| Message ID | 20210112111253.4176340-1-alsi@bang-olufsen.dk (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | brcmfmac: add support for CQM RSSI notifications | expand |
| Context | Check | Description |
|---|---|---|
| netdev/tree_selection | success | Not a local patch |
On 12-01-2021 12:13, 'Alvin Šipraga' 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 Šipraga <alsi@bang-olufsen.dk> > --- > .../broadcom/brcm80211/brcmfmac/cfg80211.c | 82 +++++++++++++++++++ > .../broadcom/brcm80211/brcmfmac/cfg80211.h | 6 ++ > .../broadcom/brcm80211/brcmfmac/fwil_types.h | 28 +++++++ > 3 files changed, 116 insertions(+) > > 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; > } > > +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 = 0; > + > + brcmf_dbg(TRACE, "low=%d high=%d", rssi_low, rssi_high); > + > + ifp = netdev_priv(ndev); > + vif = ifp->vif; > + > + if (rssi_low != vif->cqm_rssi_low || rssi_high != vif->cqm_rssi_high) { > + struct brcmf_rssi_event_le config = { > + .rate_limit_msec = cpu_to_le32(0), > + .rssi_level_num = 2, > + .rssi_levels = { > + 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 that you will get an event when the rssi is lower or equal to the level and the previous rssi event was lower or equal to a different level. There is another event RSSI_LQM that would be a better fit although that is not available in every firmware image ("rssi_mon" firmware feature). Another option would be to add a level, ie.: .rssi_levels = { max_t(s8, rssi_low, S8_MIN), min_t(s8, rssi_high, S8_MAX - 1), S8_MAX } > + err = brcmf_fil_iovar_data_set(ifp, "rssi_event", &config, > + sizeof(config)); > + if (err) { > + err = -EINVAL; > + } else { > + vif->cqm_rssi_low = rssi_low; > + vif->cqm_rssi_high = rssi_high; > + } > + } > + > + return err; > +} > > static int > brcmf_cfg80211_cancel_remain_on_channel(struct wiphy *wiphy, > @@ -5502,6 +5537,7 @@ static struct cfg80211_ops brcmf_cfg80211_ops = { > .update_mgmt_frame_registrations = > brcmf_cfg80211_update_mgmt_frame_registrations, > .mgmt_tx = brcmf_cfg80211_mgmt_tx, > + .set_cqm_rssi_range_config = brcmf_cfg80211_set_cqm_rssi_range_config, > .remain_on_channel = brcmf_p2p_remain_on_channel, > .cancel_remain_on_channel = brcmf_cfg80211_cancel_remain_on_channel, > .get_channel = brcmf_cfg80211_get_channel, > @@ -6137,6 +6173,49 @@ brcmf_notify_mic_status(struct brcmf_if *ifp, > return 0; > } > > +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 = ifp->vif; > + struct brcmf_rssi_be *info = data; > + s32 rssi, snr, noise; > + s32 low, high, last; > + > + if (e->datalen < sizeof(*info)) { > + brcmf_err("insufficient RSSI event data\n"); > + return 0; > + } > + > + rssi = be32_to_cpu(info->rssi); > + snr = be32_to_cpu(info->snr); > + noise = be32_to_cpu(info->noise); Bit surprised to see this is BE, but it appears to be correct. > + low = vif->cqm_rssi_low; > + high = vif->cqm_rssi_high; > + last = vif->cqm_rssi_last; > + > + brcmf_dbg(TRACE, "rssi=%d snr=%d noise=%d low=%d high=%d last=%d\n", > + rssi, snr, noise, low, high, last); > + > + if (rssi != last) { Given the firmware behavior I don't think you need this check. > + vif->cqm_rssi_last = rssi; > + > + if (rssi <= low || rssi == 0) { > + brcmf_dbg(INFO, "LOW rssi=%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=%d\n", rssi); > + cfg80211_cqm_rssi_notify(ifp->ndev, > + NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, > + rssi, GFP_KERNEL); > + } > + } > + > + return 0;
Hi Arend, Thanks for your comments - I'll prepare a v2 patch. Some comments/justification inline below... On 1/14/21 2:39 PM, Arend van Spriel wrote: > On 12-01-2021 12:13, 'Alvin Šipraga' 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 Šipraga <alsi@bang-olufsen.dk> >> --- >> .../broadcom/brcm80211/brcmfmac/cfg80211.c | 82 +++++++++++++++++++ >> .../broadcom/brcm80211/brcmfmac/cfg80211.h | 6 ++ >> .../broadcom/brcm80211/brcmfmac/fwil_types.h | 28 +++++++ >> 3 files changed, 116 insertions(+) >> >> 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; >> } >> +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 = 0; >> + >> + brcmf_dbg(TRACE, "low=%d high=%d", rssi_low, rssi_high); >> + >> + ifp = netdev_priv(ndev); >> + vif = ifp->vif; >> + >> + if (rssi_low != vif->cqm_rssi_low || rssi_high != >> vif->cqm_rssi_high) { >> + struct brcmf_rssi_event_le config = { >> + .rate_limit_msec = cpu_to_le32(0), >> + .rssi_level_num = 2, >> + .rssi_levels = { >> + max_t(s32, rssi_low, S8_MIN), >> + min_t(s32, rssi_high, S8_MAX), > > The type should be s8 iso s32. The idea was to clamp out-of-bounds rssi_low/rssi_high (s32) values to S8_MIN/S8_MAX rather than casting an s32 to s8 and hoping for the best. But since max_t(s8, x, S8_MIN) will always equal (s8)x, I might as well just do: .rssi_levels = { rssi_low, min_t(s8, rssi_high, S8_MAX - 1), S8_MAX, }, I am inclined to keep it as it was, i.e.: .rssi_levels = { max_t(s32, rssi_low, S8_MIN), min_t(s32, rssi_high, S8_MAX - 1), S8_MAX, }, What do you think? > >> + }, >> + }; > > What is the expectation here? The firmware behavior for the above is > that you will get an event when the rssi is lower or equal to the level > and the previous rssi event was lower or equal to a different level. I think I see what you mean - you're concerned about not getting the "high" event because an RSSI greater than rssi_high will not be less than another level? If the behaviour of the firmware is as you describe then I will add an additional level like you suggested to cover this case. > There is another event RSSI_LQM that would be a better fit although that > is not available in every firmware image ("rssi_mon" firmware feature). > > Another option would be to add a level, ie.: > > .rssi_levels = { > max_t(s8, rssi_low, S8_MIN), > min_t(s8, rssi_high, S8_MAX - 1), > S8_MAX > } > >> + err = brcmf_fil_iovar_data_set(ifp, "rssi_event", &config, >> + sizeof(config)); >> + if (err) { >> + err = -EINVAL; >> + } else { >> + vif->cqm_rssi_low = rssi_low; >> + vif->cqm_rssi_high = rssi_high; >> + } >> + } >> + >> + return err; >> +} >> static int >> brcmf_cfg80211_cancel_remain_on_channel(struct wiphy *wiphy, >> @@ -5502,6 +5537,7 @@ static struct cfg80211_ops brcmf_cfg80211_ops = { >> .update_mgmt_frame_registrations = >> brcmf_cfg80211_update_mgmt_frame_registrations, >> .mgmt_tx = brcmf_cfg80211_mgmt_tx, >> + .set_cqm_rssi_range_config = >> brcmf_cfg80211_set_cqm_rssi_range_config, >> .remain_on_channel = brcmf_p2p_remain_on_channel, >> .cancel_remain_on_channel = >> brcmf_cfg80211_cancel_remain_on_channel, >> .get_channel = brcmf_cfg80211_get_channel, >> @@ -6137,6 +6173,49 @@ brcmf_notify_mic_status(struct brcmf_if *ifp, >> return 0; >> } >> +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. Is it not correct already? The 's' in struct is in the same column as the 'c' in const. I think it just looks wrong because of the '+' in the first column of the diff. > >> +{ >> + struct brcmf_cfg80211_vif *vif = ifp->vif; >> + struct brcmf_rssi_be *info = data; >> + s32 rssi, snr, noise; >> + s32 low, high, last; >> + >> + if (e->datalen < sizeof(*info)) { >> + brcmf_err("insufficient RSSI event data\n"); >> + return 0; >> + } >> + >> + rssi = be32_to_cpu(info->rssi); >> + snr = be32_to_cpu(info->snr); >> + noise = be32_to_cpu(info->noise); > > Bit surprised to see this is BE, but it appears to be correct. > >> + low = vif->cqm_rssi_low; >> + high = vif->cqm_rssi_high; >> + last = vif->cqm_rssi_last; >> + >> + brcmf_dbg(TRACE, "rssi=%d snr=%d noise=%d low=%d high=%d last=%d\n", >> + rssi, snr, noise, low, high, last); >> + >> + if (rssi != last) { > > Given the firmware behavior I don't think you need this check. OK. > >> + vif->cqm_rssi_last = rssi; >> + >> + if (rssi <= low || rssi == 0) { >> + brcmf_dbg(INFO, "LOW rssi=%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=%d\n", rssi); >> + cfg80211_cqm_rssi_notify(ifp->ndev, >> + NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, >> + rssi, GFP_KERNEL); >> + } >> + } >> + >> + return 0; >
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; } +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 = 0; + + brcmf_dbg(TRACE, "low=%d high=%d", rssi_low, rssi_high); + + ifp = netdev_priv(ndev); + vif = ifp->vif; + + if (rssi_low != vif->cqm_rssi_low || rssi_high != vif->cqm_rssi_high) { + struct brcmf_rssi_event_le config = { + .rate_limit_msec = cpu_to_le32(0), + .rssi_level_num = 2, + .rssi_levels = { + max_t(s32, rssi_low, S8_MIN), + min_t(s32, rssi_high, S8_MAX), + }, + }; + + err = brcmf_fil_iovar_data_set(ifp, "rssi_event", &config, + sizeof(config)); + if (err) { + err = -EINVAL; + } else { + vif->cqm_rssi_low = rssi_low; + vif->cqm_rssi_high = rssi_high; + } + } + + return err; +} static int brcmf_cfg80211_cancel_remain_on_channel(struct wiphy *wiphy, @@ -5502,6 +5537,7 @@ static struct cfg80211_ops brcmf_cfg80211_ops = { .update_mgmt_frame_registrations = brcmf_cfg80211_update_mgmt_frame_registrations, .mgmt_tx = brcmf_cfg80211_mgmt_tx, + .set_cqm_rssi_range_config = brcmf_cfg80211_set_cqm_rssi_range_config, .remain_on_channel = brcmf_p2p_remain_on_channel, .cancel_remain_on_channel = brcmf_cfg80211_cancel_remain_on_channel, .get_channel = brcmf_cfg80211_get_channel, @@ -6137,6 +6173,49 @@ brcmf_notify_mic_status(struct brcmf_if *ifp, return 0; } +static s32 brcmf_notify_rssi(struct brcmf_if *ifp, + const struct brcmf_event_msg *e, void *data) +{ + struct brcmf_cfg80211_vif *vif = ifp->vif; + struct brcmf_rssi_be *info = data; + s32 rssi, snr, noise; + s32 low, high, last; + + if (e->datalen < sizeof(*info)) { + brcmf_err("insufficient RSSI event data\n"); + return 0; + } + + rssi = be32_to_cpu(info->rssi); + snr = be32_to_cpu(info->snr); + noise = be32_to_cpu(info->noise); + + low = vif->cqm_rssi_low; + high = vif->cqm_rssi_high; + last = vif->cqm_rssi_last; + + brcmf_dbg(TRACE, "rssi=%d snr=%d noise=%d low=%d high=%d last=%d\n", + rssi, snr, noise, low, high, last); + + if (rssi != last) { + vif->cqm_rssi_last = rssi; + + if (rssi <= low || rssi == 0) { + brcmf_dbg(INFO, "LOW rssi=%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=%d\n", rssi); + cfg80211_cqm_rssi_notify(ifp->ndev, + NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, + rssi, GFP_KERNEL); + } + } + + return 0; +} + static s32 brcmf_notify_vif_event(struct brcmf_if *ifp, const struct brcmf_event_msg *e, void *data) { @@ -6235,6 +6314,7 @@ static void brcmf_register_event_handlers(struct brcmf_cfg80211_info *cfg) brcmf_p2p_notify_action_tx_complete); brcmf_fweh_register(cfg->pub, BRCMF_E_PSK_SUP, brcmf_notify_connect_status); + brcmf_fweh_register(cfg->pub, BRCMF_E_RSSI, brcmf_notify_rssi); } static void brcmf_deinit_priv_mem(struct brcmf_cfg80211_info *cfg) @@ -7169,6 +7249,8 @@ static int brcmf_setup_wiphy(struct wiphy *wiphy, struct brcmf_if *ifp) wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_DFS_OFFLOAD); + wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST); + wiphy_read_of_freq_limits(wiphy); return 0; diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h index 17817cdb5de2..e90a30808c22 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h @@ -213,6 +213,9 @@ struct vif_saved_ie { * @list: linked list. * @mgmt_rx_reg: registered rx mgmt frame types. * @mbss: Multiple BSS type, set if not first AP (not relevant for P2P). + * @cqm_rssi_low: Lower RSSI limit for CQM monitoring + * @cqm_rssi_high: Upper RSSI limit for CQM monitoring + * @cqm_rssi_last: Last RSSI reading for CQM monitoring */ struct brcmf_cfg80211_vif { struct brcmf_if *ifp; @@ -224,6 +227,9 @@ struct brcmf_cfg80211_vif { u16 mgmt_rx_reg; bool mbss; int is_11d; + s32 cqm_rssi_low; + s32 cqm_rssi_high; + s32 cqm_rssi_last; }; /* association inform */ diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h index 2e31cc10c195..ff2ef557f0ea 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h @@ -752,6 +752,34 @@ struct brcmf_assoclist_le { u8 mac[BRCMF_MAX_ASSOCLIST][ETH_ALEN]; }; +/** + * struct brcmf_rssi_be - RSSI threshold event format + * + * @rssi: receive signal strength (in dBm) + * @snr: signal-noise ratio + * @noise: noise (in dBm) + */ +struct brcmf_rssi_be { + __be32 rssi; + __be32 snr; + __be32 noise; +}; + +#define BRCMF_MAX_RSSI_LEVELS 8 + +/** + * struct brcm_rssi_event_le - rssi_event IOVAR format + * + * @rate_limit_msec: RSSI event rate limit + * @rssi_level_num: number of supplied RSSI levels + * @rssi_levels: RSSI levels in ascending order + */ +struct brcmf_rssi_event_le { + __le32 rate_limit_msec; + s8 rssi_level_num; + s8 rssi_levels[BRCMF_MAX_RSSI_LEVELS]; +}; + /** * struct brcmf_wowl_wakeind_le - Wakeup indicators * Note: note both fields contain same information.
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. Signed-off-by: Alvin Šipraga <alsi@bang-olufsen.dk> --- .../broadcom/brcm80211/brcmfmac/cfg80211.c | 82 +++++++++++++++++++ .../broadcom/brcm80211/brcmfmac/cfg80211.h | 6 ++ .../broadcom/brcm80211/brcmfmac/fwil_types.h | 28 +++++++ 3 files changed, 116 insertions(+)