[PATCH v5] eventdev/crypto: restore opaque field between dequeue and enqueue

[Ganapati Kundapura <ganapati.kundapura@intel.com>]

For session-less crypto operations, event info is contained in
crypto op metadata for each event which is restored in event
from the crypto op metadata response info.

For session based crypto operations, crypto op contains per session
based event info in crypto op metadata. If any PMD passes any
implementation specific data in "struct rte_event::impl_opaque"
on each event, it's not getting restored.

This patch stores "struct rte_event::impl_opaque" in mbuf dynamic
field before enqueueing to cryptodev and restores
"struct rte_event::impl_opaque" from mbuf dynamic field after
dequeueing crypto op from cryptodev for session based crypto operations.

Fixes: 7901eac3409a ("eventdev: add crypto adapter implementation")

Acked-by: Abhinandan Gujjar <abhinandan.gujjar@intel.com>

Signed-off-by: Ganapati Kundapura <ganapati.kundapura@intel.com>

---
v5:
* Replaced ev::impl_opaque with "struct rte_event::impl_opaque"
* in eca_init_service()

v4:
* Replaced ev::impl_opaque with "struct rte_event::impl_opaque"
* Added Acked-by

v3:
* Added Fixes tag

v2:
* Fixed TYPO_SPELLING warning in commit header

diff --git a/lib/eventdev/rte_event_crypto_adapter.c b/lib/eventdev/rte_event_crypto_adapter.c
index db1c7f3..939ca1c 100644
--- a/lib/eventdev/rte_event_crypto_adapter.c
+++ b/lib/eventdev/rte_event_crypto_adapter.c
@@ -138,6 +138,28 @@ static struct event_crypto_adapter **event_crypto_adapter;
 	} \
 } while (0)
 
+#define ECA_DYNFIELD_NAME "eca_ev_opaque_data"
+/* Device-specific metadata field type */
+typedef uint8_t eca_dynfield_t;
+
+/* mbuf dynamic field offset for device-specific metadata */
+int eca_dynfield_offset = -1;
+
+static int
+eca_dynfield_register(void)
+{
+	static const struct rte_mbuf_dynfield eca_dynfield_desc = {
+		.name = ECA_DYNFIELD_NAME,
+		.size = sizeof(eca_dynfield_t),
+		.align = alignof(eca_dynfield_t),
+		.flags = 0,
+	};
+
+	eca_dynfield_offset =
+		rte_mbuf_dynfield_register(&eca_dynfield_desc);
+	return eca_dynfield_offset;
+}
+
 static inline int
 eca_valid_id(uint8_t id)
 {
@@ -491,6 +513,25 @@ eca_enq_to_cryptodev(struct event_crypto_adapter *adapter, struct rte_event *ev,
 		crypto_op = ev[i].event_ptr;
 		if (crypto_op == NULL)
 			continue;
+
+		/** "struct rte_event::impl_opaque" field passed on from
+		 *  eventdev PMD could have different value per event.
+		 *  For session-based crypto operations retain
+		 *  "struct rte_event::impl_opaque" into mbuf dynamic field and
+		 *  restore it back after copying event information from
+		 *  session event metadata.
+		 *  For session-less, each crypto operation carries event
+		 *  metadata and retains "struct rte_event:impl_opaque"
+		 *  information to be passed back to eventdev PMD.
+		 */
+		if (crypto_op->sess_type == RTE_CRYPTO_OP_WITH_SESSION) {
+			struct rte_mbuf *mbuf = crypto_op->sym->m_src;
+
+			*RTE_MBUF_DYNFIELD(mbuf,
+					eca_dynfield_offset,
+					eca_dynfield_t *) = ev[i].impl_opaque;
+		}
+
 		m_data = rte_cryptodev_session_event_mdata_get(crypto_op);
 		if (m_data == NULL) {
 			rte_pktmbuf_free(crypto_op->sym->m_src);
@@ -657,6 +698,21 @@ eca_ops_enqueue_burst(struct event_crypto_adapter *adapter,
 
 		rte_memcpy(ev, &m_data->response_info, sizeof(*ev));
 		ev->event_ptr = ops[i];
+
+		/** Restore "struct rte_event::impl_opaque" from mbuf
+		 *  dynamic field for session based crypto operation.
+		 *  For session-less, each crypto operations carries event
+		 *  metadata and retains "struct rte_event::impl_opaque"
+		 *  information to be passed back to eventdev PMD.
+		 */
+		if (ops[i]->sess_type == RTE_CRYPTO_OP_WITH_SESSION) {
+			struct rte_mbuf *mbuf = ops[i]->sym->m_src;
+
+			ev->impl_opaque = *RTE_MBUF_DYNFIELD(mbuf,
+							eca_dynfield_offset,
+							eca_dynfield_t *);
+		}
+
 		ev->event_type = RTE_EVENT_TYPE_CRYPTODEV;
 		if (adapter->implicit_release_disabled)
 			ev->op = RTE_EVENT_OP_FORWARD;
@@ -895,6 +951,18 @@ eca_init_service(struct event_crypto_adapter *adapter, uint8_t id)
 	}
 
 	adapter->implicit_release_disabled = (uint8_t)impl_rel;
+
+	/** Register for mbuf dyn field to store/restore
+	 *  "struct rte_event::impl_opaque"
+	 */
+	eca_dynfield_offset = eca_dynfield_register();
+	if (eca_dynfield_offset  < 0) {
+		RTE_EDEV_LOG_ERR("Failed to register eca mbuf dyn field");
+		eca_circular_buffer_free(&adapter->ebuf);
+		rte_free(adapter);
+		return -EINVAL;
+	}
+
 	adapter->service_inited = 1;
 
 	return ret;
-- 
2.6.4