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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
..
m32104ut m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
m32700ut m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
mappi2 m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
mappi3 m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
opsput m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
Kbuild m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
addrspace.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
assembler.h m32r: use __stringify() macro in assembler.h 2009-05-02 22:38:21 +09:00
atomic.h asm-generic: rename atomic.h to atomic-long.h 2009-06-11 21:02:17 +02:00
auxvec.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
bitops.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
bitsperlong.h asm-generic: introduce asm/bitsperlong.h 2009-06-11 21:02:14 +02:00
bug.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
bugs.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
byteorder.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
cache.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
cachectl.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
cacheflush.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
checksum.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
cputime.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
current.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
delay.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
device.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
div64.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
dma.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
elf.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
emergency-restart.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
errno.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
fb.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
fcntl.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
flat.h flat: fix data sections alignment 2009-05-29 08:40:02 -07:00
ftrace.h m32r: move include/asm-m32r/* to arch/m32r/include/asm/ 2009-04-17 10:50:23 +09:00
futex.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
hardirq.h m32r: convert to asm-generic/hardirq.h 2009-09-22 07:17:43 -07:00
hw_irq.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
io.h m32r: define ioread* and iowrite* macros 2009-10-04 12:02:36 +09:00
ioctl.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
ioctls.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
ipcbuf.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
irq.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
irq_regs.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
kdebug.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
kmap_types.h kmap_types: make most arches use generic header file 2009-06-16 19:47:51 -07:00
linkage.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
local.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
m32r.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
m32r_mp_fpga.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
m32102.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
mc146818rtc.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
mman.h mm: remove duplicate asm/mman.h files 2009-09-22 07:17:42 -07:00
mmu.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
mmu_context.h cpumask: use mm_cpumask() wrapper: m32r 2009-09-24 09:34:50 +09:30
mmzone.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
module.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
msgbuf.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
mutex.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
page.h m32r: make PAGE_SIZE available to assembly. 2009-09-23 00:29:38 +09:00
param.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
pci.h asm-generic: make pci.h usable directly 2009-06-11 21:02:22 +02:00
percpu.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
pgalloc.h mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
pgtable-2level.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
pgtable.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
poll.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
posix_types.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
processor.h m32r: Define THREAD_SIZE only once. 2009-09-23 00:29:38 +09:00
ptrace.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
resource.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
rtc.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
s1d13806.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
scatterlist.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
sections.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
segment.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
sembuf.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
serial.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
setup.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
shmbuf.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
shmparam.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
sigcontext.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
siginfo.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
signal.h asm-generic: rename termios.h, signal.h and mman.h 2009-06-11 21:01:52 +02:00
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 m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
spinlock.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
spinlock_types.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
stat.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
statfs.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
string.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
swab.h m32r: move include/asm-m32r/* to arch/m32r/include/asm/ 2009-04-17 10:50:23 +09:00
syscall.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
system.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
termbits.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
termios.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
thread_info.h m32r: Move GET_THREAD_INFO definition out of asm/thread_info.h. 2009-09-23 00:29:39 +09:00
timex.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
tlb.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
tlbflush.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
topology.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
types.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
uaccess.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
ucontext.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
unaligned.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
unistd.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
user.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
vga.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00
xor.h m32r: move include/asm-m32r headers to arch/m32r/include/asm 2009-04-17 10:05:01 +09:00