[PATCH 2/2] lib/ethdev: add reverse macro to quit testpmd

[Wu, WenxuanX]

> -----Original Message-----
> From: Yigit, Ferruh <ferruh.yigit at intel.com>
> Sent: 2022年2月19日 1:05
> To: Wu, WenxuanX <wenxuanx.wu at intel.com>; Yang, Qiming
> <qiming.yang at intel.com>; Zhang, Qi Z <qi.z.zhang at intel.com>; Li, Xiaoyun
> <xiaoyun.li at intel.com>; Singh, Aman Deep <aman.deep.singh at intel.com>;
> Zhang, Yuying <yuying.zhang at intel.com>
> Cc: dev at dpdk.org
> Subject: Re: [PATCH 2/2] lib/ethdev: add reverse macro to quit testpmd
> 
> On 2/17/2022 10:14 AM, wenxuanx.wu at intel.com wrote:
> > From: wenxuan wu <wenxuanx.wu at intel.com>
> >
> > There is a heap-free-after-use bug when quit testpmd with pf and vfs,
> > stop and close ports in reverse order is a more reasonable approach.
> >
> > Cc: stable at dpdk.org
> >
> > Signed-off-by: wenxuan wu <wenxuanx.wu at intel.com>
> > ---
> >   lib/ethdev/rte_ethdev.h | 14 +++++++++++++-
> 
> This patch should come before testpmd patch, because testpmd is using
> macro defined here.
> 
> >   1 file changed, 13 insertions(+), 1 deletion(-)
> >
> > diff --git a/lib/ethdev/rte_ethdev.h b/lib/ethdev/rte_ethdev.h index
> > 2660e4f374..e080840b06 100644
> > --- a/lib/ethdev/rte_ethdev.h
> > +++ b/lib/ethdev/rte_ethdev.h
> > @@ -2185,9 +2185,13 @@ struct rte_eth_dev_owner {
> >    * @return
> >    *   Next valid port ID owned by owner_id, RTE_MAX_ETHPORTS if there is
> none.
> >    */
> > -uint64_t rte_eth_find_next_owned_by(uint16_t port_id,
> > +uint64_t
> > +rte_eth_find_next_owned_by(uint16_t port_id,
> >   		const uint64_t owner_id);
> >
> > +uint64_t
> > +rte_eth_find_prev_owned_by(uint16_t port_id, const uint64_t
> > +owner_id);
> > +
> 
> This function declared but not implemented, can remove above.


> 
> >   /**
> >    * Macro to iterate over all enabled ethdev ports owned by a specific
> owner.
> >    */
> > @@ -2212,6 +2216,14 @@ uint16_t rte_eth_find_next(uint16_t port_id);
> >   #define RTE_ETH_FOREACH_DEV(p) \
> >   	RTE_ETH_FOREACH_DEV_OWNED_BY(p, RTE_ETH_DEV_NO_OWNER)
> >
> > +/**
> > + * Macro to iterate over all enabled and ownerless ethdev ports in reverse
> order, for quit purpose.

Hi,
My next plan is like this:
Rough one:
---
For each dev:
	If( dev is a pf)
		Continue
	Close(dev)
For each dev :
	Close(dev)

Future version:
----
This will be a quick fix before 22.07,but if time is accepted,  I will try a more appropriate way ,like u mentioned . 
For each dev:
	If (dev has pf)://new api
		for each vf of this dev: //new api 
			close(vf)
	close(dev)
> 
> No need to add comment related to "quit purpose", macro can be used for
> different reasons.
> 
> > + */
> > +#define RTE_ETH_FOREACH_DEV_REVERSE(p) \
> > +	for (p = (rte_eth_dev_count_total() - 1 >= 0) ?
> > +(rte_eth_dev_count_total() - 1) : 0; \
> 
> Below check already relies on 'p' is unsigned, also
> 'rte_eth_dev_count_total()' returns unsigned, if so above check is
> unnecessary, it can just have:
> "p = rte_eth_dev_count_total() - 1"
> 
> > +	     p < rte_eth_dev_count_total(); \
> > +	     p--)
> > +
> >   /**
> >    * Iterates over ethdev ports of a specified device.
> >    *