Imported Upstream version 16.04

[deb_dpdk.git] / lib / librte_eal / common / rte_keepalive.c

diff --git a/lib/librte_eal/common/rte_keepalive.c b/lib/librte_eal/common/rte_keepalive.c
new file mode 100644 (file)
index 0000000..23363ec
--- /dev/null
+++ b/lib/librte_eal/common/rte_keepalive.c
@@ -0,0 +1,149 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2015-2016 Intel Corporation. All rights reserved.
+ *
+ *   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.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <inttypes.h>
+
+#include <rte_common.h>
+#include <rte_cycles.h>
+#include <rte_lcore.h>
+#include <rte_log.h>
+#include <rte_keepalive.h>
+#include <rte_malloc.h>
+#include <rte_cycles.h>
+
+struct rte_keepalive {
+       /** Core Liveness. */
+       enum rte_keepalive_state {
+               ALIVE = 1,
+               MISSING = 0,
+               DEAD = 2,
+               GONE = 3
+       } __rte_cache_aligned state_flags[RTE_KEEPALIVE_MAXCORES];
+
+       /** Last-seen-alive timestamps */
+       uint64_t last_alive[RTE_KEEPALIVE_MAXCORES];
+
+       /**
+        * Cores to check.
+        * Indexed by core id, non-zero if the core should be checked.
+        */
+       uint8_t active_cores[RTE_KEEPALIVE_MAXCORES];
+
+       /** Dead core handler. */
+       rte_keepalive_failure_callback_t callback;
+
+       /**
+        * Dead core handler app data.
+        * Pointer is passed to dead core handler.
+        */
+       void *callback_data;
+       uint64_t tsc_initial;
+       uint64_t tsc_mhz;
+};
+
+static void
+print_trace(const char *msg, struct rte_keepalive *keepcfg, int idx_core)
+{
+       RTE_LOG(INFO, EAL, "%sLast seen %" PRId64 "ms ago.\n",
+               msg,
+               ((rte_rdtsc() - keepcfg->last_alive[idx_core])*1000)
+               / rte_get_tsc_hz()
+             );
+}
+
+void
+rte_keepalive_dispatch_pings(__rte_unused void *ptr_timer,
+       void *ptr_data)
+{
+       struct rte_keepalive *keepcfg = ptr_data;
+       int idx_core;
+
+       for (idx_core = 0; idx_core < RTE_KEEPALIVE_MAXCORES; idx_core++) {
+               if (keepcfg->active_cores[idx_core] == 0)
+                       continue;
+
+               switch (keepcfg->state_flags[idx_core]) {
+               case ALIVE: /* Alive */
+                       keepcfg->state_flags[idx_core] = MISSING;
+                       keepcfg->last_alive[idx_core] = rte_rdtsc();
+                       break;
+               case MISSING: /* MIA */
+                       print_trace("Core MIA. ", keepcfg, idx_core);
+                       keepcfg->state_flags[idx_core] = DEAD;
+                       break;
+               case DEAD: /* Dead */
+                       keepcfg->state_flags[idx_core] = GONE;
+                       print_trace("Core died. ", keepcfg, idx_core);
+                       if (keepcfg->callback)
+                               keepcfg->callback(
+                                       keepcfg->callback_data,
+                                       idx_core
+                                       );
+                       break;
+               case GONE: /* Buried */
+                       break;
+               }
+       }
+}
+
+struct rte_keepalive *
+rte_keepalive_create(rte_keepalive_failure_callback_t callback,
+       void *data)
+{
+       struct rte_keepalive *keepcfg;
+
+       keepcfg = rte_zmalloc("RTE_EAL_KEEPALIVE",
+               sizeof(struct rte_keepalive),
+               RTE_CACHE_LINE_SIZE);
+       if (keepcfg != NULL) {
+               keepcfg->callback = callback;
+               keepcfg->callback_data = data;
+               keepcfg->tsc_initial = rte_rdtsc();
+               keepcfg->tsc_mhz = rte_get_tsc_hz() / 1000;
+       }
+       return keepcfg;
+}
+
+void
+rte_keepalive_register_core(struct rte_keepalive *keepcfg, const int id_core)
+{
+       if (id_core < RTE_KEEPALIVE_MAXCORES) {
+               keepcfg->active_cores[id_core] = 1;
+               keepcfg->last_alive[id_core] = rte_rdtsc();
+       }
+}
+
+void
+rte_keepalive_mark_alive(struct rte_keepalive *keepcfg)
+{
+       keepcfg->state_flags[rte_lcore_id()] = ALIVE;
+}