igc: Add support for Tx/Rx rings

This change adds the defines and structures necessary to support both Tx
and Rx descriptor rings.

Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

8 files changed, 1172 insertions, 1 deletions

diff --git a/drivers/net/ethernet/intel/igc/Makefile b/drivers/net/ethernet/intel/igc/Makefile
index 06e0b9e23a8c..c32c45300692 100644
--- a/drivers/net/ethernet/intel/igc/Makefile
+++ b/drivers/net/ethernet/intel/igc/Makefile
@@ -7,4 +7,4 @@
 
 obj-$(CONFIG_IGC) += igc.o
 
-igc-objs := igc_main.o igc_mac.o
+igc-objs := igc_main.o igc_mac.o igc_base.o
diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h
index e595d135ea7b..7bb19328b899 100644
--- a/drivers/net/ethernet/intel/igc/igc.h
+++ b/drivers/net/ethernet/intel/igc/igc.h
@@ -46,6 +46,45 @@ extern char igc_driver_version[];
 #define MAX_Q_VECTORS			8
 #define MAX_STD_JUMBO_FRAME_SIZE	9216
 
+/* Supported Rx Buffer Sizes */
+#define IGC_RXBUFFER_256		256
+#define IGC_RXBUFFER_2048		2048
+#define IGC_RXBUFFER_3072		3072
+
+#define IGC_RX_HDR_LEN			IGC_RXBUFFER_256
+
+/* RX and TX descriptor control thresholds.
+ * PTHRESH - MAC will consider prefetch if it has fewer than this number of
+ *           descriptors available in its onboard memory.
+ *           Setting this to 0 disables RX descriptor prefetch.
+ * HTHRESH - MAC will only prefetch if there are at least this many descriptors
+ *           available in host memory.
+ *           If PTHRESH is 0, this should also be 0.
+ * WTHRESH - RX descriptor writeback threshold - MAC will delay writing back
+ *           descriptors until either it has this many to write back, or the
+ *           ITR timer expires.
+ */
+#define IGC_RX_PTHRESH			8
+#define IGC_RX_HTHRESH			8
+#define IGC_TX_PTHRESH			8
+#define IGC_TX_HTHRESH			1
+#define IGC_RX_WTHRESH			4
+#define IGC_TX_WTHRESH			16
+
+#define IGC_RX_DMA_ATTR \
+	(DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_WEAK_ORDERING)
+
+#define IGC_TS_HDR_LEN			16
+
+#define IGC_SKB_PAD			(NET_SKB_PAD + NET_IP_ALIGN)
+
+#if (PAGE_SIZE < 8192)
+#define IGC_MAX_FRAME_BUILD_SKB \
+	(SKB_WITH_OVERHEAD(IGC_RXBUFFER_2048) - IGC_SKB_PAD - IGC_TS_HDR_LEN)
+#else
+#define IGC_MAX_FRAME_BUILD_SKB (IGC_RXBUFFER_2048 - IGC_TS_HDR_LEN)
+#endif
+
 enum igc_state_t {
 	__IGC_TESTING,
 	__IGC_RESETTING,
@@ -53,6 +92,33 @@ enum igc_state_t {
 	__IGC_PTP_TX_IN_PROGRESS,
 };
 
+/* wrapper around a pointer to a socket buffer,
+ * so a DMA handle can be stored along with the buffer
+ */
+struct igc_tx_buffer {
+	union igc_adv_tx_desc *next_to_watch;
+	unsigned long time_stamp;
+	struct sk_buff *skb;
+	unsigned int bytecount;
+	u16 gso_segs;
+	__be16 protocol;
+
+	DEFINE_DMA_UNMAP_ADDR(dma);
+	DEFINE_DMA_UNMAP_LEN(len);
+	u32 tx_flags;
+};
+
+struct igc_rx_buffer {
+	dma_addr_t dma;
+	struct page *page;
+#if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536)
+	__u32 page_offset;
+#else
+	__u16 page_offset;
+#endif
+	__u16 pagecnt_bias;
+};
+
 struct igc_tx_queue_stats {
 	u64 packets;
 	u64 bytes;
@@ -214,4 +280,63 @@ struct igc_adapter {
 	struct igc_mac_addr *mac_table;
 };
 
+/* igc_desc_unused - calculate if we have unused descriptors */
+static inline u16 igc_desc_unused(const struct igc_ring *ring)
+{
+	u16 ntc = ring->next_to_clean;
+	u16 ntu = ring->next_to_use;
+
+	return ((ntc > ntu) ? 0 : ring->count) + ntc - ntu - 1;
+}
+
+static inline struct netdev_queue *txring_txq(const struct igc_ring *tx_ring)
+{
+	return netdev_get_tx_queue(tx_ring->netdev, tx_ring->queue_index);
+}
+
+enum igc_ring_flags_t {
+	IGC_RING_FLAG_RX_3K_BUFFER,
+	IGC_RING_FLAG_RX_BUILD_SKB_ENABLED,
+	IGC_RING_FLAG_RX_SCTP_CSUM,
+	IGC_RING_FLAG_RX_LB_VLAN_BSWAP,
+	IGC_RING_FLAG_TX_CTX_IDX,
+	IGC_RING_FLAG_TX_DETECT_HANG
+};
+
+#define ring_uses_large_buffer(ring) \
+	test_bit(IGC_RING_FLAG_RX_3K_BUFFER, &(ring)->flags)
+
+#define ring_uses_build_skb(ring) \
+	test_bit(IGC_RING_FLAG_RX_BUILD_SKB_ENABLED, &(ring)->flags)
+
+static inline unsigned int igc_rx_bufsz(struct igc_ring *ring)
+{
+#if (PAGE_SIZE < 8192)
+	if (ring_uses_large_buffer(ring))
+		return IGC_RXBUFFER_3072;
+
+	if (ring_uses_build_skb(ring))
+		return IGC_MAX_FRAME_BUILD_SKB + IGC_TS_HDR_LEN;
+#endif
+	return IGC_RXBUFFER_2048;
+}
+
+static inline unsigned int igc_rx_pg_order(struct igc_ring *ring)
+{
+#if (PAGE_SIZE < 8192)
+	if (ring_uses_large_buffer(ring))
+		return 1;
+#endif
+	return 0;
+}
+
+#define igc_rx_pg_size(_ring) (PAGE_SIZE << igc_rx_pg_order(_ring))
+
+#define IGC_RX_DESC(R, i)       \
+	(&(((union igc_adv_rx_desc *)((R)->desc))[i]))
+#define IGC_TX_DESC(R, i)       \
+	(&(((union igc_adv_tx_desc *)((R)->desc))[i]))
+#define IGC_TX_CTXTDESC(R, i)   \
+	(&(((struct igc_adv_tx_context_desc *)((R)->desc))[i]))
+
 #endif /* _IGC_H_ */
diff --git a/drivers/net/ethernet/intel/igc/igc_base.c b/drivers/net/ethernet/intel/igc/igc_base.c
new file mode 100644
index 000000000000..3425b7466017
--- /dev/null
+++ b/drivers/net/ethernet/intel/igc/igc_base.c
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c)  2018 Intel Corporation */
+
+#include <linux/delay.h>
+
+#include "igc_hw.h"
+#include "igc_i225.h"
+
+/**
+ * igc_rx_fifo_flush_base - Clean rx fifo after Rx enable
+ * @hw: pointer to the HW structure
+ *
+ * After Rx enable, if manageability is enabled then there is likely some
+ * bad data at the start of the fifo and possibly in the DMA fifo.  This
+ * function clears the fifos and flushes any packets that came in as rx was
+ * being enabled.
+ */
+void igc_rx_fifo_flush_base(struct igc_hw *hw)
+{
+	u32 rctl, rlpml, rxdctl[4], rfctl, temp_rctl, rx_enabled;
+	int i, ms_wait;
+
+	/* disable IPv6 options as per hardware errata */
+	rfctl = rd32(IGC_RFCTL);
+	rfctl |= IGC_RFCTL_IPV6_EX_DIS;
+	wr32(IGC_RFCTL, rfctl);
+
+	if (!(rd32(IGC_MANC) & IGC_MANC_RCV_TCO_EN))
+		return;
+
+	/* Disable all Rx queues */
+	for (i = 0; i < 4; i++) {
+		rxdctl[i] = rd32(IGC_RXDCTL(i));
+		wr32(IGC_RXDCTL(i),
+		     rxdctl[i] & ~IGC_RXDCTL_QUEUE_ENABLE);
+	}
+	/* Poll all queues to verify they have shut down */
+	for (ms_wait = 0; ms_wait < 10; ms_wait++) {
+		usleep_range(1000, 2000);
+		rx_enabled = 0;
+		for (i = 0; i < 4; i++)
+			rx_enabled |= rd32(IGC_RXDCTL(i));
+		if (!(rx_enabled & IGC_RXDCTL_QUEUE_ENABLE))
+			break;
+	}
+
+	if (ms_wait == 10)
+		pr_debug("Queue disable timed out after 10ms\n");
+
+	/* Clear RLPML, RCTL.SBP, RFCTL.LEF, and set RCTL.LPE so that all
+	 * incoming packets are rejected.  Set enable and wait 2ms so that
+	 * any packet that was coming in as RCTL.EN was set is flushed
+	 */
+	wr32(IGC_RFCTL, rfctl & ~IGC_RFCTL_LEF);
+
+	rlpml = rd32(IGC_RLPML);
+	wr32(IGC_RLPML, 0);
+
+	rctl = rd32(IGC_RCTL);
+	temp_rctl = rctl & ~(IGC_RCTL_EN | IGC_RCTL_SBP);
+	temp_rctl |= IGC_RCTL_LPE;
+
+	wr32(IGC_RCTL, temp_rctl);
+	wr32(IGC_RCTL, temp_rctl | IGC_RCTL_EN);
+	wrfl();
+	usleep_range(2000, 3000);
+
+	/* Enable Rx queues that were previously enabled and restore our
+	 * previous state
+	 */
+	for (i = 0; i < 4; i++)
+		wr32(IGC_RXDCTL(i), rxdctl[i]);
+	wr32(IGC_RCTL, rctl);
+	wrfl();
+
+	wr32(IGC_RLPML, rlpml);
+	wr32(IGC_RFCTL, rfctl);
+
+	/* Flush receive errors generated by workaround */
+	rd32(IGC_ROC);
+	rd32(IGC_RNBC);
+	rd32(IGC_MPC);
+}
diff --git a/drivers/net/ethernet/intel/igc/igc_base.h b/drivers/net/ethernet/intel/igc/igc_base.h
new file mode 100644
index 000000000000..4bdb4ecf3bc8
--- /dev/null
+++ b/drivers/net/ethernet/intel/igc/igc_base.h
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c)  2018 Intel Corporation */
+
+#ifndef _IGC_BASE_H
+#define _IGC_BASE_H
+
+/* forward declaration */
+void igc_rx_fifo_flush_base(struct igc_hw *hw);
+
+/* Transmit Descriptor - Advanced */
+union igc_adv_tx_desc {
+	struct {
+		__le64 buffer_addr;    /* Address of descriptor's data buf */
+		__le32 cmd_type_len;
+		__le32 olinfo_status;
+	} read;
+	struct {
+		__le64 rsvd;       /* Reserved */
+		__le32 nxtseq_seed;
+		__le32 status;
+	} wb;
+};
+
+struct igc_adv_data_desc {
+	__le64 buffer_addr;    /* Address of the descriptor's data buffer */
+	union {
+		u32 data;
+		struct {
+			u32 datalen:16; /* Data buffer length */
+			u32 rsvd:4;
+			u32 dtyp:4;  /* Descriptor type */
+			u32 dcmd:8;  /* Descriptor command */
+		} config;
+	} lower;
+	union {
+		u32 data;
+		struct {
+			u32 status:4;  /* Descriptor status */
+			u32 idx:4;
+			u32 popts:6;  /* Packet Options */
+			u32 paylen:18; /* Payload length */
+		} options;
+	} upper;
+};
+
+/* Receive Descriptor - Advanced */
+union igc_adv_rx_desc {
+	struct {
+		__le64 pkt_addr; /* Packet buffer address */
+		__le64 hdr_addr; /* Header buffer address */
+	} read;
+	struct {
+		struct {
+			union {
+				__le32 data;
+				struct {
+					__le16 pkt_info; /*RSS type, Pkt type*/
+					/* Split Header, header buffer len */
+					__le16 hdr_info;
+				} hs_rss;
+			} lo_dword;
+			union {
+				__le32 rss; /* RSS Hash */
+				struct {
+					__le16 ip_id; /* IP id */
+					__le16 csum; /* Packet Checksum */
+				} csum_ip;
+			} hi_dword;
+		} lower;
+		struct {
+			__le32 status_error; /* ext status/error */
+			__le16 length; /* Packet length */
+			__le16 vlan; /* VLAN tag */
+		} upper;
+	} wb;  /* writeback */
+};
+
+/* Additional Transmit Descriptor Control definitions */
+#define IGC_TXDCTL_QUEUE_ENABLE	0x02000000 /* Ena specific Tx Queue */
+
+/* Additional Receive Descriptor Control definitions */
+#define IGC_RXDCTL_QUEUE_ENABLE	0x02000000 /* Ena specific Rx Queue */
+
+/* SRRCTL bit definitions */
+#define IGC_SRRCTL_BSIZEPKT_SHIFT		10 /* Shift _right_ */
+#define IGC_SRRCTL_BSIZEHDRSIZE_SHIFT		2  /* Shift _left_ */
+#define IGC_SRRCTL_DESCTYPE_ADV_ONEBUF	0x02000000
+
+#endif /* _IGC_BASE_H */
diff --git a/drivers/net/ethernet/intel/igc/igc_defines.h b/drivers/net/ethernet/intel/igc/igc_defines.h
index 7262ad44dcf8..dbc30dead461 100644
--- a/drivers/net/ethernet/intel/igc/igc_defines.h
+++ b/drivers/net/ethernet/intel/igc/igc_defines.h
@@ -51,6 +51,10 @@
 #define IGC_ICR_RXO		BIT(6)	/* Rx overrun */
 #define IGC_ICR_RXT0		BIT(7)	/* Rx timer intr (ring 0) */
 #define IGC_ICR_DRSTA		BIT(30)	/* Device Reset Asserted */
+
+/* If this bit asserted, the driver should claim the interrupt */
+#define IGC_ICR_INT_ASSERTED	BIT(31)
+
 #define IGC_ICS_RXT0		IGC_ICR_RXT0 /* Rx timer intr */
 
 #define IMS_ENABLE_MASK ( \
@@ -80,6 +84,45 @@
 #define IGC_GPIE_EIAME		0x40000000
 #define IGC_GPIE_PBA		0x80000000
 
+/* Transmit Control */
+#define IGC_TCTL_EN		0x00000002 /* enable Tx */
+#define IGC_TCTL_PSP		0x00000008 /* pad short packets */
+#define IGC_TCTL_CT		0x00000ff0 /* collision threshold */
+#define IGC_TCTL_COLD		0x003ff000 /* collision distance */
+#define IGC_TCTL_RTLC		0x01000000 /* Re-transmit on late collision */
+#define IGC_TCTL_MULR		0x10000000 /* Multiple request support */
+
+#define IGC_CT_SHIFT			4
+#define IGC_COLLISION_THRESHOLD		15
+
+/* Management Control */
+#define IGC_MANC_RCV_TCO_EN	0x00020000 /* Receive TCO Packets Enabled */
+
+/* Receive Control */
+#define IGC_RCTL_RST		0x00000001 /* Software reset */
+#define IGC_RCTL_EN		0x00000002 /* enable */
+#define IGC_RCTL_SBP		0x00000004 /* store bad packet */
+#define IGC_RCTL_UPE		0x00000008 /* unicast promisc enable */
+#define IGC_RCTL_MPE		0x00000010 /* multicast promisc enable */
+#define IGC_RCTL_LPE		0x00000020 /* long packet enable */
+#define IGC_RCTL_LBM_MAC	0x00000040 /* MAC loopback mode */
+#define IGC_RCTL_LBM_TCVR	0x000000C0 /* tcvr loopback mode */
+
+#define IGC_RCTL_RDMTS_HALF	0x00000000 /* Rx desc min thresh size */
+#define IGC_RCTL_BAM		0x00008000 /* broadcast enable */
+
+/* Header split receive */
+#define IGC_RFCTL_IPV6_EX_DIS	0x00010000
+#define IGC_RFCTL_LEF		0x00040000
+
+#define IGC_RCTL_SZ_256		0x00030000 /* Rx buffer size 256 */
+
+#define IGC_RCTL_MO_SHIFT	12 /* multicast offset shift */
+#define IGC_RCTL_CFIEN		0x00080000 /* canonical form enable */
+#define IGC_RCTL_DPF		0x00400000 /* discard pause frames */
+#define IGC_RCTL_PMCF		0x00800000 /* pass MAC control frames */
+#define IGC_RCTL_SECRC		0x04000000 /* Strip Ethernet CRC */
+
 #define IGC_N0_QUEUE -1
 
 #endif /* _IGC_DEFINES_H_ */
diff --git a/drivers/net/ethernet/intel/igc/igc_hw.h b/drivers/net/ethernet/intel/igc/igc_hw.h
index 3905efb1bb1b..a032495a0479 100644
--- a/drivers/net/ethernet/intel/igc/igc_hw.h
+++ b/drivers/net/ethernet/intel/igc/igc_hw.h
@@ -10,6 +10,7 @@
 #include "igc_defines.h"
 #include "igc_mac.h"
 #include "igc_i225.h"
+#include "igc_base.h"
 
 #define IGC_DEV_ID_I225_LM			0x15F2
 #define IGC_DEV_ID_I225_V			0x15F3
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 0fd66620cfa1..373ccea86fb0 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -37,10 +37,12 @@ static const struct pci_device_id igc_pci_tbl[] = {
 MODULE_DEVICE_TABLE(pci, igc_pci_tbl);
 
 /* forward declaration */
+static void igc_clean_tx_ring(struct igc_ring *tx_ring);
 static int igc_sw_init(struct igc_adapter *);
 static void igc_configure(struct igc_adapter *adapter);
 static void igc_power_down_link(struct igc_adapter *adapter);
 static void igc_set_default_mac_filter(struct igc_adapter *adapter);
+static void igc_set_rx_mode(struct net_device *netdev);
 static void igc_write_itr(struct igc_q_vector *q_vector);
 static void igc_assign_vector(struct igc_q_vector *q_vector, int msix_vector);
 static void igc_free_q_vector(struct igc_adapter *adapter, int v_idx);
@@ -119,6 +121,527 @@ static void igc_get_hw_control(struct igc_adapter *adapter)
 }
 
 /**
+ * igc_free_tx_resources - Free Tx Resources per Queue
+ * @tx_ring: Tx descriptor ring for a specific queue
+ *
+ * Free all transmit software resources
+ */
+static void igc_free_tx_resources(struct igc_ring *tx_ring)
+{
+	igc_clean_tx_ring(tx_ring);
+
+	vfree(tx_ring->tx_buffer_info);
+	tx_ring->tx_buffer_info = NULL;
+
+	/* if not set, then don't free */
+	if (!tx_ring->desc)
+		return;
+
+	dma_free_coherent(tx_ring->dev, tx_ring->size,
+			  tx_ring->desc, tx_ring->dma);
+
+	tx_ring->desc = NULL;
+}
+
+/**
+ * igc_free_all_tx_resources - Free Tx Resources for All Queues
+ * @adapter: board private structure
+ *
+ * Free all transmit software resources
+ */
+static void igc_free_all_tx_resources(struct igc_adapter *adapter)
+{
+	int i;
+
+	for (i = 0; i < adapter->num_tx_queues; i++)
+		igc_free_tx_resources(adapter->tx_ring[i]);
+}
+
+/**
+ * igc_clean_tx_ring - Free Tx Buffers
+ * @tx_ring: ring to be cleaned
+ */
+static void igc_clean_tx_ring(struct igc_ring *tx_ring)
+{
+	u16 i = tx_ring->next_to_clean;
+	struct igc_tx_buffer *tx_buffer = &tx_ring->tx_buffer_info[i];
+
+	while (i != tx_ring->next_to_use) {
+		union igc_adv_tx_desc *eop_desc, *tx_desc;
+
+		/* Free all the Tx ring sk_buffs */
+		dev_kfree_skb_any(tx_buffer->skb);
+
+		/* unmap skb header data */
+		dma_unmap_single(tx_ring->dev,
+				 dma_unmap_addr(tx_buffer, dma),
+				 dma_unmap_len(tx_buffer, len),
+				 DMA_TO_DEVICE);
+
+		/* check for eop_desc to determine the end of the packet */
+		eop_desc = tx_buffer->next_to_watch;
+		tx_desc = IGC_TX_DESC(tx_ring, i);
+
+		/* unmap remaining buffers */
+		while (tx_desc != eop_desc) {
+			tx_buffer++;
+			tx_desc++;
+			i++;
+			if (unlikely(i == tx_ring->count)) {
+				i = 0;
+				tx_buffer = tx_ring->tx_buffer_info;
+				tx_desc = IGC_TX_DESC(tx_ring, 0);
+			}
+
+			/* unmap any remaining paged data */
+			if (dma_unmap_len(tx_buffer, len))
+				dma_unmap_page(tx_ring->dev,
+					       dma_unmap_addr(tx_buffer, dma),
+					       dma_unmap_len(tx_buffer, len),
+					       DMA_TO_DEVICE);
+		}
+
+		/* move us one more past the eop_desc for start of next pkt */
+		tx_buffer++;
+		i++;
+		if (unlikely(i == tx_ring->count)) {
+			i = 0;
+			tx_buffer = tx_ring->tx_buffer_info;
+		}
+	}
+
+	/* reset BQL for queue */
+	netdev_tx_reset_queue(txring_txq(tx_ring));
+
+	/* reset next_to_use and next_to_clean */
+	tx_ring->next_to_use = 0;
+	tx_ring->next_to_clean = 0;
+}
+
+/**
+ * igc_setup_tx_resources - allocate Tx resources (Descriptors)
+ * @tx_ring: tx descriptor ring (for a specific queue) to setup
+ *
+ * Return 0 on success, negative on failure
+ */
+static int igc_setup_tx_resources(struct igc_ring *tx_ring)
+{
+	struct device *dev = tx_ring->dev;
+	int size = 0;
+
+	size = sizeof(struct igc_tx_buffer) * tx_ring->count;
+	tx_ring->tx_buffer_info = vzalloc(size);
+	if (!tx_ring->tx_buffer_info)
+		goto err;
+
+	/* round up to nearest 4K */
+	tx_ring->size = tx_ring->count * sizeof(union igc_adv_tx_desc);
+	tx_ring->size = ALIGN(tx_ring->size, 4096);
+
+	tx_ring->desc = dma_alloc_coherent(dev, tx_ring->size,
+					   &tx_ring->dma, GFP_KERNEL);
+
+	if (!tx_ring->desc)
+		goto err;
+
+	tx_ring->next_to_use = 0;
+	tx_ring->next_to_clean = 0;
+
+	return 0;
+
+err:
+	vfree(tx_ring->tx_buffer_info);
+	dev_err(dev,
+		"Unable to allocate memory for the transmit descriptor ring\n");
+	return -ENOMEM;
+}
+
+/**
+ * igc_setup_all_tx_resources - wrapper to allocate Tx resources for all queues
+ * @adapter: board private structure
+ *
+ * Return 0 on success, negative on failure
+ */
+static int igc_setup_all_tx_resources(struct igc_adapter *adapter)
+{
+	struct pci_dev *pdev = adapter->pdev;
+	int i, err = 0;
+
+	for (i = 0; i < adapter->num_tx_queues; i++) {
+		err = igc_setup_tx_resources(adapter->tx_ring[i]);
+		if (err) {
+			dev_err(&pdev->dev,
+				"Allocation for Tx Queue %u failed\n", i);
+			for (i--; i >= 0; i--)
+				igc_free_tx_resources(adapter->tx_ring[i]);
+			break;
+		}
+	}
+
+	return err;
+}
+
+/**
+ * igc_clean_rx_ring - Free Rx Buffers per Queue
+ * @rx_ring: ring to free buffers from
+ */
+static void igc_clean_rx_ring(struct igc_ring *rx_ring)
+{
+	u16 i = rx_ring->next_to_clean;
+
+	if (rx_ring->skb)
+		dev_kfree_skb(rx_ring->skb);
+	rx_ring->skb = NULL;
+
+	/* Free all the Rx ring sk_buffs */
+	while (i != rx_ring->next_to_alloc) {
+		struct igc_rx_buffer *buffer_info = &rx_ring->rx_buffer_info[i];
+
+		/* Invalidate cache lines that may have been written to by
+		 * device so that we avoid corrupting memory.
+		 */
+		dma_sync_single_range_for_cpu(rx_ring->dev,
+					      buffer_info->dma,
+					      buffer_info->page_offset,
+					      igc_rx_bufsz(rx_ring),
+					      DMA_FROM_DEVICE);
+
+		/* free resources associated with mapping */
+		dma_unmap_page_attrs(rx_ring->dev,
+				     buffer_info->dma,
+				     igc_rx_pg_size(rx_ring),
+				     DMA_FROM_DEVICE,
+				     IGC_RX_DMA_ATTR);
+		__page_frag_cache_drain(buffer_info->page,
+					buffer_info->pagecnt_bias);
+
+		i++;
+		if (i == rx_ring->count)
+			i = 0;
+	}
+
+	rx_ring->next_to_alloc = 0;
+	rx_ring->next_to_clean = 0;
+	rx_ring->next_to_use = 0;
+}
+
+/**
+ * igc_free_rx_resources - Free Rx Resources
+ * @rx_ring: ring to clean the resources from
+ *
+ * Free all receive software resources
+ */
+static void igc_free_rx_resources(struct igc_ring *rx_ring)
+{
+	igc_clean_rx_ring(rx_ring);
+
+	vfree(rx_ring->rx_buffer_info);
+	rx_ring->rx_buffer_info = NULL;
+
+	/* if not set, then don't free */
+	if (!rx_ring->desc)
+		return;
+
+	dma_free_coherent(rx_ring->dev, rx_ring->size,
+			  rx_ring->desc, rx_ring->dma);
+
+	rx_ring->desc = NULL;
+}
+
+/**
+ * igc_free_all_rx_resources - Free Rx Resources for All Queues
+ * @adapter: board private structure
+ *
+ * Free all receive software resources
+ */
+static void igc_free_all_rx_resources(struct igc_adapter *adapter)
+{
+	int i;
+
+	for (i = 0; i < adapter->num_rx_queues; i++)
+		igc_free_rx_resources(adapter->rx_ring[i]);
+}
+
+/**
+ * igc_setup_rx_resources - allocate Rx resources (Descriptors)
+ * @rx_ring:    rx descriptor ring (for a specific queue) to setup
+ *
+ * Returns 0 on success, negative on failure
+ */
+static int igc_setup_rx_resources(struct igc_ring *rx_ring)
+{
+	struct device *dev = rx_ring->dev;
+	int size, desc_len;
+
+	size = sizeof(struct igc_rx_buffer) * rx_ring->count;
+	rx_ring->rx_buffer_info = vzalloc(size);
+	if (!rx_ring->rx_buffer_info)
+		goto err;
+
+	desc_len = sizeof(union igc_adv_rx_desc);
+
+	/* Round up to nearest 4K */
+	rx_ring->size = rx_ring->count * desc_len;
+	rx_ring->size = ALIGN(rx_ring->size, 4096);
+
+	rx_ring->desc = dma_alloc_coherent(dev, rx_ring->size,
+					   &rx_ring->dma, GFP_KERNEL);
+
+	if (!rx_ring->desc)
+		goto err;
+
+	rx_ring->next_to_alloc = 0;
+	rx_ring->next_to_clean = 0;
+	rx_ring->next_to_use = 0;
+
+	return 0;
+
+err:
+	vfree(rx_ring->rx_buffer_info);
+	rx_ring->rx_buffer_info = NULL;
+	dev_err(dev,
+		"Unable to allocate memory for the receive descriptor ring\n");
+	return -ENOMEM;
+}
+
+/**
+ * igc_setup_all_rx_resources - wrapper to allocate Rx resources
+ *                                (Descriptors) for all queues
+ * @adapter: board private structure
+ *
+ * Return 0 on success, negative on failure
+ */
+static int igc_setup_all_rx_resources(struct igc_adapter *adapter)
+{
+	struct pci_dev *pdev = adapter->pdev;
+	int i, err = 0;
+
+	for (i = 0; i < adapter->num_rx_queues; i++) {
+		err = igc_setup_rx_resources(adapter->rx_ring[i]);
+		if (err) {
+			dev_err(&pdev->dev,
+				"Allocation for Rx Queue %u failed\n", i);
+			for (i--; i >= 0; i--)
+				igc_free_rx_resources(adapter->rx_ring[i]);
+			break;
+		}
+	}
+
+	return err;
+}
+
+/**
+ * igc_configure_rx_ring - Configure a receive ring after Reset
+ * @adapter: board private structure
+ * @ring: receive ring to be configured
+ *
+ * Configure the Rx unit of the MAC after a reset.
+ */
+static void igc_configure_rx_ring(struct igc_adapter *adapter,
+				  struct igc_ring *ring)
+{
+	struct igc_hw *hw = &adapter->hw;
+	union igc_adv_rx_desc *rx_desc;
+	int reg_idx = ring->reg_idx;
+	u32 srrctl = 0, rxdctl = 0;
+	u64 rdba = ring->dma;
+
+	/* disable the queue */
+	wr32(IGC_RXDCTL(reg_idx), 0);
+
+	/* Set DMA base address registers */
+	wr32(IGC_RDBAL(reg_idx),
+	     rdba & 0x00000000ffffffffULL);
+	wr32(IGC_RDBAH(reg_idx), rdba >> 32);
+	wr32(IGC_RDLEN(reg_idx),
+	     ring->count * sizeof(union igc_adv_rx_desc));
+
+	/* initialize head and tail */
+	ring->tail = adapter->io_addr + IGC_RDT(reg_idx);
+	wr32(IGC_RDH(reg_idx), 0);
+	writel(0, ring->tail);
+
+	/* reset next-to- use/clean to place SW in sync with hardware */
+	ring->next_to_clean = 0;
+	ring->next_to_use = 0;
+
+	/* set descriptor configuration */
+	srrctl = IGC_RX_HDR_LEN << IGC_SRRCTL_BSIZEHDRSIZE_SHIFT;
+	if (ring_uses_large_buffer(ring))
+		srrctl |= IGC_RXBUFFER_3072 >> IGC_SRRCTL_BSIZEPKT_SHIFT;
+	else
+		srrctl |= IGC_RXBUFFER_2048 >> IGC_SRRCTL_BSIZEPKT_SHIFT;
+	srrctl |= IGC_SRRCTL_DESCTYPE_ADV_ONEBUF;
+
+	wr32(IGC_SRRCTL(reg_idx), srrctl);
+
+	rxdctl |= IGC_RX_PTHRESH;
+	rxdctl |= IGC_RX_HTHRESH << 8;
+	rxdctl |= IGC_RX_WTHRESH << 16;
+
+	/* initialize rx_buffer_info */
+	memset(ring->rx_buffer_info, 0,
+	       sizeof(struct igc_rx_buffer) * ring->count);
+
+	/* initialize Rx descriptor 0 */
+	rx_desc = IGC_RX_DESC(ring, 0);
+	rx_desc->wb.upper.length = 0;
+
+	/* enable receive descriptor fetching */
+	rxdctl |= IGC_RXDCTL_QUEUE_ENABLE;
+
+	wr32(IGC_RXDCTL(reg_idx), rxdctl);
+}
+
+/**
+ * igc_configure_rx - Configure receive Unit after Reset
+ * @adapter: board private structure
+ *
+ * Configure the Rx unit of the MAC after a reset.
+ */
+static void igc_configure_rx(struct igc_adapter *adapter)
+{
+	int i;
+
+	/* Setup the HW Rx Head and Tail Descriptor Pointers and
+	 * the Base and Length of the Rx Descriptor Ring
+	 */
+	for (i = 0; i < adapter->num_rx_queues; i++)
+		igc_configure_rx_ring(adapter, adapter->rx_ring[i]);
+}
+
+/**
+ * igc_configure_tx_ring - Configure transmit ring after Reset
+ * @adapter: board private structure
+ * @ring: tx ring to configure
+ *
+ * Configure a transmit ring after a reset.
+ */
+static void igc_configure_tx_ring(struct igc_adapter *adapter,
+				  struct igc_ring *ring)
+{
+	struct igc_hw *hw = &adapter->hw;
+	int reg_idx = ring->reg_idx;
+	u64 tdba = ring->dma;
+	u32 txdctl = 0;
+
+	/* disable the queue */
+	wr32(IGC_TXDCTL(reg_idx), 0);
+	wrfl();
+	mdelay(10);
+
+	wr32(IGC_TDLEN(reg_idx),
+	     ring->count * sizeof(union igc_adv_tx_desc));
+	wr32(IGC_TDBAL(reg_idx),
+	     tdba & 0x00000000ffffffffULL);
+	wr32(IGC_TDBAH(reg_idx), tdba >> 32);
+
+	ring->tail = adapter->io_addr + IGC_TDT(reg_idx);
+	wr32(IGC_TDH(reg_idx), 0);
+	writel(0, ring->tail);
+
+	txdctl |= IGC_TX_PTHRESH;
+	txdctl |= IGC_TX_HTHRESH << 8;
+	txdctl |= IGC_TX_WTHRESH << 16;
+
+	txdctl |= IGC_TXDCTL_QUEUE_ENABLE;
+	wr32(IGC_TXDCTL(reg_idx), txdctl);
+}
+
+/**
+ * igc_configure_tx - Configure transmit Unit after Reset
+ * @adapter: board private structure
+ *
+ * Configure the Tx unit of the MAC after a reset.
+ */
+static void igc_configure_tx(struct igc_adapter *adapter)
+{
+	int i;
+
+	for (i = 0; i < adapter->num_tx_queues; i++)
+		igc_configure_tx_ring(adapter, adapter->tx_ring[i]);
+}
+
+/**
+ * igc_setup_mrqc - configure the multiple receive queue control registers
+ * @adapter: Board private structure
+ */
+static void igc_setup_mrqc(struct igc_adapter *adapter)
+{
+}
+
+/**
+ * igc_setup_rctl - configure the receive control registers
+ * @adapter: Board private structure
+ */
+static void igc_setup_rctl(struct igc_adapter *adapter)
+{
+	struct igc_hw *hw = &adapter->hw;
+	u32 rctl;
+
+	rctl = rd32(IGC_RCTL);
+
+	rctl &= ~(3 << IGC_RCTL_MO_SHIFT);
+	rctl &= ~(IGC_RCTL_LBM_TCVR | IGC_RCTL_LBM_MAC);
+
+	rctl |= IGC_RCTL_EN | IGC_RCTL_BAM | IGC_RCTL_RDMTS_HALF |
+		(hw->mac.mc_filter_type << IGC_RCTL_MO_SHIFT);
+
+	/* enable stripping of CRC. Newer features require
+	 * that the HW strips the CRC.
+	 */
+	rctl |= IGC_RCTL_SECRC;
+
+	/* disable store bad packets and clear size bits. */
+	rctl &= ~(IGC_RCTL_SBP | IGC_RCTL_SZ_256);
+
+	/* enable LPE to allow for reception of jumbo frames */
+	rctl |= IGC_RCTL_LPE;
+
+	/* disable queue 0 to prevent tail write w/o re-config */
+	wr32(IGC_RXDCTL(0), 0);
+
+	/* This is useful for sniffing bad packets. */
+	if (adapter->netdev->features & NETIF_F_RXALL) {
+		/* UPE and MPE will be handled by normal PROMISC logic
+		 * in set_rx_mode
+		 */
+		rctl |= (IGC_RCTL_SBP | /* Receive bad packets */
+			 IGC_RCTL_BAM | /* RX All Bcast Pkts */
+			 IGC_RCTL_PMCF); /* RX All MAC Ctrl Pkts */
+
+		rctl &= ~(IGC_RCTL_DPF | /* Allow filtered pause */
+			  IGC_RCTL_CFIEN); /* Disable VLAN CFIEN Filter */
+	}
+
+	wr32(IGC_RCTL, rctl);
+}
+
+/**
+ * igc_setup_tctl - configure the transmit control registers
+ * @adapter: Board private structure
+ */
+static void igc_setup_tctl(struct igc_adapter *adapter)
+{
+	struct igc_hw *hw = &adapter->hw;
+	u32 tctl;
+
+	/* disable queue 0 which icould be enabled by default */
+	wr32(IGC_TXDCTL(0), 0);
+
+	/* Program the Transmit Control Register */
+	tctl = rd32(IGC_TCTL);
+	tctl &= ~IGC_TCTL_CT;
+	tctl |= IGC_TCTL_PSP | IGC_TCTL_RTLC |
+		(IGC_COLLISION_THRESHOLD << IGC_CT_SHIFT);
+
+	/* Enable transmits */
+	tctl |= IGC_TCTL_EN;
+
+	wr32(IGC_TCTL, tctl);
+}
+
+/**
  * igc_set_mac - Change the Ethernet Address of the NIC
  * @netdev: network interface device structure
  * @p: pointer to an address structure
@@ -150,6 +673,121 @@ static netdev_tx_t igc_xmit_frame(struct sk_buff *skb,
 	return NETDEV_TX_OK;
 }
 
+static inline unsigned int igc_rx_offset(struct igc_ring *rx_ring)
+{
+	return ring_uses_build_skb(rx_ring) ? IGC_SKB_PAD : 0;
+}
+
+static bool igc_alloc_mapped_page(struct igc_ring *rx_ring,
+				  struct igc_rx_buffer *bi)
+{
+	struct page *page = bi->page;
+	dma_addr_t dma;
+
+	/* since we are recycling buffers we should seldom need to alloc */
+	if (likely(page))
+		return true;
+
+	/* alloc new page for storage */
+	page = dev_alloc_pages(igc_rx_pg_order(rx_ring));
+	if (unlikely(!page)) {
+		rx_ring->rx_stats.alloc_failed++;
+		return false;
+	}
+
+	/* map page for use */
+	dma = dma_map_page_attrs(rx_ring->dev, page, 0,
+				 igc_rx_pg_size(rx_ring),
+				 DMA_FROM_DEVICE,
+				 IGC_RX_DMA_ATTR);
+
+	/* if mapping failed free memory back to system since
+	 * there isn't much point in holding memory we can't use
+	 */
+	if (dma_mapping_error(rx_ring->dev, dma)) {
+		__free_page(page);
+
+		rx_ring->rx_stats.alloc_failed++;
+		return false;
+	}
+
+	bi->dma = dma;
+	bi->page = page;
+	bi->page_offset = igc_rx_offset(rx_ring);
+	bi->pagecnt_bias = 1;
+
+	return true;
+}
+
+/**
+ * igc_alloc_rx_buffers - Replace used receive buffers; packet split
+ * @adapter: address of board private structure
+ */
+static void igc_alloc_rx_buffers(struct igc_ring *rx_ring, u16 cleaned_count)
+{
+	union igc_adv_rx_desc *rx_desc;
+	u16 i = rx_ring->next_to_use;
+	struct igc_rx_buffer *bi;
+	u16 bufsz;
+
+	/* nothing to do */
+	if (!cleaned_count)
+		return;
+
+	rx_desc = IGC_RX_DESC(rx_ring, i);
+	bi = &rx_ring->rx_buffer_info[i];
+	i -= rx_ring->count;
+
+	bufsz = igc_rx_bufsz(rx_ring);
+
+	do {
+		if (!igc_alloc_mapped_page(rx_ring, bi))
+			break;
+
+		/* sync the buffer for use by the device */
+		dma_sync_single_range_for_device(rx_ring->dev, bi->dma,
+						 bi->page_offset, bufsz,
+						 DMA_FROM_DEVICE);
+
+		/* Refresh the desc even if buffer_addrs didn't change
+		 * because each write-back erases this info.
+		 */
+		rx_desc->read.pkt_addr = cpu_to_le64(bi->dma + bi->page_offset);
+
+		rx_desc++;
+		bi++;
+		i++;
+		if (unlikely(!i)) {
+			rx_desc = IGC_RX_DESC(rx_ring, 0);
+			bi = rx_ring->rx_buffer_info;
+			i -= rx_ring->count;
+		}
+
+		/* clear the length for the next_to_use descriptor */
+		rx_desc->wb.upper.length = 0;
+
+		cleaned_count--;
+	} while (cleaned_count);
+
+	i += rx_ring->count;
+
+	if (rx_ring->next_to_use != i) {
+		/* record the next descriptor to use */
+		rx_ring->next_to_use = i;
+
+		/* update next to alloc since we have filled the ring */
+		rx_ring->next_to_alloc = i;
+
+		/* Force memory writes to complete before letting h/w
+		 * know there are new descriptors to fetch.  (Only
+		 * applicable for weak-ordered memory model archs,
+		 * such as IA-64).
+		 */
+		wmb();
+		writel(i, rx_ring->tail);
+	}
+}
+
 /**
  * igc_ioctl - I/O control method
  * @netdev: network interface device structure
@@ -189,6 +827,11 @@ static void igc_up(struct igc_adapter *adapter)
 	/* Clear any pending interrupts. */
 	rd32(IGC_ICR);
 	igc_irq_enable(adapter);
+
+	netif_tx_start_all_queues(adapter->netdev);
+
+	/* start the watchdog. */
+	hw->mac.get_link_status = 1;
 }
 
 /**
@@ -287,7 +930,30 @@ static struct net_device_stats *igc_get_stats(struct net_device *netdev)
  */
 static void igc_configure(struct igc_adapter *adapter)
 {
+	struct net_device *netdev = adapter->netdev;
+	int i = 0;
+
 	igc_get_hw_control(adapter);
+	igc_set_rx_mode(netdev);
+
+	igc_setup_tctl(adapter);
+	igc_setup_mrqc(adapter);
+	igc_setup_rctl(adapter);
+
+	igc_configure_tx(adapter);
+	igc_configure_rx(adapter);
+
+	igc_rx_fifo_flush_base(&adapter->hw);
+
+	/* call igc_desc_unused which always leaves
+	 * at least 1 descriptor unused to make sure
+	 * next_to_use != next_to_clean
+	 */
+	for (i = 0; i < adapter->num_rx_queues; i++) {
+		struct igc_ring *ring = adapter->rx_ring[i];
+
+		igc_alloc_rx_buffers(ring, igc_desc_unused(ring));
+	}
 }
 
 /**
@@ -336,6 +1002,19 @@ static void igc_set_default_mac_filter(struct igc_adapter *adapter)
 }
 
 /**
+ * igc_set_rx_mode - Secondary Unicast, Multicast and Promiscuous mode set
+ * @netdev: network interface device structure
+ *
+ * The set_rx_mode entry point is called whenever the unicast or multicast
+ * address lists or the network interface flags are updated.  This routine is
+ * responsible for configuring the hardware for proper unicast, multicast,
+ * promiscuous mode, and all-multi behavior.
+ */
+static void igc_set_rx_mode(struct net_device *netdev)
+{
+}
+
+/**
  * igc_msix_other - msix other interrupt handler
  * @irq: interrupt number
  * @data: pointer to a q_vector
@@ -784,6 +1463,83 @@ static void igc_update_itr(struct igc_q_vector *q_vector,
 	ring_container->itr = itrval;
 }
 
+/**
+ * igc_intr_msi - Interrupt Handler
+ * @irq: interrupt number
+ * @data: pointer to a network interface device structure
+ */
+static irqreturn_t igc_intr_msi(int irq, void *data)
+{
+	struct igc_adapter *adapter = data;
+	struct igc_q_vector *q_vector = adapter->q_vector[0];
+	struct igc_hw *hw = &adapter->hw;
+	/* read ICR disables interrupts using IAM */
+	u32 icr = rd32(IGC_ICR);
+
+	igc_write_itr(q_vector);
+
+	if (icr & IGC_ICR_DRSTA)
+		schedule_work(&adapter->reset_task);
+
+	if (icr & IGC_ICR_DOUTSYNC) {
+		/* HW is reporting DMA is out of sync */
+		adapter->stats.doosync++;
+	}
+
+	if (icr & (IGC_ICR_RXSEQ | IGC_ICR_LSC)) {
+		hw->mac.get_link_status = 1;
+		if (!test_bit(__IGC_DOWN, &adapter->state))
+			mod_timer(&adapter->watchdog_timer, jiffies + 1);
+	}
+
+	napi_schedule(&q_vector->napi);
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * igc_intr - Legacy Interrupt Handler
+ * @irq: interrupt number
+ * @data: pointer to a network interface device structure
+ */
+static irqreturn_t igc_intr(int irq, void *data)
+{
+	struct igc_adapter *adapter = data;
+	struct igc_q_vector *q_vector = adapter->q_vector[0];
+	struct igc_hw *hw = &adapter->hw;
+	/* Interrupt Auto-Mask...upon reading ICR, interrupts are masked.  No
+	 * need for the IMC write
+	 */
+	u32 icr = rd32(IGC_ICR);
+
+	/* IMS will not auto-mask if INT_ASSERTED is not set, and if it is
+	 * not set, then the adapter didn't send an interrupt
+	 */
+	if (!(icr & IGC_ICR_INT_ASSERTED))
+		return IRQ_NONE;
+
+	igc_write_itr(q_vector);
+
+	if (icr & IGC_ICR_DRSTA)
+		schedule_work(&adapter->reset_task);
+
+	if (icr & IGC_ICR_DOUTSYNC) {
+		/* HW is reporting DMA is out of sync */
+		adapter->stats.doosync++;
+	}
+
+	if (icr & (IGC_ICR_RXSEQ | IGC_ICR_LSC)) {
+		hw->mac.get_link_status = 1;
+		/* guard against interrupt when we're going down */
+		if (!test_bit(__IGC_DOWN, &adapter->state))
+			mod_timer(&adapter->watchdog_timer, jiffies + 1);
+	}
+
+	napi_schedule(&q_vector->napi);
+
+	return IRQ_HANDLED;
+}
+
 static void igc_set_itr(struct igc_q_vector *q_vector)
 {
 	struct igc_adapter *adapter = q_vector->adapter;
@@ -1147,6 +1903,29 @@ err_out:
 }
 
 /**
+ * igc_cache_ring_register - Descriptor ring to register mapping
+ * @adapter: board private structure to initialize
+ *
+ * Once we know the feature-set enabled for the device, we'll cache
+ * the register offset the descriptor ring is assigned to.
+ */
+static void igc_cache_ring_register(struct igc_adapter *adapter)
+{
+	int i = 0, j = 0;
+
+	switch (adapter->hw.mac.type) {
+	case igc_i225:
+	/* Fall through */
+	default:
+		for (; i < adapter->num_rx_queues; i++)
+			adapter->rx_ring[i]->reg_idx = i;
+		for (; j < adapter->num_tx_queues; j++)
+			adapter->tx_ring[j]->reg_idx = j;
+		break;
+	}
+}
+
+/**
  * igc_init_interrupt_scheme - initialize interrupts, allocate queues/vectors
  * @adapter: Pointer to adapter structure
  *
@@ -1165,6 +1944,8 @@ static int igc_init_interrupt_scheme(struct igc_adapter *adapter, bool msix)
 		goto err_alloc_q_vectors;
 	}
 
+	igc_cache_ring_register(adapter);
+
 	return 0;
 
 err_alloc_q_vectors:
@@ -1252,6 +2033,8 @@ static void igc_irq_enable(struct igc_adapter *adapter)
  */
 static int igc_request_irq(struct igc_adapter *adapter)
 {
+	struct net_device *netdev = adapter->netdev;
+	struct pci_dev *pdev = adapter->pdev;
 	int err = 0;
 
 	if (adapter->flags & IGC_FLAG_HAS_MSIX) {
@@ -1259,14 +2042,38 @@ static int igc_request_irq(struct igc_adapter *adapter)
 		if (!err)
 			goto request_done;
 		/* fall back to MSI */
+		igc_free_all_tx_resources(adapter);
+		igc_free_all_rx_resources(adapter);
 
 		igc_clear_interrupt_scheme(adapter);
 		err = igc_init_interrupt_scheme(adapter, false);
 		if (err)
 			goto request_done;
+		igc_setup_all_tx_resources(adapter);
+		igc_setup_all_rx_resources(adapter);
 		igc_configure(adapter);
 	}
 
+	igc_assign_vector(adapter->q_vector[0], 0);
+
+	if (adapter->flags & IGC_FLAG_HAS_MSI) {
+		err = request_irq(pdev->irq, &igc_intr_msi, 0,
+				  netdev->name, adapter);
+		if (!err)
+			goto request_done;
+
+		/* fall back to legacy interrupts */
+		igc_reset_interrupt_capability(adapter);
+		adapter->flags &= ~IGC_FLAG_HAS_MSI;
+	}
+
+	err = request_irq(pdev->irq, &igc_intr, IRQF_SHARED,
+			  netdev->name, adapter);
+
+	if (err)
+		dev_err(&pdev->dev, "Error %d getting interrupt\n",
+			err);
+
 request_done:
 	return err;
 }
@@ -1315,6 +2122,16 @@ static int __igc_open(struct net_device *netdev, bool resuming)
 
 	netif_carrier_off(netdev);
 
+	/* allocate transmit descriptors */
+	err = igc_setup_all_tx_resources(adapter);
+	if (err)
+		goto err_setup_tx;
+
+	/* allocate receive descriptors */
+	err = igc_setup_all_rx_resources(adapter);
+	if (err)
+		goto err_setup_rx;
+
 	igc_power_up_link(adapter);
 
 	igc_configure(adapter);
@@ -1341,6 +2158,8 @@ static int __igc_open(struct net_device *netdev, bool resuming)
 	rd32(IGC_ICR);
 	igc_irq_enable(adapter);
 
+	netif_tx_start_all_queues(netdev);
+
 	/* start the watchdog. */
 	hw->mac.get_link_status = 1;
 
@@ -1351,6 +2170,11 @@ err_set_queues:
 err_req_irq:
 	igc_release_hw_control(adapter);
 	igc_power_down_link(adapter);
+	igc_free_all_rx_resources(adapter);
+err_setup_rx:
+	igc_free_all_tx_resources(adapter);
+err_setup_tx:
+	igc_reset(adapter);
 
 	return err;
 }
@@ -1383,6 +2207,9 @@ static int __igc_close(struct net_device *netdev, bool suspending)
 
 	igc_free_irq(adapter);
 
+	igc_free_all_tx_resources(adapter);
+	igc_free_all_rx_resources(adapter);
+
 	return 0;
 }
 
diff --git a/drivers/net/ethernet/intel/igc/igc_regs.h b/drivers/net/ethernet/intel/igc/igc_regs.h
index 2372d6d68dbc..e268986eeb9f 100644
--- a/drivers/net/ethernet/intel/igc/igc_regs.h
+++ b/drivers/net/ethernet/intel/igc/igc_regs.h
@@ -168,6 +168,9 @@
 #define IGC_SCVPC	0x04228  /* SerDes/SGMII Code Violation Pkt Count */
 #define IGC_HRMPC	0x0A018  /* Header Redirection Missed Packet Count */
 
+/* Management registers */
+#define IGC_MANC	0x05820  /* Management Control - RW */
+
 /* forward declaration */
 struct igc_hw;
 u32 igc_rd32(struct igc_hw *hw, u32 reg);