]>
Commit | Line | Data |
---|---|---|
68905a14 DK |
1 | /* Copyright (c) 2012 - 2015 UNISYS CORPORATION |
2 | * All rights reserved. | |
3 | * | |
6f14cc18 BR |
4 | * This program is free software; you can redistribute it and/or modify it |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
68905a14 DK |
7 | * |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
11 | * NON INFRINGEMENT. See the GNU General Public License for more | |
12 | * details. | |
13 | */ | |
14 | ||
15 | /* This driver lives in a spar partition, and registers to ethernet io | |
16 | * channels from the visorbus driver. It creates netdev devices and | |
17 | * forwards transmit to the IO channel and accepts rcvs from the IO | |
18 | * Partition via the IO channel. | |
19 | */ | |
20 | ||
21 | #include <linux/debugfs.h> | |
68905a14 | 22 | #include <linux/etherdevice.h> |
0d507393 | 23 | #include <linux/netdevice.h> |
68905a14 | 24 | #include <linux/kthread.h> |
0d507393 NH |
25 | #include <linux/skbuff.h> |
26 | #include <linux/rtnetlink.h> | |
68905a14 DK |
27 | |
28 | #include "visorbus.h" | |
29 | #include "iochannel.h" | |
30 | ||
0c677e9c | 31 | #define VISORNIC_INFINITE_RSP_WAIT 0 |
68905a14 DK |
32 | #define VISORNICSOPENMAX 32 |
33 | #define MAXDEVICES 16384 | |
34 | ||
35 | /* MAX_BUF = 64 lines x 32 MAXVNIC x 80 characters | |
36 | * = 163840 bytes | |
37 | */ | |
38 | #define MAX_BUF 163840 | |
39 | ||
40 | static spinlock_t dev_num_pool_lock; | |
41 | static void *dev_num_pool; /**< pool to grab device numbers from */ | |
42 | ||
43 | static int visornic_probe(struct visor_device *dev); | |
44 | static void visornic_remove(struct visor_device *dev); | |
45 | static int visornic_pause(struct visor_device *dev, | |
46 | visorbus_state_complete_func complete_func); | |
47 | static int visornic_resume(struct visor_device *dev, | |
48 | visorbus_state_complete_func complete_func); | |
49 | ||
50 | /* DEBUGFS declarations */ | |
51 | static ssize_t info_debugfs_read(struct file *file, char __user *buf, | |
52 | size_t len, loff_t *offset); | |
53 | static ssize_t enable_ints_write(struct file *file, const char __user *buf, | |
54 | size_t len, loff_t *ppos); | |
55 | static struct dentry *visornic_debugfs_dir; | |
56 | static const struct file_operations debugfs_info_fops = { | |
57 | .read = info_debugfs_read, | |
58 | }; | |
59 | ||
60 | static const struct file_operations debugfs_enable_ints_fops = { | |
61 | .write = enable_ints_write, | |
62 | }; | |
63 | ||
68905a14 DK |
64 | static struct workqueue_struct *visornic_timeout_reset_workqueue; |
65 | ||
66 | /* GUIDS for director channel type supported by this driver. */ | |
67 | static struct visor_channeltype_descriptor visornic_channel_types[] = { | |
68 | /* Note that the only channel type we expect to be reported by the | |
69 | * bus driver is the SPAR_VNIC channel. | |
70 | */ | |
71 | { SPAR_VNIC_CHANNEL_PROTOCOL_UUID, "ultravnic" }, | |
72 | { NULL_UUID_LE, NULL } | |
73 | }; | |
110a66be PB |
74 | MODULE_DEVICE_TABLE(visorbus, visornic_channel_types); |
75 | /* | |
76 | * FIXME XXX: This next line of code must be fixed and removed before | |
77 | * acceptance into the 'normal' part of the kernel. It is only here as a place | |
78 | * holder to get module autoloading functionality working for visorbus. Code | |
79 | * must be added to scripts/mode/file2alias.c, etc., to get this working | |
80 | * properly. | |
81 | */ | |
82 | MODULE_ALIAS("visorbus:" SPAR_VNIC_CHANNEL_PROTOCOL_UUID_STR); | |
68905a14 DK |
83 | |
84 | /* This is used to tell the visor bus driver which types of visor devices | |
85 | * we support, and what functions to call when a visor device that we support | |
86 | * is attached or removed. | |
87 | */ | |
88 | static struct visor_driver visornic_driver = { | |
89 | .name = "visornic", | |
90 | .version = "1.0.0.0", | |
91 | .vertag = NULL, | |
92 | .owner = THIS_MODULE, | |
93 | .channel_types = visornic_channel_types, | |
94 | .probe = visornic_probe, | |
95 | .remove = visornic_remove, | |
96 | .pause = visornic_pause, | |
97 | .resume = visornic_resume, | |
98 | .channel_interrupt = NULL, | |
99 | }; | |
100 | ||
68905a14 DK |
101 | struct chanstat { |
102 | unsigned long got_rcv; | |
103 | unsigned long got_enbdisack; | |
104 | unsigned long got_xmit_done; | |
105 | unsigned long xmit_fail; | |
106 | unsigned long sent_enbdis; | |
107 | unsigned long sent_promisc; | |
108 | unsigned long sent_post; | |
81d275c6 | 109 | unsigned long sent_post_failed; |
68905a14 DK |
110 | unsigned long sent_xmit; |
111 | unsigned long reject_count; | |
112 | unsigned long extra_rcvbufs_sent; | |
113 | }; | |
114 | ||
115 | struct visornic_devdata { | |
116 | int devnum; | |
68905a14 DK |
117 | unsigned short enabled; /* 0 disabled 1 enabled to receive */ |
118 | unsigned short enab_dis_acked; /* NET_RCV_ENABLE/DISABLE acked by | |
119 | * IOPART | |
120 | */ | |
121 | struct visor_device *dev; | |
122 | char name[99]; | |
123 | struct list_head list_all; /* < link within list_all_devices list */ | |
68905a14 DK |
124 | struct net_device *netdev; |
125 | struct net_device_stats net_stats; | |
126 | atomic_t interrupt_rcvd; | |
127 | wait_queue_head_t rsp_queue; | |
128 | struct sk_buff **rcvbuf; | |
129 | u64 uniquenum; /* TODO figure out why not used */ | |
130 | unsigned short old_flags; /* flags as they were prior to | |
131 | * set_multicast_list | |
132 | */ | |
133 | atomic_t usage; /* count of users */ | |
134 | int num_rcv_bufs; /* indicates how many rcv buffers | |
135 | * the vnic will post | |
136 | */ | |
137 | int num_rcv_bufs_could_not_alloc; | |
138 | atomic_t num_rcvbuf_in_iovm; | |
139 | unsigned long alloc_failed_in_if_needed_cnt; | |
140 | unsigned long alloc_failed_in_repost_rtn_cnt; | |
36927c18 TS |
141 | unsigned long max_outstanding_net_xmits; /* absolute max number of |
142 | * outstanding xmits - should | |
143 | * never hit this | |
144 | */ | |
145 | unsigned long upper_threshold_net_xmits; /* high water mark for | |
146 | * calling netif_stop_queue() | |
147 | */ | |
148 | unsigned long lower_threshold_net_xmits; /* high water mark for calling | |
149 | * netif_wake_queue() | |
150 | */ | |
68905a14 DK |
151 | struct sk_buff_head xmitbufhead; /* xmitbufhead is the head of the |
152 | * xmit buffer list that have been | |
153 | * sent to the IOPART end | |
154 | */ | |
d01da5ea | 155 | visorbus_state_complete_func server_down_complete_func; |
68905a14 DK |
156 | struct work_struct timeout_reset; |
157 | struct uiscmdrsp *cmdrsp_rcv; /* cmdrsp_rcv is used for | |
158 | * posting/unposting rcv buffers | |
159 | */ | |
160 | struct uiscmdrsp *xmit_cmdrsp; /* used to issue NET_XMIT - there is | |
161 | * never more that one xmit in | |
162 | * progress at a time | |
163 | */ | |
164 | bool server_down; /* IOPART is down */ | |
165 | bool server_change_state; /* Processing SERVER_CHANGESTATE msg */ | |
46df8226 | 166 | bool going_away; /* device is being torn down */ |
68905a14 | 167 | struct dentry *eth_debugfs_dir; |
68905a14 DK |
168 | u64 interrupts_rcvd; |
169 | u64 interrupts_notme; | |
170 | u64 interrupts_disabled; | |
171 | u64 busy_cnt; | |
172 | spinlock_t priv_lock; /* spinlock to access devdata structures */ | |
173 | ||
174 | /* flow control counter */ | |
175 | u64 flow_control_upper_hits; | |
176 | u64 flow_control_lower_hits; | |
177 | ||
178 | /* debug counters */ | |
179 | unsigned long n_rcv0; /* # rcvs of 0 buffers */ | |
180 | unsigned long n_rcv1; /* # rcvs of 1 buffers */ | |
181 | unsigned long n_rcv2; /* # rcvs of 2 buffers */ | |
182 | unsigned long n_rcvx; /* # rcvs of >2 buffers */ | |
183 | unsigned long found_repost_rcvbuf_cnt; /* # times we called | |
184 | * repost_rcvbuf_cnt | |
185 | */ | |
186 | unsigned long repost_found_skb_cnt; /* # times found the skb */ | |
187 | unsigned long n_repost_deficit; /* # times we couldn't find | |
188 | * all of the rcv buffers | |
189 | */ | |
190 | unsigned long bad_rcv_buf; /* # times we negleted to | |
191 | * free the rcv skb because | |
192 | * we didn't know where it | |
193 | * came from | |
194 | */ | |
195 | unsigned long n_rcv_packets_not_accepted;/* # bogs rcv packets */ | |
196 | ||
197 | int queuefullmsg_logged; | |
198 | struct chanstat chstat; | |
946b2546 NH |
199 | struct timer_list irq_poll_timer; |
200 | struct napi_struct napi; | |
201 | struct uiscmdrsp cmdrsp[SIZEOF_CMDRSP]; | |
68905a14 DK |
202 | }; |
203 | ||
68905a14 DK |
204 | |
205 | /* List of all visornic_devdata structs, | |
206 | * linked via the list_all member | |
207 | */ | |
208 | static LIST_HEAD(list_all_devices); | |
209 | static DEFINE_SPINLOCK(lock_all_devices); | |
946b2546 NH |
210 | static int visornic_poll(struct napi_struct *napi, int budget); |
211 | static void poll_for_irq(unsigned long v); | |
68905a14 DK |
212 | |
213 | /** | |
214 | * visor_copy_fragsinfo_from_skb( | |
215 | * @skb_in: skbuff that we are pulling the frags from | |
216 | * @firstfraglen: length of first fragment in skb | |
217 | * @frags_max: max len of frags array | |
218 | * @frags: frags array filled in on output | |
219 | * | |
220 | * Copy the fragment list in the SKB to a phys_info | |
221 | * array that the IOPART understands. | |
222 | * Return value indicates number of entries filled in frags | |
223 | * Negative values indicate an error. | |
224 | */ | |
225 | static unsigned int | |
226 | visor_copy_fragsinfo_from_skb(struct sk_buff *skb, unsigned int firstfraglen, | |
227 | unsigned int frags_max, | |
228 | struct phys_info frags[]) | |
229 | { | |
230 | unsigned int count = 0, ii, size, offset = 0, numfrags; | |
513e1cbd | 231 | unsigned int total_count; |
68905a14 DK |
232 | |
233 | numfrags = skb_shinfo(skb)->nr_frags; | |
234 | ||
513e1cbd NH |
235 | /* |
236 | * Compute the number of fragments this skb has, and if its more than | |
237 | * frag array can hold, linearize the skb | |
238 | */ | |
239 | total_count = numfrags + (firstfraglen / PI_PAGE_SIZE); | |
240 | if (firstfraglen % PI_PAGE_SIZE) | |
241 | total_count++; | |
242 | ||
243 | if (total_count > frags_max) { | |
244 | if (skb_linearize(skb)) | |
245 | return -EINVAL; | |
246 | numfrags = skb_shinfo(skb)->nr_frags; | |
247 | firstfraglen = 0; | |
248 | } | |
249 | ||
68905a14 DK |
250 | while (firstfraglen) { |
251 | if (count == frags_max) | |
252 | return -EINVAL; | |
253 | ||
254 | frags[count].pi_pfn = | |
255 | page_to_pfn(virt_to_page(skb->data + offset)); | |
256 | frags[count].pi_off = | |
257 | (unsigned long)(skb->data + offset) & PI_PAGE_MASK; | |
258 | size = min_t(unsigned int, firstfraglen, | |
259 | PI_PAGE_SIZE - frags[count].pi_off); | |
260 | ||
261 | /* can take smallest of firstfraglen (what's left) OR | |
262 | * bytes left in the page | |
263 | */ | |
264 | frags[count].pi_len = size; | |
265 | firstfraglen -= size; | |
266 | offset += size; | |
267 | count++; | |
268 | } | |
269 | if (numfrags) { | |
270 | if ((count + numfrags) > frags_max) | |
271 | return -EINVAL; | |
272 | ||
273 | for (ii = 0; ii < numfrags; ii++) { | |
274 | count = add_physinfo_entries(page_to_pfn( | |
275 | skb_frag_page(&skb_shinfo(skb)->frags[ii])), | |
276 | skb_shinfo(skb)->frags[ii]. | |
277 | page_offset, | |
278 | skb_shinfo(skb)->frags[ii]. | |
279 | size, count, frags_max, frags); | |
998ff7f8 NH |
280 | /* |
281 | * add_physinfo_entries only returns | |
282 | * zero if the frags array is out of room | |
283 | * That should never happen because we | |
284 | * fail above, if count+numfrags > frags_max. | |
285 | * Given that theres no recovery mechanism from putting | |
286 | * half a packet in the I/O channel, panic here as this | |
287 | * should never happen | |
288 | */ | |
289 | BUG_ON(!count); | |
68905a14 DK |
290 | } |
291 | } | |
292 | if (skb_shinfo(skb)->frag_list) { | |
293 | struct sk_buff *skbinlist; | |
294 | int c; | |
295 | ||
296 | for (skbinlist = skb_shinfo(skb)->frag_list; skbinlist; | |
297 | skbinlist = skbinlist->next) { | |
298 | c = visor_copy_fragsinfo_from_skb(skbinlist, | |
299 | skbinlist->len - | |
300 | skbinlist->data_len, | |
301 | frags_max - count, | |
302 | &frags[count]); | |
303 | if (c < 0) | |
304 | return c; | |
305 | count += c; | |
306 | } | |
307 | } | |
308 | return count; | |
309 | } | |
310 | ||
68905a14 DK |
311 | static ssize_t enable_ints_write(struct file *file, |
312 | const char __user *buffer, | |
313 | size_t count, loff_t *ppos) | |
314 | { | |
52b1660d NH |
315 | /* |
316 | * Don't want to break ABI here by having a debugfs | |
317 | * file that no longer exists or is writable, so | |
318 | * lets just make this a vestigual function | |
319 | */ | |
68905a14 DK |
320 | return count; |
321 | } | |
322 | ||
323 | /** | |
324 | * visornic_serverdown_complete - IOPART went down, need to pause | |
325 | * device | |
326 | * @work: Work queue it was scheduled on | |
327 | * | |
328 | * The IO partition has gone down and we need to do some cleanup | |
329 | * for when it comes back. Treat the IO partition as the link | |
330 | * being down. | |
331 | * Returns void. | |
332 | */ | |
333 | static void | |
ace72eef | 334 | visornic_serverdown_complete(struct visornic_devdata *devdata) |
68905a14 | 335 | { |
68905a14 | 336 | struct net_device *netdev; |
68905a14 | 337 | |
68905a14 DK |
338 | netdev = devdata->netdev; |
339 | ||
946b2546 NH |
340 | /* Stop polling for interrupts */ |
341 | del_timer_sync(&devdata->irq_poll_timer); | |
68905a14 | 342 | |
0d507393 NH |
343 | rtnl_lock(); |
344 | dev_close(netdev); | |
345 | rtnl_unlock(); | |
68905a14 | 346 | |
68905a14 | 347 | atomic_set(&devdata->num_rcvbuf_in_iovm, 0); |
db849927 TS |
348 | devdata->chstat.sent_xmit = 0; |
349 | devdata->chstat.got_xmit_done = 0; | |
68905a14 | 350 | |
d01da5ea TS |
351 | if (devdata->server_down_complete_func) |
352 | (*devdata->server_down_complete_func)(devdata->dev, 0); | |
353 | ||
68905a14 DK |
354 | devdata->server_down = true; |
355 | devdata->server_change_state = false; | |
d01da5ea | 356 | devdata->server_down_complete_func = NULL; |
68905a14 DK |
357 | } |
358 | ||
359 | /** | |
360 | * visornic_serverdown - Command has notified us that IOPARt is down | |
361 | * @devdata: device that is being managed by IOPART | |
362 | * | |
363 | * Schedule the work needed to handle the server down request. Make | |
364 | * sure we haven't already handled the server change state event. | |
365 | * Returns 0 if we scheduled the work, -EINVAL on error. | |
366 | */ | |
367 | static int | |
d01da5ea TS |
368 | visornic_serverdown(struct visornic_devdata *devdata, |
369 | visorbus_state_complete_func complete_func) | |
68905a14 | 370 | { |
46df8226 TS |
371 | unsigned long flags; |
372 | ||
373 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
68905a14 | 374 | if (!devdata->server_down && !devdata->server_change_state) { |
46df8226 TS |
375 | if (devdata->going_away) { |
376 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
377 | dev_dbg(&devdata->dev->device, | |
378 | "%s aborting because device removal pending\n", | |
379 | __func__); | |
380 | return -ENODEV; | |
381 | } | |
68905a14 | 382 | devdata->server_change_state = true; |
d01da5ea | 383 | devdata->server_down_complete_func = complete_func; |
6f562b21 | 384 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
ace72eef | 385 | visornic_serverdown_complete(devdata); |
68905a14 | 386 | } else if (devdata->server_change_state) { |
00748b0c TS |
387 | dev_dbg(&devdata->dev->device, "%s changing state\n", |
388 | __func__); | |
46df8226 | 389 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
68905a14 | 390 | return -EINVAL; |
6f562b21 TS |
391 | } else |
392 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
68905a14 DK |
393 | return 0; |
394 | } | |
395 | ||
396 | /** | |
397 | * alloc_rcv_buf - alloc rcv buffer to be given to the IO Partition. | |
398 | * @netdev: network adapter the rcv bufs are attached too. | |
399 | * | |
400 | * Create an sk_buff (rcv_buf) that will be passed to the IO Partition | |
401 | * so that it can write rcv data into our memory space. | |
402 | * Return pointer to sk_buff | |
403 | */ | |
404 | static struct sk_buff * | |
405 | alloc_rcv_buf(struct net_device *netdev) | |
406 | { | |
407 | struct sk_buff *skb; | |
408 | ||
409 | /* NOTE: the first fragment in each rcv buffer is pointed to by | |
410 | * rcvskb->data. For now all rcv buffers will be RCVPOST_BUF_SIZE | |
411 | * in length, so the firstfrag is large enough to hold 1514. | |
412 | */ | |
413 | skb = alloc_skb(RCVPOST_BUF_SIZE, GFP_ATOMIC); | |
414 | if (!skb) | |
415 | return NULL; | |
416 | skb->dev = netdev; | |
417 | skb->len = RCVPOST_BUF_SIZE; | |
418 | /* current value of mtu doesn't come into play here; large | |
419 | * packets will just end up using multiple rcv buffers all of | |
420 | * same size | |
421 | */ | |
422 | skb->data_len = 0; /* dev_alloc_skb already zeroes it out | |
423 | * for clarification. | |
424 | */ | |
425 | return skb; | |
426 | } | |
427 | ||
428 | /** | |
429 | * post_skb - post a skb to the IO Partition. | |
430 | * @cmdrsp: cmdrsp packet to be send to the IO Partition | |
431 | * @devdata: visornic_devdata to post the skb too | |
432 | * @skb: skb to give to the IO partition | |
433 | * | |
434 | * Send the skb to the IO Partition. | |
435 | * Returns void | |
436 | */ | |
437 | static inline void | |
438 | post_skb(struct uiscmdrsp *cmdrsp, | |
439 | struct visornic_devdata *devdata, struct sk_buff *skb) | |
440 | { | |
441 | cmdrsp->net.buf = skb; | |
442 | cmdrsp->net.rcvpost.frag.pi_pfn = page_to_pfn(virt_to_page(skb->data)); | |
443 | cmdrsp->net.rcvpost.frag.pi_off = | |
444 | (unsigned long)skb->data & PI_PAGE_MASK; | |
445 | cmdrsp->net.rcvpost.frag.pi_len = skb->len; | |
446 | cmdrsp->net.rcvpost.unique_num = devdata->uniquenum; | |
447 | ||
448 | if ((cmdrsp->net.rcvpost.frag.pi_off + skb->len) <= PI_PAGE_SIZE) { | |
449 | cmdrsp->net.type = NET_RCV_POST; | |
450 | cmdrsp->cmdtype = CMD_NET_TYPE; | |
81d275c6 | 451 | if (visorchannel_signalinsert(devdata->dev->visorchannel, |
68905a14 | 452 | IOCHAN_TO_IOPART, |
81d275c6 TS |
453 | cmdrsp)) { |
454 | atomic_inc(&devdata->num_rcvbuf_in_iovm); | |
455 | devdata->chstat.sent_post++; | |
456 | } else { | |
457 | devdata->chstat.sent_post_failed++; | |
458 | } | |
68905a14 DK |
459 | } |
460 | } | |
461 | ||
462 | /** | |
463 | * send_enbdis - send NET_RCV_ENBDIS to IO Partition | |
464 | * @netdev: netdevice we are enable/disable, used as context | |
465 | * return value | |
466 | * @state: enable = 1/disable = 0 | |
467 | * @devdata: visornic device we are enabling/disabling | |
468 | * | |
469 | * Send the enable/disable message to the IO Partition. | |
470 | * Returns void | |
471 | */ | |
472 | static void | |
473 | send_enbdis(struct net_device *netdev, int state, | |
474 | struct visornic_devdata *devdata) | |
475 | { | |
476 | devdata->cmdrsp_rcv->net.enbdis.enable = state; | |
477 | devdata->cmdrsp_rcv->net.enbdis.context = netdev; | |
478 | devdata->cmdrsp_rcv->net.type = NET_RCV_ENBDIS; | |
479 | devdata->cmdrsp_rcv->cmdtype = CMD_NET_TYPE; | |
81d275c6 | 480 | if (visorchannel_signalinsert(devdata->dev->visorchannel, |
68905a14 | 481 | IOCHAN_TO_IOPART, |
81d275c6 TS |
482 | devdata->cmdrsp_rcv)) |
483 | devdata->chstat.sent_enbdis++; | |
68905a14 DK |
484 | } |
485 | ||
486 | /** | |
487 | * visornic_disable_with_timeout - Disable network adapter | |
488 | * @netdev: netdevice to disale | |
489 | * @timeout: timeout to wait for disable | |
490 | * | |
491 | * Disable the network adapter and inform the IO Partition that we | |
492 | * are disabled, reclaim memory from rcv bufs. | |
493 | * Returns 0 on success, negative for failure of IO Partition | |
494 | * responding. | |
495 | * | |
496 | */ | |
497 | static int | |
498 | visornic_disable_with_timeout(struct net_device *netdev, const int timeout) | |
499 | { | |
500 | struct visornic_devdata *devdata = netdev_priv(netdev); | |
501 | int i; | |
502 | unsigned long flags; | |
503 | int wait = 0; | |
504 | ||
68905a14 DK |
505 | /* send a msg telling the other end we are stopping incoming pkts */ |
506 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
507 | devdata->enabled = 0; | |
508 | devdata->enab_dis_acked = 0; /* must wait for ack */ | |
509 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
510 | ||
511 | /* send disable and wait for ack -- don't hold lock when sending | |
512 | * disable because if the queue is full, insert might sleep. | |
513 | */ | |
514 | send_enbdis(netdev, 0, devdata); | |
515 | ||
516 | /* wait for ack to arrive before we try to free rcv buffers | |
517 | * NOTE: the other end automatically unposts the rcv buffers when | |
518 | * when it gets a disable. | |
519 | */ | |
520 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
0c677e9c | 521 | while ((timeout == VISORNIC_INFINITE_RSP_WAIT) || |
68905a14 DK |
522 | (wait < timeout)) { |
523 | if (devdata->enab_dis_acked) | |
524 | break; | |
525 | if (devdata->server_down || devdata->server_change_state) { | |
526 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
00748b0c TS |
527 | dev_dbg(&netdev->dev, "%s server went away\n", |
528 | __func__); | |
68905a14 DK |
529 | return -EIO; |
530 | } | |
531 | set_current_state(TASK_INTERRUPTIBLE); | |
532 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
533 | wait += schedule_timeout(msecs_to_jiffies(10)); | |
534 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
535 | } | |
536 | ||
537 | /* Wait for usage to go to 1 (no other users) before freeing | |
538 | * rcv buffers | |
539 | */ | |
540 | if (atomic_read(&devdata->usage) > 1) { | |
541 | while (1) { | |
542 | set_current_state(TASK_INTERRUPTIBLE); | |
543 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
544 | schedule_timeout(msecs_to_jiffies(10)); | |
545 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
546 | if (atomic_read(&devdata->usage)) | |
547 | break; | |
548 | } | |
549 | } | |
68905a14 DK |
550 | /* we've set enabled to 0, so we can give up the lock. */ |
551 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
552 | ||
946b2546 NH |
553 | /* stop the transmit queue so nothing more can be transmitted */ |
554 | netif_stop_queue(netdev); | |
555 | ||
556 | napi_disable(&devdata->napi); | |
557 | ||
0d507393 NH |
558 | skb_queue_purge(&devdata->xmitbufhead); |
559 | ||
68905a14 DK |
560 | /* Free rcv buffers - other end has automatically unposed them on |
561 | * disable | |
562 | */ | |
563 | for (i = 0; i < devdata->num_rcv_bufs; i++) { | |
564 | if (devdata->rcvbuf[i]) { | |
565 | kfree_skb(devdata->rcvbuf[i]); | |
566 | devdata->rcvbuf[i] = NULL; | |
567 | } | |
568 | } | |
569 | ||
68905a14 DK |
570 | return 0; |
571 | } | |
572 | ||
573 | /** | |
574 | * init_rcv_bufs -- initialize receive bufs and send them to the IO Part | |
575 | * @netdev: struct netdevice | |
576 | * @devdata: visornic_devdata | |
577 | * | |
578 | * Allocate rcv buffers and post them to the IO Partition. | |
579 | * Return 0 for success, and negative for failure. | |
580 | */ | |
581 | static int | |
582 | init_rcv_bufs(struct net_device *netdev, struct visornic_devdata *devdata) | |
583 | { | |
584 | int i, count; | |
585 | ||
586 | /* allocate fixed number of receive buffers to post to uisnic | |
587 | * post receive buffers after we've allocated a required amount | |
588 | */ | |
589 | for (i = 0; i < devdata->num_rcv_bufs; i++) { | |
590 | devdata->rcvbuf[i] = alloc_rcv_buf(netdev); | |
591 | if (!devdata->rcvbuf[i]) | |
592 | break; /* if we failed to allocate one let us stop */ | |
593 | } | |
594 | if (i == 0) /* couldn't even allocate one -- bail out */ | |
595 | return -ENOMEM; | |
596 | count = i; | |
597 | ||
598 | /* Ensure we can alloc 2/3rd of the requeested number of buffers. | |
599 | * 2/3 is an arbitrary choice; used also in ndis init.c | |
600 | */ | |
601 | if (count < ((2 * devdata->num_rcv_bufs) / 3)) { | |
602 | /* free receive buffers we did alloc and then bail out */ | |
603 | for (i = 0; i < count; i++) { | |
604 | kfree_skb(devdata->rcvbuf[i]); | |
605 | devdata->rcvbuf[i] = NULL; | |
606 | } | |
607 | return -ENOMEM; | |
608 | } | |
609 | ||
610 | /* post receive buffers to receive incoming input - without holding | |
611 | * lock - we've not enabled nor started the queue so there shouldn't | |
612 | * be any rcv or xmit activity | |
613 | */ | |
614 | for (i = 0; i < count; i++) | |
615 | post_skb(devdata->cmdrsp_rcv, devdata, devdata->rcvbuf[i]); | |
616 | ||
617 | return 0; | |
618 | } | |
619 | ||
620 | /** | |
621 | * visornic_enable_with_timeout - send enable to IO Part | |
622 | * @netdev: struct net_device | |
623 | * @timeout: Time to wait for the ACK from the enable | |
624 | * | |
625 | * Sends enable to IOVM, inits, and posts receive buffers to IOVM | |
626 | * timeout is defined in msecs (timeout of 0 specifies infinite wait) | |
627 | * Return 0 for success, negavite for failure. | |
628 | */ | |
629 | static int | |
630 | visornic_enable_with_timeout(struct net_device *netdev, const int timeout) | |
631 | { | |
632 | int i; | |
633 | struct visornic_devdata *devdata = netdev_priv(netdev); | |
634 | unsigned long flags; | |
635 | int wait = 0; | |
636 | ||
637 | /* NOTE: the other end automatically unposts the rcv buffers when it | |
638 | * gets a disable. | |
639 | */ | |
640 | i = init_rcv_bufs(netdev, devdata); | |
00748b0c TS |
641 | if (i < 0) { |
642 | dev_err(&netdev->dev, | |
643 | "%s failed to init rcv bufs (%d)\n", __func__, i); | |
68905a14 | 644 | return i; |
00748b0c | 645 | } |
68905a14 DK |
646 | |
647 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
648 | devdata->enabled = 1; | |
6483783d | 649 | devdata->enab_dis_acked = 0; |
68905a14 DK |
650 | |
651 | /* now we're ready, let's send an ENB to uisnic but until we get | |
652 | * an ACK back from uisnic, we'll drop the packets | |
653 | */ | |
654 | devdata->n_rcv_packets_not_accepted = 0; | |
655 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
656 | ||
657 | /* send enable and wait for ack -- don't hold lock when sending enable | |
658 | * because if the queue is full, insert might sleep. | |
659 | */ | |
946b2546 | 660 | napi_enable(&devdata->napi); |
68905a14 DK |
661 | send_enbdis(netdev, 1, devdata); |
662 | ||
663 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
0c677e9c | 664 | while ((timeout == VISORNIC_INFINITE_RSP_WAIT) || |
68905a14 DK |
665 | (wait < timeout)) { |
666 | if (devdata->enab_dis_acked) | |
667 | break; | |
668 | if (devdata->server_down || devdata->server_change_state) { | |
669 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
00748b0c TS |
670 | dev_dbg(&netdev->dev, "%s server went away\n", |
671 | __func__); | |
68905a14 DK |
672 | return -EIO; |
673 | } | |
674 | set_current_state(TASK_INTERRUPTIBLE); | |
675 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
676 | wait += schedule_timeout(msecs_to_jiffies(10)); | |
677 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
678 | } | |
679 | ||
680 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
681 | ||
00748b0c TS |
682 | if (!devdata->enab_dis_acked) { |
683 | dev_err(&netdev->dev, "%s missing ACK\n", __func__); | |
68905a14 | 684 | return -EIO; |
00748b0c | 685 | } |
68905a14 | 686 | |
35a8dd31 | 687 | netif_start_queue(netdev); |
946b2546 | 688 | |
68905a14 DK |
689 | return 0; |
690 | } | |
691 | ||
692 | /** | |
693 | * visornic_timeout_reset - handle xmit timeout resets | |
694 | * @work work item that scheduled the work | |
695 | * | |
696 | * Transmit Timeouts are typically handled by resetting the | |
697 | * device for our virtual NIC we will send a Disable and Enable | |
698 | * to the IOVM. If it doesn't respond we will trigger a serverdown. | |
699 | */ | |
700 | static void | |
701 | visornic_timeout_reset(struct work_struct *work) | |
702 | { | |
703 | struct visornic_devdata *devdata; | |
704 | struct net_device *netdev; | |
705 | int response = 0; | |
706 | ||
707 | devdata = container_of(work, struct visornic_devdata, timeout_reset); | |
708 | netdev = devdata->netdev; | |
709 | ||
4d79002e TS |
710 | rtnl_lock(); |
711 | if (!netif_running(netdev)) { | |
712 | rtnl_unlock(); | |
713 | return; | |
714 | } | |
715 | ||
0c677e9c NH |
716 | response = visornic_disable_with_timeout(netdev, |
717 | VISORNIC_INFINITE_RSP_WAIT); | |
68905a14 DK |
718 | if (response) |
719 | goto call_serverdown; | |
720 | ||
0c677e9c NH |
721 | response = visornic_enable_with_timeout(netdev, |
722 | VISORNIC_INFINITE_RSP_WAIT); | |
68905a14 DK |
723 | if (response) |
724 | goto call_serverdown; | |
68905a14 | 725 | |
4d79002e TS |
726 | rtnl_unlock(); |
727 | ||
68905a14 DK |
728 | return; |
729 | ||
730 | call_serverdown: | |
d01da5ea | 731 | visornic_serverdown(devdata, NULL); |
4d79002e | 732 | rtnl_unlock(); |
68905a14 DK |
733 | } |
734 | ||
735 | /** | |
736 | * visornic_open - Enable the visornic device and mark the queue started | |
737 | * @netdev: netdevice to start | |
738 | * | |
739 | * Enable the device and start the transmit queue. | |
740 | * Return 0 for success | |
741 | */ | |
742 | static int | |
743 | visornic_open(struct net_device *netdev) | |
744 | { | |
0c677e9c | 745 | visornic_enable_with_timeout(netdev, VISORNIC_INFINITE_RSP_WAIT); |
68905a14 | 746 | |
68905a14 DK |
747 | return 0; |
748 | } | |
749 | ||
750 | /** | |
751 | * visornic_close - Disables the visornic device and stops the queues | |
752 | * @netdev: netdevice to start | |
753 | * | |
754 | * Disable the device and stop the transmit queue. | |
755 | * Return 0 for success | |
756 | */ | |
757 | static int | |
758 | visornic_close(struct net_device *netdev) | |
759 | { | |
0c677e9c | 760 | visornic_disable_with_timeout(netdev, VISORNIC_INFINITE_RSP_WAIT); |
68905a14 DK |
761 | |
762 | return 0; | |
763 | } | |
764 | ||
36927c18 TS |
765 | /** |
766 | * devdata_xmits_outstanding - compute outstanding xmits | |
767 | * @devdata: visornic_devdata for device | |
768 | * | |
769 | * Return value is the number of outstanding xmits. | |
770 | */ | |
771 | static unsigned long devdata_xmits_outstanding(struct visornic_devdata *devdata) | |
772 | { | |
773 | if (devdata->chstat.sent_xmit >= devdata->chstat.got_xmit_done) | |
774 | return devdata->chstat.sent_xmit - | |
775 | devdata->chstat.got_xmit_done; | |
776 | else | |
777 | return (ULONG_MAX - devdata->chstat.got_xmit_done | |
778 | + devdata->chstat.sent_xmit + 1); | |
779 | } | |
780 | ||
781 | /** | |
782 | * vnic_hit_high_watermark | |
783 | * @devdata: indicates visornic device we are checking | |
784 | * @high_watermark: max num of unacked xmits we will tolerate, | |
785 | * before we will start throttling | |
786 | * | |
787 | * Returns true iff the number of unacked xmits sent to | |
788 | * the IO partition is >= high_watermark. | |
789 | */ | |
790 | static inline bool vnic_hit_high_watermark(struct visornic_devdata *devdata, | |
791 | ulong high_watermark) | |
792 | { | |
793 | return (devdata_xmits_outstanding(devdata) >= high_watermark); | |
794 | } | |
795 | ||
796 | /** | |
797 | * vnic_hit_low_watermark | |
798 | * @devdata: indicates visornic device we are checking | |
799 | * @low_watermark: we will wait until the num of unacked xmits | |
800 | * drops to this value or lower before we start | |
801 | * transmitting again | |
802 | * | |
803 | * Returns true iff the number of unacked xmits sent to | |
804 | * the IO partition is <= low_watermark. | |
805 | */ | |
806 | static inline bool vnic_hit_low_watermark(struct visornic_devdata *devdata, | |
807 | ulong low_watermark) | |
808 | { | |
809 | return (devdata_xmits_outstanding(devdata) <= low_watermark); | |
810 | } | |
811 | ||
68905a14 DK |
812 | /** |
813 | * visornic_xmit - send a packet to the IO Partition | |
814 | * @skb: Packet to be sent | |
815 | * @netdev: net device the packet is being sent from | |
816 | * | |
817 | * Convert the skb to a cmdrsp so the IO Partition can undersand it. | |
818 | * Send the XMIT command to the IO Partition for processing. This | |
819 | * function is protected from concurrent calls by a spinlock xmit_lock | |
820 | * in the net_device struct, but as soon as the function returns it | |
821 | * can be called again. | |
f6346ad6 | 822 | * Returns NETDEV_TX_OK. |
68905a14 DK |
823 | */ |
824 | static int | |
825 | visornic_xmit(struct sk_buff *skb, struct net_device *netdev) | |
826 | { | |
827 | struct visornic_devdata *devdata; | |
828 | int len, firstfraglen, padlen; | |
829 | struct uiscmdrsp *cmdrsp = NULL; | |
830 | unsigned long flags; | |
831 | ||
832 | devdata = netdev_priv(netdev); | |
833 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
834 | ||
835 | if (netif_queue_stopped(netdev) || devdata->server_down || | |
836 | devdata->server_change_state) { | |
837 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
838 | devdata->busy_cnt++; | |
00748b0c TS |
839 | dev_dbg(&netdev->dev, |
840 | "%s busy - queue stopped\n", __func__); | |
f6346ad6 NH |
841 | kfree_skb(skb); |
842 | return NETDEV_TX_OK; | |
68905a14 DK |
843 | } |
844 | ||
845 | /* sk_buff struct is used to host network data throughout all the | |
846 | * linux network subsystems | |
847 | */ | |
848 | len = skb->len; | |
849 | ||
850 | /* skb->len is the FULL length of data (including fragmentary portion) | |
851 | * skb->data_len is the length of the fragment portion in frags | |
852 | * skb->len - skb->data_len is size of the 1st fragment in skb->data | |
853 | * calculate the length of the first fragment that skb->data is | |
854 | * pointing to | |
855 | */ | |
856 | firstfraglen = skb->len - skb->data_len; | |
857 | if (firstfraglen < ETH_HEADER_SIZE) { | |
858 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
859 | devdata->busy_cnt++; | |
00748b0c TS |
860 | dev_err(&netdev->dev, |
861 | "%s busy - first frag too small (%d)\n", | |
862 | __func__, firstfraglen); | |
f6346ad6 NH |
863 | kfree_skb(skb); |
864 | return NETDEV_TX_OK; | |
68905a14 DK |
865 | } |
866 | ||
867 | if ((len < ETH_MIN_PACKET_SIZE) && | |
868 | ((skb_end_pointer(skb) - skb->data) >= ETH_MIN_PACKET_SIZE)) { | |
869 | /* pad the packet out to minimum size */ | |
870 | padlen = ETH_MIN_PACKET_SIZE - len; | |
871 | memset(&skb->data[len], 0, padlen); | |
872 | skb->tail += padlen; | |
873 | skb->len += padlen; | |
874 | len += padlen; | |
875 | firstfraglen += padlen; | |
876 | } | |
877 | ||
878 | cmdrsp = devdata->xmit_cmdrsp; | |
879 | /* clear cmdrsp */ | |
880 | memset(cmdrsp, 0, SIZEOF_CMDRSP); | |
881 | cmdrsp->net.type = NET_XMIT; | |
882 | cmdrsp->cmdtype = CMD_NET_TYPE; | |
883 | ||
884 | /* save the pointer to skb -- we'll need it for completion */ | |
885 | cmdrsp->net.buf = skb; | |
886 | ||
36927c18 TS |
887 | if (vnic_hit_high_watermark(devdata, |
888 | devdata->max_outstanding_net_xmits)) { | |
68905a14 DK |
889 | /* too many NET_XMITs queued over to IOVM - need to wait |
890 | */ | |
891 | devdata->chstat.reject_count++; | |
892 | if (!devdata->queuefullmsg_logged && | |
893 | ((devdata->chstat.reject_count & 0x3ff) == 1)) | |
894 | devdata->queuefullmsg_logged = 1; | |
895 | netif_stop_queue(netdev); | |
896 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
897 | devdata->busy_cnt++; | |
00748b0c TS |
898 | dev_dbg(&netdev->dev, |
899 | "%s busy - waiting for iovm to catch up\n", | |
900 | __func__); | |
f6346ad6 NH |
901 | kfree_skb(skb); |
902 | return NETDEV_TX_OK; | |
68905a14 DK |
903 | } |
904 | if (devdata->queuefullmsg_logged) | |
905 | devdata->queuefullmsg_logged = 0; | |
906 | ||
907 | if (skb->ip_summed == CHECKSUM_UNNECESSARY) { | |
908 | cmdrsp->net.xmt.lincsum.valid = 1; | |
909 | cmdrsp->net.xmt.lincsum.protocol = skb->protocol; | |
910 | if (skb_transport_header(skb) > skb->data) { | |
911 | cmdrsp->net.xmt.lincsum.hrawoff = | |
912 | skb_transport_header(skb) - skb->data; | |
913 | cmdrsp->net.xmt.lincsum.hrawoff = 1; | |
914 | } | |
915 | if (skb_network_header(skb) > skb->data) { | |
916 | cmdrsp->net.xmt.lincsum.nhrawoff = | |
917 | skb_network_header(skb) - skb->data; | |
918 | cmdrsp->net.xmt.lincsum.nhrawoffv = 1; | |
919 | } | |
920 | cmdrsp->net.xmt.lincsum.csum = skb->csum; | |
921 | } else { | |
922 | cmdrsp->net.xmt.lincsum.valid = 0; | |
923 | } | |
924 | ||
925 | /* save off the length of the entire data packet */ | |
926 | cmdrsp->net.xmt.len = len; | |
927 | ||
928 | /* copy ethernet header from first frag into ocmdrsp | |
929 | * - everything else will be pass in frags & DMA'ed | |
930 | */ | |
931 | memcpy(cmdrsp->net.xmt.ethhdr, skb->data, ETH_HEADER_SIZE); | |
932 | /* copy frags info - from skb->data we need to only provide access | |
933 | * beyond eth header | |
934 | */ | |
935 | cmdrsp->net.xmt.num_frags = | |
936 | visor_copy_fragsinfo_from_skb(skb, firstfraglen, | |
937 | MAX_PHYS_INFO, | |
938 | cmdrsp->net.xmt.frags); | |
ce657aa8 | 939 | if (cmdrsp->net.xmt.num_frags < 0) { |
68905a14 DK |
940 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
941 | devdata->busy_cnt++; | |
00748b0c TS |
942 | dev_err(&netdev->dev, |
943 | "%s busy - copy frags failed\n", __func__); | |
f6346ad6 NH |
944 | kfree_skb(skb); |
945 | return NETDEV_TX_OK; | |
68905a14 DK |
946 | } |
947 | ||
948 | if (!visorchannel_signalinsert(devdata->dev->visorchannel, | |
949 | IOCHAN_TO_IOPART, cmdrsp)) { | |
950 | netif_stop_queue(netdev); | |
951 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
952 | devdata->busy_cnt++; | |
00748b0c TS |
953 | dev_dbg(&netdev->dev, |
954 | "%s busy - signalinsert failed\n", __func__); | |
f6346ad6 NH |
955 | kfree_skb(skb); |
956 | return NETDEV_TX_OK; | |
68905a14 DK |
957 | } |
958 | ||
959 | /* Track the skbs that have been sent to the IOVM for XMIT */ | |
960 | skb_queue_head(&devdata->xmitbufhead, skb); | |
961 | ||
68905a14 DK |
962 | /* update xmt stats */ |
963 | devdata->net_stats.tx_packets++; | |
964 | devdata->net_stats.tx_bytes += skb->len; | |
965 | devdata->chstat.sent_xmit++; | |
966 | ||
967 | /* check to see if we have hit the high watermark for | |
968 | * netif_stop_queue() | |
969 | */ | |
36927c18 TS |
970 | if (vnic_hit_high_watermark(devdata, |
971 | devdata->upper_threshold_net_xmits)) { | |
68905a14 DK |
972 | /* too many NET_XMITs queued over to IOVM - need to wait */ |
973 | netif_stop_queue(netdev); /* calling stop queue - call | |
974 | * netif_wake_queue() after lower | |
975 | * threshold | |
976 | */ | |
00748b0c TS |
977 | dev_dbg(&netdev->dev, |
978 | "%s busy - invoking iovm flow control\n", | |
979 | __func__); | |
68905a14 DK |
980 | devdata->flow_control_upper_hits++; |
981 | } | |
982 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
983 | ||
984 | /* skb will be freed when we get back NET_XMIT_DONE */ | |
985 | return NETDEV_TX_OK; | |
986 | } | |
987 | ||
988 | /** | |
989 | * visornic_get_stats - returns net_stats of the visornic device | |
990 | * @netdev: netdevice | |
991 | * | |
992 | * Returns the net_device_stats for the device | |
993 | */ | |
994 | static struct net_device_stats * | |
995 | visornic_get_stats(struct net_device *netdev) | |
996 | { | |
997 | struct visornic_devdata *devdata = netdev_priv(netdev); | |
998 | ||
999 | return &devdata->net_stats; | |
1000 | } | |
1001 | ||
68905a14 DK |
1002 | /** |
1003 | * visornic_change_mtu - changes mtu of device. | |
1004 | * @netdev: netdevice | |
1005 | * @new_mtu: value of new mtu | |
1006 | * | |
1007 | * MTU cannot be changed by system, must be changed via | |
1008 | * CONTROLVM message. All vnics and pnics in a switch have | |
1009 | * to have the same MTU for everything to work. | |
1010 | * Currently not supported. | |
1011 | * Returns EINVAL | |
1012 | */ | |
1013 | static int | |
1014 | visornic_change_mtu(struct net_device *netdev, int new_mtu) | |
1015 | { | |
1016 | return -EINVAL; | |
1017 | } | |
1018 | ||
1019 | /** | |
1020 | * visornic_set_multi - changes mtu of device. | |
1021 | * @netdev: netdevice | |
1022 | * | |
1023 | * Only flag we support currently is IFF_PROMISC | |
1024 | * Returns void | |
1025 | */ | |
1026 | static void | |
1027 | visornic_set_multi(struct net_device *netdev) | |
1028 | { | |
1029 | struct uiscmdrsp *cmdrsp; | |
1030 | struct visornic_devdata *devdata = netdev_priv(netdev); | |
1031 | ||
1032 | /* any filtering changes */ | |
1033 | if (devdata->old_flags != netdev->flags) { | |
1034 | if ((netdev->flags & IFF_PROMISC) != | |
1035 | (devdata->old_flags & IFF_PROMISC)) { | |
1036 | cmdrsp = kmalloc(SIZEOF_CMDRSP, GFP_ATOMIC); | |
1037 | if (!cmdrsp) | |
1038 | return; | |
1039 | cmdrsp->cmdtype = CMD_NET_TYPE; | |
1040 | cmdrsp->net.type = NET_RCV_PROMISC; | |
1041 | cmdrsp->net.enbdis.context = netdev; | |
1042 | cmdrsp->net.enbdis.enable = | |
1043 | (netdev->flags & IFF_PROMISC); | |
1044 | visorchannel_signalinsert(devdata->dev->visorchannel, | |
1045 | IOCHAN_TO_IOPART, | |
1046 | cmdrsp); | |
1047 | kfree(cmdrsp); | |
1048 | } | |
1049 | devdata->old_flags = netdev->flags; | |
1050 | } | |
1051 | } | |
1052 | ||
1053 | /** | |
1054 | * visornic_xmit_timeout - request to timeout the xmit | |
1055 | * @netdev | |
1056 | * | |
1057 | * Queue the work and return. Make sure we have not already | |
1058 | * been informed the IO Partition is gone, if it is gone | |
1059 | * we will already timeout the xmits. | |
1060 | */ | |
1061 | static void | |
1062 | visornic_xmit_timeout(struct net_device *netdev) | |
1063 | { | |
1064 | struct visornic_devdata *devdata = netdev_priv(netdev); | |
1065 | unsigned long flags; | |
1066 | ||
1067 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
46df8226 TS |
1068 | if (devdata->going_away) { |
1069 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1070 | dev_dbg(&devdata->dev->device, | |
1071 | "%s aborting because device removal pending\n", | |
1072 | __func__); | |
1073 | return; | |
1074 | } | |
1075 | ||
68905a14 DK |
1076 | /* Ensure that a ServerDown message hasn't been received */ |
1077 | if (!devdata->enabled || | |
1078 | (devdata->server_down && !devdata->server_change_state)) { | |
00748b0c TS |
1079 | dev_dbg(&netdev->dev, "%s no processing\n", |
1080 | __func__); | |
68905a14 DK |
1081 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
1082 | return; | |
1083 | } | |
68905a14 | 1084 | queue_work(visornic_timeout_reset_workqueue, &devdata->timeout_reset); |
46df8226 | 1085 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
68905a14 DK |
1086 | } |
1087 | ||
1088 | /** | |
1089 | * repost_return - repost rcv bufs that have come back | |
1090 | * @cmdrsp: io channel command struct to post | |
1091 | * @devdata: visornic devdata for the device | |
1092 | * @skb: skb | |
1093 | * @netdev: netdevice | |
1094 | * | |
1095 | * Repost rcv buffers that have been returned to us when | |
1096 | * we are finished with them. | |
1097 | * Returns 0 for success, -1 for error. | |
1098 | */ | |
1099 | static inline int | |
1100 | repost_return(struct uiscmdrsp *cmdrsp, struct visornic_devdata *devdata, | |
1101 | struct sk_buff *skb, struct net_device *netdev) | |
1102 | { | |
1103 | struct net_pkt_rcv copy; | |
1104 | int i = 0, cc, numreposted; | |
1105 | int found_skb = 0; | |
1106 | int status = 0; | |
1107 | ||
1108 | copy = cmdrsp->net.rcv; | |
1109 | switch (copy.numrcvbufs) { | |
1110 | case 0: | |
1111 | devdata->n_rcv0++; | |
1112 | break; | |
1113 | case 1: | |
1114 | devdata->n_rcv1++; | |
1115 | break; | |
1116 | case 2: | |
1117 | devdata->n_rcv2++; | |
1118 | break; | |
1119 | default: | |
1120 | devdata->n_rcvx++; | |
1121 | break; | |
1122 | } | |
1123 | for (cc = 0, numreposted = 0; cc < copy.numrcvbufs; cc++) { | |
1124 | for (i = 0; i < devdata->num_rcv_bufs; i++) { | |
1125 | if (devdata->rcvbuf[i] != copy.rcvbuf[cc]) | |
1126 | continue; | |
1127 | ||
1128 | if ((skb) && devdata->rcvbuf[i] == skb) { | |
1129 | devdata->found_repost_rcvbuf_cnt++; | |
1130 | found_skb = 1; | |
1131 | devdata->repost_found_skb_cnt++; | |
1132 | } | |
1133 | devdata->rcvbuf[i] = alloc_rcv_buf(netdev); | |
1134 | if (!devdata->rcvbuf[i]) { | |
1135 | devdata->num_rcv_bufs_could_not_alloc++; | |
1136 | devdata->alloc_failed_in_repost_rtn_cnt++; | |
1137 | status = -ENOMEM; | |
1138 | break; | |
1139 | } | |
1140 | post_skb(cmdrsp, devdata, devdata->rcvbuf[i]); | |
1141 | numreposted++; | |
1142 | break; | |
1143 | } | |
1144 | } | |
1145 | if (numreposted != copy.numrcvbufs) { | |
1146 | devdata->n_repost_deficit++; | |
1147 | status = -EINVAL; | |
1148 | } | |
1149 | if (skb) { | |
1150 | if (found_skb) { | |
1151 | kfree_skb(skb); | |
1152 | } else { | |
1153 | status = -EINVAL; | |
1154 | devdata->bad_rcv_buf++; | |
1155 | } | |
1156 | } | |
68905a14 DK |
1157 | return status; |
1158 | } | |
1159 | ||
1160 | /** | |
1161 | * visornic_rx - Handle receive packets coming back from IO Part | |
1162 | * @cmdrsp: Receive packet returned from IO Part | |
1163 | * | |
1164 | * Got a receive packet back from the IO Part, handle it and send | |
1165 | * it up the stack. | |
1166 | * Returns void | |
1167 | */ | |
946b2546 | 1168 | static int |
68905a14 DK |
1169 | visornic_rx(struct uiscmdrsp *cmdrsp) |
1170 | { | |
1171 | struct visornic_devdata *devdata; | |
1172 | struct sk_buff *skb, *prev, *curr; | |
1173 | struct net_device *netdev; | |
946b2546 | 1174 | int cc, currsize, off; |
68905a14 DK |
1175 | struct ethhdr *eth; |
1176 | unsigned long flags; | |
946b2546 | 1177 | int rx_count = 0; |
68905a14 DK |
1178 | |
1179 | /* post new rcv buf to the other end using the cmdrsp we have at hand | |
1180 | * post it without holding lock - but we'll use the signal lock to | |
1181 | * synchronize the queue insert the cmdrsp that contains the net.rcv | |
1182 | * is the one we are using to repost, so copy the info we need from it. | |
1183 | */ | |
1184 | skb = cmdrsp->net.buf; | |
1185 | netdev = skb->dev; | |
1186 | ||
68905a14 DK |
1187 | devdata = netdev_priv(netdev); |
1188 | ||
1189 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
1190 | atomic_dec(&devdata->num_rcvbuf_in_iovm); | |
1191 | ||
68905a14 DK |
1192 | /* set length to how much was ACTUALLY received - |
1193 | * NOTE: rcv_done_len includes actual length of data rcvd | |
1194 | * including ethhdr | |
1195 | */ | |
1196 | skb->len = cmdrsp->net.rcv.rcv_done_len; | |
1197 | ||
f6b6a8ec DK |
1198 | /* update rcv stats - call it with priv_lock held */ |
1199 | devdata->net_stats.rx_packets++; | |
1200 | devdata->net_stats.rx_bytes += skb->len; | |
1201 | ||
68905a14 DK |
1202 | /* test enabled while holding lock */ |
1203 | if (!(devdata->enabled && devdata->enab_dis_acked)) { | |
1204 | /* don't process it unless we're in enable mode and until | |
1205 | * we've gotten an ACK saying the other end got our RCV enable | |
1206 | */ | |
1207 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1208 | repost_return(cmdrsp, devdata, skb, netdev); | |
946b2546 | 1209 | return rx_count; |
68905a14 DK |
1210 | } |
1211 | ||
1212 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1213 | ||
1214 | /* when skb was allocated, skb->dev, skb->data, skb->len and | |
1215 | * skb->data_len were setup. AND, data has already put into the | |
1216 | * skb (both first frag and in frags pages) | |
1217 | * NOTE: firstfragslen is the amount of data in skb->data and that | |
1218 | * which is not in nr_frags or frag_list. This is now simply | |
1219 | * RCVPOST_BUF_SIZE. bump tail to show how much data is in | |
1220 | * firstfrag & set data_len to show rest see if we have to chain | |
1221 | * frag_list. | |
1222 | */ | |
1223 | if (skb->len > RCVPOST_BUF_SIZE) { /* do PRECAUTIONARY check */ | |
1224 | if (cmdrsp->net.rcv.numrcvbufs < 2) { | |
1225 | if (repost_return(cmdrsp, devdata, skb, netdev) < 0) | |
1226 | dev_err(&devdata->netdev->dev, | |
1227 | "repost_return failed"); | |
946b2546 | 1228 | return rx_count; |
68905a14 DK |
1229 | } |
1230 | /* length rcvd is greater than firstfrag in this skb rcv buf */ | |
1231 | skb->tail += RCVPOST_BUF_SIZE; /* amount in skb->data */ | |
1232 | skb->data_len = skb->len - RCVPOST_BUF_SIZE; /* amount that | |
1233 | will be in | |
1234 | frag_list */ | |
1235 | } else { | |
1236 | /* data fits in this skb - no chaining - do | |
1237 | * PRECAUTIONARY check | |
1238 | */ | |
1239 | if (cmdrsp->net.rcv.numrcvbufs != 1) { /* should be 1 */ | |
1240 | if (repost_return(cmdrsp, devdata, skb, netdev) < 0) | |
1241 | dev_err(&devdata->netdev->dev, | |
1242 | "repost_return failed"); | |
946b2546 | 1243 | return rx_count; |
68905a14 DK |
1244 | } |
1245 | skb->tail += skb->len; | |
1246 | skb->data_len = 0; /* nothing rcvd in frag_list */ | |
1247 | } | |
1248 | off = skb_tail_pointer(skb) - skb->data; | |
1249 | ||
1250 | /* amount we bumped tail by in the head skb | |
1251 | * it is used to calculate the size of each chained skb below | |
1252 | * it is also used to index into bufline to continue the copy | |
1253 | * (for chansocktwopc) | |
1254 | * if necessary chain the rcv skbs together. | |
1255 | * NOTE: index 0 has the same as cmdrsp->net.rcv.skb; we need to | |
1256 | * chain the rest to that one. | |
1257 | * - do PRECAUTIONARY check | |
1258 | */ | |
1259 | if (cmdrsp->net.rcv.rcvbuf[0] != skb) { | |
1260 | if (repost_return(cmdrsp, devdata, skb, netdev) < 0) | |
1261 | dev_err(&devdata->netdev->dev, "repost_return failed"); | |
946b2546 | 1262 | return rx_count; |
68905a14 DK |
1263 | } |
1264 | ||
1265 | if (cmdrsp->net.rcv.numrcvbufs > 1) { | |
1266 | /* chain the various rcv buffers into the skb's frag_list. */ | |
1267 | /* Note: off was initialized above */ | |
1268 | for (cc = 1, prev = NULL; | |
1269 | cc < cmdrsp->net.rcv.numrcvbufs; cc++) { | |
1270 | curr = (struct sk_buff *)cmdrsp->net.rcv.rcvbuf[cc]; | |
1271 | curr->next = NULL; | |
1272 | if (!prev) /* start of list- set head */ | |
1273 | skb_shinfo(skb)->frag_list = curr; | |
1274 | else | |
1275 | prev->next = curr; | |
1276 | prev = curr; | |
1277 | ||
1278 | /* should we set skb->len and skb->data_len for each | |
1279 | * buffer being chained??? can't hurt! | |
1280 | */ | |
1281 | currsize = min(skb->len - off, | |
1282 | (unsigned int)RCVPOST_BUF_SIZE); | |
1283 | curr->len = currsize; | |
1284 | curr->tail += currsize; | |
1285 | curr->data_len = 0; | |
1286 | off += currsize; | |
1287 | } | |
68905a14 DK |
1288 | /* assert skb->len == off */ |
1289 | if (skb->len != off) { | |
cb84fca0 TS |
1290 | netdev_err(devdata->netdev, |
1291 | "something wrong; skb->len:%d != off:%d\n", | |
1292 | skb->len, off); | |
68905a14 | 1293 | } |
68905a14 DK |
1294 | } |
1295 | ||
1296 | /* set up packet's protocl type using ethernet header - this | |
1297 | * sets up skb->pkt_type & it also PULLS out the eth header | |
1298 | */ | |
1299 | skb->protocol = eth_type_trans(skb, netdev); | |
1300 | ||
1301 | eth = eth_hdr(skb); | |
1302 | ||
1303 | skb->csum = 0; | |
1304 | skb->ip_summed = CHECKSUM_NONE; | |
1305 | ||
1306 | do { | |
1307 | if (netdev->flags & IFF_PROMISC) | |
1308 | break; /* accept all packets */ | |
1309 | if (skb->pkt_type == PACKET_BROADCAST) { | |
1310 | if (netdev->flags & IFF_BROADCAST) | |
1311 | break; /* accept all broadcast packets */ | |
1312 | } else if (skb->pkt_type == PACKET_MULTICAST) { | |
1313 | if ((netdev->flags & IFF_MULTICAST) && | |
1314 | (netdev_mc_count(netdev))) { | |
1315 | struct netdev_hw_addr *ha; | |
1316 | int found_mc = 0; | |
1317 | ||
1318 | /* only accept multicast packets that we can | |
1319 | * find in our multicast address list | |
1320 | */ | |
1321 | netdev_for_each_mc_addr(ha, netdev) { | |
1322 | if (ether_addr_equal(eth->h_dest, | |
1323 | ha->addr)) { | |
1324 | found_mc = 1; | |
1325 | break; | |
1326 | } | |
1327 | } | |
1328 | if (found_mc) | |
1329 | break; /* accept packet, dest | |
1330 | matches a multicast | |
1331 | address */ | |
1332 | } | |
1333 | } else if (skb->pkt_type == PACKET_HOST) { | |
1334 | break; /* accept packet, h_dest must match vnic | |
1335 | mac address */ | |
1336 | } else if (skb->pkt_type == PACKET_OTHERHOST) { | |
1337 | /* something is not right */ | |
1338 | dev_err(&devdata->netdev->dev, | |
1339 | "**** FAILED to deliver rcv packet to OS; name:%s Dest:%pM VNIC:%pM\n", | |
1340 | netdev->name, eth->h_dest, netdev->dev_addr); | |
1341 | } | |
1342 | /* drop packet - don't forward it up to OS */ | |
1343 | devdata->n_rcv_packets_not_accepted++; | |
1344 | repost_return(cmdrsp, devdata, skb, netdev); | |
946b2546 | 1345 | return rx_count; |
68905a14 DK |
1346 | } while (0); |
1347 | ||
946b2546 NH |
1348 | rx_count++; |
1349 | netif_receive_skb(skb); | |
68905a14 DK |
1350 | /* netif_rx returns various values, but "in practice most drivers |
1351 | * ignore the return value | |
1352 | */ | |
1353 | ||
1354 | skb = NULL; | |
1355 | /* | |
1356 | * whether the packet got dropped or handled, the skb is freed by | |
1357 | * kernel code, so we shouldn't free it. but we should repost a | |
1358 | * new rcv buffer. | |
1359 | */ | |
1360 | repost_return(cmdrsp, devdata, skb, netdev); | |
946b2546 | 1361 | return rx_count; |
68905a14 DK |
1362 | } |
1363 | ||
1364 | /** | |
1365 | * devdata_initialize - Initialize devdata structure | |
1366 | * @devdata: visornic_devdata structure to initialize | |
1367 | * #dev: visorbus_deviced it belongs to | |
1368 | * | |
1369 | * Setup initial values for the visornic based on channel and default | |
1370 | * values. | |
1371 | * Returns a pointer to the devdata if successful, else NULL | |
1372 | */ | |
1373 | static struct visornic_devdata * | |
1374 | devdata_initialize(struct visornic_devdata *devdata, struct visor_device *dev) | |
1375 | { | |
1376 | int devnum = -1; | |
1377 | ||
1378 | if (!devdata) | |
1379 | return NULL; | |
1380 | memset(devdata, '\0', sizeof(struct visornic_devdata)); | |
1381 | spin_lock(&dev_num_pool_lock); | |
1382 | devnum = find_first_zero_bit(dev_num_pool, MAXDEVICES); | |
1383 | set_bit(devnum, dev_num_pool); | |
1384 | spin_unlock(&dev_num_pool_lock); | |
1385 | if (devnum == MAXDEVICES) | |
1386 | devnum = -1; | |
8d0119d8 | 1387 | if (devnum < 0) |
68905a14 | 1388 | return NULL; |
68905a14 DK |
1389 | devdata->devnum = devnum; |
1390 | devdata->dev = dev; | |
1391 | strncpy(devdata->name, dev_name(&dev->device), sizeof(devdata->name)); | |
68905a14 DK |
1392 | spin_lock(&lock_all_devices); |
1393 | list_add_tail(&devdata->list_all, &list_all_devices); | |
1394 | spin_unlock(&lock_all_devices); | |
1395 | return devdata; | |
1396 | } | |
1397 | ||
1398 | /** | |
8d0119d8 TS |
1399 | * devdata_release - Frees up references in devdata |
1400 | * @devdata: struct to clean up | |
68905a14 | 1401 | * |
8d0119d8 | 1402 | * Frees up references in devdata. |
68905a14 DK |
1403 | * Returns void |
1404 | */ | |
8d0119d8 | 1405 | static void devdata_release(struct visornic_devdata *devdata) |
68905a14 | 1406 | { |
68905a14 DK |
1407 | spin_lock(&dev_num_pool_lock); |
1408 | clear_bit(devdata->devnum, dev_num_pool); | |
1409 | spin_unlock(&dev_num_pool_lock); | |
1410 | spin_lock(&lock_all_devices); | |
1411 | list_del(&devdata->list_all); | |
1412 | spin_unlock(&lock_all_devices); | |
46df8226 TS |
1413 | kfree(devdata->rcvbuf); |
1414 | kfree(devdata->cmdrsp_rcv); | |
1415 | kfree(devdata->xmit_cmdrsp); | |
68905a14 DK |
1416 | } |
1417 | ||
1418 | static const struct net_device_ops visornic_dev_ops = { | |
1419 | .ndo_open = visornic_open, | |
1420 | .ndo_stop = visornic_close, | |
1421 | .ndo_start_xmit = visornic_xmit, | |
1422 | .ndo_get_stats = visornic_get_stats, | |
68905a14 DK |
1423 | .ndo_change_mtu = visornic_change_mtu, |
1424 | .ndo_tx_timeout = visornic_xmit_timeout, | |
1425 | .ndo_set_rx_mode = visornic_set_multi, | |
1426 | }; | |
1427 | ||
52b1660d NH |
1428 | /* DebugFS code */ |
1429 | static ssize_t info_debugfs_read(struct file *file, char __user *buf, | |
1430 | size_t len, loff_t *offset) | |
1431 | { | |
1432 | ssize_t bytes_read = 0; | |
1433 | int str_pos = 0; | |
1434 | struct visornic_devdata *devdata; | |
1435 | struct net_device *dev; | |
1436 | char *vbuf; | |
1437 | ||
1438 | if (len > MAX_BUF) | |
1439 | len = MAX_BUF; | |
1440 | vbuf = kzalloc(len, GFP_KERNEL); | |
1441 | if (!vbuf) | |
1442 | return -ENOMEM; | |
1443 | ||
1444 | /* for each vnic channel | |
1445 | * dump out channel specific data | |
1446 | */ | |
1447 | rcu_read_lock(); | |
1448 | for_each_netdev_rcu(current->nsproxy->net_ns, dev) { | |
1449 | /* | |
1450 | * Only consider netdevs that are visornic, and are open | |
1451 | */ | |
1452 | if ((dev->netdev_ops != &visornic_dev_ops) || | |
1453 | (!netif_queue_stopped(dev))) | |
1454 | continue; | |
1455 | ||
1456 | devdata = netdev_priv(dev); | |
1457 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1458 | "netdev = %s (0x%p), MAC Addr %pM\n", | |
1459 | dev->name, | |
1460 | dev, | |
1461 | dev->dev_addr); | |
1462 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1463 | "VisorNic Dev Info = 0x%p\n", devdata); | |
1464 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1465 | " num_rcv_bufs = %d\n", | |
1466 | devdata->num_rcv_bufs); | |
1467 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
36927c18 | 1468 | " max_oustanding_next_xmits = %lu\n", |
52b1660d NH |
1469 | devdata->max_outstanding_net_xmits); |
1470 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
36927c18 | 1471 | " upper_threshold_net_xmits = %lu\n", |
52b1660d NH |
1472 | devdata->upper_threshold_net_xmits); |
1473 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
36927c18 | 1474 | " lower_threshold_net_xmits = %lu\n", |
52b1660d NH |
1475 | devdata->lower_threshold_net_xmits); |
1476 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1477 | " queuefullmsg_logged = %d\n", | |
1478 | devdata->queuefullmsg_logged); | |
1479 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1480 | " chstat.got_rcv = %lu\n", | |
1481 | devdata->chstat.got_rcv); | |
1482 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1483 | " chstat.got_enbdisack = %lu\n", | |
1484 | devdata->chstat.got_enbdisack); | |
1485 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1486 | " chstat.got_xmit_done = %lu\n", | |
1487 | devdata->chstat.got_xmit_done); | |
1488 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1489 | " chstat.xmit_fail = %lu\n", | |
1490 | devdata->chstat.xmit_fail); | |
1491 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1492 | " chstat.sent_enbdis = %lu\n", | |
1493 | devdata->chstat.sent_enbdis); | |
1494 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1495 | " chstat.sent_promisc = %lu\n", | |
1496 | devdata->chstat.sent_promisc); | |
1497 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1498 | " chstat.sent_post = %lu\n", | |
1499 | devdata->chstat.sent_post); | |
81d275c6 TS |
1500 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, |
1501 | " chstat.sent_post_failed = %lu\n", | |
1502 | devdata->chstat.sent_post_failed); | |
52b1660d NH |
1503 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, |
1504 | " chstat.sent_xmit = %lu\n", | |
1505 | devdata->chstat.sent_xmit); | |
1506 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1507 | " chstat.reject_count = %lu\n", | |
1508 | devdata->chstat.reject_count); | |
1509 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1510 | " chstat.extra_rcvbufs_sent = %lu\n", | |
1511 | devdata->chstat.extra_rcvbufs_sent); | |
1512 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1513 | " n_rcv0 = %lu\n", devdata->n_rcv0); | |
1514 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1515 | " n_rcv1 = %lu\n", devdata->n_rcv1); | |
1516 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1517 | " n_rcv2 = %lu\n", devdata->n_rcv2); | |
1518 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1519 | " n_rcvx = %lu\n", devdata->n_rcvx); | |
1520 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1521 | " num_rcvbuf_in_iovm = %d\n", | |
1522 | atomic_read(&devdata->num_rcvbuf_in_iovm)); | |
1523 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1524 | " alloc_failed_in_if_needed_cnt = %lu\n", | |
1525 | devdata->alloc_failed_in_if_needed_cnt); | |
1526 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1527 | " alloc_failed_in_repost_rtn_cnt = %lu\n", | |
1528 | devdata->alloc_failed_in_repost_rtn_cnt); | |
1529 | /* str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1530 | * " inner_loop_limit_reached_cnt = %lu\n", | |
1531 | * devdata->inner_loop_limit_reached_cnt); | |
1532 | */ | |
1533 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1534 | " found_repost_rcvbuf_cnt = %lu\n", | |
1535 | devdata->found_repost_rcvbuf_cnt); | |
1536 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1537 | " repost_found_skb_cnt = %lu\n", | |
1538 | devdata->repost_found_skb_cnt); | |
1539 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1540 | " n_repost_deficit = %lu\n", | |
1541 | devdata->n_repost_deficit); | |
1542 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1543 | " bad_rcv_buf = %lu\n", | |
1544 | devdata->bad_rcv_buf); | |
1545 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1546 | " n_rcv_packets_not_accepted = %lu\n", | |
1547 | devdata->n_rcv_packets_not_accepted); | |
1548 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1549 | " interrupts_rcvd = %llu\n", | |
1550 | devdata->interrupts_rcvd); | |
1551 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1552 | " interrupts_notme = %llu\n", | |
1553 | devdata->interrupts_notme); | |
1554 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1555 | " interrupts_disabled = %llu\n", | |
1556 | devdata->interrupts_disabled); | |
1557 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1558 | " busy_cnt = %llu\n", | |
1559 | devdata->busy_cnt); | |
1560 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1561 | " flow_control_upper_hits = %llu\n", | |
1562 | devdata->flow_control_upper_hits); | |
1563 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1564 | " flow_control_lower_hits = %llu\n", | |
1565 | devdata->flow_control_lower_hits); | |
52b1660d NH |
1566 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, |
1567 | " netif_queue = %s\n", | |
1568 | netif_queue_stopped(devdata->netdev) ? | |
1569 | "stopped" : "running"); | |
36927c18 TS |
1570 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, |
1571 | " xmits_outstanding = %lu\n", | |
1572 | devdata_xmits_outstanding(devdata)); | |
52b1660d NH |
1573 | } |
1574 | rcu_read_unlock(); | |
1575 | bytes_read = simple_read_from_buffer(buf, len, offset, vbuf, str_pos); | |
1576 | kfree(vbuf); | |
1577 | return bytes_read; | |
1578 | } | |
1579 | ||
68905a14 DK |
1580 | /** |
1581 | * send_rcv_posts_if_needed | |
1582 | * @devdata: visornic device | |
1583 | * | |
1584 | * Send receive buffers to the IO Partition. | |
1585 | * Returns void | |
1586 | */ | |
1587 | static void | |
1588 | send_rcv_posts_if_needed(struct visornic_devdata *devdata) | |
1589 | { | |
1590 | int i; | |
1591 | struct net_device *netdev; | |
1592 | struct uiscmdrsp *cmdrsp = devdata->cmdrsp_rcv; | |
1593 | int cur_num_rcv_bufs_to_alloc, rcv_bufs_allocated; | |
1594 | ||
1595 | /* don't do this until vnic is marked ready */ | |
1596 | if (!(devdata->enabled && devdata->enab_dis_acked)) | |
1597 | return; | |
1598 | ||
1599 | netdev = devdata->netdev; | |
1600 | rcv_bufs_allocated = 0; | |
1601 | /* this code is trying to prevent getting stuck here forever, | |
1602 | * but still retry it if you cant allocate them all this time. | |
1603 | */ | |
1604 | cur_num_rcv_bufs_to_alloc = devdata->num_rcv_bufs_could_not_alloc; | |
1605 | while (cur_num_rcv_bufs_to_alloc > 0) { | |
1606 | cur_num_rcv_bufs_to_alloc--; | |
1607 | for (i = 0; i < devdata->num_rcv_bufs; i++) { | |
1608 | if (devdata->rcvbuf[i]) | |
1609 | continue; | |
1610 | devdata->rcvbuf[i] = alloc_rcv_buf(netdev); | |
1611 | if (!devdata->rcvbuf[i]) { | |
1612 | devdata->alloc_failed_in_if_needed_cnt++; | |
1613 | break; | |
1614 | } | |
1615 | rcv_bufs_allocated++; | |
1616 | post_skb(cmdrsp, devdata, devdata->rcvbuf[i]); | |
1617 | devdata->chstat.extra_rcvbufs_sent++; | |
1618 | } | |
1619 | } | |
1620 | devdata->num_rcv_bufs_could_not_alloc -= rcv_bufs_allocated; | |
1621 | } | |
1622 | ||
1623 | /** | |
1624 | * draing_queue - drains the response queue | |
1625 | * @cmdrsp: io channel command response message | |
1626 | * @devdata: visornic device to drain | |
1627 | * | |
1628 | * Drain the respones queue of any responses from the IO partition. | |
1629 | * Process the responses as we get them. | |
1630 | * Returns when response queue is empty or when the threadd stops. | |
1631 | */ | |
1632 | static void | |
946b2546 NH |
1633 | service_resp_queue(struct uiscmdrsp *cmdrsp, struct visornic_devdata *devdata, |
1634 | int *rx_work_done) | |
68905a14 DK |
1635 | { |
1636 | unsigned long flags; | |
1637 | struct net_device *netdev; | |
1638 | ||
87a9404e NH |
1639 | /* TODO: CLIENT ACQUIRE -- Don't really need this at the |
1640 | * moment */ | |
7c03621a DK |
1641 | for (;;) { |
1642 | if (!visorchannel_signalremove(devdata->dev->visorchannel, | |
1643 | IOCHAN_FROM_IOPART, | |
1644 | cmdrsp)) | |
1645 | break; /* queue empty */ | |
1646 | ||
1647 | switch (cmdrsp->net.type) { | |
1648 | case NET_RCV: | |
1649 | devdata->chstat.got_rcv++; | |
1650 | /* process incoming packet */ | |
946b2546 | 1651 | *rx_work_done += visornic_rx(cmdrsp); |
7c03621a DK |
1652 | break; |
1653 | case NET_XMIT_DONE: | |
1654 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
1655 | devdata->chstat.got_xmit_done++; | |
1656 | if (cmdrsp->net.xmtdone.xmt_done_result) | |
1657 | devdata->chstat.xmit_fail++; | |
1658 | /* only call queue wake if we stopped it */ | |
1659 | netdev = ((struct sk_buff *)cmdrsp->net.buf)->dev; | |
1660 | /* ASSERT netdev == vnicinfo->netdev; */ | |
1661 | if ((netdev == devdata->netdev) && | |
1662 | netif_queue_stopped(netdev)) { | |
1663 | /* check to see if we have crossed | |
1664 | * the lower watermark for | |
1665 | * netif_wake_queue() | |
68905a14 | 1666 | */ |
36927c18 TS |
1667 | if (vnic_hit_low_watermark(devdata, |
1668 | devdata->lower_threshold_net_xmits)) { | |
7c03621a DK |
1669 | /* enough NET_XMITs completed |
1670 | * so can restart netif queue | |
1671 | */ | |
1672 | netif_wake_queue(netdev); | |
1673 | devdata->flow_control_lower_hits++; | |
1674 | } | |
68905a14 | 1675 | } |
7c03621a DK |
1676 | skb_unlink(cmdrsp->net.buf, &devdata->xmitbufhead); |
1677 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1678 | kfree_skb(cmdrsp->net.buf); | |
68905a14 | 1679 | break; |
7c03621a DK |
1680 | case NET_RCV_ENBDIS_ACK: |
1681 | devdata->chstat.got_enbdisack++; | |
1682 | netdev = (struct net_device *) | |
1683 | cmdrsp->net.enbdis.context; | |
87a9404e | 1684 | spin_lock_irqsave(&devdata->priv_lock, flags); |
7c03621a DK |
1685 | devdata->enab_dis_acked = 1; |
1686 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1687 | ||
7c03621a DK |
1688 | if (devdata->server_down && |
1689 | devdata->server_change_state) { | |
1690 | /* Inform Linux that the link is up */ | |
1691 | devdata->server_down = false; | |
1692 | devdata->server_change_state = false; | |
1693 | netif_wake_queue(netdev); | |
1694 | netif_carrier_on(netdev); | |
1695 | } | |
1696 | break; | |
1697 | case NET_CONNECT_STATUS: | |
1698 | netdev = devdata->netdev; | |
1699 | if (cmdrsp->net.enbdis.enable == 1) { | |
1700 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
1701 | devdata->enabled = cmdrsp->net.enbdis.enable; | |
1702 | spin_unlock_irqrestore(&devdata->priv_lock, | |
1703 | flags); | |
1704 | netif_wake_queue(netdev); | |
1705 | netif_carrier_on(netdev); | |
1706 | } else { | |
1707 | netif_stop_queue(netdev); | |
1708 | netif_carrier_off(netdev); | |
1709 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
1710 | devdata->enabled = cmdrsp->net.enbdis.enable; | |
1711 | spin_unlock_irqrestore(&devdata->priv_lock, | |
1712 | flags); | |
1713 | } | |
1714 | break; | |
1715 | default: | |
1716 | break; | |
87a9404e | 1717 | } |
7c03621a | 1718 | /* cmdrsp is now available for reuse */ |
68905a14 DK |
1719 | } |
1720 | } | |
1721 | ||
946b2546 NH |
1722 | static int visornic_poll(struct napi_struct *napi, int budget) |
1723 | { | |
1724 | struct visornic_devdata *devdata = container_of(napi, | |
1725 | struct visornic_devdata, | |
1726 | napi); | |
1727 | int rx_count = 0; | |
1728 | ||
1729 | send_rcv_posts_if_needed(devdata); | |
1730 | service_resp_queue(devdata->cmdrsp, devdata, &rx_count); | |
1731 | ||
1732 | /* | |
1733 | * If there aren't any more packets to receive | |
1734 | * stop the poll | |
1735 | */ | |
1736 | if (rx_count < budget) | |
1737 | napi_complete(napi); | |
1738 | ||
1739 | return rx_count; | |
1740 | } | |
1741 | ||
68905a14 | 1742 | /** |
946b2546 | 1743 | * poll_for_irq - Checks the status of the response queue. |
68905a14 DK |
1744 | * @v: void pointer to the visronic devdata |
1745 | * | |
1746 | * Main function of the vnic_incoming thread. Peridocially check the | |
1747 | * response queue and drain it if needed. | |
1748 | * Returns when thread has stopped. | |
1749 | */ | |
946b2546 NH |
1750 | static void |
1751 | poll_for_irq(unsigned long v) | |
68905a14 | 1752 | { |
946b2546 | 1753 | struct visornic_devdata *devdata = (struct visornic_devdata *)v; |
68905a14 | 1754 | |
946b2546 NH |
1755 | if (!visorchannel_signalempty( |
1756 | devdata->dev->visorchannel, | |
1757 | IOCHAN_FROM_IOPART)) | |
1758 | napi_schedule(&devdata->napi); | |
68905a14 | 1759 | |
946b2546 | 1760 | atomic_set(&devdata->interrupt_rcvd, 0); |
68905a14 | 1761 | |
946b2546 | 1762 | mod_timer(&devdata->irq_poll_timer, msecs_to_jiffies(2)); |
68905a14 | 1763 | |
68905a14 DK |
1764 | } |
1765 | ||
1766 | /** | |
1767 | * visornic_probe - probe function for visornic devices | |
1768 | * @dev: The visor device discovered | |
1769 | * | |
1770 | * Called when visorbus discovers a visornic device on its | |
1771 | * bus. It creates a new visornic ethernet adapter. | |
1772 | * Returns 0 or negative for error. | |
1773 | */ | |
1774 | static int visornic_probe(struct visor_device *dev) | |
1775 | { | |
1776 | struct visornic_devdata *devdata = NULL; | |
1777 | struct net_device *netdev = NULL; | |
1778 | int err; | |
1779 | int channel_offset = 0; | |
1780 | u64 features; | |
1781 | ||
1782 | netdev = alloc_etherdev(sizeof(struct visornic_devdata)); | |
00748b0c TS |
1783 | if (!netdev) { |
1784 | dev_err(&dev->device, | |
1785 | "%s alloc_etherdev failed\n", __func__); | |
68905a14 | 1786 | return -ENOMEM; |
00748b0c | 1787 | } |
68905a14 DK |
1788 | |
1789 | netdev->netdev_ops = &visornic_dev_ops; | |
1790 | netdev->watchdog_timeo = (5 * HZ); | |
051e9fbb | 1791 | SET_NETDEV_DEV(netdev, &dev->device); |
68905a14 DK |
1792 | |
1793 | /* Get MAC adddress from channel and read it into the device. */ | |
1794 | netdev->addr_len = ETH_ALEN; | |
1795 | channel_offset = offsetof(struct spar_io_channel_protocol, | |
1796 | vnic.macaddr); | |
1797 | err = visorbus_read_channel(dev, channel_offset, netdev->dev_addr, | |
1798 | ETH_ALEN); | |
00748b0c TS |
1799 | if (err < 0) { |
1800 | dev_err(&dev->device, | |
1801 | "%s failed to get mac addr from chan (%d)\n", | |
1802 | __func__, err); | |
68905a14 | 1803 | goto cleanup_netdev; |
00748b0c | 1804 | } |
68905a14 DK |
1805 | |
1806 | devdata = devdata_initialize(netdev_priv(netdev), dev); | |
1807 | if (!devdata) { | |
00748b0c TS |
1808 | dev_err(&dev->device, |
1809 | "%s devdata_initialize failed\n", __func__); | |
68905a14 DK |
1810 | err = -ENOMEM; |
1811 | goto cleanup_netdev; | |
1812 | } | |
1813 | ||
1814 | devdata->netdev = netdev; | |
5deeea33 | 1815 | dev_set_drvdata(&dev->device, devdata); |
68905a14 DK |
1816 | init_waitqueue_head(&devdata->rsp_queue); |
1817 | spin_lock_init(&devdata->priv_lock); | |
1818 | devdata->enabled = 0; /* not yet */ | |
1819 | atomic_set(&devdata->usage, 1); | |
1820 | ||
1821 | /* Setup rcv bufs */ | |
1822 | channel_offset = offsetof(struct spar_io_channel_protocol, | |
1823 | vnic.num_rcv_bufs); | |
1824 | err = visorbus_read_channel(dev, channel_offset, | |
1825 | &devdata->num_rcv_bufs, 4); | |
00748b0c TS |
1826 | if (err) { |
1827 | dev_err(&dev->device, | |
1828 | "%s failed to get #rcv bufs from chan (%d)\n", | |
1829 | __func__, err); | |
68905a14 | 1830 | goto cleanup_netdev; |
00748b0c | 1831 | } |
68905a14 | 1832 | |
46dfa3d8 | 1833 | devdata->rcvbuf = kzalloc(sizeof(struct sk_buff *) * |
68905a14 DK |
1834 | devdata->num_rcv_bufs, GFP_KERNEL); |
1835 | if (!devdata->rcvbuf) { | |
1836 | err = -ENOMEM; | |
1837 | goto cleanup_rcvbuf; | |
1838 | } | |
1839 | ||
1840 | /* set the net_xmit outstanding threshold */ | |
1841 | /* always leave two slots open but you should have 3 at a minimum */ | |
36927c18 | 1842 | /* note that max_outstanding_net_xmits must be > 0 */ |
68905a14 | 1843 | devdata->max_outstanding_net_xmits = |
36927c18 | 1844 | max_t(unsigned long, 3, ((devdata->num_rcv_bufs / 3) - 2)); |
68905a14 | 1845 | devdata->upper_threshold_net_xmits = |
36927c18 TS |
1846 | max_t(unsigned long, |
1847 | 2, (devdata->max_outstanding_net_xmits - 1)); | |
68905a14 | 1848 | devdata->lower_threshold_net_xmits = |
36927c18 TS |
1849 | max_t(unsigned long, |
1850 | 1, (devdata->max_outstanding_net_xmits / 2)); | |
68905a14 DK |
1851 | |
1852 | skb_queue_head_init(&devdata->xmitbufhead); | |
1853 | ||
1854 | /* create a cmdrsp we can use to post and unpost rcv buffers */ | |
1855 | devdata->cmdrsp_rcv = kmalloc(SIZEOF_CMDRSP, GFP_ATOMIC); | |
1856 | if (!devdata->cmdrsp_rcv) { | |
1857 | err = -ENOMEM; | |
1858 | goto cleanup_cmdrsp_rcv; | |
1859 | } | |
1860 | devdata->xmit_cmdrsp = kmalloc(SIZEOF_CMDRSP, GFP_ATOMIC); | |
1861 | if (!devdata->xmit_cmdrsp) { | |
1862 | err = -ENOMEM; | |
1863 | goto cleanup_xmit_cmdrsp; | |
1864 | } | |
68905a14 DK |
1865 | INIT_WORK(&devdata->timeout_reset, visornic_timeout_reset); |
1866 | devdata->server_down = false; | |
1867 | devdata->server_change_state = false; | |
1868 | ||
1869 | /*set the default mtu */ | |
1870 | channel_offset = offsetof(struct spar_io_channel_protocol, | |
1871 | vnic.mtu); | |
1872 | err = visorbus_read_channel(dev, channel_offset, &netdev->mtu, 4); | |
00748b0c TS |
1873 | if (err) { |
1874 | dev_err(&dev->device, | |
1875 | "%s failed to get mtu from chan (%d)\n", | |
1876 | __func__, err); | |
68905a14 | 1877 | goto cleanup_xmit_cmdrsp; |
00748b0c | 1878 | } |
68905a14 DK |
1879 | |
1880 | /* TODO: Setup Interrupt information */ | |
1881 | /* Let's start our threads to get responses */ | |
946b2546 NH |
1882 | netif_napi_add(netdev, &devdata->napi, visornic_poll, 64); |
1883 | ||
1884 | setup_timer(&devdata->irq_poll_timer, poll_for_irq, | |
1885 | (unsigned long)devdata); | |
1886 | /* | |
1887 | * Note: This time has to start running before the while | |
1888 | * loop below because the napi routine is responsible for | |
1889 | * setting enab_dis_acked | |
1890 | */ | |
1891 | mod_timer(&devdata->irq_poll_timer, msecs_to_jiffies(2)); | |
1892 | ||
68905a14 DK |
1893 | channel_offset = offsetof(struct spar_io_channel_protocol, |
1894 | channel_header.features); | |
1895 | err = visorbus_read_channel(dev, channel_offset, &features, 8); | |
00748b0c TS |
1896 | if (err) { |
1897 | dev_err(&dev->device, | |
1898 | "%s failed to get features from chan (%d)\n", | |
1899 | __func__, err); | |
946b2546 | 1900 | goto cleanup_napi_add; |
00748b0c | 1901 | } |
68905a14 DK |
1902 | |
1903 | features |= ULTRA_IO_CHANNEL_IS_POLLING; | |
1904 | err = visorbus_write_channel(dev, channel_offset, &features, 8); | |
00748b0c TS |
1905 | if (err) { |
1906 | dev_err(&dev->device, | |
1907 | "%s failed to set features in chan (%d)\n", | |
1908 | __func__, err); | |
946b2546 | 1909 | goto cleanup_napi_add; |
00748b0c | 1910 | } |
68905a14 | 1911 | |
68905a14 | 1912 | err = register_netdev(netdev); |
00748b0c TS |
1913 | if (err) { |
1914 | dev_err(&dev->device, | |
1915 | "%s register_netdev failed (%d)\n", __func__, err); | |
946b2546 | 1916 | goto cleanup_napi_add; |
00748b0c | 1917 | } |
68905a14 DK |
1918 | |
1919 | /* create debgug/sysfs directories */ | |
1920 | devdata->eth_debugfs_dir = debugfs_create_dir(netdev->name, | |
1921 | visornic_debugfs_dir); | |
1922 | if (!devdata->eth_debugfs_dir) { | |
00748b0c TS |
1923 | dev_err(&dev->device, |
1924 | "%s debugfs_create_dir %s failed\n", | |
1925 | __func__, netdev->name); | |
68905a14 | 1926 | err = -ENOMEM; |
5b12100a | 1927 | goto cleanup_register_netdev; |
68905a14 DK |
1928 | } |
1929 | ||
00748b0c TS |
1930 | dev_info(&dev->device, "%s success netdev=%s\n", |
1931 | __func__, netdev->name); | |
68905a14 DK |
1932 | return 0; |
1933 | ||
5b12100a DK |
1934 | cleanup_register_netdev: |
1935 | unregister_netdev(netdev); | |
1936 | ||
946b2546 NH |
1937 | cleanup_napi_add: |
1938 | del_timer_sync(&devdata->irq_poll_timer); | |
1939 | netif_napi_del(&devdata->napi); | |
1940 | ||
68905a14 DK |
1941 | cleanup_xmit_cmdrsp: |
1942 | kfree(devdata->xmit_cmdrsp); | |
1943 | ||
1944 | cleanup_cmdrsp_rcv: | |
1945 | kfree(devdata->cmdrsp_rcv); | |
1946 | ||
1947 | cleanup_rcvbuf: | |
1948 | kfree(devdata->rcvbuf); | |
1949 | ||
1950 | cleanup_netdev: | |
1951 | free_netdev(netdev); | |
1952 | return err; | |
1953 | } | |
1954 | ||
1955 | /** | |
1956 | * host_side_disappeared - IO part is gone. | |
1957 | * @devdata: device object | |
1958 | * | |
1959 | * IO partition servicing this device is gone, do cleanup | |
1960 | * Returns void. | |
1961 | */ | |
1962 | static void host_side_disappeared(struct visornic_devdata *devdata) | |
1963 | { | |
1964 | unsigned long flags; | |
1965 | ||
1966 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
1967 | sprintf(devdata->name, "<dev#%d-history>", devdata->devnum); | |
1968 | devdata->dev = NULL; /* indicate device destroyed */ | |
1969 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1970 | } | |
1971 | ||
1972 | /** | |
1973 | * visornic_remove - Called when visornic dev goes away | |
1974 | * @dev: visornic device that is being removed | |
1975 | * | |
1976 | * Called when DEVICE_DESTROY gets called to remove device. | |
1977 | * Returns void | |
1978 | */ | |
1979 | static void visornic_remove(struct visor_device *dev) | |
1980 | { | |
1981 | struct visornic_devdata *devdata = dev_get_drvdata(&dev->device); | |
46df8226 TS |
1982 | struct net_device *netdev; |
1983 | unsigned long flags; | |
68905a14 | 1984 | |
00748b0c TS |
1985 | if (!devdata) { |
1986 | dev_err(&dev->device, "%s no devdata\n", __func__); | |
68905a14 | 1987 | return; |
00748b0c | 1988 | } |
46df8226 TS |
1989 | spin_lock_irqsave(&devdata->priv_lock, flags); |
1990 | if (devdata->going_away) { | |
1991 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1992 | dev_err(&dev->device, "%s already being removed\n", __func__); | |
1993 | return; | |
1994 | } | |
1995 | devdata->going_away = true; | |
1996 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1997 | netdev = devdata->netdev; | |
1998 | if (!netdev) { | |
1999 | dev_err(&dev->device, "%s not net device\n", __func__); | |
2000 | return; | |
2001 | } | |
2002 | ||
2003 | /* going_away prevents new items being added to the workqueues */ | |
46df8226 TS |
2004 | flush_workqueue(visornic_timeout_reset_workqueue); |
2005 | ||
2006 | debugfs_remove_recursive(devdata->eth_debugfs_dir); | |
2007 | ||
2008 | unregister_netdev(netdev); /* this will call visornic_close() */ | |
2009 | ||
946b2546 NH |
2010 | del_timer_sync(&devdata->irq_poll_timer); |
2011 | netif_napi_del(&devdata->napi); | |
46df8226 | 2012 | |
68905a14 DK |
2013 | dev_set_drvdata(&dev->device, NULL); |
2014 | host_side_disappeared(devdata); | |
8d0119d8 | 2015 | devdata_release(devdata); |
46df8226 | 2016 | free_netdev(netdev); |
68905a14 DK |
2017 | } |
2018 | ||
2019 | /** | |
2020 | * visornic_pause - Called when IO Part disappears | |
2021 | * @dev: visornic device that is being serviced | |
2022 | * @complete_func: call when finished. | |
2023 | * | |
2024 | * Called when the IO Partition has gone down. Need to free | |
2025 | * up resources and wait for IO partition to come back. Mark | |
2026 | * link as down and don't attempt any DMA. When we have freed | |
2027 | * memory call the complete_func so that Command knows we are | |
2028 | * done. If we don't call complete_func, IO part will never | |
2029 | * come back. | |
2030 | * Returns 0 for success. | |
2031 | */ | |
2032 | static int visornic_pause(struct visor_device *dev, | |
2033 | visorbus_state_complete_func complete_func) | |
2034 | { | |
2035 | struct visornic_devdata *devdata = dev_get_drvdata(&dev->device); | |
2036 | ||
d01da5ea | 2037 | visornic_serverdown(devdata, complete_func); |
68905a14 DK |
2038 | return 0; |
2039 | } | |
2040 | ||
2041 | /** | |
2042 | * visornic_resume - Called when IO part has recovered | |
2043 | * @dev: visornic device that is being serviced | |
2044 | * @compelte_func: call when finished | |
2045 | * | |
2046 | * Called when the IO partition has recovered. Reestablish | |
2047 | * connection to the IO part and set the link up. Okay to do | |
2048 | * DMA again. | |
2049 | * Returns 0 for success. | |
2050 | */ | |
2051 | static int visornic_resume(struct visor_device *dev, | |
2052 | visorbus_state_complete_func complete_func) | |
2053 | { | |
2054 | struct visornic_devdata *devdata; | |
2055 | struct net_device *netdev; | |
2056 | unsigned long flags; | |
2057 | ||
2058 | devdata = dev_get_drvdata(&dev->device); | |
00748b0c TS |
2059 | if (!devdata) { |
2060 | dev_err(&dev->device, "%s no devdata\n", __func__); | |
68905a14 | 2061 | return -EINVAL; |
00748b0c | 2062 | } |
68905a14 DK |
2063 | |
2064 | netdev = devdata->netdev; | |
2065 | ||
c847020e TS |
2066 | spin_lock_irqsave(&devdata->priv_lock, flags); |
2067 | if (devdata->server_change_state) { | |
68905a14 | 2068 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
c847020e | 2069 | dev_err(&dev->device, "%s server already changing state\n", |
00748b0c | 2070 | __func__); |
c847020e | 2071 | return -EINVAL; |
68905a14 | 2072 | } |
c847020e TS |
2073 | if (!devdata->server_down) { |
2074 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
2075 | dev_err(&dev->device, "%s server not down\n", __func__); | |
2076 | complete_func(dev, 0); | |
2077 | return 0; | |
2078 | } | |
2079 | devdata->server_change_state = true; | |
2080 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
946b2546 | 2081 | |
c847020e TS |
2082 | /* Must transition channel to ATTACHED state BEFORE |
2083 | * we can start using the device again. | |
2084 | * TODO: State transitions | |
2085 | */ | |
946b2546 NH |
2086 | mod_timer(&devdata->irq_poll_timer, msecs_to_jiffies(2)); |
2087 | ||
2088 | init_rcv_bufs(netdev, devdata); | |
c847020e TS |
2089 | |
2090 | rtnl_lock(); | |
2091 | dev_open(netdev); | |
2092 | rtnl_unlock(); | |
68905a14 DK |
2093 | |
2094 | complete_func(dev, 0); | |
2095 | return 0; | |
2096 | } | |
2097 | ||
2098 | /** | |
2099 | * visornic_init - Init function | |
2100 | * | |
2101 | * Init function for the visornic driver. Do initial driver setup | |
2102 | * and wait for devices. | |
2103 | * Returns 0 for success, negative for error. | |
2104 | */ | |
2105 | static int visornic_init(void) | |
2106 | { | |
2107 | struct dentry *ret; | |
2108 | int err = -ENOMEM; | |
2109 | ||
68905a14 DK |
2110 | visornic_debugfs_dir = debugfs_create_dir("visornic", NULL); |
2111 | if (!visornic_debugfs_dir) | |
2112 | return err; | |
2113 | ||
2114 | ret = debugfs_create_file("info", S_IRUSR, visornic_debugfs_dir, NULL, | |
2115 | &debugfs_info_fops); | |
2116 | if (!ret) | |
2117 | goto cleanup_debugfs; | |
2118 | ret = debugfs_create_file("enable_ints", S_IWUSR, visornic_debugfs_dir, | |
2119 | NULL, &debugfs_enable_ints_fops); | |
2120 | if (!ret) | |
2121 | goto cleanup_debugfs; | |
2122 | ||
68905a14 DK |
2123 | /* create workqueue for tx timeout reset */ |
2124 | visornic_timeout_reset_workqueue = | |
2125 | create_singlethread_workqueue("visornic_timeout_reset"); | |
2126 | if (!visornic_timeout_reset_workqueue) | |
2127 | goto cleanup_workqueue; | |
2128 | ||
2129 | spin_lock_init(&dev_num_pool_lock); | |
2130 | dev_num_pool = kzalloc(BITS_TO_LONGS(MAXDEVICES), GFP_KERNEL); | |
2131 | if (!dev_num_pool) | |
2132 | goto cleanup_workqueue; | |
2133 | ||
2134 | visorbus_register_visor_driver(&visornic_driver); | |
2135 | return 0; | |
2136 | ||
2137 | cleanup_workqueue: | |
68905a14 DK |
2138 | if (visornic_timeout_reset_workqueue) { |
2139 | flush_workqueue(visornic_timeout_reset_workqueue); | |
2140 | destroy_workqueue(visornic_timeout_reset_workqueue); | |
2141 | } | |
2142 | cleanup_debugfs: | |
2143 | debugfs_remove_recursive(visornic_debugfs_dir); | |
2144 | ||
2145 | return err; | |
2146 | } | |
2147 | ||
2148 | /** | |
2149 | * visornic_cleanup - driver exit routine | |
2150 | * | |
2151 | * Unregister driver from the bus and free up memory. | |
2152 | */ | |
2153 | static void visornic_cleanup(void) | |
2154 | { | |
3798ff31 TS |
2155 | visorbus_unregister_visor_driver(&visornic_driver); |
2156 | ||
68905a14 DK |
2157 | if (visornic_timeout_reset_workqueue) { |
2158 | flush_workqueue(visornic_timeout_reset_workqueue); | |
2159 | destroy_workqueue(visornic_timeout_reset_workqueue); | |
2160 | } | |
2161 | debugfs_remove_recursive(visornic_debugfs_dir); | |
2162 | ||
68905a14 DK |
2163 | kfree(dev_num_pool); |
2164 | dev_num_pool = NULL; | |
2165 | } | |
2166 | ||
2167 | module_init(visornic_init); | |
2168 | module_exit(visornic_cleanup); | |
2169 | ||
2170 | MODULE_AUTHOR("Unisys"); | |
2171 | MODULE_LICENSE("GPL"); | |
2172 | MODULE_DESCRIPTION("sPAR nic driver for sparlinux: ver 1.0.0.0"); | |
2173 | MODULE_VERSION("1.0.0.0"); |