s2io: Making LRO and UFO as module loadable parameter.

This patch adds two load parameters napi and ufo. Previously NAPI was
compilation option with these changes wan enable disable NAPI using load
parameter. Also we are introducing ufo load parameter to enable/disable
ufo feature

Signed-off-by: Sivakumar Subramani <sivakumar.subramani@neterion.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 77 insertions, 85 deletions

diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index 36937cb..063040b 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -401,9 +401,10 @@ S2IO_PARM_INT(lro, 0);
  * aggregation happens until we hit max IP pkt size(64K)
  */
 S2IO_PARM_INT(lro_max_pkts, 0xFFFF);
-#ifndef CONFIG_S2IO_NAPI
 S2IO_PARM_INT(indicate_max_pkts, 0);
-#endif
+
+S2IO_PARM_INT(napi, 1);
+S2IO_PARM_INT(ufo, 0);
 
 static unsigned int tx_fifo_len[MAX_TX_FIFOS] =
     {DEFAULT_FIFO_0_LEN, [1 ...(MAX_TX_FIFOS - 1)] = DEFAULT_FIFO_1_7_LEN};
@@ -2274,9 +2275,7 @@ static int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
 	struct config_param *config;
 	u64 tmp;
 	buffAdd_t *ba;
-#ifndef CONFIG_S2IO_NAPI
 	unsigned long flags;
-#endif
 	RxD_t *first_rxdp = NULL;
 
 	mac_control = &nic->mac_control;
@@ -2320,12 +2319,15 @@ static int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
 			DBG_PRINT(INTR_DBG, "%s: Next block at: %p\n",
 				  dev->name, rxdp);
 		}
-#ifndef CONFIG_S2IO_NAPI
-		spin_lock_irqsave(&nic->put_lock, flags);
-		mac_control->rings[ring_no].put_pos =
-		    (block_no * (rxd_count[nic->rxd_mode] + 1)) + off;
-		spin_unlock_irqrestore(&nic->put_lock, flags);
-#endif
+		if(!napi) {
+			spin_lock_irqsave(&nic->put_lock, flags);
+			mac_control->rings[ring_no].put_pos =
+			(block_no * (rxd_count[nic->rxd_mode] + 1)) + off;
+			spin_unlock_irqrestore(&nic->put_lock, flags);
+		} else {
+			mac_control->rings[ring_no].put_pos =
+			(block_no * (rxd_count[nic->rxd_mode] + 1)) + off;
+		}
 		if ((rxdp->Control_1 & RXD_OWN_XENA) &&
 			((nic->rxd_mode >= RXD_MODE_3A) &&
 				(rxdp->Control_2 & BIT(0)))) {
@@ -2568,7 +2570,6 @@ static void free_rx_buffers(struct s2io_nic *sp)
  * 0 on success and 1 if there are No Rx packets to be processed.
  */
 
-#if defined(CONFIG_S2IO_NAPI)
 static int s2io_poll(struct net_device *dev, int *budget)
 {
 	nic_t *nic = dev->priv;
@@ -2633,7 +2634,6 @@ no_rx:
 	atomic_dec(&nic->isr_cnt);
 	return 1;
 }
-#endif
 
 #ifdef CONFIG_NET_POLL_CONTROLLER
 /**
@@ -2707,9 +2707,7 @@ static void rx_intr_handler(ring_info_t *ring_data)
 	rx_curr_get_info_t get_info, put_info;
 	RxD_t *rxdp;
 	struct sk_buff *skb;
-#ifndef CONFIG_S2IO_NAPI
 	int pkt_cnt = 0;
-#endif
 	int i;
 
 	spin_lock(&nic->rx_lock);
@@ -2725,16 +2723,18 @@ static void rx_intr_handler(ring_info_t *ring_data)
 	put_info = ring_data->rx_curr_put_info;
 	put_block = put_info.block_index;
 	rxdp = ring_data->rx_blocks[get_block].rxds[get_info.offset].virt_addr;
-#ifndef CONFIG_S2IO_NAPI
-	spin_lock(&nic->put_lock);
-	put_offset = ring_data->put_pos;
-	spin_unlock(&nic->put_lock);
-#else
-	put_offset = (put_block * (rxd_count[nic->rxd_mode] + 1)) +
-		put_info.offset;
-#endif
+	if (!napi) {
+		spin_lock(&nic->put_lock);
+		put_offset = ring_data->put_pos;
+		spin_unlock(&nic->put_lock);
+	} else
+		put_offset = ring_data->put_pos;
+
 	while (RXD_IS_UP2DT(rxdp)) {
-		/* If your are next to put index then it's FIFO full condition */
+		/*
+		 * If your are next to put index then it's
+		 * FIFO full condition
+		 */
 		if ((get_block == put_block) &&
 		    (get_info.offset + 1) == put_info.offset) {
 			DBG_PRINT(INTR_DBG, "%s: Ring Full\n",dev->name);
@@ -2792,15 +2792,12 @@ static void rx_intr_handler(ring_info_t *ring_data)
 			rxdp = ring_data->rx_blocks[get_block].block_virt_addr;
 		}
 
-#ifdef CONFIG_S2IO_NAPI
 		nic->pkts_to_process -= 1;
-		if (!nic->pkts_to_process)
+		if ((napi) && (!nic->pkts_to_process))
 			break;
-#else
 		pkt_cnt++;
 		if ((indicate_max_pkts) && (pkt_cnt > indicate_max_pkts))
 			break;
-#endif
 	}
 	if (nic->lro) {
 		/* Clear all LRO sessions before exiting */
@@ -4193,26 +4190,26 @@ static irqreturn_t s2io_isr(int irq, void *dev_id)
 	org_mask = readq(&bar0->general_int_mask);
 	writeq(val64, &bar0->general_int_mask);
 
-#ifdef CONFIG_S2IO_NAPI
-	if (reason & GEN_INTR_RXTRAFFIC) {
-		if (netif_rx_schedule_prep(dev)) {
-			writeq(val64, &bar0->rx_traffic_mask);
-			__netif_rx_schedule(dev);
+	if (napi) {
+		if (reason & GEN_INTR_RXTRAFFIC) {
+			if (netif_rx_schedule_prep(dev)) {
+				writeq(val64, &bar0->rx_traffic_mask);
+				__netif_rx_schedule(dev);
+			}
+		}
+	} else {
+		/*
+		 * Rx handler is called by default, without checking for the
+		 * cause of interrupt.
+		 * rx_traffic_int reg is an R1 register, writing all 1's
+		 * will ensure that the actual interrupt causing bit get's
+		 * cleared and hence a read can be avoided.
+		 */
+		writeq(val64, &bar0->rx_traffic_int);
+		for (i = 0; i < config->rx_ring_num; i++) {
+			rx_intr_handler(&mac_control->rings[i]);
 		}
 	}
-#else
-	/*
-	 * Rx handler is called by default, without checking for the
-	 * cause of interrupt.
-	 * rx_traffic_int reg is an R1 register, writing all 1's
-	 * will ensure that the actual interrupt causing bit get's
-	 * cleared and hence a read can be avoided.
-	 */
-	writeq(val64, &bar0->rx_traffic_int);
-	for (i = 0; i < config->rx_ring_num; i++) {
-		rx_intr_handler(&mac_control->rings[i]);
-	}
-#endif
 
 	/*
 	 * tx_traffic_int reg is an R1 register, writing all 1's
@@ -4231,11 +4228,14 @@ static irqreturn_t s2io_isr(int irq, void *dev_id)
 	 * reallocate the buffers from the interrupt handler itself,
 	 * else schedule a tasklet to reallocate the buffers.
 	 */
-#ifndef CONFIG_S2IO_NAPI
-	for (i = 0; i < config->rx_ring_num; i++)
-		s2io_chk_rx_buffers(sp, i);
-#endif
-	writeq(org_mask, &bar0->general_int_mask);
+	if (!napi) {
+		for (i = 0; i < config->rx_ring_num; i++)
+			s2io_chk_rx_buffers(sp, i);
+	}
+
+	writeq(0, &bar0->general_int_mask);
+	readl(&bar0->general_int_status);
+
 	atomic_dec(&sp->isr_cnt);
 	return IRQ_HANDLED;
 }
@@ -6578,23 +6578,20 @@ static int rx_osm_handler(ring_info_t *ring_data, RxD_t * rxdp)
 
 	if (!sp->lro) {
 		skb->protocol = eth_type_trans(skb, dev);
-#ifdef CONFIG_S2IO_NAPI
 		if (sp->vlgrp && RXD_GET_VLAN_TAG(rxdp->Control_2)) {
 			/* Queueing the vlan frame to the upper layer */
-			vlan_hwaccel_receive_skb(skb, sp->vlgrp,
-				RXD_GET_VLAN_TAG(rxdp->Control_2));
-		} else {
-			netif_receive_skb(skb);
-		}
-#else
-		if (sp->vlgrp && RXD_GET_VLAN_TAG(rxdp->Control_2)) {
-			/* Queueing the vlan frame to the upper layer */
-			vlan_hwaccel_rx(skb, sp->vlgrp,
-				RXD_GET_VLAN_TAG(rxdp->Control_2));
+			if (napi)
+				vlan_hwaccel_receive_skb(skb, sp->vlgrp,
+					RXD_GET_VLAN_TAG(rxdp->Control_2));
+			else
+				vlan_hwaccel_rx(skb, sp->vlgrp,
+					RXD_GET_VLAN_TAG(rxdp->Control_2));
 		} else {
-			netif_rx(skb);
+			if (napi)
+				netif_receive_skb(skb);
+			else
+				netif_rx(skb);
 		}
-#endif
 	} else {
 send_up:
 		queue_rx_frame(skb);
@@ -6695,13 +6692,9 @@ static int s2io_verify_parm(struct pci_dev *pdev, u8 *dev_intr_type)
 		DBG_PRINT(ERR_DBG, "s2io: Default to 8 Rx rings\n");
 		rx_ring_num = 8;
 	}
-#ifdef CONFIG_S2IO_NAPI
-	if (*dev_intr_type != INTA) {
-		DBG_PRINT(ERR_DBG, "s2io: NAPI cannot be enabled when "
-			  "MSI/MSI-X is enabled. Defaulting to INTA\n");
-		*dev_intr_type = INTA;
-	}
-#endif
+	if (*dev_intr_type != INTA)
+		napi = 0;
+
 #ifndef CONFIG_PCI_MSI
 	if (*dev_intr_type != INTA) {
 		DBG_PRINT(ERR_DBG, "s2io: This kernel does not support"
@@ -6962,10 +6955,8 @@ 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
 	 */
-#if defined(CONFIG_S2IO_NAPI)
 	dev->poll = s2io_poll;
 	dev->weight = 32;
-#endif
 
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	dev->poll_controller = s2io_netpoll;
@@ -6976,7 +6967,7 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
 		dev->features |= NETIF_F_HIGHDMA;
 	dev->features |= NETIF_F_TSO;
 	dev->features |= NETIF_F_TSO6;
-	if (sp->device_type & XFRAME_II_DEVICE) {
+	if ((sp->device_type & XFRAME_II_DEVICE) && (ufo))  {
 		dev->features |= NETIF_F_UFO;
 		dev->features |= NETIF_F_HW_CSUM;
 	}
@@ -7057,9 +7048,9 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
 
 	/* Initialize spinlocks */
 	spin_lock_init(&sp->tx_lock);
-#ifndef CONFIG_S2IO_NAPI
-	spin_lock_init(&sp->put_lock);
-#endif
+
+	if (!napi)
+		spin_lock_init(&sp->put_lock);
 	spin_lock_init(&sp->rx_lock);
 
 	/*
@@ -7120,9 +7111,9 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
 						dev->name);
 		    break;
 	}
-#ifdef CONFIG_S2IO_NAPI
-	DBG_PRINT(ERR_DBG, "%s: NAPI enabled\n", dev->name);
-#endif
+
+	if (napi)
+		DBG_PRINT(ERR_DBG, "%s: NAPI enabled\n", dev->name);
 	switch(sp->intr_type) {
 		case INTA:
 		    DBG_PRINT(ERR_DBG, "%s: Interrupt type INTA\n", dev->name);
@@ -7137,7 +7128,9 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
 	if (sp->lro)
 		DBG_PRINT(ERR_DBG, "%s: Large receive offload enabled\n",
 			  dev->name);
-
+	if (ufo)
+		DBG_PRINT(ERR_DBG, "%s: UDP Fragmentation Offload(UFO)"
+					" enabled\n", dev->name);
 	/* Initialize device name */
 	sprintf(sp->name, "%s Neterion %s", dev->name, sp->product_name);
 
@@ -7539,11 +7532,10 @@ static void queue_rx_frame(struct sk_buff *skb)
 	struct net_device *dev = skb->dev;
 
 	skb->protocol = eth_type_trans(skb, dev);
-#ifdef CONFIG_S2IO_NAPI
-	netif_receive_skb(skb);
-#else
-	netif_rx(skb);
-#endif
+	if (napi)
+		netif_receive_skb(skb);
+	else
+		netif_rx(skb);
 }
 
 static void lro_append_pkt(nic_t *sp, lro_t *lro, struct sk_buff *skb,