1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
3 *
4 * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.
5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
6 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
7 * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
8 *
9 * This software is available to you under a choice of one of two
10 * licenses. You may choose to be licensed under the terms of the GNU
11 * General Public License (GPL) Version 2, available from the file
12 * COPYING in the main directory of this source tree, or the
13 * OpenIB.org BSD license below:
14 *
15 * Redistribution and use in source and binary forms, with or
16 * without modification, are permitted provided that the following
17 * conditions are met:
18 *
19 * - Redistributions of source code must retain the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer.
22 *
23 * - Redistributions in binary form must reproduce the above
24 * copyright notice, this list of conditions and the following
25 * disclaimer in the documentation and/or other materials
26 * provided with the distribution.
27 *
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
29 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
31 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
32 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
33 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
34 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 * SOFTWARE.
36 */
37
38 #include <sys/cdefs.h>
39 #include "ipoib.h"
40
41 #include <rdma/ib_cache.h>
42
43 #include <security/mac/mac_framework.h>
44
45 #include <linux/delay.h>
46 #include <linux/dma-mapping.h>
47
48 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
49 static int data_debug_level;
50
51 module_param(data_debug_level, int, 0644);
52 MODULE_PARM_DESC(data_debug_level,
53 "Enable data path debug tracing if > 0");
54 #endif
55
56 static DEFINE_MUTEX(pkey_mutex);
57
ipoib_create_ah(struct ipoib_dev_priv * priv,struct ib_pd * pd,struct ib_ah_attr * attr)58 struct ipoib_ah *ipoib_create_ah(struct ipoib_dev_priv *priv,
59 struct ib_pd *pd, struct ib_ah_attr *attr)
60 {
61 struct ipoib_ah *ah;
62
63 ah = kmalloc(sizeof *ah, GFP_KERNEL);
64 if (!ah)
65 return NULL;
66
67 ah->priv = priv;
68 ah->last_send = 0;
69 kref_init(&ah->ref);
70
71 ah->ah = ib_create_ah(pd, attr, RDMA_CREATE_AH_SLEEPABLE);
72 if (IS_ERR(ah->ah)) {
73 kfree(ah);
74 ah = NULL;
75 } else
76 ipoib_dbg(priv, "Created ah %p\n", ah->ah);
77
78 return ah;
79 }
80
ipoib_free_ah(struct kref * kref)81 void ipoib_free_ah(struct kref *kref)
82 {
83 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
84 struct ipoib_dev_priv *priv = ah->priv;
85
86 unsigned long flags;
87
88 spin_lock_irqsave(&priv->lock, flags);
89 list_add_tail(&ah->list, &priv->dead_ahs);
90 spin_unlock_irqrestore(&priv->lock, flags);
91 }
92
93 void
ipoib_dma_unmap_rx(struct ipoib_dev_priv * priv,struct ipoib_rx_buf * rx_req)94 ipoib_dma_unmap_rx(struct ipoib_dev_priv *priv, struct ipoib_rx_buf *rx_req)
95 {
96 struct mbuf *m;
97 int i;
98
99 for (i = 0, m = rx_req->mb; m != NULL; m = m->m_next, i++)
100 ib_dma_unmap_single(priv->ca, rx_req->mapping[i], m->m_len,
101 DMA_FROM_DEVICE);
102 }
103
104 void
ipoib_dma_mb(struct ipoib_dev_priv * priv,struct mbuf * mb,unsigned int length)105 ipoib_dma_mb(struct ipoib_dev_priv *priv, struct mbuf *mb, unsigned int length)
106 {
107
108 m_adj(mb, -(mb->m_pkthdr.len - length));
109 }
110
111 struct mbuf *
ipoib_alloc_map_mb(struct ipoib_dev_priv * priv,struct ipoib_rx_buf * rx_req,int align,int size,int max_frags)112 ipoib_alloc_map_mb(struct ipoib_dev_priv *priv, struct ipoib_rx_buf *rx_req,
113 int align, int size, int max_frags)
114 {
115 struct mbuf *mb, *m;
116 int i, j;
117
118 rx_req->mb = NULL;
119 mb = m_getm2(NULL, align + size, M_NOWAIT, MT_DATA, M_PKTHDR);
120 if (mb == NULL)
121 return (NULL);
122 for (i = 0, m = mb; m != NULL; m = m->m_next, i++) {
123 MPASS(i < max_frags);
124
125 m->m_len = M_SIZE(m) - align;
126 m->m_data += align;
127 align = 0;
128 mb->m_pkthdr.len += m->m_len;
129 rx_req->mapping[i] = ib_dma_map_single(priv->ca,
130 mtod(m, void *), m->m_len, DMA_FROM_DEVICE);
131 if (unlikely(ib_dma_mapping_error(priv->ca,
132 rx_req->mapping[i])))
133 goto error;
134
135 }
136 rx_req->mb = mb;
137 return (mb);
138 error:
139 for (j = 0, m = mb; j < i; m = m->m_next, j++)
140 ib_dma_unmap_single(priv->ca, rx_req->mapping[j], m->m_len,
141 DMA_FROM_DEVICE);
142 m_freem(mb);
143 return (NULL);
144
145 }
146
ipoib_ib_post_receive(struct ipoib_dev_priv * priv,int id)147 static int ipoib_ib_post_receive(struct ipoib_dev_priv *priv, int id)
148 {
149 struct ipoib_rx_buf *rx_req;
150 const struct ib_recv_wr *bad_wr;
151 struct mbuf *m;
152 int ret;
153 int i;
154
155 rx_req = &priv->rx_ring[id];
156 for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) {
157 priv->rx_sge[i].addr = rx_req->mapping[i];
158 priv->rx_sge[i].length = m->m_len;
159 }
160 priv->rx_wr.num_sge = i;
161 priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
162
163 ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
164 if (unlikely(ret)) {
165 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
166 ipoib_dma_unmap_rx(priv, &priv->rx_ring[id]);
167 m_freem(priv->rx_ring[id].mb);
168 priv->rx_ring[id].mb = NULL;
169 }
170
171 return ret;
172 }
173
174 static struct mbuf *
ipoib_alloc_rx_mb(struct ipoib_dev_priv * priv,int id)175 ipoib_alloc_rx_mb(struct ipoib_dev_priv *priv, int id)
176 {
177 return ipoib_alloc_map_mb(priv, &priv->rx_ring[id],
178 0, priv->max_ib_mtu + IB_GRH_BYTES, IPOIB_UD_RX_SG);
179 }
180
ipoib_ib_post_receives(struct ipoib_dev_priv * priv)181 static int ipoib_ib_post_receives(struct ipoib_dev_priv *priv)
182 {
183 int i;
184
185 for (i = 0; i < ipoib_recvq_size; ++i) {
186 if (!ipoib_alloc_rx_mb(priv, i)) {
187 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
188 return -ENOMEM;
189 }
190 if (ipoib_ib_post_receive(priv, i)) {
191 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
192 return -EIO;
193 }
194 }
195
196 return 0;
197 }
198
199 static void
ipoib_ib_handle_rx_wc(struct ipoib_dev_priv * priv,struct ib_wc * wc)200 ipoib_ib_handle_rx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
201 {
202 struct ipoib_rx_buf saverx;
203 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
204 if_t dev = priv->dev;
205 struct ipoib_header *eh;
206 struct mbuf *mb;
207
208 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
209 wr_id, wc->status);
210
211 if (unlikely(wr_id >= ipoib_recvq_size)) {
212 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
213 wr_id, ipoib_recvq_size);
214 return;
215 }
216
217 mb = priv->rx_ring[wr_id].mb;
218
219 if (unlikely(wc->status != IB_WC_SUCCESS)) {
220 if (wc->status != IB_WC_WR_FLUSH_ERR) {
221 ipoib_warn(priv, "failed recv event "
222 "(status=%d, wrid=%d vend_err %x)\n",
223 wc->status, wr_id, wc->vendor_err);
224 goto repost;
225 }
226 if (mb) {
227 ipoib_dma_unmap_rx(priv, &priv->rx_ring[wr_id]);
228 m_freem(mb);
229 priv->rx_ring[wr_id].mb = NULL;
230 }
231 return;
232 }
233
234 /*
235 * Drop packets that this interface sent, ie multicast packets
236 * that the HCA has replicated.
237 */
238 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
239 goto repost;
240
241 memcpy(&saverx, &priv->rx_ring[wr_id], sizeof(saverx));
242 /*
243 * If we can't allocate a new RX buffer, dump
244 * this packet and reuse the old buffer.
245 */
246 if (unlikely(!ipoib_alloc_rx_mb(priv, wr_id))) {
247 memcpy(&priv->rx_ring[wr_id], &saverx, sizeof(saverx));
248 if_inc_counter(dev, IFCOUNTER_IQDROPS, 1);
249 goto repost;
250 }
251
252 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
253 wc->byte_len, wc->slid);
254
255 ipoib_dma_unmap_rx(priv, &saverx);
256 ipoib_dma_mb(priv, mb, wc->byte_len);
257
258 if_inc_counter(dev, IFCOUNTER_IPACKETS, 1);
259 if_inc_counter(dev, IFCOUNTER_IBYTES, mb->m_pkthdr.len);
260 mb->m_pkthdr.rcvif = dev;
261 m_adj(mb, sizeof(struct ib_grh) - INFINIBAND_ALEN);
262 eh = mtod(mb, struct ipoib_header *);
263 bzero(eh->hwaddr, 4); /* Zero the queue pair, only dgid is in grh */
264
265 if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
266 mb->m_pkthdr.csum_flags = CSUM_IP_CHECKED | CSUM_IP_VALID;
267
268 if_input(dev, mb);
269
270 repost:
271 if (unlikely(ipoib_ib_post_receive(priv, wr_id)))
272 ipoib_warn(priv, "ipoib_ib_post_receive failed "
273 "for buf %d\n", wr_id);
274 }
275
ipoib_dma_map_tx(struct ib_device * ca,struct ipoib_tx_buf * tx_req,int max)276 int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req, int max)
277 {
278 struct mbuf *mb = tx_req->mb;
279 u64 *mapping = tx_req->mapping;
280 struct mbuf *m, *p;
281 int error;
282 int i;
283
284 for (m = mb, p = NULL, i = 0; m != NULL; p = m, m = m->m_next, i++) {
285 if (m->m_len != 0)
286 continue;
287 if (p == NULL)
288 panic("ipoib_dma_map_tx: First mbuf empty\n");
289 p->m_next = m_free(m);
290 m = p;
291 i--;
292 }
293 i--;
294 if (i >= max) {
295 tx_req->mb = mb = m_defrag(mb, M_NOWAIT);
296 if (mb == NULL)
297 return -EIO;
298 for (m = mb, i = 0; m != NULL; m = m->m_next, i++);
299 if (i >= max)
300 return -EIO;
301 }
302 error = 0;
303 for (m = mb, i = 0; m != NULL; m = m->m_next, i++) {
304 mapping[i] = ib_dma_map_single(ca, mtod(m, void *),
305 m->m_len, DMA_TO_DEVICE);
306 if (unlikely(ib_dma_mapping_error(ca, mapping[i]))) {
307 error = -EIO;
308 break;
309 }
310 }
311 if (error) {
312 int end;
313
314 end = i;
315 for (m = mb, i = 0; i < end; m = m->m_next, i++)
316 ib_dma_unmap_single(ca, mapping[i], m->m_len,
317 DMA_TO_DEVICE);
318 }
319 return error;
320 }
321
ipoib_dma_unmap_tx(struct ib_device * ca,struct ipoib_tx_buf * tx_req)322 void ipoib_dma_unmap_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req)
323 {
324 struct mbuf *mb = tx_req->mb;
325 u64 *mapping = tx_req->mapping;
326 struct mbuf *m;
327 int i;
328
329 for (m = mb, i = 0; m != NULL; m = m->m_next, i++)
330 ib_dma_unmap_single(ca, mapping[i], m->m_len, DMA_TO_DEVICE);
331 }
332
ipoib_ib_handle_tx_wc(struct ipoib_dev_priv * priv,struct ib_wc * wc)333 static void ipoib_ib_handle_tx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
334 {
335 if_t dev = priv->dev;
336 unsigned int wr_id = wc->wr_id;
337 struct ipoib_tx_buf *tx_req;
338
339 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
340 wr_id, wc->status);
341
342 if (unlikely(wr_id >= ipoib_sendq_size)) {
343 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
344 wr_id, ipoib_sendq_size);
345 return;
346 }
347
348 tx_req = &priv->tx_ring[wr_id];
349
350 ipoib_dma_unmap_tx(priv->ca, tx_req);
351
352 if_inc_counter(dev, IFCOUNTER_OPACKETS, 1);
353
354 m_freem(tx_req->mb);
355
356 ++priv->tx_tail;
357 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
358 (if_getdrvflags(dev) & IFF_DRV_OACTIVE) &&
359 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
360 if_setdrvflagbits(dev, 0, IFF_DRV_OACTIVE);
361
362 if (wc->status != IB_WC_SUCCESS &&
363 wc->status != IB_WC_WR_FLUSH_ERR)
364 ipoib_warn(priv, "failed send event "
365 "(status=%d, wrid=%d vend_err %x)\n",
366 wc->status, wr_id, wc->vendor_err);
367 }
368
369 int
ipoib_poll_tx(struct ipoib_dev_priv * priv,bool do_start)370 ipoib_poll_tx(struct ipoib_dev_priv *priv, bool do_start)
371 {
372 int n, i;
373
374 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
375 for (i = 0; i < n; ++i) {
376 struct ib_wc *wc = priv->send_wc + i;
377 if (wc->wr_id & IPOIB_OP_CM)
378 ipoib_cm_handle_tx_wc(priv, wc);
379 else
380 ipoib_ib_handle_tx_wc(priv, wc);
381 }
382
383 if (do_start && n != 0)
384 ipoib_start_locked(priv->dev, priv);
385
386 return n == MAX_SEND_CQE;
387 }
388
389 static void
ipoib_poll(struct ipoib_dev_priv * priv)390 ipoib_poll(struct ipoib_dev_priv *priv)
391 {
392 int n, i;
393
394 poll_more:
395 spin_lock(&priv->drain_lock);
396 for (;;) {
397 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
398 for (i = 0; i < n; i++) {
399 struct ib_wc *wc = priv->ibwc + i;
400
401 if ((wc->wr_id & IPOIB_OP_RECV) == 0)
402 panic("ipoib_poll: Bad wr_id 0x%jX\n",
403 (intmax_t)wc->wr_id);
404 if (wc->wr_id & IPOIB_OP_CM)
405 ipoib_cm_handle_rx_wc(priv, wc);
406 else
407 ipoib_ib_handle_rx_wc(priv, wc);
408 }
409
410 if (n != IPOIB_NUM_WC)
411 break;
412 }
413 spin_unlock(&priv->drain_lock);
414
415 if (ib_req_notify_cq(priv->recv_cq,
416 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS) > 0)
417 goto poll_more;
418 }
419
ipoib_ib_completion(struct ib_cq * cq,void * dev_ptr)420 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
421 {
422 struct ipoib_dev_priv *priv = dev_ptr;
423
424 ipoib_poll(priv);
425 }
426
drain_tx_cq(struct ipoib_dev_priv * priv)427 static void drain_tx_cq(struct ipoib_dev_priv *priv)
428 {
429 if_t dev = priv->dev;
430
431 spin_lock(&priv->lock);
432 while (ipoib_poll_tx(priv, true))
433 ; /* nothing */
434
435 if (if_getdrvflags(dev) & IFF_DRV_OACTIVE)
436 mod_timer(&priv->poll_timer, jiffies + 1);
437
438 spin_unlock(&priv->lock);
439 }
440
ipoib_send_comp_handler(struct ib_cq * cq,void * dev_ptr)441 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
442 {
443 struct ipoib_dev_priv *priv = dev_ptr;
444
445 mod_timer(&priv->poll_timer, jiffies);
446 }
447
448 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)449 post_send(struct ipoib_dev_priv *priv, unsigned int wr_id,
450 struct ib_ah *address, u32 qpn, struct ipoib_tx_buf *tx_req, void *head,
451 int hlen)
452 {
453 const struct ib_send_wr *bad_wr;
454 struct mbuf *mb = tx_req->mb;
455 u64 *mapping = tx_req->mapping;
456 struct mbuf *m;
457 int i;
458
459 for (m = mb, i = 0; m != NULL; m = m->m_next, i++) {
460 priv->tx_sge[i].addr = mapping[i];
461 priv->tx_sge[i].length = m->m_len;
462 }
463 priv->tx_wr.wr.num_sge = i;
464 priv->tx_wr.wr.wr_id = wr_id;
465 priv->tx_wr.remote_qpn = qpn;
466 priv->tx_wr.ah = address;
467
468 if (head) {
469 priv->tx_wr.mss = 0; /* XXX mb_shinfo(mb)->gso_size; */
470 priv->tx_wr.header = head;
471 priv->tx_wr.hlen = hlen;
472 priv->tx_wr.wr.opcode = IB_WR_LSO;
473 } else
474 priv->tx_wr.wr.opcode = IB_WR_SEND;
475
476 return ib_post_send(priv->qp, &priv->tx_wr.wr, &bad_wr);
477 }
478
479 void
ipoib_send(struct ipoib_dev_priv * priv,struct mbuf * mb,struct ipoib_ah * address,u32 qpn)480 ipoib_send(struct ipoib_dev_priv *priv, struct mbuf *mb,
481 struct ipoib_ah *address, u32 qpn)
482 {
483 if_t dev = priv->dev;
484 struct ipoib_tx_buf *tx_req;
485 int hlen;
486 void *phead;
487
488 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
489 while (ipoib_poll_tx(priv, false))
490 ; /* nothing */
491
492 m_adj(mb, sizeof (struct ipoib_pseudoheader));
493 if (0 /* XXX segment offload mb_is_gso(mb) */) {
494 /* XXX hlen = mb_transport_offset(mb) + tcp_hdrlen(mb); */
495 phead = mtod(mb, void *);
496 if (mb->m_len < hlen) {
497 ipoib_warn(priv, "linear data too small\n");
498 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
499 m_freem(mb);
500 return;
501 }
502 m_adj(mb, hlen);
503 } else {
504 if (unlikely(mb->m_pkthdr.len - IPOIB_ENCAP_LEN > priv->mcast_mtu)) {
505 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
506 mb->m_pkthdr.len, priv->mcast_mtu);
507 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
508 ipoib_cm_mb_too_long(priv, mb, priv->mcast_mtu);
509 return;
510 }
511 phead = NULL;
512 hlen = 0;
513 }
514
515 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
516 mb->m_pkthdr.len, address, qpn);
517
518 /*
519 * We put the mb into the tx_ring _before_ we call post_send()
520 * because it's entirely possible that the completion handler will
521 * run before we execute anything after the post_send(). That
522 * means we have to make sure everything is properly recorded and
523 * our state is consistent before we call post_send().
524 */
525 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
526 tx_req->mb = mb;
527 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req, IPOIB_UD_TX_SG))) {
528 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
529 if (tx_req->mb)
530 m_freem(tx_req->mb);
531 return;
532 }
533
534 if (mb->m_pkthdr.csum_flags & (CSUM_IP|CSUM_TCP|CSUM_UDP))
535 priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM;
536 else
537 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
538
539 if (++priv->tx_outstanding == ipoib_sendq_size) {
540 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
541 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
542 ipoib_warn(priv, "request notify on send CQ failed\n");
543 if_setdrvflagbits(dev, IFF_DRV_OACTIVE, 0);
544 }
545
546 if (unlikely(post_send(priv,
547 priv->tx_head & (ipoib_sendq_size - 1), address->ah, qpn,
548 tx_req, phead, hlen))) {
549 ipoib_warn(priv, "post_send failed\n");
550 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
551 --priv->tx_outstanding;
552 ipoib_dma_unmap_tx(priv->ca, tx_req);
553 m_freem(mb);
554 if (if_getdrvflags(dev) & IFF_DRV_OACTIVE)
555 if_setdrvflagbits(dev, 0, IFF_DRV_OACTIVE);
556 } else {
557 address->last_send = priv->tx_head;
558 ++priv->tx_head;
559 }
560 }
561
__ipoib_reap_ah(struct ipoib_dev_priv * priv)562 static void __ipoib_reap_ah(struct ipoib_dev_priv *priv)
563 {
564 struct ipoib_ah *ah, *tah;
565 LIST_HEAD(remove_list);
566 unsigned long flags;
567
568 spin_lock_irqsave(&priv->lock, flags);
569
570 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
571 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
572 list_del(&ah->list);
573 ib_destroy_ah(ah->ah, 0);
574 kfree(ah);
575 }
576
577 spin_unlock_irqrestore(&priv->lock, flags);
578 }
579
ipoib_reap_ah(struct work_struct * work)580 void ipoib_reap_ah(struct work_struct *work)
581 {
582 struct ipoib_dev_priv *priv =
583 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
584
585 __ipoib_reap_ah(priv);
586
587 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
588 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
589 HZ);
590 }
591
ipoib_ah_dev_cleanup(struct ipoib_dev_priv * priv)592 static void ipoib_ah_dev_cleanup(struct ipoib_dev_priv *priv)
593 {
594 unsigned long begin;
595
596 begin = jiffies;
597
598 while (!list_empty(&priv->dead_ahs)) {
599 __ipoib_reap_ah(priv);
600
601 if (time_after(jiffies, begin + HZ)) {
602 ipoib_warn(priv, "timing out; will leak address handles\n");
603 break;
604 }
605
606 msleep(1);
607 }
608 }
609
ipoib_ib_tx_timer_func(unsigned long ctx)610 static void ipoib_ib_tx_timer_func(unsigned long ctx)
611 {
612 drain_tx_cq((struct ipoib_dev_priv *)ctx);
613 }
614
ipoib_ib_dev_open(struct ipoib_dev_priv * priv)615 int ipoib_ib_dev_open(struct ipoib_dev_priv *priv)
616 {
617 int ret;
618
619 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
620 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
621 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
622 return -1;
623 }
624 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
625
626 ret = ipoib_init_qp(priv);
627 if (ret) {
628 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
629 return -1;
630 }
631
632 ret = ipoib_ib_post_receives(priv);
633 if (ret) {
634 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
635 ipoib_ib_dev_stop(priv, 1);
636 return -1;
637 }
638
639 ret = ipoib_cm_dev_open(priv);
640 if (ret) {
641 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
642 ipoib_ib_dev_stop(priv, 1);
643 return -1;
644 }
645
646 clear_bit(IPOIB_STOP_REAPER, &priv->flags);
647 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
648
649 set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
650
651 return 0;
652 }
653
ipoib_pkey_dev_check_presence(struct ipoib_dev_priv * priv)654 static void ipoib_pkey_dev_check_presence(struct ipoib_dev_priv *priv)
655 {
656 u16 pkey_index = 0;
657
658 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
659 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
660 else
661 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
662 }
663
ipoib_ib_dev_up(struct ipoib_dev_priv * priv)664 int ipoib_ib_dev_up(struct ipoib_dev_priv *priv)
665 {
666
667 ipoib_pkey_dev_check_presence(priv);
668
669 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
670 ipoib_dbg(priv, "PKEY is not assigned.\n");
671 return 0;
672 }
673
674 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
675
676 return ipoib_mcast_start_thread(priv);
677 }
678
ipoib_ib_dev_down(struct ipoib_dev_priv * priv,int flush)679 int ipoib_ib_dev_down(struct ipoib_dev_priv *priv, int flush)
680 {
681
682 ipoib_dbg(priv, "downing ib_dev\n");
683
684 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
685 if_link_state_change(priv->dev, LINK_STATE_DOWN);
686
687 /* Shutdown the P_Key thread if still active */
688 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
689 mutex_lock(&pkey_mutex);
690 set_bit(IPOIB_PKEY_STOP, &priv->flags);
691 cancel_delayed_work(&priv->pkey_poll_task);
692 mutex_unlock(&pkey_mutex);
693 if (flush)
694 flush_workqueue(ipoib_workqueue);
695 }
696
697 ipoib_mcast_stop_thread(priv, flush);
698 ipoib_mcast_dev_flush(priv);
699
700 ipoib_flush_paths(priv);
701
702 return 0;
703 }
704
recvs_pending(struct ipoib_dev_priv * priv)705 static int recvs_pending(struct ipoib_dev_priv *priv)
706 {
707 int pending = 0;
708 int i;
709
710 for (i = 0; i < ipoib_recvq_size; ++i)
711 if (priv->rx_ring[i].mb)
712 ++pending;
713
714 return pending;
715 }
716
check_qp_movement_and_print(struct ipoib_dev_priv * priv,struct ib_qp * qp,enum ib_qp_state new_state)717 static void check_qp_movement_and_print(struct ipoib_dev_priv *priv,
718 struct ib_qp *qp,
719 enum ib_qp_state new_state)
720 {
721 struct ib_qp_attr qp_attr;
722 struct ib_qp_init_attr query_init_attr;
723 int ret;
724
725 ret = ib_query_qp(qp, &qp_attr, IB_QP_STATE, &query_init_attr);
726 if (ret) {
727 ipoib_warn(priv, "%s: Failed to query QP (%d)\n", __func__, ret);
728 return;
729 }
730
731 /* print according to the new-state and the previous state */
732 if (new_state == IB_QPS_ERR && qp_attr.qp_state == IB_QPS_RESET) {
733 ipoib_dbg(priv, "Failed to modify QP %d->%d, acceptable\n",
734 qp_attr.qp_state, new_state);
735 } else {
736 ipoib_warn(priv, "Failed to modify QP %d->%d\n",
737 qp_attr.qp_state, new_state);
738 }
739 }
740
ipoib_drain_cq(struct ipoib_dev_priv * priv)741 void ipoib_drain_cq(struct ipoib_dev_priv *priv)
742 {
743 int i, n;
744
745 spin_lock(&priv->drain_lock);
746 do {
747 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
748 for (i = 0; i < n; ++i) {
749 /*
750 * Convert any successful completions to flush
751 * errors to avoid passing packets up the
752 * stack after bringing the device down.
753 */
754 if (priv->ibwc[i].status == IB_WC_SUCCESS)
755 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
756
757 if ((priv->ibwc[i].wr_id & IPOIB_OP_RECV) == 0)
758 panic("ipoib_drain_cq: Bad wrid 0x%jX\n",
759 (intmax_t)priv->ibwc[i].wr_id);
760 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
761 ipoib_cm_handle_rx_wc(priv, priv->ibwc + i);
762 else
763 ipoib_ib_handle_rx_wc(priv, priv->ibwc + i);
764 }
765 } while (n == IPOIB_NUM_WC);
766 spin_unlock(&priv->drain_lock);
767
768 spin_lock(&priv->lock);
769 while (ipoib_poll_tx(priv, true))
770 ; /* nothing */
771
772 spin_unlock(&priv->lock);
773 }
774
ipoib_ib_dev_stop(struct ipoib_dev_priv * priv,int flush)775 int ipoib_ib_dev_stop(struct ipoib_dev_priv *priv, int flush)
776 {
777 struct ib_qp_attr qp_attr;
778 unsigned long begin;
779 struct ipoib_tx_buf *tx_req;
780 int i;
781
782 clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
783
784 ipoib_cm_dev_stop(priv);
785
786 /*
787 * Move our QP to the error state and then reinitialize in
788 * when all work requests have completed or have been flushed.
789 */
790 qp_attr.qp_state = IB_QPS_ERR;
791 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
792 check_qp_movement_and_print(priv, priv->qp, IB_QPS_ERR);
793
794 /* Wait for all sends and receives to complete */
795 begin = jiffies;
796
797 while (priv->tx_head != priv->tx_tail || recvs_pending(priv)) {
798 if (time_after(jiffies, begin + 5 * HZ)) {
799 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
800 priv->tx_head - priv->tx_tail, recvs_pending(priv));
801
802 /*
803 * assume the HW is wedged and just free up
804 * all our pending work requests.
805 */
806 while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
807 tx_req = &priv->tx_ring[priv->tx_tail &
808 (ipoib_sendq_size - 1)];
809 ipoib_dma_unmap_tx(priv->ca, tx_req);
810 m_freem(tx_req->mb);
811 ++priv->tx_tail;
812 --priv->tx_outstanding;
813 }
814
815 for (i = 0; i < ipoib_recvq_size; ++i) {
816 struct ipoib_rx_buf *rx_req;
817
818 rx_req = &priv->rx_ring[i];
819 if (!rx_req->mb)
820 continue;
821 ipoib_dma_unmap_rx(priv, &priv->rx_ring[i]);
822 m_freem(rx_req->mb);
823 rx_req->mb = NULL;
824 }
825
826 goto timeout;
827 }
828
829 ipoib_drain_cq(priv);
830
831 msleep(1);
832 }
833
834 ipoib_dbg(priv, "All sends and receives done.\n");
835
836 timeout:
837 del_timer_sync(&priv->poll_timer);
838 qp_attr.qp_state = IB_QPS_RESET;
839 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
840 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
841
842 /* Wait for all AHs to be reaped */
843 set_bit(IPOIB_STOP_REAPER, &priv->flags);
844 cancel_delayed_work(&priv->ah_reap_task);
845 if (flush)
846 flush_workqueue(ipoib_workqueue);
847
848 ipoib_ah_dev_cleanup(priv);
849
850 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
851
852 return 0;
853 }
854
ipoib_ib_dev_init(struct ipoib_dev_priv * priv,struct ib_device * ca,int port)855 int ipoib_ib_dev_init(struct ipoib_dev_priv *priv, struct ib_device *ca, int port)
856 {
857 if_t dev = priv->dev;
858
859 priv->ca = ca;
860 priv->port = port;
861 priv->qp = NULL;
862
863 if (ipoib_transport_dev_init(priv, ca)) {
864 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
865 return -ENODEV;
866 }
867
868 setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
869 (unsigned long) priv);
870
871 if (if_getflags(dev) & IFF_UP) {
872 if (ipoib_ib_dev_open(priv)) {
873 ipoib_transport_dev_cleanup(priv);
874 return -ENODEV;
875 }
876 }
877
878 return 0;
879 }
880
__ipoib_ib_dev_flush(struct ipoib_dev_priv * priv,enum ipoib_flush_level level)881 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
882 enum ipoib_flush_level level)
883 {
884 struct ipoib_dev_priv *cpriv;
885 u16 new_index;
886
887 mutex_lock(&priv->vlan_mutex);
888
889 /*
890 * Flush any child interfaces too -- they might be up even if
891 * the parent is down.
892 */
893 list_for_each_entry(cpriv, &priv->child_intfs, list)
894 __ipoib_ib_dev_flush(cpriv, level);
895
896 mutex_unlock(&priv->vlan_mutex);
897
898 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
899 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
900 return;
901 }
902
903 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
904 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
905 return;
906 }
907
908 if (level == IPOIB_FLUSH_HEAVY) {
909 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
910 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
911 ipoib_ib_dev_down(priv, 0);
912 ipoib_ib_dev_stop(priv, 0);
913 if (ipoib_pkey_dev_delay_open(priv))
914 return;
915 }
916
917 /* restart QP only if P_Key index is changed */
918 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
919 new_index == priv->pkey_index) {
920 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
921 return;
922 }
923 priv->pkey_index = new_index;
924 }
925
926 if (level == IPOIB_FLUSH_LIGHT) {
927 ipoib_mark_paths_invalid(priv);
928 ipoib_mcast_dev_flush(priv);
929 }
930
931 if (level >= IPOIB_FLUSH_NORMAL)
932 ipoib_ib_dev_down(priv, 0);
933
934 if (level == IPOIB_FLUSH_HEAVY) {
935 ipoib_ib_dev_stop(priv, 0);
936 ipoib_ib_dev_open(priv);
937 }
938
939 /*
940 * The device could have been brought down between the start and when
941 * we get here, don't bring it back up if it's not configured up
942 */
943 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
944 if (level >= IPOIB_FLUSH_NORMAL)
945 ipoib_ib_dev_up(priv);
946 ipoib_mcast_restart_task(&priv->restart_task);
947 }
948 }
949
ipoib_ib_dev_flush_light(struct work_struct * work)950 void ipoib_ib_dev_flush_light(struct work_struct *work)
951 {
952 struct ipoib_dev_priv *priv =
953 container_of(work, struct ipoib_dev_priv, flush_light);
954
955 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
956 }
957
ipoib_ib_dev_flush_normal(struct work_struct * work)958 void ipoib_ib_dev_flush_normal(struct work_struct *work)
959 {
960 struct ipoib_dev_priv *priv =
961 container_of(work, struct ipoib_dev_priv, flush_normal);
962
963 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
964 }
965
ipoib_ib_dev_flush_heavy(struct work_struct * work)966 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
967 {
968 struct ipoib_dev_priv *priv =
969 container_of(work, struct ipoib_dev_priv, flush_heavy);
970
971 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
972 }
973
ipoib_ib_dev_cleanup(struct ipoib_dev_priv * priv)974 void ipoib_ib_dev_cleanup(struct ipoib_dev_priv *priv)
975 {
976
977 ipoib_dbg(priv, "cleaning up ib_dev\n");
978
979 ipoib_mcast_stop_thread(priv, 1);
980 ipoib_mcast_dev_flush(priv);
981
982 ipoib_ah_dev_cleanup(priv);
983 ipoib_transport_dev_cleanup(priv);
984 }
985
986 /*
987 * Delayed P_Key Assigment Interim Support
988 *
989 * The following is initial implementation of delayed P_Key assigment
990 * mechanism. It is using the same approach implemented for the multicast
991 * group join. The single goal of this implementation is to quickly address
992 * Bug #2507. This implementation will probably be removed when the P_Key
993 * change async notification is available.
994 */
995
ipoib_pkey_poll(struct work_struct * work)996 void ipoib_pkey_poll(struct work_struct *work)
997 {
998 struct ipoib_dev_priv *priv =
999 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
1000
1001 ipoib_pkey_dev_check_presence(priv);
1002
1003 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
1004 ipoib_open(priv);
1005 else {
1006 mutex_lock(&pkey_mutex);
1007 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
1008 queue_delayed_work(ipoib_workqueue,
1009 &priv->pkey_poll_task,
1010 HZ);
1011 mutex_unlock(&pkey_mutex);
1012 }
1013 }
1014
ipoib_pkey_dev_delay_open(struct ipoib_dev_priv * priv)1015 int ipoib_pkey_dev_delay_open(struct ipoib_dev_priv *priv)
1016 {
1017
1018 /* Look for the interface pkey value in the IB Port P_Key table and */
1019 /* set the interface pkey assigment flag */
1020 ipoib_pkey_dev_check_presence(priv);
1021
1022 /* P_Key value not assigned yet - start polling */
1023 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
1024 mutex_lock(&pkey_mutex);
1025 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1026 queue_delayed_work(ipoib_workqueue,
1027 &priv->pkey_poll_task,
1028 HZ);
1029 mutex_unlock(&pkey_mutex);
1030 return 1;
1031 }
1032
1033 return 0;
1034 }
1035