/*
 * This file is part of the Chelsio T4 Ethernet driver for Linux.
 *
 * Copyright (c) 2003-2014 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/bitmap.h>
#include <linux/crc32.h>
#include <linux/ctype.h>
#include <linux/debugfs.h>
#include <linux/err.h>
#include <linux/etherdevice.h>
#include <linux/firmware.h>
#include <linux/if.h>
#include <linux/if_vlan.h>
#include <linux/init.h>
#include <linux/log2.h>
#include <linux/mdio.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/aer.h>
#include <linux/rtnetlink.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/sockios.h>
#include <linux/vmalloc.h>
#include <linux/workqueue.h>
#include <net/neighbour.h>
#include <net/netevent.h>
#include <net/addrconf.h>
#include <net/bonding.h>
#include <net/addrconf.h>
#include <asm/uaccess.h>

#include "cxgb4.h"
#include "t4_regs.h"
#include "t4_values.h"
#include "t4_msg.h"
#include "t4fw_api.h"
#include "t4fw_version.h"
#include "cxgb4_dcb.h"
#include "cxgb4_debugfs.h"
#include "clip_tbl.h"
#include "l2t.h"

char cxgb4_driver_name[] = KBUILD_MODNAME;

#ifdef DRV_VERSION
#undef DRV_VERSION
#endif
#define DRV_VERSION "2.0.0-ko"
const char cxgb4_driver_version[] = DRV_VERSION;
#define DRV_DESC "Chelsio T4/T5/T6 Network Driver"

/* Host shadow copy of ingress filter entry.  This is in host native format
 * and doesn't match the ordering or bit order, etc. of the hardware of the
 * firmware command.  The use of bit-field structure elements is purely to
 * remind ourselves of the field size limitations and save memory in the case
 * where the filter table is large.
 */
struct filter_entry {
	/* Administrative fields for filter.
	 */
	u32 valid:1;            /* filter allocated and valid */
	u32 locked:1;           /* filter is administratively locked */

	u32 pending:1;          /* filter action is pending firmware reply */
	u32 smtidx:8;           /* Source MAC Table index for smac */
	struct l2t_entry *l2t;  /* Layer Two Table entry for dmac */

	/* The filter itself.  Most of this is a straight copy of information
	 * provided by the extended ioctl().  Some fields are translated to
	 * internal forms -- for instance the Ingress Queue ID passed in from
	 * the ioctl() is translated into the Absolute Ingress Queue ID.
	 */
	struct ch_filter_specification fs;
};

#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)

/* Macros needed to support the PCI Device ID Table ...
 */
#define CH_PCI_DEVICE_ID_TABLE_DEFINE_BEGIN \
	static const struct pci_device_id cxgb4_pci_tbl[] = {
#define CH_PCI_DEVICE_ID_FUNCTION 0x4

/* Include PCI Device IDs for both PF4 and PF0-3 so our PCI probe() routine is
 * called for both.
 */
#define CH_PCI_DEVICE_ID_FUNCTION2 0x0

#define CH_PCI_ID_TABLE_ENTRY(devid) \
		{PCI_VDEVICE(CHELSIO, (devid)), 4}

#define CH_PCI_DEVICE_ID_TABLE_DEFINE_END \
		{ 0, } \
	}

#include "t4_pci_id_tbl.h"

#define FW4_FNAME "cxgb4/t4fw.bin"
#define FW5_FNAME "cxgb4/t5fw.bin"
#define FW6_FNAME "cxgb4/t6fw.bin"
#define FW4_CFNAME "cxgb4/t4-config.txt"
#define FW5_CFNAME "cxgb4/t5-config.txt"
#define FW6_CFNAME "cxgb4/t6-config.txt"
#define PHY_AQ1202_FIRMWARE "cxgb4/aq1202_fw.cld"
#define PHY_BCM84834_FIRMWARE "cxgb4/bcm8483.bin"
#define PHY_AQ1202_DEVICEID 0x4409
#define PHY_BCM84834_DEVICEID 0x4486

MODULE_DESCRIPTION(DRV_DESC);
MODULE_AUTHOR("Chelsio Communications");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(DRV_VERSION);
MODULE_DEVICE_TABLE(pci, cxgb4_pci_tbl);
MODULE_FIRMWARE(FW4_FNAME);
MODULE_FIRMWARE(FW5_FNAME);
MODULE_FIRMWARE(FW6_FNAME);

/*
 * Normally we're willing to become the firmware's Master PF but will be happy
 * if another PF has already become the Master and initialized the adapter.
 * Setting "force_init" will cause this driver to forcibly establish itself as
 * the Master PF and initialize the adapter.
 */
static uint force_init;

module_param(force_init, uint, 0644);
MODULE_PARM_DESC(force_init, "Forcibly become Master PF and initialize adapter,"
		 "deprecated parameter");

static int dflt_msg_enable = DFLT_MSG_ENABLE;

module_param(dflt_msg_enable, int, 0644);
MODULE_PARM_DESC(dflt_msg_enable, "Chelsio T4 default message enable bitmap");

/*
 * The driver uses the best interrupt scheme available on a platform in the
 * order MSI-X, MSI, legacy INTx interrupts.  This parameter determines which
 * of these schemes the driver may consider as follows:
 *
 * msi = 2: choose from among all three options
 * msi = 1: only consider MSI and INTx interrupts
 * msi = 0: force INTx interrupts
 */
static int msi = 2;

module_param(msi, int, 0644);
MODULE_PARM_DESC(msi, "whether to use INTx (0), MSI (1) or MSI-X (2)");

/*
 * Normally we tell the chip to deliver Ingress Packets into our DMA buffers
 * offset by 2 bytes in order to have the IP headers line up on 4-byte
 * boundaries.  This is a requirement for many architectures which will throw
 * a machine check fault if an attempt is made to access one of the 4-byte IP
 * header fields on a non-4-byte boundary.  And it's a major performance issue
 * even on some architectures which allow it like some implementations of the
 * x86 ISA.  However, some architectures don't mind this and for some very
 * edge-case performance sensitive applications (like forwarding large volumes
 * of small packets), setting this DMA offset to 0 will decrease the number of
 * PCI-E Bus transfers enough to measurably affect performance.
 */
static int rx_dma_offset = 2;

#ifdef CONFIG_PCI_IOV
/* Configure the number of PCI-E Virtual Function which are to be instantiated
 * on SR-IOV Capable Physical Functions.
 */
static unsigned int num_vf[NUM_OF_PF_WITH_SRIOV];

module_param_array(num_vf, uint, NULL, 0644);
MODULE_PARM_DESC(num_vf, "number of VFs for each of PFs 0-3");
#endif

/* TX Queue select used to determine what algorithm to use for selecting TX
 * queue. Select between the kernel provided function (select_queue=0) or user
 * cxgb_select_queue function (select_queue=1)
 *
 * Default: select_queue=0
 */
static int select_queue;
module_param(select_queue, int, 0644);
MODULE_PARM_DESC(select_queue,
		 "Select between kernel provided method of selecting or driver method of selecting TX queue. Default is kernel method.");

static struct dentry *cxgb4_debugfs_root;

static LIST_HEAD(adapter_list);
static DEFINE_MUTEX(uld_mutex);
/* Adapter list to be accessed from atomic context */
static LIST_HEAD(adap_rcu_list);
static DEFINE_SPINLOCK(adap_rcu_lock);
static struct cxgb4_uld_info ulds[CXGB4_ULD_MAX];
static const char *uld_str[] = { "RDMA", "iSCSI" };

static void link_report(struct net_device *dev)
{
	if (!netif_carrier_ok(dev))
		netdev_info(dev, "link down\n");
	else {
		static const char *fc[] = { "no", "Rx", "Tx", "Tx/Rx" };

		const char *s;
		const struct port_info *p = netdev_priv(dev);

		switch (p->link_cfg.speed) {
		case 10000:
			s = "10Gbps";
			break;
		case 1000:
			s = "1000Mbps";
			break;
		case 100:
			s = "100Mbps";
			break;
		case 40000:
			s = "40Gbps";
			break;
		default:
			pr_info("%s: unsupported speed: %d\n",
				dev->name, p->link_cfg.speed);
			return;
		}

		netdev_info(dev, "link up, %s, full-duplex, %s PAUSE\n", s,
			    fc[p->link_cfg.fc]);
	}
}

#ifdef CONFIG_CHELSIO_T4_DCB
/* Set up/tear down Data Center Bridging Priority mapping for a net device. */
static void dcb_tx_queue_prio_enable(struct net_device *dev, int enable)
{
	struct port_info *pi = netdev_priv(dev);
	struct adapter *adap = pi->adapter;
	struct sge_eth_txq *txq = &adap->sge.ethtxq[pi->first_qset];
	int i;

	/* We use a simple mapping of Port TX Queue Index to DCB
	 * Priority when we're enabling DCB.
	 */
	for (i = 0; i < pi->nqsets; i++, txq++) {
		u32 name, value;
		int err;

		name = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DMAQ) |
			FW_PARAMS_PARAM_X_V(
				FW_PARAMS_PARAM_DMAQ_EQ_DCBPRIO_ETH) |
			FW_PARAMS_PARAM_YZ_V(txq->q.cntxt_id));
		value = enable ? i : 0xffffffff;

		/* Since we can be called while atomic (from "interrupt
		 * level") we need to issue the Set Parameters Commannd
		 * without sleeping (timeout < 0).
		 */
		err = t4_set_params_timeout(adap, adap->mbox, adap->pf, 0, 1,
					    &name, &value,
					    -FW_CMD_MAX_TIMEOUT);

		if (err)
			dev_err(adap->pdev_dev,
				"Can't %s DCB Priority on port %d, TX Queue %d: err=%d\n",
				enable ? "set" : "unset", pi->port_id, i, -err);
		else
			txq->dcb_prio = value;
	}
}
#endif /* CONFIG_CHELSIO_T4_DCB */

void t4_os_link_changed(struct adapter *adapter, int port_id, int link_stat)
{
	struct net_device *dev = adapter->port[port_id];

	/* Skip changes from disabled ports. */
	if (netif_running(dev) && link_stat != netif_carrier_ok(dev)) {
		if (link_stat)
			netif_carrier_on(dev);
		else {
#ifdef CONFIG_CHELSIO_T4_DCB
			cxgb4_dcb_state_init(dev);
			dcb_tx_queue_prio_enable(dev, false);
#endif /* CONFIG_CHELSIO_T4_DCB */
			netif_carrier_off(dev);
		}

		link_report(dev);
	}
}

void t4_os_portmod_changed(const struct adapter *adap, int port_id)
{
	static const char *mod_str[] = {
		NULL, "LR", "SR", "ER", "passive DA", "active DA", "LRM"
	};

	const struct net_device *dev = adap->port[port_id];
	const struct port_info *pi = netdev_priv(dev);

	if (pi->mod_type == FW_PORT_MOD_TYPE_NONE)
		netdev_info(dev, "port module unplugged\n");
	else if (pi->mod_type < ARRAY_SIZE(mod_str))
		netdev_info(dev, "%s module inserted\n", mod_str[pi->mod_type]);
}

/*
 * 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 netdev_hw_addr *ha;
	int uc_cnt = netdev_uc_count(dev);
	int mc_cnt = netdev_mc_count(dev);
	const struct port_info *pi = netdev_priv(dev);
	unsigned int mb = pi->adapter->pf;

	/* first do the secondary unicast addresses */
	netdev_for_each_uc_addr(ha, dev) {
		addr[naddr++] = ha->addr;
		if (--uc_cnt == 0 || naddr >= ARRAY_SIZE(addr)) {
			ret = t4_alloc_mac_filt(pi->adapter, mb, pi->viid, free,
					naddr, addr, filt_idx, &uhash, sleep);
			if (ret < 0)
				return ret;

			free = false;
			naddr = 0;
		}
	}

	/* next set up the multicast addresses */
	netdev_for_each_mc_addr(ha, dev) {
		addr[naddr++] = ha->addr;
		if (--mc_cnt == 0 || naddr >= ARRAY_SIZE(addr)) {
			ret = t4_alloc_mac_filt(pi->adapter, mb, pi->viid, free,
					naddr, addr, filt_idx, &mhash, sleep);
			if (ret < 0)
				return ret;

			free = false;
			naddr = 0;
		}
	}

	return t4_set_addr_hash(pi->adapter, mb, pi->viid, uhash != 0,
				uhash | mhash, sleep);
}

int dbfifo_int_thresh = 10; /* 10 == 640 entry threshold */
module_param(dbfifo_int_thresh, int, 0644);
MODULE_PARM_DESC(dbfifo_int_thresh, "doorbell fifo interrupt threshold");

/*
 * usecs to sleep while draining the dbfifo
 */
static int dbfifo_drain_delay = 1000;
module_param(dbfifo_drain_delay, int, 0644);
MODULE_PARM_DESC(dbfifo_drain_delay,
		 "usecs to sleep while draining the dbfifo");

/*
 * 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 = t4_set_rxmode(pi->adapter, pi->adapter->pf, pi->viid, mtu,
				    (dev->flags & IFF_PROMISC) ? 1 : 0,
				    (dev->flags & IFF_ALLMULTI) ? 1 : 0, 1, -1,
				    sleep_ok);
	return ret;
}

/**
 *	link_start - enable a port
 *	@dev: the port to enable
 *
 *	Performs the MAC and PHY actions needed to enable a port.
 */
static int link_start(struct net_device *dev)
{
	int ret;
	struct port_info *pi = netdev_priv(dev);
	unsigned int mb = pi->adapter->pf;

	/*
	 * We do not set address filters and promiscuity here, the stack does
	 * that step explicitly.
	 */
	ret = t4_set_rxmode(pi->adapter, mb, pi->viid, dev->mtu, -1, -1, -1,
			    !!(dev->features & NETIF_F_HW_VLAN_CTAG_RX), true);
	if (ret == 0) {
		ret = t4_change_mac(pi->adapter, mb, pi->viid,
				    pi->xact_addr_filt, dev->dev_addr, true,
				    true);
		if (ret >= 0) {
			pi->xact_addr_filt = ret;
			ret = 0;
		}
	}
	if (ret == 0)
		ret = t4_link_l1cfg(pi->adapter, mb, pi->tx_chan,
				    &pi->link_cfg);
	if (ret == 0) {
		local_bh_disable();
		ret = t4_enable_vi_params(pi->adapter, mb, pi->viid, true,
					  true, CXGB4_DCB_ENABLED);
		local_bh_enable();
	}

	return ret;
}

int cxgb4_dcb_enabled(const struct net_device *dev)
{
#ifdef CONFIG_CHELSIO_T4_DCB
	struct port_info *pi = netdev_priv(dev);

	if (!pi->dcb.enabled)
		return 0;

	return ((pi->dcb.state == CXGB4_DCB_STATE_FW_ALLSYNCED) ||
		(pi->dcb.state == CXGB4_DCB_STATE_HOST));
#else
	return 0;
#endif
}
EXPORT_SYMBOL(cxgb4_dcb_enabled);

#ifdef CONFIG_CHELSIO_T4_DCB
/* Handle a Data Center Bridging update message from the firmware. */
static void dcb_rpl(struct adapter *adap, const struct fw_port_cmd *pcmd)
{
	int port = FW_PORT_CMD_PORTID_G(ntohl(pcmd->op_to_portid));
	struct net_device *dev = adap->port[port];
	int old_dcb_enabled = cxgb4_dcb_enabled(dev);
	int new_dcb_enabled;

	cxgb4_dcb_handle_fw_update(adap, pcmd);
	new_dcb_enabled = cxgb4_dcb_enabled(dev);

	/* If the DCB has become enabled or disabled on the port then we're
	 * going to need to set up/tear down DCB Priority parameters for the
	 * TX Queues associated with the port.
	 */
	if (new_dcb_enabled != old_dcb_enabled)
		dcb_tx_queue_prio_enable(dev, new_dcb_enabled);
}
#endif /* CONFIG_CHELSIO_T4_DCB */

/* Clear a filter and release any of its resources that we own.  This also
 * clears the filter's "pending" status.
 */
static void clear_filter(struct adapter *adap, struct filter_entry *f)
{
	/* If the new or old filter have loopback rewriteing rules then we'll
	 * need to free any existing Layer Two Table (L2T) entries of the old
	 * filter rule.  The firmware will handle freeing up any Source MAC
	 * Table (SMT) entries used for rewriting Source MAC Addresses in
	 * loopback rules.
	 */
	if (f->l2t)
		cxgb4_l2t_release(f->l2t);

	/* The zeroing of the filter rule below clears the filter valid,
	 * pending, locked flags, l2t pointer, etc. so it's all we need for
	 * this operation.
	 */
	memset(f, 0, sizeof(*f));
}

/* Handle a filter write/deletion reply.
 */
static void filter_rpl(struct adapter *adap, const struct cpl_set_tcb_rpl *rpl)
{
	unsigned int idx = GET_TID(rpl);
	unsigned int nidx = idx - adap->tids.ftid_base;
	unsigned int ret;
	struct filter_entry *f;

	if (idx >= adap->tids.ftid_base && nidx <
	   (adap->tids.nftids + adap->tids.nsftids)) {
		idx = nidx;
		ret = TCB_COOKIE_G(rpl->cookie);
		f = &adap->tids.ftid_tab[idx];

		if (ret == FW_FILTER_WR_FLT_DELETED) {
			/* Clear the filter when we get confirmation from the
			 * hardware that the filter has been deleted.
			 */
			clear_filter(adap, f);
		} else if (ret == FW_FILTER_WR_SMT_TBL_FULL) {
			dev_err(adap->pdev_dev, "filter %u setup failed due to full SMT\n",
				idx);
			clear_filter(adap, f);
		} else if (ret == FW_FILTER_WR_FLT_ADDED) {
			f->smtidx = (be64_to_cpu(rpl->oldval) >> 24) & 0xff;
			f->pending = 0;  /* asynchronous setup completed */
			f->valid = 1;
		} else {
			/* Something went wrong.  Issue a warning about the
			 * problem and clear everything out.
			 */
			dev_err(adap->pdev_dev, "filter %u setup failed with error %u\n",
				idx, ret);
			clear_filter(adap, f);
		}
	}
}

/* Response queue handler for the FW event queue.
 */
static int fwevtq_handler(struct sge_rspq *q, const __be64 *rsp,
			  const struct pkt_gl *gl)
{
	u8 opcode = ((const struct rss_header *)rsp)->opcode;

	rsp++;                                          /* skip RSS header */

	/* FW can send EGR_UPDATEs encapsulated in a CPL_FW4_MSG.
	 */
	if (unlikely(opcode == CPL_FW4_MSG &&
	   ((const struct cpl_fw4_msg *)rsp)->type == FW_TYPE_RSSCPL)) {
		rsp++;
		opcode = ((const struct rss_header *)rsp)->opcode;
		rsp++;
		if (opcode != CPL_SGE_EGR_UPDATE) {
			dev_err(q->adap->pdev_dev, "unexpected FW4/CPL %#x on FW event queue\n"
				, opcode);
			goto out;
		}
	}

	if (likely(opcode == CPL_SGE_EGR_UPDATE)) {
		const struct cpl_sge_egr_update *p = (void *)rsp;
		unsigned int qid = EGR_QID_G(ntohl(p->opcode_qid));
		struct sge_txq *txq;

		txq = q->adap->sge.egr_map[qid - q->adap->sge.egr_start];
		txq->restarts++;
		if ((u8 *)txq < (u8 *)q->adap->sge.ofldtxq) {
			struct sge_eth_txq *eq;

			eq = container_of(txq, struct sge_eth_txq, q);
			netif_tx_wake_queue(eq->txq);
		} else {
			struct sge_ofld_txq *oq;

			oq = container_of(txq, struct sge_ofld_txq, q);
			tasklet_schedule(&oq->qresume_tsk);
		}
	} else if (opcode == CPL_FW6_MSG || opcode == CPL_FW4_MSG) {
		const struct cpl_fw6_msg *p = (void *)rsp;

#ifdef CONFIG_CHELSIO_T4_DCB
		const struct fw_port_cmd *pcmd = (const void *)p->data;
		unsigned int cmd = FW_CMD_OP_G(ntohl(pcmd->op_to_portid));
		unsigned int action =
			FW_PORT_CMD_ACTION_G(ntohl(pcmd->action_to_len16));

		if (cmd == FW_PORT_CMD &&
		    action == FW_PORT_ACTION_GET_PORT_INFO) {
			int port = FW_PORT_CMD_PORTID_G(
					be32_to_cpu(pcmd->op_to_portid));
			struct net_device *dev = q->adap->port[port];
			int state_input = ((pcmd->u.info.dcbxdis_pkd &
					    FW_PORT_CMD_DCBXDIS_F)
					   ? CXGB4_DCB_INPUT_FW_DISABLED
					   : CXGB4_DCB_INPUT_FW_ENABLED);

			cxgb4_dcb_state_fsm(dev, state_input);
		}

		if (cmd == FW_PORT_CMD &&
		    action == FW_PORT_ACTION_L2_DCB_CFG)
			dcb_rpl(q->adap, pcmd);
		else
#endif
			if (p->type == 0)
				t4_handle_fw_rpl(q->adap, p->data);
	} else if (opcode == CPL_L2T_WRITE_RPL) {
		const struct cpl_l2t_write_rpl *p = (void *)rsp;

		do_l2t_write_rpl(q->adap, p);
	} else if (opcode == CPL_SET_TCB_RPL) {
		const struct cpl_set_tcb_rpl *p = (void *)rsp;

		filter_rpl(q->adap, p);
	} else
		dev_err(q->adap->pdev_dev,
			"unexpected CPL %#x on FW event queue\n", opcode);
out:
	return 0;
}

/**
 *	uldrx_handler - response queue handler for ULD queues
 *	@q: the response queue that received the packet
 *	@rsp: the response queue descriptor holding the offload message
 *	@gl: the gather list of packet fragments
 *
 *	Deliver an ingress offload packet to a ULD.  All processing is done by
 *	the ULD, we just maintain statistics.
 */
static int uldrx_handler(struct sge_rspq *q, const __be64 *rsp,
			 const struct pkt_gl *gl)
{
	struct sge_ofld_rxq *rxq = container_of(q, struct sge_ofld_rxq, rspq);

	/* FW can send CPLs encapsulated in a CPL_FW4_MSG.
	 */
	if (((const struct rss_header *)rsp)->opcode == CPL_FW4_MSG &&
	    ((const struct cpl_fw4_msg *)(rsp + 1))->type == FW_TYPE_RSSCPL)
		rsp += 2;

	if (ulds[q->uld].rx_handler(q->adap->uld_handle[q->uld], rsp, gl)) {
		rxq->stats.nomem++;
		return -1;
	}
	if (gl == NULL)
		rxq->stats.imm++;
	else if (gl == CXGB4_MSG_AN)
		rxq->stats.an++;
	else
		rxq->stats.pkts++;
	return 0;
}

static void disable_msi(struct adapter *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;
	}
}

/*
 * Interrupt handler for non-data events used with MSI-X.
 */
static irqreturn_t t4_nondata_intr(int irq, void *cookie)
{
	struct adapter *adap = cookie;
	u32 v = t4_read_reg(adap, MYPF_REG(PL_PF_INT_CAUSE_A));

	if (v & PFSW_F) {
		adap->swintr = 1;
		t4_write_reg(adap, MYPF_REG(PL_PF_INT_CAUSE_A), v);
	}
	if (adap->flags & MASTER_PF)
		t4_slow_intr_handler(adap);
	return IRQ_HANDLED;
}

/*
 * Name the MSI-X interrupts.
 */
static void name_msix_vecs(struct adapter *adap)
{
	int i, j, msi_idx = 2, n = sizeof(adap->msix_info[0].desc);

	/* non-data interrupts */
	snprintf(adap->msix_info[0].desc, n, "%s", adap->port[0]->name);

	/* FW events */
	snprintf(adap->msix_info[1].desc, n, "%s-FWeventq",
		 adap->port[0]->name);

	/* Ethernet queues */
	for_each_port(adap, j) {
		struct net_device *d = adap->port[j];
		const struct port_info *pi = netdev_priv(d);

		for (i = 0; i < pi->nqsets; i++, msi_idx++)
			snprintf(adap->msix_info[msi_idx].desc, n, "%s-Rx%d",
				 d->name, i);
	}

	/* offload queues */
	for_each_iscsirxq(&adap->sge, i)
		snprintf(adap->msix_info[msi_idx++].desc, n, "%s-iscsi%d",
			 adap->port[0]->name, i);

	for_each_rdmarxq(&adap->sge, i)
		snprintf(adap->msix_info[msi_idx++].desc, n, "%s-rdma%d",
			 adap->port[0]->name, i);

	for_each_rdmaciq(&adap->sge, i)
		snprintf(adap->msix_info[msi_idx++].desc, n, "%s-rdma-ciq%d",
			 adap->port[0]->name, i);
}

static int request_msix_queue_irqs(struct adapter *adap)
{
	struct sge *s = &adap->sge;
	int err, ethqidx, iscsiqidx = 0, rdmaqidx = 0, rdmaciqqidx = 0;
	int msi_index = 2;

	err = request_irq(adap->msix_info[1].vec, t4_sge_intr_msix, 0,
			  adap->msix_info[1].desc, &s->fw_evtq);
	if (err)
		return err;

	for_each_ethrxq(s, ethqidx) {
		err = request_irq(adap->msix_info[msi_index].vec,
				  t4_sge_intr_msix, 0,
				  adap->msix_info[msi_index].desc,
				  &s->ethrxq[ethqidx].rspq);
		if (err)
			goto unwind;
		msi_index++;
	}
	for_each_iscsirxq(s, iscsiqidx) {
		err = request_irq(adap->msix_info[msi_index].vec,
				  t4_sge_intr_msix, 0,
				  adap->msix_info[msi_index].desc,
				  &s->iscsirxq[iscsiqidx].rspq);
		if (err)
			goto unwind;
		msi_index++;
	}
	for_each_rdmarxq(s, rdmaqidx) {
		err = request_irq(adap->msix_info[msi_index].vec,
				  t4_sge_intr_msix, 0,
				  adap->msix_info[msi_index].desc,
				  &s->rdmarxq[rdmaqidx].rspq);
		if (err)
			goto unwind;
		msi_index++;
	}
	for_each_rdmaciq(s, rdmaciqqidx) {
		err = request_irq(adap->msix_info[msi_index].vec,
				  t4_sge_intr_msix, 0,
				  adap->msix_info[msi_index].desc,
				  &s->rdmaciq[rdmaciqqidx].rspq);
		if (err)
			goto unwind;
		msi_index++;
	}
	return 0;

unwind:
	while (--rdmaciqqidx >= 0)
		free_irq(adap->msix_info[--msi_index].vec,
			 &s->rdmaciq[rdmaciqqidx].rspq);
	while (--rdmaqidx >= 0)
		free_irq(adap->msix_info[--msi_index].vec,
			 &s->rdmarxq[rdmaqidx].rspq);
	while (--iscsiqidx >= 0)
		free_irq(adap->msix_info[--msi_index].vec,
			 &s->iscsirxq[iscsiqidx].rspq);
	while (--ethqidx >= 0)
		free_irq(adap->msix_info[--msi_index].vec,
			 &s->ethrxq[ethqidx].rspq);
	free_irq(adap->msix_info[1].vec, &s->fw_evtq);
	return err;
}

static void free_msix_queue_irqs(struct adapter *adap)
{
	int i, msi_index = 2;
	struct sge *s = &adap->sge;

	free_irq(adap->msix_info[1].vec, &s->fw_evtq);
	for_each_ethrxq(s, i)
		free_irq(adap->msix_info[msi_index++].vec, &s->ethrxq[i].rspq);
	for_each_iscsirxq(s, i)
		free_irq(adap->msix_info[msi_index++].vec,
			 &s->iscsirxq[i].rspq);
	for_each_rdmarxq(s, i)
		free_irq(adap->msix_info[msi_index++].vec, &s->rdmarxq[i].rspq);
	for_each_rdmaciq(s, i)
		free_irq(adap->msix_info[msi_index++].vec, &s->rdmaciq[i].rspq);
}

/**
 *	cxgb4_write_rss - write the RSS table for a given port
 *	@pi: the port
 *	@queues: array of queue indices for RSS
 *
 *	Sets up the portion of the HW RSS table for the port's VI to distribute
 *	packets to the Rx queues in @queues.
 *	Should never be called before setting up sge eth rx queues
 */
int cxgb4_write_rss(const struct port_info *pi, const u16 *queues)
{
	u16 *rss;
	int i, err;
	struct adapter *adapter = pi->adapter;
	const struct sge_eth_rxq *rxq;

	rxq = &adapter->sge.ethrxq[pi->first_qset];
	rss = kmalloc(pi->rss_size * sizeof(u16), GFP_KERNEL);
	if (!rss)
		return -ENOMEM;

	/* map the queue indices to queue ids */
	for (i = 0; i < pi->rss_size; i++, queues++)
		rss[i] = rxq[*queues].rspq.abs_id;

	err = t4_config_rss_range(adapter, adapter->pf, pi->viid, 0,
				  pi->rss_size, rss, pi->rss_size);
	/* 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 (!err)
		err = t4_config_vi_rss(adapter, adapter->mbox, pi->viid,
				       FW_RSS_VI_CONFIG_CMD_IP6FOURTUPEN_F |
				       FW_RSS_VI_CONFIG_CMD_IP6TWOTUPEN_F |
				       FW_RSS_VI_CONFIG_CMD_IP4FOURTUPEN_F |
				       FW_RSS_VI_CONFIG_CMD_IP4TWOTUPEN_F |
				       FW_RSS_VI_CONFIG_CMD_UDPEN_F,
				       rss[0]);
	kfree(rss);
	return err;
}

/**
 *	setup_rss - configure RSS
 *	@adap: the adapter
 *
 *	Sets up RSS for each port.
 */
static int setup_rss(struct adapter *adap)
{
	int i, j, err;

	for_each_port(adap, i) {
		const struct port_info *pi = adap2pinfo(adap, i);

		/* Fill default values with equal distribution */
		for (j = 0; j < pi->rss_size; j++)
			pi->rss[j] = j % pi->nqsets;

		err = cxgb4_write_rss(pi, pi->rss);
		if (err)
			return err;
	}
	return 0;
}

/*
 * Return the channel of the ingress queue with the given qid.
 */
static unsigned int rxq_to_chan(const struct sge *p, unsigned int qid)
{
	qid -= p->ingr_start;
	return netdev2pinfo(p->ingr_map[qid]->netdev)->tx_chan;
}

/*
 * Wait until all NAPI handlers are descheduled.
 */
static void quiesce_rx(struct adapter *adap)
{
	int i;

	for (i = 0; i < adap->sge.ingr_sz; i++) {
		struct sge_rspq *q = adap->sge.ingr_map[i];

		if (q && q->handler) {
			napi_disable(&q->napi);
			local_bh_disable();
			while (!cxgb_poll_lock_napi(q))
				mdelay(1);
			local_bh_enable();
		}

	}
}

/* Disable interrupt and napi handler */
static void disable_interrupts(struct adapter *adap)
{
	if (adap->flags & FULL_INIT_DONE) {
		t4_intr_disable(adap);
		if (adap->flags & USING_MSIX) {
			free_msix_queue_irqs(adap);
			free_irq(adap->msix_info[0].vec, adap);
		} else {
			free_irq(adap->pdev->irq, adap);
		}
		quiesce_rx(adap);
	}
}

/*
 * Enable NAPI scheduling and interrupt generation for all Rx queues.
 */
static void enable_rx(struct adapter *adap)
{
	int i;

	for (i = 0; i < adap->sge.ingr_sz; i++) {
		struct sge_rspq *q = adap->sge.ingr_map[i];

		if (!q)
			continue;
		if (q->handler) {
			cxgb_busy_poll_init_lock(q);
			napi_enable(&q->napi);
		}
		/* 0-increment GTS to start the timer and enable interrupts */
		t4_write_reg(adap, MYPF_REG(SGE_PF_GTS_A),
			     SEINTARM_V(q->intr_params) |
			     INGRESSQID_V(q->cntxt_id));
	}
}

static int alloc_ofld_rxqs(struct adapter *adap, struct sge_ofld_rxq *q,
			   unsigned int nq, unsigned int per_chan, int msi_idx,
			   u16 *ids)
{
	int i, err;

	for (i = 0; i < nq; i++, q++) {
		if (msi_idx > 0)
			msi_idx++;
		err = t4_sge_alloc_rxq(adap, &q->rspq, false,
				       adap->port[i / per_chan],
				       msi_idx, q->fl.size ? &q->fl : NULL,
				       uldrx_handler, 0);
		if (err)
			return err;
		memset(&q->stats, 0, sizeof(q->stats));
		if (ids)
			ids[i] = q->rspq.abs_id;
	}
	return 0;
}

/**
 *	setup_sge_queues - configure SGE Tx/Rx/response queues
 *	@adap: the adapter
 *
 *	Determines 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 *adap)
{
	int err, msi_idx, i, j;
	struct sge *s = &adap->sge;

	bitmap_zero(s->starving_fl, s->egr_sz);
	bitmap_zero(s->txq_maperr, s->egr_sz);

	if (adap->flags & USING_MSIX)
		msi_idx = 1;         /* vector 0 is for non-queue interrupts */
	else {
		err = t4_sge_alloc_rxq(adap, &s->intrq, false, adap->port[0], 0,
				       NULL, NULL, -1);
		if (err)
			return err;
		msi_idx = -((int)s->intrq.abs_id + 1);
	}

	/* NOTE: If you add/delete any Ingress/Egress Queue allocations in here,
	 * don't forget to update the following which need to be
	 * synchronized to and changes here.
	 *
	 * 1. The calculations of MAX_INGQ in cxgb4.h.
	 *
	 * 2. Update enable_msix/name_msix_vecs/request_msix_queue_irqs
	 *    to accommodate any new/deleted Ingress Queues
	 *    which need MSI-X Vectors.
	 *
	 * 3. Update sge_qinfo_show() to include information on the
	 *    new/deleted queues.
	 */
	err = t4_sge_alloc_rxq(adap, &s->fw_evtq, true, adap->port[0],
			       msi_idx, NULL, fwevtq_handler, -1);
	if (err) {
freeout:	t4_free_sge_resources(adap);
		return err;
	}

	for_each_port(adap, i) {
		struct net_device *dev = adap->port[i];
		struct port_info *pi = netdev_priv(dev);
		struct sge_eth_rxq *q = &s->ethrxq[pi->first_qset];
		struct sge_eth_txq *t = &s->ethtxq[pi->first_qset];

		for (j = 0; j < pi->nqsets; j++, q++) {
			if (msi_idx > 0)
				msi_idx++;
			err = t4_sge_alloc_rxq(adap, &q->rspq, false, dev,
					       msi_idx, &q->fl,
					       t4_ethrx_handler,
					       t4_get_mps_bg_map(adap,
								 pi->tx_chan));
			if (err)
				goto freeout;
			q->rspq.idx = j;
			memset(&q->stats, 0, sizeof(q->stats));
		}
		for (j = 0; j < pi->nqsets; j++, t++) {
			err = t4_sge_alloc_eth_txq(adap, t, dev,
					netdev_get_tx_queue(dev, j),
					s->fw_evtq.cntxt_id);
			if (err)
				goto freeout;
		}
	}

	j = s->iscsiqsets / adap->params.nports; /* iscsi queues per channel */
	for_each_iscsirxq(s, i) {
		err = t4_sge_alloc_ofld_txq(adap, &s->ofldtxq[i],
					    adap->port[i / j],
					    s->fw_evtq.cntxt_id);
		if (err)
			goto freeout;
	}

#define ALLOC_OFLD_RXQS(firstq, nq, per_chan, ids) do { \
	err = alloc_ofld_rxqs(adap, firstq, nq, per_chan, msi_idx, ids); \
	if (err) \
		goto freeout; \
	if (msi_idx > 0) \
		msi_idx += nq; \
} while (0)

	ALLOC_OFLD_RXQS(s->iscsirxq, s->iscsiqsets, j, s->iscsi_rxq);
	ALLOC_OFLD_RXQS(s->rdmarxq, s->rdmaqs, 1, s->rdma_rxq);
	j = s->rdmaciqs / adap->params.nports; /* rdmaq queues per channel */
	ALLOC_OFLD_RXQS(s->rdmaciq, s->rdmaciqs, j, s->rdma_ciq);

#undef ALLOC_OFLD_RXQS

	for_each_port(adap, i) {
		/*
		 * Note that ->rdmarxq[i].rspq.cntxt_id below is 0 if we don't
		 * have RDMA queues, and that's the right value.
		 */
		err = t4_sge_alloc_ctrl_txq(adap, &s->ctrlq[i], adap->port[i],
					    s->fw_evtq.cntxt_id,
					    s->rdmarxq[i].rspq.cntxt_id);
		if (err)
			goto freeout;
	}

	t4_write_reg(adap, is_t4(adap->params.chip) ?
				MPS_TRC_RSS_CONTROL_A :
				MPS_T5_TRC_RSS_CONTROL_A,
		     RSSCONTROL_V(netdev2pinfo(adap->port[0])->tx_chan) |
		     QUEUENUMBER_V(s->ethrxq[0].rspq.abs_id));
	return 0;
}

/*
 * Allocate a chunk of memory using kmalloc or, if that fails, vmalloc.
 * The allocated memory is cleared.
 */
void *t4_alloc_mem(size_t size)
{
	void *p = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);

	if (!p)
		p = vzalloc(size);
	return p;
}

/*
 * Free memory allocated through alloc_mem().
 */
void t4_free_mem(void *addr)
{
	kvfree(addr);
}

/* Send a Work Request to write the filter at a specified index.  We construct
 * a Firmware Filter Work Request to have the work done and put the indicated
 * filter into "pending" mode which will prevent any further actions against
 * it till we get a reply from the firmware on the completion status of the
 * request.
 */
static int set_filter_wr(struct adapter *adapter, int fidx)
{
	struct filter_entry *f = &adapter->tids.ftid_tab[fidx];
	struct sk_buff *skb;
	struct fw_filter_wr *fwr;
	unsigned int ftid;

	skb = alloc_skb(sizeof(*fwr), GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	/* If the new filter requires loopback Destination MAC and/or VLAN
	 * rewriting then we need to allocate a Layer 2 Table (L2T) entry for
	 * the filter.
	 */
	if (f->fs.newdmac || f->fs.newvlan) {
		/* allocate L2T entry for new filter */
		f->l2t = t4_l2t_alloc_switching(adapter, f->fs.vlan,
						f->fs.eport, f->fs.dmac);
		if (f->l2t == NULL) {
			kfree_skb(skb);
			return -ENOMEM;
		}
	}

	ftid = adapter->tids.ftid_base + fidx;

	fwr = (struct fw_filter_wr *)__skb_put(skb, sizeof(*fwr));
	memset(fwr, 0, sizeof(*fwr));

	/* It would be nice to put most of the following in t4_hw.c but most
	 * of the work is translating the cxgbtool ch_filter_specification
	 * into the Work Request and the definition of that structure is
	 * currently in cxgbtool.h which isn't appropriate to pull into the
	 * common code.  We may eventually try to come up with a more neutral
	 * filter specification structure but for now it's easiest to simply
	 * put this fairly direct code in line ...
	 */
	fwr->op_pkd = htonl(FW_WR_OP_V(FW_FILTER_WR));
	fwr->len16_pkd = htonl(FW_WR_LEN16_V(sizeof(*fwr)/16));
	fwr->tid_to_iq =
		htonl(FW_FILTER_WR_TID_V(ftid) |
		      FW_FILTER_WR_RQTYPE_V(f->fs.type) |
		      FW_FILTER_WR_NOREPLY_V(0) |
		      FW_FILTER_WR_IQ_V(f->fs.iq));
	fwr->del_filter_to_l2tix =
		htonl(FW_FILTER_WR_RPTTID_V(f->fs.rpttid) |
		      FW_FILTER_WR_DROP_V(f->fs.action == FILTER_DROP) |
		      FW_FILTER_WR_DIRSTEER_V(f->fs.dirsteer) |
		      FW_FILTER_WR_MASKHASH_V(f->fs.maskhash) |
		      FW_FILTER_WR_DIRSTEERHASH_V(f->fs.dirsteerhash) |
		      FW_FILTER_WR_LPBK_V(f->fs.action == FILTER_SWITCH) |
		      FW_FILTER_WR_DMAC_V(f->fs.newdmac) |
		      FW_FILTER_WR_SMAC_V(f->fs.newsmac) |
		      FW_FILTER_WR_INSVLAN_V(f->fs.newvlan == VLAN_INSERT ||
					     f->fs.newvlan == VLAN_REWRITE) |
		      FW_FILTER_WR_RMVLAN_V(f->fs.newvlan == VLAN_REMOVE ||
					    f->fs.newvlan == VLAN_REWRITE) |
		      FW_FILTER_WR_HITCNTS_V(f->fs.hitcnts) |
		      FW_FILTER_WR_TXCHAN_V(f->fs.eport) |
		      FW_FILTER_WR_PRIO_V(f->fs.prio) |
		      FW_FILTER_WR_L2TIX_V(f->l2t ? f->l2t->idx : 0));
	fwr->ethtype = htons(f->fs.val.ethtype);
	fwr->ethtypem = htons(f->fs.mask.ethtype);
	fwr->frag_to_ovlan_vldm =
		(FW_FILTER_WR_FRAG_V(f->fs.val.frag) |
		 FW_FILTER_WR_FRAGM_V(f->fs.mask.frag) |
		 FW_FILTER_WR_IVLAN_VLD_V(f->fs.val.ivlan_vld) |
		 FW_FILTER_WR_OVLAN_VLD_V(f->fs.val.ovlan_vld) |
		 FW_FILTER_WR_IVLAN_VLDM_V(f->fs.mask.ivlan_vld) |
		 FW_FILTER_WR_OVLAN_VLDM_V(f->fs.mask.ovlan_vld));
	fwr->smac_sel = 0;
	fwr->rx_chan_rx_rpl_iq =
		htons(FW_FILTER_WR_RX_CHAN_V(0) |
		      FW_FILTER_WR_RX_RPL_IQ_V(adapter->sge.fw_evtq.abs_id));
	fwr->maci_to_matchtypem =
		htonl(FW_FILTER_WR_MACI_V(f->fs.val.macidx) |
		      FW_FILTER_WR_MACIM_V(f->fs.mask.macidx) |
		      FW_FILTER_WR_FCOE_V(f->fs.val.fcoe) |
		      FW_FILTER_WR_FCOEM_V(f->fs.mask.fcoe) |
		      FW_FILTER_WR_PORT_V(f->fs.val.iport) |
		      FW_FILTER_WR_PORTM_V(f->fs.mask.iport) |
		      FW_FILTER_WR_MATCHTYPE_V(f->fs.val.matchtype) |
		      FW_FILTER_WR_MATCHTYPEM_V(f->fs.mask.matchtype));
	fwr->ptcl = f->fs.val.proto;
	fwr->ptclm = f->fs.mask.proto;
	fwr->ttyp = f->fs.val.tos;
	fwr->ttypm = f->fs.mask.tos;
	fwr->ivlan = htons(f->fs.val.ivlan);
	fwr->ivlanm = htons(f->fs.mask.ivlan);
	fwr->ovlan = htons(f->fs.val.ovlan);
	fwr->ovlanm = htons(f->fs.mask.ovlan);
	memcpy(fwr->lip, f->fs.val.lip, sizeof(fwr->lip));
	memcpy(fwr->lipm, f->fs.mask.lip, sizeof(fwr->lipm));
	memcpy(fwr->fip, f->fs.val.fip, sizeof(fwr->fip));
	memcpy(fwr->fipm, f->fs.mask.fip, sizeof(fwr->fipm));
	fwr->lp = htons(f->fs.val.lport);
	fwr->lpm = htons(f->fs.mask.lport);
	fwr->fp = htons(f->fs.val.fport);
	fwr->fpm = htons(f->fs.mask.fport);
	if (f->fs.newsmac)
		memcpy(fwr->sma, f->fs.smac, sizeof(fwr->sma));

	/* Mark the filter as "pending" and ship off the Filter Work Request.
	 * When we get the Work Request Reply we'll clear the pending status.
	 */
	f->pending = 1;
	set_wr_txq(skb, CPL_PRIORITY_CONTROL, f->fs.val.iport & 0x3);
	t4_ofld_send(adapter, skb);
	return 0;
}

/* Delete the filter at a specified index.
 */
static int del_filter_wr(struct adapter *adapter, int fidx)
{
	struct filter_entry *f = &adapter->tids.ftid_tab[fidx];
	struct sk_buff *skb;
	struct fw_filter_wr *fwr;
	unsigned int len, ftid;

	len = sizeof(*fwr);
	ftid = adapter->tids.ftid_base + fidx;

	skb = alloc_skb(len, GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	fwr = (struct fw_filter_wr *)__skb_put(skb, len);
	t4_mk_filtdelwr(ftid, fwr, adapter->sge.fw_evtq.abs_id);

	/* Mark the filter as "pending" and ship off the Filter Work Request.
	 * When we get the Work Request Reply we'll clear the pending status.
	 */
	f->pending = 1;
	t4_mgmt_tx(adapter, skb);
	return 0;
}

static u16 cxgb_select_queue(struct net_device *dev, struct sk_buff *skb,
			     void *accel_priv, select_queue_fallback_t fallback)
{
	int txq;

#ifdef CONFIG_CHELSIO_T4_DCB
	/* If a Data Center Bridging has been successfully negotiated on this
	 * link then we'll use the skb's priority to map it to a TX Queue.
	 * The skb's priority is determined via the VLAN Tag Priority Code
	 * Point field.
	 */
	if (cxgb4_dcb_enabled(dev)) {
		u16 vlan_tci;
		int err;

		err = vlan_get_tag(skb, &vlan_tci);
		if (unlikely(err)) {
			if (net_ratelimit())
				netdev_warn(dev,
					    "TX Packet without VLAN Tag on DCB Link\n");
			txq = 0;
		} else {
			txq = (vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
#ifdef CONFIG_CHELSIO_T4_FCOE
			if (skb->protocol == htons(ETH_P_FCOE))
				txq = skb->priority & 0x7;
#endif /* CONFIG_CHELSIO_T4_FCOE */
		}
		return txq;
	}
#endif /* CONFIG_CHELSIO_T4_DCB */

	if (select_queue) {
		txq = (skb_rx_queue_recorded(skb)
			? skb_get_rx_queue(skb)
			: smp_processor_id());

		while (unlikely(txq >= dev->real_num_tx_queues))
			txq -= dev->real_num_tx_queues;

		return txq;
	}

	return fallback(dev, skb) % dev->real_num_tx_queues;
}

static int closest_timer(const struct sge *s, int time)
{
	int i, delta, match = 0, min_delta = INT_MAX;

	for (i = 0; i < ARRAY_SIZE(s->timer_val); i++) {
		delta = time - s->timer_val[i];
		if (delta < 0)
			delta = -delta;
		if (delta < min_delta) {
			min_delta = delta;
			match = i;
		}
	}
	return match;
}

static int closest_thres(const struct sge *s, int thres)
{
	int i, delta, match = 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;
			match = i;
		}
	}
	return match;
}

/**
 *	cxgb4_set_rspq_intr_params - set a queue's interrupt holdoff parameters
 *	@q: the Rx 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 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.
 */
int cxgb4_set_rspq_intr_params(struct sge_rspq *q,
			       unsigned int us, unsigned int cnt)
{
	struct adapter *adap = q->adap;

	if ((us | cnt) == 0)
		cnt = 1;

	if (cnt) {
		int err;
		u32 v, new_idx;

		new_idx = closest_thres(&adap->sge, cnt);
		if (q->desc && q->pktcnt_idx != new_idx) {
			/* the queue has already been created, update it */
			v = FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DMAQ) |
			    FW_PARAMS_PARAM_X_V(
					FW_PARAMS_PARAM_DMAQ_IQ_INTCNTTHRESH) |
			    FW_PARAMS_PARAM_YZ_V(q->cntxt_id);
			err = t4_set_params(adap, adap->mbox, adap->pf, 0, 1,
					    &v, &new_idx);
			if (err)
				return err;
		}
		q->pktcnt_idx = new_idx;
	}

	us = us == 0 ? 6 : closest_timer(&adap->sge, us);
	q->intr_params = QINTR_TIMER_IDX_V(us) | QINTR_CNT_EN_V(cnt > 0);
	return 0;
}

static int cxgb_set_features(struct net_device *dev, netdev_features_t features)
{
	const struct port_info *pi = netdev_priv(dev);
	netdev_features_t changed = dev->features ^ features;
	int err;

	if (!(changed & NETIF_F_HW_VLAN_CTAG_RX))
		return 0;

	err = t4_set_rxmode(pi->adapter, pi->adapter->pf, pi->viid, -1,
			    -1, -1, -1,
			    !!(features & NETIF_F_HW_VLAN_CTAG_RX), true);
	if (unlikely(err))
		dev->features = features ^ NETIF_F_HW_VLAN_CTAG_RX;
	return err;
}

static int setup_debugfs(struct adapter *adap)
{
	if (IS_ERR_OR_NULL(adap->debugfs_root))
		return -1;

#ifdef CONFIG_DEBUG_FS
	t4_setup_debugfs(adap);
#endif
	return 0;
}

/*
 * upper-layer driver support
 */

/*
 * Allocate an active-open TID and set it to the supplied value.
 */
int cxgb4_alloc_atid(struct tid_info *t, void *data)
{
	int atid = -1;

	spin_lock_bh(&t->atid_lock);
	if (t->afree) {
		union aopen_entry *p = t->afree;

		atid = (p - t->atid_tab) + t->atid_base;
		t->afree = p->next;
		p->data = data;
		t->atids_in_use++;
	}
	spin_unlock_bh(&t->atid_lock);
	return atid;
}
EXPORT_SYMBOL(cxgb4_alloc_atid);

/*
 * Release an active-open TID.
 */
void cxgb4_free_atid(struct tid_info *t, unsigned int atid)
{
	union aopen_entry *p = &t->atid_tab[atid - t->atid_base];

	spin_lock_bh(&t->atid_lock);
	p->next = t->afree;
	t->afree = p;
	t->atids_in_use--;
	spin_unlock_bh(&t->atid_lock);
}
EXPORT_SYMBOL(cxgb4_free_atid);

/*
 * Allocate a server TID and set it to the supplied value.
 */
int cxgb4_alloc_stid(struct tid_info *t, int family, void *data)
{
	int stid;

	spin_lock_bh(&t->stid_lock);
	if (family == PF_INET) {
		stid = find_first_zero_bit(t->stid_bmap, t->nstids);
		if (stid < t->nstids)
			__set_bit(stid, t->stid_bmap);
		else
			stid = -1;
	} else {
		stid = bitmap_find_free_region(t->stid_bmap, t->nstids, 1);
		if (stid < 0)
			stid = -1;
	}
	if (stid >= 0) {
		t->stid_tab[stid].data = data;
		stid += t->stid_base;
		/* IPv6 requires max of 520 bits or 16 cells in TCAM
		 * This is equivalent to 4 TIDs. With CLIP enabled it
		 * needs 2 TIDs.
		 */
		if (family == PF_INET)
			t->stids_in_use++;
		else
			t->stids_in_use += 2;
	}
	spin_unlock_bh(&t->stid_lock);
	return stid;
}
EXPORT_SYMBOL(cxgb4_alloc_stid);

/* Allocate a server filter TID and set it to the supplied value.
 */
int cxgb4_alloc_sftid(struct tid_info *t, int family, void *data)
{
	int stid;

	spin_lock_bh(&t->stid_lock);
	if (family == PF_INET) {
		stid = find_next_zero_bit(t->stid_bmap,
				t->nstids + t->nsftids, t->nstids);
		if (stid < (t->nstids + t->nsftids))
			__set_bit(stid, t->stid_bmap);
		else
			stid = -1;
	} else {
		stid = -1;
	}
	if (stid >= 0) {
		t->stid_tab[stid].data = data;
		stid -= t->nstids;
		stid += t->sftid_base;
		t->sftids_in_use++;
	}
	spin_unlock_bh(&t->stid_lock);
	return stid;
}
EXPORT_SYMBOL(cxgb4_alloc_sftid);

/* Release a server TID.
 */
void cxgb4_free_stid(struct tid_info *t, unsigned int stid, int family)
{
	/* Is it a server filter TID? */
	if (t->nsftids && (stid >= t->sftid_base)) {
		stid -= t->sftid_base;
		stid += t->nstids;
	} else {
		stid -= t->stid_base;
	}

	spin_lock_bh(&t->stid_lock);
	if (family == PF_INET)
		__clear_bit(stid, t->stid_bmap);
	else
		bitmap_release_region(t->stid_bmap, stid, 1);
	t->stid_tab[stid].data = NULL;
	if (stid < t->nstids) {
		if (family == PF_INET)
			t->stids_in_use--;
		else
			t->stids_in_use -= 2;
	} else {
		t->sftids_in_use--;
	}
	spin_unlock_bh(&t->stid_lock);
}
EXPORT_SYMBOL(cxgb4_free_stid);

/*
 * Populate a TID_RELEASE WR.  Caller must properly size the skb.
 */
static void mk_tid_release(struct sk_buff *skb, unsigned int chan,
			   unsigned int tid)
{
	struct cpl_tid_release *req;

	set_wr_txq(skb, CPL_PRIORITY_SETUP, chan);
	req = (struct cpl_tid_release *)__skb_put(skb, sizeof(*req));
	INIT_TP_WR(req, tid);
	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_TID_RELEASE, tid));
}

/*
 * Queue a TID release request and if necessary schedule a work queue to
 * process it.
 */
static void cxgb4_queue_tid_release(struct tid_info *t, unsigned int chan,
				    unsigned int tid)
{
	void **p = &t->tid_tab[tid];
	struct adapter *adap = container_of(t, struct adapter, tids);

	spin_lock_bh(&adap->tid_release_lock);
	*p = adap->tid_release_head;
	/* Low 2 bits encode the Tx channel number */
	adap->tid_release_head = (void **)((uintptr_t)p | chan);
	if (!adap->tid_release_task_busy) {
		adap->tid_release_task_busy = true;
		queue_work(adap->workq, &adap->tid_release_task);
	}
	spin_unlock_bh(&adap->tid_release_lock);
}

/*
 * Process the list of pending TID release requests.
 */
static void process_tid_release_list(struct work_struct *work)
{
	struct sk_buff *skb;
	struct adapter *adap;

	adap = container_of(work, struct adapter, tid_release_task);

	spin_lock_bh(&adap->tid_release_lock);
	while (adap->tid_release_head) {
		void **p = adap->tid_release_head;
		unsigned int chan = (uintptr_t)p & 3;
		p = (void *)p - chan;

		adap->tid_release_head = *p;
		*p = NULL;
		spin_unlock_bh(&adap->tid_release_lock);

		while (!(skb = alloc_skb(sizeof(struct cpl_tid_release),
					 GFP_KERNEL)))
			schedule_timeout_uninterruptible(1);

		mk_tid_release(skb, chan, p - adap->tids.tid_tab);
		t4_ofld_send(adap, skb);
		spin_lock_bh(&adap->tid_release_lock);
	}
	adap->tid_release_task_busy = false;
	spin_unlock_bh(&adap->tid_release_lock);
}

/*
 * Release a TID and inform HW.  If we are unable to allocate the release
 * message we defer to a work queue.
 */
void cxgb4_remove_tid(struct tid_info *t, unsigned int chan, unsigned int tid)
{
	struct sk_buff *skb;
	struct adapter *adap = container_of(t, struct adapter, tids);

	WARN_ON(tid >= t->ntids);

	if (t->tid_tab[tid]) {
		t->tid_tab[tid] = NULL;
		if (t->hash_base && (tid >= t->hash_base))
			atomic_dec(&t->hash_tids_in_use);
		else
			atomic_dec(&t->tids_in_use);
	}

	skb = alloc_skb(sizeof(struct cpl_tid_release), GFP_ATOMIC);
	if (likely(skb)) {
		mk_tid_release(skb, chan, tid);
		t4_ofld_send(adap, skb);
	} else
		cxgb4_queue_tid_release(t, chan, tid);
}
EXPORT_SYMBOL(cxgb4_remove_tid);

/*
 * Allocate and initialize the TID tables.  Returns 0 on success.
 */
static int tid_init(struct tid_info *t)
{
	size_t size;
	unsigned int stid_bmap_size;
	unsigned int natids = t->natids;
	struct adapter *adap = container_of(t, struct adapter, tids);

	stid_bmap_size = BITS_TO_LONGS(t->nstids + t->nsftids);
	size = t->ntids * sizeof(*t->tid_tab) +
	       natids * sizeof(*t->atid_tab) +
	       t->nstids * sizeof(*t->stid_tab) +
	       t->nsftids * sizeof(*t->stid_tab) +
	       stid_bmap_size * sizeof(long) +
	       t->nftids * sizeof(*t->ftid_tab) +
	       t->nsftids * sizeof(*t->ftid_tab);

	t->tid_tab = t4_alloc_mem(size);
	if (!t->tid_tab)
		return -ENOMEM;

	t->atid_tab = (union aopen_entry *)&t->tid_tab[t->ntids];
	t->stid_tab = (struct serv_entry *)&t->atid_tab[natids];
	t->stid_bmap = (unsigned long *)&t->stid_tab[t->nstids + t->nsftids];
	t->ftid_tab = (struct filter_entry *)&t->stid_bmap[stid_bmap_size];
	spin_lock_init(&t->stid_lock);
	spin_lock_init(&t->atid_lock);

	t->stids_in_use = 0;
	t->sftids_in_use = 0;
	t->afree = NULL;
	t->atids_in_use = 0;
	atomic_set(&t->tids_in_use, 0);
	atomic_set(&t->hash_tids_in_use, 0);

	/* Setup the free list for atid_tab and clear the stid bitmap. */
	if (natids) {
		while (--natids)
			t->atid_tab[natids - 1].next = &t->atid_tab[natids];
		t->afree = t->atid_tab;
	}
	bitmap_zero(t->stid_bmap, t->nstids + t->nsftids);
	/* Reserve stid 0 for T4/T5 adapters */
	if (!t->stid_base &&
	    (CHELSIO_CHIP_VERSION(adap->params.chip) <= CHELSIO_T5))
		__set_bit(0, t->stid_bmap);

	return 0;
}

/**
 *	cxgb4_create_server - create an IP server
 *	@dev: the device
 *	@stid: the server TID
 *	@sip: local IP address to bind server to
 *	@sport: the server's TCP port
 *	@queue: queue to direct messages from this server to
 *
 *	Create an IP server for the given port and address.
 *	Returns <0 on error and one of the %NET_XMIT_* values on success.
 */
int cxgb4_create_server(const struct net_device *dev, unsigned int stid,
			__be32 sip, __be16 sport, __be16 vlan,
			unsigned int queue)
{
	unsigned int chan;
	struct sk_buff *skb;
	struct adapter *adap;
	struct cpl_pass_open_req *req;
	int ret;

	skb = alloc_skb(sizeof(*req), GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	adap = netdev2adap(dev);
	req = (struct cpl_pass_open_req *)__skb_put(skb, sizeof(*req));
	INIT_TP_WR(req, 0);
	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_PASS_OPEN_REQ, stid));
	req->local_port = sport;
	req->peer_port = htons(0);
	req->local_ip = sip;
	req->peer_ip = htonl(0);
	chan = rxq_to_chan(&adap->sge, queue);
	req->opt0 = cpu_to_be64(TX_CHAN_V(chan));
	req->opt1 = cpu_to_be64(CONN_POLICY_V(CPL_CONN_POLICY_ASK) |
				SYN_RSS_ENABLE_F | SYN_RSS_QUEUE_V(queue));
	ret = t4_mgmt_tx(adap, skb);
	return net_xmit_eval(ret);
}
EXPORT_SYMBOL(cxgb4_create_server);

/*	cxgb4_create_server6 - create an IPv6 server
 *	@dev: the device
 *	@stid: the server TID
 *	@sip: local IPv6 address to bind server to
 *	@sport: the server's TCP port
 *	@queue: queue to direct messages from this server to
 *
 *	Create an IPv6 server for the given port and address.
 *	Returns <0 on error and one of the %NET_XMIT_* values on success.
 */
int cxgb4_create_server6(const struct net_device *dev, unsigned int stid,
			 const struct in6_addr *sip, __be16 sport,
			 unsigned int queue)
{
	unsigned int chan;
	struct sk_buff *skb;
	struct adapter *adap;
	struct cpl_pass_open_req6 *req;
	int ret;

	skb = alloc_skb(sizeof(*req), GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	adap = netdev2adap(dev);
	req = (struct cpl_pass_open_req6 *)__skb_put(skb, sizeof(*req));
	INIT_TP_WR(req, 0);
	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_PASS_OPEN_REQ6, stid));
	req->local_port = sport;
	req->peer_port = htons(0);
	req->local_ip_hi = *(__be64 *)(sip->s6_addr);
	req->local_ip_lo = *(__be64 *)(sip->s6_addr + 8);
	req->peer_ip_hi = cpu_to_be64(0);
	req->peer_ip_lo = cpu_to_be64(0);
	chan = rxq_to_chan(&adap->sge, queue);
	req->opt0 = cpu_to_be64(TX_CHAN_V(chan));
	req->opt1 = cpu_to_be64(CONN_POLICY_V(CPL_CONN_POLICY_ASK) |
				SYN_RSS_ENABLE_F | SYN_RSS_QUEUE_V(queue));
	ret = t4_mgmt_tx(adap, skb);
	return net_xmit_eval(ret);
}
EXPORT_SYMBOL(cxgb4_create_server6);

int cxgb4_remove_server(const struct net_device *dev, unsigned int stid,
			unsigned int queue, bool ipv6)
{
	struct sk_buff *skb;
	struct adapter *adap;
	struct cpl_close_listsvr_req *req;
	int ret;

	adap = netdev2adap(dev);

	skb = alloc_skb(sizeof(*req), GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	req = (struct cpl_close_listsvr_req *)__skb_put(skb, sizeof(*req));
	INIT_TP_WR(req, 0);
	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_LISTSRV_REQ, stid));
	req->reply_ctrl = htons(NO_REPLY_V(0) | (ipv6 ? LISTSVR_IPV6_V(1) :
				LISTSVR_IPV6_V(0)) | QUEUENO_V(queue));
	ret = t4_mgmt_tx(adap, skb);
	return net_xmit_eval(ret);
}
EXPORT_SYMBOL(cxgb4_remove_server);

/**
 *	cxgb4_best_mtu - find the entry in the MTU table closest to an MTU
 *	@mtus: the HW MTU table
 *	@mtu: the target MTU
 *	@idx: index of selected entry in the MTU table
 *
 *	Returns the index and the value in the HW MTU table that is closest to
 *	but does not exceed @mtu, unless @mtu is smaller than any value in the
 *	table, in which case that smallest available value is selected.
 */
unsigned int cxgb4_best_mtu(const unsigned short *mtus, unsigned short mtu,
			    unsigned int *idx)
{
	unsigned int i = 0;

	while (i < NMTUS - 1 && mtus[i + 1] <= mtu)
		++i;
	if (idx)
		*idx = i;
	return mtus[i];
}
EXPORT_SYMBOL(cxgb4_best_mtu);

/**
 *     cxgb4_best_aligned_mtu - find best MTU, [hopefully] data size aligned
 *     @mtus: the HW MTU table
 *     @header_size: Header Size
 *     @data_size_max: maximum Data Segment Size
 *     @data_size_align: desired Data Segment Size Alignment (2^N)
 *     @mtu_idxp: HW MTU Table Index return value pointer (possibly NULL)
 *
 *     Similar to cxgb4_best_mtu() but instead of searching the Hardware
 *     MTU Table based solely on a Maximum MTU parameter, we break that
 *     parameter up into a Header Size and Maximum Data Segment Size, and
 *     provide a desired Data Segment Size Alignment.  If we find an MTU in
 *     the Hardware MTU Table which will result in a Data Segment Size with
 *     the requested alignment _and_ that MTU isn't "too far" from the
 *     closest MTU, then we'll return that rather than the closest MTU.
 */
unsigned int cxgb4_best_aligned_mtu(const unsigned short *mtus,
				    unsigned short header_size,
				    unsigned short data_size_max,
				    unsigned short data_size_align,
				    unsigned int *mtu_idxp)
{
	unsigned short max_mtu = header_size + data_size_max;
	unsigned short data_size_align_mask = data_size_align - 1;
	int mtu_idx, aligned_mtu_idx;

	/* Scan the MTU Table till we find an MTU which is larger than our
	 * Maximum MTU or we reach the end of the table.  Along the way,
	 * record the last MTU found, if any, which will result in a Data
	 * Segment Length matching the requested alignment.
	 */
	for (mtu_idx = 0, aligned_mtu_idx = -1; mtu_idx < NMTUS; mtu_idx++) {
		unsigned short data_size = mtus[mtu_idx] - header_size;

		/* If this MTU minus the Header Size would result in a
		 * Data Segment Size of the desired alignment, remember it.
		 */
		if ((data_size & data_size_align_mask) == 0)
			aligned_mtu_idx = mtu_idx;

		/* If we're not at the end of the Hardware MTU Table and the
		 * next element is larger than our Maximum MTU, drop out of
		 * the loop.
		 */
		if (mtu_idx+1 < NMTUS && mtus[mtu_idx+1] > max_mtu)
			break;
	}

	/* If we fell out of the loop because we ran to the end of the table,
	 * then we just have to use the last [largest] entry.
	 */
	if (mtu_idx == NMTUS)
		mtu_idx--;

	/* If we found an MTU which resulted in the requested Data Segment
	 * Length alignment and that's "not far" from the largest MTU which is
	 * less than or equal to the maximum MTU, then use that.
	 */
	if (aligned_mtu_idx >= 0 &&
	    mtu_idx - aligned_mtu_idx <= 1)
		mtu_idx = aligned_mtu_idx;

	/* If the caller has passed in an MTU Index pointer, pass the
	 * MTU Index back.  Return the MTU value.
	 */
	if (mtu_idxp)
		*mtu_idxp = mtu_idx;
	return mtus[mtu_idx];
}
EXPORT_SYMBOL(cxgb4_best_aligned_mtu);

/**
 *	cxgb4_tp_smt_idx - Get the Source Mac Table index for this VI
 *	@chip: chip type
 *	@viid: VI id of the given port
 *
 *	Return the SMT index for this VI.
 */
unsigned int cxgb4_tp_smt_idx(enum chip_type chip, unsigned int viid)
{
	/* In T4/T5, SMT contains 256 SMAC entries organized in
	 * 128 rows of 2 entries each.
	 * In T6, SMT contains 256 SMAC entries in 256 rows.
	 * TODO: The below code needs to be updated when we add support
	 * for 256 VFs.
	 */
	if (CHELSIO_CHIP_VERSION(chip) <= CHELSIO_T5)
		return ((viid & 0x7f) << 1);
	else
		return (viid & 0x7f);
}
EXPORT_SYMBOL(cxgb4_tp_smt_idx);

/**
 *	cxgb4_port_chan - get the HW channel of a port
 *	@dev: the net device for the port
 *
 *	Return the HW Tx channel of the given port.
 */
unsigned int cxgb4_port_chan(const struct net_device *dev)
{
	return netdev2pinfo(dev)->tx_chan;
}
EXPORT_SYMBOL(cxgb4_port_chan);

unsigned int cxgb4_dbfifo_count(const struct net_device *dev, int lpfifo)
{
	struct adapter *adap = netdev2adap(dev);
	u32 v1, v2, lp_count, hp_count;

	v1 = t4_read_reg(adap, SGE_DBFIFO_STATUS_A);
	v2 = t4_read_reg(adap, SGE_DBFIFO_STATUS2_A);
	if (is_t4(adap->params.chip)) {
		lp_count = LP_COUNT_G(v1);
		hp_count = HP_COUNT_G(v1);
	} else {
		lp_count = LP_COUNT_T5_G(v1);
		hp_count = HP_COUNT_T5_G(v2);
	}
	return lpfifo ? lp_count : hp_count;
}
EXPORT_SYMBOL(cxgb4_dbfifo_count);

/**
 *	cxgb4_port_viid - get the VI id of a port
 *	@dev: the net device for the port
 *
 *	Return the VI id of the given port.
 */
unsigned int cxgb4_port_viid(const struct net_device *dev)
{
	return netdev2pinfo(dev)->viid;
}
EXPORT_SYMBOL(cxgb4_port_viid);

/**
 *	cxgb4_port_idx - get the index of a port
 *	@dev: the net device for the port
 *
 *	Return the index of the given port.
 */
unsigned int cxgb4_port_idx(const struct net_device *dev)
{
	return netdev2pinfo(dev)->port_id;
}
EXPORT_SYMBOL(cxgb4_port_idx);

void cxgb4_get_tcp_stats(struct pci_dev *pdev, struct tp_tcp_stats *v4,
			 struct tp_tcp_stats *v6)
{
	struct adapter *adap = pci_get_drvdata(pdev);

	spin_lock(&adap->stats_lock);
	t4_tp_get_tcp_stats(adap, v4, v6);
	spin_unlock(&adap->stats_lock);
}
EXPORT_SYMBOL(cxgb4_get_tcp_stats);

void cxgb4_iscsi_init(struct net_device *dev, unsigned int tag_mask,
		      const unsigned int *pgsz_order)
{
	struct adapter *adap = netdev2adap(dev);

	t4_write_reg(adap, ULP_RX_ISCSI_TAGMASK_A, tag_mask);
	t4_write_reg(adap, ULP_RX_ISCSI_PSZ_A, HPZ0_V(pgsz_order[0]) |
		     HPZ1_V(pgsz_order[1]) | HPZ2_V(pgsz_order[2]) |
		     HPZ3_V(pgsz_order[3]));
}
EXPORT_SYMBOL(cxgb4_iscsi_init);

int cxgb4_flush_eq_cache(struct net_device *dev)
{
	struct adapter *adap = netdev2adap(dev);

	return t4_sge_ctxt_flush(adap, adap->mbox);
}
EXPORT_SYMBOL(cxgb4_flush_eq_cache);

static int read_eq_indices(struct adapter *adap, u16 qid, u16 *pidx, u16 *cidx)
{
	u32 addr = t4_read_reg(adap, SGE_DBQ_CTXT_BADDR_A) + 24 * qid + 8;
	__be64 indices;
	int ret;

	spin_lock(&adap->win0_lock);
	ret = t4_memory_rw(adap, 0, MEM_EDC0, addr,
			   sizeof(indices), (__be32 *)&indices,
			   T4_MEMORY_READ);
	spin_unlock(&adap->win0_lock);
	if (!ret) {
		*cidx = (be64_to_cpu(indices) >> 25) & 0xffff;
		*pidx = (be64_to_cpu(indices) >> 9) & 0xffff;
	}
	return ret;
}

int cxgb4_sync_txq_pidx(struct net_device *dev, u16 qid, u16 pidx,
			u16 size)
{
	struct adapter *adap = netdev2adap(dev);
	u16 hw_pidx, hw_cidx;
	int ret;

	ret = read_eq_indices(adap, qid, &hw_pidx, &hw_cidx);
	if (ret)
		goto out;

	if (pidx != hw_pidx) {
		u16 delta;
		u32 val;

		if (pidx >= hw_pidx)
			delta = pidx - hw_pidx;
		else
			delta = size - hw_pidx + pidx;

		if (is_t4(adap->params.chip))
			val = PIDX_V(delta);
		else
			val = PIDX_T5_V(delta);
		wmb();
		t4_write_reg(adap, MYPF_REG(SGE_PF_KDOORBELL_A),
			     QID_V(qid) | val);
	}
out:
	return ret;
}
EXPORT_SYMBOL(cxgb4_sync_txq_pidx);

int cxgb4_read_tpte(struct net_device *dev, u32 stag, __be32 *tpte)
{
	struct adapter *adap;
	u32 offset, memtype, memaddr;
	u32 edc0_size, edc1_size, mc0_size, mc1_size, size;
	u32 edc0_end, edc1_end, mc0_end, mc1_end;
	int ret;

	adap = netdev2adap(dev);

	offset = ((stag >> 8) * 32) + adap->vres.stag.start;

	/* Figure out where the offset lands in the Memory Type/Address scheme.
	 * This code assumes that the memory is laid out starting at offset 0
	 * with no breaks as: EDC0, EDC1, MC0, MC1. All cards have both EDC0
	 * and EDC1.  Some cards will have neither MC0 nor MC1, most cards have
	 * MC0, and some have both MC0 and MC1.
	 */
	size = t4_read_reg(adap, MA_EDRAM0_BAR_A);
	edc0_size = EDRAM0_SIZE_G(size) << 20;
	size = t4_read_reg(adap, MA_EDRAM1_BAR_A);
	edc1_size = EDRAM1_SIZE_G(size) << 20;
	size = t4_read_reg(adap, MA_EXT_MEMORY0_BAR_A);
	mc0_size = EXT_MEM0_SIZE_G(size) << 20;

	edc0_end = edc0_size;
	edc1_end = edc0_end + edc1_size;
	mc0_end = edc1_end + mc0_size;

	if (offset < edc0_end) {
		memtype = MEM_EDC0;
		memaddr = offset;
	} else if (offset < edc1_end) {
		memtype = MEM_EDC1;
		memaddr = offset - edc0_end;
	} else {
		if (offset < mc0_end) {
			memtype = MEM_MC0;
			memaddr = offset - edc1_end;
		} else if (is_t5(adap->params.chip)) {
			size = t4_read_reg(adap, MA_EXT_MEMORY1_BAR_A);
			mc1_size = EXT_MEM1_SIZE_G(size) << 20;
			mc1_end = mc0_end + mc1_size;
			if (offset < mc1_end) {
				memtype = MEM_MC1;
				memaddr = offset - mc0_end;
			} else {
				/* offset beyond the end of any memory */
				goto err;
			}
		} else {
			/* T4/T6 only has a single memory channel */
			goto err;
		}
	}

	spin_lock(&adap->win0_lock);
	ret = t4_memory_rw(adap, 0, memtype, memaddr, 32, tpte, T4_MEMORY_READ);
	spin_unlock(&adap->win0_lock);
	return ret;

err:
	dev_err(adap->pdev_dev, "stag %#x, offset %#x out of range\n",
		stag, offset);
	return -EINVAL;
}
EXPORT_SYMBOL(cxgb4_read_tpte);

u64 cxgb4_read_sge_timestamp(struct net_device *dev)
{
	u32 hi, lo;
	struct adapter *adap;

	adap = netdev2adap(dev);
	lo = t4_read_reg(adap, SGE_TIMESTAMP_LO_A);
	hi = TSVAL_G(t4_read_reg(adap, SGE_TIMESTAMP_HI_A));

	return ((u64)hi << 32) | (u64)lo;
}
EXPORT_SYMBOL(cxgb4_read_sge_timestamp);

int cxgb4_bar2_sge_qregs(struct net_device *dev,
			 unsigned int qid,
			 enum cxgb4_bar2_qtype qtype,
			 int user,
			 u64 *pbar2_qoffset,
			 unsigned int *pbar2_qid)
{
	return t4_bar2_sge_qregs(netdev2adap(dev),
				 qid,
				 (qtype == CXGB4_BAR2_QTYPE_EGRESS
				  ? T4_BAR2_QTYPE_EGRESS
				  : T4_BAR2_QTYPE_INGRESS),
				 user,
				 pbar2_qoffset,
				 pbar2_qid);
}
EXPORT_SYMBOL(cxgb4_bar2_sge_qregs);

static struct pci_driver cxgb4_driver;

static void check_neigh_update(struct neighbour *neigh)
{
	const struct device *parent;
	const struct net_device *netdev = neigh->dev;

	if (netdev->priv_flags & IFF_802_1Q_VLAN)
		netdev = vlan_dev_real_dev(netdev);
	parent = netdev->dev.parent;
	if (parent && parent->driver == &cxgb4_driver.driver)
		t4_l2t_update(dev_get_drvdata(parent), neigh);
}

static int netevent_cb(struct notifier_block *nb, unsigned long event,
		       void *data)
{
	switch (event) {
	case NETEVENT_NEIGH_UPDATE:
		check_neigh_update(data);
		break;
	case NETEVENT_REDIRECT:
	default:
		break;
	}
	return 0;
}

static bool netevent_registered;
static struct notifier_block cxgb4_netevent_nb = {
	.notifier_call = netevent_cb
};

static void drain_db_fifo(struct adapter *adap, int usecs)
{
	u32 v1, v2, lp_count, hp_count;

	do {
		v1 = t4_read_reg(adap, SGE_DBFIFO_STATUS_A);
		v2 = t4_read_reg(adap, SGE_DBFIFO_STATUS2_A);
		if (is_t4(adap->params.chip)) {
			lp_count = LP_COUNT_G(v1);
			hp_count = HP_COUNT_G(v1);
		} else {
			lp_count = LP_COUNT_T5_G(v1);
			hp_count = HP_COUNT_T5_G(v2);
		}

		if (lp_count == 0 && hp_count == 0)
			break;
		set_current_state(TASK_UNINTERRUPTIBLE);
		schedule_timeout(usecs_to_jiffies(usecs));
	} while (1);
}

static void disable_txq_db(struct sge_txq *q)
{
	unsigned long flags;

	spin_lock_irqsave(&q->db_lock, flags);
	q->db_disabled = 1;
	spin_unlock_irqrestore(&q->db_lock, flags);
}

static void enable_txq_db(struct adapter *adap, struct sge_txq *q)
{
	spin_lock_irq(&q->db_lock);
	if (q->db_pidx_inc) {
		/* Make sure that all writes to the TX descriptors
		 * are committed before we tell HW about them.
		 */
		wmb();
		t4_write_reg(adap, MYPF_REG(SGE_PF_KDOORBELL_A),
			     QID_V(q->cntxt_id) | PIDX_V(q->db_pidx_inc));
		q->db_pidx_inc = 0;
	}
	q->db_disabled = 0;
	spin_unlock_irq(&q->db_lock);
}

static void disable_dbs(struct adapter *adap)
{
	int i;

	for_each_ethrxq(&adap->sge, i)
		disable_txq_db(&adap->sge.ethtxq[i].q);
	for_each_iscsirxq(&adap->sge, i)
		disable_txq_db(&adap->sge.ofldtxq[i].q);
	for_each_port(adap, i)
		disable_txq_db(&adap->sge.ctrlq[i].q);
}

static void enable_dbs(struct adapter *adap)
{
	int i;

	for_each_ethrxq(&adap->sge, i)
		enable_txq_db(adap, &adap->sge.ethtxq[i].q);
	for_each_iscsirxq(&adap->sge, i)
		enable_txq_db(adap, &adap->sge.ofldtxq[i].q);
	for_each_port(adap, i)
		enable_txq_db(adap, &adap->sge.ctrlq[i].q);
}

static void notify_rdma_uld(struct adapter *adap, enum cxgb4_control cmd)
{
	if (adap->uld_handle[CXGB4_ULD_RDMA])
		ulds[CXGB4_ULD_RDMA].control(adap->uld_handle[CXGB4_ULD_RDMA],
				cmd);
}

static void process_db_full(struct work_struct *work)
{
	struct adapter *adap;

	adap = container_of(work, struct adapter, db_full_task);

	drain_db_fifo(adap, dbfifo_drain_delay);
	enable_dbs(adap);
	notify_rdma_uld(adap, CXGB4_CONTROL_DB_EMPTY);
	if (CHELSIO_CHIP_VERSION(adap->params.chip) <= CHELSIO_T5)
		t4_set_reg_field(adap, SGE_INT_ENABLE3_A,
				 DBFIFO_HP_INT_F | DBFIFO_LP_INT_F,
				 DBFIFO_HP_INT_F | DBFIFO_LP_INT_F);
	else
		t4_set_reg_field(adap, SGE_INT_ENABLE3_A,
				 DBFIFO_LP_INT_F, DBFIFO_LP_INT_F);
}

static void sync_txq_pidx(struct adapter *adap, struct sge_txq *q)
{
	u16 hw_pidx, hw_cidx;
	int ret;

	spin_lock_irq(&q->db_lock);
	ret = read_eq_indices(adap, (u16)q->cntxt_id, &hw_pidx, &hw_cidx);
	if (ret)
		goto out;
	if (q->db_pidx != hw_pidx) {
		u16 delta;
		u32 val;

		if (q->db_pidx >= hw_pidx)
			delta = q->db_pidx - hw_pidx;
		else
			delta = q->size - hw_pidx + q->db_pidx;

		if (is_t4(adap->params.chip))
			val = PIDX_V(delta);
		else
			val = PIDX_T5_V(delta);
		wmb();
		t4_write_reg(adap, MYPF_REG(SGE_PF_KDOORBELL_A),
			     QID_V(q->cntxt_id) | val);
	}
out:
	q->db_disabled = 0;
	q->db_pidx_inc = 0;
	spin_unlock_irq(&q->db_lock);
	if (ret)
		CH_WARN(adap, "DB drop recovery failed.\n");
}
static void recover_all_queues(struct adapter *adap)
{
	int i;

	for_each_ethrxq(&adap->sge, i)
		sync_txq_pidx(adap, &adap->sge.ethtxq[i].q);
	for_each_iscsirxq(&adap->sge, i)
		sync_txq_pidx(adap, &adap->sge.ofldtxq[i].q);
	for_each_port(adap, i)
		sync_txq_pidx(adap, &adap->sge.ctrlq[i].q);
}

static void process_db_drop(struct work_struct *work)
{
	struct adapter *adap;

	adap = container_of(work, struct adapter, db_drop_task);

	if (is_t4(adap->params.chip)) {
		drain_db_fifo(adap, dbfifo_drain_delay);
		notify_rdma_uld(adap, CXGB4_CONTROL_DB_DROP);
		drain_db_fifo(adap, dbfifo_drain_delay);
		recover_all_queues(adap);
		drain_db_fifo(adap, dbfifo_drain_delay);
		enable_dbs(adap);
		notify_rdma_uld(adap, CXGB4_CONTROL_DB_EMPTY);
	} else if (is_t5(adap->params.chip)) {
		u32 dropped_db = t4_read_reg(adap, 0x010ac);
		u16 qid = (dropped_db >> 15) & 0x1ffff;
		u16 pidx_inc = dropped_db & 0x1fff;
		u64 bar2_qoffset;
		unsigned int bar2_qid;
		int ret;

		ret = t4_bar2_sge_qregs(adap, qid, T4_BAR2_QTYPE_EGRESS,
					0, &bar2_qoffset, &bar2_qid);
		if (ret)
			dev_err(adap->pdev_dev, "doorbell drop recovery: "
				"qid=%d, pidx_inc=%d\n", qid, pidx_inc);
		else
			writel(PIDX_T5_V(pidx_inc) | QID_V(bar2_qid),
			       adap->bar2 + bar2_qoffset + SGE_UDB_KDOORBELL);

		/* Re-enable BAR2 WC */
		t4_set_reg_field(adap, 0x10b0, 1<<15, 1<<15);
	}

	if (CHELSIO_CHIP_VERSION(adap->params.chip) <= CHELSIO_T5)
		t4_set_reg_field(adap, SGE_DOORBELL_CONTROL_A, DROPPED_DB_F, 0);
}

void t4_db_full(struct adapter *adap)
{
	if (is_t4(adap->params.chip)) {
		disable_dbs(adap);
		notify_rdma_uld(adap, CXGB4_CONTROL_DB_FULL);
		t4_set_reg_field(adap, SGE_INT_ENABLE3_A,
				 DBFIFO_HP_INT_F | DBFIFO_LP_INT_F, 0);
		queue_work(adap->workq, &adap->db_full_task);
	}
}

void t4_db_dropped(struct adapter *adap)
{
	if (is_t4(adap->params.chip)) {
		disable_dbs(adap);
		notify_rdma_uld(adap, CXGB4_CONTROL_DB_FULL);
	}
	queue_work(adap->workq, &adap->db_drop_task);
}

static void uld_attach(struct adapter *adap, unsigned int uld)
{
	void *handle;
	struct cxgb4_lld_info lli;
	unsigned short i;

	lli.pdev = adap->pdev;
	lli.pf = adap->pf;
	lli.l2t = adap->l2t;
	lli.tids = &adap->tids;
	lli.ports = adap->port;
	lli.vr = &adap->vres;
	lli.mtus = adap->params.mtus;
	if (uld == CXGB4_ULD_RDMA) {
		lli.rxq_ids = adap->sge.rdma_rxq;
		lli.ciq_ids = adap->sge.rdma_ciq;
		lli.nrxq = adap->sge.rdmaqs;
		lli.nciq = adap->sge.rdmaciqs;
	} else if (uld == CXGB4_ULD_ISCSI) {
		lli.rxq_ids = adap->sge.iscsi_rxq;
		lli.nrxq = adap->sge.iscsiqsets;
	}
	lli.ntxq = adap->sge.iscsiqsets;
	lli.nchan = adap->params.nports;
	lli.nports = adap->params.nports;
	lli.wr_cred = adap->params.ofldq_wr_cred;
	lli.adapter_type = adap->params.chip;
	lli.iscsi_iolen = MAXRXDATA_G(t4_read_reg(adap, TP_PARA_REG2_A));
	lli.cclk_ps = 1000000000 / adap->params.vpd.cclk;
	lli.udb_density = 1 << adap->params.sge.eq_qpp;
	lli.ucq_density = 1 << adap->params.sge.iq_qpp;
	lli.filt_mode = adap->params.tp.vlan_pri_map;
	/* MODQ_REQ_MAP sets queues 0-3 to chan 0-3 */
	for (i = 0; i < NCHAN; i++)
		lli.tx_modq[i] = i;
	lli.gts_reg = adap->regs + MYPF_REG(SGE_PF_GTS_A);
	lli.db_reg = adap->regs + MYPF_REG(SGE_PF_KDOORBELL_A);
	lli.fw_vers = adap->params.fw_vers;
	lli.dbfifo_int_thresh = dbfifo_int_thresh;
	lli.sge_ingpadboundary = adap->sge.fl_align;
	lli.sge_egrstatuspagesize = adap->sge.stat_len;
	lli.sge_pktshift = adap->sge.pktshift;
	lli.enable_fw_ofld_conn = adap->flags & FW_OFLD_CONN;
	lli.max_ordird_qp = adap->params.max_ordird_qp;
	lli.max_ird_adapter = adap->params.max_ird_adapter;
	lli.ulptx_memwrite_dsgl = adap->params.ulptx_memwrite_dsgl;
	lli.nodeid = dev_to_node(adap->pdev_dev);

	handle = ulds[uld].add(&lli);
	if (IS_ERR(handle)) {
		dev_warn(adap->pdev_dev,
			 "could not attach to the %s driver, error %ld\n",
			 uld_str[uld], PTR_ERR(handle));
		return;
	}

	adap->uld_handle[uld] = handle;

	if (!netevent_registered) {
		register_netevent_notifier(&cxgb4_netevent_nb);
		netevent_registered = true;
	}

	if (adap->flags & FULL_INIT_DONE)
		ulds[uld].state_change(handle, CXGB4_STATE_UP);
}

static void attach_ulds(struct adapter *adap)
{
	unsigned int i;

	spin_lock(&adap_rcu_lock);
	list_add_tail_rcu(&adap->rcu_node, &adap_rcu_list);
	spin_unlock(&adap_rcu_lock);

	mutex_lock(&uld_mutex);
	list_add_tail(&adap->list_node, &adapter_list);
	for (i = 0; i < CXGB4_ULD_MAX; i++)
		if (ulds[i].add)
			uld_attach(adap, i);
	mutex_unlock(&uld_mutex);
}

static void detach_ulds(struct adapter *adap)
{
	unsigned int i;

	mutex_lock(&uld_mutex);
	list_del(&adap->list_node);
	for (i = 0; i < CXGB4_ULD_MAX; i++)
		if (adap->uld_handle[i]) {
			ulds[i].state_change(adap->uld_handle[i],
					     CXGB4_STATE_DETACH);
			adap->uld_handle[i] = NULL;
		}
	if (netevent_registered && list_empty(&adapter_list)) {
		unregister_netevent_notifier(&cxgb4_netevent_nb);
		netevent_registered = false;
	}
	mutex_unlock(&uld_mutex);

	spin_lock(&adap_rcu_lock);
	list_del_rcu(&adap->rcu_node);
	spin_unlock(&adap_rcu_lock);
}

static void notify_ulds(struct adapter *adap, enum cxgb4_state new_state)
{
	unsigned int i;

	mutex_lock(&uld_mutex);
	for (i = 0; i < CXGB4_ULD_MAX; i++)
		if (adap->uld_handle[i])
			ulds[i].state_change(adap->uld_handle[i], new_state);
	mutex_unlock(&uld_mutex);
}

/**
 *	cxgb4_register_uld - register an upper-layer driver
 *	@type: the ULD type
 *	@p: the ULD methods
 *
 *	Registers an upper-layer driver with this driver and notifies the ULD
 *	about any presently available devices that support its type.  Returns
 *	%-EBUSY if a ULD of the same type is already registered.
 */
int cxgb4_register_uld(enum cxgb4_uld type, const struct cxgb4_uld_info *p)
{
	int ret = 0;
	struct adapter *adap;

	if (type >= CXGB4_ULD_MAX)
		return -EINVAL;
	mutex_lock(&uld_mutex);
	if (ulds[type].add) {
		ret = -EBUSY;
		goto out;
	}
	ulds[type] = *p;
	list_for_each_entry(adap, &adapter_list, list_node)
		uld_attach(adap, type);
out:	mutex_unlock(&uld_mutex);
	return ret;
}
EXPORT_SYMBOL(cxgb4_register_uld);

/**
 *	cxgb4_unregister_uld - unregister an upper-layer driver
 *	@type: the ULD type
 *
 *	Unregisters an existing upper-layer driver.
 */
int cxgb4_unregister_uld(enum cxgb4_uld type)
{
	struct adapter *adap;

	if (type >= CXGB4_ULD_MAX)
		return -EINVAL;
	mutex_lock(&uld_mutex);
	list_for_each_entry(adap, &adapter_list, list_node)
		adap->uld_handle[type] = NULL;
	ulds[type].add = NULL;
	mutex_unlock(&uld_mutex);
	return 0;
}
EXPORT_SYMBOL(cxgb4_unregister_uld);

#if IS_ENABLED(CONFIG_IPV6)
static int cxgb4_inet6addr_handler(struct notifier_block *this,
				   unsigned long event, void *data)
{
	struct inet6_ifaddr *ifa = data;
	struct net_device *event_dev = ifa->idev->dev;
	const struct device *parent = NULL;
#if IS_ENABLED(CONFIG_BONDING)
	struct adapter *adap;
#endif
	if (event_dev->priv_flags & IFF_802_1Q_VLAN)
		event_dev = vlan_dev_real_dev(event_dev);
#if IS_ENABLED(CONFIG_BONDING)
	if (event_dev->flags & IFF_MASTER) {
		list_for_each_entry(adap, &adapter_list, list_node) {
			switch (event) {
			case NETDEV_UP:
				cxgb4_clip_get(adap->port[0],
					       (const u32 *)ifa, 1);
				break;
			case NETDEV_DOWN:
				cxgb4_clip_release(adap->port[0],
						   (const u32 *)ifa, 1);
				break;
			default:
				break;
			}
		}
		return NOTIFY_OK;
	}
#endif

	if (event_dev)
		parent = event_dev->dev.parent;

	if (parent && parent->driver == &cxgb4_driver.driver) {
		switch (event) {
		case NETDEV_UP:
			cxgb4_clip_get(event_dev, (const u32 *)ifa, 1);
			break;
		case NETDEV_DOWN:
			cxgb4_clip_release(event_dev, (const u32 *)ifa, 1);
			break;
		default:
			break;
		}
	}
	return NOTIFY_OK;
}

static bool inet6addr_registered;
static struct notifier_block cxgb4_inet6addr_notifier = {
	.notifier_call = cxgb4_inet6addr_handler
};

static void update_clip(const struct adapter *adap)
{
	int i;
	struct net_device *dev;
	int ret;

	rcu_read_lock();

	for (i = 0; i < MAX_NPORTS; i++) {
		dev = adap->port[i];
		ret = 0;

		if (dev)
			ret = cxgb4_update_root_dev_clip(dev);

		if (ret < 0)
			break;
	}
	rcu_read_unlock();
}
#endif /* IS_ENABLED(CONFIG_IPV6) */

/**
 *	cxgb_up - enable the adapter
 *	@adap: adapter being enabled
 *
 *	Called when the first port is enabled, 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.
 */
static int cxgb_up(struct adapter *adap)
{
	int err;

	err = setup_sge_queues(adap);
	if (err)
		goto out;
	err = setup_rss(adap);
	if (err)
		goto freeq;

	if (adap->flags & USING_MSIX) {
		name_msix_vecs(adap);
		err = request_irq(adap->msix_info[0].vec, t4_nondata_intr, 0,
				  adap->msix_info[0].desc, adap);
		if (err)
			goto irq_err;

		err = request_msix_queue_irqs(adap);
		if (err) {
			free_irq(adap->msix_info[0].vec, adap);
			goto irq_err;
		}
	} else {
		err = request_irq(adap->pdev->irq, t4_intr_handler(adap),
				  (adap->flags & USING_MSI) ? 0 : IRQF_SHARED,
				  adap->port[0]->name, adap);
		if (err)
			goto irq_err;
	}
	enable_rx(adap);
	t4_sge_start(adap);
	t4_intr_enable(adap);
	adap->flags |= FULL_INIT_DONE;
	notify_ulds(adap, CXGB4_STATE_UP);
#if IS_ENABLED(CONFIG_IPV6)
	update_clip(adap);
#endif
 out:
	return err;
 irq_err:
	dev_err(adap->pdev_dev, "request_irq failed, err %d\n", err);
 freeq:
	t4_free_sge_resources(adap);
	goto out;
}

static void cxgb_down(struct adapter *adapter)
{
	cancel_work_sync(&adapter->tid_release_task);
	cancel_work_sync(&adapter->db_full_task);
	cancel_work_sync(&adapter->db_drop_task);
	adapter->tid_release_task_busy = false;
	adapter->tid_release_head = NULL;

	t4_sge_stop(adapter);
	t4_free_sge_resources(adapter);
	adapter->flags &= ~FULL_INIT_DONE;
}

/*
 * net_device operations
 */
static int cxgb_open(struct net_device *dev)
{
	int err;
	struct port_info *pi = netdev_priv(dev);
	struct adapter *adapter = pi->adapter;

	netif_carrier_off(dev);

	if (!(adapter->flags & FULL_INIT_DONE)) {
		err = cxgb_up(adapter);
		if (err < 0)
			return err;
	}

	err = link_start(dev);
	if (!err)
		netif_tx_start_all_queues(dev);
	return err;
}

static int cxgb_close(struct net_device *dev)
{
	struct port_info *pi = netdev_priv(dev);
	struct adapter *adapter = pi->adapter;

	netif_tx_stop_all_queues(dev);
	netif_carrier_off(dev);
	return t4_enable_vi(adapter, adapter->pf, pi->viid, false, false);
}

/* Return an error number if the indicated filter isn't writable ...
 */
static int writable_filter(struct filter_entry *f)
{
	if (f->locked)
		return -EPERM;
	if (f->pending)
		return -EBUSY;

	return 0;
}

/* Delete the filter at the specified index (if valid).  The checks for all
 * the common problems with doing this like the filter being locked, currently
 * pending in another operation, etc.
 */
static int delete_filter(struct adapter *adapter, unsigned int fidx)
{
	struct filter_entry *f;
	int ret;

	if (fidx >= adapter->tids.nftids + adapter->tids.nsftids)
		return -EINVAL;

	f = &adapter->tids.ftid_tab[fidx];
	ret = writable_filter(f);
	if (ret)
		return ret;
	if (f->valid)
		return del_filter_wr(adapter, fidx);

	return 0;
}

int cxgb4_create_server_filter(const struct net_device *dev, unsigned int stid,
		__be32 sip, __be16 sport, __be16 vlan,
		unsigned int queue, unsigned char port, unsigned char mask)
{
	int ret;
	struct filter_entry *f;
	struct adapter *adap;
	int i;
	u8 *val;

	adap = netdev2adap(dev);

	/* Adjust stid to correct filter index */
	stid -= adap->tids.sftid_base;
	stid += adap->tids.nftids;

	/* Check to make sure the filter requested is writable ...
	 */
	f = &adap->tids.ftid_tab[stid];
	ret = writable_filter(f);
	if (ret)
		return ret;

	/* Clear out any old resources being used by the filter before
	 * we start constructing the new filter.
	 */
	if (f->valid)
		clear_filter(adap, f);

	/* Clear out filter specifications */
	memset(&f->fs, 0, sizeof(struct ch_filter_specification));
	f->fs.val.lport = cpu_to_be16(sport);
	f->fs.mask.lport  = ~0;
	val = (u8 *)&sip;
	if ((val[0] | val[1] | val[2] | val[3]) != 0) {
		for (i = 0; i < 4; i++) {
			f->fs.val.lip[i] = val[i];
			f->fs.mask.lip[i] = ~0;
		}
		if (adap->params.tp.vlan_pri_map & PORT_F) {
			f->fs.val.iport = port;
			f->fs.mask.iport = mask;
		}
	}

	if (adap->params.tp.vlan_pri_map & PROTOCOL_F) {
		f->fs.val.proto = IPPROTO_TCP;
		f->fs.mask.proto = ~0;
	}

	f->fs.dirsteer = 1;
	f->fs.iq = queue;
	/* Mark filter as locked */
	f->locked = 1;
	f->fs.rpttid = 1;

	ret = set_filter_wr(adap, stid);
	if (ret) {
		clear_filter(adap, f);
		return ret;
	}

	return 0;
}
EXPORT_SYMBOL(cxgb4_create_server_filter);

int cxgb4_remove_server_filter(const struct net_device *dev, unsigned int stid,
		unsigned int queue, bool ipv6)
{
	int ret;
	struct filter_entry *f;
	struct adapter *adap;

	adap = netdev2adap(dev);

	/* Adjust stid to correct filter index */
	stid -= adap->tids.sftid_base;
	stid += adap->tids.nftids;

	f = &adap->tids.ftid_tab[stid];
	/* Unlock the filter */
	f->locked = 0;

	ret = delete_filter(adap, stid);
	if (ret)
		return ret;

	return 0;
}
EXPORT_SYMBOL(cxgb4_remove_server_filter);

static struct rtnl_link_stats64 *cxgb_get_stats(struct net_device *dev,
						struct rtnl_link_stats64 *ns)
{
	struct port_stats stats;
	struct port_info *p = netdev_priv(dev);
	struct adapter *adapter = p->adapter;

	/* Block retrieving statistics during EEH error
	 * recovery. Otherwise, the recovery might fail
	 * and the PCI device will be removed permanently
	 */
	spin_lock(&adapter->stats_lock);
	if (!netif_device_present(dev)) {
		spin_unlock(&adapter->stats_lock);
		return ns;
	}
	t4_get_port_stats_offset(adapter, p->tx_chan, &stats,
				 &p->stats_base);
	spin_unlock(&adapter->stats_lock);

	ns->tx_bytes   = stats.tx_octets;
	ns->tx_packets = stats.tx_frames;
	ns->rx_bytes   = stats.rx_octets;
	ns->rx_packets = stats.rx_frames;
	ns->multicast  = stats.rx_mcast_frames;

	/* detailed rx_errors */
	ns->rx_length_errors = stats.rx_jabber + stats.rx_too_long +
			       stats.rx_runt;
	ns->rx_over_errors   = 0;
	ns->rx_crc_errors    = stats.rx_fcs_err;
	ns->rx_frame_errors  = stats.rx_symbol_err;
	ns->rx_fifo_errors   = stats.rx_ovflow0 + stats.rx_ovflow1 +
			       stats.rx_ovflow2 + stats.rx_ovflow3 +
			       stats.rx_trunc0 + stats.rx_trunc1 +
			       stats.rx_trunc2 + stats.rx_trunc3;
	ns->rx_missed_errors = 0;

	/* detailed tx_errors */
	ns->tx_aborted_errors   = 0;
	ns->tx_carrier_errors   = 0;
	ns->tx_fifo_errors      = 0;
	ns->tx_heartbeat_errors = 0;
	ns->tx_window_errors    = 0;

	ns->tx_errors = stats.tx_error_frames;
	ns->rx_errors = stats.rx_symbol_err + stats.rx_fcs_err +
		ns->rx_length_errors + stats.rx_len_err + ns->rx_fifo_errors;
	return ns;
}

static int cxgb_ioctl(struct net_device *dev, struct ifreq *req, int cmd)
{
	unsigned int mbox;
	int ret = 0, prtad, devad;
	struct port_info *pi = netdev_priv(dev);
	struct mii_ioctl_data *data = (struct mii_ioctl_data *)&req->ifr_data;

	switch (cmd) {
	case SIOCGMIIPHY:
		if (pi->mdio_addr < 0)
			return -EOPNOTSUPP;
		data->phy_id = pi->mdio_addr;
		break;
	case SIOCGMIIREG:
	case SIOCSMIIREG:
		if (mdio_phy_id_is_c45(data->phy_id)) {
			prtad = mdio_phy_id_prtad(data->phy_id);
			devad = mdio_phy_id_devad(data->phy_id);
		} else if (data->phy_id < 32) {
			prtad = data->phy_id;
			devad = 0;
			data->reg_num &= 0x1f;
		} else
			return -EINVAL;

		mbox = pi->adapter->pf;
		if (cmd == SIOCGMIIREG)
			ret = t4_mdio_rd(pi->adapter, mbox, prtad, devad,
					 data->reg_num, &data->val_out);
		else
			ret = t4_mdio_wr(pi->adapter, mbox, prtad, devad,
					 data->reg_num, data->val_in);
		break;
	case SIOCGHWTSTAMP:
		return copy_to_user(req->ifr_data, &pi->tstamp_config,
				    sizeof(pi->tstamp_config)) ?
			-EFAULT : 0;
	case SIOCSHWTSTAMP:
		if (copy_from_user(&pi->tstamp_config, req->ifr_data,
				   sizeof(pi->tstamp_config)))
			return -EFAULT;

		switch (pi->tstamp_config.rx_filter) {
		case HWTSTAMP_FILTER_NONE:
			pi->rxtstamp = false;
			break;
		case HWTSTAMP_FILTER_ALL:
			pi->rxtstamp = true;
			break;
		default:
			pi->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
			return -ERANGE;
		}

		return copy_to_user(req->ifr_data, &pi->tstamp_config,
				    sizeof(pi->tstamp_config)) ?
			-EFAULT : 0;
	default:
		return -EOPNOTSUPP;
	}
	return ret;
}

static void cxgb_set_rxmode(struct net_device *dev)
{
	/* unfortunately we can't return errors to the stack */
	set_rxmode(dev, -1, false);
}

static int cxgb_change_mtu(struct net_device *dev, int new_mtu)
{
	int ret;
	struct port_info *pi = netdev_priv(dev);

	if (new_mtu < 81 || new_mtu > MAX_MTU)         /* accommodate SACK */
		return -EINVAL;
	ret = t4_set_rxmode(pi->adapter, pi->adapter->pf, pi->viid, new_mtu, -1,
			    -1, -1, -1, true);
	if (!ret)
		dev->mtu = new_mtu;
	return ret;
}

static int cxgb_set_mac_addr(struct net_device *dev, void *p)
{
	int ret;
	struct sockaddr *addr = p;
	struct port_info *pi = netdev_priv(dev);

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	ret = t4_change_mac(pi->adapter, pi->adapter->pf, pi->viid,
			    pi->xact_addr_filt, addr->sa_data, true, true);
	if (ret < 0)
		return ret;

	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
	pi->xact_addr_filt = ret;
	return 0;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void cxgb_netpoll(struct net_device *dev)
{
	struct port_info *pi = netdev_priv(dev);
	struct adapter *adap = pi->adapter;

	if (adap->flags & USING_MSIX) {
		int i;
		struct sge_eth_rxq *rx = &adap->sge.ethrxq[pi->first_qset];

		for (i = pi->nqsets; i; i--, rx++)
			t4_sge_intr_msix(0, &rx->rspq);
	} else
		t4_intr_handler(adap)(0, adap);
}
#endif

static const struct net_device_ops cxgb4_netdev_ops = {
	.ndo_open             = cxgb_open,
	.ndo_stop             = cxgb_close,
	.ndo_start_xmit       = t4_eth_xmit,
	.ndo_select_queue     =	cxgb_select_queue,
	.ndo_get_stats64      = cxgb_get_stats,
	.ndo_set_rx_mode      = cxgb_set_rxmode,
	.ndo_set_mac_address  = cxgb_set_mac_addr,
	.ndo_set_features     = cxgb_set_features,
	.ndo_validate_addr    = eth_validate_addr,
	.ndo_do_ioctl         = cxgb_ioctl,
	.ndo_change_mtu       = cxgb_change_mtu,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller  = cxgb_netpoll,
#endif
#ifdef CONFIG_CHELSIO_T4_FCOE
	.ndo_fcoe_enable      = cxgb_fcoe_enable,
	.ndo_fcoe_disable     = cxgb_fcoe_disable,
#endif /* CONFIG_CHELSIO_T4_FCOE */
#ifdef CONFIG_NET_RX_BUSY_POLL
	.ndo_busy_poll        = cxgb_busy_poll,
#endif

};

void t4_fatal_err(struct adapter *adap)
{
	t4_set_reg_field(adap, SGE_CONTROL_A, GLOBALENABLE_F, 0);
	t4_intr_disable(adap);
	dev_alert(adap->pdev_dev, "encountered fatal error, adapter stopped\n");
}

static void setup_memwin(struct adapter *adap)
{
	u32 nic_win_base = t4_get_util_window(adap);

	t4_setup_memwin(adap, nic_win_base, MEMWIN_NIC);
}

static void setup_memwin_rdma(struct adapter *adap)
{
	if (adap->vres.ocq.size) {
		u32 start;
		unsigned int sz_kb;

		start = t4_read_pcie_cfg4(adap, PCI_BASE_ADDRESS_2);
		start &= PCI_BASE_ADDRESS_MEM_MASK;
		start += OCQ_WIN_OFFSET(adap->pdev, &adap->vres);
		sz_kb = roundup_pow_of_two(adap->vres.ocq.size) >> 10;
		t4_write_reg(adap,
			     PCIE_MEM_ACCESS_REG(PCIE_MEM_ACCESS_BASE_WIN_A, 3),
			     start | BIR_V(1) | WINDOW_V(ilog2(sz_kb)));
		t4_write_reg(adap,
			     PCIE_MEM_ACCESS_REG(PCIE_MEM_ACCESS_OFFSET_A, 3),
			     adap->vres.ocq.start);
		t4_read_reg(adap,
			    PCIE_MEM_ACCESS_REG(PCIE_MEM_ACCESS_OFFSET_A, 3));
	}
}

static int adap_init1(struct adapter *adap, struct fw_caps_config_cmd *c)
{
	u32 v;
	int ret;

	/* get device capabilities */
	memset(c, 0, sizeof(*c));
	c->op_to_write = htonl(FW_CMD_OP_V(FW_CAPS_CONFIG_CMD) |
			       FW_CMD_REQUEST_F | FW_CMD_READ_F);
	c->cfvalid_to_len16 = htonl(FW_LEN16(*c));
	ret = t4_wr_mbox(adap, adap->mbox, c, sizeof(*c), c);
	if (ret < 0)
		return ret;

	c->op_to_write = htonl(FW_CMD_OP_V(FW_CAPS_CONFIG_CMD) |
			       FW_CMD_REQUEST_F | FW_CMD_WRITE_F);
	ret = t4_wr_mbox(adap, adap->mbox, c, sizeof(*c), NULL);
	if (ret < 0)
		return ret;

	ret = t4_config_glbl_rss(adap, adap->pf,
				 FW_RSS_GLB_CONFIG_CMD_MODE_BASICVIRTUAL,
				 FW_RSS_GLB_CONFIG_CMD_TNLMAPEN_F |
				 FW_RSS_GLB_CONFIG_CMD_TNLALLLKP_F);
	if (ret < 0)
		return ret;

	ret = t4_cfg_pfvf(adap, adap->mbox, adap->pf, 0, adap->sge.egr_sz, 64,
			  MAX_INGQ, 0, 0, 4, 0xf, 0xf, 16, FW_CMD_CAP_PF,
			  FW_CMD_CAP_PF);
	if (ret < 0)
		return ret;

	t4_sge_init(adap);

	/* tweak some settings */
	t4_write_reg(adap, TP_SHIFT_CNT_A, 0x64f8849);
	t4_write_reg(adap, ULP_RX_TDDP_PSZ_A, HPZ0_V(PAGE_SHIFT - 12));
	t4_write_reg(adap, TP_PIO_ADDR_A, TP_INGRESS_CONFIG_A);
	v = t4_read_reg(adap, TP_PIO_DATA_A);
	t4_write_reg(adap, TP_PIO_DATA_A, v & ~CSUM_HAS_PSEUDO_HDR_F);

	/* first 4 Tx modulation queues point to consecutive Tx channels */
	adap->params.tp.tx_modq_map = 0xE4;
	t4_write_reg(adap, TP_TX_MOD_QUEUE_REQ_MAP_A,
		     TX_MOD_QUEUE_REQ_MAP_V(adap->params.tp.tx_modq_map));

	/* associate each Tx modulation queue with consecutive Tx channels */
	v = 0x84218421;
	t4_write_indirect(adap, TP_PIO_ADDR_A, TP_PIO_DATA_A,
			  &v, 1, TP_TX_SCHED_HDR_A);
	t4_write_indirect(adap, TP_PIO_ADDR_A, TP_PIO_DATA_A,
			  &v, 1, TP_TX_SCHED_FIFO_A);
	t4_write_indirect(adap, TP_PIO_ADDR_A, TP_PIO_DATA_A,
			  &v, 1, TP_TX_SCHED_PCMD_A);

#define T4_TX_MODQ_10G_WEIGHT_DEFAULT 16 /* in KB units */
	if (is_offload(adap)) {
		t4_write_reg(adap, TP_TX_MOD_QUEUE_WEIGHT0_A,
			     TX_MODQ_WEIGHT0_V(T4_TX_MODQ_10G_WEIGHT_DEFAULT) |
			     TX_MODQ_WEIGHT1_V(T4_TX_MODQ_10G_WEIGHT_DEFAULT) |
			     TX_MODQ_WEIGHT2_V(T4_TX_MODQ_10G_WEIGHT_DEFAULT) |
			     TX_MODQ_WEIGHT3_V(T4_TX_MODQ_10G_WEIGHT_DEFAULT));
		t4_write_reg(adap, TP_TX_MOD_CHANNEL_WEIGHT_A,
			     TX_MODQ_WEIGHT0_V(T4_TX_MODQ_10G_WEIGHT_DEFAULT) |
			     TX_MODQ_WEIGHT1_V(T4_TX_MODQ_10G_WEIGHT_DEFAULT) |
			     TX_MODQ_WEIGHT2_V(T4_TX_MODQ_10G_WEIGHT_DEFAULT) |
			     TX_MODQ_WEIGHT3_V(T4_TX_MODQ_10G_WEIGHT_DEFAULT));
	}

	/* get basic stuff going */
	return t4_early_init(adap, adap->pf);
}

/*
 * Max # of ATIDs.  The absolute HW max is 16K but we keep it lower.
 */
#define MAX_ATIDS 8192U

/*
 * Phase 0 of initialization: contact FW, obtain config, perform basic init.
 *
 * If the firmware we're dealing with has Configuration File support, then
 * we use that to perform all configuration
 */

/*
 * Tweak configuration based on module parameters, etc.  Most of these have
 * defaults assigned to them by Firmware Configuration Files (if we're using
 * them) but need to be explicitly set if we're using hard-coded
 * initialization.  But even in the case of using Firmware Configuration
 * Files, we'd like to expose the ability to change these via module
 * parameters so these are essentially common tweaks/settings for
 * Configuration Files and hard-coded initialization ...
 */
static int adap_init0_tweaks(struct adapter *adapter)
{
	/*
	 * Fix up various Host-Dependent Parameters like Page Size, Cache
	 * Line Size, etc.  The firmware default is for a 4KB Page Size and
	 * 64B Cache Line Size ...
	 */
	t4_fixup_host_params(adapter, PAGE_SIZE, L1_CACHE_BYTES);

	/*
	 * Process module parameters which affect early initialization.
	 */
	if (rx_dma_offset != 2 && rx_dma_offset != 0) {
		dev_err(&adapter->pdev->dev,
			"Ignoring illegal rx_dma_offset=%d, using 2\n",
			rx_dma_offset);
		rx_dma_offset = 2;
	}
	t4_set_reg_field(adapter, SGE_CONTROL_A,
			 PKTSHIFT_V(PKTSHIFT_M),
			 PKTSHIFT_V(rx_dma_offset));

	/*
	 * Don't include the "IP Pseudo Header" in CPL_RX_PKT checksums: Linux
	 * adds the pseudo header itself.
	 */
	t4_tp_wr_bits_indirect(adapter, TP_INGRESS_CONFIG_A,
			       CSUM_HAS_PSEUDO_HDR_F, 0);

	return 0;
}

/* 10Gb/s-BT PHY Support. chip-external 10Gb/s-BT PHYs are complex chips
 * unto themselves and they contain their own firmware to perform their
 * tasks ...
 */
static int phy_aq1202_version(const u8 *phy_fw_data,
			      size_t phy_fw_size)
{
	int offset;

	/* At offset 0x8 you're looking for the primary image's
	 * starting offset which is 3 Bytes wide
	 *
	 * At offset 0xa of the primary image, you look for the offset
	 * of the DRAM segment which is 3 Bytes wide.
	 *
	 * The FW version is at offset 0x27e of the DRAM and is 2 Bytes
	 * wide
	 */
	#define be16(__p) (((__p)[0] << 8) | (__p)[1])
	#define le16(__p) ((__p)[0] | ((__p)[1] << 8))
	#define le24(__p) (le16(__p) | ((__p)[2] << 16))

	offset = le24(phy_fw_data + 0x8) << 12;
	offset = le24(phy_fw_data + offset + 0xa);
	return be16(phy_fw_data + offset + 0x27e);

	#undef be16
	#undef le16
	#undef le24
}

static struct info_10gbt_phy_fw {
	unsigned int phy_fw_id;		/* PCI Device ID */
	char *phy_fw_file;		/* /lib/firmware/ PHY Firmware file */
	int (*phy_fw_version)(const u8 *phy_fw_data, size_t phy_fw_size);
	int phy_flash;			/* Has FLASH for PHY Firmware */
} phy_info_array[] = {
	{
		PHY_AQ1202_DEVICEID,
		PHY_AQ1202_FIRMWARE,
		phy_aq1202_version,
		1,
	},
	{
		PHY_BCM84834_DEVICEID,
		PHY_BCM84834_FIRMWARE,
		NULL,
		0,
	},
	{ 0, NULL, NULL },
};

static struct info_10gbt_phy_fw *find_phy_info(int devid)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(phy_info_array); i++) {
		if (phy_info_array[i].phy_fw_id == devid)
			return &phy_info_array[i];
	}
	return NULL;
}

/* Handle updating of chip-external 10Gb/s-BT PHY firmware.  This needs to
 * happen after the FW_RESET_CMD but before the FW_INITIALIZE_CMD.  On error
 * we return a negative error number.  If we transfer new firmware we return 1
 * (from t4_load_phy_fw()).  If we don't do anything we return 0.
 */
static int adap_init0_phy(struct adapter *adap)
{
	const struct firmware *phyf;
	int ret;
	struct info_10gbt_phy_fw *phy_info;

	/* Use the device ID to determine which PHY file to flash.
	 */
	phy_info = find_phy_info(adap->pdev->device);
	if (!phy_info) {
		dev_warn(adap->pdev_dev,
			 "No PHY Firmware file found for this PHY\n");
		return -EOPNOTSUPP;
	}

	/* If we have a T4 PHY firmware file under /lib/firmware/cxgb4/, then
	 * use that. The adapter firmware provides us with a memory buffer
	 * where we can load a PHY firmware file from the host if we want to
	 * override the PHY firmware File in flash.
	 */
	ret = request_firmware_direct(&phyf, phy_info->phy_fw_file,
				      adap->pdev_dev);
	if (ret < 0) {
		/* For adapters without FLASH attached to PHY for their
		 * firmware, it's obviously a fatal error if we can't get the
		 * firmware to the adapter.  For adapters with PHY firmware
		 * FLASH storage, it's worth a warning if we can't find the
		 * PHY Firmware but we'll neuter the error ...
		 */
		dev_err(adap->pdev_dev, "unable to find PHY Firmware image "
			"/lib/firmware/%s, error %d\n",
			phy_info->phy_fw_file, -ret);
		if (phy_info->phy_flash) {
			int cur_phy_fw_ver = 0;

			t4_phy_fw_ver(adap, &cur_phy_fw_ver);
			dev_warn(adap->pdev_dev, "continuing with, on-adapter "
				 "FLASH copy, version %#x\n", cur_phy_fw_ver);
			ret = 0;
		}

		return ret;
	}

	/* Load PHY Firmware onto adapter.
	 */
	ret = t4_load_phy_fw(adap, MEMWIN_NIC, &adap->win0_lock,
			     phy_info->phy_fw_version,
			     (u8 *)phyf->data, phyf->size);
	if (ret < 0)
		dev_err(adap->pdev_dev, "PHY Firmware transfer error %d\n",
			-ret);
	else if (ret > 0) {
		int new_phy_fw_ver = 0;

		if (phy_info->phy_fw_version)
			new_phy_fw_ver = phy_info->phy_fw_version(phyf->data,
								  phyf->size);
		dev_info(adap->pdev_dev, "Successfully transferred PHY "
			 "Firmware /lib/firmware/%s, version %#x\n",
			 phy_info->phy_fw_file, new_phy_fw_ver);
	}

	release_firmware(phyf);

	return ret;
}

/*
 * Attempt to initialize the adapter via a Firmware Configuration File.
 */
static int adap_init0_config(struct adapter *adapter, int reset)
{
	struct fw_caps_config_cmd caps_cmd;
	const struct firmware *cf;
	unsigned long mtype = 0, maddr = 0;
	u32 finiver, finicsum, cfcsum;
	int ret;
	int config_issued = 0;
	char *fw_config_file, fw_config_file_path[256];
	char *config_name = NULL;

	/*
	 * Reset device if necessary.
	 */
	if (reset) {
		ret = t4_fw_reset(adapter, adapter->mbox,
				  PIORSTMODE_F | PIORST_F);
		if (ret < 0)
			goto bye;
	}

	/* If this is a 10Gb/s-BT adapter make sure the chip-external
	 * 10Gb/s-BT PHYs have up-to-date firmware.  Note that this step needs
	 * to be performed after any global adapter RESET above since some
	 * PHYs only have local RAM copies of the PHY firmware.
	 */
	if (is_10gbt_device(adapter->pdev->device)) {
		ret = adap_init0_phy(adapter);
		if (ret < 0)
			goto bye;
	}
	/*
	 * If we have a T4 configuration file under /lib/firmware/cxgb4/,
	 * then use that.  Otherwise, use the configuration file stored
	 * in the adapter flash ...
	 */
	switch (CHELSIO_CHIP_VERSION(adapter->params.chip)) {
	case CHELSIO_T4:
		fw_config_file = FW4_CFNAME;
		break;
	case CHELSIO_T5:
		fw_config_file = FW5_CFNAME;
		break;
	case CHELSIO_T6:
		fw_config_file = FW6_CFNAME;
		break;
	default:
		dev_err(adapter->pdev_dev, "Device %d is not supported\n",
		       adapter->pdev->device);
		ret = -EINVAL;
		goto bye;
	}

	ret = request_firmware(&cf, fw_config_file, adapter->pdev_dev);
	if (ret < 0) {
		config_name = "On FLASH";
		mtype = FW_MEMTYPE_CF_FLASH;
		maddr = t4_flash_cfg_addr(adapter);
	} else {
		u32 params[7], val[7];

		sprintf(fw_config_file_path,
			"/lib/firmware/%s", fw_config_file);
		config_name = fw_config_file_path;

		if (cf->size >= FLASH_CFG_MAX_SIZE)
			ret = -ENOMEM;
		else {
			params[0] = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DEV) |
			     FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_DEV_CF));
			ret = t4_query_params(adapter, adapter->mbox,
					      adapter->pf, 0, 1, params, val);
			if (ret == 0) {
				/*
				 * For t4_memory_rw() below addresses and
				 * sizes have to be in terms of multiples of 4
				 * bytes.  So, if the Configuration File isn't
				 * a multiple of 4 bytes in length we'll have
				 * to write that out separately since we can't
				 * guarantee that the bytes following the
				 * residual byte in the buffer returned by
				 * request_firmware() are zeroed out ...
				 */
				size_t resid = cf->size & 0x3;
				size_t size = cf->size & ~0x3;
				__be32 *data = (__be32 *)cf->data;

				mtype = FW_PARAMS_PARAM_Y_G(val[0]);
				maddr = FW_PARAMS_PARAM_Z_G(val[0]) << 16;

				spin_lock(&adapter->win0_lock);
				ret = t4_memory_rw(adapter, 0, mtype, maddr,
						   size, data, T4_MEMORY_WRITE);
				if (ret == 0 && resid != 0) {
					union {
						__be32 word;
						char buf[4];
					} last;
					int i;

					last.word = data[size >> 2];
					for (i = resid; i < 4; i++)
						last.buf[i] = 0;
					ret = t4_memory_rw(adapter, 0, mtype,
							   maddr + size,
							   4, &last.word,
							   T4_MEMORY_WRITE);
				}
				spin_unlock(&adapter->win0_lock);
			}
		}

		release_firmware(cf);
		if (ret)
			goto bye;
	}

	/*
	 * Issue a Capability Configuration command to the firmware to get it
	 * to parse the Configuration File.  We don't use t4_fw_config_file()
	 * because we want the ability to modify various features after we've
	 * processed the configuration file ...
	 */
	memset(&caps_cmd, 0, sizeof(caps_cmd));
	caps_cmd.op_to_write =
		htonl(FW_CMD_OP_V(FW_CAPS_CONFIG_CMD) |
		      FW_CMD_REQUEST_F |
		      FW_CMD_READ_F);
	caps_cmd.cfvalid_to_len16 =
		htonl(FW_CAPS_CONFIG_CMD_CFVALID_F |
		      FW_CAPS_CONFIG_CMD_MEMTYPE_CF_V(mtype) |
		      FW_CAPS_CONFIG_CMD_MEMADDR64K_CF_V(maddr >> 16) |
		      FW_LEN16(caps_cmd));
	ret = t4_wr_mbox(adapter, adapter->mbox, &caps_cmd, sizeof(caps_cmd),
			 &caps_cmd);

	/* If the CAPS_CONFIG failed with an ENOENT (for a Firmware
	 * Configuration File in FLASH), our last gasp effort is to use the
	 * Firmware Configuration File which is embedded in the firmware.  A
	 * very few early versions of the firmware didn't have one embedded
	 * but we can ignore those.
	 */
	if (ret == -ENOENT) {
		memset(&caps_cmd, 0, sizeof(caps_cmd));
		caps_cmd.op_to_write =
			htonl(FW_CMD_OP_V(FW_CAPS_CONFIG_CMD) |
					FW_CMD_REQUEST_F |
					FW_CMD_READ_F);
		caps_cmd.cfvalid_to_len16 = htonl(FW_LEN16(caps_cmd));
		ret = t4_wr_mbox(adapter, adapter->mbox, &caps_cmd,
				sizeof(caps_cmd), &caps_cmd);
		config_name = "Firmware Default";
	}

	config_issued = 1;
	if (ret < 0)
		goto bye;

	finiver = ntohl(caps_cmd.finiver);
	finicsum = ntohl(caps_cmd.finicsum);
	cfcsum = ntohl(caps_cmd.cfcsum);
	if (finicsum != cfcsum)
		dev_warn(adapter->pdev_dev, "Configuration File checksum "\
			 "mismatch: [fini] csum=%#x, computed csum=%#x\n",
			 finicsum, cfcsum);

	/*
	 * And now tell the firmware to use the configuration we just loaded.
	 */
	caps_cmd.op_to_write =
		htonl(FW_CMD_OP_V(FW_CAPS_CONFIG_CMD) |
		      FW_CMD_REQUEST_F |
		      FW_CMD_WRITE_F);
	caps_cmd.cfvalid_to_len16 = htonl(FW_LEN16(caps_cmd));
	ret = t4_wr_mbox(adapter, adapter->mbox, &caps_cmd, sizeof(caps_cmd),
			 NULL);
	if (ret < 0)
		goto bye;

	/*
	 * Tweak configuration based on system architecture, module
	 * parameters, etc.
	 */
	ret = adap_init0_tweaks(adapter);
	if (ret < 0)
		goto bye;

	/*
	 * And finally tell the firmware to initialize itself using the
	 * parameters from the Configuration File.
	 */
	ret = t4_fw_initialize(adapter, adapter->mbox);
	if (ret < 0)
		goto bye;

	/* Emit Firmware Configuration File information and return
	 * successfully.
	 */
	dev_info(adapter->pdev_dev, "Successfully configured using Firmware "\
		 "Configuration File \"%s\", version %#x, computed checksum %#x\n",
		 config_name, finiver, cfcsum);
	return 0;

	/*
	 * Something bad happened.  Return the error ...  (If the "error"
	 * is that there's no Configuration File on the adapter we don't
	 * want to issue a warning since this is fairly common.)
	 */
bye:
	if (config_issued && ret != -ENOENT)
		dev_warn(adapter->pdev_dev, "\"%s\" configuration file error %d\n",
			 config_name, -ret);
	return ret;
}

static struct fw_info fw_info_array[] = {
	{
		.chip = CHELSIO_T4,
		.fs_name = FW4_CFNAME,
		.fw_mod_name = FW4_FNAME,
		.fw_hdr = {
			.chip = FW_HDR_CHIP_T4,
			.fw_ver = __cpu_to_be32(FW_VERSION(T4)),
			.intfver_nic = FW_INTFVER(T4, NIC),
			.intfver_vnic = FW_INTFVER(T4, VNIC),
			.intfver_ri = FW_INTFVER(T4, RI),
			.intfver_iscsi = FW_INTFVER(T4, ISCSI),
			.intfver_fcoe = FW_INTFVER(T4, FCOE),
		},
	}, {
		.chip = CHELSIO_T5,
		.fs_name = FW5_CFNAME,
		.fw_mod_name = FW5_FNAME,
		.fw_hdr = {
			.chip = FW_HDR_CHIP_T5,
			.fw_ver = __cpu_to_be32(FW_VERSION(T5)),
			.intfver_nic = FW_INTFVER(T5, NIC),
			.intfver_vnic = FW_INTFVER(T5, VNIC),
			.intfver_ri = FW_INTFVER(T5, RI),
			.intfver_iscsi = FW_INTFVER(T5, ISCSI),
			.intfver_fcoe = FW_INTFVER(T5, FCOE),
		},
	}, {
		.chip = CHELSIO_T6,
		.fs_name = FW6_CFNAME,
		.fw_mod_name = FW6_FNAME,
		.fw_hdr = {
			.chip = FW_HDR_CHIP_T6,
			.fw_ver = __cpu_to_be32(FW_VERSION(T6)),
			.intfver_nic = FW_INTFVER(T6, NIC),
			.intfver_vnic = FW_INTFVER(T6, VNIC),
			.intfver_ofld = FW_INTFVER(T6, OFLD),
			.intfver_ri = FW_INTFVER(T6, RI),
			.intfver_iscsipdu = FW_INTFVER(T6, ISCSIPDU),
			.intfver_iscsi = FW_INTFVER(T6, ISCSI),
			.intfver_fcoepdu = FW_INTFVER(T6, FCOEPDU),
			.intfver_fcoe = FW_INTFVER(T6, FCOE),
		},
	}

};

static struct fw_info *find_fw_info(int chip)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(fw_info_array); i++) {
		if (fw_info_array[i].chip == chip)
			return &fw_info_array[i];
	}
	return NULL;
}

/*
 * Phase 0 of initialization: contact FW, obtain config, perform basic init.
 */
static int adap_init0(struct adapter *adap)
{
	int ret;
	u32 v, port_vec;
	enum dev_state state;
	u32 params[7], val[7];
	struct fw_caps_config_cmd caps_cmd;
	int reset = 1;

	/* Grab Firmware Device Log parameters as early as possible so we have
	 * access to it for debugging, etc.
	 */
	ret = t4_init_devlog_params(adap);
	if (ret < 0)
		return ret;

	/* Contact FW, advertising Master capability */
	ret = t4_fw_hello(adap, adap->mbox, adap->mbox, MASTER_MAY, &state);
	if (ret < 0) {
		dev_err(adap->pdev_dev, "could not connect to FW, error %d\n",
			ret);
		return ret;
	}
	if (ret == adap->mbox)
		adap->flags |= MASTER_PF;

	/*
	 * If we're the Master PF Driver and the device is uninitialized,
	 * then let's consider upgrading the firmware ...  (We always want
	 * to check the firmware version number in order to A. get it for
	 * later reporting and B. to warn if the currently loaded firmware
	 * is excessively mismatched relative to the driver.)
	 */
	t4_get_fw_version(adap, &adap->params.fw_vers);
	t4_get_tp_version(adap, &adap->params.tp_vers);
	ret = t4_check_fw_version(adap);
	/* If firmware is too old (not supported by driver) force an update. */
	if (ret)
		state = DEV_STATE_UNINIT;
	if ((adap->flags & MASTER_PF) && state != DEV_STATE_INIT) {
		struct fw_info *fw_info;
		struct fw_hdr *card_fw;
		const struct firmware *fw;
		const u8 *fw_data = NULL;
		unsigned int fw_size = 0;

		/* This is the firmware whose headers the driver was compiled
		 * against
		 */
		fw_info = find_fw_info(CHELSIO_CHIP_VERSION(adap->params.chip));
		if (fw_info == NULL) {
			dev_err(adap->pdev_dev,
				"unable to get firmware info for chip %d.\n",
				CHELSIO_CHIP_VERSION(adap->params.chip));
			return -EINVAL;
		}

		/* allocate memory to read the header of the firmware on the
		 * card
		 */
		card_fw = t4_alloc_mem(sizeof(*card_fw));

		/* Get FW from from /lib/firmware/ */
		ret = request_firmware(&fw, fw_info->fw_mod_name,
				       adap->pdev_dev);
		if (ret < 0) {
			dev_err(adap->pdev_dev,
				"unable to load firmware image %s, error %d\n",
				fw_info->fw_mod_name, ret);
		} else {
			fw_data = fw->data;
			fw_size = fw->size;
		}

		/* upgrade FW logic */
		ret = t4_prep_fw(adap, fw_info, fw_data, fw_size, card_fw,
				 state, &reset);

		/* Cleaning up */
		release_firmware(fw);
		t4_free_mem(card_fw);

		if (ret < 0)
			goto bye;
	}

	/*
	 * Grab VPD parameters.  This should be done after we establish a
	 * connection to the firmware since some of the VPD parameters
	 * (notably the Core Clock frequency) are retrieved via requests to
	 * the firmware.  On the other hand, we need these fairly early on
	 * so we do this right after getting ahold of the firmware.
	 */
	ret = t4_get_vpd_params(adap, &adap->params.vpd);
	if (ret < 0)
		goto bye;

	/*
	 * Find out what ports are available to us.  Note that we need to do
	 * this before calling adap_init0_no_config() since it needs nports
	 * and portvec ...
	 */
	v =
	    FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DEV) |
	    FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_DEV_PORTVEC);
	ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 1, &v, &port_vec);
	if (ret < 0)
		goto bye;

	adap->params.nports = hweight32(port_vec);
	adap->params.portvec = port_vec;

	/* If the firmware is initialized already, emit a simply note to that
	 * effect. Otherwise, it's time to try initializing the adapter.
	 */
	if (state == DEV_STATE_INIT) {
		dev_info(adap->pdev_dev, "Coming up as %s: "\
			 "Adapter already initialized\n",
			 adap->flags & MASTER_PF ? "MASTER" : "SLAVE");
	} else {
		dev_info(adap->pdev_dev, "Coming up as MASTER: "\
			 "Initializing adapter\n");

		/* Find out whether we're dealing with a version of the
		 * firmware which has configuration file support.
		 */
		params[0] = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DEV) |
			     FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_DEV_CF));
		ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 1,
				      params, val);

		/* If the firmware doesn't support Configuration Files,
		 * return an error.
		 */
		if (ret < 0) {
			dev_err(adap->pdev_dev, "firmware doesn't support "
				"Firmware Configuration Files\n");
			goto bye;
		}

		/* The firmware provides us with a memory buffer where we can
		 * load a Configuration File from the host if we want to
		 * override the Configuration File in flash.
		 */
		ret = adap_init0_config(adap, reset);
		if (ret == -ENOENT) {
			dev_err(adap->pdev_dev, "no Configuration File "
				"present on adapter.\n");
			goto bye;
		}
		if (ret < 0) {
			dev_err(adap->pdev_dev, "could not initialize "
				"adapter, error %d\n", -ret);
			goto bye;
		}
	}

	/* Give the SGE code a chance to pull in anything that it needs ...
	 * Note that this must be called after we retrieve our VPD parameters
	 * in order to know how to convert core ticks to seconds, etc.
	 */
	ret = t4_sge_init(adap);
	if (ret < 0)
		goto bye;

	if (is_bypass_device(adap->pdev->device))
		adap->params.bypass = 1;

	/*
	 * Grab some of our basic fundamental operating parameters.
	 */
#define FW_PARAM_DEV(param) \
	(FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DEV) | \
	FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_DEV_##param))

#define FW_PARAM_PFVF(param) \
	FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_PFVF) | \
	FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_PFVF_##param)|  \
	FW_PARAMS_PARAM_Y_V(0) | \
	FW_PARAMS_PARAM_Z_V(0)

	params[0] = FW_PARAM_PFVF(EQ_START);
	params[1] = FW_PARAM_PFVF(L2T_START);
	params[2] = FW_PARAM_PFVF(L2T_END);
	params[3] = FW_PARAM_PFVF(FILTER_START);
	params[4] = FW_PARAM_PFVF(FILTER_END);
	params[5] = FW_PARAM_PFVF(IQFLINT_START);
	ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 6, params, val);
	if (ret < 0)
		goto bye;
	adap->sge.egr_start = val[0];
	adap->l2t_start = val[1];
	adap->l2t_end = val[2];
	adap->tids.ftid_base = val[3];
	adap->tids.nftids = val[4] - val[3] + 1;
	adap->sge.ingr_start = val[5];

	/* qids (ingress/egress) returned from firmware can be anywhere
	 * in the range from EQ(IQFLINT)_START to EQ(IQFLINT)_END.
	 * Hence driver needs to allocate memory for this range to
	 * store the queue info. Get the highest IQFLINT/EQ index returned
	 * in FW_EQ_*_CMD.alloc command.
	 */
	params[0] = FW_PARAM_PFVF(EQ_END);
	params[1] = FW_PARAM_PFVF(IQFLINT_END);
	ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 2, params, val);
	if (ret < 0)
		goto bye;
	adap->sge.egr_sz = val[0] - adap->sge.egr_start + 1;
	adap->sge.ingr_sz = val[1] - adap->sge.ingr_start + 1;

	adap->sge.egr_map = kcalloc(adap->sge.egr_sz,
				    sizeof(*adap->sge.egr_map), GFP_KERNEL);
	if (!adap->sge.egr_map) {
		ret = -ENOMEM;
		goto bye;
	}

	adap->sge.ingr_map = kcalloc(adap->sge.ingr_sz,
				     sizeof(*adap->sge.ingr_map), GFP_KERNEL);
	if (!adap->sge.ingr_map) {
		ret = -ENOMEM;
		goto bye;
	}

	/* Allocate the memory for the vaious egress queue bitmaps
	 * ie starving_fl, txq_maperr and blocked_fl.
	 */
	adap->sge.starving_fl =	kcalloc(BITS_TO_LONGS(adap->sge.egr_sz),
					sizeof(long), GFP_KERNEL);
	if (!adap->sge.starving_fl) {
		ret = -ENOMEM;
		goto bye;
	}

	adap->sge.txq_maperr = kcalloc(BITS_TO_LONGS(adap->sge.egr_sz),
				       sizeof(long), GFP_KERNEL);
	if (!adap->sge.txq_maperr) {
		ret = -ENOMEM;
		goto bye;
	}

#ifdef CONFIG_DEBUG_FS
	adap->sge.blocked_fl = kcalloc(BITS_TO_LONGS(adap->sge.egr_sz),
				       sizeof(long), GFP_KERNEL);
	if (!adap->sge.blocked_fl) {
		ret = -ENOMEM;
		goto bye;
	}
#endif

	params[0] = FW_PARAM_PFVF(CLIP_START);
	params[1] = FW_PARAM_PFVF(CLIP_END);
	ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 2, params, val);
	if (ret < 0)
		goto bye;
	adap->clipt_start = val[0];
	adap->clipt_end = val[1];

	/* query params related to active filter region */
	params[0] = FW_PARAM_PFVF(ACTIVE_FILTER_START);
	params[1] = FW_PARAM_PFVF(ACTIVE_FILTER_END);
	ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 2, params, val);
	/* If Active filter size is set we enable establishing
	 * offload connection through firmware work request
	 */
	if ((val[0] != val[1]) && (ret >= 0)) {
		adap->flags |= FW_OFLD_CONN;
		adap->tids.aftid_base = val[0];
		adap->tids.aftid_end = val[1];
	}

	/* If we're running on newer firmware, let it know that we're
	 * prepared to deal with encapsulated CPL messages.  Older
	 * firmware won't understand this and we'll just get
	 * unencapsulated messages ...
	 */
	params[0] = FW_PARAM_PFVF(CPLFW4MSG_ENCAP);
	val[0] = 1;
	(void)t4_set_params(adap, adap->mbox, adap->pf, 0, 1, params, val);

	/*
	 * Find out whether we're allowed to use the T5+ ULPTX MEMWRITE DSGL
	 * capability.  Earlier versions of the firmware didn't have the
	 * ULPTX_MEMWRITE_DSGL so we'll interpret a query failure as no
	 * permission to use ULPTX MEMWRITE DSGL.
	 */
	if (is_t4(adap->params.chip)) {
		adap->params.ulptx_memwrite_dsgl = false;
	} else {
		params[0] = FW_PARAM_DEV(ULPTX_MEMWRITE_DSGL);
		ret = t4_query_params(adap, adap->mbox, adap->pf, 0,
				      1, params, val);
		adap->params.ulptx_memwrite_dsgl = (ret == 0 && val[0] != 0);
	}

	/*
	 * Get device capabilities so we can determine what resources we need
	 * to manage.
	 */
	memset(&caps_cmd, 0, sizeof(caps_cmd));
	caps_cmd.op_to_write = htonl(FW_CMD_OP_V(FW_CAPS_CONFIG_CMD) |
				     FW_CMD_REQUEST_F | FW_CMD_READ_F);
	caps_cmd.cfvalid_to_len16 = htonl(FW_LEN16(caps_cmd));
	ret = t4_wr_mbox(adap, adap->mbox, &caps_cmd, sizeof(caps_cmd),
			 &caps_cmd);
	if (ret < 0)
		goto bye;

	if (caps_cmd.ofldcaps) {
		/* query offload-related parameters */
		params[0] = FW_PARAM_DEV(NTID);
		params[1] = FW_PARAM_PFVF(SERVER_START);
		params[2] = FW_PARAM_PFVF(SERVER_END);
		params[3] = FW_PARAM_PFVF(TDDP_START);
		params[4] = FW_PARAM_PFVF(TDDP_END);
		params[5] = FW_PARAM_DEV(FLOWC_BUFFIFO_SZ);
		ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 6,
				      params, val);
		if (ret < 0)
			goto bye;
		adap->tids.ntids = val[0];
		adap->tids.natids = min(adap->tids.ntids / 2, MAX_ATIDS);
		adap->tids.stid_base = val[1];
		adap->tids.nstids = val[2] - val[1] + 1;
		/*
		 * Setup server filter region. Divide the available filter
		 * region into two parts. Regular filters get 1/3rd and server
		 * filters get 2/3rd part. This is only enabled if workarond
		 * path is enabled.
		 * 1. For regular filters.
		 * 2. Server filter: This are special filters which are used
		 * to redirect SYN packets to offload queue.
		 */
		if (adap->flags & FW_OFLD_CONN && !is_bypass(adap)) {
			adap->tids.sftid_base = adap->tids.ftid_base +
					DIV_ROUND_UP(adap->tids.nftids, 3);
			adap->tids.nsftids = adap->tids.nftids -
					 DIV_ROUND_UP(adap->tids.nftids, 3);
			adap->tids.nftids = adap->tids.sftid_base -
						adap->tids.ftid_base;
		}
		adap->vres.ddp.start = val[3];
		adap->vres.ddp.size = val[4] - val[3] + 1;
		adap->params.ofldq_wr_cred = val[5];

		adap->params.offload = 1;
	}
	if (caps_cmd.rdmacaps) {
		params[0] = FW_PARAM_PFVF(STAG_START);
		params[1] = FW_PARAM_PFVF(STAG_END);
		params[2] = FW_PARAM_PFVF(RQ_START);
		params[3] = FW_PARAM_PFVF(RQ_END);
		params[4] = FW_PARAM_PFVF(PBL_START);
		params[5] = FW_PARAM_PFVF(PBL_END);
		ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 6,
				      params, val);
		if (ret < 0)
			goto bye;
		adap->vres.stag.start = val[0];
		adap->vres.stag.size = val[1] - val[0] + 1;
		adap->vres.rq.start = val[2];
		adap->vres.rq.size = val[3] - val[2] + 1;
		adap->vres.pbl.start = val[4];
		adap->vres.pbl.size = val[5] - val[4] + 1;

		params[0] = FW_PARAM_PFVF(SQRQ_START);
		params[1] = FW_PARAM_PFVF(SQRQ_END);
		params[2] = FW_PARAM_PFVF(CQ_START);
		params[3] = FW_PARAM_PFVF(CQ_END);
		params[4] = FW_PARAM_PFVF(OCQ_START);
		params[5] = FW_PARAM_PFVF(OCQ_END);
		ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 6, params,
				      val);
		if (ret < 0)
			goto bye;
		adap->vres.qp.start = val[0];
		adap->vres.qp.size = val[1] - val[0] + 1;
		adap->vres.cq.start = val[2];
		adap->vres.cq.size = val[3] - val[2] + 1;
		adap->vres.ocq.start = val[4];
		adap->vres.ocq.size = val[5] - val[4] + 1;

		params[0] = FW_PARAM_DEV(MAXORDIRD_QP);
		params[1] = FW_PARAM_DEV(MAXIRD_ADAPTER);
		ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 2, params,
				      val);
		if (ret < 0) {
			adap->params.max_ordird_qp = 8;
			adap->params.max_ird_adapter = 32 * adap->tids.ntids;
			ret = 0;
		} else {
			adap->params.max_ordird_qp = val[0];
			adap->params.max_ird_adapter = val[1];
		}
		dev_info(adap->pdev_dev,
			 "max_ordird_qp %d max_ird_adapter %d\n",
			 adap->params.max_ordird_qp,
			 adap->params.max_ird_adapter);
	}
	if (caps_cmd.iscsicaps) {
		params[0] = FW_PARAM_PFVF(ISCSI_START);
		params[1] = FW_PARAM_PFVF(ISCSI_END);
		ret = t4_query_params(adap, adap->mbox, adap->pf, 0, 2,
				      params, val);
		if (ret < 0)
			goto bye;
		adap->vres.iscsi.start = val[0];
		adap->vres.iscsi.size = val[1] - val[0] + 1;
	}
#undef FW_PARAM_PFVF
#undef FW_PARAM_DEV

	/* The MTU/MSS Table is initialized by now, so load their values.  If
	 * we're initializing the adapter, then we'll make any modifications
	 * we want to the MTU/MSS Table and also initialize the congestion
	 * parameters.
	 */
	t4_read_mtu_tbl(adap, adap->params.mtus, NULL);
	if (state != DEV_STATE_INIT) {
		int i;

		/* The default MTU Table contains values 1492 and 1500.
		 * However, for TCP, it's better to have two values which are
		 * a multiple of 8 +/- 4 bytes apart near this popular MTU.
		 * This allows us to have a TCP Data Payload which is a
		 * multiple of 8 regardless of what combination of TCP Options
		 * are in use (always a multiple of 4 bytes) which is
		 * important for performance reasons.  For instance, if no
		 * options are in use, then we have a 20-byte IP header and a
		 * 20-byte TCP header.  In this case, a 1500-byte MSS would
		 * result in a TCP Data Payload of 1500 - 40 == 1460 bytes
		 * which is not a multiple of 8.  So using an MSS of 1488 in
		 * this case results in a TCP Data Payload of 1448 bytes which
		 * is a multiple of 8.  On the other hand, if 12-byte TCP Time
		 * Stamps have been negotiated, then an MTU of 1500 bytes
		 * results in a TCP Data Payload of 1448 bytes which, as
		 * above, is a multiple of 8 bytes ...
		 */
		for (i = 0; i < NMTUS; i++)
			if (adap->params.mtus[i] == 1492) {
				adap->params.mtus[i] = 1488;
				break;
			}

		t4_load_mtus(adap, adap->params.mtus, adap->params.a_wnd,
			     adap->params.b_wnd);
	}
	t4_init_sge_params(adap);
	adap->flags |= FW_OK;
	t4_init_tp_params(adap);
	return 0;

	/*
	 * Something bad happened.  If a command timed out or failed with EIO
	 * FW does not operate within its spec or something catastrophic
	 * happened to HW/FW, stop issuing commands.
	 */
bye:
	kfree(adap->sge.egr_map);
	kfree(adap->sge.ingr_map);
	kfree(adap->sge.starving_fl);
	kfree(adap->sge.txq_maperr);
#ifdef CONFIG_DEBUG_FS
	kfree(adap->sge.blocked_fl);
#endif
	if (ret != -ETIMEDOUT && ret != -EIO)
		t4_fw_bye(adap, adap->mbox);
	return ret;
}

/* EEH callbacks */

static pci_ers_result_t eeh_err_detected(struct pci_dev *pdev,
					 pci_channel_state_t state)
{
	int i;
	struct adapter *adap = pci_get_drvdata(pdev);

	if (!adap)
		goto out;

	rtnl_lock();
	adap->flags &= ~FW_OK;
	notify_ulds(adap, CXGB4_STATE_START_RECOVERY);
	spin_lock(&adap->stats_lock);
	for_each_port(adap, i) {
		struct net_device *dev = adap->port[i];

		netif_device_detach(dev);
		netif_carrier_off(dev);
	}
	spin_unlock(&adap->stats_lock);
	disable_interrupts(adap);
	if (adap->flags & FULL_INIT_DONE)
		cxgb_down(adap);
	rtnl_unlock();
	if ((adap->flags & DEV_ENABLED)) {
		pci_disable_device(pdev);
		adap->flags &= ~DEV_ENABLED;
	}
out:	return state == pci_channel_io_perm_failure ?
		PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_NEED_RESET;
}

static pci_ers_result_t eeh_slot_reset(struct pci_dev *pdev)
{
	int i, ret;
	struct fw_caps_config_cmd c;
	struct adapter *adap = pci_get_drvdata(pdev);

	if (!adap) {
		pci_restore_state(pdev);
		pci_save_state(pdev);
		return PCI_ERS_RESULT_RECOVERED;
	}

	if (!(adap->flags & DEV_ENABLED)) {
		if (pci_enable_device(pdev)) {
			dev_err(&pdev->dev, "Cannot reenable PCI "
					    "device after reset\n");
			return PCI_ERS_RESULT_DISCONNECT;
		}
		adap->flags |= DEV_ENABLED;
	}

	pci_set_master(pdev);
	pci_restore_state(pdev);
	pci_save_state(pdev);
	pci_cleanup_aer_uncorrect_error_status(pdev);

	if (t4_wait_dev_ready(adap->regs) < 0)
		return PCI_ERS_RESULT_DISCONNECT;
	if (t4_fw_hello(adap, adap->mbox, adap->pf, MASTER_MUST, NULL) < 0)
		return PCI_ERS_RESULT_DISCONNECT;
	adap->flags |= FW_OK;
	if (adap_init1(adap, &c))
		return PCI_ERS_RESULT_DISCONNECT;

	for_each_port(adap, i) {
		struct port_info *p = adap2pinfo(adap, i);

		ret = t4_alloc_vi(adap, adap->mbox, p->tx_chan, adap->pf, 0, 1,
				  NULL, NULL);
		if (ret < 0)
			return PCI_ERS_RESULT_DISCONNECT;
		p->viid = ret;
		p->xact_addr_filt = -1;
	}

	t4_load_mtus(adap, adap->params.mtus, adap->params.a_wnd,
		     adap->params.b_wnd);
	setup_memwin(adap);
	if (cxgb_up(adap))
		return PCI_ERS_RESULT_DISCONNECT;
	return PCI_ERS_RESULT_RECOVERED;
}

static void eeh_resume(struct pci_dev *pdev)
{
	int i;
	struct adapter *adap = pci_get_drvdata(pdev);

	if (!adap)
		return;

	rtnl_lock();
	for_each_port(adap, i) {
		struct net_device *dev = adap->port[i];

		if (netif_running(dev)) {
			link_start(dev);
			cxgb_set_rxmode(dev);
		}
		netif_device_attach(dev);
	}
	rtnl_unlock();
}

static const struct pci_error_handlers cxgb4_eeh = {
	.error_detected = eeh_err_detected,
	.slot_reset     = eeh_slot_reset,
	.resume         = eeh_resume,
};

static inline bool is_x_10g_port(const struct link_config *lc)
{
	return (lc->supported & FW_PORT_CAP_SPEED_10G) != 0 ||
	       (lc->supported & FW_PORT_CAP_SPEED_40G) != 0;
}

static inline void init_rspq(struct adapter *adap, struct sge_rspq *q,
			     unsigned int us, unsigned int cnt,
			     unsigned int size, unsigned int iqe_size)
{
	q->adap = adap;
	cxgb4_set_rspq_intr_params(q, us, cnt);
	q->iqe_len = iqe_size;
	q->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 prior to actual use.
 */
static void cfg_queues(struct adapter *adap)
{
	struct sge *s = &adap->sge;
	int i, n10g = 0, qidx = 0;
#ifndef CONFIG_CHELSIO_T4_DCB
	int q10g = 0;
#endif
	int ciq_size;

	for_each_port(adap, i)
		n10g += is_x_10g_port(&adap2pinfo(adap, i)->link_cfg);
#ifdef CONFIG_CHELSIO_T4_DCB
	/* For Data Center Bridging support we need to be able to support up
	 * to 8 Traffic Priorities; each of which will be assigned to its
	 * own TX Queue in order to prevent Head-Of-Line Blocking.
	 */
	if (adap->params.nports * 8 > MAX_ETH_QSETS) {
		dev_err(adap->pdev_dev, "MAX_ETH_QSETS=%d < %d!\n",
			MAX_ETH_QSETS, adap->params.nports * 8);
		BUG_ON(1);
	}

	for_each_port(adap, i) {
		struct port_info *pi = adap2pinfo(adap, i);

		pi->first_qset = qidx;
		pi->nqsets = 8;
		qidx += pi->nqsets;
	}
#else /* !CONFIG_CHELSIO_T4_DCB */
	/*
	 * We default to 1 queue per non-10G port and up to # of cores queues
	 * per 10G port.
	 */
	if (n10g)
		q10g = (MAX_ETH_QSETS - (adap->params.nports - n10g)) / n10g;
	if (q10g > netif_get_num_default_rss_queues())
		q10g = netif_get_num_default_rss_queues();

	for_each_port(adap, i) {
		struct port_info *pi = adap2pinfo(adap, i);

		pi->first_qset = qidx;
		pi->nqsets = is_x_10g_port(&pi->link_cfg) ? q10g : 1;
		qidx += pi->nqsets;
	}
#endif /* !CONFIG_CHELSIO_T4_DCB */

	s->ethqsets = qidx;
	s->max_ethqsets = qidx;   /* MSI-X may lower it later */

	if (is_offload(adap)) {
		/*
		 * For offload we use 1 queue/channel if all ports are up to 1G,
		 * otherwise we divide all available queues amongst the channels
		 * capped by the number of available cores.
		 */
		if (n10g) {
			i = min_t(int, ARRAY_SIZE(s->iscsirxq),
				  num_online_cpus());
			s->iscsiqsets = roundup(i, adap->params.nports);
		} else
			s->iscsiqsets = adap->params.nports;
		/* For RDMA one Rx queue per channel suffices */
		s->rdmaqs = adap->params.nports;
		/* Try and allow at least 1 CIQ per cpu rounding down
		 * to the number of ports, with a minimum of 1 per port.
		 * A 2 port card in a 6 cpu system: 6 CIQs, 3 / port.
		 * A 4 port card in a 6 cpu system: 4 CIQs, 1 / port.
		 * A 4 port card in a 2 cpu system: 4 CIQs, 1 / port.
		 */
		s->rdmaciqs = min_t(int, MAX_RDMA_CIQS, num_online_cpus());
		s->rdmaciqs = (s->rdmaciqs / adap->params.nports) *
				adap->params.nports;
		s->rdmaciqs = max_t(int, s->rdmaciqs, adap->params.nports);
	}

	for (i = 0; i < ARRAY_SIZE(s->ethrxq); i++) {
		struct sge_eth_rxq *r = &s->ethrxq[i];

		init_rspq(adap, &r->rspq, 5, 10, 1024, 64);
		r->fl.size = 72;
	}

	for (i = 0; i < ARRAY_SIZE(s->ethtxq); i++)
		s->ethtxq[i].q.size = 1024;

	for (i = 0; i < ARRAY_SIZE(s->ctrlq); i++)
		s->ctrlq[i].q.size = 512;

	for (i = 0; i < ARRAY_SIZE(s->ofldtxq); i++)
		s->ofldtxq[i].q.size = 1024;

	for (i = 0; i < ARRAY_SIZE(s->iscsirxq); i++) {
		struct sge_ofld_rxq *r = &s->iscsirxq[i];

		init_rspq(adap, &r->rspq, 5, 1, 1024, 64);
		r->rspq.uld = CXGB4_ULD_ISCSI;
		r->fl.size = 72;
	}

	for (i = 0; i < ARRAY_SIZE(s->rdmarxq); i++) {
		struct sge_ofld_rxq *r = &s->rdmarxq[i];

		init_rspq(adap, &r->rspq, 5, 1, 511, 64);
		r->rspq.uld = CXGB4_ULD_RDMA;
		r->fl.size = 72;
	}

	ciq_size = 64 + adap->vres.cq.size + adap->tids.nftids;
	if (ciq_size > SGE_MAX_IQ_SIZE) {
		CH_WARN(adap, "CIQ size too small for available IQs\n");
		ciq_size = SGE_MAX_IQ_SIZE;
	}

	for (i = 0; i < ARRAY_SIZE(s->rdmaciq); i++) {
		struct sge_ofld_rxq *r = &s->rdmaciq[i];

		init_rspq(adap, &r->rspq, 5, 1, ciq_size, 64);
		r->rspq.uld = CXGB4_ULD_RDMA;
	}

	init_rspq(adap, &s->fw_evtq, 0, 1, 1024, 64);
	init_rspq(adap, &s->intrq, 0, 1, 2 * MAX_INGQ, 64);
}

/*
 * Reduce the number of Ethernet queues across all ports to at most n.
 * n provides at least one queue per port.
 */
static void reduce_ethqs(struct adapter *adap, int n)
{
	int i;
	struct port_info *pi;

	while (n < adap->sge.ethqsets)
		for_each_port(adap, i) {
			pi = adap2pinfo(adap, i);
			if (pi->nqsets > 1) {
				pi->nqsets--;
				adap->sge.ethqsets--;
				if (adap->sge.ethqsets <= n)
					break;
			}
		}

	n = 0;
	for_each_port(adap, i) {
		pi = adap2pinfo(adap, i);
		pi->first_qset = n;
		n += pi->nqsets;
	}
}

/* 2 MSI-X vectors needed for the FW queue and non-data interrupts */
#define EXTRA_VECS 2

static int enable_msix(struct adapter *adap)
{
	int ofld_need = 0;
	int i, want, need, allocated;
	struct sge *s = &adap->sge;
	unsigned int nchan = adap->params.nports;
	struct msix_entry *entries;

	entries = kmalloc(sizeof(*entries) * (MAX_INGQ + 1),
			  GFP_KERNEL);
	if (!entries)
		return -ENOMEM;

	for (i = 0; i < MAX_INGQ + 1; ++i)
		entries[i].entry = i;

	want = s->max_ethqsets + EXTRA_VECS;
	if (is_offload(adap)) {
		want += s->rdmaqs + s->rdmaciqs + s->iscsiqsets;
		/* need nchan for each possible ULD */
		ofld_need = 3 * nchan;
	}
#ifdef CONFIG_CHELSIO_T4_DCB
	/* For Data Center Bridging we need 8 Ethernet TX Priority Queues for
	 * each port.
	 */
	need = 8 * adap->params.nports + EXTRA_VECS + ofld_need;
#else
	need = adap->params.nports + EXTRA_VECS + ofld_need;
#endif
	allocated = pci_enable_msix_range(adap->pdev, entries, need, want);
	if (allocated < 0) {
		dev_info(adap->pdev_dev, "not enough MSI-X vectors left,"
			 " not using MSI-X\n");
		kfree(entries);
		return allocated;
	}

	/* Distribute available vectors to the various queue groups.
	 * Every group gets its minimum requirement and NIC gets top
	 * priority for leftovers.
	 */
	i = allocated - EXTRA_VECS - ofld_need;
	if (i < s->max_ethqsets) {
		s->max_ethqsets = i;
		if (i < s->ethqsets)
			reduce_ethqs(adap, i);
	}
	if (is_offload(adap)) {
		if (allocated < want) {
			s->rdmaqs = nchan;
			s->rdmaciqs = nchan;
		}

		/* leftovers go to OFLD */
		i = allocated - EXTRA_VECS - s->max_ethqsets -
		    s->rdmaqs - s->rdmaciqs;
		s->iscsiqsets = (i / nchan) * nchan;  /* round down */
	}
	for (i = 0; i < allocated; ++i)
		adap->msix_info[i].vec = entries[i].vector;
	dev_info(adap->pdev_dev, "%d MSI-X vectors allocated, "
		 "nic %d iscsi %d rdma cpl %d rdma ciq %d\n",
		 allocated, s->max_ethqsets, s->iscsiqsets, s->rdmaqs,
		 s->rdmaciqs);

	kfree(entries);
	return 0;
}

#undef EXTRA_VECS

static int init_rss(struct adapter *adap)
{
	unsigned int i;
	int err;

	err = t4_init_rss_mode(adap, adap->mbox);
	if (err)
		return err;

	for_each_port(adap, i) {
		struct port_info *pi = adap2pinfo(adap, i);

		pi->rss = kcalloc(pi->rss_size, sizeof(u16), GFP_KERNEL);
		if (!pi->rss)
			return -ENOMEM;
	}
	return 0;
}

static int cxgb4_get_pcie_dev_link_caps(struct adapter *adap,
					enum pci_bus_speed *speed,
					enum pcie_link_width *width)
{
	u32 lnkcap1, lnkcap2;
	int err1, err2;

#define  PCIE_MLW_CAP_SHIFT 4   /* start of MLW mask in link capabilities */

	*speed = PCI_SPEED_UNKNOWN;
	*width = PCIE_LNK_WIDTH_UNKNOWN;

	err1 = pcie_capability_read_dword(adap->pdev, PCI_EXP_LNKCAP,
					  &lnkcap1);
	err2 = pcie_capability_read_dword(adap->pdev, PCI_EXP_LNKCAP2,
					  &lnkcap2);
	if (!err2 && lnkcap2) { /* PCIe r3.0-compliant */
		if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
			*speed = PCIE_SPEED_8_0GT;
		else if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
			*speed = PCIE_SPEED_5_0GT;
		else if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
			*speed = PCIE_SPEED_2_5GT;
	}
	if (!err1) {
		*width = (lnkcap1 & PCI_EXP_LNKCAP_MLW) >> PCIE_MLW_CAP_SHIFT;
		if (!lnkcap2) { /* pre-r3.0 */
			if (lnkcap1 & PCI_EXP_LNKCAP_SLS_5_0GB)
				*speed = PCIE_SPEED_5_0GT;
			else if (lnkcap1 & PCI_EXP_LNKCAP_SLS_2_5GB)
				*speed = PCIE_SPEED_2_5GT;
		}
	}

	if (*speed == PCI_SPEED_UNKNOWN || *width == PCIE_LNK_WIDTH_UNKNOWN)
		return err1 ? err1 : err2 ? err2 : -EINVAL;
	return 0;
}

static void cxgb4_check_pcie_caps(struct adapter *adap)
{
	enum pcie_link_width width, width_cap;
	enum pci_bus_speed speed, speed_cap;

#define PCIE_SPEED_STR(speed) \
	(speed == PCIE_SPEED_8_0GT ? "8.0GT/s" : \
	 speed == PCIE_SPEED_5_0GT ? "5.0GT/s" : \
	 speed == PCIE_SPEED_2_5GT ? "2.5GT/s" : \
	 "Unknown")

	if (cxgb4_get_pcie_dev_link_caps(adap, &speed_cap, &width_cap)) {
		dev_warn(adap->pdev_dev,
			 "Unable to determine PCIe device BW capabilities\n");
		return;
	}

	if (pcie_get_minimum_link(adap->pdev, &speed, &width) ||
	    speed == PCI_SPEED_UNKNOWN || width == PCIE_LNK_WIDTH_UNKNOWN) {
		dev_warn(adap->pdev_dev,
			 "Unable to determine PCI Express bandwidth.\n");
		return;
	}

	dev_info(adap->pdev_dev, "PCIe link speed is %s, device supports %s\n",
		 PCIE_SPEED_STR(speed), PCIE_SPEED_STR(speed_cap));
	dev_info(adap->pdev_dev, "PCIe link width is x%d, device supports x%d\n",
		 width, width_cap);
	if (speed < speed_cap || width < width_cap)
		dev_info(adap->pdev_dev,
			 "A slot with more lanes and/or higher speed is "
			 "suggested for optimal performance.\n");
}

static void print_port_info(const struct net_device *dev)
{
	char buf[80];
	char *bufp = buf;
	const char *spd = "";
	const struct port_info *pi = netdev_priv(dev);
	const struct adapter *adap = pi->adapter;

	if (adap->params.pci.speed == PCI_EXP_LNKSTA_CLS_2_5GB)
		spd = " 2.5 GT/s";
	else if (adap->params.pci.speed == PCI_EXP_LNKSTA_CLS_5_0GB)
		spd = " 5 GT/s";
	else if (adap->params.pci.speed == PCI_EXP_LNKSTA_CLS_8_0GB)
		spd = " 8 GT/s";

	if (pi->link_cfg.supported & FW_PORT_CAP_SPEED_100M)
		bufp += sprintf(bufp, "100/");
	if (pi->link_cfg.supported & FW_PORT_CAP_SPEED_1G)
		bufp += sprintf(bufp, "1000/");
	if (pi->link_cfg.supported & FW_PORT_CAP_SPEED_10G)
		bufp += sprintf(bufp, "10G/");
	if (pi->link_cfg.supported & FW_PORT_CAP_SPEED_40G)
		bufp += sprintf(bufp, "40G/");
	if (bufp != buf)
		--bufp;
	sprintf(bufp, "BASE-%s", t4_get_port_type_description(pi->port_type));

	netdev_info(dev, "Chelsio %s rev %d %s %sNIC %s\n",
		    adap->params.vpd.id,
		    CHELSIO_CHIP_RELEASE(adap->params.chip), buf,
		    is_offload(adap) ? "R" : "",
		    (adap->flags & USING_MSIX) ? " MSI-X" :
		    (adap->flags & USING_MSI) ? " MSI" : "");
	netdev_info(dev, "S/N: %s, P/N: %s\n",
		    adap->params.vpd.sn, adap->params.vpd.pn);
}

static void enable_pcie_relaxed_ordering(struct pci_dev *dev)
{
	pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN);
}

/*
 * Free the following resources:
 * - memory used for tables
 * - MSI/MSI-X
 * - net devices
 * - resources FW is holding for us
 */
static void free_some_resources(struct adapter *adapter)
{
	unsigned int i;

	t4_free_mem(adapter->l2t);
	t4_free_mem(adapter->tids.tid_tab);
	kfree(adapter->sge.egr_map);
	kfree(adapter->sge.ingr_map);
	kfree(adapter->sge.starving_fl);
	kfree(adapter->sge.txq_maperr);
#ifdef CONFIG_DEBUG_FS
	kfree(adapter->sge.blocked_fl);
#endif
	disable_msi(adapter);

	for_each_port(adapter, i)
		if (adapter->port[i]) {
			struct port_info *pi = adap2pinfo(adapter, i);

			if (pi->viid != 0)
				t4_free_vi(adapter, adapter->mbox, adapter->pf,
					   0, pi->viid);
			kfree(adap2pinfo(adapter, i)->rss);
			free_netdev(adapter->port[i]);
		}
	if (adapter->flags & FW_OK)
		t4_fw_bye(adapter, adapter->pf);
}

#define TSO_FLAGS (NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_TSO_ECN)
#define VLAN_FEAT (NETIF_F_SG | NETIF_F_IP_CSUM | TSO_FLAGS | \
		   NETIF_F_IPV6_CSUM | NETIF_F_HIGHDMA)
#define SEGMENT_SIZE 128

static int get_chip_type(struct pci_dev *pdev, u32 pl_rev)
{
	u16 device_id;

	/* Retrieve adapter's device ID */
	pci_read_config_word(pdev, PCI_DEVICE_ID, &device_id);

	switch (device_id >> 12) {
	case CHELSIO_T4:
		return CHELSIO_CHIP_CODE(CHELSIO_T4, pl_rev);
	case CHELSIO_T5:
		return CHELSIO_CHIP_CODE(CHELSIO_T5, pl_rev);
	case CHELSIO_T6:
		return CHELSIO_CHIP_CODE(CHELSIO_T6, pl_rev);
	default:
		dev_err(&pdev->dev, "Device %d is not supported\n",
			device_id);
	}
	return -EINVAL;
}

static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	int func, i, err, s_qpp, qpp, num_seg;
	struct port_info *pi;
	bool highdma = false;
	struct adapter *adapter = NULL;
	void __iomem *regs;
	u32 whoami, pl_rev;
	enum chip_type chip;

	printk_once(KERN_INFO "%s - version %s\n", DRV_DESC, DRV_VERSION);

	err = pci_request_regions(pdev, KBUILD_MODNAME);
	if (err) {
		/* Just info, some other driver may have claimed the device. */
		dev_info(&pdev->dev, "cannot obtain PCI resources\n");
		return err;
	}

	err = pci_enable_device(pdev);
	if (err) {
		dev_err(&pdev->dev, "cannot enable PCI device\n");
		goto out_release_regions;
	}

	regs = pci_ioremap_bar(pdev, 0);
	if (!regs) {
		dev_err(&pdev->dev, "cannot map device registers\n");
		err = -ENOMEM;
		goto out_disable_device;
	}

	err = t4_wait_dev_ready(regs);
	if (err < 0)
		goto out_unmap_bar0;

	/* We control everything through one PF */
	whoami = readl(regs + PL_WHOAMI_A);
	pl_rev = REV_G(readl(regs + PL_REV_A));
	chip = get_chip_type(pdev, pl_rev);
	func = CHELSIO_CHIP_VERSION(chip) <= CHELSIO_T5 ?
		SOURCEPF_G(whoami) : T6_SOURCEPF_G(whoami);
	if (func != ent->driver_data) {
		iounmap(regs);
		pci_disable_device(pdev);
		pci_save_state(pdev);        /* to restore SR-IOV later */
		goto sriov;
	}

	if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
		highdma = true;
		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 out_unmap_bar0;
		}
	} else {
		err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
		if (err) {
			dev_err(&pdev->dev, "no usable DMA configuration\n");
			goto out_unmap_bar0;
		}
	}

	pci_enable_pcie_error_reporting(pdev);
	enable_pcie_relaxed_ordering(pdev);
	pci_set_master(pdev);
	pci_save_state(pdev);

	adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
	if (!adapter) {
		err = -ENOMEM;
		goto out_unmap_bar0;
	}

	adapter->workq = create_singlethread_workqueue("cxgb4");
	if (!adapter->workq) {
		err = -ENOMEM;
		goto out_free_adapter;
	}

	/* PCI device has been enabled */
	adapter->flags |= DEV_ENABLED;

	adapter->regs = regs;
	adapter->pdev = pdev;
	adapter->pdev_dev = &pdev->dev;
	adapter->mbox = func;
	adapter->pf = func;
	adapter->msg_enable = dflt_msg_enable;
	memset(adapter->chan_map, 0xff, sizeof(adapter->chan_map));

	spin_lock_init(&adapter->stats_lock);
	spin_lock_init(&adapter->tid_release_lock);
	spin_lock_init(&adapter->win0_lock);

	INIT_WORK(&adapter->tid_release_task, process_tid_release_list);
	INIT_WORK(&adapter->db_full_task, process_db_full);
	INIT_WORK(&adapter->db_drop_task, process_db_drop);

	err = t4_prep_adapter(adapter);
	if (err)
		goto out_free_adapter;


	if (!is_t4(adapter->params.chip)) {
		s_qpp = (QUEUESPERPAGEPF0_S +
			(QUEUESPERPAGEPF1_S - QUEUESPERPAGEPF0_S) *
			adapter->pf);
		qpp = 1 << QUEUESPERPAGEPF0_G(t4_read_reg(adapter,
		      SGE_EGRESS_QUEUES_PER_PAGE_PF_A) >> s_qpp);
		num_seg = PAGE_SIZE / SEGMENT_SIZE;

		/* Each segment size is 128B. Write coalescing is enabled only
		 * when SGE_EGRESS_QUEUES_PER_PAGE_PF reg value for the
		 * queue is less no of segments that can be accommodated in
		 * a page size.
		 */
		if (qpp > num_seg) {
			dev_err(&pdev->dev,
				"Incorrect number of egress queues per page\n");
			err = -EINVAL;
			goto out_free_adapter;
		}
		adapter->bar2 = ioremap_wc(pci_resource_start(pdev, 2),
		pci_resource_len(pdev, 2));
		if (!adapter->bar2) {
			dev_err(&pdev->dev, "cannot map device bar2 region\n");
			err = -ENOMEM;
			goto out_free_adapter;
		}
	}

	setup_memwin(adapter);
	err = adap_init0(adapter);
#ifdef CONFIG_DEBUG_FS
	bitmap_zero(adapter->sge.blocked_fl, adapter->sge.egr_sz);
#endif
	setup_memwin_rdma(adapter);
	if (err)
		goto out_unmap_bar;

	/* configure SGE_STAT_CFG_A to read WC stats */
	if (!is_t4(adapter->params.chip))
		t4_write_reg(adapter, SGE_STAT_CFG_A, STATSOURCE_T5_V(7) |
			     (is_t5(adapter->params.chip) ? STATMODE_V(0) :
			      T6_STATMODE_V(0)));

	for_each_port(adapter, i) {
		struct net_device *netdev;

		netdev = alloc_etherdev_mq(sizeof(struct port_info),
					   MAX_ETH_QSETS);
		if (!netdev) {
			err = -ENOMEM;
			goto out_free_dev;
		}

		SET_NETDEV_DEV(netdev, &pdev->dev);

		adapter->port[i] = netdev;
		pi = netdev_priv(netdev);
		pi->adapter = adapter;
		pi->xact_addr_filt = -1;
		pi->port_id = i;
		netdev->irq = pdev->irq;

		netdev->hw_features = NETIF_F_SG | TSO_FLAGS |
			NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
			NETIF_F_RXCSUM | NETIF_F_RXHASH |
			NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
		if (highdma)
			netdev->hw_features |= NETIF_F_HIGHDMA;
		netdev->features |= netdev->hw_features;
		netdev->vlan_features = netdev->features & VLAN_FEAT;

		netdev->priv_flags |= IFF_UNICAST_FLT;

		netdev->netdev_ops = &cxgb4_netdev_ops;
#ifdef CONFIG_CHELSIO_T4_DCB
		netdev->dcbnl_ops = &cxgb4_dcb_ops;
		cxgb4_dcb_state_init(netdev);
#endif
		cxgb4_set_ethtool_ops(netdev);
	}

	pci_set_drvdata(pdev, adapter);

	if (adapter->flags & FW_OK) {
		err = t4_port_init(adapter, func, func, 0);
		if (err)
			goto out_free_dev;
	} else if (adapter->params.nports == 1) {
		/* If we don't have a connection to the firmware -- possibly
		 * because of an error -- grab the raw VPD parameters so we
		 * can set the proper MAC Address on the debug network
		 * interface that we've created.
		 */
		u8 hw_addr[ETH_ALEN];
		u8 *na = adapter->params.vpd.na;

		err = t4_get_raw_vpd_params(adapter, &adapter->params.vpd);
		if (!err) {
			for (i = 0; i < ETH_ALEN; i++)
				hw_addr[i] = (hex2val(na[2 * i + 0]) * 16 +
					      hex2val(na[2 * i + 1]));
			t4_set_hw_addr(adapter, 0, hw_addr);
		}
	}

	/* Configure queues and allocate tables now, they can be needed as
	 * soon as the first register_netdev completes.
	 */
	cfg_queues(adapter);

	adapter->l2t = t4_init_l2t(adapter->l2t_start, adapter->l2t_end);
	if (!adapter->l2t) {
		/* We tolerate a lack of L2T, giving up some functionality */
		dev_warn(&pdev->dev, "could not allocate L2T, continuing\n");
		adapter->params.offload = 0;
	}

#if IS_ENABLED(CONFIG_IPV6)
	if ((CHELSIO_CHIP_VERSION(adapter->params.chip) <= CHELSIO_T5) &&
	    (!(t4_read_reg(adapter, LE_DB_CONFIG_A) & ASLIPCOMPEN_F))) {
		/* CLIP functionality is not present in hardware,
		 * hence disable all offload features
		 */
		dev_warn(&pdev->dev,
			 "CLIP not enabled in hardware, continuing\n");
		adapter->params.offload = 0;
	} else {
		adapter->clipt = t4_init_clip_tbl(adapter->clipt_start,
						  adapter->clipt_end);
		if (!adapter->clipt) {
			/* We tolerate a lack of clip_table, giving up
			 * some functionality
			 */
			dev_warn(&pdev->dev,
				 "could not allocate Clip table, continuing\n");
			adapter->params.offload = 0;
		}
	}
#endif
	if (is_offload(adapter) && tid_init(&adapter->tids) < 0) {
		dev_warn(&pdev->dev, "could not allocate TID table, "
			 "continuing\n");
		adapter->params.offload = 0;
	}

	if (is_offload(adapter)) {
		if (t4_read_reg(adapter, LE_DB_CONFIG_A) & HASHEN_F) {
			u32 hash_base, hash_reg;

			if (chip <= CHELSIO_T5) {
				hash_reg = LE_DB_TID_HASHBASE_A;
				hash_base = t4_read_reg(adapter, hash_reg);
				adapter->tids.hash_base = hash_base / 4;
			} else {
				hash_reg = T6_LE_DB_HASH_TID_BASE_A;
				hash_base = t4_read_reg(adapter, hash_reg);
				adapter->tids.hash_base = hash_base;
			}
		}
	}

	/* See what interrupts we'll be using */
	if (msi > 1 && enable_msix(adapter) == 0)
		adapter->flags |= USING_MSIX;
	else if (msi > 0 && pci_enable_msi(pdev) == 0)
		adapter->flags |= USING_MSI;

	/* check for PCI Express bandwidth capabiltites */
	cxgb4_check_pcie_caps(adapter);

	err = init_rss(adapter);
	if (err)
		goto out_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, i) {
		pi = adap2pinfo(adapter, i);
		netif_set_real_num_tx_queues(adapter->port[i], pi->nqsets);
		netif_set_real_num_rx_queues(adapter->port[i], pi->nqsets);

		err = register_netdev(adapter->port[i]);
		if (err)
			break;
		adapter->chan_map[pi->tx_chan] = i;
		print_port_info(adapter->port[i]);
	}
	if (i == 0) {
		dev_err(&pdev->dev, "could not register any net devices\n");
		goto out_free_dev;
	}
	if (err) {
		dev_warn(&pdev->dev, "only %d net devices registered\n", i);
		err = 0;
	}

	if (cxgb4_debugfs_root) {
		adapter->debugfs_root = debugfs_create_dir(pci_name(pdev),
							   cxgb4_debugfs_root);
		setup_debugfs(adapter);
	}

	/* PCIe EEH recovery on powerpc platforms needs fundamental reset */
	pdev->needs_freset = 1;

	if (is_offload(adapter))
		attach_ulds(adapter);

sriov:
#ifdef CONFIG_PCI_IOV
	if (func < ARRAY_SIZE(num_vf) && num_vf[func] > 0)
		if (pci_enable_sriov(pdev, num_vf[func]) == 0)
			dev_info(&pdev->dev,
				 "instantiated %u virtual functions\n",
				 num_vf[func]);
#endif
	return 0;

 out_free_dev:
	free_some_resources(adapter);
 out_unmap_bar:
	if (!is_t4(adapter->params.chip))
		iounmap(adapter->bar2);
 out_free_adapter:
	if (adapter->workq)
		destroy_workqueue(adapter->workq);

	kfree(adapter);
 out_unmap_bar0:
	iounmap(regs);
 out_disable_device:
	pci_disable_pcie_error_reporting(pdev);
	pci_disable_device(pdev);
 out_release_regions:
	pci_release_regions(pdev);
	return err;
}

static void remove_one(struct pci_dev *pdev)
{
	struct adapter *adapter = pci_get_drvdata(pdev);

#ifdef CONFIG_PCI_IOV
	pci_disable_sriov(pdev);

#endif

	if (adapter) {
		int i;

		/* Tear down per-adapter Work Queue first since it can contain
		 * references to our adapter data structure.
		 */
		destroy_workqueue(adapter->workq);

		if (is_offload(adapter))
			detach_ulds(adapter);

		disable_interrupts(adapter);

		for_each_port(adapter, i)
			if (adapter->port[i]->reg_state == NETREG_REGISTERED)
				unregister_netdev(adapter->port[i]);

		debugfs_remove_recursive(adapter->debugfs_root);

		/* If we allocated filters, free up state associated with any
		 * valid filters ...
		 */
		if (adapter->tids.ftid_tab) {
			struct filter_entry *f = &adapter->tids.ftid_tab[0];
			for (i = 0; i < (adapter->tids.nftids +
					adapter->tids.nsftids); i++, f++)
				if (f->valid)
					clear_filter(adapter, f);
		}

		if (adapter->flags & FULL_INIT_DONE)
			cxgb_down(adapter);

		free_some_resources(adapter);
#if IS_ENABLED(CONFIG_IPV6)
		t4_cleanup_clip_tbl(adapter);
#endif
		iounmap(adapter->regs);
		if (!is_t4(adapter->params.chip))
			iounmap(adapter->bar2);
		pci_disable_pcie_error_reporting(pdev);
		if ((adapter->flags & DEV_ENABLED)) {
			pci_disable_device(pdev);
			adapter->flags &= ~DEV_ENABLED;
		}
		pci_release_regions(pdev);
		synchronize_rcu();
		kfree(adapter);
	} else
		pci_release_regions(pdev);
}

static struct pci_driver cxgb4_driver = {
	.name     = KBUILD_MODNAME,
	.id_table = cxgb4_pci_tbl,
	.probe    = init_one,
	.remove   = remove_one,
	.shutdown = remove_one,
	.err_handler = &cxgb4_eeh,
};

static int __init cxgb4_init_module(void)
{
	int ret;

	/* Debugfs support is optional, just warn if this fails */
	cxgb4_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
	if (!cxgb4_debugfs_root)
		pr_warn("could not create debugfs entry, continuing\n");

	ret = pci_register_driver(&cxgb4_driver);
	if (ret < 0)
		debugfs_remove(cxgb4_debugfs_root);

#if IS_ENABLED(CONFIG_IPV6)
	if (!inet6addr_registered) {
		register_inet6addr_notifier(&cxgb4_inet6addr_notifier);
		inet6addr_registered = true;
	}
#endif

	return ret;
}

static void __exit cxgb4_cleanup_module(void)
{
#if IS_ENABLED(CONFIG_IPV6)
	if (inet6addr_registered) {
		unregister_inet6addr_notifier(&cxgb4_inet6addr_notifier);
		inet6addr_registered = false;
	}
#endif
	pci_unregister_driver(&cxgb4_driver);
	debugfs_remove(cxgb4_debugfs_root);  /* NULL ok */
}

module_init(cxgb4_init_module);
module_exit(cxgb4_cleanup_module);