Linux 4.2.1
[linux/fpc-iii.git] / drivers / infiniband / ulp / ipoib / ipoib_ib.c
blobd266667ca9b82273dd4b7abb4856f69b29f65174
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.
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:
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
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.
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.
36 #include <linux/delay.h>
37 #include <linux/moduleparam.h>
38 #include <linux/dma-mapping.h>
39 #include <linux/slab.h>
41 #include <linux/ip.h>
42 #include <linux/tcp.h>
44 #include "ipoib.h"
46 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
47 static int data_debug_level;
49 module_param(data_debug_level, int, 0644);
50 MODULE_PARM_DESC(data_debug_level,
51 "Enable data path debug tracing if > 0");
52 #endif
54 static DEFINE_MUTEX(pkey_mutex);
56 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
57 struct ib_pd *pd, struct ib_ah_attr *attr)
59 struct ipoib_ah *ah;
60 struct ib_ah *vah;
62 ah = kmalloc(sizeof *ah, GFP_KERNEL);
63 if (!ah)
64 return ERR_PTR(-ENOMEM);
66 ah->dev = dev;
67 ah->last_send = 0;
68 kref_init(&ah->ref);
70 vah = ib_create_ah(pd, attr);
71 if (IS_ERR(vah)) {
72 kfree(ah);
73 ah = (struct ipoib_ah *)vah;
74 } else {
75 ah->ah = vah;
76 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
79 return ah;
82 void ipoib_free_ah(struct kref *kref)
84 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
85 struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
87 unsigned long flags;
89 spin_lock_irqsave(&priv->lock, flags);
90 list_add_tail(&ah->list, &priv->dead_ahs);
91 spin_unlock_irqrestore(&priv->lock, flags);
94 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
95 u64 mapping[IPOIB_UD_RX_SG])
97 ib_dma_unmap_single(priv->ca, mapping[0],
98 IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
99 DMA_FROM_DEVICE);
102 static int ipoib_ib_post_receive(struct net_device *dev, int id)
104 struct ipoib_dev_priv *priv = netdev_priv(dev);
105 struct ib_recv_wr *bad_wr;
106 int ret;
108 priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
109 priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
110 priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
113 ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
114 if (unlikely(ret)) {
115 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
116 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
117 dev_kfree_skb_any(priv->rx_ring[id].skb);
118 priv->rx_ring[id].skb = NULL;
121 return ret;
124 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
126 struct ipoib_dev_priv *priv = netdev_priv(dev);
127 struct sk_buff *skb;
128 int buf_size;
129 u64 *mapping;
131 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
133 skb = dev_alloc_skb(buf_size + IPOIB_ENCAP_LEN);
134 if (unlikely(!skb))
135 return NULL;
138 * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
139 * header. So we need 4 more bytes to get to 48 and align the
140 * IP header to a multiple of 16.
142 skb_reserve(skb, 4);
144 mapping = priv->rx_ring[id].mapping;
145 mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
146 DMA_FROM_DEVICE);
147 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
148 goto error;
150 priv->rx_ring[id].skb = skb;
151 return skb;
152 error:
153 dev_kfree_skb_any(skb);
154 return NULL;
157 static int ipoib_ib_post_receives(struct net_device *dev)
159 struct ipoib_dev_priv *priv = netdev_priv(dev);
160 int i;
162 for (i = 0; i < ipoib_recvq_size; ++i) {
163 if (!ipoib_alloc_rx_skb(dev, i)) {
164 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
165 return -ENOMEM;
167 if (ipoib_ib_post_receive(dev, i)) {
168 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
169 return -EIO;
173 return 0;
176 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
178 struct ipoib_dev_priv *priv = netdev_priv(dev);
179 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
180 struct sk_buff *skb;
181 u64 mapping[IPOIB_UD_RX_SG];
182 union ib_gid *dgid;
184 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
185 wr_id, wc->status);
187 if (unlikely(wr_id >= ipoib_recvq_size)) {
188 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
189 wr_id, ipoib_recvq_size);
190 return;
193 skb = priv->rx_ring[wr_id].skb;
195 if (unlikely(wc->status != IB_WC_SUCCESS)) {
196 if (wc->status != IB_WC_WR_FLUSH_ERR)
197 ipoib_warn(priv, "failed recv event "
198 "(status=%d, wrid=%d vend_err %x)\n",
199 wc->status, wr_id, wc->vendor_err);
200 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
201 dev_kfree_skb_any(skb);
202 priv->rx_ring[wr_id].skb = NULL;
203 return;
207 * Drop packets that this interface sent, ie multicast packets
208 * that the HCA has replicated.
210 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
211 goto repost;
213 memcpy(mapping, priv->rx_ring[wr_id].mapping,
214 IPOIB_UD_RX_SG * sizeof *mapping);
217 * If we can't allocate a new RX buffer, dump
218 * this packet and reuse the old buffer.
220 if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
221 ++dev->stats.rx_dropped;
222 goto repost;
225 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
226 wc->byte_len, wc->slid);
228 ipoib_ud_dma_unmap_rx(priv, mapping);
230 skb_put(skb, wc->byte_len);
232 /* First byte of dgid signals multicast when 0xff */
233 dgid = &((struct ib_grh *)skb->data)->dgid;
235 if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff)
236 skb->pkt_type = PACKET_HOST;
237 else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0)
238 skb->pkt_type = PACKET_BROADCAST;
239 else
240 skb->pkt_type = PACKET_MULTICAST;
242 skb_pull(skb, IB_GRH_BYTES);
244 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
245 skb_reset_mac_header(skb);
246 skb_pull(skb, IPOIB_ENCAP_LEN);
248 skb->truesize = SKB_TRUESIZE(skb->len);
250 ++dev->stats.rx_packets;
251 dev->stats.rx_bytes += skb->len;
253 skb->dev = dev;
254 if ((dev->features & NETIF_F_RXCSUM) &&
255 likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
256 skb->ip_summed = CHECKSUM_UNNECESSARY;
258 napi_gro_receive(&priv->napi, skb);
260 repost:
261 if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
262 ipoib_warn(priv, "ipoib_ib_post_receive failed "
263 "for buf %d\n", wr_id);
266 int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req)
268 struct sk_buff *skb = tx_req->skb;
269 u64 *mapping = tx_req->mapping;
270 int i;
271 int off;
273 if (skb_headlen(skb)) {
274 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
275 DMA_TO_DEVICE);
276 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
277 return -EIO;
279 off = 1;
280 } else
281 off = 0;
283 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
284 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
285 mapping[i + off] = ib_dma_map_page(ca,
286 skb_frag_page(frag),
287 frag->page_offset, skb_frag_size(frag),
288 DMA_TO_DEVICE);
289 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
290 goto partial_error;
292 return 0;
294 partial_error:
295 for (; i > 0; --i) {
296 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
298 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE);
301 if (off)
302 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
304 return -EIO;
307 void ipoib_dma_unmap_tx(struct ipoib_dev_priv *priv,
308 struct ipoib_tx_buf *tx_req)
310 struct sk_buff *skb = tx_req->skb;
311 u64 *mapping = tx_req->mapping;
312 int i;
313 int off;
315 if (skb_headlen(skb)) {
316 ib_dma_unmap_single(priv->ca, mapping[0], skb_headlen(skb),
317 DMA_TO_DEVICE);
318 off = 1;
319 } else
320 off = 0;
322 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
323 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
325 ib_dma_unmap_page(priv->ca, mapping[i + off],
326 skb_frag_size(frag), DMA_TO_DEVICE);
331 * As the result of a completion error the QP Can be transferred to SQE states.
332 * The function checks if the (send)QP is in SQE state and
333 * moves it back to RTS state, that in order to have it functional again.
335 static void ipoib_qp_state_validate_work(struct work_struct *work)
337 struct ipoib_qp_state_validate *qp_work =
338 container_of(work, struct ipoib_qp_state_validate, work);
340 struct ipoib_dev_priv *priv = qp_work->priv;
341 struct ib_qp_attr qp_attr;
342 struct ib_qp_init_attr query_init_attr;
343 int ret;
345 ret = ib_query_qp(priv->qp, &qp_attr, IB_QP_STATE, &query_init_attr);
346 if (ret) {
347 ipoib_warn(priv, "%s: Failed to query QP ret: %d\n",
348 __func__, ret);
349 goto free_res;
351 pr_info("%s: QP: 0x%x is in state: %d\n",
352 __func__, priv->qp->qp_num, qp_attr.qp_state);
354 /* currently support only in SQE->RTS transition*/
355 if (qp_attr.qp_state == IB_QPS_SQE) {
356 qp_attr.qp_state = IB_QPS_RTS;
358 ret = ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE);
359 if (ret) {
360 pr_warn("failed(%d) modify QP:0x%x SQE->RTS\n",
361 ret, priv->qp->qp_num);
362 goto free_res;
364 pr_info("%s: QP: 0x%x moved from IB_QPS_SQE to IB_QPS_RTS\n",
365 __func__, priv->qp->qp_num);
366 } else {
367 pr_warn("QP (%d) will stay in state: %d\n",
368 priv->qp->qp_num, qp_attr.qp_state);
371 free_res:
372 kfree(qp_work);
375 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
377 struct ipoib_dev_priv *priv = netdev_priv(dev);
378 unsigned int wr_id = wc->wr_id;
379 struct ipoib_tx_buf *tx_req;
381 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
382 wr_id, wc->status);
384 if (unlikely(wr_id >= ipoib_sendq_size)) {
385 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
386 wr_id, ipoib_sendq_size);
387 return;
390 tx_req = &priv->tx_ring[wr_id];
392 ipoib_dma_unmap_tx(priv, tx_req);
394 ++dev->stats.tx_packets;
395 dev->stats.tx_bytes += tx_req->skb->len;
397 dev_kfree_skb_any(tx_req->skb);
399 ++priv->tx_tail;
400 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
401 netif_queue_stopped(dev) &&
402 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
403 netif_wake_queue(dev);
405 if (wc->status != IB_WC_SUCCESS &&
406 wc->status != IB_WC_WR_FLUSH_ERR) {
407 struct ipoib_qp_state_validate *qp_work;
408 ipoib_warn(priv, "failed send event "
409 "(status=%d, wrid=%d vend_err %x)\n",
410 wc->status, wr_id, wc->vendor_err);
411 qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC);
412 if (!qp_work) {
413 ipoib_warn(priv, "%s Failed alloc ipoib_qp_state_validate for qp: 0x%x\n",
414 __func__, priv->qp->qp_num);
415 return;
418 INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work);
419 qp_work->priv = priv;
420 queue_work(priv->wq, &qp_work->work);
424 static int poll_tx(struct ipoib_dev_priv *priv)
426 int n, i;
428 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
429 for (i = 0; i < n; ++i)
430 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
432 return n == MAX_SEND_CQE;
435 int ipoib_poll(struct napi_struct *napi, int budget)
437 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
438 struct net_device *dev = priv->dev;
439 int done;
440 int t;
441 int n, i;
443 done = 0;
445 poll_more:
446 while (done < budget) {
447 int max = (budget - done);
449 t = min(IPOIB_NUM_WC, max);
450 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
452 for (i = 0; i < n; i++) {
453 struct ib_wc *wc = priv->ibwc + i;
455 if (wc->wr_id & IPOIB_OP_RECV) {
456 ++done;
457 if (wc->wr_id & IPOIB_OP_CM)
458 ipoib_cm_handle_rx_wc(dev, wc);
459 else
460 ipoib_ib_handle_rx_wc(dev, wc);
461 } else
462 ipoib_cm_handle_tx_wc(priv->dev, wc);
465 if (n != t)
466 break;
469 if (done < budget) {
470 napi_complete(napi);
471 if (unlikely(ib_req_notify_cq(priv->recv_cq,
472 IB_CQ_NEXT_COMP |
473 IB_CQ_REPORT_MISSED_EVENTS)) &&
474 napi_reschedule(napi))
475 goto poll_more;
478 return done;
481 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
483 struct net_device *dev = dev_ptr;
484 struct ipoib_dev_priv *priv = netdev_priv(dev);
486 napi_schedule(&priv->napi);
489 static void drain_tx_cq(struct net_device *dev)
491 struct ipoib_dev_priv *priv = netdev_priv(dev);
493 netif_tx_lock(dev);
494 while (poll_tx(priv))
495 ; /* nothing */
497 if (netif_queue_stopped(dev))
498 mod_timer(&priv->poll_timer, jiffies + 1);
500 netif_tx_unlock(dev);
503 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
505 struct ipoib_dev_priv *priv = netdev_priv(dev_ptr);
507 mod_timer(&priv->poll_timer, jiffies);
510 static inline int post_send(struct ipoib_dev_priv *priv,
511 unsigned int wr_id,
512 struct ib_ah *address, u32 qpn,
513 struct ipoib_tx_buf *tx_req,
514 void *head, int hlen)
516 struct ib_send_wr *bad_wr;
517 struct sk_buff *skb = tx_req->skb;
519 ipoib_build_sge(priv, tx_req);
521 priv->tx_wr.wr_id = wr_id;
522 priv->tx_wr.wr.ud.remote_qpn = qpn;
523 priv->tx_wr.wr.ud.ah = address;
525 if (head) {
526 priv->tx_wr.wr.ud.mss = skb_shinfo(skb)->gso_size;
527 priv->tx_wr.wr.ud.header = head;
528 priv->tx_wr.wr.ud.hlen = hlen;
529 priv->tx_wr.opcode = IB_WR_LSO;
530 } else
531 priv->tx_wr.opcode = IB_WR_SEND;
533 return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
536 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
537 struct ipoib_ah *address, u32 qpn)
539 struct ipoib_dev_priv *priv = netdev_priv(dev);
540 struct ipoib_tx_buf *tx_req;
541 int hlen, rc;
542 void *phead;
544 if (skb_is_gso(skb)) {
545 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
546 phead = skb->data;
547 if (unlikely(!skb_pull(skb, hlen))) {
548 ipoib_warn(priv, "linear data too small\n");
549 ++dev->stats.tx_dropped;
550 ++dev->stats.tx_errors;
551 dev_kfree_skb_any(skb);
552 return;
554 } else {
555 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
556 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
557 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
558 ++dev->stats.tx_dropped;
559 ++dev->stats.tx_errors;
560 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
561 return;
563 phead = NULL;
564 hlen = 0;
567 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
568 skb->len, address, qpn);
571 * We put the skb into the tx_ring _before_ we call post_send()
572 * because it's entirely possible that the completion handler will
573 * run before we execute anything after the post_send(). That
574 * means we have to make sure everything is properly recorded and
575 * our state is consistent before we call post_send().
577 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
578 tx_req->skb = skb;
579 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
580 ++dev->stats.tx_errors;
581 dev_kfree_skb_any(skb);
582 return;
585 if (skb->ip_summed == CHECKSUM_PARTIAL)
586 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
587 else
588 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
590 if (++priv->tx_outstanding == ipoib_sendq_size) {
591 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
592 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
593 ipoib_warn(priv, "request notify on send CQ failed\n");
594 netif_stop_queue(dev);
597 skb_orphan(skb);
598 skb_dst_drop(skb);
600 rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
601 address->ah, qpn, tx_req, phead, hlen);
602 if (unlikely(rc)) {
603 ipoib_warn(priv, "post_send failed, error %d\n", rc);
604 ++dev->stats.tx_errors;
605 --priv->tx_outstanding;
606 ipoib_dma_unmap_tx(priv, tx_req);
607 dev_kfree_skb_any(skb);
608 if (netif_queue_stopped(dev))
609 netif_wake_queue(dev);
610 } else {
611 dev->trans_start = jiffies;
613 address->last_send = priv->tx_head;
614 ++priv->tx_head;
617 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
618 while (poll_tx(priv))
619 ; /* nothing */
622 static void __ipoib_reap_ah(struct net_device *dev)
624 struct ipoib_dev_priv *priv = netdev_priv(dev);
625 struct ipoib_ah *ah, *tah;
626 LIST_HEAD(remove_list);
627 unsigned long flags;
629 netif_tx_lock_bh(dev);
630 spin_lock_irqsave(&priv->lock, flags);
632 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
633 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
634 list_del(&ah->list);
635 ib_destroy_ah(ah->ah);
636 kfree(ah);
639 spin_unlock_irqrestore(&priv->lock, flags);
640 netif_tx_unlock_bh(dev);
643 void ipoib_reap_ah(struct work_struct *work)
645 struct ipoib_dev_priv *priv =
646 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
647 struct net_device *dev = priv->dev;
649 __ipoib_reap_ah(dev);
651 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
652 queue_delayed_work(priv->wq, &priv->ah_reap_task,
653 round_jiffies_relative(HZ));
656 static void ipoib_flush_ah(struct net_device *dev)
658 struct ipoib_dev_priv *priv = netdev_priv(dev);
660 cancel_delayed_work(&priv->ah_reap_task);
661 flush_workqueue(priv->wq);
662 ipoib_reap_ah(&priv->ah_reap_task.work);
665 static void ipoib_stop_ah(struct net_device *dev)
667 struct ipoib_dev_priv *priv = netdev_priv(dev);
669 set_bit(IPOIB_STOP_REAPER, &priv->flags);
670 ipoib_flush_ah(dev);
673 static void ipoib_ib_tx_timer_func(unsigned long ctx)
675 drain_tx_cq((struct net_device *)ctx);
678 int ipoib_ib_dev_open(struct net_device *dev)
680 struct ipoib_dev_priv *priv = netdev_priv(dev);
681 int ret;
683 ipoib_pkey_dev_check_presence(dev);
685 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
686 ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey,
687 (!(priv->pkey & 0x7fff) ? "Invalid" : "not found"));
688 return -1;
691 ret = ipoib_init_qp(dev);
692 if (ret) {
693 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
694 return -1;
697 ret = ipoib_ib_post_receives(dev);
698 if (ret) {
699 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
700 goto dev_stop;
703 ret = ipoib_cm_dev_open(dev);
704 if (ret) {
705 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
706 goto dev_stop;
709 clear_bit(IPOIB_STOP_REAPER, &priv->flags);
710 queue_delayed_work(priv->wq, &priv->ah_reap_task,
711 round_jiffies_relative(HZ));
713 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
714 napi_enable(&priv->napi);
716 return 0;
717 dev_stop:
718 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
719 napi_enable(&priv->napi);
720 ipoib_ib_dev_stop(dev);
721 return -1;
724 void ipoib_pkey_dev_check_presence(struct net_device *dev)
726 struct ipoib_dev_priv *priv = netdev_priv(dev);
728 if (!(priv->pkey & 0x7fff) ||
729 ib_find_pkey(priv->ca, priv->port, priv->pkey,
730 &priv->pkey_index))
731 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
732 else
733 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
736 int ipoib_ib_dev_up(struct net_device *dev)
738 struct ipoib_dev_priv *priv = netdev_priv(dev);
740 ipoib_pkey_dev_check_presence(dev);
742 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
743 ipoib_dbg(priv, "PKEY is not assigned.\n");
744 return 0;
747 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
749 return ipoib_mcast_start_thread(dev);
752 int ipoib_ib_dev_down(struct net_device *dev)
754 struct ipoib_dev_priv *priv = netdev_priv(dev);
756 ipoib_dbg(priv, "downing ib_dev\n");
758 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
759 netif_carrier_off(dev);
761 ipoib_mcast_stop_thread(dev);
762 ipoib_mcast_dev_flush(dev);
764 ipoib_flush_paths(dev);
766 return 0;
769 static int recvs_pending(struct net_device *dev)
771 struct ipoib_dev_priv *priv = netdev_priv(dev);
772 int pending = 0;
773 int i;
775 for (i = 0; i < ipoib_recvq_size; ++i)
776 if (priv->rx_ring[i].skb)
777 ++pending;
779 return pending;
782 void ipoib_drain_cq(struct net_device *dev)
784 struct ipoib_dev_priv *priv = netdev_priv(dev);
785 int i, n;
788 * We call completion handling routines that expect to be
789 * called from the BH-disabled NAPI poll context, so disable
790 * BHs here too.
792 local_bh_disable();
794 do {
795 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
796 for (i = 0; i < n; ++i) {
798 * Convert any successful completions to flush
799 * errors to avoid passing packets up the
800 * stack after bringing the device down.
802 if (priv->ibwc[i].status == IB_WC_SUCCESS)
803 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
805 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
806 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
807 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
808 else
809 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
810 } else
811 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
813 } while (n == IPOIB_NUM_WC);
815 while (poll_tx(priv))
816 ; /* nothing */
818 local_bh_enable();
821 int ipoib_ib_dev_stop(struct net_device *dev)
823 struct ipoib_dev_priv *priv = netdev_priv(dev);
824 struct ib_qp_attr qp_attr;
825 unsigned long begin;
826 struct ipoib_tx_buf *tx_req;
827 int i;
829 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
830 napi_disable(&priv->napi);
832 ipoib_cm_dev_stop(dev);
835 * Move our QP to the error state and then reinitialize in
836 * when all work requests have completed or have been flushed.
838 qp_attr.qp_state = IB_QPS_ERR;
839 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
840 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
842 /* Wait for all sends and receives to complete */
843 begin = jiffies;
845 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
846 if (time_after(jiffies, begin + 5 * HZ)) {
847 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
848 priv->tx_head - priv->tx_tail, recvs_pending(dev));
851 * assume the HW is wedged and just free up
852 * all our pending work requests.
854 while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
855 tx_req = &priv->tx_ring[priv->tx_tail &
856 (ipoib_sendq_size - 1)];
857 ipoib_dma_unmap_tx(priv, tx_req);
858 dev_kfree_skb_any(tx_req->skb);
859 ++priv->tx_tail;
860 --priv->tx_outstanding;
863 for (i = 0; i < ipoib_recvq_size; ++i) {
864 struct ipoib_rx_buf *rx_req;
866 rx_req = &priv->rx_ring[i];
867 if (!rx_req->skb)
868 continue;
869 ipoib_ud_dma_unmap_rx(priv,
870 priv->rx_ring[i].mapping);
871 dev_kfree_skb_any(rx_req->skb);
872 rx_req->skb = NULL;
875 goto timeout;
878 ipoib_drain_cq(dev);
880 msleep(1);
883 ipoib_dbg(priv, "All sends and receives done.\n");
885 timeout:
886 del_timer_sync(&priv->poll_timer);
887 qp_attr.qp_state = IB_QPS_RESET;
888 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
889 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
891 ipoib_flush_ah(dev);
893 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
895 return 0;
898 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
900 struct ipoib_dev_priv *priv = netdev_priv(dev);
902 priv->ca = ca;
903 priv->port = port;
904 priv->qp = NULL;
906 if (ipoib_transport_dev_init(dev, ca)) {
907 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
908 return -ENODEV;
911 setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
912 (unsigned long) dev);
914 if (dev->flags & IFF_UP) {
915 if (ipoib_ib_dev_open(dev)) {
916 ipoib_transport_dev_cleanup(dev);
917 return -ENODEV;
921 return 0;
925 * Takes whatever value which is in pkey index 0 and updates priv->pkey
926 * returns 0 if the pkey value was changed.
928 static inline int update_parent_pkey(struct ipoib_dev_priv *priv)
930 int result;
931 u16 prev_pkey;
933 prev_pkey = priv->pkey;
934 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
935 if (result) {
936 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n",
937 priv->port, result);
938 return result;
941 priv->pkey |= 0x8000;
943 if (prev_pkey != priv->pkey) {
944 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n",
945 prev_pkey, priv->pkey);
947 * Update the pkey in the broadcast address, while making sure to set
948 * the full membership bit, so that we join the right broadcast group.
950 priv->dev->broadcast[8] = priv->pkey >> 8;
951 priv->dev->broadcast[9] = priv->pkey & 0xff;
952 return 0;
955 return 1;
958 * returns 0 if pkey value was found in a different slot.
960 static inline int update_child_pkey(struct ipoib_dev_priv *priv)
962 u16 old_index = priv->pkey_index;
964 priv->pkey_index = 0;
965 ipoib_pkey_dev_check_presence(priv->dev);
967 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
968 (old_index == priv->pkey_index))
969 return 1;
970 return 0;
973 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
974 enum ipoib_flush_level level,
975 int nesting)
977 struct ipoib_dev_priv *cpriv;
978 struct net_device *dev = priv->dev;
979 int result;
981 down_read_nested(&priv->vlan_rwsem, nesting);
984 * Flush any child interfaces too -- they might be up even if
985 * the parent is down.
987 list_for_each_entry(cpriv, &priv->child_intfs, list)
988 __ipoib_ib_dev_flush(cpriv, level, nesting + 1);
990 up_read(&priv->vlan_rwsem);
992 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) &&
993 level != IPOIB_FLUSH_HEAVY) {
994 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
995 return;
998 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
999 /* interface is down. update pkey and leave. */
1000 if (level == IPOIB_FLUSH_HEAVY) {
1001 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1002 update_parent_pkey(priv);
1003 else
1004 update_child_pkey(priv);
1006 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
1007 return;
1010 if (level == IPOIB_FLUSH_HEAVY) {
1011 /* child devices chase their origin pkey value, while non-child
1012 * (parent) devices should always takes what present in pkey index 0
1014 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
1015 result = update_child_pkey(priv);
1016 if (result) {
1017 /* restart QP only if P_Key index is changed */
1018 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
1019 return;
1022 } else {
1023 result = update_parent_pkey(priv);
1024 /* restart QP only if P_Key value changed */
1025 if (result) {
1026 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n");
1027 return;
1032 if (level == IPOIB_FLUSH_LIGHT) {
1033 ipoib_mark_paths_invalid(dev);
1034 ipoib_mcast_dev_flush(dev);
1035 ipoib_flush_ah(dev);
1038 if (level >= IPOIB_FLUSH_NORMAL)
1039 ipoib_ib_dev_down(dev);
1041 if (level == IPOIB_FLUSH_HEAVY) {
1042 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
1043 ipoib_ib_dev_stop(dev);
1044 if (ipoib_ib_dev_open(dev) != 0)
1045 return;
1046 if (netif_queue_stopped(dev))
1047 netif_start_queue(dev);
1051 * The device could have been brought down between the start and when
1052 * we get here, don't bring it back up if it's not configured up
1054 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1055 if (level >= IPOIB_FLUSH_NORMAL)
1056 ipoib_ib_dev_up(dev);
1057 ipoib_mcast_restart_task(&priv->restart_task);
1061 void ipoib_ib_dev_flush_light(struct work_struct *work)
1063 struct ipoib_dev_priv *priv =
1064 container_of(work, struct ipoib_dev_priv, flush_light);
1066 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0);
1069 void ipoib_ib_dev_flush_normal(struct work_struct *work)
1071 struct ipoib_dev_priv *priv =
1072 container_of(work, struct ipoib_dev_priv, flush_normal);
1074 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0);
1077 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1079 struct ipoib_dev_priv *priv =
1080 container_of(work, struct ipoib_dev_priv, flush_heavy);
1082 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0);
1085 void ipoib_ib_dev_cleanup(struct net_device *dev)
1087 struct ipoib_dev_priv *priv = netdev_priv(dev);
1089 ipoib_dbg(priv, "cleaning up ib_dev\n");
1091 * We must make sure there are no more (path) completions
1092 * that may wish to touch priv fields that are no longer valid
1094 ipoib_flush_paths(dev);
1096 ipoib_mcast_stop_thread(dev);
1097 ipoib_mcast_dev_flush(dev);
1100 * All of our ah references aren't free until after
1101 * ipoib_mcast_dev_flush(), ipoib_flush_paths, and
1102 * the neighbor garbage collection is stopped and reaped.
1103 * That should all be done now, so make a final ah flush.
1105 ipoib_stop_ah(dev);
1107 ipoib_transport_dev_cleanup(dev);