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 | |
Paul Durrant | 4e15ee2 | 2016-05-13 09:37:26 +0100 | [diff] [blame] | 41 | static int connect_data_rings(struct backend_info *be, |
| 42 | struct xenvif_queue *queue); |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 43 | static void connect(struct backend_info *be); |
| 44 | static int read_xenbus_vif_flags(struct backend_info *be); |
Alexey Khoroshilov | 2dd3433 | 2014-11-24 13:58:00 +0300 | [diff] [blame] | 45 | static int backend_create_xenvif(struct backend_info *be); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 46 | static void unregister_hotplug_status_watch(struct backend_info *be); |
Palik, Imre | edafc13 | 2015-03-19 11:05:42 +0100 | [diff] [blame] | 47 | static void xen_unregister_watchers(struct xenvif *vif); |
David Vrabel | dc62cca | 2013-10-07 13:55:19 +0100 | [diff] [blame] | 48 | static void set_backend_state(struct backend_info *be, |
| 49 | enum xenbus_state state); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 50 | |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 51 | #ifdef CONFIG_DEBUG_FS |
| 52 | struct dentry *xen_netback_dbg_root = NULL; |
| 53 | |
| 54 | static int xenvif_read_io_ring(struct seq_file *m, void *v) |
| 55 | { |
| 56 | struct xenvif_queue *queue = m->private; |
| 57 | struct xen_netif_tx_back_ring *tx_ring = &queue->tx; |
| 58 | struct xen_netif_rx_back_ring *rx_ring = &queue->rx; |
David Vrabel | f48da8b | 2014-10-22 14:08:54 +0100 | [diff] [blame] | 59 | struct netdev_queue *dev_queue; |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 60 | |
| 61 | if (tx_ring->sring) { |
| 62 | struct xen_netif_tx_sring *sring = tx_ring->sring; |
| 63 | |
| 64 | seq_printf(m, "Queue %d\nTX: nr_ents %u\n", queue->id, |
| 65 | tx_ring->nr_ents); |
| 66 | seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n", |
| 67 | sring->req_prod, |
| 68 | sring->req_prod - sring->rsp_prod, |
| 69 | tx_ring->req_cons, |
| 70 | tx_ring->req_cons - sring->rsp_prod, |
| 71 | sring->req_event, |
| 72 | sring->req_event - sring->rsp_prod); |
| 73 | seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n", |
| 74 | sring->rsp_prod, |
| 75 | tx_ring->rsp_prod_pvt, |
| 76 | tx_ring->rsp_prod_pvt - sring->rsp_prod, |
| 77 | sring->rsp_event, |
| 78 | sring->rsp_event - sring->rsp_prod); |
| 79 | seq_printf(m, "pending prod %u pending cons %u nr_pending_reqs %u\n", |
| 80 | queue->pending_prod, |
| 81 | queue->pending_cons, |
| 82 | nr_pending_reqs(queue)); |
| 83 | seq_printf(m, "dealloc prod %u dealloc cons %u dealloc_queue %u\n\n", |
| 84 | queue->dealloc_prod, |
| 85 | queue->dealloc_cons, |
| 86 | queue->dealloc_prod - queue->dealloc_cons); |
| 87 | } |
| 88 | |
| 89 | if (rx_ring->sring) { |
| 90 | struct xen_netif_rx_sring *sring = rx_ring->sring; |
| 91 | |
| 92 | seq_printf(m, "RX: nr_ents %u\n", rx_ring->nr_ents); |
| 93 | seq_printf(m, "req prod %u (%d) cons %u (%d) event %u (%d)\n", |
| 94 | sring->req_prod, |
| 95 | sring->req_prod - sring->rsp_prod, |
| 96 | rx_ring->req_cons, |
| 97 | rx_ring->req_cons - sring->rsp_prod, |
| 98 | sring->req_event, |
| 99 | sring->req_event - sring->rsp_prod); |
| 100 | seq_printf(m, "rsp prod %u (base) pvt %u (%d) event %u (%d)\n\n", |
| 101 | sring->rsp_prod, |
| 102 | rx_ring->rsp_prod_pvt, |
| 103 | rx_ring->rsp_prod_pvt - sring->rsp_prod, |
| 104 | sring->rsp_event, |
| 105 | sring->rsp_event - sring->rsp_prod); |
| 106 | } |
| 107 | |
| 108 | seq_printf(m, "NAPI state: %lx NAPI weight: %d TX queue len %u\n" |
| 109 | "Credit timer_pending: %d, credit: %lu, usec: %lu\n" |
| 110 | "remaining: %lu, expires: %lu, now: %lu\n", |
| 111 | queue->napi.state, queue->napi.weight, |
| 112 | skb_queue_len(&queue->tx_queue), |
| 113 | timer_pending(&queue->credit_timeout), |
| 114 | queue->credit_bytes, |
| 115 | queue->credit_usec, |
| 116 | queue->remaining_credit, |
| 117 | queue->credit_timeout.expires, |
| 118 | jiffies); |
| 119 | |
David Vrabel | f48da8b | 2014-10-22 14:08:54 +0100 | [diff] [blame] | 120 | dev_queue = netdev_get_tx_queue(queue->vif->dev, queue->id); |
| 121 | |
| 122 | seq_printf(m, "\nRx internal queue: len %u max %u pkts %u %s\n", |
| 123 | queue->rx_queue_len, queue->rx_queue_max, |
| 124 | skb_queue_len(&queue->rx_queue), |
| 125 | netif_tx_queue_stopped(dev_queue) ? "stopped" : "running"); |
| 126 | |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | #define XENVIF_KICK_STR "kick" |
Wei Liu | 5c80700 | 2014-08-12 11:59:29 +0100 | [diff] [blame] | 131 | #define BUFFER_SIZE 32 |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 132 | |
| 133 | static ssize_t |
| 134 | xenvif_write_io_ring(struct file *filp, const char __user *buf, size_t count, |
| 135 | loff_t *ppos) |
| 136 | { |
| 137 | struct xenvif_queue *queue = |
| 138 | ((struct seq_file *)filp->private_data)->private; |
| 139 | int len; |
Wei Liu | 5c80700 | 2014-08-12 11:59:29 +0100 | [diff] [blame] | 140 | char write[BUFFER_SIZE]; |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 141 | |
| 142 | /* don't allow partial writes and check the length */ |
| 143 | if (*ppos != 0) |
| 144 | return 0; |
Wei Liu | 5c80700 | 2014-08-12 11:59:29 +0100 | [diff] [blame] | 145 | if (count >= sizeof(write)) |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 146 | return -ENOSPC; |
| 147 | |
| 148 | len = simple_write_to_buffer(write, |
Wei Liu | 5c80700 | 2014-08-12 11:59:29 +0100 | [diff] [blame] | 149 | sizeof(write) - 1, |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 150 | ppos, |
| 151 | buf, |
| 152 | count); |
| 153 | if (len < 0) |
| 154 | return len; |
| 155 | |
Wei Liu | 5c80700 | 2014-08-12 11:59:29 +0100 | [diff] [blame] | 156 | write[len] = '\0'; |
| 157 | |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 158 | if (!strncmp(write, XENVIF_KICK_STR, sizeof(XENVIF_KICK_STR) - 1)) |
| 159 | xenvif_interrupt(0, (void *)queue); |
| 160 | else { |
| 161 | pr_warn("Unknown command to io_ring_q%d. Available: kick\n", |
| 162 | queue->id); |
| 163 | count = -EINVAL; |
| 164 | } |
| 165 | return count; |
| 166 | } |
| 167 | |
Paul Durrant | a9339b8 | 2016-10-10 09:30:53 +0100 | [diff] [blame] | 168 | static int xenvif_io_ring_open(struct inode *inode, struct file *filp) |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 169 | { |
| 170 | int ret; |
| 171 | void *queue = NULL; |
| 172 | |
| 173 | if (inode->i_private) |
| 174 | queue = inode->i_private; |
| 175 | ret = single_open(filp, xenvif_read_io_ring, queue); |
| 176 | filp->f_mode |= FMODE_PWRITE; |
| 177 | return ret; |
| 178 | } |
| 179 | |
| 180 | static const struct file_operations xenvif_dbg_io_ring_ops_fops = { |
| 181 | .owner = THIS_MODULE, |
Paul Durrant | a9339b8 | 2016-10-10 09:30:53 +0100 | [diff] [blame] | 182 | .open = xenvif_io_ring_open, |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 183 | .read = seq_read, |
| 184 | .llseek = seq_lseek, |
| 185 | .release = single_release, |
| 186 | .write = xenvif_write_io_ring, |
| 187 | }; |
| 188 | |
Paul Durrant | a9339b8 | 2016-10-10 09:30:53 +0100 | [diff] [blame] | 189 | static int xenvif_read_ctrl(struct seq_file *m, void *v) |
| 190 | { |
| 191 | struct xenvif *vif = m->private; |
| 192 | |
| 193 | xenvif_dump_hash_info(vif, m); |
| 194 | |
| 195 | return 0; |
| 196 | } |
| 197 | |
| 198 | static int xenvif_ctrl_open(struct inode *inode, struct file *filp) |
| 199 | { |
| 200 | return single_open(filp, xenvif_read_ctrl, inode->i_private); |
| 201 | } |
| 202 | |
| 203 | static const struct file_operations xenvif_dbg_ctrl_ops_fops = { |
| 204 | .owner = THIS_MODULE, |
| 205 | .open = xenvif_ctrl_open, |
| 206 | .read = seq_read, |
| 207 | .llseek = seq_lseek, |
| 208 | .release = single_release, |
| 209 | }; |
| 210 | |
Wei Liu | 628fa76 | 2014-08-12 11:59:30 +0100 | [diff] [blame] | 211 | static void xenvif_debugfs_addif(struct xenvif *vif) |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 212 | { |
| 213 | struct dentry *pfile; |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 214 | int i; |
| 215 | |
| 216 | if (IS_ERR_OR_NULL(xen_netback_dbg_root)) |
| 217 | return; |
| 218 | |
| 219 | vif->xenvif_dbg_root = debugfs_create_dir(vif->dev->name, |
| 220 | xen_netback_dbg_root); |
| 221 | if (!IS_ERR_OR_NULL(vif->xenvif_dbg_root)) { |
| 222 | for (i = 0; i < vif->num_queues; ++i) { |
| 223 | char filename[sizeof("io_ring_q") + 4]; |
| 224 | |
| 225 | snprintf(filename, sizeof(filename), "io_ring_q%d", i); |
| 226 | pfile = debugfs_create_file(filename, |
| 227 | S_IRUSR | S_IWUSR, |
| 228 | vif->xenvif_dbg_root, |
| 229 | &vif->queues[i], |
| 230 | &xenvif_dbg_io_ring_ops_fops); |
| 231 | if (IS_ERR_OR_NULL(pfile)) |
| 232 | pr_warn("Creation of io_ring file returned %ld!\n", |
| 233 | PTR_ERR(pfile)); |
| 234 | } |
Paul Durrant | a9339b8 | 2016-10-10 09:30:53 +0100 | [diff] [blame] | 235 | |
| 236 | if (vif->ctrl_irq) { |
| 237 | pfile = debugfs_create_file("ctrl", |
| 238 | S_IRUSR, |
| 239 | vif->xenvif_dbg_root, |
| 240 | vif, |
| 241 | &xenvif_dbg_ctrl_ops_fops); |
| 242 | if (IS_ERR_OR_NULL(pfile)) |
| 243 | pr_warn("Creation of ctrl file returned %ld!\n", |
| 244 | PTR_ERR(pfile)); |
| 245 | } |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 246 | } else |
| 247 | netdev_warn(vif->dev, |
| 248 | "Creation of vif debugfs dir returned %ld!\n", |
| 249 | PTR_ERR(vif->xenvif_dbg_root)); |
| 250 | } |
| 251 | |
| 252 | static void xenvif_debugfs_delif(struct xenvif *vif) |
| 253 | { |
| 254 | if (IS_ERR_OR_NULL(xen_netback_dbg_root)) |
| 255 | return; |
| 256 | |
| 257 | if (!IS_ERR_OR_NULL(vif->xenvif_dbg_root)) |
| 258 | debugfs_remove_recursive(vif->xenvif_dbg_root); |
| 259 | vif->xenvif_dbg_root = NULL; |
| 260 | } |
| 261 | #endif /* CONFIG_DEBUG_FS */ |
| 262 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 263 | static int netback_remove(struct xenbus_device *dev) |
| 264 | { |
| 265 | struct backend_info *be = dev_get_drvdata(&dev->dev); |
| 266 | |
David Vrabel | dc62cca | 2013-10-07 13:55:19 +0100 | [diff] [blame] | 267 | set_backend_state(be, XenbusStateClosed); |
| 268 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 269 | unregister_hotplug_status_watch(be); |
| 270 | if (be->vif) { |
| 271 | kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE); |
Palik, Imre | edafc13 | 2015-03-19 11:05:42 +0100 | [diff] [blame] | 272 | xen_unregister_watchers(be->vif); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 273 | xenbus_rm(XBT_NIL, dev->nodename, "hotplug-status"); |
Paul Durrant | 279f438 | 2013-09-17 17:46:08 +0100 | [diff] [blame] | 274 | xenvif_free(be->vif); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 275 | be->vif = NULL; |
| 276 | } |
Ian Campbell | 31a4189 | 2015-06-01 11:30:24 +0100 | [diff] [blame] | 277 | kfree(be->hotplug_script); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 278 | kfree(be); |
| 279 | dev_set_drvdata(&dev->dev, NULL); |
| 280 | return 0; |
| 281 | } |
| 282 | |
| 283 | |
| 284 | /** |
| 285 | * Entry point to this code when a new device is created. Allocate the basic |
| 286 | * structures and switch to InitWait. |
| 287 | */ |
| 288 | static int netback_probe(struct xenbus_device *dev, |
| 289 | const struct xenbus_device_id *id) |
| 290 | { |
| 291 | const char *message; |
| 292 | struct xenbus_transaction xbt; |
| 293 | int err; |
| 294 | int sg; |
Ian Campbell | 31a4189 | 2015-06-01 11:30:24 +0100 | [diff] [blame] | 295 | const char *script; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 296 | struct backend_info *be = kzalloc(sizeof(struct backend_info), |
| 297 | GFP_KERNEL); |
| 298 | if (!be) { |
| 299 | xenbus_dev_fatal(dev, -ENOMEM, |
| 300 | "allocating backend structure"); |
| 301 | return -ENOMEM; |
| 302 | } |
| 303 | |
| 304 | be->dev = dev; |
| 305 | dev_set_drvdata(&dev->dev, be); |
| 306 | |
Filipe Manco | cce9448 | 2016-09-15 17:10:46 +0200 | [diff] [blame] | 307 | be->state = XenbusStateInitialising; |
| 308 | err = xenbus_switch_state(dev, XenbusStateInitialising); |
| 309 | if (err) |
| 310 | goto fail; |
| 311 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 312 | sg = 1; |
| 313 | |
| 314 | do { |
| 315 | err = xenbus_transaction_start(&xbt); |
| 316 | if (err) { |
| 317 | xenbus_dev_fatal(dev, err, "starting transaction"); |
| 318 | goto fail; |
| 319 | } |
| 320 | |
| 321 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", sg); |
| 322 | if (err) { |
| 323 | message = "writing feature-sg"; |
| 324 | goto abort_transaction; |
| 325 | } |
| 326 | |
| 327 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", |
| 328 | "%d", sg); |
| 329 | if (err) { |
| 330 | message = "writing feature-gso-tcpv4"; |
| 331 | goto abort_transaction; |
| 332 | } |
| 333 | |
Paul Durrant | a946858 | 2013-10-16 17:50:31 +0100 | [diff] [blame] | 334 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv6", |
| 335 | "%d", sg); |
| 336 | if (err) { |
| 337 | message = "writing feature-gso-tcpv6"; |
| 338 | goto abort_transaction; |
| 339 | } |
| 340 | |
Paul Durrant | 2eba61d | 2013-10-16 17:50:29 +0100 | [diff] [blame] | 341 | /* We support partial checksum setup for IPv6 packets */ |
| 342 | err = xenbus_printf(xbt, dev->nodename, |
| 343 | "feature-ipv6-csum-offload", |
| 344 | "%d", 1); |
| 345 | if (err) { |
| 346 | message = "writing feature-ipv6-csum-offload"; |
| 347 | goto abort_transaction; |
| 348 | } |
| 349 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 350 | /* We support rx-copy path. */ |
| 351 | err = xenbus_printf(xbt, dev->nodename, |
| 352 | "feature-rx-copy", "%d", 1); |
| 353 | if (err) { |
| 354 | message = "writing feature-rx-copy"; |
| 355 | goto abort_transaction; |
| 356 | } |
| 357 | |
| 358 | /* |
| 359 | * We don't support rx-flip path (except old guests who don't |
| 360 | * grok this feature flag). |
| 361 | */ |
| 362 | err = xenbus_printf(xbt, dev->nodename, |
| 363 | "feature-rx-flip", "%d", 0); |
| 364 | if (err) { |
| 365 | message = "writing feature-rx-flip"; |
| 366 | goto abort_transaction; |
| 367 | } |
| 368 | |
Paul Durrant | 22fae97 | 2016-02-02 11:55:05 +0000 | [diff] [blame] | 369 | /* We support dynamic multicast-control. */ |
Paul Durrant | 210c34d | 2015-09-02 17:58:36 +0100 | [diff] [blame] | 370 | err = xenbus_printf(xbt, dev->nodename, |
| 371 | "feature-multicast-control", "%d", 1); |
| 372 | if (err) { |
| 373 | message = "writing feature-multicast-control"; |
| 374 | goto abort_transaction; |
| 375 | } |
| 376 | |
Paul Durrant | 22fae97 | 2016-02-02 11:55:05 +0000 | [diff] [blame] | 377 | err = xenbus_printf(xbt, dev->nodename, |
| 378 | "feature-dynamic-multicast-control", |
| 379 | "%d", 1); |
| 380 | if (err) { |
| 381 | message = "writing feature-dynamic-multicast-control"; |
| 382 | goto abort_transaction; |
| 383 | } |
| 384 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 385 | err = xenbus_transaction_end(xbt, 0); |
| 386 | } while (err == -EAGAIN); |
| 387 | |
| 388 | if (err) { |
| 389 | xenbus_dev_fatal(dev, err, "completing transaction"); |
| 390 | goto fail; |
| 391 | } |
| 392 | |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 393 | /* |
| 394 | * Split event channels support, this is optional so it is not |
| 395 | * put inside the above loop. |
| 396 | */ |
| 397 | err = xenbus_printf(XBT_NIL, dev->nodename, |
| 398 | "feature-split-event-channels", |
| 399 | "%u", separate_tx_rx_irq); |
| 400 | if (err) |
Wei Liu | 8ef2c3b | 2013-07-02 00:08:54 +0100 | [diff] [blame] | 401 | pr_debug("Error writing feature-split-event-channels\n"); |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 402 | |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 403 | /* Multi-queue support: This is an optional feature. */ |
| 404 | err = xenbus_printf(XBT_NIL, dev->nodename, |
| 405 | "multi-queue-max-queues", "%u", xenvif_max_queues); |
| 406 | if (err) |
| 407 | pr_debug("Error writing multi-queue-max-queues\n"); |
| 408 | |
Paul Durrant | 4e15ee2 | 2016-05-13 09:37:26 +0100 | [diff] [blame] | 409 | err = xenbus_printf(XBT_NIL, dev->nodename, |
| 410 | "feature-ctrl-ring", |
| 411 | "%u", true); |
| 412 | if (err) |
| 413 | pr_debug("Error writing feature-ctrl-ring\n"); |
| 414 | |
Ian Campbell | 31a4189 | 2015-06-01 11:30:24 +0100 | [diff] [blame] | 415 | script = xenbus_read(XBT_NIL, dev->nodename, "script", NULL); |
| 416 | if (IS_ERR(script)) { |
| 417 | err = PTR_ERR(script); |
| 418 | xenbus_dev_fatal(dev, err, "reading script"); |
| 419 | goto fail; |
| 420 | } |
| 421 | |
| 422 | be->hotplug_script = script; |
| 423 | |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 424 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 425 | /* This kicks hotplug scripts, so do it immediately. */ |
Alexey Khoroshilov | 2dd3433 | 2014-11-24 13:58:00 +0300 | [diff] [blame] | 426 | err = backend_create_xenvif(be); |
| 427 | if (err) |
| 428 | goto fail; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 429 | |
| 430 | return 0; |
| 431 | |
| 432 | abort_transaction: |
| 433 | xenbus_transaction_end(xbt, 1); |
| 434 | xenbus_dev_fatal(dev, err, "%s", message); |
| 435 | fail: |
Wei Liu | 8ef2c3b | 2013-07-02 00:08:54 +0100 | [diff] [blame] | 436 | pr_debug("failed\n"); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 437 | netback_remove(dev); |
| 438 | return err; |
| 439 | } |
| 440 | |
| 441 | |
| 442 | /* |
| 443 | * Handle the creation of the hotplug script environment. We add the script |
| 444 | * and vif variables to the environment, for the benefit of the vif-* hotplug |
| 445 | * scripts. |
| 446 | */ |
| 447 | static int netback_uevent(struct xenbus_device *xdev, |
| 448 | struct kobj_uevent_env *env) |
| 449 | { |
| 450 | struct backend_info *be = dev_get_drvdata(&xdev->dev); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 451 | |
Ian Campbell | 31a4189 | 2015-06-01 11:30:24 +0100 | [diff] [blame] | 452 | if (!be) |
| 453 | return 0; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 454 | |
Ian Campbell | 31a4189 | 2015-06-01 11:30:24 +0100 | [diff] [blame] | 455 | if (add_uevent_var(env, "script=%s", be->hotplug_script)) |
| 456 | return -ENOMEM; |
| 457 | |
| 458 | if (!be->vif) |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 459 | return 0; |
| 460 | |
| 461 | return add_uevent_var(env, "vif=%s", be->vif->dev->name); |
| 462 | } |
| 463 | |
| 464 | |
Alexey Khoroshilov | 2dd3433 | 2014-11-24 13:58:00 +0300 | [diff] [blame] | 465 | static int backend_create_xenvif(struct backend_info *be) |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 466 | { |
| 467 | int err; |
| 468 | long handle; |
| 469 | struct xenbus_device *dev = be->dev; |
Jan Beulich | f15650b | 2014-12-09 11:47:04 +0000 | [diff] [blame] | 470 | struct xenvif *vif; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 471 | |
| 472 | if (be->vif != NULL) |
Alexey Khoroshilov | 2dd3433 | 2014-11-24 13:58:00 +0300 | [diff] [blame] | 473 | return 0; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 474 | |
| 475 | err = xenbus_scanf(XBT_NIL, dev->nodename, "handle", "%li", &handle); |
| 476 | if (err != 1) { |
| 477 | xenbus_dev_fatal(dev, err, "reading handle"); |
Alexey Khoroshilov | 2dd3433 | 2014-11-24 13:58:00 +0300 | [diff] [blame] | 478 | return (err < 0) ? err : -EINVAL; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 479 | } |
| 480 | |
Jan Beulich | f15650b | 2014-12-09 11:47:04 +0000 | [diff] [blame] | 481 | vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle); |
| 482 | if (IS_ERR(vif)) { |
| 483 | err = PTR_ERR(vif); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 484 | xenbus_dev_fatal(dev, err, "creating interface"); |
Alexey Khoroshilov | 2dd3433 | 2014-11-24 13:58:00 +0300 | [diff] [blame] | 485 | return err; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 486 | } |
Jan Beulich | f15650b | 2014-12-09 11:47:04 +0000 | [diff] [blame] | 487 | be->vif = vif; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 488 | |
| 489 | kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE); |
Alexey Khoroshilov | 2dd3433 | 2014-11-24 13:58:00 +0300 | [diff] [blame] | 490 | return 0; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 491 | } |
| 492 | |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 493 | static void backend_disconnect(struct backend_info *be) |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 494 | { |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 495 | if (be->vif) { |
Palik, Imre | edafc13 | 2015-03-19 11:05:42 +0100 | [diff] [blame] | 496 | xen_unregister_watchers(be->vif); |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 497 | #ifdef CONFIG_DEBUG_FS |
| 498 | xenvif_debugfs_delif(be->vif); |
| 499 | #endif /* CONFIG_DEBUG_FS */ |
Paul Durrant | 4e15ee2 | 2016-05-13 09:37:26 +0100 | [diff] [blame] | 500 | xenvif_disconnect_data(be->vif); |
| 501 | xenvif_disconnect_ctrl(be->vif); |
Zoltan Kiss | f51de24 | 2014-07-08 19:49:14 +0100 | [diff] [blame] | 502 | } |
Paul Durrant | 279f438 | 2013-09-17 17:46:08 +0100 | [diff] [blame] | 503 | } |
| 504 | |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 505 | static void backend_connect(struct backend_info *be) |
Paul Durrant | 279f438 | 2013-09-17 17:46:08 +0100 | [diff] [blame] | 506 | { |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 507 | if (be->vif) |
| 508 | connect(be); |
| 509 | } |
Paul Durrant | 279f438 | 2013-09-17 17:46:08 +0100 | [diff] [blame] | 510 | |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 511 | static inline void backend_switch_state(struct backend_info *be, |
| 512 | enum xenbus_state state) |
| 513 | { |
| 514 | struct xenbus_device *dev = be->dev; |
| 515 | |
| 516 | pr_debug("%s -> %s\n", dev->nodename, xenbus_strstate(state)); |
| 517 | be->state = state; |
| 518 | |
| 519 | /* If we are waiting for a hotplug script then defer the |
| 520 | * actual xenbus state change. |
| 521 | */ |
| 522 | if (!be->have_hotplug_status_watch) |
| 523 | xenbus_switch_state(dev, state); |
| 524 | } |
| 525 | |
| 526 | /* Handle backend state transitions: |
| 527 | * |
Filipe Manco | cce9448 | 2016-09-15 17:10:46 +0200 | [diff] [blame] | 528 | * The backend state starts in Initialising and the following transitions are |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 529 | * allowed. |
| 530 | * |
Filipe Manco | cce9448 | 2016-09-15 17:10:46 +0200 | [diff] [blame] | 531 | * Initialising -> InitWait -> Connected |
| 532 | * \ |
| 533 | * \ ^ \ | |
| 534 | * \ | \ | |
| 535 | * \ | \ | |
| 536 | * \ | \ | |
| 537 | * \ | \ | |
| 538 | * \ | \ | |
| 539 | * V | V V |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 540 | * |
Filipe Manco | cce9448 | 2016-09-15 17:10:46 +0200 | [diff] [blame] | 541 | * Closed <-> Closing |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 542 | * |
| 543 | * The state argument specifies the eventual state of the backend and the |
| 544 | * function transitions to that state via the shortest path. |
| 545 | */ |
| 546 | static void set_backend_state(struct backend_info *be, |
| 547 | enum xenbus_state state) |
| 548 | { |
| 549 | while (be->state != state) { |
| 550 | switch (be->state) { |
Filipe Manco | cce9448 | 2016-09-15 17:10:46 +0200 | [diff] [blame] | 551 | case XenbusStateInitialising: |
| 552 | switch (state) { |
| 553 | case XenbusStateInitWait: |
| 554 | case XenbusStateConnected: |
| 555 | case XenbusStateClosing: |
| 556 | backend_switch_state(be, XenbusStateInitWait); |
| 557 | break; |
| 558 | case XenbusStateClosed: |
| 559 | backend_switch_state(be, XenbusStateClosed); |
| 560 | break; |
| 561 | default: |
| 562 | BUG(); |
| 563 | } |
| 564 | break; |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 565 | case XenbusStateClosed: |
| 566 | switch (state) { |
| 567 | case XenbusStateInitWait: |
| 568 | case XenbusStateConnected: |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 569 | backend_switch_state(be, XenbusStateInitWait); |
| 570 | break; |
| 571 | case XenbusStateClosing: |
| 572 | backend_switch_state(be, XenbusStateClosing); |
| 573 | break; |
| 574 | default: |
| 575 | BUG(); |
| 576 | } |
| 577 | break; |
| 578 | case XenbusStateInitWait: |
| 579 | switch (state) { |
| 580 | case XenbusStateConnected: |
| 581 | backend_connect(be); |
| 582 | backend_switch_state(be, XenbusStateConnected); |
| 583 | break; |
| 584 | case XenbusStateClosing: |
| 585 | case XenbusStateClosed: |
| 586 | backend_switch_state(be, XenbusStateClosing); |
| 587 | break; |
| 588 | default: |
| 589 | BUG(); |
| 590 | } |
| 591 | break; |
| 592 | case XenbusStateConnected: |
| 593 | switch (state) { |
| 594 | case XenbusStateInitWait: |
| 595 | case XenbusStateClosing: |
| 596 | case XenbusStateClosed: |
| 597 | backend_disconnect(be); |
| 598 | backend_switch_state(be, XenbusStateClosing); |
| 599 | break; |
| 600 | default: |
| 601 | BUG(); |
| 602 | } |
| 603 | break; |
| 604 | case XenbusStateClosing: |
| 605 | switch (state) { |
| 606 | case XenbusStateInitWait: |
| 607 | case XenbusStateConnected: |
| 608 | case XenbusStateClosed: |
| 609 | backend_switch_state(be, XenbusStateClosed); |
| 610 | break; |
| 611 | default: |
| 612 | BUG(); |
| 613 | } |
| 614 | break; |
| 615 | default: |
| 616 | BUG(); |
| 617 | } |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 618 | } |
| 619 | } |
| 620 | |
| 621 | /** |
| 622 | * Callback received when the frontend's state changes. |
| 623 | */ |
| 624 | static void frontend_changed(struct xenbus_device *dev, |
| 625 | enum xenbus_state frontend_state) |
| 626 | { |
| 627 | struct backend_info *be = dev_get_drvdata(&dev->dev); |
| 628 | |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 629 | pr_debug("%s -> %s\n", dev->otherend, xenbus_strstate(frontend_state)); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 630 | |
| 631 | be->frontend_state = frontend_state; |
| 632 | |
| 633 | switch (frontend_state) { |
| 634 | case XenbusStateInitialising: |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 635 | set_backend_state(be, XenbusStateInitWait); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 636 | break; |
| 637 | |
| 638 | case XenbusStateInitialised: |
| 639 | break; |
| 640 | |
| 641 | case XenbusStateConnected: |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 642 | set_backend_state(be, XenbusStateConnected); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 643 | break; |
| 644 | |
| 645 | case XenbusStateClosing: |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 646 | set_backend_state(be, XenbusStateClosing); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 647 | break; |
| 648 | |
| 649 | case XenbusStateClosed: |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 650 | set_backend_state(be, XenbusStateClosed); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 651 | if (xenbus_dev_is_online(dev)) |
| 652 | break; |
| 653 | /* fall through if not online */ |
| 654 | case XenbusStateUnknown: |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 655 | set_backend_state(be, XenbusStateClosed); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 656 | device_unregister(&dev->dev); |
| 657 | break; |
| 658 | |
| 659 | default: |
| 660 | xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", |
| 661 | frontend_state); |
| 662 | break; |
| 663 | } |
| 664 | } |
| 665 | |
| 666 | |
| 667 | static void xen_net_read_rate(struct xenbus_device *dev, |
| 668 | unsigned long *bytes, unsigned long *usec) |
| 669 | { |
| 670 | char *s, *e; |
| 671 | unsigned long b, u; |
| 672 | char *ratestr; |
| 673 | |
| 674 | /* Default to unlimited bandwidth. */ |
| 675 | *bytes = ~0UL; |
| 676 | *usec = 0; |
| 677 | |
| 678 | ratestr = xenbus_read(XBT_NIL, dev->nodename, "rate", NULL); |
| 679 | if (IS_ERR(ratestr)) |
| 680 | return; |
| 681 | |
| 682 | s = ratestr; |
| 683 | b = simple_strtoul(s, &e, 10); |
| 684 | if ((s == e) || (*e != ',')) |
| 685 | goto fail; |
| 686 | |
| 687 | s = e + 1; |
| 688 | u = simple_strtoul(s, &e, 10); |
| 689 | if ((s == e) || (*e != '\0')) |
| 690 | goto fail; |
| 691 | |
| 692 | *bytes = b; |
| 693 | *usec = u; |
| 694 | |
| 695 | kfree(ratestr); |
| 696 | return; |
| 697 | |
| 698 | fail: |
| 699 | pr_warn("Failed to parse network rate limit. Traffic unlimited.\n"); |
| 700 | kfree(ratestr); |
| 701 | } |
| 702 | |
| 703 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) |
| 704 | { |
| 705 | char *s, *e, *macstr; |
| 706 | int i; |
| 707 | |
| 708 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); |
| 709 | if (IS_ERR(macstr)) |
| 710 | return PTR_ERR(macstr); |
| 711 | |
| 712 | for (i = 0; i < ETH_ALEN; i++) { |
| 713 | mac[i] = simple_strtoul(s, &e, 16); |
| 714 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { |
| 715 | kfree(macstr); |
| 716 | return -ENOENT; |
| 717 | } |
| 718 | s = e+1; |
| 719 | } |
| 720 | |
| 721 | kfree(macstr); |
| 722 | return 0; |
| 723 | } |
| 724 | |
Palik, Imre | edafc13 | 2015-03-19 11:05:42 +0100 | [diff] [blame] | 725 | static void xen_net_rate_changed(struct xenbus_watch *watch, |
| 726 | const char **vec, unsigned int len) |
| 727 | { |
| 728 | struct xenvif *vif = container_of(watch, struct xenvif, credit_watch); |
| 729 | struct xenbus_device *dev = xenvif_to_xenbus_device(vif); |
| 730 | unsigned long credit_bytes; |
| 731 | unsigned long credit_usec; |
| 732 | unsigned int queue_index; |
| 733 | |
| 734 | xen_net_read_rate(dev, &credit_bytes, &credit_usec); |
| 735 | for (queue_index = 0; queue_index < vif->num_queues; queue_index++) { |
| 736 | struct xenvif_queue *queue = &vif->queues[queue_index]; |
| 737 | |
| 738 | queue->credit_bytes = credit_bytes; |
| 739 | queue->credit_usec = credit_usec; |
| 740 | if (!mod_timer_pending(&queue->credit_timeout, jiffies) && |
| 741 | queue->remaining_credit > queue->credit_bytes) { |
| 742 | queue->remaining_credit = queue->credit_bytes; |
| 743 | } |
| 744 | } |
| 745 | } |
| 746 | |
Paul Durrant | 22fae97 | 2016-02-02 11:55:05 +0000 | [diff] [blame] | 747 | static int xen_register_credit_watch(struct xenbus_device *dev, |
| 748 | struct xenvif *vif) |
Palik, Imre | edafc13 | 2015-03-19 11:05:42 +0100 | [diff] [blame] | 749 | { |
| 750 | int err = 0; |
| 751 | char *node; |
| 752 | unsigned maxlen = strlen(dev->nodename) + sizeof("/rate"); |
| 753 | |
Palik, Imre | 12b322a | 2015-06-19 14:21:51 +0200 | [diff] [blame] | 754 | if (vif->credit_watch.node) |
| 755 | return -EADDRINUSE; |
| 756 | |
Palik, Imre | edafc13 | 2015-03-19 11:05:42 +0100 | [diff] [blame] | 757 | node = kmalloc(maxlen, GFP_KERNEL); |
| 758 | if (!node) |
| 759 | return -ENOMEM; |
| 760 | snprintf(node, maxlen, "%s/rate", dev->nodename); |
| 761 | vif->credit_watch.node = node; |
| 762 | vif->credit_watch.callback = xen_net_rate_changed; |
| 763 | err = register_xenbus_watch(&vif->credit_watch); |
| 764 | if (err) { |
| 765 | pr_err("Failed to set watcher %s\n", vif->credit_watch.node); |
| 766 | kfree(node); |
| 767 | vif->credit_watch.node = NULL; |
| 768 | vif->credit_watch.callback = NULL; |
| 769 | } |
| 770 | return err; |
| 771 | } |
| 772 | |
Paul Durrant | 22fae97 | 2016-02-02 11:55:05 +0000 | [diff] [blame] | 773 | static void xen_unregister_credit_watch(struct xenvif *vif) |
Palik, Imre | edafc13 | 2015-03-19 11:05:42 +0100 | [diff] [blame] | 774 | { |
| 775 | if (vif->credit_watch.node) { |
| 776 | unregister_xenbus_watch(&vif->credit_watch); |
| 777 | kfree(vif->credit_watch.node); |
| 778 | vif->credit_watch.node = NULL; |
| 779 | } |
| 780 | } |
| 781 | |
Paul Durrant | 22fae97 | 2016-02-02 11:55:05 +0000 | [diff] [blame] | 782 | static void xen_mcast_ctrl_changed(struct xenbus_watch *watch, |
| 783 | const char **vec, unsigned int len) |
| 784 | { |
| 785 | struct xenvif *vif = container_of(watch, struct xenvif, |
| 786 | mcast_ctrl_watch); |
| 787 | struct xenbus_device *dev = xenvif_to_xenbus_device(vif); |
Paul Durrant | 22fae97 | 2016-02-02 11:55:05 +0000 | [diff] [blame] | 788 | |
Juergen Gross | f95842e | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 789 | vif->multicast_control = !!xenbus_read_unsigned(dev->otherend, |
| 790 | "request-multicast-control", 0); |
Paul Durrant | 22fae97 | 2016-02-02 11:55:05 +0000 | [diff] [blame] | 791 | } |
| 792 | |
| 793 | static int xen_register_mcast_ctrl_watch(struct xenbus_device *dev, |
| 794 | struct xenvif *vif) |
| 795 | { |
| 796 | int err = 0; |
| 797 | char *node; |
| 798 | unsigned maxlen = strlen(dev->otherend) + |
| 799 | sizeof("/request-multicast-control"); |
| 800 | |
| 801 | if (vif->mcast_ctrl_watch.node) { |
| 802 | pr_err_ratelimited("Watch is already registered\n"); |
| 803 | return -EADDRINUSE; |
| 804 | } |
| 805 | |
| 806 | node = kmalloc(maxlen, GFP_KERNEL); |
| 807 | if (!node) { |
| 808 | pr_err("Failed to allocate memory for watch\n"); |
| 809 | return -ENOMEM; |
| 810 | } |
| 811 | snprintf(node, maxlen, "%s/request-multicast-control", |
| 812 | dev->otherend); |
| 813 | vif->mcast_ctrl_watch.node = node; |
| 814 | vif->mcast_ctrl_watch.callback = xen_mcast_ctrl_changed; |
| 815 | err = register_xenbus_watch(&vif->mcast_ctrl_watch); |
| 816 | if (err) { |
| 817 | pr_err("Failed to set watcher %s\n", |
| 818 | vif->mcast_ctrl_watch.node); |
| 819 | kfree(node); |
| 820 | vif->mcast_ctrl_watch.node = NULL; |
| 821 | vif->mcast_ctrl_watch.callback = NULL; |
| 822 | } |
| 823 | return err; |
| 824 | } |
| 825 | |
| 826 | static void xen_unregister_mcast_ctrl_watch(struct xenvif *vif) |
| 827 | { |
| 828 | if (vif->mcast_ctrl_watch.node) { |
| 829 | unregister_xenbus_watch(&vif->mcast_ctrl_watch); |
| 830 | kfree(vif->mcast_ctrl_watch.node); |
| 831 | vif->mcast_ctrl_watch.node = NULL; |
| 832 | } |
| 833 | } |
| 834 | |
| 835 | static void xen_register_watchers(struct xenbus_device *dev, |
| 836 | struct xenvif *vif) |
| 837 | { |
| 838 | xen_register_credit_watch(dev, vif); |
| 839 | xen_register_mcast_ctrl_watch(dev, vif); |
| 840 | } |
| 841 | |
| 842 | static void xen_unregister_watchers(struct xenvif *vif) |
| 843 | { |
| 844 | xen_unregister_mcast_ctrl_watch(vif); |
| 845 | xen_unregister_credit_watch(vif); |
| 846 | } |
| 847 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 848 | static void unregister_hotplug_status_watch(struct backend_info *be) |
| 849 | { |
| 850 | if (be->have_hotplug_status_watch) { |
| 851 | unregister_xenbus_watch(&be->hotplug_status_watch); |
| 852 | kfree(be->hotplug_status_watch.node); |
| 853 | } |
| 854 | be->have_hotplug_status_watch = 0; |
| 855 | } |
| 856 | |
| 857 | static void hotplug_status_changed(struct xenbus_watch *watch, |
| 858 | const char **vec, |
| 859 | unsigned int vec_size) |
| 860 | { |
| 861 | struct backend_info *be = container_of(watch, |
| 862 | struct backend_info, |
| 863 | hotplug_status_watch); |
| 864 | char *str; |
| 865 | unsigned int len; |
| 866 | |
| 867 | str = xenbus_read(XBT_NIL, be->dev->nodename, "hotplug-status", &len); |
| 868 | if (IS_ERR(str)) |
| 869 | return; |
| 870 | if (len == sizeof("connected")-1 && !memcmp(str, "connected", len)) { |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 871 | /* Complete any pending state change */ |
| 872 | xenbus_switch_state(be->dev, be->state); |
| 873 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 874 | /* Not interested in this watch anymore. */ |
| 875 | unregister_hotplug_status_watch(be); |
| 876 | } |
| 877 | kfree(str); |
| 878 | } |
| 879 | |
Paul Durrant | 4e15ee2 | 2016-05-13 09:37:26 +0100 | [diff] [blame] | 880 | static int connect_ctrl_ring(struct backend_info *be) |
| 881 | { |
| 882 | struct xenbus_device *dev = be->dev; |
| 883 | struct xenvif *vif = be->vif; |
| 884 | unsigned int val; |
| 885 | grant_ref_t ring_ref; |
| 886 | unsigned int evtchn; |
| 887 | int err; |
| 888 | |
Jan Beulich | 6c27f99 | 2016-11-08 00:45:53 -0700 | [diff] [blame] | 889 | err = xenbus_scanf(XBT_NIL, dev->otherend, |
| 890 | "ctrl-ring-ref", "%u", &val); |
| 891 | if (err < 0) |
Paul Durrant | 4e15ee2 | 2016-05-13 09:37:26 +0100 | [diff] [blame] | 892 | goto done; /* The frontend does not have a control ring */ |
| 893 | |
| 894 | ring_ref = val; |
| 895 | |
Jan Beulich | 6c27f99 | 2016-11-08 00:45:53 -0700 | [diff] [blame] | 896 | err = xenbus_scanf(XBT_NIL, dev->otherend, |
| 897 | "event-channel-ctrl", "%u", &val); |
| 898 | if (err < 0) { |
Paul Durrant | 4e15ee2 | 2016-05-13 09:37:26 +0100 | [diff] [blame] | 899 | xenbus_dev_fatal(dev, err, |
| 900 | "reading %s/event-channel-ctrl", |
| 901 | dev->otherend); |
| 902 | goto fail; |
| 903 | } |
| 904 | |
| 905 | evtchn = val; |
| 906 | |
| 907 | err = xenvif_connect_ctrl(vif, ring_ref, evtchn); |
| 908 | if (err) { |
| 909 | xenbus_dev_fatal(dev, err, |
| 910 | "mapping shared-frame %u port %u", |
| 911 | ring_ref, evtchn); |
| 912 | goto fail; |
| 913 | } |
| 914 | |
| 915 | done: |
| 916 | return 0; |
| 917 | |
| 918 | fail: |
| 919 | return err; |
| 920 | } |
| 921 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 922 | static void connect(struct backend_info *be) |
| 923 | { |
| 924 | int err; |
| 925 | struct xenbus_device *dev = be->dev; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 926 | unsigned long credit_bytes, credit_usec; |
| 927 | unsigned int queue_index; |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 928 | unsigned int requested_num_queues; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 929 | struct xenvif_queue *queue; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 930 | |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 931 | /* Check whether the frontend requested multiple queues |
| 932 | * and read the number requested. |
| 933 | */ |
Juergen Gross | f95842e | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 934 | requested_num_queues = xenbus_read_unsigned(dev->otherend, |
| 935 | "multi-queue-num-queues", 1); |
| 936 | if (requested_num_queues > xenvif_max_queues) { |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 937 | /* buggy or malicious guest */ |
Arnd Bergmann | 0f06ac3 | 2016-11-10 09:55:42 +0100 | [diff] [blame] | 938 | xenbus_dev_fatal(dev, -EINVAL, |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 939 | "guest requested %u queues, exceeding the maximum of %u.", |
| 940 | requested_num_queues, xenvif_max_queues); |
| 941 | return; |
| 942 | } |
| 943 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 944 | err = xen_net_read_mac(dev, be->vif->fe_dev_addr); |
| 945 | if (err) { |
| 946 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); |
| 947 | return; |
| 948 | } |
| 949 | |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 950 | xen_net_read_rate(dev, &credit_bytes, &credit_usec); |
Palik, Imre | 12b322a | 2015-06-19 14:21:51 +0200 | [diff] [blame] | 951 | xen_unregister_watchers(be->vif); |
Palik, Imre | edafc13 | 2015-03-19 11:05:42 +0100 | [diff] [blame] | 952 | xen_register_watchers(dev, be->vif); |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 953 | read_xenbus_vif_flags(be); |
| 954 | |
Paul Durrant | 4e15ee2 | 2016-05-13 09:37:26 +0100 | [diff] [blame] | 955 | err = connect_ctrl_ring(be); |
| 956 | if (err) { |
| 957 | xenbus_dev_fatal(dev, err, "connecting control ring"); |
| 958 | return; |
| 959 | } |
| 960 | |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 961 | /* Use the number of queues requested by the frontend */ |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 962 | be->vif->queues = vzalloc(requested_num_queues * |
| 963 | sizeof(struct xenvif_queue)); |
Insu Yun | 833b8f1 | 2015-10-15 18:02:28 +0000 | [diff] [blame] | 964 | if (!be->vif->queues) { |
| 965 | xenbus_dev_fatal(dev, -ENOMEM, |
| 966 | "allocating queues"); |
| 967 | return; |
| 968 | } |
| 969 | |
Wei Liu | f7b50c4 | 2014-06-23 10:50:17 +0100 | [diff] [blame] | 970 | be->vif->num_queues = requested_num_queues; |
David Vrabel | ecf08d2 | 2014-10-22 14:08:55 +0100 | [diff] [blame] | 971 | be->vif->stalled_queues = requested_num_queues; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 972 | |
| 973 | for (queue_index = 0; queue_index < requested_num_queues; ++queue_index) { |
| 974 | queue = &be->vif->queues[queue_index]; |
| 975 | queue->vif = be->vif; |
| 976 | queue->id = queue_index; |
| 977 | snprintf(queue->name, sizeof(queue->name), "%s-q%u", |
| 978 | be->vif->dev->name, queue->id); |
| 979 | |
| 980 | err = xenvif_init_queue(queue); |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 981 | if (err) { |
| 982 | /* xenvif_init_queue() cleans up after itself on |
| 983 | * failure, but we need to clean up any previously |
| 984 | * initialised queues. Set num_queues to i so that |
| 985 | * earlier queues can be destroyed using the regular |
| 986 | * disconnect logic. |
| 987 | */ |
Wei Liu | f7b50c4 | 2014-06-23 10:50:17 +0100 | [diff] [blame] | 988 | be->vif->num_queues = queue_index; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 989 | goto err; |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 990 | } |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 991 | |
Ross Lagerwall | ce0e5c5 | 2015-05-27 11:44:32 +0100 | [diff] [blame] | 992 | queue->credit_bytes = credit_bytes; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 993 | queue->remaining_credit = credit_bytes; |
Palik, Imre | 07ff890 | 2015-01-06 16:44:44 +0100 | [diff] [blame] | 994 | queue->credit_usec = credit_usec; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 995 | |
Paul Durrant | 4e15ee2 | 2016-05-13 09:37:26 +0100 | [diff] [blame] | 996 | err = connect_data_rings(be, queue); |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 997 | if (err) { |
Paul Durrant | 4e15ee2 | 2016-05-13 09:37:26 +0100 | [diff] [blame] | 998 | /* connect_data_rings() cleans up after itself on |
| 999 | * failure, but we need to clean up after |
| 1000 | * xenvif_init_queue() here, and also clean up any |
| 1001 | * previously initialised queues. |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 1002 | */ |
| 1003 | xenvif_deinit_queue(queue); |
Wei Liu | f7b50c4 | 2014-06-23 10:50:17 +0100 | [diff] [blame] | 1004 | be->vif->num_queues = queue_index; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 1005 | goto err; |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 1006 | } |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 1007 | } |
| 1008 | |
Wei Liu | 628fa76 | 2014-08-12 11:59:30 +0100 | [diff] [blame] | 1009 | #ifdef CONFIG_DEBUG_FS |
| 1010 | xenvif_debugfs_addif(be->vif); |
| 1011 | #endif /* CONFIG_DEBUG_FS */ |
| 1012 | |
Wei Liu | f7b50c4 | 2014-06-23 10:50:17 +0100 | [diff] [blame] | 1013 | /* Initialisation completed, tell core driver the number of |
| 1014 | * active queues. |
| 1015 | */ |
| 1016 | rtnl_lock(); |
| 1017 | netif_set_real_num_tx_queues(be->vif->dev, requested_num_queues); |
| 1018 | netif_set_real_num_rx_queues(be->vif->dev, requested_num_queues); |
| 1019 | rtnl_unlock(); |
| 1020 | |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 1021 | xenvif_carrier_on(be->vif); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1022 | |
| 1023 | unregister_hotplug_status_watch(be); |
| 1024 | err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch, |
| 1025 | hotplug_status_changed, |
| 1026 | "%s/%s", dev->nodename, "hotplug-status"); |
Paul Durrant | ea732df | 2013-09-26 12:09:52 +0100 | [diff] [blame] | 1027 | if (!err) |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1028 | be->have_hotplug_status_watch = 1; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1029 | |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 1030 | netif_tx_wake_all_queues(be->vif->dev); |
| 1031 | |
| 1032 | return; |
| 1033 | |
| 1034 | err: |
Wei Liu | f7b50c4 | 2014-06-23 10:50:17 +0100 | [diff] [blame] | 1035 | if (be->vif->num_queues > 0) |
Paul Durrant | 4e15ee2 | 2016-05-13 09:37:26 +0100 | [diff] [blame] | 1036 | xenvif_disconnect_data(be->vif); /* Clean up existing queues */ |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 1037 | vfree(be->vif->queues); |
| 1038 | be->vif->queues = NULL; |
Wei Liu | f7b50c4 | 2014-06-23 10:50:17 +0100 | [diff] [blame] | 1039 | be->vif->num_queues = 0; |
Paul Durrant | 4e15ee2 | 2016-05-13 09:37:26 +0100 | [diff] [blame] | 1040 | xenvif_disconnect_ctrl(be->vif); |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 1041 | return; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1042 | } |
| 1043 | |
| 1044 | |
Paul Durrant | 4e15ee2 | 2016-05-13 09:37:26 +0100 | [diff] [blame] | 1045 | static int connect_data_rings(struct backend_info *be, |
| 1046 | struct xenvif_queue *queue) |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1047 | { |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1048 | struct xenbus_device *dev = be->dev; |
Wei Liu | f7b50c4 | 2014-06-23 10:50:17 +0100 | [diff] [blame] | 1049 | unsigned int num_queues = queue->vif->num_queues; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1050 | unsigned long tx_ring_ref, rx_ring_ref; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 1051 | unsigned int tx_evtchn, rx_evtchn; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1052 | int err; |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 1053 | char *xspath; |
| 1054 | size_t xspathsize; |
| 1055 | const size_t xenstore_path_ext_size = 11; /* sufficient for "/queue-NNN" */ |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1056 | |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 1057 | /* If the frontend requested 1 queue, or we have fallen back |
| 1058 | * to single queue due to lack of frontend support for multi- |
| 1059 | * queue, expect the remaining XenStore keys in the toplevel |
| 1060 | * directory. Otherwise, expect them in a subdirectory called |
| 1061 | * queue-N. |
| 1062 | */ |
| 1063 | if (num_queues == 1) { |
| 1064 | xspath = kzalloc(strlen(dev->otherend) + 1, GFP_KERNEL); |
| 1065 | if (!xspath) { |
| 1066 | xenbus_dev_fatal(dev, -ENOMEM, |
| 1067 | "reading ring references"); |
| 1068 | return -ENOMEM; |
| 1069 | } |
| 1070 | strcpy(xspath, dev->otherend); |
| 1071 | } else { |
| 1072 | xspathsize = strlen(dev->otherend) + xenstore_path_ext_size; |
| 1073 | xspath = kzalloc(xspathsize, GFP_KERNEL); |
| 1074 | if (!xspath) { |
| 1075 | xenbus_dev_fatal(dev, -ENOMEM, |
| 1076 | "reading ring references"); |
| 1077 | return -ENOMEM; |
| 1078 | } |
| 1079 | snprintf(xspath, xspathsize, "%s/queue-%u", dev->otherend, |
| 1080 | queue->id); |
| 1081 | } |
| 1082 | |
| 1083 | err = xenbus_gather(XBT_NIL, xspath, |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1084 | "tx-ring-ref", "%lu", &tx_ring_ref, |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 1085 | "rx-ring-ref", "%lu", &rx_ring_ref, NULL); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1086 | if (err) { |
| 1087 | xenbus_dev_fatal(dev, err, |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 1088 | "reading %s/ring-ref", |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 1089 | xspath); |
| 1090 | goto err; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1091 | } |
| 1092 | |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 1093 | /* Try split event channels first, then single event channel. */ |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 1094 | err = xenbus_gather(XBT_NIL, xspath, |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 1095 | "event-channel-tx", "%u", &tx_evtchn, |
| 1096 | "event-channel-rx", "%u", &rx_evtchn, NULL); |
| 1097 | if (err < 0) { |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 1098 | err = xenbus_scanf(XBT_NIL, xspath, |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 1099 | "event-channel", "%u", &tx_evtchn); |
| 1100 | if (err < 0) { |
| 1101 | xenbus_dev_fatal(dev, err, |
| 1102 | "reading %s/event-channel(-tx/rx)", |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 1103 | xspath); |
| 1104 | goto err; |
Wei Liu | e1f00a69 | 2013-05-22 06:34:45 +0000 | [diff] [blame] | 1105 | } |
| 1106 | rx_evtchn = tx_evtchn; |
| 1107 | } |
| 1108 | |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 1109 | /* Map the shared frame, irq etc. */ |
Paul Durrant | 4e15ee2 | 2016-05-13 09:37:26 +0100 | [diff] [blame] | 1110 | err = xenvif_connect_data(queue, tx_ring_ref, rx_ring_ref, |
| 1111 | tx_evtchn, rx_evtchn); |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 1112 | if (err) { |
| 1113 | xenbus_dev_fatal(dev, err, |
| 1114 | "mapping shared-frames %lu/%lu port tx %u rx %u", |
| 1115 | tx_ring_ref, rx_ring_ref, |
| 1116 | tx_evtchn, rx_evtchn); |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 1117 | goto err; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 1118 | } |
| 1119 | |
Andrew J. Bennieston | 8d3d53b | 2014-06-04 10:30:43 +0100 | [diff] [blame] | 1120 | err = 0; |
| 1121 | err: /* Regular return falls through with err == 0 */ |
| 1122 | kfree(xspath); |
| 1123 | return err; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 1124 | } |
| 1125 | |
| 1126 | static int read_xenbus_vif_flags(struct backend_info *be) |
| 1127 | { |
| 1128 | struct xenvif *vif = be->vif; |
| 1129 | struct xenbus_device *dev = be->dev; |
| 1130 | unsigned int rx_copy; |
Juergen Gross | f95842e | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 1131 | int err; |
Wei Liu | e9ce7cb | 2014-06-04 10:30:42 +0100 | [diff] [blame] | 1132 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1133 | err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u", |
| 1134 | &rx_copy); |
| 1135 | if (err == -ENOENT) { |
| 1136 | err = 0; |
| 1137 | rx_copy = 0; |
| 1138 | } |
| 1139 | if (err < 0) { |
| 1140 | xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy", |
| 1141 | dev->otherend); |
| 1142 | return err; |
| 1143 | } |
| 1144 | if (!rx_copy) |
| 1145 | return -EOPNOTSUPP; |
| 1146 | |
Juergen Gross | f95842e | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 1147 | if (!xenbus_read_unsigned(dev->otherend, "feature-rx-notify", 0)) { |
David Vrabel | 26c0e10 | 2014-12-18 11:13:06 +0000 | [diff] [blame] | 1148 | /* - Reduce drain timeout to poll more frequently for |
| 1149 | * Rx requests. |
| 1150 | * - Disable Rx stall detection. |
| 1151 | */ |
| 1152 | be->vif->drain_timeout = msecs_to_jiffies(30); |
| 1153 | be->vif->stall_timeout = 0; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1154 | } |
| 1155 | |
Juergen Gross | f95842e | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 1156 | vif->can_sg = !!xenbus_read_unsigned(dev->otherend, "feature-sg", 0); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1157 | |
Paul Durrant | 82cada2 | 2013-10-16 17:50:32 +0100 | [diff] [blame] | 1158 | vif->gso_mask = 0; |
Paul Durrant | 82cada2 | 2013-10-16 17:50:32 +0100 | [diff] [blame] | 1159 | |
Juergen Gross | f95842e | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 1160 | if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv4", 0)) |
Paul Durrant | 82cada2 | 2013-10-16 17:50:32 +0100 | [diff] [blame] | 1161 | vif->gso_mask |= GSO_BIT(TCPV4); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1162 | |
Juergen Gross | f95842e | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 1163 | if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv6", 0)) |
Paul Durrant | 82cada2 | 2013-10-16 17:50:32 +0100 | [diff] [blame] | 1164 | vif->gso_mask |= GSO_BIT(TCPV6); |
| 1165 | |
Juergen Gross | f95842e | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 1166 | vif->ip_csum = !xenbus_read_unsigned(dev->otherend, |
| 1167 | "feature-no-csum-offload", 0); |
Paul Durrant | 146c8a7 | 2013-10-16 17:50:28 +0100 | [diff] [blame] | 1168 | |
Juergen Gross | f95842e | 2016-10-31 14:58:41 +0100 | [diff] [blame] | 1169 | vif->ipv6_csum = !!xenbus_read_unsigned(dev->otherend, |
| 1170 | "feature-ipv6-csum-offload", 0); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1171 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1172 | return 0; |
| 1173 | } |
| 1174 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1175 | static const struct xenbus_device_id netback_ids[] = { |
| 1176 | { "vif" }, |
| 1177 | { "" } |
| 1178 | }; |
| 1179 | |
David Vrabel | 95afae4 | 2014-09-08 17:30:41 +0100 | [diff] [blame] | 1180 | static struct xenbus_driver netback_driver = { |
| 1181 | .ids = netback_ids, |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1182 | .probe = netback_probe, |
| 1183 | .remove = netback_remove, |
| 1184 | .uevent = netback_uevent, |
| 1185 | .otherend_changed = frontend_changed, |
David Vrabel | 95afae4 | 2014-09-08 17:30:41 +0100 | [diff] [blame] | 1186 | }; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1187 | |
| 1188 | int xenvif_xenbus_init(void) |
| 1189 | { |
Jan Beulich | 73db144 | 2011-12-22 09:08:13 +0000 | [diff] [blame] | 1190 | return xenbus_register_backend(&netback_driver); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1191 | } |
Wei Liu | b103f35 | 2013-05-16 23:26:11 +0000 | [diff] [blame] | 1192 | |
| 1193 | void xenvif_xenbus_fini(void) |
| 1194 | { |
| 1195 | return xenbus_unregister_driver(&netback_driver); |
| 1196 | } |