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Arnaldo Carvalho de Melo a2e2725541 net: Introduce recvmmsg socket syscall 
Meaning receive multiple messages, reducing the number of syscalls and
net stack entry/exit operations.

Next patches will introduce mechanisms where protocols that want to
optimize this operation will provide an unlocked_recvmsg operation.

This takes into account comments made by:

. Paul Moore: sock_recvmsg is called only for the first datagram,
  sock_recvmsg_nosec is used for the rest.

. Caitlin Bestler: recvmmsg now has a struct timespec timeout, that
  works in the same fashion as the ppoll one.

  If the underlying protocol returns a datagram with MSG_OOB set, this
  will make recvmmsg return right away with as many datagrams (+ the OOB
  one) it has received so far.

. Rémi Denis-Courmont & Steven Whitehouse: If we receive N < vlen
  datagrams and then recvmsg returns an error, recvmmsg will return
  the successfully received datagrams, store the error and return it
  in the next call.

This paves the way for a subsequent optimization, sk_prot->unlocked_recvmsg,
where we will be able to acquire the lock only at batch start and end, not at
every underlying recvmsg call.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-10-12 23:40:10 -07:00
..
boot kbuild: use INSTALLKERNEL to select customized installkernel script 2009-09-20 12:18:14 +02:00
common ARM: 5735/1: sa1111: CodingStyle cleanups 2009-10-02 22:32:33 +01:00
configs Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/xscaleiop 2009-10-02 22:31:04 +01:00
include/asm net: Generalize socket rx gap / receive queue overflow cmsg 2009-10-12 13:26:31 -07:00
kernel net: Introduce recvmmsg socket syscall 2009-10-12 23:40:10 -07:00
lib Merge branch 'for-rmk' of git://linux-arm.org/linux-2.6 2009-09-19 13:47:57 +01:00
mach-aaec2000
mach-at91 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-09-25 07:22:11 -07:00
mach-bcmring ARM: 5733/1: fix bcmring compile error 2009-10-01 16:26:16 +01:00
mach-clps711x
mach-davinci ARM: includecheck fix: mach-davinci, board-dm365-evm.c 2009-09-28 18:06:20 +01:00
mach-ebsa110
mach-ep93xx ep93xx video driver platform support 2009-09-23 07:39:51 -07:00
mach-footbridge
mach-gemini
mach-h720x
mach-integrator ARM: Fix section mismatch warning in Integrator pci_v3 2009-09-28 18:04:32 +01:00
mach-iop13xx Merge branch 'iop-raid6' into async-tx-next 2009-09-08 17:53:57 -07:00
mach-iop32x iop3xx: ATU and PCI memory configuration corrected 2009-08-18 13:48:35 -07:00
mach-iop33x iop3xx: ATU and PCI memory configuration corrected 2009-08-18 13:48:35 -07:00
mach-ixp4xx ixp4xx: arch_idle() documentation fixup 2009-09-21 19:20:03 +02:00
mach-ixp23xx
mach-ixp2000
mach-kirkwood Merge branch 'master' into devel 2009-09-12 12:04:37 +01:00
mach-ks8695 ARM: 5637/1: [KS8695] Don't reference CLOCK_TICK_RATE in drivers 2009-08-05 22:06:56 +01:00
mach-l7200
mach-lh7a40x
mach-loki
mach-mmp
mach-msm
mach-mv78xx0
mach-mx1 ARM: mxc: Fix i2c_board_info definitions 2009-08-14 12:40:37 +02:00
mach-mx2 mx21ads: Fix framebuffer platform data 2009-08-14 12:41:16 +02:00
mach-mx3 Merge branch 'master' into devel 2009-09-12 12:04:37 +01:00
mach-mx25 Freescale i.MX25 PDK (3ds) board support 2009-08-14 12:40:43 +02:00
mach-mxc91231 MXC: add iomux pins configuration support for MXC91231 2009-08-14 12:40:47 +02:00
mach-netx netx: Use get_irqnr_preamble to initialize base register 2009-08-13 20:34:36 +02:00
mach-nomadik mtd: OneNand support for Nomadik 8815 SoC (on NHK8815 board) 2009-09-20 06:00:27 -07:00
mach-ns9xxx const: constify remaining file_operations 2009-10-01 16:11:11 -07:00
mach-omap1 omap: Fix wrong jtag_id for 850 2009-09-24 16:23:13 -07:00
mach-omap2 omap: Fix wrong condition check in while loop for mailbox and iommu2 2009-09-28 09:21:26 -07:00
mach-orion5x [ARM] orion5x: Add LaCie NAS 2Big Network support 2009-09-08 14:10:35 -04:00
mach-pnx4008
mach-pxa Merge branch 'master' into for-linus 2009-09-22 21:01:40 +01:00
mach-realview ARM: 5720/1: Move MMCI header to amba include dir 2009-09-22 20:49:04 +01:00
mach-rpc
mach-s3c24a0/include/mach ARM: S3C: move s3c_device_nand from plat-s3c24xx to plat-s3c 2009-07-31 00:10:24 +01:00
mach-s3c2400
mach-s3c2410 ARM: S3C: Add missing selection of S3C_DEV_NAND in machine Kconfigs. 2009-09-17 10:12:28 +01:00
mach-s3c2412 ARM: S3C: Add missing selection of S3C_DEV_NAND in machine Kconfigs. 2009-09-17 10:12:28 +01:00
mach-s3c2440 ARM: S3C: Add missing selection of S3C_DEV_NAND in machine Kconfigs. 2009-09-17 10:12:28 +01:00
mach-s3c2442 [ARM] GTA02: build fixes (s3c2410_nand_set usage) 2009-06-24 00:10:46 +01:00
mach-s3c2443
mach-s3c6400 ARM: S3C: Add missing selection of S3C_DEV_NAND in machine Kconfigs. 2009-09-17 10:12:28 +01:00
mach-s3c6410 ARM: S3C: Add missing selection of S3C_DEV_NAND in machine Kconfigs. 2009-09-17 10:12:28 +01:00
mach-s5pc100 ARM: S5PC100: Board and configuration file 2009-08-16 23:40:39 +01:00
mach-sa1100 ARM: Remove unused CONFIG SA1100_H3XXX 2009-09-28 18:06:20 +01:00
mach-shark
mach-stmp37xx
mach-stmp378x
mach-u300 ARM: 5731/2: Fix U300 generic GPIO, remove ifdefs from MMCI v3 2009-10-01 16:26:15 +01:00
mach-versatile ARM: 5720/1: Move MMCI header to amba include dir 2009-09-22 20:49:04 +01:00
mach-w90x900 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2009-09-14 17:56:51 -07:00
mm ARM: 5728/1: Proper prefetch abort handling on ARMv6 and ARMv7 2009-10-02 22:34:32 +01:00
nwfpe
oprofile
plat-iop Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/xscaleiop 2009-10-02 22:31:04 +01:00
plat-mxc spi: add SPI driver for most known i.MX SoCs 2009-09-23 07:39:43 -07:00
plat-omap omap: Fix MMC gpio_wp for BeagleBoard C2 and above 2009-09-24 16:23:17 -07:00
plat-orion [ARM] Kirkwood: __init requires linux/init.h 2009-08-24 11:55:59 -04:00
plat-pxa [ARM] pxa/dma: add debugfs entries 2009-09-10 18:49:29 +08:00
plat-s3c ARM: s3c: fix check of index into s3c_gpios[] 2009-09-19 12:14:06 +01:00
plat-s3c24xx s3cmci: add better support for no card detect or write protect available 2009-10-01 16:11:15 -07:00
plat-s3c64xx Merge branch 'next-s3c-fixes' of git://aeryn.fluff.org.uk/bjdooks/linux 2009-09-18 20:55:56 +01:00
plat-s5pc1xx ARM: S5PC100: Kconfigs and Makefiles 2009-08-16 23:35:19 +01:00
plat-stmp3xxx ARM: STMP3xxx: deallocation with negative index of descriptors[] 2009-09-19 12:14:05 +01:00
tools [ARM] Update mach-types 2009-09-18 21:42:01 +01:00
vfp Thumb-2: Implement the unified VFP support 2009-07-24 12:32:57 +01:00
Kconfig ARM: 5580/2: ARM TCM (Tightly-Coupled Memory) support v3 2009-09-15 22:11:05 +01:00
Kconfig-nommu
Kconfig.debug Thumb-2: Add Thumb-2 support to the build files 2009-07-24 12:33:02 +01:00
Makefile Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-next 2009-09-23 15:37:02 -07:00