next_index == next0 == next1,
which means that the speculative enqueue at the top of the dual loop
has correctly dealt with both packets. In that case, the macro does
nothing at all.
@param vm vlib_main_t pointer, varies by thread
@param node current node vlib_node_runtime_t pointer
@param next_index speculated next index used for both packets
@param to_next speculated vector pointer used for both packets
@param n_left_to_next number of slots left in speculated vector
@param bi0 first buffer index
@param bi1 second buffer index
@param next0 actual next index to be used for the first packet
@param next1 actual next index to be used for the second packet
@return @c next_index -- speculative next index to be used for future packets
@return @c to_next -- speculative frame to be used for future packets
@return @c n_left_to_next -- number of slots left in speculative frame
*/
#define vlib_validate_buffer_enqueue_x2(vm,node,next_index,to_next,n_left_to_next,bi0,bi1,next0,next1) \
do { \
int enqueue_code = (next0 != next_index) + 2*(next1 != next_index); \
\
if (PREDICT_FALSE (enqueue_code != 0)) \
{ \
switch (enqueue_code) \
{ \
case 1: \
/* A B A */ \
to_next[-2] = bi1; \
to_next -= 1; \
n_left_to_next += 1; \
vlib_set_next_frame_buffer (vm, node, next0, bi0); \
break; \
\
case 2: \
/* A A B */ \
to_next -= 1; \
n_left_to_next += 1; \
vlib_set_next_frame_buffer (vm, node, next1, bi1); \
break; \
\
case 3: \
/* A B B or A B C */ \
to_next -= 2; \
n_left_to_next += 2; \
vlib_set_next_frame_buffer (vm, node, next0, bi0); \
vlib_set_next_frame_buffer (vm, node, next1, bi1); \
if (next0 == next1) \
{ \
vlib_put_next_frame (vm, node, next_index, \
n_left_to_next); \
next_index = next1; \
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); \
} \
} \
} \
} while (0)
/** \brief Finish enqueueing four buffers forward in the graph.
Standard quad loop boilerplate element. This is a MACRO,
with MULTIPLE SIDE EFFECTS. In the ideal case,
next_index == next0 == next1 == next2 == next3,
which means that the speculative enqueue at the top of the quad loop
has correctly dealt with all four packets. In that case, the macro does
nothing at all.
@param vm vlib_main_t pointer, varies by thread
@param node current node vlib_node_runtime_t pointer
@param next_index speculated next index used for both packets
@param to_next speculated vector pointer used for both packets
@param n_left_to_next number of slots left in speculated vector
@param bi0 first buffer index
@param bi1 second buffer index
@param bi2 third buffer index
@param bi3 fourth buffer index
@param next0 actual next index to be used for the first packet
@param next1 actual next index to be used for the second packet
@param next2 actual next index to be used for the third packet
@param next3 actual next index to be used for the fourth packet
@return @c next_index -- speculative next index to be used for future packets
@return @c to_next -- speculative frame to be used for future packets
@return @c n_left_to_next -- number of slots left in speculative frame
*/
#define vlib_validate_buffer_enqueue_x4(vm,node,next_index,to_next,n_left_to_next,bi0,bi1,bi2,bi3,next0,next1,next2,next3) \
do { \
/* After the fact: check the [speculative] enqueue to "next" */ \
u32 fix_speculation = (next_index ^ next0) | (next_index ^ next1) \
| (next_index ^ next2) | (next_index ^ next3); \
if (PREDICT_FALSE(fix_speculation)) \
{ \
/* rewind... */ \
to_next -= 4; \
n_left_to_next += 4; \
\
/* If bi0 belongs to "next", send it there */ \
if (next_index == next0) \
{ \
to_next[0] = bi0; \
to_next++; \
n_left_to_next --; \
} \
else /* send it where it needs to go */ \
vlib_set_next_frame_buffer (vm, node, next0, bi0); \
\
if (next_index == next1) \
{ \
to_next[0] = bi1; \
to_next++; \
n_left_to_next --; \
} \
else \
vlib_set_next_frame_buffer (vm, node, next1, bi1); \
\
if (next_index == next2) \
{ \
to_next[0] = bi2; \
to_next++; \
n_left_to_next --; \
} \
else \
vlib_set_next_frame_buffer (vm, node, next2, bi2); \
\
if (next_index == next3) \
{ \
to_next[0] = bi3; \
to_next++; \
n_left_to_next --; \
} \
else \
{ \
vlib_set_next_frame_buffer (vm, node, next3, bi3); \
\
/* Change speculation: last 2 packets went to the same node*/ \
if (next2 == next3) \
{ \
vlib_put_next_frame (vm, node, next_index, n_left_to_next); \
next_index = next3; \
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); \
} \
} \
} \
} while(0);
/** \brief Finish enqueueing one buffer forward in the graph.
Standard single loop boilerplate element. This is a MACRO,
with MULTIPLE SIDE EFFECTS. In the ideal case,
next_index == next0,
which means that the speculative enqueue at the top of the single loop
has correctly dealt with the packet in hand. In that case, the macro does
nothing at all.
@param vm vlib_main_t pointer, varies by thread
@param node current node vlib_node_runtime_t pointer
@p/*
* 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 co