wifi: iwlwifi: add iwlmld sub-driver

iwlwifi is the driver of all Intel wifi devices since 2008.
Since then, the hardware has changed a lot, but the firmware
API has changed even more. The need to keep one driver that
supports all those different APIs led us to introduce a new
architecture circa 2012 which allowed us to keep the same
interface to the hardware (DMAs, Tx queues, etc...) with a
new layer to implement the mid-layer between mac80211 and
the firmware. The first component is called the 'transport'
and the latter is called 'operation_mode' a.k.a  op_mode.

In 2013 we took advantage of the new architecture to
introduce iwlmvm which allowed us to implement the, then,
new firmware API. This op_mode supports 7260 and up, those
devices supports support at least VHT.

Since then, wifi evolved and so did the firmware. It became
much bigger and took a lot of functionality from the driver.
It became increasingly hard to keep the same op_mode for the
newest devices and we experienced frequent regressions on
older devices. In order to avoid those regressions and keep
the code maintainable, we decided it was about time to start
a new op_mode.

iwlmld is a new op_mode that supports BE200 or newer if the
firmware being used is 97.ucode or newer. If the user has
an older devices or BE200 with .96.ucode, iwlmvm will be
loaded. Of course, this op_mode selection is seamless.

All the features supported in iwlmvm are supported in
iwlmld besides a few seldom used use cases: injection and
Hotspot 2.0. Those are under work.

A few points about the implementation:
 * iwlmld doesn't have any mutexes, it relies on the
   wiphy_lock
 * iwlmld is more "resource oriented": stations, links and
   interfaces are allocated and freed only after all the
   relevant flows are completed.
 * Firmware notifications' sizes are validated in a more
   structured way.

We would love to see this new op_mode merged in 6.15. The
firmware for this new driver (.97.ucode) is not yet publicly
available but it'll be sent very soon.
People eager to get an early version of this firmware can
contact Emmanuel at:
emmanuel.grumbach@intel.com

I've listed the people who directly contributed
code, but many others from various teams have
contributed in other ways.

Co-developed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Co-developed-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Co-developed-by: Daniel Gabay <daniel.gabay@intel.com>
Signed-off-by: Daniel Gabay <daniel.gabay@intel.com>
Co-developed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Co-developed-by: Anjaneyulu <pagadala.yesu.anjaneyulu@intel.com>
Signed-off-by: Anjaneyulu <pagadala.yesu.anjaneyulu@intel.com>
Co-developed-by: Yedidya Benshimol <yedidya.ben.shimol@intel.com>
Signed-off-by: Yedidya Benshimol <yedidya.ben.shimol@intel.com>
Co-developed-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Co-developed-by: Shaul Triebitz <shaul.triebitz@intel.com>
Signed-off-by: Shaul Triebitz <shaul.triebitz@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://lore.kernel.org/linux-wireless/20250216094321.537988-1-miriam.rachel.korenblit@intel.com/
[fix Kconfig, fix api/phy.h includes, SPDX tag and coding
 style issues, duplicated includes per 0-day robot]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/Kconfig

@@ -81,14 +81,25 @@ config IWLMVM
 	  of the devices that use this firmware is available here:
 	  https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi#firmware
 
+config IWLMLD
+	tristate "Intel Wireless WiFi MLD Firmware support"
+	select WANT_DEV_COREDUMP
+	depends on MAC80211
+	depends on PTP_1588_CLOCK_OPTIONAL
+	help
+	  This is the driver that supports firmwares of MLD capable devices.
+	  The list of the devices that use this firmware is available here:
+	  https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi#firmware
+
 # don't call it _MODULE -- will confuse Kconfig/fixdep/...
 config IWLWIFI_OPMODE_MODULAR
 	bool
 	default y if IWLDVM=m
 	default y if IWLMVM=m
+	default y if IWLMLD=m
 
-comment "WARNING: iwlwifi is useless without IWLDVM or IWLMVM"
-	depends on IWLDVM=n && IWLMVM=n
+comment "WARNING: iwlwifi is useless without IWLDVM or IWLMVM or IWLMLD"
+	depends on IWLDVM=n && IWLMVM=n && IWLMLD=n
 
 menu "Debugging Options"
 

drivers/net/wireless/intel/iwlwifi/Makefile

@@ -12,14 +12,16 @@ iwlwifi-objs		+= pcie/ctxt-info.o pcie/ctxt-info-gen3.o
 iwlwifi-objs		+= pcie/trans-gen2.o pcie/tx-gen2.o
 iwlwifi-$(CONFIG_IWLDVM) += cfg/1000.o cfg/2000.o cfg/5000.o cfg/6000.o
 iwlwifi-$(CONFIG_IWLMVM) += cfg/7000.o cfg/8000.o cfg/9000.o cfg/22000.o
-iwlwifi-$(CONFIG_IWLMVM) += cfg/ax210.o cfg/bz.o cfg/sc.o cfg/dr.o
+iwlwifi-$(CONFIG_IWLMVM) += cfg/ax210.o
+iwlwifi-$(CONFIG_IWLMLD) += cfg/bz.o cfg/sc.o cfg/dr.o
 iwlwifi-objs		+= iwl-dbg-tlv.o
 iwlwifi-objs		+= iwl-trans.o
 
 iwlwifi-objs		+= fw/img.o fw/notif-wait.o fw/rs.o
 iwlwifi-objs		+= fw/dbg.o fw/pnvm.o fw/dump.o
 iwlwifi-objs		+= fw/regulatory.o
 iwlwifi-$(CONFIG_IWLMVM) += fw/paging.o fw/smem.o fw/init.o
+iwlwifi-$(CONFIG_IWLMLD) += fw/smem.o fw/init.o
 iwlwifi-$(CONFIG_ACPI) += fw/acpi.o
 iwlwifi-$(CONFIG_EFI)	+= fw/uefi.o
 iwlwifi-$(CONFIG_IWLWIFI_DEBUGFS) += fw/debugfs.o
@@ -33,6 +35,7 @@ ccflags-y += -I$(src)
 obj-$(CONFIG_IWLDVM)	+= dvm/
 obj-$(CONFIG_IWLMVM)	+= mvm/
 obj-$(CONFIG_IWLMEI)	+= mei/
+obj-$(CONFIG_IWLMLD)	+= mld/
 
 obj-$(CONFIG_IWLWIFI_KUNIT_TESTS) += tests/
 

drivers/net/wireless/intel/iwlwifi/cfg/bz.c

@@ -38,6 +38,11 @@
 #define IWL_BZ_A_HR_B_MODULE_FIRMWARE(api) \
 	IWL_BZ_A_HR_B_FW_PRE "-" __stringify(api) ".ucode"
 
+#if !IS_ENABLED(CONFIG_IWLMVM)
+const char iwl_ax211_name[] = "Intel(R) Wi-Fi 6E AX211 160MHz";
+const char iwl_ax201_name[] = "Intel(R) Wi-Fi 6 AX201 160MHz";
+#endif
+
 static const struct iwl_base_params iwl_bz_base_params = {
 	.eeprom_size = OTP_LOW_IMAGE_SIZE_32K,
 	.num_of_queues = 512,

drivers/net/wireless/intel/iwlwifi/fw/api/phy.h

@@ -1,11 +1,13 @@
 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
 /*
- * Copyright (C) 2012-2014, 2019-2022, 2024 Intel Corporation
+ * Copyright (C) 2012-2014, 2019-2022, 2024-2025 Intel Corporation
  * Copyright (C) 2013-2015 Intel Mobile Communications GmbH
  * Copyright (C) 2016-2017 Intel Deutschland GmbH
  */
 #ifndef __iwl_fw_api_phy_h__
 #define __iwl_fw_api_phy_h__
+#include <linux/types.h>
+#include <linux/bits.h>
 
 /**
  * enum iwl_phy_ops_subcmd_ids - PHY group commands

drivers/net/wireless/intel/iwlwifi/iwl-config.h

@@ -653,6 +653,10 @@ extern const struct iwl_cfg iwl_cfg_ma;
 
 extern const struct iwl_cfg iwl_cfg_so_a0_hr_a0;
 extern const struct iwl_cfg iwl_cfg_quz_a0_hr_b0;
+#endif /* CONFIG_IWLMVM */
+
+#if IS_ENABLED(CONFIG_IWLMLD)
+extern const struct iwl_ht_params iwl_bz_ht_params;
 
 extern const struct iwl_ht_params iwl_bz_ht_params;
 
@@ -664,6 +668,6 @@ extern const struct iwl_cfg iwl_cfg_sc2;
 extern const struct iwl_cfg iwl_cfg_sc2f;
 extern const struct iwl_cfg iwl_cfg_dr;
 extern const struct iwl_cfg iwl_cfg_br;
-#endif /* CONFIG_IWLMVM */
+#endif /* CONFIG_IWLMLD */
 
 #endif /* __IWL_CONFIG_H__ */

drivers/net/wireless/intel/iwlwifi/iwl-drv.c

@@ -75,6 +75,9 @@ struct iwl_drv {
 enum {
 	DVM_OP_MODE,
 	MVM_OP_MODE,
+#if IS_ENABLED(CONFIG_IWLMLD)
+	MLD_OP_MODE,
+#endif
 };
 
 /* Protects the table contents, i.e. the ops pointer & drv list */
@@ -86,6 +89,9 @@ static struct iwlwifi_opmode_table {
 } iwlwifi_opmode_table[] = {		/* ops set when driver is initialized */
 	[DVM_OP_MODE] = { .name = "iwldvm", .ops = NULL },
 	[MVM_OP_MODE] = { .name = "iwlmvm", .ops = NULL },
+#if IS_ENABLED(CONFIG_IWLMLD)
+	[MLD_OP_MODE] = { .name = "iwlmld", .ops = NULL },
+#endif
 };
 
 #define IWL_DEFAULT_SCAN_CHANNELS 40
@@ -316,6 +322,7 @@ struct iwl_firmware_pieces {
 	size_t dbg_trigger_tlv_len[FW_DBG_TRIGGER_MAX];
 	struct iwl_fw_dbg_mem_seg_tlv *dbg_mem_tlv;
 	size_t n_mem_tlv;
+	u32 major;
 };
 
 static void alloc_sec_data(struct iwl_firmware_pieces *pieces,
@@ -957,19 +964,19 @@ static int iwl_parse_tlv_firmware(struct iwl_drv *drv,
 			break;
 		case IWL_UCODE_TLV_FW_VERSION: {
 			const __le32 *ptr = (const void *)tlv_data;
-			u32 major, minor;
+			u32 minor;
 			u8 local_comp;
 
 			if (tlv_len != sizeof(u32) * 3)
 				goto invalid_tlv_len;
 
-			major = le32_to_cpup(ptr++);
+			pieces->major = le32_to_cpup(ptr++);
 			minor = le32_to_cpup(ptr++);
 			local_comp = le32_to_cpup(ptr);
 
 			snprintf(drv->fw.fw_version,
 				 sizeof(drv->fw.fw_version),
-				 "%u.%08x.%u %s", major, minor,
+				 "%u.%08x.%u %s", pieces->major, minor,
 				 local_comp, iwl_reduced_fw_name(drv));
 			break;
 			}
@@ -1468,6 +1475,8 @@ static void _iwl_op_mode_stop(struct iwl_drv *drv)
 	}
 }
 
+#define IWL_MLD_SUPPORTED_FW_VERSION 97
+
 /*
  * iwl_req_fw_callback - callback when firmware was loaded
  *
@@ -1720,6 +1729,19 @@ static void iwl_req_fw_callback(const struct firmware *ucode_raw, void *context)
 		break;
 	}
 
+#if IS_ENABLED(CONFIG_IWLMLD)
+	if (pieces->major >= IWL_MLD_SUPPORTED_FW_VERSION)
+		op = &iwlwifi_opmode_table[MLD_OP_MODE];
+	else
+#else
+	if (pieces->major >= IWL_MLD_SUPPORTED_FW_VERSION) {
+		IWL_ERR(drv,
+			"IWLMLD needs to be compiled to support this firmware\n");
+		mutex_unlock(&iwlwifi_opmode_table_mtx);
+		goto out_unbind;
+	}
+#endif
+
 	IWL_INFO(drv, "loaded firmware version %s op_mode %s\n",
 		 drv->fw.fw_version, op->name);
 

drivers/net/wireless/intel/iwlwifi/mld/Makefile

@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+obj-$(CONFIG_IWLMLD)   += iwlmld.o
+obj-$(CONFIG_IWLWIFI_KUNIT_TESTS) += tests/
+
+iwlmld-y += mld.o notif.o mac80211.o fw.o power.o iface.o link.o rx.o mcc.o session-protect.o phy.o
+iwlmld-y += scan.o sta.o tx.o coex.o tlc.o agg.o key.o regulatory.o ap.o thermal.o roc.o stats.o
+iwlmld-y += low_latency.o mlo.o ptp.o time_sync.o ftm-initiator.o
+iwlmld-$(CONFIG_IWLWIFI_DEBUGFS) += debugfs.o
+iwlmld-$(CONFIG_IWLWIFI_LEDS) += led.o
+iwlmld-$(CONFIG_PM_SLEEP) += d3.o
+
+# non-upstream things
+iwlmld-$(CONFIG_IWL_VENDOR_CMDS) += vendor-cmd.o
+iwlmld-$(CONFIG_IWLMVM_AX_SOFTAP_TESTMODE) += ax-softap-testmode.o
+
+subdir-ccflags-y += -I$(src)/../