net/mac80211/tests/chan-mode.c - pub/scm/linux/kernel/git/gregkh/tty - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * KUnit tests for channel mode functions
  *
  * Copyright (C) 2024 Intel Corporation
  */
 #include <net/cfg80211.h>
 #include <kunit/test.h>

 #include "util.h"

 MODULE_IMPORT_NS("EXPORTED_FOR_KUNIT_TESTING");

 static const struct determine_chan_mode_case {
 	const char *desc;
 	u8 extra_supp_rate;
 	enum ieee80211_conn_mode conn_mode;
 	enum ieee80211_conn_mode expected_mode;
 	bool strict;
 	u8 userspace_selector;
 	struct ieee80211_ht_cap ht_capa_mask;
 	struct ieee80211_vht_cap vht_capa;
 	struct ieee80211_vht_cap vht_capa_mask;
 	u8 vht_basic_mcs_1_4_set:1,
 	   vht_basic_mcs_5_8_set:1,
 	   he_basic_mcs_1_4_set:1,
 	   he_basic_mcs_5_8_set:1;
 	u8 vht_basic_mcs_1_4, vht_basic_mcs_5_8;
 	u8 he_basic_mcs_1_4, he_basic_mcs_5_8;
 	u8 eht_mcs7_min_nss;
 	int error;
 } determine_chan_mode_cases[] = {
 	{
 		.desc = "Normal case, EHT is working",
 		.conn_mode = IEEE80211_CONN_MODE_EHT,
 		.expected_mode = IEEE80211_CONN_MODE_EHT,
 	}, {
 		.desc = "Requiring EHT support is fine",
 		.conn_mode = IEEE80211_CONN_MODE_EHT,
 		.expected_mode = IEEE80211_CONN_MODE_EHT,
 		.extra_supp_rate = 0x80 | BSS_MEMBERSHIP_SELECTOR_EHT_PHY,
 	}, {
 		.desc = "Lowering the mode limits us",
 		.conn_mode = IEEE80211_CONN_MODE_VHT,
 		.expected_mode = IEEE80211_CONN_MODE_VHT,
 	}, {
 		.desc = "Requesting a basic rate/selector that we do not support",
 		.conn_mode = IEEE80211_CONN_MODE_EHT,
 		.extra_supp_rate = 0x80 | (BSS_MEMBERSHIP_SELECTOR_MIN - 1),
 		.error = EINVAL,
 	}, {
 		.desc = "As before, but userspace says it is taking care of it",
 		.conn_mode = IEEE80211_CONN_MODE_EHT,
 		.userspace_selector = BSS_MEMBERSHIP_SELECTOR_MIN - 1,
 		.extra_supp_rate = 0x80 | (BSS_MEMBERSHIP_SELECTOR_MIN - 1),
 		.expected_mode = IEEE80211_CONN_MODE_EHT,
 	}, {
 		.desc = "Masking out a supported rate in HT capabilities",
 		.conn_mode = IEEE80211_CONN_MODE_EHT,
 		.expected_mode = IEEE80211_CONN_MODE_LEGACY,
 		.ht_capa_mask = {
 			.mcs.rx_mask[0] = 0xf7,
 		},
 	}, {
 		.desc = "Masking out a RX rate in VHT capabilities",
 		.conn_mode = IEEE80211_CONN_MODE_EHT,
 		.expected_mode = IEEE80211_CONN_MODE_HT,
 		/* Only one RX stream at MCS 0-7 */
 		.vht_capa = {
 			.supp_mcs.rx_mcs_map =
 				cpu_to_le16(IEEE80211_VHT_MCS_SUPPORT_0_7),
 		},
 		.vht_capa_mask = {
 			.supp_mcs.rx_mcs_map = cpu_to_le16(0xffff),
 		},
 		.strict = true,
 	}, {
 		.desc = "Masking out a TX rate in VHT capabilities",
 		.conn_mode = IEEE80211_CONN_MODE_EHT,
 		.expected_mode = IEEE80211_CONN_MODE_HT,
 		/* Only one TX stream at MCS 0-7 */
 		.vht_capa = {
 			.supp_mcs.tx_mcs_map =
 				cpu_to_le16(IEEE80211_VHT_MCS_SUPPORT_0_7),
 		},
 		.vht_capa_mask = {
 			.supp_mcs.tx_mcs_map = cpu_to_le16(0xffff),
 		},
 		.strict = true,
 	}, {
 		.desc = "AP has higher VHT requirement than client",
 		.conn_mode = IEEE80211_CONN_MODE_EHT,
 		.expected_mode = IEEE80211_CONN_MODE_HT,
 		.vht_basic_mcs_5_8_set = 1,
 		.vht_basic_mcs_5_8 = 0xFE, /* require 5th stream */
 		.strict = true,
 	}, {
 		.desc = "all zero VHT basic rates are ignored (many APs broken)",
 		.conn_mode = IEEE80211_CONN_MODE_VHT,
 		.expected_mode = IEEE80211_CONN_MODE_VHT,
 		.vht_basic_mcs_1_4_set = 1,
 		.vht_basic_mcs_5_8_set = 1,
 	}, {
 		.desc = "AP requires 3 HE streams but client only has two",
 		.conn_mode = IEEE80211_CONN_MODE_EHT,
 		.expected_mode = IEEE80211_CONN_MODE_VHT,
 		.he_basic_mcs_1_4 = 0b11001010,
 		.he_basic_mcs_1_4_set = 1,
 	}, {
 		.desc = "all zero HE basic rates are ignored (iPhone workaround)",
 		.conn_mode = IEEE80211_CONN_MODE_HE,
 		.expected_mode = IEEE80211_CONN_MODE_HE,
 		.he_basic_mcs_1_4_set = 1,
 		.he_basic_mcs_5_8_set = 1,
 	}, {
 		.desc = "AP requires too many RX streams with EHT MCS 7",
 		.conn_mode = IEEE80211_CONN_MODE_EHT,
 		.expected_mode = IEEE80211_CONN_MODE_HE,
 		.eht_mcs7_min_nss = 0x15,
 	}, {
 		.desc = "AP requires too many TX streams with EHT MCS 7",
 		.conn_mode = IEEE80211_CONN_MODE_EHT,
 		.expected_mode = IEEE80211_CONN_MODE_HE,
 		.eht_mcs7_min_nss = 0x51,
 	}, {
 		.desc = "AP requires too many RX streams with EHT MCS 7 and EHT is required",
 		.extra_supp_rate = 0x80 | BSS_MEMBERSHIP_SELECTOR_EHT_PHY,
 		.conn_mode = IEEE80211_CONN_MODE_EHT,
 		.eht_mcs7_min_nss = 0x15,
 		.error = EINVAL,
 	}
 };
 KUNIT_ARRAY_PARAM_DESC(determine_chan_mode, determine_chan_mode_cases, desc)

 static void test_determine_chan_mode(struct kunit *test)
 {
 	const struct determine_chan_mode_case *params = test->param_value;
 	struct t_sdata *t_sdata = T_SDATA(test);
 	struct ieee80211_conn_settings conn = {
 		.mode = params->conn_mode,
 		.bw_limit = IEEE80211_CONN_BW_LIMIT_20,
 	};
 	struct cfg80211_bss cbss = {
 		.channel = &t_sdata->band_5ghz.channels[0],
 	};
 	unsigned long userspace_selectors[BITS_TO_LONGS(128)] = {};
 	u8 bss_ies[] = {
 		/* Supported Rates */
 		WLAN_EID_SUPP_RATES, 0x08,
 		0x82, 0x84, 0x8b, 0x96, 0xc, 0x12, 0x18, 0x24,
 		/* Extended Supported Rates */
 		WLAN_EID_EXT_SUPP_RATES, 0x05,
 		0x30, 0x48, 0x60, 0x6c, params->extra_supp_rate,
 		/* HT Capabilities */
 		WLAN_EID_HT_CAPABILITY, 0x1a,
 		0x0c, 0x00, 0x1b, 0xff, 0xff, 0x00, 0x00, 0x00,
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 		0x00, 0x00,
 		/* HT Information (0xff for 1 stream) */
 		WLAN_EID_HT_OPERATION, 0x16,
 		0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 		/* VHT Capabilities */
 		WLAN_EID_VHT_CAPABILITY, 0xc,
 		0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
 		0xff, 0xff, 0x00, 0x00,
 		/* VHT Operation */
 		WLAN_EID_VHT_OPERATION, 0x05,
 		0x00, 0x00, 0x00,
 		params->vht_basic_mcs_1_4_set ?
 			params->vht_basic_mcs_1_4 :
 			le16_get_bits(t_sdata->band_5ghz.vht_cap.vht_mcs.rx_mcs_map, 0xff),
 		params->vht_basic_mcs_5_8_set ?
 			params->vht_basic_mcs_5_8 :
 			le16_get_bits(t_sdata->band_5ghz.vht_cap.vht_mcs.rx_mcs_map, 0xff00),
 		/* HE Capabilities */
 		WLAN_EID_EXTENSION, 0x16, WLAN_EID_EXT_HE_CAPABILITY,
 		0x01, 0x78, 0xc8, 0x1a, 0x40, 0x00, 0x00, 0xbf,
 		0xce, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 		0x00, 0xfa, 0xff, 0xfa, 0xff,
 		/* HE Operation (permit overriding values) */
 		WLAN_EID_EXTENSION, 0x07, WLAN_EID_EXT_HE_OPERATION,
 		0xf0, 0x3f, 0x00, 0xb0,
 		params->he_basic_mcs_1_4_set ? params->he_basic_mcs_1_4 : 0xfc,
 		params->he_basic_mcs_5_8_set ? params->he_basic_mcs_5_8 : 0xff,
 		/* EHT Capabilities */
 		WLAN_EID_EXTENSION, 0x12, WLAN_EID_EXT_EHT_CAPABILITY,
 		0x07, 0x00, 0x1c, 0x00, 0x00, 0xfe, 0xff, 0xff,
 		0x7f, 0x01, 0x00, 0x88, 0x88, 0x88, 0x00, 0x00,
 		0x00,
 		/* EHT Operation */
 		WLAN_EID_EXTENSION, 0x09, WLAN_EID_EXT_EHT_OPERATION,
 		0x01, params->eht_mcs7_min_nss ? params->eht_mcs7_min_nss : 0x11,
 		0x00, 0x00, 0x00, 0x00, 0x24, 0x00,
 	};
 	struct ieee80211_chan_req chanreq = {};
 	struct cfg80211_chan_def ap_chandef = {};
 	struct ieee802_11_elems *elems;

 	if (params->strict)
 		set_bit(IEEE80211_HW_STRICT, t_sdata->local.hw.flags);
 	else
 		clear_bit(IEEE80211_HW_STRICT, t_sdata->local.hw.flags);

 	t_sdata->sdata->u.mgd.ht_capa_mask = params->ht_capa_mask;
 	t_sdata->sdata->u.mgd.vht_capa = params->vht_capa;
 	t_sdata->sdata->u.mgd.vht_capa_mask = params->vht_capa_mask;

 	if (params->userspace_selector)
 		set_bit(params->userspace_selector, userspace_selectors);

 	rcu_assign_pointer(cbss.ies,
 			   kunit_kzalloc(test,
 					 sizeof(cbss) + sizeof(bss_ies),
 					 GFP_KERNEL));
 	KUNIT_ASSERT_NOT_NULL(test, rcu_access_pointer(cbss.ies));
 	((struct cfg80211_bss_ies *)rcu_access_pointer(cbss.ies))->len = sizeof(bss_ies);

 	memcpy((void *)rcu_access_pointer(cbss.ies)->data, bss_ies,
 	       sizeof(bss_ies));

 	rcu_read_lock();
 	elems = ieee80211_determine_chan_mode(t_sdata->sdata, &conn, &cbss,
 					      0, &chanreq, &ap_chandef,
 					      userspace_selectors);
 	rcu_read_unlock();

 	/* We do not need elems, free them if they are valid. */
 	if (!IS_ERR_OR_NULL(elems))
 		kfree(elems);

 	if (params->error) {
 		KUNIT_ASSERT_TRUE(test, IS_ERR(elems));
 		KUNIT_ASSERT_EQ(test, PTR_ERR(elems), -params->error);
 	} else {
 		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, elems);
 		KUNIT_ASSERT_EQ(test, conn.mode, params->expected_mode);
 	}
 }

 static struct kunit_case chan_mode_cases[] = {
 	KUNIT_CASE_PARAM(test_determine_chan_mode,
 			 determine_chan_mode_gen_params),
 	{}
 };

 static struct kunit_suite chan_mode = {
 	.name = "mac80211-mlme-chan-mode",
 	.test_cases = chan_mode_cases,
 };

 kunit_test_suite(chan_mode);
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* KUnit tests for channel mode functions
	*
	* Copyright (C) 2024 Intel Corporation
	*/
	#include <net/cfg80211.h>
	#include <kunit/test.h>

	#include "util.h"

	MODULE_IMPORT_NS("EXPORTED_FOR_KUNIT_TESTING");

	static const struct determine_chan_mode_case {
	const char *desc;
	u8 extra_supp_rate;
	enum ieee80211_conn_mode conn_mode;
	enum ieee80211_conn_mode expected_mode;
	bool strict;
	u8 userspace_selector;
	struct ieee80211_ht_cap ht_capa_mask;
	struct ieee80211_vht_cap vht_capa;
	struct ieee80211_vht_cap vht_capa_mask;
	u8 vht_basic_mcs_1_4_set:1,
	vht_basic_mcs_5_8_set:1,
	he_basic_mcs_1_4_set:1,
	he_basic_mcs_5_8_set:1;
	u8 vht_basic_mcs_1_4, vht_basic_mcs_5_8;
	u8 he_basic_mcs_1_4, he_basic_mcs_5_8;
	u8 eht_mcs7_min_nss;
	int error;
	} determine_chan_mode_cases[] = {
	{
	.desc = "Normal case, EHT is working",
	.conn_mode = IEEE80211_CONN_MODE_EHT,
	.expected_mode = IEEE80211_CONN_MODE_EHT,
	}, {
	.desc = "Requiring EHT support is fine",
	.conn_mode = IEEE80211_CONN_MODE_EHT,
	.expected_mode = IEEE80211_CONN_MODE_EHT,
	.extra_supp_rate = 0x80 \| BSS_MEMBERSHIP_SELECTOR_EHT_PHY,
	}, {
	.desc = "Lowering the mode limits us",
	.conn_mode = IEEE80211_CONN_MODE_VHT,
	.expected_mode = IEEE80211_CONN_MODE_VHT,
	}, {
	.desc = "Requesting a basic rate/selector that we do not support",
	.conn_mode = IEEE80211_CONN_MODE_EHT,
	.extra_supp_rate = 0x80 \| (BSS_MEMBERSHIP_SELECTOR_MIN - 1),
	.error = EINVAL,
	}, {
	.desc = "As before, but userspace says it is taking care of it",
	.conn_mode = IEEE80211_CONN_MODE_EHT,
	.userspace_selector = BSS_MEMBERSHIP_SELECTOR_MIN - 1,
	.extra_supp_rate = 0x80 \| (BSS_MEMBERSHIP_SELECTOR_MIN - 1),
	.expected_mode = IEEE80211_CONN_MODE_EHT,
	}, {
	.desc = "Masking out a supported rate in HT capabilities",
	.conn_mode = IEEE80211_CONN_MODE_EHT,
	.expected_mode = IEEE80211_CONN_MODE_LEGACY,
	.ht_capa_mask = {
	.mcs.rx_mask[0] = 0xf7,
	},
	}, {
	.desc = "Masking out a RX rate in VHT capabilities",
	.conn_mode = IEEE80211_CONN_MODE_EHT,
	.expected_mode = IEEE80211_CONN_MODE_HT,
	/* Only one RX stream at MCS 0-7 */
	.vht_capa = {
	.supp_mcs.rx_mcs_map =
	cpu_to_le16(IEEE80211_VHT_MCS_SUPPORT_0_7),
	},
	.vht_capa_mask = {
	.supp_mcs.rx_mcs_map = cpu_to_le16(0xffff),
	},
	.strict = true,
	}, {
	.desc = "Masking out a TX rate in VHT capabilities",
	.conn_mode = IEEE80211_CONN_MODE_EHT,
	.expected_mode = IEEE80211_CONN_MODE_HT,
	/* Only one TX stream at MCS 0-7 */
	.vht_capa = {
	.supp_mcs.tx_mcs_map =
	cpu_to_le16(IEEE80211_VHT_MCS_SUPPORT_0_7),
	},
	.vht_capa_mask = {
	.supp_mcs.tx_mcs_map = cpu_to_le16(0xffff),
	},
	.strict = true,
	}, {
	.desc = "AP has higher VHT requirement than client",
	.conn_mode = IEEE80211_CONN_MODE_EHT,
	.expected_mode = IEEE80211_CONN_MODE_HT,
	.vht_basic_mcs_5_8_set = 1,
	.vht_basic_mcs_5_8 = 0xFE, /* require 5th stream */
	.strict = true,
	}, {
	.desc = "all zero VHT basic rates are ignored (many APs broken)",
	.conn_mode = IEEE80211_CONN_MODE_VHT,
	.expected_mode = IEEE80211_CONN_MODE_VHT,
	.vht_basic_mcs_1_4_set = 1,
	.vht_basic_mcs_5_8_set = 1,
	}, {
	.desc = "AP requires 3 HE streams but client only has two",
	.conn_mode = IEEE80211_CONN_MODE_EHT,
	.expected_mode = IEEE80211_CONN_MODE_VHT,
	.he_basic_mcs_1_4 = 0b11001010,
	.he_basic_mcs_1_4_set = 1,
	}, {
	.desc = "all zero HE basic rates are ignored (iPhone workaround)",
	.conn_mode = IEEE80211_CONN_MODE_HE,
	.expected_mode = IEEE80211_CONN_MODE_HE,
	.he_basic_mcs_1_4_set = 1,
	.he_basic_mcs_5_8_set = 1,
	}, {
	.desc = "AP requires too many RX streams with EHT MCS 7",
	.conn_mode = IEEE80211_CONN_MODE_EHT,
	.expected_mode = IEEE80211_CONN_MODE_HE,
	.eht_mcs7_min_nss = 0x15,
	}, {
	.desc = "AP requires too many TX streams with EHT MCS 7",
	.conn_mode = IEEE80211_CONN_MODE_EHT,
	.expected_mode = IEEE80211_CONN_MODE_HE,
	.eht_mcs7_min_nss = 0x51,
	}, {
	.desc = "AP requires too many RX streams with EHT MCS 7 and EHT is required",
	.extra_supp_rate = 0x80 \| BSS_MEMBERSHIP_SELECTOR_EHT_PHY,
	.conn_mode = IEEE80211_CONN_MODE_EHT,
	.eht_mcs7_min_nss = 0x15,
	.error = EINVAL,
	}
	};
	KUNIT_ARRAY_PARAM_DESC(determine_chan_mode, determine_chan_mode_cases, desc)

	static void test_determine_chan_mode(struct kunit *test)
	{
	const struct determine_chan_mode_case *params = test->param_value;
	struct t_sdata *t_sdata = T_SDATA(test);
	struct ieee80211_conn_settings conn = {
	.mode = params->conn_mode,
	.bw_limit = IEEE80211_CONN_BW_LIMIT_20,
	};
	struct cfg80211_bss cbss = {
	.channel = &t_sdata->band_5ghz.channels[0],
	};
	unsigned long userspace_selectors[BITS_TO_LONGS(128)] = {};
	u8 bss_ies[] = {
	/* Supported Rates */
	WLAN_EID_SUPP_RATES, 0x08,
	0x82, 0x84, 0x8b, 0x96, 0xc, 0x12, 0x18, 0x24,
	/* Extended Supported Rates */
	WLAN_EID_EXT_SUPP_RATES, 0x05,
	0x30, 0x48, 0x60, 0x6c, params->extra_supp_rate,
	/* HT Capabilities */
	WLAN_EID_HT_CAPABILITY, 0x1a,
	0x0c, 0x00, 0x1b, 0xff, 0xff, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00,
	/* HT Information (0xff for 1 stream) */
	WLAN_EID_HT_OPERATION, 0x16,
	0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	/* VHT Capabilities */
	WLAN_EID_VHT_CAPABILITY, 0xc,
	0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
	0xff, 0xff, 0x00, 0x00,
	/* VHT Operation */
	WLAN_EID_VHT_OPERATION, 0x05,
	0x00, 0x00, 0x00,
	params->vht_basic_mcs_1_4_set ?
	params->vht_basic_mcs_1_4 :
	le16_get_bits(t_sdata->band_5ghz.vht_cap.vht_mcs.rx_mcs_map, 0xff),
	params->vht_basic_mcs_5_8_set ?
	params->vht_basic_mcs_5_8 :
	le16_get_bits(t_sdata->band_5ghz.vht_cap.vht_mcs.rx_mcs_map, 0xff00),
	/* HE Capabilities */
	WLAN_EID_EXTENSION, 0x16, WLAN_EID_EXT_HE_CAPABILITY,
	0x01, 0x78, 0xc8, 0x1a, 0x40, 0x00, 0x00, 0xbf,
	0xce, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0xfa, 0xff, 0xfa, 0xff,
	/* HE Operation (permit overriding values) */
	WLAN_EID_EXTENSION, 0x07, WLAN_EID_EXT_HE_OPERATION,
	0xf0, 0x3f, 0x00, 0xb0,
	params->he_basic_mcs_1_4_set ? params->he_basic_mcs_1_4 : 0xfc,
	params->he_basic_mcs_5_8_set ? params->he_basic_mcs_5_8 : 0xff,
	/* EHT Capabilities */
	WLAN_EID_EXTENSION, 0x12, WLAN_EID_EXT_EHT_CAPABILITY,
	0x07, 0x00, 0x1c, 0x00, 0x00, 0xfe, 0xff, 0xff,
	0x7f, 0x01, 0x00, 0x88, 0x88, 0x88, 0x00, 0x00,
	0x00,
	/* EHT Operation */
	WLAN_EID_EXTENSION, 0x09, WLAN_EID_EXT_EHT_OPERATION,
	0x01, params->eht_mcs7_min_nss ? params->eht_mcs7_min_nss : 0x11,
	0x00, 0x00, 0x00, 0x00, 0x24, 0x00,
	};
	struct ieee80211_chan_req chanreq = {};
	struct cfg80211_chan_def ap_chandef = {};
	struct ieee802_11_elems *elems;

	if (params->strict)
	set_bit(IEEE80211_HW_STRICT, t_sdata->local.hw.flags);
	else
	clear_bit(IEEE80211_HW_STRICT, t_sdata->local.hw.flags);

	t_sdata->sdata->u.mgd.ht_capa_mask = params->ht_capa_mask;
	t_sdata->sdata->u.mgd.vht_capa = params->vht_capa;
	t_sdata->sdata->u.mgd.vht_capa_mask = params->vht_capa_mask;

	if (params->userspace_selector)
	set_bit(params->userspace_selector, userspace_selectors);

	rcu_assign_pointer(cbss.ies,
	kunit_kzalloc(test,
	sizeof(cbss) + sizeof(bss_ies),
	GFP_KERNEL));
	KUNIT_ASSERT_NOT_NULL(test, rcu_access_pointer(cbss.ies));
	((struct cfg80211_bss_ies *)rcu_access_pointer(cbss.ies))->len = sizeof(bss_ies);

	memcpy((void *)rcu_access_pointer(cbss.ies)->data, bss_ies,
	sizeof(bss_ies));

	rcu_read_lock();
	elems = ieee80211_determine_chan_mode(t_sdata->sdata, &conn, &cbss,
	0, &chanreq, &ap_chandef,
	userspace_selectors);
	rcu_read_unlock();

	/* We do not need elems, free them if they are valid. */
	if (!IS_ERR_OR_NULL(elems))
	kfree(elems);

	if (params->error) {
	KUNIT_ASSERT_TRUE(test, IS_ERR(elems));
	KUNIT_ASSERT_EQ(test, PTR_ERR(elems), -params->error);
	} else {
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, elems);
	KUNIT_ASSERT_EQ(test, conn.mode, params->expected_mode);
	}
	}

	static struct kunit_case chan_mode_cases[] = {
	KUNIT_CASE_PARAM(test_determine_chan_mode,
	determine_chan_mode_gen_params),
	{}
	};

	static struct kunit_suite chan_mode = {
	.name = "mac80211-mlme-chan-mode",
	.test_cases = chan_mode_cases,
	};

	kunit_test_suite(chan_mode);