diff options
Diffstat (limited to 'src/vlib/buffer.h')
| -rw-r--r-- | src/vlib/buffer.h | 112 |
1 files changed, 64 insertions, 48 deletions
diff --git a/src/vlib/buffer.h b/src/vlib/buffer.h index 2a5af210330..4de2deab7d0 100644 --- a/src/vlib/buffer.h +++ b/src/vlib/buffer.h @@ -107,62 +107,78 @@ enum #define VLIB_BUFFER_TRACE_TRAJECTORY 0 #endif /* VLIB_BUFFER_TRACE_TRAJECTORY */ +#define vlib_buffer_template_fields \ + /** signed offset in data[], pre_data[] that we are currently \ + * processing. If negative current header points into predata area. */ \ + i16 current_data; \ + \ + /** Nbytes between current data and the end of this buffer. */ \ + u16 current_length; \ + /** buffer flags: \ + <br> VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list \ + index, <br> VLIB_BUFFER_IS_TRACED: trace this buffer. <br> \ + VLIB_BUFFER_NEXT_PRESENT: this is a multi-chunk buffer. <br> \ + VLIB_BUFFER_TOTAL_LENGTH_VALID: as it says <br> \ + VLIB_BUFFER_EXT_HDR_VALID: buffer contains valid external buffer manager \ + header, set to avoid adding it to a flow report <br> \ + VLIB_BUFFER_FLAG_USER(n): user-defined bit N \ + */ \ + u32 flags; \ + \ + /** Generic flow identifier */ \ + u32 flow_id; \ + \ + /** Reference count for this buffer. */ \ + volatile u8 ref_count; \ + \ + /** index of buffer pool this buffer belongs. */ \ + u8 buffer_pool_index; \ + \ + /** Error code for buffers to be enqueued to error handler. */ \ + vlib_error_t error; \ + \ + /** Next buffer for this linked-list of buffers. Only valid if \ + * VLIB_BUFFER_NEXT_PRESENT flag is set. */ \ + u32 next_buffer; \ + \ + /** The following fields can be in a union because once a packet enters \ + * the punt path, it is no longer on a feature arc */ \ + union \ + { \ + /** Used by feature subgraph arcs to visit enabled feature nodes */ \ + u32 current_config_index; \ + /* the reason the packet once punted */ \ + u32 punt_reason; \ + }; \ + \ + /** Opaque data used by sub-graphs for their own purposes. */ \ + u32 opaque[10]; + +typedef struct +{ + CLIB_ALIGN_MARK (align_mark, 64); + vlib_buffer_template_fields +} vlib_buffer_template_t; + +STATIC_ASSERT_SIZEOF (vlib_buffer_template_t, 64); + /** VLIB buffer representation. */ typedef union { + CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); struct { - CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); - - /** signed offset in data[], pre_data[] that we are currently - * processing. If negative current header points into predata area. */ - i16 current_data; - - /** Nbytes between current data and the end of this buffer. */ - u16 current_length; - - /** buffer flags: - <br> VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, - <br> VLIB_BUFFER_IS_TRACED: trace this buffer. - <br> VLIB_BUFFER_NEXT_PRESENT: this is a multi-chunk buffer. - <br> VLIB_BUFFER_TOTAL_LENGTH_VALID: as it says - <br> VLIB_BUFFER_EXT_HDR_VALID: buffer contains valid external buffer manager header, - set to avoid adding it to a flow report - <br> VLIB_BUFFER_FLAG_USER(n): user-defined bit N - */ - u32 flags; - - /** Generic flow identifier */ - u32 flow_id; - - /** Reference count for this buffer. */ - volatile u8 ref_count; - - /** index of buffer pool this buffer belongs. */ - u8 buffer_pool_index; - - /** Error code for buffers to be enqueued to error handler. */ - vlib_error_t error; - - /** Next buffer for this linked-list of buffers. Only valid if - * VLIB_BUFFER_NEXT_PRESENT flag is set. */ - u32 next_buffer; - - /** The following fields can be in a union because once a packet enters - * the punt path, it is no longer on a feature arc */ union { - /** Used by feature subgraph arcs to visit enabled feature nodes */ - u32 current_config_index; - /* the reason the packet once punted */ - u32 punt_reason; + struct + { + vlib_buffer_template_fields + }; + vlib_buffer_template_t template; }; - /** Opaque data used by sub-graphs for their own purposes. */ - u32 opaque[10]; - - /** part of buffer metadata which is initialized on alloc ends here. */ - STRUCT_MARK (template_end); + /* Data above is initialized or zeroed on alloc, data bellow is not + * and it is app responsibility to ensure data is valid */ /** start of 2nd half (2nd cacheline on systems where cacheline size is 64) */ CLIB_ALIGN_MARK (second_half, 64); @@ -468,7 +484,7 @@ typedef struct vlib_buffer_pool_thread_t *threads; /* buffer metadata template */ - vlib_buffer_t buffer_template; + vlib_buffer_template_t buffer_template; } vlib_buffer_pool_t; #define VLIB_BUFFER_MAX_NUMA_NODES 32 |