S2io: Enable multi ring support

	- Seperate ring specific data
	- Initialize all configured rings with equal priority.
	- Updated boundary check for number of Rings.
	- Updated per ring statistics of rx_bytes and rx_packets.
	- Moved lro struct from struct s2io_nic to struct ring_info.
	- Access respective rx ring directly in fill_rx_buffers.
	- Moved rx_bufs_left struct s2io_nic to struct ring_info.
	- Added per ring variables -  rxd_mode, rxd_count, dev, pdev.
Signed-off-by: NSurjit Reang <surjit.reang@neterion.com>
Signed-off-by: NSreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: NRamkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

drivers/net/s2io.c

@@ -809,6 +809,7 @@ static int init_shared_mem(struct s2io_nic *nic)
 		    config->rx_cfg[i].num_rxd - 1;
 		mac_control->rings[i].nic = nic;
 		mac_control->rings[i].ring_no = i;
+		mac_control->rings[i].lro = lro_enable;
 
 		blk_cnt = config->rx_cfg[i].num_rxd /
 				(rxd_count[nic->rxd_mode] + 1);
@@ -1560,113 +1561,112 @@ static int init_nic(struct s2io_nic *nic)
 	writeq(val64, &bar0->tx_fifo_partition_0);
 
 	/* Filling the Rx round robin registers as per the
-	 * number of Rings and steering based on QoS.
-         */
+	 * number of Rings and steering based on QoS with
+	 * equal priority.
+	 */
 	switch (config->rx_ring_num) {
 	case 1:
+		val64 = 0x0;
+		writeq(val64, &bar0->rx_w_round_robin_0);
+		writeq(val64, &bar0->rx_w_round_robin_1);
+		writeq(val64, &bar0->rx_w_round_robin_2);
+		writeq(val64, &bar0->rx_w_round_robin_3);
+		writeq(val64, &bar0->rx_w_round_robin_4);
+
 		val64 = 0x8080808080808080ULL;
 		writeq(val64, &bar0->rts_qos_steering);
 		break;
 	case 2:
-		val64 = 0x0000010000010000ULL;
+		val64 = 0x0001000100010001ULL;
 		writeq(val64, &bar0->rx_w_round_robin_0);
-		val64 = 0x0100000100000100ULL;
 		writeq(val64, &bar0->rx_w_round_robin_1);
-		val64 = 0x0001000001000001ULL;
 		writeq(val64, &bar0->rx_w_round_robin_2);
-		val64 = 0x0000010000010000ULL;
 		writeq(val64, &bar0->rx_w_round_robin_3);
-		val64 = 0x0100000000000000ULL;
+		val64 = 0x0001000100000000ULL;
 		writeq(val64, &bar0->rx_w_round_robin_4);
 
 		val64 = 0x8080808040404040ULL;
 		writeq(val64, &bar0->rts_qos_steering);
 		break;
 	case 3:
-		val64 = 0x0001000102000001ULL;
+		val64 = 0x0001020001020001ULL;
 		writeq(val64, &bar0->rx_w_round_robin_0);
-		val64 = 0x0001020000010001ULL;
+		val64 = 0x0200010200010200ULL;
 		writeq(val64, &bar0->rx_w_round_robin_1);
-		val64 = 0x0200000100010200ULL;
+		val64 = 0x0102000102000102ULL;
 		writeq(val64, &bar0->rx_w_round_robin_2);
-		val64 = 0x0001000102000001ULL;
+		val64 = 0x0001020001020001ULL;
 		writeq(val64, &bar0->rx_w_round_robin_3);
-		val64 = 0x0001020000000000ULL;
+		val64 = 0x0200010200000000ULL;
 		writeq(val64, &bar0->rx_w_round_robin_4);
 
 		val64 = 0x8080804040402020ULL;
 		writeq(val64, &bar0->rts_qos_steering);
 		break;
 	case 4:
-		val64 = 0x0001020300010200ULL;
+		val64 = 0x0001020300010203ULL;
 		writeq(val64, &bar0->rx_w_round_robin_0);
-		val64 = 0x0100000102030001ULL;
 		writeq(val64, &bar0->rx_w_round_robin_1);
-		val64 = 0x0200010000010203ULL;
 		writeq(val64, &bar0->rx_w_round_robin_2);
-		val64 = 0x0001020001000001ULL;
 		writeq(val64, &bar0->rx_w_round_robin_3);
-		val64 = 0x0203000100000000ULL;
+		val64 = 0x0001020300000000ULL;
 		writeq(val64, &bar0->rx_w_round_robin_4);
 
 		val64 = 0x8080404020201010ULL;
 		writeq(val64, &bar0->rts_qos_steering);
 		break;
 	case 5:
-		val64 = 0x0001000203000102ULL;
+		val64 = 0x0001020304000102ULL;
 		writeq(val64, &bar0->rx_w_round_robin_0);
-		val64 = 0x0001020001030004ULL;
+		val64 = 0x0304000102030400ULL;
 		writeq(val64, &bar0->rx_w_round_robin_1);
-		val64 = 0x0001000203000102ULL;
+		val64 = 0x0102030400010203ULL;
 		writeq(val64, &bar0->rx_w_round_robin_2);
-		val64 = 0x0001020001030004ULL;
+		val64 = 0x0400010203040001ULL;
 		writeq(val64, &bar0->rx_w_round_robin_3);
-		val64 = 0x0001000000000000ULL;
+		val64 = 0x0203040000000000ULL;
 		writeq(val64, &bar0->rx_w_round_robin_4);
 
 		val64 = 0x8080404020201008ULL;
 		writeq(val64, &bar0->rts_qos_steering);
 		break;
 	case 6:
-		val64 = 0x0001020304000102ULL;
+		val64 = 0x0001020304050001ULL;
 		writeq(val64, &bar0->rx_w_round_robin_0);
-		val64 = 0x0304050001020001ULL;
+		val64 = 0x0203040500010203ULL;
 		writeq(val64, &bar0->rx_w_round_robin_1);
-		val64 = 0x0203000100000102ULL;
+		val64 = 0x0405000102030405ULL;
 		writeq(val64, &bar0->rx_w_round_robin_2);
-		val64 = 0x0304000102030405ULL;
+		val64 = 0x0001020304050001ULL;
 		writeq(val64, &bar0->rx_w_round_robin_3);
-		val64 = 0x0001000200000000ULL;
+		val64 = 0x0203040500000000ULL;
 		writeq(val64, &bar0->rx_w_round_robin_4);
 
 		val64 = 0x8080404020100804ULL;
 		writeq(val64, &bar0->rts_qos_steering);
 		break;
 	case 7:
-		val64 = 0x0001020001020300ULL;
+		val64 = 0x0001020304050600ULL;
 		writeq(val64, &bar0->rx_w_round_robin_0);
-		val64 = 0x0102030400010203ULL;
+		val64 = 0x0102030405060001ULL;
 		writeq(val64, &bar0->rx_w_round_robin_1);
-		val64 = 0x0405060001020001ULL;
+		val64 = 0x0203040506000102ULL;
 		writeq(val64, &bar0->rx_w_round_robin_2);
-		val64 = 0x0304050000010200ULL;
+		val64 = 0x0304050600010203ULL;
 		writeq(val64, &bar0->rx_w_round_robin_3);
-		val64 = 0x0102030000000000ULL;
+		val64 = 0x0405060000000000ULL;
 		writeq(val64, &bar0->rx_w_round_robin_4);
 
 		val64 = 0x8080402010080402ULL;
 		writeq(val64, &bar0->rts_qos_steering);
 		break;
 	case 8:
-		val64 = 0x0001020300040105ULL;
+		val64 = 0x0001020304050607ULL;
 		writeq(val64, &bar0->rx_w_round_robin_0);
-		val64 = 0x0200030106000204ULL;
 		writeq(val64, &bar0->rx_w_round_robin_1);
-		val64 = 0x0103000502010007ULL;
 		writeq(val64, &bar0->rx_w_round_robin_2);
-		val64 = 0x0304010002060500ULL;
 		writeq(val64, &bar0->rx_w_round_robin_3);
-		val64 = 0x0103020400000000ULL;
+		val64 = 0x0001020300000000ULL;
 		writeq(val64, &bar0->rx_w_round_robin_4);
 
 		val64 = 0x8040201008040201ULL;
@@ -2499,8 +2499,7 @@ static void stop_nic(struct s2io_nic *nic)
 
 /**
  *  fill_rx_buffers - Allocates the Rx side skbs
- *  @nic:  device private variable
- *  @ring_no: ring number
+ *  @ring_info: per ring structure
  *  Description:
  *  The function allocates Rx side skbs and puts the physical
  *  address of these buffers into the RxD buffer pointers, so that the NIC
@@ -2518,103 +2517,94 @@ static void stop_nic(struct s2io_nic *nic)
  *  SUCCESS on success or an appropriate -ve value on failure.
  */
 
-static int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
+static int fill_rx_buffers(struct ring_info *ring)
 {
-	struct net_device *dev = nic->dev;
 	struct sk_buff *skb;
 	struct RxD_t *rxdp;
-	int off, off1, size, block_no, block_no1;
+	int off, size, block_no, block_no1;
 	u32 alloc_tab = 0;
 	u32 alloc_cnt;
-	struct mac_info *mac_control;
-	struct config_param *config;
 	u64 tmp;
 	struct buffAdd *ba;
 	struct RxD_t *first_rxdp = NULL;
 	u64 Buffer0_ptr = 0, Buffer1_ptr = 0;
+	int rxd_index = 0;
 	struct RxD1 *rxdp1;
 	struct RxD3 *rxdp3;
-	struct swStat *stats = &nic->mac_control.stats_info->sw_stat;
+	struct swStat *stats = &ring->nic->mac_control.stats_info->sw_stat;
 
-	mac_control = &nic->mac_control;
-	config = &nic->config;
-	alloc_cnt = mac_control->rings[ring_no].pkt_cnt -
-	    atomic_read(&nic->rx_bufs_left[ring_no]);
+	alloc_cnt = ring->pkt_cnt - ring->rx_bufs_left;
 
-	block_no1 = mac_control->rings[ring_no].rx_curr_get_info.block_index;
-	off1 = mac_control->rings[ring_no].rx_curr_get_info.offset;
+	block_no1 = ring->rx_curr_get_info.block_index;
 	while (alloc_tab < alloc_cnt) {
-		block_no = mac_control->rings[ring_no].rx_curr_put_info.
-		    block_index;
-		off = mac_control->rings[ring_no].rx_curr_put_info.offset;
+		block_no = ring->rx_curr_put_info.block_index;
 
-		rxdp = mac_control->rings[ring_no].
-				rx_blocks[block_no].rxds[off].virt_addr;
+		off = ring->rx_curr_put_info.offset;
+
+		rxdp = ring->rx_blocks[block_no].rxds[off].virt_addr;
+
+		rxd_index = off + 1;
+		if (block_no)
+			rxd_index += (block_no * ring->rxd_count);
 
-		if ((block_no == block_no1) && (off == off1) &&
-					(rxdp->Host_Control)) {
+		if ((block_no == block_no1) && 
+			(off == ring->rx_curr_get_info.offset) &&
+			(rxdp->Host_Control)) {
 			DBG_PRINT(INTR_DBG, "%s: Get and Put",
-				  dev->name);
+				ring->dev->name);
 			DBG_PRINT(INTR_DBG, " info equated\n");
 			goto end;
 		}
-		if (off && (off == rxd_count[nic->rxd_mode])) {
-			mac_control->rings[ring_no].rx_curr_put_info.
-			    block_index++;
-			if (mac_control->rings[ring_no].rx_curr_put_info.
-			    block_index == mac_control->rings[ring_no].
-					block_count)
-				mac_control->rings[ring_no].rx_curr_put_info.
-					block_index = 0;
-			block_no = mac_control->rings[ring_no].
-					rx_curr_put_info.block_index;
-			if (off == rxd_count[nic->rxd_mode])
-				off = 0;
-			mac_control->rings[ring_no].rx_curr_put_info.
-				offset = off;
-			rxdp = mac_control->rings[ring_no].
-				rx_blocks[block_no].block_virt_addr;
+		if (off && (off == ring->rxd_count)) {
+			ring->rx_curr_put_info.block_index++;
+			if (ring->rx_curr_put_info.block_index ==
+							ring->block_count)
+				ring->rx_curr_put_info.block_index = 0;
+			block_no = ring->rx_curr_put_info.block_index;
+			off = 0;
+			ring->rx_curr_put_info.offset = off;
+			rxdp = ring->rx_blocks[block_no].block_virt_addr;
 			DBG_PRINT(INTR_DBG, "%s: Next block at: %p\n",
-				  dev->name, rxdp);
+				  ring->dev->name, rxdp);
+
 		}
 
 		if ((rxdp->Control_1 & RXD_OWN_XENA) &&
-			((nic->rxd_mode == RXD_MODE_3B) &&
+			((ring->rxd_mode == RXD_MODE_3B) &&
 				(rxdp->Control_2 & s2BIT(0)))) {
-			mac_control->rings[ring_no].rx_curr_put_info.
-					offset = off;
+			ring->rx_curr_put_info.offset = off;
 			goto end;
 		}
 		/* calculate size of skb based on ring mode */
-		size = dev->mtu + HEADER_ETHERNET_II_802_3_SIZE +
+		size = ring->mtu + HEADER_ETHERNET_II_802_3_SIZE +
 				HEADER_802_2_SIZE + HEADER_SNAP_SIZE;
-		if (nic->rxd_mode == RXD_MODE_1)
+		if (ring->rxd_mode == RXD_MODE_1)
 			size += NET_IP_ALIGN;
 		else
-			size = dev->mtu + ALIGN_SIZE + BUF0_LEN + 4;
+			size = ring->mtu + ALIGN_SIZE + BUF0_LEN + 4;
 
 		/* allocate skb */
 		skb = dev_alloc_skb(size);
 		if(!skb) {
-			DBG_PRINT(INFO_DBG, "%s: Out of ", dev->name);
+			DBG_PRINT(INFO_DBG, "%s: Out of ", ring->dev->name);
 			DBG_PRINT(INFO_DBG, "memory to allocate SKBs\n");
 			if (first_rxdp) {
 				wmb();
 				first_rxdp->Control_1 |= RXD_OWN_XENA;
 			}
-			nic->mac_control.stats_info->sw_stat. \
-				mem_alloc_fail_cnt++;
+			stats->mem_alloc_fail_cnt++;
+				
 			return -ENOMEM ;
 		}
-		nic->mac_control.stats_info->sw_stat.mem_allocated
-			+= skb->truesize;
-		if (nic->rxd_mode == RXD_MODE_1) {
+		stats->mem_allocated += skb->truesize;
+
+		if (ring->rxd_mode == RXD_MODE_1) {
 			/* 1 buffer mode - normal operation mode */
 			rxdp1 = (struct RxD1*)rxdp;
 			memset(rxdp, 0, sizeof(struct RxD1));
 			skb_reserve(skb, NET_IP_ALIGN);
 			rxdp1->Buffer0_ptr = pci_map_single
-			    (nic->pdev, skb->data, size - NET_IP_ALIGN,
+			    (ring->pdev, skb->data, size - NET_IP_ALIGN,
 				PCI_DMA_FROMDEVICE);
 			if( (rxdp1->Buffer0_ptr == 0) ||
 				(rxdp1->Buffer0_ptr ==
@@ -2623,8 +2613,8 @@ static int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
 
 			rxdp->Control_2 =
 				SET_BUFFER0_SIZE_1(size - NET_IP_ALIGN);
-
-		} else if (nic->rxd_mode == RXD_MODE_3B) {
+			rxdp->Host_Control = (unsigned long) (skb);
+		} else if (ring->rxd_mode == RXD_MODE_3B) {
 			/*
 			 * 2 buffer mode -
 			 * 2 buffer mode provides 128
@@ -2640,7 +2630,7 @@ static int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
 			rxdp3->Buffer0_ptr = Buffer0_ptr;
 			rxdp3->Buffer1_ptr = Buffer1_ptr;
 
-			ba = &mac_control->rings[ring_no].ba[block_no][off];
+			ba = &ring->ba[block_no][off];
 			skb_reserve(skb, BUF0_LEN);
 			tmp = (u64)(unsigned long) skb->data;
 			tmp += ALIGN_SIZE;
@@ -2650,10 +2640,10 @@ static int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
 
 			if (!(rxdp3->Buffer0_ptr))
 				rxdp3->Buffer0_ptr =
-				   pci_map_single(nic->pdev, ba->ba_0, BUF0_LEN,
-					   PCI_DMA_FROMDEVICE);
+				   pci_map_single(ring->pdev, ba->ba_0,
+					BUF0_LEN, PCI_DMA_FROMDEVICE);
 			else
-				pci_dma_sync_single_for_device(nic->pdev,
+				pci_dma_sync_single_for_device(ring->pdev,
 				(dma_addr_t) rxdp3->Buffer0_ptr,
 				    BUF0_LEN, PCI_DMA_FROMDEVICE);
 			if( (rxdp3->Buffer0_ptr == 0) ||
@@ -2661,7 +2651,7 @@ static int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
 				goto pci_map_failed;
 
 			rxdp->Control_2 = SET_BUFFER0_SIZE_3(BUF0_LEN);
-			if (nic->rxd_mode == RXD_MODE_3B) {
+			if (ring->rxd_mode == RXD_MODE_3B) {
 				/* Two buffer mode */
 
 				/*
@@ -2669,39 +2659,42 @@ static int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
 				 * L4 payload
 				 */
 				rxdp3->Buffer2_ptr = pci_map_single
-				(nic->pdev, skb->data, dev->mtu + 4,
+				(ring->pdev, skb->data, ring->mtu + 4,
 						PCI_DMA_FROMDEVICE);
 
 				if( (rxdp3->Buffer2_ptr == 0) ||
 					(rxdp3->Buffer2_ptr == DMA_ERROR_CODE))
 					goto pci_map_failed;
 
-				rxdp3->Buffer1_ptr =
-						pci_map_single(nic->pdev,
+				if (!rxdp3->Buffer1_ptr)
+					rxdp3->Buffer1_ptr =
+						pci_map_single(ring->pdev,
 						ba->ba_1, BUF1_LEN,
 						PCI_DMA_FROMDEVICE);
+
 				if( (rxdp3->Buffer1_ptr == 0) ||
 					(rxdp3->Buffer1_ptr == DMA_ERROR_CODE)) {
 					pci_unmap_single
-						(nic->pdev,
-						(dma_addr_t)rxdp3->Buffer2_ptr,
-						dev->mtu + 4,
+						(ring->pdev,
+						(dma_addr_t)(unsigned long)
+						skb->data,
+						ring->mtu + 4,
 						PCI_DMA_FROMDEVICE);
 					goto pci_map_failed;
 				}
 				rxdp->Control_2 |= SET_BUFFER1_SIZE_3(1);
 				rxdp->Control_2 |= SET_BUFFER2_SIZE_3
-								(dev->mtu + 4);
+								(ring->mtu + 4);
 			}
 			rxdp->Control_2 |= s2BIT(0);
+			rxdp->Host_Control = (unsigned long) (skb);
 		}
-		rxdp->Host_Control = (unsigned long) (skb);
 		if (alloc_tab & ((1 << rxsync_frequency) - 1))
 			rxdp->Control_1 |= RXD_OWN_XENA;
 		off++;
-		if (off == (rxd_count[nic->rxd_mode] + 1))
+		if (off == (ring->rxd_count + 1))
 			off = 0;
-		mac_control->rings[ring_no].rx_curr_put_info.offset = off;
+		ring->rx_curr_put_info.offset = off;
 
 		rxdp->Control_2 |= SET_RXD_MARKER;
 		if (!(alloc_tab & ((1 << rxsync_frequency) - 1))) {
@@ -2711,7 +2704,7 @@ static int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
 			}
 			first_rxdp = rxdp;
 		}
-		atomic_inc(&nic->rx_bufs_left[ring_no]);
+		ring->rx_bufs_left += 1;
 		alloc_tab++;
 	}
 
@@ -2783,7 +2776,7 @@ static void free_rxd_blk(struct s2io_nic *sp, int ring_no, int blk)
 		}
 		sp->mac_control.stats_info->sw_stat.mem_freed += skb->truesize;
 		dev_kfree_skb(skb);
-		atomic_dec(&sp->rx_bufs_left[ring_no]);
+		mac_control->rings[ring_no].rx_bufs_left -= 1;
 	}
 }
 
@@ -2814,7 +2807,7 @@ static void free_rx_buffers(struct s2io_nic *sp)
 		mac_control->rings[i].rx_curr_get_info.block_index = 0;
 		mac_control->rings[i].rx_curr_put_info.offset = 0;
 		mac_control->rings[i].rx_curr_get_info.offset = 0;
-		atomic_set(&sp->rx_bufs_left[i], 0);
+		mac_control->rings[i].rx_bufs_left = 0;
 		DBG_PRINT(INIT_DBG, "%s:Freed 0x%x Rx Buffers on ring%d\n",
 			  dev->name, buf_cnt, i);
 	}
@@ -2864,7 +2857,7 @@ static int s2io_poll(struct napi_struct *napi, int budget)
 	netif_rx_complete(dev, napi);
 
 	for (i = 0; i < config->rx_ring_num; i++) {
-		if (fill_rx_buffers(nic, i) == -ENOMEM) {
+		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;
@@ -2877,7 +2870,7 @@ static int s2io_poll(struct napi_struct *napi, int budget)
 
 no_rx:
 	for (i = 0; i < config->rx_ring_num; i++) {
-		if (fill_rx_buffers(nic, i) == -ENOMEM) {
+		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;
@@ -2928,7 +2921,7 @@ static void s2io_netpoll(struct net_device *dev)
 		rx_intr_handler(&mac_control->rings[i]);
 
 	for (i = 0; i < config->rx_ring_num; i++) {
-		if (fill_rx_buffers(nic, i) == -ENOMEM) {
+		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 Netpoll!!\n");
 			break;
@@ -2953,8 +2946,6 @@ static void s2io_netpoll(struct net_device *dev)
  */
 static void rx_intr_handler(struct ring_info *ring_data)
 {
-	struct s2io_nic *nic = ring_data->nic;
-	struct net_device *dev = (struct net_device *) nic->dev;
 	int get_block, put_block;
 	struct rx_curr_get_info get_info, put_info;
 	struct RxD_t *rxdp;
@@ -2977,33 +2968,34 @@ static void rx_intr_handler(struct ring_info *ring_data)
 		 */
 		if ((get_block == put_block) &&
 		    (get_info.offset + 1) == put_info.offset) {
-			DBG_PRINT(INTR_DBG, "%s: Ring Full\n",dev->name);
+			DBG_PRINT(INTR_DBG, "%s: Ring Full\n",
+				ring_data->dev->name);
 			break;
 		}
 		skb = (struct sk_buff *) ((unsigned long)rxdp->Host_Control);
 		if (skb == NULL) {
 			DBG_PRINT(ERR_DBG, "%s: The skb is ",
-				  dev->name);
+				  ring_data->dev->name);
 			DBG_PRINT(ERR_DBG, "Null in Rx Intr\n");
 			return;
 		}
-		if (nic->rxd_mode == RXD_MODE_1) {
+		if (ring_data->rxd_mode == RXD_MODE_1) {
 			rxdp1 = (struct RxD1*)rxdp;
-			pci_unmap_single(nic->pdev, (dma_addr_t)
+			pci_unmap_single(ring_data->pdev, (dma_addr_t)
 				rxdp1->Buffer0_ptr,
-				dev->mtu +
+				ring_data->mtu +
 				HEADER_ETHERNET_II_802_3_SIZE +
 				HEADER_802_2_SIZE +
 				HEADER_SNAP_SIZE,
 				PCI_DMA_FROMDEVICE);
-		} else if (nic->rxd_mode == RXD_MODE_3B) {
+		} else if (ring_data->rxd_mode == RXD_MODE_3B) {
 			rxdp3 = (struct RxD3*)rxdp;
-			pci_dma_sync_single_for_cpu(nic->pdev, (dma_addr_t)
+			pci_dma_sync_single_for_cpu(ring_data->pdev, (dma_addr_t)
 				rxdp3->Buffer0_ptr,
 				BUF0_LEN, PCI_DMA_FROMDEVICE);
-			pci_unmap_single(nic->pdev, (dma_addr_t)
+			pci_unmap_single(ring_data->pdev, (dma_addr_t)
 				rxdp3->Buffer2_ptr,
-				dev->mtu + 4,
+				ring_data->mtu + 4,
 				PCI_DMA_FROMDEVICE);
 		}
 		prefetch(skb->data);
@@ -3012,7 +3004,7 @@ static void rx_intr_handler(struct ring_info *ring_data)
 		ring_data->rx_curr_get_info.offset = get_info.offset;
 		rxdp = ring_data->rx_blocks[get_block].
 				rxds[get_info.offset].virt_addr;
-		if (get_info.offset == rxd_count[nic->rxd_mode]) {
+		if (get_info.offset == rxd_count[ring_data->rxd_mode]) {
 			get_info.offset = 0;
 			ring_data->rx_curr_get_info.offset = get_info.offset;
 			get_block++;
@@ -3022,19 +3014,21 @@ static void rx_intr_handler(struct ring_info *ring_data)
 			rxdp = ring_data->rx_blocks[get_block].block_virt_addr;
 		}
 
-		nic->pkts_to_process -= 1;
-		if ((napi) && (!nic->pkts_to_process))
-			break;
+		if(ring_data->nic->config.napi){
+			ring_data->nic->pkts_to_process -= 1;
+			if (!ring_data->nic->pkts_to_process)
+				break;
+		}
 		pkt_cnt++;
 		if ((indicate_max_pkts) && (pkt_cnt > indicate_max_pkts))
 			break;
 	}
-	if (nic->lro) {
+	if (ring_data->lro) {
 		/* Clear all LRO sessions before exiting */
 		for (i=0; i<MAX_LRO_SESSIONS; i++) {
-			struct lro *lro = &nic->lro0_n[i];
+			struct lro *lro = &ring_data->lro0_n[i];
 			if (lro->in_use) {
-				update_L3L4_header(nic, lro);
+				update_L3L4_header(ring_data->nic, lro);
 				queue_rx_frame(lro->parent, lro->vlan_tag);
 				clear_lro_session(lro);
 			}
@@ -4333,10 +4327,10 @@ s2io_alarm_handle(unsigned long data)
 	mod_timer(&sp->alarm_timer, jiffies + HZ / 2);
 }
 
-static int s2io_chk_rx_buffers(struct s2io_nic *sp, int rng_n)
+static int s2io_chk_rx_buffers(struct ring_info *ring)
 {
-	if (fill_rx_buffers(sp, rng_n) == -ENOMEM) {
-		DBG_PRINT(INFO_DBG, "%s:Out of memory", sp->dev->name);
+	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;
@@ -4351,7 +4345,7 @@ static irqreturn_t s2io_msix_ring_handle(int irq, void *dev_id)
 		return IRQ_HANDLED;
 
 	rx_intr_handler(ring);
-	s2io_chk_rx_buffers(sp, ring->ring_no);
+	s2io_chk_rx_buffers(ring);
 
 	return IRQ_HANDLED;
 }
@@ -4809,7 +4803,7 @@ static irqreturn_t s2io_isr(int irq, void *dev_id)
 		 */
 		if (!config->napi) {
 			for (i = 0; i < config->rx_ring_num; i++)
-				s2io_chk_rx_buffers(sp, i);
+				s2io_chk_rx_buffers(&mac_control->rings[i]);
 		}
 		writeq(sp->general_int_mask, &bar0->general_int_mask);
 		readl(&bar0->general_int_status);
@@ -4866,6 +4860,7 @@ static struct net_device_stats *s2io_get_stats(struct net_device *dev)
 	struct s2io_nic *sp = dev->priv;
 	struct mac_info *mac_control;
 	struct config_param *config;
+	int i;
 
 
 	mac_control = &sp->mac_control;
@@ -4885,6 +4880,13 @@ static struct net_device_stats *s2io_get_stats(struct net_device *dev)
 	sp->stats.rx_length_errors =
 		le64_to_cpu(mac_control->stats_info->rmac_long_frms);
 
+	/* collect per-ring rx_packets and rx_bytes */
+	sp->stats.rx_packets = sp->stats.rx_bytes = 0;
+	for (i = 0; i < config->rx_ring_num; i++) {
+		sp->stats.rx_packets += mac_control->rings[i].rx_packets;
+		sp->stats.rx_bytes += mac_control->rings[i].rx_bytes;
+	}
+
 	return (&sp->stats);
 }
 
@@ -7157,7 +7159,9 @@ static int s2io_card_up(struct s2io_nic * sp)
 	config = &sp->config;
 
 	for (i = 0; i < config->rx_ring_num; i++) {
-		if ((ret = fill_rx_buffers(sp, i))) {
+		mac_control->rings[i].mtu = dev->mtu;
+		ret = fill_rx_buffers(&mac_control->rings[i]);
+		if (ret) {
 			DBG_PRINT(ERR_DBG, "%s: Out of memory in Open\n",
 				  dev->name);
 			s2io_reset(sp);
@@ -7165,7 +7169,7 @@ static int s2io_card_up(struct s2io_nic * sp)
 			return -ENOMEM;
 		}
 		DBG_PRINT(INFO_DBG, "Buf in ring:%d is %d:\n", i,
-			  atomic_read(&sp->rx_bufs_left[i]));
+			  mac_control->rings[i].rx_bufs_left);
 	}
 
 	/* Initialise napi */
@@ -7300,7 +7304,7 @@ static void s2io_tx_watchdog(struct net_device *dev)
 static int rx_osm_handler(struct ring_info *ring_data, struct RxD_t * rxdp)
 {
 	struct s2io_nic *sp = ring_data->nic;
-	struct net_device *dev = (struct net_device *) sp->dev;
+	struct net_device *dev = (struct net_device *) ring_data->dev;
 	struct sk_buff *skb = (struct sk_buff *)
 		((unsigned long) rxdp->Host_Control);
 	int ring_no = ring_data->ring_no;
@@ -7377,19 +7381,19 @@ static int rx_osm_handler(struct ring_info *ring_data, struct RxD_t * rxdp)
 			sp->mac_control.stats_info->sw_stat.mem_freed
 				+= skb->truesize;
 			dev_kfree_skb(skb);
-			atomic_dec(&sp->rx_bufs_left[ring_no]);
+			ring_data->rx_bufs_left -= 1;
 			rxdp->Host_Control = 0;
 			return 0;
 		}
 	}
 
 	/* Updating statistics */
-	sp->stats.rx_packets++;
+	ring_data->rx_packets++;
 	rxdp->Host_Control = 0;
 	if (sp->rxd_mode == RXD_MODE_1) {
 		int len = RXD_GET_BUFFER0_SIZE_1(rxdp->Control_2);
 
-		sp->stats.rx_bytes += len;
+		ring_data->rx_bytes += len;
 		skb_put(skb, len);
 
 	} else if (sp->rxd_mode == RXD_MODE_3B) {
@@ -7400,13 +7404,13 @@ static int rx_osm_handler(struct ring_info *ring_data, struct RxD_t * rxdp)
 		unsigned char *buff = skb_push(skb, buf0_len);
 
 		struct buffAdd *ba = &ring_data->ba[get_block][get_off];
-		sp->stats.rx_bytes += buf0_len + buf2_len;
+		ring_data->rx_bytes += buf0_len + buf2_len;
 		memcpy(buff, ba->ba_0, buf0_len);
 		skb_put(skb, buf2_len);
 	}
 
-	if ((rxdp->Control_1 & TCP_OR_UDP_FRAME) && ((!sp->lro) ||
-	    (sp->lro && (!(rxdp->Control_1 & RXD_FRAME_IP_FRAG)))) &&
+	if ((rxdp->Control_1 & TCP_OR_UDP_FRAME) && ((!ring_data->lro) ||
+	    (ring_data->lro && (!(rxdp->Control_1 & RXD_FRAME_IP_FRAG)))) &&
 	    (sp->rx_csum)) {
 		l3_csum = RXD_GET_L3_CKSUM(rxdp->Control_1);
 		l4_csum = RXD_GET_L4_CKSUM(rxdp->Control_1);
@@ -7417,14 +7421,14 @@ static int rx_osm_handler(struct ring_info *ring_data, struct RxD_t * rxdp)
 			 * a flag in the RxD.
 			 */
 			skb->ip_summed = CHECKSUM_UNNECESSARY;
-			if (sp->lro) {
+			if (ring_data->lro) {
 				u32 tcp_len;
 				u8 *tcp;
 				int ret = 0;
 
-				ret = s2io_club_tcp_session(skb->data, &tcp,
-							    &tcp_len, &lro,
-							    rxdp, sp);
+				ret = s2io_club_tcp_session(ring_data,
+					skb->data, &tcp, &tcp_len, &lro,
+					rxdp, sp);
 				switch (ret) {
 					case 3: /* Begin anew */
 						lro->parent = skb;
@@ -7486,7 +7490,7 @@ static int rx_osm_handler(struct ring_info *ring_data, struct RxD_t * rxdp)
 	queue_rx_frame(skb, RXD_GET_VLAN_TAG(rxdp->Control_2));
 	dev->last_rx = jiffies;
 aggregate:
-	atomic_dec(&sp->rx_bufs_left[ring_no]);
+	sp->mac_control.rings[ring_no].rx_bufs_left -= 1;
 	return SUCCESS;
 }
 
@@ -7603,12 +7607,14 @@ static int s2io_verify_parm(struct pci_dev *pdev, u8 *dev_intr_type,
 		tx_steering_type = NO_STEERING;
 	}
 
-	if ( rx_ring_num > 8) {
-		DBG_PRINT(ERR_DBG, "s2io: Requested number of Rx rings not "
+	if (rx_ring_num > MAX_RX_RINGS) {
+		DBG_PRINT(ERR_DBG, "s2io: Requested number of rx rings not "
 			 "supported\n");
-		DBG_PRINT(ERR_DBG, "s2io: Default to 8 Rx rings\n");
-		rx_ring_num = 8;
+		DBG_PRINT(ERR_DBG, "s2io: Default to %d rx rings\n",
+			MAX_RX_RINGS);
+		rx_ring_num = MAX_RX_RINGS;
 	}
+
 	if (*dev_intr_type != INTA)
 		napi = 0;
 
@@ -7836,10 +7842,15 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
 
 	/* Rx side parameters. */
 	config->rx_ring_num = rx_ring_num;
-	for (i = 0; i < MAX_RX_RINGS; i++) {
+	for (i = 0; i < config->rx_ring_num; i++) {
 		config->rx_cfg[i].num_rxd = rx_ring_sz[i] *
 		    (rxd_count[sp->rxd_mode] + 1);
 		config->rx_cfg[i].ring_priority = i;
+		mac_control->rings[i].rx_bufs_left = 0;
+		mac_control->rings[i].rxd_mode = sp->rxd_mode;
+		mac_control->rings[i].rxd_count = rxd_count[sp->rxd_mode];
+		mac_control->rings[i].pdev = sp->pdev;
+		mac_control->rings[i].dev = sp->dev;
 	}
 
 	for (i = 0; i < rx_ring_num; i++) {
@@ -7854,10 +7865,6 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
 	mac_control->mc_pause_threshold_q4q7 = mc_pause_threshold_q4q7;
 
 
-	/* Initialize Ring buffer parameters. */
-	for (i = 0; i < config->rx_ring_num; i++)
-		atomic_set(&sp->rx_bufs_left[i], 0);
-
 	/*  initialize the shared memory used by the NIC and the host */
 	if (init_shared_mem(sp)) {
 		DBG_PRINT(ERR_DBG, "%s: Memory allocation failed\n",
@@ -8077,6 +8084,9 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
 	DBG_PRINT(ERR_DBG, "%s: Using %d Tx fifo(s)\n", dev->name,
 		sp->config.tx_fifo_num);
 
+	DBG_PRINT(ERR_DBG, "%s: Using %d Rx ring(s)\n", dev->name,
+		  sp->config.rx_ring_num);
+
 	switch(sp->config.intr_type) {
 		case INTA:
 		    DBG_PRINT(ERR_DBG, "%s: Interrupt type INTA\n", dev->name);
@@ -8391,8 +8401,9 @@ static int verify_l3_l4_lro_capable(struct lro *l_lro, struct iphdr *ip,
 }
 
 static int
-s2io_club_tcp_session(u8 *buffer, u8 **tcp, u32 *tcp_len, struct lro **lro,
-		      struct RxD_t *rxdp, struct s2io_nic *sp)
+s2io_club_tcp_session(struct ring_info *ring_data, u8 *buffer, u8 **tcp,
+	u32 *tcp_len, struct lro **lro, struct RxD_t *rxdp,
+	struct s2io_nic *sp)
 {
 	struct iphdr *ip;
 	struct tcphdr *tcph;
@@ -8410,7 +8421,7 @@ s2io_club_tcp_session(u8 *buffer, u8 **tcp, u32 *tcp_len, struct lro **lro,
 	tcph = (struct tcphdr *)*tcp;
 	*tcp_len = get_l4_pyld_length(ip, tcph);
 	for (i=0; i<MAX_LRO_SESSIONS; i++) {
-		struct lro *l_lro = &sp->lro0_n[i];
+		struct lro *l_lro = &ring_data->lro0_n[i];
 		if (l_lro->in_use) {
 			if (check_for_socket_match(l_lro, ip, tcph))
 				continue;
@@ -8448,7 +8459,7 @@ s2io_club_tcp_session(u8 *buffer, u8 **tcp, u32 *tcp_len, struct lro **lro,
 		}
 
 		for (i=0; i<MAX_LRO_SESSIONS; i++) {
-			struct lro *l_lro = &sp->lro0_n[i];
+			struct lro *l_lro = &ring_data->lro0_n[i];
 			if (!(l_lro->in_use)) {
 				*lro = l_lro;
 				ret = 3; /* Begin anew */

drivers/net/s2io.h

@@ -678,11 +678,53 @@ struct rx_block_info {
 	struct rxd_info *rxds;
 };
 
+/* Data structure to represent a LRO session */
+struct lro {
+	struct sk_buff	*parent;
+	struct sk_buff  *last_frag;
+	u8		*l2h;
+	struct iphdr	*iph;
+	struct tcphdr	*tcph;
+	u32		tcp_next_seq;
+	__be32		tcp_ack;
+	int		total_len;
+	int		frags_len;
+	int		sg_num;
+	int		in_use;
+	__be16		window;
+	u16             vlan_tag;
+	u32		cur_tsval;
+	__be32		cur_tsecr;
+	u8		saw_ts;
+} ____cacheline_aligned;
+
 /* Ring specific structure */
 struct ring_info {
 	/* The ring number */
 	int ring_no;
 
+	/* per-ring buffer counter */
+	u32 rx_bufs_left;
+
+	#define MAX_LRO_SESSIONS	32
+	struct lro lro0_n[MAX_LRO_SESSIONS];
+	u8		lro;
+
+	/* copy of sp->rxd_mode flag */
+	int rxd_mode;
+
+	/* Number of rxds per block for the rxd_mode */
+	int rxd_count;
+
+	/* copy of sp pointer */
+	struct s2io_nic *nic;
+
+	/* copy of sp->dev pointer */
+	struct net_device *dev;
+
+	/* copy of sp->pdev pointer */
+	struct pci_dev *pdev;
+
 	/*
 	 *  Place holders for the virtual and physical addresses of
 	 *  all the Rx Blocks
@@ -703,10 +745,16 @@ struct ring_info {
 	 */
 	struct rx_curr_get_info rx_curr_get_info;
 
+	/* interface MTU value */
+        unsigned mtu;
+    
 	/* Buffer Address store. */
 	struct buffAdd **ba;
-	struct s2io_nic *nic;
-};
+
+	/* per-Ring statistics */
+	unsigned long rx_packets;
+	unsigned long rx_bytes;
+} ____cacheline_aligned;
 
 /* Fifo specific structure */
 struct fifo_info {
@@ -813,26 +861,6 @@ struct msix_info_st {
 	u64 data;
 };
 
-/* Data structure to represent a LRO session */
-struct lro {
-	struct sk_buff	*parent;
-	struct sk_buff  *last_frag;
-	u8		*l2h;
-	struct iphdr	*iph;
-	struct tcphdr	*tcph;
-	u32		tcp_next_seq;
-	__be32		tcp_ack;
-	int		total_len;
-	int		frags_len;
-	int		sg_num;
-	int		in_use;
-	__be16		window;
-	u16             vlan_tag;
-	u32		cur_tsval;
-	__be32		cur_tsecr;
-	u8		saw_ts;
-} ____cacheline_aligned;
-
 /* These flags represent the devices temporary state */
 enum s2io_device_state_t
 {
@@ -872,8 +900,6 @@ struct s2io_nic {
 	/* Space to back up the PCI config space */
 	u32 config_space[256 / sizeof(u32)];
 
-	atomic_t rx_bufs_left[MAX_RX_RINGS];
-
 #define PROMISC     1
 #define ALL_MULTI   2
 
@@ -950,8 +976,6 @@ struct s2io_nic {
 #define XFRAME_II_DEVICE	2
 	u8 device_type;
 
-#define MAX_LRO_SESSIONS	32
-	struct lro lro0_n[MAX_LRO_SESSIONS];
 	unsigned long	clubbed_frms_cnt;
 	unsigned long	sending_both;
 	u8		lro;
@@ -1118,9 +1142,9 @@ static int do_s2io_add_mc(struct s2io_nic *sp, u8 *addr);
 static int do_s2io_add_mac(struct s2io_nic *sp, u64 addr, int offset);
 static int do_s2io_delete_unicast_mc(struct s2io_nic *sp, u64 addr);
 
-static int
-s2io_club_tcp_session(u8 *buffer, u8 **tcp, u32 *tcp_len, struct lro **lro,
-		      struct RxD_t *rxdp, struct s2io_nic *sp);
+static int s2io_club_tcp_session(struct ring_info *ring_data, u8 *buffer,
+	u8 **tcp, u32 *tcp_len, struct lro **lro, struct RxD_t *rxdp,
+	struct s2io_nic *sp);
 static void clear_lro_session(struct lro *lro);
 static void queue_rx_frame(struct sk_buff *skb, u16 vlan_tag);
 static void update_L3L4_header(struct s2io_nic *sp, struct lro *lro);