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Date: Fri, 10 Aug 2007 13:01:02 -0700
From: Auke Kok <auke-jan.h.kok@...el.com>
To: jeff@...zik.org
Cc: netdev@...r.kernel.org, akpm@...ux-foundation.org,
andi@...stfloor.org
Subject: [PATCH 5/6] e1000e: error handling for pci_map_single calls.
Add proper error handling for various callers of pci_map_single.
Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
---
drivers/net/e1000e/e1000.h | 2 ++
drivers/net/e1000e/ethtool.c | 16 +++++++++++---
drivers/net/e1000e/netdev.c | 49 +++++++++++++++++++++++++++++++++++++++---
3 files changed, 61 insertions(+), 6 deletions(-)
diff --git a/drivers/net/e1000e/e1000.h b/drivers/net/e1000e/e1000.h
index 3475e48..e3cd877 100644
--- a/drivers/net/e1000e/e1000.h
+++ b/drivers/net/e1000e/e1000.h
@@ -220,6 +220,7 @@ struct e1000_adapter {
u32 tx_fifo_head;
u32 tx_head_addr;
u32 tx_fifo_size;
+ u32 tx_dma_failed;
/*
* RX
@@ -241,6 +242,7 @@ struct e1000_adapter {
u64 gorcl_old;
u32 gorcl;
u32 alloc_rx_buff_failed;
+ u32 rx_dma_failed;
unsigned int rx_ps_pages;
u16 rx_ps_bsize0;
diff --git a/drivers/net/e1000e/ethtool.c b/drivers/net/e1000e/ethtool.c
index d14cc4b..0e80406 100644
--- a/drivers/net/e1000e/ethtool.c
+++ b/drivers/net/e1000e/ethtool.c
@@ -91,6 +91,8 @@ static const struct e1000_stats e1000_gstrings_stats[] = {
{ "tx_smbus", E1000_STAT(stats.mgptc) },
{ "rx_smbus", E1000_STAT(stats.mgprc) },
{ "dropped_smbus", E1000_STAT(stats.mgpdc) },
+ { "rx_dma_failed", E1000_STAT(rx_dma_failed) },
+ { "tx_dma_failed", E1000_STAT(tx_dma_failed) },
};
#define E1000_GLOBAL_STATS_LEN \
@@ -1042,6 +1044,10 @@ static int e1000_setup_desc_rings(struct e1000_adapter *adapter)
tx_ring->buffer_info[i].dma =
pci_map_single(pdev, skb->data, skb->len,
PCI_DMA_TODEVICE);
+ if (pci_dma_mapping_error(tx_ring->buffer_info[i].dma)) {
+ ret_val = 4;
+ goto err_nomem;
+ }
tx_desc->buffer_addr = cpu_to_le64(
tx_ring->buffer_info[i].dma);
tx_desc->lower.data = cpu_to_le32(skb->len);
@@ -1059,7 +1065,7 @@ static int e1000_setup_desc_rings(struct e1000_adapter *adapter)
size = rx_ring->count * sizeof(struct e1000_buffer);
rx_ring->buffer_info = kmalloc(size, GFP_KERNEL);
if (!rx_ring->buffer_info) {
- ret_val = 4;
+ ret_val = 5;
goto err_nomem;
}
memset(rx_ring->buffer_info, 0, size);
@@ -1068,7 +1074,7 @@ static int e1000_setup_desc_rings(struct e1000_adapter *adapter)
rx_ring->desc = dma_alloc_coherent(&pdev->dev, rx_ring->size,
&rx_ring->dma, GFP_KERNEL);
if (!rx_ring->desc) {
- ret_val = 5;
+ ret_val = 6;
goto err_nomem;
}
memset(rx_ring->desc, 0, rx_ring->size);
@@ -1093,7 +1099,7 @@ static int e1000_setup_desc_rings(struct e1000_adapter *adapter)
skb = alloc_skb(2048 + NET_IP_ALIGN, GFP_KERNEL);
if (!skb) {
- ret_val = 6;
+ ret_val = 7;
goto err_nomem;
}
skb_reserve(skb, NET_IP_ALIGN);
@@ -1101,6 +1107,10 @@ static int e1000_setup_desc_rings(struct e1000_adapter *adapter)
rx_ring->buffer_info[i].dma =
pci_map_single(pdev, skb->data, 2048,
PCI_DMA_FROMDEVICE);
+ if (pci_dma_mapping_error(rx_ring->buffer_info[i].dma)) {
+ ret_val = 8;
+ goto err_nomem;
+ }
rx_desc->buffer_addr =
cpu_to_le64(rx_ring->buffer_info[i].dma);
memset(skb->data, 0x00, skb->len);
diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 51c9024..8ebe238 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -195,6 +195,11 @@ map_skb:
buffer_info->dma = pci_map_single(pdev, skb->data,
adapter->rx_buffer_len,
PCI_DMA_FROMDEVICE);
+ if (pci_dma_mapping_error(buffer_info->dma)) {
+ dev_err(&pdev->dev, "RX DMA map failed\n");
+ adapter->rx_dma_failed++;
+ break;
+ }
rx_desc = E1000_RX_DESC(*rx_ring, i);
rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
@@ -255,6 +260,13 @@ static void e1000_alloc_rx_buffers_ps(struct e1000_adapter *adapter,
ps_page->page,
0, PAGE_SIZE,
PCI_DMA_FROMDEVICE);
+ if (pci_dma_mapping_error(
+ ps_page->dma)) {
+ dev_err(&adapter->pdev->dev,
+ "RX DMA page map failed\n");
+ adapter->rx_dma_failed++;
+ goto no_buffers;
+ }
}
/*
* Refresh the desc even if buffer_addrs
@@ -286,6 +298,14 @@ static void e1000_alloc_rx_buffers_ps(struct e1000_adapter *adapter,
buffer_info->dma = pci_map_single(pdev, skb->data,
adapter->rx_ps_bsize0,
PCI_DMA_FROMDEVICE);
+ if (pci_dma_mapping_error(buffer_info->dma)) {
+ dev_err(&pdev->dev, "RX DMA map failed\n");
+ adapter->rx_dma_failed++;
+ /* cleanup skb */
+ dev_kfree_skb_any(skb);
+ buffer_info->skb = NULL;
+ break;
+ }
rx_desc->read.buffer_addr[0] = cpu_to_le64(buffer_info->dma);
@@ -374,6 +394,11 @@ check_page:
buffer_info->page, 0,
PAGE_SIZE,
PCI_DMA_FROMDEVICE);
+ if (pci_dma_mapping_error(buffer_info->dma)) {
+ dev_err(&adapter->pdev->dev, "RX DMA page map failed\n");
+ adapter->rx_dma_failed++;
+ break;
+ }
rx_desc = E1000_RX_DESC(*rx_ring, i);
rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
@@ -3214,6 +3239,11 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
skb->data + offset,
size,
PCI_DMA_TODEVICE);
+ if (pci_dma_mapping_error(buffer_info->dma)) {
+ dev_err(&adapter->pdev->dev, "TX DMA map failed\n");
+ adapter->tx_dma_failed++;
+ return -1;
+ }
buffer_info->next_to_watch = i;
len -= size;
@@ -3247,6 +3277,13 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
offset,
size,
PCI_DMA_TODEVICE);
+ if (pci_dma_mapping_error(buffer_info->dma)) {
+ dev_err(&adapter->pdev->dev,
+ "TX DMA page map failed\n");
+ adapter->tx_dma_failed++;
+ return -1;
+ }
+
buffer_info->next_to_watch = i;
len -= size;
@@ -3512,9 +3549,15 @@ static int e1000_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
if (skb->protocol == htons(ETH_P_IP))
tx_flags |= E1000_TX_FLAGS_IPV4;
- e1000_tx_queue(adapter, tx_flags,
- e1000_tx_map(adapter, skb, first,
- max_per_txd, nr_frags, mss));
+ count = e1000_tx_map(adapter, skb, first, max_per_txd, nr_frags, mss);
+ if (count < 0) {
+ /* handle pci_map_single() error in e1000_tx_map */
+ dev_kfree_skb_any(skb);
+ spin_unlock_irqrestore(&adapter->tx_queue_lock, irq_flags);
+ return NETDEV_TX_BUSY;
+ }
+
+ e1000_tx_queue(adapter, tx_flags, count);
netdev->trans_start = jiffies;
-
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