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References: <20220928092223.22673-1-ian.lin@infineon.com> <20220928092223.22673-2-ian.lin@infineon.com>
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From:   Franky Lin <franky.lin@broadcom.com>
Date:   Wed, 28 Sep 2022 09:39:31 -0700
Message-ID: <CA+8PC_d7rs2gj2_gP9u_fSNbTSuFOQt6xFHwbQBXuo9AjTsDdg@mail.gmail.com>
Subject: Re: [PATCH v2 1/4] brcmfmac: Add dump_survey cfg80211 ops for HostApd AutoChannelSelection
To:     Ian Lin <ian.lin@infineon.com>
Cc:     linux-wireless@vger.kernel.org, brcm80211-dev-list@broadcom.com,
        brcm80211-dev-list@cypress.com, hante.meuleman@broadcom.com,
        kvalo@kernel.org, Double.Lo@infineon.com
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On Wed, Sep 28, 2022 at 2:22 AM Ian Lin <ian.lin@infineon.com> wrote:
>
> From: Wright Feng <wright.feng@cypress.com>
>
> To enable ACS feature in Hostap daemon, dump_survey cfg80211 ops and dump
> obss survey command in firmware side are needed. This patch is for adding
> dump_survey feature and adding DUMP_OBSS feature flag to check if
> firmware supports dump_obss iovar.
>
> Signed-off-by: Wright Feng <wright.feng@cypress.com>
> Signed-off-by: Chi-hsien Lin <chi-hsien.lin@cypress.com>
> Signed-off-by: Ian Lin <ian.lin@infineon.com>
> ---
>  .../broadcom/brcm80211/brcmfmac/cfg80211.c    | 256 ++++++++++++++++++
>  .../broadcom/brcm80211/brcmfmac/feature.c     |   3 +-
>  .../broadcom/brcm80211/brcmfmac/feature.h     |   4 +-
>  3 files changed, 261 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> index 42068145a447..f16dad462eb2 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> @@ -88,9 +88,39 @@
>
>  #define BRCMF_PS_MAX_TIMEOUT_MS                2000
>
> +/* Dump obss definitions */
> +#define ACS_MSRMNT_DELAY               100
> +#define CHAN_NOISE_DUMMY               (-80)
> +#define OBSS_TOKEN_IDX                 15
> +#define IBSS_TOKEN_IDX                 15
> +#define TX_TOKEN_IDX                   14
> +#define CTG_TOKEN_IDX                  13
> +#define PKT_TOKEN_IDX                  15
> +#define IDLE_TOKEN_IDX                 12
> +
>  #define BRCMF_ASSOC_PARAMS_FIXED_SIZE \
>         (sizeof(struct brcmf_assoc_params_le) - sizeof(u16))
>
> +struct brcmf_dump_survey {
> +       u32 obss;
> +       u32 ibss;
> +       u32 no_ctg;
> +       u32 no_pckt;
> +       u32 tx;
> +       u32 idle;
> +};
> +
> +struct cca_stats_n_flags {
> +       u32 msrmnt_time; /* Time for Measurement (msec) */
> +       u32 msrmnt_done; /* flag set when measurement complete */
> +       char buf[1];
> +};
> +
> +struct cca_msrmnt_query {
> +       u32 msrmnt_query;
> +       u32 time_req;
> +};
> +
>  static bool check_vif_up(struct brcmf_cfg80211_vif *vif)
>  {
>         if (!test_bit(BRCMF_VIF_STATUS_READY, &vif->sme_state)) {
> @@ -7549,6 +7579,229 @@ static s32 brcmf_translate_country_code(struct brcmf_pub *drvr, char alpha2[2],
>         return 0;
>  }
>
> +static int
> +brcmf_parse_dump_obss(char *buf, struct brcmf_dump_survey *survey)
> +{
> +       int i;
> +       char *token;
> +       char delim[] = "\n ";
> +       unsigned long val;
> +       int err = 0;
> +
> +       token = strsep(&buf, delim);
> +       while (token) {
> +               if (!strcmp(token, "OBSS")) {
> +                       for (i = 0; i < OBSS_TOKEN_IDX; i++)
> +                               token = strsep(&buf, delim);
> +                       err = kstrtoul(token, 10, &val);
> +                       if (err)
> +                               break;
> +                       survey->obss = val;
> +               }
> +
> +               if (!strcmp(token, "IBSS")) {
> +                       for (i = 0; i < IBSS_TOKEN_IDX; i++)
> +                               token = strsep(&buf, delim);
> +                       err = kstrtoul(token, 10, &val);
> +                       if (err)
> +                               break;
> +                       survey->ibss = val;
> +               }
> +
> +               if (!strcmp(token, "TXDur")) {
> +                       for (i = 0; i < TX_TOKEN_IDX; i++)
> +                               token = strsep(&buf, delim);
> +                       err = kstrtoul(token, 10, &val);
> +                       if (err)
> +                               break;
> +                       survey->tx = val;
> +               }
> +
> +               if (!strcmp(token, "Category")) {
> +                       for (i = 0; i < CTG_TOKEN_IDX; i++)
> +                               token = strsep(&buf, delim);
> +                       err = kstrtoul(token, 10, &val);
> +                       if (err)
> +                               break;
> +                       survey->no_ctg = val;
> +               }
> +
> +               if (!strcmp(token, "Packet")) {
> +                       for (i = 0; i < PKT_TOKEN_IDX; i++)
> +                               token = strsep(&buf, delim);
> +                       err = kstrtoul(token, 10, &val);
> +                       if (err)
> +                               break;
> +                       survey->no_pckt = val;
> +               }
> +
> +               if (!strcmp(token, "Opp(time):")) {
> +                       for (i = 0; i < IDLE_TOKEN_IDX; i++)
> +                               token = strsep(&buf, delim);
> +                       err = kstrtoul(token, 10, &val);
> +                       if (err)
> +                               break;
> +                       survey->idle = val;
> +               }
> +
> +               token = strsep(&buf, delim);
> +       }
> +
> +       return err;
> +}
> +
> +static int
> +brcmf_dump_obss(struct brcmf_if *ifp, struct cca_msrmnt_query req,
> +               struct brcmf_dump_survey *survey)
> +{
> +       struct cca_stats_n_flags *results;
> +       char *buf;
> +       int err;
> +
> +       buf = kzalloc(sizeof(char) * BRCMF_DCMD_MEDLEN, GFP_KERNEL);
> +       if (unlikely(!buf)) {
> +               brcmf_err("%s: buf alloc failed\n", __func__);
> +               return -ENOMEM;
> +       }
> +
> +       memcpy(buf, &req, sizeof(struct cca_msrmnt_query));
> +       err = brcmf_fil_iovar_data_get(ifp, "dump_obss",
> +                                      buf, BRCMF_DCMD_MEDLEN);
> +       if (err < 0) {
> +               brcmf_err("dump_obss error (%d)\n", err);
> +               goto exit;
> +       }
> +       results = (struct cca_stats_n_flags *)(buf);
> +
> +       if (req.msrmnt_query)
> +               brcmf_parse_dump_obss(results->buf, survey);
> +
> +       kfree(buf);
> +       return 0;
> +exit:
> +       kfree(buf);
> +       return -EINVAL;
> +}
> +
> +static s32
> +cfg80211_set_channel(struct wiphy *wiphy, struct net_device *dev,
> +                    struct ieee80211_channel *chan,
> +                    enum nl80211_channel_type channel_type)
> +{
> +       u16 chspec = 0;
> +       int err = 0;
> +       struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
> +       struct brcmf_if *ifp = netdev_priv(cfg_to_ndev(cfg));
> +
> +       /* set_channel */
> +       chspec = channel_to_chanspec(&cfg->d11inf, chan);
> +       if (chspec != INVCHANSPEC) {
> +               err = brcmf_fil_iovar_int_set(ifp, "chanspec", chspec);
> +               if (err) {
> +                       err = -EINVAL;
> +                       brcmf_err("set chanspec 0x%04x fail\n", chspec);

Why not also print the original err before overwriting it.

> +               }
> +       } else {
> +               brcmf_err("failed to convert host chanspec to fw chanspec\n");
> +               err = -EINVAL;
> +       }
> +
> +       return err;
> +}
> +
> +static int
> +brcmf_cfg80211_dump_survey(struct wiphy *wiphy, struct net_device *ndev,
> +                          int idx, struct survey_info *info)
> +{
> +       struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
> +       struct brcmf_if *ifp = netdev_priv(cfg_to_ndev(cfg));
> +       struct brcmf_dump_survey survey = {};
> +       struct ieee80211_supported_band *band;
> +       struct ieee80211_channel *chan;
> +       struct cca_msrmnt_query req;
> +       u32 val, noise;
> +       int err;
> +
> +       brcmf_dbg(TRACE, "Enter: channel idx=%d\n", idx);
> +
> +       band = wiphy->bands[NL80211_BAND_2GHZ];
> +       if (band && idx >= band->n_channels) {
> +               idx -= band->n_channels;
> +               band = NULL;
> +       }
> +
> +       if (!band || idx >= band->n_channels) {
> +               band = wiphy->bands[NL80211_BAND_5GHZ];
> +               if (idx >= band->n_channels)
> +                       return -ENOENT;
> +       }
> +
> +       /* Setting current channel to the requested channel */
> +       chan = &band->channels[idx];
> +       err = cfg80211_set_channel(wiphy, ndev, chan, NL80211_CHAN_HT20);
> +       if (err) {
> +               info->channel = chan;
> +               info->filled = 0;
> +               return 0;
> +       }
> +
> +       if (!idx) {
> +               /* Disable mpc */
> +               val = 0;
> +               brcmf_set_mpc(ifp, val);
> +               /* Set interface up, explicitly. */
> +               val = 1;
> +               err = brcmf_fil_cmd_int_set(ifp, BRCMF_C_UP, val);
> +               if (err) {
> +                       brcmf_err("BRCMF_C_UP error (%d)\n", err);
> +                       return -EIO;
> +               }
> +       }
> +
> +       /* Get noise value */
> +       err = brcmf_fil_cmd_int_get(ifp, BRCMF_C_GET_PHY_NOISE, &noise);
> +       if (err) {
> +               brcmf_err("Get Phy Noise failed, error = %d\n", err);
> +               noise = CHAN_NOISE_DUMMY;
> +       }
> +
> +       /* Start Measurement for obss stats on current channel */
> +       req.msrmnt_query = 0;
> +       req.time_req = ACS_MSRMNT_DELAY;
> +       err = brcmf_dump_obss(ifp, req, &survey);
> +       if (err)
> +               goto exit;
> +
> +       /* Add 10 ms for IOVAR completion */
> +       msleep(ACS_MSRMNT_DELAY + 10);
> +
> +       /* Issue IOVAR to collect measurement results */
> +       req.msrmnt_query = 1;
> +       err = brcmf_dump_obss(ifp, req, &survey);
> +       if (err < 0)
> +               goto exit;
> +
> +       info->channel = chan;
> +       info->noise = noise;
> +       info->time = ACS_MSRMNT_DELAY;
> +       info->time_busy = ACS_MSRMNT_DELAY - survey.idle;
> +       info->time_rx = survey.obss + survey.ibss + survey.no_ctg +
> +               survey.no_pckt;
> +       info->time_tx = survey.tx;
> +       info->filled = SURVEY_INFO_NOISE_DBM | SURVEY_INFO_TIME |
> +               SURVEY_INFO_TIME_BUSY | SURVEY_INFO_TIME_RX |
> +               SURVEY_INFO_TIME_TX;
> +
> +       brcmf_dbg(INFO, "OBSS dump: channel %d: survey duraion %d\n",

s/duraion/duration

> +                 ieee80211_frequency_to_channel(chan->center_freq),
> +                 ACS_MSRMNT_DELAY);
> +       brcmf_dbg(INFO, "noise(%d) busy(%llu) rx(%llu) tx(%llu)\n",
> +                 info->noise, info->time_busy, info->time_rx, info->time_tx);
> +
> +exit:
> +       return err;
> +}
> +
>  static void brcmf_cfg80211_reg_notifier(struct wiphy *wiphy,
>                                         struct regulatory_request *req)
>  {
> @@ -7700,6 +7953,9 @@ struct brcmf_cfg80211_info *brcmf_cfg80211_attach(struct brcmf_pub *drvr,
>         if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_WOWL_GTK))
>                 ops->set_rekey_data = brcmf_cfg80211_set_rekey_data;
>  #endif
> +       if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_DUMP_OBSS))
> +               ops->dump_survey = brcmf_cfg80211_dump_survey;
> +
>         err = wiphy_register(wiphy);
>         if (err < 0) {
>                 bphy_err(drvr, "Could not register wiphy device (%d)\n", err);
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/feature.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/feature.c
> index 2c2f3e026c13..10bac865d724 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/feature.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/feature.c
> @@ -143,7 +143,7 @@ static void brcmf_feat_iovar_int_get(struct brcmf_if *ifp,
>         ifp->fwil_fwerr = true;
>
>         err = brcmf_fil_iovar_int_get(ifp, name, &data);
> -       if (err == 0) {
> +       if (err != -BRCMF_FW_UNSUPPORTED) {
>                 brcmf_dbg(INFO, "enabling feature: %s\n", brcmf_feat_names[id]);
>                 ifp->drvr->feat_flags |= BIT(id);
>         } else {
> @@ -281,6 +281,7 @@ void brcmf_feat_attach(struct brcmf_pub *drvr)
>         brcmf_feat_iovar_int_get(ifp, BRCMF_FEAT_RSDB, "rsdb_mode");
>         brcmf_feat_iovar_int_get(ifp, BRCMF_FEAT_TDLS, "tdls_enable");
>         brcmf_feat_iovar_int_get(ifp, BRCMF_FEAT_MFP, "mfp");
> +       brcmf_feat_iovar_int_get(ifp, BRCMF_FEAT_DUMP_OBSS, "dump_obss");
>
>         pfn_mac.version = BRCMF_PFN_MACADDR_CFG_VER;
>         err = brcmf_fil_iovar_data_get(ifp, "pfn_macaddr", &pfn_mac,
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/feature.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/feature.h
> index d1f4257af696..f1b086a69d73 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/feature.h
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/feature.h
> @@ -29,6 +29,7 @@
>   * DOT11H: firmware supports 802.11h
>   * SAE: simultaneous authentication of equals
>   * FWAUTH: Firmware authenticator
> + * DUMP_OBSS: Firmware has capable to dump obss info to support ACS
>   */
>  #define BRCMF_FEAT_LIST \
>         BRCMF_FEAT_DEF(MBSS) \
> @@ -51,7 +52,8 @@
>         BRCMF_FEAT_DEF(MONITOR_FMT_HW_RX_HDR) \
>         BRCMF_FEAT_DEF(DOT11H) \
>         BRCMF_FEAT_DEF(SAE) \
> -       BRCMF_FEAT_DEF(FWAUTH)
> +       BRCMF_FEAT_DEF(FWAUTH) \
> +       BRCMF_FEAT_DEF(DUMP_OBSS)
>
>  /*
>   * Quirks:
> --
> 2.25.0
>

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