skge: check for PCI dma mapping errors
Driver should check for mapping errors.
Machines with limited DMA maps may return an error when a PCI map is
requested (not an issue on standard x86).
Also use upper/lower 32 bits macros for clarity.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/marvell/skge.c b/drivers/net/ethernet/marvell/skge.c
index f580f05..299c33b 100644
--- a/drivers/net/ethernet/marvell/skge.c
+++ b/drivers/net/ethernet/marvell/skge.c
@@ -931,17 +931,20 @@
}
/* Allocate and setup a new buffer for receiving */
-static void skge_rx_setup(struct skge_port *skge, struct skge_element *e,
- struct sk_buff *skb, unsigned int bufsize)
+static int skge_rx_setup(struct pci_dev *pdev,
+ struct skge_element *e,
+ struct sk_buff *skb, unsigned int bufsize)
{
struct skge_rx_desc *rd = e->desc;
- u64 map;
+ dma_addr_t map;
- map = pci_map_single(skge->hw->pdev, skb->data, bufsize,
+ map = pci_map_single(pdev, skb->data, bufsize,
PCI_DMA_FROMDEVICE);
+ if (pci_dma_mapping_error(pdev, map))
+ goto mapping_error;
- rd->dma_lo = map;
- rd->dma_hi = map >> 32;
+ rd->dma_lo = lower_32_bits(map);
+ rd->dma_hi = upper_32_bits(map);
e->skb = skb;
rd->csum1_start = ETH_HLEN;
rd->csum2_start = ETH_HLEN;
@@ -953,6 +956,13 @@
rd->control = BMU_OWN | BMU_STF | BMU_IRQ_EOF | BMU_TCP_CHECK | bufsize;
dma_unmap_addr_set(e, mapaddr, map);
dma_unmap_len_set(e, maplen, bufsize);
+ return 0;
+
+mapping_error:
+ if (net_ratelimit())
+ dev_warn(&pdev->dev, "%s: rx mapping error\n",
+ skb->dev->name);
+ return -EIO;
}
/* Resume receiving using existing skb,
@@ -1014,7 +1024,11 @@
return -ENOMEM;
skb_reserve(skb, NET_IP_ALIGN);
- skge_rx_setup(skge, e, skb, skge->rx_buf_size);
+ if (skge_rx_setup(skge->hw->pdev, e, skb, skge->rx_buf_size)) {
+ kfree_skb(skb);
+ return -ENOMEM;
+ }
+
} while ((e = e->next) != ring->start);
ring->to_clean = ring->start;
@@ -2729,7 +2743,7 @@
struct skge_tx_desc *td;
int i;
u32 control, len;
- u64 map;
+ dma_addr_t map;
if (skb_padto(skb, ETH_ZLEN))
return NETDEV_TX_OK;
@@ -2743,11 +2757,14 @@
e->skb = skb;
len = skb_headlen(skb);
map = pci_map_single(hw->pdev, skb->data, len, PCI_DMA_TODEVICE);
+ if (pci_dma_mapping_error(hw->pdev, map))
+ goto mapping_error;
+
dma_unmap_addr_set(e, mapaddr, map);
dma_unmap_len_set(e, maplen, len);
- td->dma_lo = map;
- td->dma_hi = map >> 32;
+ td->dma_lo = lower_32_bits(map);
+ td->dma_hi = upper_32_bits(map);
if (skb->ip_summed == CHECKSUM_PARTIAL) {
const int offset = skb_checksum_start_offset(skb);
@@ -2778,14 +2795,16 @@
map = skb_frag_dma_map(&hw->pdev->dev, frag, 0,
skb_frag_size(frag), DMA_TO_DEVICE);
+ if (dma_mapping_error(&hw->pdev->dev, map))
+ goto mapping_unwind;
e = e->next;
e->skb = skb;
tf = e->desc;
BUG_ON(tf->control & BMU_OWN);
- tf->dma_lo = map;
- tf->dma_hi = (u64) map >> 32;
+ tf->dma_lo = lower_32_bits(map);
+ tf->dma_hi = upper_32_bits(map);
dma_unmap_addr_set(e, mapaddr, map);
dma_unmap_len_set(e, maplen, skb_frag_size(frag));
@@ -2813,6 +2832,28 @@
}
return NETDEV_TX_OK;
+
+mapping_unwind:
+ /* unroll any pages that were already mapped. */
+ if (e != skge->tx_ring.to_use) {
+ struct skge_element *u;
+
+ for (u = skge->tx_ring.to_use->next; u != e; u = u->next)
+ pci_unmap_page(hw->pdev, dma_unmap_addr(u, mapaddr),
+ dma_unmap_len(u, maplen),
+ PCI_DMA_TODEVICE);
+ e = skge->tx_ring.to_use;
+ }
+ /* undo the mapping for the skb header */
+ pci_unmap_single(hw->pdev, dma_unmap_addr(e, mapaddr),
+ dma_unmap_len(e, maplen),
+ PCI_DMA_TODEVICE);
+mapping_error:
+ /* mapping error causes error message and packet to be discarded. */
+ if (net_ratelimit())
+ dev_warn(&hw->pdev->dev, "%s: tx mapping error\n", dev->name);
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
}
@@ -3060,13 +3101,17 @@
if (!nskb)
goto resubmit;
+ if (unlikely(skge_rx_setup(skge->hw->pdev, e, nskb, skge->rx_buf_size))) {
+ dev_kfree_skb(nskb);
+ goto resubmit;
+ }
+
pci_unmap_single(skge->hw->pdev,
dma_unmap_addr(e, mapaddr),
dma_unmap_len(e, maplen),
PCI_DMA_FROMDEVICE);
skb = e->skb;
prefetch(skb->data);
- skge_rx_setup(skge, e, nskb, skge->rx_buf_size);
}
skb_put(skb, len);