[PATCH v11 0/3] Fix cmdline_poll and testpmd signal handling

[Ling, WeiX]

> -----Original Message-----
> From: Stephen Hemminger <stephen at networkplumber.org>
> Sent: Monday, March 13, 2023 11:53 PM
> To: Ling, WeiX <weix.ling at intel.com>
> Cc: Tal Shnaiderman <talshn at nvidia.com>; NBU-Contact-Thomas Monjalon
> (EXTERNAL) <thomas at monjalon.net>; Pier Damouny
> <pdamouny at nvidia.com>; dev at dpdk.org; stable at dpdk.org;
> ferruh.yigit at amd.com; Singh, Aman Deep <aman.deep.singh at intel.com>;
> Zhang, Yuying <yuying.zhang at intel.com>; Raslan Darawsheh
> <rasland at nvidia.com>
> Subject: Re: [PATCH v11 0/3] Fix cmdline_poll and testpmd signal handling
> 
> On Mon, 13 Mar 2023 10:34:55 +0000
> "Ling, WeiX" <weix.ling at intel.com> wrote:
> 
> > > -----Original Message-----
> > > From: Tal Shnaiderman <talshn at nvidia.com>
> > > Sent: Monday, March 13, 2023 1:18 AM
> > > To: NBU-Contact-Thomas Monjalon (EXTERNAL)
> <thomas at monjalon.net>;
> > > Stephen Hemminger <stephen at networkplumber.org>; Pier Damouny
> > > <pdamouny at nvidia.com>
> > > Cc: dev at dpdk.org; stable at dpdk.org; ferruh.yigit at amd.com; Singh,
> Aman
> > > Deep <aman.deep.singh at intel.com>; Zhang, Yuying
> > > <yuying.zhang at intel.com>; Raslan Darawsheh <rasland at nvidia.com>
> > > Subject: RE: [PATCH v11 0/3] Fix cmdline_poll and testpmd signal
> > > handling
> > >
> > > > Subject: Re: [PATCH v11 0/3] Fix cmdline_poll and testpmd signal
> > > > handling
> > > >
> > > > External email: Use caution opening links or attachments
> > > >
> > > >
> > > > 19/02/2023 18:53, Stephen Hemminger:
> > > > > On Fri,  3 Feb 2023 11:14:06 -0800 Stephen Hemminger
> > > > > <stephen at networkplumber.org> wrote:
> > > > >
> > > > > > This patchset keeps uncovering bad practices in the cmdline
> > > > > > library around end of file and signal handling.
> > > > > >
> > > > > > Stephen Hemminger (3):
> > > > > >   cmdline: make rdline status not private
> > > > > >   cmdline: handle EOF in cmdline_poll
> > > > > >   testpmd: cleanup cleanly from signal
> > > > > >
> > > > > >  app/test-pmd/cmdline.c        | 29 +++++--------
> > > > > >  app/test-pmd/testpmd.c        | 77 ++++++++++++++++---------------
> ----
> > > > > >  app/test-pmd/testpmd.h        |  1 +
> > > > > >  lib/cmdline/cmdline.c         | 11 +++--
> > > > > >  lib/cmdline/cmdline.h         |  6 +++
> > > > > >  lib/cmdline/cmdline_private.h |  6 ---
> > > > > >  6 files changed, 62 insertions(+), 68 deletions(-)
> > > > > >
> > > > >
> > > > > Could this please be merged for 23.03?
> > > > > There are Ack's.
> > > > > The only CI failure is a bogus performance test failure.
> > > >
> > > > There was no review from testpmd maintainers.
> > > >
> > > > I've added Cc: stable at dpdk.org.
> > > > Applied, thanks.
> > > >
> > > Hi,
> > >
> > > Commit "testpmd: cleanup cleanly from signal" from this series
> > > breaks TestPMD's interactive mode on Windows.
> > >
> > > See https://bugs.dpdk.org/show_bug.cgi?id=1180
> >
> > Hi Stephen,
> >
> > I found an issue based this commit(0fd1386c: app/testpmd: cleanup cleanly
> from signal).
> >
> > The packets can't loop in 2 testpmd after start dpdk-pdump to capture
> packets Immediately (less than 1 second).
> >
> > Steps:
> >
> > 1. Bind 1 CBDMA channel to vfio-pci, then start vhost-user as back-end:
> >
> > x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 28-36 -n 4 -a 0000:80:04.0
> --file-prefix=vhost   \
> > --vdev 'eth_vhost0,iface=vhost-net0,queues=8,client=1,\
> >
> dmas=[txq0 at 0000:80:04.0;txq1 at 0000:80:04.0;txq2 at 0000:80:04.0;txq3 at 000
> 0:80:04.0;txq4 at 0000:80:04.0;txq5 at 0000:80:04.0;rxq2 at 0000:80:04.0;rxq3 at 00
> 00:80:04.0;rxq4 at 0000:80:04.0;rxq5 at 0000:80:04.0;rxq6 at 0000:80:04.0;rxq7 at 0
> 000:80:04.0]'
> > --iova=va -- -i --nb-cores=4 --rxq=8 --txq=8 --txd=1024 --rxd=1024
> >
> > 2. Start virtio-user as front-end:
> >
> > x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 38-42 -n 4  --file-
> prefix=virtio-user0 --no-pci   \
> > --vdev=net_virtio_user0,mac=00:11:22:33:44:10,path=./vhost-net0,queues
> > =8,mrg_rxbuf=1,in_order=1,packed_vq=1,server=1 \
> > -- -i --nb-cores=4 --rxq=8 --txq=8 --txd=1024 --rxd=1024
> > testpmd>set fwd csum
> > testpmd>start
> >
> > 3.Start dpdk-pdump to capture packets:
> >
> > x86_64-native-linuxapp-gcc/app/dpdk-pdump  -v
> > --file-prefix=virtio-user0 -- \ --pdump
> > 'device_id=net_virtio_user0,queue=0,rx-dev=/root/dpdk/pdump-rx-
> q0.pcap,mbuf-size=8000' --pdump  \
> 'device_id=net_virtio_user0,queue=1,rx-dev=/root/dpdk/pdump-rx-
> q1.pcap,mbuf-size=8000'
> >
> > 4.Set forwarding mode and send packets from vhost-user(execute this
> step must immediately, we use the automation script to do, it can be
> reproduced, and if I add time.sleep(1) before this step, it works well):
> >
> > testpmd>set fwd mac
> > testpmd>set txpkts 64,64,64,2000,2000,2000 set burst 1 start tx_first
> > testpmd>1 show port stats 0
> >
> > And I try to modify the follows code, then re-build DPDK, it works well.
> Maybe it's not a good method, just for your reference.
> >
> > diff --git a/lib/cmdline/cmdline_os_unix.c
> > b/lib/cmdline/cmdline_os_unix.c index 64a945a34f..ede8289244 100644
> > --- a/lib/cmdline/cmdline_os_unix.c
> > +++ b/lib/cmdline/cmdline_os_unix.c
> > @@ -37,7 +37,7 @@ cmdline_poll_char(struct cmdline *cl)
> >         pfd.events = POLLIN;
> >         pfd.revents = 0; -       return poll(&pfd, 1, 0);
> > +       return poll(&pfd, 1, -1);
> > } ssize_t
> 
> 
> Thanks, cmdline_poll() existed a long time but was never used by any part of
> DPDK until now. My preference is to get the old cmdline_read_char()
> working and just remove it.

Hi Stephen,

I have submit a Bugzilla bug: https://bugs.dpdk.org/show_bug.cgi?id=1181 to track this issue.

And I have verified based on DPDK23.03-rc2(baf13c3135) with this you new patch

(https://patches.dpdk.org/project/dpdk/patch/20230313213831.80071-1-stephen@networkplumber.org/) PASSED.

OS: Ubuntu 22.04.1 LTS/Linux 5.15.45-051545-generic

Regards,
Wei Ling