diff options
Diffstat (limited to 'drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c')
| -rw-r--r-- | drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c index e876ff120758..65c3e2c979d4 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c @@ -624,3 +624,178 @@ void ixgbe_xsk_clean_rx_ring(struct ixgbe_ring *rx_ring) } } } + +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; + dma_addr_t dma; + + while (budget-- > 0) { + if (unlikely(!ixgbe_desc_unused(xdp_ring))) { + work_done = false; + break; + } + + if (!xsk_umem_consume_tx(xdp_ring->xsk_umem, &dma, &len)) + break; + + dma_sync_single_for_device(xdp_ring->dev, dma, len, + DMA_BIDIRECTIONAL); + + tx_bi = &xdp_ring->tx_buffer_info[xdp_ring->next_to_use]; + tx_bi->bytecount = len; + tx_bi->xdpf = NULL; + + tx_desc = IXGBE_TX_DESC(xdp_ring, xdp_ring->next_to_use); + tx_desc->read.buffer_addr = cpu_to_le64(dma); + + /* put descriptor type bits */ + cmd_type = IXGBE_ADVTXD_DTYP_DATA | + IXGBE_ADVTXD_DCMD_DEXT | + IXGBE_ADVTXD_DCMD_IFCS; + cmd_type |= 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); + + xdp_ring->next_to_use++; + if (xdp_ring->next_to_use == xdp_ring->count) + xdp_ring->next_to_use = 0; + } + + if (tx_desc) { + ixgbe_xdp_ring_update_tail(xdp_ring); + xsk_umem_consume_tx_done(xdp_ring->xsk_umem); + } + + return !!budget && work_done; +} + +static void ixgbe_clean_xdp_tx_buffer(struct ixgbe_ring *tx_ring, + struct ixgbe_tx_buffer *tx_bi) +{ + xdp_return_frame(tx_bi->xdpf); + dma_unmap_single(tx_ring->dev, + dma_unmap_addr(tx_bi, dma), + dma_unmap_len(tx_bi, len), DMA_TO_DEVICE); + dma_unmap_len_set(tx_bi, len, 0); +} + +bool ixgbe_clean_xdp_tx_irq(struct ixgbe_q_vector *q_vector, + struct ixgbe_ring *tx_ring, int napi_budget) +{ + unsigned int total_packets = 0, total_bytes = 0; + u32 i = tx_ring->next_to_clean, xsk_frames = 0; + unsigned int budget = q_vector->tx.work_limit; + struct xdp_umem *umem = tx_ring->xsk_umem; + union ixgbe_adv_tx_desc *tx_desc; + struct ixgbe_tx_buffer *tx_bi; + bool xmit_done; + + tx_bi = &tx_ring->tx_buffer_info[i]; + tx_desc = IXGBE_TX_DESC(tx_ring, i); + i -= tx_ring->count; + + do { + if (!(tx_desc->wb.status & cpu_to_le32(IXGBE_TXD_STAT_DD))) + break; + + total_bytes += tx_bi->bytecount; + total_packets += tx_bi->gso_segs; + + if (tx_bi->xdpf) + ixgbe_clean_xdp_tx_buffer(tx_ring, tx_bi); + else + xsk_frames++; + + tx_bi->xdpf = NULL; + total_bytes += tx_bi->bytecount; + + tx_bi++; + tx_desc++; + i++; + if (unlikely(!i)) { + i -= tx_ring->count; + tx_bi = tx_ring->tx_buffer_info; + tx_desc = IXGBE_TX_DESC(tx_ring, 0); + } + + /* issue prefetch for next Tx descriptor */ + prefetch(tx_desc); + + /* update budget accounting */ + budget--; + } while (likely(budget)); + + i += tx_ring->count; + tx_ring->next_to_clean = i; + + u64_stats_update_begin(&tx_ring->syncp); + tx_ring->stats.bytes += total_bytes; + tx_ring->stats.packets += total_packets; + u64_stats_update_end(&tx_ring->syncp); + q_vector->tx.total_bytes += total_bytes; + q_vector->tx.total_packets += total_packets; + + if (xsk_frames) + xsk_umem_complete_tx(umem, xsk_frames); + + xmit_done = ixgbe_xmit_zc(tx_ring, q_vector->tx.work_limit); + return budget > 0 && xmit_done; +} + +int ixgbe_xsk_async_xmit(struct net_device *dev, u32 qid) +{ + struct ixgbe_adapter *adapter = netdev_priv(dev); + struct ixgbe_ring *ring; + + if (test_bit(__IXGBE_DOWN, &adapter->state)) + return -ENETDOWN; + + if (!READ_ONCE(adapter->xdp_prog)) + return -ENXIO; + + if (qid >= adapter->num_xdp_queues) + return -ENXIO; + + if (!adapter->xsk_umems || !adapter->xsk_umems[qid]) + return -ENXIO; + + ring = adapter->xdp_ring[qid]; + if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi)) { + u64 eics = BIT_ULL(ring->q_vector->v_idx); + + ixgbe_irq_rearm_queues(adapter, eics); + } + + return 0; +} + +void ixgbe_xsk_clean_tx_ring(struct ixgbe_ring *tx_ring) +{ + u16 ntc = tx_ring->next_to_clean, ntu = tx_ring->next_to_use; + struct xdp_umem *umem = tx_ring->xsk_umem; + struct ixgbe_tx_buffer *tx_bi; + u32 xsk_frames = 0; + + while (ntc != ntu) { + tx_bi = &tx_ring->tx_buffer_info[ntc]; + + if (tx_bi->xdpf) + ixgbe_clean_xdp_tx_buffer(tx_ring, tx_bi); + else + xsk_frames++; + + tx_bi->xdpf = NULL; + + ntc++; + if (ntc == tx_ring->count) + ntc = 0; + } + + if (xsk_frames) + xsk_umem_complete_tx(umem, xsk_frames); +} |