netxen: fix lro buffer allocation

Alloc 12k skbuffs so that firmware can aggregate more
packets into one buffer. This doesn't raise memory
consumption since 9k skbs use 16k slab cache anyway.
Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/netxen/netxen_nic.h

@@ -149,6 +149,7 @@
 #define NX_P2_RX_JUMBO_BUF_MAX_LEN     (NX_MAX_ETHERHDR + P2_MAX_MTU)
 #define NX_P3_RX_JUMBO_BUF_MAX_LEN     (NX_MAX_ETHERHDR + P3_MAX_MTU)
 #define NX_CT_DEFAULT_RX_BUF_LEN	2048
+#define NX_LRO_BUFFER_EXTRA		2048
 
 #define NX_RX_LRO_BUFFER_LENGTH		(8060)
 

drivers/net/netxen/netxen_nic_init.c

@@ -265,6 +265,10 @@ int netxen_alloc_sw_resources(struct netxen_adapter *adapter)
 			else
 				rds_ring->dma_size =
 					NX_P2_RX_JUMBO_BUF_MAX_LEN;
+
+			if (adapter->capabilities & NX_CAP0_HW_LRO)
+				rds_ring->dma_size += NX_LRO_BUFFER_EXTRA;
+
 			rds_ring->skb_size =
 				rds_ring->dma_size + NET_IP_ALIGN;
 			break;
@@ -1217,6 +1221,7 @@ netxen_process_rcv(struct netxen_adapter *adapter,
 	if (pkt_offset)
 		skb_pull(skb, pkt_offset);
 
+	skb->truesize = skb->len + sizeof(struct sk_buff);
 	skb->protocol = eth_type_trans(skb, netdev);
 
 	napi_gro_receive(&sds_ring->napi, skb);
@@ -1278,8 +1283,7 @@ netxen_process_lro(struct netxen_adapter *adapter,
 
 	skb_put(skb, lro_length + data_offset);
 
-	skb->truesize = (skb->len + sizeof(struct sk_buff) +
-			((unsigned long)skb->data - (unsigned long)skb->head));
+	skb->truesize = skb->len + sizeof(struct sk_buff) + skb_headroom(skb);
 
 	skb_pull(skb, l2_hdr_offset);
 	skb->protocol = eth_type_trans(skb, netdev);