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Date: Fri, 15 Oct 2010 14:15:17 +0200
From: Stanislaw Gruszka <sgruszka@...hat.com>
To: Francois Romieu <romieu@...zoreil.com>, netdev@...r.kernel.org
Cc: Denis Kirjanov <kirjanov@...il.com>,
Stanislaw Gruszka <sgruszka@...hat.com>
Subject: [PATCH 1/6] r8169: check dma mapping failures
Check possible dma mapping errors and do clean up if it happens,
when sending frames stop the tx queue.
Fix overwrap bug in rtl8169_tx_clear on the way.
Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
---
All patches in series was tested on RTL8111/8168B
drivers/net/r8169.c | 69 ++++++++++++++++++++++++++++++++++-----------------
1 files changed, 46 insertions(+), 23 deletions(-)
diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index bc669a4..a6c4f90 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -4018,20 +4018,25 @@ static struct sk_buff *rtl8169_alloc_rx_skb(struct pci_dev *pdev,
skb = __netdev_alloc_skb(dev, rx_buf_sz + pad, gfp);
if (!skb)
- goto err_out;
+ goto err_out_0;
skb_reserve(skb, align ? ((pad - 1) & (unsigned long)skb->data) : pad);
mapping = dma_map_single(&pdev->dev, skb->data, rx_buf_sz,
PCI_DMA_FROMDEVICE);
+ if (dma_mapping_error(&pdev->dev, mapping))
+ goto err_free_skb_1;
rtl8169_map_to_asic(desc, mapping, rx_buf_sz);
-out:
+
return skb;
-err_out:
+err_free_skb_1:
+ dev_kfree_skb(skb);
+
+err_out_0:
rtl8169_make_unusable_by_asic(desc);
- goto out;
+ return NULL;
}
static void rtl8169_rx_clear(struct rtl8169_private *tp)
@@ -4115,12 +4120,12 @@ static void rtl8169_unmap_tx_skb(struct pci_dev *pdev, struct ring_info *tx_skb,
tx_skb->len = 0;
}
-static void rtl8169_tx_clear(struct rtl8169_private *tp)
+static void rtl8169_tx_clear_range(struct rtl8169_private *tp, u32 start, int n)
{
- unsigned int i;
+ int i;
- for (i = tp->dirty_tx; i < tp->dirty_tx + NUM_TX_DESC; i++) {
- unsigned int entry = i % NUM_TX_DESC;
+ for (i = 0; i < n; i++) {
+ unsigned int entry = (start + i) % NUM_TX_DESC;
struct ring_info *tx_skb = tp->tx_skb + entry;
unsigned int len = tx_skb->len;
@@ -4136,6 +4141,11 @@ static void rtl8169_tx_clear(struct rtl8169_private *tp)
tp->dev->stats.tx_dropped++;
}
}
+}
+
+static void rtl8169_tx_clear(struct rtl8169_private *tp)
+{
+ rtl8169_tx_clear_range(tp, tp->dirty_tx, NUM_TX_DESC);
tp->cur_tx = tp->dirty_tx = 0;
}
@@ -4254,6 +4264,8 @@ static int rtl8169_xmit_frags(struct rtl8169_private *tp, struct sk_buff *skb,
addr = ((void *) page_address(frag->page)) + frag->page_offset;
mapping = dma_map_single(&tp->pci_dev->dev, addr, len,
PCI_DMA_TODEVICE);
+ if (unlikely(dma_mapping_error(&tp->pci_dev->dev, mapping)))
+ goto err_out;
/* anti gcc 2.95.3 bugware (sic) */
status = opts1 | len | (RingEnd * !((entry + 1) % NUM_TX_DESC));
@@ -4270,6 +4282,10 @@ static int rtl8169_xmit_frags(struct rtl8169_private *tp, struct sk_buff *skb,
}
return cur_frag;
+
+err_out:
+ rtl8169_tx_clear_range(tp, tp->cur_tx, cur_frag);
+ return -EIO;
}
static inline u32 rtl8169_tso_csum(struct sk_buff *skb, struct net_device *dev)
@@ -4296,40 +4312,44 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct rtl8169_private *tp = netdev_priv(dev);
- unsigned int frags, entry = tp->cur_tx % NUM_TX_DESC;
+ unsigned int entry = tp->cur_tx % NUM_TX_DESC;
struct TxDesc *txd = tp->TxDescArray + entry;
void __iomem *ioaddr = tp->mmio_addr;
dma_addr_t mapping;
u32 status, len;
u32 opts1;
+ int frags;
if (unlikely(TX_BUFFS_AVAIL(tp) < skb_shinfo(skb)->nr_frags)) {
netif_err(tp, drv, dev, "BUG! Tx Ring full when queue awake!\n");
- goto err_stop;
+ goto err_stop_0;
}
if (unlikely(le32_to_cpu(txd->opts1) & DescOwn))
- goto err_stop;
+ goto err_stop_0;
+
+ len = skb_headlen(skb);
+ mapping = dma_map_single(&tp->pci_dev->dev, skb->data, len,
+ PCI_DMA_TODEVICE);
+ if (unlikely(dma_mapping_error(&tp->pci_dev->dev, mapping)))
+ goto err_stop_0;
+
+ tp->tx_skb[entry].len = len;
+ txd->addr = cpu_to_le64(mapping);
+ txd->opts2 = cpu_to_le32(rtl8169_tx_vlan_tag(tp, skb));
opts1 = DescOwn | rtl8169_tso_csum(skb, dev);
frags = rtl8169_xmit_frags(tp, skb, opts1);
- if (frags) {
- len = skb_headlen(skb);
+ if (frags < 0)
+ goto err_dma_1;
+ else if (frags)
opts1 |= FirstFrag;
- } else {
- len = skb->len;
+ else {
opts1 |= FirstFrag | LastFrag;
tp->tx_skb[entry].skb = skb;
}
- mapping = dma_map_single(&tp->pci_dev->dev, skb->data, len,
- PCI_DMA_TODEVICE);
-
- tp->tx_skb[entry].len = len;
- txd->addr = cpu_to_le64(mapping);
- txd->opts2 = cpu_to_le32(rtl8169_tx_vlan_tag(tp, skb));
-
wmb();
/* anti gcc 2.95.3 bugware (sic) */
@@ -4351,7 +4371,10 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
return NETDEV_TX_OK;
-err_stop:
+err_dma_1:
+ rtl8169_unmap_tx_skb(tp->pci_dev, tp->tx_skb + entry, txd);
+
+err_stop_0:
netif_stop_queue(dev);
dev->stats.tx_dropped++;
return NETDEV_TX_BUSY;
--
1.7.1
--
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