On Tue, Oct 18, 2022 at 3:46 PM Zhu, Lingshan <lingshan.zhu@xxxxxxxxx> wrote: > > > > On 10/18/2022 3:30 PM, Jason Wang wrote: > > On Tue, Oct 18, 2022 at 3:28 PM Zhu, Lingshan <lingshan.zhu@xxxxxxxxx> wrote: > >> > >> > >> On 10/18/2022 2:44 PM, Jason Wang wrote: > >>> On Tue, Oct 18, 2022 at 10:20 AM Zhu, Lingshan <lingshan.zhu@xxxxxxxxx> wrote: > >>>> > >>>> On 10/17/2022 3:13 PM, Jason Wang wrote: > >>>>> On Mon, Oct 17, 2022 at 3:13 PM Jason Wang <jasowang@xxxxxxxxxx> wrote: > >>>>>> On Fri, Oct 14, 2022 at 5:50 PM Zhu Lingshan <lingshan.zhu@xxxxxxxxx> 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@xxxxxxxxx> > >>>>>> Note that Si Wei proposed to unify the two new attributes: > >>>>> https://patchew.org/linux/1665422823-18364-1-git-send-email-si-wei.liu@xxxxxxxxxx/ > >>>> 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 > >>>>>>> > _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
