net/mlx5: FPGA, Call DMA unmap with the right size
authorIlya Lesokhin <ilyal@mellanox.com>
Mon, 28 Aug 2017 06:47:32 +0000 (09:47 +0300)
committerSaeed Mahameed <saeedm@mellanox.com>
Wed, 30 May 2018 00:27:50 +0000 (17:27 -0700)
When mlx5_fpga_conn_unmap_buf is called buf->sg[0].size
should equal the actual buffer size, not the message size.
Otherwise we will trigger the following dma debug warning
"DMA-API: device driver frees DMA memory with different size"

Fixes: 537a50574175 ('net/mlx5: FPGA, Add high-speed connection routines')
Signed-off-by: Ilya Lesokhin <ilyal@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
drivers/net/ethernet/mellanox/mlx5/core/fpga/conn.c

index bf84678b21d6214781fba64ca8b6c1c7d731e4ff..4138a770ed5713bf25e100754f3b693e5e212827 100644 (file)
@@ -256,8 +256,6 @@ static void mlx5_fpga_conn_rq_cqe(struct mlx5_fpga_conn *conn,
        ix = be16_to_cpu(cqe->wqe_counter) & (conn->qp.rq.size - 1);
        buf = conn->qp.rq.bufs[ix];
        conn->qp.rq.bufs[ix] = NULL;
-       if (!status)
-               buf->sg[0].size = be32_to_cpu(cqe->byte_cnt);
        conn->qp.rq.cc++;
 
        if (unlikely(status && (status != MLX5_CQE_SYNDROME_WR_FLUSH_ERR)))
@@ -275,6 +273,7 @@ static void mlx5_fpga_conn_rq_cqe(struct mlx5_fpga_conn *conn,
                return;
        }
 
+       buf->sg[0].size = be32_to_cpu(cqe->byte_cnt);
        mlx5_fpga_dbg(conn->fdev, "Message with %u bytes received successfully\n",
                      buf->sg[0].size);
        conn->recv_cb(conn->cb_arg, buf);