Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma

[mirror_ubuntu-bionic-kernel.git] / drivers / net / ethernet / chelsio / cxgb4 / cxgb4_uld.c

/*
 * cxgb4_uld.c:Chelsio Upper Layer Driver Interface for T4/T5/T6 SGE management
 *
 * Copyright (c) 2016 Chelsio Communications, Inc. All rights reserved.
 *
 * 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.
 *
 *  Written by: Atul Gupta (atul.gupta@chelsio.com)
 *  Written by: Hariprasad Shenai (hariprasad@chelsio.com)
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/debugfs.h>
#include <linux/export.h>
#include <linux/list.h>
#include <linux/skbuff.h>
#include <linux/pci.h>

#include "cxgb4.h"
#include "cxgb4_uld.h"
#include "t4_regs.h"
#include "t4fw_api.h"
#include "t4_msg.h"

#define for_each_uldrxq(m, i) for (i = 0; i < ((m)->nrxq + (m)->nciq); i++)

static int get_msix_idx_from_bmap(struct adapter *adap)
{
        struct uld_msix_bmap *bmap = &adap->msix_bmap_ulds;
        unsigned long flags;
        unsigned int msix_idx;

        spin_lock_irqsave(&bmap->lock, flags);
        msix_idx = find_first_zero_bit(bmap->msix_bmap, bmap->mapsize);
        if (msix_idx < bmap->mapsize) {
                __set_bit(msix_idx, bmap->msix_bmap);
        } else {
                spin_unlock_irqrestore(&bmap->lock, flags);
                return -ENOSPC;
        }

        spin_unlock_irqrestore(&bmap->lock, flags);
        return msix_idx;
}

static void free_msix_idx_in_bmap(struct adapter *adap, unsigned int msix_idx)
{
        struct uld_msix_bmap *bmap = &adap->msix_bmap_ulds;
        unsigned long flags;

        spin_lock_irqsave(&bmap->lock, flags);
         __clear_bit(msix_idx, bmap->msix_bmap);
        spin_unlock_irqrestore(&bmap->lock, flags);
}

/* Flush the aggregated lro sessions */
static void uldrx_flush_handler(struct sge_rspq *q)
{
        struct adapter *adap = q->adap;

        if (adap->uld[q->uld].lro_flush)
                adap->uld[q->uld].lro_flush(&q->lro_mgr);
}

/**
 *      uldrx_handler - response queue handler for ULD queues
 *      @q: the response queue that received the packet
 *      @rsp: the response queue descriptor holding the offload message
 *      @gl: the gather list of packet fragments
 *
 *      Deliver an ingress offload packet to a ULD.  All processing is done by
 *      the ULD, we just maintain statistics.
 */
static int uldrx_handler(struct sge_rspq *q, const __be64 *rsp,
                         const struct pkt_gl *gl)
{
        struct adapter *adap = q->adap;
        struct sge_ofld_rxq *rxq = container_of(q, struct sge_ofld_rxq, rspq);
        int ret;

        /* FW can send CPLs encapsulated in a CPL_FW4_MSG */
        if (((const struct rss_header *)rsp)->opcode == CPL_FW4_MSG &&
            ((const struct cpl_fw4_msg *)(rsp + 1))->type == FW_TYPE_RSSCPL)
                rsp += 2;

        if (q->flush_handler)
                ret = adap->uld[q->uld].lro_rx_handler(adap->uld[q->uld].handle,
                                rsp, gl, &q->lro_mgr,
                                &q->napi);
        else
                ret = adap->uld[q->uld].rx_handler(adap->uld[q->uld].handle,
                                rsp, gl);

        if (ret) {
                rxq->stats.nomem++;
                return -1;
        }

        if (!gl)
                rxq->stats.imm++;
        else if (gl == CXGB4_MSG_AN)
                rxq->stats.an++;
        else
                rxq->stats.pkts++;
        return 0;
}

static int alloc_uld_rxqs(struct adapter *adap,
                          struct sge_uld_rxq_info *rxq_info,
                          unsigned int nq, unsigned int offset, bool lro)
{
        struct sge *s = &adap->sge;
        struct sge_ofld_rxq *q = rxq_info->uldrxq + offset;
        unsigned short *ids = rxq_info->rspq_id + offset;
        unsigned int per_chan = nq / adap->params.nports;
        unsigned int bmap_idx = 0;
        int i, err, msi_idx;

        if (adap->flags & USING_MSIX)
                msi_idx = 1;
        else
                msi_idx = -((int)s->intrq.abs_id + 1);

        for (i = 0; i < nq; i++, q++) {
                if (msi_idx >= 0) {
                        bmap_idx = get_msix_idx_from_bmap(adap);
                        msi_idx = adap->msix_info_ulds[bmap_idx].idx;
                }
                err = t4_sge_alloc_rxq(adap, &q->rspq, false,
                                       adap->port[i / per_chan],
                                       msi_idx,
                                       q->fl.size ? &q->fl : NULL,
                                       uldrx_handler,
                                       lro ? uldrx_flush_handler : NULL,
                                       0);
                if (err)
                        goto freeout;
                if (msi_idx >= 0)
                        rxq_info->msix_tbl[i + offset] = bmap_idx;
                memset(&q->stats, 0, sizeof(q->stats));
                if (ids)
                        ids[i] = q->rspq.abs_id;
        }
        return 0;
freeout:
        q = rxq_info->uldrxq + offset;
        for ( ; i; i--, q++) {
                if (q->rspq.desc)
                        free_rspq_fl(adap, &q->rspq,
                                     q->fl.size ? &q->fl : NULL);
        }

        /* We need to free rxq also in case of ciq allocation failure */
        if (offset) {
                q = rxq_info->uldrxq + offset;
                for ( ; i; i--, q++) {
                        if (q->rspq.desc)
                                free_rspq_fl(adap, &q->rspq,
                                             q->fl.size ? &q->fl : NULL);
                }
        }
        return err;
}

static int
setup_sge_queues_uld(struct adapter *adap, unsigned int uld_type, bool lro)
{
        struct sge_uld_rxq_info *rxq_info = adap->sge.uld_rxq_info[uld_type];
        int i, ret = 0;

        if (adap->flags & USING_MSIX) {
                rxq_info->msix_tbl = kcalloc((rxq_info->nrxq + rxq_info->nciq),
                                             sizeof(unsigned short),
                                             GFP_KERNEL);
                if (!rxq_info->msix_tbl)
                        return -ENOMEM;
        }

        ret = !(!alloc_uld_rxqs(adap, rxq_info, rxq_info->nrxq, 0, lro) &&
                 !alloc_uld_rxqs(adap, rxq_info, rxq_info->nciq,
                                 rxq_info->nrxq, lro));

        /* Tell uP to route control queue completions to rdma rspq */
        if (adap->flags & FULL_INIT_DONE &&
            !ret && uld_type == CXGB4_ULD_RDMA) {
                struct sge *s = &adap->sge;
                unsigned int cmplqid;
                u32 param, cmdop;

                cmdop = FW_PARAMS_PARAM_DMAQ_EQ_CMPLIQID_CTRL;
                for_each_port(adap, i) {
                        cmplqid = rxq_info->uldrxq[i].rspq.cntxt_id;
                        param = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DMAQ) |
                                 FW_PARAMS_PARAM_X_V(cmdop) |
                                 FW_PARAMS_PARAM_YZ_V(s->ctrlq[i].q.cntxt_id));
                        ret = t4_set_params(adap, adap->mbox, adap->pf,
                                            0, 1, &param, &cmplqid);
                }
        }
        return ret;
}

static void t4_free_uld_rxqs(struct adapter *adap, int n,
                             struct sge_ofld_rxq *q)
{
        for ( ; n; n--, q++) {
                if (q->rspq.desc)
                        free_rspq_fl(adap, &q->rspq,
                                     q->fl.size ? &q->fl : NULL);
        }
}

static void free_sge_queues_uld(struct adapter *adap, unsigned int uld_type)
{
        struct sge_uld_rxq_info *rxq_info = adap->sge.uld_rxq_info[uld_type];

        if (adap->flags & FULL_INIT_DONE && uld_type == CXGB4_ULD_RDMA) {
                struct sge *s = &adap->sge;
                u32 param, cmdop, cmplqid = 0;
                int i;

                cmdop = FW_PARAMS_PARAM_DMAQ_EQ_CMPLIQID_CTRL;
                for_each_port(adap, i) {
                        param = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DMAQ) |
                                 FW_PARAMS_PARAM_X_V(cmdop) |
                                 FW_PARAMS_PARAM_YZ_V(s->ctrlq[i].q.cntxt_id));
                        t4_set_params(adap, adap->mbox, adap->pf,
                                      0, 1, &param, &cmplqid);
                }
        }

        if (rxq_info->nciq)
                t4_free_uld_rxqs(adap, rxq_info->nciq,
                                 rxq_info->uldrxq + rxq_info->nrxq);
        t4_free_uld_rxqs(adap, rxq_info->nrxq, rxq_info->uldrxq);
        if (adap->flags & USING_MSIX)
                kfree(rxq_info->msix_tbl);
}

static int cfg_queues_uld(struct adapter *adap, unsigned int uld_type,
                          const struct cxgb4_uld_info *uld_info)
{
        struct sge *s = &adap->sge;
        struct sge_uld_rxq_info *rxq_info;
        int i, nrxq, ciq_size;

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

        if (adap->flags & USING_MSIX && uld_info->nrxq > s->nqs_per_uld) {
                i = s->nqs_per_uld;
                rxq_info->nrxq = roundup(i, adap->params.nports);
        } else {
                i = min_t(int, uld_info->nrxq,
                          num_online_cpus());
                rxq_info->nrxq = roundup(i, adap->params.nports);
        }
        if (!uld_info->ciq) {
                rxq_info->nciq = 0;
        } else  {
                if (adap->flags & USING_MSIX)
                        rxq_info->nciq = min_t(int, s->nqs_per_uld,
                                               num_online_cpus());
                else
                        rxq_info->nciq = min_t(int, MAX_OFLD_QSETS,
                                               num_online_cpus());
                rxq_info->nciq = ((rxq_info->nciq / adap->params.nports) *
                                  adap->params.nports);
                rxq_info->nciq = max_t(int, rxq_info->nciq,
                                       adap->params.nports);
        }

        nrxq = rxq_info->nrxq + rxq_info->nciq; /* total rxq's */
        rxq_info->uldrxq = kcalloc(nrxq, sizeof(struct sge_ofld_rxq),
                                   GFP_KERNEL);
        if (!rxq_info->uldrxq) {
                kfree(rxq_info);
                return -ENOMEM;
        }

        rxq_info->rspq_id = kcalloc(nrxq, sizeof(unsigned short), GFP_KERNEL);
        if (!rxq_info->rspq_id) {
                kfree(rxq_info->uldrxq);
                kfree(rxq_info);
                return -ENOMEM;
        }

        for (i = 0; i < rxq_info->nrxq; i++) {
                struct sge_ofld_rxq *r = &rxq_info->uldrxq[i];

                init_rspq(adap, &r->rspq, 5, 1, uld_info->rxq_size, 64);
                r->rspq.uld = uld_type;
                r->fl.size = 72;
        }

        ciq_size = 64 + adap->vres.cq.size + adap->tids.nftids;
        if (ciq_size > SGE_MAX_IQ_SIZE) {
                dev_warn(adap->pdev_dev, "CIQ size too small for available IQs\n");
                ciq_size = SGE_MAX_IQ_SIZE;
        }

        for (i = rxq_info->nrxq; i < nrxq; i++) {
                struct sge_ofld_rxq *r = &rxq_info->uldrxq[i];

                init_rspq(adap, &r->rspq, 5, 1, ciq_size, 64);
                r->rspq.uld = uld_type;
        }

        memcpy(rxq_info->name, uld_info->name, IFNAMSIZ);
        adap->sge.uld_rxq_info[uld_type] = rxq_info;

        return 0;
}

static void free_queues_uld(struct adapter *adap, unsigned int uld_type)
{
        struct sge_uld_rxq_info *rxq_info = adap->sge.uld_rxq_info[uld_type];

        kfree(rxq_info->rspq_id);
        kfree(rxq_info->uldrxq);
        kfree(rxq_info);
}

static int
request_msix_queue_irqs_uld(struct adapter *adap, unsigned int uld_type)
{
        struct sge_uld_rxq_info *rxq_info = adap->sge.uld_rxq_info[uld_type];
        int err = 0;
        unsigned int idx, bmap_idx;

        for_each_uldrxq(rxq_info, idx) {
                bmap_idx = rxq_info->msix_tbl[idx];
                err = request_irq(adap->msix_info_ulds[bmap_idx].vec,
                                  t4_sge_intr_msix, 0,
                                  adap->msix_info_ulds[bmap_idx].desc,
                                  &rxq_info->uldrxq[idx].rspq);
                if (err)
                        goto unwind;
        }
        return 0;
unwind:
        while (idx-- > 0) {
                bmap_idx = rxq_info->msix_tbl[idx];
                free_msix_idx_in_bmap(adap, bmap_idx);
                free_irq(adap->msix_info_ulds[bmap_idx].vec,
                         &rxq_info->uldrxq[idx].rspq);
        }
        return err;
}

static void
free_msix_queue_irqs_uld(struct adapter *adap, unsigned int uld_type)
{
        struct sge_uld_rxq_info *rxq_info = adap->sge.uld_rxq_info[uld_type];
        unsigned int idx, bmap_idx;

        for_each_uldrxq(rxq_info, idx) {
                bmap_idx = rxq_info->msix_tbl[idx];

                free_msix_idx_in_bmap(adap, bmap_idx);
                free_irq(adap->msix_info_ulds[bmap_idx].vec,
                         &rxq_info->uldrxq[idx].rspq);
        }
}

static void name_msix_vecs_uld(struct adapter *adap, unsigned int uld_type)
{
        struct sge_uld_rxq_info *rxq_info = adap->sge.uld_rxq_info[uld_type];
        int n = sizeof(adap->msix_info_ulds[0].desc);
        unsigned int idx, bmap_idx;

        for_each_uldrxq(rxq_info, idx) {
                bmap_idx = rxq_info->msix_tbl[idx];

                snprintf(adap->msix_info_ulds[bmap_idx].desc, n, "%s-%s%d",
                         adap->port[0]->name, rxq_info->name, idx);
        }
}

static void enable_rx(struct adapter *adap, struct sge_rspq *q)
{
        if (!q)
                return;

        if (q->handler) {
                cxgb_busy_poll_init_lock(q);
                napi_enable(&q->napi);
        }
        /* 0-increment GTS to start the timer and enable interrupts */
        t4_write_reg(adap, MYPF_REG(SGE_PF_GTS_A),
                     SEINTARM_V(q->intr_params) |
                     INGRESSQID_V(q->cntxt_id));
}

static void quiesce_rx(struct adapter *adap, struct sge_rspq *q)
{
        if (q && q->handler) {
                napi_disable(&q->napi);
                local_bh_disable();
                while (!cxgb_poll_lock_napi(q))
                        mdelay(1);
                local_bh_enable();
        }
}

static void enable_rx_uld(struct adapter *adap, unsigned int uld_type)
{
        struct sge_uld_rxq_info *rxq_info = adap->sge.uld_rxq_info[uld_type];
        int idx;

        for_each_uldrxq(rxq_info, idx)
                enable_rx(adap, &rxq_info->uldrxq[idx].rspq);
}

static void quiesce_rx_uld(struct adapter *adap, unsigned int uld_type)
{
        struct sge_uld_rxq_info *rxq_info = adap->sge.uld_rxq_info[uld_type];
        int idx;

        for_each_uldrxq(rxq_info, idx)
                quiesce_rx(adap, &rxq_info->uldrxq[idx].rspq);
}

static void uld_queue_init(struct adapter *adap, unsigned int uld_type,
                           struct cxgb4_lld_info *lli)
{
        struct sge_uld_rxq_info *rxq_info = adap->sge.uld_rxq_info[uld_type];

        lli->rxq_ids = rxq_info->rspq_id;
        lli->nrxq = rxq_info->nrxq;
        lli->ciq_ids = rxq_info->rspq_id + rxq_info->nrxq;
        lli->nciq = rxq_info->nciq;
}

int t4_uld_mem_alloc(struct adapter *adap)
{
        struct sge *s = &adap->sge;

        adap->uld = kcalloc(CXGB4_ULD_MAX, sizeof(*adap->uld), GFP_KERNEL);
        if (!adap->uld)
                return -ENOMEM;

        s->uld_rxq_info = kzalloc(CXGB4_ULD_MAX *
                                  sizeof(struct sge_uld_rxq_info *),
                                  GFP_KERNEL);
        if (!s->uld_rxq_info)
                goto err_uld;

        return 0;
err_uld:
        kfree(adap->uld);
        return -ENOMEM;
}

void t4_uld_mem_free(struct adapter *adap)
{
        struct sge *s = &adap->sge;

        kfree(s->uld_rxq_info);
        kfree(adap->uld);
}

void t4_uld_clean_up(struct adapter *adap)
{
        struct sge_uld_rxq_info *rxq_info;
        unsigned int i;

        if (!adap->uld)
                return;
        for (i = 0; i < CXGB4_ULD_MAX; i++) {
                if (!adap->uld[i].handle)
                        continue;
                rxq_info = adap->sge.uld_rxq_info[i];
                if (adap->flags & FULL_INIT_DONE)
                        quiesce_rx_uld(adap, i);
                if (adap->flags & USING_MSIX)
                        free_msix_queue_irqs_uld(adap, i);
                free_sge_queues_uld(adap, i);
                free_queues_uld(adap, i);
        }
}

static void uld_init(struct adapter *adap, struct cxgb4_lld_info *lld)
{
        int i;

        lld->pdev = adap->pdev;
        lld->pf = adap->pf;
        lld->l2t = adap->l2t;
        lld->tids = &adap->tids;
        lld->ports = adap->port;
        lld->vr = &adap->vres;
        lld->mtus = adap->params.mtus;
        lld->ntxq = adap->sge.ofldqsets;
        lld->nchan = adap->params.nports;
        lld->nports = adap->params.nports;
        lld->wr_cred = adap->params.ofldq_wr_cred;
        lld->iscsi_iolen = MAXRXDATA_G(t4_read_reg(adap, TP_PARA_REG2_A));
        lld->iscsi_tagmask = t4_read_reg(adap, ULP_RX_ISCSI_TAGMASK_A);
        lld->iscsi_pgsz_order = t4_read_reg(adap, ULP_RX_ISCSI_PSZ_A);
        lld->iscsi_llimit = t4_read_reg(adap, ULP_RX_ISCSI_LLIMIT_A);
        lld->iscsi_ppm = &adap->iscsi_ppm;
        lld->adapter_type = adap->params.chip;
        lld->cclk_ps = 1000000000 / adap->params.vpd.cclk;
        lld->udb_density = 1 << adap->params.sge.eq_qpp;
        lld->ucq_density = 1 << adap->params.sge.iq_qpp;
        lld->filt_mode = adap->params.tp.vlan_pri_map;
        /* MODQ_REQ_MAP sets queues 0-3 to chan 0-3 */
        for (i = 0; i < NCHAN; i++)
                lld->tx_modq[i] = i;
        lld->gts_reg = adap->regs + MYPF_REG(SGE_PF_GTS_A);
        lld->db_reg = adap->regs + MYPF_REG(SGE_PF_KDOORBELL_A);
        lld->fw_vers = adap->params.fw_vers;
        lld->dbfifo_int_thresh = dbfifo_int_thresh;
        lld->sge_ingpadboundary = adap->sge.fl_align;
        lld->sge_egrstatuspagesize = adap->sge.stat_len;
        lld->sge_pktshift = adap->sge.pktshift;
        lld->enable_fw_ofld_conn = adap->flags & FW_OFLD_CONN;
        lld->max_ordird_qp = adap->params.max_ordird_qp;
        lld->max_ird_adapter = adap->params.max_ird_adapter;
        lld->ulptx_memwrite_dsgl = adap->params.ulptx_memwrite_dsgl;
        lld->nodeid = dev_to_node(adap->pdev_dev);
        lld->fr_nsmr_tpte_wr_support = adap->params.fr_nsmr_tpte_wr_support;
}

static void uld_attach(struct adapter *adap, unsigned int uld)
{
        void *handle;
        struct cxgb4_lld_info lli;

        uld_init(adap, &lli);
        uld_queue_init(adap, uld, &lli);

        handle = adap->uld[uld].add(&lli);
        if (IS_ERR(handle)) {
                dev_warn(adap->pdev_dev,
                         "could not attach to the %s driver, error %ld\n",
                         adap->uld[uld].name, PTR_ERR(handle));
                return;
        }

        adap->uld[uld].handle = handle;
        t4_register_netevent_notifier();

        if (adap->flags & FULL_INIT_DONE)
                adap->uld[uld].state_change(handle, CXGB4_STATE_UP);
}

/**
 *      cxgb4_register_uld - register an upper-layer driver
 *      @type: the ULD type
 *      @p: the ULD methods
 *
 *      Registers an upper-layer driver with this driver and notifies the ULD
 *      about any presently available devices that support its type.  Returns
 *      %-EBUSY if a ULD of the same type is already registered.
 */
int cxgb4_register_uld(enum cxgb4_uld type,
                       const struct cxgb4_uld_info *p)
{
        int ret = 0;
        unsigned int adap_idx = 0;
        struct adapter *adap;

        if (type >= CXGB4_ULD_MAX)
                return -EINVAL;

        mutex_lock(&uld_mutex);
        list_for_each_entry(adap, &adapter_list, list_node) {
                if ((type == CXGB4_ULD_CRYPTO && !is_pci_uld(adap)) ||
                    (type != CXGB4_ULD_CRYPTO && !is_offload(adap)))
                        continue;
                if (type == CXGB4_ULD_ISCSIT && is_t4(adap->params.chip))
                        continue;
                ret = cfg_queues_uld(adap, type, p);
                if (ret)
                        goto out;
                ret = setup_sge_queues_uld(adap, type, p->lro);
                if (ret)
                        goto free_queues;
                if (adap->flags & USING_MSIX) {
                        name_msix_vecs_uld(adap, type);
                        ret = request_msix_queue_irqs_uld(adap, type);
                        if (ret)
                                goto free_rxq;
                }
                if (adap->flags & FULL_INIT_DONE)
                        enable_rx_uld(adap, type);
                if (adap->uld[type].add) {
                        ret = -EBUSY;
                        goto free_irq;
                }
                adap->uld[type] = *p;
                uld_attach(adap, type);
                adap_idx++;
        }
        mutex_unlock(&uld_mutex);
        return 0;

free_irq:
        if (adap->flags & FULL_INIT_DONE)
                quiesce_rx_uld(adap, type);
        if (adap->flags & USING_MSIX)
                free_msix_queue_irqs_uld(adap, type);
free_rxq:
        free_sge_queues_uld(adap, type);
free_queues:
        free_queues_uld(adap, type);
out:

        list_for_each_entry(adap, &adapter_list, list_node) {
                if ((type == CXGB4_ULD_CRYPTO && !is_pci_uld(adap)) ||
                    (type != CXGB4_ULD_CRYPTO && !is_offload(adap)))
                        continue;
                if (type == CXGB4_ULD_ISCSIT && is_t4(adap->params.chip))
                        continue;
                if (!adap_idx)
                        break;
                adap->uld[type].handle = NULL;
                adap->uld[type].add = NULL;
                if (adap->flags & FULL_INIT_DONE)
                        quiesce_rx_uld(adap, type);
                if (adap->flags & USING_MSIX)
                        free_msix_queue_irqs_uld(adap, type);
                free_sge_queues_uld(adap, type);
                free_queues_uld(adap, type);
                adap_idx--;
        }
        mutex_unlock(&uld_mutex);
        return ret;
}
EXPORT_SYMBOL(cxgb4_register_uld);

/**
 *      cxgb4_unregister_uld - unregister an upper-layer driver
 *      @type: the ULD type
 *
 *      Unregisters an existing upper-layer driver.
 */
int cxgb4_unregister_uld(enum cxgb4_uld type)
{
        struct adapter *adap;

        if (type >= CXGB4_ULD_MAX)
                return -EINVAL;

        mutex_lock(&uld_mutex);
        list_for_each_entry(adap, &adapter_list, list_node) {
                if ((type == CXGB4_ULD_CRYPTO && !is_pci_uld(adap)) ||
                    (type != CXGB4_ULD_CRYPTO && !is_offload(adap)))
                        continue;
                if (type == CXGB4_ULD_ISCSIT && is_t4(adap->params.chip))
                        continue;
                adap->uld[type].handle = NULL;
                adap->uld[type].add = NULL;
                if (adap->flags & FULL_INIT_DONE)
                        quiesce_rx_uld(adap, type);
                if (adap->flags & USING_MSIX)
                        free_msix_queue_irqs_uld(adap, type);
                free_sge_queues_uld(adap, type);
                free_queues_uld(adap, type);
        }
        mutex_unlock(&uld_mutex);

        return 0;
}
EXPORT_SYMBOL(cxgb4_unregister_uld);