diff options
Diffstat (limited to 'src/plugins/memif/node.c')
| -rw-r--r-- | src/plugins/memif/node.c | 533 |
1 files changed, 533 insertions, 0 deletions
diff --git a/src/plugins/memif/node.c b/src/plugins/memif/node.c new file mode 100644 index 00000000..4acc7149 --- /dev/null +++ b/src/plugins/memif/node.c @@ -0,0 +1,533 @@ +/* + *------------------------------------------------------------------ + * Copyright (c) 2016 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + *------------------------------------------------------------------ + */ + +#define _GNU_SOURCE +#include <stdint.h> +#include <net/if.h> +#include <sys/ioctl.h> +#include <sys/uio.h> + +#include <vlib/vlib.h> +#include <vlib/unix/unix.h> +#include <vnet/ethernet/ethernet.h> +#include <vnet/devices/devices.h> +#include <vnet/feature/feature.h> + +#include <memif/memif.h> +#include <memif/private.h> + +#define foreach_memif_input_error \ + _(NOT_IP, "not ip packet") + +typedef enum +{ +#define _(f,s) MEMIF_INPUT_ERROR_##f, + foreach_memif_input_error +#undef _ + MEMIF_INPUT_N_ERROR, +} memif_input_error_t; + +static char *memif_input_error_strings[] = { +#define _(n,s) s, + foreach_memif_input_error +#undef _ +}; + +typedef struct +{ + u32 next_index; + u32 hw_if_index; + u16 ring; +} memif_input_trace_t; + +static u8 * +format_memif_input_trace (u8 * s, va_list * args) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + memif_input_trace_t *t = va_arg (*args, memif_input_trace_t *); + uword indent = format_get_indent (s); + + s = format (s, "memif: hw_if_index %d next-index %d", + t->hw_if_index, t->next_index); + s = format (s, "\n%Uslot: ring %u", format_white_space, indent + 2, + t->ring); + return s; +} + +static_always_inline void +memif_prefetch (vlib_main_t * vm, u32 bi) +{ + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + vlib_prefetch_buffer_header (b, STORE); + CLIB_PREFETCH (b->data, CLIB_CACHE_LINE_BYTES, STORE); +} + +static_always_inline void +memif_buffer_add_to_chain (vlib_main_t * vm, u32 bi, u32 first_bi, + u32 prev_bi) +{ + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + vlib_buffer_t *first_b = vlib_get_buffer (vm, first_bi); + vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_bi); + + /* update first buffer */ + first_b->total_length_not_including_first_buffer += b->current_length; + + /* update previous buffer */ + prev_b->next_buffer = bi; + prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT; + + /* update current buffer */ + b->next_buffer = 0; +} + +/** + * @brief Copy buffer from rx ring + * + * @param * vm (in) + * @param * mif (in) pointer to memif interface + * @param * ring (in) pointer to memif ring + * @param * rd (in) pointer to ring data + * @param ring_size (in) ring size + * @param * n_free_bufs (in/out) the number of free vlib buffers available + * @param ** first_b (out) the first vlib buffer pointer + * @param * first_bi (out) the first vlib buffer index + * @param * bi (in/out) the current buffer index + * #param * num_slots (in/out) the number of descriptors available to read + * + * @return total bytes read from rx ring also written to vlib buffers + */ +static_always_inline uword +memif_copy_buffer_from_rx_ring (vlib_main_t * vm, memif_if_t * mif, + memif_ring_t * ring, memif_queue_t * mq, + u16 ring_size, u32 n_buffer_bytes, + u32 * n_free_bufs, vlib_buffer_t ** first_b, + u32 * first_bi, u32 * bi, u16 * num_slots) +{ + memif_main_t *nm = &memif_main; + u32 thread_index = vlib_get_thread_index (); + u32 total_bytes = 0, offset = 0; + u32 data_len; + u32 bytes_to_copy; + void *mb; + vlib_buffer_t *b; + u16 mask = ring_size - 1; + u32 prev_bi; + u16 last_head; + + while (*num_slots) + { + data_len = ring->desc[mq->last_head].length; + while (data_len && (*n_free_bufs)) + { + /* get empty buffer */ + u32 last_buf = vec_len (nm->rx_buffers[thread_index]) - 1; + prev_bi = *bi; + *bi = nm->rx_buffers[thread_index][last_buf]; + b = vlib_get_buffer (vm, *bi); + _vec_len (nm->rx_buffers[thread_index]) = last_buf; + (*n_free_bufs)--; + if (PREDICT_FALSE (*n_free_bufs == 0)) + { + *n_free_bufs += + vlib_buffer_alloc (vm, + &nm->rx_buffers[thread_index] + [*n_free_bufs], ring_size); + _vec_len (nm->rx_buffers[thread_index]) = *n_free_bufs; + } + + if (last_buf > 4) + { + memif_prefetch (vm, nm->rx_buffers[thread_index][last_buf - 2]); + memif_prefetch (vm, nm->rx_buffers[thread_index][last_buf - 3]); + } + + /* copy buffer */ + bytes_to_copy = + data_len > n_buffer_bytes ? n_buffer_bytes : data_len; + b->current_data = 0; + mb = memif_get_buffer (mif, ring, mq->last_head); + clib_memcpy (vlib_buffer_get_current (b), mb + offset, + CLIB_CACHE_LINE_BYTES); + if (bytes_to_copy > CLIB_CACHE_LINE_BYTES) + clib_memcpy (vlib_buffer_get_current (b) + CLIB_CACHE_LINE_BYTES, + mb + CLIB_CACHE_LINE_BYTES + offset, + bytes_to_copy - CLIB_CACHE_LINE_BYTES); + + /* fill buffer header */ + b->current_length = bytes_to_copy; + + if (total_bytes == 0) + { + /* fill buffer metadata */ + b->total_length_not_including_first_buffer = 0; + b->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID; + vnet_buffer (b)->sw_if_index[VLIB_RX] = mif->sw_if_index; + vnet_buffer (b)->sw_if_index[VLIB_TX] = (u32) ~ 0; + *first_bi = *bi; + *first_b = vlib_get_buffer (vm, *first_bi); + } + else + memif_buffer_add_to_chain (vm, *bi, *first_bi, prev_bi); + + offset += bytes_to_copy; + total_bytes += bytes_to_copy; + data_len -= bytes_to_copy; + } + last_head = mq->last_head; + /* Advance to next descriptor */ + mq->last_head = (mq->last_head + 1) & mask; + offset = 0; + (*num_slots)--; + if ((ring->desc[last_head].flags & MEMIF_DESC_FLAG_NEXT) == 0) + break; + } + + return (total_bytes); +} + + +static_always_inline u32 +memif_next_from_ip_hdr (vlib_node_runtime_t * node, vlib_buffer_t * b) +{ + u8 *ptr = vlib_buffer_get_current (b); + u8 v = *ptr & 0xf0; + + if (PREDICT_TRUE (v == 0x40)) + return VNET_DEVICE_INPUT_NEXT_IP4_NCS_INPUT; + else if (PREDICT_TRUE (v == 0x60)) + return VNET_DEVICE_INPUT_NEXT_IP6_INPUT; + + b->error = node->errors[MEMIF_INPUT_ERROR_NOT_IP]; + return VNET_DEVICE_INPUT_NEXT_DROP; +} + +static_always_inline uword +memif_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame, memif_if_t * mif, + memif_ring_type_t type, u16 qid, + memif_interface_mode_t mode) +{ + vnet_main_t *vnm = vnet_get_main (); + memif_ring_t *ring; + memif_queue_t *mq; + u16 head; + u32 next_index; + uword n_trace = vlib_get_trace_count (vm, node); + memif_main_t *nm = &memif_main; + u32 n_rx_packets = 0; + u32 n_rx_bytes = 0; + u32 *to_next = 0; + u32 n_free_bufs; + u32 b0_total, b1_total; + u32 thread_index = vlib_get_thread_index (); + u16 ring_size, mask, num_slots; + u32 n_buffer_bytes = vlib_buffer_free_list_buffer_size (vm, + VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX); + + mq = vec_elt_at_index (mif->rx_queues, qid); + ring = mq->ring; + ring_size = 1 << mq->log2_ring_size; + mask = ring_size - 1; + + if (mode == MEMIF_INTERFACE_MODE_IP) + { + next_index = VNET_DEVICE_INPUT_NEXT_IP6_INPUT; + } + else + { + next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; + } + + n_free_bufs = vec_len (nm->rx_buffers[thread_index]); + if (PREDICT_FALSE (n_free_bufs < ring_size)) + { + vec_validate (nm->rx_buffers[thread_index], + ring_size + n_free_bufs - 1); + n_free_bufs += + vlib_buffer_alloc (vm, &nm->rx_buffers[thread_index][n_free_bufs], + ring_size); + _vec_len (nm->rx_buffers[thread_index]) = n_free_bufs; + } + + head = ring->head; + if (head == mq->last_head) + return 0; + + if (head > mq->last_head) + num_slots = head - mq->last_head; + else + num_slots = ring_size - mq->last_head + head; + + while (num_slots) + { + u32 n_left_to_next; + u32 next0 = next_index; + u32 next1 = next_index; + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (num_slots > 11 && n_left_to_next > 2) + { + if (PREDICT_TRUE (mq->last_head + 5 < ring_size)) + { + CLIB_PREFETCH (memif_get_buffer (mif, ring, mq->last_head + 2), + CLIB_CACHE_LINE_BYTES, LOAD); + CLIB_PREFETCH (memif_get_buffer (mif, ring, mq->last_head + 3), + CLIB_CACHE_LINE_BYTES, LOAD); + CLIB_PREFETCH (&ring->desc[mq->last_head + 4], + CLIB_CACHE_LINE_BYTES, LOAD); + CLIB_PREFETCH (&ring->desc[mq->last_head + 5], + CLIB_CACHE_LINE_BYTES, LOAD); + } + else + { + CLIB_PREFETCH (memif_get_buffer + (mif, ring, (mq->last_head + 2) % mask), + CLIB_CACHE_LINE_BYTES, LOAD); + CLIB_PREFETCH (memif_get_buffer + (mif, ring, (mq->last_head + 3) % mask), + CLIB_CACHE_LINE_BYTES, LOAD); + CLIB_PREFETCH (&ring->desc[(mq->last_head + 4) % mask], + CLIB_CACHE_LINE_BYTES, LOAD); + CLIB_PREFETCH (&ring->desc[(mq->last_head + 5) % mask], + CLIB_CACHE_LINE_BYTES, LOAD); + } + + vlib_buffer_t *first_b0 = 0; + u32 bi0 = 0, first_bi0 = 0; + b0_total = memif_copy_buffer_from_rx_ring (vm, mif, ring, mq, + ring_size, + n_buffer_bytes, + &n_free_bufs, &first_b0, + &first_bi0, &bi0, + &num_slots); + + vlib_buffer_t *first_b1 = 0; + u32 bi1 = 0, first_bi1 = 0; + b1_total = memif_copy_buffer_from_rx_ring (vm, mif, ring, mq, + ring_size, + n_buffer_bytes, + &n_free_bufs, &first_b1, + &first_bi1, &bi1, + &num_slots); + + /* enqueue buffer */ + to_next[0] = first_bi0; + to_next[1] = first_bi1; + to_next += 2; + n_left_to_next -= 2; + + + if (mode == MEMIF_INTERFACE_MODE_IP) + { + next0 = memif_next_from_ip_hdr (node, first_b0); + next1 = memif_next_from_ip_hdr (node, first_b1); + } + else if (mode == MEMIF_INTERFACE_MODE_ETHERNET) + { + if (PREDICT_FALSE (mif->per_interface_next_index != ~0)) + next0 = next1 = mif->per_interface_next_index; + else + /* redirect if feature path + * enabled */ + vnet_feature_start_device_input_x2 (mif->sw_if_index, + &next0, &next1, + first_b0, first_b1); + } + + /* trace */ + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (first_b0); + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (first_b1); + + if (PREDICT_FALSE (n_trace > 0)) + { + /* b0 */ + if (PREDICT_TRUE (first_b0 != 0)) + { + memif_input_trace_t *tr; + vlib_trace_buffer (vm, node, next0, first_b0, + /* follow_chain */ 0); + vlib_set_trace_count (vm, node, --n_trace); + tr = vlib_add_trace (vm, node, first_b0, sizeof (*tr)); + tr->next_index = next0; + tr->hw_if_index = mif->hw_if_index; + tr->ring = qid; + } + if (n_trace) + { + /* b1 */ + if (PREDICT_TRUE (first_b1 != 0)) + { + memif_input_trace_t *tr; + vlib_trace_buffer (vm, node, next1, first_b1, + /* follow_chain */ 0); + vlib_set_trace_count (vm, node, --n_trace); + tr = vlib_add_trace (vm, node, first_b1, sizeof (*tr)); + tr->next_index = next1; + tr->hw_if_index = mif->hw_if_index; + tr->ring = qid; + } + } + } + + /* enqueue */ + vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, + n_left_to_next, first_bi0, + first_bi1, next0, next1); + + /* next packet */ + n_rx_packets += 2; + n_rx_bytes += b0_total + b1_total; + } + while (num_slots && n_left_to_next) + { + vlib_buffer_t *first_b0 = 0; + u32 bi0 = 0, first_bi0 = 0; + b0_total = memif_copy_buffer_from_rx_ring (vm, mif, ring, mq, + ring_size, + n_buffer_bytes, + &n_free_bufs, &first_b0, + &first_bi0, &bi0, + &num_slots); + + if (mode == MEMIF_INTERFACE_MODE_IP) + { + next0 = memif_next_from_ip_hdr (node, first_b0); + } + else if (mode == MEMIF_INTERFACE_MODE_ETHERNET) + { + if (PREDICT_FALSE (mif->per_interface_next_index != ~0)) + next0 = mif->per_interface_next_index; + else + /* redirect if feature path + * enabled */ + vnet_feature_start_device_input_x1 (mif->sw_if_index, + &next0, first_b0); + } + + /* trace */ + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (first_b0); + + if (PREDICT_FALSE (n_trace > 0)) + { + if (PREDICT_TRUE (first_b0 != 0)) + { + memif_input_trace_t *tr; + vlib_trace_buffer (vm, node, next0, first_b0, + /* follow_chain */ 0); + vlib_set_trace_count (vm, node, --n_trace); + tr = vlib_add_trace (vm, node, first_b0, sizeof (*tr)); + tr->next_index = next0; + tr->hw_if_index = mif->hw_if_index; + tr->ring = qid; + } + } + + /* enqueue buffer */ + to_next[0] = first_bi0; + to_next += 1; + n_left_to_next--; + + /* enqueue */ + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, + n_left_to_next, first_bi0, next0); + + /* next packet */ + n_rx_packets++; + n_rx_bytes += b0_total; + } + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + CLIB_MEMORY_STORE_BARRIER (); + ring->tail = head; + + vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters + + VNET_INTERFACE_COUNTER_RX, thread_index, + mif->hw_if_index, n_rx_packets, + n_rx_bytes); + + return n_rx_packets; +} + +static uword +memif_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 n_rx = 0; + memif_main_t *nm = &memif_main; + vnet_device_input_runtime_t *rt = (void *) node->runtime_data; + vnet_device_and_queue_t *dq; + + foreach_device_and_queue (dq, rt->devices_and_queues) + { + memif_if_t *mif; + mif = vec_elt_at_index (nm->interfaces, dq->dev_instance); + if ((mif->flags & MEMIF_IF_FLAG_ADMIN_UP) && + (mif->flags & MEMIF_IF_FLAG_CONNECTED)) + { + if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE) + { + if (mif->mode == MEMIF_INTERFACE_MODE_IP) + n_rx += memif_device_input_inline (vm, node, frame, mif, + MEMIF_RING_M2S, dq->queue_id, + MEMIF_INTERFACE_MODE_IP); + else + n_rx += memif_device_input_inline (vm, node, frame, mif, + MEMIF_RING_M2S, dq->queue_id, + MEMIF_INTERFACE_MODE_ETHERNET); + } + else + { + if (mif->mode == MEMIF_INTERFACE_MODE_IP) + n_rx += memif_device_input_inline (vm, node, frame, mif, + MEMIF_RING_S2M, dq->queue_id, + MEMIF_INTERFACE_MODE_IP); + else + n_rx += memif_device_input_inline (vm, node, frame, mif, + MEMIF_RING_S2M, dq->queue_id, + MEMIF_INTERFACE_MODE_ETHERNET); + } + } + } + + return n_rx; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (memif_input_node) = { + .function = memif_input_fn, + .name = "memif-input", + .sibling_of = "device-input", + .format_trace = format_memif_input_trace, + .type = VLIB_NODE_TYPE_INPUT, + .state = VLIB_NODE_STATE_INTERRUPT, + .n_errors = MEMIF_INPUT_N_ERROR, + .error_strings = memif_input_error_strings, +}; + +VLIB_NODE_FUNCTION_MULTIARCH (memif_input_node, memif_input_fn) +/* *INDENT-ON* */ + + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |