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

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Date:   Tue, 18 Oct 2022 14:44:33 +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 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.

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
> >>>
>