2 *------------------------------------------------------------------
3 * Copyright (c) 2020 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *------------------------------------------------------------------
18 #ifndef _VNET_DEVICES_VIRTIO_VIRTIO_BUFFERING_H_
19 #define _VNET_DEVICES_VIRTIO_VIRTIO_BUFFERING_H_
21 #include <vnet/interface.h>
23 #define VIRTIO_BUFFERING_DEFAULT_SIZE 1024
24 #define VIRTIO_BUFFERING_TIMEOUT 1e-5
36 } virtio_vring_buffering_t;
38 static_always_inline clib_error_t *
39 virtio_vring_buffering_init (virtio_vring_buffering_t ** buffering,
40 u32 node_index, u16 size)
43 return clib_error_return (0, "buffering: already initialized");
46 return clib_error_return (0, "buffering: size must be power of 2");
49 return clib_error_return (0, "buffering: size must be 32768 or lower");
52 size = VIRTIO_BUFFERING_DEFAULT_SIZE;
54 virtio_vring_buffering_t *b_temp = 0;
56 (virtio_vring_buffering_t *)
57 clib_mem_alloc (sizeof (virtio_vring_buffering_t));
59 return clib_error_return (0, "buffering: memory allocation failed");
61 clib_memset (b_temp, 0, sizeof (virtio_vring_buffering_t));
63 b_temp->node_index = node_index;
64 b_temp->free_size = size;
67 vec_validate_aligned (b_temp->buffers, size, CLIB_CACHE_LINE_BYTES);
68 b_temp->is_enable = 1;
74 static_always_inline void
75 virtio_vring_buffering_buffers_free (vlib_main_t * vm,
76 virtio_vring_buffering_t * buffering)
78 u16 n_buffers = buffering->size - buffering->free_size;
81 vlib_buffer_free_from_ring (vm, buffering->buffers, buffering->front,
82 buffering->size, n_buffers);
83 buffering->free_size += n_buffers;
87 static_always_inline void
88 virtio_vring_buffering_free (vlib_main_t * vm,
89 virtio_vring_buffering_t * buffering)
93 virtio_vring_buffering_buffers_free (vm, buffering);
94 vec_free (buffering->buffers);
95 clib_mem_free (buffering);
99 static_always_inline u8
100 virtio_vring_buffering_is_enable (virtio_vring_buffering_t * buffering)
103 return buffering->is_enable;
108 static_always_inline void
109 virtio_vring_buffering_set_is_enable (virtio_vring_buffering_t * buffering,
113 buffering->is_enable = is_enable;
116 static_always_inline void
117 virtio_vring_buffering_set_timeout (vlib_main_t * vm,
118 virtio_vring_buffering_t * buffering,
122 buffering->timeout_ts = vlib_time_now (vm) + timeout_expire;
125 static_always_inline u8
126 virtio_vring_buffering_is_timeout (vlib_main_t * vm,
127 virtio_vring_buffering_t * buffering)
129 if (buffering && (buffering->timeout_ts < vlib_time_now (vm)))
134 static_always_inline u8
135 virtio_vring_buffering_is_empty (virtio_vring_buffering_t * buffering)
137 if (buffering->size == buffering->free_size)
142 static_always_inline u8
143 virtio_vring_buffering_is_full (virtio_vring_buffering_t * buffering)
145 if (buffering->free_size == 0)
150 static_always_inline u16
151 virtio_vring_n_buffers (virtio_vring_buffering_t * buffering)
153 return (buffering->size - buffering->free_size);
156 static_always_inline u16
157 virtio_vring_buffering_store_packets (virtio_vring_buffering_t * buffering,
158 u32 * bi, u16 n_store)
160 u16 mask, n_s = 0, i = 0;
162 if (!virtio_vring_buffering_is_enable (buffering)
163 || virtio_vring_buffering_is_full (buffering))
166 mask = buffering->size - 1;
167 n_s = clib_min (n_store, buffering->free_size);
171 buffering->buffers[buffering->back] = bi[i];
172 buffering->back = (buffering->back + 1) & mask;
173 buffering->free_size--;
179 static_always_inline u32
180 virtio_vring_buffering_read_from_front (virtio_vring_buffering_t * buffering)
183 u16 mask = buffering->size - 1;
184 if (virtio_vring_buffering_is_empty (buffering))
187 bi = buffering->buffers[buffering->front];
188 buffering->buffers[buffering->front] = ~0;
189 buffering->front = (buffering->front + 1) & mask;
190 buffering->free_size++;
194 static_always_inline u32
195 virtio_vring_buffering_read_from_back (virtio_vring_buffering_t * buffering)
198 u16 mask = buffering->size - 1;
199 if (virtio_vring_buffering_is_empty (buffering))
202 buffering->back = (buffering->back - 1) & mask;
203 bi = buffering->buffers[buffering->back];
204 buffering->buffers[buffering->back] = ~0;
205 buffering->free_size++;
209 static_always_inline void
210 virtio_vring_buffering_schedule_node_on_dispatcher (
211 vlib_main_t *vm, vnet_hw_if_tx_queue_t *txq,
212 virtio_vring_buffering_t *buffering)
214 if (buffering && virtio_vring_buffering_is_timeout (vm, buffering)
215 && virtio_vring_n_buffers (buffering))
217 vlib_frame_t *f = vlib_get_frame_to_node (vm, buffering->node_index);
218 vnet_hw_if_tx_frame_t *ft = vlib_frame_scalar_args (f);
219 u32 *f_to = vlib_frame_vector_args (f);
220 ft->shared_queue = txq->shared_queue;
221 ft->queue_id = txq->queue_id;
222 f_to[f->n_vectors] = virtio_vring_buffering_read_from_back (buffering);
224 vlib_put_frame_to_node (vm, buffering->node_index, f);
225 virtio_vring_buffering_set_timeout (vm, buffering,
226 VIRTIO_BUFFERING_TIMEOUT);
230 static_always_inline u8 *
231 virtio_vring_buffering_format (u8 * s, va_list * args)
233 virtio_vring_buffering_t *buffering =
234 va_arg (*args, virtio_vring_buffering_t *);
235 u32 indent = format_get_indent (s);
242 if (buffering->is_enable)
243 s = format (s, "packet-buffering: enable\n");
245 s = format (s, "packet-buffering: disable\n");
248 "%Usize %u n_buffers %u front %u back %u",
249 format_white_space, indent, buffering->size,
250 virtio_vring_n_buffers (buffering), buffering->front,
256 #endif /* _VNET_DEVICES_VIRTIO_VIRTIO_BUFFERING_H_ */
259 * fd.io coding-style-patch-verification: ON
262 * eval: (c-set-style "gnu")