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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