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Message-ID: <CABZjns40eHSBDn3BVg0+Wc6dBOZjvx9ewty4wyOzE0WGrH6Tjw@mail.gmail.com>
Date: Wed, 15 Mar 2023 01:36:02 +0900
From: Jaewan Kim <jaewan@...gle.com>
To: Michal Kubiak <michal.kubiak@...el.com>
Cc: gregkh@...uxfoundation.org, johannes@...solutions.net,
linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
kernel-team@...roid.com, adelva@...gle.com
Subject: Re: [PATCH v9 1/5] mac80211_hwsim: add PMSR capability support
On Tue, Mar 14, 2023 at 1:52 AM Michal Kubiak <michal.kubiak@...el.com> wrote:
>
> On Mon, Mar 13, 2023 at 07:53:22AM +0000, Jaewan Kim wrote:
> > PMSR (a.k.a. peer measurement) is generalized measurement between two
> > Wi-Fi devices. And currently FTM (a.k.a. fine time measurement or flight
> > time measurement) is the one and only measurement. FTM is measured by
> > RTT (a.k.a. round trip time) of packets between two Wi-Fi devices.
> >
> > Add necessary functionality to allow mac80211_hwsim to be configured with
> > PMSR capability. The capability is mandatory to accept incoming PMSR
> > request because nl80211_pmsr_start() ignores incoming the request without
> > the PMSR capability.
> >
> > In detail, add new mac80211_hwsim attribute HWSIM_ATTR_PMSR_SUPPORT.
> > HWSIM_ATTR_PMSR_SUPPORT is used to set PMSR capability when creating a new
> > radio. To send extra capability details, HWSIM_ATTR_PMSR_SUPPORT can have
> > nested PMSR capability attributes defined in the nl80211.h. Data format is
> > the same as cfg80211_pmsr_capabilities.
> >
> > If HWSIM_ATTR_PMSR_SUPPORT is specified, mac80211_hwsim builds
> > cfg80211_pmsr_capabilities and sets wiphy.pmsr_capa.
> >
> > Signed-off-by: Jaewan Kim <jaewan@...gle.com>
>
> Hi,
>
> Just a few style comments and suggestions.
>
> Thanks,
> Michal
>
> > ---
> > V8 -> V9: Changed to consider unknown PMSR type as error.
> > V7 -> V8: Changed not to send pmsr_capa when adding new radio to limit
> > exporting cfg80211 function to driver.
> > V6 -> V7: Added terms definitions. Removed pr_*() uses.
> > V5 -> V6: Added per change patch history.
> > V4 -> V5: Fixed style for commit messages.
> > V3 -> V4: Added change details for new attribute, and fixed memory leak.
> > V1 -> V3: Initial commit (includes resends).
> > ---
> > drivers/net/wireless/mac80211_hwsim.c | 129 +++++++++++++++++++++++++-
> > drivers/net/wireless/mac80211_hwsim.h | 3 +
> > 2 files changed, 131 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
> > index 4cc4eaf80b14..65868f28a00f 100644
> > --- a/drivers/net/wireless/mac80211_hwsim.c
> > +++ b/drivers/net/wireless/mac80211_hwsim.c
> > @@ -719,6 +719,9 @@ struct mac80211_hwsim_data {
> > /* RSSI in rx status of the receiver */
> > int rx_rssi;
> >
> > + /* only used when pmsr capability is supplied */
> > + struct cfg80211_pmsr_capabilities pmsr_capa;
> > +
> > struct mac80211_hwsim_link_data link_data[IEEE80211_MLD_MAX_NUM_LINKS];
> > };
> >
> > @@ -760,6 +763,34 @@ static const struct genl_multicast_group hwsim_mcgrps[] = {
> >
> > /* MAC80211_HWSIM netlink policy */
> >
> > +static const struct nla_policy
> > +hwsim_ftm_capa_policy[NL80211_PMSR_FTM_CAPA_ATTR_MAX + 1] = {
> > + [NL80211_PMSR_FTM_CAPA_ATTR_ASAP] = { .type = NLA_FLAG },
> > + [NL80211_PMSR_FTM_CAPA_ATTR_NON_ASAP] = { .type = NLA_FLAG },
> > + [NL80211_PMSR_FTM_CAPA_ATTR_REQ_LCI] = { .type = NLA_FLAG },
> > + [NL80211_PMSR_FTM_CAPA_ATTR_REQ_CIVICLOC] = { .type = NLA_FLAG },
> > + [NL80211_PMSR_FTM_CAPA_ATTR_PREAMBLES] = { .type = NLA_U32 },
> > + [NL80211_PMSR_FTM_CAPA_ATTR_BANDWIDTHS] = { .type = NLA_U32 },
> > + [NL80211_PMSR_FTM_CAPA_ATTR_MAX_BURSTS_EXPONENT] = NLA_POLICY_MAX(NLA_U8, 15),
> > + [NL80211_PMSR_FTM_CAPA_ATTR_MAX_FTMS_PER_BURST] = NLA_POLICY_MAX(NLA_U8, 31),
> > + [NL80211_PMSR_FTM_CAPA_ATTR_TRIGGER_BASED] = { .type = NLA_FLAG },
> > + [NL80211_PMSR_FTM_CAPA_ATTR_NON_TRIGGER_BASED] = { .type = NLA_FLAG },
> > +};
> > +
> > +static const struct nla_policy
> > +hwsim_pmsr_capa_type_policy[NL80211_PMSR_TYPE_MAX + 1] = {
> > + [NL80211_PMSR_TYPE_FTM] = NLA_POLICY_NESTED(hwsim_ftm_capa_policy),
> > +};
> > +
> > +static const struct nla_policy
> > +hwsim_pmsr_capa_policy[NL80211_PMSR_ATTR_MAX + 1] = {
> > + [NL80211_PMSR_ATTR_MAX_PEERS] = { .type = NLA_U32 },
> > + [NL80211_PMSR_ATTR_REPORT_AP_TSF] = { .type = NLA_FLAG },
> > + [NL80211_PMSR_ATTR_RANDOMIZE_MAC_ADDR] = { .type = NLA_FLAG },
> > + [NL80211_PMSR_ATTR_TYPE_CAPA] = NLA_POLICY_NESTED(hwsim_pmsr_capa_type_policy),
> > + [NL80211_PMSR_ATTR_PEERS] = { .type = NLA_REJECT }, // only for request.
> > +};
> > +
> > static const struct nla_policy hwsim_genl_policy[HWSIM_ATTR_MAX + 1] = {
> > [HWSIM_ATTR_ADDR_RECEIVER] = NLA_POLICY_ETH_ADDR_COMPAT,
> > [HWSIM_ATTR_ADDR_TRANSMITTER] = NLA_POLICY_ETH_ADDR_COMPAT,
> > @@ -788,6 +819,7 @@ static const struct nla_policy hwsim_genl_policy[HWSIM_ATTR_MAX + 1] = {
> > [HWSIM_ATTR_IFTYPE_SUPPORT] = { .type = NLA_U32 },
> > [HWSIM_ATTR_CIPHER_SUPPORT] = { .type = NLA_BINARY },
> > [HWSIM_ATTR_MLO_SUPPORT] = { .type = NLA_FLAG },
> > + [HWSIM_ATTR_PMSR_SUPPORT] = NLA_POLICY_NESTED(hwsim_pmsr_capa_policy),
> > };
> >
> > #if IS_REACHABLE(CONFIG_VIRTIO)
> > @@ -3186,6 +3218,7 @@ struct hwsim_new_radio_params {
> > u32 *ciphers;
> > u8 n_ciphers;
> > bool mlo;
> > + const struct cfg80211_pmsr_capabilities *pmsr_capa;
> > };
> >
> > static void hwsim_mcast_config_msg(struct sk_buff *mcast_skb,
> > @@ -3260,7 +3293,7 @@ static int append_radio_msg(struct sk_buff *skb, int id,
> > return ret;
> > }
> >
> > - return 0;
> > + return ret;
> > }
> >
> > static void hwsim_mcast_new_radio(int id, struct genl_info *info,
> > @@ -4445,6 +4478,7 @@ static int mac80211_hwsim_new_radio(struct genl_info *info,
> > NL80211_EXT_FEATURE_MULTICAST_REGISTRATIONS);
> > wiphy_ext_feature_set(hw->wiphy,
> > NL80211_EXT_FEATURE_BEACON_RATE_LEGACY);
> > + wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_ENABLE_FTM_RESPONDER);
> >
> > hw->wiphy->interface_modes = param->iftypes;
> >
> > @@ -4606,6 +4640,11 @@ static int mac80211_hwsim_new_radio(struct genl_info *info,
> > data->debugfs,
> > data, &hwsim_simulate_radar);
> >
> > + if (param->pmsr_capa) {
> > + data->pmsr_capa = *param->pmsr_capa;
> > + hw->wiphy->pmsr_capa = &data->pmsr_capa;
> > + }
> > +
> > spin_lock_bh(&hwsim_radio_lock);
> > err = rhashtable_insert_fast(&hwsim_radios_rht, &data->rht,
> > hwsim_rht_params);
> > @@ -4715,6 +4754,7 @@ static int mac80211_hwsim_get_radio(struct sk_buff *skb,
> > param.regd = data->regd;
> > param.channels = data->channels;
> > param.hwname = wiphy_name(data->hw->wiphy);
> > + param.pmsr_capa = &data->pmsr_capa;
> >
> > res = append_radio_msg(skb, data->idx, ¶m);
> > if (res < 0)
> > @@ -5053,6 +5093,77 @@ static bool hwsim_known_ciphers(const u32 *ciphers, int n_ciphers)
> > return true;
> > }
> >
> > +static int parse_ftm_capa(const struct nlattr *ftm_capa, struct cfg80211_pmsr_capabilities *out,
> > + struct genl_info *info)
> > +{
> > + struct nlattr *tb[NL80211_PMSR_FTM_CAPA_ATTR_MAX + 1];
> > + int ret = nla_parse_nested(tb, NL80211_PMSR_FTM_CAPA_ATTR_MAX,
> > + ftm_capa, hwsim_ftm_capa_policy, NULL);
>
> I would suggest to split declaration and assignment here. It breaks the
> RCT principle and it is more likely to overlook "nla_parse_nested" call.
> I think it would improve the readability when we know that the parsing
> function can return an error.
Thank you for the review, but what's the RCT principle?
I've searched Kernel documentation and also googled it but I couldn't
find a good match.
Could you elaborate on the details?
Most of your comments are related to the RCT, so I'd like to
understand what it is.
>
> > +
> > + if (ret) {
> > + NL_SET_ERR_MSG_ATTR(info->extack, ftm_capa, "malformed FTM capability");
> > + return -EINVAL;
> > + }
> > +
> > + out->ftm.supported = 1;
> > + if (tb[NL80211_PMSR_FTM_CAPA_ATTR_PREAMBLES])
> > + out->ftm.preambles = nla_get_u32(tb[NL80211_PMSR_FTM_CAPA_ATTR_PREAMBLES]);
> > + if (tb[NL80211_PMSR_FTM_CAPA_ATTR_BANDWIDTHS])
> > + out->ftm.bandwidths = nla_get_u32(tb[NL80211_PMSR_FTM_CAPA_ATTR_BANDWIDTHS]);
> > + if (tb[NL80211_PMSR_FTM_CAPA_ATTR_MAX_BURSTS_EXPONENT])
> > + out->ftm.max_bursts_exponent =
> > + nla_get_u8(tb[NL80211_PMSR_FTM_CAPA_ATTR_MAX_BURSTS_EXPONENT]);
> > + if (tb[NL80211_PMSR_FTM_CAPA_ATTR_MAX_FTMS_PER_BURST])
> > + out->ftm.max_ftms_per_burst =
> > + nla_get_u8(tb[NL80211_PMSR_FTM_CAPA_ATTR_MAX_FTMS_PER_BURST]);
> > + out->ftm.asap = !!tb[NL80211_PMSR_FTM_CAPA_ATTR_ASAP];
> > + out->ftm.non_asap = !!tb[NL80211_PMSR_FTM_CAPA_ATTR_NON_ASAP];
> > + out->ftm.request_lci = !!tb[NL80211_PMSR_FTM_CAPA_ATTR_REQ_LCI];
> > + out->ftm.request_civicloc = !!tb[NL80211_PMSR_FTM_CAPA_ATTR_REQ_CIVICLOC];
> > + out->ftm.trigger_based = !!tb[NL80211_PMSR_FTM_CAPA_ATTR_TRIGGER_BASED];
> > + out->ftm.non_trigger_based = !!tb[NL80211_PMSR_FTM_CAPA_ATTR_NON_TRIGGER_BASED];
> > +
> > + return 0;
> > +}
> > +
> > +static int parse_pmsr_capa(const struct nlattr *pmsr_capa, struct cfg80211_pmsr_capabilities *out,
> > + struct genl_info *info)
> > +{
> > + struct nlattr *tb[NL80211_PMSR_ATTR_MAX + 1];
> > + struct nlattr *nla;
> > + int size;
> > + int ret = nla_parse_nested(tb, NL80211_PMSR_ATTR_MAX, pmsr_capa,
> > + hwsim_pmsr_capa_policy, NULL);
>
> Ditto.
>
> > +
> > + if (ret) {
> > + NL_SET_ERR_MSG_ATTR(info->extack, pmsr_capa, "malformed PMSR capability");
> > + return -EINVAL;
> > + }
> > +
> > + if (tb[NL80211_PMSR_ATTR_MAX_PEERS])
> > + out->max_peers = nla_get_u32(tb[NL80211_PMSR_ATTR_MAX_PEERS]);
> > + out->report_ap_tsf = !!tb[NL80211_PMSR_ATTR_REPORT_AP_TSF];
> > + out->randomize_mac_addr = !!tb[NL80211_PMSR_ATTR_RANDOMIZE_MAC_ADDR];
> > +
> > + if (!tb[NL80211_PMSR_ATTR_TYPE_CAPA]) {
> > + NL_SET_ERR_MSG_ATTR(info->extack, tb[NL80211_PMSR_ATTR_TYPE_CAPA],
> > + "malformed PMSR type");
> > + return -EINVAL;
> > + }
> > +
> > + nla_for_each_nested(nla, tb[NL80211_PMSR_ATTR_TYPE_CAPA], size) {
> > + switch (nla_type(nla)) {
> > + case NL80211_PMSR_TYPE_FTM:
> > + parse_ftm_capa(nla, out, info);
> > + break;
> > + default:
> > + NL_SET_ERR_MSG_ATTR(info->extack, nla, "unsupported measurement type");
> > + return -EINVAL;
> > + }
> > + }
> > + return 0;
> > +}
> > +
> > static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info)
> > {
> > struct hwsim_new_radio_params param = { 0 };
> > @@ -5173,8 +5284,24 @@ static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info)
> > param.hwname = hwname;
> > }
> >
> > + if (info->attrs[HWSIM_ATTR_PMSR_SUPPORT]) {
> > + struct cfg80211_pmsr_capabilities *pmsr_capa =
> > + kmalloc(sizeof(*pmsr_capa), GFP_KERNEL);
>
> Missing empty line after variable definition.
> BTW, would it not be better to split "pmsr_capa" declaration and
> "kmalloc"? For example:
>
> struct cfg80211_pmsr_capabilities *pmsr_capa;
>
> pmsr_capa = kmalloc(sizeof(*pmsr_capa), GFP_KERNEL);
> if (!pmsr_capa) {
>
> I think it would be more readable and you would not have to break the
> line. Also, in the current version it seems more likely that the memory
> allocation will be overlooked.
>
> > + if (!pmsr_capa) {
> > + ret = -ENOMEM;
> > + goto out_free;
> > + }
> > + ret = parse_pmsr_capa(info->attrs[HWSIM_ATTR_PMSR_SUPPORT], pmsr_capa, info);
> > + if (ret)
> > + goto out_free;
> > + param.pmsr_capa = pmsr_capa;
> > + }
> > +
> > ret = mac80211_hwsim_new_radio(info, ¶m);
> > +
> > +out_free:
> > kfree(hwname);
> > + kfree(param.pmsr_capa);
> > return ret;
> > }
> >
> > diff --git a/drivers/net/wireless/mac80211_hwsim.h b/drivers/net/wireless/mac80211_hwsim.h
> > index 527799b2de0f..d10fa7f4853b 100644
> > --- a/drivers/net/wireless/mac80211_hwsim.h
> > +++ b/drivers/net/wireless/mac80211_hwsim.h
> > @@ -142,6 +142,8 @@ enum {
> > * @HWSIM_ATTR_CIPHER_SUPPORT: u32 array of supported cipher types
> > * @HWSIM_ATTR_MLO_SUPPORT: claim MLO support (exact parameters TBD) for
> > * the new radio
> > + * @HWSIM_ATTR_PMSR_SUPPORT: nested attribute used with %HWSIM_CMD_CREATE_RADIO
> > + * to provide peer measurement capabilities. (nl80211_peer_measurement_attrs)
> > * @__HWSIM_ATTR_MAX: enum limit
> > */
> >
> > @@ -173,6 +175,7 @@ enum {
> > HWSIM_ATTR_IFTYPE_SUPPORT,
> > HWSIM_ATTR_CIPHER_SUPPORT,
> > HWSIM_ATTR_MLO_SUPPORT,
> > + HWSIM_ATTR_PMSR_SUPPORT,
> > __HWSIM_ATTR_MAX,
> > };
> > #define HWSIM_ATTR_MAX (__HWSIM_ATTR_MAX - 1)
> > --
> > 2.40.0.rc1.284.g88254d51c5-goog
> >
--
Jaewan Kim (김재완) | Software Engineer in Google Korea |
jaewan@...gle.com | +82-10-2781-5078
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