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Commit | Line | Data |
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a2d974da DN |
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 | * | |
714c48f1 | 6 | * Copyright (C) 1999-2009 Silicon Graphics, Inc. All rights reserved. |
a2d974da DN |
7 | */ |
8 | ||
a2d974da DN |
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 | ||
5a0e3ad6 | 23 | #include <linux/slab.h> |
a2d974da | 24 | #include <linux/module.h> |
a2d974da DN |
25 | #include <linux/netdevice.h> |
26 | #include <linux/etherdevice.h> | |
45d9ca49 | 27 | #include "xp.h" |
a2d974da | 28 | |
a2d974da DN |
29 | /* |
30 | * The message payload transferred by XPC. | |
31 | * | |
32 | * buf_pa is the physical address where the DMA should pull from. | |
33 | * | |
34 | * NOTE: for performance reasons, buf_pa should _ALWAYS_ begin on a | |
35 | * cacheline boundary. To accomplish this, we record the number of | |
36 | * bytes from the beginning of the first cacheline to the first useful | |
37 | * byte of the skb (leadin_ignore) and the number of bytes from the | |
38 | * last useful byte of the skb to the end of the last cacheline | |
39 | * (tailout_ignore). | |
40 | * | |
41 | * size is the number of bytes to transfer which includes the skb->len | |
42 | * (useful bytes of the senders skb) plus the leadin and tailout | |
43 | */ | |
44 | struct xpnet_message { | |
45 | u16 version; /* Version for this message */ | |
46 | u16 embedded_bytes; /* #of bytes embedded in XPC message */ | |
47 | u32 magic; /* Special number indicating this is xpnet */ | |
a812dcc3 | 48 | unsigned long buf_pa; /* phys address of buffer to retrieve */ |
a2d974da DN |
49 | u32 size; /* #of bytes in buffer */ |
50 | u8 leadin_ignore; /* #of bytes to ignore at the beginning */ | |
51 | u8 tailout_ignore; /* #of bytes to ignore at the end */ | |
52 | unsigned char data; /* body of small packets */ | |
53 | }; | |
54 | ||
55 | /* | |
56 | * Determine the size of our message, the cacheline aligned size, | |
57 | * and then the number of message will request from XPC. | |
58 | * | |
59 | * XPC expects each message to exist in an individual cacheline. | |
60 | */ | |
bd3e64c1 | 61 | #define XPNET_MSG_SIZE XPC_MSG_PAYLOAD_MAX_SIZE |
a2d974da | 62 | #define XPNET_MSG_DATA_MAX \ |
bd3e64c1 DN |
63 | (XPNET_MSG_SIZE - offsetof(struct xpnet_message, data)) |
64 | #define XPNET_MSG_NENTRIES (PAGE_SIZE / XPC_MSG_MAX_SIZE) | |
a2d974da | 65 | |
a2d974da DN |
66 | #define XPNET_MAX_KTHREADS (XPNET_MSG_NENTRIES + 1) |
67 | #define XPNET_MAX_IDLE_KTHREADS (XPNET_MSG_NENTRIES + 1) | |
68 | ||
69 | /* | |
70 | * Version number of XPNET implementation. XPNET can always talk to versions | |
71 | * with same major #, and never talk to versions with a different version. | |
72 | */ | |
73 | #define _XPNET_VERSION(_major, _minor) (((_major) << 4) | (_minor)) | |
74 | #define XPNET_VERSION_MAJOR(_v) ((_v) >> 4) | |
75 | #define XPNET_VERSION_MINOR(_v) ((_v) & 0xf) | |
76 | ||
2c2b94f9 DN |
77 | #define XPNET_VERSION _XPNET_VERSION(1, 0) /* version 1.0 */ |
78 | #define XPNET_VERSION_EMBED _XPNET_VERSION(1, 1) /* version 1.1 */ | |
35190506 | 79 | #define XPNET_MAGIC 0x88786984 /* "XNET" */ |
a2d974da DN |
80 | |
81 | #define XPNET_VALID_MSG(_m) \ | |
82 | ((XPNET_VERSION_MAJOR(_m->version) == XPNET_VERSION_MAJOR(XPNET_VERSION)) \ | |
83 | && (msg->magic == XPNET_MAGIC)) | |
84 | ||
85 | #define XPNET_DEVICE_NAME "xp0" | |
86 | ||
a2d974da DN |
87 | /* |
88 | * When messages are queued with xpc_send_notify, a kmalloc'd buffer | |
89 | * of the following type is passed as a notification cookie. When the | |
90 | * notification function is called, we use the cookie to decide | |
91 | * whether all outstanding message sends have completed. The skb can | |
92 | * then be released. | |
93 | */ | |
94 | struct xpnet_pending_msg { | |
a2d974da DN |
95 | struct sk_buff *skb; |
96 | atomic_t use_count; | |
97 | }; | |
98 | ||
a2d974da DN |
99 | struct net_device *xpnet_device; |
100 | ||
101 | /* | |
102 | * When we are notified of other partitions activating, we add them to | |
103 | * our bitmask of partitions to which we broadcast. | |
104 | */ | |
a7b4d509 | 105 | static unsigned long *xpnet_broadcast_partitions; |
a2d974da | 106 | /* protect above */ |
a9f6a0dd | 107 | static DEFINE_SPINLOCK(xpnet_broadcast_lock); |
a2d974da DN |
108 | |
109 | /* | |
110 | * Since the Block Transfer Engine (BTE) is being used for the transfer | |
111 | * and it relies upon cache-line size transfers, we need to reserve at | |
112 | * least one cache-line for head and tail alignment. The BTE is | |
113 | * limited to 8MB transfers. | |
114 | * | |
115 | * Testing has shown that changing MTU to greater than 64KB has no effect | |
116 | * on TCP as the two sides negotiate a Max Segment Size that is limited | |
117 | * to 64K. Other protocols May use packets greater than this, but for | |
118 | * now, the default is 64KB. | |
119 | */ | |
120 | #define XPNET_MAX_MTU (0x800000UL - L1_CACHE_BYTES) | |
b3e3893e JW |
121 | /* 68 comes from min TCP+IP+MAC header */ |
122 | #define XPNET_MIN_MTU 68 | |
a2d974da DN |
123 | /* 32KB has been determined to be the ideal */ |
124 | #define XPNET_DEF_MTU (0x8000UL) | |
125 | ||
a2d974da | 126 | /* |
a7b4d509 DN |
127 | * The partid is encapsulated in the MAC address beginning in the following |
128 | * octet and it consists of two octets. | |
a2d974da | 129 | */ |
a7b4d509 DN |
130 | #define XPNET_PARTID_OCTET 2 |
131 | ||
132 | /* Define the XPNET debug device structures to be used with dev_dbg() et al */ | |
a2d974da | 133 | |
a2d974da DN |
134 | struct device_driver xpnet_dbg_name = { |
135 | .name = "xpnet" | |
136 | }; | |
137 | ||
138 | struct device xpnet_dbg_subname = { | |
bb0dc43e | 139 | .init_name = "", /* set to "" */ |
a2d974da DN |
140 | .driver = &xpnet_dbg_name |
141 | }; | |
142 | ||
143 | struct device *xpnet = &xpnet_dbg_subname; | |
144 | ||
145 | /* | |
146 | * Packet was recevied by XPC and forwarded to us. | |
147 | */ | |
148 | static void | |
64d032ba | 149 | xpnet_receive(short partid, int channel, struct xpnet_message *msg) |
a2d974da DN |
150 | { |
151 | struct sk_buff *skb; | |
a812dcc3 | 152 | void *dst; |
908787db | 153 | enum xp_retval ret; |
a2d974da DN |
154 | |
155 | if (!XPNET_VALID_MSG(msg)) { | |
156 | /* | |
157 | * Packet with a different XPC version. Ignore. | |
158 | */ | |
35190506 | 159 | xpc_received(partid, channel, (void *)msg); |
a2d974da | 160 | |
e8ac9c55 | 161 | xpnet_device->stats.rx_errors++; |
a2d974da DN |
162 | |
163 | return; | |
164 | } | |
a812dcc3 DN |
165 | dev_dbg(xpnet, "received 0x%lx, %d, %d, %d\n", msg->buf_pa, msg->size, |
166 | msg->leadin_ignore, msg->tailout_ignore); | |
a2d974da | 167 | |
a2d974da DN |
168 | /* reserve an extra cache line */ |
169 | skb = dev_alloc_skb(msg->size + L1_CACHE_BYTES); | |
170 | if (!skb) { | |
171 | dev_err(xpnet, "failed on dev_alloc_skb(%d)\n", | |
172 | msg->size + L1_CACHE_BYTES); | |
173 | ||
35190506 | 174 | xpc_received(partid, channel, (void *)msg); |
a2d974da | 175 | |
e8ac9c55 | 176 | xpnet_device->stats.rx_errors++; |
a2d974da DN |
177 | |
178 | return; | |
179 | } | |
180 | ||
181 | /* | |
182 | * The allocated skb has some reserved space. | |
908787db | 183 | * In order to use xp_remote_memcpy(), we need to get the |
a2d974da DN |
184 | * skb->data pointer moved forward. |
185 | */ | |
186 | skb_reserve(skb, (L1_CACHE_BYTES - ((u64)skb->data & | |
187 | (L1_CACHE_BYTES - 1)) + | |
188 | msg->leadin_ignore)); | |
189 | ||
190 | /* | |
191 | * Update the tail pointer to indicate data actually | |
192 | * transferred. | |
193 | */ | |
194 | skb_put(skb, (msg->size - msg->leadin_ignore - msg->tailout_ignore)); | |
195 | ||
196 | /* | |
4b3f686d | 197 | * Move the data over from the other side. |
a2d974da DN |
198 | */ |
199 | if ((XPNET_VERSION_MINOR(msg->version) == 1) && | |
35190506 | 200 | (msg->embedded_bytes != 0)) { |
a2d974da DN |
201 | dev_dbg(xpnet, "copying embedded message. memcpy(0x%p, 0x%p, " |
202 | "%lu)\n", skb->data, &msg->data, | |
35190506 | 203 | (size_t)msg->embedded_bytes); |
a2d974da | 204 | |
35190506 DN |
205 | skb_copy_to_linear_data(skb, &msg->data, |
206 | (size_t)msg->embedded_bytes); | |
a2d974da | 207 | } else { |
a812dcc3 | 208 | dst = (void *)((u64)skb->data & ~(L1_CACHE_BYTES - 1)); |
a2d974da | 209 | dev_dbg(xpnet, "transferring buffer to the skb->data area;\n\t" |
a812dcc3 | 210 | "xp_remote_memcpy(0x%p, 0x%p, %hu)\n", dst, |
908787db | 211 | (void *)msg->buf_pa, msg->size); |
a2d974da | 212 | |
a812dcc3 | 213 | ret = xp_remote_memcpy(xp_pa(dst), msg->buf_pa, msg->size); |
908787db | 214 | if (ret != xpSuccess) { |
2c2b94f9 | 215 | /* |
ea57f80c DN |
216 | * !!! Need better way of cleaning skb. Currently skb |
217 | * !!! appears in_use and we can't just call | |
218 | * !!! dev_kfree_skb. | |
2c2b94f9 | 219 | */ |
908787db | 220 | dev_err(xpnet, "xp_remote_memcpy(0x%p, 0x%p, 0x%hx) " |
a812dcc3 | 221 | "returned error=0x%x\n", dst, |
908787db | 222 | (void *)msg->buf_pa, msg->size, ret); |
a2d974da | 223 | |
35190506 | 224 | xpc_received(partid, channel, (void *)msg); |
a2d974da | 225 | |
e8ac9c55 | 226 | xpnet_device->stats.rx_errors++; |
a2d974da DN |
227 | |
228 | return; | |
229 | } | |
230 | } | |
231 | ||
232 | dev_dbg(xpnet, "<skb->head=0x%p skb->data=0x%p skb->tail=0x%p " | |
35190506 | 233 | "skb->end=0x%p skb->len=%d\n", (void *)skb->head, |
4305b541 | 234 | (void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb), |
a2d974da DN |
235 | skb->len); |
236 | ||
a2d974da DN |
237 | skb->protocol = eth_type_trans(skb, xpnet_device); |
238 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
239 | ||
898eb71c | 240 | dev_dbg(xpnet, "passing skb to network layer\n" |
ad361c98 | 241 | "\tskb->head=0x%p skb->data=0x%p skb->tail=0x%p " |
898eb71c | 242 | "skb->end=0x%p skb->len=%d\n", |
27a884dc | 243 | (void *)skb->head, (void *)skb->data, skb_tail_pointer(skb), |
4305b541 | 244 | skb_end_pointer(skb), skb->len); |
a2d974da | 245 | |
e8ac9c55 SH |
246 | xpnet_device->stats.rx_packets++; |
247 | xpnet_device->stats.rx_bytes += skb->len + ETH_HLEN; | |
a2d974da DN |
248 | |
249 | netif_rx_ni(skb); | |
35190506 | 250 | xpc_received(partid, channel, (void *)msg); |
a2d974da DN |
251 | } |
252 | ||
a2d974da DN |
253 | /* |
254 | * This is the handler which XPC calls during any sort of change in | |
255 | * state or message reception on a connection. | |
256 | */ | |
257 | static void | |
64d032ba | 258 | xpnet_connection_activity(enum xp_retval reason, short partid, int channel, |
a2d974da DN |
259 | void *data, void *key) |
260 | { | |
bc63d387 | 261 | DBUG_ON(partid < 0 || partid >= xp_max_npartitions); |
a2d974da DN |
262 | DBUG_ON(channel != XPC_NET_CHANNEL); |
263 | ||
35190506 | 264 | switch (reason) { |
65c17b80 | 265 | case xpMsgReceived: /* message received */ |
a2d974da DN |
266 | DBUG_ON(data == NULL); |
267 | ||
35190506 | 268 | xpnet_receive(partid, channel, (struct xpnet_message *)data); |
a2d974da DN |
269 | break; |
270 | ||
65c17b80 | 271 | case xpConnected: /* connection completed to a partition */ |
a2d974da | 272 | spin_lock_bh(&xpnet_broadcast_lock); |
a7b4d509 | 273 | __set_bit(partid, xpnet_broadcast_partitions); |
a2d974da DN |
274 | spin_unlock_bh(&xpnet_broadcast_lock); |
275 | ||
276 | netif_carrier_on(xpnet_device); | |
277 | ||
a7b4d509 DN |
278 | dev_dbg(xpnet, "%s connected to partition %d\n", |
279 | xpnet_device->name, partid); | |
a2d974da DN |
280 | break; |
281 | ||
282 | default: | |
283 | spin_lock_bh(&xpnet_broadcast_lock); | |
a7b4d509 | 284 | __clear_bit(partid, xpnet_broadcast_partitions); |
a2d974da DN |
285 | spin_unlock_bh(&xpnet_broadcast_lock); |
286 | ||
a7b4d509 DN |
287 | if (bitmap_empty((unsigned long *)xpnet_broadcast_partitions, |
288 | xp_max_npartitions)) { | |
a2d974da | 289 | netif_carrier_off(xpnet_device); |
a7b4d509 | 290 | } |
a2d974da | 291 | |
a7b4d509 DN |
292 | dev_dbg(xpnet, "%s disconnected from partition %d\n", |
293 | xpnet_device->name, partid); | |
a2d974da | 294 | break; |
a2d974da DN |
295 | } |
296 | } | |
297 | ||
a2d974da DN |
298 | static int |
299 | xpnet_dev_open(struct net_device *dev) | |
300 | { | |
65c17b80 | 301 | enum xp_retval ret; |
a2d974da | 302 | |
b9ae3bd2 TL |
303 | dev_dbg(xpnet, "calling xpc_connect(%d, 0x%p, NULL, %ld, %ld, %ld, " |
304 | "%ld)\n", XPC_NET_CHANNEL, xpnet_connection_activity, | |
261f3b49 DN |
305 | (unsigned long)XPNET_MSG_SIZE, |
306 | (unsigned long)XPNET_MSG_NENTRIES, | |
307 | (unsigned long)XPNET_MAX_KTHREADS, | |
308 | (unsigned long)XPNET_MAX_IDLE_KTHREADS); | |
a2d974da DN |
309 | |
310 | ret = xpc_connect(XPC_NET_CHANNEL, xpnet_connection_activity, NULL, | |
311 | XPNET_MSG_SIZE, XPNET_MSG_NENTRIES, | |
312 | XPNET_MAX_KTHREADS, XPNET_MAX_IDLE_KTHREADS); | |
65c17b80 | 313 | if (ret != xpSuccess) { |
a2d974da DN |
314 | dev_err(xpnet, "ifconfig up of %s failed on XPC connect, " |
315 | "ret=%d\n", dev->name, ret); | |
316 | ||
317 | return -ENOMEM; | |
318 | } | |
319 | ||
320 | dev_dbg(xpnet, "ifconfig up of %s; XPC connected\n", dev->name); | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
a2d974da DN |
325 | static int |
326 | xpnet_dev_stop(struct net_device *dev) | |
327 | { | |
328 | xpc_disconnect(XPC_NET_CHANNEL); | |
329 | ||
330 | dev_dbg(xpnet, "ifconfig down of %s; XPC disconnected\n", dev->name); | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
a2d974da DN |
335 | /* |
336 | * Notification that the other end has received the message and | |
337 | * DMA'd the skb information. At this point, they are done with | |
338 | * our side. When all recipients are done processing, we | |
339 | * release the skb and then release our pending message structure. | |
340 | */ | |
341 | static void | |
64d032ba | 342 | xpnet_send_completed(enum xp_retval reason, short partid, int channel, |
35190506 | 343 | void *__qm) |
a2d974da | 344 | { |
35190506 | 345 | struct xpnet_pending_msg *queued_msg = (struct xpnet_pending_msg *)__qm; |
a2d974da DN |
346 | |
347 | DBUG_ON(queued_msg == NULL); | |
348 | ||
349 | dev_dbg(xpnet, "message to %d notified with reason %d\n", | |
350 | partid, reason); | |
351 | ||
352 | if (atomic_dec_return(&queued_msg->use_count) == 0) { | |
353 | dev_dbg(xpnet, "all acks for skb->head=-x%p\n", | |
35190506 | 354 | (void *)queued_msg->skb->head); |
a2d974da DN |
355 | |
356 | dev_kfree_skb_any(queued_msg->skb); | |
357 | kfree(queued_msg); | |
358 | } | |
359 | } | |
360 | ||
a7b4d509 DN |
361 | static void |
362 | xpnet_send(struct sk_buff *skb, struct xpnet_pending_msg *queued_msg, | |
363 | u64 start_addr, u64 end_addr, u16 embedded_bytes, int dest_partid) | |
364 | { | |
365 | u8 msg_buffer[XPNET_MSG_SIZE]; | |
366 | struct xpnet_message *msg = (struct xpnet_message *)&msg_buffer; | |
bd3e64c1 | 367 | u16 msg_size = sizeof(struct xpnet_message); |
a7b4d509 DN |
368 | enum xp_retval ret; |
369 | ||
370 | msg->embedded_bytes = embedded_bytes; | |
371 | if (unlikely(embedded_bytes != 0)) { | |
372 | msg->version = XPNET_VERSION_EMBED; | |
373 | dev_dbg(xpnet, "calling memcpy(0x%p, 0x%p, 0x%lx)\n", | |
374 | &msg->data, skb->data, (size_t)embedded_bytes); | |
375 | skb_copy_from_linear_data(skb, &msg->data, | |
376 | (size_t)embedded_bytes); | |
bd3e64c1 | 377 | msg_size += embedded_bytes - 1; |
a7b4d509 DN |
378 | } else { |
379 | msg->version = XPNET_VERSION; | |
380 | } | |
381 | msg->magic = XPNET_MAGIC; | |
382 | msg->size = end_addr - start_addr; | |
383 | msg->leadin_ignore = (u64)skb->data - start_addr; | |
384 | msg->tailout_ignore = end_addr - (u64)skb_tail_pointer(skb); | |
a812dcc3 | 385 | msg->buf_pa = xp_pa((void *)start_addr); |
a7b4d509 DN |
386 | |
387 | dev_dbg(xpnet, "sending XPC message to %d:%d\n" | |
ad361c98 | 388 | "msg->buf_pa=0x%lx, msg->size=%u, " |
a7b4d509 | 389 | "msg->leadin_ignore=%u, msg->tailout_ignore=%u\n", |
a812dcc3 DN |
390 | dest_partid, XPC_NET_CHANNEL, msg->buf_pa, msg->size, |
391 | msg->leadin_ignore, msg->tailout_ignore); | |
a7b4d509 DN |
392 | |
393 | atomic_inc(&queued_msg->use_count); | |
394 | ||
395 | ret = xpc_send_notify(dest_partid, XPC_NET_CHANNEL, XPC_NOWAIT, msg, | |
bd3e64c1 | 396 | msg_size, xpnet_send_completed, queued_msg); |
a7b4d509 DN |
397 | if (unlikely(ret != xpSuccess)) |
398 | atomic_dec(&queued_msg->use_count); | |
399 | } | |
400 | ||
a2d974da DN |
401 | /* |
402 | * Network layer has formatted a packet (skb) and is ready to place it | |
403 | * "on the wire". Prepare and send an xpnet_message to all partitions | |
404 | * which have connected with us and are targets of this packet. | |
405 | * | |
406 | * MAC-NOTE: For the XPNET driver, the MAC address contains the | |
a7b4d509 DN |
407 | * destination partid. If the destination partid octets are 0xffff, |
408 | * this packet is to be broadcast to all connected partitions. | |
a2d974da DN |
409 | */ |
410 | static int | |
411 | xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
412 | { | |
413 | struct xpnet_pending_msg *queued_msg; | |
a2d974da | 414 | u64 start_addr, end_addr; |
64d032ba | 415 | short dest_partid; |
a7b4d509 | 416 | u16 embedded_bytes = 0; |
a2d974da DN |
417 | |
418 | dev_dbg(xpnet, ">skb->head=0x%p skb->data=0x%p skb->tail=0x%p " | |
35190506 | 419 | "skb->end=0x%p skb->len=%d\n", (void *)skb->head, |
4305b541 | 420 | (void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb), |
a2d974da DN |
421 | skb->len); |
422 | ||
a7b4d509 DN |
423 | if (skb->data[0] == 0x33) { |
424 | dev_kfree_skb(skb); | |
6ed10654 | 425 | return NETDEV_TX_OK; /* nothing needed to be done */ |
a7b4d509 DN |
426 | } |
427 | ||
a2d974da DN |
428 | /* |
429 | * The xpnet_pending_msg tracks how many outstanding | |
430 | * xpc_send_notifies are relying on this skb. When none | |
431 | * remain, release the skb. | |
432 | */ | |
433 | queued_msg = kmalloc(sizeof(struct xpnet_pending_msg), GFP_ATOMIC); | |
434 | if (queued_msg == NULL) { | |
435 | dev_warn(xpnet, "failed to kmalloc %ld bytes; dropping " | |
35190506 | 436 | "packet\n", sizeof(struct xpnet_pending_msg)); |
a2d974da | 437 | |
e8ac9c55 | 438 | dev->stats.tx_errors++; |
3790c8cd PM |
439 | dev_kfree_skb(skb); |
440 | return NETDEV_TX_OK; | |
a2d974da DN |
441 | } |
442 | ||
a2d974da | 443 | /* get the beginning of the first cacheline and end of last */ |
35190506 | 444 | start_addr = ((u64)skb->data & ~(L1_CACHE_BYTES - 1)); |
27a884dc | 445 | end_addr = L1_CACHE_ALIGN((u64)skb_tail_pointer(skb)); |
a2d974da DN |
446 | |
447 | /* calculate how many bytes to embed in the XPC message */ | |
a2d974da DN |
448 | if (unlikely(skb->len <= XPNET_MSG_DATA_MAX)) { |
449 | /* skb->data does fit so embed */ | |
450 | embedded_bytes = skb->len; | |
451 | } | |
452 | ||
a2d974da DN |
453 | /* |
454 | * Since the send occurs asynchronously, we set the count to one | |
455 | * and begin sending. Any sends that happen to complete before | |
456 | * we are done sending will not free the skb. We will be left | |
457 | * with that task during exit. This also handles the case of | |
458 | * a packet destined for a partition which is no longer up. | |
459 | */ | |
460 | atomic_set(&queued_msg->use_count, 1); | |
461 | queued_msg->skb = skb; | |
462 | ||
a7b4d509 | 463 | if (skb->data[0] == 0xff) { |
a2d974da | 464 | /* we are being asked to broadcast to all partitions */ |
984b3f57 | 465 | for_each_set_bit(dest_partid, xpnet_broadcast_partitions, |
a7b4d509 | 466 | xp_max_npartitions) { |
a2d974da | 467 | |
a7b4d509 DN |
468 | xpnet_send(skb, queued_msg, start_addr, end_addr, |
469 | embedded_bytes, dest_partid); | |
a2d974da | 470 | } |
a7b4d509 DN |
471 | } else { |
472 | dest_partid = (short)skb->data[XPNET_PARTID_OCTET + 1]; | |
473 | dest_partid |= (short)skb->data[XPNET_PARTID_OCTET + 0] << 8; | |
a2d974da | 474 | |
a7b4d509 DN |
475 | if (dest_partid >= 0 && |
476 | dest_partid < xp_max_npartitions && | |
477 | test_bit(dest_partid, xpnet_broadcast_partitions) != 0) { | |
a2d974da | 478 | |
a7b4d509 DN |
479 | xpnet_send(skb, queued_msg, start_addr, end_addr, |
480 | embedded_bytes, dest_partid); | |
a2d974da | 481 | } |
a2d974da DN |
482 | } |
483 | ||
44da29d2 ED |
484 | dev->stats.tx_packets++; |
485 | dev->stats.tx_bytes += skb->len; | |
486 | ||
a2d974da | 487 | if (atomic_dec_return(&queued_msg->use_count) == 0) { |
a2d974da DN |
488 | dev_kfree_skb(skb); |
489 | kfree(queued_msg); | |
490 | } | |
491 | ||
6ed10654 | 492 | return NETDEV_TX_OK; |
a2d974da DN |
493 | } |
494 | ||
a2d974da DN |
495 | /* |
496 | * Deal with transmit timeouts coming from the network layer. | |
497 | */ | |
498 | static void | |
35190506 | 499 | xpnet_dev_tx_timeout(struct net_device *dev) |
a2d974da | 500 | { |
e8ac9c55 | 501 | dev->stats.tx_errors++; |
a2d974da DN |
502 | } |
503 | ||
e8ac9c55 SH |
504 | static const struct net_device_ops xpnet_netdev_ops = { |
505 | .ndo_open = xpnet_dev_open, | |
506 | .ndo_stop = xpnet_dev_stop, | |
507 | .ndo_start_xmit = xpnet_dev_hard_start_xmit, | |
e8ac9c55 SH |
508 | .ndo_tx_timeout = xpnet_dev_tx_timeout, |
509 | .ndo_set_mac_address = eth_mac_addr, | |
510 | .ndo_validate_addr = eth_validate_addr, | |
511 | }; | |
512 | ||
a2d974da DN |
513 | static int __init |
514 | xpnet_init(void) | |
515 | { | |
a7b4d509 | 516 | int result; |
a2d974da | 517 | |
a7b4d509 | 518 | if (!is_shub() && !is_uv()) |
408865ce | 519 | return -ENODEV; |
408865ce | 520 | |
a2d974da DN |
521 | dev_info(xpnet, "registering network device %s\n", XPNET_DEVICE_NAME); |
522 | ||
a7b4d509 DN |
523 | xpnet_broadcast_partitions = kzalloc(BITS_TO_LONGS(xp_max_npartitions) * |
524 | sizeof(long), GFP_KERNEL); | |
525 | if (xpnet_broadcast_partitions == NULL) | |
526 | return -ENOMEM; | |
527 | ||
a2d974da DN |
528 | /* |
529 | * use ether_setup() to init the majority of our device | |
530 | * structure and then override the necessary pieces. | |
531 | */ | |
c835a677 TG |
532 | xpnet_device = alloc_netdev(0, XPNET_DEVICE_NAME, NET_NAME_UNKNOWN, |
533 | ether_setup); | |
a7b4d509 DN |
534 | if (xpnet_device == NULL) { |
535 | kfree(xpnet_broadcast_partitions); | |
a2d974da | 536 | return -ENOMEM; |
a7b4d509 | 537 | } |
a2d974da DN |
538 | |
539 | netif_carrier_off(xpnet_device); | |
540 | ||
714c48f1 | 541 | xpnet_device->netdev_ops = &xpnet_netdev_ops; |
a2d974da | 542 | xpnet_device->mtu = XPNET_DEF_MTU; |
b3e3893e JW |
543 | xpnet_device->min_mtu = XPNET_MIN_MTU; |
544 | xpnet_device->max_mtu = XPNET_MAX_MTU; | |
a2d974da DN |
545 | |
546 | /* | |
547 | * Multicast assumes the LSB of the first octet is set for multicast | |
548 | * MAC addresses. We chose the first octet of the MAC to be unlikely | |
549 | * to collide with any vendor's officially issued MAC. | |
550 | */ | |
a7b4d509 DN |
551 | xpnet_device->dev_addr[0] = 0x02; /* locally administered, no OUI */ |
552 | ||
261f3b49 DN |
553 | xpnet_device->dev_addr[XPNET_PARTID_OCTET + 1] = xp_partition_id; |
554 | xpnet_device->dev_addr[XPNET_PARTID_OCTET + 0] = (xp_partition_id >> 8); | |
a2d974da DN |
555 | |
556 | /* | |
557 | * ether_setup() sets this to a multicast device. We are | |
558 | * really not supporting multicast at this time. | |
559 | */ | |
560 | xpnet_device->flags &= ~IFF_MULTICAST; | |
561 | ||
562 | /* | |
563 | * No need to checksum as it is a DMA transfer. The BTE will | |
564 | * report an error if the data is not retrievable and the | |
565 | * packet will be dropped. | |
566 | */ | |
34324dc2 | 567 | xpnet_device->features = NETIF_F_HW_CSUM; |
a2d974da DN |
568 | |
569 | result = register_netdev(xpnet_device); | |
a7b4d509 | 570 | if (result != 0) { |
a2d974da | 571 | free_netdev(xpnet_device); |
a7b4d509 DN |
572 | kfree(xpnet_broadcast_partitions); |
573 | } | |
a2d974da DN |
574 | |
575 | return result; | |
576 | } | |
a2d974da | 577 | |
35190506 | 578 | module_init(xpnet_init); |
a2d974da DN |
579 | |
580 | static void __exit | |
581 | xpnet_exit(void) | |
582 | { | |
583 | dev_info(xpnet, "unregistering network device %s\n", | |
35190506 | 584 | xpnet_device[0].name); |
a2d974da DN |
585 | |
586 | unregister_netdev(xpnet_device); | |
a2d974da | 587 | free_netdev(xpnet_device); |
a7b4d509 | 588 | kfree(xpnet_broadcast_partitions); |
a2d974da | 589 | } |
a2d974da | 590 | |
35190506 | 591 | module_exit(xpnet_exit); |
a2d974da DN |
592 | |
593 | MODULE_AUTHOR("Silicon Graphics, Inc."); | |
594 | MODULE_DESCRIPTION("Cross Partition Network adapter (XPNET)"); | |
595 | MODULE_LICENSE("GPL"); |