[dpdk-dev] [PATCH 6/8] trace: remove limitation on patterns number

[David Marchand <david.marchand@redhat.com>]

There is nothing performance sensitive in this list, use dynamic
allocations and remove the arbitrary limit on the number of trace
patterns a user can pass.

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 lib/librte_eal/common/eal_common_trace.c      | 10 +++---
 .../common/eal_common_trace_utils.c           | 33 ++++++++-----------
 lib/librte_eal/common/eal_trace.h             |  8 ++---
 3 files changed, 23 insertions(+), 28 deletions(-)

diff --git a/lib/librte_eal/common/eal_common_trace.c b/lib/librte_eal/common/eal_common_trace.c
index 5a365c61da..875553d7e5 100644
--- a/lib/librte_eal/common/eal_common_trace.c
+++ b/lib/librte_eal/common/eal_common_trace.c
@@ -21,7 +21,7 @@ static RTE_DEFINE_PER_LCORE(char, ctf_field[TRACE_CTF_FIELD_SIZE]);
 static RTE_DEFINE_PER_LCORE(int, ctf_count);
 
 static struct trace_point_head tp_list = STAILQ_HEAD_INITIALIZER(tp_list);
-static struct trace trace;
+static struct trace trace = { .args = STAILQ_HEAD_INITIALIZER(trace.args), };
 
 struct trace *
 trace_obj_get(void)
@@ -38,7 +38,7 @@ trace_list_head_get(void)
 int
 eal_trace_init(void)
 {
-	uint8_t i;
+	struct trace_arg *arg;
 
 	/* Trace memory should start with 8B aligned for natural alignment */
 	RTE_BUILD_BUG_ON((offsetof(struct __rte_trace_header, mem) % 8) != 0);
@@ -49,7 +49,7 @@ eal_trace_init(void)
 		goto fail;
 	}
 
-	if (trace.args.nb_args)
+	if (!STAILQ_EMPTY(&trace.args))
 		trace.status = true;
 
 	if (!rte_trace_is_enabled())
@@ -82,8 +82,8 @@ eal_trace_init(void)
 		goto fail;
 
 	/* Apply global configurations */
-	for (i = 0; i < trace.args.nb_args; i++)
-		trace_args_apply(trace.args.args[i]);
+	STAILQ_FOREACH(arg, &trace.args, next)
+		trace_args_apply(arg->val);
 
 	rte_trace_mode_set(trace.mode);
 
diff --git a/lib/librte_eal/common/eal_common_trace_utils.c b/lib/librte_eal/common/eal_common_trace_utils.c
index 4077acf428..15384ce4f1 100644
--- a/lib/librte_eal/common/eal_common_trace_utils.c
+++ b/lib/librte_eal/common/eal_common_trace_utils.c
@@ -138,25 +138,20 @@ int
 eal_trace_args_save(const char *val)
 {
 	struct trace *trace = trace_obj_get();
-	char *trace_args;
-	uint8_t nb_args;
+	struct trace_arg *arg = malloc(sizeof(*arg));
 
-	nb_args = trace->args.nb_args;
-
-	if (nb_args >= TRACE_MAX_ARGS) {
-		trace_err("ignoring trace %s as limit exceeds", val);
-		return 0;
+	if (arg == NULL) {
+		trace_err("failed to allocate memory for %s", val);
+		return -ENOMEM;
 	}
 
-	trace_args = calloc(1, (strlen(val) + 1));
-	if (trace_args == NULL) {
-		trace_err("fail to allocate memory for %s", val);
+	arg->val = strdup(val);
+	if (arg->val == NULL) {
+		trace_err("failed to allocate memory for %s", val);
 		return -ENOMEM;
 	}
 
-	memcpy(trace_args, val, strlen(val));
-	trace->args.args[nb_args++] = trace_args;
-	trace->args.nb_args = nb_args;
+	STAILQ_INSERT_TAIL(&trace->args, arg, next);
 	return 0;
 }
 
@@ -164,13 +159,13 @@ void
 eal_trace_args_free(void)
 {
 	struct trace *trace = trace_obj_get();
-	int i;
+	struct trace_arg *arg;
 
-	for (i = 0; i < trace->args.nb_args; i++) {
-		if (trace->args.args[i]) {
-			free((void *)trace->args.args[i]);
-			trace->args.args[i] = NULL;
-		}
+	while (!STAILQ_EMPTY(&trace->args)) {
+		arg = STAILQ_FIRST(&trace->args);
+		STAILQ_REMOVE_HEAD(&trace->args, next);
+		free(arg->val);
+		free(arg);
 	}
 }
 
diff --git a/lib/librte_eal/common/eal_trace.h b/lib/librte_eal/common/eal_trace.h
index 7d95bd2aa9..943b5ecbc5 100644
--- a/lib/librte_eal/common/eal_trace.h
+++ b/lib/librte_eal/common/eal_trace.h
@@ -46,9 +46,9 @@ struct thread_mem_meta {
 	enum trace_area_e area;
 };
 
-struct trace_args {
-	uint8_t nb_args;
-	char *args[TRACE_MAX_ARGS];
+struct trace_arg {
+	STAILQ_ENTRY(trace_arg) next;
+	char *val;
 };
 
 struct trace {
@@ -59,7 +59,7 @@ struct trace {
 	enum rte_trace_mode mode;
 	rte_uuid_t uuid;
 	uint32_t buff_len;
-	struct trace_args args;
+	STAILQ_HEAD(trace_arg_head, trace_arg) args;
 	uint32_t nb_trace_points;
 	uint32_t nb_trace_mem_list;
 	struct thread_mem_meta *lcore_meta;
-- 
2.23.0