to dequeue a packet.
The tx path was trying to ensure that enough Xenbus TX ring slots existed but
it didn't check to see whether the mbuf TX ring slots were also available.
They get freed in xn_txeof() which occurs after transmission, rather than earlier
on in the process. (The same happens under Linux too.)
Due to whatever reason (CPU use, scheduling, memory constraints, whatever) the
mbuf TX ring may not have enough slots free and would allocate slot 0. This is
used as the freelist head pointer to represent "free" mbuf TX ring slots; setting
this to an actual mbuf value rather than an id crashes the code.
This commit introduces some basic code to track the TX mbuf ring use and then
(hopefully!) ensures that enough slots are free in said TX mbuf ring before it
enters the actual work loop.
A few notes:
* Similar logic needs to be introduced to check there are enough actual slots
available in the xenbuf TX ring. There's some logic which is invoked earlier
but it doesn't hard-check against the number of available ring slots.
Its trivial to do; I'll do it in a subsequent commit.
* As I've now commented in the source, it is likely possible to deadlock the
driver under certain conditions where the rings aren't receiving any changes
(which I should enumerate) and thus Xen doesn't send any further software
interrupts. I need to make sure that the timer(s) are running right and
the queues are periodically kicked.
PR: 134926
Slot 0 must always remain "free" and be a pointer to the first free entry in the
mbuf descriptor list. It is thus an error to have code allocate or push slot 0
back into the list.
current NFSv4 ACLs, as defined in sys/acl.h. It still needs a
way to test a mount point for NFSv4 ACL support before it will
work. Until then, the NFSHASNFS4ACL() macro just always returns 0.
Approved by: kib (mentor)
get a quick snapshot of the kernel's symbol table including the symbols
from any loaded modules (the symbols are all merged into one symbol
table). Unlike like other implementations, this ksyms driver maps
memory in the process memory space to store the snapshot at the time
/dev/ksyms is opened. It also checks to see if the process has already
a snapshot open and won't allow it to open /dev/ksyms it again until it
closes first. This prevents kernel and process memory from being
exhausted. Note that /dev/ksyms is used by the lockstat(1) command.
Reviewed by: gallatin kib (freebsd-arch)
Approved by: gnn (mentor)
adds probes for mutexes, reader/writer and shared/exclusive locks to
gather contention statistics and other locking information for
dtrace scripts, the lockstat(1M) command and other potential
consumers.
Reviewed by: attilio jhb jb
Approved by: gnn (mentor)
request to arrive. Previously it would end up returning as soon as the
request length stored in the first two bytes had arrived.
Reviewed by: dwmalone
MFC after: 1 week
about removing a few #ifdefs and providing compatibility wrappers and
VOP implementations to get and set an ACL; ZFS does ACL enforcement all
by itself.
Note that the VOPs are ifdefed out for now, so this change should be
a no-op.
Reviewed by: pjd
that the range of versions of NFS handled by the server can
be limited. The nfsd daemon must be restarted after these
sysctl variables are changed, in order for the change to take
effect.
Approved by: kib (mentor)
that it handles the case of a non-exported NFSv4 root correctly.
Also, delete handling for the case where nd_repstat is already
set in nfs_proc(), since that no longer happens.
Approved by: kib (mentor)
o do not attach DLT_IEEE802_11_RADIO unless both tx and rx headers are
present; this is assumed in the capture code paths
o verify the above with asserts in ieee80211_radiotap_{rx,tx}
o add missing checks for active taps before calling ieee80211_radiotap_rx
PCB, simply embed it in the PCB, avoiding additional memory overhead,
memory allocation overhead, and removing one of the few remaining
uses of dtom() in the network stack.
Restore misplaced spx_ctlinput() from an earlier commit.
MFC after: 1 month
severe silicon bugs that can't handle VLAN hardware tagging as well
as status LE writeback bug. The status LE writeback bug is so
critical we can't trust status word of received frame. To accept
frames on Yukon FE+ A0 msk(4) just do minimal check for received
frames and pass them to upper stack. This means msk(4) can pass
corrupted frames to upper layer. You have been warned!
Also I supposed RX_GMF_FL_THR to be 32bits register but Linux
driver treated it as 16bit register so follow their leads. At least
this does not seem to break msk(4) on Yukon FE+.
Tested by: bz, Tanguy Bouzeloc ( the.zauron <> gmail dot com )
Bruce Cran ( bruce <> cran dot org dot uk )
Michael Reifenberger ( mike <> reifenberger dot com )
Stephen Montgomery-Smith ( stephen <> missouri dot edu )
Yukon FE+ is fast ethernet controller and uses new descriptor
format. Since I don't have this controller, the support code was
written from guess and various feedback from enthusiastic users.
Thanks to all users who patiently tested my initial patches.
Special thanks to Tanguy Bouzeloc who fixed critical bug of initial
patch.
Tested by: bz, Tanguy Bouzeloc ( the.zauron <> gmail dot com )
Bruce Cran ( bruce <> cran dot org dot uk )
Michael Reifenberger ( mike <> reifenberger dot com )
Stephen Montgomery-Smith ( stephen <> missouri dot edu )
The GM_GP_CTRL register may have stale content from previous link
information so clearing it will make hardware update the register
correctly when it established a valid link.
While I'm here remove stale comment.
does not guarantee established link. Also 1000baseT link report for
fast ethernet controller is not valid one so make sure gigabit link
is allowed for this controller.
Whenever we lost link, check whether Rx/Tx MACs were enabled. If both
MAC are not active, do not try to disable it again.
mark controller's capability. Controllers that have jumbo frame
support sets MSK_FLAG_JUMBO, and controllers that does not support
checksum offloading for jumbo frames will set MSK_FLAG_JUMBO_NOCSUM.
For Fast Ethernet controllers it will set MSK_FLAG_FASTETHER and it
would be used in link state handling.
While here, disable Tx checksum offloading if jumbo frame is used
on controllers that does not have Tx checksum offloading capability
for jumbo frame(e.g. Yukon EC Ultra).
FE+ controller. Due to the severe silicon bugs for Yukon FE+,
88E3016 seems to require more workarounds. However I'm not sure
whether the workaround is PHY specific or only applicable to Yukon
FE+. The datasheet for the PHY is publicly available but it lacks
several details for the workaround used in this change. The
workaround information was obtained from Linux. Many thanks to
Yukon FE+ users who helped me add 88E3016 support.
Tested by: bz, Tanguy Bouzeloc ( the.zauron <> gmail dot com )
Bruce Cran ( bruce <> cran dot org dot uk )
Michael Reifenberger ( mike <> reifenberger dot com )
Stephen Montgomery-Smith ( stephen <> missouri dot edu )
advertisement register. Some PHYs such as 88E3016 requires NEXT
Page capability to establish valid link. Also set protocol selector
field which is read only but it makes the intention clearer.
is valid only for auto-negotiation case so check the bit if we know
auto-negotiation is active. While I'm here explicitly checks
current speed with speed mask and set IFM_NONE if resolved speed
is unknown.
checks extended status register to see whether the PHY is fast
ethernet or not. This removes a lot of checks for specific PHY
models and it makes easy to add more PHYs to e1000phy(4).
While I'm here remove setting mii_anegticks as it is set with
mii_phy_add_media().
ReleaseLockOwner operations analagous to what is already
in place for SetClientID and SetClientIDConfirm. These are
the five NFSv4 operations that do not use file handle(s),
so the checks are done using the NFSv4 root export entries
in /etc/exports.
Approved by: kib (mentor)
Remove PAGE_SIZE alignment used in Rx buffer DMA tag creation. The
alignment restriction was used in old local jumbo allocator and
nfe(4) switched to UMA backed page allocator for jumbo frame.
This change should fix jumbo buffer allocation failure.
Reported by: Pascal Braun ( pascal.braun <> continum dot net )
to it for the client side reply. Hopefully this fixes the
problem with using the new krpc for arm for the experimental
nfs client.
Approved by: kib (mentor)
where a client is not allowed NFSv4 access correctly. This
restriction is specified in the "V4: ..." line(s) in
/etc/exports.
Approved by: kib (mentor)
on platforms with strict alignment requirements. In particular, this fixes the
problems with the new RPC transport on the arm platform.
Note: this adds yet another copy of nfs_realign(). I will attempt to refactor
after NFS_LEGACYRPC is removed.
Submitted by: sam
sleep waiting for conditions when the lock may be granted.
To prevent lf_setlock() from accessing possibly freed memory, add reference
counting to the struct lockf_entry. Bump refcount around the sleep.
Make lf_free_lock() return non-zero when structure was freed, and use
this after the sleep to return EINTR to the caller. The error code might
need a clarification, but we cannot return success to usermode, since
the lock is not owned anymore.
Reviewed by: dfr
Tested by: pho
MFC after: 1 month
is acquired. In the lf_purgelocks(), assert that vnode is doomed and set
*statep to NULL before clearing ls_pending list. Otherwise, we allow for
the thread executing lf_advlockasync() to put new pending entry after
state->ls_lock is dropped in lf_purgelocks().
Reviewed by: dfr
Tested by: pho
MFC after: 1 month
In the original MPSAFE TTY code, I changed the behaviour by returning
EBUSY. I thought this made more sense, because it's basically a race to
see who gets the TTY first.
It turns out this is not a good change, because it also causes EBUSY to
be returned when another process is closing the TTY. This can happen
during startup, when /etc/rc (or one of its children) is still busy
draining its data and /sbin/init is attempting to open the TTY to spawn
a getty.
Reported by: bz
Tested by: bz
case of a kerberized mount without a host based principal
name. This will only work for mounts being done by a user
other than root. Support for a host based principal name
will not work until proposed changes to the rpcsec_gss part
of the krpc are committed. It now builds for "options KGSSAPI".
Approved by: kib (mentor)
vimage options along with all the defines made things really hard to
read and get right; thus add comments for the #else/#endif cases.
Discussed with: zec
to optionally have overlapping unit numbers if attached in different
vnets.
At this stage if_loop is the only clonable ifnet class that has been
extended to allow for such overlapping allocation of unit numbers, i.e.
in each vnet it is possible to have a lo0 interface. Other clonable ifnet
classes remain to operate with traditional semantics, i.e. each instance
of a clonable ifnet will be assigned a globally unique unit number,
regardless in which vnet such an ifnet becomes instantiated.
While here, garbage collect unused _lo_list field in struct vnet_net,
as well as improve indentation for #defines in sys/net/vnet.h.
The layout of struct vnet_net has changed, therefore bump
__FreeBSD_version.
This change has no functional impact on nooptions VIMAGE kernel builds.
Reviewed by: bz, brooks
Approved by: julian (mentor)
be named "udp_inpcb" to avoid a naming conflict with tcp[1].
For consistency rename the uma zone for TCP from "inpcb" to "tcp_inpcb".
Found by: rwatson [1]
Discussed with: rwatson
So far the udp_tun_func_t had been (ab)using inp_ppcb for udp in kernel
tunneling callbacks. Move that into the udpcb and add a field for flags
there to be used by upcoming changes instead of sticking udp only flags
into in_pcb flags2.
Bump __FreeBSD_version for ports to detect it and because of vnet* struct
size changes.
Submitted by: jhb (7.x version)
Reviewed by: rwatson
kernel option.
This also permits tuning of the option per virtual network stack, as
well as separately per inet, inet6.
The kernel option is left for a transition period, marked deprecated,
and will be removed soon.
Initially requested by: phk (1 year 1 day ago)
MFC after: 4 weeks
Cryptodev uses UIO structure do get data from userspace and pass it to
cryptographic engines. Initially UIO size is equal to size of data passed to
engine, but if UIO is prepared for hash calculation an additional small space
is created to hold result of operation.
While creating space for the result, UIO I/O vector size is correctly
extended, but uio_resid field in UIO structure is not modified.
As bus_dma code uses uio_resid field to determine size of UIO DMA mapping,
resulting mapping hasn't correct size. This leads to a crash if all the
following conditions are met:
1. Hardware cryptographic accelerator writes result of hash operation
using DMA.
2. Size of input data is less or equal than (n * PAGE_SIZE),
3. Size of input data plus size of hash result is grather than
(n * PAGE_SIZE, where n is the same as in point 2.
This patch fixes this problem by adding size of the extenstion to uio_resid
field in UIO structure.
Submitted by: Piotr Ziecik kosmo ! semihalf dot com
Reviewed by: philip
Obtained from: Semihalf
write fault or while wiring a mapping that must support write access.
In general, this change should reduce the number of traps that occur for
the purpose of setting the modified bit. More specifically, this change
should prevent traps while holding locks in a sysctl handler. See
kern/kern_sysctl.c revisions 1.168 and 1.195 (svn r192160) for further
details.
Tested by: gonzo
the code will build when "options KGSSAPI" is specified
without requiring the proposed changes that add host based
initiator principal support. It will not handle the case where
the client uses a host based initiator principal until those
changes are committed. The code that uses those changes is
#ifdef'd notyet until the krpc rpcsec_changes are committed.
Approved by: kib (mentor)
because struct vnet_net holds the rt_tables[][] for MRT and array size
is compile time dependent. If you had ROUTETABLES set to >1 after
r192011 V_loif was pointing into nonsense leading to strange results
or even panics for some people.
Reviewed by: mz
for reassigning ifnets from one vnet to another.
if_vmove() works by calling a restricted subset of actions normally
executed by if_detach() on an ifnet in the current vnet, and then
switches to the target vnet and executes an appropriate subset of
if_attach() actions there.
if_attach() and if_detach() have become wrapper functions around
if_attach_internal() and if_detach_internal(), where the later
variants have an additional argument, a flag indicating whether a
full attach or detach sequence is to be executed, or only a
restricted subset suitable for moving an ifnet from one vnet to
another. Hence, if_vmove() will not call if_detach() and if_attach()
directly, but will call the if_detach_internal() and
if_attach_internal() variants instead, with the vmove flag set.
While here, staticize ifnet_setbyindex() since it is not referenced
from outside of sys/net/if.c.
Also rename ifccnt field in struct vimage to ifcnt, and do some minor
whitespace garbage collection where appropriate.
This change should have no functional impact on nooptions VIMAGE kernel
builds.
Reviewed by: bz, rwatson, brooks?
Approved by: julian (mentor)
use the newer nmount() style arguments, as is used by mount_nfs.c.
This prepares the kernel code for the use of a mount_nfs.c with
changes for the experimental client integrated into it.
Approved by: kib (mentor)
only if prepping the adapter failed.
Slight adjustment to comments.
Fix a bug whereby downing the interface didn't preven it from
processing packets.
Submitted by: Navdeep Parhar
MFC after: 1 week
writes upon close when a write delegation is held by the client.
This should be safe to do, now that nfsv4 Close operations are
delayed until ncl_inactive() is called for the vnode.
Approved by: kib (mentor)
- controller reset/firmware loading.
- controller level tracing and tracing of capi messages of applications
running with different user credentials.
Reviewed by: rwatson
MFC after: 2 weeks
Some hardware easily comes out of sync with regard to whether the current or
the next control transfer should be stalled, if a stall command is always
issued before receiving the SETUP packet. After this patch the stall command
will only be issued when a transfer should actually be stalled.
Submitted by: Hans Petter Selasky
When enabled all TTY input queue buffers are zeroed when flushing or
closing the TTY. Because TTY input queues are also used to store filled
in passwords, this may be an interesting switch to enable for security
minded people.
1) Add a sysctl that will say what type of PHYs exist on the card.
2) Fix a bug that occurs when an AEL 2005 PHY resets without a transciever
in the card.
3) Unify the PHY link detection code.
Obtained from: Navdeep Parhar
MFC after: 10 days
and down more cleanly. This addresses a problem where if we have the
link flap during boot the driver would lock up the system.
Reviewed by: jhb
MFC after: 1 week
the behaviour alredy present with the further malloc() call in
devctl_notify().
This fixes a bug in the CAM layer where the camisr handler finished to
call camperiphfree() (and subsequently destroy_dev() resulting in a new
dev notify) while the xpt lock is held.
PR: kern/130330
Tested by: Riccardo Torrini <riccardo dot torrini at esaote dot com>
thread. Multiple RAID events in quick succession can cause an additional
bus rescan to be scheduled before an earlier scan has completed. In this
case the driver was attempting to use the same CCB storage for two requests.
PR: kern/130330
Reviewed by: Riccardo Torrini riccardo.torrini | esaote com
MFC after: 1 week
access windows. This eliminates hangs on systems which are configured to use
interleaved mode: prior to this fix we were simply cutting ourselves from
access to the main memory in this case.
Obtained from: Freescale, Semihalf
last year or two's work on routing:
- Combine iproute initialization and flowtable lookup blocks, eliminating
unnecessary tests for known-zero'd iproute fields.
- Add a comment indicating (a) why the route entry returned by the
flowtable is considered stable and (b) that the flowtable lookup must
occur after the setup of the mbuf flow ID.
- Assert the inpcb lock before any use of inpcb fields.
Reviewed by: kmacy
