drivers/net/wireless/intel/iwlwifi/mvm/tests/links.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * KUnit tests for channel helper functions
 *
 * Copyright (C) 2024 Intel Corporation
 */
#include <net/mac80211.h>
#include "../mvm.h"
#include <kunit/test.h>

MODULE_IMPORT_NS("EXPORTED_FOR_KUNIT_TESTING");

static struct wiphy wiphy = {
	.mtx = __MUTEX_INITIALIZER(wiphy.mtx),
};

static struct ieee80211_hw hw = {
	.wiphy = &wiphy,
};

static struct ieee80211_channel chan_5ghz = {
	.band = NL80211_BAND_5GHZ,
};

static struct ieee80211_channel chan_6ghz = {
	.band = NL80211_BAND_6GHZ,
};

static struct ieee80211_channel chan_2ghz = {
	.band = NL80211_BAND_2GHZ,
};

static struct cfg80211_chan_def chandef_a = {};

static struct cfg80211_chan_def chandef_b = {};

static struct iwl_mvm_phy_ctxt ctx = {};

static struct iwl_mvm_vif_link_info mvm_link = {
	.phy_ctxt = &ctx,
	.active = true
};

static struct cfg80211_bss bss = {};

static struct ieee80211_bss_conf link_conf = {.bss = &bss};

static const struct iwl_fw_cmd_version entry = {
	.group = LEGACY_GROUP,
	.cmd = BT_PROFILE_NOTIFICATION,
	.notif_ver = 4
};

static struct iwl_fw fw = {
	.ucode_capa = {
		.n_cmd_versions = 1,
		.cmd_versions = &entry,
	},
};

static struct iwl_mvm mvm = {
	.hw = &hw,
	.fw = &fw,
};

static const struct link_grading_case {
	const char *desc;
	const struct cfg80211_chan_def chandef;
	s32 signal;
	s16 channel_util;
	int chan_load_by_us;
	unsigned int grade;
} link_grading_cases[] = {
	{
		.desc = "UHB, RSSI below range, no factors",
		.chandef = {
			.chan = &chan_6ghz,
			.width = NL80211_CHAN_WIDTH_20,
		},
		.signal = -100,
		.grade = 177,
	},
	{
		.desc = "LB, RSSI in range, no factors",
		.chandef = {
			.chan = &chan_2ghz,
			.width = NL80211_CHAN_WIDTH_20,
		},
		.signal = -84,
		.grade = 344,
	},
	{
		.desc = "HB, RSSI above range, no factors",
		.chandef = {
			.chan = &chan_5ghz,
			.width = NL80211_CHAN_WIDTH_20,
		},
		.signal = -50,
		.grade = 3442,
	},
	{
		.desc = "HB, BSS Load IE (20 percent), inactive link, no puncturing factor",
		.chandef = {
			.chan = &chan_5ghz,
			.width = NL80211_CHAN_WIDTH_20,
		},
		.signal = -66,
		.channel_util = 51,
		.grade = 1836,
	},
	{
		.desc = "LB, BSS Load IE (20 percent), active link, chan_load_by_us=10 percent. No puncturing factor",
		.chandef = {
			.chan = &chan_2ghz,
			.width = NL80211_CHAN_WIDTH_20,
		},
		.signal = -61,
		.channel_util = 51,
		.chan_load_by_us = 10,
		.grade = 2061,
	},
	{
		.desc = "UHB, BSS Load IE (40 percent), active link, chan_load_by_us=50 (invalid) percent. No puncturing factor",
		.chandef = {
			.chan = &chan_6ghz,
			.width = NL80211_CHAN_WIDTH_20,
		},
		.signal = -66,
		.channel_util = 102,
		.chan_load_by_us = 50,
		.grade = 1552,
	},
	{	.desc = "HB, 80 MHz, no channel load factor, punctured percentage 0",
		.chandef = {
			.chan = &chan_5ghz,
			.width = NL80211_CHAN_WIDTH_80,
			.punctured = 0x0000
		},
		.signal = -72,
		.grade = 1750,
	},
	{	.desc = "HB, 160 MHz, no channel load factor, punctured percentage 25",
		.chandef = {
			.chan = &chan_5ghz,
			.width = NL80211_CHAN_WIDTH_160,
			.punctured = 0x3
		},
		.signal = -72,
		.grade = 1312,
	},
	{	.desc = "UHB, 320 MHz, no channel load factor, punctured percentage 12.5 (2/16)",
		.chandef = {
			.chan = &chan_6ghz,
			.width = NL80211_CHAN_WIDTH_320,
			.punctured = 0x3
		},
		.signal = -72,
		.grade = 1806,
	},
	{	.desc = "HB, 160 MHz, channel load 20, channel load by us 10, punctured percentage 25",
		.chandef = {
			.chan = &chan_5ghz,
			.width = NL80211_CHAN_WIDTH_160,
			.punctured = 0x3
		},
		.channel_util = 51,
		.chan_load_by_us = 10,
		.signal = -72,
		.grade = 1179,
	},
};

KUNIT_ARRAY_PARAM_DESC(link_grading, link_grading_cases, desc)

static void setup_link_conf(struct kunit *test)
{
	const struct link_grading_case *params = test->param_value;
	size_t vif_size = sizeof(struct ieee80211_vif) +
		sizeof(struct iwl_mvm_vif);
	struct ieee80211_vif *vif = kunit_kzalloc(test, vif_size, GFP_KERNEL);
	struct ieee80211_bss_load_elem *bss_load;
	struct element *element;
	size_t ies_size = sizeof(struct cfg80211_bss_ies) + sizeof(*bss_load) + sizeof(element);
	struct cfg80211_bss_ies *ies;
	struct iwl_mvm_vif *mvmvif;

	KUNIT_ASSERT_NOT_NULL(test, vif);

	mvmvif = iwl_mvm_vif_from_mac80211(vif);
	if (params->chan_load_by_us > 0) {
		ctx.channel_load_by_us = params->chan_load_by_us;
		mvmvif->link[0] = &mvm_link;
	}

	link_conf.vif = vif;
	link_conf.chanreq.oper = params->chandef;
	bss.signal = DBM_TO_MBM(params->signal);

	ies = kunit_kzalloc(test, ies_size, GFP_KERNEL);
	KUNIT_ASSERT_NOT_NULL(test, ies);
	ies->len = sizeof(*bss_load) + sizeof(struct element);

	element = (void *)ies->data;
	element->datalen = sizeof(*bss_load);
	element->id = 11;

	bss_load = (void *)element->data;
	bss_load->channel_util = params->channel_util;

	rcu_assign_pointer(bss.ies, ies);
	rcu_assign_pointer(bss.beacon_ies, ies);
}

static void test_link_grading(struct kunit *test)
{
	const struct link_grading_case *params = test->param_value;
	unsigned int ret;

	setup_link_conf(test);

	rcu_read_lock();
	ret = iwl_mvm_get_link_grade(&link_conf);
	rcu_read_unlock();

	KUNIT_EXPECT_EQ(test, ret, params->grade);

	kunit_kfree(test, link_conf.vif);
	RCU_INIT_POINTER(bss.ies, NULL);
}

static struct kunit_case link_grading_test_cases[] = {
	KUNIT_CASE_PARAM(test_link_grading, link_grading_gen_params),
	{}
};

static struct kunit_suite link_grading = {
	.name = "iwlmvm-link-grading",
	.test_cases = link_grading_test_cases,
};

kunit_test_suite(link_grading);

static const struct valid_link_pair_case {
	const char *desc;
	bool bt;
	struct ieee80211_channel *chan_a;
	struct ieee80211_channel *chan_b;
	enum nl80211_chan_width cw_a;
	enum nl80211_chan_width cw_b;
	s32 sig_a;
	s32 sig_b;
	bool csa_a;
	bool valid;
} valid_link_pair_cases[] = {
	{
		.desc = "HB + UHB, valid.",
		.chan_a = &chan_6ghz,
		.chan_b = &chan_5ghz,
		.valid = true,
	},
	{
		.desc = "LB + HB, no BT.",
		.chan_a = &chan_2ghz,
		.chan_b = &chan_5ghz,
		.valid = true,
	},
	{
		.desc = "LB + HB, with BT.",
		.bt = true,
		.chan_a = &chan_2ghz,
		.chan_b = &chan_5ghz,
		.valid = false,
	},
	{
		.desc = "Same band",
		.chan_a = &chan_2ghz,
		.chan_b = &chan_2ghz,
		.valid = false,
	},
	{
		.desc = "RSSI: LB, 20 MHz, low",
		.chan_a = &chan_2ghz,
		.cw_a = NL80211_CHAN_WIDTH_20,
		.sig_a = -68,
		.chan_b = &chan_5ghz,
		.valid = false,
	},
	{
		.desc = "RSSI: UHB, 20 MHz, high",
		.chan_a = &chan_6ghz,
		.cw_a = NL80211_CHAN_WIDTH_20,
		.sig_a = -66,
		.chan_b = &chan_5ghz,
		.cw_b = NL80211_CHAN_WIDTH_20,
		.valid = true,
	},
	{
		.desc = "RSSI: UHB, 40 MHz, low",
		.chan_a = &chan_6ghz,
		.cw_a = NL80211_CHAN_WIDTH_40,
		.sig_a = -65,
		.chan_b = &chan_5ghz,
		.cw_b = NL80211_CHAN_WIDTH_40,
		.valid = false,
	},
	{
		.desc = "RSSI: UHB, 40 MHz, high",
		.chan_a = &chan_6ghz,
		.cw_a = NL80211_CHAN_WIDTH_40,
		.sig_a = -63,
		.chan_b = &chan_5ghz,
		.cw_b = NL80211_CHAN_WIDTH_40,
		.valid = true,
	},
	{
		.desc = "RSSI: UHB, 80 MHz, low",
		.chan_a = &chan_6ghz,
		.cw_a = NL80211_CHAN_WIDTH_80,
		.sig_a = -62,
		.chan_b = &chan_5ghz,
		.cw_b = NL80211_CHAN_WIDTH_80,
		.valid = false,
	},
	{
		.desc = "RSSI: UHB, 80 MHz, high",
		.chan_a = &chan_6ghz,
		.cw_a = NL80211_CHAN_WIDTH_80,
		.sig_a = -60,
		.chan_b = &chan_5ghz,
		.cw_b = NL80211_CHAN_WIDTH_80,
		.valid = true,
	},
	{
		.desc = "RSSI: UHB, 160 MHz, low",
		.chan_a = &chan_6ghz,
		.cw_a = NL80211_CHAN_WIDTH_160,
		.sig_a = -59,
		.chan_b = &chan_5ghz,
		.cw_b = NL80211_CHAN_WIDTH_160,
		.valid = false,
	},
	{
		.desc = "RSSI: HB, 160 MHz, high",
		.chan_a = &chan_6ghz,
		.cw_a = NL80211_CHAN_WIDTH_160,
		.sig_a = -5,
		.chan_b = &chan_5ghz,
		.cw_b = NL80211_CHAN_WIDTH_160,
		.valid = true,
	},
	{
		.desc = "CSA active",
		.chan_a = &chan_6ghz,
		.cw_a = NL80211_CHAN_WIDTH_160,
		.sig_a = -5,
		.chan_b = &chan_5ghz,
		.cw_b = NL80211_CHAN_WIDTH_160,
		.valid = false,
		/* same as previous entry with valid=true except for CSA */
		.csa_a = true,
	},
};

KUNIT_ARRAY_PARAM_DESC(valid_link_pair, valid_link_pair_cases, desc)

static void test_valid_link_pair(struct kunit *test)
{
	const struct valid_link_pair_case *params = test->param_value;
	size_t vif_size = sizeof(struct ieee80211_vif) +
		sizeof(struct iwl_mvm_vif);
	struct ieee80211_vif *vif = kunit_kzalloc(test, vif_size, GFP_KERNEL);
	struct iwl_trans *trans = kunit_kzalloc(test, sizeof(struct iwl_trans),
						GFP_KERNEL);
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_link_sel_data link_a = {
		.chandef = &chandef_a,
		.link_id = 1,
		.signal = params->sig_a,
	};
	struct iwl_mvm_link_sel_data link_b = {
		.chandef = &chandef_b,
		.link_id = 5,
		.signal = params->sig_b,
	};
	struct ieee80211_bss_conf *conf;
	bool result;

	KUNIT_ASSERT_NOT_NULL(test, vif);
	KUNIT_ASSERT_NOT_NULL(test, trans);

	chandef_a.chan = params->chan_a;
	chandef_b.chan = params->chan_b;

	chandef_a.width = params->cw_a ?: NL80211_CHAN_WIDTH_20;
	chandef_b.width = params->cw_b ?: NL80211_CHAN_WIDTH_20;

	mvm.trans = trans;

	mvm.last_bt_notif.wifi_loss_low_rssi = params->bt;
	mvmvif->mvm = &mvm;

	conf = kunit_kzalloc(test, sizeof(*vif->link_conf[0]), GFP_KERNEL);
	KUNIT_ASSERT_NOT_NULL(test, conf);
	conf->chanreq.oper = chandef_a;
	conf->csa_active = params->csa_a;
	vif->link_conf[link_a.link_id] = (void __rcu *)conf;

	conf = kunit_kzalloc(test, sizeof(*vif->link_conf[0]), GFP_KERNEL);
	KUNIT_ASSERT_NOT_NULL(test, conf);
	conf->chanreq.oper = chandef_b;
	vif->link_conf[link_b.link_id] = (void __rcu *)conf;

	wiphy_lock(&wiphy);
	result = iwl_mvm_mld_valid_link_pair(vif, &link_a, &link_b);
	wiphy_unlock(&wiphy);

	KUNIT_EXPECT_EQ(test, result, params->valid);

	kunit_kfree(test, vif);
	kunit_kfree(test, trans);
}

static struct kunit_case valid_link_pair_test_cases[] = {
	KUNIT_CASE_PARAM(test_valid_link_pair, valid_link_pair_gen_params),
	{},
};

static struct kunit_suite valid_link_pair = {
	.name = "iwlmvm-valid-link-pair",
	.test_cases = valid_link_pair_test_cases,
};

kunit_test_suite(valid_link_pair);