| 1 | /* File veth.c created by Kyle A. Lucke on Mon Aug 7 2000. */ |
| 2 | /* |
| 3 | * IBM eServer iSeries Virtual Ethernet Device Driver |
| 4 | * Copyright (C) 2001 Kyle A. Lucke (klucke@us.ibm.com), IBM Corp. |
| 5 | * Substantially cleaned up by: |
| 6 | * Copyright (C) 2003 David Gibson <dwg@au1.ibm.com>, IBM Corporation. |
| 7 | * Copyright (C) 2004-2005 Michael Ellerman, IBM Corporation. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License as |
| 11 | * published by the Free Software Foundation; either version 2 of the |
| 12 | * License, or (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 22 | * USA |
| 23 | * |
| 24 | * |
| 25 | * This module implements the virtual ethernet device for iSeries LPAR |
| 26 | * Linux. It uses hypervisor message passing to implement an |
| 27 | * ethernet-like network device communicating between partitions on |
| 28 | * the iSeries. |
| 29 | * |
| 30 | * The iSeries LPAR hypervisor currently allows for up to 16 different |
| 31 | * virtual ethernets. These are all dynamically configurable on |
| 32 | * OS/400 partitions, but dynamic configuration is not supported under |
| 33 | * Linux yet. An ethXX network device will be created for each |
| 34 | * virtual ethernet this partition is connected to. |
| 35 | * |
| 36 | * - This driver is responsible for routing packets to and from other |
| 37 | * partitions. The MAC addresses used by the virtual ethernets |
| 38 | * contains meaning and must not be modified. |
| 39 | * |
| 40 | * - Having 2 virtual ethernets to the same remote partition DOES NOT |
| 41 | * double the available bandwidth. The 2 devices will share the |
| 42 | * available hypervisor bandwidth. |
| 43 | * |
| 44 | * - If you send a packet to your own mac address, it will just be |
| 45 | * dropped, you won't get it on the receive side. |
| 46 | * |
| 47 | * - Multicast is implemented by sending the frame frame to every |
| 48 | * other partition. It is the responsibility of the receiving |
| 49 | * partition to filter the addresses desired. |
| 50 | * |
| 51 | * Tunable parameters: |
| 52 | * |
| 53 | * VETH_NUMBUFFERS: This compile time option defaults to 120. It |
| 54 | * controls how much memory Linux will allocate per remote partition |
| 55 | * it is communicating with. It can be thought of as the maximum |
| 56 | * number of packets outstanding to a remote partition at a time. |
| 57 | */ |
| 58 | |
| 59 | #include <linux/module.h> |
| 60 | #include <linux/types.h> |
| 61 | #include <linux/errno.h> |
| 62 | #include <linux/ioport.h> |
| 63 | #include <linux/kernel.h> |
| 64 | #include <linux/netdevice.h> |
| 65 | #include <linux/etherdevice.h> |
| 66 | #include <linux/skbuff.h> |
| 67 | #include <linux/init.h> |
| 68 | #include <linux/delay.h> |
| 69 | #include <linux/mm.h> |
| 70 | #include <linux/ethtool.h> |
| 71 | #include <linux/if_ether.h> |
| 72 | |
| 73 | #include <asm/abs_addr.h> |
| 74 | #include <asm/iseries/mf.h> |
| 75 | #include <asm/uaccess.h> |
| 76 | #include <asm/firmware.h> |
| 77 | #include <asm/iseries/hv_lp_config.h> |
| 78 | #include <asm/iseries/hv_types.h> |
| 79 | #include <asm/iseries/hv_lp_event.h> |
| 80 | #include <asm/iommu.h> |
| 81 | #include <asm/vio.h> |
| 82 | |
| 83 | #undef DEBUG |
| 84 | |
| 85 | MODULE_AUTHOR("Kyle Lucke <klucke@us.ibm.com>"); |
| 86 | MODULE_DESCRIPTION("iSeries Virtual ethernet driver"); |
| 87 | MODULE_LICENSE("GPL"); |
| 88 | |
| 89 | #define VETH_EVENT_CAP (0) |
| 90 | #define VETH_EVENT_FRAMES (1) |
| 91 | #define VETH_EVENT_MONITOR (2) |
| 92 | #define VETH_EVENT_FRAMES_ACK (3) |
| 93 | |
| 94 | #define VETH_MAX_ACKS_PER_MSG (20) |
| 95 | #define VETH_MAX_FRAMES_PER_MSG (6) |
| 96 | |
| 97 | struct veth_frames_data { |
| 98 | u32 addr[VETH_MAX_FRAMES_PER_MSG]; |
| 99 | u16 len[VETH_MAX_FRAMES_PER_MSG]; |
| 100 | u32 eofmask; |
| 101 | }; |
| 102 | #define VETH_EOF_SHIFT (32-VETH_MAX_FRAMES_PER_MSG) |
| 103 | |
| 104 | struct veth_frames_ack_data { |
| 105 | u16 token[VETH_MAX_ACKS_PER_MSG]; |
| 106 | }; |
| 107 | |
| 108 | struct veth_cap_data { |
| 109 | u8 caps_version; |
| 110 | u8 rsvd1; |
| 111 | u16 num_buffers; |
| 112 | u16 ack_threshold; |
| 113 | u16 rsvd2; |
| 114 | u32 ack_timeout; |
| 115 | u32 rsvd3; |
| 116 | u64 rsvd4[3]; |
| 117 | }; |
| 118 | |
| 119 | struct veth_lpevent { |
| 120 | struct HvLpEvent base_event; |
| 121 | union { |
| 122 | struct veth_cap_data caps_data; |
| 123 | struct veth_frames_data frames_data; |
| 124 | struct veth_frames_ack_data frames_ack_data; |
| 125 | } u; |
| 126 | |
| 127 | }; |
| 128 | |
| 129 | #define DRV_NAME "iseries_veth" |
| 130 | #define DRV_VERSION "2.0" |
| 131 | |
| 132 | #define VETH_NUMBUFFERS (120) |
| 133 | #define VETH_ACKTIMEOUT (1000000) /* microseconds */ |
| 134 | #define VETH_MAX_MCAST (12) |
| 135 | |
| 136 | #define VETH_MAX_MTU (9000) |
| 137 | |
| 138 | #if VETH_NUMBUFFERS < 10 |
| 139 | #define ACK_THRESHOLD (1) |
| 140 | #elif VETH_NUMBUFFERS < 20 |
| 141 | #define ACK_THRESHOLD (4) |
| 142 | #elif VETH_NUMBUFFERS < 40 |
| 143 | #define ACK_THRESHOLD (10) |
| 144 | #else |
| 145 | #define ACK_THRESHOLD (20) |
| 146 | #endif |
| 147 | |
| 148 | #define VETH_STATE_SHUTDOWN (0x0001) |
| 149 | #define VETH_STATE_OPEN (0x0002) |
| 150 | #define VETH_STATE_RESET (0x0004) |
| 151 | #define VETH_STATE_SENTMON (0x0008) |
| 152 | #define VETH_STATE_SENTCAPS (0x0010) |
| 153 | #define VETH_STATE_GOTCAPACK (0x0020) |
| 154 | #define VETH_STATE_GOTCAPS (0x0040) |
| 155 | #define VETH_STATE_SENTCAPACK (0x0080) |
| 156 | #define VETH_STATE_READY (0x0100) |
| 157 | |
| 158 | struct veth_msg { |
| 159 | struct veth_msg *next; |
| 160 | struct veth_frames_data data; |
| 161 | int token; |
| 162 | int in_use; |
| 163 | struct sk_buff *skb; |
| 164 | struct device *dev; |
| 165 | }; |
| 166 | |
| 167 | struct veth_lpar_connection { |
| 168 | HvLpIndex remote_lp; |
| 169 | struct delayed_work statemachine_wq; |
| 170 | struct veth_msg *msgs; |
| 171 | int num_events; |
| 172 | struct veth_cap_data local_caps; |
| 173 | |
| 174 | struct kobject kobject; |
| 175 | struct timer_list ack_timer; |
| 176 | |
| 177 | struct timer_list reset_timer; |
| 178 | unsigned int reset_timeout; |
| 179 | unsigned long last_contact; |
| 180 | int outstanding_tx; |
| 181 | |
| 182 | spinlock_t lock; |
| 183 | unsigned long state; |
| 184 | HvLpInstanceId src_inst; |
| 185 | HvLpInstanceId dst_inst; |
| 186 | struct veth_lpevent cap_event, cap_ack_event; |
| 187 | u16 pending_acks[VETH_MAX_ACKS_PER_MSG]; |
| 188 | u32 num_pending_acks; |
| 189 | |
| 190 | int num_ack_events; |
| 191 | struct veth_cap_data remote_caps; |
| 192 | u32 ack_timeout; |
| 193 | |
| 194 | struct veth_msg *msg_stack_head; |
| 195 | }; |
| 196 | |
| 197 | struct veth_port { |
| 198 | struct device *dev; |
| 199 | u64 mac_addr; |
| 200 | HvLpIndexMap lpar_map; |
| 201 | |
| 202 | /* queue_lock protects the stopped_map and dev's queue. */ |
| 203 | spinlock_t queue_lock; |
| 204 | HvLpIndexMap stopped_map; |
| 205 | |
| 206 | /* mcast_gate protects promiscuous, num_mcast & mcast_addr. */ |
| 207 | rwlock_t mcast_gate; |
| 208 | int promiscuous; |
| 209 | int num_mcast; |
| 210 | u64 mcast_addr[VETH_MAX_MCAST]; |
| 211 | |
| 212 | struct kobject kobject; |
| 213 | }; |
| 214 | |
| 215 | static HvLpIndex this_lp; |
| 216 | static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */ |
| 217 | static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */ |
| 218 | |
| 219 | static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev); |
| 220 | static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *); |
| 221 | static void veth_wake_queues(struct veth_lpar_connection *cnx); |
| 222 | static void veth_stop_queues(struct veth_lpar_connection *cnx); |
| 223 | static void veth_receive(struct veth_lpar_connection *, struct veth_lpevent *); |
| 224 | static void veth_release_connection(struct kobject *kobject); |
| 225 | static void veth_timed_ack(unsigned long ptr); |
| 226 | static void veth_timed_reset(unsigned long ptr); |
| 227 | |
| 228 | /* |
| 229 | * Utility functions |
| 230 | */ |
| 231 | |
| 232 | #define veth_info(fmt, args...) \ |
| 233 | printk(KERN_INFO DRV_NAME ": " fmt, ## args) |
| 234 | |
| 235 | #define veth_error(fmt, args...) \ |
| 236 | printk(KERN_ERR DRV_NAME ": Error: " fmt, ## args) |
| 237 | |
| 238 | #ifdef DEBUG |
| 239 | #define veth_debug(fmt, args...) \ |
| 240 | printk(KERN_DEBUG DRV_NAME ": " fmt, ## args) |
| 241 | #else |
| 242 | #define veth_debug(fmt, args...) do {} while (0) |
| 243 | #endif |
| 244 | |
| 245 | /* You must hold the connection's lock when you call this function. */ |
| 246 | static inline void veth_stack_push(struct veth_lpar_connection *cnx, |
| 247 | struct veth_msg *msg) |
| 248 | { |
| 249 | msg->next = cnx->msg_stack_head; |
| 250 | cnx->msg_stack_head = msg; |
| 251 | } |
| 252 | |
| 253 | /* You must hold the connection's lock when you call this function. */ |
| 254 | static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx) |
| 255 | { |
| 256 | struct veth_msg *msg; |
| 257 | |
| 258 | msg = cnx->msg_stack_head; |
| 259 | if (msg) |
| 260 | cnx->msg_stack_head = cnx->msg_stack_head->next; |
| 261 | |
| 262 | return msg; |
| 263 | } |
| 264 | |
| 265 | /* You must hold the connection's lock when you call this function. */ |
| 266 | static inline int veth_stack_is_empty(struct veth_lpar_connection *cnx) |
| 267 | { |
| 268 | return cnx->msg_stack_head == NULL; |
| 269 | } |
| 270 | |
| 271 | static inline HvLpEvent_Rc |
| 272 | veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype, |
| 273 | HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype, |
| 274 | u64 token, |
| 275 | u64 data1, u64 data2, u64 data3, u64 data4, u64 data5) |
| 276 | { |
| 277 | return HvCallEvent_signalLpEventFast(cnx->remote_lp, |
| 278 | HvLpEvent_Type_VirtualLan, |
| 279 | subtype, ackind, acktype, |
| 280 | cnx->src_inst, |
| 281 | cnx->dst_inst, |
| 282 | token, data1, data2, data3, |
| 283 | data4, data5); |
| 284 | } |
| 285 | |
| 286 | static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx, |
| 287 | u16 subtype, u64 token, void *data) |
| 288 | { |
| 289 | u64 *p = (u64 *) data; |
| 290 | |
| 291 | return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck, |
| 292 | HvLpEvent_AckType_ImmediateAck, |
| 293 | token, p[0], p[1], p[2], p[3], p[4]); |
| 294 | } |
| 295 | |
| 296 | struct veth_allocation { |
| 297 | struct completion c; |
| 298 | int num; |
| 299 | }; |
| 300 | |
| 301 | static void veth_complete_allocation(void *parm, int number) |
| 302 | { |
| 303 | struct veth_allocation *vc = (struct veth_allocation *)parm; |
| 304 | |
| 305 | vc->num = number; |
| 306 | complete(&vc->c); |
| 307 | } |
| 308 | |
| 309 | static int veth_allocate_events(HvLpIndex rlp, int number) |
| 310 | { |
| 311 | struct veth_allocation vc = |
| 312 | { COMPLETION_INITIALIZER_ONSTACK(vc.c), 0 }; |
| 313 | |
| 314 | mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan, |
| 315 | sizeof(struct veth_lpevent), number, |
| 316 | &veth_complete_allocation, &vc); |
| 317 | wait_for_completion(&vc.c); |
| 318 | |
| 319 | return vc.num; |
| 320 | } |
| 321 | |
| 322 | /* |
| 323 | * sysfs support |
| 324 | */ |
| 325 | |
| 326 | struct veth_cnx_attribute { |
| 327 | struct attribute attr; |
| 328 | ssize_t (*show)(struct veth_lpar_connection *, char *buf); |
| 329 | ssize_t (*store)(struct veth_lpar_connection *, const char *buf); |
| 330 | }; |
| 331 | |
| 332 | static ssize_t veth_cnx_attribute_show(struct kobject *kobj, |
| 333 | struct attribute *attr, char *buf) |
| 334 | { |
| 335 | struct veth_cnx_attribute *cnx_attr; |
| 336 | struct veth_lpar_connection *cnx; |
| 337 | |
| 338 | cnx_attr = container_of(attr, struct veth_cnx_attribute, attr); |
| 339 | cnx = container_of(kobj, struct veth_lpar_connection, kobject); |
| 340 | |
| 341 | if (!cnx_attr->show) |
| 342 | return -EIO; |
| 343 | |
| 344 | return cnx_attr->show(cnx, buf); |
| 345 | } |
| 346 | |
| 347 | #define CUSTOM_CNX_ATTR(_name, _format, _expression) \ |
| 348 | static ssize_t _name##_show(struct veth_lpar_connection *cnx, char *buf)\ |
| 349 | { \ |
| 350 | return sprintf(buf, _format, _expression); \ |
| 351 | } \ |
| 352 | struct veth_cnx_attribute veth_cnx_attr_##_name = __ATTR_RO(_name) |
| 353 | |
| 354 | #define SIMPLE_CNX_ATTR(_name) \ |
| 355 | CUSTOM_CNX_ATTR(_name, "%lu\n", (unsigned long)cnx->_name) |
| 356 | |
| 357 | SIMPLE_CNX_ATTR(outstanding_tx); |
| 358 | SIMPLE_CNX_ATTR(remote_lp); |
| 359 | SIMPLE_CNX_ATTR(num_events); |
| 360 | SIMPLE_CNX_ATTR(src_inst); |
| 361 | SIMPLE_CNX_ATTR(dst_inst); |
| 362 | SIMPLE_CNX_ATTR(num_pending_acks); |
| 363 | SIMPLE_CNX_ATTR(num_ack_events); |
| 364 | CUSTOM_CNX_ATTR(ack_timeout, "%d\n", jiffies_to_msecs(cnx->ack_timeout)); |
| 365 | CUSTOM_CNX_ATTR(reset_timeout, "%d\n", jiffies_to_msecs(cnx->reset_timeout)); |
| 366 | CUSTOM_CNX_ATTR(state, "0x%.4lX\n", cnx->state); |
| 367 | CUSTOM_CNX_ATTR(last_contact, "%d\n", cnx->last_contact ? |
| 368 | jiffies_to_msecs(jiffies - cnx->last_contact) : 0); |
| 369 | |
| 370 | #define GET_CNX_ATTR(_name) (&veth_cnx_attr_##_name.attr) |
| 371 | |
| 372 | static struct attribute *veth_cnx_default_attrs[] = { |
| 373 | GET_CNX_ATTR(outstanding_tx), |
| 374 | GET_CNX_ATTR(remote_lp), |
| 375 | GET_CNX_ATTR(num_events), |
| 376 | GET_CNX_ATTR(reset_timeout), |
| 377 | GET_CNX_ATTR(last_contact), |
| 378 | GET_CNX_ATTR(state), |
| 379 | GET_CNX_ATTR(src_inst), |
| 380 | GET_CNX_ATTR(dst_inst), |
| 381 | GET_CNX_ATTR(num_pending_acks), |
| 382 | GET_CNX_ATTR(num_ack_events), |
| 383 | GET_CNX_ATTR(ack_timeout), |
| 384 | NULL |
| 385 | }; |
| 386 | |
| 387 | static struct sysfs_ops veth_cnx_sysfs_ops = { |
| 388 | .show = veth_cnx_attribute_show |
| 389 | }; |
| 390 | |
| 391 | static struct kobj_type veth_lpar_connection_ktype = { |
| 392 | .release = veth_release_connection, |
| 393 | .sysfs_ops = &veth_cnx_sysfs_ops, |
| 394 | .default_attrs = veth_cnx_default_attrs |
| 395 | }; |
| 396 | |
| 397 | struct veth_port_attribute { |
| 398 | struct attribute attr; |
| 399 | ssize_t (*show)(struct veth_port *, char *buf); |
| 400 | ssize_t (*store)(struct veth_port *, const char *buf); |
| 401 | }; |
| 402 | |
| 403 | static ssize_t veth_port_attribute_show(struct kobject *kobj, |
| 404 | struct attribute *attr, char *buf) |
| 405 | { |
| 406 | struct veth_port_attribute *port_attr; |
| 407 | struct veth_port *port; |
| 408 | |
| 409 | port_attr = container_of(attr, struct veth_port_attribute, attr); |
| 410 | port = container_of(kobj, struct veth_port, kobject); |
| 411 | |
| 412 | if (!port_attr->show) |
| 413 | return -EIO; |
| 414 | |
| 415 | return port_attr->show(port, buf); |
| 416 | } |
| 417 | |
| 418 | #define CUSTOM_PORT_ATTR(_name, _format, _expression) \ |
| 419 | static ssize_t _name##_show(struct veth_port *port, char *buf) \ |
| 420 | { \ |
| 421 | return sprintf(buf, _format, _expression); \ |
| 422 | } \ |
| 423 | struct veth_port_attribute veth_port_attr_##_name = __ATTR_RO(_name) |
| 424 | |
| 425 | #define SIMPLE_PORT_ATTR(_name) \ |
| 426 | CUSTOM_PORT_ATTR(_name, "%lu\n", (unsigned long)port->_name) |
| 427 | |
| 428 | SIMPLE_PORT_ATTR(promiscuous); |
| 429 | SIMPLE_PORT_ATTR(num_mcast); |
| 430 | CUSTOM_PORT_ATTR(lpar_map, "0x%X\n", port->lpar_map); |
| 431 | CUSTOM_PORT_ATTR(stopped_map, "0x%X\n", port->stopped_map); |
| 432 | CUSTOM_PORT_ATTR(mac_addr, "0x%llX\n", port->mac_addr); |
| 433 | |
| 434 | #define GET_PORT_ATTR(_name) (&veth_port_attr_##_name.attr) |
| 435 | static struct attribute *veth_port_default_attrs[] = { |
| 436 | GET_PORT_ATTR(mac_addr), |
| 437 | GET_PORT_ATTR(lpar_map), |
| 438 | GET_PORT_ATTR(stopped_map), |
| 439 | GET_PORT_ATTR(promiscuous), |
| 440 | GET_PORT_ATTR(num_mcast), |
| 441 | NULL |
| 442 | }; |
| 443 | |
| 444 | static struct sysfs_ops veth_port_sysfs_ops = { |
| 445 | .show = veth_port_attribute_show |
| 446 | }; |
| 447 | |
| 448 | static struct kobj_type veth_port_ktype = { |
| 449 | .sysfs_ops = &veth_port_sysfs_ops, |
| 450 | .default_attrs = veth_port_default_attrs |
| 451 | }; |
| 452 | |
| 453 | /* |
| 454 | * LPAR connection code |
| 455 | */ |
| 456 | |
| 457 | static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx) |
| 458 | { |
| 459 | schedule_delayed_work(&cnx->statemachine_wq, 0); |
| 460 | } |
| 461 | |
| 462 | static void veth_take_cap(struct veth_lpar_connection *cnx, |
| 463 | struct veth_lpevent *event) |
| 464 | { |
| 465 | unsigned long flags; |
| 466 | |
| 467 | spin_lock_irqsave(&cnx->lock, flags); |
| 468 | /* Receiving caps may mean the other end has just come up, so |
| 469 | * we need to reload the instance ID of the far end */ |
| 470 | cnx->dst_inst = |
| 471 | HvCallEvent_getTargetLpInstanceId(cnx->remote_lp, |
| 472 | HvLpEvent_Type_VirtualLan); |
| 473 | |
| 474 | if (cnx->state & VETH_STATE_GOTCAPS) { |
| 475 | veth_error("Received a second capabilities from LPAR %d.\n", |
| 476 | cnx->remote_lp); |
| 477 | event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable; |
| 478 | HvCallEvent_ackLpEvent((struct HvLpEvent *) event); |
| 479 | } else { |
| 480 | memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event)); |
| 481 | cnx->state |= VETH_STATE_GOTCAPS; |
| 482 | veth_kick_statemachine(cnx); |
| 483 | } |
| 484 | spin_unlock_irqrestore(&cnx->lock, flags); |
| 485 | } |
| 486 | |
| 487 | static void veth_take_cap_ack(struct veth_lpar_connection *cnx, |
| 488 | struct veth_lpevent *event) |
| 489 | { |
| 490 | unsigned long flags; |
| 491 | |
| 492 | spin_lock_irqsave(&cnx->lock, flags); |
| 493 | if (cnx->state & VETH_STATE_GOTCAPACK) { |
| 494 | veth_error("Received a second capabilities ack from LPAR %d.\n", |
| 495 | cnx->remote_lp); |
| 496 | } else { |
| 497 | memcpy(&cnx->cap_ack_event, event, |
| 498 | sizeof(&cnx->cap_ack_event)); |
| 499 | cnx->state |= VETH_STATE_GOTCAPACK; |
| 500 | veth_kick_statemachine(cnx); |
| 501 | } |
| 502 | spin_unlock_irqrestore(&cnx->lock, flags); |
| 503 | } |
| 504 | |
| 505 | static void veth_take_monitor_ack(struct veth_lpar_connection *cnx, |
| 506 | struct veth_lpevent *event) |
| 507 | { |
| 508 | unsigned long flags; |
| 509 | |
| 510 | spin_lock_irqsave(&cnx->lock, flags); |
| 511 | veth_debug("cnx %d: lost connection.\n", cnx->remote_lp); |
| 512 | |
| 513 | /* Avoid kicking the statemachine once we're shutdown. |
| 514 | * It's unnecessary and it could break veth_stop_connection(). */ |
| 515 | |
| 516 | if (! (cnx->state & VETH_STATE_SHUTDOWN)) { |
| 517 | cnx->state |= VETH_STATE_RESET; |
| 518 | veth_kick_statemachine(cnx); |
| 519 | } |
| 520 | spin_unlock_irqrestore(&cnx->lock, flags); |
| 521 | } |
| 522 | |
| 523 | static void veth_handle_ack(struct veth_lpevent *event) |
| 524 | { |
| 525 | HvLpIndex rlp = event->base_event.xTargetLp; |
| 526 | struct veth_lpar_connection *cnx = veth_cnx[rlp]; |
| 527 | |
| 528 | BUG_ON(! cnx); |
| 529 | |
| 530 | switch (event->base_event.xSubtype) { |
| 531 | case VETH_EVENT_CAP: |
| 532 | veth_take_cap_ack(cnx, event); |
| 533 | break; |
| 534 | case VETH_EVENT_MONITOR: |
| 535 | veth_take_monitor_ack(cnx, event); |
| 536 | break; |
| 537 | default: |
| 538 | veth_error("Unknown ack type %d from LPAR %d.\n", |
| 539 | event->base_event.xSubtype, rlp); |
| 540 | }; |
| 541 | } |
| 542 | |
| 543 | static void veth_handle_int(struct veth_lpevent *event) |
| 544 | { |
| 545 | HvLpIndex rlp = event->base_event.xSourceLp; |
| 546 | struct veth_lpar_connection *cnx = veth_cnx[rlp]; |
| 547 | unsigned long flags; |
| 548 | int i, acked = 0; |
| 549 | |
| 550 | BUG_ON(! cnx); |
| 551 | |
| 552 | switch (event->base_event.xSubtype) { |
| 553 | case VETH_EVENT_CAP: |
| 554 | veth_take_cap(cnx, event); |
| 555 | break; |
| 556 | case VETH_EVENT_MONITOR: |
| 557 | /* do nothing... this'll hang out here til we're dead, |
| 558 | * and the hypervisor will return it for us. */ |
| 559 | break; |
| 560 | case VETH_EVENT_FRAMES_ACK: |
| 561 | spin_lock_irqsave(&cnx->lock, flags); |
| 562 | |
| 563 | for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) { |
| 564 | u16 msgnum = event->u.frames_ack_data.token[i]; |
| 565 | |
| 566 | if (msgnum < VETH_NUMBUFFERS) { |
| 567 | veth_recycle_msg(cnx, cnx->msgs + msgnum); |
| 568 | cnx->outstanding_tx--; |
| 569 | acked++; |
| 570 | } |
| 571 | } |
| 572 | |
| 573 | if (acked > 0) { |
| 574 | cnx->last_contact = jiffies; |
| 575 | veth_wake_queues(cnx); |
| 576 | } |
| 577 | |
| 578 | spin_unlock_irqrestore(&cnx->lock, flags); |
| 579 | break; |
| 580 | case VETH_EVENT_FRAMES: |
| 581 | veth_receive(cnx, event); |
| 582 | break; |
| 583 | default: |
| 584 | veth_error("Unknown interrupt type %d from LPAR %d.\n", |
| 585 | event->base_event.xSubtype, rlp); |
| 586 | }; |
| 587 | } |
| 588 | |
| 589 | static void veth_handle_event(struct HvLpEvent *event) |
| 590 | { |
| 591 | struct veth_lpevent *veth_event = (struct veth_lpevent *)event; |
| 592 | |
| 593 | if (hvlpevent_is_ack(event)) |
| 594 | veth_handle_ack(veth_event); |
| 595 | else |
| 596 | veth_handle_int(veth_event); |
| 597 | } |
| 598 | |
| 599 | static int veth_process_caps(struct veth_lpar_connection *cnx) |
| 600 | { |
| 601 | struct veth_cap_data *remote_caps = &cnx->remote_caps; |
| 602 | int num_acks_needed; |
| 603 | |
| 604 | /* Convert timer to jiffies */ |
| 605 | cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000; |
| 606 | |
| 607 | if ( (remote_caps->num_buffers == 0) |
| 608 | || (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG) |
| 609 | || (remote_caps->ack_threshold == 0) |
| 610 | || (cnx->ack_timeout == 0) ) { |
| 611 | veth_error("Received incompatible capabilities from LPAR %d.\n", |
| 612 | cnx->remote_lp); |
| 613 | return HvLpEvent_Rc_InvalidSubtypeData; |
| 614 | } |
| 615 | |
| 616 | num_acks_needed = (remote_caps->num_buffers |
| 617 | / remote_caps->ack_threshold) + 1; |
| 618 | |
| 619 | /* FIXME: locking on num_ack_events? */ |
| 620 | if (cnx->num_ack_events < num_acks_needed) { |
| 621 | int num; |
| 622 | |
| 623 | num = veth_allocate_events(cnx->remote_lp, |
| 624 | num_acks_needed-cnx->num_ack_events); |
| 625 | if (num > 0) |
| 626 | cnx->num_ack_events += num; |
| 627 | |
| 628 | if (cnx->num_ack_events < num_acks_needed) { |
| 629 | veth_error("Couldn't allocate enough ack events " |
| 630 | "for LPAR %d.\n", cnx->remote_lp); |
| 631 | |
| 632 | return HvLpEvent_Rc_BufferNotAvailable; |
| 633 | } |
| 634 | } |
| 635 | |
| 636 | |
| 637 | return HvLpEvent_Rc_Good; |
| 638 | } |
| 639 | |
| 640 | /* FIXME: The gotos here are a bit dubious */ |
| 641 | static void veth_statemachine(struct work_struct *work) |
| 642 | { |
| 643 | struct veth_lpar_connection *cnx = |
| 644 | container_of(work, struct veth_lpar_connection, |
| 645 | statemachine_wq.work); |
| 646 | int rlp = cnx->remote_lp; |
| 647 | int rc; |
| 648 | |
| 649 | spin_lock_irq(&cnx->lock); |
| 650 | |
| 651 | restart: |
| 652 | if (cnx->state & VETH_STATE_RESET) { |
| 653 | if (cnx->state & VETH_STATE_OPEN) |
| 654 | HvCallEvent_closeLpEventPath(cnx->remote_lp, |
| 655 | HvLpEvent_Type_VirtualLan); |
| 656 | |
| 657 | /* |
| 658 | * Reset ack data. This prevents the ack_timer actually |
| 659 | * doing anything, even if it runs one more time when |
| 660 | * we drop the lock below. |
| 661 | */ |
| 662 | memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks)); |
| 663 | cnx->num_pending_acks = 0; |
| 664 | |
| 665 | cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON |
| 666 | | VETH_STATE_OPEN | VETH_STATE_SENTCAPS |
| 667 | | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS |
| 668 | | VETH_STATE_SENTCAPACK | VETH_STATE_READY); |
| 669 | |
| 670 | /* Clean up any leftover messages */ |
| 671 | if (cnx->msgs) { |
| 672 | int i; |
| 673 | for (i = 0; i < VETH_NUMBUFFERS; ++i) |
| 674 | veth_recycle_msg(cnx, cnx->msgs + i); |
| 675 | } |
| 676 | |
| 677 | cnx->outstanding_tx = 0; |
| 678 | veth_wake_queues(cnx); |
| 679 | |
| 680 | /* Drop the lock so we can do stuff that might sleep or |
| 681 | * take other locks. */ |
| 682 | spin_unlock_irq(&cnx->lock); |
| 683 | |
| 684 | del_timer_sync(&cnx->ack_timer); |
| 685 | del_timer_sync(&cnx->reset_timer); |
| 686 | |
| 687 | spin_lock_irq(&cnx->lock); |
| 688 | |
| 689 | if (cnx->state & VETH_STATE_RESET) |
| 690 | goto restart; |
| 691 | |
| 692 | /* Hack, wait for the other end to reset itself. */ |
| 693 | if (! (cnx->state & VETH_STATE_SHUTDOWN)) { |
| 694 | schedule_delayed_work(&cnx->statemachine_wq, 5 * HZ); |
| 695 | goto out; |
| 696 | } |
| 697 | } |
| 698 | |
| 699 | if (cnx->state & VETH_STATE_SHUTDOWN) |
| 700 | /* It's all over, do nothing */ |
| 701 | goto out; |
| 702 | |
| 703 | if ( !(cnx->state & VETH_STATE_OPEN) ) { |
| 704 | if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) ) |
| 705 | goto cant_cope; |
| 706 | |
| 707 | HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan); |
| 708 | cnx->src_inst = |
| 709 | HvCallEvent_getSourceLpInstanceId(rlp, |
| 710 | HvLpEvent_Type_VirtualLan); |
| 711 | cnx->dst_inst = |
| 712 | HvCallEvent_getTargetLpInstanceId(rlp, |
| 713 | HvLpEvent_Type_VirtualLan); |
| 714 | cnx->state |= VETH_STATE_OPEN; |
| 715 | } |
| 716 | |
| 717 | if ( (cnx->state & VETH_STATE_OPEN) |
| 718 | && !(cnx->state & VETH_STATE_SENTMON) ) { |
| 719 | rc = veth_signalevent(cnx, VETH_EVENT_MONITOR, |
| 720 | HvLpEvent_AckInd_DoAck, |
| 721 | HvLpEvent_AckType_DeferredAck, |
| 722 | 0, 0, 0, 0, 0, 0); |
| 723 | |
| 724 | if (rc == HvLpEvent_Rc_Good) { |
| 725 | cnx->state |= VETH_STATE_SENTMON; |
| 726 | } else { |
| 727 | if ( (rc != HvLpEvent_Rc_PartitionDead) |
| 728 | && (rc != HvLpEvent_Rc_PathClosed) ) |
| 729 | veth_error("Error sending monitor to LPAR %d, " |
| 730 | "rc = %d\n", rlp, rc); |
| 731 | |
| 732 | /* Oh well, hope we get a cap from the other |
| 733 | * end and do better when that kicks us */ |
| 734 | goto out; |
| 735 | } |
| 736 | } |
| 737 | |
| 738 | if ( (cnx->state & VETH_STATE_OPEN) |
| 739 | && !(cnx->state & VETH_STATE_SENTCAPS)) { |
| 740 | u64 *rawcap = (u64 *)&cnx->local_caps; |
| 741 | |
| 742 | rc = veth_signalevent(cnx, VETH_EVENT_CAP, |
| 743 | HvLpEvent_AckInd_DoAck, |
| 744 | HvLpEvent_AckType_ImmediateAck, |
| 745 | 0, rawcap[0], rawcap[1], rawcap[2], |
| 746 | rawcap[3], rawcap[4]); |
| 747 | |
| 748 | if (rc == HvLpEvent_Rc_Good) { |
| 749 | cnx->state |= VETH_STATE_SENTCAPS; |
| 750 | } else { |
| 751 | if ( (rc != HvLpEvent_Rc_PartitionDead) |
| 752 | && (rc != HvLpEvent_Rc_PathClosed) ) |
| 753 | veth_error("Error sending caps to LPAR %d, " |
| 754 | "rc = %d\n", rlp, rc); |
| 755 | |
| 756 | /* Oh well, hope we get a cap from the other |
| 757 | * end and do better when that kicks us */ |
| 758 | goto out; |
| 759 | } |
| 760 | } |
| 761 | |
| 762 | if ((cnx->state & VETH_STATE_GOTCAPS) |
| 763 | && !(cnx->state & VETH_STATE_SENTCAPACK)) { |
| 764 | struct veth_cap_data *remote_caps = &cnx->remote_caps; |
| 765 | |
| 766 | memcpy(remote_caps, &cnx->cap_event.u.caps_data, |
| 767 | sizeof(*remote_caps)); |
| 768 | |
| 769 | spin_unlock_irq(&cnx->lock); |
| 770 | rc = veth_process_caps(cnx); |
| 771 | spin_lock_irq(&cnx->lock); |
| 772 | |
| 773 | /* We dropped the lock, so recheck for anything which |
| 774 | * might mess us up */ |
| 775 | if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN)) |
| 776 | goto restart; |
| 777 | |
| 778 | cnx->cap_event.base_event.xRc = rc; |
| 779 | HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event); |
| 780 | if (rc == HvLpEvent_Rc_Good) |
| 781 | cnx->state |= VETH_STATE_SENTCAPACK; |
| 782 | else |
| 783 | goto cant_cope; |
| 784 | } |
| 785 | |
| 786 | if ((cnx->state & VETH_STATE_GOTCAPACK) |
| 787 | && (cnx->state & VETH_STATE_GOTCAPS) |
| 788 | && !(cnx->state & VETH_STATE_READY)) { |
| 789 | if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) { |
| 790 | /* Start the ACK timer */ |
| 791 | cnx->ack_timer.expires = jiffies + cnx->ack_timeout; |
| 792 | add_timer(&cnx->ack_timer); |
| 793 | cnx->state |= VETH_STATE_READY; |
| 794 | } else { |
| 795 | veth_error("Caps rejected by LPAR %d, rc = %d\n", |
| 796 | rlp, cnx->cap_ack_event.base_event.xRc); |
| 797 | goto cant_cope; |
| 798 | } |
| 799 | } |
| 800 | |
| 801 | out: |
| 802 | spin_unlock_irq(&cnx->lock); |
| 803 | return; |
| 804 | |
| 805 | cant_cope: |
| 806 | /* FIXME: we get here if something happens we really can't |
| 807 | * cope with. The link will never work once we get here, and |
| 808 | * all we can do is not lock the rest of the system up */ |
| 809 | veth_error("Unrecoverable error on connection to LPAR %d, shutting down" |
| 810 | " (state = 0x%04lx)\n", rlp, cnx->state); |
| 811 | cnx->state |= VETH_STATE_SHUTDOWN; |
| 812 | spin_unlock_irq(&cnx->lock); |
| 813 | } |
| 814 | |
| 815 | static int veth_init_connection(u8 rlp) |
| 816 | { |
| 817 | struct veth_lpar_connection *cnx; |
| 818 | struct veth_msg *msgs; |
| 819 | int i; |
| 820 | |
| 821 | if ( (rlp == this_lp) |
| 822 | || ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) ) |
| 823 | return 0; |
| 824 | |
| 825 | cnx = kzalloc(sizeof(*cnx), GFP_KERNEL); |
| 826 | if (! cnx) |
| 827 | return -ENOMEM; |
| 828 | |
| 829 | cnx->remote_lp = rlp; |
| 830 | spin_lock_init(&cnx->lock); |
| 831 | INIT_DELAYED_WORK(&cnx->statemachine_wq, veth_statemachine); |
| 832 | |
| 833 | init_timer(&cnx->ack_timer); |
| 834 | cnx->ack_timer.function = veth_timed_ack; |
| 835 | cnx->ack_timer.data = (unsigned long) cnx; |
| 836 | |
| 837 | init_timer(&cnx->reset_timer); |
| 838 | cnx->reset_timer.function = veth_timed_reset; |
| 839 | cnx->reset_timer.data = (unsigned long) cnx; |
| 840 | cnx->reset_timeout = 5 * HZ * (VETH_ACKTIMEOUT / 1000000); |
| 841 | |
| 842 | memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks)); |
| 843 | |
| 844 | veth_cnx[rlp] = cnx; |
| 845 | |
| 846 | /* This gets us 1 reference, which is held on behalf of the driver |
| 847 | * infrastructure. It's released at module unload. */ |
| 848 | kobject_init(&cnx->kobject, &veth_lpar_connection_ktype); |
| 849 | |
| 850 | msgs = kcalloc(VETH_NUMBUFFERS, sizeof(struct veth_msg), GFP_KERNEL); |
| 851 | if (! msgs) { |
| 852 | veth_error("Can't allocate buffers for LPAR %d.\n", rlp); |
| 853 | return -ENOMEM; |
| 854 | } |
| 855 | |
| 856 | cnx->msgs = msgs; |
| 857 | |
| 858 | for (i = 0; i < VETH_NUMBUFFERS; i++) { |
| 859 | msgs[i].token = i; |
| 860 | veth_stack_push(cnx, msgs + i); |
| 861 | } |
| 862 | |
| 863 | cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS); |
| 864 | |
| 865 | if (cnx->num_events < (2 + VETH_NUMBUFFERS)) { |
| 866 | veth_error("Can't allocate enough events for LPAR %d.\n", rlp); |
| 867 | return -ENOMEM; |
| 868 | } |
| 869 | |
| 870 | cnx->local_caps.num_buffers = VETH_NUMBUFFERS; |
| 871 | cnx->local_caps.ack_threshold = ACK_THRESHOLD; |
| 872 | cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT; |
| 873 | |
| 874 | return 0; |
| 875 | } |
| 876 | |
| 877 | static void veth_stop_connection(struct veth_lpar_connection *cnx) |
| 878 | { |
| 879 | if (!cnx) |
| 880 | return; |
| 881 | |
| 882 | spin_lock_irq(&cnx->lock); |
| 883 | cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN; |
| 884 | veth_kick_statemachine(cnx); |
| 885 | spin_unlock_irq(&cnx->lock); |
| 886 | |
| 887 | /* There's a slim chance the reset code has just queued the |
| 888 | * statemachine to run in five seconds. If so we need to cancel |
| 889 | * that and requeue the work to run now. */ |
| 890 | if (cancel_delayed_work(&cnx->statemachine_wq)) { |
| 891 | spin_lock_irq(&cnx->lock); |
| 892 | veth_kick_statemachine(cnx); |
| 893 | spin_unlock_irq(&cnx->lock); |
| 894 | } |
| 895 | |
| 896 | /* Wait for the state machine to run. */ |
| 897 | flush_scheduled_work(); |
| 898 | } |
| 899 | |
| 900 | static void veth_destroy_connection(struct veth_lpar_connection *cnx) |
| 901 | { |
| 902 | if (!cnx) |
| 903 | return; |
| 904 | |
| 905 | if (cnx->num_events > 0) |
| 906 | mf_deallocate_lp_events(cnx->remote_lp, |
| 907 | HvLpEvent_Type_VirtualLan, |
| 908 | cnx->num_events, |
| 909 | NULL, NULL); |
| 910 | if (cnx->num_ack_events > 0) |
| 911 | mf_deallocate_lp_events(cnx->remote_lp, |
| 912 | HvLpEvent_Type_VirtualLan, |
| 913 | cnx->num_ack_events, |
| 914 | NULL, NULL); |
| 915 | |
| 916 | kfree(cnx->msgs); |
| 917 | veth_cnx[cnx->remote_lp] = NULL; |
| 918 | kfree(cnx); |
| 919 | } |
| 920 | |
| 921 | static void veth_release_connection(struct kobject *kobj) |
| 922 | { |
| 923 | struct veth_lpar_connection *cnx; |
| 924 | cnx = container_of(kobj, struct veth_lpar_connection, kobject); |
| 925 | veth_stop_connection(cnx); |
| 926 | veth_destroy_connection(cnx); |
| 927 | } |
| 928 | |
| 929 | /* |
| 930 | * net_device code |
| 931 | */ |
| 932 | |
| 933 | static int veth_open(struct net_device *dev) |
| 934 | { |
| 935 | netif_start_queue(dev); |
| 936 | return 0; |
| 937 | } |
| 938 | |
| 939 | static int veth_close(struct net_device *dev) |
| 940 | { |
| 941 | netif_stop_queue(dev); |
| 942 | return 0; |
| 943 | } |
| 944 | |
| 945 | static int veth_change_mtu(struct net_device *dev, int new_mtu) |
| 946 | { |
| 947 | if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU)) |
| 948 | return -EINVAL; |
| 949 | dev->mtu = new_mtu; |
| 950 | return 0; |
| 951 | } |
| 952 | |
| 953 | static void veth_set_multicast_list(struct net_device *dev) |
| 954 | { |
| 955 | struct veth_port *port = netdev_priv(dev); |
| 956 | unsigned long flags; |
| 957 | |
| 958 | write_lock_irqsave(&port->mcast_gate, flags); |
| 959 | |
| 960 | if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) || |
| 961 | (dev->mc_count > VETH_MAX_MCAST)) { |
| 962 | port->promiscuous = 1; |
| 963 | } else { |
| 964 | struct dev_mc_list *dmi = dev->mc_list; |
| 965 | int i; |
| 966 | |
| 967 | port->promiscuous = 0; |
| 968 | |
| 969 | /* Update table */ |
| 970 | port->num_mcast = 0; |
| 971 | |
| 972 | for (i = 0; i < dev->mc_count; i++) { |
| 973 | u8 *addr = dmi->dmi_addr; |
| 974 | u64 xaddr = 0; |
| 975 | |
| 976 | if (addr[0] & 0x01) {/* multicast address? */ |
| 977 | memcpy(&xaddr, addr, ETH_ALEN); |
| 978 | port->mcast_addr[port->num_mcast] = xaddr; |
| 979 | port->num_mcast++; |
| 980 | } |
| 981 | dmi = dmi->next; |
| 982 | } |
| 983 | } |
| 984 | |
| 985 | write_unlock_irqrestore(&port->mcast_gate, flags); |
| 986 | } |
| 987 | |
| 988 | static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
| 989 | { |
| 990 | strncpy(info->driver, DRV_NAME, sizeof(info->driver) - 1); |
| 991 | info->driver[sizeof(info->driver) - 1] = '\0'; |
| 992 | strncpy(info->version, DRV_VERSION, sizeof(info->version) - 1); |
| 993 | info->version[sizeof(info->version) - 1] = '\0'; |
| 994 | } |
| 995 | |
| 996 | static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd) |
| 997 | { |
| 998 | ecmd->supported = (SUPPORTED_1000baseT_Full |
| 999 | | SUPPORTED_Autoneg | SUPPORTED_FIBRE); |
| 1000 | ecmd->advertising = (SUPPORTED_1000baseT_Full |
| 1001 | | SUPPORTED_Autoneg | SUPPORTED_FIBRE); |
| 1002 | ecmd->port = PORT_FIBRE; |
| 1003 | ecmd->transceiver = XCVR_INTERNAL; |
| 1004 | ecmd->phy_address = 0; |
| 1005 | ecmd->speed = SPEED_1000; |
| 1006 | ecmd->duplex = DUPLEX_FULL; |
| 1007 | ecmd->autoneg = AUTONEG_ENABLE; |
| 1008 | ecmd->maxtxpkt = 120; |
| 1009 | ecmd->maxrxpkt = 120; |
| 1010 | return 0; |
| 1011 | } |
| 1012 | |
| 1013 | static u32 veth_get_link(struct net_device *dev) |
| 1014 | { |
| 1015 | return 1; |
| 1016 | } |
| 1017 | |
| 1018 | static const struct ethtool_ops ops = { |
| 1019 | .get_drvinfo = veth_get_drvinfo, |
| 1020 | .get_settings = veth_get_settings, |
| 1021 | .get_link = veth_get_link, |
| 1022 | }; |
| 1023 | |
| 1024 | static const struct net_device_ops veth_netdev_ops = { |
| 1025 | .ndo_open = veth_open, |
| 1026 | .ndo_stop = veth_close, |
| 1027 | .ndo_start_xmit = veth_start_xmit, |
| 1028 | .ndo_change_mtu = veth_change_mtu, |
| 1029 | .ndo_set_multicast_list = veth_set_multicast_list, |
| 1030 | .ndo_set_mac_address = NULL, |
| 1031 | .ndo_validate_addr = eth_validate_addr, |
| 1032 | }; |
| 1033 | |
| 1034 | static struct net_device *veth_probe_one(int vlan, |
| 1035 | struct vio_dev *vio_dev) |
| 1036 | { |
| 1037 | struct net_device *dev; |
| 1038 | struct veth_port *port; |
| 1039 | struct device *vdev = &vio_dev->dev; |
| 1040 | int i, rc; |
| 1041 | const unsigned char *mac_addr; |
| 1042 | |
| 1043 | mac_addr = vio_get_attribute(vio_dev, "local-mac-address", NULL); |
| 1044 | if (mac_addr == NULL) |
| 1045 | mac_addr = vio_get_attribute(vio_dev, "mac-address", NULL); |
| 1046 | if (mac_addr == NULL) { |
| 1047 | veth_error("Unable to fetch MAC address from device tree.\n"); |
| 1048 | return NULL; |
| 1049 | } |
| 1050 | |
| 1051 | dev = alloc_etherdev(sizeof (struct veth_port)); |
| 1052 | if (! dev) { |
| 1053 | veth_error("Unable to allocate net_device structure!\n"); |
| 1054 | return NULL; |
| 1055 | } |
| 1056 | |
| 1057 | port = netdev_priv(dev); |
| 1058 | |
| 1059 | spin_lock_init(&port->queue_lock); |
| 1060 | rwlock_init(&port->mcast_gate); |
| 1061 | port->stopped_map = 0; |
| 1062 | |
| 1063 | for (i = 0; i < HVMAXARCHITECTEDLPS; i++) { |
| 1064 | HvLpVirtualLanIndexMap map; |
| 1065 | |
| 1066 | if (i == this_lp) |
| 1067 | continue; |
| 1068 | map = HvLpConfig_getVirtualLanIndexMapForLp(i); |
| 1069 | if (map & (0x8000 >> vlan)) |
| 1070 | port->lpar_map |= (1 << i); |
| 1071 | } |
| 1072 | port->dev = vdev; |
| 1073 | |
| 1074 | memcpy(dev->dev_addr, mac_addr, ETH_ALEN); |
| 1075 | |
| 1076 | dev->mtu = VETH_MAX_MTU; |
| 1077 | |
| 1078 | memcpy(&port->mac_addr, mac_addr, ETH_ALEN); |
| 1079 | |
| 1080 | dev->netdev_ops = &veth_netdev_ops; |
| 1081 | SET_ETHTOOL_OPS(dev, &ops); |
| 1082 | |
| 1083 | SET_NETDEV_DEV(dev, vdev); |
| 1084 | |
| 1085 | rc = register_netdev(dev); |
| 1086 | if (rc != 0) { |
| 1087 | veth_error("Failed registering net device for vlan%d.\n", vlan); |
| 1088 | free_netdev(dev); |
| 1089 | return NULL; |
| 1090 | } |
| 1091 | |
| 1092 | kobject_init(&port->kobject, &veth_port_ktype); |
| 1093 | if (0 != kobject_add(&port->kobject, &dev->dev.kobj, "veth_port")) |
| 1094 | veth_error("Failed adding port for %s to sysfs.\n", dev->name); |
| 1095 | |
| 1096 | veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n", |
| 1097 | dev->name, vlan, port->lpar_map); |
| 1098 | |
| 1099 | return dev; |
| 1100 | } |
| 1101 | |
| 1102 | /* |
| 1103 | * Tx path |
| 1104 | */ |
| 1105 | |
| 1106 | static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp, |
| 1107 | struct net_device *dev) |
| 1108 | { |
| 1109 | struct veth_lpar_connection *cnx = veth_cnx[rlp]; |
| 1110 | struct veth_port *port = netdev_priv(dev); |
| 1111 | HvLpEvent_Rc rc; |
| 1112 | struct veth_msg *msg = NULL; |
| 1113 | unsigned long flags; |
| 1114 | |
| 1115 | if (! cnx) |
| 1116 | return 0; |
| 1117 | |
| 1118 | spin_lock_irqsave(&cnx->lock, flags); |
| 1119 | |
| 1120 | if (! (cnx->state & VETH_STATE_READY)) |
| 1121 | goto no_error; |
| 1122 | |
| 1123 | if ((skb->len - ETH_HLEN) > VETH_MAX_MTU) |
| 1124 | goto drop; |
| 1125 | |
| 1126 | msg = veth_stack_pop(cnx); |
| 1127 | if (! msg) |
| 1128 | goto drop; |
| 1129 | |
| 1130 | msg->in_use = 1; |
| 1131 | msg->skb = skb_get(skb); |
| 1132 | |
| 1133 | msg->data.addr[0] = dma_map_single(port->dev, skb->data, |
| 1134 | skb->len, DMA_TO_DEVICE); |
| 1135 | |
| 1136 | if (dma_mapping_error(port->dev, msg->data.addr[0])) |
| 1137 | goto recycle_and_drop; |
| 1138 | |
| 1139 | msg->dev = port->dev; |
| 1140 | msg->data.len[0] = skb->len; |
| 1141 | msg->data.eofmask = 1 << VETH_EOF_SHIFT; |
| 1142 | |
| 1143 | rc = veth_signaldata(cnx, VETH_EVENT_FRAMES, msg->token, &msg->data); |
| 1144 | |
| 1145 | if (rc != HvLpEvent_Rc_Good) |
| 1146 | goto recycle_and_drop; |
| 1147 | |
| 1148 | /* If the timer's not already running, start it now. */ |
| 1149 | if (0 == cnx->outstanding_tx) |
| 1150 | mod_timer(&cnx->reset_timer, jiffies + cnx->reset_timeout); |
| 1151 | |
| 1152 | cnx->last_contact = jiffies; |
| 1153 | cnx->outstanding_tx++; |
| 1154 | |
| 1155 | if (veth_stack_is_empty(cnx)) |
| 1156 | veth_stop_queues(cnx); |
| 1157 | |
| 1158 | no_error: |
| 1159 | spin_unlock_irqrestore(&cnx->lock, flags); |
| 1160 | return 0; |
| 1161 | |
| 1162 | recycle_and_drop: |
| 1163 | veth_recycle_msg(cnx, msg); |
| 1164 | drop: |
| 1165 | spin_unlock_irqrestore(&cnx->lock, flags); |
| 1166 | return 1; |
| 1167 | } |
| 1168 | |
| 1169 | static void veth_transmit_to_many(struct sk_buff *skb, |
| 1170 | HvLpIndexMap lpmask, |
| 1171 | struct net_device *dev) |
| 1172 | { |
| 1173 | int i, success, error; |
| 1174 | |
| 1175 | success = error = 0; |
| 1176 | |
| 1177 | for (i = 0; i < HVMAXARCHITECTEDLPS; i++) { |
| 1178 | if ((lpmask & (1 << i)) == 0) |
| 1179 | continue; |
| 1180 | |
| 1181 | if (veth_transmit_to_one(skb, i, dev)) |
| 1182 | error = 1; |
| 1183 | else |
| 1184 | success = 1; |
| 1185 | } |
| 1186 | |
| 1187 | if (error) |
| 1188 | dev->stats.tx_errors++; |
| 1189 | |
| 1190 | if (success) { |
| 1191 | dev->stats.tx_packets++; |
| 1192 | dev->stats.tx_bytes += skb->len; |
| 1193 | } |
| 1194 | } |
| 1195 | |
| 1196 | static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| 1197 | { |
| 1198 | unsigned char *frame = skb->data; |
| 1199 | struct veth_port *port = netdev_priv(dev); |
| 1200 | HvLpIndexMap lpmask; |
| 1201 | |
| 1202 | if (! (frame[0] & 0x01)) { |
| 1203 | /* unicast packet */ |
| 1204 | HvLpIndex rlp = frame[5]; |
| 1205 | |
| 1206 | if ( ! ((1 << rlp) & port->lpar_map) ) { |
| 1207 | dev_kfree_skb(skb); |
| 1208 | return NETDEV_TX_OK; |
| 1209 | } |
| 1210 | |
| 1211 | lpmask = 1 << rlp; |
| 1212 | } else { |
| 1213 | lpmask = port->lpar_map; |
| 1214 | } |
| 1215 | |
| 1216 | veth_transmit_to_many(skb, lpmask, dev); |
| 1217 | |
| 1218 | dev_kfree_skb(skb); |
| 1219 | |
| 1220 | return NETDEV_TX_OK; |
| 1221 | } |
| 1222 | |
| 1223 | /* You must hold the connection's lock when you call this function. */ |
| 1224 | static void veth_recycle_msg(struct veth_lpar_connection *cnx, |
| 1225 | struct veth_msg *msg) |
| 1226 | { |
| 1227 | u32 dma_address, dma_length; |
| 1228 | |
| 1229 | if (msg->in_use) { |
| 1230 | msg->in_use = 0; |
| 1231 | dma_address = msg->data.addr[0]; |
| 1232 | dma_length = msg->data.len[0]; |
| 1233 | |
| 1234 | if (!dma_mapping_error(msg->dev, dma_address)) |
| 1235 | dma_unmap_single(msg->dev, dma_address, dma_length, |
| 1236 | DMA_TO_DEVICE); |
| 1237 | |
| 1238 | if (msg->skb) { |
| 1239 | dev_kfree_skb_any(msg->skb); |
| 1240 | msg->skb = NULL; |
| 1241 | } |
| 1242 | |
| 1243 | memset(&msg->data, 0, sizeof(msg->data)); |
| 1244 | veth_stack_push(cnx, msg); |
| 1245 | } else if (cnx->state & VETH_STATE_OPEN) { |
| 1246 | veth_error("Non-pending frame (# %d) acked by LPAR %d.\n", |
| 1247 | cnx->remote_lp, msg->token); |
| 1248 | } |
| 1249 | } |
| 1250 | |
| 1251 | static void veth_wake_queues(struct veth_lpar_connection *cnx) |
| 1252 | { |
| 1253 | int i; |
| 1254 | |
| 1255 | for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) { |
| 1256 | struct net_device *dev = veth_dev[i]; |
| 1257 | struct veth_port *port; |
| 1258 | unsigned long flags; |
| 1259 | |
| 1260 | if (! dev) |
| 1261 | continue; |
| 1262 | |
| 1263 | port = netdev_priv(dev); |
| 1264 | |
| 1265 | if (! (port->lpar_map & (1<<cnx->remote_lp))) |
| 1266 | continue; |
| 1267 | |
| 1268 | spin_lock_irqsave(&port->queue_lock, flags); |
| 1269 | |
| 1270 | port->stopped_map &= ~(1 << cnx->remote_lp); |
| 1271 | |
| 1272 | if (0 == port->stopped_map && netif_queue_stopped(dev)) { |
| 1273 | veth_debug("cnx %d: woke queue for %s.\n", |
| 1274 | cnx->remote_lp, dev->name); |
| 1275 | netif_wake_queue(dev); |
| 1276 | } |
| 1277 | spin_unlock_irqrestore(&port->queue_lock, flags); |
| 1278 | } |
| 1279 | } |
| 1280 | |
| 1281 | static void veth_stop_queues(struct veth_lpar_connection *cnx) |
| 1282 | { |
| 1283 | int i; |
| 1284 | |
| 1285 | for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) { |
| 1286 | struct net_device *dev = veth_dev[i]; |
| 1287 | struct veth_port *port; |
| 1288 | |
| 1289 | if (! dev) |
| 1290 | continue; |
| 1291 | |
| 1292 | port = netdev_priv(dev); |
| 1293 | |
| 1294 | /* If this cnx is not on the vlan for this port, continue */ |
| 1295 | if (! (port->lpar_map & (1 << cnx->remote_lp))) |
| 1296 | continue; |
| 1297 | |
| 1298 | spin_lock(&port->queue_lock); |
| 1299 | |
| 1300 | netif_stop_queue(dev); |
| 1301 | port->stopped_map |= (1 << cnx->remote_lp); |
| 1302 | |
| 1303 | veth_debug("cnx %d: stopped queue for %s, map = 0x%x.\n", |
| 1304 | cnx->remote_lp, dev->name, port->stopped_map); |
| 1305 | |
| 1306 | spin_unlock(&port->queue_lock); |
| 1307 | } |
| 1308 | } |
| 1309 | |
| 1310 | static void veth_timed_reset(unsigned long ptr) |
| 1311 | { |
| 1312 | struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)ptr; |
| 1313 | unsigned long trigger_time, flags; |
| 1314 | |
| 1315 | /* FIXME is it possible this fires after veth_stop_connection()? |
| 1316 | * That would reschedule the statemachine for 5 seconds and probably |
| 1317 | * execute it after the module's been unloaded. Hmm. */ |
| 1318 | |
| 1319 | spin_lock_irqsave(&cnx->lock, flags); |
| 1320 | |
| 1321 | if (cnx->outstanding_tx > 0) { |
| 1322 | trigger_time = cnx->last_contact + cnx->reset_timeout; |
| 1323 | |
| 1324 | if (trigger_time < jiffies) { |
| 1325 | cnx->state |= VETH_STATE_RESET; |
| 1326 | veth_kick_statemachine(cnx); |
| 1327 | veth_error("%d packets not acked by LPAR %d within %d " |
| 1328 | "seconds, resetting.\n", |
| 1329 | cnx->outstanding_tx, cnx->remote_lp, |
| 1330 | cnx->reset_timeout / HZ); |
| 1331 | } else { |
| 1332 | /* Reschedule the timer */ |
| 1333 | trigger_time = jiffies + cnx->reset_timeout; |
| 1334 | mod_timer(&cnx->reset_timer, trigger_time); |
| 1335 | } |
| 1336 | } |
| 1337 | |
| 1338 | spin_unlock_irqrestore(&cnx->lock, flags); |
| 1339 | } |
| 1340 | |
| 1341 | /* |
| 1342 | * Rx path |
| 1343 | */ |
| 1344 | |
| 1345 | static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr) |
| 1346 | { |
| 1347 | int wanted = 0; |
| 1348 | int i; |
| 1349 | unsigned long flags; |
| 1350 | |
| 1351 | if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) ) |
| 1352 | return 1; |
| 1353 | |
| 1354 | read_lock_irqsave(&port->mcast_gate, flags); |
| 1355 | |
| 1356 | if (port->promiscuous) { |
| 1357 | wanted = 1; |
| 1358 | goto out; |
| 1359 | } |
| 1360 | |
| 1361 | for (i = 0; i < port->num_mcast; ++i) { |
| 1362 | if (port->mcast_addr[i] == mac_addr) { |
| 1363 | wanted = 1; |
| 1364 | break; |
| 1365 | } |
| 1366 | } |
| 1367 | |
| 1368 | out: |
| 1369 | read_unlock_irqrestore(&port->mcast_gate, flags); |
| 1370 | |
| 1371 | return wanted; |
| 1372 | } |
| 1373 | |
| 1374 | struct dma_chunk { |
| 1375 | u64 addr; |
| 1376 | u64 size; |
| 1377 | }; |
| 1378 | |
| 1379 | #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 ) |
| 1380 | |
| 1381 | static inline void veth_build_dma_list(struct dma_chunk *list, |
| 1382 | unsigned char *p, unsigned long length) |
| 1383 | { |
| 1384 | unsigned long done; |
| 1385 | int i = 1; |
| 1386 | |
| 1387 | /* FIXME: skbs are continguous in real addresses. Do we |
| 1388 | * really need to break it into PAGE_SIZE chunks, or can we do |
| 1389 | * it just at the granularity of iSeries real->absolute |
| 1390 | * mapping? Indeed, given the way the allocator works, can we |
| 1391 | * count on them being absolutely contiguous? */ |
| 1392 | list[0].addr = iseries_hv_addr(p); |
| 1393 | list[0].size = min(length, |
| 1394 | PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK)); |
| 1395 | |
| 1396 | done = list[0].size; |
| 1397 | while (done < length) { |
| 1398 | list[i].addr = iseries_hv_addr(p + done); |
| 1399 | list[i].size = min(length-done, PAGE_SIZE); |
| 1400 | done += list[i].size; |
| 1401 | i++; |
| 1402 | } |
| 1403 | } |
| 1404 | |
| 1405 | static void veth_flush_acks(struct veth_lpar_connection *cnx) |
| 1406 | { |
| 1407 | HvLpEvent_Rc rc; |
| 1408 | |
| 1409 | rc = veth_signaldata(cnx, VETH_EVENT_FRAMES_ACK, |
| 1410 | 0, &cnx->pending_acks); |
| 1411 | |
| 1412 | if (rc != HvLpEvent_Rc_Good) |
| 1413 | veth_error("Failed acking frames from LPAR %d, rc = %d\n", |
| 1414 | cnx->remote_lp, (int)rc); |
| 1415 | |
| 1416 | cnx->num_pending_acks = 0; |
| 1417 | memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks)); |
| 1418 | } |
| 1419 | |
| 1420 | static void veth_receive(struct veth_lpar_connection *cnx, |
| 1421 | struct veth_lpevent *event) |
| 1422 | { |
| 1423 | struct veth_frames_data *senddata = &event->u.frames_data; |
| 1424 | int startchunk = 0; |
| 1425 | int nchunks; |
| 1426 | unsigned long flags; |
| 1427 | HvLpDma_Rc rc; |
| 1428 | |
| 1429 | do { |
| 1430 | u16 length = 0; |
| 1431 | struct sk_buff *skb; |
| 1432 | struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME]; |
| 1433 | struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG]; |
| 1434 | u64 dest; |
| 1435 | HvLpVirtualLanIndex vlan; |
| 1436 | struct net_device *dev; |
| 1437 | struct veth_port *port; |
| 1438 | |
| 1439 | /* FIXME: do we need this? */ |
| 1440 | memset(local_list, 0, sizeof(local_list)); |
| 1441 | memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG)); |
| 1442 | |
| 1443 | /* a 0 address marks the end of the valid entries */ |
| 1444 | if (senddata->addr[startchunk] == 0) |
| 1445 | break; |
| 1446 | |
| 1447 | /* make sure that we have at least 1 EOF entry in the |
| 1448 | * remaining entries */ |
| 1449 | if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) { |
| 1450 | veth_error("Missing EOF fragment in event " |
| 1451 | "eofmask = 0x%x startchunk = %d\n", |
| 1452 | (unsigned)senddata->eofmask, |
| 1453 | startchunk); |
| 1454 | break; |
| 1455 | } |
| 1456 | |
| 1457 | /* build list of chunks in this frame */ |
| 1458 | nchunks = 0; |
| 1459 | do { |
| 1460 | remote_list[nchunks].addr = |
| 1461 | (u64) senddata->addr[startchunk+nchunks] << 32; |
| 1462 | remote_list[nchunks].size = |
| 1463 | senddata->len[startchunk+nchunks]; |
| 1464 | length += remote_list[nchunks].size; |
| 1465 | } while (! (senddata->eofmask & |
| 1466 | (1 << (VETH_EOF_SHIFT + startchunk + nchunks++)))); |
| 1467 | |
| 1468 | /* length == total length of all chunks */ |
| 1469 | /* nchunks == # of chunks in this frame */ |
| 1470 | |
| 1471 | if ((length - ETH_HLEN) > VETH_MAX_MTU) { |
| 1472 | veth_error("Received oversize frame from LPAR %d " |
| 1473 | "(length = %d)\n", |
| 1474 | cnx->remote_lp, length); |
| 1475 | continue; |
| 1476 | } |
| 1477 | |
| 1478 | skb = alloc_skb(length, GFP_ATOMIC); |
| 1479 | if (!skb) |
| 1480 | continue; |
| 1481 | |
| 1482 | veth_build_dma_list(local_list, skb->data, length); |
| 1483 | |
| 1484 | rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan, |
| 1485 | event->base_event.xSourceLp, |
| 1486 | HvLpDma_Direction_RemoteToLocal, |
| 1487 | cnx->src_inst, |
| 1488 | cnx->dst_inst, |
| 1489 | HvLpDma_AddressType_RealAddress, |
| 1490 | HvLpDma_AddressType_TceIndex, |
| 1491 | iseries_hv_addr(&local_list), |
| 1492 | iseries_hv_addr(&remote_list), |
| 1493 | length); |
| 1494 | if (rc != HvLpDma_Rc_Good) { |
| 1495 | dev_kfree_skb_irq(skb); |
| 1496 | continue; |
| 1497 | } |
| 1498 | |
| 1499 | vlan = skb->data[9]; |
| 1500 | dev = veth_dev[vlan]; |
| 1501 | if (! dev) { |
| 1502 | /* |
| 1503 | * Some earlier versions of the driver sent |
| 1504 | * broadcasts down all connections, even to lpars |
| 1505 | * that weren't on the relevant vlan. So ignore |
| 1506 | * packets belonging to a vlan we're not on. |
| 1507 | * We can also be here if we receive packets while |
| 1508 | * the driver is going down, because then dev is NULL. |
| 1509 | */ |
| 1510 | dev_kfree_skb_irq(skb); |
| 1511 | continue; |
| 1512 | } |
| 1513 | |
| 1514 | port = netdev_priv(dev); |
| 1515 | dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000; |
| 1516 | |
| 1517 | if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) { |
| 1518 | dev_kfree_skb_irq(skb); |
| 1519 | continue; |
| 1520 | } |
| 1521 | if (! veth_frame_wanted(port, dest)) { |
| 1522 | dev_kfree_skb_irq(skb); |
| 1523 | continue; |
| 1524 | } |
| 1525 | |
| 1526 | skb_put(skb, length); |
| 1527 | skb->protocol = eth_type_trans(skb, dev); |
| 1528 | skb->ip_summed = CHECKSUM_NONE; |
| 1529 | netif_rx(skb); /* send it up */ |
| 1530 | dev->stats.rx_packets++; |
| 1531 | dev->stats.rx_bytes += length; |
| 1532 | } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG); |
| 1533 | |
| 1534 | /* Ack it */ |
| 1535 | spin_lock_irqsave(&cnx->lock, flags); |
| 1536 | BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG); |
| 1537 | |
| 1538 | cnx->pending_acks[cnx->num_pending_acks++] = |
| 1539 | event->base_event.xCorrelationToken; |
| 1540 | |
| 1541 | if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold) |
| 1542 | || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) ) |
| 1543 | veth_flush_acks(cnx); |
| 1544 | |
| 1545 | spin_unlock_irqrestore(&cnx->lock, flags); |
| 1546 | } |
| 1547 | |
| 1548 | static void veth_timed_ack(unsigned long ptr) |
| 1549 | { |
| 1550 | struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr; |
| 1551 | unsigned long flags; |
| 1552 | |
| 1553 | /* Ack all the events */ |
| 1554 | spin_lock_irqsave(&cnx->lock, flags); |
| 1555 | if (cnx->num_pending_acks > 0) |
| 1556 | veth_flush_acks(cnx); |
| 1557 | |
| 1558 | /* Reschedule the timer */ |
| 1559 | cnx->ack_timer.expires = jiffies + cnx->ack_timeout; |
| 1560 | add_timer(&cnx->ack_timer); |
| 1561 | spin_unlock_irqrestore(&cnx->lock, flags); |
| 1562 | } |
| 1563 | |
| 1564 | static int veth_remove(struct vio_dev *vdev) |
| 1565 | { |
| 1566 | struct veth_lpar_connection *cnx; |
| 1567 | struct net_device *dev; |
| 1568 | struct veth_port *port; |
| 1569 | int i; |
| 1570 | |
| 1571 | dev = veth_dev[vdev->unit_address]; |
| 1572 | |
| 1573 | if (! dev) |
| 1574 | return 0; |
| 1575 | |
| 1576 | port = netdev_priv(dev); |
| 1577 | |
| 1578 | for (i = 0; i < HVMAXARCHITECTEDLPS; i++) { |
| 1579 | cnx = veth_cnx[i]; |
| 1580 | |
| 1581 | if (cnx && (port->lpar_map & (1 << i))) { |
| 1582 | /* Drop our reference to connections on our VLAN */ |
| 1583 | kobject_put(&cnx->kobject); |
| 1584 | } |
| 1585 | } |
| 1586 | |
| 1587 | veth_dev[vdev->unit_address] = NULL; |
| 1588 | kobject_del(&port->kobject); |
| 1589 | kobject_put(&port->kobject); |
| 1590 | unregister_netdev(dev); |
| 1591 | free_netdev(dev); |
| 1592 | |
| 1593 | return 0; |
| 1594 | } |
| 1595 | |
| 1596 | static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id) |
| 1597 | { |
| 1598 | int i = vdev->unit_address; |
| 1599 | struct net_device *dev; |
| 1600 | struct veth_port *port; |
| 1601 | |
| 1602 | dev = veth_probe_one(i, vdev); |
| 1603 | if (dev == NULL) { |
| 1604 | veth_remove(vdev); |
| 1605 | return 1; |
| 1606 | } |
| 1607 | veth_dev[i] = dev; |
| 1608 | |
| 1609 | port = (struct veth_port*)netdev_priv(dev); |
| 1610 | |
| 1611 | /* Start the state machine on each connection on this vlan. If we're |
| 1612 | * the first dev to do so this will commence link negotiation */ |
| 1613 | for (i = 0; i < HVMAXARCHITECTEDLPS; i++) { |
| 1614 | struct veth_lpar_connection *cnx; |
| 1615 | |
| 1616 | if (! (port->lpar_map & (1 << i))) |
| 1617 | continue; |
| 1618 | |
| 1619 | cnx = veth_cnx[i]; |
| 1620 | if (!cnx) |
| 1621 | continue; |
| 1622 | |
| 1623 | kobject_get(&cnx->kobject); |
| 1624 | veth_kick_statemachine(cnx); |
| 1625 | } |
| 1626 | |
| 1627 | return 0; |
| 1628 | } |
| 1629 | |
| 1630 | /** |
| 1631 | * veth_device_table: Used by vio.c to match devices that we |
| 1632 | * support. |
| 1633 | */ |
| 1634 | static struct vio_device_id veth_device_table[] __devinitdata = { |
| 1635 | { "network", "IBM,iSeries-l-lan" }, |
| 1636 | { "", "" } |
| 1637 | }; |
| 1638 | MODULE_DEVICE_TABLE(vio, veth_device_table); |
| 1639 | |
| 1640 | static struct vio_driver veth_driver = { |
| 1641 | .id_table = veth_device_table, |
| 1642 | .probe = veth_probe, |
| 1643 | .remove = veth_remove, |
| 1644 | .driver = { |
| 1645 | .name = DRV_NAME, |
| 1646 | .owner = THIS_MODULE, |
| 1647 | } |
| 1648 | }; |
| 1649 | |
| 1650 | /* |
| 1651 | * Module initialization/cleanup |
| 1652 | */ |
| 1653 | |
| 1654 | static void __exit veth_module_cleanup(void) |
| 1655 | { |
| 1656 | int i; |
| 1657 | struct veth_lpar_connection *cnx; |
| 1658 | |
| 1659 | /* Disconnect our "irq" to stop events coming from the Hypervisor. */ |
| 1660 | HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan); |
| 1661 | |
| 1662 | /* Make sure any work queued from Hypervisor callbacks is finished. */ |
| 1663 | flush_scheduled_work(); |
| 1664 | |
| 1665 | for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) { |
| 1666 | cnx = veth_cnx[i]; |
| 1667 | |
| 1668 | if (!cnx) |
| 1669 | continue; |
| 1670 | |
| 1671 | /* Remove the connection from sysfs */ |
| 1672 | kobject_del(&cnx->kobject); |
| 1673 | /* Drop the driver's reference to the connection */ |
| 1674 | kobject_put(&cnx->kobject); |
| 1675 | } |
| 1676 | |
| 1677 | /* Unregister the driver, which will close all the netdevs and stop |
| 1678 | * the connections when they're no longer referenced. */ |
| 1679 | vio_unregister_driver(&veth_driver); |
| 1680 | } |
| 1681 | module_exit(veth_module_cleanup); |
| 1682 | |
| 1683 | static int __init veth_module_init(void) |
| 1684 | { |
| 1685 | int i; |
| 1686 | int rc; |
| 1687 | |
| 1688 | if (!firmware_has_feature(FW_FEATURE_ISERIES)) |
| 1689 | return -ENODEV; |
| 1690 | |
| 1691 | this_lp = HvLpConfig_getLpIndex_outline(); |
| 1692 | |
| 1693 | for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) { |
| 1694 | rc = veth_init_connection(i); |
| 1695 | if (rc != 0) |
| 1696 | goto error; |
| 1697 | } |
| 1698 | |
| 1699 | HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan, |
| 1700 | &veth_handle_event); |
| 1701 | |
| 1702 | rc = vio_register_driver(&veth_driver); |
| 1703 | if (rc != 0) |
| 1704 | goto error; |
| 1705 | |
| 1706 | for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) { |
| 1707 | struct kobject *kobj; |
| 1708 | |
| 1709 | if (!veth_cnx[i]) |
| 1710 | continue; |
| 1711 | |
| 1712 | kobj = &veth_cnx[i]->kobject; |
| 1713 | /* If the add failes, complain but otherwise continue */ |
| 1714 | if (0 != driver_add_kobj(&veth_driver.driver, kobj, |
| 1715 | "cnx%.2d", veth_cnx[i]->remote_lp)) |
| 1716 | veth_error("cnx %d: Failed adding to sysfs.\n", i); |
| 1717 | } |
| 1718 | |
| 1719 | return 0; |
| 1720 | |
| 1721 | error: |
| 1722 | for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) { |
| 1723 | veth_destroy_connection(veth_cnx[i]); |
| 1724 | } |
| 1725 | |
| 1726 | return rc; |
| 1727 | } |
| 1728 | module_init(veth_module_init); |