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References: <20220722122956.841786-1-alvin@pqrs.dk> <20220722122956.841786-2-alvin@pqrs.dk>
 <CA+8PC_fYF7aZCBEweF5s0+8Rr_5yRQcMutFJ2gCKs6QEdmrw6g@mail.gmail.com> <20220817085015.z3ubo4vhi5jeiopo@bang-olufsen.dk>
In-Reply-To: <20220817085015.z3ubo4vhi5jeiopo@bang-olufsen.dk>
From:   Franky Lin <franky.lin@broadcom.com>
Date:   Mon, 22 Aug 2022 10:12:14 -0700
Message-ID: <CA+8PC_fGeV09ve=VE=V9yneghg_rfDZmEAZBVmA9rivinMmd5A@mail.gmail.com>
Subject: Re: [PATCH -next 1/2] brcmfmac: Support multiple AP interfaces and
 fix STA disconnection issue
To:     =?UTF-8?Q?Alvin_=C5=A0ipraga?= <ALSI@bang-olufsen.dk>
Cc:     =?UTF-8?Q?Alvin_=C5=A0ipraga?= <alvin@pqrs.dk>,
        Arend van Spriel <aspriel@gmail.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Kalle Valo <kvalo@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Soon Tak Lee <soontak.lee@cypress.com>,
        Chi-Hsien Lin <chi-hsien.lin@cypress.com>,
        Ahmad Fatoum <a.fatoum@pengutronix.de>,
        "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
        "brcm80211-dev-list.pdl@broadcom.com" 
        <brcm80211-dev-list.pdl@broadcom.com>,
        "SHA-cyfmac-dev-list@infineon.com" <SHA-cyfmac-dev-list@infineon.com>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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Hi Alvin,

On Wed, Aug 17, 2022 at 1:50 AM Alvin =C5=A0ipraga <ALSI@bang-olufsen.dk> w=
rote:
>
> Hi Franky,
>
> On Wed, Aug 10, 2022 at 02:32:06PM -0700, Franky Lin wrote:
> > On Fri, Jul 22, 2022 at 5:30 AM Alvin =C5=A0ipraga <alvin@pqrs.dk> wrot=
e:
> > >
> > > From: Soontak Lee <soontak.lee@cypress.com>
> > >
> > > Support multiple AP interfaces for STA + AP + AP usecase.
> >
> > AFAIK, Broadcom's fullmac firmware doesn't support such 2AP + 1STA use =
case.
>
> Thanks for the clarification. The series should be ignored by Kalle
> then.
>
> >
> > > And fix STA disconnection when deactivating AP interface.
> > >
> > > Signed-off-by: Soontak Lee <soontak.lee@cypress.com>
> > > Signed-off-by: Chi-Hsien Lin <chi-hsien.lin@cypress.com>
> > > Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> > > Signed-off-by: Alvin =C5=A0ipraga <alsi@bang-olufsen.dk>
> > > ---
> > >  .../broadcom/brcm80211/brcmfmac/cfg80211.c    | 48 +++++++++++++++--=
--
> > >  .../broadcom/brcm80211/brcmfmac/cfg80211.h    |  1 +
> > >  .../broadcom/brcm80211/brcmfmac/common.c      |  5 ++
> > >  3 files changed, 44 insertions(+), 10 deletions(-)
> > >
> > > diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg8021=
1.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> > > index 3ae6779fe153..856fd5516ddf 100644
> > > --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> > > +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> > > @@ -4747,6 +4747,7 @@ brcmf_cfg80211_start_ap(struct wiphy *wiphy, st=
ruct net_device *ndev,
> > >                   settings->inactivity_timeout);
> > >         dev_role =3D ifp->vif->wdev.iftype;
> > >         mbss =3D ifp->vif->mbss;
> > > +       brcmf_dbg(TRACE, "mbss %s\n", mbss ? "enabled" : "disabled");
> > >
> > >         /* store current 11d setting */
> > >         if (brcmf_fil_cmd_int_get(ifp, BRCMF_C_GET_REGULATORY,
> > > @@ -4961,6 +4962,9 @@ brcmf_cfg80211_start_ap(struct wiphy *wiphy, st=
ruct net_device *ndev,
> > >         if ((err) && (!mbss)) {
> > >                 brcmf_set_mpc(ifp, 1);
> > >                 brcmf_configure_arp_nd_offload(ifp, true);
> > > +       } else {
> > > +               cfg->num_softap++;
> > > +               brcmf_dbg(TRACE, "Num of SoftAP %u\n", cfg->num_softa=
p);
> > >         }
> > >         return err;
> > >  }
> > > @@ -4975,6 +4979,7 @@ static int brcmf_cfg80211_stop_ap(struct wiphy =
*wiphy, struct net_device *ndev,
> > >         s32 err;
> > >         struct brcmf_fil_bss_enable_le bss_enable;
> > >         struct brcmf_join_params join_params;
> > > +       s32 apsta =3D 0;
> > >
> > >         brcmf_dbg(TRACE, "Enter\n");
> > >
> > > @@ -4983,6 +4988,27 @@ static int brcmf_cfg80211_stop_ap(struct wiphy=
 *wiphy, struct net_device *ndev,
> > >                 /* first to make sure they get processed by fw. */
> > >                 msleep(400);
> > >
> > > +               cfg->num_softap--;
> > > +
> > > +               /* Clear bss configuration and SSID */
> > > +               bss_enable.bsscfgidx =3D cpu_to_le32(ifp->bsscfgidx);
> > > +               bss_enable.enable =3D cpu_to_le32(0);
> > > +               err =3D brcmf_fil_iovar_data_set(ifp, "bss", &bss_ena=
ble,
> > > +                                              sizeof(bss_enable));
> > > +               if (err < 0)
> > > +                       brcmf_err("bss_enable config failed %d\n", er=
r);
> > > +
> > > +               memset(&join_params, 0, sizeof(join_params));
> > > +               err =3D brcmf_fil_cmd_data_set(ifp, BRCMF_C_SET_SSID,
> > > +                                            &join_params, sizeof(joi=
n_params));
> > > +               if (err < 0)
> > > +                       bphy_err(drvr, "SET SSID error (%d)\n", err);
> > > +
> > > +               if (cfg->num_softap) {
> > > +                       brcmf_dbg(TRACE, "Num of SoftAP %u\n", cfg->n=
um_softap);
> > > +                       return 0;
> > > +               }
> > > +
> > >                 if (profile->use_fwauth !=3D BIT(BRCMF_PROFILE_FWAUTH=
_NONE)) {
> > >                         if (profile->use_fwauth & BIT(BRCMF_PROFILE_F=
WAUTH_PSK))
> > >                                 brcmf_set_pmk(ifp, NULL, 0);
> > > @@ -5000,17 +5026,18 @@ static int brcmf_cfg80211_stop_ap(struct wiph=
y *wiphy, struct net_device *ndev,
> > >                 if (ifp->bsscfgidx =3D=3D 0)
> > >                         brcmf_fil_iovar_int_set(ifp, "closednet", 0);
> > >
> > > -               memset(&join_params, 0, sizeof(join_params));
> > > -               err =3D brcmf_fil_cmd_data_set(ifp, BRCMF_C_SET_SSID,
> > > -                                            &join_params, sizeof(joi=
n_params));
> > > -               if (err < 0)
> > > -                       bphy_err(drvr, "SET SSID error (%d)\n", err);
> > > -               err =3D brcmf_fil_cmd_int_set(ifp, BRCMF_C_DOWN, 1);
> > > -               if (err < 0)
> > > -                       bphy_err(drvr, "BRCMF_C_DOWN error %d\n", err=
);
> > > -               err =3D brcmf_fil_cmd_int_set(ifp, BRCMF_C_SET_AP, 0)=
;
> > > +               err =3D brcmf_fil_iovar_int_get(ifp, "apsta", &apsta)=
;
> > >                 if (err < 0)
> > > -                       bphy_err(drvr, "setting AP mode failed %d\n",=
 err);
> > > +                       brcmf_err("wl apsta failed (%d)\n", err);
> > > +
> > > +               if (!apsta) {
> > > +                       err =3D brcmf_fil_cmd_int_set(ifp, BRCMF_C_DO=
WN, 1);
> > > +                       if (err < 0)
> > > +                               bphy_err(drvr, "BRCMF_C_DOWN error %d=
\n", err);
> > > +                       err =3D brcmf_fil_cmd_int_set(ifp, BRCMF_C_SE=
T_AP, 0);
> > > +                       if (err < 0)
> > > +                               bphy_err(drvr, "Set AP mode error %d\=
n", err);
> > > +               }
> > >                 if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_MBSS))
> > >                         brcmf_fil_iovar_int_set(ifp, "mbss", 0);
> > >                 brcmf_fil_cmd_int_set(ifp, BRCMF_C_SET_REGULATORY,
> > > @@ -7641,6 +7668,7 @@ struct brcmf_cfg80211_info *brcmf_cfg80211_atta=
ch(struct brcmf_pub *drvr,
> > >
> > >         cfg->wiphy =3D wiphy;
> > >         cfg->pub =3D drvr;
> > > +       cfg->num_softap =3D 0;
> > >         init_vif_event(&cfg->vif_event);
> > >         INIT_LIST_HEAD(&cfg->vif_list);
> > >
> > > diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg8021=
1.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
> > > index e90a30808c22..e4ebc2fa6ebb 100644
> > > --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
> > > +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
> > > @@ -371,6 +371,7 @@ struct brcmf_cfg80211_info {
> > >         struct brcmf_cfg80211_wowl wowl;
> > >         struct brcmf_pno_info *pno;
> > >         u8 ac_priority[MAX_8021D_PRIO];
> > > +       u8 num_softap;
> > >  };
> > >
> > >  /**
> > > diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.=
c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
> > > index fe01da9e620d..83e023a22f9b 100644
> > > --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
> > > +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
> > > @@ -303,6 +303,11 @@ int brcmf_c_preinit_dcmds(struct brcmf_if *ifp)
> > >                 brcmf_dbg(INFO, "CLM version =3D %s\n", clmver);
> > >         }
> > >
> > > +       /* set apsta */
> > > +       err =3D brcmf_fil_iovar_int_set(ifp, "apsta", 1);
> > > +       if (err)
> > > +               brcmf_info("failed setting apsta, %d\n", err);
> > > +
> >
> > I do not understand why entering apsta mode by default. The mode is
> > supposed to be enabled only when an AP interface is created in
> > brcmf_cfg80211_start_ap. I think one of the side effects of apsta mode
> > is that memory footprint significantly increases. It should remain
> > disabled for STA only mode (which is the major use case) for better
> > performance.
>
> By better performance, do you just mean "lower chance of memory
> exhaustion"? If so, surely the firmware would be designed such that it
> doesn't run out of memory under the advertised use-cases (STA, AP+STA
> etc.), regardless of the current apsta setting?

I think some packet related buffers will be adjusted for apsta mode so
the sta mode performance will hurt because there is less buffer to
use.

Another significant impact I am sure about is some power saving
features will be turned off once apsta mode is enabled. So the chip
will drain more power even the AP interface is not created.

Regards,
- Franky


>
> I would hope that somebody from Infineon could chime in here, as I am
> not privy to the FW design.
>
> Kind regards,
> Alvin
>
> >
> > Regards,
> > - Franky
> >
> > >         /* set mpc */
> > >         err =3D brcmf_fil_iovar_int_set(ifp, "mpc", 1);
> > >         if (err) {
> > > --
> > > 2.37.0
> > >
> >
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