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netxen: handle dma mapping failures

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o Bail out if pci_map_single() fails while replenishing rx ring.
o Drop packet if pci_map_{single,page}() fail in tx.

Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dhananjay Phadke
2009-01-14 20:50:00 -08:00
committed by David S. Miller
parent 03e678ee96
commit 6f70340698
3 changed files with 67 additions and 40 deletions
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68
drivers/net/netxen/netxen_nic_init.c
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@@ -308,7 +308,6 @@ int netxen_alloc_sw_resources(struct netxen_adapter *adapter)
}
memset(rds_ring->rx_buf_arr, 0, RCV_BUFFSIZE);
INIT_LIST_HEAD(&rds_ring->free_list);
rds_ring->begin_alloc = 0;
/*
* Now go through all of them, set reference handles
* and put them in the queues.
@@ -1435,7 +1434,6 @@ void netxen_post_rx_buffers(struct netxen_adapter *adapter, u32 ctx, u32 ringid)
struct rcv_desc *pdesc;
struct netxen_rx_buffer *buffer;
int count = 0;
int index = 0;
netxen_ctx_msg msg = 0;
dma_addr_t dma;
struct list_head *head;
@@ -1443,7 +1441,6 @@ void netxen_post_rx_buffers(struct netxen_adapter *adapter, u32 ctx, u32 ringid)
rds_ring = &recv_ctx->rds_rings[ringid];
producer = rds_ring->producer;
index = rds_ring->begin_alloc;
head = &rds_ring->free_list;
/* We can start writing rx descriptors into the phantom memory. */
@@ -1451,39 +1448,37 @@ void netxen_post_rx_buffers(struct netxen_adapter *adapter, u32 ctx, u32 ringid)
skb = dev_alloc_skb(rds_ring->skb_size);
if (unlikely(!skb)) {
rds_ring->begin_alloc = index;
break;
}
if (!adapter->ahw.cut_through)
skb_reserve(skb, 2);
dma = pci_map_single(pdev, skb->data,
rds_ring->dma_size, PCI_DMA_FROMDEVICE);
if (pci_dma_mapping_error(pdev, dma)) {
dev_kfree_skb_any(skb);
break;
}
count++;
buffer = list_entry(head->next, struct netxen_rx_buffer, list);
list_del(&buffer->list);
count++; /* now there should be no failure */
pdesc = &rds_ring->desc_head[producer];
if (!adapter->ahw.cut_through)
skb_reserve(skb, 2);
/* This will be setup when we receive the
* buffer after it has been filled FSL TBD TBD
* skb->dev = netdev;
*/
dma = pci_map_single(pdev, skb->data, rds_ring->dma_size,
PCI_DMA_FROMDEVICE);
pdesc->addr_buffer = cpu_to_le64(dma);
buffer->skb = skb;
buffer->state = NETXEN_BUFFER_BUSY;
buffer->dma = dma;
/* make a rcv descriptor */
pdesc = &rds_ring->desc_head[producer];
pdesc->addr_buffer = cpu_to_le64(dma);
pdesc->reference_handle = cpu_to_le16(buffer->ref_handle);
pdesc->buffer_length = cpu_to_le32(rds_ring->dma_size);
DPRINTK(INFO, "done writing descripter\n");
producer =
get_next_index(producer, rds_ring->max_rx_desc_count);
index = get_next_index(index, rds_ring->max_rx_desc_count);
producer = get_next_index(producer, rds_ring->max_rx_desc_count);
}
/* if we did allocate buffers, then write the count to Phantom */
if (count) {
rds_ring->begin_alloc = index;
rds_ring->producer = producer;
/* Window = 1 */
adapter->pci_write_normalize(adapter,
@@ -1522,49 +1517,50 @@ static void netxen_post_rx_buffers_nodb(struct netxen_adapter *adapter,
struct rcv_desc *pdesc;
struct netxen_rx_buffer *buffer;
int count = 0;
int index = 0;
struct list_head *head;
dma_addr_t dma;
rds_ring = &recv_ctx->rds_rings[ringid];
producer = rds_ring->producer;
index = rds_ring->begin_alloc;
head = &rds_ring->free_list;
/* We can start writing rx descriptors into the phantom memory. */
while (!list_empty(head)) {
skb = dev_alloc_skb(rds_ring->skb_size);
if (unlikely(!skb)) {
rds_ring->begin_alloc = index;
break;
}
if (!adapter->ahw.cut_through)
skb_reserve(skb, 2);
dma = pci_map_single(pdev, skb->data,
rds_ring->dma_size, PCI_DMA_FROMDEVICE);
if (pci_dma_mapping_error(pdev, dma)) {
dev_kfree_skb_any(skb);
break;
}
count++;
buffer = list_entry(head->next, struct netxen_rx_buffer, list);
list_del(&buffer->list);
count++; /* now there should be no failure */
pdesc = &rds_ring->desc_head[producer];
if (!adapter->ahw.cut_through)
skb_reserve(skb, 2);
buffer->skb = skb;
buffer->state = NETXEN_BUFFER_BUSY;
buffer->dma = pci_map_single(pdev, skb->data,
rds_ring->dma_size,
PCI_DMA_FROMDEVICE);
buffer->dma = dma;
/* make a rcv descriptor */
pdesc = &rds_ring->desc_head[producer];
pdesc->reference_handle = cpu_to_le16(buffer->ref_handle);
pdesc->buffer_length = cpu_to_le32(rds_ring->dma_size);
pdesc->addr_buffer = cpu_to_le64(buffer->dma);
producer =
get_next_index(producer, rds_ring->max_rx_desc_count);
index = get_next_index(index, rds_ring->max_rx_desc_count);
buffer = &rds_ring->rx_buf_arr[index];
producer = get_next_index(producer, rds_ring->max_rx_desc_count);
}
/* if we did allocate buffers, then write the count to Phantom */
if (count) {
rds_ring->begin_alloc = index;
rds_ring->producer = producer;
/* Window = 1 */
adapter->pci_write_normalize(adapter,