[dpdk-dev] [PATCH v5] net/i40e: fix mirror rule reset when port is stopped

[Dai, Wei]

Hi, Konstantin

Without this patch, when a port is stopped, all mirror SW resource are cleared but HW settings are still there.
And once the port is started again, creating mirror rule may fail due to remain HW settings.

There is a testpmd use case which can show why this patch is needed.
1. bind PF to igb_uio
#/root/dpdk-devbind.py -b igb_uio 0000:08:00.0
2. create 2 VFs
#echo 2 > /sys/bus/pci/devices/0000\:08\:00.0/max_vfs
3. launch testpmd with PF, and set port mirror configuration
#./x86_64-native-linuxapp-gcc/app/testpmd -c 3 -n 4 -- -i
 Testpmd > set port 0 mirror-rule 0 pool-mirror-up 0x1 dst-pool 1 on
 Testpmd > quit
4. relaunch testpmd with PF, and set port mirror as the same configuration
#./x86_64-native-linuxapp-gcc/app/testpmd -c 3 -n 4 -- -i
 Testpmd > set port 0 mirror-rule 0 pool-mirror-up 0x1 dst-pool 1 on
 I40e_mirror_rule_set( ): failed to add mirror rule: ret = -53, aq_err = 13.
 Mirror rule add error: (Function not implemented)

When testpmd is quitted, rte_eth_dev_stop( ) and then rte_eth_dev_close( ) are called.
In these function, i40e_dev_stop( ) and i40e_dev_close( ) is called.
And i40e_dev_stop is also called by i40e_dev_close( ).

Without this patch, the error in second running of testpmd always happen.
This patch can address this error.

> -----Original Message-----
> From: Ananyev, Konstantin
> Sent: Wednesday, September 20, 2017 5:23 PM
> To: Dai, Wei <wei.dai at intel.com>; Wu, Jingjing <jingjing.wu at intel.com>;
> Xing, Beilei <beilei.xing at intel.com>
> Cc: dev at dpdk.org; Dai, Wei <wei.dai at intel.com>; stable at dpdk.org
> Subject: RE: [dpdk-dev] [PATCH v5] net/i40e: fix mirror rule reset when port
> is stopped
> 
> Hi Wei,
> 
> >
> > When an i40e PF port is stopped, all mirror rules should be removed.
> > All rule related software and hardware resources should also be
> > removed.
> 
> Could you clarify why we have to remove all mirror rules when PF is
> stopped?
> As I remember mirror rule can direct to VF, which still can be running, no?
> Konstantin
> 
> >
> > Fixes: a4def5edf0fc ("i40e: enable port mirroring")
> > Cc: stable at dpdk.org
> >
> > Signed-off-by: Wei Dai <wei.dai at intel.com>
> > Tested-by: Lijuan Tu <lijuanx.a.tu at intel.com>
> > ---
> >  drivers/net/i40e/i40e_ethdev.c | 21 ++++++++++++++++++++-
> >  1 file changed, 20 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/i40e/i40e_ethdev.c
> > b/drivers/net/i40e/i40e_ethdev.c index f12aefa..14cf6c0 100644
> > --- a/drivers/net/i40e/i40e_ethdev.c
> > +++ b/drivers/net/i40e/i40e_ethdev.c
> > @@ -361,6 +361,12 @@ static int i40e_dev_sync_phy_type(struct
> i40e_hw
> > *hw);  static void i40e_configure_registers(struct i40e_hw *hw);
> > static void i40e_hw_init(struct rte_eth_dev *dev);  static int
> > i40e_config_qinq(struct i40e_hw *hw, struct i40e_vsi *vsi);
> > +static enum i40e_status_code i40e_aq_del_mirror_rule(struct i40e_hw
> *hw,
> > +						     uint16_t seid,
> > +						     uint16_t rule_type,
> > +						     uint16_t *entries,
> > +						     uint16_t count,
> > +						     uint16_t rule_id);
> >  static int i40e_mirror_rule_set(struct rte_eth_dev *dev,
> >  			struct rte_eth_mirror_conf *mirror_conf,
> >  			uint8_t sw_id, uint8_t on);
> > @@ -2069,6 +2075,7 @@ i40e_dev_stop(struct rte_eth_dev *dev)
> >  	struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
> >  	struct rte_intr_handle *intr_handle = &pci_dev->intr_handle;
> >  	int i;
> > +	int ret;
> >
> >  	if (hw->adapter_stopped == 1)
> >  		return;
> > @@ -2096,10 +2103,22 @@ i40e_dev_stop(struct rte_eth_dev *dev)
> >
> >  	/* Remove all mirror rules */
> >  	while ((p_mirror = TAILQ_FIRST(&pf->mirror_list))) {
> > +		ret = i40e_aq_del_mirror_rule(hw,
> > +					      pf->main_vsi->veb->seid,
> > +					      p_mirror->rule_type,
> > +					      p_mirror->entries,
> > +					      p_mirror->num_entries,
> > +					      p_mirror->id);
> > +		if (ret < 0)
> > +			PMD_DRV_LOG(ERR, "failed to remove mirror rule: "
> > +				    "status = %d, aq_err = %d.", ret,
> > +				    hw->aq.asq_last_status);
> > +
> > +		/* remove mirror software resource any way */
> >  		TAILQ_REMOVE(&pf->mirror_list, p_mirror, rules);
> >  		rte_free(p_mirror);
> > +		pf->nb_mirror_rule--;
> >  	}
> > -	pf->nb_mirror_rule = 0;
> >
> >  	if (!rte_intr_allow_others(intr_handle))
> >  		/* resume to the default handler */
> > --
> > 2.7.5