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xsk: Return the whole xdp_desc from xsk_umem_consume_tx

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Some drivers want to access the data transmitted in order to implement
acceleration features of the NICs. It is also useful in AF_XDP TX flow.

Change the xsk_umem_consume_tx API to return the whole xdp_desc, that
contains the data pointer, length and DMA address, instead of only the
latter two. Adapt the implementation of i40e and ixgbe to this change.

Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Acked-by: Saeed Mahameed <saeedm@mellanox.com>
Cc: Björn Töpel <bjorn.topel@intel.com>
Cc: Magnus Karlsson <magnus.karlsson@intel.com>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Maxim Mikityanskiy
2019-06-26 17:35:28 +03:00
committed by Daniel Borkmann
parent 123e8da1d3
commit 4bce4e5cb6
4 changed files with 22 additions and 21 deletions
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12
drivers/net/ethernet/intel/i40e/i40e_xsk.c
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@@ -641,8 +641,8 @@ static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)
struct i40e_tx_desc *tx_desc = NULL;
struct i40e_tx_buffer *tx_bi;
bool work_done = true;
struct xdp_desc desc;
dma_addr_t dma;
u32 len;
while (budget-- > 0) {
if (!unlikely(I40E_DESC_UNUSED(xdp_ring))) {
@@ -651,21 +651,23 @@ static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)
break;
}
if (!xsk_umem_consume_tx(xdp_ring->xsk_umem, &dma, &len))
if (!xsk_umem_consume_tx(xdp_ring->xsk_umem, &desc))
break;
dma_sync_single_for_device(xdp_ring->dev, dma, len,
dma = xdp_umem_get_dma(xdp_ring->xsk_umem, desc.addr);
dma_sync_single_for_device(xdp_ring->dev, dma, desc.len,
DMA_BIDIRECTIONAL);
tx_bi = &xdp_ring->tx_bi[xdp_ring->next_to_use];
tx_bi->bytecount = len;
tx_bi->bytecount = desc.len;
tx_desc = I40E_TX_DESC(xdp_ring, xdp_ring->next_to_use);
tx_desc->buffer_addr = cpu_to_le64(dma);
tx_desc->cmd_type_offset_bsz =
build_ctob(I40E_TX_DESC_CMD_ICRC
| I40E_TX_DESC_CMD_EOP,
0, len, 0);
0, desc.len, 0);
xdp_ring->next_to_use++;
if (xdp_ring->next_to_use == xdp_ring->count)