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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
..
native ia64/pv_ops: paravirtualize gate.S. 2009-03-26 11:01:46 -07:00
sn [IA64] Convert ia64 to use int-ll64.h 2009-06-17 09:33:49 -07:00
uv sgi-gru: add macros for using the UV hub to send interrupts 2009-04-02 19:05:05 -07:00
xen Fix ia64 compilation IS_ERR and PTE_ERR errors. 2009-07-17 06:34:50 -07:00
acpi-ext.h ACPI: remove private acpica headers from driver files 2008-12-31 01:15:22 -05:00
acpi.h ACPI: IA64=y ACPI=n build fix 2009-09-27 04:17:21 -04:00
agp.h agp: kill phys_to_gart() and gart_to_phys() 2009-08-03 09:05:00 +01:00
asmmacro.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
atomic.h asm-generic: rename atomic.h to atomic-long.h 2009-06-11 21:02:17 +02:00
auxvec.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
bitops.h ia64: boolean __test_and_clear_bit 2009-08-11 14:52:10 -07:00
bitsperlong.h asm-generic: introduce asm/bitsperlong.h 2009-06-11 21:02:14 +02:00
break.h ia64/xen: reserve "break" numbers used for xen hypercalls. 2008-10-17 09:52:52 -07:00
bug.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
bugs.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
byteorder.h byteorder: make swab.h include asm/swab.h like a regular header 2009-01-14 19:56:50 -08:00
cache.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
cacheflush.h [IA64] Add Variable Page Size and IA64 Support in Intel IOMMU 2008-10-17 12:14:13 -07:00
checksum.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
compat.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
cpu.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
cputime.h cputime: Optimize jiffies_to_cputime(1) 2009-08-03 14:48:36 +02:00
current.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
cyclone.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
delay.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
device.h Driver Core: Add platform device arch data V3 2009-07-22 00:28:38 +02:00
div64.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
dma-mapping.h IA64: Remove NULL flush_write_buffers 2009-08-10 09:34:58 +02:00
dma.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
dmi.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
elf.h [PATCH] remove unused ibcs2/PER_SVR4 in SET_PERSONALITY 2008-10-16 15:40:05 +02:00
emergency-restart.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
errno.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
esi.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
fb.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
fcntl.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
fpswa.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
fpu.h Revert "Neither asm/types.h nor linux/types.h is required for arch/ia64/include/asm/fpu.h" 2009-07-17 06:35:05 -07:00
ftrace.h ftrace, ia64: IA64 dynamic ftrace support 2009-01-14 12:11:31 +01:00
futex.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
gcc_intrin.h [IA64] Convert ia64 to use int-ll64.h 2009-06-17 09:33:49 -07:00
hardirq.h preempt-count: force hardirq-count to max of 10 2009-02-12 11:19:05 -05:00
hpsim.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
hugetlb.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
hw_irq.h [IA64] remove obsolete hw_interrupt_type 2009-06-15 14:35:10 -07:00
ia32.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
ia64regs.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
idle.h [IA64] xen_domu_defconfig: fix build issues/warnings 2009-05-05 11:43:13 -07:00
intel_intrin.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
intrinsics.h Pull pvops into release branch 2009-03-31 14:25:08 -07:00
io.h [IA64] remove dead BIO_VMERGE_BOUNDARY definition 2008-11-04 11:31:58 -08:00
ioctl.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
ioctls.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
iommu.h intel-iommu: Fix one last ia64 build problem in Pass Through Support 2009-06-05 20:49:53 +01:00
iosapic.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
ipcbuf.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
irq.h ia64: cpumask fix for is_affinity_mask_valid() 2009-01-04 15:39:24 +01:00
irq_regs.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
Kbuild [IA64] unexport fpswa.h 2009-06-15 14:32:54 -07:00
kdebug.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
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 [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
kregs.h [IA64] Fix annoying IA64_TR_ALLOC_MAX message. 2008-10-17 13:47:53 -07:00
kvm.h Merge branch 'header-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-03-26 16:11:41 -07:00
kvm_host.h KVM: Prepare memslot data structures for multiple hugepage sizes 2009-09-10 08:33:02 +03:00
kvm_para.h KVM: Add __KERNEL__ guards to exported headers 2009-09-10 10:46:48 +03:00
libata-portmap.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
linkage.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
local.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
machvec.h Merge branch 'linus' into core/iommu 2009-01-16 10:09:10 +01:00
machvec_dig.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
machvec_dig_vtd.h remove dma operations in struct ia64_machine_vector 2009-01-06 14:06:50 +01:00
machvec_hpsim.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
machvec_hpzx1.h remove dma operations in struct ia64_machine_vector 2009-01-06 14:06:50 +01:00
machvec_hpzx1_swiotlb.h remove hwsw_dma_ops 2009-01-06 14:06:52 +01:00
machvec_init.h [IA64] SN specific version of dma_get_required_mask() 2009-01-15 10:42:16 -08:00
machvec_sn2.h Merge branch 'linus' into core/iommu 2009-01-16 10:09:10 +01:00
machvec_uv.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
machvec_xen.h ia64/xen: define xen machine vector for domU. 2008-10-17 10:08:56 -07:00
mc146818rtc.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
mca.h [IA64] kexec: Make INIT safe while transition to 2009-09-14 16:18:02 -07:00
mca_asm.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
meminit.h [IA64] Convert ia64 to use int-ll64.h 2009-06-17 09:33:49 -07:00
mman.h mm: remove duplicate asm/mman.h files 2009-09-22 07:17:42 -07:00
mmu.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
mmu_context.h cpumask: use mm_cpumask() wrapper: ia64 2009-03-16 14:12:48 +10:30
mmzone.h mm: clean up for early_pfn_to_nid() 2009-02-18 15:37:55 -08:00
module.h ia64/pv_ops/bp/module: support binary patching for kernel module. 2009-03-26 11:02:51 -07:00
msgbuf.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
msidef.h ia64: Move the macro definitions related to MSI to one header file. 2009-03-24 11:03:12 +02:00
mutex.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
nodedata.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
numa.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
page.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
pal.h [IA64] Convert ia64 to use int-ll64.h 2009-06-17 09:33:49 -07:00
param.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
paravirt.h ia64/pv_ops: implement binary patching optimization for native. 2009-03-26 11:02:42 -07:00
paravirt_patch.h ia64/pv_op/binarypatch: add helper functions to support binary patching for paravirt_ops. 2009-03-26 11:02:31 -07:00
paravirt_privop.h [IA64] fix allmodconfig compilation breakage. 2009-04-20 09:46:29 -07:00
parport.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
patch.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
pci.h PCI: remove pcibios_scan_all_fns() 2009-09-09 13:29:18 -07:00
percpu.h percpu: make PER_CPU_BASE_SECTION overridable by arches 2009-02-09 10:30:29 +01:00
perfmon.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
perfmon_default_smpl.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
pgalloc.h mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
pgtable.h IA64: includecheck fix: ia64, pgtable.h 2009-08-11 14:52:11 -07:00
poll.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
posix_types.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
processor.h [IA64] Convert ia64 to use int-ll64.h 2009-06-17 09:33:49 -07:00
ptrace.h remove __ARCH_WANT_COMPAT_SYS_PTRACE 2008-11-30 11:00:15 -08:00
ptrace_offsets.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
pvclock-abi.h ia64/xen: add a necessary header file to compile include/xen/interface/xen.h 2008-10-17 09:57:28 -07:00
resource.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
rse.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
rwsem.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
sal.h [IA64] Convert ia64 to use int-ll64.h 2009-06-17 09:33:49 -07:00
scatterlist.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
sections.h [IA64] Put the space for cpu0 per-cpu area into .data section 2008-09-29 16:39:19 -07:00
segment.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
sembuf.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
serial.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
setup.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
shmbuf.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
shmparam.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
sigcontext.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
siginfo.h signals: demultiplexing SIGTRAP signal 2008-09-23 13:26:52 +02:00
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 [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
sparsemem.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
spinlock.h [IA64] implement ticket locks for Itanium 2009-09-25 08:42:16 -07:00
spinlock_types.h [IA64] implement ticket locks for Itanium 2009-09-25 08:42:16 -07:00
stat.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
statfs.h IA64: Use <asm-generic/statfs.h> 2008-09-04 09:46:13 +01:00
string.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
swab.h headers_check fix: ia64, swab.h 2009-02-01 11:01:25 +05:30
swiotlb.h swiotlb: replace architecture-specific swiotlb.h with linux/swiotlb.h 2008-12-28 10:04:00 +01:00
sync_bitops.h ia64/xen: introduce sync bitops which is necessary for ia64/xen support. 2008-10-17 09:53:33 -07:00
syscall.h [IA64] utrace Convert compat ptrace to use compat_sys_ptrace 2008-10-06 10:45:29 -07:00
system.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
termbits.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
termios.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
thread_info.h sched: INIT_PREEMPT_COUNT 2009-07-10 14:24:05 -07:00
timex.h ia64/pv_ops/pv_time_ops: add sched_clock hook. 2009-03-26 10:50:42 -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 [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
topology.h cpumask: remove obsolete topology_core_siblings and topology_thread_siblings: ia64 2009-09-24 09:34:43 +09:30
types.h [IA64] Convert ia64 to use int-ll64.h 2009-06-17 09:33:49 -07:00
uaccess.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
ucontext.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
unaligned.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
uncached.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
unistd.h [IA64] ia64 does not need umount2() syscall 2009-06-16 13:13:50 -07:00
unwind.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
user.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
ustack.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
vga.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00
xor.h [IA64] Move include/asm-ia64 to arch/ia64/include/asm 2008-08-01 10:21:21 -07:00