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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 | /* GUIDS for director channel type supported by this driver. */ |
40 | static struct visor_channeltype_descriptor visornic_channel_types[] = { | |
41 | /* Note that the only channel type we expect to be reported by the | |
42 | * bus driver is the SPAR_VNIC channel. | |
43 | */ | |
44 | { SPAR_VNIC_CHANNEL_PROTOCOL_UUID, "ultravnic" }, | |
45 | { NULL_UUID_LE, NULL } | |
46 | }; | |
110a66be PB |
47 | MODULE_DEVICE_TABLE(visorbus, visornic_channel_types); |
48 | /* | |
49 | * FIXME XXX: This next line of code must be fixed and removed before | |
50 | * acceptance into the 'normal' part of the kernel. It is only here as a place | |
51 | * holder to get module autoloading functionality working for visorbus. Code | |
52 | * must be added to scripts/mode/file2alias.c, etc., to get this working | |
53 | * properly. | |
54 | */ | |
55 | MODULE_ALIAS("visorbus:" SPAR_VNIC_CHANNEL_PROTOCOL_UUID_STR); | |
68905a14 | 56 | |
68905a14 DK |
57 | struct chanstat { |
58 | unsigned long got_rcv; | |
59 | unsigned long got_enbdisack; | |
60 | unsigned long got_xmit_done; | |
61 | unsigned long xmit_fail; | |
62 | unsigned long sent_enbdis; | |
63 | unsigned long sent_promisc; | |
64 | unsigned long sent_post; | |
81d275c6 | 65 | unsigned long sent_post_failed; |
68905a14 DK |
66 | unsigned long sent_xmit; |
67 | unsigned long reject_count; | |
68 | unsigned long extra_rcvbufs_sent; | |
69 | }; | |
70 | ||
71 | struct visornic_devdata { | |
77c9a4ae EA |
72 | /* 0 disabled 1 enabled to receive */ |
73 | unsigned short enabled; | |
74 | /* NET_RCV_ENABLE/DISABLE acked by IOPART */ | |
75 | unsigned short enab_dis_acked; | |
76 | ||
68905a14 | 77 | struct visor_device *dev; |
68905a14 DK |
78 | struct net_device *netdev; |
79 | struct net_device_stats net_stats; | |
80 | atomic_t interrupt_rcvd; | |
81 | wait_queue_head_t rsp_queue; | |
82 | struct sk_buff **rcvbuf; | |
77c9a4ae EA |
83 | /* incarnation_id lets IOPART know about re-birth */ |
84 | u64 incarnation_id; | |
85 | /* flags as they were prior to set_multicast_list */ | |
86 | unsigned short old_flags; | |
87 | atomic_t usage; /* count of users */ | |
88 | ||
89 | /* number of rcv buffers the vnic will post */ | |
90 | int num_rcv_bufs; | |
68905a14 DK |
91 | int num_rcv_bufs_could_not_alloc; |
92 | atomic_t num_rcvbuf_in_iovm; | |
93 | unsigned long alloc_failed_in_if_needed_cnt; | |
94 | unsigned long alloc_failed_in_repost_rtn_cnt; | |
77c9a4ae EA |
95 | |
96 | /* absolute max number of outstanding xmits - should never hit this */ | |
97 | unsigned long max_outstanding_net_xmits; | |
98 | /* high water mark for calling netif_stop_queue() */ | |
99 | unsigned long upper_threshold_net_xmits; | |
100 | /* high water mark for calling netif_wake_queue() */ | |
101 | unsigned long lower_threshold_net_xmits; | |
102 | /* xmitbufhead - head of the xmit buffer list sent to the IOPART end */ | |
103 | struct sk_buff_head xmitbufhead; | |
104 | ||
d01da5ea | 105 | visorbus_state_complete_func server_down_complete_func; |
68905a14 | 106 | struct work_struct timeout_reset; |
77c9a4ae EA |
107 | /* cmdrsp_rcv is used for posting/unposting rcv buffers */ |
108 | struct uiscmdrsp *cmdrsp_rcv; | |
109 | /* xmit_cmdrsp - issues NET_XMIT - only one active xmit at a time */ | |
110 | struct uiscmdrsp *xmit_cmdrsp; | |
111 | ||
68905a14 DK |
112 | bool server_down; /* IOPART is down */ |
113 | bool server_change_state; /* Processing SERVER_CHANGESTATE msg */ | |
46df8226 | 114 | bool going_away; /* device is being torn down */ |
68905a14 | 115 | struct dentry *eth_debugfs_dir; |
68905a14 DK |
116 | u64 interrupts_rcvd; |
117 | u64 interrupts_notme; | |
118 | u64 interrupts_disabled; | |
119 | u64 busy_cnt; | |
120 | spinlock_t priv_lock; /* spinlock to access devdata structures */ | |
121 | ||
122 | /* flow control counter */ | |
123 | u64 flow_control_upper_hits; | |
124 | u64 flow_control_lower_hits; | |
125 | ||
126 | /* debug counters */ | |
127 | unsigned long n_rcv0; /* # rcvs of 0 buffers */ | |
128 | unsigned long n_rcv1; /* # rcvs of 1 buffers */ | |
129 | unsigned long n_rcv2; /* # rcvs of 2 buffers */ | |
130 | unsigned long n_rcvx; /* # rcvs of >2 buffers */ | |
77c9a4ae EA |
131 | unsigned long found_repost_rcvbuf_cnt; /* # repost_rcvbuf_cnt */ |
132 | unsigned long repost_found_skb_cnt; /* # of found the skb */ | |
133 | unsigned long n_repost_deficit; /* # of lost rcv buffers */ | |
134 | unsigned long bad_rcv_buf; /* # of unknown rcv skb not freed */ | |
68905a14 DK |
135 | unsigned long n_rcv_packets_not_accepted;/* # bogs rcv packets */ |
136 | ||
137 | int queuefullmsg_logged; | |
138 | struct chanstat chstat; | |
946b2546 NH |
139 | struct timer_list irq_poll_timer; |
140 | struct napi_struct napi; | |
141 | struct uiscmdrsp cmdrsp[SIZEOF_CMDRSP]; | |
68905a14 DK |
142 | }; |
143 | ||
68905a14 DK |
144 | /** |
145 | * visor_copy_fragsinfo_from_skb( | |
146 | * @skb_in: skbuff that we are pulling the frags from | |
147 | * @firstfraglen: length of first fragment in skb | |
148 | * @frags_max: max len of frags array | |
149 | * @frags: frags array filled in on output | |
150 | * | |
151 | * Copy the fragment list in the SKB to a phys_info | |
152 | * array that the IOPART understands. | |
153 | * Return value indicates number of entries filled in frags | |
154 | * Negative values indicate an error. | |
155 | */ | |
6a957193 | 156 | static int |
68905a14 DK |
157 | visor_copy_fragsinfo_from_skb(struct sk_buff *skb, unsigned int firstfraglen, |
158 | unsigned int frags_max, | |
159 | struct phys_info frags[]) | |
160 | { | |
03759f8c | 161 | unsigned int count = 0, frag, size, offset = 0, numfrags; |
513e1cbd | 162 | unsigned int total_count; |
68905a14 DK |
163 | |
164 | numfrags = skb_shinfo(skb)->nr_frags; | |
165 | ||
77c9a4ae | 166 | /* Compute the number of fragments this skb has, and if its more than |
513e1cbd NH |
167 | * frag array can hold, linearize the skb |
168 | */ | |
169 | total_count = numfrags + (firstfraglen / PI_PAGE_SIZE); | |
170 | if (firstfraglen % PI_PAGE_SIZE) | |
171 | total_count++; | |
172 | ||
173 | if (total_count > frags_max) { | |
174 | if (skb_linearize(skb)) | |
175 | return -EINVAL; | |
176 | numfrags = skb_shinfo(skb)->nr_frags; | |
177 | firstfraglen = 0; | |
178 | } | |
179 | ||
68905a14 DK |
180 | while (firstfraglen) { |
181 | if (count == frags_max) | |
182 | return -EINVAL; | |
183 | ||
184 | frags[count].pi_pfn = | |
185 | page_to_pfn(virt_to_page(skb->data + offset)); | |
186 | frags[count].pi_off = | |
187 | (unsigned long)(skb->data + offset) & PI_PAGE_MASK; | |
188 | size = min_t(unsigned int, firstfraglen, | |
189 | PI_PAGE_SIZE - frags[count].pi_off); | |
190 | ||
191 | /* can take smallest of firstfraglen (what's left) OR | |
192 | * bytes left in the page | |
193 | */ | |
194 | frags[count].pi_len = size; | |
195 | firstfraglen -= size; | |
196 | offset += size; | |
197 | count++; | |
198 | } | |
199 | if (numfrags) { | |
200 | if ((count + numfrags) > frags_max) | |
201 | return -EINVAL; | |
202 | ||
03759f8c | 203 | for (frag = 0; frag < numfrags; frag++) { |
68905a14 | 204 | count = add_physinfo_entries(page_to_pfn( |
03759f8c EA |
205 | skb_frag_page(&skb_shinfo(skb)->frags[frag])), |
206 | skb_shinfo(skb)->frags[frag]. | |
68905a14 | 207 | page_offset, |
03759f8c | 208 | skb_shinfo(skb)->frags[frag]. |
68905a14 | 209 | size, count, frags_max, frags); |
77c9a4ae | 210 | /* add_physinfo_entries only returns |
998ff7f8 NH |
211 | * zero if the frags array is out of room |
212 | * That should never happen because we | |
213 | * fail above, if count+numfrags > frags_max. | |
998ff7f8 | 214 | */ |
6a957193 TS |
215 | if (!count) |
216 | return -EINVAL; | |
68905a14 DK |
217 | } |
218 | } | |
219 | if (skb_shinfo(skb)->frag_list) { | |
220 | struct sk_buff *skbinlist; | |
221 | int c; | |
222 | ||
223 | for (skbinlist = skb_shinfo(skb)->frag_list; skbinlist; | |
224 | skbinlist = skbinlist->next) { | |
225 | c = visor_copy_fragsinfo_from_skb(skbinlist, | |
226 | skbinlist->len - | |
227 | skbinlist->data_len, | |
228 | frags_max - count, | |
229 | &frags[count]); | |
230 | if (c < 0) | |
231 | return c; | |
232 | count += c; | |
233 | } | |
234 | } | |
235 | return count; | |
236 | } | |
237 | ||
68905a14 DK |
238 | static ssize_t enable_ints_write(struct file *file, |
239 | const char __user *buffer, | |
240 | size_t count, loff_t *ppos) | |
241 | { | |
77c9a4ae | 242 | /* Don't want to break ABI here by having a debugfs |
52b1660d NH |
243 | * file that no longer exists or is writable, so |
244 | * lets just make this a vestigual function | |
245 | */ | |
68905a14 DK |
246 | return count; |
247 | } | |
248 | ||
0543205b DK |
249 | static const struct file_operations debugfs_enable_ints_fops = { |
250 | .write = enable_ints_write, | |
251 | }; | |
252 | ||
68905a14 | 253 | /** |
77c9a4ae | 254 | * visornic_serverdown_complete - IOPART went down, pause device |
68905a14 DK |
255 | * @work: Work queue it was scheduled on |
256 | * | |
257 | * The IO partition has gone down and we need to do some cleanup | |
258 | * for when it comes back. Treat the IO partition as the link | |
259 | * being down. | |
260 | * Returns void. | |
261 | */ | |
262 | static void | |
ace72eef | 263 | visornic_serverdown_complete(struct visornic_devdata *devdata) |
68905a14 | 264 | { |
68905a14 | 265 | struct net_device *netdev; |
68905a14 | 266 | |
68905a14 DK |
267 | netdev = devdata->netdev; |
268 | ||
946b2546 NH |
269 | /* Stop polling for interrupts */ |
270 | del_timer_sync(&devdata->irq_poll_timer); | |
68905a14 | 271 | |
0d507393 NH |
272 | rtnl_lock(); |
273 | dev_close(netdev); | |
274 | rtnl_unlock(); | |
68905a14 | 275 | |
68905a14 | 276 | atomic_set(&devdata->num_rcvbuf_in_iovm, 0); |
db849927 TS |
277 | devdata->chstat.sent_xmit = 0; |
278 | devdata->chstat.got_xmit_done = 0; | |
68905a14 | 279 | |
d01da5ea TS |
280 | if (devdata->server_down_complete_func) |
281 | (*devdata->server_down_complete_func)(devdata->dev, 0); | |
282 | ||
68905a14 DK |
283 | devdata->server_down = true; |
284 | devdata->server_change_state = false; | |
d01da5ea | 285 | devdata->server_down_complete_func = NULL; |
68905a14 DK |
286 | } |
287 | ||
288 | /** | |
77c9a4ae | 289 | * visornic_serverdown - Command has notified us that IOPART is down |
68905a14 DK |
290 | * @devdata: device that is being managed by IOPART |
291 | * | |
292 | * Schedule the work needed to handle the server down request. Make | |
293 | * sure we haven't already handled the server change state event. | |
294 | * Returns 0 if we scheduled the work, -EINVAL on error. | |
295 | */ | |
296 | static int | |
d01da5ea TS |
297 | visornic_serverdown(struct visornic_devdata *devdata, |
298 | visorbus_state_complete_func complete_func) | |
68905a14 | 299 | { |
46df8226 | 300 | unsigned long flags; |
4145ba76 | 301 | int err; |
46df8226 TS |
302 | |
303 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
4145ba76 | 304 | if (devdata->server_change_state) { |
00748b0c TS |
305 | dev_dbg(&devdata->dev->device, "%s changing state\n", |
306 | __func__); | |
4145ba76 TS |
307 | err = -EINVAL; |
308 | goto err_unlock; | |
309 | } | |
310 | if (devdata->server_down) { | |
311 | dev_dbg(&devdata->dev->device, "%s already down\n", | |
312 | __func__); | |
313 | err = -EINVAL; | |
314 | goto err_unlock; | |
315 | } | |
316 | if (devdata->going_away) { | |
317 | dev_dbg(&devdata->dev->device, | |
318 | "%s aborting because device removal pending\n", | |
319 | __func__); | |
320 | err = -ENODEV; | |
321 | goto err_unlock; | |
05f1b17e | 322 | } |
4145ba76 TS |
323 | devdata->server_change_state = true; |
324 | devdata->server_down_complete_func = complete_func; | |
05f1b17e | 325 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
4145ba76 TS |
326 | |
327 | visornic_serverdown_complete(devdata); | |
68905a14 | 328 | return 0; |
4145ba76 TS |
329 | |
330 | err_unlock: | |
331 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
332 | return err; | |
68905a14 DK |
333 | } |
334 | ||
335 | /** | |
336 | * alloc_rcv_buf - alloc rcv buffer to be given to the IO Partition. | |
337 | * @netdev: network adapter the rcv bufs are attached too. | |
338 | * | |
339 | * Create an sk_buff (rcv_buf) that will be passed to the IO Partition | |
340 | * so that it can write rcv data into our memory space. | |
341 | * Return pointer to sk_buff | |
342 | */ | |
343 | static struct sk_buff * | |
344 | alloc_rcv_buf(struct net_device *netdev) | |
345 | { | |
346 | struct sk_buff *skb; | |
347 | ||
348 | /* NOTE: the first fragment in each rcv buffer is pointed to by | |
349 | * rcvskb->data. For now all rcv buffers will be RCVPOST_BUF_SIZE | |
77c9a4ae | 350 | * in length, so the first frag is large enough to hold 1514. |
68905a14 DK |
351 | */ |
352 | skb = alloc_skb(RCVPOST_BUF_SIZE, GFP_ATOMIC); | |
353 | if (!skb) | |
354 | return NULL; | |
355 | skb->dev = netdev; | |
68905a14 DK |
356 | /* current value of mtu doesn't come into play here; large |
357 | * packets will just end up using multiple rcv buffers all of | |
77c9a4ae | 358 | * same size. |
68905a14 | 359 | */ |
77c9a4ae EA |
360 | skb->len = RCVPOST_BUF_SIZE; |
361 | /* alloc_skb already zeroes it out for clarification. */ | |
362 | skb->data_len = 0; | |
68905a14 DK |
363 | return skb; |
364 | } | |
365 | ||
366 | /** | |
367 | * post_skb - post a skb to the IO Partition. | |
368 | * @cmdrsp: cmdrsp packet to be send to the IO Partition | |
369 | * @devdata: visornic_devdata to post the skb too | |
370 | * @skb: skb to give to the IO partition | |
371 | * | |
372 | * Send the skb to the IO Partition. | |
373 | * Returns void | |
374 | */ | |
375 | static inline void | |
376 | post_skb(struct uiscmdrsp *cmdrsp, | |
377 | struct visornic_devdata *devdata, struct sk_buff *skb) | |
378 | { | |
379 | cmdrsp->net.buf = skb; | |
380 | cmdrsp->net.rcvpost.frag.pi_pfn = page_to_pfn(virt_to_page(skb->data)); | |
381 | cmdrsp->net.rcvpost.frag.pi_off = | |
382 | (unsigned long)skb->data & PI_PAGE_MASK; | |
383 | cmdrsp->net.rcvpost.frag.pi_len = skb->len; | |
91678f37 | 384 | cmdrsp->net.rcvpost.unique_num = devdata->incarnation_id; |
68905a14 DK |
385 | |
386 | if ((cmdrsp->net.rcvpost.frag.pi_off + skb->len) <= PI_PAGE_SIZE) { | |
387 | cmdrsp->net.type = NET_RCV_POST; | |
388 | cmdrsp->cmdtype = CMD_NET_TYPE; | |
264f7b8a DB |
389 | if (!visorchannel_signalinsert(devdata->dev->visorchannel, |
390 | IOCHAN_TO_IOPART, | |
391 | cmdrsp)) { | |
81d275c6 TS |
392 | atomic_inc(&devdata->num_rcvbuf_in_iovm); |
393 | devdata->chstat.sent_post++; | |
394 | } else { | |
395 | devdata->chstat.sent_post_failed++; | |
396 | } | |
68905a14 DK |
397 | } |
398 | } | |
399 | ||
400 | /** | |
401 | * send_enbdis - send NET_RCV_ENBDIS to IO Partition | |
402 | * @netdev: netdevice we are enable/disable, used as context | |
403 | * return value | |
404 | * @state: enable = 1/disable = 0 | |
405 | * @devdata: visornic device we are enabling/disabling | |
406 | * | |
407 | * Send the enable/disable message to the IO Partition. | |
408 | * Returns void | |
409 | */ | |
410 | static void | |
411 | send_enbdis(struct net_device *netdev, int state, | |
412 | struct visornic_devdata *devdata) | |
413 | { | |
414 | devdata->cmdrsp_rcv->net.enbdis.enable = state; | |
415 | devdata->cmdrsp_rcv->net.enbdis.context = netdev; | |
416 | devdata->cmdrsp_rcv->net.type = NET_RCV_ENBDIS; | |
417 | devdata->cmdrsp_rcv->cmdtype = CMD_NET_TYPE; | |
264f7b8a DB |
418 | if (!visorchannel_signalinsert(devdata->dev->visorchannel, |
419 | IOCHAN_TO_IOPART, | |
420 | devdata->cmdrsp_rcv)) | |
81d275c6 | 421 | devdata->chstat.sent_enbdis++; |
68905a14 DK |
422 | } |
423 | ||
424 | /** | |
425 | * visornic_disable_with_timeout - Disable network adapter | |
426 | * @netdev: netdevice to disale | |
427 | * @timeout: timeout to wait for disable | |
428 | * | |
429 | * Disable the network adapter and inform the IO Partition that we | |
430 | * are disabled, reclaim memory from rcv bufs. | |
431 | * Returns 0 on success, negative for failure of IO Partition | |
432 | * responding. | |
433 | * | |
434 | */ | |
435 | static int | |
436 | visornic_disable_with_timeout(struct net_device *netdev, const int timeout) | |
437 | { | |
438 | struct visornic_devdata *devdata = netdev_priv(netdev); | |
439 | int i; | |
440 | unsigned long flags; | |
441 | int wait = 0; | |
442 | ||
68905a14 DK |
443 | /* send a msg telling the other end we are stopping incoming pkts */ |
444 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
445 | devdata->enabled = 0; | |
446 | devdata->enab_dis_acked = 0; /* must wait for ack */ | |
447 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
448 | ||
449 | /* send disable and wait for ack -- don't hold lock when sending | |
450 | * disable because if the queue is full, insert might sleep. | |
451 | */ | |
452 | send_enbdis(netdev, 0, devdata); | |
453 | ||
454 | /* wait for ack to arrive before we try to free rcv buffers | |
455 | * NOTE: the other end automatically unposts the rcv buffers when | |
456 | * when it gets a disable. | |
457 | */ | |
458 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
0c677e9c | 459 | while ((timeout == VISORNIC_INFINITE_RSP_WAIT) || |
68905a14 DK |
460 | (wait < timeout)) { |
461 | if (devdata->enab_dis_acked) | |
462 | break; | |
463 | if (devdata->server_down || devdata->server_change_state) { | |
464 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
00748b0c TS |
465 | dev_dbg(&netdev->dev, "%s server went away\n", |
466 | __func__); | |
68905a14 DK |
467 | return -EIO; |
468 | } | |
469 | set_current_state(TASK_INTERRUPTIBLE); | |
470 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
471 | wait += schedule_timeout(msecs_to_jiffies(10)); | |
472 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
473 | } | |
474 | ||
475 | /* Wait for usage to go to 1 (no other users) before freeing | |
476 | * rcv buffers | |
477 | */ | |
478 | if (atomic_read(&devdata->usage) > 1) { | |
479 | while (1) { | |
480 | set_current_state(TASK_INTERRUPTIBLE); | |
481 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
482 | schedule_timeout(msecs_to_jiffies(10)); | |
483 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
484 | if (atomic_read(&devdata->usage)) | |
485 | break; | |
486 | } | |
487 | } | |
68905a14 DK |
488 | /* we've set enabled to 0, so we can give up the lock. */ |
489 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
490 | ||
946b2546 NH |
491 | /* stop the transmit queue so nothing more can be transmitted */ |
492 | netif_stop_queue(netdev); | |
493 | ||
494 | napi_disable(&devdata->napi); | |
495 | ||
0d507393 NH |
496 | skb_queue_purge(&devdata->xmitbufhead); |
497 | ||
68905a14 DK |
498 | /* Free rcv buffers - other end has automatically unposed them on |
499 | * disable | |
500 | */ | |
501 | for (i = 0; i < devdata->num_rcv_bufs; i++) { | |
502 | if (devdata->rcvbuf[i]) { | |
503 | kfree_skb(devdata->rcvbuf[i]); | |
504 | devdata->rcvbuf[i] = NULL; | |
505 | } | |
506 | } | |
507 | ||
68905a14 DK |
508 | return 0; |
509 | } | |
510 | ||
511 | /** | |
512 | * init_rcv_bufs -- initialize receive bufs and send them to the IO Part | |
513 | * @netdev: struct netdevice | |
514 | * @devdata: visornic_devdata | |
515 | * | |
516 | * Allocate rcv buffers and post them to the IO Partition. | |
517 | * Return 0 for success, and negative for failure. | |
518 | */ | |
519 | static int | |
520 | init_rcv_bufs(struct net_device *netdev, struct visornic_devdata *devdata) | |
521 | { | |
522 | int i, count; | |
523 | ||
524 | /* allocate fixed number of receive buffers to post to uisnic | |
525 | * post receive buffers after we've allocated a required amount | |
526 | */ | |
527 | for (i = 0; i < devdata->num_rcv_bufs; i++) { | |
528 | devdata->rcvbuf[i] = alloc_rcv_buf(netdev); | |
529 | if (!devdata->rcvbuf[i]) | |
530 | break; /* if we failed to allocate one let us stop */ | |
531 | } | |
532 | if (i == 0) /* couldn't even allocate one -- bail out */ | |
533 | return -ENOMEM; | |
534 | count = i; | |
535 | ||
536 | /* Ensure we can alloc 2/3rd of the requeested number of buffers. | |
537 | * 2/3 is an arbitrary choice; used also in ndis init.c | |
538 | */ | |
539 | if (count < ((2 * devdata->num_rcv_bufs) / 3)) { | |
540 | /* free receive buffers we did alloc and then bail out */ | |
541 | for (i = 0; i < count; i++) { | |
542 | kfree_skb(devdata->rcvbuf[i]); | |
543 | devdata->rcvbuf[i] = NULL; | |
544 | } | |
545 | return -ENOMEM; | |
546 | } | |
547 | ||
548 | /* post receive buffers to receive incoming input - without holding | |
549 | * lock - we've not enabled nor started the queue so there shouldn't | |
550 | * be any rcv or xmit activity | |
551 | */ | |
552 | for (i = 0; i < count; i++) | |
553 | post_skb(devdata->cmdrsp_rcv, devdata, devdata->rcvbuf[i]); | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | /** | |
559 | * visornic_enable_with_timeout - send enable to IO Part | |
560 | * @netdev: struct net_device | |
561 | * @timeout: Time to wait for the ACK from the enable | |
562 | * | |
563 | * Sends enable to IOVM, inits, and posts receive buffers to IOVM | |
564 | * timeout is defined in msecs (timeout of 0 specifies infinite wait) | |
565 | * Return 0 for success, negavite for failure. | |
566 | */ | |
567 | static int | |
568 | visornic_enable_with_timeout(struct net_device *netdev, const int timeout) | |
569 | { | |
570 | int i; | |
571 | struct visornic_devdata *devdata = netdev_priv(netdev); | |
572 | unsigned long flags; | |
573 | int wait = 0; | |
574 | ||
575 | /* NOTE: the other end automatically unposts the rcv buffers when it | |
576 | * gets a disable. | |
577 | */ | |
578 | i = init_rcv_bufs(netdev, devdata); | |
00748b0c TS |
579 | if (i < 0) { |
580 | dev_err(&netdev->dev, | |
581 | "%s failed to init rcv bufs (%d)\n", __func__, i); | |
68905a14 | 582 | return i; |
00748b0c | 583 | } |
68905a14 DK |
584 | |
585 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
586 | devdata->enabled = 1; | |
6483783d | 587 | devdata->enab_dis_acked = 0; |
68905a14 DK |
588 | |
589 | /* now we're ready, let's send an ENB to uisnic but until we get | |
590 | * an ACK back from uisnic, we'll drop the packets | |
591 | */ | |
592 | devdata->n_rcv_packets_not_accepted = 0; | |
593 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
594 | ||
595 | /* send enable and wait for ack -- don't hold lock when sending enable | |
596 | * because if the queue is full, insert might sleep. | |
597 | */ | |
946b2546 | 598 | napi_enable(&devdata->napi); |
68905a14 DK |
599 | send_enbdis(netdev, 1, devdata); |
600 | ||
601 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
0c677e9c | 602 | while ((timeout == VISORNIC_INFINITE_RSP_WAIT) || |
68905a14 DK |
603 | (wait < timeout)) { |
604 | if (devdata->enab_dis_acked) | |
605 | break; | |
606 | if (devdata->server_down || devdata->server_change_state) { | |
607 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
00748b0c TS |
608 | dev_dbg(&netdev->dev, "%s server went away\n", |
609 | __func__); | |
68905a14 DK |
610 | return -EIO; |
611 | } | |
612 | set_current_state(TASK_INTERRUPTIBLE); | |
613 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
614 | wait += schedule_timeout(msecs_to_jiffies(10)); | |
615 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
616 | } | |
617 | ||
618 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
619 | ||
00748b0c TS |
620 | if (!devdata->enab_dis_acked) { |
621 | dev_err(&netdev->dev, "%s missing ACK\n", __func__); | |
68905a14 | 622 | return -EIO; |
00748b0c | 623 | } |
68905a14 | 624 | |
35a8dd31 | 625 | netif_start_queue(netdev); |
946b2546 | 626 | |
68905a14 DK |
627 | return 0; |
628 | } | |
629 | ||
630 | /** | |
631 | * visornic_timeout_reset - handle xmit timeout resets | |
632 | * @work work item that scheduled the work | |
633 | * | |
634 | * Transmit Timeouts are typically handled by resetting the | |
635 | * device for our virtual NIC we will send a Disable and Enable | |
636 | * to the IOVM. If it doesn't respond we will trigger a serverdown. | |
637 | */ | |
638 | static void | |
639 | visornic_timeout_reset(struct work_struct *work) | |
640 | { | |
641 | struct visornic_devdata *devdata; | |
642 | struct net_device *netdev; | |
643 | int response = 0; | |
644 | ||
645 | devdata = container_of(work, struct visornic_devdata, timeout_reset); | |
646 | netdev = devdata->netdev; | |
647 | ||
4d79002e TS |
648 | rtnl_lock(); |
649 | if (!netif_running(netdev)) { | |
650 | rtnl_unlock(); | |
651 | return; | |
652 | } | |
653 | ||
0c677e9c NH |
654 | response = visornic_disable_with_timeout(netdev, |
655 | VISORNIC_INFINITE_RSP_WAIT); | |
68905a14 DK |
656 | if (response) |
657 | goto call_serverdown; | |
658 | ||
0c677e9c NH |
659 | response = visornic_enable_with_timeout(netdev, |
660 | VISORNIC_INFINITE_RSP_WAIT); | |
68905a14 DK |
661 | if (response) |
662 | goto call_serverdown; | |
68905a14 | 663 | |
4d79002e TS |
664 | rtnl_unlock(); |
665 | ||
68905a14 DK |
666 | return; |
667 | ||
668 | call_serverdown: | |
d01da5ea | 669 | visornic_serverdown(devdata, NULL); |
4d79002e | 670 | rtnl_unlock(); |
68905a14 DK |
671 | } |
672 | ||
673 | /** | |
674 | * visornic_open - Enable the visornic device and mark the queue started | |
675 | * @netdev: netdevice to start | |
676 | * | |
677 | * Enable the device and start the transmit queue. | |
678 | * Return 0 for success | |
679 | */ | |
680 | static int | |
681 | visornic_open(struct net_device *netdev) | |
682 | { | |
0c677e9c | 683 | visornic_enable_with_timeout(netdev, VISORNIC_INFINITE_RSP_WAIT); |
68905a14 | 684 | |
68905a14 DK |
685 | return 0; |
686 | } | |
687 | ||
688 | /** | |
689 | * visornic_close - Disables the visornic device and stops the queues | |
690 | * @netdev: netdevice to start | |
691 | * | |
692 | * Disable the device and stop the transmit queue. | |
693 | * Return 0 for success | |
694 | */ | |
695 | static int | |
696 | visornic_close(struct net_device *netdev) | |
697 | { | |
0c677e9c | 698 | visornic_disable_with_timeout(netdev, VISORNIC_INFINITE_RSP_WAIT); |
68905a14 DK |
699 | |
700 | return 0; | |
701 | } | |
702 | ||
36927c18 TS |
703 | /** |
704 | * devdata_xmits_outstanding - compute outstanding xmits | |
705 | * @devdata: visornic_devdata for device | |
706 | * | |
707 | * Return value is the number of outstanding xmits. | |
708 | */ | |
709 | static unsigned long devdata_xmits_outstanding(struct visornic_devdata *devdata) | |
710 | { | |
711 | if (devdata->chstat.sent_xmit >= devdata->chstat.got_xmit_done) | |
712 | return devdata->chstat.sent_xmit - | |
713 | devdata->chstat.got_xmit_done; | |
6e1edc0f BS |
714 | return (ULONG_MAX - devdata->chstat.got_xmit_done |
715 | + devdata->chstat.sent_xmit + 1); | |
36927c18 TS |
716 | } |
717 | ||
718 | /** | |
719 | * vnic_hit_high_watermark | |
720 | * @devdata: indicates visornic device we are checking | |
721 | * @high_watermark: max num of unacked xmits we will tolerate, | |
722 | * before we will start throttling | |
723 | * | |
724 | * Returns true iff the number of unacked xmits sent to | |
725 | * the IO partition is >= high_watermark. | |
726 | */ | |
727 | static inline bool vnic_hit_high_watermark(struct visornic_devdata *devdata, | |
728 | ulong high_watermark) | |
729 | { | |
730 | return (devdata_xmits_outstanding(devdata) >= high_watermark); | |
731 | } | |
732 | ||
733 | /** | |
734 | * vnic_hit_low_watermark | |
735 | * @devdata: indicates visornic device we are checking | |
736 | * @low_watermark: we will wait until the num of unacked xmits | |
737 | * drops to this value or lower before we start | |
738 | * transmitting again | |
739 | * | |
740 | * Returns true iff the number of unacked xmits sent to | |
741 | * the IO partition is <= low_watermark. | |
742 | */ | |
743 | static inline bool vnic_hit_low_watermark(struct visornic_devdata *devdata, | |
744 | ulong low_watermark) | |
745 | { | |
746 | return (devdata_xmits_outstanding(devdata) <= low_watermark); | |
747 | } | |
748 | ||
68905a14 DK |
749 | /** |
750 | * visornic_xmit - send a packet to the IO Partition | |
751 | * @skb: Packet to be sent | |
752 | * @netdev: net device the packet is being sent from | |
753 | * | |
754 | * Convert the skb to a cmdrsp so the IO Partition can undersand it. | |
755 | * Send the XMIT command to the IO Partition for processing. This | |
756 | * function is protected from concurrent calls by a spinlock xmit_lock | |
757 | * in the net_device struct, but as soon as the function returns it | |
758 | * can be called again. | |
f6346ad6 | 759 | * Returns NETDEV_TX_OK. |
68905a14 DK |
760 | */ |
761 | static int | |
762 | visornic_xmit(struct sk_buff *skb, struct net_device *netdev) | |
763 | { | |
764 | struct visornic_devdata *devdata; | |
765 | int len, firstfraglen, padlen; | |
766 | struct uiscmdrsp *cmdrsp = NULL; | |
767 | unsigned long flags; | |
768 | ||
769 | devdata = netdev_priv(netdev); | |
770 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
771 | ||
772 | if (netif_queue_stopped(netdev) || devdata->server_down || | |
773 | devdata->server_change_state) { | |
774 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
775 | devdata->busy_cnt++; | |
00748b0c TS |
776 | dev_dbg(&netdev->dev, |
777 | "%s busy - queue stopped\n", __func__); | |
f6346ad6 NH |
778 | kfree_skb(skb); |
779 | return NETDEV_TX_OK; | |
68905a14 DK |
780 | } |
781 | ||
782 | /* sk_buff struct is used to host network data throughout all the | |
783 | * linux network subsystems | |
784 | */ | |
785 | len = skb->len; | |
786 | ||
787 | /* skb->len is the FULL length of data (including fragmentary portion) | |
788 | * skb->data_len is the length of the fragment portion in frags | |
789 | * skb->len - skb->data_len is size of the 1st fragment in skb->data | |
790 | * calculate the length of the first fragment that skb->data is | |
791 | * pointing to | |
792 | */ | |
793 | firstfraglen = skb->len - skb->data_len; | |
794 | if (firstfraglen < ETH_HEADER_SIZE) { | |
795 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
796 | devdata->busy_cnt++; | |
00748b0c TS |
797 | dev_err(&netdev->dev, |
798 | "%s busy - first frag too small (%d)\n", | |
799 | __func__, firstfraglen); | |
f6346ad6 NH |
800 | kfree_skb(skb); |
801 | return NETDEV_TX_OK; | |
68905a14 DK |
802 | } |
803 | ||
804 | if ((len < ETH_MIN_PACKET_SIZE) && | |
805 | ((skb_end_pointer(skb) - skb->data) >= ETH_MIN_PACKET_SIZE)) { | |
806 | /* pad the packet out to minimum size */ | |
807 | padlen = ETH_MIN_PACKET_SIZE - len; | |
808 | memset(&skb->data[len], 0, padlen); | |
809 | skb->tail += padlen; | |
810 | skb->len += padlen; | |
811 | len += padlen; | |
812 | firstfraglen += padlen; | |
813 | } | |
814 | ||
815 | cmdrsp = devdata->xmit_cmdrsp; | |
816 | /* clear cmdrsp */ | |
817 | memset(cmdrsp, 0, SIZEOF_CMDRSP); | |
818 | cmdrsp->net.type = NET_XMIT; | |
819 | cmdrsp->cmdtype = CMD_NET_TYPE; | |
820 | ||
821 | /* save the pointer to skb -- we'll need it for completion */ | |
822 | cmdrsp->net.buf = skb; | |
823 | ||
36927c18 TS |
824 | if (vnic_hit_high_watermark(devdata, |
825 | devdata->max_outstanding_net_xmits)) { | |
77c9a4ae | 826 | /* extra NET_XMITs queued over to IOVM - need to wait */ |
68905a14 DK |
827 | devdata->chstat.reject_count++; |
828 | if (!devdata->queuefullmsg_logged && | |
829 | ((devdata->chstat.reject_count & 0x3ff) == 1)) | |
830 | devdata->queuefullmsg_logged = 1; | |
831 | netif_stop_queue(netdev); | |
832 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
833 | devdata->busy_cnt++; | |
00748b0c TS |
834 | dev_dbg(&netdev->dev, |
835 | "%s busy - waiting for iovm to catch up\n", | |
836 | __func__); | |
f6346ad6 NH |
837 | kfree_skb(skb); |
838 | return NETDEV_TX_OK; | |
68905a14 DK |
839 | } |
840 | if (devdata->queuefullmsg_logged) | |
841 | devdata->queuefullmsg_logged = 0; | |
842 | ||
843 | if (skb->ip_summed == CHECKSUM_UNNECESSARY) { | |
844 | cmdrsp->net.xmt.lincsum.valid = 1; | |
845 | cmdrsp->net.xmt.lincsum.protocol = skb->protocol; | |
846 | if (skb_transport_header(skb) > skb->data) { | |
847 | cmdrsp->net.xmt.lincsum.hrawoff = | |
848 | skb_transport_header(skb) - skb->data; | |
849 | cmdrsp->net.xmt.lincsum.hrawoff = 1; | |
850 | } | |
851 | if (skb_network_header(skb) > skb->data) { | |
852 | cmdrsp->net.xmt.lincsum.nhrawoff = | |
853 | skb_network_header(skb) - skb->data; | |
854 | cmdrsp->net.xmt.lincsum.nhrawoffv = 1; | |
855 | } | |
856 | cmdrsp->net.xmt.lincsum.csum = skb->csum; | |
857 | } else { | |
858 | cmdrsp->net.xmt.lincsum.valid = 0; | |
859 | } | |
860 | ||
861 | /* save off the length of the entire data packet */ | |
862 | cmdrsp->net.xmt.len = len; | |
863 | ||
864 | /* copy ethernet header from first frag into ocmdrsp | |
865 | * - everything else will be pass in frags & DMA'ed | |
866 | */ | |
867 | memcpy(cmdrsp->net.xmt.ethhdr, skb->data, ETH_HEADER_SIZE); | |
868 | /* copy frags info - from skb->data we need to only provide access | |
869 | * beyond eth header | |
870 | */ | |
871 | cmdrsp->net.xmt.num_frags = | |
872 | visor_copy_fragsinfo_from_skb(skb, firstfraglen, | |
873 | MAX_PHYS_INFO, | |
874 | cmdrsp->net.xmt.frags); | |
ce657aa8 | 875 | if (cmdrsp->net.xmt.num_frags < 0) { |
68905a14 DK |
876 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
877 | devdata->busy_cnt++; | |
00748b0c TS |
878 | dev_err(&netdev->dev, |
879 | "%s busy - copy frags failed\n", __func__); | |
f6346ad6 NH |
880 | kfree_skb(skb); |
881 | return NETDEV_TX_OK; | |
68905a14 DK |
882 | } |
883 | ||
264f7b8a DB |
884 | if (visorchannel_signalinsert(devdata->dev->visorchannel, |
885 | IOCHAN_TO_IOPART, cmdrsp)) { | |
68905a14 DK |
886 | netif_stop_queue(netdev); |
887 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
888 | devdata->busy_cnt++; | |
00748b0c TS |
889 | dev_dbg(&netdev->dev, |
890 | "%s busy - signalinsert failed\n", __func__); | |
f6346ad6 NH |
891 | kfree_skb(skb); |
892 | return NETDEV_TX_OK; | |
68905a14 DK |
893 | } |
894 | ||
895 | /* Track the skbs that have been sent to the IOVM for XMIT */ | |
896 | skb_queue_head(&devdata->xmitbufhead, skb); | |
897 | ||
68905a14 DK |
898 | /* update xmt stats */ |
899 | devdata->net_stats.tx_packets++; | |
900 | devdata->net_stats.tx_bytes += skb->len; | |
901 | devdata->chstat.sent_xmit++; | |
902 | ||
77c9a4ae | 903 | /* check if we have hit the high watermark for netif_stop_queue() */ |
36927c18 TS |
904 | if (vnic_hit_high_watermark(devdata, |
905 | devdata->upper_threshold_net_xmits)) { | |
77c9a4ae EA |
906 | /* extra NET_XMITs queued over to IOVM - need to wait */ |
907 | /* stop queue - call netif_wake_queue() after lower threshold */ | |
908 | netif_stop_queue(netdev); | |
00748b0c TS |
909 | dev_dbg(&netdev->dev, |
910 | "%s busy - invoking iovm flow control\n", | |
911 | __func__); | |
68905a14 DK |
912 | devdata->flow_control_upper_hits++; |
913 | } | |
914 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
915 | ||
916 | /* skb will be freed when we get back NET_XMIT_DONE */ | |
917 | return NETDEV_TX_OK; | |
918 | } | |
919 | ||
920 | /** | |
921 | * visornic_get_stats - returns net_stats of the visornic device | |
922 | * @netdev: netdevice | |
923 | * | |
924 | * Returns the net_device_stats for the device | |
925 | */ | |
926 | static struct net_device_stats * | |
927 | visornic_get_stats(struct net_device *netdev) | |
928 | { | |
929 | struct visornic_devdata *devdata = netdev_priv(netdev); | |
930 | ||
931 | return &devdata->net_stats; | |
932 | } | |
933 | ||
68905a14 DK |
934 | /** |
935 | * visornic_change_mtu - changes mtu of device. | |
936 | * @netdev: netdevice | |
937 | * @new_mtu: value of new mtu | |
938 | * | |
939 | * MTU cannot be changed by system, must be changed via | |
940 | * CONTROLVM message. All vnics and pnics in a switch have | |
941 | * to have the same MTU for everything to work. | |
942 | * Currently not supported. | |
943 | * Returns EINVAL | |
944 | */ | |
945 | static int | |
946 | visornic_change_mtu(struct net_device *netdev, int new_mtu) | |
947 | { | |
948 | return -EINVAL; | |
949 | } | |
950 | ||
951 | /** | |
952 | * visornic_set_multi - changes mtu of device. | |
953 | * @netdev: netdevice | |
954 | * | |
955 | * Only flag we support currently is IFF_PROMISC | |
956 | * Returns void | |
957 | */ | |
958 | static void | |
959 | visornic_set_multi(struct net_device *netdev) | |
960 | { | |
961 | struct uiscmdrsp *cmdrsp; | |
962 | struct visornic_devdata *devdata = netdev_priv(netdev); | |
963 | ||
6d8c96cb DB |
964 | if (devdata->old_flags == netdev->flags) |
965 | return; | |
966 | ||
967 | if ((netdev->flags & IFF_PROMISC) == | |
968 | (devdata->old_flags & IFF_PROMISC)) | |
969 | goto out_save_flags; | |
970 | ||
971 | cmdrsp = kmalloc(SIZEOF_CMDRSP, GFP_ATOMIC); | |
972 | if (!cmdrsp) | |
973 | return; | |
974 | cmdrsp->cmdtype = CMD_NET_TYPE; | |
975 | cmdrsp->net.type = NET_RCV_PROMISC; | |
976 | cmdrsp->net.enbdis.context = netdev; | |
977 | cmdrsp->net.enbdis.enable = | |
978 | netdev->flags & IFF_PROMISC; | |
979 | visorchannel_signalinsert(devdata->dev->visorchannel, | |
980 | IOCHAN_TO_IOPART, | |
981 | cmdrsp); | |
982 | kfree(cmdrsp); | |
983 | ||
984 | out_save_flags: | |
985 | devdata->old_flags = netdev->flags; | |
68905a14 DK |
986 | } |
987 | ||
988 | /** | |
989 | * visornic_xmit_timeout - request to timeout the xmit | |
990 | * @netdev | |
991 | * | |
992 | * Queue the work and return. Make sure we have not already | |
993 | * been informed the IO Partition is gone, if it is gone | |
994 | * we will already timeout the xmits. | |
995 | */ | |
996 | static void | |
997 | visornic_xmit_timeout(struct net_device *netdev) | |
998 | { | |
999 | struct visornic_devdata *devdata = netdev_priv(netdev); | |
1000 | unsigned long flags; | |
1001 | ||
1002 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
46df8226 TS |
1003 | if (devdata->going_away) { |
1004 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1005 | dev_dbg(&devdata->dev->device, | |
1006 | "%s aborting because device removal pending\n", | |
1007 | __func__); | |
1008 | return; | |
1009 | } | |
1010 | ||
68905a14 DK |
1011 | /* Ensure that a ServerDown message hasn't been received */ |
1012 | if (!devdata->enabled || | |
1013 | (devdata->server_down && !devdata->server_change_state)) { | |
00748b0c TS |
1014 | dev_dbg(&netdev->dev, "%s no processing\n", |
1015 | __func__); | |
68905a14 DK |
1016 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
1017 | return; | |
1018 | } | |
ce388d7e | 1019 | schedule_work(&devdata->timeout_reset); |
46df8226 | 1020 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
68905a14 DK |
1021 | } |
1022 | ||
1023 | /** | |
1024 | * repost_return - repost rcv bufs that have come back | |
1025 | * @cmdrsp: io channel command struct to post | |
1026 | * @devdata: visornic devdata for the device | |
1027 | * @skb: skb | |
1028 | * @netdev: netdevice | |
1029 | * | |
1030 | * Repost rcv buffers that have been returned to us when | |
1031 | * we are finished with them. | |
1032 | * Returns 0 for success, -1 for error. | |
1033 | */ | |
1034 | static inline int | |
1035 | repost_return(struct uiscmdrsp *cmdrsp, struct visornic_devdata *devdata, | |
1036 | struct sk_buff *skb, struct net_device *netdev) | |
1037 | { | |
1038 | struct net_pkt_rcv copy; | |
1039 | int i = 0, cc, numreposted; | |
1040 | int found_skb = 0; | |
1041 | int status = 0; | |
1042 | ||
1043 | copy = cmdrsp->net.rcv; | |
1044 | switch (copy.numrcvbufs) { | |
1045 | case 0: | |
1046 | devdata->n_rcv0++; | |
1047 | break; | |
1048 | case 1: | |
1049 | devdata->n_rcv1++; | |
1050 | break; | |
1051 | case 2: | |
1052 | devdata->n_rcv2++; | |
1053 | break; | |
1054 | default: | |
1055 | devdata->n_rcvx++; | |
1056 | break; | |
1057 | } | |
1058 | for (cc = 0, numreposted = 0; cc < copy.numrcvbufs; cc++) { | |
1059 | for (i = 0; i < devdata->num_rcv_bufs; i++) { | |
1060 | if (devdata->rcvbuf[i] != copy.rcvbuf[cc]) | |
1061 | continue; | |
1062 | ||
1063 | if ((skb) && devdata->rcvbuf[i] == skb) { | |
1064 | devdata->found_repost_rcvbuf_cnt++; | |
1065 | found_skb = 1; | |
1066 | devdata->repost_found_skb_cnt++; | |
1067 | } | |
1068 | devdata->rcvbuf[i] = alloc_rcv_buf(netdev); | |
1069 | if (!devdata->rcvbuf[i]) { | |
1070 | devdata->num_rcv_bufs_could_not_alloc++; | |
1071 | devdata->alloc_failed_in_repost_rtn_cnt++; | |
1072 | status = -ENOMEM; | |
1073 | break; | |
1074 | } | |
1075 | post_skb(cmdrsp, devdata, devdata->rcvbuf[i]); | |
1076 | numreposted++; | |
1077 | break; | |
1078 | } | |
1079 | } | |
1080 | if (numreposted != copy.numrcvbufs) { | |
1081 | devdata->n_repost_deficit++; | |
1082 | status = -EINVAL; | |
1083 | } | |
1084 | if (skb) { | |
1085 | if (found_skb) { | |
1086 | kfree_skb(skb); | |
1087 | } else { | |
1088 | status = -EINVAL; | |
1089 | devdata->bad_rcv_buf++; | |
1090 | } | |
1091 | } | |
68905a14 DK |
1092 | return status; |
1093 | } | |
1094 | ||
1095 | /** | |
1096 | * visornic_rx - Handle receive packets coming back from IO Part | |
1097 | * @cmdrsp: Receive packet returned from IO Part | |
1098 | * | |
1099 | * Got a receive packet back from the IO Part, handle it and send | |
1100 | * it up the stack. | |
73e81350 | 1101 | * Returns 1 iff an skb was receieved, otherwise 0 |
68905a14 | 1102 | */ |
946b2546 | 1103 | static int |
68905a14 DK |
1104 | visornic_rx(struct uiscmdrsp *cmdrsp) |
1105 | { | |
1106 | struct visornic_devdata *devdata; | |
1107 | struct sk_buff *skb, *prev, *curr; | |
1108 | struct net_device *netdev; | |
946b2546 | 1109 | int cc, currsize, off; |
68905a14 DK |
1110 | struct ethhdr *eth; |
1111 | unsigned long flags; | |
68905a14 DK |
1112 | |
1113 | /* post new rcv buf to the other end using the cmdrsp we have at hand | |
1114 | * post it without holding lock - but we'll use the signal lock to | |
1115 | * synchronize the queue insert the cmdrsp that contains the net.rcv | |
1116 | * is the one we are using to repost, so copy the info we need from it. | |
1117 | */ | |
1118 | skb = cmdrsp->net.buf; | |
1119 | netdev = skb->dev; | |
1120 | ||
68905a14 DK |
1121 | devdata = netdev_priv(netdev); |
1122 | ||
1123 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
1124 | atomic_dec(&devdata->num_rcvbuf_in_iovm); | |
1125 | ||
68905a14 DK |
1126 | /* set length to how much was ACTUALLY received - |
1127 | * NOTE: rcv_done_len includes actual length of data rcvd | |
1128 | * including ethhdr | |
1129 | */ | |
1130 | skb->len = cmdrsp->net.rcv.rcv_done_len; | |
1131 | ||
f6b6a8ec DK |
1132 | /* update rcv stats - call it with priv_lock held */ |
1133 | devdata->net_stats.rx_packets++; | |
1134 | devdata->net_stats.rx_bytes += skb->len; | |
1135 | ||
68905a14 DK |
1136 | /* test enabled while holding lock */ |
1137 | if (!(devdata->enabled && devdata->enab_dis_acked)) { | |
1138 | /* don't process it unless we're in enable mode and until | |
1139 | * we've gotten an ACK saying the other end got our RCV enable | |
1140 | */ | |
1141 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1142 | repost_return(cmdrsp, devdata, skb, netdev); | |
73e81350 | 1143 | return 0; |
68905a14 DK |
1144 | } |
1145 | ||
1146 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1147 | ||
1148 | /* when skb was allocated, skb->dev, skb->data, skb->len and | |
1149 | * skb->data_len were setup. AND, data has already put into the | |
1150 | * skb (both first frag and in frags pages) | |
1151 | * NOTE: firstfragslen is the amount of data in skb->data and that | |
1152 | * which is not in nr_frags or frag_list. This is now simply | |
1153 | * RCVPOST_BUF_SIZE. bump tail to show how much data is in | |
1154 | * firstfrag & set data_len to show rest see if we have to chain | |
1155 | * frag_list. | |
1156 | */ | |
1157 | if (skb->len > RCVPOST_BUF_SIZE) { /* do PRECAUTIONARY check */ | |
1158 | if (cmdrsp->net.rcv.numrcvbufs < 2) { | |
1159 | if (repost_return(cmdrsp, devdata, skb, netdev) < 0) | |
1160 | dev_err(&devdata->netdev->dev, | |
1161 | "repost_return failed"); | |
73e81350 | 1162 | return 0; |
68905a14 DK |
1163 | } |
1164 | /* length rcvd is greater than firstfrag in this skb rcv buf */ | |
1165 | skb->tail += RCVPOST_BUF_SIZE; /* amount in skb->data */ | |
1166 | skb->data_len = skb->len - RCVPOST_BUF_SIZE; /* amount that | |
abbceb61 EA |
1167 | * will be in |
1168 | * frag_list | |
1169 | */ | |
68905a14 DK |
1170 | } else { |
1171 | /* data fits in this skb - no chaining - do | |
1172 | * PRECAUTIONARY check | |
1173 | */ | |
1174 | if (cmdrsp->net.rcv.numrcvbufs != 1) { /* should be 1 */ | |
1175 | if (repost_return(cmdrsp, devdata, skb, netdev) < 0) | |
1176 | dev_err(&devdata->netdev->dev, | |
1177 | "repost_return failed"); | |
73e81350 | 1178 | return 0; |
68905a14 DK |
1179 | } |
1180 | skb->tail += skb->len; | |
1181 | skb->data_len = 0; /* nothing rcvd in frag_list */ | |
1182 | } | |
1183 | off = skb_tail_pointer(skb) - skb->data; | |
1184 | ||
1185 | /* amount we bumped tail by in the head skb | |
1186 | * it is used to calculate the size of each chained skb below | |
1187 | * it is also used to index into bufline to continue the copy | |
1188 | * (for chansocktwopc) | |
1189 | * if necessary chain the rcv skbs together. | |
1190 | * NOTE: index 0 has the same as cmdrsp->net.rcv.skb; we need to | |
1191 | * chain the rest to that one. | |
1192 | * - do PRECAUTIONARY check | |
1193 | */ | |
1194 | if (cmdrsp->net.rcv.rcvbuf[0] != skb) { | |
1195 | if (repost_return(cmdrsp, devdata, skb, netdev) < 0) | |
1196 | dev_err(&devdata->netdev->dev, "repost_return failed"); | |
73e81350 | 1197 | return 0; |
68905a14 DK |
1198 | } |
1199 | ||
1200 | if (cmdrsp->net.rcv.numrcvbufs > 1) { | |
1201 | /* chain the various rcv buffers into the skb's frag_list. */ | |
1202 | /* Note: off was initialized above */ | |
1203 | for (cc = 1, prev = NULL; | |
1204 | cc < cmdrsp->net.rcv.numrcvbufs; cc++) { | |
1205 | curr = (struct sk_buff *)cmdrsp->net.rcv.rcvbuf[cc]; | |
1206 | curr->next = NULL; | |
1207 | if (!prev) /* start of list- set head */ | |
1208 | skb_shinfo(skb)->frag_list = curr; | |
1209 | else | |
1210 | prev->next = curr; | |
1211 | prev = curr; | |
1212 | ||
1213 | /* should we set skb->len and skb->data_len for each | |
1214 | * buffer being chained??? can't hurt! | |
1215 | */ | |
1216 | currsize = min(skb->len - off, | |
1217 | (unsigned int)RCVPOST_BUF_SIZE); | |
1218 | curr->len = currsize; | |
1219 | curr->tail += currsize; | |
1220 | curr->data_len = 0; | |
1221 | off += currsize; | |
1222 | } | |
68905a14 DK |
1223 | /* assert skb->len == off */ |
1224 | if (skb->len != off) { | |
cb84fca0 TS |
1225 | netdev_err(devdata->netdev, |
1226 | "something wrong; skb->len:%d != off:%d\n", | |
1227 | skb->len, off); | |
68905a14 | 1228 | } |
68905a14 DK |
1229 | } |
1230 | ||
1231 | /* set up packet's protocl type using ethernet header - this | |
1232 | * sets up skb->pkt_type & it also PULLS out the eth header | |
1233 | */ | |
1234 | skb->protocol = eth_type_trans(skb, netdev); | |
1235 | ||
1236 | eth = eth_hdr(skb); | |
1237 | ||
1238 | skb->csum = 0; | |
1239 | skb->ip_summed = CHECKSUM_NONE; | |
1240 | ||
1241 | do { | |
1242 | if (netdev->flags & IFF_PROMISC) | |
1243 | break; /* accept all packets */ | |
1244 | if (skb->pkt_type == PACKET_BROADCAST) { | |
1245 | if (netdev->flags & IFF_BROADCAST) | |
1246 | break; /* accept all broadcast packets */ | |
1247 | } else if (skb->pkt_type == PACKET_MULTICAST) { | |
1248 | if ((netdev->flags & IFF_MULTICAST) && | |
1249 | (netdev_mc_count(netdev))) { | |
1250 | struct netdev_hw_addr *ha; | |
1251 | int found_mc = 0; | |
1252 | ||
1253 | /* only accept multicast packets that we can | |
1254 | * find in our multicast address list | |
1255 | */ | |
1256 | netdev_for_each_mc_addr(ha, netdev) { | |
1257 | if (ether_addr_equal(eth->h_dest, | |
1258 | ha->addr)) { | |
1259 | found_mc = 1; | |
1260 | break; | |
1261 | } | |
1262 | } | |
77c9a4ae | 1263 | /* accept pkt, dest matches a multicast addr */ |
68905a14 | 1264 | if (found_mc) |
77c9a4ae | 1265 | break; |
68905a14 | 1266 | } |
77c9a4ae | 1267 | /* accept packet, h_dest must match vnic mac address */ |
68905a14 | 1268 | } else if (skb->pkt_type == PACKET_HOST) { |
77c9a4ae | 1269 | break; |
68905a14 DK |
1270 | } else if (skb->pkt_type == PACKET_OTHERHOST) { |
1271 | /* something is not right */ | |
1272 | dev_err(&devdata->netdev->dev, | |
1273 | "**** FAILED to deliver rcv packet to OS; name:%s Dest:%pM VNIC:%pM\n", | |
1274 | netdev->name, eth->h_dest, netdev->dev_addr); | |
1275 | } | |
1276 | /* drop packet - don't forward it up to OS */ | |
1277 | devdata->n_rcv_packets_not_accepted++; | |
1278 | repost_return(cmdrsp, devdata, skb, netdev); | |
73e81350 | 1279 | return 0; |
68905a14 DK |
1280 | } while (0); |
1281 | ||
946b2546 | 1282 | netif_receive_skb(skb); |
68905a14 DK |
1283 | /* netif_rx returns various values, but "in practice most drivers |
1284 | * ignore the return value | |
1285 | */ | |
1286 | ||
1287 | skb = NULL; | |
1288 | /* | |
1289 | * whether the packet got dropped or handled, the skb is freed by | |
1290 | * kernel code, so we shouldn't free it. but we should repost a | |
1291 | * new rcv buffer. | |
1292 | */ | |
1293 | repost_return(cmdrsp, devdata, skb, netdev); | |
73e81350 | 1294 | return 1; |
68905a14 DK |
1295 | } |
1296 | ||
1297 | /** | |
1298 | * devdata_initialize - Initialize devdata structure | |
1299 | * @devdata: visornic_devdata structure to initialize | |
1300 | * #dev: visorbus_deviced it belongs to | |
1301 | * | |
1302 | * Setup initial values for the visornic based on channel and default | |
1303 | * values. | |
e1834bd0 | 1304 | * Returns a pointer to the devdata structure |
68905a14 DK |
1305 | */ |
1306 | static struct visornic_devdata * | |
1307 | devdata_initialize(struct visornic_devdata *devdata, struct visor_device *dev) | |
1308 | { | |
68905a14 | 1309 | devdata->dev = dev; |
91678f37 | 1310 | devdata->incarnation_id = get_jiffies_64(); |
68905a14 DK |
1311 | return devdata; |
1312 | } | |
1313 | ||
1314 | /** | |
8d0119d8 TS |
1315 | * devdata_release - Frees up references in devdata |
1316 | * @devdata: struct to clean up | |
68905a14 | 1317 | * |
8d0119d8 | 1318 | * Frees up references in devdata. |
68905a14 DK |
1319 | * Returns void |
1320 | */ | |
8d0119d8 | 1321 | static void devdata_release(struct visornic_devdata *devdata) |
68905a14 | 1322 | { |
46df8226 TS |
1323 | kfree(devdata->rcvbuf); |
1324 | kfree(devdata->cmdrsp_rcv); | |
1325 | kfree(devdata->xmit_cmdrsp); | |
68905a14 DK |
1326 | } |
1327 | ||
1328 | static const struct net_device_ops visornic_dev_ops = { | |
1329 | .ndo_open = visornic_open, | |
1330 | .ndo_stop = visornic_close, | |
1331 | .ndo_start_xmit = visornic_xmit, | |
1332 | .ndo_get_stats = visornic_get_stats, | |
68905a14 DK |
1333 | .ndo_change_mtu = visornic_change_mtu, |
1334 | .ndo_tx_timeout = visornic_xmit_timeout, | |
1335 | .ndo_set_rx_mode = visornic_set_multi, | |
1336 | }; | |
1337 | ||
52b1660d NH |
1338 | /* DebugFS code */ |
1339 | static ssize_t info_debugfs_read(struct file *file, char __user *buf, | |
1340 | size_t len, loff_t *offset) | |
1341 | { | |
1342 | ssize_t bytes_read = 0; | |
1343 | int str_pos = 0; | |
1344 | struct visornic_devdata *devdata; | |
1345 | struct net_device *dev; | |
1346 | char *vbuf; | |
1347 | ||
1348 | if (len > MAX_BUF) | |
1349 | len = MAX_BUF; | |
1350 | vbuf = kzalloc(len, GFP_KERNEL); | |
1351 | if (!vbuf) | |
1352 | return -ENOMEM; | |
1353 | ||
77c9a4ae | 1354 | /* for each vnic channel dump out channel specific data */ |
52b1660d NH |
1355 | rcu_read_lock(); |
1356 | for_each_netdev_rcu(current->nsproxy->net_ns, dev) { | |
77c9a4ae | 1357 | /* Only consider netdevs that are visornic, and are open */ |
52b1660d NH |
1358 | if ((dev->netdev_ops != &visornic_dev_ops) || |
1359 | (!netif_queue_stopped(dev))) | |
1360 | continue; | |
1361 | ||
1362 | devdata = netdev_priv(dev); | |
1363 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1364 | "netdev = %s (0x%p), MAC Addr %pM\n", | |
1365 | dev->name, | |
1366 | dev, | |
1367 | dev->dev_addr); | |
1368 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1369 | "VisorNic Dev Info = 0x%p\n", devdata); | |
1370 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1371 | " num_rcv_bufs = %d\n", | |
1372 | devdata->num_rcv_bufs); | |
1373 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
36927c18 | 1374 | " max_oustanding_next_xmits = %lu\n", |
52b1660d NH |
1375 | devdata->max_outstanding_net_xmits); |
1376 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
36927c18 | 1377 | " upper_threshold_net_xmits = %lu\n", |
52b1660d NH |
1378 | devdata->upper_threshold_net_xmits); |
1379 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
36927c18 | 1380 | " lower_threshold_net_xmits = %lu\n", |
52b1660d NH |
1381 | devdata->lower_threshold_net_xmits); |
1382 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1383 | " queuefullmsg_logged = %d\n", | |
1384 | devdata->queuefullmsg_logged); | |
1385 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1386 | " chstat.got_rcv = %lu\n", | |
1387 | devdata->chstat.got_rcv); | |
1388 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1389 | " chstat.got_enbdisack = %lu\n", | |
1390 | devdata->chstat.got_enbdisack); | |
1391 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1392 | " chstat.got_xmit_done = %lu\n", | |
1393 | devdata->chstat.got_xmit_done); | |
1394 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1395 | " chstat.xmit_fail = %lu\n", | |
1396 | devdata->chstat.xmit_fail); | |
1397 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1398 | " chstat.sent_enbdis = %lu\n", | |
1399 | devdata->chstat.sent_enbdis); | |
1400 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1401 | " chstat.sent_promisc = %lu\n", | |
1402 | devdata->chstat.sent_promisc); | |
1403 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1404 | " chstat.sent_post = %lu\n", | |
1405 | devdata->chstat.sent_post); | |
81d275c6 TS |
1406 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, |
1407 | " chstat.sent_post_failed = %lu\n", | |
1408 | devdata->chstat.sent_post_failed); | |
52b1660d NH |
1409 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, |
1410 | " chstat.sent_xmit = %lu\n", | |
1411 | devdata->chstat.sent_xmit); | |
1412 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1413 | " chstat.reject_count = %lu\n", | |
1414 | devdata->chstat.reject_count); | |
1415 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1416 | " chstat.extra_rcvbufs_sent = %lu\n", | |
1417 | devdata->chstat.extra_rcvbufs_sent); | |
1418 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1419 | " n_rcv0 = %lu\n", devdata->n_rcv0); | |
1420 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1421 | " n_rcv1 = %lu\n", devdata->n_rcv1); | |
1422 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1423 | " n_rcv2 = %lu\n", devdata->n_rcv2); | |
1424 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1425 | " n_rcvx = %lu\n", devdata->n_rcvx); | |
1426 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1427 | " num_rcvbuf_in_iovm = %d\n", | |
1428 | atomic_read(&devdata->num_rcvbuf_in_iovm)); | |
1429 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1430 | " alloc_failed_in_if_needed_cnt = %lu\n", | |
1431 | devdata->alloc_failed_in_if_needed_cnt); | |
1432 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1433 | " alloc_failed_in_repost_rtn_cnt = %lu\n", | |
1434 | devdata->alloc_failed_in_repost_rtn_cnt); | |
1435 | /* str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1436 | * " inner_loop_limit_reached_cnt = %lu\n", | |
1437 | * devdata->inner_loop_limit_reached_cnt); | |
1438 | */ | |
1439 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1440 | " found_repost_rcvbuf_cnt = %lu\n", | |
1441 | devdata->found_repost_rcvbuf_cnt); | |
1442 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1443 | " repost_found_skb_cnt = %lu\n", | |
1444 | devdata->repost_found_skb_cnt); | |
1445 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1446 | " n_repost_deficit = %lu\n", | |
1447 | devdata->n_repost_deficit); | |
1448 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1449 | " bad_rcv_buf = %lu\n", | |
1450 | devdata->bad_rcv_buf); | |
1451 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1452 | " n_rcv_packets_not_accepted = %lu\n", | |
1453 | devdata->n_rcv_packets_not_accepted); | |
1454 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1455 | " interrupts_rcvd = %llu\n", | |
1456 | devdata->interrupts_rcvd); | |
1457 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1458 | " interrupts_notme = %llu\n", | |
1459 | devdata->interrupts_notme); | |
1460 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1461 | " interrupts_disabled = %llu\n", | |
1462 | devdata->interrupts_disabled); | |
1463 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1464 | " busy_cnt = %llu\n", | |
1465 | devdata->busy_cnt); | |
1466 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1467 | " flow_control_upper_hits = %llu\n", | |
1468 | devdata->flow_control_upper_hits); | |
1469 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, | |
1470 | " flow_control_lower_hits = %llu\n", | |
1471 | devdata->flow_control_lower_hits); | |
52b1660d NH |
1472 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, |
1473 | " netif_queue = %s\n", | |
1474 | netif_queue_stopped(devdata->netdev) ? | |
1475 | "stopped" : "running"); | |
36927c18 TS |
1476 | str_pos += scnprintf(vbuf + str_pos, len - str_pos, |
1477 | " xmits_outstanding = %lu\n", | |
1478 | devdata_xmits_outstanding(devdata)); | |
52b1660d NH |
1479 | } |
1480 | rcu_read_unlock(); | |
1481 | bytes_read = simple_read_from_buffer(buf, len, offset, vbuf, str_pos); | |
1482 | kfree(vbuf); | |
1483 | return bytes_read; | |
1484 | } | |
1485 | ||
0543205b DK |
1486 | static struct dentry *visornic_debugfs_dir; |
1487 | static const struct file_operations debugfs_info_fops = { | |
1488 | .read = info_debugfs_read, | |
1489 | }; | |
1490 | ||
68905a14 DK |
1491 | /** |
1492 | * send_rcv_posts_if_needed | |
1493 | * @devdata: visornic device | |
1494 | * | |
1495 | * Send receive buffers to the IO Partition. | |
1496 | * Returns void | |
1497 | */ | |
1498 | static void | |
1499 | send_rcv_posts_if_needed(struct visornic_devdata *devdata) | |
1500 | { | |
1501 | int i; | |
1502 | struct net_device *netdev; | |
1503 | struct uiscmdrsp *cmdrsp = devdata->cmdrsp_rcv; | |
1504 | int cur_num_rcv_bufs_to_alloc, rcv_bufs_allocated; | |
1505 | ||
1506 | /* don't do this until vnic is marked ready */ | |
1507 | if (!(devdata->enabled && devdata->enab_dis_acked)) | |
1508 | return; | |
1509 | ||
1510 | netdev = devdata->netdev; | |
1511 | rcv_bufs_allocated = 0; | |
1512 | /* this code is trying to prevent getting stuck here forever, | |
1513 | * but still retry it if you cant allocate them all this time. | |
1514 | */ | |
1515 | cur_num_rcv_bufs_to_alloc = devdata->num_rcv_bufs_could_not_alloc; | |
1516 | while (cur_num_rcv_bufs_to_alloc > 0) { | |
1517 | cur_num_rcv_bufs_to_alloc--; | |
1518 | for (i = 0; i < devdata->num_rcv_bufs; i++) { | |
1519 | if (devdata->rcvbuf[i]) | |
1520 | continue; | |
1521 | devdata->rcvbuf[i] = alloc_rcv_buf(netdev); | |
1522 | if (!devdata->rcvbuf[i]) { | |
1523 | devdata->alloc_failed_in_if_needed_cnt++; | |
1524 | break; | |
1525 | } | |
1526 | rcv_bufs_allocated++; | |
1527 | post_skb(cmdrsp, devdata, devdata->rcvbuf[i]); | |
1528 | devdata->chstat.extra_rcvbufs_sent++; | |
1529 | } | |
1530 | } | |
1531 | devdata->num_rcv_bufs_could_not_alloc -= rcv_bufs_allocated; | |
1532 | } | |
1533 | ||
1534 | /** | |
91678f37 TS |
1535 | * drain_resp_queue - drains and ignores all messages from the resp queue |
1536 | * @cmdrsp: io channel command response message | |
1537 | * @devdata: visornic device to drain | |
1538 | */ | |
1539 | static void | |
1540 | drain_resp_queue(struct uiscmdrsp *cmdrsp, struct visornic_devdata *devdata) | |
1541 | { | |
f621a968 DB |
1542 | while (!visorchannel_signalremove(devdata->dev->visorchannel, |
1543 | IOCHAN_FROM_IOPART, | |
1544 | cmdrsp)) | |
91678f37 TS |
1545 | ; |
1546 | } | |
1547 | ||
1548 | /** | |
1549 | * service_resp_queue - drains the response queue | |
68905a14 DK |
1550 | * @cmdrsp: io channel command response message |
1551 | * @devdata: visornic device to drain | |
1552 | * | |
1553 | * Drain the respones queue of any responses from the IO partition. | |
1554 | * Process the responses as we get them. | |
ab301265 | 1555 | * Returns when response queue is empty or when the thread stops. |
68905a14 DK |
1556 | */ |
1557 | static void | |
946b2546 | 1558 | service_resp_queue(struct uiscmdrsp *cmdrsp, struct visornic_devdata *devdata, |
61dd330a | 1559 | int *rx_work_done, int budget) |
68905a14 DK |
1560 | { |
1561 | unsigned long flags; | |
1562 | struct net_device *netdev; | |
1563 | ||
61dd330a | 1564 | while (*rx_work_done < budget) { |
abbceb61 EA |
1565 | /* TODO: CLIENT ACQUIRE -- Don't really need this at the |
1566 | * moment | |
1567 | */ | |
f621a968 DB |
1568 | if (visorchannel_signalremove(devdata->dev->visorchannel, |
1569 | IOCHAN_FROM_IOPART, | |
1570 | cmdrsp)) | |
7c03621a DK |
1571 | break; /* queue empty */ |
1572 | ||
1573 | switch (cmdrsp->net.type) { | |
1574 | case NET_RCV: | |
1575 | devdata->chstat.got_rcv++; | |
1576 | /* process incoming packet */ | |
946b2546 | 1577 | *rx_work_done += visornic_rx(cmdrsp); |
7c03621a DK |
1578 | break; |
1579 | case NET_XMIT_DONE: | |
1580 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
1581 | devdata->chstat.got_xmit_done++; | |
1582 | if (cmdrsp->net.xmtdone.xmt_done_result) | |
1583 | devdata->chstat.xmit_fail++; | |
1584 | /* only call queue wake if we stopped it */ | |
1585 | netdev = ((struct sk_buff *)cmdrsp->net.buf)->dev; | |
1586 | /* ASSERT netdev == vnicinfo->netdev; */ | |
1587 | if ((netdev == devdata->netdev) && | |
1588 | netif_queue_stopped(netdev)) { | |
77c9a4ae EA |
1589 | /* check if we have crossed the lower watermark |
1590 | * for netif_wake_queue() | |
68905a14 | 1591 | */ |
dc38082f TS |
1592 | if (vnic_hit_low_watermark |
1593 | (devdata, | |
1594 | devdata->lower_threshold_net_xmits)) { | |
7c03621a DK |
1595 | /* enough NET_XMITs completed |
1596 | * so can restart netif queue | |
1597 | */ | |
1598 | netif_wake_queue(netdev); | |
1599 | devdata->flow_control_lower_hits++; | |
1600 | } | |
68905a14 | 1601 | } |
7c03621a DK |
1602 | skb_unlink(cmdrsp->net.buf, &devdata->xmitbufhead); |
1603 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1604 | kfree_skb(cmdrsp->net.buf); | |
68905a14 | 1605 | break; |
7c03621a DK |
1606 | case NET_RCV_ENBDIS_ACK: |
1607 | devdata->chstat.got_enbdisack++; | |
1608 | netdev = (struct net_device *) | |
1609 | cmdrsp->net.enbdis.context; | |
87a9404e | 1610 | spin_lock_irqsave(&devdata->priv_lock, flags); |
7c03621a DK |
1611 | devdata->enab_dis_acked = 1; |
1612 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1613 | ||
7c03621a DK |
1614 | if (devdata->server_down && |
1615 | devdata->server_change_state) { | |
1616 | /* Inform Linux that the link is up */ | |
1617 | devdata->server_down = false; | |
1618 | devdata->server_change_state = false; | |
1619 | netif_wake_queue(netdev); | |
1620 | netif_carrier_on(netdev); | |
1621 | } | |
1622 | break; | |
1623 | case NET_CONNECT_STATUS: | |
1624 | netdev = devdata->netdev; | |
1625 | if (cmdrsp->net.enbdis.enable == 1) { | |
1626 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
1627 | devdata->enabled = cmdrsp->net.enbdis.enable; | |
1628 | spin_unlock_irqrestore(&devdata->priv_lock, | |
1629 | flags); | |
1630 | netif_wake_queue(netdev); | |
1631 | netif_carrier_on(netdev); | |
1632 | } else { | |
1633 | netif_stop_queue(netdev); | |
1634 | netif_carrier_off(netdev); | |
1635 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
1636 | devdata->enabled = cmdrsp->net.enbdis.enable; | |
1637 | spin_unlock_irqrestore(&devdata->priv_lock, | |
1638 | flags); | |
1639 | } | |
1640 | break; | |
1641 | default: | |
1642 | break; | |
87a9404e | 1643 | } |
7c03621a | 1644 | /* cmdrsp is now available for reuse */ |
68905a14 DK |
1645 | } |
1646 | } | |
1647 | ||
946b2546 NH |
1648 | static int visornic_poll(struct napi_struct *napi, int budget) |
1649 | { | |
1650 | struct visornic_devdata *devdata = container_of(napi, | |
1651 | struct visornic_devdata, | |
1652 | napi); | |
1653 | int rx_count = 0; | |
1654 | ||
1655 | send_rcv_posts_if_needed(devdata); | |
61dd330a | 1656 | service_resp_queue(devdata->cmdrsp, devdata, &rx_count, budget); |
946b2546 | 1657 | |
77c9a4ae | 1658 | /* If there aren't any more packets to receive stop the poll */ |
946b2546 NH |
1659 | if (rx_count < budget) |
1660 | napi_complete(napi); | |
1661 | ||
1662 | return rx_count; | |
1663 | } | |
1664 | ||
68905a14 | 1665 | /** |
946b2546 | 1666 | * poll_for_irq - Checks the status of the response queue. |
68905a14 DK |
1667 | * @v: void pointer to the visronic devdata |
1668 | * | |
1669 | * Main function of the vnic_incoming thread. Peridocially check the | |
1670 | * response queue and drain it if needed. | |
1671 | * Returns when thread has stopped. | |
1672 | */ | |
946b2546 NH |
1673 | static void |
1674 | poll_for_irq(unsigned long v) | |
68905a14 | 1675 | { |
946b2546 | 1676 | struct visornic_devdata *devdata = (struct visornic_devdata *)v; |
68905a14 | 1677 | |
946b2546 NH |
1678 | if (!visorchannel_signalempty( |
1679 | devdata->dev->visorchannel, | |
1680 | IOCHAN_FROM_IOPART)) | |
1681 | napi_schedule(&devdata->napi); | |
68905a14 | 1682 | |
946b2546 | 1683 | atomic_set(&devdata->interrupt_rcvd, 0); |
68905a14 | 1684 | |
946b2546 | 1685 | mod_timer(&devdata->irq_poll_timer, msecs_to_jiffies(2)); |
68905a14 DK |
1686 | } |
1687 | ||
1688 | /** | |
1689 | * visornic_probe - probe function for visornic devices | |
1690 | * @dev: The visor device discovered | |
1691 | * | |
1692 | * Called when visorbus discovers a visornic device on its | |
1693 | * bus. It creates a new visornic ethernet adapter. | |
1694 | * Returns 0 or negative for error. | |
1695 | */ | |
1696 | static int visornic_probe(struct visor_device *dev) | |
1697 | { | |
1698 | struct visornic_devdata *devdata = NULL; | |
1699 | struct net_device *netdev = NULL; | |
1700 | int err; | |
1701 | int channel_offset = 0; | |
1702 | u64 features; | |
1703 | ||
1704 | netdev = alloc_etherdev(sizeof(struct visornic_devdata)); | |
00748b0c TS |
1705 | if (!netdev) { |
1706 | dev_err(&dev->device, | |
1707 | "%s alloc_etherdev failed\n", __func__); | |
68905a14 | 1708 | return -ENOMEM; |
00748b0c | 1709 | } |
68905a14 DK |
1710 | |
1711 | netdev->netdev_ops = &visornic_dev_ops; | |
90cb147f | 1712 | netdev->watchdog_timeo = 5 * HZ; |
051e9fbb | 1713 | SET_NETDEV_DEV(netdev, &dev->device); |
68905a14 DK |
1714 | |
1715 | /* Get MAC adddress from channel and read it into the device. */ | |
1716 | netdev->addr_len = ETH_ALEN; | |
1717 | channel_offset = offsetof(struct spar_io_channel_protocol, | |
1718 | vnic.macaddr); | |
1719 | err = visorbus_read_channel(dev, channel_offset, netdev->dev_addr, | |
1720 | ETH_ALEN); | |
00748b0c TS |
1721 | if (err < 0) { |
1722 | dev_err(&dev->device, | |
1723 | "%s failed to get mac addr from chan (%d)\n", | |
1724 | __func__, err); | |
68905a14 | 1725 | goto cleanup_netdev; |
00748b0c | 1726 | } |
68905a14 DK |
1727 | |
1728 | devdata = devdata_initialize(netdev_priv(netdev), dev); | |
1729 | if (!devdata) { | |
00748b0c TS |
1730 | dev_err(&dev->device, |
1731 | "%s devdata_initialize failed\n", __func__); | |
68905a14 DK |
1732 | err = -ENOMEM; |
1733 | goto cleanup_netdev; | |
1734 | } | |
91678f37 TS |
1735 | /* don't trust messages laying around in the channel */ |
1736 | drain_resp_queue(devdata->cmdrsp, devdata); | |
68905a14 DK |
1737 | |
1738 | devdata->netdev = netdev; | |
5deeea33 | 1739 | dev_set_drvdata(&dev->device, devdata); |
68905a14 DK |
1740 | init_waitqueue_head(&devdata->rsp_queue); |
1741 | spin_lock_init(&devdata->priv_lock); | |
1742 | devdata->enabled = 0; /* not yet */ | |
1743 | atomic_set(&devdata->usage, 1); | |
1744 | ||
1745 | /* Setup rcv bufs */ | |
1746 | channel_offset = offsetof(struct spar_io_channel_protocol, | |
1747 | vnic.num_rcv_bufs); | |
1748 | err = visorbus_read_channel(dev, channel_offset, | |
1749 | &devdata->num_rcv_bufs, 4); | |
00748b0c TS |
1750 | if (err) { |
1751 | dev_err(&dev->device, | |
1752 | "%s failed to get #rcv bufs from chan (%d)\n", | |
1753 | __func__, err); | |
68905a14 | 1754 | goto cleanup_netdev; |
00748b0c | 1755 | } |
68905a14 | 1756 | |
5e757bc5 SB |
1757 | devdata->rcvbuf = kcalloc(devdata->num_rcv_bufs, |
1758 | sizeof(struct sk_buff *), GFP_KERNEL); | |
68905a14 DK |
1759 | if (!devdata->rcvbuf) { |
1760 | err = -ENOMEM; | |
d12324e3 | 1761 | goto cleanup_netdev; |
68905a14 DK |
1762 | } |
1763 | ||
1764 | /* set the net_xmit outstanding threshold */ | |
1765 | /* always leave two slots open but you should have 3 at a minimum */ | |
36927c18 | 1766 | /* note that max_outstanding_net_xmits must be > 0 */ |
68905a14 | 1767 | devdata->max_outstanding_net_xmits = |
36927c18 | 1768 | max_t(unsigned long, 3, ((devdata->num_rcv_bufs / 3) - 2)); |
68905a14 | 1769 | devdata->upper_threshold_net_xmits = |
36927c18 TS |
1770 | max_t(unsigned long, |
1771 | 2, (devdata->max_outstanding_net_xmits - 1)); | |
68905a14 | 1772 | devdata->lower_threshold_net_xmits = |
36927c18 TS |
1773 | max_t(unsigned long, |
1774 | 1, (devdata->max_outstanding_net_xmits / 2)); | |
68905a14 DK |
1775 | |
1776 | skb_queue_head_init(&devdata->xmitbufhead); | |
1777 | ||
1778 | /* create a cmdrsp we can use to post and unpost rcv buffers */ | |
1779 | devdata->cmdrsp_rcv = kmalloc(SIZEOF_CMDRSP, GFP_ATOMIC); | |
1780 | if (!devdata->cmdrsp_rcv) { | |
1781 | err = -ENOMEM; | |
d12324e3 | 1782 | goto cleanup_rcvbuf; |
68905a14 DK |
1783 | } |
1784 | devdata->xmit_cmdrsp = kmalloc(SIZEOF_CMDRSP, GFP_ATOMIC); | |
1785 | if (!devdata->xmit_cmdrsp) { | |
1786 | err = -ENOMEM; | |
d12324e3 | 1787 | goto cleanup_cmdrsp_rcv; |
68905a14 | 1788 | } |
68905a14 DK |
1789 | INIT_WORK(&devdata->timeout_reset, visornic_timeout_reset); |
1790 | devdata->server_down = false; | |
1791 | devdata->server_change_state = false; | |
1792 | ||
1793 | /*set the default mtu */ | |
1794 | channel_offset = offsetof(struct spar_io_channel_protocol, | |
1795 | vnic.mtu); | |
1796 | err = visorbus_read_channel(dev, channel_offset, &netdev->mtu, 4); | |
00748b0c TS |
1797 | if (err) { |
1798 | dev_err(&dev->device, | |
1799 | "%s failed to get mtu from chan (%d)\n", | |
1800 | __func__, err); | |
68905a14 | 1801 | goto cleanup_xmit_cmdrsp; |
00748b0c | 1802 | } |
68905a14 DK |
1803 | |
1804 | /* TODO: Setup Interrupt information */ | |
1805 | /* Let's start our threads to get responses */ | |
946b2546 NH |
1806 | netif_napi_add(netdev, &devdata->napi, visornic_poll, 64); |
1807 | ||
1808 | setup_timer(&devdata->irq_poll_timer, poll_for_irq, | |
1809 | (unsigned long)devdata); | |
77c9a4ae | 1810 | /* Note: This time has to start running before the while |
946b2546 NH |
1811 | * loop below because the napi routine is responsible for |
1812 | * setting enab_dis_acked | |
1813 | */ | |
1814 | mod_timer(&devdata->irq_poll_timer, msecs_to_jiffies(2)); | |
1815 | ||
68905a14 DK |
1816 | channel_offset = offsetof(struct spar_io_channel_protocol, |
1817 | channel_header.features); | |
1818 | err = visorbus_read_channel(dev, channel_offset, &features, 8); | |
00748b0c TS |
1819 | if (err) { |
1820 | dev_err(&dev->device, | |
1821 | "%s failed to get features from chan (%d)\n", | |
1822 | __func__, err); | |
946b2546 | 1823 | goto cleanup_napi_add; |
00748b0c | 1824 | } |
68905a14 DK |
1825 | |
1826 | features |= ULTRA_IO_CHANNEL_IS_POLLING; | |
91678f37 | 1827 | features |= ULTRA_IO_DRIVER_SUPPORTS_ENHANCED_RCVBUF_CHECKING; |
68905a14 | 1828 | err = visorbus_write_channel(dev, channel_offset, &features, 8); |
00748b0c TS |
1829 | if (err) { |
1830 | dev_err(&dev->device, | |
1831 | "%s failed to set features in chan (%d)\n", | |
1832 | __func__, err); | |
946b2546 | 1833 | goto cleanup_napi_add; |
00748b0c | 1834 | } |
68905a14 | 1835 | |
61dd330a DK |
1836 | /* Let's start our threads to get responses */ |
1837 | netif_napi_add(netdev, &devdata->napi, visornic_poll, NAPI_WEIGHT); | |
1838 | ||
77c9a4ae | 1839 | /* Note: Interupts have to be enable before the while |
61dd330a DK |
1840 | * loop below because the napi routine is responsible for |
1841 | * setting enab_dis_acked | |
1842 | */ | |
1843 | visorbus_enable_channel_interrupts(dev); | |
1844 | ||
68905a14 | 1845 | err = register_netdev(netdev); |
00748b0c TS |
1846 | if (err) { |
1847 | dev_err(&dev->device, | |
1848 | "%s register_netdev failed (%d)\n", __func__, err); | |
946b2546 | 1849 | goto cleanup_napi_add; |
00748b0c | 1850 | } |
68905a14 DK |
1851 | |
1852 | /* create debgug/sysfs directories */ | |
1853 | devdata->eth_debugfs_dir = debugfs_create_dir(netdev->name, | |
1854 | visornic_debugfs_dir); | |
1855 | if (!devdata->eth_debugfs_dir) { | |
00748b0c TS |
1856 | dev_err(&dev->device, |
1857 | "%s debugfs_create_dir %s failed\n", | |
1858 | __func__, netdev->name); | |
68905a14 | 1859 | err = -ENOMEM; |
5b12100a | 1860 | goto cleanup_register_netdev; |
68905a14 DK |
1861 | } |
1862 | ||
00748b0c TS |
1863 | dev_info(&dev->device, "%s success netdev=%s\n", |
1864 | __func__, netdev->name); | |
68905a14 DK |
1865 | return 0; |
1866 | ||
5b12100a DK |
1867 | cleanup_register_netdev: |
1868 | unregister_netdev(netdev); | |
1869 | ||
946b2546 NH |
1870 | cleanup_napi_add: |
1871 | del_timer_sync(&devdata->irq_poll_timer); | |
1872 | netif_napi_del(&devdata->napi); | |
1873 | ||
68905a14 DK |
1874 | cleanup_xmit_cmdrsp: |
1875 | kfree(devdata->xmit_cmdrsp); | |
1876 | ||
1877 | cleanup_cmdrsp_rcv: | |
1878 | kfree(devdata->cmdrsp_rcv); | |
1879 | ||
1880 | cleanup_rcvbuf: | |
1881 | kfree(devdata->rcvbuf); | |
1882 | ||
1883 | cleanup_netdev: | |
1884 | free_netdev(netdev); | |
1885 | return err; | |
1886 | } | |
1887 | ||
1888 | /** | |
1889 | * host_side_disappeared - IO part is gone. | |
1890 | * @devdata: device object | |
1891 | * | |
1892 | * IO partition servicing this device is gone, do cleanup | |
1893 | * Returns void. | |
1894 | */ | |
1895 | static void host_side_disappeared(struct visornic_devdata *devdata) | |
1896 | { | |
1897 | unsigned long flags; | |
1898 | ||
1899 | spin_lock_irqsave(&devdata->priv_lock, flags); | |
68905a14 DK |
1900 | devdata->dev = NULL; /* indicate device destroyed */ |
1901 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1902 | } | |
1903 | ||
1904 | /** | |
1905 | * visornic_remove - Called when visornic dev goes away | |
1906 | * @dev: visornic device that is being removed | |
1907 | * | |
1908 | * Called when DEVICE_DESTROY gets called to remove device. | |
1909 | * Returns void | |
1910 | */ | |
1911 | static void visornic_remove(struct visor_device *dev) | |
1912 | { | |
1913 | struct visornic_devdata *devdata = dev_get_drvdata(&dev->device); | |
46df8226 TS |
1914 | struct net_device *netdev; |
1915 | unsigned long flags; | |
68905a14 | 1916 | |
00748b0c TS |
1917 | if (!devdata) { |
1918 | dev_err(&dev->device, "%s no devdata\n", __func__); | |
68905a14 | 1919 | return; |
00748b0c | 1920 | } |
46df8226 TS |
1921 | spin_lock_irqsave(&devdata->priv_lock, flags); |
1922 | if (devdata->going_away) { | |
1923 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1924 | dev_err(&dev->device, "%s already being removed\n", __func__); | |
1925 | return; | |
1926 | } | |
1927 | devdata->going_away = true; | |
1928 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
1929 | netdev = devdata->netdev; | |
1930 | if (!netdev) { | |
1931 | dev_err(&dev->device, "%s not net device\n", __func__); | |
1932 | return; | |
1933 | } | |
1934 | ||
1935 | /* going_away prevents new items being added to the workqueues */ | |
ce388d7e | 1936 | cancel_work_sync(&devdata->timeout_reset); |
46df8226 TS |
1937 | |
1938 | debugfs_remove_recursive(devdata->eth_debugfs_dir); | |
1939 | ||
1940 | unregister_netdev(netdev); /* this will call visornic_close() */ | |
1941 | ||
946b2546 NH |
1942 | del_timer_sync(&devdata->irq_poll_timer); |
1943 | netif_napi_del(&devdata->napi); | |
46df8226 | 1944 | |
68905a14 DK |
1945 | dev_set_drvdata(&dev->device, NULL); |
1946 | host_side_disappeared(devdata); | |
8d0119d8 | 1947 | devdata_release(devdata); |
46df8226 | 1948 | free_netdev(netdev); |
68905a14 DK |
1949 | } |
1950 | ||
1951 | /** | |
1952 | * visornic_pause - Called when IO Part disappears | |
1953 | * @dev: visornic device that is being serviced | |
1954 | * @complete_func: call when finished. | |
1955 | * | |
1956 | * Called when the IO Partition has gone down. Need to free | |
1957 | * up resources and wait for IO partition to come back. Mark | |
1958 | * link as down and don't attempt any DMA. When we have freed | |
1959 | * memory call the complete_func so that Command knows we are | |
1960 | * done. If we don't call complete_func, IO part will never | |
1961 | * come back. | |
1962 | * Returns 0 for success. | |
1963 | */ | |
1964 | static int visornic_pause(struct visor_device *dev, | |
1965 | visorbus_state_complete_func complete_func) | |
1966 | { | |
1967 | struct visornic_devdata *devdata = dev_get_drvdata(&dev->device); | |
1968 | ||
d01da5ea | 1969 | visornic_serverdown(devdata, complete_func); |
68905a14 DK |
1970 | return 0; |
1971 | } | |
1972 | ||
1973 | /** | |
1974 | * visornic_resume - Called when IO part has recovered | |
1975 | * @dev: visornic device that is being serviced | |
1976 | * @compelte_func: call when finished | |
1977 | * | |
1978 | * Called when the IO partition has recovered. Reestablish | |
1979 | * connection to the IO part and set the link up. Okay to do | |
1980 | * DMA again. | |
1981 | * Returns 0 for success. | |
1982 | */ | |
1983 | static int visornic_resume(struct visor_device *dev, | |
1984 | visorbus_state_complete_func complete_func) | |
1985 | { | |
1986 | struct visornic_devdata *devdata; | |
1987 | struct net_device *netdev; | |
1988 | unsigned long flags; | |
1989 | ||
1990 | devdata = dev_get_drvdata(&dev->device); | |
00748b0c TS |
1991 | if (!devdata) { |
1992 | dev_err(&dev->device, "%s no devdata\n", __func__); | |
68905a14 | 1993 | return -EINVAL; |
00748b0c | 1994 | } |
68905a14 DK |
1995 | |
1996 | netdev = devdata->netdev; | |
1997 | ||
c847020e TS |
1998 | spin_lock_irqsave(&devdata->priv_lock, flags); |
1999 | if (devdata->server_change_state) { | |
68905a14 | 2000 | spin_unlock_irqrestore(&devdata->priv_lock, flags); |
c847020e | 2001 | dev_err(&dev->device, "%s server already changing state\n", |
00748b0c | 2002 | __func__); |
c847020e | 2003 | return -EINVAL; |
68905a14 | 2004 | } |
c847020e TS |
2005 | if (!devdata->server_down) { |
2006 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
2007 | dev_err(&dev->device, "%s server not down\n", __func__); | |
2008 | complete_func(dev, 0); | |
2009 | return 0; | |
2010 | } | |
2011 | devdata->server_change_state = true; | |
2012 | spin_unlock_irqrestore(&devdata->priv_lock, flags); | |
946b2546 | 2013 | |
c847020e TS |
2014 | /* Must transition channel to ATTACHED state BEFORE |
2015 | * we can start using the device again. | |
2016 | * TODO: State transitions | |
2017 | */ | |
946b2546 NH |
2018 | mod_timer(&devdata->irq_poll_timer, msecs_to_jiffies(2)); |
2019 | ||
2020 | init_rcv_bufs(netdev, devdata); | |
c847020e TS |
2021 | |
2022 | rtnl_lock(); | |
2023 | dev_open(netdev); | |
2024 | rtnl_unlock(); | |
68905a14 DK |
2025 | |
2026 | complete_func(dev, 0); | |
2027 | return 0; | |
2028 | } | |
2029 | ||
6083c710 DK |
2030 | /* This is used to tell the visor bus driver which types of visor devices |
2031 | * we support, and what functions to call when a visor device that we support | |
2032 | * is attached or removed. | |
2033 | */ | |
2034 | static struct visor_driver visornic_driver = { | |
2035 | .name = "visornic", | |
6083c710 DK |
2036 | .owner = THIS_MODULE, |
2037 | .channel_types = visornic_channel_types, | |
2038 | .probe = visornic_probe, | |
2039 | .remove = visornic_remove, | |
2040 | .pause = visornic_pause, | |
2041 | .resume = visornic_resume, | |
2042 | .channel_interrupt = NULL, | |
2043 | }; | |
2044 | ||
68905a14 DK |
2045 | /** |
2046 | * visornic_init - Init function | |
2047 | * | |
2048 | * Init function for the visornic driver. Do initial driver setup | |
2049 | * and wait for devices. | |
2050 | * Returns 0 for success, negative for error. | |
2051 | */ | |
2052 | static int visornic_init(void) | |
2053 | { | |
2054 | struct dentry *ret; | |
2055 | int err = -ENOMEM; | |
2056 | ||
68905a14 DK |
2057 | visornic_debugfs_dir = debugfs_create_dir("visornic", NULL); |
2058 | if (!visornic_debugfs_dir) | |
2059 | return err; | |
2060 | ||
2061 | ret = debugfs_create_file("info", S_IRUSR, visornic_debugfs_dir, NULL, | |
2062 | &debugfs_info_fops); | |
2063 | if (!ret) | |
2064 | goto cleanup_debugfs; | |
2065 | ret = debugfs_create_file("enable_ints", S_IWUSR, visornic_debugfs_dir, | |
2066 | NULL, &debugfs_enable_ints_fops); | |
2067 | if (!ret) | |
2068 | goto cleanup_debugfs; | |
2069 | ||
8b5081c8 | 2070 | err = visorbus_register_visor_driver(&visornic_driver); |
186896fd DB |
2071 | if (err) |
2072 | goto cleanup_debugfs; | |
2073 | ||
2074 | return 0; | |
68905a14 | 2075 | |
68905a14 DK |
2076 | cleanup_debugfs: |
2077 | debugfs_remove_recursive(visornic_debugfs_dir); | |
2078 | ||
2079 | return err; | |
2080 | } | |
2081 | ||
2082 | /** | |
2083 | * visornic_cleanup - driver exit routine | |
2084 | * | |
2085 | * Unregister driver from the bus and free up memory. | |
2086 | */ | |
2087 | static void visornic_cleanup(void) | |
2088 | { | |
3798ff31 TS |
2089 | visorbus_unregister_visor_driver(&visornic_driver); |
2090 | ||
68905a14 | 2091 | debugfs_remove_recursive(visornic_debugfs_dir); |
68905a14 DK |
2092 | } |
2093 | ||
2094 | module_init(visornic_init); | |
2095 | module_exit(visornic_cleanup); | |
2096 | ||
2097 | MODULE_AUTHOR("Unisys"); | |
2098 | MODULE_LICENSE("GPL"); | |
bff8c1a1 | 2099 | MODULE_DESCRIPTION("s-Par NIC driver for virtual network devices"); |