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authorDamjan Marion <damarion@cisco.com>2016-12-19 23:05:39 +0100
committerDamjan Marion <damarion@cisco.com>2016-12-28 12:25:14 +0100
commit7cd468a3d7dee7d6c92f69a0bb7061ae208ec727 (patch)
tree5de62f8dbd3a752f5a676ca600e43d2652d1ff1a /src/vnet/sr/sr_replicate.c
parent696f1adec0df3b8f161862566dd9c86174302658 (diff)
Reorganize source tree to use single autotools instance
Change-Id: I7b51f88292e057c6443b12224486f2d0c9f8ae23 Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vnet/sr/sr_replicate.c')
-rw-r--r--src/vnet/sr/sr_replicate.c490
1 files changed, 490 insertions, 0 deletions
diff --git a/src/vnet/sr/sr_replicate.c b/src/vnet/sr/sr_replicate.c
new file mode 100644
index 00000000000..5f9de5042af
--- /dev/null
+++ b/src/vnet/sr/sr_replicate.c
@@ -0,0 +1,490 @@
+/*
+ * sr_replicate.c: ipv6 segment routing replicator for multicast
+ *
+ * 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.
+ */
+/**
+ * @file
+ * @brief Functions for replicating packets across SR tunnels.
+ *
+ * Leverages rte_pktmbuf_clone() so there is no memcpy for
+ * invariant parts of the packet.
+ *
+ * @note Currently requires DPDK
+*/
+
+#if DPDK > 0 /* Cannot run replicate without DPDK */
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/pg/pg.h>
+#include <vnet/sr/sr.h>
+#include <vnet/devices/dpdk/dpdk.h>
+#include <vnet/ip/ip.h>
+#include <vnet/fib/ip6_fib.h>
+
+#include <vppinfra/hash.h>
+#include <vppinfra/error.h>
+#include <vppinfra/elog.h>
+
+/**
+ * @brief sr_replicate state.
+ *
+*/
+typedef struct
+{
+ /* convenience */
+ vlib_main_t *vlib_main;
+ vnet_main_t *vnet_main;
+} sr_replicate_main_t;
+
+sr_replicate_main_t sr_replicate_main;
+
+/**
+ * @brief Information to display in packet trace.
+ *
+*/
+typedef struct
+{
+ ip6_address_t src, dst;
+ u16 length;
+ u32 next_index;
+ u32 tunnel_index;
+ u8 sr[256];
+} sr_replicate_trace_t;
+
+/**
+ * @brief packet trace format function.
+ *
+ * @param *s u8 used for string output
+ * @param *args va_list structured input to va_arg to output @ref sr_replicate_trace_t
+ * @return *s u8 - formatted trace output
+*/
+static u8 *
+format_sr_replicate_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 *);
+ sr_replicate_trace_t *t = va_arg (*args, sr_replicate_trace_t *);
+ ip6_sr_main_t *sm = &sr_main;
+ ip6_sr_tunnel_t *tun = pool_elt_at_index (sm->tunnels, t->tunnel_index);
+ ip6_fib_t *rx_fib, *tx_fib;
+
+ rx_fib = ip6_fib_get (tun->rx_fib_index);
+ tx_fib = ip6_fib_get (tun->tx_fib_index);
+
+ s = format
+ (s, "SR-REPLICATE: next %s ip6 src %U dst %U len %u\n"
+ " rx-fib-id %d tx-fib-id %d\n%U",
+ "ip6-lookup",
+ format_ip6_address, &t->src,
+ format_ip6_address, &t->dst, t->length,
+ rx_fib->table_id, tx_fib->table_id,
+ format_ip6_sr_header, t->sr, 0 /* print_hmac */ );
+ return s;
+
+}
+
+#define foreach_sr_replicate_error \
+_(REPLICATED, "sr packets replicated") \
+_(NO_BUFFERS, "error allocating buffers for replicas") \
+_(NO_REPLICAS, "no replicas were needed") \
+_(NO_BUFFER_DROPS, "sr no buffer drops")
+
+/**
+ * @brief Struct for SR replicate errors
+ */
+typedef enum
+{
+#define _(sym,str) SR_REPLICATE_ERROR_##sym,
+ foreach_sr_replicate_error
+#undef _
+ SR_REPLICATE_N_ERROR,
+} sr_replicate_error_t;
+
+/**
+ * @brief Error strings for SR replicate
+ */
+static char *sr_replicate_error_strings[] = {
+#define _(sym,string) string,
+ foreach_sr_replicate_error
+#undef _
+};
+
+/**
+ * @brief Defines next-nodes for packet processing.
+ *
+*/
+typedef enum
+{
+ SR_REPLICATE_NEXT_IP6_LOOKUP,
+ SR_REPLICATE_N_NEXT,
+} sr_replicate_next_t;
+
+/**
+ * @brief Single loop packet replicator.
+ *
+ * @node sr-replicate
+ * @param vm vlib_main_t
+ * @return frame->n_vectors uword
+*/
+static uword
+sr_replicate_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ u32 n_left_from, *from, *to_next;
+ sr_replicate_next_t next_index;
+ int pkts_replicated = 0;
+ ip6_sr_main_t *sm = &sr_main;
+ int no_buffer_drops = 0;
+ vlib_buffer_free_list_t *fl;
+ unsigned socket_id = rte_socket_id ();
+ vlib_buffer_main_t *bm = vm->buffer_main;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ fl = vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0, hdr_bi0;
+ vlib_buffer_t *b0, *orig_b0;
+ struct rte_mbuf *orig_mb0 = 0, *hdr_mb0 = 0, *clone0 = 0;
+ struct rte_mbuf **hdr_vec = 0, **rte_mbuf_vec = 0;
+ ip6_sr_policy_t *pol0 = 0;
+ ip6_sr_tunnel_t *t0 = 0;
+ ip6_sr_header_t *hdr_sr0 = 0;
+ ip6_header_t *ip0 = 0, *hdr_ip0 = 0;
+ int num_replicas = 0;
+ int i;
+ u32 len_bytes = sizeof (ip6_header_t);
+ u8 next_hdr, ip_next_hdr = IPPROTO_IPV6_ROUTE;
+
+ bi0 = from[0];
+
+ b0 = vlib_get_buffer (vm, bi0);
+ orig_b0 = b0;
+
+ pol0 = pool_elt_at_index (sm->policies,
+ vnet_buffer (b0)->ip.save_protocol);
+
+ ip0 = vlib_buffer_get_current (b0);
+ /* Skip forward to the punch-in point */
+ vlib_buffer_advance (b0, sizeof (*ip0));
+ next_hdr = ip0->protocol;
+
+ /* HBH must immediately follow ipv6 header */
+ if (PREDICT_FALSE
+ (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
+ {
+ ip6_hop_by_hop_ext_t *ext_hdr =
+ (ip6_hop_by_hop_ext_t *) ip6_next_header (ip0);
+ u32 ext_hdr_len = 0;
+ ext_hdr_len = ip6_ext_header_len ((ip6_ext_header_t *) ext_hdr);
+ len_bytes += ext_hdr_len;
+ next_hdr = ext_hdr->next_hdr;
+ ext_hdr->next_hdr = IPPROTO_IPV6_ROUTE;
+ ip_next_hdr = IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS;
+ /* Skip forward to the punch-in point */
+ vlib_buffer_advance (b0, ext_hdr_len);
+
+ }
+
+ orig_mb0 = rte_mbuf_from_vlib_buffer (b0);
+
+ i16 delta0 = vlib_buffer_length_in_chain (vm, orig_b0)
+ - (i16) orig_mb0->pkt_len;
+
+ u16 new_data_len0 = (u16) ((i16) orig_mb0->data_len + delta0);
+ u16 new_pkt_len0 = (u16) ((i16) orig_mb0->pkt_len + delta0);
+
+ orig_mb0->data_len = new_data_len0;
+ orig_mb0->pkt_len = new_pkt_len0;
+ orig_mb0->data_off += (u16) (b0->current_data);
+
+ /*
+ Before entering loop determine if we can allocate:
+ - all the new HEADER RTE_MBUFs and assign them to a vector
+ - all the clones
+
+ if successful, then iterate over vectors of resources
+
+ */
+ num_replicas = vec_len (pol0->tunnel_indices);
+
+ if (PREDICT_FALSE (num_replicas == 0))
+ {
+ b0->error = node->errors[SR_REPLICATE_ERROR_NO_REPLICAS];
+ goto do_trace0;
+ }
+
+ vec_reset_length (hdr_vec);
+ vec_reset_length (rte_mbuf_vec);
+
+ for (i = 0; i < num_replicas; i++)
+ {
+ uint8_t nb_seg;
+ struct rte_mbuf *clone0i;
+ vlib_buffer_t *clone0_c, *clone_b0;
+
+ t0 = vec_elt_at_index (sm->tunnels, pol0->tunnel_indices[i]);
+ hdr_mb0 = rte_pktmbuf_alloc (bm->pktmbuf_pools[socket_id]);
+
+ if (i < (num_replicas - 1))
+ {
+ /* Not the last tunnel to process */
+ clone0 = rte_pktmbuf_clone
+ (orig_mb0, bm->pktmbuf_pools[socket_id]);
+ if (clone0 == 0)
+ goto clone_fail;
+ nb_seg = 0;
+ clone0i = clone0;
+ clone0_c = NULL;
+ while ((clone0->nb_segs >= 1) && (nb_seg < clone0->nb_segs))
+ {
+
+ clone_b0 = vlib_buffer_from_rte_mbuf (clone0i);
+ vlib_buffer_init_for_free_list (clone_b0, fl);
+
+ ASSERT ((clone_b0->flags & VLIB_BUFFER_NEXT_PRESENT) ==
+ 0);
+ ASSERT (clone_b0->current_data == 0);
+
+ clone_b0->current_data =
+ (clone0i->buf_addr + clone0i->data_off) -
+ (void *) clone_b0->data;
+
+ clone_b0->current_length = clone0i->data_len;
+ if (PREDICT_FALSE (clone0_c != NULL))
+ {
+ clone0_c->flags |= VLIB_BUFFER_NEXT_PRESENT;
+ clone0_c->next_buffer =
+ vlib_get_buffer_index (vm, clone_b0);
+ }
+ clone0_c = clone_b0;
+ clone0i = clone0i->next;
+ nb_seg++;
+ }
+ }
+ else
+ /* First tunnel to process, use original MB */
+ clone0 = orig_mb0;
+
+
+ if (PREDICT_FALSE (!clone0 || !hdr_mb0))
+ {
+ clone_fail:
+ b0->error = node->errors[SR_REPLICATE_ERROR_NO_BUFFERS];
+
+ vec_foreach_index (i, rte_mbuf_vec)
+ {
+ rte_pktmbuf_free (rte_mbuf_vec[i]);
+ }
+ vec_free (rte_mbuf_vec);
+
+ vec_foreach_index (i, hdr_vec)
+ {
+ rte_pktmbuf_free (hdr_vec[i]);
+ }
+ vec_free (hdr_vec);
+
+ goto do_trace0;
+ }
+
+ vec_add1 (hdr_vec, hdr_mb0);
+ vec_add1 (rte_mbuf_vec, clone0);
+
+ }
+
+ for (i = 0; i < num_replicas; i++)
+ {
+ vlib_buffer_t *hdr_b0;
+ u16 new_l0 = 0;
+
+ t0 = vec_elt_at_index (sm->tunnels, pol0->tunnel_indices[i]);
+ /* Our replicas */
+ hdr_mb0 = hdr_vec[i];
+ clone0 = rte_mbuf_vec[i];
+
+ hdr_mb0->data_len = len_bytes + vec_len (t0->rewrite);
+ hdr_mb0->pkt_len = hdr_mb0->data_len +
+ vlib_buffer_length_in_chain (vm, orig_b0);
+
+ hdr_b0 = vlib_buffer_from_rte_mbuf (hdr_mb0);
+
+ vlib_buffer_init_for_free_list (hdr_b0, fl);
+
+ memcpy (hdr_b0->data, ip0, len_bytes);
+ memcpy (hdr_b0->data + len_bytes, t0->rewrite,
+ vec_len (t0->rewrite));
+
+ hdr_b0->current_data = 0;
+ hdr_b0->current_length = len_bytes + vec_len (t0->rewrite);
+ hdr_b0->flags = orig_b0->flags | VLIB_BUFFER_NEXT_PRESENT;
+ hdr_b0->trace_index = orig_b0->trace_index;
+ vnet_buffer (hdr_b0)->l2_classify.opaque_index = 0;
+
+ hdr_b0->total_length_not_including_first_buffer =
+ hdr_mb0->pkt_len - hdr_b0->current_length;
+ vnet_buffer (hdr_b0)->sw_if_index[VLIB_TX] = t0->tx_fib_index;
+
+ hdr_ip0 = (ip6_header_t *) hdr_b0->data;
+ new_l0 = clib_net_to_host_u16 (ip0->payload_length) +
+ vec_len (t0->rewrite);
+ hdr_ip0->payload_length = clib_host_to_net_u16 (new_l0);
+ hdr_sr0 = (ip6_sr_header_t *) ((u8 *) hdr_ip0 + len_bytes);
+ /* $$$ tune */
+ clib_memcpy (hdr_sr0, t0->rewrite, vec_len (t0->rewrite));
+ hdr_sr0->protocol = next_hdr;
+ hdr_ip0->protocol = ip_next_hdr;
+
+ /* Copy dst address into the DA slot in the segment list */
+ clib_memcpy (hdr_sr0->segments, ip0->dst_address.as_u64,
+ sizeof (ip6_address_t));
+
+ /* Rewrite the ip6 dst address */
+ hdr_ip0->dst_address.as_u64[0] = t0->first_hop.as_u64[0];
+ hdr_ip0->dst_address.as_u64[1] = t0->first_hop.as_u64[1];
+
+ sr_fix_hmac (sm, hdr_ip0, hdr_sr0);
+
+ /* prepend new header to invariant piece */
+ hdr_mb0->next = clone0;
+ hdr_b0->next_buffer =
+ vlib_get_buffer_index (vm,
+ vlib_buffer_from_rte_mbuf (clone0));
+
+ /* update header's fields */
+ hdr_mb0->pkt_len =
+ (uint16_t) (hdr_mb0->data_len + clone0->pkt_len);
+ hdr_mb0->nb_segs = (uint8_t) (clone0->nb_segs + 1);
+
+ /* copy metadata from source packet */
+ hdr_mb0->port = clone0->port;
+ hdr_mb0->vlan_tci = clone0->vlan_tci;
+ hdr_mb0->vlan_tci_outer = clone0->vlan_tci_outer;
+ hdr_mb0->tx_offload = clone0->tx_offload;
+ hdr_mb0->hash = clone0->hash;
+
+ hdr_mb0->ol_flags = clone0->ol_flags & ~(IND_ATTACHED_MBUF);
+
+ __rte_mbuf_sanity_check (hdr_mb0, 1);
+
+ hdr_bi0 = vlib_get_buffer_index (vm, hdr_b0);
+
+ to_next[0] = hdr_bi0;
+ to_next += 1;
+ n_left_to_next -= 1;
+
+ if (n_left_to_next == 0)
+ {
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ vlib_get_next_frame (vm, node, next_index,
+ to_next, n_left_to_next);
+
+ }
+ pkts_replicated++;
+ }
+
+ from += 1;
+ n_left_from -= 1;
+
+ do_trace0:
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ sr_replicate_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->tunnel_index = t0 - sm->tunnels;
+ tr->length = 0;
+ if (hdr_ip0)
+ {
+ memcpy (tr->src.as_u8, hdr_ip0->src_address.as_u8,
+ sizeof (tr->src.as_u8));
+ memcpy (tr->dst.as_u8, hdr_ip0->dst_address.as_u8,
+ sizeof (tr->dst.as_u8));
+ if (hdr_ip0->payload_length)
+ tr->length = clib_net_to_host_u16
+ (hdr_ip0->payload_length);
+ }
+ tr->next_index = next_index;
+ if (hdr_sr0)
+ memcpy (tr->sr, hdr_sr0, sizeof (tr->sr));
+ }
+
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, sr_replicate_node.index,
+ SR_REPLICATE_ERROR_REPLICATED,
+ pkts_replicated);
+
+ vlib_node_increment_counter (vm, sr_replicate_node.index,
+ SR_REPLICATE_ERROR_NO_BUFFER_DROPS,
+ no_buffer_drops);
+
+ return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (sr_replicate_node) = {
+ .function = sr_replicate_node_fn,
+ .name = "sr-replicate",
+ .vector_size = sizeof (u32),
+ .format_trace = format_sr_replicate_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(sr_replicate_error_strings),
+ .error_strings = sr_replicate_error_strings,
+
+ .n_next_nodes = SR_REPLICATE_N_NEXT,
+
+ .next_nodes = {
+ [SR_REPLICATE_NEXT_IP6_LOOKUP] = "ip6-lookup",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (sr_replicate_node, sr_replicate_node_fn)
+/* *INDENT-ON* */
+
+clib_error_t *
+sr_replicate_init (vlib_main_t * vm)
+{
+ sr_replicate_main_t *msm = &sr_replicate_main;
+
+ msm->vlib_main = vm;
+ msm->vnet_main = vnet_get_main ();
+
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (sr_replicate_init);
+
+#endif /* DPDK */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */