diff options
author | Damjan Marion <damarion@cisco.com> | 2016-04-20 05:04:20 +0200 |
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committer | Dave Barach <openvpp@barachs.net> | 2016-04-25 14:24:03 +0000 |
commit | 108c7313854953ee3b66069b902f9fabb097ed25 (patch) | |
tree | 6588cffc536b8a6a0e3c33dd0325502d0db785ed /vnet/vnet/devices/netmap/node.c | |
parent | 68adab9267e6194e96d3ca4c325a9f8dae2e3120 (diff) |
Add native NETMAP driver
This is first drop of native NETMAP driver.
It is mainly tested with NETMAP pipes but also
support for native interfaces should work.
New CLI:
create netmap [<intf name>|valeXXX:YYY] [hw-addr <mac>] [pipe]
[master|slave]
Following example creates NETMAP pipe where VPP acts as master:
create netmap name vale00:vpp1 pipe master
then NETMAP pkt-gen tool can be used to send traffic:
pkt-gen -i vale00:vpp1}0 -f tx
Change-Id: Ie0ddaa5facc75285b78467420e8a9f9c8dfc39e5
Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'vnet/vnet/devices/netmap/node.c')
-rw-r--r-- | vnet/vnet/devices/netmap/node.c | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/vnet/vnet/devices/netmap/node.c b/vnet/vnet/devices/netmap/node.c new file mode 100644 index 00000000000..f866a282cfb --- /dev/null +++ b/vnet/vnet/devices/netmap/node.c @@ -0,0 +1,284 @@ +/* + *------------------------------------------------------------------ + * 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 <vlib/vlib.h> +#include <vlib/unix/unix.h> +#include <vnet/ethernet/ethernet.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 _ +}; + +enum { + NETMAP_INPUT_NEXT_DROP, + NETMAP_INPUT_NEXT_ETHERNET_INPUT, + NETMAP_INPUT_N_NEXT, +}; + +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; + +#if DPDK > 0 + struct rte_mbuf * mbuf = rte_mbuf_from_vlib_buffer(b); + struct rte_mbuf * first_mbuf = rte_mbuf_from_vlib_buffer(first_b); + struct rte_mbuf * prev_mbuf = rte_mbuf_from_vlib_buffer(prev_b); + first_mbuf->nb_segs++; + prev_mbuf->next = mbuf; + mbuf->data_len = b->current_length; + mbuf->data_off = RTE_PKTMBUF_HEADROOM + b->current_data; + mbuf->next = 0; +#endif +} + +always_inline uword +netmap_device_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame, u32 device_idx) +{ + u32 next_index = NETMAP_INPUT_NEXT_ETHERNET_INPUT; + uword n_trace = vlib_get_trace_count (vm, node); + netmap_main_t * nm = &netmap_main; + netmap_if_t * nif = pool_elt_at_index(nm->interfaces, device_idx); + 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 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); + if (PREDICT_FALSE(n_free_bufs < VLIB_FRAME_SIZE)) + { + vec_validate(nm->rx_buffers, VLIB_FRAME_SIZE + n_free_bufs - 1); + n_free_bufs += vlib_buffer_alloc(vm, &nm->rx_buffers[n_free_bufs], VLIB_FRAME_SIZE); + _vec_len (nm->rx_buffers) = 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 * b0, * 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) + { + /* grab free buffer */ + u32 last_empty_buffer = vec_len (nm->rx_buffers) - 1; + prev_bi0 = bi0; + bi0 = nm->rx_buffers[last_empty_buffer]; + b0 = vlib_get_buffer (vm, bi0); + _vec_len (nm->rx_buffers) = 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->clone_count = 0; + b0->current_length = bytes_to_copy; + + if (offset == 0) + { +#if DPDK > 0 + struct rte_mbuf * mb = rte_mbuf_from_vlib_buffer(b0); + rte_pktmbuf_data_len (mb) = b0->current_length; + rte_pktmbuf_pkt_len (mb) = b0->current_length; +#endif + 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)) + { + 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)); + } + /* 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, NIOCTXSYNC, 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; + + netmap_main_t * nm = &netmap_main; + + clib_bitmap_foreach (i, nm->pending_input_bitmap, + ({ + clib_bitmap_set (nm->pending_input_bitmap, i, 0); + n_rx_packets += netmap_device_input_fn(vm, node, frame, i); + })); + + return n_rx_packets; +} + + +VLIB_REGISTER_NODE (netmap_input_node) = { + .function = netmap_input_fn, + .name = "netmap-input", + .format_trace = format_netmap_input_trace, + .type = VLIB_NODE_TYPE_INPUT, + .state = VLIB_NODE_STATE_INTERRUPT, + .n_errors = NETMAP_INPUT_N_ERROR, + .error_strings = netmap_input_error_strings, + + .n_next_nodes = NETMAP_INPUT_N_NEXT, + .next_nodes = { + [NETMAP_INPUT_NEXT_DROP] = "error-drop", + [NETMAP_INPUT_NEXT_ETHERNET_INPUT] = "ethernet-input", + }, +}; + |