enic: add Cisco 10G Ethernet NIC driver

Signed-off-by: Scott Feldman <scofeldm@cisco.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 1949 insertions, 0 deletions

diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
new file mode 100644
index 000000000000..4cf5ec76c993
--- /dev/null
+++ b/drivers/net/enic/enic_main.c
@@ -0,0 +1,1949 @@
+/*
+ * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
+ * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/workqueue.h>
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+#include <linux/ethtool.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/tcp.h>
+
+#include "cq_enet_desc.h"
+#include "vnic_dev.h"
+#include "vnic_intr.h"
+#include "vnic_stats.h"
+#include "enic_res.h"
+#include "enic.h"
+
+#define ENIC_NOTIFY_TIMER_PERIOD	(2 * HZ)
+#define ENIC_JUMBO_FIRST_BUF_SIZE	256
+
+/* Supported devices */
+static struct pci_device_id enic_id_table[] = {
+	{ PCI_VDEVICE(CISCO, 0x0043) },
+	{ 0, }	/* end of table */
+};
+
+MODULE_DESCRIPTION(DRV_DESCRIPTION);
+MODULE_AUTHOR("Scott Feldman <scofeldm@cisco.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+MODULE_DEVICE_TABLE(pci, enic_id_table);
+
+struct enic_stat {
+	char name[ETH_GSTRING_LEN];
+	unsigned int offset;
+};
+
+#define ENIC_TX_STAT(stat)	\
+	{ .name = #stat, .offset = offsetof(struct vnic_tx_stats, stat) / 8 }
+#define ENIC_RX_STAT(stat)	\
+	{ .name = #stat, .offset = offsetof(struct vnic_rx_stats, stat) / 8 }
+
+static const struct enic_stat enic_tx_stats[] = {
+	ENIC_TX_STAT(tx_frames_ok),
+	ENIC_TX_STAT(tx_unicast_frames_ok),
+	ENIC_TX_STAT(tx_multicast_frames_ok),
+	ENIC_TX_STAT(tx_broadcast_frames_ok),
+	ENIC_TX_STAT(tx_bytes_ok),
+	ENIC_TX_STAT(tx_unicast_bytes_ok),
+	ENIC_TX_STAT(tx_multicast_bytes_ok),
+	ENIC_TX_STAT(tx_broadcast_bytes_ok),
+	ENIC_TX_STAT(tx_drops),
+	ENIC_TX_STAT(tx_errors),
+	ENIC_TX_STAT(tx_tso),
+};
+
+static const struct enic_stat enic_rx_stats[] = {
+	ENIC_RX_STAT(rx_frames_ok),
+	ENIC_RX_STAT(rx_frames_total),
+	ENIC_RX_STAT(rx_unicast_frames_ok),
+	ENIC_RX_STAT(rx_multicast_frames_ok),
+	ENIC_RX_STAT(rx_broadcast_frames_ok),
+	ENIC_RX_STAT(rx_bytes_ok),
+	ENIC_RX_STAT(rx_unicast_bytes_ok),
+	ENIC_RX_STAT(rx_multicast_bytes_ok),
+	ENIC_RX_STAT(rx_broadcast_bytes_ok),
+	ENIC_RX_STAT(rx_drop),
+	ENIC_RX_STAT(rx_no_bufs),
+	ENIC_RX_STAT(rx_errors),
+	ENIC_RX_STAT(rx_rss),
+	ENIC_RX_STAT(rx_crc_errors),
+	ENIC_RX_STAT(rx_frames_64),
+	ENIC_RX_STAT(rx_frames_127),
+	ENIC_RX_STAT(rx_frames_255),
+	ENIC_RX_STAT(rx_frames_511),
+	ENIC_RX_STAT(rx_frames_1023),
+	ENIC_RX_STAT(rx_frames_1518),
+	ENIC_RX_STAT(rx_frames_to_max),
+};
+
+static const unsigned int enic_n_tx_stats = ARRAY_SIZE(enic_tx_stats);
+static const unsigned int enic_n_rx_stats = ARRAY_SIZE(enic_rx_stats);
+
+static int enic_get_settings(struct net_device *netdev,
+	struct ethtool_cmd *ecmd)
+{
+	struct enic *enic = netdev_priv(netdev);
+
+	ecmd->supported = (SUPPORTED_10000baseT_Full | SUPPORTED_FIBRE);
+	ecmd->advertising = (ADVERTISED_10000baseT_Full | ADVERTISED_FIBRE);
+	ecmd->port = PORT_FIBRE;
+	ecmd->transceiver = XCVR_EXTERNAL;
+
+	if (netif_carrier_ok(netdev)) {
+		ecmd->speed = vnic_dev_port_speed(enic->vdev);
+		ecmd->duplex = DUPLEX_FULL;
+	} else {
+		ecmd->speed = -1;
+		ecmd->duplex = -1;
+	}
+
+	ecmd->autoneg = AUTONEG_DISABLE;
+
+	return 0;
+}
+
+static void enic_get_drvinfo(struct net_device *netdev,
+	struct ethtool_drvinfo *drvinfo)
+{
+	struct enic *enic = netdev_priv(netdev);
+	struct vnic_devcmd_fw_info *fw_info;
+
+	spin_lock(&enic->devcmd_lock);
+	vnic_dev_fw_info(enic->vdev, &fw_info);
+	spin_unlock(&enic->devcmd_lock);
+
+	strncpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
+	strncpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
+	strncpy(drvinfo->fw_version, fw_info->fw_version,
+		sizeof(drvinfo->fw_version));
+	strncpy(drvinfo->bus_info, pci_name(enic->pdev),
+		sizeof(drvinfo->bus_info));
+}
+
+static void enic_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
+{
+	unsigned int i;
+
+	switch (stringset) {
+	case ETH_SS_STATS:
+		for (i = 0; i < enic_n_tx_stats; i++) {
+			memcpy(data, enic_tx_stats[i].name, ETH_GSTRING_LEN);
+			data += ETH_GSTRING_LEN;
+		}
+		for (i = 0; i < enic_n_rx_stats; i++) {
+			memcpy(data, enic_rx_stats[i].name, ETH_GSTRING_LEN);
+			data += ETH_GSTRING_LEN;
+		}
+		break;
+	}
+}
+
+static int enic_get_stats_count(struct net_device *netdev)
+{
+	return enic_n_tx_stats + enic_n_rx_stats;
+}
+
+static void enic_get_ethtool_stats(struct net_device *netdev,
+	struct ethtool_stats *stats, u64 *data)
+{
+	struct enic *enic = netdev_priv(netdev);
+	struct vnic_stats *vstats;
+	unsigned int i;
+
+	spin_lock(&enic->devcmd_lock);
+	vnic_dev_stats_dump(enic->vdev, &vstats);
+	spin_unlock(&enic->devcmd_lock);
+
+	for (i = 0; i < enic_n_tx_stats; i++)
+		*(data++) = ((u64 *)&vstats->tx)[enic_tx_stats[i].offset];
+	for (i = 0; i < enic_n_rx_stats; i++)
+		*(data++) = ((u64 *)&vstats->rx)[enic_rx_stats[i].offset];
+}
+
+static u32 enic_get_rx_csum(struct net_device *netdev)
+{
+	struct enic *enic = netdev_priv(netdev);
+	return enic->csum_rx_enabled;
+}
+
+static int enic_set_rx_csum(struct net_device *netdev, u32 data)
+{
+	struct enic *enic = netdev_priv(netdev);
+
+	enic->csum_rx_enabled =
+		(data && ENIC_SETTING(enic, RXCSUM)) ? 1 : 0;
+
+	return 0;
+}
+
+static int enic_set_tx_csum(struct net_device *netdev, u32 data)
+{
+	struct enic *enic = netdev_priv(netdev);
+
+	if (data && ENIC_SETTING(enic, TXCSUM))
+		netdev->features |= NETIF_F_HW_CSUM;
+	else
+		netdev->features &= ~NETIF_F_HW_CSUM;
+
+	return 0;
+}
+
+static int enic_set_tso(struct net_device *netdev, u32 data)
+{
+	struct enic *enic = netdev_priv(netdev);
+
+	if (data && ENIC_SETTING(enic, TSO))
+		netdev->features |=
+			NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_TSO_ECN;
+	else
+		netdev->features &=
+			~(NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_TSO_ECN);
+
+	return 0;
+}
+
+static u32 enic_get_msglevel(struct net_device *netdev)
+{
+	struct enic *enic = netdev_priv(netdev);
+	return enic->msg_enable;
+}
+
+static void enic_set_msglevel(struct net_device *netdev, u32 value)
+{
+	struct enic *enic = netdev_priv(netdev);
+	enic->msg_enable = value;
+}
+
+static struct ethtool_ops enic_ethtool_ops = {
+	.get_settings = enic_get_settings,
+	.get_drvinfo = enic_get_drvinfo,
+	.get_msglevel = enic_get_msglevel,
+	.set_msglevel = enic_set_msglevel,
+	.get_link = ethtool_op_get_link,
+	.get_strings = enic_get_strings,
+	.get_stats_count = enic_get_stats_count,
+	.get_ethtool_stats = enic_get_ethtool_stats,
+	.get_rx_csum = enic_get_rx_csum,
+	.set_rx_csum = enic_set_rx_csum,
+	.get_tx_csum = ethtool_op_get_tx_csum,
+	.set_tx_csum = enic_set_tx_csum,
+	.get_sg = ethtool_op_get_sg,
+	.set_sg = ethtool_op_set_sg,
+	.get_tso = ethtool_op_get_tso,
+	.set_tso = enic_set_tso,
+};
+
+static void enic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
+{
+	struct enic *enic = vnic_dev_priv(wq->vdev);
+
+	if (buf->sop)
+		pci_unmap_single(enic->pdev, buf->dma_addr,
+			buf->len, PCI_DMA_TODEVICE);
+	else
+		pci_unmap_page(enic->pdev, buf->dma_addr,
+			buf->len, PCI_DMA_TODEVICE);
+
+	if (buf->os_buf)
+		dev_kfree_skb_any(buf->os_buf);
+}
+
+static void enic_wq_free_buf(struct vnic_wq *wq,
+	struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque)
+{
+	enic_free_wq_buf(wq, buf);
+}
+
+static int enic_wq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
+	u8 type, u16 q_number, u16 completed_index, void *opaque)
+{
+	struct enic *enic = vnic_dev_priv(vdev);
+
+	spin_lock(&enic->wq_lock[q_number]);
+
+	vnic_wq_service(&enic->wq[q_number], cq_desc,
+		completed_index, enic_wq_free_buf,
+		opaque);
+
+	if (netif_queue_stopped(enic->netdev) &&
+	    vnic_wq_desc_avail(&enic->wq[q_number]) >= MAX_SKB_FRAGS + 1)
+		netif_wake_queue(enic->netdev);
+
+	spin_unlock(&enic->wq_lock[q_number]);
+
+	return 0;
+}
+
+static void enic_log_q_error(struct enic *enic)
+{
+	unsigned int i;
+	u32 error_status;
+
+	for (i = 0; i < enic->wq_count; i++) {
+		error_status = vnic_wq_error_status(&enic->wq[i]);
+		if (error_status)
+			printk(KERN_ERR PFX "%s: WQ[%d] error_status %d\n",
+				enic->netdev->name, i, error_status);
+	}
+
+	for (i = 0; i < enic->rq_count; i++) {
+		error_status = vnic_rq_error_status(&enic->rq[i]);
+		if (error_status)
+			printk(KERN_ERR PFX "%s: RQ[%d] error_status %d\n",
+				enic->netdev->name, i, error_status);
+	}
+}
+
+static void enic_link_check(struct enic *enic)
+{
+	int link_status = vnic_dev_link_status(enic->vdev);
+	int carrier_ok = netif_carrier_ok(enic->netdev);
+
+	if (link_status && !carrier_ok) {
+		printk(KERN_INFO PFX "%s: Link UP\n", enic->netdev->name);
+		netif_carrier_on(enic->netdev);
+	} else if (!link_status && carrier_ok) {
+		printk(KERN_INFO PFX "%s: Link DOWN\n", enic->netdev->name);
+		netif_carrier_off(enic->netdev);
+	}
+}
+
+static void enic_mtu_check(struct enic *enic)
+{
+	u32 mtu = vnic_dev_mtu(enic->vdev);
+
+	if (mtu != enic->port_mtu) {
+		if (mtu < enic->netdev->mtu)
+			printk(KERN_WARNING PFX
+				"%s: interface MTU (%d) set higher "
+				"than switch port MTU (%d)\n",
+				enic->netdev->name, enic->netdev->mtu, mtu);
+		enic->port_mtu = mtu;
+	}
+}
+
+static void enic_msglvl_check(struct enic *enic)
+{
+	u32 msg_enable = vnic_dev_msg_lvl(enic->vdev);
+
+	if (msg_enable != enic->msg_enable) {
+		printk(KERN_INFO PFX "%s: msg lvl changed from 0x%x to 0x%x\n",
+			enic->netdev->name, enic->msg_enable, msg_enable);
+		enic->msg_enable = msg_enable;
+	}
+}
+
+static void enic_notify_check(struct enic *enic)
+{
+	enic_msglvl_check(enic);
+	enic_mtu_check(enic);
+	enic_link_check(enic);
+}
+
+#define ENIC_TEST_INTR(pba, i) (pba & (1 << i))
+
+static irqreturn_t enic_isr_legacy(int irq, void *data)
+{
+	struct net_device *netdev = data;
+	struct enic *enic = netdev_priv(netdev);
+	u32 pba;
+
+	vnic_intr_mask(&enic->intr[ENIC_INTX_WQ_RQ]);
+
+	pba = vnic_intr_legacy_pba(enic->legacy_pba);
+	if (!pba) {
+		vnic_intr_unmask(&enic->intr[ENIC_INTX_WQ_RQ]);
+		return IRQ_NONE;	/* not our interrupt */
+	}
+
+	if (ENIC_TEST_INTR(pba, ENIC_INTX_NOTIFY))
+		enic_notify_check(enic);
+
+	if (ENIC_TEST_INTR(pba, ENIC_INTX_ERR)) {
+		enic_log_q_error(enic);
+		/* schedule recovery from WQ/RQ error */
+		schedule_work(&enic->reset);
+		return IRQ_HANDLED;
+	}
+
+	if (ENIC_TEST_INTR(pba, ENIC_INTX_WQ_RQ)) {
+		if (netif_rx_schedule_prep(netdev, &enic->napi))
+			__netif_rx_schedule(netdev, &enic->napi);
+	} else {
+		vnic_intr_unmask(&enic->intr[ENIC_INTX_WQ_RQ]);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t enic_isr_msi(int irq, void *data)
+{
+	struct enic *enic = data;
+
+	/* With MSI, there is no sharing of interrupts, so this is
+	 * our interrupt and there is no need to ack it.  The device
+	 * is not providing per-vector masking, so the OS will not
+	 * write to PCI config space to mask/unmask the interrupt.
+	 * We're using mask_on_assertion for MSI, so the device
+	 * automatically masks the interrupt when the interrupt is
+	 * generated.  Later, when exiting polling, the interrupt
+	 * will be unmasked (see enic_poll).
+	 *
+	 * Also, the device uses the same PCIe Traffic Class (TC)
+	 * for Memory Write data and MSI, so there are no ordering
+	 * issues; the MSI will always arrive at the Root Complex
+	 * _after_ corresponding Memory Writes (i.e. descriptor
+	 * writes).
+	 */
+
+	netif_rx_schedule(enic->netdev, &enic->napi);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t enic_isr_msix_rq(int irq, void *data)
+{
+	struct enic *enic = data;
+
+	/* schedule NAPI polling for RQ cleanup */
+	netif_rx_schedule(enic->netdev, &enic->napi);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t enic_isr_msix_wq(int irq, void *data)
+{
+	struct enic *enic = data;
+	unsigned int wq_work_to_do = -1; /* no limit */
+	unsigned int wq_work_done;
+
+	wq_work_done = vnic_cq_service(&enic->cq[ENIC_CQ_WQ],
+		wq_work_to_do, enic_wq_service, NULL);
+
+	vnic_intr_return_credits(&enic->intr[ENIC_MSIX_WQ],
+		wq_work_done,
+		1 /* unmask intr */,
+		1 /* reset intr timer */);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t enic_isr_msix_err(int irq, void *data)
+{
+	struct enic *enic = data;
+
+	enic_log_q_error(enic);
+
+	/* schedule recovery from WQ/RQ error */
+	schedule_work(&enic->reset);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t enic_isr_msix_notify(int irq, void *data)
+{
+	struct enic *enic = data;
+
+	enic_notify_check(enic);
+	vnic_intr_unmask(&enic->intr[ENIC_MSIX_NOTIFY]);
+
+	return IRQ_HANDLED;
+}
+
+static inline void enic_queue_wq_skb_cont(struct enic *enic,
+	struct vnic_wq *wq, struct sk_buff *skb,
+	unsigned int len_left)
+{
+	skb_frag_t *frag;
+
+	/* Queue additional data fragments */
+	for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
+		len_left -= frag->size;
+		enic_queue_wq_desc_cont(wq, skb,
+			pci_map_page(enic->pdev, frag->page,
+				frag->page_offset, frag->size,
+				PCI_DMA_TODEVICE),
+			frag->size,
+			(len_left == 0));	/* EOP? */
+	}
+}
+
+static inline void enic_queue_wq_skb_vlan(struct enic *enic,
+	struct vnic_wq *wq, struct sk_buff *skb,
+	int vlan_tag_insert, unsigned int vlan_tag)
+{
+	unsigned int head_len = skb_headlen(skb);
+	unsigned int len_left = skb->len - head_len;
+	int eop = (len_left == 0);
+
+	/* Queue the main skb fragment */
+	enic_queue_wq_desc(wq, skb,
+		pci_map_single(enic->pdev, skb->data,
+			head_len, PCI_DMA_TODEVICE),
+		head_len,
+		vlan_tag_insert, vlan_tag,
+		eop);
+
+	if (!eop)
+		enic_queue_wq_skb_cont(enic, wq, skb, len_left);
+}
+
+static inline void enic_queue_wq_skb_csum_l4(struct enic *enic,
+	struct vnic_wq *wq, struct sk_buff *skb,
+	int vlan_tag_insert, unsigned int vlan_tag)
+{
+	unsigned int head_len = skb_headlen(skb);
+	unsigned int len_left = skb->len - head_len;
+	unsigned int hdr_len = skb_transport_offset(skb);
+	unsigned int csum_offset = hdr_len + skb->csum_offset;
+	int eop = (len_left == 0);
+
+	/* Queue the main skb fragment */
+	enic_queue_wq_desc_csum_l4(wq, skb,
+		pci_map_single(enic->pdev, skb->data,
+			head_len, PCI_DMA_TODEVICE),
+		head_len,
+		csum_offset,
+		hdr_len,
+		vlan_tag_insert, vlan_tag,
+		eop);
+
+	if (!eop)
+		enic_queue_wq_skb_cont(enic, wq, skb, len_left);
+}
+
+static inline void enic_queue_wq_skb_tso(struct enic *enic,
+	struct vnic_wq *wq, struct sk_buff *skb, unsigned int mss,
+	int vlan_tag_insert, unsigned int vlan_tag)
+{
+	unsigned int head_len = skb_headlen(skb);
+	unsigned int len_left = skb->len - head_len;
+	unsigned int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
+	int eop = (len_left == 0);
+
+	/* Preload TCP csum field with IP pseudo hdr calculated
+	 * with IP length set to zero.  HW will later add in length
+	 * to each TCP segment resulting from the TSO.
+	 */
+
+	if (skb->protocol == __constant_htons(ETH_P_IP)) {
+		ip_hdr(skb)->check = 0;
+		tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
+			ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
+	} else if (skb->protocol == __constant_htons(ETH_P_IPV6)) {
+		tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+			&ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
+	}
+
+	/* Queue the main skb fragment */
+	enic_queue_wq_desc_tso(wq, skb,
+		pci_map_single(enic->pdev, skb->data,
+			head_len, PCI_DMA_TODEVICE),
+		head_len,
+		mss, hdr_len,
+		vlan_tag_insert, vlan_tag,
+		eop);
+
+	if (!eop)
+		enic_queue_wq_skb_cont(enic, wq, skb, len_left);
+}
+
+static inline void enic_queue_wq_skb(struct enic *enic,
+	struct vnic_wq *wq, struct sk_buff *skb)
+{
+	unsigned int mss = skb_shinfo(skb)->gso_size;
+	unsigned int vlan_tag = 0;
+	int vlan_tag_insert = 0;
+
+	if (enic->vlan_group && vlan_tx_tag_present(skb)) {
+		/* VLAN tag from trunking driver */
+		vlan_tag_insert = 1;
+		vlan_tag = vlan_tx_tag_get(skb);
+	}
+
+	if (mss)
+		enic_queue_wq_skb_tso(enic, wq, skb, mss,
+			vlan_tag_insert, vlan_tag);
+	else if	(skb->ip_summed == CHECKSUM_PARTIAL)
+		enic_queue_wq_skb_csum_l4(enic, wq, skb,
+			vlan_tag_insert, vlan_tag);
+	else
+		enic_queue_wq_skb_vlan(enic, wq, skb,
+			vlan_tag_insert, vlan_tag);
+}
+
+/* netif_tx_lock held, process context with BHs disabled */
+static int enic_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev)
+{
+	struct enic *enic = netdev_priv(netdev);
+	struct vnic_wq *wq = &enic->wq[0];
+	unsigned long flags;
+
+	if (skb->len <= 0) {
+		dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+
+	/* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs,
+	 * which is very likely.  In the off chance it's going to take
+	 * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb.
+	 */
+
+	if (skb_shinfo(skb)->gso_size == 0 &&
+	    skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
+	    skb_linearize(skb)) {
+		dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+
+	spin_lock_irqsave(&enic->wq_lock[0], flags);
+
+	if (vnic_wq_desc_avail(wq) < skb_shinfo(skb)->nr_frags + 1) {
+		netif_stop_queue(netdev);
+		/* This is a hard error, log it */
+		printk(KERN_ERR PFX "%s: BUG! Tx ring full when "
+			"queue awake!\n", netdev->name);
+		spin_unlock_irqrestore(&enic->wq_lock[0], flags);
+		return NETDEV_TX_BUSY;
+	}
+
+	enic_queue_wq_skb(enic, wq, skb);
+
+	if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + 1)
+		netif_stop_queue(netdev);
+
+	netdev->trans_start = jiffies;
+
+	spin_unlock_irqrestore(&enic->wq_lock[0], flags);
+
+	return NETDEV_TX_OK;
+}
+
+/* dev_base_lock rwlock held, nominally process context */
+static struct net_device_stats *enic_get_stats(struct net_device *netdev)
+{
+	struct enic *enic = netdev_priv(netdev);
+	struct vnic_stats *stats;
+
+	spin_lock(&enic->devcmd_lock);
+	vnic_dev_stats_dump(enic->vdev, &stats);
+	spin_unlock(&enic->devcmd_lock);
+
+	enic->net_stats.tx_packets = stats->tx.tx_frames_ok;
+	enic->net_stats.tx_bytes = stats->tx.tx_bytes_ok;
+	enic->net_stats.tx_errors = stats->tx.tx_errors;
+	enic->net_stats.tx_dropped = stats->tx.tx_drops;
+
+	enic->net_stats.rx_packets = stats->rx.rx_frames_ok;
+	enic->net_stats.rx_bytes = stats->rx.rx_bytes_ok;
+	enic->net_stats.rx_errors = stats->rx.rx_errors;
+	enic->net_stats.multicast = stats->rx.rx_multicast_frames_ok;
+	enic->net_stats.rx_crc_errors = stats->rx.rx_crc_errors;
+	enic->net_stats.rx_dropped = stats->rx.rx_no_bufs;
+
+	return &enic->net_stats;
+}
+
+static void enic_reset_mcaddrs(struct enic *enic)
+{
+	enic->mc_count = 0;
+}
+
+static int enic_set_mac_addr(struct net_device *netdev, char *addr)
+{
+	if (!is_valid_ether_addr(addr))
+		return -EADDRNOTAVAIL;
+
+	memcpy(netdev->dev_addr, addr, netdev->addr_len);
+
+	return 0;
+}
+
+/* netif_tx_lock held, BHs disabled */
+static void enic_set_multicast_list(struct net_device *netdev)
+{
+	struct enic *enic = netdev_priv(netdev);
+	struct dev_mc_list *list = netdev->mc_list;
+	int directed = 1;
+	int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0;
+	int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0;
+	int promisc = (netdev->flags & IFF_PROMISC) ? 1 : 0;
+	int allmulti = (netdev->flags & IFF_ALLMULTI) ||
+	    (netdev->mc_count > ENIC_MULTICAST_PERFECT_FILTERS);
+	u8 mc_addr[ENIC_MULTICAST_PERFECT_FILTERS][ETH_ALEN];
+	unsigned int mc_count = netdev->mc_count;
+	unsigned int i, j;
+
+	if (mc_count > ENIC_MULTICAST_PERFECT_FILTERS)
+		mc_count = ENIC_MULTICAST_PERFECT_FILTERS;
+
+	spin_lock(&enic->devcmd_lock);
+
+	vnic_dev_packet_filter(enic->vdev, directed,
+		multicast, broadcast, promisc, allmulti);
+
+	/* Is there an easier way?  Trying to minimize to
+	 * calls to add/del multicast addrs.  We keep the
+	 * addrs from the last call in enic->mc_addr and
+	 * look for changes to add/del.
+	 */
+
+	for (i = 0; list && i < mc_count; i++) {
+		memcpy(mc_addr[i], list->dmi_addr, ETH_ALEN);
+		list = list->next;
+	}
+
+	for (i = 0; i < enic->mc_count; i++) {
+		for (j = 0; j < mc_count; j++)
+			if (compare_ether_addr(enic->mc_addr[i],
+				mc_addr[j]) == 0)
+				break;
+		if (j == mc_count)
+			enic_del_multicast_addr(enic, enic->mc_addr[i]);
+	}
+
+	for (i = 0; i < mc_count; i++) {
+		for (j = 0; j < enic->mc_count; j++)
+			if (compare_ether_addr(mc_addr[i],
+				enic->mc_addr[j]) == 0)
+				break;
+		if (j == enic->mc_count)
+			enic_add_multicast_addr(enic, mc_addr[i]);
+	}
+
+	/* Save the list to compare against next time
+	 */
+
+	for (i = 0; i < mc_count; i++)
+		memcpy(enic->mc_addr[i], mc_addr[i], ETH_ALEN);
+
+	enic->mc_count = mc_count;
+
+	spin_unlock(&enic->devcmd_lock);
+}
+
+/* rtnl lock is held */
+static void enic_vlan_rx_register(struct net_device *netdev,
+	struct vlan_group *vlan_group)
+{
+	struct enic *enic = netdev_priv(netdev);
+	enic->vlan_group = vlan_group;
+}
+
+/* rtnl lock is held */
+static void enic_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
+{
+	struct enic *enic = netdev_priv(netdev);
+
+	spin_lock(&enic->devcmd_lock);
+	enic_add_vlan(enic, vid);
+	spin_unlock(&enic->devcmd_lock);
+}
+
+/* rtnl lock is held */
+static void enic_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
+{
+	struct enic *enic = netdev_priv(netdev);
+
+	spin_lock(&enic->devcmd_lock);
+	enic_del_vlan(enic, vid);
+	spin_unlock(&enic->devcmd_lock);
+}
+
+/* netif_tx_lock held, BHs disabled */
+static void enic_tx_timeout(struct net_device *netdev)
+{
+	struct enic *enic = netdev_priv(netdev);
+	schedule_work(&enic->reset);
+}
+
+static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
+{
+	struct enic *enic = vnic_dev_priv(rq->vdev);
+
+	if (!buf->os_buf)
+		return;
+
+	pci_unmap_single(enic->pdev, buf->dma_addr,
+		buf->len, PCI_DMA_FROMDEVICE);
+	dev_kfree_skb_any(buf->os_buf);
+}
+
+static inline struct sk_buff *enic_rq_alloc_skb(unsigned int size)
+{
+	struct sk_buff *skb;
+
+	skb = dev_alloc_skb(size + NET_IP_ALIGN);
+
+	if (skb)
+		skb_reserve(skb, NET_IP_ALIGN);
+
+	return skb;
+}
+
+static int enic_rq_alloc_buf(struct vnic_rq *rq)
+{
+	struct enic *enic = vnic_dev_priv(rq->vdev);
+	struct sk_buff *skb;
+	unsigned int len = enic->netdev->mtu + ETH_HLEN;
+	unsigned int os_buf_index = 0;
+	dma_addr_t dma_addr;
+
+	skb = enic_rq_alloc_skb(len);
+	if (!skb)
+		return -ENOMEM;
+
+	dma_addr = pci_map_single(enic->pdev, skb->data,
+		len, PCI_DMA_FROMDEVICE);
+
+	enic_queue_rq_desc(rq, skb, os_buf_index,
+		dma_addr, len);
+
+	return 0;
+}
+
+static int enic_get_skb_header(struct sk_buff *skb, void **iphdr,
+	void **tcph, u64 *hdr_flags, void *priv)
+{
+	struct cq_enet_rq_desc *cq_desc = priv;
+	unsigned int ip_len;
+	struct iphdr *iph;
+
+	u8 type, color, eop, sop, ingress_port, vlan_stripped;
+	u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
+	u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
+	u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
+	u8 packet_error;
+	u16 q_number, completed_index, bytes_written, vlan, checksum;
+	u32 rss_hash;
+
+	cq_enet_rq_desc_dec(cq_desc,
+		&type, &color, &q_number, &completed_index,
+		&ingress_port, &fcoe, &eop, &sop, &rss_type,
+		&csum_not_calc, &rss_hash, &bytes_written,
+		&packet_error, &vlan_stripped, &vlan, &checksum,
+		&fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
+		&fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
+		&ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
+		&fcs_ok);
+
+	if (!(ipv4 && tcp && !ipv4_fragment))
+		return -1;
+
+	skb_reset_network_header(skb);
+	iph = ip_hdr(skb);
+
+	ip_len = ip_hdrlen(skb);
+	skb_set_transport_header(skb, ip_len);
+
+	/* check if ip header and tcp header are complete */
+	if (ntohs(iph->tot_len) < ip_len + tcp_hdrlen(skb))
+		return -1;
+
+	*hdr_flags = LRO_IPV4 | LRO_TCP;
+	*tcph = tcp_hdr(skb);
+	*iphdr = iph;
+
+	return 0;
+}
+
+static void enic_rq_indicate_buf(struct vnic_rq *rq,
+	struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
+	int skipped, void *opaque)
+{
+	struct enic *enic = vnic_dev_priv(rq->vdev);
+	struct sk_buff *skb;
+
+	u8 type, color, eop, sop, ingress_port, vlan_stripped;
+	u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
+	u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
+	u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
+	u8 packet_error;
+	u16 q_number, completed_index, bytes_written, vlan, checksum;
+	u32 rss_hash;
+
+	if (skipped)
+		return;
+
+	skb = buf->os_buf;
+	prefetch(skb->data - NET_IP_ALIGN);
+	pci_unmap_single(enic->pdev, buf->dma_addr,
+		buf->len, PCI_DMA_FROMDEVICE);
+
+	cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
+		&type, &color, &q_number, &completed_index,
+		&ingress_port, &fcoe, &eop, &sop, &rss_type,
+		&csum_not_calc, &rss_hash, &bytes_written,
+		&packet_error, &vlan_stripped, &vlan, &checksum,
+		&fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
+		&fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
+		&ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
+		&fcs_ok);
+
+	if (packet_error) {
+
+		if (bytes_written > 0 && !fcs_ok) {
+			if (net_ratelimit())
+				printk(KERN_ERR PFX
+					"%s: packet error: bad FCS\n",
+					enic->netdev->name);
+		}
+
+		dev_kfree_skb_any(skb);
+
+		return;
+	}
+
+	if (eop && bytes_written > 0) {
+
+		/* Good receive
+		 */
+
+		skb_put(skb, bytes_written);
+		skb->protocol = eth_type_trans(skb, enic->netdev);
+
+		if (enic->csum_rx_enabled && !csum_not_calc) {
+			skb->csum = htons(checksum);
+			skb->ip_summed = CHECKSUM_COMPLETE;
+		}
+
+		skb->dev = enic->netdev;
+		enic->netdev->last_rx = jiffies;
+
+		if (enic->vlan_group && vlan_stripped) {
+
+			if (ENIC_SETTING(enic, LRO))
+				lro_vlan_hwaccel_receive_skb(&enic->lro_mgr,
+					skb, enic->vlan_group,
+					vlan, cq_desc);
+			else
+				vlan_hwaccel_receive_skb(skb,
+					enic->vlan_group, vlan);
+
+		} else {
+
+			if (ENIC_SETTING(enic, LRO))
+				lro_receive_skb(&enic->lro_mgr, skb, cq_desc);
+			else
+				netif_receive_skb(skb);
+
+		}
+
+	} else {
+
+		/* Buffer overflow
+		 */
+
+		dev_kfree_skb_any(skb);
+	}
+}
+
+static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
+	u8 type, u16 q_number, u16 completed_index, void *opaque)
+{
+	struct enic *enic = vnic_dev_priv(vdev);
+
+	vnic_rq_service(&enic->rq[q_number], cq_desc,
+		completed_index, VNIC_RQ_RETURN_DESC,
+		enic_rq_indicate_buf, opaque);
+
+	return 0;
+}
+
+static void enic_rq_drop_buf(struct vnic_rq *rq,
+	struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
+	int skipped, void *opaque)
+{
+	struct enic *enic = vnic_dev_priv(rq->vdev);
+	struct sk_buff *skb = buf->os_buf;
+
+	if (skipped)
+		return;
+
+	pci_unmap_single(enic->pdev, buf->dma_addr,
+		buf->len, PCI_DMA_FROMDEVICE);
+
+	dev_kfree_skb_any(skb);
+}
+
+static int enic_rq_service_drop(struct vnic_dev *vdev, struct cq_desc *cq_desc,
+	u8 type, u16 q_number, u16 completed_index, void *opaque)
+{
+	struct enic *enic = vnic_dev_priv(vdev);
+
+	vnic_rq_service(&enic->rq[q_number], cq_desc,
+		completed_index, VNIC_RQ_RETURN_DESC,
+		enic_rq_drop_buf, opaque);
+
+	return 0;
+}
+
+static int enic_poll(struct napi_struct *napi, int budget)
+{
+	struct enic *enic = container_of(napi, struct enic, napi);
+	struct net_device *netdev = enic->netdev;
+	unsigned int rq_work_to_do = budget;
+	unsigned int wq_work_to_do = -1; /* no limit */
+	unsigned int  work_done, rq_work_done, wq_work_done;
+
+	/* Service RQ (first) and WQ
+	 */
+
+	rq_work_done = vnic_cq_service(&enic->cq[ENIC_CQ_RQ],
+		rq_work_to_do, enic_rq_service, NULL);
+
+	wq_work_done = vnic_cq_service(&enic->cq[ENIC_CQ_WQ],
+		wq_work_to_do, enic_wq_service, NULL);
+
+	/* Accumulate intr event credits for this polling
+	 * cycle.  An intr event is the completion of a
+	 * a WQ or RQ packet.
+	 */
+
+	work_done = rq_work_done + wq_work_done;
+
+	if (work_done > 0)
+		vnic_intr_return_credits(&enic->intr[ENIC_INTX_WQ_RQ],
+			work_done,
+			0 /* don't unmask intr */,
+			0 /* don't reset intr timer */);
+
+	if (rq_work_done > 0) {
+
+		/* Replenish RQ
+		 */
+
+		vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
+
+	} else {
+
+		/* If no work done, flush all LROs and exit polling
+		 */
+
+		if (ENIC_SETTING(enic, LRO))
+			lro_flush_all(&enic->lro_mgr);
+
+		netif_rx_complete(netdev, napi);
+		vnic_intr_unmask(&enic->intr[ENIC_MSIX_RQ]);
+	}
+
+	return rq_work_done;
+}
+
+static int enic_poll_msix(struct napi_struct *napi, int budget)
+{
+	struct enic *enic = container_of(napi, struct enic, napi);
+	struct net_device *netdev = enic->netdev;
+	unsigned int work_to_do = budget;
+	unsigned int work_done;
+
+	/* Service RQ
+	 */
+
+	work_done = vnic_cq_service(&enic->cq[ENIC_CQ_RQ],
+		work_to_do, enic_rq_service, NULL);
+
+	if (work_done > 0) {
+
+		/* Replenish RQ
+		 */
+
+		vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
+
+		/* Accumulate intr event credits for this polling
+		 * cycle.  An intr event is the completion of a
+		 * a WQ or RQ packet.
+		 */
+
+		vnic_intr_return_credits(&enic->intr[ENIC_MSIX_RQ],
+			work_done,
+			0 /* don't unmask intr */,
+			0 /* don't reset intr timer */);
+	} else {
+
+		/* If no work done, flush all LROs and exit polling
+		 */
+
+		if (ENIC_SETTING(enic, LRO))
+			lro_flush_all(&enic->lro_mgr);
+
+		netif_rx_complete(netdev, napi);
+		vnic_intr_unmask(&enic->intr[ENIC_MSIX_RQ]);
+	}
+
+	return work_done;
+}
+
+static void enic_notify_timer(unsigned long data)
+{
+	struct enic *enic = (struct enic *)data;
+
+	enic_notify_check(enic);
+
+	mod_timer(&enic->notify_timer, round_jiffies(ENIC_NOTIFY_TIMER_PERIOD));
+}
+
+static void enic_free_intr(struct enic *enic)
+{
+	struct net_device *netdev = enic->netdev;
+	unsigned int i;
+
+	switch (vnic_dev_get_intr_mode(enic->vdev)) {
+	case VNIC_DEV_INTR_MODE_INTX:
+	case VNIC_DEV_INTR_MODE_MSI:
+		free_irq(enic->pdev->irq, netdev);
+		break;
+	case VNIC_DEV_INTR_MODE_MSIX:
+		for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
+			if (enic->msix[i].requested)
+				free_irq(enic->msix_entry[i].vector,
+					enic->msix[i].devid);
+		break;
+	default:
+		break;
+	}
+}
+
+static int enic_request_intr(struct enic *enic)
+{
+	struct net_device *netdev = enic->netdev;
+	unsigned int i;
+	int err = 0;
+
+	switch (vnic_dev_get_intr_mode(enic->vdev)) {
+
+	case VNIC_DEV_INTR_MODE_INTX:
+
+		err = request_irq(enic->pdev->irq, enic_isr_legacy,
+			IRQF_SHARED, netdev->name, netdev);
+		break;
+
+	case VNIC_DEV_INTR_MODE_MSI:
+
+		err = request_irq(enic->pdev->irq, enic_isr_msi,
+			0, netdev->name, enic);
+		break;
+
+	case VNIC_DEV_INTR_MODE_MSIX:
+
+		sprintf(enic->msix[ENIC_MSIX_RQ].devname,
+			"%.11s-rx", netdev->name);
+		enic->msix[ENIC_MSIX_RQ].isr = enic_isr_msix_rq;
+		enic->msix[ENIC_MSIX_RQ].devid = enic;
+
+		sprintf(enic->msix[ENIC_MSIX_WQ].devname,
+			"%.11s-tx", net