[dpdk-dev] [PATCH v2 3/5] cryptodev: move inline APIs into separate structure

[Akhil Goyal <gakhil@marvell.com>]

Move fastpath inline function pointers from rte_cryptodev into a
separate structure accessed via a flat array.
The intension is to make rte_cryptodev and related structures private
to avoid future API/ABI breakages.

Signed-off-by: Akhil Goyal <gakhil@marvell.com>
---
 lib/cryptodev/cryptodev_pmd.c      | 51 ++++++++++++++++++++++++++++++
 lib/cryptodev/cryptodev_pmd.h      | 11 +++++++
 lib/cryptodev/rte_cryptodev.c      | 29 +++++++++++++++++
 lib/cryptodev/rte_cryptodev_core.h | 29 +++++++++++++++++
 lib/cryptodev/version.map          |  5 +++
 5 files changed, 125 insertions(+)

diff --git a/lib/cryptodev/cryptodev_pmd.c b/lib/cryptodev/cryptodev_pmd.c
index 44a70ecb35..4646708045 100644
--- a/lib/cryptodev/cryptodev_pmd.c
+++ b/lib/cryptodev/cryptodev_pmd.c
@@ -4,6 +4,7 @@
 
 #include <sys/queue.h>
 
+#include <rte_errno.h>
 #include <rte_string_fns.h>
 #include <rte_malloc.h>
 
@@ -160,3 +161,53 @@ rte_cryptodev_pmd_destroy(struct rte_cryptodev *cryptodev)
 
 	return 0;
 }
+
+static uint16_t
+dummy_crypto_enqueue_burst(__rte_unused void *qp,
+			   __rte_unused struct rte_crypto_op **ops,
+			   __rte_unused uint16_t nb_ops)
+{
+	CDEV_LOG_ERR(
+		"crypto enqueue burst requested for unconfigured device");
+	rte_errno = ENOTSUP;
+	return 0;
+}
+
+static uint16_t
+dummy_crypto_dequeue_burst(__rte_unused void *qp,
+			   __rte_unused struct rte_crypto_op **ops,
+			   __rte_unused uint16_t nb_ops)
+{
+	CDEV_LOG_ERR(
+		"crypto dequeue burst requested for unconfigured device");
+	rte_errno = ENOTSUP;
+	return 0;
+}
+
+void
+cryptodev_fp_ops_reset(struct rte_crypto_fp_ops *fp_ops)
+{
+	static void *dummy_data[RTE_MAX_QUEUES_PER_PORT];
+	static const struct rte_crypto_fp_ops dummy = {
+		.enqueue_burst = dummy_crypto_enqueue_burst,
+		.dequeue_burst = dummy_crypto_dequeue_burst,
+		.qp = {
+			.data = dummy_data,
+			.enq_cb = dummy_data,
+			.deq_cb = dummy_data,
+		},
+	};
+
+	*fp_ops = dummy;
+}
+
+void
+cryptodev_fp_ops_set(struct rte_crypto_fp_ops *fp_ops,
+		     const struct rte_cryptodev *dev)
+{
+	fp_ops->enqueue_burst = dev->enqueue_burst;
+	fp_ops->dequeue_burst = dev->dequeue_burst;
+	fp_ops->qp.data = dev->data->queue_pairs;
+	fp_ops->qp.enq_cb = (void **)(uintptr_t)dev->enq_cbs;
+	fp_ops->qp.deq_cb = (void **)(uintptr_t)dev->deq_cbs;
+}
diff --git a/lib/cryptodev/cryptodev_pmd.h b/lib/cryptodev/cryptodev_pmd.h
index 36606dd10b..a71edbb991 100644
--- a/lib/cryptodev/cryptodev_pmd.h
+++ b/lib/cryptodev/cryptodev_pmd.h
@@ -516,6 +516,17 @@ RTE_INIT(init_ ##driver_id)\
 	driver_id = rte_cryptodev_allocate_driver(&crypto_drv, &(drv));\
 }
 
+/* Reset crypto device fastpath APIs to dummy values. */
+__rte_internal
+void
+cryptodev_fp_ops_reset(struct rte_crypto_fp_ops *fp_ops);
+
+/* Setup crypto device fastpath APIs. */
+__rte_internal
+void
+cryptodev_fp_ops_set(struct rte_crypto_fp_ops *fp_ops,
+		     const struct rte_cryptodev *dev);
+
 static inline void *
 get_sym_session_private_data(const struct rte_cryptodev_sym_session *sess,
 		uint8_t driver_id) {
diff --git a/lib/cryptodev/rte_cryptodev.c b/lib/cryptodev/rte_cryptodev.c
index eb86e629aa..2378892d40 100644
--- a/lib/cryptodev/rte_cryptodev.c
+++ b/lib/cryptodev/rte_cryptodev.c
@@ -53,6 +53,9 @@ static struct rte_cryptodev_global cryptodev_globals = {
 		.nb_devs		= 0
 };
 
+/* Public fastpath APIs. */
+struct rte_crypto_fp_ops rte_crypto_fp_ops[RTE_CRYPTO_MAX_DEVS];
+
 /* spinlock for crypto device callbacks */
 static rte_spinlock_t rte_cryptodev_cb_lock = RTE_SPINLOCK_INITIALIZER;
 
@@ -903,6 +906,16 @@ rte_cryptodev_pmd_allocate(const char *name, int socket_id)
 		cryptodev_globals.nb_devs++;
 	}
 
+	/*
+	 * for secondary process, at that point we expect device
+	 * to be already 'usable', so shared data and all function
+	 * pointers for fast-path devops have to be setup properly
+	 * inside rte_cryptodev.
+	 */
+	if (rte_eal_process_type() == RTE_PROC_SECONDARY)
+		cryptodev_fp_ops_set(rte_crypto_fp_ops +
+				cryptodev->data->dev_id, cryptodev);
+
 	return cryptodev;
 }
 
@@ -917,6 +930,8 @@ rte_cryptodev_pmd_release_device(struct rte_cryptodev *cryptodev)
 
 	dev_id = cryptodev->data->dev_id;
 
+	cryptodev_fp_ops_reset(rte_crypto_fp_ops + dev_id);
+
 	/* Close device only if device operations have been set */
 	if (cryptodev->dev_ops) {
 		ret = rte_cryptodev_close(dev_id);
@@ -1080,6 +1095,9 @@ rte_cryptodev_start(uint8_t dev_id)
 	}
 
 	diag = (*dev->dev_ops->dev_start)(dev);
+	/* expose selection of PMD fast-path functions */
+	cryptodev_fp_ops_set(rte_crypto_fp_ops + dev_id, dev);
+
 	rte_cryptodev_trace_start(dev_id, diag);
 	if (diag == 0)
 		dev->data->dev_started = 1;
@@ -1109,6 +1127,9 @@ rte_cryptodev_stop(uint8_t dev_id)
 		return;
 	}
 
+	/* point fast-path functions to dummy ones */
+	cryptodev_fp_ops_reset(rte_crypto_fp_ops + dev_id);
+
 	(*dev->dev_ops->dev_stop)(dev);
 	rte_cryptodev_trace_stop(dev_id);
 	dev->data->dev_started = 0;
@@ -2411,3 +2432,11 @@ rte_cryptodev_allocate_driver(struct cryptodev_driver *crypto_drv,
 
 	return nb_drivers++;
 }
+
+RTE_INIT(cryptodev_init_fp_ops)
+{
+	uint32_t i;
+
+	for (i = 0; i != RTE_DIM(rte_crypto_fp_ops); i++)
+		cryptodev_fp_ops_reset(rte_crypto_fp_ops + i);
+}
diff --git a/lib/cryptodev/rte_cryptodev_core.h b/lib/cryptodev/rte_cryptodev_core.h
index 1633e55889..bac5f8d984 100644
--- a/lib/cryptodev/rte_cryptodev_core.h
+++ b/lib/cryptodev/rte_cryptodev_core.h
@@ -25,6 +25,35 @@ typedef uint16_t (*enqueue_pkt_burst_t)(void *qp,
 		struct rte_crypto_op **ops,	uint16_t nb_ops);
 /**< Enqueue packets for processing on queue pair of a device. */
 
+/**
+ * @internal
+ * Structure used to hold opaque pointers to internal ethdev Rx/Tx
+ * queues data.
+ * The main purpose to expose these pointers at all - allow compiler
+ * to fetch this data for fast-path cryptodev inline functions in advance.
+ */
+struct rte_cryptodev_qpdata {
+	/** points to array of internal queue pair data pointers. */
+	void **data;
+	/** points to array of enqueue callback data pointers */
+	void **enq_cb;
+	/** points to array of dequeue callback data pointers */
+	void **deq_cb;
+};
+
+struct rte_crypto_fp_ops {
+	/** PMD enqueue burst function. */
+	enqueue_pkt_burst_t enqueue_burst;
+	/** PMD dequeue burst function. */
+	dequeue_pkt_burst_t dequeue_burst;
+	/** Internal queue pair data pointers. */
+	struct rte_cryptodev_qpdata qp;
+	/** Reserved for future ops. */
+	uintptr_t reserved[4];
+} __rte_cache_aligned;
+
+extern struct rte_crypto_fp_ops rte_crypto_fp_ops[RTE_CRYPTO_MAX_DEVS];
+
 /**
  * @internal
  * The data part, with no function pointers, associated with each device.
diff --git a/lib/cryptodev/version.map b/lib/cryptodev/version.map
index 43cf937e40..ed62ced221 100644
--- a/lib/cryptodev/version.map
+++ b/lib/cryptodev/version.map
@@ -45,6 +45,9 @@ DPDK_22 {
 	rte_cryptodev_sym_session_init;
 	rte_cryptodevs;
 
+	#added in 21.11
+	rte_crypto_fp_ops;
+
 	local: *;
 };
 
@@ -109,6 +112,8 @@ EXPERIMENTAL {
 INTERNAL {
 	global:
 
+	cryptodev_fp_ops_reset;
+	cryptodev_fp_ops_set;
 	rte_cryptodev_allocate_driver;
 	rte_cryptodev_pmd_allocate;
 	rte_cryptodev_pmd_callback_process;
-- 
2.25.1