[PATCH 10/30] dma/dpaa2: limit the max descriptor number

[Gagandeep Singh]

From: Jun Yang <jun.y...@nxp.com>

For non-SG format, the index is saved in FD with
DPAA2_QDMA_FD_ATT_TYPE_OFFSET(13) bits width.

The max descriptor number of ring is power of 2, so the
eventual max number is:
((1 << DPAA2_QDMA_FD_ATT_TYPE_OFFSET) / 2)

Signed-off-by: Jun Yang <jun.y...@nxp.com>
---
 drivers/dma/dpaa2/dpaa2_qdma.h | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/dpaa2/dpaa2_qdma.h b/drivers/dma/dpaa2/dpaa2_qdma.h
index 252d2b1c74..1a4b611c08 100644
--- a/drivers/dma/dpaa2/dpaa2_qdma.h
+++ b/drivers/dma/dpaa2/dpaa2_qdma.h
@@ -8,8 +8,6 @@
 #include "portal/dpaa2_hw_pvt.h"
 #include "portal/dpaa2_hw_dpio.h"
 
-#define DPAA2_QDMA_MAX_DESC            4096
-#define DPAA2_QDMA_MIN_DESC            1
 #define DPAA2_QDMA_MAX_VHANS           64
 
 #define DPAA2_DPDMAI_MAX_QUEUES        16
@@ -169,10 +167,15 @@ enum dpaa2_qdma_fd_type {
 };
 
 #define DPAA2_QDMA_FD_ATT_TYPE_OFFSET 13
+#define DPAA2_QDMA_FD_ATT_MAX_IDX \
+       ((1 << DPAA2_QDMA_FD_ATT_TYPE_OFFSET) - 1)
 #define DPAA2_QDMA_FD_ATT_TYPE(att) \
        (att >> DPAA2_QDMA_FD_ATT_TYPE_OFFSET)
 #define DPAA2_QDMA_FD_ATT_CNTX(att) \
-       (att & ((1 << DPAA2_QDMA_FD_ATT_TYPE_OFFSET) - 1))
+       (att & DPAA2_QDMA_FD_ATT_MAX_IDX)
+
+#define DPAA2_QDMA_MAX_DESC ((DPAA2_QDMA_FD_ATT_MAX_IDX + 1) / 2)
+#define DPAA2_QDMA_MIN_DESC 1
 
 static inline void
 dpaa2_qdma_fd_set_addr(struct qbman_fd *fd,
@@ -186,6 +189,7 @@ static inline void
 dpaa2_qdma_fd_save_att(struct qbman_fd *fd,
        uint16_t job_idx, enum dpaa2_qdma_fd_type type)
 {
+       RTE_ASSERT(job_idx <= DPAA2_QDMA_FD_ATT_MAX_IDX);
        fd->simple_ddr.rsv1_att = job_idx |
                (type << DPAA2_QDMA_FD_ATT_TYPE_OFFSET);
 }
-- 
2.25.1