diff options
Diffstat (limited to 'src/vnet/devices/netmap/node.c')
| -rw-r--r-- | src/vnet/devices/netmap/node.c | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/src/vnet/devices/netmap/node.c b/src/vnet/devices/netmap/node.c new file mode 100644 index 00000000000..19895e4754a --- /dev/null +++ b/src/vnet/devices/netmap/node.c @@ -0,0 +1,300 @@ +/* + *------------------------------------------------------------------ + * 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. + *------------------------------------------------------------------ + */ + +#include <stdint.h> +#include <net/if.h> +#include <sys/ioctl.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 <vnet/devices/netmap/net_netmap.h> +#include <vnet/devices/netmap/netmap.h> + +#define foreach_netmap_input_error + +typedef enum +{ +#define _(f,s) NETMAP_INPUT_ERROR_##f, + foreach_netmap_input_error +#undef _ + NETMAP_INPUT_N_ERROR, +} netmap_input_error_t; + +static char *netmap_input_error_strings[] = { +#define _(n,s) s, + foreach_netmap_input_error +#undef _ +}; + +typedef struct +{ + u32 next_index; + u32 hw_if_index; + struct netmap_slot slot; +} netmap_input_trace_t; + +static u8 * +format_netmap_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 *); + netmap_input_trace_t *t = va_arg (*args, netmap_input_trace_t *); + uword indent = format_get_indent (s); + + s = format (s, "netmap: hw_if_index %d next-index %d", + t->hw_if_index, t->next_index); + s = format (s, "\n%Uslot: flags 0x%x len %u buf_idx %u", + format_white_space, indent + 2, + t->slot.flags, t->slot.len, t->slot.buf_idx); + return s; +} + +always_inline void +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; +} + +always_inline uword +netmap_device_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame, netmap_if_t * nif) +{ + u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; + uword n_trace = vlib_get_trace_count (vm, node); + netmap_main_t *nm = &netmap_main; + u32 n_rx_packets = 0; + u32 n_rx_bytes = 0; + u32 *to_next = 0; + u32 n_free_bufs; + struct netmap_ring *ring; + int cur_ring; + u32 cpu_index = os_get_cpu_number (); + u32 n_buffer_bytes = vlib_buffer_free_list_buffer_size (vm, + VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX); + + if (nif->per_interface_next_index != ~0) + next_index = nif->per_interface_next_index; + + n_free_bufs = vec_len (nm->rx_buffers[cpu_index]); + if (PREDICT_FALSE (n_free_bufs < VLIB_FRAME_SIZE)) + { + vec_validate (nm->rx_buffers[cpu_index], + VLIB_FRAME_SIZE + n_free_bufs - 1); + n_free_bufs += + vlib_buffer_alloc (vm, &nm->rx_buffers[cpu_index][n_free_bufs], + VLIB_FRAME_SIZE); + _vec_len (nm->rx_buffers[cpu_index]) = n_free_bufs; + } + + cur_ring = nif->first_rx_ring; + while (cur_ring <= nif->last_rx_ring && n_free_bufs) + { + int r = 0; + u32 cur_slot_index; + ring = NETMAP_RXRING (nif->nifp, cur_ring); + r = nm_ring_space (ring); + + if (!r) + { + cur_ring++; + continue; + } + + if (r > n_free_bufs) + r = n_free_bufs; + + cur_slot_index = ring->cur; + while (r) + { + u32 n_left_to_next; + u32 next0 = next_index; + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (r && n_left_to_next) + { + vlib_buffer_t *first_b0 = 0; + u32 offset = 0; + u32 bi0 = 0, first_bi0 = 0, prev_bi0; + u32 next_slot_index = (cur_slot_index + 1) % ring->num_slots; + u32 next2_slot_index = (cur_slot_index + 2) % ring->num_slots; + struct netmap_slot *slot = &ring->slot[cur_slot_index]; + u32 data_len = slot->len; + + /* prefetch 2 slots in advance */ + CLIB_PREFETCH (&ring->slot[next2_slot_index], + CLIB_CACHE_LINE_BYTES, LOAD); + /* prefetch start of next packet */ + CLIB_PREFETCH (NETMAP_BUF + (ring, ring->slot[next_slot_index].buf_idx), + CLIB_CACHE_LINE_BYTES, LOAD); + + while (data_len && n_free_bufs) + { + vlib_buffer_t *b0; + /* grab free buffer */ + u32 last_empty_buffer = + vec_len (nm->rx_buffers[cpu_index]) - 1; + prev_bi0 = bi0; + bi0 = nm->rx_buffers[cpu_index][last_empty_buffer]; + b0 = vlib_get_buffer (vm, bi0); + _vec_len (nm->rx_buffers[cpu_index]) = last_empty_buffer; + n_free_bufs--; + + /* copy data */ + u32 bytes_to_copy = + data_len > n_buffer_bytes ? n_buffer_bytes : data_len; + b0->current_data = 0; + clib_memcpy (vlib_buffer_get_current (b0), + (u8 *) NETMAP_BUF (ring, + slot->buf_idx) + offset, + bytes_to_copy); + + /* fill buffer header */ + b0->current_length = bytes_to_copy; + + if (offset == 0) + { + b0->total_length_not_including_first_buffer = 0; + b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID; + vnet_buffer (b0)->sw_if_index[VLIB_RX] = + nif->sw_if_index; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; + first_bi0 = bi0; + first_b0 = vlib_get_buffer (vm, first_bi0); + } + else + buffer_add_to_chain (vm, bi0, first_bi0, prev_bi0); + + offset += bytes_to_copy; + data_len -= bytes_to_copy; + } + + /* trace */ + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (first_b0); + if (PREDICT_FALSE (n_trace > 0)) + { + if (PREDICT_TRUE (first_b0 != 0)) + { + netmap_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 = nif->hw_if_index; + memcpy (&tr->slot, slot, sizeof (struct netmap_slot)); + } + } + + /* redirect if feature path enabled */ + vnet_feature_start_device_input_x1 (nif->sw_if_index, &next0, + first_b0, 0); + + /* enque and take next packet */ + 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 += slot->len; + to_next[0] = first_bi0; + to_next += 1; + n_left_to_next--; + cur_slot_index = next_slot_index; + + r--; + } + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + ring->head = ring->cur = cur_slot_index; + cur_ring++; + } + + if (n_rx_packets) + ioctl (nif->fd, NIOCRXSYNC, NULL); + + vlib_increment_combined_counter + (vnet_get_main ()->interface_main.combined_sw_if_counters + + VNET_INTERFACE_COUNTER_RX, + os_get_cpu_number (), nif->hw_if_index, n_rx_packets, n_rx_bytes); + + return n_rx_packets; +} + +static uword +netmap_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + int i; + u32 n_rx_packets = 0; + u32 cpu_index = os_get_cpu_number (); + netmap_main_t *nm = &netmap_main; + netmap_if_t *nmi; + + for (i = 0; i < vec_len (nm->interfaces); i++) + { + nmi = vec_elt_at_index (nm->interfaces, i); + if (nmi->is_admin_up && + (i % nm->input_cpu_count) == + (cpu_index - nm->input_cpu_first_index)) + n_rx_packets += netmap_device_input_fn (vm, node, frame, nmi); + } + + return n_rx_packets; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (netmap_input_node) = { + .function = netmap_input_fn, + .name = "netmap-input", + .sibling_of = "device-input", + .format_trace = format_netmap_input_trace, + .type = VLIB_NODE_TYPE_INPUT, + /* default state is INTERRUPT mode, switch to POLLING if worker threads are enabled */ + .state = VLIB_NODE_STATE_INTERRUPT, + .n_errors = NETMAP_INPUT_N_ERROR, + .error_strings = netmap_input_error_strings, +}; + +VLIB_NODE_FUNCTION_MULTIARCH (netmap_input_node, netmap_input_fn) +/* *INDENT-ON* */ + + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |