/* QLogic qedr NIC Driver
 * Copyright (c) 2015-2016  QLogic Corporation
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and /or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include <linux/dma-mapping.h>
#include <linux/crc32.h>
#include <linux/iommu.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/udp.h>

#include <rdma/ib_verbs.h>
#include <rdma/ib_user_verbs.h>
#include <rdma/iw_cm.h>
#include <rdma/ib_umem.h>
#include <rdma/ib_addr.h>
#include <rdma/ib_cache.h>

#include <linux/qed/qed_if.h>
#include <linux/qed/qed_rdma_if.h>
#include "qedr.h"
#include "verbs.h"
#include <rdma/qedr-abi.h>
#include "qedr_roce_cm.h"

void qedr_inc_sw_gsi_cons(struct qedr_qp_hwq_info *info)
{
        info->gsi_cons = (info->gsi_cons + 1) % info->max_wr;
}

void qedr_store_gsi_qp_cq(struct qedr_dev *dev, struct qedr_qp *qp,
                          struct ib_qp_init_attr *attrs)
{
        dev->gsi_qp_created = 1;
        dev->gsi_sqcq = get_qedr_cq(attrs->send_cq);
        dev->gsi_rqcq = get_qedr_cq(attrs->recv_cq);
        dev->gsi_qp = qp;
}

static void qedr_ll2_complete_tx_packet(void *cxt, u8 connection_handle,
                                        void *cookie,
                                        dma_addr_t first_frag_addr,
                                        bool b_last_fragment,
                                        bool b_last_packet)
{
        struct qedr_dev *dev = (struct qedr_dev *)cxt;
        struct qed_roce_ll2_packet *pkt = cookie;
        struct qedr_cq *cq = dev->gsi_sqcq;
        struct qedr_qp *qp = dev->gsi_qp;
        unsigned long flags;

        DP_DEBUG(dev, QEDR_MSG_GSI,
                 "LL2 TX CB: gsi_sqcq=%p, gsi_rqcq=%p, gsi_cons=%d, ibcq_comp=%s\n",
                 dev->gsi_sqcq, dev->gsi_rqcq, qp->sq.gsi_cons,
                 cq->ibcq.comp_handler ? "Yes" : "No");

        dma_free_coherent(&dev->pdev->dev, pkt->header.len, pkt->header.vaddr,
                          pkt->header.baddr);
        kfree(pkt);

        spin_lock_irqsave(&qp->q_lock, flags);
        qedr_inc_sw_gsi_cons(&qp->sq);
        spin_unlock_irqrestore(&qp->q_lock, flags);

        if (cq->ibcq.comp_handler)
                (*cq->ibcq.comp_handler) (&cq->ibcq, cq->ibcq.cq_context);
}

static void qedr_ll2_complete_rx_packet(void *cxt,
                                        struct qed_ll2_comp_rx_data *data)
{
        struct qedr_dev *dev = (struct qedr_dev *)cxt;
        struct qedr_cq *cq = dev->gsi_rqcq;
        struct qedr_qp *qp = dev->gsi_qp;
        unsigned long flags;

        spin_lock_irqsave(&qp->q_lock, flags);

        qp->rqe_wr_id[qp->rq.gsi_cons].rc = data->u.data_length_error ?
                -EINVAL : 0;
        qp->rqe_wr_id[qp->rq.gsi_cons].vlan = data->vlan;
        /* note: length stands for data length i.e. GRH is excluded */
        qp->rqe_wr_id[qp->rq.gsi_cons].sg_list[0].length =
                data->length.data_length;
        *((u32 *)&qp->rqe_wr_id[qp->rq.gsi_cons].smac[0]) =
                ntohl(data->opaque_data_0);
        *((u16 *)&qp->rqe_wr_id[qp->rq.gsi_cons].smac[4]) =
                ntohs((u16)data->opaque_data_1);

        qedr_inc_sw_gsi_cons(&qp->rq);

        spin_unlock_irqrestore(&qp->q_lock, flags);

        if (cq->ibcq.comp_handler)
                (*cq->ibcq.comp_handler) (&cq->ibcq, cq->ibcq.cq_context);
}

static void qedr_ll2_release_rx_packet(void *cxt, u8 connection_handle,
                                       void *cookie, dma_addr_t rx_buf_addr,
                                       bool b_last_packet)
{
        /* Do nothing... */
}

static void qedr_destroy_gsi_cq(struct qedr_dev *dev,
                                struct ib_qp_init_attr *attrs)
{
        struct qed_rdma_destroy_cq_in_params iparams;
        struct qed_rdma_destroy_cq_out_params oparams;
        struct qedr_cq *cq;

        cq = get_qedr_cq(attrs->send_cq);
        iparams.icid = cq->icid;
        dev->ops->rdma_destroy_cq(dev->rdma_ctx, &iparams, &oparams);
        dev->ops->common->chain_free(dev->cdev, &cq->pbl);

        cq = get_qedr_cq(attrs->recv_cq);
        /* if a dedicated recv_cq was used, delete it too */
        if (iparams.icid != cq->icid) {
                iparams.icid = cq->icid;
                dev->ops->rdma_destroy_cq(dev->rdma_ctx, &iparams, &oparams);
                dev->ops->common->chain_free(dev->cdev, &cq->pbl);
        }
}

static inline int qedr_check_gsi_qp_attrs(struct qedr_dev *dev,
                                          struct ib_qp_init_attr *attrs)
{
        if (attrs->cap.max_recv_sge > QEDR_GSI_MAX_RECV_SGE) {
                DP_ERR(dev,
                       " create gsi qp: failed. max_recv_sge is larger the max %d>%d\n",
                       attrs->cap.max_recv_sge, QEDR_GSI_MAX_RECV_SGE);
                return -EINVAL;
        }

        if (attrs->cap.max_recv_wr > QEDR_GSI_MAX_RECV_WR) {
                DP_ERR(dev,
                       " create gsi qp: failed. max_recv_wr is too large %d>%d\n",
                       attrs->cap.max_recv_wr, QEDR_GSI_MAX_RECV_WR);
                return -EINVAL;
        }

        if (attrs->cap.max_send_wr > QEDR_GSI_MAX_SEND_WR) {
                DP_ERR(dev,
                       " create gsi qp: failed. max_send_wr is too large %d>%d\n",
                       attrs->cap.max_send_wr, QEDR_GSI_MAX_SEND_WR);
                return -EINVAL;
        }

        return 0;
}

static int qedr_ll2_post_tx(struct qedr_dev *dev,
                            struct qed_roce_ll2_packet *pkt)
{
        enum qed_ll2_roce_flavor_type roce_flavor;
        struct qed_ll2_tx_pkt_info ll2_tx_pkt;
        int rc;
        int i;

        memset(&ll2_tx_pkt, 0, sizeof(ll2_tx_pkt));

        roce_flavor = (pkt->roce_mode == ROCE_V1) ?
            QED_LL2_ROCE : QED_LL2_RROCE;

        if (pkt->roce_mode == ROCE_V2_IPV4)
                ll2_tx_pkt.enable_ip_cksum = 1;

        ll2_tx_pkt.num_of_bds = 1 /* hdr */  + pkt->n_seg;
        ll2_tx_pkt.vlan = 0;
        ll2_tx_pkt.tx_dest = pkt->tx_dest;
        ll2_tx_pkt.qed_roce_flavor = roce_flavor;
        ll2_tx_pkt.first_frag = pkt->header.baddr;
        ll2_tx_pkt.first_frag_len = pkt->header.len;
        ll2_tx_pkt.cookie = pkt;

        /* tx header */
        rc = dev->ops->ll2_prepare_tx_packet(dev->rdma_ctx,
                                             dev->gsi_ll2_handle,
                                             &ll2_tx_pkt, 1);
        if (rc) {
                /* TX failed while posting header - release resources */
                dma_free_coherent(&dev->pdev->dev, pkt->header.len,
                                  pkt->header.vaddr, pkt->header.baddr);
                kfree(pkt);

                DP_ERR(dev, "roce ll2 tx: header failed (rc=%d)\n", rc);
                return rc;
        }

        /* tx payload */
        for (i = 0; i < pkt->n_seg; i++) {
                rc = dev->ops->ll2_set_fragment_of_tx_packet(
                        dev->rdma_ctx,
                        dev->gsi_ll2_handle,
                        pkt->payload[i].baddr,
                        pkt->payload[i].len);

                if (rc) {
                        /* if failed not much to do here, partial packet has
                         * been posted we can't free memory, will need to wait
                         * for completion
                         */
                        DP_ERR(dev, "ll2 tx: payload failed (rc=%d)\n", rc);
                        return rc;
                }
        }

        return 0;
}

static int qedr_ll2_stop(struct qedr_dev *dev)
{
        int rc;

        if (dev->gsi_ll2_handle == QED_LL2_UNUSED_HANDLE)
                return 0;

        /* remove LL2 MAC address filter */
        rc = dev->ops->ll2_set_mac_filter(dev->cdev,
                                          dev->gsi_ll2_mac_address, NULL);

        rc = dev->ops->ll2_terminate_connection(dev->rdma_ctx,
                                                dev->gsi_ll2_handle);
        if (rc)
                DP_ERR(dev, "Failed to terminate LL2 connection (rc=%d)\n", rc);

        dev->ops->ll2_release_connection(dev->rdma_ctx, dev->gsi_ll2_handle);

        dev->gsi_ll2_handle = QED_LL2_UNUSED_HANDLE;

        return rc;
}

static int qedr_ll2_start(struct qedr_dev *dev,
                          struct ib_qp_init_attr *attrs, struct qedr_qp *qp)
{
        struct qed_ll2_acquire_data data;
        struct qed_ll2_cbs cbs;
        int rc;

        /* configure and start LL2 */
        cbs.rx_comp_cb = qedr_ll2_complete_rx_packet;
        cbs.tx_comp_cb = qedr_ll2_complete_tx_packet;
        cbs.rx_release_cb = qedr_ll2_release_rx_packet;
        cbs.tx_release_cb = qedr_ll2_complete_tx_packet;
        cbs.cookie = dev;

        memset(&data, 0, sizeof(data));
        data.input.conn_type = QED_LL2_TYPE_ROCE;
        data.input.mtu = dev->ndev->mtu;
        data.input.rx_num_desc = attrs->cap.max_recv_wr;
        data.input.rx_drop_ttl0_flg = true;
        data.input.rx_vlan_removal_en = false;
        data.input.tx_num_desc = attrs->cap.max_send_wr;
        data.input.tx_tc = 0;
        data.input.tx_dest = QED_LL2_TX_DEST_NW;
        data.input.ai_err_packet_too_big = QED_LL2_DROP_PACKET;
        data.input.ai_err_no_buf = QED_LL2_DROP_PACKET;
        data.input.gsi_enable = 1;
        data.p_connection_handle = &dev->gsi_ll2_handle;
        data.cbs = &cbs;

        rc = dev->ops->ll2_acquire_connection(dev->rdma_ctx, &data);
        if (rc) {
                DP_ERR(dev,
                       "ll2 start: failed to acquire LL2 connection (rc=%d)\n",
                       rc);
                return rc;
        }

        rc = dev->ops->ll2_establish_connection(dev->rdma_ctx,
                                                dev->gsi_ll2_handle);
        if (rc) {
                DP_ERR(dev,
                       "ll2 start: failed to establish LL2 connection (rc=%d)\n",
                       rc);
                goto err1;
        }

        rc = dev->ops->ll2_set_mac_filter(dev->cdev, NULL, dev->ndev->dev_addr);
        if (rc)
                goto err2;

        return 0;

err2:
        dev->ops->ll2_terminate_connection(dev->rdma_ctx, dev->gsi_ll2_handle);
err1:
        dev->ops->ll2_release_connection(dev->rdma_ctx, dev->gsi_ll2_handle);

        return rc;
}

int qedr_create_gsi_qp(struct qedr_dev *dev, struct ib_qp_init_attr *attrs,
                       struct qedr_qp *qp)
{
        int rc;

        rc = qedr_check_gsi_qp_attrs(dev, attrs);
        if (rc)
                return rc;

        rc = qedr_ll2_start(dev, attrs, qp);
        if (rc) {
                DP_ERR(dev, "create gsi qp: failed on ll2 start. rc=%d\n", rc);
                return rc;
        }

        /* create QP */
        qp->ibqp.qp_num = 1;
        qp->rq.max_wr = attrs->cap.max_recv_wr;
        qp->sq.max_wr = attrs->cap.max_send_wr;

        qp->rqe_wr_id = kzalloc_objs(*qp->rqe_wr_id, qp->rq.max_wr);
        if (!qp->rqe_wr_id)
                goto err;
        qp->wqe_wr_id = kzalloc_objs(*qp->wqe_wr_id, qp->sq.max_wr);
        if (!qp->wqe_wr_id)
                goto err;

        qedr_store_gsi_qp_cq(dev, qp, attrs);
        ether_addr_copy(dev->gsi_ll2_mac_address, dev->ndev->dev_addr);

        /* the GSI CQ is handled by the driver so remove it from the FW */
        qedr_destroy_gsi_cq(dev, attrs);
        dev->gsi_rqcq->cq_type = QEDR_CQ_TYPE_GSI;

        DP_DEBUG(dev, QEDR_MSG_GSI, "created GSI QP %p\n", qp);

        return 0;

err:
        kfree(qp->rqe_wr_id);

        rc = qedr_ll2_stop(dev);
        if (rc)
                DP_ERR(dev, "create gsi qp: failed destroy on create\n");

        return -ENOMEM;
}

int qedr_destroy_gsi_qp(struct qedr_dev *dev)
{
        return qedr_ll2_stop(dev);
}

#define QEDR_MAX_UD_HEADER_SIZE (100)
#define QEDR_GSI_QPN            (1)
static inline int qedr_gsi_build_header(struct qedr_dev *dev,
                                        struct qedr_qp *qp,
                                        const struct ib_send_wr *swr,
                                        struct ib_ud_header *udh,
                                        int *roce_mode)
{
        bool has_vlan = false, has_grh_ipv6 = true;
        struct rdma_ah_attr *ah_attr = &get_qedr_ah(ud_wr(swr)->ah)->attr;
        const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
        const struct ib_gid_attr *sgid_attr = grh->sgid_attr;
        int send_size = 0;
        u16 vlan_id = 0;
        u16 ether_type;
        int rc;
        int ip_ver = 0;

        bool has_udp = false;
        int i;

        rc = rdma_read_gid_l2_fields(sgid_attr, &vlan_id, NULL);
        if (rc)
                return rc;

        if (vlan_id < VLAN_CFI_MASK)
                has_vlan = true;

        send_size = 0;
        for (i = 0; i < swr->num_sge; ++i)
                send_size += swr->sg_list[i].length;

        has_udp = (sgid_attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP);
        if (!has_udp) {
                /* RoCE v1 */
                ether_type = ETH_P_IBOE;
                *roce_mode = ROCE_V1;
        } else if (ipv6_addr_v4mapped((struct in6_addr *)&sgid_attr->gid)) {
                /* RoCE v2 IPv4 */
                ip_ver = 4;
                ether_type = ETH_P_IP;
                has_grh_ipv6 = false;
                *roce_mode = ROCE_V2_IPV4;
        } else {
                /* RoCE v2 IPv6 */
                ip_ver = 6;
                ether_type = ETH_P_IPV6;
                *roce_mode = ROCE_V2_IPV6;
        }

        rc = ib_ud_header_init(send_size, false, true, has_vlan,
                               has_grh_ipv6, ip_ver, has_udp, 0, udh);
        if (rc) {
                DP_ERR(dev, "gsi post send: failed to init header\n");
                return rc;
        }

        /* ENET + VLAN headers */
        ether_addr_copy(udh->eth.dmac_h, ah_attr->roce.dmac);
        ether_addr_copy(udh->eth.smac_h, dev->ndev->dev_addr);
        if (has_vlan) {
                udh->eth.type = htons(ETH_P_8021Q);
                udh->vlan.tag = htons(vlan_id);
                udh->vlan.type = htons(ether_type);
        } else {
                udh->eth.type = htons(ether_type);
        }

        /* BTH */
        udh->bth.solicited_event = !!(swr->send_flags & IB_SEND_SOLICITED);
        udh->bth.pkey = QEDR_ROCE_PKEY_DEFAULT;
        udh->bth.destination_qpn = htonl(ud_wr(swr)->remote_qpn);
        udh->bth.psn = htonl((qp->sq_psn++) & ((1 << 24) - 1));
        udh->bth.opcode = IB_OPCODE_UD_SEND_ONLY;

        /* DETH */
        udh->deth.qkey = htonl(0x80010000);
        udh->deth.source_qpn = htonl(QEDR_GSI_QPN);

        if (has_grh_ipv6) {
                /* GRH / IPv6 header */
                udh->grh.traffic_class = grh->traffic_class;
                udh->grh.flow_label = grh->flow_label;
                udh->grh.hop_limit = grh->hop_limit;
                udh->grh.destination_gid = grh->dgid;
                memcpy(&udh->grh.source_gid.raw, sgid_attr->gid.raw,
                       sizeof(udh->grh.source_gid.raw));
        } else {
                /* IPv4 header */
                u32 ipv4_addr;

                udh->ip4.protocol = IPPROTO_UDP;
                udh->ip4.tos = htonl(grh->flow_label);
                udh->ip4.frag_off = htons(IP_DF);
                udh->ip4.ttl = grh->hop_limit;

                ipv4_addr = qedr_get_ipv4_from_gid(sgid_attr->gid.raw);
                udh->ip4.saddr = ipv4_addr;
                ipv4_addr = qedr_get_ipv4_from_gid(grh->dgid.raw);
                udh->ip4.daddr = ipv4_addr;
                /* note: checksum is calculated by the device */
        }

        /* UDP */
        if (has_udp) {
                udh->udp.sport = htons(QEDR_ROCE_V2_UDP_SPORT);
                udh->udp.dport = htons(ROCE_V2_UDP_DPORT);
                udh->udp.csum = 0;
                /* UDP length is untouched hence is zero */
        }
        return 0;
}

static inline int qedr_gsi_build_packet(struct qedr_dev *dev,
                                        struct qedr_qp *qp,
                                        const struct ib_send_wr *swr,
                                        struct qed_roce_ll2_packet **p_packet)
{
        u8 ud_header_buffer[QEDR_MAX_UD_HEADER_SIZE];
        struct qed_roce_ll2_packet *packet;
        struct pci_dev *pdev = dev->pdev;
        int roce_mode, header_size;
        struct ib_ud_header udh;
        int i, rc;

        *p_packet = NULL;

        rc = qedr_gsi_build_header(dev, qp, swr, &udh, &roce_mode);
        if (rc)
                return rc;

        header_size = ib_ud_header_pack(&udh, &ud_header_buffer);

        packet = kzalloc_obj(*packet, GFP_ATOMIC);
        if (!packet)
                return -ENOMEM;

        packet->header.vaddr = dma_alloc_coherent(&pdev->dev, header_size,
                                                  &packet->header.baddr,
                                                  GFP_ATOMIC);
        if (!packet->header.vaddr) {
                kfree(packet);
                return -ENOMEM;
        }

        if (ether_addr_equal(udh.eth.smac_h, udh.eth.dmac_h))
                packet->tx_dest = QED_LL2_TX_DEST_LB;
        else
                packet->tx_dest = QED_LL2_TX_DEST_NW;

        packet->roce_mode = roce_mode;
        memcpy(packet->header.vaddr, ud_header_buffer, header_size);
        packet->header.len = header_size;
        packet->n_seg = swr->num_sge;
        for (i = 0; i < packet->n_seg; i++) {
                packet->payload[i].baddr = swr->sg_list[i].addr;
                packet->payload[i].len = swr->sg_list[i].length;
        }

        *p_packet = packet;

        return 0;
}

int qedr_gsi_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr,
                       const struct ib_send_wr **bad_wr)
{
        struct qed_roce_ll2_packet *pkt = NULL;
        struct qedr_qp *qp = get_qedr_qp(ibqp);
        struct qedr_dev *dev = qp->dev;
        unsigned long flags;
        int rc;

        if (qp->state != QED_ROCE_QP_STATE_RTS) {
                *bad_wr = wr;
                DP_ERR(dev,
                       "gsi post recv: failed to post rx buffer. state is %d and not QED_ROCE_QP_STATE_RTS\n",
                       qp->state);
                return -EINVAL;
        }

        if (wr->num_sge > RDMA_MAX_SGE_PER_SQ_WQE) {
                DP_ERR(dev, "gsi post send: num_sge is too large (%d>%d)\n",
                       wr->num_sge, RDMA_MAX_SGE_PER_SQ_WQE);
                rc = -EINVAL;
                goto err;
        }

        if (wr->opcode != IB_WR_SEND) {
                DP_ERR(dev,
                       "gsi post send: failed due to unsupported opcode %d\n",
                       wr->opcode);
                rc = -EINVAL;
                goto err;
        }

        spin_lock_irqsave(&qp->q_lock, flags);

        rc = qedr_gsi_build_packet(dev, qp, wr, &pkt);
        if (rc) {
                spin_unlock_irqrestore(&qp->q_lock, flags);
                goto err;
        }

        rc = qedr_ll2_post_tx(dev, pkt);

        if (!rc) {
                qp->wqe_wr_id[qp->sq.prod].wr_id = wr->wr_id;
                qedr_inc_sw_prod(&qp->sq);
                DP_DEBUG(qp->dev, QEDR_MSG_GSI,
                         "gsi post send: opcode=%d, wr_id=%llx\n", wr->opcode,
                         wr->wr_id);
        } else {
                DP_ERR(dev, "gsi post send: failed to transmit (rc=%d)\n", rc);
                rc = -EAGAIN;
                *bad_wr = wr;
        }

        spin_unlock_irqrestore(&qp->q_lock, flags);

        if (wr->next) {
                DP_ERR(dev,
                       "gsi post send: failed second WR. Only one WR may be passed at a time\n");
                *bad_wr = wr->next;
                rc = -EINVAL;
        }

        return rc;

err:
        *bad_wr = wr;
        return rc;
}

int qedr_gsi_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
                       const struct ib_recv_wr **bad_wr)
{
        struct qedr_dev *dev = get_qedr_dev(ibqp->device);
        struct qedr_qp *qp = get_qedr_qp(ibqp);
        unsigned long flags;
        int rc = 0;

        if ((qp->state != QED_ROCE_QP_STATE_RTR) &&
            (qp->state != QED_ROCE_QP_STATE_RTS)) {
                *bad_wr = wr;
                DP_ERR(dev,
                       "gsi post recv: failed to post rx buffer. state is %d and not QED_ROCE_QP_STATE_RTR/S\n",
                       qp->state);
                return -EINVAL;
        }

        spin_lock_irqsave(&qp->q_lock, flags);

        while (wr) {
                if (wr->num_sge > QEDR_GSI_MAX_RECV_SGE) {
                        DP_ERR(dev,
                               "gsi post recv: failed to post rx buffer. too many sges %d>%d\n",
                               wr->num_sge, QEDR_GSI_MAX_RECV_SGE);
                        goto err;
                }

                rc = dev->ops->ll2_post_rx_buffer(dev->rdma_ctx,
                                                  dev->gsi_ll2_handle,
                                                  wr->sg_list[0].addr,
                                                  wr->sg_list[0].length,
                                                  NULL /* cookie */,
                                                  1 /* notify_fw */);
                if (rc) {
                        DP_ERR(dev,
                               "gsi post recv: failed to post rx buffer (rc=%d)\n",
                               rc);
                        goto err;
                }

                memset(&qp->rqe_wr_id[qp->rq.prod], 0,
                       sizeof(qp->rqe_wr_id[qp->rq.prod]));
                qp->rqe_wr_id[qp->rq.prod].sg_list[0] = wr->sg_list[0];
                qp->rqe_wr_id[qp->rq.prod].wr_id = wr->wr_id;

                qedr_inc_sw_prod(&qp->rq);

                wr = wr->next;
        }

        spin_unlock_irqrestore(&qp->q_lock, flags);

        return rc;
err:
        spin_unlock_irqrestore(&qp->q_lock, flags);
        *bad_wr = wr;
        return -ENOMEM;
}

int qedr_gsi_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
{
        struct qedr_dev *dev = get_qedr_dev(ibcq->device);
        struct qedr_cq *cq = get_qedr_cq(ibcq);
        struct qedr_qp *qp = dev->gsi_qp;
        unsigned long flags;
        u16 vlan_id;
        int i = 0;

        spin_lock_irqsave(&cq->cq_lock, flags);

        while (i < num_entries && qp->rq.cons != qp->rq.gsi_cons) {
                memset(&wc[i], 0, sizeof(*wc));

                wc[i].qp = &qp->ibqp;
                wc[i].wr_id = qp->rqe_wr_id[qp->rq.cons].wr_id;
                wc[i].opcode = IB_WC_RECV;
                wc[i].pkey_index = 0;
                wc[i].status = (qp->rqe_wr_id[qp->rq.cons].rc) ?
                    IB_WC_GENERAL_ERR : IB_WC_SUCCESS;
                /* 0 - currently only one recv sg is supported */
                wc[i].byte_len = qp->rqe_wr_id[qp->rq.cons].sg_list[0].length;
                wc[i].wc_flags |= IB_WC_GRH | IB_WC_IP_CSUM_OK;
                ether_addr_copy(wc[i].smac, qp->rqe_wr_id[qp->rq.cons].smac);
                wc[i].wc_flags |= IB_WC_WITH_SMAC;

                vlan_id = qp->rqe_wr_id[qp->rq.cons].vlan &
                          VLAN_VID_MASK;
                if (vlan_id) {
                        wc[i].wc_flags |= IB_WC_WITH_VLAN;
                        wc[i].vlan_id = vlan_id;
                        wc[i].sl = (qp->rqe_wr_id[qp->rq.cons].vlan &
                                    VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
                }

                qedr_inc_sw_cons(&qp->rq);
                i++;
        }

        while (i < num_entries && qp->sq.cons != qp->sq.gsi_cons) {
                memset(&wc[i], 0, sizeof(*wc));

                wc[i].qp = &qp->ibqp;
                wc[i].wr_id = qp->wqe_wr_id[qp->sq.cons].wr_id;
                wc[i].opcode = IB_WC_SEND;
                wc[i].status = IB_WC_SUCCESS;

                qedr_inc_sw_cons(&qp->sq);
                i++;
        }

        spin_unlock_irqrestore(&cq->cq_lock, flags);

        DP_DEBUG(dev, QEDR_MSG_GSI,
                 "gsi poll_cq: requested entries=%d, actual=%d, qp->rq.cons=%d, qp->rq.gsi_cons=%x, qp->sq.cons=%d, qp->sq.gsi_cons=%d, qp_num=%d\n",
                 num_entries, i, qp->rq.cons, qp->rq.gsi_cons, qp->sq.cons,
                 qp->sq.gsi_cons, qp->ibqp.qp_num);

        return i;
}