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Commit 5734418d authored by Francois Romieu's avatar Francois Romieu Committed by Jeff Garzik
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[PATCH] 8139cp: SG support fixes 

  
  - 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.
parent fcec3456

drivers/net/8139cp.c

+13 −12
Original line number Diff line number Diff line
@@ -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);

				 	 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);

}