tlan: manage rx allocation failure better
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>
diff --git a/drivers/net/tlan.c b/drivers/net/tlan.c
index aee2a45..afc83100 100644
--- a/drivers/net/tlan.c
+++ b/drivers/net/tlan.c
@@ -1539,8 +1539,6 @@
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 @@
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 @@
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 @@
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;
+ list->forward = list_phys + sizeof(TLanList);
}
+ /* 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 */