On Mon, Aug 25, 2025 at 1:41 PM Johannes Berg <johannes@xxxxxxxxxxxxxxxx> wrote:
>
> On Fri, 2025-08-22 at 10:32 +0530, Sarika Sharma wrote:
> > Currently, the buffer size allocated for the get_station command in
> > nl80211_get_station is NLMSG_DEFAULT_SIZE, which, in some cases, is
> > insufficient to send complete output to user space and results in
> > "no buffer space available" error. This is especially evident in
> > setups with 3 links, where the amount of station info exceeds the
> > default allocation, leading to underflows and incomplete netlink
> > messages.
> >
> > To fix this, increase the buffer size to 4096 bytes. This ensures
> > that the nl80211_get_station() command can return complete station
> > information for up to 3 links without allocation failure.
> >
> > Fixes: 82d7f841d9bd ("wifi: cfg80211: extend to embed link level statistics in NL message")
> > Signed-off-by: Sarika Sharma <quic_sarishar@xxxxxxxxxxx>
> > ---
> > While this static increase is a practical short-term solution
>
> We haven't released this code, so we don't really need a short-term
> solution? We could even just disable it from 6.17 instead.
>
> So please let's see how big a real fix would be, or maybe we revert
> 82d7f841d9bd in 6.17 and do some other fixes for 6.18?
>
> johannes
>
Sure Johanes. Will allow user space to optionally request link-level statistics.
If this option is provided, we calculate the maximum message size and include
link-specific stats along with the existing station information. Otherwise,
we use the standard message size to return only the default accumulated
station stats.
Best Regards,
Nithy.
