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Date: Tue, 18 Oct 2022 15:49:42 +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, Si-Wei Liu <si-wei.liu@...cle.com>
Subject: Re: [PATCH] iproute2/vdpa: Add support for reading device features
On Tue, Oct 18, 2022 at 3:46 PM Zhu, Lingshan <lingshan.zhu@...el.com> wrote:
>
>
>
> On 10/18/2022 3:30 PM, Jason Wang wrote:
> > 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.
> I think the best netlink practice is to let every attr has its own
> and unique purpose, to prevent potential bugs. I think we have discussed
> this before that re-using
> an attr does not save any resource.
They have exactly the same semantic which is the device features for vDPA.
VDPA_ATTR_DEV_FEATURES is introduced by my features provisioning
series, which is used for the userspace to "set" the device features.
VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES is introduced in one of your
previous patches, which is used for userspace to "get" the device
features.
>
> And iprout2 has already updated the uapi header.
Yes, but iproute2 has the same schedule as kernel release, so it's not
too late to fix.
Thanks
>
> Thanks
> >
> > 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
> >>>>>>>
>
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