iwmc3200wifi: Implement cfg80211 PMKSA API
[linux/fpc-iii.git] / drivers / misc / sgi-xp / xpnet.c
blob16f0abda1423bf43e0604a5484e261d52651efa6
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.
6 * Copyright (C) 1999-2009 Silicon Graphics, Inc. All rights reserved.
7 */
9 /*
10 * Cross Partition Network Interface (XPNET) support
12 * XPNET provides a virtual network layered on top of the Cross
13 * Partition communication layer.
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.
23 #include <linux/module.h>
24 #include <linux/netdevice.h>
25 #include <linux/etherdevice.h>
26 #include "xp.h"
29 * The message payload transferred by XPC.
31 * buf_pa is the physical address where the DMA should pull from.
33 * NOTE: for performance reasons, buf_pa should _ALWAYS_ begin on a
34 * cacheline boundary. To accomplish this, we record the number of
35 * bytes from the beginning of the first cacheline to the first useful
36 * byte of the skb (leadin_ignore) and the number of bytes from the
37 * last useful byte of the skb to the end of the last cacheline
38 * (tailout_ignore).
40 * size is the number of bytes to transfer which includes the skb->len
41 * (useful bytes of the senders skb) plus the leadin and tailout
43 struct xpnet_message {
44 u16 version; /* Version for this message */
45 u16 embedded_bytes; /* #of bytes embedded in XPC message */
46 u32 magic; /* Special number indicating this is xpnet */
47 unsigned long buf_pa; /* phys address of buffer to retrieve */
48 u32 size; /* #of bytes in buffer */
49 u8 leadin_ignore; /* #of bytes to ignore at the beginning */
50 u8 tailout_ignore; /* #of bytes to ignore at the end */
51 unsigned char data; /* body of small packets */
55 * Determine the size of our message, the cacheline aligned size,
56 * and then the number of message will request from XPC.
58 * XPC expects each message to exist in an individual cacheline.
60 #define XPNET_MSG_SIZE XPC_MSG_PAYLOAD_MAX_SIZE
61 #define XPNET_MSG_DATA_MAX \
62 (XPNET_MSG_SIZE - offsetof(struct xpnet_message, data))
63 #define XPNET_MSG_NENTRIES (PAGE_SIZE / XPC_MSG_MAX_SIZE)
65 #define XPNET_MAX_KTHREADS (XPNET_MSG_NENTRIES + 1)
66 #define XPNET_MAX_IDLE_KTHREADS (XPNET_MSG_NENTRIES + 1)
69 * Version number of XPNET implementation. XPNET can always talk to versions
70 * with same major #, and never talk to versions with a different version.
72 #define _XPNET_VERSION(_major, _minor) (((_major) << 4) | (_minor))
73 #define XPNET_VERSION_MAJOR(_v) ((_v) >> 4)
74 #define XPNET_VERSION_MINOR(_v) ((_v) & 0xf)
76 #define XPNET_VERSION _XPNET_VERSION(1, 0) /* version 1.0 */
77 #define XPNET_VERSION_EMBED _XPNET_VERSION(1, 1) /* version 1.1 */
78 #define XPNET_MAGIC 0x88786984 /* "XNET" */
80 #define XPNET_VALID_MSG(_m) \
81 ((XPNET_VERSION_MAJOR(_m->version) == XPNET_VERSION_MAJOR(XPNET_VERSION)) \
82 && (msg->magic == XPNET_MAGIC))
84 #define XPNET_DEVICE_NAME "xp0"
87 * When messages are queued with xpc_send_notify, a kmalloc'd buffer
88 * of the following type is passed as a notification cookie. When the
89 * notification function is called, we use the cookie to decide
90 * whether all outstanding message sends have completed. The skb can
91 * then be released.
93 struct xpnet_pending_msg {
94 struct sk_buff *skb;
95 atomic_t use_count;
98 struct net_device *xpnet_device;
101 * When we are notified of other partitions activating, we add them to
102 * our bitmask of partitions to which we broadcast.
104 static unsigned long *xpnet_broadcast_partitions;
105 /* protect above */
106 static DEFINE_SPINLOCK(xpnet_broadcast_lock);
109 * Since the Block Transfer Engine (BTE) is being used for the transfer
110 * and it relies upon cache-line size transfers, we need to reserve at
111 * least one cache-line for head and tail alignment. The BTE is
112 * limited to 8MB transfers.
114 * Testing has shown that changing MTU to greater than 64KB has no effect
115 * on TCP as the two sides negotiate a Max Segment Size that is limited
116 * to 64K. Other protocols May use packets greater than this, but for
117 * now, the default is 64KB.
119 #define XPNET_MAX_MTU (0x800000UL - L1_CACHE_BYTES)
120 /* 32KB has been determined to be the ideal */
121 #define XPNET_DEF_MTU (0x8000UL)
124 * The partid is encapsulated in the MAC address beginning in the following
125 * octet and it consists of two octets.
127 #define XPNET_PARTID_OCTET 2
129 /* Define the XPNET debug device structures to be used with dev_dbg() et al */
131 struct device_driver xpnet_dbg_name = {
132 .name = "xpnet"
135 struct device xpnet_dbg_subname = {
136 .init_name = "", /* set to "" */
137 .driver = &xpnet_dbg_name
140 struct device *xpnet = &xpnet_dbg_subname;
143 * Packet was recevied by XPC and forwarded to us.
145 static void
146 xpnet_receive(short partid, int channel, struct xpnet_message *msg)
148 struct sk_buff *skb;
149 void *dst;
150 enum xp_retval ret;
152 if (!XPNET_VALID_MSG(msg)) {
154 * Packet with a different XPC version. Ignore.
156 xpc_received(partid, channel, (void *)msg);
158 xpnet_device->stats.rx_errors++;
160 return;
162 dev_dbg(xpnet, "received 0x%lx, %d, %d, %d\n", msg->buf_pa, msg->size,
163 msg->leadin_ignore, msg->tailout_ignore);
165 /* reserve an extra cache line */
166 skb = dev_alloc_skb(msg->size + L1_CACHE_BYTES);
167 if (!skb) {
168 dev_err(xpnet, "failed on dev_alloc_skb(%d)\n",
169 msg->size + L1_CACHE_BYTES);
171 xpc_received(partid, channel, (void *)msg);
173 xpnet_device->stats.rx_errors++;
175 return;
179 * The allocated skb has some reserved space.
180 * In order to use xp_remote_memcpy(), we need to get the
181 * skb->data pointer moved forward.
183 skb_reserve(skb, (L1_CACHE_BYTES - ((u64)skb->data &
184 (L1_CACHE_BYTES - 1)) +
185 msg->leadin_ignore));
188 * Update the tail pointer to indicate data actually
189 * transferred.
191 skb_put(skb, (msg->size - msg->leadin_ignore - msg->tailout_ignore));
194 * Move the data over from the other side.
196 if ((XPNET_VERSION_MINOR(msg->version) == 1) &&
197 (msg->embedded_bytes != 0)) {
198 dev_dbg(xpnet, "copying embedded message. memcpy(0x%p, 0x%p, "
199 "%lu)\n", skb->data, &msg->data,
200 (size_t)msg->embedded_bytes);
202 skb_copy_to_linear_data(skb, &msg->data,
203 (size_t)msg->embedded_bytes);
204 } else {
205 dst = (void *)((u64)skb->data & ~(L1_CACHE_BYTES - 1));
206 dev_dbg(xpnet, "transferring buffer to the skb->data area;\n\t"
207 "xp_remote_memcpy(0x%p, 0x%p, %hu)\n", dst,
208 (void *)msg->buf_pa, msg->size);
210 ret = xp_remote_memcpy(xp_pa(dst), msg->buf_pa, msg->size);
211 if (ret != xpSuccess) {
213 * !!! Need better way of cleaning skb. Currently skb
214 * !!! appears in_use and we can't just call
215 * !!! dev_kfree_skb.
217 dev_err(xpnet, "xp_remote_memcpy(0x%p, 0x%p, 0x%hx) "
218 "returned error=0x%x\n", dst,
219 (void *)msg->buf_pa, msg->size, ret);
221 xpc_received(partid, channel, (void *)msg);
223 xpnet_device->stats.rx_errors++;
225 return;
229 dev_dbg(xpnet, "<skb->head=0x%p skb->data=0x%p skb->tail=0x%p "
230 "skb->end=0x%p skb->len=%d\n", (void *)skb->head,
231 (void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb),
232 skb->len);
234 skb->protocol = eth_type_trans(skb, xpnet_device);
235 skb->ip_summed = CHECKSUM_UNNECESSARY;
237 dev_dbg(xpnet, "passing skb to network layer\n"
238 "\tskb->head=0x%p skb->data=0x%p skb->tail=0x%p "
239 "skb->end=0x%p skb->len=%d\n",
240 (void *)skb->head, (void *)skb->data, skb_tail_pointer(skb),
241 skb_end_pointer(skb), skb->len);
243 xpnet_device->stats.rx_packets++;
244 xpnet_device->stats.rx_bytes += skb->len + ETH_HLEN;
246 netif_rx_ni(skb);
247 xpc_received(partid, channel, (void *)msg);
251 * This is the handler which XPC calls during any sort of change in
252 * state or message reception on a connection.
254 static void
255 xpnet_connection_activity(enum xp_retval reason, short partid, int channel,
256 void *data, void *key)
258 DBUG_ON(partid < 0 || partid >= xp_max_npartitions);
259 DBUG_ON(channel != XPC_NET_CHANNEL);
261 switch (reason) {
262 case xpMsgReceived: /* message received */
263 DBUG_ON(data == NULL);
265 xpnet_receive(partid, channel, (struct xpnet_message *)data);
266 break;
268 case xpConnected: /* connection completed to a partition */
269 spin_lock_bh(&xpnet_broadcast_lock);
270 __set_bit(partid, xpnet_broadcast_partitions);
271 spin_unlock_bh(&xpnet_broadcast_lock);
273 netif_carrier_on(xpnet_device);
275 dev_dbg(xpnet, "%s connected to partition %d\n",
276 xpnet_device->name, partid);
277 break;
279 default:
280 spin_lock_bh(&xpnet_broadcast_lock);
281 __clear_bit(partid, xpnet_broadcast_partitions);
282 spin_unlock_bh(&xpnet_broadcast_lock);
284 if (bitmap_empty((unsigned long *)xpnet_broadcast_partitions,
285 xp_max_npartitions)) {
286 netif_carrier_off(xpnet_device);
289 dev_dbg(xpnet, "%s disconnected from partition %d\n",
290 xpnet_device->name, partid);
291 break;
295 static int
296 xpnet_dev_open(struct net_device *dev)
298 enum xp_retval ret;
300 dev_dbg(xpnet, "calling xpc_connect(%d, 0x%p, NULL, %ld, %ld, %ld, "
301 "%ld)\n", XPC_NET_CHANNEL, xpnet_connection_activity,
302 (unsigned long)XPNET_MSG_SIZE,
303 (unsigned long)XPNET_MSG_NENTRIES,
304 (unsigned long)XPNET_MAX_KTHREADS,
305 (unsigned long)XPNET_MAX_IDLE_KTHREADS);
307 ret = xpc_connect(XPC_NET_CHANNEL, xpnet_connection_activity, NULL,
308 XPNET_MSG_SIZE, XPNET_MSG_NENTRIES,
309 XPNET_MAX_KTHREADS, XPNET_MAX_IDLE_KTHREADS);
310 if (ret != xpSuccess) {
311 dev_err(xpnet, "ifconfig up of %s failed on XPC connect, "
312 "ret=%d\n", dev->name, ret);
314 return -ENOMEM;
317 dev_dbg(xpnet, "ifconfig up of %s; XPC connected\n", dev->name);
319 return 0;
322 static int
323 xpnet_dev_stop(struct net_device *dev)
325 xpc_disconnect(XPC_NET_CHANNEL);
327 dev_dbg(xpnet, "ifconfig down of %s; XPC disconnected\n", dev->name);
329 return 0;
332 static int
333 xpnet_dev_change_mtu(struct net_device *dev, int new_mtu)
335 /* 68 comes from min TCP+IP+MAC header */
336 if ((new_mtu < 68) || (new_mtu > XPNET_MAX_MTU)) {
337 dev_err(xpnet, "ifconfig %s mtu %d failed; value must be "
338 "between 68 and %ld\n", dev->name, new_mtu,
339 XPNET_MAX_MTU);
340 return -EINVAL;
343 dev->mtu = new_mtu;
344 dev_dbg(xpnet, "ifconfig %s mtu set to %d\n", dev->name, new_mtu);
345 return 0;
349 * Notification that the other end has received the message and
350 * DMA'd the skb information. At this point, they are done with
351 * our side. When all recipients are done processing, we
352 * release the skb and then release our pending message structure.
354 static void
355 xpnet_send_completed(enum xp_retval reason, short partid, int channel,
356 void *__qm)
358 struct xpnet_pending_msg *queued_msg = (struct xpnet_pending_msg *)__qm;
360 DBUG_ON(queued_msg == NULL);
362 dev_dbg(xpnet, "message to %d notified with reason %d\n",
363 partid, reason);
365 if (atomic_dec_return(&queued_msg->use_count) == 0) {
366 dev_dbg(xpnet, "all acks for skb->head=-x%p\n",
367 (void *)queued_msg->skb->head);
369 dev_kfree_skb_any(queued_msg->skb);
370 kfree(queued_msg);
374 static void
375 xpnet_send(struct sk_buff *skb, struct xpnet_pending_msg *queued_msg,
376 u64 start_addr, u64 end_addr, u16 embedded_bytes, int dest_partid)
378 u8 msg_buffer[XPNET_MSG_SIZE];
379 struct xpnet_message *msg = (struct xpnet_message *)&msg_buffer;
380 u16 msg_size = sizeof(struct xpnet_message);
381 enum xp_retval ret;
383 msg->embedded_bytes = embedded_bytes;
384 if (unlikely(embedded_bytes != 0)) {
385 msg->version = XPNET_VERSION_EMBED;
386 dev_dbg(xpnet, "calling memcpy(0x%p, 0x%p, 0x%lx)\n",
387 &msg->data, skb->data, (size_t)embedded_bytes);
388 skb_copy_from_linear_data(skb, &msg->data,
389 (size_t)embedded_bytes);
390 msg_size += embedded_bytes - 1;
391 } else {
392 msg->version = XPNET_VERSION;
394 msg->magic = XPNET_MAGIC;
395 msg->size = end_addr - start_addr;
396 msg->leadin_ignore = (u64)skb->data - start_addr;
397 msg->tailout_ignore = end_addr - (u64)skb_tail_pointer(skb);
398 msg->buf_pa = xp_pa((void *)start_addr);
400 dev_dbg(xpnet, "sending XPC message to %d:%d\n"
401 "msg->buf_pa=0x%lx, msg->size=%u, "
402 "msg->leadin_ignore=%u, msg->tailout_ignore=%u\n",
403 dest_partid, XPC_NET_CHANNEL, msg->buf_pa, msg->size,
404 msg->leadin_ignore, msg->tailout_ignore);
406 atomic_inc(&queued_msg->use_count);
408 ret = xpc_send_notify(dest_partid, XPC_NET_CHANNEL, XPC_NOWAIT, msg,
409 msg_size, xpnet_send_completed, queued_msg);
410 if (unlikely(ret != xpSuccess))
411 atomic_dec(&queued_msg->use_count);
415 * Network layer has formatted a packet (skb) and is ready to place it
416 * "on the wire". Prepare and send an xpnet_message to all partitions
417 * which have connected with us and are targets of this packet.
419 * MAC-NOTE: For the XPNET driver, the MAC address contains the
420 * destination partid. If the destination partid octets are 0xffff,
421 * this packet is to be broadcast to all connected partitions.
423 static int
424 xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
426 struct xpnet_pending_msg *queued_msg;
427 u64 start_addr, end_addr;
428 short dest_partid;
429 u16 embedded_bytes = 0;
431 dev_dbg(xpnet, ">skb->head=0x%p skb->data=0x%p skb->tail=0x%p "
432 "skb->end=0x%p skb->len=%d\n", (void *)skb->head,
433 (void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb),
434 skb->len);
436 if (skb->data[0] == 0x33) {
437 dev_kfree_skb(skb);
438 return NETDEV_TX_OK; /* nothing needed to be done */
442 * The xpnet_pending_msg tracks how many outstanding
443 * xpc_send_notifies are relying on this skb. When none
444 * remain, release the skb.
446 queued_msg = kmalloc(sizeof(struct xpnet_pending_msg), GFP_ATOMIC);
447 if (queued_msg == NULL) {
448 dev_warn(xpnet, "failed to kmalloc %ld bytes; dropping "
449 "packet\n", sizeof(struct xpnet_pending_msg));
451 dev->stats.tx_errors++;
452 dev_kfree_skb(skb);
453 return NETDEV_TX_OK;
456 /* get the beginning of the first cacheline and end of last */
457 start_addr = ((u64)skb->data & ~(L1_CACHE_BYTES - 1));
458 end_addr = L1_CACHE_ALIGN((u64)skb_tail_pointer(skb));
460 /* calculate how many bytes to embed in the XPC message */
461 if (unlikely(skb->len <= XPNET_MSG_DATA_MAX)) {
462 /* skb->data does fit so embed */
463 embedded_bytes = skb->len;
467 * Since the send occurs asynchronously, we set the count to one
468 * and begin sending. Any sends that happen to complete before
469 * we are done sending will not free the skb. We will be left
470 * with that task during exit. This also handles the case of
471 * a packet destined for a partition which is no longer up.
473 atomic_set(&queued_msg->use_count, 1);
474 queued_msg->skb = skb;
476 if (skb->data[0] == 0xff) {
477 /* we are being asked to broadcast to all partitions */
478 for_each_bit(dest_partid, xpnet_broadcast_partitions,
479 xp_max_npartitions) {
481 xpnet_send(skb, queued_msg, start_addr, end_addr,
482 embedded_bytes, dest_partid);
484 } else {
485 dest_partid = (short)skb->data[XPNET_PARTID_OCTET + 1];
486 dest_partid |= (short)skb->data[XPNET_PARTID_OCTET + 0] << 8;
488 if (dest_partid >= 0 &&
489 dest_partid < xp_max_npartitions &&
490 test_bit(dest_partid, xpnet_broadcast_partitions) != 0) {
492 xpnet_send(skb, queued_msg, start_addr, end_addr,
493 embedded_bytes, dest_partid);
497 if (atomic_dec_return(&queued_msg->use_count) == 0) {
498 dev_kfree_skb(skb);
499 kfree(queued_msg);
502 dev->stats.tx_packets++;
503 dev->stats.tx_bytes += skb->len;
505 return NETDEV_TX_OK;
509 * Deal with transmit timeouts coming from the network layer.
511 static void
512 xpnet_dev_tx_timeout(struct net_device *dev)
514 dev->stats.tx_errors++;
517 static const struct net_device_ops xpnet_netdev_ops = {
518 .ndo_open = xpnet_dev_open,
519 .ndo_stop = xpnet_dev_stop,
520 .ndo_start_xmit = xpnet_dev_hard_start_xmit,
521 .ndo_change_mtu = xpnet_dev_change_mtu,
522 .ndo_tx_timeout = xpnet_dev_tx_timeout,
523 .ndo_set_mac_address = eth_mac_addr,
524 .ndo_validate_addr = eth_validate_addr,
527 static int __init
528 xpnet_init(void)
530 int result;
532 if (!is_shub() && !is_uv())
533 return -ENODEV;
535 dev_info(xpnet, "registering network device %s\n", XPNET_DEVICE_NAME);
537 xpnet_broadcast_partitions = kzalloc(BITS_TO_LONGS(xp_max_npartitions) *
538 sizeof(long), GFP_KERNEL);
539 if (xpnet_broadcast_partitions == NULL)
540 return -ENOMEM;
543 * use ether_setup() to init the majority of our device
544 * structure and then override the necessary pieces.
546 xpnet_device = alloc_netdev(0, XPNET_DEVICE_NAME, ether_setup);
547 if (xpnet_device == NULL) {
548 kfree(xpnet_broadcast_partitions);
549 return -ENOMEM;
552 netif_carrier_off(xpnet_device);
554 xpnet_device->netdev_ops = &xpnet_netdev_ops;
555 xpnet_device->mtu = XPNET_DEF_MTU;
558 * Multicast assumes the LSB of the first octet is set for multicast
559 * MAC addresses. We chose the first octet of the MAC to be unlikely
560 * to collide with any vendor's officially issued MAC.
562 xpnet_device->dev_addr[0] = 0x02; /* locally administered, no OUI */
564 xpnet_device->dev_addr[XPNET_PARTID_OCTET + 1] = xp_partition_id;
565 xpnet_device->dev_addr[XPNET_PARTID_OCTET + 0] = (xp_partition_id >> 8);
568 * ether_setup() sets this to a multicast device. We are
569 * really not supporting multicast at this time.
571 xpnet_device->flags &= ~IFF_MULTICAST;
574 * No need to checksum as it is a DMA transfer. The BTE will
575 * report an error if the data is not retrievable and the
576 * packet will be dropped.
578 xpnet_device->features = NETIF_F_NO_CSUM;
580 result = register_netdev(xpnet_device);
581 if (result != 0) {
582 free_netdev(xpnet_device);
583 kfree(xpnet_broadcast_partitions);
586 return result;
589 module_init(xpnet_init);
591 static void __exit
592 xpnet_exit(void)
594 dev_info(xpnet, "unregistering network device %s\n",
595 xpnet_device[0].name);
597 unregister_netdev(xpnet_device);
598 free_netdev(xpnet_device);
599 kfree(xpnet_broadcast_partitions);
602 module_exit(xpnet_exit);
604 MODULE_AUTHOR("Silicon Graphics, Inc.");
605 MODULE_DESCRIPTION("Cross Partition Network adapter (XPNET)");
606 MODULE_LICENSE("GPL");