netdev - Re: [PATCH] iproute2/vdpa: Add support for reading device features

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Message-ID: <CACGkMEtRd3pmN-rYj1LMsckTkNaqHFH7xkdccBK1Z9xzRo9KZw@mail.gmail.com>
Date:   Tue, 18 Oct 2022 15:30:57 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Zhu, Lingshan" <lingshan.zhu@...el.com>
Cc:     mst@...hat.com, stephen@...workplumber.org, dsahern@...nel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        hang.yuan@...el.com
Subject: Re: [PATCH] iproute2/vdpa: Add support for reading device features

On Tue, Oct 18, 2022 at 3:28 PM Zhu, Lingshan <lingshan.zhu@...el.com> wrote:
>
>
>
> On 10/18/2022 2:44 PM, Jason Wang wrote:
> > On Tue, Oct 18, 2022 at 10:20 AM Zhu, Lingshan <lingshan.zhu@...el.com> wrote:
> >>
> >>
> >> On 10/17/2022 3:13 PM, Jason Wang wrote:
> >>> On Mon, Oct 17, 2022 at 3:13 PM Jason Wang <jasowang@...hat.com> wrote:
> >>>> On Fri, Oct 14, 2022 at 5:50 PM Zhu Lingshan <lingshan.zhu@...el.com> wrote:
> >>>>> This commit implements support for reading vdpa device
> >>>>> features in iproute2.
> >>>>>
> >>>>> Example:
> >>>>> $ vdpa dev config show vdpa0
> >>>>> vdpa0: mac 00:e8:ca:11:be:05 link up link_announce false max_vq_pairs 4 mtu 1500
> >>>>>     negotiated_features MRG_RXBUF CTRL_VQ MQ VERSION_1 ACCESS_PLATFORM
> >>>>>     dev_features MTU MAC MRG_RXBUF CTRL_VQ MQ ANY_LAYOUT VERSION_1 ACCESS_PLATFORM
> >>>>>
> >>>>> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
> >>>> Note that Si Wei proposed to unify the two new attributes:
> >>> https://patchew.org/linux/1665422823-18364-1-git-send-email-si-wei.liu@oracle.com/
> >> I think we have discussed this before, there should be two netlink
> >> attributes to report management device features and vDPA device features,
> >> they are different type of devices, this unification introduces
> >> unnecessary couplings
> > I suggest going through the above patch, both attributes are for the
> > vDPA device only.
> It seems not vDPA device only, from above patch, we see it re-uses
> VDPA_ATTR_DEV_FEATURES for reporting vDPA device features

Yes, anything wrong with this? The device features could be
provisioned via netlink.

Thanks

>
> Thanks
> >
> > Thanks
> >
> >> Thanks
> >>> Thanks
> >>>
> >>>>> ---
> >>>>>    vdpa/vdpa.c | 15 +++++++++++++--
> >>>>>    1 file changed, 13 insertions(+), 2 deletions(-)
> >>>>>
> >>>>> diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
> >>>>> index b73e40b4..89844e92 100644
> >>>>> --- a/vdpa/vdpa.c
> >>>>> +++ b/vdpa/vdpa.c
> >>>>> @@ -87,6 +87,8 @@ static const enum mnl_attr_data_type vdpa_policy[VDPA_ATTR_MAX + 1] = {
> >>>>>           [VDPA_ATTR_DEV_NEGOTIATED_FEATURES] = MNL_TYPE_U64,
> >>>>>           [VDPA_ATTR_DEV_MGMTDEV_MAX_VQS] = MNL_TYPE_U32,
> >>>>>           [VDPA_ATTR_DEV_SUPPORTED_FEATURES] = MNL_TYPE_U64,
> >>>>> +       [VDPA_ATTR_DEV_FEATURES] = MNL_TYPE_U64,
> >>>>> +       [VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES] = MNL_TYPE_U64,
> >>>>>    };
> >>>>>
> >>>>>    static int attr_cb(const struct nlattr *attr, void *data)
> >>>>> @@ -482,7 +484,7 @@ static const char * const *dev_to_feature_str[] = {
> >>>>>
> >>>>>    #define NUM_FEATURE_BITS 64
> >>>>>
> >>>>> -static void print_features(struct vdpa *vdpa, uint64_t features, bool mgmtdevf,
> >>>>> +static void print_features(struct vdpa *vdpa, uint64_t features, bool devf,
> >>>>>                              uint16_t dev_id)
> >>>>>    {
> >>>>>           const char * const *feature_strs = NULL;
> >>>>> @@ -492,7 +494,7 @@ static void print_features(struct vdpa *vdpa, uint64_t features, bool mgmtdevf,
> >>>>>           if (dev_id < ARRAY_SIZE(dev_to_feature_str))
> >>>>>                   feature_strs = dev_to_feature_str[dev_id];
> >>>>>
> >>>>> -       if (mgmtdevf)
> >>>>> +       if (devf)
> >>>>>                   pr_out_array_start(vdpa, "dev_features");
> >>>>>           else
> >>>>>                   pr_out_array_start(vdpa, "negotiated_features");
> >>>>> @@ -771,6 +773,15 @@ static void pr_out_dev_net_config(struct vdpa *vdpa, struct nlattr **tb)
> >>>>>                   val_u64 = mnl_attr_get_u64(tb[VDPA_ATTR_DEV_NEGOTIATED_FEATURES]);
> >>>>>                   print_features(vdpa, val_u64, false, dev_id);
> >>>>>           }
> >>>>> +       if (tb[VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES]) {
> >>>>> +               uint16_t dev_id = 0;
> >>>>> +
> >>>>> +               if (tb[VDPA_ATTR_DEV_ID])
> >>>>> +                       dev_id = mnl_attr_get_u32(tb[VDPA_ATTR_DEV_ID]);
> >>>>> +
> >>>>> +               val_u64 = mnl_attr_get_u64(tb[VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES]);
> >>>>> +               print_features(vdpa, val_u64, true, dev_id);
> >>>>> +       }
> >>>>>    }
> >>>>>
> >>>>>    static void pr_out_dev_config(struct vdpa *vdpa, struct nlattr **tb)
> >>>>> --
> >>>>> 2.31.1
> >>>>>
>