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[v5,2/2] net: moxa: replace build_skb() with netdev_alloc_skb_ip_align() / memcpy()

Message ID 1408544342-32058-1-git-send-email-jonas.jensen@gmail.com
State Changes Requested, archived
Delegated to: David Miller
Headers show

Commit Message

Jonas Jensen Aug. 20, 2014, 2:19 p.m. UTC 
build_skb() is used to make skbs out of existing RX ring memory
which is bad because the RX ring is allocated only once, on probe.
Memory corruption occur because said memory is reclaimed, i.e.
__kfree_skb() (and eventually put_page()).

Replace build_skb() with netdev_alloc_skb_ip_align(), use memcpy(),
and synchronize DMA memory before passing skb to napi_gro_receive().

Remove SKB_DATA_ALIGN() from RX buffer size while we're at it.

Addresses https://bugzilla.kernel.org/show_bug.cgi?id=69041

Signed-off-by: Jonas Jensen <jonas.jensen@gmail.com>
---

Notes:
    Changes since v4:
    
    1. remove SKB_DATA_ALIGN() from RX buffer size
    
    Applies to next-20140820

 drivers/net/ethernet/moxa/moxart_ether.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)
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Patch

diff --git a/drivers/net/ethernet/moxa/moxart_ether.c b/drivers/net/ethernet/moxa/moxart_ether.c
index aa45607..06a6fce 100644
--- a/drivers/net/ethernet/moxa/moxart_ether.c
+++ b/drivers/net/ethernet/moxa/moxart_ether.c
@@ -226,14 +226,21 @@  static int moxart_rx_poll(struct napi_struct *napi, int budget)
 		if (len > RX_BUF_SIZE)
 			len = RX_BUF_SIZE;
 
-		skb = build_skb(priv->rx_buf[rx_head], priv->rx_buf_size);
+		dma_sync_single_for_cpu(&ndev->dev,
+					priv->rx_mapping[rx_head],
+					priv->rx_buf_size, DMA_FROM_DEVICE);
+		skb = netdev_alloc_skb_ip_align(ndev, len);
 		if (unlikely(!skb)) {
-			net_dbg_ratelimited("build_skb failed\n");
+			net_dbg_ratelimited("netdev_alloc_skb_ip_align failed\n");
 			priv->stats.rx_dropped++;
 			priv->stats.rx_errors++;
 		}
-
+		memcpy(skb->data, priv->rx_buf[rx_head], len);
 		skb_put(skb, len);
+		dma_sync_single_for_device(&ndev->dev,
+					   priv->rx_mapping[rx_head],
+					   priv->rx_buf_size, DMA_FROM_DEVICE);
+
 		skb->protocol = eth_type_trans(skb, ndev);
 		napi_gro_receive(&priv->napi, skb);
 		rx++;
@@ -466,8 +473,7 @@  static int moxart_mac_probe(struct platform_device *pdev)
 	spin_lock_init(&priv->txlock);
 
 	priv->tx_buf_size = TX_BUF_SIZE;
-	priv->rx_buf_size = RX_BUF_SIZE +
-			    SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
+	priv->rx_buf_size = RX_BUF_SIZE;
 
 	priv->tx_desc_base = dma_alloc_coherent(NULL, TX_REG_DESC_SIZE *
 						TX_DESC_NUM, &priv->tx_base,