1 /*
2 * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
5 * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #include "ipoib.h"
37
38 #include <rdma/ib_cache.h>
39
40 #include <security/mac/mac_framework.h>
41
42 #include <linux/delay.h>
43 #include <linux/dma-mapping.h>
44
45 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
46 static int data_debug_level;
47
48 module_param(data_debug_level, int, 0644);
49 MODULE_PARM_DESC(data_debug_level,
50 "Enable data path debug tracing if > 0");
51 #endif
52
53 static DEFINE_MUTEX(pkey_mutex);
54
ipoib_create_ah(struct ipoib_dev_priv * priv,struct ib_pd * pd,struct ib_ah_attr * attr)55 struct ipoib_ah *ipoib_create_ah(struct ipoib_dev_priv *priv,
56 struct ib_pd *pd, struct ib_ah_attr *attr)
57 {
58 struct ipoib_ah *ah;
59
60 ah = kmalloc(sizeof *ah, GFP_KERNEL);
61 if (!ah)
62 return NULL;
63
64 ah->priv = priv;
65 ah->last_send = 0;
66 kref_init(&ah->ref);
67
68 ah->ah = ib_create_ah(pd, attr);
69 if (IS_ERR(ah->ah)) {
70 kfree(ah);
71 ah = NULL;
72 } else
73 ipoib_dbg(priv, "Created ah %p\n", ah->ah);
74
75 return ah;
76 }
77
ipoib_free_ah(struct kref * kref)78 void ipoib_free_ah(struct kref *kref)
79 {
80 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
81 struct ipoib_dev_priv *priv = ah->priv;
82
83 unsigned long flags;
84
85 spin_lock_irqsave(&priv->lock, flags);
86 list_add_tail(&ah->list, &priv->dead_ahs);
87 spin_unlock_irqrestore(&priv->lock, flags);
88 }
89
90 void
ipoib_dma_unmap_rx(struct ipoib_dev_priv * priv,struct ipoib_rx_buf * rx_req)91 ipoib_dma_unmap_rx(struct ipoib_dev_priv *priv, struct ipoib_rx_buf *rx_req)
92 {
93 struct mbuf *m;
94 int i;
95
96 for (i = 0, m = rx_req->mb; m != NULL; m = m->m_next, i++)
97 ib_dma_unmap_single(priv->ca, rx_req->mapping[i], m->m_len,
98 DMA_FROM_DEVICE);
99 }
100
101 void
ipoib_dma_mb(struct ipoib_dev_priv * priv,struct mbuf * mb,unsigned int length)102 ipoib_dma_mb(struct ipoib_dev_priv *priv, struct mbuf *mb, unsigned int length)
103 {
104
105 m_adj(mb, -(mb->m_pkthdr.len - length));
106 }
107
108 struct mbuf *
ipoib_alloc_map_mb(struct ipoib_dev_priv * priv,struct ipoib_rx_buf * rx_req,int size)109 ipoib_alloc_map_mb(struct ipoib_dev_priv *priv, struct ipoib_rx_buf *rx_req,
110 int size)
111 {
112 struct mbuf *mb, *m;
113 int i, j;
114
115 rx_req->mb = NULL;
116 mb = m_getm2(NULL, size, M_NOWAIT, MT_DATA, M_PKTHDR);
117 if (mb == NULL)
118 return (NULL);
119 for (i = 0, m = mb; m != NULL; m = m->m_next, i++) {
120 m->m_len = M_SIZE(m);
121 mb->m_pkthdr.len += m->m_len;
122 rx_req->mapping[i] = ib_dma_map_single(priv->ca,
123 mtod(m, void *), m->m_len, DMA_FROM_DEVICE);
124 if (unlikely(ib_dma_mapping_error(priv->ca,
125 rx_req->mapping[i])))
126 goto error;
127
128 }
129 rx_req->mb = mb;
130 return (mb);
131 error:
132 for (j = 0, m = mb; j < i; m = m->m_next, j++)
133 ib_dma_unmap_single(priv->ca, rx_req->mapping[j], m->m_len,
134 DMA_FROM_DEVICE);
135 m_freem(mb);
136 return (NULL);
137
138 }
139
ipoib_ib_post_receive(struct ipoib_dev_priv * priv,int id)140 static int ipoib_ib_post_receive(struct ipoib_dev_priv *priv, int id)
141 {
142 struct ipoib_rx_buf *rx_req;
143 struct ib_recv_wr *bad_wr;
144 struct mbuf *m;
145 int ret;
146 int i;
147
148 rx_req = &priv->rx_ring[id];
149 for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) {
150 priv->rx_sge[i].addr = rx_req->mapping[i];
151 priv->rx_sge[i].length = m->m_len;
152 }
153 priv->rx_wr.num_sge = i;
154 priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
155
156 ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
157 if (unlikely(ret)) {
158 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
159 ipoib_dma_unmap_rx(priv, &priv->rx_ring[id]);
160 m_freem(priv->rx_ring[id].mb);
161 priv->rx_ring[id].mb = NULL;
162 }
163
164 return ret;
165 }
166
167 static struct mbuf *
ipoib_alloc_rx_mb(struct ipoib_dev_priv * priv,int id)168 ipoib_alloc_rx_mb(struct ipoib_dev_priv *priv, int id)
169 {
170
171 return ipoib_alloc_map_mb(priv, &priv->rx_ring[id],
172 priv->max_ib_mtu + IB_GRH_BYTES);
173 }
174
ipoib_ib_post_receives(struct ipoib_dev_priv * priv)175 static int ipoib_ib_post_receives(struct ipoib_dev_priv *priv)
176 {
177 int i;
178
179 for (i = 0; i < ipoib_recvq_size; ++i) {
180 if (!ipoib_alloc_rx_mb(priv, i)) {
181 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
182 return -ENOMEM;
183 }
184 if (ipoib_ib_post_receive(priv, i)) {
185 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
186 return -EIO;
187 }
188 }
189
190 return 0;
191 }
192
193 static void
ipoib_ib_handle_rx_wc(struct ipoib_dev_priv * priv,struct ib_wc * wc)194 ipoib_ib_handle_rx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
195 {
196 struct ipoib_rx_buf saverx;
197 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
198 struct ifnet *dev = priv->dev;
199 struct ipoib_header *eh;
200 struct mbuf *mb;
201
202 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
203 wr_id, wc->status);
204
205 if (unlikely(wr_id >= ipoib_recvq_size)) {
206 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
207 wr_id, ipoib_recvq_size);
208 return;
209 }
210
211 mb = priv->rx_ring[wr_id].mb;
212
213 if (unlikely(wc->status != IB_WC_SUCCESS)) {
214 if (wc->status != IB_WC_WR_FLUSH_ERR) {
215 ipoib_warn(priv, "failed recv event "
216 "(status=%d, wrid=%d vend_err %x)\n",
217 wc->status, wr_id, wc->vendor_err);
218 goto repost;
219 }
220 if (mb) {
221 ipoib_dma_unmap_rx(priv, &priv->rx_ring[wr_id]);
222 m_freem(mb);
223 priv->rx_ring[wr_id].mb = NULL;
224 }
225 return;
226 }
227
228 /*
229 * Drop packets that this interface sent, ie multicast packets
230 * that the HCA has replicated.
231 */
232 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
233 goto repost;
234
235 memcpy(&saverx, &priv->rx_ring[wr_id], sizeof(saverx));
236 /*
237 * If we can't allocate a new RX buffer, dump
238 * this packet and reuse the old buffer.
239 */
240 if (unlikely(!ipoib_alloc_rx_mb(priv, wr_id))) {
241 memcpy(&priv->rx_ring[wr_id], &saverx, sizeof(saverx));
242 if_inc_counter(dev, IFCOUNTER_IQDROPS, 1);
243 goto repost;
244 }
245
246 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
247 wc->byte_len, wc->slid);
248
249 ipoib_dma_unmap_rx(priv, &saverx);
250 ipoib_dma_mb(priv, mb, wc->byte_len);
251
252 if_inc_counter(dev, IFCOUNTER_IPACKETS, 1);
253 if_inc_counter(dev, IFCOUNTER_IBYTES, mb->m_pkthdr.len);
254 mb->m_pkthdr.rcvif = dev;
255 m_adj(mb, sizeof(struct ib_grh) - INFINIBAND_ALEN);
256 eh = mtod(mb, struct ipoib_header *);
257 bzero(eh->hwaddr, 4); /* Zero the queue pair, only dgid is in grh */
258
259 if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok))
260 mb->m_pkthdr.csum_flags = CSUM_IP_CHECKED | CSUM_IP_VALID;
261
262 dev->if_input(dev, mb);
263
264 repost:
265 if (unlikely(ipoib_ib_post_receive(priv, wr_id)))
266 ipoib_warn(priv, "ipoib_ib_post_receive failed "
267 "for buf %d\n", wr_id);
268 }
269
ipoib_dma_map_tx(struct ib_device * ca,struct ipoib_tx_buf * tx_req,int max)270 int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req, int max)
271 {
272 struct mbuf *mb = tx_req->mb;
273 u64 *mapping = tx_req->mapping;
274 struct mbuf *m, *p;
275 int error;
276 int i;
277
278 for (m = mb, p = NULL, i = 0; m != NULL; p = m, m = m->m_next, i++) {
279 if (m->m_len != 0)
280 continue;
281 if (p == NULL)
282 panic("ipoib_dma_map_tx: First mbuf empty\n");
283 p->m_next = m_free(m);
284 m = p;
285 i--;
286 }
287 i--;
288 if (i >= max) {
289 tx_req->mb = mb = m_defrag(mb, M_NOWAIT);
290 if (mb == NULL)
291 return -EIO;
292 for (m = mb, i = 0; m != NULL; m = m->m_next, i++);
293 if (i >= max)
294 return -EIO;
295 }
296 error = 0;
297 for (m = mb, i = 0; m != NULL; m = m->m_next, i++) {
298 mapping[i] = ib_dma_map_single(ca, mtod(m, void *),
299 m->m_len, DMA_TO_DEVICE);
300 if (unlikely(ib_dma_mapping_error(ca, mapping[i]))) {
301 error = -EIO;
302 break;
303 }
304 }
305 if (error) {
306 int end;
307
308 end = i;
309 for (m = mb, i = 0; i < end; m = m->m_next, i++)
310 ib_dma_unmap_single(ca, mapping[i], m->m_len,
311 DMA_TO_DEVICE);
312 }
313 return error;
314 }
315
ipoib_dma_unmap_tx(struct ib_device * ca,struct ipoib_tx_buf * tx_req)316 void ipoib_dma_unmap_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req)
317 {
318 struct mbuf *mb = tx_req->mb;
319 u64 *mapping = tx_req->mapping;
320 struct mbuf *m;
321 int i;
322
323 for (m = mb, i = 0; m != NULL; m = m->m_next, i++)
324 ib_dma_unmap_single(ca, mapping[i], m->m_len, DMA_TO_DEVICE);
325 }
326
ipoib_ib_handle_tx_wc(struct ipoib_dev_priv * priv,struct ib_wc * wc)327 static void ipoib_ib_handle_tx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
328 {
329 struct ifnet *dev = priv->dev;
330 unsigned int wr_id = wc->wr_id;
331 struct ipoib_tx_buf *tx_req;
332
333 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
334 wr_id, wc->status);
335
336 if (unlikely(wr_id >= ipoib_sendq_size)) {
337 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
338 wr_id, ipoib_sendq_size);
339 return;
340 }
341
342 tx_req = &priv->tx_ring[wr_id];
343
344 ipoib_dma_unmap_tx(priv->ca, tx_req);
345
346 if_inc_counter(dev, IFCOUNTER_OPACKETS, 1);
347
348 m_freem(tx_req->mb);
349
350 ++priv->tx_tail;
351 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
352 (dev->if_drv_flags & IFF_DRV_OACTIVE) &&
353 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
354 dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
355
356 if (wc->status != IB_WC_SUCCESS &&
357 wc->status != IB_WC_WR_FLUSH_ERR)
358 ipoib_warn(priv, "failed send event "
359 "(status=%d, wrid=%d vend_err %x)\n",
360 wc->status, wr_id, wc->vendor_err);
361 }
362
363 int
ipoib_poll_tx(struct ipoib_dev_priv * priv)364 ipoib_poll_tx(struct ipoib_dev_priv *priv)
365 {
366 int n, i;
367
368 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
369 for (i = 0; i < n; ++i) {
370 struct ib_wc *wc = priv->send_wc + i;
371 if (wc->wr_id & IPOIB_OP_CM)
372 ipoib_cm_handle_tx_wc(priv, wc);
373 else
374 ipoib_ib_handle_tx_wc(priv, wc);
375 }
376
377 return n == MAX_SEND_CQE;
378 }
379
380 static void
ipoib_poll(struct ipoib_dev_priv * priv)381 ipoib_poll(struct ipoib_dev_priv *priv)
382 {
383 int n, i;
384
385 poll_more:
386 spin_lock(&priv->drain_lock);
387 for (;;) {
388 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
389
390 for (i = 0; i < n; i++) {
391 struct ib_wc *wc = priv->ibwc + i;
392
393 if ((wc->wr_id & IPOIB_OP_RECV) == 0)
394 panic("ipoib_poll: Bad wr_id 0x%jX\n",
395 (intmax_t)wc->wr_id);
396 if (wc->wr_id & IPOIB_OP_CM)
397 ipoib_cm_handle_rx_wc(priv, wc);
398 else
399 ipoib_ib_handle_rx_wc(priv, wc);
400 }
401
402 if (n != IPOIB_NUM_WC)
403 break;
404 }
405 spin_unlock(&priv->drain_lock);
406
407 if (ib_req_notify_cq(priv->recv_cq,
408 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS))
409 goto poll_more;
410 }
411
ipoib_ib_completion(struct ib_cq * cq,void * dev_ptr)412 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
413 {
414 struct ipoib_dev_priv *priv = dev_ptr;
415
416 ipoib_poll(priv);
417 }
418
drain_tx_cq(struct ipoib_dev_priv * priv)419 static void drain_tx_cq(struct ipoib_dev_priv *priv)
420 {
421 struct ifnet *dev = priv->dev;
422
423 spin_lock(&priv->lock);
424 while (ipoib_poll_tx(priv))
425 ; /* nothing */
426
427 if (dev->if_drv_flags & IFF_DRV_OACTIVE)
428 mod_timer(&priv->poll_timer, jiffies + 1);
429
430 spin_unlock(&priv->lock);
431 }
432
ipoib_send_comp_handler(struct ib_cq * cq,void * dev_ptr)433 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
434 {
435 struct ipoib_dev_priv *priv = dev_ptr;
436
437 mod_timer(&priv->poll_timer, jiffies);
438 }
439
440 static inline int
post_send(struct ipoib_dev_priv * priv,unsigned int wr_id,struct ib_ah * address,u32 qpn,struct ipoib_tx_buf * tx_req,void * head,int hlen)441 post_send(struct ipoib_dev_priv *priv, unsigned int wr_id,
442 struct ib_ah *address, u32 qpn, struct ipoib_tx_buf *tx_req, void *head,
443 int hlen)
444 {
445 struct ib_send_wr *bad_wr;
446 struct mbuf *mb = tx_req->mb;
447 u64 *mapping = tx_req->mapping;
448 struct mbuf *m;
449 int i;
450
451 for (m = mb, i = 0; m != NULL; m = m->m_next, i++) {
452 priv->tx_sge[i].addr = mapping[i];
453 priv->tx_sge[i].length = m->m_len;
454 }
455 priv->tx_wr.num_sge = i;
456 priv->tx_wr.wr_id = wr_id;
457 priv->tx_wr.wr.ud.remote_qpn = qpn;
458 priv->tx_wr.wr.ud.ah = address;
459
460
461 if (head) {
462 priv->tx_wr.wr.ud.mss = 0; /* XXX mb_shinfo(mb)->gso_size; */
463 priv->tx_wr.wr.ud.header = head;
464 priv->tx_wr.wr.ud.hlen = hlen;
465 priv->tx_wr.opcode = IB_WR_LSO;
466 } else
467 priv->tx_wr.opcode = IB_WR_SEND;
468
469 return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
470 }
471
472 void
ipoib_send(struct ipoib_dev_priv * priv,struct mbuf * mb,struct ipoib_ah * address,u32 qpn)473 ipoib_send(struct ipoib_dev_priv *priv, struct mbuf *mb,
474 struct ipoib_ah *address, u32 qpn)
475 {
476 struct ifnet *dev = priv->dev;
477 struct ipoib_tx_buf *tx_req;
478 int hlen;
479 void *phead;
480
481 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
482 while (ipoib_poll_tx(priv))
483 ; /* nothing */
484
485 m_adj(mb, sizeof (struct ipoib_pseudoheader));
486 if (0 /* XXX segment offload mb_is_gso(mb) */) {
487 /* XXX hlen = mb_transport_offset(mb) + tcp_hdrlen(mb); */
488 phead = mtod(mb, void *);
489 if (mb->m_len < hlen) {
490 ipoib_warn(priv, "linear data too small\n");
491 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
492 m_freem(mb);
493 return;
494 }
495 m_adj(mb, hlen);
496 } else {
497 if (unlikely(mb->m_pkthdr.len - IPOIB_ENCAP_LEN > priv->mcast_mtu)) {
498 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
499 mb->m_pkthdr.len, priv->mcast_mtu);
500 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
501 ipoib_cm_mb_too_long(priv, mb, priv->mcast_mtu);
502 return;
503 }
504 phead = NULL;
505 hlen = 0;
506 }
507
508 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
509 mb->m_pkthdr.len, address, qpn);
510
511 /*
512 * We put the mb into the tx_ring _before_ we call post_send()
513 * because it's entirely possible that the completion handler will
514 * run before we execute anything after the post_send(). That
515 * means we have to make sure everything is properly recorded and
516 * our state is consistent before we call post_send().
517 */
518 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
519 tx_req->mb = mb;
520 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req, IPOIB_UD_TX_SG))) {
521 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
522 if (tx_req->mb)
523 m_freem(tx_req->mb);
524 return;
525 }
526
527 if (mb->m_pkthdr.csum_flags & (CSUM_IP|CSUM_TCP|CSUM_UDP))
528 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
529 else
530 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
531
532 if (++priv->tx_outstanding == ipoib_sendq_size) {
533 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
534 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
535 ipoib_warn(priv, "request notify on send CQ failed\n");
536 dev->if_drv_flags |= IFF_DRV_OACTIVE;
537 }
538
539 if (unlikely(post_send(priv,
540 priv->tx_head & (ipoib_sendq_size - 1), address->ah, qpn,
541 tx_req, phead, hlen))) {
542 ipoib_warn(priv, "post_send failed\n");
543 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
544 --priv->tx_outstanding;
545 ipoib_dma_unmap_tx(priv->ca, tx_req);
546 m_freem(mb);
547 if (dev->if_drv_flags & IFF_DRV_OACTIVE)
548 dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
549 } else {
550 address->last_send = priv->tx_head;
551 ++priv->tx_head;
552 }
553 }
554
__ipoib_reap_ah(struct ipoib_dev_priv * priv)555 static void __ipoib_reap_ah(struct ipoib_dev_priv *priv)
556 {
557 struct ipoib_ah *ah, *tah;
558 LIST_HEAD(remove_list);
559 unsigned long flags;
560
561 spin_lock_irqsave(&priv->lock, flags);
562
563 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
564 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
565 list_del(&ah->list);
566 ib_destroy_ah(ah->ah);
567 kfree(ah);
568 }
569
570 spin_unlock_irqrestore(&priv->lock, flags);
571 }
572
ipoib_reap_ah(struct work_struct * work)573 void ipoib_reap_ah(struct work_struct *work)
574 {
575 struct ipoib_dev_priv *priv =
576 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
577
578 __ipoib_reap_ah(priv);
579
580 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
581 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
582 HZ);
583 }
584
ipoib_ah_dev_cleanup(struct ipoib_dev_priv * priv)585 static void ipoib_ah_dev_cleanup(struct ipoib_dev_priv *priv)
586 {
587 unsigned long begin;
588
589 begin = jiffies;
590
591 while (!list_empty(&priv->dead_ahs)) {
592 __ipoib_reap_ah(priv);
593
594 if (time_after(jiffies, begin + HZ)) {
595 ipoib_warn(priv, "timing out; will leak address handles\n");
596 break;
597 }
598
599 msleep(1);
600 }
601 }
602
ipoib_ib_tx_timer_func(unsigned long ctx)603 static void ipoib_ib_tx_timer_func(unsigned long ctx)
604 {
605 drain_tx_cq((struct ipoib_dev_priv *)ctx);
606 }
607
ipoib_ib_dev_open(struct ipoib_dev_priv * priv)608 int ipoib_ib_dev_open(struct ipoib_dev_priv *priv)
609 {
610 int ret;
611
612 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
613 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
614 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
615 return -1;
616 }
617 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
618
619 ret = ipoib_init_qp(priv);
620 if (ret) {
621 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
622 return -1;
623 }
624
625 ret = ipoib_ib_post_receives(priv);
626 if (ret) {
627 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
628 ipoib_ib_dev_stop(priv, 1);
629 return -1;
630 }
631
632 ret = ipoib_cm_dev_open(priv);
633 if (ret) {
634 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
635 ipoib_ib_dev_stop(priv, 1);
636 return -1;
637 }
638
639 clear_bit(IPOIB_STOP_REAPER, &priv->flags);
640 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
641
642 return 0;
643 }
644
ipoib_pkey_dev_check_presence(struct ipoib_dev_priv * priv)645 static void ipoib_pkey_dev_check_presence(struct ipoib_dev_priv *priv)
646 {
647 u16 pkey_index = 0;
648
649 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
650 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
651 else
652 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
653 }
654
ipoib_ib_dev_up(struct ipoib_dev_priv * priv)655 int ipoib_ib_dev_up(struct ipoib_dev_priv *priv)
656 {
657
658 ipoib_pkey_dev_check_presence(priv);
659
660 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
661 ipoib_dbg(priv, "PKEY is not assigned.\n");
662 return 0;
663 }
664
665 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
666
667 return ipoib_mcast_start_thread(priv);
668 }
669
ipoib_ib_dev_down(struct ipoib_dev_priv * priv,int flush)670 int ipoib_ib_dev_down(struct ipoib_dev_priv *priv, int flush)
671 {
672
673 ipoib_dbg(priv, "downing ib_dev\n");
674
675 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
676 if_link_state_change(priv->dev, LINK_STATE_DOWN);
677
678 /* Shutdown the P_Key thread if still active */
679 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
680 mutex_lock(&pkey_mutex);
681 set_bit(IPOIB_PKEY_STOP, &priv->flags);
682 cancel_delayed_work(&priv->pkey_poll_task);
683 mutex_unlock(&pkey_mutex);
684 if (flush)
685 flush_workqueue(ipoib_workqueue);
686 }
687
688 ipoib_mcast_stop_thread(priv, flush);
689 ipoib_mcast_dev_flush(priv);
690
691 ipoib_flush_paths(priv);
692
693 return 0;
694 }
695
recvs_pending(struct ipoib_dev_priv * priv)696 static int recvs_pending(struct ipoib_dev_priv *priv)
697 {
698 int pending = 0;
699 int i;
700
701 for (i = 0; i < ipoib_recvq_size; ++i)
702 if (priv->rx_ring[i].mb)
703 ++pending;
704
705 return pending;
706 }
707
ipoib_drain_cq(struct ipoib_dev_priv * priv)708 void ipoib_drain_cq(struct ipoib_dev_priv *priv)
709 {
710 int i, n;
711
712 spin_lock(&priv->drain_lock);
713 do {
714 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
715 for (i = 0; i < n; ++i) {
716 /*
717 * Convert any successful completions to flush
718 * errors to avoid passing packets up the
719 * stack after bringing the device down.
720 */
721 if (priv->ibwc[i].status == IB_WC_SUCCESS)
722 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
723
724 if ((priv->ibwc[i].wr_id & IPOIB_OP_RECV) == 0)
725 panic("ipoib_drain_cq: Bad wrid 0x%jX\n",
726 (intmax_t)priv->ibwc[i].wr_id);
727 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
728 ipoib_cm_handle_rx_wc(priv, priv->ibwc + i);
729 else
730 ipoib_ib_handle_rx_wc(priv, priv->ibwc + i);
731 }
732 } while (n == IPOIB_NUM_WC);
733 spin_unlock(&priv->drain_lock);
734
735 spin_lock(&priv->lock);
736 while (ipoib_poll_tx(priv))
737 ; /* nothing */
738
739 spin_unlock(&priv->lock);
740 }
741
ipoib_ib_dev_stop(struct ipoib_dev_priv * priv,int flush)742 int ipoib_ib_dev_stop(struct ipoib_dev_priv *priv, int flush)
743 {
744 struct ib_qp_attr qp_attr;
745 unsigned long begin;
746 struct ipoib_tx_buf *tx_req;
747 int i;
748
749 ipoib_cm_dev_stop(priv);
750
751 /*
752 * Move our QP to the error state and then reinitialize in
753 * when all work requests have completed or have been flushed.
754 */
755 qp_attr.qp_state = IB_QPS_ERR;
756 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
757 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
758
759 /* Wait for all sends and receives to complete */
760 begin = jiffies;
761
762 while (priv->tx_head != priv->tx_tail || recvs_pending(priv)) {
763 if (time_after(jiffies, begin + 5 * HZ)) {
764 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
765 priv->tx_head - priv->tx_tail, recvs_pending(priv));
766
767 /*
768 * assume the HW is wedged and just free up
769 * all our pending work requests.
770 */
771 while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
772 tx_req = &priv->tx_ring[priv->tx_tail &
773 (ipoib_sendq_size - 1)];
774 ipoib_dma_unmap_tx(priv->ca, tx_req);
775 m_freem(tx_req->mb);
776 ++priv->tx_tail;
777 --priv->tx_outstanding;
778 }
779
780 for (i = 0; i < ipoib_recvq_size; ++i) {
781 struct ipoib_rx_buf *rx_req;
782
783 rx_req = &priv->rx_ring[i];
784 if (!rx_req->mb)
785 continue;
786 ipoib_dma_unmap_rx(priv, &priv->rx_ring[i]);
787 m_freem(rx_req->mb);
788 rx_req->mb = NULL;
789 }
790
791 goto timeout;
792 }
793
794 ipoib_drain_cq(priv);
795
796 msleep(1);
797 }
798
799 ipoib_dbg(priv, "All sends and receives done.\n");
800
801 timeout:
802 del_timer_sync(&priv->poll_timer);
803 qp_attr.qp_state = IB_QPS_RESET;
804 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
805 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
806
807 /* Wait for all AHs to be reaped */
808 set_bit(IPOIB_STOP_REAPER, &priv->flags);
809 cancel_delayed_work(&priv->ah_reap_task);
810 if (flush)
811 flush_workqueue(ipoib_workqueue);
812
813 ipoib_ah_dev_cleanup(priv);
814
815 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
816
817 return 0;
818 }
819
ipoib_ib_dev_init(struct ipoib_dev_priv * priv,struct ib_device * ca,int port)820 int ipoib_ib_dev_init(struct ipoib_dev_priv *priv, struct ib_device *ca, int port)
821 {
822 struct ifnet *dev = priv->dev;
823
824 priv->ca = ca;
825 priv->port = port;
826 priv->qp = NULL;
827
828 if (ipoib_transport_dev_init(priv, ca)) {
829 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
830 return -ENODEV;
831 }
832
833 setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
834 (unsigned long) priv);
835
836 if (dev->if_flags & IFF_UP) {
837 if (ipoib_ib_dev_open(priv)) {
838 ipoib_transport_dev_cleanup(priv);
839 return -ENODEV;
840 }
841 }
842
843 return 0;
844 }
845
__ipoib_ib_dev_flush(struct ipoib_dev_priv * priv,enum ipoib_flush_level level)846 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
847 enum ipoib_flush_level level)
848 {
849 struct ipoib_dev_priv *cpriv;
850 u16 new_index;
851
852 mutex_lock(&priv->vlan_mutex);
853
854 /*
855 * Flush any child interfaces too -- they might be up even if
856 * the parent is down.
857 */
858 list_for_each_entry(cpriv, &priv->child_intfs, list)
859 __ipoib_ib_dev_flush(cpriv, level);
860
861 mutex_unlock(&priv->vlan_mutex);
862
863 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
864 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
865 return;
866 }
867
868 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
869 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
870 return;
871 }
872
873 if (level == IPOIB_FLUSH_HEAVY) {
874 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
875 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
876 ipoib_ib_dev_down(priv, 0);
877 ipoib_ib_dev_stop(priv, 0);
878 if (ipoib_pkey_dev_delay_open(priv))
879 return;
880 }
881
882 /* restart QP only if P_Key index is changed */
883 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
884 new_index == priv->pkey_index) {
885 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
886 return;
887 }
888 priv->pkey_index = new_index;
889 }
890
891 if (level == IPOIB_FLUSH_LIGHT) {
892 ipoib_mark_paths_invalid(priv);
893 ipoib_mcast_dev_flush(priv);
894 }
895
896 if (level >= IPOIB_FLUSH_NORMAL)
897 ipoib_ib_dev_down(priv, 0);
898
899 if (level == IPOIB_FLUSH_HEAVY) {
900 ipoib_ib_dev_stop(priv, 0);
901 ipoib_ib_dev_open(priv);
902 }
903
904 /*
905 * The device could have been brought down between the start and when
906 * we get here, don't bring it back up if it's not configured up
907 */
908 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
909 if (level >= IPOIB_FLUSH_NORMAL)
910 ipoib_ib_dev_up(priv);
911 ipoib_mcast_restart_task(&priv->restart_task);
912 }
913 }
914
ipoib_ib_dev_flush_light(struct work_struct * work)915 void ipoib_ib_dev_flush_light(struct work_struct *work)
916 {
917 struct ipoib_dev_priv *priv =
918 container_of(work, struct ipoib_dev_priv, flush_light);
919
920 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
921 }
922
ipoib_ib_dev_flush_normal(struct work_struct * work)923 void ipoib_ib_dev_flush_normal(struct work_struct *work)
924 {
925 struct ipoib_dev_priv *priv =
926 container_of(work, struct ipoib_dev_priv, flush_normal);
927
928 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
929 }
930
ipoib_ib_dev_flush_heavy(struct work_struct * work)931 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
932 {
933 struct ipoib_dev_priv *priv =
934 container_of(work, struct ipoib_dev_priv, flush_heavy);
935
936 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
937 }
938
ipoib_ib_dev_cleanup(struct ipoib_dev_priv * priv)939 void ipoib_ib_dev_cleanup(struct ipoib_dev_priv *priv)
940 {
941
942 ipoib_dbg(priv, "cleaning up ib_dev\n");
943
944 ipoib_mcast_stop_thread(priv, 1);
945 ipoib_mcast_dev_flush(priv);
946
947 ipoib_ah_dev_cleanup(priv);
948 ipoib_transport_dev_cleanup(priv);
949 }
950
951 /*
952 * Delayed P_Key Assigment Interim Support
953 *
954 * The following is initial implementation of delayed P_Key assigment
955 * mechanism. It is using the same approach implemented for the multicast
956 * group join. The single goal of this implementation is to quickly address
957 * Bug #2507. This implementation will probably be removed when the P_Key
958 * change async notification is available.
959 */
960
ipoib_pkey_poll(struct work_struct * work)961 void ipoib_pkey_poll(struct work_struct *work)
962 {
963 struct ipoib_dev_priv *priv =
964 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
965
966 ipoib_pkey_dev_check_presence(priv);
967
968 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
969 ipoib_open(priv);
970 else {
971 mutex_lock(&pkey_mutex);
972 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
973 queue_delayed_work(ipoib_workqueue,
974 &priv->pkey_poll_task,
975 HZ);
976 mutex_unlock(&pkey_mutex);
977 }
978 }
979
ipoib_pkey_dev_delay_open(struct ipoib_dev_priv * priv)980 int ipoib_pkey_dev_delay_open(struct ipoib_dev_priv *priv)
981 {
982
983 /* Look for the interface pkey value in the IB Port P_Key table and */
984 /* set the interface pkey assigment flag */
985 ipoib_pkey_dev_check_presence(priv);
986
987 /* P_Key value not assigned yet - start polling */
988 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
989 mutex_lock(&pkey_mutex);
990 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
991 queue_delayed_work(ipoib_workqueue,
992 &priv->pkey_poll_task,
993 HZ);
994 mutex_unlock(&pkey_mutex);
995 return 1;
996 }
997
998 return 0;
999 }
1000