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e613b064 AL |
1 | /* |
2 | * xen paravirt network card backend | |
3 | * | |
4 | * (c) Gerd Hoffmann <kraxel@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; under version 2 of the License. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
8167ee88 | 16 | * with this program; if not, see <http://www.gnu.org/licenses/>. |
6b620ca3 PB |
17 | * |
18 | * Contributions after 2012-01-13 are licensed under the terms of the | |
19 | * GNU GPL, version 2 or (at your option) any later version. | |
e613b064 AL |
20 | */ |
21 | ||
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <stdarg.h> | |
25 | #include <string.h> | |
26 | #include <unistd.h> | |
e613b064 AL |
27 | #include <inttypes.h> |
28 | #include <fcntl.h> | |
29 | #include <errno.h> | |
e613b064 AL |
30 | #include <sys/socket.h> |
31 | #include <sys/ioctl.h> | |
32 | #include <sys/types.h> | |
33 | #include <sys/stat.h> | |
34 | #include <sys/mman.h> | |
35 | #include <sys/wait.h> | |
e613b064 | 36 | |
83c9f4ca | 37 | #include "hw/hw.h" |
1422e32d | 38 | #include "net/net.h" |
7200ac3c | 39 | #include "net/checksum.h" |
658788c5 | 40 | #include "net/util.h" |
0d09e41a | 41 | #include "hw/xen/xen_backend.h" |
e613b064 | 42 | |
b41f6719 AP |
43 | #include <xen/io/netif.h> |
44 | ||
e613b064 AL |
45 | /* ------------------------------------------------------------- */ |
46 | ||
47 | struct XenNetDev { | |
48 | struct XenDevice xendev; /* must be first */ | |
49 | char *mac; | |
50 | int tx_work; | |
51 | int tx_ring_ref; | |
52 | int rx_ring_ref; | |
53 | struct netif_tx_sring *txs; | |
54 | struct netif_rx_sring *rxs; | |
55 | netif_tx_back_ring_t tx_ring; | |
56 | netif_rx_back_ring_t rx_ring; | |
658788c5 MM |
57 | NICConf conf; |
58 | NICState *nic; | |
e613b064 AL |
59 | }; |
60 | ||
61 | /* ------------------------------------------------------------- */ | |
62 | ||
63 | static void net_tx_response(struct XenNetDev *netdev, netif_tx_request_t *txp, int8_t st) | |
64 | { | |
65 | RING_IDX i = netdev->tx_ring.rsp_prod_pvt; | |
66 | netif_tx_response_t *resp; | |
67 | int notify; | |
68 | ||
69 | resp = RING_GET_RESPONSE(&netdev->tx_ring, i); | |
70 | resp->id = txp->id; | |
71 | resp->status = st; | |
72 | ||
73 | #if 0 | |
209cd7ab AP |
74 | if (txp->flags & NETTXF_extra_info) { |
75 | RING_GET_RESPONSE(&netdev->tx_ring, ++i)->status = NETIF_RSP_NULL; | |
76 | } | |
e613b064 AL |
77 | #endif |
78 | ||
79 | netdev->tx_ring.rsp_prod_pvt = ++i; | |
80 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->tx_ring, notify); | |
209cd7ab AP |
81 | if (notify) { |
82 | xen_be_send_notify(&netdev->xendev); | |
83 | } | |
e613b064 AL |
84 | |
85 | if (i == netdev->tx_ring.req_cons) { | |
209cd7ab AP |
86 | int more_to_do; |
87 | RING_FINAL_CHECK_FOR_REQUESTS(&netdev->tx_ring, more_to_do); | |
88 | if (more_to_do) { | |
89 | netdev->tx_work++; | |
90 | } | |
e613b064 AL |
91 | } |
92 | } | |
93 | ||
94 | static void net_tx_error(struct XenNetDev *netdev, netif_tx_request_t *txp, RING_IDX end) | |
95 | { | |
96 | #if 0 | |
97 | /* | |
98 | * Hmm, why netback fails everything in the ring? | |
99 | * Should we do that even when not supporting SG and TSO? | |
100 | */ | |
101 | RING_IDX cons = netdev->tx_ring.req_cons; | |
102 | ||
103 | do { | |
209cd7ab AP |
104 | make_tx_response(netif, txp, NETIF_RSP_ERROR); |
105 | if (cons >= end) { | |
106 | break; | |
107 | } | |
108 | txp = RING_GET_REQUEST(&netdev->tx_ring, cons++); | |
e613b064 AL |
109 | } while (1); |
110 | netdev->tx_ring.req_cons = cons; | |
111 | netif_schedule_work(netif); | |
112 | netif_put(netif); | |
113 | #else | |
114 | net_tx_response(netdev, txp, NETIF_RSP_ERROR); | |
115 | #endif | |
116 | } | |
117 | ||
118 | static void net_tx_packets(struct XenNetDev *netdev) | |
119 | { | |
120 | netif_tx_request_t txreq; | |
121 | RING_IDX rc, rp; | |
122 | void *page; | |
123 | void *tmpbuf = NULL; | |
124 | ||
125 | for (;;) { | |
209cd7ab AP |
126 | rc = netdev->tx_ring.req_cons; |
127 | rp = netdev->tx_ring.sring->req_prod; | |
128 | xen_rmb(); /* Ensure we see queued requests up to 'rp'. */ | |
e613b064 | 129 | |
209cd7ab AP |
130 | while ((rc != rp)) { |
131 | if (RING_REQUEST_CONS_OVERFLOW(&netdev->tx_ring, rc)) { | |
132 | break; | |
133 | } | |
134 | memcpy(&txreq, RING_GET_REQUEST(&netdev->tx_ring, rc), sizeof(txreq)); | |
135 | netdev->tx_ring.req_cons = ++rc; | |
e613b064 AL |
136 | |
137 | #if 1 | |
209cd7ab AP |
138 | /* should not happen in theory, we don't announce the * |
139 | * feature-{sg,gso,whatelse} flags in xenstore (yet?) */ | |
140 | if (txreq.flags & NETTXF_extra_info) { | |
141 | xen_be_printf(&netdev->xendev, 0, "FIXME: extra info flag\n"); | |
142 | net_tx_error(netdev, &txreq, rc); | |
143 | continue; | |
144 | } | |
145 | if (txreq.flags & NETTXF_more_data) { | |
146 | xen_be_printf(&netdev->xendev, 0, "FIXME: more data flag\n"); | |
147 | net_tx_error(netdev, &txreq, rc); | |
148 | continue; | |
149 | } | |
e613b064 AL |
150 | #endif |
151 | ||
209cd7ab AP |
152 | if (txreq.size < 14) { |
153 | xen_be_printf(&netdev->xendev, 0, "bad packet size: %d\n", txreq.size); | |
154 | net_tx_error(netdev, &txreq, rc); | |
155 | continue; | |
156 | } | |
157 | ||
158 | if ((txreq.offset + txreq.size) > XC_PAGE_SIZE) { | |
159 | xen_be_printf(&netdev->xendev, 0, "error: page crossing\n"); | |
160 | net_tx_error(netdev, &txreq, rc); | |
161 | continue; | |
162 | } | |
163 | ||
164 | xen_be_printf(&netdev->xendev, 3, "tx packet ref %d, off %d, len %d, flags 0x%x%s%s%s%s\n", | |
165 | txreq.gref, txreq.offset, txreq.size, txreq.flags, | |
166 | (txreq.flags & NETTXF_csum_blank) ? " csum_blank" : "", | |
167 | (txreq.flags & NETTXF_data_validated) ? " data_validated" : "", | |
168 | (txreq.flags & NETTXF_more_data) ? " more_data" : "", | |
169 | (txreq.flags & NETTXF_extra_info) ? " extra_info" : ""); | |
170 | ||
171 | page = xc_gnttab_map_grant_ref(netdev->xendev.gnttabdev, | |
172 | netdev->xendev.dom, | |
173 | txreq.gref, PROT_READ); | |
174 | if (page == NULL) { | |
175 | xen_be_printf(&netdev->xendev, 0, "error: tx gref dereference failed (%d)\n", | |
e613b064 | 176 | txreq.gref); |
209cd7ab AP |
177 | net_tx_error(netdev, &txreq, rc); |
178 | continue; | |
179 | } | |
180 | if (txreq.flags & NETTXF_csum_blank) { | |
e613b064 | 181 | /* have read-only mapping -> can't fill checksum in-place */ |
209cd7ab | 182 | if (!tmpbuf) { |
7267c094 | 183 | tmpbuf = g_malloc(XC_PAGE_SIZE); |
209cd7ab | 184 | } |
e613b064 | 185 | memcpy(tmpbuf, page + txreq.offset, txreq.size); |
209cd7ab | 186 | net_checksum_calculate(tmpbuf, txreq.size); |
b356f76d JW |
187 | qemu_send_packet(qemu_get_queue(netdev->nic), tmpbuf, |
188 | txreq.size); | |
e613b064 | 189 | } else { |
b356f76d JW |
190 | qemu_send_packet(qemu_get_queue(netdev->nic), |
191 | page + txreq.offset, txreq.size); | |
e613b064 | 192 | } |
209cd7ab AP |
193 | xc_gnttab_munmap(netdev->xendev.gnttabdev, page, 1); |
194 | net_tx_response(netdev, &txreq, NETIF_RSP_OKAY); | |
195 | } | |
196 | if (!netdev->tx_work) { | |
197 | break; | |
198 | } | |
199 | netdev->tx_work = 0; | |
e613b064 | 200 | } |
7267c094 | 201 | g_free(tmpbuf); |
e613b064 AL |
202 | } |
203 | ||
204 | /* ------------------------------------------------------------- */ | |
205 | ||
206 | static void net_rx_response(struct XenNetDev *netdev, | |
209cd7ab AP |
207 | netif_rx_request_t *req, int8_t st, |
208 | uint16_t offset, uint16_t size, | |
209 | uint16_t flags) | |
e613b064 AL |
210 | { |
211 | RING_IDX i = netdev->rx_ring.rsp_prod_pvt; | |
212 | netif_rx_response_t *resp; | |
213 | int notify; | |
214 | ||
215 | resp = RING_GET_RESPONSE(&netdev->rx_ring, i); | |
216 | resp->offset = offset; | |
217 | resp->flags = flags; | |
218 | resp->id = req->id; | |
219 | resp->status = (int16_t)size; | |
209cd7ab AP |
220 | if (st < 0) { |
221 | resp->status = (int16_t)st; | |
222 | } | |
e613b064 AL |
223 | |
224 | xen_be_printf(&netdev->xendev, 3, "rx response: idx %d, status %d, flags 0x%x\n", | |
209cd7ab | 225 | i, resp->status, resp->flags); |
e613b064 AL |
226 | |
227 | netdev->rx_ring.rsp_prod_pvt = ++i; | |
228 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->rx_ring, notify); | |
209cd7ab AP |
229 | if (notify) { |
230 | xen_be_send_notify(&netdev->xendev); | |
231 | } | |
e613b064 AL |
232 | } |
233 | ||
234 | #define NET_IP_ALIGN 2 | |
235 | ||
4e68f7a0 | 236 | static ssize_t net_rx_packet(NetClientState *nc, const uint8_t *buf, size_t size) |
e613b064 | 237 | { |
cc1f0f45 | 238 | struct XenNetDev *netdev = qemu_get_nic_opaque(nc); |
e613b064 AL |
239 | netif_rx_request_t rxreq; |
240 | RING_IDX rc, rp; | |
241 | void *page; | |
242 | ||
209cd7ab AP |
243 | if (netdev->xendev.be_state != XenbusStateConnected) { |
244 | return -1; | |
245 | } | |
e613b064 AL |
246 | |
247 | rc = netdev->rx_ring.req_cons; | |
248 | rp = netdev->rx_ring.sring->req_prod; | |
249 | xen_rmb(); /* Ensure we see queued requests up to 'rp'. */ | |
250 | ||
251 | if (rc == rp || RING_REQUEST_CONS_OVERFLOW(&netdev->rx_ring, rc)) { | |
7bba83bf | 252 | return 0; |
e613b064 AL |
253 | } |
254 | if (size > XC_PAGE_SIZE - NET_IP_ALIGN) { | |
209cd7ab AP |
255 | xen_be_printf(&netdev->xendev, 0, "packet too big (%lu > %ld)", |
256 | (unsigned long)size, XC_PAGE_SIZE - NET_IP_ALIGN); | |
257 | return -1; | |
e613b064 AL |
258 | } |
259 | ||
260 | memcpy(&rxreq, RING_GET_REQUEST(&netdev->rx_ring, rc), sizeof(rxreq)); | |
261 | netdev->rx_ring.req_cons = ++rc; | |
262 | ||
263 | page = xc_gnttab_map_grant_ref(netdev->xendev.gnttabdev, | |
209cd7ab AP |
264 | netdev->xendev.dom, |
265 | rxreq.gref, PROT_WRITE); | |
e613b064 | 266 | if (page == NULL) { |
209cd7ab | 267 | xen_be_printf(&netdev->xendev, 0, "error: rx gref dereference failed (%d)\n", |
e613b064 | 268 | rxreq.gref); |
209cd7ab AP |
269 | net_rx_response(netdev, &rxreq, NETIF_RSP_ERROR, 0, 0, 0); |
270 | return -1; | |
e613b064 AL |
271 | } |
272 | memcpy(page + NET_IP_ALIGN, buf, size); | |
273 | xc_gnttab_munmap(netdev->xendev.gnttabdev, page, 1); | |
274 | net_rx_response(netdev, &rxreq, NETIF_RSP_OKAY, NET_IP_ALIGN, size, 0); | |
4f1c942b MM |
275 | |
276 | return size; | |
e613b064 AL |
277 | } |
278 | ||
279 | /* ------------------------------------------------------------- */ | |
280 | ||
658788c5 | 281 | static NetClientInfo net_xen_info = { |
2be64a68 | 282 | .type = NET_CLIENT_OPTIONS_KIND_NIC, |
658788c5 | 283 | .size = sizeof(NICState), |
658788c5 MM |
284 | .receive = net_rx_packet, |
285 | }; | |
286 | ||
e613b064 AL |
287 | static int net_init(struct XenDevice *xendev) |
288 | { | |
289 | struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev); | |
e613b064 AL |
290 | |
291 | /* read xenstore entries */ | |
209cd7ab AP |
292 | if (netdev->mac == NULL) { |
293 | netdev->mac = xenstore_read_be_str(&netdev->xendev, "mac"); | |
294 | } | |
e613b064 AL |
295 | |
296 | /* do we have all we need? */ | |
209cd7ab AP |
297 | if (netdev->mac == NULL) { |
298 | return -1; | |
299 | } | |
e613b064 | 300 | |
209cd7ab | 301 | if (net_parse_macaddr(netdev->conf.macaddr.a, netdev->mac) < 0) { |
658788c5 | 302 | return -1; |
209cd7ab | 303 | } |
658788c5 | 304 | |
658788c5 MM |
305 | netdev->nic = qemu_new_nic(&net_xen_info, &netdev->conf, |
306 | "xen", NULL, netdev); | |
307 | ||
b356f76d JW |
308 | snprintf(qemu_get_queue(netdev->nic)->info_str, |
309 | sizeof(qemu_get_queue(netdev->nic)->info_str), | |
e613b064 AL |
310 | "nic: xenbus vif macaddr=%s", netdev->mac); |
311 | ||
312 | /* fill info */ | |
313 | xenstore_write_be_int(&netdev->xendev, "feature-rx-copy", 1); | |
314 | xenstore_write_be_int(&netdev->xendev, "feature-rx-flip", 0); | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | static int net_connect(struct XenDevice *xendev) | |
320 | { | |
321 | struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev); | |
322 | int rx_copy; | |
323 | ||
324 | if (xenstore_read_fe_int(&netdev->xendev, "tx-ring-ref", | |
209cd7ab AP |
325 | &netdev->tx_ring_ref) == -1) { |
326 | return -1; | |
327 | } | |
e613b064 | 328 | if (xenstore_read_fe_int(&netdev->xendev, "rx-ring-ref", |
209cd7ab AP |
329 | &netdev->rx_ring_ref) == -1) { |
330 | return 1; | |
331 | } | |
e613b064 | 332 | if (xenstore_read_fe_int(&netdev->xendev, "event-channel", |
209cd7ab AP |
333 | &netdev->xendev.remote_port) == -1) { |
334 | return -1; | |
335 | } | |
e613b064 | 336 | |
209cd7ab AP |
337 | if (xenstore_read_fe_int(&netdev->xendev, "request-rx-copy", &rx_copy) == -1) { |
338 | rx_copy = 0; | |
339 | } | |
e613b064 | 340 | if (rx_copy == 0) { |
209cd7ab AP |
341 | xen_be_printf(&netdev->xendev, 0, "frontend doesn't support rx-copy.\n"); |
342 | return -1; | |
e613b064 AL |
343 | } |
344 | ||
345 | netdev->txs = xc_gnttab_map_grant_ref(netdev->xendev.gnttabdev, | |
209cd7ab AP |
346 | netdev->xendev.dom, |
347 | netdev->tx_ring_ref, | |
348 | PROT_READ | PROT_WRITE); | |
b4f72e31 CG |
349 | if (!netdev->txs) { |
350 | return -1; | |
351 | } | |
e613b064 | 352 | netdev->rxs = xc_gnttab_map_grant_ref(netdev->xendev.gnttabdev, |
209cd7ab AP |
353 | netdev->xendev.dom, |
354 | netdev->rx_ring_ref, | |
355 | PROT_READ | PROT_WRITE); | |
b4f72e31 CG |
356 | if (!netdev->rxs) { |
357 | xc_gnttab_munmap(netdev->xendev.gnttabdev, netdev->txs, 1); | |
358 | netdev->txs = NULL; | |
209cd7ab AP |
359 | return -1; |
360 | } | |
e613b064 AL |
361 | BACK_RING_INIT(&netdev->tx_ring, netdev->txs, XC_PAGE_SIZE); |
362 | BACK_RING_INIT(&netdev->rx_ring, netdev->rxs, XC_PAGE_SIZE); | |
363 | ||
364 | xen_be_bind_evtchn(&netdev->xendev); | |
365 | ||
366 | xen_be_printf(&netdev->xendev, 1, "ok: tx-ring-ref %d, rx-ring-ref %d, " | |
209cd7ab AP |
367 | "remote port %d, local port %d\n", |
368 | netdev->tx_ring_ref, netdev->rx_ring_ref, | |
369 | netdev->xendev.remote_port, netdev->xendev.local_port); | |
3e3cabcf GH |
370 | |
371 | net_tx_packets(netdev); | |
e613b064 AL |
372 | return 0; |
373 | } | |
374 | ||
375 | static void net_disconnect(struct XenDevice *xendev) | |
376 | { | |
377 | struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev); | |
378 | ||
379 | xen_be_unbind_evtchn(&netdev->xendev); | |
380 | ||
381 | if (netdev->txs) { | |
209cd7ab AP |
382 | xc_gnttab_munmap(netdev->xendev.gnttabdev, netdev->txs, 1); |
383 | netdev->txs = NULL; | |
e613b064 AL |
384 | } |
385 | if (netdev->rxs) { | |
209cd7ab AP |
386 | xc_gnttab_munmap(netdev->xendev.gnttabdev, netdev->rxs, 1); |
387 | netdev->rxs = NULL; | |
e613b064 | 388 | } |
e613b064 AL |
389 | } |
390 | ||
391 | static void net_event(struct XenDevice *xendev) | |
392 | { | |
393 | struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev); | |
394 | net_tx_packets(netdev); | |
b356f76d | 395 | qemu_flush_queued_packets(qemu_get_queue(netdev->nic)); |
e613b064 AL |
396 | } |
397 | ||
398 | static int net_free(struct XenDevice *xendev) | |
399 | { | |
400 | struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev); | |
401 | ||
d4685837 CG |
402 | if (netdev->nic) { |
403 | qemu_del_nic(netdev->nic); | |
404 | netdev->nic = NULL; | |
405 | } | |
7267c094 | 406 | g_free(netdev->mac); |
a39d97c7 | 407 | netdev->mac = NULL; |
e613b064 AL |
408 | return 0; |
409 | } | |
410 | ||
411 | /* ------------------------------------------------------------- */ | |
412 | ||
413 | struct XenDevOps xen_netdev_ops = { | |
414 | .size = sizeof(struct XenNetDev), | |
415 | .flags = DEVOPS_FLAG_NEED_GNTDEV, | |
416 | .init = net_init, | |
384087b2 | 417 | .initialise = net_connect, |
e613b064 AL |
418 | .event = net_event, |
419 | .disconnect = net_disconnect, | |
420 | .free = net_free, | |
421 | }; |