From: Ravi Kumar <ravi1.kumar@amd.com>
Date: Mon, 19 Mar 2018 12:23:43 +0000 (-0400)
Subject: crypto/ccp: support hwrng
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=585d40375a55a204cc739ab43d4e54dc314a2fa2;p=dpdk.git

crypto/ccp: support hwrng

CCP engines support true hardware random generation feature.
This patch implements api to read random number from CCP to be
used within PMD.

Signed-off-by: Ravi Kumar <ravi1.kumar@amd.com>
---

diff --git a/drivers/crypto/ccp/ccp_dev.c b/drivers/crypto/ccp/ccp_dev.c
index 48bebb289e..80fe6a4533 100644
--- a/drivers/crypto/ccp/ccp_dev.c
+++ b/drivers/crypto/ccp/ccp_dev.c
@@ -62,6 +62,26 @@ ccp_allot_queue(struct rte_cryptodev *cdev, int slot_req)
 	return NULL;
 }
 
+int
+ccp_read_hwrng(uint32_t *value)
+{
+	struct ccp_device *dev;
+
+	TAILQ_FOREACH(dev, &ccp_list, next) {
+		void *vaddr = (void *)(dev->pci.mem_resource[2].addr);
+
+		while (dev->hwrng_retries++ < CCP_MAX_TRNG_RETRIES) {
+			*value = CCP_READ_REG(vaddr, TRNG_OUT_REG);
+			if (*value) {
+				dev->hwrng_retries = 0;
+				return 0;
+			}
+		}
+		dev->hwrng_retries = 0;
+	}
+	return -1;
+}
+
 static const struct rte_memzone *
 ccp_queue_dma_zone_reserve(const char *queue_name,
 			   uint32_t queue_size,
diff --git a/drivers/crypto/ccp/ccp_dev.h b/drivers/crypto/ccp/ccp_dev.h
index abc788cc11..de375ee8a6 100644
--- a/drivers/crypto/ccp/ccp_dev.h
+++ b/drivers/crypto/ccp/ccp_dev.h
@@ -21,6 +21,7 @@
 
 /**< CCP sspecific */
 #define MAX_HW_QUEUES                   5
+#define CCP_MAX_TRNG_RETRIES		10
 
 /**< CCP Register Mappings */
 #define Q_MASK_REG                      0x000
@@ -197,6 +198,8 @@ struct ccp_device {
 	/**< protection for shared lsb region allocation */
 	int qidx;
 	/**< current queue index */
+	int hwrng_retries;
+	/**< retry counter for CCP TRNG */
 } __rte_cache_aligned;
 
 /**< CCP H/W engine related */
@@ -428,4 +431,12 @@ int ccp_probe_devices(const struct rte_pci_id *ccp_id);
  */
 struct ccp_queue *ccp_allot_queue(struct rte_cryptodev *dev, int slot_req);
 
+/**
+ * read hwrng value
+ *
+ * @param trng_value data pointer to write RNG value
+ * @return 0 on success otherwise -1
+ */
+int ccp_read_hwrng(uint32_t *trng_value);
+
 #endif /* _CCP_DEV_H_ */