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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
411 if (unlikely(netif_queue_stopped(dev) &&
412 ((priv->tx_head - priv->tx_tail) <= ipoib_sendq_size >> 1) &&
413 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)))
414 netif_wake_queue(dev);
415
416 if (wc->status != IB_WC_SUCCESS &&
417 wc->status != IB_WC_WR_FLUSH_ERR) {
418 struct ipoib_qp_state_validate *qp_work;
419 ipoib_warn(priv,
420 "failed send event (status=%d, wrid=%d vend_err %#x)\n",
421 wc->status, wr_id, wc->vendor_err);
422 qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC);
423 if (!qp_work)
424 return;
425
426 INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work);
427 qp_work->priv = priv;
428 queue_work(priv->wq, &qp_work->work);
429 }
430}
431
432static int poll_tx(struct ipoib_dev_priv *priv)
433{
434 int n, i;
435 struct ib_wc *wc;
436
437 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
438 for (i = 0; i < n; ++i) {
439 wc = priv->send_wc + i;
440 if (wc->wr_id & IPOIB_OP_CM)
441 ipoib_cm_handle_tx_wc(priv->dev, priv->send_wc + i);
442 else
443 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
444 }
445 return n == MAX_SEND_CQE;
446}
447
448int ipoib_rx_poll(struct napi_struct *napi, int budget)
449{
450 struct ipoib_dev_priv *priv =
451 container_of(napi, struct ipoib_dev_priv, recv_napi);
452 struct net_device *dev = priv->dev;
453 int done;
454 int t;
455 int n, i;
456
457 done = 0;
458
459poll_more:
460 while (done < budget) {
461 int max = (budget - done);
462
463 t = min(IPOIB_NUM_WC, max);
464 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
465
466 for (i = 0; i < n; i++) {
467 struct ib_wc *wc = priv->ibwc + i;
468
469 if (wc->wr_id & IPOIB_OP_RECV) {
470 ++done;
471 if (wc->wr_id & IPOIB_OP_CM)
472 ipoib_cm_handle_rx_wc(dev, wc);
473 else
474 ipoib_ib_handle_rx_wc(dev, wc);
475 } else {
476 pr_warn("%s: Got unexpected wqe id\n", __func__);
477 }
478 }
479
480 if (n != t)
481 break;
482 }
483
484 if (done < budget) {
485 napi_complete(napi);
486 if (unlikely(ib_req_notify_cq(priv->recv_cq,
487 IB_CQ_NEXT_COMP |
488 IB_CQ_REPORT_MISSED_EVENTS)) &&
489 napi_reschedule(napi))
490 goto poll_more;
491 }
492
493 return done;
494}
495
496int ipoib_tx_poll(struct napi_struct *napi, int budget)
497{
498 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv,
499 send_napi);
500 struct net_device *dev = priv->dev;
501 int n, i;
502 struct ib_wc *wc;
503
504poll_more:
505 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
506
507 for (i = 0; i < n; i++) {
508 wc = priv->send_wc + i;
509 if (wc->wr_id & IPOIB_OP_CM)
510 ipoib_cm_handle_tx_wc(dev, wc);
511 else
512 ipoib_ib_handle_tx_wc(dev, wc);
513 }
514
515 if (n < budget) {
516 napi_complete(napi);
517 if (unlikely(ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
518 IB_CQ_REPORT_MISSED_EVENTS)) &&
519 napi_reschedule(napi))
520 goto poll_more;
521 }
522 return n < 0 ? 0 : n;
523}
524
525void ipoib_ib_rx_completion(struct ib_cq *cq, void *ctx_ptr)
526{
527 struct ipoib_dev_priv *priv = ctx_ptr;
528
529 napi_schedule(&priv->recv_napi);
530}
531
532void ipoib_ib_tx_completion(struct ib_cq *cq, void *ctx_ptr)
533{
534 struct ipoib_dev_priv *priv = ctx_ptr;
535
536 napi_schedule(&priv->send_napi);
537}
538
539static inline int post_send(struct ipoib_dev_priv *priv,
540 unsigned int wr_id,
541 struct ib_ah *address, u32 dqpn,
542 struct ipoib_tx_buf *tx_req,
543 void *head, int hlen)
544{
545 struct sk_buff *skb = tx_req->skb;
546
547 ipoib_build_sge(priv, tx_req);
548
549 priv->tx_wr.wr.wr_id = wr_id;
550 priv->tx_wr.remote_qpn = dqpn;
551 priv->tx_wr.ah = address;
552
553 if (head) {
554 priv->tx_wr.mss = skb_shinfo(skb)->gso_size;
555 priv->tx_wr.header = head;
556 priv->tx_wr.hlen = hlen;
557 priv->tx_wr.wr.opcode = IB_WR_LSO;
558 } else
559 priv->tx_wr.wr.opcode = IB_WR_SEND;
560
561 return ib_post_send(priv->qp, &priv->tx_wr.wr, NULL);
562}
563
564int ipoib_send(struct net_device *dev, struct sk_buff *skb,
565 struct ib_ah *address, u32 dqpn)
566{
567 struct ipoib_dev_priv *priv = ipoib_priv(dev);
568 struct ipoib_tx_buf *tx_req;
569 int hlen, rc;
570 void *phead;
571 unsigned int usable_sge = priv->max_send_sge - !!skb_headlen(skb);
572
573 if (skb_is_gso(skb)) {
574 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
575 phead = skb->data;
576 if (unlikely(!skb_pull(skb, hlen))) {
577 ipoib_warn(priv, "linear data too small\n");
578 ++dev->stats.tx_dropped;
579 ++dev->stats.tx_errors;
580 dev_kfree_skb_any(skb);
581 return -1;
582 }
583 } else {
584 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
585 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
586 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
587 ++dev->stats.tx_dropped;
588 ++dev->stats.tx_errors;
589 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
590 return -1;
591 }
592 phead = NULL;
593 hlen = 0;
594 }
595 if (skb_shinfo(skb)->nr_frags > usable_sge) {
596 if (skb_linearize(skb) < 0) {
597 ipoib_warn(priv, "skb could not be linearized\n");
598 ++dev->stats.tx_dropped;
599 ++dev->stats.tx_errors;
600 dev_kfree_skb_any(skb);
601 return -1;
602 }
603 /* Does skb_linearize return ok without reducing nr_frags? */
604 if (skb_shinfo(skb)->nr_frags > usable_sge) {
605 ipoib_warn(priv, "too many frags after skb linearize\n");
606 ++dev->stats.tx_dropped;
607 ++dev->stats.tx_errors;
608 dev_kfree_skb_any(skb);
609 return -1;
610 }
611 }
612
613 ipoib_dbg_data(priv,
614 "sending packet, length=%d address=%p dqpn=0x%06x\n",
615 skb->len, address, dqpn);
616
617 /*
618 * We put the skb into the tx_ring _before_ we call post_send()
619 * because it's entirely possible that the completion handler will
620 * run before we execute anything after the post_send(). That
621 * means we have to make sure everything is properly recorded and
622 * our state is consistent before we call post_send().
623 */
624 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
625 tx_req->skb = skb;
626 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
627 ++dev->stats.tx_errors;
628 dev_kfree_skb_any(skb);
629 return -1;
630 }
631
632 if (skb->ip_summed == CHECKSUM_PARTIAL)
633 priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM;
634 else
635 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
636 /* increase the tx_head after send success, but use it for queue state */
637 if (priv->tx_head - priv->tx_tail == ipoib_sendq_size - 1) {
638 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
639 netif_stop_queue(dev);
640 }
641
642 skb_orphan(skb);
643 skb_dst_drop(skb);
644
645 if (netif_queue_stopped(dev))
646 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
647 IB_CQ_REPORT_MISSED_EVENTS) < 0)
648 ipoib_warn(priv, "request notify on send CQ failed\n");
649
650 rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
651 address, dqpn, tx_req, phead, hlen);
652 if (unlikely(rc)) {
653 ipoib_warn(priv, "post_send failed, error %d\n", rc);
654 ++dev->stats.tx_errors;
655 ipoib_dma_unmap_tx(priv, tx_req);
656 dev_kfree_skb_any(skb);
657 if (netif_queue_stopped(dev))
658 netif_wake_queue(dev);
659 rc = 0;
660 } else {
661 netif_trans_update(dev);
662
663 rc = priv->tx_head;
664 ++priv->tx_head;
665 }
666 return rc;
667}
668
669static void __ipoib_reap_ah(struct net_device *dev)
670{
671 struct ipoib_dev_priv *priv = ipoib_priv(dev);
672 struct ipoib_ah *ah, *tah;
673 unsigned long flags;
674
675 netif_tx_lock_bh(dev);
676 spin_lock_irqsave(&priv->lock, flags);
677
678 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
679 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
680 list_del(&ah->list);
681 rdma_destroy_ah(ah->ah, 0);
682 kfree(ah);
683 }
684
685 spin_unlock_irqrestore(&priv->lock, flags);
686 netif_tx_unlock_bh(dev);
687}
688
689void ipoib_reap_ah(struct work_struct *work)
690{
691 struct ipoib_dev_priv *priv =
692 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
693 struct net_device *dev = priv->dev;
694
695 __ipoib_reap_ah(dev);
696
697 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
698 queue_delayed_work(priv->wq, &priv->ah_reap_task,
699 round_jiffies_relative(HZ));
700}
701
702static void ipoib_flush_ah(struct net_device *dev)
703{
704 struct ipoib_dev_priv *priv = ipoib_priv(dev);
705
706 cancel_delayed_work(&priv->ah_reap_task);
707 flush_workqueue(priv->wq);
708 ipoib_reap_ah(&priv->ah_reap_task.work);
709}
710
711static void ipoib_stop_ah(struct net_device *dev)
712{
713 struct ipoib_dev_priv *priv = ipoib_priv(dev);
714
715 set_bit(IPOIB_STOP_REAPER, &priv->flags);
716 ipoib_flush_ah(dev);
717}
718
719static int recvs_pending(struct net_device *dev)
720{
721 struct ipoib_dev_priv *priv = ipoib_priv(dev);
722 int pending = 0;
723 int i;
724
725 for (i = 0; i < ipoib_recvq_size; ++i)
726 if (priv->rx_ring[i].skb)
727 ++pending;
728
729 return pending;
730}
731
732static void check_qp_movement_and_print(struct ipoib_dev_priv *priv,
733 struct ib_qp *qp,
734 enum ib_qp_state new_state)
735{
736 struct ib_qp_attr qp_attr;
737 struct ib_qp_init_attr query_init_attr;
738 int ret;
739
740 ret = ib_query_qp(qp, &qp_attr, IB_QP_STATE, &query_init_attr);
741 if (ret) {
742 ipoib_warn(priv, "%s: Failed to query QP\n", __func__);
743 return;
744 }
745 /* print according to the new-state and the previous state.*/
746 if (new_state == IB_QPS_ERR && qp_attr.qp_state == IB_QPS_RESET)
747 ipoib_dbg(priv, "Failed modify QP, IB_QPS_RESET to IB_QPS_ERR, acceptable\n");
748 else
749 ipoib_warn(priv, "Failed to modify QP to state: %d from state: %d\n",
750 new_state, qp_attr.qp_state);
751}
752
753static void ipoib_napi_enable(struct net_device *dev)
754{
755 struct ipoib_dev_priv *priv = ipoib_priv(dev);
756
757 napi_enable(&priv->recv_napi);
758 napi_enable(&priv->send_napi);
759}
760
761static void ipoib_napi_disable(struct net_device *dev)
762{
763 struct ipoib_dev_priv *priv = ipoib_priv(dev);
764
765 napi_disable(&priv->recv_napi);
766 napi_disable(&priv->send_napi);
767}
768
769int ipoib_ib_dev_stop_default(struct net_device *dev)
770{
771 struct ipoib_dev_priv *priv = ipoib_priv(dev);
772 struct ib_qp_attr qp_attr;
773 unsigned long begin;
774 struct ipoib_tx_buf *tx_req;
775 int i;
776
777 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
778 ipoib_napi_disable(dev);
779
780 ipoib_cm_dev_stop(dev);
781
782 /*
783 * Move our QP to the error state and then reinitialize in
784 * when all work requests have completed or have been flushed.
785 */
786 qp_attr.qp_state = IB_QPS_ERR;
787 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
788 check_qp_movement_and_print(priv, priv->qp, IB_QPS_ERR);
789
790 /* Wait for all sends and receives to complete */
791 begin = jiffies;
792
793 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
794 if (time_after(jiffies, begin + 5 * HZ)) {
795 ipoib_warn(priv,
796 "timing out; %d sends %d receives not completed\n",
797 priv->tx_head - priv->tx_tail,
798 recvs_pending(dev));
799
800 /*
801 * assume the HW is wedged and just free up
802 * all our pending work requests.
803 */
804 while ((int)priv->tx_tail - (int)priv->tx_head < 0) {
805 tx_req = &priv->tx_ring[priv->tx_tail &
806 (ipoib_sendq_size - 1)];
807 ipoib_dma_unmap_tx(priv, tx_req);
808 dev_kfree_skb_any(tx_req->skb);
809 ++priv->tx_tail;
810 }
811
812 for (i = 0; i < ipoib_recvq_size; ++i) {
813 struct ipoib_rx_buf *rx_req;
814
815 rx_req = &priv->rx_ring[i];
816 if (!rx_req->skb)
817 continue;
818 ipoib_ud_dma_unmap_rx(priv,
819 priv->rx_ring[i].mapping);
820 dev_kfree_skb_any(rx_req->skb);
821 rx_req->skb = NULL;
822 }
823
824 goto timeout;
825 }
826
827 ipoib_drain_cq(dev);
828
829 usleep_range(1000, 2000);
830 }
831
832 ipoib_dbg(priv, "All sends and receives done.\n");
833
834timeout:
835 qp_attr.qp_state = IB_QPS_RESET;
836 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
837 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
838
839 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
840
841 return 0;
842}
843
844int ipoib_ib_dev_stop(struct net_device *dev)
845{
846 struct ipoib_dev_priv *priv = ipoib_priv(dev);
847
848 priv->rn_ops->ndo_stop(dev);
849
850 clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
851 ipoib_flush_ah(dev);
852
853 return 0;
854}
855
856int ipoib_ib_dev_open_default(struct net_device *dev)
857{
858 struct ipoib_dev_priv *priv = ipoib_priv(dev);
859 int ret;
860
861 ret = ipoib_init_qp(dev);
862 if (ret) {
863 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
864 return -1;
865 }
866
867 ret = ipoib_ib_post_receives(dev);
868 if (ret) {
869 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
870 goto out;
871 }
872
873 ret = ipoib_cm_dev_open(dev);
874 if (ret) {
875 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
876 goto out;
877 }
878
879 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
880 ipoib_napi_enable(dev);
881
882 return 0;
883out:
884 return -1;
885}
886
887int ipoib_ib_dev_open(struct net_device *dev)
888{
889 struct ipoib_dev_priv *priv = ipoib_priv(dev);
890
891 ipoib_pkey_dev_check_presence(dev);
892
893 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
894 ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey,
895 (!(priv->pkey & 0x7fff) ? "Invalid" : "not found"));
896 return -1;
897 }
898
899 clear_bit(IPOIB_STOP_REAPER, &priv->flags);
900 queue_delayed_work(priv->wq, &priv->ah_reap_task,
901 round_jiffies_relative(HZ));
902
903 if (priv->rn_ops->ndo_open(dev)) {
904 pr_warn("%s: Failed to open dev\n", dev->name);
905 goto dev_stop;
906 }
907
908 set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
909
910 return 0;
911
912dev_stop:
913 set_bit(IPOIB_STOP_REAPER, &priv->flags);
914 cancel_delayed_work(&priv->ah_reap_task);
915 set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
916 ipoib_ib_dev_stop(dev);
917 return -1;
918}
919
920void ipoib_pkey_dev_check_presence(struct net_device *dev)
921{
922 struct ipoib_dev_priv *priv = ipoib_priv(dev);
923 struct rdma_netdev *rn = netdev_priv(dev);
924
925 if (!(priv->pkey & 0x7fff) ||
926 ib_find_pkey(priv->ca, priv->port, priv->pkey,
927 &priv->pkey_index)) {
928 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
929 } else {
930 if (rn->set_id)
931 rn->set_id(dev, priv->pkey_index);
932 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
933 }
934}
935
936void ipoib_ib_dev_up(struct net_device *dev)
937{
938 struct ipoib_dev_priv *priv = ipoib_priv(dev);
939
940 ipoib_pkey_dev_check_presence(dev);
941
942 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
943 ipoib_dbg(priv, "PKEY is not assigned.\n");
944 return;
945 }
946
947 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
948
949 ipoib_mcast_start_thread(dev);
950}
951
952void ipoib_ib_dev_down(struct net_device *dev)
953{
954 struct ipoib_dev_priv *priv = ipoib_priv(dev);
955
956 ipoib_dbg(priv, "downing ib_dev\n");
957
958 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
959 netif_carrier_off(dev);
960
961 ipoib_mcast_stop_thread(dev);
962 ipoib_mcast_dev_flush(dev);
963
964 ipoib_flush_paths(dev);
965}
966
967void ipoib_drain_cq(struct net_device *dev)
968{
969 struct ipoib_dev_priv *priv = ipoib_priv(dev);
970 int i, n;
971
972 /*
973 * We call completion handling routines that expect to be
974 * called from the BH-disabled NAPI poll context, so disable
975 * BHs here too.
976 */
977 local_bh_disable();
978
979 do {
980 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
981 for (i = 0; i < n; ++i) {
982 /*
983 * Convert any successful completions to flush
984 * errors to avoid passing packets up the
985 * stack after bringing the device down.
986 */
987 if (priv->ibwc[i].status == IB_WC_SUCCESS)
988 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
989
990 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
991 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
992 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
993 else
994 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
995 } else {
996 pr_warn("%s: Got unexpected wqe id\n", __func__);
997 }
998 }
999 } while (n == IPOIB_NUM_WC);
1000
1001 while (poll_tx(priv))
1002 ; /* nothing */
1003
1004 local_bh_enable();
1005}
1006
1007/*
1008 * Takes whatever value which is in pkey index 0 and updates priv->pkey
1009 * returns 0 if the pkey value was changed.
1010 */
1011static inline int update_parent_pkey(struct ipoib_dev_priv *priv)
1012{
1013 int result;
1014 u16 prev_pkey;
1015
1016 prev_pkey = priv->pkey;
1017 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
1018 if (result) {
1019 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n",
1020 priv->port, result);
1021 return result;
1022 }
1023
1024 priv->pkey |= 0x8000;
1025
1026 if (prev_pkey != priv->pkey) {
1027 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n",
1028 prev_pkey, priv->pkey);
1029 /*
1030 * Update the pkey in the broadcast address, while making sure to set
1031 * the full membership bit, so that we join the right broadcast group.
1032 */
1033 priv->dev->broadcast[8] = priv->pkey >> 8;
1034 priv->dev->broadcast[9] = priv->pkey & 0xff;
1035 return 0;
1036 }
1037
1038 return 1;
1039}
1040/*
1041 * returns 0 if pkey value was found in a different slot.
1042 */
1043static inline int update_child_pkey(struct ipoib_dev_priv *priv)
1044{
1045 u16 old_index = priv->pkey_index;
1046
1047 priv->pkey_index = 0;
1048 ipoib_pkey_dev_check_presence(priv->dev);
1049
1050 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
1051 (old_index == priv->pkey_index))
1052 return 1;
1053 return 0;
1054}
1055
1056/*
1057 * returns true if the device address of the ipoib interface has changed and the
1058 * new address is a valid one (i.e in the gid table), return false otherwise.
1059 */
1060static bool ipoib_dev_addr_changed_valid(struct ipoib_dev_priv *priv)
1061{
1062 union ib_gid search_gid;
1063 union ib_gid gid0;
1064 union ib_gid *netdev_gid;
1065 int err;
1066 u16 index;
1067 u8 port;
1068 bool ret = false;
1069
1070 netdev_gid = (union ib_gid *)(priv->dev->dev_addr + 4);
1071 if (rdma_query_gid(priv->ca, priv->port, 0, &gid0))
1072 return false;
1073
1074 netif_addr_lock_bh(priv->dev);
1075
1076 /* The subnet prefix may have changed, update it now so we won't have
1077 * to do it later
1078 */
1079 priv->local_gid.global.subnet_prefix = gid0.global.subnet_prefix;
1080 netdev_gid->global.subnet_prefix = gid0.global.subnet_prefix;
1081 search_gid.global.subnet_prefix = gid0.global.subnet_prefix;
1082
1083 search_gid.global.interface_id = priv->local_gid.global.interface_id;
1084
1085 netif_addr_unlock_bh(priv->dev);
1086
1087 err = ib_find_gid(priv->ca, &search_gid, &port, &index);
1088
1089 netif_addr_lock_bh(priv->dev);
1090
1091 if (search_gid.global.interface_id !=
1092 priv->local_gid.global.interface_id)
1093 /* There was a change while we were looking up the gid, bail
1094 * here and let the next work sort this out
1095 */
1096 goto out;
1097
1098 /* The next section of code needs some background:
1099 * Per IB spec the port GUID can't change if the HCA is powered on.
1100 * port GUID is the basis for GID at index 0 which is the basis for
1101 * the default device address of a ipoib interface.
1102 *
1103 * so it seems the flow should be:
1104 * if user_changed_dev_addr && gid in gid tbl
1105 * set bit dev_addr_set
1106 * return true
1107 * else
1108 * return false
1109 *
1110 * The issue is that there are devices that don't follow the spec,
1111 * they change the port GUID when the HCA is powered, so in order
1112 * not to break userspace applications, We need to check if the
1113 * user wanted to control the device address and we assume that
1114 * if he sets the device address back to be based on GID index 0,
1115 * he no longer wishs to control it.
1116 *
1117 * If the user doesn't control the the device address,
1118 * IPOIB_FLAG_DEV_ADDR_SET is set and ib_find_gid failed it means
1119 * the port GUID has changed and GID at index 0 has changed
1120 * so we need to change priv->local_gid and priv->dev->dev_addr
1121 * to reflect the new GID.
1122 */
1123 if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
1124 if (!err && port == priv->port) {
1125 set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1126 if (index == 0)
1127 clear_bit(IPOIB_FLAG_DEV_ADDR_CTRL,
1128 &priv->flags);
1129 else
1130 set_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags);
1131 ret = true;
1132 } else {
1133 ret = false;
1134 }
1135 } else {
1136 if (!err && port == priv->port) {
1137 ret = true;
1138 } else {
1139 if (!test_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags)) {
1140 memcpy(&priv->local_gid, &gid0,
1141 sizeof(priv->local_gid));
1142 memcpy(priv->dev->dev_addr + 4, &gid0,
1143 sizeof(priv->local_gid));
1144 ret = true;
1145 }
1146 }
1147 }
1148
1149out:
1150 netif_addr_unlock_bh(priv->dev);
1151
1152 return ret;
1153}
1154
1155static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
1156 enum ipoib_flush_level level,
1157 int nesting)
1158{
1159 struct ipoib_dev_priv *cpriv;
1160 struct net_device *dev = priv->dev;
1161 int result;
1162
1163 down_read_nested(&priv->vlan_rwsem, nesting);
1164
1165 /*
1166 * Flush any child interfaces too -- they might be up even if
1167 * the parent is down.
1168 */
1169 list_for_each_entry(cpriv, &priv->child_intfs, list)
1170 __ipoib_ib_dev_flush(cpriv, level, nesting + 1);
1171
1172 up_read(&priv->vlan_rwsem);
1173
1174 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) &&
1175 level != IPOIB_FLUSH_HEAVY) {
1176 /* Make sure the dev_addr is set even if not flushing */
1177 if (level == IPOIB_FLUSH_LIGHT)
1178 ipoib_dev_addr_changed_valid(priv);
1179 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
1180 return;
1181 }
1182
1183 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1184 /* interface is down. update pkey and leave. */
1185 if (level == IPOIB_FLUSH_HEAVY) {
1186 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1187 update_parent_pkey(priv);
1188 else
1189 update_child_pkey(priv);
1190 } else if (level == IPOIB_FLUSH_LIGHT)
1191 ipoib_dev_addr_changed_valid(priv);
1192 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
1193 return;
1194 }
1195
1196 if (level == IPOIB_FLUSH_HEAVY) {
1197 /* child devices chase their origin pkey value, while non-child
1198 * (parent) devices should always takes what present in pkey index 0
1199 */
1200 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
1201 result = update_child_pkey(priv);
1202 if (result) {
1203 /* restart QP only if P_Key index is changed */
1204 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
1205 return;
1206 }
1207
1208 } else {
1209 result = update_parent_pkey(priv);
1210 /* restart QP only if P_Key value changed */
1211 if (result) {
1212 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n");
1213 return;
1214 }
1215 }
1216 }
1217
1218 if (level == IPOIB_FLUSH_LIGHT) {
1219 int oper_up;
1220 ipoib_mark_paths_invalid(dev);
1221 /* Set IPoIB operation as down to prevent races between:
1222 * the flush flow which leaves MCG and on the fly joins
1223 * which can happen during that time. mcast restart task
1224 * should deal with join requests we missed.
1225 */
1226 oper_up = test_and_clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
1227 ipoib_mcast_dev_flush(dev);
1228 if (oper_up)
1229 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
1230 ipoib_flush_ah(dev);
1231 }
1232
1233 if (level >= IPOIB_FLUSH_NORMAL)
1234 ipoib_ib_dev_down(dev);
1235
1236 if (level == IPOIB_FLUSH_HEAVY) {
1237 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
1238 ipoib_ib_dev_stop(dev);
1239
1240 if (ipoib_ib_dev_open(dev))
1241 return;
1242
1243 if (netif_queue_stopped(dev))
1244 netif_start_queue(dev);
1245 }
1246
1247 /*
1248 * The device could have been brought down between the start and when
1249 * we get here, don't bring it back up if it's not configured up
1250 */
1251 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1252 if (level >= IPOIB_FLUSH_NORMAL)
1253 ipoib_ib_dev_up(dev);
1254 if (ipoib_dev_addr_changed_valid(priv))
1255 ipoib_mcast_restart_task(&priv->restart_task);
1256 }
1257}
1258
1259void ipoib_ib_dev_flush_light(struct work_struct *work)
1260{
1261 struct ipoib_dev_priv *priv =
1262 container_of(work, struct ipoib_dev_priv, flush_light);
1263
1264 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0);
1265}
1266
1267void ipoib_ib_dev_flush_normal(struct work_struct *work)
1268{
1269 struct ipoib_dev_priv *priv =
1270 container_of(work, struct ipoib_dev_priv, flush_normal);
1271
1272 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0);
1273}
1274
1275void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1276{
1277 struct ipoib_dev_priv *priv =
1278 container_of(work, struct ipoib_dev_priv, flush_heavy);
1279
1280 rtnl_lock();
1281 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0);
1282 rtnl_unlock();
1283}
1284
1285void ipoib_ib_dev_cleanup(struct net_device *dev)
1286{
1287 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1288
1289 ipoib_dbg(priv, "cleaning up ib_dev\n");
1290 /*
1291 * We must make sure there are no more (path) completions
1292 * that may wish to touch priv fields that are no longer valid
1293 */
1294 ipoib_flush_paths(dev);
1295
1296 ipoib_mcast_stop_thread(dev);
1297 ipoib_mcast_dev_flush(dev);
1298
1299 /*
1300 * All of our ah references aren't free until after
1301 * ipoib_mcast_dev_flush(), ipoib_flush_paths, and
1302 * the neighbor garbage collection is stopped and reaped.
1303 * That should all be done now, so make a final ah flush.
1304 */
1305 ipoib_stop_ah(dev);
1306
1307 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
1308
1309 priv->rn_ops->ndo_uninit(dev);
1310
1311 if (priv->pd) {
1312 ib_dealloc_pd(priv->pd);
1313 priv->pd = NULL;
1314 }
1315}
1316