drivers/net/ethernet/cavium/thunder/nic_main.c

/*
 * Copyright (C) 2015 Cavium, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License
 * as published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/etherdevice.h>
#include <linux/of.h>

#include "nic_reg.h"
#include "nic.h"
#include "q_struct.h"
#include "thunder_bgx.h"

#define DRV_NAME	"thunder-nic"
#define DRV_VERSION	"1.0"

struct hw_info {
	u8		bgx_cnt;
	u8		chans_per_lmac;
	u8		chans_per_bgx; /* Rx/Tx chans */
	u8		chans_per_rgx;
	u8		chans_per_lbk;
	u16		cpi_cnt;
	u16		rssi_cnt;
	u16		rss_ind_tbl_size;
	u16		tl4_cnt;
	u16		tl3_cnt;
	u8		tl2_cnt;
	u8		tl1_cnt;
	bool		tl1_per_bgx; /* TL1 per BGX or per LMAC */
};

struct nicpf {
	struct pci_dev		*pdev;
	struct hw_info          *hw;
	u8			node;
	unsigned int		flags;
	u8			num_vf_en;      /* No of VF enabled */
	bool			vf_enabled[MAX_NUM_VFS_SUPPORTED];
	void __iomem		*reg_base;       /* Register start address */
	u8			num_sqs_en;	/* Secondary qsets enabled */
	u64			nicvf[MAX_NUM_VFS_SUPPORTED];
	u8			vf_sqs[MAX_NUM_VFS_SUPPORTED][MAX_SQS_PER_VF];
	u8			pqs_vf[MAX_NUM_VFS_SUPPORTED];
	bool			sqs_used[MAX_NUM_VFS_SUPPORTED];
	struct pkind_cfg	pkind;
#define	NIC_SET_VF_LMAC_MAP(bgx, lmac)	(((bgx & 0xF) << 4) | (lmac & 0xF))
#define	NIC_GET_BGX_FROM_VF_LMAC_MAP(map)	((map >> 4) & 0xF)
#define	NIC_GET_LMAC_FROM_VF_LMAC_MAP(map)	(map & 0xF)
	u8			vf_lmac_map[MAX_LMAC];
	struct delayed_work     dwork;
	struct workqueue_struct *check_link;
	u8			link[MAX_LMAC];
	u8			duplex[MAX_LMAC];
	u32			speed[MAX_LMAC];
	u16			cpi_base[MAX_NUM_VFS_SUPPORTED];
	u16			rssi_base[MAX_NUM_VFS_SUPPORTED];
	bool			mbx_lock[MAX_NUM_VFS_SUPPORTED];

	/* MSI-X */
	bool			msix_enabled;
	u8			num_vec;
	struct msix_entry	*msix_entries;
	bool			irq_allocated[NIC_PF_MSIX_VECTORS];
	char			irq_name[NIC_PF_MSIX_VECTORS][20];
};

/* Supported devices */
static const struct pci_device_id nic_id_table[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, PCI_DEVICE_ID_THUNDER_NIC_PF) },
	{ 0, }  /* end of table */
};

MODULE_AUTHOR("Sunil Goutham");
MODULE_DESCRIPTION("Cavium Thunder NIC Physical Function Driver");
MODULE_LICENSE("GPL v2");
MODULE_VERSION(DRV_VERSION);
MODULE_DEVICE_TABLE(pci, nic_id_table);

/* The Cavium ThunderX network controller can *only* be found in SoCs
 * containing the ThunderX ARM64 CPU implementation.  All accesses to the device
 * registers on this platform are implicitly strongly ordered with respect
 * to memory accesses. So writeq_relaxed() and readq_relaxed() are safe to use
 * with no memory barriers in this driver.  The readq()/writeq() functions add
 * explicit ordering operation which in this case are redundant, and only
 * add overhead.
 */

/* Register read/write APIs */
static void nic_reg_write(struct nicpf *nic, u64 offset, u64 val)
{
	writeq_relaxed(val, nic->reg_base + offset);
}

static u64 nic_reg_read(struct nicpf *nic, u64 offset)
{
	return readq_relaxed(nic->reg_base + offset);
}

/* PF -> VF mailbox communication APIs */
static void nic_enable_mbx_intr(struct nicpf *nic)
{
	int vf_cnt = pci_sriov_get_totalvfs(nic->pdev);

#define INTR_MASK(vfs) ((vfs < 64) ? (BIT_ULL(vfs) - 1) : (~0ull))

	/* Clear it, to avoid spurious interrupts (if any) */
	nic_reg_write(nic, NIC_PF_MAILBOX_INT, INTR_MASK(vf_cnt));

	/* Enable mailbox interrupt for all VFs */
	nic_reg_write(nic, NIC_PF_MAILBOX_ENA_W1S, INTR_MASK(vf_cnt));
	/* One mailbox intr enable reg per 64 VFs */
	if (vf_cnt > 64) {
		nic_reg_write(nic, NIC_PF_MAILBOX_INT + sizeof(u64),
			      INTR_MASK(vf_cnt - 64));
		nic_reg_write(nic, NIC_PF_MAILBOX_ENA_W1S + sizeof(u64),
			      INTR_MASK(vf_cnt - 64));
	}
}

static void nic_clear_mbx_intr(struct nicpf *nic, int vf, int mbx_reg)
{
	nic_reg_write(nic, NIC_PF_MAILBOX_INT + (mbx_reg << 3), BIT_ULL(vf));
}

static u64 nic_get_mbx_addr(int vf)
{
	return NIC_PF_VF_0_127_MAILBOX_0_1 + (vf << NIC_VF_NUM_SHIFT);
}

/* Send a mailbox message to VF
 * @vf: vf to which this message to be sent
 * @mbx: Message to be sent
 */
static void nic_send_msg_to_vf(struct nicpf *nic, int vf, union nic_mbx *mbx)
{
	void __iomem *mbx_addr = nic->reg_base + nic_get_mbx_addr(vf);
	u64 *msg = (u64 *)mbx;

	/* In first revision HW, mbox interrupt is triggerred
	 * when PF writes to MBOX(1), in next revisions when
	 * PF writes to MBOX(0)
	 */
	if (pass1_silicon(nic->pdev)) {
		/* see the comment for nic_reg_write()/nic_reg_read()
		 * functions above
		 */
		writeq_relaxed(msg[0], mbx_addr);
		writeq_relaxed(msg[1], mbx_addr + 8);
	} else {
		writeq_relaxed(msg[1], mbx_addr + 8);
		writeq_relaxed(msg[0], mbx_addr);
	}
}

/* Responds to VF's READY message with VF's
 * ID, node, MAC address e.t.c
 * @vf: VF which sent READY message
 */
static void nic_mbx_send_ready(struct nicpf *nic, int vf)
{
	union nic_mbx mbx = {};
	int bgx_idx, lmac;
	const char *mac;

	mbx.nic_cfg.msg = NIC_MBOX_MSG_READY;
	mbx.nic_cfg.vf_id = vf;

	mbx.nic_cfg.tns_mode = NIC_TNS_BYPASS_MODE;

	if (vf < MAX_LMAC) {
		bgx_idx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]);
		lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]);

		mac = bgx_get_lmac_mac(nic->node, bgx_idx, lmac);
		if (mac)
			ether_addr_copy((u8 *)&mbx.nic_cfg.mac_addr, mac);
	}
	mbx.nic_cfg.sqs_mode = (vf >= nic->num_vf_en) ? true : false;
	mbx.nic_cfg.node_id = nic->node;

	mbx.nic_cfg.loopback_supported = vf < MAX_LMAC;

	nic_send_msg_to_vf(nic, vf, &mbx);
}

/* ACKs VF's mailbox message
 * @vf: VF to which ACK to be sent
 */
static void nic_mbx_send_ack(struct nicpf *nic, int vf)
{
	union nic_mbx mbx = {};

	mbx.msg.msg = NIC_MBOX_MSG_ACK;
	nic_send_msg_to_vf(nic, vf, &mbx);
}

/* NACKs VF's mailbox message that PF is not able to
 * complete the action
 * @vf: VF to which ACK to be sent
 */
static void nic_mbx_send_nack(struct nicpf *nic, int vf)
{
	union nic_mbx mbx = {};

	mbx.msg.msg = NIC_MBOX_MSG_NACK;
	nic_send_msg_to_vf(nic, vf, &mbx);
}

/* Flush all in flight receive packets to memory and
 * bring down an active RQ
 */
static int nic_rcv_queue_sw_sync(struct nicpf *nic)
{
	u16 timeout = ~0x00;

	nic_reg_write(nic, NIC_PF_SW_SYNC_RX, 0x01);
	/* Wait till sync cycle is finished */
	while (timeout) {
		if (nic_reg_read(nic, NIC_PF_SW_SYNC_RX_DONE) & 0x1)
			break;
		timeout--;
	}
	nic_reg_write(nic, NIC_PF_SW_SYNC_RX, 0x00);
	if (!timeout) {
		dev_err(&nic->pdev->dev, "Receive queue software sync failed");
		return 1;
	}
	return 0;
}

/* Get BGX Rx/Tx stats and respond to VF's request */
static void nic_get_bgx_stats(struct nicpf *nic, struct bgx_stats_msg *bgx)
{
	int bgx_idx, lmac;
	union nic_mbx mbx = {};

	bgx_idx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[bgx->vf_id]);
	lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[bgx->vf_id]);

	mbx.bgx_stats.msg = NIC_MBOX_MSG_BGX_STATS;
	mbx.bgx_stats.vf_id = bgx->vf_id;
	mbx.bgx_stats.rx = bgx->rx;
	mbx.bgx_stats.idx = bgx->idx;
	if (bgx->rx)
		mbx.bgx_stats.stats = bgx_get_rx_stats(nic->node, bgx_idx,
							    lmac, bgx->idx);
	else
		mbx.bgx_stats.stats = bgx_get_tx_stats(nic->node, bgx_idx,
							    lmac, bgx->idx);
	nic_send_msg_to_vf(nic, bgx->vf_id, &mbx);
}

/* Update hardware min/max frame size */
static int nic_update_hw_frs(struct nicpf *nic, int new_frs, int vf)
{
	if ((new_frs > NIC_HW_MAX_FRS) || (new_frs < NIC_HW_MIN_FRS)) {
		dev_err(&nic->pdev->dev,
			"Invalid MTU setting from VF%d rejected, should be between %d and %d\n",
			   vf, NIC_HW_MIN_FRS, NIC_HW_MAX_FRS);
		return 1;
	}
	new_frs += ETH_HLEN;
	if (new_frs <= nic->pkind.maxlen)
		return 0;

	nic->pkind.maxlen = new_frs;
	nic_reg_write(nic, NIC_PF_PKIND_0_15_CFG, *(u64 *)&nic->pkind);
	return 0;
}

/* Set minimum transmit packet size */
static void nic_set_tx_pkt_pad(struct nicpf *nic, int size)
{
	int lmac;
	u64 lmac_cfg;

	/* Max value that can be set is 60 */
	if (size > 60)
		size = 60;

	for (lmac = 0; lmac < (MAX_BGX_PER_CN88XX * MAX_LMAC_PER_BGX); lmac++) {
		lmac_cfg = nic_reg_read(nic, NIC_PF_LMAC_0_7_CFG | (lmac << 3));
		lmac_cfg &= ~(0xF << 2);
		lmac_cfg |= ((size / 4) << 2);
		nic_reg_write(nic, NIC_PF_LMAC_0_7_CFG | (lmac << 3), lmac_cfg);
	}
}

/* Function to check number of LMACs present and set VF::LMAC mapping.
 * Mapping will be used while initializing channels.
 */
static void nic_set_lmac_vf_mapping(struct nicpf *nic)
{
	unsigned bgx_map = bgx_get_map(nic->node);
	int bgx, next_bgx_lmac = 0;
	int lmac, lmac_cnt = 0;
	u64 lmac_credit;

	nic->num_vf_en = 0;

	for (bgx = 0; bgx < nic->hw->bgx_cnt; bgx++) {
		if (!(bgx_map & (1 << bgx)))
			continue;
		lmac_cnt = bgx_get_lmac_count(nic->node, bgx);
		for (lmac = 0; lmac < lmac_cnt; lmac++)
			nic->vf_lmac_map[next_bgx_lmac++] =
						NIC_SET_VF_LMAC_MAP(bgx, lmac);
		nic->num_vf_en += lmac_cnt;

		/* Program LMAC credits */
		lmac_credit = (1ull << 1); /* channel credit enable */
		lmac_credit |= (0x1ff << 2); /* Max outstanding pkt count */
		/* 48KB BGX Tx buffer size, each unit is of size 16bytes */
		lmac_credit |= (((((48 * 1024) / lmac_cnt) -
				NIC_HW_MAX_FRS) / 16) << 12);
		lmac = bgx * MAX_LMAC_PER_BGX;
		for (; lmac < lmac_cnt + (bgx * MAX_LMAC_PER_BGX); lmac++)
			nic_reg_write(nic,
				      NIC_PF_LMAC_0_7_CREDIT + (lmac * 8),
				      lmac_credit);
	}
}

static void nic_get_hw_info(struct nicpf *nic)
{
	u16 sdevid;
	struct hw_info *hw = nic->hw;

	pci_read_config_word(nic->pdev, PCI_SUBSYSTEM_ID, &sdevid);

	switch (sdevid) {
	case PCI_SUBSYS_DEVID_88XX_NIC_PF:
		hw->bgx_cnt = MAX_BGX_PER_CN88XX;
		hw->chans_per_lmac = 16;
		hw->chans_per_bgx = 128;
		hw->cpi_cnt = 2048;
		hw->rssi_cnt = 4096;
		hw->rss_ind_tbl_size = NIC_MAX_RSS_IDR_TBL_SIZE;
		hw->tl3_cnt = 256;
		hw->tl2_cnt = 64;
		hw->tl1_cnt = 2;
		hw->tl1_per_bgx = true;
		break;
	case PCI_SUBSYS_DEVID_81XX_NIC_PF:
		hw->bgx_cnt = MAX_BGX_PER_CN81XX;
		hw->chans_per_lmac = 8;
		hw->chans_per_bgx = 32;
		hw->chans_per_rgx = 8;
		hw->chans_per_lbk = 24;
		hw->cpi_cnt = 512;
		hw->rssi_cnt = 256;
		hw->rss_ind_tbl_size = 32; /* Max RSSI / Max interfaces */
		hw->tl3_cnt = 64;
		hw->tl2_cnt = 16;
		hw->tl1_cnt = 10;
		hw->tl1_per_bgx = false;
		break;
	case PCI_SUBSYS_DEVID_83XX_NIC_PF:
		hw->bgx_cnt = MAX_BGX_PER_CN83XX;
		hw->chans_per_lmac = 8;
		hw->chans_per_bgx = 32;
		hw->chans_per_lbk = 64;
		hw->cpi_cnt = 2048;
		hw->rssi_cnt = 1024;
		hw->rss_ind_tbl_size = 64; /* Max RSSI / Max interfaces */
		hw->tl3_cnt = 256;
		hw->tl2_cnt = 64;
		hw->tl1_cnt = 18;
		hw->tl1_per_bgx = false;
		break;
	}
	hw->tl4_cnt = MAX_QUEUES_PER_QSET * pci_sriov_get_totalvfs(nic->pdev);
}

#define BGX0_BLOCK 8
#define BGX1_BLOCK 9

static void nic_init_hw(struct nicpf *nic)
{
	int i;
	u64 cqm_cfg;

	/* Get HW capability info */
	nic_get_hw_info(nic);

	/* Enable NIC HW block */
	nic_reg_write(nic, NIC_PF_CFG, 0x3);

	/* Enable backpressure */
	nic_reg_write(nic, NIC_PF_BP_CFG, (1ULL << 6) | 0x03);

	/* TNS and TNS bypass modes are present only on 88xx */
	if (nic->pdev->subsystem_device == PCI_SUBSYS_DEVID_88XX_NIC_PF) {
		/* Disable TNS mode on both interfaces */
		nic_reg_write(nic, NIC_PF_INTF_0_1_SEND_CFG,
			      (NIC_TNS_BYPASS_MODE << 7) | BGX0_BLOCK);
		nic_reg_write(nic, NIC_PF_INTF_0_1_SEND_CFG | (1 << 8),
			      (NIC_TNS_BYPASS_MODE << 7) | BGX1_BLOCK);
	}

	nic_reg_write(nic, NIC_PF_INTF_0_1_BP_CFG,
		      (1ULL << 63) | BGX0_BLOCK);
	nic_reg_write(nic, NIC_PF_INTF_0_1_BP_CFG + (1 << 8),
		      (1ULL << 63) | BGX1_BLOCK);

	/* PKIND configuration */
	nic->pkind.minlen = 0;
	nic->pkind.maxlen = NIC_HW_MAX_FRS + ETH_HLEN;
	nic->pkind.lenerr_en = 1;
	nic->pkind.rx_hdr = 0;
	nic->pkind.hdr_sl = 0;

	for (i = 0; i < NIC_MAX_PKIND; i++)
		nic_reg_write(nic, NIC_PF_PKIND_0_15_CFG | (i << 3),
			      *(u64 *)&nic->pkind);

	nic_set_tx_pkt_pad(nic, NIC_HW_MIN_FRS);

	/* Timer config */
	nic_reg_write(nic, NIC_PF_INTR_TIMER_CFG, NICPF_CLK_PER_INT_TICK);

	/* Enable VLAN ethertype matching and stripping */
	nic_reg_write(nic, NIC_PF_RX_ETYPE_0_7,
		      (2 << 19) | (ETYPE_ALG_VLAN_STRIP << 16) | ETH_P_8021Q);

	/* Check if HW expected value is higher (could be in future chips) */
	cqm_cfg = nic_reg_read(nic, NIC_PF_CQM_CFG);
	if (cqm_cfg < NICPF_CQM_MIN_DROP_LEVEL)
		nic_reg_write(nic, NIC_PF_CQM_CFG, NICPF_CQM_MIN_DROP_LEVEL);
}

/* Channel parse index configuration */
static void nic_config_cpi(struct nicpf *nic, struct cpi_cfg_msg *cfg)
{
	struct hw_info *hw = nic->hw;
	u32 vnic, bgx, lmac, chan;
	u32 padd, cpi_count = 0;
	u64 cpi_base, cpi, rssi_base, rssi;
	u8  qset, rq_idx = 0;

	vnic = cfg->vf_id;
	bgx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vnic]);
	lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vnic]);

	chan = (lmac * hw->chans_per_lmac) + (bgx * hw->chans_per_bgx);
	cpi_base = (lmac * NIC_MAX_CPI_PER_LMAC) +
		   (bgx * (hw->cpi_cnt / hw->bgx_cnt));
	rssi_base = (lmac * hw->rss_ind_tbl_size) +
		    (bgx * (hw->rssi_cnt / hw->bgx_cnt));

	/* Rx channel configuration */
	nic_reg_write(nic, NIC_PF_CHAN_0_255_RX_BP_CFG | (chan << 3),
		      (1ull << 63) | (vnic << 0));
	nic_reg_write(nic, NIC_PF_CHAN_0_255_RX_CFG | (chan << 3),
		      ((u64)cfg->cpi_alg << 62) | (cpi_base << 48));

	if (cfg->cpi_alg == CPI_ALG_NONE)
		cpi_count = 1;
	else if (cfg->cpi_alg == CPI_ALG_VLAN) /* 3 bits of PCP */
		cpi_count = 8;
	else if (cfg->cpi_alg == CPI_ALG_VLAN16) /* 3 bits PCP + DEI */
		cpi_count = 16;
	else if (cfg->cpi_alg == CPI_ALG_DIFF) /* 6bits DSCP */
		cpi_count = NIC_MAX_CPI_PER_LMAC;

	/* RSS Qset, Qidx mapping */
	qset = cfg->vf_id;
	rssi = rssi_base;
	for (; rssi < (rssi_base + cfg->rq_cnt); rssi++) {
		nic_reg_write(nic, NIC_PF_RSSI_0_4097_RQ | (rssi << 3),
			      (qset << 3) | rq_idx);
		rq_idx++;
	}

	rssi = 0;
	cpi = cpi_base;
	for (; cpi < (cpi_base + cpi_count); cpi++) {
		/* Determine port to channel adder */
		if (cfg->cpi_alg != CPI_ALG_DIFF)
			padd = cpi % cpi_count;
		else
			padd = cpi % 8; /* 3 bits CS out of 6bits DSCP */

		/* Leave RSS_SIZE as '0' to disable RSS */
		if (pass1_silicon(nic->pdev)) {
			nic_reg_write(nic, NIC_PF_CPI_0_2047_CFG | (cpi << 3),
				      (vnic << 24) | (padd << 16) |
				      (rssi_base + rssi));
		} else {
			/* Set MPI_ALG to '0' to disable MCAM parsing */
			nic_reg_write(nic, NIC_PF_CPI_0_2047_CFG | (cpi << 3),
				      (padd << 16));
			/* MPI index is same as CPI if MPI_ALG is not enabled */
			nic_reg_write(nic, NIC_PF_MPI_0_2047_CFG | (cpi << 3),
				      (vnic << 24) | (rssi_base + rssi));
		}

		if ((rssi + 1) >= cfg->rq_cnt)
			continue;

		if (cfg->cpi_alg == CPI_ALG_VLAN)
			rssi++;
		else if (cfg->cpi_alg == CPI_ALG_VLAN16)
			rssi = ((cpi - cpi_base) & 0xe) >> 1;
		else if (cfg->cpi_alg == CPI_ALG_DIFF)
			rssi = ((cpi - cpi_base) & 0x38) >> 3;
	}
	nic->cpi_base[cfg->vf_id] = cpi_base;
	nic->rssi_base[cfg->vf_id] = rssi_base;
}

/* Responsds to VF with its RSS indirection table size */
static void nic_send_rss_size(struct nicpf *nic, int vf)
{
	union nic_mbx mbx = {};
	u64  *msg;

	msg = (u64 *)&mbx;

	mbx.rss_size.msg = NIC_MBOX_MSG_RSS_SIZE;
	mbx.rss_size.ind_tbl_size = nic->hw->rss_ind_tbl_size;
	nic_send_msg_to_vf(nic, vf, &mbx);
}

/* Receive side scaling configuration
 * configure:
 * - RSS index
 * - indir table i.e hash::RQ mapping
 * - no of hash bits to consider
 */
static void nic_config_rss(struct nicpf *nic, struct rss_cfg_msg *cfg)
{
	u8  qset, idx = 0;
	u64 cpi_cfg, cpi_base, rssi_base, rssi;
	u64 idx_addr;

	rssi_base = nic->rssi_base[cfg->vf_id] + cfg->tbl_offset;

	rssi = rssi_base;
	qset = cfg->vf_id;

	for (; rssi < (rssi_base + cfg->tbl_len); rssi++) {
		u8 svf = cfg->ind_tbl[idx] >> 3;

		if (svf)
			qset = nic->vf_sqs[cfg->vf_id][svf - 1];
		else
			qset = cfg->vf_id;
		nic_reg_write(nic, NIC_PF_RSSI_0_4097_RQ | (rssi << 3),
			      (qset << 3) | (cfg->ind_tbl[idx] & 0x7));
		idx++;
	}

	cpi_base = nic->cpi_base[cfg->vf_id];
	if (pass1_silicon(nic->pdev))
		idx_addr = NIC_PF_CPI_0_2047_CFG;
	else
		idx_addr = NIC_PF_MPI_0_2047_CFG;
	cpi_cfg = nic_reg_read(nic, idx_addr | (cpi_base << 3));
	cpi_cfg &= ~(0xFULL << 20);
	cpi_cfg |= (cfg->hash_bits << 20);
	nic_reg_write(nic, idx_addr | (cpi_base << 3), cpi_cfg);
}

/* 4 level transmit side scheduler configutation
 * for TNS bypass mode
 *
 * Sample configuration for SQ0 on 88xx
 * VNIC0-SQ0 -> TL4(0)   -> TL3[0]   -> TL2[0]  -> TL1[0] -> BGX0
 * VNIC1-SQ0 -> TL4(8)   -> TL3[2]   -> TL2[0]  -> TL1[0] -> BGX0
 * VNIC2-SQ0 -> TL4(16)  -> TL3[4]   -> TL2[1]  -> TL1[0] -> BGX0
 * VNIC3-SQ0 -> TL4(24)  -> TL3[6]   -> TL2[1]  -> TL1[0] -> BGX0
 * VNIC4-SQ0 -> TL4(512) -> TL3[128] -> TL2[32] -> TL1[1] -> BGX1
 * VNIC5-SQ0 -> TL4(520) -> TL3[130] -> TL2[32] -> TL1[1] -> BGX1
 * VNIC6-SQ0 -> TL4(528) -> TL3[132] -> TL2[33] -> TL1[1] -> BGX1
 * VNIC7-SQ0 -> TL4(536) -> TL3[134] -> TL2[33] -> TL1[1] -> BGX1
 */
static void nic_tx_channel_cfg(struct nicpf *nic, u8 vnic,
			       struct sq_cfg_msg *sq)
{
	struct hw_info *hw = nic->hw;
	u32 bgx, lmac, chan;
	u32 tl2, tl3, tl4;
	u32 rr_quantum;
	u8 sq_idx = sq->sq_num;
	u8 pqs_vnic;
	int svf;

	if (sq->sqs_mode)
		pqs_vnic = nic->pqs_vf[vnic];
	else
		pqs_vnic = vnic;

	bgx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[pqs_vnic]);
	lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[pqs_vnic]);

	/* 24 bytes for FCS, IPG and preamble */
	rr_quantum = ((NIC_HW_MAX_FRS + 24) / 4);

	/* For 88xx 0-511 TL4 transmits via BGX0 and
	 * 512-1023 TL4s transmit via BGX1.
	 */
	if (hw->tl1_per_bgx) {
		tl4 = bgx * (hw->tl4_cnt / hw->bgx_cnt);
		if (!sq->sqs_mode) {
			tl4 += (lmac * MAX_QUEUES_PER_QSET);
		} else {
			for (svf = 0; svf < MAX_SQS_PER_VF; svf++) {
				if (nic->vf_sqs[pqs_vnic][svf] == vnic)
					break;
			}
			tl4 += (MAX_LMAC_PER_BGX * MAX_QUEUES_PER_QSET);
			tl4 += (lmac * MAX_QUEUES_PER_QSET * MAX_SQS_PER_VF);
			tl4 += (svf * MAX_QUEUES_PER_QSET);
		}
	} else {
		tl4 = (vnic * MAX_QUEUES_PER_QSET);
	}
	tl4 += sq_idx;

	tl3 = tl4 / (hw->tl4_cnt / hw->tl3_cnt);
	nic_reg_write(nic, NIC_PF_QSET_0_127_SQ_0_7_CFG2 |
		      ((u64)vnic << NIC_QS_ID_SHIFT) |
		      ((u32)sq_idx << NIC_Q_NUM_SHIFT), tl4);
	nic_reg_write(nic, NIC_PF_TL4_0_1023_CFG | (tl4 << 3),
		      ((u64)vnic << 27) | ((u32)sq_idx << 24) | rr_quantum);

	nic_reg_write(nic, NIC_PF_TL3_0_255_CFG | (tl3 << 3), rr_quantum);

	/* On 88xx 0-127 channels are for BGX0 and
	 * 127-255 channels for BGX1.
	 *
	 * On 81xx/83xx TL3_CHAN reg should be configured with channel
	 * within LMAC i.e 0-7 and not the actual channel number like on 88xx
	 */
	chan = (lmac * hw->chans_per_lmac) + (bgx * hw->chans_per_bgx);
	if (hw->tl1_per_bgx)
		nic_reg_write(nic, NIC_PF_TL3_0_255_CHAN | (tl3 << 3), chan);
	else
		nic_reg_write(nic, NIC_PF_TL3_0_255_CHAN | (tl3 << 3), 0);

	/* Enable backpressure on the channel */
	nic_reg_write(nic, NIC_PF_CHAN_0_255_TX_CFG | (chan << 3), 1);

	tl2 = tl3 >> 2;
	nic_reg_write(nic, NIC_PF_TL3A_0_63_CFG | (tl2 << 3), tl2);
	nic_reg_write(nic, NIC_PF_TL2_0_63_CFG | (tl2 << 3), rr_quantum);
	/* No priorities as of now */
	nic_reg_write(nic, NIC_PF_TL2_0_63_PRI | (tl2 << 3), 0x00);

	/* Unlike 88xx where TL2s 0-31 transmits to TL1 '0' and rest to TL1 '1'
	 * on 81xx/83xx TL2 needs to be configured to transmit to one of the
	 * possible LMACs.
	 *
	 * This register doesn't exist on 88xx.
	 */
	if (!hw->tl1_per_bgx)
		nic_reg_write(nic, NIC_PF_TL2_LMAC | (tl2 << 3),
			      lmac + (bgx * MAX_LMAC_PER_BGX));
}

/* Send primary nicvf pointer to secondary QS's VF */
static void nic_send_pnicvf(struct nicpf *nic, int sqs)
{
	union nic_mbx mbx = {};

	mbx.nicvf.msg = NIC_MBOX_MSG_PNICVF_PTR;
	mbx.nicvf.nicvf = nic->nicvf[nic->pqs_vf[sqs]];
	nic_send_msg_to_vf(nic, sqs, &mbx);
}

/* Send SQS's nicvf pointer to primary QS's VF */
static void nic_send_snicvf(struct nicpf *nic, struct nicvf_ptr *nicvf)
{
	union nic_mbx mbx = {};
	int sqs_id = nic->vf_sqs[nicvf->vf_id][nicvf->sqs_id];

	mbx.nicvf.msg = NIC_MBOX_MSG_SNICVF_PTR;
	mbx.nicvf.sqs_id = nicvf->sqs_id;
	mbx.nicvf.nicvf = nic->nicvf[sqs_id];
	nic_send_msg_to_vf(nic, nicvf->vf_id, &mbx);
}

/* Find next available Qset that can be assigned as a
 * secondary Qset to a VF.
 */
static int nic_nxt_avail_sqs(struct nicpf *nic)
{
	int sqs;

	for (sqs = 0; sqs < nic->num_sqs_en; sqs++) {
		if (!nic->sqs_used[sqs])
			nic->sqs_used[sqs] = true;
		else
			continue;
		return sqs + nic->num_vf_en;
	}
	return -1;
}

/* Allocate additional Qsets for requested VF */
static void nic_alloc_sqs(struct nicpf *nic, struct sqs_alloc *sqs)
{
	union nic_mbx mbx = {};
	int idx, alloc_qs = 0;
	int sqs_id;

	if (!nic->num_sqs_en)
		goto send_mbox;

	for (idx = 0; idx < sqs->qs_count; idx++) {
		sqs_id = nic_nxt_avail_sqs(nic);
		if (sqs_id < 0)
			break;
		nic->vf_sqs[sqs->vf_id][idx] = sqs_id;
		nic->pqs_vf[sqs_id] = sqs->vf_id;
		alloc_qs++;
	}

send_mbox:
	mbx.sqs_alloc.msg = NIC_MBOX_MSG_ALLOC_SQS;
	mbx.sqs_alloc.vf_id = sqs->vf_id;
	mbx.sqs_alloc.qs_count = alloc_qs;
	nic_send_msg_to_vf(nic, sqs->vf_id, &mbx);
}

static int nic_config_loopback(struct nicpf *nic, struct set_loopback *lbk)
{
	int bgx_idx, lmac_idx;

	if (lbk->vf_id > MAX_LMAC)
		return -1;

	bgx_idx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[lbk->vf_id]);
	lmac_idx = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[lbk->vf_id]);

	bgx_lmac_internal_loopback(nic->node, bgx_idx, lmac_idx, lbk->enable);

	return 0;
}

static void nic_enable_vf(struct nicpf *nic, int vf, bool enable)
{
	int bgx, lmac;

	nic->vf_enabled[vf] = enable;

	if (vf >= nic->num_vf_en)
		return;

	bgx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]);
	lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]);

	bgx_lmac_rx_tx_enable(nic->node, bgx, lmac, enable);
}

/* Interrupt handler to handle mailbox messages from VFs */
static void nic_handle_mbx_intr(struct nicpf *nic, int vf)
{
	union nic_mbx mbx = {};
	u64 *mbx_data;
	u64 mbx_addr;
	u64 reg_addr;
	u64 cfg;
	int bgx, lmac;
	int i;
	int ret = 0;

	nic->mbx_lock[vf] = true;

	mbx_addr = nic_get_mbx_addr(vf);
	mbx_data = (u64 *)&mbx;

	for (i = 0; i < NIC_PF_VF_MAILBOX_SIZE; i++) {
		*mbx_data = nic_reg_read(nic, mbx_addr);
		mbx_data++;
		mbx_addr += sizeof(u64);
	}

	dev_dbg(&nic->pdev->dev, "%s: Mailbox msg %d from VF%d\n",
		__func__, mbx.msg.msg, vf);
	switch (mbx.msg.msg) {
	case NIC_MBOX_MSG_READY:
		nic_mbx_send_ready(nic, vf);
		if (vf < MAX_LMAC) {
			nic->link[vf] = 0;
			nic->duplex[vf] = 0;
			nic->speed[vf] = 0;
		}
		ret = 1;
		break;
	case NIC_MBOX_MSG_QS_CFG:
		reg_addr = NIC_PF_QSET_0_127_CFG |
			   (mbx.qs.num << NIC_QS_ID_SHIFT);
		cfg = mbx.qs.cfg;
		/* Check if its a secondary Qset */
		if (vf >= nic->num_vf_en) {
			cfg = cfg & (~0x7FULL);
			/* Assign this Qset to primary Qset's VF */
			cfg |= nic->pqs_vf[vf];
		}
		nic_reg_write(nic, reg_addr, cfg);
		break;
	case NIC_MBOX_MSG_RQ_CFG:
		reg_addr = NIC_PF_QSET_0_127_RQ_0_7_CFG |
			   (mbx.rq.qs_num << NIC_QS_ID_SHIFT) |
			   (mbx.rq.rq_num << NIC_Q_NUM_SHIFT);
		nic_reg_write(nic, reg_addr, mbx.rq.cfg);
		/* Enable CQE_RX2_S extension in CQE_RX descriptor.
		 * This gets appended by default on 81xx/83xx chips,
		 * for consistency enabling the same on 88xx pass2
		 * where this is introduced.
		 */
		if (pass2_silicon(nic->pdev))
			nic_reg_write(nic, NIC_PF_RX_CFG, 0x01);
		break;
	case NIC_MBOX_MSG_RQ_BP_CFG:
		reg_addr = NIC_PF_QSET_0_127_RQ_0_7_BP_CFG |
			   (mbx.rq.qs_num << NIC_QS_ID_SHIFT) |
			   (mbx.rq.rq_num << NIC_Q_NUM_SHIFT);
		nic_reg_write(nic, reg_addr, mbx.rq.cfg);
		break;
	case NIC_MBOX_MSG_RQ_SW_SYNC:
		ret = nic_rcv_queue_sw_sync(nic);
		break;
	case NIC_MBOX_MSG_RQ_DROP_CFG:
		reg_addr = NIC_PF_QSET_0_127_RQ_0_7_DROP_CFG |
			   (mbx.rq.qs_num << NIC_QS_ID_SHIFT) |
			   (mbx.rq.rq_num << NIC_Q_NUM_SHIFT);
		nic_reg_write(nic, reg_addr, mbx.rq.cfg);
		break;
	case NIC_MBOX_MSG_SQ_CFG:
		reg_addr = NIC_PF_QSET_0_127_SQ_0_7_CFG |
			   (mbx.sq.qs_num << NIC_QS_ID_SHIFT) |
			   (mbx.sq.sq_num << NIC_Q_NUM_SHIFT);
		nic_reg_write(nic, reg_addr, mbx.sq.cfg);
		nic_tx_channel_cfg(nic, mbx.qs.num, &mbx.sq);
		break;
	case NIC_MBOX_MSG_SET_MAC:
		if (vf >= nic->num_vf_en)
			break;
		lmac = mbx.mac.vf_id;
		bgx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[lmac]);
		lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[lmac]);
		bgx_set_lmac_mac(nic->node, bgx, lmac, mbx.mac.mac_addr);
		break;
	case NIC_MBOX_MSG_SET_MAX_FRS:
		ret = nic_update_hw_frs(nic, mbx.frs.max_frs,
					mbx.frs.vf_id);
		break;
	case NIC_MBOX_MSG_CPI_CFG:
		nic_config_cpi(nic, &mbx.cpi_cfg);
		break;
	case NIC_MBOX_MSG_RSS_SIZE:
		nic_send_rss_size(nic, vf);
		goto unlock;
	case NIC_MBOX_MSG_RSS_CFG:
	case NIC_MBOX_MSG_RSS_CFG_CONT:
		nic_config_rss(nic, &mbx.rss_cfg);
		break;
	case NIC_MBOX_MSG_CFG_DONE:
		/* Last message of VF config msg sequence */
		nic_enable_vf(nic, vf, true);
		goto unlock;
	case NIC_MBOX_MSG_SHUTDOWN:
		/* First msg in VF teardown sequence */
		if (vf >= nic->num_vf_en)
			nic->sqs_used[vf - nic->num_vf_en] = false;
		nic->pqs_vf[vf] = 0;
		nic_enable_vf(nic, vf, false);
		break;
	case NIC_MBOX_MSG_ALLOC_SQS:
		nic_alloc_sqs(nic, &mbx.sqs_alloc);
		goto unlock;
	case NIC_MBOX_MSG_NICVF_PTR:
		nic->nicvf[vf] = mbx.nicvf.nicvf;
		break;
	case NIC_MBOX_MSG_PNICVF_PTR:
		nic_send_pnicvf(nic, vf);
		goto unlock;
	case NIC_MBOX_MSG_SNICVF_PTR:
		nic_send_snicvf(nic, &mbx.nicvf);
		goto unlock;
	case NIC_MBOX_MSG_BGX_STATS:
		nic_get_bgx_stats(nic, &mbx.bgx_stats);
		goto unlock;
	case NIC_MBOX_MSG_LOOPBACK:
		ret = nic_config_loopback(nic, &mbx.lbk);
		break;
	default:
		dev_err(&nic->pdev->dev,
			"Invalid msg from VF%d, msg 0x%x\n", vf, mbx.msg.msg);
		break;
	}

	if (!ret)
		nic_mbx_send_ack(nic, vf);
	else if (mbx.msg.msg != NIC_MBOX_MSG_READY)
		nic_mbx_send_nack(nic, vf);
unlock:
	nic->mbx_lock[vf] = false;
}

static irqreturn_t nic_mbx_intr_handler(int irq, void *nic_irq)
{
	struct nicpf *nic = (struct nicpf *)nic_irq;
	int mbx;
	u64 intr;
	u8  vf, vf_per_mbx_reg = 64;

	if (irq == nic->msix_entries[NIC_PF_INTR_ID_MBOX0].vector)
		mbx = 0;
	else
		mbx = 1;

	intr = nic_reg_read(nic, NIC_PF_MAILBOX_INT + (mbx << 3));
	dev_dbg(&nic->pdev->dev, "PF interrupt Mbox%d 0x%llx\n", mbx, intr);
	for (vf = 0; vf < vf_per_mbx_reg; vf++) {
		if (intr & (1ULL << vf)) {
			dev_dbg(&nic->pdev->dev, "Intr from VF %d\n",
				vf + (mbx * vf_per_mbx_reg));

			nic_handle_mbx_intr(nic, vf + (mbx * vf_per_mbx_reg));
			nic_clear_mbx_intr(nic, vf, mbx);
		}
	}
	return IRQ_HANDLED;
}

static int nic_enable_msix(struct nicpf *nic)
{
	int i, ret;

	nic->num_vec = pci_msix_vec_count(nic->pdev);

	nic->msix_entries = kmalloc_array(nic->num_vec,
					  sizeof(struct msix_entry),
					  GFP_KERNEL);
	if (!nic->msix_entries)
		return -ENOMEM;

	for (i = 0; i < nic->num_vec; i++)
		nic->msix_entries[i].entry = i;

	ret = pci_enable_msix(nic->pdev, nic->msix_entries, nic->num_vec);
	if (ret) {
		dev_err(&nic->pdev->dev,
			"Request for #%d msix vectors failed, returned %d\n",
			   nic->num_vec, ret);
		kfree(nic->msix_entries);
		return ret;
	}

	nic->msix_enabled = 1;
	return 0;
}

static void nic_disable_msix(struct nicpf *nic)
{
	if (nic->msix_enabled) {
		pci_disable_msix(nic->pdev);
		kfree(nic->msix_entries);
		nic->msix_enabled = 0;
		nic->num_vec = 0;
	}
}

static void nic_free_all_interrupts(struct nicpf *nic)
{
	int irq;

	for (irq = 0; irq < nic->num_vec; irq++) {
		if (nic->irq_allocated[irq])
			free_irq(nic->msix_entries[irq].vector, nic);
		nic->irq_allocated[irq] = false;
	}
}

static int nic_register_interrupts(struct nicpf *nic)
{
	int i, ret;

	/* Enable MSI-X */
	ret = nic_enable_msix(nic);
	if (ret)
		return ret;

	/* Register mailbox interrupt handler */
	for (i = NIC_PF_INTR_ID_MBOX0; i < nic->num_vec; i++) {
		sprintf(nic->irq_name[i],
			"NICPF Mbox%d", (i - NIC_PF_INTR_ID_MBOX0));

		ret = request_irq(nic->msix_entries[i].vector,
				  nic_mbx_intr_handler, 0,
				  nic->irq_name[i], nic);
		if (ret)
			goto fail;

		nic->irq_allocated[i] = true;
	}

	/* Enable mailbox interrupt */
	nic_enable_mbx_intr(nic);
	return 0;

fail:
	dev_err(&nic->pdev->dev, "Request irq failed\n");
	nic_free_all_interrupts(nic);
	nic_disable_msix(nic);
	return ret;
}

static void nic_unregister_interrupts(struct nicpf *nic)
{
	nic_free_all_interrupts(nic);
	nic_disable_msix(nic);
}

static int nic_num_sqs_en(struct nicpf *nic, int vf_en)
{
	int pos, sqs_per_vf = MAX_SQS_PER_VF_SINGLE_NODE;
	u16 total_vf;

	/* Secondary Qsets are needed only if CPU count is
	 * morethan MAX_QUEUES_PER_QSET.
	 */
	if (num_online_cpus() <= MAX_QUEUES_PER_QSET)
		return 0;

	/* Check if its a multi-node environment */
	if (nr_node_ids > 1)
		sqs_per_vf = MAX_SQS_PER_VF;

	pos = pci_find_ext_capability(nic->pdev, PCI_EXT_CAP_ID_SRIOV);
	pci_read_config_word(nic->pdev, (pos + PCI_SRIOV_TOTAL_VF), &total_vf);
	return min(total_vf - vf_en, vf_en * sqs_per_vf);
}

static int nic_sriov_init(struct pci_dev *pdev, struct nicpf *nic)
{
	int pos = 0;
	int vf_en;
	int err;
	u16 total_vf_cnt;

	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
	if (!pos) {
		dev_err(&pdev->dev, "SRIOV capability is not found in PCIe config space\n");
		return -ENODEV;
	}

	pci_read_config_word(pdev, (pos + PCI_SRIOV_TOTAL_VF), &total_vf_cnt);
	if (total_vf_cnt < nic->num_vf_en)
		nic->num_vf_en = total_vf_cnt;

	if (!total_vf_cnt)
		return 0;

	vf_en = nic->num_vf_en;
	nic->num_sqs_en = nic_num_sqs_en(nic, nic->num_vf_en);
	vf_en += nic->num_sqs_en;

	err = pci_enable_sriov(pdev, vf_en);
	if (err) {
		dev_err(&pdev->dev, "SRIOV enable failed, num VF is %d\n",
			vf_en);
		nic->num_vf_en = 0;
		return err;
	}

	dev_info(&pdev->dev, "SRIOV enabled, number of VF available %d\n",
		 vf_en);

	nic->flags |= NIC_SRIOV_ENABLED;
	return 0;
}

/* Poll for BGX LMAC link status and update corresponding VF
 * if there is a change, valid only if internal L2 switch
 * is not present otherwise VF link is always treated as up
 */
static void nic_poll_for_link(struct work_struct *work)
{
	union nic_mbx mbx = {};
	struct nicpf *nic;
	struct bgx_link_status link;
	u8 vf, bgx, lmac;

	nic = container_of(work, struct nicpf, dwork.work);

	mbx.link_status.msg = NIC_MBOX_MSG_BGX_LINK_CHANGE;

	for (vf = 0; vf < nic->num_vf_en; vf++) {
		/* Poll only if VF is UP */
		if (!nic->vf_enabled[vf])
			continue;

		/* Get BGX, LMAC indices for the VF */
		bgx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]);
		lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]);
		/* Get interface link status */
		bgx_get_lmac_link_state(nic->node, bgx, lmac, &link);

		/* Inform VF only if link status changed */
		if (nic->link[vf] == link.link_up)
			continue;

		if (!nic->mbx_lock[vf]) {
			nic->link[vf] = link.link_up;
			nic->duplex[vf] = link.duplex;
			nic->speed[vf] = link.speed;

			/* Send a mbox message to VF with current link status */
			mbx.link_status.link_up = link.link_up;
			mbx.link_status.duplex = link.duplex;
			mbx.link_status.speed = link.speed;
			nic_send_msg_to_vf(nic, vf, &mbx);
		}
	}
	queue_delayed_work(nic->check_link, &nic->dwork, HZ * 2);
}

static int nic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	struct device *dev = &pdev->dev;
	struct nicpf *nic;
	int    err;

	BUILD_BUG_ON(sizeof(union nic_mbx) > 16);

	nic = devm_kzalloc(dev, sizeof(*nic), GFP_KERNEL);
	if (!nic)
		return -ENOMEM;

	nic->hw = devm_kzalloc(dev, sizeof(struct hw_info), GFP_KERNEL);
	if (!nic->hw) {
		devm_kfree(dev, nic);
		return -ENOMEM;
	}

	pci_set_drvdata(pdev, nic);

	nic->pdev = pdev;

	err = pci_enable_device(pdev);
	if (err) {
		dev_err(dev, "Failed to enable PCI device\n");
		pci_set_drvdata(pdev, NULL);
		return err;
	}

	err = pci_request_regions(pdev, DRV_NAME);
	if (err) {
		dev_err(dev, "PCI request regions failed 0x%x\n", err);
		goto err_disable_device;
	}

	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(48));
	if (err) {
		dev_err(dev, "Unable to get usable DMA configuration\n");
		goto err_release_regions;
	}

	err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(48));
	if (err) {
		dev_err(dev, "Unable to get 48-bit DMA for consistent allocations\n");
		goto err_release_regions;
	}

	/* MAP PF's configuration registers */
	nic->reg_base = pcim_iomap(pdev, PCI_CFG_REG_BAR_NUM, 0);
	if (!nic->reg_base) {
		dev_err(dev, "Cannot map config register space, aborting\n");
		err = -ENOMEM;
		goto err_release_regions;
	}

	nic->node = nic_get_node_id(pdev);

	/* Initialize hardware */
	nic_init_hw(nic);

	nic_set_lmac_vf_mapping(nic);

	/* Register interrupts */
	err = nic_register_interrupts(nic);
	if (err)
		goto err_release_regions;

	/* Configure SRIOV */
	err = nic_sriov_init(pdev, nic);
	if (err)
		goto err_unregister_interrupts;

	/* Register a physical link status poll fn() */
	nic->check_link = alloc_workqueue("check_link_status",
					  WQ_UNBOUND | WQ_MEM_RECLAIM, 1);
	if (!nic->check_link) {
		err = -ENOMEM;
		goto err_disable_sriov;
	}

	INIT_DELAYED_WORK(&nic->dwork, nic_poll_for_link);
	queue_delayed_work(nic->check_link, &nic->dwork, 0);

	return 0;

err_disable_sriov:
	if (nic->flags & NIC_SRIOV_ENABLED)
		pci_disable_sriov(pdev);
err_unregister_interrupts:
	nic_unregister_interrupts(nic);
err_release_regions:
	pci_release_regions(pdev);
err_disable_device:
	devm_kfree(dev, nic->hw);
	devm_kfree(dev, nic);
	pci_disable_device(pdev);
	pci_set_drvdata(pdev, NULL);
	return err;
}

static void nic_remove(struct pci_dev *pdev)
{
	struct nicpf *nic = pci_get_drvdata(pdev);

	if (nic->flags & NIC_SRIOV_ENABLED)
		pci_disable_sriov(pdev);

	if (nic->check_link) {
		/* Destroy work Queue */
		cancel_delayed_work_sync(&nic->dwork);
		destroy_workqueue(nic->check_link);
	}

	nic_unregister_interrupts(nic);
	pci_release_regions(pdev);

	devm_kfree(&pdev->dev, nic->hw);
	devm_kfree(&pdev->dev, nic);

	pci_disable_device(pdev);
	pci_set_drvdata(pdev, NULL);
}

static struct pci_driver nic_driver = {
	.name = DRV_NAME,
	.id_table = nic_id_table,
	.probe = nic_probe,
	.remove = nic_remove,
};

static int __init nic_init_module(void)
{
	pr_info("%s, ver %s\n", DRV_NAME, DRV_VERSION);

	return pci_register_driver(&nic_driver);
}

static void __exit nic_cleanup_module(void)
{
	pci_unregister_driver(&nic_driver);
}

module_init(nic_init_module);
module_exit(nic_cleanup_module);