sw_onwire_fom.c

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/* -*- C -*- */
/*
 * Copyright (c) 2013-2020 Seagate Technology LLC and/or its Affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * For any questions about this software or licensing,
 * please email opensource@seagate.com or cortx-questions@seagate.com.
 *
 */


#define M0_TRACE_SUBSYSTEM M0_TRACE_SUBSYS_CM
#include "lib/trace.h"
#include "lib/errno.h"
#include "lib/assert.h"
#include "lib/memory.h"
#include "lib/arith.h"           /* m0_rnd() */

#include "rpc/rpc.h"

#include "fop/fop.h"
#include "fop/fop_item_type.h"
#include "fop/fom.h"

#include "cm/proxy.h"
#include "cm/cm.h"
#include "cm/repreb/sw_onwire_fop.h"
#include "cm/repreb/sw_onwire_fom.h"

static struct m0_sm_state_descr repreb_sw_fom_phases[] = {
        [SWOPH_START] = {
                .sd_flags     = M0_SDF_INITIAL,
                .sd_name      = "Start",
                .sd_allowed   = M0_BITS(SWOPH_FINI)
        },
        [SWOPH_FINI] = {
                .sd_flags     = M0_SDF_TERMINAL,
                .sd_name      = "Fini",
                .sd_allowed   = 0
        },
};

const struct m0_sm_conf m0_cm_repreb_sw_onwire_conf = {
        .scf_name      = "Repair/re-balance sw update",
        .scf_nr_states = ARRAY_SIZE(repreb_sw_fom_phases),
        .scf_state     = repreb_sw_fom_phases
};

static int repreb_sw_fom_tick(struct m0_fom *fom)
{
        struct m0_reqh_service     *service;
        struct m0_cm               *cm;
        struct m0_cm_sw_onwire     *swo_fop;
        struct m0_cm_sw_onwire_rep *swo_rep;
        struct m0_cm_proxy         *cm_proxy;
        struct m0_fop              *rfop;
        int                         rc = 0;
        const char                 *ep;

        service = fom->fo_service;
        switch (m0_fom_phase(fom)) {
        case SWOPH_START:
                swo_fop = m0_fop_data(fom->fo_fop);
                cm = m0_cmsvc2cm(service);
                if (cm == NULL)
                        return M0_ERR(-EINVAL);
                M0_LOG(M0_DEBUG, "Rcvd from %s hi: "M0_AG_F
                                 " [%" PRIu64 "] [%" PRIu64 "] [%" PRIu64 "]",
                       swo_fop->swo_cm_ep.ep,
                       M0_AG_P(&swo_fop->swo_in_interval.sw_hi),
                       cm->cm_aggr_grps_in_nr,
                       cm->cm_aggr_grps_out_nr,
                       cm->cm_proxy_nr);

                ep = swo_fop->swo_cm_ep.ep;
                m0_cm_lock(cm);
                cm_proxy = m0_cm_proxy_locate(cm, ep);
                if (cm_proxy != NULL) {
                        ID_LOG("proxy hi", &cm_proxy->px_sw.sw_hi);
                        rc = m0_cm_proxy_update(cm_proxy,
                                                &swo_fop->swo_in_interval,
                                                &swo_fop->swo_out_interval,
                                                swo_fop->swo_cm_status,
                                                swo_fop->swo_cm_epoch);
                } else
                        rc = -ENOENT;
                m0_cm_unlock(cm);

                rfop = fom->fo_rep_fop;
                swo_rep = m0_fop_data(rfop);
                swo_rep->swr_rc = rc;
                m0_rpc_reply_post(&fom->fo_fop->f_item, &rfop->f_item);
                m0_fom_phase_set(fom, SWOPH_FINI);
                break;
        default:
                M0_IMPOSSIBLE("Invalid fop");
                return M0_ERR(-EINVAL);
        }
        return M0_FSO_WAIT;
}

static void repreb_sw_fom_fini(struct m0_fom *fom)
{
        M0_PRE(fom != NULL);

        m0_fom_fini(fom);
        m0_free(fom);
}

static size_t repreb_sw_fom_home_locality(const struct m0_fom *fom)
{
        struct m0_cm_sw_onwire *swo_fop;

        swo_fop = m0_fop_data(fom->fo_fop);
        return m0_rnd(1 << 30, &swo_fop->swo_sender_id);
}

static const struct m0_fom_ops repreb_sw_fom_ops = {
        .fo_fini          = repreb_sw_fom_fini,
        .fo_tick          = repreb_sw_fom_tick,
        .fo_home_locality = repreb_sw_fom_home_locality,
};

M0_INTERNAL int m0_cm_repreb_sw_onwire_fom_create(struct m0_fop *fop,
                                                  struct m0_fop *r_fop,
                                                  struct m0_fom **out,
                                                  struct m0_reqh *reqh)
{
        struct m0_fom *fom;

        M0_PRE(fop != NULL);
        M0_PRE(out != NULL);

        M0_ALLOC_PTR(fom);
        if (fom == NULL)
                return M0_ERR(-ENOMEM);

        m0_fom_init(fom, &fop->f_type->ft_fom_type, &repreb_sw_fom_ops, fop,
                    r_fop, reqh);

        *out = fom;
        return 0;
}

#undef M0_TRACE_SUBSYSTEM

/*
 *  Local variables:
 *  c-indentation-style: "K&R"
 *  c-basic-offset: 8
 *  tab-width: 8
 *  fill-column: 80
 *  scroll-step: 1
 *  End:
 */