Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Xenbus code for netif backend |
| 3 | * |
| 4 | * Copyright (C) 2005 Rusty Russell <rusty@rustcorp.com.au> |
| 5 | * Copyright (C) 2005 XenSource Ltd |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
Jeff Kirsher | adf8d3f | 2013-12-06 06:28:47 -0800 | [diff] [blame] | 18 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 19 | */ |
| 20 | |
| 21 | #include "common.h" |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 22 | #include <linux/vmalloc.h> |
| 23 | #include <linux/rtnetlink.h> |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 24 | |
| 25 | struct backend_info { |
| 26 | struct xenbus_device *dev; |
| 27 | struct xenvif *vif; |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 28 | |
| 29 | /* This is the state that will be reflected in xenstore when any |
| 30 | * active hotplug script completes. |
| 31 | */ |
| 32 | enum xenbus_state state; |
| 33 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 34 | enum xenbus_state frontend_state; |
| 35 | struct xenbus_watch hotplug_status_watch; |
Ian Campbell | 17938a6 | 2011-04-03 22:26:24 +0000 | [diff] [blame] | 36 | u8 have_hotplug_status_watch:1; |
Ian Campbell | 31a4189 | 2015-06-01 11:30:24 +0100 | [diff] [blame] | 37 | |
| 38 | const char *hotplug_script; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 39 | }; |
| 40 | |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 41 | static int connect_rings(struct backend_info *be, struct xenvif_queue *queue); |
| 42 | static void connect(struct backend_info *be); |
| 43 | static int read_xenbus_vif_flags(struct backend_info *be); |
Alexey Khoroshilov | 2dd3433 | 2014-11-24 13:58:00 +0300 | [diff] [blame] | 44 | static int backend_create_xenvif(struct backend_info *be); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 45 | static void unregister_hotplug_status_watch(struct backend_info *be); |
Palik, Imre | edafc13 | 2015-03-19 11:05:42 +0100 | [diff] [blame] | 46 | static void xen_unregister_watchers(struct xenvif *vif); |
David Vrabel | dc62cca | 2013-10-07 13:55:19 +0100 | [diff] [blame] | 47 | static void set_backend_state(struct backend_info *be, |
| 48 | enum xenbus_state state); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 49 | |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 50 | #ifdef CONFIG_DEBUG_FS |
| 51 | struct dentry *xen_netback_dbg_root = NULL; |
| 52 | |
| 53 | static int xenvif_read_io_ring(struct seq_file *m, void *v) |
| 54 | { |
| 55 | struct xenvif_queue *queue = m->private; |
| 56 | struct xen_netif_tx_back_ring *tx_ring = &queue->tx; |
| 57 | struct xen_netif_rx_back_ring *rx_ring = &queue->rx; |
David Vrabel | f48da8b | 2014-10-22 14:08:54 +0100 | [diff] [blame] | 58 | struct netdev_queue *dev_queue; |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 59 | |
| 60 | if (tx_ring->sring) { |
| 61 | struct xen_netif_tx_sring *sring = tx_ring->sring; |
| 62 | |
| 63 | seq_printf(m, "Queue %d\nTX: nr_ents %u\n", queue->id, |
| 64 | tx_ring->nr_ents); |
| 65 | seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n", |
| 66 | sring->req_prod, |
| 67 | sring->req_prod - sring->rsp_prod, |
| 68 | tx_ring->req_cons, |
| 69 | tx_ring->req_cons - sring->rsp_prod, |
| 70 | sring->req_event, |
| 71 | sring->req_event - sring->rsp_prod); |
| 72 | seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n", |
| 73 | sring->rsp_prod, |
| 74 | tx_ring->rsp_prod_pvt, |
| 75 | tx_ring->rsp_prod_pvt - sring->rsp_prod, |
| 76 | sring->rsp_event, |
| 77 | sring->rsp_event - sring->rsp_prod); |
| 78 | seq_printf(m, "pending prod %u pending cons %u nr_pending_reqs %u\n", |
| 79 | queue->pending_prod, |
| 80 | queue->pending_cons, |
| 81 | nr_pending_reqs(queue)); |
| 82 | seq_printf(m, "dealloc prod %u dealloc cons %u dealloc_queue %u\n\n", |
| 83 | queue->dealloc_prod, |
| 84 | queue->dealloc_cons, |
| 85 | queue->dealloc_prod - queue->dealloc_cons); |
| 86 | } |
| 87 | |
| 88 | if (rx_ring->sring) { |
| 89 | struct xen_netif_rx_sring *sring = rx_ring->sring; |
| 90 | |
| 91 | seq_printf(m, "RX: nr_ents %u\n", rx_ring->nr_ents); |
| 92 | seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n", |
| 93 | sring->req_prod, |
| 94 | sring->req_prod - sring->rsp_prod, |
| 95 | rx_ring->req_cons, |
| 96 | rx_ring->req_cons - sring->rsp_prod, |
| 97 | sring->req_event, |
| 98 | sring->req_event - sring->rsp_prod); |
| 99 | seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n\n", |
| 100 | sring->rsp_prod, |
| 101 | rx_ring->rsp_prod_pvt, |
| 102 | rx_ring->rsp_prod_pvt - sring->rsp_prod, |
| 103 | sring->rsp_event, |
| 104 | sring->rsp_event - sring->rsp_prod); |
| 105 | } |
| 106 | |
| 107 | seq_printf(m, "NAPI state: %lx NAPI weight: %d TX queue len %u\n" |
| 108 | "Credit timer_pending: %d, credit: %lu, usec: %lu\n" |
| 109 | "remaining: %lu, expires: %lu, now: %lu\n", |
| 110 | queue->napi.state, queue->napi.weight, |
| 111 | skb_queue_len(&queue->tx_queue), |
| 112 | timer_pending(&queue->credit_timeout), |
| 113 | queue->credit_bytes, |
| 114 | queue->credit_usec, |
| 115 | queue->remaining_credit, |
| 116 | queue->credit_timeout.expires, |
| 117 | jiffies); |
| 118 | |
David Vrabel | f48da8b | 2014-10-22 14:08:54 +0100 | [diff] [blame] | 119 | dev_queue = netdev_get_tx_queue(queue->vif->dev, queue->id); |
| 120 | |
| 121 | seq_printf(m, "\nRx internal queue: len %u max %u pkts %u %s\n", |
| 122 | queue->rx_queue_len, queue->rx_queue_max, |
| 123 | skb_queue_len(&queue->rx_queue), |
| 124 | netif_tx_queue_stopped(dev_queue) ? "stopped" : "running"); |
| 125 | |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | #define XENVIF_KICK_STR "kick" |
Wei Liu | 5c80700 | 2014-08-12 11:59:29 +0100 | [diff] [blame] | 130 | #define BUFFER_SIZE 32 |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 131 | |
| 132 | static ssize_t |
| 133 | xenvif_write_io_ring(struct file *filp, const char __user *buf, size_t count, |
| 134 | loff_t *ppos) |
| 135 | { |
| 136 | struct xenvif_queue *queue = |
| 137 | ((struct seq_file *)filp->private_data)->private; |
| 138 | int len; |
Wei Liu | 5c80700 | 2014-08-12 11:59:29 +0100 | [diff] [blame] | 139 | char write[BUFFER_SIZE]; |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 140 | |
| 141 | /* don't allow partial writes and check the length */ |
| 142 | if (*ppos != 0) |
| 143 | return 0; |
Wei Liu | 5c80700 | 2014-08-12 11:59:29 +0100 | [diff] [blame] | 144 | if (count >= sizeof(write)) |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 145 | return -ENOSPC; |
| 146 | |
| 147 | len = simple_write_to_buffer(write, |
Wei Liu | 5c80700 | 2014-08-12 11:59:29 +0100 | [diff] [blame] | 148 | sizeof(write) - 1, |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 149 | ppos, |
| 150 | buf, |
| 151 | count); |
| 152 | if (len < 0) |
| 153 | return len; |
| 154 | |
Wei Liu | 5c80700 | 2014-08-12 11:59:29 +0100 | [diff] [blame] | 155 | write[len] = '\0'; |
| 156 | |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 157 | if (!strncmp(write, XENVIF_KICK_STR, sizeof(XENVIF_KICK_STR) - 1)) |
| 158 | xenvif_interrupt(0, (void *)queue); |
| 159 | else { |
| 160 | pr_warn("Unknown command to io_ring_q%d. Available: kick\n", |
| 161 | queue->id); |
| 162 | count = -EINVAL; |
| 163 | } |
| 164 | return count; |
| 165 | } |
| 166 | |
| 167 | static int xenvif_dump_open(struct inode *inode, struct file *filp) |
| 168 | { |
| 169 | int ret; |
| 170 | void *queue = NULL; |
| 171 | |
| 172 | if (inode->i_private) |
| 173 | queue = inode->i_private; |
| 174 | ret = single_open(filp, xenvif_read_io_ring, queue); |
| 175 | filp->f_mode |= FMODE_PWRITE; |
| 176 | return ret; |
| 177 | } |
| 178 | |
| 179 | static const struct file_operations xenvif_dbg_io_ring_ops_fops = { |
| 180 | .owner = THIS_MODULE, |
| 181 | .open = xenvif_dump_open, |
| 182 | .read = seq_read, |
| 183 | .llseek = seq_lseek, |
| 184 | .release = single_release, |
| 185 | .write = xenvif_write_io_ring, |
| 186 | }; |
| 187 | |
Wei Liu | 628fa76 | 2014-08-12 11:59:30 +0100 | [diff] [blame] | 188 | static void xenvif_debugfs_addif(struct xenvif *vif) |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 189 | { |
| 190 | struct dentry *pfile; |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 191 | int i; |
| 192 | |
| 193 | if (IS_ERR_OR_NULL(xen_netback_dbg_root)) |
| 194 | return; |
| 195 | |
| 196 | vif->xenvif_dbg_root = debugfs_create_dir(vif->dev->name, |
| 197 | xen_netback_dbg_root); |
| 198 | if (!IS_ERR_OR_NULL(vif->xenvif_dbg_root)) { |
| 199 | for (i = 0; i < vif->num_queues; ++i) { |
| 200 | char filename[sizeof("io_ring_q") + 4]; |
| 201 | |
| 202 | snprintf(filename, sizeof(filename), "io_ring_q%d", i); |
| 203 | pfile = debugfs_create_file(filename, |
| 204 | S_IRUSR | S_IWUSR, |
| 205 | vif->xenvif_dbg_root, |
| 206 | &vif->queues[i], |
| 207 | &xenvif_dbg_io_ring_ops_fops); |
| 208 | if (IS_ERR_OR_NULL(pfile)) |
| 209 | pr_warn("Creation of io_ring file returned %ld!\n", |
| 210 | PTR_ERR(pfile)); |
| 211 | } |
| 212 | } else |
| 213 | netdev_warn(vif->dev, |
| 214 | "Creation of vif debugfs dir returned %ld!\n", |
| 215 | PTR_ERR(vif->xenvif_dbg_root)); |
| 216 | } |
| 217 | |
| 218 | static void xenvif_debugfs_delif(struct xenvif *vif) |
| 219 | { |
| 220 | if (IS_ERR_OR_NULL(xen_netback_dbg_root)) |
| 221 | return; |
| 222 | |
| 223 | if (!IS_ERR_OR_NULL(vif->xenvif_dbg_root)) |
| 224 | debugfs_remove_recursive(vif->xenvif_dbg_root); |
| 225 | vif->xenvif_dbg_root = NULL; |
| 226 | } |
| 227 | #endif /* CONFIG_DEBUG_FS */ |
| 228 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 229 | static int netback_remove(struct xenbus_device *dev) |
| 230 | { |
| 231 | struct backend_info *be = dev_get_drvdata(&dev->dev); |
| 232 | |
David Vrabel | dc62cca | 2013-10-07 13:55:19 +0100 | [diff] [blame] | 233 | set_backend_state(be, XenbusStateClosed); |
| 234 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 235 | unregister_hotplug_status_watch(be); |
| 236 | if (be->vif) { |
| 237 | kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE); |
Palik, Imre | edafc13 | 2015-03-19 11:05:42 +0100 | [diff] [blame] | 238 | xen_unregister_watchers(be->vif); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 239 | xenbus_rm(XBT_NIL, dev->nodename, "hotplug-status"); |
Paul Durrant | 279f438 | 2013-09-17 17:46:08 +0100 | [diff] [blame] | 240 | xenvif_free(be->vif); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 241 | be->vif = NULL; |
| 242 | } |
Ian Campbell | 31a4189 | 2015-06-01 11:30:24 +0100 | [diff] [blame] | 243 | kfree(be->hotplug_script); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 244 | kfree(be); |
| 245 | dev_set_drvdata(&dev->dev, NULL); |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | |
| 250 | /** |
| 251 | * Entry point to this code when a new device is created. Allocate the basic |
| 252 | * structures and switch to InitWait. |
| 253 | */ |
| 254 | static int netback_probe(struct xenbus_device *dev, |
| 255 | const struct xenbus_device_id *id) |
| 256 | { |
| 257 | const char *message; |
| 258 | struct xenbus_transaction xbt; |
| 259 | int err; |
| 260 | int sg; |
Ian Campbell | 31a4189 | 2015-06-01 11:30:24 +0100 | [diff] [blame] | 261 | const char *script; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 262 | struct backend_info *be = kzalloc(sizeof(struct backend_info), |
| 263 | GFP_KERNEL); |
| 264 | if (!be) { |
| 265 | xenbus_dev_fatal(dev, -ENOMEM, |
| 266 | "allocating backend structure"); |
| 267 | return -ENOMEM; |
| 268 | } |
| 269 | |
| 270 | be->dev = dev; |
| 271 | dev_set_drvdata(&dev->dev, be); |
| 272 | |
| 273 | sg = 1; |
| 274 | |
| 275 | do { |
| 276 | err = xenbus_transaction_start(&xbt); |
| 277 | if (err) { |
| 278 | xenbus_dev_fatal(dev, err, "starting transaction"); |
| 279 | goto fail; |
| 280 | } |
| 281 | |
| 282 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", sg); |
| 283 | if (err) { |
| 284 | message = "writing feature-sg"; |
| 285 | goto abort_transaction; |
| 286 | } |
| 287 | |
| 288 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", |
| 289 | "%d", sg); |
| 290 | if (err) { |
| 291 | message = "writing feature-gso-tcpv4"; |
| 292 | goto abort_transaction; |
| 293 | } |
| 294 | |
Paul Durrant | a946858 | 2013-10-16 17:50:31 +0100 | [diff] [blame] | 295 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv6", |
| 296 | "%d", sg); |
| 297 | if (err) { |
| 298 | message = "writing feature-gso-tcpv6"; |
| 299 | goto abort_transaction; |
| 300 | } |
| 301 | |
Paul Durrant | 2eba61d | 2013-10-16 17:50:29 +0100 | [diff] [blame] | 302 | /* We support partial checksum setup for IPv6 packets */ |
| 303 | err = xenbus_printf(xbt, dev->nodename, |
| 304 | "feature-ipv6-csum-offload", |
| 305 | "%d", 1); |
| 306 | if (err) { |
| 307 | message = "writing feature-ipv6-csum-offload"; |
| 308 | goto abort_transaction; |
| 309 | } |
| 310 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 311 | /* We support rx-copy path. */ |
| 312 | err = xenbus_printf(xbt, dev->nodename, |
| 313 | "feature-rx-copy", "%d", 1); |
| 314 | if (err) { |
| 315 | message = "writing feature-rx-copy"; |
| 316 | goto abort_transaction; |
| 317 | } |
| 318 | |
| 319 | /* |
| 320 | * We don't support rx-flip path (except old guests who don't |
| 321 | * grok this feature flag). |
| 322 | */ |
| 323 | err = xenbus_printf(xbt, dev->nodename, |
| 324 | "feature-rx-flip", "%d", 0); |
| 325 | if (err) { |
| 326 | message = "writing feature-rx-flip"; |
| 327 | goto abort_transaction; |
| 328 | } |
| 329 | |
| 330 | err = xenbus_transaction_end(xbt, 0); |
| 331 | } while (err == -EAGAIN); |
| 332 | |
| 333 | if (err) { |
| 334 | xenbus_dev_fatal(dev, err, "completing transaction"); |
| 335 | goto fail; |
| 336 | } |
| 337 | |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 338 | /* |
| 339 | * Split event channels support, this is optional so it is not |
| 340 | * put inside the above loop. |
| 341 | */ |
| 342 | err = xenbus_printf(XBT_NIL, dev->nodename, |
| 343 | "feature-split-event-channels", |
| 344 | "%u", separate_tx_rx_irq); |
| 345 | if (err) |
Wei Liu | 8ef2c3b | 2013-07-02 00:08:54 +0100 | [diff] [blame] | 346 | pr_debug("Error writing feature-split-event-channels\n"); |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 347 | |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 348 | /* Multi-queue support: This is an optional feature. */ |
| 349 | err = xenbus_printf(XBT_NIL, dev->nodename, |
| 350 | "multi-queue-max-queues", "%u", xenvif_max_queues); |
| 351 | if (err) |
| 352 | pr_debug("Error writing multi-queue-max-queues\n"); |
| 353 | |
Ian Campbell | 31a4189 | 2015-06-01 11:30:24 +0100 | [diff] [blame] | 354 | script = xenbus_read(XBT_NIL, dev->nodename, "script", NULL); |
| 355 | if (IS_ERR(script)) { |
| 356 | err = PTR_ERR(script); |
| 357 | xenbus_dev_fatal(dev, err, "reading script"); |
| 358 | goto fail; |
| 359 | } |
| 360 | |
| 361 | be->hotplug_script = script; |
| 362 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 363 | err = xenbus_switch_state(dev, XenbusStateInitWait); |
| 364 | if (err) |
| 365 | goto fail; |
| 366 | |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 367 | be->state = XenbusStateInitWait; |
| 368 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 369 | /* This kicks hotplug scripts, so do it immediately. */ |
Alexey Khoroshilov | 2dd3433 | 2014-11-24 13:58:00 +0300 | [diff] [blame] | 370 | err = backend_create_xenvif(be); |
| 371 | if (err) |
| 372 | goto fail; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 373 | |
| 374 | return 0; |
| 375 | |
| 376 | abort_transaction: |
| 377 | xenbus_transaction_end(xbt, 1); |
| 378 | xenbus_dev_fatal(dev, err, "%s", message); |
| 379 | fail: |
Wei Liu | 8ef2c3b | 2013-07-02 00:08:54 +0100 | [diff] [blame] | 380 | pr_debug("failed\n"); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 381 | netback_remove(dev); |
| 382 | return err; |
| 383 | } |
| 384 | |
| 385 | |
| 386 | /* |
| 387 | * Handle the creation of the hotplug script environment. We add the script |
| 388 | * and vif variables to the environment, for the benefit of the vif-* hotplug |
| 389 | * scripts. |
| 390 | */ |
| 391 | static int netback_uevent(struct xenbus_device *xdev, |
| 392 | struct kobj_uevent_env *env) |
| 393 | { |
| 394 | struct backend_info *be = dev_get_drvdata(&xdev->dev); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 395 | |
Ian Campbell | 31a4189 | 2015-06-01 11:30:24 +0100 | [diff] [blame] | 396 | if (!be) |
| 397 | return 0; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 398 | |
Ian Campbell | 31a4189 | 2015-06-01 11:30:24 +0100 | [diff] [blame] | 399 | if (add_uevent_var(env, "script=%s", be->hotplug_script)) |
| 400 | return -ENOMEM; |
| 401 | |
| 402 | if (!be->vif) |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 403 | return 0; |
| 404 | |
| 405 | return add_uevent_var(env, "vif=%s", be->vif->dev->name); |
| 406 | } |
| 407 | |
| 408 | |
Alexey Khoroshilov | 2dd3433 | 2014-11-24 13:58:00 +0300 | [diff] [blame] | 409 | static int backend_create_xenvif(struct backend_info *be) |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 410 | { |
| 411 | int err; |
| 412 | long handle; |
| 413 | struct xenbus_device *dev = be->dev; |
Jan Beulich | f15650b | 2014-12-09 11:47:04 +0000 | [diff] [blame] | 414 | struct xenvif *vif; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 415 | |
| 416 | if (be->vif != NULL) |
Alexey Khoroshilov | 2dd3433 | 2014-11-24 13:58:00 +0300 | [diff] [blame] | 417 | return 0; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 418 | |
| 419 | err = xenbus_scanf(XBT_NIL, dev->nodename, "handle", "%li", &handle); |
| 420 | if (err != 1) { |
| 421 | xenbus_dev_fatal(dev, err, "reading handle"); |
Alexey Khoroshilov | 2dd3433 | 2014-11-24 13:58:00 +0300 | [diff] [blame] | 422 | return (err < 0) ? err : -EINVAL; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 423 | } |
| 424 | |
Jan Beulich | f15650b | 2014-12-09 11:47:04 +0000 | [diff] [blame] | 425 | vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle); |
| 426 | if (IS_ERR(vif)) { |
| 427 | err = PTR_ERR(vif); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 428 | xenbus_dev_fatal(dev, err, "creating interface"); |
Alexey Khoroshilov | 2dd3433 | 2014-11-24 13:58:00 +0300 | [diff] [blame] | 429 | return err; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 430 | } |
Jan Beulich | f15650b | 2014-12-09 11:47:04 +0000 | [diff] [blame] | 431 | be->vif = vif; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 432 | |
| 433 | kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE); |
Alexey Khoroshilov | 2dd3433 | 2014-11-24 13:58:00 +0300 | [diff] [blame] | 434 | return 0; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 435 | } |
| 436 | |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 437 | static void backend_disconnect(struct backend_info *be) |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 438 | { |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 439 | if (be->vif) { |
Palik, Imre | edafc13 | 2015-03-19 11:05:42 +0100 | [diff] [blame] | 440 | xen_unregister_watchers(be->vif); |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 441 | #ifdef CONFIG_DEBUG_FS |
| 442 | xenvif_debugfs_delif(be->vif); |
| 443 | #endif /* CONFIG_DEBUG_FS */ |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 444 | xenvif_disconnect(be->vif); |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 445 | } |
Paul Durrant | 279f438 | 2013-09-17 17:46:08 +0100 | [diff] [blame] | 446 | } |
| 447 | |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 448 | static void backend_connect(struct backend_info *be) |
Paul Durrant | 279f438 | 2013-09-17 17:46:08 +0100 | [diff] [blame] | 449 | { |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 450 | if (be->vif) |
| 451 | connect(be); |
| 452 | } |
Paul Durrant | 279f438 | 2013-09-17 17:46:08 +0100 | [diff] [blame] | 453 | |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 454 | static inline void backend_switch_state(struct backend_info *be, |
| 455 | enum xenbus_state state) |
| 456 | { |
| 457 | struct xenbus_device *dev = be->dev; |
| 458 | |
| 459 | pr_debug("%s -> %s\n", dev->nodename, xenbus_strstate(state)); |
| 460 | be->state = state; |
| 461 | |
| 462 | /* If we are waiting for a hotplug script then defer the |
| 463 | * actual xenbus state change. |
| 464 | */ |
| 465 | if (!be->have_hotplug_status_watch) |
| 466 | xenbus_switch_state(dev, state); |
| 467 | } |
| 468 | |
| 469 | /* Handle backend state transitions: |
| 470 | * |
| 471 | * The backend state starts in InitWait and the following transitions are |
| 472 | * allowed. |
| 473 | * |
| 474 | * InitWait -> Connected |
| 475 | * |
| 476 | * ^ \ | |
| 477 | * | \ | |
| 478 | * | \ | |
| 479 | * | \ | |
| 480 | * | \ | |
| 481 | * | \ | |
| 482 | * | V V |
| 483 | * |
| 484 | * Closed <-> Closing |
| 485 | * |
| 486 | * The state argument specifies the eventual state of the backend and the |
| 487 | * function transitions to that state via the shortest path. |
| 488 | */ |
| 489 | static void set_backend_state(struct backend_info *be, |
| 490 | enum xenbus_state state) |
| 491 | { |
| 492 | while (be->state != state) { |
| 493 | switch (be->state) { |
| 494 | case XenbusStateClosed: |
| 495 | switch (state) { |
| 496 | case XenbusStateInitWait: |
| 497 | case XenbusStateConnected: |
| 498 | pr_info("%s: prepare for reconnect\n", |
| 499 | be->dev->nodename); |
| 500 | backend_switch_state(be, XenbusStateInitWait); |
| 501 | break; |
| 502 | case XenbusStateClosing: |
| 503 | backend_switch_state(be, XenbusStateClosing); |
| 504 | break; |
| 505 | default: |
| 506 | BUG(); |
| 507 | } |
| 508 | break; |
| 509 | case XenbusStateInitWait: |
| 510 | switch (state) { |
| 511 | case XenbusStateConnected: |
| 512 | backend_connect(be); |
| 513 | backend_switch_state(be, XenbusStateConnected); |
| 514 | break; |
| 515 | case XenbusStateClosing: |
| 516 | case XenbusStateClosed: |
| 517 | backend_switch_state(be, XenbusStateClosing); |
| 518 | break; |
| 519 | default: |
| 520 | BUG(); |
| 521 | } |
| 522 | break; |
| 523 | case XenbusStateConnected: |
| 524 | switch (state) { |
| 525 | case XenbusStateInitWait: |
| 526 | case XenbusStateClosing: |
| 527 | case XenbusStateClosed: |
| 528 | backend_disconnect(be); |
| 529 | backend_switch_state(be, XenbusStateClosing); |
| 530 | break; |
| 531 | default: |
| 532 | BUG(); |
| 533 | } |
| 534 | break; |
| 535 | case XenbusStateClosing: |
| 536 | switch (state) { |
| 537 | case XenbusStateInitWait: |
| 538 | case XenbusStateConnected: |
| 539 | case XenbusStateClosed: |
| 540 | backend_switch_state(be, XenbusStateClosed); |
| 541 | break; |
| 542 | default: |
| 543 | BUG(); |
| 544 | } |
| 545 | break; |
| 546 | default: |
| 547 | BUG(); |
| 548 | } |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 549 | } |
| 550 | } |
| 551 | |
| 552 | /** |
| 553 | * Callback received when the frontend's state changes. |
| 554 | */ |
| 555 | static void frontend_changed(struct xenbus_device *dev, |
| 556 | enum xenbus_state frontend_state) |
| 557 | { |
| 558 | struct backend_info *be = dev_get_drvdata(&dev->dev); |
| 559 | |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 560 | pr_debug("%s -> %s\n", dev->otherend, xenbus_strstate(frontend_state)); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 561 | |
| 562 | be->frontend_state = frontend_state; |
| 563 | |
| 564 | switch (frontend_state) { |
| 565 | case XenbusStateInitialising: |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 566 | set_backend_state(be, XenbusStateInitWait); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 567 | break; |
| 568 | |
| 569 | case XenbusStateInitialised: |
| 570 | break; |
| 571 | |
| 572 | case XenbusStateConnected: |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 573 | set_backend_state(be, XenbusStateConnected); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 574 | break; |
| 575 | |
| 576 | case XenbusStateClosing: |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 577 | set_backend_state(be, XenbusStateClosing); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 578 | break; |
| 579 | |
| 580 | case XenbusStateClosed: |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 581 | set_backend_state(be, XenbusStateClosed); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 582 | if (xenbus_dev_is_online(dev)) |
| 583 | break; |
| 584 | /* fall through if not online */ |
| 585 | case XenbusStateUnknown: |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 586 | set_backend_state(be, XenbusStateClosed); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 587 | device_unregister(&dev->dev); |
| 588 | break; |
| 589 | |
| 590 | default: |
| 591 | xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", |
| 592 | frontend_state); |
| 593 | break; |
| 594 | } |
| 595 | } |
| 596 | |
| 597 | |
| 598 | static void xen_net_read_rate(struct xenbus_device *dev, |
| 599 | unsigned long *bytes, unsigned long *usec) |
| 600 | { |
| 601 | char *s, *e; |
| 602 | unsigned long b, u; |
| 603 | char *ratestr; |
| 604 | |
| 605 | /* Default to unlimited bandwidth. */ |
| 606 | *bytes = ~0UL; |
| 607 | *usec = 0; |
| 608 | |
| 609 | ratestr = xenbus_read(XBT_NIL, dev->nodename, "rate", NULL); |
| 610 | if (IS_ERR(ratestr)) |
| 611 | return; |
| 612 | |
| 613 | s = ratestr; |
| 614 | b = simple_strtoul(s, &e, 10); |
| 615 | if ((s == e) || (*e != ',')) |
| 616 | goto fail; |
| 617 | |
| 618 | s = e + 1; |
| 619 | u = simple_strtoul(s, &e, 10); |
| 620 | if ((s == e) || (*e != '\0')) |
| 621 | goto fail; |
| 622 | |
| 623 | *bytes = b; |
| 624 | *usec = u; |
| 625 | |
| 626 | kfree(ratestr); |
| 627 | return; |
| 628 | |
| 629 | fail: |
| 630 | pr_warn("Failed to parse network rate limit. Traffic unlimited.\n"); |
| 631 | kfree(ratestr); |
| 632 | } |
| 633 | |
| 634 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) |
| 635 | { |
| 636 | char *s, *e, *macstr; |
| 637 | int i; |
| 638 | |
| 639 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); |
| 640 | if (IS_ERR(macstr)) |
| 641 | return PTR_ERR(macstr); |
| 642 | |
| 643 | for (i = 0; i < ETH_ALEN; i++) { |
| 644 | mac[i] = simple_strtoul(s, &e, 16); |
| 645 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { |
| 646 | kfree(macstr); |
| 647 | return -ENOENT; |
| 648 | } |
| 649 | s = e+1; |
| 650 | } |
| 651 | |
| 652 | kfree(macstr); |
| 653 | return 0; |
| 654 | } |
| 655 | |
Palik, Imre | edafc13 | 2015-03-19 11:05:42 +0100 | [diff] [blame] | 656 | static void xen_net_rate_changed(struct xenbus_watch *watch, |
| 657 | const char **vec, unsigned int len) |
| 658 | { |
| 659 | struct xenvif *vif = container_of(watch, struct xenvif, credit_watch); |
| 660 | struct xenbus_device *dev = xenvif_to_xenbus_device(vif); |
| 661 | unsigned long credit_bytes; |
| 662 | unsigned long credit_usec; |
| 663 | unsigned int queue_index; |
| 664 | |
| 665 | xen_net_read_rate(dev, &credit_bytes, &credit_usec); |
| 666 | for (queue_index = 0; queue_index < vif->num_queues; queue_index++) { |
| 667 | struct xenvif_queue *queue = &vif->queues[queue_index]; |
| 668 | |
| 669 | queue->credit_bytes = credit_bytes; |
| 670 | queue->credit_usec = credit_usec; |
| 671 | if (!mod_timer_pending(&queue->credit_timeout, jiffies) && |
| 672 | queue->remaining_credit > queue->credit_bytes) { |
| 673 | queue->remaining_credit = queue->credit_bytes; |
| 674 | } |
| 675 | } |
| 676 | } |
| 677 | |
| 678 | static int xen_register_watchers(struct xenbus_device *dev, struct xenvif *vif) |
| 679 | { |
| 680 | int err = 0; |
| 681 | char *node; |
| 682 | unsigned maxlen = strlen(dev->nodename) + sizeof("/rate"); |
| 683 | |
| 684 | node = kmalloc(maxlen, GFP_KERNEL); |
| 685 | if (!node) |
| 686 | return -ENOMEM; |
| 687 | snprintf(node, maxlen, "%s/rate", dev->nodename); |
| 688 | vif->credit_watch.node = node; |
| 689 | vif->credit_watch.callback = xen_net_rate_changed; |
| 690 | err = register_xenbus_watch(&vif->credit_watch); |
| 691 | if (err) { |
| 692 | pr_err("Failed to set watcher %s\n", vif->credit_watch.node); |
| 693 | kfree(node); |
| 694 | vif->credit_watch.node = NULL; |
| 695 | vif->credit_watch.callback = NULL; |
| 696 | } |
| 697 | return err; |
| 698 | } |
| 699 | |
| 700 | static void xen_unregister_watchers(struct xenvif *vif) |
| 701 | { |
| 702 | if (vif->credit_watch.node) { |
| 703 | unregister_xenbus_watch(&vif->credit_watch); |
| 704 | kfree(vif->credit_watch.node); |
| 705 | vif->credit_watch.node = NULL; |
| 706 | } |
| 707 | } |
| 708 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 709 | static void unregister_hotplug_status_watch(struct backend_info *be) |
| 710 | { |
| 711 | if (be->have_hotplug_status_watch) { |
| 712 | unregister_xenbus_watch(&be->hotplug_status_watch); |
| 713 | kfree(be->hotplug_status_watch.node); |
| 714 | } |
| 715 | be->have_hotplug_status_watch = 0; |
| 716 | } |
| 717 | |
| 718 | static void hotplug_status_changed(struct xenbus_watch *watch, |
| 719 | const char **vec, |
| 720 | unsigned int vec_size) |
| 721 | { |
| 722 | struct backend_info *be = container_of(watch, |
| 723 | struct backend_info, |
| 724 | hotplug_status_watch); |
| 725 | char *str; |
| 726 | unsigned int len; |
| 727 | |
| 728 | str = xenbus_read(XBT_NIL, be->dev->nodename, "hotplug-status", &len); |
| 729 | if (IS_ERR(str)) |
| 730 | return; |
| 731 | if (len == sizeof("connected")-1 && !memcmp(str, "connected", len)) { |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 732 | /* Complete any pending state change */ |
| 733 | xenbus_switch_state(be->dev, be->state); |
| 734 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 735 | /* Not interested in this watch anymore. */ |
| 736 | unregister_hotplug_status_watch(be); |
| 737 | } |
| 738 | kfree(str); |
| 739 | } |
| 740 | |
| 741 | static void connect(struct backend_info *be) |
| 742 | { |
| 743 | int err; |
| 744 | struct xenbus_device *dev = be->dev; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 745 | unsigned long credit_bytes, credit_usec; |
| 746 | unsigned int queue_index; |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 747 | unsigned int requested_num_queues; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 748 | struct xenvif_queue *queue; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 749 | |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 750 | /* Check whether the frontend requested multiple queues |
| 751 | * and read the number requested. |
| 752 | */ |
| 753 | err = xenbus_scanf(XBT_NIL, dev->otherend, |
| 754 | "multi-queue-num-queues", |
| 755 | "%u", &requested_num_queues); |
| 756 | if (err < 0) { |
| 757 | requested_num_queues = 1; /* Fall back to single queue */ |
| 758 | } else if (requested_num_queues > xenvif_max_queues) { |
| 759 | /* buggy or malicious guest */ |
| 760 | xenbus_dev_fatal(dev, err, |
| 761 | "guest requested %u queues, exceeding the maximum of %u.", |
| 762 | requested_num_queues, xenvif_max_queues); |
| 763 | return; |
| 764 | } |
| 765 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 766 | err = xen_net_read_mac(dev, be->vif->fe_dev_addr); |
| 767 | if (err) { |
| 768 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); |
| 769 | return; |
| 770 | } |
| 771 | |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 772 | xen_net_read_rate(dev, &credit_bytes, &credit_usec); |
Palik, Imre | edafc13 | 2015-03-19 11:05:42 +0100 | [diff] [blame] | 773 | xen_register_watchers(dev, be->vif); |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 774 | read_xenbus_vif_flags(be); |
| 775 | |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 776 | /* Use the number of queues requested by the frontend */ |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 777 | be->vif->queues = vzalloc(requested_num_queues * |
| 778 | sizeof(struct xenvif_queue)); |
Wei Liu | f7b50c4 | 2014-06-23 10:50:17 +0100 | [diff] [blame] | 779 | be->vif->num_queues = requested_num_queues; |
David Vrabel | ecf08d2 | 2014-10-22 14:08:55 +0100 | [diff] [blame] | 780 | be->vif->stalled_queues = requested_num_queues; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 781 | |
| 782 | for (queue_index = 0; queue_index < requested_num_queues; ++queue_index) { |
| 783 | queue = &be->vif->queues[queue_index]; |
| 784 | queue->vif = be->vif; |
| 785 | queue->id = queue_index; |
| 786 | snprintf(queue->name, sizeof(queue->name), "%s-q%u", |
| 787 | be->vif->dev->name, queue->id); |
| 788 | |
| 789 | err = xenvif_init_queue(queue); |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 790 | if (err) { |
| 791 | /* xenvif_init_queue() cleans up after itself on |
| 792 | * failure, but we need to clean up any previously |
| 793 | * initialised queues. Set num_queues to i so that |
| 794 | * earlier queues can be destroyed using the regular |
| 795 | * disconnect logic. |
| 796 | */ |
Wei Liu | f7b50c4 | 2014-06-23 10:50:17 +0100 | [diff] [blame] | 797 | be->vif->num_queues = queue_index; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 798 | goto err; |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 799 | } |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 800 | |
Ross Lagerwall | ce0e5c5 | 2015-05-27 11:44:32 +0100 | [diff] [blame] | 801 | queue->credit_bytes = credit_bytes; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 802 | queue->remaining_credit = credit_bytes; |
Palik, Imre | 07ff890 | 2015-01-06 16:44:44 +0100 | [diff] [blame] | 803 | queue->credit_usec = credit_usec; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 804 | |
| 805 | err = connect_rings(be, queue); |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 806 | if (err) { |
| 807 | /* connect_rings() cleans up after itself on failure, |
| 808 | * but we need to clean up after xenvif_init_queue() here, |
| 809 | * and also clean up any previously initialised queues. |
| 810 | */ |
| 811 | xenvif_deinit_queue(queue); |
Wei Liu | f7b50c4 | 2014-06-23 10:50:17 +0100 | [diff] [blame] | 812 | be->vif->num_queues = queue_index; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 813 | goto err; |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 814 | } |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 815 | } |
| 816 | |
Wei Liu | 628fa76 | 2014-08-12 11:59:30 +0100 | [diff] [blame] | 817 | #ifdef CONFIG_DEBUG_FS |
| 818 | xenvif_debugfs_addif(be->vif); |
| 819 | #endif /* CONFIG_DEBUG_FS */ |
| 820 | |
Wei Liu | f7b50c4 | 2014-06-23 10:50:17 +0100 | [diff] [blame] | 821 | /* Initialisation completed, tell core driver the number of |
| 822 | * active queues. |
| 823 | */ |
| 824 | rtnl_lock(); |
| 825 | netif_set_real_num_tx_queues(be->vif->dev, requested_num_queues); |
| 826 | netif_set_real_num_rx_queues(be->vif->dev, requested_num_queues); |
| 827 | rtnl_unlock(); |
| 828 | |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 829 | xenvif_carrier_on(be->vif); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 830 | |
| 831 | unregister_hotplug_status_watch(be); |
| 832 | err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch, |
| 833 | hotplug_status_changed, |
| 834 | "%s/%s", dev->nodename, "hotplug-status"); |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 835 | if (!err) |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 836 | be->have_hotplug_status_watch = 1; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 837 | |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 838 | netif_tx_wake_all_queues(be->vif->dev); |
| 839 | |
| 840 | return; |
| 841 | |
| 842 | err: |
Wei Liu | f7b50c4 | 2014-06-23 10:50:17 +0100 | [diff] [blame] | 843 | if (be->vif->num_queues > 0) |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 844 | xenvif_disconnect(be->vif); /* Clean up existing queues */ |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 845 | vfree(be->vif->queues); |
| 846 | be->vif->queues = NULL; |
Wei Liu | f7b50c4 | 2014-06-23 10:50:17 +0100 | [diff] [blame] | 847 | be->vif->num_queues = 0; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 848 | return; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 849 | } |
| 850 | |
| 851 | |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 852 | static int connect_rings(struct backend_info *be, struct xenvif_queue *queue) |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 853 | { |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 854 | struct xenbus_device *dev = be->dev; |
Wei Liu | f7b50c4 | 2014-06-23 10:50:17 +0100 | [diff] [blame] | 855 | unsigned int num_queues = queue->vif->num_queues; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 856 | unsigned long tx_ring_ref, rx_ring_ref; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 857 | unsigned int tx_evtchn, rx_evtchn; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 858 | int err; |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 859 | char *xspath; |
| 860 | size_t xspathsize; |
| 861 | const size_t xenstore_path_ext_size = 11; /* sufficient for "/queue-NNN" */ |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 862 | |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 863 | /* If the frontend requested 1 queue, or we have fallen back |
| 864 | * to single queue due to lack of frontend support for multi- |
| 865 | * queue, expect the remaining XenStore keys in the toplevel |
| 866 | * directory. Otherwise, expect them in a subdirectory called |
| 867 | * queue-N. |
| 868 | */ |
| 869 | if (num_queues == 1) { |
| 870 | xspath = kzalloc(strlen(dev->otherend) + 1, GFP_KERNEL); |
| 871 | if (!xspath) { |
| 872 | xenbus_dev_fatal(dev, -ENOMEM, |
| 873 | "reading ring references"); |
| 874 | return -ENOMEM; |
| 875 | } |
| 876 | strcpy(xspath, dev->otherend); |
| 877 | } else { |
| 878 | xspathsize = strlen(dev->otherend) + xenstore_path_ext_size; |
| 879 | xspath = kzalloc(xspathsize, GFP_KERNEL); |
| 880 | if (!xspath) { |
| 881 | xenbus_dev_fatal(dev, -ENOMEM, |
| 882 | "reading ring references"); |
| 883 | return -ENOMEM; |
| 884 | } |
| 885 | snprintf(xspath, xspathsize, "%s/queue-%u", dev->otherend, |
| 886 | queue->id); |
| 887 | } |
| 888 | |
| 889 | err = xenbus_gather(XBT_NIL, xspath, |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 890 | "tx-ring-ref", "%lu", &tx_ring_ref, |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 891 | "rx-ring-ref", "%lu", &rx_ring_ref, NULL); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 892 | if (err) { |
| 893 | xenbus_dev_fatal(dev, err, |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 894 | "reading %s/ring-ref", |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 895 | xspath); |
| 896 | goto err; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 897 | } |
| 898 | |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 899 | /* Try split event channels first, then single event channel. */ |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 900 | err = xenbus_gather(XBT_NIL, xspath, |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 901 | "event-channel-tx", "%u", &tx_evtchn, |
| 902 | "event-channel-rx", "%u", &rx_evtchn, NULL); |
| 903 | if (err < 0) { |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 904 | err = xenbus_scanf(XBT_NIL, xspath, |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 905 | "event-channel", "%u", &tx_evtchn); |
| 906 | if (err < 0) { |
| 907 | xenbus_dev_fatal(dev, err, |
| 908 | "reading %s/event-channel(-tx/rx)", |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 909 | xspath); |
| 910 | goto err; |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 911 | } |
| 912 | rx_evtchn = tx_evtchn; |
| 913 | } |
| 914 | |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 915 | /* Map the shared frame, irq etc. */ |
| 916 | err = xenvif_connect(queue, tx_ring_ref, rx_ring_ref, |
| 917 | tx_evtchn, rx_evtchn); |
| 918 | if (err) { |
| 919 | xenbus_dev_fatal(dev, err, |
| 920 | "mapping shared-frames %lu/%lu port tx %u rx %u", |
| 921 | tx_ring_ref, rx_ring_ref, |
| 922 | tx_evtchn, rx_evtchn); |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 923 | goto err; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 924 | } |
| 925 | |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 926 | err = 0; |
| 927 | err: /* Regular return falls through with err == 0 */ |
| 928 | kfree(xspath); |
| 929 | return err; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 930 | } |
| 931 | |
| 932 | static int read_xenbus_vif_flags(struct backend_info *be) |
| 933 | { |
| 934 | struct xenvif *vif = be->vif; |
| 935 | struct xenbus_device *dev = be->dev; |
| 936 | unsigned int rx_copy; |
| 937 | int err, val; |
| 938 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 939 | err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u", |
| 940 | &rx_copy); |
| 941 | if (err == -ENOENT) { |
| 942 | err = 0; |
| 943 | rx_copy = 0; |
| 944 | } |
| 945 | if (err < 0) { |
| 946 | xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy", |
| 947 | dev->otherend); |
| 948 | return err; |
| 949 | } |
| 950 | if (!rx_copy) |
| 951 | return -EOPNOTSUPP; |
| 952 | |
David Vrabel | bc96f64 | 2014-10-22 14:08:53 +0100 | [diff] [blame] | 953 | if (xenbus_scanf(XBT_NIL, dev->otherend, |
David Vrabel | 26c0e10 | 2014-12-18 11:13:06 +0000 | [diff] [blame] | 954 | "feature-rx-notify", "%d", &val) < 0) |
| 955 | val = 0; |
| 956 | if (!val) { |
| 957 | /* - Reduce drain timeout to poll more frequently for |
| 958 | * Rx requests. |
| 959 | * - Disable Rx stall detection. |
| 960 | */ |
| 961 | be->vif->drain_timeout = msecs_to_jiffies(30); |
| 962 | be->vif->stall_timeout = 0; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 963 | } |
| 964 | |
| 965 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg", |
| 966 | "%d", &val) < 0) |
| 967 | val = 0; |
| 968 | vif->can_sg = !!val; |
| 969 | |
Paul Durrant | 82cada2 | 2013-10-16 17:50:32 +0100 | [diff] [blame] | 970 | vif->gso_mask = 0; |
| 971 | vif->gso_prefix_mask = 0; |
| 972 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 973 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4", |
| 974 | "%d", &val) < 0) |
| 975 | val = 0; |
Paul Durrant | 82cada2 | 2013-10-16 17:50:32 +0100 | [diff] [blame] | 976 | if (val) |
| 977 | vif->gso_mask |= GSO_BIT(TCPV4); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 978 | |
| 979 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4-prefix", |
| 980 | "%d", &val) < 0) |
| 981 | val = 0; |
Paul Durrant | 82cada2 | 2013-10-16 17:50:32 +0100 | [diff] [blame] | 982 | if (val) |
| 983 | vif->gso_prefix_mask |= GSO_BIT(TCPV4); |
| 984 | |
| 985 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6", |
| 986 | "%d", &val) < 0) |
| 987 | val = 0; |
| 988 | if (val) |
| 989 | vif->gso_mask |= GSO_BIT(TCPV6); |
| 990 | |
| 991 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6-prefix", |
| 992 | "%d", &val) < 0) |
| 993 | val = 0; |
| 994 | if (val) |
| 995 | vif->gso_prefix_mask |= GSO_BIT(TCPV6); |
| 996 | |
| 997 | if (vif->gso_mask & vif->gso_prefix_mask) { |
| 998 | xenbus_dev_fatal(dev, err, |
| 999 | "%s: gso and gso prefix flags are not " |
| 1000 | "mutually exclusive", |
| 1001 | dev->otherend); |
| 1002 | return -EOPNOTSUPP; |
| 1003 | } |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1004 | |
| 1005 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload", |
| 1006 | "%d", &val) < 0) |
| 1007 | val = 0; |
Paul Durrant | 146c8a7 | 2013-10-16 17:50:28 +0100 | [diff] [blame] | 1008 | vif->ip_csum = !val; |
| 1009 | |
| 1010 | if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-ipv6-csum-offload", |
| 1011 | "%d", &val) < 0) |
| 1012 | val = 0; |
| 1013 | vif->ipv6_csum = !!val; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1014 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1015 | return 0; |
| 1016 | } |
| 1017 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1018 | static const struct xenbus_device_id netback_ids[] = { |
| 1019 | { "vif" }, |
| 1020 | { "" } |
| 1021 | }; |
| 1022 | |
David Vrabel | 95afae4 | 2014-09-08 17:30:41 +0100 | [diff] [blame] | 1023 | static struct xenbus_driver netback_driver = { |
| 1024 | .ids = netback_ids, |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1025 | .probe = netback_probe, |
| 1026 | .remove = netback_remove, |
| 1027 | .uevent = netback_uevent, |
| 1028 | .otherend_changed = frontend_changed, |
David Vrabel | 95afae4 | 2014-09-08 17:30:41 +0100 | [diff] [blame] | 1029 | }; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1030 | |
| 1031 | int xenvif_xenbus_init(void) |
| 1032 | { |
Jan Beulich | 73db144 | 2011-12-22 09:08:13 +0000 | [diff] [blame] | 1033 | return xenbus_register_backend(&netback_driver); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1034 | } |
Wei Liu | b103f35 | 2013-05-16 23:26:11 +0000 | [diff] [blame] | 1035 | |
| 1036 | void xenvif_xenbus_fini(void) |
| 1037 | { |
| 1038 | return xenbus_unregister_driver(&netback_driver); |
| 1039 | } |