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-rw-r--r--src/vnet/replication.h137
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+/*
+ * replication.h : packet replication
+ *
+ * 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.
+ */
+
+#ifndef included_replication_h
+#define included_replication_h
+
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/replication.h>
+
+
+typedef struct
+{
+ /* The entire vnet buffer header restored for each replica */
+ u8 vnet_buffer[40]; /* 16B aligned to allow vector unit copy */
+ u8 reserved[24]; /* space for future expansion of vnet buffer header */
+
+ /* feature state used during this replication */
+ u64 feature_replicas; /* feature's id for its set of replicas */
+ u32 feature_counter; /* feature's current index into set of replicas */
+ u32 recycle_node_index; /* feature's recycle node index */
+
+ /*
+ * data saved from the start of replication and restored
+ * at the end of replication
+ */
+ u32 saved_free_list_index; /* from vlib buffer */
+
+ /* data saved from the original packet and restored for each replica */
+ u64 l2_header[3]; /* 24B (must be at least 22B for l2 packets) */
+ u32 flags; /* vnet buffer flags */
+ u16 ip_tos; /* v4 and v6 */
+ u16 ip4_checksum; /* needed for v4 only */
+
+ /* data saved from the vlib buffer header and restored for each replica */
+ i16 current_data; /* offset of first byte of packet in packet data */
+ u8 pad[2]; /* to 64B */
+ u8 l2_packet; /* flag for l2 vs l3 packet data */
+
+} replication_context_t; /* 128B */
+
+
+typedef struct
+{
+
+ u32 recycle_list_index;
+
+ /* per-thread pools of replication contexts */
+ replication_context_t **contexts;
+
+ vlib_main_t *vlib_main;
+ vnet_main_t *vnet_main;
+
+} replication_main_t;
+
+
+extern replication_main_t replication_main;
+
+
+/* Return 1 if this buffer just came from the replication recycle handler. */
+always_inline u32
+replication_is_recycled (vlib_buffer_t * b0)
+{
+ return b0->flags & VLIB_BUFFER_IS_RECYCLED;
+}
+
+/*
+ * Clear the recycle flag. If buffer came from the replication recycle
+ * handler, this flag must be cleared before the packet is transmitted again.
+ */
+always_inline void
+replication_clear_recycled (vlib_buffer_t * b0)
+{
+ b0->flags &= ~VLIB_BUFFER_IS_RECYCLED;
+}
+
+/*
+ * Return the active replication context if this buffer has
+ * been recycled, otherwise return 0. (Note that this essentially
+ * restricts access to the replication context to the replication
+ * feature's prep and recycle nodes.)
+ */
+always_inline replication_context_t *
+replication_get_ctx (vlib_buffer_t * b0)
+{
+ replication_main_t *rm = &replication_main;
+
+ return replication_is_recycled (b0) ?
+ pool_elt_at_index (rm->contexts[vlib_get_thread_index ()],
+ b0->recycle_count) : 0;
+}
+
+/* Prefetch the replication context for this buffer, if it exists */
+always_inline void
+replication_prefetch_ctx (vlib_buffer_t * b0)
+{
+ replication_context_t *ctx = replication_get_ctx (b0);
+
+ if (ctx)
+ {
+ CLIB_PREFETCH (ctx, (2 * CLIB_CACHE_LINE_BYTES), STORE);
+ }
+}
+
+replication_context_t *replication_prep (vlib_main_t * vm,
+ vlib_buffer_t * b0,
+ u32 recycle_node_index,
+ u32 l2_packet);
+
+replication_context_t *replication_recycle (vlib_main_t * vm,
+ vlib_buffer_t * b0, u32 is_last);
+
+
+#endif
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */