aio code and are registered via the recently added SYSCALL32_*() helpers.
- Since the aio code likes to invoke fuword and suword a lot down in the
"bowels" of system calls, add a structure holding a set of operations for
things like storing errors, copying in the aiocb structure, storing
status, etc. The 32-bit system calls use a separate operations vector to
handle fuword32 vs fuword, etc. Also, the oldsigevent handling is now
done by having seperate operation vectors with different aiocb copyin
routines.
- Split out kern_foo() functions for the various AIO system calls so the
32-bit front ends can manage things like copying in and converting
timespec structures, etc.
- For both the native and 32-bit aio_suspend() and lio_listio() calls,
just use copyin() to read the array of aiocb pointers instead of using
a for loop that iterated over fuword/fuword32. The error handling in
the old case was incomplete (lio_listio() just ignored any aiocb's that
it got an EFAULT trying to read rather than reporting an error), and
possibly slower.
MFC after: 1 month
causes data corruption in combination with certain bridges.
Information about this problem was kindly provided by davidch. [1]
- As BGE_FLAG_PCIX is meant to indicate that the controller is in
PCI-X mode, revert to the pre __FreeBSD_version 602101 method of
reading the bus mode register rather than checking the mere
existence of a PCI-X capability, which is also there when the
NIC f.e. is put into a 32-bit slot causing it not to be in PCI-X
mode. Setting BGE_FLAG_PCIX inappropriately could cause the NIC
to be tuned incorrectly.
PR: 128833 [1]
Reviewed by: jhb
MFC after: 3 days
When VLAN tagged frame is received the hardware sets 'LONG' bit of
Rx status word. It is always set when the size of received frame
exceeded 1518 bytes, including CRC. This VLAN tagged frame clears
'OK' bit of Rx status word such that driver should not rely on 'OK'
bit of Rx status word to pass the VLAN tagged frame to upper stack.
To fix the bug, don't use SIS_CMDSTS_PKT_OK for Rx error check and
introduce SIS_RXSTAT_ERROR macro that checks Rx errors. If we are
configured to accept VLAN tagged frames and the received frame size
is less than or equal to maximum allowed length of VLAN tagged
frame, clear 'LONG' bit of Rx status word before checking Rx
errors.
Reported by: Vladimir Ermako < samflanker <> gmail DOT com >
Tested by: Vladimir Ermako < samflanker <> gmail DOT com >
This change was erronously ommitted from the r185690, and attempt
to simply add the prototype to string.h has revealed that several
contributed programs defined local prototypes for strndup(), controlled
by autoconfed config.h. So, manually change #undef HAVE_STRNDUP to
#define HAVE_STRNDUP 1. Next import of the corresponding program would
regenerate config.h, overriding the changes in this commit.
No objections from: kan
to read-locking in the TCP input path, allowing greater TCP
input parallelism where multiple ithreads or ithread and netisr
are able to run in parallel. Previously, most TCP input paths
held a write lock on the global tcbinfo lock, effectively
serializing TCP input.
Before looking up the connection, acquire a write lock if a
potentially state-changing flag is set on the TCP segment header
(FIN, RST, SYN), and otherwise a read lock. We may later have
to upgrade to a write lock in certain cases (ACKs received by the
syncache or during TIMEWAIT) in order to support global state
transitions, but this is never required for steady-state packets.
Upgrading from a write lock to a read lock must be done as a
trylock operation to avoid deadlocks, and actually violates the
lock order as the tcbinfo lock preceeds the inpcb lock held at
the time of upgrade. If the trylock fails, we bump the refcount
on the inpcb, drop both locks, and re-acquire in-order. If
another thread has freed the connection while the locks are
dropped, we free the inpcb and repeat the lookup (this should
hardly ever or never happen in practice).
For now, maintain a number of new counters measuring how many
times various cases execute, and in particular whether various
optimistic assumptions about when read locks can be used, whether
upgrades are done using the fast path, and whether connections
close in practice in the above-described race, actually occur.
MFC after: 6 weeks
Discussed with: kmacy
Reviewed by: bz, gnn, kmacy
Tested by: kmacy
incremented using in_pcbref(), and decremented using in_pcbfree()
or inpcbrele(). Protocols using only current in_pcballoc() and
in_pcbfree() calls will see the same semantics, but it is now
possible for TCP to call in_pcbref() and in_pcbrele() to prevent
an inpcb from being freed when both tcbinfo and per-inpcb locks
are released. This makes it possible to safely transition from
holding only the inpcb lock to both tcbinfo and inpcb lock
without re-looking up a connection in the input path, timer
path, etc.
Notice that in_pcbrele() does not unlock the connection after
decrementing the refcount, if the connection remains, so that
the caller can continue to use it; in_pcbrele() returns a flag
indicating whether or not the inpcb pointer is still valid, and
in_pcbfee() is now a simple wrapper around in_pcbrele().
MFC after: 1 month
Discussed with: bz, kmacy
Reviewed by: bz, gnn, kmacy
Tested by: kmacy
message for r185765.
Noted by: rdivacky
Requested by: des
Commit message for r185765 should be:
In procfs map handler, and in linprocfs maps handler, do not call
vn_fullpath() while having vm map locked. This is done in anticipation
of the vop_vptocnp commit, that would make vn_fullpath sometime
acquire vnode lock.
Also, in linprocfs, maps handler already acquires vnode lock.
No objections from: des
MFC after: 2 week
sbuf instead of doing uiomove. This allows for reads from non-zero
offsets to work.
Patch is forward-ported des@' one, and was adopted to current code
by dchagin@ and me.
Reviewed by: des (linprocfs part)
PR: kern/101453
MFC after: 1 week
does final drop of the the dq reference to put it onto the free list.
There is a possibility that the dq would be found by another thread
after sync and before the dqh lock is acquired. If that other thread
drops the dq before we have taken the dqh lock, the dirty dq is put on
the free list.
Recheck the DQ_MOD after the dqh lock is relocked. Repeat dqsync() if
the dq is dirty. This ensures that up to date dq is written in the quota
file and fixes assertion in dqget().
Reported and tested by: Frode Nordahl <frode nordahl net>
MFC after: 3 days
Waiting for 1ms for each GMII register access looks overkill and it
may also decrease overall performance of driver because re(4)
invokes mii_tick for every hz.
Tested by: rpaulo
laptops. This includes battery presence detection, charging status, current
and voltage readouts, and charge level indication. The sysctl interface
is somewhat ACPI-like.
established a valid link or not. In miibus_statchg handler add a
check for established link is valid one for the controller(e.g.
1000baseT is not a valid link for fastethernet controllers.)
o Added a flag RE_FLAG_FASTETHER to mark fastethernet controllers.
o Added additional check to know whether we've really encountered
watchdog timeouts or missed Tx completion interrupts. This change
may help to track down the cause of watchdog timeouts.
o In interrupt handler, removed a check for link state change
interrupt. Not all controllers have the bit and re(4) did not
rely on the event for a long time. In addition, re(4) didn't
request the interrupt in RL_IMR register.
Tested by: rpaulo
drivers, there should be a 1us delay after every write when
bit-banging the MII. Also insert barriers in order to ensure
the intended ordering. These changes hopefully will solve the
bus wedging occasionally experienced with DM9102A since r182461.
- Deobfuscate dc_mii_readreg() a bit.
