Line data Source code
1 : /*
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:
7 : *
8 : * http://www.apache.org/licenses/LICENSE-2.0
9 : *
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 : *------------------------------------------------------------------
16 : */
17 :
18 : #include <sys/types.h>
19 : #include <sys/stat.h>
20 : #include <fcntl.h>
21 :
22 : #include <vlib/vlib.h>
23 : #include <vlib/unix/unix.h>
24 : #include <vnet/vnet.h>
25 : #include <vnet/ethernet/ethernet.h>
26 : #include <vnet/gso/gro_func.h>
27 : #include <vnet/gso/hdr_offset_parser.h>
28 : #include <vnet/ip/ip4_packet.h>
29 : #include <vnet/ip/ip6_packet.h>
30 : #include <vnet/ip/ip_psh_cksum.h>
31 : #include <vnet/tcp/tcp_packet.h>
32 : #include <vnet/udp/udp_packet.h>
33 : #include <vnet/devices/virtio/virtio.h>
34 :
35 : #define VIRTIO_TX_MAX_CHAIN_LEN 127
36 :
37 : #define foreach_virtio_tx_func_error \
38 : _(NO_FREE_SLOTS, "no free tx slots") \
39 : _(TRUNC_PACKET, "packet > buffer size -- truncated in tx ring") \
40 : _(PENDING_MSGS, "pending msgs in tx ring") \
41 : _(INDIRECT_DESC_ALLOC_FAILED, "indirect descriptor allocation failed - packet drop") \
42 : _(OUT_OF_ORDER, "out-of-order buffers in used ring") \
43 : _(GSO_PACKET_DROP, "gso disabled on itf -- gso packet drop") \
44 : _(CSUM_OFFLOAD_PACKET_DROP, "checksum offload disabled on itf -- csum offload packet drop")
45 :
46 : typedef enum
47 : {
48 : #define _(f,s) VIRTIO_TX_ERROR_##f,
49 : foreach_virtio_tx_func_error
50 : #undef _
51 : VIRTIO_TX_N_ERROR,
52 : } virtio_tx_func_error_t;
53 :
54 : static char *virtio_tx_func_error_strings[] = {
55 : #define _(n,s) s,
56 : foreach_virtio_tx_func_error
57 : #undef _
58 : };
59 :
60 : static u8 *
61 0 : format_virtio_device (u8 * s, va_list * args)
62 : {
63 0 : u32 dev_instance = va_arg (*args, u32);
64 0 : int verbose = va_arg (*args, int);
65 0 : u32 indent = format_get_indent (s);
66 0 : virtio_main_t *vim = &virtio_main;
67 0 : virtio_if_t *vif = vec_elt_at_index (vim->interfaces, dev_instance);
68 0 : vnet_virtio_vring_t *vring = 0;
69 :
70 0 : s = format (s, "VIRTIO interface");
71 0 : if (verbose)
72 : {
73 0 : s = format (s, "\n%U instance %u", format_white_space, indent + 2,
74 : dev_instance);
75 0 : s = format (s, "\n%U RX QUEUE : Total Packets", format_white_space,
76 : indent + 4);
77 0 : vec_foreach (vring, vif->rxq_vrings)
78 : {
79 0 : s = format (s, "\n%U %8u : %llu", format_white_space, indent + 4,
80 0 : RX_QUEUE_ACCESS (vring->queue_id), vring->total_packets);
81 : }
82 0 : s = format (s, "\n%U TX QUEUE : Total Packets", format_white_space,
83 : indent + 4);
84 0 : vec_foreach (vring, vif->txq_vrings)
85 : {
86 0 : s = format (s, "\n%U %8u : %llu", format_white_space, indent + 4,
87 0 : TX_QUEUE_ACCESS (vring->queue_id), vring->total_packets);
88 : }
89 : }
90 :
91 0 : return s;
92 : }
93 :
94 : typedef struct
95 : {
96 : u32 buffer_index;
97 : u32 sw_if_index;
98 : generic_header_offset_t gho;
99 : vlib_buffer_t buffer;
100 : } virtio_tx_trace_t;
101 :
102 : static u8 *
103 0 : format_virtio_tx_trace (u8 * s, va_list * va)
104 : {
105 0 : CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
106 0 : CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
107 0 : virtio_tx_trace_t *t = va_arg (*va, virtio_tx_trace_t *);
108 0 : u32 indent = format_get_indent (s);
109 :
110 0 : s = format (s, "%Ubuffer 0x%x: %U\n", format_white_space, indent,
111 : t->buffer_index, format_vnet_buffer_no_chain, &t->buffer);
112 : s =
113 0 : format (s, "%U%U\n", format_white_space, indent,
114 : format_generic_header_offset, &t->gho);
115 : s =
116 0 : format (s, "%U%U", format_white_space, indent,
117 0 : format_ethernet_header_with_length, t->buffer.pre_data,
118 : sizeof (t->buffer.pre_data));
119 0 : return s;
120 : }
121 :
122 : static void
123 0 : virtio_tx_trace (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_buffer_t *b0,
124 : u32 bi, int is_tun)
125 : {
126 : virtio_tx_trace_t *t;
127 0 : t = vlib_add_trace (vm, node, b0, sizeof (t[0]));
128 0 : t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX];
129 0 : t->buffer_index = bi;
130 0 : clib_memset (&t->gho, 0, sizeof (t->gho));
131 0 : if (is_tun)
132 : {
133 0 : int is_ip4 = 0, is_ip6 = 0;
134 :
135 0 : switch (((u8 *) vlib_buffer_get_current (b0))[0] & 0xf0)
136 : {
137 0 : case 0x40:
138 0 : is_ip4 = 1;
139 0 : break;
140 0 : case 0x60:
141 0 : is_ip6 = 1;
142 0 : break;
143 0 : default:
144 0 : break;
145 : }
146 0 : vnet_generic_header_offset_parser (b0, &t->gho, 0, is_ip4, is_ip6);
147 : }
148 : else
149 0 : vnet_generic_header_offset_parser (b0, &t->gho, 1,
150 0 : b0->flags &
151 : VNET_BUFFER_F_IS_IP4,
152 0 : b0->flags & VNET_BUFFER_F_IS_IP6);
153 :
154 0 : clib_memcpy_fast (&t->buffer, b0, sizeof (*b0) - sizeof (b0->pre_data));
155 0 : clib_memcpy_fast (t->buffer.pre_data, vlib_buffer_get_current (b0),
156 : sizeof (t->buffer.pre_data));
157 0 : }
158 :
159 : static void
160 757 : virtio_interface_drop_inline (vlib_main_t *vm, virtio_if_t *vif,
161 : uword node_index, u32 *buffers, u16 n,
162 : virtio_tx_func_error_t error)
163 : {
164 757 : vlib_error_count (vm, node_index, error, n);
165 757 : vlib_increment_simple_counter (vnet_main.interface_main.sw_if_counters +
166 : VNET_INTERFACE_COUNTER_DROP,
167 : vm->thread_index, vif->sw_if_index, n);
168 757 : vlib_buffer_free (vm, buffers, n);
169 757 : }
170 :
171 : static void
172 1076260 : virtio_memset_ring_u32 (u32 *ring, u32 start, u32 ring_size, u32 n_buffers)
173 : {
174 1076260 : ASSERT (n_buffers <= ring_size);
175 :
176 1076260 : if (PREDICT_TRUE (start + n_buffers <= ring_size))
177 : {
178 942473 : clib_memset_u32 (ring + start, ~0, n_buffers);
179 : }
180 : else
181 : {
182 133791 : clib_memset_u32 (ring + start, ~0, ring_size - start);
183 133791 : clib_memset_u32 (ring, ~0, n_buffers - (ring_size - start));
184 : }
185 1076260 : }
186 :
187 : static void
188 1245470 : virtio_free_used_device_desc_split (vlib_main_t *vm,
189 : vnet_virtio_vring_t *vring,
190 : uword node_index)
191 : {
192 1245470 : u16 used = vring->desc_in_use;
193 1245470 : u16 sz = vring->queue_size;
194 1245470 : u16 mask = sz - 1;
195 1245470 : u16 last = vring->last_used_idx;
196 1245470 : u16 n_left = vring->used->idx - last;
197 1245470 : u16 out_of_order_count = 0;
198 :
199 1245470 : if (n_left == 0)
200 169204 : return;
201 :
202 2152530 : while (n_left)
203 : {
204 1076260 : vnet_virtio_vring_used_elem_t *e = &vring->used->ring[last & mask];
205 : u16 slot, n_buffers;
206 1076260 : slot = n_buffers = e->id;
207 :
208 35368900 : while (e->id == (n_buffers & mask))
209 : {
210 35368900 : n_left--;
211 35368900 : last++;
212 35368900 : n_buffers++;
213 35368900 : vnet_virtio_vring_desc_t *d = &vring->desc[e->id];
214 : u16 next;
215 35368900 : while (d->flags & VRING_DESC_F_NEXT)
216 : {
217 0 : n_buffers++;
218 0 : next = d->next;
219 0 : d = &vring->desc[next];
220 : }
221 35368900 : if (n_left == 0)
222 1076260 : break;
223 34292600 : e = &vring->used->ring[last & mask];
224 : }
225 1076260 : vlib_buffer_free_from_ring (vm, vring->buffers, slot,
226 1076260 : sz, (n_buffers - slot));
227 1076260 : virtio_memset_ring_u32 (vring->buffers, slot, sz, (n_buffers - slot));
228 1076260 : used -= (n_buffers - slot);
229 :
230 1076260 : if (n_left > 0)
231 : {
232 0 : vlib_buffer_free (vm, &vring->buffers[e->id], 1);
233 0 : vring->buffers[e->id] = ~0;
234 0 : used--;
235 0 : last++;
236 0 : n_left--;
237 0 : out_of_order_count++;
238 0 : vring->flags |= VRING_TX_OUT_OF_ORDER;
239 : }
240 : }
241 :
242 : /*
243 : * Some vhost-backends give buffers back in out-of-order fashion in used ring.
244 : * It impacts the overall virtio-performance.
245 : */
246 1076260 : if (out_of_order_count)
247 0 : vlib_error_count (vm, node_index, VIRTIO_TX_ERROR_OUT_OF_ORDER,
248 : out_of_order_count);
249 :
250 1076260 : vring->desc_in_use = used;
251 1076260 : vring->last_used_idx = last;
252 : }
253 :
254 : static void
255 0 : virtio_free_used_device_desc_packed (vlib_main_t *vm,
256 : vnet_virtio_vring_t *vring,
257 : uword node_index)
258 : {
259 : vnet_virtio_vring_packed_desc_t *d;
260 0 : u16 sz = vring->queue_size;
261 0 : u16 last = vring->last_used_idx;
262 0 : u16 n_buffers = 0, start;
263 : u16 flags;
264 :
265 0 : if (vring->desc_in_use == 0)
266 0 : return;
267 :
268 0 : d = &vring->packed_desc[last];
269 0 : flags = d->flags;
270 0 : start = d->id;
271 :
272 0 : while ((flags & VRING_DESC_F_AVAIL) == (vring->used_wrap_counter << 7) &&
273 0 : (flags & VRING_DESC_F_USED) == (vring->used_wrap_counter << 15))
274 : {
275 0 : last++;
276 0 : n_buffers++;
277 :
278 0 : if (last >= sz)
279 : {
280 0 : last = 0;
281 0 : vring->used_wrap_counter ^= 1;
282 : }
283 0 : d = &vring->packed_desc[last];
284 0 : flags = d->flags;
285 : }
286 :
287 0 : if (n_buffers)
288 : {
289 0 : vlib_buffer_free_from_ring (vm, vring->buffers, start, sz, n_buffers);
290 0 : virtio_memset_ring_u32 (vring->buffers, start, sz, n_buffers);
291 0 : vring->desc_in_use -= n_buffers;
292 0 : vring->last_used_idx = last;
293 : }
294 : }
295 :
296 : static void
297 1245470 : virtio_free_used_device_desc (vlib_main_t *vm, vnet_virtio_vring_t *vring,
298 : uword node_index, int packed)
299 : {
300 1245470 : if (packed)
301 0 : virtio_free_used_device_desc_packed (vm, vring, node_index);
302 : else
303 1245470 : virtio_free_used_device_desc_split (vm, vring, node_index);
304 :
305 1245470 : }
306 :
307 : static void
308 0 : set_checksum_offsets (vlib_buffer_t *b, vnet_virtio_net_hdr_v1_t *hdr,
309 : const int is_l2)
310 : {
311 0 : vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags;
312 0 : i16 l4_hdr_offset = vnet_buffer (b)->l4_hdr_offset - b->current_data;
313 0 : if (b->flags & VNET_BUFFER_F_IS_IP4)
314 : {
315 : ip4_header_t *ip4;
316 0 : hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
317 0 : hdr->csum_start = l4_hdr_offset; // 0x22;
318 :
319 : /*
320 : * virtio devices do not support IP4 checksum offload. So driver takes
321 : * care of it while doing tx.
322 : */
323 0 : ip4 = (ip4_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
324 0 : if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
325 0 : ip4->checksum = ip4_header_checksum (ip4);
326 :
327 : /*
328 : * virtio devices assume the l4 header is set to the checksum of the
329 : * l3 pseudo-header, so we compute it before tx-ing
330 : */
331 0 : if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
332 : {
333 0 : tcp_header_t *tcp =
334 0 : (tcp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
335 0 : tcp->checksum = ip4_pseudo_header_cksum (ip4);
336 0 : hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
337 : }
338 0 : else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
339 : {
340 0 : udp_header_t *udp =
341 0 : (udp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
342 0 : udp->checksum = ip4_pseudo_header_cksum (ip4);
343 0 : hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
344 : }
345 : }
346 0 : else if (b->flags & VNET_BUFFER_F_IS_IP6)
347 : {
348 : ip6_header_t *ip6;
349 0 : hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
350 0 : hdr->csum_start = l4_hdr_offset; // 0x36;
351 0 : ip6 = (ip6_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
352 :
353 : /*
354 : * virtio devices assume the l4 header is set to the checksum of the
355 : * l3 pseudo-header, so we compute it before tx-ing
356 : */
357 0 : if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
358 : {
359 0 : tcp_header_t *tcp =
360 0 : (tcp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
361 0 : tcp->checksum = ip6_pseudo_header_cksum (ip6);
362 0 : hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
363 : }
364 0 : else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
365 : {
366 0 : udp_header_t *udp =
367 0 : (udp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset);
368 0 : udp->checksum = ip6_pseudo_header_cksum (ip6);
369 0 : hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
370 : }
371 : }
372 0 : }
373 :
374 : static void
375 1250560 : set_gso_offsets (vlib_buffer_t *b, vnet_virtio_net_hdr_v1_t *hdr,
376 : const int is_l2)
377 : {
378 1250560 : vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags;
379 1250560 : i16 l4_hdr_offset = vnet_buffer (b)->l4_hdr_offset - b->current_data;
380 :
381 1250560 : if (b->flags & VNET_BUFFER_F_IS_IP4)
382 : {
383 : ip4_header_t *ip4;
384 669535 : hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
385 669535 : hdr->gso_size = vnet_buffer2 (b)->gso_size;
386 669535 : hdr->hdr_len = l4_hdr_offset + vnet_buffer2 (b)->gso_l4_hdr_sz;
387 669535 : hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
388 669535 : hdr->csum_start = l4_hdr_offset; // 0x22;
389 669535 : hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
390 669535 : ip4 = (ip4_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset);
391 : /*
392 : * virtio devices do not support IP4 checksum offload. So driver takes care
393 : * of it while doing tx.
394 : */
395 669535 : if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
396 669535 : ip4->checksum = ip4_header_checksum (ip4);
397 : }
398 581029 : else if (b->flags & VNET_BUFFER_F_IS_IP6)
399 : {
400 581029 : hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
401 581029 : hdr->gso_size = vnet_buffer2 (b)->gso_size;
402 581029 : hdr->hdr_len = l4_hdr_offset + vnet_buffer2 (b)->gso_l4_hdr_sz;
403 581029 : hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
404 581029 : hdr->csum_start = l4_hdr_offset; // 0x36;
405 581029 : hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
406 : }
407 1250560 : }
408 :
409 : static u16
410 35369200 : add_buffer_to_slot (vlib_main_t *vm, vlib_node_runtime_t *node,
411 : virtio_if_t *vif, vnet_virtio_vring_t *vring, u32 bi,
412 : u16 free_desc_count, u16 avail, u16 next, u16 mask,
413 : int hdr_sz, int do_gso, int csum_offload, int is_pci,
414 : int is_tun, int is_indirect, int is_any_layout)
415 : {
416 35369200 : u16 n_added = 0;
417 : vnet_virtio_vring_desc_t *d;
418 35369200 : int is_l2 = !is_tun;
419 35369200 : d = &vring->desc[next];
420 35369200 : vlib_buffer_t *b = vlib_get_buffer (vm, bi);
421 35369200 : vnet_virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
422 35369200 : u32 drop_inline = ~0;
423 :
424 35369200 : clib_memset_u8 (hdr, 0, hdr_sz);
425 :
426 35369200 : vring->total_packets++;
427 35369200 : if (b->flags & VNET_BUFFER_F_GSO)
428 : {
429 1250560 : if (do_gso)
430 1250560 : set_gso_offsets (b, hdr, is_l2);
431 : else
432 : {
433 0 : drop_inline = VIRTIO_TX_ERROR_GSO_PACKET_DROP;
434 0 : goto done;
435 : }
436 : }
437 34118600 : else if (b->flags & VNET_BUFFER_F_OFFLOAD)
438 : {
439 0 : if (csum_offload)
440 0 : set_checksum_offsets (b, hdr, is_l2);
441 : else
442 : {
443 0 : drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
444 0 : goto done;
445 : }
446 : }
447 :
448 35369200 : if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
449 : {
450 0 : virtio_tx_trace (vm, node, b, bi, is_tun);
451 : }
452 :
453 35369200 : if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
454 : {
455 16750200 : d->addr = ((is_pci) ? vlib_buffer_get_current_pa (vm, b) :
456 33500400 : pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
457 16750200 : d->len = b->current_length + hdr_sz;
458 16750200 : d->flags = 0;
459 : }
460 18619000 : else if (is_indirect)
461 : {
462 : /*
463 : * We are using single vlib_buffer_t for indirect descriptor(s)
464 : * chain. Single descriptor is 16 bytes and vlib_buffer_t
465 : * has 2048 bytes space. So maximum long chain can have 128
466 : * (=2048/16) indirect descriptors.
467 : * It can easily support 65535 bytes of Jumbo frames with
468 : * each data buffer size of 512 bytes minimum.
469 : */
470 18619000 : u32 indirect_buffer = 0;
471 18619000 : if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
472 : {
473 0 : drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
474 0 : goto done;
475 : }
476 :
477 18619000 : vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
478 18619000 : indirect_desc->current_data = 0;
479 18619000 : indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
480 18619000 : indirect_desc->next_buffer = bi;
481 18619000 : bi = indirect_buffer;
482 :
483 : vnet_virtio_vring_desc_t *id =
484 18619000 : (vnet_virtio_vring_desc_t *) vlib_buffer_get_current (indirect_desc);
485 18619000 : u32 count = 1;
486 18619000 : if (is_pci)
487 : {
488 0 : d->addr = vlib_physmem_get_pa (vm, id);
489 0 : id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
490 :
491 : /*
492 : * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
493 : * should be presented in separate descriptor and data will start
494 : * from next descriptor.
495 : */
496 0 : if (is_any_layout)
497 0 : id->len = b->current_length + hdr_sz;
498 : else
499 : {
500 0 : id->len = hdr_sz;
501 0 : id->flags = VRING_DESC_F_NEXT;
502 0 : id->next = count;
503 0 : count++;
504 0 : id++;
505 0 : id->addr = vlib_buffer_get_current_pa (vm, b);
506 0 : id->len = b->current_length;
507 : }
508 0 : while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
509 : {
510 0 : id->flags = VRING_DESC_F_NEXT;
511 0 : id->next = count;
512 0 : count++;
513 0 : id++;
514 0 : b = vlib_get_buffer (vm, b->next_buffer);
515 0 : id->addr = vlib_buffer_get_current_pa (vm, b);
516 0 : id->len = b->current_length;
517 0 : if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
518 : {
519 0 : if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
520 0 : vlib_error_count (vm, node->node_index,
521 : VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
522 0 : break;
523 : }
524 : }
525 : }
526 : else /* VIRTIO_IF_TYPE_[TAP | TUN] */
527 : {
528 18619000 : d->addr = pointer_to_uword (id);
529 : /* first buffer in chain */
530 18619000 : id->addr = pointer_to_uword (vlib_buffer_get_current (b)) - hdr_sz;
531 18619000 : id->len = b->current_length + hdr_sz;
532 :
533 102496000 : while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
534 : {
535 83877400 : id->flags = VRING_DESC_F_NEXT;
536 83877400 : id->next = count;
537 83877400 : count++;
538 83877400 : id++;
539 83877400 : b = vlib_get_buffer (vm, b->next_buffer);
540 83877400 : id->addr = pointer_to_uword (vlib_buffer_get_current (b));
541 83877400 : id->len = b->current_length;
542 83877400 : if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
543 : {
544 0 : if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
545 0 : vlib_error_count (vm, node->node_index,
546 : VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
547 0 : break;
548 : }
549 : }
550 : }
551 18619000 : id->flags = 0;
552 18619000 : id->next = 0;
553 18619000 : d->len = count * sizeof (vnet_virtio_vring_desc_t);
554 18619000 : d->flags = VRING_DESC_F_INDIRECT;
555 : }
556 0 : else if (is_pci)
557 : {
558 0 : u16 count = next;
559 0 : vlib_buffer_t *b_temp = b;
560 0 : u16 n_buffers_in_chain = 1;
561 :
562 : /*
563 : * Check the length of the chain for the required number of
564 : * descriptors. Return from here, retry to get more descriptors,
565 : * if chain length is greater than available descriptors.
566 : */
567 0 : while (b_temp->flags & VLIB_BUFFER_NEXT_PRESENT)
568 : {
569 0 : n_buffers_in_chain++;
570 0 : b_temp = vlib_get_buffer (vm, b_temp->next_buffer);
571 : }
572 :
573 0 : if (n_buffers_in_chain > free_desc_count)
574 0 : return n_buffers_in_chain;
575 :
576 0 : d->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
577 0 : d->len = b->current_length + hdr_sz;
578 :
579 0 : while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
580 : {
581 0 : d->flags = VRING_DESC_F_NEXT;
582 0 : vring->buffers[count] = bi;
583 0 : b->flags &=
584 : ~(VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID);
585 0 : bi = b->next_buffer;
586 0 : b->next_buffer = 0;
587 0 : n_added++;
588 0 : count = (count + 1) & mask;
589 0 : d->next = count;
590 0 : d = &vring->desc[count];
591 0 : b = vlib_get_buffer (vm, bi);
592 0 : d->addr = vlib_buffer_get_current_pa (vm, b);
593 0 : d->len = b->current_length;
594 : }
595 0 : d->flags = 0;
596 0 : vring->buffers[count] = bi;
597 0 : vring->avail->ring[avail & mask] = next;
598 0 : n_added++;
599 0 : return n_added;
600 : }
601 : else
602 : {
603 0 : ASSERT (0);
604 : }
605 35369200 : vring->buffers[next] = bi;
606 35369200 : vring->avail->ring[avail & mask] = next;
607 35369200 : n_added++;
608 :
609 35369200 : done:
610 35369200 : if (drop_inline != ~0)
611 0 : virtio_interface_drop_inline (vm, vif, node->node_index, &bi, 1,
612 : drop_inline);
613 :
614 35369200 : return n_added;
615 : }
616 :
617 : static u16
618 0 : add_buffer_to_slot_packed (vlib_main_t *vm, vlib_node_runtime_t *node,
619 : virtio_if_t *vif, vnet_virtio_vring_t *vring,
620 : u32 bi, u16 next, int hdr_sz, int do_gso,
621 : int csum_offload, int is_pci, int is_tun,
622 : int is_indirect, int is_any_layout)
623 : {
624 0 : u16 n_added = 0, flags = 0;
625 0 : int is_l2 = !is_tun;
626 0 : vnet_virtio_vring_packed_desc_t *d = &vring->packed_desc[next];
627 0 : vlib_buffer_t *b = vlib_get_buffer (vm, bi);
628 0 : vnet_virtio_net_hdr_v1_t *hdr = vlib_buffer_get_current (b) - hdr_sz;
629 0 : u32 drop_inline = ~0;
630 :
631 0 : clib_memset (hdr, 0, hdr_sz);
632 :
633 0 : vring->total_packets++;
634 :
635 0 : if (b->flags & VNET_BUFFER_F_GSO)
636 : {
637 0 : if (do_gso)
638 0 : set_gso_offsets (b, hdr, is_l2);
639 : else
640 : {
641 0 : drop_inline = VIRTIO_TX_ERROR_GSO_PACKET_DROP;
642 0 : goto done;
643 : }
644 : }
645 0 : else if (b->flags & VNET_BUFFER_F_OFFLOAD)
646 : {
647 0 : if (csum_offload)
648 0 : set_checksum_offsets (b, hdr, is_l2);
649 : else
650 : {
651 0 : drop_inline = VIRTIO_TX_ERROR_CSUM_OFFLOAD_PACKET_DROP;
652 0 : goto done;
653 : }
654 : }
655 0 : if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
656 : {
657 0 : virtio_tx_trace (vm, node, b, bi, is_tun);
658 : }
659 :
660 0 : if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0))
661 : {
662 0 : d->addr =
663 0 : ((is_pci) ? vlib_buffer_get_current_pa (vm,
664 0 : b) :
665 0 : pointer_to_uword (vlib_buffer_get_current (b))) - hdr_sz;
666 0 : d->len = b->current_length + hdr_sz;
667 : }
668 0 : else if (is_indirect)
669 : {
670 : /*
671 : * We are using single vlib_buffer_t for indirect descriptor(s)
672 : * chain. Single descriptor is 16 bytes and vlib_buffer_t
673 : * has 2048 bytes space. So maximum long chain can have 128
674 : * (=2048/16) indirect descriptors.
675 : * It can easily support 65535 bytes of Jumbo frames with
676 : * each data buffer size of 512 bytes minimum.
677 : */
678 0 : u32 indirect_buffer = 0;
679 0 : if (PREDICT_FALSE (vlib_buffer_alloc (vm, &indirect_buffer, 1) == 0))
680 : {
681 0 : drop_inline = VIRTIO_TX_ERROR_INDIRECT_DESC_ALLOC_FAILED;
682 0 : goto done;
683 : }
684 :
685 0 : vlib_buffer_t *indirect_desc = vlib_get_buffer (vm, indirect_buffer);
686 0 : indirect_desc->current_data = 0;
687 0 : indirect_desc->flags |= VLIB_BUFFER_NEXT_PRESENT;
688 0 : indirect_desc->next_buffer = bi;
689 0 : bi = indirect_buffer;
690 :
691 : vnet_virtio_vring_packed_desc_t *id =
692 0 : (vnet_virtio_vring_packed_desc_t *) vlib_buffer_get_current (
693 : indirect_desc);
694 0 : u32 count = 1;
695 0 : if (is_pci)
696 : {
697 0 : d->addr = vlib_physmem_get_pa (vm, id);
698 0 : id->addr = vlib_buffer_get_current_pa (vm, b) - hdr_sz;
699 :
700 : /*
701 : * If VIRTIO_F_ANY_LAYOUT is not negotiated, then virtio_net_hdr
702 : * should be presented in separate descriptor and data will start
703 : * from next descriptor.
704 : */
705 0 : if (is_any_layout)
706 0 : id->len = b->current_length + hdr_sz;
707 : else
708 : {
709 0 : id->len = hdr_sz;
710 0 : id->flags = 0;
711 0 : id->id = 0;
712 0 : count++;
713 0 : id++;
714 0 : id->addr = vlib_buffer_get_current_pa (vm, b);
715 0 : id->len = b->current_length;
716 : }
717 0 : while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
718 : {
719 0 : id->flags = 0;
720 0 : id->id = 0;
721 0 : count++;
722 0 : id++;
723 0 : b = vlib_get_buffer (vm, b->next_buffer);
724 0 : id->addr = vlib_buffer_get_current_pa (vm, b);
725 0 : id->len = b->current_length;
726 0 : if (PREDICT_FALSE (count == VIRTIO_TX_MAX_CHAIN_LEN))
727 : {
728 0 : if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
729 0 : vlib_error_count (vm, node->node_index,
730 : VIRTIO_TX_ERROR_TRUNC_PACKET, 1);
731 0 : break;
732 : }
733 : }
734 : }
735 0 : id->flags = 0;
736 0 : id->id = 0;
737 0 : d->len = count * sizeof (vnet_virtio_vring_packed_desc_t);
738 0 : flags = VRING_DESC_F_INDIRECT;
739 : }
740 : else
741 : {
742 0 : ASSERT (0);
743 : }
744 0 : if (vring->avail_wrap_counter)
745 : {
746 0 : flags |= VRING_DESC_F_AVAIL;
747 0 : flags &= ~VRING_DESC_F_USED;
748 : }
749 : else
750 : {
751 0 : flags &= ~VRING_DESC_F_AVAIL;
752 0 : flags |= VRING_DESC_F_USED;
753 : }
754 :
755 0 : d->id = next;
756 0 : d->flags = flags;
757 0 : vring->buffers[next] = bi;
758 0 : n_added++;
759 :
760 0 : done:
761 0 : if (drop_inline != ~0)
762 0 : virtio_interface_drop_inline (vm, vif, node->node_index, &bi, 1,
763 : drop_inline);
764 :
765 0 : return n_added;
766 : }
767 :
768 : static uword
769 0 : virtio_interface_tx_packed_gso_inline (
770 : vlib_main_t *vm, vlib_node_runtime_t *node, virtio_if_t *vif,
771 : virtio_if_type_t type, vnet_virtio_vring_t *vring, u32 *buffers, u16 n_left,
772 : const int do_gso, const int csum_offload)
773 : {
774 0 : int is_pci = (type == VIRTIO_IF_TYPE_PCI);
775 0 : int is_tun = (type == VIRTIO_IF_TYPE_TUN);
776 0 : int is_indirect =
777 0 : ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
778 0 : int is_any_layout =
779 0 : ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
780 0 : const int hdr_sz = vif->virtio_net_hdr_sz;
781 0 : u16 sz = vring->queue_size;
782 0 : u16 used, next, n_buffers = 0, n_buffers_left = 0;
783 0 : u16 n_vectors = n_left;
784 :
785 :
786 0 : used = vring->desc_in_use;
787 0 : next = vring->desc_next;
788 :
789 0 : if (vif->packet_buffering)
790 : {
791 0 : n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
792 :
793 0 : while (n_buffers_left && used < sz)
794 : {
795 0 : u16 n_added = 0;
796 :
797 0 : u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
798 0 : if (bi == ~0)
799 0 : break;
800 0 : n_added = add_buffer_to_slot_packed (
801 : vm, node, vif, vring, bi, next, hdr_sz, do_gso, csum_offload,
802 : is_pci, is_tun, is_indirect, is_any_layout);
803 0 : n_buffers_left--;
804 0 : if (PREDICT_FALSE (n_added == 0))
805 0 : continue;
806 :
807 0 : used++;
808 0 : next++;
809 0 : if (next >= sz)
810 : {
811 0 : next = 0;
812 0 : vring->avail_wrap_counter ^= 1;
813 : }
814 : }
815 0 : virtio_txq_clear_scheduled (vring);
816 : }
817 :
818 0 : while (n_left && used < sz)
819 : {
820 0 : u16 n_added = 0;
821 :
822 0 : n_added = add_buffer_to_slot_packed (
823 : vm, node, vif, vring, buffers[0], next, hdr_sz, do_gso, csum_offload,
824 : is_pci, is_tun, is_indirect, is_any_layout);
825 0 : buffers++;
826 0 : n_left--;
827 0 : if (PREDICT_FALSE (n_added == 0))
828 0 : continue;
829 :
830 0 : used++;
831 0 : next++;
832 0 : if (next >= sz)
833 : {
834 0 : next = 0;
835 0 : vring->avail_wrap_counter ^= 1;
836 : }
837 : }
838 :
839 0 : if (n_left != n_vectors || n_buffers != n_buffers_left)
840 : {
841 0 : CLIB_MEMORY_STORE_BARRIER ();
842 0 : vring->desc_next = next;
843 0 : vring->desc_in_use = used;
844 0 : CLIB_MEMORY_BARRIER ();
845 0 : if (vring->device_event->flags != VRING_EVENT_F_DISABLE)
846 0 : virtio_kick (vm, vring, vif);
847 : }
848 :
849 0 : return n_left;
850 : }
851 :
852 : static void
853 0 : virtio_find_free_desc (vnet_virtio_vring_t *vring, u16 size, u16 mask, u16 req,
854 : u16 next, u32 *first_free_desc_index,
855 : u16 *free_desc_count)
856 : {
857 0 : u16 start = 0;
858 : /* next is used as hint: from where to start looking */
859 0 : for (u16 i = 0; i < size; i++, next++)
860 : {
861 0 : if (vring->buffers[next & mask] == ~0)
862 : {
863 0 : if (*first_free_desc_index == ~0)
864 : {
865 0 : *first_free_desc_index = (next & mask);
866 0 : start = i;
867 0 : (*free_desc_count)++;
868 0 : req--;
869 0 : if (req == 0)
870 0 : break;
871 : }
872 : else
873 : {
874 0 : if (start + *free_desc_count == i)
875 : {
876 0 : (*free_desc_count)++;
877 0 : req--;
878 0 : if (req == 0)
879 0 : break;
880 : }
881 : else
882 0 : break;
883 : }
884 : }
885 : }
886 0 : }
887 :
888 : static u16
889 1245470 : virtio_interface_tx_split_gso_inline (vlib_main_t *vm,
890 : vlib_node_runtime_t *node,
891 : virtio_if_t *vif, virtio_if_type_t type,
892 : vnet_virtio_vring_t *vring, u32 *buffers,
893 : u16 n_left, int do_gso, int csum_offload)
894 : {
895 1245470 : u16 used, next, avail, n_buffers = 0, n_buffers_left = 0;
896 1245470 : int is_pci = (type == VIRTIO_IF_TYPE_PCI);
897 1245470 : int is_tun = (type == VIRTIO_IF_TYPE_TUN);
898 1245470 : int is_indirect =
899 1245470 : ((vif->features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) != 0);
900 1245470 : int is_any_layout =
901 1245470 : ((vif->features & VIRTIO_FEATURE (VIRTIO_F_ANY_LAYOUT)) != 0);
902 1245470 : u16 sz = vring->queue_size;
903 1245470 : int hdr_sz = vif->virtio_net_hdr_sz;
904 1245470 : u16 mask = sz - 1;
905 1245470 : u16 n_vectors = n_left;
906 :
907 1245470 : used = vring->desc_in_use;
908 1245470 : next = vring->desc_next;
909 1245470 : avail = vring->avail->idx;
910 :
911 1245470 : u16 free_desc_count = 0;
912 :
913 1245470 : if (PREDICT_FALSE (vring->flags & VRING_TX_OUT_OF_ORDER))
914 : {
915 0 : u32 first_free_desc_index = ~0;
916 :
917 0 : virtio_find_free_desc (vring, sz, mask, n_left, next,
918 : &first_free_desc_index, &free_desc_count);
919 :
920 0 : if (free_desc_count)
921 0 : next = first_free_desc_index;
922 : }
923 : else
924 1245470 : free_desc_count = sz - used;
925 :
926 1245470 : if (vif->packet_buffering)
927 : {
928 0 : n_buffers = n_buffers_left = virtio_vring_n_buffers (vring->buffering);
929 :
930 0 : while (n_buffers_left && free_desc_count)
931 : {
932 0 : u16 n_added = 0;
933 :
934 0 : u32 bi = virtio_vring_buffering_read_from_front (vring->buffering);
935 0 : if (bi == ~0)
936 0 : break;
937 :
938 0 : n_added = add_buffer_to_slot (vm, node, vif, vring, bi,
939 : free_desc_count, avail, next, mask,
940 : hdr_sz, do_gso, csum_offload, is_pci,
941 : is_tun, is_indirect, is_any_layout);
942 0 : if (PREDICT_FALSE (n_added == 0))
943 : {
944 0 : n_buffers_left--;
945 0 : continue;
946 : }
947 0 : else if (PREDICT_FALSE (n_added > free_desc_count))
948 0 : break;
949 :
950 0 : avail++;
951 0 : next = (next + n_added) & mask;
952 0 : used += n_added;
953 0 : n_buffers_left--;
954 0 : free_desc_count -= n_added;
955 : }
956 0 : virtio_txq_clear_scheduled (vring);
957 : }
958 :
959 36614700 : while (n_left && free_desc_count)
960 : {
961 35369200 : u16 n_added = 0;
962 :
963 : n_added =
964 35369200 : add_buffer_to_slot (vm, node, vif, vring, buffers[0], free_desc_count,
965 : avail, next, mask, hdr_sz, do_gso, csum_offload,
966 : is_pci, is_tun, is_indirect, is_any_layout);
967 :
968 35369200 : if (PREDICT_FALSE (n_added == 0))
969 : {
970 0 : buffers++;
971 0 : n_left--;
972 0 : continue;
973 : }
974 35369200 : else if (PREDICT_FALSE (n_added > free_desc_count))
975 0 : break;
976 :
977 35369200 : avail++;
978 35369200 : next = (next + n_added) & mask;
979 35369200 : used += n_added;
980 35369200 : buffers++;
981 35369200 : n_left--;
982 35369200 : free_desc_count -= n_added;
983 : }
984 :
985 1245470 : if (n_left != n_vectors || n_buffers != n_buffers_left)
986 : {
987 1243440 : clib_atomic_store_seq_cst (&vring->avail->idx, avail);
988 1243440 : vring->desc_next = next;
989 1243440 : vring->desc_in_use = used;
990 1243440 : if ((clib_atomic_load_seq_cst (&vring->used->flags) &
991 : VRING_USED_F_NO_NOTIFY) == 0)
992 962817 : virtio_kick (vm, vring, vif);
993 : }
994 :
995 1245470 : return n_left;
996 : }
997 :
998 : static u16
999 1245470 : virtio_interface_tx_gso_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1000 : virtio_if_t *vif, virtio_if_type_t type,
1001 : vnet_virtio_vring_t *vring, u32 *buffers,
1002 : u16 n_left, int packed, int do_gso,
1003 : int csum_offload)
1004 : {
1005 1245470 : if (packed)
1006 0 : return virtio_interface_tx_packed_gso_inline (vm, node, vif, type, vring,
1007 : buffers, n_left,
1008 : do_gso, csum_offload);
1009 : else
1010 1245470 : return virtio_interface_tx_split_gso_inline (vm, node, vif, type, vring,
1011 : buffers, n_left,
1012 : do_gso, csum_offload);
1013 : }
1014 :
1015 : static u16
1016 1245470 : virtio_interface_tx_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1017 : virtio_if_t *vif, vnet_virtio_vring_t *vring,
1018 : virtio_if_type_t type, u32 *buffers, u16 n_left,
1019 : int packed)
1020 : {
1021 1245470 : vnet_main_t *vnm = vnet_get_main ();
1022 1245470 : vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
1023 :
1024 1245470 : if (hw->caps & VNET_HW_IF_CAP_TCP_GSO)
1025 813648 : return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
1026 : buffers, n_left, packed,
1027 : 1 /* do_gso */ ,
1028 : 1 /* checksum offload */ );
1029 431820 : else if (hw->caps & VNET_HW_IF_CAP_L4_TX_CKSUM)
1030 0 : return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
1031 : buffers, n_left, packed,
1032 : 0 /* no do_gso */ ,
1033 : 1 /* checksum offload */ );
1034 : else
1035 431820 : return virtio_interface_tx_gso_inline (vm, node, vif, type, vring,
1036 : buffers, n_left, packed,
1037 : 0 /* no do_gso */ ,
1038 : 0 /* no checksum offload */ );
1039 : }
1040 :
1041 1245276 : VNET_DEVICE_CLASS_TX_FN (virtio_device_class) (vlib_main_t * vm,
1042 : vlib_node_runtime_t * node,
1043 : vlib_frame_t * frame)
1044 1243040 : {
1045 1243040 : virtio_main_t *nm = &virtio_main;
1046 1243040 : vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
1047 1243040 : virtio_if_t *vif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
1048 1243040 : vnet_hw_if_tx_frame_t *tf = vlib_frame_scalar_args (frame);
1049 1243040 : u16 qid = tf->queue_id;
1050 1243040 : vnet_virtio_vring_t *vring = vec_elt_at_index (vif->txq_vrings, qid);
1051 1243040 : u16 n_left = frame->n_vectors;
1052 1243040 : u32 *buffers = vlib_frame_vector_args (frame);
1053 1243040 : u32 to[GRO_TO_VECTOR_SIZE (n_left)];
1054 1243040 : int packed = vif->is_packed;
1055 1243040 : u16 n_vectors = frame->n_vectors;
1056 :
1057 1243040 : if (tf->shared_queue)
1058 0 : clib_spinlock_lock (&vring->lockp);
1059 :
1060 1243040 : if (vif->packet_coalesce)
1061 : {
1062 517686 : n_vectors = n_left =
1063 517686 : vnet_gro_inline (vm, vring->flow_table, buffers, n_left, to);
1064 517686 : buffers = to;
1065 517686 : virtio_txq_clear_scheduled (vring);
1066 : }
1067 :
1068 1243040 : u16 retry_count = 2;
1069 :
1070 1245470 : retry:
1071 : /* free consumed buffers */
1072 1245470 : virtio_free_used_device_desc (vm, vring, node->node_index, packed);
1073 :
1074 1245470 : if (vif->type == VIRTIO_IF_TYPE_TAP)
1075 1086710 : n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1076 : VIRTIO_IF_TYPE_TAP,
1077 1086710 : &buffers[n_vectors - n_left],
1078 : n_left, packed);
1079 158760 : else if (vif->type == VIRTIO_IF_TYPE_PCI)
1080 0 : n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1081 : VIRTIO_IF_TYPE_PCI,
1082 0 : &buffers[n_vectors - n_left],
1083 : n_left, packed);
1084 158760 : else if (vif->type == VIRTIO_IF_TYPE_TUN)
1085 158760 : n_left = virtio_interface_tx_inline (vm, node, vif, vring,
1086 : VIRTIO_IF_TYPE_TUN,
1087 158760 : &buffers[n_vectors - n_left],
1088 : n_left, packed);
1089 : else
1090 0 : ASSERT (0);
1091 :
1092 1245470 : if (n_left && retry_count--)
1093 2432 : goto retry;
1094 :
1095 1243040 : if (vif->packet_buffering && n_left)
1096 : {
1097 0 : u16 n_buffered = virtio_vring_buffering_store_packets (vring->buffering,
1098 : &buffers
1099 0 : [n_vectors
1100 0 : - n_left],
1101 : n_left);
1102 0 : n_left -= n_buffered;
1103 : }
1104 1243040 : if (n_left)
1105 757 : virtio_interface_drop_inline (vm, vif, node->node_index,
1106 757 : &buffers[n_vectors - n_left], n_left,
1107 : VIRTIO_TX_ERROR_NO_FREE_SLOTS);
1108 :
1109 1243040 : if (tf->shared_queue)
1110 0 : clib_spinlock_unlock (&vring->lockp);
1111 :
1112 1243040 : return frame->n_vectors - n_left;
1113 : }
1114 :
1115 : static void
1116 0 : virtio_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
1117 : u32 node_index)
1118 : {
1119 0 : virtio_main_t *apm = &virtio_main;
1120 0 : vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1121 0 : virtio_if_t *vif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
1122 :
1123 : /* Shut off redirection */
1124 0 : if (node_index == ~0)
1125 : {
1126 0 : vif->per_interface_next_index = node_index;
1127 0 : return;
1128 : }
1129 :
1130 0 : vif->per_interface_next_index =
1131 0 : vlib_node_add_next (vlib_get_main (), virtio_input_node.index,
1132 : node_index);
1133 : }
1134 :
1135 : static void
1136 0 : virtio_clear_hw_interface_counters (u32 instance)
1137 : {
1138 : /* Nothing for now */
1139 0 : }
1140 :
1141 : static void
1142 0 : virtio_set_rx_interrupt (virtio_if_t *vif, vnet_virtio_vring_t *vring)
1143 : {
1144 0 : if (vif->is_packed)
1145 0 : vring->driver_event->flags &= ~VRING_EVENT_F_DISABLE;
1146 : else
1147 0 : vring->avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT;
1148 0 : }
1149 :
1150 : static void
1151 0 : virtio_set_rx_polling (virtio_if_t *vif, vnet_virtio_vring_t *vring)
1152 : {
1153 0 : if (vif->is_packed)
1154 0 : vring->driver_event->flags |= VRING_EVENT_F_DISABLE;
1155 : else
1156 0 : vring->avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
1157 0 : }
1158 :
1159 : static clib_error_t *
1160 0 : virtio_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
1161 : vnet_hw_if_rx_mode mode)
1162 : {
1163 0 : virtio_main_t *mm = &virtio_main;
1164 0 : vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1165 0 : virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1166 0 : vnet_virtio_vring_t *rx_vring = vec_elt_at_index (vif->rxq_vrings, qid);
1167 :
1168 0 : if (vif->type == VIRTIO_IF_TYPE_PCI && !(vif->support_int_mode))
1169 : {
1170 0 : virtio_set_rx_polling (vif, rx_vring);
1171 0 : return clib_error_return (0, "interrupt mode is not supported");
1172 : }
1173 :
1174 0 : if (mode == VNET_HW_IF_RX_MODE_POLLING)
1175 0 : virtio_set_rx_polling (vif, rx_vring);
1176 : else
1177 0 : virtio_set_rx_interrupt (vif, rx_vring);
1178 :
1179 0 : rx_vring->mode = mode;
1180 :
1181 0 : return 0;
1182 : }
1183 :
1184 : static clib_error_t *
1185 600 : virtio_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
1186 : {
1187 600 : virtio_main_t *mm = &virtio_main;
1188 600 : vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
1189 600 : virtio_if_t *vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
1190 :
1191 600 : if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
1192 : {
1193 300 : vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
1194 300 : vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
1195 : VNET_HW_INTERFACE_FLAG_LINK_UP);
1196 : }
1197 : else
1198 : {
1199 300 : vif->flags &= ~VIRTIO_IF_FLAG_ADMIN_UP;
1200 300 : vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
1201 : }
1202 600 : return 0;
1203 : }
1204 :
1205 : static clib_error_t *
1206 0 : virtio_subif_add_del_function (vnet_main_t * vnm,
1207 : u32 hw_if_index,
1208 : struct vnet_sw_interface_t *st, int is_add)
1209 : {
1210 : /* Nothing for now */
1211 0 : return 0;
1212 : }
1213 :
1214 : /* *INDENT-OFF* */
1215 11199 : VNET_DEVICE_CLASS (virtio_device_class) = {
1216 : .name = "virtio",
1217 : .format_device_name = format_virtio_device_name,
1218 : .format_device = format_virtio_device,
1219 : .format_tx_trace = format_virtio_tx_trace,
1220 : .tx_function_n_errors = VIRTIO_TX_N_ERROR,
1221 : .tx_function_error_strings = virtio_tx_func_error_strings,
1222 : .rx_redirect_to_node = virtio_set_interface_next_node,
1223 : .clear_counters = virtio_clear_hw_interface_counters,
1224 : .admin_up_down_function = virtio_interface_admin_up_down,
1225 : .subif_add_del_function = virtio_subif_add_del_function,
1226 : .rx_mode_change_function = virtio_interface_rx_mode_change,
1227 : };
1228 :
1229 : /* *INDENT-ON* */
1230 :
1231 : /*
1232 : * fd.io coding-style-patch-verification: ON
1233 : *
1234 : * Local Variables:
1235 : * eval: (c-set-style "gnu")
1236 : * End:
1237 : */
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