static int
mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
struct mlx4_en_rx_ring *ring, int index)
{
struct mlx4_en_rx_desc *rx_desc = (struct mlx4_en_rx_desc *)
(ring->buf + (index * ring->stride));
struct mlx4_en_rx_mbuf *mb_list = ring->mbuf + index;
mb_list->mbuf = NULL;
if (mlx4_en_alloc_buf(ring, &rx_desc->data[0].addr, mb_list)) {
priv->port_stats.rx_alloc_failed++;
return (-ENOMEM);
}
return (0);
}
/* Unmap a completed descriptor and free unused pages */
static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
struct mlx4_en_rx_desc *rx_desc,
struct mbuf **mb_list,
int length)
{
struct mlx4_en_dev *mdev = priv->mdev;
struct mlx4_en_frag_info *frag_info;
dma_addr_t dma;
struct mbuf *mb;
int nr;
mb = mb_list[0];
mb->m_pkthdr.len = length;
/* Collect used fragments while replacing them in the HW descirptors */
for (nr = 0; nr < priv->num_frags; nr++) {
frag_info = &priv->frag_info[nr];
if (length <= frag_info->frag_prefix_size)
break;
if (nr)
mb->m_next = mb_list[nr];
mb = mb_list[nr];
mb->m_len = frag_info[nr].frag_size;
dma = be64_to_cpu(rx_desc->data[nr].addr);
/* Allocate a replacement page */
if (mlx4_en_alloc_buf(priv, rx_desc, mb_list, nr))
goto fail;
/* Unmap buffer */
pci_unmap_single(mdev->pdev, dma, frag_info[nr].frag_size,
PCI_DMA_FROMDEVICE);
}
/* Adjust size of last fragment to match actual length */
mb->m_len = length - priv->frag_info[nr - 1].frag_prefix_size;
mb->m_next = NULL;
return 0;
fail:
/* Drop all accumulated fragments (which have already been replaced in
* the descriptor) of this packet; remaining fragments are reused... */
while (nr > 0) {
nr--;
m_free(mb_list[nr]);
}
return -ENOMEM;
}
static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
struct mlx4_en_rx_ring *ring, int index)
{
struct mlx4_en_rx_desc *rx_desc = ring->buf + (index * ring->stride);
struct mbuf **mb_list = ring->rx_info + (index << priv->log_rx_info);
int i;
for (i = 0; i < priv->num_frags; i++)
if (mlx4_en_alloc_buf(priv, rx_desc, mb_list, i))
goto err;
return 0;
err:
while (i--)
m_free(mb_list[i]);
return -ENOMEM;
}
