From 9495c282baf53ec7bfffcb9dd9f40cb10d4240e0 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Tue, 9 Mar 2010 17:42:17 -0800 Subject: [PATCH] Staging: hv: handle skb allocation failure 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 Cc: Hank Janssen Signed-off-by: Greg Kroah-Hartman --- drivers/staging/hv/netvsc_drv.c | 32 ++++++++++++-------------------- 1 file changed, 12 insertions(+), 20 deletions(-) diff --git a/drivers/staging/hv/netvsc_drv.c b/drivers/staging/hv/netvsc_drv.c index e87a7c2..51a56e2 100644 --- a/drivers/staging/hv/netvsc_drv.c +++ b/drivers/staging/hv/netvsc_drv.c @@ -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); - - switch (ret) { - case NET_RX_DROP: - net->stats.rx_dropped++; - break; - default: - net->stats.rx_packets++; - net->stats.rx_bytes += skb->len; - break; + netif_rx(skb); - } DPRINT_DBG(NETVSC_DRV, "# of recvs %lu total size %lu", net->stats.rx_packets, net->stats.rx_bytes); -- 2.7.4