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 48bebb2..80fe6a4 100644 (file)
--- 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 abc788c..de375ee 100644 (file)
--- 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_ */