[dpdk-dev] [PATCH (v20.11) 2/2] eventdev: reserve space in timer structs for extension

[pbhagavatula at marvell.com]

From: Pavan Nikhilesh <pbhagavatula at marvell.com>

The struct rte_event_timer_adapter and rte_event_timer_adapter_data are
supposed to be used internally only, but there is a chance that
increasing their size would break ABI for some applications.
In order to allow smooth addition of features without breaking
ABI compatibility, reserve some space.

Signed-off-by: Pavan Nikhilesh <pbhagavatula at marvell.com>
---
 lib/librte_eventdev/rte_event_timer_adapter.h     | 5 +++++
 lib/librte_eventdev/rte_event_timer_adapter_pmd.h | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/lib/librte_eventdev/rte_event_timer_adapter.h b/lib/librte_eventdev/rte_event_timer_adapter.h
index f83d85f4d..ce57a990a 100644
--- a/lib/librte_eventdev/rte_event_timer_adapter.h
+++ b/lib/librte_eventdev/rte_event_timer_adapter.h
@@ -529,6 +529,11 @@ struct rte_event_timer_adapter {
 	RTE_STD_C11
 	uint8_t allocated : 1;
 	/**< Flag to indicate that this adapter has been allocated */
+
+	uint64_t reserved_64s[4];
+	/**< Reserved for future fields */
+	void *reserved_ptrs[4];
+	/**< Reserved for future fields */
 } __rte_cache_aligned;
 
 #define ADAPTER_VALID_OR_ERR_RET(adapter, retval) do {		\
diff --git a/lib/librte_eventdev/rte_event_timer_adapter_pmd.h b/lib/librte_eventdev/rte_event_timer_adapter_pmd.h
index cf3509dc6..0a6682833 100644
--- a/lib/librte_eventdev/rte_event_timer_adapter_pmd.h
+++ b/lib/librte_eventdev/rte_event_timer_adapter_pmd.h
@@ -105,6 +105,11 @@ struct rte_event_timer_adapter_data {
 	RTE_STD_C11
 	uint8_t started : 1;
 	/**< Flag to indicate adapter started. */
+
+	uint64_t reserved_64s[4];
+	/**< Reserved for future fields */
+	void *reserved_ptrs[4];
+	/**< Reserved for future fields */
 } __rte_cache_aligned;
 
 #ifdef __cplusplus
-- 
2.17.1