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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
View File

@ -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)

15
drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
View File

@ -571,8 +571,9 @@ static bool ixgbe_xmit_zc(struct ixgbe_ring *xdp_ring, unsigned int budget)
union ixgbe_adv_tx_desc *tx_desc = NULL;
struct ixgbe_tx_buffer *tx_bi;
bool work_done = true;
u32 len, cmd_type;
struct xdp_desc desc;
dma_addr_t dma;
u32 cmd_type;
while (budget-- > 0) {
if (unlikely(!ixgbe_desc_unused(xdp_ring)) ||
@ -581,14 +582,16 @@ static bool ixgbe_xmit_zc(struct ixgbe_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_buffer_info[xdp_ring->next_to_use];
tx_bi->bytecount = len;
tx_bi->bytecount = desc.len;
tx_bi->xdpf = NULL;
tx_bi->gso_segs = 1;
@ -599,10 +602,10 @@ static bool ixgbe_xmit_zc(struct ixgbe_ring *xdp_ring, unsigned int budget)
cmd_type = IXGBE_ADVTXD_DTYP_DATA |
IXGBE_ADVTXD_DCMD_DEXT |
IXGBE_ADVTXD_DCMD_IFCS;
cmd_type |= len | IXGBE_TXD_CMD;
cmd_type |= desc.len | IXGBE_TXD_CMD;
tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type);
tx_desc->read.olinfo_status =
cpu_to_le32(len << IXGBE_ADVTXD_PAYLEN_SHIFT);
cpu_to_le32(desc.len << IXGBE_ADVTXD_PAYLEN_SHIFT);
xdp_ring->next_to_use++;
if (xdp_ring->next_to_use == xdp_ring->count)

6
include/net/xdp_sock.h
View File

@ -81,7 +81,7 @@ bool xsk_umem_has_addrs(struct xdp_umem *umem, u32 cnt);
u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr);
void xsk_umem_discard_addr(struct xdp_umem *umem);
void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries);
bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma, u32 *len);
bool xsk_umem_consume_tx(struct xdp_umem *umem, struct xdp_desc *desc);
void xsk_umem_consume_tx_done(struct xdp_umem *umem);
struct xdp_umem_fq_reuse *xsk_reuseq_prepare(u32 nentries);
struct xdp_umem_fq_reuse *xsk_reuseq_swap(struct xdp_umem *umem,
@ -175,8 +175,8 @@ static inline void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries)
{
}
static inline bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma,
u32 *len)
static inline bool xsk_umem_consume_tx(struct xdp_umem *umem,
struct xdp_desc *desc)
{
return false;
}

10
net/xdp/xsk.c
View File

@ -172,22 +172,18 @@ void xsk_umem_consume_tx_done(struct xdp_umem *umem)
}
EXPORT_SYMBOL(xsk_umem_consume_tx_done);
bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma, u32 *len)
bool xsk_umem_consume_tx(struct xdp_umem *umem, struct xdp_desc *desc)
{
struct xdp_desc desc;
struct xdp_sock *xs;
rcu_read_lock();
list_for_each_entry_rcu(xs, &umem->xsk_list, list) {
if (!xskq_peek_desc(xs->tx, &desc))
if (!xskq_peek_desc(xs->tx, desc))
continue;
if (xskq_produce_addr_lazy(umem->cq, desc.addr))
if (xskq_produce_addr_lazy(umem->cq, desc->addr))
goto out;
*dma = xdp_umem_get_dma(umem, desc.addr);
*len = desc.len;
xskq_discard_desc(xs->tx);
rcu_read_unlock();
return true;