2 *------------------------------------------------------------------
3 * Copyright (c) 2016 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 #include <sys/types.h>
21 #include <linux/virtio_net.h>
22 #include <linux/vhost.h>
24 #include <vlib/vlib.h>
25 #include <vlib/unix/unix.h>
26 #include <vnet/ethernet/ethernet.h>
27 #include <vnet/ip/ip4_packet.h>
28 #include <vnet/ip/ip6_packet.h>
29 #include <vnet/devices/virtio/virtio.h>
31 #define foreach_virtio_tx_func_error \
32 _(NO_FREE_SLOTS, "no free tx slots") \
33 _(TRUNC_PACKET, "packet > buffer size -- truncated in tx ring") \
34 _(PENDING_MSGS, "pending msgs in tx ring") \
35 _(NO_TX_QUEUES, "no tx queues")
39 #define _(f,s) TAP_TX_ERROR_##f,
40 foreach_virtio_tx_func_error
43 } virtio_tx_func_error_t;
45 static char *virtio_tx_func_error_strings[] = {
47 foreach_virtio_tx_func_error
52 format_virtio_device_name (u8 * s, va_list * args)
54 u32 dev_instance = va_arg (*args, u32);
55 virtio_main_t *mm = &virtio_main;
56 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, dev_instance);
58 if (vif->type == VIRTIO_IF_TYPE_TAP)
60 s = format (s, "tap%u", vif->id);
63 s = format (s, "virtio%lu", vif->dev_instance);
69 format_virtio_device (u8 * s, va_list * args)
71 u32 dev_instance = va_arg (*args, u32);
72 int verbose = va_arg (*args, int);
73 u32 indent = format_get_indent (s);
75 s = format (s, "VIRTIO interface");
78 s = format (s, "\n%U instance %u", format_white_space, indent + 2,
85 format_virtio_tx_trace (u8 * s, va_list * args)
87 s = format (s, "Unimplemented...");
92 virtio_free_used_desc (vlib_main_t * vm, virtio_vring_t * vring)
94 u16 used = vring->desc_in_use;
97 u16 last = vring->last_used_idx;
98 u16 n_left = vring->used->idx - last;
105 struct vring_used_elem *e = &vring->used->ring[last & mask];
107 struct vring_desc *d = &vring->desc[slot];
109 if (PREDICT_FALSE (d->flags & VRING_DESC_F_INDIRECT))
111 d = uword_to_pointer (d->addr, struct vring_desc *);
115 vlib_buffer_free (vm, &vring->buffers[slot], 1);
120 vring->desc_in_use = used;
121 vring->last_used_idx = last;
124 static_always_inline u16
125 add_buffer_to_slot (vlib_main_t * vm, virtio_vring_t * vring, u32 bi,
126 u16 avail, u16 next, u16 mask)
129 const int hdr_sz = sizeof (struct virtio_net_hdr_v1);
130 struct vring_desc *d;
131 d = &vring->desc[next];
132 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
134 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
136 d->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
137 d->len = b->current_length + hdr_sz;
142 struct vring_desc *id, *descs = 0;
144 /* first buffer in chain */
145 vec_add2_aligned (descs, id, 1, CLIB_CACHE_LINE_BYTES);
146 id->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
147 id->len = b->current_length + hdr_sz;
149 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
151 id->flags = VRING_DESC_F_NEXT;
152 id->next = vec_len (descs);
153 vec_add2_aligned (descs, id, 1, CLIB_CACHE_LINE_BYTES);
154 b = vlib_get_buffer (vm, b->next_buffer);
155 id->addr = pointer_to_uword (vlib_buffer_get_current (b));
156 id->len = b->current_length;
159 d->addr = pointer_to_uword (descs);
160 d->len = vec_len (descs) * sizeof (struct vring_desc);
161 d->flags = VRING_DESC_F_INDIRECT;
163 vring->buffers[next] = bi;
164 vring->avail->ring[avail & mask] = next;
170 static_always_inline uword
171 virtio_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
172 vlib_frame_t * frame, virtio_if_t * vif)
175 u16 n_left = frame->n_vectors;
176 virtio_vring_t *vring = vec_elt_at_index (vif->vrings, (qid << 1) + 1);
177 u16 used, next, avail;
178 u16 sz = vring->size;
180 u32 *buffers = vlib_frame_args (frame);
182 /* free consumed buffers */
183 virtio_free_used_desc (vm, vring);
185 used = vring->desc_in_use;
186 next = vring->desc_next;
187 avail = vring->avail->idx;
189 while (n_left && used < sz)
192 n_added = add_buffer_to_slot (vm, vring, buffers[0], avail, next, mask);
194 next = (next + n_added) & mask;
200 if (n_left != frame->n_vectors)
202 CLIB_MEMORY_STORE_BARRIER ();
203 vring->avail->idx = avail;
204 vring->desc_next = next;
205 vring->desc_in_use = used;
206 if ((vring->used->flags & VIRTIO_RING_FLAG_MASK_INT) == 0)
209 CLIB_UNUSED (int r) = write (vring->kick_fd, &x, sizeof (x));
216 vlib_error_count (vm, node->node_index, TAP_TX_ERROR_NO_FREE_SLOTS,
218 vlib_buffer_free (vm, buffers, n_left);
221 return frame->n_vectors - n_left;
225 virtio_interface_tx (vlib_main_t * vm,
226 vlib_node_runtime_t * node, vlib_frame_t * frame)
228 virtio_main_t *nm = &virtio_main;
229 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
230 virtio_if_t *vif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
232 return virtio_interface_tx_inline (vm, node, frame, vif);
236 virtio_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
239 virtio_main_t *apm = &virtio_main;
240 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
241 virtio_if_t *vif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
243 /* Shut off redirection */
244 if (node_index == ~0)
246 vif->per_interface_next_index = node_index;
250 vif->per_interface_next_index =
251 vlib_node_add_next (vlib_get_main (), virtio_input_node.index,
256 virtio_clear_hw_interface_counters (u32 instance)
258 /* Nothing for now */
261 static clib_error_t *
262 virtio_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
263 vnet_hw_interface_rx_mode mode)
265 virtio_main_t *mm = &virtio_main;
266 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
267 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
268 virtio_vring_t *vring = vec_elt_at_index (vif->vrings, qid);
270 if (mode == VNET_HW_INTERFACE_RX_MODE_POLLING)
271 vring->avail->flags |= VIRTIO_RING_FLAG_MASK_INT;
273 vring->avail->flags &= ~VIRTIO_RING_FLAG_MASK_INT;
278 static clib_error_t *
279 virtio_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
281 virtio_main_t *mm = &virtio_main;
282 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
283 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
284 static clib_error_t *error = 0;
286 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
287 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
289 vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP;
295 static clib_error_t *
296 virtio_subif_add_del_function (vnet_main_t * vnm,
298 struct vnet_sw_interface_t *st, int is_add)
300 /* Nothing for now */
305 VNET_DEVICE_CLASS (virtio_device_class) = {
307 .tx_function = virtio_interface_tx,
308 .format_device_name = format_virtio_device_name,
309 .format_device = format_virtio_device,
310 .format_tx_trace = format_virtio_tx_trace,
311 .tx_function_n_errors = TAP_TX_N_ERROR,
312 .tx_function_error_strings = virtio_tx_func_error_strings,
313 .rx_redirect_to_node = virtio_set_interface_next_node,
314 .clear_counters = virtio_clear_hw_interface_counters,
315 .admin_up_down_function = virtio_interface_admin_up_down,
316 .subif_add_del_function = virtio_subif_add_del_function,
317 .rx_mode_change_function = virtio_interface_rx_mode_change,
320 VLIB_DEVICE_TX_FUNCTION_MULTIARCH(virtio_device_class,
325 * fd.io coding-style-patch-verification: ON
328 * eval: (c-set-style "gnu")