[PATCH v1 1/3] cryptodev: add queue pair reset API

[Vidya Sagar Velumuri]

The API will reset the specific queue pair of a cryptodev.
The current API, cryptodev_queue_pair_setup(), requires the cryptodev
to be stopped before reconfiguring any queue pair. Stopping the
cryptodev in one thread can result in a segmentation fault when
multiple queues are used for enqueue and dequeue operations.

On supported PMDs, the cryptodev_queue_pair_reset() will
reconfigure/reset the queue pair without affecting other queues or
the cryptodev state.

The caller should ensure that there are no enqueue or dequeue operations
ongoing on that queue and that there are no inflight packets before
calling this API.

Signed-off-by: Vidya Sagar Velumuri <vvelumuri at marvell.com>

diff --git a/lib/cryptodev/cryptodev_pmd.h b/lib/cryptodev/cryptodev_pmd.h
index 6c114f7181..311ae63abb 100644
--- a/lib/cryptodev/cryptodev_pmd.h
+++ b/lib/cryptodev/cryptodev_pmd.h
@@ -290,6 +290,22 @@ typedef int (*cryptodev_queue_pair_setup_t)(struct rte_cryptodev *dev,
 typedef int (*cryptodev_queue_pair_release_t)(struct rte_cryptodev *dev,
 		uint16_t qp_id);
 
+/**
+ * Reset or reconfigure a queue pair for a device.
+ *
+ * @param	dev		Crypto device pointer
+ * @param	qp_id		Queue pair index
+ * @param	qp_conf		Queue configuration structure
+ * @param	socket_id	Socket index
+ *
+ * @return
+ *  - 0: on success.
+ *  - ENOTSUP: if crypto device does not support the operation.
+ */
+typedef int (*cryptodev_queue_pair_reset_t)(struct rte_cryptodev *dev,
+		uint16_t qp_id,	const struct rte_cryptodev_qp_conf *qp_conf,
+		int socket_id);
+
 /**
  * Create a session mempool to allocate sessions from
  *
@@ -476,6 +492,8 @@ struct rte_cryptodev_ops {
 	/**< Set up a device queue pair. */
 	cryptodev_queue_pair_release_t queue_pair_release;
 	/**< Release a queue pair. */
+	cryptodev_queue_pair_reset_t queue_pair_reset;
+	/**< Reset a queue pair. */
 
 	cryptodev_sym_get_session_private_size_t sym_session_get_size;
 	/**< Return private session. */
diff --git a/lib/cryptodev/cryptodev_trace.h b/lib/cryptodev/cryptodev_trace.h
index 935f0d564b..633f17afe1 100644
--- a/lib/cryptodev/cryptodev_trace.h
+++ b/lib/cryptodev/cryptodev_trace.h
@@ -58,6 +58,16 @@ RTE_TRACE_POINT(
 	rte_trace_point_emit_ptr(conf->mp_session);
 )
 
+RTE_TRACE_POINT(
+	rte_cryptodev_trace_queue_pair_reset,
+	RTE_TRACE_POINT_ARGS(uint8_t dev_id, uint16_t queue_pair_id,
+		const struct rte_cryptodev_qp_conf *conf, int socket_id),
+	rte_trace_point_emit_u8(dev_id);
+	rte_trace_point_emit_u16(queue_pair_id);
+	rte_trace_point_emit_u32(conf->nb_descriptors);
+	rte_trace_point_emit_int(socket_id);
+)
+
 RTE_TRACE_POINT(
 	rte_cryptodev_trace_sym_session_pool_create,
 	RTE_TRACE_POINT_ARGS(const char *name, uint32_t nb_elts,
diff --git a/lib/cryptodev/cryptodev_trace_points.c b/lib/cryptodev/cryptodev_trace_points.c
index 7403412553..6f37780595 100644
--- a/lib/cryptodev/cryptodev_trace_points.c
+++ b/lib/cryptodev/cryptodev_trace_points.c
@@ -21,6 +21,9 @@ RTE_TRACE_POINT_REGISTER(rte_cryptodev_trace_close,
 RTE_TRACE_POINT_REGISTER(rte_cryptodev_trace_queue_pair_setup,
 	lib.cryptodev.queue.pair.setup)
 
+RTE_TRACE_POINT_REGISTER(rte_cryptodev_trace_queue_pair_reset,
+	lib.cryptodev.queue.pair.reset)
+
 RTE_TRACE_POINT_REGISTER(rte_cryptodev_trace_sym_session_pool_create,
 	lib.cryptodev.sym.pool.create)
 
diff --git a/lib/cryptodev/rte_cryptodev.c b/lib/cryptodev/rte_cryptodev.c
index 682c9f49d0..281ca51cf3 100644
--- a/lib/cryptodev/rte_cryptodev.c
+++ b/lib/cryptodev/rte_cryptodev.c
@@ -1222,6 +1222,30 @@ rte_cryptodev_queue_pairs_config(struct rte_cryptodev *dev, uint16_t nb_qpairs,
 	return 0;
 }
 
+int
+rte_cryptodev_queue_pair_reset(uint8_t dev_id, uint16_t queue_pair_id,
+		const struct rte_cryptodev_qp_conf *qp_conf, int socket_id)
+{
+	struct rte_cryptodev *dev;
+
+	if (!rte_cryptodev_is_valid_dev(dev_id)) {
+		CDEV_LOG_ERR("Invalid dev_id=%" PRIu8, dev_id);
+		return -EINVAL;
+	}
+
+	dev = &rte_crypto_devices[dev_id];
+	if (queue_pair_id >= dev->data->nb_queue_pairs) {
+		CDEV_LOG_ERR("Invalid queue_pair_id=%d", queue_pair_id);
+		return -EINVAL;
+	}
+
+	if (*dev->dev_ops->queue_pair_reset == NULL)
+		return -ENOTSUP;
+
+	rte_cryptodev_trace_queue_pair_reset(dev_id, queue_pair_id, qp_conf, socket_id);
+	return (*dev->dev_ops->queue_pair_reset)(dev, queue_pair_id, qp_conf, socket_id);
+}
+
 int
 rte_cryptodev_configure(uint8_t dev_id, struct rte_cryptodev_config *config)
 {
diff --git a/lib/cryptodev/rte_cryptodev.h b/lib/cryptodev/rte_cryptodev.h
index bec947f6d5..e0fc35db2a 100644
--- a/lib/cryptodev/rte_cryptodev.h
+++ b/lib/cryptodev/rte_cryptodev.h
@@ -840,6 +840,35 @@ int
 rte_cryptodev_queue_pair_setup(uint8_t dev_id, uint16_t queue_pair_id,
 		const struct rte_cryptodev_qp_conf *qp_conf, int socket_id);
 
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice.
+ *
+ * Reset a queue pair for a device.
+ * The caller of this API must ensure that, there are no enqueues to the queue and there are no
+ * pending/inflight packets in the queue when the API is called.
+ * The API can reconfigure the queue pair when the queue pair configuration data is provided.
+ *
+ * @param	dev_id		The identifier of the device.
+ * @param	queue_pair_id	The index of the queue pairs to set up. The value must be in the
+ *				range [0, nb_queue_pair - 1] previously supplied to
+ *				rte_cryptodev_configure().
+ * @param	qp_conf		The pointer to configuration data to be used for the queue pair.
+ *				It should be NULL, if the API is called from an interrupt context.
+ * @param	socket_id	The *socket_id* argument is the socket identifier in case of NUMA.
+ *				The value can be *SOCKET_ID_ANY* if there is no NUMA constraint
+ *				for the DMA memory allocated for the queue pair.
+ *
+ * @return
+ *   - 0:  Queue pair is reset successfully.
+ *   - ENOTSUP: If the operation is not supported by the PMD.
+ *   - <0: Queue pair reset failed
+ */
+__rte_experimental
+int
+rte_cryptodev_queue_pair_reset(uint8_t dev_id, uint16_t queue_pair_id,
+		const struct rte_cryptodev_qp_conf *qp_conf, int socket_id);
+
 /**
  * Get the status of queue pairs setup on a specific crypto device
  *
diff --git a/lib/cryptodev/version.map b/lib/cryptodev/version.map
index fdac0d876e..eec06d9939 100644
--- a/lib/cryptodev/version.map
+++ b/lib/cryptodev/version.map
@@ -87,6 +87,9 @@ EXPERIMENTAL {
 
 	# added in 24.03
 	__rte_cryptodev_trace_qp_depth_used;
+
+	# added in 24.07
+	rte_cryptodev_queue_pair_reset;
 };
 
 INTERNAL {
-- 
2.25.1