net/mlx5: fix secondary process Tx error

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 objects")

Signed-off-by: Xueming Li <xuemingl@mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>

diff --git a/drivers/net/mlx5/mlx5_txq.c b/drivers/net/mlx5/mlx5_txq.c
index 9deaa7e..3d5f033 100644 (file)
--- 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);