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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
137
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
209
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
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
237
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 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
303partial_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
316void 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
341
342
343
344static 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
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
380free_res:
381 kfree(qp_work);
382}
383
384static 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
431static 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
447int 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
458poll_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
495int 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
503poll_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
524void 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
531void 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
538static 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
563int 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
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
618
619
620
621
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
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
668static 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 unsigned long flags;
673
674 netif_tx_lock_bh(dev);
675 spin_lock_irqsave(&priv->lock, flags);
676
677 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
678 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
679 list_del(&ah->list);
680 rdma_destroy_ah(ah->ah, 0);
681 kfree(ah);
682 }
683
684 spin_unlock_irqrestore(&priv->lock, flags);
685 netif_tx_unlock_bh(dev);
686}
687
688void ipoib_reap_ah(struct work_struct *work)
689{
690 struct ipoib_dev_priv *priv =
691 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
692 struct net_device *dev = priv->dev;
693
694 __ipoib_reap_ah(dev);
695
696 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
697 queue_delayed_work(priv->wq, &priv->ah_reap_task,
698 round_jiffies_relative(HZ));
699}
700
701static void ipoib_flush_ah(struct net_device *dev)
702{
703 struct ipoib_dev_priv *priv = ipoib_priv(dev);
704
705 cancel_delayed_work(&priv->ah_reap_task);
706 flush_workqueue(priv->wq);
707 ipoib_reap_ah(&priv->ah_reap_task.work);
708}
709
710static void ipoib_stop_ah(struct net_device *dev)
711{
712 struct ipoib_dev_priv *priv = ipoib_priv(dev);
713
714 set_bit(IPOIB_STOP_REAPER, &priv->flags);
715 ipoib_flush_ah(dev);
716}
717
718static int recvs_pending(struct net_device *dev)
719{
720 struct ipoib_dev_priv *priv = ipoib_priv(dev);
721 int pending = 0;
722 int i;
723
724 for (i = 0; i < ipoib_recvq_size; ++i)
725 if (priv->rx_ring[i].skb)
726 ++pending;
727
728 return pending;
729}
730
731static void check_qp_movement_and_print(struct ipoib_dev_priv *priv,
732 struct ib_qp *qp,
733 enum ib_qp_state new_state)
734{
735 struct ib_qp_attr qp_attr;
736 struct ib_qp_init_attr query_init_attr;
737 int ret;
738
739 ret = ib_query_qp(qp, &qp_attr, IB_QP_STATE, &query_init_attr);
740 if (ret) {
741 ipoib_warn(priv, "%s: Failed to query QP\n", __func__);
742 return;
743 }
744
745 if (new_state == IB_QPS_ERR && qp_attr.qp_state == IB_QPS_RESET)
746 ipoib_dbg(priv, "Failed modify QP, IB_QPS_RESET to IB_QPS_ERR, acceptable\n");
747 else
748 ipoib_warn(priv, "Failed to modify QP to state: %d from state: %d\n",
749 new_state, qp_attr.qp_state);
750}
751
752static void ipoib_napi_enable(struct net_device *dev)
753{
754 struct ipoib_dev_priv *priv = ipoib_priv(dev);
755
756 napi_enable(&priv->recv_napi);
757 napi_enable(&priv->send_napi);
758}
759
760static void ipoib_napi_disable(struct net_device *dev)
761{
762 struct ipoib_dev_priv *priv = ipoib_priv(dev);
763
764 napi_disable(&priv->recv_napi);
765 napi_disable(&priv->send_napi);
766}
767
768int ipoib_ib_dev_stop_default(struct net_device *dev)
769{
770 struct ipoib_dev_priv *priv = ipoib_priv(dev);
771 struct ib_qp_attr qp_attr;
772 unsigned long begin;
773 struct ipoib_tx_buf *tx_req;
774 int i;
775
776 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
777 ipoib_napi_disable(dev);
778
779 ipoib_cm_dev_stop(dev);
780
781
782
783
784
785 qp_attr.qp_state = IB_QPS_ERR;
786 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
787 check_qp_movement_and_print(priv, priv->qp, IB_QPS_ERR);
788
789
790 begin = jiffies;
791
792 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
793 if (time_after(jiffies, begin + 5 * HZ)) {
794 ipoib_warn(priv,
795 "timing out; %d sends %d receives not completed\n",
796 priv->tx_head - priv->tx_tail,
797 recvs_pending(dev));
798
799
800
801
802
803 while ((int)priv->tx_tail - (int)priv->tx_head < 0) {
804 tx_req = &priv->tx_ring[priv->tx_tail &
805 (ipoib_sendq_size - 1)];
806 ipoib_dma_unmap_tx(priv, tx_req);
807 dev_kfree_skb_any(tx_req->skb);
808 ++priv->tx_tail;
809 }
810
811 for (i = 0; i < ipoib_recvq_size; ++i) {
812 struct ipoib_rx_buf *rx_req;
813
814 rx_req = &priv->rx_ring[i];
815 if (!rx_req->skb)
816 continue;
817 ipoib_ud_dma_unmap_rx(priv,
818 priv->rx_ring[i].mapping);
819 dev_kfree_skb_any(rx_req->skb);
820 rx_req->skb = NULL;
821 }
822
823 goto timeout;
824 }
825
826 ipoib_drain_cq(dev);
827
828 usleep_range(1000, 2000);
829 }
830
831 ipoib_dbg(priv, "All sends and receives done.\n");
832
833timeout:
834 qp_attr.qp_state = IB_QPS_RESET;
835 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
836 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
837
838 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
839
840 return 0;
841}
842
843int ipoib_ib_dev_stop(struct net_device *dev)
844{
845 struct ipoib_dev_priv *priv = ipoib_priv(dev);
846
847 priv->rn_ops->ndo_stop(dev);
848
849 clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
850 ipoib_flush_ah(dev);
851
852 return 0;
853}
854
855int ipoib_ib_dev_open_default(struct net_device *dev)
856{
857 struct ipoib_dev_priv *priv = ipoib_priv(dev);
858 int ret;
859
860 ret = ipoib_init_qp(dev);
861 if (ret) {
862 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
863 return -1;
864 }
865
866 ret = ipoib_ib_post_receives(dev);
867 if (ret) {
868 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
869 goto out;
870 }
871
872 ret = ipoib_cm_dev_open(dev);
873 if (ret) {
874 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
875 goto out;
876 }
877
878 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
879 ipoib_napi_enable(dev);
880
881 return 0;
882out:
883 return -1;
884}
885
886int ipoib_ib_dev_open(struct net_device *dev)
887{
888 struct ipoib_dev_priv *priv = ipoib_priv(dev);
889
890 ipoib_pkey_dev_check_presence(dev);
891
892 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
893 ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey,
894 (!(priv->pkey & 0x7fff) ? "Invalid" : "not found"));
895 return -1;
896 }
897
898 clear_bit(IPOIB_STOP_REAPER, &priv->flags);
899 queue_delayed_work(priv->wq, &priv->ah_reap_task,
900 round_jiffies_relative(HZ));
901
902 if (priv->rn_ops->ndo_open(dev)) {
903 pr_warn("%s: Failed to open dev\n", dev->name);
904 goto dev_stop;
905 }
906
907 set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
908
909 return 0;
910
911dev_stop:
912 set_bit(IPOIB_STOP_REAPER, &priv->flags);
913 cancel_delayed_work(&priv->ah_reap_task);
914 set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
915 ipoib_ib_dev_stop(dev);
916 return -1;
917}
918
919void ipoib_pkey_dev_check_presence(struct net_device *dev)
920{
921 struct ipoib_dev_priv *priv = ipoib_priv(dev);
922 struct rdma_netdev *rn = netdev_priv(dev);
923
924 if (!(priv->pkey & 0x7fff) ||
925 ib_find_pkey(priv->ca, priv->port, priv->pkey,
926 &priv->pkey_index)) {
927 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
928 } else {
929 if (rn->set_id)
930 rn->set_id(dev, priv->pkey_index);
931 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
932 }
933}
934
935void ipoib_ib_dev_up(struct net_device *dev)
936{
937 struct ipoib_dev_priv *priv = ipoib_priv(dev);
938
939 ipoib_pkey_dev_check_presence(dev);
940
941 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
942 ipoib_dbg(priv, "PKEY is not assigned.\n");
943 return;
944 }
945
946 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
947
948 ipoib_mcast_start_thread(dev);
949}
950
951void ipoib_ib_dev_down(struct net_device *dev)
952{
953 struct ipoib_dev_priv *priv = ipoib_priv(dev);
954
955 ipoib_dbg(priv, "downing ib_dev\n");
956
957 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
958 netif_carrier_off(dev);
959
960 ipoib_mcast_stop_thread(dev);
961 ipoib_mcast_dev_flush(dev);
962
963 ipoib_flush_paths(dev);
964}
965
966void ipoib_drain_cq(struct net_device *dev)
967{
968 struct ipoib_dev_priv *priv = ipoib_priv(dev);
969 int i, n;
970
971
972
973
974
975
976 local_bh_disable();
977
978 do {
979 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
980 for (i = 0; i < n; ++i) {
981
982
983
984
985
986 if (priv->ibwc[i].status == IB_WC_SUCCESS)
987 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
988
989 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
990 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
991 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
992 else
993 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
994 } else {
995 pr_warn("%s: Got unexpected wqe id\n", __func__);
996 }
997 }
998 } while (n == IPOIB_NUM_WC);
999
1000 while (poll_tx(priv))
1001 ;
1002
1003 local_bh_enable();
1004}
1005
1006
1007
1008
1009
1010static inline int update_parent_pkey(struct ipoib_dev_priv *priv)
1011{
1012 int result;
1013 u16 prev_pkey;
1014
1015 prev_pkey = priv->pkey;
1016 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
1017 if (result) {
1018 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n",
1019 priv->port, result);
1020 return result;
1021 }
1022
1023 priv->pkey |= 0x8000;
1024
1025 if (prev_pkey != priv->pkey) {
1026 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n",
1027 prev_pkey, priv->pkey);
1028
1029
1030
1031
1032 priv->dev->broadcast[8] = priv->pkey >> 8;
1033 priv->dev->broadcast[9] = priv->pkey & 0xff;
1034 return 0;
1035 }
1036
1037 return 1;
1038}
1039
1040
1041
1042static inline int update_child_pkey(struct ipoib_dev_priv *priv)
1043{
1044 u16 old_index = priv->pkey_index;
1045
1046 priv->pkey_index = 0;
1047 ipoib_pkey_dev_check_presence(priv->dev);
1048
1049 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
1050 (old_index == priv->pkey_index))
1051 return 1;
1052 return 0;
1053}
1054
1055
1056
1057
1058
1059static bool ipoib_dev_addr_changed_valid(struct ipoib_dev_priv *priv)
1060{
1061 union ib_gid search_gid;
1062 union ib_gid gid0;
1063 union ib_gid *netdev_gid;
1064 int err;
1065 u16 index;
1066 u8 port;
1067 bool ret = false;
1068
1069 netdev_gid = (union ib_gid *)(priv->dev->dev_addr + 4);
1070 if (rdma_query_gid(priv->ca, priv->port, 0, &gid0))
1071 return false;
1072
1073 netif_addr_lock_bh(priv->dev);
1074
1075
1076
1077
1078 priv->local_gid.global.subnet_prefix = gid0.global.subnet_prefix;
1079 netdev_gid->global.subnet_prefix = gid0.global.subnet_prefix;
1080 search_gid.global.subnet_prefix = gid0.global.subnet_prefix;
1081
1082 search_gid.global.interface_id = priv->local_gid.global.interface_id;
1083
1084 netif_addr_unlock_bh(priv->dev);
1085
1086 err = ib_find_gid(priv->ca, &search_gid, &port, &index);
1087
1088 netif_addr_lock_bh(priv->dev);
1089
1090 if (search_gid.global.interface_id !=
1091 priv->local_gid.global.interface_id)
1092
1093
1094
1095 goto out;
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122 if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
1123 if (!err && port == priv->port) {
1124 set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1125 if (index == 0)
1126 clear_bit(IPOIB_FLAG_DEV_ADDR_CTRL,
1127 &priv->flags);
1128 else
1129 set_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags);
1130 ret = true;
1131 } else {
1132 ret = false;
1133 }
1134 } else {
1135 if (!err && port == priv->port) {
1136 ret = true;
1137 } else {
1138 if (!test_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags)) {
1139 memcpy(&priv->local_gid, &gid0,
1140 sizeof(priv->local_gid));
1141 memcpy(priv->dev->dev_addr + 4, &gid0,
1142 sizeof(priv->local_gid));
1143 ret = true;
1144 }
1145 }
1146 }
1147
1148out:
1149 netif_addr_unlock_bh(priv->dev);
1150
1151 return ret;
1152}
1153
1154static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
1155 enum ipoib_flush_level level,
1156 int nesting)
1157{
1158 struct ipoib_dev_priv *cpriv;
1159 struct net_device *dev = priv->dev;
1160 int result;
1161
1162 down_read_nested(&priv->vlan_rwsem, nesting);
1163
1164
1165
1166
1167
1168 list_for_each_entry(cpriv, &priv->child_intfs, list)
1169 __ipoib_ib_dev_flush(cpriv, level, nesting + 1);
1170
1171 up_read(&priv->vlan_rwsem);
1172
1173 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) &&
1174 level != IPOIB_FLUSH_HEAVY) {
1175
1176 if (level == IPOIB_FLUSH_LIGHT)
1177 ipoib_dev_addr_changed_valid(priv);
1178 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
1179 return;
1180 }
1181
1182 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1183
1184 if (level == IPOIB_FLUSH_HEAVY) {
1185 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1186 update_parent_pkey(priv);
1187 else
1188 update_child_pkey(priv);
1189 } else if (level == IPOIB_FLUSH_LIGHT)
1190 ipoib_dev_addr_changed_valid(priv);
1191 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
1192 return;
1193 }
1194
1195 if (level == IPOIB_FLUSH_HEAVY) {
1196
1197
1198
1199 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
1200 result = update_child_pkey(priv);
1201 if (result) {
1202
1203 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
1204 return;
1205 }
1206
1207 } else {
1208 result = update_parent_pkey(priv);
1209
1210 if (result) {
1211 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n");
1212 return;
1213 }
1214 }
1215 }
1216
1217 if (level == IPOIB_FLUSH_LIGHT) {
1218 int oper_up;
1219 ipoib_mark_paths_invalid(dev);
1220
1221
1222
1223
1224
1225 oper_up = test_and_clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
1226 ipoib_mcast_dev_flush(dev);
1227 if (oper_up)
1228 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
1229 ipoib_flush_ah(dev);
1230 }
1231
1232 if (level >= IPOIB_FLUSH_NORMAL)
1233 ipoib_ib_dev_down(dev);
1234
1235 if (level == IPOIB_FLUSH_HEAVY) {
1236 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
1237 ipoib_ib_dev_stop(dev);
1238
1239 if (ipoib_ib_dev_open(dev))
1240 return;
1241
1242 if (netif_queue_stopped(dev))
1243 netif_start_queue(dev);
1244 }
1245
1246
1247
1248
1249
1250 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1251 if (level >= IPOIB_FLUSH_NORMAL)
1252 ipoib_ib_dev_up(dev);
1253 if (ipoib_dev_addr_changed_valid(priv))
1254 ipoib_mcast_restart_task(&priv->restart_task);
1255 }
1256}
1257
1258void ipoib_ib_dev_flush_light(struct work_struct *work)
1259{
1260 struct ipoib_dev_priv *priv =
1261 container_of(work, struct ipoib_dev_priv, flush_light);
1262
1263 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0);
1264}
1265
1266void ipoib_ib_dev_flush_normal(struct work_struct *work)
1267{
1268 struct ipoib_dev_priv *priv =
1269 container_of(work, struct ipoib_dev_priv, flush_normal);
1270
1271 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0);
1272}
1273
1274void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1275{
1276 struct ipoib_dev_priv *priv =
1277 container_of(work, struct ipoib_dev_priv, flush_heavy);
1278
1279 rtnl_lock();
1280 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0);
1281 rtnl_unlock();
1282}
1283
1284void ipoib_ib_dev_cleanup(struct net_device *dev)
1285{
1286 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1287
1288 ipoib_dbg(priv, "cleaning up ib_dev\n");
1289
1290
1291
1292
1293 ipoib_flush_paths(dev);
1294
1295 ipoib_mcast_stop_thread(dev);
1296 ipoib_mcast_dev_flush(dev);
1297
1298
1299
1300
1301
1302
1303
1304 ipoib_stop_ah(dev);
1305
1306 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
1307
1308 priv->rn_ops->ndo_uninit(dev);
1309
1310 if (priv->pd) {
1311 ib_dealloc_pd(priv->pd);
1312 priv->pd = NULL;
1313 }
1314}
1315
1316