iwlagn: implement WoWLAN

Implement WoWLAN support in iwlagn. The device
supports a number of wakeup triggers and can do
GTK rekeying when asleep (if HW crypto is used).
Unfortunately, we need to disconnect from the AP
after resume since we can't yet get all the info
out of the wowlan uCode to stay connected safely.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

drivers/net/wireless/iwlwifi/iwl-agn-lib.c

@@ -400,6 +400,7 @@ void iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
 	struct iwl_tx_queue *txq = &priv->txq[txq_id];
 	struct ieee80211_tx_info *info;
 	struct iwlagn_tx_resp *tx_resp = (void *)&pkt->u.raw[0];
+	struct ieee80211_hdr *hdr;
 	struct iwl_tx_info *txb;
 	u32 status = le16_to_cpu(tx_resp->status.status);
 	int tid;
@@ -426,6 +427,11 @@ void iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
 		IWLAGN_TX_RES_RA_POS;
 
 	spin_lock_irqsave(&priv->sta_lock, flags);
+
+	hdr = (void *)txb->skb->data;
+	if (!ieee80211_is_data_qos(hdr->frame_control))
+		priv->last_seq_ctl = tx_resp->seq_ctl;
+
 	if (txq->sched_retry) {
 		const u32 scd_ssn = iwlagn_get_scd_ssn(tx_resp);
 		struct iwl_ht_agg *agg;

drivers/net/wireless/iwlwifi/iwl-agn-rxon.c

@@ -855,6 +855,9 @@ void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
 				iwl_wake_any_queue(priv, ctx);
 			}
 			ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
+
+			if (ctx->ctxid == IWL_RXON_CTX_BSS)
+				priv->have_rekey_data = false;
 		}
 
 		iwlagn_bt_coex_rssi_monitor(priv);

drivers/net/wireless/iwlwifi/iwl-agn-ucode.c

@@ -513,14 +513,21 @@ int iwlagn_load_ucode_wait_alive(struct iwl_priv *priv,
 		return -EIO;
 	}
 
-	ret = iwl_verify_ucode(priv, image);
-	if (ret) {
-		priv->ucode_type = old_type;
-		return ret;
-	}
+	/*
+	 * This step takes a long time (60-80ms!!) and
+	 * WoWLAN image should be loaded quickly, so
+	 * skip it for WoWLAN.
+	 */
+	if (ucode_type != IWL_UCODE_WOWLAN) {
+		ret = iwl_verify_ucode(priv, image);
+		if (ret) {
+			priv->ucode_type = old_type;
+			return ret;
+		}
 
-	/* delay a bit to give rfkill time to run */
-	msleep(5);
+		/* delay a bit to give rfkill time to run */
+		msleep(5);
+	}
 
 	ret = iwlagn_alive_notify(priv);
 	if (ret) {