This is an infrastructure step for querying VF and PF counters.

This code was in the IB driver, move it to the mlx4 core driver
so it will be accessible for more use cases.
Signed-off-by: NEran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: NHadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

As IB VFs are not capable to read the port counters through MADs,
move there to read their own QP counters to gather statistics.
Signed-off-by: NEran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: NHadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This is an infrastructure step to attach all the QPs opened from the
IB driver to a counter in order to collect VF stats from the PF using
those counters.

If the port's type is Ethernet, the counter policy demands two counters
per port (one for RoCE and one for Ethernet). The port default counter
(allocated in mlx4_core) is used for the Ethernet netdev QPs and we
allocate another counter for RoCE.

If the port's traffic is Infiniband, the counter policy demands
one counter per port, so it can use the port's default counter.

Also, Add 'allocated' flag for each counter in order to clean it at
unload.
Signed-off-by: NEran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: NHadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Default counter per port will be allocated at the mlx4 core driver load.

Every QP opened by the Ethernet driver will be attached to the port's default
counter.  This is an infrastructure step to collect VF statistics from the PF.
Signed-off-by: NEran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: NHadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Counter will get its port attribute within the resource tracker when
the first QP attached to it is modified to RTR. If a QP is counter-less,
an attempt to create a new counter with assigned port will be made.
Signed-off-by: NEran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: NHadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Each physical function has a guarantee of two counters per port, one
for a default counter and one for the IB driver.

Each virtual function has a guarantee of one counter per port.
All other counters are free and can be obtained on demand.

This is a preparation step for supporting a get_vf_stats ndo call,
so we can promise a counter for every VF in order to collect their
statistics from the PF context.
Signed-off-by: NEran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: NHadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Since virtual functions get their counters indices allocation from the PF,
allocate counters indices bitmap only in case the function isn't virtual.

Also, check that the device has counters to allocate before creating the
indices bitmap table.
Signed-off-by: NEran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: NHadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Reserve the last valid counter index for "sink" counter, when a
new counter cannot be allocated, the driver will use this counter.

In order to avoid allocating this counter on any other flow, fix the
indices bitmap allocation range, and reserve the sink counter index.

Add macro for the sink counter index and replace all appearences of the
index with the macro.
Signed-off-by: NEran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: NHadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add resetting the counter data to the free counter flow, so the counter's
data won't be accessible anymore if querying the counter. Also, on next
counter allocation (to another VM for example), it will be fresh and clear.
Signed-off-by: NEran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: NHadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

If counters are not supported by the device. The indices bitmap table is not
allocated during initialization. Add the symmetrical check before cleaning
the counters bitmap table or freeing a counter.
Signed-off-by: NEran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: NHadar Hen Zion <hadarh@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

We need to delete from offload the device externally learnded fdbs when any
one of these events happen:

1) Bridge ages out fdb.  (When bridge is doing ageing vs. device doing
ageing.  If device is doing ageing, it would send SWITCHDEV_FDB_DEL
directly).

2) STP state change flushes fdbs on port.

3) User uses sysfs interface to flush fdbs from bridge or bridge port:

	echo 1 >/sys/class/net/BR_DEV/bridge/flush
	echo 1 >/sys/class/net/BR_PORT/brport/flush

4) Offload driver send event SWITCHDEV_FDB_DEL to delete fdb entry.

For rocker, we can now get called to delete fdb entry in wait and nowait
contexts, so set NOWAIT flag when deleting fdb entry.
Signed-off-by: NScott Feldman <sfeldma@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Samuel Ortiz says:

====================
NFC 4.2 pull request

This is the NFC pull request for 4.2.

- NCI drivers can now define their own handlers for processing
  proprietary NCI responses and notifications.

- NFC vendors can use a dedicated netlink API to send their own
  proprietary commands, like e.g. all commands needed to implement
  vendor specific manufacturing tools.

- A new generic NCI over UART driver against which any NCI chipset
  running on top of a serial interface can register.

- The st21nfcb driver is renamed to st-nci as it can and will support
  most of ST Microelectronics NCI chipsets.

- The st21nfcb driver can put its CLF in hibernate mode and save
  significant amount of power.

- A few st21nfcb minor fixes.

- The NXP NCI driver now supports ACPI enumeration.

- The Marvell NCI driver now supports both USB and serial
  physical interfaces.

- The Marvell NCI drivers also supports NCI frames being muxed
  over HCI. This is a setting that can be defined by a DT property.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Nikolay Aleksandrov says:

====================
bonding: extend the 3ad exported attributes

These are two small patches that export actor_oper_port_state and
partner_oper_port_state via netlink and sysfs, until now they were only
exported via bond's proc entry. If this set gets accepted I have an iproute2
patch prepared that will export them with which I tested these changes.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Export the partner_oper_port_state of each port via sysfs and netlink.
In 802.3ad mode it is valuable for the user to be able to check the
partner_oper state, it is already exported via bond's proc entry.
Signed-off-by: NNikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: NAndy Gospodarek <gospo@cumulusnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Export the actor_oper_port_state of each port via sysfs and netlink.
In 802.3ad mode it is valuable for the user to be able to check the
actor_oper state, it is already exported via bond's proc entry.
Signed-off-by: NNikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: NAndy Gospodarek <gospo@cumulusnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Scott Feldman says:

====================
rocker: revert back to support for nowait processes

One of the items removed from the rocker driver in the Spring Cleanup patch
series was the ability to mark processing in the driver as "no wait" for
those contexts where we cannot sleep.  Turns out, we have "no wait"
contexts where we want to program the device and we don't want to defer the
processing to a process context.  So re-add the ROCKER_OP_FLAG_NOWAIT flag
to mark such processes, and propagate flags to mem allocator and to the
device cmd executor.  With NOWAIT, mem allocs are GFP_ATOMIC and device
cmds are queued to the device, but the driver will not wait (sleep) for the
response back from the device.

My bad for removing NOWAIT support in the first place; I thought we could
swing non-sleep contexts to process context using a work queue, for
example, but there is push-back to keep processing in original context.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

rocker_port_stop can be called from atomic and non-atomic contexts.  Since
we can't test what context we're getting called in, do the processing as
'no wait', which will cover all cases.
Signed-off-by: NScott Feldman <sfeldma@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NScott Feldman <sfeldma@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

We can get STP updates from the bridge driver in atomic and non-atomic
contexts.  Since we can't test what context we're getting called in,
do the STP processing as 'no wait', which will cover all cases.
Signed-off-by: NScott Feldman <sfeldma@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Neigh update event handler runs in a context where we can't sleep, so mark
processing in driver with ROCKER_OP_FLAG_NOWAIT.  NOWAIT will use
GFP_ATOMIC for allocations and will queue cmds to the device's cmd ring but
will not wait (sleep) for cmd response back from device.
Signed-off-by: NScott Feldman <sfeldma@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

One of the items removed from the rocker driver in the Spring Cleanup patch
series was the ability to mark processing in the driver as "no wait" for
those contexts where we cannot sleep.  Turns out, we have "no wait"
contexts where we want to program the device.  So re-add the
ROCKER_OP_FLAG_NOWAIT flag to mark such processes, and propagate flags to
mem allocator and to the device cmd executor.  With NOWAIT, mem allocs are
GFP_ATOMIC and device cmds are queued to the device, but the driver will
not wait (sleep) for the response back from the device.

My bad for removing NOWAIT support in the first place; I thought we could
swing non-sleep contexts to process context using a work queue, for
example, but there is push-back to keep processing in original context.
Signed-off-by: NScott Feldman <sfeldma@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

rocker->neigh_tbl_next_index is used to generate unique indices for neigh
entries programmed into the device.  The way new indices were generated was
racy with the new prepare-commit transaction model.  A simple fix here
removes the race.  The race was with two processes getting the same index,
one process using prepare-commit, the other not:

Proc A					Proc B

PREPARE phase
get neigh_tbl_next_index

					NONE phase
					get neigh_tbl_next_index
					neigh_tbl_next_index++

COMMIT phase
neigh_tbl_next_index++

Both A and B got the same index.  The fix is to store and increment
neigh_tbl_next_index in the PREPARE (or NONE) phase and use value in COMMIT
phase:

Proc A					Proc B

PREPARE phase
get neigh_tbl_next_index
neigh_tbl_next_index++

					NONE phase
					get neigh_tbl_next_index
					neigh_tbl_next_index++

COMMIT phase
// use value stashed in PREPARE phase
Reported-by: NSimon Horman <simon.horman@netronome.com>
Signed-off-by: NScott Feldman <sfeldma@gmail.com>
Reviewed-by: NSimon Horman <simon.horman@netronome.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The ports array is filled in as ports are probed, but if probing doesn't
finish, we need to stop only those ports that where probed successfully.
Check the ports array for NULL to skip un-probed ports when stopping.
Signed-off-by: NScott Feldman <sfeldma@gmail.com>
Acked-by: NJiri Pirko <jiri@resnulli.us>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Using a function instead of a macro is cleaner and remove
following W=1 warnings (extract)

In file included from net/ipv6/ip6_vti.c:29:0:
net/ipv6/ip6_vti.c: In function ‘vti6_dev_init_gen’:
include/linux/netdevice.h:2029:18: warning: variable ‘stat’ set but not
used [-Wunused-but-set-variable]
    typeof(type) *stat;   \
                  ^
net/ipv6/ip6_vti.c:862:16: note: in expansion of macro
‘netdev_alloc_pcpu_stats’
  dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
                ^
  CC [M]  net/ipv6/sit.o
In file included from net/ipv6/sit.c:30:0:
net/ipv6/sit.c: In function ‘ipip6_tunnel_init’:
include/linux/netdevice.h:2029:18: warning: variable ‘stat’ set but not
used [-Wunused-but-set-variable]
    typeof(type) *stat;   \
                  ^
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

v2:

Move struct switchdev_obj automatics to inner scope where there used.

v1:

To maintain backward compatibility with the existing iproute2 "bridge vlan"
command, let bridge's setlink/dellink handler call into either the port
driver's 8021q ndo ops or the port driver's bridge_setlink/dellink ops.

This allows port driver to choose 8021q ops or the newer
bridge_setlink/dellink ops when implementing VLAN add/del filtering on the
device.  The iproute "bridge vlan" command does not need to be modified.

To summarize using the "bridge vlan" command examples, we have:

1) bridge vlan add|del vid VID dev DEV

Here iproute2 sets MASTER flag.  Bridge's bridge_setlink/dellink is called.
Vlan is set on bridge for port.  If port driver implements ndo 8021q ops,
call those to port driver can install vlan filter on device.  Otherwise, if
port driver implements bridge_setlink/dellink ops, call those to install
vlan filter to device.  This option only works if port is bridged.

2) bridge vlan add|del vid VID dev DEV master

Same as 1)

3) bridge vlan add|del vid VID dev DEV self

Bridge's bridge_setlink/dellink isn't called.  Port driver's
bridge_setlink/dellink is called, if implemented.  This option works if
port is bridged or not.  If port is not bridged, a VLAN can still be
added/deleted to device filter using this variant.

4) bridge vlan add|del vid VID dev DEV master self

This is a combination of 1) and 3), but will only work if port is bridged.
Signed-off-by: NScott Feldman <sfeldma@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Alexei Starovoitov says:

====================
v1->v2: switched to init_user_ns from current_user_ns as suggested by Andy

Introduce new helpers to access 'struct task_struct'->pid, tgid, uid, gid, comm
fields in tracing and networking.

Share bpf_trace_printk() and bpf_get_smp_processor_id() helpers between
tracing and networking.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

It's useful to do per-cpu histograms.
Suggested-by: NDaniel Wagner <daniel.wagner@bmw-carit.de>
Signed-off-by: NAlexei Starovoitov <ast@plumgrid.com>
Acked-by: NDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

bpf_trace_printk() is a helper function used to debug eBPF programs.
Let socket and TC programs use it as well.
Note, it's DEBUG ONLY helper. If it's used in the program,
the kernel will print warning banner to make sure users don't use
it in production.
Signed-off-by: NAlexei Starovoitov <ast@plumgrid.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

eBPF programs attached to kprobes need to filter based on
current->pid, uid and other fields, so introduce helper functions:

u64 bpf_get_current_pid_tgid(void)
Return: current->tgid << 32 | current->pid

u64 bpf_get_current_uid_gid(void)
Return: current_gid << 32 | current_uid

bpf_get_current_comm(char *buf, int size_of_buf)
stores current->comm into buf

They can be used from the programs attached to TC as well to classify packets
based on current task fields.

Update tracex2 example to print histogram of write syscalls for each process
instead of aggregated for all.
Signed-off-by: NAlexei Starovoitov <ast@plumgrid.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Pablo Neira Ayuso says:

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

This a bit large (and late) patchset that contains Netfilter updates for
net-next. Most relevantly br_netfilter fixes, ipset RCU support, removal of
x_tables percpu ruleset copy and rework of the nf_tables netdev support. More
specifically, they are:

1) Warn the user when there is a better protocol conntracker available, from
   Marcelo Ricardo Leitner.

2) Fix forwarding of IPv6 fragmented traffic in br_netfilter, from Bernhard
   Thaler. This comes with several patches to prepare the change in first place.

3) Get rid of special mtu handling of PPPoE/VLAN frames for br_netfilter. This
   is not needed anymore since now we use the largest fragment size to
   refragment, from Florian Westphal.

4) Restore vlan tag when refragmenting in br_netfilter, also from Florian.

5) Get rid of the percpu ruleset copy in x_tables, from Florian. Plus another
   follow up patch to refine it from Eric Dumazet.

6) Several ipset cleanups, fixes and finally RCU support, from Jozsef Kadlecsik.

7) Get rid of parens in Netfilter Kconfig files.

8) Attach the net_device to the basechain as opposed to the initial per table
   approach in the nf_tables netdev family.

9) Subscribe to netdev events to detect the removal and registration of a
   device that is referenced by a basechain.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

In case the net_device is gone, we have to unregister the hooks and put back
the reference on the net_device object. Once it comes back, register them
again. This also covers the device rename case.

This patch also adds a new flag to indicate that the basechain is disabled, so
their hooks are not registered. This flag is used by the netdev family to
handle the case where the net_device object is gone. Currently this flag is not
exposed to userspace.
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>

This wrapper functions take care of hook registration for basechains.
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>

The device is part of the hook configuration, so instead of a global
configuration per table, set it to each of the basechain that we create.

This patch reworks ebddf1a8 ("netfilter: nf_tables: allow to bind table to
net_device").

Note that this adds a dev_name field in the nft_base_chain structure which is
required the netdev notification subscription that follows up in a patch to
handle gone net_devices.
Suggested-by: NPatrick McHardy <kaber@trash.net>
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>

After Florian patches, there is no need for XT_TABLE_INFO_SZ anymore :
Only one copy of table is kept, instead of one copy per cpu.

We also can avoid a dereference if we put table data right after
xt_table_info. It reduces register pressure and helps compiler.

Then, we attempt a kmalloc() if total size is under order-3 allocation,
to reduce TLB pressure, as in many cases, rules fit in 32 KB.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Cc: Florian Westphal <fw@strlen.de>
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>

Jozsef Kadlecsik says:

====================
ipset patches for nf-next

Please consider to apply the next bunch of patches for ipset. First
comes the small changes, then the bugfixes and at the end the RCU
related patches.

* Use MSEC_PER_SEC consistently instead of the number.
* Use SET_WITH_*() helpers to test set extensions from Sergey Popovich.
* Check extensions attributes before getting extensions from Sergey Popovich.
* Permit CIDR equal to the host address CIDR in IPv6 from Sergey Popovich.
* Make sure we always return line number on batch in the case of error
  from Sergey Popovich.
* Check CIDR value only when attribute is given from Sergey Popovich.
* Fix cidr handling for hash:*net* types, reported by Jonathan Johnson.
* Fix parallel resizing and listing of the same set so that the original
  set is kept for the whole dumping.
* Make sure listing doesn't grab a set which is just being destroyed.
* Remove rbtree from ip_set_hash_netiface.c in order to introduce RCU.
* Replace rwlock_t with spinlock_t in "struct ip_set", change the locking
  in the core and simplifications in the timeout routines.
* Introduce RCU locking in bitmap:* types with a slight modification in the
  logic on how an element is added.
* Introduce RCU locking in hash:* types. This is the most complex part of
  the changes.
* Introduce RCU locking in list type where standard rculist is used.
* Fix coding styles reported by checkpatch.pl.
====================
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>

According to the reporter, they are not needed.
Reported-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>

Fixes cross-compile to mips.
Signed-off-by: NKenneth Klette Jonassen <kennetkl@ifi.uio.no>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>

Standard rculist is used.
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>

Three types of data need to be protected in the case of the hash types:

a. The hash buckets: standard rcu pointer operations are used.
b. The element blobs in the hash buckets are stored in an array and
   a bitmap is used for book-keeping to tell which elements in the array
   are used or free.
c. Networks per cidr values and the cidr values themselves are stored
   in fix sized arrays and need no protection. The values are modified
   in such an order that in the worst case an element testing is repeated
   once with the same cidr value.

The ipset hash approach uses arrays instead of lists and therefore is
incompatible with rhashtable.

Performance is tested by Jesper Dangaard Brouer:

Simple drop in FORWARD
~~~~~~~~~~~~~~~~~~~~~~

Dropping via simple iptables net-mask match::

 iptables -t raw -N simple || iptables -t raw -F simple
 iptables -t raw -I simple  -s 198.18.0.0/15 -j DROP
 iptables -t raw -D PREROUTING -j simple
 iptables -t raw -I PREROUTING -j simple

Drop performance in "raw": 11.3Mpps

Generator: sending 12.2Mpps (tx:12264083 pps)

Drop via original ipset in RAW table
~~~~~~~~~~~~~~~~~~~~~~~~~~~

Create a set with lots of elements::

 sudo ./ipset destroy test
 echo "create test hash:ip hashsize 65536" > test.set
 for x in `seq 0 255`; do
    for y in `seq 0 255`; do
        echo "add test 198.18.$x.$y" >> test.set
    done
 done
 sudo ./ipset restore < test.set

Dropping via ipset::

 iptables -t raw -F
 iptables -t raw -N net198 || iptables -t raw -F net198
 iptables -t raw -I net198 -m set --match-set test src -j DROP
 iptables -t raw -I PREROUTING -j net198

Drop performance in "raw" with ipset: 8Mpps

Perf report numbers ipset drop in "raw"::

 +   24.65%  ksoftirqd/1  [ip_set]           [k] ip_set_test
 -   21.42%  ksoftirqd/1  [kernel.kallsyms]  [k] _raw_read_lock_bh
    - _raw_read_lock_bh
       + 99.88% ip_set_test
 -   19.42%  ksoftirqd/1  [kernel.kallsyms]  [k] _raw_read_unlock_bh
    - _raw_read_unlock_bh
       + 99.72% ip_set_test
 +    4.31%  ksoftirqd/1  [ip_set_hash_ip]   [k] hash_ip4_kadt
 +    2.27%  ksoftirqd/1  [ixgbe]            [k] ixgbe_fetch_rx_buffer
 +    2.18%  ksoftirqd/1  [ip_tables]        [k] ipt_do_table
 +    1.81%  ksoftirqd/1  [ip_set_hash_ip]   [k] hash_ip4_test
 +    1.61%  ksoftirqd/1  [kernel.kallsyms]  [k] __netif_receive_skb_core
 +    1.44%  ksoftirqd/1  [kernel.kallsyms]  [k] build_skb
 +    1.42%  ksoftirqd/1  [kernel.kallsyms]  [k] ip_rcv
 +    1.36%  ksoftirqd/1  [kernel.kallsyms]  [k] __local_bh_enable_ip
 +    1.16%  ksoftirqd/1  [kernel.kallsyms]  [k] dev_gro_receive
 +    1.09%  ksoftirqd/1  [kernel.kallsyms]  [k] __rcu_read_unlock
 +    0.96%  ksoftirqd/1  [ixgbe]            [k] ixgbe_clean_rx_irq
 +    0.95%  ksoftirqd/1  [kernel.kallsyms]  [k] __netdev_alloc_frag
 +    0.88%  ksoftirqd/1  [kernel.kallsyms]  [k] kmem_cache_alloc
 +    0.87%  ksoftirqd/1  [xt_set]           [k] set_match_v3
 +    0.85%  ksoftirqd/1  [kernel.kallsyms]  [k] inet_gro_receive
 +    0.83%  ksoftirqd/1  [kernel.kallsyms]  [k] nf_iterate
 +    0.76%  ksoftirqd/1  [kernel.kallsyms]  [k] put_compound_page
 +    0.75%  ksoftirqd/1  [kernel.kallsyms]  [k] __rcu_read_lock

Drop via ipset in RAW table with RCU-locking
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

With RCU locking, the RW-lock is gone.

Drop performance in "raw" with ipset with RCU-locking: 11.3Mpps
Performance-tested-by: NJesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>