/* SPDX-License-Identifier: LGPL-2.1+
 * Copyright © 2019 VMware, Inc. */

#include <linux/pkt_sched.h>

#include "alloc-util.h"
#include "conf-parser.h"
#include "netlink-util.h"
#include "parse-util.h"
#include "qdisc.h"
#include "string-util.h"

static int fair_queueing_controlled_delay_init(QDisc *qdisc) {
        FairQueueingControlledDelay *fqcd;

        assert(qdisc);

        fqcd = FQ_CODEL(qdisc);

        fqcd->memory_limit = UINT32_MAX;
        fqcd->ce_threshold_usec = USEC_INFINITY;
        fqcd->ecn = -1;

        return 0;
}

static int fair_queueing_controlled_delay_fill_message(Link *link, QDisc *qdisc, sd_netlink_message *req) {
        FairQueueingControlledDelay *fqcd;
        int r;

        assert(link);
        assert(qdisc);
        assert(req);

        fqcd = FQ_CODEL(qdisc);

        r = sd_netlink_message_open_container_union(req, TCA_OPTIONS, "fq_codel");
        if (r < 0)
                return log_link_error_errno(link, r, "Could not open container TCA_OPTIONS: %m");

        if (fqcd->packet_limit > 0) {
                r = sd_netlink_message_append_u32(req, TCA_FQ_CODEL_LIMIT, fqcd->packet_limit);
                if (r < 0)
                        return log_link_error_errno(link, r, "Could not append TCA_FQ_CODEL_LIMIT attribute: %m");
        }

        if (fqcd->flows > 0) {
                r = sd_netlink_message_append_u32(req, TCA_FQ_CODEL_FLOWS, fqcd->flows);
                if (r < 0)
                        return log_link_error_errno(link, r, "Could not append TCA_FQ_CODEL_FLOWS attribute: %m");
        }

        if (fqcd->quantum > 0) {
                r = sd_netlink_message_append_u32(req, TCA_FQ_CODEL_QUANTUM, fqcd->quantum);
                if (r < 0)
                        return log_link_error_errno(link, r, "Could not append TCA_FQ_CODEL_QUANTUM attribute: %m");
        }

        if (fqcd->interval_usec > 0) {
                r = sd_netlink_message_append_u32(req, TCA_FQ_CODEL_INTERVAL, fqcd->interval_usec);
                if (r < 0)
                        return log_link_error_errno(link, r, "Could not append TCA_FQ_CODEL_INTERVAL attribute: %m");
        }

        if (fqcd->target_usec > 0) {
                r = sd_netlink_message_append_u32(req, TCA_FQ_CODEL_TARGET, fqcd->target_usec);
                if (r < 0)
                        return log_link_error_errno(link, r, "Could not append TCA_FQ_CODEL_TARGET attribute: %m");
        }

        if (fqcd->ecn >= 0) {
                r = sd_netlink_message_append_u32(req, TCA_FQ_CODEL_ECN, fqcd->ecn);
                if (r < 0)
                        return log_link_error_errno(link, r, "Could not append TCA_FQ_CODEL_ECN attribute: %m");
        }

        if (fqcd->ce_threshold_usec != USEC_INFINITY) {
                r = sd_netlink_message_append_u32(req, TCA_FQ_CODEL_CE_THRESHOLD, fqcd->ce_threshold_usec);
                if (r < 0)
                        return log_link_error_errno(link, r, "Could not append TCA_FQ_CODEL_CE_THRESHOLD attribute: %m");
        }

        if (fqcd->memory_limit != UINT32_MAX) {
                r = sd_netlink_message_append_u32(req, TCA_FQ_CODEL_MEMORY_LIMIT, fqcd->memory_limit);
                if (r < 0)
                        return log_link_error_errno(link, r, "Could not append TCA_FQ_CODEL_MEMORY_LIMIT attribute: %m");
        }

        r = sd_netlink_message_close_container(req);
        if (r < 0)
                return log_link_error_errno(link, r, "Could not close container TCA_OPTIONS: %m");

        return 0;
}

int config_parse_fair_queueing_controlled_delay_u32(
                const char *unit,
                const char *filename,
                unsigned line,
                const char *section,
                unsigned section_line,
                const char *lvalue,
                int ltype,
                const char *rvalue,
                void *data,
                void *userdata) {

        _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL;
        FairQueueingControlledDelay *fqcd;
        Network *network = data;
        uint32_t *p;
        int r;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        r = qdisc_new_static(QDISC_KIND_FQ_CODEL, network, filename, section_line, &qdisc);
        if (r == -ENOMEM)
                return log_oom();
        if (r < 0)
                return log_syntax(unit, LOG_ERR, filename, line, r,
                                  "More than one kind of queueing discipline, ignoring assignment: %m");

        fqcd = FQ_CODEL(qdisc);

        if (streq(lvalue, "PacketLimit"))
                p = &fqcd->packet_limit;
        else if (streq(lvalue, "Flows"))
                p = &fqcd->flows;
        else
                assert_not_reached("Invalid lvalue.");

        if (isempty(rvalue)) {
                *p = 0;

                qdisc = NULL;
                return 0;
        }

        r = safe_atou32(rvalue, p);
        if (r < 0) {
                log_syntax(unit, LOG_ERR, filename, line, r,
                           "Failed to parse '%s=', ignoring assignment: %s",
                           lvalue, rvalue);
                return 0;
        }

        qdisc = NULL;

        return 0;
}

int config_parse_fair_queueing_controlled_delay_usec(
                const char *unit,
                const char *filename,
                unsigned line,
                const char *section,
                unsigned section_line,
                const char *lvalue,
                int ltype,
                const char *rvalue,
                void *data,
                void *userdata) {

        _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL;
        FairQueueingControlledDelay *fqcd;
        Network *network = data;
        usec_t *p;
        int r;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        r = qdisc_new_static(QDISC_KIND_FQ_CODEL, network, filename, section_line, &qdisc);
        if (r == -ENOMEM)
                return log_oom();
        if (r < 0)
                return log_syntax(unit, LOG_ERR, filename, line, r,
                                  "More than one kind of queueing discipline, ignoring assignment: %m");

        fqcd = FQ_CODEL(qdisc);

        if (streq(lvalue, "TargetSec"))
                p = &fqcd->target_usec;
        else if (streq(lvalue, "IntervalSec"))
                p = &fqcd->interval_usec;
        else if (streq(lvalue, "CEThresholdSec"))
                p = &fqcd->ce_threshold_usec;
        else
                assert_not_reached("Invalid lvalue.");

        if (isempty(rvalue)) {
                if (streq(lvalue, "CEThresholdSec"))
                        *p = USEC_INFINITY;
                else
                        *p = 0;

                qdisc = NULL;
                return 0;
        }

        r = parse_sec(rvalue, p);
        if (r < 0) {
                log_syntax(unit, LOG_ERR, filename, line, r,
                           "Failed to parse '%s=', ignoring assignment: %s",
                           lvalue, rvalue);
                return 0;
        }

        qdisc = NULL;

        return 0;
}

int config_parse_fair_queueing_controlled_delay_bool(
                const char *unit,
                const char *filename,
                unsigned line,
                const char *section,
                unsigned section_line,
                const char *lvalue,
                int ltype,
                const char *rvalue,
                void *data,
                void *userdata) {

        _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL;
        FairQueueingControlledDelay *fqcd;
        Network *network = data;
        int r;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        r = qdisc_new_static(QDISC_KIND_FQ_CODEL, network, filename, section_line, &qdisc);
        if (r == -ENOMEM)
                return log_oom();
        if (r < 0)
                return log_syntax(unit, LOG_ERR, filename, line, r,
                                  "More than one kind of queueing discipline, ignoring assignment: %m");

        fqcd = FQ_CODEL(qdisc);

        if (isempty(rvalue)) {
                fqcd->ecn = -1;

                qdisc = NULL;
                return 0;
        }

        r = parse_boolean(rvalue);
        if (r < 0) {
                log_syntax(unit, LOG_ERR, filename, line, r,
                           "Failed to parse '%s=', ignoring assignment: %s",
                           lvalue, rvalue);
                return 0;
        }

        fqcd->ecn = r;
        qdisc = NULL;

        return 0;
}

int config_parse_fair_queueing_controlled_delay_size(
                const char *unit,
                const char *filename,
                unsigned line,
                const char *section,
                unsigned section_line,
                const char *lvalue,
                int ltype,
                const char *rvalue,
                void *data,
                void *userdata) {

        _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL;
        FairQueueingControlledDelay *fqcd;
        Network *network = data;
        uint64_t sz;
        uint32_t *p;
        int r;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        r = qdisc_new_static(QDISC_KIND_FQ_CODEL, network, filename, section_line, &qdisc);
        if (r == -ENOMEM)
                return log_oom();
        if (r < 0)
                return log_syntax(unit, LOG_ERR, filename, line, r,
                                  "More than one kind of queueing discipline, ignoring assignment: %m");

        fqcd = FQ_CODEL(qdisc);

        if (streq(lvalue, "MemoryLimit"))
                p = &fqcd->memory_limit;
        else if (streq(lvalue, "Quantum"))
                p = &fqcd->quantum;
        else
                assert_not_reached("Invalid lvalue.");

        if (isempty(rvalue)) {
                if (streq(lvalue, "MemoryLimit"))
                        *p = UINT32_MAX;
                else
                        *p = 0;

                qdisc = NULL;
                return 0;
        }

        r = parse_size(rvalue, 1024, &sz);
        if (r < 0) {
                log_syntax(unit, LOG_ERR, filename, line, r,
                           "Failed to parse '%s=', ignoring assignment: %s",
                           lvalue, rvalue);
                return 0;
        }
        if (sz >= UINT32_MAX) {
                log_syntax(unit, LOG_ERR, filename, line, r,
                           "Specified '%s=' is too large, ignoring assignment: %s",
                           lvalue, rvalue);
                return 0;
        }

        *p = sz;
        qdisc = NULL;

        return 0;
}

const QDiscVTable fq_codel_vtable = {
        .object_size = sizeof(FairQueueingControlledDelay),
        .tca_kind = "fq_codel",
        .init = fair_queueing_controlled_delay_init,
        .fill_message = fair_queueing_controlled_delay_fill_message,
};
