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Cosmetic changes to the code.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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It was found that delays associated with issue and completion of the commands
severely limit performance of the new, fast SD cards. To alleviate this issue
scatter-gather emulation in software is implemented for both dma and pio
transfer modes. Non-block aligned and high memory sg entries are accounted
for.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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Resume should not explicitly check for media type. Instead, it may relay
on success of socket initialization.
Small changes are introduced to tifm_sd_initialize to make it more robust.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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State machine used to to track mmc command state was found to be fragile
and unreliable, making many cards unusable. The safer solution is to perform
all needed checks at every card event.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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To allow for switching of trasfer mode (dma/pio) on a per-request basis,
pio and dma request issue and completion function are now merged.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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host->flags variable was hosting a collection of bits with different
semantics. For clarity, hardware bit masks are now defined as macros,
socket flags represented as bit fields and flags (now cmd_flags) only
hosts command processing modifiers.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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This wait was needed because of the mmc layer failure to wait for completion
of all outstanding commands before host removal. It should be fixed now in
the mmc layer.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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tifm_sd_terminate can only lawfully be called on device removal so it can be
merged with tifm_sd_remove.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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A sysfs attribute reflecting current media type is added.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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Fixes to the adapter resume function to correctly handle all possible cases:
1. Card is removed during suspend
2. Card is inserted during suspend into previously empty socket
3. Card is replaced during suspend by same or different media type card.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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Some details of the device management (create, add, remove) are really
belong to the tifm_core, as they are not hardware specific.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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Some details of the adapter management (create, add, remove) are really
belong to the tifm_core, as they are not hardware specific.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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Remove unneeded conditions and change a sleeping regime a little in the
card type detection routine.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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Freezeable workqueue makes sure that adapter work items (device insertions
and removals) would be handled after the system is fully resumed. Previously
this was achieved by explicit freezing of the kthread.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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Remove code duplicating the kernel functionality and clean up data
structures involved in driver matching.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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Instead of passing transformed value of adapter interrupt status to
socket drivers, implement two separate callbacks - one for card events
and another for dma events.
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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Block completion interrupts occur faster than we can process
them, so just ignore them competely.
Commit also fixes up some incorrect register defines.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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Now that we've fixed our only offender when it comes to strange sg
list, add a check so that future users keep the sg list proper with
regard to transfer size.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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mmc layer may introduce additional (compared to block layer) limits on
request size. Culling of the sg list to match adjusted request size
simplifies the handling of such cases in the low level driver, allowing
it to skip block count checks while processing sg entries.
(fixes for wbsd and sdhci by Pierre Ossman)
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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The Marvell IDE interface on my machine would hit a BUG_ON() in
lib/iomem.c because it was calling ata_pci_init_one() specifying just a
single port on the host, but that would actually end up trying to
initialize two ports, the second one with bogus information.
This fixes "ata_pci_init_one()" so that it actually passes down the
n_ports variable that it got from the low-level driver to the host
allocation routine ("ata_host_alloc_pinfo()"), which results in the ATA
layer actually having the correct port number information.
And in order to make it all work, I also needed to fix a few places that
had incorrectly hard-coded the fact that a host always had exactly two
ports (both ata_pci_init_bmdma() and ata_request_legacy_irqs() would
just always iterate over both ports).
Acked-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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For backwards compatibility, call_platform_enable_wakeup() can return 0
instead of -EIO since we aren't guaranteed to have errno defined.
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Add a kvasprintf() function to complement kasprintf().
No in-tree users yet, but I have some coming up.
[akpm@linux-foundation.org: EXPORT it]
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Keir Fraser <keir@xensource.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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This patch changes the docs and behaviour from "all states valid" to "no
states valid" if no .valid callback is assigned. Users of pm_ops that only
need mem sleep can assign pm_valid_only_mem without any overhead, others
will require more elaborate callbacks.
Now that all users of pm_ops have a .valid callback this is a safe thing to
do and prevents things from getting messy again as they were before.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Pavel Machek <pavel@ucw.cz>
Looks-okay-to: Rafael J. Wysocki <rjw@sisk.pl>
Cc: <linux-pm@lists.linux-foundation.org>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Almost all users of pm_ops only support mem sleep, don't check in .valid and
don't reject any others in .prepare so users can be confused if they check
/sys/power/state, especially when new states are added (these would then
result in s-t-r although they're supposed to be something different).
This patch implements a generic pm_valid_only_mem function that is then
exported for users and puts it to use in almost all existing pm_ops.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: David Brownell <david-b@pacbell.net>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: linux-pm@lists.linux-foundation.org
Cc: Len Brown <lenb@kernel.org>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Greg KH <greg@kroah.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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This patch removes the firmware disk suspend mode which is the wrong approach,
it is supposed to be used for implementing firmware-based disk suspend but
cannot actually be used for that.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: <linux-pm@lists.linux-foundation.org>
Cc: David Brownell <david-b@pacbell.net>
Cc: Len Brown <lenb@kernel.org>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Greg KH <greg@kroah.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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This patch series cleans up some misconceptions about pm_ops. Some users of
the pm_ops structure attempt to use it to stop the user from entering suspend
to disk, this, however, is not possible since the user can always use
"shutdown" in /sys/power/disk and then the pm_ops are never invoked. Also,
platforms that don't support suspend to disk simply should not allow
configuring SOFTWARE_SUSPEND (read the help text on it, it only selects
suspend to disk and nothing else, all the other stuff depends on PM).
The pm_ops structure is actually intended to provide a way to enter
platform-defined sleep states (currently supported states are "standby" and
"mem" (suspend to ram)) and additionally (if SOFTWARE_SUSPEND is configured)
allows a platform to support a platform specific way to enter low-power mode
once everything has been saved to disk. This is currently only used by ACPI
(S4).
This patch:
The pm_ops.pm_disk_mode is used in totally bogus ways since nobody really
seems to understand what it actually does.
This patch clarifies the pm_disk_mode description.
It also removes all the arm and sh users that think they can veto suspend to
disk via pm_ops; not so since the user can always do echo shutdown >
/sys/power/disk, they need to find a better way involving Kconfig or such.
ACPI is the only user left with a non-zero pm_disk_mode.
The patch also sets the default mode to shutdown again, but when a new pm_ops
is registered its pm_disk_mode is selected as default, that way the default
stays for ACPI where it is apparently required.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: David Brownell <david-b@pacbell.net>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: <linux-pm@lists.linux-foundation.org>
Cc: Len Brown <lenb@kernel.org>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Greg KH <greg@kroah.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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We're getting lockdep warnings due to a post-2.6.21-rc7 bugfix.
The xattr_sem can never be taken in the manner described. Internal inodes
are protected by I_PRIVATE. Add the appropriate annotation.
Cc: <stable@kernel.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Today's print_symbol function dumps a kernel symbol with printk. This
patch extends the functionality of kallsyms.c so that the symbol lookup
function may be used without the printk. This is useful for modules that
want to dump symbols elsewhere, for example, to debugfs. I intend to use
the new function call in the GFS2 file system (which will be a separate
patch).
[akpm@linux-foundation.org: build fix]
[clameter@sgi.com: sprint_symbol should return length of string like sprintf]
Signed-off-by: Robert Peterson <rpeterso@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Cc: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Paulo Marques <pmarques@grupopie.com>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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When allocating local ports, do not allow a bind to a port
with a specific local address when a bind to that port with
a wildcard local address already exists.
Noticed by Linus.
Signed-off-by: David S. Miller <davem@davemloft.net>
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I accidently applied an earlier version of Eric Dumazet's patch, from
March 21st. His version from March 30th didn't have these bugs, so
this just interdiffs to the correct patch.
Signed-off-by: David S. Miller <davem@davemloft.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6: (56 commits)
ieee1394: remove garbage from Kconfig
ieee1394: more help in Kconfig
ieee1394: ohci1394: Fix mistake in printk message.
ieee1394: ohci1394: remove unnecessary rcvPhyPkt bit flipping in LinkControl register
ieee1394: ohci1394: fix cosmetic problem in error logging
ieee1394: eth1394: send async streams at S100 on 1394b buses
ieee1394: eth1394: fix error path in module_init
ieee1394: eth1394: correct return codes in hard_start_xmit
ieee1394: eth1394: hard_start_xmit is called in atomic context
ieee1394: eth1394: some conditions are unlikely
ieee1394: eth1394: clean up fragment_overlap
ieee1394: eth1394: don't use alloc_etherdev
ieee1394: eth1394: omit useless set_mac_address callback
ieee1394: eth1394: CONFIG_INET is always defined
ieee1394: eth1394: allow MTU bigger than 1500
ieee1394: unexport highlevel_host_reset
ieee1394: eth1394: contain host reset
ieee1394: eth1394: shorter error messages
ieee1394: eth1394: correct a memset argument
ieee1394: eth1394: refactor .probe and .update
...
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master.kernel.org:/pub/scm/linux/kernel/git/jikos/hid
* 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jikos/hid: (21 commits)
USB HID: don't warn on idVendor == 0
USB HID: add 'quirks' module parameter
USB HID: add support for dynamically-created quirks
USB HID: clarify static quirk handling as squirks
USB HID: encapsulate quirk handling into hid-quirks.c
USB HID: EMS USBII device needs HID_QUIRK_MULTI_INPUT
HID: update copyright and authorship macro
HID: introduce proper zeroing of unused bits in output reports
USB HID: add support for WiseGroup MP-8800 Quad Joypad
USB HID: add FF support for Logitech Force 3D Pro Joystick
USB HID: numlock quirk for dell W7658 keyboard
USB HID: Logitech MX3000 keyboard needs report descriptor quirk
USB HID: extend quirk for Logitech S510 keyboard
USB HID: usbkbd/usbmouse - handle errors when registering devices
USB HID: add QUIRK_HIDDEV for Belkin Flip KVM
HID: enable dead keys on a belkin wireless keyboard
USB HID: Thustmaster firestorm dual power v1 support
USB HID: specify explicit size for hid_blacklist.quirks
USB HID: fix retry & reset logic
USB HID: consolidate vendor/product ids
...
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* master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6: (21 commits)
[IPV4] SNMP: Support OutMcastPkts and OutBcastPkts
[IPV4] SNMP: Support InMcastPkts and InBcastPkts
[IPV4] SNMP: Support InTruncatedPkts
[IPV4] SNMP: Support InNoRoutes
[SNMP]: Add definitions for {In,Out}BcastPkts
[TCP] FRTO: RFC4138 allows Nagle override when new data must be sent
[TCP] FRTO: Delay skb available check until it's mandatory
[XFRM]: Restrict upper layer information by bundle.
[TCP]: Catch skb with S+L bugs earlier
[PATCH] INET : IPV4 UDP lookups converted to a 2 pass algo
[L2TP]: Add the ability to autoload a pppox protocol module.
[SKB]: Introduce skb_queue_walk_safe()
[AF_IUCV/IUCV]: smp_call_function deadlock
[IPV6]: Fix slab corruption running ip6sic
[TCP]: Update references in two old comments
[XFRM]: Export SPD info
[IPV6]: Track device renames in snmp6.
[SCTP]: Fix sctp_getsockopt_local_addrs_old() to use local storage.
[NET]: Remove NETIF_F_INTERNAL_STATS, default to internal stats.
[NETPOLL]: Remove CONFIG_NETPOLL_RX
...
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* 'for-linus' of git://git.kernel.dk/data/git/linux-2.6-block:
[PATCH] elevator: elv_list_lock does not need irq disabling
[BLOCK] Don't pin lots of memory in mempools
cfq-iosched: speedup cic rb lookup
ll_rw_blk: add io_context private pointer
cfq-iosched: get rid of cfqq hash
cfq-iosched: tighten queue request overlap condition
cfq-iosched: improve sync vs async workloads
cfq-iosched: never allow an async queue idling
cfq-iosched: get rid of ->dispatch_slice
cfq-iosched: don't pass unused preemption variable around
cfq-iosched: get rid of ->cur_rr and ->cfq_list
cfq-iosched: slice offset should take ioprio into account
[PATCH] cfq-iosched: style cleanups and comments
cfq-iosched: sort IDLE queues into the rbtree
cfq-iosched: sort RT queues into the rbtree
[PATCH] cfq-iosched: speed up rbtree handling
cfq-iosched: rework the whole round-robin list concept
cfq-iosched: minor updates
cfq-iosched: development update
cfq-iosched: improve preemption for cooperating tasks
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git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
* 'for-2.6.22' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: (255 commits)
[POWERPC] Remove dev_dbg redefinition in drivers/ps3/vuart.c
[POWERPC] remove kernel module option for booke wdt
[POWERPC] Avoid putting cpu node twice
[POWERPC] Spinlock initializer cleanup
[POWERPC] ppc4xx_sgdma needs dma-mapping.h
[POWERPC] arch/powerpc/sysdev/timer.c build fix
[POWERPC] get_property cleanups
[POWERPC] Remove the unused HTDMSOUND driver
[POWERPC] cell: cbe_cpufreq cleanup and crash fix
[POWERPC] Declare enable_kernel_spe in a header
[POWERPC] Add dt_xlate_addr() to bootwrapper
[POWERPC] bootwrapper: CONFIG_ -> CONFIG_DEVICE_TREE
[POWERPC] Don't define a custom bd_t for Xilixn Virtex based boards.
[POWERPC] Add sane defaults for Xilinx EDK generated xparameters files
[POWERPC] Add uartlite boot console driver for the zImage wrapper
[POWERPC] Stop using ppc_sys for Xilinx Virtex boards
[POWERPC] New registration for common Xilinx Virtex ppc405 platform devices
[POWERPC] Merge common virtex header files
[POWERPC] Rework Kconfig dependancies for Xilinx Virtex ppc405 platform
[POWERPC] Clean up cpufreq Kconfig dependencies
...
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A transmitted IP multicast datagram should be counted as OutMcastPkts.
By the same token, a transmitted IP broadcast datagram should be
counted as OutBcastPkts.
Signed-off-by: Mitsuru Chinen <mitch@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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A received IP multicast datagram should be counted as InMcastPkts.
By the same token, a received IP broadcast datagram should be
counted as InBcastPkts.
Signed-off-by: Mitsuru Chinen <mitch@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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An IP datagram which is being discarded because the datagram frame
didn't carry enough data should be counted as InTruncatedPkts.
Signed-off-by: Mitsuru Chinen <mitch@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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An IP datagram which is being discarded because of no routes in the
forwarding path should be counted as InNoRoutes.
Signed-off-by: Mitsuru Chinen <mitch@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The updated IP-MIB RFC (RFC4293) specifys new objects, InBcastPkts
and OutBcastPkts. This adds definitions for them.
Signed-off-by: Mitsuru Chinen <mitch@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This is a corner case where less than MSS sized new data thingie
is awaiting in the send queue. For F-RTO to work correctly, a
new data segment must be sent at certain point or F-RTO cannot
be used at all. RFC4138 allows overriding of Nagle at that
point.
Implementation uses frto_counter states 2 and 3 to distinguish
when Nagle override is needed.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
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No new data is needed until the first ACK comes, so no need to check
for application limitedness until then.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
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On MIPv6 usage, XFRM sub policy is enabled.
When main (IPsec) and sub (MIPv6) policy selectors have the same
address set but different upper layer information (i.e. protocol
number and its ports or type/code), multiple bundle should be created.
However, currently we have issue to use the same bundle created for
the first time with all flows covered by the case.
It is useful for the bundle to have the upper layer information
to be restructured correctly if it does not match with the flow.
1. Bundle was created by two policies
Selector from another policy is added to xfrm_dst.
If the flow does not match the selector, it goes to slow path to
restructure new bundle by single policy.
2. Bundle was created by one policy
Flow cache is added to xfrm_dst as originated one. If the flow does
not match the cache, it goes to slow path to try searching another
policy.
Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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SACKED_ACKED and LOST are mutually exclusive with SACK, thus
having their sum larger than packets_out is bug with SACK.
Eventually these bugs trigger traps in the tcp_clean_rtx_queue
with SACK but it's much more informative to do this here.
Non-SACK TCP, however, could get more than packets_out duplicate
ACKs which each increment sacked_out, so it makes sense to do
this kind of limitting for non-SACK TCP but not for SACK enabled
one. Perhaps the author had the opposite in mind but did the
logic accidently wrong way around? Anyway, the sacked_out
incrementer code for non-SACK already deals this issue before
calling sync_left_out so this trapping can be done
unconditionally.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Some people want to have many UDP sockets, binded to a single port but
many different addresses. We currently hash all those sockets into a
single chain. Processing of incoming packets is very expensive,
because the whole chain must be examined to find the best match.
I chose in this patch to hash UDP sockets with a hash function that
take into account both their port number and address : This has a
drawback because we need two lookups : one with a given address, one
with a wildcard (null) address.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch allows a name "pppox-proto-nnn" to be used in modprobe.conf
to autoload a PPPoX protocol nnn.
Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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It's never grabbed from irq context, so just make it plain spin_lock().
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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Currently we scale the mempool sizes depending on memory installed
in the machine, except for the bio pool itself which sits at a fixed
256 entry pre-allocation.
There's really no point in "optimizing" this OOM path, we just need
enough preallocated to make progress. A single unit is enough, lets
scale it down to 2 just to be on the safe side.
This patch saves ~150kb of pinned kernel memory on a 32-bit box.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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