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Staging: hv: handle skb allocation failure

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Some fixes to receive handling:
  * Dieing with assertion failure when running out of memory is not ok
  * Use newer alloc function to get aligned skb
  * Dropped statistic is supposed to be incremented only by
    driver it was responsible for the drop.

Compile tested only.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Cc: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Stephen Hemminger 2010-03-09 17:42:17 -08:00 committed by Greg Kroah-Hartman
parent b852fdcefc
commit 9495c282ba
1 changed files with 12 additions and 20 deletions
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32
drivers/staging/hv/netvsc_drv.c
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@ -294,7 +294,6 @@ static int netvsc_recv_callback(struct hv_device *device_obj,
struct net_device_context *net_device_ctx;
struct sk_buff *skb;
void *data;
int ret;
int i;
unsigned long flags;
@ -308,12 +307,12 @@ static int netvsc_recv_callback(struct hv_device *device_obj,
net_device_ctx = netdev_priv(net);
/* Allocate a skb - TODO preallocate this */
/* Pad 2-bytes to align IP header to 16 bytes */
skb = dev_alloc_skb(packet->TotalDataBufferLength + 2);
ASSERT(skb);
skb_reserve(skb, 2);
skb->dev = net;
/* Allocate a skb - TODO direct I/O to pages? */
skb = netdev_alloc_skb_ip_align(net, packet->TotalDataBufferLength);
if (unlikely(!skb)) {
++net->stats.rx_dropped;
return 0;
}
/* for kmap_atomic */
local_irq_save(flags);
@ -338,25 +337,18 @@ static int netvsc_recv_callback(struct hv_device *device_obj,
local_irq_restore(flags);
skb->protocol = eth_type_trans(skb, net);
skb->ip_summed = CHECKSUM_NONE;
net->stats.rx_packets++;
net->stats.rx_bytes += skb->len;
/*
* Pass the skb back up. Network stack will deallocate the skb when it
* is done
* is done.
* TODO - use NAPI?
*/
ret = netif_rx(skb);
netif_rx(skb);
switch (ret) {
case NET_RX_DROP:
net->stats.rx_dropped++;
break;
default:
net->stats.rx_packets++;
net->stats.rx_bytes += skb->len;
break;
}
DPRINT_DBG(NETVSC_DRV, "# of recvs %lu total size %lu",
net->stats.rx_packets, net->stats.rx_bytes);