xpnet.c revision a7b4d509205db5e9cd3ffc77b306d7b10fe6a34d
1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1999-2008 Silicon Graphics, Inc. All rights reserved. 7 */ 8 9/* 10 * Cross Partition Network Interface (XPNET) support 11 * 12 * XPNET provides a virtual network layered on top of the Cross 13 * Partition communication layer. 14 * 15 * XPNET provides direct point-to-point and broadcast-like support 16 * for an ethernet-like device. The ethernet broadcast medium is 17 * replaced with a point-to-point message structure which passes 18 * pointers to a DMA-capable block that a remote partition should 19 * retrieve and pass to the upper level networking layer. 20 * 21 */ 22 23#include <linux/module.h> 24#include <linux/kernel.h> 25#include <linux/init.h> 26#include <linux/ioport.h> 27#include <linux/netdevice.h> 28#include <linux/etherdevice.h> 29#include <linux/delay.h> 30#include <linux/ethtool.h> 31#include <linux/mii.h> 32#include <linux/smp.h> 33#include <linux/string.h> 34#include <asm/atomic.h> 35#include "xp.h" 36 37/* 38 * The message payload transferred by XPC. 39 * 40 * buf_pa is the physical address where the DMA should pull from. 41 * 42 * NOTE: for performance reasons, buf_pa should _ALWAYS_ begin on a 43 * cacheline boundary. To accomplish this, we record the number of 44 * bytes from the beginning of the first cacheline to the first useful 45 * byte of the skb (leadin_ignore) and the number of bytes from the 46 * last useful byte of the skb to the end of the last cacheline 47 * (tailout_ignore). 48 * 49 * size is the number of bytes to transfer which includes the skb->len 50 * (useful bytes of the senders skb) plus the leadin and tailout 51 */ 52struct xpnet_message { 53 u16 version; /* Version for this message */ 54 u16 embedded_bytes; /* #of bytes embedded in XPC message */ 55 u32 magic; /* Special number indicating this is xpnet */ 56 u64 buf_pa; /* phys address of buffer to retrieve */ 57 u32 size; /* #of bytes in buffer */ 58 u8 leadin_ignore; /* #of bytes to ignore at the beginning */ 59 u8 tailout_ignore; /* #of bytes to ignore at the end */ 60 unsigned char data; /* body of small packets */ 61}; 62 63/* 64 * Determine the size of our message, the cacheline aligned size, 65 * and then the number of message will request from XPC. 66 * 67 * XPC expects each message to exist in an individual cacheline. 68 */ 69#define XPNET_MSG_SIZE (L1_CACHE_BYTES - XPC_MSG_PAYLOAD_OFFSET) 70#define XPNET_MSG_DATA_MAX \ 71 (XPNET_MSG_SIZE - (u64)(&((struct xpnet_message *)0)->data)) 72#define XPNET_MSG_ALIGNED_SIZE (L1_CACHE_ALIGN(XPNET_MSG_SIZE)) 73#define XPNET_MSG_NENTRIES (PAGE_SIZE / XPNET_MSG_ALIGNED_SIZE) 74 75#define XPNET_MAX_KTHREADS (XPNET_MSG_NENTRIES + 1) 76#define XPNET_MAX_IDLE_KTHREADS (XPNET_MSG_NENTRIES + 1) 77 78/* 79 * Version number of XPNET implementation. XPNET can always talk to versions 80 * with same major #, and never talk to versions with a different version. 81 */ 82#define _XPNET_VERSION(_major, _minor) (((_major) << 4) | (_minor)) 83#define XPNET_VERSION_MAJOR(_v) ((_v) >> 4) 84#define XPNET_VERSION_MINOR(_v) ((_v) & 0xf) 85 86#define XPNET_VERSION _XPNET_VERSION(1, 0) /* version 1.0 */ 87#define XPNET_VERSION_EMBED _XPNET_VERSION(1, 1) /* version 1.1 */ 88#define XPNET_MAGIC 0x88786984 /* "XNET" */ 89 90#define XPNET_VALID_MSG(_m) \ 91 ((XPNET_VERSION_MAJOR(_m->version) == XPNET_VERSION_MAJOR(XPNET_VERSION)) \ 92 && (msg->magic == XPNET_MAGIC)) 93 94#define XPNET_DEVICE_NAME "xp0" 95 96/* 97 * When messages are queued with xpc_send_notify, a kmalloc'd buffer 98 * of the following type is passed as a notification cookie. When the 99 * notification function is called, we use the cookie to decide 100 * whether all outstanding message sends have completed. The skb can 101 * then be released. 102 */ 103struct xpnet_pending_msg { 104 struct sk_buff *skb; 105 atomic_t use_count; 106}; 107 108/* driver specific structure pointed to by the device structure */ 109struct xpnet_dev_private { 110 struct net_device_stats stats; 111}; 112 113struct net_device *xpnet_device; 114 115/* 116 * When we are notified of other partitions activating, we add them to 117 * our bitmask of partitions to which we broadcast. 118 */ 119static unsigned long *xpnet_broadcast_partitions; 120/* protect above */ 121static DEFINE_SPINLOCK(xpnet_broadcast_lock); 122 123/* 124 * Since the Block Transfer Engine (BTE) is being used for the transfer 125 * and it relies upon cache-line size transfers, we need to reserve at 126 * least one cache-line for head and tail alignment. The BTE is 127 * limited to 8MB transfers. 128 * 129 * Testing has shown that changing MTU to greater than 64KB has no effect 130 * on TCP as the two sides negotiate a Max Segment Size that is limited 131 * to 64K. Other protocols May use packets greater than this, but for 132 * now, the default is 64KB. 133 */ 134#define XPNET_MAX_MTU (0x800000UL - L1_CACHE_BYTES) 135/* 32KB has been determined to be the ideal */ 136#define XPNET_DEF_MTU (0x8000UL) 137 138/* 139 * The partid is encapsulated in the MAC address beginning in the following 140 * octet and it consists of two octets. 141 */ 142#define XPNET_PARTID_OCTET 2 143 144/* Define the XPNET debug device structures to be used with dev_dbg() et al */ 145 146struct device_driver xpnet_dbg_name = { 147 .name = "xpnet" 148}; 149 150struct device xpnet_dbg_subname = { 151 .bus_id = {0}, /* set to "" */ 152 .driver = &xpnet_dbg_name 153}; 154 155struct device *xpnet = &xpnet_dbg_subname; 156 157/* 158 * Packet was recevied by XPC and forwarded to us. 159 */ 160static void 161xpnet_receive(short partid, int channel, struct xpnet_message *msg) 162{ 163 struct sk_buff *skb; 164 enum xp_retval ret; 165 struct xpnet_dev_private *priv = 166 (struct xpnet_dev_private *)xpnet_device->priv; 167 168 if (!XPNET_VALID_MSG(msg)) { 169 /* 170 * Packet with a different XPC version. Ignore. 171 */ 172 xpc_received(partid, channel, (void *)msg); 173 174 priv->stats.rx_errors++; 175 176 return; 177 } 178 dev_dbg(xpnet, "received 0x%lx, %d, %d, %d\n", msg->buf_pa, msg->size, 179 msg->leadin_ignore, msg->tailout_ignore); 180 181 /* reserve an extra cache line */ 182 skb = dev_alloc_skb(msg->size + L1_CACHE_BYTES); 183 if (!skb) { 184 dev_err(xpnet, "failed on dev_alloc_skb(%d)\n", 185 msg->size + L1_CACHE_BYTES); 186 187 xpc_received(partid, channel, (void *)msg); 188 189 priv->stats.rx_errors++; 190 191 return; 192 } 193 194 /* 195 * The allocated skb has some reserved space. 196 * In order to use xp_remote_memcpy(), we need to get the 197 * skb->data pointer moved forward. 198 */ 199 skb_reserve(skb, (L1_CACHE_BYTES - ((u64)skb->data & 200 (L1_CACHE_BYTES - 1)) + 201 msg->leadin_ignore)); 202 203 /* 204 * Update the tail pointer to indicate data actually 205 * transferred. 206 */ 207 skb_put(skb, (msg->size - msg->leadin_ignore - msg->tailout_ignore)); 208 209 /* 210 * Move the data over from the other side. 211 */ 212 if ((XPNET_VERSION_MINOR(msg->version) == 1) && 213 (msg->embedded_bytes != 0)) { 214 dev_dbg(xpnet, "copying embedded message. memcpy(0x%p, 0x%p, " 215 "%lu)\n", skb->data, &msg->data, 216 (size_t)msg->embedded_bytes); 217 218 skb_copy_to_linear_data(skb, &msg->data, 219 (size_t)msg->embedded_bytes); 220 } else { 221 dev_dbg(xpnet, "transferring buffer to the skb->data area;\n\t" 222 "xp_remote_memcpy(0x%p, 0x%p, %hu)\n", (void *) 223 ((u64)skb->data & ~(L1_CACHE_BYTES - 1)), 224 (void *)msg->buf_pa, msg->size); 225 226 ret = xp_remote_memcpy((void *)((u64)skb->data & 227 ~(L1_CACHE_BYTES - 1)), 228 (void *)msg->buf_pa, msg->size); 229 230 if (ret != xpSuccess) { 231 /* 232 * >>> Need better way of cleaning skb. Currently skb 233 * >>> appears in_use and we can't just call 234 * >>> dev_kfree_skb. 235 */ 236 dev_err(xpnet, "xp_remote_memcpy(0x%p, 0x%p, 0x%hx) " 237 "returned error=0x%x\n", (void *) 238 ((u64)skb->data & ~(L1_CACHE_BYTES - 1)), 239 (void *)msg->buf_pa, msg->size, ret); 240 241 xpc_received(partid, channel, (void *)msg); 242 243 priv->stats.rx_errors++; 244 245 return; 246 } 247 } 248 249 dev_dbg(xpnet, "<skb->head=0x%p skb->data=0x%p skb->tail=0x%p " 250 "skb->end=0x%p skb->len=%d\n", (void *)skb->head, 251 (void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb), 252 skb->len); 253 254 skb->protocol = eth_type_trans(skb, xpnet_device); 255 skb->ip_summed = CHECKSUM_UNNECESSARY; 256 257 dev_dbg(xpnet, "passing skb to network layer\n" 258 KERN_DEBUG "\tskb->head=0x%p skb->data=0x%p skb->tail=0x%p " 259 "skb->end=0x%p skb->len=%d\n", 260 (void *)skb->head, (void *)skb->data, skb_tail_pointer(skb), 261 skb_end_pointer(skb), skb->len); 262 263 xpnet_device->last_rx = jiffies; 264 priv->stats.rx_packets++; 265 priv->stats.rx_bytes += skb->len + ETH_HLEN; 266 267 netif_rx_ni(skb); 268 xpc_received(partid, channel, (void *)msg); 269} 270 271/* 272 * This is the handler which XPC calls during any sort of change in 273 * state or message reception on a connection. 274 */ 275static void 276xpnet_connection_activity(enum xp_retval reason, short partid, int channel, 277 void *data, void *key) 278{ 279 DBUG_ON(partid < 0 || partid >= xp_max_npartitions); 280 DBUG_ON(channel != XPC_NET_CHANNEL); 281 282 switch (reason) { 283 case xpMsgReceived: /* message received */ 284 DBUG_ON(data == NULL); 285 286 xpnet_receive(partid, channel, (struct xpnet_message *)data); 287 break; 288 289 case xpConnected: /* connection completed to a partition */ 290 spin_lock_bh(&xpnet_broadcast_lock); 291 __set_bit(partid, xpnet_broadcast_partitions); 292 spin_unlock_bh(&xpnet_broadcast_lock); 293 294 netif_carrier_on(xpnet_device); 295 296 dev_dbg(xpnet, "%s connected to partition %d\n", 297 xpnet_device->name, partid); 298 break; 299 300 default: 301 spin_lock_bh(&xpnet_broadcast_lock); 302 __clear_bit(partid, xpnet_broadcast_partitions); 303 spin_unlock_bh(&xpnet_broadcast_lock); 304 305 if (bitmap_empty((unsigned long *)xpnet_broadcast_partitions, 306 xp_max_npartitions)) { 307 netif_carrier_off(xpnet_device); 308 } 309 310 dev_dbg(xpnet, "%s disconnected from partition %d\n", 311 xpnet_device->name, partid); 312 break; 313 } 314} 315 316static int 317xpnet_dev_open(struct net_device *dev) 318{ 319 enum xp_retval ret; 320 321 dev_dbg(xpnet, "calling xpc_connect(%d, 0x%p, NULL, %ld, %ld, %ld, " 322 "%ld)\n", XPC_NET_CHANNEL, xpnet_connection_activity, 323 XPNET_MSG_SIZE, XPNET_MSG_NENTRIES, XPNET_MAX_KTHREADS, 324 XPNET_MAX_IDLE_KTHREADS); 325 326 ret = xpc_connect(XPC_NET_CHANNEL, xpnet_connection_activity, NULL, 327 XPNET_MSG_SIZE, XPNET_MSG_NENTRIES, 328 XPNET_MAX_KTHREADS, XPNET_MAX_IDLE_KTHREADS); 329 if (ret != xpSuccess) { 330 dev_err(xpnet, "ifconfig up of %s failed on XPC connect, " 331 "ret=%d\n", dev->name, ret); 332 333 return -ENOMEM; 334 } 335 336 dev_dbg(xpnet, "ifconfig up of %s; XPC connected\n", dev->name); 337 338 return 0; 339} 340 341static int 342xpnet_dev_stop(struct net_device *dev) 343{ 344 xpc_disconnect(XPC_NET_CHANNEL); 345 346 dev_dbg(xpnet, "ifconfig down of %s; XPC disconnected\n", dev->name); 347 348 return 0; 349} 350 351static int 352xpnet_dev_change_mtu(struct net_device *dev, int new_mtu) 353{ 354 /* 68 comes from min TCP+IP+MAC header */ 355 if ((new_mtu < 68) || (new_mtu > XPNET_MAX_MTU)) { 356 dev_err(xpnet, "ifconfig %s mtu %d failed; value must be " 357 "between 68 and %ld\n", dev->name, new_mtu, 358 XPNET_MAX_MTU); 359 return -EINVAL; 360 } 361 362 dev->mtu = new_mtu; 363 dev_dbg(xpnet, "ifconfig %s mtu set to %d\n", dev->name, new_mtu); 364 return 0; 365} 366 367/* 368 * Required for the net_device structure. 369 */ 370static int 371xpnet_dev_set_config(struct net_device *dev, struct ifmap *new_map) 372{ 373 return 0; 374} 375 376/* 377 * Return statistics to the caller. 378 */ 379static struct net_device_stats * 380xpnet_dev_get_stats(struct net_device *dev) 381{ 382 struct xpnet_dev_private *priv; 383 384 priv = (struct xpnet_dev_private *)dev->priv; 385 386 return &priv->stats; 387} 388 389/* 390 * Notification that the other end has received the message and 391 * DMA'd the skb information. At this point, they are done with 392 * our side. When all recipients are done processing, we 393 * release the skb and then release our pending message structure. 394 */ 395static void 396xpnet_send_completed(enum xp_retval reason, short partid, int channel, 397 void *__qm) 398{ 399 struct xpnet_pending_msg *queued_msg = (struct xpnet_pending_msg *)__qm; 400 401 DBUG_ON(queued_msg == NULL); 402 403 dev_dbg(xpnet, "message to %d notified with reason %d\n", 404 partid, reason); 405 406 if (atomic_dec_return(&queued_msg->use_count) == 0) { 407 dev_dbg(xpnet, "all acks for skb->head=-x%p\n", 408 (void *)queued_msg->skb->head); 409 410 dev_kfree_skb_any(queued_msg->skb); 411 kfree(queued_msg); 412 } 413} 414 415static void 416xpnet_send(struct sk_buff *skb, struct xpnet_pending_msg *queued_msg, 417 u64 start_addr, u64 end_addr, u16 embedded_bytes, int dest_partid) 418{ 419 u8 msg_buffer[XPNET_MSG_SIZE]; 420 struct xpnet_message *msg = (struct xpnet_message *)&msg_buffer; 421 enum xp_retval ret; 422 423 msg->embedded_bytes = embedded_bytes; 424 if (unlikely(embedded_bytes != 0)) { 425 msg->version = XPNET_VERSION_EMBED; 426 dev_dbg(xpnet, "calling memcpy(0x%p, 0x%p, 0x%lx)\n", 427 &msg->data, skb->data, (size_t)embedded_bytes); 428 skb_copy_from_linear_data(skb, &msg->data, 429 (size_t)embedded_bytes); 430 } else { 431 msg->version = XPNET_VERSION; 432 } 433 msg->magic = XPNET_MAGIC; 434 msg->size = end_addr - start_addr; 435 msg->leadin_ignore = (u64)skb->data - start_addr; 436 msg->tailout_ignore = end_addr - (u64)skb_tail_pointer(skb); 437 msg->buf_pa = __pa(start_addr); 438 439 dev_dbg(xpnet, "sending XPC message to %d:%d\n" 440 KERN_DEBUG "msg->buf_pa=0x%lx, msg->size=%u, " 441 "msg->leadin_ignore=%u, msg->tailout_ignore=%u\n", 442 dest_partid, XPC_NET_CHANNEL, msg->buf_pa, msg->size, 443 msg->leadin_ignore, msg->tailout_ignore); 444 445 atomic_inc(&queued_msg->use_count); 446 447 ret = xpc_send_notify(dest_partid, XPC_NET_CHANNEL, XPC_NOWAIT, msg, 448 XPNET_MSG_SIZE, xpnet_send_completed, queued_msg); 449 if (unlikely(ret != xpSuccess)) 450 atomic_dec(&queued_msg->use_count); 451} 452 453/* 454 * Network layer has formatted a packet (skb) and is ready to place it 455 * "on the wire". Prepare and send an xpnet_message to all partitions 456 * which have connected with us and are targets of this packet. 457 * 458 * MAC-NOTE: For the XPNET driver, the MAC address contains the 459 * destination partid. If the destination partid octets are 0xffff, 460 * this packet is to be broadcast to all connected partitions. 461 */ 462static int 463xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) 464{ 465 struct xpnet_pending_msg *queued_msg; 466 u64 start_addr, end_addr; 467 short dest_partid; 468 struct xpnet_dev_private *priv = (struct xpnet_dev_private *)dev->priv; 469 u16 embedded_bytes = 0; 470 471 dev_dbg(xpnet, ">skb->head=0x%p skb->data=0x%p skb->tail=0x%p " 472 "skb->end=0x%p skb->len=%d\n", (void *)skb->head, 473 (void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb), 474 skb->len); 475 476 if (skb->data[0] == 0x33) { 477 dev_kfree_skb(skb); 478 return 0; /* nothing needed to be done */ 479 } 480 481 /* 482 * The xpnet_pending_msg tracks how many outstanding 483 * xpc_send_notifies are relying on this skb. When none 484 * remain, release the skb. 485 */ 486 queued_msg = kmalloc(sizeof(struct xpnet_pending_msg), GFP_ATOMIC); 487 if (queued_msg == NULL) { 488 dev_warn(xpnet, "failed to kmalloc %ld bytes; dropping " 489 "packet\n", sizeof(struct xpnet_pending_msg)); 490 491 priv->stats.tx_errors++; 492 return -ENOMEM; 493 } 494 495 /* get the beginning of the first cacheline and end of last */ 496 start_addr = ((u64)skb->data & ~(L1_CACHE_BYTES - 1)); 497 end_addr = L1_CACHE_ALIGN((u64)skb_tail_pointer(skb)); 498 499 /* calculate how many bytes to embed in the XPC message */ 500 if (unlikely(skb->len <= XPNET_MSG_DATA_MAX)) { 501 /* skb->data does fit so embed */ 502 embedded_bytes = skb->len; 503 } 504 505 /* 506 * Since the send occurs asynchronously, we set the count to one 507 * and begin sending. Any sends that happen to complete before 508 * we are done sending will not free the skb. We will be left 509 * with that task during exit. This also handles the case of 510 * a packet destined for a partition which is no longer up. 511 */ 512 atomic_set(&queued_msg->use_count, 1); 513 queued_msg->skb = skb; 514 515 if (skb->data[0] == 0xff) { 516 /* we are being asked to broadcast to all partitions */ 517 for_each_bit(dest_partid, xpnet_broadcast_partitions, 518 xp_max_npartitions) { 519 520 xpnet_send(skb, queued_msg, start_addr, end_addr, 521 embedded_bytes, dest_partid); 522 } 523 } else { 524 dest_partid = (short)skb->data[XPNET_PARTID_OCTET + 1]; 525 dest_partid |= (short)skb->data[XPNET_PARTID_OCTET + 0] << 8; 526 527 if (dest_partid >= 0 && 528 dest_partid < xp_max_npartitions && 529 test_bit(dest_partid, xpnet_broadcast_partitions) != 0) { 530 531 xpnet_send(skb, queued_msg, start_addr, end_addr, 532 embedded_bytes, dest_partid); 533 } 534 } 535 536 if (atomic_dec_return(&queued_msg->use_count) == 0) { 537 dev_kfree_skb(skb); 538 kfree(queued_msg); 539 } 540 541 priv->stats.tx_packets++; 542 priv->stats.tx_bytes += skb->len; 543 544 return 0; 545} 546 547/* 548 * Deal with transmit timeouts coming from the network layer. 549 */ 550static void 551xpnet_dev_tx_timeout(struct net_device *dev) 552{ 553 struct xpnet_dev_private *priv; 554 555 priv = (struct xpnet_dev_private *)dev->priv; 556 557 priv->stats.tx_errors++; 558 return; 559} 560 561static int __init 562xpnet_init(void) 563{ 564 int result; 565 566 if (!is_shub() && !is_uv()) 567 return -ENODEV; 568 569 dev_info(xpnet, "registering network device %s\n", XPNET_DEVICE_NAME); 570 571 xpnet_broadcast_partitions = kzalloc(BITS_TO_LONGS(xp_max_npartitions) * 572 sizeof(long), GFP_KERNEL); 573 if (xpnet_broadcast_partitions == NULL) 574 return -ENOMEM; 575 576 /* 577 * use ether_setup() to init the majority of our device 578 * structure and then override the necessary pieces. 579 */ 580 xpnet_device = alloc_netdev(sizeof(struct xpnet_dev_private), 581 XPNET_DEVICE_NAME, ether_setup); 582 if (xpnet_device == NULL) { 583 kfree(xpnet_broadcast_partitions); 584 return -ENOMEM; 585 } 586 587 netif_carrier_off(xpnet_device); 588 589 xpnet_device->mtu = XPNET_DEF_MTU; 590 xpnet_device->change_mtu = xpnet_dev_change_mtu; 591 xpnet_device->open = xpnet_dev_open; 592 xpnet_device->get_stats = xpnet_dev_get_stats; 593 xpnet_device->stop = xpnet_dev_stop; 594 xpnet_device->hard_start_xmit = xpnet_dev_hard_start_xmit; 595 xpnet_device->tx_timeout = xpnet_dev_tx_timeout; 596 xpnet_device->set_config = xpnet_dev_set_config; 597 598 /* 599 * Multicast assumes the LSB of the first octet is set for multicast 600 * MAC addresses. We chose the first octet of the MAC to be unlikely 601 * to collide with any vendor's officially issued MAC. 602 */ 603 xpnet_device->dev_addr[0] = 0x02; /* locally administered, no OUI */ 604 605 xpnet_device->dev_addr[XPNET_PARTID_OCTET + 1] = sn_partition_id; 606 xpnet_device->dev_addr[XPNET_PARTID_OCTET + 0] = (sn_partition_id >> 8); 607 608 /* 609 * ether_setup() sets this to a multicast device. We are 610 * really not supporting multicast at this time. 611 */ 612 xpnet_device->flags &= ~IFF_MULTICAST; 613 614 /* 615 * No need to checksum as it is a DMA transfer. The BTE will 616 * report an error if the data is not retrievable and the 617 * packet will be dropped. 618 */ 619 xpnet_device->features = NETIF_F_NO_CSUM; 620 621 result = register_netdev(xpnet_device); 622 if (result != 0) { 623 free_netdev(xpnet_device); 624 kfree(xpnet_broadcast_partitions); 625 } 626 627 return result; 628} 629 630module_init(xpnet_init); 631 632static void __exit 633xpnet_exit(void) 634{ 635 dev_info(xpnet, "unregistering network device %s\n", 636 xpnet_device[0].name); 637 638 unregister_netdev(xpnet_device); 639 free_netdev(xpnet_device); 640 kfree(xpnet_broadcast_partitions); 641} 642 643module_exit(xpnet_exit); 644 645MODULE_AUTHOR("Silicon Graphics, Inc."); 646MODULE_DESCRIPTION("Cross Partition Network adapter (XPNET)"); 647MODULE_LICENSE("GPL"); 648