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[PATCH] 8139cp: SG support fixes

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- suspicious length in pci_unmap_single;
  - wait for the last frag before freeing the relevant skb;
  - no need to crash when facing some unexpected csum combination.
This commit is contained in:
Francois Romieu 2005-05-12 19:31:31 -04:00 committed by Jeff Garzik
parent fcec345658
commit 5734418d4f
1 changed files with 13 additions and 12 deletions
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25
drivers/net/8139cp.c
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@ -315,7 +315,7 @@ struct cp_desc {
struct ring_info {
struct sk_buff *skb;
dma_addr_t mapping;
unsigned frag;
u32 len;
};
struct cp_dma_stats {
@ -710,7 +710,7 @@ static void cp_tx (struct cp_private *cp)
BUG();
pci_unmap_single(cp->pdev, cp->tx_skb[tx_tail].mapping,
skb->len, PCI_DMA_TODEVICE);
cp->tx_skb[tx_tail].len, PCI_DMA_TODEVICE);
if (status & LastFrag) {
if (status & (TxError | TxFIFOUnder)) {
@ -801,7 +801,7 @@ static int cp_start_xmit (struct sk_buff *skb, struct net_device *dev)
else if (ip->protocol == IPPROTO_UDP)
flags |= IPCS | UDPCS;
else
BUG();
WARN_ON(1); /* we need a WARN() */
}
txd->opts1 = cpu_to_le32(flags);
@ -809,7 +809,7 @@ static int cp_start_xmit (struct sk_buff *skb, struct net_device *dev)
cp->tx_skb[entry].skb = skb;
cp->tx_skb[entry].mapping = mapping;
cp->tx_skb[entry].frag = 0;
cp->tx_skb[entry].len = len;
entry = NEXT_TX(entry);
} else {
struct cp_desc *txd;
@ -827,7 +827,7 @@ static int cp_start_xmit (struct sk_buff *skb, struct net_device *dev)
first_len, PCI_DMA_TODEVICE);
cp->tx_skb[entry].skb = skb;
cp->tx_skb[entry].mapping = first_mapping;
cp->tx_skb[entry].frag = 1;
cp->tx_skb[entry].len = first_len;
entry = NEXT_TX(entry);
for (frag = 0; frag < skb_shinfo(skb)->nr_frags; frag++) {
@ -870,7 +870,7 @@ static int cp_start_xmit (struct sk_buff *skb, struct net_device *dev)
cp->tx_skb[entry].skb = skb;
cp->tx_skb[entry].mapping = mapping;
cp->tx_skb[entry].frag = frag + 2;
cp->tx_skb[entry].len = len;
entry = NEXT_TX(entry);
}
@ -1084,7 +1084,6 @@ static int cp_refill_rx (struct cp_private *cp)
cp->rx_skb[i].mapping = pci_map_single(cp->pdev,
skb->tail, cp->rx_buf_sz, PCI_DMA_FROMDEVICE);
cp->rx_skb[i].skb = skb;
cp->rx_skb[i].frag = 0;
cp->rx_ring[i].opts2 = 0;
cp->rx_ring[i].addr = cpu_to_le64(cp->rx_skb[i].mapping);
@ -1136,9 +1135,6 @@ static void cp_clean_rings (struct cp_private *cp)
{
unsigned i;
memset(cp->rx_ring, 0, sizeof(struct cp_desc) * CP_RX_RING_SIZE);
memset(cp->tx_ring, 0, sizeof(struct cp_desc) * CP_TX_RING_SIZE);
for (i = 0; i < CP_RX_RING_SIZE; i++) {
if (cp->rx_skb[i].skb) {
pci_unmap_single(cp->pdev, cp->rx_skb[i].mapping,
@ -1150,13 +1146,18 @@ static void cp_clean_rings (struct cp_private *cp)
for (i = 0; i < CP_TX_RING_SIZE; i++) {
if (cp->tx_skb[i].skb) {
struct sk_buff *skb = cp->tx_skb[i].skb;
pci_unmap_single(cp->pdev, cp->tx_skb[i].mapping,
skb->len, PCI_DMA_TODEVICE);
dev_kfree_skb(skb);
cp->tx_skb[i].len, PCI_DMA_TODEVICE);
if (le32_to_cpu(cp->tx_ring[i].opts1) & LastFrag)
dev_kfree_skb(skb);
cp->net_stats.tx_dropped++;
}
}
memset(cp->rx_ring, 0, sizeof(struct cp_desc) * CP_RX_RING_SIZE);
memset(cp->tx_ring, 0, sizeof(struct cp_desc) * CP_TX_RING_SIZE);
memset(&cp->rx_skb, 0, sizeof(struct ring_info) * CP_RX_RING_SIZE);
memset(&cp->tx_skb, 0, sizeof(struct ring_info) * CP_TX_RING_SIZE);
}