[ovs-dev,v2,1/4] netdev-dpdk: fix mempool management with vhu client.

From: Antonio Fischetti <antonio.fischetti@intel.com>

In a PVP test where vhostuser ports are configured as
clients, OvS crashes when QEMU is launched.
This patch avoids the repeated calls to netdev_change_seq_changed
after the requested mempool is already acquired.

CC: Kevin Traynor <ktraynor@redhat.com>
CC: Aaron Conole <aconole@redhat.com>
Reported-by: Ciara Loftus <ciara.loftus@intel.com>
Fixes: d555d9bded5f ("netdev-dpdk: Create separate memory pool for each port.")
Signed-off-by: Antonio Fischetti <antonio.fischetti@intel.com>
---
To replicate the bug scenario:

 PVP test setup
 --------------
CLIENT_SOCK_DIR=/tmp
SOCK0=dpdkvhostuser0
SOCK1=dpdkvhostuser1

1 PMD
Add 2 dpdk ports, n_rxq=1
Add 2 vhu ports both of type dpdkvhostuserclient and specify vhost-server-path
 ovs-vsctl set Interface dpdkvhostuser0 options:vhost-server-path="$CLIENT_SOCK_DIR/$SOCK0"
 ovs-vsctl set Interface dpdkvhostuser1 options:vhost-server-path="$CLIENT_SOCK_DIR/$SOCK1"

Set port-based rules: dpdk0 <--> vhu0 and dpdk1 <--> vhu1
 add-flow br0 in_port=1,action=output:3
 add-flow br0 in_port=3,action=output:1
 add-flow br0 in_port=4,action=output:2
 add-flow br0 in_port=2,action=output:4

 Launch QEMU
 -----------
As OvS vhu ports are acting as clients, we must specify 'server' in the next command.
VM_IMAGE=<path/to/your/vm/image>

 sudo -E taskset 0x3F00 $QEMU_DIR/x86_64-softmmu/qemu-system-x86_64 -name us-vhost-vm1 -cpu host -enable-kvm -m 4096M -object memory-backend-file,id=mem,size=4096M,mem-path=/dev/hugepages,share=on -numa node,memdev=mem -mem-prealloc -smp 4 -drive file=$VM_IMAGE -chardev socket,id=char0,path=$CLIENT_SOCK_DIR/$SOCK0,server -netdev type=vhost-user,id=mynet1,chardev=char0,vhostforce -device virtio-net-pci,mac=00:00:00:00:00:01,netdev=mynet1,mrg_rxbuf=off -chardev socket,id=char1,path=$CLIENT_SOCK_DIR/$SOCK1,server -netdev type=vhost-user,id=mynet2,chardev=char1,vhostforce -device virtio-net-pci,mac=00:00:00:00:00:02,netdev=mynet2,mrg_rxbuf=off --nographic

 Expected behavior
 -----------------
With this fix OvS shouldn't crash.
---
 lib/netdev-dpdk.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

On 09/28/2017 03:28 PM, antonio.fischetti@intel.com wrote:
> From: Antonio Fischetti <antonio.fischetti@intel.com>
> 
> In a PVP test where vhostuser ports are configured as
> clients, OvS crashes when QEMU is launched.
> This patch avoids the repeated calls to netdev_change_seq_changed
> after the requested mempool is already acquired.
> 

Can you explain what is happening in this bug? I can't reproduce it and
the mempool for vhost ports should only be reconfigured if the number of
queues or socket has changed.

> CC: Kevin Traynor <ktraynor@redhat.com>
> CC: Aaron Conole <aconole@redhat.com>
> Reported-by: Ciara Loftus <ciara.loftus@intel.com>
> Fixes: d555d9bded5f ("netdev-dpdk: Create separate memory pool for each port.")
> Signed-off-by: Antonio Fischetti <antonio.fischetti@intel.com>
> ---
> To replicate the bug scenario:
> 
>  PVP test setup
>  --------------
> CLIENT_SOCK_DIR=/tmp
> SOCK0=dpdkvhostuser0
> SOCK1=dpdkvhostuser1
> 
> 1 PMD
> Add 2 dpdk ports, n_rxq=1
> Add 2 vhu ports both of type dpdkvhostuserclient and specify vhost-server-path
>  ovs-vsctl set Interface dpdkvhostuser0 options:vhost-server-path="$CLIENT_SOCK_DIR/$SOCK0"
>  ovs-vsctl set Interface dpdkvhostuser1 options:vhost-server-path="$CLIENT_SOCK_DIR/$SOCK1"
> 
> Set port-based rules: dpdk0 <--> vhu0 and dpdk1 <--> vhu1
>  add-flow br0 in_port=1,action=output:3
>  add-flow br0 in_port=3,action=output:1
>  add-flow br0 in_port=4,action=output:2
>  add-flow br0 in_port=2,action=output:4
> 
>  Launch QEMU
>  -----------
> As OvS vhu ports are acting as clients, we must specify 'server' in the next command.
> VM_IMAGE=<path/to/your/vm/image>
> 
>  sudo -E taskset 0x3F00 $QEMU_DIR/x86_64-softmmu/qemu-system-x86_64 -name us-vhost-vm1 -cpu host -enable-kvm -m 4096M -object memory-backend-file,id=mem,size=4096M,mem-path=/dev/hugepages,share=on -numa node,memdev=mem -mem-prealloc -smp 4 -drive file=$VM_IMAGE -chardev socket,id=char0,path=$CLIENT_SOCK_DIR/$SOCK0,server -netdev type=vhost-user,id=mynet1,chardev=char0,vhostforce -device virtio-net-pci,mac=00:00:00:00:00:01,netdev=mynet1,mrg_rxbuf=off -chardev socket,id=char1,path=$CLIENT_SOCK_DIR/$SOCK1,server -netdev type=vhost-user,id=mynet2,chardev=char1,vhostforce -device virtio-net-pci,mac=00:00:00:00:00:02,netdev=mynet2,mrg_rxbuf=off --nographic
> 
>  Expected behavior
>  -----------------
> With this fix OvS shouldn't crash.
> ---
>  lib/netdev-dpdk.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
> index c60f46f..dda3771 100644
> --- a/lib/netdev-dpdk.c
> +++ b/lib/netdev-dpdk.c
> @@ -621,6 +621,10 @@ netdev_dpdk_mempool_configure(struct netdev_dpdk *dev)
>      uint32_t buf_size = dpdk_buf_size(dev->requested_mtu);
>      struct dpdk_mp *mp;
>  
> +    if (dev->requested_socket_id == dev->socket_id
> +        && dev->requested_mtu == dev->mtu) {
> +        return EEXIST;
> +    }

But you would want to get a new mempool if the number of queues have
changed, as that is part of the calculation for the size of the mempool.
MIN_NB_MBUF was added to over provision as a safety so you'd probably
get away with it but you should be requesting a new mempool with the
correctly calculated num of mbufs.

It seems like this code is trying to add back in the code to prevent
rte_pktmbuf_pool_create being called again for the same values. In the
patchset that this fixes it is removed and the EEXISTS return from
rte_pktmbuf_pool_create are handled instead. I'm not sure that both
mechanisms are needed.

>      mp = dpdk_mp_get(dev, FRAME_LEN_TO_MTU(buf_size));
>      if (!mp) {
>          VLOG_ERR("Failed to create memory pool for netdev "
> @@ -3207,7 +3211,7 @@ netdev_dpdk_reconfigure(struct netdev *netdev)
>      rte_eth_dev_stop(dev->port_id);
>  
>      err = netdev_dpdk_mempool_configure(dev);
> -    if (err) {
> +    if (err && err != EEXIST) {
>          goto out;
>      }
>  
> @@ -3247,10 +3251,10 @@ dpdk_vhost_reconfigure_helper(struct netdev_dpdk *dev)
>      netdev_dpdk_remap_txqs(dev);
>  
>      err = netdev_dpdk_mempool_configure(dev);
> -    if (err) {
> -        return err;
> -    } else {
> +    if (!err) {
>          netdev_change_seq_changed(&dev->up);
> +    } else if (err != EEXIST){
> +        return err;
>      }
>  
>      if (netdev_dpdk_get_vid(dev) >= 0) {
>

Thanks Kevin for your feedback.
Below some details on what happens, how to replicate the issue and 
some comments inline.

-Antonio

> -----Original Message-----
> From: Kevin Traynor [mailto:ktraynor@redhat.com]
> Sent: Monday, October 2, 2017 6:38 PM
> To: Fischetti, Antonio <antonio.fischetti@intel.com>; dev@openvswitch.org
> Cc: Aaron Conole <aconole@redhat.com>
> Subject: Re: [PATCH v2 1/4] netdev-dpdk: fix mempool management with vhu
> client.
> 
> On 09/28/2017 03:28 PM, antonio.fischetti@intel.com wrote:
> > From: Antonio Fischetti <antonio.fischetti@intel.com>
> >
> > In a PVP test where vhostuser ports are configured as
> > clients, OvS crashes when QEMU is launched.
> > This patch avoids the repeated calls to netdev_change_seq_changed
> > after the requested mempool is already acquired.
> >
> 
> Can you explain what is happening in this bug? I can't reproduce it 

[Antonio]
When QEMU is being launched, ovs crashes with the following stacktrace:
https://mail.openvswitch.org/pipermail/ovs-dev/2017-September/339343.html

In case the requested mempool already exists, netdev_dpdk_mempool_configure
returns 0 => netdev_change_seq_changed is called.

The issue happens with vhostuser 'client' ports:
 - the vhu ports must be of dpdkvhostuserclient type
 - so the QEMU command must contain 'server' like
   qemu-system-x86_64 .... path=$CLIENT_SOCK_DIR/$SOCK0,server

Below other details on my setup.

  1 PMD
  -----
ovs-vsctl --no-wait set Open_vSwitch . other_config:pmd-cpu-mask=8

  Ports
  -----
ovs-vsctl add-port br0 dpdk0 -- set Interface dpdk0 type=dpdk options:dpdk-devargs=$NIC0
ovs-vsctl add-port br0 dpdk0 -- set Interface dpdk1 type=dpdk options:dpdk-devargs=$NIC1

ovs-vsctl add-port br0 dpdkvhostuser0 -- set Interface dpdkvhostuser0 type=dpdkvhostuserclient
ovs-vsctl set Interface dpdkvhostuser0 options:vhost-server-path="/tmp/dpdkvhostuser0"

ovs-vsctl add-port br0 dpdkvhostuser1 -- set Interface dpdkvhostuser1 type=dpdkvhostuserclient
ovs-vsctl set Interface dpdkvhostuser1 options:vhost-server-path="/tmp/dpdkvhostuser1"


I'm using DPDK v17.05 and QEMU v2.7.0.


Other details are below right after the patch description.



> and
> the mempool for vhost ports should only be reconfigured if the number of
> queues or socket has changed.
> 
> > CC: Kevin Traynor <ktraynor@redhat.com>
> > CC: Aaron Conole <aconole@redhat.com>
> > Reported-by: Ciara Loftus <ciara.loftus@intel.com>
> > Fixes: d555d9bded5f ("netdev-dpdk: Create separate memory pool for each
> port.")
> > Signed-off-by: Antonio Fischetti <antonio.fischetti@intel.com>
> > ---
> > To replicate the bug scenario:
> >
> >  PVP test setup
> >  --------------
> > CLIENT_SOCK_DIR=/tmp
> > SOCK0=dpdkvhostuser0
> > SOCK1=dpdkvhostuser1
> >
> > 1 PMD
> > Add 2 dpdk ports, n_rxq=1
> > Add 2 vhu ports both of type dpdkvhostuserclient and specify vhost-server-
> path
> >  ovs-vsctl set Interface dpdkvhostuser0 options:vhost-server-
> path="$CLIENT_SOCK_DIR/$SOCK0"
> >  ovs-vsctl set Interface dpdkvhostuser1 options:vhost-server-
> path="$CLIENT_SOCK_DIR/$SOCK1"
> >
> > Set port-based rules: dpdk0 <--> vhu0 and dpdk1 <--> vhu1
> >  add-flow br0 in_port=1,action=output:3
> >  add-flow br0 in_port=3,action=output:1
> >  add-flow br0 in_port=4,action=output:2
> >  add-flow br0 in_port=2,action=output:4
> >
> >  Launch QEMU
> >  -----------
> > As OvS vhu ports are acting as clients, we must specify 'server' in the next
> command.
> > VM_IMAGE=<path/to/your/vm/image>
> >
> >  sudo -E taskset 0x3F00 $QEMU_DIR/x86_64-softmmu/qemu-system-x86_64 -name us-
> vhost-vm1 -cpu host -enable-kvm -m 4096M -object memory-backend-
> file,id=mem,size=4096M,mem-path=/dev/hugepages,share=on -numa node,memdev=mem -
> mem-prealloc -smp 4 -drive file=$VM_IMAGE -chardev
> socket,id=char0,path=$CLIENT_SOCK_DIR/$SOCK0,server -netdev type=vhost-
> user,id=mynet1,chardev=char0,vhostforce -device virtio-net-
> pci,mac=00:00:00:00:00:01,netdev=mynet1,mrg_rxbuf=off -chardev
> socket,id=char1,path=$CLIENT_SOCK_DIR/$SOCK1,server -netdev type=vhost-
> user,id=mynet2,chardev=char1,vhostforce -device virtio-net-
> pci,mac=00:00:00:00:00:02,netdev=mynet2,mrg_rxbuf=off --nographic
> >
> >  Expected behavior
> >  -----------------
> > With this fix OvS shouldn't crash.
> > ---
> >  lib/netdev-dpdk.c | 12 ++++++++----
> >  1 file changed, 8 insertions(+), 4 deletions(-)
> >
> > diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
> > index c60f46f..dda3771 100644
> > --- a/lib/netdev-dpdk.c
> > +++ b/lib/netdev-dpdk.c
> > @@ -621,6 +621,10 @@ netdev_dpdk_mempool_configure(struct netdev_dpdk *dev)
> >      uint32_t buf_size = dpdk_buf_size(dev->requested_mtu);
> >      struct dpdk_mp *mp;
> >
> > +    if (dev->requested_socket_id == dev->socket_id
> > +        && dev->requested_mtu == dev->mtu) {
> > +        return EEXIST;
> > +    }
> 
> But you would want to get a new mempool if the number of queues have
> changed, as that is part of the calculation for the size of the mempool.
> MIN_NB_MBUF was added to over provision as a safety so you'd probably
> get away with it but you should be requesting a new mempool with the
> correctly calculated num of mbufs.

[Antonio] I get your point, if the nr of queues has changed, then
socket and mtu are unchanged. But a new nr of mbuf must be computed
to accommodate packets for the different queues. That affects the
mp name too. So we do need to call dpdk_mp_create to create a new
mp.


> 
> It seems like this code is trying to add back in the code to prevent
> rte_pktmbuf_pool_create being called again for the same values. In the
> patchset that this fixes it is removed and the EEXISTS return from
> rte_pktmbuf_pool_create are handled instead. I'm not sure that both
> mechanisms are needed.

[Antonio] I'll try to rework by managing the EEXIST case only.

> 
> >      mp = dpdk_mp_get(dev, FRAME_LEN_TO_MTU(buf_size));
> >      if (!mp) {
> >          VLOG_ERR("Failed to create memory pool for netdev "
> > @@ -3207,7 +3211,7 @@ netdev_dpdk_reconfigure(struct netdev *netdev)
> >      rte_eth_dev_stop(dev->port_id);
> >
> >      err = netdev_dpdk_mempool_configure(dev);
> > -    if (err) {
> > +    if (err && err != EEXIST) {
> >          goto out;
> >      }
> >
> > @@ -3247,10 +3251,10 @@ dpdk_vhost_reconfigure_helper(struct netdev_dpdk
> *dev)
> >      netdev_dpdk_remap_txqs(dev);
> >
> >      err = netdev_dpdk_mempool_configure(dev);
> > -    if (err) {
> > -        return err;
> > -    } else {
> > +    if (!err) {
> >          netdev_change_seq_changed(&dev->up);
> > +    } else if (err != EEXIST){
> > +        return err;
> >      }
> >
> >      if (netdev_dpdk_get_vid(dev) >= 0) {
> >

I'll rework this patch and post a V3.

Thanks,
Antonio

> -----Original Message-----
> From: ovs-dev-bounces@openvswitch.org [mailto:ovs-dev-bounces@openvswitch.org]
> On Behalf Of Fischetti, Antonio
> Sent: Tuesday, October 3, 2017 4:25 PM
> To: Kevin Traynor <ktraynor@redhat.com>; dev@openvswitch.org
> Subject: Re: [ovs-dev] [PATCH v2 1/4] netdev-dpdk: fix mempool management with
> vhu client.
> 
> Thanks Kevin for your feedback.
> Below some details on what happens, how to replicate the issue and
> some comments inline.
> 
> -Antonio
> 
> > -----Original Message-----
> > From: Kevin Traynor [mailto:ktraynor@redhat.com]
> > Sent: Monday, October 2, 2017 6:38 PM
> > To: Fischetti, Antonio <antonio.fischetti@intel.com>; dev@openvswitch.org
> > Cc: Aaron Conole <aconole@redhat.com>
> > Subject: Re: [PATCH v2 1/4] netdev-dpdk: fix mempool management with vhu
> > client.
> >
> > On 09/28/2017 03:28 PM, antonio.fischetti@intel.com wrote:
> > > From: Antonio Fischetti <antonio.fischetti@intel.com>
> > >
> > > In a PVP test where vhostuser ports are configured as
> > > clients, OvS crashes when QEMU is launched.
> > > This patch avoids the repeated calls to netdev_change_seq_changed
> > > after the requested mempool is already acquired.
> > >
> >
> > Can you explain what is happening in this bug? I can't reproduce it
> 
> [Antonio]
> When QEMU is being launched, ovs crashes with the following stacktrace:
> https://mail.openvswitch.org/pipermail/ovs-dev/2017-September/339343.html
> 
> In case the requested mempool already exists, netdev_dpdk_mempool_configure
> returns 0 => netdev_change_seq_changed is called.
> 
> The issue happens with vhostuser 'client' ports:
>  - the vhu ports must be of dpdkvhostuserclient type
>  - so the QEMU command must contain 'server' like
>    qemu-system-x86_64 .... path=$CLIENT_SOCK_DIR/$SOCK0,server
> 
> Below other details on my setup.
> 
>   1 PMD
>   -----
> ovs-vsctl --no-wait set Open_vSwitch . other_config:pmd-cpu-mask=8
> 
>   Ports
>   -----
> ovs-vsctl add-port br0 dpdk0 -- set Interface dpdk0 type=dpdk options:dpdk-
> devargs=$NIC0
> ovs-vsctl add-port br0 dpdk0 -- set Interface dpdk1 type=dpdk options:dpdk-
> devargs=$NIC1
> 
> ovs-vsctl add-port br0 dpdkvhostuser0 -- set Interface dpdkvhostuser0
> type=dpdkvhostuserclient
> ovs-vsctl set Interface dpdkvhostuser0 options:vhost-server-
> path="/tmp/dpdkvhostuser0"
> 
> ovs-vsctl add-port br0 dpdkvhostuser1 -- set Interface dpdkvhostuser1
> type=dpdkvhostuserclient
> ovs-vsctl set Interface dpdkvhostuser1 options:vhost-server-
> path="/tmp/dpdkvhostuser1"
> 
> 
> I'm using DPDK v17.05 and QEMU v2.7.0.
> 
> 
> Other details are below right after the patch description.
> 
> 
> 
> > and
> > the mempool for vhost ports should only be reconfigured if the number of
> > queues or socket has changed.
> >
> > > CC: Kevin Traynor <ktraynor@redhat.com>
> > > CC: Aaron Conole <aconole@redhat.com>
> > > Reported-by: Ciara Loftus <ciara.loftus@intel.com>
> > > Fixes: d555d9bded5f ("netdev-dpdk: Create separate memory pool for each
> > port.")
> > > Signed-off-by: Antonio Fischetti <antonio.fischetti@intel.com>
> > > ---
> > > To replicate the bug scenario:
> > >
> > >  PVP test setup
> > >  --------------
> > > CLIENT_SOCK_DIR=/tmp
> > > SOCK0=dpdkvhostuser0
> > > SOCK1=dpdkvhostuser1
> > >
> > > 1 PMD
> > > Add 2 dpdk ports, n_rxq=1
> > > Add 2 vhu ports both of type dpdkvhostuserclient and specify vhost-server-
> > path
> > >  ovs-vsctl set Interface dpdkvhostuser0 options:vhost-server-
> > path="$CLIENT_SOCK_DIR/$SOCK0"
> > >  ovs-vsctl set Interface dpdkvhostuser1 options:vhost-server-
> > path="$CLIENT_SOCK_DIR/$SOCK1"
> > >
> > > Set port-based rules: dpdk0 <--> vhu0 and dpdk1 <--> vhu1
> > >  add-flow br0 in_port=1,action=output:3
> > >  add-flow br0 in_port=3,action=output:1
> > >  add-flow br0 in_port=4,action=output:2
> > >  add-flow br0 in_port=2,action=output:4
> > >
> > >  Launch QEMU
> > >  -----------
> > > As OvS vhu ports are acting as clients, we must specify 'server' in the
> next
> > command.
> > > VM_IMAGE=<path/to/your/vm/image>
> > >
> > >  sudo -E taskset 0x3F00 $QEMU_DIR/x86_64-softmmu/qemu-system-x86_64 -name
> us-
> > vhost-vm1 -cpu host -enable-kvm -m 4096M -object memory-backend-
> > file,id=mem,size=4096M,mem-path=/dev/hugepages,share=on -numa node,memdev=mem
> -
> > mem-prealloc -smp 4 -drive file=$VM_IMAGE -chardev
> > socket,id=char0,path=$CLIENT_SOCK_DIR/$SOCK0,server -netdev type=vhost-
> > user,id=mynet1,chardev=char0,vhostforce -device virtio-net-
> > pci,mac=00:00:00:00:00:01,netdev=mynet1,mrg_rxbuf=off -chardev
> > socket,id=char1,path=$CLIENT_SOCK_DIR/$SOCK1,server -netdev type=vhost-
> > user,id=mynet2,chardev=char1,vhostforce -device virtio-net-
> > pci,mac=00:00:00:00:00:02,netdev=mynet2,mrg_rxbuf=off --nographic
> > >
> > >  Expected behavior
> > >  -----------------
> > > With this fix OvS shouldn't crash.
> > > ---
> > >  lib/netdev-dpdk.c | 12 ++++++++----
> > >  1 file changed, 8 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
> > > index c60f46f..dda3771 100644
> > > --- a/lib/netdev-dpdk.c
> > > +++ b/lib/netdev-dpdk.c
> > > @@ -621,6 +621,10 @@ netdev_dpdk_mempool_configure(struct netdev_dpdk *dev)
> > >      uint32_t buf_size = dpdk_buf_size(dev->requested_mtu);
> > >      struct dpdk_mp *mp;
> > >
> > > +    if (dev->requested_socket_id == dev->socket_id
> > > +        && dev->requested_mtu == dev->mtu) {
> > > +        return EEXIST;
> > > +    }
> >
> > But you would want to get a new mempool if the number of queues have
> > changed, as that is part of the calculation for the size of the mempool.
> > MIN_NB_MBUF was added to over provision as a safety so you'd probably
> > get away with it but you should be requesting a new mempool with the
> > correctly calculated num of mbufs.
> 
> [Antonio] I get your point, if the nr of queues has changed, then
> socket and mtu are unchanged. But a new nr of mbuf must be computed
> to accommodate packets for the different queues. That affects the
> mp name too. So we do need to call dpdk_mp_create to create a new
> mp.
> 
> 
> >
> > It seems like this code is trying to add back in the code to prevent
> > rte_pktmbuf_pool_create being called again for the same values. In the
> > patchset that this fixes it is removed and the EEXISTS return from
> > rte_pktmbuf_pool_create are handled instead. I'm not sure that both
> > mechanisms are needed.
> 
> [Antonio] I'll try to rework by managing the EEXIST case only.
> 
> >
> > >      mp = dpdk_mp_get(dev, FRAME_LEN_TO_MTU(buf_size));
> > >      if (!mp) {
> > >          VLOG_ERR("Failed to create memory pool for netdev "
> > > @@ -3207,7 +3211,7 @@ netdev_dpdk_reconfigure(struct netdev *netdev)
> > >      rte_eth_dev_stop(dev->port_id);
> > >
> > >      err = netdev_dpdk_mempool_configure(dev);
> > > -    if (err) {
> > > +    if (err && err != EEXIST) {
> > >          goto out;
> > >      }
> > >
> > > @@ -3247,10 +3251,10 @@ dpdk_vhost_reconfigure_helper(struct netdev_dpdk
> > *dev)
> > >      netdev_dpdk_remap_txqs(dev);
> > >
> > >      err = netdev_dpdk_mempool_configure(dev);
> > > -    if (err) {
> > > -        return err;
> > > -    } else {
> > > +    if (!err) {
> > >          netdev_change_seq_changed(&dev->up);
> > > +    } else if (err != EEXIST){
> > > +        return err;
> > >      }
> > >
> > >      if (netdev_dpdk_get_vid(dev) >= 0) {
> > >
> 
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