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authorNeale Ranns <nranns@cisco.com>2020-09-29 15:38:51 +0000
committerDamjan Marion <dmarion@me.com>2020-10-08 08:51:59 +0000
commit47a3d9975fa3af7a7537b565d6511dadc0df61fb (patch)
treefa33e3360af84239615f48b164b239ee3b660ee6 /src/vnet/l2/l2_input_node.c
parent83143710e80c8df703fe1ebc0e513aa37971d295 (diff)
l2: input performance
Type: improvement - cache the values form the BD on the input config to avoid loading - avoid the short write long read on the sequence number - use vlib_buffer_enqueue_to_next Signed-off-by: Neale Ranns <nranns@cisco.com> Change-Id: I33442b9104b457e4c638d26e9ad3bc965687a0bc
Diffstat (limited to 'src/vnet/l2/l2_input_node.c')
-rw-r--r--src/vnet/l2/l2_input_node.c401
1 files changed, 401 insertions, 0 deletions
diff --git a/src/vnet/l2/l2_input_node.c b/src/vnet/l2/l2_input_node.c
new file mode 100644
index 00000000000..898e16ab347
--- /dev/null
+++ b/src/vnet/l2/l2_input_node.c
@@ -0,0 +1,401 @@
+/*
+ * l2_input.c : layer 2 input packet processing
+ *
+ * Copyright (c) 2013 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 <vnet/vnet.h>
+#include <vnet/pg/pg.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/ethernet/packet.h>
+#include <vnet/ip/ip_packet.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/fib/fib_node.h>
+#include <vnet/ethernet/arp_packet.h>
+#include <vlib/cli.h>
+#include <vnet/l2/l2_input.h>
+#include <vnet/l2/l2_output.h>
+#include <vnet/l2/feat_bitmap.h>
+#include <vnet/l2/l2_bvi.h>
+#include <vnet/l2/l2_fib.h>
+#include <vnet/l2/l2_bd.h>
+
+#include <vppinfra/error.h>
+#include <vppinfra/hash.h>
+#include <vppinfra/cache.h>
+
+/**
+ * @file
+ * @brief Interface Input Mode (Layer 2 Cross-Connect or Bridge / Layer 3).
+ *
+ * This file contains the CLI Commands that modify the input mode of an
+ * interface. For interfaces in a Layer 2 cross-connect, all packets
+ * received on one interface will be transmitted to the other. For
+ * interfaces in a bridge-domain, packets will be forwarded to other
+ * interfaces in the same bridge-domain based on destination mac address.
+ * For interfaces in Layer 3 mode, the packets will be routed.
+ */
+
+typedef struct
+{
+ /* per-pkt trace data */
+ u8 dst_and_src[12];
+ u32 next_index;
+ u32 sw_if_index;
+ u32 feat_mask;
+} l2input_trace_t;
+
+/* packet trace format function */
+static u8 *
+format_l2input_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 *);
+ l2input_trace_t *t = va_arg (*args, l2input_trace_t *);
+
+ s = format (s, "l2-input: sw_if_index %d dst %U src %U [%U]",
+ t->sw_if_index,
+ format_ethernet_address, t->dst_and_src,
+ format_ethernet_address, t->dst_and_src + 6,
+ format_l2_input_feature_bitmap, t->feat_mask, 0);
+ return s;
+}
+
+extern l2input_main_t l2input_main;
+
+#ifndef CLIB_MARCH_VARIANT
+l2input_main_t l2input_main;
+#endif /* CLIB_MARCH_VARIANT */
+
+#define foreach_l2input_error \
+_(L2INPUT, "L2 input packets") \
+_(DROP, "L2 input drops")
+
+typedef enum
+{
+#define _(sym,str) L2INPUT_ERROR_##sym,
+ foreach_l2input_error
+#undef _
+ L2INPUT_N_ERROR,
+} l2input_error_t;
+
+static char *l2input_error_strings[] = {
+#define _(sym,string) string,
+ foreach_l2input_error
+#undef _
+};
+
+typedef enum
+{ /* */
+ L2INPUT_NEXT_LEARN,
+ L2INPUT_NEXT_FWD,
+ L2INPUT_NEXT_DROP,
+ L2INPUT_N_NEXT,
+} l2input_next_t;
+
+static_always_inline void
+classify_and_dispatch (l2input_main_t * msm, vlib_buffer_t * b0, u16 * next0)
+{
+ /*
+ * Load L2 input feature struct
+ * Load bridge domain struct
+ * Parse ethernet header to determine unicast/mcast/broadcast
+ * take L2 input stat
+ * classify packet as IP/UDP/TCP, control, other
+ * mask feature bitmap
+ * go to first node in bitmap
+ * Later: optimize VTM
+ *
+ * For L2XC,
+ * set tx sw-if-handle
+ */
+
+ u32 feat_mask = ~0;
+ u32 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ ethernet_header_t *h0 = vlib_buffer_get_current (b0);
+
+ /* Get config for the input interface */
+ l2_input_config_t *config = vec_elt_at_index (msm->configs, sw_if_index0);
+
+ /* Save split horizon group */
+ vnet_buffer (b0)->l2.shg = config->shg;
+
+ /* determine layer2 kind for stat and mask */
+ if (PREDICT_FALSE (ethernet_address_cast (h0->dst_address)))
+ {
+ u8 *l3h0 = (u8 *) h0 + vnet_buffer (b0)->l2.l2_len;
+
+#define get_u16(addr) ( *((u16 *)(addr)) )
+ u16 ethertype = clib_net_to_host_u16 (get_u16 (l3h0 - 2));
+ u8 protocol = ((ip6_header_t *) l3h0)->protocol;
+
+ /* Disable bridge forwarding (flooding will execute instead if not xconnect) */
+ feat_mask &= ~(L2INPUT_FEAT_FWD |
+ L2INPUT_FEAT_UU_FLOOD |
+ L2INPUT_FEAT_UU_FWD | L2INPUT_FEAT_GBP_FWD);
+
+ if (ethertype != ETHERNET_TYPE_ARP)
+ feat_mask &= ~(L2INPUT_FEAT_ARP_UFWD);
+
+ /* Disable ARP-term for non-ARP and non-ICMP6 packet */
+ if (ethertype != ETHERNET_TYPE_ARP &&
+ (ethertype != ETHERNET_TYPE_IP6 || protocol != IP_PROTOCOL_ICMP6))
+ feat_mask &= ~(L2INPUT_FEAT_ARP_TERM);
+ /*
+ * For packet from BVI - set SHG of ARP request or ICMPv6 neighbor
+ * solicitation packet from BVI to 0 so it can also flood to VXLAN
+ * tunnels or other ports with the same SHG as that of the BVI.
+ */
+ else if (PREDICT_FALSE (vnet_buffer (b0)->sw_if_index[VLIB_TX] ==
+ L2INPUT_BVI))
+ {
+ if (ethertype == ETHERNET_TYPE_ARP)
+ {
+ ethernet_arp_header_t *arp0 = (ethernet_arp_header_t *) l3h0;
+ if (arp0->opcode ==
+ clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request))
+ vnet_buffer (b0)->l2.shg = 0;
+ }
+ else /* must be ICMPv6 */
+ {
+ ip6_header_t *iph0 = (ip6_header_t *) l3h0;
+ icmp6_neighbor_solicitation_or_advertisement_header_t *ndh0;
+ ndh0 = ip6_next_header (iph0);
+ if (ndh0->icmp.type == ICMP6_neighbor_solicitation)
+ vnet_buffer (b0)->l2.shg = 0;
+ }
+ }
+ }
+ else
+ {
+ /*
+ * For packet from BVI - set SHG of unicast packet from BVI to 0 so it
+ * is not dropped on output to VXLAN tunnels or other ports with the
+ * same SHG as that of the BVI.
+ */
+ if (PREDICT_FALSE (vnet_buffer (b0)->sw_if_index[VLIB_TX] ==
+ L2INPUT_BVI))
+ vnet_buffer (b0)->l2.shg = 0;
+ }
+
+
+ if (l2_input_is_bridge (config))
+ {
+ /* Do bridge-domain processing */
+ /* save BD ID for next feature graph nodes */
+ vnet_buffer (b0)->l2.bd_index = config->bd_index;
+
+ /* Save bridge domain and interface seq_num */
+ vnet_buffer (b0)->l2.l2fib_sn = l2_fib_mk_seq_num
+ (config->bd_seq_num, config->seq_num);
+ vnet_buffer (b0)->l2.bd_age = config->bd_mac_age;
+
+ /*
+ * Process bridge domain feature enables.
+ * To perform learning/flooding/forwarding, the corresponding bit
+ * must be enabled in both the input interface config and in the
+ * bridge domain config. In the bd_bitmap, bits for features other
+ * than learning/flooding/forwarding should always be set.
+ */
+ feat_mask = feat_mask & config->bd_feature_bitmap;
+ }
+ else if (l2_input_is_xconnect (config))
+ {
+ /* Set the output interface */
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = config->output_sw_if_index;
+ }
+ else
+ feat_mask = L2INPUT_FEAT_DROP;
+
+ /* mask out features from bitmap using packet type and bd config */
+ u32 feature_bitmap = config->feature_bitmap & feat_mask;
+
+ /* save for next feature graph nodes */
+ vnet_buffer (b0)->l2.feature_bitmap = feature_bitmap;
+
+ /* Determine the next node */
+ *next0 = feat_bitmap_get_next_node_index (msm->feat_next_node_index,
+ feature_bitmap);
+}
+
+static_always_inline uword
+l2input_node_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame,
+ int do_trace)
+{
+ u32 n_left, *from;
+ l2input_next_t next_index;
+ l2input_main_t *msm = &l2input_main;
+ vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
+ u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
+
+ from = vlib_frame_vector_args (frame);
+ n_left = frame->n_vectors; /* number of packets to process */
+ next_index = node->cached_next_index;
+
+ vlib_get_buffers (vm, from, bufs, n_left);
+
+ while (n_left > 0)
+ {
+ while (n_left >= 8)
+ {
+ u32 sw_if_index0, sw_if_index1, sw_if_index2, sw_if_index3;
+
+ /* Prefetch next iteration. */
+ {
+ /* Prefetch the buffer header and packet for the N+2 loop iteration */
+ vlib_prefetch_buffer_header (b[4], LOAD);
+ vlib_prefetch_buffer_header (b[5], LOAD);
+ vlib_prefetch_buffer_header (b[6], LOAD);
+ vlib_prefetch_buffer_header (b[7], LOAD);
+
+ CLIB_PREFETCH (b[4]->data, CLIB_CACHE_LINE_BYTES, STORE);
+ CLIB_PREFETCH (b[5]->data, CLIB_CACHE_LINE_BYTES, STORE);
+ CLIB_PREFETCH (b[6]->data, CLIB_CACHE_LINE_BYTES, STORE);
+ CLIB_PREFETCH (b[7]->data, CLIB_CACHE_LINE_BYTES, STORE);
+ }
+
+ classify_and_dispatch (msm, b[0], &next[0]);
+ classify_and_dispatch (msm, b[1], &next[1]);
+ classify_and_dispatch (msm, b[2], &next[2]);
+ classify_and_dispatch (msm, b[3], &next[3]);
+
+ if (do_trace)
+ {
+ /* RX interface handles */
+ sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
+ sw_if_index1 = vnet_buffer (b[1])->sw_if_index[VLIB_RX];
+ sw_if_index2 = vnet_buffer (b[2])->sw_if_index[VLIB_RX];
+ sw_if_index3 = vnet_buffer (b[3])->sw_if_index[VLIB_RX];
+
+ if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ ethernet_header_t *h0 = vlib_buffer_get_current (b[0]);
+ l2input_trace_t *t =
+ vlib_add_trace (vm, node, b[0], sizeof (*t));
+ t->sw_if_index = sw_if_index0;
+ t->feat_mask = vnet_buffer (b[0])->l2.feature_bitmap;
+ clib_memcpy_fast (t->dst_and_src, h0->dst_address,
+ sizeof (h0->dst_address) +
+ sizeof (h0->src_address));
+ }
+ if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ ethernet_header_t *h1 = vlib_buffer_get_current (b[1]);
+ l2input_trace_t *t =
+ vlib_add_trace (vm, node, b[1], sizeof (*t));
+ t->sw_if_index = sw_if_index1;
+ t->feat_mask = vnet_buffer (b[1])->l2.feature_bitmap;
+ clib_memcpy_fast (t->dst_and_src, h1->dst_address,
+ sizeof (h1->dst_address) +
+ sizeof (h1->src_address));
+ }
+ if (b[2]->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ ethernet_header_t *h2 = vlib_buffer_get_current (b[2]);
+ l2input_trace_t *t =
+ vlib_add_trace (vm, node, b[2], sizeof (*t));
+ t->sw_if_index = sw_if_index2;
+ t->feat_mask = vnet_buffer (b[2])->l2.feature_bitmap;
+ clib_memcpy_fast (t->dst_and_src, h2->dst_address,
+ sizeof (h2->dst_address) +
+ sizeof (h2->src_address));
+ }
+ if (b[3]->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ ethernet_header_t *h3 = vlib_buffer_get_current (b[3]);
+ l2input_trace_t *t =
+ vlib_add_trace (vm, node, b[3], sizeof (*t));
+ t->sw_if_index = sw_if_index3;
+ t->feat_mask = vnet_buffer (b[3])->l2.feature_bitmap;
+ clib_memcpy_fast (t->dst_and_src, h3->dst_address,
+ sizeof (h3->dst_address) +
+ sizeof (h3->src_address));
+ }
+ }
+
+ b += 4;
+ n_left -= 4;
+ next += 4;
+ }
+
+ while (n_left > 0)
+ {
+ classify_and_dispatch (msm, b[0], &next[0]);
+
+ if (do_trace && PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ethernet_header_t *h0 = vlib_buffer_get_current (b[0]);
+ l2input_trace_t *t =
+ vlib_add_trace (vm, node, b[0], sizeof (*t));
+ t->sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
+ t->feat_mask = vnet_buffer (b[0])->l2.feature_bitmap;
+ clib_memcpy_fast (t->dst_and_src, h0->dst_address,
+ sizeof (h0->dst_address) +
+ sizeof (h0->src_address));
+ }
+
+ b += 1;
+ next += 1;
+ n_left -= 1;
+ }
+ }
+
+ vlib_node_increment_counter (vm, l2input_node.index,
+ L2INPUT_ERROR_L2INPUT, frame->n_vectors);
+
+ vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
+
+ return frame->n_vectors;
+}
+
+VLIB_NODE_FN (l2input_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
+ return l2input_node_inline (vm, node, frame, 1 /* do_trace */ );
+ return l2input_node_inline (vm, node, frame, 0 /* do_trace */ );
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (l2input_node) = {
+ .name = "l2-input",
+ .vector_size = sizeof (u32),
+ .format_trace = format_l2input_trace,
+ .format_buffer = format_ethernet_header_with_length,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(l2input_error_strings),
+ .error_strings = l2input_error_strings,
+
+ .n_next_nodes = L2INPUT_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [L2INPUT_NEXT_LEARN] = "l2-learn",
+ [L2INPUT_NEXT_FWD] = "l2-fwd",
+ [L2INPUT_NEXT_DROP] = "error-drop",
+ },
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */