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forcedeth: fix dma api mismatches
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forcedeth doesnt use properly dma api in its tx completion path
and in nv_loopback_test()

pci_map_single() should be paired with pci_unmap_single()
pci_map_page() should be paired with pci_unmap_page()

forcedeth xmit path uses pci_map_single() & pci_map_page(),
but tx completion path only uses pci_unmap_single()

nv_loopback_test() uses pci_map_single() & pci_unmap_page()

Add a dma_single field in struct nv_skb_map, and
define a helper function nv_unmap_txskb

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Ayaz Abdulla <aabdulla@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Eric Dumazet authored and David S. Miller committed Jun 18, 2009
1 parent 81e2a3d commit 73a3707
Showing 1 changed file with 27 additions and 19 deletions.
46 changes: 27 additions & 19 deletions drivers/net/forcedeth.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -719,7 +719,8 @@ static const struct register_test nv_registers_test[] = {
struct nv_skb_map {
struct sk_buff *skb;
dma_addr_t dma;
unsigned int dma_len;
unsigned int dma_len:31;
unsigned int dma_single:1;
struct ring_desc_ex *first_tx_desc;
struct nv_skb_map *next_tx_ctx;
};
Expand Down Expand Up @@ -1912,6 +1913,7 @@ static void nv_init_tx(struct net_device *dev)
np->tx_skb[i].skb = NULL;
np->tx_skb[i].dma = 0;
np->tx_skb[i].dma_len = 0;
np->tx_skb[i].dma_single = 0;
np->tx_skb[i].first_tx_desc = NULL;
np->tx_skb[i].next_tx_ctx = NULL;
}
Expand All @@ -1930,23 +1932,30 @@ static int nv_init_ring(struct net_device *dev)
return nv_alloc_rx_optimized(dev);
}

static int nv_release_txskb(struct net_device *dev, struct nv_skb_map* tx_skb)
static void nv_unmap_txskb(struct fe_priv *np, struct nv_skb_map *tx_skb)
{
struct fe_priv *np = netdev_priv(dev);

if (tx_skb->dma) {
pci_unmap_page(np->pci_dev, tx_skb->dma,
tx_skb->dma_len,
PCI_DMA_TODEVICE);
if (tx_skb->dma_single)
pci_unmap_single(np->pci_dev, tx_skb->dma,
tx_skb->dma_len,
PCI_DMA_TODEVICE);
else
pci_unmap_page(np->pci_dev, tx_skb->dma,
tx_skb->dma_len,
PCI_DMA_TODEVICE);
tx_skb->dma = 0;
}
}

static int nv_release_txskb(struct fe_priv *np, struct nv_skb_map *tx_skb)
{
nv_unmap_txskb(np, tx_skb);
if (tx_skb->skb) {
dev_kfree_skb_any(tx_skb->skb);
tx_skb->skb = NULL;
return 1;
} else {
return 0;
}
return 0;
}

static void nv_drain_tx(struct net_device *dev)
Expand All @@ -1964,10 +1973,11 @@ static void nv_drain_tx(struct net_device *dev)
np->tx_ring.ex[i].bufhigh = 0;
np->tx_ring.ex[i].buflow = 0;
}
if (nv_release_txskb(dev, &np->tx_skb[i]))
if (nv_release_txskb(np, &np->tx_skb[i]))
dev->stats.tx_dropped++;
np->tx_skb[i].dma = 0;
np->tx_skb[i].dma_len = 0;
np->tx_skb[i].dma_single = 0;
np->tx_skb[i].first_tx_desc = NULL;
np->tx_skb[i].next_tx_ctx = NULL;
}
Expand Down Expand Up @@ -2171,6 +2181,7 @@ static int nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
np->put_tx_ctx->dma = pci_map_single(np->pci_dev, skb->data + offset, bcnt,
PCI_DMA_TODEVICE);
np->put_tx_ctx->dma_len = bcnt;
np->put_tx_ctx->dma_single = 1;
put_tx->buf = cpu_to_le32(np->put_tx_ctx->dma);
put_tx->flaglen = cpu_to_le32((bcnt-1) | tx_flags);

Expand All @@ -2196,6 +2207,7 @@ static int nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
np->put_tx_ctx->dma = pci_map_page(np->pci_dev, frag->page, frag->page_offset+offset, bcnt,
PCI_DMA_TODEVICE);
np->put_tx_ctx->dma_len = bcnt;
np->put_tx_ctx->dma_single = 0;
put_tx->buf = cpu_to_le32(np->put_tx_ctx->dma);
put_tx->flaglen = cpu_to_le32((bcnt-1) | tx_flags);

Expand Down Expand Up @@ -2291,6 +2303,7 @@ static int nv_start_xmit_optimized(struct sk_buff *skb, struct net_device *dev)
np->put_tx_ctx->dma = pci_map_single(np->pci_dev, skb->data + offset, bcnt,
PCI_DMA_TODEVICE);
np->put_tx_ctx->dma_len = bcnt;
np->put_tx_ctx->dma_single = 1;
put_tx->bufhigh = cpu_to_le32(dma_high(np->put_tx_ctx->dma));
put_tx->buflow = cpu_to_le32(dma_low(np->put_tx_ctx->dma));
put_tx->flaglen = cpu_to_le32((bcnt-1) | tx_flags);
Expand All @@ -2317,6 +2330,7 @@ static int nv_start_xmit_optimized(struct sk_buff *skb, struct net_device *dev)
np->put_tx_ctx->dma = pci_map_page(np->pci_dev, frag->page, frag->page_offset+offset, bcnt,
PCI_DMA_TODEVICE);
np->put_tx_ctx->dma_len = bcnt;
np->put_tx_ctx->dma_single = 0;
put_tx->bufhigh = cpu_to_le32(dma_high(np->put_tx_ctx->dma));
put_tx->buflow = cpu_to_le32(dma_low(np->put_tx_ctx->dma));
put_tx->flaglen = cpu_to_le32((bcnt-1) | tx_flags);
Expand Down Expand Up @@ -2434,10 +2448,7 @@ static int nv_tx_done(struct net_device *dev, int limit)
dprintk(KERN_DEBUG "%s: nv_tx_done: flags 0x%x.\n",
dev->name, flags);

pci_unmap_page(np->pci_dev, np->get_tx_ctx->dma,
np->get_tx_ctx->dma_len,
PCI_DMA_TODEVICE);
np->get_tx_ctx->dma = 0;
nv_unmap_txskb(np, np->get_tx_ctx);

if (np->desc_ver == DESC_VER_1) {
if (flags & NV_TX_LASTPACKET) {
Expand Down Expand Up @@ -2502,10 +2513,7 @@ static int nv_tx_done_optimized(struct net_device *dev, int limit)
dprintk(KERN_DEBUG "%s: nv_tx_done_optimized: flags 0x%x.\n",
dev->name, flags);

pci_unmap_page(np->pci_dev, np->get_tx_ctx->dma,
np->get_tx_ctx->dma_len,
PCI_DMA_TODEVICE);
np->get_tx_ctx->dma = 0;
nv_unmap_txskb(np, np->get_tx_ctx);

if (flags & NV_TX2_LASTPACKET) {
if (!(flags & NV_TX2_ERROR))
Expand Down Expand Up @@ -5091,7 +5099,7 @@ static int nv_loopback_test(struct net_device *dev)
dprintk(KERN_DEBUG "%s: loopback - did not receive test packet\n", dev->name);
}

pci_unmap_page(np->pci_dev, test_dma_addr,
pci_unmap_single(np->pci_dev, test_dma_addr,
(skb_end_pointer(tx_skb) - tx_skb->data),
PCI_DMA_TODEVICE);
dev_kfree_skb_any(tx_skb);
Expand Down

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