cxgb4vf: Add main T4 PCI-E SR-IOV Virtual Function driver for cxgb4vf

Add main T4 PCI-E SR-IOV Virtual Function driver for "cxgb4vf".

Signed-off-by: Casey Leedom
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2906 insertions, 0 deletions

diff --git a/drivers/net/cxgb4vf/cxgb4vf_main.c b/drivers/net/cxgb4vf/cxgb4vf_main.c
new file mode 100644
index 000000000000..bd73ff5b51b7
--- /dev/null
+++ b/drivers/net/cxgb4vf/cxgb4vf_main.c
@@ -0,0 +1,2906 @@
+/*
+ * This file is part of the Chelsio T4 PCI-E SR-IOV Virtual Function Ethernet
+ * driver for Linux.
+ *
+ * Copyright (c) 2009-2010 Chelsio Communications, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * 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/version.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/debugfs.h>
+#include <linux/ethtool.h>
+
+#include "t4vf_common.h"
+#include "t4vf_defs.h"
+
+#include "../cxgb4/t4_regs.h"
+#include "../cxgb4/t4_msg.h"
+
+/*
+ * Generic information about the driver.
+ */
+#define DRV_VERSION "1.0.0"
+#define DRV_DESC "Chelsio T4 Virtual Function (VF) Network Driver"
+
+/*
+ * Module Parameters.
+ * ==================
+ */
+
+/*
+ * Default ethtool "message level" for adapters.
+ */
+#define DFLT_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK | \
+			 NETIF_MSG_TIMER | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP |\
+			 NETIF_MSG_RX_ERR | NETIF_MSG_TX_ERR)
+
+static int dflt_msg_enable = DFLT_MSG_ENABLE;
+
+module_param(dflt_msg_enable, int, 0644);
+MODULE_PARM_DESC(dflt_msg_enable,
+		 "default adapter ethtool message level bitmap");
+
+/*
+ * The driver uses the best interrupt scheme available on a platform in the
+ * order MSI-X then MSI.  This parameter determines which of these schemes the
+ * driver may consider as follows:
+ *
+ *     msi = 2: choose from among MSI-X and MSI
+ *     msi = 1: only consider MSI interrupts
+ *
+ * Note that unlike the Physical Function driver, this Virtual Function driver
+ * does _not_ support legacy INTx interrupts (this limitation is mandated by
+ * the PCI-E SR-IOV standard).
+ */
+#define MSI_MSIX	2
+#define MSI_MSI		1
+#define MSI_DEFAULT	MSI_MSIX
+
+static int msi = MSI_DEFAULT;
+
+module_param(msi, int, 0644);
+MODULE_PARM_DESC(msi, "whether to use MSI-X or MSI");
+
+/*
+ * Fundamental constants.
+ * ======================
+ */
+
+enum {
+	MAX_TXQ_ENTRIES		= 16384,
+	MAX_RSPQ_ENTRIES	= 16384,
+	MAX_RX_BUFFERS		= 16384,
+
+	MIN_TXQ_ENTRIES		= 32,
+	MIN_RSPQ_ENTRIES	= 128,
+	MIN_FL_ENTRIES		= 16,
+
+	/*
+	 * For purposes of manipulating the Free List size we need to
+	 * recognize that Free Lists are actually Egress Queues (the host
+	 * produces free buffers which the hardware consumes), Egress Queues
+	 * indices are all in units of Egress Context Units bytes, and free
+	 * list entries are 64-bit PCI DMA addresses.  And since the state of
+	 * the Producer Index == the Consumer Index implies an EMPTY list, we
+	 * always have at least one Egress Unit's worth of Free List entries
+	 * unused.  See sge.c for more details ...
+	 */
+	EQ_UNIT = SGE_EQ_IDXSIZE,
+	FL_PER_EQ_UNIT = EQ_UNIT / sizeof(__be64),
+	MIN_FL_RESID = FL_PER_EQ_UNIT,
+};
+
+/*
+ * Global driver state.
+ * ====================
+ */
+
+static struct dentry *cxgb4vf_debugfs_root;
+
+/*
+ * OS "Callback" functions.
+ * ========================
+ */
+
+/*
+ * The link status has changed on the indicated "port" (Virtual Interface).
+ */
+void t4vf_os_link_changed(struct adapter *adapter, int pidx, int link_ok)
+{
+	struct net_device *dev = adapter->port[pidx];
+
+	/*
+	 * If the port is disabled or the current recorded "link up"
+	 * status matches the new status, just return.
+	 */
+	if (!netif_running(dev) || link_ok == netif_carrier_ok(dev))
+		return;
+
+	/*
+	 * Tell the OS that the link status has changed and print a short
+	 * informative message on the console about the event.
+	 */
+	if (link_ok) {
+		const char *s;
+		const char *fc;
+		const struct port_info *pi = netdev_priv(dev);
+
+		netif_carrier_on(dev);
+
+		switch (pi->link_cfg.speed) {
+		case SPEED_10000:
+			s = "10Gbps";
+			break;
+
+		case SPEED_1000:
+			s = "1000Mbps";
+			break;
+
+		case SPEED_100:
+			s = "100Mbps";
+			break;
+
+		default:
+			s = "unknown";
+			break;
+		}
+
+		switch (pi->link_cfg.fc) {
+		case PAUSE_RX:
+			fc = "RX";
+			break;
+
+		case PAUSE_TX:
+			fc = "TX";
+			break;
+
+		case PAUSE_RX|PAUSE_TX:
+			fc = "RX/TX";
+			break;
+
+		default:
+			fc = "no";
+			break;
+		}
+
+		printk(KERN_INFO "%s: link up, %s, full-duplex, %s PAUSE\n",
+		       dev->name, s, fc);
+	} else {
+		netif_carrier_off(dev);
+		printk(KERN_INFO "%s: link down\n", dev->name);
+	}
+}
+
+/*
+ * Net device operations.
+ * ======================
+ */
+
+/*
+ * Record our new VLAN Group and enable/disable hardware VLAN Tag extraction
+ * based on whether the specified VLAN Group pointer is NULL or not.
+ */
+static void cxgb4vf_vlan_rx_register(struct net_device *dev,
+				     struct vlan_group *grp)
+{
+	struct port_info *pi = netdev_priv(dev);
+
+	pi->vlan_grp = grp;
+	t4vf_set_rxmode(pi->adapter, pi->viid, -1, -1, -1, -1, grp != NULL, 0);
+}
+
+/*
+ * Perform the MAC and PHY actions needed to enable a "port" (Virtual
+ * Interface).
+ */
+static int link_start(struct net_device *dev)
+{
+	int ret;
+	struct port_info *pi = netdev_priv(dev);
+
+	/*
+	 * We do not set address filters and promiscuity here, the stack does
+	 * that step explicitly.
+	 */
+	ret = t4vf_set_rxmode(pi->adapter, pi->viid, dev->mtu, -1, -1, -1, -1,
+			      true);
+	if (ret == 0) {
+		ret = t4vf_change_mac(pi->adapter, pi->viid,
+				      pi->xact_addr_filt, dev->dev_addr, true);
+		if (ret >= 0) {
+			pi->xact_addr_filt = ret;
+			ret = 0;
+		}
+	}
+
+	/*
+	 * We don't need to actually "start the link" itself since the
+	 * firmware will do that for us when the first Virtual Interface
+	 * is enabled on a port.
+	 */
+	if (ret == 0)
+		ret = t4vf_enable_vi(pi->adapter, pi->viid, true, true);
+	return ret;
+}
+
+/*
+ * Name the MSI-X interrupts.
+ */
+static void name_msix_vecs(struct adapter *adapter)
+{
+	int namelen = sizeof(adapter->msix_info[0].desc) - 1;
+	int pidx;
+
+	/*
+	 * Firmware events.
+	 */
+	snprintf(adapter->msix_info[MSIX_FW].desc, namelen,
+		 "%s-FWeventq", adapter->name);
+	adapter->msix_info[MSIX_FW].desc[namelen] = 0;
+
+	/*
+	 * Ethernet queues.
+	 */
+	for_each_port(adapter, pidx) {
+		struct net_device *dev = adapter->port[pidx];
+		const struct port_info *pi = netdev_priv(dev);
+		int qs, msi;
+
+		for (qs = 0, msi = MSIX_NIQFLINT;
+		     qs < pi->nqsets;
+		     qs++, msi++) {
+			snprintf(adapter->msix_info[msi].desc, namelen,
+				 "%s-%d", dev->name, qs);
+			adapter->msix_info[msi].desc[namelen] = 0;
+		}
+	}
+}
+
+/*
+ * Request all of our MSI-X resources.
+ */
+static int request_msix_queue_irqs(struct adapter *adapter)
+{
+	struct sge *s = &adapter->sge;
+	int rxq, msi, err;
+
+	/*
+	 * Firmware events.
+	 */
+	err = request_irq(adapter->msix_info[MSIX_FW].vec, t4vf_sge_intr_msix,
+			  0, adapter->msix_info[MSIX_FW].desc, &s->fw_evtq);
+	if (err)
+		return err;
+
+	/*
+	 * Ethernet queues.
+	 */
+	msi = MSIX_NIQFLINT;
+	for_each_ethrxq(s, rxq) {
+		err = request_irq(adapter->msix_info[msi].vec,
+				  t4vf_sge_intr_msix, 0,
+				  adapter->msix_info[msi].desc,
+				  &s->ethrxq[rxq].rspq);
+		if (err)
+			goto err_free_irqs;
+		msi++;
+	}
+	return 0;
+
+err_free_irqs:
+	while (--rxq >= 0)
+		free_irq(adapter->msix_info[--msi].vec, &s->ethrxq[rxq].rspq);
+	free_irq(adapter->msix_info[MSIX_FW].vec, &s->fw_evtq);
+	return err;
+}
+
+/*
+ * Free our MSI-X resources.
+ */
+static void free_msix_queue_irqs(struct adapter *adapter)
+{
+	struct sge *s = &adapter->sge;
+	int rxq, msi;
+
+	free_irq(adapter->msix_info[MSIX_FW].vec, &s->fw_evtq);
+	msi = MSIX_NIQFLINT;
+	for_each_ethrxq(s, rxq)
+		free_irq(adapter->msix_info[msi++].vec,
+			 &s->ethrxq[rxq].rspq);
+}
+
+/*
+ * Turn on NAPI and start up interrupts on a response queue.
+ */
+static void qenable(struct sge_rspq *rspq)
+{
+	napi_enable(&rspq->napi);
+
+	/*
+	 * 0-increment the Going To Sleep register to start the timer and
+	 * enable interrupts.
+	 */
+	t4_write_reg(rspq->adapter, T4VF_SGE_BASE_ADDR + SGE_VF_GTS,
+		     CIDXINC(0) |
+		     SEINTARM(rspq->intr_params) |
+		     INGRESSQID(rspq->cntxt_id));
+}
+
+/*
+ * Enable NAPI scheduling and interrupt generation for all Receive Queues.
+ */
+static void enable_rx(struct adapter *adapter)
+{
+	int rxq;
+	struct sge *s = &adapter->sge;
+
+	for_each_ethrxq(s, rxq)
+		qenable(&s->ethrxq[rxq].rspq);
+	qenable(&s->fw_evtq);
+
+	/*
+	 * The interrupt queue doesn't use NAPI so we do the 0-increment of
+	 * its Going To Sleep register here to get it started.
+	 */
+	if (adapter->flags & USING_MSI)
+		t4_write_reg(adapter, T4VF_SGE_BASE_ADDR + SGE_VF_GTS,
+			     CIDXINC(0) |
+			     SEINTARM(s->intrq.intr_params) |
+			     INGRESSQID(s->intrq.cntxt_id));
+
+}
+
+/*
+ * Wait until all NAPI handlers are descheduled.
+ */
+static void quiesce_rx(struct adapter *adapter)
+{
+	struct sge *s = &adapter->sge;
+	int rxq;
+
+	for_each_ethrxq(s, rxq)
+		napi_disable(&s->ethrxq[rxq].rspq.napi);
+	napi_disable(&s->fw_evtq.napi);
+}
+
+/*
+ * Response queue handler for the firmware event queue.
+ */
+static int fwevtq_handler(struct sge_rspq *rspq, const __be64 *rsp,
+			  const struct pkt_gl *gl)
+{
+	/*
+	 * Extract response opcode and get pointer to CPL message body.
+	 */
+	struct adapter *adapter = rspq->adapter;
+	u8 opcode = ((const struct rss_header *)rsp)->opcode;
+	void *cpl = (void *)(rsp + 1);
+
+	switch (opcode) {
+	case CPL_FW6_MSG: {
+		/*
+		 * We've received an asynchronous message from the firmware.
+		 */
+		const struct cpl_fw6_msg *fw_msg = cpl;
+		if (fw_msg->type == FW6_TYPE_CMD_RPL)
+			t4vf_handle_fw_rpl(adapter, fw_msg->data);
+		break;
+	}
+
+	case CPL_SGE_EGR_UPDATE: {
+		/*
+		 * We've received an Egress Queue status update message.
+		 * We get these, as the SGE is currently configured, when
+		 * the firmware passes certain points in processing our
+		 * TX Ethernet Queue.  We use these updates to determine
+		 * when we may need to restart a TX Ethernet Queue which
+		 * was stopped for lack of free slots ...
+		 */
+		const struct cpl_sge_egr_update *p = (void *)cpl;
+		unsigned int qid = EGR_QID(be32_to_cpu(p->opcode_qid));
+		struct sge *s = &adapter->sge;
+		struct sge_txq *tq;
+		struct sge_eth_txq *txq;
+		unsigned int eq_idx;
+		int hw_cidx, reclaimable, in_use;
+
+		/*
+		 * Perform sanity checking on the Queue ID to make sure it
+		 * really refers to one of our TX Ethernet Egress Queues which
+		 * is active and matches the queue's ID.  None of these error
+		 * conditions should ever happen so we may want to either make
+		 * them fatal and/or conditionalized under DEBUG.
+		 */
+		eq_idx = EQ_IDX(s, qid);
+		if (unlikely(eq_idx >= MAX_EGRQ)) {
+			dev_err(adapter->pdev_dev,
+				"Egress Update QID %d out of range\n", qid);
+			break;
+		}
+		tq = s->egr_map[eq_idx];
+		if (unlikely(tq == NULL)) {
+			dev_err(adapter->pdev_dev,
+				"Egress Update QID %d TXQ=NULL\n", qid);
+			break;
+		}
+		txq = container_of(tq, struct sge_eth_txq, q);
+		if (unlikely(tq->abs_id != qid)) {
+			dev_err(adapter->pdev_dev,
+				"Egress Update QID %d refers to TXQ %d\n",
+				qid, tq->abs_id);
+			break;
+		}
+
+		/*
+		 * Skip TX Queues which aren't stopped.
+		 */
+		if (likely(!netif_tx_queue_stopped(txq->txq)))
+			break;
+
+		/*
+		 * Skip stopped TX Queues which have more than half of their
+		 * DMA rings occupied with unacknowledged writes.
+		 */
+		hw_cidx = be16_to_cpu(txq->q.stat->cidx);
+		reclaimable = hw_cidx - txq->q.cidx;
+		if (reclaimable < 0)
+			reclaimable += txq->q.size;
+		in_use = txq->q.in_use - reclaimable;
+		if (in_use >= txq->q.size/2)
+			break;
+
+		/*
+		 * Restart a stopped TX Queue which has less than half of its
+		 * TX ring in use ...
+		 */
+		txq->q.restarts++;
+		netif_tx_wake_queue(txq->txq);
+		break;
+	}
+
+	default:
+		dev_err(adapter->pdev_dev,
+			"unexpected CPL %#x on FW event queue\n", opcode);
+	}
+
+	return 0;
+}
+
+/*
+ * Allocate SGE TX/RX response queues.  Determine how many sets of SGE queues
+ * to use and initializes them.  We support multiple "Queue Sets" per port if
+ * we have MSI-X, otherwise just one queue set per port.
+ */
+static int setup_sge_queues(struct adapter *adapter)
+{
+	struct sge *s = &adapter->sge;
+	int err, pidx, msix;
+
+	/*
+	 * Clear "Queue Set" Free List Starving and TX Queue Mapping Error
+	 * state.
+	 */
+	bitmap_zero(s->starving_fl, MAX_EGRQ);
+
+	/*
+	 * If we're using MSI interrupt mode we need to set up a "forwarded
+	 * interrupt" queue which we'll set up with our MSI vector.  The rest
+	 * of the ingress queues will be set up to forward their interrupts to
+	 * this queue ...  This must be first since t4vf_sge_alloc_rxq() uses
+	 * the intrq's queue ID as the interrupt forwarding queue for the
+	 * subsequent calls ...
+	 */
+	if (adapter->flags & USING_MSI) {
+		err = t4vf_sge_alloc_rxq(adapter, &s->intrq, false,
+					 adapter->port[0], 0, NULL, NULL);
+		if (err)
+			goto err_free_queues;
+	}
+
+	/*
+	 * Allocate our ingress queue for asynchronous firmware messages.
+	 */
+	err = t4vf_sge_alloc_rxq(adapter, &s->fw_evtq, true, adapter->port[0],
+				 MSIX_FW, NULL, fwevtq_handler);
+	if (err)
+		goto err_free_queues;
+
+	/*
+	 * Allocate each "port"'s initial Queue Sets.  These can be changed
+	 * later on ... up to the point where any interface on the adapter is
+	 * brought up at which point lots of things get nailed down
+	 * permanently ...
+	 */
+	msix = MSIX_NIQFLINT;
+	for_each_port(adapter, pidx) {
+		struct net_device *dev = adapter->port[pidx];
+		struct port_info *pi = netdev_priv(dev);
+		struct sge_eth_rxq *rxq = &s->ethrxq[pi->first_qset];
+		struct sge_eth_txq *txq = &s->ethtxq[pi->first_qset];
+		int nqsets = (adapter->flags & USING_MSIX) ? pi->nqsets : 1;
+		int qs;
+
+		for (qs = 0; qs < nqsets; qs++, rxq++, txq++) {
+			err = t4vf_sge_alloc_rxq(adapter, &rxq->rspq, false,
+						 dev, msix++,
+						 &rxq->fl, t4vf_ethrx_handler);
+			if (err)
+				goto err_free_queues;
+
+			err = t4vf_sge_alloc_eth_txq(adapter, txq, dev,
+					     netdev_get_tx_queue(dev, qs),
+					     s->fw_evtq.cntxt_id);
+			if (err)
+				goto err_free_queues;
+
+			rxq->rspq.idx = qs;
+			memset(&rxq->stats, 0, sizeof(rxq->stats));
+		}
+	}
+
+	/*
+	 * Create the reverse mappings for the queues.
+	 */
+	s->egr_base = s->ethtxq[0].q.abs_id - s->ethtxq[0].q.cntxt_id;
+	s->ingr_base = s->ethrxq[0].rspq.abs_id - s->ethrxq[0].rspq.cntxt_id;
+	IQ_MAP(s, s->fw_evtq.abs_id) = &s->fw_evtq;
+	for_each_port(adapter, pidx) {
+		struct net_device *dev = adapter->port[pidx];
+		struct port_info *pi = netdev_priv(dev);
+		struct sge_eth_rxq *rxq = &s->ethrxq[pi->first_qset];
+		struct sge_eth_txq *txq = &s->ethtxq[pi->first_qset];
+		int nqsets = (adapter->flags & USING_MSIX) ? pi->nqsets : 1;
+		int qs;
+
+		for (qs = 0; qs < nqsets; qs++, rxq++, txq++) {
+			IQ_MAP(s, rxq->rspq.abs_id) = &rxq->rspq;
+			EQ_MAP(s, txq->q.abs_id) = &txq->q;
+
+			/*
+			 * The FW_IQ_CMD doesn't return the Absolute Queue IDs
+			 * for Free Lists but since all of the Egress Queues
+			 * (including Free Lists) have Relative Queue IDs
+			 * which are computed as Absolute - Base Queue ID, we
+			 * can synthesize the Absolute Queue IDs for the Free
+			 * Lists.  This is useful for debugging purposes when
+			 * we want to dump Queue Contexts via the PF Driver.
+			 */
+			rxq->fl.abs_id = rxq->fl.cntxt_id + s->egr_base;
+			EQ_MAP(s, rxq->fl.abs_id) = &rxq->fl;
+		}
+	}
+	return 0;
+
+err_free_queues:
+	t4vf_free_sge_resources(adapter);
+	return err;
+}
+
+/*
+ * Set up Receive Side Scaling (RSS) to distribute packets to multiple receive
+ * queues.  We configure the RSS CPU lookup table to distribute to the number
+ * of HW receive queues, and the response queue lookup table to narrow that
+ * down to the response queues actually configured for each "port" (Virtual
+ * Interface).  We always configure the RSS mapping for all ports since the
+ * mapping table has plenty of entries.
+ */
+static int setup_rss(struct adapter *adapter)
+{
+	int pidx;
+
+	for_each_port(adapter, pidx) {
+		struct port_info *pi = adap2pinfo(adapter, pidx);
+		struct sge_eth_rxq *rxq = &adapter->sge.ethrxq[pi->first_qset];
+		u16 rss[MAX_PORT_QSETS];
+		int qs, err;
+
+		for (qs = 0; qs < pi->nqsets; qs++)
+			rss[qs] = rxq[qs].rspq.abs_id;
+
+		err = t4vf_config_rss_range(adapter, pi->viid,
+					    0, pi->rss_size, rss, pi->nqsets);
+		if (err)
+			return err;
+
+		/*
+		 * Perform Global RSS Mode-specific initialization.
+		 */
+		switch (adapter->params.rss.mode) {
+		case FW_RSS_GLB_CONFIG_CMD_MODE_BASICVIRTUAL:
+			/*
+			 * If Tunnel All Lookup isn't specified in the global
+			 * RSS Configuration, then we need to specify a
+			 * default Ingress Queue for any ingress packets which
+			 * aren't hashed.  We'll use our first ingress queue
+			 * ...
+			 */
+			if (!adapter->params.rss.u.basicvirtual.tnlalllookup) {
+				union rss_vi_config config;
+				err = t4vf_read_rss_vi_config(adapter,
+							      pi->viid,
+							      &config);
+				if (err)
+					return err;
+				config.basicvirtual.defaultq =
+					rxq[0].rspq.abs_id;
+				err = t4vf_write_rss_vi_config(adapter,
+							       pi->viid,
+							       &config);
+				if (err)
+					return err;
+			}
+			break;
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * Bring the adapter up.  Called whenever we go from no "ports" open to having
+ * one open.  This function performs the actions necessary to make an adapter
+ * operational, such as completing the initialization of HW modules, and
+ * enabling interrupts.  Must be called with the rtnl lock held.  (Note that
+ * this is called "cxgb_up" in the PF Driver.)
+ */
+static int adapter_up(struct adapter *adapter)
+{
+	int err;
+
+	/*
+	 * If this is the first time we've been called, perform basic
+	 * adapter setup.  Once we've done this, many of our adapter
+	 * parameters can no longer be changed ...
+	 */
+	if ((adapter->flags & FULL_INIT_DONE) == 0) {
+		err = setup_sge_queues(adapter);
+		if (err)
+			return err;
+		err = setup_rss(adapter);
+		if (err) {
+			t4vf_free_sge_resources(adapter);
+			return err;
+		}
+
+		if (adapter->flags & USING_MSIX)
+			name_msix_vecs(adapter);
+		adapter->flags |= FULL_INIT_DONE;
+	}
+
+	/*
+	 * Acquire our interrupt resources.  We only support MSI-X and MSI.
+	 */
+	BUG_ON((adapter->flags & (USING_MSIX|USING_MSI)) == 0);
+	if (adapter->flags & USING_MSIX)
+		err = request_msix_queue_irqs(adapter);
+	else
+		err = request_irq(adapter->pdev->irq,
+				  t4vf_intr_handler(adapter), 0,
+				  adapter->name, adapter);
+	if (err) {
+		dev_err(adapter->pdev_dev, "request_irq failed, err %d\n",
+			err);
+		return err;
+	}
+
+	/*
+	 * Enable NAPI ingress processing and return success.
+	 */
+	enable_rx(adapter);
+	t4vf_sge_start(adapter);
+	return 0;
+}
+
+/*
+ * Bring the adapter down.  Called whenever the last "port" (Virtual
+ * Interface) closed.  (Note that this routine is called "cxgb_down" in the PF
+ * Driver.)
+ */
+static void adapter_down(struct adapter *adapter)
+{
+	/*
+	 * Free interrupt resources.
+	 */
+	if (adapter->flags & USING_MSIX)
+		free_msix_queue_irqs(adapter);
+	else
+		free_irq(adapter->pdev->irq, adapter);
+
+	/*
+	 * Wait for NAPI handlers to finish.
+	 */
+	quiesce_rx(adapter);
+}
+
+/*
+ * Start up a net device.
+ */
+static int cxgb4vf_open(struct net_device *dev)
+{
+	int err;
+	struct port_info *pi = netdev_priv(dev);
+	struct adapter *adapter = pi->adapter;
+
+	/*
+	 * If this is the first interface that we're opening on the "adapter",
+	 * bring the "adapter" up now.
+	 */
+	if (adapter->open_device_map == 0) {
+		err = adapter_up(adapter);
+		if (err)
+			return err;
+	}
+
+	/*
+	 * Note that this interface is up and start everything up ...
+	 */
+	dev->real_num_tx_queues = pi->nqsets;
+	set_bit(pi->port_id, &adapter->open_device_map);
+	link_start(dev);
+	netif_tx_start_all_queues(dev);
+	return 0;
+}
+
+/*
+ * Shut down a net device.  This routine is called "cxgb_close" in the PF
+ * Driver ...
+ */
+static int cxgb4vf_stop(struct net_device *dev)
+{
+	int ret;
+	struct port_info *pi = netdev_priv(dev);
+	struct adapter *adapter = pi->adapter;
+
+	netif_tx_stop_all_queues(dev);
+	netif_carrier_off(dev);
+	ret = t4vf_enable_vi(adapter, pi->viid, false, false);
+	pi->link_cfg.link_ok = 0;
+
+	clear_bit(pi->port_id, &adapter->open_device_map);
+	if (adapter->open_device_map == 0)
+		adapter_down(adapter);
+	return 0;
+}
+
+/*
+ * Translate our basic statistics into the standard "ifconfig" statistics.
+ */
+static struct net_device_stats *cxgb4vf_get_stats(struct net_device *dev)
+{
+	struct t4vf_port_stats stats;
+	struct port_info *pi = netdev2pinfo(dev);
+	struct adapter *adapter = pi->adapter;
+	struct net_device_stats *ns = &dev->stats;
+	int err;
+
+	spin_lock(&adapter->stats_lock);
+	err = t4vf_get_port_stats(adapter, pi->pidx, &stats);
+	spin_unlock(&adapter->stats_lock);
+
+	memset(ns, 0, sizeof(*ns));
+	if (err)
+		return ns;
+
+	ns->tx_bytes = (stats.tx_bcast_bytes + stats.tx_mcast_bytes +
+			stats.tx_ucast_bytes + stats.tx_offload_bytes);
+	ns->tx_packets = (stats.tx_bcast_frames + stats.tx_mcast_frames +
+			  stats.tx_ucast_frames + stats.tx_offload_frames);
+	ns->rx_bytes = (stats.rx_bcast_bytes + stats.rx_mcast_bytes +
+			stats.rx_ucast_bytes);
+	ns->rx_packets = (stats.rx_bcast_frames + stats.rx_mcast_frames +
+			  stats.rx_ucast_frames);
+	ns->multicast = stats.rx_mcast_frames;
+	ns->tx_errors = stats.tx_drop_frames;
+	ns->rx_errors = stats.rx_err_frames;
+
+	return ns;
+}
+
+/*
+ * Collect up to maxaddrs worth of a netdevice's unicast addresses into an
+ * array of addrss pointers and return the number collected.
+ */
+static inline int collect_netdev_uc_list_addrs(const struct net_device *dev,
+					       const u8 **addr,
+					       unsigned int maxaddrs)
+{
+	unsigned int naddr = 0;
+	const struct netdev_hw_addr *ha;
+
+	for_each_dev_addr(dev, ha) {
+		addr[naddr++] = ha->addr;
+		if (naddr >= maxaddrs)
+			break;
+	}
+	return naddr;
+}
+
+/*
+ * Collect up to maxaddrs worth of a netdevice's multicast addresses into an
+ * array of addrss pointers and return the number collected.
+ */
+static inline int collect_netdev_mc_list_addrs(const struct net_device *dev,
+					       const u8 **addr,
+					       unsigned int maxaddrs)
+{
+	unsigned int naddr = 0;
+	const struct netdev_hw_addr *ha;
+
+	netdev_for_each_mc_addr(ha, dev) {
+		addr[naddr++] = ha->addr;
+		if (naddr >= maxaddrs)
+			break;
+	}
+	return naddr;
+}
+
+/*
+ * Configure the exact and hash address filters to handle a port's multicast
+ * and secondary unicast MAC addresses.
+ */
+static int set_addr_filters(const struct net_device *dev, bool sleep)
+{
+	u64 mhash = 0;
+	u64 uhash = 0;
+	bool free = true;
+	u16 filt_idx[7];
+	const u8 *addr[7];
+	int ret, naddr = 0;
+	const struct port_info *pi = netdev_priv(dev);
+
+	/* first do the secondary unicast addresses */
+	naddr = collect_netdev_uc_list_addrs(dev, addr, ARRAY_SIZE(addr));
+	if (naddr > 0) {
+		ret = t4vf_alloc_mac_filt(pi->adapter, pi->viid, free,
+					  naddr, addr, filt_idx, &uhash, sleep);
+		if (ret < 0)
+			return ret;
+
+		free = false;
+	}
+
+	/* next set up the multicast addresses */
+	naddr = collect_netdev_mc_list_addrs(dev, addr, ARRAY_SIZE(addr));
+	if (naddr > 0) {
+		ret = t4vf_alloc_mac_filt(pi->adapter, pi->viid, free,
+					  naddr, addr, filt_idx, &mhash, sleep);
+		if (ret < 0)
+			return ret;
+	}
+
+	return t4vf_set_addr_hash(pi->adapter, pi->viid, uhash != 0,
+				  uhash | mhash, sleep);
+}
+
+/*
+ * Set RX properties of a port, such as promiscruity, address filters, and MTU.
+ * If @mtu is -1 it is left unchanged.
+ */
+static int set_rxmode(struct net_device *dev, int mtu, bool sleep_ok)
+{
+	int ret;
+	struct port_info *pi = netdev_priv(dev);
+
+	ret = set_addr_filters(dev, sleep_ok);
+	if (ret == 0)
+		ret = t4vf_set_rxmode(pi->adapter, pi->viid, -1,
+				      (dev->flags & IFF_PROMISC) != 0,
+				      (dev->flags & IFF_ALLMULTI) != 0,
+				      1, -1, sleep_ok);
+	return ret;
+}
+
+/*
+ * Set the current receive modes on the device.
+ */
+static void cxgb4vf_set_rxmode(struct net_device *dev)
+{
+	/* unfortunately we can't return errors to the stack */
+	set_rxmode(dev, -1, false);
+}
+
+/*
+ * Find the entry in the interrupt holdoff timer value array which comes
+ * closest to the specified interrupt holdoff value.
+ */
+static int closest_timer(const struct sge *s, int us)
+{
+	int i, timer_idx = 0, min_delta = INT_MAX;
+
+	for (i = 0; i < ARRAY_SIZE(s->timer_val); i++) {
+		int delta = us - s->timer_val[i];
+		if (delta < 0)
+			delta = -delta;
+		if (delta < min_delta) {
+			min_delta = delta;
+			timer_idx = i;
+		}
+	}
+	return timer_idx;
+}
+
+static int closest_thres(const struct sge *s, int thres)
+{
+	int i, delta, pktcnt_idx = 0, min_delta = INT_MAX;
+
+	for (i = 0; i < ARRAY_SIZE(s->counter_val); i++) {
+		delta = thres - s->counter_val[i];
+		if (delta < 0)
+			delta = -delta;
+		if (delta < min_delta) {
+			min_delta = delta;
+			pktcnt_idx = i;
+		}
+	}
+	return pktcnt_idx;
+}
+
+/*
+ * Return a queue's interrupt hold-off time in us.  0 means no timer.
+ */
+static unsigned int qtimer_val(const struct adapter *adapter,
+			       const struct sge_rspq *rspq)
+{
+	unsigned int timer_idx = QINTR_TIMER_IDX_GET(rspq->intr_params);
+
+	return timer_idx < SGE_NTIMERS
+		? adapter->sge.timer_val[timer_idx]
+		: 0;
+}
+
+/**
+ *	set_rxq_intr_params - set a queue's interrupt holdoff parameters
+ *	@adapter: the adapter
+ *	@rspq: the RX response queue
+ *	@us: the hold-off time in us, or 0 to disable timer
+ *	@cnt: the hold-off packet count, or 0 to disable counter
+ *
+ *	Sets an RX response queue's interrupt hold-off time and packet count.
+ *	At least one of the two needs to be enabled for the queue to generate
+ *	interrupts.
+ */
+static int set_rxq_intr_params(struct adapter *adapter, struct sge_rspq *rspq,
+			       unsigned int us, unsigned int cnt)
+{
+	unsigned int timer_idx;
+
+	/*
+	 * If both the interrupt holdoff timer and count are specified as
+	 * zero, default to a holdoff count of 1 ...
+	 */
+	if ((us | cnt) == 0)
+		cnt = 1;
+
+	/*
+	 * If an interrupt holdoff count has been specified, then find the
+	 * closest configured holdoff count and use that.  If the response
+	 * queue has already been created, then update its queue context
+	 * parameters ...
+	 */
+	if (cnt) {
+		int err;
+		u32 v, pktcnt_idx;
+
+		pktcnt_idx = closest_thres(&adapter->sge, cnt);
+		if (rspq->desc && rspq->pktcnt_idx != pktcnt_idx) {
+			v = FW_PARAMS_MNEM(FW_PARAMS_MNEM_DMAQ) |
+			    FW_PARAMS_PARAM_X(
+					FW_PARAMS_PARAM_DMAQ_IQ_INTCNTTHRESH) |
+			    FW_PARAMS_PARAM_YZ(rspq->cntxt_id);
+			err = t4vf_set_params(adapter, 1, &v, &pktcnt_idx);
+			if (err)
+				return err;
+		}
+		rspq->pktcnt_idx = pktcnt_idx;
+	}
+
+	/*
+	 * Compute the closest holdoff timer index from the supplied holdoff
+	 * timer value.
+	 */
+	timer_idx = (us == 0
+		     ? SGE_TIMER_RSTRT_CNTR
+		     : closest_timer(&adapter->sge, us));
+
+	/*
+	 * Update the response queue's interrupt coalescing parameters and
+	 * return success.
+	 */
+	rspq->intr_params = (QINTR_TIMER_IDX(timer_idx) |
+			     (cnt > 0 ? QINTR_CNT_EN : 0));
+	return 0;
+}
+
+/*
+ * Return a version number to identify the type of adapter.  The scheme is:
+ * - bits 0..9: chip version
+ * - bits 10..15: chip revision
+ */
+static inline unsigned int mk_adap_vers(const struct adapter *adapter)
+{
+	/*
+	 * Chip version 4, revision 0x3f (cxgb4vf).
+	 */
+	return 4 | (0x3f << 10);
+}
+
+/*
+ * Execute the specified ioctl command.
+ */
+static int cxgb4vf_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	int ret = 0;
+
+	switch (cmd) {
+	    /*
+	     * The VF Driver doesn't have access to any of the other
+	     * common Ethernet device ioctl()'s (like reading/writing
+	     * PHY registers, etc.
+	     */
+
+	default:
+		ret = -EOPNOTSUPP;
+		break;
+	}
+	return ret;
+}
+
+/*
+ * Change the device's MTU.
+ */
+static int cxgb4vf_change_mtu(struct net_device *dev, int new_mtu)
+{
+	int ret;
+	struct port_info *pi = netdev_priv(dev);
+
+	/* accommodate SACK */
+	if (new_mtu < 81)
+		return -EINVAL;
+
+	ret = t4vf_set_rxmode(pi->adapter, pi->viid, new_mtu,
+			      -1, -1, -1, -1, true);
+	if (!ret)
+		dev->mtu = new_mtu;
+	return ret;
+}
+
+/*
+ * Change the devices MAC address.
+ */
+static int cxgb4vf_set_mac_addr(struct net_device *dev, void *_addr)
+{
+	int ret;
+	struct sockaddr *addr = _addr;
+	struct port_info *pi = netdev_priv(dev);
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EINVAL;
+
+	ret = t4vf_change_mac(pi->adapter, pi->viid, pi->xact_addr_filt,
+			      addr->sa_data, true);
+	if (ret < 0)
+		return ret;
+
+	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
+	pi->xact_addr_filt = ret;
+	return 0;
+}
+
+/*
+ * Return a TX Queue on which to send the specified skb.
+ */
+static u16 cxgb4vf_select_queue(struct net_device *dev, struct sk_buff *skb)
+{
+	/*
+	 * XXX For now just use the default hash but we probably want to
+	 * XXX look at other possibilities ...
+	 */
+	return skb_tx_hash(dev, skb);
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/*
+ * Poll all of our receive queues.  This is called outside of normal interrupt
+ * context.
+ */
+static void cxgb4vf_poll_controller(struct net_device *dev)
+{
+	struct port_info *pi = netdev_priv(dev);
+	struct adapter *adapter = pi->adapter;
+
+	if (adapter->flags & USING_MSIX) {
+		struct sge_eth_rxq *rxq;
+		int nqsets;
+
+		rxq = &adapter->sge.ethrxq[pi->first_qset];
+		for (nqsets = pi->nqsets; nqsets; nqsets--) {
+			t4vf_sge_intr_msix(0, &rxq->rspq);
+			rxq++;
+		}
+	} else
+		t4vf_intr_handler(adapter)(0, adapter);
+}
+#endif
+
+/*
+ * Ethtool operations.
+ * ===================
+ *
+ * Note that we don't support any ethtool operations which change the physical
+ * state of the port to which we're linked.
+ */
+
+/*
+ * Return current port link settings.
+ */
+static int cxgb4vf_get_settings(struct net_device *dev,
+				struct ethtool_cmd *cmd)
+{
+	const struct port_info *pi = netdev_priv(dev);
+
+	cmd->supported = pi->link_cfg.supported;
+	cmd->advertising = pi->link_cfg.advertising;
+	cmd->speed = netif_carrier_ok(dev) ? pi->link_cfg.speed : -1;
+	cmd->duplex = DUPLEX_FULL;
+
+	cmd->port = (cmd->supported & SUPPORTED_TP) ? PORT_TP : PORT_FIBRE;
+	cmd->phy_address = pi->port_id;
+	cmd->transceiver = XCVR_EXTERNAL;
+	cmd->autoneg = pi->link_cfg.autoneg;
+	cmd->maxtxpkt = 0;
+	cmd->maxrxpkt = 0;
+	return 0;
+}
+
+/*
+ * Return our driver information.
+ */
+static void cxgb4vf_get_drvinfo(struct net_device *dev,
+				struct ethtool_drvinfo *drvinfo)
+{
+	struct adapter *adapter = netdev2adap(dev);
+
+	strcpy(drvinfo->driver, KBUILD_MODNAME);
+	strcpy(drvinfo->version, DRV_VERSION);
+	strcpy(drvinfo->bus_info, pci_name(to_pci_dev(dev->dev.parent)));
+	snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
+		 "%u.%u.%u.%u, TP %u.%u.%u.%u",
+		 FW_HDR_FW_VER_MAJOR_GET(adapter->params.dev.fwrev),
+		 FW_HDR_FW_VER_MINOR_GET(adapter->params.dev.fwrev),
+		 FW_HDR_FW_VER_MICRO_GET(adapter->params.dev.fwrev),
+		 FW_HDR_FW_VER_BUILD_GET(adapter->params.dev.fwrev),
+		 FW_HDR_FW_VER_MAJOR_GET(adapter->params.dev.tprev),
+		 FW_HDR_FW_VER_MINOR_GET(adapter->params.dev.tprev),
+		 FW_HDR_FW_VER_MICRO_GET(adapter->params.dev.tprev),
+		 FW_HDR_FW_VER_BUILD_GET(adapter->params.dev.tprev));
+}
+
+/*
+ * Return current adapter message level.
+ */
+static u32 cxgb4vf_get_msglevel(struct net_device *dev)
+{
+	return netdev2adap(dev)->msg_enable;
+}
+
+/*
+ * Set current adapter message level.
+ */
+static void cxgb4vf_set_msglevel(struct net_device *dev, u32 msglevel)
+{
+	netdev2adap(dev)->msg_enable = msglevel;
+}
+
+/*
+ * Return the device's current Queue Set ring size parameters along with the
+ * allowed maximum values.  Since ethtool doesn't understand the concept of
+ * multi-queue devices, we just return the current values associated with the
+ * first Queue Set.
+ */
+static void cxgb4vf_get_ringparam(struct net_device *dev,
+				  struct ethtool_ringparam *rp)
+{
+	const struct port_info *pi = netdev_priv(dev);
+	const struct sge *s = &pi->adapter->sge;
+
+	rp->rx_max_pending = MAX_RX_BUFFERS;
+	rp->rx_mini_max_pending = MAX_RSPQ_ENTRIES;
+	rp->rx_jumbo_max_pending = 0;
+	rp->tx_max_pending = MAX_TXQ_ENTRIES;
+
+	rp->rx_pending = s->ethrxq[pi->first_qset].fl.size - MIN_FL_RESID;
+	rp->rx_mini_pending = s->ethrxq[pi->first_qset].rspq.size;
+	rp->rx_jumbo_pending = 0;
+	rp->tx_pending = s->ethtxq[pi->first_qset].q.size;
+}
+
+/*
+ * Set the Queue Set ring size parameters for the device.  Again, since
+ * ethtool doesn't allow for the concept of multiple queues per device, we'll
+ * apply these new values across all of the Queue Sets associated with the
+ * device -- after vetting them of course!
+ */
+static int cxgb4vf_set_ringparam(struct net_device *dev,
+				 struct ethtool_ringparam *rp)
+{
+	const struct port_info *pi = netdev_priv(dev);
+	struct adapter *adapter = pi->adapter;
+	struct sge *s = &adapter->sge;
+	int qs;
+
+	if (rp->rx_pending > MAX_RX_BUFFERS ||
+	    rp->rx_jumbo_pending ||
+	    rp->tx_pending > MAX_TXQ_ENTRIES ||
+	    rp->rx_mini_pending > MAX_RSPQ_ENTRIES ||
+	    rp->rx_mini_pending < MIN_RSPQ_ENTRIES ||
+	    rp->rx_pending < MIN_FL_ENTRIES ||
+	    rp->tx_pending < MIN_TXQ_ENTRIES)
+		return -EINVAL;
+
+	if (adapter->flags & FULL_INIT_DONE)
+		return -EBUSY;
+
+	for (qs = pi->first_qset; qs < pi->first_qset + pi->nqsets; qs++) {
+		s->ethrxq[qs].fl.size = rp->rx_pending + MIN_FL_RESID;
+		s->ethrxq[qs].rspq.size = rp->rx_mini_pending;
+		s->ethtxq[qs].q.size = rp->tx_pending;
+	}
+	return 0;
+}
+
+/*
+ * Return the interrupt holdoff timer and count for the first Queue Set on the
+ * device.  Our extension ioctl() (the cxgbtool interface) allows the
+ * interrupt holdoff timer to be read on all of the device's Queue Sets.
+ */
+static int cxgb4vf_get_coalesce(struct net_device *dev,
+				struct ethtool_coalesce *coalesce)
+{
+	const struct port_info *pi = netdev_priv(dev);
+	const struct adapter *adapter = pi->adapter;
+	const struct sge_rspq *rspq = &adapter->sge.ethrxq[pi->first_qset].rspq;
+
+	coalesce->rx_coalesce_usecs = qtimer_val(adapter, rspq);
+	coalesce->rx_max_coalesced_frames =
+		((rspq->intr_params & QINTR_CNT_EN)
+		 ? adapter->sge.counter_val[rspq->pktcnt_idx]
+		 : 0);
+	return 0;
+}
+
+/*
+ * Set the RX interrupt holdoff timer and count for the first Queue Set on the
+ * interface.  Our extension ioctl() (the cxgbtool interface) allows us to set
+ * the interrupt holdoff timer on any of the device's Queue Sets.
+ */
+static int cxgb4vf_set_coalesce(struct net_device *dev,
+				struct ethtool_coalesce *coalesce)
+{
+	const struct port_info *pi = netdev_priv(dev);
+	struct adapter *adapter = pi->adapter;
+
+	return set_rxq_intr_params(adapter,
+				   &adapter->sge.ethrxq[pi->first_qset].rspq,
+				   coalesce->rx_coalesce_usecs,
+				   coalesce->rx_max_coalesced_frames);
+}
+
+/*
+ * Report current port link pause parameter settings.
+ */
+static void cxgb4vf_get_pauseparam(struct net_device *dev,
+				   struct ethtool_pauseparam *pauseparam)
+{
+	struct port_info *pi = netdev_priv(dev);
+
+	pauseparam->autoneg = (pi->link_cfg.requested_fc & PAUSE_AUTONEG) != 0;
+	pauseparam->rx_pause = (pi->link_cfg.fc & PAUSE_RX) != 0;
+	pauseparam->tx_pause = (pi->link_cfg.fc & PAUSE_TX) != 0;
+}
+
+/*
+ * Return whether RX Checksum Offloading is currently enabled for the device.
+ */
+static u32 cxgb4vf_get_rx_csum(struct net_device *dev)
+{
+	struct port_info *pi = netdev_priv(dev);
+
+	return (pi->rx_offload & RX_CSO) != 0;
+}
+
+/*
+ * Turn RX Checksum Offloading on or off for the device.
+ */
+static int cxgb4vf_set_rx_csum(struct net_device *dev, u32 csum)
+{
+	struct port_info *pi = netdev_priv(dev);
+
+	if (csum)
+		pi->rx_offload |= RX_CSO;
+	else
+		pi->rx_offload &= ~RX_CSO;
+	return 0;
+}
+
+/*
+ * Identify the port by blinking the port's LED.
+ */
+static int cxgb4vf_phys_id(struct net_device *dev, u32 id)
+{
+	struct port_info *pi = netdev_priv(dev);
+
+	return t4vf_identify_port(pi->adapter, pi->viid, 5);
+}
+
+/*
+ * Port stats maintained per queue of the port.
+ */
+struct queue_port_stats {
+	u64 tso;
+	u64 tx_csum;
+	u64 rx_csum;
+	u64 vlan_ex;
+	u64 vlan_ins;
+};
+
+/*
+ * Strings for the ETH_SS_STATS statistics set ("ethtool -S").  Note that
+ * these need to match the order of statistics returned by
+ * t4vf_get_port_stats().
+ */
+static const char stats_strings[][ETH_GSTRING_LEN] = {
+	/*
+	 * These must match the layout of the t4vf_port_stats structure.
+	 */
+	"TxBroadcastBytes  ",
+	"TxBroadcastFrames ",
+	"TxMulticastBytes  ",
+	"TxMulticastFrames ",
+	"TxUnicastBytes    ",
+	"TxUnicastFrames   ",
+	"TxDroppedFrames   ",
+	"TxOffloadBytes    ",
+	"TxOffloadFrames   ",
+	"RxBroadcastBytes  ",
+	"RxBroadcastFrames ",
+	"RxMulticastBytes  ",
+	"RxMulticastFrames ",
+	"RxUnicastBytes    ",
+	"RxUnicastFrames   ",
+	"RxErrorFrames     ",
+
+	/*
+	 * These are accumulated per-queue statistics and must match the
+	 * order of the fields in the queue_port_stats structure.
+	 */
+	"TSO               ",
+	"TxCsumOffload     ",
+	"RxCsumGood        ",
+	"VLANextractions   ",
+	"VLANinsertions    ",
+};
+
+/*
+ * Return the number of statistics in the specified statistics set.
+ */
+static int cxgb4vf_get_sset_count(struct net_device *dev, int sset)
+{
+	switch (sset) {
+	case ETH_SS_STATS:
+		return ARRAY_SIZE(stats_strings);
+	default:
+		return -EOPNOTSUPP;
+	}
+	/*NOTREACHED*/
+}
+
+/*
+ * Return the strings for the specified statistics set.
+ */
+static void cxgb4vf_get_strings(struct net_device *dev,
+				u32 sset,
+				u8 *data)
+{
+	switch (sset) {
+	case ETH_SS_STATS:
+		memcpy(data, stats_strings, sizeof(stats_strings));
+		break;
+	}
+}
+
+/*
+ * Small utility routine to accumulate queue statistics across the queues of
+ * a "port".
+ */
+static void collect_sge_port_stats(const struct adapter *adapter,
+				   const struct port_info *pi,
+				   struct queue_port_stats *stats)
+{
+	const struct sge_eth_txq *txq = &adapter->sge.ethtxq[pi->first_qset];
+	const struct sge_eth_rxq *rxq = &adapter->sge.ethrxq[pi->first_qset];
+	int qs;
+
+	memset(stats, 0, sizeof(*stats));
+	for (qs = 0; qs < pi->nqsets; qs++, rxq++, txq++) {
+		stats->tso += txq->tso;
+		stats->tx_csum += txq->tx_cso;
+		stats->rx_csum += rxq->stats.rx_cso;
+		stats->vlan_ex += rxq->stats.vlan_ex;
+		stats->vlan_ins += txq->vlan_ins;
+	}
+}
+
+/*
+ * Return the ETH_SS_STATS statistics set.
+ */
+static void cxgb4vf_get_ethtool_stats(struct net_device *dev,
+				      struct ethtool_stats *stats,
+				      u64 *data)
+{
+	struct port_info *pi = netdev2pinfo(dev);
+	struct adapter *adapter = pi->adapter;
+	int err = t4vf_get_port_stats(adapter, pi->pidx,
+				      (struct t4vf_port_stats *)data);
+	if (err)
+		memset(data, 0, sizeof(struct t4vf_port_stats));
+
+	data += sizeof(struct t4vf_port_stats) / sizeof(u64);
+	collect_sge_port_stats(adapter, pi, (struct queue_port_stats *)data);
+}
+
+/*
+ * Return the size of our register map.
+ */
+static int cxgb4vf_get_regs_len(struct net_device *dev)
+{
+	return T4VF_REGMAP_SIZE;
+}
+
+/*
+ * Dump a block of registers, start to end inclusive, into a buffer.
+ */
+static void reg_block_dump(struct adapter *adapter, void *regbuf,
+			   unsigned int start, unsigned int end)
+{
+	u32 *bp = regbuf + start - T4VF_REGMAP_START;
+
+	for ( ; start <= end; start += sizeof(u32)) {
+		/*
+		 * Avoid reading the Mailbox Control register since that
+		 * can trigger a Mailbox Ownership Arbitration cycle and
+		 * interfere with communication with the firmware.
+		 */
+		if (start == T4VF_CIM_BASE_ADDR + CIM_VF_EXT_MAILBOX_CTRL)
+			*bp++ = 0xffff;
+		else
+			*bp++ = t4_read_reg(adapter, start);
+	}
+}
+
+/*
+ * Copy our entire register map into the provided buffer.
+ */
+static void cxgb4vf_get_regs(struct net_device *dev,
+			     struct ethtool_regs *regs,
+			     void *regbuf)
+{
+	struct adapter *adapter = netdev2adap(dev);
+
+	regs->version = mk_adap_vers(adapter);
+
+	/*
+	 * Fill in register buffer with our register map.
+	 */
+	memset(regbuf, 0, T4VF_REGMAP_SIZE);
+
+	reg_block_dump(adapter, regbuf,
+		       T4VF_SGE_BASE_ADDR + T4VF_MOD_MAP_SGE_FIRST,
+		       T4VF_SGE_BASE_ADDR + T4VF_MOD_MAP_SGE_LAST);
+	reg_block_dump(adapter, regbuf,
+		       T4VF_MPS_BASE_ADDR + T4VF_MOD_MAP_MPS_FIRST,
+		       T4VF_MPS_BASE_ADDR + T4VF_MOD_MAP_MPS_LAST);
+	reg_block_dump(adapter, regbuf,
+		       T4VF_PL_BASE_ADDR + T4VF_MOD_MAP_PL_FIRST,
+		       T4VF_PL_BASE_ADDR + T4VF_MOD_MAP_PL_LAST);
+	reg_block_dump(adapter, regbuf,
+		       T4VF_CIM_BASE_ADDR + T4VF_MOD_MAP_CIM_FIRST,
+		       T4VF_CIM_BASE_ADDR + T4VF_MOD_MAP_CIM_LAST);
+
+	reg_block_dump(adapter, regbuf,
+		       T4VF_MBDATA_BASE_ADDR + T4VF_MBDATA_FIRST,
+		       T4VF_MBDATA_BASE_ADDR + T4VF_MBDATA_LAST);
+}
+
+/*
+ * Report current Wake On LAN settings.
+ */
+static void cxgb4vf_get_wol(struct net_device *dev,
+			    struct ethtool_wolinfo *wol)
+{
+	wol->supported = 0;
+	wol->wolopts = 0;
+	memset(&wol->sopass, 0, sizeof(wol->sopass));
+}
+
+/*
+ * Set TCP Segmentation Offloading feature capabilities.
+ */
+static int cxgb4vf_set_tso(struct net_device *dev, u32 tso)
+{
+	if (tso)
+		dev->features |= NETIF_F_TSO | NETIF_F_TSO6;
+	else
+		dev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
+	return 0;
+}
+
+static struct ethtool_ops cxgb4vf_ethtool_ops = {
+	.get_settings		= cxgb4vf_get_settings,
+	.get_drvinfo		= cxgb4vf_get_drvinfo,
+	.get_msglevel		= cxgb4vf_get_msglevel,
+	.set_msglevel		= cxgb4vf_set_msglevel,
+	.get_ringparam		= cxgb4vf_get_ringparam,
+	.set_ringparam		= cxgb4vf_set_ringparam,
+	.get_coalesce		= cxgb4vf_get_coalesce,
+	.set_coalesce		= cxgb4vf_set_coalesce,
+	.get_pauseparam		= cxgb4vf_get_pauseparam,
+	.get_rx_csum		= cxgb4vf_get_rx_csum,
+	.set_rx_csum		= cxgb4vf_set_rx_csum,
+	.set_tx_csum		= ethtool_op_set_tx_ipv6_csum,
+	.set_sg			= ethtool_op_set_sg,
+	.get_link		= ethtool_op_get_link,
+	.get_strings		= cxgb4vf_get_strings,
+	.phys_id		= cxgb4vf_phys_id,
+	.get_sset_count		= cxgb4vf_get_sset_count,
+	.get_ethtool_stats	= cxgb4vf_get_ethtool_stats,
+	.get_regs_len		= cxgb4vf_get_regs_len,
+	.get_regs		= cxgb4vf_get_regs,
+	.get_wol		= cxgb4vf_get_wol,
+	.set_tso		= cxgb4vf_set_tso,
+};
+
+/*
+ * /sys/kernel/debug/cxgb4vf support code and data.
+ * ================================================
+ */
+
+/*
+ * Show SGE Queue Set information.  We display QPL Queues Sets per line.
+ */
+#define QPL	4
+
+static int sge_qinfo_show(struct seq_file *seq, void *v)
+{
+	struct adapter *adapter = seq->private;
+	int eth_entries = DIV_ROUND_UP(adapter->sge.ethqsets, QPL);
+	int qs, r = (uintptr_t)v - 1;
+
+	if (r)
+		seq_putc(seq, '\n');
+
+	#define S3(fmt_spec, s, v) \
+		do {\
+			seq_printf(seq, "%-12s", s); \
+			for (qs = 0; qs < n; ++qs) \
+				seq_printf(seq, " %16" fmt_spec, v); \
+			seq_putc(seq, '\n'); \
+		} while (0)
+	#define S(s, v)		S3("s", s, v)
+	#define T(s, v)		S3("u", s, txq[qs].v)
+	#define R(s, v)		S3("u", s, rxq[qs].v)
+
+	if (r < eth_entries) {
+		const struct sge_eth_rxq *rxq = &adapter->sge.ethrxq[r * QPL];
+		const struct sge_eth_txq *txq = &adapter->sge.ethtxq[r * QPL];
+		int n = min(QPL, adapter->sge.ethqsets - QPL * r);
+
+		S("QType:", "Ethernet");
+		S("Interface:",
+		  (rxq[qs].rspq.netdev
+		   ? rxq[qs].rspq.netdev->name
+		   : "N/A"));
+		S3("d", "Port:",
+		   (rxq[qs].rspq.netdev
+		    ? ((struct port_info *)
+		       netdev_priv(rxq[qs].rspq.netdev))->port_id
+		    : -1));
+		T("TxQ ID:", q.abs_id);
+		T("TxQ size:", q.size);
+		T("TxQ inuse:", q.in_use);
+		T("TxQ PIdx:", q.pidx);
+		T("TxQ CIdx:", q.cidx);
+		R("RspQ ID:", rspq.abs_id);
+		R("RspQ size:", rspq.size);
+		R("RspQE size:", rspq.iqe_len);
+		S3("u", "Intr delay:", qtimer_val(adapter, &rxq[qs].rspq));
+		S3("u", "Intr pktcnt:",
+		   adapter->sge.counter_val[rxq[qs].rspq.pktcnt_idx]);
+		R("RspQ CIdx:", rspq.cidx);
+		R("RspQ Gen:", rspq.gen);
+		R("FL ID:", fl.abs_id);
+		R("FL size:", fl.size - MIN_FL_RESID);
+		R("FL avail:", fl.avail);
+		R("FL PIdx:", fl.pidx);
+		R("FL CIdx:", fl.cidx);
+		return 0;
+	}
+
+	r -= eth_entries;
+	if (r == 0) {
+		const struct sge_rspq *evtq = &adapter->sge.fw_evtq;
+
+		seq_printf(seq, "%-12s %16s\n", "QType:", "FW event queue");
+		seq_printf(seq, "%-12s %16u\n", "RspQ ID:", evtq->abs_id);
+		seq_printf(seq, "%-12s %16u\n", "Intr delay:",
+			   qtimer_val(adapter, evtq));
+		seq_printf(seq, "%-12s %16u\n", "Intr pktcnt:",
+			   adapter->sge.counter_val[evtq->pktcnt_idx]);
+		seq_printf(seq, "%-12s %16u\n", "RspQ Cidx:", evtq->cidx);
+		seq_printf(seq, "%-12s %16u\n", "RspQ Gen:", evtq->gen);
+	} else if (r == 1) {
+		const struct sge_rspq *intrq = &adapter->sge.intrq;
+
+		seq_printf(seq, "%-12s %16s\n", "QType:", "Interrupt Queue");
+		seq_printf(seq, "%-12s %16u\n", "RspQ ID:", intrq->abs_id);
+		seq_printf(seq, "%-12s %16u\n", "Intr delay:",
+			   qtimer_val(adapter, intrq));
+		seq_printf(seq, "%-12s %16u\n", "Intr pktcnt:",
+			   adapter->sge.counter_val[intrq->pktcnt_idx]);
+		seq_printf(seq, "%-12s %16u\n", "RspQ Cidx:", intrq->cidx);
+		seq_printf(seq, "%-12s %16u\n", "RspQ Gen:", intrq->gen);
+	}
+
+	#undef R
+	#undef T
+	#undef S
+	#undef S3
+
+	return 0;
+}
+
+/*
+ * Return the number of "entries" in our "file".  We group the multi-Queue
+ * sections with QPL Queue Sets per "entry".  The sections of the output are:
+ *
+ *     Ethernet RX/TX Queue Sets
+ *     Firmware Event Queue
+ *     Forwarded Interrupt Queue (if in MSI mode)
+ */
+static int sge_queue_entries(const struct adapter *adapter)
+{
+	return DIV_ROUND_UP(adapter->sge.ethqsets, QPL) + 1 +
+		((adapter->flags & USING_MSI) != 0);
+}
+
+static void *sge_queue_start(struct seq_file *seq, loff_t *pos)
+{
+	int entries = sge_queue_entries(seq->private);
+
+	return *pos < entries ? (void *)((uintptr_t)*pos + 1) : NULL;
+}
+
+static void sge_queue_stop(struct seq_file *seq, void *v)
+{
+}
+
+static void *sge_queue_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	int entries = sge_queue_entries(seq->private);
+
+	++*pos;
+	return *pos < entries ? (void *)((uintptr_t)*pos + 1) : NULL;
+}
+
+static const struct seq_operations sge_qinfo_seq_ops = {
+	.start = sge_queue_start,
+	.next  = sge_queue_next,
+	.stop  = sge_queue_stop,
+	.show  = sge_qinfo_show
+};
+
+static int sge_qinfo_open(struct inode *inode, struct file *file)
+{
+	int res = seq_open(file, &sge_qinfo_seq_ops);
+
+	if (!res) {
+		struct seq_file *seq = file->private_data;
+		seq->private = inode->i_private;
+	}
+	return res;
+}
+
+static const struct file_operations sge_qinfo_debugfs_fops = {
+	.owner   = THIS_MODULE,
+	.open    = sge_qinfo_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release,
+};
+
+/*
+ * Show SGE Queue Set statistics.  We display QPL Queues Sets per line.
+ */
+#define QPL	4
+
+static int sge_qstats_show(struct seq_file *seq, void *v)
+{
+	struct adapter *adapter = seq->private;
+	int eth_entries = DIV_ROUND_UP(adapter->sge.ethqsets, QPL);
+	int qs, r = (uintptr_t)v - 1;
+
+	if (r)
+		seq_putc(seq, '\n');
+
+	#define S3(fmt, s, v) \
+		do { \
+			seq_printf(seq, "%-16s", s); \
+			for (qs = 0; qs < n; ++qs) \
+				seq_printf(seq, " %8" fmt, v); \
+			seq_putc(seq, '\n'); \
+		} while (0)
+	#define S(s, v)		S3("s", s, v)
+
+	#define T3(fmt, s, v)	S3(fmt, s, txq[qs].v)
+	#define T(s, v)		T3("lu", s, v)
+
+	#define R3(fmt, s, v)	S3(fmt, s, rxq[qs].v)
+	#define R(s, v)		R3("lu", s, v)
+
+	if (r < eth_entries) {
+		const struct sge_eth_rxq *rxq = &adapter->sge.ethrxq[r * QPL];
+		const struct sge_eth_txq *txq = &adapter->sge.ethtxq[r * QPL];
+		int n = min(QPL, adapter->sge.ethqsets - QPL * r);
+
+		S("QType:", "Ethernet");
+		S("Interface:",
+		  (rxq[qs].rspq.netdev
+		   ? rxq[qs].rspq.netdev->name
+		   : "N/A"));
+		R3("u", "RspQNullInts", rspq.unhandled_irqs);
+		R("RxPackets:", stats.pkts);
+		R("RxCSO:", stats.rx_cso);
+		R("VLANxtract:", stats.vlan_ex);
+		R("LROmerged:", stats.lro_merged);
+		R("LROpackets:", stats.lro_pkts);
+		R("RxDrops:", stats.rx_drops);
+		T("TSO:", tso);
+		T("TxCSO:", tx_cso);
+		T("VLANins:", vlan_ins);
+		T("TxQFull:", q.stops);
+		T("TxQRestarts:", q.restarts);
+		T("TxMapErr:", mapping_err);
+		R("FLAllocErr:", fl.alloc_failed);
+		R("FLLrgAlcErr:", fl.large_alloc_failed);
+		R("FLStarving:", fl.starving);
+		return 0;
+	}
+
+	r -= eth_entries;
+	if (r == 0) {
+		const struct sge_rspq *evtq = &adapter->sge.fw_evtq;
+
+		seq_printf(seq, "%-8s %16s\n", "QType:", "FW event queue");
+		/* no real response queue statistics available to display */
+		seq_printf(seq, "%-16s %8u\n", "RspQ CIdx:", evtq->cidx);
+		seq_printf(seq, "%-16s %8u\n", "RspQ Gen:", evtq->gen);
+	} else if (r == 1) {
+		const struct sge_rspq *intrq = &adapter->sge.intrq;
+
+		seq_printf(seq, "%-8s %16s\n", "QType:", "Interrupt Queue");
+		/* no real response queue statistics available to display */
+		seq_printf(seq, "%-16s %8u\n", "RspQ CIdx:", intrq->cidx);
+		seq_printf(seq, "%-16s %8u\n", "RspQ Gen:", intrq->gen);
+	}
+
+	#undef R
+	#undef T
+	#undef S
+	#undef R3
+	#undef T3
+	#undef S3
+
+	return 0;
+}
+
+/*
+ * Return the number of "entries" in our "file".  We group the multi-Queue
+ * sections with QPL Queue Sets per "entry".  The sections of the output are:
+ *
+ *     Ethernet RX/TX Queue Sets
+ *     Firmware Event Queue
+ *     Forwarded Interrupt Queue (if in MSI mode)
+ */
+static int sge_qstats_entries(const struct adapter *adapter)
+{
+	return DIV_ROUND_UP(adapter->sge.ethqsets, QPL) + 1 +
+		((adapter->flags & USING_MSI) != 0);
+}
+
+static void *sge_qstats_start(struct seq_file *seq, loff_t *pos)
+{
+	int entries = sge_qstats_entries(seq->private);
+
+	return *pos < entries ? (void *)((uintptr_t)*pos + 1) : NULL;
+}
+
+static void sge_qstats_stop(struct seq_file *seq, void *v)
+{
+}
+
+static void *sge_qstats_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	int entries = sge_qstats_entries(seq->private);
+
+	(*pos)++;
+	return *pos < entries ? (void *)((uintptr_t)*pos + 1) : NULL;
+}
+
+static const struct seq_operations sge_qstats_seq_ops = {
+	.start = sge_qstats_start,
+	.next  = sge_qstats_next,
+	.stop  = sge_qstats_stop,
+	.show  = sge_qstats_show
+};
+
+static int sge_qstats_open(struct inode *inode, struct file *file)
+{
+	int res = seq_open(file, &sge_qstats_seq_ops);
+
+	if (res == 0) {
+		struct seq_file *seq = file->private_data;
+		seq->private = inode->i_private;
+	}
+	return res;
+}
+
+static const struct file_operations sge_qstats_proc_fops = {
+	.owner   = THIS_MODULE,
+	.open    = sge_qstats_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release,
+};
+
+/*
+ * Show PCI-E SR-IOV Virtual Function Resource Limits.
+ */
+static int resources_show(struct seq_file *seq, void *v)
+{
+	struct adapter *adapter = seq->private;
+	struct vf_resources *vfres = &adapter->params.vfres;
+
+	#define S(desc, fmt, var) \
+		seq_printf(seq, "%-60s " fmt "\n", \
+			   desc " (" #var "):", vfres->var)
+
+	S("Virtual Interfaces", "%d", nvi);
+	S("Egress Queues", "%d", neq);
+	S("Ethernet Control", "%d", nethctrl);
+	S("Ingress Queues/w Free Lists/Interrupts", "%d", niqflint);
+	S("Ingress Queues", "%d", niq);
+	S("Traffic Class", "%d", tc);
+	S("Port Access Rights Mask", "%#x", pmask);
+	S("MAC Address Filters", "%d", nexactf);
+	S("Firmware Command Read Capabilities", "%#x", r_caps);
+	S("Firmware Command Write/Execute Capabilities", "%#x", wx_caps);
+
+	#undef S
+
+	return 0;
+}
+
+static int resources_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, resources_show, inode->i_private);
+}
+
+static const struct file_operations resources_proc_fops = {
+	.owner   = THIS_MODULE,
+	.open    = resources_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = single_release,
+};
+
+/*
+ * Show Virtual Interfaces.
+ */
+static int interfaces_show(struct seq_file *seq, void *v)
+{
+	if (v == SEQ_START_TOKEN) {
+		seq_puts(seq, "Interface  Port   VIID\n");
+	} else {
+		struct adapter *adapter = seq->private;
+		int pidx = (uintptr_t)v - 2;
+		struct net_device *dev = adapter->port[pidx];
+		struct port_info *pi = netdev_priv(dev);
+
+		seq_printf(seq, "%9s  %4d  %#5x\n",
+			   dev->name, pi->port_id, pi->viid);
+	}
+	return 0;
+}
+
+static inline void *interfaces_get_idx(struct adapter *adapter, loff_t pos)
+{
+	return pos <= adapter->params.nports
+		? (void *)(uintptr_t)(pos + 1)
+		: NULL;
+}
+
+static void *interfaces_start(struct seq_file *seq, loff_t *pos)
+{
+	return *pos
+		? interfaces_get_idx(seq->private, *pos)
+		: SEQ_START_TOKEN;
+}
+
+static void *interfaces_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	(*pos)++;
+	return interfaces_get_idx(seq->private, *pos);
+}
+
+static void interfaces_stop(struct seq_file *seq, void *v)
+{
+}
+
+static const struct seq_operations interfaces_seq_ops = {
+	.start = interfaces_start,
+	.next  = interfaces_next,
+	.stop  = interfaces_stop,
+	.show  = interfaces_show
+};
+
+static int interfaces_open(struct inode *inode, struct file *file)
+{
+	int res = seq_open(file, &interfaces_seq_ops);
+
+	if (res == 0) {
+		struct seq_file *seq = file->private_data;
+		seq->private = inode->i_private;
+	}
+	return res;
+}
+
+static const struct file_operations interfaces_proc_fops = {
+	.owner   = THIS_MODULE,
+	.open    = interfaces_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release,
+};
+
+/*
+ * /sys/kernel/debugfs/cxgb4vf/ files list.
+ */
+struct cxgb4vf_debugfs_entry {
+	const char *name;		/* name of debugfs node */
+	mode_t mode;			/* file system mode */
+	const struct file_operations *fops;
+};
+
+static struct cxgb4vf_debugfs_entry debugfs_files[] = {
+	{ "sge_qinfo",  S_IRUGO, &sge_qinfo_debugfs_fops },
+	{ "sge_qstats", S_IRUGO, &sge_qstats_proc_fops },
+	{ "resources",  S_IRUGO, &resources_proc_fops },
+	{ "interfaces", S_IRUGO, &interfaces_proc_fops },
+};
+
+/*
+ * Module and device initialization and cleanup code.
+ * ==================================================
+ */
+
+/*
+ * Set up out /sys/kernel/debug/cxgb4vf sub-nodes.  We assume that the
+ * directory (debugfs_root) has already been set up.
+ */
+static int __devinit setup_debugfs(struct adapter *adapter)
+{
+	int i;
+
+	BUG_ON(adapter->debugfs_root == NULL);
+
+	/*
+	 * Debugfs support is best effort.
+	 */
+	for (i = 0; i < ARRAY_SIZE(debugfs_files); i++)
+		(void)debugfs_create_file(debugfs_files[i].name,
+				  debugfs_files[i].mode,
+				  adapter->debugfs_root,
+				  (void *)adapter,
+				  debugfs_files[i].fops);
+
+	return 0;
+}
+
+/*
+ * Tear down the /sys/kernel/debug/cxgb4vf sub-nodes created above.  We leave
+ * it to our caller to tear down the directory (debugfs_root).
+ */
+static void __devexit cleanup_debugfs(struct adapter *adapter)
+{
+	BUG_ON(adapter->debugfs_root == NULL);
+
+	/*
+	 * Unlike our sister routine cleanup_proc(), we don't need to remove
+	 * individual entries because a call will be made to
+	 * debugfs_remove_recursive().  We just need to clean up any ancillary
+	 * persistent state.
+	 */
+	/* nothing to do */
+}
+
+/*
+ * Perform early "adapter" initialization.  This is where we discover what
+ * adapter parameters we're going to be using and initialize basic adapter
+ * hardware support.
+ */
+static int adap_init0(struct adapter *adapter)
+{
+	struct vf_resources *vfres = &adapter->params.vfres;
+	struct sge_params *sge_params = &adapter->params.sge;
+	struct sge *s = &adapter->sge;
+	unsigned int ethqsets;
+	int err;
+
+	/*
+	 * Wait for the device to become ready before proceeding ...
+	 */
+	err = t4vf_wait_dev_ready(adapter);
+	if (err) {
+		dev_err(adapter->pdev_dev, "device didn't become ready:"
+			" err=%d\n", err);
+		return err;
+	}
+
+	/*
+	 * Grab basic operational parameters.  These will predominantly have
+	 * been set up by the Physical Function Driver or will be hard coded
+	 * into the adapter.  We just have to live with them ...  Note that
+	 * we _must_ get our VPD parameters before our SGE parameters because
+	 * we need to know the adapter's core clock from the VPD in order to
+	 * properly decode the SGE Timer Values.
+	 */
+	err = t4vf_get_dev_params(adapter);
+	if (err) {
+		dev_err(adapter->pdev_dev, "unable to retrieve adapter"
+			" device parameters: err=%d\n", err);
+		return err;
+	}
+	err = t4vf_get_vpd_params(adapter);
+	if (err) {
+		dev_err(adapter->pdev_dev, "unable to retrieve adapter"
+			" VPD parameters: err=%d\n", err);
+		return err;
+	}
+	err = t4vf_get_sge_params(adapter);
+	if (err) {
+		dev_err(adapter->pdev_dev, "unable to retrieve adapter"
+			" SGE parameters: err=%d\n", err);
+		return err;
+	}
+	err = t4vf_get_rss_glb_config(adapter);
+	if (err) {
+		dev_err(adapter->pdev_dev, "unable to retrieve adapter"
+			" RSS parameters: err=%d\n", err);
+		return err;
+	}
+	if (adapter->params.rss.mode !=
+	    FW_RSS_GLB_CONFIG_CMD_MODE_BASICVIRTUAL) {
+		dev_err(adapter->pdev_dev, "unable to operate with global RSS"
+			" mode %d\n", adapter->params.rss.mode);
+		return -EINVAL;
+	}
+	err = t4vf_sge_init(adapter);
+	if (err) {
+		dev_err(adapter->pdev_dev, "unable to use adapter parameters:"
+			" err=%d\n", err);
+		return err;
+	}
+
+	/*
+	 * Retrieve our RX interrupt holdoff timer values and counter
+	 * threshold values from the SGE parameters.
+	 */
+	s->timer_val[0] = core_ticks_to_us(adapter,
+		TIMERVALUE0_GET(sge_params->sge_timer_value_0_and_1));
+	s->timer_val[1] = core_ticks_to_us(adapter,
+		TIMERVALUE1_GET(sge_params->sge_timer_value_0_and_1));
+	s->timer_val[2] = core_ticks_to_us(adapter,
+		TIMERVALUE0_GET(sge_params->sge_timer_value_2_and_3));
+	s->timer_val[3] = core_ticks_to_us(adapter,
+		TIMERVALUE1_GET(sge_params->sge_timer_value_2_and_3));
+	s->timer_val[4] = core_ticks_to_us(adapter,
+		TIMERVALUE0_GET(sge_params->sge_timer_value_4_and_5));
+	s->timer_val[5] = core_ticks_to_us(adapter,
+		TIMERVALUE1_GET(sge_params->sge_timer_value_4_and_5));
+
+	s->counter_val[0] =
+		THRESHOLD_0_GET(sge_params->sge_ingress_rx_threshold);
+	s->counter_val[1] =
+		THRESHOLD_1_GET(sge_params->sge_ingress_rx_threshold);
+	s->counter_val[2] =
+		THRESHOLD_2_GET(sge_params->sge_ingress_rx_threshold);
+	s->counter_val[3] =
+		THRESHOLD_3_GET(sge_params->sge_ingress_rx_threshold);
+
+	/*
+	 * Grab our Virtual Interface resource allocation, extract the
+	 * features that we're interested in and do a bit of sanity testing on
+	 * what we discover.
+	 */
+	err = t4vf_get_vfres(adapter);
+	if (err) {
+		dev_err(adapter->pdev_dev, "unable to get virtual interface"
+			" resources: err=%d\n", err);
+		return err;
+	}
+
+	/*
+	 * The number of "ports" which we support is equal to the number of
+	 * Virtual Interfaces with which we've been provisioned.
+	 */
+	adapter->params.nports = vfres->nvi;
+	if (adapter->params.nports > MAX_NPORTS) {
+		dev_warn(adapter->pdev_dev, "only using %d of %d allowed"
+			 " virtual interfaces\n", MAX_NPORTS,
+			 adapter->params.nports);
+		adapter->params.nports = MAX_NPORTS;
+	}
+
+	/*
+	 * We need to reserve a number of the ingress queues with Free List
+	 * and Interrupt capabilities for special interrupt purposes (like
+	 * asynchronous firmware messages, or forwarded interrupts if we're
+	 * using MSI).  The rest of the FL/Intr-capable ingress queues will be
+	 * matched up one-for-one with Ethernet/Control egress queues in order
+	 * to form "Queue Sets" which will be aportioned between the "ports".
+	 * For each Queue Set, we'll need the ability to allocate two Egress
+	 * Contexts -- one for the Ingress Queue Free List and one for the TX
+	 * Ethernet Queue.
+	 */
+	ethqsets = vfres->niqflint - INGQ_EXTRAS;
+	if (vfres->nethctrl != ethqsets) {
+		dev_warn(adapter->pdev_dev, "unequal number of [available]"
+			 " ingress/egress queues (%d/%d); using minimum for"
+			 " number of Queue Sets\n", ethqsets, vfres->nethctrl);
+		ethqsets = min(vfres->nethctrl, ethqsets);
+	}
+	if (vfres->neq < ethqsets*2) {
+		dev_warn(adapter->pdev_dev, "Not enough Egress Contexts (%d)"
+			 " to support Queue Sets (%d); reducing allowed Queue"
+			 " Sets\n", vfres->neq, ethqsets);
+		ethqsets = vfres->neq/2;
+	}
+	if (ethqsets > MAX_ETH_QSETS) {
+		dev_warn(adapter->pdev_dev, "only using %d of %d allowed Queue"
+			 " Sets\n", MAX_ETH_QSETS, adapter->sge.max_ethqsets);
+		ethqsets = MAX_ETH_QSETS;
+	}
+	if (vfres->niq != 0 || vfres->neq > ethqsets*2) {
+		dev_warn(adapter->pdev_dev, "unused resources niq/neq (%d/%d)"
+			 " ignored\n", vfres->niq, vfres->neq - ethqsets*2);
+	}
+	adapter->sge.max_ethqsets = ethqsets;
+
+	/*
+	 * Check for various parameter sanity issues.  Most checks simply
+	 * result in us using fewer resources than our provissioning but we
+	 * do need at least  one "port" with which to work ...
+	 */
+	if (adapter->sge.max_ethqsets < adapter->params.nports) {
+		dev_warn(adapter->pdev_dev, "only using %d of %d available"
+			 " virtual interfaces (too few Queue Sets)\n",
+			 adapter->sge.max_ethqsets, adapter->params.nports);
+		adapter->params.nports = adapter->sge.max_ethqsets;
+	}
+	if (adapter->params.nports == 0) {
+		dev_err(adapter->pdev_dev, "no virtual interfaces configured/"
+			"usable!\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static inline void init_rspq(struct sge_rspq *rspq, u8 timer_idx,
+			     u8 pkt_cnt_idx, unsigned int size,
+			     unsigned int iqe_size)
+{
+	rspq->intr_params = (QINTR_TIMER_IDX(timer_idx) |
+			     (pkt_cnt_idx < SGE_NCOUNTERS ? QINTR_CNT_EN : 0));
+	rspq->pktcnt_idx = (pkt_cnt_idx < SGE_NCOUNTERS
+			    ? pkt_cnt_idx
+			    : 0);
+	rspq->iqe_len = iqe_size;
+	rspq->size = size;
+}
+
+/*
+ * Perform default configuration of DMA queues depending on the number and
+ * type of ports we found and the number of available CPUs.  Most settings can
+ * be modified by the admin via ethtool and cxgbtool prior to the adapter
+ * being brought up for the first time.
+ */
+static void __devinit cfg_queues(struct adapter *adapter)
+{
+	struct sge *s = &adapter->sge;
+	int q10g, n10g, qidx, pidx, qs;
+
+	/*
+	 * We should not be called till we know how many Queue Sets we can
+	 * support.  In particular, this means that we need to know what kind
+	 * of interrupts we'll be using ...
+	 */
+	BUG_ON((adapter->flags & (USING_MSIX|USING_MSI)) == 0);
+
+	/*
+	 * Count the number of 10GbE Virtual Interfaces that we have.
+	 */
+	n10g = 0;
+	for_each_port(adapter, pidx)
+		n10g += is_10g_port(&adap2pinfo(adapter, pidx)->link_cfg);
+
+	/*
+	 * We default to 1 queue per non-10G port and up to # of cores queues
+	 * per 10G port.
+	 */
+	if (n10g == 0)
+		q10g = 0;
+	else {
+		int n1g = (adapter->params.nports - n10g);
+		q10g = (adapter->sge.max_ethqsets - n1g) / n10g;
+		if (q10g > num_online_cpus())
+			q10g = num_online_cpus();
+	}
+
+	/*
+	 * Allocate the "Queue Sets" to the various Virtual Interfaces.
+	 * The layout will be established in setup_sge_queues() when the
+	 * adapter is brough up for the first time.
+	 */
+	qidx = 0;
+	for_each_port(adapter, pidx) {
+		struct port_info *pi = adap2pinfo(adapter, pidx);
+
+		pi->first_qset = qidx;
+		pi->nqsets = is_10g_port(&pi->link_cfg) ? q10g : 1;
+		qidx += pi->nqsets;
+	}
+	s->ethqsets = qidx;
+
+	/*
+	 * Set up default Queue Set parameters ...  Start off with the
+	 * shortest interrupt holdoff timer.
+	 */
+	for (qs = 0; qs < s->max_ethqsets; qs++) {
+		struct sge_eth_rxq *rxq = &s->ethrxq[qs];
+		struct sge_eth_txq *txq = &s->ethtxq[qs];
+
+		init_rspq(&rxq->rspq, 0, 0, 1024, L1_CACHE_BYTES);
+		rxq->fl.size = 72;
+		txq->q.size = 1024;
+	}
+
+	/*
+	 * The firmware event queue is used for link state changes and
+	 * notifications of TX DMA completions.
+	 */
+	init_rspq(&s->fw_evtq, SGE_TIMER_RSTRT_CNTR, 0, 512,
+		  L1_CACHE_BYTES);
+
+	/*
+	 * The forwarded interrupt queue is used when we're in MSI interrupt
+	 * mode.  In this mode all interrupts associated with RX queues will
+	 * be forwarded to a single queue which we'll associate with our MSI
+	 * interrupt vector.  The messages dropped in the forwarded interrupt
+	 * queue will indicate which ingress queue needs servicing ...  This
+	 * queue needs to be large enough to accommodate all of the ingress
+	 * queues which are forwarding their interrupt (+1 to prevent the PIDX
+	 * from equalling the CIDX if every ingress queue has an outstanding
+	 * interrupt).  The queue doesn't need to be any larger because no
+	 * ingress queue will ever have more than one outstanding interrupt at
+	 * any time ...
+	 */
+	init_rspq(&s->intrq, SGE_TIMER_RSTRT_CNTR, 0, MSIX_ENTRIES + 1,
+		  L1_CACHE_BYTES);
+}
+
+/*
+ * Reduce the number of Ethernet queues across all ports to at most n.
+ * n provides at least one queue per port.
+ */
+static void __devinit reduce_ethqs(struct adapter *adapter, int n)
+{
+	int i;
+	struct port_info *pi;
+
+	/*
+	 * While we have too many active Ether Queue Sets, interate across the
+	 * "ports" and reduce their individual Queue Set allocations.
+	 */
+	BUG_ON(n < adapter->params.nports);
+	while (n < adapter->sge.ethqsets)
+		for_each_port(adapter, i) {
+			pi = adap2pinfo(adapter, i);
+			if (pi->nqsets > 1) {
+				pi->nqsets--;
+				adapter->sge.ethqsets--;
+				if (adapter->sge.ethqsets <= n)
+					break;
+			}
+		}
+
+	/*
+	 * Reassign the starting Queue Sets for each of the "ports" ...
+	 */
+	n = 0;
+	for_each_port(adapter, i) {
+		pi = adap2pinfo(adapter, i);
+		pi->first_qset = n;
+		n += pi->nqsets;
+	}
+}
+
+/*
+ * We need to grab enough MSI-X vectors to cover our interrupt needs.  Ideally
+ * we get a separate MSI-X vector for every "Queue Set" plus any extras we
+ * need.  Minimally we need one for every Virtual Interface plus those needed
+ * for our "extras".  Note that this process may lower the maximum number of
+ * allowed Queue Sets ...
+ */
+static int __devinit enable_msix(struct adapter *adapter)
+{
+	int i, err, want, need;
+	struct msix_entry entries[MSIX_ENTRIES];
+	struct sge *s = &adapter->sge;
+
+	for (i = 0; i < MSIX_ENTRIES; ++i)
+		entries[i].entry = i;
+
+	/*
+	 * We _want_ enough MSI-X interrupts to cover all of our "Queue Sets"
+	 * plus those needed for our "extras" (for example, the firmware
+	 * message queue).  We _need_ at least one "Queue Set" per Virtual
+	 * Interface plus those needed for our "extras".  So now we get to see
+	 * if the song is right ...
+	 */
+	want = s->max_ethqsets + MSIX_EXTRAS;
+	need = adapter->params.nports + MSIX_EXTRAS;
+	while ((err = pci_enable_msix(adapter->pdev, entries, want)) >= need)
+		want = err;
+
+	if (err == 0) {
+		int nqsets = want - MSIX_EXTRAS;
+		if (nqsets < s->max_ethqsets) {
+			dev_warn(adapter->pdev_dev, "only enough MSI-X vectors"
+				 " for %d Queue Sets\n", nqsets);
+			s->max_ethqsets = nqsets;
+			if (nqsets < s->ethqsets)
+				reduce_ethqs(adapter, nqsets);
+		}
+		for (i = 0; i < want; ++i)
+			adapter->msix_info[i].vec = entries[i].vector;
+	} else if (err > 0) {
+		pci_disable_msix(adapter->pdev);
+		dev_info(adapter->pdev_dev, "only %d MSI-X vectors left,"
+			 " not using MSI-X\n", err);
+	}
+	return err;
+}
+
+#ifdef HAVE_NET_DEVICE_OPS
+static const struct net_device_ops cxgb4vf_netdev_ops	= {
+	.ndo_open		= cxgb4vf_open,
+	.ndo_stop		= cxgb4vf_stop,
+	.ndo_start_xmit		= t4vf_eth_xmit,
+	.ndo_get_stats		= cxgb4vf_get_stats,
+	.ndo_set_rx_mode	= cxgb4vf_set_rxmode,
+	.ndo_set_mac_address	= cxgb4vf_set_mac_addr,
+	.ndo_select_queue	= cxgb4vf_select_queue,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_do_ioctl		= cxgb4vf_do_ioctl,
+	.ndo_change_mtu		= cxgb4vf_change_mtu,
+	.ndo_vlan_rx_register	= cxgb4vf_vlan_rx_register,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= cxgb4vf_poll_controller,
+#endif
+};
+#endif
+
+/*
+ * "Probe" a device: initialize a device and construct all kernel and driver
+ * state needed to manage the device.  This routine is called "init_one" in
+ * the PF Driver ...
+ */
+static int __devinit cxgb4vf_pci_probe(struct pci_dev *pdev,
+				       const struct pci_device_id *ent)
+{
+	static int version_printed;
+
+	int pci_using_dac;
+	int err, pidx;
+	unsigned int pmask;
+	struct adapter *adapter;
+	struct port_info *pi;
+	struct net_device *netdev;
+
+	/*
+	 * Vet our module parameters.
+	 */
+	if (msi != MSI_MSIX && msi != MSI_MSI) {
+		dev_err(&pdev->dev, "bad module parameter msi=%d; must be %d"
+			" (MSI-X or MSI) or %d (MSI)\n", msi, MSI_MSIX,
+			MSI_MSI);
+		err = -EINVAL;
+		goto err_out;
+	}
+
+	/*
+	 * Print our driver banner the first time we're called to initialize a
+	 * device.
+	 */
+	if (version_printed == 0) {
+		printk(KERN_INFO "%s - version %s\n", DRV_DESC, DRV_VERSION);
+		version_printed = 1;
+	}
+
+	/*
+	 * Reserve PCI resources for the device.  If we can't get them some
+	 * other driver may have already claimed the device ...
+	 */
+	err = pci_request_regions(pdev, KBUILD_MODNAME);
+	if (err) {
+		dev_err(&pdev->dev, "cannot obtain PCI resources\n");
+		return err;
+	}
+
+	/*
+	 * Initialize generic PCI device state.
+	 */
+	err = pci_enable_device(pdev);
+	if (err) {
+		dev_err(&pdev->dev, "cannot enable PCI device\n");
+		goto err_release_regions;
+	}
+
+	/*
+	 * Set up our DMA mask: try for 64-bit address masking first and
+	 * fall back to 32-bit if we can't get 64 bits ...
+	 */
+	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
+	if (err == 0) {
+		err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
+		if (err) {
+			dev_err(&pdev->dev, "unable to obtain 64-bit DMA for"
+				" coherent allocations\n");
+			goto err_disable_device;
+		}
+		pci_using_dac = 1;
+	} else {
+		err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+		if (err != 0) {
+			dev_err(&pdev->dev, "no usable DMA configuration\n");
+			goto err_disable_device;
+		}
+		pci_using_dac = 0;
+	}
+
+	/*
+	 * Enable bus mastering for the device ...
+	 */
+	pci_set_master(pdev);
+
+	/*
+	 * Allocate our adapter data structure and attach it to the device.
+	 */
+	adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
+	if (!adapter) {
+		err = -ENOMEM;
+		goto err_disable_device;
+	}
+	pci_set_drvdata(pdev, adapter);
+	adapter->pdev = pdev;
+	adapter->pdev_dev = &pdev->dev;
+
+	/*
+	 * Initialize SMP data synchronization resources.
+	 */
+	spin_lock_init(&adapter->stats_lock);
+
+	/*
+	 * Map our I/O registers in BAR0.
+	 */
+	adapter->regs = pci_ioremap_bar(pdev, 0);
+	if (!adapter->regs) {
+		dev_err(&pdev->dev, "cannot map device registers\n");
+		err = -ENOMEM;
+		goto err_free_adapter;
+	}
+
+	/*
+	 * Initialize adapter level features.
+	 */
+	adapter->name = pci_name(pdev);
+	adapter->msg_enable = dflt_msg_enable;
+	err = adap_init0(adapter);
+	if (err)
+		goto err_unmap_bar;
+
+	/*
+	 * Allocate our "adapter ports" and stitch everything together.
+	 */
+	pmask = adapter->params.vfres.pmask;
+	for_each_port(adapter, pidx) {
+		int port_id, viid;
+
+		/*
+		 * We simplistically allocate our virtual interfaces
+		 * sequentially across the port numbers to which we have
+		 * access rights.  This should be configurable in some manner
+		 * ...
+		 */
+		if (pmask == 0)
+			break;
+		port_id = ffs(pmask) - 1;
+		pmask &= ~(1 << port_id);
+		viid = t4vf_alloc_vi(adapter, port_id);
+		if (viid < 0) {
+			dev_err(&pdev->dev, "cannot allocate VI for port %d:"
+				" err=%d\n", port_id, viid);
+			err = viid;
+			goto err_free_dev;
+		}
+
+		/*
+		 * Allocate our network device and stitch things together.
+		 */
+		netdev = alloc_etherdev_mq(sizeof(struct port_info),
+					   MAX_PORT_QSETS);
+		if (netdev == NULL) {
+			dev_err(&pdev->dev, "cannot allocate netdev for"
+				" port %d\n", port_id);
+			t4vf_free_vi(adapter, viid);
+			err = -ENOMEM;
+			goto err_free_dev;
+		}
+		adapter->port[pidx] = netdev;
+		SET_NETDEV_DEV(netdev, &pdev->dev);
+		pi = netdev_priv(netdev);
+		pi->adapter = adapter;
+		pi->pidx = pidx;
+		pi->port_id = port_id;
+		pi->viid = viid;
+
+		/*
+		 * Initialize the starting state of our "port" and register
+		 * it.
+		 */
+		pi->xact_addr_filt = -1;
+		pi->rx_offload = RX_CSO;
+		netif_carrier_off(netdev);
+		netif_tx_stop_all_queues(netdev);
+		netdev->irq = pdev->irq;
+
+		netdev->features = (NETIF_F_SG | NETIF_F_TSO | NETIF_F_TSO6 |
+				    NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
+				    NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX |
+				    NETIF_F_GRO);
+		if (pci_using_dac)
+			netdev->features |= NETIF_F_HIGHDMA;
+		netdev->vlan_features =
+			(netdev->features &
+			 ~(NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX));
+
+#ifdef HAVE_NET_DEVICE_OPS
+		netdev->netdev_ops = &cxgb4vf_netdev_ops;
+#else
+		netdev->vlan_rx_register = cxgb4vf_vlan_rx_register;
+		netdev->open = cxgb4vf_open;
+		netdev->stop = cxgb4vf_stop;
+		netdev->hard_start_xmit = t4vf_eth_xmit;
+		netdev->get_stats = cxgb4vf_get_stats;
+		netdev->set_rx_mode = cxgb4vf_set_rxmode;
+		netdev->do_ioctl = cxgb4vf_do_ioctl;
+		netdev->change_mtu = cxgb4vf_change_mtu;
+		netdev->set_mac_address = cxgb4vf_set_mac_addr;
+		netdev->select_queue = cxgb4vf_select_queue;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+		netdev->poll_controller = cxgb4vf_poll_controller;
+#endif
+#endif
+		SET_ETHTOOL_OPS(netdev, &cxgb4vf_ethtool_ops);
+
+		/*
+		 * Initialize the hardware/software state for the port.
+		 */
+		err = t4vf_port_init(adapter, pidx);
+		if (err) {
+			dev_err(&pdev->dev, "cannot initialize port %d\n",
+				pidx);
+			goto err_free_dev;
+		}
+	}
+
+	/*
+	 * The "card" is now ready to go.  If any errors occur during device
+	 * registration we do not fail the whole "card" but rather proceed
+	 * only with the ports we manage to register successfully.  However we
+	 * must register at least one net device.
+	 */
+	for_each_port(adapter, pidx) {
+		netdev = adapter->port[pidx];
+		if (netdev == NULL)
+			continue;
+
+		err = register_netdev(netdev);
+		if (err) {
+			dev_warn(&pdev->dev, "cannot register net device %s,"
+				 " skipping\n", netdev->name);
+			continue;
+		}
+
+		set_bit(pidx, &adapter->registered_device_map);
+	}
+	if (adapter->registered_device_map == 0) {
+		dev_err(&pdev->dev, "could not register any net devices\n");
+		goto err_free_dev;
+	}
+
+	/*
+	 * Set up our debugfs entries.
+	 */
+	if (cxgb4vf_debugfs_root) {
+		adapter->debugfs_root =
+			debugfs_create_dir(pci_name(pdev),
+					   cxgb4vf_debugfs_root);
+		if (adapter->debugfs_root == NULL)
+			dev_warn(&pdev->dev, "could not create debugfs"
+				 " directory");
+		else
+			setup_debugfs(adapter);
+	}
+
+	/*
+	 * See what interrupts we'll be using.  If we've been configured to
+	 * use MSI-X interrupts, try to enable them but fall back to using
+	 * MSI interrupts if we can't enable MSI-X interrupts.  If we can't
+	 * get MSI interrupts we bail with the error.
+	 */
+	if (msi == MSI_MSIX && enable_msix(adapter) == 0)
+		adapter->flags |= USING_MSIX;
+	else {
+		err = pci_enable_msi(pdev);
+		if (err) {
+			dev_err(&pdev->dev, "Unable to allocate %s interrupts;"
+				" err=%d\n",
+				msi == MSI_MSIX ? "MSI-X or MSI" : "MSI", err);
+			goto err_free_debugfs;
+		}
+		adapter->flags |= USING_MSI;
+	}
+
+	/*
+	 * Now that we know how many "ports" we have and what their types are,
+	 * and how many Queue Sets we can support, we can configure our queue
+	 * resources.
+	 */
+	cfg_queues(adapter);
+
+	/*
+	 * Print a short notice on the existance and configuration of the new
+	 * VF network device ...
+	 */
+	for_each_port(adapter, pidx) {
+		dev_info(adapter->pdev_dev, "%s: Chelsio VF NIC PCIe %s\n",
+			 adapter->port[pidx]->name,
+			 (adapter->flags & USING_MSIX) ? "MSI-X" :
+			 (adapter->flags & USING_MSI)  ? "MSI" : "");
+	}
+
+	/*
+	 * Return success!
+	 */
+	return 0;
+
+	/*
+	 * Error recovery and exit code.  Unwind state that's been created
+	 * so far and return the error.
+	 */
+
+err_free_debugfs:
+	if (adapter->debugfs_root) {
+		cleanup_debugfs(adapter);
+		debugfs_remove_recursive(adapter->debugfs_root);
+	}
+
+err_free_dev:
+	for_each_port(adapter, pidx) {
+		netdev = adapter->port[pidx];
+		if (netdev == NULL)
+			continue;
+		pi = netdev_priv(netdev);
+		t4vf_free_vi(adapter, pi->viid);
+		if (test_bit(pidx, &adapter->registered_device_map))
+			unregister_netdev(netdev);
+		free_netdev(netdev);
+	}
+
+err_unmap_bar:
+	iounmap(adapter->regs);
+
+err_free_adapter:
+	kfree(adapter);
+	pci_set_drvdata(pdev, NULL);
+
+err_disable_device:
+	pci_disable_device(pdev);
+	pci_clear_master(pdev);
+
+err_release_regions:
+	pci_release_regions(pdev);
+	pci_set_drvdata(pdev, NULL);
+
+err_out:
+	return err;
+}
+
+/*
+ * "Remove" a device: tear down all kernel and driver state created in the
+ * "probe" routine and quiesce the device (disable interrupts, etc.).  (Note
+ * that this is called "remove_one" in the PF Driver.)
+ */
+static void __devexit cxgb4vf_pci_remove(struct pci_dev *pdev)
+{
+	struct adapter *adapter = pci_get_drvdata(pdev);
+
+	/*
+	 * Tear down driver state associated with device.
+	 */
+	if (adapter) {
+		int pidx;
+
+		/*
+		 * Stop all of our activity.  Unregister network port,
+		 * disable interrupts, etc.
+		 */
+		for_each_port(adapter, pidx)
+			if (test_bit(pidx, &adapter->registered_device_map))
+				unregister_netdev(adapter->port[pidx]);
+		t4vf_sge_stop(adapter);
+		if (adapter->flags & USING_MSIX) {
+			pci_disable_msix(adapter->pdev);
+			adapter->flags &= ~USING_MSIX;
+		} else if (adapter->flags & USING_MSI) {
+			pci_disable_msi(adapter->pdev);
+			adapter->flags &= ~USING_MSI;
+		}
+
+		/*
+		 * Tear down our debugfs entries.
+		 */
+		if (adapter->debugfs_root) {
+			cleanup_debugfs(adapter);
+			debugfs_remove_recursive(adapter->debugfs_root);
+		}
+
+		/*
+		 * Free all of the various resources which we've acquired ...
+		 */
+		t4vf_free_sge_resources(adapter);
+		for_each_port(adapter, pidx) {
+			struct net_device *netdev = adapter->port[pidx];
+			struct port_info *pi;
+
+			if (netdev == NULL)
+				continue;
+
+			pi = netdev_priv(netdev);
+			t4vf_free_vi(adapter, pi->viid);
+			free_netdev(netdev);
+		}
+		iounmap(adapter->regs);
+		kfree(adapter);
+		pci_set_drvdata(pdev, NULL);
+	}
+
+	/*
+	 * Disable the device and release its PCI resources.
+	 */
+	pci_disable_device(pdev);
+	pci_clear_master(pdev);
+	pci_release_regions(pdev);
+}
+
+/*
+ * PCI Device registration data structures.
+ */
+#define CH_DEVICE(devid, idx) \
+	{ PCI_VENDOR_ID_CHELSIO, devid, PCI_ANY_ID, PCI_ANY_ID, 0, 0, idx }
+
+static struct pci_device_id cxgb4vf_pci_tbl[] = {
+	CH_DEVICE(0xb000, 0),	/* PE10K FPGA */
+	CH_DEVICE(0x4800, 0),	/* T440-dbg */
+	CH_DEVICE(0x4801, 0),	/* T420-cr */
+	CH_DEVICE(0x4802, 0),	/* T422-cr */
+	{ 0, }
+};
+
+MODULE_DESCRIPTION(DRV_DESC);
+MODULE_AUTHOR("Chelsio Communications");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_VERSION(DRV_VERSION);
+MODULE_DEVICE_TABLE(pci, cxgb4vf_pci_tbl);
+
+static struct pci_driver cxgb4vf_driver = {
+	.name		= KBUILD_MODNAME,
+	.id_table	= cxgb4vf_pci_tbl,
+	.probe		= cxgb4vf_pci_probe,
+	.remove		= __devexit_p(cxgb4vf_pci_remove),
+};
+
+/*
+ * Initialize global driver state.
+ */
+static int __init cxgb4vf_module_init(void)
+{
+	int ret;
+
+	/* Debugfs support is optional, just warn if this fails */
+	cxgb4vf_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
+	if (!cxgb4vf_debugfs_root)
+		printk(KERN_WARNING KBUILD_MODNAME ": could not create"
+		       " debugfs entry, continuing\n");
+
+	ret = pci_register_driver(&cxgb4vf_driver);
+	if (ret < 0)
+		debugfs_remove(cxgb4vf_debugfs_root);
+	return ret;
+}
+
+/*
+ * Tear down global driver state.
+ */
+static void __exit cxgb4vf_module_exit(void)
+{
+	pci_unregister_driver(&cxgb4vf_driver);
+	debugfs_remove(cxgb4vf_debugfs_root);
+}
+
+module_init(cxgb4vf_module_init);
+module_exit(cxgb4vf_module_exit);