[PATCH wireless-next 0/5] wifi: cfg80211: Add fragmented per-link station stats in MLO

[Johannes Berg]

On Sun, 2026-06-07 at 23:29 +0530, P Praneesh wrote:
> This series introduces fragmentation support for Multi-Link Operation
> (MLO) station statistics in nl80211.
> 
> The current nl80211_dump_station() implementation works well for legacy
> (single-link) stations, but it does not scale for MLO peers. With
> multiple links per station, dumping all per-link information in a single
> netlink message can exceed size limits, resulting in -EMSGSIZE errors
> and incomplete dumps.
> 
> With 802.11be (Wi‑Fi 7), a single station may have multiple links, each
> with its own statistics. To address this, this series introduces a
> stateful dump mechanism that splits station information into multiple
> messages when required.
> 
> The dump is performed in two phases:
>   - Phase 0: Aggregated (station-level) statistics
>   - Phase 1: Per-link statistics sent in separate messages

[snip]

Overall, this approach seems (mostly?) right. I have a couple of
comments reading the code itself, but also:

> Aggregated Stats (Phase 0)
> 
> NL80211_CMD_NEW_STATION
>  ├─ NL80211_ATTR_IFINDEX
>  ├─ NL80211_ATTR_MAC
>  ├─ NL80211_ATTR_GENERATION
>  └─ NL80211_ATTR_STA_INFO
>       ├─ <aggregated station attributes>
>       └─ ...
> 
> Note: No NL80211_ATTR_MLO_LINKS is included in this phase.
> Per‑link stats are sent in Phase 1.
> 
> Per-Link Stats (Phase 1)
> 
> NL80211_CMD_NEW_STATION
>   ├─ NL80211_ATTR_IFINDEX
>   ├─ NL80211_ATTR_MAC                 (MLO MAC)
>   ├─ NL80211_ATTR_GENERATION
>   └─ NL80211_ATTR_STA_INFO
>        └─ NL80211_ATTR_MLO_LINKS
>             ├─ [link0]
>             │    ├─ NL80211_ATTR_MLO_LINK_ID = 0
>             │    ├─ NL80211_ATTR_MAC = <link0 MAC>
>             │    ├─ NL80211_STA_INFO_RX_BYTES
>             │    ├─ NL80211_STA_INFO_TX_BYTES
>             │    └─ ... more link0 stats ...

This description is missing another nesting level as
NL80211_ATTR_STA_INFO no?

johannes