1 files changed, 151 insertions, 67 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-rx.c b/drivers/net/wireless/iwlwifi/iwl-rx.c
index 493626bcd3ec..6090bc15a6d5 100644
--- a/drivers/net/wireless/iwlwifi/iwl-rx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-rx.c
@@ -140,6 +140,8 @@ int iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q)
 		reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
 
 		if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
+			IWL_DEBUG_INFO(priv, "Rx queue requesting wakeup, GP1 = 0x%x\n",
+				      reg);
 			iwl_set_bit(priv, CSR_GP_CNTRL,
 				    CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 			goto exit_unlock;
@@ -200,7 +202,7 @@ int iwl_rx_queue_restock(struct iwl_priv *priv)
 		list_del(element);
 
 		/* Point to Rx buffer via next RBD in circular buffer */
-		rxq->bd[rxq->write] = iwl_dma_addr2rbd_ptr(priv, rxb->aligned_dma_addr);
+		rxq->bd[rxq->write] = iwl_dma_addr2rbd_ptr(priv, rxb->page_dma);
 		rxq->queue[rxq->write] = rxb;
 		rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
 		rxq->free_count--;
@@ -239,8 +241,9 @@ void iwl_rx_allocate(struct iwl_priv *priv, gfp_t priority)
 	struct iwl_rx_queue *rxq = &priv->rxq;
 	struct list_head *element;
 	struct iwl_rx_mem_buffer *rxb;
-	struct sk_buff *skb;
+	struct page *page;
 	unsigned long flags;
+	gfp_t gfp_mask = priority;
 
 	while (1) {
 		spin_lock_irqsave(&rxq->lock, flags);
@@ -251,30 +254,35 @@ void iwl_rx_allocate(struct iwl_priv *priv, gfp_t priority)
 		spin_unlock_irqrestore(&rxq->lock, flags);
 
 		if (rxq->free_count > RX_LOW_WATERMARK)
-			priority |= __GFP_NOWARN;
-		/* Alloc a new receive buffer */
-		skb = alloc_skb(priv->hw_params.rx_buf_size + 256,
-						priority);
+			gfp_mask |= __GFP_NOWARN;
+
+		if (priv->hw_params.rx_page_order > 0)
+			gfp_mask |= __GFP_COMP;
 
-		if (!skb) {
+		/* Alloc a new receive buffer */
+		page = alloc_pages(gfp_mask, priv->hw_params.rx_page_order);
+		if (!page) {
 			if (net_ratelimit())
-				IWL_DEBUG_INFO(priv, "Failed to allocate SKB buffer.\n");
+				IWL_DEBUG_INFO(priv, "alloc_pages failed, "
+					       "order: %d\n",
+					       priv->hw_params.rx_page_order);
+
 			if ((rxq->free_count <= RX_LOW_WATERMARK) &&
 			    net_ratelimit())
-				IWL_CRIT(priv, "Failed to allocate SKB buffer with %s. Only %u free buffers remaining.\n",
+				IWL_CRIT(priv, "Failed to alloc_pages with %s. Only %u free buffers remaining.\n",
 					 priority == GFP_ATOMIC ?  "GFP_ATOMIC" : "GFP_KERNEL",
 					 rxq->free_count);
 			/* We don't reschedule replenish work here -- we will
 			 * call the restock method and if it still needs
 			 * more buffers it will schedule replenish */
-			break;
+			return;
 		}
 
 		spin_lock_irqsave(&rxq->lock, flags);
 
 		if (list_empty(&rxq->rx_used)) {
 			spin_unlock_irqrestore(&rxq->lock, flags);
-			dev_kfree_skb_any(skb);
+			__free_pages(page, priv->hw_params.rx_page_order);
 			return;
 		}
 		element = rxq->rx_used.next;
@@ -283,24 +291,21 @@ void iwl_rx_allocate(struct iwl_priv *priv, gfp_t priority)
 
 		spin_unlock_irqrestore(&rxq->lock, flags);
 
-		rxb->skb = skb;
-		/* Get physical address of RB/SKB */
-		rxb->real_dma_addr = pci_map_single(
-					priv->pci_dev,
-					rxb->skb->data,
-					priv->hw_params.rx_buf_size + 256,
-					PCI_DMA_FROMDEVICE);
+		rxb->page = page;
+		/* Get physical address of the RB */
+		rxb->page_dma = pci_map_page(priv->pci_dev, page, 0,
+				PAGE_SIZE << priv->hw_params.rx_page_order,
+				PCI_DMA_FROMDEVICE);
 		/* dma address must be no more than 36 bits */
-		BUG_ON(rxb->real_dma_addr & ~DMA_BIT_MASK(36));
+		BUG_ON(rxb->page_dma & ~DMA_BIT_MASK(36));
 		/* and also 256 byte aligned! */
-		rxb->aligned_dma_addr = ALIGN(rxb->real_dma_addr, 256);
-		skb_reserve(rxb->skb, rxb->aligned_dma_addr - rxb->real_dma_addr);
+		BUG_ON(rxb->page_dma & DMA_BIT_MASK(8));
 
 		spin_lock_irqsave(&rxq->lock, flags);
 
 		list_add_tail(&rxb->list, &rxq->rx_free);
 		rxq->free_count++;
-		priv->alloc_rxb_skb++;
+		priv->alloc_rxb_page++;
 
 		spin_unlock_irqrestore(&rxq->lock, flags);
 	}
@@ -336,12 +341,14 @@ void iwl_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 {
 	int i;
 	for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
-		if (rxq->pool[i].skb != NULL) {
-			pci_unmap_single(priv->pci_dev,
-					 rxq->pool[i].real_dma_addr,
-					 priv->hw_params.rx_buf_size + 256,
-					 PCI_DMA_FROMDEVICE);
-			dev_kfree_skb(rxq->pool[i].skb);
+		if (rxq->pool[i].page != NULL) {
+			pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
+				PAGE_SIZE << priv->hw_params.rx_page_order,
+				PCI_DMA_FROMDEVICE);
+			__free_pages(rxq->pool[i].page,
+				     priv->hw_params.rx_page_order);
+			rxq->pool[i].page = NULL;
+			priv->alloc_rxb_page--;
 		}
 	}
 
@@ -405,14 +412,14 @@ void iwl_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 	for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
 		/* In the reset function, these buffers may have been allocated
 		 * to an SKB, so we need to unmap and free potential storage */
-		if (rxq->pool[i].skb != NULL) {
-			pci_unmap_single(priv->pci_dev,
-					 rxq->pool[i].real_dma_addr,
-					 priv->hw_params.rx_buf_size + 256,
-					 PCI_DMA_FROMDEVICE);
-			priv->alloc_rxb_skb--;
-			dev_kfree_skb(rxq->pool[i].skb);
-			rxq->pool[i].skb = NULL;
+		if (rxq->pool[i].page != NULL) {
+			pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
+				PAGE_SIZE << priv->hw_params.rx_page_order,
+				PCI_DMA_FROMDEVICE);
+			priv->alloc_rxb_page--;
+			__free_pages(rxq->pool[i].page,
+				     priv->hw_params.rx_page_order);
+			rxq->pool[i].page = NULL;
 		}
 		list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
 	}
@@ -470,7 +477,8 @@ int iwl_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 			   (rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
 			   (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));
 
-	iwl_write32(priv, CSR_INT_COALESCING, 0x40);
+	/* Set interrupt coalescing timer to 64 x 32 = 2048 usecs */
+	iwl_write8(priv, CSR_INT_COALESCING, 0x40);
 
 	return 0;
 }
@@ -491,7 +499,7 @@ void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
 				struct iwl_rx_mem_buffer *rxb)
 
 {
-	struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
+	struct iwl_rx_packet *pkt = rxb_addr(rxb);
 	struct iwl_missed_beacon_notif *missed_beacon;
 
 	missed_beacon = &pkt->u.missed_beacon;
@@ -548,13 +556,51 @@ static void iwl_rx_calc_noise(struct iwl_priv *priv)
 			priv->last_rx_noise);
 }
 
+#ifdef CONFIG_IWLWIFI_DEBUG
+/*
+ *  based on the assumption of all statistics counter are in DWORD
+ *  FIXME: This function is for debugging, do not deal with
+ *  the case of counters roll-over.
+ */
+static void iwl_accumulative_statistics(struct iwl_priv *priv,
+					__le32 *stats)
+{
+	int i;
+	__le32 *prev_stats;
+	u32 *accum_stats;
+
+	prev_stats = (__le32 *)&priv->statistics;
+	accum_stats = (u32 *)&priv->accum_statistics;
+
+	for (i = sizeof(__le32); i < sizeof(struct iwl_notif_statistics);
+	     i += sizeof(__le32), stats++, prev_stats++, accum_stats++)
+		if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats))
+			*accum_stats += (le32_to_cpu(*stats) -
+				le32_to_cpu(*prev_stats));
+
+	/* reset accumulative statistics for "no-counter" type statistics */
+	priv->accum_statistics.general.temperature =
+		priv->statistics.general.temperature;
+	priv->accum_statistics.general.temperature_m =
+		priv->statistics.general.temperature_m;
+	priv->accum_statistics.general.ttl_timestamp =
+		priv->statistics.general.ttl_timestamp;
+	priv->accum_statistics.tx.tx_power.ant_a =
+		priv->statistics.tx.tx_power.ant_a;
+	priv->accum_statistics.tx.tx_power.ant_b =
+		priv->statistics.tx.tx_power.ant_b;
+	priv->accum_statistics.tx.tx_power.ant_c =
+		priv->statistics.tx.tx_power.ant_c;
+}
+#endif
+
 #define REG_RECALIB_PERIOD (60)
 
 void iwl_rx_statistics(struct iwl_priv *priv,
 			      struct iwl_rx_mem_buffer *rxb)
 {
 	int change;
-	struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
+	struct iwl_rx_packet *pkt = rxb_addr(rxb);
 
 	IWL_DEBUG_RX(priv, "Statistics notification received (%d vs %d).\n",
 		     (int)sizeof(priv->statistics),
@@ -566,6 +612,9 @@ void iwl_rx_statistics(struct iwl_priv *priv,
 		    STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 		   (pkt->u.stats.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 
+#ifdef CONFIG_IWLWIFI_DEBUG
+	iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
+#endif
 	memcpy(&priv->statistics, &pkt->u.stats, sizeof(priv->statistics));
 
 	set_bit(STATUS_STATISTICS, &priv->status);
@@ -582,14 +631,29 @@ void iwl_rx_statistics(struct iwl_priv *priv,
 		iwl_rx_calc_noise(priv);
 		queue_work(priv->workqueue, &priv->run_time_calib_work);
 	}
-
-	iwl_leds_background(priv);
-
 	if (priv->cfg->ops->lib->temp_ops.temperature && change)
 		priv->cfg->ops->lib->temp_ops.temperature(priv);
 }
 EXPORT_SYMBOL(iwl_rx_statistics);
 
+void iwl_reply_statistics(struct iwl_priv *priv,
+			      struct iwl_rx_mem_buffer *rxb)
+{
+	struct iwl_rx_packet *pkt = rxb_addr(rxb);
+
+	if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
+		memset(&priv->statistics, 0,
+			sizeof(struct iwl_notif_statistics));
+#ifdef CONFIG_IWLWIFI_DEBUG
+		memset(&priv->accum_statistics, 0,
+			sizeof(struct iwl_notif_statistics));
+#endif
+		IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
+	}
+	iwl_rx_statistics(priv, rxb);
+}
+EXPORT_SYMBOL(iwl_reply_statistics);
+
 #define PERFECT_RSSI (-20) /* dBm */
 #define WORST_RSSI (-95)   /* dBm */
 #define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
@@ -878,6 +942,10 @@ static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
 					struct iwl_rx_mem_buffer *rxb,
 					struct ieee80211_rx_status *stats)
 {
+	struct sk_buff *skb;
+	int ret = 0;
+	__le16 fc = hdr->frame_control;
+
 	/* We only process data packets if the interface is open */
 	if (unlikely(!priv->is_open)) {
 		IWL_DEBUG_DROP_LIMIT(priv,
@@ -890,15 +958,44 @@ static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
 	    iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
 		return;
 
-	/* Resize SKB from mac header to end of packet */
-	skb_reserve(rxb->skb, (void *)hdr - (void *)rxb->skb->data);
-	skb_put(rxb->skb, len);
+	skb = alloc_skb(IWL_LINK_HDR_MAX * 2, GFP_ATOMIC);
+	if (!skb) {
+		IWL_ERR(priv, "alloc_skb failed\n");
+		return;
+	}
+
+	skb_reserve(skb, IWL_LINK_HDR_MAX);
+	skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
+
+	/* mac80211 currently doesn't support paged SKB. Convert it to
+	 * linear SKB for management frame and data frame requires
+	 * software decryption or software defragementation. */
+	if (ieee80211_is_mgmt(fc) ||
+	    ieee80211_has_protected(fc) ||
+	    ieee80211_has_morefrags(fc) ||
+	    le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG)
+		ret = skb_linearize(skb);
+	else
+		ret = __pskb_pull_tail(skb, min_t(u16, IWL_LINK_HDR_MAX, len)) ?
+			 0 : -ENOMEM;
+
+	if (ret) {
+		kfree_skb(skb);
+		goto out;
+	}
+
+	/*
+	 * XXX: We cannot touch the page and its virtual memory (hdr) after
+	 * here. It might have already been freed by the above skb change.
+	 */
 
-	iwl_update_stats(priv, false, hdr->frame_control, len);
-	memcpy(IEEE80211_SKB_RXCB(rxb->skb), stats, sizeof(*stats));
-	ieee80211_rx_irqsafe(priv->hw, rxb->skb);
-	priv->alloc_rxb_skb--;
-	rxb->skb = NULL;
+	iwl_update_stats(priv, false, fc, len);
+	memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
+
+	ieee80211_rx(priv->hw, skb);
+ out:
+	priv->alloc_rxb_page--;
+	rxb->page = NULL;
 }
 
 /* This is necessary only for a number of statistics, see the caller. */
@@ -926,13 +1023,12 @@ void iwl_rx_reply_rx(struct iwl_priv *priv,
 {
 	struct ieee80211_hdr *header;
 	struct ieee80211_rx_status rx_status;
-	struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
+	struct iwl_rx_packet *pkt = rxb_addr(rxb);
 	struct iwl_rx_phy_res *phy_res;
 	__le32 rx_pkt_status;
 	struct iwl4965_rx_mpdu_res_start *amsdu;
 	u32 len;
 	u32 ampdu_status;
-	u16 fc;
 	u32 rate_n_flags;
 
 	/**
@@ -1065,20 +1161,8 @@ void iwl_rx_reply_rx(struct iwl_priv *priv,
 		priv->last_tsf = le64_to_cpu(phy_res->timestamp);
 	}
 
-	fc = le16_to_cpu(header->frame_control);
-	switch (fc & IEEE80211_FCTL_FTYPE) {
-	case IEEE80211_FTYPE_MGMT:
-	case IEEE80211_FTYPE_DATA:
-		if (priv->iw_mode == NL80211_IFTYPE_AP)
-			iwl_update_ps_mode(priv, fc  & IEEE80211_FCTL_PM,
-						header->addr2);
-		/* fall through */
-	default:
-		iwl_pass_packet_to_mac80211(priv, header, len, ampdu_status,
-				rxb, &rx_status);
-		break;
-
-	}
+	iwl_pass_packet_to_mac80211(priv, header, len, ampdu_status,
+				    rxb, &rx_status);
 }
 EXPORT_SYMBOL(iwl_rx_reply_rx);
 
@@ -1087,7 +1171,7 @@ EXPORT_SYMBOL(iwl_rx_reply_rx);
 void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
 				    struct iwl_rx_mem_buffer *rxb)
 {
-	struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
+	struct iwl_rx_packet *pkt = rxb_addr(rxb);
 	priv->last_phy_res[0] = 1;
 	memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
 	       sizeof(struct iwl_rx_phy_res));