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e263cd49 DF |
1 | /* |
2 | * QEMU VMWARE VMXNET* paravirtual NICs - TX packets abstractions | |
3 | * | |
4 | * Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com) | |
5 | * | |
6 | * Developed by Daynix Computing LTD (http://www.daynix.com) | |
7 | * | |
8 | * Authors: | |
9 | * Dmitry Fleytman <dmitry@daynix.com> | |
10 | * Tamir Shomer <tamirs@daynix.com> | |
11 | * Yan Vugenfirer <yan@daynix.com> | |
12 | * | |
13 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
14 | * See the COPYING file in the top-level directory. | |
15 | * | |
16 | */ | |
17 | ||
0bc3cd62 | 18 | #include "hw/hw.h" |
e263cd49 DF |
19 | #include "vmxnet_tx_pkt.h" |
20 | #include "net/eth.h" | |
21 | #include "qemu-common.h" | |
22 | #include "qemu/iov.h" | |
23 | #include "net/checksum.h" | |
24 | #include "net/tap.h" | |
25 | #include "net/net.h" | |
e263cd49 DF |
26 | |
27 | enum { | |
28 | VMXNET_TX_PKT_VHDR_FRAG = 0, | |
29 | VMXNET_TX_PKT_L2HDR_FRAG, | |
30 | VMXNET_TX_PKT_L3HDR_FRAG, | |
31 | VMXNET_TX_PKT_PL_START_FRAG | |
32 | }; | |
33 | ||
34 | /* TX packet private context */ | |
35 | struct VmxnetTxPkt { | |
36 | struct virtio_net_hdr virt_hdr; | |
37 | bool has_virt_hdr; | |
38 | ||
39 | struct iovec *raw; | |
40 | uint32_t raw_frags; | |
41 | uint32_t max_raw_frags; | |
42 | ||
43 | struct iovec *vec; | |
44 | ||
45 | uint8_t l2_hdr[ETH_MAX_L2_HDR_LEN]; | |
46 | ||
47 | uint32_t payload_len; | |
48 | ||
49 | uint32_t payload_frags; | |
50 | uint32_t max_payload_frags; | |
51 | ||
52 | uint16_t hdr_len; | |
53 | eth_pkt_types_e packet_type; | |
54 | uint8_t l4proto; | |
55 | }; | |
56 | ||
57 | void vmxnet_tx_pkt_init(struct VmxnetTxPkt **pkt, uint32_t max_frags, | |
58 | bool has_virt_hdr) | |
59 | { | |
60 | struct VmxnetTxPkt *p = g_malloc0(sizeof *p); | |
61 | ||
62 | p->vec = g_malloc((sizeof *p->vec) * | |
63 | (max_frags + VMXNET_TX_PKT_PL_START_FRAG)); | |
64 | ||
65 | p->raw = g_malloc((sizeof *p->raw) * max_frags); | |
66 | ||
67 | p->max_payload_frags = max_frags; | |
68 | p->max_raw_frags = max_frags; | |
69 | p->has_virt_hdr = has_virt_hdr; | |
70 | p->vec[VMXNET_TX_PKT_VHDR_FRAG].iov_base = &p->virt_hdr; | |
71 | p->vec[VMXNET_TX_PKT_VHDR_FRAG].iov_len = | |
72 | p->has_virt_hdr ? sizeof p->virt_hdr : 0; | |
73 | p->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_base = &p->l2_hdr; | |
74 | p->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_base = NULL; | |
75 | p->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len = 0; | |
76 | ||
77 | *pkt = p; | |
78 | } | |
79 | ||
80 | void vmxnet_tx_pkt_uninit(struct VmxnetTxPkt *pkt) | |
81 | { | |
82 | if (pkt) { | |
83 | g_free(pkt->vec); | |
84 | g_free(pkt->raw); | |
85 | g_free(pkt); | |
86 | } | |
87 | } | |
88 | ||
89 | void vmxnet_tx_pkt_update_ip_checksums(struct VmxnetTxPkt *pkt) | |
90 | { | |
91 | uint16_t csum; | |
92 | uint32_t ph_raw_csum; | |
93 | assert(pkt); | |
94 | uint8_t gso_type = pkt->virt_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN; | |
95 | struct ip_header *ip_hdr; | |
96 | ||
97 | if (VIRTIO_NET_HDR_GSO_TCPV4 != gso_type && | |
98 | VIRTIO_NET_HDR_GSO_UDP != gso_type) { | |
99 | return; | |
100 | } | |
101 | ||
102 | ip_hdr = pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_base; | |
103 | ||
104 | if (pkt->payload_len + pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len > | |
105 | ETH_MAX_IP_DGRAM_LEN) { | |
106 | return; | |
107 | } | |
108 | ||
109 | ip_hdr->ip_len = cpu_to_be16(pkt->payload_len + | |
110 | pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len); | |
111 | ||
112 | /* Calculate IP header checksum */ | |
113 | ip_hdr->ip_sum = 0; | |
114 | csum = net_raw_checksum((uint8_t *)ip_hdr, | |
115 | pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len); | |
116 | ip_hdr->ip_sum = cpu_to_be16(csum); | |
117 | ||
118 | /* Calculate IP pseudo header checksum */ | |
119 | ph_raw_csum = eth_calc_pseudo_hdr_csum(ip_hdr, pkt->payload_len); | |
120 | csum = cpu_to_be16(~net_checksum_finish(ph_raw_csum)); | |
121 | iov_from_buf(&pkt->vec[VMXNET_TX_PKT_PL_START_FRAG], pkt->payload_frags, | |
122 | pkt->virt_hdr.csum_offset, &csum, sizeof(csum)); | |
123 | } | |
124 | ||
125 | static void vmxnet_tx_pkt_calculate_hdr_len(struct VmxnetTxPkt *pkt) | |
126 | { | |
127 | pkt->hdr_len = pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_len + | |
128 | pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len; | |
129 | } | |
130 | ||
131 | static bool vmxnet_tx_pkt_parse_headers(struct VmxnetTxPkt *pkt) | |
132 | { | |
133 | struct iovec *l2_hdr, *l3_hdr; | |
134 | size_t bytes_read; | |
135 | size_t full_ip6hdr_len; | |
136 | uint16_t l3_proto; | |
137 | ||
138 | assert(pkt); | |
139 | ||
140 | l2_hdr = &pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG]; | |
141 | l3_hdr = &pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG]; | |
142 | ||
143 | bytes_read = iov_to_buf(pkt->raw, pkt->raw_frags, 0, l2_hdr->iov_base, | |
144 | ETH_MAX_L2_HDR_LEN); | |
145 | if (bytes_read < ETH_MAX_L2_HDR_LEN) { | |
146 | l2_hdr->iov_len = 0; | |
147 | return false; | |
148 | } else { | |
149 | l2_hdr->iov_len = eth_get_l2_hdr_length(l2_hdr->iov_base); | |
150 | } | |
151 | ||
152 | l3_proto = eth_get_l3_proto(l2_hdr->iov_base, l2_hdr->iov_len); | |
153 | ||
154 | switch (l3_proto) { | |
155 | case ETH_P_IP: | |
156 | l3_hdr->iov_base = g_malloc(ETH_MAX_IP4_HDR_LEN); | |
157 | ||
158 | bytes_read = iov_to_buf(pkt->raw, pkt->raw_frags, l2_hdr->iov_len, | |
159 | l3_hdr->iov_base, sizeof(struct ip_header)); | |
160 | ||
161 | if (bytes_read < sizeof(struct ip_header)) { | |
162 | l3_hdr->iov_len = 0; | |
163 | return false; | |
164 | } | |
165 | ||
166 | l3_hdr->iov_len = IP_HDR_GET_LEN(l3_hdr->iov_base); | |
167 | pkt->l4proto = ((struct ip_header *) l3_hdr->iov_base)->ip_p; | |
168 | ||
169 | /* copy optional IPv4 header data */ | |
170 | bytes_read = iov_to_buf(pkt->raw, pkt->raw_frags, | |
171 | l2_hdr->iov_len + sizeof(struct ip_header), | |
172 | l3_hdr->iov_base + sizeof(struct ip_header), | |
173 | l3_hdr->iov_len - sizeof(struct ip_header)); | |
174 | if (bytes_read < l3_hdr->iov_len - sizeof(struct ip_header)) { | |
175 | l3_hdr->iov_len = 0; | |
176 | return false; | |
177 | } | |
178 | break; | |
179 | ||
180 | case ETH_P_IPV6: | |
181 | if (!eth_parse_ipv6_hdr(pkt->raw, pkt->raw_frags, l2_hdr->iov_len, | |
182 | &pkt->l4proto, &full_ip6hdr_len)) { | |
183 | l3_hdr->iov_len = 0; | |
184 | return false; | |
185 | } | |
186 | ||
187 | l3_hdr->iov_base = g_malloc(full_ip6hdr_len); | |
188 | ||
189 | bytes_read = iov_to_buf(pkt->raw, pkt->raw_frags, l2_hdr->iov_len, | |
190 | l3_hdr->iov_base, full_ip6hdr_len); | |
191 | ||
192 | if (bytes_read < full_ip6hdr_len) { | |
193 | l3_hdr->iov_len = 0; | |
194 | return false; | |
195 | } else { | |
196 | l3_hdr->iov_len = full_ip6hdr_len; | |
197 | } | |
198 | break; | |
199 | ||
200 | default: | |
201 | l3_hdr->iov_len = 0; | |
202 | break; | |
203 | } | |
204 | ||
205 | vmxnet_tx_pkt_calculate_hdr_len(pkt); | |
206 | pkt->packet_type = get_eth_packet_type(l2_hdr->iov_base); | |
207 | return true; | |
208 | } | |
209 | ||
210 | static bool vmxnet_tx_pkt_rebuild_payload(struct VmxnetTxPkt *pkt) | |
211 | { | |
212 | size_t payload_len = iov_size(pkt->raw, pkt->raw_frags) - pkt->hdr_len; | |
213 | ||
214 | pkt->payload_frags = iov_copy(&pkt->vec[VMXNET_TX_PKT_PL_START_FRAG], | |
215 | pkt->max_payload_frags, | |
216 | pkt->raw, pkt->raw_frags, | |
217 | pkt->hdr_len, payload_len); | |
218 | ||
219 | if (pkt->payload_frags != (uint32_t) -1) { | |
220 | pkt->payload_len = payload_len; | |
221 | return true; | |
222 | } else { | |
223 | return false; | |
224 | } | |
225 | } | |
226 | ||
227 | bool vmxnet_tx_pkt_parse(struct VmxnetTxPkt *pkt) | |
228 | { | |
229 | return vmxnet_tx_pkt_parse_headers(pkt) && | |
230 | vmxnet_tx_pkt_rebuild_payload(pkt); | |
231 | } | |
232 | ||
233 | struct virtio_net_hdr *vmxnet_tx_pkt_get_vhdr(struct VmxnetTxPkt *pkt) | |
234 | { | |
235 | assert(pkt); | |
236 | return &pkt->virt_hdr; | |
237 | } | |
238 | ||
239 | static uint8_t vmxnet_tx_pkt_get_gso_type(struct VmxnetTxPkt *pkt, | |
240 | bool tso_enable) | |
241 | { | |
242 | uint8_t rc = VIRTIO_NET_HDR_GSO_NONE; | |
243 | uint16_t l3_proto; | |
244 | ||
245 | l3_proto = eth_get_l3_proto(pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_base, | |
246 | pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_len); | |
247 | ||
248 | if (!tso_enable) { | |
249 | goto func_exit; | |
250 | } | |
251 | ||
252 | rc = eth_get_gso_type(l3_proto, pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_base, | |
253 | pkt->l4proto); | |
254 | ||
255 | func_exit: | |
256 | return rc; | |
257 | } | |
258 | ||
259 | void vmxnet_tx_pkt_build_vheader(struct VmxnetTxPkt *pkt, bool tso_enable, | |
260 | bool csum_enable, uint32_t gso_size) | |
261 | { | |
262 | struct tcp_hdr l4hdr; | |
263 | assert(pkt); | |
264 | ||
265 | /* csum has to be enabled if tso is. */ | |
266 | assert(csum_enable || !tso_enable); | |
267 | ||
268 | pkt->virt_hdr.gso_type = vmxnet_tx_pkt_get_gso_type(pkt, tso_enable); | |
269 | ||
270 | switch (pkt->virt_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
271 | case VIRTIO_NET_HDR_GSO_NONE: | |
272 | pkt->virt_hdr.hdr_len = 0; | |
273 | pkt->virt_hdr.gso_size = 0; | |
274 | break; | |
275 | ||
276 | case VIRTIO_NET_HDR_GSO_UDP: | |
277 | pkt->virt_hdr.gso_size = IP_FRAG_ALIGN_SIZE(gso_size); | |
278 | pkt->virt_hdr.hdr_len = pkt->hdr_len + sizeof(struct udp_header); | |
279 | break; | |
280 | ||
281 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
282 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
283 | iov_to_buf(&pkt->vec[VMXNET_TX_PKT_PL_START_FRAG], pkt->payload_frags, | |
284 | 0, &l4hdr, sizeof(l4hdr)); | |
285 | pkt->virt_hdr.hdr_len = pkt->hdr_len + l4hdr.th_off * sizeof(uint32_t); | |
286 | pkt->virt_hdr.gso_size = IP_FRAG_ALIGN_SIZE(gso_size); | |
287 | break; | |
288 | ||
289 | default: | |
dfc6f865 | 290 | g_assert_not_reached(); |
e263cd49 DF |
291 | } |
292 | ||
293 | if (csum_enable) { | |
294 | switch (pkt->l4proto) { | |
295 | case IP_PROTO_TCP: | |
296 | pkt->virt_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
297 | pkt->virt_hdr.csum_start = pkt->hdr_len; | |
298 | pkt->virt_hdr.csum_offset = offsetof(struct tcp_hdr, th_sum); | |
299 | break; | |
300 | case IP_PROTO_UDP: | |
301 | pkt->virt_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
302 | pkt->virt_hdr.csum_start = pkt->hdr_len; | |
303 | pkt->virt_hdr.csum_offset = offsetof(struct udp_hdr, uh_sum); | |
304 | break; | |
305 | default: | |
306 | break; | |
307 | } | |
308 | } | |
309 | } | |
310 | ||
311 | void vmxnet_tx_pkt_setup_vlan_header(struct VmxnetTxPkt *pkt, uint16_t vlan) | |
312 | { | |
313 | bool is_new; | |
314 | assert(pkt); | |
315 | ||
316 | eth_setup_vlan_headers(pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_base, | |
317 | vlan, &is_new); | |
318 | ||
319 | /* update l2hdrlen */ | |
320 | if (is_new) { | |
321 | pkt->hdr_len += sizeof(struct vlan_header); | |
322 | pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_len += | |
323 | sizeof(struct vlan_header); | |
324 | } | |
325 | } | |
326 | ||
327 | bool vmxnet_tx_pkt_add_raw_fragment(struct VmxnetTxPkt *pkt, hwaddr pa, | |
328 | size_t len) | |
329 | { | |
330 | hwaddr mapped_len = 0; | |
331 | struct iovec *ventry; | |
332 | assert(pkt); | |
333 | assert(pkt->max_raw_frags > pkt->raw_frags); | |
334 | ||
335 | if (!len) { | |
336 | return true; | |
337 | } | |
338 | ||
339 | ventry = &pkt->raw[pkt->raw_frags]; | |
340 | mapped_len = len; | |
341 | ||
342 | ventry->iov_base = cpu_physical_memory_map(pa, &mapped_len, false); | |
343 | ventry->iov_len = mapped_len; | |
344 | pkt->raw_frags += !!ventry->iov_base; | |
345 | ||
346 | if ((ventry->iov_base == NULL) || (len != mapped_len)) { | |
347 | return false; | |
348 | } | |
349 | ||
350 | return true; | |
351 | } | |
352 | ||
353 | eth_pkt_types_e vmxnet_tx_pkt_get_packet_type(struct VmxnetTxPkt *pkt) | |
354 | { | |
355 | assert(pkt); | |
356 | ||
357 | return pkt->packet_type; | |
358 | } | |
359 | ||
360 | size_t vmxnet_tx_pkt_get_total_len(struct VmxnetTxPkt *pkt) | |
361 | { | |
362 | assert(pkt); | |
363 | ||
364 | return pkt->hdr_len + pkt->payload_len; | |
365 | } | |
366 | ||
367 | void vmxnet_tx_pkt_dump(struct VmxnetTxPkt *pkt) | |
368 | { | |
369 | #ifdef VMXNET_TX_PKT_DEBUG | |
370 | assert(pkt); | |
371 | ||
372 | printf("TX PKT: hdr_len: %d, pkt_type: 0x%X, l2hdr_len: %lu, " | |
373 | "l3hdr_len: %lu, payload_len: %u\n", pkt->hdr_len, pkt->packet_type, | |
374 | pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_len, | |
375 | pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len, pkt->payload_len); | |
376 | #endif | |
377 | } | |
378 | ||
379 | void vmxnet_tx_pkt_reset(struct VmxnetTxPkt *pkt) | |
380 | { | |
381 | int i; | |
382 | ||
383 | /* no assert, as reset can be called before tx_pkt_init */ | |
384 | if (!pkt) { | |
385 | return; | |
386 | } | |
387 | ||
388 | memset(&pkt->virt_hdr, 0, sizeof(pkt->virt_hdr)); | |
389 | ||
390 | g_free(pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_base); | |
391 | pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_base = NULL; | |
392 | ||
393 | assert(pkt->vec); | |
394 | for (i = VMXNET_TX_PKT_L2HDR_FRAG; | |
395 | i < pkt->payload_frags + VMXNET_TX_PKT_PL_START_FRAG; i++) { | |
396 | pkt->vec[i].iov_len = 0; | |
397 | } | |
398 | pkt->payload_len = 0; | |
399 | pkt->payload_frags = 0; | |
400 | ||
401 | assert(pkt->raw); | |
402 | for (i = 0; i < pkt->raw_frags; i++) { | |
403 | assert(pkt->raw[i].iov_base); | |
404 | cpu_physical_memory_unmap(pkt->raw[i].iov_base, pkt->raw[i].iov_len, | |
405 | false, pkt->raw[i].iov_len); | |
406 | pkt->raw[i].iov_len = 0; | |
407 | } | |
408 | pkt->raw_frags = 0; | |
409 | ||
410 | pkt->hdr_len = 0; | |
411 | pkt->packet_type = 0; | |
412 | pkt->l4proto = 0; | |
413 | } | |
414 | ||
415 | static void vmxnet_tx_pkt_do_sw_csum(struct VmxnetTxPkt *pkt) | |
416 | { | |
417 | struct iovec *iov = &pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG]; | |
418 | uint32_t csum_cntr; | |
419 | uint16_t csum = 0; | |
420 | /* num of iovec without vhdr */ | |
421 | uint32_t iov_len = pkt->payload_frags + VMXNET_TX_PKT_PL_START_FRAG - 1; | |
422 | uint16_t csl; | |
423 | struct ip_header *iphdr; | |
424 | size_t csum_offset = pkt->virt_hdr.csum_start + pkt->virt_hdr.csum_offset; | |
425 | ||
426 | /* Put zero to checksum field */ | |
427 | iov_from_buf(iov, iov_len, csum_offset, &csum, sizeof csum); | |
428 | ||
429 | /* Calculate L4 TCP/UDP checksum */ | |
430 | csl = pkt->payload_len; | |
431 | ||
432 | /* data checksum */ | |
433 | csum_cntr = | |
434 | net_checksum_add_iov(iov, iov_len, pkt->virt_hdr.csum_start, csl); | |
435 | /* add pseudo header to csum */ | |
436 | iphdr = pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_base; | |
437 | csum_cntr += eth_calc_pseudo_hdr_csum(iphdr, csl); | |
438 | ||
439 | /* Put the checksum obtained into the packet */ | |
440 | csum = cpu_to_be16(net_checksum_finish(csum_cntr)); | |
441 | iov_from_buf(iov, iov_len, csum_offset, &csum, sizeof csum); | |
442 | } | |
443 | ||
444 | enum { | |
445 | VMXNET_TX_PKT_FRAGMENT_L2_HDR_POS = 0, | |
446 | VMXNET_TX_PKT_FRAGMENT_L3_HDR_POS, | |
447 | VMXNET_TX_PKT_FRAGMENT_HEADER_NUM | |
448 | }; | |
449 | ||
450 | #define VMXNET_MAX_FRAG_SG_LIST (64) | |
451 | ||
452 | static size_t vmxnet_tx_pkt_fetch_fragment(struct VmxnetTxPkt *pkt, | |
453 | int *src_idx, size_t *src_offset, struct iovec *dst, int *dst_idx) | |
454 | { | |
455 | size_t fetched = 0; | |
456 | struct iovec *src = pkt->vec; | |
457 | ||
458 | *dst_idx = VMXNET_TX_PKT_FRAGMENT_HEADER_NUM; | |
459 | ||
460 | while (fetched < pkt->virt_hdr.gso_size) { | |
461 | ||
462 | /* no more place in fragment iov */ | |
463 | if (*dst_idx == VMXNET_MAX_FRAG_SG_LIST) { | |
464 | break; | |
465 | } | |
466 | ||
467 | /* no more data in iovec */ | |
468 | if (*src_idx == (pkt->payload_frags + VMXNET_TX_PKT_PL_START_FRAG)) { | |
469 | break; | |
470 | } | |
471 | ||
472 | ||
473 | dst[*dst_idx].iov_base = src[*src_idx].iov_base + *src_offset; | |
474 | dst[*dst_idx].iov_len = MIN(src[*src_idx].iov_len - *src_offset, | |
475 | pkt->virt_hdr.gso_size - fetched); | |
476 | ||
477 | *src_offset += dst[*dst_idx].iov_len; | |
478 | fetched += dst[*dst_idx].iov_len; | |
479 | ||
480 | if (*src_offset == src[*src_idx].iov_len) { | |
481 | *src_offset = 0; | |
482 | (*src_idx)++; | |
483 | } | |
484 | ||
485 | (*dst_idx)++; | |
486 | } | |
487 | ||
488 | return fetched; | |
489 | } | |
490 | ||
491 | static bool vmxnet_tx_pkt_do_sw_fragmentation(struct VmxnetTxPkt *pkt, | |
492 | NetClientState *nc) | |
493 | { | |
494 | struct iovec fragment[VMXNET_MAX_FRAG_SG_LIST]; | |
495 | size_t fragment_len = 0; | |
496 | bool more_frags = false; | |
497 | ||
498 | /* some pointers for shorter code */ | |
499 | void *l2_iov_base, *l3_iov_base; | |
500 | size_t l2_iov_len, l3_iov_len; | |
501 | int src_idx = VMXNET_TX_PKT_PL_START_FRAG, dst_idx; | |
502 | size_t src_offset = 0; | |
503 | size_t fragment_offset = 0; | |
504 | ||
505 | l2_iov_base = pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_base; | |
506 | l2_iov_len = pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG].iov_len; | |
507 | l3_iov_base = pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_base; | |
508 | l3_iov_len = pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len; | |
509 | ||
510 | /* Copy headers */ | |
511 | fragment[VMXNET_TX_PKT_FRAGMENT_L2_HDR_POS].iov_base = l2_iov_base; | |
512 | fragment[VMXNET_TX_PKT_FRAGMENT_L2_HDR_POS].iov_len = l2_iov_len; | |
513 | fragment[VMXNET_TX_PKT_FRAGMENT_L3_HDR_POS].iov_base = l3_iov_base; | |
514 | fragment[VMXNET_TX_PKT_FRAGMENT_L3_HDR_POS].iov_len = l3_iov_len; | |
515 | ||
516 | ||
517 | /* Put as much data as possible and send */ | |
518 | do { | |
519 | fragment_len = vmxnet_tx_pkt_fetch_fragment(pkt, &src_idx, &src_offset, | |
520 | fragment, &dst_idx); | |
521 | ||
522 | more_frags = (fragment_offset + fragment_len < pkt->payload_len); | |
523 | ||
524 | eth_setup_ip4_fragmentation(l2_iov_base, l2_iov_len, l3_iov_base, | |
525 | l3_iov_len, fragment_len, fragment_offset, more_frags); | |
526 | ||
527 | eth_fix_ip4_checksum(l3_iov_base, l3_iov_len); | |
528 | ||
529 | qemu_sendv_packet(nc, fragment, dst_idx); | |
530 | ||
531 | fragment_offset += fragment_len; | |
532 | ||
533 | } while (more_frags); | |
534 | ||
535 | return true; | |
536 | } | |
537 | ||
538 | bool vmxnet_tx_pkt_send(struct VmxnetTxPkt *pkt, NetClientState *nc) | |
539 | { | |
540 | assert(pkt); | |
541 | ||
542 | if (!pkt->has_virt_hdr && | |
543 | pkt->virt_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
544 | vmxnet_tx_pkt_do_sw_csum(pkt); | |
545 | } | |
546 | ||
547 | /* | |
548 | * Since underlying infrastructure does not support IP datagrams longer | |
549 | * than 64K we should drop such packets and don't even try to send | |
550 | */ | |
551 | if (VIRTIO_NET_HDR_GSO_NONE != pkt->virt_hdr.gso_type) { | |
552 | if (pkt->payload_len > | |
553 | ETH_MAX_IP_DGRAM_LEN - | |
554 | pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len) { | |
555 | return false; | |
556 | } | |
557 | } | |
558 | ||
559 | if (pkt->has_virt_hdr || | |
560 | pkt->virt_hdr.gso_type == VIRTIO_NET_HDR_GSO_NONE) { | |
561 | qemu_sendv_packet(nc, pkt->vec, | |
562 | pkt->payload_frags + VMXNET_TX_PKT_PL_START_FRAG); | |
563 | return true; | |
564 | } | |
565 | ||
566 | return vmxnet_tx_pkt_do_sw_fragmentation(pkt, nc); | |
567 | } |