[RFC v2 0/7] cfg80211/mac80211: support defining multiple radios per wiphy

[RFC v2 0/7] cfg80211/mac80211: support defining multiple radios per wiphy

[Felix Fietkau]

The prerequisite for MLO support in cfg80211/mac80211 is that all the links
participating in MLO must be from the same wiphy/ieee80211_hw. To meet this
expectation, some drivers may need to group multiple discrete hardware each
acting as a link in MLO under single wiphy.

With this series, the bands and supported frequencies of each individual
radio are reported to user space. This allows user space to figure out the
limitations of what combination of channels can be used concurrently.

Each mac80211 channel context is assigned to a radio based on radio specific
frequency ranges and interface combinations.

This is loosely based on Karthikeyan Periyasamy's series
"[PATCH 00/13] wifi: Add multi physical hardware iface combination support"
with some differences:

 - a struct wiphy_radio is defined, which holds the frequency ranges and
   a full struct ieee80211_iface_combination array
 - a channel context is explicitly assigned to a radio when created
 - both global and per-radio interface combination limits are checked
   and enforced on channel context assignment

Changes since RFC:
 - replace static per-radio number of channels limit with full ifcomb
   checks
 - remove band bitmask in favor of only using freq ranges

Felix Fietkau (7):
  wifi: nl80211: split helper function from nl80211_put_iface_combinations
  wifi: cfg80211: add support for advertising multiple radios belonging to a wiphy
  wifi: cfg80211: extend interface combination check for multi-radio
  wifi: mac80211: add radio index to ieee80211_chanctx_conf
  wifi: mac80211: extend ifcomb check functions for multi-radio
  wifi: mac80211: move code in ieee80211_link_reserve_chanctx to a helper
  wifi: mac80211: add wiphy radio assignment and validation

 include/net/cfg80211.h       |  40 ++++++-
 include/net/mac80211.h       |   2 +-
 include/uapi/linux/nl80211.h |  48 ++++++++-
 net/mac80211/cfg.c           |   6 +-
 net/mac80211/chan.c          | 228 +++++++++++++++++++++++-------------
 net/mac80211/ibss.c          |   2 +-
 net/mac80211/ieee80211_i.h   |   4 +-
 net/mac80211/iface.c         |   2 +-
 net/mac80211/util.c          | 114 ++++++++++++------
 net/wireless/nl80211.c       | 190 +++++++++++++++++++++---------
 net/wireless/util.c          |  29 ++---
 11 files changed, 481 insertions(+), 184 deletions(-)

base-commit: 5bcd9a0a59953b5ff55ac226f903397319bf7f40
-- 
git-series 0.9.1

[RFC v2 1/7] wifi: nl80211: split helper function from nl80211_put_iface_combinations

[Felix Fietkau]

Create a helper function that puts the data from struct
ieee80211_iface_combination to a nl80211 message.
This will be used for adding per-radio interface combination data.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 net/wireless/nl80211.c | 111 ++++++++++++++++++++++--------------------
 1 file changed, 59 insertions(+), 52 deletions(-)

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 8ff5f79d446a..7b0ba0fff082 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -1622,71 +1622,78 @@ static int nl80211_put_iftypes(struct sk_buff *msg, u32 attr, u16 ifmodes)
 	return -ENOBUFS;
 }
 
-static int nl80211_put_iface_combinations(struct wiphy *wiphy,
-					  struct sk_buff *msg,
-					  bool large)
+static int nl80211_put_ifcomb_data(struct sk_buff *msg, bool large, int idx,
+				   const struct ieee80211_iface_combination *c)
 {
-	struct nlattr *nl_combis;
-	int i, j;
+	struct nlattr *nl_combi, *nl_limits;
+	int i;
 
-	nl_combis = nla_nest_start_noflag(msg,
-					  NL80211_ATTR_INTERFACE_COMBINATIONS);
-	if (!nl_combis)
+	nl_combi = nla_nest_start_noflag(msg, idx);
+	if (!nl_combi)
 		goto nla_put_failure;
 
-	for (i = 0; i < wiphy->n_iface_combinations; i++) {
-		const struct ieee80211_iface_combination *c;
-		struct nlattr *nl_combi, *nl_limits;
+	nl_limits = nla_nest_start_noflag(msg, NL80211_IFACE_COMB_LIMITS);
+	if (!nl_limits)
+		goto nla_put_failure;
 
-		c = &wiphy->iface_combinations[i];
+	for (i = 0; i < c->n_limits; i++) {
+		struct nlattr *nl_limit;
 
-		nl_combi = nla_nest_start_noflag(msg, i + 1);
-		if (!nl_combi)
+		nl_limit = nla_nest_start_noflag(msg, i + 1);
+		if (!nl_limit)
 			goto nla_put_failure;
-
-		nl_limits = nla_nest_start_noflag(msg,
-						  NL80211_IFACE_COMB_LIMITS);
-		if (!nl_limits)
+		if (nla_put_u32(msg, NL80211_IFACE_LIMIT_MAX, c->limits[i].max))
 			goto nla_put_failure;
+		if (nl80211_put_iftypes(msg, NL80211_IFACE_LIMIT_TYPES,
+					c->limits[i].types))
+			goto nla_put_failure;
+		nla_nest_end(msg, nl_limit);
+	}
 
-		for (j = 0; j < c->n_limits; j++) {
-			struct nlattr *nl_limit;
+	nla_nest_end(msg, nl_limits);
 
-			nl_limit = nla_nest_start_noflag(msg, j + 1);
-			if (!nl_limit)
-				goto nla_put_failure;
-			if (nla_put_u32(msg, NL80211_IFACE_LIMIT_MAX,
-					c->limits[j].max))
-				goto nla_put_failure;
-			if (nl80211_put_iftypes(msg, NL80211_IFACE_LIMIT_TYPES,
-						c->limits[j].types))
-				goto nla_put_failure;
-			nla_nest_end(msg, nl_limit);
-		}
+	if (c->beacon_int_infra_match &&
+	    nla_put_flag(msg, NL80211_IFACE_COMB_STA_AP_BI_MATCH))
+		goto nla_put_failure;
+	if (nla_put_u32(msg, NL80211_IFACE_COMB_NUM_CHANNELS,
+			c->num_different_channels) ||
+	    nla_put_u32(msg, NL80211_IFACE_COMB_MAXNUM,
+			c->max_interfaces))
+		goto nla_put_failure;
+	if (large &&
+	    (nla_put_u32(msg, NL80211_IFACE_COMB_RADAR_DETECT_WIDTHS,
+			c->radar_detect_widths) ||
+	     nla_put_u32(msg, NL80211_IFACE_COMB_RADAR_DETECT_REGIONS,
+			c->radar_detect_regions)))
+		goto nla_put_failure;
+	if (c->beacon_int_min_gcd &&
+	    nla_put_u32(msg, NL80211_IFACE_COMB_BI_MIN_GCD,
+			c->beacon_int_min_gcd))
+		goto nla_put_failure;
 
-		nla_nest_end(msg, nl_limits);
+	nla_nest_end(msg, nl_combi);
 
-		if (c->beacon_int_infra_match &&
-		    nla_put_flag(msg, NL80211_IFACE_COMB_STA_AP_BI_MATCH))
-			goto nla_put_failure;
-		if (nla_put_u32(msg, NL80211_IFACE_COMB_NUM_CHANNELS,
-				c->num_different_channels) ||
-		    nla_put_u32(msg, NL80211_IFACE_COMB_MAXNUM,
-				c->max_interfaces))
-			goto nla_put_failure;
-		if (large &&
-		    (nla_put_u32(msg, NL80211_IFACE_COMB_RADAR_DETECT_WIDTHS,
-				c->radar_detect_widths) ||
-		     nla_put_u32(msg, NL80211_IFACE_COMB_RADAR_DETECT_REGIONS,
-				c->radar_detect_regions)))
-			goto nla_put_failure;
-		if (c->beacon_int_min_gcd &&
-		    nla_put_u32(msg, NL80211_IFACE_COMB_BI_MIN_GCD,
-				c->beacon_int_min_gcd))
-			goto nla_put_failure;
+	return 0;
+nla_put_failure:
+	return -ENOBUFS;
+}
 
-		nla_nest_end(msg, nl_combi);
-	}
+static int nl80211_put_iface_combinations(struct wiphy *wiphy,
+					  struct sk_buff *msg,
+					  bool large)
+{
+	struct nlattr *nl_combis;
+	int i;
+
+	nl_combis = nla_nest_start_noflag(msg,
+					  NL80211_ATTR_INTERFACE_COMBINATIONS);
+	if (!nl_combis)
+		goto nla_put_failure;
+
+	for (i = 0; i < wiphy->n_iface_combinations; i++)
+		if (nl80211_put_ifcomb_data(msg, large, i + 1,
+					    &wiphy->iface_combinations[i]))
+			goto nla_put_failure;
 
 	nla_nest_end(msg, nl_combis);
 
-- 
git-series 0.9.1

[RFC v2 2/7] wifi: cfg80211: add support for advertising multiple radios belonging to a wiphy

[Felix Fietkau]

The prerequisite for MLO support in cfg80211/mac80211 is that all the links
participating in MLO must be from the same wiphy/ieee80211_hw. To meet this
expectation, some drivers may need to group multiple discrete hardware each
acting as a link in MLO under single wiphy.
With this change, supported frequencies and interface combinations of each
individual radio are reported to user space.
This allows user space to figure out the limitations of what combination of
channels can be used concurrently.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 include/net/cfg80211.h       | 38 ++++++++++++++++++-
 include/uapi/linux/nl80211.h | 48 ++++++++++++++++++++++-
 net/wireless/nl80211.c       | 79 +++++++++++++++++++++++++++++++++++++-
 3 files changed, 165 insertions(+)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 5da9bb0ac6a4..27355e08ae52 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -5403,6 +5403,38 @@ struct wiphy_iftype_akm_suites {
 	int n_akm_suites;
 };
 
+/**
+ * struct wiphy_radio_freq_range - wiphy frequency range
+ * @start_freq:  start range edge frequency (kHz)
+ * @end_freq:    end range edge frequency (kHz)
+ */
+struct wiphy_radio_freq_range {
+	u32 start_freq;
+	u32 end_freq;
+};
+
+
+/**
+ * struct wiphy_radio - This structure describes a physical radio belonging
+ * to a wiphy. It is used to describe concurrent-channel capabilities of the
+ * phy. Only one channel can be active on the radio described by struct
+ * wiphy_radio.
+ *
+ * @freq_range: frequency range that the radio can operate on.
+ * @n_freq_range: number of elements in @freq_range
+ *
+ * @iface_combinations: Valid interface combinations array, should not
+ *	list single interface types.
+ * @n_iface_combinations: number of entries in @iface_combinations array.
+ */
+struct wiphy_radio {
+	const struct wiphy_radio_freq_range *freq_range;
+	int n_freq_range;
+
+	const struct ieee80211_iface_combination *iface_combinations;
+	int n_iface_combinations;
+};
+
 #define CFG80211_HW_TIMESTAMP_ALL_PEERS	0xffff
 
 /**
@@ -5621,6 +5653,9 @@ struct wiphy_iftype_akm_suites {
  *	A value of %CFG80211_HW_TIMESTAMP_ALL_PEERS indicates the driver
  *	supports enabling HW timestamping for all peers (i.e. no need to
  *	specify a mac address).
+ *
+ * @radio: radios belonging to this wiphy
+ * @n_radio: number of radios
  */
 struct wiphy {
 	struct mutex mtx;
@@ -5771,6 +5806,9 @@ struct wiphy {
 
 	u16 hw_timestamp_max_peers;
 
+	const struct wiphy_radio *radio;
+	int n_radio;
+
 	char priv[] __aligned(NETDEV_ALIGN);
 };
 
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index f917bc6c9b6f..784bf7501d97 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -3401,6 +3401,8 @@ enum nl80211_attrs {
 
 	NL80211_ATTR_ASSOC_SPP_AMSDU,
 
+	NL80211_ATTR_RADIOS,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
@@ -7999,4 +8001,50 @@ enum nl80211_ap_settings_flags {
 	NL80211_AP_SETTINGS_SA_QUERY_OFFLOAD_SUPPORT	= 1 << 1,
 };
 
+/**
+ * enum nl80211_wiphy_radio_attrs - wiphy radio attributes
+ *
+ * @__NL80211_WIPHY_RADIO_ATTR_INVALID: Invalid
+ *
+ * @NL80211_WIPHY_RADIO_ATTR_FREQ_RANGES: Nested array of frequency ranges
+ *	supported by this radio.
+ * @NL80211_WIPHY_RADIO_ATTR_INTERFACE_COMBINATIONS: Nested attribute listing
+ *	the supported interface combinations for this radio. In each nested item,
+ *	it contains attributes defined in &enum nl80211_if_combination_attrs.
+ *
+ * @__NL80211_WIPHY_RADIO_ATTR_LAST: Internal
+ * @NL80211_WIPHY_RADIO_ATTR_MAX: Highest attribute
+ */
+enum nl80211_wiphy_radio_attrs {
+	__NL80211_WIPHY_RADIO_ATTR_INVALID,
+
+	NL80211_WIPHY_RADIO_ATTR_FREQ_RANGES,
+	NL80211_WIPHY_RADIO_ATTR_INTERFACE_COMBINATIONS,
+
+	/* keep last */
+	__NL80211_WIPHY_RADIO_ATTR_LAST,
+	NL80211_WIPHY_RADIO_ATTR_MAX = __NL80211_WIPHY_RADIO_ATTR_LAST - 1,
+};
+
+/**
+ * enum nl80211_wiphy_radio_freq_range - wiphy radio frequency range
+ *
+ * @__NL80211_WIPHY_RADIO_FREQ_ATTR_INVALID: Invalid
+ *
+ * @NL80211_WIPHY_RADIO_FREQ_ATTR_START: Frequency range start
+ * @NL80211_WIPHY_RADIO_FREQ_ATTR_END: Frequency range end
+ *
+ * @__NL80211_WIPHY_RADIO_FREQ_ATTR_LAST: Internal
+ * @NL80211_WIPHY_RADIO_FREQ_ATTR_MAX: Highest attribute
+ */
+enum nl80211_wiphy_radio_freq_range {
+	__NL80211_WIPHY_RADIO_FREQ_ATTR_INVALID,
+
+	NL80211_WIPHY_RADIO_FREQ_ATTR_START,
+	NL80211_WIPHY_RADIO_FREQ_ATTR_END,
+
+	__NL80211_WIPHY_RADIO_FREQ_ATTR_LAST,
+	NL80211_WIPHY_RADIO_FREQ_ATTR_MAX = __NL80211_WIPHY_RADIO_FREQ_ATTR_LAST - 1,
+};
+
 #endif /* __LINUX_NL80211_H */
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 7b0ba0fff082..a8e3a08e908d 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2399,6 +2399,79 @@ static int nl80211_put_mbssid_support(struct wiphy *wiphy, struct sk_buff *msg)
 	return -ENOBUFS;
 }
 
+static int nl80211_put_radio(struct wiphy *wiphy, struct sk_buff *msg, int idx)
+{
+	const struct wiphy_radio *r = &wiphy->radio[idx];
+	struct nlattr *radio, *freqs, *freq, *nl_combis;
+	int i;
+
+	radio = nla_nest_start(msg, idx);
+	if (!radio)
+		return -ENOBUFS;
+
+	freqs = nla_nest_start_noflag(msg, NL80211_WIPHY_RADIO_ATTR_FREQ_RANGES);
+	if (!freqs)
+		goto nla_put_failure;
+
+	for (i = 0; i < r->n_freq_range; i++) {
+		const struct wiphy_radio_freq_range *range = &r->freq_range[i];
+		int ret;
+
+		freq = nla_nest_start(msg, i);
+		ret = nla_put_u32(msg, NL80211_WIPHY_RADIO_FREQ_ATTR_START,
+				  range->start_freq) ||
+		      nla_put_u32(msg, NL80211_WIPHY_RADIO_FREQ_ATTR_END,
+				  range->end_freq);
+		nla_nest_end(msg, freq);
+
+		if (ret)
+			goto nla_put_failure;
+	}
+
+	nla_nest_end(msg, freqs);
+
+	nl_combis = nla_nest_start_noflag(msg,
+					  NL80211_WIPHY_RADIO_ATTR_INTERFACE_COMBINATIONS);
+	if (!nl_combis)
+		goto nla_put_failure;
+
+	for (i = 0; i < r->n_iface_combinations; i++)
+		if (nl80211_put_ifcomb_data(msg, true, i + 1,
+					    &r->iface_combinations[i]))
+			goto nla_put_failure;
+
+	nla_nest_end(msg, nl_combis);
+	nla_nest_end(msg, radio);
+	return 0;
+
+nla_put_failure:
+	return -ENOBUFS;
+}
+
+static int nl80211_put_radios(struct wiphy *wiphy, struct sk_buff *msg)
+{
+	struct nlattr *radios;
+	int i;
+
+	if (!wiphy->n_radio)
+		return 0;
+
+	radios = nla_nest_start(msg, NL80211_ATTR_RADIOS);
+	if (!radios)
+		return -ENOBUFS;
+
+	for (i = 0; i < wiphy->n_radio; i++)
+		if (nl80211_put_radio(wiphy, msg, i))
+			goto fail;
+
+	nla_nest_end(msg, radios);
+	return 0;
+
+fail:
+	nla_nest_cancel(msg, radios);
+	return -ENOBUFS;
+}
+
 struct nl80211_dump_wiphy_state {
 	s64 filter_wiphy;
 	long start;
@@ -3008,6 +3081,12 @@ static int nl80211_send_wiphy(struct cfg80211_registered_device *rdev,
 				rdev->wiphy.hw_timestamp_max_peers))
 			goto nla_put_failure;
 
+		state->split_start++;
+		break;
+	case 17:
+		if (nl80211_put_radios(&rdev->wiphy, msg))
+			goto nla_put_failure;
+
 		/* done */
 		state->split_start = 0;
 		break;
-- 
git-series 0.9.1

[RFC v2 3/7] wifi: cfg80211: extend interface combination check for multi-radio

[Felix Fietkau]

Add a field in struct iface_combination_params to check per-radio
interface combinations instead of per-wiphy ones.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 include/net/cfg80211.h |  2 ++
 net/wireless/util.c    | 29 +++++++++++++++++------------
 2 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 27355e08ae52..c1439ac975d6 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1595,6 +1595,7 @@ struct cfg80211_color_change_settings {
  *
  * Used to pass interface combination parameters
  *
+ * @radio: when set, check radio specific interface combinations.
  * @num_different_channels: the number of different channels we want
  *	to use for verification
  * @radar_detect: a bitmap where each bit corresponds to a channel
@@ -1608,6 +1609,7 @@ struct cfg80211_color_change_settings {
  *	the verification
  */
 struct iface_combination_params {
+	const struct wiphy_radio *radio;
 	int num_different_channels;
 	u8 radar_detect;
 	int iftype_num[NUM_NL80211_IFTYPES];
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 2bde8a354631..fc3e8fbb4cc2 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -2309,9 +2309,6 @@ static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
 {
 	struct wireless_dev *wdev;
 
-	*beacon_int_gcd = 0;
-	*beacon_int_different = false;
-
 	list_for_each_entry(wdev, &wiphy->wdev_list, list) {
 		int wdev_bi;
 
@@ -2366,13 +2363,15 @@ int cfg80211_iter_combinations(struct wiphy *wiphy,
 					    void *data),
 			       void *data)
 {
+	const struct wiphy_radio *radio = params->radio;
+	const struct ieee80211_iface_combination *c;
 	const struct ieee80211_regdomain *regdom;
 	enum nl80211_dfs_regions region = 0;
-	int i, j, iftype;
+	int i, j, n, iftype;
 	int num_interfaces = 0;
 	u32 used_iftypes = 0;
-	u32 beacon_int_gcd;
-	bool beacon_int_different;
+	u32 beacon_int_gcd = 0;
+	bool beacon_int_different = false;
 
 	/*
 	 * This is a bit strange, since the iteration used to rely only on
@@ -2384,8 +2383,10 @@ int cfg80211_iter_combinations(struct wiphy *wiphy,
 	 * cfg80211 already - the only thing not would appear to be any new
 	 * interfaces (while being brought up) and channel/radar data.
 	 */
-	cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
-				   &beacon_int_gcd, &beacon_int_different);
+	if (!radio)
+			cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
+						   &beacon_int_gcd,
+						   &beacon_int_different);
 
 	if (params->radar_detect) {
 		rcu_read_lock();
@@ -2402,13 +2403,17 @@ int cfg80211_iter_combinations(struct wiphy *wiphy,
 			used_iftypes |= BIT(iftype);
 	}
 
-	for (i = 0; i < wiphy->n_iface_combinations; i++) {
-		const struct ieee80211_iface_combination *c;
+	if (radio) {
+		c = radio->iface_combinations;
+		n = radio->n_iface_combinations;
+	} else {
+		c = wiphy->iface_combinations;
+		n = wiphy->n_iface_combinations;
+	}
+	for (i = 0; i < n; i++, c++) {
 		struct ieee80211_iface_limit *limits;
 		u32 all_iftypes = 0;
 
-		c = &wiphy->iface_combinations[i];
-
 		if (num_interfaces > c->max_interfaces)
 			continue;
 		if (params->num_different_channels > c->num_different_channels)
-- 
git-series 0.9.1

Re: [RFC v2 3/7] wifi: cfg80211: extend interface combination check for multi-radio

[Karthikeyan Periyasamy]

On 6/6/2024 12:01 AM, Felix Fietkau wrote:
>   
>   	/*
>   	 * This is a bit strange, since the iteration used to rely only on
> @@ -2384,8 +2383,10 @@ int cfg80211_iter_combinations(struct wiphy *wiphy,
>   	 * cfg80211 already - the only thing not would appear to be any new
>   	 * interfaces (while being brought up) and channel/radar data.
>   	 */
> -	cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
> -				   &beacon_int_gcd, &beacon_int_different);
> +	if (!radio)
> +			cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
> +						   &beacon_int_gcd,
> +						   &beacon_int_different);
>   

Why its avoid for radio specific iface combination ?


-- 
Karthikeyan Periyasamy
--
கார்த்திகேயன் பெரியசாமி

Re: [RFC v2 3/7] wifi: cfg80211: extend interface combination check for multi-radio

[Felix Fietkau]

On 06.06.24 09:20, Karthikeyan Periyasamy wrote:
> 
> 
> On 6/6/2024 12:01 AM, Felix Fietkau wrote:
>>   
>>   	/*
>>   	 * This is a bit strange, since the iteration used to rely only on
>> @@ -2384,8 +2383,10 @@ int cfg80211_iter_combinations(struct wiphy *wiphy,
>>   	 * cfg80211 already - the only thing not would appear to be any new
>>   	 * interfaces (while being brought up) and channel/radar data.
>>   	 */
>> -	cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
>> -				   &beacon_int_gcd, &beacon_int_different);
>> +	if (!radio)
>> +			cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
>> +						   &beacon_int_gcd,
>> +						   &beacon_int_different);
>>   
> 
> Why its avoid for radio specific iface combination ?

Because it iterates over all wdevs within cfg80211. I didn't think this 
was necessary, given that it already excludes MLO wdevs.

- Felix

Re: [RFC v2 3/7] wifi: cfg80211: extend interface combination check for multi-radio

[Karthikeyan Periyasamy]

On 6/6/2024 1:25 PM, Felix Fietkau wrote:
> On 06.06.24 09:20, Karthikeyan Periyasamy wrote:
>>
>>
>> On 6/6/2024 12:01 AM, Felix Fietkau wrote:
>>>       /*
>>>        * This is a bit strange, since the iteration used to rely only on
>>> @@ -2384,8 +2383,10 @@ int cfg80211_iter_combinations(struct wiphy 
>>> *wiphy,
>>>        * cfg80211 already - the only thing not would appear to be any 
>>> new
>>>        * interfaces (while being brought up) and channel/radar data.
>>>        */
>>> -    cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
>>> -                   &beacon_int_gcd, &beacon_int_different);
>>> +    if (!radio)
>>> +            cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
>>> +                           &beacon_int_gcd,
>>> +                           &beacon_int_different);
>>
>> Why its avoid for radio specific iface combination ?
> 
> Because it iterates over all wdevs within cfg80211. I didn't think this 
> was necessary, given that it already excludes MLO wdevs.
> 

Dont tie the radio specific iface advertisement with MLO.

Usually the existing code consider "params->new_beacon_int" the MLO 
scenario also.

-- 
Karthikeyan Periyasamy
--
கார்த்திகேயன் பெரியசாமி

Re: [RFC v2 3/7] wifi: cfg80211: extend interface combination check for multi-radio

[Felix Fietkau]

On 06.06.24 10:56, Karthikeyan Periyasamy wrote:
> 
> 
> On 6/6/2024 1:25 PM, Felix Fietkau wrote:
>> On 06.06.24 09:20, Karthikeyan Periyasamy wrote:
>>>
>>>
>>> On 6/6/2024 12:01 AM, Felix Fietkau wrote:
>>>>       /*
>>>>        * This is a bit strange, since the iteration used to rely only on
>>>> @@ -2384,8 +2383,10 @@ int cfg80211_iter_combinations(struct wiphy 
>>>> *wiphy,
>>>>        * cfg80211 already - the only thing not would appear to be any 
>>>> new
>>>>        * interfaces (while being brought up) and channel/radar data.
>>>>        */
>>>> -    cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
>>>> -                   &beacon_int_gcd, &beacon_int_different);
>>>> +    if (!radio)
>>>> +            cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
>>>> +                           &beacon_int_gcd,
>>>> +                           &beacon_int_different);
>>>
>>> Why its avoid for radio specific iface combination ?
>> 
>> Because it iterates over all wdevs within cfg80211. I didn't think this 
>> was necessary, given that it already excludes MLO wdevs.
>> 
> 
> Dont tie the radio specific iface advertisement with MLO.
> 
> Usually the existing code consider "params->new_beacon_int" the MLO
> scenario also.

For your hardware, do beacon intervals need to be matched/aligned per 
radio or globally?

- Felix

Re: [RFC v2 3/7] wifi: cfg80211: extend interface combination check for multi-radio

[Karthikeyan Periyasamy]

On 6/6/2024 2:28 PM, Felix Fietkau wrote:
> On 06.06.24 10:56, Karthikeyan Periyasamy wrote:
>>
>>
>> On 6/6/2024 1:25 PM, Felix Fietkau wrote:
>>> On 06.06.24 09:20, Karthikeyan Periyasamy wrote:
>>>>
>>>>
>>>> On 6/6/2024 12:01 AM, Felix Fietkau wrote:
>>>>>       /*
>>>>>        * This is a bit strange, since the iteration used to rely 
>>>>> only on
>>>>> @@ -2384,8 +2383,10 @@ int cfg80211_iter_combinations(struct wiphy 
>>>>> *wiphy,
>>>>>        * cfg80211 already - the only thing not would appear to be 
>>>>> any new
>>>>>        * interfaces (while being brought up) and channel/radar data.
>>>>>        */
>>>>> -    cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
>>>>> -                   &beacon_int_gcd, &beacon_int_different);
>>>>> +    if (!radio)
>>>>> +            cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
>>>>> +                           &beacon_int_gcd,
>>>>> +                           &beacon_int_different);
>>>>
>>>> Why its avoid for radio specific iface combination ?
>>>
>>> Because it iterates over all wdevs within cfg80211. I didn't think 
>>> this was necessary, given that it already excludes MLO wdevs.
>>>
>>
>> Dont tie the radio specific iface advertisement with MLO.
>>
>> Usually the existing code consider "params->new_beacon_int" the MLO
>> scenario also.
> 
> For your hardware, do beacon intervals need to be matched/aligned per 
> radio or globally?
> 

Our hardware supports radio aligned beacon interval.

Currently, ath12k use use same beacon interval configuration all radio 
iface combination.

Even in radio specific iface combination, we should check the beacon 
interval for the non MLO VAPs.

so dont avoid the beacon interval check.

-- 
Karthikeyan Periyasamy
--
கார்த்திகேயன் பெரியசாமி

Re: [RFC v2 3/7] wifi: cfg80211: extend interface combination check for multi-radio

[Felix Fietkau]

On 06.06.24 11:52, Karthikeyan Periyasamy wrote:
> 
> 
> On 6/6/2024 2:28 PM, Felix Fietkau wrote:
>> On 06.06.24 10:56, Karthikeyan Periyasamy wrote:
>>>
>>>
>>> On 6/6/2024 1:25 PM, Felix Fietkau wrote:
>>>> On 06.06.24 09:20, Karthikeyan Periyasamy wrote:
>>>>>
>>>>>
>>>>> On 6/6/2024 12:01 AM, Felix Fietkau wrote:
>>>>>>       /*
>>>>>>        * This is a bit strange, since the iteration used to rely 
>>>>>> only on
>>>>>> @@ -2384,8 +2383,10 @@ int cfg80211_iter_combinations(struct wiphy 
>>>>>> *wiphy,
>>>>>>        * cfg80211 already - the only thing not would appear to be 
>>>>>> any new
>>>>>>        * interfaces (while being brought up) and channel/radar data.
>>>>>>        */
>>>>>> -    cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
>>>>>> -                   &beacon_int_gcd, &beacon_int_different);
>>>>>> +    if (!radio)
>>>>>> +            cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
>>>>>> +                           &beacon_int_gcd,
>>>>>> +                           &beacon_int_different);
>>>>>
>>>>> Why its avoid for radio specific iface combination ?
>>>>
>>>> Because it iterates over all wdevs within cfg80211. I didn't think 
>>>> this was necessary, given that it already excludes MLO wdevs.
>>>>
>>>
>>> Dont tie the radio specific iface advertisement with MLO.
>>>
>>> Usually the existing code consider "params->new_beacon_int" the MLO
>>> scenario also.
>> 
>> For your hardware, do beacon intervals need to be matched/aligned per 
>> radio or globally?
>> 
> 
> Our hardware supports radio aligned beacon interval.
> 
> Currently, ath12k use use same beacon interval configuration all radio
> iface combination.
> 
> Even in radio specific iface combination, we should check the beacon
> interval for the non MLO VAPs.
> 
> so dont avoid the beacon interval check.

Okay, I'll look into making this work.

- Felix

[RFC v2 4/7] wifi: mac80211: add radio index to ieee80211_chanctx_conf

[Felix Fietkau]

Will be used to explicitly assign a channel context to a wiphy radio.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 include/net/mac80211.h | 2 ++
 net/mac80211/chan.c    | 8 +++++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index ecfa65ade226..98394970c991 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -250,6 +250,7 @@ struct ieee80211_chan_req {
  * @min_def: the minimum channel definition currently required.
  * @ap: the channel definition the AP actually is operating as,
  *	for use with (wider bandwidth) OFDMA
+ * @radio_idx: index of the wiphy radio used used for this channel
  * @rx_chains_static: The number of RX chains that must always be
  *	active on the channel to receive MIMO transmissions
  * @rx_chains_dynamic: The number of RX chains that must be enabled
@@ -264,6 +265,7 @@ struct ieee80211_chanctx_conf {
 	struct cfg80211_chan_def min_def;
 	struct cfg80211_chan_def ap;
 
+	int radio_idx;
 	u8 rx_chains_static, rx_chains_dynamic;
 
 	bool radar_enabled;
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index ec16d7676088..574ae961a7cf 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -638,7 +638,8 @@ ieee80211_chanctx_radar_required(struct ieee80211_local *local,
 static struct ieee80211_chanctx *
 ieee80211_alloc_chanctx(struct ieee80211_local *local,
 			const struct ieee80211_chan_req *chanreq,
-			enum ieee80211_chanctx_mode mode)
+			enum ieee80211_chanctx_mode mode,
+			int radio_idx)
 {
 	struct ieee80211_chanctx *ctx;
 
@@ -656,6 +657,7 @@ ieee80211_alloc_chanctx(struct ieee80211_local *local,
 	ctx->conf.rx_chains_dynamic = 1;
 	ctx->mode = mode;
 	ctx->conf.radar_enabled = false;
+	ctx->conf.radio_idx = radio_idx;
 	_ieee80211_recalc_chanctx_min_def(local, ctx, NULL);
 
 	return ctx;
@@ -696,7 +698,7 @@ ieee80211_new_chanctx(struct ieee80211_local *local,
 
 	lockdep_assert_wiphy(local->hw.wiphy);
 
-	ctx = ieee80211_alloc_chanctx(local, chanreq, mode);
+	ctx = ieee80211_alloc_chanctx(local, chanreq, mode, -1);
 	if (!ctx)
 		return ERR_PTR(-ENOMEM);
 
@@ -1126,7 +1128,7 @@ int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link,
 			    !list_empty(&curr_ctx->reserved_links))
 				return -EBUSY;
 
-			new_ctx = ieee80211_alloc_chanctx(local, chanreq, mode);
+			new_ctx = ieee80211_alloc_chanctx(local, chanreq, mode, -1);
 			if (!new_ctx)
 				return -ENOMEM;
 
-- 
git-series 0.9.1

[RFC v2 5/7] wifi: mac80211: extend ifcomb check functions for multi-radio

[Felix Fietkau]

Add support for counting global and per-radio max/current number of
channels, as well as checking radio-specific interface combinations.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 net/mac80211/cfg.c         |   6 +-
 net/mac80211/chan.c        |  17 +++---
 net/mac80211/ibss.c        |   2 +-
 net/mac80211/ieee80211_i.h |   4 +-
 net/mac80211/iface.c       |   2 +-
 net/mac80211/util.c        | 114 ++++++++++++++++++++++++++------------
 6 files changed, 98 insertions(+), 47 deletions(-)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 62119e957cd8..561a36506b02 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -263,7 +263,7 @@ static int ieee80211_start_p2p_device(struct wiphy *wiphy,
 
 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 
-	ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
+	ret = ieee80211_check_combinations(sdata, NULL, 0, 0, -1);
 	if (ret < 0)
 		return ret;
 
@@ -285,7 +285,7 @@ static int ieee80211_start_nan(struct wiphy *wiphy,
 
 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 
-	ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
+	ret = ieee80211_check_combinations(sdata, NULL, 0, 0, -1);
 	if (ret < 0)
 		return ret;
 
@@ -4001,7 +4001,7 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
 		goto out;
 
 	/* if reservation is invalid then this will fail */
-	err = ieee80211_check_combinations(sdata, NULL, chanctx->mode, 0);
+	err = ieee80211_check_combinations(sdata, NULL, chanctx->mode, 0, -1);
 	if (err) {
 		ieee80211_link_unreserve_chanctx(link_data);
 		goto out;
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index 574ae961a7cf..0e899c07bc2b 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -47,24 +47,29 @@ int ieee80211_chanctx_refcount(struct ieee80211_local *local,
 	       ieee80211_chanctx_num_reserved(local, ctx);
 }
 
-static int ieee80211_num_chanctx(struct ieee80211_local *local)
+static int ieee80211_num_chanctx(struct ieee80211_local *local, int radio_idx)
 {
 	struct ieee80211_chanctx *ctx;
 	int num = 0;
 
 	lockdep_assert_wiphy(local->hw.wiphy);
 
-	list_for_each_entry(ctx, &local->chanctx_list, list)
+	list_for_each_entry(ctx, &local->chanctx_list, list) {
+		if (radio_idx >= 0 && ctx->conf.radio_idx != radio_idx)
+			continue;
 		num++;
+	}
 
 	return num;
 }
 
-static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local)
+static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local,
+					     int radio_idx)
 {
 	lockdep_assert_wiphy(local->hw.wiphy);
 
-	return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local);
+	return ieee80211_num_chanctx(local, radio_idx) <
+	       ieee80211_max_num_channels(local, radio_idx);
 }
 
 static struct ieee80211_chanctx *
@@ -1072,7 +1077,7 @@ int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link,
 
 	new_ctx = ieee80211_find_reservation_chanctx(local, chanreq, mode);
 	if (!new_ctx) {
-		if (ieee80211_can_create_new_chanctx(local)) {
+		if (ieee80211_can_create_new_chanctx(local, -1)) {
 			new_ctx = ieee80211_new_chanctx(local, chanreq, mode,
 							false);
 			if (IS_ERR(new_ctx))
@@ -1767,7 +1772,7 @@ int _ieee80211_link_use_channel(struct ieee80211_link_data *link,
 	link->radar_required = ret;
 
 	ret = ieee80211_check_combinations(sdata, &chanreq->oper, mode,
-					   radar_detect_width);
+					   radar_detect_width, -1);
 	if (ret < 0)
 		goto out;
 
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index bf338f3d4dd3..522e964bb186 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -1745,7 +1745,7 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
 		IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE;
 
 	ret = ieee80211_check_combinations(sdata, &params->chandef, chanmode,
-					   radar_detect_width);
+					   radar_detect_width, -1);
 	if (ret < 0)
 		return ret;
 
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 3fd7b1adbfab..5915181251f4 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -2620,8 +2620,8 @@ void ieee80211_recalc_dtim(struct ieee80211_local *local,
 int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
 				 const struct cfg80211_chan_def *chandef,
 				 enum ieee80211_chanctx_mode chanmode,
-				 u8 radar_detect);
-int ieee80211_max_num_channels(struct ieee80211_local *local);
+				 u8 radar_detect, int radio_idx);
+int ieee80211_max_num_channels(struct ieee80211_local *local, int radio_idx);
 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
 				       struct ieee80211_chanctx *ctx);
 
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index d1a49ee4a194..5dc85f9409cd 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -397,7 +397,7 @@ static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 		}
 	}
 
-	return ieee80211_check_combinations(sdata, NULL, 0, 0);
+	return ieee80211_check_combinations(sdata, NULL, 0, 0, -1);
 }
 
 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 927f752a0209..e3046585b7b9 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -3928,13 +3928,81 @@ static u8 ieee80211_chanctx_radar_detect(struct ieee80211_local *local,
 	return radar_detect;
 }
 
+static bool
+ieee80211_sdata_uses_radio(struct ieee80211_sub_if_data *sdata, int radio_idx)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct ieee80211_chanctx_conf *conf;
+	struct ieee80211_link_data *link;
+
+	if (radio_idx < 0)
+		return true;
+
+	for_each_sdata_link(local, link) {
+		conf = rcu_dereference(link->conf->chanctx_conf);
+		if (!conf)
+			continue;
+
+		if (conf->radio_idx == radio_idx)
+			return true;
+	}
+
+	return false;
+}
+
+
+static void
+ieee80211_fill_ifcomb_params(struct ieee80211_local *local,
+			     struct iface_combination_params *params,
+			     const struct cfg80211_chan_def *chandef,
+			     struct ieee80211_sub_if_data *sdata,
+			     int radio_idx)
+{
+	struct ieee80211_sub_if_data *sdata_iter;
+	struct ieee80211_chanctx *ctx;
+
+	list_for_each_entry(ctx, &local->chanctx_list, list) {
+		if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
+			continue;
+
+		if (radio_idx >= 0 && ctx->conf.radio_idx != radio_idx)
+			continue;
+
+		if (chandef &&
+		    cfg80211_chandef_compatible(chandef, &ctx->conf.def))
+			continue;
+
+		params->num_different_channels++;
+
+		params->radar_detect |=
+			ieee80211_chanctx_radar_detect(local, ctx);
+	}
+
+	list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) {
+		struct wireless_dev *wdev_iter;
+
+		wdev_iter = &sdata_iter->wdev;
+
+		if (sdata_iter == sdata ||
+		    !ieee80211_sdata_running(sdata_iter) ||
+		    cfg80211_iftype_allowed(local->hw.wiphy,
+					    wdev_iter->iftype, 0, 1))
+			continue;
+
+		if (!ieee80211_sdata_uses_radio(sdata_iter, radio_idx))
+			continue;
+
+		params->iftype_num[wdev_iter->iftype]++;
+	}
+}
+
 int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
 				 const struct cfg80211_chan_def *chandef,
 				 enum ieee80211_chanctx_mode chanmode,
-				 u8 radar_detect)
+				 u8 radar_detect, int radio_idx)
 {
+	bool shared = chanmode == IEEE80211_CHANCTX_SHARED;
 	struct ieee80211_local *local = sdata->local;
-	struct ieee80211_sub_if_data *sdata_iter;
 	enum nl80211_iftype iftype = sdata->wdev.iftype;
 	struct ieee80211_chanctx *ctx;
 	int total = 1;
@@ -3977,6 +4045,8 @@ int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
 	if (iftype != NL80211_IFTYPE_UNSPECIFIED)
 		params.iftype_num[iftype] = 1;
 
+	ieee80211_fill_ifcomb_params(local, &params, shared ? chandef : NULL,
+				     sdata, radio_idx);
 	list_for_each_entry(ctx, &local->chanctx_list, list) {
 		if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
 			continue;
@@ -3986,28 +4056,9 @@ int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
 			params.num_different_channels++;
 			continue;
 		}
-		if (chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
-		    cfg80211_chandef_compatible(chandef,
-						&ctx->conf.def))
-			continue;
 		params.num_different_channels++;
 	}
 
-	list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) {
-		struct wireless_dev *wdev_iter;
-
-		wdev_iter = &sdata_iter->wdev;
-
-		if (sdata_iter == sdata ||
-		    !ieee80211_sdata_running(sdata_iter) ||
-		    cfg80211_iftype_allowed(local->hw.wiphy,
-					    wdev_iter->iftype, 0, 1))
-			continue;
-
-		params.iftype_num[wdev_iter->iftype]++;
-		total++;
-	}
-
 	if (total == 1 && !params.radar_detect)
 		return 0;
 
@@ -4024,28 +4075,23 @@ ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,
 					  c->num_different_channels);
 }
 
-int ieee80211_max_num_channels(struct ieee80211_local *local)
+int ieee80211_max_num_channels(struct ieee80211_local *local, int radio_idx)
 {
+	struct wiphy *wiphy = local->hw.wiphy;
 	struct ieee80211_sub_if_data *sdata;
 	struct ieee80211_chanctx *ctx;
 	u32 max_num_different_channels = 1;
 	int err;
 	struct iface_combination_params params = {0};
 
-	lockdep_assert_wiphy(local->hw.wiphy);
-
-	list_for_each_entry(ctx, &local->chanctx_list, list) {
-		if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
-			continue;
-
-		params.num_different_channels++;
+	if (radio_idx >= wiphy->n_radio)
+		return -EINVAL;
+	else if (radio_idx >= 0)
+		params.radio = &wiphy->radio[radio_idx];
 
-		params.radar_detect |=
-			ieee80211_chanctx_radar_detect(local, ctx);
-	}
+	lockdep_assert_wiphy(local->hw.wiphy);
 
-	list_for_each_entry_rcu(sdata, &local->interfaces, list)
-		params.iftype_num[sdata->wdev.iftype]++;
+	ieee80211_fill_ifcomb_params(local, &params, NULL, NULL, radio_idx);
 
 	err = cfg80211_iter_combinations(local->hw.wiphy, &params,
 					 ieee80211_iter_max_chans,
-- 
git-series 0.9.1

[RFC v2 6/7] wifi: mac80211: move code in ieee80211_link_reserve_chanctx to a helper

[Felix Fietkau]

Reduces indentation in preparation for further changes

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 net/mac80211/chan.c | 141 ++++++++++++++++++++++-----------------------
 1 file changed, 72 insertions(+), 69 deletions(-)

diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index 0e899c07bc2b..ac49c2c71d2b 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -1060,6 +1060,71 @@ int ieee80211_link_unreserve_chanctx(struct ieee80211_link_data *link)
 	return 0;
 }
 
+static struct ieee80211_chanctx *
+ieee80211_replace_chanctx(struct ieee80211_local *local,
+			  const struct ieee80211_chan_req *chanreq,
+			  enum ieee80211_chanctx_mode mode,
+			  struct ieee80211_chanctx *curr_ctx)
+{
+	struct ieee80211_chanctx *new_ctx, *ctx;
+
+	if (!curr_ctx || (curr_ctx->replace_state ==
+			  IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
+	    !list_empty(&curr_ctx->reserved_links)) {
+		/*
+		 * Another link already requested this context for a
+		 * reservation. Find another one hoping all links assigned
+		 * to it will also switch soon enough.
+		 *
+		 * TODO: This needs a little more work as some cases
+		 * (more than 2 chanctx capable devices) may fail which could
+		 * otherwise succeed provided some channel context juggling was
+		 * performed.
+		 *
+		 * Consider ctx1..3, link1..6, each ctx has 2 links. link1 and
+		 * link2 from ctx1 request new different chandefs starting 2
+		 * in-place reserations with ctx4 and ctx5 replacing ctx1 and
+		 * ctx2 respectively. Next link5 and link6 from ctx3 reserve
+		 * ctx4. If link3 and link4 remain on ctx2 as they are then this
+		 * fails unless `replace_ctx` from ctx5 is replaced with ctx3.
+		 */
+		list_for_each_entry(ctx, &local->chanctx_list, list) {
+			if (ctx->replace_state !=
+			    IEEE80211_CHANCTX_REPLACE_NONE)
+				continue;
+
+			if (!list_empty(&ctx->reserved_links))
+				continue;
+
+			curr_ctx = ctx;
+			break;
+		}
+	}
+
+	/*
+	 * If that's true then all available contexts already have reservations
+	 * and cannot be used.
+	 */
+	if (!curr_ctx || (curr_ctx->replace_state ==
+			  IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
+	    !list_empty(&curr_ctx->reserved_links))
+		return ERR_PTR(-EBUSY);
+
+	new_ctx = ieee80211_alloc_chanctx(local, chanreq, mode, -1);
+	if (!new_ctx)
+		return ERR_PTR(-ENOMEM);
+
+	new_ctx->replace_ctx = curr_ctx;
+	new_ctx->replace_state = IEEE80211_CHANCTX_REPLACES_OTHER;
+
+	curr_ctx->replace_ctx = new_ctx;
+	curr_ctx->replace_state = IEEE80211_CHANCTX_WILL_BE_REPLACED;
+
+	list_add_rcu(&new_ctx->list, &local->chanctx_list);
+
+	return new_ctx;
+}
+
 int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link,
 				   const struct ieee80211_chan_req *chanreq,
 				   enum ieee80211_chanctx_mode mode,
@@ -1067,7 +1132,7 @@ int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link,
 {
 	struct ieee80211_sub_if_data *sdata = link->sdata;
 	struct ieee80211_local *local = sdata->local;
-	struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
+	struct ieee80211_chanctx *new_ctx, *curr_ctx;
 
 	lockdep_assert_wiphy(local->hw.wiphy);
 
@@ -1077,76 +1142,14 @@ int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link,
 
 	new_ctx = ieee80211_find_reservation_chanctx(local, chanreq, mode);
 	if (!new_ctx) {
-		if (ieee80211_can_create_new_chanctx(local, -1)) {
+		if (ieee80211_can_create_new_chanctx(local, -1))
 			new_ctx = ieee80211_new_chanctx(local, chanreq, mode,
 							false);
-			if (IS_ERR(new_ctx))
-				return PTR_ERR(new_ctx);
-		} else {
-			if (!curr_ctx ||
-			    (curr_ctx->replace_state ==
-			     IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
-			    !list_empty(&curr_ctx->reserved_links)) {
-				/*
-				 * Another link already requested this context
-				 * for a reservation. Find another one hoping
-				 * all links assigned to it will also switch
-				 * soon enough.
-				 *
-				 * TODO: This needs a little more work as some
-				 * cases (more than 2 chanctx capable devices)
-				 * may fail which could otherwise succeed
-				 * provided some channel context juggling was
-				 * performed.
-				 *
-				 * Consider ctx1..3, link1..6, each ctx has 2
-				 * links. link1 and link2 from ctx1 request new
-				 * different chandefs starting 2 in-place
-				 * reserations with ctx4 and ctx5 replacing
-				 * ctx1 and ctx2 respectively. Next link5 and
-				 * link6 from ctx3 reserve ctx4. If link3 and
-				 * link4 remain on ctx2 as they are then this
-				 * fails unless `replace_ctx` from ctx5 is
-				 * replaced with ctx3.
-				 */
-				list_for_each_entry(ctx, &local->chanctx_list,
-						    list) {
-					if (ctx->replace_state !=
-					    IEEE80211_CHANCTX_REPLACE_NONE)
-						continue;
-
-					if (!list_empty(&ctx->reserved_links))
-						continue;
-
-					curr_ctx = ctx;
-					break;
-				}
-			}
-
-			/*
-			 * If that's true then all available contexts already
-			 * have reservations and cannot be used.
-			 */
-			if (!curr_ctx ||
-			    (curr_ctx->replace_state ==
-			     IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
-			    !list_empty(&curr_ctx->reserved_links))
-				return -EBUSY;
-
-			new_ctx = ieee80211_alloc_chanctx(local, chanreq, mode, -1);
-			if (!new_ctx)
-				return -ENOMEM;
-
-			new_ctx->replace_ctx = curr_ctx;
-			new_ctx->replace_state =
-					IEEE80211_CHANCTX_REPLACES_OTHER;
-
-			curr_ctx->replace_ctx = new_ctx;
-			curr_ctx->replace_state =
-					IEEE80211_CHANCTX_WILL_BE_REPLACED;
-
-			list_add_rcu(&new_ctx->list, &local->chanctx_list);
-		}
+		else
+			new_ctx = ieee80211_replace_chanctx(local, chanreq,
+							    mode, curr_ctx);
+		if (IS_ERR(new_ctx))
+			return PTR_ERR(new_ctx);
 	}
 
 	list_add(&link->reserved_chanctx_list, &new_ctx->reserved_links);
-- 
git-series 0.9.1

[RFC v2 7/7] wifi: mac80211: add wiphy radio assignment and validation

[Felix Fietkau]

Validate number of channels and interface combinations per radio.
Assign each channel context to a radio.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 net/mac80211/chan.c | 70 ++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 65 insertions(+), 5 deletions(-)

diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index ac49c2c71d2b..257ee3b1100b 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -696,14 +696,15 @@ static struct ieee80211_chanctx *
 ieee80211_new_chanctx(struct ieee80211_local *local,
 		      const struct ieee80211_chan_req *chanreq,
 		      enum ieee80211_chanctx_mode mode,
-		      bool assign_on_failure)
+		      bool assign_on_failure,
+		      int radio_idx)
 {
 	struct ieee80211_chanctx *ctx;
 	int err;
 
 	lockdep_assert_wiphy(local->hw.wiphy);
 
-	ctx = ieee80211_alloc_chanctx(local, chanreq, mode, -1);
+	ctx = ieee80211_alloc_chanctx(local, chanreq, mode, radio_idx);
 	if (!ctx)
 		return ERR_PTR(-ENOMEM);
 
@@ -1060,6 +1061,24 @@ int ieee80211_link_unreserve_chanctx(struct ieee80211_link_data *link)
 	return 0;
 }
 
+static bool
+ieee80211_radio_freq_match(const struct wiphy_radio *radio,
+			   const struct ieee80211_chan_req *chanreq)
+{
+	const struct wiphy_radio_freq_range *r;
+	u32 freq;
+	int i;
+
+	freq = ieee80211_channel_to_khz(chanreq->oper.chan);
+	for (i = 0; i < radio->n_freq_range; i++) {
+		r = &radio->freq_range[i];
+		if (freq >= r->start_freq && freq <= r->end_freq)
+			return true;
+	}
+
+	return false;
+}
+
 static struct ieee80211_chanctx *
 ieee80211_replace_chanctx(struct ieee80211_local *local,
 			  const struct ieee80211_chan_req *chanreq,
@@ -1067,6 +1086,8 @@ ieee80211_replace_chanctx(struct ieee80211_local *local,
 			  struct ieee80211_chanctx *curr_ctx)
 {
 	struct ieee80211_chanctx *new_ctx, *ctx;
+	struct wiphy *wiphy = local->hw.wiphy;
+	const struct wiphy_radio *radio;
 
 	if (!curr_ctx || (curr_ctx->replace_state ==
 			  IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
@@ -1096,6 +1117,12 @@ ieee80211_replace_chanctx(struct ieee80211_local *local,
 			if (!list_empty(&ctx->reserved_links))
 				continue;
 
+			if (ctx->conf.radio_idx >= 0) {
+					radio = &wiphy->radio[ctx->conf.radio_idx];
+					if (!ieee80211_radio_freq_match(radio, chanreq))
+							continue;
+			}
+
 			curr_ctx = ctx;
 			break;
 		}
@@ -1125,6 +1152,34 @@ ieee80211_replace_chanctx(struct ieee80211_local *local,
 	return new_ctx;
 }
 
+static bool
+ieee80211_find_available_radio(struct ieee80211_local *local,
+			       const struct ieee80211_chan_req *chanreq,
+			       int *radio_idx)
+{
+	struct wiphy *wiphy = local->hw.wiphy;
+	const struct wiphy_radio *radio;
+	int i;
+
+	*radio_idx = -1;
+	if (!wiphy->n_radio)
+		return true;
+
+	for (i = 0; i < wiphy->n_radio; i++) {
+		radio = &wiphy->radio[i];
+		if (!ieee80211_radio_freq_match(radio, chanreq))
+			continue;
+
+		if (!ieee80211_can_create_new_chanctx(local, i))
+			continue;
+
+		*radio_idx = i;
+		return true;
+	}
+
+	return false;
+}
+
 int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link,
 				   const struct ieee80211_chan_req *chanreq,
 				   enum ieee80211_chanctx_mode mode,
@@ -1133,6 +1188,7 @@ int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link,
 	struct ieee80211_sub_if_data *sdata = link->sdata;
 	struct ieee80211_local *local = sdata->local;
 	struct ieee80211_chanctx *new_ctx, *curr_ctx;
+	int radio_idx;
 
 	lockdep_assert_wiphy(local->hw.wiphy);
 
@@ -1142,9 +1198,10 @@ int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link,
 
 	new_ctx = ieee80211_find_reservation_chanctx(local, chanreq, mode);
 	if (!new_ctx) {
-		if (ieee80211_can_create_new_chanctx(local, -1))
+		if (ieee80211_can_create_new_chanctx(local, -1) &&
+		    ieee80211_find_available_radio(local, chanreq, &radio_idx))
 			new_ctx = ieee80211_new_chanctx(local, chanreq, mode,
-							false);
+							false, radio_idx);
 		else
 			new_ctx = ieee80211_replace_chanctx(local, chanreq,
 							    mode, curr_ctx);
@@ -1755,6 +1812,7 @@ int _ieee80211_link_use_channel(struct ieee80211_link_data *link,
 	struct ieee80211_chanctx *ctx;
 	u8 radar_detect_width = 0;
 	bool reserved = false;
+	int radio_idx;
 	int ret;
 
 	lockdep_assert_wiphy(local->hw.wiphy);
@@ -1785,9 +1843,11 @@ int _ieee80211_link_use_channel(struct ieee80211_link_data *link,
 	/* Note: context is now reserved */
 	if (ctx)
 		reserved = true;
+	else if (!ieee80211_find_available_radio(local, chanreq, &radio_idx))
+		ctx = ERR_PTR(-EBUSY);
 	else
 		ctx = ieee80211_new_chanctx(local, chanreq, mode,
-					    assign_on_failure);
+					    assign_on_failure, radio_idx);
 	if (IS_ERR(ctx)) {
 		ret = PTR_ERR(ctx);
 		goto out;
-- 
git-series 0.9.1

Re: [RFC v2 0/7] cfg80211/mac80211: support defining multiple radios per wiphy

[Aditya Kumar Singh]

On 6/6/24 00:01, Felix Fietkau wrote:
> The prerequisite for MLO support in cfg80211/mac80211 is that all the links
> participating in MLO must be from the same wiphy/ieee80211_hw. To meet this
> expectation, some drivers may need to group multiple discrete hardware each
> acting as a link in MLO under single wiphy.
> 
> With this series, the bands and supported frequencies of each individual
> radio are reported to user space. This allows user space to figure out the
> limitations of what combination of channels can be used concurrently.
> 
> Each mac80211 channel context is assigned to a radio based on radio specific
> frequency ranges and interface combinations.
> 
> This is loosely based on Karthikeyan Periyasamy's series
> "[PATCH 00/13] wifi: Add multi physical hardware iface combination support"
> with some differences:
> 
>   - a struct wiphy_radio is defined, which holds the frequency ranges and
>     a full struct ieee80211_iface_combination array
>   - a channel context is explicitly assigned to a radio when created
>   - both global and per-radio interface combination limits are checked
>     and enforced on channel context assignment
> 
> Changes since RFC:
>   - replace static per-radio number of channels limit with full ifcomb
>     checks
>   - remove band bitmask in favor of only using freq ranges

What about handling 2 GHz + 5 GHz issue we discussed in v1 related to 
radar detection width and num chan ctx? Is that taken care?

Re: [RFC v2 0/7] cfg80211/mac80211: support defining multiple radios per wiphy

[Felix Fietkau]

On 06.06.24 12:00, Aditya Kumar Singh wrote:
> On 6/6/24 00:01, Felix Fietkau wrote:
>> The prerequisite for MLO support in cfg80211/mac80211 is that all the links
>> participating in MLO must be from the same wiphy/ieee80211_hw. To meet this
>> expectation, some drivers may need to group multiple discrete hardware each
>> acting as a link in MLO under single wiphy.
>> 
>> With this series, the bands and supported frequencies of each individual
>> radio are reported to user space. This allows user space to figure out the
>> limitations of what combination of channels can be used concurrently.
>> 
>> Each mac80211 channel context is assigned to a radio based on radio specific
>> frequency ranges and interface combinations.
>> 
>> This is loosely based on Karthikeyan Periyasamy's series
>> "[PATCH 00/13] wifi: Add multi physical hardware iface combination support"
>> with some differences:
>> 
>>   - a struct wiphy_radio is defined, which holds the frequency ranges and
>>     a full struct ieee80211_iface_combination array
>>   - a channel context is explicitly assigned to a radio when created
>>   - both global and per-radio interface combination limits are checked
>>     and enforced on channel context assignment
>> 
>> Changes since RFC:
>>   - replace static per-radio number of channels limit with full ifcomb
>>     checks
>>   - remove band bitmask in favor of only using freq ranges
> 
> What about handling 2 GHz + 5 GHz issue we discussed in v1 related to
> radar detection width and num chan ctx? Is that taken care?

Seems that I missed that one. I will take care of it in the next version.

Thanks,

- Felix