net: mana: Fix the tso_bytes calculation

[thirdparty/linux.git] / drivers / net / ethernet / microsoft / mana / mana_en.c

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/* Copyright (c) 2021, Microsoft Corporation. */

#include <uapi/linux/bpf.h>

#include <linux/inetdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/filter.h>
#include <linux/mm.h>
#include <linux/pci.h>

#include <net/checksum.h>
#include <net/ip6_checksum.h>
#include <net/page_pool/helpers.h>
#include <net/xdp.h>

#include <net/mana/mana.h>
#include <net/mana/mana_auxiliary.h>

static DEFINE_IDA(mana_adev_ida);

static int mana_adev_idx_alloc(void)
{
        return ida_alloc(&mana_adev_ida, GFP_KERNEL);
}

static void mana_adev_idx_free(int idx)
{
        ida_free(&mana_adev_ida, idx);
}

/* Microsoft Azure Network Adapter (MANA) functions */

static int mana_open(struct net_device *ndev)
{
        struct mana_port_context *apc = netdev_priv(ndev);
        int err;

        err = mana_alloc_queues(ndev);
        if (err)
                return err;

        apc->port_is_up = true;

        /* Ensure port state updated before txq state */
        smp_wmb();

        netif_carrier_on(ndev);
        netif_tx_wake_all_queues(ndev);

        return 0;
}

static int mana_close(struct net_device *ndev)
{
        struct mana_port_context *apc = netdev_priv(ndev);

        if (!apc->port_is_up)
                return 0;

        return mana_detach(ndev, true);
}

static bool mana_can_tx(struct gdma_queue *wq)
{
        return mana_gd_wq_avail_space(wq) >= MAX_TX_WQE_SIZE;
}

static unsigned int mana_checksum_info(struct sk_buff *skb)
{
        if (skb->protocol == htons(ETH_P_IP)) {
                struct iphdr *ip = ip_hdr(skb);

                if (ip->protocol == IPPROTO_TCP)
                        return IPPROTO_TCP;

                if (ip->protocol == IPPROTO_UDP)
                        return IPPROTO_UDP;
        } else if (skb->protocol == htons(ETH_P_IPV6)) {
                struct ipv6hdr *ip6 = ipv6_hdr(skb);

                if (ip6->nexthdr == IPPROTO_TCP)
                        return IPPROTO_TCP;

                if (ip6->nexthdr == IPPROTO_UDP)
                        return IPPROTO_UDP;
        }

        /* No csum offloading */
        return 0;
}

static int mana_map_skb(struct sk_buff *skb, struct mana_port_context *apc,
                        struct mana_tx_package *tp)
{
        struct mana_skb_head *ash = (struct mana_skb_head *)skb->head;
        struct gdma_dev *gd = apc->ac->gdma_dev;
        struct gdma_context *gc;
        struct device *dev;
        skb_frag_t *frag;
        dma_addr_t da;
        int i;

        gc = gd->gdma_context;
        dev = gc->dev;
        da = dma_map_single(dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);

        if (dma_mapping_error(dev, da))
                return -ENOMEM;

        ash->dma_handle[0] = da;
        ash->size[0] = skb_headlen(skb);

        tp->wqe_req.sgl[0].address = ash->dma_handle[0];
        tp->wqe_req.sgl[0].mem_key = gd->gpa_mkey;
        tp->wqe_req.sgl[0].size = ash->size[0];

        for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
                frag = &skb_shinfo(skb)->frags[i];
                da = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
                                      DMA_TO_DEVICE);

                if (dma_mapping_error(dev, da))
                        goto frag_err;

                ash->dma_handle[i + 1] = da;
                ash->size[i + 1] = skb_frag_size(frag);

                tp->wqe_req.sgl[i + 1].address = ash->dma_handle[i + 1];
                tp->wqe_req.sgl[i + 1].mem_key = gd->gpa_mkey;
                tp->wqe_req.sgl[i + 1].size = ash->size[i + 1];
        }

        return 0;

frag_err:
        for (i = i - 1; i >= 0; i--)
                dma_unmap_page(dev, ash->dma_handle[i + 1], ash->size[i + 1],
                               DMA_TO_DEVICE);

        dma_unmap_single(dev, ash->dma_handle[0], ash->size[0], DMA_TO_DEVICE);

        return -ENOMEM;
}

netdev_tx_t mana_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
        enum mana_tx_pkt_format pkt_fmt = MANA_SHORT_PKT_FMT;
        struct mana_port_context *apc = netdev_priv(ndev);
        u16 txq_idx = skb_get_queue_mapping(skb);
        struct gdma_dev *gd = apc->ac->gdma_dev;
        bool ipv4 = false, ipv6 = false;
        struct mana_tx_package pkg = {};
        struct netdev_queue *net_txq;
        struct mana_stats_tx *tx_stats;
        struct gdma_queue *gdma_sq;
        unsigned int csum_type;
        struct mana_txq *txq;
        struct mana_cq *cq;
        int err, len;
        u16 ihs;

        if (unlikely(!apc->port_is_up))
                goto tx_drop;

        if (skb_cow_head(skb, MANA_HEADROOM))
                goto tx_drop_count;

        txq = &apc->tx_qp[txq_idx].txq;
        gdma_sq = txq->gdma_sq;
        cq = &apc->tx_qp[txq_idx].tx_cq;
        tx_stats = &txq->stats;

        pkg.tx_oob.s_oob.vcq_num = cq->gdma_id;
        pkg.tx_oob.s_oob.vsq_frame = txq->vsq_frame;

        if (txq->vp_offset > MANA_SHORT_VPORT_OFFSET_MAX) {
                pkg.tx_oob.l_oob.long_vp_offset = txq->vp_offset;
                pkt_fmt = MANA_LONG_PKT_FMT;
        } else {
                pkg.tx_oob.s_oob.short_vp_offset = txq->vp_offset;
        }

        if (skb_vlan_tag_present(skb)) {
                pkt_fmt = MANA_LONG_PKT_FMT;
                pkg.tx_oob.l_oob.inject_vlan_pri_tag = 1;
                pkg.tx_oob.l_oob.pcp = skb_vlan_tag_get_prio(skb);
                pkg.tx_oob.l_oob.dei = skb_vlan_tag_get_cfi(skb);
                pkg.tx_oob.l_oob.vlan_id = skb_vlan_tag_get_id(skb);
        }

        pkg.tx_oob.s_oob.pkt_fmt = pkt_fmt;

        if (pkt_fmt == MANA_SHORT_PKT_FMT) {
                pkg.wqe_req.inline_oob_size = sizeof(struct mana_tx_short_oob);
                u64_stats_update_begin(&tx_stats->syncp);
                tx_stats->short_pkt_fmt++;
                u64_stats_update_end(&tx_stats->syncp);
        } else {
                pkg.wqe_req.inline_oob_size = sizeof(struct mana_tx_oob);
                u64_stats_update_begin(&tx_stats->syncp);
                tx_stats->long_pkt_fmt++;
                u64_stats_update_end(&tx_stats->syncp);
        }

        pkg.wqe_req.inline_oob_data = &pkg.tx_oob;
        pkg.wqe_req.flags = 0;
        pkg.wqe_req.client_data_unit = 0;

        pkg.wqe_req.num_sge = 1 + skb_shinfo(skb)->nr_frags;
        WARN_ON_ONCE(pkg.wqe_req.num_sge > MAX_TX_WQE_SGL_ENTRIES);

        if (pkg.wqe_req.num_sge <= ARRAY_SIZE(pkg.sgl_array)) {
                pkg.wqe_req.sgl = pkg.sgl_array;
        } else {
                pkg.sgl_ptr = kmalloc_array(pkg.wqe_req.num_sge,
                                            sizeof(struct gdma_sge),
                                            GFP_ATOMIC);
                if (!pkg.sgl_ptr)
                        goto tx_drop_count;

                pkg.wqe_req.sgl = pkg.sgl_ptr;
        }

        if (skb->protocol == htons(ETH_P_IP))
                ipv4 = true;
        else if (skb->protocol == htons(ETH_P_IPV6))
                ipv6 = true;

        if (skb_is_gso(skb)) {
                pkg.tx_oob.s_oob.is_outer_ipv4 = ipv4;
                pkg.tx_oob.s_oob.is_outer_ipv6 = ipv6;

                pkg.tx_oob.s_oob.comp_iphdr_csum = 1;
                pkg.tx_oob.s_oob.comp_tcp_csum = 1;
                pkg.tx_oob.s_oob.trans_off = skb_transport_offset(skb);

                pkg.wqe_req.client_data_unit = skb_shinfo(skb)->gso_size;
                pkg.wqe_req.flags = GDMA_WR_OOB_IN_SGL | GDMA_WR_PAD_BY_SGE0;
                if (ipv4) {
                        ip_hdr(skb)->tot_len = 0;
                        ip_hdr(skb)->check = 0;
                        tcp_hdr(skb)->check =
                                ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
                                                   ip_hdr(skb)->daddr, 0,
                                                   IPPROTO_TCP, 0);
                } else {
                        ipv6_hdr(skb)->payload_len = 0;
                        tcp_hdr(skb)->check =
                                ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
                                                 &ipv6_hdr(skb)->daddr, 0,
                                                 IPPROTO_TCP, 0);
                }

                if (skb->encapsulation) {
                        ihs = skb_inner_tcp_all_headers(skb);
                        u64_stats_update_begin(&tx_stats->syncp);
                        tx_stats->tso_inner_packets++;
                        tx_stats->tso_inner_bytes += skb->len - ihs;
                        u64_stats_update_end(&tx_stats->syncp);
                } else {
                        if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) {
                                ihs = skb_transport_offset(skb) + sizeof(struct udphdr);
                        } else {
                                ihs = skb_tcp_all_headers(skb);
                        }

                        u64_stats_update_begin(&tx_stats->syncp);
                        tx_stats->tso_packets++;
                        tx_stats->tso_bytes += skb->len - ihs;
                        u64_stats_update_end(&tx_stats->syncp);
                }

        } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
                csum_type = mana_checksum_info(skb);

                u64_stats_update_begin(&tx_stats->syncp);
                tx_stats->csum_partial++;
                u64_stats_update_end(&tx_stats->syncp);

                if (csum_type == IPPROTO_TCP) {
                        pkg.tx_oob.s_oob.is_outer_ipv4 = ipv4;
                        pkg.tx_oob.s_oob.is_outer_ipv6 = ipv6;

                        pkg.tx_oob.s_oob.comp_tcp_csum = 1;
                        pkg.tx_oob.s_oob.trans_off = skb_transport_offset(skb);

                } else if (csum_type == IPPROTO_UDP) {
                        pkg.tx_oob.s_oob.is_outer_ipv4 = ipv4;
                        pkg.tx_oob.s_oob.is_outer_ipv6 = ipv6;

                        pkg.tx_oob.s_oob.comp_udp_csum = 1;
                } else {
                        /* Can't do offload of this type of checksum */
                        if (skb_checksum_help(skb))
                                goto free_sgl_ptr;
                }
        }

        if (mana_map_skb(skb, apc, &pkg)) {
                u64_stats_update_begin(&tx_stats->syncp);
                tx_stats->mana_map_err++;
                u64_stats_update_end(&tx_stats->syncp);
                goto free_sgl_ptr;
        }

        skb_queue_tail(&txq->pending_skbs, skb);

        len = skb->len;
        net_txq = netdev_get_tx_queue(ndev, txq_idx);

        err = mana_gd_post_work_request(gdma_sq, &pkg.wqe_req,
                                        (struct gdma_posted_wqe_info *)skb->cb);
        if (!mana_can_tx(gdma_sq)) {
                netif_tx_stop_queue(net_txq);
                apc->eth_stats.stop_queue++;
        }

        if (err) {
                (void)skb_dequeue_tail(&txq->pending_skbs);
                netdev_warn(ndev, "Failed to post TX OOB: %d\n", err);
                err = NETDEV_TX_BUSY;
                goto tx_busy;
        }

        err = NETDEV_TX_OK;
        atomic_inc(&txq->pending_sends);

        mana_gd_wq_ring_doorbell(gd->gdma_context, gdma_sq);

        /* skb may be freed after mana_gd_post_work_request. Do not use it. */
        skb = NULL;

        tx_stats = &txq->stats;
        u64_stats_update_begin(&tx_stats->syncp);
        tx_stats->packets++;
        tx_stats->bytes += len;
        u64_stats_update_end(&tx_stats->syncp);

tx_busy:
        if (netif_tx_queue_stopped(net_txq) && mana_can_tx(gdma_sq)) {
                netif_tx_wake_queue(net_txq);
                apc->eth_stats.wake_queue++;
        }

        kfree(pkg.sgl_ptr);
        return err;

free_sgl_ptr:
        kfree(pkg.sgl_ptr);
tx_drop_count:
        ndev->stats.tx_dropped++;
tx_drop:
        dev_kfree_skb_any(skb);
        return NETDEV_TX_OK;
}

static void mana_get_stats64(struct net_device *ndev,
                             struct rtnl_link_stats64 *st)
{
        struct mana_port_context *apc = netdev_priv(ndev);
        unsigned int num_queues = apc->num_queues;
        struct mana_stats_rx *rx_stats;
        struct mana_stats_tx *tx_stats;
        unsigned int start;
        u64 packets, bytes;
        int q;

        if (!apc->port_is_up)
                return;

        netdev_stats_to_stats64(st, &ndev->stats);

        for (q = 0; q < num_queues; q++) {
                rx_stats = &apc->rxqs[q]->stats;

                do {
                        start = u64_stats_fetch_begin(&rx_stats->syncp);
                        packets = rx_stats->packets;
                        bytes = rx_stats->bytes;
                } while (u64_stats_fetch_retry(&rx_stats->syncp, start));

                st->rx_packets += packets;
                st->rx_bytes += bytes;
        }

        for (q = 0; q < num_queues; q++) {
                tx_stats = &apc->tx_qp[q].txq.stats;

                do {
                        start = u64_stats_fetch_begin(&tx_stats->syncp);
                        packets = tx_stats->packets;
                        bytes = tx_stats->bytes;
                } while (u64_stats_fetch_retry(&tx_stats->syncp, start));

                st->tx_packets += packets;
                st->tx_bytes += bytes;
        }
}

static int mana_get_tx_queue(struct net_device *ndev, struct sk_buff *skb,
                             int old_q)
{
        struct mana_port_context *apc = netdev_priv(ndev);
        u32 hash = skb_get_hash(skb);
        struct sock *sk = skb->sk;
        int txq;

        txq = apc->indir_table[hash & MANA_INDIRECT_TABLE_MASK];

        if (txq != old_q && sk && sk_fullsock(sk) &&
            rcu_access_pointer(sk->sk_dst_cache))
                sk_tx_queue_set(sk, txq);

        return txq;
}

static u16 mana_select_queue(struct net_device *ndev, struct sk_buff *skb,
                             struct net_device *sb_dev)
{
        int txq;

        if (ndev->real_num_tx_queues == 1)
                return 0;

        txq = sk_tx_queue_get(skb->sk);

        if (txq < 0 || skb->ooo_okay || txq >= ndev->real_num_tx_queues) {
                if (skb_rx_queue_recorded(skb))
                        txq = skb_get_rx_queue(skb);
                else
                        txq = mana_get_tx_queue(ndev, skb, txq);
        }

        return txq;
}

/* Release pre-allocated RX buffers */
static void mana_pre_dealloc_rxbufs(struct mana_port_context *mpc)
{
        struct device *dev;
        int i;

        dev = mpc->ac->gdma_dev->gdma_context->dev;

        if (!mpc->rxbufs_pre)
                goto out1;

        if (!mpc->das_pre)
                goto out2;

        while (mpc->rxbpre_total) {
                i = --mpc->rxbpre_total;
                dma_unmap_single(dev, mpc->das_pre[i], mpc->rxbpre_datasize,
                                 DMA_FROM_DEVICE);
                put_page(virt_to_head_page(mpc->rxbufs_pre[i]));
        }

        kfree(mpc->das_pre);
        mpc->das_pre = NULL;

out2:
        kfree(mpc->rxbufs_pre);
        mpc->rxbufs_pre = NULL;

out1:
        mpc->rxbpre_datasize = 0;
        mpc->rxbpre_alloc_size = 0;
        mpc->rxbpre_headroom = 0;
}

/* Get a buffer from the pre-allocated RX buffers */
static void *mana_get_rxbuf_pre(struct mana_rxq *rxq, dma_addr_t *da)
{
        struct net_device *ndev = rxq->ndev;
        struct mana_port_context *mpc;
        void *va;

        mpc = netdev_priv(ndev);

        if (!mpc->rxbufs_pre || !mpc->das_pre || !mpc->rxbpre_total) {
                netdev_err(ndev, "No RX pre-allocated bufs\n");
                return NULL;
        }

        /* Check sizes to catch unexpected coding error */
        if (mpc->rxbpre_datasize != rxq->datasize) {
                netdev_err(ndev, "rxbpre_datasize mismatch: %u: %u\n",
                           mpc->rxbpre_datasize, rxq->datasize);
                return NULL;
        }

        if (mpc->rxbpre_alloc_size != rxq->alloc_size) {
                netdev_err(ndev, "rxbpre_alloc_size mismatch: %u: %u\n",
                           mpc->rxbpre_alloc_size, rxq->alloc_size);
                return NULL;
        }

        if (mpc->rxbpre_headroom != rxq->headroom) {
                netdev_err(ndev, "rxbpre_headroom mismatch: %u: %u\n",
                           mpc->rxbpre_headroom, rxq->headroom);
                return NULL;
        }

        mpc->rxbpre_total--;

        *da = mpc->das_pre[mpc->rxbpre_total];
        va = mpc->rxbufs_pre[mpc->rxbpre_total];
        mpc->rxbufs_pre[mpc->rxbpre_total] = NULL;

        /* Deallocate the array after all buffers are gone */
        if (!mpc->rxbpre_total)
                mana_pre_dealloc_rxbufs(mpc);

        return va;
}

/* Get RX buffer's data size, alloc size, XDP headroom based on MTU */
static void mana_get_rxbuf_cfg(int mtu, u32 *datasize, u32 *alloc_size,
                               u32 *headroom)
{
        if (mtu > MANA_XDP_MTU_MAX)
                *headroom = 0; /* no support for XDP */
        else
                *headroom = XDP_PACKET_HEADROOM;

        *alloc_size = mtu + MANA_RXBUF_PAD + *headroom;

        *datasize = ALIGN(mtu + ETH_HLEN, MANA_RX_DATA_ALIGN);
}

static int mana_pre_alloc_rxbufs(struct mana_port_context *mpc, int new_mtu)
{
        struct device *dev;
        struct page *page;
        dma_addr_t da;
        int num_rxb;
        void *va;
        int i;

        mana_get_rxbuf_cfg(new_mtu, &mpc->rxbpre_datasize,
                           &mpc->rxbpre_alloc_size, &mpc->rxbpre_headroom);

        dev = mpc->ac->gdma_dev->gdma_context->dev;

        num_rxb = mpc->num_queues * RX_BUFFERS_PER_QUEUE;

        WARN(mpc->rxbufs_pre, "mana rxbufs_pre exists\n");
        mpc->rxbufs_pre = kmalloc_array(num_rxb, sizeof(void *), GFP_KERNEL);
        if (!mpc->rxbufs_pre)
                goto error;

        mpc->das_pre = kmalloc_array(num_rxb, sizeof(dma_addr_t), GFP_KERNEL);
        if (!mpc->das_pre)
                goto error;

        mpc->rxbpre_total = 0;

        for (i = 0; i < num_rxb; i++) {
                if (mpc->rxbpre_alloc_size > PAGE_SIZE) {
                        va = netdev_alloc_frag(mpc->rxbpre_alloc_size);
                        if (!va)
                                goto error;

                        page = virt_to_head_page(va);
                        /* Check if the frag falls back to single page */
                        if (compound_order(page) <
                            get_order(mpc->rxbpre_alloc_size)) {
                                put_page(page);
                                goto error;
                        }
                } else {
                        page = dev_alloc_page();
                        if (!page)
                                goto error;

                        va = page_to_virt(page);
                }

                da = dma_map_single(dev, va + mpc->rxbpre_headroom,
                                    mpc->rxbpre_datasize, DMA_FROM_DEVICE);
                if (dma_mapping_error(dev, da)) {
                        put_page(virt_to_head_page(va));
                        goto error;
                }

                mpc->rxbufs_pre[i] = va;
                mpc->das_pre[i] = da;
                mpc->rxbpre_total = i + 1;
        }

        return 0;

error:
        mana_pre_dealloc_rxbufs(mpc);
        return -ENOMEM;
}

static int mana_change_mtu(struct net_device *ndev, int new_mtu)
{
        struct mana_port_context *mpc = netdev_priv(ndev);
        unsigned int old_mtu = ndev->mtu;
        int err;

        /* Pre-allocate buffers to prevent failure in mana_attach later */
        err = mana_pre_alloc_rxbufs(mpc, new_mtu);
        if (err) {
                netdev_err(ndev, "Insufficient memory for new MTU\n");
                return err;
        }

        err = mana_detach(ndev, false);
        if (err) {
                netdev_err(ndev, "mana_detach failed: %d\n", err);
                goto out;
        }

        ndev->mtu = new_mtu;

        err = mana_attach(ndev);
        if (err) {
                netdev_err(ndev, "mana_attach failed: %d\n", err);
                ndev->mtu = old_mtu;
        }

out:
        mana_pre_dealloc_rxbufs(mpc);
        return err;
}

static const struct net_device_ops mana_devops = {
        .ndo_open               = mana_open,
        .ndo_stop               = mana_close,
        .ndo_select_queue       = mana_select_queue,
        .ndo_start_xmit         = mana_start_xmit,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_get_stats64        = mana_get_stats64,
        .ndo_bpf                = mana_bpf,
        .ndo_xdp_xmit           = mana_xdp_xmit,
        .ndo_change_mtu         = mana_change_mtu,
};

static void mana_cleanup_port_context(struct mana_port_context *apc)
{
        kfree(apc->rxqs);
        apc->rxqs = NULL;
}

static int mana_init_port_context(struct mana_port_context *apc)
{
        apc->rxqs = kcalloc(apc->num_queues, sizeof(struct mana_rxq *),
                            GFP_KERNEL);

        return !apc->rxqs ? -ENOMEM : 0;
}

static int mana_send_request(struct mana_context *ac, void *in_buf,
                             u32 in_len, void *out_buf, u32 out_len)
{
        struct gdma_context *gc = ac->gdma_dev->gdma_context;
        struct gdma_resp_hdr *resp = out_buf;
        struct gdma_req_hdr *req = in_buf;
        struct device *dev = gc->dev;
        static atomic_t activity_id;
        int err;

        req->dev_id = gc->mana.dev_id;
        req->activity_id = atomic_inc_return(&activity_id);

        err = mana_gd_send_request(gc, in_len, in_buf, out_len,
                                   out_buf);
        if (err || resp->status) {
                dev_err(dev, "Failed to send mana message: %d, 0x%x\n",
                        err, resp->status);
                return err ? err : -EPROTO;
        }

        if (req->dev_id.as_uint32 != resp->dev_id.as_uint32 ||
            req->activity_id != resp->activity_id) {
                dev_err(dev, "Unexpected mana message response: %x,%x,%x,%x\n",
                        req->dev_id.as_uint32, resp->dev_id.as_uint32,
                        req->activity_id, resp->activity_id);
                return -EPROTO;
        }

        return 0;
}

static int mana_verify_resp_hdr(const struct gdma_resp_hdr *resp_hdr,
                                const enum mana_command_code expected_code,
                                const u32 min_size)
{
        if (resp_hdr->response.msg_type != expected_code)
                return -EPROTO;

        if (resp_hdr->response.msg_version < GDMA_MESSAGE_V1)
                return -EPROTO;

        if (resp_hdr->response.msg_size < min_size)
                return -EPROTO;

        return 0;
}

static int mana_pf_register_hw_vport(struct mana_port_context *apc)
{
        struct mana_register_hw_vport_resp resp = {};
        struct mana_register_hw_vport_req req = {};
        int err;

        mana_gd_init_req_hdr(&req.hdr, MANA_REGISTER_HW_PORT,
                             sizeof(req), sizeof(resp));
        req.attached_gfid = 1;
        req.is_pf_default_vport = 1;
        req.allow_all_ether_types = 1;

        err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
                                sizeof(resp));
        if (err) {
                netdev_err(apc->ndev, "Failed to register hw vPort: %d\n", err);
                return err;
        }

        err = mana_verify_resp_hdr(&resp.hdr, MANA_REGISTER_HW_PORT,
                                   sizeof(resp));
        if (err || resp.hdr.status) {
                netdev_err(apc->ndev, "Failed to register hw vPort: %d, 0x%x\n",
                           err, resp.hdr.status);
                return err ? err : -EPROTO;
        }

        apc->port_handle = resp.hw_vport_handle;
        return 0;
}

static void mana_pf_deregister_hw_vport(struct mana_port_context *apc)
{
        struct mana_deregister_hw_vport_resp resp = {};
        struct mana_deregister_hw_vport_req req = {};
        int err;

        mana_gd_init_req_hdr(&req.hdr, MANA_DEREGISTER_HW_PORT,
                             sizeof(req), sizeof(resp));
        req.hw_vport_handle = apc->port_handle;

        err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
                                sizeof(resp));
        if (err) {
                netdev_err(apc->ndev, "Failed to unregister hw vPort: %d\n",
                           err);
                return;
        }

        err = mana_verify_resp_hdr(&resp.hdr, MANA_DEREGISTER_HW_PORT,
                                   sizeof(resp));
        if (err || resp.hdr.status)
                netdev_err(apc->ndev,
                           "Failed to deregister hw vPort: %d, 0x%x\n",
                           err, resp.hdr.status);
}

static int mana_pf_register_filter(struct mana_port_context *apc)
{
        struct mana_register_filter_resp resp = {};
        struct mana_register_filter_req req = {};
        int err;

        mana_gd_init_req_hdr(&req.hdr, MANA_REGISTER_FILTER,
                             sizeof(req), sizeof(resp));
        req.vport = apc->port_handle;
        memcpy(req.mac_addr, apc->mac_addr, ETH_ALEN);

        err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
                                sizeof(resp));
        if (err) {
                netdev_err(apc->ndev, "Failed to register filter: %d\n", err);
                return err;
        }

        err = mana_verify_resp_hdr(&resp.hdr, MANA_REGISTER_FILTER,
                                   sizeof(resp));
        if (err || resp.hdr.status) {
                netdev_err(apc->ndev, "Failed to register filter: %d, 0x%x\n",
                           err, resp.hdr.status);
                return err ? err : -EPROTO;
        }

        apc->pf_filter_handle = resp.filter_handle;
        return 0;
}

static void mana_pf_deregister_filter(struct mana_port_context *apc)
{
        struct mana_deregister_filter_resp resp = {};
        struct mana_deregister_filter_req req = {};
        int err;

        mana_gd_init_req_hdr(&req.hdr, MANA_DEREGISTER_FILTER,
                             sizeof(req), sizeof(resp));
        req.filter_handle = apc->pf_filter_handle;

        err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
                                sizeof(resp));
        if (err) {
                netdev_err(apc->ndev, "Failed to unregister filter: %d\n",
                           err);
                return;
        }

        err = mana_verify_resp_hdr(&resp.hdr, MANA_DEREGISTER_FILTER,
                                   sizeof(resp));
        if (err || resp.hdr.status)
                netdev_err(apc->ndev,
                           "Failed to deregister filter: %d, 0x%x\n",
                           err, resp.hdr.status);
}

static int mana_query_device_cfg(struct mana_context *ac, u32 proto_major_ver,
                                 u32 proto_minor_ver, u32 proto_micro_ver,
                                 u16 *max_num_vports)
{
        struct gdma_context *gc = ac->gdma_dev->gdma_context;
        struct mana_query_device_cfg_resp resp = {};
        struct mana_query_device_cfg_req req = {};
        struct device *dev = gc->dev;
        int err = 0;

        mana_gd_init_req_hdr(&req.hdr, MANA_QUERY_DEV_CONFIG,
                             sizeof(req), sizeof(resp));

        req.hdr.resp.msg_version = GDMA_MESSAGE_V2;

        req.proto_major_ver = proto_major_ver;
        req.proto_minor_ver = proto_minor_ver;
        req.proto_micro_ver = proto_micro_ver;

        err = mana_send_request(ac, &req, sizeof(req), &resp, sizeof(resp));
        if (err) {
                dev_err(dev, "Failed to query config: %d", err);
                return err;
        }

        err = mana_verify_resp_hdr(&resp.hdr, MANA_QUERY_DEV_CONFIG,
                                   sizeof(resp));
        if (err || resp.hdr.status) {
                dev_err(dev, "Invalid query result: %d, 0x%x\n", err,
                        resp.hdr.status);
                if (!err)
                        err = -EPROTO;
                return err;
        }

        *max_num_vports = resp.max_num_vports;

        if (resp.hdr.response.msg_version == GDMA_MESSAGE_V2)
                gc->adapter_mtu = resp.adapter_mtu;
        else
                gc->adapter_mtu = ETH_FRAME_LEN;

        return 0;
}

static int mana_query_vport_cfg(struct mana_port_context *apc, u32 vport_index,
                                u32 *max_sq, u32 *max_rq, u32 *num_indir_entry)
{
        struct mana_query_vport_cfg_resp resp = {};
        struct mana_query_vport_cfg_req req = {};
        int err;

        mana_gd_init_req_hdr(&req.hdr, MANA_QUERY_VPORT_CONFIG,
                             sizeof(req), sizeof(resp));

        req.vport_index = vport_index;

        err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
                                sizeof(resp));
        if (err)
                return err;

        err = mana_verify_resp_hdr(&resp.hdr, MANA_QUERY_VPORT_CONFIG,
                                   sizeof(resp));
        if (err)
                return err;

        if (resp.hdr.status)
                return -EPROTO;

        *max_sq = resp.max_num_sq;
        *max_rq = resp.max_num_rq;
        *num_indir_entry = resp.num_indirection_ent;

        apc->port_handle = resp.vport;
        ether_addr_copy(apc->mac_addr, resp.mac_addr);

        return 0;
}

void mana_uncfg_vport(struct mana_port_context *apc)
{
        mutex_lock(&apc->vport_mutex);
        apc->vport_use_count--;
        WARN_ON(apc->vport_use_count < 0);
        mutex_unlock(&apc->vport_mutex);
}
EXPORT_SYMBOL_NS(mana_uncfg_vport, NET_MANA);

int mana_cfg_vport(struct mana_port_context *apc, u32 protection_dom_id,
                   u32 doorbell_pg_id)
{
        struct mana_config_vport_resp resp = {};
        struct mana_config_vport_req req = {};
        int err;

        /* This function is used to program the Ethernet port in the hardware
         * table. It can be called from the Ethernet driver or the RDMA driver.
         *
         * For Ethernet usage, the hardware supports only one active user on a
         * physical port. The driver checks on the port usage before programming
         * the hardware when creating the RAW QP (RDMA driver) or exposing the
         * device to kernel NET layer (Ethernet driver).
         *
         * Because the RDMA driver doesn't know in advance which QP type the
         * user will create, it exposes the device with all its ports. The user
         * may not be able to create RAW QP on a port if this port is already
         * in used by the Ethernet driver from the kernel.
         *
         * This physical port limitation only applies to the RAW QP. For RC QP,
         * the hardware doesn't have this limitation. The user can create RC
         * QPs on a physical port up to the hardware limits independent of the
         * Ethernet usage on the same port.
         */
        mutex_lock(&apc->vport_mutex);
        if (apc->vport_use_count > 0) {
                mutex_unlock(&apc->vport_mutex);
                return -EBUSY;
        }
        apc->vport_use_count++;
        mutex_unlock(&apc->vport_mutex);

        mana_gd_init_req_hdr(&req.hdr, MANA_CONFIG_VPORT_TX,
                             sizeof(req), sizeof(resp));
        req.vport = apc->port_handle;
        req.pdid = protection_dom_id;
        req.doorbell_pageid = doorbell_pg_id;

        err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
                                sizeof(resp));
        if (err) {
                netdev_err(apc->ndev, "Failed to configure vPort: %d\n", err);
                goto out;
        }

        err = mana_verify_resp_hdr(&resp.hdr, MANA_CONFIG_VPORT_TX,
                                   sizeof(resp));
        if (err || resp.hdr.status) {
                netdev_err(apc->ndev, "Failed to configure vPort: %d, 0x%x\n",
                           err, resp.hdr.status);
                if (!err)
                        err = -EPROTO;

                goto out;
        }

        apc->tx_shortform_allowed = resp.short_form_allowed;
        apc->tx_vp_offset = resp.tx_vport_offset;

        netdev_info(apc->ndev, "Configured vPort %llu PD %u DB %u\n",
                    apc->port_handle, protection_dom_id, doorbell_pg_id);
out:
        if (err)
                mana_uncfg_vport(apc);

        return err;
}
EXPORT_SYMBOL_NS(mana_cfg_vport, NET_MANA);

static int mana_cfg_vport_steering(struct mana_port_context *apc,
                                   enum TRI_STATE rx,
                                   bool update_default_rxobj, bool update_key,
                                   bool update_tab)
{
        u16 num_entries = MANA_INDIRECT_TABLE_SIZE;
        struct mana_cfg_rx_steer_req_v2 *req;
        struct mana_cfg_rx_steer_resp resp = {};
        struct net_device *ndev = apc->ndev;
        mana_handle_t *req_indir_tab;
        u32 req_buf_size;
        int err;

        req_buf_size = sizeof(*req) + sizeof(mana_handle_t) * num_entries;
        req = kzalloc(req_buf_size, GFP_KERNEL);
        if (!req)
                return -ENOMEM;

        mana_gd_init_req_hdr(&req->hdr, MANA_CONFIG_VPORT_RX, req_buf_size,
                             sizeof(resp));

        req->hdr.req.msg_version = GDMA_MESSAGE_V2;

        req->vport = apc->port_handle;
        req->num_indir_entries = num_entries;
        req->indir_tab_offset = sizeof(*req);
        req->rx_enable = rx;
        req->rss_enable = apc->rss_state;
        req->update_default_rxobj = update_default_rxobj;
        req->update_hashkey = update_key;
        req->update_indir_tab = update_tab;
        req->default_rxobj = apc->default_rxobj;
        req->cqe_coalescing_enable = 0;

        if (update_key)
                memcpy(&req->hashkey, apc->hashkey, MANA_HASH_KEY_SIZE);

        if (update_tab) {
                req_indir_tab = (mana_handle_t *)(req + 1);
                memcpy(req_indir_tab, apc->rxobj_table,
                       req->num_indir_entries * sizeof(mana_handle_t));
        }

        err = mana_send_request(apc->ac, req, req_buf_size, &resp,
                                sizeof(resp));
        if (err) {
                netdev_err(ndev, "Failed to configure vPort RX: %d\n", err);
                goto out;
        }

        err = mana_verify_resp_hdr(&resp.hdr, MANA_CONFIG_VPORT_RX,
                                   sizeof(resp));
        if (err) {
                netdev_err(ndev, "vPort RX configuration failed: %d\n", err);
                goto out;
        }

        if (resp.hdr.status) {
                netdev_err(ndev, "vPort RX configuration failed: 0x%x\n",
                           resp.hdr.status);
                err = -EPROTO;
        }

        netdev_info(ndev, "Configured steering vPort %llu entries %u\n",
                    apc->port_handle, num_entries);
out:
        kfree(req);
        return err;
}

int mana_create_wq_obj(struct mana_port_context *apc,
                       mana_handle_t vport,
                       u32 wq_type, struct mana_obj_spec *wq_spec,
                       struct mana_obj_spec *cq_spec,
                       mana_handle_t *wq_obj)
{
        struct mana_create_wqobj_resp resp = {};
        struct mana_create_wqobj_req req = {};
        struct net_device *ndev = apc->ndev;
        int err;

        mana_gd_init_req_hdr(&req.hdr, MANA_CREATE_WQ_OBJ,
                             sizeof(req), sizeof(resp));
        req.vport = vport;
        req.wq_type = wq_type;
        req.wq_gdma_region = wq_spec->gdma_region;
        req.cq_gdma_region = cq_spec->gdma_region;
        req.wq_size = wq_spec->queue_size;
        req.cq_size = cq_spec->queue_size;
        req.cq_moderation_ctx_id = cq_spec->modr_ctx_id;
        req.cq_parent_qid = cq_spec->attached_eq;

        err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
                                sizeof(resp));
        if (err) {
                netdev_err(ndev, "Failed to create WQ object: %d\n", err);
                goto out;
        }

        err = mana_verify_resp_hdr(&resp.hdr, MANA_CREATE_WQ_OBJ,
                                   sizeof(resp));
        if (err || resp.hdr.status) {
                netdev_err(ndev, "Failed to create WQ object: %d, 0x%x\n", err,
                           resp.hdr.status);
                if (!err)
                        err = -EPROTO;
                goto out;
        }

        if (resp.wq_obj == INVALID_MANA_HANDLE) {
                netdev_err(ndev, "Got an invalid WQ object handle\n");
                err = -EPROTO;
                goto out;
        }

        *wq_obj = resp.wq_obj;
        wq_spec->queue_index = resp.wq_id;
        cq_spec->queue_index = resp.cq_id;

        return 0;
out:
        return err;
}
EXPORT_SYMBOL_NS(mana_create_wq_obj, NET_MANA);

void mana_destroy_wq_obj(struct mana_port_context *apc, u32 wq_type,
                         mana_handle_t wq_obj)
{
        struct mana_destroy_wqobj_resp resp = {};
        struct mana_destroy_wqobj_req req = {};
        struct net_device *ndev = apc->ndev;
        int err;

        mana_gd_init_req_hdr(&req.hdr, MANA_DESTROY_WQ_OBJ,
                             sizeof(req), sizeof(resp));
        req.wq_type = wq_type;
        req.wq_obj_handle = wq_obj;

        err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
                                sizeof(resp));
        if (err) {
                netdev_err(ndev, "Failed to destroy WQ object: %d\n", err);
                return;
        }

        err = mana_verify_resp_hdr(&resp.hdr, MANA_DESTROY_WQ_OBJ,
                                   sizeof(resp));
        if (err || resp.hdr.status)
                netdev_err(ndev, "Failed to destroy WQ object: %d, 0x%x\n", err,
                           resp.hdr.status);
}
EXPORT_SYMBOL_NS(mana_destroy_wq_obj, NET_MANA);

static void mana_destroy_eq(struct mana_context *ac)
{
        struct gdma_context *gc = ac->gdma_dev->gdma_context;
        struct gdma_queue *eq;
        int i;

        if (!ac->eqs)
                return;

        for (i = 0; i < gc->max_num_queues; i++) {
                eq = ac->eqs[i].eq;
                if (!eq)
                        continue;

                mana_gd_destroy_queue(gc, eq);
        }

        kfree(ac->eqs);
        ac->eqs = NULL;
}

static int mana_create_eq(struct mana_context *ac)
{
        struct gdma_dev *gd = ac->gdma_dev;
        struct gdma_context *gc = gd->gdma_context;
        struct gdma_queue_spec spec = {};
        int err;
        int i;

        ac->eqs = kcalloc(gc->max_num_queues, sizeof(struct mana_eq),
                          GFP_KERNEL);
        if (!ac->eqs)
                return -ENOMEM;

        spec.type = GDMA_EQ;
        spec.monitor_avl_buf = false;
        spec.queue_size = EQ_SIZE;
        spec.eq.callback = NULL;
        spec.eq.context = ac->eqs;
        spec.eq.log2_throttle_limit = LOG2_EQ_THROTTLE;

        for (i = 0; i < gc->max_num_queues; i++) {
                err = mana_gd_create_mana_eq(gd, &spec, &ac->eqs[i].eq);
                if (err)
                        goto out;
        }

        return 0;
out:
        mana_destroy_eq(ac);
        return err;
}

static int mana_fence_rq(struct mana_port_context *apc, struct mana_rxq *rxq)
{
        struct mana_fence_rq_resp resp = {};
        struct mana_fence_rq_req req = {};
        int err;

        init_completion(&rxq->fence_event);

        mana_gd_init_req_hdr(&req.hdr, MANA_FENCE_RQ,
                             sizeof(req), sizeof(resp));
        req.wq_obj_handle =  rxq->rxobj;

        err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
                                sizeof(resp));
        if (err) {
                netdev_err(apc->ndev, "Failed to fence RQ %u: %d\n",
                           rxq->rxq_idx, err);
                return err;
        }

        err = mana_verify_resp_hdr(&resp.hdr, MANA_FENCE_RQ, sizeof(resp));
        if (err || resp.hdr.status) {
                netdev_err(apc->ndev, "Failed to fence RQ %u: %d, 0x%x\n",
                           rxq->rxq_idx, err, resp.hdr.status);
                if (!err)
                        err = -EPROTO;

                return err;
        }

        if (wait_for_completion_timeout(&rxq->fence_event, 10 * HZ) == 0) {
                netdev_err(apc->ndev, "Failed to fence RQ %u: timed out\n",
                           rxq->rxq_idx);
                return -ETIMEDOUT;
        }

        return 0;
}

static void mana_fence_rqs(struct mana_port_context *apc)
{
        unsigned int rxq_idx;
        struct mana_rxq *rxq;
        int err;

        for (rxq_idx = 0; rxq_idx < apc->num_queues; rxq_idx++) {
                rxq = apc->rxqs[rxq_idx];
                err = mana_fence_rq(apc, rxq);

                /* In case of any error, use sleep instead. */
                if (err)
                        msleep(100);
        }
}

static int mana_move_wq_tail(struct gdma_queue *wq, u32 num_units)
{
        u32 used_space_old;
        u32 used_space_new;

        used_space_old = wq->head - wq->tail;
        used_space_new = wq->head - (wq->tail + num_units);

        if (WARN_ON_ONCE(used_space_new > used_space_old))
                return -ERANGE;

        wq->tail += num_units;
        return 0;
}

static void mana_unmap_skb(struct sk_buff *skb, struct mana_port_context *apc)
{
        struct mana_skb_head *ash = (struct mana_skb_head *)skb->head;
        struct gdma_context *gc = apc->ac->gdma_dev->gdma_context;
        struct device *dev = gc->dev;
        int i;

        dma_unmap_single(dev, ash->dma_handle[0], ash->size[0], DMA_TO_DEVICE);

        for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
                dma_unmap_page(dev, ash->dma_handle[i], ash->size[i],
                               DMA_TO_DEVICE);
}

static void mana_poll_tx_cq(struct mana_cq *cq)
{
        struct gdma_comp *completions = cq->gdma_comp_buf;
        struct gdma_posted_wqe_info *wqe_info;
        unsigned int pkt_transmitted = 0;
        unsigned int wqe_unit_cnt = 0;
        struct mana_txq *txq = cq->txq;
        struct mana_port_context *apc;
        struct netdev_queue *net_txq;
        struct gdma_queue *gdma_wq;
        unsigned int avail_space;
        struct net_device *ndev;
        struct sk_buff *skb;
        bool txq_stopped;
        int comp_read;
        int i;

        ndev = txq->ndev;
        apc = netdev_priv(ndev);

        comp_read = mana_gd_poll_cq(cq->gdma_cq, completions,
                                    CQE_POLLING_BUFFER);

        if (comp_read < 1)
                return;

        for (i = 0; i < comp_read; i++) {
                struct mana_tx_comp_oob *cqe_oob;

                if (WARN_ON_ONCE(!completions[i].is_sq))
                        return;

                cqe_oob = (struct mana_tx_comp_oob *)completions[i].cqe_data;
                if (WARN_ON_ONCE(cqe_oob->cqe_hdr.client_type !=
                                 MANA_CQE_COMPLETION))
                        return;

                switch (cqe_oob->cqe_hdr.cqe_type) {
                case CQE_TX_OKAY:
                        break;

                case CQE_TX_SA_DROP:
                case CQE_TX_MTU_DROP:
                case CQE_TX_INVALID_OOB:
                case CQE_TX_INVALID_ETH_TYPE:
                case CQE_TX_HDR_PROCESSING_ERROR:
                case CQE_TX_VF_DISABLED:
                case CQE_TX_VPORT_IDX_OUT_OF_RANGE:
                case CQE_TX_VPORT_DISABLED:
                case CQE_TX_VLAN_TAGGING_VIOLATION:
                        if (net_ratelimit())
                                netdev_err(ndev, "TX: CQE error %d\n",
                                           cqe_oob->cqe_hdr.cqe_type);

                        apc->eth_stats.tx_cqe_err++;
                        break;

                default:
                        /* If the CQE type is unknown, log an error,
                         * and still free the SKB, update tail, etc.
                         */
                        if (net_ratelimit())
                                netdev_err(ndev, "TX: unknown CQE type %d\n",
                                           cqe_oob->cqe_hdr.cqe_type);

                        apc->eth_stats.tx_cqe_unknown_type++;
                        break;
                }

                if (WARN_ON_ONCE(txq->gdma_txq_id != completions[i].wq_num))
                        return;

                skb = skb_dequeue(&txq->pending_skbs);
                if (WARN_ON_ONCE(!skb))
                        return;

                wqe_info = (struct gdma_posted_wqe_info *)skb->cb;
                wqe_unit_cnt += wqe_info->wqe_size_in_bu;

                mana_unmap_skb(skb, apc);

                napi_consume_skb(skb, cq->budget);

                pkt_transmitted++;
        }

        if (WARN_ON_ONCE(wqe_unit_cnt == 0))
                return;

        mana_move_wq_tail(txq->gdma_sq, wqe_unit_cnt);

        gdma_wq = txq->gdma_sq;
        avail_space = mana_gd_wq_avail_space(gdma_wq);

        /* Ensure tail updated before checking q stop */
        smp_mb();

        net_txq = txq->net_txq;
        txq_stopped = netif_tx_queue_stopped(net_txq);

        /* Ensure checking txq_stopped before apc->port_is_up. */
        smp_rmb();

        if (txq_stopped && apc->port_is_up && avail_space >= MAX_TX_WQE_SIZE) {
                netif_tx_wake_queue(net_txq);
                apc->eth_stats.wake_queue++;
        }

        if (atomic_sub_return(pkt_transmitted, &txq->pending_sends) < 0)
                WARN_ON_ONCE(1);

        cq->work_done = pkt_transmitted;
}

static void mana_post_pkt_rxq(struct mana_rxq *rxq)
{
        struct mana_recv_buf_oob *recv_buf_oob;
        u32 curr_index;
        int err;

        curr_index = rxq->buf_index++;
        if (rxq->buf_index == rxq->num_rx_buf)
                rxq->buf_index = 0;

        recv_buf_oob = &rxq->rx_oobs[curr_index];

        err = mana_gd_post_work_request(rxq->gdma_rq, &recv_buf_oob->wqe_req,
                                        &recv_buf_oob->wqe_inf);
        if (WARN_ON_ONCE(err))
                return;

        WARN_ON_ONCE(recv_buf_oob->wqe_inf.wqe_size_in_bu != 1);
}

static struct sk_buff *mana_build_skb(struct mana_rxq *rxq, void *buf_va,
                                      uint pkt_len, struct xdp_buff *xdp)
{
        struct sk_buff *skb = napi_build_skb(buf_va, rxq->alloc_size);

        if (!skb)
                return NULL;

        if (xdp->data_hard_start) {
                skb_reserve(skb, xdp->data - xdp->data_hard_start);
                skb_put(skb, xdp->data_end - xdp->data);
                return skb;
        }

        skb_reserve(skb, rxq->headroom);
        skb_put(skb, pkt_len);

        return skb;
}

static void mana_rx_skb(void *buf_va, bool from_pool,
                        struct mana_rxcomp_oob *cqe, struct mana_rxq *rxq)
{
        struct mana_stats_rx *rx_stats = &rxq->stats;
        struct net_device *ndev = rxq->ndev;
        uint pkt_len = cqe->ppi[0].pkt_len;
        u16 rxq_idx = rxq->rxq_idx;
        struct napi_struct *napi;
        struct xdp_buff xdp = {};
        struct sk_buff *skb;
        u32 hash_value;
        u32 act;

        rxq->rx_cq.work_done++;
        napi = &rxq->rx_cq.napi;

        if (!buf_va) {
                ++ndev->stats.rx_dropped;
                return;
        }

        act = mana_run_xdp(ndev, rxq, &xdp, buf_va, pkt_len);

        if (act == XDP_REDIRECT && !rxq->xdp_rc)
                return;

        if (act != XDP_PASS && act != XDP_TX)
                goto drop_xdp;

        skb = mana_build_skb(rxq, buf_va, pkt_len, &xdp);

        if (!skb)
                goto drop;

        if (from_pool)
                skb_mark_for_recycle(skb);

        skb->dev = napi->dev;

        skb->protocol = eth_type_trans(skb, ndev);
        skb_checksum_none_assert(skb);
        skb_record_rx_queue(skb, rxq_idx);

        if ((ndev->features & NETIF_F_RXCSUM) && cqe->rx_iphdr_csum_succeed) {
                if (cqe->rx_tcp_csum_succeed || cqe->rx_udp_csum_succeed)
                        skb->ip_summed = CHECKSUM_UNNECESSARY;
        }

        if (cqe->rx_hashtype != 0 && (ndev->features & NETIF_F_RXHASH)) {
                hash_value = cqe->ppi[0].pkt_hash;

                if (cqe->rx_hashtype & MANA_HASH_L4)
                        skb_set_hash(skb, hash_value, PKT_HASH_TYPE_L4);
                else
                        skb_set_hash(skb, hash_value, PKT_HASH_TYPE_L3);
        }

        if (cqe->rx_vlantag_present) {
                u16 vlan_tci = cqe->rx_vlan_id;

                __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci);
        }

        u64_stats_update_begin(&rx_stats->syncp);
        rx_stats->packets++;
        rx_stats->bytes += pkt_len;

        if (act == XDP_TX)
                rx_stats->xdp_tx++;
        u64_stats_update_end(&rx_stats->syncp);

        if (act == XDP_TX) {
                skb_set_queue_mapping(skb, rxq_idx);
                mana_xdp_tx(skb, ndev);
                return;
        }

        napi_gro_receive(napi, skb);

        return;

drop_xdp:
        u64_stats_update_begin(&rx_stats->syncp);
        rx_stats->xdp_drop++;
        u64_stats_update_end(&rx_stats->syncp);

drop:
        if (from_pool) {
                page_pool_recycle_direct(rxq->page_pool,
                                         virt_to_head_page(buf_va));
        } else {
                WARN_ON_ONCE(rxq->xdp_save_va);
                /* Save for reuse */
                rxq->xdp_save_va = buf_va;
        }

        ++ndev->stats.rx_dropped;

        return;
}

static void *mana_get_rxfrag(struct mana_rxq *rxq, struct device *dev,
                             dma_addr_t *da, bool *from_pool, bool is_napi)
{
        struct page *page;
        void *va;

        *from_pool = false;

        /* Reuse XDP dropped page if available */
        if (rxq->xdp_save_va) {
                va = rxq->xdp_save_va;
                rxq->xdp_save_va = NULL;
        } else if (rxq->alloc_size > PAGE_SIZE) {
                if (is_napi)
                        va = napi_alloc_frag(rxq->alloc_size);
                else
                        va = netdev_alloc_frag(rxq->alloc_size);

                if (!va)
                        return NULL;

                page = virt_to_head_page(va);
                /* Check if the frag falls back to single page */
                if (compound_order(page) < get_order(rxq->alloc_size)) {
                        put_page(page);
                        return NULL;
                }
        } else {
                page = page_pool_dev_alloc_pages(rxq->page_pool);
                if (!page)
                        return NULL;

                *from_pool = true;
                va = page_to_virt(page);
        }

        *da = dma_map_single(dev, va + rxq->headroom, rxq->datasize,
                             DMA_FROM_DEVICE);
        if (dma_mapping_error(dev, *da)) {
                if (*from_pool)
                        page_pool_put_full_page(rxq->page_pool, page, false);
                else
                        put_page(virt_to_head_page(va));

                return NULL;
        }

        return va;
}

/* Allocate frag for rx buffer, and save the old buf */
static void mana_refill_rx_oob(struct device *dev, struct mana_rxq *rxq,
                               struct mana_recv_buf_oob *rxoob, void **old_buf,
                               bool *old_fp)
{
        bool from_pool;
        dma_addr_t da;
        void *va;

        va = mana_get_rxfrag(rxq, dev, &da, &from_pool, true);
        if (!va)
                return;

        dma_unmap_single(dev, rxoob->sgl[0].address, rxq->datasize,
                         DMA_FROM_DEVICE);
        *old_buf = rxoob->buf_va;
        *old_fp = rxoob->from_pool;

        rxoob->buf_va = va;
        rxoob->sgl[0].address = da;
        rxoob->from_pool = from_pool;
}

static void mana_process_rx_cqe(struct mana_rxq *rxq, struct mana_cq *cq,
                                struct gdma_comp *cqe)
{
        struct mana_rxcomp_oob *oob = (struct mana_rxcomp_oob *)cqe->cqe_data;
        struct gdma_context *gc = rxq->gdma_rq->gdma_dev->gdma_context;
        struct net_device *ndev = rxq->ndev;
        struct mana_recv_buf_oob *rxbuf_oob;
        struct mana_port_context *apc;
        struct device *dev = gc->dev;
        void *old_buf = NULL;
        u32 curr, pktlen;
        bool old_fp;

        apc = netdev_priv(ndev);

        switch (oob->cqe_hdr.cqe_type) {
        case CQE_RX_OKAY:
                break;

        case CQE_RX_TRUNCATED:
                ++ndev->stats.rx_dropped;
                rxbuf_oob = &rxq->rx_oobs[rxq->buf_index];
                netdev_warn_once(ndev, "Dropped a truncated packet\n");
                goto drop;

        case CQE_RX_COALESCED_4:
                netdev_err(ndev, "RX coalescing is unsupported\n");
                apc->eth_stats.rx_coalesced_err++;
                return;

        case CQE_RX_OBJECT_FENCE:
                complete(&rxq->fence_event);
                return;

        default:
                netdev_err(ndev, "Unknown RX CQE type = %d\n",
                           oob->cqe_hdr.cqe_type);
                apc->eth_stats.rx_cqe_unknown_type++;
                return;
        }

        pktlen = oob->ppi[0].pkt_len;

        if (pktlen == 0) {
                /* data packets should never have packetlength of zero */
                netdev_err(ndev, "RX pkt len=0, rq=%u, cq=%u, rxobj=0x%llx\n",
                           rxq->gdma_id, cq->gdma_id, rxq->rxobj);
                return;
        }

        curr = rxq->buf_index;
        rxbuf_oob = &rxq->rx_oobs[curr];
        WARN_ON_ONCE(rxbuf_oob->wqe_inf.wqe_size_in_bu != 1);

        mana_refill_rx_oob(dev, rxq, rxbuf_oob, &old_buf, &old_fp);

        /* Unsuccessful refill will have old_buf == NULL.
         * In this case, mana_rx_skb() will drop the packet.
         */
        mana_rx_skb(old_buf, old_fp, oob, rxq);

drop:
        mana_move_wq_tail(rxq->gdma_rq, rxbuf_oob->wqe_inf.wqe_size_in_bu);

        mana_post_pkt_rxq(rxq);
}

static void mana_poll_rx_cq(struct mana_cq *cq)
{
        struct gdma_comp *comp = cq->gdma_comp_buf;
        struct mana_rxq *rxq = cq->rxq;
        int comp_read, i;

        comp_read = mana_gd_poll_cq(cq->gdma_cq, comp, CQE_POLLING_BUFFER);
        WARN_ON_ONCE(comp_read > CQE_POLLING_BUFFER);

        rxq->xdp_flush = false;

        for (i = 0; i < comp_read; i++) {
                if (WARN_ON_ONCE(comp[i].is_sq))
                        return;

                /* verify recv cqe references the right rxq */
                if (WARN_ON_ONCE(comp[i].wq_num != cq->rxq->gdma_id))
                        return;

                mana_process_rx_cqe(rxq, cq, &comp[i]);
        }

        if (comp_read > 0) {
                struct gdma_context *gc = rxq->gdma_rq->gdma_dev->gdma_context;

                mana_gd_wq_ring_doorbell(gc, rxq->gdma_rq);
        }

        if (rxq->xdp_flush)
                xdp_do_flush();
}

static int mana_cq_handler(void *context, struct gdma_queue *gdma_queue)
{
        struct mana_cq *cq = context;
        u8 arm_bit;
        int w;

        WARN_ON_ONCE(cq->gdma_cq != gdma_queue);

        if (cq->type == MANA_CQ_TYPE_RX)
                mana_poll_rx_cq(cq);
        else
                mana_poll_tx_cq(cq);

        w = cq->work_done;

        if (w < cq->budget &&
            napi_complete_done(&cq->napi, w)) {
                arm_bit = SET_ARM_BIT;
        } else {
                arm_bit = 0;
        }

        mana_gd_ring_cq(gdma_queue, arm_bit);

        return w;
}

static int mana_poll(struct napi_struct *napi, int budget)
{
        struct mana_cq *cq = container_of(napi, struct mana_cq, napi);
        int w;

        cq->work_done = 0;
        cq->budget = budget;

        w = mana_cq_handler(cq, cq->gdma_cq);

        return min(w, budget);
}

static void mana_schedule_napi(void *context, struct gdma_queue *gdma_queue)
{
        struct mana_cq *cq = context;

        napi_schedule_irqoff(&cq->napi);
}

static void mana_deinit_cq(struct mana_port_context *apc, struct mana_cq *cq)
{
        struct gdma_dev *gd = apc->ac->gdma_dev;

        if (!cq->gdma_cq)
                return;

        mana_gd_destroy_queue(gd->gdma_context, cq->gdma_cq);
}

static void mana_deinit_txq(struct mana_port_context *apc, struct mana_txq *txq)
{
        struct gdma_dev *gd = apc->ac->gdma_dev;

        if (!txq->gdma_sq)
                return;

        mana_gd_destroy_queue(gd->gdma_context, txq->gdma_sq);
}

static void mana_destroy_txq(struct mana_port_context *apc)
{
        struct napi_struct *napi;
        int i;

        if (!apc->tx_qp)
                return;

        for (i = 0; i < apc->num_queues; i++) {
                napi = &apc->tx_qp[i].tx_cq.napi;
                napi_synchronize(napi);
                napi_disable(napi);
                netif_napi_del(napi);

                mana_destroy_wq_obj(apc, GDMA_SQ, apc->tx_qp[i].tx_object);

                mana_deinit_cq(apc, &apc->tx_qp[i].tx_cq);

                mana_deinit_txq(apc, &apc->tx_qp[i].txq);
        }

        kfree(apc->tx_qp);
        apc->tx_qp = NULL;
}

static int mana_create_txq(struct mana_port_context *apc,
                           struct net_device *net)
{
        struct mana_context *ac = apc->ac;
        struct gdma_dev *gd = ac->gdma_dev;
        struct mana_obj_spec wq_spec;
        struct mana_obj_spec cq_spec;
        struct gdma_queue_spec spec;
        struct gdma_context *gc;
        struct mana_txq *txq;
        struct mana_cq *cq;
        u32 txq_size;
        u32 cq_size;
        int err;
        int i;

        apc->tx_qp = kcalloc(apc->num_queues, sizeof(struct mana_tx_qp),
                             GFP_KERNEL);
        if (!apc->tx_qp)
                return -ENOMEM;

        /*  The minimum size of the WQE is 32 bytes, hence
         *  MAX_SEND_BUFFERS_PER_QUEUE represents the maximum number of WQEs
         *  the SQ can store. This value is then used to size other queues
         *  to prevent overflow.
         */
        txq_size = MAX_SEND_BUFFERS_PER_QUEUE * 32;
        BUILD_BUG_ON(!PAGE_ALIGNED(txq_size));

        cq_size = MAX_SEND_BUFFERS_PER_QUEUE * COMP_ENTRY_SIZE;
        cq_size = PAGE_ALIGN(cq_size);

        gc = gd->gdma_context;

        for (i = 0; i < apc->num_queues; i++) {
                apc->tx_qp[i].tx_object = INVALID_MANA_HANDLE;

                /* Create SQ */
                txq = &apc->tx_qp[i].txq;

                u64_stats_init(&txq->stats.syncp);
                txq->ndev = net;
                txq->net_txq = netdev_get_tx_queue(net, i);
                txq->vp_offset = apc->tx_vp_offset;
                skb_queue_head_init(&txq->pending_skbs);

                memset(&spec, 0, sizeof(spec));
                spec.type = GDMA_SQ;
                spec.monitor_avl_buf = true;
                spec.queue_size = txq_size;
                err = mana_gd_create_mana_wq_cq(gd, &spec, &txq->gdma_sq);
                if (err)
                        goto out;

                /* Create SQ's CQ */
                cq = &apc->tx_qp[i].tx_cq;
                cq->type = MANA_CQ_TYPE_TX;

                cq->txq = txq;

                memset(&spec, 0, sizeof(spec));
                spec.type = GDMA_CQ;
                spec.monitor_avl_buf = false;
                spec.queue_size = cq_size;
                spec.cq.callback = mana_schedule_napi;
                spec.cq.parent_eq = ac->eqs[i].eq;
                spec.cq.context = cq;
                err = mana_gd_create_mana_wq_cq(gd, &spec, &cq->gdma_cq);
                if (err)
                        goto out;

                memset(&wq_spec, 0, sizeof(wq_spec));
                memset(&cq_spec, 0, sizeof(cq_spec));

                wq_spec.gdma_region = txq->gdma_sq->mem_info.dma_region_handle;
                wq_spec.queue_size = txq->gdma_sq->queue_size;

                cq_spec.gdma_region = cq->gdma_cq->mem_info.dma_region_handle;
                cq_spec.queue_size = cq->gdma_cq->queue_size;
                cq_spec.modr_ctx_id = 0;
                cq_spec.attached_eq = cq->gdma_cq->cq.parent->id;

                err = mana_create_wq_obj(apc, apc->port_handle, GDMA_SQ,
                                         &wq_spec, &cq_spec,
                                         &apc->tx_qp[i].tx_object);

                if (err)
                        goto out;

                txq->gdma_sq->id = wq_spec.queue_index;
                cq->gdma_cq->id = cq_spec.queue_index;

                txq->gdma_sq->mem_info.dma_region_handle =
                        GDMA_INVALID_DMA_REGION;
                cq->gdma_cq->mem_info.dma_region_handle =
                        GDMA_INVALID_DMA_REGION;

                txq->gdma_txq_id = txq->gdma_sq->id;

                cq->gdma_id = cq->gdma_cq->id;

                if (WARN_ON(cq->gdma_id >= gc->max_num_cqs)) {
                        err = -EINVAL;
                        goto out;
                }

                gc->cq_table[cq->gdma_id] = cq->gdma_cq;

                netif_napi_add_tx(net, &cq->napi, mana_poll);
                napi_enable(&cq->napi);

                mana_gd_ring_cq(cq->gdma_cq, SET_ARM_BIT);
        }

        return 0;
out:
        mana_destroy_txq(apc);
        return err;
}

static void mana_destroy_rxq(struct mana_port_context *apc,
                             struct mana_rxq *rxq, bool validate_state)

{
        struct gdma_context *gc = apc->ac->gdma_dev->gdma_context;
        struct mana_recv_buf_oob *rx_oob;
        struct device *dev = gc->dev;
        struct napi_struct *napi;
        struct page *page;
        int i;

        if (!rxq)
                return;

        napi = &rxq->rx_cq.napi;

        if (validate_state)
                napi_synchronize(napi);

        napi_disable(napi);

        xdp_rxq_info_unreg(&rxq->xdp_rxq);

        netif_napi_del(napi);

        mana_destroy_wq_obj(apc, GDMA_RQ, rxq->rxobj);

        mana_deinit_cq(apc, &rxq->rx_cq);

        if (rxq->xdp_save_va)
                put_page(virt_to_head_page(rxq->xdp_save_va));

        for (i = 0; i < rxq->num_rx_buf; i++) {
                rx_oob = &rxq->rx_oobs[i];

                if (!rx_oob->buf_va)
                        continue;

                dma_unmap_single(dev, rx_oob->sgl[0].address,
                                 rx_oob->sgl[0].size, DMA_FROM_DEVICE);

                page = virt_to_head_page(rx_oob->buf_va);

                if (rx_oob->from_pool)
                        page_pool_put_full_page(rxq->page_pool, page, false);
                else
                        put_page(page);

                rx_oob->buf_va = NULL;
        }

        page_pool_destroy(rxq->page_pool);

        if (rxq->gdma_rq)
                mana_gd_destroy_queue(gc, rxq->gdma_rq);

        kfree(rxq);
}

static int mana_fill_rx_oob(struct mana_recv_buf_oob *rx_oob, u32 mem_key,
                            struct mana_rxq *rxq, struct device *dev)
{
        struct mana_port_context *mpc = netdev_priv(rxq->ndev);
        bool from_pool = false;
        dma_addr_t da;
        void *va;

        if (mpc->rxbufs_pre)
                va = mana_get_rxbuf_pre(rxq, &da);
        else
                va = mana_get_rxfrag(rxq, dev, &da, &from_pool, false);

        if (!va)
                return -ENOMEM;

        rx_oob->buf_va = va;
        rx_oob->from_pool = from_pool;

        rx_oob->sgl[0].address = da;
        rx_oob->sgl[0].size = rxq->datasize;
        rx_oob->sgl[0].mem_key = mem_key;

        return 0;
}

#define MANA_WQE_HEADER_SIZE 16
#define MANA_WQE_SGE_SIZE 16

static int mana_alloc_rx_wqe(struct mana_port_context *apc,
                             struct mana_rxq *rxq, u32 *rxq_size, u32 *cq_size)
{
        struct gdma_context *gc = apc->ac->gdma_dev->gdma_context;
        struct mana_recv_buf_oob *rx_oob;
        struct device *dev = gc->dev;
        u32 buf_idx;
        int ret;

        WARN_ON(rxq->datasize == 0);

        *rxq_size = 0;
        *cq_size = 0;

        for (buf_idx = 0; buf_idx < rxq->num_rx_buf; buf_idx++) {
                rx_oob = &rxq->rx_oobs[buf_idx];
                memset(rx_oob, 0, sizeof(*rx_oob));

                rx_oob->num_sge = 1;

                ret = mana_fill_rx_oob(rx_oob, apc->ac->gdma_dev->gpa_mkey, rxq,
                                       dev);
                if (ret)
                        return ret;

                rx_oob->wqe_req.sgl = rx_oob->sgl;
                rx_oob->wqe_req.num_sge = rx_oob->num_sge;
                rx_oob->wqe_req.inline_oob_size = 0;
                rx_oob->wqe_req.inline_oob_data = NULL;
                rx_oob->wqe_req.flags = 0;
                rx_oob->wqe_req.client_data_unit = 0;

                *rxq_size += ALIGN(MANA_WQE_HEADER_SIZE +
                                   MANA_WQE_SGE_SIZE * rx_oob->num_sge, 32);
                *cq_size += COMP_ENTRY_SIZE;
        }

        return 0;
}

static int mana_push_wqe(struct mana_rxq *rxq)
{
        struct mana_recv_buf_oob *rx_oob;
        u32 buf_idx;
        int err;

        for (buf_idx = 0; buf_idx < rxq->num_rx_buf; buf_idx++) {
                rx_oob = &rxq->rx_oobs[buf_idx];

                err = mana_gd_post_and_ring(rxq->gdma_rq, &rx_oob->wqe_req,
                                            &rx_oob->wqe_inf);
                if (err)
                        return -ENOSPC;
        }

        return 0;
}

static int mana_create_page_pool(struct mana_rxq *rxq, struct gdma_context *gc)
{
        struct page_pool_params pprm = {};
        int ret;

        pprm.pool_size = RX_BUFFERS_PER_QUEUE;
        pprm.nid = gc->numa_node;
        pprm.napi = &rxq->rx_cq.napi;

        rxq->page_pool = page_pool_create(&pprm);

        if (IS_ERR(rxq->page_pool)) {
                ret = PTR_ERR(rxq->page_pool);
                rxq->page_pool = NULL;
                return ret;
        }

        return 0;
}

static struct mana_rxq *mana_create_rxq(struct mana_port_context *apc,
                                        u32 rxq_idx, struct mana_eq *eq,
                                        struct net_device *ndev)
{
        struct gdma_dev *gd = apc->ac->gdma_dev;
        struct mana_obj_spec wq_spec;
        struct mana_obj_spec cq_spec;
        struct gdma_queue_spec spec;
        struct mana_cq *cq = NULL;
        struct gdma_context *gc;
        u32 cq_size, rq_size;
        struct mana_rxq *rxq;
        int err;

        gc = gd->gdma_context;

        rxq = kzalloc(struct_size(rxq, rx_oobs, RX_BUFFERS_PER_QUEUE),
                      GFP_KERNEL);
        if (!rxq)
                return NULL;

        rxq->ndev = ndev;
        rxq->num_rx_buf = RX_BUFFERS_PER_QUEUE;
        rxq->rxq_idx = rxq_idx;
        rxq->rxobj = INVALID_MANA_HANDLE;

        mana_get_rxbuf_cfg(ndev->mtu, &rxq->datasize, &rxq->alloc_size,
                           &rxq->headroom);

        /* Create page pool for RX queue */
        err = mana_create_page_pool(rxq, gc);
        if (err) {
                netdev_err(ndev, "Create page pool err:%d\n", err);
                goto out;
        }

        err = mana_alloc_rx_wqe(apc, rxq, &rq_size, &cq_size);
        if (err)
                goto out;

        rq_size = PAGE_ALIGN(rq_size);
        cq_size = PAGE_ALIGN(cq_size);

        /* Create RQ */
        memset(&spec, 0, sizeof(spec));
        spec.type = GDMA_RQ;
        spec.monitor_avl_buf = true;
        spec.queue_size = rq_size;
        err = mana_gd_create_mana_wq_cq(gd, &spec, &rxq->gdma_rq);
        if (err)
                goto out;

        /* Create RQ's CQ */
        cq = &rxq->rx_cq;
        cq->type = MANA_CQ_TYPE_RX;
        cq->rxq = rxq;

        memset(&spec, 0, sizeof(spec));
        spec.type = GDMA_CQ;
        spec.monitor_avl_buf = false;
        spec.queue_size = cq_size;
        spec.cq.callback = mana_schedule_napi;
        spec.cq.parent_eq = eq->eq;
        spec.cq.context = cq;
        err = mana_gd_create_mana_wq_cq(gd, &spec, &cq->gdma_cq);
        if (err)
                goto out;

        memset(&wq_spec, 0, sizeof(wq_spec));
        memset(&cq_spec, 0, sizeof(cq_spec));
        wq_spec.gdma_region = rxq->gdma_rq->mem_info.dma_region_handle;
        wq_spec.queue_size = rxq->gdma_rq->queue_size;

        cq_spec.gdma_region = cq->gdma_cq->mem_info.dma_region_handle;
        cq_spec.queue_size = cq->gdma_cq->queue_size;
        cq_spec.modr_ctx_id = 0;
        cq_spec.attached_eq = cq->gdma_cq->cq.parent->id;

        err = mana_create_wq_obj(apc, apc->port_handle, GDMA_RQ,
                                 &wq_spec, &cq_spec, &rxq->rxobj);
        if (err)
                goto out;

        rxq->gdma_rq->id = wq_spec.queue_index;
        cq->gdma_cq->id = cq_spec.queue_index;

        rxq->gdma_rq->mem_info.dma_region_handle = GDMA_INVALID_DMA_REGION;
        cq->gdma_cq->mem_info.dma_region_handle = GDMA_INVALID_DMA_REGION;

        rxq->gdma_id = rxq->gdma_rq->id;
        cq->gdma_id = cq->gdma_cq->id;

        err = mana_push_wqe(rxq);
        if (err)
                goto out;

        if (WARN_ON(cq->gdma_id >= gc->max_num_cqs)) {
                err = -EINVAL;
                goto out;
        }

        gc->cq_table[cq->gdma_id] = cq->gdma_cq;

        netif_napi_add_weight(ndev, &cq->napi, mana_poll, 1);

        WARN_ON(xdp_rxq_info_reg(&rxq->xdp_rxq, ndev, rxq_idx,
                                 cq->napi.napi_id));
        WARN_ON(xdp_rxq_info_reg_mem_model(&rxq->xdp_rxq, MEM_TYPE_PAGE_POOL,
                                           rxq->page_pool));

        napi_enable(&cq->napi);

        mana_gd_ring_cq(cq->gdma_cq, SET_ARM_BIT);
out:
        if (!err)
                return rxq;

        netdev_err(ndev, "Failed to create RXQ: err = %d\n", err);

        mana_destroy_rxq(apc, rxq, false);

        if (cq)
                mana_deinit_cq(apc, cq);

        return NULL;
}

static int mana_add_rx_queues(struct mana_port_context *apc,
                              struct net_device *ndev)
{
        struct mana_context *ac = apc->ac;
        struct mana_rxq *rxq;
        int err = 0;
        int i;

        for (i = 0; i < apc->num_queues; i++) {
                rxq = mana_create_rxq(apc, i, &ac->eqs[i], ndev);
                if (!rxq) {
                        err = -ENOMEM;
                        goto out;
                }

                u64_stats_init(&rxq->stats.syncp);

                apc->rxqs[i] = rxq;
        }

        apc->default_rxobj = apc->rxqs[0]->rxobj;
out:
        return err;
}

static void mana_destroy_vport(struct mana_port_context *apc)
{
        struct gdma_dev *gd = apc->ac->gdma_dev;
        struct mana_rxq *rxq;
        u32 rxq_idx;

        for (rxq_idx = 0; rxq_idx < apc->num_queues; rxq_idx++) {
                rxq = apc->rxqs[rxq_idx];
                if (!rxq)
                        continue;

                mana_destroy_rxq(apc, rxq, true);
                apc->rxqs[rxq_idx] = NULL;
        }

        mana_destroy_txq(apc);
        mana_uncfg_vport(apc);

        if (gd->gdma_context->is_pf)
                mana_pf_deregister_hw_vport(apc);
}

static int mana_create_vport(struct mana_port_context *apc,
                             struct net_device *net)
{
        struct gdma_dev *gd = apc->ac->gdma_dev;
        int err;

        apc->default_rxobj = INVALID_MANA_HANDLE;

        if (gd->gdma_context->is_pf) {
                err = mana_pf_register_hw_vport(apc);
                if (err)
                        return err;
        }

        err = mana_cfg_vport(apc, gd->pdid, gd->doorbell);
        if (err)
                return err;

        return mana_create_txq(apc, net);
}

static void mana_rss_table_init(struct mana_port_context *apc)
{
        int i;

        for (i = 0; i < MANA_INDIRECT_TABLE_SIZE; i++)
                apc->indir_table[i] =
                        ethtool_rxfh_indir_default(i, apc->num_queues);
}

int mana_config_rss(struct mana_port_context *apc, enum TRI_STATE rx,
                    bool update_hash, bool update_tab)
{
        u32 queue_idx;
        int err;
        int i;

        if (update_tab) {
                for (i = 0; i < MANA_INDIRECT_TABLE_SIZE; i++) {
                        queue_idx = apc->indir_table[i];
                        apc->rxobj_table[i] = apc->rxqs[queue_idx]->rxobj;
                }
        }

        err = mana_cfg_vport_steering(apc, rx, true, update_hash, update_tab);
        if (err)
                return err;

        mana_fence_rqs(apc);

        return 0;
}

void mana_query_gf_stats(struct mana_port_context *apc)
{
        struct mana_query_gf_stat_resp resp = {};
        struct mana_query_gf_stat_req req = {};
        struct net_device *ndev = apc->ndev;
        int err;

        mana_gd_init_req_hdr(&req.hdr, MANA_QUERY_GF_STAT,
                             sizeof(req), sizeof(resp));
        req.req_stats = STATISTICS_FLAGS_HC_TX_BYTES |
                        STATISTICS_FLAGS_HC_TX_UCAST_PACKETS |
                        STATISTICS_FLAGS_HC_TX_UCAST_BYTES |
                        STATISTICS_FLAGS_HC_TX_MCAST_PACKETS |
                        STATISTICS_FLAGS_HC_TX_MCAST_BYTES |
                        STATISTICS_FLAGS_HC_TX_BCAST_PACKETS |
                        STATISTICS_FLAGS_HC_TX_BCAST_BYTES;

        err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
                                sizeof(resp));
        if (err) {
                netdev_err(ndev, "Failed to query GF stats: %d\n", err);
                return;
        }
        err = mana_verify_resp_hdr(&resp.hdr, MANA_QUERY_GF_STAT,
                                   sizeof(resp));
        if (err || resp.hdr.status) {
                netdev_err(ndev, "Failed to query GF stats: %d, 0x%x\n", err,
                           resp.hdr.status);
                return;
        }

        apc->eth_stats.hc_tx_bytes = resp.hc_tx_bytes;
        apc->eth_stats.hc_tx_ucast_pkts = resp.hc_tx_ucast_pkts;
        apc->eth_stats.hc_tx_ucast_bytes = resp.hc_tx_ucast_bytes;
        apc->eth_stats.hc_tx_bcast_pkts = resp.hc_tx_bcast_pkts;
        apc->eth_stats.hc_tx_bcast_bytes = resp.hc_tx_bcast_bytes;
        apc->eth_stats.hc_tx_mcast_pkts = resp.hc_tx_mcast_pkts;
        apc->eth_stats.hc_tx_mcast_bytes = resp.hc_tx_mcast_bytes;
}

static int mana_init_port(struct net_device *ndev)
{
        struct mana_port_context *apc = netdev_priv(ndev);
        u32 max_txq, max_rxq, max_queues;
        int port_idx = apc->port_idx;
        u32 num_indirect_entries;
        int err;

        err = mana_init_port_context(apc);
        if (err)
                return err;

        err = mana_query_vport_cfg(apc, port_idx, &max_txq, &max_rxq,
                                   &num_indirect_entries);
        if (err) {
                netdev_err(ndev, "Failed to query info for vPort %d\n",
                           port_idx);
                goto reset_apc;
        }

        max_queues = min_t(u32, max_txq, max_rxq);
        if (apc->max_queues > max_queues)
                apc->max_queues = max_queues;

        if (apc->num_queues > apc->max_queues)
                apc->num_queues = apc->max_queues;

        eth_hw_addr_set(ndev, apc->mac_addr);

        return 0;

reset_apc:
        kfree(apc->rxqs);
        apc->rxqs = NULL;
        return err;
}

int mana_alloc_queues(struct net_device *ndev)
{
        struct mana_port_context *apc = netdev_priv(ndev);
        struct gdma_dev *gd = apc->ac->gdma_dev;
        int err;

        err = mana_create_vport(apc, ndev);
        if (err)
                return err;

        err = netif_set_real_num_tx_queues(ndev, apc->num_queues);
        if (err)
                goto destroy_vport;

        err = mana_add_rx_queues(apc, ndev);
        if (err)
                goto destroy_vport;

        apc->rss_state = apc->num_queues > 1 ? TRI_STATE_TRUE : TRI_STATE_FALSE;

        err = netif_set_real_num_rx_queues(ndev, apc->num_queues);
        if (err)
                goto destroy_vport;

        mana_rss_table_init(apc);

        err = mana_config_rss(apc, TRI_STATE_TRUE, true, true);
        if (err)
                goto destroy_vport;

        if (gd->gdma_context->is_pf) {
                err = mana_pf_register_filter(apc);
                if (err)
                        goto destroy_vport;
        }

        mana_chn_setxdp(apc, mana_xdp_get(apc));

        return 0;

destroy_vport:
        mana_destroy_vport(apc);
        return err;
}

int mana_attach(struct net_device *ndev)
{
        struct mana_port_context *apc = netdev_priv(ndev);
        int err;

        ASSERT_RTNL();

        err = mana_init_port(ndev);
        if (err)
                return err;

        if (apc->port_st_save) {
                err = mana_alloc_queues(ndev);
                if (err) {
                        mana_cleanup_port_context(apc);
                        return err;
                }
        }

        apc->port_is_up = apc->port_st_save;

        /* Ensure port state updated before txq state */
        smp_wmb();

        if (apc->port_is_up)
                netif_carrier_on(ndev);

        netif_device_attach(ndev);

        return 0;
}

static int mana_dealloc_queues(struct net_device *ndev)
{
        struct mana_port_context *apc = netdev_priv(ndev);
        unsigned long timeout = jiffies + 120 * HZ;
        struct gdma_dev *gd = apc->ac->gdma_dev;
        struct mana_txq *txq;
        struct sk_buff *skb;
        int i, err;
        u32 tsleep;

        if (apc->port_is_up)
                return -EINVAL;

        mana_chn_setxdp(apc, NULL);

        if (gd->gdma_context->is_pf)
                mana_pf_deregister_filter(apc);

        /* No packet can be transmitted now since apc->port_is_up is false.
         * There is still a tiny chance that mana_poll_tx_cq() can re-enable
         * a txq because it may not timely see apc->port_is_up being cleared
         * to false, but it doesn't matter since mana_start_xmit() drops any
         * new packets due to apc->port_is_up being false.
         *
         * Drain all the in-flight TX packets.
         * A timeout of 120 seconds for all the queues is used.
         * This will break the while loop when h/w is not responding.
         * This value of 120 has been decided here considering max
         * number of queues.
         */

        for (i = 0; i < apc->num_queues; i++) {
                txq = &apc->tx_qp[i].txq;
                tsleep = 1000;
                while (atomic_read(&txq->pending_sends) > 0 &&
                       time_before(jiffies, timeout)) {
                        usleep_range(tsleep, tsleep + 1000);
                        tsleep <<= 1;
                }
                if (atomic_read(&txq->pending_sends)) {
                        err = pcie_flr(to_pci_dev(gd->gdma_context->dev));
                        if (err) {
                                netdev_err(ndev, "flr failed %d with %d pkts pending in txq %u\n",
                                           err, atomic_read(&txq->pending_sends),
                                           txq->gdma_txq_id);
                        }
                        break;
                }
        }

        for (i = 0; i < apc->num_queues; i++) {
                txq = &apc->tx_qp[i].txq;
                while ((skb = skb_dequeue(&txq->pending_skbs))) {
                        mana_unmap_skb(skb, apc);
                        dev_kfree_skb_any(skb);
                }
                atomic_set(&txq->pending_sends, 0);
        }
        /* We're 100% sure the queues can no longer be woken up, because
         * we're sure now mana_poll_tx_cq() can't be running.
         */

        apc->rss_state = TRI_STATE_FALSE;
        err = mana_config_rss(apc, TRI_STATE_FALSE, false, false);
        if (err) {
                netdev_err(ndev, "Failed to disable vPort: %d\n", err);
                return err;
        }

        mana_destroy_vport(apc);

        return 0;
}

int mana_detach(struct net_device *ndev, bool from_close)
{
        struct mana_port_context *apc = netdev_priv(ndev);
        int err;

        ASSERT_RTNL();

        apc->port_st_save = apc->port_is_up;
        apc->port_is_up = false;

        /* Ensure port state updated before txq state */
        smp_wmb();

        netif_tx_disable(ndev);
        netif_carrier_off(ndev);

        if (apc->port_st_save) {
                err = mana_dealloc_queues(ndev);
                if (err)
                        return err;
        }

        if (!from_close) {
                netif_device_detach(ndev);
                mana_cleanup_port_context(apc);
        }

        return 0;
}

static int mana_probe_port(struct mana_context *ac, int port_idx,
                           struct net_device **ndev_storage)
{
        struct gdma_context *gc = ac->gdma_dev->gdma_context;
        struct mana_port_context *apc;
        struct net_device *ndev;
        int err;

        ndev = alloc_etherdev_mq(sizeof(struct mana_port_context),
                                 gc->max_num_queues);
        if (!ndev)
                return -ENOMEM;

        *ndev_storage = ndev;

        apc = netdev_priv(ndev);
        apc->ac = ac;
        apc->ndev = ndev;
        apc->max_queues = gc->max_num_queues;
        apc->num_queues = gc->max_num_queues;
        apc->port_handle = INVALID_MANA_HANDLE;
        apc->pf_filter_handle = INVALID_MANA_HANDLE;
        apc->port_idx = port_idx;

        mutex_init(&apc->vport_mutex);
        apc->vport_use_count = 0;

        ndev->netdev_ops = &mana_devops;
        ndev->ethtool_ops = &mana_ethtool_ops;
        ndev->mtu = ETH_DATA_LEN;
        ndev->max_mtu = gc->adapter_mtu - ETH_HLEN;
        ndev->min_mtu = ETH_MIN_MTU;
        ndev->needed_headroom = MANA_HEADROOM;
        ndev->dev_port = port_idx;
        SET_NETDEV_DEV(ndev, gc->dev);

        netif_carrier_off(ndev);

        netdev_rss_key_fill(apc->hashkey, MANA_HASH_KEY_SIZE);

        err = mana_init_port(ndev);
        if (err)
                goto free_net;

        netdev_lockdep_set_classes(ndev);

        ndev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
        ndev->hw_features |= NETIF_F_RXCSUM;
        ndev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
        ndev->hw_features |= NETIF_F_RXHASH;
        ndev->features = ndev->hw_features | NETIF_F_HW_VLAN_CTAG_TX |
                         NETIF_F_HW_VLAN_CTAG_RX;
        ndev->vlan_features = ndev->features;
        ndev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
                             NETDEV_XDP_ACT_NDO_XMIT;

        err = register_netdev(ndev);
        if (err) {
                netdev_err(ndev, "Unable to register netdev.\n");
                goto reset_apc;
        }

        return 0;

reset_apc:
        kfree(apc->rxqs);
        apc->rxqs = NULL;
free_net:
        *ndev_storage = NULL;
        netdev_err(ndev, "Failed to probe vPort %d: %d\n", port_idx, err);
        free_netdev(ndev);
        return err;
}

static void adev_release(struct device *dev)
{
        struct mana_adev *madev = container_of(dev, struct mana_adev, adev.dev);

        kfree(madev);
}

static void remove_adev(struct gdma_dev *gd)
{
        struct auxiliary_device *adev = gd->adev;
        int id = adev->id;

        auxiliary_device_delete(adev);
        auxiliary_device_uninit(adev);

        mana_adev_idx_free(id);
        gd->adev = NULL;
}

static int add_adev(struct gdma_dev *gd)
{
        struct auxiliary_device *adev;
        struct mana_adev *madev;
        int ret;

        madev = kzalloc(sizeof(*madev), GFP_KERNEL);
        if (!madev)
                return -ENOMEM;

        adev = &madev->adev;
        ret = mana_adev_idx_alloc();
        if (ret < 0)
                goto idx_fail;
        adev->id = ret;

        adev->name = "rdma";
        adev->dev.parent = gd->gdma_context->dev;
        adev->dev.release = adev_release;
        madev->mdev = gd;

        ret = auxiliary_device_init(adev);
        if (ret)
                goto init_fail;

        ret = auxiliary_device_add(adev);
        if (ret)
                goto add_fail;

        gd->adev = adev;
        return 0;

add_fail:
        auxiliary_device_uninit(adev);

init_fail:
        mana_adev_idx_free(adev->id);

idx_fail:
        kfree(madev);

        return ret;
}

int mana_probe(struct gdma_dev *gd, bool resuming)
{
        struct gdma_context *gc = gd->gdma_context;
        struct mana_context *ac = gd->driver_data;
        struct device *dev = gc->dev;
        u16 num_ports = 0;
        int err;
        int i;

        dev_info(dev,
                 "Microsoft Azure Network Adapter protocol version: %d.%d.%d\n",
                 MANA_MAJOR_VERSION, MANA_MINOR_VERSION, MANA_MICRO_VERSION);

        err = mana_gd_register_device(gd);
        if (err)
                return err;

        if (!resuming) {
                ac = kzalloc(sizeof(*ac), GFP_KERNEL);
                if (!ac)
                        return -ENOMEM;

                ac->gdma_dev = gd;
                gd->driver_data = ac;
        }

        err = mana_create_eq(ac);
        if (err)
                goto out;

        err = mana_query_device_cfg(ac, MANA_MAJOR_VERSION, MANA_MINOR_VERSION,
                                    MANA_MICRO_VERSION, &num_ports);
        if (err)
                goto out;

        if (!resuming) {
                ac->num_ports = num_ports;
        } else {
                if (ac->num_ports != num_ports) {
                        dev_err(dev, "The number of vPorts changed: %d->%d\n",
                                ac->num_ports, num_ports);
                        err = -EPROTO;
                        goto out;
                }
        }

        if (ac->num_ports == 0)
                dev_err(dev, "Failed to detect any vPort\n");

        if (ac->num_ports > MAX_PORTS_IN_MANA_DEV)
                ac->num_ports = MAX_PORTS_IN_MANA_DEV;

        if (!resuming) {
                for (i = 0; i < ac->num_ports; i++) {
                        err = mana_probe_port(ac, i, &ac->ports[i]);
                        if (err)
                                break;
                }
        } else {
                for (i = 0; i < ac->num_ports; i++) {
                        rtnl_lock();
                        err = mana_attach(ac->ports[i]);
                        rtnl_unlock();
                        if (err)
                                break;
                }
        }

        err = add_adev(gd);
out:
        if (err)
                mana_remove(gd, false);

        return err;
}

void mana_remove(struct gdma_dev *gd, bool suspending)
{
        struct gdma_context *gc = gd->gdma_context;
        struct mana_context *ac = gd->driver_data;
        struct device *dev = gc->dev;
        struct net_device *ndev;
        int err;
        int i;

        /* adev currently doesn't support suspending, always remove it */
        if (gd->adev)
                remove_adev(gd);

        for (i = 0; i < ac->num_ports; i++) {
                ndev = ac->ports[i];
                if (!ndev) {
                        if (i == 0)
                                dev_err(dev, "No net device to remove\n");
                        goto out;
                }

                /* All cleanup actions should stay after rtnl_lock(), otherwise
                 * other functions may access partially cleaned up data.
                 */
                rtnl_lock();

                err = mana_detach(ndev, false);
                if (err)
                        netdev_err(ndev, "Failed to detach vPort %d: %d\n",
                                   i, err);

                if (suspending) {
                        /* No need to unregister the ndev. */
                        rtnl_unlock();
                        continue;
                }

                unregister_netdevice(ndev);

                rtnl_unlock();

                free_netdev(ndev);
        }

        mana_destroy_eq(ac);
out:
        mana_gd_deregister_device(gd);

        if (suspending)
                return;

        gd->driver_data = NULL;
        gd->gdma_context = NULL;
        kfree(ac);
}