Neil Horman 3b885787ea net: Generalize socket rx gap / receive queue overflow cmsg ... Create a new socket level option to report number of queue overflows Recently I augmented the AF_PACKET protocol to report the number of frames lost on the socket receive queue between any two enqueued frames. This value was exported via a SOL_PACKET level cmsg. AFter I completed that work it was requested that this feature be generalized so that any datagram oriented socket could make use of this option. As such I've created this patch, It creates a new SOL_SOCKET level option called SO_RXQ_OVFL, which when enabled exports a SOL_SOCKET level cmsg that reports the nubmer of times the sk_receive_queue overflowed between any two given frames. It also augments the AF_PACKET protocol to take advantage of this new feature (as it previously did not touch sk->sk_drops, which this patch uses to record the overflow count). Tested successfully by me. Notes: 1) Unlike my previous patch, this patch simply records the sk_drops value, which is not a number of drops between packets, but rather a total number of drops. Deltas must be computed in user space. 2) While this patch currently works with datagram oriented protocols, it will also be accepted by non-datagram oriented protocols. I'm not sure if thats agreeable to everyone, but my argument in favor of doing so is that, for those protocols which aren't applicable to this option, sk_drops will always be zero, and reporting no drops on a receive queue that isn't used for those non-participating protocols seems reasonable to me. This also saves us having to code in a per-protocol opt in mechanism. 3) This applies cleanly to net-next assuming that commit 977750076d (my af packet cmsg patch) is reverted Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2009-10-12 13:26:31 -07:00
..
hardware	Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/xscaleiop	2009-10-02 22:31:04 +01:00
mach	ARM: 5720/1: Move MMCI header to amba include dir	2009-09-22 20:49:04 +01:00
a.out-core.h
a.out.h	headers_check fix: arm, a.out.h	2009-02-01 11:01:22 +05:30
assembler.h	Merge branch 'for-rmk-2.6.32' of git://git.pengutronix.de/git/ukl/linux-2.6 into devel-stable	2009-08-15 16:51:48 +01:00
atomic.h	Clear the exclusive monitor when returning from an exception	2009-09-18 23:30:11 +01:00
auxvec.h
bitops.h	[ARM] 5339/1: fix __fls() on ARM	2008-12-04 09:21:55 +00:00
bitsperlong.h	asm-generic: introduce asm/bitsperlong.h	2009-06-11 21:02:14 +02:00
bug.h	[ARM] 5211/2: fix a couple warnings from BUG() usage	2008-09-01 12:06:27 +01:00
bugs.h
byteorder.h	byteorder: make swab.h include asm/swab.h like a regular header	2009-01-14 19:56:50 -08:00
cache.h	ARM: 5700/1: ARM: Introduce ARM_L1_CACHE_SHIFT to define cache line size	2009-09-15 22:06:38 +01:00
cacheflush.h	cpumask: use mm_cpumask() wrapper: arm	2009-09-24 09:34:49 +09:30
cachetype.h	[ARM] Introduce new bitmask based cache type macros	2008-09-25 15:35:28 +01:00
checksum.h
clkdev.h	[ARM] clkdev: add generic clkdev infrastructure	2008-11-27 12:38:21 +00:00
cpu-multi32.h
cpu-single.h
cpu.h
cputime.h
cputype.h	Merge branch 'devel' of git://git.kernel.org/pub/scm/linux/kernel/git/ycmiao/pxa-linux-2.6 into devel	2009-09-21 16:02:30 +01:00
current.h
delay.h
device.h	Driver Core: Add platform device arch data V3	2009-07-22 00:28:38 +02:00
div64.h	[ARM] 5320/1: fix assembly constraints in implementation of do_div()	2008-10-23 12:53:32 +01:00
dma-mapping.h	[ARM] make page_to_dma() highmem aware	2009-03-15 21:01:21 -04:00
dma.h	[ARM] dma: remove dmamode_t typedef	2009-01-02 12:34:55 +00:00
domain.h
ecard.h
elf.h	Thumb-2: Add support for loadable modules	2009-07-24 12:32:59 +01:00
emergency-restart.h
errno.h
fb.h
fcntl.h
fiq.h
fixmap.h	[ARM] fixmap support	2009-03-15 21:01:20 -04:00
flat.h	flat: fix data sections alignment	2009-05-29 08:40:02 -07:00
floppy.h	[ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach	2008-08-07 09:55:48 +01:00
fpstate.h
ftrace.h	Merge branch 'devel-stable' into devel	2009-09-12 12:02:26 +01:00
futex.h	Thumb-2: Implementation of the unified start-up and exceptions code	2009-07-24 12:32:54 +01:00
glue.h	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
gpio.h	[ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach	2008-08-07 09:55:48 +01:00
hardirq.h
highmem.h	[ARM] introduce dma_cache_maint_page()	2009-03-15 21:01:21 -04:00
hw_irq.h
hwcap.h	[ARM] 5388/1: Add hwcap bits for VFPv3 and VFPv3D16	2009-02-12 10:59:44 +00:00
ide.h
io.h	[ARM] Add a common typesafe __io implementation	2008-11-30 11:45:54 +00:00
ioctl.h
ioctls.h
ipcbuf.h
irq_regs.h
irq.h	[ARM] give RiscPC a NR_IRQS definition and remove default	2008-11-29 19:14:31 +00:00
irqflags.h
Kbuild	byteorder: make swab.h include asm/swab.h like a regular header	2009-01-14 19:56:50 -08:00
kdebug.h
kexec.h	kexec jump: rename KEXEC_CONTROL_CODE_SIZE to KEXEC_CONTROL_PAGE_SIZE	2008-08-15 08:35:42 -07:00
kgdb.h
kmap_types.h	[ARM] Feroceon: add highmem support to L2 cache handling code	2009-03-15 21:01:21 -04:00
kprobes.h	[ARM] 5206/1: remove kprobe_trap_handler() hack	2008-09-01 12:06:26 +01:00
leds.h
limits.h
linkage.h
local.h
localtimer.h	[ARM] smp: allow re-use of realview localtimer TWD support	2009-05-17 19:16:41 +01:00
locks.h
mc146818rtc.h	[ARM] Convert asm/io.h to linux/io.h	2008-09-06 12:10:45 +01:00
memory.h	Merge branch 'master' into devel	2009-09-12 12:04:37 +01:00
mman.h	mm: remove duplicate asm/mman.h files	2009-09-22 07:17:42 -07:00
mmu_context.h	cpumask: use mm_cpumask() wrapper: arm	2009-09-24 09:34:49 +09:30
mmu.h	NOMMU: Make VMAs per MM as for MMU-mode linux	2009-01-08 12:04:47 +00:00
mmzone.h	[ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach	2008-08-07 09:55:48 +01:00
module.h	[ARM] 5384/1: unwind: Add stack unwinding support for loadable modules	2009-02-19 11:27:19 +00:00
msgbuf.h
mtd-xip.h	[ARM] move asm/xip.h's mach/hardware.h include to mach/xip.h	2008-12-14 13:22:51 +00:00
mutex.h
nwflash.h
page-nommu.h	nommu: Remove the memory_start/end variables from ARM page-nommu.h	2009-07-24 12:35:01 +01:00
page.h	ARM: Fix pfn_valid() for sparse memory	2009-09-12 11:48:09 +01:00
param.h
parport.h
pci.h	PCI: remove pcibios_scan_all_fns()	2009-09-09 13:29:18 -07:00
percpu.h
pgalloc.h	ARM: implement highpte	2009-08-17 20:02:06 +01:00
pgtable-hwdef.h
pgtable-nommu.h
pgtable.h	ARM: implement highpte	2009-08-17 20:02:06 +01:00
poll.h
posix_types.h
proc-fns.h	Merge branch 'for-rmk' of git://gitorious.org/linux-gemini/mainline into devel	2009-03-26 23:10:11 +00:00
processor.h	Add core support for ARMv6/v7 big-endian	2009-05-30 14:00:18 +01:00
procinfo.h
ptrace.h	nommu: ptrace support	2009-07-24 12:34:58 +01:00
resource.h
scatterlist.h
sections.h
segment.h
sembuf.h
serial.h
setup.h	ARM: Fix broken highmem support	2009-08-15 12:36:00 +01:00
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h	asm-generic: rename termios.h, signal.h and mman.h	2009-06-11 21:01:52 +02:00
sizes.h	[ARM] Kirkwood: create a mapping for the Security Accelerator SRAM	2009-06-08 13:05:02 -04:00
smp_plat.h	ARM: Don't allow highmem on SMP platforms without h/w TLB ops broadcast	2009-09-28 18:06:20 +01:00
smp_scu.h	[ARM] smp: separate SCU support code from realview	2009-05-17 19:00:37 +01:00
smp_twd.h	[ARM] smp: allow re-use of realview localtimer TWD support	2009-05-17 19:16:41 +01:00
smp.h	cpumask: remove arch_send_call_function_ipi	2009-09-24 09:34:47 +09:30
socket.h	net: Generalize socket rx gap / receive queue overflow cmsg	2009-10-12 13:26:31 -07:00
sockios.h
sparsemem.h	[ARM] mm: enable sparsemem on clps7500 and RiscPC	2008-10-01 17:24:04 +01:00
spinlock_types.h
spinlock.h	Allow rwlocks to re-enable interrupts	2009-04-02 19:05:11 -07:00
stacktrace.h	[ARM] 5382/1: unwind: Reorganise the stacktrace support	2009-02-12 13:21:17 +00:00
stat.h
statfs.h	ARM: Use <asm-generic/statfs.h>	2008-09-04 09:46:11 +01:00
string.h	[ARM] remove memzero()	2008-11-27 12:37:59 +00:00
swab.h	headers_check fix: arm, swab.h	2009-02-01 11:01:23 +05:30
system.h	[ARM] Add cmpxchg support for ARMv6+ systems (v5)	2009-05-28 21:10:31 +01:00
tcm.h	ARM: 5580/2: ARM TCM (Tightly-Coupled Memory) support v3	2009-09-15 22:11:05 +01:00
termbits.h
termios.h
therm.h
thread_info.h	Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm	2009-09-14 17:48:14 -07:00
thread_notify.h
timex.h	[ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach	2008-08-07 09:55:48 +01:00
tlb.h	mm: Pass virtual address to [__]p{te,ud,md}_free_tlb()	2009-07-27 12:10:38 -07:00
tlbflush.h	cpumask: use mm_cpumask() wrapper: arm	2009-09-24 09:34:49 +09:30
topology.h
traps.h	[ARM] 5381/1: unwind: Reorganise the traps.c code	2009-02-12 13:21:15 +00:00
types.h
uaccess.h	Thumb-2: Implement the unified arch/arm/lib functions	2009-07-24 12:32:57 +01:00
ucontext.h
unaligned.h
unified.h	Fix "W" macro in arch/arm/include/asm/unified.h	2009-09-18 23:30:11 +01:00
unistd.h	ARM: Fix warning: #warning syscall migrate_pages not implemented	2009-09-28 18:06:19 +01:00
unwind.h	[ARM] 5383/2: unwind: Add core support for ARM stack unwinding	2009-02-19 11:26:24 +00:00
user.h	[ARM] 5387/1: Add ptrace VFP support on ARM	2009-02-12 10:59:43 +00:00
vfp.h
vfpmacros.h
vga.h	[ARM] Convert asm/io.h to linux/io.h	2008-09-06 12:10:45 +01:00
xor.h