iwl3965: remove useless network and duplicate checking

mac802 can handle duplicate packages on its own, so let it do it.
The patch is based on patch from Johannes Berg for iwl4965.
Signed-off-by: Adel Gadllah <adel.gadllah@gmail.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-3945.c

@@ -514,6 +514,23 @@ static inline void iwl3945_dbg_report_frame(struct iwl3945_priv *priv,
 }
 #endif
 
+/* This is necessary only for a number of statistics, see the caller. */
+static int iwl3945_is_network_packet(struct iwl3945_priv *priv,
+		struct ieee80211_hdr *header)
+{
+	/* Filter incoming packets to determine if they are targeted toward
+	 * this network, discarding packets coming from ourselves */
+	switch (priv->iw_mode) {
+	case IEEE80211_IF_TYPE_IBSS: /* Header: Dest. | Source    | BSSID */
+		/* packets to our IBSS update information */
+		return !compare_ether_addr(header->addr3, priv->bssid);
+	case IEEE80211_IF_TYPE_STA: /* Header: Dest. | AP{BSSID} | Source */
+		/* packets to our IBSS update information */
+		return !compare_ether_addr(header->addr2, priv->bssid);
+	default:
+		return 1;
+	}
+}
 
 static void iwl3945_add_radiotap(struct iwl3945_priv *priv,
 				 struct sk_buff *skb,
@@ -608,12 +625,12 @@ static void iwl3945_add_radiotap(struct iwl3945_priv *priv,
 	stats->flag |= RX_FLAG_RADIOTAP;
 }
 
-static void iwl3945_handle_data_packet(struct iwl3945_priv *priv, int is_data,
+static void iwl3945_pass_packet_to_mac80211(struct iwl3945_priv *priv,
 				   struct iwl3945_rx_mem_buffer *rxb,
 				   struct ieee80211_rx_status *stats)
 {
-	struct ieee80211_hdr *hdr;
 	struct iwl3945_rx_packet *pkt = (struct iwl3945_rx_packet *)rxb->skb->data;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)IWL_RX_DATA(pkt);
 	struct iwl3945_rx_frame_hdr *rx_hdr = IWL_RX_HDR(pkt);
 	struct iwl3945_rx_frame_end *rx_end = IWL_RX_END(pkt);
 	short len = le16_to_cpu(rx_hdr->len);
@@ -635,8 +652,6 @@ static void iwl3945_handle_data_packet(struct iwl3945_priv *priv, int is_data,
 	/* Set the size of the skb to the size of the frame */
 	skb_put(rxb->skb, le16_to_cpu(rx_hdr->len));
 
-	hdr = (void *)rxb->skb->data;
-
 	if (iwl3945_param_hwcrypto)
 		iwl3945_set_decrypted_flag(priv, rxb->skb,
 				       le32_to_cpu(rx_end->status), stats);
@@ -645,7 +660,7 @@ static void iwl3945_handle_data_packet(struct iwl3945_priv *priv, int is_data,
 		iwl3945_add_radiotap(priv, rxb->skb, rx_hdr, stats);
 
 #ifdef CONFIG_IWL3945_LEDS
-	if (is_data)
+	if (ieee80211_is_data(hdr->frame_control))
 		priv->rxtxpackets += len;
 #endif
 	ieee80211_rx_irqsafe(priv->hw, rxb->skb, stats);
@@ -694,7 +709,7 @@ static void iwl3945_rx_reply_rx(struct iwl3945_priv *priv,
 	}
 
 	if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR) {
-		iwl3945_handle_data_packet(priv, 1, rxb, &rx_status);
+		iwl3945_pass_packet_to_mac80211(priv, rxb, &rx_status);
 		return;
 	}
 
@@ -842,27 +857,12 @@ static void iwl3945_rx_reply_rx(struct iwl3945_priv *priv,
 			}
 		}
 
-		iwl3945_handle_data_packet(priv, 0, rxb, &rx_status);
-		break;
-
-	case IEEE80211_FTYPE_CTL:
-		break;
-
-	case IEEE80211_FTYPE_DATA: {
-		DECLARE_MAC_BUF(mac1);
-		DECLARE_MAC_BUF(mac2);
-		DECLARE_MAC_BUF(mac3);
-
-		if (unlikely(iwl3945_is_duplicate_packet(priv, header)))
-			IWL_DEBUG_DROP("Dropping (dup): %s, %s, %s\n",
-				       print_mac(mac1, header->addr1),
-				       print_mac(mac2, header->addr2),
-				       print_mac(mac3, header->addr3));
-		else
-			iwl3945_handle_data_packet(priv, 1, rxb, &rx_status);
+	case IEEE80211_FTYPE_DATA:
+		/* fall through */
+	default:
+		iwl3945_pass_packet_to_mac80211(priv, rxb, &rx_status);
 		break;
 	}
-	}
 }
 
 int iwl3945_hw_txq_attach_buf_to_tfd(struct iwl3945_priv *priv, void *ptr,

drivers/net/wireless/iwlwifi/iwl-3945.h

@@ -510,8 +510,6 @@ struct iwl3945_ucode {
 	u8 data[0];		/* data in same order as "size" elements */
 };
 
-#define IWL_IBSS_MAC_HASH_SIZE 32
-
 struct iwl3945_ibss_seq {
 	u8 mac[ETH_ALEN];
 	u16 seq_num;
@@ -569,17 +567,8 @@ extern int iwl3945_send_add_station(struct iwl3945_priv *priv,
 				struct iwl3945_addsta_cmd *sta, u8 flags);
 extern u8 iwl3945_add_station(struct iwl3945_priv *priv, const u8 *bssid,
 			  int is_ap, u8 flags);
-extern int iwl3945_is_network_packet(struct iwl3945_priv *priv,
-				 struct ieee80211_hdr *header);
 extern int iwl3945_power_init_handle(struct iwl3945_priv *priv);
 extern int iwl3945_eeprom_init(struct iwl3945_priv *priv);
-extern void iwl3945_handle_data_packet_monitor(struct iwl3945_priv *priv,
-					   struct iwl3945_rx_mem_buffer *rxb,
-					   void *data, short len,
-					   struct ieee80211_rx_status *stats,
-					   u16 phy_flags);
-extern int iwl3945_is_duplicate_packet(struct iwl3945_priv *priv,
-				       struct ieee80211_hdr *header);
 extern int iwl3945_rx_queue_alloc(struct iwl3945_priv *priv);
 extern void iwl3945_rx_queue_reset(struct iwl3945_priv *priv,
 			       struct iwl3945_rx_queue *rxq);
@@ -859,14 +848,6 @@ struct iwl3945_priv {
 	u32 last_beacon_time;
 	u64 last_tsf;
 
-	/* Duplicate packet detection */
-	u16 last_seq_num;
-	u16 last_frag_num;
-	unsigned long last_packet_time;
-
-	/* Hash table for finding stations in IBSS network */
-	struct list_head ibss_mac_hash[IWL_IBSS_MAC_HASH_SIZE];
-
 	/* eeprom */
 	struct iwl3945_eeprom eeprom;
 

drivers/net/wireless/iwlwifi/iwl-dev.h

@@ -490,8 +490,6 @@ struct iwl_ucode {
 	u8 data[0];		/* data in same order as "size" elements */
 };
 
-#define IWL_IBSS_MAC_HASH_SIZE 32
-
 struct iwl4965_ibss_seq {
 	u8 mac[ETH_ALEN];
 	u16 seq_num;

drivers/net/wireless/iwlwifi/iwl3945-base.c

@@ -2035,36 +2035,6 @@ static int iwl3945_send_power_mode(struct iwl3945_priv *priv, u32 mode)
 	return rc;
 }
 
-int iwl3945_is_network_packet(struct iwl3945_priv *priv, struct ieee80211_hdr *header)
-{
-	/* Filter incoming packets to determine if they are targeted toward
-	 * this network, discarding packets coming from ourselves */
-	switch (priv->iw_mode) {
-	case IEEE80211_IF_TYPE_IBSS: /* Header: Dest. | Source    | BSSID */
-		/* packets from our adapter are dropped (echo) */
-		if (!compare_ether_addr(header->addr2, priv->mac_addr))
-			return 0;
-		/* {broad,multi}cast packets to our IBSS go through */
-		if (is_multicast_ether_addr(header->addr1))
-			return !compare_ether_addr(header->addr3, priv->bssid);
-		/* packets to our adapter go through */
-		return !compare_ether_addr(header->addr1, priv->mac_addr);
-	case IEEE80211_IF_TYPE_STA: /* Header: Dest. | AP{BSSID} | Source */
-		/* packets from our adapter are dropped (echo) */
-		if (!compare_ether_addr(header->addr3, priv->mac_addr))
-			return 0;
-		/* {broad,multi}cast packets to our BSS go through */
-		if (is_multicast_ether_addr(header->addr1))
-			return !compare_ether_addr(header->addr2, priv->bssid);
-		/* packets to our adapter go through */
-		return !compare_ether_addr(header->addr1, priv->mac_addr);
-	default:
-		return 1;
-	}
-
-	return 1;
-}
-
 /**
  * iwl3945_scan_cancel - Cancel any currently executing HW scan
  *
@@ -2117,20 +2087,6 @@ static int iwl3945_scan_cancel_timeout(struct iwl3945_priv *priv, unsigned long
 	return ret;
 }
 
-static void iwl3945_sequence_reset(struct iwl3945_priv *priv)
-{
-	/* Reset ieee stats */
-
-	/* We don't reset the net_device_stats (ieee->stats) on
-	 * re-association */
-
-	priv->last_seq_num = -1;
-	priv->last_frag_num = -1;
-	priv->last_packet_time = 0;
-
-	iwl3945_scan_cancel(priv);
-}
-
 #define MAX_UCODE_BEACON_INTERVAL	1024
 #define INTEL_CONN_LISTEN_INTERVAL	__constant_cpu_to_le16(0xA)
 
@@ -2925,72 +2881,6 @@ void iwl3945_set_decrypted_flag(struct iwl3945_priv *priv, struct sk_buff *skb,
 	}
 }
 
-#define IWL_PACKET_RETRY_TIME HZ
-
-int iwl3945_is_duplicate_packet(struct iwl3945_priv *priv, struct ieee80211_hdr *header)
-{
-	u16 sc = le16_to_cpu(header->seq_ctrl);
-	u16 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
-	u16 frag = sc & IEEE80211_SCTL_FRAG;
-	u16 *last_seq, *last_frag;
-	unsigned long *last_time;
-
-	switch (priv->iw_mode) {
-	case IEEE80211_IF_TYPE_IBSS:{
-		struct list_head *p;
-		struct iwl3945_ibss_seq *entry = NULL;
-		u8 *mac = header->addr2;
-		int index = mac[5] & (IWL_IBSS_MAC_HASH_SIZE - 1);
-
-		__list_for_each(p, &priv->ibss_mac_hash[index]) {
-			entry = list_entry(p, struct iwl3945_ibss_seq, list);
-			if (!compare_ether_addr(entry->mac, mac))
-				break;
-		}
-		if (p == &priv->ibss_mac_hash[index]) {
-			entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
-			if (!entry) {
-				IWL_ERROR("Cannot malloc new mac entry\n");
-				return 0;
-			}
-			memcpy(entry->mac, mac, ETH_ALEN);
-			entry->seq_num = seq;
-			entry->frag_num = frag;
-			entry->packet_time = jiffies;
-			list_add(&entry->list, &priv->ibss_mac_hash[index]);
-			return 0;
-		}
-		last_seq = &entry->seq_num;
-		last_frag = &entry->frag_num;
-		last_time = &entry->packet_time;
-		break;
-	}
-	case IEEE80211_IF_TYPE_STA:
-		last_seq = &priv->last_seq_num;
-		last_frag = &priv->last_frag_num;
-		last_time = &priv->last_packet_time;
-		break;
-	default:
-		return 0;
-	}
-	if ((*last_seq == seq) &&
-	    time_after(*last_time + IWL_PACKET_RETRY_TIME, jiffies)) {
-		if (*last_frag == frag)
-			goto drop;
-		if (*last_frag + 1 != frag)
-			/* out-of-order fragment */
-			goto drop;
-	} else
-		*last_seq = seq;
-
-	*last_frag = frag;
-	*last_time = jiffies;
-	return 0;
-
- drop:
-	return 1;
-}
-
 #ifdef CONFIG_IWL3945_SPECTRUM_MEASUREMENT
 
 #include "iwl-spectrum.h"
@@ -6531,8 +6421,6 @@ static void iwl3945_bg_post_associate(struct work_struct *data)
 		break;
 	}
 
-	iwl3945_sequence_reset(priv);
-
 	iwl3945_activate_qos(priv, 0);
 
 	/* we have just associated, don't start scan too early */
@@ -7963,7 +7851,6 @@ static int iwl3945_pci_probe(struct pci_dev *pdev, const struct pci_device_id *e
 	struct iwl3945_priv *priv;
 	struct ieee80211_hw *hw;
 	struct iwl_3945_cfg *cfg = (struct iwl_3945_cfg *)(ent->driver_data);
-	int i;
 	unsigned long flags;
 	DECLARE_MAC_BUF(mac);
 
@@ -8024,9 +7911,6 @@ static int iwl3945_pci_probe(struct pci_dev *pdev, const struct pci_device_id *e
 	spin_lock_init(&priv->sta_lock);
 	spin_lock_init(&priv->hcmd_lock);
 
-	for (i = 0; i < IWL_IBSS_MAC_HASH_SIZE; i++)
-		INIT_LIST_HEAD(&priv->ibss_mac_hash[i]);
-
 	INIT_LIST_HEAD(&priv->free_frames);
 
 	mutex_init(&priv->mutex);
@@ -8199,8 +8083,6 @@ static int iwl3945_pci_probe(struct pci_dev *pdev, const struct pci_device_id *e
 static void __devexit iwl3945_pci_remove(struct pci_dev *pdev)
 {
 	struct iwl3945_priv *priv = pci_get_drvdata(pdev);
-	struct list_head *p, *q;
-	int i;
 	unsigned long flags;
 
 	if (!priv)
@@ -8221,14 +8103,6 @@ static void __devexit iwl3945_pci_remove(struct pci_dev *pdev)
 
 	iwl_synchronize_irq(priv);
 
-	/* Free MAC hash list for ADHOC */
-	for (i = 0; i < IWL_IBSS_MAC_HASH_SIZE; i++) {
-		list_for_each_safe(p, q, &priv->ibss_mac_hash[i]) {
-			list_del(p);
-			kfree(list_entry(p, struct iwl3945_ibss_seq, list));
-		}
-	}
-
 	sysfs_remove_group(&pdev->dev.kobj, &iwl3945_attribute_group);
 
 	iwl3945_rfkill_unregister(priv);