Re: [PATCH] wifi: brcmfmac: configure SAE PWE method for external SAE AP

Gokul (representing Infineon) promised he would send a patch a while back.
This would be a preferred solution as it comes directly from the vendor.
But it also takes time. I can send a revised patch next week.

Regards,
Bogdan

On Sun, Aug 2, 2026 at 3:39 AM Arend van Spriel
<[email protected]> wrote:
>
> On Wed, 29 Jul 2026 00:34:08 -0500, Bogdan Nicolae wrote:
> > When bringing up a WPA3-SAE SoftAP with external (user space) SAE, the
> > driver never told the firmware which SAE Password Element (PWE) method to
> > accept. The firmware was observed to corrupt its heap over time due to
> > this omission, leading to firmware trap (data abort in heap allocator).
> >
> > Parse the beacon IEs on start_ap() and set the extsae_pwe iovar
> > accordingly: 2 when the RSNX IE advertises H2E, 1 when an H2E-only
> > membership selector is present, 0 otherwise. This matches the behaviour
> > of the upstream/vendor driver and only applies to SAE-capable APs when
> > external SAE is supported.
> >
> > Signed-off-by: Bogdan Nicolae <[email protected]>
> > ---
> >  .../broadcom/brcm80211/brcmfmac/cfg80211.c    | 75 +++++++++++++++++++
> >  1 file changed, 75 insertions(+)
>
> As discussed the extsae_pwe iovar is vendor specific so the fix needs to
> be gated on the CYW vendor. The cleanest approach would be to add a fwvid
> hook (following the pattern of set_sae_password in brcmfmac/cyw/) so
> brcmf_parse_configure_sae_pwe() is only invoked for CYW chipsets.
>
> [...]
>
> > +#define BSS_MEMBERSHIP_SELECTOR_SAE_H2E_ONLY 123
>
> This is already defined as BSS_MEMBERSHIP_SELECTOR_SAE_H2E in
> <linux/ieee80211.h>. Please reuse the existing constant.
>
> [...]
>
> Regards,
> Arend