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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
..
Kbuild FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
atomic.h FRV: Implement atomic64_t 2009-07-01 19:38:09 -07:00
auxvec.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
ax88796.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
bitops.h FRV: bitops: Change the bitmap index from int to unsigned long 2009-06-11 09:01:26 -07:00
bitsperlong.h asm-generic: introduce asm/bitsperlong.h 2009-06-11 21:02:14 +02:00
bug.h FRV: Stop gcc from generating uninitialised variable warnings after BUG() 2009-04-27 08:04:49 -07:00
bugs.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
busctl-regs.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
byteorder.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
cache.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
cacheflush.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
checksum.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
cpu-irqs.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
cpumask.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
cputime.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
current.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
delay.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
device.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
div64.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
dm9000.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
dma-mapping.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
dma.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
elf.h FRV: Implement new-style ptrace 2009-06-11 09:01:26 -07:00
emergency-restart.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
errno.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
fb.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
fcntl.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
fpu.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
ftrace.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
futex.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
gdb-stub.h misc: remove redundant start_kernel prototypes 2009-09-23 10:05:22 -07:00
gpio-regs.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
hardirq.h FRV: Use asm/generic-hardirq.h 2009-09-23 10:15:21 -07:00
highmem.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
hw_irq.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
io.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
ioctl.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
ioctls.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
ipcbuf.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
irc-regs.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
irq.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
irq_regs.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
kdebug.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
kmap_types.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
linkage.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
local.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
math-emu.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
mb-regs.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
mb86943a.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
mb93091-fpga-irqs.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
mb93093-fpga-irqs.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
mb93493-irqs.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
mb93493-regs.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
mc146818rtc.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
mem-layout.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
mman.h mm: remove duplicate asm/mman.h files 2009-09-22 07:17:42 -07:00
mmu.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
mmu_context.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
module.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
msgbuf.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
mutex.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
page.h asm-generic: rename page.h and uaccess.h 2009-06-11 21:02:17 +02:00
param.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
pci.h asm-generic: merge branch 'master' of torvalds/linux-2.6 2009-06-12 11:32:58 +02:00
percpu.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
perf_event.h perf: Do the big rename: Performance Counters -> Performance Events 2009-09-21 14:28:04 +02:00
pgalloc.h mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
pgtable.h mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
poll.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
posix_types.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
processor.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
ptrace.h FRV: Implement new-style ptrace 2009-06-11 09:01:26 -07:00
registers.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
resource.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
scatterlist.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
sections.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
segment.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
sembuf.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
serial-regs.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
serial.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
setup.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
shmbuf.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
shmparam.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
sigcontext.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
siginfo.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
signal.h FRV: Fix interaction with new generic header stuff 2009-06-13 13:17:28 -07:00
smp.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
socket.h net: Generalize socket rx gap / receive queue overflow cmsg 2009-10-12 13:26:31 -07:00
sockios.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
spinlock.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
spr-regs.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
stat.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
statfs.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
string.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
suspend.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
swab.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
syscall.h FRV: Implement new-style ptrace 2009-06-11 09:01:26 -07:00
system.h FRV: Implement atomic64_t 2009-07-01 19:38:09 -07:00
termbits.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
termios.h asm-generic: rename termios.h, signal.h and mman.h 2009-06-11 21:01:52 +02:00
thread_info.h sched: INIT_PREEMPT_COUNT 2009-07-10 14:24:05 -07:00
timer-regs.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
timex.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
tlb.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
tlbflush.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
topology.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
types.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
uaccess.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
ucontext.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
unaligned.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
unistd.h perf: Do the big rename: Performance Counters -> Performance Events 2009-09-21 14:28:04 +02:00
user.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
vga.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
virtconvert.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00
xor.h FRV: Move to arch/frv/include/asm/ 2009-04-10 01:48:06 +01:00