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   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
  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 work_struct 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         struct net_device_stats stats;
 200         u64 mac_addr;
 201         HvLpIndexMap lpar_map;
 202
 203         /* queue_lock protects the stopped_map and dev's queue. */
 204         spinlock_t queue_lock;
 205         HvLpIndexMap stopped_map;
 206
 207         /* mcast_gate protects promiscuous, num_mcast & mcast_addr. */
 208         rwlock_t mcast_gate;
 209         int promiscuous;
 210         int num_mcast;
 211         u64 mcast_addr[VETH_MAX_MCAST];
 212
 213         struct kobject kobject;
 214 };
 215
 216 static HvLpIndex this_lp;
 217 static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */
 218 static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */
 219
 220 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev);
 221 static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *);
 222 static void veth_wake_queues(struct veth_lpar_connection *cnx);
 223 static void veth_stop_queues(struct veth_lpar_connection *cnx);
 224 static void veth_receive(struct veth_lpar_connection *, struct veth_lpevent *);
 225 static void veth_release_connection(struct kobject *kobject);
 226 static void veth_timed_ack(unsigned long ptr);
 227 static void veth_timed_reset(unsigned long ptr);
 228
 229 /*
 230  * Utility functions
 231  */
 232
 233 #define veth_info(fmt, args...) \
 234         printk(KERN_INFO DRV_NAME ": " fmt, ## args)
 235
 236 #define veth_error(fmt, args...) \
 237         printk(KERN_ERR DRV_NAME ": Error: " fmt, ## args)
 238
 239 #ifdef DEBUG
 240 #define veth_debug(fmt, args...) \
 241         printk(KERN_DEBUG DRV_NAME ": " fmt, ## args)
 242 #else
 243 #define veth_debug(fmt, args...) do {} while (0)
 244 #endif
 245
 246 /* You must hold the connection's lock when you call this function. */
 247 static inline void veth_stack_push(struct veth_lpar_connection *cnx,
 248                                    struct veth_msg *msg)
 249 {
 250         msg->next = cnx->msg_stack_head;
 251         cnx->msg_stack_head = msg;
 252 }
 253
 254 /* You must hold the connection's lock when you call this function. */
 255 static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx)
 256 {
 257         struct veth_msg *msg;
 258
 259         msg = cnx->msg_stack_head;
 260         if (msg)
 261                 cnx->msg_stack_head = cnx->msg_stack_head->next;
 262
 263         return msg;
 264 }
 265
 266 /* You must hold the connection's lock when you call this function. */
 267 static inline int veth_stack_is_empty(struct veth_lpar_connection *cnx)
 268 {
 269         return cnx->msg_stack_head == NULL;
 270 }
 271
 272 static inline HvLpEvent_Rc
 273 veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype,
 274                  HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype,
 275                  u64 token,
 276                  u64 data1, u64 data2, u64 data3, u64 data4, u64 data5)
 277 {
 278         return HvCallEvent_signalLpEventFast(cnx->remote_lp,
 279                                              HvLpEvent_Type_VirtualLan,
 280                                              subtype, ackind, acktype,
 281                                              cnx->src_inst,
 282                                              cnx->dst_inst,
 283                                              token, data1, data2, data3,
 284                                              data4, data5);
 285 }
 286
 287 static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx,
 288                                            u16 subtype, u64 token, void *data)
 289 {
 290         u64 *p = (u64 *) data;
 291
 292         return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck,
 293                                 HvLpEvent_AckType_ImmediateAck,
 294                                 token, p[0], p[1], p[2], p[3], p[4]);
 295 }
 296
 297 struct veth_allocation {
 298         struct completion c;
 299         int num;
 300 };
 301
 302 static void veth_complete_allocation(void *parm, int number)
 303 {
 304         struct veth_allocation *vc = (struct veth_allocation *)parm;
 305
 306         vc->num = number;
 307         complete(&vc->c);
 308 }
 309
 310 static int veth_allocate_events(HvLpIndex rlp, int number)
 311 {
 312         struct veth_allocation vc = { COMPLETION_INITIALIZER(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%lX\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_work(&cnx->statemachine_wq);
 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(void *p)
 642 {
 643         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)p;
 644         int rlp = cnx->remote_lp;
 645         int rc;
 646
 647         spin_lock_irq(&cnx->lock);
 648
 649  restart:
 650         if (cnx->state & VETH_STATE_RESET) {
 651                 if (cnx->state & VETH_STATE_OPEN)
 652                         HvCallEvent_closeLpEventPath(cnx->remote_lp,
 653                                                      HvLpEvent_Type_VirtualLan);
 654
 655                 /*
 656                  * Reset ack data. This prevents the ack_timer actually
 657                  * doing anything, even if it runs one more time when
 658                  * we drop the lock below.
 659                  */
 660                 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
 661                 cnx->num_pending_acks = 0;
 662
 663                 cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
 664                                 | VETH_STATE_OPEN | VETH_STATE_SENTCAPS
 665                                 | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
 666                                 | VETH_STATE_SENTCAPACK | VETH_STATE_READY);
 667
 668                 /* Clean up any leftover messages */
 669                 if (cnx->msgs) {
 670                         int i;
 671                         for (i = 0; i < VETH_NUMBUFFERS; ++i)
 672                                 veth_recycle_msg(cnx, cnx->msgs + i);
 673                 }
 674
 675                 cnx->outstanding_tx = 0;
 676                 veth_wake_queues(cnx);
 677
 678                 /* Drop the lock so we can do stuff that might sleep or
 679                  * take other locks. */
 680                 spin_unlock_irq(&cnx->lock);
 681
 682                 del_timer_sync(&cnx->ack_timer);
 683                 del_timer_sync(&cnx->reset_timer);
 684
 685                 spin_lock_irq(&cnx->lock);
 686
 687                 if (cnx->state & VETH_STATE_RESET)
 688                         goto restart;
 689
 690                 /* Hack, wait for the other end to reset itself. */
 691                 if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
 692                         schedule_delayed_work(&cnx->statemachine_wq, 5 * HZ);
 693                         goto out;
 694                 }
 695         }
 696
 697         if (cnx->state & VETH_STATE_SHUTDOWN)
 698                 /* It's all over, do nothing */
 699                 goto out;
 700
 701         if ( !(cnx->state & VETH_STATE_OPEN) ) {
 702                 if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
 703                         goto cant_cope;
 704
 705                 HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
 706                 cnx->src_inst =
 707                         HvCallEvent_getSourceLpInstanceId(rlp,
 708                                                           HvLpEvent_Type_VirtualLan);
 709                 cnx->dst_inst =
 710                         HvCallEvent_getTargetLpInstanceId(rlp,
 711                                                           HvLpEvent_Type_VirtualLan);
 712                 cnx->state |= VETH_STATE_OPEN;
 713         }
 714
 715         if ( (cnx->state & VETH_STATE_OPEN)
 716              && !(cnx->state & VETH_STATE_SENTMON) ) {
 717                 rc = veth_signalevent(cnx, VETH_EVENT_MONITOR,
 718                                       HvLpEvent_AckInd_DoAck,
 719                                       HvLpEvent_AckType_DeferredAck,
 720                                       0, 0, 0, 0, 0, 0);
 721
 722                 if (rc == HvLpEvent_Rc_Good) {
 723                         cnx->state |= VETH_STATE_SENTMON;
 724                 } else {
 725                         if ( (rc != HvLpEvent_Rc_PartitionDead)
 726                              && (rc != HvLpEvent_Rc_PathClosed) )
 727                                 veth_error("Error sending monitor to LPAR %d, "
 728                                                 "rc = %d\n", rlp, rc);
 729
 730                         /* Oh well, hope we get a cap from the other
 731                          * end and do better when that kicks us */
 732                         goto out;
 733                 }
 734         }
 735
 736         if ( (cnx->state & VETH_STATE_OPEN)
 737              && !(cnx->state & VETH_STATE_SENTCAPS)) {
 738                 u64 *rawcap = (u64 *)&cnx->local_caps;
 739
 740                 rc = veth_signalevent(cnx, VETH_EVENT_CAP,
 741                                       HvLpEvent_AckInd_DoAck,
 742                                       HvLpEvent_AckType_ImmediateAck,
 743                                       0, rawcap[0], rawcap[1], rawcap[2],
 744                                       rawcap[3], rawcap[4]);
 745
 746                 if (rc == HvLpEvent_Rc_Good) {
 747                         cnx->state |= VETH_STATE_SENTCAPS;
 748                 } else {
 749                         if ( (rc != HvLpEvent_Rc_PartitionDead)
 750                              && (rc != HvLpEvent_Rc_PathClosed) )
 751                                 veth_error("Error sending caps to LPAR %d, "
 752                                                 "rc = %d\n", rlp, rc);
 753
 754                         /* Oh well, hope we get a cap from the other
 755                          * end and do better when that kicks us */
 756                         goto out;
 757                 }
 758         }
 759
 760         if ((cnx->state & VETH_STATE_GOTCAPS)
 761             && !(cnx->state & VETH_STATE_SENTCAPACK)) {
 762                 struct veth_cap_data *remote_caps = &cnx->remote_caps;
 763
 764                 memcpy(remote_caps, &cnx->cap_event.u.caps_data,
 765                        sizeof(*remote_caps));
 766
 767                 spin_unlock_irq(&cnx->lock);
 768                 rc = veth_process_caps(cnx);
 769                 spin_lock_irq(&cnx->lock);
 770
 771                 /* We dropped the lock, so recheck for anything which
 772                  * might mess us up */
 773                 if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
 774                         goto restart;
 775
 776                 cnx->cap_event.base_event.xRc = rc;
 777                 HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
 778                 if (rc == HvLpEvent_Rc_Good)
 779                         cnx->state |= VETH_STATE_SENTCAPACK;
 780                 else
 781                         goto cant_cope;
 782         }
 783
 784         if ((cnx->state & VETH_STATE_GOTCAPACK)
 785             && (cnx->state & VETH_STATE_GOTCAPS)
 786             && !(cnx->state & VETH_STATE_READY)) {
 787                 if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
 788                         /* Start the ACK timer */
 789                         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
 790                         add_timer(&cnx->ack_timer);
 791                         cnx->state |= VETH_STATE_READY;
 792                 } else {
 793                         veth_error("Caps rejected by LPAR %d, rc = %d\n",
 794                                         rlp, cnx->cap_ack_event.base_event.xRc);
 795                         goto cant_cope;
 796                 }
 797         }
 798
 799  out:
 800         spin_unlock_irq(&cnx->lock);
 801         return;
 802
 803  cant_cope:
 804         /* FIXME: we get here if something happens we really can't
 805          * cope with.  The link will never work once we get here, and
 806          * all we can do is not lock the rest of the system up */
 807         veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
 808                         " (state = 0x%04lx)\n", rlp, cnx->state);
 809         cnx->state |= VETH_STATE_SHUTDOWN;
 810         spin_unlock_irq(&cnx->lock);
 811 }
 812
 813 static int veth_init_connection(u8 rlp)
 814 {
 815         struct veth_lpar_connection *cnx;
 816         struct veth_msg *msgs;
 817         int i, rc;
 818
 819         if ( (rlp == this_lp)
 820              || ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
 821                 return 0;
 822
 823         cnx = kmalloc(sizeof(*cnx), GFP_KERNEL);
 824         if (! cnx)
 825                 return -ENOMEM;
 826         memset(cnx, 0, sizeof(*cnx));
 827
 828         cnx->remote_lp = rlp;
 829         spin_lock_init(&cnx->lock);
 830         INIT_WORK(&cnx->statemachine_wq, veth_statemachine, cnx);
 831
 832         init_timer(&cnx->ack_timer);
 833         cnx->ack_timer.function = veth_timed_ack;
 834         cnx->ack_timer.data = (unsigned long) cnx;
 835
 836         init_timer(&cnx->reset_timer);
 837         cnx->reset_timer.function = veth_timed_reset;
 838         cnx->reset_timer.data = (unsigned long) cnx;
 839         cnx->reset_timeout = 5 * HZ * (VETH_ACKTIMEOUT / 1000000);
 840
 841         memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
 842
 843         veth_cnx[rlp] = cnx;
 844
 845         /* This gets us 1 reference, which is held on behalf of the driver
 846          * infrastructure. It's released at module unload. */
 847         kobject_init(&cnx->kobject);
 848         cnx->kobject.ktype = &veth_lpar_connection_ktype;
 849         rc = kobject_set_name(&cnx->kobject, "cnx%.2d", rlp);
 850         if (rc != 0)
 851                 return rc;
 852
 853         msgs = kmalloc(VETH_NUMBUFFERS * sizeof(struct veth_msg), GFP_KERNEL);
 854         if (! msgs) {
 855                 veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
 856                 return -ENOMEM;
 857         }
 858
 859         cnx->msgs = msgs;
 860         memset(msgs, 0, VETH_NUMBUFFERS * sizeof(struct veth_msg));
 861
 862         for (i = 0; i < VETH_NUMBUFFERS; i++) {
 863                 msgs[i].token = i;
 864                 veth_stack_push(cnx, msgs + i);
 865         }
 866
 867         cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
 868
 869         if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
 870                 veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
 871                 return -ENOMEM;
 872         }
 873
 874         cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
 875         cnx->local_caps.ack_threshold = ACK_THRESHOLD;
 876         cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
 877
 878         return 0;
 879 }
 880
 881 static void veth_stop_connection(struct veth_lpar_connection *cnx)
 882 {
 883         if (!cnx)
 884                 return;
 885
 886         spin_lock_irq(&cnx->lock);
 887         cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
 888         veth_kick_statemachine(cnx);
 889         spin_unlock_irq(&cnx->lock);
 890
 891         /* There's a slim chance the reset code has just queued the
 892          * statemachine to run in five seconds. If so we need to cancel
 893          * that and requeue the work to run now. */
 894         if (cancel_delayed_work(&cnx->statemachine_wq)) {
 895                 spin_lock_irq(&cnx->lock);
 896                 veth_kick_statemachine(cnx);
 897                 spin_unlock_irq(&cnx->lock);
 898         }
 899
 900         /* Wait for the state machine to run. */
 901         flush_scheduled_work();
 902 }
 903
 904 static void veth_destroy_connection(struct veth_lpar_connection *cnx)
 905 {
 906         if (!cnx)
 907                 return;
 908
 909         if (cnx->num_events > 0)
 910                 mf_deallocate_lp_events(cnx->remote_lp,
 911                                       HvLpEvent_Type_VirtualLan,
 912                                       cnx->num_events,
 913                                       NULL, NULL);
 914         if (cnx->num_ack_events > 0)
 915                 mf_deallocate_lp_events(cnx->remote_lp,
 916                                       HvLpEvent_Type_VirtualLan,
 917                                       cnx->num_ack_events,
 918                                       NULL, NULL);
 919
 920         kfree(cnx->msgs);
 921         veth_cnx[cnx->remote_lp] = NULL;
 922         kfree(cnx);
 923 }
 924
 925 static void veth_release_connection(struct kobject *kobj)
 926 {
 927         struct veth_lpar_connection *cnx;
 928         cnx = container_of(kobj, struct veth_lpar_connection, kobject);
 929         veth_stop_connection(cnx);
 930         veth_destroy_connection(cnx);
 931 }
 932
 933 /*
 934  * net_device code
 935  */
 936
 937 static int veth_open(struct net_device *dev)
 938 {
 939         struct veth_port *port = (struct veth_port *) dev->priv;
 940
 941         memset(&port->stats, 0, sizeof (port->stats));
 942         netif_start_queue(dev);
 943         return 0;
 944 }
 945
 946 static int veth_close(struct net_device *dev)
 947 {
 948         netif_stop_queue(dev);
 949         return 0;
 950 }
 951
 952 static struct net_device_stats *veth_get_stats(struct net_device *dev)
 953 {
 954         struct veth_port *port = (struct veth_port *) dev->priv;
 955
 956         return &port->stats;
 957 }
 958
 959 static int veth_change_mtu(struct net_device *dev, int new_mtu)
 960 {
 961         if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
 962                 return -EINVAL;
 963         dev->mtu = new_mtu;
 964         return 0;
 965 }
 966
 967 static void veth_set_multicast_list(struct net_device *dev)
 968 {
 969         struct veth_port *port = (struct veth_port *) dev->priv;
 970         unsigned long flags;
 971
 972         write_lock_irqsave(&port->mcast_gate, flags);
 973
 974         if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
 975                         (dev->mc_count > VETH_MAX_MCAST)) {
 976                 port->promiscuous = 1;
 977         } else {
 978                 struct dev_mc_list *dmi = dev->mc_list;
 979                 int i;
 980
 981                 port->promiscuous = 0;
 982
 983                 /* Update table */
 984                 port->num_mcast = 0;
 985
 986                 for (i = 0; i < dev->mc_count; i++) {
 987                         u8 *addr = dmi->dmi_addr;
 988                         u64 xaddr = 0;
 989
 990                         if (addr[0] & 0x01) {/* multicast address? */
 991                                 memcpy(&xaddr, addr, ETH_ALEN);
 992                                 port->mcast_addr[port->num_mcast] = xaddr;
 993                                 port->num_mcast++;
 994                         }
 995                         dmi = dmi->next;
 996                 }
 997         }
 998
 999         write_unlock_irqrestore(&port->mcast_gate, flags);
1000 }
1001
1002 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1003 {
1004         strncpy(info->driver, DRV_NAME, sizeof(info->driver) - 1);
1005         info->driver[sizeof(info->driver) - 1] = '\0';
1006         strncpy(info->version, DRV_VERSION, sizeof(info->version) - 1);
1007         info->version[sizeof(info->version) - 1] = '\0';
1008 }
1009
1010 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
1011 {
1012         ecmd->supported = (SUPPORTED_1000baseT_Full
1013                           | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
1014         ecmd->advertising = (SUPPORTED_1000baseT_Full
1015                             | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
1016         ecmd->port = PORT_FIBRE;
1017         ecmd->transceiver = XCVR_INTERNAL;
1018         ecmd->phy_address = 0;
1019         ecmd->speed = SPEED_1000;
1020         ecmd->duplex = DUPLEX_FULL;
1021         ecmd->autoneg = AUTONEG_ENABLE;
1022         ecmd->maxtxpkt = 120;
1023         ecmd->maxrxpkt = 120;
1024         return 0;
1025 }
1026
1027 static u32 veth_get_link(struct net_device *dev)
1028 {
1029         return 1;
1030 }
1031
1032 static const struct ethtool_ops ops = {
1033         .get_drvinfo = veth_get_drvinfo,
1034         .get_settings = veth_get_settings,
1035         .get_link = veth_get_link,
1036 };
1037
1038 static struct net_device * __init veth_probe_one(int vlan,
1039                 struct vio_dev *vio_dev)
1040 {
1041         struct net_device *dev;
1042         struct veth_port *port;
1043         struct device *vdev = &vio_dev->dev;
1044         int i, rc;
1045         const unsigned char *mac_addr;
1046
1047         mac_addr = vio_get_attribute(vio_dev, "local-mac-address", NULL);
1048         if (mac_addr == NULL)
1049                 mac_addr = vio_get_attribute(vio_dev, "mac-address", NULL);
1050         if (mac_addr == NULL) {
1051                 veth_error("Unable to fetch MAC address from device tree.\n");
1052                 return NULL;
1053         }
1054
1055         dev = alloc_etherdev(sizeof (struct veth_port));
1056         if (! dev) {
1057                 veth_error("Unable to allocate net_device structure!\n");
1058                 return NULL;
1059         }
1060
1061         port = (struct veth_port *) dev->priv;
1062
1063         spin_lock_init(&port->queue_lock);
1064         rwlock_init(&port->mcast_gate);
1065         port->stopped_map = 0;
1066
1067         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1068                 HvLpVirtualLanIndexMap map;
1069
1070                 if (i == this_lp)
1071                         continue;
1072                 map = HvLpConfig_getVirtualLanIndexMapForLp(i);
1073                 if (map & (0x8000 >> vlan))
1074                         port->lpar_map |= (1 << i);
1075         }
1076         port->dev = vdev;
1077
1078         memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
1079
1080         dev->mtu = VETH_MAX_MTU;
1081
1082         memcpy(&port->mac_addr, mac_addr, ETH_ALEN);
1083
1084         dev->open = veth_open;
1085         dev->hard_start_xmit = veth_start_xmit;
1086         dev->stop = veth_close;
1087         dev->get_stats = veth_get_stats;
1088         dev->change_mtu = veth_change_mtu;
1089         dev->set_mac_address = NULL;
1090         dev->set_multicast_list = veth_set_multicast_list;
1091         SET_ETHTOOL_OPS(dev, &ops);
1092
1093         SET_NETDEV_DEV(dev, vdev);
1094
1095         rc = register_netdev(dev);
1096         if (rc != 0) {
1097                 veth_error("Failed registering net device for vlan%d.\n", vlan);
1098                 free_netdev(dev);
1099                 return NULL;
1100         }
1101
1102         kobject_init(&port->kobject);
1103         port->kobject.parent = &dev->class_dev.kobj;
1104         port->kobject.ktype  = &veth_port_ktype;
1105         kobject_set_name(&port->kobject, "veth_port");
1106         if (0 != kobject_add(&port->kobject))
1107                 veth_error("Failed adding port for %s to sysfs.\n", dev->name);
1108
1109         veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
1110                         dev->name, vlan, port->lpar_map);
1111
1112         return dev;
1113 }
1114
1115 /*
1116  * Tx path
1117  */
1118
1119 static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
1120                                 struct net_device *dev)
1121 {
1122         struct veth_lpar_connection *cnx = veth_cnx[rlp];
1123         struct veth_port *port = (struct veth_port *) dev->priv;
1124         HvLpEvent_Rc rc;
1125         struct veth_msg *msg = NULL;
1126         unsigned long flags;
1127
1128         if (! cnx)
1129                 return 0;
1130
1131         spin_lock_irqsave(&cnx->lock, flags);
1132
1133         if (! (cnx->state & VETH_STATE_READY))
1134                 goto no_error;
1135
1136         if ((skb->len - ETH_HLEN) > VETH_MAX_MTU)
1137                 goto drop;
1138
1139         msg = veth_stack_pop(cnx);
1140         if (! msg)
1141                 goto drop;
1142
1143         msg->in_use = 1;
1144         msg->skb = skb_get(skb);
1145
1146         msg->data.addr[0] = dma_map_single(port->dev, skb->data,
1147                                 skb->len, DMA_TO_DEVICE);
1148
1149         if (dma_mapping_error(msg->data.addr[0]))
1150                 goto recycle_and_drop;
1151
1152         msg->dev = port->dev;
1153         msg->data.len[0] = skb->len;
1154         msg->data.eofmask = 1 << VETH_EOF_SHIFT;
1155
1156         rc = veth_signaldata(cnx, VETH_EVENT_FRAMES, msg->token, &msg->data);
1157
1158         if (rc != HvLpEvent_Rc_Good)
1159                 goto recycle_and_drop;
1160
1161         /* If the timer's not already running, start it now. */
1162         if (0 == cnx->outstanding_tx)
1163                 mod_timer(&cnx->reset_timer, jiffies + cnx->reset_timeout);
1164
1165         cnx->last_contact = jiffies;
1166         cnx->outstanding_tx++;
1167
1168         if (veth_stack_is_empty(cnx))
1169                 veth_stop_queues(cnx);
1170
1171  no_error:
1172         spin_unlock_irqrestore(&cnx->lock, flags);
1173         return 0;
1174
1175  recycle_and_drop:
1176         veth_recycle_msg(cnx, msg);
1177  drop:
1178         spin_unlock_irqrestore(&cnx->lock, flags);
1179         return 1;
1180 }
1181
1182 static void veth_transmit_to_many(struct sk_buff *skb,
1183                                           HvLpIndexMap lpmask,
1184                                           struct net_device *dev)
1185 {
1186         struct veth_port *port = (struct veth_port *) dev->priv;
1187         int i, success, error;
1188
1189         success = error = 0;
1190
1191         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1192                 if ((lpmask & (1 << i)) == 0)
1193                         continue;
1194
1195                 if (veth_transmit_to_one(skb, i, dev))
1196                         error = 1;
1197                 else
1198                         success = 1;
1199         }
1200
1201         if (error)
1202                 port->stats.tx_errors++;
1203
1204         if (success) {
1205                 port->stats.tx_packets++;
1206                 port->stats.tx_bytes += skb->len;
1207         }
1208 }
1209
1210 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1211 {
1212         unsigned char *frame = skb->data;
1213         struct veth_port *port = (struct veth_port *) dev->priv;
1214         HvLpIndexMap lpmask;
1215
1216         if (! (frame[0] & 0x01)) {
1217                 /* unicast packet */
1218                 HvLpIndex rlp = frame[5];
1219
1220                 if ( ! ((1 << rlp) & port->lpar_map) ) {
1221                         dev_kfree_skb(skb);
1222                         return 0;
1223                 }
1224
1225                 lpmask = 1 << rlp;
1226         } else {
1227                 lpmask = port->lpar_map;
1228         }
1229
1230         veth_transmit_to_many(skb, lpmask, dev);
1231
1232         dev_kfree_skb(skb);
1233
1234         return 0;
1235 }
1236
1237 /* You must hold the connection's lock when you call this function. */
1238 static void veth_recycle_msg(struct veth_lpar_connection *cnx,
1239                              struct veth_msg *msg)
1240 {
1241         u32 dma_address, dma_length;
1242
1243         if (msg->in_use) {
1244                 msg->in_use = 0;
1245                 dma_address = msg->data.addr[0];
1246                 dma_length = msg->data.len[0];
1247
1248                 if (!dma_mapping_error(dma_address))
1249                         dma_unmap_single(msg->dev, dma_address, dma_length,
1250                                         DMA_TO_DEVICE);
1251
1252                 if (msg->skb) {
1253                         dev_kfree_skb_any(msg->skb);
1254                         msg->skb = NULL;
1255                 }
1256
1257                 memset(&msg->data, 0, sizeof(msg->data));
1258                 veth_stack_push(cnx, msg);
1259         } else if (cnx->state & VETH_STATE_OPEN) {
1260                 veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
1261                                 cnx->remote_lp, msg->token);
1262         }
1263 }
1264
1265 static void veth_wake_queues(struct veth_lpar_connection *cnx)
1266 {
1267         int i;
1268
1269         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1270                 struct net_device *dev = veth_dev[i];
1271                 struct veth_port *port;
1272                 unsigned long flags;
1273
1274                 if (! dev)
1275                         continue;
1276
1277                 port = (struct veth_port *)dev->priv;
1278
1279                 if (! (port->lpar_map & (1<<cnx->remote_lp)))
1280                         continue;
1281
1282                 spin_lock_irqsave(&port->queue_lock, flags);
1283
1284                 port->stopped_map &= ~(1 << cnx->remote_lp);
1285
1286                 if (0 == port->stopped_map && netif_queue_stopped(dev)) {
1287                         veth_debug("cnx %d: woke queue for %s.\n",
1288                                         cnx->remote_lp, dev->name);
1289                         netif_wake_queue(dev);
1290                 }
1291                 spin_unlock_irqrestore(&port->queue_lock, flags);
1292         }
1293 }
1294
1295 static void veth_stop_queues(struct veth_lpar_connection *cnx)
1296 {
1297         int i;
1298
1299         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1300                 struct net_device *dev = veth_dev[i];
1301                 struct veth_port *port;
1302
1303                 if (! dev)
1304                         continue;
1305
1306                 port = (struct veth_port *)dev->priv;
1307
1308                 /* If this cnx is not on the vlan for this port, continue */
1309                 if (! (port->lpar_map & (1 << cnx->remote_lp)))
1310                         continue;
1311
1312                 spin_lock(&port->queue_lock);
1313
1314                 netif_stop_queue(dev);
1315                 port->stopped_map |= (1 << cnx->remote_lp);
1316
1317                 veth_debug("cnx %d: stopped queue for %s, map = 0x%x.\n",
1318                                 cnx->remote_lp, dev->name, port->stopped_map);
1319
1320                 spin_unlock(&port->queue_lock);
1321         }
1322 }
1323
1324 static void veth_timed_reset(unsigned long ptr)
1325 {
1326         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)ptr;
1327         unsigned long trigger_time, flags;
1328
1329         /* FIXME is it possible this fires after veth_stop_connection()?
1330          * That would reschedule the statemachine for 5 seconds and probably
1331          * execute it after the module's been unloaded. Hmm. */
1332
1333         spin_lock_irqsave(&cnx->lock, flags);
1334
1335         if (cnx->outstanding_tx > 0) {
1336                 trigger_time = cnx->last_contact + cnx->reset_timeout;
1337
1338                 if (trigger_time < jiffies) {
1339                         cnx->state |= VETH_STATE_RESET;
1340                         veth_kick_statemachine(cnx);
1341                         veth_error("%d packets not acked by LPAR %d within %d "
1342                                         "seconds, resetting.\n",
1343                                         cnx->outstanding_tx, cnx->remote_lp,
1344                                         cnx->reset_timeout / HZ);
1345                 } else {
1346                         /* Reschedule the timer */
1347                         trigger_time = jiffies + cnx->reset_timeout;
1348                         mod_timer(&cnx->reset_timer, trigger_time);
1349                 }
1350         }
1351
1352         spin_unlock_irqrestore(&cnx->lock, flags);
1353 }
1354
1355 /*
1356  * Rx path
1357  */
1358
1359 static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
1360 {
1361         int wanted = 0;
1362         int i;
1363         unsigned long flags;
1364
1365         if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
1366                 return 1;
1367
1368         read_lock_irqsave(&port->mcast_gate, flags);
1369
1370         if (port->promiscuous) {
1371                 wanted = 1;
1372                 goto out;
1373         }
1374
1375         for (i = 0; i < port->num_mcast; ++i) {
1376                 if (port->mcast_addr[i] == mac_addr) {
1377                         wanted = 1;
1378                         break;
1379                 }
1380         }
1381
1382  out:
1383         read_unlock_irqrestore(&port->mcast_gate, flags);
1384
1385         return wanted;
1386 }
1387
1388 struct dma_chunk {
1389         u64 addr;
1390         u64 size;
1391 };
1392
1393 #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
1394
1395 static inline void veth_build_dma_list(struct dma_chunk *list,
1396                                        unsigned char *p, unsigned long length)
1397 {
1398         unsigned long done;
1399         int i = 1;
1400
1401         /* FIXME: skbs are continguous in real addresses.  Do we
1402          * really need to break it into PAGE_SIZE chunks, or can we do
1403          * it just at the granularity of iSeries real->absolute
1404          * mapping?  Indeed, given the way the allocator works, can we
1405          * count on them being absolutely contiguous? */
1406         list[0].addr = iseries_hv_addr(p);
1407         list[0].size = min(length,
1408                            PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
1409
1410         done = list[0].size;
1411         while (done < length) {
1412                 list[i].addr = iseries_hv_addr(p + done);
1413                 list[i].size = min(length-done, PAGE_SIZE);
1414                 done += list[i].size;
1415                 i++;
1416         }
1417 }
1418
1419 static void veth_flush_acks(struct veth_lpar_connection *cnx)
1420 {
1421         HvLpEvent_Rc rc;
1422
1423         rc = veth_signaldata(cnx, VETH_EVENT_FRAMES_ACK,
1424                              0, &cnx->pending_acks);
1425
1426         if (rc != HvLpEvent_Rc_Good)
1427                 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1428                                 cnx->remote_lp, (int)rc);
1429
1430         cnx->num_pending_acks = 0;
1431         memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1432 }
1433
1434 static void veth_receive(struct veth_lpar_connection *cnx,
1435                          struct veth_lpevent *event)
1436 {
1437         struct veth_frames_data *senddata = &event->u.frames_data;
1438         int startchunk = 0;
1439         int nchunks;
1440         unsigned long flags;
1441         HvLpDma_Rc rc;
1442
1443         do {
1444                 u16 length = 0;
1445                 struct sk_buff *skb;
1446                 struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
1447                 struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
1448                 u64 dest;
1449                 HvLpVirtualLanIndex vlan;
1450                 struct net_device *dev;
1451                 struct veth_port *port;
1452
1453                 /* FIXME: do we need this? */
1454                 memset(local_list, 0, sizeof(local_list));
1455                 memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
1456
1457                 /* a 0 address marks the end of the valid entries */
1458                 if (senddata->addr[startchunk] == 0)
1459                         break;
1460
1461                 /* make sure that we have at least 1 EOF entry in the
1462                  * remaining entries */
1463                 if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
1464                         veth_error("Missing EOF fragment in event "
1465                                         "eofmask = 0x%x startchunk = %d\n",
1466                                         (unsigned)senddata->eofmask,
1467                                         startchunk);
1468                         break;
1469                 }
1470
1471                 /* build list of chunks in this frame */
1472                 nchunks = 0;
1473                 do {
1474                         remote_list[nchunks].addr =
1475                                 (u64) senddata->addr[startchunk+nchunks] << 32;
1476                         remote_list[nchunks].size =
1477                                 senddata->len[startchunk+nchunks];
1478                         length += remote_list[nchunks].size;
1479                 } while (! (senddata->eofmask &
1480                             (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
1481
1482                 /* length == total length of all chunks */
1483                 /* nchunks == # of chunks in this frame */
1484
1485                 if ((length - ETH_HLEN) > VETH_MAX_MTU) {
1486                         veth_error("Received oversize frame from LPAR %d "
1487                                         "(length = %d)\n",
1488                                         cnx->remote_lp, length);
1489                         continue;
1490                 }
1491
1492                 skb = alloc_skb(length, GFP_ATOMIC);
1493                 if (!skb)
1494                         continue;
1495
1496                 veth_build_dma_list(local_list, skb->data, length);
1497
1498                 rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
1499                                             event->base_event.xSourceLp,
1500                                             HvLpDma_Direction_RemoteToLocal,
1501                                             cnx->src_inst,
1502                                             cnx->dst_inst,
1503                                             HvLpDma_AddressType_RealAddress,
1504                                             HvLpDma_AddressType_TceIndex,
1505                                             iseries_hv_addr(&local_list),
1506                                             iseries_hv_addr(&remote_list),
1507                                             length);
1508                 if (rc != HvLpDma_Rc_Good) {
1509                         dev_kfree_skb_irq(skb);
1510                         continue;
1511                 }
1512
1513                 vlan = skb->data[9];
1514                 dev = veth_dev[vlan];
1515                 if (! dev) {
1516                         /*
1517                          * Some earlier versions of the driver sent
1518                          * broadcasts down all connections, even to lpars
1519                          * that weren't on the relevant vlan. So ignore
1520                          * packets belonging to a vlan we're not on.
1521                          * We can also be here if we receive packets while
1522                          * the driver is going down, because then dev is NULL.
1523                          */
1524                         dev_kfree_skb_irq(skb);
1525                         continue;
1526                 }
1527
1528                 port = (struct veth_port *)dev->priv;
1529                 dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
1530
1531                 if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
1532                         dev_kfree_skb_irq(skb);
1533                         continue;
1534                 }
1535                 if (! veth_frame_wanted(port, dest)) {
1536                         dev_kfree_skb_irq(skb);
1537                         continue;
1538                 }
1539
1540                 skb_put(skb, length);
1541                 skb->dev = dev;
1542                 skb->protocol = eth_type_trans(skb, dev);
1543                 skb->ip_summed = CHECKSUM_NONE;
1544                 netif_rx(skb);  /* send it up */
1545                 port->stats.rx_packets++;
1546                 port->stats.rx_bytes += length;
1547         } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
1548
1549         /* Ack it */
1550         spin_lock_irqsave(&cnx->lock, flags);
1551         BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
1552
1553         cnx->pending_acks[cnx->num_pending_acks++] =
1554                 event->base_event.xCorrelationToken;
1555
1556         if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
1557              || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
1558                 veth_flush_acks(cnx);
1559
1560         spin_unlock_irqrestore(&cnx->lock, flags);
1561 }
1562
1563 static void veth_timed_ack(unsigned long ptr)
1564 {
1565         struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
1566         unsigned long flags;
1567
1568         /* Ack all the events */
1569         spin_lock_irqsave(&cnx->lock, flags);
1570         if (cnx->num_pending_acks > 0)
1571                 veth_flush_acks(cnx);
1572
1573         /* Reschedule the timer */
1574         cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
1575         add_timer(&cnx->ack_timer);
1576         spin_unlock_irqrestore(&cnx->lock, flags);
1577 }
1578
1579 static int veth_remove(struct vio_dev *vdev)
1580 {
1581         struct veth_lpar_connection *cnx;
1582         struct net_device *dev;
1583         struct veth_port *port;
1584         int i;
1585
1586         dev = veth_dev[vdev->unit_address];
1587
1588         if (! dev)
1589                 return 0;
1590
1591         port = netdev_priv(dev);
1592
1593         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1594                 cnx = veth_cnx[i];
1595
1596                 if (cnx && (port->lpar_map & (1 << i))) {
1597                         /* Drop our reference to connections on our VLAN */
1598                         kobject_put(&cnx->kobject);
1599                 }
1600         }
1601
1602         veth_dev[vdev->unit_address] = NULL;
1603         kobject_del(&port->kobject);
1604         kobject_put(&port->kobject);
1605         unregister_netdev(dev);
1606         free_netdev(dev);
1607
1608         return 0;
1609 }
1610
1611 static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1612 {
1613         int i = vdev->unit_address;
1614         struct net_device *dev;
1615         struct veth_port *port;
1616
1617         dev = veth_probe_one(i, vdev);
1618         if (dev == NULL) {
1619                 veth_remove(vdev);
1620                 return 1;
1621         }
1622         veth_dev[i] = dev;
1623
1624         port = (struct veth_port*)netdev_priv(dev);
1625
1626         /* Start the state machine on each connection on this vlan. If we're
1627          * the first dev to do so this will commence link negotiation */
1628         for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1629                 struct veth_lpar_connection *cnx;
1630
1631                 if (! (port->lpar_map & (1 << i)))
1632                         continue;
1633
1634                 cnx = veth_cnx[i];
1635                 if (!cnx)
1636                         continue;
1637
1638                 kobject_get(&cnx->kobject);
1639                 veth_kick_statemachine(cnx);
1640         }
1641
1642         return 0;
1643 }
1644
1645 /**
1646  * veth_device_table: Used by vio.c to match devices that we
1647  * support.
1648  */
1649 static struct vio_device_id veth_device_table[] __devinitdata = {
1650         { "network", "IBM,iSeries-l-lan" },
1651         { "", "" }
1652 };
1653 MODULE_DEVICE_TABLE(vio, veth_device_table);
1654
1655 static struct vio_driver veth_driver = {
1656         .id_table = veth_device_table,
1657         .probe = veth_probe,
1658         .remove = veth_remove,
1659         .driver = {
1660                 .name = DRV_NAME,
1661                 .owner = THIS_MODULE,
1662         }
1663 };
1664
1665 /*
1666  * Module initialization/cleanup
1667  */
1668
1669 void __exit veth_module_cleanup(void)
1670 {
1671         int i;
1672         struct veth_lpar_connection *cnx;
1673
1674         /* Disconnect our "irq" to stop events coming from the Hypervisor. */
1675         HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
1676
1677         /* Make sure any work queued from Hypervisor callbacks is finished. */
1678         flush_scheduled_work();
1679
1680         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1681                 cnx = veth_cnx[i];
1682
1683                 if (!cnx)
1684                         continue;
1685
1686                 /* Remove the connection from sysfs */
1687                 kobject_del(&cnx->kobject);
1688                 /* Drop the driver's reference to the connection */
1689                 kobject_put(&cnx->kobject);
1690         }
1691
1692         /* Unregister the driver, which will close all the netdevs and stop
1693          * the connections when they're no longer referenced. */
1694         vio_unregister_driver(&veth_driver);
1695 }
1696 module_exit(veth_module_cleanup);
1697
1698 int __init veth_module_init(void)
1699 {
1700         int i;
1701         int rc;
1702
1703         this_lp = HvLpConfig_getLpIndex_outline();
1704
1705         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1706                 rc = veth_init_connection(i);
1707                 if (rc != 0)
1708                         goto error;
1709         }
1710
1711         HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
1712                                   &veth_handle_event);
1713
1714         rc = vio_register_driver(&veth_driver);
1715         if (rc != 0)
1716                 goto error;
1717
1718         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1719                 struct kobject *kobj;
1720
1721                 if (!veth_cnx[i])
1722                         continue;
1723
1724                 kobj = &veth_cnx[i]->kobject;
1725                 kobj->parent = &veth_driver.driver.kobj;
1726                 /* If the add failes, complain but otherwise continue */
1727                 if (0 != kobject_add(kobj))
1728                         veth_error("cnx %d: Failed adding to sysfs.\n", i);
1729         }
1730
1731         return 0;
1732
1733 error:
1734         for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1735                 veth_destroy_connection(veth_cnx[i]);
1736         }
1737
1738         return rc;
1739 }
1740 module_init(veth_module_init);