[dpdk-dev] [PATCH] net/mlx5: fix secondary process TX error

[Xueming Li]

Uninitialized UAR mmap offset caused secondary tx doorbell mapped to
wrong address. This patch restores missing UAR mmap offset init code
overridden by wrong merge.

Fixes: faf2667fe8d5 ("net/mlx5: separate DPDK from verbs Tx queue ...")

Signed-off-by: Xueming Li <xuemi...@mellanox.com>
---
 drivers/net/mlx5/mlx5_txq.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_txq.c b/drivers/net/mlx5/mlx5_txq.c
index 9deaa7ea3..290e614dc 100644
--- a/drivers/net/mlx5/mlx5_txq.c
+++ b/drivers/net/mlx5/mlx5_txq.c
@@ -303,7 +303,7 @@ mlx5_priv_txq_ibv_new(struct priv *priv, uint16_t idx)
                struct ibv_cq_ex cq_attr;
        } attr;
        unsigned int cqe_n;
-       struct mlx5dv_qp qp;
+       struct mlx5dv_qp qp = {.comp_mask = MLX5DV_QP_MASK_UAR_MMAP_OFFSET};
        struct mlx5dv_cq cq_info;
        struct mlx5dv_obj obj;
        const int desc = 1 << txq_data->elts_n;
@@ -429,6 +429,12 @@ mlx5_priv_txq_ibv_new(struct priv *priv, uint16_t idx)
        txq_ibv->qp = tmpl.qp;
        txq_ibv->cq = tmpl.cq;
        rte_atomic32_inc(&txq_ibv->refcnt);
+       if (qp.comp_mask | MLX5DV_QP_MASK_UAR_MMAP_OFFSET) {
+               txq_ctrl->uar_mmap_offset = qp.uar_mmap_offset;
+       } else {
+               ERROR("Failed to retrieve UAR info, invalid libmlx5.so 
version");
+               goto error;
+       }
        DEBUG("%p: Verbs Tx queue %p: refcnt %d", (void *)priv,
              (void *)txq_ibv, rte_atomic32_read(&txq_ibv->refcnt));
        LIST_INSERT_HEAD(&priv->txqsibv, txq_ibv, next);
-- 
2.13.3