[dpdk-dev] [PATCH v8 08/10] eal: add minimum viable code for eal on windows

[Anand Rawat <anand.rawat@intel.com>]

Add windows specific logic for eal.c, eal_lcore.c,
eal_debug.c and eal_thread.c. Updated header files to
contain suitable function declaractions.

Signed-off-by: Anand Rawat <anand.rawat@intel.com>
Signed-off-by: Pallavi Kadam <pallavi.kadam@intel.com>
Reviewed-by: Jeff Shaw <jeffrey.b.shaw@intel.com>
Reviewed-by: Ranjit Menon <ranjit.menon@intel.com>
---
 lib/librte_eal/windows/eal/eal.c            |  76 +++++++++-
 lib/librte_eal/windows/eal/eal_debug.c      |  14 +-
 lib/librte_eal/windows/eal/eal_lcore.c      | 102 +++++++++++---
 lib/librte_eal/windows/eal/eal_thread.c     | 145 +++++++++++++++++++-
 lib/librte_eal/windows/eal/include/regex.h  |   2 +
 lib/librte_eal/windows/eal/include/rte_os.h |  20 +++
 lib/librte_eal/windows/eal/meson.build      |   2 +
 7 files changed, 331 insertions(+), 30 deletions(-)

diff --git a/lib/librte_eal/windows/eal/eal.c b/lib/librte_eal/windows/eal/eal.c
index 37ed42233..ce460481f 100644
--- a/lib/librte_eal/windows/eal/eal.c
+++ b/lib/librte_eal/windows/eal/eal.c
@@ -2,13 +2,83 @@
  * Copyright(c) 2019 Intel Corporation
  */
 
-#include <rte_common.h>
+#include <io.h>
+#include <fcntl.h>
+#include <rte_debug.h>
+#include <rte_eal.h>
+#include <rte_errno.h>
+#include <rte_lcore.h>
+#include <eal_thread.h>
+#include <eal_private.h>
+
+/* Address of global and public configuration */
+static struct rte_config rte_config;
+
+/* internal configuration (per-core) */
+struct lcore_config lcore_config[RTE_MAX_LCORE];
+
+/* Return a pointer to the configuration structure */
+struct rte_config *
+rte_eal_get_configuration(void)
+{
+	return &rte_config;
+}
+
+static int
+sync_func(void *arg __rte_unused)
+{
+	return 0;
+}
+
+static void
+rte_eal_init_alert(const char *msg)
+{
+	fprintf(stderr, "EAL: FATAL: %s\n", msg);
+	RTE_LOG(ERR, EAL, "%s\n", msg);
+}
 
  /* Launch threads, called at application init(). */
 int
 rte_eal_init(int argc __rte_unused, char **argv __rte_unused)
 {
-	/* TODO */
-	/* This is a stub, not the expected result */
+	int i;
+
+	/* create a map of all processors in the system */
+	eal_create_cpu_map();
+
+	if (rte_eal_cpu_init() < 0) {
+		rte_eal_init_alert("Cannot detect lcores.");
+		rte_errno = ENOTSUP;
+		return -1;
+	}
+
+	eal_thread_init_master(rte_config.master_lcore);
+
+	RTE_LCORE_FOREACH_SLAVE(i) {
+
+		/*
+		 * create communication pipes between master thread
+		 * and children
+		 */
+		if (_pipe(lcore_config[i].pipe_master2slave,
+			sizeof(char), _O_BINARY) < 0)
+			rte_panic("Cannot create pipe\n");
+		if (_pipe(lcore_config[i].pipe_slave2master,
+			sizeof(char), _O_BINARY) < 0)
+			rte_panic("Cannot create pipe\n");
+
+		lcore_config[i].state = WAIT;
+
+		/* create a thread for each lcore */
+		if (eal_thread_create(&lcore_config[i].thread_id) != 0)
+			rte_panic("Cannot create thread\n");
+	}
+
+	/*
+	 * Launch a dummy function on all slave lcores, so that master lcore
+	 * knows they are all ready when this function returns.
+	 */
+	rte_eal_mp_remote_launch(sync_func, NULL, SKIP_MASTER);
+	rte_eal_mp_wait_lcore();
 	return 0;
 }
diff --git a/lib/librte_eal/windows/eal/eal_debug.c b/lib/librte_eal/windows/eal/eal_debug.c
index a9705e257..edcf257cc 100644
--- a/lib/librte_eal/windows/eal/eal_debug.c
+++ b/lib/librte_eal/windows/eal/eal_debug.c
@@ -2,14 +2,18 @@
  * Copyright(c) 2019 Intel Corporation
  */
 
-#include <rte_common.h>
+#include <stdarg.h>
+#include <rte_log.h>
 
  /* call abort(), it will generate a coredump if enabled */
 void
-__rte_panic(const char *funcname __rte_unused,
-		const char *format __rte_unused, ...)
+__rte_panic(const char *funcname, const char *format, ...)
 {
-	/* TODO */
-	/* This is a stub, not the expected result */
+	va_list ap;
+
+	rte_log(RTE_LOG_CRIT, RTE_LOGTYPE_EAL, "PANIC in %s():\n", funcname);
+	va_start(ap, format);
+	rte_vlog(RTE_LOG_CRIT, RTE_LOGTYPE_EAL, format, ap);
+	va_end(ap);
 	abort();
 }
diff --git a/lib/librte_eal/windows/eal/eal_lcore.c b/lib/librte_eal/windows/eal/eal_lcore.c
index e4fcb2615..d39f348a3 100644
--- a/lib/librte_eal/windows/eal/eal_lcore.c
+++ b/lib/librte_eal/windows/eal/eal_lcore.c
@@ -2,31 +2,99 @@
  * Copyright(c) 2019 Intel Corporation
  */
 
+#include <stdint.h>
+
 #include <rte_common.h>
 
- /* Get the cpu core id value */
-unsigned int
-eal_cpu_core_id(unsigned int lcore_id)
+/* global data structure that contains the CPU map */
+static struct _wcpu_map {
+	unsigned int total_procs;
+	unsigned int proc_sockets;
+	unsigned int proc_cores;
+	unsigned int reserved;
+	struct _win_lcore_map {
+		uint8_t socket_id;
+		uint8_t core_id;
+	} wlcore_map[RTE_MAX_LCORE];
+} wcpu_map = { 0 };
+
+/*
+ * Create a map of all processors and associated cores on the system
+ */
+void
+eal_create_cpu_map()
 {
-	/* TODO */
-	/* This is a stub, not the expected result */
-	return lcore_id;
+	wcpu_map.total_procs =
+		GetActiveProcessorCount(ALL_PROCESSOR_GROUPS);
+
+	LOGICAL_PROCESSOR_RELATIONSHIP lprocRel;
+	DWORD lprocInfoSize = 0;
+	BOOL ht_enabled = FALSE;
+
+	/* First get the processor package information */
+	lprocRel = RelationProcessorPackage;
+	/* Determine the size of buffer we need (pass NULL) */
+	GetLogicalProcessorInformationEx(lprocRel, NULL, &lprocInfoSize);
+	wcpu_map.proc_sockets = lprocInfoSize / 48;
+
+	lprocInfoSize = 0;
+	/* Next get the processor core information */
+	lprocRel = RelationProcessorCore;
+	GetLogicalProcessorInformationEx(lprocRel, NULL, &lprocInfoSize);
+	wcpu_map.proc_cores = lprocInfoSize / 48;
+
+	if (wcpu_map.total_procs > wcpu_map.proc_cores)
+		ht_enabled = TRUE;
+
+	/* Distribute the socket and core ids appropriately
+	 * across the logical cores. For now, split the cores
+	 * equally across the sockets.
+	 */
+	unsigned int lcore = 0;
+	for (unsigned int socket = 0; socket <
+			wcpu_map.proc_sockets; ++socket) {
+		for (unsigned int core = 0;
+			core < (wcpu_map.proc_cores / wcpu_map.proc_sockets);
+			++core) {
+			wcpu_map.wlcore_map[lcore]
+					.socket_id = socket;
+			wcpu_map.wlcore_map[lcore]
+					.core_id = core;
+			lcore++;
+			if (ht_enabled) {
+				wcpu_map.wlcore_map[lcore]
+					.socket_id = socket;
+				wcpu_map.wlcore_map[lcore]
+					.core_id = core;
+				lcore++;
+			}
+		}
+	}
 }
 
-/* Check if a cpu is present by the presence of the cpu information for it */
+/*
+ * Check if a cpu is present by the presence of the cpu information for it
+ */
 int
-eal_cpu_detected(unsigned int lcore_id __rte_unused)
+eal_cpu_detected(unsigned int lcore_id)
+{
+	return (lcore_id < wcpu_map.total_procs);
+}
+
+/*
+ * Get CPU socket id for a logical core
+ */
+unsigned
+eal_cpu_socket_id(unsigned int lcore_id)
 {
-	/* TODO */
-	/* This is a stub, not the expected result */
-	return 1;
+	return wcpu_map.wlcore_map[lcore_id].socket_id;
 }
 
-/* Get CPU socket id (NUMA node) for a logical core */
-unsigned int
-eal_cpu_socket_id(unsigned int cpu_id __rte_unused)
+/*
+ * Get CPU socket id (NUMA node) for a logical core
+ */
+unsigned
+eal_cpu_core_id(unsigned int lcore_id)
 {
-	/* TODO */
-	/* This is a stub, not the expected result */
-	return 0;
+	return wcpu_map.wlcore_map[lcore_id].core_id;
 }
diff --git a/lib/librte_eal/windows/eal/eal_thread.c b/lib/librte_eal/windows/eal/eal_thread.c
index f701443c3..906502f90 100644
--- a/lib/librte_eal/windows/eal/eal_thread.c
+++ b/lib/librte_eal/windows/eal/eal_thread.c
@@ -2,17 +2,152 @@
  * Copyright(c) 2019 Intel Corporation
  */
 
-#include <windows.h>
+#include <io.h>
 
+#include <rte_atomic.h>
+#include <rte_debug.h>
+#include <rte_launch.h>
+#include <rte_lcore.h>
+#include <rte_per_lcore.h>
 #include <rte_common.h>
+#include <eal_thread.h>
 
-typedef uintptr_t eal_thread_t;
+
+RTE_DEFINE_PER_LCORE(unsigned int, _lcore_id) = LCORE_ID_ANY;
+
+/*
+ * Send a message to a slave lcore identified by slave_id to call a
+ * function f with argument arg. Once the execution is done, the
+ * remote lcore switch in FINISHED state.
+ */
+int
+rte_eal_remote_launch(lcore_function_t *f, void *arg, unsigned int slave_id)
+{
+	int n;
+	char c = 0;
+	int m2s = lcore_config[slave_id].pipe_master2slave[1];
+	int s2m = lcore_config[slave_id].pipe_slave2master[0];
+
+	if (lcore_config[slave_id].state != WAIT)
+		return -EBUSY;
+
+	lcore_config[slave_id].f = f;
+	lcore_config[slave_id].arg = arg;
+
+	/* send message */
+	n = 0;
+	while (n == 0 || (n < 0 && errno == EINTR))
+		n = _write(m2s, &c, 1);
+	if (n < 0)
+		rte_panic("cannot write on configuration pipe\n");
+
+	/* wait ack */
+	do {
+		n = _read(s2m, &c, 1);
+	} while (n < 0 && errno == EINTR);
+
+	if (n <= 0)
+		rte_panic("cannot read on configuration pipe\n");
+
+	return 0;
+}
+
+void
+eal_thread_init_master(unsigned int lcore_id)
+{
+	/* set the lcore ID in per-lcore memory area */
+	RTE_PER_LCORE(_lcore_id) = lcore_id;
+}
+
+static inline pthread_t
+eal_thread_self(void)
+{
+	return GetCurrentThreadId();
+}
+
+/* main loop of threads */
+void *
+eal_thread_loop(void *arg __rte_unused)
+{
+	char c;
+	int n, ret;
+	unsigned int lcore_id;
+	pthread_t thread_id;
+	int m2s, s2m;
+	char cpuset[RTE_CPU_AFFINITY_STR_LEN];
+
+	thread_id = eal_thread_self();
+
+	/* retrieve our lcore_id from the configuration structure */
+	RTE_LCORE_FOREACH_SLAVE(lcore_id) {
+		if (thread_id == lcore_config[lcore_id].thread_id)
+			break;
+	}
+	if (lcore_id == RTE_MAX_LCORE)
+		rte_panic("cannot retrieve lcore id\n");
+
+	m2s = lcore_config[lcore_id].pipe_master2slave[0];
+	s2m = lcore_config[lcore_id].pipe_slave2master[1];
+
+	/* set the lcore ID in per-lcore memory area */
+	RTE_PER_LCORE(_lcore_id) = lcore_id;
+
+	RTE_LOG(DEBUG, EAL, "lcore %u is ready (tid=%zx;cpuset=[%s])\n",
+		lcore_id, (uintptr_t)thread_id, cpuset);
+
+	/* read on our pipe to get commands */
+	while (1) {
+		void *fct_arg;
+
+		/* wait command */
+		do {
+			n = _read(m2s, &c, 1);
+		} while (n < 0 && errno == EINTR);
+
+		if (n <= 0)
+			rte_panic("cannot read on configuration pipe\n");
+
+		lcore_config[lcore_id].state = RUNNING;
+
+		/* send ack */
+		n = 0;
+		while (n == 0 || (n < 0 && errno == EINTR))
+			n = _write(s2m, &c, 1);
+		if (n < 0)
+			rte_panic("cannot write on configuration pipe\n");
+
+		if (lcore_config[lcore_id].f == NULL)
+			rte_panic("NULL function pointer\n");
+
+		/* call the function and store the return value */
+		fct_arg = lcore_config[lcore_id].arg;
+		ret = lcore_config[lcore_id].f(fct_arg);
+		lcore_config[lcore_id].ret = ret;
+		rte_wmb();
+
+		/* when a service core returns, it should go directly to WAIT
+		 * state, because the application will not lcore_wait() for it.
+		 */
+		if (lcore_config[lcore_id].core_role == ROLE_SERVICE)
+			lcore_config[lcore_id].state = WAIT;
+		else
+			lcore_config[lcore_id].state = FINISHED;
+	}
+}
 
 /* function to create threads */
 int
-eal_thread_create(eal_thread_t *thread __rte_unused)
+eal_thread_create(pthread_t *thread)
 {
-	/* TODO */
-	/* This is a stub, not the expected result */
+	HANDLE th;
+
+	th = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)eal_thread_loop,
+						NULL, 0, (LPDWORD)thread);
+	if (!th)
+		return -1;
+
+	SetPriorityClass(GetCurrentProcess(), REALTIME_PRIORITY_CLASS);
+	SetThreadPriority(th, THREAD_PRIORITY_TIME_CRITICAL);
+
 	return 0;
 }
diff --git a/lib/librte_eal/windows/eal/include/regex.h b/lib/librte_eal/windows/eal/include/regex.h
index c335120e1..827f93841 100644
--- a/lib/librte_eal/windows/eal/include/regex.h
+++ b/lib/librte_eal/windows/eal/include/regex.h
@@ -17,6 +17,8 @@ extern "C" {
 #define REG_NOMATCH 1
 #define REG_ESPACE 12
 
+#include <rte_common.h>
+
 /* defining regex_t for Windows */
 typedef void *regex_t;
 /* defining regmatch_t for Windows */
diff --git a/lib/librte_eal/windows/eal/include/rte_os.h b/lib/librte_eal/windows/eal/include/rte_os.h
index 8da1e235f..4946af041 100644
--- a/lib/librte_eal/windows/eal/include/rte_os.h
+++ b/lib/librte_eal/windows/eal/include/rte_os.h
@@ -15,7 +15,9 @@
 extern "C" {
 #endif
 
+#include <Windows.h>
 #include <BaseTsd.h>
+#include <pthread.h>
 
 #define strerror_r(a, b, c) strerror_s(b, c, a)
 
@@ -26,6 +28,24 @@ typedef SSIZE_T ssize_t;
 
 #define strtok_r(str, delim, saveptr) strtok_s(str, delim, saveptr)
 
+/**
+ * Create a thread.
+ * This function is private to EAL.
+ *
+ * @param thread
+ *   The location to store the thread id if successful.
+ * @return
+ *   0 for success, -1 if the thread is not created.
+ */
+int eal_thread_create(pthread_t *thread);
+
+/**
+ * Create a map of processors and cores on the system.
+ * This function is private to EAL.
+ *
+ */
+void eal_create_cpu_map(void);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/librte_eal/windows/eal/meson.build b/lib/librte_eal/windows/eal/meson.build
index 8b1735623..6bc577e5c 100644
--- a/lib/librte_eal/windows/eal/meson.build
+++ b/lib/librte_eal/windows/eal/meson.build
@@ -1,6 +1,8 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2019 Intel Corporation
 
+eal_inc += include_directories('include')
+
 env_objs = []
 env_headers = []
 env_sources = files('eal.c',
-- 
2.17.1.windows.2