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-rw-r--r--src/plugins/dev_iavf/rx_node.c529
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..946adb1df1b
--- /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;
+ }
+
+ __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;
+
+ /* avoid eating our own tail */
+ arq->descs[(next + arq->n_enqueued) & mask].qword[1] = 0;
+
+#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;
+}