wifi: iwlwifi: get the max number of links from the firmware

The firmware advertises the maximum number of links.
Use it.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20241231135726.5eb29510f2b4.I7f35f61987c2ee905960ee476df6803632b0feb8@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/fw/file.h

@@ -104,6 +104,7 @@ enum iwl_ucode_tlv_type {
 	IWL_UCODE_TLV_CURRENT_PC		= 68,
 
 	IWL_UCODE_TLV_FW_NUM_STATIONS		= IWL_UCODE_TLV_CONST_BASE + 0,
+	IWL_UCODE_TLV_FW_NUM_LINKS		= IWL_UCODE_TLV_CONST_BASE + 1,
 	IWL_UCODE_TLV_FW_NUM_BEACONS		= IWL_UCODE_TLV_CONST_BASE + 2,
 
 	IWL_UCODE_TLV_TYPE_DEBUG_INFO		= IWL_UCODE_TLV_DEBUG_BASE + 0,

drivers/net/wireless/intel/iwlwifi/fw/img.h

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
 /*
- * Copyright (C) 2005-2014, 2018-2023 Intel Corporation
+ * Copyright (C) 2005-2014, 2018-2024 Intel Corporation
  * Copyright (C) 2013-2015 Intel Mobile Communications GmbH
  * Copyright (C) 2016 Intel Deutschland GmbH
  */
@@ -51,6 +51,7 @@ struct iwl_ucode_capabilities {
 	u32 error_log_addr;
 	u32 error_log_size;
 	u32 num_stations;
+	u32 num_links;
 	u32 num_beacons;
 	unsigned long _api[BITS_TO_LONGS(NUM_IWL_UCODE_TLV_API)];
 	unsigned long _capa[BITS_TO_LONGS(NUM_IWL_UCODE_TLV_CAPA)];

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

@@ -22,6 +22,7 @@
 #include "iwl-modparams.h"
 #include "fw/api/alive.h"
 #include "fw/api/mac.h"
+#include "fw/api/mac-cfg.h"
 
 /******************************************************************************
  *
@@ -1197,6 +1198,19 @@ static int iwl_parse_tlv_firmware(struct iwl_drv *drv,
 			capa->num_stations =
 				le32_to_cpup((const __le32 *)tlv_data);
 			break;
+		case IWL_UCODE_TLV_FW_NUM_LINKS:
+			if (tlv_len != sizeof(u32))
+				goto invalid_tlv_len;
+			if (le32_to_cpup((const __le32 *)tlv_data) >
+			    IWL_FW_MAX_LINK_ID + 1) {
+				IWL_ERR(drv,
+					"%d is an invalid number of links\n",
+					le32_to_cpup((const __le32 *)tlv_data));
+				goto tlv_error;
+			}
+			capa->num_links =
+				le32_to_cpup((const __le32 *)tlv_data);
+			break;
 		case IWL_UCODE_TLV_FW_NUM_BEACONS:
 			if (tlv_len != sizeof(u32))
 				goto invalid_tlv_len;