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Zhu Yi 2f301227a1 iwlwifi: use paged Rx 
This switches the iwlwifi driver to use paged skb from linear skb for Rx
buffer. So that it relieves some Rx buffer allocation pressure for the
memory subsystem. Currently iwlwifi (4K for 3945) requests 8K bytes for
Rx buffer. Due to the trailing skb_shared_info in the skb->data,
alloc_skb() will do the next order allocation, which is 16K bytes. This
is suboptimal and more likely to fail when the system is under memory
usage pressure. Switching to paged Rx skb lets us allocate the RXB
directly by alloc_pages(), so that only order 1 allocation is required.

It also adjusts the area spin_lock (with IRQ disabled) protected in the
tasklet because tasklet guarentees to run only on one CPU and the new
unprotected code can be preempted by the IRQ handler. This saves us from
spawning another workqueue to make skb_linearize/__pskb_pull_tail happy
(which cannot be called in hard irq context).

Finally, mac80211 doesn't support paged Rx yet. So we linearize the skb
for all the management frames and software decryption or defragmentation
required data frames before handed to mac80211. For all the other frames,
we __pskb_pull_tail 64 bytes in the linear area of the skb for mac80211
to handle them properly.

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-10-27 16:48:06 -04:00
..
accessibility
acpi Merge branch 'acpi-pad' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2009-10-04 15:03:00 -07:00
amba Merge branches 'arm', 'at91', 'bcmring', 'ep93xx', 'mach-types', 'misc' and 'w90x900' into devel 2009-09-12 12:01:34 +01:00
ata trivial: fix comment typo in drivers/ata/pata_hpt37x.c 2009-09-21 15:15:53 +02:00
atm net: Make setsockopt() optlen be unsigned. 2009-09-30 16:12:20 -07:00
auxdisplay
base mm: oom analysis: add shmem vmstat 2009-09-22 07:17:27 -07:00
block Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2009-10-04 12:39:14 -07:00
bluetooth pcmcia: dtl1_cs: fix pcmcia_loop_config logic 2009-09-15 10:17:16 -07:00
cdrom sysctl: remove "struct file *" argument of ->proc_handler 2009-09-24 07:21:04 -07:00
char headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
clocksource
connector connector: Fix incompatible pointer type warning 2009-10-06 01:39:51 -07:00
cpufreq Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq 2009-09-18 09:16:57 -07:00
cpuidle cpuidle: menu governor: reduce latency on exit 2009-09-22 07:17:45 -07:00
crypto
dca dca: module load should not be an error message 2009-09-13 10:27:04 -07:00
dio
dma Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx into for-linus 2009-09-23 18:31:11 +10:00
edac edac: core: remove completion-wait for complete with rcu_barrier 2009-09-24 07:21:05 -07:00
eisa
firewire headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
firmware mm: don't use alloc_bootmem_low() where not strictly needed 2009-09-22 07:17:38 -07:00
gpio const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
gpu Merge branch 'drm-next' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2009-09-30 08:03:00 -07:00
hid headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
hwmon ltc4215/ltc4245: Discard obsolete detect methods 2009-10-04 22:53:42 +02:00
i2c i2c: Hide probe errors caused by ACPI resource conflicts 2009-10-04 22:53:45 +02:00
ide Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2009-09-23 09:32:11 -07:00
idle
ieee1394 const: mark struct vm_struct_operations 2009-09-27 11:39:25 -07:00
ieee802154
infiniband net: Convert ethtool {get_stats, self_test}_count() ops to get_sset_count() 2009-10-05 00:10:10 -07:00
input headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
isdn net: mark net_proto_ops as const 2009-10-07 01:10:46 -07:00
leds leds: leds-pca9532 - Drop unused module parameters 2009-10-04 22:53:43 +02:00
lguest const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
macintosh macintosh: Don't assume i2c device probing always succeeds 2009-10-04 22:53:46 +02:00
mca
md Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2009-10-04 12:39:14 -07:00
media headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
memstick memstick: move dev_dbg 2009-09-24 07:21:05 -07:00
message Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-09-22 07:51:45 -07:00
mfd headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
misc iwmc3200top: Add Intel Wireless MultiCom 3200 top driver. 2009-10-19 23:22:50 -07:00
mmc Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-10-02 16:20:43 -07:00
mtd block: use normal I/O path for discard requests 2009-10-01 21:19:30 +02:00
net iwlwifi: use paged Rx 2009-10-27 16:48:06 -04:00
nubus
of of: remove "stm,m25p40" alias 2009-09-23 07:39:43 -07:00
oprofile cpumask: use zalloc_cpumask_var() where possible 2009-09-24 09:34:24 +09:30
parisc mm: replace various uses of num_physpages by totalram_pages 2009-09-22 07:17:38 -07:00
parport sysctl: remove "struct file *" argument of ->proc_handler 2009-09-24 07:21:04 -07:00
pci ACPICA: fixup after acpi_get_object_info() change 2009-09-25 14:24:22 -04:00
pcmcia Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-10-02 16:20:43 -07:00
platform Merge branches 'sony-laptop', 'bugzilla-14247' and 'bugzilla-14271' into release 2009-10-02 11:27:57 -04:00
pnp ACPI: remove acpi_device.flags.hardware_id 2009-09-25 15:09:48 -04:00
power Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 2009-09-23 03:49:27 +04:00
pps
ps3 powerpc/ps3: Workaround for flash memory I/O error 2009-09-11 11:28:00 +10:00
rapidio
regulator regulator: fix voltage range in da9034 ldo12 2009-09-22 13:58:23 +01:00
rtc Merge branch 'origin' into for-linus 2009-09-24 21:22:33 +01:00
s390 ctcm rollback in case of errors 2009-10-17 23:57:24 -07:00
sbus const: make block_device_operations const 2009-09-22 07:17:25 -07:00
scsi const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
serial Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-10-06 22:43:16 -07:00
sfi SFI: remove __init from sfi_verify_table 2009-10-03 01:16:12 -04:00
sh
sn
spi spi-imx: strip down chipselect function to only drive the chipselect 2009-10-01 16:11:17 -07:00
ssb ssb: Put host pointers into a union 2009-10-27 16:47:55 -04:00
staging staging: Add proper selection of WIRELESS_EXT and WEXT_PRIV 2009-10-07 16:39:43 -04:00
tc
telephony
thermal thermal: add missing Kconfig dependency 2009-09-19 01:41:49 -04:00
uio const: mark struct vm_struct_operations 2009-09-27 11:39:25 -07:00
usb headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
uwb const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
video Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-10-02 13:37:18 -07:00
virtio virtio: add virtio IDs file 2009-09-23 22:26:32 +09:30
vlynq drivers/vlynq/vlynq.c: fix resource size off by 1 error 2009-09-24 07:21:05 -07:00
w1 ds2482: Discard obsolete detect method 2009-10-04 22:53:41 +02:00
watchdog [WATCHDOG] Add support for the Avionic Design Xanthos watchdog timer. 2009-09-25 08:38:16 +00:00
xen headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
zorro
Kconfig
Makefile Merge git://git.infradead.org/mtd-2.6 2009-09-23 10:07:49 -07:00