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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 | |
33 | /* MAX_BUF = 64 lines x 32 MAXVNIC x 80 characters | |
34 | * = 163840 bytes | |
35 | */ | |
36 | #define MAX_BUF 163840 | |
61dd330a | 37 | #define NAPI_WEIGHT 64 |
68905a14 | 38 | |
68905a14 DK |
39 | static int visornic_probe(struct visor_device *dev); |
40 | static void visornic_remove(struct visor_device *dev); | |
41 | static int visornic_pause(struct visor_device *dev, | |
42 | visorbus_state_complete_func complete_func); | |
43 | static int visornic_resume(struct visor_device *dev, | |
44 | visorbus_state_complete_func complete_func); | |
45 | ||
46 | /* DEBUGFS declarations */ | |
47 | static ssize_t info_debugfs_read(struct file *file, char __user *buf, | |
48 | size_t len, loff_t *offset); | |
49 | static ssize_t enable_ints_write(struct file *file, const char __user *buf, | |
50 | size_t len, loff_t *ppos); | |
51 | static struct dentry *visornic_debugfs_dir; | |
52 | static const struct file_operations debugfs_info_fops = { | |
53 | .read = info_debugfs_read, | |
54 | }; | |
55 | ||
56 | static const struct file_operations debugfs_enable_ints_fops = { | |
57 | .write = enable_ints_write, | |
58 | }; | |
59 | ||
68905a14 DK |
60 | /* GUIDS for director channel type supported by this driver. */ |
61 | static struct visor_channeltype_descriptor visornic_channel_types[] = { | |
62 | /* Note that the only channel type we expect to be reported by the | |
63 | * bus driver is the SPAR_VNIC channel. | |
64 | */ | |
65 | { SPAR_VNIC_CHANNEL_PROTOCOL_UUID, "ultravnic" }, | |
66 | { NULL_UUID_LE, NULL } | |
67 | }; | |
110a66be PB |
68 | MODULE_DEVICE_TABLE(visorbus, visornic_channel_types); |
69 | /* | |
70 | * FIXME XXX: This next line of code must be fixed and removed before | |
71 | * acceptance into the 'normal' part of the kernel. It is only here as a place | |
72 | * holder to get module autoloading functionality working for visorbus. Code | |
73 | * must be added to scripts/mode/file2alias.c, etc., to get this working | |
74 | * properly. | |
75 | */ | |
76 | MODULE_ALIAS("visorbus:" SPAR_VNIC_CHANNEL_PROTOCOL_UUID_STR); | |
68905a14 DK |
77 | |
78 | /* This is used to tell the visor bus driver which types of visor devices | |
79 | * we support, and what functions to call when a visor device that we support | |
80 | * is attached or removed. | |
81 | */ | |
82 | static struct visor_driver visornic_driver = { | |
83 | .name = "visornic", | |
84 | .version = "1.0.0.0", | |
85 | .vertag = NULL, | |
86 | .owner = THIS_MODULE, | |
87 | .channel_types = visornic_channel_types, | |
88 | .probe = visornic_probe, | |
89 | .remove = visornic_remove, | |
90 | .pause = visornic_pause, | |
91 | .resume = visornic_resume, | |
92 | .channel_interrupt = NULL, | |
93 | }; | |
94 | ||
68905a14 DK |
95 | struct chanstat { |
96 | unsigned long got_rcv; | |
97 | unsigned long got_enbdisack; | |
98 | unsigned long got_xmit_done; | |
99 | unsigned long xmit_fail; | |
100 | unsigned long sent_enbdis; | |
101 | unsigned long sent_promisc; | |
102 | unsigned long sent_post; | |
81d275c6 | 103 | unsigned long sent_post_failed; |
68905a14 DK |
104 | unsigned long sent_xmit; |
105 | unsigned long reject_count; | |
106 | unsigned long extra_rcvbufs_sent; | |
107 | }; | |
108 | ||
109 | struct visornic_devdata { | |
77c9a4ae EA |
110 | /* 0 disabled 1 enabled to receive */ |
111 | unsigned short enabled; | |
112 | /* NET_RCV_ENABLE/DISABLE acked by IOPART */ | |
113 | unsigned short enab_dis_acked; | |
114 | ||
68905a14 | 115 | struct visor_device *dev; |
68905a14 DK |
116 | struct net_device *netdev; |
117 | struct net_device_stats net_stats; | |
118 | atomic_t interrupt_rcvd; | |
119 | wait_queue_head_t rsp_queue; | |
120 | struct sk_buff **rcvbuf; | |
77c9a4ae EA |
121 | /* incarnation_id lets IOPART know about re-birth */ |
122 | u64 incarnation_id; | |
123 | /* flags as they were prior to set_multicast_list */ | |
124 | unsigned short old_flags; | |
125 | atomic_t usage; /* count of users */ | |
126 | ||
127 | /* number of rcv buffers the vnic will post */ | |
128 | int num_rcv_bufs; | |
68905a14 DK |
129 | int num_rcv_bufs_could_not_alloc; |
130 | atomic_t num_rcvbuf_in_iovm; | |
131 | unsigned long alloc_failed_in_if_needed_cnt; | |
132 | unsigned long alloc_failed_in_repost_rtn_cnt; | |
77c9a4ae EA |
133 | |
134 | /* absolute max number of outstanding xmits - should never hit this */ | |
135 | unsigned long max_outstanding_net_xmits; | |
136 | /* high water mark for calling netif_stop_queue() */ | |
137 | unsigned long upper_threshold_net_xmits; | |
138 | /* high water mark for calling netif_wake_queue() */ | |
139 | unsigned long lower_threshold_net_xmits; | |
140 | /* xmitbufhead - head of the xmit buffer list sent to the IOPART end */ | |
141 | struct sk_buff_head xmitbufhead; | |
142 | ||
d01da5ea | 143 | visorbus_state_complete_func server_down_complete_func; |
68905a14 | 144 | struct work_struct timeout_reset; |
77c9a4ae EA |
145 | /* cmdrsp_rcv is used for posting/unposting rcv buffers */ |
146 | struct uiscmdrsp *cmdrsp_rcv; | |
147 | /* xmit_cmdrsp - issues NET_XMIT - only one active xmit at a time */ | |
148 | struct uiscmdrsp *xmit_cmdrsp; | |
149 | ||
68905a14 DK |
150 | bool server_down; /* IOPART is down */ |
151 | bool server_change_state; /* Processing SERVER_CHANGESTATE msg */ | |
46df8226 | 152 | bool going_away; /* device is being torn down */ |
68905a14 | 153 | struct dentry *eth_debugfs_dir; |
68905a14 DK |
154 | u64 interrupts_rcvd; |
155 | u64 interrupts_notme; | |
156 | u64 interrupts_disabled; | |
157 | u64 busy_cnt; | |
158 | spinlock_t priv_lock; /* spinlock to access devdata structures */ | |
159 | ||
160 | /* flow control counter */ | |
161 | u64 flow_control_upper_hits; | |
162 | u64 flow_control_lower_hits; | |
163 | ||
164 | /* debug counters */ | |
165 | unsigned long n_rcv0; /* # rcvs of 0 buffers */ | |
166 | unsigned long n_rcv1; /* # rcvs of 1 buffers */ | |
167 | unsigned long n_rcv2; /* # rcvs of 2 buffers */ | |
168 | unsigned long n_rcvx; /* # rcvs of >2 buffers */ | |
77c9a4ae EA |
169 | unsigned long found_repost_rcvbuf_cnt; /* # repost_rcvbuf_cnt */ |
170 | unsigned long repost_found_skb_cnt; /* # of found the skb */ | |
171 | unsigned long n_repost_deficit; /* # of lost rcv buffers */ | |
172 | unsigned long bad_rcv_buf; /* # of unknown rcv skb not freed */ | |
68905a14 DK |
173 | unsigned long n_rcv_packets_not_accepted;/* # bogs rcv packets */ |
174 | ||
175 | int queuefullmsg_logged; | |
176 | struct chanstat chstat; | |
946b2546 NH |
177 | struct timer_list irq_poll_timer; |
178 | struct napi_struct napi; | |
179 | struct uiscmdrsp cmdrsp[SIZEOF_CMDRSP]; | |
68905a14 DK |
180 | }; |
181 | ||
946b2546 NH |
182 | static int visornic_poll(struct napi_struct *napi, int budget); |
183 | static void poll_for_irq(unsigned long v); | |
68905a14 DK |
184 | |
185 | /** | |
186 | * visor_copy_fragsinfo_from_skb( | |
187 | * @skb_in: skbuff that we are pulling the frags from | |
188 | * @firstfraglen: length of first fragment in skb | |
189 | * @frags_max: max len of frags array | |
190 | * @frags: frags array filled in on output | |
191 | * | |
192 | * Copy the fragment list in the SKB to a phys_info | |
193 | * array that the IOPART understands. | |
194 | * Return value indicates number of entries filled in frags | |
195 | * Negative values indicate an error. | |
196 | */ | |
6a957193 | 197 | static int |
68905a14 DK |
198 | visor_copy_fragsinfo_from_skb(struct sk_buff *skb, unsigned int firstfraglen, |
199 | unsigned int frags_max, | |
200 | struct phys_info frags[]) | |
201 | { | |
03759f8c | 202 | unsigned int count = 0, frag, size, offset = 0, numfrags; |
513e1cbd | 203 | unsigned int total_count; |
68905a14 DK |
204 | |
205 | numfrags = skb_shinfo(skb)->nr_frags; | |
206 | ||
77c9a4ae | 207 | /* Compute the number of fragments this skb has, and if its more than |
513e1cbd NH |
208 | * frag array can hold, linearize the skb |
209 | */ | |
210 | total_count = numfrags + (firstfraglen / PI_PAGE_SIZE); | |
211 | if (firstfraglen % PI_PAGE_SIZE) | |
212 | total_count++; | |
213 | ||
214 | if (total_count > frags_max) { | |
215 | if (skb_linearize(skb)) | |
216 | return -EINVAL; | |
217 | numfrags = skb_shinfo(skb)->nr_frags; | |
218 | firstfraglen = 0; | |
219 | } | |
220 | ||
68905a14 DK |
221 | while (firstfraglen) { |
222 | if (count == frags_max) | |
223 | return -EINVAL; | |
224 | ||
225 | frags[count].pi_pfn = | |
226 | page_to_pfn(virt_to_page(skb->data + offset)); | |
227 | frags[count].pi_off = | |
228 | (unsigned long)(skb->data + offset) & PI_PAGE_MASK; | |
229 | size = min_t(unsigned int, firstfraglen, | |
230 | PI_PAGE_SIZE - frags[count].pi_off); | |
231 | ||
232 | /* can take smallest of firstfraglen (what's left) OR | |
233 | * bytes left in the page | |
234 | */ | |
235 | frags[count].pi_len = size; | |
236 | firstfraglen -= size; | |
237 | offset += size; | |
238 | count++; | |
239 | } | |
240 | if (numfrags) { | |
241 | if ((count + numfrags) > frags_max) | |
242 | return -EINVAL; | |
243 | ||
03759f8c | 244 | for (frag = 0; frag < numfrags; frag++) { |
68905a14 | 245 | count = add_physinfo_entries(page_to_pfn( |
03759f8c EA |
246 | skb_frag_page(&skb_shinfo(skb)->frags[frag])), |
247 | skb_shinfo(skb)->frags[frag]. | |
68905a14 | 248 | page_offset, |
03759f8c | 249 | skb_shinfo(skb)->frags[frag]. |
68905a14 | 250 | size, count, frags_max, frags); |
77c9a4ae | 251 | /* add_physinfo_entries only returns |
998ff7f8 NH |
252 | * zero if the frags array is out of room |
253 | * That should never happen because we | |
254 | * fail above, if count+numfrags > frags_max. | |
998ff7f8 | 255 | */ |
6a957193 TS |
256 | if (!count) |
257 | return -EINVAL; | |
68905a14 DK |
258 | } |
259 | } | |
260 | if (skb_shinfo(skb)->frag_list) { | |
261 | struct sk_buff *skbinlist; | |
262 | int c; | |
263 | ||
264 | for (skbinlist = skb_shinfo(skb)->frag_list; skbinlist; | |
265 | skbinlist = skbinlist->next) { | |
266 | c = visor_copy_fragsinfo_from_skb(skbinlist, | |
267 | skbinlist->len - | |
268 | skbinlist->data_len, | |
269 | frags_max - count, | |
270 | &frags[count]); | |
271 | if (c < 0) | |
272 | return c; | |
273 | count += c; | |
274 | } | |
275 | } | |
276 | return count; | |
277 | } | |
278 | ||
68905a14 DK |
279 | static ssize_t enable_ints_write(struct file *file, |
280 | const char __user *buffer, | |
281 | size_t count, loff_t *ppos) | |
282 | { | |
77c9a4ae | 283 | /* Don't want to break ABI here by having a debugfs |
52b1660d NH |
284 | * file that no longer exists or is writable, so |
285 | * lets just make this a vestigual function | |
286 | */ | |
68905a14 DK |
287 | return count; |
288 | } | |
289 | ||
290 | /** | |
77c9a4ae | 291 | * visornic_serverdown_complete - IOPART went down, pause device |
68905a14 DK |
292 | * @work: Work queue it was scheduled on |
293 | * | |
294 | * The IO partition has gone down and we need to do some cleanup | |
295 | * for when it comes back. Treat the IO partition as the link | |
296 | * being down. | |
297 | * Returns void. | |
298 | */ | |
299 | static void | |
ace72eef | 300 | visornic_serverdown_complete(struct visornic_devdata *devdata) |
68905a14 | 301 | { |
68905a14 | 302 | struct net_device *netdev; |
68905a14 | 303 | |
68905a14 DK |
304 | netdev = devdata->netdev; |
305 | ||
946b2546 NH |
306 | /* Stop polling for interrupts */ |
307 | del_timer_sync(&devdata->irq_poll_timer); | |
68905a14 | 308 | |
0d507393 NH |
309 | rtnl_lock(); |
310 | dev_close(netdev); | |
311 | rtnl_unlock(); | |
68905a14 | 312 | |
68905a14 | 313 | atomic_set(&devdata->num_rcvbuf_in_iovm, 0); |
db849927 TS |
314 | devdata->chstat.sent_xmit = 0; |
315 | devdata->chstat.got_xmit_done = 0; | |
68905a14 | 316 | |
d01da5ea TS |
317 | if (devdata->server_down_complete_func) |
318 | (*devdata->server_down_complete_func)(devdata->dev, 0); | |
319 | ||
68905a14 DK |
320 | devdata->server_down = true; |
321 | devdata->server_change_state = false; | |
d01da5ea | 322 | devdata->server_down_complete_func = NULL; |
68905a14 DK |
323 | } |
324 | ||
325 | /** | |
77c9a4ae | 326 | * visornic_serverdown - Command has notified us that IOPART is down |
68905a14 DK |
327 | * @devdata: device that is being managed by IOPART |
328 | * | |
329 | * Schedule the work needed to handle the server down request. Make | |
330 | * sure we haven't already handled the server change state event. | |
331 | * Returns 0 if we scheduled the work, -EINVAL on error. | |
332 | */ | |
333 | static int | |
d01da5ea TS |
334 | visornic_serverdown(struct visornic_devdata *devdata, |
335 | visorbus_state_complete_func complete_func) | |
68905a14 | 336 | { |
46df8226 | 337 | unsigned long flags; |
4145ba76 | 338 | int err; |
46df8226 TS |
339 | |
340 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
4145ba76 | 341 | if (devdata->server_change_state) { |
00748b0c TS |
342 | dev_dbg(&devdata->dev->device, "%s changing state\n", |
343 | __func__); | |
4145ba76 TS |
344 | err = -EINVAL; |
345 | goto err_unlock; | |
346 | } | |
347 | if (devdata->server_down) { | |
348 | dev_dbg(&devdata->dev->device, "%s already down\n", | |
349 | __func__); | |
350 | err = -EINVAL; | |
351 | goto err_unlock; | |
352 | } | |
353 | if (devdata->going_away) { | |
354 | dev_dbg(&devdata->dev->device, | |
355 | "%s aborting because device removal pending\n", | |
356 | __func__); | |
357 | err = -ENODEV; | |
358 | goto err_unlock; | |
05f1b17e | 359 | } |
4145ba76 TS |
360 | devdata->server_change_state = true; |
361 | devdata->server_down_complete_func = complete_func; | |
05f1b17e | 362 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
4145ba76 TS |
363 | |
364 | visornic_serverdown_complete(devdata); | |
68905a14 | 365 | return 0; |
4145ba76 TS |
366 | |
367 | err_unlock: | |
368 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
369 | return err; | |
68905a14 DK |
370 | } |
371 | ||
372 | /** | |
373 | * alloc_rcv_buf - alloc rcv buffer to be given to the IO Partition. | |
374 | * @netdev: network adapter the rcv bufs are attached too. | |
375 | * | |
376 | * Create an sk_buff (rcv_buf) that will be passed to the IO Partition | |
377 | * so that it can write rcv data into our memory space. | |
378 | * Return pointer to sk_buff | |
379 | */ | |
380 | static struct sk_buff * | |
381 | alloc_rcv_buf(struct net_device *netdev) | |
382 | { | |
383 | struct sk_buff *skb; | |
384 | ||
385 | /* NOTE: the first fragment in each rcv buffer is pointed to by | |
386 | * rcvskb->data. For now all rcv buffers will be RCVPOST_BUF_SIZE | |
77c9a4ae | 387 | * in length, so the first frag is large enough to hold 1514. |
68905a14 DK |
388 | */ |
389 | skb = alloc_skb(RCVPOST_BUF_SIZE, GFP_ATOMIC); | |
390 | if (!skb) | |
391 | return NULL; | |
392 | skb->dev = netdev; | |
68905a14 DK |
393 | /* current value of mtu doesn't come into play here; large |
394 | * packets will just end up using multiple rcv buffers all of | |
77c9a4ae | 395 | * same size. |
68905a14 | 396 | */ |
77c9a4ae EA |
397 | skb->len = RCVPOST_BUF_SIZE; |
398 | /* alloc_skb already zeroes it out for clarification. */ | |
399 | skb->data_len = 0; | |
68905a14 DK |
400 | return skb; |
401 | } | |
402 | ||
403 | /** | |
404 | * post_skb - post a skb to the IO Partition. | |
405 | * @cmdrsp: cmdrsp packet to be send to the IO Partition | |
406 | * @devdata: visornic_devdata to post the skb too | |
407 | * @skb: skb to give to the IO partition | |
408 | * | |
409 | * Send the skb to the IO Partition. | |
410 | * Returns void | |
411 | */ | |
412 | static inline void | |
413 | post_skb(struct uiscmdrsp *cmdrsp, | |
414 | struct visornic_devdata *devdata, struct sk_buff *skb) | |
415 | { | |
416 | cmdrsp->net.buf = skb; | |
417 | cmdrsp->net.rcvpost.frag.pi_pfn = page_to_pfn(virt_to_page(skb->data)); | |
418 | cmdrsp->net.rcvpost.frag.pi_off = | |
419 | (unsigned long)skb->data & PI_PAGE_MASK; | |
420 | cmdrsp->net.rcvpost.frag.pi_len = skb->len; | |
91678f37 | 421 | cmdrsp->net.rcvpost.unique_num = devdata->incarnation_id; |
68905a14 DK |
422 | |
423 | if ((cmdrsp->net.rcvpost.frag.pi_off + skb->len) <= PI_PAGE_SIZE) { | |
424 | cmdrsp->net.type = NET_RCV_POST; | |
425 | cmdrsp->cmdtype = CMD_NET_TYPE; | |
81d275c6 | 426 | if (visorchannel_signalinsert(devdata->dev->visorchannel, |
dc38082f TS |
427 | IOCHAN_TO_IOPART, |
428 | cmdrsp)) { | |
81d275c6 TS |
429 | atomic_inc(&devdata->num_rcvbuf_in_iovm); |
430 | devdata->chstat.sent_post++; | |
431 | } else { | |
432 | devdata->chstat.sent_post_failed++; | |
433 | } | |
68905a14 DK |
434 | } |
435 | } | |
436 | ||
437 | /** | |
438 | * send_enbdis - send NET_RCV_ENBDIS to IO Partition | |
439 | * @netdev: netdevice we are enable/disable, used as context | |
440 | * return value | |
441 | * @state: enable = 1/disable = 0 | |
442 | * @devdata: visornic device we are enabling/disabling | |
443 | * | |
444 | * Send the enable/disable message to the IO Partition. | |
445 | * Returns void | |
446 | */ | |
447 | static void | |
448 | send_enbdis(struct net_device *netdev, int state, | |
449 | struct visornic_devdata *devdata) | |
450 | { | |
451 | devdata->cmdrsp_rcv->net.enbdis.enable = state; | |
452 | devdata->cmdrsp_rcv->net.enbdis.context = netdev; | |
453 | devdata->cmdrsp_rcv->net.type = NET_RCV_ENBDIS; | |
454 | devdata->cmdrsp_rcv->cmdtype = CMD_NET_TYPE; | |
81d275c6 | 455 | if (visorchannel_signalinsert(devdata->dev->visorchannel, |
dc38082f TS |
456 | IOCHAN_TO_IOPART, |
457 | devdata->cmdrsp_rcv)) | |
81d275c6 | 458 | devdata->chstat.sent_enbdis++; |
68905a14 DK |
459 | } |
460 | ||
461 | /** | |
462 | * visornic_disable_with_timeout - Disable network adapter | |
463 | * @netdev: netdevice to disale | |
464 | * @timeout: timeout to wait for disable | |
465 | * | |
466 | * Disable the network adapter and inform the IO Partition that we | |
467 | * are disabled, reclaim memory from rcv bufs. | |
468 | * Returns 0 on success, negative for failure of IO Partition | |
469 | * responding. | |
470 | * | |
471 | */ | |
472 | static int | |
473 | visornic_disable_with_timeout(struct net_device *netdev, const int timeout) | |
474 | { | |
475 | struct visornic_devdata *devdata = netdev_priv(netdev); | |
476 | int i; | |
477 | unsigned long flags; | |
478 | int wait = 0; | |
479 | ||
68905a14 DK |
480 | /* send a msg telling the other end we are stopping incoming pkts */ |
481 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
482 | devdata->enabled = 0; | |
483 | devdata->enab_dis_acked = 0; /* must wait for ack */ | |
484 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
485 | ||
486 | /* send disable and wait for ack -- don't hold lock when sending | |
487 | * disable because if the queue is full, insert might sleep. | |
488 | */ | |
489 | send_enbdis(netdev, 0, devdata); | |
490 | ||
491 | /* wait for ack to arrive before we try to free rcv buffers | |
492 | * NOTE: the other end automatically unposts the rcv buffers when | |
493 | * when it gets a disable. | |
494 | */ | |
495 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
0c677e9c | 496 | while ((timeout == VISORNIC_INFINITE_RSP_WAIT) || |
68905a14 DK |
497 | (wait < timeout)) { |
498 | if (devdata->enab_dis_acked) | |
499 | break; | |
500 | if (devdata->server_down || devdata->server_change_state) { | |
501 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
00748b0c TS |
502 | dev_dbg(&netdev->dev, "%s server went away\n", |
503 | __func__); | |
68905a14 DK |
504 | return -EIO; |
505 | } | |
506 | set_current_state(TASK_INTERRUPTIBLE); | |
507 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
508 | wait += schedule_timeout(msecs_to_jiffies(10)); | |
509 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
510 | } | |
511 | ||
512 | /* Wait for usage to go to 1 (no other users) before freeing | |
513 | * rcv buffers | |
514 | */ | |
515 | if (atomic_read(&devdata->usage) > 1) { | |
516 | while (1) { | |
517 | set_current_state(TASK_INTERRUPTIBLE); | |
518 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
519 | schedule_timeout(msecs_to_jiffies(10)); | |
520 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
521 | if (atomic_read(&devdata->usage)) | |
522 | break; | |
523 | } | |
524 | } | |
68905a14 DK |
525 | /* we've set enabled to 0, so we can give up the lock. */ |
526 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
527 | ||
946b2546 NH |
528 | /* stop the transmit queue so nothing more can be transmitted */ |
529 | netif_stop_queue(netdev); | |
530 | ||
531 | napi_disable(&devdata->napi); | |
532 | ||
0d507393 NH |
533 | skb_queue_purge(&devdata->xmitbufhead); |
534 | ||
68905a14 DK |
535 | /* Free rcv buffers - other end has automatically unposed them on |
536 | * disable | |
537 | */ | |
538 | for (i = 0; i < devdata->num_rcv_bufs; i++) { | |
539 | if (devdata->rcvbuf[i]) { | |
540 | kfree_skb(devdata->rcvbuf[i]); | |
541 | devdata->rcvbuf[i] = NULL; | |
542 | } | |
543 | } | |
544 | ||
68905a14 DK |
545 | return 0; |
546 | } | |
547 | ||
548 | /** | |
549 | * init_rcv_bufs -- initialize receive bufs and send them to the IO Part | |
550 | * @netdev: struct netdevice | |
551 | * @devdata: visornic_devdata | |
552 | * | |
553 | * Allocate rcv buffers and post them to the IO Partition. | |
554 | * Return 0 for success, and negative for failure. | |
555 | */ | |
556 | static int | |
557 | init_rcv_bufs(struct net_device *netdev, struct visornic_devdata *devdata) | |
558 | { | |
559 | int i, count; | |
560 | ||
561 | /* allocate fixed number of receive buffers to post to uisnic | |
562 | * post receive buffers after we've allocated a required amount | |
563 | */ | |
564 | for (i = 0; i < devdata->num_rcv_bufs; i++) { | |
565 | devdata->rcvbuf[i] = alloc_rcv_buf(netdev); | |
566 | if (!devdata->rcvbuf[i]) | |
567 | break; /* if we failed to allocate one let us stop */ | |
568 | } | |
569 | if (i == 0) /* couldn't even allocate one -- bail out */ | |
570 | return -ENOMEM; | |
571 | count = i; | |
572 | ||
573 | /* Ensure we can alloc 2/3rd of the requeested number of buffers. | |
574 | * 2/3 is an arbitrary choice; used also in ndis init.c | |
575 | */ | |
576 | if (count < ((2 * devdata->num_rcv_bufs) / 3)) { | |
577 | /* free receive buffers we did alloc and then bail out */ | |
578 | for (i = 0; i < count; i++) { | |
579 | kfree_skb(devdata->rcvbuf[i]); | |
580 | devdata->rcvbuf[i] = NULL; | |
581 | } | |
582 | return -ENOMEM; | |
583 | } | |
584 | ||
585 | /* post receive buffers to receive incoming input - without holding | |
586 | * lock - we've not enabled nor started the queue so there shouldn't | |
587 | * be any rcv or xmit activity | |
588 | */ | |
589 | for (i = 0; i < count; i++) | |
590 | post_skb(devdata->cmdrsp_rcv, devdata, devdata->rcvbuf[i]); | |
591 | ||
592 | return 0; | |
593 | } | |
594 | ||
595 | /** | |
596 | * visornic_enable_with_timeout - send enable to IO Part | |
597 | * @netdev: struct net_device | |
598 | * @timeout: Time to wait for the ACK from the enable | |
599 | * | |
600 | * Sends enable to IOVM, inits, and posts receive buffers to IOVM | |
601 | * timeout is defined in msecs (timeout of 0 specifies infinite wait) | |
602 | * Return 0 for success, negavite for failure. | |
603 | */ | |
604 | static int | |
605 | visornic_enable_with_timeout(struct net_device *netdev, const int timeout) | |
606 | { | |
607 | int i; | |
608 | struct visornic_devdata *devdata = netdev_priv(netdev); | |
609 | unsigned long flags; | |
610 | int wait = 0; | |
611 | ||
612 | /* NOTE: the other end automatically unposts the rcv buffers when it | |
613 | * gets a disable. | |
614 | */ | |
615 | i = init_rcv_bufs(netdev, devdata); | |
00748b0c TS |
616 | if (i < 0) { |
617 | dev_err(&netdev->dev, | |
618 | "%s failed to init rcv bufs (%d)\n", __func__, i); | |
68905a14 | 619 | return i; |
00748b0c | 620 | } |
68905a14 DK |
621 | |
622 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
623 | devdata->enabled = 1; | |
6483783d | 624 | devdata->enab_dis_acked = 0; |
68905a14 DK |
625 | |
626 | /* now we're ready, let's send an ENB to uisnic but until we get | |
627 | * an ACK back from uisnic, we'll drop the packets | |
628 | */ | |
629 | devdata->n_rcv_packets_not_accepted = 0; | |
630 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
631 | ||
632 | /* send enable and wait for ack -- don't hold lock when sending enable | |
633 | * because if the queue is full, insert might sleep. | |
634 | */ | |
946b2546 | 635 | napi_enable(&devdata->napi); |
68905a14 DK |
636 | send_enbdis(netdev, 1, devdata); |
637 | ||
638 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
0c677e9c | 639 | while ((timeout == VISORNIC_INFINITE_RSP_WAIT) || |
68905a14 DK |
640 | (wait < timeout)) { |
641 | if (devdata->enab_dis_acked) | |
642 | break; | |
643 | if (devdata->server_down || devdata->server_change_state) { | |
644 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
00748b0c TS |
645 | dev_dbg(&netdev->dev, "%s server went away\n", |
646 | __func__); | |
68905a14 DK |
647 | return -EIO; |
648 | } | |
649 | set_current_state(TASK_INTERRUPTIBLE); | |
650 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
651 | wait += schedule_timeout(msecs_to_jiffies(10)); | |
652 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
653 | } | |
654 | ||
655 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
656 | ||
00748b0c TS |
657 | if (!devdata->enab_dis_acked) { |
658 | dev_err(&netdev->dev, "%s missing ACK\n", __func__); | |
68905a14 | 659 | return -EIO; |
00748b0c | 660 | } |
68905a14 | 661 | |
35a8dd31 | 662 | netif_start_queue(netdev); |
946b2546 | 663 | |
68905a14 DK |
664 | return 0; |
665 | } | |
666 | ||
667 | /** | |
668 | * visornic_timeout_reset - handle xmit timeout resets | |
669 | * @work work item that scheduled the work | |
670 | * | |
671 | * Transmit Timeouts are typically handled by resetting the | |
672 | * device for our virtual NIC we will send a Disable and Enable | |
673 | * to the IOVM. If it doesn't respond we will trigger a serverdown. | |
674 | */ | |
675 | static void | |
676 | visornic_timeout_reset(struct work_struct *work) | |
677 | { | |
678 | struct visornic_devdata *devdata; | |
679 | struct net_device *netdev; | |
680 | int response = 0; | |
681 | ||
682 | devdata = container_of(work, struct visornic_devdata, timeout_reset); | |
683 | netdev = devdata->netdev; | |
684 | ||
4d79002e TS |
685 | rtnl_lock(); |
686 | if (!netif_running(netdev)) { | |
687 | rtnl_unlock(); | |
688 | return; | |
689 | } | |
690 | ||
0c677e9c NH |
691 | response = visornic_disable_with_timeout(netdev, |
692 | VISORNIC_INFINITE_RSP_WAIT); | |
68905a14 DK |
693 | if (response) |
694 | goto call_serverdown; | |
695 | ||
0c677e9c NH |
696 | response = visornic_enable_with_timeout(netdev, |
697 | VISORNIC_INFINITE_RSP_WAIT); | |
68905a14 DK |
698 | if (response) |
699 | goto call_serverdown; | |
68905a14 | 700 | |
4d79002e TS |
701 | rtnl_unlock(); |
702 | ||
68905a14 DK |
703 | return; |
704 | ||
705 | call_serverdown: | |
d01da5ea | 706 | visornic_serverdown(devdata, NULL); |
4d79002e | 707 | rtnl_unlock(); |
68905a14 DK |
708 | } |
709 | ||
710 | /** | |
711 | * visornic_open - Enable the visornic device and mark the queue started | |
712 | * @netdev: netdevice to start | |
713 | * | |
714 | * Enable the device and start the transmit queue. | |
715 | * Return 0 for success | |
716 | */ | |
717 | static int | |
718 | visornic_open(struct net_device *netdev) | |
719 | { | |
0c677e9c | 720 | visornic_enable_with_timeout(netdev, VISORNIC_INFINITE_RSP_WAIT); |
68905a14 | 721 | |
68905a14 DK |
722 | return 0; |
723 | } | |
724 | ||
725 | /** | |
726 | * visornic_close - Disables the visornic device and stops the queues | |
727 | * @netdev: netdevice to start | |
728 | * | |
729 | * Disable the device and stop the transmit queue. | |
730 | * Return 0 for success | |
731 | */ | |
732 | static int | |
733 | visornic_close(struct net_device *netdev) | |
734 | { | |
0c677e9c | 735 | visornic_disable_with_timeout(netdev, VISORNIC_INFINITE_RSP_WAIT); |
68905a14 DK |
736 | |
737 | return 0; | |
738 | } | |
739 | ||
36927c18 TS |
740 | /** |
741 | * devdata_xmits_outstanding - compute outstanding xmits | |
742 | * @devdata: visornic_devdata for device | |
743 | * | |
744 | * Return value is the number of outstanding xmits. | |
745 | */ | |
746 | static unsigned long devdata_xmits_outstanding(struct visornic_devdata *devdata) | |
747 | { | |
748 | if (devdata->chstat.sent_xmit >= devdata->chstat.got_xmit_done) | |
749 | return devdata->chstat.sent_xmit - | |
750 | devdata->chstat.got_xmit_done; | |
6e1edc0f BS |
751 | return (ULONG_MAX - devdata->chstat.got_xmit_done |
752 | + devdata->chstat.sent_xmit + 1); | |
36927c18 TS |
753 | } |
754 | ||
755 | /** | |
756 | * vnic_hit_high_watermark | |
757 | * @devdata: indicates visornic device we are checking | |
758 | * @high_watermark: max num of unacked xmits we will tolerate, | |
759 | * before we will start throttling | |
760 | * | |
761 | * Returns true iff the number of unacked xmits sent to | |
762 | * the IO partition is >= high_watermark. | |
763 | */ | |
764 | static inline bool vnic_hit_high_watermark(struct visornic_devdata *devdata, | |
765 | ulong high_watermark) | |
766 | { | |
767 | return (devdata_xmits_outstanding(devdata) >= high_watermark); | |
768 | } | |
769 | ||
770 | /** | |
771 | * vnic_hit_low_watermark | |
772 | * @devdata: indicates visornic device we are checking | |
773 | * @low_watermark: we will wait until the num of unacked xmits | |
774 | * drops to this value or lower before we start | |
775 | * transmitting again | |
776 | * | |
777 | * Returns true iff the number of unacked xmits sent to | |
778 | * the IO partition is <= low_watermark. | |
779 | */ | |
780 | static inline bool vnic_hit_low_watermark(struct visornic_devdata *devdata, | |
781 | ulong low_watermark) | |
782 | { | |
783 | return (devdata_xmits_outstanding(devdata) <= low_watermark); | |
784 | } | |
785 | ||
68905a14 DK |
786 | /** |
787 | * visornic_xmit - send a packet to the IO Partition | |
788 | * @skb: Packet to be sent | |
789 | * @netdev: net device the packet is being sent from | |
790 | * | |
791 | * Convert the skb to a cmdrsp so the IO Partition can undersand it. | |
792 | * Send the XMIT command to the IO Partition for processing. This | |
793 | * function is protected from concurrent calls by a spinlock xmit_lock | |
794 | * in the net_device struct, but as soon as the function returns it | |
795 | * can be called again. | |
f6346ad6 | 796 | * Returns NETDEV_TX_OK. |
68905a14 DK |
797 | */ |
798 | static int | |
799 | visornic_xmit(struct sk_buff *skb, struct net_device *netdev) | |
800 | { | |
801 | struct visornic_devdata *devdata; | |
802 | int len, firstfraglen, padlen; | |
803 | struct uiscmdrsp *cmdrsp = NULL; | |
804 | unsigned long flags; | |
805 | ||
806 | devdata = netdev_priv(netdev); | |
807 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
808 | ||
809 | if (netif_queue_stopped(netdev) || devdata->server_down || | |
810 | devdata->server_change_state) { | |
811 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
812 | devdata->busy_cnt++; | |
00748b0c TS |
813 | dev_dbg(&netdev->dev, |
814 | "%s busy - queue stopped\n", __func__); | |
f6346ad6 NH |
815 | kfree_skb(skb); |
816 | return NETDEV_TX_OK; | |
68905a14 DK |
817 | } |
818 | ||
819 | /* sk_buff struct is used to host network data throughout all the | |
820 | * linux network subsystems | |
821 | */ | |
822 | len = skb->len; | |
823 | ||
824 | /* skb->len is the FULL length of data (including fragmentary portion) | |
825 | * skb->data_len is the length of the fragment portion in frags | |
826 | * skb->len - skb->data_len is size of the 1st fragment in skb->data | |
827 | * calculate the length of the first fragment that skb->data is | |
828 | * pointing to | |
829 | */ | |
830 | firstfraglen = skb->len - skb->data_len; | |
831 | if (firstfraglen < ETH_HEADER_SIZE) { | |
832 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
833 | devdata->busy_cnt++; | |
00748b0c TS |
834 | dev_err(&netdev->dev, |
835 | "%s busy - first frag too small (%d)\n", | |
836 | __func__, firstfraglen); | |
f6346ad6 NH |
837 | kfree_skb(skb); |
838 | return NETDEV_TX_OK; | |
68905a14 DK |
839 | } |
840 | ||
841 | if ((len < ETH_MIN_PACKET_SIZE) && | |
842 | ((skb_end_pointer(skb) - skb->data) >= ETH_MIN_PACKET_SIZE)) { | |
843 | /* pad the packet out to minimum size */ | |
844 | padlen = ETH_MIN_PACKET_SIZE - len; | |
845 | memset(&skb->data[len], 0, padlen); | |
846 | skb->tail += padlen; | |
847 | skb->len += padlen; | |
848 | len += padlen; | |
849 | firstfraglen += padlen; | |
850 | } | |
851 | ||
852 | cmdrsp = devdata->xmit_cmdrsp; | |
853 | /* clear cmdrsp */ | |
854 | memset(cmdrsp, 0, SIZEOF_CMDRSP); | |
855 | cmdrsp->net.type = NET_XMIT; | |
856 | cmdrsp->cmdtype = CMD_NET_TYPE; | |
857 | ||
858 | /* save the pointer to skb -- we'll need it for completion */ | |
859 | cmdrsp->net.buf = skb; | |
860 | ||
36927c18 TS |
861 | if (vnic_hit_high_watermark(devdata, |
862 | devdata->max_outstanding_net_xmits)) { | |
77c9a4ae | 863 | /* extra NET_XMITs queued over to IOVM - need to wait */ |
68905a14 DK |
864 | devdata->chstat.reject_count++; |
865 | if (!devdata->queuefullmsg_logged && | |
866 | ((devdata->chstat.reject_count & 0x3ff) == 1)) | |
867 | devdata->queuefullmsg_logged = 1; | |
868 | netif_stop_queue(netdev); | |
869 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
870 | devdata->busy_cnt++; | |
00748b0c TS |
871 | dev_dbg(&netdev->dev, |
872 | "%s busy - waiting for iovm to catch up\n", | |
873 | __func__); | |
f6346ad6 NH |
874 | kfree_skb(skb); |
875 | return NETDEV_TX_OK; | |
68905a14 DK |
876 | } |
877 | if (devdata->queuefullmsg_logged) | |
878 | devdata->queuefullmsg_logged = 0; | |
879 | ||
880 | if (skb->ip_summed == CHECKSUM_UNNECESSARY) { | |
881 | cmdrsp->net.xmt.lincsum.valid = 1; | |
882 | cmdrsp->net.xmt.lincsum.protocol = skb->protocol; | |
883 | if (skb_transport_header(skb) > skb->data) { | |
884 | cmdrsp->net.xmt.lincsum.hrawoff = | |
885 | skb_transport_header(skb) - skb->data; | |
886 | cmdrsp->net.xmt.lincsum.hrawoff = 1; | |
887 | } | |
888 | if (skb_network_header(skb) > skb->data) { | |
889 | cmdrsp->net.xmt.lincsum.nhrawoff = | |
890 | skb_network_header(skb) - skb->data; | |
891 | cmdrsp->net.xmt.lincsum.nhrawoffv = 1; | |
892 | } | |
893 | cmdrsp->net.xmt.lincsum.csum = skb->csum; | |
894 | } else { | |
895 | cmdrsp->net.xmt.lincsum.valid = 0; | |
896 | } | |
897 | ||
898 | /* save off the length of the entire data packet */ | |
899 | cmdrsp->net.xmt.len = len; | |
900 | ||
901 | /* copy ethernet header from first frag into ocmdrsp | |
902 | * - everything else will be pass in frags & DMA'ed | |
903 | */ | |
904 | memcpy(cmdrsp->net.xmt.ethhdr, skb->data, ETH_HEADER_SIZE); | |
905 | /* copy frags info - from skb->data we need to only provide access | |
906 | * beyond eth header | |
907 | */ | |
908 | cmdrsp->net.xmt.num_frags = | |
909 | visor_copy_fragsinfo_from_skb(skb, firstfraglen, | |
910 | MAX_PHYS_INFO, | |
911 | cmdrsp->net.xmt.frags); | |
ce657aa8 | 912 | if (cmdrsp->net.xmt.num_frags < 0) { |
68905a14 DK |
913 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
914 | devdata->busy_cnt++; | |
00748b0c TS |
915 | dev_err(&netdev->dev, |
916 | "%s busy - copy frags failed\n", __func__); | |
f6346ad6 NH |
917 | kfree_skb(skb); |
918 | return NETDEV_TX_OK; | |
68905a14 DK |
919 | } |
920 | ||
921 | if (!visorchannel_signalinsert(devdata->dev->visorchannel, | |
922 | IOCHAN_TO_IOPART, cmdrsp)) { | |
923 | netif_stop_queue(netdev); | |
924 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
925 | devdata->busy_cnt++; | |
00748b0c TS |
926 | dev_dbg(&netdev->dev, |
927 | "%s busy - signalinsert failed\n", __func__); | |
f6346ad6 NH |
928 | kfree_skb(skb); |
929 | return NETDEV_TX_OK; | |
68905a14 DK |
930 | } |
931 | ||
932 | /* Track the skbs that have been sent to the IOVM for XMIT */ | |
933 | skb_queue_head(&devdata->xmitbufhead, skb); | |
934 | ||
68905a14 DK |
935 | /* update xmt stats */ |
936 | devdata->net_stats.tx_packets++; | |
937 | devdata->net_stats.tx_bytes += skb->len; | |
938 | devdata->chstat.sent_xmit++; | |
939 | ||
77c9a4ae | 940 | /* check if we have hit the high watermark for netif_stop_queue() */ |
36927c18 TS |
941 | if (vnic_hit_high_watermark(devdata, |
942 | devdata->upper_threshold_net_xmits)) { | |
77c9a4ae EA |
943 | /* extra NET_XMITs queued over to IOVM - need to wait */ |
944 | /* stop queue - call netif_wake_queue() after lower threshold */ | |
945 | netif_stop_queue(netdev); | |
00748b0c TS |
946 | dev_dbg(&netdev->dev, |
947 | "%s busy - invoking iovm flow control\n", | |
948 | __func__); | |
68905a14 DK |
949 | devdata->flow_control_upper_hits++; |
950 | } | |
951 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
952 | ||
953 | /* skb will be freed when we get back NET_XMIT_DONE */ | |
954 | return NETDEV_TX_OK; | |
955 | } | |
956 | ||
957 | /** | |
958 | * visornic_get_stats - returns net_stats of the visornic device | |
959 | * @netdev: netdevice | |
960 | * | |
961 | * Returns the net_device_stats for the device | |
962 | */ | |
963 | static struct net_device_stats * | |
964 | visornic_get_stats(struct net_device *netdev) | |
965 | { | |
966 | struct visornic_devdata *devdata = netdev_priv(netdev); | |
967 | ||
968 | return &devdata->net_stats; | |
969 | } | |
970 | ||
68905a14 DK |
971 | /** |
972 | * visornic_change_mtu - changes mtu of device. | |
973 | * @netdev: netdevice | |
974 | * @new_mtu: value of new mtu | |
975 | * | |
976 | * MTU cannot be changed by system, must be changed via | |
977 | * CONTROLVM message. All vnics and pnics in a switch have | |
978 | * to have the same MTU for everything to work. | |
979 | * Currently not supported. | |
980 | * Returns EINVAL | |
981 | */ | |
982 | static int | |
983 | visornic_change_mtu(struct net_device *netdev, int new_mtu) | |
984 | { | |
985 | return -EINVAL; | |
986 | } | |
987 | ||
988 | /** | |
989 | * visornic_set_multi - changes mtu of device. | |
990 | * @netdev: netdevice | |
991 | * | |
992 | * Only flag we support currently is IFF_PROMISC | |
993 | * Returns void | |
994 | */ | |
995 | static void | |
996 | visornic_set_multi(struct net_device *netdev) | |
997 | { | |
998 | struct uiscmdrsp *cmdrsp; | |
999 | struct visornic_devdata *devdata = netdev_priv(netdev); | |
1000 | ||
6d8c96cb DB |
1001 | if (devdata->old_flags == netdev->flags) |
1002 | return; | |
1003 | ||
1004 | if ((netdev->flags & IFF_PROMISC) == | |
1005 | (devdata->old_flags & IFF_PROMISC)) | |
1006 | goto out_save_flags; | |
1007 | ||
1008 | cmdrsp = kmalloc(SIZEOF_CMDRSP, GFP_ATOMIC); | |
1009 | if (!cmdrsp) | |
1010 | return; | |
1011 | cmdrsp->cmdtype = CMD_NET_TYPE; | |
1012 | cmdrsp->net.type = NET_RCV_PROMISC; | |
1013 | cmdrsp->net.enbdis.context = netdev; | |
1014 | cmdrsp->net.enbdis.enable = | |
1015 | netdev->flags & IFF_PROMISC; | |
1016 | visorchannel_signalinsert(devdata->dev->visorchannel, | |
1017 | IOCHAN_TO_IOPART, | |
1018 | cmdrsp); | |
1019 | kfree(cmdrsp); | |
1020 | ||
1021 | out_save_flags: | |
1022 | devdata->old_flags = netdev->flags; | |
68905a14 DK |
1023 | } |
1024 | ||
1025 | /** | |
1026 | * visornic_xmit_timeout - request to timeout the xmit | |
1027 | * @netdev | |
1028 | * | |
1029 | * Queue the work and return. Make sure we have not already | |
1030 | * been informed the IO Partition is gone, if it is gone | |
1031 | * we will already timeout the xmits. | |
1032 | */ | |
1033 | static void | |
1034 | visornic_xmit_timeout(struct net_device *netdev) | |
1035 | { | |
1036 | struct visornic_devdata *devdata = netdev_priv(netdev); | |
1037 | unsigned long flags; | |
1038 | ||
1039 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
46df8226 TS |
1040 | if (devdata->going_away) { |
1041 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1042 | dev_dbg(&devdata->dev->device, | |
1043 | "%s aborting because device removal pending\n", | |
1044 | __func__); | |
1045 | return; | |
1046 | } | |
1047 | ||
68905a14 DK |
1048 | /* Ensure that a ServerDown message hasn't been received */ |
1049 | if (!devdata->enabled || | |
1050 | (devdata->server_down && !devdata->server_change_state)) { | |
00748b0c TS |
1051 | dev_dbg(&netdev->dev, "%s no processing\n", |
1052 | __func__); | |
68905a14 DK |
1053 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
1054 | return; | |
1055 | } | |
ce388d7e | 1056 | schedule_work(&devdata->timeout_reset); |
46df8226 | 1057 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
68905a14 DK |
1058 | } |
1059 | ||
1060 | /** | |
1061 | * repost_return - repost rcv bufs that have come back | |
1062 | * @cmdrsp: io channel command struct to post | |
1063 | * @devdata: visornic devdata for the device | |
1064 | * @skb: skb | |
1065 | * @netdev: netdevice | |
1066 | * | |
1067 | * Repost rcv buffers that have been returned to us when | |
1068 | * we are finished with them. | |
1069 | * Returns 0 for success, -1 for error. | |
1070 | */ | |
1071 | static inline int | |
1072 | repost_return(struct uiscmdrsp *cmdrsp, struct visornic_devdata *devdata, | |
1073 | struct sk_buff *skb, struct net_device *netdev) | |
1074 | { | |
1075 | struct net_pkt_rcv copy; | |
1076 | int i = 0, cc, numreposted; | |
1077 | int found_skb = 0; | |
1078 | int status = 0; | |
1079 | ||
1080 | copy = cmdrsp->net.rcv; | |
1081 | switch (copy.numrcvbufs) { | |
1082 | case 0: | |
1083 | devdata->n_rcv0++; | |
1084 | break; | |
1085 | case 1: | |
1086 | devdata->n_rcv1++; | |
1087 | break; | |
1088 | case 2: | |
1089 | devdata->n_rcv2++; | |
1090 | break; | |
1091 | default: | |
1092 | devdata->n_rcvx++; | |
1093 | break; | |
1094 | } | |
1095 | for (cc = 0, numreposted = 0; cc < copy.numrcvbufs; cc++) { | |
1096 | for (i = 0; i < devdata->num_rcv_bufs; i++) { | |
1097 | if (devdata->rcvbuf[i] != copy.rcvbuf[cc]) | |
1098 | continue; | |
1099 | ||
1100 | if ((skb) && devdata->rcvbuf[i] == skb) { | |
1101 | devdata->found_repost_rcvbuf_cnt++; | |
1102 | found_skb = 1; | |
1103 | devdata->repost_found_skb_cnt++; | |
1104 | } | |
1105 | devdata->rcvbuf[i] = alloc_rcv_buf(netdev); | |
1106 | if (!devdata->rcvbuf[i]) { | |
1107 | devdata->num_rcv_bufs_could_not_alloc++; | |
1108 | devdata->alloc_failed_in_repost_rtn_cnt++; | |
1109 | status = -ENOMEM; | |
1110 | break; | |
1111 | } | |
1112 | post_skb(cmdrsp, devdata, devdata->rcvbuf[i]); | |
1113 | numreposted++; | |
1114 | break; | |
1115 | } | |
1116 | } | |
1117 | if (numreposted != copy.numrcvbufs) { | |
1118 | devdata->n_repost_deficit++; | |
1119 | status = -EINVAL; | |
1120 | } | |
1121 | if (skb) { | |
1122 | if (found_skb) { | |
1123 | kfree_skb(skb); | |
1124 | } else { | |
1125 | status = -EINVAL; | |
1126 | devdata->bad_rcv_buf++; | |
1127 | } | |
1128 | } | |
68905a14 DK |
1129 | return status; |
1130 | } | |
1131 | ||
1132 | /** | |
1133 | * visornic_rx - Handle receive packets coming back from IO Part | |
1134 | * @cmdrsp: Receive packet returned from IO Part | |
1135 | * | |
1136 | * Got a receive packet back from the IO Part, handle it and send | |
1137 | * it up the stack. | |
73e81350 | 1138 | * Returns 1 iff an skb was receieved, otherwise 0 |
68905a14 | 1139 | */ |
946b2546 | 1140 | static int |
68905a14 DK |
1141 | visornic_rx(struct uiscmdrsp *cmdrsp) |
1142 | { | |
1143 | struct visornic_devdata *devdata; | |
1144 | struct sk_buff *skb, *prev, *curr; | |
1145 | struct net_device *netdev; | |
946b2546 | 1146 | int cc, currsize, off; |
68905a14 DK |
1147 | struct ethhdr *eth; |
1148 | unsigned long flags; | |
68905a14 DK |
1149 | |
1150 | /* post new rcv buf to the other end using the cmdrsp we have at hand | |
1151 | * post it without holding lock - but we'll use the signal lock to | |
1152 | * synchronize the queue insert the cmdrsp that contains the net.rcv | |
1153 | * is the one we are using to repost, so copy the info we need from it. | |
1154 | */ | |
1155 | skb = cmdrsp->net.buf; | |
1156 | netdev = skb->dev; | |
1157 | ||
68905a14 DK |
1158 | devdata = netdev_priv(netdev); |
1159 | ||
1160 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
1161 | atomic_dec(&devdata->num_rcvbuf_in_iovm); | |
1162 | ||
68905a14 DK |
1163 | /* set length to how much was ACTUALLY received - |
1164 | * NOTE: rcv_done_len includes actual length of data rcvd | |
1165 | * including ethhdr | |
1166 | */ | |
1167 | skb->len = cmdrsp->net.rcv.rcv_done_len; | |
1168 | ||
f6b6a8ec DK |
1169 | /* update rcv stats - call it with priv_lock held */ |
1170 | devdata->net_stats.rx_packets++; | |
1171 | devdata->net_stats.rx_bytes += skb->len; | |
1172 | ||
68905a14 DK |
1173 | /* test enabled while holding lock */ |
1174 | if (!(devdata->enabled && devdata->enab_dis_acked)) { | |
1175 | /* don't process it unless we're in enable mode and until | |
1176 | * we've gotten an ACK saying the other end got our RCV enable | |
1177 | */ | |
1178 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1179 | repost_return(cmdrsp, devdata, skb, netdev); | |
73e81350 | 1180 | return 0; |
68905a14 DK |
1181 | } |
1182 | ||
1183 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1184 | ||
1185 | /* when skb was allocated, skb->dev, skb->data, skb->len and | |
1186 | * skb->data_len were setup. AND, data has already put into the | |
1187 | * skb (both first frag and in frags pages) | |
1188 | * NOTE: firstfragslen is the amount of data in skb->data and that | |
1189 | * which is not in nr_frags or frag_list. This is now simply | |
1190 | * RCVPOST_BUF_SIZE. bump tail to show how much data is in | |
1191 | * firstfrag & set data_len to show rest see if we have to chain | |
1192 | * frag_list. | |
1193 | */ | |
1194 | if (skb->len > RCVPOST_BUF_SIZE) { /* do PRECAUTIONARY check */ | |
1195 | if (cmdrsp->net.rcv.numrcvbufs < 2) { | |
1196 | if (repost_return(cmdrsp, devdata, skb, netdev) < 0) | |
1197 | dev_err(&devdata->netdev->dev, | |
1198 | "repost_return failed"); | |
73e81350 | 1199 | return 0; |
68905a14 DK |
1200 | } |
1201 | /* length rcvd is greater than firstfrag in this skb rcv buf */ | |
1202 | skb->tail += RCVPOST_BUF_SIZE; /* amount in skb->data */ | |
1203 | skb->data_len = skb->len - RCVPOST_BUF_SIZE; /* amount that | |
abbceb61 EA |
1204 | * will be in |
1205 | * frag_list | |
1206 | */ | |
68905a14 DK |
1207 | } else { |
1208 | /* data fits in this skb - no chaining - do | |
1209 | * PRECAUTIONARY check | |
1210 | */ | |
1211 | if (cmdrsp->net.rcv.numrcvbufs != 1) { /* should be 1 */ | |
1212 | if (repost_return(cmdrsp, devdata, skb, netdev) < 0) | |
1213 | dev_err(&devdata->netdev->dev, | |
1214 | "repost_return failed"); | |
73e81350 | 1215 | return 0; |
68905a14 DK |
1216 | } |
1217 | skb->tail += skb->len; | |
1218 | skb->data_len = 0; /* nothing rcvd in frag_list */ | |
1219 | } | |
1220 | off = skb_tail_pointer(skb) - skb->data; | |
1221 | ||
1222 | /* amount we bumped tail by in the head skb | |
1223 | * it is used to calculate the size of each chained skb below | |
1224 | * it is also used to index into bufline to continue the copy | |
1225 | * (for chansocktwopc) | |
1226 | * if necessary chain the rcv skbs together. | |
1227 | * NOTE: index 0 has the same as cmdrsp->net.rcv.skb; we need to | |
1228 | * chain the rest to that one. | |
1229 | * - do PRECAUTIONARY check | |
1230 | */ | |
1231 | if (cmdrsp->net.rcv.rcvbuf[0] != skb) { | |
1232 | if (repost_return(cmdrsp, devdata, skb, netdev) < 0) | |
1233 | dev_err(&devdata->netdev->dev, "repost_return failed"); | |
73e81350 | 1234 | return 0; |
68905a14 DK |
1235 | } |
1236 | ||
1237 | if (cmdrsp->net.rcv.numrcvbufs > 1) { | |
1238 | /* chain the various rcv buffers into the skb's frag_list. */ | |
1239 | /* Note: off was initialized above */ | |
1240 | for (cc = 1, prev = NULL; | |
1241 | cc < cmdrsp->net.rcv.numrcvbufs; cc++) { | |
1242 | curr = (struct sk_buff *)cmdrsp->net.rcv.rcvbuf[cc]; | |
1243 | curr->next = NULL; | |
1244 | if (!prev) /* start of list- set head */ | |
1245 | skb_shinfo(skb)->frag_list = curr; | |
1246 | else | |
1247 | prev->next = curr; | |
1248 | prev = curr; | |
1249 | ||
1250 | /* should we set skb->len and skb->data_len for each | |
1251 | * buffer being chained??? can't hurt! | |
1252 | */ | |
1253 | currsize = min(skb->len - off, | |
1254 | (unsigned int)RCVPOST_BUF_SIZE); | |
1255 | curr->len = currsize; | |
1256 | curr->tail += currsize; | |
1257 | curr->data_len = 0; | |
1258 | off += currsize; | |
1259 | } | |
68905a14 DK |
1260 | /* assert skb->len == off */ |
1261 | if (skb->len != off) { | |
cb84fca0 TS |
1262 | netdev_err(devdata->netdev, |
1263 | "something wrong; skb->len:%d != off:%d\n", | |
1264 | skb->len, off); | |
68905a14 | 1265 | } |
68905a14 DK |
1266 | } |
1267 | ||
1268 | /* set up packet's protocl type using ethernet header - this | |
1269 | * sets up skb->pkt_type & it also PULLS out the eth header | |
1270 | */ | |
1271 | skb->protocol = eth_type_trans(skb, netdev); | |
1272 | ||
1273 | eth = eth_hdr(skb); | |
1274 | ||
1275 | skb->csum = 0; | |
1276 | skb->ip_summed = CHECKSUM_NONE; | |
1277 | ||
1278 | do { | |
1279 | if (netdev->flags & IFF_PROMISC) | |
1280 | break; /* accept all packets */ | |
1281 | if (skb->pkt_type == PACKET_BROADCAST) { | |
1282 | if (netdev->flags & IFF_BROADCAST) | |
1283 | break; /* accept all broadcast packets */ | |
1284 | } else if (skb->pkt_type == PACKET_MULTICAST) { | |
1285 | if ((netdev->flags & IFF_MULTICAST) && | |
1286 | (netdev_mc_count(netdev))) { | |
1287 | struct netdev_hw_addr *ha; | |
1288 | int found_mc = 0; | |
1289 | ||
1290 | /* only accept multicast packets that we can | |
1291 | * find in our multicast address list | |
1292 | */ | |
1293 | netdev_for_each_mc_addr(ha, netdev) { | |
1294 | if (ether_addr_equal(eth->h_dest, | |
1295 | ha->addr)) { | |
1296 | found_mc = 1; | |
1297 | break; | |
1298 | } | |
1299 | } | |
77c9a4ae | 1300 | /* accept pkt, dest matches a multicast addr */ |
68905a14 | 1301 | if (found_mc) |
77c9a4ae | 1302 | break; |
68905a14 | 1303 | } |
77c9a4ae | 1304 | /* accept packet, h_dest must match vnic mac address */ |
68905a14 | 1305 | } else if (skb->pkt_type == PACKET_HOST) { |
77c9a4ae | 1306 | break; |
68905a14 DK |
1307 | } else if (skb->pkt_type == PACKET_OTHERHOST) { |
1308 | /* something is not right */ | |
1309 | dev_err(&devdata->netdev->dev, | |
1310 | "**** FAILED to deliver rcv packet to OS; name:%s Dest:%pM VNIC:%pM\n", | |
1311 | netdev->name, eth->h_dest, netdev->dev_addr); | |
1312 | } | |
1313 | /* drop packet - don't forward it up to OS */ | |
1314 | devdata->n_rcv_packets_not_accepted++; | |
1315 | repost_return(cmdrsp, devdata, skb, netdev); | |
73e81350 | 1316 | return 0; |
68905a14 DK |
1317 | } while (0); |
1318 | ||
946b2546 | 1319 | netif_receive_skb(skb); |
68905a14 DK |
1320 | /* netif_rx returns various values, but "in practice most drivers |
1321 | * ignore the return value | |
1322 | */ | |
1323 | ||
1324 | skb = NULL; | |
1325 | /* | |
1326 | * whether the packet got dropped or handled, the skb is freed by | |
1327 | * kernel code, so we shouldn't free it. but we should repost a | |
1328 | * new rcv buffer. | |
1329 | */ | |
1330 | repost_return(cmdrsp, devdata, skb, netdev); | |
73e81350 | 1331 | return 1; |
68905a14 DK |
1332 | } |
1333 | ||
1334 | /** | |
1335 | * devdata_initialize - Initialize devdata structure | |
1336 | * @devdata: visornic_devdata structure to initialize | |
1337 | * #dev: visorbus_deviced it belongs to | |
1338 | * | |
1339 | * Setup initial values for the visornic based on channel and default | |
1340 | * values. | |
e1834bd0 | 1341 | * Returns a pointer to the devdata structure |
68905a14 DK |
1342 | */ |
1343 | static struct visornic_devdata * | |
1344 | devdata_initialize(struct visornic_devdata *devdata, struct visor_device *dev) | |
1345 | { | |
68905a14 | 1346 | devdata->dev = dev; |
91678f37 | 1347 | devdata->incarnation_id = get_jiffies_64(); |
68905a14 DK |
1348 | return devdata; |
1349 | } | |
1350 | ||
1351 | /** | |
8d0119d8 TS |
1352 | * devdata_release - Frees up references in devdata |
1353 | * @devdata: struct to clean up | |
68905a14 | 1354 | * |
8d0119d8 | 1355 | * Frees up references in devdata. |
68905a14 DK |
1356 | * Returns void |
1357 | */ | |
8d0119d8 | 1358 | static void devdata_release(struct visornic_devdata *devdata) |
68905a14 | 1359 | { |
46df8226 TS |
1360 | kfree(devdata->rcvbuf); |
1361 | kfree(devdata->cmdrsp_rcv); | |
1362 | kfree(devdata->xmit_cmdrsp); | |
68905a14 DK |
1363 | } |
1364 | ||
1365 | static const struct net_device_ops visornic_dev_ops = { | |
1366 | .ndo_open = visornic_open, | |
1367 | .ndo_stop = visornic_close, | |
1368 | .ndo_start_xmit = visornic_xmit, | |
1369 | .ndo_get_stats = visornic_get_stats, | |
68905a14 DK |
1370 | .ndo_change_mtu = visornic_change_mtu, |
1371 | .ndo_tx_timeout = visornic_xmit_timeout, | |
1372 | .ndo_set_rx_mode = visornic_set_multi, | |
1373 | }; | |
1374 | ||
52b1660d NH |
1375 | /* DebugFS code */ |
1376 | static ssize_t info_debugfs_read(struct file *file, char __user *buf, | |
1377 | size_t len, loff_t *offset) | |
1378 | { | |
1379 | ssize_t bytes_read = 0; | |
1380 | int str_pos = 0; | |
1381 | struct visornic_devdata *devdata; | |
1382 | struct net_device *dev; | |
1383 | char *vbuf; | |
1384 | ||
1385 | if (len > MAX_BUF) | |
1386 | len = MAX_BUF; | |
1387 | vbuf = kzalloc(len, GFP_KERNEL); | |
1388 | if (!vbuf) | |
1389 | return -ENOMEM; | |
1390 | ||
77c9a4ae | 1391 | /* for each vnic channel dump out channel specific data */ |
52b1660d NH |
1392 | rcu_read_lock(); |
1393 | for_each_netdev_rcu(current->nsproxy->net_ns, dev) { | |
77c9a4ae | 1394 | /* Only consider netdevs that are visornic, and are open */ |
52b1660d NH |
1395 | if ((dev->netdev_ops != &visornic_dev_ops) || |
1396 | (!netif_queue_stopped(dev))) | |
1397 | continue; | |
1398 | ||
1399 | devdata = netdev_priv(dev); | |
1400 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1401 | "netdev = %s (0x%p), MAC Addr %pM\n", | |
1402 | dev->name, | |
1403 | dev, | |
1404 | dev->dev_addr); | |
1405 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1406 | "VisorNic Dev Info = 0x%p\n", devdata); | |
1407 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1408 | " num_rcv_bufs = %d\n", | |
1409 | devdata->num_rcv_bufs); | |
1410 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
36927c18 | 1411 | " max_oustanding_next_xmits = %lu\n", |
52b1660d NH |
1412 | devdata->max_outstanding_net_xmits); |
1413 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
36927c18 | 1414 | " upper_threshold_net_xmits = %lu\n", |
52b1660d NH |
1415 | devdata->upper_threshold_net_xmits); |
1416 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
36927c18 | 1417 | " lower_threshold_net_xmits = %lu\n", |
52b1660d NH |
1418 | devdata->lower_threshold_net_xmits); |
1419 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1420 | " queuefullmsg_logged = %d\n", | |
1421 | devdata->queuefullmsg_logged); | |
1422 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1423 | " chstat.got_rcv = %lu\n", | |
1424 | devdata->chstat.got_rcv); | |
1425 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1426 | " chstat.got_enbdisack = %lu\n", | |
1427 | devdata->chstat.got_enbdisack); | |
1428 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1429 | " chstat.got_xmit_done = %lu\n", | |
1430 | devdata->chstat.got_xmit_done); | |
1431 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1432 | " chstat.xmit_fail = %lu\n", | |
1433 | devdata->chstat.xmit_fail); | |
1434 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1435 | " chstat.sent_enbdis = %lu\n", | |
1436 | devdata->chstat.sent_enbdis); | |
1437 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1438 | " chstat.sent_promisc = %lu\n", | |
1439 | devdata->chstat.sent_promisc); | |
1440 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1441 | " chstat.sent_post = %lu\n", | |
1442 | devdata->chstat.sent_post); | |
81d275c6 TS |
1443 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, |
1444 | " chstat.sent_post_failed = %lu\n", | |
1445 | devdata->chstat.sent_post_failed); | |
52b1660d NH |
1446 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, |
1447 | " chstat.sent_xmit = %lu\n", | |
1448 | devdata->chstat.sent_xmit); | |
1449 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1450 | " chstat.reject_count = %lu\n", | |
1451 | devdata->chstat.reject_count); | |
1452 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1453 | " chstat.extra_rcvbufs_sent = %lu\n", | |
1454 | devdata->chstat.extra_rcvbufs_sent); | |
1455 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1456 | " n_rcv0 = %lu\n", devdata->n_rcv0); | |
1457 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1458 | " n_rcv1 = %lu\n", devdata->n_rcv1); | |
1459 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1460 | " n_rcv2 = %lu\n", devdata->n_rcv2); | |
1461 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1462 | " n_rcvx = %lu\n", devdata->n_rcvx); | |
1463 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1464 | " num_rcvbuf_in_iovm = %d\n", | |
1465 | atomic_read(&devdata->num_rcvbuf_in_iovm)); | |
1466 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1467 | " alloc_failed_in_if_needed_cnt = %lu\n", | |
1468 | devdata->alloc_failed_in_if_needed_cnt); | |
1469 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1470 | " alloc_failed_in_repost_rtn_cnt = %lu\n", | |
1471 | devdata->alloc_failed_in_repost_rtn_cnt); | |
1472 | /* str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1473 | * " inner_loop_limit_reached_cnt = %lu\n", | |
1474 | * devdata->inner_loop_limit_reached_cnt); | |
1475 | */ | |
1476 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1477 | " found_repost_rcvbuf_cnt = %lu\n", | |
1478 | devdata->found_repost_rcvbuf_cnt); | |
1479 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1480 | " repost_found_skb_cnt = %lu\n", | |
1481 | devdata->repost_found_skb_cnt); | |
1482 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1483 | " n_repost_deficit = %lu\n", | |
1484 | devdata->n_repost_deficit); | |
1485 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1486 | " bad_rcv_buf = %lu\n", | |
1487 | devdata->bad_rcv_buf); | |
1488 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1489 | " n_rcv_packets_not_accepted = %lu\n", | |
1490 | devdata->n_rcv_packets_not_accepted); | |
1491 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1492 | " interrupts_rcvd = %llu\n", | |
1493 | devdata->interrupts_rcvd); | |
1494 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1495 | " interrupts_notme = %llu\n", | |
1496 | devdata->interrupts_notme); | |
1497 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1498 | " interrupts_disabled = %llu\n", | |
1499 | devdata->interrupts_disabled); | |
1500 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1501 | " busy_cnt = %llu\n", | |
1502 | devdata->busy_cnt); | |
1503 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1504 | " flow_control_upper_hits = %llu\n", | |
1505 | devdata->flow_control_upper_hits); | |
1506 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1507 | " flow_control_lower_hits = %llu\n", | |
1508 | devdata->flow_control_lower_hits); | |
52b1660d NH |
1509 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, |
1510 | " netif_queue = %s\n", | |
1511 | netif_queue_stopped(devdata->netdev) ? | |
1512 | "stopped" : "running"); | |
36927c18 TS |
1513 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, |
1514 | " xmits_outstanding = %lu\n", | |
1515 | devdata_xmits_outstanding(devdata)); | |
52b1660d NH |
1516 | } |
1517 | rcu_read_unlock(); | |
1518 | bytes_read = simple_read_from_buffer(buf, len, offset, vbuf, str_pos); | |
1519 | kfree(vbuf); | |
1520 | return bytes_read; | |
1521 | } | |
1522 | ||
68905a14 DK |
1523 | /** |
1524 | * send_rcv_posts_if_needed | |
1525 | * @devdata: visornic device | |
1526 | * | |
1527 | * Send receive buffers to the IO Partition. | |
1528 | * Returns void | |
1529 | */ | |
1530 | static void | |
1531 | send_rcv_posts_if_needed(struct visornic_devdata *devdata) | |
1532 | { | |
1533 | int i; | |
1534 | struct net_device *netdev; | |
1535 | struct uiscmdrsp *cmdrsp = devdata->cmdrsp_rcv; | |
1536 | int cur_num_rcv_bufs_to_alloc, rcv_bufs_allocated; | |
1537 | ||
1538 | /* don't do this until vnic is marked ready */ | |
1539 | if (!(devdata->enabled && devdata->enab_dis_acked)) | |
1540 | return; | |
1541 | ||
1542 | netdev = devdata->netdev; | |
1543 | rcv_bufs_allocated = 0; | |
1544 | /* this code is trying to prevent getting stuck here forever, | |
1545 | * but still retry it if you cant allocate them all this time. | |
1546 | */ | |
1547 | cur_num_rcv_bufs_to_alloc = devdata->num_rcv_bufs_could_not_alloc; | |
1548 | while (cur_num_rcv_bufs_to_alloc > 0) { | |
1549 | cur_num_rcv_bufs_to_alloc--; | |
1550 | for (i = 0; i < devdata->num_rcv_bufs; i++) { | |
1551 | if (devdata->rcvbuf[i]) | |
1552 | continue; | |
1553 | devdata->rcvbuf[i] = alloc_rcv_buf(netdev); | |
1554 | if (!devdata->rcvbuf[i]) { | |
1555 | devdata->alloc_failed_in_if_needed_cnt++; | |
1556 | break; | |
1557 | } | |
1558 | rcv_bufs_allocated++; | |
1559 | post_skb(cmdrsp, devdata, devdata->rcvbuf[i]); | |
1560 | devdata->chstat.extra_rcvbufs_sent++; | |
1561 | } | |
1562 | } | |
1563 | devdata->num_rcv_bufs_could_not_alloc -= rcv_bufs_allocated; | |
1564 | } | |
1565 | ||
1566 | /** | |
91678f37 TS |
1567 | * drain_resp_queue - drains and ignores all messages from the resp queue |
1568 | * @cmdrsp: io channel command response message | |
1569 | * @devdata: visornic device to drain | |
1570 | */ | |
1571 | static void | |
1572 | drain_resp_queue(struct uiscmdrsp *cmdrsp, struct visornic_devdata *devdata) | |
1573 | { | |
1574 | while (visorchannel_signalremove(devdata->dev->visorchannel, | |
1575 | IOCHAN_FROM_IOPART, | |
1576 | cmdrsp)) | |
1577 | ; | |
1578 | } | |
1579 | ||
1580 | /** | |
1581 | * service_resp_queue - drains the response queue | |
68905a14 DK |
1582 | * @cmdrsp: io channel command response message |
1583 | * @devdata: visornic device to drain | |
1584 | * | |
1585 | * Drain the respones queue of any responses from the IO partition. | |
1586 | * Process the responses as we get them. | |
ab301265 | 1587 | * Returns when response queue is empty or when the thread stops. |
68905a14 DK |
1588 | */ |
1589 | static void | |
946b2546 | 1590 | service_resp_queue(struct uiscmdrsp *cmdrsp, struct visornic_devdata *devdata, |
61dd330a | 1591 | int *rx_work_done, int budget) |
68905a14 DK |
1592 | { |
1593 | unsigned long flags; | |
1594 | struct net_device *netdev; | |
1595 | ||
61dd330a | 1596 | while (*rx_work_done < budget) { |
abbceb61 EA |
1597 | /* TODO: CLIENT ACQUIRE -- Don't really need this at the |
1598 | * moment | |
1599 | */ | |
7c03621a DK |
1600 | if (!visorchannel_signalremove(devdata->dev->visorchannel, |
1601 | IOCHAN_FROM_IOPART, | |
1602 | cmdrsp)) | |
1603 | break; /* queue empty */ | |
1604 | ||
1605 | switch (cmdrsp->net.type) { | |
1606 | case NET_RCV: | |
1607 | devdata->chstat.got_rcv++; | |
1608 | /* process incoming packet */ | |
946b2546 | 1609 | *rx_work_done += visornic_rx(cmdrsp); |
7c03621a DK |
1610 | break; |
1611 | case NET_XMIT_DONE: | |
1612 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
1613 | devdata->chstat.got_xmit_done++; | |
1614 | if (cmdrsp->net.xmtdone.xmt_done_result) | |
1615 | devdata->chstat.xmit_fail++; | |
1616 | /* only call queue wake if we stopped it */ | |
1617 | netdev = ((struct sk_buff *)cmdrsp->net.buf)->dev; | |
1618 | /* ASSERT netdev == vnicinfo->netdev; */ | |
1619 | if ((netdev == devdata->netdev) && | |
1620 | netif_queue_stopped(netdev)) { | |
77c9a4ae EA |
1621 | /* check if we have crossed the lower watermark |
1622 | * for netif_wake_queue() | |
68905a14 | 1623 | */ |
dc38082f TS |
1624 | if (vnic_hit_low_watermark |
1625 | (devdata, | |
1626 | devdata->lower_threshold_net_xmits)) { | |
7c03621a DK |
1627 | /* enough NET_XMITs completed |
1628 | * so can restart netif queue | |
1629 | */ | |
1630 | netif_wake_queue(netdev); | |
1631 | devdata->flow_control_lower_hits++; | |
1632 | } | |
68905a14 | 1633 | } |
7c03621a DK |
1634 | skb_unlink(cmdrsp->net.buf, &devdata->xmitbufhead); |
1635 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1636 | kfree_skb(cmdrsp->net.buf); | |
68905a14 | 1637 | break; |
7c03621a DK |
1638 | case NET_RCV_ENBDIS_ACK: |
1639 | devdata->chstat.got_enbdisack++; | |
1640 | netdev = (struct net_device *) | |
1641 | cmdrsp->net.enbdis.context; | |
87a9404e | 1642 | spin_lock_irqsave(&devdata->priv_lock, flags); |
7c03621a DK |
1643 | devdata->enab_dis_acked = 1; |
1644 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1645 | ||
7c03621a DK |
1646 | if (devdata->server_down && |
1647 | devdata->server_change_state) { | |
1648 | /* Inform Linux that the link is up */ | |
1649 | devdata->server_down = false; | |
1650 | devdata->server_change_state = false; | |
1651 | netif_wake_queue(netdev); | |
1652 | netif_carrier_on(netdev); | |
1653 | } | |
1654 | break; | |
1655 | case NET_CONNECT_STATUS: | |
1656 | netdev = devdata->netdev; | |
1657 | if (cmdrsp->net.enbdis.enable == 1) { | |
1658 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
1659 | devdata->enabled = cmdrsp->net.enbdis.enable; | |
1660 | spin_unlock_irqrestore(&devdata->priv_lock, | |
1661 | flags); | |
1662 | netif_wake_queue(netdev); | |
1663 | netif_carrier_on(netdev); | |
1664 | } else { | |
1665 | netif_stop_queue(netdev); | |
1666 | netif_carrier_off(netdev); | |
1667 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
1668 | devdata->enabled = cmdrsp->net.enbdis.enable; | |
1669 | spin_unlock_irqrestore(&devdata->priv_lock, | |
1670 | flags); | |
1671 | } | |
1672 | break; | |
1673 | default: | |
1674 | break; | |
87a9404e | 1675 | } |
7c03621a | 1676 | /* cmdrsp is now available for reuse */ |
68905a14 DK |
1677 | } |
1678 | } | |
1679 | ||
946b2546 NH |
1680 | static int visornic_poll(struct napi_struct *napi, int budget) |
1681 | { | |
1682 | struct visornic_devdata *devdata = container_of(napi, | |
1683 | struct visornic_devdata, | |
1684 | napi); | |
1685 | int rx_count = 0; | |
1686 | ||
1687 | send_rcv_posts_if_needed(devdata); | |
61dd330a | 1688 | service_resp_queue(devdata->cmdrsp, devdata, &rx_count, budget); |
946b2546 | 1689 | |
77c9a4ae | 1690 | /* If there aren't any more packets to receive stop the poll */ |
946b2546 NH |
1691 | if (rx_count < budget) |
1692 | napi_complete(napi); | |
1693 | ||
1694 | return rx_count; | |
1695 | } | |
1696 | ||
68905a14 | 1697 | /** |
946b2546 | 1698 | * poll_for_irq - Checks the status of the response queue. |
68905a14 DK |
1699 | * @v: void pointer to the visronic devdata |
1700 | * | |
1701 | * Main function of the vnic_incoming thread. Peridocially check the | |
1702 | * response queue and drain it if needed. | |
1703 | * Returns when thread has stopped. | |
1704 | */ | |
946b2546 NH |
1705 | static void |
1706 | poll_for_irq(unsigned long v) | |
68905a14 | 1707 | { |
946b2546 | 1708 | struct visornic_devdata *devdata = (struct visornic_devdata *)v; |
68905a14 | 1709 | |
946b2546 NH |
1710 | if (!visorchannel_signalempty( |
1711 | devdata->dev->visorchannel, | |
1712 | IOCHAN_FROM_IOPART)) | |
1713 | napi_schedule(&devdata->napi); | |
68905a14 | 1714 | |
946b2546 | 1715 | atomic_set(&devdata->interrupt_rcvd, 0); |
68905a14 | 1716 | |
946b2546 | 1717 | mod_timer(&devdata->irq_poll_timer, msecs_to_jiffies(2)); |
68905a14 DK |
1718 | } |
1719 | ||
1720 | /** | |
1721 | * visornic_probe - probe function for visornic devices | |
1722 | * @dev: The visor device discovered | |
1723 | * | |
1724 | * Called when visorbus discovers a visornic device on its | |
1725 | * bus. It creates a new visornic ethernet adapter. | |
1726 | * Returns 0 or negative for error. | |
1727 | */ | |
1728 | static int visornic_probe(struct visor_device *dev) | |
1729 | { | |
1730 | struct visornic_devdata *devdata = NULL; | |
1731 | struct net_device *netdev = NULL; | |
1732 | int err; | |
1733 | int channel_offset = 0; | |
1734 | u64 features; | |
1735 | ||
1736 | netdev = alloc_etherdev(sizeof(struct visornic_devdata)); | |
00748b0c TS |
1737 | if (!netdev) { |
1738 | dev_err(&dev->device, | |
1739 | "%s alloc_etherdev failed\n", __func__); | |
68905a14 | 1740 | return -ENOMEM; |
00748b0c | 1741 | } |
68905a14 DK |
1742 | |
1743 | netdev->netdev_ops = &visornic_dev_ops; | |
90cb147f | 1744 | netdev->watchdog_timeo = 5 * HZ; |
051e9fbb | 1745 | SET_NETDEV_DEV(netdev, &dev->device); |
68905a14 DK |
1746 | |
1747 | /* Get MAC adddress from channel and read it into the device. */ | |
1748 | netdev->addr_len = ETH_ALEN; | |
1749 | channel_offset = offsetof(struct spar_io_channel_protocol, | |
1750 | vnic.macaddr); | |
1751 | err = visorbus_read_channel(dev, channel_offset, netdev->dev_addr, | |
1752 | ETH_ALEN); | |
00748b0c TS |
1753 | if (err < 0) { |
1754 | dev_err(&dev->device, | |
1755 | "%s failed to get mac addr from chan (%d)\n", | |
1756 | __func__, err); | |
68905a14 | 1757 | goto cleanup_netdev; |
00748b0c | 1758 | } |
68905a14 DK |
1759 | |
1760 | devdata = devdata_initialize(netdev_priv(netdev), dev); | |
1761 | if (!devdata) { | |
00748b0c TS |
1762 | dev_err(&dev->device, |
1763 | "%s devdata_initialize failed\n", __func__); | |
68905a14 DK |
1764 | err = -ENOMEM; |
1765 | goto cleanup_netdev; | |
1766 | } | |
91678f37 TS |
1767 | /* don't trust messages laying around in the channel */ |
1768 | drain_resp_queue(devdata->cmdrsp, devdata); | |
68905a14 DK |
1769 | |
1770 | devdata->netdev = netdev; | |
5deeea33 | 1771 | dev_set_drvdata(&dev->device, devdata); |
68905a14 DK |
1772 | init_waitqueue_head(&devdata->rsp_queue); |
1773 | spin_lock_init(&devdata->priv_lock); | |
1774 | devdata->enabled = 0; /* not yet */ | |
1775 | atomic_set(&devdata->usage, 1); | |
1776 | ||
1777 | /* Setup rcv bufs */ | |
1778 | channel_offset = offsetof(struct spar_io_channel_protocol, | |
1779 | vnic.num_rcv_bufs); | |
1780 | err = visorbus_read_channel(dev, channel_offset, | |
1781 | &devdata->num_rcv_bufs, 4); | |
00748b0c TS |
1782 | if (err) { |
1783 | dev_err(&dev->device, | |
1784 | "%s failed to get #rcv bufs from chan (%d)\n", | |
1785 | __func__, err); | |
68905a14 | 1786 | goto cleanup_netdev; |
00748b0c | 1787 | } |
68905a14 | 1788 | |
5e757bc5 SB |
1789 | devdata->rcvbuf = kcalloc(devdata->num_rcv_bufs, |
1790 | sizeof(struct sk_buff *), GFP_KERNEL); | |
68905a14 DK |
1791 | if (!devdata->rcvbuf) { |
1792 | err = -ENOMEM; | |
d12324e3 | 1793 | goto cleanup_netdev; |
68905a14 DK |
1794 | } |
1795 | ||
1796 | /* set the net_xmit outstanding threshold */ | |
1797 | /* always leave two slots open but you should have 3 at a minimum */ | |
36927c18 | 1798 | /* note that max_outstanding_net_xmits must be > 0 */ |
68905a14 | 1799 | devdata->max_outstanding_net_xmits = |
36927c18 | 1800 | max_t(unsigned long, 3, ((devdata->num_rcv_bufs / 3) - 2)); |
68905a14 | 1801 | devdata->upper_threshold_net_xmits = |
36927c18 TS |
1802 | max_t(unsigned long, |
1803 | 2, (devdata->max_outstanding_net_xmits - 1)); | |
68905a14 | 1804 | devdata->lower_threshold_net_xmits = |
36927c18 TS |
1805 | max_t(unsigned long, |
1806 | 1, (devdata->max_outstanding_net_xmits / 2)); | |
68905a14 DK |
1807 | |
1808 | skb_queue_head_init(&devdata->xmitbufhead); | |
1809 | ||
1810 | /* create a cmdrsp we can use to post and unpost rcv buffers */ | |
1811 | devdata->cmdrsp_rcv = kmalloc(SIZEOF_CMDRSP, GFP_ATOMIC); | |
1812 | if (!devdata->cmdrsp_rcv) { | |
1813 | err = -ENOMEM; | |
d12324e3 | 1814 | goto cleanup_rcvbuf; |
68905a14 DK |
1815 | } |
1816 | devdata->xmit_cmdrsp = kmalloc(SIZEOF_CMDRSP, GFP_ATOMIC); | |
1817 | if (!devdata->xmit_cmdrsp) { | |
1818 | err = -ENOMEM; | |
d12324e3 | 1819 | goto cleanup_cmdrsp_rcv; |
68905a14 | 1820 | } |
68905a14 DK |
1821 | INIT_WORK(&devdata->timeout_reset, visornic_timeout_reset); |
1822 | devdata->server_down = false; | |
1823 | devdata->server_change_state = false; | |
1824 | ||
1825 | /*set the default mtu */ | |
1826 | channel_offset = offsetof(struct spar_io_channel_protocol, | |
1827 | vnic.mtu); | |
1828 | err = visorbus_read_channel(dev, channel_offset, &netdev->mtu, 4); | |
00748b0c TS |
1829 | if (err) { |
1830 | dev_err(&dev->device, | |
1831 | "%s failed to get mtu from chan (%d)\n", | |
1832 | __func__, err); | |
68905a14 | 1833 | goto cleanup_xmit_cmdrsp; |
00748b0c | 1834 | } |
68905a14 DK |
1835 | |
1836 | /* TODO: Setup Interrupt information */ | |
1837 | /* Let's start our threads to get responses */ | |
946b2546 NH |
1838 | netif_napi_add(netdev, &devdata->napi, visornic_poll, 64); |
1839 | ||
1840 | setup_timer(&devdata->irq_poll_timer, poll_for_irq, | |
1841 | (unsigned long)devdata); | |
77c9a4ae | 1842 | /* Note: This time has to start running before the while |
946b2546 NH |
1843 | * loop below because the napi routine is responsible for |
1844 | * setting enab_dis_acked | |
1845 | */ | |
1846 | mod_timer(&devdata->irq_poll_timer, msecs_to_jiffies(2)); | |
1847 | ||
68905a14 DK |
1848 | channel_offset = offsetof(struct spar_io_channel_protocol, |
1849 | channel_header.features); | |
1850 | err = visorbus_read_channel(dev, channel_offset, &features, 8); | |
00748b0c TS |
1851 | if (err) { |
1852 | dev_err(&dev->device, | |
1853 | "%s failed to get features from chan (%d)\n", | |
1854 | __func__, err); | |
946b2546 | 1855 | goto cleanup_napi_add; |
00748b0c | 1856 | } |
68905a14 DK |
1857 | |
1858 | features |= ULTRA_IO_CHANNEL_IS_POLLING; | |
91678f37 | 1859 | features |= ULTRA_IO_DRIVER_SUPPORTS_ENHANCED_RCVBUF_CHECKING; |
68905a14 | 1860 | err = visorbus_write_channel(dev, channel_offset, &features, 8); |
00748b0c TS |
1861 | if (err) { |
1862 | dev_err(&dev->device, | |
1863 | "%s failed to set features in chan (%d)\n", | |
1864 | __func__, err); | |
946b2546 | 1865 | goto cleanup_napi_add; |
00748b0c | 1866 | } |
68905a14 | 1867 | |
61dd330a DK |
1868 | /* Let's start our threads to get responses */ |
1869 | netif_napi_add(netdev, &devdata->napi, visornic_poll, NAPI_WEIGHT); | |
1870 | ||
77c9a4ae | 1871 | /* Note: Interupts have to be enable before the while |
61dd330a DK |
1872 | * loop below because the napi routine is responsible for |
1873 | * setting enab_dis_acked | |
1874 | */ | |
1875 | visorbus_enable_channel_interrupts(dev); | |
1876 | ||
68905a14 | 1877 | err = register_netdev(netdev); |
00748b0c TS |
1878 | if (err) { |
1879 | dev_err(&dev->device, | |
1880 | "%s register_netdev failed (%d)\n", __func__, err); | |
946b2546 | 1881 | goto cleanup_napi_add; |
00748b0c | 1882 | } |
68905a14 DK |
1883 | |
1884 | /* create debgug/sysfs directories */ | |
1885 | devdata->eth_debugfs_dir = debugfs_create_dir(netdev->name, | |
1886 | visornic_debugfs_dir); | |
1887 | if (!devdata->eth_debugfs_dir) { | |
00748b0c TS |
1888 | dev_err(&dev->device, |
1889 | "%s debugfs_create_dir %s failed\n", | |
1890 | __func__, netdev->name); | |
68905a14 | 1891 | err = -ENOMEM; |
5b12100a | 1892 | goto cleanup_register_netdev; |
68905a14 DK |
1893 | } |
1894 | ||
00748b0c TS |
1895 | dev_info(&dev->device, "%s success netdev=%s\n", |
1896 | __func__, netdev->name); | |
68905a14 DK |
1897 | return 0; |
1898 | ||
5b12100a DK |
1899 | cleanup_register_netdev: |
1900 | unregister_netdev(netdev); | |
1901 | ||
946b2546 NH |
1902 | cleanup_napi_add: |
1903 | del_timer_sync(&devdata->irq_poll_timer); | |
1904 | netif_napi_del(&devdata->napi); | |
1905 | ||
68905a14 DK |
1906 | cleanup_xmit_cmdrsp: |
1907 | kfree(devdata->xmit_cmdrsp); | |
1908 | ||
1909 | cleanup_cmdrsp_rcv: | |
1910 | kfree(devdata->cmdrsp_rcv); | |
1911 | ||
1912 | cleanup_rcvbuf: | |
1913 | kfree(devdata->rcvbuf); | |
1914 | ||
1915 | cleanup_netdev: | |
1916 | free_netdev(netdev); | |
1917 | return err; | |
1918 | } | |
1919 | ||
1920 | /** | |
1921 | * host_side_disappeared - IO part is gone. | |
1922 | * @devdata: device object | |
1923 | * | |
1924 | * IO partition servicing this device is gone, do cleanup | |
1925 | * Returns void. | |
1926 | */ | |
1927 | static void host_side_disappeared(struct visornic_devdata *devdata) | |
1928 | { | |
1929 | unsigned long flags; | |
1930 | ||
1931 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
68905a14 DK |
1932 | devdata->dev = NULL; /* indicate device destroyed */ |
1933 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1934 | } | |
1935 | ||
1936 | /** | |
1937 | * visornic_remove - Called when visornic dev goes away | |
1938 | * @dev: visornic device that is being removed | |
1939 | * | |
1940 | * Called when DEVICE_DESTROY gets called to remove device. | |
1941 | * Returns void | |
1942 | */ | |
1943 | static void visornic_remove(struct visor_device *dev) | |
1944 | { | |
1945 | struct visornic_devdata *devdata = dev_get_drvdata(&dev->device); | |
46df8226 TS |
1946 | struct net_device *netdev; |
1947 | unsigned long flags; | |
68905a14 | 1948 | |
00748b0c TS |
1949 | if (!devdata) { |
1950 | dev_err(&dev->device, "%s no devdata\n", __func__); | |
68905a14 | 1951 | return; |
00748b0c | 1952 | } |
46df8226 TS |
1953 | spin_lock_irqsave(&devdata->priv_lock, flags); |
1954 | if (devdata->going_away) { | |
1955 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1956 | dev_err(&dev->device, "%s already being removed\n", __func__); | |
1957 | return; | |
1958 | } | |
1959 | devdata->going_away = true; | |
1960 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1961 | netdev = devdata->netdev; | |
1962 | if (!netdev) { | |
1963 | dev_err(&dev->device, "%s not net device\n", __func__); | |
1964 | return; | |
1965 | } | |
1966 | ||
1967 | /* going_away prevents new items being added to the workqueues */ | |
ce388d7e | 1968 | cancel_work_sync(&devdata->timeout_reset); |
46df8226 TS |
1969 | |
1970 | debugfs_remove_recursive(devdata->eth_debugfs_dir); | |
1971 | ||
1972 | unregister_netdev(netdev); /* this will call visornic_close() */ | |
1973 | ||
946b2546 NH |
1974 | del_timer_sync(&devdata->irq_poll_timer); |
1975 | netif_napi_del(&devdata->napi); | |
46df8226 | 1976 | |
68905a14 DK |
1977 | dev_set_drvdata(&dev->device, NULL); |
1978 | host_side_disappeared(devdata); | |
8d0119d8 | 1979 | devdata_release(devdata); |
46df8226 | 1980 | free_netdev(netdev); |
68905a14 DK |
1981 | } |
1982 | ||
1983 | /** | |
1984 | * visornic_pause - Called when IO Part disappears | |
1985 | * @dev: visornic device that is being serviced | |
1986 | * @complete_func: call when finished. | |
1987 | * | |
1988 | * Called when the IO Partition has gone down. Need to free | |
1989 | * up resources and wait for IO partition to come back. Mark | |
1990 | * link as down and don't attempt any DMA. When we have freed | |
1991 | * memory call the complete_func so that Command knows we are | |
1992 | * done. If we don't call complete_func, IO part will never | |
1993 | * come back. | |
1994 | * Returns 0 for success. | |
1995 | */ | |
1996 | static int visornic_pause(struct visor_device *dev, | |
1997 | visorbus_state_complete_func complete_func) | |
1998 | { | |
1999 | struct visornic_devdata *devdata = dev_get_drvdata(&dev->device); | |
2000 | ||
d01da5ea | 2001 | visornic_serverdown(devdata, complete_func); |
68905a14 DK |
2002 | return 0; |
2003 | } | |
2004 | ||
2005 | /** | |
2006 | * visornic_resume - Called when IO part has recovered | |
2007 | * @dev: visornic device that is being serviced | |
2008 | * @compelte_func: call when finished | |
2009 | * | |
2010 | * Called when the IO partition has recovered. Reestablish | |
2011 | * connection to the IO part and set the link up. Okay to do | |
2012 | * DMA again. | |
2013 | * Returns 0 for success. | |
2014 | */ | |
2015 | static int visornic_resume(struct visor_device *dev, | |
2016 | visorbus_state_complete_func complete_func) | |
2017 | { | |
2018 | struct visornic_devdata *devdata; | |
2019 | struct net_device *netdev; | |
2020 | unsigned long flags; | |
2021 | ||
2022 | devdata = dev_get_drvdata(&dev->device); | |
00748b0c TS |
2023 | if (!devdata) { |
2024 | dev_err(&dev->device, "%s no devdata\n", __func__); | |
68905a14 | 2025 | return -EINVAL; |
00748b0c | 2026 | } |
68905a14 DK |
2027 | |
2028 | netdev = devdata->netdev; | |
2029 | ||
c847020e TS |
2030 | spin_lock_irqsave(&devdata->priv_lock, flags); |
2031 | if (devdata->server_change_state) { | |
68905a14 | 2032 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
c847020e | 2033 | dev_err(&dev->device, "%s server already changing state\n", |
00748b0c | 2034 | __func__); |
c847020e | 2035 | return -EINVAL; |
68905a14 | 2036 | } |
c847020e TS |
2037 | if (!devdata->server_down) { |
2038 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
2039 | dev_err(&dev->device, "%s server not down\n", __func__); | |
2040 | complete_func(dev, 0); | |
2041 | return 0; | |
2042 | } | |
2043 | devdata->server_change_state = true; | |
2044 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
946b2546 | 2045 | |
c847020e TS |
2046 | /* Must transition channel to ATTACHED state BEFORE |
2047 | * we can start using the device again. | |
2048 | * TODO: State transitions | |
2049 | */ | |
946b2546 NH |
2050 | mod_timer(&devdata->irq_poll_timer, msecs_to_jiffies(2)); |
2051 | ||
2052 | init_rcv_bufs(netdev, devdata); | |
c847020e TS |
2053 | |
2054 | rtnl_lock(); | |
2055 | dev_open(netdev); | |
2056 | rtnl_unlock(); | |
68905a14 DK |
2057 | |
2058 | complete_func(dev, 0); | |
2059 | return 0; | |
2060 | } | |
2061 | ||
2062 | /** | |
2063 | * visornic_init - Init function | |
2064 | * | |
2065 | * Init function for the visornic driver. Do initial driver setup | |
2066 | * and wait for devices. | |
2067 | * Returns 0 for success, negative for error. | |
2068 | */ | |
2069 | static int visornic_init(void) | |
2070 | { | |
2071 | struct dentry *ret; | |
2072 | int err = -ENOMEM; | |
2073 | ||
68905a14 DK |
2074 | visornic_debugfs_dir = debugfs_create_dir("visornic", NULL); |
2075 | if (!visornic_debugfs_dir) | |
2076 | return err; | |
2077 | ||
2078 | ret = debugfs_create_file("info", S_IRUSR, visornic_debugfs_dir, NULL, | |
2079 | &debugfs_info_fops); | |
2080 | if (!ret) | |
2081 | goto cleanup_debugfs; | |
2082 | ret = debugfs_create_file("enable_ints", S_IWUSR, visornic_debugfs_dir, | |
2083 | NULL, &debugfs_enable_ints_fops); | |
2084 | if (!ret) | |
2085 | goto cleanup_debugfs; | |
2086 | ||
8b5081c8 | 2087 | err = visorbus_register_visor_driver(&visornic_driver); |
186896fd DB |
2088 | if (err) |
2089 | goto cleanup_debugfs; | |
2090 | ||
2091 | return 0; | |
68905a14 | 2092 | |
68905a14 DK |
2093 | cleanup_debugfs: |
2094 | debugfs_remove_recursive(visornic_debugfs_dir); | |
2095 | ||
2096 | return err; | |
2097 | } | |
2098 | ||
2099 | /** | |
2100 | * visornic_cleanup - driver exit routine | |
2101 | * | |
2102 | * Unregister driver from the bus and free up memory. | |
2103 | */ | |
2104 | static void visornic_cleanup(void) | |
2105 | { | |
3798ff31 TS |
2106 | visorbus_unregister_visor_driver(&visornic_driver); |
2107 | ||
68905a14 | 2108 | debugfs_remove_recursive(visornic_debugfs_dir); |
68905a14 DK |
2109 | } |
2110 | ||
2111 | module_init(visornic_init); | |
2112 | module_exit(visornic_cleanup); | |
2113 | ||
2114 | MODULE_AUTHOR("Unisys"); | |
2115 | MODULE_LICENSE("GPL"); | |
2116 | MODULE_DESCRIPTION("sPAR nic driver for sparlinux: ver 1.0.0.0"); | |
2117 | MODULE_VERSION("1.0.0.0"); |