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[80.56.140.230]) by smtp.gmail.com with ESMTPSA id t16sm1971141eje.109.2021.01.14.05.39.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 14 Jan 2021 05:39:31 -0800 (PST) Subject: Re: [PATCH] brcmfmac: add support for CQM RSSI notifications To: =?UTF-8?Q?Alvin_=c5=a0ipraga?= , Arend van Spriel , Franky Lin , Hante Meuleman , Chi-hsien Lin , Wright Feng , Chung-hsien Hsu , Kalle Valo , "David S. Miller" , Jakub Kicinski Cc: "linux-wireless@vger.kernel.org" , "brcm80211-dev-list.pdl@broadcom.com" , "SHA-cyfmac-dev-list@infineon.com" , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" References: <20210112111253.4176340-1-alsi@bang-olufsen.dk> From: Arend van Spriel Message-ID: Date: Thu, 14 Jan 2021 14:39:29 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: <20210112111253.4176340-1-alsi@bang-olufsen.dk> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000bc8b4f05b8dc62e9" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --000000000000bc8b4f05b8dc62e9 Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 12-01-2021 12:13, 'Alvin =C5=A0ipraga' via BRCM80211-DEV-LIST,PDL wrote: > Add support for CQM RSSI measurement reporting and advertise the > NL80211_EXT_FEATURE_CQM_RSSI_LIST feature. This enables a userspace > supplicant such as iwd to be notified of changes in the RSSI for roaming > and signal monitoring purposes. Needs a bit of rework. See my comments below... > Signed-off-by: Alvin =C5=A0ipraga > --- > .../broadcom/brcm80211/brcmfmac/cfg80211.c | 82 +++++++++++++++++++ > .../broadcom/brcm80211/brcmfmac/cfg80211.h | 6 ++ > .../broadcom/brcm80211/brcmfmac/fwil_types.h | 28 +++++++ > 3 files changed, 116 insertions(+) >=20 > diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c = b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c > index 0ee421f30aa2..21b53bd27f7f 100644 > --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c > +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c > @@ -5196,6 +5196,41 @@ brcmf_cfg80211_mgmt_tx(struct wiphy *wiphy, struct= wireless_dev *wdev, > return err; > } > =20 > +static int brcmf_cfg80211_set_cqm_rssi_range_config(struct wiphy *wiphy, > + struct net_device *ndev, > + s32 rssi_low, s32 rssi_high) > +{ > + struct brcmf_cfg80211_vif *vif; > + struct brcmf_if *ifp; > + int err =3D 0; > + > + brcmf_dbg(TRACE, "low=3D%d high=3D%d", rssi_low, rssi_high); > + > + ifp =3D netdev_priv(ndev); > + vif =3D ifp->vif; > + > + if (rssi_low !=3D vif->cqm_rssi_low || rssi_high !=3D vif->cqm_rssi_hig= h) { > + struct brcmf_rssi_event_le config =3D { > + .rate_limit_msec =3D cpu_to_le32(0), > + .rssi_level_num =3D 2, > + .rssi_levels =3D { > + max_t(s32, rssi_low, S8_MIN), > + min_t(s32, rssi_high, S8_MAX), The type should be s8 iso s32. > + }, > + }; What is the expectation here? The firmware behavior for the above is=20 that you will get an event when the rssi is lower or equal to the level=20 and the previous rssi event was lower or equal to a different level.=20 There is another event RSSI_LQM that would be a better fit although that=20 is not available in every firmware image ("rssi_mon" firmware feature). Another option would be to add a level, ie.: .rssi_levels =3D { max_t(s8, rssi_low, S8_MIN), min_t(s8, rssi_high, S8_MAX - 1), S8_MAX } > + err =3D brcmf_fil_iovar_data_set(ifp, "rssi_event", &config, > + sizeof(config)); > + if (err) { > + err =3D -EINVAL; > + } else { > + vif->cqm_rssi_low =3D rssi_low; > + vif->cqm_rssi_high =3D rssi_high; > + } > + } > + > + return err; > +} > =20 > static int > brcmf_cfg80211_cancel_remain_on_channel(struct wiphy *wiphy, > @@ -5502,6 +5537,7 @@ static struct cfg80211_ops brcmf_cfg80211_ops =3D { > .update_mgmt_frame_registrations =3D > brcmf_cfg80211_update_mgmt_frame_registrations, > .mgmt_tx =3D brcmf_cfg80211_mgmt_tx, > + .set_cqm_rssi_range_config =3D brcmf_cfg80211_set_cqm_rssi_range_config= , > .remain_on_channel =3D brcmf_p2p_remain_on_channel, > .cancel_remain_on_channel =3D brcmf_cfg80211_cancel_remain_on_channel, > .get_channel =3D brcmf_cfg80211_get_channel, > @@ -6137,6 +6173,49 @@ brcmf_notify_mic_status(struct brcmf_if *ifp, > return 0; > } > =20 > +static s32 brcmf_notify_rssi(struct brcmf_if *ifp, > + const struct brcmf_event_msg *e, void *data) align to the opening brace in the line above. > +{ > + struct brcmf_cfg80211_vif *vif =3D ifp->vif; > + struct brcmf_rssi_be *info =3D data; > + s32 rssi, snr, noise; > + s32 low, high, last; > + > + if (e->datalen < sizeof(*info)) { > + brcmf_err("insufficient RSSI event data\n"); > + return 0; > + } > + > + rssi =3D be32_to_cpu(info->rssi); > + snr =3D be32_to_cpu(info->snr); > + noise =3D be32_to_cpu(info->noise); Bit surprised to see this is BE, but it appears to be correct. > + low =3D vif->cqm_rssi_low; > + high =3D vif->cqm_rssi_high; > + last =3D vif->cqm_rssi_last; > + > + brcmf_dbg(TRACE, "rssi=3D%d snr=3D%d noise=3D%d low=3D%d high=3D%d last= =3D%d\n", > + rssi, snr, noise, low, high, last); > + > + if (rssi !=3D last) { Given the firmware behavior I don't think you need this check. > + vif->cqm_rssi_last =3D rssi; > + > + if (rssi <=3D low || rssi =3D=3D 0) { > + brcmf_dbg(INFO, "LOW rssi=3D%d\n", rssi); > + cfg80211_cqm_rssi_notify(ifp->ndev, > + NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, > + rssi, GFP_KERNEL); > + } else if (rssi > high) { > + brcmf_dbg(INFO, "HIGH rssi=3D%d\n", rssi); > + cfg80211_cqm_rssi_notify(ifp->ndev, > + NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, > + rssi, GFP_KERNEL); > + } > + } > + > + return 0; --=20 This electronic communication and the information and any files transmitted= =20 with it, or attached to it, are confidential and are intended solely for=20 the use of the individual or entity to whom it is addressed and may contain= =20 information that is confidential, legally privileged, protected by privacy= =20 laws, or otherwise restricted from disclosure to anyone else. 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