2 files changed, 51 insertions, 1 deletions

diff --git a/drivers/net/ethernet/atheros/alx/alx.h b/drivers/net/ethernet/atheros/alx/alx.h
index 8fc93c5f6abc..d02c4240b7df 100644
--- a/drivers/net/ethernet/atheros/alx/alx.h
+++ b/drivers/net/ethernet/atheros/alx/alx.h
@@ -96,6 +96,10 @@ struct alx_priv {
 	unsigned int rx_ringsz;
 	unsigned int rxbuf_size;
 
+	struct page  *rx_page;
+	unsigned int rx_page_offset;
+	unsigned int rx_frag_size;
+
 	struct napi_struct napi;
 	struct alx_tx_queue txq;
 	struct alx_rx_queue rxq;
diff --git a/drivers/net/ethernet/atheros/alx/main.c b/drivers/net/ethernet/atheros/alx/main.c
index 9fe8b5e310d1..c98acdc0d14f 100644
--- a/drivers/net/ethernet/atheros/alx/main.c
+++ b/drivers/net/ethernet/atheros/alx/main.c
@@ -70,6 +70,35 @@ static void alx_free_txbuf(struct alx_priv *alx, int entry)
 	}
 }
 
+static struct sk_buff *alx_alloc_skb(struct alx_priv *alx, gfp_t gfp)
+{
+	struct sk_buff *skb;
+	struct page *page;
+
+	if (alx->rx_frag_size > PAGE_SIZE)
+		return __netdev_alloc_skb(alx->dev, alx->rxbuf_size, gfp);
+
+	page = alx->rx_page;
+	if (!page) {
+		alx->rx_page = page = alloc_page(gfp);
+		if (unlikely(!page))
+			return NULL;
+		alx->rx_page_offset = 0;
+	}
+
+	skb = build_skb(page_address(page) + alx->rx_page_offset,
+			alx->rx_frag_size);
+	if (likely(skb)) {
+		alx->rx_page_offset += alx->rx_frag_size;
+		if (alx->rx_page_offset >= PAGE_SIZE)
+			alx->rx_page = NULL;
+		else
+			get_page(page);
+	}
+	return skb;
+}
+
+
 static int alx_refill_rx_ring(struct alx_priv *alx, gfp_t gfp)
 {
 	struct alx_rx_queue *rxq = &alx->rxq;
@@ -86,7 +115,7 @@ static int alx_refill_rx_ring(struct alx_priv *alx, gfp_t gfp)
 	while (!cur_buf->skb && next != rxq->read_idx) {
 		struct alx_rfd *rfd = &rxq->rfd[cur];
 
-		skb = __netdev_alloc_skb(alx->dev, alx->rxbuf_size, gfp);
+		skb = alx_alloc_skb(alx, gfp);
 		if (!skb)
 			break;
 		dma = dma_map_single(&alx->hw.pdev->dev,
@@ -124,6 +153,7 @@ static int alx_refill_rx_ring(struct alx_priv *alx, gfp_t gfp)
 		alx_write_mem16(&alx->hw, ALX_RFD_PIDX, cur);
 	}
 
+
 	return count;
 }
 
@@ -592,6 +622,11 @@ static void alx_free_rings(struct alx_priv *alx)
 	kfree(alx->txq.bufs);
 	kfree(alx->rxq.bufs);
 
+	if (alx->rx_page) {
+		put_page(alx->rx_page);
+		alx->rx_page = NULL;
+	}
+
 	dma_free_coherent(&alx->hw.pdev->dev,
 			  alx->descmem.size,
 			  alx->descmem.virt,
@@ -646,6 +681,7 @@ static int alx_request_irq(struct alx_priv *alx)
 				  alx->dev->name, alx);
 		if (!err)
 			goto out;
+
 		/* fall back to legacy interrupt */
 		pci_disable_msi(alx->hw.pdev);
 	}
@@ -689,6 +725,7 @@ static int alx_init_sw(struct alx_priv *alx)
 	struct pci_dev *pdev = alx->hw.pdev;
 	struct alx_hw *hw = &alx->hw;
 	int err;
+	unsigned int head_size;
 
 	err = alx_identify_hw(alx);
 	if (err) {
@@ -704,7 +741,12 @@ static int alx_init_sw(struct alx_priv *alx)
 
 	hw->smb_timer = 400;
 	hw->mtu = alx->dev->mtu;
+
 	alx->rxbuf_size = ALX_MAX_FRAME_LEN(hw->mtu);
+	head_size = SKB_DATA_ALIGN(alx->rxbuf_size + NET_SKB_PAD) +
+		    SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
+	alx->rx_frag_size = roundup_pow_of_two(head_size);
+
 	alx->tx_ringsz = 256;
 	alx->rx_ringsz = 512;
 	hw->imt = 200;
@@ -806,6 +848,7 @@ static int alx_change_mtu(struct net_device *netdev, int mtu)
 {
 	struct alx_priv *alx = netdev_priv(netdev);
 	int max_frame = ALX_MAX_FRAME_LEN(mtu);
+	unsigned int head_size;
 
 	if ((max_frame < ALX_MIN_FRAME_SIZE) ||
 	    (max_frame > ALX_MAX_FRAME_SIZE))
@@ -817,6 +860,9 @@ static int alx_change_mtu(struct net_device *netdev, int mtu)
 	netdev->mtu = mtu;
 	alx->hw.mtu = mtu;
 	alx->rxbuf_size = max(max_frame, ALX_DEF_RXBUF_SIZE);
+	head_size = SKB_DATA_ALIGN(alx->rxbuf_size + NET_SKB_PAD) +
+		    SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
+	alx->rx_frag_size = roundup_pow_of_two(head_size);
 	netdev_update_features(netdev);
 	if (netif_running(netdev))
 		alx_reinit(alx);