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be2net: handle dma mapping errors in Tx path 

Signed-off-by: Sathya Perla <sathyap@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sathya Perla 2010-03-22 20:41:12 +00:00 committed by David S. Miller
parent 7316ae88c4
commit 7101e11121
1 changed files with 38 additions and 3 deletions
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41
drivers/net/benet/be_main.c
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@ -386,26 +386,48 @@ static void wrb_fill_hdr(struct be_eth_hdr_wrb *hdr, struct sk_buff *skb,
AMAP_SET_BITS(struct amap_eth_hdr_wrb, len, hdr, len); AMAP_SET_BITS(struct amap_eth_hdr_wrb, len, hdr, len);
} }
static void unmap_tx_frag(struct pci_dev *pdev, struct be_eth_wrb *wrb,
bool unmap_single)
{
dma_addr_t dma;
be_dws_le_to_cpu(wrb, sizeof(*wrb));
dma = (u64)wrb->frag_pa_hi << 32 | (u64)wrb->frag_pa_lo;
if (dma != 0) {
if (unmap_single)
pci_unmap_single(pdev, dma, wrb->frag_len,
PCI_DMA_TODEVICE);
else
pci_unmap_page(pdev, dma, wrb->frag_len,
PCI_DMA_TODEVICE);
}
}
static int make_tx_wrbs(struct be_adapter *adapter, static int make_tx_wrbs(struct be_adapter *adapter,
struct sk_buff *skb, u32 wrb_cnt, bool dummy_wrb) struct sk_buff *skb, u32 wrb_cnt, bool dummy_wrb)
{ {
u64 busaddr; dma_addr_t busaddr;
u32 i, copied = 0; int i, copied = 0;
struct pci_dev *pdev = adapter->pdev; struct pci_dev *pdev = adapter->pdev;
struct sk_buff *first_skb = skb; struct sk_buff *first_skb = skb;
struct be_queue_info *txq = &adapter->tx_obj.q; struct be_queue_info *txq = &adapter->tx_obj.q;
struct be_eth_wrb *wrb; struct be_eth_wrb *wrb;
struct be_eth_hdr_wrb *hdr; struct be_eth_hdr_wrb *hdr;
bool map_single = false;
u16 map_head;
hdr = queue_head_node(txq); hdr = queue_head_node(txq);
atomic_add(wrb_cnt, &txq->used);
queue_head_inc(txq); queue_head_inc(txq);
map_head = txq->head;
if (skb->len > skb->data_len) { if (skb->len > skb->data_len) {
int len = skb->len - skb->data_len; int len = skb->len - skb->data_len;
busaddr = pci_map_single(pdev, skb->data, len, busaddr = pci_map_single(pdev, skb->data, len,
PCI_DMA_TODEVICE); PCI_DMA_TODEVICE);
if (pci_dma_mapping_error(pdev, busaddr))
goto dma_err;
map_single = true;
wrb = queue_head_node(txq); wrb = queue_head_node(txq);
wrb_fill(wrb, busaddr, len); wrb_fill(wrb, busaddr, len);
be_dws_cpu_to_le(wrb, sizeof(*wrb)); be_dws_cpu_to_le(wrb, sizeof(*wrb));
@ -419,6 +441,8 @@ static int make_tx_wrbs(struct be_adapter *adapter,
busaddr = pci_map_page(pdev, frag->page, busaddr = pci_map_page(pdev, frag->page,
frag->page_offset, frag->page_offset,
frag->size, PCI_DMA_TODEVICE); frag->size, PCI_DMA_TODEVICE);
if (pci_dma_mapping_error(pdev, busaddr))
goto dma_err;
wrb = queue_head_node(txq); wrb = queue_head_node(txq);
wrb_fill(wrb, busaddr, frag->size); wrb_fill(wrb, busaddr, frag->size);
be_dws_cpu_to_le(wrb, sizeof(*wrb)); be_dws_cpu_to_le(wrb, sizeof(*wrb));
@ -438,6 +462,16 @@ static int make_tx_wrbs(struct be_adapter *adapter,
be_dws_cpu_to_le(hdr, sizeof(*hdr)); be_dws_cpu_to_le(hdr, sizeof(*hdr));
return copied; return copied;
dma_err:
txq->head = map_head;
while (copied) {
wrb = queue_head_node(txq);
unmap_tx_frag(pdev, wrb, map_single);
map_single = false;
copied -= wrb->frag_len;
queue_head_inc(txq);
}
return 0;
} }
static netdev_tx_t be_xmit(struct sk_buff *skb, static netdev_tx_t be_xmit(struct sk_buff *skb,
@ -462,6 +496,7 @@ static netdev_tx_t be_xmit(struct sk_buff *skb,
* *BEFORE* ringing the tx doorbell, so that we serialze the * *BEFORE* ringing the tx doorbell, so that we serialze the
* tx compls of the current transmit which'll wake up the queue * tx compls of the current transmit which'll wake up the queue
*/ */
atomic_add(wrb_cnt, &txq->used);
if ((BE_MAX_TX_FRAG_COUNT + atomic_read(&txq->used)) >= if ((BE_MAX_TX_FRAG_COUNT + atomic_read(&txq->used)) >=
txq->len) { txq->len) {
netif_stop_queue(netdev); netif_stop_queue(netdev);