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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 <linux/delay.h>
37#include <linux/moduleparam.h>
38#include <linux/dma-mapping.h>
39#include <linux/slab.h>
40
41#include <linux/ip.h>
42#include <linux/tcp.h>
43#include <rdma/ib_cache.h>
44
45#include "ipoib.h"
46
47#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
48static int data_debug_level;
49
50module_param(data_debug_level, int, 0644);
51MODULE_PARM_DESC(data_debug_level,
52 "Enable data path debug tracing if > 0");
53#endif
54
55struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
56 struct ib_pd *pd, struct rdma_ah_attr *attr)
57{
58 struct ipoib_ah *ah;
59 struct ib_ah *vah;
60
61 ah = kmalloc(sizeof(*ah), GFP_KERNEL);
62 if (!ah)
63 return ERR_PTR(-ENOMEM);
64
65 ah->dev = dev;
66 ah->last_send = 0;
67 kref_init(&ah->ref);
68
69 vah = rdma_create_ah(pd, attr, RDMA_CREATE_AH_SLEEPABLE);
70 if (IS_ERR(vah)) {
71 kfree(ah);
72 ah = (struct ipoib_ah *)vah;
73 } else {
74 ah->ah = vah;
75 ipoib_dbg(ipoib_priv(dev), "Created ah %p\n", ah->ah);
76 }
77
78 return ah;
79}
80
81void 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 = ipoib_priv(ah->dev);
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
93static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
94 u64 mapping[IPOIB_UD_RX_SG])
95{
96 ib_dma_unmap_single(priv->ca, mapping[0],
97 IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
98 DMA_FROM_DEVICE);
99}
100
101static int ipoib_ib_post_receive(struct net_device *dev, int id)
102{
103 struct ipoib_dev_priv *priv = ipoib_priv(dev);
104 int ret;
105
106 priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
107 priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
108 priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
109
110
111 ret = ib_post_recv(priv->qp, &priv->rx_wr, NULL);
112 if (unlikely(ret)) {
113 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
114 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
115 dev_kfree_skb_any(priv->rx_ring[id].skb);
116 priv->rx_ring[id].skb = NULL;
117 }
118
119 return ret;
120}
121
122static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
123{
124 struct ipoib_dev_priv *priv = ipoib_priv(dev);
125 struct sk_buff *skb;
126 int buf_size;
127 u64 *mapping;
128
129 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
130
131 skb = dev_alloc_skb(buf_size + IPOIB_HARD_LEN);
132 if (unlikely(!skb))
133 return NULL;
134
135 /*
136 * the IP header will be at IPOIP_HARD_LEN + IB_GRH_BYTES, that is
137 * 64 bytes aligned
138 */
139 skb_reserve(skb, sizeof(struct ipoib_pseudo_header));
140
141 mapping = priv->rx_ring[id].mapping;
142 mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
143 DMA_FROM_DEVICE);
144 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
145 goto error;
146
147 priv->rx_ring[id].skb = skb;
148 return skb;
149error:
150 dev_kfree_skb_any(skb);
151 return NULL;
152}
153
154static int ipoib_ib_post_receives(struct net_device *dev)
155{
156 struct ipoib_dev_priv *priv = ipoib_priv(dev);
157 int i;
158
159 for (i = 0; i < ipoib_recvq_size; ++i) {
160 if (!ipoib_alloc_rx_skb(dev, i)) {
161 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
162 return -ENOMEM;
163 }
164 if (ipoib_ib_post_receive(dev, i)) {
165 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
166 return -EIO;
167 }
168 }
169
170 return 0;
171}
172
173static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
174{
175 struct ipoib_dev_priv *priv = ipoib_priv(dev);
176 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
177 struct sk_buff *skb;
178 u64 mapping[IPOIB_UD_RX_SG];
179 union ib_gid *dgid;
180 union ib_gid *sgid;
181
182 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
183 wr_id, wc->status);
184
185 if (unlikely(wr_id >= ipoib_recvq_size)) {
186 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
187 wr_id, ipoib_recvq_size);
188 return;
189 }
190
191 skb = priv->rx_ring[wr_id].skb;
192
193 if (unlikely(wc->status != IB_WC_SUCCESS)) {
194 if (wc->status != IB_WC_WR_FLUSH_ERR)
195 ipoib_warn(priv,
196 "failed recv event (status=%d, wrid=%d vend_err %#x)\n",
197 wc->status, wr_id, wc->vendor_err);
198 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
199 dev_kfree_skb_any(skb);
200 priv->rx_ring[wr_id].skb = NULL;
201 return;
202 }
203
204 memcpy(mapping, priv->rx_ring[wr_id].mapping,
205 IPOIB_UD_RX_SG * sizeof(*mapping));
206
207 /*
208 * If we can't allocate a new RX buffer, dump
209 * this packet and reuse the old buffer.
210 */
211 if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
212 ++dev->stats.rx_dropped;
213 goto repost;
214 }
215
216 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
217 wc->byte_len, wc->slid);
218
219 ipoib_ud_dma_unmap_rx(priv, mapping);
220
221 skb_put(skb, wc->byte_len);
222
223 /* First byte of dgid signals multicast when 0xff */
224 dgid = &((struct ib_grh *)skb->data)->dgid;
225
226 if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff)
227 skb->pkt_type = PACKET_HOST;
228 else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0)
229 skb->pkt_type = PACKET_BROADCAST;
230 else
231 skb->pkt_type = PACKET_MULTICAST;
232
233 sgid = &((struct ib_grh *)skb->data)->sgid;
234
235 /*
236 * Drop packets that this interface sent, ie multicast packets
237 * that the HCA has replicated.
238 */
239 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) {
240 int need_repost = 1;
241
242 if ((wc->wc_flags & IB_WC_GRH) &&
243 sgid->global.interface_id != priv->local_gid.global.interface_id)
244 need_repost = 0;
245
246 if (need_repost) {
247 dev_kfree_skb_any(skb);
248 goto repost;
249 }
250 }
251
252 skb_pull(skb, IB_GRH_BYTES);
253
254 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
255 skb_add_pseudo_hdr(skb);
256
257 ++dev->stats.rx_packets;
258 dev->stats.rx_bytes += skb->len;
259 if (skb->pkt_type == PACKET_MULTICAST)
260 dev->stats.multicast++;
261
262 skb->dev = dev;
263 if ((dev->features & NETIF_F_RXCSUM) &&
264 likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
265 skb->ip_summed = CHECKSUM_UNNECESSARY;
266
267 napi_gro_receive(&priv->recv_napi, skb);
268
269repost:
270 if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
271 ipoib_warn(priv, "ipoib_ib_post_receive failed "
272 "for buf %d\n", wr_id);
273}
274
275int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req)
276{
277 struct sk_buff *skb = tx_req->skb;
278 u64 *mapping = tx_req->mapping;
279 int i;
280 int off;
281
282 if (skb_headlen(skb)) {
283 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
284 DMA_TO_DEVICE);
285 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
286 return -EIO;
287
288 off = 1;
289 } else
290 off = 0;
291
292 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
293 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
294 mapping[i + off] = ib_dma_map_page(ca,
295 skb_frag_page(frag),
296 skb_frag_off(frag),
297 skb_frag_size(frag),
298 DMA_TO_DEVICE);
299 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
300 goto partial_error;
301 }
302 return 0;
303
304partial_error:
305 for (; i > 0; --i) {
306 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
307
308 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE);
309 }
310
311 if (off)
312 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
313
314 return -EIO;
315}
316
317void ipoib_dma_unmap_tx(struct ipoib_dev_priv *priv,
318 struct ipoib_tx_buf *tx_req)
319{
320 struct sk_buff *skb = tx_req->skb;
321 u64 *mapping = tx_req->mapping;
322 int i;
323 int off;
324
325 if (skb_headlen(skb)) {
326 ib_dma_unmap_single(priv->ca, mapping[0], skb_headlen(skb),
327 DMA_TO_DEVICE);
328 off = 1;
329 } else
330 off = 0;
331
332 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
333 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
334
335 ib_dma_unmap_page(priv->ca, mapping[i + off],
336 skb_frag_size(frag), DMA_TO_DEVICE);
337 }
338}
339
340/*
341 * As the result of a completion error the QP Can be transferred to SQE states.
342 * The function checks if the (send)QP is in SQE state and
343 * moves it back to RTS state, that in order to have it functional again.
344 */
345static void ipoib_qp_state_validate_work(struct work_struct *work)
346{
347 struct ipoib_qp_state_validate *qp_work =
348 container_of(work, struct ipoib_qp_state_validate, work);
349
350 struct ipoib_dev_priv *priv = qp_work->priv;
351 struct ib_qp_attr qp_attr;
352 struct ib_qp_init_attr query_init_attr;
353 int ret;
354
355 ret = ib_query_qp(priv->qp, &qp_attr, IB_QP_STATE, &query_init_attr);
356 if (ret) {
357 ipoib_warn(priv, "%s: Failed to query QP ret: %d\n",
358 __func__, ret);
359 goto free_res;
360 }
361 pr_info("%s: QP: 0x%x is in state: %d\n",
362 __func__, priv->qp->qp_num, qp_attr.qp_state);
363
364 /* currently support only in SQE->RTS transition*/
365 if (qp_attr.qp_state == IB_QPS_SQE) {
366 qp_attr.qp_state = IB_QPS_RTS;
367
368 ret = ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE);
369 if (ret) {
370 pr_warn("failed(%d) modify QP:0x%x SQE->RTS\n",
371 ret, priv->qp->qp_num);
372 goto free_res;
373 }
374 pr_info("%s: QP: 0x%x moved from IB_QPS_SQE to IB_QPS_RTS\n",
375 __func__, priv->qp->qp_num);
376 } else {
377 pr_warn("QP (%d) will stay in state: %d\n",
378 priv->qp->qp_num, qp_attr.qp_state);
379 }
380
381free_res:
382 kfree(qp_work);
383}
384
385static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
386{
387 struct ipoib_dev_priv *priv = ipoib_priv(dev);
388 unsigned int wr_id = wc->wr_id;
389 struct ipoib_tx_buf *tx_req;
390
391 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
392 wr_id, wc->status);
393
394 if (unlikely(wr_id >= ipoib_sendq_size)) {
395 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
396 wr_id, ipoib_sendq_size);
397 return;
398 }
399
400 tx_req = &priv->tx_ring[wr_id];
401
402 ipoib_dma_unmap_tx(priv, tx_req);
403
404 ++dev->stats.tx_packets;
405 dev->stats.tx_bytes += tx_req->skb->len;
406
407 dev_kfree_skb_any(tx_req->skb);
408
409 ++priv->tx_tail;
410 ++priv->global_tx_tail;
411
412 if (unlikely(netif_queue_stopped(dev) &&
413 ((priv->global_tx_head - priv->global_tx_tail) <=
414 ipoib_sendq_size >> 1) &&
415 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)))
416 netif_wake_queue(dev);
417
418 if (wc->status != IB_WC_SUCCESS &&
419 wc->status != IB_WC_WR_FLUSH_ERR) {
420 struct ipoib_qp_state_validate *qp_work;
421 ipoib_warn(priv,
422 "failed send event (status=%d, wrid=%d vend_err %#x)\n",
423 wc->status, wr_id, wc->vendor_err);
424 qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC);
425 if (!qp_work)
426 return;
427
428 INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work);
429 qp_work->priv = priv;
430 queue_work(priv->wq, &qp_work->work);
431 }
432}
433
434static int poll_tx(struct ipoib_dev_priv *priv)
435{
436 int n, i;
437 struct ib_wc *wc;
438
439 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
440 for (i = 0; i < n; ++i) {
441 wc = priv->send_wc + i;
442 if (wc->wr_id & IPOIB_OP_CM)
443 ipoib_cm_handle_tx_wc(priv->dev, priv->send_wc + i);
444 else
445 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
446 }
447 return n == MAX_SEND_CQE;
448}
449
450int ipoib_rx_poll(struct napi_struct *napi, int budget)
451{
452 struct ipoib_dev_priv *priv =
453 container_of(napi, struct ipoib_dev_priv, recv_napi);
454 struct net_device *dev = priv->dev;
455 int done;
456 int t;
457 int n, i;
458
459 done = 0;
460
461poll_more:
462 while (done < budget) {
463 int max = (budget - done);
464
465 t = min(IPOIB_NUM_WC, max);
466 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
467
468 for (i = 0; i < n; i++) {
469 struct ib_wc *wc = priv->ibwc + i;
470
471 if (wc->wr_id & IPOIB_OP_RECV) {
472 ++done;
473 if (wc->wr_id & IPOIB_OP_CM)
474 ipoib_cm_handle_rx_wc(dev, wc);
475 else
476 ipoib_ib_handle_rx_wc(dev, wc);
477 } else {
478 pr_warn("%s: Got unexpected wqe id\n", __func__);
479 }
480 }
481
482 if (n != t)
483 break;
484 }
485
486 if (done < budget) {
487 napi_complete(napi);
488 if (unlikely(ib_req_notify_cq(priv->recv_cq,
489 IB_CQ_NEXT_COMP |
490 IB_CQ_REPORT_MISSED_EVENTS)) &&
491 napi_schedule(napi))
492 goto poll_more;
493 }
494
495 return done;
496}
497
498int ipoib_tx_poll(struct napi_struct *napi, int budget)
499{
500 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv,
501 send_napi);
502 struct net_device *dev = priv->dev;
503 int n, i;
504 struct ib_wc *wc;
505
506poll_more:
507 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
508
509 for (i = 0; i < n; i++) {
510 wc = priv->send_wc + i;
511 if (wc->wr_id & IPOIB_OP_CM)
512 ipoib_cm_handle_tx_wc(dev, wc);
513 else
514 ipoib_ib_handle_tx_wc(dev, wc);
515 }
516
517 if (n < budget) {
518 napi_complete(napi);
519 if (unlikely(ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
520 IB_CQ_REPORT_MISSED_EVENTS)) &&
521 napi_schedule(napi))
522 goto poll_more;
523 }
524 return n < 0 ? 0 : n;
525}
526
527void ipoib_ib_rx_completion(struct ib_cq *cq, void *ctx_ptr)
528{
529 struct ipoib_dev_priv *priv = ctx_ptr;
530
531 napi_schedule(&priv->recv_napi);
532}
533
534/* The function will force napi_schedule */
535void ipoib_napi_schedule_work(struct work_struct *work)
536{
537 struct ipoib_dev_priv *priv =
538 container_of(work, struct ipoib_dev_priv, reschedule_napi_work);
539 bool ret;
540
541 do {
542 ret = napi_schedule(&priv->send_napi);
543 if (!ret)
544 msleep(3);
545 } while (!ret && netif_queue_stopped(priv->dev) &&
546 test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags));
547}
548
549void ipoib_ib_tx_completion(struct ib_cq *cq, void *ctx_ptr)
550{
551 struct ipoib_dev_priv *priv = ctx_ptr;
552 bool ret;
553
554 ret = napi_schedule(&priv->send_napi);
555 /*
556 * if the queue is closed the driver must be able to schedule napi,
557 * otherwise we can end with closed queue forever, because no new
558 * packets to send and napi callback might not get new event after
559 * its re-arm of the napi.
560 */
561 if (!ret && netif_queue_stopped(priv->dev))
562 schedule_work(&priv->reschedule_napi_work);
563}
564
565static inline int post_send(struct ipoib_dev_priv *priv,
566 unsigned int wr_id,
567 struct ib_ah *address, u32 dqpn,
568 struct ipoib_tx_buf *tx_req,
569 void *head, int hlen)
570{
571 struct sk_buff *skb = tx_req->skb;
572
573 ipoib_build_sge(priv, tx_req);
574
575 priv->tx_wr.wr.wr_id = wr_id;
576 priv->tx_wr.remote_qpn = dqpn;
577 priv->tx_wr.ah = address;
578
579 if (head) {
580 priv->tx_wr.mss = skb_shinfo(skb)->gso_size;
581 priv->tx_wr.header = head;
582 priv->tx_wr.hlen = hlen;
583 priv->tx_wr.wr.opcode = IB_WR_LSO;
584 } else
585 priv->tx_wr.wr.opcode = IB_WR_SEND;
586
587 return ib_post_send(priv->qp, &priv->tx_wr.wr, NULL);
588}
589
590int ipoib_send(struct net_device *dev, struct sk_buff *skb,
591 struct ib_ah *address, u32 dqpn)
592{
593 struct ipoib_dev_priv *priv = ipoib_priv(dev);
594 struct ipoib_tx_buf *tx_req;
595 int hlen, rc;
596 void *phead;
597 unsigned int usable_sge = priv->max_send_sge - !!skb_headlen(skb);
598
599 if (skb_is_gso(skb)) {
600 hlen = skb_tcp_all_headers(skb);
601 phead = skb->data;
602 if (unlikely(!skb_pull(skb, hlen))) {
603 ipoib_warn(priv, "linear data too small\n");
604 ++dev->stats.tx_dropped;
605 ++dev->stats.tx_errors;
606 dev_kfree_skb_any(skb);
607 return -1;
608 }
609 } else {
610 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
611 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
612 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
613 ++dev->stats.tx_dropped;
614 ++dev->stats.tx_errors;
615 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
616 return -1;
617 }
618 phead = NULL;
619 hlen = 0;
620 }
621 if (skb_shinfo(skb)->nr_frags > usable_sge) {
622 if (skb_linearize(skb) < 0) {
623 ipoib_warn(priv, "skb could not be linearized\n");
624 ++dev->stats.tx_dropped;
625 ++dev->stats.tx_errors;
626 dev_kfree_skb_any(skb);
627 return -1;
628 }
629 /* Does skb_linearize return ok without reducing nr_frags? */
630 if (skb_shinfo(skb)->nr_frags > usable_sge) {
631 ipoib_warn(priv, "too many frags after skb linearize\n");
632 ++dev->stats.tx_dropped;
633 ++dev->stats.tx_errors;
634 dev_kfree_skb_any(skb);
635 return -1;
636 }
637 }
638
639 ipoib_dbg_data(priv,
640 "sending packet, length=%d address=%p dqpn=0x%06x\n",
641 skb->len, address, dqpn);
642
643 /*
644 * We put the skb into the tx_ring _before_ we call post_send()
645 * because it's entirely possible that the completion handler will
646 * run before we execute anything after the post_send(). That
647 * means we have to make sure everything is properly recorded and
648 * our state is consistent before we call post_send().
649 */
650 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
651 tx_req->skb = skb;
652 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
653 ++dev->stats.tx_errors;
654 dev_kfree_skb_any(skb);
655 return -1;
656 }
657
658 if (skb->ip_summed == CHECKSUM_PARTIAL)
659 priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM;
660 else
661 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
662 /* increase the tx_head after send success, but use it for queue state */
663 if ((priv->global_tx_head - priv->global_tx_tail) ==
664 ipoib_sendq_size - 1) {
665 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
666 netif_stop_queue(dev);
667 }
668
669 skb_orphan(skb);
670 skb_dst_drop(skb);
671
672 if (netif_queue_stopped(dev))
673 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
674 IB_CQ_REPORT_MISSED_EVENTS) < 0)
675 ipoib_warn(priv, "request notify on send CQ failed\n");
676
677 rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
678 address, dqpn, tx_req, phead, hlen);
679 if (unlikely(rc)) {
680 ipoib_warn(priv, "post_send failed, error %d\n", rc);
681 ++dev->stats.tx_errors;
682 ipoib_dma_unmap_tx(priv, tx_req);
683 dev_kfree_skb_any(skb);
684 if (netif_queue_stopped(dev))
685 netif_wake_queue(dev);
686 rc = 0;
687 } else {
688 netif_trans_update(dev);
689
690 rc = priv->tx_head;
691 ++priv->tx_head;
692 ++priv->global_tx_head;
693 }
694 return rc;
695}
696
697static void ipoib_reap_dead_ahs(struct ipoib_dev_priv *priv)
698{
699 struct ipoib_ah *ah, *tah;
700 unsigned long flags;
701
702 netif_tx_lock_bh(priv->dev);
703 spin_lock_irqsave(&priv->lock, flags);
704
705 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
706 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
707 list_del(&ah->list);
708 rdma_destroy_ah(ah->ah, 0);
709 kfree(ah);
710 }
711
712 spin_unlock_irqrestore(&priv->lock, flags);
713 netif_tx_unlock_bh(priv->dev);
714}
715
716void ipoib_reap_ah(struct work_struct *work)
717{
718 struct ipoib_dev_priv *priv =
719 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
720
721 ipoib_reap_dead_ahs(priv);
722
723 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
724 queue_delayed_work(priv->wq, &priv->ah_reap_task,
725 round_jiffies_relative(HZ));
726}
727
728static void ipoib_start_ah_reaper(struct ipoib_dev_priv *priv)
729{
730 clear_bit(IPOIB_STOP_REAPER, &priv->flags);
731 queue_delayed_work(priv->wq, &priv->ah_reap_task,
732 round_jiffies_relative(HZ));
733}
734
735static void ipoib_stop_ah_reaper(struct ipoib_dev_priv *priv)
736{
737 set_bit(IPOIB_STOP_REAPER, &priv->flags);
738 cancel_delayed_work(&priv->ah_reap_task);
739 /*
740 * After ipoib_stop_ah_reaper() we always go through
741 * ipoib_reap_dead_ahs() which ensures the work is really stopped and
742 * does a final flush out of the dead_ah's list
743 */
744}
745
746static int recvs_pending(struct net_device *dev)
747{
748 struct ipoib_dev_priv *priv = ipoib_priv(dev);
749 int pending = 0;
750 int i;
751
752 for (i = 0; i < ipoib_recvq_size; ++i)
753 if (priv->rx_ring[i].skb)
754 ++pending;
755
756 return pending;
757}
758
759static void check_qp_movement_and_print(struct ipoib_dev_priv *priv,
760 struct ib_qp *qp,
761 enum ib_qp_state new_state)
762{
763 struct ib_qp_attr qp_attr;
764 struct ib_qp_init_attr query_init_attr;
765 int ret;
766
767 ret = ib_query_qp(qp, &qp_attr, IB_QP_STATE, &query_init_attr);
768 if (ret) {
769 ipoib_warn(priv, "%s: Failed to query QP\n", __func__);
770 return;
771 }
772 /* print according to the new-state and the previous state.*/
773 if (new_state == IB_QPS_ERR && qp_attr.qp_state == IB_QPS_RESET)
774 ipoib_dbg(priv, "Failed modify QP, IB_QPS_RESET to IB_QPS_ERR, acceptable\n");
775 else
776 ipoib_warn(priv, "Failed to modify QP to state: %d from state: %d\n",
777 new_state, qp_attr.qp_state);
778}
779
780static void ipoib_napi_enable(struct net_device *dev)
781{
782 struct ipoib_dev_priv *priv = ipoib_priv(dev);
783
784 napi_enable(&priv->recv_napi);
785 napi_enable(&priv->send_napi);
786}
787
788static void ipoib_napi_disable(struct net_device *dev)
789{
790 struct ipoib_dev_priv *priv = ipoib_priv(dev);
791
792 napi_disable(&priv->recv_napi);
793 napi_disable(&priv->send_napi);
794}
795
796int ipoib_ib_dev_stop_default(struct net_device *dev)
797{
798 struct ipoib_dev_priv *priv = ipoib_priv(dev);
799 struct ib_qp_attr qp_attr;
800 unsigned long begin;
801 struct ipoib_tx_buf *tx_req;
802 int i;
803
804 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
805 ipoib_napi_disable(dev);
806
807 ipoib_cm_dev_stop(dev);
808
809 /*
810 * Move our QP to the error state and then reinitialize in
811 * when all work requests have completed or have been flushed.
812 */
813 qp_attr.qp_state = IB_QPS_ERR;
814 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
815 check_qp_movement_and_print(priv, priv->qp, IB_QPS_ERR);
816
817 /* Wait for all sends and receives to complete */
818 begin = jiffies;
819
820 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
821 if (time_after(jiffies, begin + 5 * HZ)) {
822 ipoib_warn(priv,
823 "timing out; %d sends %d receives not completed\n",
824 priv->tx_head - priv->tx_tail,
825 recvs_pending(dev));
826
827 /*
828 * assume the HW is wedged and just free up
829 * all our pending work requests.
830 */
831 while ((int)priv->tx_tail - (int)priv->tx_head < 0) {
832 tx_req = &priv->tx_ring[priv->tx_tail &
833 (ipoib_sendq_size - 1)];
834 ipoib_dma_unmap_tx(priv, tx_req);
835 dev_kfree_skb_any(tx_req->skb);
836 ++priv->tx_tail;
837 ++priv->global_tx_tail;
838 }
839
840 for (i = 0; i < ipoib_recvq_size; ++i) {
841 struct ipoib_rx_buf *rx_req;
842
843 rx_req = &priv->rx_ring[i];
844 if (!rx_req->skb)
845 continue;
846 ipoib_ud_dma_unmap_rx(priv,
847 priv->rx_ring[i].mapping);
848 dev_kfree_skb_any(rx_req->skb);
849 rx_req->skb = NULL;
850 }
851
852 goto timeout;
853 }
854
855 ipoib_drain_cq(dev);
856
857 usleep_range(1000, 2000);
858 }
859
860 ipoib_dbg(priv, "All sends and receives done.\n");
861
862timeout:
863 qp_attr.qp_state = IB_QPS_RESET;
864 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
865 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
866
867 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
868
869 return 0;
870}
871
872int ipoib_ib_dev_open_default(struct net_device *dev)
873{
874 struct ipoib_dev_priv *priv = ipoib_priv(dev);
875 int ret;
876
877 ret = ipoib_init_qp(dev);
878 if (ret) {
879 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
880 return -1;
881 }
882
883 ret = ipoib_ib_post_receives(dev);
884 if (ret) {
885 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
886 goto out;
887 }
888
889 ret = ipoib_cm_dev_open(dev);
890 if (ret) {
891 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
892 goto out;
893 }
894
895 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
896 ipoib_napi_enable(dev);
897
898 return 0;
899out:
900 return -1;
901}
902
903int ipoib_ib_dev_open(struct net_device *dev)
904{
905 struct ipoib_dev_priv *priv = ipoib_priv(dev);
906
907 ipoib_pkey_dev_check_presence(dev);
908
909 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
910 ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey,
911 (!(priv->pkey & 0x7fff) ? "Invalid" : "not found"));
912 return -1;
913 }
914
915 ipoib_start_ah_reaper(priv);
916 if (priv->rn_ops->ndo_open(dev)) {
917 pr_warn("%s: Failed to open dev\n", dev->name);
918 goto dev_stop;
919 }
920
921 set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
922
923 return 0;
924
925dev_stop:
926 ipoib_stop_ah_reaper(priv);
927 return -1;
928}
929
930void ipoib_ib_dev_stop(struct net_device *dev)
931{
932 struct ipoib_dev_priv *priv = ipoib_priv(dev);
933
934 priv->rn_ops->ndo_stop(dev);
935
936 clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
937 ipoib_stop_ah_reaper(priv);
938}
939
940void ipoib_pkey_dev_check_presence(struct net_device *dev)
941{
942 struct ipoib_dev_priv *priv = ipoib_priv(dev);
943 struct rdma_netdev *rn = netdev_priv(dev);
944
945 if (!(priv->pkey & 0x7fff) ||
946 ib_find_pkey(priv->ca, priv->port, priv->pkey,
947 &priv->pkey_index)) {
948 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
949 } else {
950 if (rn->set_id)
951 rn->set_id(dev, priv->pkey_index);
952 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
953 }
954}
955
956void ipoib_ib_dev_up(struct net_device *dev)
957{
958 struct ipoib_dev_priv *priv = ipoib_priv(dev);
959
960 ipoib_pkey_dev_check_presence(dev);
961
962 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
963 ipoib_dbg(priv, "PKEY is not assigned.\n");
964 return;
965 }
966
967 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
968
969 ipoib_mcast_start_thread(dev);
970}
971
972void ipoib_ib_dev_down(struct net_device *dev)
973{
974 struct ipoib_dev_priv *priv = ipoib_priv(dev);
975
976 ipoib_dbg(priv, "downing ib_dev\n");
977
978 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
979 netif_carrier_off(dev);
980
981 ipoib_mcast_stop_thread(dev);
982 ipoib_mcast_dev_flush(dev);
983
984 ipoib_flush_paths(dev);
985}
986
987void ipoib_drain_cq(struct net_device *dev)
988{
989 struct ipoib_dev_priv *priv = ipoib_priv(dev);
990 int i, n;
991
992 /*
993 * We call completion handling routines that expect to be
994 * called from the BH-disabled NAPI poll context, so disable
995 * BHs here too.
996 */
997 local_bh_disable();
998
999 do {
1000 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
1001 for (i = 0; i < n; ++i) {
1002 /*
1003 * Convert any successful completions to flush
1004 * errors to avoid passing packets up the
1005 * stack after bringing the device down.
1006 */
1007 if (priv->ibwc[i].status == IB_WC_SUCCESS)
1008 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
1009
1010 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
1011 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
1012 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
1013 else
1014 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
1015 } else {
1016 pr_warn("%s: Got unexpected wqe id\n", __func__);
1017 }
1018 }
1019 } while (n == IPOIB_NUM_WC);
1020
1021 while (poll_tx(priv))
1022 ; /* nothing */
1023
1024 local_bh_enable();
1025}
1026
1027/*
1028 * Takes whatever value which is in pkey index 0 and updates priv->pkey
1029 * returns 0 if the pkey value was changed.
1030 */
1031static inline int update_parent_pkey(struct ipoib_dev_priv *priv)
1032{
1033 int result;
1034 u16 prev_pkey;
1035
1036 prev_pkey = priv->pkey;
1037 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
1038 if (result) {
1039 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n",
1040 priv->port, result);
1041 return result;
1042 }
1043
1044 priv->pkey |= 0x8000;
1045
1046 if (prev_pkey != priv->pkey) {
1047 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n",
1048 prev_pkey, priv->pkey);
1049 /*
1050 * Update the pkey in the broadcast address, while making sure to set
1051 * the full membership bit, so that we join the right broadcast group.
1052 */
1053 priv->dev->broadcast[8] = priv->pkey >> 8;
1054 priv->dev->broadcast[9] = priv->pkey & 0xff;
1055 return 0;
1056 }
1057
1058 return 1;
1059}
1060/*
1061 * returns 0 if pkey value was found in a different slot.
1062 */
1063static inline int update_child_pkey(struct ipoib_dev_priv *priv)
1064{
1065 u16 old_index = priv->pkey_index;
1066
1067 priv->pkey_index = 0;
1068 ipoib_pkey_dev_check_presence(priv->dev);
1069
1070 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
1071 (old_index == priv->pkey_index))
1072 return 1;
1073 return 0;
1074}
1075
1076/*
1077 * returns true if the device address of the ipoib interface has changed and the
1078 * new address is a valid one (i.e in the gid table), return false otherwise.
1079 */
1080static bool ipoib_dev_addr_changed_valid(struct ipoib_dev_priv *priv)
1081{
1082 union ib_gid search_gid;
1083 union ib_gid gid0;
1084 int err;
1085 u16 index;
1086 u32 port;
1087 bool ret = false;
1088
1089 if (rdma_query_gid(priv->ca, priv->port, 0, &gid0))
1090 return false;
1091
1092 netif_addr_lock_bh(priv->dev);
1093
1094 /* The subnet prefix may have changed, update it now so we won't have
1095 * to do it later
1096 */
1097 priv->local_gid.global.subnet_prefix = gid0.global.subnet_prefix;
1098 dev_addr_mod(priv->dev, 4, (u8 *)&gid0.global.subnet_prefix,
1099 sizeof(gid0.global.subnet_prefix));
1100 search_gid.global.subnet_prefix = gid0.global.subnet_prefix;
1101
1102 search_gid.global.interface_id = priv->local_gid.global.interface_id;
1103
1104 netif_addr_unlock_bh(priv->dev);
1105
1106 err = ib_find_gid(priv->ca, &search_gid, &port, &index);
1107
1108 netif_addr_lock_bh(priv->dev);
1109
1110 if (search_gid.global.interface_id !=
1111 priv->local_gid.global.interface_id)
1112 /* There was a change while we were looking up the gid, bail
1113 * here and let the next work sort this out
1114 */
1115 goto out;
1116
1117 /* The next section of code needs some background:
1118 * Per IB spec the port GUID can't change if the HCA is powered on.
1119 * port GUID is the basis for GID at index 0 which is the basis for
1120 * the default device address of a ipoib interface.
1121 *
1122 * so it seems the flow should be:
1123 * if user_changed_dev_addr && gid in gid tbl
1124 * set bit dev_addr_set
1125 * return true
1126 * else
1127 * return false
1128 *
1129 * The issue is that there are devices that don't follow the spec,
1130 * they change the port GUID when the HCA is powered, so in order
1131 * not to break userspace applications, We need to check if the
1132 * user wanted to control the device address and we assume that
1133 * if he sets the device address back to be based on GID index 0,
1134 * he no longer wishs to control it.
1135 *
1136 * If the user doesn't control the device address,
1137 * IPOIB_FLAG_DEV_ADDR_SET is set and ib_find_gid failed it means
1138 * the port GUID has changed and GID at index 0 has changed
1139 * so we need to change priv->local_gid and priv->dev->dev_addr
1140 * to reflect the new GID.
1141 */
1142 if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
1143 if (!err && port == priv->port) {
1144 set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1145 if (index == 0)
1146 clear_bit(IPOIB_FLAG_DEV_ADDR_CTRL,
1147 &priv->flags);
1148 else
1149 set_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags);
1150 ret = true;
1151 } else {
1152 ret = false;
1153 }
1154 } else {
1155 if (!err && port == priv->port) {
1156 ret = true;
1157 } else {
1158 if (!test_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags)) {
1159 memcpy(&priv->local_gid, &gid0,
1160 sizeof(priv->local_gid));
1161 dev_addr_mod(priv->dev, 4, (u8 *)&gid0,
1162 sizeof(priv->local_gid));
1163 ret = true;
1164 }
1165 }
1166 }
1167
1168out:
1169 netif_addr_unlock_bh(priv->dev);
1170
1171 return ret;
1172}
1173
1174static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
1175 enum ipoib_flush_level level,
1176 int nesting)
1177{
1178 struct ipoib_dev_priv *cpriv;
1179 struct net_device *dev = priv->dev;
1180 int result;
1181
1182 down_read_nested(&priv->vlan_rwsem, nesting);
1183
1184 /*
1185 * Flush any child interfaces too -- they might be up even if
1186 * the parent is down.
1187 */
1188 list_for_each_entry(cpriv, &priv->child_intfs, list)
1189 __ipoib_ib_dev_flush(cpriv, level, nesting + 1);
1190
1191 up_read(&priv->vlan_rwsem);
1192
1193 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) &&
1194 level != IPOIB_FLUSH_HEAVY) {
1195 /* Make sure the dev_addr is set even if not flushing */
1196 if (level == IPOIB_FLUSH_LIGHT)
1197 ipoib_dev_addr_changed_valid(priv);
1198 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
1199 return;
1200 }
1201
1202 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1203 /* interface is down. update pkey and leave. */
1204 if (level == IPOIB_FLUSH_HEAVY) {
1205 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1206 update_parent_pkey(priv);
1207 else
1208 update_child_pkey(priv);
1209 } else if (level == IPOIB_FLUSH_LIGHT)
1210 ipoib_dev_addr_changed_valid(priv);
1211 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
1212 return;
1213 }
1214
1215 if (level == IPOIB_FLUSH_HEAVY) {
1216 /* child devices chase their origin pkey value, while non-child
1217 * (parent) devices should always takes what present in pkey index 0
1218 */
1219 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
1220 result = update_child_pkey(priv);
1221 if (result) {
1222 /* restart QP only if P_Key index is changed */
1223 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
1224 return;
1225 }
1226
1227 } else {
1228 result = update_parent_pkey(priv);
1229 /* restart QP only if P_Key value changed */
1230 if (result) {
1231 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n");
1232 return;
1233 }
1234 }
1235 }
1236
1237 if (level == IPOIB_FLUSH_LIGHT) {
1238 int oper_up;
1239 ipoib_mark_paths_invalid(dev);
1240 /* Set IPoIB operation as down to prevent races between:
1241 * the flush flow which leaves MCG and on the fly joins
1242 * which can happen during that time. mcast restart task
1243 * should deal with join requests we missed.
1244 */
1245 oper_up = test_and_clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
1246 ipoib_mcast_dev_flush(dev);
1247 if (oper_up)
1248 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
1249 ipoib_reap_dead_ahs(priv);
1250 }
1251
1252 if (level >= IPOIB_FLUSH_NORMAL)
1253 ipoib_ib_dev_down(dev);
1254
1255 if (level == IPOIB_FLUSH_HEAVY) {
1256 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
1257 ipoib_ib_dev_stop(dev);
1258
1259 if (ipoib_ib_dev_open(dev))
1260 return;
1261
1262 if (netif_queue_stopped(dev))
1263 netif_start_queue(dev);
1264 }
1265
1266 /*
1267 * The device could have been brought down between the start and when
1268 * we get here, don't bring it back up if it's not configured up
1269 */
1270 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1271 if (level >= IPOIB_FLUSH_NORMAL)
1272 ipoib_ib_dev_up(dev);
1273 if (ipoib_dev_addr_changed_valid(priv))
1274 ipoib_mcast_restart_task(&priv->restart_task);
1275 }
1276}
1277
1278void ipoib_ib_dev_flush_light(struct work_struct *work)
1279{
1280 struct ipoib_dev_priv *priv =
1281 container_of(work, struct ipoib_dev_priv, flush_light);
1282
1283 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0);
1284}
1285
1286void ipoib_ib_dev_flush_normal(struct work_struct *work)
1287{
1288 struct ipoib_dev_priv *priv =
1289 container_of(work, struct ipoib_dev_priv, flush_normal);
1290
1291 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0);
1292}
1293
1294void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1295{
1296 struct ipoib_dev_priv *priv =
1297 container_of(work, struct ipoib_dev_priv, flush_heavy);
1298
1299 rtnl_lock();
1300 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0);
1301 rtnl_unlock();
1302}
1303
1304void ipoib_ib_dev_cleanup(struct net_device *dev)
1305{
1306 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1307
1308 ipoib_dbg(priv, "cleaning up ib_dev\n");
1309 /*
1310 * We must make sure there are no more (path) completions
1311 * that may wish to touch priv fields that are no longer valid
1312 */
1313 ipoib_flush_paths(dev);
1314
1315 ipoib_mcast_stop_thread(dev);
1316 ipoib_mcast_dev_flush(dev);
1317
1318 /*
1319 * All of our ah references aren't free until after
1320 * ipoib_mcast_dev_flush(), ipoib_flush_paths, and
1321 * the neighbor garbage collection is stopped and reaped.
1322 * That should all be done now, so make a final ah flush.
1323 */
1324 ipoib_reap_dead_ahs(priv);
1325
1326 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
1327
1328 priv->rn_ops->ndo_uninit(dev);
1329
1330 if (priv->pd) {
1331 ib_dealloc_pd(priv->pd);
1332 priv->pd = NULL;
1333 }
1334}
1335
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 <linux/delay.h>
37#include <linux/moduleparam.h>
38#include <linux/dma-mapping.h>
39#include <linux/slab.h>
40
41#include <linux/ip.h>
42#include <linux/tcp.h>
43#include <rdma/ib_cache.h>
44
45#include "ipoib.h"
46
47#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
48static int data_debug_level;
49
50module_param(data_debug_level, int, 0644);
51MODULE_PARM_DESC(data_debug_level,
52 "Enable data path debug tracing if > 0");
53#endif
54
55struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
56 struct ib_pd *pd, struct rdma_ah_attr *attr)
57{
58 struct ipoib_ah *ah;
59 struct ib_ah *vah;
60
61 ah = kmalloc(sizeof(*ah), GFP_KERNEL);
62 if (!ah)
63 return ERR_PTR(-ENOMEM);
64
65 ah->dev = dev;
66 ah->last_send = 0;
67 kref_init(&ah->ref);
68
69 vah = rdma_create_ah(pd, attr, RDMA_CREATE_AH_SLEEPABLE);
70 if (IS_ERR(vah)) {
71 kfree(ah);
72 ah = (struct ipoib_ah *)vah;
73 } else {
74 ah->ah = vah;
75 ipoib_dbg(ipoib_priv(dev), "Created ah %p\n", ah->ah);
76 }
77
78 return ah;
79}
80
81void 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 = ipoib_priv(ah->dev);
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
93static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
94 u64 mapping[IPOIB_UD_RX_SG])
95{
96 ib_dma_unmap_single(priv->ca, mapping[0],
97 IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
98 DMA_FROM_DEVICE);
99}
100
101static int ipoib_ib_post_receive(struct net_device *dev, int id)
102{
103 struct ipoib_dev_priv *priv = ipoib_priv(dev);
104 int ret;
105
106 priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
107 priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
108 priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
109
110
111 ret = ib_post_recv(priv->qp, &priv->rx_wr, NULL);
112 if (unlikely(ret)) {
113 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
114 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
115 dev_kfree_skb_any(priv->rx_ring[id].skb);
116 priv->rx_ring[id].skb = NULL;
117 }
118
119 return ret;
120}
121
122static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
123{
124 struct ipoib_dev_priv *priv = ipoib_priv(dev);
125 struct sk_buff *skb;
126 int buf_size;
127 u64 *mapping;
128
129 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
130
131 skb = dev_alloc_skb(buf_size + IPOIB_HARD_LEN);
132 if (unlikely(!skb))
133 return NULL;
134
135 /*
136 * the IP header will be at IPOIP_HARD_LEN + IB_GRH_BYTES, that is
137 * 64 bytes aligned
138 */
139 skb_reserve(skb, sizeof(struct ipoib_pseudo_header));
140
141 mapping = priv->rx_ring[id].mapping;
142 mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
143 DMA_FROM_DEVICE);
144 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
145 goto error;
146
147 priv->rx_ring[id].skb = skb;
148 return skb;
149error:
150 dev_kfree_skb_any(skb);
151 return NULL;
152}
153
154static int ipoib_ib_post_receives(struct net_device *dev)
155{
156 struct ipoib_dev_priv *priv = ipoib_priv(dev);
157 int i;
158
159 for (i = 0; i < ipoib_recvq_size; ++i) {
160 if (!ipoib_alloc_rx_skb(dev, i)) {
161 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
162 return -ENOMEM;
163 }
164 if (ipoib_ib_post_receive(dev, i)) {
165 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
166 return -EIO;
167 }
168 }
169
170 return 0;
171}
172
173static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
174{
175 struct ipoib_dev_priv *priv = ipoib_priv(dev);
176 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
177 struct sk_buff *skb;
178 u64 mapping[IPOIB_UD_RX_SG];
179 union ib_gid *dgid;
180 union ib_gid *sgid;
181
182 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
183 wr_id, wc->status);
184
185 if (unlikely(wr_id >= ipoib_recvq_size)) {
186 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
187 wr_id, ipoib_recvq_size);
188 return;
189 }
190
191 skb = priv->rx_ring[wr_id].skb;
192
193 if (unlikely(wc->status != IB_WC_SUCCESS)) {
194 if (wc->status != IB_WC_WR_FLUSH_ERR)
195 ipoib_warn(priv,
196 "failed recv event (status=%d, wrid=%d vend_err %#x)\n",
197 wc->status, wr_id, wc->vendor_err);
198 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
199 dev_kfree_skb_any(skb);
200 priv->rx_ring[wr_id].skb = NULL;
201 return;
202 }
203
204 memcpy(mapping, priv->rx_ring[wr_id].mapping,
205 IPOIB_UD_RX_SG * sizeof(*mapping));
206
207 /*
208 * If we can't allocate a new RX buffer, dump
209 * this packet and reuse the old buffer.
210 */
211 if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
212 ++dev->stats.rx_dropped;
213 goto repost;
214 }
215
216 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
217 wc->byte_len, wc->slid);
218
219 ipoib_ud_dma_unmap_rx(priv, mapping);
220
221 skb_put(skb, wc->byte_len);
222
223 /* First byte of dgid signals multicast when 0xff */
224 dgid = &((struct ib_grh *)skb->data)->dgid;
225
226 if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff)
227 skb->pkt_type = PACKET_HOST;
228 else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0)
229 skb->pkt_type = PACKET_BROADCAST;
230 else
231 skb->pkt_type = PACKET_MULTICAST;
232
233 sgid = &((struct ib_grh *)skb->data)->sgid;
234
235 /*
236 * Drop packets that this interface sent, ie multicast packets
237 * that the HCA has replicated.
238 */
239 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) {
240 int need_repost = 1;
241
242 if ((wc->wc_flags & IB_WC_GRH) &&
243 sgid->global.interface_id != priv->local_gid.global.interface_id)
244 need_repost = 0;
245
246 if (need_repost) {
247 dev_kfree_skb_any(skb);
248 goto repost;
249 }
250 }
251
252 skb_pull(skb, IB_GRH_BYTES);
253
254 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
255 skb_add_pseudo_hdr(skb);
256
257 ++dev->stats.rx_packets;
258 dev->stats.rx_bytes += skb->len;
259 if (skb->pkt_type == PACKET_MULTICAST)
260 dev->stats.multicast++;
261
262 skb->dev = dev;
263 if ((dev->features & NETIF_F_RXCSUM) &&
264 likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
265 skb->ip_summed = CHECKSUM_UNNECESSARY;
266
267 napi_gro_receive(&priv->recv_napi, skb);
268
269repost:
270 if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
271 ipoib_warn(priv, "ipoib_ib_post_receive failed "
272 "for buf %d\n", wr_id);
273}
274
275int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req)
276{
277 struct sk_buff *skb = tx_req->skb;
278 u64 *mapping = tx_req->mapping;
279 int i;
280 int off;
281
282 if (skb_headlen(skb)) {
283 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
284 DMA_TO_DEVICE);
285 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
286 return -EIO;
287
288 off = 1;
289 } else
290 off = 0;
291
292 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
293 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
294 mapping[i + off] = ib_dma_map_page(ca,
295 skb_frag_page(frag),
296 skb_frag_off(frag),
297 skb_frag_size(frag),
298 DMA_TO_DEVICE);
299 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
300 goto partial_error;
301 }
302 return 0;
303
304partial_error:
305 for (; i > 0; --i) {
306 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
307
308 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE);
309 }
310
311 if (off)
312 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
313
314 return -EIO;
315}
316
317void ipoib_dma_unmap_tx(struct ipoib_dev_priv *priv,
318 struct ipoib_tx_buf *tx_req)
319{
320 struct sk_buff *skb = tx_req->skb;
321 u64 *mapping = tx_req->mapping;
322 int i;
323 int off;
324
325 if (skb_headlen(skb)) {
326 ib_dma_unmap_single(priv->ca, mapping[0], skb_headlen(skb),
327 DMA_TO_DEVICE);
328 off = 1;
329 } else
330 off = 0;
331
332 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
333 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
334
335 ib_dma_unmap_page(priv->ca, mapping[i + off],
336 skb_frag_size(frag), DMA_TO_DEVICE);
337 }
338}
339
340/*
341 * As the result of a completion error the QP Can be transferred to SQE states.
342 * The function checks if the (send)QP is in SQE state and
343 * moves it back to RTS state, that in order to have it functional again.
344 */
345static void ipoib_qp_state_validate_work(struct work_struct *work)
346{
347 struct ipoib_qp_state_validate *qp_work =
348 container_of(work, struct ipoib_qp_state_validate, work);
349
350 struct ipoib_dev_priv *priv = qp_work->priv;
351 struct ib_qp_attr qp_attr;
352 struct ib_qp_init_attr query_init_attr;
353 int ret;
354
355 ret = ib_query_qp(priv->qp, &qp_attr, IB_QP_STATE, &query_init_attr);
356 if (ret) {
357 ipoib_warn(priv, "%s: Failed to query QP ret: %d\n",
358 __func__, ret);
359 goto free_res;
360 }
361 pr_info("%s: QP: 0x%x is in state: %d\n",
362 __func__, priv->qp->qp_num, qp_attr.qp_state);
363
364 /* currently support only in SQE->RTS transition*/
365 if (qp_attr.qp_state == IB_QPS_SQE) {
366 qp_attr.qp_state = IB_QPS_RTS;
367
368 ret = ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE);
369 if (ret) {
370 pr_warn("failed(%d) modify QP:0x%x SQE->RTS\n",
371 ret, priv->qp->qp_num);
372 goto free_res;
373 }
374 pr_info("%s: QP: 0x%x moved from IB_QPS_SQE to IB_QPS_RTS\n",
375 __func__, priv->qp->qp_num);
376 } else {
377 pr_warn("QP (%d) will stay in state: %d\n",
378 priv->qp->qp_num, qp_attr.qp_state);
379 }
380
381free_res:
382 kfree(qp_work);
383}
384
385static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
386{
387 struct ipoib_dev_priv *priv = ipoib_priv(dev);
388 unsigned int wr_id = wc->wr_id;
389 struct ipoib_tx_buf *tx_req;
390
391 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
392 wr_id, wc->status);
393
394 if (unlikely(wr_id >= ipoib_sendq_size)) {
395 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
396 wr_id, ipoib_sendq_size);
397 return;
398 }
399
400 tx_req = &priv->tx_ring[wr_id];
401
402 ipoib_dma_unmap_tx(priv, tx_req);
403
404 ++dev->stats.tx_packets;
405 dev->stats.tx_bytes += tx_req->skb->len;
406
407 dev_kfree_skb_any(tx_req->skb);
408
409 ++priv->tx_tail;
410 ++priv->global_tx_tail;
411
412 if (unlikely(netif_queue_stopped(dev) &&
413 ((priv->global_tx_head - priv->global_tx_tail) <=
414 ipoib_sendq_size >> 1) &&
415 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)))
416 netif_wake_queue(dev);
417
418 if (wc->status != IB_WC_SUCCESS &&
419 wc->status != IB_WC_WR_FLUSH_ERR) {
420 struct ipoib_qp_state_validate *qp_work;
421 ipoib_warn(priv,
422 "failed send event (status=%d, wrid=%d vend_err %#x)\n",
423 wc->status, wr_id, wc->vendor_err);
424 qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC);
425 if (!qp_work)
426 return;
427
428 INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work);
429 qp_work->priv = priv;
430 queue_work(priv->wq, &qp_work->work);
431 }
432}
433
434static int poll_tx(struct ipoib_dev_priv *priv)
435{
436 int n, i;
437 struct ib_wc *wc;
438
439 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
440 for (i = 0; i < n; ++i) {
441 wc = priv->send_wc + i;
442 if (wc->wr_id & IPOIB_OP_CM)
443 ipoib_cm_handle_tx_wc(priv->dev, priv->send_wc + i);
444 else
445 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
446 }
447 return n == MAX_SEND_CQE;
448}
449
450int ipoib_rx_poll(struct napi_struct *napi, int budget)
451{
452 struct ipoib_dev_priv *priv =
453 container_of(napi, struct ipoib_dev_priv, recv_napi);
454 struct net_device *dev = priv->dev;
455 int done;
456 int t;
457 int n, i;
458
459 done = 0;
460
461poll_more:
462 while (done < budget) {
463 int max = (budget - done);
464
465 t = min(IPOIB_NUM_WC, max);
466 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
467
468 for (i = 0; i < n; i++) {
469 struct ib_wc *wc = priv->ibwc + i;
470
471 if (wc->wr_id & IPOIB_OP_RECV) {
472 ++done;
473 if (wc->wr_id & IPOIB_OP_CM)
474 ipoib_cm_handle_rx_wc(dev, wc);
475 else
476 ipoib_ib_handle_rx_wc(dev, wc);
477 } else {
478 pr_warn("%s: Got unexpected wqe id\n", __func__);
479 }
480 }
481
482 if (n != t)
483 break;
484 }
485
486 if (done < budget) {
487 napi_complete(napi);
488 if (unlikely(ib_req_notify_cq(priv->recv_cq,
489 IB_CQ_NEXT_COMP |
490 IB_CQ_REPORT_MISSED_EVENTS)) &&
491 napi_reschedule(napi))
492 goto poll_more;
493 }
494
495 return done;
496}
497
498int ipoib_tx_poll(struct napi_struct *napi, int budget)
499{
500 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv,
501 send_napi);
502 struct net_device *dev = priv->dev;
503 int n, i;
504 struct ib_wc *wc;
505
506poll_more:
507 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
508
509 for (i = 0; i < n; i++) {
510 wc = priv->send_wc + i;
511 if (wc->wr_id & IPOIB_OP_CM)
512 ipoib_cm_handle_tx_wc(dev, wc);
513 else
514 ipoib_ib_handle_tx_wc(dev, wc);
515 }
516
517 if (n < budget) {
518 napi_complete(napi);
519 if (unlikely(ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
520 IB_CQ_REPORT_MISSED_EVENTS)) &&
521 napi_reschedule(napi))
522 goto poll_more;
523 }
524 return n < 0 ? 0 : n;
525}
526
527void ipoib_ib_rx_completion(struct ib_cq *cq, void *ctx_ptr)
528{
529 struct ipoib_dev_priv *priv = ctx_ptr;
530
531 napi_schedule(&priv->recv_napi);
532}
533
534void ipoib_ib_tx_completion(struct ib_cq *cq, void *ctx_ptr)
535{
536 struct ipoib_dev_priv *priv = ctx_ptr;
537
538 napi_schedule(&priv->send_napi);
539}
540
541static inline int post_send(struct ipoib_dev_priv *priv,
542 unsigned int wr_id,
543 struct ib_ah *address, u32 dqpn,
544 struct ipoib_tx_buf *tx_req,
545 void *head, int hlen)
546{
547 struct sk_buff *skb = tx_req->skb;
548
549 ipoib_build_sge(priv, tx_req);
550
551 priv->tx_wr.wr.wr_id = wr_id;
552 priv->tx_wr.remote_qpn = dqpn;
553 priv->tx_wr.ah = address;
554
555 if (head) {
556 priv->tx_wr.mss = skb_shinfo(skb)->gso_size;
557 priv->tx_wr.header = head;
558 priv->tx_wr.hlen = hlen;
559 priv->tx_wr.wr.opcode = IB_WR_LSO;
560 } else
561 priv->tx_wr.wr.opcode = IB_WR_SEND;
562
563 return ib_post_send(priv->qp, &priv->tx_wr.wr, NULL);
564}
565
566int ipoib_send(struct net_device *dev, struct sk_buff *skb,
567 struct ib_ah *address, u32 dqpn)
568{
569 struct ipoib_dev_priv *priv = ipoib_priv(dev);
570 struct ipoib_tx_buf *tx_req;
571 int hlen, rc;
572 void *phead;
573 unsigned int usable_sge = priv->max_send_sge - !!skb_headlen(skb);
574
575 if (skb_is_gso(skb)) {
576 hlen = skb_tcp_all_headers(skb);
577 phead = skb->data;
578 if (unlikely(!skb_pull(skb, hlen))) {
579 ipoib_warn(priv, "linear data too small\n");
580 ++dev->stats.tx_dropped;
581 ++dev->stats.tx_errors;
582 dev_kfree_skb_any(skb);
583 return -1;
584 }
585 } else {
586 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
587 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
588 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
589 ++dev->stats.tx_dropped;
590 ++dev->stats.tx_errors;
591 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
592 return -1;
593 }
594 phead = NULL;
595 hlen = 0;
596 }
597 if (skb_shinfo(skb)->nr_frags > usable_sge) {
598 if (skb_linearize(skb) < 0) {
599 ipoib_warn(priv, "skb could not be linearized\n");
600 ++dev->stats.tx_dropped;
601 ++dev->stats.tx_errors;
602 dev_kfree_skb_any(skb);
603 return -1;
604 }
605 /* Does skb_linearize return ok without reducing nr_frags? */
606 if (skb_shinfo(skb)->nr_frags > usable_sge) {
607 ipoib_warn(priv, "too many frags after skb linearize\n");
608 ++dev->stats.tx_dropped;
609 ++dev->stats.tx_errors;
610 dev_kfree_skb_any(skb);
611 return -1;
612 }
613 }
614
615 ipoib_dbg_data(priv,
616 "sending packet, length=%d address=%p dqpn=0x%06x\n",
617 skb->len, address, dqpn);
618
619 /*
620 * We put the skb into the tx_ring _before_ we call post_send()
621 * because it's entirely possible that the completion handler will
622 * run before we execute anything after the post_send(). That
623 * means we have to make sure everything is properly recorded and
624 * our state is consistent before we call post_send().
625 */
626 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
627 tx_req->skb = skb;
628 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
629 ++dev->stats.tx_errors;
630 dev_kfree_skb_any(skb);
631 return -1;
632 }
633
634 if (skb->ip_summed == CHECKSUM_PARTIAL)
635 priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM;
636 else
637 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
638 /* increase the tx_head after send success, but use it for queue state */
639 if ((priv->global_tx_head - priv->global_tx_tail) ==
640 ipoib_sendq_size - 1) {
641 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
642 netif_stop_queue(dev);
643 }
644
645 skb_orphan(skb);
646 skb_dst_drop(skb);
647
648 if (netif_queue_stopped(dev))
649 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
650 IB_CQ_REPORT_MISSED_EVENTS) < 0)
651 ipoib_warn(priv, "request notify on send CQ failed\n");
652
653 rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
654 address, dqpn, tx_req, phead, hlen);
655 if (unlikely(rc)) {
656 ipoib_warn(priv, "post_send failed, error %d\n", rc);
657 ++dev->stats.tx_errors;
658 ipoib_dma_unmap_tx(priv, tx_req);
659 dev_kfree_skb_any(skb);
660 if (netif_queue_stopped(dev))
661 netif_wake_queue(dev);
662 rc = 0;
663 } else {
664 netif_trans_update(dev);
665
666 rc = priv->tx_head;
667 ++priv->tx_head;
668 ++priv->global_tx_head;
669 }
670 return rc;
671}
672
673static void ipoib_reap_dead_ahs(struct ipoib_dev_priv *priv)
674{
675 struct ipoib_ah *ah, *tah;
676 unsigned long flags;
677
678 netif_tx_lock_bh(priv->dev);
679 spin_lock_irqsave(&priv->lock, flags);
680
681 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
682 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
683 list_del(&ah->list);
684 rdma_destroy_ah(ah->ah, 0);
685 kfree(ah);
686 }
687
688 spin_unlock_irqrestore(&priv->lock, flags);
689 netif_tx_unlock_bh(priv->dev);
690}
691
692void ipoib_reap_ah(struct work_struct *work)
693{
694 struct ipoib_dev_priv *priv =
695 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
696
697 ipoib_reap_dead_ahs(priv);
698
699 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
700 queue_delayed_work(priv->wq, &priv->ah_reap_task,
701 round_jiffies_relative(HZ));
702}
703
704static void ipoib_start_ah_reaper(struct ipoib_dev_priv *priv)
705{
706 clear_bit(IPOIB_STOP_REAPER, &priv->flags);
707 queue_delayed_work(priv->wq, &priv->ah_reap_task,
708 round_jiffies_relative(HZ));
709}
710
711static void ipoib_stop_ah_reaper(struct ipoib_dev_priv *priv)
712{
713 set_bit(IPOIB_STOP_REAPER, &priv->flags);
714 cancel_delayed_work(&priv->ah_reap_task);
715 /*
716 * After ipoib_stop_ah_reaper() we always go through
717 * ipoib_reap_dead_ahs() which ensures the work is really stopped and
718 * does a final flush out of the dead_ah's list
719 */
720}
721
722static int recvs_pending(struct net_device *dev)
723{
724 struct ipoib_dev_priv *priv = ipoib_priv(dev);
725 int pending = 0;
726 int i;
727
728 for (i = 0; i < ipoib_recvq_size; ++i)
729 if (priv->rx_ring[i].skb)
730 ++pending;
731
732 return pending;
733}
734
735static void check_qp_movement_and_print(struct ipoib_dev_priv *priv,
736 struct ib_qp *qp,
737 enum ib_qp_state new_state)
738{
739 struct ib_qp_attr qp_attr;
740 struct ib_qp_init_attr query_init_attr;
741 int ret;
742
743 ret = ib_query_qp(qp, &qp_attr, IB_QP_STATE, &query_init_attr);
744 if (ret) {
745 ipoib_warn(priv, "%s: Failed to query QP\n", __func__);
746 return;
747 }
748 /* print according to the new-state and the previous state.*/
749 if (new_state == IB_QPS_ERR && qp_attr.qp_state == IB_QPS_RESET)
750 ipoib_dbg(priv, "Failed modify QP, IB_QPS_RESET to IB_QPS_ERR, acceptable\n");
751 else
752 ipoib_warn(priv, "Failed to modify QP to state: %d from state: %d\n",
753 new_state, qp_attr.qp_state);
754}
755
756static void ipoib_napi_enable(struct net_device *dev)
757{
758 struct ipoib_dev_priv *priv = ipoib_priv(dev);
759
760 napi_enable(&priv->recv_napi);
761 napi_enable(&priv->send_napi);
762}
763
764static void ipoib_napi_disable(struct net_device *dev)
765{
766 struct ipoib_dev_priv *priv = ipoib_priv(dev);
767
768 napi_disable(&priv->recv_napi);
769 napi_disable(&priv->send_napi);
770}
771
772int ipoib_ib_dev_stop_default(struct net_device *dev)
773{
774 struct ipoib_dev_priv *priv = ipoib_priv(dev);
775 struct ib_qp_attr qp_attr;
776 unsigned long begin;
777 struct ipoib_tx_buf *tx_req;
778 int i;
779
780 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
781 ipoib_napi_disable(dev);
782
783 ipoib_cm_dev_stop(dev);
784
785 /*
786 * Move our QP to the error state and then reinitialize in
787 * when all work requests have completed or have been flushed.
788 */
789 qp_attr.qp_state = IB_QPS_ERR;
790 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
791 check_qp_movement_and_print(priv, priv->qp, IB_QPS_ERR);
792
793 /* Wait for all sends and receives to complete */
794 begin = jiffies;
795
796 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
797 if (time_after(jiffies, begin + 5 * HZ)) {
798 ipoib_warn(priv,
799 "timing out; %d sends %d receives not completed\n",
800 priv->tx_head - priv->tx_tail,
801 recvs_pending(dev));
802
803 /*
804 * assume the HW is wedged and just free up
805 * all our pending work requests.
806 */
807 while ((int)priv->tx_tail - (int)priv->tx_head < 0) {
808 tx_req = &priv->tx_ring[priv->tx_tail &
809 (ipoib_sendq_size - 1)];
810 ipoib_dma_unmap_tx(priv, tx_req);
811 dev_kfree_skb_any(tx_req->skb);
812 ++priv->tx_tail;
813 ++priv->global_tx_tail;
814 }
815
816 for (i = 0; i < ipoib_recvq_size; ++i) {
817 struct ipoib_rx_buf *rx_req;
818
819 rx_req = &priv->rx_ring[i];
820 if (!rx_req->skb)
821 continue;
822 ipoib_ud_dma_unmap_rx(priv,
823 priv->rx_ring[i].mapping);
824 dev_kfree_skb_any(rx_req->skb);
825 rx_req->skb = NULL;
826 }
827
828 goto timeout;
829 }
830
831 ipoib_drain_cq(dev);
832
833 usleep_range(1000, 2000);
834 }
835
836 ipoib_dbg(priv, "All sends and receives done.\n");
837
838timeout:
839 qp_attr.qp_state = IB_QPS_RESET;
840 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
841 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
842
843 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
844
845 return 0;
846}
847
848int ipoib_ib_dev_open_default(struct net_device *dev)
849{
850 struct ipoib_dev_priv *priv = ipoib_priv(dev);
851 int ret;
852
853 ret = ipoib_init_qp(dev);
854 if (ret) {
855 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
856 return -1;
857 }
858
859 ret = ipoib_ib_post_receives(dev);
860 if (ret) {
861 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
862 goto out;
863 }
864
865 ret = ipoib_cm_dev_open(dev);
866 if (ret) {
867 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
868 goto out;
869 }
870
871 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
872 ipoib_napi_enable(dev);
873
874 return 0;
875out:
876 return -1;
877}
878
879int ipoib_ib_dev_open(struct net_device *dev)
880{
881 struct ipoib_dev_priv *priv = ipoib_priv(dev);
882
883 ipoib_pkey_dev_check_presence(dev);
884
885 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
886 ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey,
887 (!(priv->pkey & 0x7fff) ? "Invalid" : "not found"));
888 return -1;
889 }
890
891 ipoib_start_ah_reaper(priv);
892 if (priv->rn_ops->ndo_open(dev)) {
893 pr_warn("%s: Failed to open dev\n", dev->name);
894 goto dev_stop;
895 }
896
897 set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
898
899 return 0;
900
901dev_stop:
902 ipoib_stop_ah_reaper(priv);
903 return -1;
904}
905
906void ipoib_ib_dev_stop(struct net_device *dev)
907{
908 struct ipoib_dev_priv *priv = ipoib_priv(dev);
909
910 priv->rn_ops->ndo_stop(dev);
911
912 clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
913 ipoib_stop_ah_reaper(priv);
914}
915
916void ipoib_pkey_dev_check_presence(struct net_device *dev)
917{
918 struct ipoib_dev_priv *priv = ipoib_priv(dev);
919 struct rdma_netdev *rn = netdev_priv(dev);
920
921 if (!(priv->pkey & 0x7fff) ||
922 ib_find_pkey(priv->ca, priv->port, priv->pkey,
923 &priv->pkey_index)) {
924 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
925 } else {
926 if (rn->set_id)
927 rn->set_id(dev, priv->pkey_index);
928 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
929 }
930}
931
932void ipoib_ib_dev_up(struct net_device *dev)
933{
934 struct ipoib_dev_priv *priv = ipoib_priv(dev);
935
936 ipoib_pkey_dev_check_presence(dev);
937
938 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
939 ipoib_dbg(priv, "PKEY is not assigned.\n");
940 return;
941 }
942
943 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
944
945 ipoib_mcast_start_thread(dev);
946}
947
948void ipoib_ib_dev_down(struct net_device *dev)
949{
950 struct ipoib_dev_priv *priv = ipoib_priv(dev);
951
952 ipoib_dbg(priv, "downing ib_dev\n");
953
954 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
955 netif_carrier_off(dev);
956
957 ipoib_mcast_stop_thread(dev);
958 ipoib_mcast_dev_flush(dev);
959
960 ipoib_flush_paths(dev);
961}
962
963void ipoib_drain_cq(struct net_device *dev)
964{
965 struct ipoib_dev_priv *priv = ipoib_priv(dev);
966 int i, n;
967
968 /*
969 * We call completion handling routines that expect to be
970 * called from the BH-disabled NAPI poll context, so disable
971 * BHs here too.
972 */
973 local_bh_disable();
974
975 do {
976 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
977 for (i = 0; i < n; ++i) {
978 /*
979 * Convert any successful completions to flush
980 * errors to avoid passing packets up the
981 * stack after bringing the device down.
982 */
983 if (priv->ibwc[i].status == IB_WC_SUCCESS)
984 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
985
986 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
987 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
988 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
989 else
990 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
991 } else {
992 pr_warn("%s: Got unexpected wqe id\n", __func__);
993 }
994 }
995 } while (n == IPOIB_NUM_WC);
996
997 while (poll_tx(priv))
998 ; /* nothing */
999
1000 local_bh_enable();
1001}
1002
1003/*
1004 * Takes whatever value which is in pkey index 0 and updates priv->pkey
1005 * returns 0 if the pkey value was changed.
1006 */
1007static inline int update_parent_pkey(struct ipoib_dev_priv *priv)
1008{
1009 int result;
1010 u16 prev_pkey;
1011
1012 prev_pkey = priv->pkey;
1013 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
1014 if (result) {
1015 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n",
1016 priv->port, result);
1017 return result;
1018 }
1019
1020 priv->pkey |= 0x8000;
1021
1022 if (prev_pkey != priv->pkey) {
1023 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n",
1024 prev_pkey, priv->pkey);
1025 /*
1026 * Update the pkey in the broadcast address, while making sure to set
1027 * the full membership bit, so that we join the right broadcast group.
1028 */
1029 priv->dev->broadcast[8] = priv->pkey >> 8;
1030 priv->dev->broadcast[9] = priv->pkey & 0xff;
1031 return 0;
1032 }
1033
1034 return 1;
1035}
1036/*
1037 * returns 0 if pkey value was found in a different slot.
1038 */
1039static inline int update_child_pkey(struct ipoib_dev_priv *priv)
1040{
1041 u16 old_index = priv->pkey_index;
1042
1043 priv->pkey_index = 0;
1044 ipoib_pkey_dev_check_presence(priv->dev);
1045
1046 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
1047 (old_index == priv->pkey_index))
1048 return 1;
1049 return 0;
1050}
1051
1052/*
1053 * returns true if the device address of the ipoib interface has changed and the
1054 * new address is a valid one (i.e in the gid table), return false otherwise.
1055 */
1056static bool ipoib_dev_addr_changed_valid(struct ipoib_dev_priv *priv)
1057{
1058 union ib_gid search_gid;
1059 union ib_gid gid0;
1060 int err;
1061 u16 index;
1062 u32 port;
1063 bool ret = false;
1064
1065 if (rdma_query_gid(priv->ca, priv->port, 0, &gid0))
1066 return false;
1067
1068 netif_addr_lock_bh(priv->dev);
1069
1070 /* The subnet prefix may have changed, update it now so we won't have
1071 * to do it later
1072 */
1073 priv->local_gid.global.subnet_prefix = gid0.global.subnet_prefix;
1074 dev_addr_mod(priv->dev, 4, (u8 *)&gid0.global.subnet_prefix,
1075 sizeof(gid0.global.subnet_prefix));
1076 search_gid.global.subnet_prefix = gid0.global.subnet_prefix;
1077
1078 search_gid.global.interface_id = priv->local_gid.global.interface_id;
1079
1080 netif_addr_unlock_bh(priv->dev);
1081
1082 err = ib_find_gid(priv->ca, &search_gid, &port, &index);
1083
1084 netif_addr_lock_bh(priv->dev);
1085
1086 if (search_gid.global.interface_id !=
1087 priv->local_gid.global.interface_id)
1088 /* There was a change while we were looking up the gid, bail
1089 * here and let the next work sort this out
1090 */
1091 goto out;
1092
1093 /* The next section of code needs some background:
1094 * Per IB spec the port GUID can't change if the HCA is powered on.
1095 * port GUID is the basis for GID at index 0 which is the basis for
1096 * the default device address of a ipoib interface.
1097 *
1098 * so it seems the flow should be:
1099 * if user_changed_dev_addr && gid in gid tbl
1100 * set bit dev_addr_set
1101 * return true
1102 * else
1103 * return false
1104 *
1105 * The issue is that there are devices that don't follow the spec,
1106 * they change the port GUID when the HCA is powered, so in order
1107 * not to break userspace applications, We need to check if the
1108 * user wanted to control the device address and we assume that
1109 * if he sets the device address back to be based on GID index 0,
1110 * he no longer wishs to control it.
1111 *
1112 * If the user doesn't control the device address,
1113 * IPOIB_FLAG_DEV_ADDR_SET is set and ib_find_gid failed it means
1114 * the port GUID has changed and GID at index 0 has changed
1115 * so we need to change priv->local_gid and priv->dev->dev_addr
1116 * to reflect the new GID.
1117 */
1118 if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
1119 if (!err && port == priv->port) {
1120 set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1121 if (index == 0)
1122 clear_bit(IPOIB_FLAG_DEV_ADDR_CTRL,
1123 &priv->flags);
1124 else
1125 set_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags);
1126 ret = true;
1127 } else {
1128 ret = false;
1129 }
1130 } else {
1131 if (!err && port == priv->port) {
1132 ret = true;
1133 } else {
1134 if (!test_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags)) {
1135 memcpy(&priv->local_gid, &gid0,
1136 sizeof(priv->local_gid));
1137 dev_addr_mod(priv->dev, 4, (u8 *)&gid0,
1138 sizeof(priv->local_gid));
1139 ret = true;
1140 }
1141 }
1142 }
1143
1144out:
1145 netif_addr_unlock_bh(priv->dev);
1146
1147 return ret;
1148}
1149
1150static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
1151 enum ipoib_flush_level level,
1152 int nesting)
1153{
1154 struct ipoib_dev_priv *cpriv;
1155 struct net_device *dev = priv->dev;
1156 int result;
1157
1158 down_read_nested(&priv->vlan_rwsem, nesting);
1159
1160 /*
1161 * Flush any child interfaces too -- they might be up even if
1162 * the parent is down.
1163 */
1164 list_for_each_entry(cpriv, &priv->child_intfs, list)
1165 __ipoib_ib_dev_flush(cpriv, level, nesting + 1);
1166
1167 up_read(&priv->vlan_rwsem);
1168
1169 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) &&
1170 level != IPOIB_FLUSH_HEAVY) {
1171 /* Make sure the dev_addr is set even if not flushing */
1172 if (level == IPOIB_FLUSH_LIGHT)
1173 ipoib_dev_addr_changed_valid(priv);
1174 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
1175 return;
1176 }
1177
1178 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1179 /* interface is down. update pkey and leave. */
1180 if (level == IPOIB_FLUSH_HEAVY) {
1181 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1182 update_parent_pkey(priv);
1183 else
1184 update_child_pkey(priv);
1185 } else if (level == IPOIB_FLUSH_LIGHT)
1186 ipoib_dev_addr_changed_valid(priv);
1187 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
1188 return;
1189 }
1190
1191 if (level == IPOIB_FLUSH_HEAVY) {
1192 /* child devices chase their origin pkey value, while non-child
1193 * (parent) devices should always takes what present in pkey index 0
1194 */
1195 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
1196 result = update_child_pkey(priv);
1197 if (result) {
1198 /* restart QP only if P_Key index is changed */
1199 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
1200 return;
1201 }
1202
1203 } else {
1204 result = update_parent_pkey(priv);
1205 /* restart QP only if P_Key value changed */
1206 if (result) {
1207 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n");
1208 return;
1209 }
1210 }
1211 }
1212
1213 if (level == IPOIB_FLUSH_LIGHT) {
1214 int oper_up;
1215 ipoib_mark_paths_invalid(dev);
1216 /* Set IPoIB operation as down to prevent races between:
1217 * the flush flow which leaves MCG and on the fly joins
1218 * which can happen during that time. mcast restart task
1219 * should deal with join requests we missed.
1220 */
1221 oper_up = test_and_clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
1222 ipoib_mcast_dev_flush(dev);
1223 if (oper_up)
1224 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
1225 ipoib_reap_dead_ahs(priv);
1226 }
1227
1228 if (level >= IPOIB_FLUSH_NORMAL)
1229 ipoib_ib_dev_down(dev);
1230
1231 if (level == IPOIB_FLUSH_HEAVY) {
1232 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
1233 ipoib_ib_dev_stop(dev);
1234
1235 if (ipoib_ib_dev_open(dev))
1236 return;
1237
1238 if (netif_queue_stopped(dev))
1239 netif_start_queue(dev);
1240 }
1241
1242 /*
1243 * The device could have been brought down between the start and when
1244 * we get here, don't bring it back up if it's not configured up
1245 */
1246 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1247 if (level >= IPOIB_FLUSH_NORMAL)
1248 ipoib_ib_dev_up(dev);
1249 if (ipoib_dev_addr_changed_valid(priv))
1250 ipoib_mcast_restart_task(&priv->restart_task);
1251 }
1252}
1253
1254void ipoib_ib_dev_flush_light(struct work_struct *work)
1255{
1256 struct ipoib_dev_priv *priv =
1257 container_of(work, struct ipoib_dev_priv, flush_light);
1258
1259 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0);
1260}
1261
1262void ipoib_ib_dev_flush_normal(struct work_struct *work)
1263{
1264 struct ipoib_dev_priv *priv =
1265 container_of(work, struct ipoib_dev_priv, flush_normal);
1266
1267 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0);
1268}
1269
1270void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1271{
1272 struct ipoib_dev_priv *priv =
1273 container_of(work, struct ipoib_dev_priv, flush_heavy);
1274
1275 rtnl_lock();
1276 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0);
1277 rtnl_unlock();
1278}
1279
1280void ipoib_ib_dev_cleanup(struct net_device *dev)
1281{
1282 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1283
1284 ipoib_dbg(priv, "cleaning up ib_dev\n");
1285 /*
1286 * We must make sure there are no more (path) completions
1287 * that may wish to touch priv fields that are no longer valid
1288 */
1289 ipoib_flush_paths(dev);
1290
1291 ipoib_mcast_stop_thread(dev);
1292 ipoib_mcast_dev_flush(dev);
1293
1294 /*
1295 * All of our ah references aren't free until after
1296 * ipoib_mcast_dev_flush(), ipoib_flush_paths, and
1297 * the neighbor garbage collection is stopped and reaped.
1298 * That should all be done now, so make a final ah flush.
1299 */
1300 ipoib_reap_dead_ahs(priv);
1301
1302 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
1303
1304 priv->rn_ops->ndo_uninit(dev);
1305
1306 if (priv->pd) {
1307 ib_dealloc_pd(priv->pd);
1308 priv->pd = NULL;
1309 }
1310}
1311