 20, 2020, 6:45 a.m.
r358154 delphij Feb. 20, 2020, 6:03 a.m.
MFC after:	3 weeks
X-MFC-with:	r358153
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r358153 pfg Feb. 20, 2020, 3:54 a.m.
Document better this file, updating the URL to the IANA registry and closely
match the official services.

For system ports (0 to 1023) we now try to follow the registry closely, noting
some historical differences where applicable.
For the User ports (1024 - 49151) we try to keep some sensible balance only
of services that are likely to be found on FreeBSD/UNIX systems. This attempts
to strike a balance between complexity and usefulness.

As a side effect: drop references to unofficial Kerberos IV which was EOL'ed
on Oct 2006[1]. While it is conceivable some people may still use it in some
very old FreeBSD machines that can't be replaced easily, the use of it is
considered a security risk. Also drop the unofficial netatalk, which we
supported long ago in the kernel but was dropped long ago.

[1] https://web.mit.edu/kerberos/krb4-end-of-life.html

MFC after:	3 weeks (likely to 12-stable only)
Differential Revision:	https://reviews.freebsd.org/D23621
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r358152 hrs Feb. 20, 2020, 3:01 a.m.
fd.

The read built-in command calls read(2) with a 1-byte buffer because
newline characters need to be detected even on a byte stream which
comes from a non-seekable file descriptor.  Because of this, the
following script calls >6,000 read(2) to show a 6KiB file:

 while read IN; do echo "$IN"; done < /COPYRIGHT

When the input byte stream is seekable, it is possible to read a data
block and then reposition the file pointer to where a newline
character found.  This change adds a small buffer to do this and
reduces the number of read(2) calls.

Theoretically, multiple built-in commands reading the same seekable
byte stream in a single pipe chain can share the buffer.  However,
this change just makes a single invocation of the read built-in
allocate a buffer and deallocate it every time for simplicity.
Although this causes read(2) to read the same regions multiple times,
the performance penalty should be small compared to the reduction of
read(2) calls.

Reviewed by:		jilles
MFC after:		1 week
Differential Revision:	https://reviews.freebsd.org/D23747
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r358143 imp Feb. 20, 2020, 1:33 a.m.
Don't convert all lower layer errors to EIO. Instead, pass the actual error up
the stack. This will allow the upper layers that look for ENXIO to react
properly to that signal from the lower layers and, for UFS, unmount the
filesystem.

Reviewed by: kib@
Differential Revision:  https://reviews.freebsd.org/D23755
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r358136 imp Feb. 20, 2020, 12:46 a.m.
smbios used to be an i386 only kinda weird quirk to the x86
architecture. But UEFI picked it up, dusted it off and now it's many
other locations. Make it base technology by moving it to libsa and
fixing up the compliation. The code has issues with unaligned access
still, but that will be addressed in a followup commit.

Differential Revision: https://reviews.freebsd.org/D23660
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r358135 imp Feb. 20, 2020, 12:46 a.m.
Create a ptov() function. It's basically the same as the btx PTOV
macro, but works everywhere. smbios needs this to translate addresses,
but the translation differs between BIOS booting and EFI booting. Make
it a function so one smbios.o can be used everywhere. Provide
definitions for it in the two loaders affected.

Differential Revision: https://reviews.freebsd.org/D23660
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r358134 imp Feb. 20, 2020, 12:34 a.m.
There's no need to spam the console with this error message. If there's an I/O
error, the disk/cam driver will report it at the lower levels. If that's an
actual problem, the upper layers will report that.

Reviewed by: kib@
Differential Revision:  https://reviews.freebsd.org/D23756
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r358133 jeff Feb. 19, 2020, 10:34 p.m.
possible enum in a switch statement.  I verified that this emits nothing
as expected on clang.  radix relies on constant propagation to eliminate
any branching from these access routines.

Reported by:	lwhsu/tinderbox
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r358132 dim Feb. 19, 2020, 9:12 p.m.
Summary:
With COMPILER_FREEBSD_VERSION, we use a numeric value that we bump each
time we make a change that requires re-bootstrapping, but with the
linker variant, we instead take the entire part after "FreeBSD", as in
this example version output:

LLD 9.0.1 (FreeBSD c1a0a213378a458fbea1a5c77b315c7dce08fd05-1300006) (compatible with GNU linkers)

E.g., LINKER_FREEBSD_VERSION is currently being set to
"c1a0a213378a458fbea1a5c77b315c7dce08fd05-1300006".  This means that
*any* new upstream lld version will cause re-bootstrapping.

We should only look at the numerical field we append after a dash
instead.  This review attempts to make it so.

The only thing I am not happy about is the post-processing of awk output
in Makefile.inc1.  I notice that our awk does not have gensub(), so it
can't substitute a numbered sub-regex with \1, \2, etc.  Suggestions
welcome. :)

MFC after:	1 week
Differential Revision: https://reviews.freebsd.org/D23691
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r358130 jeff Feb. 19, 2020, 7:58 p.m.
The tree is kept correct for readers with store barriers and careful
ordering.  The existing object lock serializes writers.  Consumers
will be introduced in later commits.

Reviewed by:	markj, kib
Differential Revision:	https://reviews.freebsd.org/D23446
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r358129 jeff Feb. 19, 2020, 7:51 p.m.
atomic_*_ptr functions.
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