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) VIRTIO_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)
59 s = format (s, "tap%u", vif->id);
60 else if (vif->type == VIRTIO_IF_TYPE_PCI)
61 s = format (s, "virtio-%x/%x/%x/%x", vif->pci_addr.domain,
62 vif->pci_addr.bus, vif->pci_addr.slot,
63 vif->pci_addr.function);
65 s = format (s, "virtio-%lu", vif->dev_instance);
71 format_virtio_device (u8 * s, va_list * args)
73 u32 dev_instance = va_arg (*args, u32);
74 int verbose = va_arg (*args, int);
75 u32 indent = format_get_indent (s);
77 s = format (s, "VIRTIO interface");
80 s = format (s, "\n%U instance %u", format_white_space, indent + 2,
87 format_virtio_tx_trace (u8 * s, va_list * args)
89 s = format (s, "Unimplemented...");
94 virtio_free_used_desc (vlib_main_t * vm, virtio_vring_t * vring)
96 u16 used = vring->desc_in_use;
99 u16 last = vring->last_used_idx;
100 u16 n_left = vring->used->idx - last;
107 struct vring_used_elem *e = &vring->used->ring[last & mask];
110 vlib_buffer_free (vm, &vring->buffers[slot], 1);
115 vring->desc_in_use = used;
116 vring->last_used_idx = last;
119 static_always_inline u16
120 add_buffer_to_slot (vlib_main_t * vm, virtio_if_t * vif,
121 virtio_vring_t * vring, u32 bi, u16 avail, u16 next,
125 int hdr_sz = vif->virtio_net_hdr_sz;
126 struct vring_desc *d;
127 d = &vring->desc[next];
128 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
129 struct virtio_net_hdr_v1 *hdr = vlib_buffer_get_current (b) - hdr_sz;
131 clib_memset (hdr, 0, hdr_sz);
133 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
136 ((vif->type == VIRTIO_IF_TYPE_PCI) ? vlib_buffer_get_current_pa (vm,
138 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
139 d->len = b->current_length + hdr_sz;
145 * We are using single vlib_buffer_t for indirect descriptor(s)
146 * chain. Single descriptor is 16 bytes and vlib_buffer_t
147 * has 2048 bytes space. So maximum long chain can have 128
148 * (=2048/16) indirect descriptors.
149 * It can easily support 65535 bytes of Jumbo frames with
150 * each data buffer size of 512 bytes minimum.
152 vlib_buffer_t *indirect_desc =
153 vlib_get_buffer (vm, vring->indirect_buffers[next]);
154 indirect_desc->current_data = 0;
156 struct vring_desc *id =
157 (struct vring_desc *) vlib_buffer_get_current (indirect_desc);
159 if (vif->type == VIRTIO_IF_TYPE_PCI)
161 d->addr = vlib_physmem_get_pa (vm, id);
162 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
165 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
166 * should be presented in separate descriptor and data will start
167 * from next descriptor.
170 (vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)))
171 id->len = b->current_length + hdr_sz;
175 id->flags = VRING_DESC_F_NEXT;
179 id->addr = vlib_buffer_get_current_pa (vm, b);
180 id->len = b->current_length;
182 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
184 id->flags = VRING_DESC_F_NEXT;
188 b = vlib_get_buffer (vm, b->next_buffer);
189 id->addr = vlib_buffer_get_current_pa (vm, b);
190 id->len = b->current_length;
193 else /* VIRTIO_IF_TYPE_TAP */
195 d->addr = pointer_to_uword (id);
196 /* first buffer in chain */
197 id->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
198 id->len = b->current_length + hdr_sz;
200 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
202 id->flags = VRING_DESC_F_NEXT;
206 b = vlib_get_buffer (vm, b->next_buffer);
207 id->addr = pointer_to_uword (vlib_buffer_get_current (b));
208 id->len = b->current_length;
213 d->len = count * sizeof (struct vring_desc);
214 d->flags = VRING_DESC_F_INDIRECT;
216 vring->buffers[next] = bi;
217 vring->avail->ring[avail & mask] = next;
222 static_always_inline uword
223 virtio_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
224 vlib_frame_t * frame, virtio_if_t * vif)
227 u16 n_left = frame->n_vectors;
228 virtio_vring_t *vring = vec_elt_at_index (vif->vrings, (qid << 1) + 1);
229 u16 used, next, avail;
230 u16 sz = vring->size;
232 u32 *buffers = vlib_frame_vector_args (frame);
234 clib_spinlock_lock_if_init (&vif->lockp);
236 if ((vring->used->flags & VIRTIO_RING_FLAG_MASK_INT) == 0 &&
237 (vring->last_kick_avail_idx != vring->avail->idx))
238 virtio_kick (vm, vring, vif);
240 /* free consumed buffers */
241 virtio_free_used_desc (vm, vring);
243 used = vring->desc_in_use;
244 next = vring->desc_next;
245 avail = vring->avail->idx;
247 while (n_left && used < sz)
251 add_buffer_to_slot (vm, vif, vring, buffers[0], avail, next, mask);
255 next = (next + n_added) & mask;
261 if (n_left != frame->n_vectors)
263 CLIB_MEMORY_STORE_BARRIER ();
264 vring->avail->idx = avail;
265 vring->desc_next = next;
266 vring->desc_in_use = used;
267 if ((vring->used->flags & VIRTIO_RING_FLAG_MASK_INT) == 0)
268 virtio_kick (vm, vring, vif);
273 vlib_error_count (vm, node->node_index, VIRTIO_TX_ERROR_NO_FREE_SLOTS,
275 vlib_buffer_free (vm, buffers, n_left);
278 clib_spinlock_unlock_if_init (&vif->lockp);
280 return frame->n_vectors - n_left;
284 virtio_interface_tx (vlib_main_t * vm,
285 vlib_node_runtime_t * node, vlib_frame_t * frame)
287 virtio_main_t *nm = &virtio_main;
288 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
289 virtio_if_t *vif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
291 return virtio_interface_tx_inline (vm, node, frame, vif);
295 virtio_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
298 virtio_main_t *apm = &virtio_main;
299 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
300 virtio_if_t *vif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
302 /* Shut off redirection */
303 if (node_index == ~0)
305 vif->per_interface_next_index = node_index;
309 vif->per_interface_next_index =
310 vlib_node_add_next (vlib_get_main (), virtio_input_node.index,
315 virtio_clear_hw_interface_counters (u32 instance)
317 /* Nothing for now */
320 static clib_error_t *
321 virtio_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
322 vnet_hw_interface_rx_mode mode)
324 virtio_main_t *mm = &virtio_main;
325 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
326 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
327 virtio_vring_t *vring = vec_elt_at_index (vif->vrings, qid);
329 if (mode == VNET_HW_INTERFACE_RX_MODE_POLLING)
330 vring->avail->flags |= VIRTIO_RING_FLAG_MASK_INT;
332 vring->avail->flags &= ~VIRTIO_RING_FLAG_MASK_INT;
337 static clib_error_t *
338 virtio_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
340 virtio_main_t *mm = &virtio_main;
341 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
342 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
344 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
345 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
347 vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP;
352 static clib_error_t *
353 virtio_subif_add_del_function (vnet_main_t * vnm,
355 struct vnet_sw_interface_t *st, int is_add)
357 /* Nothing for now */
362 VNET_DEVICE_CLASS (virtio_device_class) = {
364 .tx_function = virtio_interface_tx,
365 .format_device_name = format_virtio_device_name,
366 .format_device = format_virtio_device,
367 .format_tx_trace = format_virtio_tx_trace,
368 .tx_function_n_errors = VIRTIO_TX_N_ERROR,
369 .tx_function_error_strings = virtio_tx_func_error_strings,
370 .rx_redirect_to_node = virtio_set_interface_next_node,
371 .clear_counters = virtio_clear_hw_interface_counters,
372 .admin_up_down_function = virtio_interface_admin_up_down,
373 .subif_add_del_function = virtio_subif_add_del_function,
374 .rx_mode_change_function = virtio_interface_rx_mode_change,
377 VLIB_DEVICE_TX_FUNCTION_MULTIARCH(virtio_device_class,
382 * fd.io coding-style-patch-verification: ON
385 * eval: (c-set-style "gnu")