Re: [dpdk-dev] [PATCH v4 2/6] ixgbe: Negotiate VF API version

["Ouyang, Changchun" <changchun.ouyang@intel.com>]

> -----Original Message-----
> From: Vlad Zolotarov [mailto:vladz@cloudius-systems.com]
> Sent: Sunday, January 4, 2015 4:40 PM
> To: Ouyang, Changchun; dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v4 2/6] ixgbe: Negotiate VF API version
> 
> 
> On 01/04/15 10:37, Ouyang, Changchun wrote:
> > Hi Vlad,
> >
> >> -----Original Message-----
> >> From: Vlad Zolotarov [mailto:vladz@cloudius-systems.com]
> >> Sent: Sunday, January 4, 2015 4:30 PM
> >> To: Ouyang, Changchun; dev@dpdk.org
> >> Subject: Re: [dpdk-dev] [PATCH v4 2/6] ixgbe: Negotiate VF API
> >> version
> >>
> >>
> >> On 01/04/15 10:26, Vlad Zolotarov wrote:
> >>> On 01/04/15 09:18, Ouyang Changchun wrote:
> >>>> Negotiate API version with VF when receiving the
> >>>> IXGBE_VF_API_NEGOTIATE message.
> >>>>
> >>>> Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com>
> >>> Reviewed-by: Vlad Zolotarov <vladz@cloudius-systems.com>
> > Thanks for your reviewing.
> >
> >> One small remark below.
> >>
> >>>> ---
> >>>>    lib/librte_pmd_ixgbe/ixgbe_ethdev.h |  1 +
> >>>>    lib/librte_pmd_ixgbe/ixgbe_pf.c     | 25
> +++++++++++++++++++++++++
> >>>>    2 files changed, 26 insertions(+)
> >>>>
> >>>> diff --git a/lib/librte_pmd_ixgbe/ixgbe_ethdev.h
> >>>> b/lib/librte_pmd_ixgbe/ixgbe_ethdev.h
> >>>> index ca99170..730098d 100644
> >>>> --- a/lib/librte_pmd_ixgbe/ixgbe_ethdev.h
> >>>> +++ b/lib/librte_pmd_ixgbe/ixgbe_ethdev.h
> >>>> @@ -159,6 +159,7 @@ struct ixgbe_vf_info {
> >>>>        uint16_t tx_rate[IXGBE_MAX_QUEUE_NUM_PER_VF];
> >>>>        uint16_t vlan_count;
> >>>>        uint8_t spoofchk_enabled;
> >>>> +    uint8_t api_version;
> >>>>    };
> >>>>      /*
> >>>> diff --git a/lib/librte_pmd_ixgbe/ixgbe_pf.c
> >>>> b/lib/librte_pmd_ixgbe/ixgbe_pf.c index 51da1fd..495aff5 100644
> >>>> --- a/lib/librte_pmd_ixgbe/ixgbe_pf.c
> >>>> +++ b/lib/librte_pmd_ixgbe/ixgbe_pf.c
> >>>> @@ -469,6 +469,28 @@ ixgbe_set_vf_lpe(struct rte_eth_dev *dev,
> >>>> __rte_unused uint32_t vf, uint32_t *ms
> >>>>    }
> >>>>      static int
> >>>> +ixgbe_negotiate_vf_api(struct rte_eth_dev *dev, uint32_t vf,
> >>>> uint32_t *msgbuf)
> >>>> +{
> >>>> +    uint32_t api_version = msgbuf[1];
> >>>> +    struct ixgbe_vf_info *vfinfo =
> >>>> +*IXGBE_DEV_PRIVATE_TO_P_VFDATA(dev->data->dev_private);
> >>>> +
> >>>> +    switch (api_version) {
> >>>> +    case ixgbe_mbox_api_10:
> >>>> +    case ixgbe_mbox_api_11:
> >> Why version 2.0 is not negotiated?
> >>
> > Because it doesn't fully support 2.0 features yet.
> 
> Well, it that case u should not support 2.0 in patch 3 as well.
My opinion is that In patch 3, ixgbe_get_vf_queues need api_11 or api_20 to support it,
That mean the feature require those 2 api version, and it can't work with lower version like api_10.
Here the code show the pf has the capability of supporting api_10 and api_11,
I think it doesn't contradict. 
Thanks
Changchun