If the command to be ran changes then a rebuild is caused. Checking
exists(${DESTDIR}...) from make results in this on the 2nd and
possibly subsequent builds due to staging during build. Avoid this
by always running the existence check in the make sh command.
Previously, with serseq enabled, next command was unblocked only after
previous completed. With this change, for read operations, next command
is unblocked as soon as last media read completed. This is important
for frontends that actually wait for data move completion (like camtgt),
or when data are moved through the HA link, or especially when both.
Kernel part of reroot support - a way to change rootfs without reboot.
Note that the mountlist manipulations are somewhat fragile, and not very
pretty. The reason for this is to avoid changing vfs_mountroot(), which
is (obviously) rather mission-critical, but not very well documented,
and thus hard to test properly. It might be possible to rework it to use
its own simple root mount mechanism instead of vfs_mountroot().
Reviewed by: kib@
MFC after: 1 month
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D2698
Do not execute exception handlers with disabled interrupts.
We should not call vm_fault(), or send a signal, with interrupts
disabled. MI kernel code is not prepared for such environment, not to
mention that this increases system latency, since code appears to be
executing as being under spinlock.
The FAR register for data aborts is read before the interrupts are
enabled, to avoid its corruption due to nested exception or context
switch.
Add asserts, similar to the checks done by other architectures, about
not taking page faults in non-sleepable contexts, rather than die with
late and somewhat confusing witness diagnostic.
Reviewed by: andrew
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3669
adrian [Fri, 18 Sep 2015 07:55:33 +0000 (07:55 +0000)]
Add in a temporary (hah!) workaround for net80211 scanning versus NIC
requirements.
Don't start the opmode and join path until a pending survey is finished.
This seems to reliably fix things.
Ideally I'd just finish off the net80211 pluggable scan stuff and implement
the methods here so if_rsu can just drive the scan machinery.
However, that's a .. later thing.
Whilst here, remove the getbuf debugging; it's okay to run out of transmit
buffers under load; it however isn't okay to not be able to send commands.
I'll fix that later.
adrian [Fri, 18 Sep 2015 05:01:05 +0000 (05:01 +0000)]
Add an external facing function to manually set the RX A-MPDU parameters
for re-ordering.
Devices like if_rsu don't pass through action/management frames but do send
firmware commands to inform us of things. One of those notifications is
the RX A-MPDU negotiated parameters.
adrian [Fri, 18 Sep 2015 04:12:11 +0000 (04:12 +0000)]
Add initial 11n support to if_rsu.
* Add a tunable to enable 11n if it's available, so to not anger people
who upgrade.
kenv hw.usb.rsu.enable_11n=1 before inserting the device.
* Add initial 11n htconfig bits;
* Enable 40MHz mode if it's available;
* Add 11n channels;
* Set 11n bits in the firmware.
It works for RX; I haven't tested TX aggregation just yet.
However the firmware doesn't do RX re-ordering, so I have to tie it into
the net80211 A-MPDU RX reorder path before I flip this on by default.
I've verified that I'm indeed actually seeing MCS 0->7 rates being received.
I haven't dug into whether it's actually transmitting 11n rates; I'll dig into
that later.
Eliminate (many) unnecessary calls to pmap_remove_all(). Pages from objects
with a reference count of zero can't possibly be mapped, so there is never a
need for vm_page_set_invalid() to call pmap_remove_all() on them.
The EFI boot loader allocates a single chunk of contiguous memory to
hold the kernel, modules, and any other loaded data. This memory block
is relocated to the kernel's expected location during the transfer of
control from the loader to the kernel.
The GENERIC kernel on amd64 has recently grown such that a kernel + zfs.ko
no longer fits in the default staging size. Bump the default size from
32MB to 48MB to provide more breathing room.
Fix /sbin/route to never look up (invalid) interface names through DNS
/sbin/route has a bug where if it is passed an interface name that does
not exist, it falls through and winds up interpreting it as a hostname.
It fails out eventually, but on a system where DNS lookup is broken you
can end up waiting for up to 60 seconds waiting for the DNS lookup to
timeout. I'm not quite sure what happens if the DNS lookup somehow
succeeds but I doubt that can end well.
Fix makeman creating obj directories due to turning on WITH_AUTO_OBJ.
r284708 addressed this slightly but seems to have put the make(showconfig)
guard in the wrong place. Rather than guard setting the default obj directory,
guard inclusion of auto.obj.mk. This avoids creating SRCTOP/obj and
SRCTOP/release/obj when running makeman.
adrian [Thu, 17 Sep 2015 04:45:29 +0000 (04:45 +0000)]
Bring over the QoS logic from the Linux r92su driver.
* the tx descriptor TID is priority, not TID.
* the tx descriptor queue id mapping is separate from the
TID/priority; rather than just "BE".
TODO:
* go and re-re-re-verify the queue mappings; the linux and openbsd
mappings aren't exactly the same. I need to verify all of this
before I try to flip on 11n RX.
META_MODE: Default OBJROOT to the traditional /usr/src/SRCTOP/.
This avoids easily colliding multiple src trees with the same objects. Having
multiple checkouts in dir/ dir2/ dir3/ would all use obj/ without any unique
identifier inside of obj/. This pattern is more likely to be used due
to the non-META_MODE behavior working with it fine.
In environments where ../obj/ is wanted as the obj directory the value of
OBJROOT can be set to ${SRCTOP:H}/obj/ instead via src-env.conf (set by
SRC_ENV_CONF) or environment. For environment it must be single quoted or
escaped. This will be more likely for vendors who are building images or using
NFS for builds. In those cases MAKEOBJDIRPREFIX may already be utilized and
is supported.
META_MODE: Allow MAKEOBJDIRPREFIX to work more closely to its traditional behavior.
The preferred way to modify the object directory root is to use OBJROOT.
However, setting OBJROOT to ${MAKEOBJDIRPREFIX}/${SRCTOP}/ effectively behaves
as expected.
The problem with this before was that setting OBJROOT to contain SRCTOP
resulted in a recursive replacement (/usr/obj/usr/obj/usr/src/). Anchoring to
the start of the path for replacing SRCCTOP in CURDIR resolves this by
avoiding replacing SRCTOP when CURDIR is within the OBJDIR.
adrian [Thu, 17 Sep 2015 03:42:18 +0000 (03:42 +0000)]
Program the firmware setup stuff with the current hardware setup:
* Do 1T1R for now, until we read the config out of ROM and use it.
* Disable turbo mode, I dunno what this is, but the linux drivers
have this disabled.
* Set the firmware endpoints to what we read from USB.
adrian [Thu, 17 Sep 2015 03:01:19 +0000 (03:01 +0000)]
Use DELAY() rather than usb_pause_mtx() - the latter releases the lock
before waiting, which prevents the lock from really acting like
a hardware serialiser. Sigh.
Block secondary ITS instances from attaching on ARM64
Currently FreeBSD supports only single PIC controller. Some systems
that have more than one (like ThunderX dual-socket) fails to boot.
Disable other PICes until proper handling is implemented in the
generic interrupt code.
Reviewed by: imp
Obtained from: Semihalf
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3682
When the system has more than a single PCI domain, the bus numbers
are not unique, thus they cannot be used for "pci" device numbering.
Change bus numbers to -1 (i.e. to-be-determined automatically)
wherever the code did not care about domains.
Reviewed by: jhb
Obtained from: Semihalf
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3406
des [Wed, 16 Sep 2015 23:09:31 +0000 (23:09 +0000)]
If forwarders were specified on the command line, create an empty
resolvconf.conf so that resolvconf won't replace the manually configured
forwarders with dynamically configured ones the next time the lease is
renewed.
In tcp_ctlinput() separate the (ip == NULL) block from the rest of the
function to reduce so many levels of indentation. Style the lines that
got now indentation reduced. No functional change.
META_MODE: Fix OBJROOT ending in two // when it does not yet exist.
This would lead to the 2nd build (after the first with a missing OBJROOT) to
always rebuild everything as the 'command' would have changed due to the path
changing from having // to only /.
Always clear TDB_USERWR before fetching system call arguments. The
TDB_USERWR flag may still be set after a debugger detaches from a
process via PT_DETACH. Previously the flag would never be cleared
forcing a double fetch of the system call arguments for each system
call. Note that the flag cannot be cleared at PT_DETACH time in case
one of the threads in the process is currently stopped in
syscallenter() and the debugger has modified the arguments for that
pending system call before detaching.
When a process group leader exits, all of the processes in the group are
sent SIGHUP and SIGCONT if any of the processes are stopped. Currently this
behavior is triggered for any type of process stop including ptrace() stops
and transient stops for single threading during exit() and execve().
Thus, if a debugger is attached to a process in a group when the leader
exits, the entire group can be HUPed. Instead, only send the signals if a
process in the group is stopped due to SIGSTOP.
Simplify the way of attaching IPv6 link-layer header.
Problem description:
How do we currently perform layer 2 resolution and header imposition:
For IPv4 we have the following chain:
ip_output() -> (ether|atm|whatever)_output() -> arpresolve()
Lookup is done in proper place (link-layer output routine) and it is possible
to provide cached lle data.
For IPv6 situation is more complex:
ip6_output() -> nd6_output() -> nd6_output_ifp() -> (whatever)_output() ->
nd6_storelladdr()
We have ip6_ouput() which calls nd6_output() instead of link output routine.
nd6_output() does the following:
* checks if lle exists, creates it if needed (similar to arpresolve())
* performes lle state transitions (similar to arpresolve())
* calls nd6_output_ifp() which pushes packets to link output routine along
with running SeND/MAC hooks regardless of lle state
(e.g. works as run-hooks placeholder).
After that, iface output routine like ether_output() calls nd6_storelladdr()
which performs lle lookup once again.
As a result, we perform lookup twice for each outgoing packet for most types
of interfaces. We also need to maintain runtime-checked table of 'nd6-free'
interfaces (see nd6_need_cache()).
Fix this behavior by eliminating first ND lookup. To be more specific:
* make all nd6_output() consumers use nd6_output_ifp() instead
* rename nd6_output[_slow]() to nd6_resolve_[slow]()
* convert nd6_resolve() and nd6_resolve_slow() to arpresolve() semantics,
e.g. copy L2 address to buffer instead of pushing packet towards lower
layers
* Make all nd6_storelladdr() users use nd6_resolve()
* eliminate nd6_storelladdr()
The resulting callchain is the following:
ip6_output() -> nd6_output_ifp() -> (whatever)_output() -> nd6_resolve()
Error handling:
Currently sending packet to non-existing la results in ip6_<output|forward>
-> nd6_output() -> nd6_output _lle() which returns 0.
In new scenario packet is propagated to <ether|whatever>_output() ->
nd6_resolve() which will return EWOULDBLOCK, and that result
will be converted to 0.
(And EWOULDBLOCK is actually used by IB/TOE code).
Unify loopback route switching:
* prepare gateway before insertion
* use RTM_CHANGE instead of explicit find/change route
* Remove fib argument from ifa_switch_loopback_route added in r264887:
if old ifp fib differes from new one, that the caller
is doing something wrong
* Make ifa_*_loopback_route call single ifa_maintain_loopback_route().
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