static ssize_t debugfs_read()

in ntb_transport.c [463:554]

• 83 lines of code
• 8 McCabe index (conditional complexity)

static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count,
			    loff_t *offp)
{
	struct ntb_transport_qp *qp;
	char *buf;
	ssize_t ret, out_offset, out_count;

	qp = filp->private_data;

	if (!qp || !qp->link_is_up)
		return 0;

	out_count = 1000;

	buf = kmalloc(out_count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	out_offset = 0;
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "\nNTB QP stats:\n\n");
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "rx_bytes - \t%llu\n", qp->rx_bytes);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "rx_pkts - \t%llu\n", qp->rx_pkts);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "rx_memcpy - \t%llu\n", qp->rx_memcpy);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "rx_async - \t%llu\n", qp->rx_async);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "rx_ring_empty - %llu\n", qp->rx_ring_empty);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "rx_err_no_buf - %llu\n", qp->rx_err_no_buf);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "rx_err_oflow - \t%llu\n", qp->rx_err_oflow);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "rx_err_ver - \t%llu\n", qp->rx_err_ver);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "rx_buff - \t0x%p\n", qp->rx_buff);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "rx_index - \t%u\n", qp->rx_index);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "rx_max_entry - \t%u\n", qp->rx_max_entry);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "rx_alloc_entry - \t%u\n\n", qp->rx_alloc_entry);

	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "tx_bytes - \t%llu\n", qp->tx_bytes);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "tx_pkts - \t%llu\n", qp->tx_pkts);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "tx_memcpy - \t%llu\n", qp->tx_memcpy);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "tx_async - \t%llu\n", qp->tx_async);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "tx_ring_full - \t%llu\n", qp->tx_ring_full);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "tx_err_no_buf - %llu\n", qp->tx_err_no_buf);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "tx_mw - \t0x%p\n", qp->tx_mw);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "tx_index (H) - \t%u\n", qp->tx_index);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "RRI (T) - \t%u\n",
			       qp->remote_rx_info->entry);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "tx_max_entry - \t%u\n", qp->tx_max_entry);
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "free tx - \t%u\n",
			       ntb_transport_tx_free_entry(qp));

	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "\n");
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "Using TX DMA - \t%s\n",
			       qp->tx_dma_chan ? "Yes" : "No");
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "Using RX DMA - \t%s\n",
			       qp->rx_dma_chan ? "Yes" : "No");
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "QP Link - \t%s\n",
			       qp->link_is_up ? "Up" : "Down");
	out_offset += scnprintf(buf + out_offset, out_count - out_offset,
			       "\n");

	if (out_offset > out_count)
		out_offset = out_count;

	ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
	kfree(buf);
	return ret;
}