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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) | |
121 | /* 32KB has been determined to be the ideal */ | |
122 | #define XPNET_DEF_MTU (0x8000UL) | |
123 | ||
a2d974da | 124 | /* |
a7b4d509 DN |
125 | * The partid is encapsulated in the MAC address beginning in the following |
126 | * octet and it consists of two octets. | |
a2d974da | 127 | */ |
a7b4d509 DN |
128 | #define XPNET_PARTID_OCTET 2 |
129 | ||
130 | /* Define the XPNET debug device structures to be used with dev_dbg() et al */ | |
a2d974da | 131 | |
a2d974da DN |
132 | struct device_driver xpnet_dbg_name = { |
133 | .name = "xpnet" | |
134 | }; | |
135 | ||
136 | struct device xpnet_dbg_subname = { | |
bb0dc43e | 137 | .init_name = "", /* set to "" */ |
a2d974da DN |
138 | .driver = &xpnet_dbg_name |
139 | }; | |
140 | ||
141 | struct device *xpnet = &xpnet_dbg_subname; | |
142 | ||
143 | /* | |
144 | * Packet was recevied by XPC and forwarded to us. | |
145 | */ | |
146 | static void | |
64d032ba | 147 | xpnet_receive(short partid, int channel, struct xpnet_message *msg) |
a2d974da DN |
148 | { |
149 | struct sk_buff *skb; | |
a812dcc3 | 150 | void *dst; |
908787db | 151 | enum xp_retval ret; |
a2d974da DN |
152 | |
153 | if (!XPNET_VALID_MSG(msg)) { | |
154 | /* | |
155 | * Packet with a different XPC version. Ignore. | |
156 | */ | |
35190506 | 157 | xpc_received(partid, channel, (void *)msg); |
a2d974da | 158 | |
e8ac9c55 | 159 | xpnet_device->stats.rx_errors++; |
a2d974da DN |
160 | |
161 | return; | |
162 | } | |
a812dcc3 DN |
163 | dev_dbg(xpnet, "received 0x%lx, %d, %d, %d\n", msg->buf_pa, msg->size, |
164 | msg->leadin_ignore, msg->tailout_ignore); | |
a2d974da | 165 | |
a2d974da DN |
166 | /* reserve an extra cache line */ |
167 | skb = dev_alloc_skb(msg->size + L1_CACHE_BYTES); | |
168 | if (!skb) { | |
169 | dev_err(xpnet, "failed on dev_alloc_skb(%d)\n", | |
170 | msg->size + L1_CACHE_BYTES); | |
171 | ||
35190506 | 172 | xpc_received(partid, channel, (void *)msg); |
a2d974da | 173 | |
e8ac9c55 | 174 | xpnet_device->stats.rx_errors++; |
a2d974da DN |
175 | |
176 | return; | |
177 | } | |
178 | ||
179 | /* | |
180 | * The allocated skb has some reserved space. | |
908787db | 181 | * In order to use xp_remote_memcpy(), we need to get the |
a2d974da DN |
182 | * skb->data pointer moved forward. |
183 | */ | |
184 | skb_reserve(skb, (L1_CACHE_BYTES - ((u64)skb->data & | |
185 | (L1_CACHE_BYTES - 1)) + | |
186 | msg->leadin_ignore)); | |
187 | ||
188 | /* | |
189 | * Update the tail pointer to indicate data actually | |
190 | * transferred. | |
191 | */ | |
192 | skb_put(skb, (msg->size - msg->leadin_ignore - msg->tailout_ignore)); | |
193 | ||
194 | /* | |
4b3f686d | 195 | * Move the data over from the other side. |
a2d974da DN |
196 | */ |
197 | if ((XPNET_VERSION_MINOR(msg->version) == 1) && | |
35190506 | 198 | (msg->embedded_bytes != 0)) { |
a2d974da DN |
199 | dev_dbg(xpnet, "copying embedded message. memcpy(0x%p, 0x%p, " |
200 | "%lu)\n", skb->data, &msg->data, | |
35190506 | 201 | (size_t)msg->embedded_bytes); |
a2d974da | 202 | |
35190506 DN |
203 | skb_copy_to_linear_data(skb, &msg->data, |
204 | (size_t)msg->embedded_bytes); | |
a2d974da | 205 | } else { |
a812dcc3 | 206 | dst = (void *)((u64)skb->data & ~(L1_CACHE_BYTES - 1)); |
a2d974da | 207 | dev_dbg(xpnet, "transferring buffer to the skb->data area;\n\t" |
a812dcc3 | 208 | "xp_remote_memcpy(0x%p, 0x%p, %hu)\n", dst, |
908787db | 209 | (void *)msg->buf_pa, msg->size); |
a2d974da | 210 | |
a812dcc3 | 211 | ret = xp_remote_memcpy(xp_pa(dst), msg->buf_pa, msg->size); |
908787db | 212 | if (ret != xpSuccess) { |
2c2b94f9 | 213 | /* |
ea57f80c DN |
214 | * !!! Need better way of cleaning skb. Currently skb |
215 | * !!! appears in_use and we can't just call | |
216 | * !!! dev_kfree_skb. | |
2c2b94f9 | 217 | */ |
908787db | 218 | dev_err(xpnet, "xp_remote_memcpy(0x%p, 0x%p, 0x%hx) " |
a812dcc3 | 219 | "returned error=0x%x\n", dst, |
908787db | 220 | (void *)msg->buf_pa, msg->size, ret); |
a2d974da | 221 | |
35190506 | 222 | xpc_received(partid, channel, (void *)msg); |
a2d974da | 223 | |
e8ac9c55 | 224 | xpnet_device->stats.rx_errors++; |
a2d974da DN |
225 | |
226 | return; | |
227 | } | |
228 | } | |
229 | ||
230 | dev_dbg(xpnet, "<skb->head=0x%p skb->data=0x%p skb->tail=0x%p " | |
35190506 | 231 | "skb->end=0x%p skb->len=%d\n", (void *)skb->head, |
4305b541 | 232 | (void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb), |
a2d974da DN |
233 | skb->len); |
234 | ||
a2d974da DN |
235 | skb->protocol = eth_type_trans(skb, xpnet_device); |
236 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
237 | ||
898eb71c | 238 | dev_dbg(xpnet, "passing skb to network layer\n" |
ad361c98 | 239 | "\tskb->head=0x%p skb->data=0x%p skb->tail=0x%p " |
898eb71c | 240 | "skb->end=0x%p skb->len=%d\n", |
27a884dc | 241 | (void *)skb->head, (void *)skb->data, skb_tail_pointer(skb), |
4305b541 | 242 | skb_end_pointer(skb), skb->len); |
a2d974da | 243 | |
e8ac9c55 SH |
244 | xpnet_device->stats.rx_packets++; |
245 | xpnet_device->stats.rx_bytes += skb->len + ETH_HLEN; | |
a2d974da DN |
246 | |
247 | netif_rx_ni(skb); | |
35190506 | 248 | xpc_received(partid, channel, (void *)msg); |
a2d974da DN |
249 | } |
250 | ||
a2d974da DN |
251 | /* |
252 | * This is the handler which XPC calls during any sort of change in | |
253 | * state or message reception on a connection. | |
254 | */ | |
255 | static void | |
64d032ba | 256 | xpnet_connection_activity(enum xp_retval reason, short partid, int channel, |
a2d974da DN |
257 | void *data, void *key) |
258 | { | |
bc63d387 | 259 | DBUG_ON(partid < 0 || partid >= xp_max_npartitions); |
a2d974da DN |
260 | DBUG_ON(channel != XPC_NET_CHANNEL); |
261 | ||
35190506 | 262 | switch (reason) { |
65c17b80 | 263 | case xpMsgReceived: /* message received */ |
a2d974da DN |
264 | DBUG_ON(data == NULL); |
265 | ||
35190506 | 266 | xpnet_receive(partid, channel, (struct xpnet_message *)data); |
a2d974da DN |
267 | break; |
268 | ||
65c17b80 | 269 | case xpConnected: /* connection completed to a partition */ |
a2d974da | 270 | spin_lock_bh(&xpnet_broadcast_lock); |
a7b4d509 | 271 | __set_bit(partid, xpnet_broadcast_partitions); |
a2d974da DN |
272 | spin_unlock_bh(&xpnet_broadcast_lock); |
273 | ||
274 | netif_carrier_on(xpnet_device); | |
275 | ||
a7b4d509 DN |
276 | dev_dbg(xpnet, "%s connected to partition %d\n", |
277 | xpnet_device->name, partid); | |
a2d974da DN |
278 | break; |
279 | ||
280 | default: | |
281 | spin_lock_bh(&xpnet_broadcast_lock); | |
a7b4d509 | 282 | __clear_bit(partid, xpnet_broadcast_partitions); |
a2d974da DN |
283 | spin_unlock_bh(&xpnet_broadcast_lock); |
284 | ||
a7b4d509 DN |
285 | if (bitmap_empty((unsigned long *)xpnet_broadcast_partitions, |
286 | xp_max_npartitions)) { | |
a2d974da | 287 | netif_carrier_off(xpnet_device); |
a7b4d509 | 288 | } |
a2d974da | 289 | |
a7b4d509 DN |
290 | dev_dbg(xpnet, "%s disconnected from partition %d\n", |
291 | xpnet_device->name, partid); | |
a2d974da | 292 | break; |
a2d974da DN |
293 | } |
294 | } | |
295 | ||
a2d974da DN |
296 | static int |
297 | xpnet_dev_open(struct net_device *dev) | |
298 | { | |
65c17b80 | 299 | enum xp_retval ret; |
a2d974da | 300 | |
b9ae3bd2 TL |
301 | dev_dbg(xpnet, "calling xpc_connect(%d, 0x%p, NULL, %ld, %ld, %ld, " |
302 | "%ld)\n", XPC_NET_CHANNEL, xpnet_connection_activity, | |
261f3b49 DN |
303 | (unsigned long)XPNET_MSG_SIZE, |
304 | (unsigned long)XPNET_MSG_NENTRIES, | |
305 | (unsigned long)XPNET_MAX_KTHREADS, | |
306 | (unsigned long)XPNET_MAX_IDLE_KTHREADS); | |
a2d974da DN |
307 | |
308 | ret = xpc_connect(XPC_NET_CHANNEL, xpnet_connection_activity, NULL, | |
309 | XPNET_MSG_SIZE, XPNET_MSG_NENTRIES, | |
310 | XPNET_MAX_KTHREADS, XPNET_MAX_IDLE_KTHREADS); | |
65c17b80 | 311 | if (ret != xpSuccess) { |
a2d974da DN |
312 | dev_err(xpnet, "ifconfig up of %s failed on XPC connect, " |
313 | "ret=%d\n", dev->name, ret); | |
314 | ||
315 | return -ENOMEM; | |
316 | } | |
317 | ||
318 | dev_dbg(xpnet, "ifconfig up of %s; XPC connected\n", dev->name); | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
a2d974da DN |
323 | static int |
324 | xpnet_dev_stop(struct net_device *dev) | |
325 | { | |
326 | xpc_disconnect(XPC_NET_CHANNEL); | |
327 | ||
328 | dev_dbg(xpnet, "ifconfig down of %s; XPC disconnected\n", dev->name); | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
a2d974da DN |
333 | static int |
334 | xpnet_dev_change_mtu(struct net_device *dev, int new_mtu) | |
335 | { | |
336 | /* 68 comes from min TCP+IP+MAC header */ | |
337 | if ((new_mtu < 68) || (new_mtu > XPNET_MAX_MTU)) { | |
338 | dev_err(xpnet, "ifconfig %s mtu %d failed; value must be " | |
339 | "between 68 and %ld\n", dev->name, new_mtu, | |
340 | XPNET_MAX_MTU); | |
341 | return -EINVAL; | |
342 | } | |
343 | ||
344 | dev->mtu = new_mtu; | |
345 | dev_dbg(xpnet, "ifconfig %s mtu set to %d\n", dev->name, new_mtu); | |
346 | return 0; | |
347 | } | |
348 | ||
a2d974da DN |
349 | /* |
350 | * Notification that the other end has received the message and | |
351 | * DMA'd the skb information. At this point, they are done with | |
352 | * our side. When all recipients are done processing, we | |
353 | * release the skb and then release our pending message structure. | |
354 | */ | |
355 | static void | |
64d032ba | 356 | xpnet_send_completed(enum xp_retval reason, short partid, int channel, |
35190506 | 357 | void *__qm) |
a2d974da | 358 | { |
35190506 | 359 | struct xpnet_pending_msg *queued_msg = (struct xpnet_pending_msg *)__qm; |
a2d974da DN |
360 | |
361 | DBUG_ON(queued_msg == NULL); | |
362 | ||
363 | dev_dbg(xpnet, "message to %d notified with reason %d\n", | |
364 | partid, reason); | |
365 | ||
366 | if (atomic_dec_return(&queued_msg->use_count) == 0) { | |
367 | dev_dbg(xpnet, "all acks for skb->head=-x%p\n", | |
35190506 | 368 | (void *)queued_msg->skb->head); |
a2d974da DN |
369 | |
370 | dev_kfree_skb_any(queued_msg->skb); | |
371 | kfree(queued_msg); | |
372 | } | |
373 | } | |
374 | ||
a7b4d509 DN |
375 | static void |
376 | xpnet_send(struct sk_buff *skb, struct xpnet_pending_msg *queued_msg, | |
377 | u64 start_addr, u64 end_addr, u16 embedded_bytes, int dest_partid) | |
378 | { | |
379 | u8 msg_buffer[XPNET_MSG_SIZE]; | |
380 | struct xpnet_message *msg = (struct xpnet_message *)&msg_buffer; | |
bd3e64c1 | 381 | u16 msg_size = sizeof(struct xpnet_message); |
a7b4d509 DN |
382 | enum xp_retval ret; |
383 | ||
384 | msg->embedded_bytes = embedded_bytes; | |
385 | if (unlikely(embedded_bytes != 0)) { | |
386 | msg->version = XPNET_VERSION_EMBED; | |
387 | dev_dbg(xpnet, "calling memcpy(0x%p, 0x%p, 0x%lx)\n", | |
388 | &msg->data, skb->data, (size_t)embedded_bytes); | |
389 | skb_copy_from_linear_data(skb, &msg->data, | |
390 | (size_t)embedded_bytes); | |
bd3e64c1 | 391 | msg_size += embedded_bytes - 1; |
a7b4d509 DN |
392 | } else { |
393 | msg->version = XPNET_VERSION; | |
394 | } | |
395 | msg->magic = XPNET_MAGIC; | |
396 | msg->size = end_addr - start_addr; | |
397 | msg->leadin_ignore = (u64)skb->data - start_addr; | |
398 | msg->tailout_ignore = end_addr - (u64)skb_tail_pointer(skb); | |
a812dcc3 | 399 | msg->buf_pa = xp_pa((void *)start_addr); |
a7b4d509 DN |
400 | |
401 | dev_dbg(xpnet, "sending XPC message to %d:%d\n" | |
ad361c98 | 402 | "msg->buf_pa=0x%lx, msg->size=%u, " |
a7b4d509 | 403 | "msg->leadin_ignore=%u, msg->tailout_ignore=%u\n", |
a812dcc3 DN |
404 | dest_partid, XPC_NET_CHANNEL, msg->buf_pa, msg->size, |
405 | msg->leadin_ignore, msg->tailout_ignore); | |
a7b4d509 DN |
406 | |
407 | atomic_inc(&queued_msg->use_count); | |
408 | ||
409 | ret = xpc_send_notify(dest_partid, XPC_NET_CHANNEL, XPC_NOWAIT, msg, | |
bd3e64c1 | 410 | msg_size, xpnet_send_completed, queued_msg); |
a7b4d509 DN |
411 | if (unlikely(ret != xpSuccess)) |
412 | atomic_dec(&queued_msg->use_count); | |
413 | } | |
414 | ||
a2d974da DN |
415 | /* |
416 | * Network layer has formatted a packet (skb) and is ready to place it | |
417 | * "on the wire". Prepare and send an xpnet_message to all partitions | |
418 | * which have connected with us and are targets of this packet. | |
419 | * | |
420 | * MAC-NOTE: For the XPNET driver, the MAC address contains the | |
a7b4d509 DN |
421 | * destination partid. If the destination partid octets are 0xffff, |
422 | * this packet is to be broadcast to all connected partitions. | |
a2d974da DN |
423 | */ |
424 | static int | |
425 | xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
426 | { | |
427 | struct xpnet_pending_msg *queued_msg; | |
a2d974da | 428 | u64 start_addr, end_addr; |
64d032ba | 429 | short dest_partid; |
a7b4d509 | 430 | u16 embedded_bytes = 0; |
a2d974da DN |
431 | |
432 | dev_dbg(xpnet, ">skb->head=0x%p skb->data=0x%p skb->tail=0x%p " | |
35190506 | 433 | "skb->end=0x%p skb->len=%d\n", (void *)skb->head, |
4305b541 | 434 | (void *)skb->data, skb_tail_pointer(skb), skb_end_pointer(skb), |
a2d974da DN |
435 | skb->len); |
436 | ||
a7b4d509 DN |
437 | if (skb->data[0] == 0x33) { |
438 | dev_kfree_skb(skb); | |
6ed10654 | 439 | return NETDEV_TX_OK; /* nothing needed to be done */ |
a7b4d509 DN |
440 | } |
441 | ||
a2d974da DN |
442 | /* |
443 | * The xpnet_pending_msg tracks how many outstanding | |
444 | * xpc_send_notifies are relying on this skb. When none | |
445 | * remain, release the skb. | |
446 | */ | |
447 | queued_msg = kmalloc(sizeof(struct xpnet_pending_msg), GFP_ATOMIC); | |
448 | if (queued_msg == NULL) { | |
449 | dev_warn(xpnet, "failed to kmalloc %ld bytes; dropping " | |
35190506 | 450 | "packet\n", sizeof(struct xpnet_pending_msg)); |
a2d974da | 451 | |
e8ac9c55 | 452 | dev->stats.tx_errors++; |
3790c8cd PM |
453 | dev_kfree_skb(skb); |
454 | return NETDEV_TX_OK; | |
a2d974da DN |
455 | } |
456 | ||
a2d974da | 457 | /* get the beginning of the first cacheline and end of last */ |
35190506 | 458 | start_addr = ((u64)skb->data & ~(L1_CACHE_BYTES - 1)); |
27a884dc | 459 | end_addr = L1_CACHE_ALIGN((u64)skb_tail_pointer(skb)); |
a2d974da DN |
460 | |
461 | /* calculate how many bytes to embed in the XPC message */ | |
a2d974da DN |
462 | if (unlikely(skb->len <= XPNET_MSG_DATA_MAX)) { |
463 | /* skb->data does fit so embed */ | |
464 | embedded_bytes = skb->len; | |
465 | } | |
466 | ||
a2d974da DN |
467 | /* |
468 | * Since the send occurs asynchronously, we set the count to one | |
469 | * and begin sending. Any sends that happen to complete before | |
470 | * we are done sending will not free the skb. We will be left | |
471 | * with that task during exit. This also handles the case of | |
472 | * a packet destined for a partition which is no longer up. | |
473 | */ | |
474 | atomic_set(&queued_msg->use_count, 1); | |
475 | queued_msg->skb = skb; | |
476 | ||
a7b4d509 | 477 | if (skb->data[0] == 0xff) { |
a2d974da | 478 | /* we are being asked to broadcast to all partitions */ |
984b3f57 | 479 | for_each_set_bit(dest_partid, xpnet_broadcast_partitions, |
a7b4d509 | 480 | xp_max_npartitions) { |
a2d974da | 481 | |
a7b4d509 DN |
482 | xpnet_send(skb, queued_msg, start_addr, end_addr, |
483 | embedded_bytes, dest_partid); | |
a2d974da | 484 | } |
a7b4d509 DN |
485 | } else { |
486 | dest_partid = (short)skb->data[XPNET_PARTID_OCTET + 1]; | |
487 | dest_partid |= (short)skb->data[XPNET_PARTID_OCTET + 0] << 8; | |
a2d974da | 488 | |
a7b4d509 DN |
489 | if (dest_partid >= 0 && |
490 | dest_partid < xp_max_npartitions && | |
491 | test_bit(dest_partid, xpnet_broadcast_partitions) != 0) { | |
a2d974da | 492 | |
a7b4d509 DN |
493 | xpnet_send(skb, queued_msg, start_addr, end_addr, |
494 | embedded_bytes, dest_partid); | |
a2d974da | 495 | } |
a2d974da DN |
496 | } |
497 | ||
498 | if (atomic_dec_return(&queued_msg->use_count) == 0) { | |
a2d974da DN |
499 | dev_kfree_skb(skb); |
500 | kfree(queued_msg); | |
501 | } | |
502 | ||
e8ac9c55 SH |
503 | dev->stats.tx_packets++; |
504 | dev->stats.tx_bytes += skb->len; | |
a2d974da | 505 | |
6ed10654 | 506 | return NETDEV_TX_OK; |
a2d974da DN |
507 | } |
508 | ||
a2d974da DN |
509 | /* |
510 | * Deal with transmit timeouts coming from the network layer. | |
511 | */ | |
512 | static void | |
35190506 | 513 | xpnet_dev_tx_timeout(struct net_device *dev) |
a2d974da | 514 | { |
e8ac9c55 | 515 | dev->stats.tx_errors++; |
a2d974da DN |
516 | } |
517 | ||
e8ac9c55 SH |
518 | static const struct net_device_ops xpnet_netdev_ops = { |
519 | .ndo_open = xpnet_dev_open, | |
520 | .ndo_stop = xpnet_dev_stop, | |
521 | .ndo_start_xmit = xpnet_dev_hard_start_xmit, | |
522 | .ndo_change_mtu = xpnet_dev_change_mtu, | |
523 | .ndo_tx_timeout = xpnet_dev_tx_timeout, | |
524 | .ndo_set_mac_address = eth_mac_addr, | |
525 | .ndo_validate_addr = eth_validate_addr, | |
526 | }; | |
527 | ||
a2d974da DN |
528 | static int __init |
529 | xpnet_init(void) | |
530 | { | |
a7b4d509 | 531 | int result; |
a2d974da | 532 | |
a7b4d509 | 533 | if (!is_shub() && !is_uv()) |
408865ce | 534 | return -ENODEV; |
408865ce | 535 | |
a2d974da DN |
536 | dev_info(xpnet, "registering network device %s\n", XPNET_DEVICE_NAME); |
537 | ||
a7b4d509 DN |
538 | xpnet_broadcast_partitions = kzalloc(BITS_TO_LONGS(xp_max_npartitions) * |
539 | sizeof(long), GFP_KERNEL); | |
540 | if (xpnet_broadcast_partitions == NULL) | |
541 | return -ENOMEM; | |
542 | ||
a2d974da DN |
543 | /* |
544 | * use ether_setup() to init the majority of our device | |
545 | * structure and then override the necessary pieces. | |
546 | */ | |
e8ac9c55 | 547 | xpnet_device = alloc_netdev(0, XPNET_DEVICE_NAME, ether_setup); |
a7b4d509 DN |
548 | if (xpnet_device == NULL) { |
549 | kfree(xpnet_broadcast_partitions); | |
a2d974da | 550 | return -ENOMEM; |
a7b4d509 | 551 | } |
a2d974da DN |
552 | |
553 | netif_carrier_off(xpnet_device); | |
554 | ||
714c48f1 | 555 | xpnet_device->netdev_ops = &xpnet_netdev_ops; |
a2d974da | 556 | xpnet_device->mtu = XPNET_DEF_MTU; |
a2d974da DN |
557 | |
558 | /* | |
559 | * Multicast assumes the LSB of the first octet is set for multicast | |
560 | * MAC addresses. We chose the first octet of the MAC to be unlikely | |
561 | * to collide with any vendor's officially issued MAC. | |
562 | */ | |
a7b4d509 DN |
563 | xpnet_device->dev_addr[0] = 0x02; /* locally administered, no OUI */ |
564 | ||
261f3b49 DN |
565 | xpnet_device->dev_addr[XPNET_PARTID_OCTET + 1] = xp_partition_id; |
566 | xpnet_device->dev_addr[XPNET_PARTID_OCTET + 0] = (xp_partition_id >> 8); | |
a2d974da DN |
567 | |
568 | /* | |
569 | * ether_setup() sets this to a multicast device. We are | |
570 | * really not supporting multicast at this time. | |
571 | */ | |
572 | xpnet_device->flags &= ~IFF_MULTICAST; | |
573 | ||
574 | /* | |
575 | * No need to checksum as it is a DMA transfer. The BTE will | |
576 | * report an error if the data is not retrievable and the | |
577 | * packet will be dropped. | |
578 | */ | |
579 | xpnet_device->features = NETIF_F_NO_CSUM; | |
580 | ||
581 | result = register_netdev(xpnet_device); | |
a7b4d509 | 582 | if (result != 0) { |
a2d974da | 583 | free_netdev(xpnet_device); |
a7b4d509 DN |
584 | kfree(xpnet_broadcast_partitions); |
585 | } | |
a2d974da DN |
586 | |
587 | return result; | |
588 | } | |
a2d974da | 589 | |
35190506 | 590 | module_init(xpnet_init); |
a2d974da DN |
591 | |
592 | static void __exit | |
593 | xpnet_exit(void) | |
594 | { | |
595 | dev_info(xpnet, "unregistering network device %s\n", | |
35190506 | 596 | xpnet_device[0].name); |
a2d974da DN |
597 | |
598 | unregister_netdev(xpnet_device); | |
a2d974da | 599 | free_netdev(xpnet_device); |
a7b4d509 | 600 | kfree(xpnet_broadcast_partitions); |
a2d974da | 601 | } |
a2d974da | 602 | |
35190506 | 603 | module_exit(xpnet_exit); |
a2d974da DN |
604 | |
605 | MODULE_AUTHOR("Silicon Graphics, Inc."); | |
606 | MODULE_DESCRIPTION("Cross Partition Network adapter (XPNET)"); | |
607 | MODULE_LICENSE("GPL"); |