[PATCH] cryptodev: add a simple mapping cache to speed up ops pool create

[Andrew Boyer <andrew.boyer@amd.com>]

Cache the most recent VA -> PA mapping found so that we can skip
most of the system calls. With 4K pages this reduces pool create
time by about 90%.

Signed-off-by: Andrew Boyer <andrew.boyer@amd.com>
---
 lib/cryptodev/rte_crypto.h    |  5 +++++
 lib/cryptodev/rte_cryptodev.c | 23 ++++++++++++++++++++++-
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/lib/cryptodev/rte_crypto.h b/lib/cryptodev/rte_crypto.h
index dbc2700da5..ee6aa1e40e 100644
--- a/lib/cryptodev/rte_crypto.h
+++ b/lib/cryptodev/rte_crypto.h
@@ -220,6 +220,11 @@ struct rte_crypto_op_pool_private {
 	/**< Crypto op pool type operation. */
 	uint16_t priv_size;
 	/**< Size of private area in each crypto operation. */
+
+	unsigned long vp_cache;
+	/* Virtual page address of previous op. */
+	rte_iova_t iovp_cache;
+	/* I/O virtual page address of previous op. */
 };
 
 
diff --git a/lib/cryptodev/rte_cryptodev.c b/lib/cryptodev/rte_cryptodev.c
index b233c0ecd7..d596f85a57 100644
--- a/lib/cryptodev/rte_cryptodev.c
+++ b/lib/cryptodev/rte_cryptodev.c
@@ -10,6 +10,7 @@
 #include <errno.h>
 #include <stdint.h>
 #include <inttypes.h>
+#include <unistd.h>
 
 #include <rte_log.h>
 #include <rte_debug.h>
@@ -2568,12 +2569,32 @@ rte_crypto_op_init(struct rte_mempool *mempool,
 {
 	struct rte_crypto_op *op = _op_data;
 	enum rte_crypto_op_type type = *(enum rte_crypto_op_type *)opaque_arg;
+	struct rte_crypto_op_pool_private *priv;
+	unsigned long virt_addr = (unsigned long)(uintptr_t)_op_data;
+#ifdef RTE_EXEC_ENV_WINDOWS
+	unsigned long page_mask = 4095;
+#else
+	unsigned long page_mask = sysconf(_SC_PAGESIZE) - 1;
+#endif
+	unsigned long virt_page = virt_addr & ~page_mask;
 
 	memset(_op_data, 0, mempool->elt_size);
 
 	__rte_crypto_op_reset(op, type);
 
-	op->phys_addr = rte_mem_virt2iova(_op_data);
+	priv = (struct rte_crypto_op_pool_private *)
+		rte_mempool_get_priv(mempool);
+
+	if (virt_page == priv->vp_cache) {
+		op->phys_addr = priv->iovp_cache + (virt_addr & page_mask);
+	} else {
+		op->phys_addr = rte_mem_virt2iova(_op_data);
+
+		/* Update cached values */
+		priv->vp_cache = virt_page;
+		priv->iovp_cache = op->phys_addr & ~page_mask;
+	}
+
 	op->mempool = mempool;
 }
 
-- 
2.17.1