from vpp_interface import VppInterface
class VppTAPInterface(VppInterface):
@property
def tap_id(self):
"""TAP id"""
return self._tap_id
def __init__(self, test, tap_id=0xffffffff, mac_addr=None):
self._test = test
self._tap_id = tap_id
self._mac_addr =
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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/vnet.h>
#include <vppinfra/xxhash.h>
#include <vlib/threads.h>
#include <vnet/handoff.h>
#include <vnet/feature/feature.h>
typedef struct
{
uword *workers_bitmap;
u32 *workers;
} per_inteface_handoff_data_t;
typedef struct
{
u32 cached_next_index;
u32 num_workers;
u32 first_worker_index;
per_inteface_handoff_data_t *if_data;
/* Worker handoff index */
u32 frame_queue_index;
u64 (*hash_fn) (ethernet_header_t *);
} handoff_main_t;
extern handoff_main_t handoff_main;
#ifndef CLIB_MARCH_VARIANT
handoff_main_t handoff_main;
#endif /* CLIB_MARCH_VARIANT */
typedef struct
{
u32 sw_if_index;
u32 next_worker_index;
u32 buffer_index;
} worker_handoff_trace_t;
#define foreach_worker_handoff_error \
_(CONGESTION_DROP, "congestion drop")
typedef enum
{
#define _(sym,str) WORKER_HANDOFF_ERROR_##sym,
foreach_worker_handoff_error
#undef _
WORKER_HANDOFF_N_ERROR,
} worker_handoff_error_t;
static char *worker_handoff_error_strings[] = {
#define _(sym,string) string,
foreach_worker_handoff_error
#undef _
};
/* packet trace format function */
static u8 *
format_worker_handoff_trace (u8 * s, va_list * args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
worker_handoff_trace_t *t = va_arg (*args, worker_handoff_trace_t *);
s =
format (s, "worker-handoff: sw_if_index %d, next_worker %d, buffer 0x%x",
t->sw_if_index, t->next_worker_index, t->buffer_index);
return s;
}
VLIB_NODE_FN (worker_handoff_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
handoff_main_t *hm = &handoff_main;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
u32 n_enq, n_left_from, *from;
u16 thread_indices[VLIB_FRAME_SIZE], *ti;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
vlib_get_buffers (vm, from, bufs, n_left_from);
b = bufs;
ti = thread_indices;
while (n_left_from > 0)
{
u32 sw_if_index0;
u32 hash;
u64 hash_key;
per_inteface_handoff_data_t *ihd0;
u32 index0;
sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
ASSERT (hm->if_data);
ihd0 = vec_elt_at_index (hm->if_data, sw_if_index0);
/*
* Force unknown traffic onto worker 0,
* and into ethernet-input. $$$$ add more hashes.
*/
/* Compute ingress LB hash */
hash_key = hm->hash_fn ((ethernet_header_t *)
vlib_buffer_get_current (b[0]));
hash = (u32) clib_xxhash (hash_key);
/* if input node did not specify next index, then packet
should go to ethernet-input */
if (PREDICT_TRUE (is_pow2 (vec_len (ihd0->workers))))
index0 = hash & (vec_len (ihd0->workers) - 1);
else
index0 = hash % vec_len (ihd0->workers);
ti[0] = hm->first_worker_index + ihd0->workers[index0];
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
{
worker_handoff_trace_t *t =
vlib_add_trace (vm, node, b[0], sizeof (*t));
t->sw_if_index = sw_if_index0;
t->next_worker_index = ti[0];
t->buffer_index = vlib_get_buffer_index (vm, b[0]);
}
/* next */
n_left_from -= 1;
ti += 1;
b += 1;
}
n_enq = vlib_buffer_enqueue_to_thread (vm, hm->frame_queue_index, from,
thread_indices, frame->n_vectors, 1);
if (n_enq < frame->n_vectors)
vlib_node_increment_counter (vm, node->node_index,
WORKER_HANDOFF_ERROR_CONGESTION_DROP,
frame->n_vectors - n_enq);
return frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (worker_handoff_node) = {
.name = "worker-handoff",
.vector_size = sizeof (u32),
.format_trace = format_worker_handoff_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(worker_handoff_error_strings),
.error_strings = worker_handoff_error_strings,
.n_next_nodes = 1,
.next_nodes = {
[0] = "error-drop",
},
};
/* *INDENT-ON* */
#ifndef CLIB_MARCH_VARIANT
int
interface_handoff_enable_disable (vlib_main_t * vm, u32 sw_if_index,
uword * bitmap, int enable_disable)
{
handoff_main_t *hm = &handoff_main;
vnet_sw_interface_t *sw;
vnet_main_t *vnm = vnet_get_main ();
per_inteface_handoff_data_t *d;
int i, rv = 0;
if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index))
return VNET_API_ERROR_INVALID_SW_IF_INDEX;
sw = vnet_get_sw_interface (vnm, sw_if_index);
if (sw->type != VNET_SW_INTERFACE_TYPE_HARDWARE)
return VNET_API_ERROR_INVALID_SW_IF_INDEX;
if (clib_bitmap_last_set (bitmap) >= hm->num_workers)
return VNET_API_ERROR_INVALID_WORKER;
if (hm->frame_queue_index == ~0)
{
vlib_node_t *n = vlib_get_node_by_name (vm, (u8 *) "ethernet-input");
hm->frame_queue_index = vlib_frame_queue_main_init (n->index, 0);
}
vec_validate (hm->if_data, sw_if_index);
d = vec_elt_at_index (hm->if_data, sw_if_index);
vec_free (d->workers);
vec_free (d->workers_bitmap);
if (enable_disable)
{
d->workers_bitmap = bitmap;
/* *INDENT-OFF* */
clib_bitmap_foreach (i, bitmap,
({
vec_add1(d->workers, i);
}));
/* *INDENT-ON* */
}
vnet_feature_enable_disable ("device-input", "worker-handoff",
sw_if_index, enable_disable, 0, 0);
return rv;
}
static clib_error_t *
set_interface_handoff_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
handoff_main_t *hm = &handoff_main;
u32 sw_if_index = ~0;
int enable_disable = 1;
uword *bitmap = 0;
u32 sym = ~0;
int rv = 0;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "disable"))
enable_disable = 0;
else if (unformat (input, "workers %U", unformat_bitmap_list, &bitmap))
;
else if (unformat (input, "%U", unformat_vnet_sw_interface,
vnet_get_main (), &sw_if_index))
;
else if (unformat (input, "symmetrical"))
sym = 1;
else if (unformat (input, "asymmetrical"))
sym = 0;
else
break;
}
if (sw_if_index == ~0)
return clib_error_return (0, "Please specify an interface...");
if (bitmap == 0)
return clib_error_return (0, "Please specify list of workers...");
rv =
interface_handoff_enable_disable (vm, sw_if_index, bitmap,
enable_disable);
switch (rv)
{
case 0:
break;
case VNET_API_ERROR_INVALID_SW_IF_INDEX:
return clib_error_return (0, "Invalid interface");
break;
case VNET_API_ERROR_INVALID_WORKER:
return clib_error_return (0, "Invalid worker(s)");
break;
case VNET_API_ERROR_UNIMPLEMENTED:
return clib_error_return (0,
"Device driver doesn't support redirection");
break;
default:
return clib_error_return (0, "unknown return value %d", rv);
}
if (sym == 1)
hm->hash_fn = eth_get_sym_key;
else if (sym == 0)
hm->hash_fn = eth_get_key;
return 0;
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (set_interface_handoff_command, static) = {
.path = "set interface handoff",
.short_help =
"set interface handoff <interface-name> workers <workers-list> [symmetrical|asymmetrical]",
.function = set_interface_handoff_command_fn,
};
/* *INDENT-ON* */
clib_error_t *
handoff_init (vlib_main_t * vm)
{
handoff_main_t *hm = &handoff_main;
vlib_thread_main_t *tm = vlib_get_thread_main ();
clib_error_t *error;
uword *p;
if ((error = vlib_call_init_function (vm, threads_init)))
return error;
vlib_thread_registration_t *tr;
/* Only the standard vnet worker threads are supported */
p = hash_get_mem (tm->thread_registrations_by_name, "workers");
if (p)
{
tr = (vlib_thread_registration_t *) p[0];
if (tr)
{
hm->num_workers = tr->count;
hm->first_worker_index = tr->first_index;
}
}
hm->hash_fn = eth_get_key;
hm->frame_queue_index = ~0;
return 0;
}
VLIB_INIT_FUNCTION (handoff_init);
#endif /* CLIB_MARCH_VARIANT */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
