[PATCH v4 2/3] timer: handle timers installed from non-EAL threads

[Erik Gabriel Carrillo <erik.g.carrillo@intel.com>]

From: Erik Carrillo <erik.g.carrillo@intel.com>

This commit adds support for timers being created from
non-EAL threads;  it maps timers from all such threads to
lcore id RTE_MAX_LCORE, and puts them all in a corresponding
skiplist.

Signed-off-by: Erik Gabriel Carrillo <erik.g.carrillo@intel.com>
---
v3:
* Rebased patch on reworked parent commit

v2:
* Address checkpatch warnings

 lib/librte_timer/rte_timer.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/lib/librte_timer/rte_timer.c b/lib/librte_timer/rte_timer.c
index 1f4141e..c489c5f 100644
--- a/lib/librte_timer/rte_timer.c
+++ b/lib/librte_timer/rte_timer.c
@@ -66,8 +66,8 @@ struct skiplist {
 } __rte_cache_aligned;
 
 struct priv_timer {
-	/** one pending list per enabled lcore */
-	struct skiplist pending_lists[RTE_MAX_LCORE];
+	/** one pending list per lcore, plus one for non-EAL threads */
+	struct skiplist pending_lists[RTE_MAX_LCORE + 1];
 	bool multi_pendlists;
 
 	/** per-core variable that true if a timer was updated on this
@@ -88,7 +88,7 @@ struct priv_timer {
 static struct priv_timer priv_timer[RTE_MAX_LCORE];
 
 /** cache of IDs of enabled lcores */
-static unsigned int enabled_lcores[RTE_MAX_LCORE];
+static unsigned int enabled_lcores[RTE_MAX_LCORE + 1];
 static int n_enabled_lcores;
 
 /* when debug is enabled, store some statistics */
@@ -114,12 +114,18 @@ rte_timer_subsystem_init(void)
 	RTE_LCORE_FOREACH(lcore_id)
 		enabled_lcores[n_enabled_lcores++] = lcore_id;
 
+	/* To handle timers coming from non-EAL threads */
+	enabled_lcores[n_enabled_lcores++] = RTE_MAX_LCORE;
+
 	/* since priv_timer is static, it's zeroed by default, so only init some
 	 * fields.
 	 */
 	for (i = 0; i < n_enabled_lcores; i++) {
 		lcore_id = enabled_lcores[i];
 
+		/* Don't use this value to index the priv_timer array */
+		if (lcore_id == RTE_MAX_LCORE)
+			continue;
 
 		priv_tim = &priv_timer[lcore_id];
 		priv_tim->prev_lcore = lcore_id;
@@ -343,7 +349,9 @@ timer_add(struct rte_timer *tim, unsigned int tim_lcore, int local_is_locked,
 	struct priv_timer *priv_tim = &priv_timer[tim_lcore];
 
 	if (priv_tim->multi_pendlists)
-		*pending_lists_idx = lcore_id;
+		/* Check if timer being installed from non-EAL thread */
+		*pending_lists_idx = (lcore_id == LCORE_ID_ANY) ?
+				RTE_MAX_LCORE : lcore_id;
 	else
 		*pending_lists_idx = SINGLE_LIST_IDX;
 
-- 
2.6.4