[dpdk-dev] [PATCH] net/mlx4: fix shifts of signed values

[Adrien Mazarguil]

This patch addresses the following issues reported by cppcheck:

 [drivers/net/mlx4/mlx4_rxtx.c:266]: (error) Shifting signed 32-bit value
     by 31 bits is undefined behaviour
 [drivers/net/mlx4/mlx4_rxtx.c:624]: (error) Shifting signed 32-bit value
     by 31 bits is undefined behaviour
 [drivers/net/mlx4/mlx4_txq.c:89]: (error) Shifting signed 32-bit value by
     31 bits is undefined behaviour
 [drivers/net/mlx4/mlx4_txq.c:91]: (error) Shifting signed 32-bit value by
     31 bits is undefined behaviour
Fixes: 78e81a9844f8 ("net/mlx4: merge Tx queue rings management")
Cc: sta...@dpdk.org
Cc: Matan Azrad <ma...@mellanox.com>

Reported-by: Ferruh Yigit <ferruh.yi...@intel.com>
Signed-off-by: Adrien Mazarguil <adrien.mazarg...@6wind.com>
---
 drivers/net/mlx4/mlx4_rxtx.c | 4 ++--
 drivers/net/mlx4/mlx4_txq.c  | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/mlx4/mlx4_rxtx.c b/drivers/net/mlx4/mlx4_rxtx.c
index 44efeb447..a92da66bd 100644
--- a/drivers/net/mlx4/mlx4_rxtx.c
+++ b/drivers/net/mlx4/mlx4_rxtx.c
@@ -263,7 +263,7 @@ mlx4_txq_stamp_freed_wqe(struct mlx4_sq *sq, volatile 
uint32_t *start,
                } while (start != (volatile uint32_t *)sq->eob);
                start = (volatile uint32_t *)sq->buf;
                /* Flip invalid stamping ownership. */
-               stamp ^= RTE_BE32(0x1 << MLX4_SQ_OWNER_BIT);
+               stamp ^= RTE_BE32(1u << MLX4_SQ_OWNER_BIT);
                sq->stamp = stamp;
                if (start == end)
                        return size;
@@ -621,7 +621,7 @@ mlx4_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, 
uint16_t pkts_n)
                        ctrl_next = (volatile struct mlx4_wqe_ctrl_seg *)
                                ((volatile uint8_t *)ctrl_next - sq->size);
                        /* Flip HW valid ownership. */
-                       sq->owner_opcode ^= 0x1 << MLX4_SQ_OWNER_BIT;
+                       sq->owner_opcode ^= 1u << MLX4_SQ_OWNER_BIT;
                }
                /*
                 * For raw Ethernet, the SOLICIT flag is used to indicate
diff --git a/drivers/net/mlx4/mlx4_txq.c b/drivers/net/mlx4/mlx4_txq.c
index a358732cc..6edaadbb6 100644
--- a/drivers/net/mlx4/mlx4_txq.c
+++ b/drivers/net/mlx4/mlx4_txq.c
@@ -86,9 +86,9 @@ mlx4_txq_fill_dv_obj_info(struct txq *txq, struct mlx4dv_obj 
*mlxdv)
        uint32_t headroom_size = 2048 + (1 << dqp->sq.wqe_shift);
        /* Continuous headroom size bytes must always stay freed. */
        sq->remain_size = sq->size - headroom_size;
-       sq->owner_opcode = MLX4_OPCODE_SEND | (0 << MLX4_SQ_OWNER_BIT);
+       sq->owner_opcode = MLX4_OPCODE_SEND | (0u << MLX4_SQ_OWNER_BIT);
        sq->stamp = rte_cpu_to_be_32(MLX4_SQ_STAMP_VAL |
-                                    (0 << MLX4_SQ_OWNER_BIT));
+                                    (0u << MLX4_SQ_OWNER_BIT));
        sq->db = dqp->sdb;
        sq->doorbell_qpn = dqp->doorbell_qpn;
        cq->buf = dcq->buf.buf;
-- 
2.11.0