[dpdk-dev] [PATCH v2 0/4] NIC filters support for generic filter

[Wu, Jingjing]

Hi, Vladimir

Thanks a lot for your remarks.

Yes, your understanding is correct, in non-IOV mode, we can use 64pool, per pool can has 2 queues when ETH_MQ_RX_VMDQ_ONLY.  While in IOV mode, current DPDK version makes the number of queue to 1 by default. The pools logic makes sense, but I didn’t consider it globally with the thinking we can do it in future. I will be great if you can generate a new patch based on mine. Or we can discuss it further? Due to it is close to the feature deliver time now and much verification work for it, it may not possible to add it in this patch.

In API
About your first remark, the reason why I didn’t put the queue in the filter structure is that the filter contains the fields used for comparison and the queue is acted as result, and another concern is to keep consistent with flow director’s implementation.
About your second remark, I will accept it and integrate the change to patch in new version.

Do your  agree my proposal?


From: Vladimir Medvedkin [mailto:medvedkinv at gmail.com]
Sent: Friday, June 13, 2014 7:52 PM
To: Thomas Monjalon
Cc: Wu, Jingjing; dev at dpdk.org
Subject: Re: [dpdk-dev] [PATCH v2 0/4] NIC filters support for generic filter

Hi all,
The 82599 datasheet (p. 284 and p.287) has only recommendations and only when possible about assign rx queue not used by RSS/DCB. I do not see any serious restrictions do not assign the rx queue used by RSS/DCB.
For cases with only 1 queue if I understand correctly this patch http://dpdk.org/ml/archives/dev/2014-May/002589.html we can init second queue in pool and assign it by filter. In ETH_MQ_RX_VMDQ_ONLY  mode init all possible queues (even if hardware route packets to zero queue in pools) so there no problem. Moreover, it is not necesary for rx queue to be set in the same pool.

About genericity. I agree with Jingjing, different controllers have different definitions for pools or VFs. And it is only Intel controllers! It is very hard to predict hardware implementation. For example for Fortville I can not find 5-tuple filters at all.

API. I have several remarks.
1. You use rx_queue as separate arg. For example:
rte_eth_dev_add_ethertype_filter(uint8_t port_id, uint16_t index, struct rte_ethertype_filter *filter, uint8_t rx_queue)
rte_eth_dev_get_ethertype_filter(uint8_t port_id, uint16_t index, struct rte_ethertype_filter *filter, uint8_t *rx_queue)
you can move uint8_t rx_queue into struct rte_ethertype_filter *filter.
2. In SYN filter:
rte_eth_dev_add_syn_filter(uint8_t port_id, uint8_t high_pri, uint8_t rx_queue)
rte_eth_dev_get_syn_filter(uint8_t port_id, struct rte_syn_filter *filter, uint8_t *rx_queue)
In first ADD func you alloc struct rte_syn_filter inside func, but in GET func you have to alloc struct rte_syn_filter in your app. May be better to do
rte_eth_dev_add_syn_filter(uint8_t port_id, struct rte_syn_filter *filter, uint8_t *rx_queue) ?

So, Jingjing made a lot of work, much more then I (igb filters, testpmd commands). It works the same as mine (not counting pools logic), so let's integrate it (it's will be great if jingjing change api according to my remarks).

Regards,
Vladimir

2014-06-12 19:36 GMT+04:00 Thomas Monjalon <thomas.monjalon at 6wind.com<mailto:thomas.monjalon at 6wind.com>>:
> 2014-06-11 17:45, Thomas Monjalon:
> > My main concern is that Vladimir Medvedkin suggested another API and I'd
> > like you give your opinion about it:
> >             http://dpdk.org/ml/archives/dev/2014-June/003053.html
> > It offers pool number in configuration of the filters.
2014-06-12 08:08, Wu, Jingjing:
> The pool field is used in virtualization scenario. It is acting as one of
> input set during filter matching in ixgbe.
> My patch didn't consider the virtualization scenario in generic filter
> feature. Because in 82599 datasheet, it is recommended to assign rx queues
> not used by DCB/RSS, that is virtualization without RSS and DCB mode. For
> this mode, current DPDK version makes the number of queue to 1 by default in
> IOV mode. So in this case it makes no sense make pool as a input set and the
> rx queue also need to be set to in this pool, so just keep the consistent
> with flow director who also ignore it in previous version.
> And further E1000/Niantic/Fortville have different definitions for VF, we
> need to think how to define it more generic.
> And even just need offer pool number in configuration of the filters as what
> Vladimir did, it also need to verify the interworking with Virtualization
> for different kinds of NICs, and the interworking with DCB and RSS which is
> not recommended in 82599's datasheet.
> So I think it will be a good choice to implement generic filter interworking
> with virtualization in future patch. If there is any volunteer to send patch
> for support this concern later, it will be also cool.
Vladimir, do you agree with this analysis?
As you suggested another implementation, I need you acknowledgment for this
patchset to be integrated.

Thanks
--
Thomas