iwlwifi: rs: align to new TLC config command API

The new API adds 4 bytes at end of the struct.  We just need to make
sure that we don't break compatibility with old FWs.
Signed-off-by: Mordechay Goodstein <mordechay.goodstein@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/iwlwifi.20201008181047.bb31ce80fc55.I8a272d1da1334b1805761c0731e5d0c76ca2ef29@changeid

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

@@ -193,6 +193,8 @@ enum IWL_TLC_HT_BW_RATES {
  * @sgi_ch_width_supp: bitmap of SGI support per channel width
  *		       use BIT(@enum iwl_tlc_mng_cfg_cw)
  * @reserved2: reserved
+ * @max_tx_op: max TXOP in uSecs for all AC (BK, BE, VO, VI),
+ *	       set zero for no limit.
  */
 struct iwl_tlc_config_cmd {
 	u8 sta_id;
@@ -206,8 +208,9 @@ struct iwl_tlc_config_cmd {
 	__le16 ht_rates[IWL_TLC_NSS_MAX][2];
 	__le16 max_mpdu_len;
 	u8 sgi_ch_width_supp;
-	u8 reserved2[1];
-} __packed; /* TLC_MNG_CONFIG_CMD_API_S_VER_2 */
+	u8 reserved2;
+	__le32 max_tx_op;
+} __packed; /* TLC_MNG_CONFIG_CMD_API_S_VER_3 */
 
 /**
  * enum iwl_tlc_update_flags - updated fields

drivers/net/wireless/intel/iwlwifi/mvm/rs-fw.c

@@ -468,6 +468,12 @@ void rs_fw_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 		.amsdu = iwl_mvm_is_csum_supported(mvm),
 	};
 	int ret;
+	u16 cmd_size = sizeof(cfg_cmd);
+
+	/* In old versions of the API the struct is 4 bytes smaller */
+	if (iwl_fw_lookup_cmd_ver(mvm->fw, DATA_PATH_GROUP,
+				  TLC_MNG_CONFIG_CMD, 0) < 3)
+		cmd_size -= 4;
 
 	memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
 
@@ -482,7 +488,7 @@ void rs_fw_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 	 */
 	sta->max_amsdu_len = max_amsdu_len;
 
-	ret = iwl_mvm_send_cmd_pdu(mvm, cmd_id, CMD_ASYNC, sizeof(cfg_cmd),
+	ret = iwl_mvm_send_cmd_pdu(mvm, cmd_id, CMD_ASYNC, cmd_size,
 				   &cfg_cmd);
 	if (ret)
 		IWL_ERR(mvm, "Failed to send rate scale config (%d)\n", ret);