They were only modified to accomodate a redundant assertion.
This runs into problems as lockless lookup can still try to use the vnode
and crash instead of getting an error.
The bug was only present in kernels with INVARIANTS.
Reported by: kevans
It was realized just a little too late that this was a hack that belonged in
individual regex(3)-using applications. It was surrounded in NOTYET and not
implemented in the engine, so remove it.
This is the last of the needed GNU expressions before we can unleash bsdgrep
by default. \b is effectively an agnostic equivalent of \< and \>, while
\B will match every space that isn't making a transition from
nonchar -> char or char -> nonchar.
These are GNU extensions, generally equivalent to ^ and $ except that the
new syntax will not match beginning of line after the first in a multi-line
expression or the end of line before absolute last in a multi-line
expression.
This was introduced and then disabled by default primarily to avoid dealing
with bugs in libgnuregex. rS363823 switched to using libregex for it, so
let's just rip the option out now so we can make sure we're getting tested
with libregex via bsdgrep.
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D27476
Follow-up to r353959 and r368070: do the same for other architectures.
arm32 already seems to use its own .fnstart/.fnend directives, which
appear to be ARM-specific variants of the same thing. Likewise, MIPS
uses .frame directives.
Reviewed by: arichardson
Differential Revision: https://reviews.freebsd.org/D27387
bus_dmamap_sync() ensures that memory that's prepared for PREWRITE can
be DMA'd immediately after it returns. The details differ, but this
mirrors atomic thread release semantics, at least for the buffers
synced.
For non-x86 platforms, bus_dmamap_sync() has the right syncing and
fences. So in the past, wmb() had been omitted for them.
For x86 platforms, the memory ordering is already strong enough to
ensure DMA to the device sees the current contents. As such, we don't
need the wmb() here. It translates to an sfence which is only needed
for writes to regions that have the write combining attribute set or
when some exotic opcodes are used. The nvme driver does neither of
these. Since bus_dmamap_sync() includes atomic_thread_fence_rel, we
can be assured any optimizer won't reorder the bus_dmamap_sync and the
bus_space_write operations. The wmb() was a vestiage of the pre-busdma
version initially committed to the tree.
Reviewed by: kib@, gallatin@, chuck@, mav@
Differential Revision: https://reviews.freebsd.org/D27448
Add an explicit thread fence release before returning from
bus_dmamap_sync. This should be a no-op in practice, but makes
explicit that all ordinary stores will be completed before subsequent
reads/writes to ordinary device memory. On x86, normal memory ordering
is strong enough to generally guarantee this. The fence keeps the
optimizer (likely LTO) from reordering other calls around this.
The other architectures already have calls, as appropriate, that
are equivalent.
Note: On x86, there is one exception to this rule. If you've mapped
memory as write combining, then you will need to add a sfence or
similar. Normally, though, busdma doesn't operate on such memory, and
drivers that do already cope appropriately.
Reviewed by: kib@, gallatin@, chuck@, mav@
Differential Revision: https://reviews.freebsd.org/D27448
Enable in-kernel acceleration of SHA1 and SHA2 operations on arm64 by adding
support for the ossl(4) crypto driver. This uses OpenSSL's assembly routines
under the hood, which will detect and use SHA intrinsics if they are
supported by the CPU.
Reviewed by: jhb
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D27390
Make room for adding arm64 support to this driver by moving the
x86-specific feature parsing to a separate file.
Reviewed by: jhb
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D27388
- Fix kernel stack unwinding end-of-function false-positive
The kernel stack unwinder assumes that any jr $ra indicates the end
of the current function. However, modern compilers generate code
that contains jr $ra at various places inside the function.
- Handle LLD inter-function padding when looking for the start of a
function.
- Use call site for symbol name/offset when unwinding
Currently we use the return address, which will normally just give
an output that's off by 8 from the actual call site. However, for
tail calls, this is particularly bad, as we end up printing the
symbol name for the function that comes after the one that made the
call. Instead we should go back two instructions from the return
address for the unwound program counter.
Submitted by: arichardson (1, 2), jrtc27 (3)
Reviewed by: arichardson
Obtained from: CheriBSD
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D27363
r366857 created a number of problems, tearing down interfaces too
early in shutdown. This resulted in:
- hung ssh sessions when shutting down or rebooting remotely using
shutdown (I've used exec shutdown, for years, as apposed to simply
shutdown).
- NFS mounted filesystems "disappear" prior to unmount.
- dhclient attached to a VLAN on an interface who's parent interface
has already shut down prints errors.
The path forward is to teach lagg(4) and vlan(4) about WOL.
PR: 251531, 251540
PR: 158734, 109980 are broken again
Reported by: jhb, emaste, jtl, Helge Oldach<freebsd_oldach.net>
Martin Birgmeier <d8zNeCFG_aon.at>
MFC after: Immediately
Discussion at: https://reviews.freebsd.org/D27459
struct timex is not 32-bit safe, it uses longs for members.
Provide translation.
Reviewed by: brooks, cy
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D27471
While porting over the local changes from CheriBSD for upstreaming, I
accidentally committed a broken version of find_entry_point(): we have to
return NULL if the value is not found instead of a value with
ep->name == NULL, since the checks in main were changed to check ep instead
of ep->name for NULL.
This only matters if the crunched tool cannot be found using normal lookup
and one of the fallback paths is used, so it's unlikely to be triggered
in rescue. However, I noticed that one of our CheriBSD test scripts was
failing to run commands under `su` on minimal disk images where all
binaries are hardlinks to a `cheribsdbox` tool generated with crunchgen.
This also updates the bootstrapping check in Makefile.inc1 to bootstrap
crunchgen up to the next version bump.
Reviewed By: kevans
Differential Revision: https://reviews.freebsd.org/D27474
bsdgrep switched over to libregex back in r363823 to fill
WITH_GNU_GREP_COMPAT, since libgnuregex in base is quite buggy and libregex
is somewhat functional. Don't build libgnuregex on our account, please.
PRR improves loss recovery and avoids RTOs in a wide range
of scenarios (ACK thinning) over regular SACK loss recovery.
PRR is disabled by default, enable by net.inet.tcp.do_prr = 1.
Performance may be impeded by token bucket rate policers at
the bottleneck, where net.inet.tcp.do_prr_conservate = 1
should be enabled in addition.
Submitted by: Aris Angelogiannopoulos
Sponsored by: NetApp, Inc.
Differential Revision: https://reviews.freebsd.org/D18892
This is a valid scenario that's handled in the various protocol layers where
it makes sense (e.g., tcp_disconnect and sctp_disconnect). Given that it
indicates we should immediately drop the connection, it makes little sense
to sleep on it.
This could lead to panics with INVARIANTS. On non-INVARIANTS kernels, this
could result in the thread hanging until a signal interrupts it if the
protocol does not mark the socket as disconnected for whatever reason.
Reported by: syzbot+e625d92c1dd74e402c81@syzkaller.appspotmail.com
Reviewed by: glebius, markj
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D27407
Multiple consumers like ipfw, netflow or new route lookup algorithms
need to get the prefix data out of struct rtentry.
Instead of providing direct access to the rtentry, create IPv4/IPv6
accessors to abstract struct rtentry internals and avoid including
internal routing headers for external consumers.
While here, move struct route_nhop_data to the public header, so external
customers can actually use lookup functions returning rt&nhop data.
Differential Revision: https://reviews.freebsd.org/D27416
By default, if a TOE TLS socket stops receiving data for more than 5
seconds, revert the connection back to plain TOE mode. This provides
a fallback if the userland SSL library does not support KTLS. In
addition, for client TLS 1.3 sockets using connect(), the TOE socket
blocks before the handshake has completed since the socket option is
only invoked for the final handshake.
The timeout defaults to 5 seconds, but can be changed at boot via the
hw.cxgbe.toe.tls_rx_timeout tunable or for an individual interface via
the dev.<nexus>.toe.tls_rx_timeout sysctl.
Reviewed by: np
MFC after: 2 weeks
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D27470
This includes mbufs waiting for data from sendfile() I/O requests, or
mbufs awaiting encryption for KTLS.
Reviewed by: np
MFC after: 2 weeks
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D27469
If TOE TLS is requested for an unsupported cipher suite or TLS
version, disable TLS processing and fall back to plain TOE. In
addition, if an error occurs when saving the decryption keys in the
card's memory, disable TLS processing and fall back to plain TOE.
Reviewed by: np
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D27468
If a TOE TLS socket ends up using an unsupported TLS version or
ciphersuite, it must be downgraded to a "plain" TOE socket with TLS
encryption/decryption performed on the host. The previous
implementation of this fallback was incomplete and resulted in hung
connections.
Reviewed by: np
MFC after: 2 weeks
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D27467
Implement computeHostNumHardwareThreads() for FreeBSD
This retrieves CPU affinity via FreeBSD's cpuset(2) API, and makes
LLVM respect affinity settings configured by the user via the
cpuset(1) command.
In particular, this allows to reduce the number of threads used on
machines with high core counts, which can interact badly with
parallelized build systems. This is particularly noticable with lld,
which spawns lots of threads even for linking e.g. hello_world!
This fix is related to PR48193, but does not adress the more
fundamental problem, which is that LLVM by default grabs as many CPUs
and/or threads as possible.
Reviewed By: MaskRay
Differential Revision: https://reviews.llvm.org/D92271
Originally by: mjg
MFC after: 1 week
landed upstream:
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.
This will also be submitted upstream.
Submitted by: mjg
As of r365978, minidumps include a copy of dump_avail[]. This is an
array of vm_paddr_t ranges. libkvm walks the array assuming that
sizeof(vm_paddr_t) is equal to the platform "word size", but that's not
correct on some platforms. For instance, i386 uses a 64-bit vm_paddr_t.
Fix the problem by always dumping 64-bit addresses. On platforms where
vm_paddr_t is 32 bits wide, namely arm and mips (sometimes), translate
dump_avail[] to an array of uint64_t ranges. With this change, libkvm
no longer needs to maintain a notion of the target word size, so get rid
of it.
This is a no-op on platforms where sizeof(vm_paddr_t) == 8.
Reviewed by: alc, kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D27082
The sdt module's load handler iterates over SDT linker sets for the
kernel and all loaded modules to create probes and providers defined by
SDT(9). Probes in one module may belong to a provider in a different
module, but when a probe is created we assume that the provider is
already defined. To maintain this invariant, modify the load handler to
perform two separate passes over loaded modules: one to define providers
and the other to define probes.
The problem manifests when loading linux.ko, which depends on
linux_common.ko, which defines providers used by probes defined in
linux.ko.
Reported by: gallatin
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
* uninitialised variable use
* Using AXGBE_SET_ADV() where it was intended; using AXGBE_ADV()
seems wrong and also causes a compiler warning.
Reviewed by: rpokala
Differential Revision: https://reviews.freebsd.org/D26839
Note that the public documentation on dtrace.org fails to mention %T and
incorrectly documents %Y. The latter actually uses format "%Y %b %e %T"
where %b is always in C locale.
Discussed with: markj
MFC after: 1 month
Sponsored by: Panzura
DTS node can have this property which configure the burst length
for both TX and RX if it's the same.
This unbreak if_dwc on Allwinner A20 and possibly other boards that
uses this prop.
Reported by: qroxana <qroxana@mail.ru>
