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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 byteorder: make swab.h include asm/swab.h like a regular header 2009-01-14 19:56:50 -08:00
airq.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
appldata.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
atomic.h [S390] atomic ops: small cleanups 2009-09-11 10:29:44 +02:00
auxvec.h [S390] introduce vdso on s390 2008-12-25 13:38:55 +01:00
bitops.h [S390] bitops: remove likely annotations 2009-03-26 15:24:23 +01:00
bitsperlong.h asm-generic: introduce asm/bitsperlong.h 2009-06-11 21:02:14 +02:00
bug.h [S390] remove warnings with functions ending in BUG 2008-12-25 13:39:12 +01:00
bugs.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
byteorder.h byteorder: make swab.h include asm/swab.h like a regular header 2009-01-14 19:56:50 -08:00
cache.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
cacheflush.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
ccwdev.h [S390] cio: force console function 2009-06-16 10:31:11 +02:00
ccwgroup.h [S390] pm: ccwgroup bus power management callbacks 2009-06-16 10:31:08 +02:00
checksum.h [S390] convert/optimize csum_fold() to C 2009-09-11 10:29:43 +02:00
chpid.h [S390] types: add/fix types.h include in header files 2009-01-09 12:15:06 +01:00
chsc.h [S390] cio: move scsw helper functions to header file 2009-09-11 10:29:36 +02:00
cio.h [S390] cio: move scsw helper functions to header file 2009-09-11 10:29:36 +02:00
cmb.h [S390] types: add/fix types.h include in header files 2009-01-09 12:15:06 +01:00
compat.h [S390] implement is_compat_task 2009-06-12 10:27:30 +02:00
cpcmd.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
cpu.h [S390] Get rid of cpuid.h header file. 2009-09-11 10:29:56 +02:00
cputime.h cputime: Optimize jiffies_to_cputime(1) 2009-08-03 14:48:36 +02:00
crw.h [S390] split/move machine check handler code 2009-03-26 15:24:10 +01:00
current.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
dasd.h [S390] dasd: add large volume support 2009-03-26 15:24:05 +01:00
debug.h [S390] s390dbf: Add description for usage of "%s" in sprintf events 2009-09-11 10:29:53 +02:00
delay.h [S390] Move private simple udelay function to arch/s390/lib/delay.c. 2008-10-10 21:33:58 +02:00
device.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
diag.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
div64.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
dma.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
ebcdic.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
elf.h [S390] personality: fix personality loss on execve 2009-01-23 16:40:28 +01:00
emergency-restart.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
errno.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
etr.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
extmem.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
fb.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
fcntl.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
fcx.h [S390] cio: update sac values 2008-12-25 13:39:06 +01:00
ftrace.h [S390] ftrace: add function graph tracer support 2009-06-12 10:27:39 +02:00
futex.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
hardirq.h [S390] remove unused irq_cpustat_t defintion 2009-09-11 10:29:48 +02:00
hugetlb.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
idals.h [S390] dasd: add High Performance FICON support 2009-03-26 15:24:05 +01:00
io.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
ioctl.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
ioctls.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
ipcbuf.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
ipl.h [S390] kernel: Append scpdata to kernel boot command line 2009-09-11 10:29:46 +02:00
irq.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
irq_regs.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
irqflags.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
isc.h [S390] zcrypt: Use of Thin Interrupts 2008-12-25 13:38:57 +01:00
itcw.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
kdebug.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
kexec.h kexec jump: rename KEXEC_CONTROL_CODE_SIZE to KEXEC_CONTROL_PAGE_SIZE 2008-08-15 08:35:42 -07:00
kmap_types.h kmap_types: make most arches use generic header file 2009-06-16 19:47:51 -07:00
kprobes.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
kvm.h KVM: s390: remove unused structs 2009-09-10 08:33:15 +03:00
kvm_host.h Merge branch 'kvm-updates/2.6.32' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2009-09-14 17:43:43 -07:00
kvm_para.h KVM: Add __KERNEL__ guards to exported headers 2009-09-10 10:46:48 +03:00
kvm_virtio.h [S390] kvm: use console_initcall() to initialize s390 virtio console 2009-09-11 10:29:52 +02:00
linkage.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
local.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
lowcore.h [S390] hibernate: Do real CPU swap at resume time 2009-09-22 22:58:46 +02:00
mathemu.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
mman.h mm: remove duplicate asm/mman.h files 2009-09-22 07:17:42 -07:00
mmu.h [S390] fix recursive locking on page_table_lock 2009-09-11 10:29:53 +02:00
mmu_context.h [S390] cpumask: use mm_cpumask() wrapper 2009-03-26 15:24:34 +01:00
module.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
monwriter.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
msgbuf.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
mutex.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
nmi.h [S390] split/move machine check handler code 2009-03-26 15:24:10 +01:00
page.h [S390] Enable guest page hinting by default. 2009-09-11 10:29:54 +02:00
param.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
pci.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
percpu.h s390: switch to dynamic percpu allocator 2009-06-24 15:13:53 +09:00
perf_event.h perf: Do the big rename: Performance Counters -> Performance Events 2009-09-21 14:28:04 +02:00
pgalloc.h [S390] fix recursive locking on page_table_lock 2009-09-11 10:29:53 +02:00
pgtable.h [S390] vmalloc: add vmalloc kernel parameter support 2009-06-12 10:27:33 +02:00
poll.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
posix_types.h [S390] asm-s390/posix_types.h: drop __USE_ALL usage 2009-01-09 12:15:04 +01:00
processor.h [S390] fix disabled_wait inline assembly clobber list 2009-09-22 22:58:45 +02:00
ptrace.h [S390] s390: move machine flags to lowcore 2009-04-14 15:37:21 +02:00
qdio.h [S390] qdio: Sanitize do_QDIO sanity checks 2009-06-22 12:08:21 +02:00
qeth.h [S390] types: add/fix types.h include in header files 2009-01-09 12:15:06 +01:00
reset.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
resource.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
rwsem.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
s390_ext.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
scatterlist.h [S390] use generic scatterlist.h 2009-09-11 10:29:54 +02:00
schid.h [S390] types: add/fix types.h include in header files 2009-01-09 12:15:06 +01:00
sclp.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
scsw.h [S390] cio: move scsw helper functions to header file 2009-09-11 10:29:36 +02:00
seccomp.h [S390] secure computing arch backend 2009-06-12 10:27:31 +02:00
sections.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
segment.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
sembuf.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
setup.h [S390] kernel: Append scpdata to kernel boot command line 2009-09-11 10:29:46 +02:00
sfp-machine.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
sfp-util.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
shmbuf.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
shmparam.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
sigcontext.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
siginfo.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
signal.h asm-generic: rename termios.h, signal.h and mman.h 2009-06-11 21:01:52 +02:00
sigp.h [S390] convert s390 to generic IPI infrastructure 2008-12-25 13:38:56 +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 [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
sparsemem.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
spinlock.h locking: Inline spinlock code for all locking variants on s390 2009-08-31 18:08:51 +02:00
spinlock_types.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
stat.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
statfs.h S390: Update comments about why we don't use <asm-generic/statfs.h> 2008-09-06 19:30:19 +01:00
string.h [S390] use compiler builtin versions of strlen/strcpy/strcat 2009-03-26 15:24:24 +01:00
suspend.h [S390] s390: hibernation support for s390 2009-06-16 10:31:22 +02:00
swab.h [S390] types: add/fix types.h include in header files 2009-01-09 12:15:06 +01:00
syscall.h [S390] ftrace: add system call tracer support 2009-06-12 10:27:39 +02:00
sysinfo.h [S390] Fix hypervisor detection for KVM 2009-03-26 15:24:09 +01:00
system.h [S390] Enable guest page hinting by default. 2009-09-11 10:29:54 +02:00
tape390.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
termbits.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
termios.h asm-generic: rename termios.h, signal.h and mman.h 2009-06-11 21:01:52 +02:00
thread_info.h tracing: Rename FTRACE_SYSCALLS for tracepoints 2009-08-26 00:17:35 +02:00
timer.h [S390] extend virtual timer interface by mod_virt_timer_periodic 2009-04-14 15:37:23 +02:00
timex.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2009-09-14 17:53:36 -07:00
tlb.h mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
tlbflush.h [S390] cpumask: use mm_cpumask() wrapper 2009-03-26 15:24:34 +01:00
todclk.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
topology.h cpumask: remove obsolete topology_core_siblings and topology_thread_siblings: s390 2009-09-24 09:34:42 +09:30
types.h asm-generic: introduce asm/bitsperlong.h 2009-06-11 21:02:14 +02:00
uaccess.h [S390] uaccess: use might_fault() instead of might_sleep() 2009-06-12 10:27:33 +02:00
ucontext.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
unaligned.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
unistd.h perf: Do the big rename: Performance Counters -> Performance Events 2009-09-21 14:28:04 +02:00
user.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
vdso.h [PATCH] fast vdso implementation for CLOCK_THREAD_CPUTIME_ID 2008-12-31 15:11:49 +01:00
vtoc.h [S390] dasd: add large volume support 2009-03-26 15:24:05 +01:00
xor.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00
zcrypt.h [S390] move include/asm-s390 to arch/s390/include/asm 2008-08-01 20:42:05 +02:00