sw.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/time.h"
#include "lib/misc.h"
#include "lib/memory.h"
#include "lib/locality.h"

#include "fop/fop.h"
#include "rpc/rpc.h"
#include "motr/setup.h" /* CS_MAX_EP_ADDR_LEN */

#include "cm/proxy.h"
#include "cm/sw.h"
#include "cm/cm.h"

M0_INTERNAL bool m0_cm_sw_is_set(const struct m0_cm_sw *sw)
{
        return m0_cm_ag_id_is_set(&sw->sw_lo) ||
                m0_cm_ag_id_is_set(&sw->sw_hi);
}

M0_INTERNAL bool m0_cm_sw_cmp(const struct m0_cm_sw *sw0, const struct m0_cm_sw *sw1)
{
        return m0_cm_ag_id_cmp(&sw0->sw_lo, &sw1->sw_lo) ?:
                m0_cm_ag_id_cmp(&sw0->sw_hi, &sw1->sw_hi);
}

M0_INTERNAL void m0_cm_sw_set(struct m0_cm_sw *dst,
                              const struct m0_cm_ag_id *lo,
                              const struct m0_cm_ag_id *hi)
{
        M0_PRE(dst != NULL && lo != NULL && hi != NULL);

        m0_cm_ag_id_copy(&dst->sw_lo, lo);
        m0_cm_ag_id_copy(&dst->sw_hi, hi);
}

M0_INTERNAL void m0_cm_sw_copy(struct m0_cm_sw *dst,
                               const struct m0_cm_sw *src)
{
        M0_PRE(dst != NULL && src != NULL);

        m0_cm_ag_id_copy(&dst->sw_lo, &src->sw_lo);
        m0_cm_ag_id_copy(&dst->sw_hi, &src->sw_hi);
}

M0_INTERNAL int m0_cm_sw_onwire_init(struct m0_cm *cm,
                                     struct m0_cm_sw_onwire *sw_onwire,
                                     uint64_t proxy_id, const char *ep,
                                     const struct m0_cm_sw *sw,
                                     const struct m0_cm_sw *out_interval)
{
        M0_PRE(m0_cm_is_locked(cm));
        M0_PRE(sw_onwire != NULL && ep != NULL && sw != NULL);

        M0_ENTRY("cm %p, done %d", cm, (int)cm->cm_done);
        m0_cm_sw_copy(&sw_onwire->swo_in_interval, sw);
        m0_cm_sw_copy(&sw_onwire->swo_out_interval, out_interval);
        sw_onwire->swo_cm_ep.ep_size = CS_MAX_EP_ADDR_LEN;
        sw_onwire->swo_cm_epoch = cm->cm_epoch;
        sw_onwire->swo_sender_id = proxy_id;
        M0_ALLOC_ARR(sw_onwire->swo_cm_ep.ep, CS_MAX_EP_ADDR_LEN);
        if (sw_onwire->swo_cm_ep.ep == NULL )
                return M0_ERR(-ENOMEM);
        strncpy(sw_onwire->swo_cm_ep.ep, ep, CS_MAX_EP_ADDR_LEN);
        if (m0_cm_state_get(cm) == M0_CMS_FAIL)
                sw_onwire->swo_cm_status = M0_PX_FAILED;
        else if (m0_cm_state_get(cm) == M0_CMS_READY)
                        sw_onwire->swo_cm_status = M0_PX_READY;
        else if ((!m0_cm_cp_pump_is_complete(&cm->cm_cp_pump) ||
                 !cm->cm_sw_update.swu_is_complete) &&
                 m0_cm_state_get(cm) == M0_CMS_ACTIVE)
                        sw_onwire->swo_cm_status = M0_PX_ACTIVE;
        else if (m0_cm_cp_pump_is_complete(&cm->cm_cp_pump) &&
                 cm->cm_sw_update.swu_is_complete &&
                 !m0_cm_aggr_group_tlists_are_empty(cm))
                        sw_onwire->swo_cm_status = M0_PX_COMPLETE;
        else
                sw_onwire->swo_cm_status = M0_PX_STOP;

        M0_LOG(M0_DEBUG, "local ep=%s state=%u",
                         sw_onwire->swo_cm_ep.ep,
                         sw_onwire->swo_cm_status);

        return M0_RC(0);
}

M0_INTERNAL int m0_cm_sw_local_update(struct m0_cm *cm)
{
        int rc;

        M0_ENTRY("cm: %p", cm);
        M0_PRE(cm != NULL);
        M0_PRE(m0_cm_is_locked(cm));

        rc = m0_cm_ag_advance(cm);

        return M0_RC(rc);
}

M0_INTERNAL int m0_cm_sw_remote_update(struct m0_cm *cm)
{
        struct m0_cm_proxy *pxy;
        struct m0_cm_sw     in_interval;
        struct m0_cm_sw     out_interval;
        bool                start = false;
        int                 rc = 0;
        M0_ENTRY();

        M0_PRE(cm != NULL);
        M0_PRE(m0_cm_is_locked(cm));

        m0_cm_ag_in_interval(cm, &in_interval);
        /* We reset in_interval::sw_hi in M0_CMS_READY state to
         * struct m0_cm::cm_sw_last_updated_hi, read from persistent
         * store, saved from previous sns operation which could have
         * been quiesced and in-order to resume from the same.
         */
        m0_cm_ag_id_copy(&in_interval.sw_hi, &cm->cm_sw_last_updated_hi);
        if (m0_cm_state_get(cm) == M0_CMS_READY) {
                start = true;
        }
        m0_cm_ag_out_interval(cm, &out_interval);
        m0_tl_for(proxy, &cm->cm_proxies, pxy) {
                pxy->px_send_final_update = cm->cm_done;
                M0_LOG(M0_DEBUG, "proxy %p (%s) last updated"M0_AG_F,
                                 pxy, pxy->px_endpoint,
                                 M0_AG_P(&pxy->px_last_sw_onwire_sent.sw_hi));
                if ((start || pxy->px_send_final_update || cm->cm_quiesce ||
                    cm->cm_abort ||
                    !m0_cm_proxy_is_updated(pxy, &in_interval)) &&
                    pxy->px_update_rc == 0) {
                        rc = m0_cm_proxy_remote_update(pxy, &in_interval,
                                                       &out_interval);
                        if (rc != 0)
                                break;
                }
        } m0_tl_endfor;

        return M0_RC(rc);
}

#undef M0_TRACE_SUBSYSTEM

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