Re: [dpdk-dev] [PATCH v2] app/testpmd: removed softnic CLI modifications

["Singh, Jasvinder" <jasvinder.singh@intel.com>]

> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas@monjalon.net]
> Sent: Wednesday, July 25, 2018 3:43 PM
> To: Moti Haimovsky <motih@mellanox.com>
> Cc: dev@dpdk.org; stable@dpdk.org; Singh, Jasvinder
> <jasvinder.singh@intel.com>; Dumitrescu, Cristian
> <cristian.dumitrescu@intel.com>; Ananyev, Konstantin
> <konstantin.ananyev@intel.com>
> Subject: Re: [PATCH v2] app/testpmd: removed softnic CLI modifications
> 
> +Cc
> 
> 25/07/2018 16:40, Moti Haimovsky:
> > This patch reverts the testpmd CLI prompt routine modifications done
> > in order to support softnic.
> > The reason of doing so is due to testpmd abnormal exit observed on
> > several setups caused by the softnic modifications to this routine,
> > for example: When running testpmd with tap interface (/app/testpmd  -n
> > 4 --vdev=net_tap0,iface=tap0,remote=eth1 -- --burst=64
> >  --mbcache=512 -i --nb-cores=7 --rxq=2 --txq=2 --txd=512
> >  --rxd=512 --port-topology=chained --forward-mode=rxonly) testpmd
> > crashes seconds after presenting its prompt with the following
> > error:
> >   testpmd> PANIC in prompt():
> >   CLI poll error (-1)
> >
> >   Thread 1 "testpmd" received signal SIGABRT, Aborted.
> >   0x00007ffff668e0d0 in raise () from /lib64/libc.so.6
> >   (gdb) bt
> >   #0  0x00007ffff668e0d0 in raise () from /lib64/libc.so.6
> >   #1  0x00007ffff668f6b1 in abort () from /lib64/libc.so.6
> >   #2  0x0000000000468027 in __rte_panic ()
> >   #3  0x00000000004876ed in prompt ()
> >   #4  0x000000000046dffc in main ()
> >
> > When running testpmd with bare-metal device (app/testpmd -n 4
> > --socket-mem=1024,1024 -w 04:00.0  --
> >  --burst=64 --mbcache=512 -i  --nb-cores=7
> >  --rxq=64  --txq=4 --txd=16 --rxd=16)
> > and pressing CTRL+D right after testpmd prompt is presented then the
> > program crashes while presenting the same messages as above.
> >
> > Needless to say that this behavior is not observed when using the
> > previous CLI prompt routine.
> >
> > Fixes: 0ad778b398c6 ("app/testpmd: rework softnic forward mode")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Moti Haimovsky <motih@mellanox.com>
> > ---
> > v2:
> > * Removed softnic modifications altogether.
> > v1:
> > * Wrapped softnic modifications with compilation switch.
> > ---
> >  app/test-pmd/cmdline.c | 39 ++-------------------------------------
> >  1 file changed, 2 insertions(+), 37 deletions(-)
> >
> > diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c index
> > 2c32029..d058860 100644
> > --- a/app/test-pmd/cmdline.c
> > +++ b/app/test-pmd/cmdline.c
> > @@ -17896,50 +17896,15 @@ struct
> > cmd_config_per_queue_tx_offload_result {  void
> >  prompt(void)
> >  {
> > -	int status;
> > -
> >  	/* initialize non-constant commands */
> >  	cmd_set_fwd_mode_init();
> >  	cmd_set_fwd_retry_mode_init();
> >
> > -#if defined RTE_LIBRTE_PMD_SOFTNIC
> > -	portid_t softnic_portid, pid;
> > -	uint8_t softnic_enable = 0;
> > -
> > -	if (strcmp(cur_fwd_eng->fwd_mode_name, "softnic") == 0) {
> > -		RTE_ETH_FOREACH_DEV(pid) {
> > -			struct rte_port *port = &ports[pid];
> > -			const char *driver = port->dev_info.driver_name;
> > -
> > -			if (strcmp(driver, "net_softnic") == 0) {
> > -				softnic_portid = pid;
> > -				softnic_enable = 1;
> > -				break;
> > -			}
> > -		}
> > -	}
> > -#endif
> > -
> >  	testpmd_cl = cmdline_stdin_new(main_ctx, "testpmd> ");
> >  	if (testpmd_cl == NULL)
> >  		return;
> > -
> > -	for (;;) {
> > -		status = cmdline_poll(testpmd_cl);
> > -		if (status < 0)
> > -			rte_panic("CLI poll error (%" PRId32 ")\n", status);
> > -		else if (status == RDLINE_EXITED) {
> > -			cmdline_stdin_exit(testpmd_cl);
> > -			rte_exit(0, "\n");
> > -		}
> > -
> > -#if defined RTE_LIBRTE_PMD_SOFTNIC
> > -
> > -	if ((softnic_enable == 1) &&
> > -		(strcmp(cur_fwd_eng->fwd_mode_name, "softnic") == 0))
> > -		rte_pmd_softnic_manage(softnic_portid);
> > -#endif
> > -	}
> > +	cmdline_interact(testpmd_cl);
> > +	cmdline_stdin_exit(testpmd_cl);
> >  }
> >
> >  void
> >

With above changes in cmdline.c, you should also consider removing following from the file -

#ifdef RTE_LIBRTE_PMD_SOFTNIC
#include <rte_eth_softnic.h>
#endif