static int mlx5_fpga_conn_post_recv_buf(struct mlx5_fpga_conn *conn) { struct mlx5_fpga_dma_buf *buf; int err; buf = kzalloc(sizeof(*buf) + MLX5_FPGA_RECV_SIZE, 0); if (!buf) return -ENOMEM; buf->sg[0].data = (void *)(buf + 1); buf->sg[0].size = MLX5_FPGA_RECV_SIZE; buf->dma_dir = DMA_FROM_DEVICE; err = mlx5_fpga_conn_post_recv(conn, buf); if (err) kfree(buf); return err; }
static void mlx5_fpga_conn_rq_cqe(struct mlx5_fpga_conn *conn, struct mlx5_cqe64 *cqe, u8 status) { struct mlx5_fpga_dma_buf *buf; int ix, err; 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))) mlx5_fpga_warn(conn->fdev, "RQ buf %p on FPGA QP %u completion status %d\n", buf, conn->fpga_qpn, status); else mlx5_fpga_dbg(conn->fdev, "RQ buf %p on FPGA QP %u completion status %d\n", buf, conn->fpga_qpn, status); mlx5_fpga_conn_unmap_buf(conn, buf); if (unlikely(status || !conn->qp.active)) { conn->qp.active = false; kfree(buf); return; } mlx5_fpga_dbg(conn->fdev, "Message with %u bytes received successfully\n", buf->sg[0].size); conn->recv_cb(conn->cb_arg, buf); buf->sg[0].size = MLX5_FPGA_RECV_SIZE; err = mlx5_fpga_conn_post_recv(conn, buf); if (unlikely(err)) { mlx5_fpga_warn(conn->fdev, "Failed to re-post recv buf: %d\n", err); kfree(buf); } }