diff options
Diffstat (limited to 'src/plugins/dev_iavf/rx_node.c')
| -rw-r--r-- | src/plugins/dev_iavf/rx_node.c | 529 |
1 files changed, 529 insertions, 0 deletions
diff --git a/src/plugins/dev_iavf/rx_node.c b/src/plugins/dev_iavf/rx_node.c new file mode 100644 index 00000000000..ee6d7e8def0 --- /dev/null +++ b/src/plugins/dev_iavf/rx_node.c @@ -0,0 +1,529 @@ +/* SPDX-License-Identifier: Apache-2.0 + * Copyright (c) 2023 Cisco Systems, Inc. + */ + +#include <vlib/vlib.h> +#include <vnet/dev/dev.h> +#include <vnet/ethernet/ethernet.h> +#include <dev_iavf/iavf.h> + +#define IAVF_RX_REFILL_TRESHOLD 32 + +static const iavf_rx_desc_qw1_t mask_eop = { .eop = 1 }; +static const iavf_rx_desc_qw1_t mask_flm = { .flm = 1 }; +static const iavf_rx_desc_qw1_t mask_dd = { .dd = 1 }; +static const iavf_rx_desc_qw1_t mask_ipe = { .ipe = 1 }; +static const iavf_rx_desc_qw1_t mask_dd_eop = { .dd = 1, .eop = 1 }; + +static_always_inline int +iavf_rxd_is_not_eop (iavf_rx_desc_t *d) +{ + return (d->qw1.as_u64 & mask_eop.as_u64) == 0; +} + +static_always_inline int +iavf_rxd_is_not_dd (iavf_rx_desc_t *d) +{ + return (d->qw1.as_u64 & mask_dd.as_u64) == 0; +} + +static_always_inline void +iavf_rx_desc_write (iavf_rx_desc_t *d, u64 addr) +{ +#ifdef CLIB_HAVE_VEC256 + *(u64x4 *) d = (u64x4){ addr, 0, 0, 0 }; +#else + d->qword[0] = addr; + d->qword[1] = 0; +#endif +} + +static_always_inline void +iavf_rxq_refill (vlib_main_t *vm, vlib_node_runtime_t *node, + vnet_dev_rx_queue_t *rxq, int use_va_dma) +{ + u16 n_refill, mask, n_alloc, slot, size; + iavf_rxq_t *arq = vnet_dev_get_rx_queue_data (rxq); + vlib_buffer_t *b[8]; + iavf_rx_desc_t *d, *first_d; + void *p[8]; + + size = rxq->size; + mask = size - 1; + n_refill = mask - arq->n_enqueued; + if (PREDICT_TRUE (n_refill <= IAVF_RX_REFILL_TRESHOLD)) + return; + + slot = (arq->next - n_refill - 1) & mask; + + n_refill &= ~7; /* round to 8 */ + n_alloc = vlib_buffer_alloc_to_ring_from_pool ( + vm, arq->buffer_indices, slot, size, n_refill, + vnet_dev_get_rx_queue_buffer_pool_index (rxq)); + + if (PREDICT_FALSE (n_alloc != n_refill)) + { + vlib_error_count (vm, node->node_index, IAVF_RX_NODE_CTR_BUFFER_ALLOC, + 1); + if (n_alloc) + vlib_buffer_free_from_ring (vm, arq->buffer_indices, slot, size, + n_alloc); + return; + } + + arq->n_enqueued += n_alloc; + first_d = arq->descs; + + ASSERT (slot % 8 == 0); + + while (n_alloc >= 8) + { + d = first_d + slot; + + if (use_va_dma) + { + vlib_get_buffers_with_offset (vm, arq->buffer_indices + slot, p, 8, + sizeof (vlib_buffer_t)); + iavf_rx_desc_write (d + 0, pointer_to_uword (p[0])); + iavf_rx_desc_write (d + 1, pointer_to_uword (p[1])); + iavf_rx_desc_write (d + 2, pointer_to_uword (p[2])); + iavf_rx_desc_write (d + 3, pointer_to_uword (p[3])); + iavf_rx_desc_write (d + 4, pointer_to_uword (p[4])); + iavf_rx_desc_write (d + 5, pointer_to_uword (p[5])); + iavf_rx_desc_write (d + 6, pointer_to_uword (p[6])); + iavf_rx_desc_write (d + 7, pointer_to_uword (p[7])); + } + else + { + vlib_get_buffers (vm, arq->buffer_indices + slot, b, 8); + iavf_rx_desc_write (d + 0, vlib_buffer_get_pa (vm, b[0])); + iavf_rx_desc_write (d + 1, vlib_buffer_get_pa (vm, b[1])); + iavf_rx_desc_write (d + 2, vlib_buffer_get_pa (vm, b[2])); + iavf_rx_desc_write (d + 3, vlib_buffer_get_pa (vm, b[3])); + iavf_rx_desc_write (d + 4, vlib_buffer_get_pa (vm, b[4])); + iavf_rx_desc_write (d + 5, vlib_buffer_get_pa (vm, b[5])); + iavf_rx_desc_write (d + 6, vlib_buffer_get_pa (vm, b[6])); + iavf_rx_desc_write (d + 7, vlib_buffer_get_pa (vm, b[7])); + } + + /* next */ + slot = (slot + 8) & mask; + n_alloc -= 8; + } + + /* RXQ can be smaller than 256 packets, especially if jumbo. */ + arq->descs[slot].qword[1] = 0; + + __atomic_store_n (arq->qrx_tail, slot, __ATOMIC_RELEASE); +} + +static_always_inline uword +iavf_rx_attach_tail (vlib_main_t *vm, vlib_buffer_template_t *bt, + vlib_buffer_t *b, u64 qw1, iavf_rx_tail_t *t) +{ + vlib_buffer_t *hb = b; + u32 tlnifb = 0, i = 0; + + if (qw1 & mask_eop.as_u64) + return 0; + + while ((qw1 & mask_eop.as_u64) == 0) + { + ASSERT (i < IAVF_RX_MAX_DESC_IN_CHAIN - 1); + ASSERT (qw1 & mask_dd.as_u64); + qw1 = t->qw1s[i]; + b->next_buffer = t->buffers[i]; + b->flags |= VLIB_BUFFER_NEXT_PRESENT; + b = vlib_get_buffer (vm, b->next_buffer); + b->template = *bt; + tlnifb += b->current_length = ((iavf_rx_desc_qw1_t) qw1).length; + i++; + } + + hb->total_length_not_including_first_buffer = tlnifb; + hb->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; + return tlnifb; +} + +static_always_inline void +iavf_process_flow_offload (vnet_dev_port_t *port, iavf_rt_data_t *rtd, + uword n_rx_packets) +{ + uword n; + iavf_flow_lookup_entry_t fle; + iavf_port_t *ap = vnet_dev_get_port_data (port); + + for (n = 0; n < n_rx_packets; n++) + { + if ((rtd->qw1s[n] & mask_flm.as_u64) == 0) + continue; + + fle = *pool_elt_at_index (ap->flow_lookup_entries, rtd->flow_ids[n]); + + if (fle.next_index != (u16) ~0) + rtd->next[n] = fle.next_index; + + if (fle.flow_id != ~0) + rtd->bufs[n]->flow_id = fle.flow_id; + + if (fle.buffer_advance != ~0) + vlib_buffer_advance (rtd->bufs[n], fle.buffer_advance); + } +} + +static_always_inline uword +iavf_process_rx_burst (vlib_main_t *vm, vlib_node_runtime_t *node, + vnet_dev_rx_queue_t *rxq, iavf_rt_data_t *rtd, + vlib_buffer_template_t *bt, u32 n_left, + int maybe_multiseg) +{ + vlib_buffer_t **b = rtd->bufs; + u64 *qw1 = rtd->qw1s; + iavf_rx_tail_t *tail = rtd->tails; + uword n_rx_bytes = 0; + + while (n_left >= 4) + { + if (n_left >= 12) + { + vlib_prefetch_buffer_header (b[8], LOAD); + vlib_prefetch_buffer_header (b[9], LOAD); + vlib_prefetch_buffer_header (b[10], LOAD); + vlib_prefetch_buffer_header (b[11], LOAD); + } + + b[0]->template = *bt; + b[1]->template = *bt; + b[2]->template = *bt; + b[3]->template = *bt; + + n_rx_bytes += b[0]->current_length = + ((iavf_rx_desc_qw1_t) qw1[0]).length; + n_rx_bytes += b[1]->current_length = + ((iavf_rx_desc_qw1_t) qw1[1]).length; + n_rx_bytes += b[2]->current_length = + ((iavf_rx_desc_qw1_t) qw1[2]).length; + n_rx_bytes += b[3]->current_length = + ((iavf_rx_desc_qw1_t) qw1[3]).length; + + if (maybe_multiseg) + { + n_rx_bytes += iavf_rx_attach_tail (vm, bt, b[0], qw1[0], tail + 0); + n_rx_bytes += iavf_rx_attach_tail (vm, bt, b[1], qw1[1], tail + 1); + n_rx_bytes += iavf_rx_attach_tail (vm, bt, b[2], qw1[2], tail + 2); + n_rx_bytes += iavf_rx_attach_tail (vm, bt, b[3], qw1[3], tail + 3); + } + + /* next */ + qw1 += 4; + tail += 4; + b += 4; + n_left -= 4; + } + + while (n_left) + { + b[0]->template = *bt; + + n_rx_bytes += b[0]->current_length = + ((iavf_rx_desc_qw1_t) qw1[0]).length; + + if (maybe_multiseg) + n_rx_bytes += iavf_rx_attach_tail (vm, bt, b[0], qw1[0], tail + 0); + + /* next */ + qw1 += 1; + tail += 1; + b += 1; + n_left -= 1; + } + return n_rx_bytes; +} + +static_always_inline uword +iavf_device_input_inline (vlib_main_t *vm, vlib_node_runtime_t *node, + vlib_frame_t *frame, vnet_dev_port_t *port, + vnet_dev_rx_queue_t *rxq, int with_flows) +{ + vnet_main_t *vnm = vnet_get_main (); + u32 thr_idx = vlib_get_thread_index (); + iavf_rt_data_t *rtd = vnet_dev_get_rt_temp_space (vm); + iavf_rxq_t *arq = vnet_dev_get_rx_queue_data (rxq); + vlib_buffer_template_t bt = rxq->buffer_template; + u32 n_trace, n_rx_packets = 0, n_rx_bytes = 0; + u16 n_tail_desc = 0; + u64 or_qw1 = 0; + u32 *bi, *to_next, n_left_to_next; + u32 next_index = rxq->next_index; + u32 sw_if_index = port->intf.sw_if_index; + u32 hw_if_index = port->intf.hw_if_index; + u16 next = arq->next; + u16 size = rxq->size; + u16 mask = size - 1; + iavf_rx_desc_t *d, *descs = arq->descs; +#ifdef CLIB_HAVE_VEC256 + u64x4 q1x4, or_q1x4 = { 0 }; + u32x4 fdidx4; + u64x4 dd_eop_mask4 = u64x4_splat (mask_dd_eop.as_u64); +#elif defined(CLIB_HAVE_VEC128) + u32x4 q1x4_lo, q1x4_hi, or_q1x4 = { 0 }; + u32x4 fdidx4; + u32x4 dd_eop_mask4 = u32x4_splat (mask_dd_eop.as_u64); +#endif + int single_next = 1; + + /* is there anything on the ring */ + d = descs + next; + if ((d->qword[1] & mask_dd.as_u64) == 0) + goto done; + + vlib_get_new_next_frame (vm, node, next_index, to_next, n_left_to_next); + + /* fetch up to IAVF_RX_VECTOR_SZ from the rx ring, unflatten them and + copy needed data from descriptor to rx vector */ + bi = to_next; + + while (n_rx_packets < IAVF_RX_VECTOR_SZ) + { + if (next + 11 < size) + { + int stride = 8; + clib_prefetch_load ((void *) (descs + (next + stride))); + clib_prefetch_load ((void *) (descs + (next + stride + 1))); + clib_prefetch_load ((void *) (descs + (next + stride + 2))); + clib_prefetch_load ((void *) (descs + (next + stride + 3))); + } + +#ifdef CLIB_HAVE_VEC256 + if (n_rx_packets >= IAVF_RX_VECTOR_SZ - 4 || next >= size - 4) + goto one_by_one; + + q1x4 = u64x4_gather ((void *) &d[0].qword[1], (void *) &d[1].qword[1], + (void *) &d[2].qword[1], (void *) &d[3].qword[1]); + + /* not all packets are ready or at least one of them is chained */ + if (!u64x4_is_equal (q1x4 & dd_eop_mask4, dd_eop_mask4)) + goto one_by_one; + + or_q1x4 |= q1x4; + + u64x4_store_unaligned (q1x4, rtd->qw1s + n_rx_packets); +#elif defined(CLIB_HAVE_VEC128) + if (n_rx_packets >= IAVF_RX_VECTOR_SZ - 4 || next >= size - 4) + goto one_by_one; + + q1x4_lo = + u32x4_gather ((void *) &d[0].qword[1], (void *) &d[1].qword[1], + (void *) &d[2].qword[1], (void *) &d[3].qword[1]); + + /* not all packets are ready or at least one of them is chained */ + if (!u32x4_is_equal (q1x4_lo & dd_eop_mask4, dd_eop_mask4)) + goto one_by_one; + + q1x4_hi = u32x4_gather ( + (void *) &d[0].qword[1] + 4, (void *) &d[1].qword[1] + 4, + (void *) &d[2].qword[1] + 4, (void *) &d[3].qword[1] + 4); + + or_q1x4 |= q1x4_lo; + rtd->qw1s[n_rx_packets + 0] = (u64) q1x4_hi[0] << 32 | (u64) q1x4_lo[0]; + rtd->qw1s[n_rx_packets + 1] = (u64) q1x4_hi[1] << 32 | (u64) q1x4_lo[1]; + rtd->qw1s[n_rx_packets + 2] = (u64) q1x4_hi[2] << 32 | (u64) q1x4_lo[2]; + rtd->qw1s[n_rx_packets + 3] = (u64) q1x4_hi[3] << 32 | (u64) q1x4_lo[3]; +#endif +#if defined(CLIB_HAVE_VEC256) || defined(CLIB_HAVE_VEC128) + + if (with_flows) + { + fdidx4 = u32x4_gather ( + (void *) &d[0].fdid_flex_hi, (void *) &d[1].fdid_flex_hi, + (void *) &d[2].fdid_flex_hi, (void *) &d[3].fdid_flex_hi); + u32x4_store_unaligned (fdidx4, rtd->flow_ids + n_rx_packets); + } + + vlib_buffer_copy_indices (bi, arq->buffer_indices + next, 4); + + /* next */ + next = (next + 4) & mask; + d = descs + next; + n_rx_packets += 4; + bi += 4; + continue; + one_by_one: +#endif + clib_prefetch_load ((void *) (descs + ((next + 8) & mask))); + + if (iavf_rxd_is_not_dd (d)) + break; + + bi[0] = arq->buffer_indices[next]; + + /* deal with chained buffers */ + if (PREDICT_FALSE (iavf_rxd_is_not_eop (d))) + { + u16 tail_desc = 0; + u16 tail_next = next; + iavf_rx_tail_t *tail = rtd->tails + n_rx_packets; + iavf_rx_desc_t *td; + do + { + tail_next = (tail_next + 1) & mask; + td = descs + tail_next; + + /* bail out in case of incomplete transaction */ + if (iavf_rxd_is_not_dd (td)) + goto no_more_desc; + + or_qw1 |= tail->qw1s[tail_desc] = td[0].qword[1]; + tail->buffers[tail_desc] = arq->buffer_indices[tail_next]; + tail_desc++; + } + while (iavf_rxd_is_not_eop (td)); + next = tail_next; + n_tail_desc += tail_desc; + } + + or_qw1 |= rtd->qw1s[n_rx_packets] = d[0].qword[1]; + if (PREDICT_FALSE (with_flows)) + { + rtd->flow_ids[n_rx_packets] = d[0].fdid_flex_hi; + } + + /* next */ + next = (next + 1) & mask; + d = descs + next; + n_rx_packets++; + bi++; + } +no_more_desc: + + if (n_rx_packets == 0) + goto done; + + arq->next = next; + arq->n_enqueued -= n_rx_packets + n_tail_desc; + +#if defined(CLIB_HAVE_VEC256) || defined(CLIB_HAVE_VEC128) + or_qw1 |= or_q1x4[0] | or_q1x4[1] | or_q1x4[2] | or_q1x4[3]; +#endif + + vlib_get_buffers (vm, to_next, rtd->bufs, n_rx_packets); + + n_rx_bytes = + n_tail_desc ? + iavf_process_rx_burst (vm, node, rxq, rtd, &bt, n_rx_packets, 1) : + iavf_process_rx_burst (vm, node, rxq, rtd, &bt, n_rx_packets, 0); + + /* the MARKed packets may have different next nodes */ + if (PREDICT_FALSE (with_flows && (or_qw1 & mask_flm.as_u64))) + { + u32 n; + single_next = 0; + for (n = 0; n < n_rx_packets; n++) + rtd->next[n] = next_index; + + iavf_process_flow_offload (port, rtd, n_rx_packets); + } + + /* packet trace if enabled */ + if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node)))) + { + u32 n_left = n_rx_packets; + u32 i, j; + u16 *next_indices = rtd->next; + + i = 0; + while (n_trace && n_left) + { + vlib_buffer_t *b = rtd->bufs[i]; + if (PREDICT_FALSE (single_next == 0)) + next_index = next_indices[0]; + + if (PREDICT_TRUE (vlib_trace_buffer (vm, node, next_index, b, + /* follow_chain */ 0))) + { + iavf_rx_trace_t *tr = vlib_add_trace (vm, node, b, sizeof (*tr)); + tr->next_index = next_index; + tr->qid = rxq->queue_id; + tr->hw_if_index = hw_if_index; + tr->qw1s[0] = rtd->qw1s[i]; + tr->flow_id = + (tr->qw1s[0] & mask_flm.as_u64) ? rtd->flow_ids[i] : 0; + for (j = 1; j < IAVF_RX_MAX_DESC_IN_CHAIN; j++) + tr->qw1s[j] = rtd->tails[i].qw1s[j - 1]; + + n_trace--; + } + + /* next */ + n_left--; + i++; + next_indices++; + } + vlib_set_trace_count (vm, node, n_trace); + } + + /* enqueu the packets to the next nodes */ + if (PREDICT_FALSE (with_flows && (or_qw1 & mask_flm.as_u64))) + { + /* release next node's frame vector, in this case we use + vlib_buffer_enqueue_to_next to place the packets + */ + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + + /* enqueue buffers to the next node */ + vlib_buffer_enqueue_to_next (vm, node, to_next, rtd->next, n_rx_packets); + } + else + { + if (PREDICT_TRUE (next_index == VNET_DEV_ETH_RX_PORT_NEXT_ETH_INPUT)) + { + vlib_next_frame_t *nf; + vlib_frame_t *f; + ethernet_input_frame_t *ef; + nf = vlib_node_runtime_get_next_frame (vm, node, next_index); + f = vlib_get_frame (vm, nf->frame); + f->flags = ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX; + + ef = vlib_frame_scalar_args (f); + ef->sw_if_index = sw_if_index; + ef->hw_if_index = hw_if_index; + + if ((or_qw1 & mask_ipe.as_u64) == 0) + f->flags |= ETH_INPUT_FRAME_F_IP4_CKSUM_OK; + vlib_frame_no_append (f); + } + + n_left_to_next -= n_rx_packets; + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + vlib_increment_combined_counter ( + vnm->interface_main.combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, + thr_idx, hw_if_index, n_rx_packets, n_rx_bytes); + +done: + return n_rx_packets; +} + +VNET_DEV_NODE_FN (iavf_rx_node) +(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) +{ + u32 n_rx = 0; + foreach_vnet_dev_rx_queue_runtime (rxq, node) + { + vnet_dev_port_t *port = rxq->port; + iavf_port_t *ap = vnet_dev_get_port_data (port); + if (PREDICT_FALSE (ap->flow_offload)) + n_rx += iavf_device_input_inline (vm, node, frame, port, rxq, 1); + else + n_rx += iavf_device_input_inline (vm, node, frame, port, rxq, 0); + + /* refill rx ring */ + if (rxq->port->dev->va_dma) + iavf_rxq_refill (vm, node, rxq, 1 /* use_va_dma */); + else + iavf_rxq_refill (vm, node, rxq, 0 /* use_va_dma */); + } + + return n_rx; +} |