S2io: Added napi support when MSIX is enabled.

- Added napi support when MSIX is enabled.
- Moved test_msi function from s2io_open to probe function.

Signed-off-by: Sreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: Ramkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

3 files changed, 205 insertions, 141 deletions

diff --git a/drivers/net/s2io-regs.h b/drivers/net/s2io-regs.h
index 2109508c047..f8274f8941e 100644
--- a/drivers/net/s2io-regs.h
+++ b/drivers/net/s2io-regs.h
@@ -250,7 +250,7 @@ struct XENA_dev_config {
         u64 tx_mat0_n[0x8];
 #define TX_MAT_SET(fifo, msi)                   vBIT(msi, (8 * fifo), 8)
 
-        u8 unused_1[0x8];
+        u64 xmsi_mask_reg;
         u64 stat_byte_cnt;
 #define STAT_BC(n)                              vBIT(n,4,12)
 
diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index e161a847c53..807fb8db8c4 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -2832,6 +2832,15 @@ static void free_rx_buffers(struct s2io_nic *sp)
         }
 }
 
+static int s2io_chk_rx_buffers(struct ring_info *ring)
+{
+        if (fill_rx_buffers(ring) == -ENOMEM) {
+                DBG_PRINT(INFO_DBG, "%s:Out of memory", ring->dev->name);
+                DBG_PRINT(INFO_DBG, " in Rx Intr!!\n");
+        }
+        return 0;
+}
+
 /**
  * s2io_poll - Rx interrupt handler for NAPI support
  * @napi : pointer to the napi structure.
@@ -2845,57 +2854,72 @@ static void free_rx_buffers(struct s2io_nic *sp)
  * 0 on success and 1 if there are No Rx packets to be processed.
  */
 
-static int s2io_poll(struct napi_struct *napi, int budget)
+static int s2io_poll_msix(struct napi_struct *napi, int budget)
 {
-        struct s2io_nic *nic = container_of(napi, struct s2io_nic, napi);
-        struct net_device *dev = nic->dev;
-        int pkt_cnt = 0, org_pkts_to_process;
-        struct mac_info *mac_control;
+        struct ring_info *ring = container_of(napi, struct ring_info, napi);
+        struct net_device *dev = ring->dev;
         struct config_param *config;
+        struct mac_info *mac_control;
+        int pkts_processed = 0;
+        u8 *addr = NULL, val8 = 0;
+        struct s2io_nic *nic = dev->priv;
         struct XENA_dev_config __iomem *bar0 = nic->bar0;
-        int i;
+        int budget_org = budget;
 
-        mac_control = &nic->mac_control;
         config = &nic->config;
+        mac_control = &nic->mac_control;
 
-        nic->pkts_to_process = budget;
-        org_pkts_to_process = nic->pkts_to_process;
+        if (unlikely(!is_s2io_card_up(nic)))
+                return 0;
 
-        writeq(S2IO_MINUS_ONE, &bar0->rx_traffic_int);
-        readl(&bar0->rx_traffic_int);
+        pkts_processed = rx_intr_handler(ring, budget);
+        s2io_chk_rx_buffers(ring);
 
-        for (i = 0; i < config->rx_ring_num; i++) {
-                rx_intr_handler(&mac_control->rings[i]);
-                pkt_cnt = org_pkts_to_process - nic->pkts_to_process;
-                if (!nic->pkts_to_process) {
-                        /* Quota for the current iteration has been met */
-                        goto no_rx;
-                }
+        if (pkts_processed < budget_org) {
+                netif_rx_complete(dev, napi);
+                /*Re Enable MSI-Rx Vector*/
+                addr = (u8 *)&bar0->xmsi_mask_reg;
+                addr += 7 - ring->ring_no;
+                val8 = (ring->ring_no == 0) ? 0x3f : 0xbf;
+                writeb(val8, addr);
+                val8 = readb(addr);
         }
+        return pkts_processed;
+}
+static int s2io_poll_inta(struct napi_struct *napi, int budget)
+{
+        struct s2io_nic *nic = container_of(napi, struct s2io_nic, napi);
+        struct ring_info *ring;
+        struct net_device *dev = nic->dev;
+        struct config_param *config;
+        struct mac_info *mac_control;
+        int pkts_processed = 0;
+        int ring_pkts_processed, i;
+        struct XENA_dev_config __iomem *bar0 = nic->bar0;
+        int budget_org = budget;
 
-        netif_rx_complete(dev, napi);
+        config = &nic->config;
+        mac_control = &nic->mac_control;
 
-        for (i = 0; i < config->rx_ring_num; i++) {
-                if (fill_rx_buffers(&mac_control->rings[i]) == -ENOMEM) {
-                        DBG_PRINT(INFO_DBG, "%s:Out of memory", dev->name);
-                        DBG_PRINT(INFO_DBG, " in Rx Poll!!\n");
-                        break;
-                }
-        }
-        /* Re enable the Rx interrupts. */
-        writeq(0x0, &bar0->rx_traffic_mask);
-        readl(&bar0->rx_traffic_mask);
-        return pkt_cnt;
+        if (unlikely(!is_s2io_card_up(nic)))
+                return 0;
 
-no_rx:
         for (i = 0; i < config->rx_ring_num; i++) {
-                if (fill_rx_buffers(&mac_control->rings[i]) == -ENOMEM) {
-                        DBG_PRINT(INFO_DBG, "%s:Out of memory", dev->name);
-                        DBG_PRINT(INFO_DBG, " in Rx Poll!!\n");
+                ring = &mac_control->rings[i];
+                ring_pkts_processed = rx_intr_handler(ring, budget);
+                s2io_chk_rx_buffers(ring);
+                pkts_processed += ring_pkts_processed;
+                budget -= ring_pkts_processed;
+                if (budget <= 0)
                         break;
-                }
         }
-        return pkt_cnt;
+        if (pkts_processed < budget_org) {
+                netif_rx_complete(dev, napi);
+                /* Re enable the Rx interrupts for the ring */
+                writeq(0, &bar0->rx_traffic_mask);
+                readl(&bar0->rx_traffic_mask);
+        }
+        return pkts_processed;
 }
 
 #ifdef CONFIG_NET_POLL_CONTROLLER
@@ -2937,7 +2961,7 @@ static void s2io_netpoll(struct net_device *dev)
 
         /* check for received packet and indicate up to network */
         for (i = 0; i < config->rx_ring_num; i++)
-                rx_intr_handler(&mac_control->rings[i]);
+                rx_intr_handler(&mac_control->rings[i], 0);
 
         for (i = 0; i < config->rx_ring_num; i++) {
                 if (fill_rx_buffers(&mac_control->rings[i]) == -ENOMEM) {
@@ -2953,7 +2977,8 @@ static void s2io_netpoll(struct net_device *dev)
 
 /**
  *  rx_intr_handler - Rx interrupt handler
- *  @nic: device private variable.
+ *  @ring_info: per ring structure.
+ *  @budget: budget for napi processing.
  *  Description:
  *  If the interrupt is because of a received frame or if the
  *  receive ring contains fresh as yet un-processed frames,this function is
@@ -2961,15 +2986,15 @@ static void s2io_netpoll(struct net_device *dev)
  *  stopped and sends the skb to the OSM's Rx handler and then increments
  *  the offset.
  *  Return Value:
- *  NONE.
+ *  No. of napi packets processed.
  */
-static void rx_intr_handler(struct ring_info *ring_data)
+static int rx_intr_handler(struct ring_info *ring_data, int budget)
 {
         int get_block, put_block;
         struct rx_curr_get_info get_info, put_info;
         struct RxD_t *rxdp;
         struct sk_buff *skb;
-        int pkt_cnt = 0;
+        int pkt_cnt = 0, napi_pkts = 0;
         int i;
         struct RxD1* rxdp1;
         struct RxD3* rxdp3;
@@ -2996,7 +3021,7 @@ static void rx_intr_handler(struct ring_info *ring_data)
                         DBG_PRINT(ERR_DBG, "%s: The skb is ",
                                   ring_data->dev->name);
                         DBG_PRINT(ERR_DBG, "Null in Rx Intr\n");
-                        return;
+                        return 0;
                 }
                 if (ring_data->rxd_mode == RXD_MODE_1) {
                         rxdp1 = (struct RxD1*)rxdp;
@@ -3033,9 +3058,10 @@ static void rx_intr_handler(struct ring_info *ring_data)
                         rxdp = ring_data->rx_blocks[get_block].block_virt_addr;
                 }
 
-                if(ring_data->nic->config.napi){
-                        ring_data->nic->pkts_to_process -= 1;
-                        if (!ring_data->nic->pkts_to_process)
+                if (ring_data->nic->config.napi) {
+                        budget--;
+                        napi_pkts++;
+                        if (!budget)
                                 break;
                 }
                 pkt_cnt++;
@@ -3053,6 +3079,7 @@ static void rx_intr_handler(struct ring_info *ring_data)
                         }
                 }
         }
+        return(napi_pkts);
 }
 
 /**
@@ -3749,14 +3776,19 @@ static void restore_xmsi_data(struct s2io_nic *nic)
 {
         struct XENA_dev_config __iomem *bar0 = nic->bar0;
         u64 val64;
-        int i;
+        int i, msix_index;
+
+
+        if (nic->device_type == XFRAME_I_DEVICE)
+                return;
 
         for (i=0; i < MAX_REQUESTED_MSI_X; i++) {
+                msix_index = (i) ? ((i-1) * 8 + 1): 0;
                 writeq(nic->msix_info[i].addr, &bar0->xmsi_address);
                 writeq(nic->msix_info[i].data, &bar0->xmsi_data);
-                val64 = (s2BIT(7) | s2BIT(15) | vBIT(i, 26, 6));
+                val64 = (s2BIT(7) | s2BIT(15) | vBIT(msix_index, 26, 6));
                 writeq(val64, &bar0->xmsi_access);
-                if (wait_for_msix_trans(nic, i)) {
+                if (wait_for_msix_trans(nic, msix_index)) {
                         DBG_PRINT(ERR_DBG, "failed in %s\n", __FUNCTION__);
                         continue;
                 }
@@ -3767,13 +3799,17 @@ static void store_xmsi_data(struct s2io_nic *nic)
 {
         struct XENA_dev_config __iomem *bar0 = nic->bar0;
         u64 val64, addr, data;
-        int i;
+        int i, msix_index;
+
+        if (nic->device_type == XFRAME_I_DEVICE)
+                return;
 
         /* Store and display */
         for (i=0; i < MAX_REQUESTED_MSI_X; i++) {
-                val64 = (s2BIT(15) | vBIT(i, 26, 6));
+                msix_index = (i) ? ((i-1) * 8 + 1): 0;
+                val64 = (s2BIT(15) | vBIT(msix_index, 26, 6));
                 writeq(val64, &bar0->xmsi_access);
-                if (wait_for_msix_trans(nic, i)) {
+                if (wait_for_msix_trans(nic, msix_index)) {
                         DBG_PRINT(ERR_DBG, "failed in %s\n", __FUNCTION__);
                         continue;
                 }
@@ -3793,7 +3829,7 @@ static int s2io_enable_msi_x(struct s2io_nic *nic)
         u16 msi_control; /* Temp variable */
         int ret, i, j, msix_indx = 1;
 
-        nic->entries = kcalloc(MAX_REQUESTED_MSI_X, sizeof(struct msix_entry),
+        nic->entries = kmalloc(nic->num_entries * sizeof(struct msix_entry),
                                GFP_KERNEL);
         if (!nic->entries) {
                 DBG_PRINT(INFO_DBG, "%s: Memory allocation failed\n", \
@@ -3802,10 +3838,12 @@ static int s2io_enable_msi_x(struct s2io_nic *nic)
                 return -ENOMEM;
         }
         nic->mac_control.stats_info->sw_stat.mem_allocated
-                += (MAX_REQUESTED_MSI_X * sizeof(struct msix_entry));
+                += (nic->num_entries * sizeof(struct msix_entry));
+
+        memset(nic->entries, 0, nic->num_entries * sizeof(struct msix_entry));
 
         nic->s2io_entries =
-                kcalloc(MAX_REQUESTED_MSI_X, sizeof(struct s2io_msix_entry),
+                kmalloc(nic->num_entries * sizeof(struct s2io_msix_entry),
                                    GFP_KERNEL);
         if (!nic->s2io_entries) {
                 DBG_PRINT(INFO_DBG, "%s: Memory allocation failed\n",
@@ -3813,11 +3851,13 @@ static int s2io_enable_msi_x(struct s2io_nic *nic)
                 nic->mac_control.stats_info->sw_stat.mem_alloc_fail_cnt++;
                 kfree(nic->entries);
                 nic->mac_control.stats_info->sw_stat.mem_freed
-                        += (MAX_REQUESTED_MSI_X * sizeof(struct msix_entry));
+                        += (nic->num_entries * sizeof(struct msix_entry));
                 return -ENOMEM;
         }
          nic->mac_control.stats_info->sw_stat.mem_allocated
-                += (MAX_REQUESTED_MSI_X * sizeof(struct s2io_msix_entry));
+                += (nic->num_entries * sizeof(struct s2io_msix_entry));
+        memset(nic->s2io_entries, 0,
+                nic->num_entries * sizeof(struct s2io_msix_entry));
 
         nic->entries[0].entry = 0;
         nic->s2io_entries[0].entry = 0;
@@ -3825,45 +3865,38 @@ static int s2io_enable_msi_x(struct s2io_nic *nic)
         nic->s2io_entries[0].type = MSIX_ALARM_TYPE;
         nic->s2io_entries[0].arg = &nic->mac_control.fifos;
 
-        for (i = 1; i < MAX_REQUESTED_MSI_X; i++) {
-                nic->entries[i].entry = i;
-                nic->s2io_entries[i].entry = i;
+        for (i = 1; i < nic->num_entries; i++) {
+                nic->entries[i].entry = ((i - 1) * 8) + 1;
+                nic->s2io_entries[i].entry = ((i - 1) * 8) + 1;
                 nic->s2io_entries[i].arg = NULL;
                 nic->s2io_entries[i].in_use = 0;
         }
 
         rx_mat = readq(&bar0->rx_mat);
-        for (j = 0; j < nic->config.rx_ring_num; j++, msix_indx++) {
+        for (j = 0; j < nic->config.rx_ring_num; j++) {
                 rx_mat |= RX_MAT_SET(j, msix_indx);
-                nic->s2io_entries[msix_indx].arg
-                        = &nic->mac_control.rings[j];
-                nic->s2io_entries[msix_indx].type = MSIX_RING_TYPE;
-                nic->s2io_entries[msix_indx].in_use = MSIX_FLG;
+                nic->s2io_entries[j+1].arg = &nic->mac_control.rings[j];
+                nic->s2io_entries[j+1].type = MSIX_RING_TYPE;
+                nic->s2io_entries[j+1].in_use = MSIX_FLG;
+                msix_indx += 8;
         }
         writeq(rx_mat, &bar0->rx_mat);
+        readq(&bar0->rx_mat);
 
-        nic->avail_msix_vectors = 0;
-        ret = pci_enable_msix(nic->pdev, nic->entries, MAX_REQUESTED_MSI_X);
+        ret = pci_enable_msix(nic->pdev, nic->entries, nic->num_entries);
         /* We fail init if error or we get less vectors than min required */
-        if (ret >= (nic->config.tx_fifo_num + nic->config.rx_ring_num + 1)) {
-                nic->avail_msix_vectors = ret;
-                ret = pci_enable_msix(nic->pdev, nic->entries, ret);
-        }
         if (ret) {
                 DBG_PRINT(ERR_DBG, "%s: Enabling MSIX failed\n", nic->dev->name);
                 kfree(nic->entries);
                 nic->mac_control.stats_info->sw_stat.mem_freed
-                        += (MAX_REQUESTED_MSI_X * sizeof(struct msix_entry));
+                        += (nic->num_entries * sizeof(struct msix_entry));
                 kfree(nic->s2io_entries);
                 nic->mac_control.stats_info->sw_stat.mem_freed
-                += (MAX_REQUESTED_MSI_X * sizeof(struct s2io_msix_entry));
+                        += (nic->num_entries * sizeof(struct s2io_msix_entry));
                 nic->entries = NULL;
                 nic->s2io_entries = NULL;
-                nic->avail_msix_vectors = 0;
                 return -ENOMEM;
         }
-        if (!nic->avail_msix_vectors)
-                nic->avail_msix_vectors = MAX_REQUESTED_MSI_X;
 
         /*
          * To enable MSI-X, MSI also needs to be enabled, due to a bug
@@ -3935,7 +3968,7 @@ static void remove_msix_isr(struct s2io_nic *sp)
         int i;
         u16 msi_control;
 
-        for (i = 0; i < MAX_REQUESTED_MSI_X; i++) {
+        for (i = 0; i < sp->num_entries; i++) {
                 if (sp->s2io_entries[i].in_use ==
                         MSIX_REGISTERED_SUCCESS) {
                         int vector = sp->entries[i].vector;
@@ -3991,29 +4024,6 @@ static int s2io_open(struct net_device *dev)
         netif_carrier_off(dev);
         sp->last_link_state = 0;
 
-        if (sp->config.intr_type == MSI_X) {
-                int ret = s2io_enable_msi_x(sp);
-
-                if (!ret) {
-                        ret = s2io_test_msi(sp);
-                        /* rollback MSI-X, will re-enable during add_isr() */
-                        remove_msix_isr(sp);
-                }
-                if (ret) {
-
-                        DBG_PRINT(ERR_DBG,
-                          "%s: MSI-X requested but failed to enable\n",
-                          dev->name);
-                        sp->config.intr_type = INTA;
-                }
-        }
-
-        /* NAPI doesn't work well with MSI(X) */
-         if (sp->config.intr_type != INTA) {
-                if(sp->config.napi)
-                        sp->config.napi = 0;
-        }
-
         /* Initialize H/W and enable interrupts */
         err = s2io_card_up(sp);
         if (err) {
@@ -4036,12 +4046,12 @@ hw_init_failed:
                 if (sp->entries) {
                         kfree(sp->entries);
                         sp->mac_control.stats_info->sw_stat.mem_freed
-                        += (MAX_REQUESTED_MSI_X * sizeof(struct msix_entry));
+                        += (sp->num_entries * sizeof(struct msix_entry));
                 }
                 if (sp->s2io_entries) {
                         kfree(sp->s2io_entries);
                         sp->mac_control.stats_info->sw_stat.mem_freed
-                        += (MAX_REQUESTED_MSI_X * sizeof(struct s2io_msix_entry));
+                        += (sp->num_entries * sizeof(struct s2io_msix_entry));
                 }
         }
         return err;
@@ -4343,25 +4353,29 @@ s2io_alarm_handle(unsigned long data)
         mod_timer(&sp->alarm_timer, jiffies + HZ / 2);
 }
 
-static int s2io_chk_rx_buffers(struct ring_info *ring)
-{
-        if (fill_rx_buffers(ring) == -ENOMEM) {
-                DBG_PRINT(INFO_DBG, "%s:Out of memory", ring->dev->name);
-                DBG_PRINT(INFO_DBG, " in Rx Intr!!\n");
-        }
-        return 0;
-}
-
 static irqreturn_t s2io_msix_ring_handle(int irq, void *dev_id)
 {
         struct ring_info *ring = (struct ring_info *)dev_id;
         struct s2io_nic *sp = ring->nic;
+        struct XENA_dev_config __iomem *bar0 = sp->bar0;
+        struct net_device *dev = sp->dev;
 
-        if (!is_s2io_card_up(sp))
+        if (unlikely(!is_s2io_card_up(sp)))
                 return IRQ_HANDLED;
 
-        rx_intr_handler(ring);
-        s2io_chk_rx_buffers(ring);
+        if (sp->config.napi) {
+                u8 *addr = NULL, val8 = 0;
+
+                addr = (u8 *)&bar0->xmsi_mask_reg;
+                addr += (7 - ring->ring_no);
+                val8 = (ring->ring_no == 0) ? 0x7f : 0xff;
+                writeb(val8, addr);
+                val8 = readb(addr);
+                netif_rx_schedule(dev, &ring->napi);
+        } else {
+                rx_intr_handler(ring, 0);
+                s2io_chk_rx_buffers(ring);
+        }
 
         return IRQ_HANDLED;
 }
@@ -4798,14 +4812,10 @@ static irqreturn_t s2io_isr(int irq, void *dev_id)
 
                 if (config->napi) {
                         if (reason & GEN_INTR_RXTRAFFIC) {
-                                if (likely(netif_rx_schedule_prep(dev,
-                                                        &sp->napi))) {
-                                        __netif_rx_schedule(dev, &sp->napi);
-                                        writeq(S2IO_MINUS_ONE,
-                                               &bar0->rx_traffic_mask);
-                                } else
-                                        writeq(S2IO_MINUS_ONE,
-                                               &bar0->rx_traffic_int);
+                                netif_rx_schedule(dev, &sp->napi);
+                                writeq(S2IO_MINUS_ONE, &bar0->rx_traffic_mask);
+                                writeq(S2IO_MINUS_ONE, &bar0->rx_traffic_int);
+                                readl(&bar0->rx_traffic_int);
                         }
                 } else {
                         /*
@@ -4817,7 +4827,7 @@ static irqreturn_t s2io_isr(int irq, void *dev_id)
                                 writeq(S2IO_MINUS_ONE, &bar0->rx_traffic_int);
 
                         for (i = 0; i < config->rx_ring_num; i++)
-                                rx_intr_handler(&mac_control->rings[i]);
+                                rx_intr_handler(&mac_control->rings[i], 0);
                 }
 
                 /*
@@ -7022,8 +7032,9 @@ static int s2io_add_isr(struct s2io_nic * sp)
         if (sp->config.intr_type == MSI_X) {
                 int i, msix_rx_cnt = 0;
 
-                for (i = 0; (sp->s2io_entries[i].in_use == MSIX_FLG); i++) {
-                        if (sp->s2io_entries[i].type ==
+                for (i = 0; i < sp->num_entries; i++) {
+                        if (sp->s2io_entries[i].in_use == MSIX_FLG) {
+                                if (sp->s2io_entries[i].type ==
                                         MSIX_RING_TYPE) {
                                         sprintf(sp->desc[i], "%s:MSI-X-%d-RX",
                                                 dev->name, i);
@@ -7068,7 +7079,7 @@ static int s2io_add_isr(struct s2io_nic * sp)
                                 }
                                 sp->s2io_entries[i].in_use =
                                         MSIX_REGISTERED_SUCCESS;
-
+                        }
                 }
                 if (!err) {
                         printk(KERN_INFO "MSI-X-RX %d entries enabled\n",
@@ -7115,8 +7126,15 @@ static void do_s2io_card_down(struct s2io_nic * sp, int do_io)
         clear_bit(__S2IO_STATE_CARD_UP, &sp->state);
 
         /* Disable napi */
-        if (config->napi)
-                napi_disable(&sp->napi);
+        if (sp->config.napi) {
+                int off = 0;
+                if (config->intr_type ==  MSI_X) {
+                        for (; off < sp->config.rx_ring_num; off++)
+                                napi_disable(&sp->mac_control.rings[off].napi);
+                        }
+                else
+                        napi_disable(&sp->napi);
+        }
 
         /* disable Tx and Rx traffic on the NIC */
         if (do_io)
@@ -7208,8 +7226,15 @@ static int s2io_card_up(struct s2io_nic * sp)
         }
 
         /* Initialise napi */
-        if (config->napi)
-                napi_enable(&sp->napi);
+        if (config->napi) {
+                int i;
+                if (config->intr_type ==  MSI_X) {
+                        for (i = 0; i < sp->config.rx_ring_num; i++)
+                                napi_enable(&sp->mac_control.rings[i].napi);
+                } else {
+                        napi_enable(&sp->napi);
+                }
+        }
 
         /* Maintain the state prior to the open */
         if (sp->promisc_flg)
@@ -7650,9 +7675,6 @@ static int s2io_verify_parm(struct pci_dev *pdev, u8 *dev_intr_type,
                 rx_ring_num = MAX_RX_RINGS;
         }
 
-        if (*dev_intr_type != INTA)
-                napi = 0;
-
         if ((*dev_intr_type != INTA) && (*dev_intr_type != MSI_X)) {
                 DBG_PRINT(ERR_DBG, "s2io: Wrong intr_type requested. "
                           "Defaulting to INTA\n");
@@ -7953,8 +7975,6 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
          * will use eth_mac_addr() for  dev->set_mac_address
          * mac address will be set every time dev->open() is called
          */
-        netif_napi_add(dev, &sp->napi, s2io_poll, 32);
-
 #ifdef CONFIG_NET_POLL_CONTROLLER
         dev->poll_controller = s2io_netpoll;
 #endif
@@ -7998,6 +8018,32 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
                 }
         }
 
+        if (sp->config.intr_type == MSI_X) {
+                sp->num_entries = config->rx_ring_num + 1;
+                ret = s2io_enable_msi_x(sp);
+
+                if (!ret) {
+                        ret = s2io_test_msi(sp);
+                        /* rollback MSI-X, will re-enable during add_isr() */
+                        remove_msix_isr(sp);
+                }
+                if (ret) {
+
+                        DBG_PRINT(ERR_DBG,
+                          "%s: MSI-X requested but failed to enable\n",
+                          dev->name);
+                        sp->config.intr_type = INTA;
+                }
+        }
+
+        if (config->intr_type ==  MSI_X) {
+                for (i = 0; i < config->rx_ring_num ; i++)
+                        netif_napi_add(dev, &mac_control->rings[i].napi,
+                                s2io_poll_msix, 64);
+        } else {
+                netif_napi_add(dev, &sp->napi, s2io_poll_inta, 64);
+        }
+
         /* Not needed for Herc */
         if (sp->device_type & XFRAME_I_DEVICE) {
                 /*
@@ -8048,6 +8094,11 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
         /* store mac addresses from CAM to s2io_nic structure */
         do_s2io_store_unicast_mc(sp);
 
+        /* Configure MSIX vector for number of rings configured plus one */
+        if ((sp->device_type == XFRAME_II_DEVICE) &&
+                (config->intr_type == MSI_X))
+                sp->num_entries = config->rx_ring_num + 1;
+
          /* Store the values of the MSIX table in the s2io_nic structure */
         store_xmsi_data(sp);
         /* reset Nic and bring it to known state */
@@ -8113,8 +8164,14 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
                     break;
         }
 
-        if (napi)
+        switch (sp->config.napi) {
+        case 0:
+                DBG_PRINT(ERR_DBG, "%s: NAPI disabled\n", dev->name);
+                break;
+        case 1:
                 DBG_PRINT(ERR_DBG, "%s: NAPI enabled\n", dev->name);
+                break;
+        }
 
         DBG_PRINT(ERR_DBG, "%s: Using %d Tx fifo(s)\n", dev->name,
                 sp->config.tx_fifo_num);
diff --git a/drivers/net/s2io.h b/drivers/net/s2io.h
index 9a4b772f741..4706f7f9acb 100644
--- a/drivers/net/s2io.h
+++ b/drivers/net/s2io.h
@@ -706,7 +706,7 @@ struct ring_info {
         /* per-ring buffer counter */
         u32 rx_bufs_left;
 
-        #define MAX_LRO_SESSIONS        32
+#define MAX_LRO_SESSIONS       32
         struct lro lro0_n[MAX_LRO_SESSIONS];
         u8              lro;
 
@@ -725,6 +725,11 @@ struct ring_info {
         /* copy of sp->pdev pointer */
         struct pci_dev *pdev;
 
+        /* Per ring napi struct */
+        struct napi_struct napi;
+
+        unsigned long interrupt_count;
+
         /*
          *  Place holders for the virtual and physical addresses of
          *  all the Rx Blocks
@@ -841,7 +846,7 @@ struct usr_addr {
  * Structure to keep track of the MSI-X vectors and the corresponding
  * argument registered against each vector
  */
-#define MAX_REQUESTED_MSI_X     17
+#define MAX_REQUESTED_MSI_X     9
 struct s2io_msix_entry
 {
         u16 vector;
@@ -877,7 +882,6 @@ struct s2io_nic {
          */
         int pkts_to_process;
         struct net_device *dev;
-        struct napi_struct napi;
         struct mac_info mac_control;
         struct config_param config;
         struct pci_dev *pdev;
@@ -948,6 +952,7 @@ struct s2io_nic {
         */
         u8 other_fifo_idx;
 
+        struct napi_struct napi;
         /*  after blink, the adapter must be restored with original
          *  values.
          */
@@ -962,6 +967,7 @@ struct s2io_nic {
         unsigned long long start_time;
         struct vlan_group *vlgrp;
 #define MSIX_FLG                0xA5
+        int num_entries;
         struct msix_entry *entries;
         int msi_detected;
         wait_queue_head_t msi_wait;
@@ -1104,7 +1110,7 @@ static void __devexit s2io_rem_nic(struct pci_dev *pdev);
 static int init_shared_mem(struct s2io_nic *sp);
 static void free_shared_mem(struct s2io_nic *sp);
 static int init_nic(struct s2io_nic *nic);
-static void rx_intr_handler(struct ring_info *ring_data);
+static int rx_intr_handler(struct ring_info *ring_data, int budget);
 static void tx_intr_handler(struct fifo_info *fifo_data);
 static void s2io_handle_errors(void * dev_id);
 
@@ -1115,7 +1121,8 @@ static void s2io_set_multicast(struct net_device *dev);
 static int rx_osm_handler(struct ring_info *ring_data, struct RxD_t * rxdp);
 static void s2io_link(struct s2io_nic * sp, int link);
 static void s2io_reset(struct s2io_nic * sp);
-static int s2io_poll(struct napi_struct *napi, int budget);
+static int s2io_poll_msix(struct napi_struct *napi, int budget);
+static int s2io_poll_inta(struct napi_struct *napi, int budget);
 static void s2io_init_pci(struct s2io_nic * sp);
 static int do_s2io_prog_unicast(struct net_device *dev, u8 *addr);
 static void s2io_alarm_handle(unsigned long data);