// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2015-2019 Netronome Systems, Inc. */

/*
 * nfp_net_common.c
 * Netronome network device driver: Common functions between PF and VF
 * Authors: Jakub Kicinski <jakub.kicinski@netronome.com>
 *          Jason McMullan <jason.mcmullan@netronome.com>
 *          Rolf Neugebauer <rolf.neugebauer@netronome.com>
 *          Brad Petrus <brad.petrus@netronome.com>
 *          Chris Telfer <chris.telfer@netronome.com>
 */

#include <linux/bitfield.h>
#include <linux/bpf.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/interrupt.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/mm.h>
#include <linux/overflow.h>
#include <linux/page_ref.h>
#include <linux/pci.h>
#include <linux/pci_regs.h>
#include <linux/ethtool.h>
#include <linux/log2.h>
#include <linux/if_vlan.h>
#include <linux/if_bridge.h>
#include <linux/random.h>
#include <linux/vmalloc.h>
#include <linux/ktime.h>

#include <net/tls.h>
#include <net/vxlan.h>
#include <net/xdp_sock_drv.h>
#include <net/xfrm.h>

#include "nfpcore/nfp_dev.h"
#include "nfpcore/nfp_nsp.h"
#include "ccm.h"
#include "nfp_app.h"
#include "nfp_net_ctrl.h"
#include "nfp_net.h"
#include "nfp_net_dp.h"
#include "nfp_net_sriov.h"
#include "nfp_net_xsk.h"
#include "nfp_port.h"
#include "crypto/crypto.h"
#include "crypto/fw.h"

static int nfp_net_mc_unsync(struct net_device *netdev, const unsigned char *addr);

/**
 * nfp_net_get_fw_version() - Read and parse the FW version
 * @fw_ver:     Output fw_version structure to read to
 * @ctrl_bar:   Mapped address of the control BAR
 */
void nfp_net_get_fw_version(struct nfp_net_fw_version *fw_ver,
                            void __iomem *ctrl_bar)
{
        u32 reg;

        reg = readl(ctrl_bar + NFP_NET_CFG_VERSION);
        put_unaligned_le32(reg, fw_ver);
}

u32 nfp_qcp_queue_offset(const struct nfp_dev_info *dev_info, u16 queue)
{
        queue &= dev_info->qc_idx_mask;
        return dev_info->qc_addr_offset + NFP_QCP_QUEUE_ADDR_SZ * queue;
}

/* Firmware reconfig
 *
 * Firmware reconfig may take a while so we have two versions of it -
 * synchronous and asynchronous (posted).  All synchronous callers are holding
 * RTNL so we don't have to worry about serializing them.
 */
static void nfp_net_reconfig_start(struct nfp_net *nn, u32 update)
{
        nn_writel(nn, NFP_NET_CFG_UPDATE, update);
        /* ensure update is written before pinging HW */
        nn_pci_flush(nn);
        nfp_qcp_wr_ptr_add(nn->qcp_cfg, 1);
        nn->reconfig_in_progress_update = update;
}

/* Pass 0 as update to run posted reconfigs. */
static void nfp_net_reconfig_start_async(struct nfp_net *nn, u32 update)
{
        update |= nn->reconfig_posted;
        nn->reconfig_posted = 0;

        nfp_net_reconfig_start(nn, update);

        nn->reconfig_timer_active = true;
        mod_timer(&nn->reconfig_timer, jiffies + NFP_NET_POLL_TIMEOUT * HZ);
}

static bool nfp_net_reconfig_check_done(struct nfp_net *nn, bool last_check)
{
        u32 reg;

        reg = nn_readl(nn, NFP_NET_CFG_UPDATE);
        if (reg == 0)
                return true;
        if (reg & NFP_NET_CFG_UPDATE_ERR) {
                nn_err(nn, "Reconfig error (status: 0x%08x update: 0x%08x ctrl: 0x%08x)\n",
                       reg, nn->reconfig_in_progress_update,
                       nn_readl(nn, NFP_NET_CFG_CTRL));
                return true;
        } else if (last_check) {
                nn_err(nn, "Reconfig timeout (status: 0x%08x update: 0x%08x ctrl: 0x%08x)\n",
                       reg, nn->reconfig_in_progress_update,
                       nn_readl(nn, NFP_NET_CFG_CTRL));
                return true;
        }

        return false;
}

static bool __nfp_net_reconfig_wait(struct nfp_net *nn, unsigned long deadline)
{
        bool timed_out = false;
        int i;

        /* Poll update field, waiting for NFP to ack the config.
         * Do an opportunistic wait-busy loop, afterward sleep.
         */
        for (i = 0; i < 50; i++) {
                if (nfp_net_reconfig_check_done(nn, false))
                        return false;
                udelay(4);
        }

        while (!nfp_net_reconfig_check_done(nn, timed_out)) {
                usleep_range(250, 500);
                timed_out = time_is_before_eq_jiffies(deadline);
        }

        return timed_out;
}

static int nfp_net_reconfig_wait(struct nfp_net *nn, unsigned long deadline)
{
        if (__nfp_net_reconfig_wait(nn, deadline))
                return -EIO;

        if (nn_readl(nn, NFP_NET_CFG_UPDATE) & NFP_NET_CFG_UPDATE_ERR)
                return -EIO;

        return 0;
}

static void nfp_net_reconfig_timer(struct timer_list *t)
{
        struct nfp_net *nn = timer_container_of(nn, t, reconfig_timer);

        spin_lock_bh(&nn->reconfig_lock);

        nn->reconfig_timer_active = false;

        /* If sync caller is present it will take over from us */
        if (nn->reconfig_sync_present)
                goto done;

        /* Read reconfig status and report errors */
        nfp_net_reconfig_check_done(nn, true);

        if (nn->reconfig_posted)
                nfp_net_reconfig_start_async(nn, 0);
done:
        spin_unlock_bh(&nn->reconfig_lock);
}

/**
 * nfp_net_reconfig_post() - Post async reconfig request
 * @nn:      NFP Net device to reconfigure
 * @update:  The value for the update field in the BAR config
 *
 * Record FW reconfiguration request.  Reconfiguration will be kicked off
 * whenever reconfiguration machinery is idle.  Multiple requests can be
 * merged together!
 */
static void nfp_net_reconfig_post(struct nfp_net *nn, u32 update)
{
        spin_lock_bh(&nn->reconfig_lock);

        /* Sync caller will kick off async reconf when it's done, just post */
        if (nn->reconfig_sync_present) {
                nn->reconfig_posted |= update;
                goto done;
        }

        /* Opportunistically check if the previous command is done */
        if (!nn->reconfig_timer_active ||
            nfp_net_reconfig_check_done(nn, false))
                nfp_net_reconfig_start_async(nn, update);
        else
                nn->reconfig_posted |= update;
done:
        spin_unlock_bh(&nn->reconfig_lock);
}

static void nfp_net_reconfig_sync_enter(struct nfp_net *nn)
{
        bool cancelled_timer = false;
        u32 pre_posted_requests;

        spin_lock_bh(&nn->reconfig_lock);

        WARN_ON(nn->reconfig_sync_present);
        nn->reconfig_sync_present = true;

        if (nn->reconfig_timer_active) {
                nn->reconfig_timer_active = false;
                cancelled_timer = true;
        }
        pre_posted_requests = nn->reconfig_posted;
        nn->reconfig_posted = 0;

        spin_unlock_bh(&nn->reconfig_lock);

        if (cancelled_timer) {
                timer_delete_sync(&nn->reconfig_timer);
                nfp_net_reconfig_wait(nn, nn->reconfig_timer.expires);
        }

        /* Run the posted reconfigs which were issued before we started */
        if (pre_posted_requests) {
                nfp_net_reconfig_start(nn, pre_posted_requests);
                nfp_net_reconfig_wait(nn, jiffies + HZ * NFP_NET_POLL_TIMEOUT);
        }
}

static void nfp_net_reconfig_wait_posted(struct nfp_net *nn)
{
        nfp_net_reconfig_sync_enter(nn);

        spin_lock_bh(&nn->reconfig_lock);
        nn->reconfig_sync_present = false;
        spin_unlock_bh(&nn->reconfig_lock);
}

/**
 * __nfp_net_reconfig() - Reconfigure the firmware
 * @nn:      NFP Net device to reconfigure
 * @update:  The value for the update field in the BAR config
 *
 * Write the update word to the BAR and ping the reconfig queue.  The
 * poll until the firmware has acknowledged the update by zeroing the
 * update word.
 *
 * Return: Negative errno on error, 0 on success
 */
int __nfp_net_reconfig(struct nfp_net *nn, u32 update)
{
        int ret;

        nfp_net_reconfig_sync_enter(nn);

        nfp_net_reconfig_start(nn, update);
        ret = nfp_net_reconfig_wait(nn, jiffies + HZ * NFP_NET_POLL_TIMEOUT);

        spin_lock_bh(&nn->reconfig_lock);

        if (nn->reconfig_posted)
                nfp_net_reconfig_start_async(nn, 0);

        nn->reconfig_sync_present = false;

        spin_unlock_bh(&nn->reconfig_lock);

        return ret;
}

int nfp_net_reconfig(struct nfp_net *nn, u32 update)
{
        int ret;

        nn_ctrl_bar_lock(nn);
        ret = __nfp_net_reconfig(nn, update);
        nn_ctrl_bar_unlock(nn);

        return ret;
}

int nfp_net_mbox_lock(struct nfp_net *nn, unsigned int data_size)
{
        if (nn->tlv_caps.mbox_len < NFP_NET_CFG_MBOX_SIMPLE_VAL + data_size) {
                nn_err(nn, "mailbox too small for %u of data (%u)\n",
                       data_size, nn->tlv_caps.mbox_len);
                return -EIO;
        }

        nn_ctrl_bar_lock(nn);
        return 0;
}

/**
 * nfp_net_mbox_reconfig() - Reconfigure the firmware via the mailbox
 * @nn:        NFP Net device to reconfigure
 * @mbox_cmd:  The value for the mailbox command
 *
 * Helper function for mailbox updates
 *
 * Return: Negative errno on error, 0 on success
 */
int nfp_net_mbox_reconfig(struct nfp_net *nn, u32 mbox_cmd)
{
        u32 mbox = nn->tlv_caps.mbox_off;
        int ret;

        nn_writeq(nn, mbox + NFP_NET_CFG_MBOX_SIMPLE_CMD, mbox_cmd);

        ret = __nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_MBOX);
        if (ret) {
                nn_err(nn, "Mailbox update error\n");
                return ret;
        }

        return -nn_readl(nn, mbox + NFP_NET_CFG_MBOX_SIMPLE_RET);
}

void nfp_net_mbox_reconfig_post(struct nfp_net *nn, u32 mbox_cmd)
{
        u32 mbox = nn->tlv_caps.mbox_off;

        nn_writeq(nn, mbox + NFP_NET_CFG_MBOX_SIMPLE_CMD, mbox_cmd);

        nfp_net_reconfig_post(nn, NFP_NET_CFG_UPDATE_MBOX);
}

int nfp_net_mbox_reconfig_wait_posted(struct nfp_net *nn)
{
        u32 mbox = nn->tlv_caps.mbox_off;

        nfp_net_reconfig_wait_posted(nn);

        return -nn_readl(nn, mbox + NFP_NET_CFG_MBOX_SIMPLE_RET);
}

int nfp_net_mbox_reconfig_and_unlock(struct nfp_net *nn, u32 mbox_cmd)
{
        int ret;

        ret = nfp_net_mbox_reconfig(nn, mbox_cmd);
        nn_ctrl_bar_unlock(nn);
        return ret;
}

/* Interrupt configuration and handling
 */

/**
 * nfp_net_irqs_alloc() - allocates MSI-X irqs
 * @pdev:        PCI device structure
 * @irq_entries: Array to be initialized and used to hold the irq entries
 * @min_irqs:    Minimal acceptable number of interrupts
 * @wanted_irqs: Target number of interrupts to allocate
 *
 * Return: Number of irqs obtained or 0 on error.
 */
unsigned int
nfp_net_irqs_alloc(struct pci_dev *pdev, struct msix_entry *irq_entries,
                   unsigned int min_irqs, unsigned int wanted_irqs)
{
        unsigned int i;
        int got_irqs;

        for (i = 0; i < wanted_irqs; i++)
                irq_entries[i].entry = i;

        got_irqs = pci_enable_msix_range(pdev, irq_entries,
                                         min_irqs, wanted_irqs);
        if (got_irqs < 0) {
                dev_err(&pdev->dev, "Failed to enable %d-%d MSI-X (err=%d)\n",
                        min_irqs, wanted_irqs, got_irqs);
                return 0;
        }

        if (got_irqs < wanted_irqs)
                dev_warn(&pdev->dev, "Unable to allocate %d IRQs got only %d\n",
                         wanted_irqs, got_irqs);

        return got_irqs;
}

/**
 * nfp_net_irqs_assign() - Assign interrupts allocated externally to netdev
 * @nn:          NFP Network structure
 * @irq_entries: Table of allocated interrupts
 * @n:           Size of @irq_entries (number of entries to grab)
 *
 * After interrupts are allocated with nfp_net_irqs_alloc() this function
 * should be called to assign them to a specific netdev (port).
 */
void
nfp_net_irqs_assign(struct nfp_net *nn, struct msix_entry *irq_entries,
                    unsigned int n)
{
        struct nfp_net_dp *dp = &nn->dp;

        nn->max_r_vecs = n - NFP_NET_NON_Q_VECTORS;
        dp->num_r_vecs = nn->max_r_vecs;

        memcpy(nn->irq_entries, irq_entries, sizeof(*irq_entries) * n);

        if (dp->num_rx_rings > dp->num_r_vecs ||
            dp->num_tx_rings > dp->num_r_vecs)
                dev_warn(nn->dp.dev, "More rings (%d,%d) than vectors (%d).\n",
                         dp->num_rx_rings, dp->num_tx_rings,
                         dp->num_r_vecs);

        dp->num_rx_rings = min(dp->num_r_vecs, dp->num_rx_rings);
        dp->num_tx_rings = min(dp->num_r_vecs, dp->num_tx_rings);
        dp->num_stack_tx_rings = dp->num_tx_rings;
}

/**
 * nfp_net_irqs_disable() - Disable interrupts
 * @pdev:        PCI device structure
 *
 * Undoes what @nfp_net_irqs_alloc() does.
 */
void nfp_net_irqs_disable(struct pci_dev *pdev)
{
        pci_disable_msix(pdev);
}

/**
 * nfp_net_irq_rxtx() - Interrupt service routine for RX/TX rings.
 * @irq:      Interrupt
 * @data:     Opaque data structure
 *
 * Return: Indicate if the interrupt has been handled.
 */
static irqreturn_t nfp_net_irq_rxtx(int irq, void *data)
{
        struct nfp_net_r_vector *r_vec = data;

        /* Currently we cannot tell if it's a rx or tx interrupt,
         * since dim does not need accurate event_ctr to calculate,
         * we just use this counter for both rx and tx dim.
         */
        r_vec->event_ctr++;

        napi_schedule_irqoff(&r_vec->napi);

        /* The FW auto-masks any interrupt, either via the MASK bit in
         * the MSI-X table or via the per entry ICR field.  So there
         * is no need to disable interrupts here.
         */
        return IRQ_HANDLED;
}

static irqreturn_t nfp_ctrl_irq_rxtx(int irq, void *data)
{
        struct nfp_net_r_vector *r_vec = data;

        tasklet_schedule(&r_vec->tasklet);

        return IRQ_HANDLED;
}

/**
 * nfp_net_read_link_status() - Reread link status from control BAR
 * @nn:       NFP Network structure
 */
static void nfp_net_read_link_status(struct nfp_net *nn)
{
        unsigned long flags;
        bool link_up;
        u16 sts;

        spin_lock_irqsave(&nn->link_status_lock, flags);

        sts = nn_readw(nn, NFP_NET_CFG_STS);
        link_up = !!(sts & NFP_NET_CFG_STS_LINK);

        if (nn->link_up == link_up)
                goto out;

        nn->link_up = link_up;
        if (nn->port) {
                set_bit(NFP_PORT_CHANGED, &nn->port->flags);
                if (nn->port->link_cb)
                        nn->port->link_cb(nn->port);
        }

        if (nn->link_up) {
                netif_carrier_on(nn->dp.netdev);
                netdev_info(nn->dp.netdev, "NIC Link is Up\n");
        } else {
                netif_carrier_off(nn->dp.netdev);
                netdev_info(nn->dp.netdev, "NIC Link is Down\n");
        }
out:
        spin_unlock_irqrestore(&nn->link_status_lock, flags);
}

/**
 * nfp_net_irq_lsc() - Interrupt service routine for link state changes
 * @irq:      Interrupt
 * @data:     Opaque data structure
 *
 * Return: Indicate if the interrupt has been handled.
 */
static irqreturn_t nfp_net_irq_lsc(int irq, void *data)
{
        struct nfp_net *nn = data;
        struct msix_entry *entry;

        entry = &nn->irq_entries[NFP_NET_IRQ_LSC_IDX];

        nfp_net_read_link_status(nn);

        nfp_net_irq_unmask(nn, entry->entry);

        return IRQ_HANDLED;
}

/**
 * nfp_net_irq_exn() - Interrupt service routine for exceptions
 * @irq:      Interrupt
 * @data:     Opaque data structure
 *
 * Return: Indicate if the interrupt has been handled.
 */
static irqreturn_t nfp_net_irq_exn(int irq, void *data)
{
        struct nfp_net *nn = data;

        nn_err(nn, "%s: UNIMPLEMENTED.\n", __func__);
        /* XXX TO BE IMPLEMENTED */
        return IRQ_HANDLED;
}

/**
 * nfp_net_aux_irq_request() - Request an auxiliary interrupt (LSC or EXN)
 * @nn:         NFP Network structure
 * @ctrl_offset: Control BAR offset where IRQ configuration should be written
 * @format:     printf-style format to construct the interrupt name
 * @name:       Pointer to allocated space for interrupt name
 * @name_sz:    Size of space for interrupt name
 * @vector_idx: Index of MSI-X vector used for this interrupt
 * @handler:    IRQ handler to register for this interrupt
 */
static int
nfp_net_aux_irq_request(struct nfp_net *nn, u32 ctrl_offset,
                        const char *format, char *name, size_t name_sz,
                        unsigned int vector_idx, irq_handler_t handler)
{
        struct msix_entry *entry;
        int err;

        entry = &nn->irq_entries[vector_idx];

        snprintf(name, name_sz, format, nfp_net_name(nn));
        err = request_irq(entry->vector, handler, 0, name, nn);
        if (err) {
                nn_err(nn, "Failed to request IRQ %d (err=%d).\n",
                       entry->vector, err);
                return err;
        }
        nn_writeb(nn, ctrl_offset, entry->entry);
        nfp_net_irq_unmask(nn, entry->entry);

        return 0;
}

/**
 * nfp_net_aux_irq_free() - Free an auxiliary interrupt (LSC or EXN)
 * @nn:         NFP Network structure
 * @ctrl_offset: Control BAR offset where IRQ configuration should be written
 * @vector_idx: Index of MSI-X vector used for this interrupt
 */
static void nfp_net_aux_irq_free(struct nfp_net *nn, u32 ctrl_offset,
                                 unsigned int vector_idx)
{
        nn_writeb(nn, ctrl_offset, 0xff);
        nn_pci_flush(nn);
        free_irq(nn->irq_entries[vector_idx].vector, nn);
}

struct sk_buff *
nfp_net_tls_tx(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
               struct sk_buff *skb, u64 *tls_handle, int *nr_frags)
{
#ifdef CONFIG_TLS_DEVICE
        struct nfp_net_tls_offload_ctx *ntls;
        struct sk_buff *nskb;
        bool resync_pending;
        u32 datalen, seq;

        if (likely(!dp->ktls_tx))
                return skb;
        if (!tls_is_skb_tx_device_offloaded(skb))
                return skb;

        datalen = skb->len - skb_tcp_all_headers(skb);
        seq = ntohl(tcp_hdr(skb)->seq);
        ntls = tls_driver_ctx(skb->sk, TLS_OFFLOAD_CTX_DIR_TX);
        resync_pending = tls_offload_tx_resync_pending(skb->sk);
        if (unlikely(resync_pending || ntls->next_seq != seq)) {
                /* Pure ACK out of order already */
                if (!datalen)
                        return skb;

                u64_stats_update_begin(&r_vec->tx_sync);
                r_vec->tls_tx_fallback++;
                u64_stats_update_end(&r_vec->tx_sync);

                nskb = tls_encrypt_skb(skb);
                if (!nskb) {
                        u64_stats_update_begin(&r_vec->tx_sync);
                        r_vec->tls_tx_no_fallback++;
                        u64_stats_update_end(&r_vec->tx_sync);
                        return NULL;
                }
                /* encryption wasn't necessary */
                if (nskb == skb)
                        return skb;
                /* we don't re-check ring space */
                if (unlikely(skb_is_nonlinear(nskb))) {
                        nn_dp_warn(dp, "tls_encrypt_skb() produced fragmented frame\n");
                        u64_stats_update_begin(&r_vec->tx_sync);
                        r_vec->tx_errors++;
                        u64_stats_update_end(&r_vec->tx_sync);
                        dev_kfree_skb_any(nskb);
                        return NULL;
                }

                /* jump forward, a TX may have gotten lost, need to sync TX */
                if (!resync_pending && seq - ntls->next_seq < U32_MAX / 4)
                        tls_offload_tx_resync_request(nskb->sk, seq,
                                                      ntls->next_seq);

                *nr_frags = 0;
                return nskb;
        }

        if (datalen) {
                u64_stats_update_begin(&r_vec->tx_sync);
                if (!skb_is_gso(skb))
                        r_vec->hw_tls_tx++;
                else
                        r_vec->hw_tls_tx += skb_shinfo(skb)->gso_segs;
                u64_stats_update_end(&r_vec->tx_sync);
        }

        memcpy(tls_handle, ntls->fw_handle, sizeof(ntls->fw_handle));
        ntls->next_seq += datalen;
#endif
        return skb;
}

void nfp_net_tls_tx_undo(struct sk_buff *skb, u64 tls_handle)
{
#ifdef CONFIG_TLS_DEVICE
        struct nfp_net_tls_offload_ctx *ntls;
        u32 datalen, seq;

        if (!tls_handle)
                return;
        if (WARN_ON_ONCE(!tls_is_skb_tx_device_offloaded(skb)))
                return;

        datalen = skb->len - skb_tcp_all_headers(skb);
        seq = ntohl(tcp_hdr(skb)->seq);

        ntls = tls_driver_ctx(skb->sk, TLS_OFFLOAD_CTX_DIR_TX);
        if (ntls->next_seq == seq + datalen)
                ntls->next_seq = seq;
        else
                WARN_ON_ONCE(1);
#endif
}

static void nfp_net_tx_timeout(struct net_device *netdev, unsigned int txqueue)
{
        struct nfp_net *nn = netdev_priv(netdev);

        nn_warn(nn, "TX watchdog timeout on ring: %u\n", txqueue);
}

/* Receive processing */
static unsigned int
nfp_net_calc_fl_bufsz_data(struct nfp_net_dp *dp)
{
        unsigned int fl_bufsz = 0;

        if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
                fl_bufsz += NFP_NET_MAX_PREPEND;
        else
                fl_bufsz += dp->rx_offset;
        fl_bufsz += ETH_HLEN + VLAN_HLEN * 2 + dp->mtu;

        return fl_bufsz;
}

static unsigned int nfp_net_calc_fl_bufsz(struct nfp_net_dp *dp)
{
        unsigned int fl_bufsz;

        fl_bufsz = NFP_NET_RX_BUF_HEADROOM;
        fl_bufsz += dp->rx_dma_off;
        fl_bufsz += nfp_net_calc_fl_bufsz_data(dp);

        fl_bufsz = SKB_DATA_ALIGN(fl_bufsz);
        fl_bufsz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));

        return fl_bufsz;
}

static unsigned int nfp_net_calc_fl_bufsz_xsk(struct nfp_net_dp *dp)
{
        unsigned int fl_bufsz;

        fl_bufsz = XDP_PACKET_HEADROOM;
        fl_bufsz += nfp_net_calc_fl_bufsz_data(dp);

        return fl_bufsz;
}

/* Setup and Configuration
 */

/**
 * nfp_net_vecs_init() - Assign IRQs and setup rvecs.
 * @nn:         NFP Network structure
 */
static void nfp_net_vecs_init(struct nfp_net *nn)
{
        int numa_node = dev_to_node(&nn->pdev->dev);
        struct nfp_net_r_vector *r_vec;
        unsigned int r;

        nn->lsc_handler = nfp_net_irq_lsc;
        nn->exn_handler = nfp_net_irq_exn;

        for (r = 0; r < nn->max_r_vecs; r++) {
                struct msix_entry *entry;

                entry = &nn->irq_entries[NFP_NET_NON_Q_VECTORS + r];

                r_vec = &nn->r_vecs[r];
                r_vec->nfp_net = nn;
                r_vec->irq_entry = entry->entry;
                r_vec->irq_vector = entry->vector;

                if (nn->dp.netdev) {
                        r_vec->handler = nfp_net_irq_rxtx;
                } else {
                        r_vec->handler = nfp_ctrl_irq_rxtx;

                        __skb_queue_head_init(&r_vec->queue);
                        spin_lock_init(&r_vec->lock);
                        tasklet_setup(&r_vec->tasklet, nn->dp.ops->ctrl_poll);
                        tasklet_disable(&r_vec->tasklet);
                }

                cpumask_set_cpu(cpumask_local_spread(r, numa_node), &r_vec->affinity_mask);
        }
}

static void
nfp_net_napi_add(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, int idx)
{
        if (dp->netdev)
                netif_napi_add(dp->netdev, &r_vec->napi,
                               nfp_net_has_xsk_pool_slow(dp, idx) ? dp->ops->xsk_poll : dp->ops->poll);
        else
                tasklet_enable(&r_vec->tasklet);
}

static void
nfp_net_napi_del(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec)
{
        if (dp->netdev)
                netif_napi_del(&r_vec->napi);
        else
                tasklet_disable(&r_vec->tasklet);
}

static void
nfp_net_vector_assign_rings(struct nfp_net_dp *dp,
                            struct nfp_net_r_vector *r_vec, int idx)
{
        r_vec->rx_ring = idx < dp->num_rx_rings ? &dp->rx_rings[idx] : NULL;
        r_vec->tx_ring =
                idx < dp->num_stack_tx_rings ? &dp->tx_rings[idx] : NULL;

        r_vec->xdp_ring = idx < dp->num_tx_rings - dp->num_stack_tx_rings ?
                &dp->tx_rings[dp->num_stack_tx_rings + idx] : NULL;

        if (nfp_net_has_xsk_pool_slow(dp, idx) || r_vec->xsk_pool) {
                r_vec->xsk_pool = dp->xdp_prog ? dp->xsk_pools[idx] : NULL;

                if (r_vec->xsk_pool)
                        xsk_pool_set_rxq_info(r_vec->xsk_pool,
                                              &r_vec->rx_ring->xdp_rxq);

                nfp_net_napi_del(dp, r_vec);
                nfp_net_napi_add(dp, r_vec, idx);
        }
}

static int
nfp_net_prepare_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
                       int idx)
{
        int err;

        nfp_net_napi_add(&nn->dp, r_vec, idx);

        snprintf(r_vec->name, sizeof(r_vec->name),
                 "%s-rxtx-%d", nfp_net_name(nn), idx);
        err = request_irq(r_vec->irq_vector, r_vec->handler, IRQF_NO_AUTOEN,
                          r_vec->name, r_vec);
        if (err) {
                nfp_net_napi_del(&nn->dp, r_vec);
                nn_err(nn, "Error requesting IRQ %d\n", r_vec->irq_vector);
                return err;
        }

        irq_update_affinity_hint(r_vec->irq_vector, &r_vec->affinity_mask);

        nn_dbg(nn, "RV%02d: irq=%03d/%03d\n", idx, r_vec->irq_vector,
               r_vec->irq_entry);

        return 0;
}

static void
nfp_net_cleanup_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec)
{
        irq_update_affinity_hint(r_vec->irq_vector, NULL);
        nfp_net_napi_del(&nn->dp, r_vec);
        free_irq(r_vec->irq_vector, r_vec);
}

/**
 * nfp_net_rss_write_itbl() - Write RSS indirection table to device
 * @nn:      NFP Net device to reconfigure
 */
void nfp_net_rss_write_itbl(struct nfp_net *nn)
{
        int i;

        for (i = 0; i < NFP_NET_CFG_RSS_ITBL_SZ; i += 4)
                nn_writel(nn, NFP_NET_CFG_RSS_ITBL + i,
                          get_unaligned_le32(nn->rss_itbl + i));
}

/**
 * nfp_net_rss_write_key() - Write RSS hash key to device
 * @nn:      NFP Net device to reconfigure
 */
void nfp_net_rss_write_key(struct nfp_net *nn)
{
        int i;

        for (i = 0; i < nfp_net_rss_key_sz(nn); i += 4)
                nn_writel(nn, NFP_NET_CFG_RSS_KEY + i,
                          get_unaligned_le32(nn->rss_key + i));
}

/**
 * nfp_net_coalesce_write_cfg() - Write irq coalescence configuration to HW
 * @nn:      NFP Net device to reconfigure
 */
void nfp_net_coalesce_write_cfg(struct nfp_net *nn)
{
        u8 i;
        u32 factor;
        u32 value;

        /* Compute factor used to convert coalesce '_usecs' parameters to
         * ME timestamp ticks.  There are 16 ME clock cycles for each timestamp
         * count.
         */
        factor = nn->tlv_caps.me_freq_mhz / 16;

        /* copy RX interrupt coalesce parameters */
        value = (nn->rx_coalesce_max_frames << 16) |
                (factor * nn->rx_coalesce_usecs);
        for (i = 0; i < nn->dp.num_rx_rings; i++)
                nn_writel(nn, NFP_NET_CFG_RXR_IRQ_MOD(i), value);

        /* copy TX interrupt coalesce parameters */
        value = (nn->tx_coalesce_max_frames << 16) |
                (factor * nn->tx_coalesce_usecs);
        for (i = 0; i < nn->dp.num_tx_rings; i++)
                nn_writel(nn, NFP_NET_CFG_TXR_IRQ_MOD(i), value);
}

/**
 * nfp_net_write_mac_addr() - Write mac address to the device control BAR
 * @nn:      NFP Net device to reconfigure
 * @addr:    MAC address to write
 *
 * Writes the MAC address from the netdev to the device control BAR.  Does not
 * perform the required reconfig.  We do a bit of byte swapping dance because
 * firmware is LE.
 */
static void nfp_net_write_mac_addr(struct nfp_net *nn, const u8 *addr)
{
        nn_writel(nn, NFP_NET_CFG_MACADDR + 0, get_unaligned_be32(addr));
        nn_writew(nn, NFP_NET_CFG_MACADDR + 6, get_unaligned_be16(addr + 4));
}

/**
 * nfp_net_clear_config_and_disable() - Clear control BAR and disable NFP
 * @nn:      NFP Net device to reconfigure
 *
 * Warning: must be fully idempotent.
 */
static void nfp_net_clear_config_and_disable(struct nfp_net *nn)
{
        u32 new_ctrl, new_ctrl_w1, update;
        unsigned int r;
        int err;

        new_ctrl = nn->dp.ctrl;
        new_ctrl &= ~NFP_NET_CFG_CTRL_ENABLE;
        update = NFP_NET_CFG_UPDATE_GEN;
        update |= NFP_NET_CFG_UPDATE_MSIX;
        update |= NFP_NET_CFG_UPDATE_RING;

        if (nn->cap & NFP_NET_CFG_CTRL_RINGCFG)
                new_ctrl &= ~NFP_NET_CFG_CTRL_RINGCFG;

        if (!(nn->cap_w1 & NFP_NET_CFG_CTRL_FREELIST_EN)) {
                nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, 0);
                nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, 0);
        }

        nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
        err = nfp_net_reconfig(nn, update);
        if (err)
                nn_err(nn, "Could not disable device: %d\n", err);

        if (nn->cap_w1 & NFP_NET_CFG_CTRL_FREELIST_EN) {
                new_ctrl_w1 = nn->dp.ctrl_w1;
                new_ctrl_w1 &= ~NFP_NET_CFG_CTRL_FREELIST_EN;
                nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, 0);
                nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, 0);

                nn_writel(nn, NFP_NET_CFG_CTRL_WORD1, new_ctrl_w1);
                err = nfp_net_reconfig(nn, update);
                if (err)
                        nn_err(nn, "Could not disable FREELIST_EN: %d\n", err);
                nn->dp.ctrl_w1 = new_ctrl_w1;
        }

        for (r = 0; r < nn->dp.num_rx_rings; r++) {
                nfp_net_rx_ring_reset(&nn->dp.rx_rings[r]);
                if (nfp_net_has_xsk_pool_slow(&nn->dp, nn->dp.rx_rings[r].idx))
                        nfp_net_xsk_rx_bufs_free(&nn->dp.rx_rings[r]);
        }
        for (r = 0; r < nn->dp.num_tx_rings; r++)
                nfp_net_tx_ring_reset(&nn->dp, &nn->dp.tx_rings[r]);
        for (r = 0; r < nn->dp.num_r_vecs; r++)
                nfp_net_vec_clear_ring_data(nn, r);

        nn->dp.ctrl = new_ctrl;
}

/**
 * nfp_net_set_config_and_enable() - Write control BAR and enable NFP
 * @nn:      NFP Net device to reconfigure
 */
static int nfp_net_set_config_and_enable(struct nfp_net *nn)
{
        u32 bufsz, new_ctrl, new_ctrl_w1, update = 0;
        unsigned int r;
        int err;

        new_ctrl = nn->dp.ctrl;
        new_ctrl_w1 = nn->dp.ctrl_w1;

        if (nn->dp.ctrl & NFP_NET_CFG_CTRL_RSS_ANY) {
                nfp_net_rss_write_key(nn);
                nfp_net_rss_write_itbl(nn);
                nn_writel(nn, NFP_NET_CFG_RSS_CTRL, nn->rss_cfg);
                update |= NFP_NET_CFG_UPDATE_RSS;
        }

        if (nn->dp.ctrl & NFP_NET_CFG_CTRL_IRQMOD) {
                nfp_net_coalesce_write_cfg(nn);
                update |= NFP_NET_CFG_UPDATE_IRQMOD;
        }

        for (r = 0; r < nn->dp.num_tx_rings; r++)
                nfp_net_tx_ring_hw_cfg_write(nn, &nn->dp.tx_rings[r], r);
        for (r = 0; r < nn->dp.num_rx_rings; r++)
                nfp_net_rx_ring_hw_cfg_write(nn, &nn->dp.rx_rings[r], r);

        nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE,
                  U64_MAX >> (64 - nn->dp.num_tx_rings));

        nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE,
                  U64_MAX >> (64 - nn->dp.num_rx_rings));

        if (nn->dp.netdev)
                nfp_net_write_mac_addr(nn, nn->dp.netdev->dev_addr);

        nn_writel(nn, NFP_NET_CFG_MTU, nn->dp.mtu);

        bufsz = nn->dp.fl_bufsz - nn->dp.rx_dma_off - NFP_NET_RX_BUF_NON_DATA;
        nn_writel(nn, NFP_NET_CFG_FLBUFSZ, bufsz);

        /* Enable device
         * Step 1: Replace the CTRL_ENABLE by NFP_NET_CFG_CTRL_FREELIST_EN if
         * FREELIST_EN exits.
         */
        if (nn->cap_w1 & NFP_NET_CFG_CTRL_FREELIST_EN)
                new_ctrl_w1 |= NFP_NET_CFG_CTRL_FREELIST_EN;
        else
                new_ctrl |= NFP_NET_CFG_CTRL_ENABLE;
        update |= NFP_NET_CFG_UPDATE_GEN;
        update |= NFP_NET_CFG_UPDATE_MSIX;
        update |= NFP_NET_CFG_UPDATE_RING;
        if (nn->cap & NFP_NET_CFG_CTRL_RINGCFG)
                new_ctrl |= NFP_NET_CFG_CTRL_RINGCFG;

        /* Step 2: Send the configuration and write the freelist.
         * - The freelist only need to be written once.
         */
        nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
        nn_writel(nn, NFP_NET_CFG_CTRL_WORD1, new_ctrl_w1);
        err = nfp_net_reconfig(nn, update);
        if (err) {
                nfp_net_clear_config_and_disable(nn);
                return err;
        }

        nn->dp.ctrl = new_ctrl;
        nn->dp.ctrl_w1 = new_ctrl_w1;

        for (r = 0; r < nn->dp.num_rx_rings; r++)
                nfp_net_rx_ring_fill_freelist(&nn->dp, &nn->dp.rx_rings[r]);

        /* Step 3: Do the NFP_NET_CFG_CTRL_ENABLE. Send the configuration.
         */
        if (nn->cap_w1 & NFP_NET_CFG_CTRL_FREELIST_EN) {
                new_ctrl |= NFP_NET_CFG_CTRL_ENABLE;
                nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);

                err = nfp_net_reconfig(nn, update);
                if (err) {
                        nfp_net_clear_config_and_disable(nn);
                        return err;
                }
                nn->dp.ctrl = new_ctrl;
        }

        return 0;
}

/**
 * nfp_net_close_stack() - Quiesce the stack (part of close)
 * @nn:      NFP Net device to reconfigure
 */
static void nfp_net_close_stack(struct nfp_net *nn)
{
        struct nfp_net_r_vector *r_vec;
        unsigned int r;

        disable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector);
        netif_carrier_off(nn->dp.netdev);
        nn->link_up = false;

        for (r = 0; r < nn->dp.num_r_vecs; r++) {
                r_vec = &nn->r_vecs[r];

                disable_irq(r_vec->irq_vector);
                napi_disable(&r_vec->napi);

                if (r_vec->rx_ring)
                        cancel_work_sync(&r_vec->rx_dim.work);

                if (r_vec->tx_ring)
                        cancel_work_sync(&r_vec->tx_dim.work);
        }

        netif_tx_disable(nn->dp.netdev);
}

/**
 * nfp_net_close_free_all() - Free all runtime resources
 * @nn:      NFP Net device to reconfigure
 */
static void nfp_net_close_free_all(struct nfp_net *nn)
{
        unsigned int r;

        nfp_net_tx_rings_free(&nn->dp);
        nfp_net_rx_rings_free(&nn->dp);

        for (r = 0; r < nn->dp.num_r_vecs; r++)
                nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);

        nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX);
        nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX);
}

/**
 * nfp_net_netdev_close() - Called when the device is downed
 * @netdev:      netdev structure
 */
static int nfp_net_netdev_close(struct net_device *netdev)
{
        struct nfp_net *nn = netdev_priv(netdev);

        /* Step 1: Disable RX and TX rings from the Linux kernel perspective
         */
        nfp_net_close_stack(nn);

        /* Step 2: Tell NFP
         */
        if (nn->cap_w1 & NFP_NET_CFG_CTRL_MCAST_FILTER)
                __dev_mc_unsync(netdev, nfp_net_mc_unsync);

        nfp_net_clear_config_and_disable(nn);
        nfp_port_configure(netdev, false);

        /* Step 3: Free resources
         */
        nfp_net_close_free_all(nn);

        nn_dbg(nn, "%s down", netdev->name);
        return 0;
}

void nfp_ctrl_close(struct nfp_net *nn)
{
        int r;

        rtnl_lock();

        for (r = 0; r < nn->dp.num_r_vecs; r++) {
                disable_irq(nn->r_vecs[r].irq_vector);
                tasklet_disable(&nn->r_vecs[r].tasklet);
        }

        nfp_net_clear_config_and_disable(nn);

        nfp_net_close_free_all(nn);

        rtnl_unlock();
}

static void nfp_net_rx_dim_work(struct work_struct *work)
{
        struct nfp_net_r_vector *r_vec;
        unsigned int factor, value;
        struct dim_cq_moder moder;
        struct nfp_net *nn;
        struct dim *dim;

        dim = container_of(work, struct dim, work);
        moder = net_dim_get_rx_moderation(dim->mode, dim->profile_ix);
        r_vec = container_of(dim, struct nfp_net_r_vector, rx_dim);
        nn = r_vec->nfp_net;

        /* Compute factor used to convert coalesce '_usecs' parameters to
         * ME timestamp ticks.  There are 16 ME clock cycles for each timestamp
         * count.
         */
        factor = nn->tlv_caps.me_freq_mhz / 16;
        if (nfp_net_coalesce_para_check(factor * moder.usec) ||
            nfp_net_coalesce_para_check(moder.pkts))
                return;

        /* copy RX interrupt coalesce parameters */
        value = (moder.pkts << 16) | (factor * moder.usec);
        nn_writel(nn, NFP_NET_CFG_RXR_IRQ_MOD(r_vec->rx_ring->idx), value);
        (void)nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_IRQMOD);

        dim->state = DIM_START_MEASURE;
}

static void nfp_net_tx_dim_work(struct work_struct *work)
{
        struct nfp_net_r_vector *r_vec;
        unsigned int factor, value;
        struct dim_cq_moder moder;
        struct nfp_net *nn;
        struct dim *dim;

        dim = container_of(work, struct dim, work);
        moder = net_dim_get_tx_moderation(dim->mode, dim->profile_ix);
        r_vec = container_of(dim, struct nfp_net_r_vector, tx_dim);
        nn = r_vec->nfp_net;

        /* Compute factor used to convert coalesce '_usecs' parameters to
         * ME timestamp ticks.  There are 16 ME clock cycles for each timestamp
         * count.
         */
        factor = nn->tlv_caps.me_freq_mhz / 16;
        if (nfp_net_coalesce_para_check(factor * moder.usec) ||
            nfp_net_coalesce_para_check(moder.pkts))
                return;

        /* copy TX interrupt coalesce parameters */
        value = (moder.pkts << 16) | (factor * moder.usec);
        nn_writel(nn, NFP_NET_CFG_TXR_IRQ_MOD(r_vec->tx_ring->idx), value);
        (void)nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_IRQMOD);

        dim->state = DIM_START_MEASURE;
}

/**
 * nfp_net_open_stack() - Start the device from stack's perspective
 * @nn:      NFP Net device to reconfigure
 */
static void nfp_net_open_stack(struct nfp_net *nn)
{
        struct nfp_net_r_vector *r_vec;
        unsigned int r;

        for (r = 0; r < nn->dp.num_r_vecs; r++) {
                r_vec = &nn->r_vecs[r];

                if (r_vec->rx_ring) {
                        INIT_WORK(&r_vec->rx_dim.work, nfp_net_rx_dim_work);
                        r_vec->rx_dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
                }

                if (r_vec->tx_ring) {
                        INIT_WORK(&r_vec->tx_dim.work, nfp_net_tx_dim_work);
                        r_vec->tx_dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
                }

                napi_enable(&r_vec->napi);
                enable_irq(r_vec->irq_vector);
        }

        netif_tx_wake_all_queues(nn->dp.netdev);

        enable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector);
        nfp_net_read_link_status(nn);
}

static int nfp_net_open_alloc_all(struct nfp_net *nn)
{
        int err, r;

        err = nfp_net_aux_irq_request(nn, NFP_NET_CFG_EXN, "%s-exn",
                                      nn->exn_name, sizeof(nn->exn_name),
                                      NFP_NET_IRQ_EXN_IDX, nn->exn_handler);
        if (err)
                return err;
        err = nfp_net_aux_irq_request(nn, NFP_NET_CFG_LSC, "%s-lsc",
                                      nn->lsc_name, sizeof(nn->lsc_name),
                                      NFP_NET_IRQ_LSC_IDX, nn->lsc_handler);
        if (err)
                goto err_free_exn;
        disable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector);

        for (r = 0; r < nn->dp.num_r_vecs; r++) {
                err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r);
                if (err)
                        goto err_cleanup_vec_p;
        }

        err = nfp_net_rx_rings_prepare(nn, &nn->dp);
        if (err)
                goto err_cleanup_vec;

        err = nfp_net_tx_rings_prepare(nn, &nn->dp);
        if (err)
                goto err_free_rx_rings;

        for (r = 0; r < nn->max_r_vecs; r++)
                nfp_net_vector_assign_rings(&nn->dp, &nn->r_vecs[r], r);

        return 0;

err_free_rx_rings:
        nfp_net_rx_rings_free(&nn->dp);
err_cleanup_vec:
        r = nn->dp.num_r_vecs;
err_cleanup_vec_p:
        while (r--)
                nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
        nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX);
err_free_exn:
        nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX);
        return err;
}

static int nfp_net_netdev_open(struct net_device *netdev)
{
        struct nfp_net *nn = netdev_priv(netdev);
        int err;

        /* Step 1: Allocate resources for rings and the like
         * - Request interrupts
         * - Allocate RX and TX ring resources
         * - Setup initial RSS table
         */
        err = nfp_net_open_alloc_all(nn);
        if (err)
                return err;

        err = netif_set_real_num_tx_queues(netdev, nn->dp.num_stack_tx_rings);
        if (err)
                goto err_free_all;

        err = netif_set_real_num_rx_queues(netdev, nn->dp.num_rx_rings);
        if (err)
                goto err_free_all;

        /* Step 2: Configure the NFP
         * - Ifup the physical interface if it exists
         * - Enable rings from 0 to tx_rings/rx_rings - 1.
         * - Write MAC address (in case it changed)
         * - Set the MTU
         * - Set the Freelist buffer size
         * - Enable the FW
         */
        err = nfp_port_configure(netdev, true);
        if (err)
                goto err_free_all;

        err = nfp_net_set_config_and_enable(nn);
        if (err)
                goto err_port_disable;

        /* Step 3: Enable for kernel
         * - put some freelist descriptors on each RX ring
         * - enable NAPI on each ring
         * - enable all TX queues
         * - set link state
         */
        nfp_net_open_stack(nn);

        return 0;

err_port_disable:
        nfp_port_configure(netdev, false);
err_free_all:
        nfp_net_close_free_all(nn);
        return err;
}

int nfp_ctrl_open(struct nfp_net *nn)
{
        int err, r;

        /* ring dumping depends on vNICs being opened/closed under rtnl */
        rtnl_lock();

        err = nfp_net_open_alloc_all(nn);
        if (err)
                goto err_unlock;

        err = nfp_net_set_config_and_enable(nn);
        if (err)
                goto err_free_all;

        for (r = 0; r < nn->dp.num_r_vecs; r++)
                enable_irq(nn->r_vecs[r].irq_vector);

        rtnl_unlock();

        return 0;

err_free_all:
        nfp_net_close_free_all(nn);
err_unlock:
        rtnl_unlock();
        return err;
}

int nfp_net_sched_mbox_amsg_work(struct nfp_net *nn, u32 cmd, const void *data, size_t len,
                                 int (*cb)(struct nfp_net *, struct nfp_mbox_amsg_entry *))
{
        struct nfp_mbox_amsg_entry *entry;

        entry = kmalloc(sizeof(*entry) + len, GFP_ATOMIC);
        if (!entry)
                return -ENOMEM;

        memcpy(entry->msg, data, len);
        entry->cmd = cmd;
        entry->cfg = cb;

        spin_lock_bh(&nn->mbox_amsg.lock);
        list_add_tail(&entry->list, &nn->mbox_amsg.list);
        spin_unlock_bh(&nn->mbox_amsg.lock);

        schedule_work(&nn->mbox_amsg.work);

        return 0;
}

static void nfp_net_mbox_amsg_work(struct work_struct *work)
{
        struct nfp_net *nn = container_of(work, struct nfp_net, mbox_amsg.work);
        struct nfp_mbox_amsg_entry *entry, *tmp;
        struct list_head tmp_list;

        INIT_LIST_HEAD(&tmp_list);

        spin_lock_bh(&nn->mbox_amsg.lock);
        list_splice_init(&nn->mbox_amsg.list, &tmp_list);
        spin_unlock_bh(&nn->mbox_amsg.lock);

        list_for_each_entry_safe(entry, tmp, &tmp_list, list) {
                int err = entry->cfg(nn, entry);

                if (err)
                        nn_err(nn, "Config cmd %d to HW failed %d.\n", entry->cmd, err);

                list_del(&entry->list);
                kfree(entry);
        }
}

static int nfp_net_mc_cfg(struct nfp_net *nn, struct nfp_mbox_amsg_entry *entry)
{
        unsigned char *addr = entry->msg;
        int ret;

        ret = nfp_net_mbox_lock(nn, NFP_NET_CFG_MULTICAST_SZ);
        if (ret)
                return ret;

        nn_writel(nn, nn->tlv_caps.mbox_off + NFP_NET_CFG_MULTICAST_MAC_HI,
                  get_unaligned_be32(addr));
        nn_writew(nn, nn->tlv_caps.mbox_off + NFP_NET_CFG_MULTICAST_MAC_LO,
                  get_unaligned_be16(addr + 4));

        return nfp_net_mbox_reconfig_and_unlock(nn, entry->cmd);
}

static int nfp_net_mc_sync(struct net_device *netdev, const unsigned char *addr)
{
        struct nfp_net *nn = netdev_priv(netdev);

        if (netdev_mc_count(netdev) > NFP_NET_CFG_MAC_MC_MAX) {
                nn_err(nn, "Requested number of MC addresses (%d) exceeds maximum (%d).\n",
                       netdev_mc_count(netdev), NFP_NET_CFG_MAC_MC_MAX);
                return -EINVAL;
        }

        return nfp_net_sched_mbox_amsg_work(nn, NFP_NET_CFG_MBOX_CMD_MULTICAST_ADD, addr,
                                            NFP_NET_CFG_MULTICAST_SZ, nfp_net_mc_cfg);
}

static int nfp_net_mc_unsync(struct net_device *netdev, const unsigned char *addr)
{
        struct nfp_net *nn = netdev_priv(netdev);

        return nfp_net_sched_mbox_amsg_work(nn, NFP_NET_CFG_MBOX_CMD_MULTICAST_DEL, addr,
                                            NFP_NET_CFG_MULTICAST_SZ, nfp_net_mc_cfg);
}

static void nfp_net_set_rx_mode(struct net_device *netdev)
{
        struct nfp_net *nn = netdev_priv(netdev);
        u32 new_ctrl, new_ctrl_w1;

        new_ctrl = nn->dp.ctrl;
        new_ctrl_w1 = nn->dp.ctrl_w1;

        if (!netdev_mc_empty(netdev) || netdev->flags & IFF_ALLMULTI)
                new_ctrl |= nn->cap & NFP_NET_CFG_CTRL_L2MC;
        else
                new_ctrl &= ~NFP_NET_CFG_CTRL_L2MC;

        if (netdev->flags & IFF_ALLMULTI)
                new_ctrl_w1 &= ~NFP_NET_CFG_CTRL_MCAST_FILTER;
        else
                new_ctrl_w1 |= nn->cap_w1 & NFP_NET_CFG_CTRL_MCAST_FILTER;

        if (netdev->flags & IFF_PROMISC) {
                if (nn->cap & NFP_NET_CFG_CTRL_PROMISC)
                        new_ctrl |= NFP_NET_CFG_CTRL_PROMISC;
                else
                        nn_warn(nn, "FW does not support promiscuous mode\n");
        } else {
                new_ctrl &= ~NFP_NET_CFG_CTRL_PROMISC;
        }

        if ((nn->cap_w1 & NFP_NET_CFG_CTRL_MCAST_FILTER) &&
            __dev_mc_sync(netdev, nfp_net_mc_sync, nfp_net_mc_unsync))
                netdev_err(netdev, "Sync mc address failed\n");

        if (new_ctrl == nn->dp.ctrl && new_ctrl_w1 == nn->dp.ctrl_w1)
                return;

        if (new_ctrl != nn->dp.ctrl)
                nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
        if (new_ctrl_w1 != nn->dp.ctrl_w1)
                nn_writel(nn, NFP_NET_CFG_CTRL_WORD1, new_ctrl_w1);
        nfp_net_reconfig_post(nn, NFP_NET_CFG_UPDATE_GEN);

        nn->dp.ctrl = new_ctrl;
        nn->dp.ctrl_w1 = new_ctrl_w1;
}

static void nfp_net_rss_init_itbl(struct nfp_net *nn)
{
        int i;

        for (i = 0; i < sizeof(nn->rss_itbl); i++)
                nn->rss_itbl[i] =
                        ethtool_rxfh_indir_default(i, nn->dp.num_rx_rings);
}

static void nfp_net_dp_swap(struct nfp_net *nn, struct nfp_net_dp *dp)
{
        struct nfp_net_dp new_dp = *dp;

        *dp = nn->dp;
        nn->dp = new_dp;

        WRITE_ONCE(nn->dp.netdev->mtu, new_dp.mtu);

        if (!netif_is_rxfh_configured(nn->dp.netdev))
                nfp_net_rss_init_itbl(nn);
}

static int nfp_net_dp_swap_enable(struct nfp_net *nn, struct nfp_net_dp *dp)
{
        unsigned int r;
        int err;

        nfp_net_dp_swap(nn, dp);

        for (r = 0; r < nn->max_r_vecs; r++)
                nfp_net_vector_assign_rings(&nn->dp, &nn->r_vecs[r], r);

        err = netif_set_real_num_queues(nn->dp.netdev,
                                        nn->dp.num_stack_tx_rings,
                                        nn->dp.num_rx_rings);
        if (err)
                return err;

        return nfp_net_set_config_and_enable(nn);
}

struct nfp_net_dp *nfp_net_clone_dp(struct nfp_net *nn)
{
        struct nfp_net_dp *new;

        new = kmalloc_obj(*new);
        if (!new)
                return NULL;

        *new = nn->dp;

        new->xsk_pools = kmemdup(new->xsk_pools,
                                 array_size(nn->max_r_vecs,
                                            sizeof(new->xsk_pools)),
                                 GFP_KERNEL);
        if (!new->xsk_pools) {
                kfree(new);
                return NULL;
        }

        /* Clear things which need to be recomputed */
        new->fl_bufsz = 0;
        new->tx_rings = NULL;
        new->rx_rings = NULL;
        new->num_r_vecs = 0;
        new->num_stack_tx_rings = 0;
        new->txrwb = NULL;
        new->txrwb_dma = 0;

        return new;
}

static void nfp_net_free_dp(struct nfp_net_dp *dp)
{
        kfree(dp->xsk_pools);
        kfree(dp);
}

static int
nfp_net_check_config(struct nfp_net *nn, struct nfp_net_dp *dp,
                     struct netlink_ext_ack *extack)
{
        unsigned int r, xsk_min_fl_bufsz;

        /* XDP-enabled tests */
        if (!dp->xdp_prog)
                return 0;
        if (dp->fl_bufsz > PAGE_SIZE) {
                NL_SET_ERR_MSG_MOD(extack, "MTU too large w/ XDP enabled");
                return -EINVAL;
        }
        if (dp->num_tx_rings > nn->max_tx_rings) {
                NL_SET_ERR_MSG_MOD(extack, "Insufficient number of TX rings w/ XDP enabled");
                return -EINVAL;
        }

        xsk_min_fl_bufsz = nfp_net_calc_fl_bufsz_xsk(dp);
        for (r = 0; r < nn->max_r_vecs; r++) {
                if (!dp->xsk_pools[r])
                        continue;

                if (xsk_pool_get_rx_frame_size(dp->xsk_pools[r]) < xsk_min_fl_bufsz) {
                        NL_SET_ERR_MSG_MOD(extack,
                                           "XSK buffer pool chunk size too small");
                        return -EINVAL;
                }
        }

        return 0;
}

int nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_dp *dp,
                          struct netlink_ext_ack *extack)
{
        int r, err;

        dp->fl_bufsz = nfp_net_calc_fl_bufsz(dp);

        dp->num_stack_tx_rings = dp->num_tx_rings;
        if (dp->xdp_prog)
                dp->num_stack_tx_rings -= dp->num_rx_rings;

        dp->num_r_vecs = max(dp->num_rx_rings, dp->num_stack_tx_rings);

        err = nfp_net_check_config(nn, dp, extack);
        if (err)
                goto exit_free_dp;

        if (!netif_running(dp->netdev)) {
                nfp_net_dp_swap(nn, dp);
                err = 0;
                goto exit_free_dp;
        }

        /* Prepare new rings */
        for (r = nn->dp.num_r_vecs; r < dp->num_r_vecs; r++) {
                err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r);
                if (err) {
                        dp->num_r_vecs = r;
                        goto err_cleanup_vecs;
                }
        }

        err = nfp_net_rx_rings_prepare(nn, dp);
        if (err)
                goto err_cleanup_vecs;

        err = nfp_net_tx_rings_prepare(nn, dp);
        if (err)
                goto err_free_rx;

        /* Stop device, swap in new rings, try to start the firmware */
        nfp_net_close_stack(nn);
        nfp_net_clear_config_and_disable(nn);

        err = nfp_net_dp_swap_enable(nn, dp);
        if (err) {
                int err2;

                nfp_net_clear_config_and_disable(nn);

                /* Try with old configuration and old rings */
                err2 = nfp_net_dp_swap_enable(nn, dp);
                if (err2)
                        nn_err(nn, "Can't restore ring config - FW communication failed (%d,%d)\n",
                               err, err2);
        }
        for (r = dp->num_r_vecs - 1; r >= nn->dp.num_r_vecs; r--)
                nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);

        nfp_net_rx_rings_free(dp);
        nfp_net_tx_rings_free(dp);

        nfp_net_open_stack(nn);
exit_free_dp:
        nfp_net_free_dp(dp);

        return err;

err_free_rx:
        nfp_net_rx_rings_free(dp);
err_cleanup_vecs:
        for (r = dp->num_r_vecs - 1; r >= nn->dp.num_r_vecs; r--)
                nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
        nfp_net_free_dp(dp);
        return err;
}

static int nfp_net_change_mtu(struct net_device *netdev, int new_mtu)
{
        struct nfp_net *nn = netdev_priv(netdev);
        struct nfp_net_dp *dp;
        int err;

        err = nfp_app_check_mtu(nn->app, netdev, new_mtu);
        if (err)
                return err;

        dp = nfp_net_clone_dp(nn);
        if (!dp)
                return -ENOMEM;

        dp->mtu = new_mtu;

        return nfp_net_ring_reconfig(nn, dp, NULL);
}

static int
nfp_net_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
{
        const u32 cmd = NFP_NET_CFG_MBOX_CMD_CTAG_FILTER_ADD;
        struct nfp_net *nn = netdev_priv(netdev);
        int err;

        /* Priority tagged packets with vlan id 0 are processed by the
         * NFP as untagged packets
         */
        if (!vid)
                return 0;

        err = nfp_net_mbox_lock(nn, NFP_NET_CFG_VLAN_FILTER_SZ);
        if (err)
                return err;

        nn_writew(nn, nn->tlv_caps.mbox_off + NFP_NET_CFG_VLAN_FILTER_VID, vid);
        nn_writew(nn, nn->tlv_caps.mbox_off + NFP_NET_CFG_VLAN_FILTER_PROTO,
                  ETH_P_8021Q);

        return nfp_net_mbox_reconfig_and_unlock(nn, cmd);
}

static int
nfp_net_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
{
        const u32 cmd = NFP_NET_CFG_MBOX_CMD_CTAG_FILTER_KILL;
        struct nfp_net *nn = netdev_priv(netdev);
        int err;

        /* Priority tagged packets with vlan id 0 are processed by the
         * NFP as untagged packets
         */
        if (!vid)
                return 0;

        err = nfp_net_mbox_lock(nn, NFP_NET_CFG_VLAN_FILTER_SZ);
        if (err)
                return err;

        nn_writew(nn, nn->tlv_caps.mbox_off + NFP_NET_CFG_VLAN_FILTER_VID, vid);
        nn_writew(nn, nn->tlv_caps.mbox_off + NFP_NET_CFG_VLAN_FILTER_PROTO,
                  ETH_P_8021Q);

        return nfp_net_mbox_reconfig_and_unlock(nn, cmd);
}

static void
nfp_net_fs_fill_v4(struct nfp_net *nn, struct nfp_fs_entry *entry, u32 op, u32 *addr)
{
        unsigned int i;

        union {
                struct {
                        __be16 loc;
                        u8 k_proto, m_proto;
                        __be32 k_sip, m_sip, k_dip, m_dip;
                        __be16 k_sport, m_sport, k_dport, m_dport;
                };
                __be32 val[7];
        } v4_rule;

        nn_writel(nn, *addr, op);
        *addr += sizeof(u32);

        v4_rule.loc     = cpu_to_be16(entry->loc);
        v4_rule.k_proto = entry->key.l4_proto;
        v4_rule.m_proto = entry->msk.l4_proto;
        v4_rule.k_sip   = entry->key.sip4;
        v4_rule.m_sip   = entry->msk.sip4;
        v4_rule.k_dip   = entry->key.dip4;
        v4_rule.m_dip   = entry->msk.dip4;
        v4_rule.k_sport = entry->key.sport;
        v4_rule.m_sport = entry->msk.sport;
        v4_rule.k_dport = entry->key.dport;
        v4_rule.m_dport = entry->msk.dport;

        for (i = 0; i < ARRAY_SIZE(v4_rule.val); i++, *addr += sizeof(__be32))
                nn_writel(nn, *addr, be32_to_cpu(v4_rule.val[i]));
}

static void
nfp_net_fs_fill_v6(struct nfp_net *nn, struct nfp_fs_entry *entry, u32 op, u32 *addr)
{
        unsigned int i;

        union {
                struct {
                        __be16 loc;
                        u8 k_proto, m_proto;
                        __be32 k_sip[4], m_sip[4], k_dip[4], m_dip[4];
                        __be16 k_sport, m_sport, k_dport, m_dport;
                };
                __be32 val[19];
        } v6_rule;

        nn_writel(nn, *addr, op);
        *addr += sizeof(u32);

        v6_rule.loc     = cpu_to_be16(entry->loc);
        v6_rule.k_proto = entry->key.l4_proto;
        v6_rule.m_proto = entry->msk.l4_proto;
        for (i = 0; i < 4; i++) {
                v6_rule.k_sip[i] = entry->key.sip6[i];
                v6_rule.m_sip[i] = entry->msk.sip6[i];
                v6_rule.k_dip[i] = entry->key.dip6[i];
                v6_rule.m_dip[i] = entry->msk.dip6[i];
        }
        v6_rule.k_sport = entry->key.sport;
        v6_rule.m_sport = entry->msk.sport;
        v6_rule.k_dport = entry->key.dport;
        v6_rule.m_dport = entry->msk.dport;

        for (i = 0; i < ARRAY_SIZE(v6_rule.val); i++, *addr += sizeof(__be32))
                nn_writel(nn, *addr, be32_to_cpu(v6_rule.val[i]));
}

#define NFP_FS_QUEUE_ID GENMASK(22, 16)
#define NFP_FS_ACT      GENMASK(15, 0)
#define NFP_FS_ACT_DROP BIT(0)
#define NFP_FS_ACT_Q    BIT(1)
static void
nfp_net_fs_fill_act(struct nfp_net *nn, struct nfp_fs_entry *entry, u32 addr)
{
        u32 action = 0; /* 0 means default passthrough */

        if (entry->action == RX_CLS_FLOW_DISC)
                action = NFP_FS_ACT_DROP;
        else if (!(entry->flow_type & FLOW_RSS))
                action = FIELD_PREP(NFP_FS_QUEUE_ID, entry->action) | NFP_FS_ACT_Q;

        nn_writel(nn, addr, action);
}

int nfp_net_fs_add_hw(struct nfp_net *nn, struct nfp_fs_entry *entry)
{
        u32 addr = nn->tlv_caps.mbox_off + NFP_NET_CFG_MBOX_SIMPLE_VAL;
        int err;

        err = nfp_net_mbox_lock(nn, NFP_NET_CFG_FS_SZ);
        if (err)
                return err;

        switch (entry->flow_type & ~FLOW_RSS) {
        case TCP_V4_FLOW:
        case UDP_V4_FLOW:
        case SCTP_V4_FLOW:
        case IPV4_USER_FLOW:
                nfp_net_fs_fill_v4(nn, entry, NFP_NET_CFG_MBOX_CMD_FS_ADD_V4, &addr);
                break;
        case TCP_V6_FLOW:
        case UDP_V6_FLOW:
        case SCTP_V6_FLOW:
        case IPV6_USER_FLOW:
                nfp_net_fs_fill_v6(nn, entry, NFP_NET_CFG_MBOX_CMD_FS_ADD_V6, &addr);
                break;
        case ETHER_FLOW:
                nn_writel(nn, addr, NFP_NET_CFG_MBOX_CMD_FS_ADD_ETHTYPE);
                addr += sizeof(u32);
                nn_writew(nn, addr, be16_to_cpu(entry->key.l3_proto));
                addr += sizeof(u32);
                break;
        }

        nfp_net_fs_fill_act(nn, entry, addr);

        err = nfp_net_mbox_reconfig_and_unlock(nn, NFP_NET_CFG_MBOX_CMD_FLOW_STEER);
        if (err) {
                nn_err(nn, "Add new fs rule failed with %d\n", err);
                return -EIO;
        }

        return 0;
}

int nfp_net_fs_del_hw(struct nfp_net *nn, struct nfp_fs_entry *entry)
{
        u32 addr = nn->tlv_caps.mbox_off + NFP_NET_CFG_MBOX_SIMPLE_VAL;
        int err;

        err = nfp_net_mbox_lock(nn, NFP_NET_CFG_FS_SZ);
        if (err)
                return err;

        switch (entry->flow_type & ~FLOW_RSS) {
        case TCP_V4_FLOW:
        case UDP_V4_FLOW:
        case SCTP_V4_FLOW:
        case IPV4_USER_FLOW:
                nfp_net_fs_fill_v4(nn, entry, NFP_NET_CFG_MBOX_CMD_FS_DEL_V4, &addr);
                break;
        case TCP_V6_FLOW:
        case UDP_V6_FLOW:
        case SCTP_V6_FLOW:
        case IPV6_USER_FLOW:
                nfp_net_fs_fill_v6(nn, entry, NFP_NET_CFG_MBOX_CMD_FS_DEL_V6, &addr);
                break;
        case ETHER_FLOW:
                nn_writel(nn, addr, NFP_NET_CFG_MBOX_CMD_FS_DEL_ETHTYPE);
                addr += sizeof(u32);
                nn_writew(nn, addr, be16_to_cpu(entry->key.l3_proto));
                addr += sizeof(u32);
                break;
        }

        nfp_net_fs_fill_act(nn, entry, addr);

        err = nfp_net_mbox_reconfig_and_unlock(nn, NFP_NET_CFG_MBOX_CMD_FLOW_STEER);
        if (err) {
                nn_err(nn, "Delete fs rule failed with %d\n", err);
                return -EIO;
        }

        return 0;
}

static void nfp_net_fs_clean(struct nfp_net *nn)
{
        struct nfp_fs_entry *entry, *tmp;

        list_for_each_entry_safe(entry, tmp, &nn->fs.list, node) {
                nfp_net_fs_del_hw(nn, entry);
                list_del(&entry->node);
                kfree(entry);
        }
}

static void nfp_net_stat64(struct net_device *netdev,
                           struct rtnl_link_stats64 *stats)
{
        struct nfp_net *nn = netdev_priv(netdev);
        int r;

        /* Collect software stats */
        for (r = 0; r < nn->max_r_vecs; r++) {
                struct nfp_net_r_vector *r_vec = &nn->r_vecs[r];
                u64 data[3];
                unsigned int start;

                do {
                        start = u64_stats_fetch_begin(&r_vec->rx_sync);
                        data[0] = r_vec->rx_pkts;
                        data[1] = r_vec->rx_bytes;
                        data[2] = r_vec->rx_drops;
                } while (u64_stats_fetch_retry(&r_vec->rx_sync, start));
                stats->rx_packets += data[0];
                stats->rx_bytes += data[1];
                stats->rx_dropped += data[2];

                do {
                        start = u64_stats_fetch_begin(&r_vec->tx_sync);
                        data[0] = r_vec->tx_pkts;
                        data[1] = r_vec->tx_bytes;
                        data[2] = r_vec->tx_errors;
                } while (u64_stats_fetch_retry(&r_vec->tx_sync, start));
                stats->tx_packets += data[0];
                stats->tx_bytes += data[1];
                stats->tx_errors += data[2];
        }

        /* Add in device stats */
        stats->multicast += nn_readq(nn, NFP_NET_CFG_STATS_RX_MC_FRAMES);
        stats->rx_dropped += nn_readq(nn, NFP_NET_CFG_STATS_RX_DISCARDS);
        stats->rx_errors += nn_readq(nn, NFP_NET_CFG_STATS_RX_ERRORS);

        stats->tx_dropped += nn_readq(nn, NFP_NET_CFG_STATS_TX_DISCARDS);
        stats->tx_errors += nn_readq(nn, NFP_NET_CFG_STATS_TX_ERRORS);
}

static int nfp_net_set_features(struct net_device *netdev,
                                netdev_features_t features)
{
        netdev_features_t changed = netdev->features ^ features;
        struct nfp_net *nn = netdev_priv(netdev);
        u32 new_ctrl;
        int err;

        /* Assume this is not called with features we have not advertised */

        new_ctrl = nn->dp.ctrl;

        if (changed & NETIF_F_RXCSUM) {
                if (features & NETIF_F_RXCSUM)
                        new_ctrl |= nn->cap & NFP_NET_CFG_CTRL_RXCSUM_ANY;
                else
                        new_ctrl &= ~NFP_NET_CFG_CTRL_RXCSUM_ANY;
        }

        if (changed & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) {
                if (features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))
                        new_ctrl |= NFP_NET_CFG_CTRL_TXCSUM;
                else
                        new_ctrl &= ~NFP_NET_CFG_CTRL_TXCSUM;
        }

        if (changed & (NETIF_F_TSO | NETIF_F_TSO6)) {
                if (features & (NETIF_F_TSO | NETIF_F_TSO6))
                        new_ctrl |= nn->cap & NFP_NET_CFG_CTRL_LSO2 ?:
                                              NFP_NET_CFG_CTRL_LSO;
                else
                        new_ctrl &= ~NFP_NET_CFG_CTRL_LSO_ANY;
        }

        if (changed & NETIF_F_HW_VLAN_CTAG_RX) {
                if (features & NETIF_F_HW_VLAN_CTAG_RX)
                        new_ctrl |= nn->cap & NFP_NET_CFG_CTRL_RXVLAN_V2 ?:
                                    NFP_NET_CFG_CTRL_RXVLAN;
                else
                        new_ctrl &= ~NFP_NET_CFG_CTRL_RXVLAN_ANY;
        }

        if (changed & NETIF_F_HW_VLAN_CTAG_TX) {
                if (features & NETIF_F_HW_VLAN_CTAG_TX)
                        new_ctrl |= nn->cap & NFP_NET_CFG_CTRL_TXVLAN_V2 ?:
                                    NFP_NET_CFG_CTRL_TXVLAN;
                else
                        new_ctrl &= ~NFP_NET_CFG_CTRL_TXVLAN_ANY;
        }

        if (changed & NETIF_F_HW_VLAN_CTAG_FILTER) {
                if (features & NETIF_F_HW_VLAN_CTAG_FILTER)
                        new_ctrl |= NFP_NET_CFG_CTRL_CTAG_FILTER;
                else
                        new_ctrl &= ~NFP_NET_CFG_CTRL_CTAG_FILTER;
        }

        if (changed & NETIF_F_HW_VLAN_STAG_RX) {
                if (features & NETIF_F_HW_VLAN_STAG_RX)
                        new_ctrl |= NFP_NET_CFG_CTRL_RXQINQ;
                else
                        new_ctrl &= ~NFP_NET_CFG_CTRL_RXQINQ;
        }

        if (changed & NETIF_F_SG) {
                if (features & NETIF_F_SG)
                        new_ctrl |= NFP_NET_CFG_CTRL_GATHER;
                else
                        new_ctrl &= ~NFP_NET_CFG_CTRL_GATHER;
        }

        err = nfp_port_set_features(netdev, features);
        if (err)
                return err;

        nn_dbg(nn, "Feature change 0x%llx -> 0x%llx (changed=0x%llx)\n",
               netdev->features, features, changed);

        if (new_ctrl == nn->dp.ctrl)
                return 0;

        nn_dbg(nn, "NIC ctrl: 0x%x -> 0x%x\n", nn->dp.ctrl, new_ctrl);
        nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
        err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_GEN);
        if (err)
                return err;

        nn->dp.ctrl = new_ctrl;

        return 0;
}

static netdev_features_t
nfp_net_fix_features(struct net_device *netdev,
                     netdev_features_t features)
{
        if ((features & NETIF_F_HW_VLAN_CTAG_RX) &&
            (features & NETIF_F_HW_VLAN_STAG_RX)) {
                if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX) {
                        features &= ~NETIF_F_HW_VLAN_CTAG_RX;
                        netdev->wanted_features &= ~NETIF_F_HW_VLAN_CTAG_RX;
                        netdev_warn(netdev,
                                    "S-tag and C-tag stripping can't be enabled at the same time. Enabling S-tag stripping and disabling C-tag stripping\n");
                } else if (netdev->features & NETIF_F_HW_VLAN_STAG_RX) {
                        features &= ~NETIF_F_HW_VLAN_STAG_RX;
                        netdev->wanted_features &= ~NETIF_F_HW_VLAN_STAG_RX;
                        netdev_warn(netdev,
                                    "S-tag and C-tag stripping can't be enabled at the same time. Enabling C-tag stripping and disabling S-tag stripping\n");
                }
        }
        return features;
}

static netdev_features_t
nfp_net_features_check(struct sk_buff *skb, struct net_device *dev,
                       netdev_features_t features)
{
        u8 l4_hdr;

        /* We can't do TSO over double tagged packets (802.1AD) */
        features &= vlan_features_check(skb, features);

        if (!skb->encapsulation)
                return features;

        /* Ensure that inner L4 header offset fits into TX descriptor field */
        if (skb_is_gso(skb)) {
                u32 hdrlen;

                if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
                        hdrlen = skb_inner_transport_offset(skb) + sizeof(struct udphdr);
                else
                        hdrlen = skb_inner_tcp_all_headers(skb);

                /* Assume worst case scenario of having longest possible
                 * metadata prepend - 8B
                 */
                if (unlikely(hdrlen > NFP_NET_LSO_MAX_HDR_SZ - 8))
                        features &= ~NETIF_F_GSO_MASK;
        }

        if (xfrm_offload(skb))
                return features;

        /* VXLAN/GRE check */
        switch (vlan_get_protocol(skb)) {
        case htons(ETH_P_IP):
                l4_hdr = ip_hdr(skb)->protocol;
                break;
        case htons(ETH_P_IPV6):
                l4_hdr = ipv6_hdr(skb)->nexthdr;
                break;
        default:
                return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
        }

        if (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
            skb->inner_protocol != htons(ETH_P_TEB) ||
            (l4_hdr != IPPROTO_UDP && l4_hdr != IPPROTO_GRE) ||
            (l4_hdr == IPPROTO_UDP &&
             (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
              sizeof(struct udphdr) + sizeof(struct vxlanhdr))))
                return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);

        return features;
}

static int
nfp_net_get_phys_port_name(struct net_device *netdev, char *name, size_t len)
{
        struct nfp_net *nn = netdev_priv(netdev);
        int n;

        /* If port is defined, devlink_port is registered and devlink core
         * is taking care of name formatting.
         */
        if (nn->port)
                return -EOPNOTSUPP;

        if (nn->dp.is_vf || nn->vnic_no_name)
                return -EOPNOTSUPP;

        n = snprintf(name, len, "n%d", nn->id);
        if (n >= len)
                return -EINVAL;

        return 0;
}

static int nfp_net_xdp_setup_drv(struct nfp_net *nn, struct netdev_bpf *bpf)
{
        struct bpf_prog *prog = bpf->prog;
        struct nfp_net_dp *dp;
        int err;

        if (!prog == !nn->dp.xdp_prog) {
                WRITE_ONCE(nn->dp.xdp_prog, prog);
                xdp_attachment_setup(&nn->xdp, bpf);
                return 0;
        }

        dp = nfp_net_clone_dp(nn);
        if (!dp)
                return -ENOMEM;

        dp->xdp_prog = prog;
        dp->num_tx_rings += prog ? nn->dp.num_rx_rings : -nn->dp.num_rx_rings;
        dp->rx_dma_dir = prog ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE;
        dp->rx_dma_off = prog ? XDP_PACKET_HEADROOM - nn->dp.rx_offset : 0;

        /* We need RX reconfig to remap the buffers (BIDIR vs FROM_DEV) */
        err = nfp_net_ring_reconfig(nn, dp, bpf->extack);
        if (err)
                return err;

        xdp_attachment_setup(&nn->xdp, bpf);
        return 0;
}

static int nfp_net_xdp_setup_hw(struct nfp_net *nn, struct netdev_bpf *bpf)
{
        int err;

        err = nfp_app_xdp_offload(nn->app, nn, bpf->prog, bpf->extack);
        if (err)
                return err;

        xdp_attachment_setup(&nn->xdp_hw, bpf);
        return 0;
}

static int nfp_net_xdp(struct net_device *netdev, struct netdev_bpf *xdp)
{
        struct nfp_net *nn = netdev_priv(netdev);

        switch (xdp->command) {
        case XDP_SETUP_PROG:
                return nfp_net_xdp_setup_drv(nn, xdp);
        case XDP_SETUP_PROG_HW:
                return nfp_net_xdp_setup_hw(nn, xdp);
        case XDP_SETUP_XSK_POOL:
                return nfp_net_xsk_setup_pool(netdev, xdp->xsk.pool,
                                              xdp->xsk.queue_id);
        default:
                return nfp_app_bpf(nn->app, nn, xdp);
        }
}

static int nfp_net_set_mac_address(struct net_device *netdev, void *addr)
{
        struct nfp_net *nn = netdev_priv(netdev);
        struct sockaddr *saddr = addr;
        int err;

        err = eth_prepare_mac_addr_change(netdev, addr);
        if (err)
                return err;

        nfp_net_write_mac_addr(nn, saddr->sa_data);

        err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_MACADDR);
        if (err)
                return err;

        eth_commit_mac_addr_change(netdev, addr);

        return 0;
}

static int nfp_net_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
                                  struct net_device *dev, u32 filter_mask,
                                  int nlflags)
{
        struct nfp_net *nn = netdev_priv(dev);
        u16 mode;

        if (!(nn->cap & NFP_NET_CFG_CTRL_VEPA))
                return -EOPNOTSUPP;

        mode = (nn->dp.ctrl & NFP_NET_CFG_CTRL_VEPA) ?
               BRIDGE_MODE_VEPA : BRIDGE_MODE_VEB;

        return ndo_dflt_bridge_getlink(skb, pid, seq, dev, mode, 0, 0,
                                       nlflags, filter_mask, NULL);
}

static int nfp_net_bridge_setlink(struct net_device *dev, struct nlmsghdr *nlh,
                                  u16 flags, struct netlink_ext_ack *extack)
{
        struct nfp_net *nn = netdev_priv(dev);
        struct nlattr *attr, *br_spec;
        int rem, err;
        u32 new_ctrl;
        u16 mode;

        if (!(nn->cap & NFP_NET_CFG_CTRL_VEPA))
                return -EOPNOTSUPP;

        br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
        if (!br_spec)
                return -EINVAL;

        nla_for_each_nested_type(attr, IFLA_BRIDGE_MODE, br_spec, rem) {
                new_ctrl = nn->dp.ctrl;
                mode = nla_get_u16(attr);
                if (mode == BRIDGE_MODE_VEPA)
                        new_ctrl |= NFP_NET_CFG_CTRL_VEPA;
                else if (mode == BRIDGE_MODE_VEB)
                        new_ctrl &= ~NFP_NET_CFG_CTRL_VEPA;
                else
                        return -EOPNOTSUPP;

                if (new_ctrl == nn->dp.ctrl)
                        return 0;

                nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
                err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_GEN);
                if (!err)
                        nn->dp.ctrl = new_ctrl;

                return err;
        }

        return -EINVAL;
}

const struct net_device_ops nfp_nfd3_netdev_ops = {
        .ndo_init               = nfp_app_ndo_init,
        .ndo_uninit             = nfp_app_ndo_uninit,
        .ndo_open               = nfp_net_netdev_open,
        .ndo_stop               = nfp_net_netdev_close,
        .ndo_start_xmit         = nfp_net_tx,
        .ndo_get_stats64        = nfp_net_stat64,
        .ndo_vlan_rx_add_vid    = nfp_net_vlan_rx_add_vid,
        .ndo_vlan_rx_kill_vid   = nfp_net_vlan_rx_kill_vid,
        .ndo_set_vf_mac         = nfp_app_set_vf_mac,
        .ndo_set_vf_vlan        = nfp_app_set_vf_vlan,
        .ndo_set_vf_rate        = nfp_app_set_vf_rate,
        .ndo_set_vf_spoofchk    = nfp_app_set_vf_spoofchk,
        .ndo_set_vf_trust       = nfp_app_set_vf_trust,
        .ndo_get_vf_config      = nfp_app_get_vf_config,
        .ndo_set_vf_link_state  = nfp_app_set_vf_link_state,
        .ndo_setup_tc           = nfp_port_setup_tc,
        .ndo_tx_timeout         = nfp_net_tx_timeout,
        .ndo_set_rx_mode        = nfp_net_set_rx_mode,
        .ndo_change_mtu         = nfp_net_change_mtu,
        .ndo_set_mac_address    = nfp_net_set_mac_address,
        .ndo_set_features       = nfp_net_set_features,
        .ndo_fix_features       = nfp_net_fix_features,
        .ndo_features_check     = nfp_net_features_check,
        .ndo_get_phys_port_name = nfp_net_get_phys_port_name,
        .ndo_bpf                = nfp_net_xdp,
        .ndo_xsk_wakeup         = nfp_net_xsk_wakeup,
        .ndo_bridge_getlink     = nfp_net_bridge_getlink,
        .ndo_bridge_setlink     = nfp_net_bridge_setlink,
};

const struct net_device_ops nfp_nfdk_netdev_ops = {
        .ndo_init               = nfp_app_ndo_init,
        .ndo_uninit             = nfp_app_ndo_uninit,
        .ndo_open               = nfp_net_netdev_open,
        .ndo_stop               = nfp_net_netdev_close,
        .ndo_start_xmit         = nfp_net_tx,
        .ndo_get_stats64        = nfp_net_stat64,
        .ndo_vlan_rx_add_vid    = nfp_net_vlan_rx_add_vid,
        .ndo_vlan_rx_kill_vid   = nfp_net_vlan_rx_kill_vid,
        .ndo_set_vf_mac         = nfp_app_set_vf_mac,
        .ndo_set_vf_vlan        = nfp_app_set_vf_vlan,
        .ndo_set_vf_rate        = nfp_app_set_vf_rate,
        .ndo_set_vf_spoofchk    = nfp_app_set_vf_spoofchk,
        .ndo_set_vf_trust       = nfp_app_set_vf_trust,
        .ndo_get_vf_config      = nfp_app_get_vf_config,
        .ndo_set_vf_link_state  = nfp_app_set_vf_link_state,
        .ndo_setup_tc           = nfp_port_setup_tc,
        .ndo_tx_timeout         = nfp_net_tx_timeout,
        .ndo_set_rx_mode        = nfp_net_set_rx_mode,
        .ndo_change_mtu         = nfp_net_change_mtu,
        .ndo_set_mac_address    = nfp_net_set_mac_address,
        .ndo_set_features       = nfp_net_set_features,
        .ndo_fix_features       = nfp_net_fix_features,
        .ndo_features_check     = nfp_net_features_check,
        .ndo_get_phys_port_name = nfp_net_get_phys_port_name,
        .ndo_bpf                = nfp_net_xdp,
        .ndo_bridge_getlink     = nfp_net_bridge_getlink,
        .ndo_bridge_setlink     = nfp_net_bridge_setlink,
};

static int nfp_udp_tunnel_sync(struct net_device *netdev, unsigned int table)
{
        struct nfp_net *nn = netdev_priv(netdev);
        int i;

        BUILD_BUG_ON(NFP_NET_N_VXLAN_PORTS & 1);
        for (i = 0; i < NFP_NET_N_VXLAN_PORTS; i += 2) {
                struct udp_tunnel_info ti0, ti1;

                udp_tunnel_nic_get_port(netdev, table, i, &ti0);
                udp_tunnel_nic_get_port(netdev, table, i + 1, &ti1);

                nn_writel(nn, NFP_NET_CFG_VXLAN_PORT + i * sizeof(ti0.port),
                          be16_to_cpu(ti1.port) << 16 | be16_to_cpu(ti0.port));
        }

        return nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_VXLAN);
}

static const struct udp_tunnel_nic_info nfp_udp_tunnels = {
        .sync_table     = nfp_udp_tunnel_sync,
        .flags          = UDP_TUNNEL_NIC_INFO_OPEN_ONLY,
        .tables         = {
                {
                        .n_entries      = NFP_NET_N_VXLAN_PORTS,
                        .tunnel_types   = UDP_TUNNEL_TYPE_VXLAN,
                },
        },
};

/**
 * nfp_net_info() - Print general info about the NIC
 * @nn:      NFP Net device to reconfigure
 */
void nfp_net_info(struct nfp_net *nn)
{
        nn_info(nn, "NFP-6xxx %sNetdev: TxQs=%d/%d RxQs=%d/%d\n",
                nn->dp.is_vf ? "VF " : "",
                nn->dp.num_tx_rings, nn->max_tx_rings,
                nn->dp.num_rx_rings, nn->max_rx_rings);
        nn_info(nn, "VER: %d.%d.%d.%d, Maximum supported MTU: %d\n",
                nn->fw_ver.extend, nn->fw_ver.class,
                nn->fw_ver.major, nn->fw_ver.minor,
                nn->max_mtu);
        nn_info(nn, "CAP: %#x %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
                nn->cap,
                nn->cap & NFP_NET_CFG_CTRL_PROMISC  ? "PROMISC "  : "",
                nn->cap & NFP_NET_CFG_CTRL_L2BC     ? "L2BCFILT " : "",
                nn->cap & NFP_NET_CFG_CTRL_L2MC     ? "L2MCFILT " : "",
                nn->cap & NFP_NET_CFG_CTRL_RXCSUM   ? "RXCSUM "   : "",
                nn->cap & NFP_NET_CFG_CTRL_TXCSUM   ? "TXCSUM "   : "",
                nn->cap & NFP_NET_CFG_CTRL_RXVLAN   ? "RXVLAN "   : "",
                nn->cap & NFP_NET_CFG_CTRL_TXVLAN   ? "TXVLAN "   : "",
                nn->cap & NFP_NET_CFG_CTRL_RXQINQ   ? "RXQINQ "   : "",
                nn->cap & NFP_NET_CFG_CTRL_RXVLAN_V2 ? "RXVLANv2 "   : "",
                nn->cap & NFP_NET_CFG_CTRL_TXVLAN_V2   ? "TXVLANv2 "   : "",
                nn->cap & NFP_NET_CFG_CTRL_SCATTER  ? "SCATTER "  : "",
                nn->cap & NFP_NET_CFG_CTRL_GATHER   ? "GATHER "   : "",
                nn->cap & NFP_NET_CFG_CTRL_LSO      ? "TSO1 "     : "",
                nn->cap & NFP_NET_CFG_CTRL_LSO2     ? "TSO2 "     : "",
                nn->cap & NFP_NET_CFG_CTRL_RSS      ? "RSS1 "     : "",
                nn->cap & NFP_NET_CFG_CTRL_RSS2     ? "RSS2 "     : "",
                nn->cap & NFP_NET_CFG_CTRL_CTAG_FILTER ? "CTAG_FILTER " : "",
                nn->cap & NFP_NET_CFG_CTRL_MSIXAUTO ? "AUTOMASK " : "",
                nn->cap & NFP_NET_CFG_CTRL_IRQMOD   ? "IRQMOD "   : "",
                nn->cap & NFP_NET_CFG_CTRL_TXRWB    ? "TXRWB "    : "",
                nn->cap & NFP_NET_CFG_CTRL_VEPA     ? "VEPA "     : "",
                nn->cap & NFP_NET_CFG_CTRL_VXLAN    ? "VXLAN "    : "",
                nn->cap & NFP_NET_CFG_CTRL_NVGRE    ? "NVGRE "    : "",
                nn->cap & NFP_NET_CFG_CTRL_CSUM_COMPLETE ?
                                                      "RXCSUM_COMPLETE " : "",
                nn->cap & NFP_NET_CFG_CTRL_LIVE_ADDR ? "LIVE_ADDR " : "",
                nn->cap_w1 & NFP_NET_CFG_CTRL_MCAST_FILTER ? "MULTICAST_FILTER " : "",
                nn->cap_w1 & NFP_NET_CFG_CTRL_USO ? "USO " : "",
                nfp_app_extra_cap(nn->app, nn));
}

/**
 * nfp_net_alloc() - Allocate netdev and related structure
 * @pdev:         PCI device
 * @dev_info:     NFP ASIC params
 * @ctrl_bar:     PCI IOMEM with vNIC config memory
 * @needs_netdev: Whether to allocate a netdev for this vNIC
 * @max_tx_rings: Maximum number of TX rings supported by device
 * @max_rx_rings: Maximum number of RX rings supported by device
 *
 * This function allocates a netdev device and fills in the initial
 * part of the @struct nfp_net structure.  In case of control device
 * nfp_net structure is allocated without the netdev.
 *
 * Return: NFP Net device structure, or ERR_PTR on error.
 */
struct nfp_net *
nfp_net_alloc(struct pci_dev *pdev, const struct nfp_dev_info *dev_info,
              void __iomem *ctrl_bar, bool needs_netdev,
              unsigned int max_tx_rings, unsigned int max_rx_rings)
{
        u64 dma_mask = dma_get_mask(&pdev->dev);
        struct nfp_net *nn;
        int err;

        if (needs_netdev) {
                struct net_device *netdev;

                netdev = alloc_etherdev_mqs(sizeof(struct nfp_net),
                                            max_tx_rings, max_rx_rings);
                if (!netdev)
                        return ERR_PTR(-ENOMEM);

                SET_NETDEV_DEV(netdev, &pdev->dev);
                nn = netdev_priv(netdev);
                nn->dp.netdev = netdev;
        } else {
                nn = vzalloc(sizeof(*nn));
                if (!nn)
                        return ERR_PTR(-ENOMEM);
        }

        nn->dp.dev = &pdev->dev;
        nn->dp.ctrl_bar = ctrl_bar;
        nn->dev_info = dev_info;
        nn->pdev = pdev;
        nfp_net_get_fw_version(&nn->fw_ver, ctrl_bar);

        switch (FIELD_GET(NFP_NET_CFG_VERSION_DP_MASK, nn->fw_ver.extend)) {
        case NFP_NET_CFG_VERSION_DP_NFD3:
                nn->dp.ops = &nfp_nfd3_ops;
                break;
        case NFP_NET_CFG_VERSION_DP_NFDK:
                if (nn->fw_ver.major < 5) {
                        dev_err(&pdev->dev,
                                "NFDK must use ABI 5 or newer, found: %d\n",
                                nn->fw_ver.major);
                        err = -EINVAL;
                        goto err_free_nn;
                }
                nn->dp.ops = &nfp_nfdk_ops;
                break;
        default:
                err = -EINVAL;
                goto err_free_nn;
        }

        if ((dma_mask & nn->dp.ops->dma_mask) != dma_mask) {
                dev_err(&pdev->dev,
                        "DMA mask of loaded firmware: %llx, required DMA mask: %llx\n",
                        nn->dp.ops->dma_mask, dma_mask);
                err = -EINVAL;
                goto err_free_nn;
        }

        nn->max_tx_rings = max_tx_rings;
        nn->max_rx_rings = max_rx_rings;

        nn->dp.num_tx_rings = min_t(unsigned int,
                                    max_tx_rings, num_online_cpus());
        nn->dp.num_rx_rings = min_t(unsigned int, max_rx_rings,
                                 netif_get_num_default_rss_queues());

        nn->dp.num_r_vecs = max(nn->dp.num_tx_rings, nn->dp.num_rx_rings);
        nn->dp.num_r_vecs = min_t(unsigned int,
                                  nn->dp.num_r_vecs, num_online_cpus());
        nn->max_r_vecs = nn->dp.num_r_vecs;

        nn->dp.xsk_pools = kzalloc_objs(*nn->dp.xsk_pools, nn->max_r_vecs);
        if (!nn->dp.xsk_pools) {
                err = -ENOMEM;
                goto err_free_nn;
        }

        nn->dp.txd_cnt = NFP_NET_TX_DESCS_DEFAULT;
        nn->dp.rxd_cnt = NFP_NET_RX_DESCS_DEFAULT;

        sema_init(&nn->bar_lock, 1);

        spin_lock_init(&nn->reconfig_lock);
        spin_lock_init(&nn->link_status_lock);

        timer_setup(&nn->reconfig_timer, nfp_net_reconfig_timer, 0);

        err = nfp_net_tlv_caps_parse(&nn->pdev->dev, nn->dp.ctrl_bar,
                                     &nn->tlv_caps);
        if (err)
                goto err_free_xsk_pools;

        err = nfp_ccm_mbox_alloc(nn);
        if (err)
                goto err_free_xsk_pools;

        return nn;

err_free_xsk_pools:
        kfree(nn->dp.xsk_pools);
err_free_nn:
        if (nn->dp.netdev)
                free_netdev(nn->dp.netdev);
        else
                vfree(nn);
        return ERR_PTR(err);
}

/**
 * nfp_net_free() - Undo what @nfp_net_alloc() did
 * @nn:      NFP Net device to reconfigure
 */
void nfp_net_free(struct nfp_net *nn)
{
        WARN_ON(timer_pending(&nn->reconfig_timer) || nn->reconfig_posted);
        nfp_ccm_mbox_free(nn);

        kfree(nn->dp.xsk_pools);
        if (nn->dp.netdev)
                free_netdev(nn->dp.netdev);
        else
                vfree(nn);
}

/**
 * nfp_net_rss_key_sz() - Get current size of the RSS key
 * @nn:         NFP Net device instance
 *
 * Return: size of the RSS key for currently selected hash function.
 */
unsigned int nfp_net_rss_key_sz(struct nfp_net *nn)
{
        switch (nn->rss_hfunc) {
        case ETH_RSS_HASH_TOP:
                return NFP_NET_CFG_RSS_KEY_SZ;
        case ETH_RSS_HASH_XOR:
                return 0;
        case ETH_RSS_HASH_CRC32:
                return 4;
        }

        nn_warn(nn, "Unknown hash function: %u\n", nn->rss_hfunc);
        return 0;
}

/**
 * nfp_net_rss_init() - Set the initial RSS parameters
 * @nn:      NFP Net device to reconfigure
 */
static void nfp_net_rss_init(struct nfp_net *nn)
{
        unsigned long func_bit, rss_cap_hfunc;
        u32 reg;

        /* Read the RSS function capability and select first supported func */
        reg = nn_readl(nn, NFP_NET_CFG_RSS_CAP);
        rss_cap_hfunc = FIELD_GET(NFP_NET_CFG_RSS_CAP_HFUNC, reg);
        if (!rss_cap_hfunc)
                rss_cap_hfunc = FIELD_GET(NFP_NET_CFG_RSS_CAP_HFUNC,
                                          NFP_NET_CFG_RSS_TOEPLITZ);

        func_bit = find_first_bit(&rss_cap_hfunc, NFP_NET_CFG_RSS_HFUNCS);
        if (func_bit == NFP_NET_CFG_RSS_HFUNCS) {
                dev_warn(nn->dp.dev,
                         "Bad RSS config, defaulting to Toeplitz hash\n");
                func_bit = ETH_RSS_HASH_TOP_BIT;
        }
        nn->rss_hfunc = 1 << func_bit;

        netdev_rss_key_fill(nn->rss_key, nfp_net_rss_key_sz(nn));

        nfp_net_rss_init_itbl(nn);

        /* Enable IPv4/IPv6 TCP by default */
        nn->rss_cfg = NFP_NET_CFG_RSS_IPV4_TCP |
                      NFP_NET_CFG_RSS_IPV6_TCP |
                      NFP_NET_CFG_RSS_IPV4_UDP |
                      NFP_NET_CFG_RSS_IPV6_UDP |
                      FIELD_PREP(NFP_NET_CFG_RSS_HFUNC, nn->rss_hfunc) |
                      NFP_NET_CFG_RSS_MASK;
}

/**
 * nfp_net_irqmod_init() - Set the initial IRQ moderation parameters
 * @nn:      NFP Net device to reconfigure
 */
static void nfp_net_irqmod_init(struct nfp_net *nn)
{
        nn->rx_coalesce_usecs      = 50;
        nn->rx_coalesce_max_frames = 64;
        nn->tx_coalesce_usecs      = 50;
        nn->tx_coalesce_max_frames = 64;

        nn->rx_coalesce_adapt_on   = true;
        nn->tx_coalesce_adapt_on   = true;
}

static void nfp_net_netdev_init(struct nfp_net *nn)
{
        struct net_device *netdev = nn->dp.netdev;

        nfp_net_write_mac_addr(nn, nn->dp.netdev->dev_addr);

        netdev->mtu = nn->dp.mtu;

        /* Advertise/enable offloads based on capabilities
         *
         * Note: netdev->features show the currently enabled features
         * and netdev->hw_features advertises which features are
         * supported.  By default we enable most features.
         */
        if (nn->cap & NFP_NET_CFG_CTRL_LIVE_ADDR)
                netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;

        netdev->hw_features = NETIF_F_HIGHDMA;
        if (nn->cap & NFP_NET_CFG_CTRL_RXCSUM_ANY) {
                netdev->hw_features |= NETIF_F_RXCSUM;
                nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_RXCSUM_ANY;
        }
        if (nn->cap & NFP_NET_CFG_CTRL_TXCSUM) {
                netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
                nn->dp.ctrl |= NFP_NET_CFG_CTRL_TXCSUM;
        }
        if (nn->cap & NFP_NET_CFG_CTRL_GATHER) {
                netdev->hw_features |= NETIF_F_SG;
                nn->dp.ctrl |= NFP_NET_CFG_CTRL_GATHER;
        }
        if ((nn->cap & NFP_NET_CFG_CTRL_LSO && nn->fw_ver.major > 2) ||
            nn->cap & NFP_NET_CFG_CTRL_LSO2) {
                netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
                if (nn->cap_w1 & NFP_NET_CFG_CTRL_USO)
                        netdev->hw_features |= NETIF_F_GSO_UDP_L4;
                nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_LSO2 ?:
                                         NFP_NET_CFG_CTRL_LSO;
        }
        if (nn->cap & NFP_NET_CFG_CTRL_RSS_ANY)
                netdev->hw_features |= NETIF_F_RXHASH;

#ifdef CONFIG_NFP_NET_IPSEC
        if (nn->cap_w1 & NFP_NET_CFG_CTRL_IPSEC)
                netdev->hw_features |= NETIF_F_HW_ESP | NETIF_F_HW_ESP_TX_CSUM;
#endif

        if (nn->cap & NFP_NET_CFG_CTRL_VXLAN) {
                if (nn->cap & NFP_NET_CFG_CTRL_LSO) {
                        netdev->hw_features |= NETIF_F_GSO_UDP_TUNNEL |
                                               NETIF_F_GSO_UDP_TUNNEL_CSUM |
                                               NETIF_F_GSO_PARTIAL;
                        netdev->gso_partial_features = NETIF_F_GSO_UDP_TUNNEL_CSUM;
                }
                netdev->udp_tunnel_nic_info = &nfp_udp_tunnels;
                nn->dp.ctrl |= NFP_NET_CFG_CTRL_VXLAN;
        }
        if (nn->cap & NFP_NET_CFG_CTRL_NVGRE) {
                if (nn->cap & NFP_NET_CFG_CTRL_LSO)
                        netdev->hw_features |= NETIF_F_GSO_GRE;
                nn->dp.ctrl |= NFP_NET_CFG_CTRL_NVGRE;
        }
        if (nn->cap & (NFP_NET_CFG_CTRL_VXLAN | NFP_NET_CFG_CTRL_NVGRE))
                netdev->hw_enc_features = netdev->hw_features;

        netdev->vlan_features = netdev->hw_features;

        if (nn->cap & NFP_NET_CFG_CTRL_RXVLAN_ANY) {
                netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_RX;
                nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_RXVLAN_V2 ?:
                               NFP_NET_CFG_CTRL_RXVLAN;
        }
        if (nn->cap & NFP_NET_CFG_CTRL_TXVLAN_ANY) {
                if (nn->cap & NFP_NET_CFG_CTRL_LSO2) {
                        nn_warn(nn, "Device advertises both TSO2 and TXVLAN. Refusing to enable TXVLAN.\n");
                } else {
                        netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX;
                        nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_TXVLAN_V2 ?:
                                       NFP_NET_CFG_CTRL_TXVLAN;
                }
        }
        if (nn->cap & NFP_NET_CFG_CTRL_CTAG_FILTER) {
                netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_FILTER;
                nn->dp.ctrl |= NFP_NET_CFG_CTRL_CTAG_FILTER;
        }
        if (nn->cap & NFP_NET_CFG_CTRL_RXQINQ) {
                netdev->hw_features |= NETIF_F_HW_VLAN_STAG_RX;
                nn->dp.ctrl |= NFP_NET_CFG_CTRL_RXQINQ;
        }

        netdev->features = netdev->hw_features;

        if (nfp_app_has_tc(nn->app) && nn->port)
                netdev->hw_features |= NETIF_F_HW_TC;

        /* C-Tag strip and S-Tag strip can't be supported simultaneously,
         * so enable C-Tag strip and disable S-Tag strip by default.
         */
        netdev->features &= ~NETIF_F_HW_VLAN_STAG_RX;
        nn->dp.ctrl &= ~NFP_NET_CFG_CTRL_RXQINQ;

        netdev->xdp_features = NETDEV_XDP_ACT_BASIC;
        if (nn->app && nn->app->type->id == NFP_APP_BPF_NIC)
                netdev->xdp_features |= NETDEV_XDP_ACT_HW_OFFLOAD;

        /* Finalise the netdev setup */
        switch (nn->dp.ops->version) {
        case NFP_NFD_VER_NFD3:
                netdev->netdev_ops = &nfp_nfd3_netdev_ops;
                netdev->xdp_features |= NETDEV_XDP_ACT_XSK_ZEROCOPY;
                netdev->xdp_features |= NETDEV_XDP_ACT_REDIRECT;
                break;
        case NFP_NFD_VER_NFDK:
                netdev->netdev_ops = &nfp_nfdk_netdev_ops;
                break;
        }

        netdev->watchdog_timeo = secs_to_jiffies(5);

        /* MTU range: 68 - hw-specific max */
        netdev->min_mtu = ETH_MIN_MTU;
        netdev->max_mtu = nn->max_mtu;

        netif_set_tso_max_segs(netdev, NFP_NET_LSO_MAX_SEGS);

        netif_carrier_off(netdev);

        nfp_net_set_ethtool_ops(netdev);
}

static int nfp_net_read_caps(struct nfp_net *nn)
{
        /* Get some of the read-only fields from the BAR */
        nn->cap = nn_readl(nn, NFP_NET_CFG_CAP);
        nn->cap_w1 = nn_readl(nn, NFP_NET_CFG_CAP_WORD1);
        nn->max_mtu = nn_readl(nn, NFP_NET_CFG_MAX_MTU);

        /* ABI 4.x and ctrl vNIC always use chained metadata, in other cases
         * we allow use of non-chained metadata if RSS(v1) is the only
         * advertised capability requiring metadata.
         */
        nn->dp.chained_metadata_format = nn->fw_ver.major == 4 ||
                                         !nn->dp.netdev ||
                                         !(nn->cap & NFP_NET_CFG_CTRL_RSS) ||
                                         nn->cap & NFP_NET_CFG_CTRL_CHAIN_META;
        /* RSS(v1) uses non-chained metadata format, except in ABI 4.x where
         * it has the same meaning as RSSv2.
         */
        if (nn->dp.chained_metadata_format && nn->fw_ver.major != 4)
                nn->cap &= ~NFP_NET_CFG_CTRL_RSS;

        /* Determine RX packet/metadata boundary offset */
        if (nn->fw_ver.major >= 2) {
                u32 reg;

                reg = nn_readl(nn, NFP_NET_CFG_RX_OFFSET);
                if (reg > NFP_NET_MAX_PREPEND) {
                        nn_err(nn, "Invalid rx offset: %d\n", reg);
                        return -EINVAL;
                }
                nn->dp.rx_offset = reg;
        } else {
                nn->dp.rx_offset = NFP_NET_RX_OFFSET;
        }

        /* Mask out NFD-version-specific features */
        nn->cap &= nn->dp.ops->cap_mask;

        /* For control vNICs mask out the capabilities app doesn't want. */
        if (!nn->dp.netdev)
                nn->cap &= nn->app->type->ctrl_cap_mask;

        return 0;
}

/**
 * nfp_net_init() - Initialise/finalise the nfp_net structure
 * @nn:         NFP Net device structure
 *
 * Return: 0 on success or negative errno on error.
 */
int nfp_net_init(struct nfp_net *nn)
{
        int err;

        nn->dp.rx_dma_dir = DMA_FROM_DEVICE;

        err = nfp_net_read_caps(nn);
        if (err)
                return err;

        /* Set default MTU and Freelist buffer size */
        if (!nfp_net_is_data_vnic(nn) && nn->app->ctrl_mtu) {
                nn->dp.mtu = min(nn->app->ctrl_mtu, nn->max_mtu);
        } else if (nn->max_mtu < NFP_NET_DEFAULT_MTU) {
                nn->dp.mtu = nn->max_mtu;
        } else {
                nn->dp.mtu = NFP_NET_DEFAULT_MTU;
        }
        nn->dp.fl_bufsz = nfp_net_calc_fl_bufsz(&nn->dp);

        if (nfp_app_ctrl_uses_data_vnics(nn->app))
                nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_CMSG_DATA;

        if (nn->cap & NFP_NET_CFG_CTRL_RSS_ANY) {
                nfp_net_rss_init(nn);
                nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_RSS2 ?:
                                         NFP_NET_CFG_CTRL_RSS;
        }

        /* Allow L2 Broadcast and Multicast through by default, if supported */
        if (nn->cap & NFP_NET_CFG_CTRL_L2BC)
                nn->dp.ctrl |= NFP_NET_CFG_CTRL_L2BC;

        /* Allow IRQ moderation, if supported */
        if (nn->cap & NFP_NET_CFG_CTRL_IRQMOD) {
                nfp_net_irqmod_init(nn);
                nn->dp.ctrl |= NFP_NET_CFG_CTRL_IRQMOD;
        }

        /* Enable TX pointer writeback, if supported */
        if (nn->cap & NFP_NET_CFG_CTRL_TXRWB)
                nn->dp.ctrl |= NFP_NET_CFG_CTRL_TXRWB;

        if (nn->cap_w1 & NFP_NET_CFG_CTRL_MCAST_FILTER)
                nn->dp.ctrl_w1 |= NFP_NET_CFG_CTRL_MCAST_FILTER;

        /* Stash the re-configuration queue away.  First odd queue in TX Bar */
        nn->qcp_cfg = nn->tx_bar + NFP_QCP_QUEUE_ADDR_SZ;

        /* Make sure the FW knows the netdev is supposed to be disabled here */
        nn_writel(nn, NFP_NET_CFG_CTRL, 0);
        nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, 0);
        nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, 0);
        nn_writel(nn, NFP_NET_CFG_CTRL_WORD1, 0);
        err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_RING |
                                   NFP_NET_CFG_UPDATE_GEN);
        if (err)
                return err;

        if (nn->dp.netdev) {
                nfp_net_netdev_init(nn);

                err = nfp_ccm_mbox_init(nn);
                if (err)
                        return err;

                err = nfp_net_tls_init(nn);
                if (err)
                        goto err_clean_mbox;

                nfp_net_ipsec_init(nn);
        }

        nfp_net_vecs_init(nn);

        if (!nn->dp.netdev)
                return 0;

        spin_lock_init(&nn->mbox_amsg.lock);
        INIT_LIST_HEAD(&nn->mbox_amsg.list);
        INIT_WORK(&nn->mbox_amsg.work, nfp_net_mbox_amsg_work);

        INIT_LIST_HEAD(&nn->fs.list);

        return register_netdev(nn->dp.netdev);

err_clean_mbox:
        nfp_ccm_mbox_clean(nn);
        return err;
}

/**
 * nfp_net_clean() - Undo what nfp_net_init() did.
 * @nn:         NFP Net device structure
 */
void nfp_net_clean(struct nfp_net *nn)
{
        if (!nn->dp.netdev)
                return;

        unregister_netdev(nn->dp.netdev);
        nfp_net_ipsec_clean(nn);
        nfp_ccm_mbox_clean(nn);
        nfp_net_fs_clean(nn);
        flush_work(&nn->mbox_amsg.work);
        nfp_net_reconfig_wait_posted(nn);
}