diff --git a/drivers/net/netxen/netxen_nic.h b/drivers/net/netxen/netxen_nic.h
index 2bc5eaae141f..876cd0635f2e 100644
--- a/drivers/net/netxen/netxen_nic.h
+++ b/drivers/net/netxen/netxen_nic.h
@@ -942,6 +942,7 @@ struct netxen_adapter {
 	struct pci_dev *ctx_desc_pdev;
 	dma_addr_t ctx_desc_phys_addr;
 	int intr_scheme;
+	int msi_mode;
 	int (*enable_phy_interrupts) (struct netxen_adapter *);
 	int (*disable_phy_interrupts) (struct netxen_adapter *);
 	void (*handle_phy_intr) (struct netxen_adapter *);
diff --git a/drivers/net/netxen/netxen_nic_hdr.h b/drivers/net/netxen/netxen_nic_hdr.h
index d72f8f8fcb50..160f605e58db 100644
--- a/drivers/net/netxen/netxen_nic_hdr.h
+++ b/drivers/net/netxen/netxen_nic_hdr.h
@@ -456,6 +456,12 @@ enum {
 #define ISR_INT_MASK_SLOW	(NETXEN_PCIX_PS_REG(PCIX_INT_MASK))
 #define ISR_INT_TARGET_STATUS	(NETXEN_PCIX_PS_REG(PCIX_TARGET_STATUS))
 #define ISR_INT_TARGET_MASK	(NETXEN_PCIX_PS_REG(PCIX_TARGET_MASK))
+#define ISR_INT_TARGET_STATUS_F1   (NETXEN_PCIX_PS_REG(PCIX_TARGET_STATUS_F1))
+#define ISR_INT_TARGET_MASK_F1     (NETXEN_PCIX_PS_REG(PCIX_TARGET_MASK_F1))
+#define ISR_INT_TARGET_STATUS_F2   (NETXEN_PCIX_PS_REG(PCIX_TARGET_STATUS_F2))
+#define ISR_INT_TARGET_MASK_F2     (NETXEN_PCIX_PS_REG(PCIX_TARGET_MASK_F2))
+#define ISR_INT_TARGET_STATUS_F3   (NETXEN_PCIX_PS_REG(PCIX_TARGET_STATUS_F3))
+#define ISR_INT_TARGET_MASK_F3     (NETXEN_PCIX_PS_REG(PCIX_TARGET_MASK_F3))
 
 #define NETXEN_PCI_MAPSIZE	128
 #define NETXEN_PCI_DDR_NET	(0x00000000UL)
@@ -662,6 +668,12 @@ enum {
 
 #define PCIX_TARGET_STATUS	(0x10118)
 #define PCIX_TARGET_MASK	(0x10128)
+#define PCIX_TARGET_STATUS_F1 (0x10160)
+#define PCIX_TARGET_MASK_F1   (0x10170)
+#define PCIX_TARGET_STATUS_F2 (0x10164)
+#define PCIX_TARGET_MASK_F2   (0x10174)
+#define PCIX_TARGET_STATUS_F3 (0x10168)
+#define PCIX_TARGET_MASK_F3   (0x10178)
 
 #define PCIX_MSI_F0		(0x13000)
 #define PCIX_MSI_F1		(0x13004)
diff --git a/drivers/net/netxen/netxen_nic_hw.c b/drivers/net/netxen/netxen_nic_hw.c
index 01355701bf8e..05748ca6f216 100644
--- a/drivers/net/netxen/netxen_nic_hw.c
+++ b/drivers/net/netxen/netxen_nic_hw.c
@@ -398,6 +398,8 @@ int netxen_nic_hw_resources(struct netxen_adapter *adapter)
 		NETXEN_CRB_NORMALIZE(adapter, CRB_NIC_CAPABILITIES_FW));
 	printk(KERN_NOTICE "%s: FW capabilities:0x%x\n", netxen_nic_driver_name,
 			adapter->intr_scheme);
+	adapter->msi_mode = readl(
+		NETXEN_CRB_NORMALIZE(adapter, CRB_NIC_MSI_MODE_FW));
 	DPRINTK(INFO, "Receive Peg ready too. starting stuff\n");
 
 	addr = netxen_alloc(adapter->ahw.pdev,
diff --git a/drivers/net/netxen/netxen_nic_init.c b/drivers/net/netxen/netxen_nic_init.c
index 9e38bcb3fba9..43eb1f65152d 100644
--- a/drivers/net/netxen/netxen_nic_init.c
+++ b/drivers/net/netxen/netxen_nic_init.c
@@ -145,6 +145,8 @@ int netxen_init_firmware(struct netxen_adapter *adapter)
 	/* Window 1 call */
 	writel(INTR_SCHEME_PERPORT,
 	       NETXEN_CRB_NORMALIZE(adapter, CRB_NIC_CAPABILITIES_HOST));
+	writel(MSI_MODE_MULTIFUNC,
+	       NETXEN_CRB_NORMALIZE(adapter, CRB_NIC_MSI_MODE_HOST));
 	writel(MPORT_MULTI_FUNCTION_MODE,
 	       NETXEN_CRB_NORMALIZE(adapter, CRB_MPORT_MODE));
 	writel(PHAN_INITIALIZE_ACK,
diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index 9737eae5ef11..cd665da85c7f 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -149,33 +149,31 @@ static void netxen_nic_update_cmd_consumer(struct netxen_adapter *adapter,
 
 #define	ADAPTER_LIST_SIZE 12
 
+static uint32_t msi_tgt_status[4] = {
+	ISR_INT_TARGET_STATUS, ISR_INT_TARGET_STATUS_F1,
+	ISR_INT_TARGET_STATUS_F2, ISR_INT_TARGET_STATUS_F3
+};
+
+static uint32_t sw_int_mask[4] = {
+	CRB_SW_INT_MASK_0, CRB_SW_INT_MASK_1,
+	CRB_SW_INT_MASK_2, CRB_SW_INT_MASK_3
+};
+
 static void netxen_nic_disable_int(struct netxen_adapter *adapter)
 {
-	uint32_t	mask = 0x7ff;
+	u32 mask = 0x7ff;
 	int retries = 32;
+	int port = adapter->portnum;
+	int pci_fn = adapter->ahw.pci_func;
 
-	DPRINTK(1, INFO, "Entered ISR Disable \n");
-
-	switch (adapter->portnum) {
-	case 0:
-		writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_0));
-		break;
-	case 1:
-		writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_1));
-		break;
-	case 2:
-		writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_2));
-		break;
-	case 3:
-		writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_3));
-		break;
+	if (adapter->msi_mode != MSI_MODE_MULTIFUNC) {
+		writel(0x0, NETXEN_CRB_NORMALIZE(adapter, sw_int_mask[port]));
 	}
 
 	if (adapter->intr_scheme != -1 &&
 	    adapter->intr_scheme != INTR_SCHEME_PERPORT)
 		writel(mask,PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_MASK));
 
-	/* Window = 0 or 1 */
 	if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
 		do {
 			writel(0xffffffff,
@@ -190,14 +188,18 @@ static void netxen_nic_disable_int(struct netxen_adapter *adapter)
 			printk(KERN_NOTICE "%s: Failed to disable interrupt completely\n",
 					netxen_nic_driver_name);
 		}
+	} else {
+		if (adapter->msi_mode == MSI_MODE_MULTIFUNC) {
+			writel(0xffffffff, PCI_OFFSET_SECOND_RANGE(adapter,
+						msi_tgt_status[pci_fn]));
+		}
 	}
-
-	DPRINTK(1, INFO, "Done with Disable Int\n");
 }
 
 static void netxen_nic_enable_int(struct netxen_adapter *adapter)
 {
 	u32 mask;
+	int port = adapter->portnum;
 
 	DPRINTK(1, INFO, "Entered ISR Enable \n");
 
@@ -218,20 +220,7 @@ static void netxen_nic_enable_int(struct netxen_adapter *adapter)
 		writel(mask, PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_MASK));
 	}
 
-	switch (adapter->portnum) {
-	case 0:
-		writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_0));
-		break;
-	case 1:
-		writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_1));
-		break;
-	case 2:
-		writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_2));
-		break;
-	case 3:
-		writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_3));
-		break;
-	}
+	writel(0x1, NETXEN_CRB_NORMALIZE(adapter, sw_int_mask[port]));
 
 	if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
 		mask = 0xbff;
@@ -401,6 +390,7 @@ netxen_nic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	/* this will be read from FW later */
 	adapter->intr_scheme = -1;
+	adapter->msi_mode = -1;
 
 	/* This will be reset for mezz cards  */
 	adapter->portnum = pci_func_id;
diff --git a/drivers/net/netxen/netxen_nic_phan_reg.h b/drivers/net/netxen/netxen_nic_phan_reg.h
index ffa3b7215ce8..a566b50f36f5 100644
--- a/drivers/net/netxen/netxen_nic_phan_reg.h
+++ b/drivers/net/netxen/netxen_nic_phan_reg.h
@@ -126,8 +126,11 @@
  */
 #define CRB_NIC_CAPABILITIES_HOST	NETXEN_NIC_REG(0x1a8)
 #define CRB_NIC_CAPABILITIES_FW	  	NETXEN_NIC_REG(0x1dc)
+#define CRB_NIC_MSI_MODE_HOST		NETXEN_NIC_REG(0x270)
+#define CRB_NIC_MSI_MODE_FW	  		NETXEN_NIC_REG(0x274)
 
 #define INTR_SCHEME_PERPORT	      	0x1
+#define MSI_MODE_MULTIFUNC	      	0x1
 
 /* used for ethtool tests */
 #define CRB_SCRATCHPAD_TEST	    NETXEN_NIC_REG(0x280)