We need to do the same for other platforms in upcoming patches.
v2:
- s/p/pipe (Ville)
- Call the new helper with the vbl_lock already held. The part it
protects is short, so releasing it between pipes only makes proving
correctness more difficult.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: Resolve conflict with Damien's s/p/pipe/ change.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
In the upcoming patches we'll need to access the rest of the fields in
the punit power gating register, so prepare for that.
v2:
- add doc reference for the power well subsystem IDs (Jesse)
- remove IDs for non-existant DPIO_RX[23] subsystems (Jesse)
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This is a left-over from
commit b7e634cc8d
Author: Imre Deak <imre.deak@intel.com>
Date: Tue Feb 4 21:35:45 2014 +0200
drm/i915: vlv: don't unmask IIR[DISPLAY_PIPE_A/B_VBLANK] interrupt
where we stopped unmasking the vblank IRQs, but left them enabled in the
IER register. Disable them in IER too.
v2:
- remove comment becoming stale after this change (Ville)
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
We can read out the pipe HW state only if the required power domain is
on. If not we consider the pipe to be off.
v2:
- no change
v3:
- push down the power domain checks into the specific crtc
get_pipe_config handlers (Daniel)
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: Appease checkpatch.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Since the encoder is tied to its port, we need to make sure the power
domain for that port is on before reading out the encoder HW state.
Note that this also covers also all connector get_hw_state handlers,
since all those just call the corresponding encoder get_hw_state
handler, which checks - after this change - for all power domains
the connector needs.
v2:
- no change
v3:
- push down the power domain checks into the specific encoder
get_hw_state handlers (Daniel)
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
The connector detect and get_mode handlers need to access the port
specific HW blocks to read the EDID etc. Get/put the port power domains
around these handlers.
v2:
- get port power domain for HDMI too (Ville)
- get port power domain for the DP,HDMI audio detect handlers (Jesse)
- Leave the intel_runtime_pm_get/put in the DP detect function in place.
Instead of just removing them, these should be moved to the appropriate
power_well enable/disable handlers. We can do this after Paulo's
'Merge PC8 with runtime PM, v2' patchset.
v3:
- rebased on latest -nightly
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Parts that poke port specific HW blocks like the encoder HW state
readout or connector hotplug detect code need a way to check whether
required power domains are on or enable/disable these. For this purpose
add a set of power domains that refer to the port HW blocks. Get the
proper port power domains during modeset.
For now when requesting the power domain for a DDI port get it for a 4
lane configuration. This can be optimized later to request only the 2
lane power domain, when proper support is added on the VLV PHY side for
this. Atm, the PHY setup code assumes a 4 lane config in all cases.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reading code free of special cases wins over the small overhead of
calling a noop handler. Suggested by Jesse.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Split the 'set' power well handler into an 'enable', 'disable' and
'sync_hw' handler. This maps more conveniently to higher level
operations, for example it allows us to push the hsw package c8 handling
into the corresponding hsw/bdw enable/disable handlers and the hsw BIOS
hand-over setting into the hsw/bdw sync_hw handler.
No functional change.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: Appease checkpatch's whitespace complaints.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Whenever we request a power domain it has to guarantee that all HW
resources are enabled that are needed to access a HW register associated
with that power domain. In case a register is on an always-on power well
this won't result in turning on a power well, but it may require
enabling some other HW resource. One such resource is the HSW/BDW device
D0 state that is required for all register accesses and thus for all
power wells/power domains.
So far the init power domain (guaranteeing access to all HW registers)
was part of the default i9xx always-on power well, but not the HSW/BDW
always-on power wells. Add the domain to the latter power wells too.
Atm, all the always-on power wells have noop handlers, so this doesn't
change the functionality.
v2:
- clarify semantics of always-on power wells (Paulo)
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
These macros are used only locally, so move them to the .c file.
No functional change.
v2:
- add init power domain to always-on power wells in the following
- separate - patch (Paulo)
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
There are too many oustanding issues:
- Fence handling in the current code is broken. There's a patch series
from me, but it's blocked on and extended review (which includes
writing the testcases).
- IOMMU mapping handling is broken, we need to properly refcount it -
currently it gets destroyed when the first vma is unbound, so way
too early.
- There's a pending reset issue on snb. Since Mika's reset work and
full ppgtt have been pulled in in separate branches and ended up
intermittingly breaking each another it's unclear who's the exact
culprit here.
- We still have persistent evidince of crazy recursion bugs through
vma_unbind and ppgtt_relase, e.g.
https://bugs.freedesktop.org/show_bug.cgi?id=73383
This issue (and a few others meanwhile resolved) have blocked our
performance measuring/tuning group since 3 months.
- Secure batch dispatching is broken. This is blocking Brad Volkin's
command checker work since 3 months.
All these issues are confirmed to only happen when full ppgtt is
enabled, falling back to aliasing ppgtt resolves them. But even
aliasing ppgtt itself still has a regression:
- We currently unconditionally bind objects into the aliasing ppgtt,
which means all priviledged objects like ringbuffers are visible to
unpriviledged access again. On top of that this also breaks the
command checker for aliasing ppgtt, since it can't hide the
validated batch any more.
Furthermore topic/full-ppgtt has never been reviewed:
- Lifetime rules around vma unbinding/release are unclear, resulting
into this awesome hack called ppgtt_release. Which seems to take the
blame for most of the recursion fallout.
- Context/ring init works different on gpu reset than anywhere else.
Such differeneces have in the past always lead to really hard to
track down bugs.
- Aliasing ppgtt is treated in a bunch of places as a real address
space, but it isn't - the real address space is always the global
gtt in that case. This results in a bit a mess between contexts and
ppgtt object, further complication the context/ppgtt/vma lifetime
rules.
- We don't have any docs describing the overall concepts introduced
with full ppgtt. A short, concise overview describing vmas and some
of the strange bits around them (like the unbound vmas used by
execbuf, or the new binding rules) really is needed.
Note that a lot of the post topic/full-ppgtt merge fallout has already
been addressed, this entire list here of 10 issues really only contains
the still outstanding issues.
Finally the 3.15 merge window is approaching and I think we need to
use the remaining time to ensure that our fallback option of using
aliasing ppgtt is in solid shape. Hence I think it's time to throw the
switch. While at it demote the helper from static inline status
because really.
Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Dave Airlie <airlied@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
These functions will be needed by the valleyview specific power well
update functionality added in an upcoming patch, so move them earlier.
No functional change.
v2:
- no change
v3:
- rebase on latest -nightly
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> (v2)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
These functions are used only by a single call site and are simple
enough to just fold them in.
Note that in later patches the parts folded in here are further
simplified as we'll remove hsw_{disable,enable}_package_c8 and the NULL
check of the power well enable/disable handlers. All this means that at
the end intel_display_power_get/put() becomes more understandable as we
don't need to jump between two functions when reading the code.
No functional change.
v2:
- clarify the rational for the change (Chris)
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This patch fixes following checkpatch.pl warning:
WARNING:struct file_operations should normally be const
Signed-off-by: Monam Agarwal <monamagarwal123@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Kernel coding style does not recommend using typedefs for structures, so
remove the t3e3_resp_t typedef.
Fix the following checkpatch warning:
drivers/staging/sbe-2t3e3/ctrl.h:123: WARNING: do not add new typedefs
Signed-off-by: Kristina Martšenko <kristina.martsenko@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Kernel coding style does not recommend using typedefs for structures, so
remove the t3e3_stats_t typedef.
Fix the following checkpatch warning:
drivers/staging/sbe-2t3e3/ctrl.h:107: WARNING: do not add new typedefs
Signed-off-by: Kristina Martšenko <kristina.martsenko@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Kernel coding style does not recommend using typedefs for structures, so
remove the t3e3_param_t typedef.
Fix the following checkpatch warning:
drivers/staging/sbe-2t3e3/ctrl.h:87: WARNING: do not add new typedefs
Signed-off-by: Kristina Martšenko <kristina.martsenko@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Kernel coding style does not recommend using typedefs for structures, so
remove the t3e3_tx_desc_t typedef.
Fix the following checkpatch warning:
drivers/staging/sbe-2t3e3/2t3e3.h:651: WARNING: do not add new typedefs
Signed-off-by: Kristina Martšenko <kristina.martsenko@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Kernel coding style does not recommend using typedefs for structures, so
remove the t3e3_rx_desc_t typedef.
Fix the following checkpatch warning:
drivers/staging/sbe-2t3e3/2t3e3.h:616: WARNING: do not add new typedefs
Signed-off-by: Kristina Martšenko <kristina.martsenko@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This patch fixes an error in 2t3e3.h that (foo*) should be (foo *).
Signed-off-by: Elena Oat <oat.elena@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This patch removes the assignment in an if condition to do away with
the checkpatch warning :'do not use assignment in if condition'.
Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This patch removes the assignment in if conditions to do away with the
checkpatch warning :'do not use assignment in if condition'.
Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Hayes Wang says:
====================
r8152: tx/rx improvement
- Select the suitable spin lock for each function.
- Add additional check to reduce the spin lock.
- Up the priority of the tx to avoid interrupted by rx.
- Support rx checksum, large send, and IPv6 hw checksum.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Support hw IPv6 checksum for TCP and UDP packets.
Note that the hw has the limitation of the range of the transport
offset. Besides, the TCP Pseudo Header of the IPv6 TSO of the hw
bases on the Microsoft document which excludes the packet length.
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Support scatter gather and TSO.
Adjust the tx checksum function and set the max gso size to fix the
size of the tx aggregation buffer.
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Continue dealing with the remain rx packets, even though the allocation
of the skb fail. This could calculate the correct dropped packets.
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
move the tx_bottom() from delayed_work to tasklet. It makes the rx
and tx balanced. If the device is in runtime suspend when getting
the tx packet, wakeup the device before trasmitting.
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Check tx agg list before spin lock to avoid doing spin lock every
times.
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Use spin_lock and spin_unlock in interrupt context.
The ndo_start_xmit would not be called in interrupt context, so
replace the relative spin_lock_irqsave and spin_unlock_irqrestore
with spin_lock_bh and spin_unlock_bh.
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch removes the assignment in if conditions to do away with the
checkpatch warning :'do not use assignment in if condition'.
Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This patch fixes the Sparse Warnings "symbol was
not declared. Should it be static?"
Signed-off-by: Ebru Akagunduz <ebru.akagunduz@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This patch fixes the following checkpatch.pl issues in cxd2099.c
WARNING: line length over 80 characters
Signed-off-by: Monam Agarwal <monamagarwal123@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This patch removes the assignment in if conditions to do away with the
checkpatch warning :'do not use assignment in if condition'.
Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jeff Kirsher says:
====================
Intel Wired LAN Driver Updates
This series contains updates to i40e and i40evf.
Most notable are:
Joseph completes the implementation of the ethtool ntuple rule
management interface by adding the get, update and delete interface
reset.
Akeem provides a fix to prevent a possible overflow due to multiplication
of number and size by using kzalloc, so use kcalloc.
Jesse provides an implementation for skb_set_hash() and adds the L4 type
return when we know it is an L4 hash. He also adds a counter to
statistics for Tx timeouts to help users. Lastly he provides a change
to stay away from the cache line where the done bit may be getting
written back for the transmit ring since the hardware may be writing the
whole cache line for a partial update.
Shannon cleans up code comments.
Anjali removes a firmware workaround for newer firmware since the number
of MSIx vectors are being reported correctly.
v2:
- dropped patch 01 of the series based on feedback from the author
Joe Perches and Shannon Nelson.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1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=PK2i
-----END PGP SIGNATURE-----
Merge tag 'rxrpc-devel-20140304' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
David Howells says:
====================
net-next: AF_RXRPC fixes and development
Here are some AF_RXRPC fixes:
(1) Fix to remove incorrect checksum calculation made during recvmsg(). It's
unnecessary to try to do this there since we check the checksum before
reading the RxRPC header from the packet.
(2) Fix to prevent the sending of an ABORT packet in response to another
ABORT packet and inducing a storm.
(3) Fix UDP MTU calculation from parsing ICMP_FRAG_NEEDED packets where we
don't handle the ICMP packet not specifying an MTU size.
And development patches:
(4) Add sysctls for configuring RxRPC parameters, specifically various delays
pertaining to ACK generation, the time before we resend a packet for
which we don't receive an ACK, the maximum time a call is permitted to
live and the amount of time transport, connection and dead call
information is cached.
(5) Improve ACK packet production by adjusting the handling of ACK_REQUESTED
packets, ignoring the MORE_PACKETS flag, delaying the production of
otherwise immediate ACK_IDLE packets and delaying all ACK_IDLE production
(barring the call termination) to half a second.
(6) Add more sysctl parameters to expose the Rx window size, the maximum
packet size that we're willing to receive and the number of jumbo rxrpc
packets we're willing to handle in a single UDP packet.
(7) Request ACKs on alternate DATA packets so that the other side doesn't
wait till we fill up the Tx window.
(8) Use a RCU hash table to look up the rxrpc_call for an incoming packet
rather than stepping through a hierarchy involving several spinlocks.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Zoltan Kiss says:
====================
xen-netback: TX grant mapping with SKBTX_DEV_ZEROCOPY instead of copy
A long known problem of the upstream netback implementation that on the TX
path (from guest to Dom0) it copies the whole packet from guest memory into
Dom0. That simply became a bottleneck with 10Gb NICs, and generally it's a
huge perfomance penalty. The classic kernel version of netback used grant
mapping, and to get notified when the page can be unmapped, it used page
destructors. Unfortunately that destructor is not an upstreamable solution.
Ian Campbell's skb fragment destructor patch series [1] tried to solve this
problem, however it seems to be very invasive on the network stack's code,
and therefore haven't progressed very well.
This patch series use SKBTX_DEV_ZEROCOPY flags to tell the stack it needs to
know when the skb is freed up. That is the way KVM solved the same problem,
and based on my initial tests it can do the same for us. Avoiding the extra
copy boosted up TX throughput from 6.8 Gbps to 7.9 (I used a slower AMD
Interlagos box, both Dom0 and guest on upstream kernel, on the same NUMA node,
running iperf 2.0.5, and the remote end was a bare metal box on the same 10Gb
switch)
Based on my investigations the packet get only copied if it is delivered to
Dom0 IP stack through deliver_skb, which is due to this [2] patch. This affects
DomU->Dom0 IP traffic and when Dom0 does routing/NAT for the guest. That's a bit
unfortunate, but luckily it doesn't cause a major regression for this usecase.
In the future we should try to eliminate that copy somehow.
There are a few spinoff tasks which will be addressed in separate patches:
- grant copy the header directly instead of map and memcpy. This should help
us avoiding TLB flushing
- use something else than ballooned pages
- fix grant map to use page->index properly
I've tried to broke it down to smaller patches, with mixed results, so I
welcome suggestions on that part as well:
1: Use skb->cb to store pending_idx
2: Some refactoring
3: Change RX path for mapped SKB fragments (moved here to keep bisectability,
review it after #4)
4: Introduce TX grant mapping
5: Remove old TX grant copy definitons and fix indentations
6: Add stat counters for zerocopy
7: Handle guests with too many frags
8: Timeout packets in RX path
9: Aggregate TX unmap operations
v2: I've fixed some smaller things, see the individual patches. I've added a
few new stat counters, and handling the important use case when an older guest
sends lots of slots. Instead of delayed copy now we timeout packets on the RX
path, based on the assumption that otherwise packets should get stucked
anywhere else. Finally some unmap batching to avoid too much TLB flush
v3: Apart from fixing a few things mentioned in responses the important change
is the use the hypercall directly for grant [un]mapping, therefore we can
avoid m2p override.
v4: Now we are using a new grant mapping API to avoid m2p_override. The RX queue
timeout logic changed also.
v5: Only minor fixes based on Wei's comments
v6: Important bugfixes for xenvif_poll exit path and zerocopy callback, see
first 2 patches. Also rework of handling packets with too many slots, and
reorder the series a bit.
v7: Small fixes in comments/log messages/error paths, and merging the frag
overflow stats patch into its parent.
[1] http://lwn.net/Articles/491522/
[2] https://lkml.org/lkml/2012/7/20/363
====================
Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Unmapping causes TLB flushing, therefore we should make it in the largest
possible batches. However we shouldn't starve the guest for too long. So if
the guest has space for at least two big packets and we don't have at least a
quarter ring to unmap, delay it for at most 1 milisec.
Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
A malicious or buggy guest can leave its queue filled indefinitely, in which
case qdisc start to queue packets for that VIF. If those packets came from an
another guest, it can block its slots and prevent shutdown. To avoid that, we
make sure the queue is drained in every 10 seconds.
The QDisc queue in worst case takes 3 round to flush usually.
Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Xen network protocol had implicit dependency on MAX_SKB_FRAGS. Netback has to
handle guests sending up to XEN_NETBK_LEGACY_SLOTS_MAX slots. To achieve that:
- create a new skb
- map the leftover slots to its frags (no linear buffer here!)
- chain it to the previous through skb_shinfo(skb)->frag_list
- map them
- copy and coalesce the frags into a brand new one and send it to the stack
- unmap the 2 old skb's pages
It's also introduces new stat counters, which help determine how often the guest
sends a packet with more than MAX_SKB_FRAGS frags.
NOTE: if bisect brought you here, you should apply the series up until
"xen-netback: Timeout packets in RX path", otherwise malicious guests can block
other guests by not releasing their sent packets.
Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
These counters help determine how often the buffers had to be copied. Also
they help find out if packets are leaked, as if "sent != success + fail",
there are probably packets never freed up properly.
NOTE: if bisect brought you here, you should apply the series up until
"xen-netback: Timeout packets in RX path", otherwise Windows guests can't work
properly and malicious guests can block other guests by not releasing their sent
packets.
Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
These became obsolete with grant mapping. I've left intentionally the
indentations in this way, to improve readability of previous patches.
NOTE: if bisect brought you here, you should apply the series up until
"xen-netback: Timeout packets in RX path", otherwise Windows guests can't work
properly and malicious guests can block other guests by not releasing their sent
packets.
Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch introduces grant mapping on netback TX path. It replaces grant copy
operations, ditching grant copy coalescing along the way. Another solution for
copy coalescing is introduced in "xen-netback: Handle guests with too many
frags", older guests and Windows can broke before that patch applies.
There is a callback (xenvif_zerocopy_callback) from core stack to release the
slots back to the guests when kfree_skb or skb_orphan_frags called. It feeds a
separate dealloc thread, as scheduling NAPI instance from there is inefficient,
therefore we can't do dealloc from the instance.
Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
RX path need to know if the SKB fragments are stored on pages from another
domain.
Logically this patch should be after introducing the grant mapping itself, as
it makes sense only after that. But to keep bisectability, I moved it here. It
shouldn't change any functionality here. xenvif_zerocopy_callback and
ubuf_to_vif are just stubs here, they will be introduced properly later on.
Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch contains a few bits of refactoring before introducing the grant
mapping changes:
- introducing xenvif_tx_pending_slots_available(), as this is used several
times, and will be used more often
- rename the thread to vifX.Y-guest-rx, to signify it does RX work from the
guest point of view
Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Storing the pending_idx at the first byte of the linear buffer never looked
good, skb->cb is a more proper place for this. It also prevents the header to
be directly grant copied there, and we don't have the pending_idx after we
copied the header here, so it's time to change it.
It also introduces helpers for the RX side
Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Hi Greg,
Here's 76 patches to queue to usb-next for 3.15.
The bulk of this rather large pull request is the UAS driver cleanup, the
xHCI streams fixes, and the new userspace API for usbfs to be able to use
and alloc/free bulk streams. I've hammered on these changes, and the UAS
driver seems solid. The performance numbers are pretty spiffy too:
root@xanatos:~# echo 3 > /proc/sys/vm/drop_caches; dd if=/dev/sdb of=/dev/null bs=4k count=1000M iflag=count_bytes
256000+0 records in
256000+0 records out
1048576000 bytes (1.0 GB) copied, 3.28557 s, 319 MB/s
That's about 100 MB/s faster than my fastest Bulk-only-Transport mass
storage drive.
There's a couple of miscellaneous cleanup patches and non-urgent bug fixes
in here as well:
7969943789 xhci: add the meaningful IRQ description if it is empty
bcffae7708 xhci: Prevent runtime pm from autosuspending during initialization
e587b8b270 xhci: make warnings greppable
25cd2882e2 usb/xhci: Change how we indicate a host supports Link PM.
Sarah Sharp
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.14 (GNU/Linux)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=/Do3
-----END PGP SIGNATURE-----
Merge tag 'for-usb-next-2014-03-06' of git://git.kernel.org/pub/scm/linux/kernel/git/sarah/xhci into usb-next
Sarah writes:
xhci: Streams and UAS cleanups, misc cleanups for 3.15
Hi Greg,
Here's 76 patches to queue to usb-next for 3.15.
The bulk of this rather large pull request is the UAS driver cleanup, the
xHCI streams fixes, and the new userspace API for usbfs to be able to use
and alloc/free bulk streams. I've hammered on these changes, and the UAS
driver seems solid. The performance numbers are pretty spiffy too:
root@xanatos:~# echo 3 > /proc/sys/vm/drop_caches; dd if=/dev/sdb of=/dev/null bs=4k count=1000M iflag=count_bytes
256000+0 records in
256000+0 records out
1048576000 bytes (1.0 GB) copied, 3.28557 s, 319 MB/s
That's about 100 MB/s faster than my fastest Bulk-only-Transport mass
storage drive.
There's a couple of miscellaneous cleanup patches and non-urgent bug fixes
in here as well:
7969943789 xhci: add the meaningful IRQ description if it is empty
bcffae7708 xhci: Prevent runtime pm from autosuspending during initialization
e587b8b270 xhci: make warnings greppable
25cd2882e2 usb/xhci: Change how we indicate a host supports Link PM.
Sarah Sharp
The HWA driver does not do anything with transfer notifications after
receiving the first one and the Alereon HWA allows them to be disabled
as a performance optimization. This patch sends a vendor specific
command to the Alereon HWA on startup to disable transfer notifications.
If the command is successful, the DTI system is started immediately
since that would normally be started upon the first reception of a
transfer notification which will no longer be sent.
Signed-off-by: Thomas Pugliese <thomas.pugliese@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
