e1000 net drvr updates 8/13:

Minor receive cleanup, queue empty buffers to the hardware in 
groups of 16 to reduce unneeded fetches and improve PCI 
efficiency.

drivers/net/e1000/e1000.h

@@ -141,6 +141,8 @@ struct e1000_adapter;
 
 /* How many Tx Descriptors do we need to call netif_wake_queue ? */
 #define E1000_TX_QUEUE_WAKE	16
+/* How many Rx Buffers do we bundle into one write to the hardware ? */
+#define E1000_RX_BUFFER_WRITE	16
 
 #define E1000_JUMBO_PBA      0x00000028
 #define E1000_DEFAULT_PBA    0x00000030
@@ -201,7 +203,6 @@ struct e1000_adapter {
 	uint16_t link_duplex;
 	spinlock_t stats_lock;
 	atomic_t irq_sem;
-	boolean_t rx_csum;
 
 	/* TX */
 	struct e1000_desc_ring tx_ring;
@@ -215,6 +216,7 @@ struct e1000_adapter {
 	uint64_t hw_csum_err;
 	uint64_t hw_csum_good;
 	uint32_t rx_int_delay;
+	boolean_t rx_csum;
 
 	/* OS defined structs */
 	struct net_device *netdev;

drivers/net/e1000/e1000_main.c

@@ -834,18 +834,25 @@ e1000_setup_rctl(struct e1000_adapter *adapter)
 {
 	uint32_t rctl;
 
-	/* Setup the Receive Control Register */
-	rctl = E1000_RCTL_EN | E1000_RCTL_BAM |
+	rctl = E1000_READ_REG(&adapter->hw, RCTL);
+
+	rctl &= ~(3 << E1000_RCTL_MO_SHIFT);
+
+	rctl |= E1000_RCTL_EN | E1000_RCTL_BAM |
 	        E1000_RCTL_LBM_NO | E1000_RCTL_RDMTS_HALF |
 	        (adapter->hw.mc_filter_type << E1000_RCTL_MO_SHIFT);
 
 	if(adapter->hw.tbi_compatibility_on == 1)
 		rctl |= E1000_RCTL_SBP;
+	else
+		rctl &= ~E1000_RCTL_SBP;
 
+	rctl &= ~(E1000_RCTL_SZ_4096);
 	switch (adapter->rx_buffer_len) {
 	case E1000_RXBUFFER_2048:
 	default:
 		rctl |= E1000_RCTL_SZ_2048;
+		rctl &= ~(E1000_RCTL_BSEX | E1000_RCTL_LPE);
 		break;
 	case E1000_RXBUFFER_4096:
 		rctl |= E1000_RCTL_SZ_4096 | E1000_RCTL_BSEX | E1000_RCTL_LPE;
@@ -1961,7 +1968,7 @@ e1000_alloc_rx_buffers(struct e1000_adapter *adapter)
 
 		rx_desc->buffer_addr = cpu_to_le64(rx_ring->buffer_info[i].dma);
 
-		/* move tail */
+		if(!(i % E1000_RX_BUFFER_WRITE))
 			E1000_WRITE_REG(&adapter->hw, RDT, i);
 
 		i = (i + 1) % rx_ring->count;