log: add log stream accessor

Define an accessor so that users can write their debug message to the
same stream than the rte_log infrastructure.
Use it in the qat infrastructure.

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Kevin Traynor <ktraynor@redhat.com>

drivers/common/qat/qat_logs.c

@@ -19,8 +19,7 @@ qat_hexdump_log(uint32_t level, uint32_t logtype, const char *title,
 	if (level > (uint32_t)(rte_log_get_level(logtype)))
 		return 0;
 
-	rte_hexdump(rte_logs.file == NULL ? stderr : rte_logs.file,
-				title, buf, len);
+	rte_hexdump(rte_log_get_stream(), title, buf, len);
 	return 0;
 }
 

drivers/common/qat/qat_logs.h

@@ -24,8 +24,7 @@ extern int qat_dp_logtype;
  *
  * Dump out the message buffer in a special hex dump output format with
  * characters printed for each line of 16 hex values. The message will be sent
- * to the stream defined by rte_logs.file or to stderr in case of rte_logs.file
- * is undefined.
+ * to the stream used by the rte_log infrastructure.
  */
 int
 qat_hexdump_log(uint32_t level, uint32_t logtype, const char *title,

lib/librte_eal/common/eal_common_log.c

@@ -71,6 +71,24 @@ rte_openlog_stream(FILE *f)
 	return 0;
 }
 
+FILE *
+rte_log_get_stream(void)
+{
+	FILE *f = rte_logs.file;
+
+	if (f == NULL) {
+		/*
+		 * Grab the current value of stderr here, rather than
+		 * just initializing default_log_stream to stderr. This
+		 * ensures that we will always use the current value
+		 * of stderr, even if the application closes and
+		 * reopens it.
+		 */
+		return default_log_stream ? : stderr;
+	}
+	return f;
+}
+
 /* Set global log level */
 void
 rte_log_set_global_level(uint32_t level)
@@ -396,21 +414,8 @@ rte_log_dump(FILE *f)
 int
 rte_vlog(uint32_t level, uint32_t logtype, const char *format, va_list ap)
 {
+	FILE *f = rte_log_get_stream();
 	int ret;
-	FILE *f = rte_logs.file;
-	if (f == NULL) {
-		f = default_log_stream;
-		if (f == NULL) {
-			/*
-			 * Grab the current value of stderr here, rather than
-			 * just initializing default_log_stream to stderr. This
-			 * ensures that we will always use the current value
-			 * of stderr, even if the application closes and
-			 * reopens it.
-			 */
-			f = stderr;
-		}
-	}
 
 	if (level > rte_logs.level)
 		return 0;

lib/librte_eal/common/include/rte_log.h

@@ -101,6 +101,19 @@ extern struct rte_logs rte_logs;
  */
 int rte_openlog_stream(FILE *f);
 
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Retrieve the stream used by the logging system (see rte_openlog_stream()
+ * to change it).
+ *
+ * @return
+ *   Pointer to the stream.
+ */
+__rte_experimental
+FILE *rte_log_get_stream(void);
+
 /**
  * Set the global log level.
  *

lib/librte_eal/rte_eal_version.map

@@ -417,4 +417,7 @@ EXPERIMENTAL {
 	rte_mcfg_timer_lock;
 	rte_mcfg_timer_unlock;
 	rte_rand_max;
+
+	# added in 19.11
+	rte_log_get_stream;
 };