diff mbox series

[v3,10/30] dma/dpaa2: limit the max descriptor number

Message ID 20240722163930.2171568-11-g.singh@nxp.com (mailing list archive)
State New
Delegated to: Thomas Monjalon
Headers
Series NXP DMA driver fixes and Enhancements |

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

Gagandeep Singh July 22, 2024, 4:39 p.m. UTC 
From: Jun Yang <jun.yang@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.yang@nxp.com>
---
 drivers/dma/dpaa2/dpaa2_qdma.h | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/drivers/dma/dpaa2/dpaa2_qdma.h b/drivers/dma/dpaa2/dpaa2_qdma.h
index 0be65e1cc6..250c83c83c 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);
 }