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tlan: manage rx allocation failure better

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Rx allocation failure at runtime is non-fatal. For normal Rx frame, it
just reuses the buffer, and during setup it just continues with a smaller
receive buffer pool.

Compile tested only.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Stephen Hemminger 2008-05-30 09:49:56 -07:00 committed by Jeff Garzik
parent 93e16847c9
commit 9ded65a1d7
1 changed files with 29 additions and 34 deletions
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61
drivers/net/tlan.c
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@ -1539,8 +1539,6 @@ static u32 TLan_HandleRxEOF( struct net_device *dev, u16 host_int )
TLanList *head_list;
struct sk_buff *skb;
TLanList *tail_list;
void *t;
u32 frameSize;
u16 tmpCStat;
dma_addr_t head_list_phys;
@ -1549,40 +1547,34 @@ static u32 TLan_HandleRxEOF( struct net_device *dev, u16 host_int )
head_list_phys = priv->rxListDMA + sizeof(TLanList) * priv->rxHead;
while (((tmpCStat = head_list->cStat) & TLAN_CSTAT_FRM_CMP) && (ack < 255)) {
frameSize = head_list->frameSize;
dma_addr_t frameDma = head_list->buffer[0].address;
u32 frameSize = head_list->frameSize;
ack++;
if (tmpCStat & TLAN_CSTAT_EOC)
eoc = 1;
if (bbuf) {
skb = dev_alloc_skb(frameSize + 7);
if (skb == NULL)
printk(KERN_INFO "TLAN: Couldn't allocate memory for received data.\n");
else {
skb = netdev_alloc_skb(dev, frameSize + 7);
if ( skb ) {
head_buffer = priv->rxBuffer + (priv->rxHead * TLAN_MAX_FRAME_SIZE);
skb_reserve(skb, 2);
t = (void *) skb_put(skb, frameSize);
pci_dma_sync_single_for_cpu(priv->pciDev,
frameDma, frameSize,
PCI_DMA_FROMDEVICE);
skb_copy_from_linear_data(skb, head_buffer, frameSize);
skb_put(skb, frameSize);
dev->stats.rx_bytes += frameSize;
dev->stats.rx_bytes += head_list->frameSize;
memcpy( t, head_buffer, frameSize );
skb->protocol = eth_type_trans( skb, dev );
netif_rx( skb );
}
} else {
struct sk_buff *new_skb;
/*
* I changed the algorithm here. What we now do
* is allocate the new frame. If this fails we
* simply recycle the frame.
*/
new_skb = dev_alloc_skb( TLAN_MAX_FRAME_SIZE + 7 );
if ( new_skb != NULL ) {
new_skb = netdev_alloc_skb(dev, TLAN_MAX_FRAME_SIZE + 7 );
if ( new_skb ) {
skb = TLan_GetSKB(head_list);
pci_unmap_single(priv->pciDev, head_list->buffer[0].address, TLAN_MAX_FRAME_SIZE, PCI_DMA_FROMDEVICE);
pci_unmap_single(priv->pciDev, frameDma, TLAN_MAX_FRAME_SIZE, PCI_DMA_FROMDEVICE);
skb_put( skb, frameSize );
dev->stats.rx_bytes += frameSize;
@ -1590,12 +1582,12 @@ static u32 TLan_HandleRxEOF( struct net_device *dev, u16 host_int )
skb->protocol = eth_type_trans( skb, dev );
netif_rx( skb );
skb_reserve( new_skb, 2 );
skb_reserve( new_skb, NET_IP_ALIGN );
head_list->buffer[0].address = pci_map_single(priv->pciDev, new_skb->data, TLAN_MAX_FRAME_SIZE, PCI_DMA_FROMDEVICE);
TLan_StoreSKB(head_list, new_skb);
} else
printk(KERN_WARNING "TLAN: Couldn't allocate memory for received data.\n" );
}
}
head_list->forward = 0;
@ -1994,25 +1986,28 @@ static void TLan_ResetLists( struct net_device *dev )
if ( bbuf ) {
list->buffer[0].address = priv->rxBufferDMA + ( i * TLAN_MAX_FRAME_SIZE );
} else {
skb = dev_alloc_skb( TLAN_MAX_FRAME_SIZE + 7 );
if ( skb == NULL ) {
skb = netdev_alloc_skb(dev, TLAN_MAX_FRAME_SIZE + 7 );
if ( !skb ) {
printk( "TLAN: Couldn't allocate memory for received data.\n" );
/* If this ever happened it would be a problem */
} else {
skb->dev = dev;
skb_reserve( skb, 2 );
break;
}
skb_reserve( skb, NET_IP_ALIGN );
list->buffer[0].address = pci_map_single(priv->pciDev, t, TLAN_MAX_FRAME_SIZE, PCI_DMA_FROMDEVICE);
TLan_StoreSKB(list, skb);
}
list->buffer[1].count = 0;
list->buffer[1].address = 0;
if ( i < TLAN_NUM_RX_LISTS - 1 )
list->forward = list_phys + sizeof(TLanList);
else
list->forward = 0;
}
/* in case ran out of memory early, clear bits */
while (i < TLAN_NUM_RX_LISTS) {
TLan_StoreSKB(priv->rxList + i, NULL);
++i;
}
list->forward = 0;
} /* TLan_ResetLists */