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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/dma-mapping.h>
38#include <linux/slab.h>
39
40#include <linux/ip.h>
41#include <linux/tcp.h>
42
43#include "ipoib.h"
44
45#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
46static int data_debug_level;
47
48module_param(data_debug_level, int, 0644);
49MODULE_PARM_DESC(data_debug_level,
50 "Enable data path debug tracing if > 0");
51#endif
52
53static DEFINE_MUTEX(pkey_mutex);
54
55struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
56 struct ib_pd *pd, struct ib_ah_attr *attr)
57{
58 struct ipoib_ah *ah;
59
60 ah = kmalloc(sizeof *ah, GFP_KERNEL);
61 if (!ah)
62 return NULL;
63
64 ah->dev = dev;
65 ah->last_send = 0;
66 kref_init(&ah->ref);
67
68 ah->ah = ib_create_ah(pd, attr);
69 if (IS_ERR(ah->ah)) {
70 kfree(ah);
71 ah = NULL;
72 } else
73 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
74
75 return ah;
76}
77
78void ipoib_free_ah(struct kref *kref)
79{
80 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
81 struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
82
83 unsigned long flags;
84
85 spin_lock_irqsave(&priv->lock, flags);
86 list_add_tail(&ah->list, &priv->dead_ahs);
87 spin_unlock_irqrestore(&priv->lock, flags);
88}
89
90static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
91 u64 mapping[IPOIB_UD_RX_SG])
92{
93 if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
94 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_UD_HEAD_SIZE,
95 DMA_FROM_DEVICE);
96 ib_dma_unmap_page(priv->ca, mapping[1], PAGE_SIZE,
97 DMA_FROM_DEVICE);
98 } else
99 ib_dma_unmap_single(priv->ca, mapping[0],
100 IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
101 DMA_FROM_DEVICE);
102}
103
104static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv,
105 struct sk_buff *skb,
106 unsigned int length)
107{
108 if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
109 skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
110 unsigned int size;
111 /*
112 * There is only two buffers needed for max_payload = 4K,
113 * first buf size is IPOIB_UD_HEAD_SIZE
114 */
115 skb->tail += IPOIB_UD_HEAD_SIZE;
116 skb->len += length;
117
118 size = length - IPOIB_UD_HEAD_SIZE;
119
120 frag->size = size;
121 skb->data_len += size;
122 skb->truesize += size;
123 } else
124 skb_put(skb, length);
125
126}
127
128static int ipoib_ib_post_receive(struct net_device *dev, int id)
129{
130 struct ipoib_dev_priv *priv = netdev_priv(dev);
131 struct ib_recv_wr *bad_wr;
132 int ret;
133
134 priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
135 priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
136 priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
137
138
139 ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
140 if (unlikely(ret)) {
141 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
142 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
143 dev_kfree_skb_any(priv->rx_ring[id].skb);
144 priv->rx_ring[id].skb = NULL;
145 }
146
147 return ret;
148}
149
150static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
151{
152 struct ipoib_dev_priv *priv = netdev_priv(dev);
153 struct sk_buff *skb;
154 int buf_size;
155 u64 *mapping;
156
157 if (ipoib_ud_need_sg(priv->max_ib_mtu))
158 buf_size = IPOIB_UD_HEAD_SIZE;
159 else
160 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
161
162 skb = dev_alloc_skb(buf_size + 4);
163 if (unlikely(!skb))
164 return NULL;
165
166 /*
167 * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
168 * header. So we need 4 more bytes to get to 48 and align the
169 * IP header to a multiple of 16.
170 */
171 skb_reserve(skb, 4);
172
173 mapping = priv->rx_ring[id].mapping;
174 mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
175 DMA_FROM_DEVICE);
176 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
177 goto error;
178
179 if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
180 struct page *page = alloc_page(GFP_ATOMIC);
181 if (!page)
182 goto partial_error;
183 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE);
184 mapping[1] =
185 ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[0].page,
186 0, PAGE_SIZE, DMA_FROM_DEVICE);
187 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1])))
188 goto partial_error;
189 }
190
191 priv->rx_ring[id].skb = skb;
192 return skb;
193
194partial_error:
195 ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE);
196error:
197 dev_kfree_skb_any(skb);
198 return NULL;
199}
200
201static int ipoib_ib_post_receives(struct net_device *dev)
202{
203 struct ipoib_dev_priv *priv = netdev_priv(dev);
204 int i;
205
206 for (i = 0; i < ipoib_recvq_size; ++i) {
207 if (!ipoib_alloc_rx_skb(dev, i)) {
208 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
209 return -ENOMEM;
210 }
211 if (ipoib_ib_post_receive(dev, i)) {
212 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
213 return -EIO;
214 }
215 }
216
217 return 0;
218}
219
220static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
221{
222 struct ipoib_dev_priv *priv = netdev_priv(dev);
223 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
224 struct sk_buff *skb;
225 u64 mapping[IPOIB_UD_RX_SG];
226 union ib_gid *dgid;
227
228 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
229 wr_id, wc->status);
230
231 if (unlikely(wr_id >= ipoib_recvq_size)) {
232 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
233 wr_id, ipoib_recvq_size);
234 return;
235 }
236
237 skb = priv->rx_ring[wr_id].skb;
238
239 if (unlikely(wc->status != IB_WC_SUCCESS)) {
240 if (wc->status != IB_WC_WR_FLUSH_ERR)
241 ipoib_warn(priv, "failed recv event "
242 "(status=%d, wrid=%d vend_err %x)\n",
243 wc->status, wr_id, wc->vendor_err);
244 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
245 dev_kfree_skb_any(skb);
246 priv->rx_ring[wr_id].skb = NULL;
247 return;
248 }
249
250 /*
251 * Drop packets that this interface sent, ie multicast packets
252 * that the HCA has replicated.
253 */
254 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
255 goto repost;
256
257 memcpy(mapping, priv->rx_ring[wr_id].mapping,
258 IPOIB_UD_RX_SG * sizeof *mapping);
259
260 /*
261 * If we can't allocate a new RX buffer, dump
262 * this packet and reuse the old buffer.
263 */
264 if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
265 ++dev->stats.rx_dropped;
266 goto repost;
267 }
268
269 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
270 wc->byte_len, wc->slid);
271
272 ipoib_ud_dma_unmap_rx(priv, mapping);
273 ipoib_ud_skb_put_frags(priv, skb, wc->byte_len);
274
275 /* First byte of dgid signals multicast when 0xff */
276 dgid = &((struct ib_grh *)skb->data)->dgid;
277
278 if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff)
279 skb->pkt_type = PACKET_HOST;
280 else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0)
281 skb->pkt_type = PACKET_BROADCAST;
282 else
283 skb->pkt_type = PACKET_MULTICAST;
284
285 skb_pull(skb, IB_GRH_BYTES);
286
287 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
288 skb_reset_mac_header(skb);
289 skb_pull(skb, IPOIB_ENCAP_LEN);
290
291 ++dev->stats.rx_packets;
292 dev->stats.rx_bytes += skb->len;
293
294 skb->dev = dev;
295 if ((dev->features & NETIF_F_RXCSUM) && likely(wc->csum_ok))
296 skb->ip_summed = CHECKSUM_UNNECESSARY;
297
298 napi_gro_receive(&priv->napi, skb);
299
300repost:
301 if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
302 ipoib_warn(priv, "ipoib_ib_post_receive failed "
303 "for buf %d\n", wr_id);
304}
305
306static int ipoib_dma_map_tx(struct ib_device *ca,
307 struct ipoib_tx_buf *tx_req)
308{
309 struct sk_buff *skb = tx_req->skb;
310 u64 *mapping = tx_req->mapping;
311 int i;
312 int off;
313
314 if (skb_headlen(skb)) {
315 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
316 DMA_TO_DEVICE);
317 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
318 return -EIO;
319
320 off = 1;
321 } else
322 off = 0;
323
324 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
325 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
326 mapping[i + off] = ib_dma_map_page(ca, frag->page,
327 frag->page_offset, frag->size,
328 DMA_TO_DEVICE);
329 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
330 goto partial_error;
331 }
332 return 0;
333
334partial_error:
335 for (; i > 0; --i) {
336 skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
337 ib_dma_unmap_page(ca, mapping[i - !off], frag->size, DMA_TO_DEVICE);
338 }
339
340 if (off)
341 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
342
343 return -EIO;
344}
345
346static void ipoib_dma_unmap_tx(struct ib_device *ca,
347 struct ipoib_tx_buf *tx_req)
348{
349 struct sk_buff *skb = tx_req->skb;
350 u64 *mapping = tx_req->mapping;
351 int i;
352 int off;
353
354 if (skb_headlen(skb)) {
355 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
356 off = 1;
357 } else
358 off = 0;
359
360 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
361 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
362 ib_dma_unmap_page(ca, mapping[i + off], frag->size,
363 DMA_TO_DEVICE);
364 }
365}
366
367static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
368{
369 struct ipoib_dev_priv *priv = netdev_priv(dev);
370 unsigned int wr_id = wc->wr_id;
371 struct ipoib_tx_buf *tx_req;
372
373 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
374 wr_id, wc->status);
375
376 if (unlikely(wr_id >= ipoib_sendq_size)) {
377 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
378 wr_id, ipoib_sendq_size);
379 return;
380 }
381
382 tx_req = &priv->tx_ring[wr_id];
383
384 ipoib_dma_unmap_tx(priv->ca, tx_req);
385
386 ++dev->stats.tx_packets;
387 dev->stats.tx_bytes += tx_req->skb->len;
388
389 dev_kfree_skb_any(tx_req->skb);
390
391 ++priv->tx_tail;
392 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
393 netif_queue_stopped(dev) &&
394 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
395 netif_wake_queue(dev);
396
397 if (wc->status != IB_WC_SUCCESS &&
398 wc->status != IB_WC_WR_FLUSH_ERR)
399 ipoib_warn(priv, "failed send event "
400 "(status=%d, wrid=%d vend_err %x)\n",
401 wc->status, wr_id, wc->vendor_err);
402}
403
404static int poll_tx(struct ipoib_dev_priv *priv)
405{
406 int n, i;
407
408 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
409 for (i = 0; i < n; ++i)
410 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
411
412 return n == MAX_SEND_CQE;
413}
414
415int ipoib_poll(struct napi_struct *napi, int budget)
416{
417 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
418 struct net_device *dev = priv->dev;
419 int done;
420 int t;
421 int n, i;
422
423 done = 0;
424
425poll_more:
426 while (done < budget) {
427 int max = (budget - done);
428
429 t = min(IPOIB_NUM_WC, max);
430 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
431
432 for (i = 0; i < n; i++) {
433 struct ib_wc *wc = priv->ibwc + i;
434
435 if (wc->wr_id & IPOIB_OP_RECV) {
436 ++done;
437 if (wc->wr_id & IPOIB_OP_CM)
438 ipoib_cm_handle_rx_wc(dev, wc);
439 else
440 ipoib_ib_handle_rx_wc(dev, wc);
441 } else
442 ipoib_cm_handle_tx_wc(priv->dev, wc);
443 }
444
445 if (n != t)
446 break;
447 }
448
449 if (done < budget) {
450 napi_complete(napi);
451 if (unlikely(ib_req_notify_cq(priv->recv_cq,
452 IB_CQ_NEXT_COMP |
453 IB_CQ_REPORT_MISSED_EVENTS)) &&
454 napi_reschedule(napi))
455 goto poll_more;
456 }
457
458 return done;
459}
460
461void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
462{
463 struct net_device *dev = dev_ptr;
464 struct ipoib_dev_priv *priv = netdev_priv(dev);
465
466 napi_schedule(&priv->napi);
467}
468
469static void drain_tx_cq(struct net_device *dev)
470{
471 struct ipoib_dev_priv *priv = netdev_priv(dev);
472
473 netif_tx_lock(dev);
474 while (poll_tx(priv))
475 ; /* nothing */
476
477 if (netif_queue_stopped(dev))
478 mod_timer(&priv->poll_timer, jiffies + 1);
479
480 netif_tx_unlock(dev);
481}
482
483void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
484{
485 struct ipoib_dev_priv *priv = netdev_priv(dev_ptr);
486
487 mod_timer(&priv->poll_timer, jiffies);
488}
489
490static inline int post_send(struct ipoib_dev_priv *priv,
491 unsigned int wr_id,
492 struct ib_ah *address, u32 qpn,
493 struct ipoib_tx_buf *tx_req,
494 void *head, int hlen)
495{
496 struct ib_send_wr *bad_wr;
497 int i, off;
498 struct sk_buff *skb = tx_req->skb;
499 skb_frag_t *frags = skb_shinfo(skb)->frags;
500 int nr_frags = skb_shinfo(skb)->nr_frags;
501 u64 *mapping = tx_req->mapping;
502
503 if (skb_headlen(skb)) {
504 priv->tx_sge[0].addr = mapping[0];
505 priv->tx_sge[0].length = skb_headlen(skb);
506 off = 1;
507 } else
508 off = 0;
509
510 for (i = 0; i < nr_frags; ++i) {
511 priv->tx_sge[i + off].addr = mapping[i + off];
512 priv->tx_sge[i + off].length = frags[i].size;
513 }
514 priv->tx_wr.num_sge = nr_frags + off;
515 priv->tx_wr.wr_id = wr_id;
516 priv->tx_wr.wr.ud.remote_qpn = qpn;
517 priv->tx_wr.wr.ud.ah = address;
518
519 if (head) {
520 priv->tx_wr.wr.ud.mss = skb_shinfo(skb)->gso_size;
521 priv->tx_wr.wr.ud.header = head;
522 priv->tx_wr.wr.ud.hlen = hlen;
523 priv->tx_wr.opcode = IB_WR_LSO;
524 } else
525 priv->tx_wr.opcode = IB_WR_SEND;
526
527 return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
528}
529
530void ipoib_send(struct net_device *dev, struct sk_buff *skb,
531 struct ipoib_ah *address, u32 qpn)
532{
533 struct ipoib_dev_priv *priv = netdev_priv(dev);
534 struct ipoib_tx_buf *tx_req;
535 int hlen, rc;
536 void *phead;
537
538 if (skb_is_gso(skb)) {
539 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
540 phead = skb->data;
541 if (unlikely(!skb_pull(skb, hlen))) {
542 ipoib_warn(priv, "linear data too small\n");
543 ++dev->stats.tx_dropped;
544 ++dev->stats.tx_errors;
545 dev_kfree_skb_any(skb);
546 return;
547 }
548 } else {
549 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
550 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
551 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
552 ++dev->stats.tx_dropped;
553 ++dev->stats.tx_errors;
554 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
555 return;
556 }
557 phead = NULL;
558 hlen = 0;
559 }
560
561 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
562 skb->len, address, qpn);
563
564 /*
565 * We put the skb into the tx_ring _before_ we call post_send()
566 * because it's entirely possible that the completion handler will
567 * run before we execute anything after the post_send(). That
568 * means we have to make sure everything is properly recorded and
569 * our state is consistent before we call post_send().
570 */
571 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
572 tx_req->skb = skb;
573 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
574 ++dev->stats.tx_errors;
575 dev_kfree_skb_any(skb);
576 return;
577 }
578
579 if (skb->ip_summed == CHECKSUM_PARTIAL)
580 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
581 else
582 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
583
584 if (++priv->tx_outstanding == ipoib_sendq_size) {
585 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
586 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
587 ipoib_warn(priv, "request notify on send CQ failed\n");
588 netif_stop_queue(dev);
589 }
590
591 rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
592 address->ah, qpn, tx_req, phead, hlen);
593 if (unlikely(rc)) {
594 ipoib_warn(priv, "post_send failed, error %d\n", rc);
595 ++dev->stats.tx_errors;
596 --priv->tx_outstanding;
597 ipoib_dma_unmap_tx(priv->ca, tx_req);
598 dev_kfree_skb_any(skb);
599 if (netif_queue_stopped(dev))
600 netif_wake_queue(dev);
601 } else {
602 dev->trans_start = jiffies;
603
604 address->last_send = priv->tx_head;
605 ++priv->tx_head;
606 skb_orphan(skb);
607
608 }
609
610 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
611 while (poll_tx(priv))
612 ; /* nothing */
613}
614
615static void __ipoib_reap_ah(struct net_device *dev)
616{
617 struct ipoib_dev_priv *priv = netdev_priv(dev);
618 struct ipoib_ah *ah, *tah;
619 LIST_HEAD(remove_list);
620 unsigned long flags;
621
622 netif_tx_lock_bh(dev);
623 spin_lock_irqsave(&priv->lock, flags);
624
625 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
626 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
627 list_del(&ah->list);
628 ib_destroy_ah(ah->ah);
629 kfree(ah);
630 }
631
632 spin_unlock_irqrestore(&priv->lock, flags);
633 netif_tx_unlock_bh(dev);
634}
635
636void ipoib_reap_ah(struct work_struct *work)
637{
638 struct ipoib_dev_priv *priv =
639 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
640 struct net_device *dev = priv->dev;
641
642 __ipoib_reap_ah(dev);
643
644 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
645 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
646 round_jiffies_relative(HZ));
647}
648
649static void ipoib_ib_tx_timer_func(unsigned long ctx)
650{
651 drain_tx_cq((struct net_device *)ctx);
652}
653
654int ipoib_ib_dev_open(struct net_device *dev)
655{
656 struct ipoib_dev_priv *priv = netdev_priv(dev);
657 int ret;
658
659 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
660 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
661 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
662 return -1;
663 }
664 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
665
666 ret = ipoib_init_qp(dev);
667 if (ret) {
668 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
669 return -1;
670 }
671
672 ret = ipoib_ib_post_receives(dev);
673 if (ret) {
674 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
675 ipoib_ib_dev_stop(dev, 1);
676 return -1;
677 }
678
679 ret = ipoib_cm_dev_open(dev);
680 if (ret) {
681 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
682 ipoib_ib_dev_stop(dev, 1);
683 return -1;
684 }
685
686 clear_bit(IPOIB_STOP_REAPER, &priv->flags);
687 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
688 round_jiffies_relative(HZ));
689
690 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
691 napi_enable(&priv->napi);
692
693 return 0;
694}
695
696static void ipoib_pkey_dev_check_presence(struct net_device *dev)
697{
698 struct ipoib_dev_priv *priv = netdev_priv(dev);
699 u16 pkey_index = 0;
700
701 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
702 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
703 else
704 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
705}
706
707int ipoib_ib_dev_up(struct net_device *dev)
708{
709 struct ipoib_dev_priv *priv = netdev_priv(dev);
710
711 ipoib_pkey_dev_check_presence(dev);
712
713 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
714 ipoib_dbg(priv, "PKEY is not assigned.\n");
715 return 0;
716 }
717
718 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
719
720 return ipoib_mcast_start_thread(dev);
721}
722
723int ipoib_ib_dev_down(struct net_device *dev, int flush)
724{
725 struct ipoib_dev_priv *priv = netdev_priv(dev);
726
727 ipoib_dbg(priv, "downing ib_dev\n");
728
729 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
730 netif_carrier_off(dev);
731
732 /* Shutdown the P_Key thread if still active */
733 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
734 mutex_lock(&pkey_mutex);
735 set_bit(IPOIB_PKEY_STOP, &priv->flags);
736 cancel_delayed_work(&priv->pkey_poll_task);
737 mutex_unlock(&pkey_mutex);
738 if (flush)
739 flush_workqueue(ipoib_workqueue);
740 }
741
742 ipoib_mcast_stop_thread(dev, flush);
743 ipoib_mcast_dev_flush(dev);
744
745 ipoib_flush_paths(dev);
746
747 return 0;
748}
749
750static int recvs_pending(struct net_device *dev)
751{
752 struct ipoib_dev_priv *priv = netdev_priv(dev);
753 int pending = 0;
754 int i;
755
756 for (i = 0; i < ipoib_recvq_size; ++i)
757 if (priv->rx_ring[i].skb)
758 ++pending;
759
760 return pending;
761}
762
763void ipoib_drain_cq(struct net_device *dev)
764{
765 struct ipoib_dev_priv *priv = netdev_priv(dev);
766 int i, n;
767
768 /*
769 * We call completion handling routines that expect to be
770 * called from the BH-disabled NAPI poll context, so disable
771 * BHs here too.
772 */
773 local_bh_disable();
774
775 do {
776 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
777 for (i = 0; i < n; ++i) {
778 /*
779 * Convert any successful completions to flush
780 * errors to avoid passing packets up the
781 * stack after bringing the device down.
782 */
783 if (priv->ibwc[i].status == IB_WC_SUCCESS)
784 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
785
786 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
787 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
788 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
789 else
790 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
791 } else
792 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
793 }
794 } while (n == IPOIB_NUM_WC);
795
796 while (poll_tx(priv))
797 ; /* nothing */
798
799 local_bh_enable();
800}
801
802int ipoib_ib_dev_stop(struct net_device *dev, int flush)
803{
804 struct ipoib_dev_priv *priv = netdev_priv(dev);
805 struct ib_qp_attr qp_attr;
806 unsigned long begin;
807 struct ipoib_tx_buf *tx_req;
808 int i;
809
810 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
811 napi_disable(&priv->napi);
812
813 ipoib_cm_dev_stop(dev);
814
815 /*
816 * Move our QP to the error state and then reinitialize in
817 * when all work requests have completed or have been flushed.
818 */
819 qp_attr.qp_state = IB_QPS_ERR;
820 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
821 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
822
823 /* Wait for all sends and receives to complete */
824 begin = jiffies;
825
826 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
827 if (time_after(jiffies, begin + 5 * HZ)) {
828 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
829 priv->tx_head - priv->tx_tail, recvs_pending(dev));
830
831 /*
832 * assume the HW is wedged and just free up
833 * all our pending work requests.
834 */
835 while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
836 tx_req = &priv->tx_ring[priv->tx_tail &
837 (ipoib_sendq_size - 1)];
838 ipoib_dma_unmap_tx(priv->ca, tx_req);
839 dev_kfree_skb_any(tx_req->skb);
840 ++priv->tx_tail;
841 --priv->tx_outstanding;
842 }
843
844 for (i = 0; i < ipoib_recvq_size; ++i) {
845 struct ipoib_rx_buf *rx_req;
846
847 rx_req = &priv->rx_ring[i];
848 if (!rx_req->skb)
849 continue;
850 ipoib_ud_dma_unmap_rx(priv,
851 priv->rx_ring[i].mapping);
852 dev_kfree_skb_any(rx_req->skb);
853 rx_req->skb = NULL;
854 }
855
856 goto timeout;
857 }
858
859 ipoib_drain_cq(dev);
860
861 msleep(1);
862 }
863
864 ipoib_dbg(priv, "All sends and receives done.\n");
865
866timeout:
867 del_timer_sync(&priv->poll_timer);
868 qp_attr.qp_state = IB_QPS_RESET;
869 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
870 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
871
872 /* Wait for all AHs to be reaped */
873 set_bit(IPOIB_STOP_REAPER, &priv->flags);
874 cancel_delayed_work(&priv->ah_reap_task);
875 if (flush)
876 flush_workqueue(ipoib_workqueue);
877
878 begin = jiffies;
879
880 while (!list_empty(&priv->dead_ahs)) {
881 __ipoib_reap_ah(dev);
882
883 if (time_after(jiffies, begin + HZ)) {
884 ipoib_warn(priv, "timing out; will leak address handles\n");
885 break;
886 }
887
888 msleep(1);
889 }
890
891 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
892
893 return 0;
894}
895
896int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
897{
898 struct ipoib_dev_priv *priv = netdev_priv(dev);
899
900 priv->ca = ca;
901 priv->port = port;
902 priv->qp = NULL;
903
904 if (ipoib_transport_dev_init(dev, ca)) {
905 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
906 return -ENODEV;
907 }
908
909 setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
910 (unsigned long) dev);
911
912 if (dev->flags & IFF_UP) {
913 if (ipoib_ib_dev_open(dev)) {
914 ipoib_transport_dev_cleanup(dev);
915 return -ENODEV;
916 }
917 }
918
919 return 0;
920}
921
922static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
923 enum ipoib_flush_level level)
924{
925 struct ipoib_dev_priv *cpriv;
926 struct net_device *dev = priv->dev;
927 u16 new_index;
928
929 mutex_lock(&priv->vlan_mutex);
930
931 /*
932 * Flush any child interfaces too -- they might be up even if
933 * the parent is down.
934 */
935 list_for_each_entry(cpriv, &priv->child_intfs, list)
936 __ipoib_ib_dev_flush(cpriv, level);
937
938 mutex_unlock(&priv->vlan_mutex);
939
940 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
941 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
942 return;
943 }
944
945 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
946 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
947 return;
948 }
949
950 if (level == IPOIB_FLUSH_HEAVY) {
951 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
952 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
953 ipoib_ib_dev_down(dev, 0);
954 ipoib_ib_dev_stop(dev, 0);
955 if (ipoib_pkey_dev_delay_open(dev))
956 return;
957 }
958
959 /* restart QP only if P_Key index is changed */
960 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
961 new_index == priv->pkey_index) {
962 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
963 return;
964 }
965 priv->pkey_index = new_index;
966 }
967
968 if (level == IPOIB_FLUSH_LIGHT) {
969 ipoib_mark_paths_invalid(dev);
970 ipoib_mcast_dev_flush(dev);
971 }
972
973 if (level >= IPOIB_FLUSH_NORMAL)
974 ipoib_ib_dev_down(dev, 0);
975
976 if (level == IPOIB_FLUSH_HEAVY) {
977 ipoib_ib_dev_stop(dev, 0);
978 ipoib_ib_dev_open(dev);
979 }
980
981 /*
982 * The device could have been brought down between the start and when
983 * we get here, don't bring it back up if it's not configured up
984 */
985 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
986 if (level >= IPOIB_FLUSH_NORMAL)
987 ipoib_ib_dev_up(dev);
988 ipoib_mcast_restart_task(&priv->restart_task);
989 }
990}
991
992void ipoib_ib_dev_flush_light(struct work_struct *work)
993{
994 struct ipoib_dev_priv *priv =
995 container_of(work, struct ipoib_dev_priv, flush_light);
996
997 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
998}
999
1000void ipoib_ib_dev_flush_normal(struct work_struct *work)
1001{
1002 struct ipoib_dev_priv *priv =
1003 container_of(work, struct ipoib_dev_priv, flush_normal);
1004
1005 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
1006}
1007
1008void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1009{
1010 struct ipoib_dev_priv *priv =
1011 container_of(work, struct ipoib_dev_priv, flush_heavy);
1012
1013 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
1014}
1015
1016void ipoib_ib_dev_cleanup(struct net_device *dev)
1017{
1018 struct ipoib_dev_priv *priv = netdev_priv(dev);
1019
1020 ipoib_dbg(priv, "cleaning up ib_dev\n");
1021
1022 ipoib_mcast_stop_thread(dev, 1);
1023 ipoib_mcast_dev_flush(dev);
1024
1025 ipoib_transport_dev_cleanup(dev);
1026}
1027
1028/*
1029 * Delayed P_Key Assigment Interim Support
1030 *
1031 * The following is initial implementation of delayed P_Key assigment
1032 * mechanism. It is using the same approach implemented for the multicast
1033 * group join. The single goal of this implementation is to quickly address
1034 * Bug #2507. This implementation will probably be removed when the P_Key
1035 * change async notification is available.
1036 */
1037
1038void ipoib_pkey_poll(struct work_struct *work)
1039{
1040 struct ipoib_dev_priv *priv =
1041 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
1042 struct net_device *dev = priv->dev;
1043
1044 ipoib_pkey_dev_check_presence(dev);
1045
1046 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
1047 ipoib_open(dev);
1048 else {
1049 mutex_lock(&pkey_mutex);
1050 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
1051 queue_delayed_work(ipoib_workqueue,
1052 &priv->pkey_poll_task,
1053 HZ);
1054 mutex_unlock(&pkey_mutex);
1055 }
1056}
1057
1058int ipoib_pkey_dev_delay_open(struct net_device *dev)
1059{
1060 struct ipoib_dev_priv *priv = netdev_priv(dev);
1061
1062 /* Look for the interface pkey value in the IB Port P_Key table and */
1063 /* set the interface pkey assigment flag */
1064 ipoib_pkey_dev_check_presence(dev);
1065
1066 /* P_Key value not assigned yet - start polling */
1067 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
1068 mutex_lock(&pkey_mutex);
1069 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1070 queue_delayed_work(ipoib_workqueue,
1071 &priv->pkey_poll_task,
1072 HZ);
1073 mutex_unlock(&pkey_mutex);
1074 return 1;
1075 }
1076
1077 return 0;
1078}