[dpdk-dev] [PATCH] ethdev: reserve space in main structs for extension

[Thomas Monjalon <thomas@monjalon.net>]

The struct rte_eth_dev and rte_eth_dev_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, some space is reserved.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
---
 lib/librte_ethdev/rte_ethdev_core.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/librte_ethdev/rte_ethdev_core.h b/lib/librte_ethdev/rte_ethdev_core.h
index 392aea8e6b..ea8dd1d9ba 100644
--- a/lib/librte_ethdev/rte_ethdev_core.h
+++ b/lib/librte_ethdev/rte_ethdev_core.h
@@ -698,6 +698,9 @@ struct rte_eth_dev {
 	struct rte_eth_rxtx_callback *pre_tx_burst_cbs[RTE_MAX_QUEUES_PER_PORT];
 	enum rte_eth_dev_state state; /**< Flag indicating the port state */
 	void *security_ctx; /**< Context for security ops */
+
+	uint64_t reserved_64s[4]; /**< Reserved for future fields */
+	void *reserved_ptrs[4]; /**< Reserved for future fields */
 } __rte_cache_aligned;
 
 struct rte_eth_dev_sriov;
@@ -764,6 +767,9 @@ struct rte_eth_dev_data {
 			/**< Switch-specific identifier.
 			 *   Valid if RTE_ETH_DEV_REPRESENTOR in dev_flags.
 			 */
+
+	uint64_t reserved_64s[4]; /**< Reserved for future fields */
+	void *reserved_ptrs[4]; /**< Reserved for future fields */
 } __rte_cache_aligned;
 
 /**
-- 
2.23.0