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/*
* 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.
*/
#include <vnet/fib/fib_source.h>
static const char *fib_source_names[] = FIB_SOURCES;
static const char *fib_source_behaviour_names[] = FIB_SOURCE_BEHAVIOURS;
static fib_source_t fib_source_id = FIB_SOURCE_LAST+1;
typedef struct fib_source_prio_t_
{
fib_source_priority_t fsp_class;
fib_source_priority_t fsp_slot;
} fib_source_prio_t;
/**
* for each client requested priority count the number pf uses of
* that prio so we can asign is usage a slot number, and therefore
* each request will have a unique value.
*/
STATIC_ASSERT_SIZEOF(fib_source_priority_t, 1);
static fib_source_priority_t fib_source_prio_by_class[0x100];
typedef struct fib_source_reg_t_
{
fib_source_t fsr_source;
const char *fsr_name;
fib_source_behaviour_t fsr_behaviour;
fib_source_prio_t fsr_prio;
} fib_source_reg_t;
static fib_source_reg_t *fib_source_regs;
u16
fib_source_get_prio (fib_source_t src)
{
ASSERT(vec_len(fib_source_regs) > src);
return (((u16)fib_source_regs[src].fsr_prio.fsp_class << 8) |
fib_source_regs[src].fsr_prio.fsp_slot);
}
fib_source_behaviour_t
fib_source_get_behaviour (fib_source_t src)
{
ASSERT(vec_len(fib_source_regs) > src);
return (fib_source_regs[src].fsr_behaviour);
}
u8 *
format_fib_source (u8 *s, va_list *a)
{
fib_source_t src = va_arg(*a, int);
ASSERT(vec_len(fib_source_regs) > src);
return (format(s, "%s", fib_source_regs[src].fsr_name));
}
fib_source_priority_cmp_t
fib_source_cmp (fib_source_t s1,
fib_source_t s2)
{
if (fib_source_get_prio(s1) <
fib_source_get_prio(s2))
{
return (FIB_SOURCE_CMP_BETTER);
}
else if (fib_source_get_prio(s1) >
fib_source_get_prio(s2))
{
return (FIB_SOURCE_CMP_WORSE);
}
return (FIB_SOURCE_CMP_EQUAL);
}
static void
fib_source_reg_init (fib_source_t src,
const char *name,
fib_source_priority_t prio,
fib_source_behaviour_t bh)
{
fib_source_priority_t slot;
fib_source_reg_t *fsr;
/*
* ensure we assign a unique priority to each request
* otherwise different source will be treated like ECMP
*/
slot = fib_source_prio_by_class[prio]++;
vec_validate(fib_source_regs, src);
fsr = &fib_source_regs[src];
fsr->fsr_source = src;
fsr->fsr_name = strdup(name);
fsr->fsr_prio.fsp_class = prio;
fsr->fsr_prio.fsp_slot = slot;
fsr->fsr_behaviour = bh;
}
fib_source_t
fib_source_allocate (const char *name,
fib_source_priority_t prio,
fib_source_behaviour_t bh)
{
fib_source_t src;
// max value range
ASSERT(fib_source_id < 255);
if (fib_source_id == 255)
return (FIB_SOURCE_INVALID);
src = fib_source_id++;
fib_source_reg_init(src, name, prio, bh);
return (src);
}
void
fib_source_register (fib_source_t src,
fib_source_priority_t prio,
fib_source_behaviour_t bh)
{
fib_source_reg_init(src, fib_source_names[src], prio, bh);
}
static u8 *
format_fib_source_reg (u8 *s, va_list *a)
{
fib_source_reg_t *fsr = va_arg(*a, fib_source_reg_t*);
s = format(s, "[%d] %U prio:%d.%d behaviour:%s",
fsr->fsr_source,
format_fib_source, fsr->fsr_source,
fsr->fsr_prio.fsp_class, fsr->fsr_prio.fsp_slot,
fib_source_behaviour_names[fsr->fsr_behaviour]);
return (s);
}
static int
fib_source_reg_cmp_for_sort (void * v1,
void * v2)
{
fib_source_reg_t *fsr1 = v1, *fsr2 = v2;
return (fib_source_get_prio(fsr1->fsr_source) -
fib_source_get_prio(fsr2->fsr_source));
}
void
fib_source_walk (fib_source_walk_t fn,
void *ctx)
{
fib_source_reg_t *fsr;
vec_foreach(fsr, fib_source_regs)
{
if (WALK_STOP == fn(fsr->fsr_source,
fsr->fsr_name,
fsr->fsr_prio.fsp_class,
fsr->fsr_behaviour,
ctx))
break;
}
}
static clib_error_t *
fib_source_show (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
fib_source_reg_t *fsr, *fsrs;
fsrs = vec_dup(fib_source_regs);
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "prio") ||
unformat (input, "priority"))
vec_sort_with_function(fsrs, fib_source_reg_cmp_for_sort);
}
vec_foreach(fsr, fsrs)
{
vlib_cli_output(vm, "%U", format_fib_source_reg, fsr);
}
vec_free(fsrs);
return (NULL);
}
VLIB_CLI_COMMAND (show_fib_sources, static) = {
.path = "show fib source",
.function = fib_source_show,
.short_help = "show fib source [prio]",
};
void
fib_source_module_init (void)
{
#define _(s,p,b) fib_source_register(s,p,b);
foreach_fib_source
#undef _
}
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