Re: [PATCH net-next v5 00/10] ipv6: report why a route was deleted in RTM_DELROUTE

[Yuyang Huang]

I checked the sashiko's comment:
https://patchwork.kernel.org/project/netdevbpf/patch/20260804014714.4362-10-sigefriedhyy@xxxxxxxxx/

> Should this new UAPI attribute also be added to the Netlink YAML
> specification?

> Is this new attribute missing from the netlink YAML
> specification?
> should this new attribute be documented in
> Documentation/netlink/specs/rt-route.yaml

> Is the del-reason (RTA_DEL_REASON) attribute missing from the YAML
> specification?

> Is there a missing patch in this series to actually report the
> deletion reason?

> Does this del_reason actually get passed from the deletion path?

These are answered by later patches in the same series.

> This is a pre-existing issue, but could this RTM_NEWROUTE be emitted
> out of order with respect to an RTM_DELROUTE?

Not related to the current series but might be worth sending a follow
up separately.

> Should this new enum and its entries include doc properties to
> describe the specific deletion reasons for the uAPI documentation?

Agreed, but it is a nit. If I need to send out patch series 6 due to
adjusting later review comments, I will include the fix for this
comment as well.

> Is RTA_DEL_REASON missing from rtm_ipv6_policy and rtm_ipv4_policy?
> [...] Should it be added to the policies as NLA_IGNORE or
> NLA_REJECT?
> Will the new RTA_DEL_REASON attribute be rejected if user space
> echoes it back? [...] causing an ABI breakage.

The comment seems wrong. The attribute is kernel to user space
notification-only, user space code should never set it.


Thanks,

Yuyang