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Diffstat (limited to 'vnet/vnet/replication.h')
-rw-r--r-- | vnet/vnet/replication.h | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/vnet/vnet/replication.h b/vnet/vnet/replication.h new file mode 100644 index 00000000000..9de5717f4d3 --- /dev/null +++ b/vnet/vnet/replication.h @@ -0,0 +1,123 @@ +/* + * 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[32]; // 16B aligned to allow vector unit copy + u8 reserved[32]; // 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_clone_count; // from vlib buffer + 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) + 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[6]; // 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[os_get_cpu_number()], b0->clone_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 |