4235 Commits

Author SHA1 Message Date
Nelson Escobar
65ca78fdf9 enic: fix Rx descriptor limit
On initialization, the rq descriptor count was set to the limit
of the vic.  When the requested number of rx descriptors was
less than this count, enic_alloc_rq() was incorrectly setting
the count to the lower value.  This results in later calls to
enic_alloc_rq() incorrectly using the lower value as the adapter
limit.

Fixes: fefed3d1e62c ("enic: new driver")

Signed-off-by: Nelson Escobar <neescoba@cisco.com>
Reviewed-by: John Daley <johndale@cisco.com>
2016-03-25 19:01:37 +01:00
John Daley
5752464874 enic: update maintainers
Change maintainers for ENIC PMD and fix pointer to enic
documentation in MAINTAINERS.

Signed-off-by: John Daley <johndale@cisco.com>
2016-03-25 19:01:37 +01:00
Nélio Laranjeiro
fbd2319037 mlx5: fix null RSS key handling
Update function can be called with no key to enable or disable a RSS
protocol, or with a key to be applied to the desired protocols.

Fixes: 2f97422e7759 ("mlx5: support RSS hash update and get")

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
2016-03-25 19:01:37 +01:00
Nélio Laranjeiro
c64ccc0eca mlx5: fix overwritten RSS configuration
RSS configuration provided by the application should not be used as storage
by the PMD.

Fixes: 2f97422e7759 ("mlx5: support RSS hash update and get")

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
2016-03-25 19:01:37 +01:00
Xiao Wang
2c4ee442c4 ixgbe: fix RETA query and update on X550
For x550 device, the reta table has 512 entries, but in function
ixgbe_dev_rss_reta_query and ixgbe_dev_rss_reta_update we use an
"uint8_t i" to traverse the entries, this will lead the function
to an endless loop.

This patch changes the data type from uint8_t to uint16_t to fix
the issue.

Fixes: 4bee94a6c22f ("ixgbe: support 512 RSS entries on x550")

Signed-off-by: Wang Xiao W <xiao.w.wang@intel.com>
Acked-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
2016-03-25 19:01:37 +01:00
John Daley
50765c820e enic: remove packet error conditional
small cleanup to remove conditional.

Signed-off-by: John Daley <johndale@cisco.com>
2016-03-25 19:01:37 +01:00
John Daley
5776c30293 enic: fix error packets handling
If the packet_error bit in the completion descriptor is set, the
remainder of the descriptor and data are invalid. PKT_RX_MAC_ERR
was set in the mbuf->ol_flags if packet_error was set and used
later to indicate an error packet. But since PKT_RX_MAC_ERR is
defined as 0, mbuf flags and packet types and length were being
misinterpreted.

Make the function enic_cq_rx_to_pkt_err_flags() return true for error
packets and use the return value instead of mbuf->ol_flags to indicate
error packets. Also remove warning for error packets and rely on
rx_error stats.

Fixes: 947d860c821f ("enic: improve Rx performance")

Signed-off-by: John Daley <johndale@cisco.com>
2016-03-25 19:01:37 +01:00
John Daley
3253bbc79c enic: fix mbuf flags on Rx
In the receive path, the function to set mbuf ol_flags used the
mbuf packet_type before it was set.

Fixes: 947d860c821f ("enic: improve Rx performance")

Signed-off-by: John Daley <johndale@cisco.com>
2016-03-25 19:01:31 +01:00
Nelson Escobar
ddf2da3ece enic: fix crash when allocating too many queues
Add checks to make sure we don't try to allocate more tx or rx queues
than we support.

Fixes: fefed3d1e62c ("enic: new driver")

Signed-off-by: Nelson Escobar <neescoba@cisco.com>
Reviewed-by: John Daley <johndale@cisco.com>
2016-03-25 18:56:44 +01:00
Nelson Escobar
bba57df386 enic: add missing newline to print statements
Add the missing '\n' character to the end of a few print statements.

Fixes: fefed3d1e62c ("enic: new driver")

Signed-off-by: Nelson Escobar <neescoba@cisco.com>
Acked-by: John Daley <johndale@cisco.com>
2016-03-25 18:56:44 +01:00
Yaacov Hazan
e192ef8034 mlx5: add VLAN insertion offload
VLAN insertion can be done in hardware when supported in Verbs. A software
fallback is provided otherwise. The software implementation is also used
when multi-packet send is enabled on a queue, as both features are mutually
exclusive.

Signed-off-by: Yaacov Hazan <yaacovh@mellanox.com>
Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
2016-03-25 18:56:44 +01:00
Olga Shern
4d803a7246 mlx5: support HW packet padding
Environment variable MLX5_PMD_ENABLE_PADDING enables HW packet padding
in PCI bus transactions.

When packet size is cache aligned and CRC stripping is enabled, 4 fewer
bytes are written to the PCI bus. Enabling padding makes such packets
aligned again.

In cases where PCI bandwidth is the bottleneck, padding can improve
performance by 10%.

This is disabled by default since this can also decrease performance for
unaligned packet sizes.

Signed-off-by: Olga Shern <olgas@mellanox.com>

fix packet padding macro check

Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
2016-03-25 18:56:44 +01:00
Olga Shern
4d3267092a mlx5: add Rx CRC stripping configuration
Until now, CRC was always stripped by hardware. This feature can be
configured since MLNX_OFED >= 3.2.

Signed-off-by: Olga Shern <olgas@mellanox.com>
2016-03-25 18:56:44 +01:00
Or Ami
a48deada65 mlx5: allow operation in secondary processes
Secondary processes are expected to use queues and other resources
allocated by the primary, however Verbs resources can only be shared
between processes when inherited through fork().

This limitation can be worked around for TX by configuring separate queues
from secondary processes.

Signed-off-by: Or Ami <ora@mellanox.com>
2016-03-25 18:56:44 +01:00
Or Ami
62072098b5 mlx5: support setting link up or down
Add driver functions to set link state up or down.
Burst functions are updated to make sure applications cannot attempt to
send/receive after link is brought down.

Signed-off-by: Or Ami <ora@mellanox.com>
2016-03-25 18:56:44 +01:00
Jingjing Wu
ae19955e7c i40evf: support reporting PF reset
When Linux PF and DPDK VF are used for i40e PMD, when a PF reset occurs,
an interrupt will go via adminq event to inform the VF of the reset.
A callback mechanism is introduced for the VF to allow it to invoke a
registered callback when PF  reset happens.

Users can register a callback for this interrupt event using:
  rte_eth_dev_callback_register(portid,
		RTE_ETH_EVENT_INTR_RESET,
		reset_event_callback,
		arg);

Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
Acked-by: Helin Zhang <helin.zhang@intel.com>
2016-03-25 18:56:44 +01:00
Jingjing Wu
95cd21f45d i40evf: allocate virtchnl commands buffer per VF
Currently, i40evf PMD uses a global static buffer to send virtchnl
commands to host driver. It is shared by multiple VFs.
This patch changed to allocate a virtchnl cmd buffer for each VF.

Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
Acked-by: Helin Zhang <helin.zhang@intel.com>
2016-03-25 18:56:44 +01:00
Tetsuya Mukawa
ee584e9710 vhost: add driver on top of the library
The patch introduces a new PMD. This PMD is implemented as thin wrapper
of librte_vhost. It means librte_vhost is also needed to compile the PMD.
The vhost messages will be handled only when a port is started. So start
a port first, then invoke QEMU.

The PMD has 2 parameters.
 - iface:  The parameter is used to specify a path to connect to a
           virtio-net device.
 - queues: The parameter is used to specify the number of the queues
           virtio-net device has.
           (Default: 1)

Here is an example.
$ ./testpmd -c f -n 4 --vdev 'eth_vhost0,iface=/tmp/sock0,queues=1' -- -i

To connect above testpmd, here is qemu command example.

$ qemu-system-x86_64 \
        <snip>
        -chardev socket,id=chr0,path=/tmp/sock0 \
        -netdev vhost-user,id=net0,chardev=chr0,vhostforce,queues=1 \
        -device virtio-net-pci,netdev=net0,mq=on

Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Acked-by: Rich Lane <rich.lane@bigswitch.com>
Tested-by: Rich Lane <rich.lane@bigswitch.com>

Update for queue state event name:
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
2016-03-25 18:56:44 +01:00
Tetsuya Mukawa
89a28c2880 ethdev: add queue state change event type
This patch adds a below event type.
 - RTE_ETH_EVENT_QUEUE_STATE

This event will occur when some queues are enabled or disabled.
So far, only vhost PMD supports the event, and it indicates some queues
are enabled or disabled by virtio-net device. Such an event is needed
because virtio-net device may not enable all queues vhost PMD prepare.

Because only vhost PMD uses the event so far, it isn't an actual hardware
interrupt but a simple software event.

Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Acked-by: Rich Lane <rich.lane@bigswitch.com>
Tested-by: Rich Lane <rich.lane@bigswitch.com>

Minor modification to event name and comment:
Suggested-by: Thomas Monjalon <thomas.monjalon@6wind.com>
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
2016-03-25 18:56:43 +01:00
Jan Medala
1173fca25a ena: add polling-mode driver
This is a PMD for the Amazon ethernet ENA (Elastic Network Adapters)
family.
The driver operates variety of ENA adapters through feature negotiation
with the adapter and upgradable commands set.
ENA driver handles PCI Physical and Virtual ENA functions.

Signed-off-by: Evgeny Schemeilin <evgenys@amazon.com>
Signed-off-by: Jan Medala <jan@semihalf.com>
Signed-off-by: Jakub Palider <jpa@semihalf.com>

Release Note addition:
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
2016-03-25 18:56:43 +01:00
Jan Medala
9ba7981ec9 ena: add communication layer for DPDK
Implementation of platform specific code for ENA communication layer.

Signed-off-by: Evgeny Schemeilin <evgenys@amazon.com>
Signed-off-by: Jan Medala <jan@semihalf.com>
Signed-off-by: Jakub Palider <jpa@semihalf.com>
2016-03-25 18:56:43 +01:00
Jan Medala
99ecfbf845 ena: import communication layer
Low level common abstraction for ENA device communication.

Signed-off-by: Netanel Belgazal <netanel@amazon.com>
Signed-off-by: Jan Medala <jan@semihalf.com>
Signed-off-by: Jakub Palider <jpa@semihalf.com>
2016-03-25 18:56:43 +01:00
Jan Medala
cf8a122c29 ena: introduce documentation
Signed-off-by: Alexander Matushevsky <matua@amazon.com>
Signed-off-by: Jan Medala <jan@semihalf.com>
Signed-off-by: Jakub Palider <jpa@semihalf.com>
2016-03-25 18:56:43 +01:00
Jianfeng Tan
78a38edf66 ethdev: query supported packet types
Add a new API rte_eth_dev_get_supported_ptypes to query what packet types
can be filled by a given device. The device should be already started or
its PMD RX burst function already decided, since the packet types supported
may vary depending on RX function.

Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
2016-03-25 18:56:43 +01:00
Thomas Monjalon
e13fbc065c scripts: improve quiet checkpatch
The option --no-summary will remove this line in quiet mode:
	total: 1 errors, 0 warnings, 7 lines checked

Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>
2016-03-24 22:16:01 +01:00
Olivier Matz
0853f25d25 scripts: fix checkpatch help
When started without defining DPDK_CHECKPATCH_PATH, the usage was not
displayed.

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
2016-03-24 22:04:10 +01:00
Jerin Jacob
4e72892c33 tools: fix setup with built-in kernel modules
probe the kernel module existence through /sys/module/ to make it work
with both module and inbuilt kernel module

Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
2016-03-24 22:04:10 +01:00
Jerin Jacob
080358a315 tools: fix setup with huge page size other than 2MB
Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
2016-03-24 22:04:10 +01:00
Mauricio Vasquez B
b610787fb9 tools: fix flake8 warnings in bind script
flake8 checks were run for both python 2.7 and 3.4

There were some style issues as:
- Line width > 79
- No double blank line before function definition
- No double blank space before inline comment
- Some other minor issues

Signed-off-by: Mauricio Vasquez B <mauricio.vasquezbernal@studenti.polito.it>
Acked-by: John McNamara <john.mcnamara@intel.com>
2016-03-24 22:04:10 +01:00
Keith Wiles
0f0ae3f1b0 tools: remove extra blank lines in CPU layout
The output for the core list included an extra linefeed making
the number of lines displayed much larger then required.

Signed-off-by: Keith Wiles <keith.wiles@intel.com>
2016-03-24 22:04:10 +01:00
Olivier Matz
a690da8df4 app/test: fix check for virtual ring device
This test expects that a vdev is instanciated on the command
line. If it's not the case, just skip this part.

Fixes: 4ea3801b3222 ("app/test: fix ring unit test")

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
2016-03-24 21:12:45 +01:00
Olivier Matz
f632ff17a6 app/test: display command line when starting
It's useful for debug purposes to see the command line used by
autotest.py.

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
2016-03-24 21:12:45 +01:00
Pablo de Lara
437958e847 examples/l2fwd-crypto: add NULL algorithms
NULL crypto operation is now supported, but l2fwd-crypto
was missing an update on the list of supported algorithms
that can be passed from command line.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
2016-03-24 20:53:40 +01:00
Pablo de Lara
3d6e4bcf51 examples/l2fwd-crypto: add AES-GCM algorithm
AES GCM is an algorithm for both ciphering and authentication,
but the authentication algorithm was missing in the
list of supported algorithms that can be passed from command line.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
2016-03-24 20:53:40 +01:00
Pablo de Lara
d29ea84393 examples/l2fwd-crypto: add SNOW 3G algorithms
Since SNOW3G UEA2/UIA2 are supported now by both HW and SW,
l2fwd-crypto may use them, extending the list of algorithms
parsed from command line.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
2016-03-24 20:53:40 +01:00
Pablo de Lara
912b3a0acb examples/l2fwd-crypto: fix command line help
Previous cdev parameter was changed to cdev_type,
to select a crypto device type preference (HW/SW/ANY),
instead of the device itself (QAT/AESNI...).
Also deleted cdev duplicated parameter from the help.

Fixes: 27cf2d1b18e1 ("examples/l2fwd-crypto: discover capabilities")

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Acked-by: Fiona Trahe <fiona.trahe@intel.com>
2016-03-24 20:53:40 +01:00
Jan Viktorin
f057dc5c7d eal/arm: disable NEON for 32-bit memcpy
The new flag CONFIG_RTE_ARCH_ARM_NEON_MEMCPY is used to enable memcpy
optimizations in EAL.
As it is not always the performance benefit, the feature is disabled.

Signed-off-by: Jan Viktorin <viktorin@rehivetech.com>
2016-03-24 17:46:58 +01:00
Jan Viktorin
4475b3babc mk: improve ARM NEON detection
The __ARM_NEON declares that the arm_neon.h is available
which is not always true for the __ARM_NEON_FP.

 $ arm-linux-gnueabi-gcc -dM -E - < /dev/null  | grep "_FP\|_NEON"
 #define __ARM_FP 12
 #define __ARM_NEON_FP 4
 #define __VFP_FP__ 1

 $ arm-linux-gnueabi-gcc -mfpu=neon -dM -E - < /dev/null  | grep "_FP\|_NEON"
 #define __ARM_FP 12
 #define __ARM_NEON_FP 4
 #define __ARM_NEON__ 1
 #define __VFP_FP__ 1
 #define __ARM_NEON 1

 $ aarch64-linux-gnu-gcc -dM -E - < /dev/null | grep "NEON\|FP"
 #define __FP_FAST_FMAF 1
 #define __ARM_NEON 1
 #define __FP_FAST_FMA 1

 $ aarch64-thunderx-linux-gnu-gcc -dM -E - < /dev/null |grep "NEON\|FP"
 #define __ARM_FP 12
 #define __ARM_NEON_FP 12
 #define __FP_FAST_FMAF 1
 #define __ARM_NEON 1
 #define __FP_FAST_FMA 1

Signed-off-by: Jan Viktorin <viktorin@rehivetech.com>
Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
2016-03-24 17:46:58 +01:00
Jan Viktorin
3e9cf00dda config: remove ARM NEON option
ARMv7 machines have usually the NEON available.
Customization of the -mfpu=neon must be done by hand or by defining
another machine rte.vars.mk.
So, the CONFIG_RTE_ARCH_ARM_NEON is useless (and confusing).

Signed-off-by: Jan Viktorin <viktorin@rehivetech.com>
2016-03-24 17:46:58 +01:00
Stephen Hemminger
5d0c255e6b ethdev: fix xstats size query with NULL
Normal usage of rte_eth_dev_xstats_get is to call twice. The
first time the function is called with portid, xstats = NULL
and n = 0; this returns the number of entries in the statistics
table that need to be allocated.

The problem is that the routine adds a count value to NULL (0)
and assumes that this is a valid pointer (it isn't). Device drivers
all have a check for NULL, and this no longer matches.

Fixes: d4fef8b0d5e5 ("ethdev: expose generic and driver specific stats in xstats")

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Olivier Matz <olivier.matz@6wind.com>
2016-03-23 11:23:09 +01:00
Markos Chandras
a5c5b9f767 mk: fix gcc-5 version on Suse
In openSUSE Tumbleweed (and in any other SUSE distribution which
uses (or will use) gcc >= 5), gcc -dumpversion returns '5'. This is on
purpose as discussed in https://bugzilla.opensuse.org/show_bug.cgi?id=941428
As a result of which, the gcc-4.x comparison (40 against 5) does not
work leading to tons of warnings and failures during build.

This patch aims to change the way the gcc version is obtained by using
the gcc macros directly.
This is similar to what's being used in the Linux kernel. Querying the
GCC macros directly gives more accurate results compared to -dumpversion
which could vary across distributions.

Signed-off-by: Markos Chandras <mchandras@suse.de>
Acked-by: Thomas Monjalon <thomas.monjalon@6wind.com>
2016-03-23 11:00:14 +01:00
Daniel Mrzyglod
281948b475 mk: fix missing librt dependencies
For GLIBC < 2.17 it is necessery to add -lrt for linker
from glibc > 2.17 The `clock_*' suite of functions (declared in <time.h>) is now
available directly in the main C library. This affect Ubuntu 12.04 in i686
and other older Linux Distros).

Fixes: 4758404a3084 ("mk: fix eal shared library dependencies")

Signed-off-by: Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>
2016-03-22 20:46:53 +01:00
Panu Matilainen
8bc6573fb3 mk: fix missing libm dependencies
Commit e86a699cf6b1 missed two further libm dependencies: ceil() used
by librte_meter is typically inlined so the missing dependency does not
actually cause failures, and librte_pmd_nfp is not built by default
so its easy to miss.

This causes duplicates in LDLIBS in many configurations so its vital
they are removed before passing to linker.

Fixes: e86a699cf6b1 ("mk: fix shared library dependencies on libm and librt")

Reported-by: Ferruh Yigit <ferruh.yigit@intel.com>
Signed-off-by: Panu Matilainen <pmatilai@redhat.com>
Tested-by: Ferruh Yigit <ferruh.yigit@intel.com>
2016-03-22 20:42:47 +01:00
Panu Matilainen
edf4d331dc mk: eliminate duplicates from libraries list
Duplicates in LDLIBS can cause link failures from multiply defined
symbols, ensure all libraries are only mentioned once. Can't use
sorting for duplicate elimination as order is critical so awk one-liner
is used.

Signed-off-by: Panu Matilainen <pmatilai@redhat.com>
2016-03-22 20:42:47 +01:00
Thomas Monjalon
8744d7a945 mk: restrict CPU flags list
When compiling each file, the CPU flags are given as RTE_MACHINE_CPUFLAG_*
and in the list RTE_COMPILE_TIME_CPUFLAGS.

RTE_MACHINE_CPUFLAG_* are used to check the CPU features when compiling.

The list RTE_COMPILE_TIME_CPUFLAGS is used only to check the CPU at
runtime in the function rte_cpu_check_supported(). So it is not needed to
define this list for every files.
That's why RTE_COMPILE_TIME_CPUFLAGS is removed from the common variable
MACHINE_CFLAGS and is added only to the CFLAGS of eal_common_cpuflags.c.

Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>
2016-03-22 20:18:33 +01:00
Thomas Monjalon
1604ce1e60 examples/l3fwd: remove old SSE4 comments
The flag ENABLE_MULTI_BUFFER_OPTIMIZE has been removed so the
related comments are now useless.

Fixes: 268888b5b020 ("examples/l3fwd: modularize")

Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>
2016-03-22 20:18:33 +01:00
Thomas Monjalon
26ebdfff37 examples/performance-thread: fix build without SSE4.1
clang reports these errors:

error: too many arguments to function call, expected 2, have 3
	examples/performance-thread/l3fwd-thread/main.c:1220:1: note:
	'l3fwd_simple_forward' declared here

examples/l3fwd/main.c:550:1: error: unused function 'send_packetsx4'

The function is used only when ENABLE_MULTI_BUFFER_OPTIMIZE is 1.

Fixes: d48415e1fee3 ("examples/performance-thread: add l3fwd-thread app")

Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>
2016-03-22 19:22:06 +01:00
Fan Zhang
d63ef5233e examples/ip_pipeline: fix configuration parser
Fixes: 377cd98e0ab6 ("examples/ip_pipeline: add link identification")

Signed-off-by: Fan Zhang <roy.fan.zhang@intel.com>
Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
2016-03-22 19:22:06 +01:00
Tomasz Kulasek
a85ad367ac app/testpmd: fix build with icc
This patch fixes error #188: enumerated type mixed with another type,
when uint32_t is casted on enum type in icc.

Fixes: 05f1b9c82ec2 ("app/testpmd: add commands for L2 tunnel config")

Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>
2016-03-22 18:12:33 +01:00
Lazaros Koromilas
d097964616 ring: fix deadlock in zero object multi enqueue or dequeue
Issuing a zero objects dequeue with a single consumer has no effect.
Doing so with multiple consumers, can get more than one thread to succeed
the compare-and-set operation and observe starvation or even deadlock in
the while loop that checks for preceding dequeues.  The problematic piece
of code when n = 0:

    cons_next = cons_head + n;
    success = rte_atomic32_cmpset(&r->cons.head, cons_head, cons_next);

The same is possible on the enqueue path.

Fixes: af75078fece3 ("first public release")

Signed-off-by: Lazaros Koromilas <l@nofutznetworks.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>
2016-03-22 17:55:16 +01:00