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>
22 #include <vlib/vlib.h>
23 #include <vlib/unix/unix.h>
24 #include <vnet/ethernet/ethernet.h>
25 #include <vnet/ip/ip4_packet.h>
26 #include <vnet/ip/ip6_packet.h>
27 #include <vnet/devices/virtio/virtio.h>
29 #define foreach_virtio_tx_func_error \
30 _(NO_FREE_SLOTS, "no free tx slots") \
31 _(TRUNC_PACKET, "packet > buffer size -- truncated in tx ring") \
32 _(PENDING_MSGS, "pending msgs in tx ring") \
33 _(NO_TX_QUEUES, "no tx queues")
37 #define _(f,s) VIRTIO_TX_ERROR_##f,
38 foreach_virtio_tx_func_error
41 } virtio_tx_func_error_t;
43 static char *virtio_tx_func_error_strings[] = {
45 foreach_virtio_tx_func_error
50 format_virtio_device (u8 * s, va_list * args)
52 u32 dev_instance = va_arg (*args, u32);
53 int verbose = va_arg (*args, int);
54 u32 indent = format_get_indent (s);
56 s = format (s, "VIRTIO interface");
59 s = format (s, "\n%U instance %u", format_white_space, indent + 2,
66 format_virtio_tx_trace (u8 * s, va_list * args)
68 s = format (s, "Unimplemented...");
72 static_always_inline void
73 virtio_free_used_device_desc (vlib_main_t * vm, virtio_vring_t * vring)
75 u16 used = vring->desc_in_use;
78 u16 last = vring->last_used_idx;
79 u16 n_left = vring->used->idx - last;
86 struct vring_used_elem *e = &vring->used->ring[last & mask];
88 slot = n_buffers = e->id;
90 while (e->id == n_buffers)
97 e = &vring->used->ring[last & mask];
99 vlib_buffer_free_from_ring (vm, vring->buffers, slot,
100 sz, (n_buffers - slot));
101 used -= (n_buffers - slot);
107 vlib_buffer_free (vm, &vring->buffers[slot], 1);
113 vring->desc_in_use = used;
114 vring->last_used_idx = last;
117 static_always_inline u16
118 add_buffer_to_slot (vlib_main_t * vm, virtio_if_t * vif,
119 virtio_vring_t * vring, u32 bi, u16 avail, u16 next,
120 u16 mask, int do_gso)
123 int hdr_sz = vif->virtio_net_hdr_sz;
124 struct vring_desc *d;
125 d = &vring->desc[next];
126 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
127 struct virtio_net_hdr_v1 *hdr = vlib_buffer_get_current (b) - hdr_sz;
129 clib_memset (hdr, 0, hdr_sz);
130 if (do_gso && (b->flags & VNET_BUFFER_F_GSO))
132 if (b->flags & VNET_BUFFER_F_IS_IP4)
134 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
135 hdr->gso_size = vnet_buffer2 (b)->gso_size;
136 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
137 hdr->csum_start = vnet_buffer (b)->l4_hdr_offset; // 0x22;
138 hdr->csum_offset = 0x10;
142 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
143 hdr->gso_size = vnet_buffer2 (b)->gso_size;
144 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
145 hdr->csum_start = vnet_buffer (b)->l4_hdr_offset; // 0x36;
146 hdr->csum_offset = 0x10;
150 if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
153 ((vif->type == VIRTIO_IF_TYPE_PCI) ? vlib_buffer_get_current_pa (vm,
155 pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
156 d->len = b->current_length + hdr_sz;
162 * We are using single vlib_buffer_t for indirect descriptor(s)
163 * chain. Single descriptor is 16 bytes and vlib_buffer_t
164 * has 2048 bytes space. So maximum long chain can have 128
165 * (=2048/16) indirect descriptors.
166 * It can easily support 65535 bytes of Jumbo frames with
167 * each data buffer size of 512 bytes minimum.
169 u32 indirect_buffer = 0;
170 if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
173 vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
174 indirect_desc->current_data = 0;
175 indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
176 indirect_desc->next_buffer = bi;
177 bi = indirect_buffer;
179 struct vring_desc *id =
180 (struct vring_desc *) vlib_buffer_get_current (indirect_desc);
182 if (vif->type == VIRTIO_IF_TYPE_PCI)
184 d->addr = vlib_physmem_get_pa (vm, id);
185 id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
188 * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
189 * should be presented in separate descriptor and data will start
190 * from next descriptor.
193 (vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)))
194 id->len = b->current_length + hdr_sz;
198 id->flags = VRING_DESC_F_NEXT;
202 id->addr = vlib_buffer_get_current_pa (vm, b);
203 id->len = b->current_length;
205 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
207 id->flags = VRING_DESC_F_NEXT;
211 b = vlib_get_buffer (vm, b->next_buffer);
212 id->addr = vlib_buffer_get_current_pa (vm, b);
213 id->len = b->current_length;
216 else /* VIRTIO_IF_TYPE_TAP */
218 d->addr = pointer_to_uword (id);
219 /* first buffer in chain */
220 id->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
221 id->len = b->current_length + hdr_sz;
223 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
225 id->flags = VRING_DESC_F_NEXT;
229 b = vlib_get_buffer (vm, b->next_buffer);
230 id->addr = pointer_to_uword (vlib_buffer_get_current (b));
231 id->len = b->current_length;
236 d->len = count * sizeof (struct vring_desc);
237 d->flags = VRING_DESC_F_INDIRECT;
239 vring->buffers[next] = bi;
240 vring->avail->ring[avail & mask] = next;
245 static_always_inline uword
246 virtio_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
247 vlib_frame_t * frame, virtio_if_t * vif,
250 u16 n_left = frame->n_vectors;
251 virtio_vring_t *vring;
252 u16 qid = vm->thread_index % vif->num_txqs;
253 vring = vec_elt_at_index (vif->txq_vrings, qid);
254 u16 used, next, avail;
255 u16 sz = vring->size;
257 u32 *buffers = vlib_frame_vector_args (frame);
259 clib_spinlock_lock_if_init (&vring->lockp);
261 if ((vring->used->flags & VIRTIO_RING_FLAG_MASK_INT) == 0 &&
262 (vring->last_kick_avail_idx != vring->avail->idx))
263 virtio_kick (vm, vring, vif);
265 /* free consumed buffers */
266 virtio_free_used_device_desc (vm, vring);
268 used = vring->desc_in_use;
269 next = vring->desc_next;
270 avail = vring->avail->idx;
272 while (n_left && used < sz)
276 add_buffer_to_slot (vm, vif, vring, buffers[0], avail, next, mask,
281 next = (next + n_added) & mask;
287 if (n_left != frame->n_vectors)
289 CLIB_MEMORY_STORE_BARRIER ();
290 vring->avail->idx = avail;
291 vring->desc_next = next;
292 vring->desc_in_use = used;
293 if ((vring->used->flags & VIRTIO_RING_FLAG_MASK_INT) == 0)
294 virtio_kick (vm, vring, vif);
299 vlib_error_count (vm, node->node_index, VIRTIO_TX_ERROR_NO_FREE_SLOTS,
301 vlib_buffer_free (vm, buffers, n_left);
304 clib_spinlock_unlock_if_init (&vring->lockp);
306 return frame->n_vectors - n_left;
309 VNET_DEVICE_CLASS_TX_FN (virtio_device_class) (vlib_main_t * vm,
310 vlib_node_runtime_t * node,
311 vlib_frame_t * frame)
313 virtio_main_t *nm = &virtio_main;
314 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
315 virtio_if_t *vif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
317 if (vif->gso_enabled > 0)
318 return virtio_interface_tx_inline (vm, node, frame, vif, 1 /* do_gso */ );
320 return virtio_interface_tx_inline (vm, node, frame, vif,
325 virtio_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
328 virtio_main_t *apm = &virtio_main;
329 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
330 virtio_if_t *vif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
332 /* Shut off redirection */
333 if (node_index == ~0)
335 vif->per_interface_next_index = node_index;
339 vif->per_interface_next_index =
340 vlib_node_add_next (vlib_get_main (), virtio_input_node.index,
345 virtio_clear_hw_interface_counters (u32 instance)
347 /* Nothing for now */
350 static clib_error_t *
351 virtio_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
352 vnet_hw_interface_rx_mode mode)
354 virtio_main_t *mm = &virtio_main;
355 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
356 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
357 virtio_vring_t *vring = vec_elt_at_index (vif->rxq_vrings, qid);
359 if (vif->type == VIRTIO_IF_TYPE_PCI && !(vif->support_int_mode))
361 vring->avail->flags |= VIRTIO_RING_FLAG_MASK_INT;
362 return clib_error_return (0, "interrupt mode is not supported");
365 if (mode == VNET_HW_INTERFACE_RX_MODE_POLLING)
366 vring->avail->flags |= VIRTIO_RING_FLAG_MASK_INT;
368 vring->avail->flags &= ~VIRTIO_RING_FLAG_MASK_INT;
373 static clib_error_t *
374 virtio_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
376 virtio_main_t *mm = &virtio_main;
377 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
378 virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
380 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
381 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
383 vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP;
388 static clib_error_t *
389 virtio_subif_add_del_function (vnet_main_t * vnm,
391 struct vnet_sw_interface_t *st, int is_add)
393 /* Nothing for now */
398 VNET_DEVICE_CLASS (virtio_device_class) = {
400 .format_device_name = format_virtio_device_name,
401 .format_device = format_virtio_device,
402 .format_tx_trace = format_virtio_tx_trace,
403 .tx_function_n_errors = VIRTIO_TX_N_ERROR,
404 .tx_function_error_strings = virtio_tx_func_error_strings,
405 .rx_redirect_to_node = virtio_set_interface_next_node,
406 .clear_counters = virtio_clear_hw_interface_counters,
407 .admin_up_down_function = virtio_interface_admin_up_down,
408 .subif_add_del_function = virtio_subif_add_del_function,
409 .rx_mode_change_function = virtio_interface_rx_mode_change,
414 * fd.io coding-style-patch-verification: ON
417 * eval: (c-set-style "gnu")