ipcpd: Shorten packet_scheduler to psched

This shortens packet_scheduler to psched, which results in more
readable code.

Signed-off-by: Sander Vrijders <sander.vrijders@ugent.be>
Signed-off-by: Dimitri Staessens <dimitri.staessens@ugent.be>

1 files changed, 241 insertions, 0 deletions

diff --git a/src/ipcpd/normal/psched.c b/src/ipcpd/normal/psched.c
new file mode 100644
index 00000000..27e5f1de
--- /dev/null
+++ b/src/ipcpd/normal/psched.c
@@ -0,0 +1,241 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2018
+ *
+ * Packet scheduler component
+ *
+ *    Dimitri Staessens <dimitri.staessens@ugent.be>
+ *    Sander Vrijders   <sander.vrijders@ugent.be>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., http://www.fsf.org/about/contact/.
+ */
+
+#if defined(__linux__) || defined(__CYGWIN__)
+#define _DEFAULT_SOURCE
+#else
+#define _POSIX_C_SOURCE 200112L
+#endif
+
+#include "config.h"
+
+#include <ouroboros/errno.h>
+#include <ouroboros/notifier.h>
+
+#include "ipcp.h"
+#include "psched.h"
+#include "connmgr.h"
+
+#include <assert.h>
+#include <sched.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+
+static int qos_prio [] = {
+        QOS_PRIO_RAW,
+        QOS_PRIO_BE,
+        QOS_PRIO_VIDEO,
+        QOS_PRIO_VOICE,
+        QOS_PRIO_DATA
+};
+
+struct psched {
+        fset_t *         set[QOS_CUBE_MAX];
+        next_packet_fn_t callback;
+        pthread_t        readers[QOS_CUBE_MAX * IPCP_SCHED_THR_MUL];
+};
+
+struct sched_info {
+        struct psched * sch;
+        qoscube_t       qc;
+};
+
+static void cleanup_reader(void * o)
+{
+        fqueue_destroy((fqueue_t *) o);
+}
+
+static void * packet_reader(void * o)
+{
+        struct psched *       sched;
+        struct shm_du_buff *  sdb;
+        int                   fd;
+        fqueue_t *            fq;
+        qoscube_t             qc;
+
+        sched = ((struct sched_info *) o)->sch;
+        qc    = ((struct sched_info *) o)->qc;
+
+        ipcp_lock_to_core();
+
+        free(o);
+
+        fq = fqueue_create();
+        if (fq == NULL)
+                return (void *) -1;
+
+        pthread_cleanup_push(cleanup_reader, fq);
+
+        while (true) {
+                int ret = fevent(sched->set[qc], fq, NULL);
+                if (ret < 0)
+                        continue;
+
+                while ((fd = fqueue_next(fq)) >= 0) {
+                        switch (fqueue_type(fq)) {
+                        case FLOW_DEALLOC:
+                                notifier_event(NOTIFY_DT_FLOW_DEALLOC, &fd);
+                                break;
+                        case FLOW_DOWN:
+                                notifier_event(NOTIFY_DT_FLOW_DOWN, &fd);
+                                break;
+                        case FLOW_UP:
+                                notifier_event(NOTIFY_DT_FLOW_UP, &fd);
+                                break;
+                        case FLOW_PKT:
+                                if (ipcp_flow_read(fd, &sdb))
+                                        continue;
+
+                                sched->callback(fd, qc, sdb);
+                                break;
+                        default:
+                                break;
+                        }
+                }
+        }
+
+        pthread_cleanup_pop(true);
+
+        return (void *) 0;
+}
+
+struct psched * psched_create(next_packet_fn_t callback)
+{
+        struct psched *       psched;
+        struct sched_info *   infos[QOS_CUBE_MAX * IPCP_SCHED_THR_MUL];
+        int                   i;
+        int                   j;
+
+        assert(callback);
+
+        psched = malloc(sizeof(*psched));
+        if (psched == NULL)
+                goto fail_malloc;
+
+        psched->callback = callback;
+
+        for (i = 0; i < QOS_CUBE_MAX; ++i) {
+                psched->set[i] = fset_create();
+                if (psched->set[i] == NULL) {
+                        for (j = 0; j < i; ++j)
+                                fset_destroy(psched->set[j]);
+                        goto fail_flow_set;
+                }
+        }
+
+        for (i = 0; i < QOS_CUBE_MAX * IPCP_SCHED_THR_MUL; ++i) {
+                infos[i] = malloc(sizeof(*infos[i]));
+                if (infos[i] == NULL) {
+                        for (j = 0; j < i; ++j)
+                                free(infos[j]);
+                        goto fail_infos;
+                }
+                infos[i]->sch = psched;
+                infos[i]->qc  = i % QOS_CUBE_MAX;
+        }
+
+        for (i = 0; i < QOS_CUBE_MAX * IPCP_SCHED_THR_MUL; ++i) {
+                if (pthread_create(&psched->readers[i], NULL,
+                                   packet_reader, infos[i])) {
+                        for (j = 0; j < i; ++j)
+                                pthread_cancel(psched->readers[j]);
+                        for (j = 0; j < i; ++j)
+                                pthread_join(psched->readers[j], NULL);
+                        for (j = i; j < QOS_CUBE_MAX * IPCP_SCHED_THR_MUL; ++j)
+                                free(infos[i]);
+                        goto fail_infos;
+                }
+        }
+
+        for (i = 0; i < QOS_CUBE_MAX * IPCP_SCHED_THR_MUL; ++i) {
+                struct sched_param  par;
+                int                 pol = SCHED_RR;
+                int                 min;
+                int                 max;
+
+                min = sched_get_priority_min(pol);
+                max = sched_get_priority_max(pol);
+
+                min = (max - min) / 2;
+
+                par.sched_priority = min +
+                        (qos_prio[i % QOS_CUBE_MAX] * (max - min) / 99);
+
+                if (pthread_setschedparam(psched->readers[i], pol, &par))
+                        goto fail_sched;
+        }
+
+        return psched;
+
+ fail_sched:
+        for (j = 0; j < QOS_CUBE_MAX * IPCP_SCHED_THR_MUL; ++j)
+                pthread_cancel(psched->readers[j]);
+        for (j = 0; j < QOS_CUBE_MAX * IPCP_SCHED_THR_MUL; ++j)
+                pthread_join(psched->readers[j], NULL);
+ fail_infos:
+        for (j = 0; j < QOS_CUBE_MAX; ++j)
+                fset_destroy(psched->set[j]);
+ fail_flow_set:
+        free(psched);
+ fail_malloc:
+        return NULL;
+}
+
+void psched_destroy(struct psched * psched)
+{
+        int i;
+
+        assert(psched);
+
+        for (i = 0; i < QOS_CUBE_MAX * IPCP_SCHED_THR_MUL; ++i) {
+                pthread_cancel(psched->readers[i]);
+                pthread_join(psched->readers[i], NULL);
+        }
+
+        for (i = 0; i < QOS_CUBE_MAX; ++i)
+                fset_destroy(psched->set[i]);
+
+        free(psched);
+}
+
+void psched_add(struct psched * psched,
+                      int       fd)
+{
+        qoscube_t qc;
+
+        assert(psched);
+
+        ipcp_flow_get_qoscube(fd, &qc);
+        fset_add(psched->set[qc], fd);
+}
+
+void psched_del(struct psched * psched,
+                      int       fd)
+{
+        qoscube_t qc;
+
+        assert(psched);
+
+        ipcp_flow_get_qoscube(fd, &qc);
+        fset_del(psched->set[qc], fd);
+}