Merge tag 'mmc-v4.15-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc

[mirror_ubuntu-bionic-kernel.git] / drivers / target / iscsi / cxgbit / cxgbit_main.c

/*
 * Copyright (c) 2016 Chelsio Communications, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#define DRV_NAME "cxgbit"
#define DRV_VERSION "1.0.0-ko"
#define pr_fmt(fmt) DRV_NAME ": " fmt

#include "cxgbit.h"

#ifdef CONFIG_CHELSIO_T4_DCB
#include <net/dcbevent.h>
#include "cxgb4_dcb.h"
#endif

LIST_HEAD(cdev_list_head);
/* cdev list lock */
DEFINE_MUTEX(cdev_list_lock);

void _cxgbit_free_cdev(struct kref *kref)
{
        struct cxgbit_device *cdev;

        cdev = container_of(kref, struct cxgbit_device, kref);

        cxgbi_ppm_release(cdev2ppm(cdev));
        kfree(cdev);
}

static void cxgbit_set_mdsl(struct cxgbit_device *cdev)
{
        struct cxgb4_lld_info *lldi = &cdev->lldi;
        u32 mdsl;

#define ULP2_MAX_PKT_LEN 16224
#define ISCSI_PDU_NONPAYLOAD_LEN 312
        mdsl = min_t(u32, lldi->iscsi_iolen - ISCSI_PDU_NONPAYLOAD_LEN,
                     ULP2_MAX_PKT_LEN - ISCSI_PDU_NONPAYLOAD_LEN);
        mdsl = min_t(u32, mdsl, 8192);
        mdsl = min_t(u32, mdsl, (MAX_SKB_FRAGS - 1) * PAGE_SIZE);

        cdev->mdsl = mdsl;
}

static void *cxgbit_uld_add(const struct cxgb4_lld_info *lldi)
{
        struct cxgbit_device *cdev;

        if (is_t4(lldi->adapter_type))
                return ERR_PTR(-ENODEV);

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

        kref_init(&cdev->kref);

        cdev->lldi = *lldi;

        cxgbit_set_mdsl(cdev);

        if (cxgbit_ddp_init(cdev) < 0) {
                kfree(cdev);
                return ERR_PTR(-EINVAL);
        }

        if (!test_bit(CDEV_DDP_ENABLE, &cdev->flags))
                pr_info("cdev %s ddp init failed\n",
                        pci_name(lldi->pdev));

        if (lldi->fw_vers >= 0x10d2b00)
                set_bit(CDEV_ISO_ENABLE, &cdev->flags);

        spin_lock_init(&cdev->cskq.lock);
        INIT_LIST_HEAD(&cdev->cskq.list);

        mutex_lock(&cdev_list_lock);
        list_add_tail(&cdev->list, &cdev_list_head);
        mutex_unlock(&cdev_list_lock);

        pr_info("cdev %s added for iSCSI target transport\n",
                pci_name(lldi->pdev));

        return cdev;
}

static void cxgbit_close_conn(struct cxgbit_device *cdev)
{
        struct cxgbit_sock *csk;
        struct sk_buff *skb;
        bool wakeup_thread = false;

        spin_lock_bh(&cdev->cskq.lock);
        list_for_each_entry(csk, &cdev->cskq.list, list) {
                skb = alloc_skb(0, GFP_ATOMIC);
                if (!skb)
                        continue;

                spin_lock_bh(&csk->rxq.lock);
                __skb_queue_tail(&csk->rxq, skb);
                if (skb_queue_len(&csk->rxq) == 1)
                        wakeup_thread = true;
                spin_unlock_bh(&csk->rxq.lock);

                if (wakeup_thread) {
                        wake_up(&csk->waitq);
                        wakeup_thread = false;
                }
        }
        spin_unlock_bh(&cdev->cskq.lock);
}

static void cxgbit_detach_cdev(struct cxgbit_device *cdev)
{
        bool free_cdev = false;

        spin_lock_bh(&cdev->cskq.lock);
        if (list_empty(&cdev->cskq.list))
                free_cdev = true;
        spin_unlock_bh(&cdev->cskq.lock);

        if (free_cdev) {
                mutex_lock(&cdev_list_lock);
                list_del(&cdev->list);
                mutex_unlock(&cdev_list_lock);

                cxgbit_put_cdev(cdev);
        } else {
                cxgbit_close_conn(cdev);
        }
}

static int cxgbit_uld_state_change(void *handle, enum cxgb4_state state)
{
        struct cxgbit_device *cdev = handle;

        switch (state) {
        case CXGB4_STATE_UP:
                set_bit(CDEV_STATE_UP, &cdev->flags);
                pr_info("cdev %s state UP.\n", pci_name(cdev->lldi.pdev));
                break;
        case CXGB4_STATE_START_RECOVERY:
                clear_bit(CDEV_STATE_UP, &cdev->flags);
                cxgbit_close_conn(cdev);
                pr_info("cdev %s state RECOVERY.\n", pci_name(cdev->lldi.pdev));
                break;
        case CXGB4_STATE_DOWN:
                pr_info("cdev %s state DOWN.\n", pci_name(cdev->lldi.pdev));
                break;
        case CXGB4_STATE_DETACH:
                clear_bit(CDEV_STATE_UP, &cdev->flags);
                pr_info("cdev %s state DETACH.\n", pci_name(cdev->lldi.pdev));
                cxgbit_detach_cdev(cdev);
                break;
        default:
                pr_info("cdev %s unknown state %d.\n",
                        pci_name(cdev->lldi.pdev), state);
                break;
        }
        return 0;
}

static void
cxgbit_process_ddpvld(struct cxgbit_sock *csk, struct cxgbit_lro_pdu_cb *pdu_cb,
                      u32 ddpvld)
{

        if (ddpvld & (1 << CPL_RX_ISCSI_DDP_STATUS_HCRC_SHIFT)) {
                pr_info("tid 0x%x, status 0x%x, hcrc bad.\n", csk->tid, ddpvld);
                pdu_cb->flags |= PDUCBF_RX_HCRC_ERR;
        }

        if (ddpvld & (1 << CPL_RX_ISCSI_DDP_STATUS_DCRC_SHIFT)) {
                pr_info("tid 0x%x, status 0x%x, dcrc bad.\n", csk->tid, ddpvld);
                pdu_cb->flags |= PDUCBF_RX_DCRC_ERR;
        }

        if (ddpvld & (1 << CPL_RX_ISCSI_DDP_STATUS_PAD_SHIFT))
                pr_info("tid 0x%x, status 0x%x, pad bad.\n", csk->tid, ddpvld);

        if ((ddpvld & (1 << CPL_RX_ISCSI_DDP_STATUS_DDP_SHIFT)) &&
            (!(pdu_cb->flags & PDUCBF_RX_DATA))) {
                pdu_cb->flags |= PDUCBF_RX_DATA_DDPD;
        }
}

static void
cxgbit_lro_add_packet_rsp(struct sk_buff *skb, u8 op, const __be64 *rsp)
{
        struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
        struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb,
                                                lro_cb->pdu_idx);
        struct cpl_rx_iscsi_ddp *cpl = (struct cpl_rx_iscsi_ddp *)(rsp + 1);

        cxgbit_process_ddpvld(lro_cb->csk, pdu_cb, be32_to_cpu(cpl->ddpvld));

        pdu_cb->flags |= PDUCBF_RX_STATUS;
        pdu_cb->ddigest = ntohl(cpl->ulp_crc);
        pdu_cb->pdulen = ntohs(cpl->len);

        if (pdu_cb->flags & PDUCBF_RX_HDR)
                pdu_cb->complete = true;

        lro_cb->pdu_totallen += pdu_cb->pdulen;
        lro_cb->complete = true;
        lro_cb->pdu_idx++;
}

static void
cxgbit_copy_frags(struct sk_buff *skb, const struct pkt_gl *gl,
                  unsigned int offset)
{
        u8 skb_frag_idx = skb_shinfo(skb)->nr_frags;
        u8 i;

        /* usually there's just one frag */
        __skb_fill_page_desc(skb, skb_frag_idx, gl->frags[0].page,
                             gl->frags[0].offset + offset,
                             gl->frags[0].size - offset);
        for (i = 1; i < gl->nfrags; i++)
                __skb_fill_page_desc(skb, skb_frag_idx + i,
                                     gl->frags[i].page,
                                     gl->frags[i].offset,
                                     gl->frags[i].size);

        skb_shinfo(skb)->nr_frags += gl->nfrags;

        /* get a reference to the last page, we don't own it */
        get_page(gl->frags[gl->nfrags - 1].page);
}

static void
cxgbit_lro_add_packet_gl(struct sk_buff *skb, u8 op, const struct pkt_gl *gl)
{
        struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
        struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb,
                                                lro_cb->pdu_idx);
        u32 len, offset;

        if (op == CPL_ISCSI_HDR) {
                struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)gl->va;

                offset = sizeof(struct cpl_iscsi_hdr);
                pdu_cb->flags |= PDUCBF_RX_HDR;
                pdu_cb->seq = ntohl(cpl->seq);
                len = ntohs(cpl->len);
                pdu_cb->hdr = gl->va + offset;
                pdu_cb->hlen = len;
                pdu_cb->hfrag_idx = skb_shinfo(skb)->nr_frags;

                if (unlikely(gl->nfrags > 1))
                        cxgbit_skcb_flags(skb) = 0;

                lro_cb->complete = false;
        } else if (op == CPL_ISCSI_DATA) {
                struct cpl_iscsi_data *cpl = (struct cpl_iscsi_data *)gl->va;

                offset = sizeof(struct cpl_iscsi_data);
                pdu_cb->flags |= PDUCBF_RX_DATA;
                len = ntohs(cpl->len);
                pdu_cb->dlen = len;
                pdu_cb->doffset = lro_cb->offset;
                pdu_cb->nr_dfrags = gl->nfrags;
                pdu_cb->dfrag_idx = skb_shinfo(skb)->nr_frags;
                lro_cb->complete = false;
        } else {
                struct cpl_rx_iscsi_cmp *cpl;

                cpl = (struct cpl_rx_iscsi_cmp *)gl->va;
                offset = sizeof(struct cpl_rx_iscsi_cmp);
                pdu_cb->flags |= (PDUCBF_RX_HDR | PDUCBF_RX_STATUS);
                len = be16_to_cpu(cpl->len);
                pdu_cb->hdr = gl->va + offset;
                pdu_cb->hlen = len;
                pdu_cb->hfrag_idx = skb_shinfo(skb)->nr_frags;
                pdu_cb->ddigest = be32_to_cpu(cpl->ulp_crc);
                pdu_cb->pdulen = ntohs(cpl->len);

                if (unlikely(gl->nfrags > 1))
                        cxgbit_skcb_flags(skb) = 0;

                cxgbit_process_ddpvld(lro_cb->csk, pdu_cb,
                                      be32_to_cpu(cpl->ddpvld));

                if (pdu_cb->flags & PDUCBF_RX_DATA_DDPD) {
                        pdu_cb->flags |= PDUCBF_RX_DDP_CMP;
                        pdu_cb->complete = true;
                } else if (pdu_cb->flags & PDUCBF_RX_DATA) {
                        pdu_cb->complete = true;
                }

                lro_cb->pdu_totallen += pdu_cb->hlen + pdu_cb->dlen;
                lro_cb->complete = true;
                lro_cb->pdu_idx++;
        }

        cxgbit_copy_frags(skb, gl, offset);

        pdu_cb->frags += gl->nfrags;
        lro_cb->offset += len;
        skb->len += len;
        skb->data_len += len;
        skb->truesize += len;
}

static struct sk_buff *
cxgbit_lro_init_skb(struct cxgbit_sock *csk, u8 op, const struct pkt_gl *gl,
                    const __be64 *rsp, struct napi_struct *napi)
{
        struct sk_buff *skb;
        struct cxgbit_lro_cb *lro_cb;

        skb = napi_alloc_skb(napi, LRO_SKB_MAX_HEADROOM);

        if (unlikely(!skb))
                return NULL;

        memset(skb->data, 0, LRO_SKB_MAX_HEADROOM);

        cxgbit_skcb_flags(skb) |= SKCBF_RX_LRO;

        lro_cb = cxgbit_skb_lro_cb(skb);

        cxgbit_get_csk(csk);

        lro_cb->csk = csk;

        return skb;
}

static void cxgbit_queue_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
{
        bool wakeup_thread = false;

        spin_lock(&csk->rxq.lock);
        __skb_queue_tail(&csk->rxq, skb);
        if (skb_queue_len(&csk->rxq) == 1)
                wakeup_thread = true;
        spin_unlock(&csk->rxq.lock);

        if (wakeup_thread)
                wake_up(&csk->waitq);
}

static void cxgbit_lro_flush(struct t4_lro_mgr *lro_mgr, struct sk_buff *skb)
{
        struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
        struct cxgbit_sock *csk = lro_cb->csk;

        csk->lro_skb = NULL;

        __skb_unlink(skb, &lro_mgr->lroq);
        cxgbit_queue_lro_skb(csk, skb);

        cxgbit_put_csk(csk);

        lro_mgr->lro_pkts++;
        lro_mgr->lro_session_cnt--;
}

static void cxgbit_uld_lro_flush(struct t4_lro_mgr *lro_mgr)
{
        struct sk_buff *skb;

        while ((skb = skb_peek(&lro_mgr->lroq)))
                cxgbit_lro_flush(lro_mgr, skb);
}

static int
cxgbit_lro_receive(struct cxgbit_sock *csk, u8 op, const __be64 *rsp,
                   const struct pkt_gl *gl, struct t4_lro_mgr *lro_mgr,
                   struct napi_struct *napi)
{
        struct sk_buff *skb;
        struct cxgbit_lro_cb *lro_cb;

        if (!csk) {
                pr_err("%s: csk NULL, op 0x%x.\n", __func__, op);
                goto out;
        }

        if (csk->lro_skb)
                goto add_packet;

start_lro:
        if (lro_mgr->lro_session_cnt >= MAX_LRO_SESSIONS) {
                cxgbit_uld_lro_flush(lro_mgr);
                goto start_lro;
        }

        skb = cxgbit_lro_init_skb(csk, op, gl, rsp, napi);
        if (unlikely(!skb))
                goto out;

        csk->lro_skb = skb;

        __skb_queue_tail(&lro_mgr->lroq, skb);
        lro_mgr->lro_session_cnt++;

add_packet:
        skb = csk->lro_skb;
        lro_cb = cxgbit_skb_lro_cb(skb);

        if ((gl && (((skb_shinfo(skb)->nr_frags + gl->nfrags) >
            MAX_SKB_FRAGS) || (lro_cb->pdu_totallen >= LRO_FLUSH_LEN_MAX))) ||
            (lro_cb->pdu_idx >= MAX_SKB_FRAGS)) {
                cxgbit_lro_flush(lro_mgr, skb);
                goto start_lro;
        }

        if (gl)
                cxgbit_lro_add_packet_gl(skb, op, gl);
        else
                cxgbit_lro_add_packet_rsp(skb, op, rsp);

        lro_mgr->lro_merged++;

        return 0;

out:
        return -1;
}

static int
cxgbit_uld_lro_rx_handler(void *hndl, const __be64 *rsp,
                          const struct pkt_gl *gl, struct t4_lro_mgr *lro_mgr,
                          struct napi_struct *napi)
{
        struct cxgbit_device *cdev = hndl;
        struct cxgb4_lld_info *lldi = &cdev->lldi;
        struct cpl_tx_data *rpl = NULL;
        struct cxgbit_sock *csk = NULL;
        unsigned int tid = 0;
        struct sk_buff *skb;
        unsigned int op = *(u8 *)rsp;
        bool lro_flush = true;

        switch (op) {
        case CPL_ISCSI_HDR:
        case CPL_ISCSI_DATA:
        case CPL_RX_ISCSI_CMP:
        case CPL_RX_ISCSI_DDP:
        case CPL_FW4_ACK:
                lro_flush = false;
                /* fall through */
        case CPL_ABORT_RPL_RSS:
        case CPL_PASS_ESTABLISH:
        case CPL_PEER_CLOSE:
        case CPL_CLOSE_CON_RPL:
        case CPL_ABORT_REQ_RSS:
        case CPL_SET_TCB_RPL:
        case CPL_RX_DATA:
                rpl = gl ? (struct cpl_tx_data *)gl->va :
                           (struct cpl_tx_data *)(rsp + 1);
                tid = GET_TID(rpl);
                csk = lookup_tid(lldi->tids, tid);
                break;
        default:
                break;
        }

        if (csk && csk->lro_skb && lro_flush)
                cxgbit_lro_flush(lro_mgr, csk->lro_skb);

        if (!gl) {
                unsigned int len;

                if (op == CPL_RX_ISCSI_DDP) {
                        if (!cxgbit_lro_receive(csk, op, rsp, NULL, lro_mgr,
                                                napi))
                                return 0;
                }

                len = 64 - sizeof(struct rsp_ctrl) - 8;
                skb = napi_alloc_skb(napi, len);
                if (!skb)
                        goto nomem;
                __skb_put(skb, len);
                skb_copy_to_linear_data(skb, &rsp[1], len);
        } else {
                if (unlikely(op != *(u8 *)gl->va)) {
                        pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
                                gl->va, be64_to_cpu(*rsp),
                                get_unaligned_be64(gl->va),
                                gl->tot_len);
                        return 0;
                }

                if ((op == CPL_ISCSI_HDR) || (op == CPL_ISCSI_DATA) ||
                    (op == CPL_RX_ISCSI_CMP)) {
                        if (!cxgbit_lro_receive(csk, op, rsp, gl, lro_mgr,
                                                napi))
                                return 0;
                }

#define RX_PULL_LEN 128
                skb = cxgb4_pktgl_to_skb(gl, RX_PULL_LEN, RX_PULL_LEN);
                if (unlikely(!skb))
                        goto nomem;
        }

        rpl = (struct cpl_tx_data *)skb->data;
        op = rpl->ot.opcode;
        cxgbit_skcb_rx_opcode(skb) = op;

        pr_debug("cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
                 cdev, op, rpl->ot.opcode_tid,
                 ntohl(rpl->ot.opcode_tid), skb);

        if (op < NUM_CPL_CMDS && cxgbit_cplhandlers[op]) {
                cxgbit_cplhandlers[op](cdev, skb);
        } else {
                pr_err("No handler for opcode 0x%x.\n", op);
                __kfree_skb(skb);
        }
        return 0;
nomem:
        pr_err("%s OOM bailing out.\n", __func__);
        return 1;
}

#ifdef CONFIG_CHELSIO_T4_DCB
struct cxgbit_dcb_work {
        struct dcb_app_type dcb_app;
        struct work_struct work;
};

static void
cxgbit_update_dcb_priority(struct cxgbit_device *cdev, u8 port_id,
                           u8 dcb_priority, u16 port_num)
{
        struct cxgbit_sock *csk;
        struct sk_buff *skb;
        u16 local_port;
        bool wakeup_thread = false;

        spin_lock_bh(&cdev->cskq.lock);
        list_for_each_entry(csk, &cdev->cskq.list, list) {
                if (csk->port_id != port_id)
                        continue;

                if (csk->com.local_addr.ss_family == AF_INET6) {
                        struct sockaddr_in6 *sock_in6;

                        sock_in6 = (struct sockaddr_in6 *)&csk->com.local_addr;
                        local_port = ntohs(sock_in6->sin6_port);
                } else {
                        struct sockaddr_in *sock_in;

                        sock_in = (struct sockaddr_in *)&csk->com.local_addr;
                        local_port = ntohs(sock_in->sin_port);
                }

                if (local_port != port_num)
                        continue;

                if (csk->dcb_priority == dcb_priority)
                        continue;

                skb = alloc_skb(0, GFP_ATOMIC);
                if (!skb)
                        continue;

                spin_lock(&csk->rxq.lock);
                __skb_queue_tail(&csk->rxq, skb);
                if (skb_queue_len(&csk->rxq) == 1)
                        wakeup_thread = true;
                spin_unlock(&csk->rxq.lock);

                if (wakeup_thread) {
                        wake_up(&csk->waitq);
                        wakeup_thread = false;
                }
        }
        spin_unlock_bh(&cdev->cskq.lock);
}

static void cxgbit_dcb_workfn(struct work_struct *work)
{
        struct cxgbit_dcb_work *dcb_work;
        struct net_device *ndev;
        struct cxgbit_device *cdev = NULL;
        struct dcb_app_type *iscsi_app;
        u8 priority, port_id = 0xff;

        dcb_work = container_of(work, struct cxgbit_dcb_work, work);
        iscsi_app = &dcb_work->dcb_app;

        if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_IEEE) {
                if (iscsi_app->app.selector != IEEE_8021QAZ_APP_SEL_ANY)
                        goto out;

                priority = iscsi_app->app.priority;

        } else if (iscsi_app->dcbx & DCB_CAP_DCBX_VER_CEE) {
                if (iscsi_app->app.selector != DCB_APP_IDTYPE_PORTNUM)
                        goto out;

                if (!iscsi_app->app.priority)
                        goto out;

                priority = ffs(iscsi_app->app.priority) - 1;
        } else {
                goto out;
        }

        pr_debug("priority for ifid %d is %u\n",
                 iscsi_app->ifindex, priority);

        ndev = dev_get_by_index(&init_net, iscsi_app->ifindex);

        if (!ndev)
                goto out;

        mutex_lock(&cdev_list_lock);
        cdev = cxgbit_find_device(ndev, &port_id);

        dev_put(ndev);

        if (!cdev) {
                mutex_unlock(&cdev_list_lock);
                goto out;
        }

        cxgbit_update_dcb_priority(cdev, port_id, priority,
                                   iscsi_app->app.protocol);
        mutex_unlock(&cdev_list_lock);
out:
        kfree(dcb_work);
}

static int
cxgbit_dcbevent_notify(struct notifier_block *nb, unsigned long action,
                       void *data)
{
        struct cxgbit_dcb_work *dcb_work;
        struct dcb_app_type *dcb_app = data;

        dcb_work = kzalloc(sizeof(*dcb_work), GFP_ATOMIC);
        if (!dcb_work)
                return NOTIFY_DONE;

        dcb_work->dcb_app = *dcb_app;
        INIT_WORK(&dcb_work->work, cxgbit_dcb_workfn);
        schedule_work(&dcb_work->work);
        return NOTIFY_OK;
}
#endif

static enum target_prot_op cxgbit_get_sup_prot_ops(struct iscsi_conn *conn)
{
        return TARGET_PROT_NORMAL;
}

static struct iscsit_transport cxgbit_transport = {
        .name                   = DRV_NAME,
        .transport_type         = ISCSI_CXGBIT,
        .rdma_shutdown          = false,
        .priv_size              = sizeof(struct cxgbit_cmd),
        .owner                  = THIS_MODULE,
        .iscsit_setup_np        = cxgbit_setup_np,
        .iscsit_accept_np       = cxgbit_accept_np,
        .iscsit_free_np         = cxgbit_free_np,
        .iscsit_free_conn       = cxgbit_free_conn,
        .iscsit_get_login_rx    = cxgbit_get_login_rx,
        .iscsit_put_login_tx    = cxgbit_put_login_tx,
        .iscsit_immediate_queue = iscsit_immediate_queue,
        .iscsit_response_queue  = iscsit_response_queue,
        .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
        .iscsit_queue_data_in   = iscsit_queue_rsp,
        .iscsit_queue_status    = iscsit_queue_rsp,
        .iscsit_xmit_pdu        = cxgbit_xmit_pdu,
        .iscsit_get_r2t_ttt     = cxgbit_get_r2t_ttt,
        .iscsit_get_rx_pdu      = cxgbit_get_rx_pdu,
        .iscsit_validate_params = cxgbit_validate_params,
        .iscsit_release_cmd     = cxgbit_release_cmd,
        .iscsit_aborted_task    = iscsit_aborted_task,
        .iscsit_get_sup_prot_ops = cxgbit_get_sup_prot_ops,
};

static struct cxgb4_uld_info cxgbit_uld_info = {
        .name           = DRV_NAME,
        .nrxq           = MAX_ULD_QSETS,
        .ntxq           = MAX_ULD_QSETS,
        .rxq_size       = 1024,
        .lro            = true,
        .add            = cxgbit_uld_add,
        .state_change   = cxgbit_uld_state_change,
        .lro_rx_handler = cxgbit_uld_lro_rx_handler,
        .lro_flush      = cxgbit_uld_lro_flush,
};

#ifdef CONFIG_CHELSIO_T4_DCB
static struct notifier_block cxgbit_dcbevent_nb = {
        .notifier_call = cxgbit_dcbevent_notify,
};
#endif

static int __init cxgbit_init(void)
{
        cxgb4_register_uld(CXGB4_ULD_ISCSIT, &cxgbit_uld_info);
        iscsit_register_transport(&cxgbit_transport);

#ifdef CONFIG_CHELSIO_T4_DCB
        pr_info("%s dcb enabled.\n", DRV_NAME);
        register_dcbevent_notifier(&cxgbit_dcbevent_nb);
#endif
        BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, cb) <
                     sizeof(union cxgbit_skb_cb));
        return 0;
}

static void __exit cxgbit_exit(void)
{
        struct cxgbit_device *cdev, *tmp;

#ifdef CONFIG_CHELSIO_T4_DCB
        unregister_dcbevent_notifier(&cxgbit_dcbevent_nb);
#endif
        mutex_lock(&cdev_list_lock);
        list_for_each_entry_safe(cdev, tmp, &cdev_list_head, list) {
                list_del(&cdev->list);
                cxgbit_put_cdev(cdev);
        }
        mutex_unlock(&cdev_list_lock);
        iscsit_unregister_transport(&cxgbit_transport);
        cxgb4_unregister_uld(CXGB4_ULD_ISCSIT);
}

module_init(cxgbit_init);
module_exit(cxgbit_exit);

MODULE_DESCRIPTION("Chelsio iSCSI target offload driver");
MODULE_AUTHOR("Chelsio Communications");
MODULE_VERSION(DRV_VERSION);
MODULE_LICENSE("GPL");