Add support for restoring TCP SYN filter in SW.
Signed-off-by: Wenzhuo Lu
Signed-off-by: Wei Zhao
---
v2:
--change git log expression
---
drivers/net/ixgbe/ixgbe_ethdev.c | 18 ++
1 file changed, 18 insertions(+)
diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixg
Add support for restoring n-tuple filter in SW.
Signed-off-by: Wenzhuo Lu
Signed-off-by: Wei Zhao
---
drivers/net/ixgbe/ixgbe_ethdev.c | 131 +--
1 file changed, 83 insertions(+), 48 deletions(-)
diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ix
Add support for storing SYN filter in SW.
Signed-off-by: Wenzhuo Lu
Signed-off-by: Wei Zhao
---
v2:
--synqf assignment location change
---
drivers/net/ixgbe/ixgbe_ethdev.c | 14 +++---
drivers/net/ixgbe/ixgbe_ethdev.h | 2 ++
2 files changed, 13 insertions(+), 3 deletions(-)
diff --g
Add support for storing L2 tunnel filter in SW.
Signed-off-by: Wenzhuo Lu
Signed-off-by: Wei Zhao
---
v2:
--add a L2 tunnel initialization function in device start process
---
drivers/net/ixgbe/ixgbe_ethdev.c | 157 +++
drivers/net/ixgbe/ixgbe_ethdev.h | 24
Add support for storing flow director filter in SW.
Signed-off-by: Wenzhuo Lu
Signed-off-by: Wei Zhao
---
v2:
--add a fdir initialization function in device start process
---
drivers/net/ixgbe/ixgbe_ethdev.c | 55
drivers/net/ixgbe/ixgbe_ethdev.h | 19 ++-
drivers/ne
The patches mainly finish following functions:
1) Store and restore all kinds of filters.
2) Parse all kinds of filters.
3) Add flow validate function.
4) Add flow create function.
5) Add flow destroy function.
6) Add flow flush function.
v2 changes:
fix git log error.
Modify some function call
Hi,
> -Original Message-
> From: Yuanhan Liu [mailto:yuanhan@linux.intel.com]
> Sent: Friday, December 30, 2016 2:40 PM
> To: Tan, Jianfeng
> Cc: dev@dpdk.org; step...@networkplumber.org
> Subject: Re: [PATCH v2 8/9] examples/l3fwd: add parse-ptype option
>
> On Thu, Dec 29, 2016 at 0
> -Original Message-
> From: Yuanhan Liu [mailto:yuanhan@linux.intel.com]
> Sent: Friday, December 30, 2016 2:45 PM
> To: Tan, Jianfeng
> Cc: dev@dpdk.org; step...@networkplumber.org
> Subject: Re: [PATCH v2 9/9] examples/l3fwd-power: fix not stop and close
> device
>
> On Thu, Dec 29
On Thu, Dec 29, 2016 at 07:30:34AM +, Jianfeng Tan wrote:
> v2:
> - Add PCI queue/irq config ops.
> - Move rxq interrupt settings before sending DRIVER OK.
>
> Historically, virtio PMD can only be binded to igb_uio or
> uio_pci_generic, and not for vfio-pci. Besides, quote from
> http://dp
On Thu, Dec 29, 2016 at 07:30:43AM +, Jianfeng Tan wrote:
> As it gets killed, in SIGINT signal handler, device is not stopped
> and closed. In virtio's case, vector assignment in the KVM is not
> deassigned.
What wrong could happen then?
> This patch will invoke dev_stop() and dev_close() in
On Thu, Dec 29, 2016 at 07:30:42AM +, Jianfeng Tan wrote:
> To support those devices that do not provide packet type info when
> receiving packets, add a new option, --parse-ptype, to analyze
> packet type in the Rx callback.
I think this would be needed for all PMD drivers don't have the PTYP
On Thu, Dec 29, 2016 at 07:30:41AM +, Jianfeng Tan wrote:
> When closing virtio devices, close eventfds, free the struct to
> store queue/irq mapping.
>
> Signed-off-by: Jianfeng Tan
> ---
> drivers/net/virtio/virtio_ethdev.c | 27 ++-
> 1 file changed, 26 insertions(
On Thu, Dec 29, 2016 at 07:30:39AM +, Jianfeng Tan wrote:
> This patch mainly allocates structure to store queue/irq mapping,
> and configure queue/irq mapping down through PCI ops. It also creates
> eventfds for each Rx queue and tell the kernel about the eventfd/intr
> binding.
>
> Mostly im
On Thu, Dec 29, 2016 at 07:30:38AM +, Jianfeng Tan wrote:
> /*
> * Two types of mbuf to be cleaned:
> * 1) mbuf that has been consumed by backend but not used by virtio.
> diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
> index f0bb089..62be136 100644
> --- a/d
On Thu, Dec 29, 2016 at 07:30:37AM +, Jianfeng Tan wrote:
> Add handler in virtio_pci_ops to set queue/irq bind.
>
> Signed-off-by: Jianfeng Tan
> ---
> drivers/net/virtio/virtio_pci.c | 29 +
> drivers/net/virtio/virtio_pci.h | 5 +
> 2 files changed, 34 ins
On Thu, Dec 29, 2016 at 07:42:51AM +, Tan, Jianfeng wrote:
> Forget to mention a key part, when we bind virtio to vfio-pci driver in the
> VM, we need to insert vfio kernel module like this:
>
> $ modprobe vfio enable_unsafe_noiommu_mode=1
> $ modprobe vfio-pci
Such info should be documated
This patch adds i40e_ethertype_filter_flush function
to flush all ethertype filters, including filters in
SW and HW.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_flow.c | 41 -
1 file changed, 40 insertions(+), 1 deletion(-)
diff --git a/drivers/n
This patch adds i40e_flow_flush function to flush all
filters for users. And flow director flush function
is involved first.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.h | 1 +
drivers/net/i40e/i40e_fdir.c | 4 +---
drivers/net/i40e/i40e_flow.c | 51 +++
This patch adds i40e_tunnel_filter_flush function
to flush all tunnel filters, including filters in
SW and HW.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_flow.c | 37 +
1 file changed, 37 insertions(+)
diff --git a/drivers/net/i40e/i40e_flow.c b/dri
This patch adds i40e_dev_destroy_ethertype_filter function
to destroy a ethertype filter for users.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_flow.c | 42 ++
1 file changed, 42 insertions(+)
diff --git a/drivers/net/i40e/i40e_flow.c b/drivers/n
This patch adds i40e_flow_destroy function to destroy
a flow for users.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_flow.c | 33 +
1 file changed, 33 insertions(+)
diff --git a/drivers/net/i40e/i40e_flow.c b/drivers/net/i40e/i40e_flow.c
index 67ea83d..cd
This patch supports destroying a flow directory filter
for users.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_flow.c | 4
1 file changed, 4 insertions(+)
diff --git a/drivers/net/i40e/i40e_flow.c b/drivers/net/i40e/i40e_flow.c
index 9fc311d..e56e8b8 100644
--- a/drivers/net/i40e/i
This patch adds i40e_dev_destroy_tunnel_filter function
to destroy a tunnel filter for users.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_flow.c | 41 +
1 file changed, 41 insertions(+)
diff --git a/drivers/net/i40e/i40e_flow.c b/drivers/net/i40e
This patch adds i40e_flow_create function to create a
rule. It will check if a flow matches ethertype filter
or flow director filter or tunnel filter, if the flow
matches some kind of filter, then set the filter to HW.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.c | 9 +++--
dri
This patch adds i40e_parse_tunnel_filter to check if
a rule is a tunnel rule according to items of the flow
pattern, and the function also gets the tunnel info.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_flow.c | 394 +++
1 file changed, 394 inse
This patch adds i40e_parse_fdir_filter to check if a rule
is a flow director rule according to the flow pattern,
and the function also gets the flow director info.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.c | 56 +---
drivers/net/i40e/i40e_ethdev.h | 55
drivers/net/i40
This patch adds i40e_flow_validation function to check if
a flow is valid according to the flow pattern.
i40e_parse_ethertype_filter is added first, it also gets
the ethertype info.
i40e_flow.c is added to handle all generic filter events.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/Makefile
Currently there's no flow director filter stored in SW. This
patch stores flow director filters in SW with cuckoo hash,
also adds protection if a flow director filter has been added.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.c | 48 +++
drivers/net/i40e/i40e_et
Currently there's no tunnel filter stored in SW.
This patch stores tunnel filter in SW with cuckoo
hash, also adds protection if a tunnel filter has
been added.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.c | 169 -
drivers/net/i40e/i40e_et
Add support of restoring flow director filter.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.c | 1 +
drivers/net/i40e/i40e_ethdev.h | 1 +
drivers/net/i40e/i40e_fdir.c | 31 +++
3 files changed, 33 insertions(+)
diff --git a/drivers/net/i40e/i40e_e
Add support of restoring ethertype filter in case filter
dropped accidentally, as all filters need to be added and
removed by user obviously for generic filter API.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.c | 44 ++
1 file changed, 44 i
Add support of restoring tunnel filter.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.c | 21 +
1 file changed, 21 insertions(+)
diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 189d110..67e1b37 100644
--- a/drivers/net/i40e/i4
Currently there's no ethertype filter stored in SW.
This patch stores ethertype filter with cuckoo hash
in SW, also adds protection if an ethertype filter
has been added.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/Makefile | 1 +
drivers/net/i40e/i40e_ethdev.c | 166 +
The patch set depends on Adrien's Generic flow API(rte_flow).
The patches mainly finish following functions:
1) Store and restore all kinds of filters.
2) Parse all kinds of filters.
3) Add flow validate function.
4) Add flow create function.
5) Add flow destroy function.
6) Add flow flush functio
On Thu, Dec 29, 2016 at 10:58:11AM -0500, Charles (Chas) Williams wrote:
> On 12/29/2016 03:52 AM, Yuanhan Liu wrote:
> >On Wed, Dec 28, 2016 at 04:10:52PM -0500, Charles (Chas) Williams wrote:
> >>Start a vhost server once during devinit instead of during device start
> >>and stop. Some vhost cli
On Thu, 29 Dec 2016 20:41:21 +
"Walker, Benjamin" wrote:
> The first open question I have is whether DPDK should allow
> uio at all on recent (4.x) kernels. My current understanding
> is that there is no way to pin memory and hugepages can now
> be moved around, so uio would be unsafe. What d
Hi all,
I've been digging in to what it would take to run DPDK as an
unprivileged user and I have some findings that I thought
were worthy of discussion. The assumptions here are that I'm
using a very recent Linux kernel (4.8.15 to be specific) and
I'm using vfio with my IOMMU enabled. I'm only in
This patch provides unit tests for set of cipher/hash combinations covering
currently implemented crypto PMD's and allowing to verify scatter gather
support.
Signed-off-by: Tomasz Kulasek
---
app/test/test_cryptodev.c | 589 +++-
app/test/test_cryptodev.
Previous implementation uses EVP_EncryptUpdate() on whole source buffer
limiting its usage to the contiguous buffers.
This implementation calls EVP_EncryptUpdate() on each segment for cipher
operations in continous mode, before finalization allowing to provide
chained mbuf as a source.
However, l
This patch introduces RTE_CRYPTODEV_FF_MBUF_SCATTER_GATHER feature flag
informing that selected crypto device supports segmented mbufs natively
and doesn't need to be coalesced before crypto operation.
While using segmented buffers in crypto devices may have unpredictable
results, for PMDs which d
This patch tests rte_pktmbuf_coalesce functionality:
1) Creates banch of segmented mbufs with different size and number of
segments.
2) Generates pkt_len bytes of random data.
3) Fills noncontigouos mbuf with randomly generated data.
4) Uses rte_pktmbuf_linearize to coalesce segmented buff
This patch adds function rte_pktmbuf_linearize to let crypto PMD coalesce
chained mbuf before crypto operation and extend their capabilities to
support segmented mbufs when device cannot handle them natively.
Signed-off-by: Tomasz Kulasek
---
lib/librte_mbuf/rte_mbuf.h | 56 ++
This patch set adds support of scattered-gather list for SW PMDs.
As of now, application needs to reserve continuous block of memory for
mbufs which is not always the case. Hence needed to support chaining of
mbufs which are smaller in size but can be used if chained.
Above work involves:
a) C
This patch adds i40e_tunnel_filter_flush function
to flush all tunnel filters, including filters in
SW and HW.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_flow.c | 37 +
1 file changed, 37 insertions(+)
diff --git a/drivers/net/i40e/i40e_flow.c b/dri
This patch adds i40e_flow_flush function to flush all
filters for users. And flow director flush function
is involved first.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.h | 1 +
drivers/net/i40e/i40e_fdir.c | 4 +---
drivers/net/i40e/i40e_flow.c | 51 +++
This patch adds i40e_flow_destroy function to destroy
a flow for users.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_flow.c | 33 +
1 file changed, 33 insertions(+)
diff --git a/drivers/net/i40e/i40e_flow.c b/drivers/net/i40e/i40e_flow.c
index 8db8e0f..a6
This patch adds i40e_ethertype_filter_flush function
to flush all ethertype filters, including filters in
SW and HW.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_flow.c | 41 -
1 file changed, 40 insertions(+), 1 deletion(-)
diff --git a/drivers/n
This patch adds i40e_dev_destroy_ethertype_filter function
to destroy a ethertype filter for users.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_flow.c | 42 ++
1 file changed, 42 insertions(+)
diff --git a/drivers/net/i40e/i40e_flow.c b/drivers/n
This patch supports destroying a flow directory filter
for users.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_flow.c | 4
1 file changed, 4 insertions(+)
diff --git a/drivers/net/i40e/i40e_flow.c b/drivers/net/i40e/i40e_flow.c
index e442c5c..605ee70 100644
--- a/drivers/net/i40e/i
This patch adds i40e_parse_fdir_filter to check if a rule
is a flow director rule according to the flow pattern,
and the function also gets the flow director info.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.c | 56 +---
drivers/net/i40e/i40e_ethdev.h | 55
drivers/net/i40
This patch adds i40e_dev_destroy_tunnel_filter function
to destroy a tunnel filter for users.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_flow.c | 41 +
1 file changed, 41 insertions(+)
diff --git a/drivers/net/i40e/i40e_flow.c b/drivers/net/i40e
This patch adds i40e_flow_validation function to check if
a flow is valid according to the flow pattern.
i40e_parse_ethertype_filter is added first, it also gets
the ethertype info.
i40e_flow.c is added to handle all generic filter events.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/Makefile
This patch adds i40e_flow_create function to create a
rule. It will check if a flow matches ethertype filter
or flow director filter or tunnel filter, if the flow
matches some kind of filter, then set the filter to HW.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.c | 9 +++--
dri
This patch adds i40e_parse_tunnel_filter to check if
a rule is a tunnel rule according to items of the flow
pattern, and the function also gets the tunnel info.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_flow.c | 394 +++
1 file changed, 394 inse
Add support of restoring flow director filter.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.c | 1 +
drivers/net/i40e/i40e_ethdev.h | 1 +
drivers/net/i40e/i40e_fdir.c | 28
3 files changed, 30 insertions(+)
diff --git a/drivers/net/i40e/i40e_ethd
Add support of restoring tunnel filter.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.c | 21 +
1 file changed, 21 insertions(+)
diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 6cd8c06..0d53c4e 100644
--- a/drivers/net/i40e/i4
Add support of restoring ethertype filter in case filter
dropped accidentally, as all filters need to be added and
removed by user obviously for generic filter API.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.c | 44 ++
1 file changed, 44 i
Currently there's no ethertype filter stored in SW.
This patch stores ethertype filter with cuckoo hash
in SW, also adds protection if an ethertype filter
has been added.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/Makefile | 1 +
drivers/net/i40e/i40e_ethdev.c | 166 +
Currently there's no tunnel filter stored in SW.
This patch stores tunnel filter in SW with cuckoo
hash, also adds protection if a tunnel filter has
been added.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.c | 169 -
drivers/net/i40e/i40e_et
Currently there's no flow director filter stored in SW. This
patch stores flow director filters in SW with cuckoo hash,
also adds protection if a flow director filter has been added.
Signed-off-by: Beilei Xing
---
drivers/net/i40e/i40e_ethdev.c | 48 +++
drivers/net/i40e/i40e_et
All pathes depend on Adrien's Generic flow API(rte_flow).
The patches mainly finish following functions:
1) Store and restore all kinds of filters.
2) Parse all kinds of filters.
3) Add flow validate function.
4) Add flow create function.
5) Add flow destroy function.
6) Add flow flush function.
On 12/29/2016 03:52 AM, Yuanhan Liu wrote:
On Wed, Dec 28, 2016 at 04:10:52PM -0500, Charles (Chas) Williams wrote:
Start a vhost server once during devinit instead of during device start
and stop. Some vhost clients, QEMU, don't re-attaching to sockets when
the vhost server is stopped and late
Hi Olivier,
> -Original Message-
> From: Olivier Matz [mailto:olivier.m...@6wind.com]
> Sent: Friday, December 16, 2016 11:06
> To: Kulasek, TomaszX
> Cc: dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH 1/4] rte_mbuf: add rte_pktmbuf_coalesce
>
> Hi Tomasz,
>
> On Fri, 2 Dec 2016 18:07:4
On 12/29/2016 03:51 AM, Yuanhan Liu wrote:
On Wed, Dec 28, 2016 at 04:10:51PM -0500, Charles (Chas) Williams wrote:
From: Wen Chiu
Only increment and decrement nb_started_ports on the first and last
device start and stop. Otherwise, nb_started_ports can become negative
if a device is stopped
Signed-off-by: Nelio Laranjeiro
Acked-by: Adrien Mazarguil
---
drivers/net/mlx5/mlx5_flow.c | 78
1 file changed, 72 insertions(+), 6 deletions(-)
diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 8f2f4d5..093c140 100644
This commits adds:
- Type of service
- Next protocol ID
Signed-off-by: Nelio Laranjeiro
Acked-by: Adrien Mazarguil
---
drivers/net/mlx5/mlx5_flow.c | 40
1 file changed, 32 insertions(+), 8 deletions(-)
diff --git a/drivers/net/mlx5/mlx5_flow.c b/driver
Signed-off-by: Nelio Laranjeiro
Acked-by: Adrien Mazarguil
---
drivers/net/mlx5/mlx5_flow.c | 78
drivers/net/mlx5/mlx5_prm.h | 70 ++-
drivers/net/mlx5/mlx5_rxtx.c | 12 ++-
drivers/net/mlx5/mlx5_rxtx.h | 3 +
Signed-off-by: Nelio Laranjeiro
Acked-by: Adrien Mazarguil
---
drivers/net/mlx5/mlx5_flow.c | 62 +++-
1 file changed, 61 insertions(+), 1 deletion(-)
diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 4f6696e..8f2f4d5 100644
-
Introduce initial software for rte_flow rules.
VLAN, VXLAN are still not supported.
Signed-off-by: Nelio Laranjeiro
Acked-by: Adrien Mazarguil
---
drivers/net/mlx5/mlx5.h | 3 +
drivers/net/mlx5/mlx5_flow.c| 954 ++--
drivers/net/mlx5/mlx5_trig
Signed-off-by: Nelio Laranjeiro
Acked-by: Adrien Mazarguil
---
drivers/net/mlx5/Makefile| 1 +
drivers/net/mlx5/mlx5.h | 16 ++
drivers/net/mlx5/mlx5_fdir.c | 15 ++
drivers/net/mlx5/mlx5_flow.c | 124 +++
4 files changed, 156 insertio
Changes in v5:
- Fix masking when only spec is present in item structure.
- Fix first element of flow items array.
Changes in v4:
- Simplify flow parsing by using a graph.
- Add VXLAN flow item.
- Add mark flow action.
- Extend IPv4 filter item (Type of service, Next Protocol ID).
Changes
> Subject: [dpdk-dev] [PATCH v2 2/3] crypto/aesni_gcm: fix iv size in PMD
> capabilities
>
> This patch sets iv size in aesni gcm PMD to 12 bytes to be conformant with
> nist SP800-38D.
>
> Fixes: eec136f3c54f ("aesni_gcm: add driver for AES-GCM crypto
> operations")
>
> Signed-off-by: Arek Kusz
Hi Arek,
> -Original Message-
> From: dev [mailto:dev-boun...@dpdk.org] On Behalf Of Arek Kusztal
> Sent: Friday, December 23, 2016 9:25 AM
> To: dev@dpdk.org
> Cc: Trahe, Fiona ; De Lara Guarch, Pablo
> ; Griffin, John ;
> Jain, Deepak K ; Doherty, Declan
> ; Kusztal, ArkadiuszX
>
> Subj
Hi Yuanhan,
On 12/26/2016 3:57 PM, Yuanhan Liu wrote:
On Mon, Dec 26, 2016 at 06:58:58AM +, Tan, Jianfeng wrote:
-Original Message-
From: Yuanhan Liu [mailto:yuanhan@linux.intel.com]
Sent: Monday, December 26, 2016 2:28 PM
To: Tan, Jianfeng
Cc: dev@dpdk.org; Yigit, Ferruh; Li
On Wed, Dec 28, 2016 at 04:10:52PM -0500, Charles (Chas) Williams wrote:
> Start a vhost server once during devinit instead of during device start
> and stop. Some vhost clients, QEMU, don't re-attaching to sockets when
> the vhost server is stopped and later started. Preserve existing behavior
>
On Wed, Dec 28, 2016 at 04:10:51PM -0500, Charles (Chas) Williams wrote:
> From: Wen Chiu
>
> Only increment and decrement nb_started_ports on the first and last
> device start and stop. Otherwise, nb_started_ports can become negative
> if a device is stopped multiple times.
How could you be ab
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