to do it directly.
Ensure that we re-queue starting transmit upon TX completion.
This solves two issues:
* It stops tx stalls - before this, if the transmit path filled the
mbuf queue then it'd never start another transmit.
* It enforces ordering - this is very required for 802.11n which
requires frames to be transmitted in the order they're queued.
Since everything remotely involved in USB has an unlock/thing/relock
pattern with that mutex, the only way to guarantee TX ordering is
to 100% defer it into a separate thread.
This now survives an iperf test and gets a reliable 30mbit/sec.
Correctly (I hope!) remove net80211 references before doing so.
Just doing a dumb mbufq drain isn't enough.
If enough traffic occurs and the mbuf queue fills up then transmit
stalls (which I'm not fixing in this commit!) but then the mbuf queue
stays full until the driver is removed. There's also the net80211
node refcounting leak.
This just ensures that during rsu_stop and detach the mbuf queue
is purged (and references!) so the queue-full situation can be
recovered from.
This code initializes the GMAC clock and sets the pin mux to rgmii.
It also override the if_dwc defaults to set the alternate descriptor type
and MII clock used on A20.
Tested on cubieboard2 and banana pi.
setup pieces and so (at least) transmit doesn't work.
It'll just fall back to being a straight HT20 device and negotiate
HT20 only.
Tested by: Idwer Vollering <vidwer@gmail.com>
file descriptor opened for complimentary access exists as well.
The implementation of the guarantee is done by counting the
generations of readers and writers opens. We return success and not
EINTR or ERESTART error, when the sleep for complimentary opening is
interrupted, but the generation was changed during the sleep.
Longer explanation: assume there are two threads, A doing open("fifo",
O_RDONLY) and B doing open("fifo", O_WRONLY), and no other threads
either trying to open the fifo, nor there are any file descriptors
referencing the fifo. Before the change, it was possible e.g. for for
thread A to return a valid file descriptor, while thread B returned
EINTR if a signal to B was delivered simultaneously with the wakeup
from A. After the change, in this situation both A::open() and
B::open() succeed and the signal is made "as if" it was noticed
slightly later. Note that the signal actual delivery is not changed,
it is done by ast on syscall return path, so signal handler is still
executed before first instruction after syscall.
See PR for the code demonstrating the issue.
PR: 203162
Reported by: Victor Stinner victor.stinner@gmail.com
Reviewed by: jilles
Tested by: bapt, pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
should not assume that vm_pages_needed will remain set while it sleeps.
Other threads can clear vm_pages_needed by performing a sufficient
number of vm_page_free() calls, e.g., process termination. The effect
of this error was that vm_pageout_worker() would free and/or launder
pages when, in fact, there was no shortage of free pages.
Rewrite a nearby comment to describe all of the possible cases and not
just the most common case. The problem being that the comment made
the most common case seem like the only case.
Reviewed by: kib
MFC after: 1 week
Sponsored by: EMC / Isilon Storage Division
This also adds a newbus interface that allows a SoC to override the
following settings:
- if_dwc specific SoC initialization;
- if_dwc descriptor type;
- if_dwc MII clock.
This seems to be an old version of the hardware descriptors but it is
still in use in a few SoCs (namely Allwinner A20 and Amlogic at least).
Tested on Cubieboard2 and Banana pi.
Tested for regressions on Altera Cyclone by br@ (old version).
Obtained from: NetBSD
