Merge branch 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorri...
[sfrench/cifs-2.6.git] / drivers / infiniband / ulp / ipoib / ipoib_ib.c
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
48 static int data_debug_level;
49
50 module_param(data_debug_level, int, 0644);
51 MODULE_PARM_DESC(data_debug_level,
52                  "Enable data path debug tracing if > 0");
53 #endif
54
55 struct 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
81 void ipoib_free_ah(struct kref *kref)
82 {
83         struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
84         struct ipoib_dev_priv *priv = 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
93 static 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
101 static 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
122 static 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;
149 error:
150         dev_kfree_skb_any(skb);
151         return NULL;
152 }
153
154 static 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
173 static 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
269 repost:
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
275 int 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                                                  frag->page_offset, skb_frag_size(frag),
297                                                  DMA_TO_DEVICE);
298                 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
299                         goto partial_error;
300         }
301         return 0;
302
303 partial_error:
304         for (; i > 0; --i) {
305                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
306
307                 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE);
308         }
309
310         if (off)
311                 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
312
313         return -EIO;
314 }
315
316 void ipoib_dma_unmap_tx(struct ipoib_dev_priv *priv,
317                         struct ipoib_tx_buf *tx_req)
318 {
319         struct sk_buff *skb = tx_req->skb;
320         u64 *mapping = tx_req->mapping;
321         int i;
322         int off;
323
324         if (skb_headlen(skb)) {
325                 ib_dma_unmap_single(priv->ca, mapping[0], skb_headlen(skb),
326                                     DMA_TO_DEVICE);
327                 off = 1;
328         } else
329                 off = 0;
330
331         for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
332                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
333
334                 ib_dma_unmap_page(priv->ca, mapping[i + off],
335                                   skb_frag_size(frag), DMA_TO_DEVICE);
336         }
337 }
338
339 /*
340  * As the result of a completion error the QP Can be transferred to SQE states.
341  * The function checks if the (send)QP is in SQE state and
342  * moves it back to RTS state, that in order to have it functional again.
343  */
344 static void ipoib_qp_state_validate_work(struct work_struct *work)
345 {
346         struct ipoib_qp_state_validate *qp_work =
347                 container_of(work, struct ipoib_qp_state_validate, work);
348
349         struct ipoib_dev_priv *priv = qp_work->priv;
350         struct ib_qp_attr qp_attr;
351         struct ib_qp_init_attr query_init_attr;
352         int ret;
353
354         ret = ib_query_qp(priv->qp, &qp_attr, IB_QP_STATE, &query_init_attr);
355         if (ret) {
356                 ipoib_warn(priv, "%s: Failed to query QP ret: %d\n",
357                            __func__, ret);
358                 goto free_res;
359         }
360         pr_info("%s: QP: 0x%x is in state: %d\n",
361                 __func__, priv->qp->qp_num, qp_attr.qp_state);
362
363         /* currently support only in SQE->RTS transition*/
364         if (qp_attr.qp_state == IB_QPS_SQE) {
365                 qp_attr.qp_state = IB_QPS_RTS;
366
367                 ret = ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE);
368                 if (ret) {
369                         pr_warn("failed(%d) modify QP:0x%x SQE->RTS\n",
370                                 ret, priv->qp->qp_num);
371                         goto free_res;
372                 }
373                 pr_info("%s: QP: 0x%x moved from IB_QPS_SQE to IB_QPS_RTS\n",
374                         __func__, priv->qp->qp_num);
375         } else {
376                 pr_warn("QP (%d) will stay in state: %d\n",
377                         priv->qp->qp_num, qp_attr.qp_state);
378         }
379
380 free_res:
381         kfree(qp_work);
382 }
383
384 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
385 {
386         struct ipoib_dev_priv *priv = ipoib_priv(dev);
387         unsigned int wr_id = wc->wr_id;
388         struct ipoib_tx_buf *tx_req;
389
390         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
391                        wr_id, wc->status);
392
393         if (unlikely(wr_id >= ipoib_sendq_size)) {
394                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
395                            wr_id, ipoib_sendq_size);
396                 return;
397         }
398
399         tx_req = &priv->tx_ring[wr_id];
400
401         ipoib_dma_unmap_tx(priv, tx_req);
402
403         ++dev->stats.tx_packets;
404         dev->stats.tx_bytes += tx_req->skb->len;
405
406         dev_kfree_skb_any(tx_req->skb);
407
408         ++priv->tx_tail;
409
410         if (unlikely(netif_queue_stopped(dev) &&
411                      ((priv->tx_head - priv->tx_tail) <= ipoib_sendq_size >> 1) &&
412                      test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)))
413                 netif_wake_queue(dev);
414
415         if (wc->status != IB_WC_SUCCESS &&
416             wc->status != IB_WC_WR_FLUSH_ERR) {
417                 struct ipoib_qp_state_validate *qp_work;
418                 ipoib_warn(priv,
419                            "failed send event (status=%d, wrid=%d vend_err %#x)\n",
420                            wc->status, wr_id, wc->vendor_err);
421                 qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC);
422                 if (!qp_work)
423                         return;
424
425                 INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work);
426                 qp_work->priv = priv;
427                 queue_work(priv->wq, &qp_work->work);
428         }
429 }
430
431 static int poll_tx(struct ipoib_dev_priv *priv)
432 {
433         int n, i;
434         struct ib_wc *wc;
435
436         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
437         for (i = 0; i < n; ++i) {
438                 wc = priv->send_wc + i;
439                 if (wc->wr_id & IPOIB_OP_CM)
440                         ipoib_cm_handle_tx_wc(priv->dev, priv->send_wc + i);
441                 else
442                         ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
443         }
444         return n == MAX_SEND_CQE;
445 }
446
447 int ipoib_rx_poll(struct napi_struct *napi, int budget)
448 {
449         struct ipoib_dev_priv *priv =
450                 container_of(napi, struct ipoib_dev_priv, recv_napi);
451         struct net_device *dev = priv->dev;
452         int done;
453         int t;
454         int n, i;
455
456         done  = 0;
457
458 poll_more:
459         while (done < budget) {
460                 int max = (budget - done);
461
462                 t = min(IPOIB_NUM_WC, max);
463                 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
464
465                 for (i = 0; i < n; i++) {
466                         struct ib_wc *wc = priv->ibwc + i;
467
468                         if (wc->wr_id & IPOIB_OP_RECV) {
469                                 ++done;
470                                 if (wc->wr_id & IPOIB_OP_CM)
471                                         ipoib_cm_handle_rx_wc(dev, wc);
472                                 else
473                                         ipoib_ib_handle_rx_wc(dev, wc);
474                         } else {
475                                 pr_warn("%s: Got unexpected wqe id\n", __func__);
476                         }
477                 }
478
479                 if (n != t)
480                         break;
481         }
482
483         if (done < budget) {
484                 napi_complete(napi);
485                 if (unlikely(ib_req_notify_cq(priv->recv_cq,
486                                               IB_CQ_NEXT_COMP |
487                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
488                     napi_reschedule(napi))
489                         goto poll_more;
490         }
491
492         return done;
493 }
494
495 int ipoib_tx_poll(struct napi_struct *napi, int budget)
496 {
497         struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv,
498                                                    send_napi);
499         struct net_device *dev = priv->dev;
500         int n, i;
501         struct ib_wc *wc;
502
503 poll_more:
504         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
505
506         for (i = 0; i < n; i++) {
507                 wc = priv->send_wc + i;
508                 if (wc->wr_id & IPOIB_OP_CM)
509                         ipoib_cm_handle_tx_wc(dev, wc);
510                 else
511                         ipoib_ib_handle_tx_wc(dev, wc);
512         }
513
514         if (n < budget) {
515                 napi_complete(napi);
516                 if (unlikely(ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
517                                               IB_CQ_REPORT_MISSED_EVENTS)) &&
518                     napi_reschedule(napi))
519                         goto poll_more;
520         }
521         return n < 0 ? 0 : n;
522 }
523
524 void ipoib_ib_rx_completion(struct ib_cq *cq, void *ctx_ptr)
525 {
526         struct ipoib_dev_priv *priv = ctx_ptr;
527
528         napi_schedule(&priv->recv_napi);
529 }
530
531 void ipoib_ib_tx_completion(struct ib_cq *cq, void *ctx_ptr)
532 {
533         struct ipoib_dev_priv *priv = ctx_ptr;
534
535         napi_schedule(&priv->send_napi);
536 }
537
538 static inline int post_send(struct ipoib_dev_priv *priv,
539                             unsigned int wr_id,
540                             struct ib_ah *address, u32 dqpn,
541                             struct ipoib_tx_buf *tx_req,
542                             void *head, int hlen)
543 {
544         struct sk_buff *skb = tx_req->skb;
545
546         ipoib_build_sge(priv, tx_req);
547
548         priv->tx_wr.wr.wr_id    = wr_id;
549         priv->tx_wr.remote_qpn  = dqpn;
550         priv->tx_wr.ah          = address;
551
552         if (head) {
553                 priv->tx_wr.mss         = skb_shinfo(skb)->gso_size;
554                 priv->tx_wr.header      = head;
555                 priv->tx_wr.hlen        = hlen;
556                 priv->tx_wr.wr.opcode   = IB_WR_LSO;
557         } else
558                 priv->tx_wr.wr.opcode   = IB_WR_SEND;
559
560         return ib_post_send(priv->qp, &priv->tx_wr.wr, NULL);
561 }
562
563 int ipoib_send(struct net_device *dev, struct sk_buff *skb,
564                struct ib_ah *address, u32 dqpn)
565 {
566         struct ipoib_dev_priv *priv = ipoib_priv(dev);
567         struct ipoib_tx_buf *tx_req;
568         int hlen, rc;
569         void *phead;
570         unsigned int usable_sge = priv->max_send_sge - !!skb_headlen(skb);
571
572         if (skb_is_gso(skb)) {
573                 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
574                 phead = skb->data;
575                 if (unlikely(!skb_pull(skb, hlen))) {
576                         ipoib_warn(priv, "linear data too small\n");
577                         ++dev->stats.tx_dropped;
578                         ++dev->stats.tx_errors;
579                         dev_kfree_skb_any(skb);
580                         return -1;
581                 }
582         } else {
583                 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
584                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
585                                    skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
586                         ++dev->stats.tx_dropped;
587                         ++dev->stats.tx_errors;
588                         ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
589                         return -1;
590                 }
591                 phead = NULL;
592                 hlen  = 0;
593         }
594         if (skb_shinfo(skb)->nr_frags > usable_sge) {
595                 if (skb_linearize(skb) < 0) {
596                         ipoib_warn(priv, "skb could not be linearized\n");
597                         ++dev->stats.tx_dropped;
598                         ++dev->stats.tx_errors;
599                         dev_kfree_skb_any(skb);
600                         return -1;
601                 }
602                 /* Does skb_linearize return ok without reducing nr_frags? */
603                 if (skb_shinfo(skb)->nr_frags > usable_sge) {
604                         ipoib_warn(priv, "too many frags after skb linearize\n");
605                         ++dev->stats.tx_dropped;
606                         ++dev->stats.tx_errors;
607                         dev_kfree_skb_any(skb);
608                         return -1;
609                 }
610         }
611
612         ipoib_dbg_data(priv,
613                        "sending packet, length=%d address=%p dqpn=0x%06x\n",
614                        skb->len, address, dqpn);
615
616         /*
617          * We put the skb into the tx_ring _before_ we call post_send()
618          * because it's entirely possible that the completion handler will
619          * run before we execute anything after the post_send().  That
620          * means we have to make sure everything is properly recorded and
621          * our state is consistent before we call post_send().
622          */
623         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
624         tx_req->skb = skb;
625         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
626                 ++dev->stats.tx_errors;
627                 dev_kfree_skb_any(skb);
628                 return -1;
629         }
630
631         if (skb->ip_summed == CHECKSUM_PARTIAL)
632                 priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM;
633         else
634                 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
635         /* increase the tx_head after send success, but use it for queue state */
636         if (priv->tx_head - priv->tx_tail == ipoib_sendq_size - 1) {
637                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
638                 netif_stop_queue(dev);
639         }
640
641         skb_orphan(skb);
642         skb_dst_drop(skb);
643
644         if (netif_queue_stopped(dev))
645                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
646                                      IB_CQ_REPORT_MISSED_EVENTS) < 0)
647                         ipoib_warn(priv, "request notify on send CQ failed\n");
648
649         rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
650                        address, dqpn, tx_req, phead, hlen);
651         if (unlikely(rc)) {
652                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
653                 ++dev->stats.tx_errors;
654                 ipoib_dma_unmap_tx(priv, tx_req);
655                 dev_kfree_skb_any(skb);
656                 if (netif_queue_stopped(dev))
657                         netif_wake_queue(dev);
658                 rc = 0;
659         } else {
660                 netif_trans_update(dev);
661
662                 rc = priv->tx_head;
663                 ++priv->tx_head;
664         }
665         return rc;
666 }
667
668 static void __ipoib_reap_ah(struct net_device *dev)
669 {
670         struct ipoib_dev_priv *priv = ipoib_priv(dev);
671         struct ipoib_ah *ah, *tah;
672         LIST_HEAD(remove_list);
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
689 void 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
702 static 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
711 static 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
719 static 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
732 static 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
753 static 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
761 static 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
769 int 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
834 timeout:
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
844 int 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
856 int 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;
883 out:
884         return -1;
885 }
886
887 int 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
912 dev_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
920 void 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
936 void 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
952 void 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
967 void 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  */
1011 static 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  */
1043 static 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  */
1060 static 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
1149 out:
1150         netif_addr_unlock_bh(priv->dev);
1151
1152         return ret;
1153 }
1154
1155 static 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
1259 void 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
1267 void 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
1275 void 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
1285 void 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