Poll() returns immediately after setting the kernel current frame
(ring->head) to SKIP from user space even though there is no new
frame. And in a case of all frames is VALID, user space program
unintensionally sets (only) kernel current frame to UNUSED, then
calls poll(), it will not return immediately even though there are
VALID frames.

To avoid situations like above, I think we need to scan all frames
to find VALID frames at poll() like netlink_alloc_skb(),
netlink_forward_ring() finding an UNUSED frame at skb allocation.
Signed-off-by: Ken-ichirou MATSUZAWA <chamas@h4.dion.ne.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

Aleksey Makarov says:

====================
net: thunderx: New features and fixes

v2:
  - The unused affinity_mask field of the structure cmp_queue
  has been deleted. (thanks to David Miller)
  - The unneeded initializers have been dropped. (thanks to Alexey Klimov)
  - The commit message "net: thunderx: Rework interrupt handling"
  has been fixed. (thanks to Alexey Klimov)
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Support for setting VF's corresponding BGX LMAC in internal
loopback mode. This mode can be used for verifying basic HW
functionality such as packet I/O, RX checksum validation,
CQ/RBDR interrupts, stats e.t.c. Useful when DUT has no external
network connectivity.

'loopback' mode can be enabled or disabled via ethtool.

Note: This feature is not supported when no of VFs enabled are
morethan no of physical interfaces i.e active BGX LMACs
Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch adds support for handling multiple qsets assigned to a
single VF. There by increasing no of queues from earlier 8 to max
no of CPUs in the system i.e 48 queues on a single node and 96 on
dual node system. User doesn't have option to assign which Qsets/VFs
 to be merged. Upon request from VF, PF assigns next free Qsets as
secondary qsets. To maintain current behavior no of queues is kept
to 8 by default which can be increased via ethtool.

If user wants to unbind NICVF driver from a secondary Qset then it
should be done after tearing down primary VF's interface.
Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@caviumnetworks.com>
Signed-off-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Rework interrupt handler to avoid checking IRQ affinity of
CQ interrupts. Now separate handlers are registered for each IRQ
including RBDR. Register interrupt handlers for only those
which are being used. Add nicvf_dump_intr_status() and use it
in irq handlers.
Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch configures HW to strip 802.1Q header if found in a
receiving packet. The stripped VLAN ID and TCI information is
passed on to software via CQE_RX. Also sets netdev's 'vlan_features'
so that other HW offload features can be used for tagged packets.

This offload feature can be enabled or disabled via ethtool.

Network stack normally ignores RPS for 802.1Q packets and hence low
throughput. With this offload enabled throughput for tagged packets
will be almost same as normal packets.

Note: This patch doesn't enable HW VLAN insertion for transmit packets.
Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Adding support for receive hashing HW offload by using RSS_ALG
and RSS_TAG fields of CQE_RX descriptor. Also removed dependency
on minimum receive queue count to configure RSS so that hash is
always generated.

This hash is used by RPS logic to distribute flows across multiple
CPUs. Offload can be disabled via ethtool.
Signed-off-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use the nicvf_send_msg_to_pf() function in the mailbox code.
Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Added ethtool support to dump receive packet error statistics reported
in CQE. Also made some small fixes
Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The liquidio and thunder drivers have different maintainers.
Signed-off-by: Aleksey Makarov <aleksey.makarov@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Raghavendra K T says:

====================
Optimize the snmp stat aggregation for large cpus

While creating 1000 containers, perf is showing lot of time spent in
snmp_fold_field on a large cpu system.

The current patch tries to improve by reordering the statistics gathering.

Please note that similar overhead was also reported while creating
veth pairs  https://lkml.org/lkml/2013/3/19/556

Changes in V4:
 - remove 'item' variable and use IPSTATS_MIB_MAX to avoid sparse
   warning (Eric) also remove 'item' parameter (Joe)
 - add missing memset of padding.

Changes in V3:
 - use memset to initialize temp buffer in leaf function. (David)
 - use memcpy to copy the buffer data to stat instead of unalign_pu (Joe)
 - Move buffer definition to leaf function __snmp6_fill_stats64() (Eric)
 -
Changes in V2:
 - Allocate the stat calculation buffer in stack. (Eric)

Setup:
160 cpu (20 core) baremetal powerpc system with 1TB memory

1000 docker containers was created with command
docker run -itd  ubuntu:15.04  /bin/bash in loop

observation:
Docker container creation linearly increased from around 1.6 sec to 7.5 sec
(at 1000 containers) perf data showed, creating veth interfaces resulting in
the below code path was taking more time.

rtnl_fill_ifinfo
  -> inet6_fill_link_af
    -> inet6_fill_ifla6_attrs
      -> snmp_fold_field

proposed idea:
 currently __snmp6_fill_stats64 calls snmp_fold_field that walks
through per cpu data to of an item (iteratively for around 36 items).
 The patch tries to aggregate the statistics by going through
all the items of each cpu sequentially which is reducing cache
misses.

Performance of docker creation improved by around more than 2x
after the patch.

before the patch:
================
3f45ba571a42e925c4ec4aaee0e48d7610a9ed82a4c931f83324d41822cf6617
real	0m6.836s
user	0m0.095s
sys	0m0.011s

perf record -a docker run -itd  ubuntu:15.04  /bin/bash
=======================================================
    50.73%  docker           [kernel.kallsyms]       [k] snmp_fold_field
     9.07%  swapper          [kernel.kallsyms]       [k] snooze_loop
     3.49%  docker           [kernel.kallsyms]       [k] veth_stats_one
     2.85%  swapper          [kernel.kallsyms]       [k] _raw_spin_lock
     1.37%  docker           docker                  [.] backtrace_qsort
     1.31%  docker           docker                  [.] strings.FieldsFunc

  cache-misses:  2.7%

after the patch:
=============
9178273e9df399c8290b6c196e4aef9273be2876225f63b14a60cf97eacfafb5
real	0m3.249s
user	0m0.088s
sys	0m0.020s

perf record -a docker run -itd  ubuntu:15.04  /bin/bash
=======================================================
    10.57%  docker           docker                [.] scanblock
     8.37%  swapper          [kernel.kallsyms]     [k] snooze_loop
     6.91%  docker           [kernel.kallsyms]     [k] snmp_get_cpu_field
     6.67%  docker           [kernel.kallsyms]     [k] veth_stats_one
     3.96%  docker           docker                [.] runtime_MSpan_Sweep
     2.47%  docker           docker                [.] strings.FieldsFunc

cache-misses: 1.41 %

Please let me know if you have suggestions/comments.
Thanks Eric, Joe and David for the comments.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Docker container creation linearly increased from around 1.6 sec to 7.5 sec
(at 1000 containers) and perf data showed 50% ovehead in snmp_fold_field.

reason: currently __snmp6_fill_stats64 calls snmp_fold_field that walks
through per cpu data of an item (iteratively for around 36 items).

idea: This patch tries to aggregate the statistics by going through
all the items of each cpu sequentially which is reducing cache
misses.

Docker creation got faster by more than 2x after the patch.

Result:
                       Before           After
Docker creation time   6.836s           3.25s
cache miss             2.7%             1.41%

perf before:
    50.73%  docker           [kernel.kallsyms]       [k] snmp_fold_field
     9.07%  swapper          [kernel.kallsyms]       [k] snooze_loop
     3.49%  docker           [kernel.kallsyms]       [k] veth_stats_one
     2.85%  swapper          [kernel.kallsyms]       [k] _raw_spin_lock

perf after:
    10.57%  docker           docker                [.] scanblock
     8.37%  swapper          [kernel.kallsyms]     [k] snooze_loop
     6.91%  docker           [kernel.kallsyms]     [k] snmp_get_cpu_field
     6.67%  docker           [kernel.kallsyms]     [k] veth_stats_one

changes/ideas suggested:
Using buffer in stack (Eric), Usage of memset (David), Using memcpy in
place of unaligned_put (Joe).
Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pravin B Shelar says:

====================
openvswitch: Cleanup post vport conversion.

After converting all vport to netdev implmentations there
is no need for some of vport functionality.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

This structure is not used anymore.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Since all vport types are now backed by netdev, we can directly
use netdev stats. Following patch removes redundant stat
from vport.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tun info is passed using skb-dst pointer. Now we have
converted all vports to netdev based implementation so
Now we can remove redundant pointer to tun-info from OVS_CB.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Remove unused get_name() function pointer from vport ops.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Geneve can benefit from GRO at the device level in a manner similar
to other tunnels, especially as hardware offloads are still emerging.

After this patch, aggregated frames are seen on the tunnel interface.
Single stream throughput nearly doubles in ideal circumstances (on
old hardware).
Signed-off-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

When an error occurs skipping IPv6 extension headers retain the already
parsed IP protocol and IPv6 addresses in the flow. Also assume that the
packet is not a fragment in the absence of information to the contrary;
that is always use the frag_off value set by ipv6_skip_exthdr().

This allows matching on the IP protocol and IPv6 addresses of packets
with malformed extension headers.
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next

Johan Hedberg says:

====================
pull request: bluetooth-next 2015-08-28

One more bunch of Bluetooth patches for 4.3:

 - Crash fix for hci_bcm driver
 - Enhancements to hci_intel driver (e.g. baudrate configuration)
 - Fix for SCO link type after multiple connect attempts
 - Cleanups & minor fixes in a few other places

Please let me know if there are any issues pulling. Thanks.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

The interrupt handler may not be available when smsc911x probes if the
interrupt handler is a GPIO controller for example. Let's fix that
by adding handling for -EPROBE_DEFER.

Cc: Steve Glendinning <steve.glendinning@shawell.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Jiri Benc says:

====================
tunnels: fix incorrect IPv4/v6 headers interpretation

With tunneling, it is currently possible to get an IPv6 header and interpret
it as an IPv4 header, or to interpret an IPv6 address as an IPv4 address
(and vice versa). This leads to things like sending packets to incorrect
address, IPv6 flow label being interpreted as IP packet length, etc.

Fix several places where this can happen.

Most of this is net-next only. The third patch affects net, too, but it
doesn't seem there's anything in user space that sets the attribute at all
currently, thus net-next is fine.

Changelog:
v2: fixed geneve after incorrect rebase on top of Pravin's patches
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

By default (subject to the sysctl settings), IPv6 sockets listen also for
IPv4 traffic. Vxlan is not prepared for that and expects IPv6 header in
packets received through an IPv6 socket.

In addition, it's currently not possible to have both IPv4 and IPv6 vxlan
tunnel on the same port (unless bindv6only sysctl is enabled), as it's not
possible to create and bind both IPv4 and IPv6 vxlan interfaces and there's
no way to specify both IPv4 and IPv6 remote/group IP addresses.

Set IPV6_V6ONLY on vxlan sockets to fix both of these issues. This is not
done globally in udp_tunnel, as l2tp and tipc seems to work okay when
receiving IPv4 packets on IPv6 socket and people may rely on this behavior.
The other tunnels (geneve and fou) do not support IPv6.
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

fou does not really support IPv6 encapsulation. After an UDP socket is
created in fou_create, the encap_rcv callback is set either to fou_udp_recv
or to gue_udp_recv. Both of those unconditionally assume that the received
packet has an IPv4 header and access the data at network_header as it was an
IPv4 header. This leads to IPv6 flow label being interpreted as IP packet
length, etc.

Disallow fou tunnel to be configured as IPv6 until real IPv6 support is
added to fou.

CC: Tom Herbert <tom@herbertland.com>
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

There's currently nothing preventing directing packets with IPv6
encapsulation data to IPv4 tunnels (and vice versa). If this happens,
IPv6 addresses are incorrectly interpreted as IPv4 ones.

Track whether the given ip_tunnel_key contains IPv4 or IPv6 data. Store this
in ip_tunnel_info. Reject packets at appropriate places if they are supposed
to be encapsulated into an incompatible protocol.
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The mode field holds a single bit of information only (whether the
ip_tunnel_info struct is for rx or tx). Change the mode field to bit flags.
This allows more mode flags to be added.
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

A few useful tracepoints developing VRF driver.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

When removing an non-primary transport during ASCONF
processing, we end up traversing the transport list
twice: once in sctp_cmd_del_non_primary, and once in
sctp_assoc_del_peer.  We can avoid the second
search and call sctp_assoc_rm_peer() instead.
Found by code inspection during code reviews.
Signed-off-by: Vladislav Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The problem is rcu_read_unlock_bh() which triggers a warning when irqs are
disabled. ndo_poll_controller should run with irqs disabled always so we
can drop the rcu_read_lock_bh.

[   98.502922] bond0: making interface eth1 the new active one
[   98.503039] ------------[ cut here ]------------
[   98.503039] WARNING: CPU: 0 PID: 1744 at kernel/softirq.c:150 __local_bh_enable_ip+0x96/0xc0()
[   98.503039] Modules linked in: bonding(OE) rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache netconsole ppdev joydev parport_pc serio_raw parport i2c_piix4 video acpi_cpufreq nfsd auth_rpcgss nfs_acl lockd grace sunrpc virtio_net e1000 ata_generic pcnet32 mii virtio_pci virtio_ring virtio pata_acpi
[   98.503039] CPU: 0 PID: 1744 Comm: ifenslave Tainted: G           OE   4.2.0-rc7+ #56
[   98.503039] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[   98.503039]  0000000000000000 00000000e96ba230 ffff880020c236b8 ffffffff8183f105
[   98.503039]  0000000000000000 0000000000000000 ffff880020c236f8 ffffffff810a9496
[   98.503039]  ffff88002ea99e08 0000000000000200 ffffffffa02a8e06 ffff88002ea99e08
[   98.503039] Call Trace:
[   98.503039]  [<ffffffff8183f105>] dump_stack+0x4c/0x65
[   98.503039]  [<ffffffff810a9496>] warn_slowpath_common+0x86/0xc0
[   98.503039]  [<ffffffffa02a8e06>] ? bond_poll_controller+0x146/0x250 [bonding]
[   98.503039]  [<ffffffff810a95ca>] warn_slowpath_null+0x1a/0x20
[   98.503039]  [<ffffffff810ae376>] __local_bh_enable_ip+0x96/0xc0
[   98.503039]  [<ffffffffa02a8e2f>] bond_poll_controller+0x16f/0x250 [bonding]
[   98.503039]  [<ffffffffa02a8cf3>] ? bond_poll_controller+0x33/0x250 [bonding]
[   98.503039]  [<ffffffff810feaed>] ? trace_hardirqs_off+0xd/0x10
[   98.503039]  [<ffffffff81848afb>] ? _raw_spin_unlock_irqrestore+0x5b/0x60
[   98.503039]  [<ffffffff816ec48e>] netpoll_poll_dev+0x6e/0x350
[   98.503039]  [<ffffffff816eb977>] ? netpoll_start_xmit+0x137/0x1d0
[   98.503039]  [<ffffffff816b2e8b>] ? __alloc_skb+0x5b/0x210
[   98.503039]  [<ffffffff816ec89d>] netpoll_send_skb_on_dev+0x12d/0x2a0
[   98.503039]  [<ffffffff816eccde>] netpoll_send_udp+0x2ce/0x430
[   98.503039]  [<ffffffffa0190850>] write_msg+0xb0/0xf0 [netconsole]
[   98.503039]  [<ffffffff81116b63>] call_console_drivers.constprop.25+0x133/0x260
[   98.503039]  [<ffffffff81117934>] console_unlock+0x2f4/0x580
[   98.503039]  [<ffffffff81117ea5>] ? vprintk_emit+0x2e5/0x630
[   98.503039]  [<ffffffff81117ee5>] vprintk_emit+0x325/0x630
[   98.503039]  [<ffffffff81118379>] vprintk_default+0x29/0x40
[   98.503039]  [<ffffffff8183de4f>] printk+0x55/0x6b
[   98.503039]  [<ffffffff816c754c>] __netdev_printk+0x16c/0x260
[   98.503039]  [<ffffffff816c7a12>] netdev_info+0x62/0x80
[   98.503039]  [<ffffffffa02ab464>] bond_change_active_slave+0x134/0x6a0 [bonding]
[   98.503039]  [<ffffffffa02aba95>] bond_select_active_slave+0xc5/0x310 [bonding]
[   98.503039]  [<ffffffffa02aeb78>] bond_enslave+0x1088/0x10c0 [bonding]
[   98.503039]  [<ffffffffa02af46b>] bond_do_ioctl+0x37b/0x400 [bonding]
[   98.503039]  [<ffffffff81101d8d>] ? trace_hardirqs_on+0xd/0x10
[   98.503039]  [<ffffffff816dc437>] ? rtnl_lock+0x17/0x20
[   98.503039]  [<ffffffff816e5fd1>] dev_ifsioc+0x331/0x3e0
[   98.503039]  [<ffffffff816e62dc>] dev_ioctl+0xec/0x6c0
[   98.503039]  [<ffffffff816a6c6a>] sock_do_ioctl+0x4a/0x60
[   98.503039]  [<ffffffff816a7300>] sock_ioctl+0x1c0/0x250
[   98.503039]  [<ffffffff81271bfe>] do_vfs_ioctl+0x2ee/0x540
[   98.503039]  [<ffffffff810fd943>] ? up_read+0x23/0x40
[   98.503039]  [<ffffffff81070993>] ? __do_page_fault+0x1d3/0x420
[   98.503039]  [<ffffffff8127e246>] ? __fget_light+0x66/0x90
[   98.503039]  [<ffffffff81271ec9>] SyS_ioctl+0x79/0x90
[   98.503039]  [<ffffffff8184936e>] entry_SYSCALL_64_fastpath+0x12/0x76
[   98.503039] ---[ end trace 00cfa804b0670051 ]---

Fixes: 616f4541 ("bonding: implement bond_poll_controller()")
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Acked-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The driver overrides the error returned by platform_get_irq() with -ENODEV
which e.g. precludes the deferred  probing from working. Propagate the real
error code to the driver core instead.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: David S. Miller <davem@davemloft.net>

The driver overrides the error returned by platform_get_irq() with -ENODEV
which e.g. precludes the deferred  probing from working. Propagate the real
error code to the driver core instead.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: David S. Miller <davem@davemloft.net>

RFC 5061:
    This is an opaque integer assigned by the sender to identify each
    request parameter.  The receiver of the ASCONF Chunk will copy this
    32-bit value into the ASCONF Response Correlation ID field of the
    ASCONF-ACK response parameter.  The sender of the ASCONF can use this
    same value in the ASCONF-ACK to find which request the response is
    for.  Note that the receiver MUST NOT change this 32-bit value.

    Address Parameter: TLV

    This field contains an IPv4 or IPv6 address parameter, as described
    in Section 3.3.2.1 of [RFC4960].

ASCONF chunk with Error Cause Indication Parameter (Unresolvable Address)
should be sent if the Delete IP Address is not part of the association.

  Endpoint A                           Endpoint B
  (ESTABLISHED)                        (ESTABLISHED)

  ASCONF        ----------------->
  (Delete IP Address)
                <-----------------      ASCONF-ACK
                                        (Unresolvable Address)
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

__netlink_lookup_frame() was always called with the same "pos"
value in netlink_forward_ring(). It will look at the same ring entry
header over and over again, every time through this loop. Then cycle
through the whole ring, advancing ring->head, not "pos" until it
equals the "ring->head != head" loop test fails.
Signed-off-by: Ken-ichirou MATSUZAWA <chamas@h4.dion.ne.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

Since commit c05cdb1b ("netlink: allow large data transfers from
user-space"), the kernel may fail to allocate the necessary room for the
acknowledgment message back to userspace. This patch introduces a new
socket option that trims off the payload of the original netlink message.

The netlink message header is still included, so the user can guess from
the sequence number what is the message that has triggered the
acknowledgment.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Fix build with !CONFIG_NF_CONNTRACK_MARK && CONFIG_OPENVSWITCH_CONNTRACK

Fixes: 182e3042 ("openvswitch: Allow matching on conntrack mark")
Reported-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: Joe Stringer <joestringer@nicira.com>
Tested-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pablo Neira Ayuso says:

====================
Netfilter updates for net-next

The following patchset contains Netfilter/IPVS updates for your net-next tree.
In sum, patches to address fallout from the previous round plus updates from
the IPVS folks via Simon Horman, they are:

1) Add a new scheduler to IPVS: The weighted overflow scheduling algorithm
   directs network connections to the server with the highest weight that is
   currently available and overflows to the next when active connections exceed
   the node's weight. From Raducu Deaconu.

2) Fix locking ordering in IPVS, always take rtnl_lock in first place. Patch
   from Julian Anastasov.

3) Allow to indicate the MTU to the IPVS in-kernel state sync daemon. From
   Julian Anastasov.

4) Enhance multicast configuration for the IPVS state sync daemon. Also from
   Julian.

5) Resolve sparse warnings in the nf_dup modules.

6) Fix a linking problem when CONFIG_NF_DUP_IPV6 is not set.

7) Add ICMP codes 5 and 6 to IPv6 REJECT target, they are more informative
   subsets of code 1. From Andreas Herz.

8) Revert the jumpstack size calculation from mark_source_chains due to chain
   depth miscalculations, from Florian Westphal.

9) Calm down more sparse warning around the Netfilter tree, again from Florian
   Westphal.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Alexei Starovoitov says:

====================
support for '%s' in bpf_trace_printk

v2->v3:
fix the comment to mention that strncpy_from_unsafe() returns
the length of the string including the trailing NUL.

v1->v2:
patch 1: generalize FETCH_FUNC_NAME(memory, string) into
strncpy_from_unsafe()
patch 2: use it in bpf_trace_printk
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

%s specifier makes bpf program and kernel debugging easier.
To make sure that trace_printk won't crash the unsafe string
is copied into stack and unsafe pointer is substituted.

The following C program:
 #include <linux/fs.h>
int foo(struct pt_regs *ctx, struct filename *filename)
{
  void *name = 0;

  bpf_probe_read(&name, sizeof(name), &filename->name);
  bpf_trace_printk("executed %s\n", name);
  return 0;
}

when attached to kprobe do_execve()
will produce output in /sys/kernel/debug/tracing/trace_pipe :
    make-13492 [002] d..1  3250.997277: : executed /bin/sh
      sh-13493 [004] d..1  3250.998716: : executed /usr/bin/gcc
     gcc-13494 [002] d..1  3250.999822: : executed /usr/lib/gcc/x86_64-linux-gnu/4.7/cc1
     gcc-13495 [002] d..1  3251.006731: : executed /usr/bin/as
     gcc-13496 [002] d..1  3251.011831: : executed /usr/lib/gcc/x86_64-linux-gnu/4.7/collect2
collect2-13497 [000] d..1  3251.012941: : executed /usr/bin/ld
Suggested-by: Brendan Gregg <brendan.d.gregg@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>